CN209943099U - Multistage rotary compressor with top middle cavity - Google Patents
Multistage rotary compressor with top middle cavity Download PDFInfo
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- CN209943099U CN209943099U CN201920780732.5U CN201920780732U CN209943099U CN 209943099 U CN209943099 U CN 209943099U CN 201920780732 U CN201920780732 U CN 201920780732U CN 209943099 U CN209943099 U CN 209943099U
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Abstract
A multi-stage rotary compressor with a top middle cavity comprises a shell, a motor and a pump body, wherein the middle cavity is positioned at the top of the pump body, exhaust gas of a low-pressure stage cylinder and medium-pressure inlet gas of a system are mixed in the middle cavity and then enter a high-pressure stage cylinder from an air suction port; the low-pressure-stage cylinder is close to the lower part of the middle cavity, and the oil supply cavity of the sliding sheet groove of the low-pressure-stage cylinder is connected with the middle cavity through an oil collecting hole and is separated from the shell oil sump; an oil collecting groove is formed in the corresponding position of the oil collecting hole, and the accumulated liquid in the middle cavity is collected by the groove so as to supply oil to the sliding sheet groove of the low-pressure cylinder; the middle cavity is internally provided with a thin wall for dividing a flow passage, the two paths of inlet air are guided to be mixed firstly and then reach an air suction port to be discharged, and meanwhile, the two paths of inlet air carrying liquid are effectively separated; the utility model discloses a provide the design of multistage rotary compressor middle chamber, when the intensive mixing multichannel admits air, prevent that the high-pressure stage cylinder from inhaling and taking liquid, also prevent that middle chamber hydrops is too much.
Description
Technical Field
The utility model relates to a multistage rotary compressor, concretely relates to take multistage rotary compressor in top middle chamber for refrigeration/heat pump system.
Background
Rotary compressors, also known as rolling rotor compressors, have been widely used in refrigeration/heat pump systems in the fields of air conditioners, dehumidifiers, refrigerators, heating, automobiles, and the like. In these fields, multi-stage compression systems are often proposed to achieve energy-efficient, or multi-functional combinations. Compared with a multi-stage compression system realized by adopting a plurality of compressors, the multi-stage compression system has the advantages of simplicity, compactness, energy consumption concentration, low vibration noise and the like by adopting a single multi-stage compressor. Therefore, the multistage rotary compressor has wide market prospect and research requirement.
For a multi-stage rotary compressor, the exhaust gas compressed by the low-pressure stage cylinder needs to be cooled or mixed with the medium-pressure intake air at the same pressure, so that a cavity with a certain volume is needed for storing or mixing the intake air, and simultaneously, the liquid possibly carried by the intake air is separated to prevent the cylinder from liquid impact. The existing cavity structure can be divided into two types, one type is a buffer tank (liquid storage device) structure arranged outside the compressor, the other type is a middle cavity structure arranged inside the compressor, or two structures are adopted simultaneously.
For the middle cavity structure arranged inside the compressor, the compressor has the advantages of simplicity, compactness, short pipeline flow, low heat loss, high energy efficiency and the like. The middle cavity structure of the existing multistage rotary compressor only forms a simple cavity through a bearing and a cover plate and is connected with each gas inlet and outlet, and the middle cavity structure is located inside the compressor and limited in volume, so that air inflow and mixing are insufficient, a high-pressure-stage cylinder is unstable in air suction, and the energy efficiency of the compressor is reduced. Meanwhile, the middle cavity of the rotary compressor is located below the pump body, separated liquid is accumulated in the middle cavity, the gas outlet is located above the cavity, accumulated liquid cannot flow away slowly and can only accumulate more, and finally the accumulated liquid is sucked into the high-pressure-level cylinder once when the liquid level reaches a certain height, so that liquid impact is caused to the cylinder, and the reliability problem is easily caused.
Meanwhile, for a common high-backpressure two-stage rotary compressor, an oil pool at the bottom of the shell is in a high-pressure exhaust pressure state. And the back of the slip sheet in the low-pressure-level cylinder is positioned in the open oil pool, so that the front-back pressure difference of the slip sheet is large, the head of the low-pressure-level slip sheet is easily subjected to excessive friction and abrasion, the input power is large, and the energy efficiency is not high.
Therefore, a reasonable and effective design scheme is provided for the problems, and the method has great significance for improving the energy efficiency of the multistage rotary compressor and ensuring the stability and reliability of the compressor.
Disclosure of Invention
In order to overcome the problem that above-mentioned prior art exists, the utility model aims to provide a take multistage rotary compressor of top middle chamber can fully effectively mix the multichannel and admit air, and the separation is admitted air and is carried liquid, prevents excessive long-pending oil again, reduces low pressure level gleitbretter friction and wear simultaneously, improves compressor efficiency and reliability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a multi-stage rotary compressor with a top middle cavity comprises a shell 10, a motor 11 arranged in the shell 10, a compressor pump body 12 driven by the motor 11 and an oil pool 13 positioned at the bottom of the shell 10; the top of the compressor pump body 12 is provided with an intermediate cavity 20, the intermediate cavity 20 is a cavity enclosed between an upper bearing 22 and an upper bearing cover 23 of the compressor pump body 12, and the internal pressure of the shell 10 is higher than that of the intermediate cavity 20; the lower part of the upper bearing 22 is closely adjacent to a low-pressure stage cylinder 21, a lubricating oil cavity 37 is arranged in the low-pressure stage cylinder 21, and the lubricating oil cavity 37 is positioned at the back part of the low-pressure stage slide sheet 24; the lubricating oil cavity 37 is communicated with the middle cavity 20 through a low-pressure oil collecting hole 34 at the top of the lubricating oil cavity 37 and is not communicated with the oil pool 13 outside the pump body 12;
a low-pressure stage cylinder exhaust port 31, a medium-pressure gas inlet 32, a high-pressure stage cylinder suction port 33 and a low-pressure stage oil collecting hole 34 are arranged in the middle cavity 20; the low-pressure stage cylinder exhaust port 31 is arranged at the bottom of the middle cavity 20 and is connected with the low-pressure stage cylinder 21, and gas compressed by the low-pressure stage cylinder 21 is exhausted into the middle cavity 20 through the low-pressure stage cylinder exhaust port 31; the medium-pressure air inlet 32 is arranged on the side wall of the middle cavity 20 and is connected with a refrigeration or heat pump system, and medium-pressure inlet air from the refrigeration or heat pump system is discharged into the middle cavity 20 through the medium-pressure air inlet 32; the high-pressure cylinder air suction port 33 is arranged at the bottom of the middle cavity 20 and is connected with the air suction side of the high-pressure cylinder 26, and air in the middle cavity 20 is discharged out of the middle cavity 20 through the high-pressure cylinder air suction port 33; the low-pressure oil collecting hole 34 is arranged at the bottom of the middle cavity 20 and is connected with the lubricating oil cavity 37 of the low-pressure cylinder 21, and lubricating oil accumulated at the bottom of the middle cavity 20 enters the lubricating oil cavity 37 of the low-pressure cylinder 21 through the low-pressure oil collecting hole 34;
the middle cavity 20 is internally provided with one or two thin walls for dividing a flow channel, if the middle cavity is a single thin wall, the thin wall is a first thin wall 361, the first thin wall 361 extends from the side wall of the middle cavity 20 from the position between the low-pressure stage cylinder exhaust port 31 and the low-pressure stage oil collecting hole 34, and passes through the space between the low-pressure stage cylinder exhaust port 31 and the low-pressure stage oil collecting hole 34 and the space between the low-pressure stage cylinder exhaust port 31 and the high-pressure stage cylinder suction port 33, so that the first thin wall 361 is required to enable the low-pressure stage oil collecting hole 34 to be communicated with the space near the high-pressure stage cylinder suction port 33, the communicated space is effectively separated from the space near the low-pressure stage cylinder exhaust port 31, and the flow channel path from the low-pressure stage cylinder; if two, the first thin wall 361 and the second thin wall 362 are the same, the first thin wall 361 is arranged in the same way as the first thin wall 362, the second thin wall 362 extends from the side wall of the middle cavity 20 at one side of the middle pressure air inlet 32 and guides the air coming from the middle pressure air inlet 32 to flow along the side surface of the inner wall of the middle cavity, and the second thin wall 362 finally extends to the vicinity of the low pressure stage air outlet 31, so that the air inlet channel of the middle pressure air inlet 32 is connected with the space in the vicinity of the low pressure stage air outlet 31.
The first thin wall 361 and the second thin wall 362 can guide the air intake of the medium-pressure air inlet 32 to meet the air intake of the low-pressure cylinder air outlet 31, and the two paths of air intake are fully mixed and then enter the high-pressure cylinder 26 through the high-pressure cylinder air inlet 33, so that the high-pressure cylinder 26 is prevented from generating air intake fluctuation; secondly, each path of inlet air flows in a flow channel formed by a thin wall, the number of turns is more, the probability of collision with the wall surface is increased, and therefore lubricating oil and refrigerant liquid carried in the inlet air are more easily separated and converge to the bottom of the middle cavity 20 along the wall surface.
An oil collecting groove 35 is formed in the bottom of the middle cavity 20 and in a position corresponding to the low-pressure oil collecting hole 34, so that accumulated liquid at the bottom of the middle cavity 20 is preferentially gathered near the low-pressure oil collecting hole 34, the oil storage capacity of the lubricating oil cavity 37 of the low-pressure cylinder 21 is sufficient, and the oil supply of the low-pressure sliding sheet 24 is guaranteed.
The corresponding position of the high-pressure cylinder air suction port 33 is provided with a boss 38, so that the liquid storage capacity of the middle cavity 20 is further improved, and a large amount of lubricating oil which flows out of the low-pressure oil collecting hole 34 is prevented from flowing into the high-pressure cylinder air suction port 33.
The air-entraining insertion pipe 25 inserted into the middle cavity 20 from the high-pressure cylinder 26 is installed at a position corresponding to the air suction port 33 of the high-pressure cylinder, an oil hole 39 is formed in the bottom of the air-entraining insertion pipe 25, liquid is accumulated in the middle cavity 20, lubricating oil is taken as a main part, when the liquid level of the accumulated liquid is higher than the oil hole 39, the accumulated liquid can enter the air-entraining insertion pipe 25 through the oil hole 39 due to static pressure difference generated by the difference of air speeds inside and outside the oil hole 39 and potential energy provided by the height of the oil surface, and finally, the accumulated liquid is slowly and uniformly blown into the high-pressure cylinder 26, so that excessive liquid accumulated in the middle cavity 20 is avoided, and.
The working method of the multistage rotary compressor with the top middle cavity comprises the following steps: the exhaust gas of the low-pressure stage cylinder enters the middle cavity 20 from the exhaust port 31 of the low-pressure stage cylinder, the medium-pressure intake air enters the middle cavity 20 from the medium-pressure intake port 32, the two paths of intake air are fully mixed under the guidance of a flow channel constructed by the first thin wall 361 or the first thin wall 361 and the second thin wall 362, and then the two paths of intake air are discharged out of the middle cavity 20 from the air suction port 33 of the high-pressure stage cylinder through the air-entraining insertion pipe 25;
in the flowing process of the flow channel in the middle cavity, lubricating oil or liquid refrigerant carried by the exhaust gas and the medium-pressure intake air of the low-pressure stage cylinder collides against the inner wall and the first thin wall 361 of the middle cavity 20 or collides against the inner wall and the first thin wall 361 and the second thin wall 362 of the middle cavity 20, so that the lubricating oil or the liquid refrigerant is separated from the gas and collected at the bottom of the middle cavity 20; wherein the liquid refrigerant finally volatilizes into the gaseous refrigerant and is sucked into the high-pressure stage cylinder 26 by absorbing heat from the inner wall surface of the intermediate chamber 20; the lubricating oil preferentially converges to the low-pressure oil collecting hole 34 due to the high level difference, flows into the lubricating oil cavity 37 of the low-pressure cylinder 21 through the low-pressure oil collecting hole 34 and supplies oil for the low-pressure slide vane 24; if the lubricating oil in the middle cavity 20 is continuously accumulated and the liquid level rises, after the liquid level is higher than the boss 38, the lubricating oil slowly enters the air suction port 33 of the high-pressure-stage cylinder after flowing over the boss 38; or for the structure with the air-entraining inserting pipe 25, when the liquid level is higher than the oil hole 39 at the bottom of the air-entraining inserting pipe 25, the lubricating oil slowly enters the air suction port 33 of the high-pressure-stage cylinder through the oil hole 39; eventually slowly and uniformly inducting into the high pressure stage cylinder 26.
Compared with the prior art, the utility model discloses possess following advantage:
1. the utility model discloses a design runner thin wall, each way of effective guide is admitted air and is met earlier, and intensive mixing gets into the high-pressure stage again and breathes in, avoids the high-pressure stage to breathe in undulantly, improves compressor performance and reliability.
2. The utility model discloses a change low pressure level gleitbretter and supply oil chamber design method, reduce low pressure level cylinder gleitbretter back pressure to reduce low pressure level gleitbretter friction wear, promote compressor efficiency and reliability.
3. The utility model discloses a design of middle intracavity oil trap and oil collection groove has rationally utilized middle chamber accumulative lubricating oil, and effective control middle chamber liquid accumulation prevents that high-pressure stage cylinder from inhaling a large amount of liquid and causing the liquid to hit, has ensured the compressor reliability.
4. The utility model discloses a boss structure or the intubate that high-pressure level induction port corresponds the position further optimizes middle chamber stock solution ability, also further improves compressor performance and reliability.
Drawings
Fig. 1 is a sectional view of a multistage rotary compressor with a top middle chamber according to the present invention.
Fig. 2 is a schematic top view of the upper bearing of the present invention, which constitutes the middle chamber.
Fig. 3 is a schematic sectional view of a partial structure of the middle chamber and the low pressure stage cylinder according to the present invention.
Fig. 4 is a schematic cross-sectional view of the air-entraining cannula and the corresponding partial structure according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the two-stage compressor of the present invention is a sectional view.
The utility model provides a take multistage rotary compressor of top middle chamber to the two-stage compressor is the embodiment, the compressor includes: the compressor comprises a shell 10, a motor 11 arranged in the shell 10, a compressor pump body 12 driven by the motor 11 and an oil pool 13 positioned at the bottom of the shell 10. The top of the compressor pump body 12 is provided with an intermediate chamber 20. The intermediate cavity 20 is a cavity enclosed between an upper bearing 22 and an upper bearing cover 23 of the compressor pump body 12. The lower part of the upper bearing 22 is closely adjacent to the low-pressure stage cylinder 21.
The pressure inside the casing 10 of the multistage rotary compressor is higher than the pressure inside the intermediate chamber 20, wherein a high back pressure compressor is preferred.
As shown in fig. 2, the upper bearing of the middle chamber is a schematic top-view three-dimensional view.
The middle cavity 20 is internally provided with: low pressure stage cylinder exhaust port 31, intermediate pressure intake port 32, high pressure stage cylinder suction port 33, and low pressure stage oil sump hole 34. The low-pressure stage cylinder exhaust port 31 is arranged at the bottom of the middle cavity 20 and connected with the low-pressure stage cylinder 21, and gas compressed by the low-pressure stage cylinder 21 is exhausted into the middle cavity 20 through the low-pressure stage cylinder exhaust port 31. The intermediate pressure inlet 32 is provided in the side wall of the intermediate chamber 20 and is connected to a refrigeration or heat pump system, and intermediate pressure inlet air from the refrigeration or heat pump system is discharged into the intermediate chamber 20 through the intermediate pressure inlet 32. The high-pressure stage cylinder air suction port 33 is arranged at the bottom of the middle cavity 20 and is connected with the air suction side of the high-pressure stage cylinder 26, and air in the middle cavity 20 is discharged out of the middle cavity 20 through the high-pressure stage cylinder air suction port 33. The low-pressure stage oil collecting hole 34 is arranged at the bottom of the middle cavity 20 and is connected with the lubricating oil cavity 37 of the low-pressure stage cylinder 21, and lubricating oil accumulated at the bottom of the middle cavity 20 enters the lubricating oil cavity 37 of the low-pressure stage cylinder 21 through the low-pressure stage oil collecting hole 34.
An oil collecting groove 35 is formed at the bottom of the middle cavity 20 and at the position corresponding to the low-pressure oil collecting hole 34. The functions of the utility model are as follows: the accumulated liquid at the bottom of the middle cavity 20 is preferentially collected near the low-pressure stage oil collecting hole 34, so that the oil storage amount of the lubricating oil cavity 37 of the low-pressure stage cylinder 21 is sufficient, and the oil supply of the low-pressure stage slide sheet 24 is ensured.
Inside the middle cavity 20, a thin wall for dividing a flow passage is provided. The number of the thin walls is one or two, and if the number of the thin walls is one, the thin wall is a first thin wall 361, the first thin wall 361 extends from the side wall of the middle cavity 20 and extends from a position between the low-pressure stage cylinder exhaust port 31 and the low-pressure stage oil collecting hole 34, and passes through a position between the low-pressure stage cylinder exhaust port 31 and the high-pressure stage cylinder suction port 33 from a position between the low-pressure stage cylinder exhaust port 31 and the low-pressure stage oil collecting hole 34, the first thin wall 361 is required to enable the low-pressure stage oil collecting hole 34 to be communicated with a space near the high-pressure stage cylinder suction port 33, the communicated space is effectively separated from the space near the low-pressure stage cylinder exhaust port 31, and a flow passage path from the low. If two, the first thin wall 361 and the second thin wall 362 are the same, the first thin wall 361 is arranged in the same way as the first thin wall 362, the second thin wall 362 extends from the side wall of the middle cavity 20 at one side of the middle pressure air inlet 32 and guides the air coming from the middle pressure air inlet 32 to flow along the side surface of the inner wall of the middle cavity, and the second thin wall 362 finally extends to the vicinity of the low pressure stage air outlet 31, so that the air inlet channel of the middle pressure air inlet 32 is connected with the space in the vicinity of the low pressure stage air outlet 31. The first thin wall 361 and the second thin wall 362 function as: firstly, the medium-pressure air inlet 32 can be guided to meet the air inlet of the low-pressure cylinder exhaust port 31, the two paths of air are fully mixed and then enter the high-pressure cylinder 26 through the high-pressure cylinder air inlet 33, and the air suction fluctuation of the high-pressure cylinder 26 is avoided; secondly, each path of inlet air flows in a flow channel formed by a thin wall, the number of turns is more, the probability of collision with the wall surface is increased, and therefore lubricating oil and refrigerant liquid carried in the inlet air are more easily separated and converge to the bottom of the middle cavity 20 along the wall surface.
Fig. 3 is a schematic sectional view of a partial structure of the middle chamber and the low pressure stage cylinder according to the present invention.
A lubricating oil cavity 37 is formed in the low-pressure stage cylinder 21, and the lubricating oil cavity 37 is located on the back of the low-pressure stage sliding sheet 24; the lubricating oil chamber 37 is communicated with the middle chamber 20 through a low-pressure oil collecting hole 34 at the top of the lubricating oil chamber 37, and is not communicated with the oil pool 13 outside the pump body 12.
As shown in fig. 4, it is a schematic sectional view of the bleed air insertion tube and the corresponding local structure of the present invention.
The corresponding position of the high-pressure cylinder air suction port 33 is processed with a boss 38, and the function is as follows: the liquid storage capacity of the intermediate cavity 20 is further improved to prevent a large amount of lubricating oil from the low pressure stage oil collecting hole 34 from flowing into the high pressure stage cylinder suction port 33.
The corresponding position of the high-pressure stage cylinder air suction port 33 is provided with a bleed air insertion pipe 25 inserted into the middle cavity 20 from the high-pressure stage cylinder 26, and the function of the bleed air insertion pipe is the same as that of the boss 38. The bottom of the air-entraining insertion pipe 25 is processed with an oil hole 39, and the function of the air-entraining insertion pipe is as follows: for the accumulated liquid in the middle cavity 20, the lubricating oil is taken as the main part, when the accumulated liquid level is higher than the oil hole 39, due to the static pressure difference generated by the difference of the air velocities inside and outside the oil hole 39 and the potential energy provided by the oil level height, the accumulated liquid can enter the air-entraining insertion pipe 25 through the oil hole 39 and finally slowly and uniformly blow into the high-pressure-stage cylinder 26, so that the excessive accumulated liquid in the middle cavity 20 is avoided, and the phenomenon that the high-pressure-stage cylinder 26 sucks too much liquid at one time is also avoided.
The utility model discloses take multistage rotary compressor working method of top middle chamber does: the exhaust gas of the low-pressure stage cylinder enters the middle cavity 20 from the exhaust port 31 of the low-pressure stage cylinder, the medium-pressure intake air enters the middle cavity 20 from the medium-pressure intake port 32, the two paths of intake air are fully mixed under the guidance of a flow passage constructed by the first thin wall 361 or the first thin wall 361 and the second thin wall 362, and then the two paths of intake air are discharged out of the middle cavity 20 from the air inlet 33 of the high-pressure stage cylinder through the air-entraining inserting pipe 25.
In the flowing process of the flow channel in the middle chamber, the lubricating oil or the liquid refrigerant carried by the low-pressure stage cylinder exhaust gas and the medium-pressure intake gas collides against the inner wall of the middle chamber 20 and the first thin wall 361 or the inner wall of the middle chamber 20 and the first thin wall 361 and the second thin wall 362, so that the lubricating oil or the liquid refrigerant is separated from the gas and collected at the bottom of the middle chamber 20. Wherein the liquid refrigerant finally volatilizes into the gaseous refrigerant and is sucked into the high-pressure stage cylinder 26 by absorbing heat from the inner wall surface of the intermediate chamber 20; the lubricating oil preferentially converges to the low-pressure oil collecting hole 34 due to the high level difference, flows into the lubricating oil cavity 37 of the low-pressure cylinder 21 through the low-pressure oil collecting hole 34 and supplies oil for the low-pressure slide vane 24; if the lubricating oil in the middle cavity 20 is continuously accumulated and the liquid level rises, after the liquid level is higher than the boss 38, the lubricating oil slowly enters the air suction port 33 of the high-pressure-stage cylinder after flowing over the boss 38; or for the structure with the air-entraining inserting pipe 25, when the liquid level is higher than the oil hole 39 at the bottom of the air-entraining inserting pipe 25, the lubricating oil slowly enters the air suction port 33 of the high-pressure-stage cylinder through the oil hole 39; eventually slowly and uniformly inducting into the high pressure stage cylinder 26.
Claims (4)
1. A multistage rotary compressor with a top middle cavity comprises a shell (10), a motor (11) arranged in the shell (10), a compressor pump body (12) driven by the motor (11) and an oil pool (13) positioned at the bottom of the shell (10); the method is characterized in that: the top of the compressor pump body (12) is provided with a middle cavity (20), the middle cavity (20) is a cavity enclosed between an upper bearing (22) and an upper bearing cover (23) of the compressor pump body (12), and the internal pressure of the shell (10) is higher than that of the middle cavity (20); the lower part of the upper bearing (22) is closely adjacent to a low-pressure-level cylinder (21), a lubricating oil cavity (37) is arranged in the low-pressure-level cylinder (21), and the lubricating oil cavity (37) is positioned at the back of the low-pressure-level slip sheet (24); the lubricating oil cavity (37) is communicated with the middle cavity (20) through a low-pressure oil collecting hole (34) at the top of the lubricating oil cavity (37) and is not communicated with an oil pool (13) outside the pump body (12);
a low-pressure stage cylinder exhaust port (31), a medium-pressure air inlet (32), a high-pressure stage cylinder air suction port (33) and a low-pressure stage oil collecting hole (34) are arranged in the middle cavity (20); the exhaust port (31) of the low-pressure stage cylinder is arranged at the bottom of the middle cavity (20) and is connected with the low-pressure stage cylinder (21), and gas compressed by the low-pressure stage cylinder (21) is exhausted into the middle cavity (20) through the exhaust port (31) of the low-pressure stage cylinder; the medium-pressure air inlet (32) is arranged on the side wall of the middle cavity (20) and is connected with a refrigeration or heat pump system, and medium-pressure inlet air from the refrigeration or heat pump system is discharged into the middle cavity (20) through the medium-pressure air inlet (32); the high-pressure cylinder air suction port (33) is arranged at the bottom of the middle cavity (20) and is connected with the air suction side of the high-pressure cylinder (26), and air in the middle cavity (20) is discharged out of the middle cavity (20) through the high-pressure cylinder air suction port (33); the low-pressure oil collecting hole (34) is formed in the bottom of the middle cavity (20) and is connected with a lubricating oil cavity (37) of the low-pressure cylinder (21), and lubricating oil accumulated at the bottom of the middle cavity (20) enters the lubricating oil cavity (37) of the low-pressure cylinder (21) through the low-pressure oil collecting hole (34);
the middle cavity (20) is internally provided with one or two thin walls for dividing a flow channel, if the middle cavity is provided with one thin wall, the thin wall is a first thin wall (361), the first thin wall (361) extends from the side wall of the middle cavity (20) to the position between the low-pressure stage cylinder exhaust port (31) and the low-pressure stage oil collecting hole (34), and passes through the space between the low-pressure stage cylinder exhaust port (31) and the low-pressure stage oil collecting hole (34) and between the low-pressure stage cylinder exhaust port (31) and the high-pressure stage cylinder air suction port (33), the first thin wall (361) is required to enable the low-pressure stage oil collecting hole (34) to be communicated with the space near the high-pressure stage cylinder air suction port (33), the communicated space is effectively separated from the space near the low-pressure stage cylinder exhaust port (31), and the flow channel path from the low-pressure stage cylinder exhaust port (31) to the high-; if the number of the first thin wall (361) is two, the first thin wall (361) and the second thin wall (362) are arranged in the same way when the number of the first thin wall (361) is one, the second thin wall (362) extends from the side wall of the middle cavity (20) and is positioned at one side of the middle pressure air inlet (32) and guides air entering from the middle pressure air inlet (32) to flow along the side surface of the inner wall of the middle cavity, and finally the second thin wall (362) extends to the vicinity of the low pressure stage cylinder exhaust port (31), so that the air inlet flow passage of the middle pressure air inlet (32) is connected with the space in the vicinity of the low pressure stage cylinder exhaust port (31).
2. The multi-stage rotary compressor with a top intermediate chamber according to claim 1, characterized in that: the bottom of the middle cavity (20) and the corresponding position of the low-pressure oil collecting hole (34) are provided with oil collecting grooves (35) so that accumulated liquid at the bottom of the middle cavity (20) is preferentially collected near the low-pressure oil collecting hole (34).
3. The multi-stage rotary compressor with a top intermediate chamber according to claim 1, characterized in that: and a boss (38) is machined at a position corresponding to the high-pressure cylinder air suction port (33).
4. The multi-stage rotary compressor with a top intermediate chamber according to claim 1, characterized in that: the air-entraining insertion pipe (25) inserted into the middle cavity (20) from the high-pressure cylinder (26) is installed at a position corresponding to the air-entraining port (33) of the high-pressure cylinder, and an oil hole (39) is machined at the bottom of the air-entraining insertion pipe (25).
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| CN201920780732.5U CN209943099U (en) | 2019-05-28 | 2019-05-28 | Multistage rotary compressor with top middle cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056507A (en) * | 2019-05-28 | 2019-07-26 | 西安交通大学 | A kind of multi-stage rotary compressor and working method with top center chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056507A (en) * | 2019-05-28 | 2019-07-26 | 西安交通大学 | A kind of multi-stage rotary compressor and working method with top center chamber |
| CN110056507B (en) * | 2019-05-28 | 2023-08-01 | 西安交通大学 | Multistage rotary compressor with top middle cavity and working method |
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