Refrigerant oil filling device and method for air conditioner refrigerating system
By combining an oil reservoir, a three-way valve, a pressure gauge, a vacuum pump, and a refrigerant charger, the problems of leakage and slow speed in refrigerant oil charging in air conditioning refrigeration systems are solved, achieving rapid and reliable refrigerant oil replenishment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHERY AUTOMOBILE CO LTD
- Filing Date
- 2026-03-30
- Publication Date
- 2026-05-12
AI Technical Summary
There are problems with refrigerant leakage and air ingress when adding refrigeration oil to air conditioning systems, and the adding speed is slow.
The device employs a combination of an oil reservoir, a three-way valve, a pressure gauge, a vacuum pump, and a refrigerant charging device. By using the vacuum pump to extract air from the oil reservoir and replacing the refrigeration oil with high-pressure refrigerant, it achieves rapid refrigeration oil charging.
It improves the speed of refrigeration oil charging, avoids refrigerant leakage and air ingress, and ensures the lubrication effect of the compressor and the reliability of the system.
Smart Images
Figure CN122015343A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of refrigeration system maintenance technology, and in particular to a device and method for adding refrigeration oil to an air conditioning refrigeration system. Background Technology
[0002] As a core component of the air conditioning refrigeration system, the compressor requires lubrication with refrigerant oil to ensure the reliable operation of its internal moving parts. However, after prolonged operation, the amount of refrigerant oil in the compressor and the system piping gradually decreases, affecting the compressor's lubrication performance. Therefore, during the operation and maintenance of the air conditioning refrigeration system, it is necessary to regularly check and replenish the refrigerant oil.
[0003] In related technologies, since the air conditioning refrigeration system is a closed system, adding refrigeration oil often presents many inconveniences: when the system is stopped, there is a pressure difference between the compressor crankcase and the outside, and directly adding refrigeration oil can easily lead to refrigerant leakage or air entering the system; while adding oil while the system is running requires more complex operating skills and is slower. Summary of the Invention
[0004] Therefore, this disclosure provides a refrigerant oil charging device and method for an air conditioning refrigeration system, which helps to prevent refrigerant leakage and air from entering the air conditioning refrigeration system, while also improving the charging speed of the refrigerant oil in the air conditioning refrigeration system. The technical solution is as follows:
[0005] In a first aspect, a refrigerant oil charging device for an air conditioning refrigeration system is provided, the refrigerant oil charging device for the air conditioning refrigeration system includes an oil receiver, a three-way valve, a pressure gauge, a vacuum pump and a refrigerant charger; The oil reservoir has a gas inlet, an oil inlet, and an oil outlet. The gas inlet and the oil inlet are both located at the top of the oil reservoir, and the oil outlet is located at the bottom of the oil reservoir. The first end of the three-way valve is connected to the gas inlet; The pressure gauge is installed at the second end of the three-way valve and is used to monitor the air pressure in the oil reservoir. The vacuum pump and the refrigerant charger are respectively connected to the third end of the three-way valve. When the vacuum pump is connected to the third end of the three-way valve, the vacuum pump is used to extract air from the oil reservoir. When the refrigerant charger is connected to the third end of the three-way valve, the refrigerant charger is used to charge refrigerant gas into the oil reservoir.
[0006] In some possible implementations, the refrigerant chargeer is a refrigerant bottle or the high-pressure discharge end of the compressor of an air conditioning refrigeration system.
[0007] In some possible implementations, the oil inlet is provided with an oil inlet valve, which is used to control the connection state of the oil inlet.
[0008] In some possible implementations, the oil outlet is provided with an oil outlet valve, which is used to control the connection state of the oil outlet.
[0009] In a second aspect, a method for adding refrigeration oil to an air conditioning refrigeration system is provided, wherein the method uses any of the refrigeration oil adding devices for air conditioning refrigeration systems described in the first aspect.
[0010] In some possible implementations, the dispensing method includes the following steps: Open the oil inlet of the oil reservoir of the air conditioning refrigeration system refrigerant oil filling device, and add refrigerant oil into the oil reservoir through the oil inlet; Close the oil inlet and connect the vacuum pump of the air conditioning refrigeration system refrigerant oil filling device to the third end of the three-way valve of the air conditioning refrigeration system refrigerant oil filling device; Open the three-way valve and start the vacuum pump to extract the air from the oil reservoir until the pressure gauge of the air conditioning refrigeration system refrigerant oil filling device shows a negative pressure. After closing the three-way valve and disconnecting the vacuum pump from the third end of the three-way valve, connect the refrigerant charger of the air conditioning refrigeration system refrigeration oil charging device to the third end of the three-way valve. Open the three-way valve to charge refrigerant gas into the oil reservoir; Connect the oil outlet of the oil reservoir to the refrigerant oil filler of the air conditioning system. Open the oil outlet and add refrigerant oil into the air conditioning refrigeration system; After the refrigeration oil has been added, close the oil outlet.
[0011] In some possible implementations, when the refrigerant charger is a refrigerant bottle, the air conditioning refrigeration system is in a shutdown state; After charging the oil reservoir with refrigerant gas until the pressure inside the oil reservoir reaches the specified pressure and the oil outlet is connected to the refrigeration oil filler port of the air conditioning refrigeration system, first close the three-way valve and then open the oil outlet. Preferably, when the pressure inside the oil reservoir reaches the specified pressure, the reading of the pressure gauge is between 5 kgf / cm² and 8 kgf / cm².
[0012] In some possible implementations, when the oil inlet is closed, the refrigerant oil in the oil reservoir occupies 3 / 5 to 4 / 5 of the maximum volume of the oil reservoir; Preferably, when the oil inlet is closed, the refrigeration oil in the oil reservoir occupies 2 / 3 of the maximum volume of the oil reservoir.
[0013] In some possible implementations, when the refrigerant charger is the high-pressure discharge end of the compressor of the air conditioning refrigeration system, the air conditioning refrigeration system is in operation, and the refrigerant oil filler port of the air conditioning refrigeration system is the low-pressure suction end of the compressor.
[0014] In some possible implementations, when the oil inlet is closed, the refrigerant oil in the oil reservoir occupies 95% to 100% of the maximum volume of the oil reservoir; Preferably, when the oil inlet is closed, the refrigeration oil in the oil reservoir occupies 100% of the maximum volume of the oil reservoir.
[0015] In the scheme disclosed herein, refrigerant oil can be added to the oil reservoir through the oil inlet. Due to gravity, the refrigerant oil in the oil reservoir will not flow back out through the gas port. Thus, a vacuum pump can be connected to the third end of a three-way valve to extract air from the oil reservoir through the gas port, and then a refrigerant charging device can be connected to the third end of the three-way valve to charge high-pressure refrigerant into the oil reservoir through the gas port. Subsequently, the high-pressure refrigerant can be used to inject the refrigerant oil into the air conditioning system through the oil outlet located at the bottom of the oil reservoir. Since the air in the oil reservoir has been extracted and replaced with refrigerant with higher pressure, this not only increases the speed at which the refrigerant oil in the oil reservoir is forced into the air conditioning system, but also helps to prevent outside air from entering the air conditioning system and avoids refrigerant leakage. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of a refrigerant oil filling device for an air conditioning refrigeration system provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of the first air conditioning refrigeration system refrigerant oil filling device provided in this embodiment of the present disclosure when adding refrigerant oil; Figure 3 This is a schematic diagram of the structure of the second type of air conditioning refrigeration system refrigerant oil filling device provided in this embodiment of the present disclosure when adding refrigerant oil; Figure 4This is a schematic flowchart of the first method for adding refrigeration oil to an air conditioning refrigeration system provided in this disclosure. Figure 5 This is a schematic flowchart of the second method for adding refrigeration oil to an air conditioning refrigeration system provided in this embodiment.
[0018] Explanation of reference numerals in the attached figures 1. Oil reservoir; 11. Gas inlet; 12. Oil inlet; 121. Oil inlet valve; 13. Oil outlet; 131. Oil outlet valve; 2. Three-way valve; 3. Pressure gauge; 4. Vacuum pump; 5. Refrigerant charging device; 6. Air conditioning refrigeration system; 61. Compressor; 611. Low-pressure suction end. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.
[0020] An air conditioning refrigeration system 6 generally consists of a compressor 61, a condenser, an expansion valve, an evaporator, a condenser fan, and an evaporator fan. When the air conditioning refrigeration system 6 is operating, the compressor 61 compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas, which is then sent to the condenser through a high-pressure connecting pipe. In the condenser, heat is released, and the gas condenses into a high-pressure refrigerant liquid. After being throttled and depressurized by the expansion valve, the liquid enters the evaporator to evaporate and absorb heat. The refrigerant liquid evaporates and absorbs heat, becoming a low-pressure gas, which is then drawn back into the compressor 61 through the low-pressure connecting pipe. This cycle repeats, achieving the purpose of lowering the indoor temperature. A low-pressure valve can be installed as a bypass on the low-pressure connecting pipe, and a high-pressure valve can be installed as a bypass on the high-pressure connecting pipe. Opening the low-pressure and high-pressure valves allows the piping to be connected to the outside environment. For example, opening the low-pressure valve to connect to the oil outlet 13 of the air conditioning refrigeration system's refrigerant oil charging device allows for the replenishment of refrigerant oil.
[0021] When the air conditioner is operating, part of the refrigerant oil in the air conditioning refrigeration system 6 exists in the compressor 61, lubricating the moving parts inside the compressor 61. The other part of the refrigerant oil dissolves in the refrigerant and circulates with the refrigerant in the air conditioning refrigeration system piping. When the amount of refrigerant oil in the air conditioning refrigeration system piping decreases for some reason, the total amount of refrigerant oil inside the air conditioning refrigeration system will decrease. When the amount of refrigerant oil decreases to a certain level, the amount of refrigerant oil remaining in the compressor 61 to lubricate its moving parts will also decrease accordingly. The compressor 61 is prone to burnout and seizure due to insufficient lubrication of its internal components. Simultaneously, if air enters the circulation piping of the air conditioning refrigeration system 6, it can lead to problems such as ice blockage and corrosion, while also increasing system pressure and energy consumption, reducing cooling efficiency, and potentially damaging the compressor 61. Therefore, it is necessary to regularly replenish the refrigerant oil in the air conditioning refrigeration system 6 and prevent air from entering the circulation piping of the air conditioning refrigeration system 6.
[0022] Therefore, in a first aspect, this embodiment relates to a refrigerant oil charging device for an air conditioning refrigeration system, as shown in the reference. Figure 1 and Figure 2 As shown, the refrigerant oil charging device for this air conditioning refrigeration system includes an oil receiver 1, a three-way valve 2, a pressure gauge 3, a vacuum pump 4, and a refrigerant charging device 5. The oil receiver 1 can be a hollow container made of materials such as metal or plastic capable of containing both gas and liquid. Figure 1 As shown, the main body of the oil reservoir 1 can be cylindrical. However, in other possible embodiments, the main body of the oil reservoir 1 can also be a hollow container in the shape of a cuboid or a square.
[0023] refer to Figure 2 As shown, the oil reservoir 1 has a gas inlet 11, an oil inlet 12, and an oil outlet 13. The gas inlet 11 and the oil inlet 12 are both located at the top of the oil reservoir 1, and the oil outlet 13 is located at the bottom of the oil reservoir 1.
[0024] The oil inlet 12 can be connected to a fuel tank, fuel pump, or fuel dispenser via a pipeline, while the oil outlet 13 can be connected to the fuel filler port of the air conditioning refrigeration system 6 via a pipeline. Thus, refrigerant oil can be added to the oil reservoir 1 through the oil inlet 12. Simultaneously, the refrigerant oil in the oil reservoir 1 flows by gravity to the oil outlet 13 located at the bottom of the oil reservoir 1, and then flows sequentially through the oil outlet 13 and the fuel filler port of the air conditioning refrigeration system 6 into the refrigerant oil circulation path of the air conditioning refrigeration system 6.
[0025] Combination Figure 1 and Figure 2 As shown, the first end of the three-way valve 2 is connected to the gas inlet 11. A pressure gauge 3 is installed at the second end of the three-way valve 2 and is used to monitor the gas pressure inside the oil reservoir 1. A vacuum pump 4 and a refrigerant charging device 5 are respectively connected to the third end of the three-way valve 2.
[0026] Among them, such as Figure 1 As shown, when vacuum pump 4 is connected to the third end of three-way valve 2, vacuum pump 4 is used to extract air from oil reservoir 1. Figure 2 As shown, when the refrigerant charger 5 is connected to the third end of the three-way valve 2, the refrigerant charger 5 is used to charge refrigerant gas into the oil reservoir 1. The refrigerant can be one or more of tetrafluoroethane, Freon, trifluoromethane, or difluoroethane, or a mixture thereof.
[0027] When adding refrigerant oil to the air conditioning refrigeration system 6, firstly, refrigerant oil can be injected into the oil reservoir 1 through the oil inlet 12. Since the oil inlet 12 is located at the top of the oil reservoir 1, backflow of refrigerant oil can be avoided. Next, the vacuum pump 4 can be connected to the third end of the three-way valve 2 to extract air from the oil reservoir 1 until it is in a vacuum state, thus preventing residual air from remaining in the oil reservoir 1. Since the gas inlet 11 is located at the top of the oil reservoir 1, the refrigerant oil inside the oil reservoir 1 will not be sucked in during air extraction. Then, the refrigerant charging device 5 can be connected to the third end of the three-way valve 2. Refrigerant gas can be injected into the oil reservoir 1 through the refrigerant charging device 5. Since the density of refrigerant gas is less than that of refrigerant oil, the pressure of the refrigerant gas, combined with the gravity of the refrigerant oil itself, can force the refrigerant oil in the oil reservoir 1 into the air conditioning refrigeration system 6 through the oil outlet 13 located at the bottom of the oil reservoir 1. This completes the addition of refrigerant oil to the air conditioning refrigeration system 6.
[0028] As described above, refrigerant oil can be added to the oil reservoir 1 through the oil inlet 12. Due to gravity, the refrigerant oil in the oil reservoir 1 will not flow back out of the oil reservoir 1 through the gas outlet 11. Thus, the vacuum pump 4 can extract the air from the oil reservoir 1 through the gas outlet 11 by connecting to the third end of the three-way valve 2, and then charge the oil reservoir 1 with high-pressure refrigerant through the gas outlet 11 via the refrigerant charging device 5 connected to the third end of the three-way valve 2. Furthermore, the high-pressure refrigerant can be used to inject the refrigerant oil into the air conditioning refrigeration system 6 through the oil outlet 13 located at the bottom of the oil reservoir 1. Since the air in the oil reservoir 1 has been extracted and replaced with refrigerant with higher pressure, this is beneficial in two ways: firstly, it increases the speed at which the refrigerant oil in the oil reservoir 1 is forced into the air conditioning refrigeration system 6; secondly, it helps to prevent outside air from entering the air conditioning refrigeration system 6 and prevents refrigerant leakage.
[0029] In some examples, the refrigerant charger 5 is either a refrigerant bottle or the high-pressure discharge end of the compressor 61 of the air conditioning refrigeration system 6. The refrigerant bottle can be a container for storing liquid refrigerant; for example, it can be a can, barrel, or box-shaped container. Figure 2 As shown, after the refrigerant bottle is connected to the third end of the three-way valve 2, the refrigerant in the refrigerant bottle can vaporize into gas and enter the oil reservoir 1 through the gas inlet 11, compressing the refrigeration oil in the oil reservoir 1. This allows the refrigeration oil to be squeezed through the oil outlet 13 to the filler neck of the air conditioning refrigeration system 6. Combined with... Figure 3As shown, the refrigerant gas in the high-pressure discharge end of the compressor 61 of the air conditioning refrigeration system 6 has a high pressure. Therefore, since the high-pressure discharge end of the compressor 61 of the air conditioning refrigeration system 6 is connected to the third end of the three-way valve 2, the refrigerant gas in the high-pressure discharge end of the compressor 61 of the air conditioning refrigeration system 6 can enter the oil reservoir 1 through the gas inlet 11 and squeeze the refrigeration oil in the oil reservoir 1. This allows the refrigeration oil to be squeezed through the oil outlet 13 to the oil filler port of the air conditioning refrigeration system 6. In conjunction with... Figure 3 As shown, the oil filling port of the air conditioning refrigeration system 6 can be the low-pressure suction end 611 of the compressor 61 of the air conditioning refrigeration system 6. Since the pressure of the low-pressure suction end 611 of the compressor 61 is low, the refrigeration oil can be easily allowed to enter the refrigeration oil circulation pipeline of the air conditioning refrigeration system 6 through the low-pressure suction end 611 of the compressor 61.
[0030] In some examples, reference Figure 1 and Figure 2 As shown, the oil inlet 12 is equipped with an oil inlet valve 121, which controls the connection state of the oil inlet 12. The oil inlet valve 121 can be a ball valve, needle valve, or solenoid valve, etc. When it is necessary to add refrigerant oil to the oil reservoir 1, the oil inlet valve 121 can be opened, and the oil inlet 12 can be connected to a refrigerant tank, refrigerant pump, or refrigerant dispenser through a pipeline, thus allowing refrigerant oil to be added to the oil reservoir 1. After adding, the oil inlet valve 121 can be closed, facilitating the subsequent vacuum pump 4 to extract air from the oil reservoir 1 and the subsequent refrigerant charging device 5 to charge refrigerant gas into the oil reservoir 1. The refrigerant oil in the oil reservoir 1 can then be pumped into the refrigerant oil circulation pipeline of the air conditioning refrigeration system 6 through the oil outlet 13. Thus, the opening and closing of the oil inlet 12 can be conveniently achieved through the oil inlet valve 121.
[0031] In some examples, the oil outlet 13 is equipped with an oil outlet valve 131, which is used to control the connection state of the oil outlet 13. The oil outlet valve 131 can be a ball valve, needle valve, or solenoid valve, etc. When adding refrigerant oil from the oil reservoir 1 to the air conditioning refrigeration system 6, the oil outlet valve 131 can be opened. The refrigerant oil in the oil reservoir 1 can be forced through the oil outlet 13 by the refrigerant gas to the filler port of the compressor 61 of the air conditioning refrigeration system 6, thereby adding the refrigerant oil to the refrigerant oil circulation pipeline of the air conditioning refrigeration system 6. Thus, the opening and closing of the oil outlet 13 can be easily achieved through the oil outlet valve 131.
[0032] In this embodiment, refrigerant oil can be added to the oil reservoir 1 through the oil inlet 12. Due to gravity, the refrigerant oil in the oil reservoir 1 will not flow back out of the oil reservoir 1 through the gas outlet 11. Thus, the vacuum pump 4 can extract the air from the oil reservoir 1 through the gas outlet 11 by connecting to the third end of the three-way valve 2, and then charge the oil reservoir 1 with high-pressure refrigerant through the gas outlet 11 by the refrigerant charging device 5 connected to the third end of the three-way valve 2. Furthermore, the high-pressure refrigerant can be used to inject the refrigerant oil into the air conditioning refrigeration system 6 through the oil outlet 13 located at the bottom of the oil reservoir 1. Since the air in the oil reservoir 1 has been extracted and replaced with refrigerant with higher pressure, it is beneficial to increase the speed at which the refrigerant oil in the oil reservoir 1 is forced into the air conditioning refrigeration system 6, and also to prevent refrigerant leakage and the entry of outside air into the air conditioning refrigeration system 6, thus preventing refrigerant leakage.
[0033] Secondly, this embodiment also provides a method for adding refrigeration oil to an air conditioning refrigeration system, wherein the method uses any of the air conditioning refrigeration system refrigeration oil adding devices described in the first aspect.
[0034] In this embodiment of the disclosure, using any of the refrigerant oil charging devices for an air conditioning refrigeration system according to the first aspect, refrigerant oil can be added to the oil reservoir 1 through the oil inlet 12. Due to gravity, the refrigerant oil in the oil reservoir 1 will not flow back out of the oil reservoir 1 through the gas outlet 11. Thus, the vacuum pump 4 can extract the air from the oil reservoir 1 through the gas outlet 11 by connecting to the third end of the three-way valve 2, and then charge the oil reservoir 1 with high-pressure refrigerant through the gas outlet 11 by the refrigerant charging device 5 connected to the third end of the three-way valve 2. Furthermore, the refrigerant oil can be injected into the air conditioning refrigeration system 6 through the oil outlet 13 located at the bottom of the oil reservoir 1 using high-pressure refrigerant. Since the air in the oil reservoir 1 has been extracted and replaced with refrigerant with higher pressure, it is beneficial to increase the speed at which the refrigerant oil in the oil reservoir 1 is forced into the air conditioning refrigeration system 6, and also to prevent refrigerant leakage and the entry of outside air into the air conditioning refrigeration system 6, thus preventing refrigerant leakage.
[0035] In some examples, reference Figure 4 and Figure 5 As shown, the refueling method includes the following steps: Step 101 includes: opening the oil inlet 12 of the oil reservoir 1 of the air conditioning refrigeration system refrigerant oil filling device, and adding refrigerant oil into the oil reservoir 1 through the oil inlet 12.
[0036] For example, the oil inlet 12 can be connected to the fuel pump through a pipeline. Then, by opening the oil inlet valve 121, the oil reservoir 1 can be connected to the fuel pump through the oil inlet 12, and the fuel pump can then add refrigeration oil into the oil reservoir 1 through the oil inlet 12.
[0037] Step 102 includes: closing the oil inlet 12 and connecting the vacuum pump 4 of the air conditioning refrigeration system refrigerant oil filling device to the third end of the three-way valve 2 of the air conditioning refrigeration system refrigerant oil filling device.
[0038] For example, once the amount of refrigerant oil in the oil reservoir 1 reaches a certain level, the oil inlet valve 121 can be closed, preventing the oil reservoir 1 from connecting to the outside through the oil inlet 12. Next, the vacuum pump 4 is connected to the third end of the three-way valve 2 via a pipeline. Thus, with the gas inlet 11 open, starting the vacuum pump 4 can extract air from the oil reservoir 1 through the gas inlet 11, preventing air from entering the air conditioning refrigeration system 6 when the refrigerant gas compresses the refrigerant oil later, as air still exists in the oil reservoir 1.
[0039] Step 103 includes: opening the three-way valve 2 to connect the gas inlet 11, activating the vacuum pump 4 to extract air from the oil reservoir 1 until the pressure gauge 3 of the air conditioning refrigeration system's refrigerant oil charging device shows a negative pressure. When the pressure gauge 3 shows a negative pressure, it indicates that the air in the oil reservoir 1 has been extracted.
[0040] Step 104 includes: closing the three-way valve 2, disconnecting the vacuum pump 4 from the third end of the three-way valve 2, and then connecting the refrigerant charging device 5 of the air conditioning refrigeration system's refrigerant oil charging unit to the third end of the three-way valve 2. Closing the three-way valve 2 and then disconnecting the vacuum pump 4, and then connecting the refrigerant charging device 5 to the third end of the three-way valve 2, prevents air from entering the oil reservoir 1 through the three-way valve 2.
[0041] For example, after removing the vacuum pump 4, the high-pressure exhaust end of the refrigerant bottle or compressor 61 can be connected to the oil reservoir 1 via a pipeline through the gas inlet 11. Thus, with the gas inlet 11 connected, refrigerant gas, such as Freon gas, can be charged into the oil reservoir 1 through the refrigerant charging device 5.
[0042] Step 105 includes: opening the three-way valve 2 to connect the gas inlet 11, thereby allowing refrigerant gas to be introduced into the oil reservoir 1. The refrigerant gas entering the oil reservoir 1 can have a high pressure, so that when the oil outlet 13 is open, the refrigeration oil can be discharged from the oil reservoir 1 through the oil outlet 13.
[0043] Step 106 includes connecting the oil outlet 13 of the oil reservoir 1 to the refrigerant oil filler port of the air conditioning refrigeration system 6. In this way, the refrigerant oil discharged from the oil reservoir 1 through the oil outlet 13 can enter the refrigerant oil circulation pipeline of the air conditioning refrigeration system 6 via the refrigerant oil filler port. For example, the oil outlet 13 can be connected to the refrigerant oil filler port via a pipeline.
[0044] Step 107 includes: opening the oil outlet 13 and adding refrigerant oil into the air conditioning refrigeration system 6. For example, the oil outlet valve 131 can be opened to make the oil outlet 13 open, so that the refrigerant oil in the oil reservoir 1 can enter the refrigerant oil circulation pipeline of the air conditioning refrigeration system 6 through the oil outlet 13 and the refrigerant oil filler port.
[0045] Step 108 includes: closing the oil outlet 13 after the refrigerant oil filling is completed. This prevents refrigerant oil from leaking out of the oil outlet 13 when there is still refrigerant oil remaining in the oil reservoir 1. For example, the oil outlet valve 131 can be closed.
[0046] In some examples, since there is no interference between the connection between the oil outlet 13 and the refrigeration oil filler port and other operations in the filling method, step 106 can also be located before any of steps 101 to 105.
[0047] In some examples, reference Figure 2 and Figure 4 As shown, when the refrigerant charging device 5 is a refrigerant bottle, the air conditioning refrigeration system 6 is in a stopped state, allowing for the charging of refrigerant oil to the air conditioning refrigeration system 6 while it is stopped. After charging refrigerant gas into the oil receiver 1 until the pressure inside the oil receiver 1 reaches the specified pressure, and the oil outlet 13 is connected to the refrigerant oil filler port of the air conditioning refrigeration system 6, first close the three-way valve 2, then open the oil outlet 13. Once the pressure inside the oil receiver 1 reaches the specified pressure, close the three-way valve 2 to prevent refrigerant from continuously entering the oil receiver 1 from the refrigerant bottle. This avoids wasting refrigerant.
[0048] Furthermore, after the refrigerant oil is added, the gas inlet 11, oil inlet 12, and oil outlet 13 of the oil reservoir 1 can all be closed, and the oil reservoir 1 can be in a sealed state. In this way, the remaining refrigerant oil and refrigerant gas in the oil reservoir 1 can be prevented from leaking and can be used for the next addition.
[0049] In some examples, the specified pressure can be the saturation pressure of the refrigerant at the ambient temperature. This allows for maximizing the rate at which the refrigeration oil is added.
[0050] In some examples, when the pressure inside the reservoir 1 reaches a specified pressure, the reading on pressure gauge 3 is between 5 kgf / cm² and 8 kgf / cm². For example, the reading on pressure gauge 3 could be 5 kgf / cm², 5.8 kgf / cm², 6.2 kgf / cm², 7.3 kgf / cm², or 8 kgf / cm², etc.
[0051] In this way, on the one hand, it can prevent the refrigerant gas pressure in the oil receiver 1 from being too high, which would cause the refrigeration oil to be added too quickly and easily impact the internal oil passages of the compressor 61, causing damage to the internal oil passages of the compressor 61. On the other hand, it can prevent the refrigerant gas pressure in the oil receiver 1 from being too low, which would reduce the refrigeration oil adding speed.
[0052] In some examples, when the oil inlet 12 is closed, the refrigerant oil in the oil reservoir 1 occupies 3 / 5 to 4 / 5 of the maximum volume of the oil reservoir 1. For example, the oil inlet 12 can be closed after the refrigerant oil has been added to 3 / 5 to 4 / 5 of the maximum volume of the oil reservoir 1 by the oil pump.
[0053] When the oil inlet 12 is closed, the refrigerant oil in the oil reservoir 1 occupies 3 / 5, 7 / 10, 15 / 20, or 4 / 5 of its maximum volume. The maximum volume of the oil reservoir 1 can be between 18L and 25L. For example, the maximum volume of the oil reservoir 1 can be 18L, 19L, 20L, 21L, 22L, 23L, 24L, or 25L.
[0054] This approach serves two purposes: firstly, it avoids insufficient refrigerant oil, which would necessitate multiple refills and reduce efficiency; secondly, it prevents excessive refrigerant oil, which would result in insufficient refrigerant gas being introduced, causing a rapid pressure drop and slow refrigerant oil addition. With more refrigerant gas, the pressure drops more slowly, maintaining a sufficient refrigerant oil addition rate.
[0055] Furthermore, when the pressure gauge 3 reading is between 5 kgf / cm² and 8 kgf / cm², even if all the refrigerant oil in the oil reservoir 1 has been emptied, the pressure of the remaining refrigerant gas can still be greater than atmospheric pressure. Therefore, even if there is a minor leak in the oil reservoir 1 during storage, air will not leak into it. Thus, when the air conditioning refrigeration system refrigerant oil charging device is needed again, it is not necessary to use the vacuum pump 4 to remove air from the oil reservoir 1, and air can be prevented from entering the refrigerant oil circulation lines of the air conditioning refrigeration system 6.
[0056] Preferably, when the oil inlet 12 is closed, the refrigeration oil in the oil reservoir 1 occupies 2 / 3 of the maximum volume of the oil reservoir 1.
[0057] In some examples, reference Figure 3 and Figure 5As shown, when the refrigerant charger 5 is at the high-pressure discharge end of the compressor 61 of the air conditioning refrigeration system 6, the air conditioning refrigeration system 6 is in operation, allowing for the charging of refrigerant oil while the system is running. The refrigerant oil filler port of the air conditioning refrigeration system 6 is at the low-pressure suction end 611 of the compressor 61. Thus, during the refrigerant oil charging process, it is not necessary to close the gas inlet 11. The pressure difference between the high-pressure discharge end and the low-pressure suction end 611 provides a stable and continuous pressure output for the refrigerant oil in the oil reservoir 1, allowing the refrigerant oil to smoothly and quickly enter the refrigerant oil circulation pipeline through the oil outlet 13. After the refrigerant oil charging is completed, the gas inlet 11 can be closed.
[0058] In some examples, since the pressure difference between the refrigerant gas in the oil reservoir 1 and the refrigerant oil filler port of the air conditioning refrigeration system 6 is the same as the pressure difference between the high-pressure discharge end and the low-pressure suction end 611 when the air conditioning refrigeration system 6 is running, the pressure difference will not change significantly. Therefore, before opening the oil outlet 13, it is not necessary to leave too much space in the oil reservoir 1 to accommodate the refrigerant gas. Thus, when the refrigerant charger 5 is the high-pressure discharge end of the compressor 61 of the air conditioning refrigeration system 6, when the oil inlet 12 is closed, the refrigerant oil in the oil reservoir 1 occupies 95% to 100% of the maximum volume of the oil reservoir 1. In this way, as much refrigerant oil as possible can be added to the oil reservoir 1, thereby reducing the frequency of operation and increasing the filling speed.
[0059] Preferably, when the oil inlet 12 is closed, the refrigeration oil in the oil reservoir 1 occupies 100% of the maximum volume of the oil reservoir 1.
[0060] In some examples, the third end of the three-way valve 2 can be connected to the refrigerant charger 5 via a threaded connection. When connecting the third end of the three-way valve 2 to the refrigerant charger 5, with the three-way valve 2 in the closed state, the refrigerant charger 5 can be lightly screwed onto the third end of the three-way valve 2. Then, the refrigerant charger 5 can be opened until refrigerant gas flows out from the connection between the three-way valve 2 and the corresponding pipe. Immediately close the refrigerant charger 5, then tighten the three-way valve 2 to the corresponding pipe. Afterward, both the refrigerant charger 5 and the three-way valve 2 can be opened to charge refrigerant gas into the oil reservoir 1. This allows air in the refrigerant charger 5's pipe to be expelled, preventing air from entering the oil reservoir 1 via the three-way valve 2.
[0061] In some examples, the inlet 12 and the fuel dispenser's piping can be connected by threads. When connecting the inlet 12 to the corresponding piping, the inlet valve 121 is in the closed state. First, lightly screw the corresponding piping onto the inlet 12, then open the fuel dispenser until refrigerant oil flows out from the connection between the inlet 12 and the corresponding piping. Immediately close the fuel dispenser, then tighten the inlet 12 and the corresponding piping. Afterward, open both the fuel dispenser and the inlet valve 121 to add refrigerant oil to the reservoir 1. This allows air to be expelled from the fuel dispenser's piping, preventing air from entering the reservoir 1 through the inlet 12.
[0062] In some examples, the pipe at the oil outlet 13 can be connected to the filler neck of the air conditioning refrigeration system 6 via a threaded connection. When connecting the filler neck to the corresponding pipe, with the filler neck closed, first lightly screw the corresponding pipe onto the filler neck, then open the oil outlet valve 131 until refrigerant oil flows out from the connection between the filler neck and the corresponding pipe. Immediately close the oil outlet valve 131, then tighten the oil outlet 13 to the corresponding pipe. Afterward, open both the filler neck and the oil outlet valve 131 to add refrigerant oil to the refrigerant oil circulation pipe of the air conditioning refrigeration system 6. This allows air to be expelled from the pipe at the oil outlet 13, preventing air from entering the air conditioning refrigeration system 6 through the filler neck.
[0063] In some examples, when disconnecting the pipelines corresponding to three-way valve 2, oil inlet 12, and oil outlet 13, the connections between the pipelines can be slightly loosened first to allow gas to slowly flow out, thereby reducing the pressure within the pipelines. Continue until the gas stops flowing out, indicating that the pressure within the pipelines has decreased to atmospheric pressure. At this point, the pipelines can be directly disconnected. This ensures safe disconnection of the pipelines.
[0064] In some examples, after adding refrigerant oil to the air conditioning system 6, the oil outlet 13 can be closed first, followed by the oil filler port of the air conditioning system 6. This helps to avoid wasting refrigerant oil.
[0065] In this embodiment of the disclosure, the refrigerant oil charging device for the air conditioning refrigeration system of the first aspect can realize the charging of refrigerant oil for the air conditioning refrigeration system 6 in both the running and shutdown states by switching the type of refrigerant charger 5, thereby adapting to the different operating conditions required.
[0066] It should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0068] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this application.
[0069] The above are merely embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.
Claims
1. A refrigerant oil charging device for an air conditioning refrigeration system, characterized in that, The air conditioning refrigeration system refrigerant oil charging device includes an oil reservoir (1), a three-way valve (2), a pressure gauge (3), a vacuum pump (4), and a refrigerant charger (5). The oil reservoir (1) has a gas inlet (11), an oil inlet (12) and an oil outlet (13). The gas inlet (11) and the oil inlet (12) are located at the top of the oil reservoir (1), and the oil outlet (13) is located at the bottom of the oil reservoir (1). The first end of the three-way valve (2) is connected to the gas inlet (11); The pressure gauge (3) is installed at the second end of the three-way valve (2), and the pressure gauge (3) is used to monitor the air pressure in the oil reservoir (1); The vacuum pump (4) and the refrigerant charging device (5) are respectively connected to the third end of the three-way valve (2). When the vacuum pump (4) is connected to the third end of the three-way valve (2), the vacuum pump (4) is used to extract the air in the oil reservoir (1). When the refrigerant charging device (5) is connected to the third end of the three-way valve (2), the refrigerant charging device (5) is used to charge the refrigerant gas into the oil reservoir (1).
2. The air conditioning refrigeration system refrigerant oil charging device according to claim 1, characterized in that, The refrigerant charger (5) is the high-pressure exhaust end of the compressor (61) of the refrigerant bottle or the air conditioning refrigeration system (6).
3. The air conditioning refrigeration system refrigerant oil charging device according to claim 1, characterized in that, The oil inlet (12) is provided with an oil inlet valve (121), which is used to control the connection state of the oil inlet (12).
4. The air conditioning refrigeration system refrigerant oil charging device according to claim 1, characterized in that, The oil outlet (13) is equipped with an oil outlet valve (131), which is used to control the connection state of the oil outlet (13).
5. A method for adding refrigeration oil to an air conditioning refrigeration system, characterized in that, The filling method uses the air conditioning refrigeration system refrigeration oil filling device according to any one of claims 1 to 4.
6. The filling method according to claim 5, characterized in that, The refueling method includes the following steps: Open the oil inlet (12) of the oil reservoir (1) of the air conditioning refrigeration system refrigeration oil filling device, and add refrigeration oil into the oil reservoir (1) through the oil inlet (12); Close the oil inlet (12) and connect the vacuum pump (4) of the air conditioning refrigeration system refrigeration oil filling device to the third end of the three-way valve (2) of the air conditioning refrigeration system refrigeration oil filling device; Open the three-way valve (2) and start the vacuum pump (4) to extract the air from the oil reservoir (1) until the pressure gauge (3) of the air conditioning refrigeration system refrigerant oil filling device shows a negative pressure; After closing the three-way valve (2) and separating the vacuum pump (4) from the third end of the three-way valve (2), connect the refrigerant charger (5) of the air conditioning refrigeration system refrigeration oil charging device to the third end of the three-way valve (2); Open the three-way valve (2) and charge the oil reservoir (1) with refrigerant gas; Connect the oil outlet (13) of the oil reservoir (1) to the refrigerant oil filling port of the air conditioning refrigeration system (6); Open the oil outlet (13) and add refrigeration oil into the air conditioning refrigeration system (6); After the refrigeration oil is added, close the oil outlet (13).
7. The filling method according to claim 6, characterized in that, When the refrigerant charger (5) is a refrigerant bottle, the air conditioning refrigeration system (6) is in a shutdown state; After filling the oil reservoir (1) with refrigerant gas until the pressure inside the oil reservoir (1) reaches the specified pressure and the oil outlet (13) is connected to the refrigeration oil filling port of the air conditioning refrigeration system (6), first close the three-way valve (2) and then open the oil outlet (13). Preferably, when the pressure inside the oil reservoir (1) reaches the specified pressure, the reading of the pressure gauge (3) is between 5 kgf / cm² and 8 kgf / cm².
8. The filling method according to claim 7, characterized in that, When the oil inlet (12) is closed, the refrigeration oil in the oil reservoir (1) occupies 3 / 5 to 4 / 5 of the maximum volume of the oil reservoir (1); Preferably, when the oil inlet (12) is closed, the refrigeration oil in the oil reservoir (1) occupies 2 / 3 of the maximum volume of the oil reservoir (1).
9. The filling method according to claim 6, characterized in that, When the refrigerant charger (5) is the high-pressure exhaust end of the compressor (61) of the air conditioning refrigeration system (6), the air conditioning refrigeration system (6) is in operation, and the refrigerant oil filler port of the air conditioning refrigeration system (6) is the low-pressure suction end (611) of the compressor (61).
10. The filling method according to claim 9, characterized in that, When the oil inlet (12) is closed, the refrigeration oil in the oil reservoir (1) occupies 95% to 100% of the maximum volume of the oil reservoir (1); Preferably, when the oil inlet (12) is closed, the refrigeration oil in the oil reservoir (1) occupies 100% of the maximum volume of the oil reservoir (1).