High-pressure pipeline pressing test device

Abstract

The utility model provides a high-pressure pipeline pressing test device which comprises a hydraulic pump set, a bidirectional driving cylinder, a unidirectional hydraulic cylinder and a liquid injection mechanism. The hydraulic pump set is connected with the bidirectional driving cylinder; the two-way driving cylinder is provided with a first piston rod, the one-way hydraulic cylinder is provided with a second piston rod and a sealing cylinder, and the first piston rod is connected with the second piston rod; the liquid injection mechanism comprises a liquid storage tank, a liquid inlet pipe, a liquid outlet pipe, a liquid supplementing pipe and a liquid return pipe; the liquid inlet pipe and the liquid outlet pipe are respectively connected with the sealing cylinder; and the liquid supplementing pipe and the liquid returning pipe are respectively connected with the liquid outlet pipe through a tee joint. Through cooperation of the hydraulic pump set, the two-way driving cylinder and the one-way hydraulic cylinder, high pressure can be provided to meet the pressing requirement for a high-pressure pipeline, the structure is simple, manufacturing is easy, and cost is low; the pressure increasing process of the to-be-measured pipeline is continuous, stable and efficient; the whole device is stable in operation, has good wear resistance and is not easy to break down; components are easy to maintain or replace, and the service life of the device is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial pipelines, in particular to a high-pressure pipeline pressure testing device. Background Art

[0002] Industrial pipelines are mainly used to transport various types of liquids. After the pipeline is installed, a pressure test is required to detect the tightness of the pipeline connection. The pressure test device currently used consists of a high-pressure plunger pump and its matching pressure gauge. During the pressure test, one end of the pressure test pipeline is connected to the pressure gauge, and the other end is connected to the plunger pump. The high-pressure plunger pump pumps liquid into the tested pipeline. Since the water pumped out by the high-pressure plunger pump is in streams, the pressure gauge of the pipeline jumps frequently during the liquid injection process, which makes it difficult to meet the pressure test requirements of the high-pressure pipeline; at the same time, the high-pressure plunger pump is expensive and needs to be purchased specifically for pressure testing, which is not conducive to saving engineering costs; at the same time, the high-pressure plunger pump is prone to wear or failure under continuous use, and the entire device needs to be disassembled for maintenance, which is cumbersome and also causes delays in the construction period. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a high-pressure pipeline pressure test device, which can measure the pipeline pressure increase process continuously, stably and efficiently, has a simple structure and is easy to manufacture.

[0004] The technical solution adopted by the utility model is: a high-pressure pipeline pressure test device, including a hydraulic pump group, a two-way driving cylinder, a one-way hydraulic cylinder and a liquid injection mechanism;

[0005] The hydraulic pump group is connected to the bidirectional drive cylinder and is used to drive the piston of the bidirectional drive cylinder to reciprocate;

[0006] The bidirectional drive cylinder has a first piston rod, the one-way hydraulic cylinder has a second piston rod and a sealing cylinder, and the first piston rod is connected to the second piston rod;

[0007] The liquid injection mechanism comprises a liquid inlet pipe and a liquid outlet pipe, wherein the liquid inlet pipe and the liquid outlet pipe are respectively connected to the sealing cylinder; the liquid outlet pipe is used for injecting liquid into the pipeline to be tested to form high pressure.

[0008] Furthermore, two oil inlet pipes are provided between the hydraulic pump group and the bidirectional drive cylinder.

[0009] Furthermore, the liquid injection mechanism also includes a liquid storage tank, and the input end of the liquid inlet pipe is connected to the liquid storage tank.

[0010] Furthermore, the liquid injection mechanism also includes a liquid infusion tube connected to the liquid storage tank, and is provided with a liquid infusion pump for injecting liquid into the pipeline to be tested to form a low pressure.

[0011] Furthermore, the liquid injection mechanism also includes a liquid return pipe connected to the liquid storage tank, which is used to discharge the liquid in the pipeline to be tested into the liquid storage tank.

[0012] Furthermore, the liquid inlet pipe and the liquid outlet pipe are both provided with a one-way valve and a ball valve; the liquid replenishment pipe and the liquid return pipe are provided with the ball valve.

[0013] Furthermore, the output end of the liquid infusion tube is connected to the liquid outlet tube through a tee.

[0014] Furthermore, the input end of the liquid return pipe is connected to the liquid outlet pipe through a tee.

[0015] Furthermore, it also includes a base for fixing the hydraulic pump group, the bidirectional drive cylinder and the unidirectional hydraulic cylinder.

[0016] A high-pressure pipeline pressure test method, using the above-mentioned high-pressure pipeline pressure test device, comprises the following steps:

[0017] Fill the reservoir with liquid;

[0018] Close the ball valves of the liquid inlet pipe and the liquid return pipe;

[0019] Open the ball valve of the liquid infusion pipe, start the liquid infusion pump, inject liquid into the pipeline to be tested, and then close the ball valve of the liquid infusion pipe;

[0020] Open the ball valves of the liquid inlet pipe and the liquid outlet pipe, start the hydraulic pump group, so that the first piston rod of the two-way drive cylinder drives the second piston rod of the one-way hydraulic cylinder to reciprocate, and inject liquid into the pipeline to be tested;

[0021] Close the ball valve of the liquid outlet pipe and stop the operation of the hydraulic pump group;

[0022] Monitoring the pressure of the pipeline to be tested;

[0023] Open the ball valve of the liquid return pipe.

[0024] The advantages and positive effects of the utility model are:

[0025] 1. Through the cooperation of the hydraulic pump group, the two-way drive cylinder and the one-way hydraulic cylinder, a higher pressure can be provided to meet the pressure demand of the high-pressure pipeline. The structure is simple and easy to make. Compared with the purchase of a high-pressure plunger pump, the cost is low and it has strong applicability.

[0026] 2. The pipeline to be tested is injected with low-pressure liquid through the liquid replenishing pipeline, and the pipeline to be tested is continuously injected with liquid through the one-way hydraulic cylinder to form high pressure, so that the pressure increase process of the pipeline to be tested is continuous, stable and efficient, meeting the requirements of the pressure test.

[0027] 3. The overall device runs smoothly, has good anti-wear performance, and is not prone to failure; even if wear or failure occurs, it does not need to be dismantled or disassembled as a whole, and is easy to repair or replace components, extending the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the principle of a specific embodiment of the utility model;

[0029] Figure 2 It is a structural schematic diagram of a specific embodiment of the utility model.

[0030] In the figure:

[0031] 1. Hydraulic pump group 101, oil inlet pipe 2, bidirectional drive cylinder

[0032] 201, first piston rod 3, one-way hydraulic cylinder 301, second piston rod

[0033] 4. Liquid injection mechanism 401, liquid inlet pipe 402, liquid outlet pipe

[0034] 403, liquid storage tank 404, liquid replenishment tube 405, liquid return tube

[0035] 406, one-way valve 407, ball valve 5, pipeline to be tested

[0036] 6. Base DETAILED DESCRIPTION

[0037] The embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0038] like Figure 1-Figure 2 As shown, the utility model proposes a high-pressure pipeline pressure test device, including a hydraulic pump group 1, a two-way drive cylinder 2, a one-way hydraulic cylinder 3 and an injection mechanism 4; the hydraulic pump group 1 is connected to the two-way drive cylinder 2, and is used to drive the piston of the two-way drive cylinder 2 to reciprocate; the two-way drive cylinder 2 has a first piston rod 201, the one-way hydraulic cylinder 3 has a second piston rod 301 and a sealing cylinder, and the first piston rod 201 is connected to the second piston rod 301; the injection mechanism 4 includes a liquid inlet pipe 401 and a liquid outlet pipe 402, and the liquid inlet pipe 401 and the liquid outlet pipe 402 are respectively connected to the sealing cylinder; the liquid inlet pipe 401 is used to inject liquid into the sealing cylinder, and the liquid outlet pipe 402 is used to inject the liquid in the sealing cylinder into the pipeline 5 to be tested to form high pressure.

[0039] In this embodiment, the hydraulic pump group 1 is a finished device composed of a hydraulic gear pump, an oil tank, a relief valve, a Y-type electromagnetic reversing valve, a filter, etc.; two oil inlet pipes 101 are arranged between the hydraulic pump group 1 and the two-way drive cylinder 2, the two-way drive cylinder 2 has a piston and two sealing cylinders separated by the piston, the two oil inlet pipes 101 are respectively connected to the two sealing cylinders, the hydraulic pump group 1 controls the oil inlet pipes 101 to inject liquid into the sealing cylinder to realize the reciprocating motion of the piston, the relief valve can adjust the flow rate of the liquid in the two oil inlet pipes 101 to provide sufficient pressure to the piston to meet the pressure test requirements; the Y-type electromagnetic reversing valve automatically controls the pulses generated by the piston when it reciprocates to ensure smooth operation of the pressure test process; the hydraulic pump group 1 is a common device in the prior art, and its specific structure is not described here.

[0040] In this embodiment, the hydraulic pump group 1 drives the piston of the two-way drive cylinder 2 to reciprocate, and the first piston rod 201 of the two-way drive cylinder 2 is connected to the second piston rod 301 of the one-way hydraulic cylinder 3, thereby driving the piston of the one-way hydraulic cylinder 3 to reciprocate, so as to control the sealing cylinder of the one-way hydraulic cylinder 3 to suck in or discharge liquid; specifically, when the second piston rod 301 extends out of the one-way hydraulic cylinder 3, the piston moves to one side of the one-way hydraulic cylinder 3, so that the volume of the sealing cylinder increases, and liquid is sucked in through the liquid inlet pipe 401; when the second piston rod 301 retracts into the one-way hydraulic cylinder 3, the piston moves to the one-way hydraulic cylinder 3, so that the volume of the sealing cylinder increases, and liquid is sucked in through the liquid inlet pipe 401; The other side of the pressure cylinder 3 moves to reduce the volume of the sealing cylinder, and the liquid is discharged through the liquid outlet pipe 402. The output end of the liquid outlet pipe 402 is connected to the pipeline to be tested 5, so that the liquid is injected into the pipeline to be tested 5; the second piston rod 301 of the one-way hydraulic cylinder 3 continuously reciprocates, and finally the liquid is continuously injected into the pipeline to be tested 5, so that the pressure in the pipeline to be tested 5 is steadily increased until the set high pressure requirement is met; the setting of the hydraulic pump group 1 can provide sufficient power for the one-way hydraulic cylinder 3 to ensure that the piston can resist the high pressure in the pipeline to be tested 5, so as to continuously inject liquid into the pipeline to be tested 5.

[0041] Furthermore, the liquid injection mechanism 4 also includes a liquid storage tank 403, and the input end of the liquid inlet pipe 401 is connected to the liquid storage tank 403, and the liquid flows from the liquid inlet pipe 401 into the sealing cylinder of the one-way hydraulic cylinder 3 to provide sufficient pressurizing liquid; in a specific embodiment, the liquid storage tank 403 is arranged above the one-way hydraulic cylinder 3 so that the liquid inlet pipe 401 is connected to the one-way hydraulic cylinder 3, and the liquid enters the sealing cylinder under the action of gravity and the suction force of the sealing cylinder.

[0042] Furthermore, the liquid injection mechanism 4 also includes a liquid infusion pipe 404 connected to the liquid storage tank 403, and is provided with a liquid infusion pump, which is used to inject liquid into the pipeline 5 to be tested to form a low pressure. At the beginning of the test, there is no liquid inside the pipeline 5 to be tested. Liquid is injected into the pipeline 5 to be tested through the liquid infusion pipe 404, so that the pipeline 5 to be tested is quickly in a low-pressure state; then, liquid is continuously injected into the pipeline 5 to be tested through the cooperation of the one-way hydraulic cylinder 3 and the liquid inlet pipe 401 and the liquid outlet pipe 402, and the pressure in the pipeline 5 to be tested is gradually increased. On the one hand, this design improves the liquid injection efficiency of the pipeline 5 to be tested, and on the other hand, by dividing the entire liquid injection process into a low-pressure liquid injection stage and a high-pressure liquid injection stage, the workload of the hydraulic pump group 1, the two-way drive cylinder 2 and the one-way hydraulic cylinder 3 is reduced, the wear of the components is avoided, and the service life of the device is extended.

[0043] Furthermore, the liquid injection mechanism 4 also includes a return pipe 405 connected to the liquid storage tank 403, and the input end of the return pipe 405 is connected to the pipeline to be tested 5. When the pressure test is completed, the liquid in the pipeline to be tested 5 is discharged into the liquid storage tank 403 through the return pipe 405, thereby realizing the recycling of the liquid, avoiding liquid pollution, and achieving energy saving and environmental protection.

[0044] Furthermore, the liquid inlet pipe 401 and the liquid outlet pipe 402 are both provided with a one-way valve 406 and a ball valve 407, and the liquid replenishment pipe 404 and the liquid return pipe 405 are provided with a ball valve 407 to control the flow direction of the liquid and cooperate with the reciprocating motion of the second piston rod 301; the one-way valve 406 is also called a check valve, which is a directional control valve that allows the liquid to flow in only one direction but not in the opposite direction. Specifically, in the low-pressure liquid injection stage, the ball valve 407 of the liquid inlet pipe 404 is opened, and the ball valves 407 of the liquid inlet pipe 401, the liquid outlet pipe 402 and the liquid return pipe 405 are all closed; in the high-pressure liquid injection stage, the ball valves 407 of the liquid inlet pipe 404 and the liquid return pipe 405 are all closed, and the ball valves 407 of the liquid inlet pipe 401 and the liquid outlet pipe 402 are all opened, and the one-way valve 406 of the liquid inlet pipe 401 automatically opens in one direction under the suction of the sealing cylinder, so that the liquid flows from the liquid inlet pipe 401 to the sealing cylinder, and at the same time, the one-way valve 406 of the liquid outlet pipe 402 is automatically closed to Prevent the liquid in the tested pipeline 5 from flowing into the sealing cylinder; with the movement of the second piston rod 301, the one-way valve 406 of the liquid outlet pipe 402 is automatically opened in one direction under the action of the liquid pressure in the sealing cylinder, so that the liquid flows from the liquid outlet pipe 402 to the tested pipeline 5, and at the same time, the one-way valve 406 of the liquid inlet pipe 401 is automatically closed to prevent the liquid in the sealing cylinder from flowing into the liquid storage tank 403; after the pressure test is completed, the ball valves 407 of the liquid inlet pipe 401, the liquid outlet pipe 402 and the liquid replenishing pipe 404 are all closed, and the liquid flows from the liquid return pipe 405 to the liquid storage tank 403.

[0045] In a specific embodiment, the output end of the infusion tube 404 is connected to the liquid outlet tube 402 through a tee. Specifically, the output end of the infusion tube 404 is connected between the one-way valve 406 of the liquid outlet tube 402 and the output end to form a first connection point. The infusion tube 404 and the liquid outlet tube 402 share a section of pipeline connected to the pipeline to be tested 5 to reduce the interfaces of the pipeline to be tested 5, facilitate the connection between pipelines, and avoid the risk of interface failure during the pressure test.

[0046] Furthermore, the input end of the return pipe 405 is connected to the liquid outlet pipe 402 through a tee, and the connection part between the return pipe 405 and the liquid outlet pipe 402 is a second connection point, which is located between the first connection point and the output end of the liquid outlet pipe 402; the ball valve 407 of the liquid outlet pipe 402 is arranged between the second connection point and the output end of the liquid outlet pipe 402, and is closed after the pressure in the pipeline 5 to be tested reaches a set value, so as to ensure the accuracy and safety of the pressure test; through this design, the return pipe 405, the liquid replenishment pipe 404 and the liquid outlet pipe 402 share a section of the pipeline with the pipeline 5 to be tested, and only one interface is retained, which further improves the convenience of pipeline connection and the safety of the pressure test.

[0047] In a specific embodiment, the device also includes a base 6 for fixing the hydraulic pump group 1, the two-way drive cylinder 2 and the one-way hydraulic cylinder 3; the hydraulic pump group 1, the two-way drive cylinder 2 and the one-way hydraulic cylinder 3 are connected in sequence and are detachably arranged on the base 6 through a special fixing device. The liquid storage tank 403 of the injection mechanism 4 is also fixed to the base 6 and is arranged above the one-way hydraulic cylinder 3. The liquid inlet pipe 401 is connected between the liquid storage tank 403 and the one-way hydraulic cylinder 3, the liquid outlet pipe 402 is connected between the one-way hydraulic cylinder 3 and the pipeline 5 to be tested, and both ends of the liquid replenishment pipe 404 and the liquid return pipe 405 are respectively connected to the liquid storage tank 403 and the liquid outlet pipe 402.

[0048] In a specific embodiment, the base 6 is made of steel sections and steel plates, and has an installation area and corresponding fixing devices that match the fixed hydraulic pump group 1, the two-way drive cylinder 2, the one-way hydraulic cylinder 3, and the liquid storage tank 403, connecting the above components as a whole, making the device easier to move and install; in addition, when a component fails or wears out, it can be easily repaired and replaced, thereby improving the convenience of use.

[0049] In a specific embodiment, the liquid storage tank 403 has a liquid filling port and a filtering device, so that the liquid injected into the liquid storage tank 403 meets the requirements of the pressure test.

[0050] A testing method using a high-pressure pipeline pressure test device proposed by the utility model comprises the following steps:

[0051] Inject liquid into the liquid storage tank 403; the capacity of the liquid storage tank 403 should match the capacity of the pipeline 5 to be tested, and should not be too large to avoid affecting the movement of the device; in some specific embodiments, the capacity of the liquid storage tank 403 is small, and it is necessary to repeatedly inject liquid into the liquid storage tank 403;

[0052] Close the ball valve 407 of the liquid inlet pipe 401 and the liquid return pipe 405;

[0053] Open the ball valve 407 of the liquid infusion tube 404, start the liquid infusion pump, and inject liquid into the pipeline 5 to be tested. After the pipeline 5 to be tested is filled with liquid, close the liquid infusion tube 404;

[0054] Open the ball valves 407 of the liquid inlet pipe 401 and the liquid outlet pipe 402, start the hydraulic pump group 1, and make the first piston rod 201 of the two-way drive cylinder 2 drive the second piston rod 301 of the one-way hydraulic cylinder 3 to reciprocate. The liquid flows from the liquid storage tank 403 to the one-way hydraulic cylinder 3, and then is injected into the pipeline 5 to be tested by the one-way hydraulic cylinder 3 until the pressure in the pipeline 5 to be tested reaches the set value. Then close the ball valve 407 of the liquid outlet pipe 402 and stop the operation of the hydraulic pump group 1.

[0055] Monitor the pressure of the pipeline 5 to be tested; usually, the pipeline 5 to be tested needs to be kept at a high pressure for a period of time to determine the connection status of the pipeline 5 to be tested;

[0056] After the test is finished, the ball valve 407 of the liquid return pipe 405 is opened to allow the liquid in the pipeline 5 to be tested to flow back into the liquid storage tank 403 for the pressure test of the next pipeline 5 to be tested.

[0057] The advantages and positive effects of the utility model are:

[0058] 1. Through the cooperation of the hydraulic pump group, the two-way drive cylinder and the one-way hydraulic cylinder, a higher pressure can be provided to meet the pressure demand of the high-pressure pipeline. The structure is simple and easy to make. Compared with the purchase of a high-pressure plunger pump, the cost is low and it has strong applicability.

[0059] 2. The pipeline to be tested is injected with low-pressure liquid through the liquid replenishing pipeline, and the pipeline to be tested is continuously injected with liquid through the one-way hydraulic cylinder to form high pressure, so that the pressure increase process of the pipeline to be tested is continuous, stable and efficient, meeting the requirements of the pressure test.

[0060] 3. The overall device runs smoothly, has good anti-wear performance, and is not prone to failure; even if wear or failure occurs, it does not need to be dismantled or disassembled as a whole, and is easy to repair or replace components, extending the service life of the device.

[0061] The above is a detailed description of the embodiments of the utility model, but the contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A high-pressure pipeline pressure test device, characterized in that: It includes a hydraulic pump group, a bidirectional driving cylinder, a unidirectional hydraulic cylinder and a liquid injection mechanism; The hydraulic pump group is connected to the bidirectional drive cylinder and is used to drive the piston of the bidirectional drive cylinder to reciprocate; The bidirectional drive cylinder has a first piston rod, the one-way hydraulic cylinder has a second piston rod and a sealing cylinder, and the first piston rod is connected to the second piston rod; The liquid injection mechanism comprises a liquid inlet pipe and a liquid outlet pipe, wherein the liquid inlet pipe and the liquid outlet pipe are respectively connected to the sealing cylinder; the liquid outlet pipe is used for injecting liquid into the pipeline to be tested to form high pressure.

2. The high-pressure pipeline pressure test device according to claim 1 is characterized in that: Two oil inlet pipes are arranged between the hydraulic pump group and the bidirectional driving cylinder.

3. The high-pressure pipeline pressure test device according to claim 1 is characterized in that: The liquid injection mechanism also includes a liquid storage box, and the input end of the liquid inlet pipe is connected to the liquid storage box.

4. The high-pressure pipeline pressure test device according to claim 3 is characterized in that: The liquid injection mechanism also includes a liquid infusion tube connected to the liquid storage tank, and is provided with a liquid infusion pump for injecting liquid into the pipeline to be tested to form a low pressure.

5. The high-pressure pipeline pressure test device according to claim 4 is characterized in that: The liquid injection mechanism also includes a liquid return pipe connected to the liquid storage tank, which is used to discharge the liquid in the pipeline to be tested into the liquid storage tank.

6. The high-pressure pipeline pressure test device according to claim 5, characterized in that: The liquid inlet pipe and the liquid outlet pipe are both provided with a one-way valve and a ball valve; the liquid replenishment pipe and the liquid return pipe are provided with the ball valve.

7. The high-pressure pipeline pressure test device according to claim 5 or 6, characterized in that: The output end of the liquid infusion tube is connected to the liquid outlet tube through a tee.

8. The high-pressure pipeline pressure test device according to claim 7, characterized in that: The input end of the liquid return pipe is connected to the liquid outlet pipe through a tee.

9. The high-pressure pipeline pressure test device according to claim 8, characterized in that: It also includes a base for fixing the hydraulic pump group, the bidirectional drive cylinder and the unidirectional hydraulic cylinder.

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