CN102645327A - 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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- CN102645327A CN102645327A CN201210095097XA CN201210095097A CN102645327A CN 102645327 A CN102645327 A CN 102645327A CN 201210095097X A CN201210095097X A CN 201210095097XA CN 201210095097 A CN201210095097 A CN 201210095097A CN 102645327 A CN102645327 A CN 102645327A
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- temperature
- outdoor
- expansion valve
- electronic expansion
- organic electronic
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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 between suction temperature and outdoor temperature, the difference between the temperature of the middle section of the coil of an outdoor heat exchanger (2) and the outdoor temperature and the difference between defrosting temperature and the outdoor temperature are detected and calculated; (c) whether all the differences 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 the defrosting temperature 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, specifically is 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 stations, a plurality of indoor set parallel with one another and two refrigerant circulation house stewards that connect each indoor set and each off-premises station.If off-premises station is one, this off-premises station is communicated with through a plurality of indoor sets after two refrigerants circulation house stewards and the parallel connection; If off-premises station is a plurality of, the parallel connection of then a plurality of off-premises stations, the off-premises station after the parallel connection is communicated with through the indoor set after two refrigerants circulation house stewards and the parallel connection.
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 an end of oil separator; The other end of oil separator is communicated with first valve port of four-way change-over valve; The 3rd valve port of four-way change-over valve is communicated with a refrigerant pipe among two refrigerants circulation house stewards, and another root refrigerant pipe that two refrigerants circulate among the house steward is communicated with an end of reservoir, and the other end of reservoir is communicated with an end of outer organic electronic expansion valve; The other end of outer organic electronic expansion valve is communicated with an end of outdoor heat exchanger; The other end of outdoor heat exchanger is communicated with second valve port of four-way change-over valve, and the 4th valve port of four-way change-over valve is communicated with an end of gas-liquid separator, and the other end of gas-liquid separator is communicated with the suction port of compressor.During heating mode, first valve port of four-way change-over valve is communicated with the 3rd valve port, and second valve port is communicated with the 4th valve port, and promptly refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, this route circulation of compressor.
Organic electronic expansion valve and indoor heat exchanger (being condenser during heating mode) in each indoor set comprises; One end of indoor heat exchanger is communicated with an end of interior organic electronic expansion valve; One among the other end of interior organic electronic expansion valve and the two refrigerants circulation house stewards is communicated with, and another root refrigerant pipe that the other end of indoor heat exchanger and two refrigerants circulate among the house stewards is communicated with.
This VRF Air Conditioning System is provided with the 4th temperature sensor of measuring outdoor temperature
; The place, suction port of compressor of each off-premises station is provided with first temperature sensor, and it is suction temperature
that first temperature sensor is used to measure the temperature of locating the suction port of compressor; The coil pipe stage casing of the outdoor heat exchanger of each off-premises station is provided with second temperature sensor, and second temperature sensor is used for the coil pipe stage casing temperature
of measuring chamber external heat exchanger; The porch of the outdoor heat exchanger of each off-premises station is provided with three-temperature sensor; Three-temperature sensor is used for the temperature in
of measuring chamber external heat exchanger, is accustomed to being referred to as to defrost temperature
in this temperature in
industry; The pipeline near the place, suction port of compressor of each off-premises station is provided with off-premises station low pressure switch; Above-mentioned four temperature sensors and off-premises station low pressure switch are electrically connected with the master controller of air-conditioning.
When VRF Air Conditioning System heated, outer organic electronic expansion valve through regulating the aperture size, was accurately controlled the flow of cold-producing medium as the throttle device of system, controls temperature exactly.And outer organic electronic expansion valve is to be welded on the pipeline of unit by manual work; And the inlet pipe of outer organic electronic expansion valve is no more than 6mm with the internal diameter that goes out pipe; Like this; Can occur welding stifled situation unavoidably,, will cause the front end of outer organic electronic expansion valve to be offered a high price and press fault, rear end to report low voltage failure in case the stifled situation of weldering occurs.Because outer organic electronic expansion valve and system pipeline are that weldering is dead, can't directly detect at all and whether weld stifledly, can only other failure cause be investigated one by one, if be not just last confirm to weld block up.Press and report the reason of low voltage failure to have much but cause air-conditioning to offer a high price; Coil pipe not enough like the rotation speed of fan of outer machine, interior machine, heat interchanger stops up, heat exchanger coils shows and is stained with kapillary obstruction that ash makes that heat is not enough, heat exchanger coils is terminal etc.; So each weldering is blocked up when causing offering a high price pressure and low voltage failure, the technician often wants the time of labor to investigate one by one, could finally find out, confirm stifled this failure cause of weldering; So the testing process trouble wastes time and energy.
Summary of the invention
The technical matters that the present invention will solve is, provide a kind of fast, convenient, whether the outer organic electronic expansion valve of VRF Air Conditioning System welds stifled detection method accurately.
Technical solution of the present invention is, provides a kind of outer organic electronic expansion valve of VRF Air Conditioning System whether to weld stifled detection method, and its concrete steps are following:
A, the start of the compressor of an off-premises station is moved to few 2 minutes;
b, detection of the outdoor unit suction temperature
, the outdoor heat exchanger coil middle temperature
, defrost temperature
and the outdoor temperature
, the above four temperature values to the air-conditioned master controller by the master controller calculates the suction air conditioning temperature
and outdoor temperature
difference between
, the outdoor heat exchanger coil middle temperature
and the outdoor temperature
difference between
; defrost temperature
and the outdoor temperature
difference between
;
C, judge whether to satisfy condition
,
,
all be less than or equal to 3 and off-premises station low pressure switch break off; If satisfy condition; Confirm that then outer organic electronic expansion valve welds stifled fully; Testing process stops; If do not satisfy condition, then get into next step;
The compressor of d, this off-premises station of continuation operation at least 4 minutes;
E, detect the defrosting temperature
of this moment and the result is passed to the air-conditioning master controller; And by the air-conditioning master controller judges whether to satisfy condition
℃ and off-premises station low pressure switch breaks off; If satisfy condition; Confirm that then outer organic electronic expansion valve partly welds stifled; If do not satisfy condition; Weldering is not stifled then to confirm outer organic electronic expansion valve, and testing process finishes.
This detection side's ratio juris is: in case outer organic electronic expansion valve stops up fully; And the compressor of off-premises station works on after a period of time as above 2 minutes; Will find time the cold-producing medium one section pipeline before the suction port of compressor behind outer organic electronic expansion valve fully; The temperature of the pipeline after finding time will be near outdoor temperature; Three diverse locations of the pipeline after event is found time from this section are measured three temperature values that come, and promptly
,
,
all can be not 3 ℃ above certain scope with the temperature difference of outdoor temperature
; And because outer organic electronic expansion valve stops up; Cause the line pressure sharp fall after finding time; Cause off-premises station low pressure switch to break off; So satisfy this two conditions, just can confirm that outer organic electronic expansion valve cuts out fully; And if outer organic electronic expansion valve partly stops up, then can not found time fully from the pipeline before the suction port of compressor behind the outer organic electronic expansion valve, but since the pipeline in the electric expansion valve stopped up by the part; Cold-producing medium is made that by throttling significantly outer organic electronic expansion valve exports the temperature decrease of outdoor heat exchanger coil pipe inflow point just, after the electronic expansion valve portion stops up; Compressor operating a period of time; As after being no less than 6 minutes, the defrosting temperature can be lower than certain value as-15 ℃, and because the obstruction of electronic expansion valve portion; Can cause this section line pressure to descend, off-premises station low pressure switch breaks off.
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; Can whether be welded stifled conclusion fast at short notice as in 2 to 6 minutes; And whole test process detects through the air-conditioning unit fully automatically; Need not manually-operated, investigate last definite detection method of welding stifled situation one by one through manual work fully with prior art and compare, detection method of the present invention is quick and easy, time saving and energy saving.
Description of drawings
Fig. 1 is whether the outer organic electronic expansion valve of embodiment of the present invention VRF Air Conditioning System welds the systematic schematic diagram of stifled detection method.
Shown in the figure 1, compressor, 2, indoor heat exchanger, 3, off-premises station low pressure switch, 4, outer organic electronic expansion valve, 5, first temperature sensor, 6, second temperature sensor, 7, three-temperature sensor.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
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 following:
A, whole unit is adjusted to heating mode,, as move 2 minutes the compressor 1 start operation of an off-premises station at least 2 minutes;
b, detection of the outdoor unit suction temperature
, the outdoor heat exchanger coil 2 middle temperature
, defrost temperature
and the outdoor temperature
, where the entrance to the outdoor unit compressor has a first temperature sensor 5, the first temperature sensor 5 is used to measure the temperature of the compressor a suction inlet temperature
; outdoor unit 2 of the outdoor heat exchanger coil of the middle of a second temperature sensor 6, the second temperature sensor 6 for measuring the outdoor heat exchanger 2 middle coil temperature
; outdoor heat exchanger of the outdoor unit 2 at the entrance to a third temperature sensor 7, the third temperature sensor 7 for measuring the outdoor heat exchanger 2 is an inlet temperature
, the inlet temperature
termed customary within the industry for the defrost temperature
; temperature value will be passed to the four air-conditioned master controller by the master controller calculates the intake air temperature
and the outdoor temperature
difference between
, the outdoor heat exchanger coil 2 middle temperature
and Outdoor temperature
difference between
; defrost temperature
and the outdoor temperature
difference between
.
C, judge whether to satisfy condition
,
,
all be less than or equal to 3 and off-premises station low pressure switch 3 break off; If satisfy condition; It is stifled to confirm that then outer organic electronic expansion valve 4 welds fully; Testing process stops; If do not satisfy condition, then get into next step.Illustrate; If
is 7 ℃;
is 7 ℃;
is 6 ℃;
is 5 ℃; Then
is 0;
is 1;
is 2; Three values are all less than 3; If off-premises station low pressure switch 3 disconnections this moment, then outer organic electronic expansion valve 4 welds stifled fully.
The compressor of d, this off-premises station of continuation operation 1 at least 4 minute was as 4 minutes.
E, detect the defrosting temperature
of this moment and the result is passed to the air-conditioning master controller; And by the air-conditioning master controller judges whether to satisfy condition
℃ and off-premises station low pressure switch 3 breaks off; If satisfy condition; Confirm that then outer organic electronic expansion valve 4 parts weldering is stifled; If do not satisfy condition; Weldering is not stifled then to confirm outer organic electronic expansion valve 4, and testing process finishes.
Above detection method; Be the detection method that an off-premises station is carried out, had a plurality of off-premises stations if should join the air unit more, then also the detection method with an off-premises station is identical for the detection method of a plurality of off-premises stations; Promptly each off-premises station in this unit is all carried out the detection of same steps as; 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 a VRF Air Conditioning System welds stifled detection method, and it is characterized in that: its concrete steps are following:
A, whole unit is adjusted to heating mode, again with compressor (1) the start operation of an off-premises station at least 2 minutes;
b, detection of the outdoor unit suction temperature
, the outdoor heat exchanger (2) middle coil temperature
, defrost temperature
and the outdoor temperature
, the The four temperature values to the air master controller by the master controller calculates the intake air temperature
and the outdoor temperature
difference between
, the outdoor heat exchanger device (2) middle coil temperature
and the outdoor temperature
difference between
; defrost temperature
and the outdoor temperature
The the difference between
;
C, judge whether to satisfy condition
,
,
all be less than or equal to 3 and off-premises station low pressure switch (3) break off; If satisfy condition; It is stifled to confirm that then outer organic electronic expansion valve (4) welds fully; Testing process stops; If do not satisfy condition, then get into next step;
The compressor of d, this off-premises station of continuation operation (1) at least 4 minute;
E, detect the defrosting temperature
of this moment and the result is passed to the air-conditioning master controller; And by the air-conditioning master controller judges whether to satisfy condition
℃ and off-premises station low pressure switch (3) breaks off; If satisfy condition; Confirm that then the weldering of outer organic electronic expansion valve (4) part is stifled; If do not satisfy condition; Weldering is not stifled then to confirm outer organic electronic expansion valve (4), and testing process finishes.
Priority Applications (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 |
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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| Publication Number | Publication Date |
|---|---|
| CN102645327A true CN102645327A (en) | 2012-08-22 |
| CN102645327B CN102645327B (en) | 2015-01-07 |
Family
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090831A (en) * | 2014-07-04 | 2014-10-08 | 珠海格力电器股份有限公司 | Method for dehumidifier welding blocking self detecting |
| CN105954052A (en) * | 2016-05-27 | 2016-09-21 | 珠海格力电器股份有限公司 | Capillary tube obstruction detection system and method |
| CN107490156A (en) * | 2017-09-27 | 2017-12-19 | 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 | A kind of welding tooling and its production line of air conditioning multi-couple machine |
| CN109489204A (en) * | 2018-11-14 | 2019-03-19 | 宁波奥克斯电气股份有限公司 | Expansion valve blocks determination method and air conditioner |
| CN109612022A (en) * | 2018-11-28 | 2019-04-12 | 宁波奥克斯电气股份有限公司 | A kind of control method for preventing air-conditioning from blocking up valve operation |
| CN109708248A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | The valve body abatement detecting method and air-conditioning system of air-conditioning system |
| CN110967207A (en) * | 2019-12-04 | 2020-04-07 | 常州大学 | Welding and plugging performance detection method for integral heat pump water heater system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090831A (en) * | 2014-07-04 | 2014-10-08 | 珠海格力电器股份有限公司 | Method for dehumidifier welding blocking self detecting |
| CN104090831B (en) * | 2014-07-04 | 2017-12-29 | 珠海格力电器股份有限公司 | The method of the stifled self-test of dehumidifier weldering |
| CN105954052A (en) * | 2016-05-27 | 2016-09-21 | 珠海格力电器股份有限公司 | Capillary tube obstruction detection system and method |
| CN105954052B (en) * | 2016-05-27 | 2018-04-20 | 珠海格力电器股份有限公司 | A kind of capillary clogging detecting system and method |
| CN107490156A (en) * | 2017-09-27 | 2017-12-19 | 广东美的暖通设备有限公司 | Three control air-conditionings and its method for diagnosing faults |
| 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 | A kind of welding tooling and its production line of air conditioning multi-couple machine |
| CN109489204A (en) * | 2018-11-14 | 2019-03-19 | 宁波奥克斯电气股份有限公司 | Expansion valve blocks determination method and air conditioner |
| CN109612022A (en) * | 2018-11-28 | 2019-04-12 | 宁波奥克斯电气股份有限公司 | A kind of control method for preventing air-conditioning from blocking up valve operation |
| CN109708248A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | The valve body abatement detecting method and air-conditioning system of air-conditioning system |
| CN110967207A (en) * | 2019-12-04 | 2020-04-07 | 常州大学 | Welding and plugging performance detection method for integral heat pump water heater system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102645327B (en) | 2015-01-07 |
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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. |