CN201400072Y - Vehicle air conditioner - Google Patents
Vehicle air conditioner Download PDFInfo
- Publication number
- CN201400072Y CN201400072Y CN2009201352464U CN200920135246U CN201400072Y CN 201400072 Y CN201400072 Y CN 201400072Y CN 2009201352464 U CN2009201352464 U CN 2009201352464U CN 200920135246 U CN200920135246 U CN 200920135246U CN 201400072 Y CN201400072 Y CN 201400072Y
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- 239000003507 refrigerant Substances 0.000 claims description 28
- 238000004378 air conditioning Methods 0.000 claims description 23
- 239000002826 coolant Substances 0.000 claims description 15
- 230000000052 comparative effect Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 239000000284 extract Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Air-Conditioning For Vehicles (AREA)
Abstract
The utility model relates to a vehicle air conditioner, in particular to the field of vehicle air conditioner poor vacuum detection. The utility model provides a vehicle air conditioner which is provided with a poor vacuum detection device and has the convenient operation for the weakness of inconvenience of poor vacuum detection in the prior art. The utility model adopts the technical scheme thatpressures on a high-pressure side and a low-pressure side of an air conditioner compressor are detected by a sensing unit, and then are compared with a standard high-pressure value and a standard lowpressure value preset in a controller, an alarm can warn and prompt that the vacuum degree of the air conditioner has bad condition when the compared result exceeds a preset deviation value, therebyprompting vehicle owners or maintainers to repair and maintain the air conditioner.
Description
[technical field]
The utility model relates to a kind of car air-conditioner, relates in particular to a kind of car air-conditioner that comprises the vacuum error detecting device.
[background technology]
As shown in Figure 1, a traditional automobile air conditioning refrigerating system is made up of compressor 100, condenser 200, drier receiver 300, expansion valve 400, evaporator 500 and blowing engine 600 etc.Adopt copper pipe, aluminum pipe or high-pressure rubber hose to connect into a closed system between each parts as link.During refrigeration system work, refrigerant circulates in this closed system with different states.Its concrete cyclic process is: compressor 100 is compressed into the High Temperature High Pressure gaseous coolant with the low-temp low-pressure gaseous coolant; Then, the gaseous coolant of High Temperature High Pressure becomes the high-temperature liquid state refrigerant at condenser 200 places; Drier receiver 300 is removed moisture in the liquid refrigerants and impurity; The high-pressure liquid refrigerant becomes the low pressure atomized refrigerant after by expansion valve 400; The low pressure atomized refrigerant absorbs heat and becomes gaseous refrigerant evaporator 500 surface temperatures are descended in evaporator 500 then, by blowing engine 600 cold wind is delivered in the compartment; Gaseous coolant is sucked by compressor 100 again.From top cyclic process as can be seen, refrigerant plays crucial effects in air conditioner refrigerating.
When car air-conditioner is installed or keep in repair, need fill or coolant adding, when being injected into refrigerant in the refrigerant pipe, a/c system is inner must to keep vacuum state, and when real work, residual in the air-conditioning duct air is arranged because the improper grade of work causes probably, and mix together with refrigerant; Because airborne water vapour has icing possibility when low temperature, just be easy to stop up expansion valve in case freeze, cause that system pressure is too high, poor refrigerating efficiency even can't work, simultaneously because air has occupied the volume of refrigerant, thereby reduce the refrigeration of air-conditioning.In the prior art detection of air-conditioning degree of vacuum is just detected its vacuum state with an independently special-purpose vacuum detection instrument after filling refrigerant, inconvenient operation during its detection can not directly obtain the degree of vacuum state of air-conditioning.
[utility model content]
The technical matters that the utility model solves is for providing a kind of detection air-conditioning degree of vacuum easy to operate car air-conditioner.
In order to address the above problem, the technical scheme of employing is:
A kind of car air-conditioner comprises compressor, and described car air-conditioner also comprises the vacuum error detecting device, and described vacuum error detecting device comprises:
Sensing unit, described sensing unit comprises pressure sensor, is used to gather pressure signal, described pressure sensor comprises the low-pressure lateral pressure sensor that is arranged on compressor inlet duct and the high side pressure sensor of compressor outlet pipeline;
Controller, be used for the signal of described sensing unit collection is handled, described controller comprises signal processing unit and is preset with the standard high-voltage value and the judging unit of standard low pressure value, described signal processing unit all links to each other with described high side pressure sensor with described low-pressure lateral pressure sensor, and described pressure signal is carried out filtering and modulus handle, the actual high-voltage value and the actual low voltage value that extract the most at last are transferred to judging unit, described judging unit is respectively with the actual high-voltage value, actual low voltage value and standard high-voltage value, the standard low pressure value compares, and obtains comparative result;
Annunciator links to each other with judging unit, and sends the vacuum error warning according to the comparative result of described judging unit.
After adopting such structure, at first, gather the actual low-voltage signal of on high-tension side actual high-voltage signal of air-conditioning compressor and low pressure side by low-pressure lateral pressure sensor in the sensing unit and high side pressure sensor, signal processing unit in the described controller then carries out filtering and modulus processing to described actual high-voltage signal and actual low-voltage signal, thereby obtain actual high-voltage value and actual low voltage value, and actual high-voltage value and actual low voltage value be transferred to judging unit, and be preset with standard high-voltage value and standard low pressure value in the judging unit, by respectively to above-mentioned actual high-voltage value, actual low voltage value and standard high-voltage value, the standard low pressure value compares, when described actual high-voltage value, actual low voltage value departs from described standard high-voltage value, the deviation of standard low pressure value is during greater than the standard deviation value that is preset in the judging unit, described annunciator is reported to the police, and reports to the police to show that then air-conditioning degree of vacuum does not reach standard.
[description of drawings]
Fig. 1 is the fundamental diagram of car air-conditioner in the prior art;
Fig. 2 is the fundamental diagram of a kind of car air-conditioner embodiment of the utility model;
Fig. 3 is that a kind of car air-conditioner embodiment of the utility model is in operative condition and carries out the fundamental diagram of degree of vacuum when detecting;
Fig. 4 is the fundamental diagram of a kind of car air-conditioner embodiment of the utility model when being in operative condition and comprising protected location.
Fig. 5 is the fundamental diagram of a kind of car air-conditioner embodiment of the utility model when carrying out Density Detection.
Fig. 6 is that a kind of car air-conditioner embodiment of the utility model carries out the fundamental diagram of Density Detection when comprising protected location.
[specific embodiment]
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The embodiment of a kind of car air-conditioner that provides as the utility model, as shown in Figure 2, described car air-conditioner comprises by compressor 100, condenser 200, liquid storage dryer 300, expansion valve 400, evaporator 500, the air-conditioning basic system that blowing engine 600 constitutes, the function of concrete each several part belongs to art technology, just do not do description at this, in the utility model embodiment, described car air-conditioner also comprises detecting device, be the vacuum error detecting device specifically, described detecting device comprises sensing unit (not looking out among the figure), described sensing unit comprises the pressure sensor that is used to gather pressure signal, specifically, as shown in Figure 2, described pressure sensor comprises the on high-tension side high side pressure sensor 112 that is installed in compressor 100, it is used to detect compressor 100 on high-tension side pressure signals, the exhausr port that the high pressure side of described compressor 100 is compressor 100 is an outlet side, in Fig. 2, described high side pressure sensor 112 is arranged between compressor 100 and the condenser 200, described pressure sensor also comprises the low-pressure lateral pressure sensor 111 of the low pressure side that is installed in compressor 100 simultaneously, it is used to detect the pressure signal of compressor 100 low pressure sides, the low pressure side of described compressor 100 is that the admission port of compressor 100 is an entrance side, in Fig. 2, described low-pressure lateral pressure sensor 111 is arranged between blowing engine 600 and the compressor 100.
Described detecting device also comprises and is used for the controller 130 that described sensing unit acquired signal is handled and receives the annunciator 140 that controller signals plays the warning effect, described controller 130 comprises signal processing unit 131 and judging unit 132, described judging unit 132 is preset with standard high-voltage value and standard low pressure value, described default standard high-voltage value and standard low pressure value are good in air-conditioning degree of vacuum, and the force value of the compressor pressure duct under the out-of-run situation and the force value of compressor low pressure line, the basic feature decision that its concrete value is a car air-conditioner itself, it is a steady state value.Described signal processing unit 131 all links to each other with described high side pressure sensor 112 with described low-pressure lateral pressure sensor 111, and the pressure signal that described low-pressure lateral pressure sensor 111 and high side pressure sensor 112 gathered carries out analyzing and processing and obtains the actual high-voltage value and actual low voltage value, concrete analyzing and processing comprises filtering and modulus processing, concrete filtering mode and modulus are treated to techniques well known, do not do detailed description at this, described signal processing unit 131 is transferred to judging unit 132 with actual high-voltage value and actual low voltage value, described judging unit 132 compares actual high-voltage value and standard high-voltage value, obtain comparative result, and comparative result is transferred to annunciator 140, if nonconformity, then annunciator 140 is reported to the police, judging unit 132 also compares actual low voltage value and standard low pressure value simultaneously, obtain comparative result, and comparative result is transferred to annunciator 140, if nonconformity, then annunciator 140 sends vacuum error and reports to the police.
Described detecting device also comprises annunciator 140, described annunciator 140 links to each other with judging unit 132 and receives the comparative result of described judging unit 132, if comparative result is not for reaching vacuum standard, then report to the police, concrete type of alarm can adopt this area technological means commonly used, as a kind of embodiment, this annunciator is the LED display circuit, and this LED display circuit is arranged on the car air-conditioner panel.When not reaching vacuum standard, the LED lamp is bright, thus the prompting occupant.This annunciator can also be buzz circuit, and when not reaching vacuum standard, buzz circuit is activated, and points out the occupant thereby produce buzzing.
As a kind of concrete manner of comparison, in described judging unit 132, also be preset with standard deviation value, described manner of comparison is for deducting 1 with the actual high-voltage value again divided by after the standard high-voltage value, thereby obtain the actual deviation value, when described actual deviation value overgauge deviate, 132 of described judging units send the warning drive signal to annunciator 140, and annunciator 140 is reported to the police, described manner of comparison is identical with high-voltage value to the processing mode of low voltage value, is not repeated in this description so do not do.
Standard high-voltage value and standard low pressure value default in the above-mentioned judging unit 132 can only satisfy in the out-of-run situation of air-conditioning, in order in the use of air-conditioning, to carry out the detection of vacuum error, because the residing environment of air-conditioning can influence the force value of compressor high pressure side and low pressure side, simultaneously different environment can determine different reference high-voltage values and with reference to low voltage value, described with reference to high-voltage value be in the low voltage value of the vacuum state on high-tension side high-voltage value of compressor and compressor low pressure side when good for air-conditioning under concrete environment with reference to low voltage value, in order to obtain the concrete operations condition value of car air-conditioner, as shown in Figure 3, so described sensing unit also comprises the temperature sensor that is used for the collecting temperature signal, described temperature sensor comprises the vehicle interior temperature sensor 113 of collection vehicle internal temperature and gathers the outer temperature sensor 114 of car of car external environment temperature, described vehicle inside temperature is meant the temperature of air in the enclosure space that forms after the car door sealing, and the external temperature of described vehicle is meant the temperature of car outer air behind the vehicle closed door, described sensing unit also comprises tachogen 115 that is used to gather the air-conditioning compressor rotating speed and the coolant quantity sensor 116 of gathering the real work coolant quantity, described signal processing unit 131 and described vehicle interior temperature sensor 113, the outer temperature sensor 114 of car, tachogen 115 and coolant quantity sensor 116 all link to each other, and temperature signal to obtaining, tach signal and coolant quantity signal are handled, described processing comprises filtering, the mode that this areas such as amplification and modulus are commonly used, thereby obtain concrete temperature value, tachometer value and refrigerant value, described refrigerant value is a mass value, described signal processing unit 131 also comprises the calculating part 1311 that is preset with the reference pressure table, the table of described reference pressure table for prestoring according to the parameter of concrete air-conditioning etc., specifically, described reference pressure table comprises independent variable unit and part as a result, described independent variable unit is car internal and external temperature value, tachometer value, the refrigerant value, described result partly is with reference to high-voltage value, with reference to low voltage value, described reference pressure table is specially tableau format, it is according to concrete air-conditioning parameter and different, it is the table that obtains in conjunction with observed data, described calculating part 1311 is according to car internal and external temperature value, tachometer value, refrigerant value and in conjunction with the reference pressure table, and determine with reference to high-voltage value with reference to low voltage value, when actual high-voltage value and standard high-voltage value are compared, the standard high-voltage value then adopts with reference to high-voltage value, as a kind of preferred embodiment, and will cover standard high-voltage value and standard low pressure value default in the judging unit with reference to high-voltage value with reference to low voltage value.
Surpass the maximum rated force value that air-conditioning duct can bear in order to prevent that the actual high-voltage value is too high; and cause the damage of air-conditioning; as shown in Figure 4; described judging unit 132 also is preset with the rated pressure value that air-conditioning duct can bear; described detecting device also comprises protected location 150; described protected location 150 all links to each other with described compressor 100 with described judging unit 132; the actual high-voltage value that extracts when described signal processing unit 131 is during greater than described maximum rated force value, and the described compressor of described protected location 150 controls quits work.
Be in the off-duty state at air-conditioning, whether secondary refrigerant leakage takes place in order to detect car air-conditioner, as shown in Figure 5, described sensing unit also comprises the density sensor 117 of gathering the refrigerant density signal, described density sensor 117 is used to gather the density signal of refrigerant, described signal processing unit 131 links to each other with density sensor 117, and density signal handled, describedly be treated to this area amplification commonly used, mode such as filtering and analogue to digital conversion, and obtain concrete density value, described judging unit 132 is preset with the standard density value, and described actual density value and standard density value compared, obtain comparative result, obtain the actual deviation value, described judging unit 132 also is preset with standard deviation value, when described actual deviation value during greater than described standard deviation value, annunciator 140 is reported to the police, and the LED lamp that two or more warnings can be set specifically is set, comprising show vacuum error with show secondary refrigerant leakage.
Concrete, described density sensor 117 can be arranged on the suction port of compressor, be used to detect the density of liquid refrigerants this moment, described density sensor 117 can also be arranged on compressor 100 outlets, be used to detect the density of gaseous coolant this moment, when concrete selection is liquid state or gaseous state, only need adjust the size of default standard density value.
When dashing the notes refrigerant; the refrigerant density that too much causes in order to prevent from dash to annotate refrigerant is excessive and damage car air-conditioner; also be preset with the maximum rated density value that air-conditioning duct can bear in the described judging unit 132; described detecting device also comprises protected location 150; described protected location 150 all links to each other with described compressor 100 with described judging unit 132; the actual density value that extracts when described signal processing unit 131 is during greater than described maximum rated density value, and the described compressor 100 of described protected location 150 controls quits work.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; under the prerequisite that does not break away from the utility model design; can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the utility model is determined by claims of being submitted to.
Claims (7)
1, a kind of car air-conditioner comprises compressor, it is characterized in that, described car air-conditioner also comprises the vacuum error detecting device, and described vacuum error detecting device comprises:
Sensing unit, described sensing unit comprises pressure sensor, is used to gather pressure signal, described pressure sensor comprises the low-pressure lateral pressure sensor that is arranged on compressor inlet duct and the high side pressure sensor of compressor outlet pipeline;
Controller, be used for the signal of described sensing unit collection is handled, described controller comprises signal processing unit and is preset with the standard high-voltage value and the judging unit of standard low pressure value, described signal processing unit all links to each other with described high side pressure sensor with described low-pressure lateral pressure sensor, and described pressure signal is carried out filtering and modulus handle, the actual high-voltage value and the actual low voltage value that extract the most at last are transferred to judging unit, described judging unit links to each other with signal processing unit, and respectively with the actual high-voltage value that receives, actual low voltage value and standard high-voltage value, the standard low pressure value compares, and obtains comparative result;
Annunciator links to each other with judging unit, and sends the vacuum error warning according to the comparative result of described judging unit.
2, a kind of car air-conditioner as claimed in claim 1 is characterized in that, described sensing unit also comprises:
Temperature sensor is used for the collecting temperature signal, and described temperature sensor comprises the vehicle interior temperature sensor car outer temperature sensor outer with being arranged on car that is arranged in the car;
Tachogen is used to gather the tach signal of air-conditioning compressor;
The coolant quantity sensor is used to gather actual coolant quantity;
Described signal processing unit all links to each other with described vehicle interior temperature sensor, the outer temperature sensor of car, tachogen and coolant quantity sensor, and temperature signal, tach signal and coolant quantity signal handled respectively, described signal processing unit also comprises and is preset with reference pressure table and the car internal and external temperature value that obtains according to signal processing unit, tachometer value, refrigerant value and draws with reference to high-voltage value with reference to the calculating part of low voltage value in conjunction with the reference pressure table.
3, a kind of car air-conditioner as claimed in claim 1 or 2; it is characterized in that, when described detecting device also comprises the actual high-voltage value that all links to each other with described compressor with described judging unit and extract when signal processing unit greater than the maximum rated force value that is pre-stored in the judging unit and control the out-of-work protected location of described compressor.
4, a kind of car air-conditioner as claimed in claim 1 or 2 is characterized in that, described annunciator is the LED display circuit that is arranged on the car air-conditioner panel.
5, a kind of car air-conditioner as claimed in claim 1 is characterized in that, described sensing unit also comprises the density sensor of gathering the refrigerant density signal, and described signal processing unit links to each other with density sensor and the actual density value that obtains is passed to judging unit.
6, a kind of car air-conditioner as claimed in claim 4, it is characterized in that described density sensor comprises that being arranged on the place, suction port of compressor is used to detect the liquid density sensor of liquid refrigerants density or is arranged on the gaseous density sensor that the compressor outlet place is used to detect gaseous coolant density.
7, a kind of car air-conditioner as claimed in claim 5; it is characterized in that, when described detecting device also comprises the actual density value that all links to each other with described compressor with described judging unit and extract when described signal processing unit greater than the maximum rated density value that is pre-stored in the judging unit and control the out-of-work protected location of described compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201352464U CN201400072Y (en) | 2009-02-27 | 2009-02-27 | Vehicle air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201352464U CN201400072Y (en) | 2009-02-27 | 2009-02-27 | Vehicle air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201400072Y true CN201400072Y (en) | 2010-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201352464U Expired - Lifetime CN201400072Y (en) | 2009-02-27 | 2009-02-27 | Vehicle air conditioner |
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| Country | Link |
|---|---|
| CN (1) | CN201400072Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874071A (en) * | 2012-10-20 | 2013-01-16 | 杭州祥和实业有限公司 | Coach air conditioning with hose convenient to mount |
| CN108312866A (en) * | 2018-01-30 | 2018-07-24 | 宁波国创机车装备有限公司 | A kind of power battery cooling heating management system and power battery |
| CN109099555A (en) * | 2018-08-21 | 2018-12-28 | 宁波奥克斯电气股份有限公司 | A kind of vacuum degree measurement judgment method, device and air conditioner |
| CN109203914A (en) * | 2018-11-12 | 2019-01-15 | 浙江众泰汽车制造有限公司 | A kind of electric automobile air conditioner electric compressor machine control system and its control method |
| CN109210672A (en) * | 2018-08-01 | 2019-01-15 | 珠海格力电器股份有限公司 | Control method and device for outdoor fan, outdoor fan and air conditioning system |
| CN109406068A (en) * | 2018-12-11 | 2019-03-01 | 上海松芝酷能汽车技术有限公司 | Vehicle air-conditioner evaporator core detection device and detection method |
| CN110553787A (en) * | 2019-09-06 | 2019-12-10 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Pressure early warning device for automobile air conditioner |
| CN111288595A (en) * | 2018-12-10 | 2020-06-16 | 李守雄 | Cleaning device for refrigeration air-conditioning system without condenser, expansion valve and capillary tube |
-
2009
- 2009-02-27 CN CN2009201352464U patent/CN201400072Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874071A (en) * | 2012-10-20 | 2013-01-16 | 杭州祥和实业有限公司 | Coach air conditioning with hose convenient to mount |
| CN108312866A (en) * | 2018-01-30 | 2018-07-24 | 宁波国创机车装备有限公司 | A kind of power battery cooling heating management system and power battery |
| CN109210672A (en) * | 2018-08-01 | 2019-01-15 | 珠海格力电器股份有限公司 | Control method and device for outdoor fan, outdoor fan and air conditioning system |
| CN109210672B (en) * | 2018-08-01 | 2019-09-10 | 珠海格力电器股份有限公司 | Control method and device for outdoor fan, outdoor fan and air conditioning system |
| WO2020024528A1 (en) * | 2018-08-01 | 2020-02-06 | 珠海格力电器股份有限公司 | Outdoor fan control method and device, and outdoor fan and air conditioner system |
| CN109099555A (en) * | 2018-08-21 | 2018-12-28 | 宁波奥克斯电气股份有限公司 | A kind of vacuum degree measurement judgment method, device and air conditioner |
| CN109099555B (en) * | 2018-08-21 | 2019-10-29 | 宁波奥克斯电气股份有限公司 | A kind of vacuum degree measurement judgment method, device and air conditioner |
| CN109203914A (en) * | 2018-11-12 | 2019-01-15 | 浙江众泰汽车制造有限公司 | A kind of electric automobile air conditioner electric compressor machine control system and its control method |
| CN111288595A (en) * | 2018-12-10 | 2020-06-16 | 李守雄 | Cleaning device for refrigeration air-conditioning system without condenser, expansion valve and capillary tube |
| CN111288595B (en) * | 2018-12-10 | 2022-02-25 | 李守雄 | Cleaning device for refrigeration air-conditioning system without condenser, expansion valve and capillary tube |
| CN109406068A (en) * | 2018-12-11 | 2019-03-01 | 上海松芝酷能汽车技术有限公司 | Vehicle air-conditioner evaporator core detection device and detection method |
| CN110553787A (en) * | 2019-09-06 | 2019-12-10 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Pressure early warning device for automobile air conditioner |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
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Granted publication date: 20100210 |