A small-diameter connection pressure sealing device

Abstract

The utility model relates to pipeline connection technical field, and disclose a small pipe diameter connection place pressure plugging device. The device first passes the screw thread of second interface one end with tee, and the device is screwed with gas pipeline, then hollow steel pole and threaded steel pole are inserted from the third interface of tee, and the hollow steel pole is fixed through the lock nut, prevents its in subsequent operation deviation, then, in use, first close the copper ball valve, then loosen the nut, and rotate threaded steel pole, drive threaded steel pole to move upward with the aid of threaded drive, thereby make the copper plug close to the hollow steel pole direction. At this moment, the rubber sleeve between copper plug and hollow steel pole close to the second interface end portion is continuously compressed, gradually expands and tightly fits the inner wall of gas pipeline, finally, without depressurization, stop gas, complete the pressure plugging of small pipe diameter pipeline connection.

Description

Technical Field

[0001] This utility model relates to the field of pipeline connection technology, and in particular to a pressurized sealing device for small-diameter pipe connections. Background Technology

[0002] The control areas of existing gas pipelines and gas equipment are equipped with ball valves of different types and sizes to control the natural gas in the pipeline. Venting ball valves are installed at both ends of the control ball valves for venting work such as pipeline pressure overpressure and maintenance.

[0003] Regarding the above-mentioned and existing related technologies, the inventors believe that the following defects often exist: Since the connection between the ball valve and the pipeline is mostly made of threaded connection, and is also affected by the temperature of the operating environment, resulting in large fluctuations, and in daily use, the ball valve needs to be opened and closed frequently, which also directly leads to air leakage at the threaded connection between the ball valve and the pipeline. The existing solution is usually to continuously tighten the threads, but even after tightening, the air leakage still cannot be eliminated. Only pressure reduction and gas supply shutdown can be adopted. Moreover, this approach will affect the normal gas supply of upstream and downstream users, especially industrial and commercial users. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing technology has the disadvantage of air leakage at the connection between the ball valve and the pipeline, and requires pressure reduction and gas shutdown. To this end, we propose a pressurized sealing device for small-diameter pipe connections.

[0005] To achieve the above objectives, this application adopts the following technical solution: a pressure-sealing device for small-diameter pipe connections, comprising: a tee, and a first interface, a second interface, and a third interface disposed on the outer surface of the tee. A copper ball valve is disposed at one end of the first interface, and a threaded connection is provided at one end of the second interface. A hollow steel rod is disposed through the second interface and the third interface. A threaded steel rod is disposed through the interior of the hollow steel rod along its axial direction. The outer surface of the hollow steel rod is detachably fixed to the third interface by a lock nut. A nut is threadedly sleeved on the outer surface of the threaded steel rod near the third interface. A copper plug is disposed at one end of the threaded steel rod near the second interface. A rubber sleeve is sleeved on the outer surface of the threaded steel rod. The rubber sleeve is located between the copper plug and the end of the hollow steel rod near the second interface, enabling pressure sealing without the need for pressure reduction or gas shutdown.

[0006] Preferably, a sealing ring is provided at the connection between the lock nut and the third interface to increase the sealing performance.

[0007] Preferably, a pressure gauge is installed on the outer surface of the tee via a threaded connector. The detection end of the pressure gauge is connected to the interior of the tee. A sealing gasket is provided at the connection between the threaded connector and the tee to improve safety.

[0008] Preferably, the end of the thread furthest from the second interface is threadedly connected to the external gas pipeline, and the entire assembly is installed at the gas pipeline that needs to be sealed.

[0009] Preferably, the inner diameter of the rubber sleeve is interference-fitted with the outer wall of the threaded steel rod, and the maximum outer diameter of the rubber sleeve after compression and expansion is greater than the inner wall diameter of the hollow steel rod, which is suitable for sealing small-diameter pipes.

[0010] Preferably, the outer surface of the threaded steel rod is provided with several threaded segments to improve the flexibility of sealing.

[0011] The technical effects and advantages of this utility model are as follows: In this invention, the device first connects the tee to the gas pipeline threadedly through the threaded end of the second interface. Then, a hollow steel rod and a threaded steel rod are inserted into the third interface of the tee, and the hollow steel rod is secured with a lock nut to prevent it from shifting during subsequent operations. Next, in use, the copper ball valve is closed, the nut is loosened, and the threaded steel rod is rotated. The threaded transmission causes the threaded steel rod to move upwards, bringing the copper plug closer to the hollow steel rod. At this time, the rubber sleeve located between the copper plug and the end of the hollow steel rod near the second interface is continuously compressed, gradually expanding and tightly fitting against the inner wall of the gas pipeline. Finally, pressure sealing of the small-diameter pipe connection is completed without the need for pressure reduction or gas shut-off. Attached Figure Description

[0012] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an internal schematic diagram of the overall structure of this utility model.

[0013] Legend: 1. Copper plug; 2. Rubber sleeve; 3. Threaded steel rod; 31. Nut; 4. Thread; 5. Hollow steel rod; 6. Tee; 61. First interface; 62. Second interface; 63. Third interface; 7. Copper ball valve; 8. Pressure gauge; 9. Lock nut. Detailed Implementation

[0014] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0015] Reference Figure 1 and Figure 2 As shown, this utility model provides a technical solution: a pressurized sealing device for small-diameter pipe connections, comprising: a tee 6, and a first interface 61, a second interface 62, and a third interface 63 disposed on the outer surface of the tee 6. A copper ball valve 7 is disposed at one end of the first interface 61 for controlling the flow of the internal medium of the device. A threaded connection 4 is threaded to one end of the second interface 62. A hollow steel rod 5 is inserted between the second interface 62 and the third interface 63. A threaded steel rod 3 is inserted through the hollow steel rod 5 along its axial direction. The outer surface of the hollow steel rod 5 is detachably fixed to the third interface 63 via the lock nut 9. The outer surface of the threaded steel rod 3 near the third interface 63 is threaded with a nut 31. A copper plug 1 is provided at one end of the threaded steel rod 3 near the second interface 62. A rubber sleeve 2 is fitted on the outer surface of the threaded steel rod 3. The rubber sleeve 2 is located between the copper plug 1 and the end of the hollow steel rod 5 near the second interface 62. By turning the threaded steel rod 3, the copper plug 1 can be moved towards the hollow steel rod 5, thereby compressing the rubber sleeve 2 and causing it to expand. Pressurized sealing can be achieved without depressurization or gas stoppage.

[0016] Reference Figure 1 and Figure 2 As shown in this embodiment, a sealing ring is provided at the connection between the lock nut 9 and the third interface 63 to increase the sealing performance and prevent gas leakage.

[0017] A pressure gauge 8 is installed on the outer surface of the tee 6 via a threaded connector. The detection end of the pressure gauge 8 is connected to the interior of the tee 6. A sealing gasket is provided at the connection between the threaded connector and the tee 6 to monitor the internal pressure data and prevent sealing failure due to abnormal pressure.

[0018] The end of thread 4 furthest from the second interface 62 is threadedly connected to the external gas pipeline, facilitating the connection of the overall structure to the existing gas pipeline.

[0019] The inner diameter of the rubber sleeve 2 is interference-fitted with the outer wall of the threaded steel rod 3. The maximum outer diameter of the rubber sleeve 2 after compression and expansion is greater than the inner wall diameter of the hollow steel rod 5, thus adapting to the sealing requirements of small-diameter pipes.

[0020] The outer surface of the threaded steel rod 3 is provided with several threaded segments to improve the flexibility of sealing.

[0021] Working Principle: The device first connects the tee 6 to the gas pipeline threadedly via the thread 4 at one end of the second interface 62. Then, the hollow steel rod 5 and the threaded steel rod 3 are inserted into the third interface 63 of the tee 6, and the hollow steel rod 5 is secured by the lock nut 9 to prevent it from shifting during subsequent operations. A sealing ring is provided at the connection between the lock nut 9 and the third interface 63 to enhance sealing. Next, during use, the copper ball valve 7 is closed, then the nut 31 is loosened, and the threaded steel rod 3 is rotated. The threaded transmission causes the threaded steel rod 3 to move upwards, thus bringing the copper plug 1 closer to the hollow steel rod 5. At this time, the rubber sleeve 2 located between the copper plug 1 and the end of the hollow steel rod 5 near the second interface 62 is continuously compressed, gradually expanding and tightly fitting the inner wall of the gas pipeline until the pressure gauge 8 shows stable pressure. Finally, without needing to reduce pressure or stop gas flow, the pressure sealing of the small-diameter pipeline connection is completed. The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A pressurized sealing device for small-diameter pipe connections, characterized in that: The device includes a tee, and a first interface, a second interface, and a third interface disposed on the outer surface of the tee. One end of the first interface is provided with a copper ball valve, and one end of the second interface is threaded with a thread. A hollow steel rod is inserted through the second interface and the third interface. A threaded steel rod is inserted through the interior of the hollow steel rod along its axial direction. The outer surface of the hollow steel rod is detachably fixed to the third interface by a lock nut. A nut is threaded onto the outer surface of the threaded steel rod near the third interface. A copper plug is provided at the end of the threaded steel rod near the second interface. A rubber sleeve is fitted on the outer surface of the threaded steel rod, and the rubber sleeve is located between the copper plug and the end of the hollow steel rod near the second interface.

2. The pressurized sealing device for small-diameter pipe connections according to claim 1, characterized in that: A sealing ring is provided at the connection between the lock nut and the third interface.

3. The pressurized sealing device for small-diameter pipe connections according to claim 1, characterized in that: A pressure gauge is installed on the outer surface of the tee via a threaded connector. The detection end of the pressure gauge is connected to the interior of the tee. A sealing gasket is provided at the connection between the threaded connector and the tee.

4. The pressurized sealing device for small-diameter pipe connections according to claim 1, characterized in that: The end of the thread furthest from the second interface is connected to the thread of an external gas pipeline.

5. The pressurized sealing device for small-diameter pipe connections according to claim 1, characterized in that: The inner diameter of the rubber sleeve is interference-fitted with the outer wall of the threaded steel rod, and the maximum outer diameter of the rubber sleeve after compression and expansion is greater than the inner wall diameter of the hollow steel rod.

6. The pressurized sealing device for small-diameter pipe connections according to claim 1, characterized in that: The outer surface of the threaded steel rod is provided with several threaded segments.

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