Pipeline pressure test tool

Abstract

The utility model belongs to the technical field of pipeline pressure testing, and particularly relates to a pipeline pressure testing tool. The pipeline pressure test tool comprises a tool body formed by an inner plug body and an outer hoop body, the inner plug body comprises two opposite side plates, and at least one core ring and a sealing ring are arranged between the side plates; the outer hoop body comprises two opposite pressing rings and a lantern ring arranged between the two pressing rings. A baffle is arranged on the outer side of the tool body and provided with a plurality of through holes used for containing bolts, the bolts comprise a plurality of extrusion bolts connected with the two pressing rings of the outer hoop body and push-pull bolts connected with the two side plates of the inner plug body, and threaded rods of the push-pull bolts are central shaft tubes and penetrate through the side plates of the inner plug body. A nut of the push-pull bolt is in matched contact with an outer side plate of the inner plug body; the pipeline pressure test tool is compact in structure and convenient to use, and has the characteristics of tight, long-acting and stable pipeline plugging, balanced pressure and no damage to the pipe wall.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pipeline pressure test technical field, specifically relates to a pipeline pressure test tool. BACKGROUND

[0002] Conveying pipelines are widely used in industrial and construction fields for transmitting fluids such as water, oil, gas, chemicals, etc. The pipelines are usually made of metal, plastic or composite materials, and their main function is to ensure the safe and efficient transmission of fluids from one place to another under certain pressure and flow. In order to ensure the safe and reliable operation of the pipeline, a series of detection work must be carried out after the pipeline installation is completed, and the most important one is pressure test detection.

[0003] Currently, the pressure test tool mainly uses a pressure test plug, which is set at one end of the pipeline to block it. The utility model with the patent number CN 222124944U discloses a bend pipeline pressure test tool. It includes a pipe blocking table, a sealing pad is connected to one side of the pipe blocking table, a clamping structure is arranged on one side of the sealing pad, a connecting structure is arranged on one side of the clamping structure, and a lifting lug is fixed on one side of the connecting structure. Through the design of the reliable clamping structure, the tool can firmly fix the bend pipeline and prevent the pipeline from moving or falling off during the pressure test.

[0004] During use of the pressure test tool, the pipe blocking table and the clamping structure are not easy to control the force applied to the pipe wall, which can easily cause the inner diameter of the pipe wall to be expanded. Especially for stainless steel pipes formed by welding, the material is usually 304, which has a large extension type and a large pipe opening deformation. When pressure testing, the force of the pressure test plug expanding outward is too large, which causes the pipe opening to expand, and the pressure test plug is dangerous and even causes a safety accident. Secondly, when used on a large diameter, the contact surface of the above-mentioned pressure test plug is small, the surrounding tension bolts are too many and the force is not balanced, which cannot ensure that the pressure test plug is consistent with the pipe axis direction when it is tightened, so it is easy to tilt and cause the blockage to be not tight. Thirdly, the pressure test tool has a complex structure, many matching components, and is troublesome to install and disassemble, and is not convenient to operate, so the use effect is not ideal. Utility model content

[0005] The utility model aims at providing a pipeline pressure test tool which is compact in structure and convenient to use, has the characteristics of tight and long-acting sealing of the pipeline, balanced pressure and no damage to the pipe wall.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0007] A pipeline pressure testing fixture, characterized in that: it comprises a fixture body consisting of an inner plug and an outer clamp; the inner plug includes two opposing side plates, with at least one core ring and / or sealing ring disposed between the side plates; the outer clamp includes two opposing pressure rings and a collar placed between them; a baffle is provided on the outer side of the fixture body, the baffle having several through holes for placing bolts; the bolts include several compression bolts connecting the two pressure rings of the outer clamp and push-pull bolts connecting the two side plates of the inner plug, the thread of the push-pull bolt being a central shaft tube that penetrates the side plate of the inner plug, and the nut of the push-pull bolt engaging with the outer side plate of the inner plug.

[0008] The additional technical features constituting the above-mentioned pipeline pressure testing fixture also include:

[0009] —The outer collar is composed of several strips arranged along the circumference of the pipe, and the two sides of the strips are in contact with the pressure ring through a bevel fit;

[0010] —The inner plug has two core rings that are in contact with each other through an inclined surface. One core ring is connected to the side plate, and the other core ring is composed of several strips arranged along the circumference of the pipe. The strips achieve radial position changes through the inclined surface.

[0011] —The bolts also include a plurality of set bolts arranged in a circumferential direction, the set bolts connecting the two side plates of the inner plug body and located inside the core ring;

[0012] —A preload spring is fitted onto the extrusion bolt, and the preload spring is located between the two pressure rings; a pre-tightening spring is provided between the extrusion bolt and the collar.

[0013] Compared with the prior art, the pipeline pressure testing fixture provided by this utility model has the following advantages: The fixture consists of an inner plug and an outer clamp. After installation at the pipe opening, the inner plug seals the opening, while the outer clamp ensures the overall structural stability and balances the force applied to the pipe wall, preventing damage and deformation. Secondly, the two side plates of the inner plug are connected at their centers by push-pull bolts. The bolt's thread is a central shaft, and the nut of the push-pull bolt engages with the outer side plate of the inner plug. The push-pull bolts ensure that the two side plates are aligned along the pipe axis. The relative movement of the center rings causes the core ring or sealing ring to adhere to the pipe wall, ensuring that the inner plug is always centered and the sealing structure is stable for a long time. The two pressure rings of the outer clamp are connected by several extrusion bolts. The extrusion bolts distributed circumferentially can effectively tighten the collar to the outside of the pipe, with balanced pressure and maintaining the shape of the pipe. Furthermore, a baffle is set on the outside of the tooling body, and the baffle has several through holes for placing the aforementioned bolts. This improves the overall integrity of the tooling, facilitates on-site installation and disassembly, and makes operation more convenient. It has the advantages of compact structure, safety and durability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a pipeline pressure testing fixture according to the present invention;

[0015] Figure 2 This is a schematic diagram of another structure of the device. Detailed Implementation

[0016] The structure and working principle of the novel pipeline pressure testing fixture provided by this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] In the description of this utility model, unless otherwise stated, the terms "inner / outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "set / equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] like Figure 1 As shown, the structure of this novel pipeline pressure testing fixture includes a fixture body consisting of an inner plug 1 and an outer clamp 2. The inner plug 1 includes two opposing side plates (11, 12), with at least one core ring 13 and / or sealing ring 14 disposed between the side plates (11, 12). The outer clamp 2 includes two opposing pressure rings 21 and a collar 22 placed between them. A baffle 3 is provided on the outside of the fixture body, and the baffle 3 has several through holes for placing bolts. The bolts include several compression bolts 31 connecting the two pressure rings 12 of the outer clamp 2 and push-pull bolts 32 connecting the two side plates (11, 12) of the inner plug 1. The screw of the push-pull bolt 32 is a central shaft tube 41, which penetrates the side plates (11, 12) of the inner plug 1. The nut 42 of the push-pull bolt 32 is in contact with the outer side plate 12 of the inner plug 1.

[0020] Its working principle is as follows: The tool consists of an inner plug 1 and an outer clamp 2. The inner plug 1 is placed inside the pipe opening, and the outer clamp 2 is fitted outside the pipe opening. The baffle 3 is placed at the end of the pipe opening. The push-pull bolt 32 on the baffle 3 passes through the center of the two side plates (11, 12) of the inner plug 1 (i.e., the axis of pipe a) and is tightened by the external nut 42, so that the side plates (11, 12) always move relative to each other along the axis of pipe a, squeezing the middle core ring 13 or sealing ring 14 to achieve a tight seal with the inner wall of pipe a. The extrusion bolt 31 on the edge of the baffle 3 connects to the two pressure rings 12 of the outer clamp 2. After the bolt is tightened, the pressure rings 12 move relative to each other to squeeze the middle collar 22, applying pressure to the outer wall of pipe a. The internal and external pressures are balanced to ensure that pipe a does not deform during the pressure test. The pressure test plug is stable in pipe a for a long time and does not shift or tilt.

[0021] In the structure constituting the aforementioned novel pipeline pressure testing fixture a

[0022] --like Figure 2 As shown, the collar 22 of the outer hoop 2 is composed of several strips 23 arranged along the circumference of the pipe a. The two sides of the strips 23 are in contact with the pressure ring 12 through the slope 24. The spacing between the pressure rings 12 is adjusted by tightening the nuts of the compression bolts 31, so that the pressure rings 12 and the strips 23 can slide through the slope 24, realizing the radial displacement change of the strips 23. That is, the size of the assembled collar 22 is adapted to different outer diameters of the pipe a.

[0023] —Furthermore, the inner plug 1 has two core rings 13, which are in contact with each other through inclined surfaces 15. One core ring 13 is connected to the side plate 11, and the other core ring 13 is composed of several strips 16 arranged along the circumference of the pipe a. The strips 16 achieve radial position change through the inclined surfaces 15. That is, the push-pull bolt 32 changes the distance between the two opposite side plates (11, 12) by tightening the nut 42, thereby causing the strips 16 constituting the core ring 13 to slide along the contact inclined surfaces and undergo radial position change. That is, the circumferential radius of the assembled strips 16 adapts to the inner diameter of different pipes a.

[0024] The sealing ring 14 can be installed on the side of the core ring 13 or on the side of the strip 16. It can be fixed by surface groove. It is best to fit a bushing inside the sealing ring 14 to ensure that the sealing ring 14 is radially close to the inner wall of the pipe when the core ring 13 and the strip 16 slide relative to each other.

[0025] — Preferably, the bolts further include a plurality of set bolts 33 arranged in a ring. The set bolts 33 connect the two side plates (11, 12) of the inner plug body 1 and are located inside the core ring 13. They are used to push the core ring outward along the radial direction of the pipe a. The set bolts 33 are evenly arranged around the axial direction. After the two side plates (11, 12) are connected and tightened, the structure of the inner plug body 1 is more three-dimensional and stable, not easy to tilt or shift, and can better ensure that the side plates (11, 12) are always consistent with the axial direction of the pipe a when they move relative to each other.

[0026] After positioning inside pipe a, sealing is achieved by relative movement of side plates (11, 12). The set bolt 33 can also be replaced by the telescopic rod of the cylinder to improve installation efficiency.

[0027] — Preferably, a preload spring 51 is fitted on the extrusion bolt 31. The preload spring 51 is located between the two pressure rings 12. Dynamic preload is achieved through the preload spring 51 between the pressure rings 12. A preload spring 52 is set between the extrusion bolt 31 and the collar 22 to maintain the elastic buffering effect of the collar 22 on the outer wall of the pipe a, thereby reducing the impact damage to the pipe wall during the pressure test.

[0028] The above-described embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the implementation of this utility model. Therefore, any other modifications or equivalent substitutions to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A pipeline pressure testing fixture, characterized in that: The tooling body comprises an inner plug and an outer clamp. The inner plug includes two opposing side plates with at least one core ring and / or sealing ring between them. The outer clamp includes two opposing pressure rings and a collar placed between them. A baffle is provided on the outer side of the tooling body, and the baffle has several through holes for placing bolts. The bolts include several compression bolts connecting the two pressure rings of the outer clamp and push-pull bolts connecting the two side plates of the inner plug. The thread of the push-pull bolt is a central shaft tube that passes through the side plate of the inner plug, and the nut of the push-pull bolt engages with the outer side plate of the inner plug.

2. The pipeline pressure testing fixture according to claim 1, characterized in that: The outer collar is composed of several strips arranged along the circumference of the pipe, and the two sides of the strips are in contact with the pressure ring through a bevel fit.

3. The pipeline pressure testing fixture according to claim 1, characterized in that: The inner plug has two core rings that are in contact with each other via an inclined surface. One core ring is connected to the side plate, and the other core ring is composed of several strips arranged along the circumference of the pipe. The strips achieve radial position changes through the inclined surface.

4. A pipeline pressure testing fixture according to claim 1 or 3, characterized in that: The bolt also includes a plurality of set bolts arranged in a circumferential direction, the set bolts connecting the two side plates of the inner plug body and located inside the core ring.

5. The pipeline pressure testing fixture according to claim 1, characterized in that: A preload spring is fitted onto the extrusion bolt, and the preload spring is located between the two pressure rings; a pre-tightening spring is provided between the extrusion bolt and the collar.

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