Labyrinth seal structure applied to dry vacuum pump

Abstract

The utility model belongs to the field of sealing structures, and particularly relates to a labyrinth sealing structure applied to a dry vacuum pump, which comprises an end plate, a bearing arranged in a groove of the end plate, an oil retainer arranged on the lower portion of the bearing, a shaft in the middle of the end plate inserted into the middle of the bearing and the middle of the oil retainer, and a bent sealing portion arranged on the upper portion of the oil retainer. A second seal is arranged on the side portion of the oil retainer, a fourth seal is arranged on the lower portion of the oil retainer, and in the shaft operation process of the rotor in the middle of the end plate, most lubricating oil can be smoothly thrown back to a bearing under the dual effects of guiding of a slope arranged on the bent sealing portion of the oil retainer and centrifugal force generated by rotation, and therefore the lubricating oil is prevented from being damaged. And a small part of residual lubricating oil is blocked by a second sealing bending part structure and a third sealing bending part structure which are formed by matching the oil baffle ring with the end plate and is difficult to continuously leak outwards, and a fourth sealing bending part structure and a fifth sealing bending part structure are meshed with a groove in the bottom of the end plate to form a last defensive line, so that a good sealing effect is realized.

Description

Technical Field

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

[0002] In a dry screw vacuum pump, the working chambers of the driving and driven rotors are not lubricated during operation, but 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 rotor working chamber. In specific applications, the gas medium processed by the vacuum pump does not contain dust particles. When the vacuum pump is in operation, its rotor will rotate at high speed. At this time, the inner ring of the oil seal will make tight and uniform frictional contact with the rotor shaft, which can effectively prevent the lubricating oil in the bearing chamber from seeping into the rotor working chamber, thereby avoiding adverse effects on the vacuum level. Due to its wide applicability, the lip seal structure is widely used in various mechanical seal applications.

[0003] The working principle of lip seals mainly relies on the frictional contact between the soft plastic material used in its inner ring and the rotor shaft to achieve the sealing effect. To ensure stable and reliable sealing performance, it is particularly important to regularly disassemble and inspect the lip seal. However, the disassembly and assembly process inevitably causes unnecessary damage to the bearings and transmission gears that are closely matched with it. Therefore, a labyrinth seal structure for use in dry 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 labyrinth seal structure for use in dry vacuum pumps.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a labyrinth seal structure applied to a dry vacuum pump, including an end plate, a bearing is provided in the groove of the end plate, an oil baffle ring is provided at the lower part of the bearing, the shaft of the rotor in the middle of the end plate is inserted into the middle of the bearing and the oil baffle ring, a bent sealing part is provided at the upper part of the oil baffle ring, a second seal is provided at the side of the oil baffle ring, and a fourth seal is provided at the lower part of the oil baffle ring;

[0006] Preferably, the second seal further includes a third seal, and the third seal is provided at the lower part of the second seal;

[0007] Preferably, the fourth seal further includes a fifth seal, and the fifth seal is provided on the inner side of the fourth seal;

[0008] Preferably, the bend of the sealing part is designed as a 75-degree slope.

[0009] The advantages of this utility model are:

[0010] 1. During the operation of the rotor shaft in the middle of the end plate, most of the lubricating oil is smoothly thrown back to the bearing under the guidance of the ramp set in the bent sealing part of the oil baffle ring and the centrifugal force generated by the rotation. The remaining small part of the lubricating oil is difficult to continue to leak outward due to the obstruction of the second and third sealing bent parts structure formed by the oil baffle ring and the end plate. The fourth and fifth sealing bent structures mesh with the groove at the bottom of the end plate to form the last line of defense, thereby achieving a good sealing effect.

[0011] 2. The oil baffle ring design is suitable for vacuum pumps that remove gases containing a small amount of dust particles. During operation, the oil baffle ring rotates synchronously with the rotor shaft in the middle of the end plate, and an appropriate gap is reserved between it and the end plate. This avoids the wear problems caused by friction between parts in traditional sealing methods, and also eliminates the tedious operation of periodic disassembly, inspection and maintenance in subsequent work. In practical applications of equipment protective lubricating oil, this design not only improves the operating efficiency of the equipment, but also significantly reduces the damage that may be caused to bearings and gears during disassembly, extends the service life of key components of the equipment, and reduces the maintenance cost and downtime of the equipment. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a schematic cross-sectional view of the present invention installed in the bearing cavity;

[0014] Figure 2 This is a top-view three-dimensional structural diagram of the present invention;

[0015] Figure 3 This is a three-dimensional structural diagram of the present invention viewed from below.

[0016] In the picture:

[0017] 1. Oil baffle ring; 2. Bending seal; 3. Second seal; 31. Third seal; 4. Fourth seal; 41. Fifth seal; 6. End plate; 7. Bearing. 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 scope of protection of the present utility model.

[0019] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0020] This application discloses a labyrinth seal structure applied to a dry vacuum pump, including an end plate 6, a bearing 7 disposed in a groove of the end plate 6, an oil baffle ring 1 disposed at the lower part of the bearing 7, a shaft in the middle of the end plate 6 being inserted into the middle of the bearing 7 and the oil baffle ring 1, a bent sealing part 2 disposed at the upper part of the oil baffle ring 1, a second seal 3 disposed at the side of the oil baffle ring 1, and a fourth seal 4 disposed at the lower part of the oil baffle ring 1;

[0021] The second seal 3 also includes a third seal 31, and the third seal 31 is provided at the lower part of the second seal 3;

[0022] The fourth seal 4 also includes a fifth seal 41, and the fifth seal 41 is provided on the inner side of the fourth seal 4;

[0023] The inclined surface of the bent sealing part 2 is designed as a 75-degree slope.

[0024] Working Principle: In the mechanical structure of the bearing cavity, most of the lubricating oil seeps into the surrounding space from the rolling elements of the bearing. To effectively prevent lubricating oil leakage, the oil retainer ring 1 is designed with a 75-degree slope on its outward-facing side near the axis of the bearing 7. When the equipment is running, the oil retainer ring 1 rotates synchronously with the shaft of the rotor in the middle of the end plate 6. When the lubricating oil comes into contact with the rotating oil retainer ring 1, due to the slope structure of the bent sealing part 2 of the oil retainer ring 1 and the centrifugal force generated by the rotation, the lubricating oil is precisely thrown back into the interior of the bearing 7. From the perspective of fluid mechanics and sealing principles, the slope set by the bent sealing part 2 provides a clear guide for the flow of lubricating oil. The bent sealing part 2 constitutes the first seal in the oil retainer ring 1. From the overall structure... Structurally, the oil baffle ring 1 and the end plate 6 are combined with each other. The bending structure of the second seal 3 and the third seal 31 of the oil baffle ring 1 further forms a barrier against the lubricating oil, preventing a small portion of the lubricating oil from flowing out. During the operation of the rotor shaft in the middle of the end plate 6, most of the lubricating oil will be smoothly thrown back to the bearing under the guidance of the slope set in the bending seal part 2 of the oil baffle ring 1 and the centrifugal force generated by the rotation. The remaining small portion of lubricating oil will be blocked by the bending structure of the second seal 3 and the third seal 31 formed by the cooperation of the oil baffle ring 1 and the end plate 6, making it difficult for it to continue to leak outward. The bending structure of the fourth seal 4 and the fifth seal 41 meshes with the groove at the bottom of the end plate 6, forming the last line of defense, thereby achieving a good sealing effect.

[0025] This oil baffle ring 1 design is suitable for vacuum pumps that remove gases containing a small amount of dust particles. During operation, the oil baffle ring 1 rotates synchronously with the shaft of the rotor in the middle of the end plate 6, and an appropriate gap is reserved between it and the end plate 6. This avoids the wear problem caused by friction between parts in traditional sealing methods, and also eliminates the tedious operation of periodic disassembly, inspection and maintenance in subsequent work. In practical applications in equipment protective lubricating oil, this design not only improves the operating efficiency of the equipment, but also significantly reduces the damage that may be caused to bearings and gears during disassembly, extends the service life of key components of the equipment, and reduces the maintenance cost and downtime of the equipment.

[0026] 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 labyrinth seal structure for application on a dry vacuum pump, comprising an end plate (6), characterized in that: The groove of the end plate (6) is provided with a bearing (7), the lower part of the bearing (7) is provided with an oil screen ring (1), the shaft of the middle part of the end plate (6) is inserted into the middle part of the bearing (7) and the oil screen ring (1), the upper part of the oil screen ring (1) is provided with a bent sealing part (2), the side part of the oil screen ring (1) is provided with a second sealing (3), and the lower part of the oil screen ring (1) is provided with a fourth sealing (4).

2. A labyrinth seal structure for use in a dry vacuum pump according to claim 1, characterized in that: The second sealing (3) further comprises a third sealing (31), and the lower part of the second sealing (3) is provided with the third sealing (31).

3. The labyrinth seal structure for use in a dry vacuum pump according to claim 1, characterized in that: The fourth sealing (4) further comprises a fifth sealing (41), and the inner side of the fourth sealing (4) is provided with the fifth sealing (41).

4. The labyrinth seal structure for use in a dry vacuum pump according to claim 1, characterized in that: The slope of the bent sealing part (2) is designed as a 75-degree slope.

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