Refrigerating machine oil filling device of air conditioner compressor and connecting structure of refrigerating machine oil filling device and air conditioner

Abstract

The utility model relates to a refrigerating machine oil filling device of an air conditioner compressor and a connecting structure of the refrigerating machine oil filling device of the air conditioner compressor and an air conditioner in specific application. The refrigerating machine oil filling device of the air conditioner compressor comprises a first connecting pipe and a refrigerating machine oil temporary storage container, the refrigerating machine oil temporary storage container is a closed container with an openable and closable feeding port, and one end of the first connecting pipe is communicated with the refrigerating machine oil temporary storage container. The end, away from the refrigerator oil temporary storage container, of the first connecting pipe is connected with a pressure release valve which is provided with a pressure release valve first connector connected with the first connecting pipe and a pressure release valve second connector connected with an access hole in an air conditioner low-pressure valve in the air conditioner connecting pipe. A first ejector pin capable of moving in a reciprocating mode in the axial direction of the pressure release valve cavity is arranged in the pressure release valve second connector in a matched mode, and opening and closing control over the pressure release valve and the air conditioner low-pressure valve can be achieved at the same time by controlling movement of the first ejector pin. The on-line filling device can conveniently realize on-line filling of refrigerating machine oil into the whole air conditioner.

Description

Technical Field

[0001] The utility model relates to an air-conditioning compressor refrigeration oil filling device and a connection structure of the air-conditioning compressor refrigeration oil filling device and an air conditioner in specific application, belonging to the technical field of air-conditioner repair devices. Background Art

[0002] In the field of air conditioning and refrigeration, whether it is a household air conditioner or a central air conditioner, the compressors used, whether they are rotary rotor compressors, turbine compressors, or piston compressors, all have mechanical movement and are subject to ultra-low temperature startup and high-temperature operation. Lubricating oil is required for high-speed mechanical movement. The air conditioning compressor is lubricated by a special compressor refrigeration oil. Refrigeration oil mainly plays the following four roles in the compressor:

[0003] 1. Lubrication: reduce the friction and wear of the compressor and extend the service life of the compressor;

[0004] 2. Sealing function: to achieve sealing between the piston and cylinder surface in the compressor and between the rotating bearings to prevent refrigerant leakage;

[0005] 3. Energy regulation: For refrigeration compressors with energy regulation mechanisms, the oil pressure of the refrigeration oil can be used as the power of the energy regulation mechanism;

[0006] 4. Cooling effect: The refrigeration oil circulates in the oil circuit, taking away the heat from the friction surface and cooling the moving parts. If the air conditioner compressor lacks refrigeration oil or the refrigeration oil is insufficient during operation, it often causes the following problems:

[0007] 1. Increased noise: When the compressor in the refrigeration equipment is short of oil, the lack of lubricating oil will increase friction, causing an increase in noise. This noise is usually continuous and sharp, in stark contrast to the low noise during normal operation. Therefore, when we hear a noticeable increase in noise when using the refrigeration equipment, we need to consider whether the compressor is short of oil;

[0008] 2. Unstable operation: The compressor in the refrigeration equipment should maintain a stable operating state during normal operation. However, when the compressor lacks oil, its operating state is prone to instability. Specifically, the cooling effect of the refrigeration equipment is reduced and the temperature is difficult to control stably. In addition, due to the lack of lubricating oil protection in the compressor, it is prone to abnormal phenomena such as shaking and vibration during operation.

[0009] 3. Energy efficiency decline: The energy efficiency of refrigeration equipment is an important indicator for evaluating its performance. The lack of oil in the compressor will directly lead to a decline in energy efficiency. Because of the lack of lubricating oil protection, increased friction will cause an increase in energy loss, thus reducing the refrigeration effect and energy efficiency of the equipment. In the long run, it will not only increase energy consumption, but also exacerbate equipment wear and shorten its service life;

[0010] 4. Excessive temperature: The compressor in the refrigeration equipment is responsible for compressing the refrigerant. When lacking oil, the internal temperature of the compressor is likely to be too high. High temperature will cause the oxidation and decomposition of lubricating oil, accelerate equipment wear, and may trigger failures. In addition, excessive temperature will also have an adverse impact on other components of the equipment, such as causing the expansion and deformation of the condenser and evaporator pipelines, and frosting of the condenser.

[0011] From the above analysis, it can be seen that the lack of oil in the compressor of refrigeration equipment will cause a series of serious symptoms, such as increased noise, unstable operation, decline in energy efficiency, and excessive temperature. Therefore, in order to ensure the normal operation of refrigeration equipment and extend its service life, we should always pay attention to the lubricating oil condition of the compressor during use, regularly check and add lubricating oil in a timely manner. Only by maintaining a good lubrication state of the compressor can we give full play to the performance of refrigeration equipment and provide a more comfortable environment for our lives.

[0012] The refrigeration oil of the compressor is usually filled according to the displacement and volume standards at the compressor manufacturer. Then, under what circumstances will there be a shortage or reduction of the compressor refrigeration oil? According to experience summary, the compressor will be short of oil or the refrigeration oil will be insufficient in the following scenarios:

[0013] 1. Refrigeration system leaks fluorine, especially in the case of explosive leakage of the refrigeration system. The refrigeration oil will leak out and be lost along with the refrigerant;

[0014] 2. One outdoor unit serving multiple plate heat exchangers. For some special engineering plate heat exchanger equipment, one outdoor unit serves many plate heat exchanger equipment, resulting in the dispersion of refrigeration oil into each plate heat exchanger. The refrigeration oil cannot circulate and flow back to the compressor well, causing a shortage or lack of refrigeration oil in the compressor. Similarly, for multi-connected duct air conditioners and other central air conditioners with multiple indoor units and many pipeline branches, there will also be a similar situation where it is difficult for the refrigeration oil to return, resulting in a shortage or insufficiency of the compressor oil;

[0015] 3. When installing the air conditioner at the user end, the connecting pipe is welded and lengthened, and the pipe length exceeds the length limit specified by the air conditioner manufacturer; or the installation environment on site determines that the outdoor unit needs to be installed higher than the indoor unit, and the height difference exceeds the height specified by the manufacturer. In this way, the refrigeration oil of the compressor will also have difficulty flowing back, resulting in insufficient refrigeration oil and poor lubrication effect.

[0016] The refrigeration oil of the compressor is the theoretical oil injection carried out by the compressor manufacturer according to the displacement and volume of the compressor. It is inevitable that the refrigeration oil is missing or insufficient due to the abnormal state at the market end mentioned above. Therefore, there is no good solution to the lack or insufficiency of the refrigeration oil in the compressor in the above scenario, and the result will ultimately lead to a reduction in the performance of the compressor, abnormal noise, and even damage to the compressor.

[0017] By searching the industry, there are similar technologies in the replenishment and filling of the refrigeration oil of the compressor. The Chinese utility model patent document with the publication number CN221196958U discloses a compressor oil injection system, including a vacuum pumping device, a refrigeration oil storage tank, a three-way joint, a first stop valve, and a second stop valve; the air extraction port of the vacuum pumping device is connected to the first end of the first stop valve, and the second end of the first stop valve is connected to the first end of the three-way joint; the second end of the three-way joint is connected to the first end of the second stop valve, and the second end of the second stop valve is connected to the refrigeration oil storage tank; wherein, the refrigeration oil storage tank is filled with the refrigeration oil to be filled; the third end of the three-way joint is connected to the oil injection port of the compressor to be oil-injected; by adjusting the opening and closing of the two stop valves, the refrigeration oil pre-filled in the refrigeration oil storage tank is injected into the compressor to be oil-injected. However, there are still some deficiencies:

[0018] 1. When filling the refrigeration oil of the compressor, it can only fill the refrigeration oil for the compressor alone, and there is still a blank in the technology of filling the refrigeration oil of the compressor for the whole air conditioner at the user end.

[0019] 2. There is no pressure gauge designed in the oil injection and filling device, so it is impossible to determine whether the refrigeration oil enters the air conditioner compressor, nor can the filling process be observed. The filling process can only be subjectively judged. If the system is blocked and the pressure is higher than the pressure of the external storage tank, the oil cannot be injected. Utility Model Content

[0020] The technical problem to be solved by the present utility model is to provide an air conditioner compressor refrigeration oil filling device that can conveniently realize the on-line filling of refrigeration oil for the whole air conditioner.

[0021] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: An air-conditioning compressor refrigerant oil filling device, which includes a first connecting pipe and a refrigerant oil temporary storage container. The refrigerant oil temporary storage container is a closed container with an openable and closable feed port. One end of the first connecting pipe is communicated with the refrigerant oil temporary storage container. The end of the first connecting pipe far away from the refrigerant oil temporary storage container is connected with a pressure relief valve. The pressure relief valve includes a pressure relief valve cavity, a first pressure relief valve interface and a second pressure relief valve interface that are respectively communicated with the pressure relief valve cavity. The first pressure relief valve interface is correspondingly connected with the first connecting pipe, and there is an openable and closable oil discharge structure at the connection. A first thimble that can reciprocate axially along the pressure relief valve cavity is arranged in the second pressure relief valve interface. The first thimble is equipped with a switch knob. When the switch knob rotates along the first direction, it can drive the first thimble to move outwards so that the second pressure relief valve interface is in an open state. When the switch knob rotates along the second direction, the first thimble retracts so that the second pressure relief valve interface is in a closed state. The second pressure relief valve interface has a connection port that matches the inspection port on the air-conditioning low-pressure valve in the air-conditioning connection pipe.

[0022] Further preferably: The openable and closable feed port of the refrigerant oil temporary storage container includes a second connecting pipe and a first stop valve arranged on the second connecting pipe.

[0023] Further preferably: The end of the second connecting pipe far away from the refrigerant oil temporary storage container is connected with a syringe in a matching manner, and the injection needle of the syringe is inserted into the second connecting pipe in a clearance fit manner.

[0024] Further preferably: A pressure gauge for detecting the fluid pressure in the pipeline is arranged on the first connecting pipe.

[0025] Further preferably: The pressure gauge is arranged on the first connecting pipe through a three-way pipe joint.

[0026] Further preferably: The end of the first connecting pipe is docked with the first pressure relief valve interface through a connector.

[0027] The above-mentioned refrigerant oil filling device for air-conditioning compressors can be directly applied and implemented on the whole air conditioner. Correspondingly, the present invention also provides a connection structure between the above-mentioned refrigerant oil filling device for air-conditioning compressors and the air conditioner. The air conditioner can be implemented with reference to the prior art and includes an air-conditioning indoor unit and an air-conditioning outdoor unit. A thin refrigerant pipe and a thick refrigerant pipe are provided between the air-conditioning indoor unit and the air-conditioning outdoor unit. The thin refrigerant pipe is correspondingly connected to the evaporator inlet of the air-conditioning indoor unit, and the thick refrigerant pipe is correspondingly connected to the evaporator outlet of the air-conditioning indoor unit. An air-conditioning high-pressure valve is connected to the thin refrigerant pipe, and an air-conditioning low-pressure valve is provided on the thick refrigerant pipe. An inspection port is provided on the air-conditioning low-pressure valve. The opening and closing of the internal flow path of the inspection port is controlled by a second thimble that reciprocates axially along it. The second thimble is provided with a second spring. During application and implementation, the second interface of the pressure relief valve in the present invention is fixedly docked with the inspection port on the air-conditioning low-pressure valve through a detachable connection structure. When the switch knob rotates in the first direction to drive the first thimble to move outwards, the first thimble can drive the second thimble to retract into the inspection port, so that the second interface of the pressure relief valve and the inspection port on the air-conditioning low-pressure valve are both in an open state and communicate with each other. When the first thimble retracts into the second interface of the pressure relief valve to make the second interface of the pressure relief valve in a closed state, the second thimble extends out of the inspection port under the action of the reset spring force of the second spring to make the inspection port in a closed state.

[0028] The specific operation method of the present invention includes the following steps:

[0029] S100: The pressure relief valve is initially in a closed state, and the pressure relief valve is connected to the inspection port on the air-conditioning low-pressure valve;

[0030] S110: Exclude the air inside the filling device. Add refrigerant oil to the refrigerant oil temporary storage container, and make the refrigerant oil flow through the first connecting pipe. The oil discharge structure at the connection between the first connecting pipe and the pressure relief valve is initially in an open state. When refrigerant oil overflows at the oil discharge structure, the air inside the filling device is excluded. Then, make the oil discharge structure in a closed state;

[0031] S120: Perform the filling of the compressor's refrigeration oil. Inject all the refrigeration oil to be filled quantitatively into the temporary storage container for refrigeration oil, and keep the inlet of the temporary storage container for refrigeration oil in a closed state. Open the pressure relief valve, which is connected to the low-pressure valve of the air conditioner. When the air conditioner is in the cooling mode, a certain degree of negative pressure will be generated during the suction of the low-pressure side of the compressor, and the refrigeration oil in the temporary storage container for refrigeration oil will be sucked into the compressor. To facilitate the intuitive observation of the refrigeration oil filling process, a pressure gauge is designed on the first connecting pipe of the present utility model. The pressure parameter of the refrigeration oil in the pipeline can be observed from the pressure gauge. When the pointer of the pressure gauge drops to 0 or a negative number, it proves that all the refrigeration oil in the temporary storage container for refrigeration oil has entered the air-conditioning system, and the refrigeration oil filling process is completed. If the filling of the compressor's refrigeration oil is too slow during the filling process, the high-pressure valve of the air conditioner can also be briefly closed. When the high-pressure valve of the air conditioner is closed, the exhaust of the compressor is blocked, which will increase the suction volume. The rapid suction will generate a greater negative pressure, and the refrigeration oil in the temporary storage container for refrigeration oil will be sucked into the compressor faster. Then, open the high-pressure valve of the air conditioner in time to complete the filling of the refrigeration oil. If the amount of refrigeration oil filled at one time is insufficient, the above steps can be repeated to continue the filling. After the filling process of the refrigeration oil is completed, the next step of the filling device disassembly process S130 can be carried out;

[0032] S130: Disassembly of the filling device. First, confirm that the pressure relief valve is in a closed state (i.e., the maintenance port of the low-pressure valve of the air conditioner returns to the closed state), and then remove the pressure relief valve to complete the disassembly and detachment of the filling device.

[0033] The beneficial effects of the present utility model are as follows: The present utility model is mainly aimed at after-sales maintenance. When the refrigeration oil of the air conditioner compressor at the user end is missing or insufficient due to various reasons such as lack of refrigerant leakage, excessive lengthening of the pipeline, excessive height difference of the outdoor unit, multi-connected plate heat exchanger equipment, and multi-connected air duct unit, the online filling of the refrigeration oil of the air conditioner compressor can be realized. The manufacturing process of this filling device is simple and the materials are common. Using the filling device and filling method provided by the present utility model, the refrigeration oil can be filled quantitatively and no air will enter. Moreover, the filling process of the refrigeration oil can be visually observed through the pressure gauge, and its convenience and practicability are strong. The present utility model can avoid the damage of the compressor due to lack of oil, and can also avoid the cumbersome processes of directly disassembling the compressor for replacement or disassembling and returning to the factory for oil refilling due to lack of oil. It also avoids the situation that the user cannot use the air conditioner due to long-term maintenance, greatly improving the maintenance efficiency and reducing the maintenance cost. The present utility model makes the filling of the refrigeration oil of the whole air conditioner compressor convenient, fast and efficient, effectively guarantees the quality and reliability of the air conditioner compressor, and has advanced technology and strong promotion value. Description of the Drawings

[0034] Figure 1It is a schematic structural diagram of a refrigerant oil filling device for an air-conditioning compressor in the present utility model.

[0035] Figure 2 It is a schematic overall structural diagram when the present utility model is applied and implemented.

[0036] Figure 3 It is a schematic structural diagram of a low-pressure valve of an air conditioner in the present utility model.

[0037] Figure 4 It is a schematic structural diagram when the pressure relief valve in the present utility model is in an open state (the first ejector pin extends outwards).

[0038] Figure 5 It is a schematic structural diagram when the pressure relief valve in the present utility model is in a closed state (the first ejector pin retracts inwards).

[0039] Component markings in the figure: indoor unit of the air conditioner 100, outdoor unit of the air conditioner 101, thin refrigerant pipe 102, thick refrigerant pipe 103, high-pressure valve of the air conditioner 104, low-pressure valve of the air conditioner 105, pressure relief valve 106, first connecting pipe 107, three-way pipe joint 108, pressure gauge 109, temporary storage container for refrigerant oil 110, first stop valve 111, second connecting pipe 112, syringe 113, connector 114, first ejector pin 115, switch knob 116, second ejector pin 117. Detailed implementation manners

[0040] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] As Figures 1 to 5 shown, the present utility model includes a first connecting pipe 107 and a temporary storage container for refrigerant oil 110. The temporary storage container for refrigerant oil 110 is a closed container with an openable and closable feed port. One end of the first connecting pipe 107 is connected to the temporary storage container for refrigerant oil 110. The end of the first connecting pipe 107 far from the temporary storage container for refrigerant oil 110 is connected with a pressure relief valve 106. The pressure relief valve 106 includes a pressure relief valve cavity and a pressure relief valve first interface and a pressure relief valve second interface respectively connected to the pressure relief valve cavity. The pressure relief valve first interface is correspondingly connected to the first connecting pipe 107. A first ejector pin 115 that can reciprocate axially along the pressure relief valve cavity is arranged in the pressure relief valve second interface. The first ejector pin 115 is provided with a switch knob 116. When the switch knob 116 rotates along the first direction, it can drive the first ejector pin 115 to move outwards so that the pressure relief valve second interface is in an open state. When the switch knob 116 rotates along the second direction, the first ejector pin 115 retracts inwards so that the pressure relief valve second interface is in a closed state. The pressure relief valve second interface has a connection port that matches the inspection port on the low-pressure valve 105 of the air-conditioning connection pipe. It can be understood that if the first direction is the clockwise direction, the second direction is the counterclockwise direction; if the first direction is the counterclockwise direction, the second direction is the clockwise direction.

[0042] Specifically, the first connecting pipe 107 therein is used for connecting the syringe and the stop valve 111, usually a copper pipe for air conditioners; the refrigerant oil storage container 110 is used for temporarily storing refrigerant oil, and can usually be replaced by a commonly used silencer for air conditioners, which is convenient for welding; the pressure relief valve 106 is a complete set of products in the prior art and can be directly purchased on the market. Its essence is a pressure relief valve or a safety valve with a manual switch function; one end of the pressure relief valve 106 is connected to the first connecting pipe 107, and the other end is connected to the inspection port on the low-pressure valve 105 of the air conditioner. The reciprocating movement of the first thimble 115 when the pressure relief valve 106 is switched is used to control the second thimble 117 at the inspection port, thereby realizing the on-off control of the inspection port and achieving the filling of the compressor refrigerant oil. The switch knob 116 can usually be directly connected to the valve body of the pressure relief valve 106 in the form of a threaded rod, and the end of the threaded rod directly drives the first thimble 115 to lift. Of course, in other alternative embodiments, other linear displacement mechanisms can also be used to drive the first thimble 115 to move.

[0043] In order to facilitate the quantitative addition of refrigerant oil into the refrigerant oil storage container 110, the openable and closable feed port of the refrigerant oil storage container 110 includes a second connecting pipe 112 and a first stop valve 111 provided on the second connecting pipe 112. By controlling the opening and closing of the first stop valve 111, the opening and closing control of the feed port of the refrigerant oil storage container 110 is realized. It can be understood that in some alternative solutions, the openable and closable function of the feed port can also be realized by an openable and closable sealing cover. In the preferred embodiment of the present invention, the second connecting pipe 112 is used for connecting the syringe 113 and the first stop valve 111, usually a copper pipe for air conditioners, and the first stop valve 111 can generally be replaced by a commonly used small stop valve for air conditioners.

[0044] One end of the second connecting pipe 112 away from the refrigerant oil storage container 110 is used to be connected to various refrigerant oil quantitative filling devices in a matching manner. To make the structure simple and reliable, the present invention uses a syringe 113. Specifically, when connecting, the injection needle of the syringe 113 is inserted into the second connecting pipe 112 with a clearance fit. The body of the syringe 113 is provided with scales, and the syringe 113 is used for the quantitative filling of refrigerant oil.

[0045] To facilitate the monitoring of the refrigerant oil pressure and thus visually observe the refrigerant oil filling process, a pressure gauge 109 for detecting the fluid pressure in the pipeline is provided on the first connecting pipe 107. For the convenience of assembly, the pressure gauge 109 is arranged on the first connecting pipe 107 through a three-way pipe joint 108. The three-way pipe joint 108 is usually a copper three-way for air conditioners, which is convenient for welding.

[0046] The pressure relief valve 106 is a standardized product. To facilitate the quick connection between the pressure relief valve 106 and the first connecting pipe 107 and to achieve the air discharge function during the operation process, the end of the first connecting pipe 107 is docked with the first interface of the pressure relief valve through a connector 114. It can be understood that the connector 114 can be various pipe docking joints in the prior art.

[0047] When this utility model is specifically applied, it is used in conjunction with the whole air conditioner. The air conditioner is prior art, refer to Figure 2 , the air conditioner includes an air conditioner indoor unit 100 and an air conditioner outdoor unit 101. A thin refrigerant pipe 102 and a thick refrigerant pipe 103 are arranged between the air conditioner indoor unit 100 and the air conditioner outdoor unit 101. The thin refrigerant pipe 102 is correspondingly connected to the evaporator inlet of the air conditioner indoor unit 100, and the thick refrigerant pipe 103 is correspondingly connected to the evaporator outlet of the air conditioner indoor unit 100. An air conditioner high-pressure valve 104 is connected to the thin refrigerant pipe 102, and an air conditioner low-pressure valve 105 is arranged on the thick refrigerant pipe 103. An inspection port is arranged on the air conditioner low-pressure valve 105, and the opening and closing of the internal flow passage thereof are controlled by a second thimble 117 that reciprocates axially along it. The second thimble 117 is provided with a second spring, and the restoring elastic force of the second spring enables the second thimble 117 to maintain the inspection port in a closed state. When the second thimble 117 is retracted into the inspection port under an external force, the inspection port can be connected to the inner cavity of the air conditioner low-pressure valve 105. Specifically, the air conditioner low-pressure valve 105 can also be called the "large stop valve". When the air conditioner is in the cooling mode, the refrigerant flows back to the outdoor unit compressor through this valve. The air conditioner high-pressure valve 104 can also be called the "small stop valve". When the air conditioner is in the cooling mode, the refrigerant flows out from this valve to the air conditioner indoor unit 100. Figure 2 Only one air conditioner indoor unit 100 is shown in

[0048] When this utility model is specifically applied, the second interface of the pressure relief valve and the inspection port on the air conditioner low-pressure valve 105 are fixedly docked through a detachable connection structure. When the switch knob 116 rotates in the first direction to drive the first thimble 115 to move outwards, the first thimble 115 can drive the second thimble 117 to retract into the inspection port, so that the second interface of the pressure relief valve and the inspection port on the air conditioner low-pressure valve 105 are both in an open state and communicate with each other. When the first thimble 115 retracts into the second interface of the pressure relief valve to make the second interface of the pressure relief valve in a closed state, the second thimble 117 extends out of the inspection port under the reset spring force of the second spring to make the inspection port in a closed state.

[0049] The inspection port on the air conditioner low-pressure valve 105 is equipped with a sealing cover. In practical applications, the sealing cover is typically removed first, and then the second port of the pressure relief valve is connected to the inspection port on the air conditioner low-pressure valve 105. After the refrigeration oil is filled, the pressure relief valve 106 is removed and the sealing cover on the inspection port is reinstalled. It is understood that the connection between the second port of the pressure relief valve and the inspection port on the air conditioner low-pressure valve 105 can adopt various conventional pipe connection structures, such as a threaded connection, a fixed connection using fixing bolts, a plug-in clip connection, a rotating clip connection, etc.

[0050] In a preferred embodiment of the present invention, the filling of refrigeration oil can generally be implemented according to the following steps:

[0051] S100: The pressure relief valve 106 is in the closed state in advance. Connect the pressure relief valve 106 to the inspection port on the air conditioner low pressure valve 105. The air conditioner is a pre-connected integral device. The pressure relief valve 106 has an on / off function. There is a "first pin 115" in the center of the second interface of the pressure relief valve. Turn the switch knob 116 clockwise, and the first pin 115 will bulge upward (see Figure 4 and Figure 5 ), contacts the second ejector pin 117 at the inspection port and lifts the second ejector pin 117 upward, thereby realizing the "opening" function of the second ejector pin 117 of the air conditioner inspection port; conversely, when the switch knob 116 is turned counterclockwise, the first ejector pin 115 in the center of the pressure relief valve 116 will retract downward toward the inside of the pressure relief valve 116 (see Figure 4 and Figure 5 The advantage of the utility model using the pressure relief valve 106 with a switching function is that it can prevent air from entering or causing the air conditioning refrigerant to escape when connected to the air conditioning inspection port.

[0052] S110: Expel the air from the filling device, add the refrigeration oil from the syringe 113 (or other filling alternative equipment) into the refrigeration oil temporary storage container 110 through the connecting pipe 112, and allow the refrigeration oil to flow through the first connecting pipe 107, and expel the air from the oil discharge structure where the first connecting pipe is connected to the pressure relief valve. If the refrigeration oil overflows from the oil discharge structure, the air inside the filling device is expelled. The preferred method adopted by the present invention is to loosen the connection between the connector 114 of the first connecting pipe 107 and the pressure relief valve 106 a little, and if the refrigeration oil overflows from the connector 114, the air in the filling device is expelled, and then tighten the connector 114 to ensure that the connector 114 is securely connected to the pressure relief valve 106. In some alternative embodiments, this can also be achieved through an independently set oil discharge hole, which is correspondingly provided with a sealing plug.

[0053] S120: Filling the compressor with refrigeration oil. The syringe 113 has a refrigeration oil capacity scale. The refrigeration oil required for quantitative filling is fully injected into the refrigeration oil temporary storage container 110. The first stop valve 111 is closed. Then, the switch knob 116 of the pressure relief valve 106 is turned clockwise to open the pressure relief valve 106. The first ejector pin 115 simultaneously pushes the second ejector pin 117 upward to open the inspection port. The pressure relief valve 106 is connected to the air conditioner low-pressure valve 105. The air conditioner is turned on the cooling mode. The suction side of the compressor generates a certain degree of negative pressure, which draws the refrigeration oil in the refrigeration oil temporary storage container 110 into the compressor. The utility model is designed with a pressure gauge 109 on the first connecting pipe 107. The refrigeration oil pressure parameter in the pipe can be observed from the pressure gauge 109. When the pointer of the pressure gauge 109 drops to 0 or a negative number, it proves that the refrigeration oil in the refrigeration oil temporary storage container 110 has all entered the air conditioning system, and the refrigeration oil filling process is completed. If the compressor refrigerant oil is added too slowly during the filling process, the air conditioner high-pressure valve 104 can be temporarily closed. When the air conditioner high-pressure valve 104 is closed, the compressor exhaust is blocked, which increases the suction volume. Rapid suction will generate a greater negative pressure, and the refrigerant oil in the refrigerant oil temporary storage container 110 will be sucked into the compressor more quickly. Then, the air conditioner high-pressure valve 104 can be opened in time to complete the refrigerant oil filling. If the amount of refrigerant oil added in one time is not enough, the above steps can be repeated to continue filling. After the refrigerant oil filling process is completed, the next step of the filling device disassembly process S130 can be carried out;

[0054] S130: To disassemble the filling device, first confirm that the pressure relief valve 106 is in the closed state (that is, the inspection port of the air-conditioning low-pressure valve 105 is restored to the closed state), then remove the pressure relief valve 106 to complete the disassembly and separation of the filling device, restore the sealing cover at the inspection port, and tighten it with a wrench to prevent fluorine leakage.

Claims

1. Refrigerant oil filling device for air conditioner compressor, comprising a first connecting pipe (107) and a refrigerant oil temporary storage container (110), the refrigerant oil temporary storage container (110) being a closed container with an openable and closable feed inlet, one end of the first connecting pipe (107) being communicated with the refrigerant oil temporary storage container (110), characterized in that: One end of the first connecting pipe (107) far from the refrigerant oil storage container (110) is connected with a pressure relief valve (106). The pressure relief valve (106) includes a pressure relief valve cavity, a first pressure relief valve interface and a second pressure relief valve interface that are respectively communicated with the pressure relief valve cavity. The first pressure relief valve interface is correspondingly connected to the first connecting pipe (107), and there is an oil discharge structure that can be opened and closed at the connection. A first thimble (115) that can reciprocate axially along the pressure relief valve cavity is arranged in the second pressure relief valve interface. The first thimble (115) is provided with a switch knob (116). When the switch knob (116) rotates in the first direction, it can drive the first thimble (115) to move outwards so that the second pressure relief valve interface is in an open state. When the switch knob (116) rotates in the second direction, the first thimble (115) retracts so that the second pressure relief valve interface is in a closed state. The second pressure relief valve interface has a connection port that matches the inspection port on the air-conditioning low-pressure valve (105) in the air-conditioning connection pipe.

2. The refrigerant oil filling device for an air-conditioning compressor according to claim 1, wherein: The openable and closable feed port of the refrigerant oil storage container (110) includes a second connecting pipe (112) and a first stop valve (111) arranged on the second connecting pipe (112).

3. The refrigerant oil filling device for an air-conditioning compressor according to claim 2, characterized in that: One end of the second connecting pipe (112) far from the refrigerant oil storage container (110) is connected in a matching manner with a syringe (113), and the injection needle of the syringe (113) is inserted into the second connecting pipe (112) with a clearance fit.

4. The refrigerant oil filling device for an air-conditioning compressor according to claim 1, characterized in that: A pressure gauge (109) for detecting the fluid pressure in the pipeline is arranged on the first connecting pipe (107).

5. The refrigerant oil filling device for an air-conditioning compressor according to claim 4, characterized in that: The pressure gauge (109) is arranged on the first connecting pipe (107) through a three-way pipe joint (108).

6. The refrigerant oil filling device for an air-conditioning compressor according to claim 1, wherein: The end of the first connecting pipe (107) is butted against the first pressure relief valve interface through a connector (114).

7. Connection structure between the refrigerant oil filling device of an air conditioner compressor and the air conditioner, including the refrigerant oil filling device of the air conditioner compressor and the air conditioner. The air conditioner includes an indoor unit (100) and an outdoor unit (101) of the air conditioner. A thin refrigerant pipe (102) and a thick refrigerant pipe (103) are arranged between the indoor unit (100) and the outdoor unit (101) of the air conditioner. The thin refrigerant pipe (102) is correspondingly connected to the evaporator inlet of the indoor unit (100) of the air conditioner, and the thick refrigerant pipe (103) is correspondingly connected to the evaporator outlet of the indoor unit (100) of the air conditioner. An air conditioner high-pressure valve (104) is connected to the thin refrigerant pipe (102), and an air conditioner low-pressure valve (105) is arranged on the thick refrigerant pipe (103). An inspection port is arranged on the air conditioner low-pressure valve (105), and the opening and closing of the internal flow passage thereof are controlled by a second thimble (117) that reciprocates axially along it. The second thimble (117) is provided with a second spring. It is characterized in that: The refrigerant oil filling device for an air-conditioning compressor adopts the refrigerant oil filling device for an air-conditioning compressor described in any one of claims 1 to 6. The second pressure relief valve interface and the inspection port on the air-conditioning low-pressure valve (105) are fixedly butted through a detachable connection structure. When the switch knob (116) rotates in the first direction to drive the first thimble (115) to move outwards, the first thimble (115) can drive the second thimble (117) to retract towards the inside of the inspection port so that the second pressure relief valve interface and the inspection port on the air-conditioning low-pressure valve (105) are simultaneously in an open state and communicated with each other. When the first thimble (115) retracts into the second pressure relief valve interface so that the second pressure relief valve interface is in a closed state, the second thimble (117) extends outwards of the inspection port under the reset spring force of the second spring so that the inspection port is in a closed state.

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