A new pressure testing and plugging device for plastic pipes

Abstract

The present invention discloses a novel pressure test and plugging device for plastic pipes, comprising a positioning frame, wherein an intermediate sealing section is installed in the middle and upper part of the positioning frame, a movable left plug and a movable right plug are respectively provided at the left and right ends of the hard plastic pipe, a retaining ring is provided on the outside of the rubber sealing ring, a guide rail is provided on the upper right part of the positioning frame, a pressure measuring port is provided on the outer middle part of the movable right plug, a stop valve is provided on the upper surface of the movable right plug, and a pressure port is provided on the upper left part of the movable left plug. The novel pressure test and plugging device for plastic pipes has no direct contact with the hard plastic pipe because the movable left plug and the movable right plug do not directly contact the hard plastic pipe. Instead, the hard plastic pipe is placed inside the intermediate sealing section, and the sealing effect is achieved by the movable left plug, the movable right plug, the rubber sealing ring and the retaining ring, thereby eliminating the centering process of the traditional sealing structure and the axial force applied to the pipe during the test process.

Description

Technical Field

[0001] The invention relates to the technical field of pressure test and plugging devices, in particular to a novel pressure test and plugging device for plastic pipes. Background Art

[0002] Currently, the pipe end sealing method used for hydrostatic testing of plastic pipes both domestically and internationally is the outer diameter sealing method using O-rings or sealing strips. This pre-loaded sealing method, due to the heavy weight of stainless steel or aluminum alloy sealing fixtures for large-diameter plastic pipes, often leads to drawbacks such as excessive pipe installation labor, loose seals, water leakage, difficulty applying pressure, and difficulty aligning the pipe during installation. To prevent damage to the seals, the pipe spigot must be chamfered before installation. The elasticity of the sealing rubber ring and the pre-load clearance significantly affect the pipe seal. High requirements are placed on the rigidity and radial dimensions of the plastic pipe. The sample pipe must be pre-conditioned before the test to bring it to the test temperature before connecting it to the pressure device. This process results in a temperature drop that can affect the test results. Traditional clamps are installed directly on the pipe end. As the pressure increases during the test, the axial force on the pipe increases, which does not meet the requirements of GB / T15560-1995, "Hydraulic Instantaneous Burst and Pressure Resistance Test Method for Plastic Pipes for Fluid Transportation." Summary of the Invention

[0003] (1) Technical problems solved

[0004] In view of the deficiencies of the prior art, the present invention provides a novel pressure test sealing device for plastic pipes, which solves the problem of axial force applied to pipes during the centering process and the test process of the traditional sealing structure.

[0005] (2) Technical solution

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a new type of pressure test and sealing device for plastic pipes, comprising a positioning frame, an intermediate sealing section is installed in the middle and upper part of the positioning frame, and a hard plastic tube is arranged on the inner side of the intermediate sealing section, and a movable left plug and a movable right plug are respectively arranged at the left and right ends of the hard plastic tube, and a rubber sealing ring is arranged at the connection between the hard plastic tube and the movable left plug and the movable right plug, a clamping ring is arranged on the outside of the rubber sealing ring, and the middle parts of the clamping rings are connected to each other by fixing screws, a guide rail is arranged on the upper right part of the positioning frame, a pressure measuring port is provided on the outer side of the middle part of the movable right plug, and a stop valve is provided on the upper surface of the movable right plug, a pressure port is provided on the upper left part of the movable left plug, and a water pipe is connected to the lower left part of the movable left plug.

[0007] Preferably, the middle sealing section and the hard plastic tube are connected in a nested manner.

[0008] Preferably, the movable left plug and the movable right plug both form a disassembly and installation structure through a clamping ring and a hard plastic tube.

[0009] Preferably, the movable right plug forms a sliding structure through a guide rail, and the cross-sectional shape of the guide rail is arc-shaped.

[0010] Preferably, the clamping ring forms a disassembly and installation structure by fixing screws, and the structure is symmetrically arranged with respect to the mid-perpendicular line of the middle sealing section.

[0011] Preferably, the stop valve is a gas stop valve.

[0012] Preferably, the outside of the water pipe is connected to a three-way joint.

[0013] (3) Beneficial effects

[0014] The present invention provides a new pressure testing and plugging device for plastic pipes. It has the following beneficial effects:

[0015] (1) This new pressure test plugging device for plastic pipes has no direct contact between the movable left plug and the movable right plug and the hard plastic pipe. Instead, the hard plastic pipe is placed inside the middle sealing section. The sealing effect is achieved by moving the left plug, the movable right plug, the rubber sealing ring and the retaining ring, thereby eliminating the centering process of the traditional sealing structure and the axial force on the pipe during the test process.

[0016] (2) This new pressure test and sealing device for plastic pipes injects constant temperature water through the gap between the middle sealing section and the hard plastic pipe, ensuring that the temperature of the hard plastic pipe is constant during the test, eliminating the problem of temperature drop of the hard plastic pipe.

[0017] (3) The new pressure testing and plugging device for plastic pipes can reduce physical labor and shorten auxiliary operation time by using guide rails, thereby improving the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the cross-sectional main structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0021] In the figure: 1. Positioning frame; 2. Middle sealing section; 3. Hard plastic tube; 4. Movable left plug; 5. Movable right plug; 6. Rubber sealing ring; 7. Snap ring; 8. Fixing screw; 9. Guide rail; 10. Pressure measuring port; 11. Stop valve; 12. Pressure port; 13. Water pipe. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1-3 As shown, the present invention provides a technical solution: a new type of pressure test plugging device for plastic pipes, including a positioning frame 1, an intermediate sealing section 2, a hard plastic pipe 3, a movable left plug 4, a movable right plug 5, a rubber sealing ring 6, a clamping ring 7, a fixing screw 8, a guide rail 9, a pressure measuring port 10, a stop valve 11, a pressure port 12 and a water pipe 13. The intermediate sealing section 2 is installed in the middle and upper part of the positioning frame 1, and the hard plastic pipe 3 is provided on the inner side of the intermediate sealing section 2. The movable left plug 4 and the movable right plug 5 are provided on the left and right ends of the hard plastic pipe 3 respectively. A movable right plug 5 is provided, and a rubber sealing ring 6 is provided at the connection between the hard plastic tube 3 and the movable left plug 4 and the movable right plug 5. A snap ring 7 is provided on the outside of the rubber sealing ring 6, and the middle parts of the snap ring 7 are connected to each other by a fixing screw 8. A guide rail 9 is provided on the upper right part of the positioning frame 1, a pressure measuring port 10 is provided on the outer middle part of the movable right plug 5, and a stop valve 11 is provided on the upper surface of the movable right plug 5, a pressure port 12 is provided on the upper left part of the movable left plug 4, and a water pipe 13 is connected to the lower left part of the movable left plug 4;

[0024] The connection between the middle sealing section 2 and the hard plastic tube 3 is a nested connection, so that the device can complete the removal of the hard plastic tube 3;

[0025] The movable left plug 4 and the movable right plug 5 are connected to the hard plastic tube 3 through the clamping ring 7 to form a disassembly and installation structure, so that the device can complete the disassembly of the hard plastic tube 3 by disassembling the movable left plug 4 and the movable right plug 5;

[0026] The movable right plug 5 forms a sliding structure through the guide rail 9, and the cross-section of the guide rail 9 is an arc, so that the movable right plug 5 of the device can move to the top of the guide rail 9;

[0027] The clamping ring 7 is connected to the fixing screw 8 to form a disassembly and installation structure, and the structure is symmetrically arranged about the mid-perpendicular line of the middle sealing section 2, so that the device can complete the disassembly of the movable left plug 4 and the movable right plug 5 by disassembling the clamping ring 7;

[0028] The stop valve 11 is a gas stop valve, which can block the gas;

[0029] The outside of the water pipe 13 is connected to a three-way joint so that the water pipe 13 can be discharged from and enter the device better.

[0030] When in use, first rotate the fixing screw 8 to complete the removal of the clamping ring 7. After that, due to the removal of the clamping ring 7, the movable left plug 4 can be pulled out to the left, and then the hard plastic tube 3 is moved to the inside of the middle sealing section 2, and the hard plastic tube 3 is fixed by the fixing parts inside the middle sealing section 2. The movable left plug 4 is reconnected to complete the installation of the hard plastic tube 3. When the hard plastic tube 3 needs to be disassembled, the movable right plug 5 is removed, and the movable right plug 5 is moved to the bottom of the guide rail 9 under the action of the guide rail 9, which is convenient for the operator to remove the hard plastic tube 3 from the inside of the middle sealing section 2. At the same time, the contents not described in detail in this manual belong to the existing technology known to professional and technical personnel in this field.

[0031] In summary, the new pressure test sealing device for plastic pipes has no direct contact between the movable left plug 4 and the movable right plug 5 and the hard plastic pipe 3. Instead, the hard plastic pipe 3 is placed inside the middle sealing section 2. The sealing effect is achieved by moving the left plug 4, the right plug 5, the rubber sealing ring 6 and the retaining ring 7, thereby eliminating the centering process of the traditional sealing structure and the axial force exerted on the pipe during the test process. Constant temperature water is injected through the gap between the middle sealing section 2 and the hard plastic pipe 3. The temperature of the hard plastic pipe 3 is kept constant during the test, eliminating the problem of temperature drop of the hard plastic pipe 3. The use of the guide rail 9 can reduce physical labor and shorten the auxiliary operation time, thereby improving the working efficiency of the device.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A novel pressure testing and plugging device for plastic pipes, comprising a positioning frame (1), characterized in that: The middle upper portion of the positioning frame (1) is provided with an intermediate sealing section (2), and a hard plastic tube (3) is provided on the inner side of the intermediate sealing section (2), and a movable left plug (4) and a movable right plug (5) are provided on the left and right ends of the hard plastic tube (3), respectively, and a rubber sealing ring (6) is provided at the connection between the hard plastic tube (3) and the movable left plug (4) and the movable right plug (5), and a snap ring (7) is provided on the outer side of the rubber sealing ring (6), and the middle parts of the snap ring (7) are connected to each other by a fixing screw (8), a guide rail (9) is provided on the upper right side of the positioning frame (1), a pressure measuring port (10) is provided on the outer side of the middle part of the movable right plug (5), and a stop valve (11) is provided on the upper side surface of the movable right plug (5), a pressure port (12) is provided on the upper left side of the movable left plug (4), and a water pipe (13) is connected to the lower left side of the movable left plug (4); The connection between the middle sealing section (2) and the hard plastic tube (3) is a nested connection; The movable left plug (4) and the movable right plug (5) both form a disassembly and installation structure with the hard plastic tube (3) via a clamping ring (7); The movable left plug (4) and the movable right plug (5) do not directly contact the hard plastic tube (3), but the hard plastic tube (3) is placed inside the middle sealing section (2), and the sealing effect is achieved by the movable left plug (4), the movable right plug (5), the rubber sealing ring (6) and the clamping ring (7); The hard plastic tube (3) is fixed by means of a fixing piece inside the middle sealing section (2).

2. A novel pressure testing and plugging device for plastic pipes according to claim 1, characterized in that: The movable right plug (5) forms a sliding structure through a guide rail (9), and the cross-section of the guide rail (9) is arc-shaped.

3. A novel pressure testing and plugging device for plastic pipes according to claim 1, characterized in that: The clamping ring (7) forms a disassembly and installation structure through the fixing screw (8), and the structure is symmetrically arranged with respect to the mid-perpendicular line of the middle sealing section (2).

4. A novel pressure testing and plugging device for plastic pipes according to claim 1, characterized in that: The stop valve (11) is a gas stop valve.

5. The novel pressure testing and plugging device for plastic pipes according to claim 1, characterized in that: The outside of the water pipe (13) is connected to a three-way joint.

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