High-efficiency oil separation structure for scroll compressor

Abstract

The utility model discloses a kind of high-efficiency oil separation structures used in scroll compressor, it is related to compressor technical field, including shell and oil separation pipeline, the inside of shell is provided with first expansion chamber, the upside of first expansion chamber is provided with second expansion chamber, the downside of first expansion chamber is provided with oil storage chamber, one end of oil separation pipeline is inserted into oil storage chamber, another end of oil separation pipeline is through shell, first expansion chamber is communicated second expansion chamber and oil storage chamber, second expansion chamber is communicated with oil storage chamber, and oil separation pipeline is communicated oil storage chamber and second expansion chamber. In the utility model, by the setting of first expansion chamber, second expansion chamber and oil separation pipeline, realize three-stage oil-gas separation process, compared with traditional single cyclone type oil separator, oil liquid in oil-gas can be more fully separated.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a high-efficiency oil separator structure used in scroll compressors. Background Technology

[0002] As a core component of a refrigeration system, the performance of a scroll compressor directly affects the overall system's operating efficiency and stability. During the operation of a scroll compressor, the design of the oil separator within the exhaust chamber is crucial.

[0003] Currently, the conventional design for oil separation in the exhaust chamber of scroll compressors integrates a cyclone oil separator with the exhaust pipe. In this design, the oil-containing gaseous refrigerant enters the cyclone oil separator, where centrifugal force separates the oil 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 only achieves high oil separation efficiency within a certain speed range. When the scroll compressor speed is too low, the gas flow rate slows down, and the centrifugal force is insufficient, making it difficult to fully separate the oil. This results in the discharged gaseous refrigerant still containing a significant amount of oil, failing to meet the oil return requirements and thus affecting the compressor's lubrication and normal operation. On the other hand, when the compressor speed is too high, although the gas flow rate increases, the movement of oil droplets in the high-speed airflow becomes more complex, and some oil droplets may not be separated in time and are carried away, similarly leading to a decrease in oil separation efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency oil separator structure for use in scroll compressors, in order to solve the above-mentioned technical problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A high-efficiency oil separator structure for use in a scroll compressor includes a housing and an oil separator pipeline. The housing has a first expansion chamber inside, a second expansion chamber above the first expansion chamber, and an oil storage chamber below the first expansion chamber. One end of the oil separator pipeline extends into the oil storage chamber, and the other end of the oil separator pipeline passes through the housing. The first expansion chamber connects the second expansion chamber and the oil storage chamber, and the second expansion chamber is connected to the oil storage chamber. The oil separator pipeline connects the oil storage chamber and the second expansion chamber.

[0007] Preferably, an upper partition wall is also included, wherein the upper partition wall is disposed between the first expansion cavity and the second expansion cavity.

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

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

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

[0011] As a further preferred embodiment, one end of the upper isolation wall is provided with a notch, and the other end of the upper isolation wall is provided with a third capillary channel. 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, one end of the oil separator is provided with a capillary hole, which connects the oil storage chamber and the inner cavity of the oil separator.

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

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

[0015] Preferably, the outer casing includes a high-pressure side casing and a stationary vortex disk. The high-pressure side casing is disposed on one side of the stationary vortex disk, and the oil distribution pipeline, the first expansion chamber, the second expansion chamber, and the oil storage chamber are all disposed between the high-pressure side casing and the stationary vortex disk.

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

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

[0018] (2) In this utility model, 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-gas velocity and uses the combined effect of gravity and centrifugal force to separate more oil. This design enables the compressor to achieve efficient oil separation at various speeds, improves the compressor's adaptability to different working conditions, and ensures the stable operation of the refrigeration system.

[0019] (3) In this utility model, by setting up the first expansion chamber, the second expansion chamber and the oil distribution pipeline, the compressor oil and gas pass through the expansion chamber twice and the oil distribution pipeline chamber once before being discharged from the exhaust port. These chambers play a role in buffering and stabilizing pressure, which effectively reduces the pressure pulsation at the compressor exhaust port. Stable exhaust pressure helps to reduce vibration and noise during compressor operation, improves the stability and comfort of compressor operation, and also helps to protect other equipment connected to the compressor.

[0020] (4) In this invention, the independently set oil storage chamber and the design of connecting the oil storage chamber and each expansion chamber through capillary channels greatly reduce the impact of exhaust cyclones on the oil in the high-pressure chamber. The capillary channels utilize capillary action to allow the oil to flow into the oil storage chamber stably and slowly, avoiding oil fluctuations and instability caused by cyclone impact. The stable oil level ensures that there is always enough lubricating oil inside the compressor, maintaining good lubrication conditions and further improving the reliability and service life of the compressor. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal structure of the high-efficiency oil separator used in the scroll compressor of this utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the internal structure of the high-efficiency oil separator used in the scroll compressor of this utility model. Figure 2 .

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

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Figure 1 This is a schematic diagram of the internal structure of the high-efficiency oil separator used in the scroll compressor of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the internal structure of the high-efficiency oil separator used in the scroll compressor of this utility model. Figure 2 Please see Figures 1 to 2 The diagram illustrates a high-efficiency oil separator structure used in a scroll compressor, comprising a housing and an oil separator pipeline 14. The housing contains a first expansion chamber 11, a second expansion chamber 12 is located above the first expansion chamber 11, and an oil storage chamber 13 is located below the first expansion chamber 11. One end of the oil separator pipeline 14 extends into the oil storage chamber 13, and the other end of the pipeline 14 penetrates the housing. The first expansion chamber 11 connects to the second expansion chamber 12 and the oil storage chamber 13, and the second expansion chamber 12 connects to the oil storage chamber 13. The oil separator pipeline 14 connects to both the oil storage chamber 13 and the second expansion chamber 12. The housing includes a high-pressure side housing 1 and a stationary scroll 2. The high-pressure side housing 1 is located on one side of the stationary scroll 2. The oil separator pipeline 14, the first expansion chamber 11, the second expansion chamber 12, and the oil storage chamber 13 are all located between the high-pressure side housing 1 and the stationary scroll 2. The stationary scroll 2 has an 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 sufficient space and conditions for oil-gas separation, enabling multiple separations of oil in the oil-gas mixture and improving the oil-gas separation efficiency. A return oil pipe 19 is provided on the stationary scroll plate 2, which is connected to the oil storage chamber 13, facilitating the return of oil to the low-pressure side of the compressor, thereby achieving continuous oil lubrication of the shaft system.

[0028] Furthermore, as a preferred embodiment, it also includes an upper isolation wall 15, which is disposed between the first expansion chamber 11 and the second expansion chamber 12. It also includes a lower isolation wall 16, which is disposed between the first expansion chamber 11 and the oil storage chamber 13. One end of the lower isolation wall 16 is provided with a first capillary channel 161, and the other end is provided with a second capillary channel 162. The first capillary channel 161 and the second capillary channel 162 respectively connect the first expansion chamber 11 and the oil storage chamber 13. The upper isolation wall 15 is composed of several sections of baffles with different slopes but the same inclination direction. This design helps guide the flow of oil and gas between different expansion chambers, making the distribution of oil and gas within the chamber more uniform and improving the separation effect. In addition, one end of the upper isolation wall 15 is provided with a notch 151, and the other end is provided with a third capillary channel 17, which is disposed on the inner wall of the outer casing. See details below. Figure 1 As shown, the notch 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 oil and gas and oil can flow along 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 capillary channel design utilizes capillary action, allowing the oil to flow into the oil storage chamber 13 more stably and slowly, avoiding backflow or mixing of oil 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 separator pipe 14 is provided with a capillary orifice 142, which connects the oil storage chamber 13 and the inner cavity of the oil separator pipe 14, allowing the separated oil to flow smoothly into the oil storage chamber 13 during the final stage of oil-gas separation. The other end of the oil separator pipe 14 has several oblique holes 141 on its outer wall, which connect the second expansion chamber 12 and the inner cavity of the oil separator pipe 14, facilitating the entry of oil and gas into the oil separator pipe 14 for final separation. Moreover, the other end of the oil separator pipe 14 is provided with a compressor exhaust port 143, simplifying the structure while ensuring that the fully separated refrigerant gas can be smoothly discharged into the air conditioning system. This refined design of the oil separator pipe 14 not only improves oil separation efficiency but also makes the entire oil separator structure more compact and rational, which is beneficial for the miniaturization and integration of the scroll compressor.

[0030] In this embodiment, the oil and gas undergo three stages of oil separation through the arrangement of the first expansion chamber 11, the second expansion chamber 12 and the oil separation pipeline 14, resulting in a more thorough oil separation effect. In addition, the cyclone oil-gas separator is usually less efficient at low speeds, but the addition of two expansion chambers can make up for the problem of insufficient oil separation at low speeds, so that the compressor can achieve efficient oil separation at all speeds.

[0031] In this embodiment, the high-pressure chamber between the high-pressure side housing 1 and the stationary scroll 2 is divided into multiple chambers. Before being discharged from the exhaust port, the compressor oil and gas pass through two expansion chambers and one oil separator pipe 14. This design effectively reduces pressure pulsation at the compressor exhaust port 143, improving the stability of compressor operation. Furthermore, an independently provided oil reservoir 13, connected to any expansion chamber via a capillary channel, significantly reduces the impact of the exhaust cyclone on the oil in the high-pressure chamber, ensuring a stable oil level. Under different operating conditions, a stable oil level helps maintain good lubrication conditions inside the compressor, extending its service life.

[0032] Furthermore, as a preferred implementation, the other end of the oil separator pipeline 14 is provided with a compressor exhaust port 143 to ensure that the gaseous refrigerant after sufficient oil separation can be smoothly discharged into the air conditioning system.

[0033] In this embodiment, the oil distribution pipeline 14 passes through the upper isolation wall 15 and the lower isolation wall 16 and communicates with the outside of the high-pressure side housing 1, for discharging gaseous refrigerant into the air conditioning system. The outer wall of the oil distribution pipeline 14 is sealed to the upper isolation wall 15, the lower isolation wall 16, and the high-pressure side housing 1.

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

[0035] The area relationships of the three cavities—first expansion chamber 11 (V1), second expansion chamber 12 (V2), and oil storage chamber 13 (V3)—satisfy 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 discharge port 143, the inner diameter d2 of the inclined hole 141, and the cross-sectional area S1 of the notch 151 satisfies the following equation:

[0039] 0.6π≤4*S1*d5 2 ≤1.5π

[0040] 0.2≤d² / d⁵≤0.3

[0041] During operation, the high-pressure oil-gas mixture is discharged from the exhaust port of the stationary vortex disk 2 and first enters the first expansion chamber 11 for initial oil-gas separation. During this process, due to the sudden expansion of the space, the oil-gas velocity decreases, and some 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-gas enters the second expansion chamber 12 through the notch 151 on the upper isolation wall 15 for secondary oil-gas separation. Similarly, in the second expansion chamber 12, some oil sinks again and enters the oil storage chamber 13 through the third capillary channel 17. Finally, the remaining oil-gas enters the oil separator pipe 14 through the inclined hole 141 at the other end of the oil separator pipe 14 for further oil-gas separation. The separated oil enters the oil storage chamber 13 through the capillary hole 142, and the remaining gaseous refrigerant enters the air conditioning system through the compressor exhaust port 143. Through this three-stage oil-gas separation process, the oil separation effect is significantly improved compared to the traditional single cyclone oil separator, ensuring that the oil can be separated more fully at different speeds to meet the oil return requirements.

[0042] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency oil separation structure for use in a scroll compressor, characterized by comprising: The device includes a housing and an oil distribution pipeline. The housing has a first expansion chamber inside, a second expansion chamber above the first expansion chamber, and an oil storage chamber below 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 housing. The first expansion chamber connects the second expansion chamber and the oil storage chamber. The second expansion chamber is connected to the oil storage chamber. The oil distribution pipeline connects the oil storage chamber and the second expansion chamber.

2. The high efficiency oil separation structure for use in a scroll compressor according to claim 1, wherein It also includes an upper isolation wall, which is provided between the first expansion cavity and the second expansion cavity.

3. The high efficiency oil separation structure for use in a scroll compressor according to claim 1, wherein It also includes a lower isolation wall, which is provided between the first expansion chamber and the oil storage chamber.

4. The high efficiency oil separation structure for use in a scroll compressor according to claim 3, wherein One end of the lower isolation wall is provided with a first capillary channel, and the other end of the lower isolation wall is provided with a second capillary channel. The first capillary channel and the second capillary channel are respectively connected to the first expansion chamber and the oil storage chamber.

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

6. The high-efficiency oil separator structure used in the scroll compressor as described in claim 2, characterized in that, One end of the upper isolation wall is provided with a notch, and the other end of the upper isolation wall is provided with a third capillary channel. 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 use in a scroll compressor according to claim 1, wherein One end of the oil separator pipeline is provided with a capillary hole, which connects the oil storage chamber and the inner cavity of the oil separator pipeline.

8. The high efficiency oil separation structure for use in a scroll compressor according to claim 1, wherein The other end of the oil separator pipeline has several oblique holes on its outer wall, and these oblique holes connect the second expansion chamber and the inner cavity of the oil separator pipeline.

9. The high efficiency oil separation structure for use in a scroll compressor according to claim 1, wherein The other end of the oil separator pipeline is equipped with a compressor exhaust port.

10. The high efficiency oil separation structure for use in a scroll compressor according to claim 1, wherein The outer casing includes a high-pressure side casing and a stationary vortex disk. The high-pressure side casing is disposed on one side of the stationary vortex disk. The oil distribution pipeline, the first expansion chamber, the second expansion chamber, and the oil storage chamber are all disposed between the high-pressure side casing and the stationary vortex disk.

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