Exhaust cavity structure with efficient oil separation effect

Abstract

The invention discloses an exhaust cavity structure with an efficient oil separation effect. The exhaust cavity structure comprises a high-pressure side shell; a first expansion cavity and a second expansion cavity are formed in the high-pressure side shell; an oil branch pipe is further arranged in the high-pressure side shell, an oil branch cavity is formed in the oil branch pipe, and the oil branch cavity is communicated with the first expansion cavity and the second expansion cavity. The high-pressure side shell is further provided with an exhaust hole communicating with the second expansion cavity. Wherein high-pressure oil-gas mixed gas sequentially passes through the first expansion cavity, the oil separation cavity and the second expansion cavity and is subjected to oil-gas separation, and gas in the second expansion cavity is exhausted from the exhaust hole. According to the cyclone oil separator, the second expansion cavity is arranged, separation is further carried out in the second expansion cavity, and the problem that the efficiency of the cyclone oil separator is low under the working condition of too low or too high rotating speed is solved.

Description

Technical Field

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

[0002] With the development of new energy vehicles, air conditioning systems are placing increasingly stringent demands on scroll compressors. First, cost and rapid cooling requirements drive the demand for higher maximum compressor speeds. Second, high energy efficiency requirements in low-load ranges or in certain special usage scenarios (such as in-car refrigerators) are driving the demand for ultra-low minimum compressor speeds.

[0003] At the current stage, the normal operation of automotive compressors still cannot be separated from the lubrication of refrigeration oil. Since refrigeration oil is not conducive to the heat transfer of the air-conditioning system, in order to improve the thermal efficiency of the system, the compressor design should ensure that the refrigeration oil circulates inside the compressor as much as possible and reduce its oil circulation rate (OCR) in the air-conditioning system.

[0004] The key to improving the oil circulation rate within a compressor is to ensure effective oil separation at all speeds. However, the ever-expanding speed range places stringent demands on improving oil circulation within the compressor, especially for compressors using sliding bearings. Once the high-pressure chamber oil separation is poor at a certain speed (usually low or high), the internal oil circulation will be interrupted. The sliding bearing bushing will quickly heat up due to lack of oil, eventually leading to shaft and bushing locking.

[0005] Chinese patent "CN222391566U - A Scroll Compressor Exhaust Cover" discloses a scroll compressor exhaust chamber structure. The oil separator adopts a classic "U"-shaped oil separator design. The oil separator mainly separates oil and gas through the centrifugal action of the oil separator pipe. The separated gaseous refrigerant enters the air conditioning pipeline through the exhaust port, while the liquid oil enters the capillary tube through the oil return port. After throttling, it enters the low-pressure side to lubricate the shaft system.

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

[0007] The main disadvantages 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 cannot be too large, which will lead to a large pressure drop in the exhaust chamber, which is not conducive to improving the energy efficiency of the compressor;

[0009] 2. The oil separation effect of the inner and outer rings of the "U"-shaped structure is not fully utilized;

[0010] 3. There is an oil separation insert inside the oil separator. 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 exhaust temperature;

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

[0012] 4. Similar to shortcomings 1-3 in CN222391566U;

[0013] 5. Although raising the height of the oil outlet can avoid the direct impact of the oil drain hole on the oil return hole, when the compressor rotates at low speed, the pressure difference between the oil separation chamber and the connecting channel may not be able to discharge the oil from the oil outlet, resulting in air return from the oil return hole.

[0014] Therefore, the conventional structure of the scroll compressor exhaust chamber oil separation is a cyclone oil separator integrated with the exhaust pipe. After the oil and liquid are separated, the gaseous refrigerant is directly discharged from the exhaust pipe, and the liquid oil flows out from the bottom. Usually, the cyclone oil separator has a high oil separation efficiency within a certain speed range. When the speed is too low or too high, the oil separation efficiency decreases and may even fail to meet the oil return demand. Summary of the Invention

[0015] In response to the above-mentioned problems existing in the existing vortex, the present invention aims to provide an exhaust chamber structure with efficient oil separation effect. By setting a second expansion chamber, further separation is achieved in the second expansion chamber, thereby solving the problem of low efficiency of the cyclone oil separator under conditions of too low or too high speed.

[0016] The specific technical solutions are as follows:

[0017] An exhaust chamber structure with a high-efficiency oil separation effect comprises: a high-pressure side shell;

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

[0019] An oil distribution pipe is further provided in the high-pressure side housing, and an oil distribution chamber is formed in the oil distribution pipe. The oil distribution chamber is communicated with the first expansion chamber and the second expansion chamber respectively.

[0020] The high-pressure side housing is further provided with an exhaust hole communicating with the second expansion chamber;

[0021] The high-pressure oil-gas mixture passes through the first expansion chamber, the oil separation chamber and the second expansion chamber in sequence, and is separated into oil and gas respectively. The gas in the second expansion chamber is discharged from the exhaust hole.

[0022] The exhaust chamber structure with a high-efficiency oil separation effect is described above, wherein the direction of the exhaust hole and the direction of the exhaust port of the oil separation chamber are staggered;

[0023] The exhaust port of the oil separation chamber is arranged toward a first direction, and the exhaust hole is arranged toward a second direction. The first direction is parallel to the second direction or forms an angle.

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

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

[0026] The oil distribution pipe is provided on the other side of the high-pressure side shell.

[0027] The above-mentioned exhaust chamber structure with high-efficiency oil separation effect also includes: a static vortex, which is installed on one side of the high-pressure side shell, and the first expansion chamber, the second expansion chamber, and the oil storage chamber are formed between the static vortex and the high-pressure side shell.

[0028] The above-mentioned exhaust chamber structure with high-efficiency oil separation effect, wherein the high-pressure oil-air mixture is discharged from the static scroll into the first expansion chamber;

[0029] An oil capillary is provided in the static scroll, and the oil capillary connects the oil storage cavity with the low-pressure side of the compressor;

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

[0031] In the above-mentioned exhaust chamber structure with high-efficiency oil separation effect, an oil separation exhaust chamber is formed in 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 efficient oil separation effect, wherein the outer chamber has a reinforcing rib separating the second expansion chamber and the oil storage chamber, and the reinforcing rib is provided with an oil groove, and the oil groove 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] The above-mentioned exhaust chamber structure with high-efficiency oil separation effect, wherein the isolation wall and / or the static vortex is provided with an oil pipe, and the oil pipe connects the first expansion chamber and the oil storage chamber.

[0035] Compared with the prior art, the above technical solution has the following positive effects:

[0036] The present invention provides a second expansion chamber and further separates in the second expansion chamber, which can compensate for the problem of insufficient oil under low refrigerant flow conditions, thereby enabling the compressor to achieve efficient separation under any speed conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0039] Figure 3 This is a schematic diagram of the oil separation structure in an exhaust cavity structure with a high-efficiency oil separation effect according to the present invention;

[0040] Figure 4 This is a schematic diagram of oil and gas separation in the second expansion chamber of an exhaust chamber structure with high-efficiency oil separation effect according to the present invention;

[0041] Figure 5 This is a schematic structural diagram of the angle formed by the directions of the exhaust holes and the oil separation pipe in an exhaust cavity structure with a high-efficiency oil separation effect of the present invention;

[0042] Figure 6 This is a schematic diagram of a structure in which the exhaust holes and the oil separation pipe are parallel in orientation in an exhaust cavity structure with a high-efficiency oil separation effect according to the present invention;

[0043] Figure 7 This is a schematic diagram of the structural distribution of exhaust holes, process holes and first isolation ribs in an exhaust cavity structure with high-efficiency oil separation effect according to the present invention;

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

[0045] In the accompanying drawings: 1. High-pressure side casing; 2. Static vortex; 3. Oil circuit capillary; 4. Sealing mechanism; 11. First expansion chamber; 12. Oil distribution pipe; 13. Second expansion chamber; 14. Oil storage chamber; 15. Isolation wall; 18. Exhaust hole; 19. Process hole; 121. Throttle hole; 122. Oil distribution chamber; 123. Oil drain port; 124. Exhaust port; 131. Oil distribution exhaust chamber; 141. Oil distribution chamber; 161. First isolation rib; 163. Reinforcement rib; 165. Second isolation rib; 171. Oil trough; 173. Oil pipe. DETAILED DESCRIPTION

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

[0047] like Figures 1 to 8 , shows an exhaust chamber structure with a high-efficiency oil separation effect according to a preferred embodiment, comprising: a high-pressure side casing 1 and a static scroll 2 , wherein the static scroll 2 is mounted on one side of the high-pressure side casing 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 in the high-pressure side housing 1 .

[0049] Furthermore, as a preferred embodiment, an oil separation pipe 12 is further provided in the high-pressure side shell 1 , and an oil separation chamber 122 is formed in the oil separation pipe 12 . The oil separation chamber 122 is communicated with the first expansion chamber 11 and the second expansion chamber 13 respectively.

[0050] Furthermore, as a preferred embodiment, the oil storage chamber 14 is communicated with the first expansion chamber 11 , the second expansion chamber 13 , and the oil separation chamber 122 , respectively.

[0051] Furthermore, as a preferred embodiment, the high-pressure side shell 1 is further provided with an exhaust hole 18 communicating 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 enter the oil separation chamber 122, and are centrifugally separated in the oil separation chamber 122, the oil separated in the oil separation chamber 122 enters the oil storage chamber 14, the remaining oil and gas separated in the oil separation chamber 122 enter the second expansion chamber 13, and are subjected to oil-gas separation in the second expansion chamber 13, the oil separated in the second expansion chamber 13 enters the oil storage chamber 14, and the gas refrigerant separated in the second expansion chamber 13 enters the air-conditioning system.

[0053] The oil and gas of the present invention undergo three stages of oil separation.

[0054] Preferably, the oil distribution pipe 12 is a cyclone oil distribution pipe. The cyclone oil distribution pipe of the present invention does not require an oil distribution core rod to be inserted, which can reduce the refrigerant flow resistance and thus improve the compressor COP.

[0055] Traditional cyclonic oil distribution pipes have high oil separation efficiency at medium and high speeds, but are less efficient at low speeds. This invention improves on the cyclonic oil distribution pipe by adding a two-stage expansion chamber oil return function, thereby compensating for insufficient oil separation at low speeds. This provides sufficient oil return for bearing lubrication and pump seals, thereby improving compressor life and performance.

[0056] The traditional oil distribution pipe exhaust integrated structure can only reduce the exhaust pulsation in the first expansion chamber. The structure proposed by the present invention further reduces the exhaust pulsation due to the addition of the second expansion chamber 13.

[0057] Furthermore, as a preferred embodiment, the direction of the exhaust hole 18 and the direction of the exhaust port 124 of the oil separation chamber 122 are staggered.

[0058] Furthermore, as a preferred embodiment, the exhaust port 124 of the oil separation chamber 122 is arranged in a first direction, and the exhaust hole 18 is arranged in a second direction, and the first direction and the second direction are parallel or form an angle. The first direction and the second direction do not overlap.

[0059] Furthermore, when the direction of the exhaust hole 18 forms an angle with the direction of the exhaust port 124 of the oil separation chamber 122 , the angle is α, and 10°≤α<90°.

[0060] The present invention can customize the diameter of the oil separation pipe according to the requirements of the oil separation effect, without being affected by the diameter of the exhaust hole.

[0061] The present invention separates and staggers the cyclone oil separation pipe 12 and the exhaust hole 18, so that a second expansion chamber 13 can be formed in the high-pressure side shell 1, thereby adding a level of oil separation. The structure is compact, the layout is ingenious and reasonable, and the oil separation efficiency of the compressor under low-speed working conditions is greatly improved.

[0062] Furthermore, as a preferred embodiment, one side of the high-pressure side shell 1 forms two cavities separated by an inner and outer cavity through a separation wall 15, the inner cavity is a 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 periphery of the inner cavity, and the two are separated by a separation wall 15, which can shield the pneumatic noise of the first expansion cavity 11 and the valve plate hitting noise, thereby playing a noise reduction role.

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

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

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

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

[0068] Furthermore, as a preferred embodiment, an oil exhaust cavity 131 is formed in the second expansion cavity 13 , and the exhaust port 124 of the oil exhaust cavity 122 is communicated with the second expansion cavity 13 through the oil exhaust cavity 131 .

[0069] The oil separation exhaust cavity 131 allows the exhaust to generate cyclones only in a local area, which greatly reduces the impact of the cyclones on the oil in the oil storage cavity 14 under high-speed working conditions, thereby ensuring a stable oil level.

[0070] Furthermore, as a preferred embodiment, an oil separation drain chamber 141 is formed in the oil storage chamber 14 , and the oil discharge port 123 of the oil separation chamber 122 is communicated with the oil storage chamber 14 through the oil separation drain chamber 141 .

[0071] Furthermore, as a preferred embodiment, the outer cavity has a reinforcing rib 163 separating the second expansion cavity 13 from the oil storage cavity. The reinforcing rib 163 is provided with an oil groove 171 , which 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 distribution pipe 12 , and the first expansion chamber 11 is communicated with the oil distribution chamber 122 through the throttling hole 121 .

[0073] The throttle hole 121 can be a double circular hole or a rectangular circular hole, and the rectangular circular hole is preferred.

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

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

[0076] Preferably, the oil pipe 173 can be separately provided on the isolation wall 15 to connect the first expansion chamber 11 with the oil storage chamber 14 .

[0077] Preferably, the oil passage 173 may be separately provided on the fixed scroll 2 so as to connect the first expansion chamber 11 with the oil storage chamber 14 .

[0078] Preferably, the oil pipe 173 can have a portion thereof disposed on the isolation wall 15 and another portion disposed on the static scroll 2 , and these two portions are connected, thereby achieving communication between the first expansion chamber 11 and the oil storage chamber 14 .

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

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

[0081] A blocking mechanism 4 is installed at the process hole 19 , and the blocking mechanism 4 is a plug or a pressure relief valve.

[0082] When the high-pressure side housing 1 is placed with one side facing upward, the oil separation pipe 12 is located at the bottom of the high-pressure side housing 1 and is arranged horizontally. At this time, the height of the side wall of the oil separation 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 separation 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 arranged in the second expansion chamber 13, and an oil exhaust chamber 131 is formed between the first isolation ribs 161. The height of the first isolation rib 161 is not lower than the highest point of the exhaust hole 18, and the height of the first isolation rib 161 is not lower than the highest point of the process hole 19.

[0084] Furthermore, at least two second isolation ribs 165 are provided in the oil storage cavity 14 , and an oil 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 higher than half the height of the high-pressure side shell 1 .

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

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

[0089] 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. An exhaust chamber structure with high oil separation effect, characterized in that: include: High-pressure side housing; A first expansion chamber and a second expansion chamber are formed in the high-pressure side housing; An oil distribution pipe is further provided in the high-pressure side housing, and an oil distribution chamber is formed in the oil distribution pipe. The oil distribution chamber is communicated with the first expansion chamber and the second expansion chamber respectively. The high-pressure side housing is further provided with an exhaust hole communicating with the second expansion chamber; The high-pressure oil-gas mixture passes through the first expansion chamber, the oil separation chamber and the second expansion chamber in sequence, and is separated into oil and gas respectively. The gas in the second expansion chamber is discharged from the exhaust hole.

2. The exhaust chamber structure with high-efficiency oil separation effect according to claim 1, characterized in that: The direction of the exhaust hole and the direction of the exhaust port of the oil separation chamber are staggered; The exhaust port of the oil separation chamber is arranged toward a first direction, and the exhaust hole is arranged toward a second direction. The first direction is parallel to the second direction or forms an angle.

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

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 formed into two cavities separated by an inner and an outer cavity through a separation 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 distribution pipe is provided on the other side of the high-pressure side shell.

5. The exhaust chamber structure with high-efficiency oil separation effect according to claim 3, characterized in that: Also includes: A static scroll is installed on one side of the high-pressure side housing, and the first expansion chamber, the second expansion chamber, and the oil storage chamber are formed between the static scroll and the high-pressure side housing.

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 fixed scroll into the first expansion chamber; An oil capillary is provided in the static scroll, and the oil capillary connects the oil storage cavity with the low-pressure side of the compressor; The gas in the second expansion chamber enters the air conditioning system through the exhaust hole.

7. The exhaust chamber structure with high oil separation effect according to claim 1, characterized in that: An oil separation exhaust cavity is formed in the second expansion cavity, and an exhaust port of the oil separation cavity is communicated with the second expansion cavity through the oil separation exhaust cavity.

8. The exhaust chamber structure with high oil separation effect according to claim 4, characterized in that: A reinforcing rib is provided in the outer cavity for separating the second expansion cavity and the oil storage cavity. An oil passage groove is provided on the reinforcing rib, and the oil passage groove 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 hole is provided on the side wall of the oil distribution pipe, and the first expansion chamber is communicated with the oil distribution chamber through the throttling hole.

10. The exhaust chamber structure with high-efficiency oil separation effect according to claim 5, characterized in that: An oil passage is provided on the isolation wall and / or the static vortex, and the oil passage connects the first expansion chamber and the oil storage chamber.

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