Dustproof rotary joint

Abstract

The utility model relates to the technical field of rotary joints, and discloses a dustproof rotary joint which comprises a shell and a rotating body arranged in the shell, an end cover is arranged at the right end of the shell, the right end of the rotating body penetrates through the end cover and extends out of the shell, and the right side face of the end cover extends rightwards to form a connecting sleeve. An annular cavity is formed between the inner wall of the connecting sleeve and the outer wall of the rotating body, a flexible dust blocking sleeve is arranged in the annular cavity, and a cover plate is arranged at the right end of the connecting sleeve; a plurality of annular outer check rings abutting against the inner wall of the connecting sleeve are arranged on the outer surface of the dust blocking sleeve, and a plurality of annular inner check rings abutting against the outer surface of the rotating body are arranged on the inner surface of the dust blocking sleeve. The rotary joint has waterproof and dustproof effects, the service life of the rotary joint is effectively prolonged, and the rotary joint can better adapt to a dust environment and a humid environment.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary joints, in particular to a dustproof rotary joint. Background Art

[0002] A rotary joint is a sealing device that transfers fluid from a stationary pipe to a rotating or reciprocating device, thereby providing heating or cooling media for the rotating mechanism. Some rotary joints need to be used in dusty environments, which places high demands on the dustproof performance of the rotary joint. Currently, existing rotary joints usually focus on sealing, but have poor dustproof performance. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model provides a dustproof rotary joint with good dustproof performance.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A dustproof rotary joint comprises a shell, a rotating body arranged in the shell, an end cover is arranged at the right end of the shell, the right end of the rotating body passes through the end cover and extends out of the shell, the right side of the end cover extends to the right to form a connecting sleeve, an annular cavity is arranged between the inner wall of the connecting sleeve and the outer wall of the rotating body, a flexible dust-proof sleeve is arranged in the annular cavity, and a cover plate is arranged at the right end of the connecting sleeve;

[0006] The outer surface of the dust-blocking sleeve is provided with a plurality of annular outer retaining rings that abut against the inner wall of the connecting sleeve, and the inner surface of the dust-blocking sleeve is provided with a plurality of annular inner retaining rings that abut against the outer surface of the rotating body. The annular outer retaining ring and the annular inner retaining ring on the dust-blocking sleeve play multiple roles of blocking dust and water, and at the same time, the contact area between the dust-blocking sleeve and the rotating body is small, and the rotation resistance of the rotating body is small, thereby effectively preventing external dust and water from entering the inner wall of the shell.

[0007] Preferably, the cross-sections of the annular outer retaining ring and the annular inner retaining ring are both isosceles trapezoidal structures; an outer annular groove is formed between adjacent annular outer retaining rings, and an inner annular groove is formed between adjacent annular inner retaining rings, and the outer annular groove and the inner annular groove are both filled with butter. The annular outer retaining ring and the annular inner retaining ring with isosceles trapezoidal cross-section have stable structures, and further reduce the contact area with the rotating body and the inner wall of the housing, reduce the rotation resistance and wear; and butter is arranged in the outer annular groove and the inner annular groove, which plays a sealing role on the one hand and a lubricating role on the other.

[0008] Preferably, a first annular stepped surface is provided at the inner wall of the housing corresponding to the left end of the rotating body, an annular boss is provided on the outer side of the left end of the rotating body, and a second annular stepped surface is provided at the inner wall of the housing corresponding to the annular boss; a first sealing ring is provided between the first annular stepped surface and the left end of the rotating body, a thrust bearing is provided between the second annular stepped surface and the left end of the annular boss, and a ball bearing is provided between the right end of the housing and the rotating body. The second annular stepped surface cooperates with the thrust bearing to play the role of axial pressure resistance and limit, and the rotation of the rotating body is more stable.

[0009] Preferably, the right end face of the annular boss is an arc surface, a second sealing ring is provided on the outer side of the rotating body at the right end of the annular boss, a first retaining ring is provided on the right end of the second sealing ring, a second retaining ring is provided on the left end of the ball bearing, and a compression spring is sleeved on the outer side of the rotating body between the first retaining ring and the second retaining ring. The second sealing ring further plays a sealing role.

[0010] Preferably, the end cover is threadedly connected to the housing, the left side of the end cover extends leftward to form a support ring abutting against the ball bearing, an outer sealing ring is provided between the outer side of the support ring and the inner wall of the housing, and an inner sealing ring is provided between the inner side of the support ring and the rotating body. The outer sealing ring and the inner sealing ring improve the sealing performance of the connection between the end cover and the housing.

[0011] Therefore, the utility model has the effects of waterproofing and dustproofing, effectively prolonging the service life of the rotary joint, and making the rotary joint better adaptable to dusty and humid environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 for Figure 1 sectional view of .

[0014] Figure 3 A cross-sectional view of the shell.

[0015] Figure 4 for Figure 2 A partial enlarged schematic diagram in the middle.

[0016] Figure 5 It is a schematic diagram of the structure of the dust-proof sleeve.

[0017] Figure 6 for Figure 5 sectional view of .

[0018] In the figure: housing 10, first annular step surface 100, second annular step surface 101, first sealing ring 11, thrust bearing 12, ball bearing 13, second sealing ring 14, first retaining ring 15, second retaining ring 16, compression spring 17, rotating body 20, annular boss 21, end cover 30, connecting sleeve 31, annular cavity 310, cover plate 32, supporting ring 33, outer sealing ring 34, inner sealing ring 35, dustproof sleeve 40, annular outer retaining ring 41, outer annular groove 410, annular inner retaining ring 42, inner annular groove 420. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention.

[0020] It should be understood that, in this document, the expressions "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.

[0021] like Figure 1-Figure 6 A dustproof rotary joint shown in the figure includes a shell 10 and a rotating body 20 arranged in the shell. An end cover 30 is provided at the right end of the shell, and the end cover is threadedly connected to the shell. The right end of the rotating body 20 passes through the end cover and extends out of the shell. The right side surface of the end cover 30 extends to the right to form a connecting sleeve 31. An annular cavity 310 is provided between the inner wall of the connecting sleeve 31 and the outer wall of the rotating body. A flexible dust-proof sleeve 40 is provided in the annular cavity. A cover plate 32 is provided at the right end of the connecting sleeve 31, and the cover plate is threadedly connected to the connecting sleeve.

[0022] The outer surface of the dust-blocking sleeve 40 is provided with a plurality of annular outer retaining rings 41 abutting against the inner wall of the connecting sleeve, and the inner surface of the dust-blocking sleeve is provided with a plurality of annular inner retaining rings 42 abutting against the outer surface of the rotating body; the cross-sections of the annular outer retaining rings 41 and the annular inner retaining rings 42 are both isosceles trapezoidal structures, and an outer annular groove 410 is formed between adjacent annular outer retaining rings, and an inner annular groove 420 is formed between adjacent annular inner retaining rings, and the outer annular grooves and the inner annular grooves are both filled with butter. In some embodiments, the dust-blocking sleeve 40 is made of flexible materials such as rubber and silicone.

[0023] A first annular step surface 100 is provided on the inner wall of the shell 10 corresponding to the left end of the rotating body, an annular boss 21 is provided on the outer side of the left end of the rotating body 20, and a second annular step surface 101 is provided on the inner wall of the shell 10 corresponding to the annular boss; a first sealing ring 11 is provided between the first annular step surface 100 and the left end of the rotating body 20, a thrust bearing 12 is provided between the second annular step surface 101 and the left end of the annular boss, and a ball bearing 13 is provided between the right end of the shell 10 and the rotating body.

[0024] The right end face of the annular boss 21 is an arc surface, and a second sealing ring 14 is provided on the outer side of the rotating body 20 at the right end of the annular boss, a first retaining ring 15 is provided on the right end of the second sealing ring 14, a second retaining ring 16 is provided on the left end of the ball bearing 13, and a compression spring 17 is provided on the outer side of the rotating body between the first retaining ring and the second retaining ring.

[0025] The left side of the end cover 30 extends leftward to form a support ring 33 abutting against the ball bearing. An outer sealing ring 34 is provided between the outer side of the support ring and the inner wall of the shell, and an inner sealing ring 35 is provided between the inner side of the support ring and the rotating body.

[0026] A dust-blocking sleeve is separately arranged between the end cover and the rotating body. The annular outer retaining ring and the annular inner retaining ring on the dust-blocking sleeve play multiple dust and water blocking roles, and the outer annular groove and the inner annular groove are filled with butter to further enhance the lubrication and sealing effects. The rotating body and the housing are triple-sealed by the first sealing ring, the second sealing ring, and the outer sealing ring (inner sealing ring) respectively. The overall sealing effect is good, and the internal medium is not easy to leak during use.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.

[0028] Although specific embodiments of the present invention are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present invention. Various substitutions, changes and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A dustproof rotary joint, comprising a housing, a rotating body arranged in the housing, the right end of the housing is provided with an end cover, the right end of the rotating body passes through the end cover and extends out of the housing, wherein: The right side of the end cover extends to the right to form a connecting sleeve, an annular cavity is provided between the inner wall of the connecting sleeve and the outer wall of the rotating body, a flexible dust-proof sleeve is provided in the annular cavity, and a cover plate is provided at the right end of the connecting sleeve; The outer surface of the dust-blocking sleeve is provided with a plurality of annular outer retaining rings abutting against the inner wall of the connecting sleeve, and the inner surface of the dust-blocking sleeve is provided with a plurality of annular inner retaining rings abutting against the outer surface of the rotating body.

2. A dustproof rotary joint according to claim 1, characterized in that: The cross sections of the annular outer retaining ring and the annular inner retaining ring are both isosceles trapezoidal structures; outer annular grooves are formed between adjacent annular outer retaining rings, and inner annular grooves are formed between adjacent annular inner retaining rings, and the outer annular grooves and the inner annular grooves are both filled with butter.

3. A dustproof rotary joint according to claim 1 or 2, characterized in that: A first annular step surface is provided at the inner wall of the shell corresponding to the left end of the rotating body, an annular boss is provided on the outer side of the left end of the rotating body, and a second annular step surface is provided at the inner wall of the shell corresponding to the annular boss; a first sealing ring is provided between the first annular step surface and the left end of the rotating body, a thrust bearing is provided between the second annular step surface and the left end of the annular boss, and a ball bearing is provided between the right end of the shell and the rotating body.

4. A dustproof rotary joint according to claim 3, characterized in that: The right end face of the annular boss is an arc surface, a second sealing ring is provided on the outer side of the rotating body at the right end of the annular boss, a first retaining ring is provided on the right end of the second sealing ring, a second retaining ring is provided on the left end of the ball bearing, and a compression spring is provided on the outer side of the rotating body between the first retaining ring and the second retaining ring.

5. A dustproof rotary joint according to claim 4, characterized in that: The end cover is threadedly connected to the shell, and the left side of the end cover extends leftward to form a support ring abutting against the ball bearing. An outer sealing ring is provided between the outer side of the support ring and the inner wall of the shell, and an inner sealing ring is provided between the inner side of the support ring and the rotating body.

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