Gas compression assembly for a centrifugal compressor and centrifugal compressor

Abstract

The application discloses a gas compression assembly for a centrifugal compressor and the centrifugal compressor, and relates to the technical field of compressors.The gas compression assembly comprises a motor, a first-stage compression wheel, a second-stage compression wheel and a third-stage compression wheel.The motor is provided with a rotor shaft, the rotor shaft is formed with a weight-reducing space, the first-stage compression wheel is fixedly arranged at a first end of the rotor shaft, a first-stage compression wheel nose is located at a side of a first-stage compression wheel back away from the motor, the second-stage compression wheel is fixedly arranged at a second end of the rotor shaft, a second-stage compression wheel back is located at a side of a second-stage compression wheel nose away from the motor, the third-stage compression wheel is fixedly arranged at the second end of the rotor shaft and located at a side of the second-stage compression wheel back away from the motor, and a third-stage compression wheel nose is located at a side of a third-stage compression wheel back away from the motor.The gas compression assembly according to the embodiment of the application can realize the staged compression of gas, the centrifugal compressor can realize a higher pressure ratio, the gas loss can be reduced, the working efficiency of the gas compression assembly is improved, and the weight of the gas compression assembly is reduced.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a gas compression assembly for a centrifugal compressor and a centrifugal compressor having the gas compression assembly. Background Technology

[0002] In related technologies, existing centrifugal compressors cannot achieve higher pressure ratios, have low efficiency, and the gas compression components of centrifugal compressors are heavy. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a gas compression assembly for a centrifugal compressor, which can achieve staged compression of gas, enabling the centrifugal compressor to achieve a higher pressure ratio, improving the working efficiency of the gas compression assembly, and also reducing the weight of the gas compression assembly.

[0004] The present invention further proposes a centrifugal compressor using the above-described gas compression assembly.

[0005] According to a first aspect of the present invention, a gas compression assembly for a centrifugal compressor includes: a motor, a primary pressure roller, a secondary pressure roller, and a tertiary pressure roller. The motor has a rotor shaft with a weight-reduction space. The primary pressure roller is fixed to a first end of the rotor shaft and has a primary pressure roller nose and a primary pressure roller back. The primary pressure roller nose is located on the side of the primary pressure roller back away from the motor. The secondary pressure roller is fixed to a second end of the rotor shaft and has a secondary pressure roller nose and a secondary pressure roller back. The secondary pressure roller back is located on the side of the secondary pressure roller nose away from the motor. The secondary pressure roller is used to compress the gas compressed by the primary pressure roller. The tertiary pressure roller is fixed to the second end of the rotor shaft and located on the side of the secondary pressure roller away from the motor. The tertiary pressure roller has a tertiary pressure roller nose and a tertiary pressure roller back. The tertiary pressure roller nose is located on the side of the tertiary pressure roller back away from the motor. The tertiary pressure roller is used to compress the gas compressed by the secondary pressure roller.

[0006] According to the gas compression assembly of the present application embodiment, staged compression of gas can be achieved, enabling the centrifugal compressor to achieve a higher pressure ratio, reducing gas loss, improving the stability of the gas compression assembly during operation, increasing the working efficiency of the gas compression assembly, and reducing the weight of the gas compression assembly.

[0007] According to some embodiments of the present invention, the motor further includes a housing and a stator. The housing defines a mounting cavity. The stator is disposed within the mounting cavity and fixed to the housing sidewall of the housing. The rotor shaft is rotatably disposed within the housing and passes through the housing. The housing sidewall forms a wire outlet hole communicating with the mounting cavity. The wire outlet hole is located at the end of the housing sidewall away from the first-stage pressure roller. The electrical connection wire of the stator is installed in the wire outlet hole.

[0008] According to some embodiments of the present invention, the motor further includes a housing having a mounting base opposite to the secondary pressure roller, the rotor shaft passing through the mounting base and rotatable relative to the mounting base, and a flow guiding structure formed on the surface of the mounting base facing the secondary pressure roller, the flow guiding structure being configured to guide gas compressed by the primary pressure roller to the secondary pressure roller.

[0009] According to some embodiments of the present invention, the flow guiding structure includes a plurality of flow guiding blades, which are arranged around the rotor shaft along the circumference of the mounting base.

[0010] According to some embodiments of the present invention, the motor further includes a housing, wherein a cooling channel is formed in the side wall of the housing, and a heat dissipation structure is formed on the inner surface of the cooling channel.

[0011] According to some embodiments of the present invention, the shell sidewall includes an inner sidewall and an outer sidewall, the outer sidewall being sleeved outside the inner sidewall and detachably connected to the inner sidewall, a first groove being formed on the surface of the outer sidewall facing the inner sidewall, and a second groove being formed on the surface of the inner sidewall facing the outer sidewall, the first groove and the second groove being opposite to each other to define the cooling flow channel.

[0012] According to some embodiments of the present invention, the gas compression assembly for the centrifugal compressor further includes: a shaft seal; the motor further includes a housing; the housing has a mounting seat opposite to the secondary pressure roller; the mounting seat has a mounting through hole; the rotor shaft passes through the mounting through hole and is rotatable relative to the mounting seat; the shaft seal is sleeved on the rotor shaft and installed in the mounting through hole; one of a sealing boss and a sealing groove is formed on the outer side wall of the shaft seal; the other of the sealing boss and the sealing groove is formed on the surface of the mounting through hole facing the outer side wall of the shaft seal; the sealing boss is assembled to the sealing groove and has a clearance fit with the inner wall of the sealing groove; there are multiple sealing bosses and sealing grooves; and the sealing bosses and sealing grooves are arranged in a stepped manner along the axial direction of the rotor shaft.

[0013] According to some embodiments of the present invention, the end face of the shaft seal facing away from the first-stage pressure roller is configured as a first abutting surface, and the inner surface of the mounting through hole is formed with a second abutting surface. The first abutting surface and the second abutting surface are opposite to each other along the axial direction of the rotor shaft, and the first abutting surface and the second abutting surface abut against each other.

[0014] According to some embodiments of the present invention, the gas compression assembly for the centrifugal compressor further includes: a partition plate, the partition plate being sleeved on the rotor shaft and located between the secondary pressure roller and the tertiary pressure roller, so as to space the secondary pressure roller and the tertiary pressure roller apart.

[0015] A centrifugal compressor according to a second aspect of the present invention includes the gas compression assembly described in the above embodiments.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a cross-sectional view of a gas compression assembly according to an embodiment of this application;

[0019] Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle;

[0020] Figure 3 yes Figure 1 A magnified view of a portion of region B in the middle.

[0021] Figure label:

[0022] Gas compression assembly 1,

[0023] Motor 10, rotor shaft 11, weight reduction space 111, outer casing 12, mounting cavity 121, casing sidewall 122, cable outlet hole 1221, cooling channel 1222, inner sidewall 1223, outer sidewall 1224, mounting base 123, flow guiding structure 1231, mounting through hole 1232, sealing groove 1233, second abutment surface 1234, stator 13, electrical connection wire 131, first air radial bearing 14, second air radial bearing 15.

[0024] First-stage pressure roller 20, first-stage pressure roller nose 21, first-stage pressure roller back 22, first mounting hole 23, first mounting hole 24.

[0025] Secondary pressure roller 30, secondary pressure roller nose 31, secondary pressure roller back 32, first mounting groove 321, second mounting hole 33.

[0026] Third-stage pressure roller 40, third-stage pressure roller nose 41, third-stage pressure roller back 42, second mounting groove 421, third mounting hole 43, second mounting hole 44.

[0027] Shaft seal 50, sealing boss 51, first abutment surface 52

[0028] Gas flow channel 60,

[0029] Air thrust bearing 70, thrust disc 71,

[0030] Back plate 80, third through hole 81,

[0031] End wall 90, second through hole 91. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] The following is for reference. Figures 1-3 A gas compression assembly 1 for a centrifugal compressor is described according to an embodiment of the present invention. The gas compression assembly 1 can be installed on the centrifugal compressor.

[0034] According to an embodiment of the first aspect of the present invention, a gas compression assembly 1 for a centrifugal compressor, such as Figure 1 and Figure 2 As shown, the gas compression assembly 1 may include: a motor 10, a primary pressure roller 20, a secondary pressure roller 30, and a tertiary pressure roller 40. The motor 10 has a rotor shaft 11, which forms a weight reduction space 111. The primary pressure roller 20 is fixed to the first end of the rotor shaft 11 and has a primary pressure roller nose 21 and a primary pressure roller back 22. The primary pressure roller nose 21 is located on the side of the primary pressure roller back 22 away from the motor 10. The secondary pressure roller 30 is fixed to the second end of the rotor shaft 11 and has a secondary pressure roller nose 30. The first and second stage pressure rollers 30 are located on the side of the second stage pressure roller nose 31 away from the motor 10. The second stage pressure roller 30 is used to compress the gas compressed by the first stage pressure roller 20. The third stage pressure roller 40 is fixed to the second end of the rotor shaft 11 and is located on the side of the second stage pressure roller 30 away from the motor 10. The third stage pressure roller 40 has a third stage pressure roller nose 41 and a third stage pressure roller back 42. The third stage pressure roller nose 41 is located on the side of the third stage pressure roller back 42 away from the motor 10. The third stage pressure roller 40 is used to compress the gas compressed by the second stage pressure roller 30.

[0035] It should be noted that, in the relevant technologies, existing centrifugal compressors cannot achieve higher pressure ratios, have low efficiency, and the gas compression components of centrifugal compressors are heavy.

[0036] Based on this, this application provides a gas compression assembly 1 for a centrifugal compressor. The motor 10 has a rotor shaft 11, which can extend along a first direction. When the gas compression assembly 1 is in the following position... Figure 1 When setting the direction, the first direction can be... Figure 1 The X-axis in the first direction can be parallel to the axial direction of the rotor shaft 11. The rotor shaft 11 can be made of magnetic steel material, and the rotor shaft 11 can form a weight reduction space 111. By setting the rotor shaft 11 as a hollow shaft, the weight of the rotor shaft 11 can be reduced, which is beneficial to reducing costs. The modal frequency of the rotor shaft 11 can be increased, reducing the risk of vibration when the rotor shaft 11 rotates, which is beneficial to reducing the weight of the gas compression assembly 1.

[0037] The rotor shaft 11 can be connected to the primary pressure roller 20, the secondary pressure roller 30, and the tertiary pressure roller 40, and the rotor shaft 11 can drive the primary pressure roller 20, the secondary pressure roller 30, and the tertiary pressure roller 40 to rotate together. When the primary pressure roller 20 rotates, it can compress the gas located within it. When the secondary pressure roller 30 rotates, it can compress the gas located within it. When the tertiary pressure roller 40 rotates, it can compress the gas located within it. The primary pressure roller 20, the secondary pressure roller 30, and the tertiary pressure roller 40 can all be impellers. As an example, the primary pressure roller 20 and the secondary pressure roller 30 can be closed impellers, and the tertiary pressure roller 40 can be an open impeller. The primary pressure roller 20 can be fixed to the first end of the rotor shaft 11. The primary pressure roller 20 can be fixedly connected to the rotor shaft 11 by means of snap-fit, bolt connection, etc. The primary pressure roller 20 has a primary pressure roller nose 21 and a primary pressure roller back 22. When the primary pressure roller 20 is assembled with the rotor shaft 11, the primary pressure roller nose 21 and the primary pressure roller back 22 can be arranged opposite to each other and spaced apart along the first direction. The primary pressure roller back 22 is located on the side of the primary pressure roller 20 facing the motor 10, and the primary pressure roller nose 21 is located on the side of the primary pressure roller back 22 away from the motor 10.

[0038] As an example, the primary pressure roller 20 can be fixedly connected to the rotor shaft 11 by bolts. The primary pressure roller 20 can have a first mounting hole 23, which is located on the side of the primary pressure roller 20 facing the motor 10. The rotor shaft 11 can extend into the first mounting hole 23 and abut against the inner wall of the first mounting hole 23, so that the primary pressure roller 20 can be sleeved on the rotor shaft 11. The primary pressure roller 20 can also have a first mounting hole 24, which can penetrate the primary pressure roller 20 along a first direction. The first mounting hole 24 and the first mounting hole 23 are arranged opposite to each other and are connected along the first direction. When the primary pressure roller 20 is sleeved on the rotor shaft 11, the fixing bolts can pass through the first mounting hole 24 and the first mounting hole 23 and cooperate with the rotor shaft 11 to fix the primary pressure roller 20 and the rotor shaft 11. The rotor shaft 11 can drive the primary pressure roller 20 to rotate together.

[0039] The secondary pressure roller 30 can be fixed to the second end of the rotor shaft 11. The secondary pressure roller 30 can be fixedly connected to the rotor shaft 11 by means of snap-fit, bolt connection, etc. The secondary pressure roller 30 has a secondary pressure roller nose 31 and a secondary pressure roller back 32. When the secondary pressure roller 30 is assembled with the rotor shaft 11, the secondary pressure roller nose 31 and the secondary pressure roller back 32 can be arranged opposite to each other and spaced apart along a first direction. The secondary pressure roller nose 31 is located on the side of the secondary pressure roller 30 facing the motor 10, and the secondary pressure roller back 32 is located on the side of the secondary pressure roller nose 31 away from the motor 10. The gas compressed by the primary pressure roller 20 can flow to the secondary pressure roller 30. The secondary pressure roller 30 can be used to compress the gas compressed by the primary pressure roller 20. The pressure value of the gas compressed by the secondary pressure roller 30 is higher than the pressure value of the gas compressed by the primary pressure roller 20.

[0040] The third-stage pressure roller 40 can be fixed to the second end of the rotor shaft 11. The third-stage pressure roller 40 can be fixedly connected to the rotor shaft 11 by means of snap-fit, bolt connection, etc. The third-stage pressure roller 40 can be located on the side of the second-stage pressure roller 30 away from the motor 10. The third-stage pressure roller 40 has a third-stage pressure roller nose 41 and a third-stage pressure roller back 42. When the third-stage pressure roller 40 is assembled with the rotor shaft 11, the third-stage pressure roller nose 41 and the third-stage pressure roller back 42 can be arranged opposite to each other and spaced apart along a first direction. The third-stage pressure roller back 42 is located on the side of the third-stage pressure roller 40 facing the motor 10, and the third-stage pressure roller nose 41 is located on the side of the third-stage pressure roller back 42 away from the motor 10. The gas compressed by the second-stage pressure roller 30 can flow to the third-stage pressure roller 40, which can be used to compress the gas compressed by the second-stage pressure roller 30. The pressure value of the gas compressed by the third-stage pressure roller 40 is higher than the pressure value of the gas compressed by the second-stage pressure roller 30.

[0041] As an example, such as Figure 2As shown, the secondary pressure roller 30 can be sleeved on the rotor shaft 11, and the tertiary pressure roller 40 can be fixedly connected to the rotor shaft 11 by bolts. The secondary pressure roller 30 can be sandwiched between the tertiary pressure roller 40 and the motor 10. The secondary pressure roller 30 can have a second mounting hole 33, which can penetrate the secondary pressure roller 30 along a first direction. The rotor shaft 11 can pass through the second mounting hole 33 and abut against the inner wall of the second mounting hole 33, thereby allowing the secondary pressure roller 30 to be sleeved on the rotor shaft 11. The tertiary pressure roller 40 can have a third mounting hole 43, which can be located on the side of the tertiary pressure roller 40 facing the motor 10. The rotor shaft 11 can extend into the third mounting hole 43 and abut against the inner wall of the third mounting hole 43, thereby allowing the tertiary pressure roller 40 to be sleeved on the rotor shaft 11. The third-stage pressure roller 40 can have a second mounting hole 44, which can penetrate the third-stage pressure roller 40 along the first direction. The second mounting hole 44 and the third mounting hole 43 can be arranged opposite to each other and connected along the first direction. When the third-stage pressure roller 40 is sleeved on the rotor shaft 11, the fixing bolt can be inserted through the second mounting hole 44 and assembled with the rotor shaft 11. The third-stage pressure roller 40 and the rotor shaft 11 are fixedly connected. The second-stage pressure roller 30 is clamped between the third-stage pressure roller 40 and the motor 10, thereby achieving the effect that the rotor shaft 11 drives the second-stage pressure roller 30 and the third-stage pressure roller 40 to rotate together.

[0042] When the first-stage pressure roller 20, the second-stage pressure roller 30, and the third-stage pressure roller 40 rotate, each of them generates axial force. By setting the first-stage pressure roller 20 and the second-stage pressure roller 30 as closed impellers and the third-stage pressure roller 40 as an open impeller, with the back 22 of the first-stage pressure roller facing the motor 10 and the nose 31 of the second-stage pressure roller facing the motor 10, and the backs 32 of the second-stage pressure roller and the backs 42 of the third-stage pressure roller adjacent to each other, the rotor shaft 11 can be subjected to a smaller and more stable axial force, allowing the rotor shaft 11 to rotate stably, which is beneficial to improving the stability of the gas compression assembly 1 during operation. Furthermore, by setting the internal pressure of the motor 10 to be higher than the pressure of the back of the first-stage pressure roller 22 and the nose of the second-stage pressure roller 31, the probability of some gas leaking from the first-stage pressure roller 20 and the second-stage pressure roller 30 into the motor 10 can be reduced. If gas leaks from the motor 10 into the first-stage pressure roller 20 and the second-stage pressure roller 30, the leaked gas can be compressed within the first-stage pressure roller 20 and the second-stage pressure roller 30, which can realize the recovery and utilization of gas, which is beneficial to reducing gas loss and improving the working efficiency of the gas compression assembly 1.

[0043] In this embodiment, by setting a primary pressure roller 20, a secondary pressure roller 30, and a tertiary pressure roller 40, the gas can first be compressed in the primary pressure roller 20. The gas compressed by the primary pressure roller 20 flows to the secondary pressure roller 30, where it further compresses the gas, increasing its pressure. The gas then flows to the tertiary pressure roller 40, where it further compresses the gas, further increasing the pressure ratio. The gas compression assembly 1 can achieve staged compression of the gas, enabling the centrifugal compressor to achieve a higher pressure ratio. Furthermore, by arranging the primary pressure roller back 22 facing the motor 10, the secondary pressure roller nose 31 facing the motor 10, and the secondary and tertiary pressure roller backs 32 adjacent to each other, the rotor shaft 11 can be subjected to a smaller, more stable axial force, allowing for stable rotation of the rotor shaft 11. This also reduces gas loss, improving the stability and efficiency of the gas compression assembly 1 during operation. Furthermore, the rotor shaft 11 forms a weight-reduction space 111, which is beneficial to reducing the weight of the gas compression assembly 1.

[0044] As an example, the outer surface of the head of the fixing bolt is constructed as an arc surface, which can be a semi-circular structure. When the compressed gas flows through the fixing bolt, the probability of the fixing bolt obstructing the gas flow can be reduced, which is beneficial to improving the working efficiency of the gas compression assembly 1.

[0045] In some embodiments of the present invention, such as Figure 1 As shown, the motor 10 also has a housing 12 and a stator 13. The housing 12 defines a mounting cavity 121. The stator 13 is disposed in the mounting cavity 121 and fixed to the housing side wall 122 of the housing 12. The rotor shaft 11 is rotatably disposed in the housing 12 and passes through the housing 12. The housing side wall 122 forms a wire outlet hole 1221 that communicates with the mounting cavity 121. The wire outlet hole 1221 is located at the end of the housing side wall 122 away from the first stage pressure roller 20. The electrical connection wire of the stator 13 is installed in the wire outlet hole 1221.

[0046] The outer casing 12 defines a mounting cavity 121. The stator 13 is located within the mounting cavity 121 and can be fixedly connected to the side wall 122 of the outer casing 12 by bolts, snap-fit, or other means. The stator 13 can be sleeved on the rotor shaft 11, allowing the rotor shaft 11 to rotate relative to the stator 13. At least a portion of the rotor shaft 11 is located within the mounting cavity 121 and passes through the outer casing 12, allowing it to rotate relative to the outer casing 12. The stator 13 can be constructed as a coil and can be connected to an electrical connection wire 131. When the stator 13 is energized, a rotating magnetic field is generated inside the motor 10. The rotor shaft 11 can be made of magnet steel, and a hollow magnetically conductive mandrel can be installed in the weight-reduction space 111 of the rotor shaft 11. When the stator 13 is energized, a magnetic field is generated within the mounting cavity 121, and the mandrel can drive the rotor shaft 11 to rotate according to the direction of the magnetic field, thereby achieving the effect of driving the rotor shaft 11 to rotate.

[0047] The housing sidewall 122 can have a cable outlet hole 1221, which can communicate with the mounting cavity 121. The electrical connection wire 131 of the stator 13 can be installed in the cable outlet hole 1221, and the electrical connection wire 131 can pass through the cable outlet hole 1221 and be connected to the power supply, thereby achieving the effect of energizing the stator 13. The housing sidewall 122 of the housing body 12 can have a gas flow channel 60. When the gas compressed by the first-stage pressure roller 20 flows out of the first-stage pressure roller 20, the gas compressed by the first-stage pressure roller 20 can flow through the gas flow channel 60 to the end of the motor 10 near the second-stage pressure roller 30, so that the gas compressed by the first-stage pressure roller 20 can flow into the second-stage pressure roller 30. The cable outlet hole 1221 can be located at the end of the housing sidewall 122 away from the first-stage pressure roller 20, which can reduce the probability that the cable outlet hole 1221 affects the flow rate of the gas compressed by the first-stage pressure roller 20, reduce energy loss, and help improve the working efficiency of the gas compression assembly 1. In other words, the gas that has just been compressed by the first-stage pressure roller 20 has a high flow rate. If the outlet hole 1221 is located at the end of the shell sidewall 122 near the first-stage pressure roller 20, the outlet hole 1221 will obstruct the flow of the gas that has just flowed out of the first-stage pressure roller 20, resulting in energy loss.

[0048] As an example, a flow guiding component can be provided within the gas flow channel 60. This component can be located on the inner wall of the gas flow channel 60. The flow guiding component can guide the gas compressed by the primary pressure roller 20 towards the end of the shell sidewall 122 near the secondary pressure roller 30, ensuring stable gas flow. When the gas flows through the outlet hole 1221, the gas flow rate is not affected, which helps reduce energy loss. The flow guiding component can be constructed as a guide boss protruding from the inner wall of the gas flow channel 60. Multiple guide bosses can be present, allowing the gas within the gas flow channel 60 to be diverted and guided to the end of the shell sidewall 122 near the secondary pressure roller 30.

[0049] In some embodiments of the present invention, such as Figure 1 As shown, the motor 10 also has a housing 12, which has a mounting base 123 opposite to the secondary pressure roller 30. The rotor shaft 11 passes through the mounting base 123 and is rotatable relative to the mounting base 123. A flow guiding structure 1231 is formed on the surface of the mounting base 123 facing the secondary pressure roller 30. The flow guiding structure 1231 is configured to guide the gas compressed by the primary pressure roller 20 to the secondary pressure roller 30.

[0050] Along the first direction, the outer casing 12 has a mounting seat 123 opposite to the secondary pressure roller 30. The mounting seat 123 can be assembled with the shell sidewall 122 of the outer casing 12. The mounting seat 123 can be fixedly connected to the shell sidewall 122 by means of snap-fit, bolt connection, etc. The mounting seat 123 and the shell sidewall 122 can jointly define the mounting cavity 121. The mounting seat 123 can be formed with a first through hole, which can penetrate the mounting seat 123 along the thickness direction. The rotor shaft 11 can pass through the first through hole and can rotate relative to the mounting seat 123. As an example, a first air radial bearing 14 can be sleeved on the shaft section of the rotor shaft 11 near the second end. The first air radial bearing 14 can be installed in the first through hole and can be fixedly connected to the mounting seat 123 by bolts, positioning pins, etc. When the rotor shaft 11 rotates, the rotor shaft 11 can rotate relative to the first air radial bearing 14, thereby allowing the rotor shaft 11 to rotate relative to the mounting seat 123.

[0051] The mounting base 123 can be arranged adjacent to the outlet of the gas flow channel 60. The gas compressed by the first-stage pressure roller 20 flowing in the gas flow channel 60 can flow to the surface of the mounting base 123 facing the second-stage pressure roller 30. A flow guiding structure 1231 can be formed on the surface of the mounting base 123 facing the second-stage pressure roller 30. The flow guiding structure 1231 can guide the gas compressed by the first-stage pressure roller 20 to the second-stage pressure roller 30. In other words, the flow guiding structure 1231 can guide the gas flowing out of the gas flow channel 60 to the second-stage pressure roller 30, so that the gas compressed by the first-stage pressure roller 20 can flow into the second-stage pressure roller 30, which is beneficial to improving the efficiency of the gas compressed by the first-stage pressure roller 20 flowing into the second-stage pressure roller 30, and making the gas compressed by the first-stage pressure roller 20 compressible in the second-stage pressure roller 30.

[0052] In some embodiments of the present invention, the flow guiding structure 1231 may include a plurality of flow guiding blades, which are arranged around the rotor shaft 11 along the circumference of the mounting base 123.

[0053] The flow guiding structure 1231 may include multiple flow guiding blades, which can be arranged circumferentially along the mounting base 123, and each flow guiding blade can extend radially along the mounting base 123. When the rotor shaft 11 passes through the mounting base 123, the multiple flow guiding blades can be arranged around the rotor shaft 11, and the secondary pressure roller 30 is sleeved on the rotor shaft 11. The multiple flow guiding blades can divert the gas compressed by the primary pressure roller 20 and guide the gas compressed by the primary pressure roller 20 to the secondary pressure roller 30, thereby improving the efficiency of the gas compressed by the primary pressure roller 20 flowing into the secondary pressure roller 30, which is beneficial to improving the working efficiency of the gas compression assembly 1.

[0054] In some embodiments of the present invention, the motor 10 further includes a housing 12, wherein a cooling channel 1222 is formed in the housing sidewall 122 of the housing 12, and a heat dissipation structure is formed on the inner surface of the cooling channel 1222.

[0055] The motor 10 also has a housing 12, and a cooling channel 1222 is formed within the housing sidewall 122 of the housing 12. The cooling channel 1222 can be arranged around the mounting cavity 121, and cooling gas can flow within the cooling channel 1222. The cooling gas can be used to cool the motor 10, and the cooling gas can exchange heat with the inner surface of the cooling channel 1222. A heat dissipation structure can be formed on the inner surface of the cooling channel 1222. The heat dissipation structure can be constructed as a serrated structure protruding from the inner surface of the cooling channel 1222. By setting the heat dissipation structure, the contact area between the cooling gas and the cooling channel 1222 can be increased, which is beneficial to improving the heat dissipation efficiency of the motor 10.

[0056] As an example, the cooling channel 1222 can be connected to the mounting cavity 121, and the cooling gas in the cooling channel 1222 can flow into the mounting cavity 121. The cooling gas can cool part of the stator 13 and rotor shaft 11 in the mounting cavity 121, thereby achieving the effect of further cooling the motor 10, which is beneficial to improving the heat dissipation performance of the gas compression assembly 1.

[0057] In some embodiments of the present invention, such as Figure 1 As shown, the shell sidewall 122 may include an inner sidewall 1223 and an outer sidewall 1224. The outer sidewall 1224 is sleeved on the outside of the inner sidewall 1223 and is detachably connected to the inner sidewall 1223. A first groove is formed on the surface of the outer sidewall 1224 facing the inner sidewall 1223, and a second groove is formed on the surface of the inner sidewall 1223 facing the outer sidewall 1224. The first groove and the second groove are opposite to each other to define a cooling channel 1222.

[0058] Along the radial direction of the outer casing 12, the outer sidewall 1224 can be fitted onto the outer sidewall 1223. The outer sidewall 1224 can be connected to the inner sidewall 1223 by means of snap-fit, bolt connection, etc., and the outer sidewall 1224 and the inner sidewall 1223 are detachably connected. A first groove is formed on the surface of the outer sidewall 1224 facing the inner sidewall 1223, and the first groove is recessed inward toward the outer sidewall 1224. A second groove is formed on the surface of the inner sidewall 1223 facing the outer sidewall 1224, and the second groove is recessed inward toward the inner sidewall 1223. The first groove and the second groove can be arranged opposite to each other, and the first groove and the second groove can together define a cooling channel 1222, in which cooling gas can flow. By setting the outer sidewall 1224 and the inner sidewall 1223 to be detachably connected, it is convenient to process the heat dissipation structure on the inner surface of the cooling channel 1222, which helps to reduce production costs.

[0059] In some embodiments of the present invention, such as Figure 1 and Figure 3 As shown, the gas compression assembly 1 for the centrifugal compressor may further include: a shaft seal 50; the motor 10 also has a housing 12, the housing 12 having a mounting seat 123 opposite to the secondary pressure roller 30; the mounting seat 123 having a mounting through hole 1232; the rotor shaft 11 passing through the mounting through hole 1232 and rotatable relative to the mounting seat 123; the shaft seal 50 being sleeved on the rotor shaft 11 and mounted in the mounting through hole 1232; one of a sealing boss 51 and a sealing groove 1233 being formed on the outer side wall of the shaft seal 50; the other of a sealing boss 51 and a sealing groove 1233 being formed on the surface of the mounting through hole 1232 facing the outer side wall of the shaft seal 50; the sealing boss 51 being assembled into the sealing groove 1233 and having a clearance fit with the inner wall of the sealing groove 1233; there are multiple sealing bosses 51 and sealing grooves 1233; and the sealing bosses 51 and sealing grooves 1233 are arranged in a stepped manner along the axial direction of the rotor shaft 11.

[0060] Along the first direction, the outer casing 12 has a mounting seat 123 opposite to the secondary pressure roller 30. The mounting seat 123 can be fitted with the shell sidewall 122 of the outer casing 12. The mounting seat 123 can be fixedly connected to the shell sidewall 122 by means of snap-fit, bolt connection, etc. The mounting seat 123 and the shell sidewall 122 can jointly define the mounting cavity 121. The mounting seat 123 can be formed with a mounting through hole 1232 (i.e., the first through hole in the above embodiment). The mounting through hole 1232 can penetrate the mounting seat 123 along the thickness direction of the mounting seat 123. The rotor shaft 11 can pass through the mounting through hole 1232 and can rotate relative to the mounting seat 123. The shaft seal 50 can be made of aluminum alloy material and can be sleeved on the rotor shaft 11. The shaft seal 50 can be interference-fitted with the rotor shaft 11. When the rotor shaft 11 passes through the mounting through hole 1232, the shaft seal 50 can be located within the mounting through hole 1232, which can reduce the probability of gas leakage from the mounting cavity 121 to the secondary pressure roller 30. The outer wall of the shaft seal 50 has one of a sealing boss 51 and a sealing groove 1233 extending circumferentially along the shaft seal 50. The surface of the mounting through hole 1232 facing the outer wall of the shaft seal 50 has the other of the sealing boss 51 and the sealing groove 1233. This embodiment of the application uses the example of the outer wall of the shaft seal 50 having a sealing boss 51 and the surface of the mounting through hole 1232 facing the outer wall of the shaft seal 50 having a sealing groove 1233 for illustration.

[0061] The sealing boss 51 can be assembled into the sealing groove 1233. By setting the sealing boss 51 and the sealing groove 1233 to be assembled together, the probability of gas flowing from the mounting cavity 121 to the secondary pressure roller 30 can be reduced. When the rotor shaft 11 rotates, the rotor shaft 11 can drive the shaft seal 50 to rotate relative to the mounting base 123. There can be a gap between the sealing boss 51 and the inner wall of the sealing groove 1233. A small amount of gas in the mounting cavity 121 can flow into the gap between the sealing boss 51 and the inner wall of the sealing groove 1233. The gas can flow through the first air radial bearing 14, so that the first air radial bearing 14 can be cooled. If the gas flows to the secondary pressure roller 30, the gas can be compressed in the secondary pressure roller 30, realizing the effect of gas recycling and reducing gas loss.

[0062] There can be multiple sealing bosses 51 and multiple sealing grooves 1233. Each sealing boss 51 can be paired with a corresponding sealing groove 1233. The multiple sealing bosses 51 and sealing grooves 1233 can be arranged in a stepped manner along the axial direction of the rotor shaft 11. This stepped arrangement can extend the flow path of gas leaking from the mounting cavity 121 and reduce the gas flow rate to the secondary pressure roller 30.

[0063] In some embodiments of the present invention, the end face of the shaft seal 50 away from the first-stage pressure roller 20 is configured as a first abutting surface 52, and the inner surface of the mounting through hole 1232 is formed with a second abutting surface 1234. The first abutting surface 52 and the second abutting surface 1234 are opposite to each other along the axial direction of the rotor shaft 11, and the first abutting surface 52 and the second abutting surface 1234 abut against each other.

[0064] The first contact surface 52 and the second contact surface 1234 are arranged opposite each other along the first direction. The contact between the first contact surface 52 and the second contact surface 1234 can improve the sealing performance between the shaft seal 50 and the mounting base 123, which is beneficial to further reduce the gas flow to the secondary pressure roller 30 and improve the stability of the shaft seal 50 installation.

[0065] In some embodiments of the present invention, the gas compression assembly 1 for the centrifugal compressor may further include: a partition plate, which is sleeved on the rotor shaft 11 and located between the secondary pressure roller 30 and the tertiary pressure roller 40, so that the secondary pressure roller 30 and the tertiary pressure roller 40 are spaced apart.

[0066] A partition plate can be provided between the secondary pressure roller 30 and the tertiary pressure roller 40. The partition plate can separate the secondary pressure roller 30 and the tertiary pressure roller 40. The partition plate can be sleeved on the rotor shaft 11, thereby reducing the probability of gas flowing from the tertiary pressure roller 40 into the secondary pressure roller 30, which is beneficial to improving the safety of the gas compression assembly 1.

[0067] The partition plate can be assembled with the secondary pressure roller 30 and the tertiary pressure roller 40. As an example, the partition plate has a first side and a second side opposite to each other along a first direction. The first side can have one of a first mounting boss and a first mounting groove 321 formed therein. The surface of the secondary pressure roller back 32 facing the partition plate can have the other of a first mounting boss and a first mounting groove 321 formed therein. The first mounting boss can be assembled into the first mounting groove 321, and the first mounting boss can have a clearance fit with the first mounting groove 321. This embodiment of the application uses the example of a first mounting boss formed on the first side and a first mounting groove 321 formed on the surface of the secondary pressure roller back 32 facing the partition plate. The first mounting boss can be constructed as a ring structure, and the first mounting groove 321 can be constructed as a ring groove. There can be multiple first mounting bosses, which can be arranged sequentially along the radial direction of the partition plate. There can also be multiple first mounting grooves 321, which can be arranged sequentially along the radial direction of the secondary pressure roller back 32. Multiple first mounting bosses can be set one-to-one with multiple first mounting slots 321, and each first mounting boss has a corresponding first mounting slot 321 for assembly.

[0068] One of the second mounting boss and the second mounting groove 421 is formed on the second side surface. The other of the second mounting boss and the second mounting groove 421 is formed on the surface of the third-stage pressure roller back 42 facing the partition plate. The second mounting boss can be assembled into the second mounting groove 421, and the second mounting boss can be clearance-fitted with the second mounting groove 421. This embodiment of the application uses the formation of a second mounting boss on the second side surface and a second mounting groove 421 on the surface of the third-stage pressure roller back 42 facing the partition plate as an example. The second mounting boss can be constructed as a ring structure, and the second mounting groove 421 can be constructed as a ring groove. There can be multiple second mounting bosses, which can be arranged sequentially along the radial direction of the partition plate. There can also be multiple second mounting grooves 421, which can be arranged sequentially along the radial direction of the second-stage pressure roller back 32. Multiple second mounting bosses can be correspondingly arranged with multiple second mounting grooves 421, and each second mounting boss has a corresponding second mounting groove 421 for assembly.

[0069] The partition plate has one of a third mounting boss and a third mounting groove extending circumferentially along the rotor shaft 11 on its inner surface along the circumferential direction. The third mounting boss can be fitted into the third mounting groove, and the third mounting boss can be clearance-fitted into the third mounting groove. This embodiment of the application uses the example of a partition plate having a third mounting boss formed on its inner surface along the circumferential direction and a third mounting groove formed on the surface of the third mounting roller 40 facing the partition plate along the circumferential direction. There are multiple third mounting bosses and third mounting grooves, and each of the multiple third mounting bosses can be correspondingly set with a multiple third mounting groove. Both the third mounting bosses and third mounting grooves are arranged in a stepped manner along the axial direction of the rotor shaft 11.

[0070] By setting a clearance fit between the first mounting boss and the first mounting groove 321, and a clearance fit between the second mounting boss and the second mounting groove 421, the secondary pressure roller 30 and the tertiary pressure roller 40 can rotate smoothly relative to the partition plate. This helps to reduce the friction between the secondary pressure roller 30, the tertiary pressure roller 40 and the partition plate, and helps to extend the service life of the partition plate.

[0071] In some embodiments of the present invention, the motor 10 may include an air thrust bearing 70, a second air radial bearing 15, a back plate 80, and an end wall 90. The end wall 90 may be disposed opposite to and spaced apart from the mounting base 123 along a first direction. The mounting base 123, the end wall 90, and the housing side wall 122 together define a mounting cavity 121. The end wall 90 may be integrally formed with the inner side wall 1223. The end wall 90 may have a second through hole 91, through which the rotor shaft 11 may pass. The second air radial bearing 15 may be sleeved on the shaft section of the rotor shaft 11 near the first end, and the second air radial bearing 15 may be located within the second through hole 91. The second air radial bearing 15 may be fixedly connected to the end wall 90 by bolts, locating pins, etc. When the rotor shaft 11 rotates, the rotor shaft 11 may rotate relative to the second air radial bearing 15, thereby allowing the rotor shaft 11 to rotate relative to the end wall 90.

[0072] A back plate 80 can be disposed on the side of the end wall 90 opposite to the mounting base 123. The back plate 80 can be fixedly connected to the end wall 90 by bolts. The back plate 80 can form a third through hole 81. A first-stage pressure roller 20 can be disposed on the side of the back plate 80 opposite to the end wall 90. At least a portion of the first-stage pressure roller 20 can pass through the third through hole 81, and the back of the first-stage pressure roller 22 can abut against the back plate 80. At least a portion of the end wall 90 can be spaced apart from the back plate 80, and a gap is formed between the end wall 90 and the back plate 80. Along the first direction, an air thrust bearing 70 can be provided on the side of the second air radial bearing 15 opposite to the first air radial bearing 14. There can be two air thrust bearings 70, one of which can abut against the end wall 90, and the other can abut against the back plate 80. The two air thrust bearings 70 are located in the gap between the end wall 90 and the back plate 80. Two air thrust bearings 70 can be fixed to the end wall 90 and the back plate 80 respectively by locating pins. A thrust plate 71 can be provided between the two air thrust bearings 70. The two air thrust bearings 70 are spaced apart, and the air thrust bearings 70 can support the rotor shaft 11 and reduce the axial movement of the rotor shaft 11. By placing the two air thrust bearings 70 in the gap between the end wall 90 and the back plate 80, it is beneficial to reduce the length of the motor 10 along the first direction and reduce the space occupied by the motor 10.

[0073] As an example, the inner wall of the third through hole 81 has one of a fourth mounting boss and a fourth mounting groove extending circumferentially along the back plate 80. The surface of the first-stage pressure roller 20 opposite to the inner wall of the third through hole 81 along the circumferential direction has the other of a fourth mounting boss and a fourth mounting groove. The fourth mounting boss can be assembled into the fourth mounting groove, and the fourth mounting boss can be clearance-fitted with the fourth mounting groove. This application embodiment is described with the example of the fourth mounting groove being formed on the inner wall of the third through hole 81 and the fourth mounting boss being formed on the surface of the first-stage pressure roller 20 opposite to the inner wall of the third through hole 81 along the circumferential direction. There can be multiple fourth mounting bosses and fourth mounting grooves. Multiple fourth mounting bosses can be arranged one-to-one with multiple fourth mounting grooves. Both the fourth mounting bosses and fourth mounting grooves can be arranged sequentially along the first direction.

[0074] According to a second aspect of the present invention, a centrifugal compressor includes the gas compression assembly 1 described in the above embodiments.

[0075] According to the embodiments of this application, the centrifugal compressor using the gas compression component 1 in the above embodiments can increase the pressure ratio of the centrifugal compressor, which is beneficial to improving working efficiency and reducing costs.

[0076] Other configurations and operations of the gas compression assembly 1 and the centrifugal compressor according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A gas compression assembly for a centrifugal compressor, characterized in that, include: An electric motor (10) having a rotor shaft (11) having a weight-reduction space (111); A primary pressure roller (20) is fixed to the first end of the rotor shaft (11). The primary pressure roller (20) has a primary pressure roller nose (21) and a primary pressure roller back (22). The primary pressure roller nose (21) is located on the side of the primary pressure roller back (22) away from the motor (10). A secondary pressure roller (30) is fixed to the second end of the rotor shaft (11). The secondary pressure roller (30) has a secondary pressure roller nose (31) and a secondary pressure roller back (32). The secondary pressure roller back (32) is located on the side of the secondary pressure roller nose (31) away from the motor (10). The secondary pressure roller (30) is used to compress the gas compressed by the primary pressure roller (20). A third-stage pressure roller (40) is fixed to the second end of the rotor shaft (11) and located on the side of the second-stage pressure roller (30) away from the motor (10). The third-stage pressure roller (40) has a third-stage pressure roller nose (41) and a third-stage pressure roller back (42). The third-stage pressure roller nose (41) is located on the side of the third-stage pressure roller back (42) away from the motor (10). The third-stage pressure roller (40) is used to compress the gas compressed by the second-stage pressure roller (30). The motor (10) also has a housing (12) that defines a mounting cavity (121). A cooling channel (1222) is formed in the sidewall (122) of the housing (12) and the cooling channel (1222) communicates with the mounting cavity (121). A partition plate is sleeved on the rotor shaft (11) and located between the secondary pressure roller (30) and the tertiary pressure roller (40) to separate the secondary pressure roller (30) and the tertiary pressure roller (40); The partition plate has a first side and a second side opposite to each other. The first side has one of a first mounting boss and a first mounting groove (321). The surface of the back of the secondary pressure roller (32) facing the partition plate has the other of the first mounting boss and the first mounting groove (321). The first mounting boss is fitted into the first mounting groove (321). The second side has one of a second mounting boss and a second mounting groove (421). The surface of the back of the tertiary pressure roller (42) facing the partition plate has the other of the second mounting boss and the second mounting groove (421). The second mounting boss is fitted into the second mounting groove (421). The inner surface of the partition plate along the circumferential direction has one of a third mounting boss and a third mounting groove extending circumferentially along the rotor shaft (11). The surface of the tertiary pressure roller (40) along the circumferential direction facing the partition plate has the other of the third mounting boss and the third mounting groove. The third mounting boss is fitted into the third mounting groove.

2. The gas compression assembly according to claim 1, characterized in that, The motor (10) also has a stator (13), which is disposed in the mounting cavity (121) and fixed to the housing sidewall (122). The rotor shaft (11) is rotatably disposed in the housing body (12) and passes through the housing body (12). The housing sidewall (122) has a wire outlet hole (1221) communicating with the mounting cavity (121). The wire outlet hole (1221) is located at the end of the housing sidewall (122) away from the first stage pressure roller (20). The electrical connection wire of the stator (13) is installed in the wire outlet hole (1221).

3. The gas compression assembly according to claim 1, characterized in that, The outer casing (12) has a mounting base (123) opposite to the secondary pressure roller (30), the rotor shaft (11) passes through the mounting base (123) and is rotatable relative to the mounting base (123), and a flow guiding structure (1231) is formed on the surface of the mounting base (123) facing the secondary pressure roller (30), the flow guiding structure (1231) is configured to guide the gas compressed by the primary pressure roller (20) to the secondary pressure roller (30).

4. The gas compression assembly according to claim 3, characterized in that, The flow guiding structure (1231) includes a plurality of flow guiding blades, which are arranged around the rotor shaft (11) along the circumference of the mounting base (123).

5. The gas compression assembly according to claim 1, characterized in that, The inner surface of the cooling channel (1222) has a heat dissipation structure.

6. The gas compression assembly according to claim 5, characterized in that, The shell sidewall (122) includes an inner sidewall (1223) and an outer sidewall (1224). The outer sidewall (1224) is sleeved on the outside of the inner sidewall (1223) and is detachably connected to the inner sidewall (1223). A first groove is formed on the surface of the outer sidewall (1224) facing the inner sidewall (1223), and a second groove is formed on the surface of the inner sidewall (1223) facing the outer sidewall (1224). The first groove and the second groove are opposite to each other to define the cooling channel (1222).

7. The gas compression assembly according to claim 1, characterized in that, Also includes: The shaft seal (50) has a mounting base (123) opposite to the secondary pressure roller (30) in the outer shell (12). The mounting base (123) has a mounting through hole (1232). The rotor shaft (11) passes through the mounting through hole (1232) and is rotatable relative to the mounting base (123). The shaft seal (50) is sleeved on the rotor shaft (11) and installed in the mounting through hole (1232). The outer side wall (1224) of the shaft seal (50) has one of a sealing boss (51) and a sealing groove (1233). The mounting through hole (1232) facing the outer side wall (1224) of the shaft seal (50) has one of the sealing boss (51) and the sealing groove (1233). The sealing boss (51) is assembled into the sealing groove (1233) and has a clearance fit with the inner wall of the sealing groove (1233). There are multiple sealing bosses (51) and sealing grooves (1233). Both the sealing bosses (51) and the sealing grooves (1233) are arranged in a stepped manner along the axial direction of the rotor shaft (11).

8. The gas compression assembly according to claim 7, characterized in that, The end face of the shaft seal (50) facing away from the first-stage pressure roller (20) is configured as a first abutting surface (52), and the inner surface of the mounting through hole (1232) is formed with a second abutting surface (1234). The first abutting surface (52) and the second abutting surface (1234) are opposite to each other along the axial direction of the rotor shaft (11), and the first abutting surface (52) and the second abutting surface (1234) abut against each other.

9. A centrifugal compressor, characterized in that, Includes the gas compression assembly (1) according to any one of claims 1-8.

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