Oil seal structure for vacuum pump

Abstract

The utility model discloses an oil seal structure for vacuum pump, including oil seal body, the oil seal body is annular structure, and the inner ring surface of oil seal body upper and lower two ends is provided with the slot, and the slot between upper and lower two ends is fixedly connected with the outer bracing sealing ring, and the inner surface of outer bracing sealing ring upper and lower two ends all is provided with the chamfer, and the upper and lower side of oil seal body is provided with fixed groove respectively, and the inside fixed connection of fixed groove has the pressure -resisting piece, and the outer ring surface middle part of oil seal body is provided with annular groove, and the oil seal inner ring side is the flexible rubber ring of with corresponding shaft interference fit, and flexible structure can prevent the assembly wear and tear of shaft and oil seal inner circle, can guarantee the leakproofness simultaneously, and the friction between the ball of outer ring and external cylinder is smaller, and extrudes the gland when moving, makes the gland and external cylinder close contact, makes oil seal leakproofness better, and modular design can be convenient for oil seal maintenance, avoids the waste of resources.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically to an oil seal structure for vacuum pumps. Background Technology

[0002] Oil seal is a common term for general sealing components; simply put, it's a seal for lubricating oil. It's a mechanical component used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to any liquid substance in general). It isolates the lubricated parts from the output parts in the transmission components, preventing lubricating oil leakage. Static seals and dynamic seals (generally reciprocating motion) are called oil seals.

[0003] When the oil seal of an existing rotary vane vacuum pump is fitted onto or removed from the shaft, the wear-resistant layer of the oil seal will be worn to varying degrees, which will easily lead to poor sealing performance of the oil seal and cause oil leakage in the rotary vane vacuum pump. Furthermore, the entire oil seal needs to be replaced during maintenance, which will result in waste of resources. To address this, we propose an oil seal structure for vacuum pumps. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide an oil seal structure for vacuum pumps. The inner ring of the oil seal is a flexible rubber ring that is interference-fitted with the corresponding shaft. The flexible structure can prevent assembly wear between the shaft and the inner ring of the oil seal, while ensuring sealing performance. The friction between the balls set on the outer ring and the external cylinder is small, and the pressure ring is squeezed during movement, so that the pressure ring is in close contact with the external cylinder, resulting in good oil seal sealing performance. The modular design can facilitate oil seal maintenance and avoid resource waste, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an oil seal structure for a vacuum pump, comprising an oil seal body, the oil seal body being an annular structure, with slots at both the upper and lower ends of the inner annular surface of the oil seal body, and an outer support sealing ring fixedly connected between the slots at both ends, the upper and lower ends of the inner surface of the outer support sealing ring being chamfered, fixed grooves being provided on the upper and lower sides of the oil seal body, and pressure-resistant plates being fixedly connected inside the fixed grooves, an annular groove being provided in the middle of the outer annular surface of the oil seal body, and ball grooves being provided in a circular array at both the upper and lower ends of the annular groove, with balls slidably connected inside the ball grooves, positioning rings being fixedly connected at both the upper and lower ends of the annular groove on the outer annular surface of the oil seal body, and limiting rings being slidably connected at both the upper and lower ends of the middle of the annular groove on the outer annular surface of the oil seal body, with arc-shaped grooves corresponding to the balls being provided on the opposite surfaces of the limiting rings and the positioning rings, and pressure rings being engaged between the limiting rings on both sides.

[0006] Furthermore, it also includes a rubber ring. Sealing grooves are respectively opened at the upper and lower ends of the outer ring surface of the oil seal body, and a rubber ring is fixedly connected inside the sealing groove. The outer surface of the rubber ring is flush with the outer surface of the pressure ring. The rubber ring can further improve the sealing performance between the outer ring of the oil seal and the external cylinder, thereby ensuring the sealing effect of the oil seal and making the use of the oil seal safer and more convenient.

[0007] Furthermore, both the rubber ring and the pressure ring are coated with a silicon carbide wear-resistant coating, and the outer edges and corners of the rubber ring and the pressure ring are rounded. The silicon carbide wear-resistant coating on the rubber ring and the pressure ring can prevent the rubber ring and the pressure ring from wearing out quickly, and the rounded corners can effectively prevent the oil seal from scratching the cylinder surface during operation, thus making the use of the oil seal safer.

[0008] Furthermore, both the outer support sealing ring and the pressure-resistant sheet are coated with an oleophobic layer, and both the outer support sealing ring and the pressure-resistant sheet are elastic structures. The oleophobic layer can effectively prevent oil from sticking to the surface of the outer support sealing ring and the pressure-resistant sheet, thus preventing the oil seal from being damaged due to insufficient cushioning when impacted. This makes the use of the oil seal safer.

[0009] Furthermore, the surfaces of the positioning ring, ball bearing, and limiting ring are all electroplated with a nickel alloy corrosion-resistant layer; the nickel alloy corrosion-resistant layer electroplated on the surfaces of the positioning ring, ball bearing, and limiting ring can extend their service life, thereby extending the service life of the oil seal.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The oil seal structure for this vacuum pump has the following advantages:

[0011] 1. The inner ring of the oil seal is a flexible rubber ring that is interference-fitted with the corresponding shaft. The flexible structure can prevent assembly wear between the shaft and the inner ring of the oil seal, while ensuring sealing performance. The friction between the balls on the outer ring and the external cylinder is small, and the pressure ring is squeezed during movement, making the pressure ring and the external cylinder in close contact, resulting in good oil seal sealing performance. The modular design can facilitate oil seal maintenance and avoid resource waste.

[0012] 2. The rubber ring further enhances the sealing between the outer ring of the oil seal and the outer cylinder, thereby ensuring the sealing effect of the oil seal and making its use safer and more convenient.

[0013] 3. The silicon carbide wear-resistant coating on the rubber ring and pressure ring surface can prevent the rubber ring and pressure ring from wearing out quickly, and the rounded corner structure at the edges can effectively prevent the oil seal from scratching the cylinder surface during operation, thus making the use of the oil seal safer. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0016] Figure 3 This is an enlarged structural schematic diagram of section A on the front side of this utility model.

[0017] In the diagram: 1. Oil seal body, 2. External support sealing ring, 3. Pressure resistant plate, 4. Pressure ring, 5. Positioning ring, 6. Ball bearing, 7. Limiting ring, 8. Rubber ring. Detailed Implementation

[0018] 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 protection scope of the present utility model.

[0019] Please see Figure 1-3 This embodiment provides a technical solution: an oil seal structure for a vacuum pump, including an oil seal body 1, which is an annular structure. The inner annular surface of the oil seal body 1 has slots at both ends, and an outer support sealing ring 2 is fixedly connected between the slots at both ends. The inner surface of the outer support sealing ring 2 has chamfers at both ends. The upper and lower sides of the oil seal body 1 have fixing slots, and pressure-resistant plates 3 are fixedly connected inside the fixing slots. The outer annular surface of the oil seal body 1 has an annular groove in the middle, and the upper and lower ends of the annular groove have ball grooves arranged in a circular array. Balls 6 are slidably connected inside the ball grooves. The upper and lower ends of the annular groove on the outer annular surface of the oil seal body 1 are fixedly connected to positioning rings 5, and the upper and lower ends of the annular groove on the outer annular surface of the oil seal body 1 are slidably connected to limiting rings 7. The opposite surfaces of the limiting rings 7 and the positioning rings 5 ​​have arc-shaped grooves corresponding to the balls 6. Pressure rings 4 are engaged between the limiting rings 7 on both sides.

[0020] In this embodiment, a rubber ring 8 is also included. Sealing grooves are respectively opened at the upper and lower ends of the outer ring surface of the oil seal body 1, and the rubber ring 8 is fixedly connected inside the sealing groove. The outer surface of the rubber ring 8 is flush with the outer surface of the pressure ring 4. The rubber ring 8 can further improve the sealing performance between the outer ring of the oil seal and the external cylinder, thereby ensuring the sealing effect of the oil seal and making the use of the oil seal safer and more convenient.

[0021] In this embodiment, both the rubber ring 8 and the pressure ring 4 are coated with a silicon carbide wear-resistant coating, and the outer corners of the rubber ring 8 and the pressure ring 4 are rounded. The silicon carbide wear-resistant coating on the rubber ring 8 and the pressure ring 4 can prevent the rubber ring 8 and the pressure ring 4 from wearing out quickly, and the rounded corners can effectively prevent the oil seal from scratching the cylinder surface during operation, thus making the use of the oil seal safer.

[0022] In this embodiment, the surfaces of the outer support sealing ring 2 and the pressure-resistant sheet 3 are both coated with an oleophobic layer, and both the outer support sealing ring 2 and the pressure-resistant sheet 3 are elastic structures. The oleophobic layer can effectively prevent oil from sticking to the surfaces of the outer support sealing ring 2 and the pressure-resistant sheet 3, thus affecting the normal use of the oil seal. The elastic structure of the pressure-resistant sheet 3 can prevent the oil seal from being damaged due to the inability to buffer impacts, thereby making the use of the oil seal safer.

[0023] In this embodiment, the surfaces of the positioning ring 5, the ball 6, and the limiting ring 7 are all electroplated with a nickel alloy corrosion-resistant layer; the nickel alloy corrosion-resistant layer electroplated on the surfaces of the positioning ring 5, the ball 6, and the limiting ring 7 can extend their service life, thereby extending the service life of the oil seal.

[0024] The working principle of the vacuum pump oil seal structure provided by this utility model is as follows: When assembling the oil seal, the ball bearing 6 is first installed into the corresponding ball bearing groove, and then the ball bearing 6 is limited by the limiting ring 7. Then, the pressure ring 4 is inserted between the limiting rings 7 on both sides to prevent the limiting rings 7 from moving and causing the ball bearing 6 to fall off. When installing the oil seal, the outer support sealing ring 2 is sleeved on the outer ring side of the outer shaft. When the oil seal moves, the ball bearing 6 reduces the friction between the oil seal and the outer cylinder. The outer surfaces of the pressure ring 4 and the rubber ring 8 are in close contact with the outer cylinder to ensure the sealing effect of the oil seal. When moving, the ball bearing 6 will squeeze the limiting ring 7, which in turn squeezes the pressure ring 4. After being squeezed, the pressure ring 4 deforms and expands outward, making the outer surface of the pressure ring 4 more closely contact the inner surface of the outer cylinder to improve the sealing effect. When the oil seal is damaged, it can be repaired by simply replacing the outer support sealing ring 2, the pressure ring 4, or the ball bearing 6.

[0025] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An oil seal structure for a vacuum pump, characterized in that: The system includes an oil seal body (1), which is an annular structure. The inner annular surface of the oil seal body (1) has grooves at both the upper and lower ends, and an outer support sealing ring (2) is fixedly connected between the grooves at both ends. The inner surface of the outer support sealing ring (2) has chamfers at both the upper and lower ends. The upper and lower sides of the oil seal body (1) are respectively provided with fixing grooves, and pressure-resistant plates (3) are fixedly connected inside the fixing grooves. An annular groove is provided in the middle of the outer annular surface of the oil seal body (1), and the upper and lower ends of the annular groove are respectively... The oil seal body (1) has a ball groove in a circular array. Balls (6) are slidably connected inside the ball groove. Positioning rings (5) are fixedly connected to the upper and lower ends of the annular groove on the outer ring surface of the oil seal body (1). Limiting rings (7) are slidably connected to the upper and lower ends of the middle part of the annular groove on the outer ring surface of the oil seal body (1). The opposite surfaces of the limiting rings (7) and the positioning rings (5) are respectively provided with arc-shaped grooves corresponding to the balls (6). Pressure rings (4) are engaged between the limiting rings (7) on both sides.

2. The oil seal structure for a vacuum pump according to claim 1, characterized in that: It also includes a rubber ring (8). The upper and lower ends of the outer ring surface of the oil seal body (1) are respectively provided with sealing grooves, and the rubber ring (8) is fixedly connected inside the sealing groove. The outer surface of the rubber ring (8) is flush with the outer surface of the pressure ring (4).

3. The oil seal structure for a vacuum pump according to claim 2, characterized in that: The surfaces of the rubber ring (8) and the pressure ring (4) are coated with a silicon carbide wear-resistant coating, and the outer corners of the rubber ring (8) and the pressure ring (4) are rounded.

4. The oil seal structure for a vacuum pump according to claim 1, characterized in that: The surfaces of the outer support sealing ring (2) and the pressure-resistant sheet (3) are coated with an oleophobic layer, and both the outer support sealing ring (2) and the pressure-resistant sheet (3) are elastic structures.

5. The oil seal structure for a vacuum pump according to claim 1, characterized in that: The surfaces of the positioning ring (5), the ball (6) and the limiting ring (7) are all electroplated with a nickel alloy corrosion-resistant layer.

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