A crescent tooth labyrinth seal and sealing device
The crescent tooth maze sealing structure solves the problem of easy damage and high leakage in powder sealing by setting interlaced crescent teeth in the radial direction on the sealing ring, achieving a more efficient sealing effect and a convenient cleaning process.
Patent Information
- Application Number
- CN202510141294.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2025-04-01
AI Technical Summary
The existing maze sealing technology is prone to damage under repeated friction, especially when used for powder sealing, it is difficult to discharge the medium after entering the maze gap, which is prone to agglomeration and damage the seal, resulting in a high risk of leakage.
The crescent tooth maze sealing structure is adopted, including a first sealing ring and a second sealing ring, and the two are arranged at a distance from the upper and lower level. The crescent tooth is spaced in a radial direction, and the crescent tooth is arranged in an interlaced gap and is bent in a direction away from the center of the circle, forming an axial and radial gap greater than zero, which meets the equipment accuracy requirements.
Through the crescent tooth maze sealing structure, the sealing effect is enhanced, and the motion damping and centrifugal force of the medium are used to promote the media to move away from the center, reducing the risk of leakage, and fluid is passed through the air inlet for back-cleaning, avoiding the accumulation of sealing gaps.
Smart Images
Figure CN119737453A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of labyrinth seals, and more specifically, to a crescent-shaped labyrinth seal. Background Art
[0002] To prevent leakage of media, traditional methods mostly use the method of filling with soft materials. This method has limitations. They are easily damaged and fail under repeated friction, especially when the sealed medium is powder. Soft materials such as packing and gaskets may lose their sealing performance due to aging and mechanical wear in long-term operation.
[0003] Non-contact seals include labyrinth seals that are suitable for powder sealing, but they require high equipment precision and the powder material is difficult to discharge after entering the labyrinth gap. The labyrinth seal is damaged after agglomeration, and the risk of leakage is still relatively large, which is an urgent problem that needs to be solved. Summary of the invention
[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the embodiments of the present application is to provide a crescent-shaped labyrinth seal.
[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a crescent-tooth labyrinth seal, including: a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring are arranged at intervals in the upper and lower directions, at least two circles of first crescent teeth are convexly arranged at intervals in the radial direction on the first sealing surface of the first sealing ring close to the second sealing ring, and at least two circles of second crescent teeth are convexly arranged at intervals in the radial direction on the second sealing surface of the second sealing ring close to the second sealing ring; the first crescent teeth and the second crescent teeth are arranged with staggered gaps and are bent in the direction away from the center of the circle.
[0006] In one embodiment, each of the first crescent teeth and the second crescent teeth includes a tooth root arc ab segment, a tooth back arc bc segment, a tooth top arc cd segment and a tooth flank arc de segment.
[0007] In one embodiment, the coordinate equation of the tooth root arc segment ab is: x=(R0-R1)cos(t1) y=(R0-R1)sin(t1) R0 is the base circle radius, R1 is the offset in the radial direction, and t1 is the parameter of the root arc ab segment.
[0008] In one embodiment, the coordinate system equation of the tooth back arc bc segment is: x=(R0+R1)cos(t2) y=(R0+R1)sin(t2)+2R0 Among them, t2 is the parameter of the tooth back arc bc segment.
[0009] In one embodiment, the coordinate system equation of the tooth tip arc cd segment is: x=R0cos +R1cos(t3) y=R0sin +2R0+R1sin(t3) in, The range is: < < , t3 is the parameter of the tooth top arc cd segment.
[0010] In one embodiment, the coordinate system equation of the ulna-abdomen arc segment de is: x=(R0-R1)cos(t4) y=(R0-R1)sin(t4)+2R0 Among them, t4 is the parameter variable of the ulnar-abdominal arc segment de.
[0011] In one embodiment, the tooth root arc segment ab and the tooth back arc segment bc, the tooth back arc segment bc and the tooth top arc segment cd, and the tooth top arc segment cd and the tooth flank arc segment de are all tangently connected.
[0012] Another object of the present application is to provide a sealing device, comprising a rotating shaft, an end cover, a shaft seal, a shell, an air inlet and the crescent-shaped labyrinth seal as described above, wherein the rotating shaft is rotatably arranged on the shell, a shaft seal is arranged between the shell and the rotating shaft and fixed by the end cover, the first sealing ring is fixed to the inner wall of the shell, the second sealing ring is fixed to the rotating shaft, an air inlet is arranged on the shell between the shaft seal and the first sealing ring, and the air inlet is communicated with the gap between the first sealing ring and the second sealing ring.
[0013] The beneficial effects of the crescent tooth labyrinth seal and sealing device provided by the present application are: 1. The radial clearance and axial clearance of the crescent teeth between the first sealing ring and the second sealing ring are large, and the precision requirement of the equipment is not high; 2. Since the crescent teeth are bent in the direction away from the center of the circle, the medium moving away from the center of the circle is subject to less damping, and conversely, the medium moving toward the center of the circle is subject to greater resistance. Therefore, gas, liquid, centrifugal force, etc. can be used to make the sealed medium move away from the center of the circle, which can improve the sealing effect; 3. The arc transitions of the crescent teeth are natural. When the fluid is passed into the air inlet for backwashing, the materials accumulated in the sealing gap can flow back into the cavity along the tooth surface, leaving no dead corners for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0015] Figure 1 A schematic cross-sectional view of a crescent-tooth labyrinth seal provided in an embodiment of the present application; Figure 2 A schematic diagram of the coordinates of the crescent teeth in the crescent tooth labyrinth seal provided in an embodiment of the present application; Figure 3 This is a schematic diagram of the cross-sectional structure of the sealing device provided in an embodiment of the present application.
[0016] Among them, the reference numerals in the figure are: 1. First sealing ring; 11. First crescent tooth; 2. Second sealing ring; 21. Second crescent tooth; 3. Rotating shaft; 4. End cover; 5. Shaft seal; 6. Shell; 7. Air inlet. DETAILED DESCRIPTION
[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0018] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0021] Please also read Figure 1 and Figure 2 , a crescent tooth labyrinth seal provided by an embodiment of the present application is now described. The crescent tooth labyrinth seal comprises: a first sealing ring 1 and a second sealing ring 2, the first sealing ring 1 and the second sealing ring 2 are arranged at intervals up and down, at least two circles of first crescent teeth 11 are arranged at intervals along the radial direction on the first sealing surface (lower surface) of the first sealing ring 1 close to the second sealing ring 2, and at least two circles of second crescent teeth 21 are arranged at intervals along the radial direction on the second sealing surface (upper surface) of the second sealing ring 2 close to the second sealing ring 2; the first crescent teeth 11 and the second crescent teeth 21 are arranged with staggered gaps and are bent in a direction away from the center of the circle, and the first crescent teeth 11 and the second crescent teeth 21 do not contact each other to form a sealing gap.
[0022] Among them, Figure 2 As shown, each of the first crescent teeth 11 and the second crescent teeth 21 includes a tooth root arc ab segment, a tooth back arc bc segment, a tooth top arc cd segment and a tooth flank arc de segment. The tooth root arc ab segment and the tooth back arc bc segment, the tooth back arc bc segment and the tooth top arc cd segment, and the tooth top arc cd segment and the tooth flank arc de segment are all tangently connected at their intersections.
[0023] In this embodiment, the coordinate equation of the tooth root arc segment ab is: x=(R0-R1)cos(t1) y=(R0-R1)sin(t1) The coordinate system equation of the tooth back arc bc segment is: x=(R0+R1)cos(t2) y=(R0+R1)sin(t2)+2R0 The coordinate system equation of the tooth tip arc cd segment is: x=R0cos +R1cos(t3) y=R0sin +2R0+R1sin(t3) The coordinate system equation of the ulna-abdomen arc segment de is: x=(R0-R1)cos(t4) y=(R0-R1)sin(t4)+2R0 Among them, R0 is the base circle radius, R1 is the offset, t1, t2, t3, t4 are all the corresponding arc segment parameters, The location of Figure 2 As shown, The range is: < < Specifically, the difference between R0 and R1 is the radius of the circle formed by the tooth root arc segments ab; the data of t1, t2, t3, and t4 are, < t1<π, < t2< , < t3< , π <t4< .
[0024] In this embodiment, a sealing device is also provided, in which the above-mentioned crescent-tooth labyrinth seal is applied. Specifically, the sealing device includes: a rotating shaft 3, an end cover 4, a shaft seal 5, a shell 6, an air inlet 7 and the crescent-tooth labyrinth seal as described above. Specifically, the rotating shaft 3 is rotatably arranged on the shell 6, a shaft seal 5 is arranged between the shell 6 and the rotating shaft 3 and fixed by the end cover 4, the end cover 4 is fixedly connected to the outside of the shell 6, the first sealing ring 1 is fixed on the inner wall of the shell 6, the second sealing ring 2 is fixed on the rotating shaft 3, the second sealing ring 2 rotates synchronously with the rotating shaft 3, and the first sealing ring 1 is stationary relative to the second sealing ring 2; an air inlet 7 is arranged on the shell 6 between the shaft seal 5 and the first sealing ring 1, and the air inlet 7 is connected to the gap between the first sealing ring 1 and the second sealing ring 2. Compressed gas or liquid can be introduced through the air inlet 7.
[0025] When the equipment is working, if the material enters the gap channel between the first sealing ring 1 and the second sealing ring 2, the crescent teeth will prevent the material from leaking out. The second sealing ring 2 will generate centrifugal force when it rotates with the main shaft. The centrifugal force generated by the contact between the second sealing ring 2 and the material causes the material to flow back into the cavity along the crescent teeth, and cooperates with the compressed air backblowing to play a sealing role. The axial and radial spacing of the labyrinth seal is large, the precision requirements for parts are low, the backblowing resistance is small, and the power consumption of the air compressor required for the air seal can be saved. When cleaning is needed, the cleaning liquid can be introduced through the air inlet 7, and cleaning is also very convenient.
[0026] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A crescent-shaped labyrinth seal, characterized in that: include: A first sealing ring (1) and a second sealing ring (2), wherein the first sealing ring (1) and the second sealing ring (2) are arranged at intervals in the upper and lower parts, and at least two circles of first crescent teeth (11) are arranged at intervals in the radial direction on a first sealing surface of the first sealing ring (1) close to the second sealing ring (2), and at least two circles of second crescent teeth (21) are arranged at intervals in the radial direction on a second sealing surface of the second sealing ring (2) close to the second sealing ring (2); the first crescent teeth (11) and the second crescent teeth (21) are arranged with staggered gaps and are bent in a direction away from the center of a circle.
2. The crescent-shaped labyrinth seal according to claim 1, characterized in that: Each of the first crescent teeth and the second crescent teeth includes a tooth root arc ab segment, a tooth back arc bc segment, a tooth top arc cd segment and a tooth flank arc de segment.
3. The crescent-shaped labyrinth seal according to claim 2, characterized in that: The coordinate equation of the tooth root arc segment ab is: x=(R0-R1)cos(t1) y=(R0-R1)sin(t1) R0 is the base circle radius, R1 is the offset, and t1 is the parameter of the root arc ab segment.
4. The crescent-shaped labyrinth seal according to claim 3, characterized in that: The coordinate system equation of the tooth back arc bc segment is: x=(R0+R1)cos(t2) y=(R0+R1)sin(t2)+2R0 Among them, t2 is the parameter of the tooth back arc bc segment.
5. The crescent-shaped labyrinth seal according to claim 4, characterized in that: The coordinate system equation of the tooth tip arc cd segment is: x=R0cos +R1cos(t3) <h2 style=";text-align:left;direction:ltr">y=R0sin<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> +2R0+R1sin(t3) in, The range is: < < , t3 is the parameter of the tooth top arc cd segment.
6. The crescent-shaped labyrinth seal according to claim 5, characterized in that: The coordinate system equation of the ulna-abdomen arc segment de is: x=(R0-R1)cos(t4) y=(R0-R1)sin(t4)+2R0 Among them, t4 is the parameter variable of the ulnar-abdominal arc segment de.
7. The crescent-shaped labyrinth seal according to claim 6, characterized in that: The tooth root arc segment ab and the tooth back arc segment bc, the tooth back arc segment bc and the tooth top arc segment cd, and the tooth top arc segment cd and the tooth flank arc segment de are all tangently connected.
8. A sealing device, characterized in that include: A rotating shaft (3), an end cover (4), a shaft seal (5), a shell (6), an air inlet (7), and a crescent-shaped labyrinth seal as described in any one of claims 1 to 7, wherein the rotating shaft (3) is rotatably arranged on the shell (6), a shaft seal (5) is arranged between the shell (6) and the rotating shaft (3) and is fixed by the end cover (4), the first sealing ring (1) is fixed on the inner wall of the shell (6), the second sealing ring (2) is fixed on the rotating shaft (3), the shell (6) between the shaft seal (5) and the first sealing ring (1) is provided with the air inlet (7), and the air inlet (7) is connected to the gap between the first sealing ring (1) and the second sealing ring (2).