Electric gas compression equipment

Abstract

The present application provides an electric gas compression device, having an air compressor main body device, the air compressor main body device comprising: a motor, including a stator, a rotor and a main shaft fixed to the rotor; a first-stage centrifugal air compressor, arranged on a first side of the motor axis, the first-stage centrifugal air compressor including a first-stage double-sided impeller arranged at a first end of the main shaft; a second-stage centrifugal air compressor, arranged on a second side of the motor axis, the second-stage centrifugal air compressor including a second-stage double-sided impeller arranged at a second end of the main shaft, the second-stage double-sided impeller is coaxially arranged with the first-stage double-sided impeller, and when the motor is working, the intake pressure on the front and back sides of the first-stage double-sided impeller is the same, and the intake pressure on the front and back sides of the second-stage double-sided impeller is also the same, so that the axial forces offset each other, the flow range is wide, the difficulty of bearing design is reduced, the reliability is improved, and a high-compact design of the whole machine is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of gas compression equipment, and in particular to an electric gas compression equipment. Background Art

[0002] Currently, centrifugal air compression equipment is widely used. However, in the existing technical field of electric gas compression equipment, electric gas compression equipment equipped with a single-stage centrifugal compressor has problems of low pressure and large axial force, and electric gas compression equipment equipped with a two-stage centrifugal compressor has problems of unbalanced axial force and limited flow range.

[0003] Therefore, a new electric gas compression device is urgently needed. Utility Model Content

[0004] The present application provides an electric gas compression device, having a gas compressor main device, the gas compressor main device comprising:

[0005] The motor includes a stator, a rotor and a main shaft fixed to the rotor:

[0006] The first-stage centrifugal compressor is arranged on the first side of the motor axis, and the first-stage centrifugal compressor includes a first-stage double-sided impeller arranged at the first end of the main shaft,

[0007] The second-stage centrifugal compressor is arranged on the second side of the motor axis. The second-stage centrifugal compressor includes a second-stage double-sided impeller arranged at the second end of the main shaft. The second-stage double-sided impeller is coaxially arranged with the first-stage double-sided impeller. When the motor is working, the intake pressure on the front and back sides of the first-stage double-sided impeller is the same, and the intake pressure on the front and back sides of the second-stage double-sided impeller is also the same.

[0008] The electric gas compression device provided in the present application has a first-stage centrifugal air compressor on one side of the air compressor main body device and a second-stage centrifugal air compressor on the other side. The two-stage centrifugal air compressor is set to increase the gas compression capacity.

[0009] The first-stage double-sided impeller and the second-stage double-sided impeller are connected in series with the rotor through the main shaft of the motor rotor, and the structural integration and compactness of the main device of the air compressor are improved. Because the first-stage double-sided impeller and the second-stage double-sided impeller are coaxial, the intake pressure on both sides of the double-sided impeller in each stage of the centrifugal air compressor is the same, which can achieve the self-offsetting of the axial force generated by the air compressor at each stage, and after the double-sided impellers are used at both ends, the intake volume is equivalent to twice that of ordinary centrifugal impellers of the same size, making the flow range wider. Compared with single-stage or ordinary two-stage electric compressors, not only the axial forces are offset, but also the flow range is wide, which further reduces the difficulty of bearing design, improves the reliability and life of the whole device, and also achieves high compactness of the whole machine.

[0010] In some optional embodiments,

[0011] The first-stage double-sided impeller includes a first-stage front impeller and a first-stage back impeller arranged back to back.

[0012] The first stage centrifugal compressor also includes:

[0013] The first outer shell includes a first volute and a first air intake device. The first volute and the first air intake device are connected to each other and form a first diffusion space for accommodating the first-stage double-sided impeller. The first volute is arranged corresponding to the first-stage front impeller, and the first air intake device is arranged corresponding to the first-stage back impeller.

[0014] In some optional embodiments,

[0015] The first air inlet of the first volute is connected to the first-stage front impeller and is arranged opposite to the first-stage front impeller in the axial direction. The gas to be compressed entering from the first air inlet is compressed by the first-stage front impeller.

[0016] The first air intake device is provided with a second air intake port, which is communicated with the first-stage back impeller. The gas to be compressed entering from the first air intake port is compressed by the first-stage back impeller.

[0017] In some optional embodiments,

[0018] The first outer shell is also provided with a first air outlet, which is communicated with the first pressure diffusion space, and the gas compressed by the first-stage double-sided impeller flows out of the first outer shell from the first air outlet.

[0019] In some optional embodiments,

[0020] The second-stage double-sided impeller includes a second-stage front impeller and a second-stage back impeller arranged back to back.

[0021] The second stage centrifugal compressor also includes:

[0022] The second outer shell includes a second volute and a second air intake device. The second volute and the second air intake device are interconnected to form a second diffusion space for accommodating the second-stage double-sided impeller. The second volute is arranged corresponding to the second-stage front impeller, and the second air intake device is arranged corresponding to the second-stage back impeller.

[0023] In some optional embodiments,

[0024] The third air inlet of the second volute is connected to the second-stage front impeller and is arranged opposite to the second-stage front impeller in the axial direction. The gas to be compressed entering from the third air inlet is compressed by the second-stage front impeller.

[0025] The second air intake device is provided with a fourth air intake port, which is connected to the second-stage back impeller. The gas to be compressed entering from the fourth air intake port is compressed by the second-stage back impeller.

[0026] In some optional embodiments,

[0027] The second outer shell is also provided with a second gas outlet, which is communicated with the second pressure diffusion space, and the gas compressed by the first-stage double-sided impeller flows out of the second outer shell from the second gas outlet.

[0028] In some optional embodiments,

[0029] The motor includes a cylindrical housing, a first air intake device connected to one axial end of the cylindrical housing, a second air intake device connected to the other axial end of the cylindrical housing, bearings matched with the main shaft are respectively arranged at both ends of the rotor, the bearings are located in the cylindrical housing, a thrust foil is arranged on the side of the bearing close to the first-stage centrifugal compressor facing the first-stage centrifugal compressor, a back plate is arranged between the first air intake device and the thrust foil, the back plate is used to fix the thrust foil, a central shaft hole is formed on the back plate, the main shaft passes through the central shaft hole, and a labyrinth seal is arranged between the main shaft and the central shaft hole. In some optional embodiments,

[0030] The air outlet of the first-stage centrifugal air compressor is connected to the air inlet of the second-stage centrifugal air compressor, so that the gas to be compressed is compressed in two stages in the first-stage centrifugal air compressor and the second-stage centrifugal air compressor in sequence.

[0031] In some optional embodiments,

[0032] An interstage cooler is also provided between the air outlet of the first-stage centrifugal air compressor and the air inlet of the second-stage centrifugal air compressor. The air outlet of the first-stage centrifugal air compressor is connected to the air inlet port of the interstage cooler, and the air outlet port of the interstage cooler is connected to the air inlet of the second-stage centrifugal air compressor, so that the gas compressed by the first-stage centrifugal air compressor is cooled by the interstage cooler and then enters the second-stage centrifugal air compressor for a second compression process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic cross-sectional structure diagram of a gas compressor main body device in an electric gas compression device provided in an embodiment of the present application;

[0035] Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the electric gas compression device provided in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] First stage double-sided impeller-1; first stage front impeller-11; first stage back impeller-12; first volute-2; first air inlet-21; first air inlet device-3; second air inlet-31; first air outlet-32;

[0038] Back plate-4; labyrinth seal-41; rotor-5; main shaft-51; stator-6; cylindrical housing-7; bearing-8; thrust foil-81;

[0039] Second air inlet device-9; fourth air inlet-91; second volute-10; third air inlet-101; second air outlet-102;

[0040] The second stage double-sided impeller-11; the second stage front impeller-111; the second stage back impeller-112;

[0041] First expansion space-A;

[0042] Second diffusion space-B. DETAILED DESCRIPTION

[0043] The following will be combined with the attached Figure 1 To Attachment Figure 2 The technical solution of this application is described in detail.

[0044] like Figure 1 As shown, the present application provides an electric gas compression device, having a gas compressor main body device, the gas compressor main body device includes:

[0045] The motor includes a stator 6, a rotor 5, and a main shaft 51 fixed to the rotor 5:

[0046] The first-stage centrifugal compressor is arranged on the first side of the motor axis, and the first-stage centrifugal compressor includes a first-stage double-sided impeller 1 arranged at the first end of the main shaft 51,

[0047] The second-stage centrifugal compressor is arranged on the second side of the motor axis. The second-stage centrifugal compressor includes a second-stage double-sided impeller 11 arranged at the second end of the main shaft 51. The second-stage double-sided impeller 11 is coaxially arranged with the first-stage double-sided impeller 1, and when the motor is working, the intake pressure on the front and back sides of the first-stage double-sided impeller 1 is the same, and the intake pressure on the front and back sides of the second-stage double-sided impeller 11 is also the same.

[0048] The electric gas compression device provided in the present application has a first-stage centrifugal air compressor on one side of the air compressor main body device and a second-stage centrifugal air compressor on the other side. The two-stage centrifugal air compressor is set to increase the gas compression capacity.

[0049] The first-stage double-sided impeller 1 and the second-stage double-sided impeller 11 are connected in series with the rotor 5 through the main shaft 51 of the motor rotor 5, and the structural integration and compactness of the main device of the air compressor are improved. Because the first-stage double-sided impeller 1 and the second-stage double-sided impeller 11 are coaxial, the intake pressure on both sides of the double-sided impeller in each stage of the centrifugal air compressor is the same, and the axial forces generated by the air compressor at each stage can be offset by each other. After the double-sided impellers are used at both ends, the intake volume is equivalent to twice that of ordinary centrifugal impellers of the same size, making the flow range wider. Compared with single-stage or ordinary two-stage electric compressors, not only the axial forces are offset, but also the flow range is wide, which further reduces the difficulty of the bearing 8 design, improves the reliability and life of the whole device, and also achieves high compactness of the whole machine.

[0050] In some optional embodiments,

[0051] The first-stage double-sided impeller 1 includes a first-stage front impeller 11 and a first-stage back impeller 12 arranged back to back.

[0052] The first stage centrifugal compressor also includes:

[0053] The first outer shell includes a first volute 2 and a first air intake device 3. The first volute 2 and the first air intake device 3 are interconnected to form a first diffusion space A for accommodating the first-stage double-sided impeller 1. The first volute 2 is arranged corresponding to the first-stage front impeller 11, and the first air intake device 3 is arranged corresponding to the first-stage back impeller 12.

[0054] In some optional embodiments,

[0055] The first air inlet 21 of the first volute 2 is connected to the first-stage front impeller 11 and is arranged opposite to the first-stage front impeller 11 in the axial direction. The gas to be compressed entering from the first air inlet 21 is compressed by the first-stage front impeller 11.

[0056] The first air intake device 3 is provided with a second air intake port 31 , which is connected to the first-stage back impeller 12 . The gas to be compressed entering from the first air intake port 21 is compressed by the first-stage back impeller 12 .

[0057] In these embodiments, the gas compressed by the first-stage front impeller 11 and the gas compressed by the first-stage back impeller 12 respectively decrease in velocity and increase in pressure in the first diffusion space A.

[0058] In some optional embodiments,

[0059] The first outer shell is further provided with a first gas outlet 32 ​​, which is in communication with the first pressure diffusion space A. The gas compressed by the first-stage double-sided impeller 1 flows out of the first outer shell from the first gas outlet 32 ​​.

[0060] In some optional embodiments,

[0061] The second-stage double-sided impeller 11 includes a second-stage front impeller 111 and a second-stage back impeller 112 disposed in reverse.

[0062] The second stage centrifugal compressor also includes:

[0063] The second outer shell includes a second volute 10 and a second air intake device 9. The second volute 10 and the second air intake device 9 are interconnected to form a second diffusion space B for accommodating the second-stage double-sided impeller 11. The second volute 10 is arranged corresponding to the second-stage front impeller 111, and the second air intake device 9 is arranged corresponding to the second-stage back impeller 112.

[0064] In some optional embodiments,

[0065] The third air inlet 101 of the second volute 10 is connected to the second-stage front impeller 111 and is arranged opposite to the second-stage front impeller 111 in the axial direction. The gas to be compressed entering from the third air inlet 101 is compressed by the second-stage front impeller 111.

[0066] The second air intake device 9 is provided with a fourth air intake port 91 , which is connected to the second-stage back impeller 112 . The gas to be compressed entering from the fourth air intake port 91 is compressed by the second-stage back impeller 112 .

[0067] In these embodiments, the first volute 2, the first air intake device 3 and the first-stage double-sided impeller 1 constitute a first-stage compressor with double inlets and a single outlet. The first-stage compressor inhales gas through the first air intake port 21 of the first volute 2 and the second air intake port 31 of the first air intake device 3 in a natural aspiration manner. Since the air intake pressures on the front and back sides of the first-stage double-sided impeller 1 are the same, the axial forces of the first-stage centrifugal compressor can be offset. Similarly, the second volute 10, the second air intake device 9 and the second-stage double-sided impeller 11 constitute a second-stage compressor with double inlets and a single outlet. The second-stage compressor inhales gas through the third air intake port 101 of the second volute 10 and the fourth air intake port 91 of the second air intake device 9 in a natural aspiration manner. Since the air intake pressures on the front and back sides of the second-stage double-sided impeller 11 are the same, the axial forces of the second-stage centrifugal compressor can be offset. As a result, the axial force on the main shaft 51 of the rotor 5 approaches zero, which increases the life and durability of the motor, improves the efficiency of the motor, extends the life of the main device of the air compressor, and improves reliability.

[0068] In some optional embodiments,

[0069] The second outer shell is further provided with a second gas outlet 102 , which is in communication with the second pressure diffusion space B. The gas compressed by the first-stage double-sided impeller 1 flows out of the second outer shell through the second gas outlet 102 .

[0070] In some optional embodiments,

[0071] The motor includes a cylindrical housing 7, a first air intake device 3 is connected to one axial end of the cylindrical housing 7, a second air intake device 9 is connected to the other axial end of the cylindrical housing 7, and bearings 8 are respectively provided at both ends of the rotor 5 to be assembled with the main shaft 51, and the bearings 8 are located in the cylindrical housing 7. In some optional embodiments, bearings 8 are respectively provided at both ends of the rotor 5 to be assembled with the main shaft 51, and the bearings 8 are located in the cylindrical housing 7. A thrust foil 81 is provided on the side of the bearing 8 close to the first-stage centrifugal compressor facing the first-stage centrifugal compressor, a back plate 4 is provided between the first air intake device and the thrust foil 81, and the back plate 4 is used to fix the thrust foil 81. The back plate 4 is formed with a central shaft hole, the main shaft 51 passes through the central shaft hole, and a labyrinth seal 41 is provided between the main shaft 51 and the central shaft hole.

[0072] In these embodiments, the labyrinth seal 41 is used for gas sealing to prevent the cooling gas that has been cooled and entered into the second-stage centrifugal compressor from leaking toward the end of the motor close to the first centrifugal compressor, thereby ensuring the cooling effect and the aerodynamic performance of the equipment.

[0073] In some optional embodiments, the first stage double-sided impeller and a bearing 8 are distributed on one side of the motor stator 6. The second stage double-sided impeller 11 and another bearing 8 are arranged on the other side of the motor stator 6, so as to realize two-stage sequential compression and reliable operation of the rotor 5.

[0074] The air outlet of the first-stage centrifugal air compressor is connected to the air inlet of the second-stage centrifugal air compressor, so that the gas to be compressed is compressed in two stages in the first-stage centrifugal air compressor and the second-stage centrifugal air compressor in sequence.

[0075] In some optional embodiments,

[0076] An interstage cooler is also provided between the air outlet of the first-stage centrifugal air compressor and the air inlet of the second-stage centrifugal air compressor. The air outlet of the first-stage centrifugal air compressor is connected to the air inlet port of the interstage cooler, and the air outlet port of the interstage cooler is connected to the air inlet of the second-stage centrifugal air compressor, so that the gas compressed by the first-stage centrifugal air compressor is cooled by the interstage cooler and then enters the second-stage centrifugal air compressor for a second compression process.

[0077] In these embodiments, the outlet of the first-stage centrifugal compressor is connected to the inlet port of the interstage cooler via a first external pipeline, and the outlet port of the interstage cooler is connected to the inlet port of the second-stage centrifugal compressor via a second external pipeline. Figure 2 , Figure 2The direction indicated by the thick arrow is the flow direction of the gas. The first-stage compressor inhales the gas through the first air inlet 21 of the first volute 2 and the second air inlet 31 of the first air inlet device 3 in a naturally aspirated manner, and then outputs the first-stage compressed gas to the first air outlet 32 ​​of the first outer shell after being compressed by the first-stage double-sided impeller 1 in the first-stage centrifugal air compressor. The first-stage compressed gas (which may be cooled by the interstage cooler) enters the second-stage centrifugal air compressor for a second compression process. Specifically, the first-stage compressed gas is respectively input into the third air inlet 101 of the second volute 10 and the fourth air inlet 91 of the second air inlet device 9, and after being inhaled by the second-stage centrifugal air compressor in a naturally aspirated manner, it is compressed twice through the second-stage double-sided impeller 11 to form the second-stage compressed gas, and the second-stage compressed gas is output from the second air outlet 102 of the second outer shell.

[0078] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An electrically powered gas compression device, characterized in that The invention has a main body device of an air compressor, and the main body device of the air compressor comprises: The motor includes a stator, a rotor and a main shaft fixed to the rotor: The first-stage centrifugal compressor is arranged on the first side of the motor axial direction, and the first-stage centrifugal compressor includes a first-stage double-sided impeller arranged at the first end of the main shaft, a second-stage centrifugal compressor, arranged on a second side of the motor axis, the second-stage centrifugal compressor comprising a second-stage double-sided impeller arranged at the second end of the main shaft, the second-stage double-sided impeller being coaxially arranged with the first-stage double-sided impeller, and when the motor is working, the intake pressures on the front and back sides of the first-stage double-sided impeller are the same, and the intake pressures on the front and back sides of the second-stage double-sided impeller are also the same; The gas outlet of the first-stage centrifugal air compressor is connected to the gas inlet of the second-stage centrifugal air compressor, so that the gas to be compressed is compressed in two stages in the first-stage centrifugal air compressor and the second-stage centrifugal air compressor in sequence; An interstage cooler is also provided between the air outlet of the first-stage centrifugal air compressor and the air inlet of the second-stage centrifugal air compressor. The air outlet of the first-stage centrifugal air compressor is connected to the air inlet port of the interstage cooler, and the air outlet port of the interstage cooler is connected to the air inlet of the second-stage centrifugal air compressor, so that the gas compressed by the first-stage centrifugal air compressor is cooled by the interstage cooler and then enters the second-stage centrifugal air compressor for a second compression process.

2. The electric gas compression device according to claim 1, characterized in that The first-stage double-sided impeller includes a first-stage front impeller and a first-stage back impeller arranged back to back. The first-stage centrifugal air compressor also includes: The first outer shell includes a first volute and a first air intake device, wherein the first volute and the first air intake device are interconnected and form a first diffusion space for accommodating the first-stage double-sided impeller, the first volute is arranged corresponding to the first-stage front impeller, and the first air intake device is arranged corresponding to the first-stage back impeller.

3. The electric gas compression device according to claim 2, characterized in that The first air inlet of the first volute is connected to the first-stage front impeller and is arranged opposite to the first-stage front impeller in the axial direction. The gas to be compressed entering from the first air inlet is compressed by the first-stage front impeller. The first air intake device is provided with a second air intake port, and the second air intake port is connected to the first-stage back impeller. The gas to be compressed entering from the first air intake port is compressed by the first-stage back impeller.

4. The electric gas compression device according to claim 3, characterized in that The first outer shell is also provided with a first air outlet, which is communicated with the first pressure diffusion space, and the gas compressed by the first-stage double-sided impeller flows out of the first outer shell through the first air outlet.

5. The electric gas compression device according to claim 2, characterized in that: The second-stage double-sided impeller comprises a second-stage front impeller and a second-stage back impeller arranged back to back. The second stage centrifugal air compressor also includes: The second outer shell includes a second volute and a second air intake device. The second volute and the second air intake device are interconnected to form a second diffusion space for accommodating the second-stage double-sided impeller. The second volute is arranged corresponding to the second-stage front impeller, and the second air intake device is arranged corresponding to the second-stage back impeller.

6. The electric gas compression device according to claim 5, characterized in that The third air inlet of the second volute is connected to the second-stage front impeller and is arranged opposite to the second-stage front impeller in the axial direction. The gas to be compressed entering from the third air inlet is compressed by the second-stage front impeller. The second air intake device is provided with a fourth air intake port, and the fourth air intake port is connected to the second-stage back impeller. The gas to be compressed entering from the fourth air intake port is compressed by the second-stage back impeller.

7. The electric gas compression device according to claim 6, characterized in that The second outer shell is also provided with a second gas outlet, which is communicated with the second pressure diffusion space, and the gas compressed by the first-stage double-sided impeller flows out of the second outer shell through the second gas outlet.

8. The electric gas compression device according to claim 5, characterized in that The motor comprises a cylindrical housing, the first air intake device is connected to one axial end of the cylindrical housing, and the second air intake device is connected to the other axial end of the cylindrical housing; Bearings that are assembled with the main shaft are respectively provided at both ends of the rotor, and the bearings are located in the cylindrical housing. A thrust foil is provided on the side of the bearing close to the first-stage centrifugal compressor facing the first-stage centrifugal compressor. A back plate is provided between the first air intake device and the thrust foil, and the back plate is used to fix the thrust foil. A central shaft hole is formed on the back plate, and the main shaft passes through the central shaft hole, and a labyrinth seal is provided between the main shaft and the central shaft hole.

Images