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Publication numberCN1894641 A
Publication typeApplication
Application numberCN 200480037784
PCT numberPCT/US2004/042030
Publication date10 Jan 2007
Filing date13 Dec 2004
Priority date18 Dec 2003
Also published asCN100538579C, EP1697806A1, EP1697806A4, US6993414, US7640077, US20050154495, US20060058924, WO2005059669A1
Publication number200480037784.X, CN 1894641 A, CN 1894641A, CN 200480037784, CN-A-1894641, CN1894641 A, CN1894641A, CN200480037784, CN200480037784.X, PCT/2004/42030, PCT/US/2004/042030, PCT/US/2004/42030, PCT/US/4/042030, PCT/US/4/42030, PCT/US2004/042030, PCT/US2004/42030, PCT/US2004042030, PCT/US200442030, PCT/US4/042030, PCT/US4/42030, PCT/US4042030, PCT/US442030
InventorsRK夏
Applicant开利公司
Export CitationBiBTeX, EndNote, RefMan
External Links: SIPO, Espacenet
Detection of clogged filter in an HVAC system
CN 1894641 A
Abstract  translated from Chinese
在HVAC系统中测量静压,并用于预测HVAC系统中过滤器的状况。 Measuring the static pressure in the HVAC system, the HVAC system and used to predict the condition of the filter. 由于过滤器变得阻塞,可料到静压增加。 Since the filter become clogged, static pressure can be expected to increase. 定期确定该静压变化,并用于预测该过滤器的状况。 Periodically determining the static pressure changes, and used to predict the condition of the filters. 一个显示器提供给使用者过滤器当前状况的指示、以及一旦过滤器达到预定的状况予以更替的建议。 A display provides the user with an indication of the current state of the filter, and once the filter reaches a predetermined condition to be replacement recommendations.
Claims(20)  translated from Chinese
1.一种HVAC系统的控制器,包括:输入,所述输入接收表示在由所述控制器控制的HVAC系统内的压力的测量,并且所述控制器可操作以基于所述测量确定与所述HVAC系统一起使用的过滤器的状况。 An HVAC system controller comprising: an input, said input receiving the measurement expressed in the HVAC system controlled by the pressure controller, and the controller is operable to determine based on the measurement of the said HVAC system for use with the condition of the filters.
2.如权利要求1所述的控制器,其中所述测量表示静压。 2. The controller of claim 1, wherein the measurement represents the static pressure.
3.如权利要求2所述的控制器,其中由所述控制器接收的所述静压测量包括在前的静压和当前的静压,并且利用所述当前的和初始的静压之间的差确定所述过滤器的状况。 3. The controller as recited in claim 2, wherein the static pressure measurement received by the current controller comprises a static pressure and static pressure of the former, and between the current and initial use of the static pressure determining the difference between the condition of the filter.
4.一种HVAC系统,包括:风扇,将空气提供给所述风扇的供给管,所述风扇可操作以将来自所述供给管的空气输送到要调节的环境,以及过滤器,安装所述过滤器以便从由所述风扇输送到所述环境的所述空气中去除杂质;控制器,所述控制器可操作以接收所述系统内的压力指示,并且基于所述压力确定所述过滤器的状况;以及由所述控制器接收的所述压力包括在前的压力和当前的压力,利用所述当前的和在前的压力之间的差提供对过滤器状况的指示。 A HVAC system comprising: a fan, the air supplied to the supply pipe of the fan, the fan is operable to supply pipe from the air to the environment to be adjusted, and a filter, said mounting filter to remove impurities from the conveyor by the fan to the air environment; and a controller operable to receive the pressure within the system indication, and determining the filter based on the pressure condition; and the pressure received by said controller includes a pressure preceding and the current pressure, using the pressure difference between the current and preceding the filter provided between the status indication.
5.如权利要求4所述的HVAC系统,其中确定最大压力,并且如果所述当前的压力超过所述最大压力,则作出立即需要将所述过滤器替换的指示。 5. The HVAC system as recited in claim 4, wherein determining the maximum pressure, and if the current pressure exceeds the maximum pressure, the need to immediately replace the filter indication.
6.如权利要求4所述的HVAC系统,其中显示器提供对所述过滤器的阻塞状况百分比的指示。 6. The HVAC system as recited in claim 4, wherein said filter monitor provides the percentage of traffic congestion condition indication.
7.如权利要求6所述的HVAC系统,其中所述显示器包括一旦所述过滤器的所述状况达到预定的状况就建议替换所述过滤器的指示。 7. The HVAC system as recited in claim 6, wherein said display includes once the condition of the filter reaches a predetermined condition is recommended to replace the filter directions.
8.如权利要求4所述的HVAC系统,其中所述在前的压力读数是初始压力。 8. The HVAC system as recited in claim 4 wherein said previous pressure reading is an initial pressure.
9.如权利要求8所述的HVAC系统,其中当对与所述控制器关联的复位按钮动作时,所述控制器接收对所述在前压力的替换。 9. The HVAC system as recited in claim 8, wherein when the pair associated with the operation of the reset button on the controller, the controller receives the replacement of the former pressure.
10.如权利要求4所述的HVAC系统,其中所述当前的和在前的压力读数是静压读数。 10. The HVAC system as recited in claim 4, wherein the current and the previous pressure reading is static pressure reading.
11.如权利要求10所述的HVAC系统,其中通过下面的公式利用所述当前的和在前的静压读数确定过滤器状况:过滤器使用的%=(当前-先前)/(X*(最大-先前)),其中x是乘数,“最大”是表示阻塞的过滤器的在前定义的最大压力。 11. The HVAC system as recited in claim 10, wherein the following formula using the current and previous static pressure readings to determine the filter condition: the filter of% = (current - previous) / (X * ( Maximum - previous)), where x is the multiplier, the "max" is the maximum pressure of the front filter clogging defined.
12.如权利要求11所述的HVAC系统,其中X是小于1.0的乘数。 12. The HVAC system as recited in claim 11, wherein X is a multiplier less than 1.0.
13.如权利要求12所述的HVAC系统,其中X等于0.6。 13. The HVAC system as recited in claim 12, wherein X is equal to 0.6.
14.如权利要求11所述的HVAC系统,其中所述在前的压力读数是初始压力读数。 14. The HVAC system as recited in claim 11, wherein said previous pressure reading is an initial pressure reading.
15.一种确定HVAC系统中过滤器的状况的方法,包括以下步骤:(1)提供包括过滤器的HVAC系统,所述过滤器过滤由所述HVAC系统输送到要调节的环境的空气;(2)通过所述过滤器将空气移动到所述环境;(3)测量所述系统内的压力,并且利用所述测量的压力确定所述过滤器的当前状况。 15. A method for the HVAC system to determine the condition of the filters, comprising the steps of: (1) providing an HVAC system includes a filter, the filter medium is conveyed by the HVAC system to the air to be conditioned environment; ( 2) through the filter is moved to the ambient air; pressure (3) measurement of the system, and determining a current condition of the filter utilizing the measurement of pressure.
16.如权利要求15所述的方法,其中步骤(3)的压力测量包括将在前测量的压力与当前压力比较,并且利用该差确定所述过滤器的所述状况。 16. The method of claim 15, wherein the pressure of step (3) of measuring includes measuring the pressure in the first comparison with the current pressure, and utilizing the condition of the filter determining the difference.
17.如权利要求16所述的方法,其中将所述在前的压力测量作为初始压力读数。 17. A method as claimed in claim 16, wherein the pressure of the previous measurement as an initial pressure reading.
18.如权利要求17所述的方法,其中将所述压力读数作为静压读数。 18. The method of claim 17, wherein said pressure reading as static pressure readings.
19.如权利要求15所述的方法,进一步包括基于所述当前的状况确定所述过滤器中剩余寿命的百分比,并且显示所述剩余寿命的步骤。 19. The method of claim 15, further comprising determining the percentage of remaining life of the filter based on the current condition of the, and the step of the remaining life of the display.
20.如权利要求15所述的方法,进一步包括提供复位按钮使使用者将所述过滤器的当前状况复位成新的状况的步骤。 20. The method of claim 15, further comprising providing a reset button to allow the user to reset the current condition of the filter into a new condition of the step.
Description  translated from Chinese
HVAC系统中受阻塞过滤器的检测 Detection HVAC system blocked filter

技术领域 FIELD

本发明利用HVAC系统中的压力测量来确定何时空气过滤器已阻塞到应予以替换的地步。 The present invention utilizes the HVAC system pressure measurements to determine when the air filter has been blocked to the point and should be replaced.

背景技术 BACKGROUND

利用过滤器将洁净的空气提供到HVAC系统,以在要受到加热或冷却的环境内循环。 Use of the filter will provide clean air to the HVAC system, to circulate in the subject to be heated or cooled environment. 众所周知,一般将过滤器放置在风扇的上游,抽吸空气通过过滤器,从空气中去除杂质。 It is well known generally placed upstream of the filter fan, drawing air through the filter, to remove impurities from the air.

随着时间的流逝,过滤器变得阻塞,最后应当将其替换。 Over time, the filter becomes blocked, and finally it should be replaced. 阻塞的过滤器为风扇的进一步操作造成困难,并且增加了风扇的负荷。 Clogged filter caused difficulties for further operation of the fan, and increasing the load on the fan. 而且,在某种情况下,过滤器会饱和到停止空气流动,这也是不希望的。 Moreover, in some cases, the filter is saturated to stop the air flow, which is undesirable.

在现有技术中,已有定期替换过滤器的建议。 In the prior art, there have been regular filter replacement recommendations. 例如,一种已知的温度调节装置,在先前的过滤器替换一段时间之后,提供建议过滤器替换的信号。 For example, a known temperature control device after the previous filter replacement time, provide recommendations to replace the filter signal. 然而,这种系统是基于假设的过滤器状况,而不是基于实际的过滤器状况。 However, this system is based on the assumption of a filter condition, but not on the actual condition of the filter. 这种假设会导致将过滤器替换得过于频繁,或者不够频繁。 This assumption will result in the replacement of the filter too frequently, or not frequently enough.

一种已知的系统利用监视风扇速度的控制,并且如果风扇速度表示过滤器变脏则预测过滤器变脏。 A known system uses to monitor fan speed control, and if the fan speed indicates the prediction filter dirty filter is dirty. 虽然这种方法比现有技术的“假设”方法更有利,但是仍然希望提供确定过滤器状况的可选择的方法。 While this approach than the prior art "hypothesis" method is more advantageous, but still desirable to provide a filter condition determining alternative method.

发明内容 SUMMARY

在本发明公开的实施方式中,进行并且评估压力测量以确定过滤器状况。 In the disclosed embodiment of the invention, the pressure measurements performed and evaluated to determine the filter condition. 在实施方式中,评估测量的静压变化并用于预测过滤器阻塞的百分比。 In the embodiment, the static pressure measured and used to assess changes in the percentage of the prediction filter clogged.

在实施方式中,在假设过滤器洁净的情况下取“初始”静压读数。 In an embodiment, under the assumption that the filter clean circumstances take an "initial" static pressure reading. 然后定期地取“当前”静压读数,并且将其与初始压力比较。 Then periodically take "current" static pressure readings, and comparing it to the initial pressure. 利用初始压力和当前压力之间的变化来确定该过滤器的状况。 Use change between the initial pressure and the current pressure to determine the condition of the filter.

通过下面的说明和附图可以最好地理解本发明的这些和其它特征,下面是附图的简要描述。 Through the following description and drawings can be best understood These and other features, the following is a brief description of the drawings of the present invention.

附图说明 Brief Description

附图1是HVAC系统的示意图。 1 is a schematic view of an HVAC system.

附图2是本发明的流程图。 Figure 2 is a flow diagram of the invention.

附图3是实验值的曲线图。 Figure 3 is a graph showing experimental values.

具体实施方式 DETAILED DESCRIPTION

附图1中示意性地显示了HVAC系统20。 Figure 1 schematically shows the HVAC system 20. 如图所示,操作HVAC系统20以加热或冷却环境22。 As shown, the HVAC system 20 is operating to heat or cool the environment 22. 组件24如炉子提供来自进入空气管25的空气。 A furnace assembly 24 into the air provided from the air tube 25. 典型地,将过滤器26布置在进入空气管25上,以及风扇28的上游。 Typically, the filter 26 is disposed in the intake air pipe 25, and upstream of the fan 28. 风扇28将空气抽过进入管25、过滤器26以及炉子24。 The fan 28 draws air through the inlet duct 25, the filter 26 and the furnace 24. 将来自炉子24的空气导入管30,然后通过具有挡板34的子管32导入不同的区域。 Air from the furnace 24 is introduced into tube 30, tube 32 is then introduced into different regions by having a stopper 34 of the sub.

如上所述,希望定期地替换会变得阻塞的过滤器26。 As described above, want to replace periodically become clogged filter 26. 本发明涉及一种确定何时应替换过滤器26的方法。 The present invention relates to a method for determining when to replace the filter method (26). 控制器36如微处理器显示与温度调节装置37关联,并且可以操作以提供过滤器26的信息。 Display controller 36 such as a microprocessor 37 associated with temperature regulating means, and operable to provide the filter information 26.

本发明依靠识别静压是三点处的压降之和,这三点即通过管道系统、穿过炉子和穿过过滤器。 The present invention relies on the identification of static pressure is the pressure drop and the three points, which is three points through the pipeline system through the stove and through the filter. 通过管和炉子的压降通常是恒定的,并且对于任何给定的空气流是可预测的。 The pressure drop through the tube and the furnace is generally constant, and for any given air flow is predictable. 然而,穿过过滤器的压降随时间增加,这是由于过滤器受尘埃负累。 However, the pressure drop across the filter increases with time, which is due to the filter by the dust burden.

可以将静压作为输送的空气流和感应的风扇电动机速度的函数计算,并且采取表征特定炉子和风扇模型的常数。 Static pressure can be used as conveying air flow and the induction of the fan motor speed calculated as a function, and to take the furnace and fan model characterizing specific constants. 确定静压的最优选的算法在2003年4月30日申请的,并且标题为“利用速度可变的鼓风机马达确定管道空气输送系统中的静压的方法(Method of Determining Static Pressure in a DuctedAir Delivery System Using a Variable Speed Blower Motor)”的美国专利申请No.10/426463中公开,在此将其公开的全部内容合并作为参考。 HIP algorithm to determine the most preferred in the April 30, 2003 to apply, and titled "Use of variable speed air blower motor to determine the pipeline transportation system static pressure method (Method of Determining Static Pressure in a DuctedAir Delivery System Using a Variable Speed Blower Motor) "U.S. Patent Application No.10 / 426463 discloses, in this the entire disclosure of which is incorporated herein by reference.

本发明认识到静压变化可标示过滤器26的状况变化。 The present invention recognizes that changes in static pressure may be designated 26 changes the filter condition. 利用这种认识提供过滤器26实际状况在温度调节装置37的反馈。 With this understanding of the actual situation of filter 26 provides a feedback means 37 of the temperature adjustment. 可以看到,温度调节装置37具有视觉的“过滤器使用的%”显示条。 Can be seen, the temperature adjustment 37 has a visual "filter% used" means display bar.

在优选的方法中,该系统取得初始静压测量。 In a preferred method, the system has made an initial static pressure measurement. 可以在开始通电和安装系统时一开始就办妥,或者任何时候房主通过按复位按钮手动启动过滤器时。 You can start at the beginning of powered and completed installation of the system, or at any time when you press the reset button homeowners started manually filter through. 该初始静压在温度调节装置37的控制36中与新的或者洁净的过滤器有关。 Control means 37 and 36 in a new or clean filter about the initial static pressure of the temperature adjustment. 将从该初始静压的变化作为该过滤器的变化状况的指示。 From the change of the initial static pressure change as an indication of the status of the filter.

定期地采取当前的静压测量。 Periodically take the current static pressure measurements. 这些测量可以在微处理器36的控制下每单位时间例如一天再做一次。 These measurements can be for example per unit time in a day to do it again under the control of the microprocessor 36. 也可以在用户界面将该系统从操作模式关掉的任何时间进行该测量,例如在过滤器更换时进行。 This measurement may be performed at any time the user interface from the operation mode to turn off the system, for example, when filter replacement performed.

除此之外,如果“当前”的静压测量总是小于“初始”的静压测量,则用新读取的当前静压测量代替以前存储的初始静压。 In addition, if the "current" of the static pressure measurement is always less than the "initial" static pressure measurement, the new measurement with the current static pressure is read instead of the previously stored initial static pressure.

优选地通过微处理器36在关闭加热或冷却模式的一段风扇预运行时间如五分钟,进行静压测量。 Preferably by the microprocessor 36, such as in a closed heating or cooling mode the fan pre-run time period of five minutes, the static pressure measurement. 风扇28优选地以小于100%名义冷却空气流量(例如70%)运行。 Fan 28 is preferably cooled to less than 100% of the nominal air flow rate (e.g., 70%) run. 当响应从关闭到操作模式的手动切换完成测量时,在该测量之前将持续的风扇预运行时间减少到两分钟,以便为想要看到过滤器变化的结果的使用者提供更快的响应。 When the response from the closed to the manual operation mode switch is complete measure before the measure will reduce the duration of the fan pre-run time of two minutes, in order to want to see the results of the filter change the user to provide faster response. 选择70%水平的风扇操作,以便在该测量过程期间将噪声最小化,同时还提供足够的分辨率。 Select the 70% level of fan operation, so that, during the measurement noise is minimized, while still providing sufficient resolution.

在测量期间,取得几次风扇电动机的速度读数,例如以10秒间隔进行六次。 During the measurement, the fan motor speed to obtain several readings, for example, six times at 10 second intervals. 然后优选地求这些读数的平均值。 Preferably then averages these readings. 如果在该过程期间使用温度调节装置37上的条观察过滤器,则优选地不示出使用的百分比。 If the temperature adjustment bar 37 was observed on the filter means during this process, it is preferable not to use the percentage shown. 而最优选地,显示测量正在进行的某种指示(例如,测量中)。 And most preferably, the measurement is in progress displays some indication (e.g., measurement).

如果中断加热或冷却以便计算测量,则微处理器36中的控制逻辑优选地一旦该测量完成,保证阶段计时器就不再延迟加热或冷却的准备。 If the interrupt is heated or cooled in order to calculate the measurement, the microprocessor control logic 36 is preferably Once the measurement is complete, the timer is no longer guaranteed delay stage heating or cooling preparation. 如上所述,最优选地基于在上述参考的应用中提及的专有公式确定静压。 As described above, most preferably based on a proprietary formula mentioned in the above-referenced applications is determined static pressure. 然而,本领域的普通技术人员能够确立确定静压的其它方法。 However, one of ordinary skill in the art can establish other methods to determine the static pressure. 假设风扇电动机减少到70%,则优选地将某个乘数乘以确定的静压,以便得到实际值(即两倍于测量值,以便提供完全名义上的冷却空气流量的值)。 Assuming the fan motor to reduce the 70%, it is preferable to determine the static pressure multiplied by a multiplier to obtain actual values (i.e., twice the measured value, in order to provide full nominal value of the cooling air flow).

还可以识别最大静压。 You can also identify the maximum static pressure. 这表示室内风扇相对于阻塞的过滤器输送完全的冷却空气流的能力。 This means that with respect to the indoor fan conveyed completely clogged filter cooling air flow capacity. 最大静压表示完全阻塞的过滤器26,并且其基于炉子和风扇型号、以及相对于最大许可AC和热泵大小的AC或热泵尺寸确定的。 The maximum static pressure means fully clogged filter 26, and its model based on the stove and fan, as well as with respect to the maximum allowable size of the AC-AC and heat pump or pump size determined. 也就是说,将最大静压定义为某种系统特性,其会依赖于系统中组件的选择组合而变化,但是对于一旦确定的系统通常是固定的。 That is, the maximum static pressure is defined as a system characteristic, which would depend on selecting the combination of components in the system varies, but for the system once determined is usually fixed. 优选地将最大静压存储在微处理器36内。 Preferably, the maximum static pressure stored in the microprocessor 36. 一旦微处理器36了解实际系统中几个组件中的每一个,或者可以是某个预置数字,就可以确定该最大静压,该数字是可能优选的最大静压的近似值。 Once the microprocessor 36 for the actual system components of each of several, or may be a preset number, the maximum static pressure can be determined, this figure is the maximum static pressure may be preferred approximation.

如图2所示,一旦完成静压测量,则可以计算过滤器使用的百分比。 As shown in Figure 2, once the static pressure measurements, you can calculate the percentage of the filters used. 在附图2的流程图中,可以看到,优选的方法采取当前的静压和初始压力之间的差,并且将其除以最大值和初始值之间的差的百分比。 In the flowchart of Figure 2, can be seen, the preferred method of taking the difference between the current and the static pressure between the initial pressure, and the percentage difference between the maximum value and divided by the initial values. 最优选地,使过滤器使用的百分比相对于其先前值上下算到最近的10%,以便提供某些希望的滞后。 Most preferably, so that the percentage of the filter used previously with respect to its upper and lower count value to the nearest 10%, in order to provide certain desired hysteresis. 另一方面,如果过滤器使用的百分比小于5%,则优选地将其算到0%。 On the other hand, if the percentage of the filter used is less than 5%, it is preferable to count to 0%. 这保证了当用洁净的过滤器26替换先前的过滤器26时,其从0%读数开始。 This ensures that when the previous replacement with a clean filter 26 when the filter 26, which starts from the 0% reading.

如果过滤器使用的百分比是100%或者更大,则在温度调节装置36上使用的条显示填满,但是即使其大于100%,印出的数值优选地表示实际确定的百分比数。 If the percentage of the filter used is 100% or more, the article used in the temperature adjustment means 36 is displayed on the fill, but even if it is more than 100%, the printed value preferably represents the actual percentage determined.

最优选地,使用下面的公式:过滤器使用的%=(当前-初始)/(0.6*(最大-初始))。 Most preferably, using the following formula:% = filter used (current - initial) / (0.6 * (Max - initial)).

该优选的公式算入过滤器26负荷了多少(当前-初始)以及系统能够容受的初始压降是多少(最大-初始)。 The preferred formula counted the number of filter 26 load (current - initial) and the system is able to suffer the initial pressure drop is the number (maximum - initial). 乘数X(例如0.6)允许不同的初始值,以便产生100%的负荷值。 Multiplier X (e.g., 0.6) allows different initial values, to produce a 100% load value. 当然,可以使用除了0.6以外的乘数。 Of course, can be used in addition to the 0.6 multiplier. 较低的初始压降导致在该过滤器用尽之前更大的容许增加。 Lower initial pressure drop leads to a greater increase in allowable before the filter is exhausted. 另一方面,较高的初始压降允许较小的增加空间,但是过滤器的寿命会在更高的绝对静压结束,如果其仍然在可接受的界限内。 On the other hand, higher initial pressure drop allows a smaller increase in space, but the life of the filter will be in the higher end of the absolute static pressure, if it is still within acceptable limits. 例如在附图3所示的曲线图中示出,其是“过滤器使用的”相对于“当前的静压”变化的测量值。 For example, in the drawings the graph shown in Figure 3 is shown, which is relative to the "current static pressure" measurement of change value "filter used." 注意到在“过滤器使用的”接近100%、给定明显的和递增的初始静压时得到更高的当前压力。 Noted a higher current pressure in the "filter used" close to 100%, and given significant incremental initial static pressure.

在区域系统中,通常可以重复上述方法,然而最希望的是在该测量过程期间保持所有的挡板34打开。 At the regional system, usually can repeat the above methods, but the most desirable during the measurement process to keep all of the baffle 34 is open. 可以具有不同系统的改进,其中可以预测在区域系统的“公共”部分中的静压。 Different systems may have improved, in which can be predicted in the "public" portion of a static area of the system. 也就是说,可以在不特定于该区域的地区(即不包括子管32)中确定静压。 In other words, you can determine the static pressure in the region are not specific to the region (ie, not including sub-tube 32). 由于过滤器26在该公共地区内,因而仅该静压是对本发明必要的。 Since the filter 26 in the common area, and therefore the static pressure is only necessary for the present invention.

总而言之,本发明定义一种确定过滤器26的实际状况,以及预测其剩余寿命的百分比的方法。 All in all, the definition of the present invention is a method of determining the actual state of the filter 26, as well as methods to predict the percentage of its remaining life. 由于利用的是实际状况,因而本发明更精确地预测过滤器26的状况,并且保证必要时替换过滤器26,但是同时避免了对仍然具有剩余使用寿命的过滤器26的替换。 Since the use of the actual situation, and thus the present invention is to more accurately predict the condition of the filter 26, and replacement when necessary to ensure the filter 26, but while still avoiding the replacement of the remaining useful life of the filter 26.

虽然公开了本发明的优选实施方式,但是本领域的技术人员会认识到某些修改也在本发明的范围之内。 Although the disclosed preferred embodiment of the present invention, those skilled in the art will recognize that certain modifications are also within the scope of the present invention. 为此,应研究下面的权利要求以确定本发明的真实范围和内容。 For this reason, the following claims should be studied to determine the true scope and content of the present invention.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
CN104001559A *27 Feb 201327 Aug 2014海尔集团公司Biosafety cabinet able to remind filter's life
Classifications
International ClassificationG05B21/00, F24F11/00, G05D23/00, G05B23/02
Cooperative ClassificationF24F2011/0093, F24F11/0086, B01D46/0086, B01D2279/50, B01D46/446
European ClassificationF24F11/00R9, B01D46/44P, B01D46/00S10
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