Sealing compensation type rotary joint structure

Abstract

The utility model relates to the technical field of rotating joints, and discloses a sealing compensation type rotating joint structure which comprises a shell and a hollow rotating body which is coaxially and rotatably connected with the shell, a stepped hole is formed in the inner wall of the shell, a thrust bearing is arranged on the stepped surface of the stepped hole, and the thrust bearing is connected with the shell. A supporting convex ring abutting against the thrust bearing is arranged on the outer side face of the left end of the rotating body. An annular gap is formed between the outer side face of the rotating body and the inner wall of the stepped hole, the right end of the annular gap is provided with a pressing ring arranged on the rotating body in a sliding and sleeving mode, the annular gap is filled with sealing filler, the right end of the shell is provided with an end cover, and the right end of the rotating body penetrates through the end cover and extends out of the end cover. A rolling bearing is arranged between the end cover and the rotating body; a flange ring is arranged at the right end of the pressing ring, and an elastic piece for driving the pressing ring to elastically press the packing is arranged between the flange ring and the end cover. The sealing structure has the advantage of being good in sealing effect.

Description

Technical Field

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

[0002] A rotary joint is a connection and sealing device that transports fluid media from a stationary pipeline to a rotating or reciprocating device, thereby providing heating or cooling media for the rotating mechanism. The rotating body and the shell in the rotary joint are coaxially connected, and a sealing ring is required at the rotating connection for sealing. Due to the long-term rotation of the rotating body, the sealing ring will continue to wear and eventually cause leakage. For a rotary joint, rotary sealing is a very important technical indicator. The sealing performance seriously affects the overall quality and life of the rotary joint. The sealing performance of the common rotary joints is poor. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model provides a sealing compensation type rotary joint structure with good sealing effect.

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

[0005] A sealing compensation type rotary joint structure comprises a shell, a hollow rotating body coaxially connected to the shell, the inner wall of the shell is provided with a stepped hole, the stepped surface of the stepped hole is provided with a thrust bearing, the outer side surface of the left end of the rotating body is provided with a supporting convex ring abutting against the thrust bearing; an annular gap is formed between the outer side surface of the rotating body and the inner wall of the stepped hole, the right end of the annular gap is provided with a pressure ring slidingly sleeved on the rotating body, the annular gap is filled with sealing filler, the right end of the shell is provided with an end cover, the right end of the rotating body passes through the end cover and extends out of the end cover, a rolling bearing is provided between the end cover and the rotating body; the right end of the pressure ring is provided with a flange ring, and an elastic member is provided between the flange ring and the end cover to drive the pressure ring to elastically compress the sealing filler.

[0006] The elastic member elastically compresses the pressing ring, and the left end of the pressing ring compresses the sealing packing, thereby achieving sealing compensation and maintaining effective sealing for a long time.

[0007] Preferably, the front end of the rotating body is in clearance fit with the inner wall of the shell, and a first sealing ring is provided between the outer side of the front end of the rotating body and the inner wall of the shell. The first sealing ring plays a sealing role.

[0008] Preferably, the right end face of the supporting convex ring is set as the first conical surface, the first conical surface is provided with a second sealing ring, the left end face of the second sealing ring is in contact with the first conical surface, the right end face of the second sealing ring is set as the second conical surface, the left end face of the pressure ring is set as the third conical surface, the second conical surface and the third conical surface are both facing the outer side of the rotating body; the sealing packing is arranged between the second conical surface and the third conical surface. The second sealing ring is in contact with the first conical surface, and the sealing effect of the conical sealing surface is better; the second conical surface and the third conical surface act on the sealing packing, on the one hand, the sealing packing is pressed tightly, and on the other hand, a component force is generated on the sealing packing toward the outer surface of the rotating body, further improving the sealing effect.

[0009] Preferably, a plurality of annular grooves are provided on the outer wall of the rotating body between the second conical surface and the third conical surface. The annular grooves increase the sealing surface area between the sealing packing and the outer surface of the rotating body, further improving the sealing effect.

[0010] Preferably, a third sealing ring is provided between the inner wall of the pressure ring and the outer wall of the rotating body.

[0011] Preferably, the flange ring is fixed with a plurality of circumferentially distributed push rods, the end cover is provided with a plurality of threaded holes at positions corresponding to the push rods, the outer ends of the threaded holes are provided with countersunk holes, the right end of the push rod slides through the threaded holes, a bolt is provided in the threaded holes, and a spring gasket is provided between the bolt and the push rod. When the rotary joint leaks during use, the bolt is directly tightened further, and the bolt pushes the push rod to the left, so that the pressure ring further compresses the sealing packing to prevent leakage; in this way, the equipment can continue to operate, and the rotary joint can be maintained or replaced after the equipment is shut down.

[0012] Preferably, the elastic member is configured as a compression spring, and the compression spring is sleeved on the push rod.

[0013] Preferably, a magnetic isolation plate is provided at the right end of the countersunk hole, and the magnetic isolation plate is adsorbed on the end cover to close the countersunk hole.

[0014] Preferably, a dustproof ring is provided between the end cover and the rotating body.

[0015] Therefore, the utility model has the beneficial effect of good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 Exploded diagram.

[0018] Figure 3 for Figure 2A partial enlarged schematic diagram in the middle.

[0019] In the figure: housing 1, annular gap 100, rotating body 2, supporting convex ring 20, annular groove 21, first sealing ring 200, thrust bearing 3, pressure ring 4, flange ring 40, third conical surface 41, push rod 42, sealing packing 5, end cover 6, threaded hole 60, countersunk hole 61, bolt 62, spring washer 63, magnetic isolation sheet 64, rolling bearing 7, elastic member 8, second sealing ring 9, second conical surface 90, third sealing ring 10, dustproof retaining ring 11. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] like Figure 1-Figure 3 A sealing compensation type rotary joint structure shown in the figure comprises a housing 1, a hollow rotating body 2 coaxially connected with the housing, a stepped hole is provided on the inner wall of the housing 1, a thrust bearing 3 is provided on the stepped surface of the stepped hole, a supporting convex ring 20 abutting against the thrust bearing is provided on the outer side surface of the left end of the rotating body 2; an annular gap 100 is formed between the outer side surface of the rotating body 2 and the inner wall of the stepped hole, a pressing ring 4 slidingly sleeved on the rotating body is provided at the right end of the annular gap 100, a sealing filler 5 is filled in the annular gap, an end cover 6 is provided at the right end of the housing 1, the right end of the rotating body 2 passes through the end cover and extends out of the end cover, a rolling bearing 7 is provided between the end cover and the rotating body, and a dustproof retaining ring 11 is provided between the end cover and the rotating body; a flange ring 40 is provided at the right end of the pressing ring 4, and an elastic member 8 driving the pressing ring to elastically compress the sealing filler is provided between the flange ring and the end cover. The sealing filler in this embodiment adopts graphite packing.

[0023] The front end of the rotating body 2 is clearance-matched with the inner wall of the shell, and a first sealing ring 200 is provided between the outer side of the front end of the rotating body 2 and the inner wall of the shell.

[0024] The right end face of the supporting convex ring 20 is set as the first conical surface, the first conical surface is provided with a second sealing ring 9, the left end face of the second sealing ring 9 is in contact with the first conical surface, the right end face of the second sealing ring 9 is set as the second conical surface 90, the left end face of the pressing ring 4 is set as the third conical surface 41, the second conical surface and the third conical surface are both facing the outer side of the rotating body, the outer wall of the rotating body 2 is provided with a plurality of annular grooves 21 at a position between the second conical surface and the third conical surface, and the sealing packing 5 is provided between the second conical surface and the third conical surface. A third sealing ring 10 is provided between the inner wall of the pressing ring 4 and the outer wall of the rotating body.

[0025] A plurality of circumferentially distributed push rods 42 are fixed on the flange ring 40, and a plurality of threaded holes 60 are provided on the end cover 6 at positions corresponding to the push rods. A countersunk hole 61 is provided at the outer end of the threaded hole. The right end of the push rod 42 slides through the threaded hole. A bolt 62 is provided in the threaded hole. A spring washer 63 is provided between the bolt and the push rod. The elastic member 8 is configured as a compression spring, which is sleeved on the push rod; a magnetic isolation sheet 64 is provided at the right end of the countersunk hole, which is adsorbed on the end cover to close the countersunk hole.

[0026] Combined with the attached drawings, the principle of the utility model is as follows: the first sealing ring plays a primary seal, the second sealing ring plays a secondary seal, and the sealing filler plays a tertiary seal; during the use of the rotary joint, the elastic member elastically compresses the pressure ring, and the left end of the pressure ring compresses the sealing filler, thereby maintaining the seal. As the rotary joint is used, the sealing filler is worn, and the pressure ring can adaptively compress the sealing filler, thereby achieving the effect of wear compensation seal; when the rotary joint leaks during use (caused by seal failure), without stopping the machine or disassembling the rotary joint, open the magnetic isolation sheet, tighten each bolt, and the bolt pushes the pressure ring through the push rod to further compress the sealing filler, thereby solving the dripping problem. When the equipment is out of use, repair or replace the rotary joint.

[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 sealed compensating rotary joint structure, comprising a housing and a hollow rotating body coaxially connected to the housing, characterized in that: A stepped hole is provided on the inner wall of the shell, a thrust bearing is provided on the stepped surface of the stepped hole, and a supporting convex ring abutting against the thrust bearing is provided on the outer side surface of the left end of the rotating body; An annular gap is formed between the outer side surface of the rotating body and the inner wall of the stepped hole, a pressure ring slidingly sleeved on the rotating body is provided at the right end of the annular gap, a sealing filler is filled in the annular gap, an end cover is provided at the right end of the shell, the right end of the rotating body passes through the end cover and extends out of the end cover, and a rolling bearing is provided between the end cover and the rotating body; A flange ring is arranged at the right end of the pressure ring, and an elastic member for driving the pressure ring to elastically compress the sealing filler is arranged between the flange ring and the end cover.

2. The sealing compensation rotary joint structure according to claim 1 is characterized in that: The front end of the rotating body is clearance-matched with the inner wall of the shell, and a first sealing ring is arranged between the outer side of the front end of the rotating body and the inner wall of the shell.

3. The sealing compensation rotary joint structure according to claim 1 is characterized in that: The right end face of the supporting convex ring is set as a first conical surface, a second sealing ring is arranged at the first conical surface, the left end face of the second sealing ring abuts against the first conical surface, the right end face of the second sealing ring is set as a second conical surface, the left end face of the pressure ring is set as a third conical surface, the second conical surface and the third conical surface both face the outer side surface of the rotating body; the sealing filler is arranged between the second conical surface and the third conical surface.

4. The sealing compensation rotary joint structure according to claim 3 is characterized in that: A plurality of annular grooves are arranged on the outer wall of the rotating body at a position between the second conical surface and the third conical surface.

5. The seal compensating rotary joint structure according to claim 1 or 3, characterized in that: A third sealing ring is arranged between the inner wall of the pressure ring and the outer wall of the rotating body.

6. The seal compensating rotary joint structure according to claim 1 is characterized in that: The flange ring is fixed with a plurality of push rods distributed along the circumferential direction, the end cover is provided with a plurality of threaded holes at positions corresponding to the push rods, the outer ends of the threaded holes are provided with countersunk holes, the right end of the push rod slides through the threaded holes, a bolt is provided in the threaded hole, and a spring gasket is provided between the bolt and the push rod.

7. The seal compensating rotary joint structure according to claim 6 is characterized in that: The elastic member is configured as a compression spring, and the compression spring is sleeved on the push rod.

8. The seal compensating rotary joint structure according to claim 6 is characterized in that: A magnetic isolation sheet is provided at the right end of the countersunk hole, and the magnetic isolation sheet is adsorbed on the end cover to close the countersunk hole.

9. The seal compensating rotary joint structure according to claim 1 is characterized in that: A dustproof retaining ring is arranged between the end cover and the rotating body.

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