CN212361161U

CN212361161U - End face sealing structure for rotary compensator and rotary compensator

Info

Publication number: CN212361161U
Application number: CN202021109030.3U
Authority: CN
Inventors: 尹明华; 朱爱春; 王荣; 吴秀华; 蓸广金; 洪亮; 洪磊; 黄志娟
Original assignee: Jiangsu Better Pipe Fitting Co ltd
Current assignee: Jiangsu Better Pipe Fitting Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-01-15
Anticipated expiration: 2030-06-16

Abstract

The utility model relates to a rotary compensator is with terminal surface seal structure and adopt rotary compensator of this structure. The end face sealing structure for the rotary compensator comprises an annular inner boss (9) arranged on the inner surface of an outer sleeve (6) and a sealing filler (7) arranged between a sealing pressing flange (5) and the annular inner boss (9), an annular groove is formed in one surface, adjacent to the sealing filler (7), of the annular inner boss (9), and a sealing anti-compression ring (8) is installed in the annular groove. The utility model discloses can effectively delay sealing material ablation volume under high temperature, reduce the loss of rotary compensator sealing material in the fit-up gap under operating condition, and sealed effect has showing and improves.

Description

End face sealing structure for rotary compensator and rotary compensator

Technical Field

The utility model relates to a rotary compensator is with terminal surface 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 effectively delay the ablation volume of sealing material under high temperature, reduced the loss of rotary compensator sealing material in fit-up gap under operating condition, the utility model provides a rotary compensator is with end face seal structure and rotary compensator of better sealing performance.

End face seal structure for rotary compensator is including setting up the annular inner boss on the outer sleeve pipe internal surface, setting up the sealing filler between sealed flange and the annular inner boss, and the annular inner boss is opened with the adjacent one side of sealing filler has an annular groove, installs sealed compression ring in the aforementioned annular groove.

Rotary compensator has adopted aforementioned end face seal structure, including inner tube, outer tube, reducing pipe, sealed hold-down flange, the one end of inner tube stretches into in the outer tube, sealed hold-down 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 the outer boss of annular on the surface of inner tube, it is equipped with the packings to stretch into between the one end of outer tube at annular inner boss and sealed hold-down flange, be provided with slider or end face seal spare in the cavity that forms between the outer boss of annular and the annular inner boss, it has the annular groove to open on the inner wall of the adjacent one side of annular inner boss and packings, install sealed compression ring in the aforementioned annular.

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 sliding member is a ball or a sliding ring.

The utility model discloses an offer the annular groove in the annular on the inner wall of the adjacent one side of boss and seal packing, and install sealed compression ring in this annular groove, and make sealed compression ring and inner tube laminating, fill the fitting gap between inner tube and the outer tube, thereby isolated or reduce the contact of air and seal packing, delay the ablation volume of seal packing under high temperature effectively, the loss of seal material from the fitting gap under operating condition of rotary compensator has been reduced, reduce the washing away of medium to seal packing under the intraductal pressure order about, thereby guarantee rotary compensator's sealing performance.

Drawings

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

Fig. 2 is an enlarged view of a part (B) of embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram 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 and pressing flange, 6 is an outer sleeve, 7 is a sealing filler, 8 is a sealing compression ring, 9 is an annular inner boss, 10 is a sliding part, 11 is an annular outer boss, 12 is a limiting block, 13 is a reducer pipe, and 14 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 and other 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 and 2, in the rotation compensator of the present embodiment, an inner tube 1, an outer sleeve 6, a reducer 13, and a sealing and pressing flange 5 are provided, wherein 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, and the inner tube 1, the outer sleeve 6, and the sealing and pressing flange are connected through a screw 2, a nut 3, and a gasket 4. The inner surface of the outer sleeve 6 is provided with an annular inner boss 9, the outer surface of the inner tube 1 is provided with an annular outer boss 11, a sealing filler 7 is arranged between the annular inner boss 9 and one end, extending into the outer sleeve 6, of the sealing pressing flange 5, a sliding piece 10 is arranged in a cavity formed between the annular outer boss 11 and the annular inner boss 9, an annular groove is formed in the inner wall of one side, adjacent to the sealing filler 7, of the sealing pressing flange 5, a sealing compression ring 9 is installed in the annular groove, the sealing compression ring 9 is full of the annular groove and is attached to the inner tube 1, and an assembly gap between the inner tube 1 and the outer sleeve 6 is filled.

In order to prevent the product from dislocating in the opposite direction in the process of engineering installation and prevent the sliding part 10 arranged between the inner and outer annular bosses from shifting, a limiting block 12 is arranged in the reducer pipe 13.

In the present embodiment, the sliding member 10 is a ball.

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 7, 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 14 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 present embodiment, an end face seal is disposed in the cavity formed between the annular outer boss and the annular inner boss instead of the sliding member 10, and the end face seal is made of a flexible material such as graphite, which can further ensure the sealing performance of the rotary compensator.

Claims

1. The end face sealing structure for the rotary compensator comprises an annular inner boss (9) arranged on the inner surface of an outer sleeve (6) and a sealing filler (7) arranged between a sealing pressing flange (5) and the annular inner boss (9), and is characterized in that an annular groove is formed in one surface, adjacent to the sealing filler (7), of the annular inner boss (9), and a sealing anti-compression ring (8) is installed in the annular groove.

2. The utility model provides a rotary compensator, including inner tube (1), outer tube (6), reducing pipe (13), sealed flange (5) compress tightly, the one end of inner tube (1) stretches into in outer tube (6), sealed flange (5) suit is on inner tube (1), its one end stretches into in outer tube (6), be equipped with annular inner boss (9) on the internal surface of outer tube (6), be equipped with annular outer boss (11) on the surface of inner tube (1), be equipped with between the one end that outer tube (6) were stretched into in annular inner boss (9) and sealed flange (5) and seal packing (7), be provided with slider (10) or end face seal spare in the cavity that forms between annular outer boss (11) and the annular inner boss, its characterized in that: an annular groove is formed in the inner wall of the surface, adjacent to the sealing filler (7), of the annular inner boss (9), and a sealing compression ring (8) is installed in the annular groove.

3. Rotational compensator according to claim 2, characterized in that the outer sleeve (6) and the reducer pipe (13) are of one-piece, one-piece construction.

4. A rotary compensator according to claim 2, characterized in that the outer sleeve (6) is provided with a sealing packing filling device (14).

5. A rotary compensator according to claim 2, characterized in that a stop block (12) is arranged in the reducer pipe (13).

6. Rotational compensator according to claim 2, characterized in that the slide (10) is a ball or a sliding ring.