Efficient oil separation structure for scroll compressor

Abstract

The invention discloses an efficient oil separation structure for a scroll compressor, and relates to the technical field of compressors, the efficient oil separation structure comprises a shell and an oil separation pipeline, a first expansion cavity is formed in the shell, a second expansion cavity is formed in the upper side of the first expansion cavity, an oil storage cavity is formed in the lower side of the first expansion cavity, and one end of the oil separation pipeline extends into the oil storage cavity; the other end of the oil branch pipeline penetrates through the shell, the first expansion cavity communicates with the second expansion cavity and the oil storage cavity, the second expansion cavity communicates with the oil storage cavity, and the oil branch pipeline communicates with the oil storage cavity and the second expansion cavity. According to the cyclone type oil separator, through the arrangement of the first expansion cavity, the second expansion cavity and the oil separation pipeline, the three-stage oil-gas separation process is achieved, and compared with a traditional single cyclone type oil separator, oil liquid in oil gas can be more sufficiently separated.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a high-efficiency oil separation structure used in a scroll compressor. Background Art

[0002] As a core component in a refrigeration system, the performance of a scroll compressor directly impacts the efficiency and stability of the entire system. The oil separation design within the exhaust chamber is crucial during the operation of a scroll compressor.

[0003] At present, the conventional design of the oil separation in the exhaust chamber of a scroll compressor is to integrate a cyclone oil separator with the exhaust pipe. In this design, after the gaseous refrigerant containing oil and liquid enters the cyclone oil separator, centrifugal force is used to separate the oil and liquid from the gaseous refrigerant. The separated gaseous refrigerant is discharged directly from the exhaust pipe, while the liquid oil flows out from below. However, under normal circumstances, the cyclone oil separator has a high oil separation efficiency only within a certain speed range. When the speed of the scroll compressor is too low, the gas flow rate slows down and the centrifugal force is insufficient, making it difficult to fully separate the oil and liquid. As a result, the discharged gaseous refrigerant still contains a lot of oil, which cannot meet the oil return requirements, thereby affecting the lubrication and normal operation of the compressor. On the other hand, when the compressor speed is too high, although the gas flow rate increases, the movement state of the oil droplets in the high-speed airflow becomes complicated, and some oil droplets may not be separated in time and are carried out, which also leads to a decrease in oil separation efficiency. Summary of the Invention

[0004] The object of the present invention is to provide a high-efficiency oil separation structure used in a scroll compressor to solve the above-mentioned technical problems.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A high-efficiency oil separation structure used in a scroll compressor includes an outer shell and an oil separation pipeline. A first expansion chamber is provided inside the shell, a second expansion chamber is provided on the upper side of the first expansion chamber, and an oil storage chamber is provided on the lower side of the first expansion chamber. One end of the oil separation pipeline extends into the oil storage chamber, and the other end of the oil separation pipeline passes through the outer shell. The first expansion chamber is connected to the second expansion chamber and the oil storage chamber, the second expansion chamber is connected to the oil storage chamber, and the oil separation pipeline is connected to the oil storage chamber and the second expansion chamber.

[0007] Preferably, an upper isolation wall is further included, and the upper isolation wall is provided between the first expansion chamber and the second expansion chamber.

[0008] Preferably, a lower isolation wall is further included, and the lower isolation wall is provided between the first expansion chamber and the oil storage chamber.

[0009] As a further preference, a first capillary flow channel is provided at one end of the lower isolation wall, and a second capillary flow channel is provided at the other end of the lower isolation wall, and the first capillary flow channel and the second capillary flow channel are connected to the first expansion chamber and the oil storage chamber respectively.

[0010] As a further preference, the upper isolation wall is composed of several sections of partitions with different slopes but the same inclination direction.

[0011] As a further preference, a notch is provided at one end of the upper isolation wall, and a third capillary channel is provided at the other end of the upper isolation wall, the notch connects the first expansion chamber and the second expansion chamber, and the third capillary channel connects the second expansion chamber and the oil storage chamber.

[0012] Preferably, a capillary hole is provided at one end of the oil distribution pipeline, and the capillary hole communicates with the oil storage cavity and the inner cavity of the oil distribution pipeline.

[0013] Preferably, a plurality of inclined holes are provided on the outer wall of the other end of the oil distribution pipeline, and the plurality of inclined holes communicate with the second expansion chamber and the inner cavity of the oil distribution pipeline.

[0014] Preferably, a compressor exhaust port is provided at the other end of the oil distribution pipeline.

[0015] Preferably, the outer shell includes a high-pressure side shell and a static vortex, the high-pressure side shell is arranged on one side of the static vortex, and the oil distribution pipeline, the first expansion chamber, the second expansion chamber and the oil storage chamber are all arranged between the high-pressure side shell and the static vortex.

[0016] The above technical solution has the following advantages or beneficial effects:

[0017] (1) In the present invention, a three-stage oil-gas separation process is achieved by setting up the first expansion chamber, the second expansion chamber and the oil separation pipeline. Compared with the traditional single cyclone oil separator, the oil liquid in the oil gas can be more fully separated.

[0018] (2) In the present invention, the setting of the first expansion chamber and the second expansion chamber effectively compensates for the problem of insufficient oil separation in the cyclone oil separator at low speed. At low speed, the expansion chamber reduces the oil and gas speed and utilizes the combined effect of gravity and centrifugal force to separate more oil and liquid. This design enables the compressor to achieve efficient oil separation at various speeds, improves the adaptability of the compressor to different working conditions, and ensures the stable operation of the refrigeration system.

[0019] (3) In the present invention, by setting up the first expansion chamber, the second expansion chamber and the oil distribution pipeline, the oil and gas of the compressor pass through two expansion chambers and one oil distribution pipeline chamber before being discharged from the exhaust port. These chambers play a role of buffering and stabilizing pressure, so that the pressure pulsation at the exhaust port of the compressor is effectively reduced; the stable exhaust pressure helps to reduce the vibration and noise during the operation of the compressor, improves the stability and comfort of the compressor operation, and is also beneficial to protecting other equipment connected to the compressor.

[0020] (4) In the present invention, the design of an independently arranged oil storage chamber and the connection between the oil storage chamber and each expansion chamber through a capillary channel greatly reduces the impact of the exhaust cyclone on the oil in the high-pressure chamber. The capillary channel uses capillary action to allow the oil to flow steadily and slowly into the oil storage chamber, avoiding oil fluctuations and instability caused by the impact of the cyclone. The stable oil level ensures that there is always sufficient lubricating oil inside the compressor, maintaining good lubrication conditions and further improving the reliability and service life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the internal structure of the high-efficiency oil separation structure used in the scroll compressor of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the internal structure of the high-efficiency oil separation structure used in the scroll compressor of the present invention. Figure 2 .

[0023] In the figure: 1. High-pressure side casing; 2. Static scroll; 11. First expansion chamber; 12. Second expansion chamber; 13. Oil storage chamber; 14. Oil distribution pipeline; 141. Inclined hole; 142. Capillary hole; 143. Compressor exhaust port; 15. Upper isolation wall; 151. Notch; 16. Lower isolation wall; 161. First capillary flow channel; 162. Second capillary flow channel; 17. Third capillary flow channel; 18. Static scroll exhaust port; 19. Oil return pipeline. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not intended to indicate or imply relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0027] Figure 1 This is a schematic diagram of the internal structure of the high-efficiency oil separation structure used in the scroll compressor of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the internal structure of the high-efficiency oil separation structure used in the scroll compressor of the present invention. Figure 2 , see Figures 1 to 2 The figure shows a high-efficiency oil separation structure for a scroll compressor, comprising a housing and an oil separation pipeline 14. A first expansion chamber 11 is provided within the housing, a second expansion chamber 12 is provided above the first expansion chamber 11, and an oil storage chamber 13 is provided below the first expansion chamber 11. One end of the oil separation pipeline 14 extends into the oil storage chamber 13, and the other end of the oil separation pipeline 14 passes through the housing. The first expansion chamber 11 communicates with the second expansion chamber 12 and the oil storage chamber 13, and the second expansion chamber 12 communicates with the oil storage chamber 13. The oil separation pipeline 14 connects the oil storage chamber 13 and the second expansion chamber 12. The housing comprises a high-pressure side housing 1 and a fixed scroll 2. The high-pressure side housing 1 is disposed on one side of the fixed scroll 2. The oil separation pipeline 14, the first expansion chamber 11, the second expansion chamber 12, and the oil storage chamber 13 are all disposed between the high-pressure side housing 1 and the fixed scroll 2. The fixed scroll 2 is provided with a fixed scroll exhaust port, which communicates with the first expansion chamber 11. In this embodiment, the design of the first expansion chamber 11 and the second expansion chamber 12 provides more space and conditions for oil-gas separation, enabling multiple separations of the oil and liquid from the oil and gas, thereby improving the oil-gas separation efficiency. An oil return line 19 is provided on the stationary scroll 2 and communicates with the oil reservoir 13, facilitating the return of oil to the low-pressure side of the compressor, thereby achieving continuous oil lubrication of the shafting.

[0028] Furthermore, as a preferred embodiment, it also includes an upper isolation wall 15, which is provided between the first expansion chamber 11 and the second expansion chamber 12. It also includes a lower isolation wall 16, which is provided between the first expansion chamber 11 and the oil storage chamber 13. A first capillary channel 161 is provided at one end of the lower isolation wall 16, and a second capillary channel 162 is provided at the other end of the lower isolation wall 16. The first capillary channel 161 and the second capillary channel 162 are connected to the first expansion chamber 11 and the oil storage chamber 13 respectively. The upper isolation wall 15 is composed of several sections of partitions with different slopes but the same inclination direction. This design helps to guide the flow of oil and gas between different expansion chambers, making the distribution of oil and gas in the chamber more uniform and improving the separation effect. In addition, a notch 151 is provided at one end of the upper isolation wall 15, and a third capillary channel 17 is provided at the other end of the upper isolation wall 15. The third capillary channel 17 is provided on the inner wall of the outer shell. For details, see Figure 1 As shown, the gap 151 connects the first expansion chamber 11 and the second expansion chamber 12, and the third capillary channel 17 connects the second expansion chamber 12 and the oil storage chamber 13, ensuring that the oil gas and oil can flow according to the designed path. The first capillary channel 161 and the second capillary channel 162 provided on the lower isolation wall 16 realize the connection between the first expansion chamber 11 and the oil storage chamber 13. The design of the capillary channel utilizes the capillary action, allowing the oil to flow into the oil storage chamber 13 more stably and slowly, avoiding oil backflow or mixing caused by excessive flow rate or pressure changes, and enhancing the stability of the oil separation process.

[0029] Furthermore, as a preferred embodiment, one end of the oil separation pipeline 14 is provided with a capillary hole 142, which connects the oil storage chamber 13 and the inner cavity of the oil separation pipeline 14, so that the separated oil can flow smoothly into the oil storage chamber 13 during the last stage of oil and gas separation. A number of inclined holes 141 are provided on the outer wall of the other end of the oil separation pipeline 14, and the several inclined holes 141 connect the second expansion chamber 12 and the inner cavity of the oil separation pipeline 14, so that the oil and gas can enter the oil separation pipeline 14 for final separation. Moreover, a compressor exhaust port 143 is provided at the other end of the oil separation pipeline 14, which simplifies the structure while ensuring that the gas refrigerant after sufficient oil separation can be smoothly discharged into the air-conditioning system. This refined design of the oil separation pipeline 14 not only improves the oil separation efficiency, but also makes the entire oil separation structure more compact and reasonable, which is conducive to the miniaturization and integration of the scroll compressor.

[0030] In this embodiment, by providing the first expansion chamber 11, the second expansion chamber 12 and the oil separation pipeline 14, the oil and gas undergo three stages of oil separation, and the oil separation effect is more sufficient; in addition, the cyclone oil and gas separation is usually less efficient at low speeds, and the addition of two stages of expansion chambers can make up for the problem of insufficient oil separation at low speeds, thereby enabling the compressor to achieve efficient oil separation at all speeds.

[0031] In this embodiment, the high-pressure cavity between the high-pressure side shell 1 and the static scroll 2 is divided into multiple chambers, and the compressor oil gas passes through two expansion chambers and an oil separation pipeline 14 inner cavity before being discharged from the exhaust port. This design effectively reduces the pressure pulsation of the compressor exhaust port 143, improving the stability of the compressor operation. In addition, the oil storage cavity 13 is independently arranged, and the oil storage cavity 13 and any expansion cavity are connected through a capillary channel, which greatly reduces the impact of exhaust gas cyclone on the oil in the high-pressure cavity, ensuring stable oil level. Under different working conditions, stable oil level helps to maintain good lubrication conditions inside the compressor and prolong the service life of the compressor.

[0032] Further, as a preferred embodiment, the other end of the oil separation pipeline 14 is provided with a compressor exhaust port 143, which ensures that the gas refrigerant after sufficient oil separation can be smoothly discharged into the air conditioning system.

[0033] The oil separation pipeline 14 in this embodiment penetrates the upper partition wall 15 and the lower partition wall 16 and is in communication with the outside of the high-pressure side shell 1, and is used to discharge the gas refrigerant into the air conditioning system. The outer wall of the oil separation pipeline 14 is sealingly fitted with the upper partition wall 15, the lower partition wall 16 and the high-pressure side shell 1.

[0034] In this embodiment, the relationship between the inner diameter d1 of the oil separation pipeline 14, the inner diameter d2 of the inclined hole 141 and the included angle a between the axis of the inclined hole 141 and the compressor axis satisfies the following relationship: [(πd1) 2 +(2d2+2) 2 ]*(sin∠a) 2 >(2d2+2) 2 .

[0035] The area relationship of the three cavities of the first expansion chamber 11 volume (V1), the second expansion chamber 12 volume (V2) and the oil storage cavity 13 volume (V3) satisfies the following relationship:

[0036] 0.8<(V1+V2) / V3<2.2

[0037] 0.8<V1 / V2<1.6

[0038] The relationship between the inner diameter d5 of the compressor exhaust port 143, the inner diameter d2 of the inclined hole 141 and the cross-sectional area S1 of the notch 151 satisfies the following relationship:

[0039] 0.6π≤4*S1*d5 2 ≤1.5π

[0040] 0.2≤d2 / d5≤0.3

[0041] During use, after the high-pressure oil and gas mixture is discharged from the exhaust port of the static scroll 2, it first enters the first expansion chamber 11 for the first oil and gas separation. During this process, due to the sudden expansion of the space, the speed of the oil and gas decreases, and part of the oil sinks due to gravity and enters the oil storage chamber 13 through the first capillary channel 161 and the second capillary channel 162 on the lower isolation wall 16. The remaining oil and gas enter the second expansion chamber 12 through the notch 151 on the upper isolation wall 15 for secondary oil and gas separation. Similarly, in the second expansion chamber 12, another part of the oil sinks and enters the oil storage chamber 13 through the third capillary channel 17. Finally, the remaining oil and gas enter the oil separation pipeline 14 cavity through the inclined hole 141 at the other end of the oil separation pipeline 14, and the oil and gas separation is carried out again. The separated oil enters the oil storage chamber 13 through the capillary hole 142, and finally the remaining gas refrigerant enters the air-conditioning system through the compressor exhaust port 143. Through this three-stage oil-gas separation process, the oil separation effect has been significantly improved compared to the traditional single cyclone oil separator, ensuring that the oil can be more fully separated at different speeds to meet the oil return requirements.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency oil separation structure for a scroll compressor, characterized in that: It includes an outer shell and an oil distribution pipeline, a first expansion chamber is provided inside the shell, a second expansion chamber is provided on the upper side of the first expansion chamber, an oil storage chamber is provided on the lower side of the first expansion chamber, one end of the oil distribution pipeline extends into the oil storage chamber, and the other end of the oil distribution pipeline passes through the outer shell, the first expansion chamber is connected to the second expansion chamber and the oil storage chamber, the second expansion chamber is connected to the oil storage chamber, and the oil distribution pipeline is connected to the oil storage chamber and the second expansion chamber.

2. The high-efficiency oil separation structure used in the scroll compressor according to claim 1, characterized in that: It also includes an upper isolation wall, which is arranged between the first expansion cavity and the second expansion cavity.

3. The high-efficiency oil separation structure used in the scroll compressor according to claim 1, characterized in that: It also includes a lower isolation wall, which is arranged between the first expansion chamber and the oil storage chamber.

4. The high-efficiency oil separation structure used in the scroll compressor according to claim 3, characterized in that: A first capillary flow channel is provided at one end of the lower isolation wall, and a second capillary flow channel is provided at the other end of the lower isolation wall. The first capillary flow channel and the second capillary flow channel are connected to the first expansion chamber and the oil storage chamber respectively.

5. The high-efficiency oil separation structure used in the scroll compressor according to claim 2, characterized in that: The upper isolation wall is composed of several sections of partitions with different slopes but the same inclination direction.

6. The high-efficiency oil separation structure used in the scroll compressor according to claim 2, characterized in that: A notch is provided at one end of the upper isolation wall, and a third capillary channel is provided at the other end of the upper isolation wall. The notch connects the first expansion chamber and the second expansion chamber, and the third capillary channel connects the second expansion chamber and the oil storage chamber.

7. The high-efficiency oil separation structure for the scroll compressor according to claim 1, characterized in that: One end of the oil distribution pipeline is provided with a capillary hole, and the capillary hole communicates with the oil storage cavity and the inner cavity of the oil distribution pipeline.

8. The high-efficiency oil separation structure for the scroll compressor according to claim 1, characterized in that: A plurality of inclined holes are provided on the outer wall of the other end of the oil distribution pipeline, and the plurality of inclined holes communicate with the second expansion chamber and the inner cavity of the oil distribution pipeline.

9. The high-efficiency oil separation structure for a scroll compressor according to claim 1, characterized in that: The other end of the oil distribution pipeline is provided with a compressor exhaust port.

10. The high-efficiency oil separation structure for a scroll compressor according to claim 1, characterized in that: The outer shell includes a high-pressure side shell and a static scroll. The high-pressure side shell is arranged on one side of the static scroll. The oil distribution pipeline, the first expansion chamber, the second expansion chamber and the oil storage chamber are all arranged between the high-pressure side shell and the static scroll.

Images