Plugging device for pipeline hydrostatic test and hydrostatic test method

Abstract

The invention provides a plugging device for a pipeline hydrostatic test and a hydrostatic test method. The plugging device comprises a pipeline; the plugging device is used for sealing the pipeline in the hydrostatic test method and is arranged at the outlet end of the pipeline. The extending end of the hydraulic cylinder pushes the release sealing end to extend out of the sleeve and enter the pipeline, it can be guaranteed that when the release sealing end extends into the pipeline, the servo motor drives the lead screw to rotate, then the lead screw nut continuously moves in the transverse direction of the lead screw, and therefore the release sealing end can be effectively released. The arc-shaped sealing face is pushed to be unfolded in the longitudinal direction of the pipeline, the arc-shaped sealing face can be tightly attached to or press the inner wall of the pipeline, a better contact face is formed, the sealing performance is enhanced, the sealing performance is further improved, and meanwhile high stability can be kept in the high-pressure water pressure test process.

Description

Technical Field

[0001] The invention belongs to the technical field of water pressure testing, and in particular relates to a plugging device and a water pressure testing method for a pipeline water pressure test. Background Art

[0002] Pipeline hydrostatic test is a common test method for pipeline systems, which is used to check the sealing, strength and structural safety of pipelines under working pressure. By injecting water or other liquids and pressurizing them to the specified test pressure, the pipeline is observed to see if there are any problems such as leakage and deformation, so as to ensure that the pipeline can operate safely and reliably in actual use.

[0003] At present, there is no specific and effective device to achieve pipe end sealing. Most existing pipe end sealing devices use flange sealing, and seals are usually installed between flanges to ensure that there is no water leakage during the test. However, in actual application, under the action of pressure, the flange seal will loosen or even be damaged, thus affecting the sealing effect.

[0004] In view of this, how to solve the defects existing in the above technical solutions has become one of the problems to be solved urgently in the field of water pressure testing technology. Summary of the invention

[0005] In view of the problems existing in the background technology, the present invention provides, on one hand, a plugging device and a hydraulic pressure test method for a pipeline, comprising:

[0006] pipeline;

[0007] A plugging device that seals the pipe during the hydrostatic test method, and

[0008] is arranged at the outlet end of the pipeline;

[0009] Sealing components, and

[0010] The sealing assembly is fixed by a fastening connector, and

[0011] The blocking device and the sealing assembly are integrated;

[0012] The blocking device comprises a sleeve, and

[0013] The sleeve is mounted on the hydraulic cylinder, and

[0014] The sleeve is located inside the pipe, and

[0015] The sleeve also includes a release seal end located inside,

[0016] The release seal end portion extends in a transverse direction;

[0017] The hydraulic cylinder also includes an extended end portion, and

[0018] The release seal end is pushed to move in the sleeve by the extended end, and

[0019] The release seal end is pushed out of the release port of the sleeve so that

[0020] The release seal end enters the interior of the pipe.

[0021] Optionally, the extended end of the hydraulic cylinder extends into the sleeve, and

[0022] By installing a hydraulic seat,

[0023] A servo motor is arranged on the end surface of the hydraulic seat, and

[0024] The output end of the servo motor is connected to the lead screw through a bearing assembly, and

[0025] The lead screw is provided with a lead screw nut for spiral transmission therewith, and

[0026] The screw nut is provided with a connecting rod for disassembly connection.

[0027] The connecting rod is connected to the arc-shaped sealing surface through a connector, and

[0028] The other end of the arc-shaped sealing surface is mounted on the connecting piece, and

[0029] The connecting member is installed on the end surface of the screw far away from the hydraulic cylinder;

[0030] The arc-shaped sealing surface of the release seal end is arranged in an arc shape along the lateral extension direction, and

[0031] The arc-shaped sealing surface is made of elastic materials such as rubber.

[0032] Optionally, the sealing assembly includes an outer sealing member and an inner sealing member arranged radially, and the two are arranged in an integrated manner.

[0033] The outer seal also includes a static sealing ring,

[0034] The inner seal comprises a stopper and a transverse sealing lip,

[0035] The blocking member extends continuously in the longitudinal direction, and

[0036] After two bends, a sealing edge is formed, and the sealing edge is longitudinally and

[0037] extends continuously in the direction of the transverse sealing lip, and

[0038] It contacts the end face of the static sealing ring to form a contact seal.

[0039] Optionally, the static sealing ring is provided with a support structure integrally provided therewith.

[0040] The outer sealing member is made of elastic materials such as rubber;

[0041] The support structure extends continuously along direction v, and

[0042] Two sets of sealing legs extending in opposite directions are provided, and

[0043] The two groups of sealing legs respectively contact the inclined ends of the sealing edge and the longitudinal ends of the transverse sealing lip to form a contact seal.

[0044] An arc-shaped end portion protruding outward is arranged on the end surface of the sealing leg close to the transverse sealing lip, and at least one group of sealing contact edges is arranged on the transverse end surface close to the transverse sealing lip.

[0045] A sealed isolation channel is formed by the sealing edge, the supporting structure and the transverse sealing lip.

[0046] Optionally, the stopper, the static sealing ring and the supporting structure enclose a gas-filled cavity, and

[0047] The outer sealing member is provided with a gas delivery channel for delivering gas into the inflation cavity, and

[0048] Spray out through the nozzle.

[0049] Optionally, a dynamic seal that can move up and down is provided in the inflation cavity.

[0050] The dynamic seal is provided with two sets of sealing support end feet respectively contacting with the sealing edge of the stopper;

[0051] The end surface of the dynamic seal away from the sealing cavity is provided with two groups of abutment ends, and the abutment ends extend toward the sealing edge.

[0052] Optionally, when the inflation cavity is in a filled state, the arc-shaped end portion and the sealing contact edge of the support structure protruding outwardly contact the longitudinal end portion and the transverse end portion of the transverse sealing lip respectively to form a contact seal.

[0053] A method for hydraulic testing of pipelines, characterized in that

[0054] S1. Select a section of the pipeline as the test pipeline and install a plugging device at the outlet of the pipeline;

[0055] S1.1. First, install the sealing assembly on the pipeline by tightening the connector;

[0056] S1.2, it is only necessary to extend the sleeve of the plugging device into the pipeline, and then fix the hydraulic cylinder on the pipeline by a fixed connection method (using a tightening fixture, a fastening bolt, etc. to achieve a fixed connection structure);

[0057] S1.3, then start the hydraulic cylinder, drive the release seal end through the sleeve through the extended end of the hydraulic cylinder, and close the hydraulic cylinder;

[0058] S1.4, start the servo motor, drive the lead screw to rotate through the servo motor, and then make the lead screw nut move continuously along the lateral direction of the lead screw. When the preset time is reached, turn off the servo motor, and the arc-shaped sealing surface is unfolded along the longitudinal direction of the pipe 70, so that the arc-shaped sealing surface can be closely attached to or press the inner wall of the pipe;

[0059] S1.5. Connect the gas conveyor to the gas conveying channel, set the value, and then convey gas to the inside of the inflation chamber through the gas conveying channel. When the preset value is reached, close the gas conveyor, and use the air pressure in the inflation chamber to push the dynamic seal toward the sealing chamber until the abutting end is tightly attached to the sealing edge;

[0060] S2. Then arrange the water pressure test system on the experimental pipeline. After the arrangement is completed, remove the air inside the pipeline and then slowly inject water into the pipeline.

[0061] After filling with water, soak it for more than four days to observe whether there is leakage in the experimental pipeline;

[0062] S3. After the soaking is completed, open the valve, start the pressure test pump, and use the graded pressurization method to pressurize and inject water, and monitor the changes in the internal pressure of the pipeline in real time through the pressure gauge;

[0063] The pressure increase amplitude is 0.3 MPa each time. After each increase, the pipeline should maintain pressure for no less than 15 minutes. During the pressure stabilization process, if the pressure needs to be maintained, water can be added to the pipe appropriately.

[0064] S4. When the water pressure in the test pipeline reaches the test pressure and the pre-pressure is stabilized for 30 minutes, stop injecting water to replenish the pressure and enter the pressure stabilization stage, and continue to maintain stability for 15 minutes;

[0065] S5. After stabilizing the pressure for 15 minutes, if the pressure drop in the pipeline does not exceed 0.03MPa, the test pressure can be reduced to the working pressure and maintained at a constant pressure for 30 minutes;

[0066] During the entire test process, whenever there is a pressure drop, water must be added to the pipeline in a timely manner and the amount of water added must be recorded. The amount of water added to the test pipeline during the constant pressure process must also be measured.

[0067] S6. After the pressure stabilization is completed, check it. If there is no water leakage or pressure drop, the water pressure test is qualified. Otherwise, it is unqualified and the water pressure test should be repeated.

[0068] In summary, the beneficial effects of the present invention are:

[0069] (1) The present invention pushes the release seal end to extend out of the sleeve and into the pipe through the extended end of the hydraulic cylinder, and the present embodiment can ensure that when the release seal end extends into the pipe, the servo motor drives the screw to rotate, so that the screw nut continuously moves along the lateral direction of the screw, thereby pushing the arc-shaped sealing surface to expand along the longitudinal direction of the pipe. The arc-shaped sealing surface can be tightly attached to or press the inner wall of the pipe to form a better contact surface, enhance the sealing performance, and thus improve the sealing performance. At the same time, it can maintain a high stability, especially during the high-pressure water pressure test.

[0070] (2) The sealing performance of the present invention is relatively strong. When a water pressure test is required, gas is delivered into the inflation cavity. When the gas pressure reaches a preset value, the gas pressure continuously presses down the support structure, so that the arc-shaped end portion and the sealing contact edge of the support structure protruding outwards contact with the longitudinal end portion and the transverse end portion of the transverse sealing lip, respectively, to form a contact seal; thereby strengthening the contact force between the support structure, the sealing leg and the transverse sealing lip, and ensuring that the sealing performance remains stable during the entire working process;

[0071] After the water pressure test is completed, only the gas inside needs to be pumped out. At this time, the support structure returns to its original position, contacting the restrictions on the external seals. Through the adjustment of air pressure and the flexible movement of dynamic seals, the sealing system can adaptively change under different working conditions, reducing the physical damage or fatigue caused by the seals being in harsh environments such as high pressure and high temperature for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 It is a schematic structural diagram of an embodiment of a plugging device and a method for hydraulic pressure testing of a pipeline according to the present invention, in which the released sealing end is located inside a sleeve and is in a retracted state;

[0073] Figure 2 It is a partial structural schematic diagram of an embodiment of a plugging device and a water pressure test method for a pipeline water pressure test according to the present invention;

[0074] Figure 3 It is an enlarged view of the release seal end structure of an embodiment of a plugging device and a water pressure test method for a pipeline water pressure test according to the present invention;

[0075] Figure 4 It is a schematic structural diagram of an embodiment of a plugging device and a method for hydraulic pressure testing of a pipeline according to the present invention, in which a sealing end is released and extends out of a sleeve to present an expanded state.

[0076] Reference numerals:

[0077] 101, extending end;

[0078] 102, release seal end; 1021, spring; 1022, connector; 1023, arc-shaped sealing surface; 1024, connector; 1025, lead screw; 1026, connecting rod; 1027, lead screw nut; 1029, hydraulic seat;

[0079] 103. Sleeve;

[0080] 104. Hydraulic cylinder;

[0081] 20. Gas delivery channel; 201. Nozzle

[0082] 30, outer seal; 301, static seal ring; 302, sealing abutment edge; 303, support structure; 3031, sealing support foot;

[0083] 40, inner sealing member; 401, stopper; 4011, sealing cavity; 4013, sealing edge; 402, sealing side;

[0084] 403, dynamic seal; 4031, abutment end; 4032, sealing foot; 4033, sealing support end foot;

[0085] 404, transverse sealing lip;

[0086] 50. Fasten the connectors;

[0087] 70. Pipeline;

[0088] 80. Inflatable cavity. DETAILED DESCRIPTION

[0089] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Although exemplary embodiments are disclosed in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to facilitate a thorough understanding of the present invention and to fully convey the concept of the present invention to those skilled in the art.

[0090] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0092] The present invention is mainly used in the field of flexible electronic manufacturing.

[0093] like Figure 1-4 As shown, this embodiment provides a plugging device for pipeline water pressure test, including a sealing assembly, a pipeline 70, and a plugging device for sealing arranged at the outlet end of the pipeline 70, wherein the sealing assembly is fixed by a fastening connector 50, so that the plugging device and the sealing assembly are integrated;

[0094] The fastening connector 50 includes a fixing seat welded to the outer wall of the pipe 70 .

[0095] Furthermore, the blocking device includes a sleeve 103, and the sleeve 103 is installed on the hydraulic cylinder 104 by a fixed connection method such as fastening screws. The sleeve 103 is located inside the pipe 70, and the sleeve 103 also includes a release sealing end 102 located inside, and the release sealing end 102 extends in a transverse direction.

[0096] The sleeve 103 is provided with a protruding end 101 which can push the release sealing end 102 to move in the sleeve 103 and push the release sealing end 102 out of the release port of the sleeve 103 so that the release sealing end enters the interior of the pipe 70;

[0097] When the release seal end 102 leaves the sleeve 103, the release seal end 102 can be expanded in the transverse direction of the pipe, so that the arcuate sealing surface 102 of the release seal end can be closely attached to or pressed against the inner wall of the pipe 70, thereby improving the sealing performance. Figure 3 As shown, the protruding end 101 of the hydraulic cylinder 104 extends into the sleeve 103, and is fixedly connected with a hydraulic seat 1029, a servo motor is arranged on the end face of the hydraulic seat 1029, and the output end of the servo motor is connected to a lead screw 1025 through a bearing assembly, and a lead screw nut 1027 for spiral transmission is arranged on the lead screw 1025, and a detachable connecting rod 1026 is arranged on the lead screw nut 1027, and an arc-shaped sealing surface 1023 is connected to the connecting rod 1026 through a connector 1024, and the other end of the arc-shaped sealing surface 1023 is arranged on a connecting piece 1022, and the connecting piece 1022 is arranged on the end face of the lead screw 1025 away from the hydraulic cylinder.

[0098] Furthermore, the arcuate sealing surface 1023 of the release sealing end 102 is arranged in an arc shape along the lateral extension direction, and the arcuate sealing surface 1023 is made of elastic materials such as rubber; so that after the release sealing end 102 enters the pipe 70, the two ends of the arcuate sealing surface 1023 can easily have a certain elastic margin, so that it can be bent, and then it is easy to fit with the inner wall of the pipe, thereby improving the sealing performance.

[0099] Since most of the existing pipe end sealing devices adopt flange sealing, seals are usually installed between the flanges to ensure that there is no water leakage during the test. However, in actual application, the flange seal may become loose, thereby affecting the sealing effect. In this embodiment, the extended end of the hydraulic cylinder 104 pushes the release seal end 102 to extend out of the sleeve 103 and enter the pipe 70, and this implementation can ensure that when the release seal end extends into the pipe 70, the servo motor drives the lead screw 1025 to rotate, so that the lead screw nut 1027 moves continuously along the lateral direction of the lead screw, and then pushes the arc-shaped sealing surface to expand along the longitudinal direction of the pipe 70, and the arc-shaped sealing surface 102 can be close to or press the inner wall of the pipe 70 to form a better contact surface, enhance the sealing performance, and then improve the sealing performance, especially during the high-pressure water pressure test, it can maintain a high stability.

[0100] See also Figure 1 and Figure 2 As shown, the sealing assembly includes an outer sealing member 30 and an inner sealing member 40 arranged radially, the two are integrated, and the inner sealing member 40 includes a stopper 401 and a transverse sealing lip 404 .

[0101] Furthermore, the stopper 401 extends continuously in the longitudinal direction and is bent twice to form a sealing edge 402 . The sealing edge 402 extends continuously in the longitudinal direction and toward the transverse sealing lip 404 , and contacts the end face of the static sealing ring 301 to form a contact seal.

[0102] Furthermore, the outer seal 30 includes a static sealing ring 301, and the static sealing ring 301 is provided with a support structure 303 integrally arranged therewith, and the outer seal 30 is made of elastic materials such as rubber; the support structure 303 continuously extends along the direction v, and is provided with two groups of sealing feet 3031 extending in opposite directions, and the two groups of sealing feet 3031 respectively contact the inclined end of the sealing edge 402 and the longitudinal end of the transverse sealing lip 404 to form a contact seal.

[0103] Furthermore, an arc-shaped end portion protruding outward is provided on the end face of the sealing support foot 3031 close to the transverse sealing lip 404, and at least one group of sealing contact edges 302 is provided on the transverse end face close to the transverse sealing lip 404. A sealing isolation channel is formed by the sealing edge 402, the supporting structure 303 and the transverse sealing lip 404, thereby effectively improving the sealing performance.

[0104] Furthermore, the stopper 401, the static sealing ring 301 and the supporting structure 303 enclose an air filling cavity 80, and the outer sealing member 30 is provided with a gas delivery channel 20 for delivering gas into the air filling cavity 80, and the gas is ejected through the nozzle 201;

[0105] The inlet end of the gas delivery channel 20 is used to connect to an external gas delivery device.

[0106] Furthermore, a dynamic seal 403 that can move up and down is disposed in the inflation cavity 80. In order to ensure that the dynamic seal 403 always moves toward the sealing cavity 4011, the dynamic seal 430 is provided with two sets of sealing support end feet 4033 that respectively contact with the sealing edge 4023 of the stopper 401.

[0107] The end face of the dynamic seal 403 away from the sealing cavity 4011 is provided with two sets of abutment ends 4031, and the abutment ends 4031 extend toward the sealing edge 4013. When the air pressure in the inflation cavity 80 reaches a certain level, the abutment ends 4031 are tightly attached to the sealing edge 4013, and the dynamic seal stops moving.

[0108] In this embodiment, gas is delivered to the inflation chamber 80 through the gas delivery channel 20, and the air pressure in the inflation chamber is then used to push the dynamic seal 403 toward the sealing chamber 4011 until the abutment end 4031 is tightly attached to the sealing edge 4013, at which time the dynamic seal stops moving.

[0109] The sealing performance of the present invention is relatively strong. When a water pressure test is required, gas is delivered into the inflation cavity 80. When the gas pressure reaches a preset value, the gas pressure continuously presses down the support structure 303, so that the arc-shaped end of the support structure 303 protruding outward and the sealing contact edge 302 respectively contact the longitudinal end and the transverse end of the transverse sealing lip 404, forming a contact seal; thereby strengthening the contact force between the support structure 303, the sealing leg 3031 and the transverse sealing lip 404, ensuring that the sealing performance remains stable during the entire working process;

[0110] After the water pressure test is completed, it is only necessary to pump out the gas inside. At this time, the support structure 303 returns to its original position, and the contact with the external seal is restricted. Through the adjustment of air pressure and the flexible movement of dynamic seals, the sealing system can adaptively change under different working conditions, reducing the physical damage or fatigue caused by the seals being in harsh environments such as high pressure and high temperature for a long time.

[0111] Methods used for hydrostatic testing of pipelines:

[0112] S1. Select a section of the delivery pipeline as a test pipeline and install a plugging device at the outlet of the pipeline 70;

[0113] S1.1. First, install the sealing assembly on the pipeline by tightening the connector 50;

[0114] S1.2, it is only necessary to extend the sleeve of the plugging device into the pipeline, and then fix the hydraulic cylinder on the pipeline by a fixed connection method (using a tightening fixture, a fastening bolt, etc. to achieve a fixed connection structure);

[0115] S1.3, then start the hydraulic cylinder 104, drive the release seal end 102 through the sleeve 103 through the extended end of the hydraulic cylinder 104, and close the hydraulic cylinder 104;

[0116] S1.4, start the servo motor, drive the lead screw to rotate through the servo motor, and then make the lead screw nut 1027 move continuously along the lateral direction of the lead screw. When the preset time is reached, turn off the servo motor, and the arc-shaped sealing surface is expanded along the longitudinal direction of the pipe 70, so that the arc-shaped sealing surface 102 can be closely attached to or press the inner wall of the pipe 70;

[0117] S1.5. Connect the gas conveyor to the gas conveying channel, set the value, and then convey gas to the inside of the inflation chamber through the gas conveying channel. When the preset value is reached, close the gas conveyor, and use the air pressure in the inflation chamber to push the dynamic seal 403 toward the sealing chamber 4011 until the abutting end 4031 is tightly attached to the sealing edge 4013.

[0118] S2. Then arrange the water pressure test system on the experimental pipeline. After the arrangement is completed, remove the air inside the pipeline and then slowly inject water into the pipeline.

[0119] After filling with water, soak it for more than four days to observe whether there is leakage in the experimental pipeline;

[0120] S3. After the soaking is completed, open the valve, start the pressure test pump, and use the graded pressurization method to pressurize and inject water, and monitor the changes in the internal pressure of the pipeline in real time through the pressure gauge;

[0121] The pressure increase amplitude is 0.3 MPa each time. After each increase, the pipeline should maintain pressure for no less than 15 minutes. During the pressure stabilization process, if the pressure needs to be maintained, water can be added to the pipe appropriately.

[0122] S4. When the water pressure in the test pipeline reaches the test pressure and the pre-pressure is stabilized for 30 minutes, stop injecting water to replenish the pressure and enter the pressure stabilization stage, and continue to maintain stability for 15 minutes;

[0123] S5. After stabilizing the pressure for 15 minutes, if the pressure drop in the pipeline does not exceed 0.03MPa, the test pressure can be reduced to the working pressure and maintained at a constant pressure for 30 minutes;

[0124] During the entire test process, whenever there is a pressure drop, water must be added to the pipeline in a timely manner and the amount of water added must be recorded. The amount of water added to the test pipeline during the constant pressure process must also be measured.

[0125] S6. After the pressure stabilization is completed, check it. If there is no water leakage or pressure drop, the water pressure test is qualified. Otherwise, it is unqualified and the water pressure test should be repeated.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A plugging device for pipeline water pressure test, characterized in that: include: pipeline; A plugging device that seals the pipe during the hydrostatic test method, and is arranged at the outlet end of the pipeline; Sealing components, and The sealing assembly is fixed by a fastening connector, and The blocking device and the sealing assembly are integrated; The blocking device comprises a sleeve, and The sleeve is mounted on the hydraulic cylinder, and The sleeve is located inside the pipe, and The sleeve also includes a release seal end located inside, The release seal end portion extends in a transverse direction; The hydraulic cylinder also includes an extended end portion, and The release seal end is pushed to move in the sleeve by the extended end, and The release seal end is pushed out of the release port of the sleeve so that The release seal end enters the interior of the pipe.

2. The plugging device for pipeline water pressure test according to claim 1, characterized in that: The extended end of the hydraulic cylinder extends into the sleeve, and By installing a hydraulic seat, A servo motor is arranged on the end surface of the hydraulic seat, and The output end of the servo motor is connected to the lead screw through a bearing assembly, and The lead screw is provided with a lead screw nut for spiral transmission therewith, and The screw nut is provided with a connecting rod for disassembly connection. The connecting rod is connected to the arc-shaped sealing surface through a connector, and The other end of the arc-shaped sealing surface is mounted on the connecting piece, and The connecting member is installed on the end surface of the screw far away from the hydraulic cylinder; The arc-shaped sealing surface of the release seal end is arranged in an arc shape along the lateral extension direction, and The arc-shaped sealing surface is made of elastic materials such as rubber.

3. The plugging device for pipeline water pressure test according to claim 1, characterized in that: The sealing assembly comprises an outer sealing member and an inner sealing member arranged radially, and the two are arranged in an integrated manner. The outer seal also includes a static sealing ring, The inner seal comprises a stopper and a transverse sealing lip, The blocking member extends continuously in the longitudinal direction, and After two bends, a sealing edge is formed, and the sealing edge is longitudinally and extends continuously in the direction of the transverse sealing lip, and It contacts the end face of the static sealing ring to form a contact seal.

4. The plugging device for pipeline water pressure test according to claim 3, characterized in that: The static sealing ring is provided with a support structure integrally provided therewith. The outer sealing member is made of elastic materials such as rubber; The support structure extends continuously along direction v, and Two sets of sealing legs extending in opposite directions are provided, and The two groups of sealing legs respectively contact the inclined ends of the sealing edge and the longitudinal ends of the transverse sealing lip to form a contact seal. An arc-shaped end portion protruding outward is arranged on the end surface of the sealing leg close to the transverse sealing lip, and at least one group of sealing contact edges is arranged on the transverse end surface close to the transverse sealing lip. A sealed isolation channel is formed by the sealing edge, the supporting structure and the transverse sealing lip.

5. The plugging device for pipeline water pressure test according to claim 4, characterized in that , The stopper, the static sealing ring and the supporting structure enclose a gas-filled cavity, and The outer sealing member is provided with a gas delivery channel for delivering gas into the inflation cavity, and Spray out through the nozzle.

6. The plugging device for pipeline water pressure test according to claim 5, characterized in that: A dynamic seal that can move up and down is arranged in the inflation cavity. The dynamic seal is provided with two sets of sealing support end feet respectively contacting with the sealing edge of the stopper; The end surface of the dynamic seal away from the sealing cavity is provided with two groups of abutment ends, and the abutment ends extend toward the sealing edge.

7. The plugging device for pipeline water pressure test according to claim 5, characterized in that When the inflation cavity is in a filled state, the arc-shaped end portion and the sealing contact edge of the support structure protruding outwards contact the longitudinal end portion and the transverse end portion of the transverse sealing lip respectively, forming a contact seal.

8. A method for hydraulic testing of a pipeline, characterized in that: S1. Select a section of the pipeline as the test pipeline and install a plugging device at the outlet of the pipeline; S1.

1. First, install the sealing assembly on the pipeline by tightening the connector; S1.2, it is only necessary to extend the sleeve of the plugging device into the pipeline, and then fix the hydraulic cylinder on the pipeline by means of fixed connection; S1.3, then start the hydraulic cylinder, drive the release sealing end through the sleeve through the extended end of the hydraulic cylinder, and close the hydraulic cylinder; S1.4, start the servo motor, drive the lead screw to rotate through the servo motor, and then make the lead screw nut move continuously along the lateral direction of the lead screw. When the preset time is reached, turn off the servo motor, and the arc-shaped sealing surface is unfolded along the longitudinal direction of the pipeline, so that the arc-shaped sealing surface is closely attached to or presses the inner wall of the pipeline; S1.

5. Connect the gas conveyor to the gas conveying channel, set the value, and then convey gas to the inside of the inflation chamber through the gas conveying channel. When the preset value is reached, close the gas conveyor, and use the air pressure in the inflation chamber to push the dynamic seal toward the sealing chamber until the abutting end is tightly attached to the sealing edge; S2. Then arrange the water pressure test system on the experimental pipeline. After the arrangement is completed, remove the air inside the pipeline and then slowly inject water into the pipeline. After filling with water, soak it for more than four days to observe whether there is leakage in the experimental pipeline; S3. After the soaking is completed, open the valve, start the pressure test pump, and use the graded pressurization method to pressurize and inject water, and monitor the changes in the internal pressure of the pipeline in real time through the pressure gauge; The pressure increase amplitude is 0.3 MPa each time. After each increase, the pipeline should maintain pressure for no less than 15 minutes. During the pressure stabilization process, if the pressure needs to be maintained, water can be added to the pipe appropriately. S4. When the water pressure in the test pipeline reaches the test pressure and the pre-pressure is stabilized for 30 minutes, stop injecting water to replenish the pressure and enter the pressure stabilization stage, and continue to maintain stability for 15 minutes; S5. After stabilizing the pressure for 15 minutes, if the pressure drop in the pipeline does not exceed 0.03MPa, the test pressure can be reduced to the working pressure and maintained at a constant pressure for 30 minutes; During the entire test process, whenever there is a pressure drop, water must be added to the pipeline in a timely manner and the amount of water added must be recorded. The amount of water added to the test pipeline during the constant pressure process must also be measured. S6. After the pressure stabilization is completed, check it. If there is no water leakage or pressure drop, the water pressure test is qualified. Otherwise, it is unqualified and the water pressure test should be repeated.

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