Connecting structure of rotor and motor assembly of screw vacuum pump

Abstract

The utility model relates to the technical field of screw vacuum pumps, in particular to a screw vacuum pump rotor and motor assembly connecting structure which comprises a screw vacuum pump rotor and a motor assembly arranged outside the screw vacuum pump rotor in a sleeving mode. A buffering piece is arranged between the screw vacuum pump rotor and the motor assembly, a limiting groove is formed in the outer surface of the screw vacuum pump rotor, and the buffering piece is arranged in the limiting groove. According to the screw vacuum pump, the buffering piece is arranged between the screw vacuum pump rotor and the motor assembly, the buffering piece can reduce vibration and impact generated by the screw vacuum pump rotor and the motor rotor to a large extent when the screw vacuum pump operates, on one hand, noise can be reduced, and on the other hand, stable operation of the motor and other components can be ensured.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of screw vacuum pumps, in particular to a connecting structure of a screw vacuum pump rotor and a motor assembly. BACKGROUND

[0002] A screw vacuum pump is a device for transporting gas by volume change between intermeshing screws. The screw vacuum pump has a pair of screws, which are finely dynamically balanced, supported by bearings, and installed in a pump housing. There is a certain gap between the screws, so there is no friction between them during operation, and the operation is stable and low noise. The working cavity does not require lubricating oil. With the rotation of the screw vacuum pump rotor, the sealing cavity between the intermeshing rotors and the housing of the screw vacuum pump is continuously formed at one end and continuously disappears at the other end, allowing continuous and pulse-free suction of gas from one end and discharge from the other end, thereby achieving the function of vacuum pumping. Due to its simple structure and stable operation, the screw vacuum pump is widely used in chemical industry, pharmaceutical industry, food industry, and semiconductor and electronic industry.

[0003] During operation of the screw vacuum pump, the screw pump rotor and the motor rotor will produce certain vibration, which not only produces a lot of noise, but also may affect the stability of the motor operation. CONTENT OF THE INVENTION

[0004] In view of the deficiencies or problems in the prior art, the present disclosure provides a connecting structure of a screw vacuum pump rotor and a motor assembly to reduce the noise of the screw vacuum pump during operation.

[0005] The technical solution adopted by the present disclosure to solve the above technical problems is: a connecting structure of a screw vacuum pump rotor and a motor assembly, comprising a screw vacuum pump rotor and a motor assembly sleeved outside the screw vacuum pump rotor, a buffer member is arranged between the screw vacuum pump rotor and the motor assembly, the outer surface of the screw vacuum pump rotor is provided with a limiting groove, and the buffer member is arranged in the limiting groove.

[0006] As a preferred embodiment, the motor assembly comprises a motor rotor and a connecting sleeve, the motor rotor is sleeved outside the connecting sleeve, the connecting sleeve is arranged between the motor rotor and the screw vacuum pump rotor, and the outer surface of the buffer member is attached to the connecting sleeve.

[0007] As a preferred embodiment, the limiting groove is an annular groove, and the buffer member is an annular structure.

[0008] As a preferred embodiment, the buffer member is an elastic stamping part.

[0009] As a preferred embodiment, the screw vacuum pump rotor comprises a first segment and a second segment, the limiting groove is arranged between the first segment and the second segment, the diameter of the first segment is larger than the diameter of the second segment, the first segment is in contact with the connecting sleeve, and the second segment is arranged in the first gap between the connecting sleeve.

[0010] As a preferred embodiment, the screw vacuum pump rotor further comprises a third segment, the third segment is arranged close to the second segment, and the diameter of the third segment is smaller than the diameter of the second segment.

[0011] As a preferred embodiment, the inner circumferential wall of the connecting sleeve is provided with a recessed segment, the recessed segment is arranged opposite to the third segment, and the second gap is arranged between the recessed segment and the connecting sleeve; the second gap is larger than the first gap.

[0012] As a preferred embodiment, the spacer assembly comprises a first spacer and a second spacer arranged at both ends of the motor rotor, one end of the connecting sleeve is provided with an annular protrusion, the first spacer is arranged between the annular protrusion and the motor rotor, and the annular protrusion is used for axially limiting the first spacer.

[0013] Compared with the prior art, the application can reduce the vibration and impact generated by the screw vacuum pump rotor and the motor rotor during the operation of the screw vacuum pump to a great extent by arranging the buffer between the screw vacuum pump rotor and the motor assembly, which can reduce the noise on the one hand and ensure the stable operation of the motor and other components on the other hand. BRIEF DESCRIPTION OF DRAWINGS

[0014] The application will be described in further detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments and thus should not be regarded as a limitation on the scope of the application. In addition, unless specifically indicated, the drawings only schematically represent the composition or structure of the described objects and can contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0015] Figure 1 is one of the cross-sectional views of the connecting structure of the screw vacuum pump rotor and the motor assembly of the present disclosure;

[0016] Figure 2 is the second cross-sectional view of the connecting structure of the screw vacuum pump rotor and the motor assembly of the present disclosure;

[0017] Figure 3 is a partial enlarged view of A in the present disclosure Figure 2

[0018] Figure 4 is a structural schematic view of the connecting structure of the screw vacuum pump rotor and the motor assembly of the present disclosure;

[0019] ​Figure 5 is a structural schematic view of a screw vacuum pump rotor of the present disclosure;

[0020] Figure 6 is a structural schematic view of a connecting sleeve of the present disclosure;

[0021] Figure 7 is a sectional view of the connecting sleeve of the present disclosure.

[0022] Legend:

[0023] 1, screw vacuum pump rotor; 2, motor rotor; 3, connecting sleeve; 4, buffer; 5, first gasket; 6, second gasket; 7, first gap; 8, second gap; 9, annular protrusion; 10, first section; 11, second section; 12, third section; 13, recessed section; 14, limiting groove. DETAILED DESCRIPTION

[0024] 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 in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present disclosure and do not limit the present disclosure.

[0025] Those skilled in the art should understand that in the disclosure of the present utility model, the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as limiting the present utility model.

[0026] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the application provides a connecting structure of a screw vacuum pump rotor and a motor assembly, which comprises a screw vacuum pump rotor 1 and a motor assembly sleeved outside the screw vacuum pump rotor 1. An annular buffer 4 is arranged between the screw vacuum pump rotor 1 and the motor assembly. The outer surface of the screw vacuum pump rotor 1 is provided with a limiting groove 14, and the buffer 4 is arranged in the limiting groove 14. Specifically, the limiting groove 14 is an annular groove. The limiting groove 14 is arranged to axially limit the buffer 4, so as to avoid the buffer 4 from moving along the axial direction of the screw vacuum pump rotor 1, and to more stably limit the buffer 4 at a specific position of the screw vacuum pump rotor 1. 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 arranged between the motor rotor 2 and the screw vacuum pump rotor 1. The outer surface of the buffer 4 is attached to the connecting sleeve 3. During assembly, the connecting sleeve 3 is heated and then pressed to the outside of the screw vacuum pump rotor 1. The buffer performance of the buffer 4 reduces the vibration and impact of the motor rotor 2 and the screw vacuum pump rotor 1 during operation, so as to better protect the motor and other components of the screw vacuum pump.

[0027] It should be noted that the buffer 4 is an elastic stamping part. The elastic stamping part can be manufactured by stamping, shearing, bending and other processing methods of metal materials through a mold to form a stamping part. The elastic stamping part has high strength, hardness and certain elasticity, high surface finish, can withstand large impact force, has high size accuracy and shape accuracy, is convenient to install and disassemble, has relatively simple manufacturing process, high production efficiency of stamping processing, and is easy to operate, realize mechanization and automation. Since the elastic stamping part has elasticity, it has a buffering effect to reduce noise and reduce the impact between the motor rotor 2 and the screw vacuum pump rotor 1, thereby increasing the flexibility and reliability of the connection between the motor rotor 2 and the screw vacuum pump rotor 1.

[0028] Please continue to refer to Figure 3 and Figure 5 As shown, in particular, the screw vacuum pump rotor 1 comprises a first section 10 and a second section 11. The limiting groove 14 is arranged between the first section 10 and the second section 11. The diameter of the first section 10 is greater than the diameter of the second section 11. The first section 10 is attached to the connecting sleeve 3. A first gap 7 is arranged between the second section 11 and the connecting sleeve 3. The outer peripheral wall of the connecting sleeve 3 is attached to the motor rotor 2. The inner peripheral wall of the connecting sleeve 3 is attached to the first section 10, so that the support of the screw vacuum pump rotor 1 to the connecting sleeve 3 is mainly in the first section 10. In addition, since the outer surface of the buffer 4 is attached to the connecting sleeve 3, the buffer 4 not only has a buffering effect, but also has a supporting effect.

[0029] Please refer to Figure 6 and Figure 7As shown, further, the screw vacuum pump rotor 1 further comprises a third section 12, the third section 12 is arranged close to the second section 11, and the diameter of the third section 12 is smaller than that of the second section 11. The inner circumferential wall of the connecting sleeve 3 is provided with a recessed section 13, the recessed section 13 is arranged opposite to the third section 12, and a second gap 8 is arranged between the recessed section 13 and the connecting sleeve 3; the second gap 8 is larger than the first gap 7. The recessed section 13 is arranged to make the connecting sleeve 3 and the screw vacuum pump rotor 1 have a larger gap. Since the connecting sleeve 3 is pressed to the outside of the screw vacuum pump rotor 1 after being heated, the first gap 7 and the second gap 8 are arranged to reduce the friction between the connecting sleeve 3 and the screw vacuum pump rotor 1, so as to facilitate the installation of the connecting sleeve 3.

[0030] As shown in FIG. 1, the connecting sleeve 3 is arranged between the motor rotor 2 and the screw vacuum pump rotor 1, and the connecting sleeve 3 is arranged to connect the motor rotor 2 and the screw vacuum pump rotor 1. Figure 2 and Figure 4 As shown in FIG. 1, the connecting sleeve 3 is arranged between the motor rotor 2 and the screw vacuum pump rotor 1, and the connecting sleeve 3 is arranged to connect the motor rotor 2 and the screw vacuum pump rotor 1.

[0031] The above has introduced the present application in detail, and the principle and implementation mode of the present application have been described by applying specific examples. The above description of the embodiments is only for helping to understand 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 in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. Connection structure of a screw vacuum pump rotor and a motor assembly, characterized in that, The screw vacuum pump rotor (1) and the motor assembly are arranged with the buffer (4) between the screw vacuum pump rotor (1) and the motor assembly, the outer surface of the screw vacuum pump rotor (1) is provided with the limiting groove (14), and the buffer (4) is arranged in the limiting groove (14).

2. The screw vacuum pump rotor and motor assembly connection structure according to claim 1, characterized in that The limiting groove (14) is an annular groove, and the buffer (4) is an annular structure.

3. The screw vacuum pump rotor and motor assembly connection structure according to claim 1 or 2, characterized in that The buffer (4) is an elastic stamping part.

4. The screw vacuum pump rotor and motor assembly connection structure according to claim 1, characterized in that, The motor assembly includes 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 arranged between the motor rotor (2) and the screw vacuum pump rotor (1), and the outer surface of the buffer (4) is attached to the connecting sleeve (3).

5. The screw vacuum pump rotor and motor assembly connection structure according to claim 4, characterized in that The screw vacuum pump rotor (1) includes a first section (10) and a second section (11), the limiting groove (14) is arranged between the first section (10) and the second section (11), the diameter of the first section (10) is greater than that of the second section (11), the first section (10) is attached to the connecting sleeve (3), and the first section (10) is arranged between the second section (11) and the connecting sleeve (3).

6. The screw vacuum pump rotor and motor assembly connection structure according to claim 5, characterized in that The screw vacuum pump rotor (1) further includes a third section (12), the third section (12) is arranged close to the second section (11), and the diameter of the third section (12) is smaller than that of the second section (11).

7. A screw vacuum pump rotor and motor assembly connection structure according to claim 6, characterized in that The inner peripheral wall of the connecting sleeve (3) is provided with a recessed section (13), the recessed section (13) is arranged opposite to the third section (12), and the second gap (8) is arranged between the recessed section (13) and the connecting sleeve (3); the second gap (8) is greater than the first gap (7).

8. The screw vacuum pump rotor and motor assembly connection structure according to claim 3, characterized in that Further comprising a gasket assembly, the gasket assembly includes a first gasket (5) and a second gasket (6) arranged at both ends of the motor rotor (2), one end of the connecting sleeve (3) is provided with an annular protrusion (9), the first gasket (5) is arranged between the annular protrusion (9) and the motor rotor (2), and the annular protrusion (9) is used for axially limiting the first gasket (5).

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