Supercharged suction cooling type air floating centrifugal air compressor and working method

Abstract

The application discloses a kind of pressurized suction cooling type air float centrifugal air compressor and working method, the system includes air inlet pipeline, centrifugal impeller, exhaust volute, permanent magnet synchronous motor main shaft and shell, air float thrust disc, air float radial bearing, pressurized impeller and its air inlet pipeline, stator core and winding, fixed structure, motor cold air outlet ring cavity, suction pipeline and suction ring cavity, the main stream area and cold gas flow area structure of air float centrifugal air compressor are proposed in the application, for the problem that high-speed synchronous motor generates large amount of heat, small heat dissipation space, easy to burn out, on the basis of the main stream area and cold gas flow area structure of air float centrifugal air compressor, the technical scheme for solving pressurized cold gas and outlet suction air combination is proposed, the cold gas flow rate and flow can be maximized to ensure that the heat generated by high-speed synchronous motor design operating condition long time operation is taken out in time, to ensure the operation safety of entire unit.

Description

Technical Field

[0001] This invention relates to the field of gas compression and dust conveying technology, specifically to a pressurized suction-cooled air-float centrifugal air compressor and its working method. Background Technology

[0002] Each year, the electricity consumption of equipment such as blowers, air compressors, compressors, and pumps accounts for about one-third of the annual power generation. Improving the energy efficiency of these devices will directly reduce enterprises' electricity expenditures and carbon emission targets. Air compressors designed using high-speed synchronous permanent magnet direct drive motor technology, dynamic pressure air bearing technology, and aerospace centrifugal impeller technology have advantages such as small design flow rate, high efficiency, high energy density, and low cost. However, they also suffer from problems such as high motor heat generation and limited heat dissipation space. Therefore, the motor equipment of air-floating centrifugal air compressors using this technology is prone to damage, preventing the full realization of the technological advantages of air-floating centrifugal air compressors. Currently, there is no effective technical solution to these problems. Summary of the Invention

[0003] The purpose of this invention is to provide a pressurized suction cooling type air flotation centrifugal air compressor and its working method in order to solve the above-mentioned problems.

[0004] The present invention achieves the above objectives through the following technical solutions:

[0005] The aforementioned pressurized suction-cooled air-float centrifugal air compressor includes an inlet pipe 1, a centrifugal impeller 2, an exhaust volute 3, a permanent magnet synchronous motor main shaft 4, an air-float thrust disc 5, a first air-float radial bearing 6, a second air-float radial bearing 7, a pressurized impeller 8, a pressurized impeller inlet pipe 9, a stator core 10, a stator winding 11, a fixing structure 12, a permanent magnet synchronous motor housing 13, a motor cooling air outlet annular cavity 14, a suction pipe 15, and a suction annular cavity 16. The centrifugal impeller 2, the air-float thrust disc 5, and the pressurized impeller 8 are sequentially fixed on the permanent magnet synchronous motor main shaft 4. Between the air-float thrust disc 5 and the pressurized impeller 8, the radial bearing support of the permanent magnet synchronous motor main shaft 4 is supported by the first air-float radial bearing 6 and the second air-float radial bearing 7, respectively. One end of the inlet pipe 1 passes through an external pipe of the centrifugal impeller 2. Connected to the exhaust volute 3, the motor cold air outlet annular cavity 14 is located on the permanent magnet synchronous motor housing 13. One end of the suction pipe 15 is connected to the inlet of the suction annular cavity 16, and the other end is connected to the motor cold air outlet annular cavity 14. The outlet of the suction annular cavity 16 is connected to the side of the intake pipe 1. One end of the booster impeller intake pipe 9 is connected to the permanent magnet synchronous motor housing 13, and the other end is connected to the external pipe of the booster impeller 8. The stator winding 11 is fixed on the stator core 10. The stator core 10 is fixed on the permanent magnet synchronous motor housing 13 through the fixing structure 12. The center line of the main shaft 4 of the permanent magnet synchronous motor coincides with the center line of the stator core 10 and the stator winding 11. The inlet of the motor cold air outlet annular cavity 14 and the outlet of the external pipe of the booster impeller 8 are directly connected to the internal cavity of the permanent magnet synchronous motor housing 13.

[0006] The cross-sectional area of ​​the suction pipe 15 and the suction ring cavity 16 gradually increases from the inlet to the outlet. The outlet area of ​​the suction pipe 15 is 3 to 5 times the inlet area, and the outlet area of ​​the suction ring cavity 16 is 2 to 3 times the inlet area. The inner surface of the suction ring cavity 16 smoothly and gradually transitions to the outlet surface of the suction pipe 15 and the side of the air inlet pipe 1.

[0007] The first air-bearing radial bearing 6 and the second air-bearing radial bearing 7 are dynamic pressure air suspension bearings with a working speed range of 16,000 to 120,000 revolutions per minute.

[0008] The permanent magnet synchronous motor spindle 4 consists of a spindle support section, a permanent magnet, and a high-temperature alloy sheath, with the high-temperature alloy sheath located on the outside of the permanent magnet.

[0009] The working method of the pressurized suction-cooled air-float centrifugal air compressor includes the working process of the main working fluid and the working process of the cooling gas of the permanent magnet synchronous motor. The working process of the main working fluid refers to the main working fluid entering the centrifugal impeller 2 through the inlet pipe 1, being pressurized by the centrifugal impeller 2, and then being discharged from the outlet of the exhaust volute 3. The working process of the cooling gas of the permanent magnet synchronous motor refers to the cooling gas of the permanent magnet synchronous motor entering the pressurized impeller 8 through the pressurized impeller inlet pipe 9, being pressurized by the pressurized impeller 8, entering the internal cavity of the permanent magnet synchronous motor housing 13, passing through the gap between the permanent magnet synchronous motor main shaft 4, stator core 10, stator winding 11 and the permanent magnet synchronous motor housing 13, carrying away the heat generated during the operation of the permanent magnet synchronous motor, and flowing through the motor cooling gas outlet annular cavity 14, suction pipe 15 and suction annular cavity 16 into the inlet pipe 1 to merge with the main working fluid.

[0010] The beneficial effects of this invention are as follows:

[0011] Currently, there is no effective solution for high-speed dynamic pressure air-float synchronous permanent magnet direct-drive centrifugal air compressors with high motor heat generation and high pressure ratio. This invention proposes a low-cost, highly operable booster-suction cooling air-float centrifugal air compressor structure and operating method. Addressing the issues of high heat generation, limited heat dissipation space, and susceptibility to burnout of the high-speed synchronous motor, this invention combines booster cooling air delivery with outlet suction air delivery, based on the main flow and cold air flow area structure of the air-float centrifugal air compressor. This maximizes the cold air flow rate and velocity, ensuring that the heat generated during long-term operation of the high-speed synchronous motor is promptly dissipated, thereby ensuring the safe operation of the entire unit. Furthermore, the gradual increase in cross-sectional area of ​​the suction ring cavity from the inlet to the outlet, and the smooth, gradual transition between the inner surface of the suction ring cavity and the outlet surface of the suction pipeline and the side of the inlet pipeline, all minimize separation flow losses and enhance the suction effect on cold air. This invention uses a dynamic pressure air suspension bearing, which minimizes frictional losses during equipment operation without requiring an external air supply device. The permanent magnet synchronous motor spindle of this invention is fixed and protected by a high-temperature alloy sheath, improving the safety of the equipment. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the pressurized suction cooling air flotation centrifugal air compressor of the present invention. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings:

[0014] like Figure 1As shown, the booster suction cooling type air-float centrifugal air compressor includes an inlet pipe 1, a centrifugal impeller 2, an exhaust volute 3, a permanent magnet synchronous motor main shaft 4, an air-float thrust disc 5, a first air-float radial bearing 6, a second air-float radial bearing 7, a booster impeller 8, a booster impeller inlet pipe 9, a stator core 10, a stator winding 11, a fixed structure 12, a permanent magnet synchronous motor housing 13, a motor cooling air outlet annular cavity 14, a suction pipe 15, and a suction annular cavity 16. The centrifugal impeller 2, the air-float thrust disc 5, and the booster impeller 8 are sequentially fixed on the permanent magnet synchronous motor main shaft 4. Between the air-float thrust disc 5 and the booster impeller 8, the radial bearing support of the permanent magnet synchronous motor main shaft 4 is supported by the first air-float radial bearing 6 and the second air-float radial bearing 7, respectively. One end of the inlet pipe 1 passes through an external pipe of the centrifugal impeller 2. Connected to the exhaust volute 3, the motor cold air outlet annular cavity 14 is located on the permanent magnet synchronous motor housing 13. One end of the suction pipe 15 is connected to the inlet of the suction annular cavity 16, and the other end is connected to the motor cold air outlet annular cavity 14. The outlet of the suction annular cavity 16 is connected to the side of the intake pipe 1. One end of the booster impeller intake pipe 9 is connected to the permanent magnet synchronous motor housing 13, and the other end is connected to the external pipe of the booster impeller 8. The stator winding 11 is fixed on the stator core 10. The stator core 10 is fixed on the permanent magnet synchronous motor housing 13 through the fixing structure 12. The center line of the main shaft 4 of the permanent magnet synchronous motor coincides with the center line of the stator core 10 and the stator winding 11. The inlet of the motor cold air outlet annular cavity 14 and the outlet of the external pipe of the booster impeller 8 are directly connected to the internal cavity of the permanent magnet synchronous motor housing 13.

[0015] In a preferred embodiment of the present invention, the cross-sectional area of ​​the suction pipe 15 and the suction ring cavity 16 gradually increases from the inlet to the outlet. The outlet area of ​​the suction pipe 15 is 3 to 5 times the inlet area, and the outlet area of ​​the suction ring cavity 16 is 2 to 3 times the inlet area. The inner surface of the suction ring cavity 16 smoothly and gradually transitions to the outlet surface of the suction pipe 15 and the side of the air inlet pipe 1.

[0016] In a preferred embodiment of the present invention, the first air-bearing radial bearing 6 and the second air-bearing radial bearing 7 are dynamic pressure air suspension bearings with a working speed range of 16,000 to 120,000 revolutions per minute.

[0017] In a preferred embodiment of the present invention, the permanent magnet synchronous motor spindle 4 is composed of a spindle support section, a permanent magnet and a high-temperature alloy sheath, with the high-temperature alloy sheath located on the outside of the permanent magnet.

[0018] The working method of the pressurized suction-cooled air-floating centrifugal air compressor of the present invention includes the working process of the main working fluid and the working process of the cooling gas of the permanent magnet synchronous motor. The working process of the main working fluid refers to the main working fluid entering the centrifugal impeller 2 through the intake pipe 1, being pressurized by the centrifugal impeller 2, and then being discharged from the outlet of the exhaust volute 3. The working process of the cooling gas of the permanent magnet synchronous motor refers to the cooling gas of the permanent magnet synchronous motor entering the pressurized impeller 8 through the pressurized impeller intake pipe 9, being pressurized by the pressurized impeller 8, entering the internal cavity of the permanent magnet synchronous motor housing 13, passing through the gap between the permanent magnet synchronous motor main shaft 4, stator core 10, stator winding 11 and the permanent magnet synchronous motor housing 13, carrying away the heat generated during the operation of the permanent magnet synchronous motor, and flowing through the motor cooling gas outlet annular cavity 14, suction pipe 15 and suction annular cavity 16 into the intake pipe 1 to merge with the main working fluid.

[0019] The technical solutions of the present invention are not limited to the specific embodiments described above. Any technical modifications made in accordance with the technical solutions of the present invention fall within the protection scope of the present invention.

Claims

1. A booster-suction-cooled air-float centrifugal air compressor, characterized in that: The components include an intake pipe (1), a centrifugal impeller (2), an exhaust volute (3), a permanent magnet synchronous motor main shaft (4), an air-bearing thrust plate (5), a first air-bearing radial bearing (6), a second air-bearing radial bearing (7), a booster impeller (8), a booster impeller intake pipe (9), a stator core (10), a stator winding (11), a fixed structure (12), a permanent magnet synchronous motor housing (13), a motor cooling air outlet annular cavity (14), a suction pipe (15), and a suction annular cavity (16). Among these, the centrifugal impeller (2), the air-bearing thrust plate (5), and the booster impeller (8) are... The components are fixed sequentially on the main shaft (4) of the permanent magnet synchronous motor, between the air-bearing thrust disc (5) and the booster impeller (8). The radial bearing support of the main shaft (4) of the permanent magnet synchronous motor is supported by the first air-bearing radial bearing (6) and the second air-bearing radial bearing (7). One end of the intake pipe (1) is connected to the exhaust volute (3) through the external pipe of the centrifugal impeller (2). The motor cold air outlet annular cavity (14) is located on the outer shell (13) of the permanent magnet synchronous motor. One end of the suction pipe (15) is connected to the inlet of the suction annular cavity (16), and the other end is connected to the motor cold air outlet annular cavity (14). The suction annular cavity (16) outlet is connected to the side of the intake pipe (1), one end of the booster impeller intake pipe (9) is connected to the permanent magnet synchronous motor housing (13), and the other end is connected to the external pipe of the booster impeller (8). The stator winding (11) is fixed on the stator core (10), and the stator core (10) is fixed on the permanent magnet synchronous motor housing (13) by the fixing structure (12). The center line of the main shaft (4) of the permanent magnet synchronous motor coincides with the center line of the stator core (10) and the stator winding (11). The inlet of the motor cold air outlet annular cavity (14) is connected to the side of the intake pipe (14). The external pipe outlet of the booster impeller (8) is directly connected to the internal chamber of the permanent magnet synchronous motor housing (13). The cross-sectional area of ​​the suction pipe (15) and the suction ring cavity (16) gradually increases from the inlet to the outlet. The outlet area of ​​the suction pipe (15) is 3 to 5 times the inlet area of ​​the suction pipe (15), and the outlet area of ​​the suction ring cavity (16) is 2 to 3 times the inlet area of ​​the suction ring cavity (16). The inner surface of the suction ring cavity (16) smoothly transitions to the outlet surface of the suction pipe (15) and the side of the air inlet pipe (1), respectively.

2. The pressurized suction-cooled air-float centrifugal air compressor according to claim 1, characterized in that: The first air-bearing radial bearing (6) and the second air-bearing radial bearing (7) are dynamic pressure air suspension bearings with a working speed range of 16,000 to 120,000 revolutions per minute.

3. The pressurized suction-cooled air-float centrifugal air compressor according to claim 1, characterized in that: The permanent magnet synchronous motor spindle (4) consists of a spindle support section, a permanent magnet and a high-temperature alloy sheath, with the high-temperature alloy sheath located on the outside of the permanent magnet.

4. A method for operating a pressurized suction-cooled air-floating centrifugal air compressor according to any one of claims 1 to 3, characterized in that: The working method includes the working process of the mainstream working fluid and the working process of the cooling gas of the permanent magnet synchronous motor. The working process of the mainstream working fluid refers to the mainstream working fluid entering the centrifugal impeller (2) through the intake pipe (1), and after the pressure is increased by the centrifugal impeller (2), it is discharged from the outlet of the exhaust volute (3). The working process of the cooling gas of the permanent magnet synchronous motor refers to the cooling gas of the permanent magnet synchronous motor entering the booster impeller (8) through the booster impeller intake pipe (9), and after the pressure is increased by the booster impeller (8), it enters the internal cavity of the permanent magnet synchronous motor housing (13), and carries away the heat generated during the operation of the permanent magnet synchronous motor through the gap between the permanent magnet synchronous motor main shaft (4), stator core (10), stator winding (11) and permanent magnet synchronous motor housing (13). It flows through the motor cooling gas outlet ring cavity (14), suction pipe (15) and suction ring cavity (16) and enters the intake pipe (1) to merge with the mainstream gas.

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