Connecting structure of rotor and motor of screw vacuum pump
By employing a truncated cone structure with tapered fit and limiting components in the connection structure between the screw vacuum pump rotor and the motor, the problems of connection stability and motor stress were solved, resulting in more stable transmission and extended equipment life.
Patent Information
- Application Number
- CN202520202929.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-10
AI Technical Summary
In existing screw vacuum pumps, the connection stability and the stress on the motor rotor are not fully considered when the rotor and motor rotor are fitted together on a conical surface, which affects the stability and reliability of the transmission.
The screw vacuum pump rotor with a frustum structure has a taper of 5-8 degrees with the connecting sleeve. It is connected by a tapered surface and bolts and washers. Combined with a limiting component, it ensures the stability and limiting of the motor rotor. The outer surface of the extension can be coated with a carburized layer to improve wear resistance.
It improves the connection stability between the screw vacuum pump rotor and the motor, reduces the risk of wear and deformation, enhances the ability to withstand axial and radial forces, and ensures the stability and reliability of the transmission.
Smart Images
Figure CN223707912U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of screw vacuum pump technology, and in particular to a connection structure between a screw vacuum pump rotor and a motor. Background Technology
[0002] A screw vacuum pump is a device that transports gas by changing the volume between meshing screws. As the rotor of the screw vacuum pump rotates, a sealed cavity is continuously formed at one end and disappears at the other end, allowing gas to be continuously drawn in from one end and expelled from the other without pulsation, thus achieving the function of evacuation.
[0003] To facilitate processing and assembly, existing screw vacuum pump rotors and motor rotors require a conical fit in some scenarios. However, current screw vacuum pump rotors and motor rotors do not fully consider connection stability and the stress on the motor rotor when using a conical fit, which affects the stability and reliability of the transmission. Utility Model Content
[0004] To address the shortcomings or problems existing in the prior art, this disclosure provides a connection structure between the rotor of a screw vacuum pump and the motor, which makes the cooperation between the rotor of the screw vacuum pump and the motor more stable.
[0005] The technical solution adopted by this disclosure to solve the above-mentioned technical problem is as follows: a connection structure between a screw vacuum pump rotor and a motor, including a motor assembly and a screw vacuum pump rotor. The motor assembly includes a motor rotor and a connecting sleeve. The motor rotor is sleeved on the outside of the connecting sleeve. The connecting sleeve has a connecting hole along its axial direction. The screw vacuum pump rotor is provided with an extension. The extension is a frustum structure with a taper of 5-8 degrees. The connecting hole is provided with a tapered surface. The extension is at least partially located in the connecting hole and fits against the tapered surface. The screw vacuum pump rotor and the connecting sleeve are connected by a connecting assembly.
[0006] In a preferred embodiment, the taper of the frustum structure is 5.7 degrees.
[0007] In a preferred embodiment, the connecting hole includes a first mounting hole and a second mounting hole that are interconnected. The tapered surface is disposed in the first mounting hole. The end of the first mounting hole that is away from the second mounting hole is the first end, and the end of the first mounting hole that is close to the second mounting hole is the second end. The inner diameter of the first mounting hole gradually decreases from the first end to the second end.
[0008] In a preferred embodiment, a first stepped surface is provided at the transition point between the second mounting hole and the first mounting hole. The second mounting hole is a cylindrical hole, and the inner diameter of the second mounting hole is larger than the inner diameter of the second end of the first mounting hole.
[0009] As a preferred embodiment, the connecting assembly comprises a bolt and at least one gasket, the extension is provided with a blind hole in the axial direction thereof, the blind hole is provided with an internal thread, the tail of the bolt is screwed with the internal thread, the head of the bolt and the gasket are both located in the second mounting hole, the gasket is located between the extension and the head of the bolt, and the gasket abuts against the first step surface.
[0010] As a preferred embodiment, the connecting sleeve comprises a first section and a second section, the second section is provided with a second step surface at the transition to the first section, the outer diameter of the first section is larger than that of the second section, the motor rotor is sleeved outside the second section, and the first end of the motor rotor abuts against the second step surface.
[0011] As a preferred embodiment, the motor rotor is connected with a limiting assembly, the limiting assembly comprises a first pressing sheet and a plurality of first connecting pieces, the end surface of the second section of the connecting sleeve is flush with the end surface of the second end of the motor rotor, the first pressing sheet is respectively attached to the end surface of the second section of the connecting sleeve and the end surface of the second end of the motor rotor, and the first connecting pieces are used to connect the first pressing sheet with the connecting sleeve.
[0012] As a preferred embodiment, the limiting assembly further comprises a second pressing sheet and a plurality of second connecting pieces, the second pressing sheet is attached to the end surface of the first end of the motor rotor, and the second connecting pieces respectively pass through the first pressing sheet, the motor rotor and the second pressing sheet, and the second connecting pieces are used to connect the first pressing sheet and the second pressing sheet with the motor rotor respectively.
[0013] As a preferred embodiment, the second connecting pieces are respectively provided with a first limiting groove and a second limiting groove in the length direction thereof, the first limiting groove is provided with a first limiting sleeve, the second limiting groove is provided with a second limiting sleeve, the first limiting sleeve is arranged outside the first pressing sheet and used to axially limit the first pressing sheet, and the second limiting sleeve is arranged outside the second pressing sheet and used to axially limit the second pressing sheet.
[0014] As a preferred embodiment, the outer surface and / or the conical surface of the extension are provided with a carburized layer.
[0015] Compared with the prior art, the conical degree of the circular truncated cone structure is set to 5-8 degrees in the application, so that the circular truncated cone structure has sufficient effective contact area when cooperating with the conical surface, thereby improving the stability of the connection; such setting also reduces the axial component force, avoids the risk of wear and deformation of the connecting sleeve and the motor rotor after long-time operation; in addition, the motor rotor can also withstand greater axial and radial forces due to this conical degree setting. BRIEF DESCRIPTION OF DRAWINGS
[0016] The present application will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only for the purpose of explaining the preferred embodiments and thus should not be taken as limiting the scope of the present application. In addition, the drawings only schematically represent the composition or structure of the described objects and can contain exaggerated displays, unless specifically indicated, and the drawings are not necessarily drawn to scale.
[0017] Figure 1 is a sectional view of a connecting structure of a screw vacuum pump rotor and a motor according to the present disclosure;
[0018] Figure 2 is a sectional view of a connecting structure of a screw vacuum pump rotor and a motor according to the present disclosure; Figure 1 is a partial enlarged view of A in the present disclosure;
[0019] Figure 3 is a sectional view of a connecting structure of a screw vacuum pump rotor and a motor according to the present disclosure;
[0020] Figure 4 is a sectional view of a connecting structure of a screw vacuum pump rotor and a motor according to the present disclosure;
[0021] Figure 5 is a sectional view of a connecting structure of a screw vacuum pump rotor and a motor according to the present disclosure;
[0022] Figure 6 is a sectional view of a connecting structure of a screw vacuum pump rotor and a motor according to the present disclosure;
[0023] Figure 7 is a sectional view of a connecting structure of a screw vacuum pump rotor and a motor according to the present disclosure;
[0024] Figure 8 is a sectional view of a connecting structure of a screw vacuum pump rotor and a motor according to the present disclosure;
[0025] Explanation of reference signs:
[0026] 1, screw vacuum pump rotor; 2, motor rotor; 3, connecting sleeve; 4, extension; 5, first mounting hole; 6, second mounting hole; 7, first stepped surface; 8, second stepped surface; 9, first connecting piece; 10, second connecting piece; 11, first pressing piece; 12, second pressing piece; 13, gasket; 14, first limiting sleeve; 16, second limiting sleeve; 17, blind hole; 18, first limiting groove; 19, second limiting groove. DETAILED DESCRIPTION
[0027] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail, clearly and completely below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and do not limit the present disclosure.
[0028] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.
[0029] Please refer to Figure 1 , Figure 2 and Figure 5 , the application provides a screw vacuum pump rotor and motor connecting structure, including motor assembly and screw vacuum pump rotor 1, motor assembly includes motor rotor 2 and connecting sleeve 3, motor rotor 2 is set in the outside of connecting sleeve 3, connecting sleeve 3 is provided with connecting hole along its axial direction, screw vacuum pump rotor 1 is provided with extension 4, extension 4 is circular truncated cone structure, the taper of circular truncated cone structure is 5-8 degrees, preferably, the taper of circular truncated cone structure is 5.7 degrees, connecting hole is provided with tapered surface, extension 4 is at least partially located in connecting hole and is attached to tapered surface, screw vacuum pump rotor 1 and connecting sleeve 3 are connected through connecting assembly.The application connects connecting sleeve 3 and screw vacuum pump rotor 1 through tapered surface cooperation, which is more convenient to install.By setting the taper of circular truncated cone structure to 5-8 degrees, when circular truncated cone structure cooperates with tapered surface, it has sufficient effective contact area, thereby improving the stability of connection;Such setting also reduces the axial component force, avoids the risk of wear and deformation of connecting sleeve 3 and motor rotor 2 after long-time operation;In addition, this taper setting makes motor rotor 2 can also withstand greater axial and radial force.
[0030] Please refer to Figure 7As shown, specifically, the connecting hole includes a first mounting hole 5 and a second mounting hole 6 which are in communication with each other, the tapered surface is arranged in the first mounting hole 5, one end of the first mounting hole 5 away from the second mounting hole 6 is a first end, one end of the first mounting hole 5 close to the second mounting hole 6 is a second end, and the inner diameter of the first mounting hole 5 gradually decreases from the first end to the second end. Since the taper of the extension part 4 is 5-8 degrees, the wall thickness of the connecting sleeve 3 at the first end of the first mounting hole 5 is moderate, and the connecting sleeve 3 has sufficient effective contact area with the screw vacuum pump rotor 1, thereby having strong connection stability. If the taper of the extension part 4 is too large, the wall thickness of the connecting sleeve 3 at the first end of the first mounting hole 5 is thin, which will affect the stability of the connection between the connecting sleeve 3 and the screw vacuum pump rotor 1. In addition, when the taper of the extension part 4 is too large, the friction between the connecting sleeve 3 and the screw vacuum pump rotor 1 will decrease, which may cause the connection between the two to slip, affecting the stability and reliability of the transmission. If the taper of the extension part 4 is too large, the axial component force generated after the connecting sleeve 3 is connected with the screw vacuum pump rotor 1 is large, which may cause the connecting sleeve 3 and the motor rotor 2 to deform after a long time of operation, affecting the performance and service life of the pump.
[0031] Please refer to Figure 2 、 Figure 6 and Figure 7 As shown in an embodiment of the present disclosure, a first step surface 7 is arranged at the transition of the second mounting hole 6 to the first mounting hole 5, the second mounting hole 6 is a cylindrical hole, and the inner diameter of the second mounting hole 6 is larger than the inner diameter of the second end of the first mounting hole 5. The connecting assembly includes a bolt and at least one gasket 13, the extension part 4 is provided with a blind hole 17 in the axial direction thereof, the blind hole 17 is provided with an internal thread, the tail of the bolt is screwed with the internal thread, the head of the bolt and the gasket 13 are both located in the second mounting hole 6, the gasket 13 is located between the extension part 4 and the head of the bolt, and the gasket 13 abuts against the first step surface 7. The first step surface 7 is used for axially limiting the gasket 13, when the connecting sleeve 3 is connected with the screw vacuum pump rotor 1, the bolt can be screwed together with the extension part 4 by clockwise or counterclockwise rotation, and the arrangement of the first step surface 7 makes the connection between the connecting sleeve 3 and the screw vacuum pump rotor 1 more convenient. In addition, after the connecting sleeve 3 is connected with the screw vacuum pump rotor 1, the head of the bolt is located in the second mounting hole 6, avoiding the head of the bolt exposed outside the connecting sleeve 3 to occupy extra space.
[0032] Please refer to Figure 3 and Figure 4 It should be noted that the connecting sleeve 3 includes a first section and a second section, the second section is provided with a second step surface 8 at the transition to the first section, the outer diameter of the first section is larger than that of the second section, the motor rotor 2 is sleeved outside the second section, and the first end of the motor rotor 2 abuts against the second step surface 8.
[0033] Please refer to Figure 3 ,Figure 4 and Figure 8 As shown in the figure, in order to limit the axial movement of the motor rotor 2, the motor rotor 2 is connected with a limiting assembly, the limiting assembly includes a first pressing sheet 11 and a plurality of first connecting pieces 9, the end face of the second segment of the connecting sleeve 3 is flush with the end face of the second end of the motor rotor 2, the first pressing sheet 11 is respectively attached to the end face of the second segment of the connecting sleeve 3 and the end face of the second end of the motor rotor 2, and the first connecting piece 9 is used to connect the first pressing sheet 11 and the connecting sleeve 3. In this way, the motor rotor 2 can be limited between the first pressing sheet 11 and the second step surface 8, so as to avoid the axial movement of the motor rotor 2. Preferably, the first connecting piece 9 is a bolt.
[0034] In order to further limit the axial movement of the motor rotor 2, the limiting assembly further includes a second pressing sheet 12 and a plurality of second connecting pieces 10, the second connecting piece 10 is a rod structure, the second pressing sheet 12 is attached to the end face of the first end of the motor rotor 2, the second connecting piece 10 respectively passes through the first pressing sheet 11, the motor rotor 2 and the second pressing sheet 12, and the second connecting piece 10 is used to connect the first pressing sheet 11 and the second pressing sheet 12 with the motor rotor 2 respectively. The second connecting piece 10 is respectively provided with a first limiting groove 18 and a second limiting groove 19 along the length direction thereof, the first limiting groove 18 is provided with a first limiting sleeve 14, the second limiting groove 19 is provided with a second limiting sleeve 16, the first limiting sleeve 14 is arranged outside the first pressing sheet 11 and is used to limit the axial movement of the first pressing sheet 11, and the second limiting sleeve 16 is arranged outside the second pressing sheet 12 and is used to limit the axial movement of the second pressing sheet 12. In this way, the end face of the first end of the motor rotor 2 is attached to the second pressing sheet 12, the end face of the second end of the motor rotor 2 is attached to the first pressing sheet 11, and the first pressing sheet 11 and the second pressing sheet 12 are located between the first limiting sleeve 14 and the second limiting sleeve 16, so as to effectively avoid the axial movement of the motor rotor 2.
[0035] In particular, the outer surface and / or the tapered surface of the extension part 4 is provided with a carburized layer. The outer surface and / or the tapered surface of the extension part 4 is provided with a carburized layer by using a surface treatment technology of carburizing and quenching, so as to improve the hardness and wear resistance of the extension part 4 and the connecting sleeve 3, and further prolong the service life.
[0036] In addition, in order to improve the friction force at the connection between the extension part 4 and the connecting sleeve 3, the outer surface and / or the tapered surface of the extension part 4 can also be provided with a spline.
[0037] The above has carried on the detailed introduction to the present application, the principle and the implementation mode of the present application are set forth by applying the specific examples in this paper, the above example is only used for helping understanding the present application and the core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, the present application can be improved and modified, these improvements and modifications also fall within the protection scope of the present application.
Claims
1. A connection structure between the rotor of a screw vacuum pump and a motor, characterized in that, The application relates to a screw vacuum pump rotor (1) and a motor assembly, wherein the motor assembly comprises a motor rotor (2) and a connecting sleeve (3), the motor rotor (2) is sleeved outside the connecting sleeve (3), the connecting sleeve (3) is provided with a connecting hole in the axial direction of the connecting sleeve (3), the screw vacuum pump rotor (1) is provided with an extension part (4), the extension part (4) is in a circular truncated cone structure, the taper of the circular truncated cone structure is 5-8 degrees, the connecting hole is provided with a tapered surface, the extension part (4) is at least partially located in the connecting hole and is attached to the tapered surface, and the screw vacuum pump rotor (1) is connected with the connecting sleeve (3) through a connecting assembly.
2. The connection structure of a screw vacuum pump rotor and a motor according to claim 1, characterized in that, The taper of the circular truncated cone structure is 5.7 degrees.
3. The connection structure of a screw vacuum pump rotor and a motor according to claim 1, characterized in that, The connecting hole comprises a first mounting hole (5) and a second mounting hole (6) which are communicated with each other, the tapered surface is arranged in the first mounting hole (5), one end of the first mounting hole (5) away from the second mounting hole (6) is a first end, one end of the first mounting hole (5) close to the second mounting hole (6) is a second end, and the inner diameter of the first mounting hole (5) gradually decreases from the first end to the second end.
4. The connection structure of a screw vacuum pump rotor and a motor according to claim 3, characterized in that, The second mounting hole (6) is provided with a first step surface (7) at the transition to the first mounting hole (5), the second mounting hole (6) is a cylindrical hole, and the inner diameter of the second mounting hole (6) is larger than the inner diameter of the second end of the first mounting hole (5).
5. The connection structure of a screw vacuum pump rotor and a motor according to claim 4, characterized in that, The connecting assembly comprises a bolt and at least one gasket (13), the extension part (4) is provided with a blind hole (17) in the axial direction of the extension part (4), the blind hole (17) is provided with an internal thread, the tail of the bolt is screwed with the internal thread, the head of the bolt and the gasket (13) are located in the second mounting hole (6), the gasket (13) is located between the extension part (4) and the head of the bolt, and the gasket (13) is in abutment with the first step surface (7).
6. The connection structure of a screw vacuum pump rotor and a motor according to claim 1, characterized in that, The connecting sleeve (3) comprises a first section and a second section, the second section is provided with a second step surface (8) at the transition to the first section, the outer diameter of the first section is larger than the outer diameter of the second section, the motor rotor (2) is sleeved outside the second section, and the first end of the motor rotor (2) is in abutment with the second step surface (8).
7. The connection structure of a screw vacuum pump rotor and a motor according to claim 6, characterized in that, The motor rotor (2) is connected with a limiting assembly, the limiting assembly comprises a first pressing piece (11) and a plurality of first connecting pieces (9), the end face of the second section of the connecting sleeve (3) is flush with the end face of the second end of the motor rotor (2), the first pressing piece (11) is attached to the end face of the second section of the connecting sleeve (3) and the end face of the second end of the motor rotor (2) respectively, and the first connecting piece (9) is used for connecting the first pressing piece (11) with the connecting sleeve (3).
8. The connection structure of a screw vacuum pump rotor and a motor according to claim 7, characterized in that, The limiting assembly further comprises a second pressing piece (12) and a plurality of second connecting pieces (10), the second pressing piece (12) is attached to the end face of the first end of the motor rotor (2), and the second connecting piece (10) passes through the first pressing piece (11), the motor rotor (2) and the second pressing piece (12) respectively, and the second connecting piece (10) is used for connecting the first pressing piece (11) and the second pressing piece (12) with the motor rotor (2) respectively.
9. The connection structure of a screw vacuum pump rotor and a motor according to claim 8, characterized in that, The second connecting piece (10) is respectively provided with a first limiting groove (18) and a second limiting groove (19) along the length direction thereof, the first limiting groove (18) is provided with a first limiting sleeve (14), the second limiting groove (19) is provided with a second limiting sleeve (16), the first limiting sleeve (14) is arranged on the outer side of the first pressing piece (11) and is used for axially limiting the first pressing piece (11), and the second limiting sleeve (16) is arranged on the outer side of the second pressing piece (12) and is used for axially limiting the second pressing piece (12).
10. The connection structure of a screw vacuum pump rotor and a motor according to claim 1, characterized in that, The outer surface and / or the conical surface of the extension (4) is provided with a carburized layer.