Rotor structure of rotary-vane vacuum pump

Abstract

The utility model discloses a rotary vane type vacuum pump rotor structure which comprises a rotor body and an outer ring shell installed on the peripheral face of the rotor body in a bolting mode, rectangular cutting parts are arranged on the two sides of the surface of the outer ring shell and the two sides of the surface of the rotor body respectively, and a concave cavity is formed in the position, on one side of each rectangular cutting part, in the rotor body. The interior of the rectangular cutting part is slidably provided with a rotary vane single body which penetrates through the exterior of the outer ring shell, and the interior of the cavity is provided with a double-spring sliding and pushing structure which is used for forcing the rotary vane single body to be away from the central axis of the rotor body all the time. The double-spring sliding and pushing structure is adopted, even and moderate pressure can be provided between the rotary vane and the inner wall of the pump shell, compared with a single spring, the double springs can more effectively disperse acting points of force, poor contact caused by uneven pressure in the rotating process of the rotary vane is avoided, and the service life of the rotary vane is prolonged. This uniform contact can significantly reduce the possibility of gas leakage, ensuring that the pump can maintain a high vacuum state.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pump rotors, in particular to a rotary vane vacuum pump rotor structure. Background Art

[0002] The rotor structure of a rotary vane vacuum pump is the core of its operation, directly affecting the pump's performance, efficiency, and lifespan. The rotor is typically cylindrical or elliptical and made of aluminum alloy or cast iron, offering excellent mechanical strength and wear resistance. The rotor body is equipped with multiple grooves for mounting the movable vanes. The pump casing surrounds the rotor and vanes, and its interior surface is precision-machined to ensure sealing performance. It also features inlet and exhaust ports for the intake and exhaust of gases. During operation, the rotor rotates at high speed within the pump casing, and the vanes, under the action of centrifugal force, cling to the inner wall of the pump casing, forming a continuously changing working chamber. As the rotor rotates, gas enters the pump chamber through the inlet. As the rotor rotates, the gas volume gradually decreases, and is compressed into the exhaust port for discharge. This process is divided into three stages: suction, compression and exhaust, which ensures efficient gas processing capabilities. At present, the vane is a movable component located on the rotor, usually made of spring material or other elastic material, which can slide freely in the rotor groove. The number of vanes is generally two or three, and the shape of the vane is usually long and the edges are finely processed to reduce friction and improve sealing performance. However, in order to ensure that the vane is always in contact with the inner wall of the pump casing during rotation, a spring is set in the groove to ensure that the vane is always in contact with the inner wall of the pump casing. The spring is used to ensure that the vane is always in contact with the inner wall of the pump casing. However, the elastic force of a single spring can easily make the vane insufficiently contact with the inner wall of the pump casing, that is, the elastic force of the spring is not strong enough, and the vane cannot fully fit the inner wall of the pump casing, which will lead to poor sealing effect and cause gas leakage in the pump chamber, thereby reducing the overall performance and pumping efficiency of the pump. Utility Model Content

[0003] The purpose of the present utility model is to provide a rotor structure of a rotary vane vacuum pump, in which an outer ring shell with a smooth surface and no burrs is bolted to the outer peripheral surface of the rotor body, and the interiors of the outer ring shell and the rotor body are provided with interconnected rectangular cutouts and concave cavities, and a double-spring sliding structure is provided in the concave cavity for forcing the rotary vane unit to maintain contact with the inner wall surface of the pump casing, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rotary vane vacuum pump rotor structure, comprising a rotor body and an outer ring shell bolted to the outer peripheral surface of the rotor body, rectangular cut-out portions are provided on both sides of the outer ring shell and the rotor body surface, and a concave cavity is provided inside the rotor body on one side of the rectangular cut-out portion, a rotary vane unit penetrating to the outside of the outer ring shell is slidably installed inside the rectangular cut-out portion, and a double-spring sliding structure is installed inside the concave cavity for forcing the rotary vane unit to always stay away from the central axis of the rotor body.

[0005] Preferably, the outer ring shell is made of alloy steel, and the surface of the outer ring shell is smooth and free of burrs.

[0006] Preferably, an eccentric hole for fitting with a vacuum pump shaft is provided on one side of the surface of the rotor body, and a spline groove is provided on the inner wall of the eccentric hole.

[0007] Preferably, an annular inner edge is provided on the inner wall of the outer ring shell, and the inner wall surface of the annular inner edge is provided with a plurality of equally spaced circular protrusions extending toward the central axis of the rotor body, and the outer peripheral surface of the rotor body is integrally formed with a plurality of columnar protrusions concentric with the circular protrusions, and a positioning bolt is installed on the outer wall of one side of the circular protrusion, and the threaded end of the positioning bolt extends to the interior of the columnar protrusion.

[0008] Preferably, a shaft sleeve which is concentric with the rotor body is provided on the outer wall of the rotor body on one side of the eccentric hole.

[0009] Preferably, the double-spring sliding structure includes two right-angled seats installed inside the concave cavity, an inverted U-shaped slider slidably installed between the two right-angled seats, and a coil spring fixed inside the concave cavity, and the top of the coil spring is fixedly connected to the top wall of the inverted U-shaped slider.

[0010] Preferably, a countersunk hole is provided inside the inverted U-shaped slider, and a bolt for fixing the inverted U-shaped slider and the rotary vane unit is installed inside the countersunk hole.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the rotor structure of the vane vacuum pump adopts a double-spring sliding structure, the main advantage of which is that it can provide uniform and moderate pressure between the vane and the inner wall of the pump casing. Compared with a single spring, the double spring can more effectively disperse the points of force application, avoiding poor contact of the vane due to uneven pressure during rotation. This uniform contact can significantly reduce the possibility of gas leakage, ensuring that the pump can maintain a high vacuum state, thereby improving its overall sealing performance, and the double spring design can reduce the burden of a single spring, thereby reducing the risk of fatigue failure, and can maintain a relatively constant contact force between the vane and the pump casing, so that the vane can distribute friction more evenly during wear, thereby extending the service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model Figure 1 ;

[0014] Figure 3This is a schematic diagram of the three-dimensional structure of the utility model Figure 2 ;

[0015] Figure 4 This is a schematic diagram of the three-dimensional structure of the rotor body of the present invention;

[0016] Figure 5 It is a schematic diagram of the three-dimensional structure of the elastic sliding structure of the utility model.

[0017] In the figure: 1. Rotor body; 101. Columnar protrusion; 2. Outer ring shell; 201. Annular inner edge; 202. Circular protrusion; 203. Positioning bolt; 3. Eccentric hole; 301. Spline groove; 4. Bushing; 5. Rectangular cutout; 6. Concave cavity; 7. Double-spring sliding structure; 701. Right-angle stand; 702. Inverted U-shaped slider; 703. Coil spring; 8. Rotary vane unit. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-5 The present invention provides an embodiment of a rotary vane vacuum pump rotor structure, comprising a rotor body 1 and an outer ring shell 2 bolted to the outer circumference of the rotor body 1. An eccentric hole 3 for fitting with a vacuum pump shaft is provided on one side of the rotor body 1, and a spline groove 301 is provided on the inner wall of the eccentric hole 3. A concentric sleeve 4 is provided on the outer wall of the rotor body 1 on one side of the eccentric hole 3.

[0020] Rectangular cutouts 5 are provided on both sides of the outer ring shell 2 and the rotor body 1. A concave cavity 6 is provided inside the rotor body 1 on one side of the rectangular cutout 5. A rotor unit 8 extending to the outside of the outer ring shell 2 is slidably mounted inside the rectangular cutout 5. A dual-spring sliding structure 7 is installed inside the concave cavity 6 to force the rotor unit 8 to always stay away from the central axis of the rotor body 1. The rectangular cutout 5 and concave cavity 6 provide space for the sliding of the rotor unit 8 and the arrangement of the dual-spring sliding structure 7, ensuring that both can operate stably.

[0021] The outer ring shell 2 is made of alloy steel, and the surface of the outer ring shell 2 is smooth and burr-free. The smooth surface of the outer ring shell 2 can also reduce the wear of the rotor when it contacts it, thereby improving wear resistance.

[0022] The inner wall of the outer ring shell 2 is provided with an annular inner edge 201, and the inner wall surface of the annular inner edge 201 is provided with a plurality of equally spaced convex portions 202 extending toward the central axis of the rotor body 1. The outer peripheral surface of the rotor body 1 is integrally formed with a plurality of cylindrical protrusions 101 concentric with the circular protrusions 202. A positioning bolt 203 is installed on the outer wall of one side of the circular protrusion 202. The threaded end of the positioning bolt 203 extends to the inside of the cylindrical protrusion 101. The rotor body 1 and the outer ring shell 2 are in the process of During assembly, the rotor body 1 is concentrically fitted into the interior of the outer ring shell 2, with each cylindrical protrusion 101 and the circular protrusion 202 in a concentric state. The circular protrusion 202 and the cylindrical protrusion 101 are then connected using the positioning bolts 203 to ensure that the rotor body 1 and the outer ring shell 2 are stably installed. This connection method ensures that the outer ring shell 2 will not shift due to vibration or centrifugal force during operation, thereby maintaining the stable position between the rotor body 1, the outer ring shell 2 and the inner wall of the pump casing.

[0023] The double-spring sliding structure 7 includes two right-angled seats 701 installed inside the cavity 6, an inverted U-shaped slider 702 slidably installed between the two right-angled seats 701, and a coil spring 703 fixed inside the cavity 6. The top of the coil spring 703 is fixedly connected to the top wall of the inverted U-shaped slider 702. The inverted U-shaped slider 702 is provided with a countersunk hole inside, and a bolt for fixing the inverted U-shaped slider 702 and the rotor unit 8 is installed inside the countersunk hole.

[0024] The coil spring 703 will force the inverted U-shaped slider 702 to always slide in the extension direction of the right-angle seat 701, that is, the inverted U-shaped slider 702 and the rotor monomer 8 are always in contact with the inner wall of the pump casing under the elastic force of the coil spring 703, reducing the poor contact of the rotor monomer 8 caused by uneven pressure during the rotation process; while the right-angle seat 701 only allows the inverted U-shaped slider 702 and the rotor monomer 8 to slide in the axial direction, reducing the slip polarization of the rotor monomer 8.

[0025] When the embodiment of the present application is in use, the staff first assembles the rotor body 1 to the pump shaft of the vacuum pump, and the pump shaft drives the rotor body 1, the outer ring shell 2 and the vane monomer 8 to rotate inside the pump casing. As the pump shaft, the rotor body 1, the outer ring shell 2 and the vane monomer 8 rotate, the vane monomer 8 is tightly attached to the inner wall of the pump casing under the action of the double spring sliding structure 7, forming a plurality of constantly changing working chambers. The gas enters the pump chamber through the air inlet of the pump casing and starts the suction process. Since the pressure in the pump chamber of the pump casing is lower than the pressure of the external gas, the gas flows in rapidly and fills the chamber of the pump casing. As the rotor body 1, the outer ring shell 2 and the vane monomer 8 further rotate, the volume of the pump chamber of the pump casing begins to decrease, and the rotation of the rotor body 1 causes the contact surface between the vane monomer 8 and the pump casing to change. The gas is constantly changing and is compressed in the cavity. During this process, the double-spring sliding structure 7 ensures that the vane monomer 8 is always in close contact with the inner wall of the pump casing, providing stable contact pressure to prevent gas leakage. When the rotor body 1 continues to rotate to a certain angle, the compressed gas will reach the exhaust port. At this time, due to the combination of the design of the exhaust port and the gas flow path in the pump casing, the compressed gas will be discharged smoothly. After the exhaust is completed, the vane monomer 8 continues to rotate, and a low-pressure area is re-formed in the pump cavity, and external gas is inhaled again, so that the working state of the pump casing and pump cavity is constantly cycled between suction, compression and exhaust. Through the rotation of the rotor body 1, the outer ring shell 2 and the vane monomer 8, the gas processing capacity in the pump is sustained, ensuring the stability of the vacuum environment.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A rotary vane vacuum pump rotor structure, characterized in that: The invention comprises a rotor body (1) and an outer ring shell (2) bolted to the outer circumference of the rotor body (1); rectangular cutouts (5) are provided on both sides of the outer ring shell (2) and the rotor body (1); a concave cavity (6) is provided inside the rotor body (1) on one side of the rectangular cutout (5); a rotary vane unit (8) penetrating to the outside of the outer ring shell (2) is slidably installed inside the rectangular cutout (5); and a double spring sliding structure (7) for forcing the rotary vane unit (8) to always stay away from the central axis of the rotor body (1) is installed inside the concave cavity (6).

2. A rotary vane vacuum pump rotor structure according to claim 1, characterized in that: The outer ring shell (2) is made of alloy steel, and the surface of the outer ring shell (2) is smooth and free of burrs.

3. The rotary vane vacuum pump rotor structure according to claim 1, characterized in that: An eccentric hole (3) for fitting with a vacuum pump shaft is provided on one side of the surface of the rotor body (1), and a spline groove (301) is provided on the inner wall of the eccentric hole (3).

4. The rotary vane vacuum pump rotor structure according to claim 1, characterized in that: An annular inner edge (201) is provided on the inner wall of the outer ring shell (2), and a plurality of equally spaced convex portions (202) extending in the direction of the central axis of the rotor body (1) are provided on the inner wall of the annular inner edge (201). The outer peripheral surface of the rotor body (1) is integrally formed with a plurality of columnar protrusions (101) concentric with the convex portions (202). A positioning bolt (203) is installed on the outer wall of one side of the convex portion (202), and the threaded end of the positioning bolt (203) extends into the interior of the columnar protrusion (101).

5. The rotary vane vacuum pump rotor structure according to claim 3, characterized in that: A shaft sleeve (4) that is concentric with the rotor body (1) is provided on the outer wall of the rotor body (1) on one side of the eccentric hole (3).

6. The rotary vane vacuum pump rotor structure according to claim 1, characterized in that: The double-spring sliding structure (7) comprises two right-angled seats (701) installed inside the concave cavity (6), an inverted U-shaped slider (702) slidably installed between the two right-angled seats (701), and a coil spring (703) fixed inside the concave cavity (6), wherein the top end of the coil spring (703) is fixedly connected to the top wall of the inverted U-shaped slider (702).

7. The rotary vane vacuum pump rotor structure according to claim 6, characterized in that: A countersunk hole is provided inside the inverted U-shaped slider (702), and bolts for fixing the inverted U-shaped slider (702) and the rotary vane unit (8) are installed inside the countersunk hole.

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