CN210087607U - Multistage rotary compressor with bottom middle cavity - Google Patents
Multistage rotary compressor with bottom middle cavity Download PDFInfo
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- CN210087607U CN210087607U CN201920780731.0U CN201920780731U CN210087607U CN 210087607 U CN210087607 U CN 210087607U CN 201920780731 U CN201920780731 U CN 201920780731U CN 210087607 U CN210087607 U CN 210087607U
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Abstract
A multi-stage rotary compressor with a bottom middle cavity is provided, wherein the bottom of a compressor pump body of the compressor is provided with the middle cavity, and the middle cavity is a cavity enclosed between a lower bearing and a lower bearing cover of the compressor pump body; the middle cavity is internally provided with a low-pressure cylinder exhaust port, a medium-pressure air inlet and a high-pressure cylinder air suction port, the middle cavity is internally provided with one or two thin walls for dividing a flow channel, and the thin walls can effectively separate the space near the low-pressure cylinder exhaust port and the high-pressure cylinder air suction port and prolong the flow channel path from the low-pressure cylinder exhaust port to the high-pressure cylinder air suction port; an air-entraining insertion pipe which is connected with the high-pressure cylinder and is used for introducing accumulated liquid in the middle cavity into the high-pressure cylinder is inserted into an air suction port of the high-pressure cylinder in the middle cavity; the utility model discloses can fully effectively mix the multichannel and admit air, the separation is admitted air and is carried liquid, effectively takes away the hydrops simultaneously, improves compressor efficiency and reliability.
Description
Technical Field
The utility model relates to a multistage rotary compressor, concretely relates to take multistage rotary compressor in middle chamber of bottom 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 system which adopts a plurality of compressors to realize multistage compression, the system which adopts a single multistage compressor has the advantages of simplicity, compactness, concentrated energy consumption, low vibration noise and the like. 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, for the middle cavity below the pump body, separated liquid is accumulated in the middle cavity, and the gas outlet is located above the cavity, so that accumulated liquid cannot slowly flow away, the accumulated liquid is increased, and finally the liquid is sucked into the high-pressure-level cylinder once when the liquid level reaches a certain height, so that liquid impact is caused on the cylinder, and the reliability problem is easily caused. For example, in patent CN1046322626A and CN108843573A, the pressure fluctuation of the middle chamber is suppressed by the design of dual middle chambers, but the problem of liquid accumulation in the middle chamber at the bottom of the pump body is not considered.
Therefore, in a limited space, a reasonable and effective design scheme of the middle cavity is provided, and the design scheme 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 problems existing in the prior art, the utility model aims to provide a take multistage rotary compressor of bottom middle chamber can fully effectively mix the multichannel and admit air, and the separation is admitted air and is carried liquid, effectively takes away the hydrops 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 bottom middle cavity comprises a shell 10, a motor 11 arranged in the shell 10 and a compressor pump body 12 driven by the motor 11; the bottom of the compressor pump body 12 is provided with an intermediate cavity 20, and the intermediate cavity 20 is a cavity enclosed between a lower bearing 21 and a lower bearing cover 22 of the compressor pump body 12;
a low-pressure-stage cylinder exhaust port 31, a medium-pressure air inlet 32 and a high-pressure-stage cylinder air inlet 33 are arranged in the middle cavity 20, the low-pressure-stage cylinder exhaust port 31 is arranged on the top wall surface of the middle cavity 20 and connected with the low-pressure-stage cylinder 23, and gas compressed by the low-pressure-stage cylinder 23 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 on the wall surface of the top of the middle cavity 20 and is connected with the air suction side of the high-pressure cylinder 24, and the air in the middle cavity 20 is discharged out of the middle cavity 20 through the high-pressure cylinder air suction port 33;
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 341, the first thin wall 341 extends from the side wall of the middle cavity 20 to the position between the low-pressure cylinder exhaust port 31 and the high-pressure cylinder air suction port 33 and passes through the space between the low-pressure cylinder exhaust port 31 and the high-pressure cylinder air suction port 33, and the first thin wall 341 is required to be capable of effectively separating the space near the low-pressure cylinder exhaust port 31 and the high-pressure cylinder air suction port 33 and prolonging the flow channel path from the low-pressure cylinder exhaust port 31 to the high-pressure cylinder air suction port 33; if two, the first thin wall 341 and the second thin wall 342 are provided in the same manner, the second thin wall 342 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 342 finally extends to the vicinity of the low pressure stage air 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 air cylinder exhaust port 31; and a gas-guiding insertion pipe 25 connected with the high-pressure-stage cylinder 24 and used for introducing accumulated liquid in the middle cavity 20 into the high-pressure-stage cylinder 24 is inserted into a high-pressure-stage cylinder suction port 33 of the middle cavity 20.
The first thin wall 341 and the second thin wall 342 can guide the intake air of the medium-pressure air inlet 32 to meet the intake air of the low-pressure cylinder exhaust port 31, and the two paths of intake air are fully mixed and then enter the high-pressure cylinder 24 through the high-pressure cylinder intake port 33, so that the high-pressure cylinder 24 is prevented from generating intake fluctuation; secondly, each path of inlet air flows in a flow channel formed by thin walls, the number of turns is more, the probability of collision with the wall surface of the middle cavity 20 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, namely the top of the lower bearing housing 22, along the wall surface of the middle cavity 20.
The bottom of the air-entraining cannula 25 extends to the top of the lower bearing cover 22, and a small hole 35 is formed in the bottom of the air-entraining cannula 25; for the accumulated liquid in the middle cavity 20, when the accumulated liquid level is not high, the accumulated liquid can enter the air-entraining insertion pipe 25 through the small hole 35 at the bottom of the air-entraining insertion pipe 25 due to static pressure difference generated by the difference of the air velocities inside and outside the small hole 35 and potential energy provided by the height of the oil level, and then the accumulated liquid is slowly and uniformly blown into the high-pressure cylinder 24 under the action of the higher air velocity in the air-entraining insertion pipe 25, so that the excessive accumulated liquid in the middle cavity 20 is avoided, the phenomenon that the high-pressure cylinder sucks too much liquid at one time is also avoided, and.
The bottom of the middle cavity 20 is the top of the lower bearing cover 22, and a groove 36 is formed in the lower bearing cover 22 at the position corresponding to the air-entraining cannula 25; so that the effusion at the bottom of the middle cavity 20 is preferentially collected near the bottom of the air-entraining cannula 25, which is beneficial for the small holes 35 at the bottom of the air-entraining cannula to suck the effusion as soon as possible, thereby controlling the total effusion quantity of the middle cavity to be less.
The number of the small holes 35 formed in the air-entraining cannula 25 is 1-5; total area A of said apertures 35hCross-sectional flow area A of the air-entraining cannula 25pSatisfies the following conditions: a is more than or equal to 0.02h/ApLess than or equal to 0.2; by arranging the small holes 35, a certain height difference exists between the small holes 35, so that if the height of the accumulated liquid is higher, the more liquid flows into the air-entraining insertion pipe 25, and the balance is easier to achieve; by limiting the opening area of the bottom of the air-entraining inserting pipe 25, the liquid quantity sucked into the high-pressure cylinder from the small hole 35 is ensured to be within the bearable range of the high-pressure cylinder, the phenomenon that excessive liquid is sucked instantly is avoided, the sucking process is more uniform, and the reliability is guaranteed.
The air-entraining cannula 25 is an L-shaped cannula, a U-shaped notch 37 is cut at the bottom of the cannula, and the cutting surface is tightly attached to the top of the lower bearing cover 22.
The working method of the multistage rotary compressor with the bottom 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 gas enters the middle cavity 20 from the medium-pressure intake port 32, and the two paths of intake gas are firstly fully mixed under the guidance of a flow passage constructed by the first thin wall 341 or the first thin wall 341 and the second thin wall 342 and then discharged from the high-pressure stage suction port through the air-entraining inserting pipe 25;
lubricating oil or liquid refrigerant carried by the exhaust gas of the low-pressure stage cylinder and the medium-pressure intake air collides with the inner wall of the middle cavity 20 and the first thin wall 341 or the first thin wall 341 and the second thin wall 342 in the flowing process of the flow channel in the middle cavity, 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 absorbs heat from the inner wall surface of the intermediate chamber 20, and finally volatilizes into a gaseous refrigerant and is sucked into the high-pressure stage cylinder 24; the lubricating oil converges to the groove 36 below the air-entraining insertion tube 25 and seeps into the air-entraining insertion tube 25 under the action of the small hole 35 and the air suction flow rate; or for the L-shaped bleed air insertion pipe 25, the lubricating oil is converged to the position near the U-shaped notch 37 at the bottom of the bleed air insertion pipe 25, and is blown into the bleed air insertion pipe 35 under the action of the inner slope surface of the bleed air insertion pipe 25 and the air flow speed, and finally is slowly and uniformly sucked into the high-pressure-stage cylinder 24.
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 an adopt bleed intubate and intubate bottom trompil/cut a mouthful isotructure, can absorb the middle chamber hydrops to bearing housing processing recess gathering liquid has avoided the middle chamber hydrops too much under, and high-pressure level is once inhaled and is caused the liquid to hit, ensures the reliability.
3. The utility model discloses injecing intubate bottom trompil quantity and area, guaranteeing that the middle chamber hydrops siphons away the process slowly even, can not produce the instantaneous excessive hydrops of inhaling and cause the liquid to hit, guarantee the reliability.
4. The utility model discloses can prevent that lubricating oil from excessively accumulating in middle intracavity, do benefit to and maintain compressor working oil level stable, the fuel feeding of guarantee compressor.
Drawings
Fig. 1 is a cross-sectional view of the two-stage compressor of the present invention.
Fig. 2 is a bottom three-dimensional schematic view of the lower bearing forming the middle chamber of the present invention.
Fig. 3 is a sectional view of the structure of the middle cavity air-entraining cannula of the present invention.
Fig. 4a and 4b are schematic diagrams of the "L-shaped" cannula of the present invention in cross section and top view, respectively.
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 is shown in cross-section.
The utility model provides a take multistage rotary compressor of bottom middle chamber to the two-stage compressor is the embodiment, the compressor includes: a housing 10, a motor 11 disposed within the housing 10, and a compressor pump body 12 driven by the motor 11. The bottom of the compressor pump body 12 is provided with an intermediate cavity 20. The intermediate cavity 20 is a cavity enclosed between a lower bearing 21 and a lower bearing housing 22 of the compressor pump body 12.
Fig. 2 is a bottom three-dimensional schematic view of the lower bearing forming the middle chamber of the present invention, i.e., a view of fig. 1 taken along the direction a with the lower bearing cap 22 removed.
The middle cavity 20 is internally provided with: a low pressure stage cylinder exhaust port 31, an intermediate pressure intake port 32, and a high pressure stage cylinder intake port 33. The low-pressure stage cylinder exhaust port 31 is provided on the top wall surface of the intermediate chamber 20, and is connected to the low-pressure stage cylinder 23, and the gas compressed by the low-pressure stage cylinder 23 is discharged into the intermediate chamber 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 inlet 33 is arranged on the top wall surface of the middle cavity 20 and is connected with the air suction side of the high-pressure stage cylinder 24, and the air in the middle cavity 20 is discharged out of the middle cavity 20 through the high-pressure stage cylinder air inlet 33.
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 the first thin wall 341, the first thin wall 341 extends from the side wall of the middle cavity 20, extends from the position between the low-pressure stage cylinder exhaust port 31 and the high-pressure stage cylinder air suction port 33, and passes through the position between the low-pressure stage cylinder exhaust port 31 and the high-pressure stage cylinder air suction port 33, so that the first thin wall 341 is required to effectively separate the space near the low-pressure stage cylinder exhaust port 31 and the high-pressure stage cylinder air suction port 33, and the flow passage path from the low-pressure stage cylinder exhaust port 31 to the. If two, the first thin wall 341 and the second thin wall 342 are provided in the same manner, the second thin wall 342 extends from the side wall of the intermediate chamber 20 at the side of the intermediate pressure air inlet 32 and guides the air coming from the intermediate pressure air inlet 32 to flow along the side surface of the inner wall of the intermediate chamber, and the second thin wall 342 finally extends to the vicinity of the low pressure stage air cylinder exhaust port 31, so that the air inlet flow passage of the intermediate pressure air inlet 32 is connected with the space in the vicinity of the low pressure stage air cylinder exhaust port 31. The first thin wall 341 and the second thin wall 342 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 24 through the high-pressure cylinder air inlet 33, and the air suction fluctuation of the high-pressure cylinder 24 is avoided; secondly, each path of inlet air flows in a flow channel formed by thin walls, the number of turns is more, the probability of collision with the wall surface of the middle cavity 20 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, namely the top of the lower bearing housing 22, along the wall surface of the middle cavity 20.
As shown in fig. 3, the cross-sectional view of the middle cavity air-entraining cannula structure of the present invention is shown.
A bleed air insertion pipe 25 is inserted into a high-pressure cylinder air suction port 33 of the middle cavity 20, the bottom of the bleed air insertion pipe 25 extends to the top of the lower bearing housing 22, and a small hole 35 is formed in the bottom of the bleed air insertion pipe 25. The functions of the utility model are as follows: for the accumulated liquid in the middle cavity 20, the lubricating oil is taken as the main material, when the accumulated liquid level is not high, the accumulated liquid enters the air-entraining inserting pipe 25 through the small hole 35 at the bottom of the air-entraining inserting pipe 25 due to the static pressure difference generated by the difference of the air velocities inside and outside the small hole 35 and the potential energy provided by the height of the oil level, and then the accumulated liquid is slowly and uniformly blown into the high-pressure-stage air cylinder 24 under the action of the higher air velocity in the air-entraining inserting pipe 25, so that the excessive accumulated liquid in the middle cavity 20 is avoided, the excessive liquid sucked by the high-pressure stage at.
The bottom of the middle cavity 20 is the top of the lower bearing housing 22, and a groove 36 is formed on the lower bearing housing 22 at the position corresponding to the air-entraining cannula 25. The functions of the utility model are as follows: the effusion at the bottom of the middle cavity 20 is preferentially collected near the bottom of the air-entraining cannula 25, so that the effusion can be sucked by the small holes 35 at the bottom of the air-entraining cannula as soon as possible, and the total effusion quantity of the middle cavity is controlled to be less.
The number of the small holes 35 formed in the air-entraining cannula 25 is 1-5; total area A of said apertures 35hCross-sectional flow area A of the air-entraining cannula 25pSatisfies the following conditions: a is more than or equal to 0.02h/ApLess than or equal to 0.2. The function of the device is that a certain height difference can be formed between the small holes 35 by arranging the small holes 35, so that if the height of the accumulated liquid is higher, the more liquid flows into the air-entraining insertion pipe 25, and the balance is easier to achieve; by limiting the open area at the bottom of the bleed air cannula 25, this is assuredThe liquid quantity sucked into the high-pressure cylinder from the small hole 35 is kept within the bearable range of the high-pressure cylinder, so that excessive liquid is prevented from being sucked instantly, the sucking process is more uniform, and the reliability is guaranteed.
Fig. 4a and 4b are schematic side cross-sectional and bottom views of an "L-shaped" bleed air cannula 25 of the present invention.
The air-entraining cannula 25 is an L-shaped cannula, a U-shaped notch 37 is cut at the bottom of the cannula, and the cutting surface is tightly attached to the top of the lower bearing cover 22. The other intubation scheme has the similar function as the former intubation, and has the advantages of simple processing and effective cost control.
The utility model provides a middle chamber 20 structure is preferred to be applied to the multistage rotary compressor of high back pressure, or the multistage rotary compressor that casing pressure is higher than middle chamber 20 internal pressure. Because, with this type of rotary compressor, the lubricant oil accumulated inside the intermediate chamber 20 cannot slowly seep out through the gap between the lower bearing 21 and the lower bearing housing 22 under the action of the pressure difference, and enters the oil sump at the bottom of the casing 10. Therefore, for the existing middle cavity structure without the air-entraining inserting pipe 25, the more the lubricating oil in the middle cavity 20 will accumulate until the oil level reaches a certain height, a large amount of lubricating oil is sucked into the high-pressure-stage cylinder at a moment, and the stability and reliability of the system and the compressor are seriously threatened.
The utility model discloses take multistage rotary compressor's of bottom intermediate chamber working method 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, and the two paths of intake air are firstly fully mixed under the guidance of a flow passage constructed by the first thin wall 341 or the first thin wall 341 and the second thin wall 342 and then are discharged from the high-pressure stage air suction port through the air-entraining inserting pipe 25.
The lubricating oil or liquid refrigerant carried by the low-pressure stage cylinder exhaust gas and the medium-pressure intake gas collides with the inner wall of the intermediate chamber 20 and the first thin wall 341 or the first thin wall 341 and the second thin wall 342 in the flowing process of the flow passage in the intermediate chamber, so that the lubricating oil or liquid refrigerant is separated from the gas and collected at the bottom of the intermediate chamber 20. Wherein the liquid refrigerant absorbs heat from the inner wall surface of the intermediate chamber 20, and finally volatilizes into a gaseous refrigerant and is sucked into the high-pressure stage cylinder 24; the lubricating oil converges to the groove 36 below the air-entraining insertion tube 25 and seeps into the air-entraining insertion tube 25 under the action of the small hole 35 and the air suction flow rate; or for the L-shaped air-entraining insertion pipe 25, the lubricating oil converges to the vicinity of a U-shaped opening 37 at the bottom of the air-entraining insertion pipe 25 and is blown into the air-entraining insertion pipe 35 under the action of the inner slope surface of the air-entraining insertion pipe 25 and the air flow speed; eventually slowly and uniformly inducting into the high pressure stage cylinder 24.
Claims (5)
1. A multi-stage rotary compressor with a bottom middle cavity comprises a shell (10), a motor (11) arranged in the shell (10) and a compressor pump body (12) driven by the motor (11); the method is characterized in that: the bottom of the compressor pump body (12) is provided with a middle cavity (20), and the middle cavity (20) is a cavity enclosed between a lower bearing (21) and a lower bearing cover (22) of the compressor pump body (12);
a low-pressure stage cylinder exhaust port (31), a medium-pressure air inlet (32) and a high-pressure stage cylinder air suction port (33) are arranged in the middle cavity (20), the low-pressure stage cylinder exhaust port (31) is arranged on the top wall surface of the middle cavity (20) and connected with the low-pressure stage cylinder (23), and gas compressed by the low-pressure stage cylinder (23) is discharged 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 on the top wall surface of the middle cavity (20) and is connected with the air suction side of the high-pressure cylinder (24), 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 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 (341), the first thin wall (341) extends from the side wall of the middle cavity (20) to the position between the low-pressure-stage cylinder exhaust port (31) and the high-pressure-stage cylinder air suction port (33) and penetrates through the space between the low-pressure-stage cylinder exhaust port (31) and the high-pressure-stage cylinder air suction port (33), and the first thin wall (341) is required to effectively separate the space near the low-pressure-stage cylinder exhaust port (31) and the high-pressure-stage cylinder air suction port (33) and prolong the flow channel path from the low-pressure-stage cylinder exhaust port (31) to the high-pressure-stage; if the number of the two thin walls is two, the thin wall is a first thin wall (341) and a second thin wall (342), the arrangement mode of the first thin wall (341) is the same as that of the second thin wall (342), the second thin wall (342) 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 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 (342) finally extends to the vicinity of the low pressure stage air 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; and a gas-guiding insertion pipe (25) which is connected with the high-pressure cylinder (24) and is used for introducing accumulated liquid in the middle cavity (20) into the high-pressure cylinder (24) is inserted into a high-pressure cylinder suction port (33) of the middle cavity (20).
2. The multi-stage rotary compressor with a bottom intermediate chamber according to claim 1, characterized in that: the bottom of the air-entraining inserting pipe (25) extends to the top of the lower bearing cover (22), and a small hole (35) is formed in the bottom of the air-entraining inserting pipe (25).
3. The multi-stage rotary compressor with a bottom intermediate chamber according to claim 2, characterized in that: the bottom of the middle cavity (20) is the top of the lower bearing cover (22), and a groove (36) is formed in the lower bearing cover (22) at the position corresponding to the air-entraining inserting pipe (25) so that effusion at the bottom of the middle cavity (20) is preferentially collected near the bottom of the air-entraining inserting pipe (25).
4. The multi-stage rotary compressor with a bottom intermediate chamber according to claim 2, characterized in that: the number of the small holes (35) formed in the air-entraining cannula (25) is 1-5; the total area A of the small holes (35)hA cross-sectional flow area A with the air-entraining cannula (25)pSatisfies the following conditions: a is more than or equal to 0.02h/Ap≤0.2。
5. The multi-stage rotary compressor with a bottom intermediate chamber according to claim 1, characterized in that: the air-entraining cannula (25) is an L-shaped cannula, a U-shaped notch (37) is cut at the bottom of the cannula, and the cutting surface is closely attached to the top of the lower bearing cover (22).
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| CN201920780731.0U CN210087607U (en) | 2019-05-28 | 2019-05-28 | Multistage rotary compressor with bottom middle cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043466A (en) * | 2019-05-28 | 2019-07-23 | 西安交通大学 | A kind of multi-stage rotary compressor and working method with bottom intermediate cavity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043466A (en) * | 2019-05-28 | 2019-07-23 | 西安交通大学 | A kind of multi-stage rotary compressor and working method with bottom intermediate cavity |
| CN110043466B (en) * | 2019-05-28 | 2023-07-18 | 西安交通大学 | Multistage rotary compressor with bottom middle cavity and working method |
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