Air tightness detection device

Abstract

The utility model discloses an air tightness detection device, which comprises a plugging head I and a plugging head II, the plugging head I and the plugging head II are connected through a pull rope and a high-pressure air pipe, the main body structures of the plugging head I and the plugging head II are the same, and each of the plugging head I and the plugging head II comprises a cover plate, a plugging head air cabin, an air bag ring frame and an air bag, the opening end of the air bag is fixed to a middle shaft of an air bag ring frame in a sealed mode, one side of each plug air cabin is connected with the air bag ring frame in a sealed mode, a cover plate is installed on the other side of each plug air cabin, and pressure release valves are arranged on the plug air cabins of the first plug and the second plug. According to the air tightness testing device provided by the embodiment of the utility model, a closed space to be tested can be easily and quickly isolated at any position in a long pipe, and the air tightness detection efficiency of the pipe is improved.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, and in particular to an airtightness testing device. Background Technology

[0002] Welding is a crucial step in metal pipeline fabrication. Welding quality directly affects the overall performance of the pipeline, especially its sealing. To ensure welding quality, post-weld pipeline quality inspection is necessary, with airtightness testing being a key indicator. In the initial quality inspection of low-pressure pipelines, the traditional method involves sealing both ends of the pipe and then filling it with gas for testing. However, this method has limitations, especially during welding. For long pipes where welding is only done at the ends, the traditional sealing method is inconvenient and reduces inspection efficiency. This limitation affects the production efficiency and quality control of long pipe welding, making it difficult to meet the high-efficiency and accurate welding quality inspection requirements of modern metal pipeline fabrication. Utility Model Content

[0003] The purpose of this invention is to provide an airtightness testing device. By setting a first sealing head and a second sealing head and a corresponding high-pressure air pipe, a sealed space to be tested can be quickly isolated at any position inside a long pipe, thereby improving the efficiency of airtightness testing of the pipe.

[0004] To achieve the above objectives, this utility model proposes an airtightness testing device, comprising a first sealing head and a second sealing head. The first sealing head and the second sealing head are connected by a pull rope and a high-pressure air pipe. The first sealing head and the second sealing head have the same main structure, each including a cover plate, a plug air chamber, an airbag ring frame, and an airbag. The opening end of the airbag is sealed and fixed on the central axis of the airbag ring frame. The central axis of the airbag ring frame is a hollow structure. The side wall of the central axis of the airbag ring frame is provided with a vent hole communicating with the airbag. The plug air chamber is sealed and connected to the airbag ring frame on one side, and a cover plate is installed on the other side. The axial side of the central axis of the airbag ring frame is provided with a through hole to communicate with the plug air chamber. The airbag ring frame of the second sealing head is additionally provided with an air source connector communicating with the central axis. Both the first sealing head and the second sealing head have pressure relief valves on their plug air chambers.

[0005] Furthermore, the two ends of the pull rope are respectively fixed to the middle of the cover plate on the first sealing head and the second sealing head, and the length of the pull rope is less than the length of the high-pressure gas pipe.

[0006] Furthermore, the first sealing head and the second sealing head are connected through the high-pressure air pipe, and the two ends of the high-pressure air pipe are respectively installed on the cover plate on one side of the first sealing head and the cover plate on one side of the second sealing head.

[0007] Furthermore, the air source connector is located on the side wall of the airbag ring frame of the second sealing head.

[0008] Furthermore, the pressure relief valve is installed on the valve body mounting hole of the plug air chamber. The pressure relief valve includes a valve body, a compression spring, an air plug, a valve cover, and a clamping screw. The valve body is provided with a pressure plate one and a pressure plate two, and a compression spring is provided between the pressure plate one and the pressure plate two. An air plug is fixed on one side of the pressure plate two. A pressure relief air inlet is provided in the middle of one side of the valve body. The air plug abuts against the pressure relief air inlet through the compression spring. A valve cover is installed on the other side of the valve body. The clamping screw is threaded to the valve cover and abuts against the pressure plate one. A pressure relief air outlet is provided on the side of the valve body.

[0009] Furthermore, the pressure relief valve is installed facing the interior of the plug chamber.

[0010] Furthermore, the first pressure plate and the second pressure plate are in clearance fit with the inner cavity of the valve body.

[0011] The beneficial effects of the airtightness testing device of this utility model are as follows: It is equipped with a first sealing head and a second sealing head, and a high-pressure air pipe connected to both. During use, the first and second sealing heads are placed inside the pipe to be tested, so that the airtightness test area is located between the first and second sealing heads. When an external testing air source inflates the first and second sealing heads through the air source connector, the air bladders on the first and second sealing heads expand. Due to the lateral restriction of the air bladder ring frame, the air bladder expands outward, thus sealing the gap between the inner wall of the pipe to be tested and the first and second sealing heads. When further pressurized, the pressure relief valve begins to vent air into the sealed space enclosed by the first and second sealing heads and the side wall of the pipe. The airtightness is comprehensively judged by detecting the amount of gas leakage after the gas stabilizes using external testing equipment. This device can quickly isolate a sealed test space at any position within a long pipe.

[0012] Additional advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] Figure 1 This is a front view of an airtightness testing device according to an embodiment of the present utility model;

[0014] Figure 2This is a schematic diagram of the sealing head structure of an airtightness testing device according to an embodiment of the present utility model;

[0015] Figure 3 This is a schematic diagram of the sealing head of an airtightness testing device according to an embodiment of the present utility model;

[0016] Figure 4 This is a side view of the sealing head of an airtightness testing device according to an embodiment of the present utility model;

[0017] Figure 5 This is a schematic diagram of the pressure relief valve structure of an airtightness testing device according to an embodiment of the present utility model.

[0018] Attached reference numerals: 1. Plug head 1; 2. Plug head 2; 3. Pull rope; 4. Pressure relief valve; 5. High-pressure air pipe; 6. Air source connector; 7. Airbag; 8. Valve body mounting hole; 9. Cover plate; 10. Plug air chamber; 11. Airbag ring frame; 12. Central shaft; 13. Through hole; 14. Vent hole; 15. Compression spring; 16. Air plug; 17. Pressure relief air inlet hole; 18. Compression screw; 19. Valve cover; 20. Valve body; 21. Pressure plate 1; 22. Pressure plate 2; 23. Pressure relief air outlet hole. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The following description, with reference to the accompanying drawings, describes an airtightness testing device according to an embodiment of the present invention.

[0024] like Figure 1-5 As shown, an airtightness testing device according to an embodiment of the present invention includes a sealing head 1 and a sealing head 2. The sealing head 1 and the sealing head 2 are connected to a high-pressure air pipe 5 by a pull rope 3. The sealing head 1 and the sealing head 2 have the same main structure, each including a cover plate 9, a sealing head air chamber 10, an airbag ring frame 11, and an airbag 7. The open end of the airbag 7 is sealed and fixed on the central axis 12 of the airbag ring frame 11. The central axis 12 of the airbag ring frame 11 is a hollow structure, and the side wall of the central axis 12 of the airbag ring frame 11 is provided with... The air vent 14 of the airbag 7 allows gas from the central shaft 12 to enter the airbag 7. The plug air chamber 10 is sealed to one side by the airbag ring frame 11, and a cover plate 9 is installed on the other side. A through hole 13 is provided on one side of the central shaft 12 of the airbag ring frame 11 to connect the airbag ring frame 11 with the plug air chamber 10. An air source connector 6 connected to the central shaft 12 is added to the airbag ring frame 11 of the second plug 2. Both the first plug 1 and the second plug 2's plug air chambers 10 are equipped with pressure relief valves 4.

[0025] In this embodiment, the sealing head 1 and sealing head 2 have the same main structure and function to seal any section of the pipe, thus sealing the area to be tested. When the external detection gas source inflates the sealing head 1 and sealing head 2 through the gas source connector 6, the air bladder 7 on the sealing head 1 and sealing head 2 expands. Due to the side restriction of the air bladder ring frame 11, the air bladder 7 expands outward, thereby sealing the gap between the inner wall of the pipe to be tested and the sealing head 1 and sealing head 2. Through this operation, a sealed area to be tested is formed between the sealing head 1, sealing head 2, and the pipe to be tested. When the pressure is further increased, the pressure relief valve 4 starts to vent air into the sealed space formed by the sealing head 1, sealing head 2, and the side wall of the pipe. The air tightness is comprehensively judged by detecting the amount of gas leakage after the gas stabilizes through external detection equipment.

[0026] like Figure 1 As shown, the two ends of the pull rope 3 are fixed to the middle of the cover plate 9 on the sealing head 1 and the sealing head 2 respectively, and the length of the pull rope 3 is less than the length of the high-pressure air pipe 5.

[0027] The main function of the pull rope 3 in this embodiment is that when air is circulated in the sealed area formed by the first plug head 1, the second plug head 2 and the side wall of the pipe, the first plug head 1 and the second plug head 2 will be moved towards the axis of the pipe by force. The pull rope 3 restricts the outward movement of the first plug head 1 and the second plug head 2, so that the area to be tested remains stable. The length of the pull rope 3 is shorter than that of the high-pressure gas pipe 5, mainly to protect the high-pressure gas pipe 5 and prevent the high-pressure gas pipe 5 from being pulled and broken by the first plug head 1 and the second plug head 2.

[0028] like Figure 1 As shown, the sealing head 1 and the sealing head 2 are connected by a high-pressure air pipe 5. The two ends of the high-pressure air pipe 5 are respectively installed on the cover plate 9 on one side of the sealing head 1 and the cover plate 9 on one side of the sealing head 2.

[0029] In this embodiment, the cover plate 9 is fixed to the plug air chamber 10 by threads. Different lengths of pull rope 3 and high-pressure air pipe 5 accessories can be replaced according to the actual situation to meet the testing requirements of different pipe sealing areas.

[0030] like Figure 1 , Figure 3 As shown, the air source connector 6 is located on the side wall of the airbag ring frame 11 of the sealing head 2. The external air source pipeline passes through the inner cavity of the pipe to be tested and connects to the air source connector 6 on the side wall of the airbag ring frame 11 of the sealing head 2. The air source pipeline as a whole will not interfere with the expansion of the airbag 7 of the device.

[0031] like Figure 1 , Figure 4 as well as Figure 5 As shown, the pressure relief valve 4 is installed on the valve body mounting hole 8 of the plug air chamber 10. The pressure relief valve 4 includes a valve body 20, a compression spring 15, an air plug 16, a valve cover 19, and a clamping screw 18. The valve body 20 is provided with a pressure plate 1 21 and a pressure plate 22. A compression spring 15 is provided between the pressure plate 1 21 and the pressure plate 22. An air plug 16 is fixed on one side of the pressure plate 22. A pressure relief air inlet 17 is provided in the middle of one side of the valve body 20. The air plug 16 abuts against the pressure relief air inlet 17 through the compression spring 15. A valve cover 19 is installed on the other side of the valve body 20. The clamping screw 18 is threaded to the valve cover 19 and abuts against the pressure plate 1 21. A pressure relief air outlet 23 is provided on the side of the valve body 20. The pressure relief air inlet 17 end of the pressure relief valve 4 faces the inside of the plug air chamber 10. The pressure plate 1 21 and the pressure plate 22 are clearance fit with the inner cavity of the valve body 20.

[0032] In this embodiment, the elastic thrust of the spring 15 on the air plug 16 can be adjusted by rotating the clamping screw 18, thereby adjusting the pressure relief threshold. In actual use, the pressure can be adjusted according to the test requirements. For example, if a higher pressure test is required, the pressure relief threshold can be increased by rotating the clamping screw 18. At this time, the pressure inside the airbag 7 increases when air is vented, and the squeezing force on the side wall of the pipe is high. The gas in the sealed area formed between the first plug 1, the second plug 2 and the side wall of the pipe is less likely to escape from between the airbag 7 and the side wall of the pipe. The pressure in the sealed area is higher, thereby increasing the test pressure range.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A leak tightness testing device comprising a first obturator (1) and a second obturator (2), characterized in that: The first plug head (1) and the second plug head (2) are connected by a pull rope (3) and a high-pressure gas pipe (5), the first plug head (1) and the second plug head (2) have the same main structure, both including a cover plate (9), a plug gas chamber (10), a gas bag ring frame (11) and a gas bag (7), the open end of the gas bag (7) is sealingly fixed on the central shaft (12) of the gas bag ring frame (11), the central shaft (12) of the gas bag ring frame (11) is a hollow structure, the sidewall of the central shaft (12) of the gas bag ring frame (11) is provided with a gas communication hole (14) in communication with the gas bag (7), one side of the plug gas chamber (10) is sealingly connected with the gas bag ring frame (11), and the other side is provided with the cover plate (9), and one side of the central shaft (12) of the gas bag ring frame (11) is provided with a through hole (13) to make the gas bag ring frame (11) communicate with the plug gas chamber (10), the gas bag ring frame (11) of the second plug head (2) is additionally provided with a gas source connector (6) in communication with the central shaft (12), and the plug gas chamber (10) of the first plug head (1) and the second plug head (2) is provided with a pressure relief valve (4).

2. The air tightness detection device according to claim 1, wherein: The pull rope (3) is fixed at the middle part of the cover plate (9) on the first plug head (1) and the second plug head (2), respectively, and the length of the pull rope (3) is less than the length of the high-pressure gas pipe (5).

3. The air tightness detection device according to claim 1, wherein: The first plug head (1) and the second plug head (2) are connected by the high-pressure gas pipe (5), and the high-pressure gas pipe (5) is installed at the cover plate (9) on one side of the first plug head (1) and the cover plate (9) on one side of the second plug head (2), respectively.

4. The air tightness detection device of claim 1, wherein: The gas source connector (6) is arranged on the sidewall of the gas bag ring frame (11) of the second plug head (2).

5. The air tightness detection device of claim 1, wherein: The pressure relief valve (4) is installed on the valve body mounting hole (8) of the plug gas chamber (10), and the pressure relief valve (4) comprises a valve body (20), a compression spring (15), a gas plug (16), a valve cover (19) and a compression screw (18), the valve body (20) is provided with a pressure plate one (21) and a pressure plate two (22), the compression spring (15) is arranged between the pressure plate one (21) and the pressure plate two (22), the gas plug (16) is fixed on one side of the pressure plate two (22), the valve body (20) is provided with a pressure relief inlet hole (17) at the middle part of one side, the gas plug (16) abuts at the pressure relief inlet hole (17) through the compression spring (15), the valve cover (19) is installed on the other side of the valve body (20), the compression screw (18) is threadedly connected with the valve cover (19) and abuts against the pressure plate one (21), and the valve body (20) is provided with a pressure relief outlet hole (23) on the side surface.

6. The air tightness detection device according to claim 5, wherein: The end of the pressure relief inlet hole (17) of the pressure relief valve (4) is installed towards the inside of the plug gas chamber (10).

7. The air tightness detection device according to claim 5, wherein: The pressure plate one (21), the pressure plate two (22) and the inner cavity of the valve body (20) are gap-fitted.

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