CN114017961A - Device and method for recycling refrigerant of whole vehicle air conditioning system - Google Patents
Device and method for recycling refrigerant of whole vehicle air conditioning system Download PDFInfo
- Publication number
- CN114017961A CN114017961A CN202111435208.2A CN202111435208A CN114017961A CN 114017961 A CN114017961 A CN 114017961A CN 202111435208 A CN202111435208 A CN 202111435208A CN 114017961 A CN114017961 A CN 114017961A
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- Prior art keywords
- valve
- refrigerant
- air conditioning
- conditioning system
- refrigerant recovery
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 98
- 238000004378 air conditioning Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004064 recycling Methods 0.000 title description 2
- 238000011084 recovery Methods 0.000 claims abstract description 80
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 11
- 239000011521 glass Substances 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 6
- 239000010726 refrigerant oil Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/002—Collecting refrigerant from a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/003—Control issues for charging or collecting refrigerant to or from a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/007—Details for charging or discharging refrigerants; Service stations therefor characterised by the weighing of refrigerant or oil
Abstract
The invention discloses a device and a method for recovering a refrigerant of an air conditioning system of a whole vehicle, wherein the device comprises a vacuum pump, a low-pressure gauge, a high-pressure gauge, a liquid sight glass, an oil-gas separator, a refrigerant recovery tank, a liquid nitrogen tank, a valve A, a valve B, a valve C, a valve D, a valve E, a valve F and a valve G; the vacuum pump, the valve G, the valve D and the valve B are sequentially connected in series through pipelines; the low-pressure gauge is arranged on a pipeline connecting the valve D and the valve B; the refrigerant recovery tank, the valve F, the oil-gas separator, the valve E, the valve C and the valve A are sequentially connected in series through pipelines; the high-pressure gauge is arranged on a pipeline connecting the valve C and the valve A; the liquid sight glass is respectively connected with the valve C and the valve D through pipelines; and liquid nitrogen is arranged in the liquid nitrogen tank. The invention can realize the accurate recovery of the refrigerant of the whole vehicle air conditioning system.
Description
Technical Field
The invention belongs to the technical field of automobile testing, and particularly relates to a device and a method for recovering a refrigerant of an air conditioning system of a whole automobile.
Background
The refrigeration principle of the automobile air conditioner is to utilize a refrigeration medium to convert between a liquid state and a gas state to absorb heat for heat exchange so as to achieve the purpose of temperature reduction (at present, a refrigerant mainly used by the automobile air conditioner is R134 a). However, under severe vibration and impact conditions of the whole vehicle air conditioning system, R134a leakage easily occurs at joints of parts and pipeline joints due to vibration; the refrigerant inside the compressor is easy to leak from the joint of the shaft seal and the cylinder; meanwhile, the R134a has small molecules, so that leakage is generated along with the permeation of the air conditioning rubber hose during the operation of the system, and when the leakage amount of the system reaches a certain value, the function and the refrigerating capacity of the whole vehicle air conditioning system are affected, so that the function of the air conditioning system is abnormal.
In order to meet the requirements of the cooling effect and performance of the air conditioning system of the whole vehicle, an effective method for detecting the leakage amount of the refrigerant of the air conditioning system of the whole vehicle with high precision needs to be designed while the shaft seal structure of the compressor, the sealing mode of the pipeline joint, the material and the structure of the rubber tube and the like are optimized to further reduce the leakage amount of the refrigerant of the system. In order to ensure accurate checking of the refrigerant leakage amount, it is necessary to develop a refrigerant recovery apparatus and method for a vehicle air conditioning system.
Disclosure of Invention
The invention provides a device and a method for recovering a refrigerant of an air conditioning system of a whole vehicle, which can accurately recover the refrigerant of the air conditioning system of the whole vehicle.
In a first aspect, the refrigerant recovery device of the air conditioning system of the whole vehicle comprises a vacuum pump, a low-pressure gauge, a high-pressure gauge, a liquid observation mirror, an oil-gas separator, a refrigerant recovery tank, a liquid nitrogen tank, a valve A, a valve B, a valve C, a valve D, a valve E, a valve F and a valve G;
the vacuum pump, the valve G, the valve D and the valve B are sequentially connected in series through pipelines; the low-pressure gauge is arranged on a pipeline connecting the valve D and the valve B;
the refrigerant recovery tank, the valve F, the oil-gas separator, the valve E, the valve C and the valve A are sequentially connected in series through pipelines; the high-pressure gauge is arranged on a pipeline connecting the valve C and the valve A;
the liquid sight glass is respectively connected with the valve C and the valve D through pipelines;
and liquid nitrogen is arranged in the liquid nitrogen tank.
In a second aspect, the present invention provides a method for recovering a refrigerant of a vehicle air conditioning system, which employs the apparatus for recovering a refrigerant of a vehicle air conditioning system according to the present invention to connect a valve a to a high-pressure interface of a vehicle air conditioning system and to connect a valve B to a low-pressure interface of the vehicle air conditioning system, and the method includes the following steps:
step 2, idling the engine, setting the air conditioning system to be in an internal circulation full heat mode, and turning on the air conditioner;
step 3, closing the engine, closing the valve A to the valve G, and connecting a low-pressure gauge and a high-pressure gauge; opening a valve C, a valve D, a valve E, a valve F and a valve G, vacuumizing the pressure gauge and the refrigerant recovery tank, and then closing the valve G;
step 4, closing the valve E, and immersing the refrigerant recovery tank into a liquid nitrogen tank filled with liquid nitrogen; slowly opening the valve A and the valve B; when no refrigerating oil flows to the refrigerant recovery tank through the liquid sight glass, opening a valve E to recover the refrigerant in the air-conditioning system;
step 5, when the pressure of the pressure gauge is smaller than a first preset pressure, setting the air conditioning system to be in an internal circulation total heat mode, setting an air blower with the maximum air volume, turning an air conditioning switch to an OFF position, idling an engine, and accelerating the evaporation of a refrigerant from the refrigerant oil in the evaporator;
step 6, when the pressure of the pressure gauge is less than or equal to a second preset pressure, closing the valve E, and checking whether the pressure rises; if there is no pressure rise, it indicates that the refrigerant recovery operation has been completed; otherwise, opening the valve E and repeating the recovery operation of the refrigerant until the recovery operation of the refrigerant is finished; after the recovery operation of the refrigerant is completed, the valve F is closed, and the refrigerant recovery tank is removed.
Optionally, in the step 1, after the refrigerant recovery tank is vacuumized, weighing the weight W1 of the refrigerant recovery tank in unit g;
after the recovery operation of the refrigerant is finished, removing the refrigerant recovery tank from the liquid nitrogen, and removing frost formed on the surface of the refrigerant recovery tank by using air; a separation pressure gauge which is used for weighing the weight W2 of the refrigerant recovery tank in unit g;
the refrigerant recovery weight Wrefrac, W2-W1, in g, was calculated.
Optionally, the first preset pressure is 0.05mpa (g);
the second preset pressure is-0.1 MPa (G).
The invention has the following advantages: the invention can accurately recover the refrigerant of the whole vehicle air conditioning system, and can accurately confirm whether the leakage quantity of the refrigerant of the whole vehicle meets the standard requirement or not by comparing the weight of the refrigerant before and after recovery.
Drawings
FIG. 1 is a schematic connection diagram of the prior art;
FIG. 2 is a schematic connection diagram of the present embodiment;
fig. 3 is a schematic operation flow diagram of the present embodiment.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 2, in this embodiment, a refrigerant recovery device of an air conditioning system of a whole vehicle includes a vacuum pump, a low-pressure gauge, a high-pressure gauge, a liquid level indicator, an oil-gas separator, a refrigerant recovery tank, a liquid nitrogen tank, a valve a, a valve B, a valve C, a valve D, a valve E, a valve F, and a valve G. The vacuum pump, the valve G, the valve D and the valve B are sequentially connected in series through pipelines; and the low-pressure gauge is arranged on a pipeline connecting the valve D and the valve B. The refrigerant recovery tank, the valve F, the oil-gas separator, the valve E, the valve C and the valve A are sequentially connected in series through pipelines; and the high-pressure gauge is arranged on a pipeline connecting the valve C and the valve A. And the liquid sight glass is respectively connected with the valve C and the valve D through pipelines. And liquid nitrogen is arranged in the liquid nitrogen tank.
After the whole vehicle air conditioning system runs or stops, the compressor, the evaporator, the condenser and the air conditioning pipeline in the system loop all contain refrigerants. Referring to fig. 2, firstly, the vacuum pump, the pressure gauge, the oil-gas separator and other devices are connected with the whole vehicle air conditioning system, the whole vehicle air conditioning system and the vacuum pump can be controlled to be closed and closed through the valve A and the valve B, then the low-temperature physical characteristic of liquid nitrogen is combined, the refrigerant recovery tank can reach the extremely low temperature by controlling the switch from the valve A to the valve G and utilizing the suction principle of the vacuum pump, meanwhile, the pressure in the refrigerant recovery tank can reach the high vacuum value, and the refrigerant in the whole vehicle air conditioning system can be recovered into the recovery tank more easily and accurately,
as shown in fig. 3, in this embodiment, a method for recovering a refrigerant of a vehicle air conditioning system, which uses the refrigerant recovery apparatus of a vehicle air conditioning system according to this embodiment, during recovery, a valve a is connected to a high-pressure interface of the vehicle air conditioning system, and a valve B is connected to a low-pressure interface of the vehicle air conditioning system, includes the following steps:
And 2, setting the air conditioning system to be in an internal circulation full-heat mode (the manual air conditioner is heated to the hottest state, the automatic air conditioning temperature is adjusted to the highest state), setting the air volume of the air blower to be the largest, setting the air conditioning switch to be in an ON state, and idling the engine for 30min to enable the lubricating oil to circulate in the air conditioning system.
Step 3, closing the engine, closing the valve A to the valve G, and connecting a low-pressure gauge and a high-pressure gauge; opening a valve C, a valve D, a valve E, a valve F and a valve G, vacuumizing the pressure gauge and the refrigerant recovery tank, and closing the valve G after vacuumizing operation is performed for 10 min; checking whether the pressure of the system is changed, if the pressure rises, checking whether the fastening of each connecting piece is in a problem, and then checking the pressure.
And 4, after confirming that no pressure rises, closing the valve E, and immersing the refrigerant recovery tank into a liquid nitrogen tank filled with liquid nitrogen. In order to avoid oil return, the valve A and the valve B are opened slowly. When no refrigerant oil flows to the refrigerant recovery tank as observed by a sight glass, the valve E is carefully opened to recover the refrigerant in the air conditioning system for 30min to 60 min.
Step 5, when the pressure of the pressure gauge is smaller than a first preset pressure, setting the air conditioning system to be in an internal circulation full heat mode (the manual air conditioner is turned to full heat, the automatic air conditioner is turned to the highest temperature), setting the air blower to have the largest air volume, turning the air conditioner switch to the OFF position, idling the engine for 10min, and accelerating the evaporation of the refrigerant from the refrigerant oil in the evaporator;
step 6, when the pressure of the pressure gauge is less than or equal to a second preset pressure, closing the valve E, and checking whether the pressure rises (within 10 min); if there is no pressure rise, it indicates that the refrigerant recovery operation has been completed; otherwise, opening the valve E and repeating the recovery operation of the refrigerant until the recovery operation of the refrigerant is finished; after the recovery operation of the refrigerant is completed, all the valves are closed, and the refrigerant recovery tank is removed.
In this example, in the step 1, when the pressure was reduced to-0.1 MPa (G), the weight W1 in g of the refrigerant recovery tank was measured. After the recovery operation of the refrigerant is finished, removing the refrigerant recovery tank from the liquid nitrogen, and removing frost formed on the surface of the refrigerant recovery tank by using air; the weight W2 of the refrigerant recovery tank was measured in units of g by a separate pressure gauge. The refrigerant recovery weight Wrefrac, W2-W1, in g, was calculated.
In fig. 3, "x" indicates off, and "o" indicates on.
In this embodiment, the first predetermined pressure is 0.05mpa (g). The second preset pressure is-0.1 MPa (G).
Table 1: the method is a comparison table for respectively recovering the coolant by adopting the method and the existing method:
conventionally, a method such as that shown in fig. 1 is used to recover a refrigerant.
In the embodiment, the refrigerant recovery tank is cooled by adding the liquid nitrogen auxiliary system (namely the liquid nitrogen tank and the liquid nitrogen arranged in the liquid nitrogen tank) and simultaneously combining the low-temperature physical characteristics of the liquid nitrogen, so that the refrigerant recovery tank reaches extremely low temperature, the pressure in the tank can reach a high vacuum value, the refrigerant can be recovered from the whole vehicle air conditioning system more easily (the recovery precision can be controlled within +/-5 g), and the deviation of +/-100 g caused by residue is improved by 95% on the basis of the conventional recovery method of the filling machine;
meanwhile, in order to avoid the influence of the following recovery of the refrigeration oil in the air conditioning system during the recovery, a valve F for adjusting the flow is added in the recovery process and used for controlling the opening of the recovery system so as to reduce the recovery amount of the refrigeration oil, and a liquid-gas separator is connected at the front end of a refrigerant recovery tank so that the refrigeration oil is finally intercepted before entering the refrigerant recovery tank.
Claims (4)
1. The utility model provides a whole car air conditioning system refrigerant recovery unit which characterized in that: the system comprises a vacuum pump, a low-pressure gauge, a high-pressure gauge, a liquid sight glass, an oil-gas separator, a refrigerant recovery tank, a liquid nitrogen tank, a valve A, a valve B, a valve C, a valve D, a valve E, a valve F and a valve G;
the vacuum pump, the valve G, the valve D and the valve B are sequentially connected in series through pipelines; the low-pressure gauge is arranged on a pipeline connecting the valve D and the valve B;
the refrigerant recovery tank, the valve F, the oil-gas separator, the valve E, the valve C and the valve A are sequentially connected in series through pipelines; the high-pressure gauge is arranged on a pipeline connecting the valve C and the valve A;
the liquid sight glass is respectively connected with the valve C and the valve D through pipelines;
and liquid nitrogen is arranged in the liquid nitrogen tank.
2. A method for recovering a refrigerant of an air conditioning system of a whole vehicle is characterized by comprising the following steps: the vehicle air conditioning system refrigerant recovery device according to claim 1, wherein the valve a is connected to a high pressure port of the vehicle air conditioning system, and the valve B is connected to a low pressure port of the vehicle air conditioning system, and the method comprises the following steps:
step 1, vacuumizing a refrigerant recovery tank;
step 2, idling the engine, setting the air conditioning system to be in an internal circulation full heat mode, and turning on the air conditioner;
step 3, closing the engine, closing the valve A to the valve G, and connecting a low-pressure gauge and a high-pressure gauge; opening a valve C, a valve D, a valve E, a valve F and a valve G, vacuumizing the pressure gauge and the refrigerant recovery tank, and then closing the valve G;
step 4, closing the valve E, and immersing the refrigerant recovery tank into a liquid nitrogen tank filled with liquid nitrogen; slowly opening the valve A and the valve B; when no refrigerating oil flows to the refrigerant recovery tank through the liquid sight glass, opening a valve E to recover the refrigerant in the air-conditioning system;
step 5, when the pressure of the pressure gauge is smaller than a first preset pressure, setting the air conditioning system to be in an internal circulation total heat mode, setting an air blower with the maximum air volume, turning an air conditioning switch to an OFF position, idling an engine, and accelerating the evaporation of a refrigerant from the refrigerant oil in the evaporator;
step 6, when the pressure of the pressure gauge is less than or equal to a second preset pressure, closing the valve E, and checking whether the pressure rises; if there is no pressure rise, it indicates that the refrigerant recovery operation has been completed; otherwise, opening the valve E and repeating the recovery operation of the refrigerant until the recovery operation of the refrigerant is finished; after the recovery operation of the refrigerant is completed, the valve F is closed, and the refrigerant recovery tank is removed.
3. The vehicle air conditioning system refrigerant recovery device of claim 2, wherein: in the step 1, after the refrigerant recovery tank is vacuumized, weighing the weight W1 of the refrigerant recovery tank in unit g;
after the recovery operation of the refrigerant is finished, removing the refrigerant recovery tank from the liquid nitrogen, and removing frost formed on the surface of the refrigerant recovery tank by using air; a separation pressure gauge which is used for weighing the weight W2 of the refrigerant recovery tank in unit g;
refrigerant recovery weight, Wrefrac = W2-W1, in g, was calculated.
4. The vehicle air conditioning system refrigerant recovery device of claim 3, wherein: the first preset pressure is 0.05MPa (G);
the second preset pressure is-0.1 MPa (G).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111435208.2A CN114017961A (en) | 2021-11-29 | 2021-11-29 | Device and method for recycling refrigerant of whole vehicle air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111435208.2A CN114017961A (en) | 2021-11-29 | 2021-11-29 | Device and method for recycling refrigerant of whole vehicle air conditioning system |
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| Publication Number | Publication Date |
|---|---|
| CN114017961A true CN114017961A (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111435208.2A Pending CN114017961A (en) | 2021-11-29 | 2021-11-29 | Device and method for recycling refrigerant of whole vehicle air conditioning system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001174109A (en) * | 1999-12-15 | 2001-06-29 | Mitsubishi Electric Corp | Method and apparatus for recovering refrigerant, method for cleaning refrigeration cycle, method for replacing refrigeration cycle and refrigeration cycle device |
| JP2002162135A (en) * | 2000-11-20 | 2002-06-07 | Fujitsu General Ltd | Refrigerant recovery device |
| CN102840722A (en) * | 2011-06-21 | 2012-12-26 | 叶必武 | Refrigerant recovering and filling machine of vehicle air conditioner |
| CN103115458A (en) * | 2013-02-08 | 2013-05-22 | 甘小琴 | Full automatic gas recovering and charging device and method |
| JP2014085082A (en) * | 2012-10-26 | 2014-05-12 | Mk Seiko Co Ltd | Refrigerant processor |
| CN104807262A (en) * | 2015-05-05 | 2015-07-29 | 上海佐竹冷热控制技术有限公司 | Refrigerating agent filling and recovering system and refrigerating agent filling and recovering method for vehicle air conditioner test system |
| CN108344215A (en) * | 2018-01-05 | 2018-07-31 | 新奥泛能网络科技股份有限公司 | Refrigerant recovering apparatus |
-
2021
- 2021-11-29 CN CN202111435208.2A patent/CN114017961A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001174109A (en) * | 1999-12-15 | 2001-06-29 | Mitsubishi Electric Corp | Method and apparatus for recovering refrigerant, method for cleaning refrigeration cycle, method for replacing refrigeration cycle and refrigeration cycle device |
| JP2002162135A (en) * | 2000-11-20 | 2002-06-07 | Fujitsu General Ltd | Refrigerant recovery device |
| CN102840722A (en) * | 2011-06-21 | 2012-12-26 | 叶必武 | Refrigerant recovering and filling machine of vehicle air conditioner |
| JP2014085082A (en) * | 2012-10-26 | 2014-05-12 | Mk Seiko Co Ltd | Refrigerant processor |
| CN103115458A (en) * | 2013-02-08 | 2013-05-22 | 甘小琴 | Full automatic gas recovering and charging device and method |
| CN104807262A (en) * | 2015-05-05 | 2015-07-29 | 上海佐竹冷热控制技术有限公司 | Refrigerating agent filling and recovering system and refrigerating agent filling and recovering method for vehicle air conditioner test system |
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Application publication date: 20220208 |