A centrifugal gas compressor system driven by a high speed asynchronous motor

Abstract

The utility model provides a kind of centrifugal gas compressor system under high-speed asynchronous motor drive belongs to gas compression and gas delivery energy chemical industry. Solve the existing compressor compressor needs transmission, needs variable speed, leakage risk is big, overall volume is big, system efficiency is low, system power is low and other problems. It includes shaft, high-speed asynchronous motor and centrifugal compressor diffuser and shell, high-speed asynchronous motor is connected with centrifugal compressor diffuser by shaft and all is installed in shell, high-speed asynchronous motor includes stator core and rotor core, stator core is installed in rotor core outside, impeller is installed on the shaft, diffuser shell is installed in impeller outside, clearance portion of impeller and diffuser shell is equipped with baffle, one end of diffuser shell near air inlet side air passage baffle is equipped with air inlet, one end of diffuser shell near air outlet side air passage baffle is equipped with exhaust port. It is mainly used to reduce the risk of compressor leakage.

Description

Technical Field

[0001] This utility model belongs to the field of gas compression and gas transportation in the energy and chemical industry, and in particular relates to a centrifugal gas compressor system driven by a high-speed asynchronous motor. Background Technology

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. It is widely used in various fields such as fluid transportation, chemical industry, industrial gas supply, and automotive industry. Some special fields require the supplied gas to be clean and oil-free. Considering the characteristics of the transported medium, such as flammability, explosiveness, toxicity, or corrosiveness, there are also high requirements for the leakage prevention of the supply system. However, current compressor systems consisting of a driver + compressor or a low-speed motor + speed changer + compressor have some problems in practical applications. For example, the transmission efficiency affects the system efficiency, reducing the overall system efficiency; the non-direct connection of the system results in a large overall volume due to its non-compact size; and the large overall volume makes it difficult to ensure the system's sealing performance, leading to low system reliability. Utility Model Content

[0003] In view of this, the present invention aims to propose a centrifugal gas compressor system driven by a high-speed asynchronous motor, so as to solve the problems of existing compressors that require transmission, speed change, high risk of leakage, large overall size, low system efficiency, and low system power.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A centrifugal gas compressor system driven by a high-speed asynchronous motor includes a shaft, a high-speed asynchronous motor, a centrifugal compressor diffuser, and a housing. The high-speed asynchronous motor and the centrifugal compressor diffuser are connected by the shaft and both are installed inside the housing. The high-speed asynchronous motor includes a stator core and a rotor core. The stator core is installed outside the rotor core, and the rotor core is installed on the shaft. The centrifugal compressor diffuser includes an outlet-side air duct baffle, an impeller, a diffuser housing, a baffle, and an inlet-side air duct baffle. The impeller is installed on the shaft, and the diffuser housing is installed outside the impeller. An outlet-side air duct baffle is installed at one end of the impeller, and an inlet-side air duct baffle is installed at the other end. Both the outlet-side and inlet-side air duct baffles are connected to the diffuser housing. A baffle is installed at the gap between the impeller and the diffuser housing. An air inlet is provided at one end of the diffuser housing near the inlet-side air duct baffle, and an exhaust port is provided at one end of the diffuser housing near the outlet-side air duct baffle.

[0005] Furthermore, the air outlet side air passage partition is provided with an air outlet side shaft labyrinth seal at the connection between the air outlet side air passage partition and the shaft.

[0006] Furthermore, an impeller labyrinth seal is provided between the impeller and the partition plate.

[0007] Furthermore, a shaft seal is provided at the connection between the intake-side air passage partition and the shaft, and a retaining ring is installed at the end of the shaft seal away from the intake-side air passage partition.

[0008] Furthermore, a second end cap is installed at both ends of the housing, and a first end cap is installed at the center of the second end cap.

[0009] Furthermore, the second end cap and the housing are sealed with a second end cap O-ring I and a second end cap O-ring II, and connected by a second end cap sealing screw.

[0010] Furthermore, the first end cap and the second end cap are sealed using a first end cap O-ring I and a first end cap O-ring II.

[0011] Furthermore, a motor-side electromagnetic bearing is provided on the outer side of one end of the shaft where the rotor core is mounted, and an impeller-side electromagnetic bearing is provided on the outer side of one end of the shaft where the impeller is mounted.

[0012] Furthermore, an O-ring is provided between the diffuser housing and the housing.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adopts a high-speed asynchronous motor and a centrifugal compressor directly connected coaxially, eliminating the speed change and transmission links, avoiding intermediate losses, and making the system compact, highly reliable, with low leakage risk and low leakage rate. The centrifugal gas compressor system driven by the high-speed asynchronous motor solves the problems of the original compressor requiring transmission and speed change, high leakage risk, large overall size, low system efficiency, and low system power, thus improving the economy and reliability of the compressor system.

[0014] 2. This utility model uses contactless electromagnetic bearing support. Since there is no intermediate transmission link, the reliability and efficiency of the entire system are improved, and the problems of damage to transmission components and energy consumption in the transmission link are solved. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of a centrifugal gas compressor system driven by a high-speed asynchronous motor. Figure 2 A schematic diagram showing the coaxial connection between a high-speed asynchronous motor and a centrifugal compressor diffuser. Figure 3 A schematic diagram showing the installation of an electromagnetic bearing and an O-ring seal. Figure 4 This is a diagram showing the gas flow direction inside the diffuser of a centrifugal compressor. Figure 5 This is a schematic diagram of the labyrinth seal cross-section structure on the outer side of the impeller.

[0016] In the picture: 1-Shaft, 2-Stator core, 3-Rotor core, 4-Outlet side shaft labyrinth seal, 5-Outlet side air passage baffle, 6-Impeller, 7-Diffuser housing, 8-Baffle, 9-Impeller outer labyrinth seal, 10-Shaft seal, 11-Inlet side air passage baffle, 12-Steel retainer, 13-Motor side electromagnetic bearing, 14-O-ring seal, 15-Impeller side electromagnetic bearing, 16-First end cover, 17-First end cover O-ring seal I, 18-First end cover O-ring seal II, 19-Second end cover, 20-Second end cover O-ring seal I, 21-Second end cover O-ring seal II, 22-Housing, 23-Second end cover sealing screw, 24-Exhaust port, 25-Inlet port. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0018] Detailed Implementation Method 1: See Figure 1-5 This embodiment describes a centrifugal gas compressor system driven by a high-speed asynchronous motor, comprising a shaft 1, a high-speed asynchronous motor, a centrifugal compressor diffuser, and a housing 22. The high-speed asynchronous motor and the centrifugal compressor diffuser are connected via the shaft 1 and both are installed within the housing 22. The high-speed asynchronous motor includes a stator core 2 and a rotor core 3. The stator core 2 is installed outside the rotor core 3, and the rotor core 3 is installed on the shaft 1. The centrifugal compressor diffuser includes an outlet-side gas duct baffle 5, an impeller 6, a diffuser housing 7, a baffle 8, and... An intake-side air duct baffle 11 is provided. The impeller 6 is mounted on the shaft 1. The diffuser housing 7 is mounted on the outside of the impeller 6. An exhaust-side air duct baffle 5 is installed at one end of the impeller 6, and an intake-side air duct baffle 11 is installed at the other end. Both the exhaust-side air duct baffle 5 and the intake-side air duct baffle 11 are connected to the diffuser housing 7. A baffle 8 is installed at the gap between the impeller 6 and the diffuser housing 7. An air inlet 25 is provided at the end of the diffuser housing 7 near the intake-side air duct baffle 11, and an exhaust outlet 24 is provided at the end of the diffuser housing 7 near the exhaust-side air duct baffle 5.

[0019] Furthermore, an outlet-side axial labyrinth seal 4 is provided at the connection between the outlet-side air passage baffle 5 and the shaft 1, an impeller outer labyrinth seal 9 is provided between the impeller 6 and the baffle 8, and an axial seal 10 is provided at the connection between the inlet-side air passage baffle 11 and the shaft 1. A retaining ring 12 is installed at the end of the axial seal 10 away from the inlet-side air passage baffle 11.

[0020] Furthermore, a high-speed asynchronous motor refers to an asynchronous motor with a rated speed or long-term operating speed higher than 3000 r / min. The number of compression stages of the centrifugal compressor diffuser can be single-stage, two-stage, three-stage or even multi-stage. The exhaust pressure of the exhaust port 24 ranges from 0.11 MPa to several hundred MPa, and the impeller 6 adopts an n-stage impeller.

[0021] A high-speed asynchronous motor and a centrifugal compressor diffuser are connected by shaft 1. When shaft 1 rotates, it directly drives impeller 6 to rotate at the same speed. Impeller 6 accelerates the gas, converting kinetic energy into pressure energy. The gas pressure increases through each impeller 6 stage. The outlet-side shaft labyrinth seal 4, outlet-side air passage baffle 5, baffle 8, impeller outer labyrinth seal 9, shaft seal 10, and diffuser housing 7 are matched according to the compression stage requirements to form a gas passage. The gas is pressurized once each time it flows through impeller 6 in the passage. After flowing through n impellers 6 and being pressurized n times, it is discharged. The retaining ring 12 fixes the axial position of the centrifugal compressor diffuser, and the radial position is fixed by a pin. The gas flows in from the inlet 25, is accelerated by impeller 6, and is discharged from the outlet 24. The pressure at the inlet 25 is P. 进气 The pressure at exhaust port 24 is P. 排气 During this centrifugal compression process, the gas pressure rises to ΔP = P 排气 -P 进气 .

[0022] By directly connecting a high-speed asynchronous motor to the centrifugal compressor on the same axis, the speed change and transmission links are eliminated, avoiding intermediate losses. The system has a compact structure, high reliability, low leakage risk, and low leakage rate. The centrifugal gas compressor system driven by the high-speed asynchronous motor solves the problems of the original compressor, such as the need for transmission and speed change, high leakage risk, large overall size, low system efficiency, and low system power. It improves the economy and reliability of the compressor system, ensures an extremely low leakage rate, and directly drives the impeller 6 through the high-speed asynchronous motor. The high power density of the motor ensures the compactness of the system.

[0023] Furthermore, the shaft seal 10 adopts a labyrinth seal, and with appropriate fitting, it achieves a better sealing effect, which is beneficial for pressure increase and reducing leakage loss.

[0024] Detailed Implementation Method 2: See Figure 1-5In this embodiment, a second end cap 19 is installed at both ends of the housing 22, and a first end cap 16 is installed at the center of the second end cap 19. The second end cap 19 and the housing 22 are sealed by a second end cap O-ring seal I 20 and a second end cap O-ring seal II 21 and connected by a second end cap sealing screw 23. The first end cap 16 and the second end cap 19 are sealed by a first end cap O-ring seal I 17 and a first end cap O-ring seal II 18. This isolates the high-speed asynchronous motor and centrifugal compressor diffuser in the system from the outside world, forming a pressure vessel to ensure the safety and sealing of the system.

[0025] In this embodiment, an O-ring 14 is provided between the diffuser housing 7 and the housing 22. The O-ring 14 isolates the air inlet 25 from the exhaust port 24, achieving a crucial static seal.

[0026] Detailed implementation method 3: See Figure 1-5 In this embodiment, a motor-side electromagnetic bearing 13 is provided on the outer side of one end of the shaft 1 where the rotor core 3 is mounted, and an impeller-side electromagnetic bearing 15 is provided on the outer side of one end of the shaft 1 where the impeller 6 is mounted. The motor-side electromagnetic bearing 13 and the impeller-side electromagnetic bearing 15 enable contactless operation of the high-speed motor shaft, eliminating shaft friction loss and improving system efficiency.

[0027] The specific embodiments of this utility model disclosed above are merely illustrative of the present utility model. These specific embodiments do not exhaustively describe all details, nor do they limit the utility model to only the described embodiments. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.

Claims

1. A centrifugal gas compressor system driven by a high-speed asynchronous motor, characterized in that: The system includes a shaft (1), a high-speed asynchronous motor, a centrifugal compressor diffuser, and a housing (22). The high-speed asynchronous motor and the centrifugal compressor diffuser are connected by the shaft (1) and are both installed inside the housing (22). The high-speed asynchronous motor includes a stator core (2) and a rotor core (3). The stator core (2) is installed outside the rotor core (3), and the rotor core (3) is installed on the shaft (1). The centrifugal compressor diffuser includes an outlet side air duct baffle (5), an impeller (6), a diffuser housing (7), a baffle (8), and an inlet side air duct baffle (11). The impeller (6) is installed on the shaft (11). On the shaft (1), the diffuser housing (7) is installed on the outside of the impeller (6). One end of the impeller (6) is equipped with an outlet side air passage baffle (5), and the other end is equipped with an inlet side air passage baffle (11). Both the outlet side air passage baffle (5) and the inlet side air passage baffle (11) are connected to the diffuser housing (7). A baffle (8) is installed at the gap between the impeller (6) and the diffuser housing (7). The diffuser housing (7) is provided with an air inlet (25) at one end near the inlet side air passage baffle (11), and an exhaust port (24) is provided at one end near the outlet side air passage baffle (5).

2. The centrifugal gas compressor system driven by a high-speed asynchronous motor according to claim 1, characterized in that: The air outlet side air passage partition (5) is provided with an air outlet side shaft labyrinth seal (4) at the connection between the air outlet side air passage partition (5) and the shaft (1).

3. The centrifugal gas compressor system driven by a high-speed asynchronous motor according to claim 1, characterized in that: An impeller outer labyrinth seal (9) is provided between the impeller (6) and the partition (8).

4. A centrifugal gas compressor system driven by a high-speed asynchronous motor according to claim 1, characterized in that: A shaft seal (10) is provided at the connection between the intake side air passage partition (11) and the shaft (1), and a retaining ring (12) is installed at the end of the shaft seal (10) away from the intake side air passage partition (11).

5. A centrifugal gas compressor system driven by a high-speed asynchronous motor according to claim 1, characterized in that: The housing (22) is equipped with a second end cap (19) at both ends, and a first end cap (16) is installed at the center of the second end cap (19).

6. A centrifugal gas compressor system driven by a high-speed asynchronous motor according to claim 5, characterized in that: The second end cap (19) and the housing (22) are sealed by the second end cap O-ring I (20) and the second end cap O-ring II (21) and connected by the second end cap sealing screw (23).

7. A centrifugal gas compressor system driven by a high-speed asynchronous motor according to claim 5, characterized in that: The first end cap (16) and the second end cap (19) are sealed by a first end cap O-ring I (17) and a first end cap O-ring II (18).

8. A centrifugal gas compressor system driven by a high-speed asynchronous motor according to claim 1, characterized in that: The outer side of one end of the shaft (1) where the rotor core (3) is mounted is provided with a motor-side electromagnetic bearing (13), and the outer side of one end of the shaft (1) where the impeller (6) is mounted is provided with an impeller-side electromagnetic bearing (15).

9. A centrifugal gas compressor system driven by a high-speed asynchronous motor according to claim 1, characterized in that: An O-ring (14) is provided between the diffuser housing (7) and the housing (22).

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