Scroll compressor with two-stage oil separation assembly

Abstract

The utility model relates to the field of scroll compressor, concretely is a kind of built-in two-stage oil separation component, for scroll compressor, the scroll compressor includes first exhaust port, including exhaust chamber, primary separation unit and secondary separation unit, the primary separation unit inside is barrel, and the secondary separation unit inside is barrel with smaller open end;The open end inner diameter of primary separation unit is less than the inner diameter of secondary separation unit bottom end, and the open end of primary separation unit and the open end of secondary separation unit are communicated.The utility model forms the flow rate of gas greater than the flow rate of tiny oil droplet by primary separation unit, forms the flow rate of gas less than the flow rate of tiny oil droplet by secondary separation unit, and oil-gas mixed gas is separated continuously two times, greatly improves oil-gas separation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of scroll compressor technology, and in particular to a scroll compressor with a built-in two-stage oil separator assembly. Background Technology

[0002] A conventional helium compressor includes a housing, motor, transmission components, support components, and a compression component. The compression component consists of a moving scroll plate and a stationary scroll plate. In the compression and transmission of special gases such as helium, the high temperatures generated during compression make it easier for impurities such as lubricating oil and moisture to dissolve in the compressed gas. In cryogenic pump systems, if the oil mist generated during compression is not effectively removed, it may solidify at low temperatures, forming solid particles. These solid particles can not only clog pipes but also potentially damage critical equipment such as the pump body.

[0003] To address this challenge, existing technologies typically employ additional filtration devices to purify the compressed helium. However, these filters require regular replacement and maintenance, increasing compressor operating costs and adding an extra burden to routine maintenance. Furthermore, patent number CN202411571571.0 proposes an oil-gas separation assembly and a scroll compressor, which features an exhaust pipe positioned in the exhaust direction. Utilizing the collision of gas with the exhaust pipe during discharge, and the rotational flow generated on the outer wall of the exhaust pipe, centrifugal force effectively separates the oil and gas. However, this approach also reveals some potential limitations in practical applications.

[0004] Specifically, during the exhaust process, the gas mixture initially rotates around the exhaust pipe and moves in a certain direction (e.g., the opposite direction of S1). However, to re-enter the exhaust pipe, the gas mixture needs to change direction again, moving in the opposite direction (forward of S1). During this process, the direction of the gas mixture changes by 180 degrees. This significant change in direction not only causes mutual interference between the gases but may also create turbulence, severely affecting the trajectory of the gas mixture around the exhaust pipe. The generation of turbulence weakens the centrifugal force's separation effect on the oil and gas, thus reducing the effectiveness of oil-gas separation.

[0005] Therefore, how to improve the oil-gas separation efficiency of compressors and ensure the purity of special gases and the smooth progress of subsequent applications has become an important problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a scroll compressor with a built-in two-stage oil separator to solve the problem of low oil-gas separation efficiency in existing technologies, which affects the purity of special gases and the smooth operation of subsequent applications.

[0007] The technical solution of this utility model is: a built-in two-stage oil separator assembly for a scroll compressor. The scroll compressor includes a first exhaust port, an exhaust chamber, a primary separation unit, and a secondary separation unit. The primary separation unit is internally barrel-shaped, and the secondary separation unit is internally barrel-shaped with a smaller opening at one end. The inner diameter of the opening at the primary separation unit is smaller than the inner diameter of the bottom end of the secondary separation unit, and the opening at the primary separation unit is connected to the opening at the secondary separation unit.

[0008] One end of the exhaust chamber is connected to the first exhaust port, and the other end is connected to the primary separation unit. The exhaust direction of the exhaust chamber is tangent to the inner wall of the primary separation unit. The bottom end of the secondary separation unit is provided with a second exhaust port and a first drain port.

[0009] Preferably, the primary separation unit is provided with a guide core, one end of which is connected to the bottom end of the primary separation unit and together with the guide core forms a first oil separation chamber. The cross-sectional area of ​​the first oil separation chamber gradually decreases as it approaches the connection with the secondary separation unit. A second oil separation chamber is formed inside the secondary separation unit. The first and second oil separation chambers are connected, and the cross-sectional area of ​​the second oil separation chamber gradually increases as it moves away from the connection with the primary separation unit.

[0010] Preferably, the cross-sections of the guide core and the first oil distribution chamber are both circular and concentric.

[0011] Preferably, the opening end and the bottom end of the primary separation unit have the same diameter, and the guide core is cylindrical.

[0012] Preferably, the diameter of the opening end of the primary separation unit is smaller than the diameter of the bottom end, the guide core is conical, and the smaller end is closer to the secondary separation unit; the cross-sectional area of ​​the first oil separator gradually decreases in the direction close to the second oil separator.

[0013] Preferably, the opening end and the bottom end of the primary separation unit have the same diameter, and the guide core is frustum-shaped; the smaller end of the guide core is connected to the bottom end of the primary separation unit, and the cross-sectional area of ​​the first oil separation chamber gradually decreases in the direction close to the second oil separation chamber.

[0014] Preferably, the angle between the straight line containing the central axis of the primary separation unit and the horizontal plane is greater than 0°; the primary separation unit is provided with a second drain port, which is located at the lower end of the primary separation unit in the vertical direction.

[0015] Preferably, the second exhaust port is located at the upper end of the bottom of the secondary separation unit, and the first drain port is located at the lower end of the bottom of the secondary separation unit.

[0016] Preferably, the scroll compressor includes a housing and a stationary scroll plate disposed inside the housing, the first exhaust port is disposed on the stationary scroll plate, and the oil separator assembly is disposed inside the housing and connected to the stationary scroll plate.

[0017] A scroll compressor includes the aforementioned built-in two-stage oil separator assembly.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] (1) By setting up a primary separation unit and a secondary separation unit, this utility model uses the difference in centrifugal force in the primary separation unit to separate the gas and oil in the secondary separation unit, based on the difference in inertia of the gas and oil in the mixed gas, and uses the difference in flow rate to separate the gas and oil in the secondary separation unit. After two consecutive effective separations, the efficiency of oil-gas separation is greatly improved.

[0020] (2) In the primary separation unit, the mixed gas enters tangentially and rotates around the guide core to accelerate, which can reduce the generation of eddies, increase the stability of the mixed gas flow in the primary separation unit, and thus enhance the separation effect.

[0021] At the instant the mixed gas enters the secondary separation unit, the flow area increases dramatically, causing the gas velocity to suddenly decelerate. Due to the relatively large inertia of the tiny oil droplets and the relatively small inertia of the gas, the velocity difference between the tiny oil droplets and the gas further increases, promoting the separation of oil and gas. At the same time, the collision between the mixed gas and the inner wall of the secondary separation unit further promotes the separation of gas and oil. By utilizing the principles of velocity change and inertial difference, efficient separation of oil-gas mixtures is achieved.

[0022] (3) The oil separator has a small overall volume and can be installed inside the compressor. It is simple to manufacture and does not require frequent maintenance and replacement, which can effectively control production costs.

[0023] In the application of special gases such as helium, the oil content in the discharged gas is greatly reduced by two consecutive oil-liquid separation processes. This reduces the number of filter devices required in subsequent processes and eliminates the need for frequent maintenance of the filter devices, thus significantly reducing production costs. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Figure 1 This is a schematic diagram of the built-in two-stage oil separator assembly of this utility model;

[0026] Figure 2 This is a top view of the built-in two-stage oil separator assembly of this utility model.

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0028] Figure 4 This is a schematic diagram of the oil separator component in Embodiment 1 of this utility model;

[0029] Figure 5 This is a schematic diagram of the oil separation component in Embodiment 2 of this utility model;

[0030] Figure 6 This is a schematic diagram of the oil separation component in Embodiment 3 of this utility model;

[0031] Figure 7 This is a schematic diagram of the oil separation component in Embodiment 4 of this utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the scroll compressor with built-in two-stage oil separator of this utility model.

[0033] Wherein: exhaust chamber 1;

[0034] Primary separation unit 2, first oil separation chamber 2a, guide core 21, second drain port 22;

[0035] Secondary separation unit 3, second oil separation chamber 3a, second exhaust port 31, first drain port 32;

[0036] Static vortex disk 4, first exhaust port 41;

[0037] 5. Shell. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to specific embodiments:

[0039] like Figures 1-8 As shown, the oil separator component in this invention is applied to a scroll compressor. It is small in size and installed inside the compressor, effectively separating oil from compressed gas. The separated gas is discharged, and the oil re-enters the compressor's circulation, increasing the compressor's reliability and avoiding the need for excessive or redundant filtration devices in subsequent gas transmission, thus reducing maintenance costs. In the primary separation unit, the mixed gas enters tangentially and rotates around the guide core, accelerating and separating the oil and gas through centrifugal force. In the secondary separation unit, the flow area increases dramatically, and the flow rate of the mixed gas suddenly decelerates. Utilizing the principles of velocity change and inertia difference, the oil and gas separate due to their different inertia, completing the second gas-oil separation.

[0040] Specifically:

[0041] A built-in two-stage oil separator assembly includes an exhaust chamber 1, a primary separation unit 2, and a secondary separation unit 3. The detailed structure is described in the following embodiments. Furthermore, for ease of description in the embodiments, it is referred to as... Figure 4-7 The left-right direction shown can be understood as the primary separation unit 2 being to the left of the secondary separation unit 3; the up-down direction is defined in vertical scroll compressors, meaning the oil separator assembly is installed at the upper end of the stationary scroll plate 4. Of course, in other embodiments, the up, down, left, and right directions are adjusted according to the actual setup; furthermore, the central axes of the primary separation unit 2 and the secondary separation unit 3 are not limited to the horizontal or vertical direction, but can form a certain angle with either direction. For example, in a horizontal compressor, the oil separator assembly is connected to the side of the stationary scroll plate 4, and the primary separation unit 2 and the secondary separation unit 3 can also be vertically arranged.

[0042] Example 1

[0043] like Figure 4 As shown, the primary separation unit 2 has a barrel-shaped interior with the same diameter at both the opening and bottom ends, while the secondary separation unit 3 has a barrel-shaped interior with a smaller diameter at the opening end than at the bottom end. The inner diameter of the opening end of the primary separation unit 2 is smaller than the inner diameter of the bottom end of the secondary separation unit 3, and the opening end of the primary separation unit 2 is connected to the opening end of the secondary separation unit 3.

[0044] One end of the exhaust chamber 1 completely covers and communicates with the first exhaust port 41, while the other end is connected to the primary separation unit 2. The exhaust direction of the exhaust chamber 1 is tangent to the inner wall of the primary separation unit 2.

[0045] The secondary separation unit 3 is provided with a second exhaust port 31 and a first drain port 32 at its bottom end. The second exhaust port 31 is located above the first drain port 32, so that after the oil and gas are separated, the gas flows upward through the second exhaust port 31, and the oil flows downward through the first drain port 32.

[0046] In this embodiment, during exhaust, the mixed gas compressed by the compressor enters the primary separation unit 2 tangentially through the first exhaust port 41 and the exhaust chamber 1, and rotates and flows around the inner wall of the primary separation unit 2. During this process, because the inertial centrifugal force of the oil is large, the distance it rotates and flows around the inner wall of the primary separation unit 2 is long, while the inertial centrifugal force of the gas is small, and the distance it rotates and flows around is short, thus separating the gas and liquid, which then enter the secondary separation unit 3.

[0047] When the mixed gas enters the secondary separation unit 3, the flow area suddenly increases, causing the flow rate of the mixed gas to decrease rapidly. The oil has greater inertia while the gas has less inertia, which again promotes the separation of oil and gas.

[0048] The primary separation unit 2 and secondary separation unit 3 respectively complete the first and second separations of oil and gas. Through two-stage separation, the oil content in the gas is greatly reduced, minimizing the processing steps required for subsequent gas transmission and thus lowering production and maintenance costs.

[0049] Example 2

[0050] like Figure 5 As shown, based on the structure of Embodiment 1, a guide core 21 is provided inside the primary separation unit 2, and a first oil separation chamber 2a is formed between the guide core 21 and the inner wall of the primary separation unit 2. A second oil separation chamber 3a is formed inside the secondary separation unit 3. The guide core 21 is cylindrical, and the center of the circle formed by the cross-section of the guide core 21 is concentric with the center of the circle formed by the cross-section of the primary separation unit 2. The cross-sectional area of ​​the first oil separation chamber 2a remains unchanged in the direction approaching the secondary separation unit 3, meaning that the flow area remains constant when compressed gas is transmitted within the first oil separation chamber 2a.

[0051] In this embodiment, the guide core 21 serves to regulate and guide the flow. When the gas from the exhaust chamber 1 enters the primary separation unit 2 tangentially, it allows the compressed gas to undergo a more stable rotating flow around the inner wall of the primary separation unit 2, avoiding turbulence and resulting in higher separation efficiency of the mixed gas in the primary separation unit 2. Furthermore, when the compressor is operating at low speed and the compressed gas exhaust velocity is low, the guide core 21 can increase the mixed gas flow rate, thereby increasing the oil-gas separation efficiency.

[0052] Example 3

[0053] like Figure 6 As shown, based on the structure of Embodiment 1, a guide core 21 is provided inside the primary separation unit 2, forming a first oil separation chamber 2a between the guide core 21 and the inner wall of the primary separation unit 2. The guide core 21 is conical, with the smaller end of the cone closer to the secondary separation unit 3. The primary separation unit 2 is configured as a barrel shape with the diameter of the open end smaller than the diameter of the bottom end, and the open end is connected to the secondary separation unit 3. In this embodiment, the distance between the inner wall of the primary separation unit 2 and the guide core 21 is always the same, i.e., the first oil separation chamber 2a is a hollow frustum shape. Therefore, the cross-sectional area of ​​the first oil separation chamber 2a near the connection with the secondary separation unit 3 gradually decreases, meaning that when compressed gas flows in the first oil separation chamber 2a, the flow area gradually decreases, and the flow velocity increases.

[0054] During exhaust, the compressed gas mixture enters the first oil separator chamber 2a tangentially from the first exhaust port 41 through the exhaust chamber 1. Guided by the guide core 21, the gas mixture rotates and flows around it; simultaneously, the reduced flow area causes the flow velocity to gradually increase. During this process, the centrifugal force gradually increases, promoting the separation of gas and oil. This embodiment is more suitable for oil-gas separation in low-speed compressors. Low-speed compressors discharge compressed gas at relatively low velocity, resulting in smaller differences in centrifugal force during rotational flow and poorer oil-gas separation. The conical shape of the guide core 21 and the reduced flow area can quickly increase the flow velocity, thereby increasing the oil-gas separation efficiency.

[0055] Example 4

[0056] Based on the structure of Embodiment 1, such as Figure 7 As shown, the guide core 21 is shaped like a frustum, with the larger end of the frustum closer to the secondary separation unit 3; the primary separation unit 2 is a barrel shape with the same diameter at both the open and bottom ends. In the direction closer to the secondary separation unit, the inner diameter of the primary separation unit 2 remains constant, while the inner diameter of the guide core 21 gradually increases, meaning the distance between the guide core 21 and the primary separation unit 2 gradually decreases. During compressed flow, the flow area gradually decreases, and the flow velocity increases.

[0057] In this embodiment, as the mixed gas is transported within the first oil separator chamber 2a, its speed increases, leading to a gradual increase in centrifugal force and promoting the separation of oil and gas in the mixed gas. This embodiment is also more suitable for oil-gas separation in low-speed compressors. Low-speed compressors discharge compressed gas at relatively low velocity, resulting in smaller differences in centrifugal force during rotational flow and poorer oil-gas separation. The conical shape of the guide core 21 and the reduced flow area can rapidly increase the flow velocity, thereby increasing the oil-gas separation efficiency.

[0058] Similarly, when the mixed gas enters the second oil separator chamber 3a, the flow area increases, the flow velocity of the mixed gas decreases, and the oil has greater inertia than the gas, which promotes the separation of oil and gas. In addition, when the mixed gas enters the second oil separator chamber 3a, it has rotational inertia, causing the mixed gas to splash tangentially towards the secondary separation unit 3 and collide with the inner wall of the secondary separation unit 3, further promoting the separation of oil and gas.

[0059] It should be noted that the above embodiments 1-4 are preferred embodiments of this utility model and can represent the technical concept and features of this utility model. However, it is obvious that this utility model is not limited to the details of the above two embodiments. For example, in other embodiments, the interior of the secondary separation unit 3 is set to other shapes, or devices such as baffles, filters, or conical structures are provided in the secondary separation unit 3, so that the mixed gas entering the second oil separation chamber 3a collides with the baffles or is filtered by the filter, thereby improving the separation efficiency of oil and gas.

[0060] This utility model also provides a scroll compressor including a housing 5 and a stationary scroll plate 4 disposed inside the housing 5. A first exhaust port 41 is disposed on the stationary scroll plate 4, and the aforementioned oil separator assembly is disposed inside the housing 5 and sealed to the stationary scroll plate 4. The compressed gas from the compressor is discharged into the oil separator assembly through the first exhaust port 41. In the oil separator assembly, after two separations by the primary separation unit 2 and the secondary separation unit 3, the separated oil is discharged into the housing 5 through the first drain port 32 and the second drain port 22, and then flows back to the compressor's oil sump for continued recycling. The separated gas is discharged into the housing 5 through the second exhaust port 31 and is discharged through a corresponding discharge channel provided on the housing 5.

[0061] It should be noted that the two-stage oil separator assembly in this invention is not only applicable to scroll compressors, but also suitable for production fields requiring gas-liquid separation. Furthermore, the two-stage oil separator assembly has a simple structure, small size, and can be integrally molded or welded. When connected to the compressor, it can be directly welded or fastened with bolts or other fasteners. This results in lower manufacturing and connection costs. Moreover, during installation, no additional or complex modifications to the mechanical structure of the installation equipment are required, thus incurring no additional costs.

[0062] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A built-in two-stage oil separator assembly for a scroll compressor, the scroll compressor including a first discharge port, characterized in that: It includes an exhaust chamber, a primary separation unit, and a secondary separation unit. The primary separation unit is cylindrical inside, and the secondary separation unit is cylindrical. The internal diameter of the secondary separation unit decreases as it approaches the opening end. The inner diameter of the opening end of the primary separation unit is smaller than the inner diameter of the bottom end of the secondary separation unit, and the opening end of the primary separation unit is connected to the opening end of the secondary separation unit. One end of the exhaust chamber is connected to the first exhaust port, and the other end is connected to the primary separation unit. The exhaust direction of the exhaust chamber is tangent to the inner wall of the primary separation unit. The bottom end of the secondary separation unit is provided with a second exhaust port and a first drain port.

2. The built-in two-stage oil separator component according to claim 1, characterized in that: The primary separation unit is provided with a flow guide core. One end of the flow guide core is connected to the bottom end of the primary separation unit and together with the flow guide core, they form a first oil separation chamber. The cross-sectional area of ​​the first oil separation chamber gradually decreases as it approaches the connection with the secondary separation unit. A second oil separation chamber is formed inside the secondary separation unit. The first oil separation chamber and the second oil separation chamber are connected. The cross-sectional area of ​​the second oil separation chamber gradually increases as it moves away from the connection with the primary separation unit.

3. The built-in two-stage oil separator component according to claim 2, characterized in that: The cross-sections of the guide core and the first oil separator are both circular and concentric.

4. The built-in two-stage oil separator component according to claim 3, characterized in that: The opening and bottom of the primary separation unit have the same diameter, and the guide core is cylindrical.

5. A built-in two-stage oil separator component according to claim 3, characterized in that: The diameter of the opening end of the primary separation unit is smaller than the diameter of the bottom end. The guide core is conical, and the end of the guide core with a smaller cross-sectional diameter is closer to the secondary separation unit. The cross-sectional area of ​​the first oil separator gradually decreases in the direction closer to the second oil separator.

6. A built-in two-stage oil separator component according to claim 3, characterized in that: The opening and bottom of the primary separation unit have the same diameter, and the guide core is frustum-shaped. The end of the guide core with the smaller cross-sectional diameter is connected to the bottom of the primary separation unit, and the cross-sectional area of ​​the first oil separator gradually decreases in the direction close to the second oil separator.

7. A built-in two-stage oil separator component according to claim 3, characterized in that: The angle between the central axis of the primary separation unit and the horizontal plane is greater than 0°; the primary separation unit is provided with a second drain port, which is located at the lower end of the primary separation unit in the vertical direction.

8. A built-in two-stage oil separator component according to claim 1, characterized in that: The second exhaust port is located at the upper end of the bottom of the secondary separation unit, and the first drain port is located at the lower end of the bottom of the secondary separation unit.

9. A built-in two-stage oil separator component according to claim 1, characterized in that: The scroll compressor includes a housing and a stationary scroll plate disposed inside the housing. The first exhaust port is disposed on the stationary scroll plate, and the oil separator assembly is disposed inside the housing and connected to the stationary scroll plate.

10. A scroll compressor, characterized in that: Includes the built-in two-stage oil separator assembly as described in any one of claims 1-9.

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