CN212361163U

CN212361163U - Rotary compensator end face sealing structure and rotary compensator

Info

Publication number: CN212361163U
Application number: CN202021178811.8U
Authority: CN
Inventors: 洪亮; 洪磊; 尹明华; 朱爱春; 王荣; 吴秀华; 曹广金; 黄志娟
Original assignee: Jiangsu Better Pipe Fitting Co ltd
Current assignee: Jiangsu Better Pipe Fitting Co ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-01-15
Anticipated expiration: 2030-06-23

Abstract

The utility model relates to a rotary compensator end face seal structure and adopt rotary compensator of this structure. Rotary compensator end face seal structure, including inner tube (1), sealed hold-down flange (5) and outer tube (6), outer tube (6) supply to open on the inner wall of inner tube (1) male one end tip one end, are provided with annular seal (14) in annular groove (16) to fixed by suit on sealed hold-down flange (5), be located sealed clamping ring (15) in outer tube (6) annular groove outside. The utility model discloses can effectively delay the thermal weightlessness (ablation volume) of sealing filler graphite under the high temperature, effectively prevent rotary compensator because of using the sealing material for a long time to wash the loss in the assembly gap between follow outer tube and the sealed flange down at the medium, sealed effect has showing the improvement.

Description

Rotary compensator end face sealing structure and rotary compensator

Technical Field

The utility model relates to a rotary compensator end face seal structure and rotary compensator.

Background

At present, rotary compensators are increasingly widely used in heat pipelines. The rotary compensator has the advantages of high safety performance, convenience in design, large compensation amount, high economical efficiency of pipeline operation, diversified installation modes and types and the like, and is a product which is preferred by design houses and application units such as thermal power plants and the like. The main technical core of the rotary compensator lies in the sealing technology, and although people are always improving the sealing performance of the rotary compensator, the rotary compensator still has the possibility of leakage in the working process, and the reasons for the leakage are as follows:

1. ablation in an aerobic state at high temperature.

The rotary compensator operates at a high temperature for a long time, and the ablation amount of the sealing material (graphite, etc.) in a high-temperature aerobic state is reduced in volume due to contact with oxygen, thereby causing leakage. Therefore, controlling the amount of contact between the sealing filler and oxygen is one of the most important means for ensuring long-term sealing.

2. The filler is worn during operation.

The inner pipe and the outer sleeve of the rotary compensator cannot be absolutely smooth (namely, the friction coefficient is 0), so that the packing is abraded due to the relative rotation of the inner pipe and the outer sleeve when the rotary compensator works, part of the packing is easily lost from an assembly gap due to the fact that the packing is broken into pieces and powder, the volume of the packing in a sealing cavity is reduced, the sealing pressing force is reduced, and leakage occurs.

3. Wear from oxidation of the seal cavity surfaces.

After the rotary compensator is used for a long time, under the influence of medium adverse factors (such as chloride ions, humidity and temperature) in a pipeline, a contact surface of a sealing cavity and a sealing material is corroded to form unevenness, and the packing is easily abraded under the working state of the rotary compensator, so that part of the sealing packing is in a fragment powder state and is easily lost from an assembly gap, the volume of the packing in the sealing cavity is reduced, the sealing pressing force is reduced, and leakage is caused.

4. The chemical reaction of the seal packing with the media (high temperature steam, high temperature hot water, etc.) is lost.

Because the medium can react with the sealing filler at high temperature (for example, C + H)₂O (high temperature) ═ CO + H₂) The solid volume of the sealing filler is reduced, the sealing performance is reduced, and leakage is easy to occur.

5. And (5) scouring the sealing packing by the medium under a high-pressure state.

Under the working condition, the medium in the high-temperature and high-pressure state in the rotary compensator easily enters the sealing cavity from the assembly gap to form strong impact force on the sealing filler, and the sealing filler can be lost under the flushing of the high-temperature and high-pressure medium after long-term use, so that the sealing performance is reduced.

Therefore, it is an objective of those skilled in the art to further improve the sealing performance of the rotary compensator.

Disclosure of Invention

In order to delay the loss of heat under the high temperature (ablation volume) of sealing filler graphite, prevent that rotary compensator from using the loss in the assembly clearance between sealing material from outer tube and the sealed hold-down flange under the medium is washd because of long-term, the utility model provides a rotary compensator is with seal structure and rotary compensator with better sealing performance.

Rotary compensator seal structure includes inner tube, sealed flange and outer tube, and it has one annular groove to open on the outer tube supplies inner tube male one end tip inner wall, is provided with annular seal spare in the annular groove to fixed by the suit on sealed flange, the sealed clamping ring that is located the outer tube annular groove outside.

Rotary compensator has adopted aforementioned end face seal structure, including the inner tube, the outer tube, the reducing pipe, sealed flange, the outer tube suit is on the inner tube, the one end of inner tube stretches into in the outer tube, sealed flange suit is on the inner tube, its one end stretches into in the outer tube, be equipped with annular inner boss on the internal surface of outer tube, be equipped with annular outer boss on the surface of inner tube, be provided with slider or end face seal spare between annular inner boss and the outer boss of annular, it is equipped with the packings to stretch into between the one end of outer tube at annular inner boss and sealed flange, outer tube supplies to open on the inner wall of inner tube male one end tip to have one annular groove, be provided with annular seal spare in the annular groove, and by the suit on sealed flange, it is fixed to be located the sealed clamping ring in.

Furthermore, the sealing press ring is connected with the outer sleeve through a fastener.

In order to solve the potential safety hazard problem caused by the butt joint of the outer sleeve and the reducer pipe in a welding mode, the outer sleeve and the reducer pipe are of an integrally formed integrated structure.

In order to avoid the sealing filler from generating a gap due to normal abrasion in long-term use so as to influence the sealing performance of the whole rotary compensator, the outer sleeve is provided with a sealing filler filling device.

In order to prevent the product from dislocating in the opposite direction in the engineering installation process and prevent the sliding piece or the end face sealing piece arranged between the inner ring-shaped boss and the outer ring-shaped boss from shifting, a limiting block is arranged in the reducer pipe.

The utility model discloses a set up the annular groove and set up annular seal spare in this annular groove on the outer tube supplies inner tube male one end tip inner wall, because this annular seal spare closely laminates sealed flange, the assembly gap between outer tube and sealed flange that compresses tightly has effectively been filled, it is sealed together to form, thereby isolated air, effectual loss of heat weightlessness (ablation volume) of delaying the packing graphite under high temperature, effectively prevent rotary compensator because of long-term use sealing material from the loss in the assembly gap between outer tube and the sealed flange under the medium scouring, sealed effect is showing and is improving.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is an enlarged view of a part (E) of the present invention.

Fig. 3 is a schematic structural view of embodiment 2 of the present invention.

In fig. 1-3, 1 is an inner tube, 2 is a stud, 3 is a nut, 4 is a gasket, 5 is a sealing hold-down flange, 6 is an outer sleeve, 7 is a sealing filler, 8 is an annular inner boss, 9 is a sliding member, 10 is an annular outer boss, 11 is a stopper, 12 is a reducer, 13 is a fastener, 14 is an annular sealing member, 15 is a sealing press ring, 16 is an annular groove, and 17 is a filling device.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, detailed descriptions of embodiments of the present invention are provided below with reference to the accompanying drawings, so that the above objects, features and advantages of the present invention will be more clear. The drawings are not intended to be to scale, emphasis instead being placed upon illustrating the principles of the embodiments.

Example 1

As shown in fig. 1-2, the rotary compensator of this embodiment includes an inner tube (1), an outer sleeve (6), a reducer (12), and a sealing and pressing flange (5), wherein the outer sleeve (6) is sleeved on the inner tube (1), one end of the inner tube (1) extends into the outer sleeve (6), the sealing and pressing flange (5) is sleeved on the inner tube (1), and one end of the sealing and pressing flange extends into the outer sleeve (6). The outer sleeve (6) and the reducer pipe (12) are of an integrated structure which is formed integrally. The inner surface of an outer sleeve (6) is provided with an annular inner boss (8), the outer surface of an inner pipe (1) is provided with an annular outer boss (10), a sliding piece (9) is arranged between the annular inner boss (8) and the annular outer boss (10), a sealing filler (7) is arranged between the annular inner boss (8) and one end, extending into the outer sleeve (6), of a sealing pressing flange (5), the inner wall of the end part, inserted into the inner pipe (1), of the outer sleeve (6) is provided with an annular groove (16), an annular sealing piece (14) is arranged in the annular groove (16), and the annular sealing piece (14) is fixed by a sealing pressing ring (15) which is sleeved on the sealing pressing flange (5) and is positioned outside the annular groove (16) of the outer sleeve through a fastener (13). The annular sealing element (14) is tightly attached to the sealing and pressing flange, and fills an assembly gap between the outer sleeve (6) and the sealing and pressing flange (5) to form a seal.

In the present embodiment, the sliding member 9 is a sliding ring, but a conventional ball may be used as the sliding member.

Example 2

As shown in fig. 3, the basic structure of the present embodiment is the same as that of embodiment 1, except that:

in order to keep good sealing performance, 4-30 injection ports are uniformly distributed on the outer sleeve 6 along the same circumference at the position corresponding to the sealing filler 8, a radial through hole arranged in each injection port is communicated with a transverse hole at the waist part, the outer end of each radial through hole is provided with a screw plug with a hole, and the screw plug arranged in the transverse hole traverses the radial through hole to form a sealing filler filling device 17 of a valve structure. When the rotary compensator is used, if the sealing performance is reduced and leakage occurs, the screw plug arranged at the outer end of the injection opening can be removed on line, then the screw plug in the transverse hole is rotated, the hole on the screw plug is communicated with the radial through hole, and the injection opening is supplemented with sealing filler by using a pressure gun. After the supplement is finished, firstly screwing the screw plug in the transverse hole, then pulling out the pressure gun, and then reinstalling the screw plug at the outer end of the inlet. Therefore, the sealing performance of the rotary compensator can be timely recovered by replenishing the sealing filler on line.

In the embodiment, the sliding member 9 is replaced by an end face seal in the cavity formed between the annular outer boss 10 and the annular inner boss 8, and the end face seal is made of flexible materials such as graphite, so that the sealing performance of the rotary compensator can be further ensured.

Claims

1. The utility model provides a rotary compensator end face seal structure, includes inner tube (1), sealed hold-down flange (5) and outer tube (6), and its characterized in that outer tube (6) supply to open on the one end tip inner wall that inner tube (1) inserted has an annular groove (16), is provided with annular seal (14) in annular groove (16) to fixed by suit on sealed hold-down flange (5), be located outer tube (6) annular groove outside sealed clamping ring (15).

2. A rotary compensator end face seal according to claim 1, characterized in that the sealing collar (15) is connected to the outer sleeve (6) by fasteners (13).

3. A rotary compensator comprises an inner tube (1), an outer sleeve (6), a reducer pipe (12) and a sealing and pressing flange (5), wherein the outer sleeve (6) is sleeved on the inner tube (1), one end of the inner tube (1) extends into the outer sleeve (6), the sealing and pressing flange (5) is sleeved on the inner tube (1), one end of the sealing and pressing flange extends into the outer sleeve (6), an annular inner boss (8) is arranged on the inner surface of the outer sleeve (6), an annular outer boss (10) is arranged on the outer surface of the inner tube (1), a sliding piece (9) or an end face sealing piece is arranged between the annular inner boss (8) and the annular outer boss (10), a sealing filler (7) is arranged between the annular inner boss (8) and one end of the sealing and pressing flange (5) extending into the outer sleeve (6), and is characterized in that an annular groove (16) is formed on the inner wall of one end part of the outer sleeve (6), an annular sealing element (14) is arranged in the annular groove (16) and is fixed by a sealing press ring (15) which is sleeved on the sealing press flange (5) and is positioned outside the annular groove of the outer sleeve (6).

4. A rotary compensator according to claim 3, characterized by the sealing collar (15) being connected to the outer sleeve (6) by fasteners (13).

5. A rotary compensator according to claim 3, characterized in that the outer sleeve (6) is provided with a sealing packing filling device (17).

6. A rotary compensator according to claim 3, characterized by a stop block (11) arranged in the reducer pipe (12).

7. A rotary compensator according to claim 3, characterized in that the outer sleeve (6) and the reducer (12) are of one-piece integral construction.