Shaft end sealing mechanism of dry type screw vacuum pump

Abstract

The utility model provides a shaft end sealing mechanism of a dry type screw vacuum pump, which relates to the technical field of dry type screw vacuum pumps, and comprises a shell and two cover plates, the inner surface of the shell is symmetrically provided with two rotating shafts, the outer surfaces of the two rotating shafts are fixedly connected with shaft sleeves, and the shaft sleeves are fixedly connected with the cover plates. A plurality of telescopic rods are fixedly connected to the front surface of the shaft sleeve at equal intervals. According to the utility model, the spring, the shaft sleeve, the dynamic sealing ring and the static sealing ring are matched for use, so that the shaft end of the rotating shaft can be sealed, and meanwhile, the normal deformation of the spring in the working process can be ensured under the assistance of the telescopic rod, so that the protective sleeve can protect the internal spring and the telescopic rod; direct contact between the spring and the external environment is reduced, abrasion caused by friction or collision is reduced, the spring is prevented from being directly eroded by corrosive media, the service life of the spring is prolonged, and the durability of the sealing performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dry screw vacuum pumps, in particular to a shaft end sealing mechanism for a dry screw vacuum pump. Background Technique

[0002] A dry screw vacuum pump is a gas extraction device that uses a pair of screws to rotate synchronously and at high speed in opposite directions in a pump casing to generate suction and exhaust effects. It can extract gas in occasions containing a large amount of water vapor and a small amount of dust, has a higher ultimate vacuum, consumes less power, and has advantages such as energy saving and maintenance-free. The main and driven screws are supported by bearings and achieve synchronous reverse rotation through gear transmission. Therefore, there are four parts that need to be sealed to prevent mutual contamination between the pump cavity and the media on both sides, causing corrosion of components.

[0003] In the prior art, the shaft end of a dry screw vacuum pump is usually sealed by mechanical seals to ensure tightness. However, during use, the internal spring usually comes into direct contact with the external environment. When in a humid or corrosive working environment, it will face the risk of direct corrosion, resulting in spring failure and affecting the sealing effect. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problem that in the prior art, the shaft end of a dry screw vacuum pump is usually sealed by mechanical seals to ensure tightness. However, during use, the internal spring usually comes into direct contact with the external environment. When in a humid or corrosive working environment, it will face the risk of direct corrosion, resulting in spring failure and affecting the sealing effect, and to propose a shaft end sealing mechanism for a dry screw vacuum pump.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A shaft end sealing mechanism for a dry screw vacuum pump, including: a housing and two cover plates. Two rotating shafts are symmetrically arranged on the inner surface of the housing. Shaft sleeves are fixedly connected to the outer surfaces of the two rotating shafts. A plurality of telescopic rods are equidistantly fixedly connected to the front surface of the shaft sleeve. The front end surfaces of the plurality of telescopic rods are fixedly connected with an installation ring. Springs are sleeved on the outer surfaces of the plurality of telescopic rods. Protective sleeves are sleeved on the outer surfaces of the plurality of springs. A dynamic sealing ring is fixedly connected to the inner surface of the installation ring. Installation sleeves are symmetrically connected to the inner surfaces of the two cover plates. Static sealing rings are fixedly connected to the rear end surfaces of the two installation sleeves.

[0006] Preferably, the dynamic sealing ring and the static sealing ring are provided in a matching manner. Sealing grooves are symmetrically and fixedly connected to the inner wall of the shaft sleeve. Rubber rings are fixedly connected to the inner surfaces of the two sealing grooves.

[0007] Preferably, positioning rods are symmetrically and fixedly connected to the rear end faces of the two cover plates, and a plurality of positioning holes are fixedly connected to the front surface of the housing. The plurality of positioning rods and the plurality of positioning holes are provided in a matching manner.

[0008] Preferably, the front surface of the housing is provided with an installation groove in a split manner, and rubber pads are fixedly connected to the inner surfaces of the two installation grooves.

[0009] Preferably, one ends of the plurality of springs are fixedly connected to the rear end face of the installation ring, and the other end faces of the plurality of springs are fixedly connected to the front end face of the shaft sleeve.

[0010] Preferably, one ends of the plurality of protective sleeves are fixedly connected to the rear end face of the installation ring, and the other end faces of the plurality of protective sleeves are fixedly connected to the front end face of the shaft sleeve.

[0011] Preferably, the housing and the two cover plates are connected by bolts.

[0012] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0013] 1. In the present utility model, through the combined use of springs, shaft sleeves, dynamic sealing rings and static sealing rings, the shaft end of the rotating shaft can be sealed. At the same time, with the assistance of the telescopic rod, the normal deformation of the spring during operation can be ensured. Thus, the protective sleeve can protect the internal spring and telescopic rod, reduce the direct contact between the spring and the external environment, reduce wear caused by friction or collision, prevent corrosive media from directly eroding the spring, extend the service life of the spring, and improve the durability of the sealing performance.

[0014] 2. In the present utility model, through the combined use of the cover plate, positioning rod, positioning groove, rubber pad and installation groove, the installation and disassembly of the cover plate are convenient, and the sealing performance after installation is ensured, which is convenient for subsequent maintenance and has high practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective view of a shaft end sealing mechanism of a dry screw vacuum pump proposed by the present utility model;

[0016] Figure 2 is a partial structural sectional view of a shaft end sealing mechanism of a dry screw vacuum pump proposed by the present utility model;

[0017] Figure 3 is an exploded view of a shaft end sealing mechanism of a dry screw vacuum pump proposed by the present utility model;

[0018] Figure 4 is a developed view of a shaft end sealing mechanism of a dry screw vacuum pump proposed by the present utility model;

[0019] Figure 5The figure is a schematic structural view of a cover plate of a shaft end sealing mechanism of a dry screw vacuum pump proposed by the present utility model.

[0020] Legend: 1. Outer shell; 2. Cover plate; 3. Sleeve; 4. Mounting sleeve; 5. Rotating shaft; 6. Mounting groove; 7. Positioning hole; 8. Rubber pad; 9. Mounting ring; 10. Protective sleeve; 11. Dynamic sealing ring; 12. Sealing groove; 13. Telescopic rod; 14. Spring; 15. Positioning rod; 16. Rubber ring; 17. Static sealing ring. Detailed implementation manners

[0021] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0022] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the limitations of the specific embodiments disclosed in the following specification.

[0023] Embodiment 1, as Figures 1-5 shown, the present utility model provides a shaft end sealing mechanism of a dry screw vacuum pump, including: an outer shell 1 and two cover plates 2. Two rotating shafts 5 are symmetrically arranged on the inner surface of the outer shell 1. Sleeve 3 is fixedly connected to the outer surfaces of the two rotating shafts 5. A plurality of telescopic rods 13 are fixedly connected to the front surfaces of the sleeves 3 at equal intervals. The front end surfaces of the plurality of telescopic rods 13 are fixedly connected to a mounting ring 9. Springs 14 are sleeved on the outer surfaces of the plurality of telescopic rods 13. Protective sleeves 10 are sleeved on the outer surfaces of the plurality of springs 14. A dynamic sealing ring 11 is fixedly connected to the inner surface of the mounting ring 9. Mounting sleeves 4 are symmetrically connected to the inner surfaces of the two cover plates 2. Static sealing rings 17 are fixedly connected to the rear end surfaces of the two mounting sleeves 4. The dynamic sealing ring 11 and the static sealing ring 17 are provided in a matching manner. Sealing grooves 12 are symmetrically and fixedly connected to the inner walls of the sleeves 3. Rubber rings 16 are fixedly connected to the inner surfaces of the two sealing grooves 12. One ends of the plurality of springs 14 are fixedly connected to the rear end surfaces of the mounting ring 9. The other end surfaces of the plurality of springs 14 are fixedly connected to the front end surfaces of the sleeves 3. One ends of the plurality of protective sleeves 10 are fixedly connected to the rear end surfaces of the mounting ring 9. The other end surfaces of the plurality of protective sleeves 10 are fixedly connected to the front end surfaces of the sleeves 3.

[0024] The effect achieved by the entire Embodiment 1 is that the configurations on the two bushings 3 are the same. When the bushing 3 is installed and connected to the rotating shaft 5, the internal sealing groove 12 and the rubber ring 16 are used in combination to fill the gap between the bushing 3 and the rotating shaft 5, ensuring the sealing of the connection. Thus, when the rotating shaft 5 rotates, it will drive the bushing 3 to rotate. During rotation, under the action of the elastic force of the spring 14, the mounting ring 9 will be driven to move forward, making the end face of the dynamic sealing ring 11 closely fit with the end face of the static sealing ring 17, forming a very small axial gap, achieving the sealing of the shaft end of the rotating shaft 5. Through the telescopic rod 13 inside the spring 14, the compression and extension of the spring 14 can be restricted, ensuring the normal deformation of the spring 14 during operation. At the same time, the protective sleeve 10 is made of corrosion-resistant rubber and can deform following the change of the spring 14. Thus, the internal spring 14 and telescopic rod 13 can be protected by the protective sleeve 10, reducing the direct contact between the spring 14 and the external environment, reducing wear caused by friction or collision, preventing corrosive media from directly eroding the spring 14, extending the service life of the spring 14, and improving the durability of the sealing performance.

[0025] Embodiment 2, as Figures 1-5 shown, the rear end faces of the two cover plates 2 are symmetrically and fixedly connected with positioning rods 15. The front surface of the housing 1 is fixedly connected with a plurality of positioning holes 7. The plurality of positioning rods 15 and the plurality of positioning holes 7 are arranged in a matching manner. The front surface of the housing 1 is provided with an installation groove 6 in a split manner. The inner surfaces of the two installation grooves 6 are fixedly connected with rubber pads 8. The housing 1 and the two cover plates 2 are connected by bolts.

[0026] The effect achieved by the entire Embodiment 2 is that when it is necessary to replace the dynamic sealing ring 11 and the static sealing ring 17, the bolts on the cover plate 2 are unscrewed and the cover plate 2 is removed, and then the replacement can be carried out. When installing the cover plate 2, the two positioning rods 15 are inserted into the corresponding positioning holes 7 in sequence, so that the threaded holes on the cover plate 2 and the threaded holes on the housing 1 are quickly aligned, and then fixed by bolts. After the fixing is completed, under the action of the installation groove 6 and the rubber pad 8, the seal between the cover plate 2 and the housing 1 is filled, ensuring the sealing performance after installation. The disassembly and assembly are convenient, facilitating subsequent maintenance, and having high practicality.

[0027] Working principle: When the rotating shaft 5 rotates, it will drive the sleeve 3 to rotate. During the rotation, under the action of the elastic force of the spring 14, the mounting ring 9 will be driven to move forward, so that the end face of the dynamic sealing ring 11 is in close contact with the end face of the static sealing ring 17, forming a very small axial clearance, achieving the sealing of the shaft end of the rotating shaft 5. Through the telescopic rod 13 inside the spring 14, the compression and extension of the spring 14 can be restricted, ensuring the normal deformation of the spring 14 during operation. At the same time, the protective sleeve 10 is made of corrosion-resistant rubber and can deform following the change of the spring 14. Thus, the internal spring 14 and telescopic rod 13 can be protected by the protective sleeve 10, prolonging the service life of the spring 14 and improving the durability of the sealing performance. When it is necessary to replace the dynamic sealing ring 11 and the static sealing ring 17, unscrew the bolts on the cover plate 2 and remove the cover plate 2 to perform the replacement. When installing the cover plate 2, insert the two positioning rods 15 into the corresponding positioning holes 7 in sequence, so that the threaded holes on the cover plate 2 and the threaded holes on the housing 1 are quickly aligned, and then fix them with bolts. After the fixation, under the action of the installation groove 6 and the rubber pad 8, the seal between the cover plate 2 and the housing 1 is filled to ensure the sealing performance after installation. The disassembly and assembly are convenient, facilitating subsequent maintenance, and the practicability is relatively high.

[0028] The above is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A dry screw vacuum pump shaft end sealing mechanism, characterized in that: include: A shell (1) and two cover plates (2), wherein two rotating shafts (5) are symmetrically arranged on the inner surface of the shell (1), the outer surfaces of the two rotating shafts (5) are fixedly connected to shaft sleeves (3), the front surfaces of the shaft sleeves (3) are fixedly connected to a plurality of telescopic rods (13) at equal intervals, the front end surfaces of the plurality of telescopic rods (13) are fixedly connected to mounting rings (9), the outer surfaces of the plurality of telescopic rods (13) are sleeved with springs (14), the outer surfaces of the plurality of springs (14) are sleeved with protective sleeves (10), the inner surface of the mounting ring (9) is fixedly connected to a dynamic sealing ring (11), the inner surfaces of the two cover plates (2) are symmetrically connected to mounting sleeves (4), and the rear end surfaces of the two mounting sleeves (4) are fixedly connected to static sealing rings (17).

2. The dry screw vacuum pump shaft end sealing mechanism according to claim 1, characterized in that: The dynamic sealing ring (11) and the static sealing ring (17) are arranged in a matching manner, the inner wall of the shaft sleeve (3) is symmetrically fixedly connected with a sealing groove (12), and the inner surfaces of the two sealing grooves (12) are fixedly connected with a rubber ring (16).

3. The shaft end sealing mechanism of the dry screw vacuum pump according to claim 2, characterized in that: The rear end surfaces of the two cover plates (2) are symmetrically fixedly connected with positioning rods (15), the front surface of the housing (1) is fixedly connected with a plurality of positioning holes (7), and the plurality of positioning rods (15) are respectively matched with the plurality of positioning holes (7).

4. The dry screw vacuum pump shaft end sealing mechanism according to claim 3, characterized in that: The front surface of the housing (1) is provided with mounting grooves (6), and the inner surfaces of the two mounting grooves (6) are fixedly connected with rubber pads (8).

5. The shaft end sealing mechanism of the dry screw vacuum pump according to claim 4, characterized in that: One end of each of the plurality of springs (14) is fixedly connected to the rear end face of the mounting ring (9), and the other end faces of each of the plurality of springs (14) are fixedly connected to the front end face of the shaft sleeve (3).

6. The shaft end sealing mechanism of the dry screw vacuum pump according to claim 5, characterized in that: One end of each of the plurality of protective sleeves (10) is fixedly connected to the rear end face of the mounting ring (9), and the other end faces of each of the plurality of protective sleeves (10) are fixedly connected to the front end face of the shaft sleeve (3).

7. The dry screw vacuum pump shaft end sealing mechanism according to claim 6, characterized in that: The housing (1) is connected to the two cover plates (2) via bolts.

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