A liquid receiver and compressor

Abstract

This invention provides a liquid receiver and a compressor. The liquid receiver has a fixing member positioned at the oil return port corresponding to the outlet pipe, forming an oil return chamber between the fixing member and the outer wall of the outlet pipe. The fixing member has an oil return port, and the oil return port, oil return chamber, and oil return port are sequentially connected to form an oil return channel. An air bladder is installed within the oil return chamber, and the air bladder can expand or contract under external pressure to close or open the oil return channel. In this embodiment, through the cooperation of the air bladder and the fixing member, the air bladder can flexibly adjust the opening and closing of the oil return channel according to external pressure, thereby achieving dynamic adjustment of the liquid receiver's oil return capacity. This allows the liquid receiver to effectively control the flow of refrigerant and refrigeration oil under different operating conditions, thus meeting the compressor's oil and liquid return capacity requirements under different operating conditions and improving the compressor's operating efficiency.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a liquid receiver and a compressor. Background Technology

[0002] In existing air conditioning systems, the compressor is equipped with a receiver for storing liquid refrigerant and refrigeration oil. The receiver is generally equipped with an oil return hole, through which the liquid refrigerant and refrigeration oil flow back into the air conditioning system, enabling the compressor to have an oil and liquid return function. Existing technology generally adjusts the compressor's oil and liquid return capacity by setting the number of oil return holes. However, this method cannot meet the compressor's oil and liquid return capacity requirements under different operating conditions. Summary of the Invention

[0003] This invention provides a liquid receiver and a compressor, aiming to solve the problem that existing liquid receivers cannot meet the requirements of compressor oil return and liquid return capacity under different operating conditions.

[0004] This invention provides a liquid reservoir, including a reservoir housing and an outlet pipe. The reservoir housing has a receiving cavity, and one end of the outlet pipe extends into the receiving cavity. The outlet pipe is provided with an oil return hole. The liquid reservoir also includes an air bladder and a fixing member. The fixing member is disposed on the outlet pipe at a position corresponding to the oil return hole. An oil return cavity is formed between the fixing member and the outer wall of the outlet pipe. The air bladder is installed in the oil return cavity. The fixing member is provided with an oil return port. The oil return port, the oil return cavity, and the oil return hole are sequentially connected to form an oil return channel. The air bladder can expand or contract under external pressure to close or open the oil return channel.

[0005] Specifically, the reservoir has a first pressure in the first operating state and a second pressure in the second operating state, and the airbag has a third pressure inside, with the first pressure, third pressure and second pressure increasing sequentially; the airbag expands in the direction away from the oil return hole under the first pressure to open the oil return channel, and contracts in the direction closer to the oil return hole under the second pressure to close the oil return channel.

[0006] Specifically, the fixing member is an annular fixing member that is arranged around the air outlet pipe, and the airbag is an annular airbag.

[0007] Specifically, multiple oil return holes are provided at the same height in the axial direction of the air outlet pipe, and the annular fixing member and the annular airbag are both arranged around the outside of the multiple oil return holes.

[0008] Specifically, the annular fixing member is provided with a return oil groove with its opening facing the air outlet pipe, and the return oil groove and the outer pipe wall of the air outlet pipe form the return oil cavity.

[0009] Specifically, the opening of the oil return groove gradually narrows towards the air outlet pipe.

[0010] Specifically, the oil return port is located on the side of the fixing member near the air outlet pipe.

[0011] Specifically, the cross-sectional dimensions of the fixing member along the axial direction of the air outlet pipe satisfy the following conditions:

[0012] d1 = d2 = (0.4 - 0.6) * d

[0013] D1 = (3-5) * D2 = (1.2-1.8) * D

[0014] D = (1.6 - 2.4) * d

[0015] Where D is the maximum dimension of the fastener along the axial direction of the vent pipe in the cross section, d is the size of the slot of the fastener facing the vent pipe, d1 is the diameter of the oil return port, d2 is the diameter of the oil return hole, D1 is the maximum dimension of the fastener along the radial direction of the vent pipe in the cross section, and D2 is the distance between the oil return port and the vent pipe along the radial direction of the vent pipe.

[0016] Specifically, multiple oil return holes are provided, and the multiple oil return holes are axially distributed at different heights of the air outlet pipe. The airbag and the fixing member are arranged in groups, and multiple groups are arranged corresponding to the multiple oil return holes. Each group includes an airbag and a fixing member.

[0017] Embodiments of the present invention also provide a compressor, including the liquid receiver as described above.

[0018] This invention provides a liquid receiver and a compressor. The liquid receiver has a fixing member positioned at the oil return port corresponding to the outlet pipe, forming an oil return chamber between the fixing member and the outer wall of the outlet pipe. The fixing member has an oil return port, and the oil return port, oil return chamber, and oil return port are sequentially connected to form an oil return channel. An air bladder is installed within the oil return chamber, and the air bladder can expand or contract under external pressure to close or open the oil return channel. In this embodiment, through the cooperation of the air bladder and the fixing member, the air bladder can flexibly adjust the opening and closing of the oil return channel according to external pressure, thereby achieving dynamic adjustment of the liquid receiver's oil return capacity. This allows the liquid receiver to effectively control the flow of refrigerant and refrigeration oil under different operating conditions, thus meeting the compressor's oil and liquid return capacity requirements under different operating conditions and improving the compressor's operating efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An internal structural diagram of a liquid reservoir provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view of the A structure;

[0022] Figure 3 Another internal structural diagram of a liquid reservoir provided in an embodiment of the present invention;

[0023] Figure 4 for Figure 3 Enlarged view of the B structure;

[0024] Figure 5 This is a structural schematic diagram of the fastener;

[0025] Figure 6 A structural schematic diagram of the fastener from another angle;

[0026] Figure 7 This is a schematic diagram of the airbag structure;

[0027] Figure 8 This is a schematic diagram showing the installation of the fasteners and the airbag.

[0028] Figure 9 This is a schematic diagram showing the dimensions of the fastener's cross-section;

[0029] Figure 10 This is a schematic diagram showing another dimension of the fastener's cross-section.

[0030] Explanation of the markings in the image:

[0031] 1. Liquid reservoir; 11. Liquid reservoir housing; 12. Air outlet pipe; 121. Oil return hole; 13. Receiving cavity; 14. Airbag; 15. Fixing component; 151. Oil return port; 152. Oil return groove. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0034] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0036] In conventional air conditioning systems, during the process of refrigerant flowing from the evaporator to the compressor's receiver, the liquid refrigerant in the evaporator undergoes incomplete evaporation. Simultaneously, the refrigerant carries away some lubricating oil from the system during its circulation. Therefore, gaseous refrigerant, liquid refrigerant, and lubricating oil all enter the receiver together. The presence of liquid refrigerant and lubricating oil in the compressor can lead to excessively high oil content in the refrigerant. To address this, a filter assembly and baffles are installed in the receiver to separate the lubricating oil and liquid refrigerant, storing them in a designated compartment. At this point, only gaseous refrigerant can escape from the receiver. The refrigerant and refrigeration oil enter the compressor, but the liquid refrigerant and refrigeration oil cannot be stored in the receiving cavity indefinitely. Therefore, oil return holes of a certain height and number are set in the receiver to achieve the oil and liquid return function. However, this traditional method cannot achieve the function of automatically adjusting the oil and liquid return capacity, which will limit the system's capacity and energy efficiency under certain operating conditions. For example, under the maximum operating cooling or low-temperature heating conditions, the system needs the compressor to return oil and liquid in a timely manner to ensure sufficient refrigerant in the system. Under intermediate cooling conditions, it is necessary to reduce the compressor's oil and liquid return to avoid liquid slugging in the compressor suction and ensure stable compressor operation. Therefore, the present invention provides a receiver 1 that can control the opening and closing of the oil return holes according to different operating conditions to achieve different oil and liquid return requirements. For details, please refer to Figure 1-4 This invention provides a liquid reservoir 1, including a liquid reservoir housing 11 and an exhaust pipe 12. The liquid reservoir housing 11 has a receiving cavity 13. One end of the exhaust pipe 12 extends into the receiving cavity 13. An oil return hole 121 is provided on the exhaust pipe 12. The liquid reservoir 1 also includes an airbag 14 and a fixing member 15. The fixing member 15 is located on the exhaust pipe 12 corresponding to the position of the oil return hole 121. An oil return cavity is formed between the fixing member 15 and the outer wall of the exhaust pipe 12. The airbag 14 is installed in the oil return cavity. An oil return port 151 is provided on the fixing member 15. The oil return port 151, the oil return cavity, and the oil return hole 121 are sequentially connected to form an oil return channel. The airbag 14 can expand or contract under external pressure to close or open the oil return channel.

[0037] In this embodiment, the receiver 1 is applied to the compressor. The receiving cavity 13 in the receiver 1 is used to store refrigerant and refrigeration oil. One end of the outlet pipe 12 extends from the bottom of the receiver housing 11 into the receiving cavity 13. The oil return hole 121 on the outlet pipe 12 connects the receiving cavity 13 and the interior of the outlet pipe 12, so that the refrigerant and / or refrigeration oil can enter the interior of the outlet pipe 12 from the receiving cavity 13 and be discharged through the other end of the outlet pipe 12 and flow into the compressor. The amount of oil returned by the oil return hole 121 reflects the oil return capacity of the compressor (in this invention, for the sake of simplification, terms such as oil return amount, oil return channel, and oil return capacity are used, but these terms can also be understood as liquid return amount, liquid return channel, liquid return capacity, etc.). However, under different operating conditions, the receiver 1 needs to control the opening and closing of the oil return hole 121 to control the oil return capacity of the compressor. For example, the receiver 1 opens the oil return hole 121 under the maximum cooling condition to accelerate the oil return capacity of the compressor; and closes the oil return hole 121 under intermediate cooling conditions to prevent the compressor from running with liquid. In this embodiment, a fixing member 15 is installed on the outside of the outlet pipe 12 at the position corresponding to the oil return hole 121. The fixing member 15 is provided with an oil return port 151. The fixing member 15 and the outer pipe wall of the outlet pipe 12 form an oil return chamber. The oil return port 151, the oil return chamber, and the oil return hole 121 are connected in sequence to form an oil return channel. The refrigerant or refrigeration oil in the receiving cavity 13 can enter the oil return chamber from the oil return port 151 and then flow into the outlet pipe 12 from the oil return hole 121. The air bag 14 is located in the oil return chamber, and the air bag 14 can expand or contract under the action of external pressure to control the opening and closing of the oil return channel. In this embodiment, through the cooperation of the air bag 14 and the fixing member 15, the air bag 14 can flexibly adjust the opening and closing of the oil return channel according to the external pressure, thereby realizing the dynamic adjustment of the oil return capacity of the liquid receiver 1. This allows the liquid receiver 1 to effectively control the flow of refrigerant and refrigeration oil under different operating conditions, thereby improving the operating efficiency of the compressor.

[0038] Specifically, such as Figure 1-4 As shown, the reservoir 1 has a first pressure in the first operating state and a second pressure in the second operating state, and the airbag 14 has a third pressure inside. The first pressure, the third pressure, and the second pressure increase in sequence. Under the first pressure, the airbag 14 expands in the direction away from the return oil hole 121 to open the return oil passage, and under the second pressure, it contracts in the direction closer to the return oil hole 121 to close the return oil passage.

[0039] In this embodiment, in the first operating state, the receiver 1 has a first pressure inside the housing cavity 13, the outlet pipe 12, and the oil return channel. In the second operating state, the housing cavity 13, the outlet pipe 12, and the oil return channel have a second pressure. The gas bag 14 is filled with gas at a third pressure, and the first pressure < the third pressure < the second pressure. The first operating state can be the maximum operating cooling condition or the low-temperature heating condition. In this case, the refrigeration system (such as an air conditioner) requires the compressor to return oil and liquid in a timely manner to ensure sufficient refrigerant in the system. The second operating state can be the intermediate cooling condition, in which the compressor needs to reduce oil and liquid return to avoid liquid slugging during the compressor's suction process.

[0040] In the first operating state, the pressure difference between the first and third pressures causes the gas inside the air bladder 14 to expand and move away from the oil return hole 121 to open the oil return channel. At this time, the oil return channel is opened to its maximum, allowing more refrigerant and / or refrigerant oil to enter the outlet pipe 12 from the oil return channel, thereby ensuring sufficient refrigerant circulation and refrigerant oil for lubrication in the air conditioning system, ensuring the air conditioning system's capacity, efficiency, and reliability under harsh operating conditions. In the second operating state, the pressure difference between the second and third pressures causes the gas inside the air bladder 14 to contract and move towards the oil return hole 121. At this time, the air bladder 14 completely closes the oil return channel, preventing refrigerant and / or refrigerant oil from entering the outlet pipe 12 from the oil return channel, thereby ensuring stable compressor operation, reducing refrigerant oil content, and improving system capacity and efficiency. The different operating states are determined by a combination of factors such as the external environment, cooling demand, and the air conditioning system controller. This embodiment can control the opening and closing of the oil return channel in different operating states to meet the oil return volume requirements during the operation of the receiver.

[0041] To better facilitate the movement of the airbag 14 towards the oil return hole 121 during contraction and away from the oil return hole 121 during expansion, a connector can be used to attach one end of the airbag 14 to the side near the oil return hole 121. For example, it can be connected to the air outlet pipe 12 or to the end of the fixing member 15 near the oil return hole 121. This way, during contraction, it can only move towards the oil return hole 121, while during expansion, it can move away from the oil return hole 121. The connector can be a strip-shaped connector such as a thin rope or strap, and it can be made of a soft material.

[0042] In a specific embodiment, in the second operating state, by adjusting the structure of the fixing member 15 and the gas pressure inside the airbag 14, the oil return channel can be partially closed to reduce the amount of refrigerant or refrigeration oil returning, which can also meet the oil return requirements of the liquid receiver.

[0043] Specifically, such as Figure 3-8 As shown, the fixing member 15 is an annular fixing member that is arranged around the air outlet pipe, and the airbag 14 is an annular airbag.

[0044] In this embodiment, in order to improve the sealing performance of the oil return chamber and facilitate manufacturing and installation, the fixing member 15 is preferably set as an annular fixing member. The annular fixing member is wound around the air outlet pipe 12 at the position corresponding to the oil return hole 121. Correspondingly, the air bag 14 is also set as an annular air bag. The annular air bag expands and contracts between the annular fixing member and the outer wall of the air outlet pipe 12, thereby realizing the opening and closing of the oil return channel.

[0045] Specifically, the fastener 15 is provided with an oil return groove 152 with its opening facing the air outlet pipe 12, and an oil return cavity is formed between the oil return groove 152 and the outer pipe wall of the air outlet pipe 12.

[0046] In this embodiment, the opening of the oil return groove 152 faces the side of the outlet pipe 12, and an oil return cavity is formed between the oil return groove 152 and the outer wall of the outlet pipe 12. When the fixing member 15 is an annular fixing member, the oil return cavity is an annular oil return cavity. Correspondingly, the air bag 14 is an annular air bag. The annular air bag expands or contracts within the annular oil return cavity, thereby controlling the opening and closing of the oil return channel. Moreover, the annular design of the oil return cavity allows the refrigerant or refrigeration oil to be evenly distributed and flow quickly to the oil return hole 121, improving the flow efficiency.

[0047] Specifically, the opening of the oil return groove 152 gradually narrows towards the air outlet pipe 12.

[0048] In this embodiment, the inside of the fixing member 15 is provided with an oil return groove 152. The groove opening of the oil return groove 152 is set towards the air outlet pipe 12, and the diameter of the groove opening facing the air outlet pipe 12 is set to be smaller, while the diameter of the groove opening away from the air outlet pipe 12 is set to be larger. In this way, the internal space of the oil return groove 152 away from the air outlet pipe 12 is larger, so that the cross-section of the fixing member 15 is similar to a horseshoe shape. This shape can better utilize the space inside the groove, provide a suitable expansion space for the airbag 14, and also help the fixing member 15 to fit tightly against the outer pipe wall of the air outlet pipe 12, thereby improving the sealing effect and preventing the refrigerant oil from leaking in the oil return channel. Moreover, this shape can disperse the pressure difference of the liquid reservoir 1 under different operating conditions to a certain extent, preventing the fixing member 15 from deforming under the action of external pressure, thereby enhancing the structural stability of the fixing member 15.

[0049] Specifically, such as Figure 1-4 As shown, the oil return port 151 is located on the side of the fixing member 15 near the air outlet pipe 12.

[0050] In this embodiment, since the airbag 14 expands or contracts under external pressure, when the airbag 14 expands, it moves away from the oil return hole 121, that is, away from the air outlet pipe 12. In order to allow the refrigerant or refrigeration oil in the receiving cavity 13 to smoothly enter the oil return cavity from the oil return port 151, it is preferable to set the oil return port 151 on the side of the fixing member 15 close to the air outlet pipe 12, so that when the airbag 14 expands, the oil return port 151 is not blocked by the airbag 14, the oil return channel is opened, thereby facilitating the flow of refrigerant or refrigeration oil. When the airbag 14 contracts, it approaches the oil return hole 121, i.e., the air outlet pipe 12. The airbag 14 can block the oil return hole 121, thereby preventing refrigerant or refrigerant oil from flowing into the air outlet pipe 12. In addition, another advantage of setting the oil return port 151 on the side of the fixing member 15 near the air outlet pipe 12 is that when the airbag 14 contracts, it approaches the oil return hole 121, which can not only block the oil return hole 121, but also block the oil return port 151, thereby improving the oil and liquid blocking effect. It should be noted that in other embodiments, when the airbag 14 contracts and approaches the oil return hole 121, although the oil return port 151 is set on the side near the air outlet pipe 12, the airbag 14 may not be able to block the oil return port 151. Refrigerant or refrigerant oil can still flow into the oil return chamber from the oil return port 151, but because the airbag 14 has blocked the oil return hole 121, the refrigerant or refrigerant oil cannot flow into the air outlet pipe 12.

[0051] like Figure 9-10 As shown, in order to ensure that the airbag 14 can effectively open or close the oil return hole 121 when it expands or contracts, the cross-sectional dimensions of the fixing member 15 along the axial direction of the air outlet pipe 12 must meet the following conditions:

[0052] d1 = d2 = (0.4 - 0.6) * d

[0053] D1 = (3-5) * D2 = (1.2-1.8) * D

[0054] D = (1.6 - 2.4) * d

[0055] Wherein, D is the maximum dimension of the fixing member 15 along the axial direction of the air outlet pipe 12 in the cross section, d is the size of the slot of the fixing member 15 facing the air outlet pipe 12, d1 is the diameter of the oil return port 151, d2 is the diameter of the oil return hole 121, D1 is the maximum dimension of the fixing member 15 along the radial direction of the air outlet pipe 12 in the cross section, and D2 is the distance between the oil return port 151 and the air outlet pipe 12 along the radial direction of the air outlet pipe 12.

[0056] Specifically, multiple oil return holes 121 are provided at the same height in the axial direction of the air outlet pipe 12, and the annular fixing member and the annular airbag are arranged around the outside of the multiple oil return holes 121.

[0057] In this embodiment, to increase the oil and liquid return capacity of the reservoir, multiple oil return holes 121 can be provided at the same height in the axial direction of the vent pipe 12. Only one annular fixing member and one annular airbag need to be arranged around the outside of the multiple oil return holes 121. When the same annular airbag 14 expands or contracts, multiple oil return holes 121 can be opened or closed simultaneously. In this way, when more refrigerant and refrigeration oil are needed, the annular airbag 14 automatically expands, so that the refrigerant and refrigeration oil can flow into the vent pipe 12 from the multiple oil return holes 121 at the same time, which improves the speed of oil and liquid return. When no refrigerant and refrigeration oil are needed or only a small amount of refrigerant and refrigeration oil are needed, the annular airbag 14 automatically contracts, so that the refrigerant and refrigeration oil cannot flow into the vent pipe 12 from the multiple oil return holes 121, which improves the oil and liquid blocking effect.

[0058] Specifically, multiple oil return holes 121 are provided, and the multiple oil return holes 121 are axially distributed at different heights of the air outlet pipe 12. The airbag 14 and the fixing member 15 are arranged in groups, and multiple groups are arranged corresponding to the multiple oil return holes 121. Each group includes an airbag 14 and a fixing member 15.

[0059] In this embodiment, multiple oil return holes 121 are provided, and these multiple oil return holes 121 are axially arranged on the outlet pipes 12 at different heights. Correspondingly, each oil return hole 121 is provided with a set of air bladders 14 and fixing members 15 to control the opening and closing of each oil return hole 121. By providing multiple oil return holes 121, this embodiment can increase the speed of oil and liquid return from the liquid receiver 1 or improve the oil and liquid blocking effect. Furthermore, the oil return holes 121 at different heights can prevent the refrigerant or refrigeration oil in the receiving cavity 13 from entering the outlet pipe 12 too quickly when it reaches a certain liquid level, thus avoiding unstable compressor suction.

[0060] Specifically, the material of fastener 15 is rigid.

[0061] The advantage of using a rigid material is that the fastener 15 can provide stable support and fixation, ensuring precise alignment between the airbag 14 and the oil return port 121. The rigid material helps maintain the structural stability of the oil return chamber, preventing deformation under changes in external pressure, thereby ensuring the reliability of the oil return channel.

[0062] Embodiments of the present invention also provide a compressor, including the liquid receiver as described above.

[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A liquid reservoir, comprising a reservoir housing and a vent pipe, wherein the reservoir housing has a receiving cavity, one end of the vent pipe extends into the receiving cavity, and the vent pipe is provided with an oil return hole, characterized in that, The liquid reservoir further includes an air bladder and a fixing member. The fixing member is positioned on the air outlet pipe corresponding to the oil return hole. An oil return cavity is formed between the fixing member and the outer wall of the air outlet pipe. The air bladder is installed in the oil return cavity. An oil return port is provided on the fixing member. The oil return port, the oil return cavity, and the oil return hole are sequentially connected to form an oil return channel. The air bladder can expand or contract under external pressure to close or open the oil return channel.

2. The liquid reservoir according to claim 1, characterized in that, The reservoir has a first pressure in a first operating state and a second pressure in a second operating state, and the airbag has a third pressure inside. The first pressure, the third pressure, and the second pressure increase sequentially. The airbag expands in the direction away from the oil return hole under the first pressure to open the oil return channel, and contracts in the direction closer to the oil return hole under the second pressure to close the oil return channel.

3. The liquid reservoir according to claim 1, characterized in that, The fixing member is an annular fixing member that is arranged around the air outlet pipe, and the airbag is an annular airbag.

4. The liquid reservoir according to claim 3, characterized in that, Multiple oil return holes are provided at the same height in the axial direction of the air outlet pipe, and the annular fixing member and the annular airbag are both arranged around the outside of the multiple oil return holes.

5. The liquid reservoir according to claim 1, characterized in that, The fastener is provided with an oil return groove with its opening facing the air outlet pipe, and the oil return groove and the outer wall of the air outlet pipe form the oil return cavity.

6. The liquid reservoir according to claim 5, characterized in that, The opening of the oil return groove gradually narrows towards the air outlet pipe.

7. The liquid reservoir according to claim 1, characterized in that, The oil return port is located on the side of the fixing member near the air outlet pipe.

8. The liquid reservoir according to claim 1, characterized in that, The cross-sectional dimensions of the fixing member along the axial direction of the air outlet pipe satisfy the following conditions: d1 = d2 = (0.4 - 0.6) * d D1 = (3-5) * D2 = (1.2-1.8) * D D = (1.6 - 2.4) * d Where D is the maximum dimension of the fastener along the axial direction of the vent pipe in the cross section, d is the size of the slot of the fastener facing the vent pipe, d1 is the diameter of the oil return port, d2 is the diameter of the oil return hole, D1 is the maximum dimension of the fastener along the radial direction of the vent pipe in the cross section, and D2 is the distance between the oil return port and the vent pipe along the radial direction of the vent pipe.

9. The liquid reservoir according to claim 1, characterized in that, Multiple oil return holes are provided, and the multiple oil return holes are axially distributed at different heights of the air outlet pipe. The airbag and the fixing member are arranged in groups, and multiple groups are arranged corresponding to the multiple oil return holes. Each group includes an airbag and a fixing member.

10. A compressor, characterized in that, Includes the reservoir as described in any one of claims 1-9.

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