Pipeline plug for air tightness detection

Abstract

The utility model discloses a pipeline plug for air tightness detection, which is used for plugging a pipeline and comprises an annular outer sleeve, an end wall and an annular inner sleeve, the end wall is hermetically connected to one axial end of the annular outer sleeve, and the annular outer sleeve surrounds the peripheral side of the annular inner sleeve. The end, away from the end wall, of the annular inner sleeve is connected to the annular outer sleeve in a sealed mode, a pressurizing cavity is formed between the annular inner sleeve and the annular outer sleeve, and when the annular inner sleeve is arranged on the outer side of the pipeline in a sleeving mode and inflates the pipeline, gas can enter the pressurizing cavity to extrude the annular inner sleeve so that the annular inner sleeve can be tightly attached to the outer side wall of the pipeline. According to the pipeline plug for airtightness detection, the plug can be prevented from being burst open by gas, the airtightness of the end of a pipeline is guaranteed, the plug is convenient to install and detach, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to a pipeline plug for air tightness detection. Background Art

[0002] When testing the air tightness of equipment, such as testing the air tightness of the welds of equipment pipelines, it is necessary to seal the ends of the pipelines with plugs to prevent gas from flowing out directly from the ends of the pipelines and reducing the testing effect. Existing plugs are generally directly inserted into the ends of the pipelines, but if they are not inserted tightly, the plugs can easily be blown open by the gas and the sealing is difficult to ensure. If they are inserted too tightly, it will be difficult to remove the plugs later, and the operation is cumbersome, time-consuming and labor-intensive. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a pipe plug for air tightness detection, which can not only prevent the plug from being blown open by gas and ensure the sealing of the end of the pipe, but also facilitate the installation and removal of the plug, saving time and effort.

[0004] The pipe plug for air tightness detection according to the embodiment of the utility model is used to seal the pipe, and the pipe plug for air tightness detection includes an annular outer sleeve, an end wall and an annular inner sleeve, the end wall is sealedly connected to one axial end of the annular outer sleeve, the annular outer sleeve surrounds the outer circumference of the annular inner sleeve, and the end of the annular inner sleeve away from the end wall is sealedly connected to the annular outer sleeve, and a pressurization chamber is formed between the annular inner sleeve and the annular outer sleeve, wherein, when the annular inner sleeve is arranged on the outside of the pipe and inflated into the pipe, the gas can enter the pressurization chamber and squeeze the annular inner sleeve so that the annular inner sleeve is close to the outer wall of the pipe.

[0005] The pipe plug for air tightness detection according to the embodiment of the utility model has at least the following beneficial effects:

[0006] When it is necessary to test the air tightness of the equipment, the annular inner sleeve of the plug is placed on the outside of the end of the pipeline, and air is inflated into the equipment, and then the pipeline is indirectly inflated. The air pressure in the pipeline gradually increases, and part of the gas in the pipeline will be squeezed into the boosting chamber between the annular inner sleeve and the annular outer sleeve. The air pressure in the boosting chamber increases, and the gas in the boosting chamber will then squeeze the annular inner sleeve. The annular inner sleeve is elastically deformed by the extrusion, and can be tightly attached to the outer wall of the pipeline, so that the friction between the pipeline and the annular inner sleeve is greatly increased, thereby ensuring that the plug is not blown open by the gas. After the test is completed, the equipment is deflated, and the gas in the boosting chamber is discharged, so that the tight fit between the annular inner sleeve and the outer wall of the pipeline can be released, and then the plug can be easily removed. According to the pipeline plug for air tightness testing according to the embodiment of the utility model, not only can the plug be prevented from being blown open by gas, thereby ensuring the sealing of the end of the pipeline, but also the operation is convenient when installing and removing the plug, saving time and effort.

[0007] According to some embodiments of the present invention, the boost chamber is arranged in an annular shape and surrounds the outer circumference of the annular inner sleeve.

[0008] According to some embodiments of the present invention, the center line of the boost chamber coincides with the center line of the annular inner sleeve.

[0009] According to some embodiments of the present invention, a side wall of the boost chamber close to the annular inner sleeve is formed with an inclined surface, and the distance between the inclined surface and the center line of the annular inner sleeve gradually increases in a direction close to the end wall.

[0010] According to some embodiments of the present utility model, the inclined surface is arranged in an annular shape and extends along the circumference of the annular inner sleeve.

[0011] According to some embodiments of the utility model, there is a first gap between the annular inner sleeve and the end wall, and a second gap between the annular inner sleeve and the annular outer sleeve. The second gap is located on a side of the boost chamber close to the end wall, and the second gap connects the first gap and the boost chamber.

[0012] According to some embodiments of the present invention, the width of the first gap is greater than the width of the second gap.

[0013] According to some embodiments of the utility model, a first groove is provided on a side of the annular outer sleeve close to the annular inner sleeve, and a second groove is provided on a side of the annular inner sleeve close to the annular outer sleeve, and the first groove and the second groove constitute the boost chamber.

[0014] According to some embodiments of the utility model, the pipe plug for air tightness detection also includes a positioning ring, which is arranged inside the end of the annular inner sleeve away from the end wall, and the center line of the positioning ring coincides with the center line of the annular inner sleeve.

[0015] According to some embodiments of the present invention, the inner diameter of the end of the annular inner sleeve away from the end wall gradually increases in a direction away from the end wall.

[0016] Additional aspects and advantages of the present invention will be partially given in the following description, and some advantages will become apparent from the following description or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of a pipe plug for air tightness detection according to an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram when the annular inner sleeve is arranged on the outside of the pipeline;

[0020] Figure 3 Schematic diagram of the flow of gas into the boost chamber.

[0021] Figure Number:

[0022] Ring jacket 100;

[0023] end wall 200;

[0024] Annular inner sleeve 300;

[0025] Pressurizing chamber 400; inclined surface 401; first groove 402; second groove 403;

[0026] First gap 500;

[0027] Second gap 600;

[0028] Positioning ring 700;

[0029] Pipeline 800. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention.

[0032] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] When performing air tightness testing on equipment, such as testing the weld between a fuel tank and a pipeline, it is necessary to seal the end of the pipeline with a plug to prevent the gas from flowing out directly from the end of the pipeline during inflation and affecting the test results.

[0035] In the prior art, the plug is generally inserted directly into the end of the pipe. However, if the plug is not inserted tightly, the plug can be easily blown open by the gas, and the sealing is difficult to ensure. If the plug is inserted too tightly, it will be difficult to remove the plug later, and the operation is cumbersome, time-consuming and laborious. In addition, some plugs are connected to the pipe threads, but in this way, the end of the pipe needs to be provided with an internal thread, which has a small scope of application and poor practicality.

[0036] Reference below Figures 1 to 3 The invention describes a pipe plug for air tightness detection according to an embodiment of the utility model.

[0037] refer to Figures 1 to 3 As shown, the pipe plug for air tightness detection according to the embodiment of the utility model is used to seal the pipe 800 , and the pipe plug for air tightness detection includes an annular outer sleeve 100 , an end wall 200 and an annular inner sleeve 300 .

[0038] Among them, the annular sleeve 100 can be in a circular ring shape, and the end wall 200 is sealed and connected to one axial end of the annular sleeve 100. Specifically, the end wall 200 can be integrally formed with the annular sleeve 100, and the end wall 200 can also be welded or bonded to one axial end of the annular sleeve 100. In this way, the sealing between the end wall 200 and the annular sleeve 100 can be achieved to prevent gas leakage from between the end wall 200 and the annular sleeve 100.

[0039] The annular outer sleeve 100 surrounds the outer circumference of the annular inner sleeve 300. The annular inner sleeve 300 may be in a circular shape. The annular outer sleeve 100 and the annular inner sleeve 300 may be coaxially arranged. One end of the annular inner sleeve 300 away from the end wall 200 is sealed and connected to the annular outer sleeve 100. Specifically, the end of the annular inner sleeve 300 away from the end wall 200 and the end of the annular outer sleeve 100 away from the end wall 200 may be integrally formed, or the end of the annular inner sleeve 300 away from the end wall 200 and the end of the annular outer sleeve 100 away from the end wall 200 may be welded or bonded. A pressurization chamber 400 is formed between the annular inner sleeve 300 and the annular outer sleeve 100. The annular inner sleeve 300 is used to sleeve the pipeline 800. For example, the annular inner sleeve 300 may be made of elastic rubber, elastic plastic or other materials capable of producing elastic deformation. In a natural state, the inner diameter of the annular inner sleeve 300 may be substantially equal to the outer diameter of the pipeline 800. The annular inner sleeve 300 is sleeved on the outer side of the pipeline 800.

[0040] When the annular inner sleeve 300 is sleeved on the outside of the pipe 800 and the pipe 800 is inflated, the gas can enter the pressurizing chamber 400 and squeeze the annular inner sleeve 300, so that the annular inner sleeve 300 is elastically deformed and adheres to the outer wall of the pipe 800.

[0041] In this embodiment, when it is necessary to perform an air tightness test on the equipment, the annular inner sleeve 300 of the plug is sleeved on the outer side of the end of the pipeline 800, and air is inflated into the equipment, and then the pipeline 800 is indirectly inflated. The air pressure in the pipeline 800 gradually increases, and part of the gas in the pipeline 800 will be squeezed into the boosting chamber 400 between the annular inner sleeve 300 and the annular outer sleeve 100. The air pressure in the boosting chamber 400 increases, and the gas in the boosting chamber 400 will then squeeze the annular inner sleeve 300. The annular inner sleeve 300 is elastically deformed by the squeezing, and can be tightly attached to the outer wall of the pipeline 800, so that the friction between the pipeline 800 and the annular inner sleeve 300 is greatly increased to ensure that the plug is not opened by the gas. After the test is completed, the equipment is deflated, and the gas in the boosting chamber 400 is discharged, so that the close fit between the annular inner sleeve 300 and the outer wall of the pipeline 800 can be released, and then the plug can be easily removed.

[0042] The pipe plug for air tightness detection according to the embodiment of the utility model can not only prevent the plug from being blown open by gas and ensure the sealing of the end of the pipe 800, but also is easy to operate during installation and removal of the plug, saving time and effort, and the pipe 800 does not need to be provided with an internal thread. The plug has a wide range of applications and better practicality.

[0043] In some embodiments of the present invention, Figures 1 to 3As shown, the boost chamber 400 is arranged in an annular shape and surrounds the outer circumference of the annular inner sleeve 300. With such an arrangement, when the gas in the pipeline 800 enters the boost chamber 400, the annular inner sleeve 300 can be squeezed at various positions in the circumferential direction, so that the annular inner sleeve 300 can be closely attached to the outer wall of the pipeline 800 at various positions in the circumferential direction, thereby making the sealing performance of the end of the pipeline 800 better.

[0044] In some embodiments of the present invention, Figures 1 to 3 As shown, the center line of the boost chamber 400 coincides with the center line of the annular inner sleeve 300. With such an arrangement, when the gas in the pipeline 800 enters the boost chamber 400, not only can the annular inner sleeve 300 be squeezed at various positions in the circumferential direction, but the squeezing force applied to the annular inner sleeve 300 is more uniform, thereby making the elastic deformation of the annular inner sleeve 300 more uniform, thereby achieving a better fit with the outer wall of the pipeline 800 and a better sealing effect.

[0045] It should be noted that in some other embodiments of the present invention, the center line of the boost chamber 400 and the center line of the annular inner sleeve 300 may also be slightly offset.

[0046] In some embodiments of the present invention, Figures 1 to 3 As shown, the side wall of the boost chamber 400 close to the annular inner sleeve 300 is formed with an inclined surface 401, and the distance between the inclined surface 401 and the center line of the annular inner sleeve 300 gradually increases in the direction close to the end wall 200. For example, the inclined surface 401 may be formed on the side of the boost chamber 400 close to the annular inner sleeve 300 and close to the end wall 200, and the closer to the end wall 200, the greater the distance between the inclined surface 401 and the center line of the annular inner sleeve 300. In this embodiment, when the gas in the pipeline 800 enters the boost chamber 400, part of the gas will squeeze the inclined surface 401. The provision of the inclined surface 401 can not only increase the force area, thereby making the annular inner sleeve 300 subject to greater extrusion force, but also make the elastic deformation effect of the annular inner sleeve 300 better, so that the annular inner sleeve 300 and the outer wall of the pipeline 800 fit more closely, and the sealing effect is better.

[0047] In some embodiments of the present invention, Figures 1 to 3 As shown, the inclined surface 401 is arranged in an annular shape and extends along the circumference of the annular inner sleeve 300. In this embodiment, such an arrangement can increase the force-bearing area at each position of the annular inner sleeve 300 in the circumferential direction, thereby making the annular inner sleeve 300 subjected to a greater extrusion force, and making the elastic deformation effect of each position of the annular inner sleeve 300 in the circumferential direction better, so that the annular inner sleeve 300 and the outer wall of the pipe 800 fit more closely, and the sealing effect is better.

[0048] In some embodiments of the present invention, Figures 1 to 3 As shown, there is a first gap 500 between the annular inner sleeve 300 and the end wall 200, and a second gap 600 between the annular inner sleeve 300 and the annular outer sleeve 100. The second gap 600 is located on the side of the boosting chamber 400 close to the end wall 200, and the second gap 600 communicates the first gap 500 and the boosting chamber 400. In this embodiment, there is a first gap 500 between the annular inner sleeve 300 and the end wall 200, and there is a second gap 600 between the annular inner sleeve 300 and the annular outer sleeve 100, which makes it easier for the gas in the pipeline 800 to enter the boosting chamber 400.

[0049] In some embodiments of the present invention, Figures 1 to 3 As shown, the width dimension of the first gap 500 is greater than the width dimension of the second gap 600. In this embodiment, the width dimension of the first gap 500 is set larger, which is more convenient for the gas in the pipeline 800 to quickly enter the boosting chamber 400, and the width dimension of the second gap 600 is set smaller, which can reduce the gas in the boosting chamber 400 from flowing back into the pipeline 800, thereby maintaining the air pressure in the boosting chamber 400 at a high level, thereby achieving a better squeezing effect on the annular inner sleeve 300, so that the annular inner sleeve 300 and the outer side wall of the pipeline 800 are more closely fitted, and the sealing effect is better.

[0050] In some embodiments of the present invention, Figures 1 to 3 As shown, a first groove 402 is provided on one side of the annular outer sleeve 100 close to the annular inner sleeve 300, and a second groove 403 is provided on one side of the annular inner sleeve 300 close to the annular outer sleeve 100, and the first groove 402 and the second groove 403 constitute a boost chamber 400. In this embodiment, the first groove 402 and the second groove 403 are respectively provided on the side close to the annular outer sleeve 100 and the annular inner sleeve 300, and the boost chamber 400 is formed by the first groove 402 and the second groove 403. In this way, while ensuring the volume of the boost chamber 400 and thus ensuring the squeezing effect on the annular inner sleeve 300, it can avoid reducing the structural strength by only opening a groove body on the annular outer sleeve 100 or the annular inner sleeve 300, thereby reducing the damage of the pipeline plug for air tightness detection of the utility model and extending the service life.

[0051] In some embodiments of the present invention, Figures 1 to 3As shown, the pipeline plug for air tightness detection also includes a positioning ring 700, which is arranged inside the end of the annular inner sleeve 300 away from the end wall 200, and the center line of the positioning ring 700 coincides with the center line of the annular inner sleeve 300. The positioning ring 700 can be made of hard materials such as stainless steel. The positioning ring 700 can prevent the end of the annular inner sleeve 300 away from the end wall 200 from deforming due to various reasons after long-term use, which makes it difficult to insert the pipeline 800, and the practicality is better. In addition, the position where the annular inner sleeve 300 is connected to the annular outer sleeve 100 can be structurally strengthened to prevent the position where the annular inner sleeve 300 is connected to the annular outer sleeve 100 from being damaged due to stress concentration.

[0052] In some embodiments of the present invention, Figures 1 to 3 As shown, the inner diameter of the end of the annular inner sleeve 300 away from the end wall 200 gradually increases in the direction away from the end wall 200. That is, the inner side of the end of the annular inner sleeve 300 away from the end wall 200 is provided with a chamfer, so that it is more convenient to insert the end of the pipe 800 into the annular inner sleeve 300, and then install the plug more conveniently.

[0053] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A pipe plug for air tightness detection, used for plugging a pipe, characterized in that: include: Ring jacket; An end wall, sealingly connected to one axial end of the annular sleeve; An annular inner sleeve, wherein the annular outer sleeve surrounds the outer circumference of the annular inner sleeve, an end of the annular inner sleeve away from the end wall is sealed and connected to the annular outer sleeve, and a pressurization chamber is formed between the annular inner sleeve and the annular outer sleeve; Wherein, when the annular inner sleeve is arranged on the outside of the pipe and the pipe is inflated, the gas can enter the pressurized chamber and squeeze the annular inner sleeve so that the annular inner sleeve is closely attached to the outer wall of the pipe.

2. The pipeline plug for air tightness detection according to claim 1, characterized in that: The boost chamber is arranged in an annular shape and surrounds the outer peripheral side of the annular inner sleeve.

3. The pipeline plug for air tightness detection according to claim 2, characterized in that: The center line of the boost chamber coincides with the center line of the annular inner sleeve.

4. The pipeline plug for air tightness detection according to claim 2, characterized in that: A side wall of the pressurizing chamber close to the annular inner sleeve is formed with an inclined surface, and a distance between the inclined surface and a center line of the annular inner sleeve gradually increases in a direction close to the end wall.

5. The pipeline plug for air tightness detection according to claim 4, characterized in that: The inclined surface is arranged in an annular shape and extends along the circumference of the annular inner sleeve.

6. The pipeline plug for air tightness detection according to any one of claims 1 to 5, characterized in that: A first gap is defined between the annular inner sleeve and the end wall, and a second gap is defined between the annular inner sleeve and the annular outer sleeve. The second gap is located on a side of the boost chamber close to the end wall, and the second gap connects the first gap and the boost chamber.

7. The pipeline plug for air tightness detection according to claim 6, characterized in that: The width dimension of the first gap is greater than the width dimension of the second gap.

8. The pipeline plug for air tightness detection according to any one of claims 1 to 5, characterized in that: A first groove is provided on one side of the annular outer sleeve close to the annular inner sleeve, and a second groove is provided on one side of the annular inner sleeve close to the annular outer sleeve. The first groove and the second groove constitute the boost chamber.

9. The pipeline plug for air tightness detection according to any one of claims 1 to 5, characterized in that: The pipeline plug for air tightness detection also includes: A positioning ring is arranged inside the end of the annular inner sleeve away from the end wall, and the center line of the positioning ring coincides with the center line of the annular inner sleeve.

10. The pipeline plug for air tightness detection according to any one of claims 1 to 5, characterized in that: The inner diameter of the end of the annular inner sleeve away from the end wall gradually increases in a direction away from the end wall.

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