A multi-stage disc compressor

Abstract

A multi-stage disc compressor includes N disc compressors connected in series, wherein N is greater than or equal to 2; among the N disc compressors connected in series, the air outlet of the preceding disc compressor is connected to the air inlet of the following disc compressor; the N disc compressors connected in series have the same structure, and the disc compressor includes a disc booster structure, a motor, a bearing, and a stator; the rotating shaft is driven to rotate by the motor and supported in the stator by bearings. The multi-stage disc compressor of the present invention can solve the problems of limited pressure ratio, high sealing requirements, high noise, poor stability, complex structure, and high cost of existing compressors.

Description

Technical Field

[0001] The invention belongs to the technical field of air compressors, and in particular relates to a multi-stage disc type air compressor. Background Art

[0002] A compressor is a component that uses high-speed rotating blades to do work on gas (mostly air) to increase the gas pressure.

[0003] The existing compressor generally has a bladed turbine mounted on the rotating shaft, which pressurizes the gas through vortex flow and then throws it out. The existing technology has the following problems: high sealing requirements at all parts of the device, high noise; the structure and process flow of the bladed turbine are complex, the cost is high, and the mass distribution is uneven, and the stability is poor when rotating at high speed.

[0004] Small-volume conventional compressors often have difficulty obtaining a large pressure ratio due to limitations in flow and turbine size. Therefore, for applications with high integration requirements or small volumes, conventional compressors have difficulty providing high-pressure gas. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and provide a multi-stage disc compressor, which can solve the problems of limited pressure ratio, high sealing requirements, high noise, poor stability, complex structure and high cost of the existing compressor.

[0006] The technical solution of the present invention is:

[0007] A multi-stage disc compressor comprises N disc compressors connected in series, wherein N≥2; among the N disc compressors connected in series, the air outlet of the preceding disc compressor is connected to the air inlet of the succeeding disc compressor; the N disc compressors connected in series have the same structure, wherein the disc compressor comprises a disc boosting structure, a motor, a bearing, and a stator; the rotating shaft is driven to rotate by the motor and is supported in the stator by bearings.

[0008] Furthermore, except for the first disc compressor, among the N disc compressors connected in series, the other disc compressors are all covered with a third shell on the outside, and the third shell is provided with an air inlet and a shell air outlet corresponding to the air outlet of the disc compressor.

[0009] Furthermore, the disc-type supercharging structure includes a rotating shaft, at least one rotating disk, a first shell and a second shell; the at least one rotating disk is fixedly mounted on the rotating shaft or is integrally formed with the rotating shaft; the first shell is a cylindrical structure and is covered outside the at least one rotating disk, and there is a first gap between the rotating disk surface adjacent to the first shell and the end surface of the first shell, and between the outer periphery of the rotating disk and the side wall of the first shell; the second shell is a cylindrical structure and is mounted on the rotating shaft and fixedly connected to the first shell; the gap between the rotating shaft and the inner wall of the second shell constitutes an air inlet duct; the first gap is connected to the air inlet duct, and an air outlet is opened on the side wall of the first shell.

[0010] Furthermore, when there are multiple turntables, a gap is provided between every two adjacent turntables.

[0011] Furthermore,

[0012] When the number of the plurality of rotating disks is an odd number, at least one air hole is provided on the rotating disks except the rotating disk located in the middle position;

[0013] When the number of the plurality of rotating disks is an even number, at least one air hole is arranged on the other rotating disks except the two rotating disks located in the middle.

[0014] Furthermore, there are a plurality of air holes, and the plurality of air holes are evenly distributed on the turntable relative to the axis of the turntable.

[0015] Furthermore, gaskets are arranged between the plurality of rotating disks.

[0016] Furthermore, spiral air grooves are arranged on both surfaces of the turntable.

[0017] Furthermore, convergent sections are provided at the entrances of both end surfaces of the second shell, and the entrances converge in a trumpet shape from outside to inside.

[0018] Furthermore, the bearing is a contact bearing or a non-contact bearing.

[0019] The advantages of the present invention compared with the prior art are:

[0020] 1. The multi-stage disc compressor of the present invention can solve the problems of limited pressure ratio, high sealing requirements, high noise, poor stability, complex structure and high cost of existing compressors.

[0021] 2. The multi-stage disc compressor of the present invention has high compression efficiency when used in a compressor, and the air flow rate is between that of a piston compressor and a centrifugal compressor.

[0022] 3. Compared with conventional compressors of the same volume, the multi-stage disc compressor of the present invention has a higher single-stage pressure ratio, which can reach 4-18.

[0023] 4. The multi-stage disc compressor of the present invention has a circular disc as the rotating disc, and has no structures such as blades, so that the mass distribution is relatively uniform and the stability is better when the rotating shaft rotates at a high speed.

[0024] 5. The multi-stage disc compressor of the present invention can take in air at both ends, has a large air intake volume, a simple rotating disc structure, and uniform mass distribution, so it has good stability during rotation and low noise.

[0025] 6. In the multi-stage disc compressor of the present invention, when the number of turntables is an odd number, the middle turntable is not provided with air holes; when the number of turntables is an even number, the two middle turntables are not provided with air holes, thereby avoiding the problem of uneven force on the middle turntable caused by airflow collision and airflow turbulence at both ends.

[0026] 7. The multi-stage disc compressor of the present invention has spiral air grooves on both sides of the rotating disc, which can realize the rapid flow of air in the bearing, conduct the compressor gas, and prevent air blockage and accumulation.

[0027] 8. The multi-stage disc compressor of the present invention is provided with convergent sections at the inlets of both end surfaces of the second shell to ensure smooth intake of air. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a multi-stage disc compressor of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a disc-type supercharging structure in a multi-stage disc-type compressor of the present invention;

[0030] Figure 3 It is a structural schematic diagram of a disc-type supercharging structure containing multiple rotating discs in a multi-stage disc-type compressor of the present invention;

[0031] Figure 4 It is a schematic diagram of the disk structure of the rotating disk in the multi-stage disk compressor of the present invention;

[0032] Figure 5 It is a schematic structural diagram of the first compressor in the multi-stage disc compressor of the present invention.

[0033] Reference numerals:

[0034] 1: rotating shaft; 2: rotating disk; 201: air hole; 202: air slot; 4: first shell; 401: air outlet; 5: second shell; 6: gasket; 7: motor; 8: bearing; 9: stator; 10: diffuser; 11: third shell; 111: air inlet; S1: first gap; S2: air inlet duct. DETAILED DESCRIPTION

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] A multi-stage disc compressor comprises N disc compressors connected in series, wherein N≥2; among the N disc compressors connected in series, the air outlet 401 of the preceding disc compressor is connected to the air inlet 111 of the succeeding disc compressor; the N disc compressors connected in series have the same structure, and the disc compressor comprises the above-mentioned disc boosting structure, a motor 7, a bearing 8 and a stator 9; the rotating shaft 1 is driven to rotate by the motor 7 and is supported in the stator 9 by the bearing 8.

[0038] Preferably, the drive shaft of the motor 7 and the rotating shaft 1 are an integral shaft; or, the drive shaft of the motor 7 is fixedly connected to the rotating shaft 1; or, the drive shaft of the motor 7 is connected to the rotating shaft 1 via a coupling.

[0039] Preferably, except for the first disc compressor, among the N disc compressors connected in series, the other disc compressors are all covered with a third shell 11 on the outside, and the third shell is provided with an air inlet 111 and a shell air outlet corresponding to the air outlet 401 of the disc compressor. The shell air outlet is the same as the air outlet 401 of the disc compressor.

[0040] Preferably, the air outlet 401 of the front disc compressor is connected to the air inlet 111 of the rear disc compressor through a pipeline.

[0041] Preferably, the disc-type boosting structure comprises a rotating shaft 1, at least one rotating disk 2, a first shell 4 and a second shell 5; the at least one rotating disk 2 is fixedly sleeved on the rotating shaft 1; preferably, the at least one rotating disk 2 is fixed to the rotating shaft 1 as a whole or is integrally formed.

[0042] The first housing 4 is a cylindrical structure, and the first housing 4 is disposed outside the at least one turntable 2. Specifically, when there is a single turntable 2, a first gap S1 exists between the two disk surfaces and the outer periphery of the turntable 2 and the end surface and inner wall of the first housing 4; when there are two or more turntables 2, a first gap S1 exists between the disk surface of the turntable adjacent to the first housing and the end surface of the first housing, and between the outer periphery of the turntable and the side wall of the first housing.

[0043] The second shell 5 is a cylindrical structure and is sleeved on the rotating shaft 1 and fixedly connected to the first shell 4; the gap between the rotating shaft 1 and the inner wall of the second shell 5 constitutes an air inlet S2; the first gap is connected to the air inlet, and an air outlet 401 is opened on the side wall of the first shell 4.

[0044] When the disc-type supercharging structure is working, the first shell 4 and the second shell 5 remain in a fixed state.

[0045] Preferably, when there are multiple turntables 2, a gap is provided between every two adjacent turntables 2. By increasing the number of the turntables, the air intake volume of the disc-type supercharging structure can be effectively increased.

[0046] Further preferably, when the number of the plurality of the rotating disks 2 is an odd number, at least one air hole 201 is provided on the rotating disks 2 except the rotating disk 2 located in the middle; when the number of the plurality of the rotating disks 2 is an even number, at least one air hole 201 is provided on the rotating disks 2 except the two rotating disks 2 located in the middle, that is, when the number of the rotating disks 2 is an odd number, the rotating disk 2 located in the middle is not provided with an air hole 201; when the number of the rotating disks 2 is an even number, the two rotating disks 2 located in the middle are not provided with an air hole 201. Because the boost structure of the present invention is air intake on both sides, if the rotating disk 2 in the middle is provided with an air hole 201, there may be problems such as airflow collision at both ends and airflow turbulence, resulting in uneven force on the rotating disk in the middle.

[0047] Preferably, there are a plurality of air holes 201 , and the plurality of air holes 201 are evenly distributed on the turntable 2 relative to the axis of the turntable.

[0048] Preferably, a gasket 6 is provided between the plurality of the turntables 2 , and the gasket 6 is used to adjust the gap size between two adjacent turntables 2 .

[0049] Preferably, the turntable 2 is made of carbon fiber material or high temperature resistant epoxy resin.

[0050] Preferably, the connection between the turntable 2 and the rotating shaft 1 is a smooth transition of an arc surface to reduce stress concentration, while making the air intake smoother and reducing flow losses at right angles.

[0051] Preferably, spiral air grooves 202 are provided on both surfaces of the turntable 2. The spiral air grooves can realize rapid flow of air in the bearing, which can not only conduct compressor gas but also prevent air blockage and accumulation.

[0052] Further preferably, the air groove 202 can be formed by forging, rolling, etching or stamping.

[0053] Preferably, convergent sections are provided at the inlets of both end surfaces of the second shell 5, so that air intake is smoother.

[0054] The disc-type supercharging structure of the present invention works on the basis of the boundary layer effect of air. Due to the viscous force between the fluid molecules and the turntable and the traction force between the fluid molecules, when the turntable rotates, the fluid molecules on the turntable surface are accelerated and move in a spiral shape from the middle of the turntable to the edge of the turntable, and finally leave the turntable surface at high speed. The turntable has uniform quality, more stable operation, less friction and less noise. In addition, since the turntable can be very thin and closely arranged, the supercharging is higher and the air flow is larger.

[0055] When the disc-type supercharging structure of the present invention is working, if there is only one turntable 2, the gas flows into the air inlet S2 from the inlet of the second shell 5, and is thrown to the air outlet 401 from the first gap S1, which can provide high-pressure gas for subsequent devices. When there are multiple turntables 2, the first part of the gas at both ends flows into the first gap S1 from the air inlet S2 and is thrown to the air outlet 401, and the second part flows through the air hole 201 to the gap between the outer turntable 2 and the next turntable 2; the second part of the gas is further divided into two paths, one part is thrown out from the gap between the outer turntable 2 and the next turntable 2, and the other part flows from the air hole 201 to the turntable 2 closer to the center... until it flows to the center turntable 2.

[0056] Preferably, the air outlet 401 of the disc compressor is connected to the diffuser 10 .

[0057] Preferably, the bearing 8 is a contact bearing, such as a ball bearing, or a non-contact bearing, such as an air bearing.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-stage disc compressor, characterized in that: It comprises N disc compressors connected in series, wherein N≥2; among the N disc compressors connected in series, an air outlet of a preceding disc compressor is connected to an air inlet of a succeeding disc compressor; The N disc compressors connected in series have the same structure, and the disc compressor comprises a disc booster structure, a motor, a bearing, and a stator; the rotating shaft is driven to rotate by the motor and supported in the stator through the bearing; Except for the first disc compressor, among the N disc compressors connected in series, the other disc compressors are all covered with a third shell on the outside, and the third shell is provided with an air inlet and a shell air outlet corresponding to the air outlet of the disc compressor; The disc-type supercharging structure comprises a rotating shaft, at least one rotating disc, a first shell and a second shell; the at least one rotating disc is fixedly sleeved on the rotating shaft or is integrally formed with the rotating shaft; The first shell is a cylindrical structure and is disposed outside the at least one rotating disk, and a first gap exists between the rotating disk surface adjacent to the first shell and the end surface of the first shell, and between the outer periphery of the rotating disk and the side wall of the first shell; The second shell is a cylindrical structure and is sleeved on the rotating shaft and fixedly connected to the first shell; the gap between the rotating shaft and the inner wall of the second shell constitutes an air inlet; The first gap is in communication with the air inlet, and the first shell side wall is provided with an air outlet; When there are multiple rotating disks, a gap is provided between every two adjacent rotating disks; When the number of the plurality of rotating disks is an odd number, at least one air hole is provided on the rotating disks except the rotating disk located in the middle position; When the number of the plurality of rotating disks is an even number, at least one air hole is provided on the rotating disks except the two rotating disks located in the middle; There are a plurality of air holes, and the plurality of air holes are evenly distributed on the turntable relative to the axis of the turntable; Gaskets are arranged between the plurality of rotating disks; The two surfaces of the turntable are provided with spiral air grooves; The inlets of both end surfaces of the second shell are provided with convergent sections, where the inlets converge from outside to inside in a trumpet shape; The bearing is a contact bearing or a non-contact bearing.

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