Exhaust cavity structure with high oil separation effect

Abstract

The utility model discloses an exhaust cavity structure with high -efficient oil separation effect, include: high pressure side casing, the first expansion chamber and the second expansion chamber are formed in the high pressure side casing, still be equipped with the oil separation pipe in the high pressure side casing, the oil separation cavity is formed in the oil separation pipe, the oil separation cavity is connected with first expansion chamber second expansion chamber respectively, still be equipped with the exhaust hole of second expansion chamber intercommunication on the high pressure side casing, wherein, high pressure oil gas mixture passes first expansion chamber oil separation cavity and second expansion chamber in proper order to carry out oil gas separation respectively, and the gas in second expansion chamber is discharged from the exhaust hole. The utility model discloses through setting up the second expansion chamber, further separates in the second expansion chamber, has solved the problem of lower efficiency of cyclone oil separator under too low or too high speed working condition.

Description

Technical Field

[0001] This utility model relates to the technical field of scroll compressors, and in particular to an exhaust chamber structure with high-efficiency oil separation effect. Background Technology

[0002] With the development of new energy vehicles, the requirements for air conditioning systems on scroll compressors are becoming increasingly stringent. First, based on the need for cost and rapid cooling, the maximum speed requirement for compressors is getting higher and higher; second, the high energy efficiency requirements in low-load ranges or certain special usage scenarios (such as the operating conditions of in-vehicle refrigerators) are causing the minimum speed requirement for compressors to also move towards ultra-low speeds.

[0003] At present, the normal operation of automotive compressors still cannot be separated from the lubrication of refrigeration oil. Since refrigeration oil is detrimental to the heat transfer of the air conditioning system, in order to improve the thermal efficiency of the system, the compressor should be designed to ensure that the refrigeration oil circulates inside the compressor as much as possible, thereby reducing its oil recycling rate (OCR) in the air conditioning system.

[0004] The key to improving the internal oil circulation rate of a compressor is to ensure the oil separation effect of the compressor at all speeds. However, the ever-expanding speed range places stringent demands on improving the internal oil circulation of the compressor, especially for compressors using sliding bearings. If the oil separation effect in the high-pressure chamber is poor at a certain speed (usually a low or high speed), the internal oil circulation will be interrupted. The sliding bearing bushing will experience a rapid temperature rise due to lack of oil in a short period of time, eventually leading to the shaft and bushing seizing up.

[0005] Chinese patent CN222391566U, "An Exhaust Cover for a Scroll Compressor," discloses an exhaust chamber structure for a scroll compressor. The oil separator uses a classic "return" shaped design, where oil and gas are separated primarily through the centrifugal force of the rotating oil separator pipe. The separated gaseous refrigerant enters the air conditioning system through the exhaust port, while the liquid oil enters the capillary tube through the oil return port, and after throttling, enters the low-pressure side to lubricate the shaft system.

[0006] The oil separator structure disclosed in Chinese patent CN114320897A-Scroll compressor, refrigeration equipment and vehicle is similar to that of CN222391566U. The main difference is that the oil outlet channel of the oil separator is raised by copper pipe or gasket to avoid direct impact of the oil discharge hole on the oil return hole, thereby preventing high pressure exhaust from entering the oil return hole.

[0007] The main drawbacks of the oil separation structure disclosed in CN222391566U are as follows:

[0008] 1. To ensure the centrifugal separation effect, the inlet diameter of the oil separator cylinder cannot be too large, which leads to a large pressure drop in the exhaust chamber, which is not conducive to improving the compressor's energy efficiency;

[0009] 2. The oil separation effect of the inner ring and outer ring of the "square-loop" shaped structure cannot be fully utilized;

[0010] 3. An oil separation insertion tube is arranged inside the oil separation cylinder. Although this component can improve the oil separation effect to a certain extent, it will cause a large pressure drop, further reduce the energy efficiency of the compressor, and increase the discharge temperature;

[0011] The main disadvantages of the oil separation structure disclosed in CN114320897A are as follows:

[0012] 4. Similar to the disadvantages 1 to 3 in CN222391566U;

[0013] 5. Although raising the height of the oil outlet avoids the direct impact of the oil discharge hole on the oil return hole, when the compressor is at a low rotation speed, the pressure difference between the oil separation chamber and the connecting passage may not be sufficient to discharge the oil from the oil outlet, resulting in gas returning from the oil return hole.

[0014] Therefore, the conventional structure for oil separation in the discharge chamber of a scroll compressor integrates a cyclone oil separator with the discharge pipe. After the oil therein is separated, the gaseous refrigerant is directly discharged from the discharge pipe, and the liquid oil flows out from the lower part. Generally, the cyclone oil separator has relatively high oil separation efficiency within a certain rotation speed range. When the rotation speed is too low or too high, the oil separation efficiency decreases, and even cannot meet the oil return requirement. Contents of the Utility Model

[0015] In view of the above existing problems of scroll compressors, the present invention aims to provide a discharge chamber structure with high-efficiency oil separation effect. By arranging a second expansion chamber to perform further separation in the second expansion chamber, the problem of low efficiency of the cyclone oil separator under too low or too high rotation speed working conditions is solved.

[0016] The specific technical solution is as follows:

[0017] A discharge chamber structure with high-efficiency oil separation effect, comprising: a high-pressure side housing;

[0018] A first expansion chamber and a second expansion chamber are formed in the high-pressure side housing;

[0019] An oil separation pipe is further arranged in the high-pressure side housing, an oil separation chamber is formed in the oil separation pipe, and the oil separation chamber is respectively communicated with the first expansion chamber and the second expansion chamber;

[0020] The high-pressure side housing is further provided with a discharge hole communicated with the second expansion chamber;

[0021] Wherein, the high-pressure oil-gas mixture sequentially passes through the first expansion chamber, the oil separation chamber and the second expansion chamber to perform oil-gas separation respectively, and the gas in the second expansion chamber is discharged from the discharge hole.

[0022] In the above-mentioned exhaust chamber structure with high oil separation efficiency, the orientation of the exhaust holes is staggered from the orientation of the exhaust port of the oil separation chamber.

[0023] The exhaust port of the oil separator is arranged in a first direction, and the exhaust hole is arranged in a second direction. The first direction and the second direction are parallel or form an angle.

[0024] In the above-mentioned exhaust chamber structure with high-efficiency oil separation effect, an oil storage chamber is formed inside the high-pressure side housing, and the oil storage chamber is connected to the first expansion chamber, the second expansion chamber, and the oil separation chamber respectively.

[0025] The above-mentioned exhaust chamber structure with high oil separation effect, wherein one side of the high-pressure side shell forms two chambers separated by an isolation wall, the inner chamber being the first expansion chamber, and the outer chamber being divided into the second expansion chamber and the oil storage chamber;

[0026] The oil separator is located on the other side of the high-pressure side housing.

[0027] The aforementioned exhaust chamber structure with high-efficiency oil separation further includes: a stationary vortex disk, which is installed on one side of the high-pressure side housing, and the stationary vortex disk and the high-pressure side housing form the first expansion chamber, the second expansion chamber, and the oil storage chamber.

[0028] In the above-mentioned exhaust chamber structure with high oil separation efficiency, the high-pressure oil-gas mixture is discharged from the static vortex disk and enters the first expansion chamber.

[0029] The stationary vortex disk is equipped with an oil passage capillary tube, which connects the oil storage chamber to the low-pressure side of the compressor.

[0030] The gas in the second expansion chamber enters the air conditioning system through the exhaust port.

[0031] In the above-mentioned exhaust chamber structure with high oil separation effect, an oil separation exhaust chamber is formed inside the second expansion chamber, and the exhaust port of the oil separation chamber is connected to the second expansion chamber through the oil separation exhaust chamber.

[0032] The above-mentioned exhaust chamber structure with high oil separation effect has a reinforcing rib in the outer cavity that separates the second expansion chamber and the oil storage chamber. The reinforcing rib is provided with an oil passage groove that connects the second expansion chamber and the oil storage chamber.

[0033] In the above-mentioned exhaust chamber structure with high-efficiency oil separation effect, at least one throttling hole is provided on the side wall of the oil separation pipe, and the first expansion chamber is connected to the oil separation chamber through the throttling hole.

[0034] In the above-mentioned exhaust chamber structure with high oil separation effect, the isolation wall and / or the static vortex disk are provided with an oil passage pipe, which connects the first expansion chamber and the oil storage chamber.

[0035] The positive effects of the above technical solution compared with the existing technology are:

[0036] This invention, by setting up a second expansion chamber, further separates the oil within the second expansion chamber, which can compensate for the problem of insufficient oil separation under low refrigerant flow conditions, thereby enabling the compressor to achieve efficient separation under any speed condition. Attached Figure Description

[0037] Figure 1 This is a cross-sectional view of the overall structure of an exhaust chamber structure with high oil separation efficiency according to the present invention.

[0038] Figure 2 This is a cross-sectional view of the high-pressure side shell in an exhaust chamber structure with high-efficiency oil separation effect according to this utility model;

[0039] Figure 3 This is a schematic diagram of the oil separation structure in an exhaust chamber structure with high oil separation efficiency according to this utility model;

[0040] Figure 4 This is a schematic diagram of the oil-gas separation in the second expansion chamber of an exhaust chamber structure with high oil separation efficiency according to this utility model.

[0041] Figure 5 This is a schematic diagram showing the angle formed between the exhaust port and the oil separator pipe in an exhaust chamber structure with high oil separation efficiency according to this utility model.

[0042] Figure 6 This is a schematic diagram of the structure of an exhaust chamber with high oil separation efficiency according to the present invention, in which the exhaust hole and the oil separation pipe are oriented parallel to each other.

[0043] Figure 7 This is a schematic diagram showing the structural distribution of exhaust holes, process holes, and the first isolation rib in an exhaust chamber structure with high oil separation efficiency according to this utility model.

[0044] Figure 8 This is a schematic diagram of the second embodiment of the throttling orifice in an exhaust chamber structure with high oil separation effect according to the present invention;

[0045] In the attached drawings: 1. High-pressure side housing; 2. Static vortex disk; 3. Oil circuit capillary tube; 4. Sealing mechanism; 11. First expansion chamber; 12. Oil separator pipe; 13. Second expansion chamber; 14. Oil storage chamber; 15. Isolation wall; 18. Exhaust port; 19. Process port; 121. Throttling orifice; 122. Oil separator chamber; 123. Oil drain port; 124. Exhaust port; 131. Oil separator exhaust chamber; 141. Oil separator drain chamber; 161. First isolation rib; 163. Reinforcing rib; 165. Second isolation rib; 171. Oil passage groove; 173. Oil passage pipe. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0047] like Figures 1 to 8 As shown, a preferred embodiment of an exhaust chamber structure with high oil separation efficiency is illustrated, comprising: a high-pressure side housing 1 and a stationary vortex disk 2, wherein the stationary vortex disk 2 is mounted on one side of the high-pressure side housing 1.

[0048] Furthermore, as a preferred embodiment, a first expansion chamber 11, a second expansion chamber 13, and an oil storage chamber 14 are formed inside the high-pressure side housing 1.

[0049] Furthermore, as a preferred embodiment, the high-pressure side housing 1 is also provided with an oil distribution pipe 12, and an oil distribution cavity 122 is formed in the oil distribution pipe 12. The oil distribution cavity 122 is connected to the first expansion cavity 11 and the second expansion cavity 13 respectively.

[0050] Furthermore, in a preferred embodiment, the oil storage chamber 14 is connected to the first expansion chamber 11, the second expansion chamber 13, and the oil distribution chamber 122, respectively.

[0051] Furthermore, as a preferred embodiment, the high-pressure side housing 1 is also provided with an exhaust port 18 that communicates with the second expansion chamber 13.

[0052] The high-pressure oil-gas mixture enters the first expansion chamber 11 for oil-gas separation. The oil separated in the first expansion chamber 11 enters the oil storage chamber 14. The remaining oil and gas separated in the first expansion chamber 11 enters the oil separator 122 and undergoes centrifugal separation. The oil separated in the oil separator 122 enters the oil storage chamber 14. The remaining oil and gas separated in the oil separator 122 enters the second expansion chamber 13 and undergoes oil-gas separation. The oil separated in the second expansion chamber 13 enters the oil storage chamber 14. The gaseous refrigerant separated in the second expansion chamber 13 enters the air conditioning system.

[0053] The oil and gas in this invention undergo three stages of oil separation.

[0054] Preferably, the oil separator 12 is a cyclone type oil separator. The cyclone type oil separator of this invention does not require an internal oil separator core rod, which can reduce refrigerant flow resistance and thus improve the compressor COP.

[0055] Traditional cyclone oil separators have high oil separation efficiency at medium and high speeds, but low efficiency at low speeds. This invention adds a two-stage expansion chamber for oil return to the cyclone oil separator, thereby compensating for the insufficient oil separation in the compressor at low speeds. This provides sufficient oil return for bearing lubrication and pump body sealing, thus improving compressor lifespan and performance.

[0056] The traditional integrated structure of oil separator and exhaust can only reduce exhaust pulsation in the first expansion chamber. The structure proposed in this invention has an additional second expansion chamber 13, which further reduces exhaust pulsation.

[0057] Furthermore, as a preferred embodiment, the orientation of the exhaust port 18 is offset from the orientation of the exhaust port 124 of the oil separator 122.

[0058] Furthermore, in a preferred embodiment, the exhaust port 124 of the oil separator 122 is disposed in a first direction, and the exhaust hole 18 is disposed in a second direction, wherein the first direction is parallel to or forms an angle with the second direction. The first direction and the second direction do not coincide.

[0059] Furthermore, when the orientation of the exhaust port 18 forms an angle with the orientation of the exhaust port 124 of the oil separator 122, the angle is α, where 10°≤α<90°.

[0060] This invention allows for customization of the oil separation pipe diameter based on the desired oil separation effect, without being affected by the exhaust hole diameter.

[0061] This utility model separates and staggers the cyclone oil separator pipe 12 from the exhaust port 18, so that a second expansion chamber 13 can be formed in the high-pressure side housing 1, thereby increasing the oil separator stage. The structure is compact and the layout is ingenious and reasonable, which greatly improves the oil separator efficiency of the compressor under low-speed conditions.

[0062] Furthermore, as a preferred embodiment, one side of the high-pressure side housing 1 is divided into two cavities by an isolation wall 15. The inner cavity is the first expansion cavity 11, and the outer cavity is divided into a second expansion cavity 13 and an oil storage cavity 14.

[0063] The outer cavity is located on the outer periphery of the inner cavity, and the two are separated by an isolation wall 15, which can shield the aerodynamic noise and valve plate impact noise of the first expansion cavity 11, thereby playing a noise reduction role.

[0064] Furthermore, as a preferred embodiment, an oil separator pipe 12 is provided on the other side of the high-pressure side housing 1.

[0065] Preferably, the oil separator 12 and the high-pressure side housing 1 are an integral structure, and the oil separator 12 is located inside the high-pressure side housing 1.

[0066] Furthermore, the first expansion cavity 11, the second expansion cavity 13, and the oil storage cavity 14 on the separate high-pressure side shell 1 are all open structures, and the first expansion cavity 11, the second expansion cavity 13, and the oil storage cavity 14 are formed between the stationary vortex disk 2 and the high-pressure side shell 1.

[0067] Furthermore, as a preferred embodiment, the high-pressure oil-gas mixture is discharged from the stationary volute 2 and enters the first expansion chamber 11; the stationary volute 2 is provided with an oil passage capillary tube 3, which connects the oil storage chamber 14 and the low-pressure side of the compressor; the gas in the second expansion chamber 13 enters the air conditioning system through the exhaust port 18.

[0068] Furthermore, as a preferred embodiment, an oil separation exhaust chamber 131 is formed in the second expansion chamber 13, and the exhaust port 124 of the oil separation chamber 122 is connected to the second expansion chamber 13 through the oil separation exhaust chamber 131.

[0069] The oil separator exhaust chamber 131 ensures that the exhaust gas only generates cyclones in a localized area, which greatly reduces the impact of the cyclones on the oil in the oil storage chamber 14 under high-speed conditions, thereby ensuring a stable oil level.

[0070] Furthermore, as a preferred embodiment, an oil separation and discharge chamber 141 is formed inside the oil storage chamber 14, and the oil discharge port 123 of the oil separation chamber 122 is connected to the oil storage chamber 14 through the oil separation and discharge chamber 141.

[0071] Furthermore, as a preferred embodiment, the outer cavity has a reinforcing rib 163 that separates the second expansion cavity 13 from the oil storage cavity, and the reinforcing rib 163 is provided with an oil passage groove 171 that connects the second expansion cavity 13 and the oil storage cavity 14.

[0072] Furthermore, as a preferred embodiment, at least one throttling hole 121 is provided on the side wall of the oil separator 12, and the first expansion chamber 11 is connected to the oil separator chamber 122 through the throttling hole 121.

[0073] The throttling orifice 121 can be a double circular orifice or a rectangular circular orifice, with the rectangular circular orifice being preferred.

[0074] Furthermore, as a preferred embodiment, the isolation wall 15 and / or the static vortex disk 2 are provided with an oil passage pipe 173, which connects the first expansion chamber 11 and the oil storage chamber 14.

[0075] Preferably, the oil passage 173 is a capillary channel.

[0076] Preferably, the oil pipe 173 can be separately installed on the isolation wall 15 so that the first expansion chamber 11 is connected to the oil storage chamber 14.

[0077] Preferably, the oil pipe 173 can be separately installed on the stationary vortex plate 2 so that the first expansion chamber 11 is connected to the oil storage chamber 14.

[0078] Preferably, the oil pipe 173 can be partially installed on the isolation wall 15 and the other part installed on the stationary vortex plate 2, and the two parts can be connected to achieve the connection between the first expansion chamber 11 and the oil storage chamber 14.

[0079] When the high-pressure side housing 1 is in use, one side of the high-pressure side housing 1 is arranged to the side, that is, the exhaust port 18 is located above the high-pressure side housing 1, the second expansion chamber 13 is located above the oil storage chamber 14, and the position where the oil pipe 173 connects to the first expansion chamber 11 is lower than the position where the oil pipe 173 connects to the oil storage chamber 14.

[0080] Furthermore, during machining or die casting, the cyclone oil separator pipe 12 will form a process hole 19 on the high-pressure side housing 1. The high-pressure side housing 1 is provided with a process hole 19 that is directly opposite to the exhaust port 124 of the oil separator chamber 122. The process hole 19 is located on the side wall of the oil separator exhaust chamber 131.

[0081] A plugging mechanism 4 is installed at process hole 19. The plugging mechanism 4 is a plug or a pressure relief valve.

[0082] When one side of the high-pressure side housing 1 is placed upwards, the oil separator pipe 12 is located at the bottom of the high-pressure side housing 1 and is set horizontally. At this time, the height of the side wall of the oil separator exhaust chamber 131 is not lower than the highest point of the exhaust hole 18, and the height of the side wall of the oil separator exhaust chamber 131 is not lower than the highest point of the process hole 19.

[0083] Furthermore, at least two first isolation ribs 161 are provided in the second expansion chamber 13, and an oil separation exhaust chamber 131 is formed between the first isolation ribs 161. The height of the first isolation ribs 161 is not lower than the highest point of the exhaust hole 18 and the height of the first isolation ribs 161 is not lower than the highest point of the process hole 19.

[0084] Furthermore, at least two second isolation ribs 165 are provided inside the oil storage cavity 14, and an oil separation and discharge cavity 141 is formed between the second isolation ribs 165.

[0085] Furthermore, the height of the reinforcing rib 163 is higher than the height of the first isolation rib 161, and the height of the reinforcing rib 163 is higher than the height of the second isolation rib 165.

[0086] Furthermore, the height of the reinforcing rib 163 is more than half the height of the high-pressure side shell 1.

[0087] Preferably, the bottom of the oil groove 171 on the reinforcing rib 163 is higher than the height of the first isolation rib 161, and the bottom of the oil groove 171 on the reinforcing rib 163 is higher than the height of the second isolation rib 165.

[0088] Preferably, each of the first isolation rib 161, the reinforcing rib 163, and the second isolation rib 165 is connected to the inner sides of the isolation wall 15 and the high-pressure side shell 1, respectively.

[0089] 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. An exhaust chamber structure with high-efficiency oil separation effect, characterized in that, include: High-voltage side housing; The high-pressure side housing has a first expansion cavity and a second expansion cavity formed therein; The high-pressure side housing is also provided with an oil distribution pipe, and an oil distribution cavity is formed in the oil distribution pipe. The oil distribution cavity is connected to the first expansion cavity and the second expansion cavity respectively. The high-pressure side housing is also provided with an exhaust port that communicates with the second expansion chamber; The high-pressure oil-gas mixture passes sequentially through the first expansion chamber, the oil separation chamber, and the second expansion chamber, where oil and gas are separated. The gas in the second expansion chamber is discharged from the exhaust port.

2. The exhaust chamber structure with high-efficiency oil separation effect according to claim 1, characterized in that, The orientation of the exhaust port is offset from the orientation of the exhaust port of the oil separator. The exhaust port of the oil separator is arranged in a first direction, and the exhaust hole is arranged in a second direction. The first direction and the second direction are parallel or form an angle.

3. The exhaust chamber structure with high-efficiency oil separation effect according to claim 1, characterized in that, An oil storage chamber is formed inside the high-pressure side housing, and the oil storage chamber is connected to the first expansion chamber, the second expansion chamber, and the oil distribution chamber.

4. The exhaust chamber structure with high-efficiency oil separation effect according to claim 3, characterized in that, One side of the high-pressure side housing is divided into two cavities by an isolation wall. The inner cavity is the first expansion cavity, and the outer cavity is divided into the second expansion cavity and the oil storage cavity. The oil separator is located on the other side of the high-pressure side housing.

5. The exhaust chamber structure with high-efficiency oil separation effect according to claim 4, characterized in that, Also includes: A stationary vortex disk is installed on one side of the high-pressure side housing, and the stationary vortex disk and the high-pressure side housing form the first expansion cavity, the second expansion cavity, and the oil storage cavity.

6. The exhaust chamber structure with high-efficiency oil separation effect according to claim 5, characterized in that, The high-pressure oil-gas mixture is discharged from the static vortex disk and enters the first expansion chamber; The stationary vortex disk is equipped with an oil passage capillary tube, which connects the oil storage chamber to the low-pressure side of the compressor. The gas in the second expansion chamber enters the air conditioning system through the exhaust port.

7. The exhaust chamber structure with high-efficiency oil separation effect according to claim 1, characterized in that, An oil separation exhaust chamber is formed inside the second expansion chamber, and the exhaust port of the oil separation chamber is connected to the second expansion chamber through the oil separation exhaust chamber.

8. The exhaust chamber structure with high-efficiency oil separation effect according to claim 4, characterized in that, The outer cavity has a reinforcing rib that separates the second expansion cavity from the oil storage cavity. The reinforcing rib is provided with an oil passage groove that connects the second expansion cavity and the oil storage cavity.

9. The exhaust chamber structure with high-efficiency oil separation effect according to claim 1, characterized in that, At least one throttling orifice is provided on the side wall of the oil separator, and the first expansion chamber is connected to the oil separator chamber through the throttling orifice.

10. The exhaust chamber structure with high-efficiency oil separation effect according to claim 5, characterized in that, The isolation wall and / or the static vortex disk are provided with an oil passage pipe, which connects the first expansion chamber and the oil storage chamber.

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