CN205120507U - Expansion joint's hydrostatic pressing testing arrangement - Google Patents

Abstract

The utility model provides a hydrostatic pressure test device for an expansion joint, which comprises a sealing sleeve, which is set on the expansion joint, and has a fluid inlet and outlet hole on the sealing sleeve; The hoop is fixedly connected with the sealing sleeve. In the utility model, the hoop is fixedly connected with the sealing sleeve to prevent the sealing sleeve from moving due to the impact of water pressure on the sealing sleeve during water injection. This device does not need to use a connecting screw equal to the length of the pipeline to seal and fix the two ends. The length of the pipeline to be tested is limited, so this hydrostatic testing device is suitable for both pipelines with expansion joints at only one end, and pipelines with expansion joints at both ends.

Description

A hydrostatic pressure testing device for an expansion joint

technical field

The utility model relates to the field of pipeline manufacturing, in particular to a hydrostatic pressure testing device for expansion joints.

Background technique

A pipeline is a device used to transport gas, liquid or fluid with solid particles connected by pipes, pipe connectors and valves. Usually, after the fluid is pressurized by blowers, compressors, pumps and boilers, it flows from the high-pressure part of the pipeline to the low-pressure part, and it can also be transported by the pressure or gravity of the fluid itself. Pipes are widely used, mainly in water supply, drainage, heat supply, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial devices.

Expansion joints, also called pipeline compensation joints, are new products that connect pumps, valves, pipelines and other equipment with pipelines. The equipment, pipelines and expansion joints are connected by bolts to make them a whole. The expansion joints have a certain displacement. In this way, it can be adjusted according to the on-site installation size during installation and maintenance, and the axial thrust can be transmitted back to the entire pipeline system during work. This not only improves work efficiency, but also plays a certain role in protecting pumps, valves and other equipment.

In addition, due to the large amount of pipe expansion, high temperature, and large pressure area, foundation concrete pouring or pre-embedded pipes in building water supply and drainage projects, in these projects, pipes are subject to building foundation settlement, equipment resonance, geological changes and pipelines. During the process of medium change, the position where the pipeline is distributed begins to be stressed, deformed, and twisted to destroy the pipeline. Therefore, the rupture of the pipeline that has been embedded for a long time has brought great inconvenience to the construction unit. In order to overcome these difficulties and ensure the safe operation of the pipeline, an expansion joint or expansion joint is used, which can expand and contract axially within a certain range to overcome Pipelines are shifted, out-of-concentric, stretched and expanded at various angles. The pipe can expand and contract freely in the expander or expansion joint. Once the maximum amount of expansion and contraction is exceeded, the expansion joint itself acts as a limiter to ensure the safe operation of the pipeline.

The manufacture of expansion joints requires the use of mold forming and welding forming. After the manufacturing is completed, in order to check the quality of expansion joints and pipes, especially the quality of welding and forming, liquid is often injected into the pipe, and the pressure generated by the liquid is used to impact the weld. , which is the hydrostatic pressure test.

In the prior art, the equipment for hydrostatic pressure testing of expansion joints is limited to pipes with expansion joints at one end, and the other end of the pipe must be a flange. Please refer to Figure 1, which consists of two expansion joints at one end and 04 at the other end. 03 pipeline connection, wrap the expansion joints 04 of the two pipelines in a steel sleeve 01, place the device horizontally, and set the water injection hole 06 at the lower end of the flange 03 of one pipeline, and the flange 03 of the other pipeline The upper end of the flange 03 is provided with a vent hole 07. When the water is not full, the vent hole 07 is located above the water level. Several connecting screws 02 are used to connect and fix the flanges 03 of the two pipes to prevent the flanges from leaking. 03 move. Water is injected into the device from the water injection hole 06, and the air discharged by the water in the device flows out from the air outlet 07. After the water is full, the air outlet 07 is closed, and the hydrostatic pressure test instrument is connected from the water injection hole 06. There is an adjustment gap 09 between the two expansion joints 04. A nylon rod 05 and a rubber ring 08 are provided between the side wall of the steel sleeve 01 and the two expansion joints 04. The nylon rod 05 is used to make the expansion joint 04 The side wall is closely connected with the side wall of the steel sleeve 01, and the rubber ring 08 is to prevent the water in the pipe from being discharged from the adjustment gap 09. But the hydrostatic pressure test equipment of the expansion joint 04 has the following disadvantages:

1. Generally, the connecting screw 02 cannot be set too long, otherwise the fixing force of the flange 03 at both ends is too small, and the flange 03 will move due to the pressure of the water during the test, causing water to flow out, while the connecting screw 02 It cannot be set too long, which means that the length of the test pipeline is limited;

2. The type of test is limited. If a pipe is connected to expansion joint 04 at both ends, it is not suitable for the above test equipment.

In view of the above problems, it is necessary to invent a hydrostatic pressure testing device for expansion joints, which does not need to limit the length of the tested pipeline, and can be applied to pipelines with expansion joints at both ends and expansion joints at one end and flanges at the other end. pipeline.

Utility model content

The utility model provides a hydrostatic pressure testing device for an expansion joint, which is composed of a sealing sleeve set on the expansion joint and a hoop arranged at one end of the expansion joint and a pipeline. The hoop is fixedly connected with the sealing sleeve to prevent water injection When the water pressure impacts the sealing sleeve, the sealing sleeve moves. This device does not need to use a connecting screw equal to the length of the pipe to seal and fix the two ends, and it is not necessary to limit the length of the pipe to be tested. Therefore, this hydrostatic test The device is suitable for both pipes with expansion joints at one end and pipes with expansion joints at both ends.

In order to achieve the above purpose, the utility model provides a hydrostatic pressure testing device for expansion joints, including

A sealing sleeve, which is set on the expansion joint, and has a fluid inlet and outlet hole on the sealing sleeve;

A hoop is fixedly connected to one end of the expansion joint connected to the pipeline, and the hoop is fixedly connected to the sealing sleeve.

Preferably, the sealing sleeve is an end cover with a seal at one end and an opening at the other end, and the expansion joint enters the sealing sleeve from the opening and is sealed by the sealing sleeve.

Preferably, a fluid leakage prevention device is provided between the sealing sleeve and the expansion joint.

Preferably, the fluid leakage prevention device is a rubber ring, and the rubber ring is located between the inner side wall of the sealing sleeve and the outer side wall of the expansion joint.

Preferably, the hoop is wrapped on the outer ring of the expansion joint close to the pipeline, and the hoop is bolted to the outer ring of the expansion joint.

Preferably, the sealing sleeve is connected to the circumference of the hoop through several connecting screws, and the connections of the connecting screws on the circumference of the hoop are symmetrical with respect to the axis of the pipeline.

Preferably, a connecting shaft is provided on the outer wall of the sealing sleeve, and the connecting shaft has a screw hole for screwing in the connecting screw, and the distribution of the connecting shafts is symmetrical with respect to the axis of the pipeline.

Preferably, the fluid inlet and outlet holes are water injection holes and/or exhaust holes.

Preferably, both the hoop and the sealing sleeve are made of steel.

Preferably, both ends of the pipeline are connected with the expansion joints, the expansion joints at both ends are covered with the sealing sleeve, the sealing sleeve at one end has a water injection hole, and the sealing sleeve at the other end There is a vent hole on the top, and the height of the vent hole is greater than or equal to the height of the liquid level during the hydrostatic pressure test.

Compared with the prior art, the beneficial effect of the utility model is: the utility model provides a hydrostatic pressure test device for expansion joints, including

A sealing sleeve, which is set on the expansion joint, and has a fluid inlet and outlet hole on the sealing sleeve;

A hoop is fixedly connected to one end of the expansion joint connected to the pipeline, and the hoop is fixedly connected to the sealing sleeve.

The utility model is composed of a sealing sleeve set on the expansion joint and a hoop fixed at one end connecting the expansion joint and the pipeline. The hoop and the sealing sleeve are fixedly connected to prevent water pressure from causing damage to the sealing sleeve when water is injected into the pipeline. The impact makes the sealing sleeve open. Since this device fixes the sealing sleeve at the same end, there is no need to use a connecting screw equal to the length of the pipe to seal and fix the two ends, and it is not necessary to use the same connecting screw as the pipe. The length of the pipeline to be tested, and this hydrostatic pressure testing device is suitable for pipelines with expansion joints at only one end. If testing a pipeline with expansion joints at both ends, it is only necessary to set the expansion joints at both ends into the sealing sleeve, and Fix the hoop at the end where the expansion joint is connected to the pipeline, so that the hoop is fixedly connected with the sealing sleeve at one end, inject water into the fluid inlet and outlet holes of one section, and discharge air from the fluid inlet and outlet holes of the other section, and then the hydrostatic pressure test can be carried out , so this hydrostatic pressure test device is suitable for both pipes with expansion joints at one end and pipes with expansion joints at both ends.

Description of drawings

Fig. 1 is the working schematic diagram of expansion joint hydrostatic pressure test equipment in the prior art;

Fig. 2 is a working diagram of the expansion joint hydrostatic pressure testing device provided by the utility model.

Diagrams in the prior art: 01-steel sleeve, 02-connecting screw, 03-flange, 04-expansion joint, 05-nylon rod, 06-water injection hole, 07-venting hole, 08-rubber ring, 09-Adjust the gap;

The utility model diagram: 1-sealing sleeve, 2-connecting screw, 3-clamp, 4-expandable joint, 5-rubber ring, 6-water injection hole, 7-venting hole, 8-pipeline, 9-connecting shaft .

detailed description

In order to make the above purpose, features and advantages of the present utility model more obvious and understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings.

The utility model provides a hydrostatic pressure test device for expansion joints, please refer to Fig. 2. In this embodiment, the hydrostatic pressure test is performed on the pipelines connected with expansion joints 4 at both ends. The hydrostatic pressure test device includes sealing The sleeve 1 and the hoop 3 fixedly connected with the sealing sleeve 1, wherein,

The sealing sleeve 1 is set on the expansion joint 4 connected to each end of the pipeline 8. The sealing sleeve 1 is an end cap with a seal at one end and an opening at the other end. The opening is cylindrical in shape, and the diameter of the opening is slightly larger than that of the pipeline. 4 enters the sealing sleeve 1 from the opening and is sealed by the sealing end of the sealing sleeve 1. The sealing sleeve 1 has a fluid inlet and outlet hole, and the fluid inlet and outlet holes are the water injection hole 6 and the exhaust hole 7.

Place the pipeline 8 horizontally, set the water injection hole 6 at the left end, close to the inner wall of the expansion joint 4, and close to the lowest height on the inner wall of the expansion joint 4, the radial distance between the water injection hole 6 and the axis is smaller than the inner radius of the pipeline 8, Ensure that the water in the water injection hole 6 directly enters the pipeline 8;

The vent hole 7 is arranged at the right end, also close to the inner wall of the expansion joint 4, and close to the highest point on the inner wall of the expansion joint 4. When the pipeline 8 is subjected to a hydrostatic pressure test, water is initially injected into the pipeline 8 and exhausted. The position of the hole 7 remains higher than the liquid level, and the air squeezed by the water in the pipeline 8 flows from the vent hole 7 to the outside until the water fills the pipeline 8, at which time the air has all been discharged, and the liquid level is equal to The height of vent hole 7, now vent hole 7 is closed. Similarly, since the exhaust hole 7 needs to communicate directly with the inside of the pipeline 8 , the radial distance from the exhaust hole 7 to the axis of the pipeline 8 is also smaller than the inner radius of the pipeline 8 .

Preferably, in order to prevent water from flowing out between the inner side wall of the sealing sleeve 1 and the outer side wall of the expansion joint 4 when injecting water into the pipeline 8, a The rubber ring 5, the rubber ring 5 enhances the sealing between the sealing sleeve 1 and the expansion joint 4, and prevents water from flowing out from between the inner side wall of the sealing sleeve 1 and the outer side wall of the expansion joint 4.

Preferably, two rubber rings 5 are provided to enhance the sealing between the sealing sleeve 1 and the expansion joint 4 .

The hoop 3 is fixedly connected to the end where the expansion joint 4 is connected to the pipeline 8. Generally, the outer surface of the expansion joint 4 has several raised outer rings with the same outer diameter, and the hoop 3 is wrapped around the expansion joint 4 and the pipeline. On the adjacent outer ring of the joint, and on the circumference, bolts are used to pass through the hoop 3 and the outer ring so that the hoop 3 is fixed on the outer ring. The reason why the hoop 3 is fixed on the outer ring adjacent to the connection between the expansion joint 4 and the pipeline is that the distance between the hoop 3 and the sealing sleeve 1 can be increased. When water impacts the sealing sleeve 1, the hoop 3 will give The pulling force of the sealing sleeve 1 is opposite to the impact direction of the water, and the reaction force of the pulling force acts on the outer ring, and the outer ring makes the expansion joint 4 retract toward the sealing sleeve 1, but if the sealing sleeve 1 and the hoop 3 If the distance is larger, the retraction of the expansion joint 4 toward the sealing sleeve 1 requires a greater force, and correspondingly, the pulling force given to the sealing sleeve 1 will be greater, so that the sealing performance of the sealing sleeve 1 to the expansion joint 4 is enhanced.

On the circumference of the hoop 3, with the axis of the pipe 8 as the axis of symmetry, four screw holes are symmetrically distributed, and at the same time, on the outer wall of the sealing sleeve 1, four outward protrusions are set at positions corresponding to the above four screw holes The connecting shaft 9 of each connecting shaft 9 is provided with screw holes corresponding to the screw holes on the circumference of the hoop 3 respectively, and the hoop 3 is fixedly connected with the connecting shaft 9 by using the connecting screw 2, that is, one end of the connecting screw 2 is screwed into The screw hole on the circumference of the hoop 3, and the other end is screwed into the screw hole on the connecting shaft 9, so that the sealing sleeve 1 is fixed by the hoop 3 at the same end of the pipeline 8, so as to prevent the water from affecting the sealing when injecting water into the pipeline 8. The sleeve 1 causes an impact, so that the sealing sleeve 1 is separated from the expansion joint 4 or shifted, so that water leaks from the pipe 8 to the outside.

Preferably, the materials of the hoop 3 and the sealing sleeve 1 are both steel.

The utility model is composed of a sealing sleeve 1 set on the expansion joint 4 and a hoop 3 fixed at one end connecting the expansion joint 4 and the pipeline 8. The hoop 3 is fixed on the outer ring of the expansion joint 4. The hoop 3 is connected with the pipe 8. The sealing sleeve 1 is fixedly connected by four connecting screws 2 to prevent the sealing sleeve 1 from being opened due to the impact of water pressure on the sealing sleeve 1 when water is injected into the pipeline 8, because this device fixes the sealing sleeve 1 at the same end Complete, there is no need to use the connecting screw 2 equal to the length of the pipeline 8 to seal and fix the two ends, so it is not necessary to limit the length of the pipeline 8 to be tested. This hydrostatic pressure testing device is suitable for pipelines 8 with expansion joints 4 at only one end, It is also applicable to pipes 8 connected to expansion joints 4 at both ends.

Apparently, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. If these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (10)

1. A hydrostatic pressure test device for an expansion joint, characterized in that it comprises A sealing sleeve, which is set on the expansion joint, and has a fluid inlet and outlet hole on the sealing sleeve; A hoop is fixedly connected to one end of the expansion joint connected to the pipeline, and the hoop is fixedly connected to the sealing sleeve. 2. The hydrostatic pressure testing device of the expansion joint according to claim 1, wherein the sealing sleeve is an end cap with a seal at one end and an opening at the other end, and the expansion joint enters the seal from the opening. sleeve and is sealed by the sealing sleeve. 3 . The hydrostatic pressure testing device for expansion joints according to claim 1 , wherein a fluid leakage prevention device is provided between the sealing sleeve and the expansion joint. 4 . 4. The hydrostatic pressure testing device of the expansion joint according to claim 3, wherein the fluid leakage prevention device is a rubber ring, and the rubber ring is located on the inner side wall of the sealing sleeve and the outer side of the expansion joint between walls. 5. The hydrostatic pressure testing device of the expansion joint according to claim 1, wherein the hoop is wrapped on the outer ring of the expansion joint close to the pipeline, and the hoop is connected to the The outer ring bolt connection of the expansion joint. 6. The hydrostatic pressure testing device for expansion joints according to claim 1, wherein the sealing sleeve is connected to the circumference of the hoop through several connecting screws, and the connecting screws are connected to the circumference of the hoop. The connection on is symmetrical about the axis of the pipe. 7. The hydrostatic pressure testing device of the expansion joint according to claim 6, wherein a connecting shaft is arranged on the outer wall of the sealing sleeve, and the connecting shaft has a screw hole for screwing in the connecting screw rod , the distribution of the connecting axes is symmetrical with respect to the axis of the pipeline. 8. The hydrostatic pressure testing device for expansion joints according to claim 1, wherein the fluid inlet and outlet holes are water injection holes and/or exhaust holes. 9 . The hydrostatic pressure testing device for expansion joints according to claim 1 , wherein the materials of the hoop and the sealing sleeve are both steel. 10 . 10. The hydrostatic pressure testing device for expansion joints according to claim 1, wherein both ends of the pipeline are connected with the expansion joints, and the expansion joints at both ends are covered with the sealing sleeves , the sealing sleeve at one end has a water injection hole, and the sealing sleeve at the other end has a vent hole, and the height of the vent hole is greater than or equal to the height of the liquid level during the hydrostatic pressure test.