CA1221918A - Atmosphere control arrangement for an operator enclosure - Google Patents
Atmosphere control arrangement for an operator enclosureInfo
- Publication number
- CA1221918A CA1221918A CA000452292A CA452292A CA1221918A CA 1221918 A CA1221918 A CA 1221918A CA 000452292 A CA000452292 A CA 000452292A CA 452292 A CA452292 A CA 452292A CA 1221918 A CA1221918 A CA 1221918A
- Authority
- CA
- Canada
- Prior art keywords
- air
- enclosure
- precleaner
- filter
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
- B60H3/06—Filtering
- B60H3/0608—Filter arrangements in the air stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00378—Air-conditioning arrangements specially adapted for particular vehicles for tractor or load vehicle cabins
Abstract
ATMOSPHERE CONTROL ARRANGEMENT FOR AN OPERATOR ENCLOSURE
Abstract of the Disclosure An atmosphere control system for the cab of a self-propelled combine has its principal components arranged for series flow and mounted compactly on a rear portion of the floor of the cab. A pressurizing blower injects fresh air into an upstream filter chamber through a translational inertial precleaner which discharges any removed dust along with bleed air vertically downwards through the floor of the cab. A filter further cleans fresh air as it continues into the system, to pass through a heat exchanger and into circulation by a circulation blower and suitable ducting. Both precleaner and fresh air filter are accessible through a door in an outside wall of the cab.
Abstract of the Disclosure An atmosphere control system for the cab of a self-propelled combine has its principal components arranged for series flow and mounted compactly on a rear portion of the floor of the cab. A pressurizing blower injects fresh air into an upstream filter chamber through a translational inertial precleaner which discharges any removed dust along with bleed air vertically downwards through the floor of the cab. A filter further cleans fresh air as it continues into the system, to pass through a heat exchanger and into circulation by a circulation blower and suitable ducting. Both precleaner and fresh air filter are accessible through a door in an outside wall of the cab.
Description
1 ATMOSPH~RE CONT~OL ARRANGEMENT FOR AN OPERATOR ENCLOSU~E
Backgro~nd of the Inv _ io This invention concerns control oE the atmosphere in an operator enclosure of a self-propelled vehicle and, more particularly, the arrangement and combination of components within the enclosure of an off-the-road vehicle exposed to heavy concentrations of airborne dust and debris.
Concern for aperator safety and comfort leads to the development of increasingly sophisticated operator enclosures (which, however, are still generally referred to as cabs). It is well-known that modern cab design deals not only with ergonomic considerations but also with the more passive environmental factors such as roll-over protection, isolation from noise and preservation of a comfortable and clean 15 atmosphere. The present invention is concerned principally with the latter b~t improvement of atmosphere control in cabs is clearly most advantageous~y used in an operator station or enclosure in which other comfort and safety considerations have been adeguately provided for. It is well-known, in a completely 20 enclosed cab, to provide an atmosphere control system which takes in and filters outside air, heats or cools the air as required, and circulates it in the cab while maintaining pressure in the cab slightly above atmospheric, so as to discourage the entry of dust or other contaminants through, for 25 example, imperfectly sealed doors or windows. Efforts are still being made to improve the efficiency, serviceability and compactness of s~ch systems. Means are sometimes provided for precleaning the intake air but typically precleaners are remote from the main components of the system and ~nsightly and fitted 30 as an attachment or add-on rather than integrated into the system.
Summary of the Invention Accordingly, it is an object of the invention to provide for the operator enclosure of an off-the-road self-propelled 35 vehicle, such as an agricultural tractor or combine, an atmosphere control arrangement which is compact, convenient to assemble, service and repair, and which is efficient in operation.
It is a feature of the invention to arrange all principal 40 components in series with a view to efficiency in operation and ~2~
simplicity o~ housing and ductin~ the components. In a preferred embodiment, there is a single (preferably elevated) inlet for fresh air intake and essentially a single outlet for circulating and pre~surizing air combined. The system sequence is as follows: fresh air inlet, pressurizing blower, precleaner, fresh air filter, heat exchanger, circ~lating blower. Features which modify the simple series arrangement may include the precleaner being of the inertial (preferably t~anslational) type in which case dust or dirt extracted is 10 exhausted or ejected to atmosphere while the bulk of inlet air passes on to the fresh air filter. Another modifying feature may be the provision of a filtered inlet for admitting recirculated air into the system, upstream of the heat exchanger. Preferably the outflow of combined circulating and 15 pressurizing air from the circulating blower will be distributed appropriately in the enclosure by suitable ducting. It will be understood that the incoming fresh air delivered by the pressurizing blower functions not only to maintain a positive pressure within the enclosure but also to make up air 20 intentionally lost through "leaks" in the enclosure. Make-up air is required to maintain an acceptable level of air quality.
The simplicity of the series arrangement of components facilitates the provision of a split housing for the components comprising principally upper and lower halves mating or meeting 25 at a generally horizontal parting line. The lower half may be seated on the floor of the operator enclosure and may include molded forms for positioning and support of components such as the heat exchanger and recirculating air filter and precleaner, final completion of assembly and retention of components in 30 place being made by placing the upper casing half in position.
It is a feature of the invention that a generally upstream compartment of the housing, defined locally by internally projecting portions of the upper and lower casing halves, may contain the precleaner and have, in one of its walls, an 35 aperture covered by the main fresh air filter of the system.
Preferably this filter compartment includes a wall adjacent or coincident with an external wall of the operator enclosure thus facilitating service access to the filter compartment.
Preferably, molded and vertically aligned features in the upper 40 and lower portions of the casing respectively receive and hold 3~
1 the precleaner with its inlet ancl bleed air outlet registering with opposite apertures in the casing. Thus the principal axis of air flow in the precleaner is vertically aligned and a dust and dirt outlet is readily provided in the floor of the operator enclosure. Preferably the pressurizing blower has an air delivery outlet directed downwards and communicating directly with the precleaner so that charging of the precleaner is direct and efficient.
Other objects and advantages of the invention will become 0 apparent from reading the description which follows.
Brief Description of the Drawings Fig. 1 is a left-hand side elevation of an operator enclosure embodying the invention.
Fig. 2 is a simplified schematic of the atmosphere control 15 system based on a rear view of the operator enclosure of Fig.
1. The spatial relationship of components have been modified somewhat to simplify this representation of their functional relationships.
Fig. 3 is an enlarged overhead view of the rearward lower 20 portion of the operator enclosure showing the general arrangement of the system within the enclosure.
Fig. 4 is a partial, generally front view approximately on line 4--4 of Fig. 3.
Fig. 5 is a partial rear view approximately on line 5 -5 of 25 Fig. 3 showing the pressurizing blower and precleaner.
Fig. 6 is a view approximately on line 6--6 of Fig. 5.
Description of the Preferred Embodiment The invention is embodied in the operator's station and enclosure of a self-propelled combine harvester shown in Fig.
3o 1.
The enclosure is generally rectangular in shape and includes a floor 10, rear wall 12, opposite side walls 14 and a roof 16.
There is an access door 18 in the left-hand side wall 14. The operator station includes a seat 20 supported on a seat pedestal 35 22, a steering column 24 and various controls and equipment not shown in the drawing.
The general disposition of the enclosure atmosphere control system 30 is indicated in Fig. 1. The bulk of the system is supported on the floor 10 of the enclosure close to the rear 40 wall 12. Clean make-up air for the system enters through i louvers 32 in the roof 16 into a plenum 34 and thence by a duct 36 extending vertically downwards close to the rear left-hand corner of the enclosure, to broaden into a blower plenum area 38 immediately above the atmosphere control system 30.
The sequential and functional relationship of the principal components of the atmosphere control system are shown schematically in Fig. 2. This drawing is semi-pictorial but the orientation and disposition of some of the components has been changed somewhat for clarity. Casing 40 essentially houses all 10 the main components including a pressurizing blower 42, precleaner 44, fresh air filter 46, heat exchanger 48, recirculating blower 50 and connects with distribution ducting 52. The heat exchanger 48 includes an evaporator (air conditioning) 54, a heater coil 56 and an adjustable air 15 deflector or baffle 58. Recirculating air is admitted to the casing 40 through a recirculating air filter 60 into an air mixing chamber 62, downstream of the fresh air filter 46.
Figs. 3 and 4 show the actual configuration of the system, supported on the floor 10 of the cab in the left-hand rear 20 corner immediately to the left of the operator seat 20. As can be seen, the principal components, fresh air filter 46, heat exchanger components 48 and the recirculating blower 50 are substantially coaxial and the longitudinal axis of the system extends approximately diagonally with respect to the floor 10 of 25 the cab.
Figs. 3 and 4 particularly illustrate the compactness of the system and indicate the convenience and simplicity of assembly and service provided by the generally horizontaliy split or divided casing 40 which consists essentially of upper and lower 30 portions 64 and 66, respectively, meeting at a flanged and bolted joint 68. The lower portion 66 is mounted on the floor of the cab by suitable fasteners (not shown) and, in common with the upper portion 64, it has appropriate recesses suitably molded to position and support the various components of the 35 system. An example is the support of evaporator 54 in recesses 65 and 65a (Fig. 4).
In assembly, internal flange-like members define a transverse wall 70 with a through aperture 72 for mounting the cylinder-type fresh air filter 46. The internal space of the 40 casing upstream of the wall 70 will be referred to as a filter ~2~
1 chamber 74. The precleaner 44 also extends vertically through it, immediately rearward of the fresh air filter 46. The upstream end of the casing 40 connects with the left-hand side wall 14 and an access door 76 provides convenient access from outside of the cab to the filter chamber 74~
The precleaner 44, seen best in Figs. 5 and 6, is of the translational inertial type, the general principles of which are described in Society of Automotive Engineers paper 880B, "High Performance Air Cleaners for the ~rmy's Industrial Gas Turbines"
10 presented in 1964 (see especially pages 3-6). It is positioned by and supported between a pressurizing blower nozzle or outlet 80, molded into the upper casing portion 64, and an open recess 82 molded into the floor of the lower casing portion 66~ The precleaner 44 is essentially a tapered passage of rectangular 15 cross section in which opposite body walls 84 are louvered, with louvers 86 extending laterally and defining a series of upwardly and outwardly directed slots 88. A top transitional portion 90 connects with the pressurizing blower 80 and an exit slot 92 connects with a downwardly directed outlet 94 in the recess 82 20 in the floor 10 of the cab. The lower outlet end of the precleaner 44 is supported in the recess 82 on a resilient gasket or grommet 96. This serves as a compression "spring"
permitting insertion of the precleaner 44 and holding it in place, with a collar 98 engaging the blower nozzle 80. It is 25 thus conveniently removable for service or replacement.
In operation, the cab door 18 is closed and pressurizing blower switched on drawing outside air in through the roof louvers 32. These louvers screen out larger pieces of airborne trash, leaves, etc., but, typically, dust-laden air enters and 30 is delivered downwards, "charging" the precleaner 44. The way in which translational inertial precleaners operate is well-known. The relatively high axial air velocity developed carries dust and dirt downwards at such velocity that the particles have sufficient inertiz to resist the deflection and near reversal of 35 direction it would require to pass through the slots 88. The tapered form of the precleaner helps maintain the air velocity and also develops a static pressure so that much of the air delivered by the blower 42 passes through the louvered slots 88 into the filter chamber 74. In a typical precleaner of this 40 type, about 15 percent of the initial flow of air is lost or l8 bled. In this embodiment it exits vertical~y downwards through the slot 92 and outlet 94 in the floor 10 of the cab taking with it 80 to 95 percent of the dust which had been entrained in the incoming air.
As is conventional the cab structure is designed to "leak"
at a rate which requires a make-up air flow sufficient to maintain air quality in the cab at an acceptable level.
Normally, the pressurizing blower 42, preferably of the constant volume type, runs continuously when the combine is operated with 10 the cab closed. When the recirculating blower 50, preferably variable speed, is also in operation, air from inside the cab is drawn through the recirculating filter 60 to mix with fresh or make-up air passing from the filter chamber 74 through the fresh air filter 46 into the mixing chamber 62. The combined air then 15 passes through heat exchanger ~8 and is conditioned (heated or cooled and possibly dehumidified) according to setting of conventional controls (not shown). Conditioned air is then distributed appropriately in the cab by the distribution duct 52.
Among advantageous features of an operator enclosure atmosphere conditioning system according to the invention, and evident from the drawings and above description are the compact space saving and functionally efficient disposition and layout of the principal components. The "in-series" arrangement of 25 principal components means that all air is drawn through the system with minimum pressure loss and turbulence. The unobtrusive integration of the precleaner 44 achieved by placing it alongside the fresh air filter 46 in the filter chamber 74 enhances the convenience of the location of the main fresh air 30 filter 46. Both the filter and precleaner may be inspected or serviced conveniently through a single acc~ess door 76. The inconvenience of the typically bulky and unsightly external precleaner is avoided. Here, it is completely concealed and is self-cleaning, and its location is such that dust and dirt 35 extracted by it is discharged downwards relatively close to the ground with a reduced possibility of fouling other parts of the combine.
Backgro~nd of the Inv _ io This invention concerns control oE the atmosphere in an operator enclosure of a self-propelled vehicle and, more particularly, the arrangement and combination of components within the enclosure of an off-the-road vehicle exposed to heavy concentrations of airborne dust and debris.
Concern for aperator safety and comfort leads to the development of increasingly sophisticated operator enclosures (which, however, are still generally referred to as cabs). It is well-known that modern cab design deals not only with ergonomic considerations but also with the more passive environmental factors such as roll-over protection, isolation from noise and preservation of a comfortable and clean 15 atmosphere. The present invention is concerned principally with the latter b~t improvement of atmosphere control in cabs is clearly most advantageous~y used in an operator station or enclosure in which other comfort and safety considerations have been adeguately provided for. It is well-known, in a completely 20 enclosed cab, to provide an atmosphere control system which takes in and filters outside air, heats or cools the air as required, and circulates it in the cab while maintaining pressure in the cab slightly above atmospheric, so as to discourage the entry of dust or other contaminants through, for 25 example, imperfectly sealed doors or windows. Efforts are still being made to improve the efficiency, serviceability and compactness of s~ch systems. Means are sometimes provided for precleaning the intake air but typically precleaners are remote from the main components of the system and ~nsightly and fitted 30 as an attachment or add-on rather than integrated into the system.
Summary of the Invention Accordingly, it is an object of the invention to provide for the operator enclosure of an off-the-road self-propelled 35 vehicle, such as an agricultural tractor or combine, an atmosphere control arrangement which is compact, convenient to assemble, service and repair, and which is efficient in operation.
It is a feature of the invention to arrange all principal 40 components in series with a view to efficiency in operation and ~2~
simplicity o~ housing and ductin~ the components. In a preferred embodiment, there is a single (preferably elevated) inlet for fresh air intake and essentially a single outlet for circulating and pre~surizing air combined. The system sequence is as follows: fresh air inlet, pressurizing blower, precleaner, fresh air filter, heat exchanger, circ~lating blower. Features which modify the simple series arrangement may include the precleaner being of the inertial (preferably t~anslational) type in which case dust or dirt extracted is 10 exhausted or ejected to atmosphere while the bulk of inlet air passes on to the fresh air filter. Another modifying feature may be the provision of a filtered inlet for admitting recirculated air into the system, upstream of the heat exchanger. Preferably the outflow of combined circulating and 15 pressurizing air from the circulating blower will be distributed appropriately in the enclosure by suitable ducting. It will be understood that the incoming fresh air delivered by the pressurizing blower functions not only to maintain a positive pressure within the enclosure but also to make up air 20 intentionally lost through "leaks" in the enclosure. Make-up air is required to maintain an acceptable level of air quality.
The simplicity of the series arrangement of components facilitates the provision of a split housing for the components comprising principally upper and lower halves mating or meeting 25 at a generally horizontal parting line. The lower half may be seated on the floor of the operator enclosure and may include molded forms for positioning and support of components such as the heat exchanger and recirculating air filter and precleaner, final completion of assembly and retention of components in 30 place being made by placing the upper casing half in position.
It is a feature of the invention that a generally upstream compartment of the housing, defined locally by internally projecting portions of the upper and lower casing halves, may contain the precleaner and have, in one of its walls, an 35 aperture covered by the main fresh air filter of the system.
Preferably this filter compartment includes a wall adjacent or coincident with an external wall of the operator enclosure thus facilitating service access to the filter compartment.
Preferably, molded and vertically aligned features in the upper 40 and lower portions of the casing respectively receive and hold 3~
1 the precleaner with its inlet ancl bleed air outlet registering with opposite apertures in the casing. Thus the principal axis of air flow in the precleaner is vertically aligned and a dust and dirt outlet is readily provided in the floor of the operator enclosure. Preferably the pressurizing blower has an air delivery outlet directed downwards and communicating directly with the precleaner so that charging of the precleaner is direct and efficient.
Other objects and advantages of the invention will become 0 apparent from reading the description which follows.
Brief Description of the Drawings Fig. 1 is a left-hand side elevation of an operator enclosure embodying the invention.
Fig. 2 is a simplified schematic of the atmosphere control 15 system based on a rear view of the operator enclosure of Fig.
1. The spatial relationship of components have been modified somewhat to simplify this representation of their functional relationships.
Fig. 3 is an enlarged overhead view of the rearward lower 20 portion of the operator enclosure showing the general arrangement of the system within the enclosure.
Fig. 4 is a partial, generally front view approximately on line 4--4 of Fig. 3.
Fig. 5 is a partial rear view approximately on line 5 -5 of 25 Fig. 3 showing the pressurizing blower and precleaner.
Fig. 6 is a view approximately on line 6--6 of Fig. 5.
Description of the Preferred Embodiment The invention is embodied in the operator's station and enclosure of a self-propelled combine harvester shown in Fig.
3o 1.
The enclosure is generally rectangular in shape and includes a floor 10, rear wall 12, opposite side walls 14 and a roof 16.
There is an access door 18 in the left-hand side wall 14. The operator station includes a seat 20 supported on a seat pedestal 35 22, a steering column 24 and various controls and equipment not shown in the drawing.
The general disposition of the enclosure atmosphere control system 30 is indicated in Fig. 1. The bulk of the system is supported on the floor 10 of the enclosure close to the rear 40 wall 12. Clean make-up air for the system enters through i louvers 32 in the roof 16 into a plenum 34 and thence by a duct 36 extending vertically downwards close to the rear left-hand corner of the enclosure, to broaden into a blower plenum area 38 immediately above the atmosphere control system 30.
The sequential and functional relationship of the principal components of the atmosphere control system are shown schematically in Fig. 2. This drawing is semi-pictorial but the orientation and disposition of some of the components has been changed somewhat for clarity. Casing 40 essentially houses all 10 the main components including a pressurizing blower 42, precleaner 44, fresh air filter 46, heat exchanger 48, recirculating blower 50 and connects with distribution ducting 52. The heat exchanger 48 includes an evaporator (air conditioning) 54, a heater coil 56 and an adjustable air 15 deflector or baffle 58. Recirculating air is admitted to the casing 40 through a recirculating air filter 60 into an air mixing chamber 62, downstream of the fresh air filter 46.
Figs. 3 and 4 show the actual configuration of the system, supported on the floor 10 of the cab in the left-hand rear 20 corner immediately to the left of the operator seat 20. As can be seen, the principal components, fresh air filter 46, heat exchanger components 48 and the recirculating blower 50 are substantially coaxial and the longitudinal axis of the system extends approximately diagonally with respect to the floor 10 of 25 the cab.
Figs. 3 and 4 particularly illustrate the compactness of the system and indicate the convenience and simplicity of assembly and service provided by the generally horizontaliy split or divided casing 40 which consists essentially of upper and lower 30 portions 64 and 66, respectively, meeting at a flanged and bolted joint 68. The lower portion 66 is mounted on the floor of the cab by suitable fasteners (not shown) and, in common with the upper portion 64, it has appropriate recesses suitably molded to position and support the various components of the 35 system. An example is the support of evaporator 54 in recesses 65 and 65a (Fig. 4).
In assembly, internal flange-like members define a transverse wall 70 with a through aperture 72 for mounting the cylinder-type fresh air filter 46. The internal space of the 40 casing upstream of the wall 70 will be referred to as a filter ~2~
1 chamber 74. The precleaner 44 also extends vertically through it, immediately rearward of the fresh air filter 46. The upstream end of the casing 40 connects with the left-hand side wall 14 and an access door 76 provides convenient access from outside of the cab to the filter chamber 74~
The precleaner 44, seen best in Figs. 5 and 6, is of the translational inertial type, the general principles of which are described in Society of Automotive Engineers paper 880B, "High Performance Air Cleaners for the ~rmy's Industrial Gas Turbines"
10 presented in 1964 (see especially pages 3-6). It is positioned by and supported between a pressurizing blower nozzle or outlet 80, molded into the upper casing portion 64, and an open recess 82 molded into the floor of the lower casing portion 66~ The precleaner 44 is essentially a tapered passage of rectangular 15 cross section in which opposite body walls 84 are louvered, with louvers 86 extending laterally and defining a series of upwardly and outwardly directed slots 88. A top transitional portion 90 connects with the pressurizing blower 80 and an exit slot 92 connects with a downwardly directed outlet 94 in the recess 82 20 in the floor 10 of the cab. The lower outlet end of the precleaner 44 is supported in the recess 82 on a resilient gasket or grommet 96. This serves as a compression "spring"
permitting insertion of the precleaner 44 and holding it in place, with a collar 98 engaging the blower nozzle 80. It is 25 thus conveniently removable for service or replacement.
In operation, the cab door 18 is closed and pressurizing blower switched on drawing outside air in through the roof louvers 32. These louvers screen out larger pieces of airborne trash, leaves, etc., but, typically, dust-laden air enters and 30 is delivered downwards, "charging" the precleaner 44. The way in which translational inertial precleaners operate is well-known. The relatively high axial air velocity developed carries dust and dirt downwards at such velocity that the particles have sufficient inertiz to resist the deflection and near reversal of 35 direction it would require to pass through the slots 88. The tapered form of the precleaner helps maintain the air velocity and also develops a static pressure so that much of the air delivered by the blower 42 passes through the louvered slots 88 into the filter chamber 74. In a typical precleaner of this 40 type, about 15 percent of the initial flow of air is lost or l8 bled. In this embodiment it exits vertical~y downwards through the slot 92 and outlet 94 in the floor 10 of the cab taking with it 80 to 95 percent of the dust which had been entrained in the incoming air.
As is conventional the cab structure is designed to "leak"
at a rate which requires a make-up air flow sufficient to maintain air quality in the cab at an acceptable level.
Normally, the pressurizing blower 42, preferably of the constant volume type, runs continuously when the combine is operated with 10 the cab closed. When the recirculating blower 50, preferably variable speed, is also in operation, air from inside the cab is drawn through the recirculating filter 60 to mix with fresh or make-up air passing from the filter chamber 74 through the fresh air filter 46 into the mixing chamber 62. The combined air then 15 passes through heat exchanger ~8 and is conditioned (heated or cooled and possibly dehumidified) according to setting of conventional controls (not shown). Conditioned air is then distributed appropriately in the cab by the distribution duct 52.
Among advantageous features of an operator enclosure atmosphere conditioning system according to the invention, and evident from the drawings and above description are the compact space saving and functionally efficient disposition and layout of the principal components. The "in-series" arrangement of 25 principal components means that all air is drawn through the system with minimum pressure loss and turbulence. The unobtrusive integration of the precleaner 44 achieved by placing it alongside the fresh air filter 46 in the filter chamber 74 enhances the convenience of the location of the main fresh air 30 filter 46. Both the filter and precleaner may be inspected or serviced conveniently through a single acc~ess door 76. The inconvenience of the typically bulky and unsightly external precleaner is avoided. Here, it is completely concealed and is self-cleaning, and its location is such that dust and dirt 35 extracted by it is discharged downwards relatively close to the ground with a reduced possibility of fouling other parts of the combine.
Claims (15)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An atmosphere control system for an operator enclosure of a self propelled vehicle comprising:
a housing inside the enclosure having walls and an inlet and an outlet in the walls both communicating externally of the enclosure;
a pressurizing blower for drawing air through the inlet from outside of the enclosure;
a precleaner within the housing for receiving and dividing the outside air from the pressurizing blower and passing a first portion of that air through the outlet to the atmosphere and a second precleaned portion downstream in the housing, the precleaner functioning to concentrate any dust in the incoming air in the first air portion;
a first air filter in the housing downstream of the precleaner for receiving and filtering the precleaned air portion;
a second air filter covering a second inlet in the housing walls, said second inlet being downstream of the first air filter and said second air filter being operable to filter air entering the housing from the enclosure;
conditioning means, operable to treat a flow of air, disposed within the housing downstream of the first and second filters; and circulating blower means connected to the housing for drawing air through said first and second filters and through said conditioning means and distributing it in the enclosure.
a housing inside the enclosure having walls and an inlet and an outlet in the walls both communicating externally of the enclosure;
a pressurizing blower for drawing air through the inlet from outside of the enclosure;
a precleaner within the housing for receiving and dividing the outside air from the pressurizing blower and passing a first portion of that air through the outlet to the atmosphere and a second precleaned portion downstream in the housing, the precleaner functioning to concentrate any dust in the incoming air in the first air portion;
a first air filter in the housing downstream of the precleaner for receiving and filtering the precleaned air portion;
a second air filter covering a second inlet in the housing walls, said second inlet being downstream of the first air filter and said second air filter being operable to filter air entering the housing from the enclosure;
conditioning means, operable to treat a flow of air, disposed within the housing downstream of the first and second filters; and circulating blower means connected to the housing for drawing air through said first and second filters and through said conditioning means and distributing it in the enclosure.
2. The atmosphere control system of claim 1, wherein the circulating blower means includes a variable speed blower and a distribution duct extending within the enclosure.
3. An atmosphere control system for the operator enclosure of a self-propelled off-the-road vehicle, said enclosure having walls and a floor, comprising:
a plurality of components including;
fresh air inlet means associated with a wall of the enclosure;
a pressurizing blower for drawing air through the inlet;
a precleaner for receiving air delivered by the pressurizing blower and passing a first portion of that air for delivery inside the enclosure and directing a second portion of the air externally of the enclosure;
a fresh air filter for receiving and filtering the first portion of air and passing it downstream;
a heat exchanger for receiving the filtered first portion of air and passing it downstream; and a circulating blower for receiving and circulating within the enclosure air passed downstream by the fresh air filter;
wherein said components, with respect to the flow of the first portion of air and the recirculating air, are arranged in series so that all air entering the system passes downstream and through all components downstream of its point of entry.
a plurality of components including;
fresh air inlet means associated with a wall of the enclosure;
a pressurizing blower for drawing air through the inlet;
a precleaner for receiving air delivered by the pressurizing blower and passing a first portion of that air for delivery inside the enclosure and directing a second portion of the air externally of the enclosure;
a fresh air filter for receiving and filtering the first portion of air and passing it downstream;
a heat exchanger for receiving the filtered first portion of air and passing it downstream; and a circulating blower for receiving and circulating within the enclosure air passed downstream by the fresh air filter;
wherein said components, with respect to the flow of the first portion of air and the recirculating air, are arranged in series so that all air entering the system passes downstream and through all components downstream of its point of entry.
4. The atmosphere control system of claim 3 wherein the precleaner is of the inertial type and the second portion of air is bleed air and said bleed air discharges generally downwards.
5. The atmosphere control system of claim 3 wherein the fresh air inlet means includes an inlet duct having an elevated inlet and further including distributing means, including a distributing duct downstream of the circulating blower.
6. The atmosphere control system of claim 3 wherein the pressurizing blower delivers air directly to the precleaner for charging the precleaner.
7. An atmosphere control system for an operator enclosure of a self-propelled off-the-road vehicle, said enclosure including walls and a floor, comprising:
a generally horizontally extending casing for mounting on the floor of the enclosure and housing and supporting the principal components of the system and having an upstream fresh air inlet and a downstream conditioned air outlet and including an internal transverse fresh air filter wall having an aperture and defining a filter chamber of the casing upstream of the filter wall;
a pressurizing blower in an air delivery relationship with the fresh air inlet for delivering fresh air from outside the enclosure to the filter chamber;
a self-cleaning inertial precleaner for removing dust from the fresh air extending in the filter chamber and having an inlet in a receiving relationship with fresh air from the fresh air inlet, a plurality of clean air outlets communicating with the filter chamber and a dust discharging outlet discharging externally of the filter chamber;
a fresh air filter covering the aperture in the filter wall for filtering air passing downstream from the filter chamber and through the aperture;
a heat exchanger within the casing downstream of the filter aperture and upstream of the conditioned air outlet, the heat exchanger being spaced from the filter aperture so as to define a mixing chamber within the casing;
a recirculating air filter inlet in the casing communicating with the mixing chamber; and a circulating blower associated with the conditioned air outlet for delivering conditioned air through said outlet and into the enclosure.
a generally horizontally extending casing for mounting on the floor of the enclosure and housing and supporting the principal components of the system and having an upstream fresh air inlet and a downstream conditioned air outlet and including an internal transverse fresh air filter wall having an aperture and defining a filter chamber of the casing upstream of the filter wall;
a pressurizing blower in an air delivery relationship with the fresh air inlet for delivering fresh air from outside the enclosure to the filter chamber;
a self-cleaning inertial precleaner for removing dust from the fresh air extending in the filter chamber and having an inlet in a receiving relationship with fresh air from the fresh air inlet, a plurality of clean air outlets communicating with the filter chamber and a dust discharging outlet discharging externally of the filter chamber;
a fresh air filter covering the aperture in the filter wall for filtering air passing downstream from the filter chamber and through the aperture;
a heat exchanger within the casing downstream of the filter aperture and upstream of the conditioned air outlet, the heat exchanger being spaced from the filter aperture so as to define a mixing chamber within the casing;
a recirculating air filter inlet in the casing communicating with the mixing chamber; and a circulating blower associated with the conditioned air outlet for delivering conditioned air through said outlet and into the enclosure.
8. The atmosphere control system of claim 7 wherein the casing comprises an upper half and a lower half, the lower half being carried by the floor and the upper half being removable to provide access to the principal components of the system.
9. The atmosphere control system of claim 7 wherein the precleaner traverses the filter chamber from top to bottom and the dust discharging outlet is directed vertically downwards.
10. A fresh air filtering arrangement for the atmosphere control system of an operator enclosure of an off-the-road vehicle, said enclosure having walls and a floor, comprising:
a filter chamber within the enclosure and adjacent a wall of the enclosure, said chamber having first and second walls and an inlet and first and second outlets in said walls;
an inertial precleaner extending within the filter chamber and having a charging air inlet in communication with the filter chamber inlet, clean air outlets in communication with the filter chamber and a discharge end including a bleed air outlet in communication with the first outlet of the filter chamber;
a clean air filter covering the second outlet of the filter chamber; and power means for delivering air under pressure to the inlet of the filter chamber.
a filter chamber within the enclosure and adjacent a wall of the enclosure, said chamber having first and second walls and an inlet and first and second outlets in said walls;
an inertial precleaner extending within the filter chamber and having a charging air inlet in communication with the filter chamber inlet, clean air outlets in communication with the filter chamber and a discharge end including a bleed air outlet in communication with the first outlet of the filter chamber;
a clean air filter covering the second outlet of the filter chamber; and power means for delivering air under pressure to the inlet of the filter chamber.
11. The fresh air filtering arrangement of claim 10 wherein a wall of the filter chamber includes an access door openable to provide access to the inside of the filter chamber and to the precleaner and filter.
12. The fresh air filtering arrangement of claim 10 wherein the precleaner extends between opposite first and second walls of the filter chamber and the charging inlet of the precleaner is adjacent the first wall and the bleed air outlet of the precleaner is adjacent the second wall.
13. The fresh air filtering arrangement of claim 12 and further including resilient means effective between the second wall and the discharge end of the precleaner for forming a seal between the precleaner bleed air outlet and said wall and for exerting a compressive axial force for retaining the precleaner between the opposite walls.
14. The fresh air filtering arrangement of claim 10 wherein the power means for supplying air comprises a pressurizing blower having a delivery nozzle communicating directly with the charging air inlet of the precleaner.
15. The fresh air filtering arrangement of claim 14 wherein the precleaner is of the translational inertial type and extends generally vertically and wherein the second wall of the filter chamber extends generally horizontally adjacent the floor of the enclosure and said floor includes an aperture so that the bleed air discharge of the precleaner is generally vertically downwards through the floor of the enclosure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/495,320 US4531453A (en) | 1983-05-16 | 1983-05-16 | Atmosphere control arrangement for an operator enclosure |
| US495,320 | 1983-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1221918A true CA1221918A (en) | 1987-05-19 |
Family
ID=23968183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000452292A Expired CA1221918A (en) | 1983-05-16 | 1984-04-18 | Atmosphere control arrangement for an operator enclosure |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4531453A (en) |
| EP (1) | EP0125562B1 (en) |
| AU (1) | AU2723584A (en) |
| BR (1) | BR8402283A (en) |
| CA (1) | CA1221918A (en) |
| DD (1) | DD221970A5 (en) |
| DE (1) | DE3462460D1 (en) |
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-
1983
- 1983-05-16 US US06/495,320 patent/US4531453A/en not_active Expired - Lifetime
-
1984
- 1984-04-18 CA CA000452292A patent/CA1221918A/en not_active Expired
- 1984-04-24 AU AU27235/84A patent/AU2723584A/en not_active Abandoned
- 1984-05-03 DE DE8484104952T patent/DE3462460D1/en not_active Expired
- 1984-05-03 EP EP84104952A patent/EP0125562B1/en not_active Expired
- 1984-05-14 DD DD84263005A patent/DD221970A5/en unknown
- 1984-05-15 BR BR8402283A patent/BR8402283A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AU2723584A (en) | 1984-11-22 |
| BR8402283A (en) | 1984-12-26 |
| DD221970A5 (en) | 1985-05-08 |
| US4531453A (en) | 1985-07-30 |
| DE3462460D1 (en) | 1987-04-09 |
| EP0125562A1 (en) | 1984-11-21 |
| EP0125562B1 (en) | 1987-03-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |