Disc-type motor, fluid machine, motor main body and rotating assembly

Abstract

The utility model belongs to the technical field of vacuum fluid machinery, and particularly relates to a disc type motor, fluid machinery, a motor main body and a rotating assembly. In order to overcome the defects of a sealing structure between a motor of a conventional fluid machine and a fluid machine main body, the utility model adopts the following technical scheme: the disc type motor comprises a motor main body which comprises a disc type stator and a sealing part, and the sealing part seals the end face, axially facing a disc type rotor, of the disc type stator; an axial air gap is formed between the disc type rotor and the disc type stator; the motor shaft is fixedly connected with the disc rotor; the controller is electrically connected with the disc type stator; wherein the disc-type rotor, the motor shaft and the motor main body are arranged in a split manner, and the motor shaft and the disc-type stator are axially staggered. Compared with a traditional radial excitation motor, the disc type motor has many advantages, the disc type rotor and the motor shaft form a rotating assembly which is arranged in a split mode with the motor body, and the disc type motor is particularly suitable for sealing connection between the motor shaft and a driven part.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid machinery, and specifically relates to a disc motor, a fluid machinery, a motor body and a rotating assembly. Background Art

[0002] Fluid machinery generally refers to fluid conveying equipment such as vacuum pumps and compressors. The fluid media conveyed by this type of equipment include liquids, gases, and plasma under vacuum conditions. This type of equipment usually drives the fluid machinery rotor through a motor and a coupling to change the volume in the fluid machinery stator, thereby conveying fluid or adjusting pressure. In order to ensure reliable operation, some fluid machinery also uses lubricating oil to lubricate the bearings. However, common contact seals are prone to sealing surface failure, resulting in medium leakage or pressure destruction. In order to solve the problem of seal failure, non-contact seals are often used.

[0003] In the field of vacuum pumps, traditional non-contact seals mainly include two solutions: sealed couplings and sealed motors (usually the fluid machinery body and motor are assembled separately and then assembled together). The first type of sealed coupling solution connects the motor shaft and the fluid machinery rotor through a magnetic coupling and a sealing sleeve. Due to the additional magnetic coupling and sealing sleeve, the cost is high and the volume is large. The second type of sealed motor solution usually sets a shielding sleeve in the traditional motor. Due to the eddy current of the magnetic field, the shielding sleeve heats up and has low energy efficiency. At the same time, the shielding sleeve is difficult to manufacture and has a high cost.

[0004] The Chinese utility model patent with the authorization announcement number CN209875465U discloses a Roots pump, which includes a vacuum pump and a motor, wherein the vacuum pump includes a vacuum pump housing and a pump rotor; the motor includes a motor housing, a motor stator and a motor rotor; the first end of the vacuum pump housing is sealed and connected to the first end of the motor housing; a rotor shaft is arranged in the pump rotor, one end of the rotor shaft extends into the motor housing and is inserted into the motor rotor; the second end of the vacuum pump housing and the second end of the motor housing are both provided with a sealing structure. In the utility model, the vacuum pump housing and the motor housing are sealed and connected to each other, replacing the existing dynamic seal between the rotor shaft and the vacuum pump housing, and becoming a static seal between the vacuum pump housing and the motor housing, thereby improving the sealing strength of the Roots pump; the vacuum pump and the motor share a rotor shaft, thereby reducing the use of couplings, improving the stability of the connection, and reducing the noise and vibration caused by the use of couplings.

[0005] However, the aforementioned Chinese utility model patent still has the following problems: 1. It does not disclose how to achieve the sealing of the motor stator. If ordinary motor glue is used, the glue casting mold will fail after multiple thermal expansions (the glue casting mold needs to be tightened in the stator hole to avoid glue residue in the stator hole), the tooling cost is high, and the manufacturing cost is increased; 2. A conventional motor with a rotor on the radial inside of the stator (radial excitation motor) is used. Compared with axial excitation motors, conventional motors have large axial dimensions, low efficiency, and low power density; 3. The coaxiality requirements of the shaft and stator are high (the radial air gap between the stator and the rotor needs to be ensured), and processing and assembly are relatively difficult; 4. Motor overload protection needs to be set separately; 5. The processing and assembly of double-end / dual-motor drives are relatively difficult. Summary of the invention

[0006] The utility model aims at the defects of the sealing structure between the motor and the main body of the existing fluid machinery, provides a disc motor, improves the sealing structure, and also provides a fluid machinery adopting the disc motor, the motor main body and the rotating assembly of the disc motor.

[0007] To achieve the above purpose, the utility model adopts the following technical solution: a disc motor, the disc motor comprises:

[0008] The motor body comprises a disc stator and a sealing component, wherein the sealing component seals the end surface of the disc stator axially toward the disc rotor;

[0009] A disc rotor with an axial air gap between it and the disc stator;

[0010] The motor shaft is fixedly connected to the disc rotor;

[0011] A controller, electrically connected to the disc stator;

[0012] The disc rotor, the motor shaft and the motor body are arranged separately, and the motor shaft and the disc stator are axially staggered.

[0013] Compared with the existing disc motor whose motor shaft passes through the disc stator, the disc motor of the utility model has a motor shaft axially staggered with the disc stator, so that the disc rotor and the motor shaft form a rotating assembly separately arranged from the motor body, and the motor body includes a disc stator and a sealing component that seals the end face of the disc stator axially toward the disc rotor; when the disc motor is applied to fluid machinery and other equipment, a static seal can be used between the motor body and the fluid machinery shell, and the motor shaft can be the same axis as the fluid machinery shaft or connected through a coupling, without considering the seal between the motor shaft and the fluid machinery shaft, thereby avoiding the dynamic seal between the rotor shaft and the fluid machinery shell, and ensuring the sealing performance; compared with the most traditional radial flux motor, the disc motor (also called axial flux motor) has many advantages over the traditional radial excitation motor, such as greater torque (in a motor of a certain volume, the axial flux permanent magnet motor can usually provide greater torque), more compact structure (the axial length is greatly reduced), lower weight, higher efficiency; and more convenient maintenance. The disc motor of the utility model separates the motor body, the disc rotor and the motor shaft. Although problems such as axial air gap still need to be solved, it has many advantages, especially when used for sealing connection between the motor shaft and the driven components.

[0014] As an improvement, the sealing component is connected to the disc stator by glue injection, the disc stator is fixed to the outer shell, and the outer shell and the sealing component are sealed. The glue injection method has low processing difficulty.

[0015] As an improvement, the sealing component is connected to the disc stator by injection molding, the sealing component forms the outer shell of the disc motor or a shell is provided outside the sealing component, and the outer shell and the sealing component are sealed. The sealing component is connected to the disc stator by injection molding, the structural strength of the injection-molded sealing component is good, and the sealing component can directly form the outer shell of the disc motor without providing a separate shell (of course, a separate shell can also be provided outside the sealing component for other considerations).

[0016] As an improvement, the sealing component seals the entire disc stator. When a housing independent of the sealing component is provided separately, the sealing component can only seal the end surface of the disc stator, thereby reducing the material usage of the sealing component and the process difficulty, and the sealing of other parts of the disc stator is achieved through the sealing between the sealing component and the housing.

[0017] As an improvement, the disc motor includes two motor bodies and two disc rotors, both of which are located at two ends of the motor shaft, and the disc stators of the two motor bodies are electrically connected to the same controller, thereby enabling two-end drive.

[0018] The fluid machinery comprises a fluid machinery body and a disc motor, wherein the fluid machinery body comprises a fluid machinery shell and a fluid machinery rotor, the disc motor is the aforementioned disc motor, and the disc motor comprises an outer shell, and the outer shell is sealed and connected to the fluid machinery shell.

[0019] The fluid machinery of the utility model adopts a disc motor and has various advantages of the disc motor; the motor body and the motor shaft of the disc motor are separately arranged and axially staggered, a static seal can be used between the motor body and the fluid machinery shell, the motor shaft can be the same axis as the fluid machinery shaft or connected through a coupling, and there is no need to consider the seal between the motor shaft and the fluid machinery shaft, thereby avoiding a dynamic seal structure at the motor shaft and ensuring the sealing performance.

[0020] As an improvement of the fluid machinery, the fluid machinery rotor includes a fluid machinery shaft, and the fluid machinery shaft simultaneously forms the motor shaft.

[0021] As another improvement of the fluid machinery, the fluid machinery shaft is connected to the motor shaft via a coupling, and in this case, the coupling does not need to be a sealed coupling.

[0022] As an improvement of the fluid machinery, the outer shell is sealed and connected to the fluid machinery shell through a sealing ring and an axial threaded connector; a radial positioning structure is formed between the fluid machinery shell and the outer shell.

[0023] The motor body is used for a disc motor, and the disc motor is the aforementioned disc motor.

[0024] A rotating assembly is used for a disc motor, wherein the disc motor is the aforementioned disc motor, and the rotating assembly comprises the disc rotor and the motor shaft, wherein the motor shaft is formed by a fluid machinery shaft of a fluid machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of the fluid machinery of the first embodiment of the utility model.

[0026] Figure 2 It is a cross-sectional view of the disc motor of the fluid machinery according to the first embodiment of the utility model.

[0027] Figure 3 It is a cross-sectional view of the fluid machinery of the second embodiment of the utility model.

[0028] Figure 4 It is a cross-sectional view of a disc motor of a fluid machinery according to the second embodiment of the utility model.

[0029] Figure 5 It is a cross-sectional view of the fluid machinery of the third embodiment of the utility model.

[0030] Figure 6It is a cross-sectional view of a fluid machine according to a fourth embodiment of the present utility model.

[0031] In the figure, 1, fluid machinery body; 11, fluid machinery shell; 12, fluid machinery rotor; 121, fluid machinery shaft; 13, bearing; 14, gear;

[0032] 2. Disc motor; 21. Motor body; 211. Disc stator; 212. Sealing component; 22. Disc rotor; 221. Mounting disc; 222. Magnetic steel; 23. Motor shaft; 24. Controller. DETAILED DESCRIPTION

[0033] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0034] Embodiment 1

[0035] See also Figure 1 and Figure 2 The fluid machinery of the first embodiment of the utility model comprises a fluid machinery body 1 and a disc motor 2. The fluid machinery body 1 comprises a fluid machinery shell 11 and a fluid machinery rotor 12. The disc motor 2 comprises:

[0036] The motor body 21 includes a disc stator 211 and a sealing component 212, wherein the sealing component 212 seals the end surface of the disc stator 211 axially toward the disc rotor 22;

[0037] The disc rotor 22 has an axial air gap with the disc stator 211;

[0038] The motor shaft 23 is fixedly connected to the disc rotor 22;

[0039] A controller 24 is electrically connected to the disc stator 211;

[0040] The disc rotor 22 and the motor shaft 23 are separately arranged from the motor body 21 , and the motor shaft 23 is axially staggered from the disc stator 211 .

[0041] In the prior art, the most commonly used dual-stator single-rotor disc motor has a motor shaft that passes through the stator and is fixed to the rotor, that is, the axial projections of the motor shaft and the disc stator 2 (projected to a plane that coincides with the axis) have an overlapping section. In this embodiment, the motor shaft 23 and the disc stator 211 are axially staggered, that is, the axial projections of the motor shaft 23, the disc rotor 22, and the disc stator 211 (projected to a plane that coincides with the axis) have no overlapping section.

[0042] In this embodiment, the sealing component 212 is connected to the disc stator 211 by injection molding, and the sealing component 212 forms the outer shell of the disc motor 2, and the outer shell is sealed with the sealing component 212. The sealing component 212 is connected to the disc stator 211 by injection molding, and the structural strength of the injection-molded sealing component 212 is good. The sealing component 212 can directly form the outer shell of the disc motor 2, so there is no need to set a separate outer shell.

[0043] In this embodiment, the sealing component 212 seals the entire disc stator 211 therein.

[0044] In this embodiment, the housing is sealed and connected to the fluid machinery housing 11 through a sealing ring and an axial threaded connector. In the figure, the sealing structure of the housing and the fluid machinery housing 11 is not shown, and reference may be made to the prior art.

[0045] In other embodiments, when a separate housing independent of the sealing component 212 is provided, the sealing component 212 may only seal the end surface of the disc stator 211, thereby reducing the material usage of the sealing component 212 and the process difficulty. The sealing of other parts of the disc stator 211 is achieved through the sealing between the sealing component 212 and the housing.

[0046] In other embodiments, the sealing component 212 is connected to the disc stator 211 by glue injection, the disc stator 211 is fixed to the outer shell, and the outer shell is sealed with the sealing component 212. The glue injection method is easy to process.

[0047] In this embodiment, a radial positioning structure is formed between the fluid machinery housing 11 and the outer shell. The radial positioning structure can be a positioning hole and a positioning pin, which are not shown in the figure and can be referred to the prior art.

[0048] In this embodiment, the fluid machinery rotor 12 includes a fluid machinery shaft 121, and the fluid machinery shaft 121 also forms the motor shaft 23. That is, the fluid machinery shaft 121 and the motor shaft 23 are the same integral shaft, or in other words, the same shaft part serves as both the fluid machinery shaft 121 and the motor shaft 23, or in other words, the fluid machinery shaft 121 extends out of the fluid machinery housing 11 to form the motor shaft 23 fixedly connected to the disc rotor 22 of the disc motor 2.

[0049] In other embodiments, the fluid machinery shaft 121 is connected to the motor shaft 23 via a coupling.

[0050] In this embodiment, the fluid machinery body 1 further includes a fluid machinery stator and two bearings 13 supporting the fluid machinery shaft 121, and the bearings 13 are arranged in the fluid machinery stator of the fluid machinery body 1. A shaft seal is arranged on the axial inner side of the bearing 13, and the shaft seal statically seals the fluid machinery shaft 121 and the fluid machinery stator (the seal here can refer to the prior art, such as a piston ring).

[0051] In this embodiment, an oil tank is formed between the fluid machinery housing 11 and the fluid machinery stator. A water cooling component is provided in the oil tank.

[0052] In this embodiment, the medium inlet and outlet channels on the stator of the fluid machinery are not shown.

[0053] In this embodiment, the fluid machinery is a single-stage rotary vane pump.

[0054] In other embodiments, the fluid machinery may also be a two-stage rotary vane pump, a multi-stage dry pump, a Roots pump, a Roots screw compound pump, etc. In this case, only corresponding changes need to be made to the pump body.

[0055] In other embodiments, the fluid machine may also be a compressor.

[0056] In this embodiment, the attached drawings are only schematic diagrams. The control principle of the disc motor can be referred to the prior art.

[0057] Compared with the motor shaft of the existing disc motor passing through the disc stator, the fluid machinery of the embodiment of the utility model has the motor shaft 23 of the disc motor 2 axially staggered with the disc stator 211, so that the disc rotor 22 and the motor shaft 23 form a rotating assembly separately arranged from the motor body 21, and the motor body 21 includes the disc stator 211 and a sealing component 212 for sealing the end face of the disc stator 211 axially toward the disc rotor 22; the motor shaft 23 and the fluid machinery shaft 121 are the same axis, and the coupling is omitted; compared with the most traditional radial flux motor, the disc motor 2 (also called axial flux The motor) has many advantages such as greater torque (in a motor of a certain volume, an axial flux permanent magnet motor can usually provide greater torque), more compact structure (the axial length is greatly reduced), lower weight, and higher efficiency; the motor body 21 can be easily separated from the fluid machinery shell 11, and maintenance is easy; compared with the radial flux motor, which requires the fluid machinery shaft and rotor to be inserted into the stator and the radial air gap between the rotor and the stator to be maintained, the disc motor of this embodiment only needs to maintain the axial air gap, and the motor body 21 is easier to disassemble and assemble; the motor will not be damaged when overloaded, and there is no need to set overload protection.

[0058] Embodiment 2

[0059] The difference between the second embodiment and the first embodiment is that disc rotors 22 are provided at both ends of the fluid machinery shaft 121 .

[0060] See also Figure 3 and Figure 4 In the fluid machinery of the second embodiment of the utility model, the disc motor 2 includes two motor bodies 21 and two disc rotors 22. The two motor bodies 21 and the two disc rotors 22 are both located at two ends of a motor shaft 23. The disc stators 211 of the two motor bodies 21 are electrically connected to the same controller 24, thereby realizing synchronous driving at both ends.

[0061] The sealing connection structure of the fluid machinery housing 11, the fluid machinery stator, etc. may refer to the prior art, such as using a sealing ring plus a threaded connection.

[0062] For other related instructions, please refer to Example 1.

[0063] Embodiment 3

[0064] See also Figure 5 The fluid machinery of the third embodiment of the present utility model is a Roots pump, which has two pump rotors 12 , and the two pump rotors 12 are meshed through a gear 14 at one end away from the disc motor 2 .

[0065] For other related instructions, please refer to Example 1.

[0066] Embodiment 4

[0067] The difference between the fourth embodiment and the third embodiment is that two disc motors 2 are provided.

[0068] See also Figure 6 The fluid machinery of the fourth embodiment of the utility model is a Roots pump. The Roots fluid machinery has two fluid machinery rotors 12. One end of the two fluid machinery rotors 12 is meshed by a gear 14. Disc rotors 22 are provided at different ends of the two fluid machinery rotors 12, and are equipped with a disc stator 211. The two disc motors 2 share a controller 24, and the two disc motors 2 are driven synchronously.

[0069] For other related instructions, please refer to Example 1.

[0070] The embodiment of the utility model also provides a disc motor 2, and the disc motor 2 is the aforementioned disc motor 2. In addition to being particularly suitable for fluid machinery, the disc motor 2 can also be used to drive other equipment.

[0071] The embodiment of the utility model also provides a motor body 21 for the disc motor 2 , and the disc motor 2 is the aforementioned disc motor 2 .

[0072] The embodiment of the utility model also provides a rotating assembly for a disc motor 2 . The disc motor 2 is the aforementioned disc motor 2 . The rotating assembly includes the disc rotor 22 and the motor shaft 23 .

[0073] The above is only a specific implementation of the invention, but the protection scope of the invention is not limited thereto. Those skilled in the art should understand that the invention includes but is not limited to the contents described in the above specific implementation. Any modification that does not deviate from the functional and structural principles of the invention will be included in the scope of the claims.

Claims

1. A disc-type motor (2), characterized in that: The disc-type motor (2) comprises: The motor body (21) comprises a disc stator (211) and a sealing component (212), wherein the sealing component (212) seals the end surface of the disc stator (211) axially toward the disc rotor (22); A disc-type rotor (22) has an axial air gap with the disc-type stator (211); A motor shaft (23) is fixedly connected to the disc rotor (22); A controller (24) electrically connected to the disc stator (211); The disc-type rotor (22), the motor shaft (23) and the motor body (21) are arranged separately, and the motor shaft (23) and the disc-type stator (211) are axially staggered.

2. The disc motor (2) according to claim 1, characterized in that: The sealing component (212) is connected to the disc-type stator (211) as a whole by means of glue injection; the disc-type stator (211) is fixedly connected to the outer shell, and the outer shell and the sealing component (212) are sealed.

3. The disc motor (2) according to claim 1, characterized in that: The sealing component (212) is integrally connected to the disc-type stator (211) by means of injection molding, the sealing component (212) forms the outer shell of the disc-type motor (2), or the sealing component (212) is provided with an outer shell, and the outer shell and the sealing component (212) are sealed.

4. The disc motor (2) according to claim 1, characterized in that: The sealing component (212) completely seals the disc-type stator (211) therein.

5. The disc motor (2) according to claim 1, characterized in that: The disc-type motor (2) comprises two motor bodies (21) and two disc-type rotors (22). The two motor bodies (21) and the two disc-type rotors (22) are both located at two ends of a motor shaft (23). The disc-type stators (211) of the two motor bodies (21) are electrically connected to the same controller (24).

6. A fluid machine, comprising a fluid machine body (1) and a disc motor (2), wherein the fluid machine body (1) comprises a fluid machine housing (11) and a fluid machine rotor (12), characterized in that: The disc motor (2) is the disc motor (2) according to any one of claims 1 to 5, and the disc motor (2) comprises a housing, and the housing is sealedly connected to the fluid machinery housing (11).

7. The fluid machine according to claim 6, characterized in that: The fluid machinery rotor (12) comprises a fluid machinery shaft (121), and the fluid machinery shaft (121) simultaneously forms the motor shaft (23), or the fluid machinery shaft (121) and the motor shaft (23) are connected via a coupling.

8. The fluid machine according to claim 6, characterized in that: The outer shell is sealedly connected to the fluid machinery shell (11) via a sealing ring and an axial threaded connection piece; a radial positioning structure is formed between the fluid machinery shell (11) and the outer shell.

9. A motor body (21), used for a disc-type motor (2), characterized in that: The disc motor (2) is the disc motor (2) according to any one of claims 1 to 5.

10. A rotating assembly for a disc motor (2), characterized in that: The disc motor (2) is the disc motor (2) according to any one of claims 1 to 5, the rotating assembly comprises the disc rotor (22) and the motor shaft (23), and the motor shaft (23) is formed by a fluid machinery shaft (121) of a fluid machinery.

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