CN216279946U

CN216279946U - High-temperature-resistant rotary joint

Info

Publication number: CN216279946U
Application number: CN202122760961.0U
Authority: CN
Inventors: 李勇
Original assignee: Hangzhou Younengte Rotary Adapter Precision Manufacturing Co ltd
Current assignee: Hangzhou Younengte Rotary Adapter Precision Manufacturing Co ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-04-12
Anticipated expiration: 2031-11-11

Abstract

The utility model relates to the technical field of rotary joints, and discloses a high-temperature-resistant rotary joint which comprises a shell, wherein a central through hole is formed in the shell, a hollow rotary shaft is arranged in the central through hole, an end cover is arranged at the upper end of the shell, a bearing is arranged in the end cover, the upper end of the rotary shaft penetrates through the bearing and extends out of the shell, the lower end of the shell extends to form a connecting pipe, a first annular step surface is arranged on the hole wall of the lower end of the shell, a second annular step surface is arranged on the first annular step surface, a graphite support ring is arranged between the lower end of the rotary shaft and the second annular step surface, an annular gap is formed between the rotary shaft and the central through hole, a sealing filler is filled in the annular gap, a compression ring is sleeved at the upper end of the annular gap on the rotary shaft, a check ring is arranged at the upper end of the compression ring, and a compression spring is arranged between the check ring and the end cover. The utility model has the advantages of stable performance and good sealing performance at high temperature.

Description

High-temperature-resistant rotary joint

Technical Field

The utility model relates to the technical field of rotary joints, in particular to a high-temperature-resistant rotary joint.

Background

A rotary joint is a joint seal for the delivery of a fluid medium from a stationary pipe to a rotating or reciprocating device to provide a heating or cooling medium to the mechanism that is in rotary motion. Some rotary joints are connected with high-temperature media such as high-temperature steam and high-temperature grease in pipelines, when the rotary joints are used for conveying high-temperature fluid, the sealing performance of the rotary joints is higher, common sealing rings are easy to soften under the action of high temperature, and sealing failure is easy to cause due to the thermal barrier cold contraction phenomenon, so that the high-temperature fluid is easy to leak.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing when the rotary joint in the prior art is used for conveying high-temperature fluid, the utility model provides the high-temperature resistant rotary joint which has stable performance and can keep good sealing at a high-temperature state.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a high temperature resistant rotary joint, includes the casing, is equipped with central through-hole in the casing, is equipped with hollow pivot in the central through-hole, and the upper end of casing is equipped with the end cover, is equipped with the bearing in the end cover, the upper end of pivot is passed the bearing and is stretched out outside the casing, and the lower extreme of casing extends and forms the connecting pipe, the lower extreme pore wall department of casing is equipped with first annular ladder face, is equipped with second annular ladder face on the first annular ladder face, be equipped with the graphite support ring between the lower extreme of pivot and the second annular ladder face, form annular gap between pivot and the central through-hole, the annular gap intussuseption is filled with sealing filler, the upper end department cover that lies in annular gap in the pivot is equipped with the clamping ring, the upper end of clamping ring is equipped with the retaining ring, be equipped with the pressure spring between retaining ring and the end cover. The lower end of the rotating shaft and the first annular step surface support are supported by a graphite support ring, and the lower end of the rotating shaft abuts against the graphite support ring under the action of a pressure spring, so that the sealing effect is achieved, and the smooth rotation of the rotating shaft can be guaranteed; the annular gap between the rotating shaft and the central through hole is filled with the sealing filler and is always compressed by the compression ring, and the rotating shaft can keep good sealing performance even if being influenced by thermal barrier contraction for a long time.

Preferably, a convex ring is arranged on the outer side of the lower end of the rotating shaft, the outer surface of the convex ring is an arc surface, a lower sealing ring is arranged on the lower side of the convex ring, an upper sealing ring is arranged on the upper side of the convex ring, and the upper sealing ring and the lower sealing ring are both graphite sealing rings. Through the secondary sealing of the double graphite sealing rings, the overall sealing effect is further improved.

Preferably, the lower end surface of the pressing ring is wedge-shaped. The wedge structure of clamping ring lower extreme can insert in the sealing filler, can compress tightly sealing filler, ensures that sealing filler is full of whole annular gap.

Preferably, an upward convex lower annular boss is arranged at the inner diameter of the second annular stepped surface, and a downward convex upper annular boss is arranged at the inner diameter of the lower end of the rotating shaft. The contact area between the lower annular boss and the graphite support ring is increased by the upper annular boss, so that the sealing surface is increased, and the sealing property is improved.

Preferably, an isolation sealing ring is arranged between the inner hole of the end cover and the outer wall of the rotating shaft. The isolating seal ring prevents external water vapor, dust and the like from entering the bearing in the end cover, and plays a role in protecting the bearing.

Therefore, the utility model has the advantages of stable performance and good sealing performance at high temperature.

Drawings

FIG. 1 is a schematic diagram of a structure of the present invention.

Fig. 2 is a schematic view of the internal structure of fig. 1.

Fig. 3 is a schematic view of the internal structure of the housing.

Fig. 4 is a partially enlarged view of a portion a in fig. 2.

In the figure: the sealing structure comprises a shell 1, a first annular stepped surface 100, a second annular stepped surface 101, a lower annular boss 102, a central through hole 2, a rotating shaft 3, an upper annular boss 30, a convex ring 31, an end cover 4, a bearing 5, an isolation sealing ring 6, a connecting pipe 7, a graphite support ring 8, an annular gap 9, a sealing filler 10, a pressing ring 11, a retainer ring 12, a pressure spring 13, a lower sealing ring 14 and an upper sealing ring 15.

Detailed Description

The utility model is further described with reference to the accompanying drawings and the detailed description below:

as shown in fig. 1-4, a high temperature resistant rotary joint comprises a housing 1, a central through hole 2 is provided in the housing 1, a hollow rotating shaft 3 is provided in the central through hole, an end cap 4 is provided at the upper end of the housing, a bearing 5 is provided in the end cap, an isolating seal ring 6 is provided between the inner hole of the end cap 5 and the outer wall of the rotating shaft 3, the upper end of the rotating shaft 3 passes through the bearing and extends out of the housing, the lower end of the housing 1 extends to form a connecting pipe 7, a first annular step surface 100 is provided at the hole wall of the lower end of the housing 1, a second annular step surface 101 is provided on the first annular step surface 100, a graphite support ring 8 is provided between the lower end of the rotating shaft 3 and the second annular step surface 101, a lower annular boss 102 protruding upward is provided at the inner diameter of the second annular step surface 101, an upper annular boss 30 protruding downward is provided at the inner diameter of the lower end of the rotating shaft 3, and an annular gap 9 is formed between the rotating shaft and the central through hole, the annular gap is filled with a sealing filler 10, a compression ring 11 is sleeved at the upper end of the annular gap on the rotating shaft, the lower end surface of the compression ring is in a wedge shape, a check ring 12 is arranged at the upper end of the compression ring, and a compression spring 13 is arranged between the check ring and the end cover; the outer side of the lower end of the rotating shaft 3 is provided with a convex ring 31, the outer surface of the convex ring 31 is a cambered surface, the lower side of the convex ring 31 is provided with a lower sealing ring 14, the upper side of the convex ring is provided with an upper sealing ring 15, and the upper sealing ring and the lower sealing ring are both graphite sealing rings.

The principle of the utility model is as follows with reference to the attached drawings: the lower end of the rotating shaft and the first annular step surface support are supported by a graphite support ring, and the lower end of the rotating shaft abuts against the graphite support ring under the action of a pressure spring, so that the sealing effect is achieved, and the smooth rotation of the rotating shaft can be guaranteed; the annular gap between the rotating shaft and the central through hole is filled with the sealing filler and is always compressed by the compression ring, and the rotating shaft can keep good sealing performance even if being influenced by thermal barrier contraction for a long time.

The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made based on the present invention to solve the same technical problems and achieve the same technical effects are within the scope of the present invention.

Claims

1. The utility model provides a high temperature resistant rotary joint, includes the casing, is equipped with central through-hole in the casing, is equipped with hollow pivot in the central through-hole, and the upper end of casing is equipped with the end cover, is equipped with the bearing in the end cover, the upper end of pivot is passed outside the bearing stretches out the casing, and the lower extreme of casing extends and forms the connecting pipe, characterized by, the lower extreme pore wall department of casing is equipped with first annular ladder face, is equipped with second annular ladder face on the first annular ladder face, be equipped with the graphite support ring between the lower extreme of pivot and the second annular ladder face, form annular gap between pivot and the central through-hole, the annular gap intussuseption is filled with sealing filler, the upper end department cover that lies in annular gap in the pivot is equipped with the clamping ring, the upper end of clamping ring is equipped with the retaining ring, be equipped with the pressure spring between retaining ring and the end cover.

2. The high-temperature resistant rotary joint according to claim 1, wherein a convex ring is arranged on the outer side of the lower end of the rotating shaft, the outer surface of the convex ring is a cambered surface, a lower sealing ring is arranged on the lower side of the convex ring, an upper sealing ring is arranged on the upper side of the convex ring, and the upper sealing ring and the lower sealing ring are both graphite sealing rings.

3. A high temperature resistant rotary joint as claimed in claim 1 or 2, wherein the lower end surface of the pressure ring is wedge-shaped.

4. A high temperature resistant rotary joint as claimed in claim 1, wherein the second annular step surface has a lower annular projection projecting upward at an inner diameter, and the rotary shaft has an upper annular projection projecting downward at a lower inner diameter.

5. A high temperature resistant rotary joint as set forth in claim 1 wherein an isolating seal ring is disposed between the inner bore of said end cap and the outer wall of the shaft.