Large-flow gear speed-increasing centrifugal compressor

Abstract

The utility model relates to the technical field of compressors, in particular to a large-flow gear speed-increasing centrifugal compressor which comprises a machine base, a motor, a speed-increasing gear box, a first machine head and a second machine head are arranged on the machine base, and a low-speed shaft, a first high-speed shaft and a second high-speed shaft are rotatably arranged in the speed-increasing gear box. The low-speed shaft is connected with an output shaft of the motor, the first high-speed shaft is connected with the first machine head, the second high-speed shaft is connected with the second machine head, a low-speed gear is arranged on the low-speed shaft, a first high-speed gear is arranged on the first high-speed shaft, and a second high-speed gear is arranged on the second high-speed shaft. The first high-speed gear and the second high-speed gear are meshed with the low-speed gear, and an electric turning gear is arranged on the speed-increasing gear box and connected with a first high-speed shaft. The compressor has the effects of reducing the cost of the compressor and improving the efficiency of the compressor.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field especially is related to a large flow gear speed increasing type centrifugal compressor. BACKGROUND

[0002] As the key equipment of gas compression system, the compressor plays an indispensable role in the electric power, metallurgy, chemical industry and other industries. With the continuous progress of modern industrial technology and the continuous expansion of process system scale, the performance and specification requirements of the compressor are increasingly improved, especially the demand for large-scale and high-efficiency is more and more significant. This trend directly promotes the development of the compressor to a larger scale and higher efficiency.

[0003] At present, there are two types of large compressors in the market. One is to use multiple compressors in parallel, which will increase the pipe network resistance, reduce the efficiency, prolong the starting time, increase the investment cost and occupy a large area. The other is to use the compressor with back-to-back impeller structure, which has long manufacturing cycle, complex manufacturing process, high price and high maintenance cost. UTILITY MODEL CONTENTS

[0004] In order to reduce the cost of the compressor and improve the efficiency of the compressor, the application provides a large flow gear speed increasing type centrifugal compressor.

[0005] The large flow gear speed increasing type centrifugal compressor provided by the application adopts the following technical scheme:

[0006] A large flow gear speed increasing type centrifugal compressor, comprising a base, an electric motor, a speed increasing gear box, a first machine head and a second machine head are arranged on the base, a low speed shaft, a first high speed shaft and a second high speed shaft are arranged in rotation in the speed increasing gear box, the low speed shaft is connected with the output shaft of the electric motor, the first high speed shaft is connected with the first machine head, the second high speed shaft is connected with the second machine head, a low speed gear is arranged on the low speed shaft, a first high speed gear is arranged on the first high speed shaft, a second high speed gear is arranged on the second high speed shaft, the first high speed gear and the second high speed gear are engaged with the low speed gear, an electric turning gear is arranged on the speed increasing gear box, and the electric turning gear is connected with the first high speed shaft.

[0007] By adopting the above technical scheme, when the low-speed shaft drives the low-speed gear to rotate, the low-speed gear drives the first high-speed gear and the second high-speed gear to rotate synchronously, the first high-speed gear drives the rotor in the first motor head to rotate through the first high-speed shaft, and the second high-speed gear drives the rotor in the second motor head to rotate through the second high-speed shaft; when the motor stops running, the electric turning gear drives the first high-speed shaft to rotate at low speed, and drives the second high-speed shaft and the low-speed shaft to rotate at low speed, thereby reducing the situation that the first high-speed shaft, the second high-speed shaft and the low-speed shaft are stationary for a long time, reducing the situation that the first high-speed shaft, the second high-speed shaft and the low-speed shaft are bent and deformed due to gravity, and at the same time, the first high-speed shaft drives the rotor in the first motor head to rotate at low speed, and the second high-speed shaft drives the rotor in the second motor head to rotate at low speed, before the rotor in the first motor head and the rotor in the second motor head rotate at high speed, on one hand, the rotor in the first motor head and the rotor in the second motor head are checked for jamming, and on the other hand, the problem of large starting torque and large impact on the power grid is solved, thereby improving the reliability and safety of the compressor operation; when the motor drives the low-speed shaft to rotate, the first high-speed shaft and the second high-speed shaft rotate synchronously at high speed, the first high-speed shaft drives the rotor in the first motor head to rotate at high speed, and the second high-speed shaft drives the rotor in the second motor head to rotate at high speed, thereby doing work on the gas in the first motor head and the second motor head, and obtaining high-pressure gas equivalent to two compressors of the same type, thereby improving the compression efficiency, reducing one speed-increasing gear box and one motor compared with two sets of compressors, saving the manufacturing cost, and reducing the land occupation of the compressor, thereby reducing the cost of the compressor and improving the efficiency of the compressor.

[0008] Preferably, the first motor head comprises a first volute and a first impeller, the first volute is arranged on the base, and the first impeller is arranged in the first volute and connected with the first high-speed shaft; the second motor head comprises a second volute and a second impeller, the second volute is arranged on the base, and the second impeller is arranged in the second volute and connected with the second high-speed shaft; and the first volute and the second volute are both provided with an inlet and an outlet.

[0009] By adopting the technical scheme, the gas enters the first volute and the second volute through the inlet, flows in the first impeller and the second impeller, the first high-speed shaft drives the first impeller to rotate, the second high-speed shaft drives the second impeller to rotate, mechanical energy is converted into pressure energy and kinetic energy of the gas, the pressure, velocity and temperature of the gas are all improved, then the gas is expanded in the first volute and the second volute to further improve the pressure, and the gas is discharged from the first volute and the second volute at high temperature and high pressure, the first impeller and the second impeller are integral back-bent semi-open type, the efficiency is high and the flow resistance loss is small, the first impeller is toothed with the first high-speed shaft, the second impeller is toothed with the second high-speed shaft, the toothed connection mode improves the stability and efficiency of power transmission, the first high-speed shaft and the second high-speed shaft bear greater torque and rotational speed, and the first machine head and the second machine head operate efficiently.

[0010] Preferably, the first volute top and the second volute top are both provided with lifting lugs.

[0011] By adopting the technical scheme, the first volute and the second volute are upper and lower split type, when overhauled, the upper half of the first volute and the second volute is lifted up through the lifting lugs, the first impeller and the second impeller can be observed, and thus the first machine head and the second machine head are convenient to install and maintain.

[0012] Preferably, the first coupling is arranged between the first impeller and the first high-speed shaft, the second coupling is arranged between the second impeller and the second high-speed shaft, and the third coupling is arranged between the low-speed shaft and the output shaft of the motor, and the first coupling, the second coupling and the third coupling are all diaphragm couplings.

[0013] By adopting the technical scheme, the first coupling makes the first impeller and the first high-speed shaft rotate together and transmit torque, the second coupling makes the second impeller and the second high-speed shaft rotate together and transmit torque, and the third coupling makes the output shaft of the motor and the low-speed shaft rotate together and transmit torque, and the first coupling, the second coupling and the third coupling are all diaphragm couplings, the diaphragm couplings can transmit large torque and have thermal compensation.

[0014] Preferably, a coupling protector is arranged on each of the first coupling, the second coupling and the third coupling.

[0015] By adopting the technical scheme, the coupling protector reduces the accidental contact of personnel with the high-speed rotating first coupling, the second coupling and the third coupling.

[0016] As preferred, the base comprises a motor base, a gear box base, a first bearing base and a second bearing base, the motor is arranged on the motor base, the speed increasing gear box is arranged on the gear box base, the first bearing base is arranged with a first bearing seat, the first bearing seat is rotationally connected with the first impeller, the second bearing base is arranged with a second bearing seat, the second bearing seat is rotationally connected with the second impeller.

[0017] By adopting the above technical scheme, the first bearing seat supports the first impeller, the second bearing seat supports the second impeller, the first bearing base supports the first volute, and the second bearing base supports the second volute, so that the first head and the second head can stably operate, the motor base, the gear box base, the first bearing base and the second bearing base are independent of each other, on the one hand, the load can be evenly borne, and vibration transmission can be reduced, on the other hand, the height and the levelness can be adjusted, and when the compressor is installed, the adjustment can be made according to the actual situation, so that the installation requirements of the compressor can be met.

[0018] As preferred, the first bearing base and the second bearing base are both fixedly arranged with an adjusting seat, the adjusting seat is arranged with an adjusting hole, the adjusting hole is arranged with a supporting rod, and the supporting rod is arranged with a supporting seat, wherein the top of one of the supporting seats is used for abutting against the bottom of the first volute, and the top of the other supporting seat is used for abutting against the bottom of the second volute.

[0019] By adopting the above technical scheme, the supporting rod is adjusted so that the supporting seat abuts against the first volute and the second volute, thereby supporting the first volute and the second volute and providing an auxiliary effect for the stable operation of the first head and the second head.

[0020] As preferred, the supporting rod is threadedly connected with an adjusting nut, and the bottom of the adjusting nut is used for abutting against the top of the adjusting seat.

[0021] By adopting the above technical scheme, when the adjusting nut is rotated, the adjusting nut moves along the height direction of the supporting rod, and the bottom of the adjusting nut abuts against the top of the adjusting seat, thereby adjusting the distance between the supporting seat and the adjusting seat.

[0022] In summary, the present application has at least one of the following beneficial technical effects:

[0023] 1. By arranging the base, the motor, the speed increasing gear box, the first head, the second head, the low-speed shaft, the first high-speed shaft, the second high-speed shaft, the low-speed gear, the first high-speed gear, the second high-speed gear and the electric turning gear, high-pressure gas equivalent to two same type compressors is obtained, the compression efficiency is improved, compared with two sets of compressors, one speed increasing gear box and one motor are reduced, the manufacturing cost is saved, the land occupation of the compressor is reduced, the compressor cost is reduced, and the compressor efficiency is improved.

[0024] 2. By setting the motor base, gear box base, first bearing base, second bearing base, first bearing seat and second bearing seat, the first head and the second head are stably operated, the vibration transmission is reduced, and the installation requirements of the compressor are facilitated to be realized;

[0025] 3. By setting the adjusting seat, adjusting hole, supporting rod, supporting seat and adjusting nut, the first volute and the second volute are supported, and an auxiliary role is provided for the stable operation of the first head and the second head;

[0026] 4. The large-flow gear speed-increasing type centrifugal compressor of the application is axially inhaled and vertically exhaled, is more convenient to arrange, and has a simple overall structure;

[0027] 5. The large-flow gear speed-increasing type centrifugal compressor of the application adopts integrated design, has compact structure, small land occupation, can achieve greater flow and pressure, improves the compression efficiency, and widens the application field of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a large-flow gear speed-increasing type centrifugal compressor structure schematic diagram in the embodiment of the application.

[0029] Figure 2 is a cross-sectional view of the embodiment of the application, which embodies the connection relationship between the first high-speed shaft and the second high-speed shaft.

[0030] Figure 3 is a schematic diagram of the embodiment of the application, which embodies the position relationship between the first bearing seat and the second bearing seat.

[0031] Figure 4 is a schematic diagram of the embodiment of the application, which embodies the position relationship between the first coupling and the second coupling.

[0032] Figure 5 is a schematic diagram of the embodiment of the application, which embodies the position relationship between the first head and the second head.

[0033] Figure 6 is a schematic diagram of the embodiment of the application, which embodies the position relationship between the first volute and the supporting seat.

[0034] Figure 7 is a schematic diagram of the embodiment of the application, which embodies the position relationship between the second volute and the supporting seat.

[0035] Figure 8 is a cross-sectional view of the embodiment of the application, which embodies the connection relationship between the supporting seat and the adjusting seat.

[0036] Explanation of reference numerals: 1, base; 11, motor base; 12, gear box base; 13, first bearing base; 131, first bearing seat; 14, second bearing base; 141, second bearing seat; 2, motor; 3, speed-increasing gear box; 31, low-speed shaft; 311, low-speed gear; 32, first high-speed shaft; 321, first high-speed gear; 33, second high-speed shaft; 331, second high-speed gear; 4, first head; 41, first volute; 42, first impeller; 5, second head; 51, second volute; 52, second impeller; 6, electric turning gear; 7, lifting lug; 71, inlet; 72, outlet; 8, coupling protection cover; 81, first coupling; 82, second coupling; 83, third coupling; 9, support seat; 91, support rod; 92, adjusting seat; 921, adjusting hole; 93, adjusting nut. DETAILED DESCRIPTION

[0037] The following description will be made in conjunction with the accompanying drawings. Figures 1-8 The application is further described in detail.

[0038] The embodiment of the application discloses a large-flow gear speed-increasing type centrifugal compressor. Referring to Figures 1 to 7, including the base 1, the base 1 includes motor base 11, gear box base 12, the first bearing base 13 and the second bearing base 14, motor base 11, gear box base 12, the first bearing base 13 and the second bearing base 14 are independent of each other. On the one hand, it can bear load evenly, reduce vibration transmission; On the other hand, it is convenient to adjust the height, levelness and other aspects, when the compressor is installed, it is convenient to adjust according to the actual situation, so as to meet the installation requirements of the compressor. The motor 2 is installed on the motor base 11, and the gear box 3 is installed on the gear box base 12. The first bearing seat 131 is installed on the first bearing base 13, and the first bearing base 13 and the first bearing seat 131 are jointly installed on the first head 4. The second bearing seat 141 is installed on the second bearing base 14, and the second bearing base 14 and the second bearing seat 141 are jointly installed on the second head 5. The low speed shaft 31, the first high speed shaft 32 and the second high speed shaft 33 are rotatably arranged in the gear box 3, the low speed shaft 31 is connected with the output shaft of the motor 2, the first high speed shaft 32 is connected with the first head 4, and the second high speed shaft 33 is connected with the second head 5. The low speed gear 311 is installed on the low speed shaft 31, the first high speed gear 321 is installed on the first high speed shaft 32, and the second high speed gear 331 is installed on the second high speed shaft 33. The first high speed gear 321 is engaged with the low speed gear 311, and the second high speed gear 331 is engaged with the low speed gear 311. When the motor 2 drives the low speed shaft 31 to rotate, the low speed gear 311 makes the first high speed gear 321 and the second high speed gear 331 rotate at high speed. The first high speed gear 321 drives the rotor in the first head 4 to rotate at high speed through the first high speed shaft 32, and the second high speed gear 331 drives the rotor in the second head 5 to rotate at high speed through the second high speed shaft 33, so as to work on the gas in the first head 4 and the second head 5, and obtain high pressure gas equivalent to two same type compressors, improve the compression efficiency. Compared with two sets of compressors, one gear box 3 and one motor 2 are reduced, the manufacturing cost is saved, and the area occupied by the compressor is reduced. While reducing the cost of the compressor, the efficiency of the compressor is improved.

[0039] In order to improve the stability of the compressor operation, with reference to Figures 1 to 7, the electric motor 2 stops running, the driving motor 61 starts to transmit power to the first high-speed shaft 32 through the speed reducer 62, the first high-speed shaft 32 drives the low-speed gear 311 to rotate at low speed through the first high-speed gear 321, the low-speed gear 311 drives the second high-speed gear 331 to rotate at low speed, so that the first high-speed shaft 32, the second high-speed shaft 33 and the low-speed shaft 31 rotate at low speed. The situation that the first high-speed shaft 32, the second high-speed shaft 33 and the low-speed shaft 31 are stationary for a long time is reduced, so that the situation that the first high-speed shaft 32, the second high-speed shaft 33 and the low-speed shaft 31 are bent and deformed due to gravity is reduced. At the same time, the rotor in the first head 4 rotates at low speed under the drive of the first high-speed shaft 32, and the rotor in the second head 5 rotates at low speed under the drive of the second high-speed shaft 33. Before the rotor in the first head 4 and the rotor in the second head 5 rotate at high speed, on the one hand, the rotor in the first head 4 and the rotor in the second head 5 are checked for jamming phenomenon, so that the rotor in the first head 4 and the rotor in the second head 5 are fully preheated, on the other hand, the problem of large starting torque and large impact on the power grid is solved, and the reliability and safety of the compressor operation are improved.

[0040] In order to make the first head 4 and the second head 5 operate efficiently and stably, with reference to Figures 1 to 7, the first machine head 4 comprises a first volute 41 and a first impeller 42, and the second machine head 5 comprises a second volute 51 and a second impeller 52. The first impeller 42 and the second impeller 52 are both semi-open type with backward bending, high efficiency and small flow resistance loss. The first volute 41 and the second volute 51 are both split type from top to bottom, and the top of the first volute 41 and the top of the second volute 51 are both provided with lifting lugs 7. When overhauling, the upper half of the first volute 41 and the second volute 51 are lifted up through the lifting lugs 7, and then the first impeller 42 and the second impeller 52 are observed, so that the first machine head 4 and the second machine head 5 are conveniently installed and maintained. The first impeller 42 is installed in the first volute 41, the driving shaft of the first impeller 42 is rotationally connected with a first bearing seat 131, and the first volute 41 is installed on a first bearing base 13. The second impeller 52 is installed in the second volute 51, the driving shaft of the second impeller 52 is rotationally connected with a second bearing seat 141, and the second volute 51 is installed on a second bearing base 14. The first bearing seat 131 supports the first impeller 42, the second bearing seat 141 supports the second impeller 52, the first bearing base 13 supports the first volute 41, and the second bearing base 14 supports the second volute 51, so that the first machine head 4 and the second machine head 5 stably operate. The driving shaft of the first impeller 42 is in gear meshing with a first high-speed shaft 32, and the driving shaft of the second impeller 52 is in gear meshing with a second high-speed shaft 33. The gear meshing connection mode improves the stability and efficiency of power transmission, so that the first high-speed shaft 32 and the second high-speed shaft 33 bear greater torque and rotational speed, and the first machine head 4 and the second machine head 5 efficiently operate. The first volute 41 and the second volute 51 are both provided with an inlet 71 and an outlet 72. The gas enters the first volute 41 and the second volute 51 through the inlet 71, flows in the first impeller 42 and the second impeller 52, the first high-speed shaft 32 drives the first impeller 42 to rotate, and the second high-speed shaft 33 drives the second impeller 52 to rotate, so that mechanical energy is converted into pressure energy and kinetic energy of the gas, the pressure, speed and temperature of the gas are all improved, and then the gas is expanded in the first volute 41 and the second volute 51 to further improve the pressure, so that the gas is discharged from the first volute 41 and the second volute 51 at high temperature and high pressure.

[0041] Referring to Figures 1 to 7The first coupling 81 is installed between the first impeller 42 and the first high-speed shaft 32, and the first coupling 81 rotates the first impeller 42 and the first high-speed shaft 32 together and transmits torque. The second coupling 82 is installed between the second impeller 52 and the second high-speed shaft 33, and the second coupling 82 rotates the second impeller 52 and the second high-speed shaft 33 together and transmits torque. The third coupling 83 is installed between the low-speed shaft 31 and the output shaft of the motor 2, and the third coupling 83 rotates the output shaft of the motor 2 and the low-speed shaft 31 together and transmits torque. The first coupling 81, the second coupling 82, and the third coupling 83 are all diaphragm couplings, which can transmit large torque and have thermal compensation. The coupling protection cover 8 is arranged on the first coupling 81, the second coupling 82, and the third coupling 83, which reduces accidental contact of personnel with the high-speed rotating first coupling 81, the second coupling 82, and the third coupling 83.

[0042] Referring to Figures 5 to 8 The adjusting seat 92 is installed on the first bearing seat 13 and the second bearing seat 14, the adjusting hole 921 is formed in the adjusting seat 92, and the support rod 91 is inserted into the adjusting hole 921. The support rod 91 is provided with the support seat 9, one of which is used to abut against the bottom of the first volute 41, and the other of which is used to abut against the bottom of the second volute 51. The adjusting nut 93 is threadedly connected to the support rod 91 and is used to abut against the top of the adjusting seat 92. When the adjusting nut 93 is rotated, the adjusting nut 93 moves along the height direction of the support rod 91, abuts against the top of the adjusting seat 92, and adjusts the distance between the support seat 9 and the adjusting seat 92. The support seat 9 abuts against the first volute 41 and the second volute 51, thereby supporting the first volute 41 and the second volute 51 and providing an auxiliary function for the stable operation of the first head 4 and the second head 5.

[0043] The implementation principle of the large-flow gear speed-increasing type centrifugal compressor in the embodiment of the application is as follows: when the motor 2 drives the low-speed shaft 31 to rotate, the low-speed gear 311 drives the first high-speed gear 321 and the second high-speed gear 331 to rotate at high speed. The first high-speed gear 321 drives the rotor in the first head 4 to rotate at high speed through the first high-speed shaft 32, and the second high-speed gear 331 drives the rotor in the second head 5 to rotate at high speed through the second high-speed shaft 33, thereby doing work on the gas in the first head 4 and the second head 5 and obtaining high-pressure gas equivalent to two same-type compressors, improving the compression efficiency. Compared with two sets of compressors, one speed-increasing gear box 3 and one motor 2 are reduced, the manufacturing cost is saved, the land occupation of the compressor is reduced, and the compressor efficiency is improved while the cost of the compressor is reduced.

[0044] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A large flow rate centrifugal compressor of the gear-geared type, comprising a frame (1), characterized in that: The motor (2), the speed-increasing gear box (3), the first head (4) and the second head (5) are arranged on the base (1), the low-speed shaft (31), the first high-speed shaft (32) and the second high-speed shaft (33) are arranged in rotation in the speed-increasing gear box (3), the low-speed shaft (31) is connected with the output shaft of the motor (2), the first high-speed shaft (32) is connected with the first head (4), the second high-speed shaft (33) is connected with the second head (5), the low-speed gear (311) is arranged on the low-speed shaft (31), the first high-speed gear (321) is arranged on the first high-speed shaft (32), the second high-speed gear (331) is arranged on the second high-speed shaft (33), the first high-speed gear (321) and the second high-speed gear (331) are in mesh with the low-speed gear (311), the electric turning gear (6) is arranged on the speed-increasing gear box (3), and the electric turning gear (6) is connected with the first high-speed shaft (32).

2. A large flow rate gear uprated centrifugal compressor according to claim 1, characterized in that: The first head (4) comprises the first volute (41) and the first impeller (42), the first volute (41) is arranged on the base (1), the first impeller (42) is arranged in the first volute (41), the first impeller (42) is connected with the first high-speed shaft (32), the second head (5) comprises the second volute (51) and the second impeller (52), the second volute (51) is arranged on the base (1), the second impeller (52) is arranged in the second volute (51), and the second impeller (52) is connected with the second high-speed shaft (33), the first volute (41) and the second volute (51) are both provided with the inlet (71) and the outlet (72).

3. A large flow gear-up centrifugal compressor according to claim 2, characterized in that: The first volute (41) and the second volute (51) are both provided with the lifting lug (7).

4. A large flow gear-up centrifugal compressor according to claim 2, characterized in that: The first coupling (81) is arranged between the first impeller (42) and the first high-speed shaft (32), the second coupling (82) is arranged between the second impeller (52) and the second high-speed shaft (33), and the third coupling (83) is arranged between the low-speed shaft (31) and the output shaft of the motor (2), the first coupling (81), the second coupling (82) and the third coupling (83) are all diaphragm couplings.

5. A large flow gear-up centrifugal compressor according to claim 4, characterized in that: The coupling protection cover (8) is arranged on the first coupling (81), the second coupling (82) and the third coupling (83).

6. A large flow gear-up centrifugal compressor according to claim 2, characterized in that: The base (1) comprises the motor base (11), the gear box base (12), the first bearing base (13) and the second bearing base (14), the motor (2) is arranged on the motor base (11), the speed-increasing gear box (3) is arranged on the gear box base (12), the first bearing seat (131) is arranged on the first bearing base (13), the first bearing seat (131) is rotationally connected with the first impeller (42), the second bearing seat (141) is arranged on the second bearing base (14), and the second bearing seat (141) is rotationally connected with the second impeller (52).

7. A large flow gear-up centrifugal compressor according to claim 6, characterized in that: The first bearing base (13) and the second bearing base (14) are fixedly provided with adjusting seats (92), the adjusting seats (92) are provided with adjusting holes (921), the adjusting holes (921) are provided with supporting rods (91), the top of the supporting rods (91) is provided with supporting seats (9), and one of the supporting seats (9) is used for abutting against the bottom of the first volute (41), and the other supporting seat (9) is used for abutting against the bottom of the second volute (51).

8. A large flow gear-up centrifugal compressor according to claim 7, characterized in that: The supporting rods (91) are threadedly connected with adjusting nuts (93), and the bottom of the adjusting nuts (93) is used for abutting against the top of the adjusting seat (92).

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