Valve body internal leakage detection device

Abstract

The utility model provides a valve body internal leakage detection device, and belongs to the technical field of valve detection. The valve body internal leakage detection device comprises a fixing seat and a detection joint connected with the fixing seat, the fixing seat is provided with a fixing structure used for fixing the fixing seat and the detection joint outside a valve plug, and the detection joint is provided with an inner cavity and a connection interface communicated with the inner cavity and used for being connected with a detection instrument. The detection connector further comprises a butt joint structure which is communicated with the inner cavity and used for being in sealed butt joint with a first exhaust hole in the valve plug. When the device is used, the detection connector is communicated with the first exhaust hole of the screwed plug in a sealed mode to form a detection channel, the device is tightly pressed on the screwed plug in a sealed mode through the fixing structure, when a valve is detected, only an inner hexagonal stud on the screwed plug needs to be unscrewed, pressure in a cavity is transmitted to a detection instrument through the detection channel, reading changes of the detection instrument are observed, and the leakage condition of the valve body is judged.

Description

Technical Field

[0001] The utility model relates to a valve body leakage detection device, belonging to the technical field of valve detection. Background Art

[0002] Natural gas pipeline venting refers to the release of gas in the pipeline during pipeline maintenance, repair, and replacement of pipelines and equipment to reduce pipeline pressure, reduce hazards, and ensure safety. Venting is an important part of pipeline maintenance and is also a necessary measure to ensure safe and stable operation of the pipeline. During long-term use of valves, the seals are prone to aging or deformation, which affects the airtightness of the device and leads to internal leakage. Therefore, valve internal leakage is an important inspection item in daily valve maintenance.

[0003] The existing valve body is provided with a plug, the specific structure of the plug is as follows Figure 1 and Figure 2 As shown, the screw plug 1 is a columnar structure with a threaded end. An exhaust hole 11 is provided on the side wall of the non-threaded end of the screw plug 1 along the diameter direction. The exhaust hole 11 has a first exhaust hole 111 and a second exhaust hole 112 for connecting to the detection device. The inner cavity of the screw plug is a step hole 15. The exhaust hole 11 and the step hole 15 can connect the inner cavity of the screw plug with the outside world. A steel ball 13 is placed in the step hole 15. In order to prevent the steel ball 13 from falling off during use, specifically, the diameter of the steel ball 13 is between the maximum diameter and the minimum diameter of the step hole 15. A hexagonal stud 12 is screwed into the large diameter end of the step hole, and a limit ring 14 is also provided on the large diameter end to prevent the hexagonal stud 12 from falling out during use. When the hexagonal screw 12 in the plug 1 is tightened to press the steel ball 13, the plug 1 is in a closed state to ensure the air tightness of the valve; when the hexagonal screw 12 is loosened, the plug 1 is in an open state, and the steel ball 13 is pushed open by the pressure difference between the inside and outside of the valve body to vent the valve.

[0004] In the existing methods for detecting valve internal leakage, it is usually necessary to close the valve and vent the gas in the inner cavity of the valve. If no gas leaks from the exhaust hole after the gas in the inner cavity of the valve is vented, it means that the valve has no internal leakage. If the gas in the inner cavity of the valve cannot be vented for a long time, it means that the valve has internal leakage. For example, a buoy-type flow tool for detecting valve internal leakage disclosed in the Chinese utility model patent with authorization announcement number CN217687760U and authorization announcement date October 28, 2022 includes a cylinder with a hollow cavity inside, an air inlet pipe is provided on the side of the cylinder, one end of the air inlet pipe is connected to the inner cavity of the cylinder and the other end is connected to the outlet end of the low-pressure leak detector, and a transparent tube assembly is provided on the top of the cylinder, which is connected to the inner cavity of the cylinder and marked with a scale, and the internal sliding seal assembly of the transparent tube assembly is provided with a float for rising when the inner cavity of the cylinder is inflated. When in use, first connect the float flow tool to the low-pressure leak detector. When the plug is a single-sided exhaust hole plug, after the valve is vented, connect the low-pressure leak detector to the plug exhaust hole to test the valve. Figure 1-2 When the double-sided exhaust holes are plugged with thread, wait until the valve is vented, connect the low-pressure leakage detector to the first exhaust hole or the second exhaust hole with the thread plug, plug the unconnected exhaust hole, and inspect the valve. The amount of natural gas leakage can be judged by observing the position change of the float or, when the float does not change obviously, by the sound of the airflow in the throttling elbow.

[0005] In actual production, valves are generally large in size, and there is a lot of natural gas remaining in the valve body. Using the above tools to detect internal leakage requires the natural gas in the valve body to be vented, which causes natural gas waste, pollutes the environment, and easily causes safety risks for operators. In addition, the valve needs to be shut down for a long time during the venting process, which will cause certain pressure on production operations and affect production efficiency. At the same time, after the valve body is closed, it is also difficult to clean the impurities deposited in the inner cavity of the valve body. Utility Model Content

[0006] The utility model aims to provide a valve body leakage detection device to solve the technical problem that the natural gas in the valve body needs to be vented when the valve is leaked, which causes waste of natural gas.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A valve body internal leakage detection device, the device includes a fixed seat and a detection connector connected to the fixed seat, the fixed seat is provided with a fixing structure for fixing the fixed seat and the detection connector to the outside of the valve plug, the detection connector has an inner cavity, the detection connector includes a connection interface that is connected to the inner cavity and is used to connect a detection instrument, and the detection connector also includes a docking structure that is connected to the inner cavity and is used to seal and dock with a first exhaust hole on the valve plug.

[0009] Furthermore, the docking structure is a docking head for inserting into the first exhaust hole.

[0010] Furthermore, the butt joint is tapered so that the outer tapered surface of the butt joint is press-fitted with the opening of the first exhaust hole.

[0011] Furthermore, the fixing seat is annular so that the fixing seat can be sleeved on the outside of the valve plug, the docking joint protrudes from the inner wall of the fixing seat, and the detection joint also includes a joint body located outside the fixing seat.

[0012] Furthermore, the fixing seat is annular so that the fixing seat can be sleeved on the outside of the valve plug. A tightening screw for tightening the valve plug is threadedly assembled on the fixing seat, and the tightening screw constitutes the fixing structure.

[0013] Furthermore, the tightening screw is arranged opposite to the docking structure.

[0014] Furthermore, the end of the tightening screw is provided with a conical head for extending into the second exhaust hole on the valve plug and pressing against the opening of the second exhaust hole.

[0015] Furthermore, the fixing seat is in a square ring shape, and includes four connecting rods connected in sequence, and the tightening screw and the detection joint are respectively connected to two connecting rods arranged opposite to each other.

[0016] Furthermore, the detection joint also includes a cleaning interface which is communicated with the inner cavity and is used to introduce a cleaning medium into the valve plug and the inner cavity of the valve body through the detection joint, and a plug is detachably connected to the cleaning interface.

[0017] Furthermore, the detection joint is a T-shaped three-way joint, which includes a horizontal pipe and a vertical pipe vertically connected to the horizontal pipe, the docking structure and the cleaning interface are respectively located at both ends of the horizontal pipe, and the connecting interface is the end of the vertical pipe.

[0018] The beneficial effect of the above technical solution is that the utility model is a pioneering invention. The detection instrument is installed on the detection joint to form a detection part, and then the detection part and the fixed seat are fixedly installed on the valve plug through a fixed structure. The detection joint is sealed and connected with the first exhaust hole of the plug to form a detection channel. The fixed structure presses the device seal on the plug. When testing the valve, it is only necessary to unscrew the hexagonal stud on the plug. The detection instrument can detect the pressure in the cavity. By observing the change in the reading of the detection instrument, the leakage of the valve body can be judged. If there is an internal leakage in the valve, the reading on the instrument will gradually increase over time and eventually reach a state of pressure balance with the natural gas pipeline; if the valve has good air tightness, the reading on the instrument will remain at a stable value. Using this device for detection avoids the problem of natural gas waste caused by the need to vent the natural gas in the valve body before detection in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a thread plug on an existing valve body;

[0020] Figure 2 It is a cross-sectional view of a thread plug on an existing valve body;

[0021] Figure 3 It is a structural schematic diagram of an embodiment of a valve body leakage detection device of the utility model;

[0022] Figure 4 This is a schematic diagram of the use state of the valve body leakage detection device embodiment of the utility model;

[0023] Figure 5 It is a cross-sectional view of the use state of the valve body leakage detection device embodiment of the utility model.

[0024] In the figure: 1. Thread plug; 11. Exhaust hole; 111. First exhaust hole; 112. Second exhaust hole; 12. Hexagon socket stud; 13. Steel ball; 14. Limiting ring; 15. Step hole; 2. Fixing seat; 21. Fixing nut; 3. T-shaped three-way joint; 31. Connection interface; 32. Joint body; 33. Butt joint; 4. Plug; 5. Testing instrument; 6. Tightening screw. DETAILED DESCRIPTION

[0025] The patent with the authorization announcement number CN217687760U in the prior art discloses a buoy-type flow tool for detecting internal leakage of valves, wherein the side of the cylinder is provided with an air inlet pipe, the top of the cylinder is provided with a transparent tube assembly which is connected to the inner cavity of the cylinder and marked with a scale, and the internal sliding seal assembly of the transparent tube assembly is provided with a floating ball which rises when the inner cavity of the cylinder is inflated. When in use, the buoy-type flow tool is first connected with a low-pressure leakage detector, when the plug is a plug for a single-sided exhaust hole, after the valve is emptied, the low-pressure leakage detector is connected with the plug exhaust hole, and the valve is tested; when the plug is a plug for a double-sided exhaust hole, after the valve is emptied, the low-pressure leakage detector is connected with the first exhaust hole or the second exhaust hole of the plug, the exhaust hole which is not connected is blocked, and the valve is tested, and the amount of natural gas leakage is judged by observing the position change of the floating ball, or when the change of the floating ball is not obvious, by the sound of the air flow in the throttling elbow. The venting process of using the above tools to detect internal leakage requires the valve to be shut down for a long time, which will cause certain pressure on production operation and affect production efficiency. At the same time, after the valve body is closed, it is difficult to clean the impurities deposited in the inner cavity of the valve body.

[0026] The present invention proposes a pioneering technical solution to the problems existing in the above technical solutions. The core concept of the present invention is: utilizing the existing thread plug 1 on the valve body, installing a fixing seat 2 on the thread plug 1, fixing the fixing seat 2 on the thread plug 1 by utilizing a fixing structure, installing a detection joint on the fixing seat 2, and sealingly installing a detection instrument 5 for detection on the detection joint. The inner cavity of the detection joint and the inner cavity of the thread plug are sealed and connected. When in use, the valve needs to be closed, and the hexagonal stud 12 on the thread plug 1 is loosened. The gas in the valve cavity can push open the steel ball 13 and enter the inner cavity of the detection joint from the exhaust hole of the thread plug 1. At this time, the detection instrument 5 can measure the pressure in the inner cavity of the thread plug. The change of the indication of the detection instrument 5 is observed within a certain period of time. If the indication does not change, it is determined that there is no internal leakage of the valve body.

[0027] Based on the above conception: the valve body leakage detection device of the utility model embodiment is as follows: Figure 3-5 As shown, there is a fixed seat 2 and a detection connector connected to the fixed seat 2, and a fixed structure for fixing the fixed seat 2 and the detection connector to the outside of the valve plug is provided on the fixed seat 2. The detection connector has an inner cavity, and the detection connector includes a connection interface that is connected to the inner cavity and used to connect the detection instrument 5. When in use, the detection instrument 5 can be connected to the above-mentioned connection interface. The detection connector also includes a docking structure that is connected to the inner cavity and used to seal and dock with the first exhaust hole on the valve plug. In this embodiment, the exhaust hole 11 on the existing plug 1 is used to communicate with the detection connector, and the fixed structure fixes the fixed seat 2 and the plug 1. The docking structure is sealed and docked with the first exhaust hole to ensure the airtightness of the docking between the device and the plug 1, so that the gas in the inner cavity of the plug can enter the inner cavity of the detection connector from the docking structure. Specifically, the detection instrument 5 can be a precision digital pressure gauge disclosed in the Chinese utility model patent with authorization announcement number CN218822949U, and its working principle will not be described in detail here.

[0028] Different from the prior art, this embodiment forms a detection part by installing the detection instrument on the detection joint, and then fixes the detection part and the fixed seat on the valve plug through a fixed structure. The detection joint is sealed and connected with the first exhaust hole of the plug to form a detection channel. The fixed structure seals and presses the device on the plug. When testing the valve, it is only necessary to unscrew the hexagonal stud on the plug, and the cavity and the inner cavity of the valve are connected. The pressure in the inner cavity of the valve can be measured, and the leakage of the valve body can be judged by observing the change of the reading of the detection instrument. If there is an internal leakage in the valve, the gas in the natural gas pipeline will enter the inner cavity of the valve, and the reading of the instrument will gradually increase over time and eventually reach a balance with the natural gas pipeline; if the valve has good air tightness, the reading of the instrument will maintain a stable value. When using this device for testing, there is no need to discharge natural gas to the outside, which avoids the problem of natural gas waste caused by the need to vent the natural gas in the valve body before testing in the prior art.

[0029] As a feasible implementation, the docking structure is a docking joint 33 for inserting into the first exhaust hole 111. The docking joint 33 is a part of the detection joint. When in use, the docking joint 33 can be directly inserted into the first exhaust hole 111 to complete the docking, which is convenient for use. In other implementations, the docking structure can also adopt other forms besides the docking joint 33, such as the form of docking. Specifically, the docking structure can be a structure with an outer circumference larger than the first exhaust hole 111. When docking, the docking structure can abut against the side of the wire plug 1. A sealing ring or other structure is required between the docking structure and the wire plug 1 to ensure a sealed connection of the device.

[0030] More specifically, the docking joint 33 is tapered so that the outer conical surface of the docking joint 33 is pressed against the orifice of the first exhaust hole 111. The outer peripheral surface of the docking joint 33 is a conical surface. When the docking joint 33 is inserted into the first exhaust hole 111, the conical surface can be used to press the contact surface with the exhaust hole. Preferably, the detection joint can be made of a metal material with low hardness, such as copper. When in use, the docking joint 33 and the first exhaust hole 111 are interference fit. Due to the low hardness of the docking joint 33, the docking joint 33 can be adaptively deformed during the installation process, so as to fit with the exhaust hole to ensure the airtightness of the device and avoid leakage during the detection process, which affects the detection results. In other embodiments, the docking joint may not be set to a cone, as long as the airtightness of the connection between the detection joint and the first exhaust hole can be guaranteed. For example, the docking joint is a circular tube, and a sealing ring can be sleeved on the outer periphery of the docking joint.

[0031] The fixing seat 2 is annular so that the fixing seat 2 can be sleeved on the outside of the valve plug, and the docking joint 33 protrudes from the inner wall of the fixing seat 2. The detection joint also includes a joint body 32 located on the outside of the fixing seat 2. The fixing seat 2 is sleeved on the outside of the valve plug 1, which can increase the contact area between the detection device and the valve plug 1, which is beneficial to improve the contact stability between the two. The docking joint protrudes from the inner wall of the fixing seat, so that when in use, the docking joint can be directly inserted into the first exhaust hole, improving the convenience of device connection. In other embodiments, the fixing seat can be a clamping structure, which includes a clamping claw, which is clamped on the plug by the claw when in use.

[0032] On the basis of the annular fixing seat 2, a tightening screw 6 for tightening the valve plug is threadedly assembled on the fixing seat 2, and the tightening screw 6 constitutes the fixing structure. When in use, after the fixing seat 2 is sleeved on the outside of the plug 1, the tightening screw 6 can be screwed, and one end of the tightening screw 6 is close to the plug 1, so that the fixing seat 2 can clamp the plug 1. This method has higher efficiency. In other embodiments, the fixing seat 2 can also be welded to the plug 1 to form a permanent fixing structure. Of course, it is understandable that in other embodiments, other fasteners can also be used to fix the fixing seat 2 to the plug 1, such as using a flexible rope to tie the fixing seat 2 to the plug 1.

[0033] The tightening screw 6 is arranged opposite to the docking structure. Figure 4 and Figure 5 As shown, the tightening screw 6 and the docking joint 33 are arranged relative to each other. In this way, the reaction force (clamping force) of the screw plug 1 on the tightening screw 6 is perpendicular to the abutting surface of the docking structure used to abut the screw plug 1, thereby ensuring the sealing effect of the screw plug 1 and the docking structure. In addition, screwing the tightening screw 6 can change the clamping force of the screw plug 1 and the docking structure. When the docking joint is conical, this can ensure that the docking joint can reliably contact the first exhaust hole to ensure the sealing effect. In other embodiments, the tightening screw can be set on the side of the docking structure, or multiple tightening screws can be set to achieve the fixation of the fixing seat 2.

[0034] More specifically, the end of the tightening screw 6 is provided with a conical head for extending into the second exhaust hole 112 on the valve plug and pressing against the opening of the second exhaust hole 112. In this way, the second exhaust hole 112 can be directly blocked while the fixing seat 2 is installed. It should be noted that in the prior art, some plugs have only one exhaust hole, and in this case, the end of the tightening screw 6 may not be provided with a conical head. Of course, for a plug with two exhaust holes, an independent blocking piece may also be provided to block the exhaust hole that is not used during detection.

[0035] Preferably, the tightening screw 6 is a butterfly screw, which can be conveniently screwed directly by hand, so that the device can be quickly disassembled and installed, which is convenient for maintenance and replacement of the device.

[0036] The fixing seat 2 is in a square ring shape, and includes four connecting rods connected in sequence, and the jacking screw 6 and the detection joint are respectively connected to two connecting rods arranged opposite to each other. In this way, when the fixing seat 2 is matched with the screw plug 1 with a hexagonal outer circumference, it can be ensured that the fixing seat 2 has a larger contact area with the screw plug 1. Of course, in other embodiments, the fixing seat can also be a ring of other shapes, such as a circular ring, as long as it can be sleeved on the valve screw plug.

[0037] In addition to realizing the above-mentioned detection function, the detection joint also includes a cleaning interface that is connected to the inner cavity and is used to pass the cleaning medium into the valve plug and the inner cavity of the valve body through the detection joint. The cleaning interface is detachably installed with a plug 4. When the valve cavity needs to be cleaned, the plug 4 can be removed and the cleaning pipeline can be connected through the cleaning joint. The cleaning medium in the cleaning pipeline can enter the plug through the inner cavity and the first exhaust hole, and enter the valve through the plug 1, realizing the "one machine with two uses" of the internal leakage detection device.

[0038] Specifically, the detection joint can be a straight pipe, in which case the cleaning interface is the connection interface 31, the detection instrument 5 is unscrewed, and the cleaning medium is introduced to clean the valve body. After cleaning, a plug 4 can be installed at the cleaning interface, and the plug 4 is easy to disassemble and assemble. The plug 4 can be a threaded plug, which can be directly screwed on the cleaning interface. In other embodiments, the plug can be set as a sealing cover or other forms of plugs.

[0039] The detection joint can also be a T-shaped three-way joint 3, such as Figure 5 As shown, the detection joint includes a horizontal pipe and a vertical pipe vertically connected to the horizontal pipe, the docking structure and the cleaning interface are respectively located at both ends of the horizontal pipe, and the connection interface 31 is the end of the vertical pipe. The use of the T-shaped three-way connector 3 can directly clean the valve cavity without disassembling the detection instrument 5.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve body internal leakage detection device, characterized in that: It includes a fixing seat and a detection connector connected to the fixing seat. A fixing structure for fixing the fixing seat and the detection connector on the outside of the valve plug is provided on the fixing seat. The detection connector has an inner cavity. The detection connector includes a connection interface that is connected to the inner cavity and is used to connect a detection instrument. The detection connector also includes a docking structure that is connected to the inner cavity and is used to seal and dock with the first exhaust hole on the valve plug.

2. The valve body internal leakage detection device according to claim 1, characterized in that: The docking structure is a docking head for inserting into the first exhaust hole.

3. The valve body internal leakage detection device according to claim 2, characterized in that: The butt joint is tapered so that the outer tapered surface of the butt joint is press-fitted with the opening of the first exhaust hole.

4. The valve body internal leakage detection device according to claim 2 or 3, characterized in that: The fixing seat is annular so that the fixing seat can be sleeved on the outside of the valve plug, the docking joint protrudes from the inner side wall of the fixing seat, and the detection joint also includes a joint body located outside the fixing seat.

5. The valve body internal leakage detection device according to any one of claims 1 to 3, characterized in that: The fixing seat is annular so that the fixing seat can be sleeved on the outside of the valve plug. The fixing seat is threadedly equipped with a tightening screw for tightening the valve plug, and the tightening screw constitutes the fixing structure.

6. The valve body internal leakage detection device according to claim 5, characterized in that: The tightening screw is arranged opposite to the butt joint structure.

7. The valve body internal leakage detection device according to claim 6, characterized in that: The end of the tightening screw is provided with a conical head which is used for extending into the second exhaust hole on the valve plug and pressing and contacting with the opening of the second exhaust hole.

8. The valve body internal leakage detection device according to claim 5, characterized in that: The fixing seat is in a square ring shape and comprises four connecting rods connected in sequence. The tightening screw and the detection joint are respectively connected to two connecting rods arranged opposite to each other.

9. The valve body internal leakage detection device according to any one of claims 1 to 3, characterized in that: The detection joint also includes a cleaning interface which is communicated with the inner cavity and is used to introduce a cleaning medium into the valve plug and the inner cavity of the valve through the detection joint, and a plug is detachably connected to the cleaning interface.

10. The valve body internal leakage detection device according to claim 9, characterized in that: The detection joint is a T-shaped three-way joint, which includes a horizontal pipe and a vertical pipe vertically connected to the horizontal pipe. The docking structure and the cleaning interface are respectively located at both ends of the horizontal pipe, and the connecting interface is the end of the vertical pipe.

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