CN205138781U - Compression test pipe end is connected and sealing device - Google Patents

Abstract

A pressure test pipe end connection and sealing device. The utility model comprises a blind plate and a hydraulic machine hanging plate, one end of the blind plate is fixedly connected with the hydraulic machine hanging plate, a sealing device is installed on the contact end surface between the blind plate and the hydraulic machine hanging plate, and the other end of the blind plate is fixedly connected with the cover plate; A sealing ring is installed between the outer circle of the plate seam and the radial direction of the inner hole of the blind plate; an axial seal is installed between the end face of the inner hole of the blind plate and the end face of the cover plate, and there is a radial seal on the blind plate corresponding to the radial direction of the axial seal. Pressure input hole. The beneficial effect is that the structure is simple and reasonable, the axial seal is realized by pressing the axial seal, no machining is required on the pipe end, no specific performance requirements are imposed on the pressure testing machine, the production cost is reduced, and secondary machining after the pressure test is avoided quality defects.

Description

Pressure test pipe end connection and sealing device

technical field

The utility model relates to a pressure vessel test device, in particular to a pressure test pipe end connection and sealing device.

Background technique

Welded valves are widely used in various fields. Its superior quality and high performance stability cannot be achieved by ordinary cast steel ball valves. The service life of fully welded valves is much longer than that of cast steel ball valves. Fully welded valves are widely used in urban gas , urban heating, petrochemical, shipbuilding, steel, pressure regulating stations, power plants and other pipeline equipment.

At present, when the valve is tested for pressure before leaving the factory, the connection between the valve and the pressure testing machine adopts two types of inner radial seal and groove axial seal. During the pressure test of the valve with a sleeve, since the sleeve is a straight seam welded pipe, the ellipticity deviation is large, and the sealing surface of the pressure test needs to be machined at the end of the pipe before the pressure seal test can be performed.

The inner radial seal is to rely on the inner side of the valve port to be connected with the blind plate of the pressure testing machine, and the O-ring is radially sealed (as shown in Figure 1). Finally, the sealing part is cut off and the groove is processed and welded with the pipe. The inner radial seal has very strict requirements on the machining size of the connection, and the sleeve valve needs to be processed after a pressure test. During the reprocessing process, iron filings are easy to fall into the valve, affecting the quality of the valve, and even causing the valve to be scrapped. Processing costs High, high quality risk.

The axial sealing of the groove is to rely on the welding groove of the valve port to connect with the blind plate of the pressure testing machine, and the axial extrusion O-ring seal (as shown in Figure 2). The axial seal of the groove has strict requirements on the machining size of the joint, and the pressure testing machine is required to have the ability to axially overcome the test pressure to squeeze the O-ring to ensure the seal during the whole pressure test. Groove axial seal has high requirements on pressure testing machine, high equipment cost and processing cost.

Utility model content

In order to overcome the shortcomings of high equipment cost, high processing cost and high quality risk in the pressure test of the existing pressure vessel, the utility model provides a pressure test pipe end connection and sealing device.

The technical scheme adopted by the utility model to solve its technical problems is: the pressure test pipe end connection and sealing device include a blind plate, a hydraulic machine hanging plate, one end of the blind plate is fixedly connected with the hydraulic machine hanging plate, and the blind plate and the hydraulic machine hanging plate are connected. A sealing device is installed on the contact end surface; the other end of the blind plate is fixedly connected to the cover plate; a sealing ring is installed between the outer circle of the cover plate and the radial direction of the inner hole of the blind plate; the end surface of the inner hole of the blind plate is connected to the cover An axial seal is installed between the end faces of the plates; a radial pressure input hole is provided on the blind plate radially corresponding to the axial seal.

The outer circular surface of the axial seal is tooth-shaped, and a metal support ring is installed at one end of the inner hole, and the metal support ring is connected with the rubber body of the axial seal through axially installed pins. The tooth profile of the outer circular surface of the axial seal is a complete tooth in the middle and half teeth at both ends, and the diameter of the complete tooth is greater than the diameter of the half tooth.

The beneficial effect of the utility model is that the structure is simple and reasonable, and the axial seal is realized by pressing the axial seal, without machining the pipe end, and there is no specific performance requirement for the pressure testing machine, which reduces the production cost and avoids the pressure after the pressure test. Quality defects caused by secondary machining.

Description of drawings

Fig. 1 is a connection schematic diagram of an existing pressure testing machine using an inner radial seal.

Fig. 2 is a connection schematic diagram of an existing pressure testing machine using a groove axial seal.

Fig. 3 is a structural schematic diagram of the pressure test pipe end connection and sealing device of the utility model.

Fig. 4 is a sectional view of the axial seal of the present invention.

In the figure: 1. Blind plate, 2. Axial seal, 3. Cover plate, 4. Seal ring, 5. Bolt, 6. Hanging plate of hydraulic machine, 7. Radial pressure input hole, 8. Metal support ring, 9 .Pin, 10. Tooth shape.

detailed description

Below in conjunction with Fig. 3, Fig. 4 and embodiment the utility model is further described. However, those skilled in the art should know that the present invention is not limited to the specific embodiments listed, as long as it conforms to the spirit of the present invention, it should be included in the protection scope of the present invention.

See Figure 3. The pressure test pipe end connection and sealing device of the utility model includes a blind plate 1 and a hydraulic machine hanging plate 6, one end of the blind plate 1 and the hydraulic machine hanging plate 6 are fixedly connected by bolts, and the contact end surface between the blind plate 1 and the hydraulic machine hanging plate 6 A sealing device is installed; the other end of the blind plate 1 and the cover plate 3 are fixedly connected by bolts 5 .

The inner hole of the blind plate 1 is a stepped hole with a large outside and a small inside. The outer circle of the cover plate 3 is stepped. A sealing ring 4 is installed between the outer circle of the small end of the cover plate 3 and the radial direction of the inner hole of the blind plate 1. , usually the sealing ring 4 is an O-shaped sealing ring; an axial seal 2 is installed between the end face of the stepped inner hole of the blind plate 1 and the end face of the cover plate 3, and the outer circular surface of the axial seal 2 (see Figure 4) is a tooth Shape 10, the middle of the tooth shape 10 is a complete tooth, and the two ends are half teeth, and the diameter of the complete tooth is greater than the diameter of the half tooth. The inner hole of the rubber body of the axial seal 2 is a stepped hole, and a metal support ring 8 is installed in the big end hole, and the metal support ring 8 is connected with the rubber body of the axial seal 2 through an axially installed pin 9 . There is a radial pressure input hole 7 on the blind plate 1 corresponding to the radial direction of the axial seal 2, through the radial pressure input hole 7 pressurization acts on the outer circle of the axial seal 2, and the deformation of the axial seal 2 is squeezed , to achieve the sealing function.

The pressure test pipe end connection and sealing device of the utility model is used in pairs, and the two ends of the valve sleeve to be tested are respectively inserted into the pipe end connection and sealing device. During the pressure test:

First, inject water and pressurize through the radial pressure input hole 7 of the blind plate 1, so that the axial seal 2 with a large gap shrinks and deforms after being compressed, until the outer wall of the pipe end is tightly hugged to achieve a sealing effect, and the radial pressure input hole 7 is closed ;

Then, inject liquid or gas into the inside of the valve through the pressure inlet inside the blind plate 1 to carry out the pressure test.

Pressure relief after pressure test:

First, open the pressure inlet to release the pressure in the valve;

Then, open the radial pressure input hole 7 on the blind plate 1 in the pipe end connection and sealing device, release the pressure applied to the axial seal 2, restore the axial seal 2 to its original state, and release the seal on the pipe end. Remove the pressure test valve.

The technical scheme involved in the utility model is not only applicable to the connection and sealing of the pressure test pipe end of the welded valve with sleeve and the pressure test machine, but also suitable for the connection and sealing of the pressure test pipe end of large pipelines and steel pipes.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the patent claims.

Claims (3)

1. A pressure test pipe end connection and sealing device, including a blind plate and a hydraulic machine hanging plate, one end of the blind plate is fixedly connected with the hydraulic machine hanging plate, and a sealing device is installed on the contact end surface between the blind plate and the hydraulic machine hanging plate, its characteristics Yes: the other end of the blind plate (1) is fixedly connected to the cover plate (3); a sealing ring (4) is installed between the outer circle of the cover plate (3) and the radial direction of the inner hole of the blind plate (1) ; An axial seal (2) is installed between the end face of the inner hole of the blind plate (1) and the end face of the cover plate (3), and the axial seal (2) is radially corresponding to the blind plate (1) There are radial pressure input holes (7). 2. The pressure test pipe end connection and sealing device according to claim 1, characterized in that: the outer circular surface of the axial seal (2) is toothed (10), and one end of the inner hole is installed with a metal support ring ( 8), the metal support ring (8) is connected with the rubber body of the axial seal (2) through the axially installed pin (9). 3. The pressure test pipe end connection and sealing device according to claim 2, characterized in that: the tooth shape (10) on the outer circular surface of the axial seal (2) is a complete tooth in the middle, and half teeth at both ends, The diameter of a full tooth is larger than that of a half tooth.