CN114812023A - Mixed working medium filling and adjusting system - Google Patents
Mixed working medium filling and adjusting system Download PDFInfo
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- CN114812023A CN114812023A CN202210503557.1A CN202210503557A CN114812023A CN 114812023 A CN114812023 A CN 114812023A CN 202210503557 A CN202210503557 A CN 202210503557A CN 114812023 A CN114812023 A CN 114812023A
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- 239000003507 refrigerant Substances 0.000 claims abstract description 214
- 239000007788 liquid Substances 0.000 claims abstract description 76
- 230000009471 action Effects 0.000 claims abstract description 9
- 230000005484 gravity Effects 0.000 claims abstract description 8
- 238000005303 weighing Methods 0.000 claims description 14
- 238000009530 blood pressure measurement Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000005057 refrigeration Methods 0.000 description 5
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G17/00—Apparatus for or methods of weighing material of special form or property
- G01G17/04—Apparatus for or methods of weighing material of special form or property for weighing fluids, e.g. gases, pastes
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a working medium filling system, in particular to a mixed working medium filling adjusting system, which comprises a refrigerant liquid storage tank, a refrigerant system pipeline, a vacuum pump and a gas collecting tank, wherein the refrigerant liquid storage tank is connected with the refrigerant system pipeline; the refrigerant liquid storage tank is respectively communicated with the air inlet end of the vacuum pump and a refrigerant system pipeline through pipelines, and the air outlet end of the vacuum pump is communicated with the gas collection tank through a pipeline; the refrigerant liquid storage tank is higher than the refrigerant system pipeline; after the refrigerant liquid storage tank is vacuumized by the vacuum pump, the refrigerant enters the refrigerant liquid storage tank under the action of negative pressure and then enters a refrigerant system pipeline under the action of gravity. Compared with the prior art, the invention utilizes a pressure balancing method and gravity action to fill the low-pressure refrigerant into the refrigerant filling regulating system of the mixed refrigerant circulating pipeline; the problem of filling and adjusting the proportion of the low-pressure refrigerant in the mixed refrigerant circulating pipeline can be solved.
Description
Technical Field
The invention relates to a working medium filling system, in particular to a mixed working medium filling adjusting system.
Background
The mixed refrigerant is usually composed of two or more refrigerants with different saturation pressures, also called non-azeotropic mixed refrigerant, and the component ratio of the refrigerant determines the efficiency and the working temperature region of the refrigeration system. The existing non-azeotropic mixed refrigerant filling method needs to accurately calculate the proportion of the refrigerant and then sequentially fill the refrigerant into the system from low to high according to the saturation pressure.
At present, the method for filling the mixed working medium refrigerant is to fill a low-pressure refrigerant first and then a high-pressure refrigerant. The mass of each refrigerant needs to be accurately measured before filling, and the low-pressure refrigerant cannot be filled and adjusted after filling. For example, in the invention patent with publication number CN106566476A, after the refrigerant system is vacuumized, the refrigerant mixture with the components of R142b (saturation pressure of 0.195MPa), R134a (saturation pressure of 0.401MPa) and R22 (saturation pressure of 0.661MPa) is first filled with the liquid refrigerant of R142b in a required ratio, then with the liquid refrigerant of R134a in a required ratio, and finally with the liquid refrigerant of R22 in a required ratio. If the refrigerant charge calculation is deviated or the refrigerant leaks, all the refrigerant is discharged, and the refrigerant is charged again according to the method, so that the proportion of each refrigerant is ensured to be unchanged. This patent fills the process and need fill steps such as high pressure after filling low pressure earlier, and the later stage can't continue to fill and adjust low pressure refrigerant, in case calculate the refrigerant that the deviation appears or take place to reveal and all need to arrange the system in to cause the waste and the environmental pollution of refrigerant. In order to solve the problems, a mixed working medium filling and adjusting system is provided.
Disclosure of Invention
The invention aims to solve at least one of the problems, and provides a mixed working medium filling and adjusting system, which fills low-pressure refrigerant into a refrigerant system pipeline by utilizing the height difference between a refrigerant liquid storage tank and the refrigerant system pipeline, solves the problem that the low-pressure refrigerant cannot be filled and adjusted when the refrigerant filling amount is calculated to have deviation or the refrigerant leaks, thereby reducing the waste and the environmental pollution of the refrigerant, reducing the refrigerant cost and facilitating the operation of a refrigerating system.
The purpose of the invention is realized by the following technical scheme:
a mixed working medium filling and adjusting system comprises a refrigerant liquid storage tank, a refrigerant system pipeline, a vacuum pump and a gas collection tank;
the refrigerant liquid storage tank is respectively communicated with the air inlet end of the vacuum pump and a refrigerant system pipeline through pipelines, and the air outlet end of the vacuum pump is communicated with the gas collecting tank through a pipeline;
the refrigerant liquid storage tank is higher than the refrigerant system pipeline;
after the refrigerant liquid storage tank is vacuumized by the vacuum pump, the refrigerant enters the refrigerant liquid storage tank under the action of negative pressure and then enters a refrigerant system pipeline under the action of gravity.
Preferably, the refrigerant liquid storage tank is arranged at a height 30-50cm higher than the refrigerant system pipeline.
Preferably, the system also comprises a lifting platform, wherein the lifting platform is arranged below the refrigerant liquid storage tank and used for adjusting the height of the refrigerant liquid storage tank.
Preferably, the system also comprises an electronic weighing scale which is arranged below the refrigerant liquid storage tank and used for weighing the mass of the refrigerant in the refrigerant liquid storage tank.
Preferably, the precision of the weighing electronic scale is 1 g.
Preferably, the exhaust volume of the vacuum pump is not less than 20L/min; the vacuumizing time is at least 1h until the vacuum degree in the refrigerant liquid storage tank is less than or equal to 10 Pa.
Preferably, a manifold pressure gauge is further arranged between the vacuum pump and the refrigerant liquid storage tank, and the vacuum pump and the manifold pressure gauge as well as the manifold pressure gauge and the refrigerant liquid storage tank are connected through pressure-resistant hoses.
Preferably, the vacuum degree measuring range of the low-pressure side of the manifold pressure gauge is 0-101kPa, the pressure measuring scale is started from 0kPa, and the measuring range is not lower than 2110 kPa; the pressure measurement scale on the high pressure side of the manifold pressure gauge starts at 0kPa and is no lower than 4200 kPa.
Preferably, the top of the refrigerant liquid storage tank is communicated with a refrigerant system pipeline through a pipeline, and a ball valve is arranged on the pipeline; the top of the refrigerant liquid storage tank is communicated with the refrigerant system pipeline by opening the ball valve, so that the internal pressure of the refrigerant liquid storage tank is balanced with the internal pressure of the refrigerant system pipeline.
Preferably, a check valve is arranged on a pipeline connecting the vacuum pump and the gas collecting tank, and a ball valve and a check valve are sequentially arranged on a pipeline connecting the refrigerant liquid storage tank and the refrigerant system pipeline.
Preferably, the top of the refrigerant liquid storage tank is also provided with a safety valve, a thermometer and a pressure gauge.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has the advantages that the low-pressure refrigerant to be filled can be determined by a weighing electronic scale in the first step; secondly, low-pressure refrigerant is filled into a refrigerant liquid storage tank in advance, the refrigerant liquid storage tank is vacuumized by a vacuum pump, the vacuum pump and a valve thereof are closed after the vacuumization is finished, and the valves of the refrigerant liquid storage tank and a filling tank (namely a storage tank which stores corresponding refrigerant and is used for filling the refrigerant into the refrigerant liquid storage tank) are opened, so that the filling of the low-pressure refrigerant is finished; and thirdly, after the filling is finished, closing a valve of the filling tank, connecting the refrigerant liquid storage tank with the refrigerating system, opening the valve between the refrigerant liquid storage tank and the refrigerating system, and filling the low-pressure refrigerant into the mixed refrigerant system pipeline by using gravity. The whole process is simple, the effect is uniform, and the problem that the low-pressure refrigerant cannot be continuously filled and adjusted when the refrigerant filling amount is calculated to be deviated or the refrigerant leaks can be greatly solved, so that the waste and the environmental pollution of the refrigerant are reduced, the refrigerant cost is reduced, and the operation of a refrigeration system is facilitated.
2. The lower part of the refrigerant liquid storage tank is provided with a lifting platform, and the refrigerant liquid storage tank can be adjusted according to the required height; the weighing electronic scale is arranged at the lower part of the refrigerant liquid storage tank, so that the addition amount of the refrigerant can be accurately measured, and the accurate control is facilitated; the refrigerant system pipeline is communicated with the top end of the refrigerant liquid storage tank in air pressure, so that pressure difference can be avoided when refrigerant is injected into the refrigerant system pipeline, and the refrigerant can be smoothly injected into the refrigerant system pipeline.
3. The invention fills the refrigerant into the mixed refrigerant circulating pipeline through the action of balanced pressure and gravity, not only can be used as a system for adding the refrigerant conventionally, but also can supplement the low-pressure refrigerant when the problem of filling quantity is found, thereby overcoming the problem that the mixing is required from the beginning once an error occurs in the prior art, avoiding the waste of the refrigerant and reducing the pollution to the environment.
Drawings
FIG. 1 is a schematic diagram of the conditioning system of the present invention;
in the figure: 1-a refrigerant reservoir; 2-refrigerant system piping; 3-a vacuum pump; 4-a gas collection tank; 5, lifting the platform; 6-weighing electronic scales; 7-manifold pressure gauge; 8-ball valve; 9-a check valve; 10-safety valve; 11-a thermometer; 12-pressure gauge.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1, the schematic diagram of the novel mixed working medium filling and adjusting system of the invention comprises a refrigerant liquid storage tank 1, a lifting platform 5, a check valve 9, a weighing electronic scale 6, a vacuum pump 3, a gas collection tank 4, a manifold pressure gauge 7, a ball valve 8, a safety valve 10, a thermometer 11 and a pressure gauge 12.
In foretell novel mixed working medium filling governing system, be equipped with weighing electronic scale 6 below low pressure refrigerant liquid storage pot 1, the electronic scale precision is more than 1g, can accurately weigh required low pressure refrigerant filling volume to can fill in real time survey mass change when filling refrigerant to refrigerant system pipeline 2, with control the filling volume better and satisfy the injection needs.
In the novel mixed working medium filling and adjusting system, the lifting platform 5 is arranged below the refrigerant liquid storage tank 1, and the height of the lifting platform 5 is adjusted through the driving motor (the lifting platform 5 can be internally provided, or can be connected with an external driving motor to realize the driving of the lifting platform 5), so that the refrigerant liquid storage tank 1 is lifted or lowered to be 30-50cm higher than the mixed refrigerant system pipeline 2.
In the novel mixed working medium filling and adjusting system, the mixed refrigerant system pipeline 2 is connected with the upper part of the refrigerant liquid storage tank 1 through the ball valve 8, so that the pressure intensity of the refrigerant liquid storage tank 1 and the mixed refrigerant system pipeline 2 can be balanced.
In the novel mixed working medium filling and adjusting system, the refrigerant is filled into the refrigerant liquid storage tank 1 in advance, and the refrigerant liquid storage tank 1 is provided with the ball valve 8 connected with the refrigerating system.
In the novel mixed working medium filling and adjusting system, the refrigerant liquid storage tank 1 is connected with the mixed refrigerant system pipeline 2 of the refrigerating system through the ball valve 8 and the check valve 9 and is used for injecting the refrigerant into the refrigerant system pipeline 2.
In the novel mixed working medium filling and adjusting system, the refrigerant liquid storage tank 1 is vacuumized to the required pressure and is continued for the required time (at least 1h), the vacuum degree of the system is ensured to be less than or equal to 10Pa, and the gas vacuumized by the vacuum pump 3 is discharged to the gas collection tank 4.
In the novel mixed working medium filling and adjusting system, the ball valve 8 and the check valve 9 between the refrigerant liquid storage tank 1 and the refrigerant system pipeline 2 are opened, so that low-pressure refrigerant enters the refrigerant system pipeline 2 through gravity, and the filling of the refrigerant is completed.
In the novel mixed working medium filling and adjusting system, the ball valve 8 and the check valve 9 are connected with the mixed refrigerant system pipeline 2 of the refrigerating system through welding or bell mouth, the refrigerating system is a self-overlapping refrigerating system, and the refrigerant is a multi-element mixed refrigerant.
In order to further illustrate the novel mixed working medium filling and adjusting system, the following examples are adopted to illustrate the specific operation implementation process of the invention.
Example 1
A novel mixed working medium filling and adjusting system is shown in figure 1, and a refrigerant is an environment-friendly ternary non-azeotropic high condensation temperature refrigerant and is characterized in that: the refrigerant comprises a mixed working medium refrigerant of R142b (with the saturation pressure of 0.195MPa), R134a (with the saturation pressure of 0.401MPa) and R22 (with the saturation pressure of 0.661MPa), wherein the sum of the mass percent concentrations of all the components in the mixed refrigerant is 100 percent, wherein the mass percent of R142b is 5-35 percent, the mass percent of R134a is 1-10 percent, and the mass percent of R22 is 60-90 percent; in the embodiment, 15% by mass of R142b, 10% by mass of R134a, and 75% by mass of R22 are selected. Assuming that the refrigeration system lacks low pressure refrigerant R134a and needs to be charged with R134a refrigerant, the low pressure R134a refrigerant charge is set at about 62g and the known receiver tank volume is about 17L. The amount of low pressure refrigerant is matched to the refrigeration system.
In this embodiment, a novel mixed working medium charging and adjusting system is adopted to charge a low-pressure refrigerant into a refrigeration system, and the charging method includes the following steps:
1) as shown in fig. 1, the instrument tests: whether equipment and instruments such as a refrigerant liquid storage tank 1, a lifting platform 5, a check valve 9, a weighing electronic scale 6, a vacuum pump 3, a gas collecting tank 4, a manifold pressure gauge 7, a ball valve 8, a safety valve 10, a thermometer 11, a pressure gauge 12 and the like are damaged or leaked is detected, and if damaged, the equipment and instruments are replaced in time. The lifting platform 5 is arranged below the refrigerant liquid storage tank 1, so that the refrigerant liquid storage tank 1 is lifted or lowered to be 30-50cm higher than the mixed refrigerant system pipeline 2, and in the embodiment, the refrigerant liquid storage tank 1 is controlled to be about 40cm higher than the refrigerant system pipeline 2.
2) As shown in fig. 1, the refrigerant reservoir 1 is evacuated: opening the ball valve 8, and connecting the high-pressure side of the manifold pressure gauge 7 with the hand valve of the vacuum pump 3 by using a hose; closing all ball valves 8 except the pipelines connecting the vacuum pump 3 and the refrigerant liquid storage tank 1, opening the hand valve of the vacuum pump 3 and the hand valve at the high-pressure side of the manifold pressure gauge 7, starting the vacuum pump 3, and starting the vacuum pumping operation; the duration time of the vacuumizing is more than 1h, the duration time is longer, the vacuumizing is carried out, the vacuum degree of the system is ensured to be less than or equal to 10Pa, and the gas pumped by the vacuum pump 3 is discharged into the gas collection tank 4; during the vacuum pumping process, the temperature meter 11 and the pressure gauge 12 on the upper part of the refrigerant liquid storage tank 1 are observed at the moment, and the system stops immediately once abnormality is found. After the evacuation, the vacuum pump 3 was turned off, and the high-pressure side pressure-resistant hose of the manifold pressure gauge 7 was removed.
3) As shown in fig. 1, the refrigerant charged into the refrigerant reservoir 1: connecting the low-pressure side of the manifold pressure gauge 7 with a refrigerant charging tank (a tank body with low pressure R134a for charging the refrigerant liquid storage tank 1 with low pressure R134a, taking fig. 1 as an example, the charging tank is a source for charging the refrigerant) by using a pressure-resistant hose; at the moment, firstly, evacuating air in the hose, unscrewing the joint of the hose and the low-pressure side of the manifold pressure gauge 7, opening a valve of a refrigerant filling tank, hearing hissing sound at the unscrewed joint of the hose and the low-pressure side of the manifold pressure gauge 7, closing the valve of the refrigerant filling tank when white gas appears, and evacuating air in the hose by using the refrigerant; after the evacuation, become vacuum state in the refrigerant liquid storage pot 1, only need to increase manifold pressure gauge 7 low pressure side manual valve aperture this moment, open ball valve 8, the refrigerant is impressed in refrigerant liquid storage pot 1 by oneself, according to required low pressure refrigerant volume of filling (the volume of low pressure refrigerant matches with refrigerating system), observes weighing electronic scale 6 below the refrigerant liquid storage pot 1, when filling the filling and be close required refrigerant volume, reduces manifold pressure gauge 7 low pressure side manual valve aperture, until closing. At the end of the filling, the ball valve 8 is closed.
4) As shown in fig. 1, the low pressure refrigerant of the refrigerant receiver 1 enters the mixed refrigerant system pipe 2: when the low-pressure refrigerant is filled, the ball valve 8 is opened to balance the pressure of the refrigerant liquid storage tank 1 and the mixed refrigerant system pipeline 2, the ball valve 8 and the check valve 9 are opened to enable the low-pressure refrigerant filled in the refrigerant liquid storage tank 1 to flow into the mixed refrigerant system pipeline 2 under the action of gravity, and the low-pressure refrigerant enters the refrigerating system to finish the operation.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A mixed working medium filling and adjusting system is characterized by comprising a refrigerant liquid storage tank (1), a refrigerant system pipeline (2), a vacuum pump (3) and a gas collection tank (4);
the refrigerant liquid storage tank (1) is respectively communicated with the air inlet end of the vacuum pump (3) and the refrigerant system pipeline (2) through pipelines, and the air outlet end of the vacuum pump (3) is communicated with the air collecting tank (4) through a pipeline;
the refrigerant liquid storage tank (1) is higher than a refrigerant system pipeline (2);
after the refrigerant liquid storage tank (1) is vacuumized by the vacuum pump (3), the refrigerant enters the refrigerant liquid storage tank (1) under the action of negative pressure and then enters the refrigerant system pipeline (2) under the action of gravity.
2. The mixed working medium filling and adjusting system as claimed in claim 1, characterized in that the refrigerant liquid storage tank (1) is arranged 30-50cm higher than the refrigerant system pipe (2).
3. The mixed working medium filling and adjusting system as claimed in claim 1, characterized by further comprising a lifting platform (5) disposed below the refrigerant liquid storage tank (1) for adjusting the height of the refrigerant liquid storage tank (1).
4. The mixed working medium filling and adjusting system as claimed in claim 1, characterized in that the system further comprises an electronic weighing scale (6), wherein the electronic weighing scale (6) is arranged below the refrigerant liquid storage tank (1) and is used for weighing the mass of the refrigerant in the refrigerant liquid storage tank (1).
5. A mixed working medium filling and adjusting system as claimed in claim 4, characterized in that the precision of the weighing electronic scale (6) is 1 g.
6. A mixed working medium filling and adjusting system according to claim 1, characterized in that the displacement of the vacuum pump (3) is not less than 20L/min; the vacuumizing time is at least 1h until the vacuum degree in the refrigerant liquid storage tank (1) is less than or equal to 10 Pa.
7. The mixed working medium filling and adjusting system according to claim 1, characterized in that a manifold pressure gauge (7) is further arranged between the vacuum pump (3) and the refrigerant liquid storage tank (1), and the vacuum pump (3) and the manifold pressure gauge (7) and the refrigerant liquid storage tank (1) are connected through pressure-resistant hoses.
8. The mixed working medium filling and adjusting system as claimed in claim 7, characterized in that the vacuum degree measuring range of the low pressure side of the manifold pressure gauge (7) is 0-101kPa, the pressure measuring scale is started from 0kPa, and the measuring range is not lower than 2110 kPa; the pressure measurement scale of the high pressure side of the manifold pressure gauge (7) is started from 0kPa, and the measuring range is not lower than 4200 kPa.
9. The mixed working medium filling and adjusting system as claimed in claim 1, characterized in that the top of the refrigerant storage tank (1) is communicated with the refrigerant system pipeline (2) through a pipeline, and a ball valve (8) is arranged on the pipeline; the top of the refrigerant liquid storage tank (1) is communicated with the refrigerant system pipeline (2) by opening the ball valve (8), so that the internal pressures of the refrigerant liquid storage tank (1) and the refrigerant system pipeline (2) are balanced.
10. The mixed working medium filling and adjusting system as claimed in claim 1, characterized in that a check valve (9) is arranged on a pipeline connecting the vacuum pump (3) and the gas collection tank (4), and a ball valve (8) and the check valve (9) are sequentially arranged on a pipeline connecting the refrigerant storage tank (1) and the refrigerant system pipeline (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210503557.1A CN114812023B (en) | 2022-05-09 | Mixed working medium filling adjusting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210503557.1A CN114812023B (en) | 2022-05-09 | Mixed working medium filling adjusting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114812023A true CN114812023A (en) | 2022-07-29 |
| CN114812023B CN114812023B (en) | 2024-05-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111981732A (en) * | 2020-07-24 | 2020-11-24 | 中标能效科技（北京）有限公司 | Automatic refrigerant filling device and method |
| CN215983383U (en) * | 2021-10-19 | 2022-03-08 | 宁波奥克斯电气股份有限公司 | Refrigerant charging device and refrigeration equipment |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111981732A (en) * | 2020-07-24 | 2020-11-24 | 中标能效科技（北京）有限公司 | Automatic refrigerant filling device and method |
| CN215983383U (en) * | 2021-10-19 | 2022-03-08 | 宁波奥克斯电气股份有限公司 | Refrigerant charging device and refrigeration equipment |
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