Multiple leakage-proof labyrinth seal structure

Abstract

The utility model discloses a multiple leakproof labyrinth seal structure, which belongs to the technical field of mechanical seal, and comprises a seal shaft sleeve, a seal shaft sleeve and a seal shaft sleeve, the labyrinth sealing teeth are arranged on the inner hole of the sealing shaft sleeve and are uniformly distributed in the axial direction of the sealing shaft sleeve, and an annular oil groove is formed between every two adjacent labyrinth sealing teeth; the U-shaped oil return groove penetrates through and is communicated with part or all of the annular oil groove; and the oil return holes are distributed in the two sides of the oil return groove, and the annular oil grooves are communicated through the oil return holes respectively, so that safe sealing of lubrication is achieved, and the aim of changing the occasional leakage phenomenon of an existing labyrinth seal is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical seals, and in particular relates to a multiple anti-leakage labyrinth seal structure. Background Art

[0002] In rotating equipment, bearing boxes generally use lubricating oil to lubricate and cool bearings, and lubricating oil seals are used for bearing boxes. Oil seals, labyrinth seals and combined bearing isolators are the most common. Among them, oil seals are standard parts, and oil seals are contact structures. There are wear on the shaft and restrictions on the use environment, but the assembly and use level of the manufacturer is not high; labyrinth seals are processed parts and labyrinth seals are non-contact sealing structures. They have good sealing effects and will not cause wear on the shaft. At the same time, labyrinth seals also have the characteristics of low cost and easy processing, and thus are widely and extensively used; combined bearing isolators are also non-contact structures and have good sealing effects, but are subject to factors such as complex manufacturing and assembly processes, high costs, and a narrow market, and are mainly used in environments such as petroleum, petrochemicals, and coal chemical industries that have particularly high requirements for the operating environment.

[0003] For the labyrinth seals that are widely used in the market, their common structure is mainly a multi-tooth plus oil return hole structure. Due to the overly simple structure, when too much lubricating oil is returned, the oil return is not smooth, and it leaks outward from the labyrinth along the shaft. At this stage, it is necessary to optimize a more reliable sealing structure to meet the safe sealing of lubrication. Utility Model Content

[0004] In view of this, in order to solve the above problems existing in the prior art, the purpose of the utility model is to provide a multiple anti-leakage labyrinth seal structure to achieve a safe seal for lubrication, thereby changing the occasional leakage phenomenon of the current labyrinth seal.

[0005] The technical solution adopted by the utility model is: a multiple anti-leakage labyrinth sealing structure, the sealing structure comprises:

[0006] Sealing sleeve;

[0007] A plurality of ring-shaped labyrinth seal teeth, each of which is arranged on the inner hole of the sealing sleeve and is evenly distributed along the axial direction of the sealing sleeve, and an annular oil groove is formed between two adjacent labyrinth seal teeth;

[0008] A U-shaped oil return groove, the oil return groove runs through and connects part or all of the annular oil groove;

[0009] The oil return holes are distributed on both sides of the oil return groove, and the annular oil grooves are connected through the oil return holes.

[0010] Furthermore, the number of teeth of the labyrinth seal teeth is greater than or equal to 4 teeth.

[0011] Further, if the shaft diameter corresponding to the sealing sleeve is ≤30mm, the number of teeth of the labyrinth seal teeth is 4; if the shaft diameter corresponding to the sealing sleeve is >30mm and ≤80mm, the number of teeth of the labyrinth seal teeth is 5; if the shaft diameter corresponding to the sealing sleeve is >80 and ≤120mm, the number of teeth of the labyrinth seal teeth is 6; if the shaft diameter corresponding to the sealing sleeve is >120mm, the number of teeth of the labyrinth seal teeth is 7.

[0012] Furthermore, the dimensional relationship among the tooth width B, tooth height h, and oil groove width b of the labyrinth seal tooth is: 3.0Bmm>h≥2.2Bmm; 2.0Bmm>b≥1.5Bmm; 2.5mm>B≥1.5mm.

[0013] Furthermore, the diameter of the oil return groove is Φ1, and 5mm≤Φ1≤8mm.

[0014] Furthermore, the diameter of the oil return hole is Φ2, and 5mm≤Φ2≤8mm.

[0015] The beneficial effects of the utility model are:

[0016] 1. Based on the multiple anti-leakage labyrinth seal structure provided by the utility model, the oil return hole is designed to return the lubricating oil gathered in the labyrinth seal teeth into the bearing box; the U-shaped oil return groove is designed to form a pressure channel when the equipment is running, so as to avoid the formation of negative pressure inside the labyrinth seal, which causes the lubrication to not be affected by atmospheric pressure and flow to a low point. During operation, the risk of axial leakage of the labyrinth seal is reduced, and the leakage of lubricating oil and environmental pollution are avoided. At the same time, the non-contact labyrinth seal can avoid wear and damage to the shaft, and the manufacturing and processing process of the labyrinth seal structure is easy to implement, the material cost is low, it is widely used in the industry, the application volume is large, and it is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the multiple anti-leakage labyrinth sealing structure provided by the utility model;

[0018] Figure 2 It is a schematic diagram of the multiple anti-leakage labyrinth sealing structure provided by the utility model from another perspective;

[0019] Figure 3 It is a front view schematic diagram of the multiple anti-leakage labyrinth sealing structure provided by the utility model;

[0020] Figure 4 It is a schematic cross-sectional view in the direction of AA of the multi-leakage-proof labyrinth seal structure provided by the utility model;

[0021] Figure 5It is a BB-direction cross-sectional schematic diagram of the multiple anti-leakage labyrinth sealing structure provided by the utility model;

[0022] The following are the descriptions of the reference numerals:

[0023] 1- Sealing sleeve; 2- Labyrinth sealing teeth; 3- Oil return groove; 4- Oil return hole. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0027] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, not all of the embodiments. The components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Example 1

[0029] In order to solve the technical problem of labyrinth seal lubricating oil leakage along the shaft, this embodiment specifically provides a multiple anti-leakage labyrinth seal structure, which includes: a sealing sleeve 1, which is assembled on the rotating shaft and plays the role of a mechanical seal.

[0030] like Figure 1-Figure 5 As shown, a plurality of ring-shaped labyrinth sealing teeth 2 are arranged on the inner hole of the sealing sleeve 1, each of the labyrinth sealing teeth 2 is arranged in the axial direction of the sealing sleeve 1, and each of the labyrinth sealing teeth 2 is evenly distributed. At the same time, an annular oil groove is formed between two adjacent labyrinth sealing teeth 2, and the width of the annular oil groove is the axial spacing between the two labyrinth sealing teeth 2.

[0031] A U-shaped oil return groove 3 is provided on the inner hole of the sealing sleeve 1, and the oil return groove 3 penetrates and connects part or all of the annular oil grooves; taking the figure as an example, four labyrinth seal teeth 2 are provided on the inner hole of the sealing sleeve 1, and the four labyrinth seal teeth 2 form four annular oil grooves, and the three annular oil grooves on the same side are connected through the oil return groove 3. By designing the U-shaped oil return groove 3, it can form a pressure channel when the equipment is running, avoiding the formation of negative pressure inside the labyrinth seal, resulting in the phenomenon that the lubrication cannot be affected by atmospheric pressure and flows to a lower point.

[0032] A plurality of oil return holes 4 are distributed on both sides of the oil return groove 3, and the annular oil grooves are connected through the oil return holes 4. The purpose of designing the oil return holes 4 on both sides is to return the lubricating oil collected in the labyrinth seal teeth 2 into the bearing box.

[0033] Based on the above structure, by controlling the number of labyrinth seal teeth 2, optimizing the structural shape of the teeth, and improving the type of oil return, the lubricating oil return structure can be realized to the maximum extent. In this embodiment, the number of teeth, the shape of the teeth, and the type of the oil return hole 4 in the labyrinth seal structure are designed as follows:

[0034] In this embodiment, taking the shaft diameter of the sealing sleeve 1 as ≤30 mm as an example, the number of teeth of the labyrinth seal teeth 2 is 4.

[0035] Since the tooth width B, tooth height h, and oil groove width b of the labyrinth seal tooth 2 have a dimensional relationship of: 3.0Bmm>h≥2.2Bmm; 2.0Bmm>b≥1.5Bmm; 2.5mm>B≥1.5mm. In this embodiment, B=1.5mm, b=2.8mm, and h=3.75mm are set. At the same time, the diameter of the oil return groove 3 is selected to be Φ1=5mm; the diameter of the oil return hole 4 is selected to be Φ2=5mm.

[0036] Example 2

[0037] In this embodiment, taking the shaft diameter corresponding to the sealing sleeve 1 as being between 30 mm and 80 mm as an example, the number of teeth of the labyrinth seal teeth 2 is 5.

[0038] Since the tooth width B, tooth height h, and oil groove width b of the labyrinth seal tooth 2 have a dimensional relationship of: 3.0Bmm>h≥2.2Bmm; 2.0Bmm>b≥1.5Bmm; 2.5mm>B≥1.5mm. In this embodiment, B=2mm, b=3.8mm, and h=5mm are set. At the same time, the diameter of the oil return groove 3 is selected to be Φ1=6mm; the diameter of the oil return hole 4 is selected to be Φ2=6mm.

[0039] Example 3

[0040] In this embodiment, taking the shaft diameter corresponding to the sealing sleeve 1 as 80 mm to 120 mm as an example, the number of teeth of the labyrinth seal teeth 2 is 6.

[0041] Since the tooth width B, tooth height h, and oil groove width b of the labyrinth seal tooth 2 have a dimensional relationship of: 3.0Bmm>h≥2.2Bmm; 2.0Bmm>b≥1.5Bmm; 2.5mm>B≥1.5mm. In this embodiment, B=2.2mm, b=4mm, and h=6.16mm are set. At the same time, the diameter of the oil return groove 3 is selected to be Φ1=7mm; the diameter of the oil return hole 4 is selected to be Φ2=7mm.

[0042] Example 4

[0043] In this embodiment, taking the shaft diameter corresponding to the sealing sleeve 1 as greater than 120 mm as an example, the number of teeth of the labyrinth seal teeth 2 is 7.

[0044] Since the tooth width B, tooth height h, and oil groove width b of the labyrinth seal tooth 2 have a dimensional relationship of: 3.0Bmm>h≥2.2Bmm; 2.0Bmm>b≥1.5Bmm; 2.5mm>B≥1.5mm. In this embodiment, B=2.4mm, b=4.6mm, and h=6mm are set. At the same time, the diameter of the oil return groove 3 is selected to be Φ1=8mm; the diameter of the oil return hole 4 is selected to be Φ2=8mm.

[0045] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.

Claims

1. A multi-leakage-proof labyrinth sealing structure, characterized in that: The sealing structure includes: Sealing sleeve (1); A plurality of ring-shaped labyrinth seal teeth (2), each of the labyrinth seal teeth (2) being arranged on the inner hole of the sealing sleeve (1) and evenly distributed along the axial direction of the sealing sleeve (1), and an annular oil groove being formed between two adjacent labyrinth seal teeth (2); A U-shaped oil return groove (3), wherein the oil return groove (3) penetrates and connects part or all of the annular oil groove; Oil return holes (4) are distributed on both sides of the oil return groove (3), and each of the annular oil grooves is connected through each of the oil return holes (4).

2. The multi-leakage-proof labyrinth sealing structure according to claim 1, characterized in that: The number of teeth of the labyrinth seal teeth (2) is greater than or equal to 4 teeth.

3. The multi-leakage-proof labyrinth sealing structure according to claim 2, characterized in that: If the shaft diameter corresponding to the sealing sleeve (1) is ≤30 mm, the number of teeth of the labyrinth seal teeth (2) is 4; if the shaft diameter corresponding to the sealing sleeve (1) is >30 mm and ≤80 mm, the number of teeth of the labyrinth seal teeth (2) is 5; if the shaft diameter corresponding to the sealing sleeve (1) is >80 and ≤120 mm, the number of teeth of the labyrinth seal teeth (2) is 6; if the shaft diameter corresponding to the sealing sleeve (1) is >120 mm, the number of teeth of the labyrinth seal teeth (2) is 7.

4. The multi-leakage-proof labyrinth sealing structure according to claim 1, characterized in that: The tooth width B, tooth height h, and oil groove width b of the labyrinth seal teeth (2) have a dimensional relationship as follows: 3.0Bmm>h≥2.2Bmm; 2.0Bmm>b≥1.5Bmm; 2.5mm>B≥1.5mm.

5. The multi-leakage-proof labyrinth sealing structure according to claim 1, characterized in that: The diameter of the oil return groove (3) is Φ1, and 5mm≤Φ1≤8mm.

6. The multi-leakage-proof labyrinth sealing structure according to claim 1, characterized in that: The diameter of the oil return hole (4) is Φ2, and 5mm≤Φ2≤8mm.

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