Claw vacuum pump

Abstract

The utility model relates to vacuum pump technical field, concretely is claw type vacuum pump. Including claw type rotor, shaft and fixed subassembly, claw type rotor and shaft are opened with keyway respectively, fixed subassembly sets up in the keyway of claw type rotor and the keyway of shaft, is used for realizing the transmission connection of claw type rotor and shaft, fixed subassembly includes the first fixed part, second fixed part and third fixed part that set up in proper order, first fixed part has: top surface, with the clearance that sets up between the bottom surface of claw type rotor's keyway, first side, with the side of claw type rotor's keyway is bonded, first inclined plane, is located in the bottom of first fixed part, third fixed part has: bottom surface, with the bottom surface of shaft's keyway is bonded, third side, with the side of shaft's keyway is bonded, third inclined plane, is located in the top of third fixed part. It can eliminate the relative micro motion between claw type rotor and shaft, and the convenient operation of dismounting.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically a claw-type vacuum pump. Background Technology

[0002] Claw-type vacuum pumps belong to the category of positive displacement dry vacuum pumps. Their core working principle involves a pair of non-contact claw-shaped rotors rotating synchronously in opposite directions within the pump chamber. By periodically changing the volume of the working chamber, they complete the processes of gas intake, compression, and discharge. Because no lubricating fluid or working fluid is required during operation, this type of pump can provide a clean vacuum environment.

[0003] In terms of structural design, the claw rotor and pump shaft are usually constructed separately. Due to the unique shape of the pump chamber, the rotor cannot be made as a single unit with the pump shaft and must be manufactured separately before assembly. To facilitate installation and disassembly, an interference fit is not recommended between the rotor and pump shaft. Therefore, the most common connection method on the market is a clearance fit, supplemented by keys and keyways to transmit torque.

[0004] However, this clearance fit introduces certain structural weaknesses during operation. During vacuum pump operation, the rotor periodically bears the reverse force generated by gas compression. Due to the clearances between the key and keyway, and between the pump shaft and rotor shaft bore, the rotor experiences minute periodic wobble and collisions on the pump shaft under stress. Over long-term operation, this repeated impact and friction leads to wear on the rotor's inner bore, keyway, and corresponding parts of the pump shaft, thus affecting the service life of both the rotor and pump shaft. Utility Model Content

[0005] In order to solve the technical problems existing in the background art, the present invention provides a claw-type vacuum pump, which can eliminate the relative micro-movement between the claw-type rotor and the shaft, and is convenient to disassemble and assemble.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A claw-type vacuum pump includes a claw-type rotor, a shaft, and a stationary assembly; The claw-shaped rotor and the shaft are each provided with keyways; The fixing assembly is disposed in the keyway of the claw rotor and the keyway of the shaft to realize the transmission connection between the claw rotor and the shaft; the fixing assembly includes a first fixing member, a second fixing member and a third fixing member arranged in sequence; The first fastener has: A gap is provided between the top surface and the bottom surface of the keyway of the claw rotor; The first side surface is in contact with the side surface of the keyway of the claw rotor; The first inclined surface is located at the bottom of the first fixing member; The third fastener has: The bottom surface is in contact with the bottom surface of the keyway of the shaft; The third side fits against the side of the keyway of the shaft; The third inclined surface is located at the top of the third fixing member; The second fastener is disposed between the first fastener and the third fastener, and has the following characteristics: The second upper inclined surface is in contact with the first inclined surface; The second lower slope is in contact with the third slope. The second side fits against the side of the keyway of the claw rotor and the keyway of the shaft.

[0007] Furthermore, the claw-shaped rotor has a rotor threaded hole, and the bolt is screwed into the rotor threaded hole, with one end of the bolt abutting against the top surface.

[0008] Furthermore, the first fixing member is provided with a first threaded hole, which axially penetrates the first fixing member, and the opening direction of the first threaded hole faces the upper end face of the third fixing member.

[0009] Furthermore, the claw-shaped rotor has a rotor through hole, and the opening direction of the rotor through hole is towards the first threaded hole.

[0010] Furthermore, the claw-shaped rotor has a counterweight cavity, and the outer ends of the rotor through hole and the rotor threaded hole are connected to the counterweight cavity.

[0011] Furthermore, the first fixing member is located in the keyway of the claw rotor, the third fixing member is located in the keyway of the shaft, and a gap is provided between the first fixing member and the third fixing member.

[0012] The beneficial effects of this utility model are: (1) By combining the three fasteners, the claw rotor and the shaft can be fully positioned, effectively eliminating the relative micro-movement between them, thereby extending the service life.

[0013] (2) During installation, screw the bolt into the rotor thread hole to push the first fixing part down, so that the three fixing parts together fill the keyway on the claw rotor and the shaft, so as to achieve reliable fixing and suppress the micro-motion phenomenon.

[0014] (3) When disassembling, simply screw a bolt into the first threaded hole of the first fixing part and use the jacking force to separate the first and third fixing parts, so that the three fixing parts can be detached as a whole, and the claw rotor can be easily removed from the shaft. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 It is an exploded view of the fixed components; Figure 3 This is a diagram showing the installation locations of the fixed components; Figure 4 This is a schematic diagram of the claw rotor.

[0017] In the picture: 1. Claw-shaped rotor; 2. Shaft; 3. Counterweight cavity; 4. Fixing assembly; 11. Rotor through hole; 12. Rotor threaded hole; 41. First fastener; 42. Second fastener; 43. Third fastener; 411. Top surface; 412. First side surface; 413. First inclined surface; 414. First threaded hole; 421. Second upper inclined plane; 422. Second lower inclined plane; 423. Second lateral surface; 431. Bottom surface, 432. Third lateral surface, 433. Third inclined surface. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, a claw-type vacuum pump includes a claw-type rotor 1, a shaft 2, and a fixing assembly 4. The claw-type rotor 1 and the shaft 2 are each provided with a corresponding keyway. The fixing assembly 4 is disposed within the keyways of the claw-type rotor 1 and the shaft 2, and is used to achieve a transmission connection between the claw-type rotor 1 and the shaft 2.

[0020] like Figure 2 , 3 As shown in Figure 4, the specific structure of the fixing component 4 includes a first fixing member 41, a second fixing member 42, and a third fixing member 43 arranged sequentially. Through the combined connection of the three fixing members, the claw rotor 1 and the shaft 2 can be completely positioned, effectively eliminating the relative micro-movement between them, thereby extending their service life.

[0021] The first fixing member 41 has a top surface 411, and a gap is provided between the top surface 411 and the bottom surface of the keyway of the claw rotor 1. The first side surface 412 is in contact with the side surface of the keyway of the claw rotor 1. The first inclined surface 413 is provided at the bottom of the first fixing member 41, and the first inclined surface 413 faces the second fixing member 42. In a specific embodiment, the claw rotor 1 has a rotor threaded hole 12, and a bolt is screwed into the rotor threaded hole 12, with one end of the bolt abutting against the top surface 411.

[0022] During installation, screwing the bolts into the rotor threaded hole 12 will push the first fixing member 41 down, so that the three fixing members together fill the keyway on the claw rotor 1 and the shaft 2, achieving reliable fixation and suppressing fretting.

[0023] The third fixing member 43 has a bottom surface 431 that fits against the bottom surface of the keyway of the shaft 2. The third side surface 432 fits against the side surface of the keyway of the shaft 2. The third inclined surface 433 is located on the top of the third fixing member 43 and faces the second fixing member 42.

[0024] The second fixing member 42 is disposed between the first fixing member 41 and the third fixing member 43. The second fixing member 42 has a second upper inclined surface 421 and a second lower inclined surface 422. The second upper inclined surface 421 faces the first fixing member 41 and is slidably attached to the first inclined surface 413. The second lower inclined surface 422 faces the third fixing member 43 and is slidably attached to the third inclined surface 433. The second side surface 423 is attached to the side surface of the keyway of the claw rotor 1 and the keyway of the shaft 2. In a specific embodiment, the first fixing member 41 is located in the keyway of the claw rotor 1, the third fixing member 43 is located in the keyway of the shaft 2, and a gap is provided between the first fixing member 41 and the third fixing member 43.

[0025] The first fixing member 41 is provided with a first threaded hole 414, which axially penetrates the first fixing member 41, and the opening direction of the first threaded hole 414 faces the upper end face of the third fixing member 43. The claw-shaped rotor 1 is provided with a rotor through hole 11, the opening direction of which faces the first threaded hole 414. The bolt is inserted into the first threaded hole 414 through the rotor through hole 11.

[0026] During disassembly, simply screw a bolt into the first threaded hole 414 of the first fixing member 41, and use the jacking force to separate the first fixing member 41 and the third fixing member 43, so that the three fixing members can be detached as a whole, thereby easily removing the claw rotor 1 from the shaft 2.

[0027] In a specific embodiment, the claw-shaped rotor 1 is provided with a counterweight cavity 3, and the outer ends of the rotor through hole 11 and the rotor threaded hole 12 are both connected to the counterweight cavity 3. This structural design facilitates the installation and tightening of bolts. Bolt assembly is achieved through the counterweight cavity 3 without changing the main rotor structure. While maintaining the integrity of the original claw-shaped rotor 1, the processing technology is simplified and the reliability of the structure is improved.

[0028] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A claw-type vacuum pump, characterized in that, It includes a claw-shaped rotor (1), a shaft (2), and a fixing assembly (4); The claw rotor (1) and the shaft (2) are respectively provided with keyways; The fixing component (4) is disposed in the keyway of the claw rotor (1) and the keyway of the shaft (2) to realize the transmission connection between the claw rotor (1) and the shaft (2); the fixing component (4) includes a first fixing member (41), a second fixing member (42) and a third fixing member (43) arranged in sequence. The first fastener (41) has: A gap is provided between the top surface (411) and the bottom surface of the keyway of the claw rotor (1); The first side surface (412) is in contact with the side surface of the keyway of the claw rotor (1); The first inclined surface (413) is provided at the bottom of the first fixing member (41); The third fastener (43) has: The bottom surface (431) is in contact with the bottom surface of the keyway of the shaft (2); The third side (432) is in contact with the side of the keyway of the shaft (2); The third inclined surface (433) is provided on the top of the third fixing member (43); The second fastener (42) is disposed between the first fastener (41) and the third fastener (43), and has the following characteristics: The second upper inclined surface (421) is in contact with the first inclined surface (413); The second lower inclined surface (422) is in contact with the third inclined surface (433); The second side (423) is in contact with the side of the keyway of the claw rotor (1) and the keyway of the shaft (2).

2. The claw-type vacuum pump according to claim 1, characterized in that, The claw-shaped rotor (1) has a rotor threaded hole (12), and a bolt is screwed into the rotor threaded hole (12), with one end of the bolt abutting against the top surface (411).

3. The claw-type vacuum pump according to claim 1, characterized in that, The first fixing member (41) is provided with a first threaded hole (414), which axially penetrates the first fixing member (41), and the opening direction of the first threaded hole (414) faces the upper end face of the third fixing member (43).

4. The claw-type vacuum pump according to claim 3, characterized in that, The claw-shaped rotor (1) has a rotor through hole (11) and the opening direction of the rotor through hole (11) is towards the first threaded hole (414).

5. The claw-type vacuum pump according to claim 2 or 4, characterized in that, The claw-shaped rotor (1) has a counterweight cavity (3), and the outer ends of the rotor through hole (11) and the rotor threaded hole (12) are connected to the counterweight cavity (3).

6. The claw-type vacuum pump according to claim 1, characterized in that, The first fixing member (41) is located in the keyway of the claw rotor (1), and the third fixing member (43) is located in the keyway of the shaft (2). A gap is provided between the first fixing member (41) and the third fixing member (43).

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