WO2021047669A1

WO2021047669A1 - Combined multi-end-face sealing rotary compensator

Info

Publication number: WO2021047669A1
Application number: PCT/CN2020/115047
Authority: WO
Inventors: 潘文浩
Original assignee: 江苏永力管道有限公司
Priority date: 2019-09-14
Filing date: 2020-09-14
Publication date: 2021-03-18
Also published as: CN110657308A

Abstract

A combined multi-end-face sealing rotary compensator, comprising a rotary seat (3), a rotary core pipe (1), and a packing gland (2). Sealing packing is provided in a sealing cavity; an inner convex ring (32) is provided on the inner wall of the rotary seat (3), a step-shaped outer boss (11) is provided at the right end of the rotary core pipe (1), and an assembling gap between the outer boss (11) and the inner convex ring (32) is located in the middle of the bottom of the sealing cavity. The outer boss (11) of the rotary core tube (1) is provided with at least two steps, and an end face sealing ring (6) is embedded between the side face of each step and the inner convex ring (32). A multi-stage end face sealing ring is provided between the outer boss of the rotary core pipe and the inner convex ring of an outer sleeve, and the sealing ring has a positive correlation self-sealing effect along with the change of pressure of a medium in a pipeline, so that the sealing effect is enhanced. The compensator has strong high-temperature resistance and high-pressure resistance, a good sealing effect, a long service life, and convenience in mounting.

Description

Combined multi-channel end face seal rotary compensator

Technical field

The invention relates to the technical field of pipeline compensators, in particular to a combined multi-channel end face seal rotary compensator.

Background technique

Pipeline compensators generally need to use sealing packing to keep the pipeline sealed and prevent medium leakage. The existing sleeve compensator compensates for the displacement of the pipeline through the expansion and contraction of the sliding core tube, and the seal between the sliding core tube and the packing cannot be maintained in a good state for a long time, and leakage is likely to occur after long-term use. A sealed packing cavity is arranged between the inner and outer pipes of the rotating compensator, and the sealed packing is installed in the sealed cavity, and the packing is compressed by the packing gland to achieve sealing. The matching clearance between the rotating parts of the rotating compensator is large, and the relative rotation stability of the inner and outer pipes is poor due to the thrust of the pipeline, and it is easy to produce eccentric deflection of different shafts, which increases the rotation resistance. After a period of use, the sealing performance of the sealing packing will be affected, resulting in sealing failure and leakage. If it is discovered and maintained not in time, it may even cause safety production accidents.

The existing pipeline compensator generally uses graphite packing or asbestos packing as the sealing filler, which has a better sealing effect under ordinary working conditions. For pipelines that transport high-temperature and high-pressure media, due to the inevitable assembly gap of the pipeline compensator and the low strength of traditional seal packing, coupled with the effect of high-temperature and high-pressure media, the deflection and displacement process of the packing material in the compensator Medium loss is greater. On the other hand, the assembly gap of the traditional pipeline compensator is usually designed to be close to the outer surface of the inner core tube. During the working process, the medium will penetrate to the root of the sealing packing along the assembly gap and accelerate the loss and blowing of the sealing packing. Such a design is more likely to cause the failure of the "labyrinth effect" that prevents the leakage of the medium, resulting in large loss of the sealing packing of the compensator, easy leakage, and service life.

Summary of the invention

The purpose of the present invention is to provide a combined multi-channel end face seal rotary compensator with strong high temperature resistance and high pressure performance, good sealing effect, flexible operation, long service life and convenient installation.

The purpose of the present invention is achieved by adopting the following technical solutions:

Combined multi-channel end face seal rotating compensator, including rotating seat, rotating core tube and packing gland, the rotating core tube is sleeved in the rotating seat, the end surface of the packing gland and the inner surface of the rotating seat, and the outer surface of the rotating core tube The packing seal cavity is formed, and the seal packing is provided in the seal cavity. The inner wall of the rotating seat is provided with an inner convex ring. The right end of the rotating core tube is provided with a stepped outer convex platform that matches with the inner convex ring. The assembly gap formed between the boss and the inner convex ring is located in the middle of the bottom of the sealing cavity; the outer boss of the rotating core tube is provided with at least two steps, and the side of the step is embedded between the opposite surface of the inner convex ring Face seal ring.

As a preferred technical solution of the present invention, the sealing packing includes a pressure-changeable metal ring and a non-metallic flexible packing. The pressure-changeable metal ring is radially expanded and deformed under the action of an external force, so that the inner and outer sides of the seal are in contact with the sealed cavity. The sidewalls of the tube are tightly matched; at the same time, the pressure-changeable metal ring is tightly combined with the non-metal flexible packing to achieve a sealing effect.

As a preferred technical solution of the present invention, the pressure-changeable metal ring is formed by bending a metal hollow tube, or formed by bending a metal sheet with a semicircular, arc, or V-shaped cross section; the metal hollow tube includes a hollow round tube Or oval hollow tube.

As a preferred technical solution of the present invention, the pressure-changeable metal ring includes a closed metal ring or a C-shaped metal ring with one side open.

As a preferred technical solution of the present invention, the sealing packing includes at least two laminated metal rings and two layers of non-metallic flexible packing. Flexible packing, second pressure-changeable metal ring, second non-metallic flexible packing.

As a preferred technical solution of the present invention, the first pressure-changeable metal ring is formed by bending a metal hollow tube, and the second pressure-changeable metal ring is formed by bending an arc-shaped or V-shaped metal sheet.

As a preferred technical solution of the present invention, the first pressure-changeable metal ring is a closed metal ring welded by a port, and the second pressure-changeable metal ring is a C-shaped metal ring with an opening on one side.

As a preferred technical solution of the present invention, the pressure-changeable metal ring is a copper ring or an aluminum alloy ring, and the non-metal flexible filler is graphite packing or asbestos packing.

As a preferred technical solution of the present invention, the outer boss of the rotating core tube is provided with three steps of upper, middle, and lower, and the end face seal rings respectively embedded between the sides of the upper and middle steps and the opposite faces of the inner convex ring are Metal plane sealing ring; the right end surface of the rotating core tube is set as an arc surface.

As a preferred technical solution of the present invention, the rotating seat is an integrally formed diameter reducing tube with a whole structure, the left end of the rotating seat is provided with a left flange, and the right end of the rotating seat is provided with a tapered tube whose diameter gradually shrinks and decreases. The cover and the left flange are connected and fixed by bolt and nut components.

The beneficial effect of the present invention is that compared with the prior art, the present invention adopts a soft and easy-stretchable compression-changeable metal ring and a non-metallic flexible filler to be compressed under the action of an external force to form a composite sealing structure, so that the metal ring and the flexible filler are The radial expansion is achieved, and the edges on both sides of the inner and outer sides are closely matched with the side wall of the sealed cavity; at the same time, a multi-stage end face metal seal ring is embedded between the outer boss of the rotating core tube and the inner convex ring of the outer sleeve, and the multi-stage end face seal ring It can form a positive correlation self-sealing effect with the change of the pressure of the pipeline medium, so as to further enhance the sealing effect.

When the compensator is working, the multi-stage end face sealing ring and the pressure-changeable metal ring can block the direct contact between high temperature and high pressure medium and the flexible sealing packing, effectively reducing the loss of the flexible packing, and at the same time achieving the effect of extending the service life of the sealing packing and strengthening the seal. The multi-stage metal sealing ring forms an end face seal under pressure, with low friction and good sealing effect, which is beneficial to the flexible operation of the compensator. It not only forms the end face seal, but also plays the role of anti-falling and anti-friction.

The invention has strong high temperature resistance and high pressure performance, good sealing effect, high pressure bearing strength, long service life and convenient installation. It is especially suitable for high temperature and high pressure heat pipe network, safe and reliable to use, and is conducive to energy saving and environmental protection.

Description of the drawings

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

In the picture: 1. Rotating core tube, 2. Packing gland, 3. Rotating seat, 4. Bolt and nut assembly, 5. Pressure-changeable metal ring, 6. End face seal ring, 7. Non-metallic flexible packing, 11. Outer Boss, 31, left flange, 32, inner convex ring, 33, tapered tube.

detailed description

The present invention will be further explained below in conjunction with the drawings and specific embodiments:

As shown in Figure 1, the combined multi-channel end face seal rotating compensator includes a rotating seat 3, a rotating core tube 1 and a packing gland 2. The rotating core tube 1 is sleeved in the rotating seat 3, and the end face of the packing gland 2 is connected to The inner surface of the rotating seat 3 and the outer surface of the rotating core tube 1 constitute a packing seal cavity, which is provided with a sealing packing. The inner wall of the rotating seat 3 is provided with an inner convex ring 32, and the right end of the rotating core tube 1 is provided with and The stepped outer boss 11 matched with the inner convex ring 32, the assembly gap formed between the outer boss 11 and the inner convex ring 32 is located in the middle of the bottom of the sealed cavity; the outer convex of the rotating core tube 1 The platform 11 is provided with at least two steps, and an end face sealing ring 6 is embedded between the side surface of the step and the opposite surface of the inner convex ring 32.

In this embodiment, the sealing packing includes a pressure-changeable metal ring 5 and a non-metallic flexible packing 7. The pressure-changeable metal ring 5 generates radial expansion and deformation under the action of an external force, so that the inner and outer sides of the sealing cavity are in contact with each other. At the same time, the pressure-changeable metal ring 5 and the non-metal flexible packing 7 are tightly combined to achieve a sealing effect. The pressure-changeable metal ring 5 is formed by bending a metal hollow tube, or by bending a metal sheet with a semicircular, arc, or V-shaped cross section; the metal hollow tube includes a hollow round tube or an elliptical hollow tube. The pressure-changeable metal ring 5 includes a closed metal ring or a C-shaped metal ring with one side open.

The sealing packing in this embodiment includes at least two laminated modified metal rings 5 and two layers of non-metallic flexible packing 7. The first pressure-changing metallic ring is arranged at the bottom of the sealed cavity, and then the first non-metallic flexible packing, The second pressure-changeable metal ring and the second non-metallic flexible packing. The first pressure-changeable metal ring is formed by bending a metal hollow tube, and the second pressure-changeable metal ring is formed by bending an arc-shaped or V-shaped metal sheet. The first pressure-changeable metal ring is a closed metal ring welded by ports, and the second pressure-changeable metal ring is a C-shaped metal ring with one side open. The pressure-changeable metal ring 5 is a copper ring or an aluminum alloy ring, and the non-metallic flexible packing 7 is graphite packing or asbestos packing.

The outer boss 11 of the rotating core tube 1 of this embodiment is provided with three steps, upper, middle, and lower. An end face seal ring 6 is embedded between the sides of the upper step and the middle step and the opposite face of the inner convex ring 32, respectively. 6 is a copper plane ring or an aluminum alloy plane ring. The right end surface of the rotating core tube 1 is set as an arc-shaped surface, the rotating seat 3 is an integrated thermoformed integral structure reducing tube, the left end of the rotating seat 3 is provided with a left flange 31, and the right end of the rotating seat 3 is provided with a gradually shrinking diameter Reduced conical tube; the packing gland 2 and the left flange 31 are connected and fixed by the bolt and nut assembly 4.

The above-mentioned embodiments are only to illustrate the concept and technical features of the present invention, and their purpose is to let those skilled in the art understand the technical solutions and implementation manners of the invention, and cannot limit the protection scope of the present invention accordingly. All equivalent replacements or equivalent changes made according to the technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

A combined multi-channel end face seal rotary compensator, comprising a rotary seat, a rotary core tube and a packing gland. The rotary core tube is sleeved in the rotary seat. The end face of the packing gland and the inner surface of the rotary seat and the rotating core tube The outer surface constitutes a packing seal cavity, and the seal packing is provided in the seal cavity. It is characterized in that: the inner wall of the rotating seat is provided with an inner convex ring, and the right end of the rotating core tube is provided with a stepped outer ring that matches the inner convex ring. A boss, the assembly gap formed between the outer boss and the inner convex ring is located in the middle of the bottom of the sealed cavity;

The outer boss of the rotating core tube is provided with at least two steps, and an end face sealing ring is embedded between the side surface of the step and the opposite surface of the inner convex ring.
The combined multi-channel end face seal rotary compensator according to claim 1, wherein the sealing packing includes a pressure-changeable metal ring and a non-metal flexible packing, and the pressure-changeable metal ring produces radial expansion under the action of external force. And deformation, so that the inner and outer sides of the seal are in close fit with the side wall of the sealed cavity; at the same time, the pressure-changeable metal ring is tightly combined with the non-metallic flexible packing, so as to achieve the sealing effect.
The combined multi-channel end face seal rotary compensator according to claim 2, characterized in that: the pressure-changeable metal ring is formed by bending a metal hollow tube, or is made of a semicircular, arc, or V-shaped metal cross section. The sheet is formed by bending; the metal hollow tube includes a hollow round tube or an elliptical hollow tube.
The combined multi-channel end face seal rotary compensator according to claim 2, wherein the pressure-changeable metal ring comprises a closed metal ring or a C-shaped metal ring with an opening on one side.
The combined multi-channel end face seal rotary compensator according to claim 2, characterized in that: the sealing packing includes at least two laminated variable metal rings and two layers of non-metallic flexible packing, and the first pressure variable metal ring is provided with At the bottom of the sealed cavity, there are the first non-metallic flexible packing, the second pressure-changeable metal ring, and the second non-metallic flexible packing in sequence.
The combined multi-channel end face seal rotary compensator according to claim 5, characterized in that: the first pressure-changeable metal ring is formed by bending a metal hollow tube, and the second pressure-changeable metal ring is formed by an arc or V-shape. The metal sheet is bent.
The combined multi-channel end face seal rotary compensator according to claim 6, characterized in that: the first pressure-changeable metal ring is a closed metal ring welded by ports, and the second pressure-changeable metal ring is open on one side C-shaped metal ring.
The combined multi-channel end face seal rotary compensator according to any one of claims 2 to 7, characterized in that: the pressure-changeable metal ring is a copper ring or an aluminum alloy ring, and the non-metallic flexible packing is a graphite packing Or asbestos packing.
The combined multi-channel end face seal rotary compensator according to claim 1, characterized in that: the outer boss of the rotating core tube is provided with an upper, a middle, and a lower three steps, and the sides of the upper and the middle steps and the inner convex ring The end surface seal rings respectively embedded between the opposite surfaces are metal plane seal rings; the right end surface of the rotating core tube is set as an arc surface.
The combined multi-channel end face seal rotary compensator according to claim 1, characterized in that: the rotary seat is an integrally formed integral structure reducing tube, the left end of the rotary seat is provided with a left flange, and the right end of the rotary seat is provided with a diameter The tapered tube with gradually reduced shrinkage is connected and fixed between the packing gland and the left flange through a bolt and nut assembly.