Double-layer lip-shaped sealing structure applied to vacuum pump

Abstract

The utility model belongs to the field of sealing structures, in particular to a double-layer lip-shaped sealing structure applied to a vacuum pump, which is characterized in that a bearing seat is arranged at the upper part of an end plate, a plurality of rotors are rotatably connected with holes of the bearing seat, the end plate is fixedly connected with a cover plate to form a closed space, and a shaft sleeve is sleeved at the end part of each rotor; the outer wall of the rotor is connected with the anti-seepage assembly in a sleeved mode, the air hole leads to a space formed between the upper lip-shaped seal and the lower lip-shaped seal, a reliable isolation barrier is additionally arranged between a working cavity of the rotor and a bearing cavity, airflow can form a specific air pressure environment in the space through the air hole, and lubricating media and impurities can be blocked. The arrangement of the anti-seepage assembly prevents the lubricating oil from entering a working medium of the lubricating cavity of the bearing seat to seriously damage the stability and lubricating performance of a lubricating oil film, prevents the bearing seat from being blocked to cause sudden shutdown of equipment and seriously influence the normal operation of the equipment, and prevents the bearing seat from being in a severe working environment due to long-term leakage of the lubricating oil.

Description

Technical Field

[0001] This utility model relates to the field of sealing structures, specifically a double-layer lip seal structure applied to vacuum pumps. Background Technology

[0002] A dry vacuum pump is a pumping device that uses a pair of rotors to generate suction and exhaust by rotating synchronously and at high speed in opposite directions within a pump casing. These rotors are driven by synchronous gears, and there is a certain clearance between the rotors. Therefore, the pump operates without friction, resulting in smooth operation and low noise. The working chamber does not require lubrication. While the working chamber of the dry vacuum pump's driving and driven rotors is not lubricated during operation, the bearings and synchronous gears on both sides still require lubrication. Therefore, a sealing structure must be installed between the working chamber and the bearing chamber to prevent the lubricating oil from communicating with the working chamber. Traditional methods include piston rings and lip seals. Piston ring seals consist of 4 to 6 piston rings fitted onto a shaft sleeve, which rotates synchronously with the shaft. The piston rings are installed in the grooves of the shaft sleeve and snapped together, forming a ring. The piston rings themselves are made of wear-resistant material, and as the shaft rotates, the piston rings rub against the inner wall, thus isolating the working chamber from the bearing chamber.

[0003] Under specific operating conditions, piston ring structures are susceptible to failure. When the piston reciprocates in the working chamber, at certain moments, the medium in the working chamber (such as high-pressure gas or high-temperature liquid) may breach the piston ring seal and leak into the bearing lubrication chamber through the tiny gap between the piston ring and the cylinder wall. This leakage is extremely harmful. The working medium entering the bearing lubrication chamber severely damages the stability and lubrication performance of the lubricating oil film. On the one hand, it leads to a sharp increase in the bearing's friction coefficient, causing the bearing to seize and resulting in sudden equipment shutdown, seriously affecting the normal operation of the equipment. On the other hand, long-term leakage will also expose the bearing to a harsh working environment, accelerating the wear and fatigue of bearing components and significantly shortening the bearing's service life. Therefore, a double-lip seal structure for use in vacuum pumps is proposed to address the above problems. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model proposes a double-layer lip seal structure for use in vacuum pumps.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a double-layer lip seal structure applied to a vacuum pump, including an end plate, a bearing seat provided on the upper part of the end plate, a plurality of rotors rotatably connected to the hole of the bearing seat, a cover plate fixedly connected to the end plate to form a sealed space, a bushing sleeve provided at the end of the rotor, and a liquid-proof component provided on the outer wall of the rotor.

[0006] Preferably, the side of the end plate is provided with air holes, which are connected to the gaps of the anti-seepage liquid component.

[0007] Preferably, the anti-seepage component further includes: an upper lip seal and a lower lip seal, wherein the outer ring of the upper lip seal is installed at the end groove of the bearing housing, and the outer ring of the lower lip seal is installed at the groove on the inner wall of the end plate.

[0008] Preferably, a dust cover is provided between the upper lip seal and the lower lip seal to isolate the two, and the dust cover is snapped into a groove on the inner wall of the end plate;

[0009] Preferably, the upper lip seal and the lower lip seal are arranged in opposite directions.

[0010] The advantages of this utility model are:

[0011] 1. This utility model adds an extra reliable isolation barrier between the rotor working chamber and the bearing chamber by opening an air hole on the end plate, which leads to the space formed between the upper lip seal and the lower lip seal. When the system is running, the airflow can form a specific air pressure environment in the space through the air hole, further enhancing the barrier against lubricating media and impurities.

[0012] 2. By leveraging the structural characteristics of the bearing housing, an independent mechanical anti-seepage component can be added, which can more effectively isolate the rotor working chamber from the bearing cavity. This isolation method can significantly improve the sealing performance, reduce the risk of medium leakage from the rotor working chamber to the bearing cavity, reduce the impact of the lubricating medium in the bearing cavity on the anti-seepage component, and thus provide a more stable and reliable working environment for the bearing housing, ensuring the efficient and stable operation of the equipment.

[0013] 3. The anti-seepage component prevents lubricating oil from entering the bearing housing lubrication cavity. Working media can severely damage the stability and lubrication performance of the lubricating oil film, prevent bearing housing jamming, and avoid sudden equipment shutdown, which can seriously affect the normal operation of the equipment. On the other hand, preventing long-term lubricating oil leakage will also put the bearing housing in a harsh working environment, accelerate the wear and fatigue of bearing housing components, and significantly shorten the service life of the bearing housing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1This is a three-dimensional structural diagram of the bearing cavity of this utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the bearing cavity of this utility model.

[0017] In the picture:

[0018] 1. End plate; 2. Bearing housing; 3. Rotor; 11. Cover plate; 4. Shaft sleeve; 6. Leakage prevention assembly; 61. Upper lip seal; 62. Lower lip seal; 7. Dust cover; 8. Air hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0021] This application discloses a double-layer lip seal structure applied to a vacuum pump, including an end plate 1, a bearing seat 2 provided on the upper part of the end plate 1, a plurality of rotors 3 rotatably connected to the hole of the bearing seat 2, a cover plate 11 fixedly connected to the end plate 1 to form a sealed space, a bushing 4 sleeved at the end of the rotor 3, and a liquid-proof component 6 sleeved and connected to the outer wall of the rotor 3.

[0022] The side of the end plate 1 is provided with an air hole 8, which is connected to the gap of the anti-seepage liquid component 6.

[0023] The anti-seepage component 6 further includes: an upper lip seal 61 and a lower lip seal 62. The outer ring of the upper lip seal 61 is installed at the end groove of the bearing seat 2, and the outer ring of the lower lip seal 62 is installed at the groove on the inner wall of the end plate 1.

[0024] A dust cover 7 is provided between the upper lip seal 61 and the lower lip seal 62 to isolate the two. The dust cover 7 is snapped into the groove on the inner wall of the end plate 1.

[0025] The upper lip seal 61 and the lower lip seal 62 are arranged in opposite directions.

[0026] Working principle: The upper lip seal 61 and the lower lip seal 62 work together. The inner rings of the two lip seals are tightly installed on the bushing 4, with a dust cover 7 in between as a spacer. The outer rings of the two lip seals are installed in different positions: the outer ring of the lower lip seal 62 is installed at the end plate 1, while the upper lip seal 61 is installed at the end of the bearing housing 2. This ensures that there is no direct contact between the upper lip seal 61 and the lower lip seal 62, and they are also in a non-contact state with the dust cover 7 on the bushing 4. At the same time, a certain distance is maintained between the upper lip seal 61 and the lower lip seal 62, forming an effective isolation area between the bearing cavity and the rotor cavity.

[0027] The upper lip seal 61 and the lower lip seal 62 are installed in opposite directions. Specifically, the upper lip seal 61 installed on the bearing housing 2 can effectively prevent the lubricating medium in the bearing cavity from seeping into the rotor cavity due to various working conditions, thereby reducing the impact of the lubricating medium on the anti-seepage component 6 and avoiding interference with the operation of the components in the rotor cavity. The lower lip seal 62 installed on the end plate 1 effectively isolates the gas and impurities in the rotor cavity, ensuring the sealed state of the rotor cavity and preventing impurities from spreading to other critical parts, thus ensuring the stable operation of the system.

[0028] Furthermore, to further enhance the isolation effect, an air hole 8 is provided on the end plate 1. This air hole 8 leads to the space formed between the upper lip seal 61 and the lower lip seal 62, adding an extra reliable isolation barrier between the rotor working chamber and the bearing chamber. When the system is running, the airflow can form a specific air pressure environment in this space through the air hole 8, further enhancing the barrier against lubricating media and impurities. Compared with traditional sealing methods, the synergistic effect of the upper lip seal 61 and the lower lip seal 62, as well as the layout of the dust cover 7 and the air hole 8, greatly improves the reliability and effectiveness of the seal, better meeting the stringent requirements for system sealing and stability under complex working conditions, and providing a solid guarantee for the long-term stable operation of the mechanical system.

[0029] By leveraging the structural characteristics of bearing housing 2, an independent mechanical anti-seepage component 6 is added, which can more effectively isolate the working chamber of rotor 3 from the bearing cavity. This isolation method can significantly improve sealing performance, reduce the risk of medium leakage from the working chamber of rotor 3 to the bearing cavity, reduce the impact of lubricating medium in the bearing cavity on the anti-seepage component 6, and thus provide a more stable and reliable working environment for bearing housing 2, ensuring the efficient and stable operation of the equipment.

[0030] The anti-seepage component 6 prevents lubricating oil from entering the lubrication chamber of bearing housing 2. Working medium can severely damage the stability and lubrication performance of the lubricating oil film, prevent bearing housing 2 from jamming and causing sudden equipment shutdown, which would seriously affect the normal operation of the equipment. On the other hand, it also prevents long-term leakage of lubricating oil from placing bearing housing 2 in a harsh working environment, accelerating the wear and fatigue of bearing housing 2 components, and significantly shortening the service life of bearing housing 2.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A double-lip seal structure for use in vacuum pumps, comprising an end plate (1), characterized in that: The upper part of the end plate (1) is provided with a bearing seat (2), and a plurality of rotors (3) are rotatably connected to the hole of the bearing seat (2). The end plate (1) is fixedly connected to the cover plate (11) to form a sealed space. The end of the rotor (3) is fitted with a bushing (4), and the outer wall of the rotor (3) is fitted with a liquid-proof component (6). The end plate (1) has air holes (8) on its side, and the air holes (8) are connected to the gap of the anti-seepage liquid component (6). The anti-seepage component (6) further includes: an upper lip seal (61) and a lower lip seal (62). The outer ring of the upper lip seal (61) is installed at the end groove of the bushing (4), and the outer ring of the lower lip seal (62) is installed at the groove on the inner wall of the end plate (1).

2. The double-layer lip seal structure applied to a vacuum pump according to claim 1, characterized in that: A dust cover (7) is provided between the upper lip seal (61) and the lower lip seal (62) to isolate the two. The dust cover (7) is snapped into the groove on the inner wall of the end plate (1).

3. The double-layer lip seal structure applied to a vacuum pump according to claim 2, characterized in that: The upper lip seal (61) and the lower lip seal (62) are arranged in opposite directions.

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