Air suspension high speed centrifugal compressor

Abstract

The application discloses an air-suspension high-speed centrifugal compressor and relates to the technical field of compressors. The air-suspension high-speed centrifugal compressor comprises a shell, a stator, a rotor main shaft, a volute and an impeller, the stator is arranged in the shell, the volute is arranged at one end of the shell, the impeller is located in the volute, radial dynamic pressure air bearings and thrust dynamic pressure air bearings are arranged in the shell, the rotor main shaft is rotatably arranged in the shell through the radial dynamic pressure air bearings and the thrust dynamic pressure air bearings, one end of the rotor main shaft is fixedly connected with the impeller, and the other end of the rotor main shaft is cantilevered in the inner cavity of the stator. The air-suspension high-speed centrifugal compressor shortens the shafting, makes the structure of the equipment more simple and compact, improves the stability and impact resistance of the equipment in operation, and reduces the weight of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to an air suspension high-speed centrifugal compressor. BACKGROUND

[0002] The centrifugal compressor is widely used in the industries of textile, pneumatic tool, part detection, spraying, inflation and fuel cell.

[0003] The centrifugal compressor is a power compressor with high-speed rotating impeller, which relies on the interaction force between the rotating impeller and the airflow to improve the pressure of the gas, and the airflow generates acceleration to obtain kinetic energy, and then the kinetic energy is converted into pressure energy in the diffuser to further improve the pressure, and the flow of the gas is continuous in the compression process.

[0004] However, the existing centrifugal compressor has complex structure, long shaft system, weak impact resistance, and poor working stability, which cannot meet the market demand. SUMMARY

[0005] In view of the above defects of the prior art, the present application provides an air suspension high-speed centrifugal compressor, which has simple and compact structure, short shaft system and high working stability.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is:

[0007] The air suspension high-speed centrifugal compressor comprises a shell, a stator, a rotor main shaft, a volute and an impeller, the stator is arranged in the shell, the volute is arranged at one end of the shell, the impeller is located in the volute, a radial dynamic pressure air bearing and a thrust dynamic pressure air bearing are arranged in the shell, the rotor main shaft is rotatably arranged in the shell through the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing, one end of the rotor main shaft is fixedly connected with the impeller, and the other end of the rotor main shaft overhangs in the inner cavity of the stator.

[0008] Among them, a first bearing seat is arranged in the shell, a shaft sleeve is arranged on the first bearing seat, the rotor main shaft is rotatably arranged in the shaft sleeve, a plurality of first dynamic pressure grooves for air inflow are circumferentially arranged at the position corresponding to the shaft sleeve of the rotor main shaft, and the shaft sleeve and the rotor main shaft jointly constitute the radial dynamic pressure air bearing.

[0009] Among them, the first dynamic pressure groove is a herringbone groove, and each first dynamic pressure groove is uniformly distributed along the circumference of the rotor main shaft.

[0010] The shell is internally provided with a second bearing seat, which is located between the first bearing seat and the volute; the rotor main shaft is provided with a thrust piece, which is located between the first bearing seat and the second bearing seat, and each side of the thrust piece close to the first bearing seat and the second bearing seat is provided with a plurality of second dynamic pressure grooves for air inflow, and the end face of the first bearing seat, the thrust piece and the end face of the second bearing seat jointly constitute the thrust dynamic pressure air bearing.

[0011] The second dynamic pressure groove is a circular arc groove, and each side of the second dynamic pressure groove is distributed in a spiral shape with the axis of the thrust piece as the central axis.

[0012] The shell includes a cylinder with two open ends and an end cover arranged at one end of the cylinder, and the stator is arranged in the cylinder and located between the end cover and the first bearing seat.

[0013] The air suspension high-speed centrifugal compressor is provided with a water cooling structure, which includes:

[0014] A plurality of end cover water channel grooves are arranged on the end cover, and one of the end cover water channel grooves is provided with a water inlet and a water outlet;

[0015] A plurality of water channel groups are arranged on the cylinder, and each water channel group includes a water inlet channel and a water return channel parallel to the axial direction of the cylinder;

[0016] and a plurality of bearing seat water channel grooves are arranged on the first bearing seat;

[0017] The number of the end cover water channel grooves, the water channel groups and the bearing seat water channel grooves is equal, the end cover water channel grooves correspond to the water channel groups one by one, each end cover water channel groove is in communication with the water inlet channel and the water return channel of the same water channel group, and the water inlet channel and the water return channel of the same water channel group are in communication with two adjacent bearing seat water channel grooves.

[0018] The air suspension high-speed centrifugal compressor is provided with an air cooling structure, which includes a bearing seat air channel arranged on the first bearing seat, a shaft sleeve air channel arranged on the shaft sleeve, and an exhaust port arranged on the end cover, and the air inlet of the volute, the bearing seat air channel, the shaft sleeve air channel and the exhaust port are in communication.

[0019] The volute is internally provided with a self-circulation machine case processing structure, the self-circulation machine case processing structure comprises a flow guide part protruding on the inner wall of the volute, and an air inlet cylinder arranged on the inner wall of the volute through a connecting rib, the flow guide part, the air inlet cylinder and the volute jointly enclose an air inlet groove, and the flow guide part and the air inlet cylinder form a self-circulation air channel that communicates the air inlet groove and the inner cavity of the air inlet cylinder.

[0020] The air inlet is provided with a conical flow guide cover.

[0021] The above technical scheme has the beneficial effects of the present application:

[0022] The air suspension high-speed centrifugal compressor provided by the present application has the following advantages: the rotor main shaft is arranged in the shell through the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing, one end of the rotor main shaft is fixedly connected with the impeller, and the other end of the rotor main shaft is overhanging in the inner cavity of the stator, that is, one end of the rotor main shaft and the impeller are respectively overhanging on the two sides of the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing, the impeller is driven to rotate at high speed by the rotor main shaft, air is used as the lubricant and coolant, and continuous high-pressure gas is output, the overhanging structure shortens the shafting, makes the structure of the equipment more simple and compact, improves the stability and impact resistance of the equipment, and reduces the weight of the equipment, the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing use air as the lubricant and coolant for the rotation of the rotor main shaft, compared with the prior art, the noise of the equipment is reduced, the reliability of the equipment is improved, and the service life of the equipment is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the air suspension high-speed centrifugal compressor of the present application;

[0024] Figure 2 is a side view of Figure 1 ;

[0025] Figure 3 is a partial structural schematic view of the rotor main shaft in the figure;

[0026] Figure 4 is a structural schematic view of the thrust receiving piece;

[0027] Figure 5 is a structural view of Figure 1 ;

[0028] Figure 6 is a structural view of the other side; Figure 5

[0029] ​In the figure: 1-end cover, 11-end cover water channel groove, 12-water inlet, 13-water outlet, 14-air outlet, 15-water inlet pipe, 16-water outlet pipe, 2-cylinder, 21-water inlet channel, 22-backwater channel, 3-first bearing seat, 31-bearing seat water channel groove, 32-bearing seat air channel, 4-shaft sleeve, 41-shaft sleeve air channel, 5-stator, 6-rotor main shaft, 61-first dynamic pressure groove, 7-thrust piece, 71-second dynamic pressure groove, 8-second bearing seat, 9-volute, 91-air inlet, 92-flow guide part, 93-connection rib, 94-air inlet cylinder, 95-air inlet groove, 96-self-circulation air channel, 97-flow guide cover, 98-air outlet, 10-impeller, 17-pressing block. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0031] As Figures 1 to 6 As shown in the drawings, the air suspension high-speed centrifugal compressor comprises a shell, a stator 5, a rotor main shaft 6, a volute 9 and an impeller 10, the stator 5 is arranged in the shell, the volute 9 is arranged at one end of the shell, the impeller 10 is located in the volute 9, the shell is provided with a radial dynamic pressure air bearing and a thrust dynamic pressure air bearing, the rotor main shaft 6 is rotatably arranged in the shell through the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing, one end of the rotor main shaft 6 is fixedly connected with the impeller 10, and the other end of the rotor main shaft 6 overhangs in the inner cavity of the stator 5.

[0032] By overhanging one end of the rotor main shaft 6 and the impeller 10 on both sides of the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing respectively, the shafting is shortened, which not only makes the structure of the equipment more simple and compact, improves the stability and impact resistance of the equipment in operation, but also reduces the weight of the equipment.

[0033] The shell comprises a cylinder 2 with two open ends and an end cover 1 arranged at one end of the cylinder 2, the cylinder 2 is provided with a first bearing seat 3, and the stator 5 is arranged in the cylinder 2 and located between the end cover 1 and the first bearing seat 3.

[0034] The first bearing seat 3 in the embodiment is provided with a shaft sleeve 4, the rotor main shaft 6 is rotatably arranged in the shaft sleeve 4, and a plurality of first dynamic pressure grooves 61 for air inflow are circumferentially arranged at the position of the rotor main shaft 6 corresponding to the shaft sleeve 4, and the shaft sleeve 4 and the rotor main shaft 6 jointly constitute the radial dynamic pressure air bearing. In actual application, the first dynamic pressure grooves 61 can also be arranged on the inner surface of the shaft sleeve 4, which is not limited in the embodiment.

[0035] The structure of the radial dynamic pressure air bearing is simplified and easier to manufacture by directly combining the bushing 4 with the rotor spindle 6.

[0036] Since the herringbone groove is conducive to the formation of dynamic pressure film, in this embodiment, the first dynamic pressure groove 61 is preferably a herringbone groove, and each first dynamic pressure groove 61 is evenly distributed along the circumference of the rotor main shaft 6.

[0037] Thus, as Figure 3 As shown by the arrow, when the rotor shaft 6 rotates, the viscosity of the fluid drives the air to rotate with the rotor shaft 6. At the same time, the air gathers from both ends of the first dynamic pressure groove 61 towards the middle, forming a dynamic pressure film to support the rotor shaft 6 and prevent the rotor shaft 6 from moving radially. The higher the rotational speed of the rotor shaft 6, the greater the dynamic pressure bearing capacity of the dynamic pressure film, and the more stable the operation of the rotor shaft 6.

[0038] To prevent excessive pressure in the first dynamic pressure groove 61, this embodiment provides a pressure relief hole (not shown in the figure) on the bushing 4.

[0039] In this embodiment, a second bearing seat 8 is provided inside the cylinder 2, located between the first bearing seat 3 and the volute 9. A thrust plate 7 is provided on the rotor main shaft 6, located between the first bearing seat 3 and the second bearing seat 8. Multiple second dynamic pressure grooves 71 for air inflow are provided on the side of the thrust plate 7 closest to the first bearing seat 3 and the second bearing seat 8. The end face of the first bearing seat 3, the end face of the thrust plate 7, and the end face of the second bearing seat 8 together constitute a thrust dynamic pressure air bearing. This structural form, combining the thrust plate 7 with the end face of the first bearing seat 3 and the end face of the second bearing seat 8, simplifies the structure of the entire thrust dynamic pressure air bearing and makes it easier to manufacture.

[0040] In this embodiment, a pressure block 17 for pressing the push plate is provided on the rotor main shaft 6. The pressure block 17 is located between the push plate 7 and the impeller 10, and the pressure block 17 is located in the inner cavity of the second bearing seat 8. The pressure block 17 is pressed by the impeller 10, and then the push plate 7 is pressed by the pressure block 17, so that the push plate 7 is fixed on the rotor main shaft 6. In practical applications, the push plate 7 can also be fixed by screw locking. This embodiment does not limit this.

[0041] In this embodiment, the second dynamic pressure groove 71 is preferably an arc-shaped groove, and the second dynamic pressure groove 71 on each side is distributed in a vortex shape with the axis of the push plate 7 as the central axis. This structure is beneficial to the formation of dynamic pressure film.

[0042] Thus, as Figure 4As indicated by the arrow, when the rotor shaft 6 rotates, the viscosity of the fluid drives the air to rotate with the bearing plate 7. At the same time, the air gathers from the outside to the inside along the second dynamic pressure groove 71 to form a dynamic pressure film to support the rotor shaft 6 and prevent the rotor shaft 6 from moving axially. The higher the rotational speed of the rotor shaft 6, the greater the dynamic pressure bearing capacity of the dynamic pressure film, and the more stable the operation of the rotor shaft 6.

[0043] To ensure timely heat dissipation of the air-suspended high-speed centrifugal compressor, a water-cooling structure is provided in this embodiment.

[0044] The water-cooling structure includes:

[0045] Multiple end cap water channels 11 are provided on the end cap 1. One of the end cap water channels 11 is provided with an inlet 12 and an outlet 13. An inlet pipe 15 is connected to the inlet 12 and an outlet pipe 16 is connected to the outlet 13.

[0046] Multiple waterway groups are provided on the cylinder 2, each waterway group including an inlet waterway 21 and an outlet waterway 22 parallel to the axis of the cylinder 2;

[0047] And multiple bearing housing water channels 31 provided on the first bearing housing 3;

[0048] The number of end cap water channel 11, water channel group and bearing seat water channel 31 are equal. The end cap water channel 11 corresponds one-to-one with the water channel group. Each end cap water channel 11 is connected to the inlet water channel 21 and the return water channel 22 of the same water channel group. The inlet water channel 21 and the return water channel 22 of the same water channel group are connected to the two adjacent bearing seat water channel 31.

[0049] To enhance sealing, sealing rings (not shown in the figure) are provided between the cylinder 2 and the end cap 1, and between the cylinder 2 and the first bearing seat 3, respectively.

[0050] During operation, water enters through the inlet 12 of the end cover 1 and flows out through the outlet 13 of the end cover 1. The entire water flow is in an "S" shape inside the equipment, which greatly improves the cooling efficiency, prevents damage to the components inside the equipment due to high temperature, and extends the service life of the components.

[0051] To further ensure timely heat dissipation of the air-suspended high-speed centrifugal compressor, this embodiment also incorporates an air-cooling structure within the air-suspended high-speed centrifugal compressor.

[0052] The air-cooled structure includes a bearing housing air passage 32 disposed on the first bearing housing 3, a bushing air passage 41 disposed on the bushing 4, and an exhaust port 14 disposed on the end cover 1. The air inlet 91, bearing housing air passage 32, bushing air passage 41 and exhaust port 14 of the volute 9 are connected.

[0053] By setting up an air-cooling structure, the various components inside the equipment can be effectively cooled, further preventing damage to the components due to high temperatures and extending the service life of each component.

[0054] In this embodiment, a self-circulating casing processing structure is provided inside the volute 9. The self-circulating casing processing structure includes a guide portion 92 protruding from the inner wall of the volute 9 and an air inlet cylinder 94 provided on the inner wall of the volute 9 via a connecting rib 93. The guide portion 92, the air inlet cylinder 94 and the volute 9 together form an air inlet groove 95, and a self-circulating air passage 96 is formed between the guide portion 92 and the air inlet cylinder 94, which connects the air inlet groove 95 and the inner cavity of the air inlet cylinder 94.

[0055] By setting up a self-circulating casing processing structure, air forms a circulating airflow between the air inlet end of the air inlet cylinder 94, the inner cavity of the air inlet cylinder 94, the self-circulating air passage 96, and the air inlet slot 95, which reduces the loss of airflow drawn into the air inlet cylinder 94, widens the flow range of the equipment, and improves the working efficiency of the equipment.

[0056] To facilitate the flow of gas into the air inlet cylinder 94, a conical guide shroud 97 is provided at the air inlet 91 of the volute 9 in this embodiment.

[0057] During operation, the impeller 10 is driven to rotate at high speed directly by the rotor main shaft 6. Gas is drawn in through the air inlet 91 of the volute 9, converting kinetic energy into pressure energy. After further increasing the pressure, the gas is thrown out from the air outlet 98, outputting clean and oil-free continuous gas.

[0058] During this process, a small amount of gas flows in through the gap between the impeller 10 and the second bearing housing 8. Part of this gas enters the thrust dynamic pressure air bearing and the radial dynamic pressure air bearing, forming a supporting and lubricating dynamic pressure film, thus suspending the rotor shaft 6 and enabling free rotation. The other part of the gas enters the inner cavity of the cylinder 2 through the bearing housing air passage 32 on the first bearing housing 3 and the shaft sleeve air passage 41 on the shaft sleeve 4, effectively dissipating heat from the components inside the cylinder 2. Figure 1 The arrow indicates the direction; at the same time, the water-cooling structure cools the entire machine body.

[0059] The air-suspended high-speed centrifugal compressor of this invention shortens the shaft system by adopting a cantilever structure, which makes the structure of the equipment simpler and more compact, improves the stability and impact resistance of the equipment, and reduces the weight. By using radial dynamic pressure air bearings and thrust dynamic pressure air bearings, and using air as the lubricant and coolant for the rotor shaft rotation, the noise of the equipment is reduced, the reliability of the equipment operation is improved, and the service life of the equipment is extended.

[0060] This invention is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort are within the scope of protection of this invention.

Claims

1. An air-suspension high-speed centrifugal compressor, comprising a casing, a stator, a rotor shaft, a volute and an impeller, the stator being arranged in the casing, the volute being arranged at one end of the casing, and the impeller being arranged in the volute, characterized in that, a radial dynamic pressure air bearing and a thrust dynamic pressure air bearing are arranged in the casing, the rotor shaft is rotatably arranged in the casing through the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing, one end of the rotor shaft is fixedly connected with the impeller, and the other end of the rotor shaft is cantilevered in the inner cavity of the stator; a first bearing seat is arranged in the casing, a shaft sleeve is arranged on the first bearing seat, the rotor shaft is rotatably arranged in the shaft sleeve, a plurality of first dynamic pressure grooves for air inflow are circumferentially arranged on the rotor shaft at positions corresponding to the shaft sleeve, and the shaft sleeve and the rotor shaft jointly constitute the radial dynamic pressure air bearing; the first dynamic pressure grooves are herringbone grooves, and each of the first dynamic pressure grooves is uniformly distributed along the circumference of the rotor shaft; a second bearing seat is arranged in the casing, the second bearing seat is located between the first bearing seat and the volute; a thrust piece is arranged on the rotor shaft, the thrust piece is located between the first bearing seat and the second bearing seat, and a plurality of second dynamic pressure grooves for air inflow are arranged on the sides of the thrust piece close to the first bearing seat and the second bearing seat, respectively, and the end face of the first bearing seat, the thrust piece and the end face of the second bearing seat jointly constitute the thrust dynamic pressure air bearing; a self-circulation machine case processing structure is arranged in the volute, the self-circulation machine case processing structure comprises a flow guide part protruding from the inner wall of the volute and an air inlet cylinder arranged on the inner wall of the volute through a connecting rib, the flow guide part, the air inlet cylinder and the volute jointly enclose an air inlet groove, and the flow guide part and the air inlet cylinder form a self-circulation air channel that communicates the air inlet groove with the inner cavity of the air inlet cylinder. The second dynamic pressure grooves are circular arc grooves, and each of the second dynamic pressure grooves is distributed in a spiral shape with the axis of the thrust piece as the central axis. The casing comprises a cylinder body with two open ends and an end cover arranged at one end of the cylinder body, the stator is arranged in the cylinder body and located between the end cover and the first bearing seat. The air-suspension high-speed centrifugal compressor is provided with a water cooling structure, the water cooling structure comprises: a plurality of end cover water channel grooves arranged on the end cover, one of the end cover water channel grooves is provided with a water inlet and a water outlet; 2. The air-suspension high-speed centrifugal compressor according to claim 1, characterized in that, a plurality of water channel groups arranged on the cylinder body, each water channel group comprises a water inlet channel and a water return channel which are parallel to the axial direction of the cylinder body; 3. The air suspension high-speed centrifugal compressor according to any one of claims 1 to 2, characterized in that, and a plurality of bearing seat water channel grooves arranged on the first bearing seat; 4. The air-suspension high-speed centrifugal compressor according to claim 3, characterized in that, the number of the end cover water channel grooves, the water channel groups and the bearing seat water channel grooves is equal, the end cover water channel grooves correspond to the water channel groups one by one, each of the end cover water channel grooves is in communication with the water inlet channel and the water return channel of the same water channel group, respectively, and the water inlet channel and the water return channel of the same water channel group are in communication with two adjacent bearing seat water channel grooves, respectively. ​ ​ ​ ​ 5. The air-suspension high-speed centrifugal compressor according to claim 3, characterized in that, The air suspension high-speed centrifugal compressor is provided with a wind cooling structure, which comprises a bearing seat air channel arranged on the first bearing seat, a shaft sleeve air channel arranged on the shaft sleeve, and an exhaust port arranged on the end cover, and the air inlet of the volute, the bearing seat air channel, the shaft sleeve air channel and the exhaust port are communicated.

6. The air-suspension high-speed centrifugal compressor according to claim 5, characterized in that, A conical fairing is arranged at the air inlet.

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