CN118500653B - An air tightness detection device for water conservancy project pipeline - Google Patents

Abstract

The present invention relates to the field of air tightness detection technology, and in particular to an air tightness detection device for water conservancy project pipelines. It aims to solve the problem that it is time-consuming, labor-intensive and ineffective for staff to use existing devices to perform air tightness detection. It includes a symmetrically distributed first fixed shell, the first fixed shell is connected to a second fixed shell by bolts, the first fixed shell and the adjacent second fixed shell together form a water storage shell, the first fixed shell and the second fixed shell are both fixed with uniformly distributed first elastic air bags, a rubber sleeve for sealing detection is welded on the pipeline, the rubber sleeve is provided with an injection hole, the rubber sleeve is installed with an air injection cylinder, and the first fixed shell is installed with a water injection shell. The present invention continuously performs air tightness detection on the weld by making the water storage shell cover the weld at the connection between the rubber sleeve and the anti-corrosion and thermal insulation layer of the pipeline, thereby reducing the burden on the staff and improving the accuracy of the detection, thereby ensuring the normal operation of the anti-corrosion and thermal insulation layer of the pipeline.

Description

An air tightness detection device for water conservancy project pipeline

Technical Field

The invention relates to the technical field of air tightness detection, and in particular to an air tightness detection device for water conservancy engineering pipelines.

Background Art

When workers install large-scale integrated water conservancy pipelines outdoors, they usually need to wrap an anti-corrosion and thermal insulation layer around the outside of the metal pipeline. After welding the internal metal pipeline and performing strength testing on the inside of the pipeline (the pipeline includes an anti-corrosion and thermal insulation layer and a metal pipeline), workers need to wrap a rubber sleeve around the outside of the metal pipeline welding point to allow the rubber sleeve to fill the gap between the anti-corrosion and thermal insulation layers of the pipelines on both sides. After welding both ends of the rubber sleeve to the anti-corrosion and thermal insulation layers outside the pipelines on both sides, the air tightness of the rubber sleeve should be tested to ensure that the rubber sleeve can play an anti-corrosion and thermal insulation role.

When conducting air tightness test on the rubber sleeve, the staff pumps air into the space between the rubber sleeve and the outside of the metal pipe through the injection hole of the rubber sleeve. After the rubber sleeve is filled with gas of sufficient pressure, water is sprayed to the rubber sleeve welding point through a spray bottle, and the staff lies on the pipe to observe whether there are bubbles coming out of the rubber sleeve welding point, so as to judge whether there is gas leakage at the rubber sleeve welding point. During the test, the staff usually needs to observe the connection several times within 24 hours, which makes it time-consuming and laborious for the staff to use the existing equipment to conduct air tightness test, which seriously consumes the staff's energy. If the leakage position is located at the lower part of the rubber sleeve welding point, it is difficult for water droplets to stay at the rubber sleeve welding point, which makes it difficult for the staff to conduct effective observation, resulting in limited observation effect on the lower side of the rubber sleeve welding point. If there is an air tightness defect at the connection between the rubber sleeve and the pipeline anti-corrosion and thermal insulation layer, it usually leads to a decrease in the anti-corrosion effect of the anti-corrosion and thermal insulation layer at this point, resulting in a shortened service life of the pipeline anti-corrosion and thermal insulation layer.

Summary of the invention

In order to overcome the shortcomings that workers use existing devices to perform air tightness detection, which is time-consuming, labor-intensive and has poor results, the present invention provides an air tightness detection device for water conservancy project pipelines.

The technical solution is: an air tightness detection device for a water conservancy project pipeline, comprising a symmetrically distributed first fixed shell, the first fixed shell is connected to a second fixed shell by bolts, the first fixed shell and the adjacent second fixed shell together constitute a water storage shell, the inner sides of the first fixed shell and the second fixed shell are fixedly connected with uniformly distributed first elastic air bags, a rubber sleeve for sealing detection is welded on the pipeline, the water storage shell, the rubber sleeve, the pipeline and the adjacent first elastic air bag together constitute a water storage cavity, the rubber sleeve is provided with a perfusion hole, the perfusion hole of the rubber sleeve is installed with an air injection cylinder, the upper side of the first fixed shell is installed with a water injection shell, the upper side of the water injection shell is provided with a first valve and a second valve, the water injection shell is connected with the adjacent water storage cavity, a transverse measuring mechanism for detecting the weld in the middle of the rubber sleeve is commonly provided between the symmetrically distributed first fixed shells, an auxiliary fixing mechanism for assisting the adjacent first elastic air bag to fix the adjacent water storage shell is provided on the inner side of the water storage shell, and a gas collecting mechanism for collecting overflow gas is provided on the outer side of the water storage shell.

In addition, it is particularly preferred that the lateral measuring mechanism includes a cover shell, the cover shell is fixed between the symmetrically distributed first fixed shells, the upper portion of the cover shell is provided with a plurality of arcuate surfaces, the upper side of the cover shell is fixed with evenly distributed first gas collecting cylinders, the evenly distributed first gas collecting cylinders are respectively located at the highest points of adjacent arcuate surfaces, a locking valve is provided on the upper side of the first gas collecting cylinders, the lower side of the cover shell is fixed with symmetrically distributed second elastic air bags, the cover shell, the rubber sleeve and the symmetrically distributed second elastic air bags together constitute a middle cavity, and the symmetrically distributed water storage cavities are all connected to the middle cavity.

In addition, it is particularly preferred that the auxiliary fixing mechanism includes two groups of extrusion blocks distributed symmetrically, each group includes the extrusion blocks evenly distributed circumferentially, the two groups of extrusion blocks are respectively slidably connected to the side of the adjacent water storage shell close to the adjacent first elastic airbag, a first elastic member is fixedly connected between the extrusion block and the adjacent water storage shell, a friction block is fixedly connected to the side of the extrusion block away from the adjacent first elastic member, and the friction block is fixedly connected to the adjacent first elastic airbag.

In addition, it is particularly preferred that symmetrically distributed fixing rings are fixedly connected inside the rubber sleeve, and the fixing rings are extruded and fitted with the adjacent friction blocks through the adjacent rubber sleeves.

In addition, it is particularly preferred that the gas collecting mechanism includes a second gas collecting cylinder evenly distributed in the circumference, and the second gas collecting cylinders evenly distributed in the circumference are all slidably connected to the outer sides of adjacent water storage shells. An air storage cavity is provided in the second gas collecting cylinder, and the air storage cavity is communicated and coordinated with the outside, and the air storage cavity is communicated and coordinated with the adjacent water storage cavity. A lower stopper is fixedly connected to the lowermost side of the water storage shell, and an upper stopper is fixedly connected to the uppermost side of the water storage shell, and the upper stopper is fixedly connected to the adjacent water injection shell and separates the first valve and the second valve in the water injection shell, and a sealing member is slidably connected to the side of the second gas collecting cylinder away from the adjacent water storage shell, and the sealing member is sealed and coordinated with the adjacent second gas collecting cylinder, and a second elastic member is installed between the sealing member and the adjacent second gas collecting cylinder, and the water storage shell is provided with limiting components evenly distributed in the circumference and used to limit the adjacent second gas collecting cylinders respectively.

In addition, it is particularly preferred that the height of all the second air collecting cylinders close to the adjacent water storage shell is lower than the height close to the adjacent sealing member, and all the connecting and fitting points between the air storage chambers and the adjacent water storage chambers are located on the lower side of the adjacent second air collecting cylinders.

In addition, it is particularly preferred that the limiting assembly includes a fixed block, which is fixedly connected to an adjacent water storage shell near the adjacent second air collecting cylinder, a limiting ball is slidably connected inside the fixed block, a third elastic member is fixedly connected between the limiting ball and the adjacent fixed block, and the second air collecting cylinder is provided with limiting grooves that are evenly distributed and cooperate with the adjacent limiting balls.

In addition, it is particularly preferred that the second air collecting cylinder located at the bottom of the same water storage shell is slidably connected to a side of the adjacent water storage chamber close to the second air collecting cylinder, an elastic sleeve is fixedly connected between the extrusion plate and the adjacent second air collecting cylinder, and a fourth elastic member is fixedly connected between the extrusion plate and the adjacent second air collecting cylinder.

In addition, it is particularly preferred that all the second air collecting cylinders are sealed with adjacent water storage shells, and the extrusion plate, the adjacent second air collecting cylinder without the extrusion plate, and the inner surface of the adjacent water storage cavity cooperate to form a complete arc surface.

In addition, it is particularly preferred that a pressure-maintaining mechanism for maintaining the gas pressure in the rubber sleeve is further included, and the pressure-maintaining mechanism is arranged on the gas injection cylinder, and the pressure-maintaining mechanism includes a three-way valve, and the three-way valve is installed on the lower side of the gas injection cylinder, and the lower side of the gas injection cylinder is fixedly connected and connected to a pressure gauge, and the gas injection cylinder is slidably connected to a piston rod, and the piston rod divides the cavity in the gas injection cylinder into a first cavity and a second cavity, and the pressure gauge is connected to the first cavity, and two air outlets in the three-way valve are respectively connected to the first cavity and the second cavity, and the gas injection cylinder is equipped with a pressure valve connected to the second cavity, and the pressure valve is connected to the outside.

Compared with the prior art, the present invention has the following advantages: the present invention continuously performs air tightness detection on the weld at the connection between the water storage shell and the anti-corrosion and thermal insulation layer of the pipeline, thereby reducing the burden on the staff and improving the accuracy of the detection, thereby ensuring the normal operation of the anti-corrosion and thermal insulation layer of the pipeline.

On the basis of the above, the present invention determines the approximate location of the leak through the evenly distributed second air collecting cylinder, thereby assisting the staff in searching for defects in the welding between the rubber sleeve and the pipeline anti-corrosion and thermal insulation layer, further reducing the workload of the staff.

On the basis of the above, the present invention divides the gas injection cylinder into a first cavity and a second cavity by a piston rod, maintains the gas pressure in the first cavity by continuous gas injection, and assists the staff to observe the degree of gas leakage in the first cavity, thereby increasing the convenience of the device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a three-dimensional structure of the present invention;

FIG2 is a schematic diagram of the three-dimensional structure of the first elastic airbag, the water storage cavity and the rubber sleeve of the present invention;

FIG3 is a schematic diagram of the shapes of the rubber sleeve and the fixing ring of the present invention;

FIG4 is a cross-sectional view of a first fixed shell and a second fixed shell of the present invention;

FIG5 is a schematic diagram of the three-dimensional structure of the first fixed shell, the second fixed shell and the second gas collecting cylinder of the present invention;

6 is a cross-sectional view of the first fixed shell, the cover shell and the first gas collecting cylinder of the present invention;

FIG7 is a schematic diagram of the three-dimensional structure of the extrusion block, the first elastic member and the friction block of the present invention;

FIG8 is a schematic diagram of the three-dimensional structure of the fixing block, the limiting ball and the third elastic member of the present invention;

FIG9 is a schematic diagram of the three-dimensional structure of the second gas collecting cylinder, the extrusion plate and the elastic sleeve of the present invention;

FIG10 is a cross-sectional view of the second air collecting cylinder, the fixing block and the elastic sleeve of the present invention;

FIG11 is an exploded view of the second gas collecting cylinder, the extrusion plate and the elastic sleeve of the present invention;

FIG12 is a schematic diagram of the three-dimensional structure of the gas injection cylinder, the three-way valve and the piston rod of the present invention;

FIG. 13 is a schematic diagram of the three-dimensional structure of the gas injection cylinder, the first cavity and the second cavity of the present invention.

In the figure: 1. first fixed shell, 2. second fixed shell, 3. first elastic air bag, 301. water storage chamber, 4. rubber sleeve, 6. air injection cylinder, 601. first cavity, 602. second cavity, 7. water injection shell, 8. covering shell, 9. first air collecting cylinder, 10. second elastic air bag, 11. extrusion block, 12. first elastic member, 13. friction block, 14. fixing ring, 15. second air collecting cylinder, 16. lower stopper, 17. upper stopper, 18. blocking member, 19. second elastic member, 20. fixing block, 21. limiting ball, 22. third elastic member, 23. extrusion plate, 231. elastic sleeve, 24. fourth elastic member, 25. three-way valve, 26. piston rod, 27. pressure valve.

DETAILED DESCRIPTION

Although the present invention can be described with respect to specific applications or industries, those skilled in the art will recognize the wider applicability of the present invention. Those of ordinary skill in the art will recognize that any numerical designations such as: first or second are only exemplary and are not intended to limit the scope of the present invention in any way.

Example 1: When the staff uses the existing device to perform air tightness test on the welding joint of the rubber sleeve and the anti-corrosion and thermal insulation layer of the pipeline, the staff is required to concentrate on observing whether the water sprayed on the pipeline is bubbling, which seriously consumes the staff's mind. In addition, the existing device cannot assist the staff to observe the bottom of the welding joint of the rubber sleeve and the anti-corrosion and thermal insulation layer of the pipeline, which may easily lead to inaccurate test results by the staff. If there is an air tightness defect in the welding joint of the rubber sleeve and the anti-corrosion and thermal insulation layer of the pipeline, it will directly affect the anti-corrosion and thermal insulation performance of the pipeline at that location, and have an adverse effect on the long-term use of the pipeline.

In view of the above problems, the present invention proposes an air tightness detection device for water conservancy engineering pipelines, as shown in Figures 1 to 5, comprising two first fixed shells 1 symmetrically distributed on the left and right, the first fixed shell 1 being connected to the second fixed shell 2 by bolts, the first fixed shell 1 and the adjacent second fixed shell 2 together forming a water storage shell, a rubber sleeve 4 for sealing detection is welded on the pipeline anti-corrosion and thermal insulation layer, an opening is provided on the upper side of the rubber sleeve 4, so that the staff can conveniently set the rubber sleeve 4 on the outside of the metal pipeline, and after the staff welds the rubber sleeve 4 to the pipeline anti-corrosion and thermal insulation layer, the staff can simultaneously The opening of the rubber sleeve 4 is welded, and the water storage shell is used to cover the upper side of the welding place between the pipeline anti-corrosion and thermal insulation layer and the rubber sleeve 4, and the air tightness test is performed on the place. The inner sides of the first fixed shell 1 and the second fixed shell 2 are fixedly connected with uniformly distributed first elastic air bags 3, and the first elastic air bags 3 are connected to the external air pump. The first elastic air bags 3 are used to maintain the sealing connection between the adjacent first fixed shell 1 and the adjacent second fixed shell 2 and the pipeline anti-corrosion and thermal insulation layer and the rubber sleeve 4. The water storage shell, the rubber sleeve 4, the pipeline anti-corrosion and thermal insulation layer and the adjacent first elastic air bags 3 together form a water storage chamber 30 1, by filling the water storage chamber 301 with water, the gas ejected from the connection between the rubber sleeve 4 and the metal pipe forms bubbles in the water storage chamber 301, and the sealing of the connection between the rubber sleeve 4 and the pipe anti-corrosion insulation layer is detected. The rubber sleeve 4 is provided with a perfusion hole, which is used to inject gas between the rubber sleeve 4 and the metal pipe during the detection stage, and a foaming agent is injected between the rubber sleeve 4 and the metal pipe after the detection is completed to form an insulation layer. The perfusion hole of the rubber sleeve 4 is installed with a gas injection cylinder 6, which is connected to an external air pump. The upper side of the first fixed shell 1 is provided with a gas injection cylinder 6. The water shell 7, a first valve and a second valve are arranged on the upper side of the water injection shell 7, the first valve on the water injection shell 7 is connected to an external water pump, the water injection shell 7 is connected to an adjacent water storage chamber 301, the first fixed shell 1, the second fixed shell 2 and the water injection shell 7 are all made of transparent materials, a lateral measuring mechanism for detecting the weld at the opening on the rubber sleeve 4 is arranged between the two first fixed shells 1, an auxiliary fixing mechanism for assisting the adjacent first elastic airbags 3 to fix the adjacent water storage shells is arranged on the inner side of the water storage shell, and a gas collecting mechanism for collecting overflowed gas is arranged on the outer side of the water storage shell.

As shown in Figures 2, 5 and 6, the lateral measuring mechanism includes a covering shell 8 fixedly connected between the two first fixed shells 1, and three arc-shaped surfaces are arranged on the upper part of the covering shell 8. The arc-shaped surfaces are used to guide the bubbles, so as to facilitate the staff to more accurately determine the location of the leakage. Three evenly distributed first gas collecting cylinders 9 are fixedly connected to the upper side of the covering shell 8. The first gas collecting cylinders 9 are used to collect bubbles. The three first gas collecting cylinders 9 are respectively located at the highest points of adjacent arc-shaped surfaces. A locking valve is arranged on the upper side of the first gas collecting cylinder 9. The locking valve is opened when water is injected into the covering shell 8. Open, it is convenient to discharge all the gas in the covering shell 8, two second elastic air bags 10 symmetrically distributed front and back are fixed to the lower side of the covering shell 8, the second elastic air bags 10 are used to maintain the seal between the covering shell 8 and the rubber sleeve 4, the second elastic air bags 10 are connected to the external air pump, the covering shell 8, the rubber sleeve 4 and the symmetrically distributed second elastic air bags 10 together constitute a middle cavity, the weld at the opening of the rubber sleeve 4 is completely wrapped in the middle cavity, the air tightness of the weld at the opening of the rubber sleeve 4 is tested, and the two water storage chambers 301 are connected to the middle cavity.

As shown in Figures 2 to 5 and 7, the auxiliary fixing mechanism includes two groups of extrusion blocks 11 that are symmetrically distributed front to back, and each group includes four extrusion blocks 11 that are evenly distributed circumferentially. The two groups of extrusion blocks 11 are respectively slidably connected to one side of the adjacent water storage shell close to the adjacent first elastic airbag 3. A first elastic member 12 is fixedly connected between the extrusion block 11 and the adjacent water storage shell. The first elastic member 12 is a spring. Friction blocks 13 are fixedly connected to the inner sides of the same group of extrusion blocks 11. The friction blocks 13 provide force to prevent the water storage shell from slipping by rigidly contacting the pipeline anti-corrosion and thermal insulation layer and the rubber sleeve 4, thereby ensuring that the water storage shell always covers the welding point between the pipeline anti-corrosion and thermal insulation layer and the rubber sleeve 4. A fixing ring 14 that is symmetrically distributed left and right is fixedly connected in the rubber sleeve 4. The fixing ring 14 is used to provide support for the rubber sleeve 4. The fixing ring 14 and the adjacent friction block 13 are squeezed and matched with the adjacent rubber sleeve 4 to avoid inward depression when the rubber sleeve 4 is not filled with gas, resulting in the adjacent water storage shell being unable to be fixed. The friction block 13 is fixedly connected to the adjacent first elastic airbag 3.

As shown in Figures 4, 5 and 7-9, the gas collecting mechanism includes six second gas collecting cylinders 15 uniformly distributed in the circumferential direction. The second gas collecting cylinders 15 are made of transparent material. All second gas collecting cylinders 15 are slidably connected to the outside of the adjacent water storage shell. An air storage cavity is arranged in the second gas collecting cylinder 15. The air storage cavity is connected and coordinated with the outside. The air storage cavity is connected and coordinated with the adjacent water storage cavity 301. All second gas collecting cylinders 15 are inclined, and the height of the second gas collecting cylinder 15 close to the adjacent water storage shell is lower than the height of the second gas collecting cylinder 15 away from the adjacent water storage shell, which is used to ensure the flow direction of the bubbles and promote the bubbles to correctly enter the adjacent second gas collecting cylinder 15. The connection points of all air storage cavities and adjacent water storage cavities 301 are located at the lower side of the adjacent second gas collecting cylinder 15. The lowermost side in the water storage shell is fixedly connected to a lower stopper 16. The block 16 is used to separate the flow direction of the bubbles on the lower side. An upper block 17 is fixedly connected to the uppermost side of the water storage shell. The upper block 17 is fixedly connected to the adjacent water injection shell 7. The upper block 17 is used to separate the first valve and the second valve in the water injection shell 7, and separately collect the bubbles on both sides while ensuring smooth discharge of gas during water injection. A sealing member 18 is slidably connected to the connection between the second gas collecting cylinder 15 and the outside world. The sealing member 18 is sealed with the adjacent second gas collecting cylinder 15. A second elastic member 19 is installed between the sealing member 18 and the adjacent second gas collecting cylinder 15. The second elastic member 19 is a spring. The second elastic member 19 is initially in a stored force state, which is used to automatically block the connection between the second gas collecting cylinder 15 and the outside world. The water storage shell is provided with circumferentially evenly distributed limit components and are respectively used to limit the adjacent second gas collecting cylinders 15.

As shown in Figures 7 to 10, the limiting assembly includes a fixed block 20 fixedly connected to the adjacent water storage shell near the adjacent second gas collecting cylinder 15, a limiting ball 21 is slidably connected in the fixed block 20, a third elastic member 22 is fixedly connected between the limiting ball 21 and the adjacent fixed block 20, the third elastic member 22 is a spring, and the second gas collecting cylinder 15 is provided with two limiting grooves that are evenly distributed and both cooperate with the adjacent limiting ball 21. The limiting ball 21 is used to limit the position of the second gas collecting cylinder 15 to prevent the second gas collecting cylinder 15 from deviating from the position and affecting the gas collection effect.

As shown in Figures 9 to 11, the second gas collecting cylinder 15 located at the lowermost side on the same water storage shell is slidably connected to a side close to the adjacent water storage chamber 301 with an extrusion plate 23. During the sliding process of the extrusion plate 23 relative to the second gas collecting cylinder 15, the extrusion plate 23 synchronously rotates relative to the second gas collecting cylinder 15. When the extrusion plate 23 is aligned with the adjacent water storage shell, the inner wall of the water storage chamber 301 is smooth and has no gaps. An elastic sleeve 231 is fixedly connected between the extrusion plate 23 and the adjacent second gas collecting cylinder 15. The elastic sleeve 231 is used to connect the extrusion plate 23 and the adjacent second gas collecting cylinder 15 to prevent gas from passing between the adjacent extrusion plate 23 and the adjacent second gas collecting cylinder 15, so as to increase the accuracy of gas collection by the adjacent second gas collecting cylinder 15. The extrusion plate 23 is fixedly connected to the adjacent second gas collecting cylinder 15. The fourth elastic member 24 is a tension spring. The center of rotation of the extrusion plate 23 and the adjacent second gas collecting cylinder 15 when they rotate relative to each other is located at the lower side thereof. Therefore, when the extrusion plate 23 contacts the pipeline anti-corrosion and thermal insulation layer, the extrusion plate 23 rotates synchronously along the lower side thereof while sliding relative to the adjacent second gas collecting cylinder 15, so that the contact point between the extrusion plate 23 and the pipeline anti-corrosion and thermal insulation layer is transferred to the lower side thereof. All second gas collecting cylinders 15 are sealed with adjacent water storage shells. The extrusion plate 23 cooperates with the adjacent and not lowermost second gas collecting cylinder 15 and the inner surface of the adjacent water storage chamber 301 to form a complete arc surface, thereby ensuring that when water is injected into the water storage chamber 301, no gas is intercepted by the protruding second gas collecting cylinder 15 or the protruding extrusion plate 23, so that the gas in the water storage chamber 301 is discharged smoothly.

After welding the inner layers of the metal pipes on both sides and performing strength tests on the metal pipes, the staff installed the fixing ring 14 on the left and right sides of the rubber sleeve 4. Then the staff welded the left and right sides of the rubber sleeve 4 to the anti-corrosion and thermal insulation layer of the pipes on both sides, and ensured that the outer surface of the rubber sleeve 4 was flush with the outer surface of the anti-corrosion and thermal insulation layer of the pipes on both sides, and the opening of the rubber sleeve 4 was facing directly upwards. During the welding process, the staff welded the opening on the upper side of the rubber sleeve 4 together to form a complete circular sleeve. Then the staff prepared to perform an airtightness test on the connection between the pipe anti-corrosion and thermal insulation layer and the rubber sleeve 4 to verify the airtightness of the welding structure.

When the staff conducts air tightness test on the connection between the pipeline anti-corrosion insulation layer and the rubber sleeve 4, it is necessary to install the two water storage shells respectively at the welding points of the rubber sleeve 4 and the adjacent rubber layer, and ensure that the welding points are located in the water storage chamber 301. The staff first presses the second fixed shell 2 on the back side of the rubber sleeve 4 and the adjacent rubber layer, and then presses the first fixed shell 1 on the front side of the rubber sleeve 4 and the adjacent rubber layer. The following takes the example of the parts on the first fixed shell 1 being pressed onto the rubber sleeve 4. When the staff presses the first fixed shell 1 onto the rubber sleeve 4, the friction block 13 on the first fixed shell 1 first contacts the rubber sleeve 4, and the friction block 13 and the extrusion block 11 are stopped by resistance and move with the adjacent first fixed shell 1. When the first fixed shell 1 continues to move, the extrusion block 11 moves toward the adjacent first fixed Shell 1 moves, the adjacent first elastic member 12 is compressed and stored, the first elastic member 12 provides extrusion force to the extrusion block 11 and the friction block 13, so that the friction block 13 and the rubber sleeve 4 are extruded and matched. At this time, the fixing ring 14 in the rubber sleeve 4 provides support force to the friction block 13, and the friction block 13 limits the adjacent first fixed shell 1 by extruding against the rubber sleeve 4, so as to avoid the first fixed shell 1 from being misplaced during the measurement process and other unexpected situations, which affect the measurement results. When the first fixed shell 1 contacts the adjacent second fixed shell 2, the staff fixes the relative position of the first fixed shell 1 and the adjacent second fixed shell 2 by bolts, so that the first fixed shell 1 and the adjacent second fixed shell 2 form a complete water storage shell, and the water storage shell is fixed to the pipeline anti-corrosion insulation layer and the rubber sleeve 4 through the adjacent friction block 13.

During the installation of the first fixed shell 1, the staff always keeps the water injection shell 7 directly above. At this time, the covering shell 8 and adjacent parts are located directly above the opening of the rubber sleeve 4, and the middle cavity just covers the welding point of the opening of the rubber sleeve 4. The sealing of the opening of the rubber sleeve 4 is tested. After the staff has installed the water storage shells on both sides, they use the air pump to inflate all the second elastic air bags 10 and all the first elastic air bags 3. The first elastic air bags 3 are inflated to complete the sealing of the water storage shell and the adjacent rubber sleeve 4 and the adjacent rubber layer. After the second elastic air bag 10 is inflated, the sealing between the rubber sleeve 4 and the covering shell 8 is completed. Then the staff installs the air injection cylinder 6 at the injection hole reserved on the rubber sleeve 4. The staff starts the air pump to inflate the rubber sleeve 4 through the air injection cylinder 6. After ensuring that a certain pressure of gas is filled between the rubber sleeve 4 and the metal pipe, the staff turns off the air pump and inflates it through the water The pump slowly injects water into the adjacent water storage chamber 301 through the first valve on the water injection shell 7. The air in the water storage chamber 301 gradually flows upward, and the gas is mainly discharged through the second valve on the water injection shell 7. Because the inner wall of the water storage shell is relatively smooth, the gas discharge process will not be hindered by the second gas collecting cylinder 15 and other parts, reducing the probability of bubbles remaining in the water storage chamber 301. When the water level gradually rises to the covering shell 8, the water gradually flows into the middle cavity through the connection between the adjacent water storage chamber 301 and the middle cavity. At this time, the staff opens the locking valve in the first gas collecting cylinder 9 to facilitate the normal discharge of gas on the upper side of the covering shell 8. When the water gradually fills the water storage chamber 301, the middle cavity and the water injection shell 7, the water gushes out from the locking valve on the first gas collecting cylinder 9 and the second valve on the water injection shell 7. The staff closes all the locking valves on the first gas collecting cylinder 9. At this time, the two water storage chambers 301 and the middle cavity are all full of water.

After water gushes out from the second valve on the water injection shell 7, the staff pushes the adjacent second air collecting cylinder 15 into the adjacent water storage shell from bottom to top in sequence. The specific steps are as follows:

When the staff pushes the second gas collecting cylinder 15 on the lowermost side, because the initial position of the second gas collecting cylinder 15 is limited by the adjacent limiting ball 21 on the adjacent fixing block 20, the staff needs to apply a larger force to overcome the resistance applied by the adjacent third elastic member 22 on the adjacent limiting ball 21. When the staff applies enough force, the second gas collecting cylinder 15 moves into the adjacent water storage shell, and the second gas collecting cylinder 15 retracts into the adjacent fixing block 20 by squeezing the adjacent limiting ball 21 through the limiting groove, and the third elastic member 22 compresses and accumulates force. When the second gas collecting cylinder 15 moves to the point where the extrusion plate 23 thereon contacts the outer wall of the anti-corrosion and thermal insulation layer of the pipeline, the upper side of the extrusion plate 23 contacts the anti-corrosion and thermal insulation layer of the pipeline first, and the staff continues to push the second gas collecting cylinder 15 into the adjacent water storage shell, and the extrusion plate 23 continues to As the adjacent second gas collecting cylinder 15 moves into the water storage shell, the extrusion plate 23 gradually slides relative to the adjacent second gas collecting cylinder 15, the fourth elastic member 24 stretches and accumulates force, and the extrusion plate 23 deflects along the sliding path until the lowermost side of the extrusion plate 23 contacts the pipeline anti-corrosion and thermal insulation layer. At this time, the upper side of the extrusion plate 23 is tilted away from the pipeline anti-corrosion and thermal insulation layer, thereby ensuring that the lowermost second gas collecting cylinder 15 effectively intercepts the bubbles floating upward from its lower side. At this time, the air storage cavity in the second gas collecting cylinder 15 is completely connected with the water storage shell, and the adjacent limiting ball 21 on the adjacent fixed block 20 is aligned with the upper limiting groove of the adjacent second gas collecting cylinder 15. The limiting ball 21 is reinserted into the limiting groove of the adjacent second gas collecting cylinder 15 under the action of the adjacent third elastic member 22 to limit the position of the second gas collecting cylinder 15.

When the staff pushes the second gas collecting cylinder 15 at other positions, it is pushed according to the same principle to the point where the adjacent limiting ball 21 and the upper limiting groove of the adjacent second gas collecting cylinder 15 are re-matched. At this time, all the second gas collecting cylinders 15 maintain contact with the pipeline anti-corrosion and thermal insulation layer on the lower side, and the slightly raised shape of the upper side will not affect the outflow of bubbles at the contact point between the second gas collecting cylinder 15 and the pipeline anti-corrosion and thermal insulation layer. When the staff has pushed all the second gas collecting cylinders 15 to the specified position, the staff presses the sealing member 18 on each second gas collecting cylinder 15 in sequence. When the sealing member 18 is pressed, it moves into the adjacent second gas collecting cylinder 15, and the second elastic member 19 is compressed and accumulates force to connect the adjacent air storage chamber with the outside world, and the water in the adjacent water storage chamber 301 flows into the adjacent air storage chamber, squeezing the gas to be discharged outward. When the staff observes that the gas in the air storage chamber is drained and water oozes out from the sealing member 18, he stops pressing the sealing member 18, and the second elastic member 19 pushes the sealing member 18 to accumulate force to seal the connection between the adjacent air storage chamber and the outside world.

When the air in all the air storage chambers is exhausted, the water pump is controlled to stop injecting water into the first valve of the water injection shell 7, and the first valve and the second valve are closed. At this time, the two water storage chambers 301 and the middle cavity are filled with water. When a sealing defect occurs at the welding point between the rubber sleeve 4 and the pipeline anti-corrosion and thermal insulation layer, gas flows out from the rubber sleeve 4 from the defect and flows into the adjacent water storage chamber 301 to form bubbles. Water enters the rubber sleeve 4 simultaneously. Then the bubbles move upward in the water and are intercepted by the adjacent and upper second gas collecting cylinder 15, enter the gas storage chamber of the adjacent second gas collecting cylinder 15, and The gas is gathered at the top, and the staff observes the air storage chambers of all the second gas collecting cylinders 15 at regular intervals. Whether there is gathered gas in the second gas collecting cylinder 15, the water injection shell 7 and the first gas collecting cylinder 9 determines whether there is gas leakage, and the approximate location of the sealing defect is determined by observing the positions of the second gas collecting cylinder 15, the water injection shell 7 and the first gas collecting cylinder 9 that collect gas. Then the staff continues to add gas to the rubber sleeve 4 through the gas injection cylinder 6 to increase the air pressure in the rubber sleeve 4 and increase the amount of gas leakage. The staff finds the gas leakage position by observing the water storage shell, and finally repairs the leakage position as a whole.

After the inspection is completed, the staff disassembles all the first fixed shells 1 and all the second fixed shells 2 according to the same principle, recovers the device, and injects thermal insulation foaming agent into the rubber sleeve 4 through the injection hole to fill its inner cavity. Finally, the staff seals the injection hole to complete the entire inspection process.

Embodiment 2: The existing air tightness detection device will only inject gas of a fixed pressure value into the space between the rubber sleeve and the metal pipe. Once the gas leaks, the air pressure between the rubber sleeve and the metal pipe will gradually decrease as the gas leaks, slowing down the gas leakage rate. This will undoubtedly increase the difficulty for the staff to observe the gas leakage.

In view of the above problems, on the basis of Example 1, in combination with Figures 12 and 13, it also includes a pressure-maintaining mechanism arranged on the gas injection cylinder 6, the pressure-maintaining mechanism is used to maintain the pressure of the gas in the rubber sleeve 4, the pressure-maintaining mechanism includes a three-way valve 25 installed on the lower side of the gas injection cylinder 6, the lower side of the gas injection cylinder 6 is fixedly connected and connected to a pressure gauge, the pressure gauge is convenient for the staff to determine the air pressure in the rubber sleeve 4, the gas injection cylinder 6 is slidably connected to the piston rod 26, the piston rod 26 divides the cavity in the gas injection cylinder 6 into a first cavity 601 and a second cavity 602, the pressure gauge is connected to the first cavity 601, and the two gas outlets in the three-way valve 25 are respectively connected to the first cavity 601 and the second cavity 602. Cavity 601 is connected to the second cavity 602, and the air inlet of the three-way valve 25 is connected to the air pump, wherein the diameter of the connection point between the three-way valve 25 and the second cavity 602 is relatively small, and is only used to slowly inject air into the second cavity 602. The gas injection cylinder 6 is equipped with a pressure valve 27 connected to the second cavity 602. The air pressure of the gas injected into the second cavity 602 is controlled by the pressure valve 27 to ensure that the air pressure in the second cavity 602 is the same as the air pressure in the first cavity 601. Subsequently, the air pressure in the first cavity 601 is kept unchanged through the piston rod 26 when the gas leaks, so as to facilitate the staff to find the leak. The pressure valve 27 is connected to the outside world.

When the staff injects gas into the rubber sleeve 4 through the gas injection cylinder 6, they first open the three-way valve 25 to a position connected only to the first cavity 601. At this time, the air pump injects gas into the rubber sleeve 4 through the first cavity 601 and pushes the pressure gauge to rotate, so that the staff can observe the air pressure of the injected gas. At this time, the piston rod 26 is pushed by the gas to move to the uppermost side of the gas injection cylinder 6. When enough air is injected into the rubber sleeve 4, the staff rotates the three-way valve 25 to connect the air pump with the first cavity 601 and connect the air pump with the second cavity 602. The staff simultaneously reduces the efficiency of the air pump and supplies air to the second cavity 602 through the air pump. When the air pressure in the second cavity 602 is equal to the air pressure injected by the staff in the first cavity 601, the gas pressure on both sides of the piston rod 26 remains balanced. At this time, the air pressure in the second cavity 602 is the same as the pressure limited by the pressure valve 27, and the gas gushes outward from the pressure valve 27. Then the staff waits to observe the test results. If a leak occurs in the rubber sleeve 4, the air pressure in the rubber sleeve 4 gradually decreases, that is, the air pressure in the first cavity 601 gradually decreases. At this time, the piston rod 26 gradually moves downward to ensure that the pressures on both sides are balanced, and the piston rod 26 moves downward to squeeze the gas in the first cavity 601, thereby causing the gas pressure in the first cavity 601 and the rubber sleeve 4 to maintain a relatively balanced state, avoiding the gas leakage rate caused by the reduction of the gas pressure in the rubber sleeve 4 when the gas leaks, which is inconvenient for the staff to observe. The staff can also judge whether there is a leak at the connection between the rubber sleeve 4 and the pipeline anti-corrosion insulation layer by observing the position of the piston rod 26.

The above description is only an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included in the protection scope of the present invention. The contents not elaborated in detail in the present invention belong to the existing technologies known to those skilled in the art.

Claims (9)

1. An air tightness detection device for a water conservancy project pipeline, characterized in that: it comprises a symmetrically distributed first fixed shell (1), the first fixed shell (1) is connected to a second fixed shell (2) by bolts, the first fixed shell (1) and the adjacent second fixed shell (2) together form a water storage shell, the inner sides of the first fixed shell (1) and the second fixed shell (2) are fixedly connected with uniformly distributed first elastic air bags (3), a rubber sleeve (4) for sealing detection is welded on the pipeline, the water storage shell, the rubber sleeve (4), the pipeline and the adjacent first elastic air bag (3) together form a water storage chamber (301), and the rubber sleeve (4) is provided with A filling hole is provided, an air injection cylinder (6) is installed on the filling hole of the rubber sleeve (4), a water injection shell (7) is installed on the upper side of the first fixed shell (1), a first valve and a second valve are provided on the upper side of the water injection shell (7), the water injection shell (7) is communicated with the adjacent water storage chamber (301), a transverse measuring mechanism for detecting the middle weld of the rubber sleeve (4) is provided between the symmetrically distributed first fixed shells (1), an auxiliary fixing mechanism for assisting the adjacent first elastic airbag (3) to fix the adjacent water storage shell is provided on the inner side of the water storage shell, and a gas collecting mechanism for collecting overflow gas is provided on the outer side of the water storage shell; The lateral measurement mechanism comprises a covering shell (8), the covering shell (8) being fixedly connected between the symmetrically distributed first fixed shells (1), the upper part of the covering shell (8) being provided with a plurality of arcuate surfaces, the upper side of the covering shell (8) being fixedly connected with evenly distributed first gas collecting cylinders (9), the evenly distributed first gas collecting cylinders (9) being respectively located at the highest points of adjacent arcuate surfaces, the upper side of the first gas collecting cylinders (9) being provided with a locking valve, the lower side of the covering shell (8) being fixedly connected with symmetrically distributed second elastic air bags (10), the covering shell (8), the rubber sleeve (4) and the symmetrically distributed second elastic air bags (10) together forming a middle cavity, the upper side of the rubber sleeve (4) being provided with an opening, the weld at the opening of the rubber sleeve (4) being completely wrapped in the middle cavity, the air tightness of the weld at the opening of the rubber sleeve (4) being tested, and the symmetrically distributed water storage chambers (301) are all connected to the middle cavity. 2. An air tightness detection device for a water conservancy project pipeline according to claim 1, characterized in that: the auxiliary fixing mechanism includes two groups of symmetrically distributed extrusion blocks (11), each group includes the extrusion blocks (11) uniformly distributed in the circumferential direction, the two groups of the extrusion blocks (11) are respectively slidably connected to the side of the adjacent water storage shell close to the adjacent first elastic airbag (3), a first elastic member (12) is fixedly connected between the extrusion block (11) and the adjacent water storage shell, a friction block (13) is fixedly connected to the side of the extrusion block (11) away from the adjacent first elastic member (12), and the friction block (13) is fixedly connected to the adjacent first elastic airbag (3). 3. An air tightness detection device for a water conservancy project pipeline according to claim 2, characterized in that: symmetrically distributed fixing rings (14) are fixedly connected inside the rubber sleeve (4), and the fixing ring (14) and the adjacent friction block (13) are squeezed and matched through the adjacent rubber sleeve (4). 4. An air tightness detection device for a water conservancy project pipeline according to claim 1, characterized in that: the air collecting mechanism includes a second air collecting cylinder (15) evenly distributed in the circumferential direction, the second air collecting cylinder (15) evenly distributed in the circumferential direction is slidably connected to the outer side of an adjacent water storage shell, an air storage cavity is arranged in the second air collecting cylinder (15), the air storage cavity is communicated with the outside, the air storage cavity is communicated with the adjacent water storage cavity (301), a lower stopper (16) is fixedly connected to the lowermost side of the water storage shell, an upper stopper (17) is fixedly connected to the uppermost side of the water storage shell, and the upper The stopper (17) is fixedly connected to the adjacent water injection shell (7) and separates the first valve and the second valve in the water injection shell (7); a sealing member (18) is slidably connected to the side of the second gas collecting cylinder (15) away from the adjacent water storage shell; the sealing member (18) is in sealing cooperation with the adjacent second gas collecting cylinder (15); a second elastic member (19) is installed between the sealing member (18) and the adjacent second gas collecting cylinder (15); and the water storage shell is provided with circumferentially evenly distributed limiting components respectively used for limiting the adjacent second gas collecting cylinders (15). 5. An air tightness detection device for a water conservancy project pipeline according to claim 4, characterized in that: the height of all the second air collecting cylinders (15) close to the adjacent water storage shell is lower than the height of the side close to the adjacent blocking member (18), and the connecting and matching points between all the air storage chambers and the adjacent water storage chambers (301) are located at the lower side of the adjacent second air collecting cylinders (15). 6. An air tightness detection device for a water conservancy project pipeline according to claim 5, characterized in that: the limiting assembly includes a fixed block (20), the fixed block (20) is fixedly connected to an adjacent water storage shell near the adjacent second air collecting cylinder (15), a limiting ball (21) is slidably connected inside the fixed block (20), a third elastic member (22) is fixedly connected between the limiting ball (21) and the adjacent fixed block (20), and the second air collecting cylinder (15) is provided with limiting grooves that are evenly distributed and all cooperate with the adjacent limiting balls (21). 7. An air tightness detection device for a water conservancy project pipeline according to claim 6, characterized in that: the second air collecting cylinder (15) located at the lowermost side on the same water storage shell is slidably connected to a side close to the adjacent water storage chamber (301) with an extrusion plate (23), an elastic sleeve (231) is fixedly connected between the extrusion plate (23) and the adjacent second air collecting cylinder (15), and a fourth elastic member (24) is fixedly connected between the extrusion plate (23) and the adjacent second air collecting cylinder (15). 8. An air tightness detection device for a water conservancy project pipeline according to claim 7, characterized in that: all the second air collecting cylinders (15) are sealed with adjacent water storage shells, and the inner surface of the extrusion plate (23), the adjacent second air collecting cylinder (15) not provided with the extrusion plate (23), and the adjacent water storage cavity (301) cooperate to form a complete arc surface. 9. An air tightness detection device for a water conservancy project pipeline according to claim 1, characterized in that it also includes a pressure maintaining mechanism for maintaining the gas pressure in the rubber sleeve (4), the pressure maintaining mechanism is arranged on the gas injection cylinder (6), the pressure maintaining mechanism includes a three-way valve (25), the three-way valve (25) is installed on the lower side of the gas injection cylinder (6), the lower side of the gas injection cylinder (6) is fixedly connected to and connected with a pressure gauge, the gas injection cylinder (6) is slidably connected with a piston rod (26), the piston rod (26) divides the cavity in the gas injection cylinder (6) into a first cavity (601) and a second cavity (602), the pressure gauge is connected to the first cavity (601), two gas outlets in the three-way valve (25) are respectively connected to the first cavity (601) and the second cavity (602), the gas injection cylinder (6) is installed with a pressure valve (27) connected to the second cavity (602), and the pressure valve (27) is connected to the outside.