CN102645327B - Method for detecting welding blockage of electronic outdoor unit expansion valves of multi-coupled air-conditioning unit - Google Patents
Method for detecting welding blockage of electronic outdoor unit expansion valves of multi-coupled air-conditioning unit Download PDFInfo
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- CN102645327B CN102645327B CN201210095097.XA CN201210095097A CN102645327B CN 102645327 B CN102645327 B CN 102645327B CN 201210095097 A CN201210095097 A CN 201210095097A CN 102645327 B CN102645327 B CN 102645327B
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Abstract
The invention discloses a method for detecting the welding blockage of electronic outdoor unit expansion valves of a multi-coupled air-conditioning unit. The method includes the following steps: (a) a compressor (1) of the outdoor unit is operated under the heating mode for at least two minutes; (b) the difference DeltaT1 between a suction temperature T1 and an outdoor temperature T0, the difference DeltaT2 between the temperature T2 of the middle section of the coil of an outdoor heat exchanger (2) and the outdoor temperature T0 and the difference DeltaT3 between defrosting temperature T3 and the outdoor temperature T0 are detected and calculated; (c) whether DeltaT1, DeltaT2, DeltaT3 are less than or equal to 3 is judged and a low-voltage outdoor unit pressure switch (3) is switched off; if the conditions are met, then the complete welding blockage of the electronic outdoor unit expansion valve (4) is determined, and the detection process is terminated; and if the conditions are not met, then the next step is carried out; (d) the compressor (1) of the outdoor unit is continuously operated for at least four minutes; (e) whether T3' is lower than or equal to negative 15 DEG C is judged and the low-voltage outdoor unit pressure switch (3) is switched off, and if the conditions are met, then the partial welding blockage of the electronic outdoor unit expansion valve (4) is determined. The detection method is rapid, convenient and accurate.
Description
Technical field
The present invention relates to VRF Air Conditioning System, is specifically whether a kind of outer organic electronic expansion valve of VRF Air Conditioning System welds stifled detection method.
Background technology
The VRF Air Conditioning System of prior art comprises one or more off-premises station, multiple indoor set parallel with one another and connects two refrigerant circulation house stewards of each indoor set and each off-premises station.If off-premises station is one, this off-premises station is communicated with the multiple indoor sets after parallel connection by two refrigerant circulation house stewards; If off-premises station is multiple, then multiple off-premises station is in parallel, and the off-premises station after parallel connection is communicated with the indoor set after parallel connection by two refrigerant circulation house stewards.
Each off-premises station comprises compressor, oil separator, four-way change-over valve, outdoor heat exchanger (being evaporator during heating mode), outer organic electronic expansion valve, reservoir and gas-liquid separator.Compressor outlet is communicated with one end of oil separator, the other end of oil separator is communicated with the first valve port of four-way change-over valve, the refrigerant pipe that 3rd valve port and two refrigerants of four-way change-over valve circulate in house steward is communicated with, another root refrigerant pipe in two refrigerant circulation house stewards is communicated with one end of reservoir, the other end of reservoir is communicated with one end of outer organic electronic expansion valve, the outer other end of organic electronic expansion valve is communicated with one end of outdoor heat exchanger, the other end of outdoor heat exchanger is communicated with the second valve port of four-way change-over valve, 4th valve port of four-way change-over valve is communicated with one end of gas-liquid separator, the other end of gas-liquid separator is communicated with suction port of compressor.During heating mode, the first valve port of four-way change-over valve is communicated with the 3rd valve port, and the second valve port is communicated with the 4th valve port, and namely refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, the circulation of this route of compressor.
Each indoor set comprises interior organic electronic expansion valve and indoor heat exchanger (being condenser during heating mode), one end of indoor heat exchanger is communicated with one end of interior organic electronic expansion valve, one that the other end and two refrigerants of interior organic electronic expansion valve circulate in house steward is communicated with, and another root refrigerant pipe that the other end and two refrigerants of indoor heat exchanger circulate in house steward is communicated with.
This VRF Air Conditioning System is provided with measures outdoor temperature T
othe 4th temperature sensor; The suction port of compressor place of each off-premises station is provided with the first temperature sensor, and the first temperature sensor is for measuring temperature and the suction temperature T at suction port of compressor place
1; The coil pipe stage casing of the outdoor heat exchanger of each off-premises station is provided with the second temperature sensor, and the second temperature sensor is used for the coil pipe stage casing temperature T of measuring chamber external heat exchanger
2; The porch of the outdoor heat exchanger of each off-premises station is provided with three-temperature sensor, and three-temperature sensor is used for the temperature in T of measuring chamber external heat exchanger
3, this temperature in T
3in industry, custom is referred to as the temperature T3 that defrosts; The pipeline at the close suction port of compressor place of each off-premises station is provided with off-premises station low pressure switch; Four above-mentioned temperature sensors and off-premises station low pressure switch are electrically connected with the master controller of air-conditioning.
When VRF Air Conditioning System heats, outer organic electronic expansion valve, as the throttle device of system, by regulating aperture size, accurately controls the flow of cold-producing medium, control temperature exactly.And outer organic electronic expansion valve is on the pipeline of unit by human weld, and the inlet pipe of outer organic electronic expansion valve is no more than 6mm with the internal diameter going out pipe, like this, there will be the situation that weldering is stifled unavoidably, once there is the situation that weldering is stifled, the front end report high voltage fault of outer organic electronic expansion valve, rear end report low voltage failure will be caused.Because outer organic electronic expansion valve and system pipeline are welded, cannot whether weld stifled by direct-detection at all, other failure cause can only be investigated one by one, if be not just finally determine that weldering is stifled.But cause air-conditioning to offer a high price and press and report the reason of low voltage failure to have a lot, rotation speed of fan as outer machine, interior machine is not enough, the coil pipe of heat interchanger blocks, heat exchanger coils shows to be stained with the kapillary blocking etc. that ash makes heat exchange quantity not sufficient, heat exchanger coils end, therefore each weldering is stifled when causing offering a high price pressure and low voltage failure, technician often wants the time of at substantial to investigate one by one, finally could find out, determine weldering this failure cause stifled, therefore testing process trouble, waste time and energy.
Summary of the invention
The technical problem to be solved in the present invention is, provide a kind of fast, convenient, accurately the outer organic electronic expansion valve of VRF Air Conditioning System whether weld stifled detection method.
Technical solution of the present invention is, provide a kind of outer organic electronic expansion valve of VRF Air Conditioning System whether to weld stifled detection method, its concrete steps are as follows:
A, by the compressor of an off-premises station start run at least 2 minutes;
B, detect the suction temperature T of this off-premises station
1, outdoor heat exchanger coil pipe stage casing temperature T
2, defrosting temperature T
3and outdoor temperature T
o, above-mentioned four temperature values are passed to air-conditioning master controller, and calculate suction temperature T by air-conditioning master controller
1with outdoor temperature T
obetween difference DELTA T
1, outdoor heat exchanger coil pipe stage casing temperature T
2with outdoor temperature T
obetween difference DELTA T
2; Defrosting temperature T
3with outdoor temperature T
obetween difference DELTA T
3;
C, judge whether the Δ T that satisfies condition
1, Δ T
2, Δ T
3all be less than or equal to 3 and the disconnection of off-premises station low pressure switch, if satisfied condition, then determine that outer organic electronic expansion valve welds stifled completely, testing process stops, if do not satisfied condition, then enters next step;
The compressor of d, this off-premises station of continuation operation at least 4 minutes;
E, detection defrosting temperature T now
3' and result is passed to air-conditioning master controller, and judge whether by air-conditioning master controller the T that satisfies condition
3'≤-15 DEG C and off-premises station low pressure switch disconnect, if satisfied condition, then determine that the weldering of outer organic electronic expansion valve portion is stifled, if do not satisfied condition, then determine that outer organic electronic expansion valve does not weld stifled, testing process terminates.
This detection side's ratio juris is: once outer organic electronic expansion valve blocks completely, and the compressor of off-premises station works on after a period of time as more than 2 minutes, cold-producing medium in one section of pipeline after outer organic electronic expansion valve before suction port of compressor will be found time completely, the temperature of the pipeline after finding time will close to outdoor temperature, therefore three diverse locations of pipeline after finding time from this section measure three temperature values coming and T
1, T
2, T
3with outdoor temperature T
othe temperature difference all can not exceed certain scope that is 3 DEG C, and due to outer organic electronic expansion valve blocking, cause the line pressure after finding time to fall sharply, cause off-premises station low pressure switch to disconnect, therefore meet this two conditions, just can determine that outer organic electronic expansion valve cuts out completely, if and outer organic electronic expansion valve portion blocks, pipeline then after outer organic electronic expansion valve before suction port of compressor can not be fully degassed, but because the pipeline in electric expansion valve is by local stoppages, cold-producing medium is by significantly throttling, make the temperature decrease of outer organic electronic expansion valve outlet i.e. outdoor heat exchanger coil pipe inflow point, after electric expansion valve Partial Blocking, compressor operating a period of time, after being no less than 6 minutes, defrosting temperature can lower than certain value as-15 DEG C, and due to electric expansion valve Partial Blocking, this section of line pressure can be caused to decline, off-premises station low pressure switch disconnects.
Adopt above method, whether the outer organic electronic expansion valve of VRF Air Conditioning System of the present invention welds stifled detection method compared with prior art, has the following advantages:
Adopt detection method of the present invention, stifled conclusion whether can be welded fast at short notice in 2 to 6 minutes, and whole test process is detected automatically by air-conditioner set completely, without the need to manual operation, with prior art completely by manually investigating compared with the detection method of finally determining to weld stifled situation one by one, detection method is quick and easy, time saving and energy saving.
Accompanying drawing explanation
Fig. 1 implements the systematic schematic diagram whether outer organic electronic expansion valve of VRF Air Conditioning System of the present invention welds stifled detection method.
Shown in figure 1, compressor, 2, outdoor heat exchanger, 3, off-premises station low pressure switch, 4, outer organic electronic expansion valve, the 5, first temperature sensor, the 6, second temperature sensor, 7, three-temperature sensor.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, whether the outer organic electronic expansion valve of VRF Air Conditioning System of the present invention welds stifled detection method, and its concrete steps are as follows:
A, whole unit is adjusted to heating mode, the compressor 1 of an off-premises station is started shooting and runs at least 2 minutes, as run 2 minutes;
B, detect the suction temperature T of this off-premises station
1, outdoor heat exchanger 2 coil pipe stage casing temperature T
2, defrosting temperature T
3and outdoor temperature T
o, wherein, compressor 1 porch of off-premises station is provided with the first temperature sensor 5, first temperature sensor 5 for measuring temperature and the suction temperature T of compressor 1 porch
1; The coil pipe stage casing of the outdoor heat exchanger 2 of off-premises station is provided with the coil pipe stage casing temperature T of the second temperature sensor 6, second temperature sensor 6 for measuring chamber external heat exchanger 2
2; The porch of the outdoor heat exchanger 2 of off-premises station is provided with three-temperature sensor 7, and three-temperature sensor 7 is for the temperature in T of measuring chamber external heat exchanger 2
3, this temperature in T
3in industry, custom is referred to as the temperature T that defrosts
3; Above-mentioned four temperature values are passed to air-conditioning master controller, and calculates suction temperature T by air-conditioning master controller
1with outdoor temperature T
obetween difference DELTA T
1, outdoor heat exchanger 2 coil pipe stage casing temperature T
2with outdoor temperature T
obetween difference DELTA T
2; Defrosting temperature T
3with outdoor temperature T
obetween difference DELTA T
3.
C, judge whether the Δ T that satisfies condition
1, Δ T
2, Δ T
3all be less than or equal to 3 and off-premises station low pressure switch 3 disconnects, if satisfied condition, then determine that outer organic electronic expansion valve 4 welds completely stifled, testing process stops, if do not satisfied condition, then enters next step.Illustrate, if T
o7 DEG C, T
17 DEG C, T
26 DEG C, T
35 DEG C, then Δ T
1be 0, Δ T
2be 1, Δ T
3be that 2, three values are all less than 3, if now off-premises station low pressure switch 3 disconnects, then outer organic electronic expansion valve 4 welds stifled completely.
The compressor of d, this off-premises station of continuation operation 1 at least 4 minute, as 4 minutes.
E, detection defrosting temperature T now
3' and result is passed to air-conditioning master controller, and judge whether by air-conditioning master controller the T that satisfies condition
3'≤-15 DEG C and off-premises station low pressure switch 3 disconnect, if satisfied condition, then determine that the weldering of outer organic electronic expansion valve 4 part is stifled, if do not satisfied condition, then weldering is not stifled to determine outer organic electronic expansion valve 4, and testing process terminates.
Above detection method, it is the detection method that an off-premises station is carried out, if this multi-joint air unit has multiple off-premises station, then the detection method of detection method also with one off-premises station of multiple off-premises station is identical, namely each off-premises station in this unit is carried out to the detection of same steps, to the detection that each off-premises station carries out, can carry out simultaneously, also can successively carry out.
Claims (1)
1. whether the outer organic electronic expansion valve of VRF Air Conditioning System welds a stifled detection method, it is characterized in that: its concrete steps are as follows:
A, whole unit is adjusted to heating mode, then the start of the compressor (1) of an off-premises station is run at least 2 minutes;
B, detect the suction temperature of this off-premises station
, outdoor heat exchanger (2) coil pipe stage casing temperature
, defrosting temperature
and outdoor temperature
, above-mentioned four temperature values are passed to air-conditioning master controller, and calculate suction temperature by air-conditioning master controller
with outdoor temperature
between difference
, outdoor heat exchanger (2) coil pipe stage casing temperature
with outdoor temperature
between difference
; Defrosting temperature
with outdoor temperature
between difference
;
C, judge whether to satisfy condition
,
,
all be less than or equal to 3 and off-premises station low pressure switch (3) disconnection, if satisfied condition, then determine that outer organic electronic expansion valve (4) is welded stifled completely, testing process stops, if do not satisfied condition, then enters next step;
The compressor of d, this off-premises station of continuation operation (1) at least 4 minute;
E, detection defrosting temperature now
and result is passed to air-conditioning master controller, and judged whether to satisfy condition by air-conditioning master controller
dEG C and off-premises station low pressure switch (3) disconnect, if satisfied condition, then determine that the weldering of outer organic electronic expansion valve (4) part is stifled, if do not satisfied condition, then determine that weldering is not stifled for outer organic electronic expansion valve (4), testing process terminates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210095097.XA CN102645327B (en) | 2012-03-31 | 2012-03-31 | Method for detecting welding blockage of electronic outdoor unit expansion valves of multi-coupled air-conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210095097.XA CN102645327B (en) | 2012-03-31 | 2012-03-31 | Method for detecting welding blockage of electronic outdoor unit expansion valves of multi-coupled air-conditioning unit |
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| CN102645327A CN102645327A (en) | 2012-08-22 |
| CN102645327B true CN102645327B (en) | 2015-01-07 |
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|---|---|---|---|---|
| CN104090831B (en) * | 2014-07-04 | 2017-12-29 | 珠海格力电器股份有限公司 | Method for self-checking welding blockage of dehumidifier |
| CN105954052B (en) * | 2016-05-27 | 2018-04-20 | 珠海格力电器股份有限公司 | Capillary tube blockage detection system and method |
| CN107490156B (en) * | 2017-09-27 | 2019-09-20 | 广东美的暖通设备有限公司 | Three control air-conditionings and its method for diagnosing faults |
| CN108890069A (en) * | 2018-08-22 | 2018-11-27 | 长沙格力暖通制冷设备有限公司 | Welding tool for air conditioner multi-split air conditioner and production line thereof |
| CN109489204B (en) * | 2018-11-14 | 2020-07-31 | 宁波奥克斯电气股份有限公司 | Expansion valve blockage judging method and air conditioner |
| CN109612022B (en) * | 2018-11-28 | 2021-01-26 | 宁波奥克斯电气股份有限公司 | Control method for preventing air conditioner from blocking valve |
| CN109708248B (en) * | 2018-12-29 | 2020-02-04 | 广东美的暖通设备有限公司 | Valve failure detection method of air conditioning system and air conditioning system |
| CN110967207B (en) * | 2019-12-04 | 2021-10-01 | 常州大学 | Welding and plugging performance detection method for integral heat pump water heater system |
| CN115076924A (en) * | 2022-04-20 | 2022-09-20 | 青岛海尔空调器有限总公司 | Air conditioner welding blockage detection method, control system, electronic equipment and storage medium |
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| EP2119982A2 (en) * | 2004-10-18 | 2009-11-18 | Mitsubishi Denki Kabushiki Kaisha | Refrigeration/air conditioning equipment |
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| JP2012063033A (en) * | 2010-09-14 | 2012-03-29 | Panasonic Corp | Air conditioner |
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| EP2119982A2 (en) * | 2004-10-18 | 2009-11-18 | Mitsubishi Denki Kabushiki Kaisha | Refrigeration/air conditioning equipment |
| CN101446463A (en) * | 2007-11-27 | 2009-06-03 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve, and self-adaptive control method and device of heat pump device |
| CN101509693B (en) * | 2009-03-16 | 2011-05-18 | 宁波奥克斯电气有限公司 | Control method of frequency conversion heat pump outdoor machine of air-conditioner electronic expansion valve |
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo AUX Electric Co., Ltd. |