Stop device, gas-liquid separator and compressor assembly

Abstract

The utility model discloses a cut-off device, a gas-liquid separator and a compressor assembly. The cut-off device comprises a shell sleeve and a cut-off plug. The cut-off device is used for a gas-liquid separator of the compressor, and the gas-liquid separator comprises a gas return pipe. The lower end of the shell sleeve is suitable for being connected with the upper end of an air return pipe; the cut-off plug is arranged in the shell sleeve and used for conducting or blocking the shell sleeve. According to the cut-off device, the air return requirement of the compressor can be met, lubricating oil can be prevented from being pressed back into the gas-liquid separator, the reliability of the gas-liquid separator and the compressor can be improved, and the service life of the gas-liquid separator and the compressor can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a cut-off device, a gas-liquid separator and a compressor component. Background Art

[0002] In the related technology, the multi-split components with high-speed rotary compressors are mostly in the scene of long piping and high drop. When the rotary compressor stops, the multi-split components will take a long time and slow to balance the pressure due to the long system pipeline and high resistance. At this time, the air pressure difference in the system can easily push the lubricating oil in the oil pool of the compressor back to the return pipe and then stay in the gas-liquid separator, affecting the performance and life of the gas-liquid separator. In addition, it will cause the oil level of the compressor body to be lower than the specified minimum oil level. When the compressor is turned on next time, it is easy to fail to start due to lack of oil lubrication, which poses a serious reliability risk. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a cut-off device, which can not only meet the return air demand of the compressor, but also prevent the lubricating oil from being pressed back into the gas-liquid separator, thereby improving the reliability and service life of the gas-liquid separator and the compressor.

[0004] The utility model also provides a gas-liquid separator for a compressor, and the gas-liquid separator for the compressor comprises the above-mentioned cut-off device.

[0005] The utility model also provides a compressor assembly, which includes the above-mentioned gas-liquid separator for the compressor.

[0006] According to an embodiment of the utility model, the cut-off device comprises: a shell and a cut-off plug. The cut-off device is used for a gas-liquid separator of a compressor, and the gas-liquid separator comprises a return air pipe. The upper and lower ends of the shell are open, and the lower end of the shell is suitable for connecting with the upper end of the return air pipe; the cut-off plug is arranged in the shell to conduct or block the shell.

[0007] According to the cut-off device of the embodiment of the utility model, by connecting the shell sleeve at the upper end of the return air pipe and setting the cut-off plug in the shell sleeve to be able to conduct or block the shell sleeve, when the compressor is operating normally, the cut-off plug can be connected to the shell sleeve to meet the normal return air demand of the compressor and ensure the normal operation and performance of the compressor. At the same time, when the compressor is shut down and stops operating, the cut-off plug can be blocked by the shell sleeve, effectively preventing the lubricating oil in the compressor from being pressed into the return air pipe and entering the gas-liquid separator under the action of the pressure difference, thereby ensuring the performance and service life of the gas-liquid separator, and ensuring that the compressor can be started normally again, thereby enhancing the reliability and stability of the compressor.

[0008] According to some embodiments of the utility model, in a top-to-bottom direction, the shell sleeve includes a first sleeve, a first connecting pipe and a second sleeve which are connected in sequence, the inner diameter of the first sleeve is smaller than the inner diameter of the second sleeve, and the second sleeve is suitable for being connected to the upper end of the return air pipe and being communicated with the return air pipe; the stop plug is movably arranged in the shell sleeve along the up and down directions, and when the stop plug is connected to the shell sleeve, the outer surface of the stop plug is spaced apart from the inner circumferential wall of the shell sleeve, and when the stop plug blocks the shell sleeve, the outer circumferential wall of the stop plug stops at the first connecting pipe or the connection between the first connecting pipe and the first sleeve.

[0009] In some embodiments of the present invention, the cut-off device further comprises an elastic member, wherein the elastic member is disposed in the shell and connected to the cut-off plug.

[0010] In some embodiments of the present invention, the elastic member is a spring, and the spring is sleeved outside the stop plug.

[0011] In some embodiments of the present invention, the cross-sectional area of ​​the stopper gradually increases from top to bottom.

[0012] In some embodiments of the present invention, the cross-sections of the first sleeve and the first connecting pipe are circular, and the stop plug is conical or truncated cone-shaped.

[0013] In some embodiments of the present invention, the shell sleeve also includes a third sleeve and a second connecting pipe, the third sleeve is located below the second sleeve, one end of the second connecting pipe is connected to the second sleeve, and the other end is connected to the third sleeve, the inner diameter of the third sleeve is smaller than the inner diameter of the second sleeve, and the third sleeve is suitable for connecting to the upper end of the return air pipe.

[0014] According to the embodiment of the utility model, the gas-liquid separator for the compressor comprises: a shell, a return air pipe and the above-mentioned cut-off device. The upper end of the shell has an air inlet; the upper end of the return air pipe extends into the shell from the lower end of the shell; the shell sleeve is arranged in the shell, and the lower end of the shell sleeve is connected to the upper end of the return air pipe.

[0015] According to the gas-liquid separator for the compressor in the embodiment of the utility model, by connecting the shell casing at the upper end of the return air pipe and arranging the shut-off plug arranged in the shell casing to be able to conduct or block the shell casing, when the compressor is operating normally, the shut-off plug can conduct the shell casing to meet the normal return air demand of the compressor and ensure the normal operation and performance of the compressor. At the same time, when the compressor is shut down and stops operating, the shut-off plug can block the shell casing, effectively preventing the lubricating oil in the compressor from being pressed into the return air pipe and entering the gas-liquid separator under the action of the pressure difference, thereby ensuring the reliability, stability and service life of the gas-liquid separator.

[0016] The compressor assembly according to the embodiment of the utility model comprises: a compressor and the above-mentioned gas-liquid separator for the compressor. The compressor has an air return port; the lower end of the air return pipe is connected to the air return port.

[0017] According to the compressor assembly of the embodiment of the utility model, by connecting the shell sleeve at the upper end of the return air pipe of the gas-liquid separator and setting the shut-off plug in the shell sleeve to be able to conduct or block the shell sleeve, the shut-off plug can be made to conduct the shell sleeve when the compressor is operating normally to meet the normal return air demand of the compressor and ensure the normal operation and performance of the compressor. At the same time, when the compressor is shut down and stops operating, the shut-off plug can be made to block the shell sleeve, effectively preventing the lubricating oil in the compressor from being pressed into the return air pipe and entering the gas-liquid separator under the action of the pressure difference, thereby ensuring the performance and service life of the gas-liquid separator and ensuring that the compressor can be started normally again, thereby enhancing the reliability and stability of the compressor, and thus enhancing the reliability and service life of the compressor assembly.

[0018] In some embodiments of the utility model, there is one return air port, one return air pipe, and one cut-off device; or, there are two return air ports spaced apart, there are two return air pipes corresponding to the two return air ports, and there are two cut-off devices corresponding to the two return air pipes.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a front view of a compressor assembly according to an embodiment of the utility model;

[0022] Figure 2 is a front view of a cut-off device according to an embodiment of the utility model;

[0023] Figure 3 is a cross-sectional view of a cut-off device according to an embodiment of the utility model, wherein the cut-off plug is connected to the shell;

[0024] Figure 4 It is a cross-sectional view of a cut-off device according to an embodiment of the utility model, wherein the cut-off plug seals the shell.

[0025] Reference numerals:

[0026] 100. Cut-off device;

[0027] 1. Shell; 11. First sleeve; 12. First connecting pipe; 13. Second sleeve; 14. Second connecting pipe; 15. Third sleeve;

[0028] 2. Stop plug;

[0029] 3. Elastic parts;

[0030] 200. Gas-liquid separator;

[0031] 4. Shell;

[0032] 5. Air return pipe;

[0033] 300. Compressor assembly;

[0034] 6. Compressor; 61. Air return port. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The cut-off device 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0039] like Figure 2 and Figure 3 As shown, the cut-off device 100 according to the embodiment of the utility model comprises a housing 1 and a cut-off plug 2 .

[0040] Specifically, Figure 1 As shown, combined Figure 3 and Figure 4 The cut-off device 100 is used for the gas-liquid separator 200 of the compressor 6, and the gas-liquid separator 200 includes a shell 4 and a return air pipe 5. The gas-liquid separator 200 is used to separate liquid and gas, and the upper end of the return air pipe 5 penetrates into the shell 4 of the gas-liquid separator 200 from the bottom of the shell 4 of the gas-liquid separator 200, and the lower end of the return air pipe 5 is suitable for connecting with the return air port 61 of the compressor 6, and the refrigerant entering the gas-liquid separator 200, and the gas refrigerant after gas-liquid separation in the gas-liquid separator 200 enters the compressor 6 through the return air pipe 5. When the compressor 6 is running, the gas-liquid separator 200 can prevent liquid from entering the compressor 6 along with the gas to protect the compressor 6 from being damaged by liquid hammer, which is conducive to ensuring the normal operation of the compressor 6.

[0041] Furthermore, the cut-off device 100 is arranged in the gas-liquid separator 200, and the upper and lower ends of the shell 1 are open to facilitate the circulation of gas in the shell 1. The lower end of the shell 1 is suitable for connecting with the upper end of the return pipe 5, and the upper end of the return pipe 5 is a free end extending into the shell 4 of the gas-liquid separator 200. The upper end of the return pipe 5 is connected with the lower end of the shell 1, so that the gas in the gas-liquid separator 200 can enter the shell 1 and the return pipe 5 through the upper end opening of the shell 1, and enter the compressor 6 through the return pipe 5. While realizing the connection and fixation of the shell 1, it does not affect the circulation of the gas, and can meet the normal return air needs of the compressor 6.

[0042] There are multiple ways to connect the lower end of the shell 1 and the upper end of the return pipe 5. For example, the lower end of the shell 1 and the upper end of the return pipe 5 can be connected by welding, which can enhance the stability of the connection, so that the shell 1 and the return pipe 5 have good stability, sealing and structural strength. For another example, the lower end of the shell 1 and the upper end of the return pipe 5 can be connected by snapping, the upper end of the return pipe 5 is provided with a slot, and the lower end of the shell 1 is provided with a buckle. The shell 1 and the return pipe 5 are connected by the snap-fit ​​of the slot and the buckle, which achieves a stable connection and is easy to assemble. For another example, the lower end of the shell 1 and the upper end of the return air pipe 5 can also be connected by threads. The open mouth of the lower end of the shell 1 can be provided with an internal thread, and the upper end of the return air pipe 5 is provided with an external thread corresponding to the above internal thread. The upper end of the return air pipe 5 can be screwed into the open mouth of the lower end of the shell 1 and fixed by the cooperation of the internal and external threads. The structure is simple and can be flexibly disassembled and assembled while ensuring the sealing between the shell 1 and the return air pipe 5.

[0043] In addition, if Figure 3 and Figure 4 As shown, the stop plug 2 is arranged in the shell 1 for conducting or blocking the shell 1. For example, the stop plug 2 can be connected to the shell 1 in the shell 1 through a hinge, a limiting cavity or a spring that allows the stop plug 2 to move. When the compressor 6 operates normally, the stop plug 2 conducts the shell 1, and the gas can enter the shell 1 and the return air pipe 5 from the upper open end of the shell 1, and enter the compressor 6 through the return air pipe 5, which can meet the normal return air demand of the compressor 6 and ensure the normal operation and performance of the compressor 6. When the compressor 6 is shut down and stops running, the stop plug 2 blocks the shell 1, and the gas or liquid cannot enter the housing 4 of the gas-liquid separator 200 through the shell 1, which can effectively prevent the lubricating oil in the compressor 6 from being pressed into the return air pipe 5 and entering the gas-liquid separator 200 under the action of the pressure difference, thereby ensuring the performance and stability of the gas-liquid separator 200, and thus extending the service life of the gas-liquid separator 200. On the other hand, it can also prevent the lubricating oil level in the compressor 6 from being lower than the specified minimum oil level, causing the compressor 6 to be unable to start normally again, thereby reducing the risk of abnormal operation and enhancing the reliability and stability of the compressor 6.

[0044] According to the cut-off device 100 of the embodiment of the utility model, by connecting the shell casing 1 at the upper end of the return air pipe 5 and setting the cut-off plug 2 arranged in the shell casing 1 to be able to conduct or block the shell casing 1, when the compressor 6 is operating normally, the cut-off plug 2 can be connected to the shell casing 1 to meet the normal return air demand of the compressor 6, thereby ensuring the normal operation and performance of the compressor 6. At the same time, when the compressor 6 is shut down and stops running, the cut-off plug 2 can block the shell casing 1, thereby effectively preventing the lubricating oil in the compressor 6 from being pressed into the return air pipe 5 and entering the gas-liquid separator 200 under the action of the pressure difference, thereby ensuring the performance and service life of the gas-liquid separator 200, and ensuring that the compressor 6 can be started normally again, thereby enhancing the reliability and stability of the compressor 6.

[0045] In some embodiments of the present invention, Figure 2 As shown, combined Figure 3 and Figure 4 , in the direction from top to bottom, the shell 1 includes a first sleeve 11, a first connecting pipe 12 and a second sleeve 13 connected in sequence, the inner diameter of the first sleeve 11 is smaller than the inner diameter of the second sleeve 13, the first connecting pipe 12 can be a reducer, the upper and lower ends of the first connecting pipe 12 are open, the diameter of the upper open end of the first connecting pipe 12 is the same as the diameter of the first sleeve 11, and the diameter of the lower open end of the first connecting pipe 12 is the same as the diameter of the second sleeve 13, so that the first connecting pipe 12 is connected to the first sleeve 11 and the second sleeve 13 respectively. Of course, the first connecting pipe 12 can also be an annular plate structure perpendicular to the axis of the first sleeve 11 and the second sleeve 13, and the radial inner and outer ends of the first connecting pipe 12 are used to connect the lower end of the first sleeve 11 and the upper end of the second sleeve 13 respectively. By setting the first connecting pipe 12, the first sleeve 11 and the second sleeve 13 with different diameters can be connected.

[0046] In addition, the second sleeve 13 is suitable for being connected to the upper end of the return air pipe 5 and being communicated with the return air pipe 5, thereby realizing the communication between the first sleeve 11, the first connecting pipe 12, the second sleeve 13 and the return air pipe 5, so that the gas in the gas-liquid separator 200 can enter the return air pipe 5 through the first sleeve 11, the first connecting pipe 12 and the second sleeve 13 in sequence, without affecting the circulation of gas between the gas-liquid separator 200 and the compressor 6, and can meet the normal return air needs of the compressor 6.

[0047] In this application, if Figure 3 and Figure 4 As shown, the stop plug 2 is movably arranged in the shell 1 along the up and down direction. For example, the stop plug 2 can be connected to the shell 1 through a hinge, a limiting cavity or a spring that allows the stop plug 2 to move up and down, which is conducive to realizing the conduction or blocking of the shell 1 by the stop plug 2. When the stop plug 2 conducts the shell 1, the outer surface of the stop plug 2 is spaced apart from the inner peripheral wall of the shell 1, and at this time, the gas can flow in the gap between the inner peripheral wall of the shell 1 and the outer peripheral wall of the stop plug 2. When the stop plug 2 blocks the shell 1, the outer peripheral wall of the stop plug 2 stops against the first connecting pipe 12 or the connection between the first connecting pipe 12 and the first sleeve 11, and at this time, the gas cannot flow from the upper open mouth of the shell 1 to the lower open mouth of the shell 1. Among them, the inner diameter of the first sleeve 11 is smaller than the inner diameter of the second sleeve 13, so that the size of the upper open mouth of the shell 1 becomes smaller, which is convenient for the stop plug 2 to block the first sleeve 11, thereby realizing the blocking of the shell 1 by the stop plug 2.

[0048] For example, when the compressor 6 is running or stopped, a pressure difference is formed in the return air pipe 5, and the stop plug 2 can move upward or downward in the shell 1 by the force generated by the pressure difference. Of course, the stop plug 2 can also be connected to a drive motor, and the drive motor drives the stop plug 2 to move in the shell 1 in the up and down direction, thereby realizing the conduction or blocking of the shell 1 by the stop plug 2.

[0049] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the cut-off device 100 further includes an elastic member 3, which is disposed in the shell 1 and connected to the cut-off plug 2. One end of the elastic member 3 is connected to the shell 1, and the other end is connected to the cut-off plug 2. The elastic member 3 will deform under the action of an external force, and can return to its original shape after the external force is removed, so that the cut-off plug 2 is connected to the shell 1 and the cut-off plug 2 is convenient to move relative to the shell 1 in the up and down directions.

[0050] In the present application, when the compressor 6 operates normally, a pressure difference will be formed when the compressor 6 takes in air through the return air pipe 5. The pressure difference formed by the compressor 6 in the return air pipe 5 will generate a downward force on the stop plug 2, causing the stop plug 2 to move downward. The elastic member 3 can be in a stretched state, and the outer peripheral wall of the stop plug 2 is separated from the first connecting pipe 12. A space for gas flow is defined between the outer peripheral wall of the stop plug 2 and the inner peripheral wall of the shell sleeve 1. At this time, the stop plug 2 is connected to the shell sleeve 1, and the gas can enter the shell sleeve 1 from the open mouth at the upper end of the shell sleeve 1, flow to the return air pipe 5 through the gap between the shell sleeve 1 and the stop plug 2, and enter the compressor 6 through the return air pipe 5, which can meet the normal return air demand of the compressor 6 and ensure the normal operation and performance of the compressor 6.

[0051] In the present application, when the compressor 6 is shut down and stops running, it takes a certain amount of time for the compressor 6 to balance the pressure. The air pressure in the compressor 6 is greater than the air pressure in the gas-liquid separator 200. The air pressure difference formed in the return pipe 5 will generate an upward force on the stop plug 2, causing the stop plug 2 to move upward. The outer peripheral wall of the stop plug 2 and the inner peripheral wall of the first connecting pipe 12 or the connection between the first connecting pipe 12 and the first sleeve 11 stop. The elastic member 3 can be in a compressed state. At this time, the stop plug 2 blocks the shell 1, and the gas or liquid cannot enter the shell 4 of the gas-liquid separator 200 through the return pipe 5 and the shell 1. It can effectively prevent the lubricating oil in the compressor 6 from being pressed into the return pipe 5 and entering the gas-liquid separator 200 under the action of the pressure difference, ensuring the performance and stability of the gas-liquid separator 200, thereby extending the service life of the gas-liquid separator 200. On the other hand, it can also prevent the lubricating oil level in the compressor 6 from being lower than the specified minimum oil level, causing the compressor 6 to be unable to start normally again, reducing the risk of abnormal operation, and thereby enhancing the reliability and stability of the compressor 6.

[0052] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the elastic member 3 is a spring, and the spring sleeve is arranged outside the stop plug 2. The upper end of the spring is connected to the shell 1, and the lower end of the spring is connected to the stop plug 2. The connection method is simple and easy to assemble. At the same time, the spring can be extended or shortened under the action of external force, and then the stop plug 2 can be allowed to move in the shell 1 in the up and down direction to achieve the state change of the shell 1. In addition, the spring has a simple structure and is easy to manufacture and has a low processing cost, which can reduce the manufacturing cost of the stop device 100.

[0053] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, in the direction from top to bottom, the cross-sectional area of ​​the stop plug 2 gradually increases. The distance between the two farthest points in the cross section of the upper end of the stop plug 2 is less than the inner diameter of the first sleeve 11, so that when the stop plug 2 moves downward, the outer surface of the upper end of the stop plug 2 is easily spaced from the inner peripheral wall of the first sleeve 11, thereby facilitating the conduction of the stop plug 2 to the shell 1. The distance between the two farthest points in the cross section of the lower end of the stop plug 2 is less than the inner diameter of the second sleeve 13 and greater than the inner diameter of the first sleeve 11, thereby enabling the stop plug 2 to be in the shell 1, and when the stop plug 2 moves upward, the outer peripheral wall of the lower end of the stop plug 2 can stop against the first connecting pipe 12 or the connection between the first connecting pipe 12 and the first sleeve 11, thereby facilitating the blocking of the shell 1 by the stop plug 2.

[0054] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the cross-sections of the first sleeve 11 and the first connecting pipe 12 are circular, which is more common and easy to process, and also facilitates the connection of the first connecting pipe 12 with the first sleeve 11 and the second sleeve 13. The stop plug 2 is conical or truncated cone-shaped, with a simple structure and easy processing. The cross-section of the stop plug 2 is also circular, which is more compatible with the cross-sectional shape of the first sleeve 11 and the first connecting pipe 12. When the outer peripheral wall of the stop plug 2 abuts against the first connecting pipe 12 or the connection between the first connecting pipe 12 and the first sleeve 11, the abutment can fit more closely, which is conducive to ensuring the blocking effect of the stop plug 2 on the shell 1, and further preventing the lubricating oil in the compressor 6 from being pressed into the gas-liquid separator 200 through the return air pipe 5, and ensuring the reliability and stability of the compressor 6 and the gas-liquid separator 200.

[0055] In some embodiments of the present invention, Figure 2 As shown, combined Figure 3 and Figure 4The shell 1 also includes a third sleeve 15 and a second connecting pipe 14. The third sleeve 15 is located below the second sleeve 13. One end of the second connecting pipe 14 is connected to the second sleeve 13, and the other end is connected to the third sleeve 15. The inner diameter of the third sleeve 15 is smaller than the inner diameter of the second sleeve 13. The second connecting pipe 14 can be a reducer. The upper and lower ends of the second connecting pipe 14 are open. The diameter of the upper opening of the second connecting pipe 14 is the same as the diameter of the second sleeve 13, and the diameter of the lower opening of the second connecting pipe 14 is the same as the diameter of the third sleeve 15, so that the second connecting pipe 14 can be connected to the second sleeve 13 and the third sleeve 15 respectively. Of course, the second connecting pipe 14 can also be an annular plate structure perpendicular to the axis of the second sleeve 13 and the third sleeve 15. The radial inner and outer ends of the second connecting pipe 14 are used to connect the lower end of the second sleeve 13 and the upper end of the third sleeve 15 respectively. By providing the second connecting pipe 14 , the second sleeve pipe 13 and the third sleeve pipe 15 having different pipe diameters can be connected.

[0056] In addition, the third sleeve 15 is suitable for connecting with the upper end of the return air pipe 5, and the inner diameter of the third sleeve 15 is the same as the inner diameter of the return air pipe 5, so as to facilitate the connection between the lower open end of the shell 1 and the return air pipe 5. In this way, the first sleeve 11, the second sleeve 13, the third sleeve 15 and the return air pipe 5 can be connected, so that the gas in the gas-liquid separator 200 can enter the return air pipe 5 through the first sleeve 11, the second sleeve 13 and the third sleeve 15 in sequence, without affecting the gas flow between the gas-liquid separator 200 and the compressor 6, and can meet the normal return air needs of the compressor 6, thereby ensuring the normal operation and performance of the compressor 6.

[0057] In some embodiments of the present invention, Figure 2 As shown, combined Figure 3 and Figure 4 , the inner diameter of the third sleeve 15 is the same as the inner diameter of the first sleeve 11. On the one hand, the upper and lower symmetry of the shell sleeve 1 structure can be ensured, which is beneficial to the processing of the shell sleeve 1. On the other hand, the sizes of the openings at the upper and lower ends of the shell sleeve 1 can be ensured to be the same, so as to ensure that the flow rate of the gas entering and leaving the shell sleeve 1 is equal, thereby ensuring the stability of the gas flow in the shell sleeve 1. In addition, the inner diameter of the third sleeve 15 is the same as the inner diameter of the return pipe 5, which is beneficial to the gas circulation between the return pipe 5 and the shell sleeve 1, and can ensure the stability of the gas flow in the shell sleeve 1 and the return pipe 5.

[0058] The gas-liquid separator 200 for the compressor 6 according to an embodiment of the present invention is described below.

[0059] The gas-liquid separator 200 for the compressor 6 according to the embodiment of the utility model comprises: a shell 4, a return air pipe 5 and the above-mentioned cut-off device 100.

[0060] Specifically, Figure 1As shown, the upper end of the shell 4 has an air inlet, and the gas refrigerant mixed with the liquid refrigerant enters the gas-liquid separator 200 from the air inlet. The gas-liquid separator 200 is used to separate liquid and gas. The return air pipe 5 is connected to the lower end of the shell 4, and the upper end of the return air pipe 5 extends into the shell 4 from the lower end of the shell 4. The lower end of the return air pipe 5 is suitable for connecting with the return air port 61 of the compressor 6. The refrigerant enters the gas-liquid separator 200, and the gas refrigerant after gas-liquid separation in the gas-liquid separator 200 enters the compressor 6 through the return air pipe 5. When the compressor 6 is running, the gas-liquid separator 200 can prevent the liquid from entering the compressor 6 along with the gas to protect the compressor 6 from being damaged by liquid hammer, which is conducive to ensuring the normal operation of the compressor 6.

[0061] Furthermore, if Figure 1 As shown, combined Figure 3 and Figure 4 , the cut-off device 100 is arranged in the shell 4, and the cut-off device 100 includes a shell 1 and a cut-off plug 2. The shell 1 is arranged in the shell 4, and the upper and lower ends of the shell 1 are open to facilitate the circulation of gas in the shell 1. The lower end of the shell 1 is connected to the upper end of the return pipe 5. The upper end of the return pipe 5 is a free end extending into the gas-liquid separator 200, and the upper end of the return pipe 5 is connected to the lower end of the shell 1, so that the gas in the gas-liquid separator 200 can enter the shell 1 and the return pipe 5 through the upper open end of the shell 1, and enter the compressor 6 through the return pipe 5. While realizing the connection and fixation of the shell 1, it does not affect the circulation of the gas, and can meet the normal return air needs of the compressor 6.

[0062] In addition, if Figure 3 and Figure 4 As shown, the stop plug 2 is arranged in the shell 1 for conducting or blocking the shell 1. When the compressor 6 operates normally, the stop plug 2 conducts the shell 1, and the gas can enter the shell 1 and the return pipe 5 from the upper end opening of the shell 1, and enter the compressor 6 through the return pipe 5, which can meet the normal return air demand of the compressor 6 and ensure the normal operation and performance of the compressor 6. When the compressor 6 is shut down and stops running, the stop plug 2 blocks the shell 1, and the gas or liquid cannot enter the shell 4 of the gas-liquid separator 200 through the shell 1, which can effectively prevent the lubricating oil in the compressor 6 from being pressed into the return pipe 5 and entering the gas-liquid separator 200 under the action of the pressure difference, ensuring the performance and stability of the gas-liquid separator 200, thereby extending the service life of the gas-liquid separator 200. On the other hand, it can also prevent the lubricating oil level in the compressor 6 from being lower than the specified minimum oil level, resulting in the compressor 6 being unable to start normally again, reducing the risk of abnormal operation, and thereby enhancing the reliability and stability of the compressor 6.

[0063] According to the gas-liquid separator 200 for the compressor 6 according to the embodiment of the utility model, by connecting the shell casing 1 at the upper end of the return air pipe 5 and setting the shut-off plug 2 arranged in the shell casing 1 to be able to conduct or block the shell casing 1, when the compressor 6 is operating normally, the shut-off plug 2 can be connected to the shell casing 1 to meet the normal return air demand of the compressor 6, thereby ensuring the normal operation and performance of the compressor 6. At the same time, when the compressor 6 is shut down and stops running, the shut-off plug 2 can block the shell casing 1, thereby effectively preventing the lubricating oil in the compressor 6 from being pressed into the return air pipe 5 and entering the gas-liquid separator 200 under the action of the pressure difference, thereby ensuring the reliability, stability and service life of the gas-liquid separator 200.

[0064] The compressor assembly 300 according to an embodiment of the present invention is described below.

[0065] The compressor assembly 300 according to the embodiment of the present invention comprises: a compressor 6 and the above-mentioned gas-liquid separator 200 for the compressor 6 .

[0066] Specifically, Figure 1 As shown, the gas-liquid separator 200 includes a shell 4 and a return pipe 5, which is used to separate liquid and gas. The return pipe 5 is connected to the lower end of the shell 4, and the upper end of the return pipe 5 extends from the lower end of the shell 4 into the shell 4. The compressor 6 has a return port 61, and the lower end of the return pipe 5 is connected to the return port 61. The gas refrigerant mixed with the liquid refrigerant enters the gas-liquid separator 200 from the air inlet on the shell 4, and the gas refrigerant after gas-liquid separation by the gas-liquid separator 200 enters the compressor 6 through the return pipe 5. When the compressor 6 is running, the gas-liquid separator 200 can prevent the liquid from entering the compressor 6 along with the gas to protect the compressor 6 from being damaged by liquid hammer, which is conducive to ensuring the normal operation of the compressor 6.

[0067] Furthermore, if Figure 1 As shown, combined Figure 3 and Figure 4 , the cut-off device 100 is arranged in the shell 4, and the cut-off device 100 includes a shell 1 and a cut-off plug 2. The shell 1 is arranged in the shell 4, and the upper and lower ends of the shell 1 are open to facilitate the circulation of gas in the shell 1. The lower end of the shell 1 is connected to the upper end of the return pipe 5. The upper end of the return pipe 5 is a free end extending into the gas-liquid separator 200, and the upper end of the return pipe 5 is connected to the lower end of the shell 1, so that the gas in the gas-liquid separator 200 can enter the shell 1 and the return pipe 5 through the upper open end of the shell 1, and enter the compressor 6 through the return pipe 5. While realizing the connection and fixation of the shell 1, it does not affect the circulation of the gas, and can meet the normal return air needs of the compressor 6.

[0068] In addition, if Figure 3 and Figure 4As shown, the stop plug 2 is arranged in the shell 1 for conducting or blocking the shell 1. When the compressor 6 operates normally, the stop plug 2 conducts the shell 1, and the gas can enter the shell 1 and the return pipe 5 from the upper end opening of the shell 1, and enter the compressor 6 through the return pipe 5, which can meet the normal return air demand of the compressor 6 and ensure the normal operation and performance of the compressor 6. When the compressor 6 is shut down and stops running, the stop plug 2 blocks the shell 1, and the gas or liquid enters the shell 4 of the gas-liquid separator 200 through the shell 1, which can effectively prevent the lubricating oil in the compressor 6 from being pressed into the return pipe 5 and entering the gas-liquid separator 200 under the action of the pressure difference, ensuring the performance and stability of the gas-liquid separator 200, thereby extending the service life of the gas-liquid separator 200. On the other hand, it can also prevent the lubricating oil level in the compressor 6 from being lower than the specified minimum oil level, resulting in the compressor 6 being unable to start normally again, reducing the risk of abnormal operation, and thereby enhancing the reliability and stability of the compressor 6.

[0069] According to the compressor assembly 300 of the embodiment of the utility model, by connecting the shell sleeve 1 at the upper end of the return air pipe 5 of the gas-liquid separator 200 and setting the shut-off plug 2 in the shell sleeve 1 to be able to conduct or block the shell sleeve 1, when the compressor 6 is operating normally, the shut-off plug 2 can be connected to the shell sleeve 1 to meet the normal return air demand of the compressor 6, thereby ensuring the normal operation and performance of the compressor 6. At the same time, when the compressor 6 is shut down and stops operating, the shut-off plug 2 can block the shell sleeve 1, thereby effectively preventing the lubricating oil in the compressor 6 from being pressed into the return air pipe 5 and entering the gas-liquid separator 200 under the action of the pressure difference, thereby ensuring the performance and service life of the gas-liquid separator 200, and ensuring that the compressor 6 can be started normally again, thereby enhancing the reliability and stability of the compressor 6, and thereby enhancing the reliability and service life of the compressor assembly 300.

[0070] In some embodiments of the utility model, there is one return air port 61, one return air pipe 5, and one cut-off device 100. In this case, the compressor 6 can be a single-cylinder compressor 6. The compressor 6 has one cylinder, and the cylinder has one compression chamber. The air inlet of the compression chamber is connected to the return air port 61. One cut-off device 100 can control the conduction or blocking of the pipeline formed by the return air port 61 of the compressor 6 and the return air pipe 5. Of course, the compressor 6 can also be a double-cylinder compressor 6. The compressor 6 has two cylinders, and the two cylinders are a primary cylinder and a secondary cylinder respectively. The primary cylinder has a primary compression chamber, and the secondary cylinder has a secondary compression chamber. The air inlet of the secondary compression chamber is connected to the air outlet of the primary compression chamber, and the air inlet of the primary compression chamber is connected to the return air port 61. The return air port 61 of the compressor 6 is connected to the return air pipe 5. The conduction or blocking of the above-mentioned connecting pipeline can be controlled by a cut-off device 100.

[0071] Of course, the present invention is not limited to this. Figure 1As shown, there are two return air ports 61 spaced apart, there are two return air pipes 5 corresponding to the two return air ports 61, and there are two cut-off devices 100 corresponding to the two return air pipes 5. The compressor 6 can be a two-cylinder compressor 6, the compressor 6 has two cylinders, the two cylinders are a primary cylinder and a secondary cylinder, the primary cylinder has a primary compression chamber, the secondary cylinder has a secondary compression chamber, the air inlet of the secondary compression chamber and the air inlet of the primary compression chamber are respectively connected to the two return air ports 61, and the two cut-off devices 100 need to respectively control the conduction or blocking of the two pipelines formed by the two return air ports 61 of the compressor 6 and the corresponding two return air pipes 5. In a specific embodiment, the type of compressor 6 can be selected or adjusted according to the actual situation, thereby enhancing the adaptability of the compressor assembly 300.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cut-off device for a gas-liquid separator of a compressor, characterized in that: The gas-liquid separator comprises a gas return pipe, and the cut-off device comprises: A shell, wherein the upper and lower ends of the shell are open, and the lower end of the shell is suitable for connecting with the upper end of the return air pipe; A stop plug is disposed in the shell and is used for conducting or blocking the shell.

2. The cut-off device according to claim 1, characterized in that: In the direction from top to bottom, the shell includes a first sleeve, a first connecting pipe and a second sleeve connected in sequence, the inner diameter of the first sleeve is smaller than the inner diameter of the second sleeve, and the second sleeve is suitable for connecting with the upper end of the return air pipe and communicating with the return air pipe; The stop plug is movably arranged in the shell sleeve along the up and down directions. When the stop plug is connected to the shell sleeve, the outer surface of the stop plug is spaced apart from the inner circumferential wall of the shell sleeve. When the stop plug blocks the shell sleeve, the outer circumferential wall of the stop plug stops at the first connecting pipe or the connection between the first connecting pipe and the first sleeve.

3. The cut-off device according to claim 1, characterized in that: The cut-off device also includes: An elastic member is arranged in the shell and connected to the stop plug.

4. The cut-off device according to claim 3, characterized in that: The elastic member is a spring, and the spring is sleeved outside the stop plug.

5. The cut-off device according to claim 2, characterized in that: In a direction from top to bottom, the cross-sectional area of ​​the stopper gradually increases.

6. The cut-off device according to claim 5, characterized in that: The cross sections of the first sleeve and the first connecting pipe are circular, and the stop plug is conical or truncated cone-shaped.

7. The cut-off device according to claim 2, characterized in that: The shell also includes a third sleeve and a second connecting pipe, the third sleeve is located below the second sleeve, one end of the second connecting pipe is connected to the second sleeve, and the other end is connected to the third sleeve, the inner diameter of the third sleeve is smaller than the inner diameter of the second sleeve, and the third sleeve is suitable for connecting to the upper end of the return air pipe.

8. A gas-liquid separator for a compressor, characterized in that: include: A housing, wherein the upper end of the housing has an air inlet; an air return pipe, the upper end of which extends from the lower end of the shell into the shell; According to the cut-off device according to any one of claims 1 to 7, the shell sleeve is arranged in the shell body, and the lower end of the shell sleeve is connected to the upper end of the return air pipe.

9. A compressor assembly, characterized in that: include: A compressor having an air return port; According to the gas-liquid separator for a compressor according to claim 8, the lower end of the return air pipe is connected to the return air port.

10. The compressor assembly according to claim 9, characterized in that There is one air return port, one air return pipe, and one cut-off device; Alternatively, the number of the air return ports is two and is spaced apart from each other, the number of the air return pipes is two and corresponds to the two air return ports, and the number of the cutoff devices is two and corresponds to the two air return pipes.

Images