Airtight clamp

Abstract

The utility model relates to an airtight clamp. The airtight clamp comprises a clamp body and a pressurizing sealing ring, the clamp body comprises a pipe through hole which penetrates through the two ends of the clamp body and is used for a test sample to penetrate, and a positioning boss is arranged on the hole wall of the pipe through hole in a protruding mode and used for being matched with the test sample in an abutting mode. The pressurizing sealing ring is arranged in the pipe through hole and used for being arranged on the test sample in a sleeving mode, and the pressurizing sealing ring has a pressurizing state in which the pressurizing sealing ring expands in the radial direction after pressurizing and a shrinking state in which the pressurizing sealing ring shrinks in the radial direction after pressure relief. The airtight clamp is convenient to operate and good in sealing effect.

Description

Technical Field

[0001] The present application relates to the technical field of clamps, and in particular to an airtight clamp. Background Art

[0002] As the application of polyethylene gas pipelines in the gas industry continues to increase, the demand for polyethylene pipe fittings and valves has gradually increased, and the quality assessment of polyethylene pipe fittings and valve products has also tended to be standardized. However, there is a lack of specific test standards for the pressure drop performance test of such products, and the test equipment is not mature enough, which leads to inconvenience in the sealing connection between the sample and the test equipment. In addition, when the sample size has manufacturing deviations or poor roundness, test abnormalities or failures are prone to occur due to poor sealing. Summary of the invention

[0003] Based on this, it is necessary to provide an airtight clamp to reduce the difficulty of connection operation and ensure the sealing effect.

[0004] An airtight fixture, characterized by comprising:

[0005] A fixture body, wherein the fixture body has a tube through hole penetrating one end or both ends thereof and used for the test sample to pass through, and a positioning boss is convexly provided on the hole wall of the tube through hole, and the positioning boss positions the test sample;

[0006] A pressurized sealing ring is arranged in the tube through hole and is used to be sleeved on the test sample. The pressurized sealing ring has a pressurized state of radial expansion after pressurization and a contracted state of radial contraction after pressure relief.

[0007] The technical solution is further described below:

[0008] In one of the embodiments, a hole wall of the tube through hole is further provided with a limiting groove, and the pressure sealing ring is arranged in the limiting groove.

[0009] In one of the embodiments, in the contracted state, the pressurized sealing ring is accommodated in the limiting groove, and in the pressurized state, the pressurized sealing ring protrudes from the limiting groove and is used to seal and fix the test sample.

[0010] In one of the embodiments, the clamp body is provided with a pressure-charging hole connected to the pressure-charging sealing ring, and the pressure-charging hole passes through the outer wall of the clamp body.

[0011] In one of the embodiments, an air pipe connection port is provided in the pressure charging hole, and the air pipe connection port is used to connect the pressure charging system and a control valve, and the control valve is used to open or close the pressure charging hole.

[0012] In one embodiment, the positioning boss protrudes from the hole wall of the tube through hole along the radial direction of the clamp body, and the positioning boss extends along the circumferential direction of the clamp body to form a circular ring-shaped or ring-toothed protrusion structure.

[0013] In one embodiment, the fixture body is a straight cylindrical structure, and the fixture body is divided into a double-sided inflatable type and a single-sided inflatable type. The double-sided inflatable type fixture body is used to connect between the two test samples, and the two ends of the fixture body are provided with the pressure sealing rings, and the two pressure sealing rings are respectively arranged on both sides of the positioning boss, and the two pressure sealing rings are used to cooperate with the two test samples one by one. The single-sided inflatable type fixture body is used to connect the test sample with the test equipment, and the pressure sealing ring is provided at one end of the single-sided inflatable type fixture body, and a flange part is provided at the other end. The pressure sealing ring and the flange part are respectively arranged on both sides of the positioning boss, and the flange part is a flange-shaped structure, and the flange part is used to be flange-connected to the test device.

[0014] In one of the embodiments, a connecting hole is formed through the flange portion, and the connecting hole is used to pass a connecting piece connected to the flange of the testing device.

[0015] In one embodiment, the clamp body is made of a lightweight material.

[0016] In one of the embodiments, a chamfer is provided at the edge of the opening of the tube through hole.

[0017] In the above-mentioned airtight clamp, a pressurized sealing ring is arranged in the clamp body, and the pressurized sealing ring has a pressurized state of radial expansion after pressurization and a contracted state of radial contraction after pressure relief. In this way, when the test sample needs to be connected, the inner diameter of the pressurized sealing ring can be increased by depressurizing the pressurized sealing ring to enter the contracted state, which is convenient for the test sample to be quickly inserted into the pipe through hole of the clamp body and the pressurized sealing ring, and the operation is convenient and labor-saving. Then, by pressurizing the pressurized sealing ring to enter the pressurized state, the pressurized sealing ring can be expanded to close the gap between the clamp body and the test sample, thereby realizing a sealed connection between the clamp body and the test sample. At the same time, the pressurized sealing ring can adaptively compensate for the size error or roundness error of the test sample during the expansion process, so as to ensure a good sealing effect for the test sample with size deviation or poor roundness. In addition, by convexly setting a positioning boss on the hole wall of the pipe through hole, the positioning boss is used to position and cooperate with the test sample, which can effectively locate the insertion depth of the test sample, ensure the good cooperation between the test sample and the pressurized sealing ring, and further improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0021] Figure 1 Schematic diagram of the structure of an airtight clamp according to an embodiment.

[0022] Figure 2 for Figure 1 A cross-sectional view of the airtight fixture shown in FIG.

[0023] Figure 3 Schematic diagram of the structure of an airtight clamp according to another embodiment.

[0024] Figure 4 for Figure 3 A cross-sectional view of the airtight fixture shown in FIG.

[0025] Figure 5 The figure is a schematic diagram of the structure of a pressurized sealing ring in a contracted state according to an embodiment.

[0026] Figure 6 for Figure 5 The structural schematic diagram of the pressurized sealing ring in the pressurized state is shown in FIG.

[0027] Description of reference numerals:

[0028] 10. Clamp body; 101. Straight tube portion; 102. Flange portion; 11. Pipe through hole; 111. Chamfer; 12. Positioning boss; 13. Pressurizing hole; 14. Limiting groove; 15. Connecting hole; 20. Pressurizing sealing ring. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0035] As described in the background technology, the traditional sealed connection method between the sample and the test device is inconvenient to operate, and when the sample size has manufacturing deviation or poor roundness, it is easy to cause test abnormality or failure due to poor sealing. Specifically, in the pressure drop performance test, the sample tube end and the voltage-stabilizing tube section need to be connected to the pressure measuring end of the test device and the interface of the test device respectively. Generally, the interface of the test device is a metal flange connection port, but the sample tube end is a straight tube end of plastic material. When the two are connected, a plastic flange needs to be temporarily welded at the end of the sample tube, and multiple sections of the voltage-stabilizing tube sections need to be connected by hot melting or electric melting. On the one hand, this causes inconvenience in operation, and air leakage is prone to occur when the two flanges are disassembled and connected; on the other hand, when the hot melting method is used to connect multiple sections of the voltage-stabilizing tube sections, it is easy to cause the inner diameters of each voltage-stabilizing tube section to be not exactly the same, affecting the test effect, and when the electric melting method is used to connect multiple sections of the voltage-stabilizing tube sections, the test cost will increase.

[0036] Based on this, an embodiment of the present application provides an airtight fixture for sealingly connecting with a test sample. Specifically, the test sample includes but is not limited to a sample tube end, a voltage-stabilizing tube section, and other pipes. Specifically, see Figure 1 as well as Figure 2 The airtight fixture of an embodiment includes a fixture body 10 and a pressurized sealing ring 20, wherein the fixture body 10 includes a tube through hole 11 penetrating both ends thereof and used for the test sample to pass through, and a positioning boss 12 is convexly provided on the hole wall of the tube through hole 11, and the positioning boss 12 is used to abut and cooperate with the test sample to achieve positioning of the test sample, and the pressurized sealing ring 20 is arranged in the tube through hole 11 and is used to be sleeved on the test sample, see Figure 5as well as Figure 6 The inflatable sealing ring 20 has an inflated state in which it expands radially after being inflated, and a contracted state in which it contracts radially after being depressurized.

[0037] In the above-mentioned airtight clamp, a pressurized sealing ring 20 is arranged inside the clamp body 10, and the pressurized sealing ring 20 has a pressurized state in which it expands radially after pressurization and a contracted state in which it contracts radially after depressurization. In this way, when it is necessary to connect the test sample, the inner diameter of the pressurized sealing ring 20 can be increased by depressurizing the pressurized sealing ring 20 to enter the contracted state, so that the test sample can be quickly inserted into the tube through hole 11 of the clamp body 10 and the pressurized sealing ring 20, which is convenient and labor-saving to operate. Then, by pressurizing the pressurized sealing ring 20 to enter the pressurized state, the pressurized sealing ring 20 can be expanded to close the gap between the clamp body 10 and the test sample, thereby realizing a sealed connection between the clamp body 10 and the test sample. At the same time, the pressurized sealing ring 20 can adaptively compensate for the size error or roundness error of the test sample during the expansion process, thereby ensuring a good sealing effect for test samples with size deviation or poor roundness. In addition, by protruding a positioning boss 12 on the hole wall of the tube through hole 11 and utilizing the positioning boss 12 to abut against the test sample, the insertion depth of the test sample can be effectively positioned, ensuring good cooperation between the test sample and the pressurized sealing ring 20, and further improving the sealing effect.

[0038] See also Figure 2 Optionally, in one embodiment, the hole wall of the tube through hole 11 is further provided with a limiting groove 14, and the pressurized sealing ring 20 is arranged in the limiting groove 14. In this way, the limiting groove 14 can effectively limit the pressurized sealing ring 20, and prevent the pressurized sealing ring 20 from axial displacement or falling out of the tube through hole 11 during the connection process to affect the sealing effect. Preferably, the limiting groove 14 is an annular groove, and the extension direction of the limiting groove 14 is consistent with the circumference of the clamp body 10, thereby improving the limiting effect of the pressurized sealing ring 20.

[0039] Furthermore, in the contracted state, the pressurized sealing ring 20 is accommodated in the limiting groove 14, that is, the pressurized sealing ring 20 is hidden in the limiting groove 14 in the contracted state, thereby preventing the test sample from interfering with the pressurized sealing ring 20 during the insertion process, further improving the convenience of the test sample insertion operation. Furthermore, in the pressurized state, the pressurized sealing ring 20 protrudes from the limiting groove 14 and is used to seal and fix the test sample, so as to achieve a sealed connection between the pressurized sealing ring 20 and the test sample, ensuring the sealing effect.

[0040] See also Figure 2In one embodiment, a pressure-charging hole 13 connected to the pressure-charging seal ring 20 is provided in the clamp body 10, and the pressure-charging hole 13 penetrates the outer wall of the clamp body 10. In this way, the pressure-charging seal ring 20 can be pressurized or depressurized through the pressure-charging hole 13, so that the pressure-charging seal ring 20 enters a pressurized state or a contracted state. Furthermore, the pressure-charging hole 13 can be filled with air or liquid through a pump body or a high-pressure gas source or a high-pressure liquid source and the pressure-charging seal ring 20 is pressurized, which is not limited here.

[0041] It is worth noting that, in other embodiments, the pressure-charging sealing ring 20 may be directly charged through the charging pipeline, thereby eliminating the need to provide the charging hole 13 on the clamp body 10 .

[0042] Optionally, in one embodiment, a trachea connection port (not shown) is provided in the pressure-charging hole 13, and the trachea connection port is used to connect the pressure-charging system and the control valve, and the control valve is used to open or close the pressure-charging hole 13. Thus, by opening the control valve, the pressure-charging sealing ring 20 can be charged or relieved through the pressure-charging hole 13, and by closing the control valve, the air pressure of the pressure-charging sealing ring 20 can be maintained. Furthermore, the control valve can be a stop valve.

[0043] See also Figure 1 In one embodiment, the positioning boss 12 protrudes from the hole wall of the tube through hole 11 along the radial direction of the clamp body 10, and the positioning boss 12 extends along the circumferential direction of the clamp body 10 to form a circular ring-shaped or ring-toothed protrusion structure. Through the abutment and cooperation between the positioning boss 12 and the test sample, a sealing structure can be formed at the end of the test sample to seal the gap between the clamp body 10 and the test sample, thereby further improving the sealing effect.

[0044] Optionally, in one embodiment, the clamp body 10 is divided into a double-sided inflatable type and a single-sided inflatable type, see Figure 1 as well as Figure 2 , wherein the double-sided inflatable fixture body 10 is a straight-cylindrical structure, and the fixture body 10 is used to connect between two test samples. Both ends of the fixture body 10 are provided with pressure-charging seals 20, and the two pressure-charging seals 20 are respectively arranged on both sides of the positioning boss 12, and the two pressure-charging seals 20 are used to match the two test samples one by one. Specifically, both ends of the double-sided inflatable fixture body 10 are designed with equal diameters, and the double-sided inflatable fixture body 10 is used to connect between two sections of voltage-stabilizing pipe sections, and the two sections of voltage-stabilizing pipe sections are respectively sealed with the two pressure-charging seals 20, thereby eliminating the need to connect the two sections of voltage-stabilizing pipe sections by hot melting or electric melting, improving the sealing effect, and reducing the difficulty and cost of operation.

[0045] See also Figure 3 as well as Figure 4The single-side inflatable fixture body is a flange-shaped structure. The single-side inflatable fixture body 10 is used to connect the test sample and the test equipment. A straight tube portion 101 is provided at one end of the single-side inflatable fixture body, and a flange portion 102 is provided at the other end. The straight tube portion 101 is a straight tube-shaped structure. The straight tube portion 101 is used to connect with the test sample. A pressure sealing ring 20 is provided in the straight tube portion 101. The pressure sealing ring 20 and the flange portion 102 are respectively arranged on both sides of the positioning boss 12. The flange portion 102 is a flange-shaped structure. The flange portion 102 is used to be connected with the flange of the test device. Specifically, the sample tube end is connected through the straight tube portion 101, and the flange portion 102 is connected to the flange connection port of the test device, so as to realize the connection of the sample tube end to the interface of the test device, eliminating the process of temporarily welding the plastic flange at the sample tube end, simplifying the operation steps, and reducing the occurrence of air leakage, thereby improving the sealing effect.

[0046] Furthermore, the flange portion 102 is provided with a connecting hole 15 through it, and the connecting hole 15 is used to pass a connecting piece connected to the test device. Specifically, the connecting hole 15 is used to pass a bolt through it, and the bolt is used to connect to the flange of the test device.

[0047] Furthermore, in actual application scenarios, the test sample is a sample tube, which includes multiple sections of voltage-stabilizing tube segments and a sample tube end. The double-sided inflated airtight clamp and the single-sided inflated airtight clamp can be used in combination. Specifically, for example, the multiple sections of voltage-stabilizing tube segments are connected through a single-sided inflated airtight clamp, and then the sample tube end is connected to the flange interface of the testing device through the single-sided inflated airtight clamp, thereby realizing the pressure drop performance test of the sample tube.

[0048] Specifically, in one embodiment, the clamp body 10 is a lightweight material, such as aluminum or aluminum alloy. By configuring the clamp body 10 to be aluminum or aluminum alloy, the overall weight of the clamp body 10 can be effectively reduced. Furthermore, the aperture of the tube through hole 11 of the clamp body 10 is 2 mm larger than the outer diameter of the test sample, thereby ensuring that when the pressure seal ring 20 contracts, the test sample can easily penetrate into the tube through hole 11, and when the pressure seal is pressurized and expanded, the pressure seal can cooperate with the test sample in a sealed manner.

[0049] As shown in the figure, a chamfer 111 is provided at the edge of the opening of the tube through hole 11 , so that the opening of the tube through hole 11 can form a trumpet-shaped structure, thereby making it easier to pass the test sample into the tube through hole 11 .

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An airtight fixture, characterized in that: include: A fixture body, wherein the fixture body has a tube through hole penetrating one end or both ends thereof and used for the test sample to pass through, and a positioning boss is convexly provided on the hole wall of the tube through hole, and the positioning boss positions the test sample; A pressurized sealing ring, which is arranged in the tube through hole and is used to be sleeved on the test sample, and has a pressurized state in which it expands radially after being pressurized and a contracted state in which it contracts radially after being depressurized; The fixture body is divided into a double-sided inflatable type and a single-sided inflatable type; wherein, the fixture body of the double-sided inflatable type is used to connect between the two test samples, and the two ends of the fixture body are provided with the pressurized sealing rings, and the two pressurized sealing rings are respectively arranged on both sides of the positioning boss, and the two pressurized sealing rings are used to cooperate with the two test samples one by one; the fixture body of the single-sided inflatable type is used to connect the test sample with the test equipment, and the pressurized sealing ring is provided at one end of the fixture body of the single-sided inflatable type, and a flange part is provided at the other end, and the pressurized sealing ring and the flange part are respectively arranged on both sides of the positioning boss, and the flange part is a flange-like structure, and the flange part is used to be flange-connected with the test equipment.

2. The airtight fixture according to claim 1, characterized in that: The hole wall of the pipe through hole is also provided with a limiting groove, and the pressure-filled sealing ring is arranged in the limiting groove.

3. The airtight fixture according to claim 2, characterized in that: In the contracted state, the pressurized sealing ring is accommodated in the limiting groove, and in the pressurized state, the pressurized sealing ring protrudes from the limiting groove and is used to seal and fix the test sample.

4. The airtight fixture according to claim 1, characterized in that: A pressure-charging hole communicating with the pressure-charging sealing ring is arranged in the clamp body, and the pressure-charging hole passes through the outer wall of the clamp body.

5. The airtight fixture according to claim 4, characterized in that: An air pipe connection port is provided in the pressure charging hole, and the air pipe connection port is used to connect the pressure charging system and a control valve, and the control valve is used to open or close the pressure charging hole.

6. The airtight fixture according to claim 1, characterized in that: The positioning boss protrudes from the hole wall of the tube through hole along the radial direction of the clamp body, and the positioning boss extends along the circumferential direction of the clamp body to form a circular ring-shaped or ring-toothed protrusion structure.

7. The airtight fixture according to claim 1, characterized in that: The flange portion is provided with a connecting hole extending therethrough, and the connecting hole is used for passing a connecting piece connected to the flange of the testing equipment.

8. The airtight fixture according to claim 1, characterized in that: The clamp body is made of light material.

9. The airtight fixture according to claim 1, characterized in that: The opening edge of the tube through hole is chamfered.

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