Automobile refrigerant recycling and filling machine

Abstract

The utility model discloses an automobile refrigerant recycling and filling machine, and belongs to the technical field of automobiles. The automobile refrigerant filling machine solves the problems that in the prior art, an automobile refrigerant filling machine cannot treat refrigerants recycled from an air conditioner, and when lubricating oil is filled into the air conditioner system, the oil content of lubricating oil of the refrigerants in the air conditioner system does not meet the set requirement easily. The device mainly comprises a mixed liquid storage tank, a refrigerant liquid storage tank, a lubricating oil storage bottle, a liquid pump, a vacuum pump and an air conditioner connecting pipe, a first pipeline and a second pipeline are installed on the upper side and the lower side of the mixed liquid storage tank respectively, a tank opening of the refrigerant liquid storage tank is connected with a refrigerant liquid outlet pipe, and the refrigerant liquid outlet pipe is connected with a third pipeline and a fourth pipeline respectively. A bottle opening of the lubricating oil storage bottle is connected with a fifth pipeline, a liquid inlet of the liquid pump is connected with a liquid inlet pipe, the liquid inlet pipe is connected with the second pipeline, the third pipeline, the fifth pipeline and the sixth pipeline, a liquid outlet of the liquid pump is connected with a liquid outlet pipe, and the liquid outlet pipe is connected with the first pipeline and the seventh pipeline.

Description

Technical Field

[0001] This utility model belongs to the field of automotive technology, and more specifically, it relates to an automotive refrigerant recovery and charging machine. Background Technology

[0002] A refrigerant charging machine is a device used to add refrigerant to a car's air conditioning system. Many existing refrigerant charging machines also recover refrigerant while adding it to the system. However, while current machines can recover refrigerant, they cannot process the recovered refrigerant. Furthermore, with long refrigerant charging pipes, refrigerant residue can easily remain in the pipes. The refrigerant in the air conditioning system contains a certain amount of lubricating oil. Currently, when adding refrigerant, the oil content and amount of remaining refrigerant cannot be detected, making it difficult to accurately calculate the amount of lubricating oil to be added. This can easily lead to the oil content of the refrigerant in the air conditioning system not meeting the set requirements. Summary of the Invention

[0003] The purpose of this invention is to provide an automotive refrigerant recovery and charging machine to overcome the problems in the prior art where automotive refrigerant charging machines cannot process refrigerant recovered from the air conditioner, and where the oil content of the refrigerant in the air conditioning system does not meet the set requirements when charging refrigerant into the air conditioning system.

[0004] This utility model is achieved by the following technical solution: an automotive refrigerant recovery and refueling machine, comprising a mixing tank, a refrigerant tank, a lubricating oil reservoir, a liquid pump, a vacuum pump, and an air conditioning connection pipe;

[0005] The mixing tank is equipped with a first pipeline and a second pipeline on its upper and lower sides, respectively, and a first solenoid valve and a second solenoid valve are installed on the first pipeline and the second pipeline, respectively.

[0006] The refrigerant storage tank is connected to a refrigerant outlet pipe at its opening. The refrigerant outlet pipe is connected to a third pipe and a fourth pipe, respectively. A third solenoid valve and a fourth solenoid valve are installed on the third pipe and the fourth pipe, respectively.

[0007] The lubricating oil storage bottle is connected to a fifth pipeline, and a fifth solenoid valve is installed on the fifth pipeline;

[0008] The liquid pump's inlet is connected to an inlet pipe, which is connected to a second pipe, a third pipe, a fifth pipe, and a sixth pipe. A sixth solenoid valve is installed on the sixth pipe.

[0009] The outlet of the liquid pump is connected to the outlet pipe, which is connected to the first pipeline and the seventh pipeline respectively. The seventh solenoid valve is installed on the seventh pipeline.

[0010] The air conditioning connecting pipe is connected to the sixth pipe, the seventh pipe and the eighth pipe respectively, and the eighth solenoid valve is installed on the eighth pipe;

[0011] The inlet of the vacuum pump is connected to the air inlet pipe, which is connected to the fourth pipe and the eighth pipe respectively.

[0012] The outlet of the vacuum pump is connected to an exhaust pipe.

[0013] Furthermore, the inlet of the refrigerant storage tank is connected to the refrigerant outlet pipe via a flexible hose.

[0014] Furthermore, a stirrer is installed on the top of the mixing tank; a pressure sensor is also installed inside the mixing tank.

[0015] Furthermore, it also includes a housing, in which the mixing liquid tank, refrigerant liquid tank, lubricating oil storage bottle, liquid pump and vacuum pump are all installed; the air conditioning connecting pipe is connected to the connecting branch pipes on both sides through a tee pipe, and the interfaces on the connecting branch pipes on both sides extend out of the housing; a door is installed at the front end of the housing; an operation panel is installed on the housing, and the operation panel is connected to a controller; and rollers are installed at the bottom of the housing.

[0016] Furthermore, a drain pipe is installed at the bottom of the mixing storage tank, and a valve is installed on the drain pipe; the vent pipe is connected to the drain pipe, and the connection point between the vent pipe and the drain pipe is outside the valve.

[0017] Furthermore, a vertically arranged sight glass is installed on the mixing tank, with an upper connecting pipe and a lower connecting pipe connected to the upper and lower ends of the sight glass, respectively, and the upper connecting pipe and the lower connecting pipe are respectively connected to the mixing tank; the sight glass is provided with a long strip-shaped window, and a transparent lens is installed on the window.

[0018] Furthermore, an oil content detector is installed on the pipeline formed by the inlet pipe and the second pipeline, as well as on the pipeline formed by the inlet pipe and the sixth pipeline.

[0019] Furthermore, an oil content detector is installed on the liquid inlet pipe.

[0020] Furthermore, the mixing tank, refrigerant tank, and lubricating oil reservoir are all mounted on an electronic scale.

[0021] Furthermore, the first pipeline includes a first branch and a second branch connected in parallel. The first solenoid valve includes a first branch solenoid valve installed on the first branch and a second branch solenoid valve installed on the second branch. The first branch solenoid valve is installed on the side of the first branch closer to the liquid pump, and the second branch solenoid valve is installed on the side of the second branch closer to the liquid pump. An air conditioning assembly is connected to the second branch. The air conditioning assembly includes an evaporator, a compressor, and a condenser connected in sequence. An electronic expansion valve is installed on the lower side of the air conditioning assembly in the second branch.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This invention mixes and stirs the old refrigerant extracted from the air conditioning system with the new refrigerant in the refrigerant reservoir to form a mixed refrigerant, which is then delivered to the air conditioning system. This effectively solves the problem in existing automotive refrigerant charging machines that cannot process refrigerant recovered from the air conditioning system.

[0024] This invention, by incorporating an oil content detector, can measure the oil content of the refrigerant in the air conditioning system and the refrigerant in the mixing tank. By measuring the weight of the refrigerant delivered from the mixing tank to the air conditioning system using an electronic scale, and determining its oil content, the required mass of lubricating oil to be added to the air conditioning system can be calculated. Finally, a specific mass of lubricating oil is added to the air conditioning system using the electronic scale, ensuring that the oil content of the refrigerant in the air conditioning system meets the requirements. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a perspective view of the present invention;

[0027] Figure 3 , Figure 4 and Figure 5 These are schematic diagrams showing different directions of the refrigerant recovery and charging pipeline in this utility model;

[0028] Figure 6 and Figure 7 These are partial schematic diagrams of different directions of the refrigerant recovery and charging pipeline in this utility model.

[0029] In the diagram: 1. Mixing liquid receiver; 2. Refrigerant receiver; 3. Lubricating oil reservoir; 4. Liquid pump; 5. Vacuum pump; 6. Air conditioning connection pipe; 7. First pipeline; 8. Second pipeline; 9. First solenoid valve; 10. Second solenoid valve; 11. Refrigerant outlet pipe; 12. Third pipeline; 13. Fourth pipeline; 14. Third solenoid valve; 15. Fourth solenoid valve; 16. Fifth pipeline; 17. Fifth solenoid valve; 18. Inlet pipe; 19. Sixth pipeline; 20. Sixth solenoid valve; 21. Electronic expansion valve; 22. Seventh pipeline; 23. Seventh solenoid valve 24. Eighth Pipeline; 25. Eighth Solenoid Valve; 26. Inlet Pipe; 27. Outlet Pipe; 28. Hose; 29. ​​Agitator; 30. Housing; 31. Connecting Branch Pipe; 32. Door; 33. Control Panel; 34. Roller; 35. Drain Pipe; 36. Valve; 37. Sight Pipe; 38. Upper Connecting Pipe; 39. Lower Connecting Pipe; 40. Oil Content Detector; 41. Electronic Scale; 42. First Branch; 43. Second Branch; 44. First Branch Solenoid Valve; 45. Second Branch Solenoid Valve; 46. Evaporator; 47. Compressor; 48. Condenser. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort should fall within the scope of protection of this utility model.

[0031] An automotive refrigerant recovery and refueling machine includes a mixing reservoir 1, a refrigerant reservoir 2, a lubricating oil reservoir 3, a liquid pump 4, a vacuum pump 5, and an air conditioning connection pipe 6. The mixing reservoir 6 is used to store used refrigerant extracted from the air conditioning system and to mix the used refrigerant with new refrigerant. The refrigerant reservoir 2 is used to store refrigerant. The lubricating oil reservoir 3 is used to store lubricating oil.

[0032] The mixing reservoir 1 has a first pipe 7 and a second pipe 8 installed on its upper and lower sides, respectively. A first solenoid valve 9 and a second solenoid valve 10 are installed on the first pipe 7 and the second pipe 8, respectively. The other end of the first pipe 7 is connected to the outlet of a liquid pump 4, which can transport old refrigerant from the air conditioning system, new refrigerant from the refrigerant reservoir 2, and lubricating oil from the lubricating oil reservoir 3 to the mixing reservoir 1 via the first pipe 7. The other end of the second pipe 8 is connected to the inlet of the liquid pump 4, which can transport the refrigerant from the mixing reservoir 1 to the air conditioning system via the second pipe 8.

[0033] The refrigerant storage tank 2 has a refrigerant outlet pipe 11 connected to its opening. The refrigerant outlet pipe 11 is connected to a third pipe 12 and a fourth pipe 13 via a T-junction. A third solenoid valve 14 and a fourth solenoid valve 15 are installed on the third pipe 12 and the fourth pipe 13, respectively. The third pipe 12 is connected to the inlet of the liquid pump 4, which can then transport the refrigerant from the refrigerant storage tank 2 to the mixing storage tank 1 or the air conditioning system. The fourth pipe 13 is connected to the air conditioning connection pipe 6.

[0034] The neck of the lubricating oil storage bottle 3 is connected to the fifth pipeline 16, and a fifth solenoid valve 17 is installed on the fifth pipeline 16. The fifth pipeline 16 is connected to the inlet of the liquid pump 4, and the liquid pump 4 delivers the lubricating oil in the lubricating oil storage bottle 3 to the mixing storage tank 1 or the air conditioning system through the fifth pipeline 16.

[0035] The inlet of the liquid pump 4 is connected to the inlet pipe 18, which is connected to the second pipe 8, the third pipe 12, the fifth pipe 16 and the sixth pipe 19 through a five-way pipe. The sixth solenoid valve 20 is installed on the sixth pipe 19.

[0036] The outlet of the liquid pump 4 is connected to the outlet pipe, which is connected to the first pipe 7 and the seventh pipe 22 via a three-way pipe. The seventh solenoid valve 23 is installed on the seventh pipe 22.

[0037] The air conditioning connecting pipe 6 is connected to the sixth pipe 19, the seventh pipe 22, and the eighth pipe 24 via a four-way pipe. The eighth solenoid valve 25 is installed on the eighth pipe 24. The air conditioning connecting pipe 6 is connected to the two connecting branch pipes 31 via a three-way pipe. The interfaces on the two connecting branch pipes 31 extend out of the housing 30. The connectors on the two connecting branch pipes 31 can be connected to the high-pressure pipe and the low-pressure pipe of the air conditioning system via pipes. Electronic pressure gauges are installed on the pipes connecting the branch pipe 31 to the high-pressure pipe and the pipes connecting the branch pipe 31 to the low-pressure pipe.

[0038] The inlet of the vacuum pump 5 is connected to the inlet pipe 26, which is connected to the fourth pipe 13 and the eighth pipe 24 respectively. The outlet of the vacuum pump 5 is connected to the outlet pipe 27. The vacuum pump 5 can evacuate the air conditioning system through the eighth pipe 24 and evacuate the refrigerant storage tank 2 through the fourth pipe 13. During the evacuation process, the vacuum pump 5 can also extract the residual refrigerant in the air conditioning system and discharge it through the outlet pipe 27. The vacuum pump 5 can also extract air from the refrigerant storage tank 2 and the connected pipes.

[0039] The outlet of the vacuum pump 5 is connected to the air outlet pipe 27.

[0040] The refrigerant storage tank 2 is connected to the refrigerant outlet pipe 11 via a hose 28. The hose 28 on the refrigerant storage tank 2 can be separated from the refrigerant outlet pipe 11 and connected to an external pipeline, so that refrigerant can be charged into the refrigerant storage tank 2 through the external pipeline, or a new refrigerant storage tank 2 can be directly replaced by separating the hose 28 from the refrigerant outlet pipe 11.

[0041] A stirrer 29 is installed on the top of the mixing tank 1; a pressure sensor is also installed inside the mixing tank 1. This invention, by incorporating the stirrer 29, can thoroughly mix the old refrigerant, new refrigerant, and lubricating oil in the mixing tank 1, ensuring a uniform distribution of these components. The pressure sensor can detect the pressure inside the mixing tank 1.

[0042] It also includes a housing 30, in which the mixing liquid tank 1, refrigerant liquid tank 2, lubricating oil storage bottle 3, liquid pump 4 and vacuum pump 5 are all installed. The housing 30 has a square structure, and a door 32 is installed at the front end of the housing 30. Rollers 34 are installed at the bottom of the housing 30.

[0043] An operation panel 33 is mounted on the housing 30, and the operation panel 33 is connected to the controller. This utility model can be controlled via the operation panel 33, which may include a touch screen with various command switches.

[0044] The bottom of the mixing storage tank 1 is equipped with a drain pipe 35, and a valve 36 is installed on the drain pipe 35. By setting the drain pipe 35, the refrigerant in the mixing storage tank 1 can be easily emptied.

[0045] The vent pipe 27 is connected to the drain pipe 35. The connection point between the vent pipe 27 and the drain pipe 35 is on the outside of the valve 36, that is, between the valve 36 and the mixing storage tank 1 at the connection point.

[0046] The mixing tank 1 is equipped with a vertically arranged sight glass 37. The upper and lower ends of the sight glass 37 are connected to an upper connecting pipe 38 and a lower connecting pipe 39, respectively, which are connected to the mixing tank 1. The sight glass 37 has an elongated window with a transparent lens. This invention, by providing the sight glass 37, allows for convenient observation of the amount of refrigerant in the mixing tank 1. The sight glass 37 can be equipped with graduations to facilitate observation of the amount of refrigerant in the mixing tank 1.

[0047] Oil content detectors 40 are installed on both the pipeline connecting the liquid inlet pipe 18 and the second pipeline 8, and on the pipeline connecting the liquid inlet pipe 18 and the sixth pipeline 19. This invention, by installing oil content detectors 40 on the pipeline connecting the liquid inlet pipe 18 and the second pipeline 8, can detect the oil content of the refrigerant passing through this pipeline, i.e., detect the oil content of the refrigerant in the mixing tank 1; this invention, by installing oil content detectors 40 on the pipeline connecting the liquid inlet pipe 18 and the sixth pipeline 19, can detect the oil content of the refrigerant passing through this pipeline, i.e., detect the oil content of the refrigerant in the air conditioning system.

[0048] An oil content detector 40 is installed on the inlet pipe 18. This invention, by installing the oil content detector 40 on the inlet pipe 18, allows the oil content detector 40 to be installed on the following pipelines: the pipeline connecting the inlet pipe 18 and the second pipeline 8, the pipeline connecting the inlet pipe 18 and the third pipeline 12, the pipeline connecting the inlet pipe 18 and the fifth pipeline 16, and the pipeline connecting the inlet pipe 18 and the sixth pipeline 19. This enables the detection of the oil content of the liquid flowing through these pipelines.

[0049] The mixing liquid storage tank 1, refrigerant storage tank 2, and lubricating oil storage bottle 3 are all mounted on an electronic scale 41. This invention, by incorporating an electronic scale 41, can detect the total weight change of the mixing liquid storage tank 1, refrigerant storage tank 2, and lubricating oil storage bottle 3, thereby achieving precise delivery of a certain mass of refrigerant and lubricating oil to the air conditioning system.

[0050] The electronic scale 41 is installed at the bottom of the housing 30. A shockproof platform is also provided at the bottom of the electronic scale 41. A partition is installed on the upper side of the electronic scale 41 in the housing 30. The liquid pump 4 and the vacuum pump 5 are both installed on the partition.

[0051] The first pipeline 7 includes a first branch 42 and a second branch 43 connected in parallel. The first solenoid valve 9 includes a first branch solenoid valve 44 installed on the first branch 42 and a second branch solenoid valve 45 installed on the second branch 43. When both the first branch solenoid valve 44 and the second branch solenoid valve 45 are in the closed state, the first solenoid valve 9 can be in the closed state. When one of the first branch solenoid valve 44 and the second branch solenoid valve 45 is in the open state or both are in the open state, the first solenoid valve 9 is in the open state.

[0052] The first branch solenoid valve 44 is installed on the side of the first branch 42 near the liquid pump 4, and the second branch solenoid valve 45 is installed on the side of the second branch 43 near the liquid pump 4. An air conditioning assembly is connected to the second branch 43, which includes an evaporator 46, a compressor 47, and a condenser 48 connected in sequence. An electronic expansion valve 21 is installed on the lower side of the air conditioning assembly in the second branch 43.

[0053] When recovering old refrigerant from the air conditioning system, we open the second branch solenoid valve 45 and close the first branch solenoid valve 44. The old refrigerant entering the mixing tank 1 from the air conditioning system needs to pass through the air conditioning components first. The old refrigerant first passes through the evaporator 46 of the air conditioning components. When the old refrigerant passes through the evaporator 46, it absorbs heat and becomes a gas (low temperature and low pressure) to prevent liquid slugging. Then the old refrigerant passes through the compressor 47 and becomes a high temperature and high pressure gas. Then it passes through the condenser 48 and becomes a high temperature and high pressure liquid. Then the old refrigerant passes through the lower electronic expansion valve 21 and becomes a low temperature and high pressure liquid. Finally, the old refrigerant enters the mixing tank 1.

[0054] When it is necessary to introduce refrigerant from refrigerant storage tank 2 or lubricating oil from lubricating oil storage bottle 3 into mixing storage tank 1, or when it is necessary to test the oil content of refrigerant in mixing storage tank 1, we open the first branch solenoid valve 44 and close the second branch solenoid valve 45.

[0055] The working process of this utility model: This utility model can achieve different functions by opening and closing different solenoid valves and liquid pump 4 and vacuum pump 5. The control buttons can be set on the operation panel 33. The operation panel 33 is connected to the controller, and the controller controls the opening and closing of the solenoid valve, vacuum pump 5 and liquid pump 4.

[0056] After replacing the refrigerant storage tank 2 or adding refrigerant to the refrigerant storage tank 2, the present invention can perform a pre-emptive evacuation process on the refrigerant storage tank 2. During evacuation, the fourth solenoid valve 15 on the fourth pipeline 13 is first opened, and the other solenoid valves are closed. Then, the vacuum pump 5 is turned on. The vacuum pump 5 can expel the air from the refrigerant storage tank 2 and its connected pipelines. After expelling the air, the fourth solenoid valve 15 is closed.

[0057] When the refrigerant in the refrigerant receiver tank 2 is directly added to the air conditioning system, the third solenoid valve 14 on the third pipeline 12 and the seventh solenoid valve 23 on the seventh pipeline 22 are opened first, while the other solenoid valves are closed. The liquid pump 4 is then turned on, and the liquid pump 4 delivers the refrigerant in the refrigerant receiver tank 2 to the air conditioning system. During the delivery process to the air conditioning system, the electronic scale 41 will detect the weight change. We can input the weight of the refrigerant to be added in advance on the operation panel 33. When the weight reaches the set value, the controller controls the liquid pump 4, the third solenoid valve 14 and the seventh solenoid valve 23 to close.

[0058] When the lubricating oil in the lubricating oil reservoir is directly added to the air conditioning system, the fifth solenoid valve 17 on the fifth pipeline 16 and the seventh solenoid valve 23 on the seventh pipeline 22 are opened first, while the other solenoid valves are closed. The liquid pump 4 is then turned on, and the liquid pump 4 delivers the lubricating oil in the lubricating oil reservoir to the air conditioning system. During the delivery process to the air conditioning system, the electronic scale 41 will detect the weight change. We can input the weight of the lubricating oil to be added in advance on the operation panel 33. When the weight reaches the set value, the controller controls the liquid pump 4, the fifth solenoid valve 17 and the seventh solenoid valve 23 to close.

[0059] When it is necessary to recover the refrigerant from the air conditioning system, first open the sixth solenoid valve 20 on the sixth pipe 19, the second branch solenoid valve 45 on the second branch 43, and the liquid pump 4. Close the other solenoid valves. The liquid pump 4 delivers the old refrigerant from the air conditioning system to the mixed liquid receiver 1. When the old refrigerant enters the liquid pump 4 through the sixth pipe 19, it will pass through the oil content detector 40. The oil content detector 40 will detect the oil content of the old refrigerant entering the mixed liquid receiver 1. Finally, close the sixth solenoid valve 20 on the sixth pipe 19, the second branch solenoid valve 45 on the second branch 43, and the liquid pump 4. Then open the eighth solenoid valve 25 on the eighth pipe 24 and the vacuum pump 5. The vacuum pump 5 evacuates the air conditioning system, and the extracted residual old refrigerant is discharged from the outlet pipe 27.

[0060] When it is necessary to mix old and new refrigerant in mixing tank 1, we can first determine the amount of new refrigerant solution to be supplied to mixing tank 1 based on the liquid level of the old refrigerant solution entering mixing tank 1. Then, we open the third solenoid valve 14 on the third pipeline 12, the first branch solenoid valve 44 on the first branch 42, and the liquid pump 4, while closing the other solenoid valves. This allows the new refrigerant in refrigerant tank 2 to be supplied to mixing tank 1. By observing the sight glass 37, when the required solution level is reached, we close the third solenoid valve 14 on the third pipeline 12, the first branch solenoid valve 44 on the first branch 42, and the liquid pump 4. Finally, we start the stirrer 29 to thoroughly mix the new and old refrigerant in mixing tank 1.

[0061] When refrigerant needs to be added to the air conditioning system via the mixing receiver tank 1, we can first open the second solenoid valve 10 on the second pipeline 8, the seventh solenoid valve 23 on the seventh pipeline 22, and the liquid pump 4, while closing the other solenoid valves. The liquid pump 4 will then deliver the refrigerant from the mixing receiver tank 1 to the air conditioning system. As the refrigerant from the mixing receiver tank 1 is delivered to the liquid pump 4, it first passes through an oil content detector 40. The oil content detector 40 detects the oil content of the refrigerant entering the air conditioning system, and simultaneously, an electronic scale 41 detects the weight of the refrigerant entering the system. Finally, based on the oil content and the weight of the refrigerant entering the system, the required mass of lubricating oil to be added to the air conditioning system is calculated. Finally, the electronic scale 41 accurately adds a certain mass of lubricating oil to the air conditioning system, ensuring that the oil content of the refrigerant in the air conditioning system remains within the required range.

[0062] When it is necessary to test the oil content of the refrigerant in the air conditioning system, we can open only the sixth solenoid valve 20 on the sixth pipe 19 and close the other solenoid valves. Driven by the pressure difference, the refrigerant in the air conditioning system will enter the sixth pipe 19 and the liquid inlet pipe 18, and at the same time pass through the oil content detector 40. The oil content detector 40 will detect the oil content of the refrigerant in the air conditioning system. The tested refrigerant can be reintroduced into the air conditioning system through the liquid pump 4 or into the mixed liquid receiver 1.

[0063] When it is necessary to detect the oil content of the refrigerant in the mixed liquid storage tank 1, we can open the second solenoid valve 10 on the second pipeline 8, the first branch solenoid valve 44 on the first branch 42 and the liquid pump 4, and close the other solenoid valves. The liquid pump 4 drives the refrigerant in the mixed liquid storage tank 1 from the second pipeline 8 into the first branch 42 and back into the mixed liquid storage tank 1. At the same time, the refrigerant will pass through the oil content detector 40 on the liquid inlet pipe 18.

Claims

1. A refrigerant recovery and charging machine for automobiles, characterized in that, Includes a mixing tank (1), a refrigerant tank (2), a lubricating oil reservoir (3), a liquid pump (4), a vacuum pump (5), and an air conditioning connection pipe (6); The mixing storage tank (1) has a first pipeline (7) and a second pipeline (8) installed on its upper and lower sides respectively, and a first solenoid valve (9) and a second solenoid valve (10) are installed on the first pipeline (7) and the second pipeline (8) respectively. The refrigerant storage tank (2) is connected to a refrigerant outlet pipe (11), which is connected to a third pipe (12) and a fourth pipe (13). A third solenoid valve (14) and a fourth solenoid valve (15) are installed on the third pipe (12) and the fourth pipe (13), respectively. The bottle neck of the lubricating oil storage bottle (3) is connected to the fifth pipeline (16), and the fifth solenoid valve (17) is installed on the fifth pipeline (16); The liquid pump (4) is connected to the inlet pipe (18), which is connected to the second pipe (8), the third pipe (12), the fifth pipe (16) and the sixth pipe (19) respectively. The sixth solenoid valve (20) is installed on the sixth pipe (19). The outlet of the liquid pump (4) is connected to the outlet pipe, which is connected to the first pipeline (7) and the seventh pipeline (22) respectively. The seventh solenoid valve (23) is installed on the seventh pipeline (22). The air conditioning connecting pipe (6) is connected to the sixth pipe (19), the seventh pipe (22) and the eighth pipe (24) respectively, and the eighth solenoid valve (25) is installed on the eighth pipe (24); The inlet of the vacuum pump (5) is connected to the air inlet pipe (26), and the air inlet pipe (26) is connected to the fourth pipe (13) and the eighth pipe (24) respectively; The outlet of the vacuum pump (5) is connected to the air outlet pipe (27).

2. The automotive refrigerant recovery and charging machine according to claim 1, characterized in that, The opening of the refrigerant storage tank (2) is connected to the refrigerant outlet pipe (11) via a hose (28).

3. The automotive refrigerant recovery and charging machine according to claim 1, characterized in that, A stirrer (29) is installed on the top of the mixing tank (1); a pressure sensor is also installed inside the mixing tank (1).

4. The automotive refrigerant recovery and charging machine according to claim 1, characterized in that, It also includes a housing (30), in which the mixing liquid tank (1), refrigerant liquid tank (2), lubricating oil storage bottle (3), liquid pump (4) and vacuum pump (5) are all installed; the air conditioning connecting pipe (6) is connected to the connecting branch pipes (31) on both sides through a three-way pipe, and the interfaces on the connecting branch pipes (31) on both sides extend out of the housing (30); a door (32) is installed at the front end of the housing (30); an operation panel (33) is installed on the housing (30), and the operation panel (33) is connected to a controller; and rollers (34) are installed at the bottom of the housing (30).

5. The automotive refrigerant recovery and charging machine according to claim 1, characterized in that, A drain pipe (35) is installed at the bottom of the mixing storage tank (1), and a valve (36) is installed on the drain pipe (35); the vent pipe (27) is connected to the drain pipe (35), and the connection position between the vent pipe (27) and the drain pipe (35) is outside the valve (36).

6. The automotive refrigerant recovery and charging machine according to claim 1, characterized in that, The mixing tank (1) is equipped with a vertically arranged sight glass (37). The upper and lower ends of the sight glass (37) are connected to an upper connecting pipe (38) and a lower connecting pipe (39), respectively. The upper connecting pipe (38) and the lower connecting pipe (39) are connected to the mixing tank (1). The sight glass (37) is provided with a long strip-shaped window, and a transparent lens is installed on the window.

7. The automotive refrigerant recovery and charging machine according to claim 1, characterized in that, An oil content detector (40) is installed on the pipeline formed by the inlet pipe (18) and the second pipeline (8), as well as on the pipeline formed by the inlet pipe (18) and the sixth pipeline (19).

8. The automotive refrigerant recovery and charging machine according to claim 7, characterized in that, An oil content detector (40) is installed on the liquid inlet pipe (18).

9. The automotive refrigerant recovery and charging machine according to claim 1, characterized in that, The mixing tank (1), refrigerant tank (2) and lubricating oil storage bottle (3) are all mounted on an electronic scale (41).

10. The automotive refrigerant recovery and charging machine according to claim 1, characterized in that, The first pipeline (7) includes a first branch (42) and a second branch (43) connected in parallel. The first solenoid valve (9) includes a first branch solenoid valve (44) installed on the first branch (42) and a second branch solenoid valve (45) installed on the second branch (43). The first branch solenoid valve (44) is installed on the side of the first branch (42) near the liquid pump (4), and the second branch solenoid valve (45) is installed on the side of the second branch (43) near the liquid pump (4). An air conditioning assembly is connected to the second branch (43). The air conditioning assembly includes an evaporator (46), a compressor (47), and a condenser (48) connected in sequence. An electronic expansion valve (21) is installed on the lower side of the air conditioning assembly in the second branch (43).

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