CN101639406B - Method for testing surface frosting resistance of vehicle evaporator - Google Patents
Method for testing surface frosting resistance of vehicle evaporator Download PDFInfo
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- CN101639406B CN101639406B CN 200810207612 CN200810207612A CN101639406B CN 101639406 B CN101639406 B CN 101639406B CN 200810207612 CN200810207612 CN 200810207612 CN 200810207612 A CN200810207612 A CN 200810207612A CN 101639406 B CN101639406 B CN 101639406B
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Abstract
The invention discloses a method for testing the surface frosting resistance of a vehicle evaporator. The method comprises the following steps: a refrigeration circulating system is built on a performance test platform, a thermocouple is arranged on the surface of the evaporator, a temperature controller is disconnected from a compressor clutch, the refrigeration circulating system is run, and the surface temperature of the evaporator is detected by the thermocouple; according to the on-off temperature of the temperature sensor, the temperature areas of the surface of the evaporator are regionalized, a temperature sensing packet is arranged on an initially selected position, the temperature controller is connected with the compressor clutch, the thermocouple for detecting the air-out temperature is arranged on the air outlet of an air-conditioning box, and the refrigeration circulating system is started; the on-off frequency, the pre-start exhaust temperature and the pre-close exhaust temperature of the compressor and the post-two-hour reduction percentage of outlet air volume are recorded; when the records meet the targets, the position of the temperature sensing packet is accurate; and when the records do not meet the targets, the temperature sensing packet is arranged on another position, and the test is restarted. The invention can utilize the ordinary performance test platform for accurately testing the surface frosting resistance of the vehicle evaporator.
Description
Technical field
The present invention relates to the method for testing of surface frosting resistance of vehicle evaporator, relate in particular to and be applied under no wind-tunnel condition, utilize performance test bed method of testing of carrying out surface frosting resistance of vehicle evaporator research.
Background technology
In the automotive air-conditioning system, the evaporator surface temperature is very low, so the easily frosting of surface of evaporator, especially is lower than under the lower condition of 25 ℃ and wind speed in environment temperature, and the surface of evaporator just is more prone to frosting.Behind the evaporimeter frosting, can reduce air quantity on the one hand, can reduce the heat exchange property of evaporator on the other hand, thereby have a strong impact on the vaporization of heat interchanger internal refrigeration storage agent.If heat interchanger internal refrigeration storage agent vaporization is not enough, then be still refrigerant liquid from what evaporator flowed out, will cause the compressor liquid hammer, thereby compressor is caused damage.
Generation for a series of unfavorable conditions of effectively avoiding being caused because of the evaporator surface frosting, usually be provided with bulb on the surface of evaporator, bulb is positioned at the front end of temperature sensor, bulb converts detected evaporator surface temperature signal to electrical signal transfer through temperature sensor and gives controller, and described temperature sensor and controller are formed temperature controller.When evaporator surface had certain thickness frost, the evaporator surface leaving air temp can be reduced to uniform temperature, and this moment, temperature controller cut off the working signal of compressor, stops compressor operating, thereby evaporator surface is carried out defrosting work.When the evaporator surface temperature recovery arrived uniform temperature, temperature controller was connected the working signal of compressor, recovered compressor operating.More than running is carried out repeatedly by certain frequency.
The design switching frequency of general compressor is 6 times/minute, and the serviceable life of the too frequent reduction easily of switch compressor is so the defrosting frequency of general air-conditioning system is 3-4 time/minute.Directly related with the defrosting frequency is: the switch temperature parameter of temperature controller, and the position of bulb.If the temperature controller switch temperature-difference is little, the bulb position is in low-temperature space, the frequency that then defrosts is too high, promptly is unfavorable for the serviceable life of compressor, has reduced the integrally cooling effect of system again.If the temperature controller switch temperature-difference is big, the bulb position is in the high-temperature region, residual white phenomenon then takes place easily, cause the compressor liquid hammer easily.
The setting of the setting of above-mentioned temperature controller switch temperature and bulb position all must be confirmed by the frosting resistance test.At present, the frosting resistance test all is indoor in environmental simulation test, with what carry out under the condition of car load.When the environmental simulation test indoor test, its complicated operation and expense costliness; When testing under the condition of car load, dismounting is very inconvenient, and work efficiency is low.And for large truck, because its volume is bigger, can't drives in the environmental simulation laboratory and carry out the frosting resistance test with the condition of car load, therefore need a new method that large truck is carried out the frosting resistance test.
Summary of the invention
The object of the present invention is to provide a kind of method of testing of surface frosting resistance of vehicle evaporator, this method of testing can utilize common performance test bed evaporator surface frosting resistance performance to various large and small type vehicles accurately to test, and it is simple to operate, and is easy for installation.
The present invention is achieved in that
A kind of method of testing of surface frosting resistance of vehicle evaporator may further comprise the steps:
The first step, on performance test bed, build the automobile refrigerating circulation system, condenser and compressor promptly are installed in the condenser chamber, case installs an air-conditioner in vaporization chamber, by relay the temperature controller in the air-conditioning box is connected with compressor clutch, and above-mentioned each equipment forms the automobile refrigerating circulation system by pipeline;
In second step, the evaporator surface in air-conditioning box evenly is provided with several thermopairs;
In the 3rd step, the temperature controller in the disconnection air-conditioning box is connected with compressor clutch, and the running refrigerating circulation system detects the Temperature Distribution of evaporator surfaces under specified criteria by several thermopairs;
In the 4th step, the Temperature Distribution testing result during according to the switch temperature of temperature controller and the 3rd step is set the temperature range of high-temperature region, middle warm area and the low-temperature space of evaporator surface, divides thereby evaporator surface is carried out temperature province;
In the 5th step,, bulb is placed on the position of initial option, the middle warm area of initial option evaporator surface according to the division of the switch temperature and the above-mentioned evaporator surface temperature province of temperature controller;
The 6th step connected temperature controller and compressor clutch in the air-conditioning box, was provided with a thermopair at air-conditioning box air outlet place, and this thermopair is used to measure the leaving air temp of air-conditioning box air outlet;
The 7th step started cooling cycle system, under given condition, open preceding to compressor switch frequency, compressor respectively and close the front exhaust temperature, outlet air quantity decline number percent after two hours carries out record;
The 8th step, satisfy test target as if above-mentioned compressor switching frequency, exhaust gas temperature change value, the air quantity decline number percent after two hours, represent that then the position of bulb placement is accurate; If the above-mentioned compressor switching frequency, compressor leaves preceding and close the front exhaust temperature, the outlet air quantity decline number percent after two hours does not satisfy test target, then bulb is placed on another chosen position, method according to above-mentioned the 6th, the 7th step is tested again, until the compressor switch frequency, the compressor that test out open preceding and close the front exhaust temperature, outlet air quantity decline number percent after two hours satisfies test target, bulb is placed into position accurately.
If described compressor switch frequency, compressor leaves preceding and close the front exhaust temperature, the air quantity decline number percent after two hours does not satisfy test target, also can keep the bulb invariant position, readjust the switch temperature and the switch temperature difference of temperature controller, carry out the test of evaporator surface frosting resistance according to the method in above-mentioned the 6th, the 7th step; Adjust after the switch temperature and the switch temperature difference of temperature controller, if the compressor switch frequency, compressor leaves preceding and close the front exhaust temperature, the outlet air quantity decline number percent after two hours satisfies test target, then be illustrated under the temperature controller switch temperature of this new adjustment, the position that bulb is placed is accurate.
Described test target comprises that the compressor switch frequency is in 6 times/minute; Before compressor leaves and pass front exhaust temperature is lower than 12 ℃; After two hours, the reduction amount that blows out air quantity is in 10%.
Described evaporator surface in air-conditioning box evenly is provided with 12 thermopairs.
The invention provides a kind of method of testing of surface frosting resistance of vehicle evaporator, this method of testing mainly is to utilize common to build the automobile refrigerating circulation system on performance test bed, evaporator surface in this system is carried out the frosting resistance test, thereby replaced existing in the environmental simulation laboratory, to carry out the method for testing of frosting resistance test under the condition of car load.Can accurately locate the position of evaporator surface bulb by method of testing of the present invention, thereby avoid because of the defrosting frequency too high or defrosting underfrequency the damage of vehicle compressor, the reduction of air-conditioning system performance.Method of testing of the present invention can utilize common performance test bed evaporator surface frosting resistance to various large and small type vehicles accurately to test, and it is simple to operate, and is easy for installation.
Description of drawings
Fig. 1 is automobile refrigerating circulation system synoptic diagram in the method for testing of surface frosting resistance of vehicle evaporator of the present invention;
Fig. 2 is for being provided with the automobile evaporator surface structure synoptic diagram of thermopair among the present invention;
Fig. 3 is for being provided with the automobile evaporator surface structure synoptic diagram of bulb among the present invention.
Among the figure: condenser chamber 1,2 vaporization chambers, 3 condensers, 4 compressors, 5 air-conditioning boxs, 6 clutch couplinges, 7 relays, 8 temperature controllers, 9 pipelines, 10 evaporators, 11 thermopairs, 12 bulb, 13 temperature-sensitive positions.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
A kind of method of testing of surface frosting resistance of vehicle evaporator may further comprise the steps:
The first step, on performance test bed, build the automobile refrigerating circulation system, condenser 3 and compressor 4 promptly are installed in condenser chamber 1, case 5 installs an air-conditioner in vaporization chamber 2, by relay 7 temperature controller 8 in the air-conditioning box 5 is connected with compressor 4 clutch couplinges 6, and above-mentioned each equipment forms the automobile refrigerating circulation system by pipeline 9, referring to Fig. 1;
In second step, evaporator 10 surfaces in air-conditioning box 5 evenly are provided with 12 thermopairs 11, referring to Fig. 2;
In the 3rd step, the temperature controller 8 in the disconnection air-conditioning box 5 is connected with compressor 4 clutch couplinges 6, and the running refrigerating circulation system detects the Temperature Distribution of evaporator 10 surfaces under following specified criteria by 12 thermopairs 11;
Concrete specified criteria is as shown in table 1:
Table 1:
According to table 1 given condition, the temperature on 12 thermopair 11 detected evaporators 10 surfaces, its concrete data are shown in table 2, table 3:
Table 2 is at compressor 4 revolution 2000rpm, temperature, humidity 20degC*80%, and under the situation of air quantity 15.5V MH, 12 thermopair 11 detected evaporator 10 surface temperature distribution: (unit: ℃)
Table 2:
| -0.6? | -0.4? | 1.9? | 3.9? |
| -1? | -0.7? | 2? | 6.7? |
| -1.2? | 0.6? | 4.3? | 7.3? |
Table 3 is at compressor 4 revolution 2000rpm, temperature, humidity 20degC*80%, and under the situation of air quantity 24V H, 12 thermopair 11 detected evaporator 10 surface temperature distribution: (unit: ℃)
Table 3:
| 3.5? | 5.2? | 6.7? | 10.5? |
| 2.8? | 4.5? | 7.2? | 11.5? |
| 2.4? | 5.6? | 9.4? | 11.9? |
The 4th step, Temperature Distribution testing result during according to the switch temperature of temperature controller 8 and the 3rd step is set the temperature range of high-temperature region, middle warm area and the low-temperature space on evaporator 10 surfaces, divide thereby temperature province is carried out on evaporator 10 surfaces, promptly the temperature shown in above-mentioned table 2, the table 3 is carried out area dividing;
The 5th step according to the switch temperature and the above-mentioned evaporator 10 surface temperature dividing region of temperature controller 8, was placed on the position of initial option with bulb 12, and the front end of bulb 12 is temperature-sensitive position 13, referring to Fig. 3;
The 6th step connected temperature controller 8 and compressor 4 clutch couplinges 6 in the air- conditioning box 5, and 5 air outlet places are provided with the another one thermopair at air-conditioning box, and this thermopair is used to measure the leaving air temp of air-conditioning box 5 air outlets;
The 7th step started cooling cycle system, under the specified criteria shown in the table 1, open preceding to compressor 4 switching frequencies, compressor 4 respectively and close the front exhaust temperature, outlet air quantity decline number percent after two hours carries out record;
Physical record numerical value sees Table 4:
Table 4:
Three test targets are respectively:
(1) compressor 4 switching frequencies are in 6 times/minute;
(2) behind the 2H, the reduction amount that blows out air quantity is in 10%;
(3) during compressor 4 switches, before leaving, compressor 4 is lower than 12 ℃ with pass front exhaust temperature.
Data presentation according to table 4, can obtain: under the given condition of above-mentioned table 1, the position that this bulb 12 is placed is accurate position, need not the position of bulb 12 is adjusted, its compressor 4 switching frequencies, compressor 4 are opened preceding and pass front exhaust temperature, the outlet air quantity decline number percent after two hours all satisfy above-mentioned test target.
The present invention can utilize common performance test bed evaporator surface frosting resistance to various large and small type vehicles accurately to test, and it is simple to operate, and is easy for installation.
Claims (4)
1. the method for testing of a surface frosting resistance of vehicle evaporator, it is characterized in that: described method of testing may further comprise the steps:
The first step, on performance test bed, build the automobile refrigerating circulation system, condenser and compressor promptly are installed in the condenser chamber, case installs an air-conditioner in vaporization chamber, by relay the temperature controller in the air-conditioning box is connected with compressor clutch, and above-mentioned each equipment forms the automobile refrigerating circulation system by pipeline;
In second step, the evaporator surface in air-conditioning box evenly is provided with several thermopairs;
In the 3rd step, the temperature controller in the disconnection air-conditioning box is connected with compressor clutch, and the running refrigerating circulation system detects the Temperature Distribution of evaporator surfaces under specified criteria by several thermopairs;
In the 4th step, the Temperature Distribution testing result during according to the switch temperature of temperature controller and the 3rd step is set the temperature range of high-temperature region, middle warm area and the low-temperature space of evaporator surface, divides thereby evaporator surface is carried out temperature province;
In the 5th step,, bulb is placed on the position of initial option, the middle warm area of initial option evaporator surface according to the division of the switch temperature and the above-mentioned evaporator surface temperature province of temperature controller;
The 6th step connected temperature controller and compressor clutch in the air-conditioning box, was provided with a thermopair at air-conditioning box air outlet place, and this thermopair is used to measure the leaving air temp of air-conditioning box air outlet;
The 7th step started cooling cycle system, under given condition, open preceding to compressor switch frequency, compressor respectively and close the front exhaust temperature, air quantity decline number percent after two hours carries out record;
The 8th step, satisfy test target as if above-mentioned compressor switching frequency, exhaust gas temperature change value, the air quantity decline number percent after two hours, represent that then the position of bulb placement is accurate; If the above-mentioned compressor switching frequency, compressor leaves preceding and close the front exhaust temperature, the air quantity decline number percent after two hours does not satisfy test target, then bulb is placed on another chosen position, method according to above-mentioned the 6th, the 7th step is tested again, until the compressor switch frequency, the compressor that test out open preceding and close the front exhaust temperature, outlet air quantity decline number percent after two hours satisfies test target, bulb is placed into position accurately.
2. the method for testing of surface frosting resistance of vehicle evaporator according to claim 1, it is characterized in that: if described compressor switch frequency, compressor leaves preceding and close the front exhaust temperature, the air quantity decline number percent after two hours does not satisfy test target, also can keep the bulb invariant position, readjust the switch temperature and the switch temperature difference of temperature controller, carry out the test of evaporator surface frosting resistance according to the method in above-mentioned the 6th, the 7th step; Adjust after the switch temperature and the switch temperature difference of temperature controller, if the compressor switch frequency, compressor leaves preceding and close the front exhaust temperature, the outlet air quantity decline number percent after two hours satisfies test target, then be illustrated under the temperature controller switch temperature of this new adjustment, the position that bulb is placed is accurate.
3. the method for testing of surface frosting resistance of vehicle evaporator according to claim 1 and 2, it is characterized in that: described test target comprises that the compressor switch frequency is in 6 times/minute; Before compressor leaves and pass front exhaust temperature is lower than 12 ℃; After two hours, the reduction amount that blows out air quantity is in 10%.
4. the method for testing of surface frosting resistance of vehicle evaporator according to claim 1, it is characterized in that: described evaporator surface in air-conditioning box evenly is provided with 12 thermopairs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810207612 CN101639406B (en) | 2008-12-23 | 2008-12-23 | Method for testing surface frosting resistance of vehicle evaporator |
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| CN 200810207612 CN101639406B (en) | 2008-12-23 | 2008-12-23 | Method for testing surface frosting resistance of vehicle evaporator |
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| CN101639406A CN101639406A (en) | 2010-02-03 |
| CN101639406B true CN101639406B (en) | 2011-03-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103712802A (en) * | 2014-01-09 | 2014-04-09 | 神龙汽车有限公司 | Finished automobile air conditioner refrigeration performance test method |
| CN109186921A (en) * | 2018-09-17 | 2019-01-11 | 江西江铃集团新能源汽车有限公司 | Air conditioner of electric vehicle evaporator icing tests method |
| JP6641439B1 (en) * | 2018-09-26 | 2020-02-05 | 株式会社Ｓｕｂａｒｕ | Electromagnetic relay deicing system |
| CN111912086A (en) * | 2020-01-12 | 2020-11-10 | 贺宝平 | Optimization method for position of temperature sensor at air inlet of cylindrical vertical air conditioner |
| CN116517866B (en) * | 2023-06-19 | 2023-09-08 | 中国航空工业集团公司沈阳空气动力研究所 | In-plant test device and method for main compressor of continuous transonic wind tunnel |
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Address after: 201204 Pudong New Area South Road, Shanghai, No. 1768 Patentee after: Shanghai Aisidake Automotive Air Conditioning Systems Co. Address before: 201204 Pudong South Road, Shanghai, No. 1768 Patentee before: Deerfu Automotive Air-Conditioner System Co., Ltd., Shanghai |
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Granted publication date: 20110330 Termination date: 20191223 |
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