Composite vacuum pump rotor

Abstract

The utility model discloses a composite vacuum pump rotor which comprises a pump shaft single body and a rotor body arranged on the peripheral face of the pump shaft single body, a rotating sleeve is integrally formed on the inner wall of the rotor body, and a four-key-groove connecting structure used for reducing radial looseness of the rotor body is arranged between the rotating sleeve and the pump shaft single body. A front shaft cover is fixed to one end of the pump shaft single body in a bolted mode, a flange plate is integrally formed at the opening position of the end, close to the front shaft cover, of the rotating sleeve, and the front shaft cover and the flange plate are in bolted connection. Radial loosening of the rotor body is avoided, dynamic balance of the rotor is guaranteed through close matching, excessive vibration cannot be generated in the high-speed running process of the rotor, the rotor body and the rotating sleeve are fixed through the front shaft cover, axial movement of the rotor body can be effectively prevented, and the service life of the rotor is prolonged. The contact surfaces between the rotor body and the pump cavity are kept consistent, and abrasion is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, and particularly relates to a composite vacuum pump rotor. Background Art

[0002] The rotor of a vacuum pump is the core component for realizing gas extraction and compression, and its design and structure directly affect the performance of the pump. The main function of the rotor is to change the volume of the pump cavity through rotational motion, thereby generating a pressure difference to promote the inflow of gas from the inlet and its effective discharge. There are various types of rotors, commonly including sliding vane rotors, spiral rotors, impeller rotors, and gear rotors, etc. Taking a sliding vane vacuum pump as an example, in its structure, sliding vanes are embedded inside the rotor, and these sliding vanes are in close contact with the pump cavity wall under the action of centrifugal force to form a sealed cavity. During the rotation of the pump, gas is first inhaled into the sealed cavity. As the rotor rotates, the volume of the sealed cavity gradually decreases, the gas is compressed, and finally it is discharged to the external environment under the rotation of the rotor; for example, a vacuum pump rotor disclosed in the authorized publication number CN210440209U includes a main shaft, a rotating unit, and a coating layer. The rotating unit is arranged on the main shaft and is composed of equally spaced rotating parts. Notches are formed between the rotating parts, and round holes are provided on the rotating parts. The rotating unit can be set as a two-blade rotating unit and a three-blade rotating unit. The coating layer wraps it according to the contour of the rotating unit, fills the notches and round holes, wraps the rotor, and the coating layer is not easy to fall off. During high-speed rotation, the coating layer also plays a lubricating role, reducing the friction between the rotor and the pump body. However, when connecting the rotor to the main shaft in this technical solution, a keyway fit method is often used to connect the rotor and the main shaft. However, this connection method has problems of axial movement and radial looseness. The axial movement of the rotor will cause the contact state between the rotor and the pump cavity wall to be unstable, resulting in increased wear of various parts during long-term operation, and further affecting the service life of the rotor. And the radial looseness makes the center of gravity of the rotor deviate from the rotation center, resulting in imbalance during operation, and the reduction of its dynamic balance will cause the vibration to increase further. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a composite vacuum pump rotor. The pump shaft monomer and the rotor body are sleeved through a rotating sleeve. When sleeving, a four-keyway connection structure is used for assembly between the rotating sleeve and the pump shaft monomer. At the same time, a front shaft cover is bolted and fixed at one end of the pump shaft monomer, and the front shaft cover is used to block the rotor body and the rotating sleeve, thereby preventing the rotor body from having axial movement and radial looseness, so as to solve the problems raised in the above background art.

[0004] To achieve the above object, the utility model provides the following technical solution: A composite vacuum pump rotor, including a pump shaft monomer and a rotor body disposed on the outer peripheral surface of the pump shaft monomer. An adapter sleeve is integrally formed on the inner wall of the rotor body. A four-keyway connection structure for reducing radial looseness of the rotor body is provided between the adapter sleeve and the pump shaft monomer. A front shaft cover is bolted and fixed to one end of the pump shaft monomer. A flange is integrally formed at the opening position of one end of the adapter sleeve close to the front shaft cover, and the front shaft cover and the flange are bolted to each other.

[0005] Preferably, the four-keyway connection structure includes four equally spaced first internal threaded holes opened on the outer peripheral surface of the pump shaft monomer and four equally spaced long rectangular tongues integrally formed on the inner wall of the adapter sleeve. The long rectangular tongues and the first internal threaded holes are slidably inserted.

[0006] Preferably, four equally spaced short rectangular tongues are integrally formed on the inner wall of the front shaft cover, and the short rectangular tongues and the first internal threaded holes are slidably inserted.

[0007] Preferably, a circular convex portion is integrally formed on the outer wall of the front shaft cover away from the pump shaft monomer. A counterbore is provided at the central position inside the circular convex portion. A cut groove concentric with the counterbore is provided at one end of the pump shaft monomer close to the front shaft cover. A locking pin for screw-threaded cooperation with the cut groove is installed inside the counterbore.

[0008] Preferably, a plurality of second internal threaded holes are provided on the outer wall of the adapter sleeve, and third internal threaded holes concentric with the second internal threaded holes are provided on the outer wall of the front shaft cover.

[0009] Preferably, a tension type shaft seal structure in contact with the outer peripheral surface of the pump shaft monomer is provided on the inner wall of the adapter sleeve.

[0010] Preferably, the tension type shaft seal structure includes two annular cutting grooves provided on the inner wall of the adapter sleeve and rubber sealing rings embedded inside the annular cutting grooves.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: The composite vacuum pump rotor is provided with a four-keyway connection structure, a front shaft cover and other mutually cooperating structures. The four-keyway connection structure makes the cooperation between the adapter sleeve and the pump shaft monomer closer, avoiding radial looseness of the rotor body. This close cooperation ensures the dynamic balance of the rotor, so that it will not generate excessive vibration during high-speed operation. By fixing the rotor body and the adapter sleeve with the front shaft cover, axial movement of the rotor body can be effectively prevented, making the contact surface between the rotor body and the pump cavity consistent, reducing wear, and thus prolonging the service life of the pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic three-dimensional structure of the utility model Figure 1 ;

[0013] Figure 2 Schematic three-dimensional structure of the present utility model Figure 2 ;

[0014] Figure 3 Schematic three-dimensional sectional structure diagram of the present utility model;

[0015] Figure 4 Schematic three-dimensional structure diagram of the pump shaft unit of the present utility model;

[0016] Figure 5 Schematic three-dimensional sectional structure diagram of the rotating sleeve of the present utility model;

[0017] Figure 6 Schematic three-dimensional sectional structure diagram of the front shaft cover of the present utility model.

[0018] In the figure: 1. Pump shaft unit; 101. First internal thread hole; 102. Groove; 2. Rotating sleeve; 201. Flange; 202. Second internal thread hole; 3. Rotor body; 4. Front shaft cover; 401. Third internal thread hole; 5. Circular convex part; 501. Counterbore; 6. Locking pin; 7. Long rectangular tongue; 8. Tightening shaft seal structure; 801. Annular cutting groove; 802. Rubber sealing ring; 9. Short rectangular tongue. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1-6 , an embodiment provided by the present utility model: A composite vacuum pump rotor includes a pump shaft unit 1 and a rotor body 3 disposed on the outer peripheral surface of the pump shaft unit 1. A rotating sleeve 2 is integrally formed on the inner wall of the rotor body 3. A four-key groove connection structure for reducing the radial looseness of the rotor body 3 is disposed between the rotating sleeve 2 and the pump shaft unit 1. One end of the pump shaft unit 1 is bolted and fixed with a front shaft cover 4. A flange 201 is integrally formed at the opening position of one end of the rotating sleeve 2 close to the front shaft cover 4. The front shaft cover 4 and the flange 201 are bolted to each other;

[0021] A plurality of second internal thread holes 202 are disposed on the outer wall of the rotating sleeve 2, and third internal thread holes 401 concentric with the second internal thread holes 202 are disposed on the outer wall of the front shaft cover 4;

[0022] The four-key groove connection structure includes four equally spaced first internal threaded holes 101 formed on the outer peripheral surface of the pump shaft unit 1 and four equally spaced long rectangular tongues 7 integrally formed on the inner wall of the rotating sleeve 2. The long rectangular tongues 7 and the first internal threaded holes 101 are slidably inserted. When the pump shaft unit 1 and the rotating sleeve 2 are connected, the four long rectangular tongues 7 on the inner wall of the rotating sleeve 2 are slidably engaged with the cutting grooves 102 on the outer peripheral surface of the pump shaft unit 1 until the long rectangular tongues 7 slide to the terminal positions of the cutting grooves 102. The contact area of the four-key grooves is larger, so as to reduce the radial looseness of the rotor body 3, thereby providing better force transmission. When the rotor body 3 rotates at a high speed, it can extract and compress gas more stably;

[0023] Four equally spaced short rectangular tongues 9 are integrally formed on the inner wall of the front axle cover 4. The short rectangular tongues 9 and the first internal threaded holes 101 are slidably inserted. A circular convex portion 5 is integrally formed on the outer wall of the front axle cover 4 away from the pump shaft unit 1. A counterbore 501 is provided at the central position inside the circular convex portion 5. A cutting groove 102 concentric with the counterbore 501 is provided at one end of the pump shaft unit 1 close to the front axle cover 4. A locking pin 6 for threadedly engaging with the cutting groove 102 is installed inside the counterbore 501;

[0024] When the pump shaft unit 1 and the front axle cover 4 are assembled, the front axle cover 4 is slidably engaged with the first internal threaded holes 101 through the short rectangular tongues 9 until the pump shaft unit 1 enters the inside of the circular convex portion 5. Then the staff takes out the locking pin 6 and screws the locking pin 6 into the cutting groove 102 through the counterbore 501 until the front axle cover 4 and the pump shaft unit 1 are tightly assembled;

[0025] A tension-type shaft seal structure 8 in contact with the outer peripheral surface of the pump shaft unit 1 is provided on the inner wall of the rotating sleeve 2. The tension-type shaft seal structure 8 includes two annular cutting grooves 801 provided on the inner wall of the rotating sleeve 2 and a rubber sealing ring 802 embedded inside the annular cutting grooves 801. A tension-type shaft seal structure 8 is provided on the inner wall surface of the rotor body 3 and the outer wall of the pump shaft unit 1. The rubber sealing ring 802 is embedded inside the annular cutting grooves 801. Through the tensioning action of the rubber sealing ring 802, the rubber sealing ring 802 can form a tight contact with the pump shaft unit 1 and the rotor body 3, reducing the possibility of gas passing through the gap, thereby effectively preventing air leakage.

[0026] When the embodiment of the present application is in use, first, the staff takes out the pump shaft monomer 1, the rotor body 3 and the front shaft cover 4 to be assembled, and assembles the pump shaft monomer 1 and the rotating sleeve 2 together through the four-keyway connection structure until the pump shaft monomer 1 and the rotating sleeve 2 are assembled in place. With the four-keyway connection structure, the fit between the rotating sleeve 2 and the pump shaft monomer 1 is tighter, avoiding radial loosening of the rotor body 3. This tight fit ensures the dynamic balance of the rotor, preventing excessive vibration during high-speed operation. Subsequently, the front shaft cover 4 is docked at one end of the pump shaft monomer 1, and the pump shaft monomer 1 and the front shaft cover 4 are docked in place for bolt connection and positioning. At this time, the pump shaft monomer 1 and the front shaft cover 4 are fixed together. Then, the staff takes out another bolt, which is screwed into the internal thread hole two 202 of the flange 201 from the internal thread hole three 401 of the front shaft cover 4 until the front shaft cover 4 is fixed to the rotor body 3 through the flange 201. At this time, the front shaft cover 4 blocks and limits the rotor body 3 at the end of the pump shaft monomer 1. By fixing the front shaft cover 4 to the rotor body 3 and the rotating sleeve 2, the axial movement of the rotor body 3 can be effectively prevented, ensuring that the contact surface between the rotor body 3 and the pump cavity remains consistent, reducing wear, and thus extending the service life of the pump body. At the same time, the reduction of radial loosening and axial movement of the rotor body 3 ensures that the rotor will not shift during high-speed rotation, further enhancing the stability and reliability of the vacuum pump.

[0027] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A composite vacuum pump rotor, characterized in that: It includes a pump shaft monomer (1) and a rotor body (3) arranged on the outer peripheral surface of the pump shaft monomer (1). A rotating sleeve (2) is integrally formed on the inner wall of the rotor body (3). A four-keyway connection structure for reducing the radial looseness of the rotor body (3) is arranged between the rotating sleeve (2) and the pump shaft monomer (1). One end of the pump shaft monomer (1) is bolted and fixed with a front shaft cover (4). A flange (201) is integrally formed at the opening position of one end of the rotating sleeve (2) close to the front shaft cover (4). The front shaft cover (4) and the flange (201) are bolted to each other.

2. The composite vacuum pump rotor according to claim 1, characterized in that: The four-keyway connection structure includes four equally spaced first internal threaded holes (101) opened on the outer peripheral surface of the pump shaft monomer (1) and four equally spaced long rectangular tongues (7) integrally formed on the inner wall of the rotating sleeve (2). The long rectangular tongues (7) and the first internal threaded holes (101) are slidably inserted.

3. The composite vacuum pump rotor according to claim 2, wherein: Four equally spaced short rectangular tongues (9) are integrally formed on the inner wall of the front shaft cover (4). The short rectangular tongues (9) and the first internal threaded holes (101) are slidably inserted.

4. A composite vacuum pump rotor according to claim 1, characterized in that: A circular convex part (5) is integrally formed on the outer wall of the side of the front shaft cover (4) away from the pump shaft monomer (1). A counterbore (501) is arranged at the central position inside the circular convex part (5). A cut groove (102) concentric with the counterbore (501) is arranged at one end of the pump shaft monomer (1) close to the front shaft cover (4). A locking pin (6) for threadedly mating with the cut groove (102) is installed inside the counterbore (501).

5. A composite vacuum pump rotor according to claim 1, characterized in that: A number of second internal threaded holes (202) are arranged on the outer wall of the rotating sleeve (2). Third internal threaded holes (401) concentric with the second internal threaded holes (202) are arranged on the outer wall of the front shaft cover (4).

6. A composite vacuum pump rotor according to claim 1, characterized in that: A tensioning shaft seal structure (8) in contact with the outer peripheral surface of the pump shaft monomer (1) is arranged on the inner wall of the rotating sleeve (2).

7. A composite vacuum pump rotor according to claim 6, characterized in that: The tensioning shaft seal structure (8) includes two annular cutting grooves (801) arranged on the inner wall of the rotating sleeve (2) and rubber sealing rings (802) embedded inside the annular cutting grooves (801).

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