CN106402562A - Air pressure type sleeve compensator - Google Patents

Abstract

The invention provides a pneumatic sleeve compensator, comprising: a pipe inner sleeve and a pipe outer sleeve. There are two grooves as sealing seats on the top, which are respectively the main sealing seat and the auxiliary sealing seat, and a sealing material is placed in each sealing seat; the main sealing seat is connected to the external air source through the first pipeline; the auxiliary sealing seat The sealing seat is connected to the backup air source through the second pipeline; a spring is arranged in the first pipeline, and one end of the spring is connected to a trigger switch, and the trigger switch is connected to the solenoid valve set on the second pipeline through the solenoid valve control line; The invention utilizes gas pressure to realize the sealing between the sealing material and the inner and outer casing of the pipeline, and the sealing pressure can be adjusted, which expands the applicable pressure range of the device. In addition, the device adopts an inner concave structure to place the sealing material so that it will not be displaced or fall off.

Description

Pneumatic sleeve compensator

technical field

The invention relates to the technical field of machinery, in particular to a pneumatic sleeve compensator.

Background technique

Traditional expansion joints include sleeve expansion joints, corrugated expansion joints, square natural compensation expansion joints, etc. Their main functions are: 1. Compensate and absorb the expansion and contraction deformation caused by axial, lateral and angular heating of the pipeline. 2. Absorb equipment vibration and reduce the impact of equipment vibration on pipelines. 3. Absorb the deformation of pipelines caused by earthquakes and ground subsidence, 4. Installation of closed pipeline systems, etc. Affected by thermal expansion and other factors, existing pipelines have a certain amount of displacement in both the axial and radial directions. Traditional expanders can compensate for these displacements, but the structure is complex, the applicable pressure level cannot be adjusted, the radial displacement is small, and it is easy to age.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned defects in the prior art, and provide a pneumatic sleeve compensator with simple structure and excellent sealing performance even when the radial displacement is large during installation.

A pneumatic sleeve compensator, comprising: a pipe inner sleeve and a pipe jacket, the pipe inner sleeve is installed in the pipe jacket, and both ends are fixedly connected to the outside through flanges; the pipe jacket is provided with The two grooves are used as sealing seats, respectively the main sealing seat and the auxiliary sealing seat, and a sealing material is placed in each sealing seat; the main sealing seat is connected to the external air source through the first pipeline; the auxiliary sealing seat is passed through The second pipeline is connected with the backup air source; a spring is arranged in the first pipeline, and one end of the spring is connected with a trigger switch, and the trigger switch is connected with the solenoid valve provided on the second pipeline through the solenoid valve control line; when the main sealing seat Leakage in the seal causes the spring to elongate, so that the trigger switch triggers the solenoid valve to open, so that the secondary seal seat is injected with air through the backup air source for sealing.

Further, in the above-mentioned compensator, the sealing material is polytetrafluoroethylene.

Further, in the above-mentioned compensator, the ends of the inner pipe sleeve and the outer pipe sleeve are respectively provided with falling-off structures to prevent separation of inner and outer pipe sleeves.

Further, the above-mentioned compensator is provided with a shut-off valve on the first pipeline, and the shut-off valve is connected to an external air source through a quick pneumatic connector.

Further, in the above-mentioned compensator, the cross section of the main sealing seat and the auxiliary sealing seat is a trapezoidal structure.

Beneficial effect:

The pneumatic sleeve compensator provided by the present invention adopts a pneumatic structure for radial and axial displacement compensation. The radial installation displacement is relatively large, the installation is convenient, the maintenance is small, and the sealing of the pipeline can be guaranteed at the same time; in addition, The utility model has the advantages of simple structure and easy operation. The gas pressure is used to realize the sealing between the sealing material and the inner and outer casing of the pipeline. The sealing pressure can be adjusted, which expands the applicable pressure range of the device. In addition, the device adopts an inner concave structure to place the sealing material so that it does not shift or fall off.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the pneumatic sleeve compensator of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the present invention clearer, the following technical solutions in the present invention are clearly and completely described. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Figure 1 is a schematic cross-sectional structure diagram of the pneumatic sleeve compensator of the present invention. As shown in Figure 1, a pneumatic sleeve compensator provided by the present invention includes: a pipeline inner sleeve 13, a pipeline outer sleeve 2, and the pipeline inner sleeve 13 is installed in the pipe casing 2, and the two ends are fixedly connected to the outside through the flange 1; two grooves are arranged on the pipe casing 2 as sealing seats, respectively the main sealing seat 12 and the auxiliary sealing seat 14 , sealing material 10 is placed in each sealing seat; the main sealing seat 12 is connected with the external gas source 8 through the first pipeline; the auxiliary sealing seat 14 is connected with the backup gas source 3 through the second pipeline; in the first A spring 7 is arranged in the pipeline, and one end of the spring 7 is connected with a trigger switch 6, and the trigger switch 6 is connected with the solenoid valve 4 provided on the second pipeline through the solenoid valve control line 5; when the main seal seat 12 is sealed with leakage, the spring 7 is extended, so that the trigger switch 6 triggers the electromagnetic valve 4 to open, so that the auxiliary sealing seat 14 is injected with gas through the backup air source 3 for sealing.

The present invention adopts a two-stage pneumatic sealing structure, the first-stage seal is the main sealing device, and the second-stage seal is the auxiliary sealing device. When the application is required, the spring in the first pipeline is elongated due to the reduction of the main sealing pressure, and the elongation of the spring causes the trigger switch 6 and the solenoid valve control line to trigger the solenoid valve, so that the solenoid valve is opened and the backup air source is injected into the second pipe. The level sealing device plays the role of sealing. The invention adopts a two-stage sealing device structure to improve the safety of the device. The invention adopts a pneumatic sleeve structure, which is easy to install and operate, and especially improves the installation efficiency of the closed pipeline system. The invention utilizes the principle that the gas pressure is the same at each point in the closed system, so that the sealing material on the entire sealing ring is evenly stressed and the sealing pressure is the same, so as to achieve the sealing effect.

The device adopts a pneumatic structure for radial and axial displacement compensation. The radial installation displacement is relatively large, the installation is convenient, and the maintenance is small. As a new type of pipeline displacement compensation device, it can effectively solve the radial installation requirements of traditional expanders. The defect of small displacement and non-adjustable applicable pressure level. The inner and outer parts of the pipeline in the present invention can be freely expanded and contracted, and the variable size is large. The main seal seat and the auxiliary seal seat are both ring-shaped double-recessed structural seats. The seal seat is placed on the outer casing of the pipe for placing the sealing material polytetrafluoroethylene. Because it is concave, it can keep the sealing material from shifting , Do not fall off. During the maintenance of the traditional closed pipeline system, since the system is a closed system, all connections are rigid hard connections during maintenance, there is no effective installation space, gaskets, etc. cannot be installed effectively, the installation is difficult, and the flanges are sealed poor effect. With this device, the axial dimension of the device can be reduced through the change between the inner and outer jackets of the pipeline. After the equipment is installed, the device is connected to the flange of the pipeline. It is the same as the installation of an open system, and the installation is difficult. Small, good sealing effect between flanges. During the normal operation of the pipeline system, due to thermal expansion and other factors, the pipeline will expand with heat and contract with cold, which will cause changes in the length of the pipeline. change in pipe displacement.

Preferably, the sealing material 10 is polytetrafluoroethylene.

Specifically, the present invention uses polytetrafluoroethylene as the sealing material, which has good plastic deformation performance, and is squeezed by air pressure to make it plastic and deform to achieve the sealing effect, which greatly improves the service life of the device, the sealing effect and the sealing effect. Telescopic flexibility. The PTFE and the metal sleeve are in air pressure contact, and the PTFE has good free expansion and contraction performance, sliding performance and wear resistance.

Preferably, in order to improve the safety of the pneumatic sleeve compensator of the present invention, the ends of the inner pipe sleeve 13 and the outer pipe 2 are provided with shedding structures 11 to prevent separation of inner and outer pipe sleeves.

Preferably, for the convenience of installation and use, the present invention is provided with a shut-off valve 9 on the first pipeline, and the shut-off valve 9 is connected to the external air source 8 through a quick pneumatic connector.

Preferably, in order to improve the sealing performance of the present invention, the cross-sections of the main sealing seat 12 and the auxiliary sealing seat 14 are trapezoidal structures.

The present invention adopts an inner concave structure to place the sealing material so that it does not shift or fall off.

The invention adopts polytetrafluoroethylene as the sealing material, which improves the service life of the sealing material and makes the sliding between the outer casing of the pipeline (sealing material) and the inner casing of the pipeline easier.

The invention utilizes the gas pressure to realize the sealing between the sealing material and the inner sleeve of the pipe, and the sealing pressure can be adjusted, which expands the applicable pressure range of the device.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (5)

1. a kind of vapour-pressure type sleeve expansion joint is it is characterised in that include：Pipeline inner sleeve (13), duct wrap (2), described pipeline Inner sleeve (13) is arranged in duct wrap (2), and two ends are passed through flange (1) and are connected both with external stability；Outside described pipeline It is provided with 2 grooves as seal receptacle, respectively primary seal seat (12) and auxiliary seal receptacle (14), in each seal receptacle on set (2) In be placed with encapsulant (10)；Described primary seal seat (12) is connected with external gas source (8) by the first pipeline；Described auxiliary sealing Seat (14) is connected with bailout gas (3) by second pipe；It is provided with spring (7) in the first pipeline, one end of spring (7) is even Connect trigger switch (6), described trigger switch (6) passes through the electromagnetic valve (4) of control line of electromagnetic valve (5) and setting on second pipe Connect；Lead to spring (7) to extend when primary seal seat (12) is sealed with leakage, make trigger switch (6) trigger electromagnetic valve (4) and open, Thus being sealed to auxiliary seal receptacle (14) gas injection by bailout gas (3).

2. compensator according to claim 1 is it is characterised in that described encapsulant (10) is politef.

3. compensator according to claim 1 is it is characterised in that end part in pipeline inner sleeve (13), duct wrap (2) It is not provided with the anti-inside and outside detached dropping structure of pipe sleeve (11).

4. compensator according to claim 1 is it is characterised in that be provided with stop valve (9) on the first pipeline, described section Only valve (9) is connected with external gas source (8) by quick air pressure union joint.

5. compensator according to claim 1 is it is characterised in that the cutting of described primary seal seat (12) and auxiliary seal receptacle (14) Face is trapezium structure.