CN103306962A - Protection method and detection circuit for freon shortage of compressor - Google Patents
Protection method and detection circuit for freon shortage of compressor Download PDFInfo
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- CN103306962A CN103306962A CN2013102804296A CN201310280429A CN103306962A CN 103306962 A CN103306962 A CN 103306962A CN 2013102804296 A CN2013102804296 A CN 2013102804296A CN 201310280429 A CN201310280429 A CN 201310280429A CN 103306962 A CN103306962 A CN 103306962A
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- compressor
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- fluorine
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Abstract
The invention relates to a protection method for freon shortage of a compressor. The protection method comprises the following steps: a, converting current of the compressor into a DC signal through a current transformer and a current detection circuit, and sampling through a first A/D port of a control unit of an MCU structure so as to obtain an actual current value; b, converting an environment temperature signal into another DC signal through an environment temperature sensor, and sampling through a second A/D port of the control unit of the MCU structure so as to obtain an environment temperature; c, adjusting rated current value of the compressor via the environment temperature, and comparing the obtained actual current value with the rated current value of the compressor, if the actual current value is lower than the protection threshold value of the rated current value, halting the compressor and alarming, and if not, enabling the compressor to operate normally. According to the invention, freon shortage of the compressor can be accurately and effectively judged, intelligentized judgment on freon shortage failure is realized, and overhaul and troubleshooting by working personnel are obviously convenient, so that safety and stability of the compressor system are greatly improved.
Description
Technical field
The present invention relates to control and the detection of circuit, is guard method and testing circuit that compressor lacks fluorine concretely.
Background technique
In the water chilling unit system process, lacking freon (being designated hereinafter simply as scarce fluorine) is the phenomenon that this system often occurs.System lacks the fluorine operation for a long time will will cause fatal destruction to the especially high-power compressor of compressor.Because when system lacks fluorine, compressor air suction end cold medium shortage, the compressor heat that produces that runs up just can not distribute normally, thereby cause accumulation of heat, the temperature superelevation, long-play can damage compressor coil insulation, finally burns compressor.
Each producer of air conditioner industry mainly adopts simple lower pressure switch detection mode to carry out stoppage protection at present.In this method design certain defective and narrow limitation are arranged: when 1, pressure switch is damaged, may cause erroneous judgement maybe can not judge; 2, during heating and defrosting, pressure is on the low side also can to cause erroneous judgement; 3, pressure switch protection disconnects, and shuts down the back very fast balance of pressure and also recovers normal operating pressure, can cause the high frequent start-stop, influences compressor working life; 4, scarce not concrete, indeterminate, the intelligent degree of fluorine phenomenon of the failure is low, also needs to rely on maintenance technician's experience to make a decision by manually connecing the gauge measurement actual pressure at the detection valve; 5, scarce fluorine judgement is untimely, and in time stoppage protection may cause compressor and system thereof to damage fully.
Summary of the invention
The invention provides guard method and testing circuit that a kind of compressor lacks fluorine; it is inaccurate to lack the fluorine diagnosis at present system; intelligent degree is low; react untimely problem; the maintainer can be hunted leak in time, accurately according to the fault prompting fill fluorine, thereby guarantee the normal operation of compressor assembly.
Compressor of the present invention lacks the guard method of fluorine, comprising:
A. by current transformer and current detection circuit compressor current being converted to direct current signal, and the A/D(mould/number of the control unit by the MCU structure) port samples, and obtains actual current value;
B. by environment temperature sensor ambient temperature signal being converted into direct current signal, and the 2nd A/D(mould/number of the control unit by the MCU structure) port samples, and obtains ambient temperature;
C. adjust the load current value of compressor according to described ambient temperature, the actual current value that gets access to is compared with the load current value of compressor, if actual current value is lower than the protection threshold value of load current value, then to compressor shutdown and warning; Otherwise compressor normally moves.Protection threshold value described here can be set according to actual environment.Judged whether to lack fluorine by the detection to current value voluntarily by circuit like this, solved untimely, the inaccurate problem of artificial judgment.
A kind of concrete method is the described step that relatively comprises of step c:
Compressor is under refrigerating state, set the first outdoor environment temperature standard, when detecting the outdoor temperature every rising of the more described first outdoor environment temperature standard or reducing by 1 ℃ (according to the different needs of precision, other corresponding changing value also can be set), then increase or reduce the compressor load current value of corresponding proportion; After detecting the protection threshold value and certain time that described actual current value is lower than the compressor load current value, be judged as scarce fluorine;
Compressor is under the state of heating, set the second outdoor environment temperature standard, when detecting the outdoor temperature every rising of the more described second outdoor environment temperature standard or reducing by 1 ℃ (according to the different needs of precision, other corresponding changing value also can be set), then reduce or increase the compressor load current value of corresponding proportion; After detecting the protection threshold value and certain time that described actual current value is lower than the compressor load current value, be judged as scarce fluorine.
For energy saving, improve judging efficiency, can not detect whether lack fluorine at the state that does not need to judge, for example in set time, do not judge whether to lack fluorine behind the compressor start; If compressor is in defrost state, do not judge whether to lack fluorine.
Preferably, described set time was 10 minutes, or other time span that is fit to, as 5 minutes, 8 minutes, 15 minutes etc.
Under the most relatively environment, a kind of can general setting be that the described first outdoor environment temperature standard is 35 ℃; When outdoor temperature than the every rising of the first outdoor environment temperature standard or reduce by 1 ℃, then increase or reduce 1.4% compressor load current value; The protection threshold value of compressor load current value is 80% load current value; After actual current value is lower than the protection threshold value of compressor load current value and continues 10 minutes, be judged as scarce fluorine;
Described second outdoor environment temperature is 7 ℃; When outdoor temperature than the every rising of the second outdoor environment temperature standard or reduce by 1 ℃, then increase or reduce 1% compressor load current value; The protection threshold value of compressor load current value is 80% load current value; After actual current value is lower than the protection threshold value of compressor load current value and continues 10 minutes, be judged as scarce fluorine.
The present invention also provides a kind of testing circuit that lacks fluorine for the compressor of said method, control unit with MCU structure, described control unit connects current transformer by first output terminal, connects the temperature transducer that detects ambient temperature by second output terminal;
First output terminal of control unit is connected with current transformer by in parallel first resistance, second resistance, first electric capacity, second electric capacity and the 4th resistance, and connects DC electrical source input by the positive and negative electrode of the common current input terminal of first electric capacity, second electric capacity and the 4th resistance by second diode;
Second output terminal of control unit connects the two ends of described temperature transducer respectively by the positive and negative electrode of the 3rd electric capacity, and the positive pole of the 3rd electric capacity also connects DC electrical source, negative pole by the 4th electric capacity in parallel and the 5th resistance after ground connection.
Further, between second resistance and first electric capacity current input terminal separately, be in series with first diode and the 3rd resistance by current direction, play the effect of current limliting and control current direction.
Preferably, described first electric capacity is electrochemical capacitor, and second electric capacity is Leaded Ceramic Disc Capacitor.
Preferably, described the 3rd electric capacity is electrochemical capacitor, and the 4th electric capacity is Leaded Ceramic Disc Capacitor.
Concrete, be that the dc voltage value that will sample compares with the electric current truth table of preserving in storage unit among the step a, obtain described actual current value.
Compressor of the present invention lacks guard method and the testing circuit of fluorine; it is inaccurate to have solved the scarce fluorine diagnosis of present system; intelligent degree is low; react untimely problem; can judge the scarce fluorine situation of compressor accurately and effectively; realized that intelligent judgement lacks the fluorine fault, obviously made things convenient for staff's maintenance and investigation, thereby improved Security and the stability of compressor assembly greatly.
Below in conjunction with embodiment's embodiment, foregoing of the present invention is described in further detail again.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example.Do not breaking away under the above-mentioned technological thought situation of the present invention, various replacements or change according to ordinary skill knowledge and customary means are made all should comprise within the scope of the invention.
Description of drawings
Fig. 1 lacks the flow chart of the guard method of fluorine for compressor of the present invention.
Fig. 2 lacks the testing circuit figure of fluorine for compressor of the present invention.
Embodiment
Embodiment 1:
As shown in Figure 1, the guard method of the scarce fluorine of compressor of the present invention comprises:
A. by current transformer LA and current detection circuit compressor current is converted to direct current signal, this voltage of signals is between 0V to 5V.And the A/D(mould/number of the control unit by the MCU structure) port AN1 samples, and with the dc voltage value that samples and the electric current truth table of preserving in storage unit relatively, obtains actual current value I
Real
B. by environment temperature sensor RT ambient temperature signal is converted into direct current signal, this voltage of signals is between 0V to 5V.And the 2nd A/D(mould/number of the control unit by the MCU structure) port AN2 samples, and obtains ambient temperature T
Ring
C. according to described ambient temperature T
RingAdjust the load current value of compressor, the actual current value that gets access to and the load current value of compressor compared, be specially:
(1) compressor is under refrigerating state, and the first outdoor environment temperature standard of setting is 35 ℃; As outdoor environment temperature T
RingThan the every rising of the first outdoor environment temperature standard or reduce by 1 ℃, then increase or reduce 1.4% compressor load current value I
VolumeWhen measuring actual current value I
RealBe lower than the normal rating current value I
Positive volume80%, and when continuing more than 10 minutes, be judged to be scarce fluorine, hard stop, and send malfunction alarm to Centralized Controller; Formula is:
The normal rating current value I
Positive volume=I
Volume* [1-(35-T
Ring) * 1.4%],
I
Real＜I
Positive volume* 80%, and continue more than 10 minutes, be judged to be scarce fluorine fault.
(2) setting second outdoor environment temperature is 7 ℃; As outdoor environment temperature T
RingThan the every rising of the second outdoor environment temperature standard or reduce by 1 ℃, then increase or reduce 1% compressor load current value I
VolumeWhen measuring actual current value I
RealBe lower than the normal rating current value I
Positive volume80%, and when continuing more than 10 minutes, be judged to be scarce fluorine, hard stop, and send malfunction alarm to Centralized Controller; Formula is:
The normal rating current value I
Positive volume=I
Volume* [1-(7-T
Ring) * 1.4%],
I
Real＜I
Positive volume* 80%, and continue more than 10 minutes, be judged to be scarce fluorine fault.
(3) do not judge whether to lack fluorine behind the compressor start in 10 minutes.
(4) compressor is in defrost state, does not judge whether to lack fluorine.
Embodiment 2:
The testing circuit that is used for embodiment 1 as shown in Figure 2, the control unit with MCU structure, described control unit connects current transformer LA by the first output terminals A N1, connects the temperature transducer RT that detects ambient temperature by the second output terminals A N2;
The first output terminals A N1 of control unit is connected with current transformer LA by first resistance R 1, second resistance R 2, first capacitor C 1, second capacitor C 2 and the 4th resistance R 4 in parallel, imports actual current value I by current transformer LA to circuit
RealFirst capacitor C 1, second capacitor C 2 and the 4th resistance R 4 common current input terminals connect the DC electrical source input of 5V by the positive and negative electrode of the second diode VD2.Between second resistance R 2 and first capacitor C 1 current input terminal separately, be in series with the first diode VD1 and the 3rd resistance R 3 by current direction, play the effect of current limliting and control current direction.Wherein first capacitor C 1 is electrochemical capacitor, and second capacitor C 2 is Leaded Ceramic Disc Capacitor.
The second output terminals A N2 of control unit connects the two ends of described temperature transducer RT respectively by the positive and negative electrode of the 3rd capacitor C 3, and the positive pole of the 3rd capacitor C 3 also connects the DC electrical source of 5V, and negative pole is by the 4th capacitor C 4 in parallel and the 5th resistance R 5 back ground connection GND.Wherein the 3rd capacitor C 3 is electrochemical capacitor, and the 4th capacitor C 4 is Leaded Ceramic Disc Capacitor.
Claims (10)
1. compressor lacks the guard method of fluorine, and its feature comprises:
A. by current transformer and current detection circuit compressor current is converted to direct current signal, and an A/D port of the control unit by the MCU structure samples, obtain actual current value;
B. by environment temperature sensor ambient temperature signal is converted into direct current signal, and the 2nd A/D port of the control unit by the MCU structure samples, obtain ambient temperature;
C. adjust the load current value of compressor according to described ambient temperature, the actual current value that gets access to is compared with the load current value of compressor, if actual current value is lower than the protection threshold value of load current value, then to compressor shutdown and warning; Otherwise compressor normally moves.
2. compressor as claimed in claim 1 lacks the guard method of fluorine, it is characterized by: the described step that relatively comprises of step c:
Compressor is set the first outdoor environment temperature standard under refrigerating state, when detecting the outdoor temperature every rising of the more described first outdoor environment temperature standard or reducing by 1 ℃, then increase or reduce the compressor load current value of corresponding proportion; After detecting the protection threshold value and certain time that described actual current value is lower than the compressor load current value, be judged as scarce fluorine;
Compressor is set the second outdoor environment temperature standard under the state of heating, when detecting the outdoor temperature every rising of the more described second outdoor environment temperature standard or reducing by 1 ℃, then reduce or increase the compressor load current value of corresponding proportion; After detecting the protection threshold value and certain time that described actual current value is lower than the compressor load current value, be judged as scarce fluorine.
3. compressor as claimed in claim 2 lacks the guard method of fluorine, it is characterized by: do not judge whether to lack fluorine behind the compressor start in set time; If compressor is in defrost state, do not judge whether to lack fluorine.
4. compressor as claimed in claim 3 lacks the guard method of fluorine, and it is characterized by: described set time is 10 minutes.
5. compressor as claimed in claim 2 lacks the guard method of fluorine, it is characterized by:
The described first outdoor environment temperature standard is 35 ℃; When outdoor temperature than the every rising of the first outdoor environment temperature standard or reduce by 1 ℃, then increase or reduce 1.4% compressor load current value; The protection threshold value of compressor load current value is 80% load current value; After actual current value is lower than the protection threshold value of compressor load current value and continues 10 minutes, be judged as scarce fluorine;
Described second outdoor environment temperature is 7 ℃; When outdoor temperature than the every rising of the second outdoor environment temperature standard or reduce by 1 ℃, then increase or reduce 1% compressor load current value; The protection threshold value of compressor load current value is 80% load current value; After actual current value is lower than the protection threshold value of compressor load current value and continues 10 minutes, be judged as scarce fluorine.
6. the compressor that is used for the described method of claim 1 lacks the testing circuit of fluorine, its feature comprises: the control unit with MCU structure, described control unit connects current transformer by first output terminal, connects the temperature transducer that detects ambient temperature by second output terminal;
First output terminal of control unit is connected with current transformer by in parallel first resistance, second resistance, first electric capacity, second electric capacity and the 4th resistance, and connects DC electrical source input by the positive and negative electrode of the common current input terminal of first electric capacity, second electric capacity and the 4th resistance by second diode;
Second output terminal of control unit connects the two ends of described temperature transducer respectively by the positive and negative electrode of the 3rd electric capacity, and the positive pole of the 3rd electric capacity also connects DC electrical source, negative pole by the 4th electric capacity in parallel and the 5th resistance after ground connection.
7. testing circuit as claimed in claim 6 is characterized by: be in series with first diode and the 3rd resistance by current direction between second resistance and first electric capacity current input terminal separately.
8. as claim 6 or 7 described testing circuits, it is characterized by: described first electric capacity is electrochemical capacitor, and second electric capacity is Leaded Ceramic Disc Capacitor.
9. as claim 6 or 7 described testing circuits, it is characterized by: described the 3rd electric capacity is electrochemical capacitor, and the 4th electric capacity is Leaded Ceramic Disc Capacitor.
10. as claim 6 or 7 described testing circuits, it is characterized by: be that the dc voltage value that will sample compares with the electric current truth table of preserving in storage unit among the step a, obtain described actual current value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102804296A CN103306962A (en) | 2013-07-05 | 2013-07-05 | Protection method and detection circuit for freon shortage of compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102804296A CN103306962A (en) | 2013-07-05 | 2013-07-05 | Protection method and detection circuit for freon shortage of compressor |
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| CN103306962A true CN103306962A (en) | 2013-09-18 |
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| CN2013102804296A Pending CN103306962A (en) | 2013-07-05 | 2013-07-05 | Protection method and detection circuit for freon shortage of compressor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015058666A1 (en) * | 2013-10-24 | 2015-04-30 | 珠海格力电器股份有限公司 | Compressor overload-protection control method and device |
| CN105157295A (en) * | 2015-10-16 | 2015-12-16 | 杭州沈氏节能科技股份有限公司 | Refrigeration system and control method and control device thereof |
| CN107477773A (en) * | 2017-07-25 | 2017-12-15 | 广东美的制冷设备有限公司 | Air conditioner and its control method and control device |
| CN108050663A (en) * | 2017-12-01 | 2018-05-18 | 广东美的制冷设备有限公司 | Control method and device, air-conditioning and the storage medium of compressor self-shield |
| CN108088051A (en) * | 2017-12-01 | 2018-05-29 | 芜湖美智空调设备有限公司 | Fault detection method, air conditioner and the storage medium of cooler compressor |
| CN108451762A (en) * | 2017-02-22 | 2018-08-28 | 彭艳燕 | Intelligent moxibustion neck protective pillow |
| CN109059375A (en) * | 2018-07-30 | 2018-12-21 | 广东斯科曼制冷设备有限公司 | A kind of self-adaptive current value control method of compressor |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015058666A1 (en) * | 2013-10-24 | 2015-04-30 | 珠海格力电器股份有限公司 | Compressor overload-protection control method and device |
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| CN105157295A (en) * | 2015-10-16 | 2015-12-16 | 杭州沈氏节能科技股份有限公司 | Refrigeration system and control method and control device thereof |
| CN108451762A (en) * | 2017-02-22 | 2018-08-28 | 彭艳燕 | Intelligent moxibustion neck protective pillow |
| CN107477773A (en) * | 2017-07-25 | 2017-12-15 | 广东美的制冷设备有限公司 | Air conditioner and its control method and control device |
| CN108050663A (en) * | 2017-12-01 | 2018-05-18 | 广东美的制冷设备有限公司 | Control method and device, air-conditioning and the storage medium of compressor self-shield |
| CN108088051A (en) * | 2017-12-01 | 2018-05-29 | 芜湖美智空调设备有限公司 | Fault detection method, air conditioner and the storage medium of cooler compressor |
| CN108050663B (en) * | 2017-12-01 | 2021-04-09 | 广东美的制冷设备有限公司 | Control method and device for self-protection of compressor, air conditioner and storage medium |
| CN109059375A (en) * | 2018-07-30 | 2018-12-21 | 广东斯科曼制冷设备有限公司 | A kind of self-adaptive current value control method of compressor |
| CN109059375B (en) * | 2018-07-30 | 2020-12-01 | 广东斯科曼制冷设备有限公司 | Self-adaptive current value control method of compressor |
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Application publication date: 20130918 |