A shut-off valve with a leakage warning structure

Abstract

This invention discloses a stop valve with a leakage warning structure, comprising a valve body, a stop structure, and a sensing component. The valve body has an inlet hole, an outlet hole, and a stop hole connecting the two at its bottom. The stop structure includes a valve stem and a valve plug, with the valve plug sealed to the stop hole by a sealing ring. The sensing component includes a water immersion sensing mechanism and a water immersion display mechanism. The inner wall of the stop hole has a stop surface and an overflow surface; the valve plug has first and second separating rings and a sensing groove, with the separating rings having an overflow groove corresponding to the overflow surface. The water immersion sensing mechanism includes several sensing elements within the sensing groove, with odd and even sensing elements respectively connected to the two electrodes of the display mechanism, and a third overflow groove on the outer ring. The water immersion display mechanism uses a control unit to detect the conductivity between the sensing elements and controls a switching transistor to drive the display terminal. This invention can promptly detect and warn of leaks at the valve plug seal, improving safety.

Description

Technical Field

[0001] This invention relates to a gate valve with a leakage warning structure, belonging to the field of valve equipment. Background Technology

[0002] Due to the shut-off action of gate valves, during the locking process, the seals will experience sliding friction and compression with the inner wall of the sealing hole, which can lead to seal damage and leakage. Current valve leakage detection mainly relies on pressure changes at both ends of the pipeline. However, thermal expansion and contraction, as well as elastic deformation, all cause pressure changes in the pipeline, making it difficult to detect minute leaks caused by seal wear. Furthermore, after the gate valve is closed, the other end of the pipeline may be completely depressurized in some cases, making it impossible to detect pipeline leaks based on pressure changes. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the limitations of existing technologies in detecting leaks by pipeline pressure, and to provide a shut-off valve with a leak warning structure.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A shut-off valve with a leakage warning structure includes:

[0006] The valve body has an inlet hole and an outlet hole at the bottom, and the inlet hole and the outlet hole are connected by a stop hole; the top of the valve body is provided with a stop structure, which includes a valve stem threadedly connected to the valve body, and a valve plug rotatably connected to the end of the valve stem. The front end of the valve plug is in sealed contact with the stop hole through a sealing ring.

[0007] Also includes:

[0008] The sensing component includes a water immersion sensing mechanism located at the rear end of the valve plug corresponding to the seal and a water immersion display mechanism located inside the valve plug.

[0009] Among them, an annular stop surface and an overflow surface are sequentially arranged on the inner wall of the stop hole along the moving axis of the valve plug;

[0010] The valve plug has a first partition ring at its front end, and the outer ring of the first partition ring has a plurality of first overflow grooves with axes parallel to the valve plug. A sealing ring is provided between the front end of the valve plug and the first partition ring, and the sealing ring is used to seal against the stop surface. The valve plug has a second partition ring at its rear end, and the outer ring of the second partition ring has a plurality of second overflow grooves with axes parallel to the valve plug. A ring-shaped sensing groove is provided between the second partition ring and the first partition ring, and the outer opening of the sensing groove is arranged corresponding to the overflow surface.

[0011] The water immersion sensing mechanism includes a ring of several conductive material sensing sheets arranged in an array within a sensing groove. There are sensing gaps between the sensing sheets. The odd-numbered sensing sheets and the even-numbered sensing sheets are respectively connected to two electrodes of the water immersion display mechanism. Several third overflow grooves are arranged in a ring array around the outer ring of the sensing sheets.

[0012] The water immersion display mechanism includes an operational controller. The voltage detection terminal of the operational controller is connected in series with the water immersion sensing mechanism to the drive circuit of the drive power supply. The output terminal of the operational controller is connected to the control terminal of the switching transistor. The display terminal of the water immersion display mechanism is connected in series with the drive circuit of the drive power supply through the switching transistor.

[0013] As a further improvement of the present invention, the inner ring array of the sensing element is provided with through holes and connecting holes arranged at intervals, and an insulating ring is embedded in the through holes; a connecting bracket is provided in the sensing slot, the connecting bracket includes a plurality of conductive support columns made of conductive material arranged in a ring array between the sensing slots, the conductive support columns include positive electrode support columns and negative electrode support columns, the positive electrode support columns are interference-fitted with the connecting holes of the odd-numbered sensing elements and pass through the through holes of the odd-numbered sensing elements, the negative electrode support columns are interference-fitted with the connecting holes of the even-numbered sensing elements and pass through the through holes of the even-numbered sensing elements, and the conductive support columns are connected to the corresponding electrodes;

[0014] The induction element uses a conductive support column that integrates the conductive electrode and support structure, which simplifies the structure, reduces the complexity of the cable, and ensures the stability of the spacing between the induction elements.

[0015] As a further improvement of the present invention, an insulating pad ring coaxial with the conductive support column is provided between adjacent sensing sheets.

[0016] The insulating gasket ring can provide additional spacer support when the fixing between the induction element and the conductive support post fails, further ensuring the stability of the spacing between the induction elements.

[0017] As a further improvement of the present invention, a pressure driving chamber is provided in the middle of the valve plug, and a one-way valve with the opening direction facing the pressure driving chamber is provided at the top of the valve plug. The front end of the valve stem is rotatably and sealingly connected to the valve plug through a rotating connector. A transmission hole is provided in the middle of the valve stem, and a vent hole is provided in the rotating connector. The transmission hole and the one-way valve are connected through the vent hole. Several pressure relief holes communicating between the pressure driving chamber and the sensing groove are provided through the inner wall of the pressure driving chamber and the inner wall of the sensing groove.

[0018] The pressure-driven chamber can clear the liquid between the sensing plates during valve closure, thereby resetting the immersion sensing mechanism, improving its dryness and sensitivity, and preventing the immersion sensing mechanism from failing after the valve is opened.

[0019] As a further improvement of the present invention, a transition ring is provided at the top of the pressure driving chamber, the outer ring of the transition ring is in sealed contact with the inner wall of the pressure driving chamber, an annular inlay groove is provided in the transition ring, the immersion display mechanism is placed in the inlay groove, and the connecting line of the immersion sensing mechanism passes through the pressure relief hole and is connected to the transition ring.

[0020] The immersion display mechanism is installed in a separate adapter ring, which improves maintainability, while the pressure in the pressure drive chamber can reduce the possibility of the immersion display mechanism getting wet.

[0021] As a further improvement of the present invention, a first connecting ring is provided in the middle of the adapter ring. The outer wall of the first connecting ring is in sealed contact with the inner wall of the air guide hole. Two sets of conductive contacts are provided on the inner wall of the first connecting ring. The conductive contacts are connected to the display end of the water immersion display mechanism through wires. A plug rod is connected to the transmission hole by a thread. The top end of the plug rod extends to the outside of the valve rod. An LED indicator is provided at the top end of the plug rod. Two sets of conductive rings connected to the indicator are provided at the end of the plug rod. The conductive rings are used to contact the conductive contacts to realize the conductive connection between the display end and the LED indicator.

[0022] The stopper rod can not only seal the transmission hole, but also serve as an extension mechanism to enable an illuminated display on the top of the valve stem, making it easier to observe the status.

[0023] As a further improvement of the present invention, an adapter seat is fixed on the top of the valve plug; the rotary connector includes a fixed ring fixed to the adapter seat and a rotary sleeve rotatably connected to the fixed ring; a stepped hole is provided at the top of the fixed ring, a stepped surface that is clearance-fitted with the stepped hole is provided at the front end of the valve stem, an air guide hole is provided at the end of the fixed ring, and the air guide hole communicates with the end of the stepped hole; a retaining ring is also provided at the front end of the valve stem, and the retaining ring makes limiting contact with the bottom of the air guide hole; an inner limiting ring is provided at the connection position of the valve stem corresponding to the rotary sleeve, the inner ring of the rotary sleeve is sleeved on the outside of the valve stem and makes limiting contact with the limiting ring; an outer limiting ring is provided on the outer ring of the fixed ring, the inner wall of the rotary sleeve makes sliding sealing contact with the outer wall of the fixed ring, and the front end of the rotary sleeve makes sliding sealing contact with the end of the outer limiting ring;

[0024] The rotating connection mechanism is located between the valve plug and the valve stem, which allows the valve plug and the sealing ring to be relatively stationary and fixed. This reduces the wear of the sealing ring during valve closure and eliminates the need for dynamic wiring for the immersion sensing mechanism and immersion display mechanism, thus simplifying the structure.

[0025] As a further improvement of the present invention, a limiting ring is fixed below the valve plug by a thread, and a second connecting ring is provided at the top of the inner ring of the limiting ring. The second connecting ring is threadedly connected to the inner wall of the pressure driving chamber, and a second separating ring is sleeved and fixed to the outer ring of the second connecting ring. The pressure relief hole includes pressure relief connecting holes arranged in an array on the second connecting ring. The pressure relief hole also includes a plurality of pressure relief grooves arranged in an annular array at the bottom of the inner wall of the pressure driving chamber. The bottom of the pressure relief groove is provided with a pressure relief opening connected to the pressure relief connecting hole, and the top of the pressure relief groove has a gradually expanding structure and opens at the bottom of the sensing groove.

[0026] The sensing groove structure is a split structure with a detachable second connecting ring, which facilitates the installation and maintenance of the immersion sensing mechanism.

[0027] As a further improvement of the present invention, a sealing ring is disposed at the bottom of a limiting ring. The sealing ring includes a contact portion disposed on the outer annular side wall of the limiting ring and a limiting portion disposed at the bottom of the limiting ring. A compression ring is connected to the bottom of the limiting ring via a flange. A bottom spring is fixed to the outer ring of the compression ring by the compression ring. The limiting portion of the sealing ring is in limiting contact with the bottom spring. A top spring is disposed inside the second separating ring. The top spring is in contact with the top end of the contact portion.

[0028] The sealing ring uses two sets of spring plates for limiting and clamping. The spring plates provide good axial support for the sealing ring, reducing the possibility of the sealing ring coming off or deforming in the axial direction.

[0029] As a further improvement of the present invention, a volume filling block is also provided in the pressure driving chamber, and the volume filling block is made of a porous material.

[0030] The volume filler block can reduce the gas volume in the pressure drive chamber and improve the sensitivity of the pneumatic drive.

[0031] The beneficial effects of this invention are:

[0032] This invention detects leaks by setting a water immersion sensing structure at the valve plug position and utilizing the change in resistance caused by the slow leakage due to a damaged sealing ring. It does not rely on pressure detection and can still detect water seepage even under pressure loss conditions, making it more versatile. Attached Figure Description

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0035] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0036] Figure 3This is a schematic diagram of the adapter ring;

[0037] Figure 4 This is a schematic diagram of the sensor's structure;

[0038] Figure 5 This is a circuit diagram illustrating the function of the water immersion sensing mechanism;

[0039] In the diagram: 1. Valve housing; 2. Inlet; 3. Outlet; 4. Shut-off hole; 5. Valve cover; 6. Valve stem; 7. Turning ring; 8. Valve plug; 9. Limiting ring; 10. Second connecting ring; 11. Pressure relief connection hole; 12. Pressure relief groove; 13. Pressure drive chamber; 14. Volume filling block; 15. First separating ring; 16. First overflow groove; 17. Second separating ring; 18. Second overflow groove; 19. Sensing plate; 20. Drainage opening; 21. Conductive support column; 22. Third overflow groove; 23. Sealing... 24. Sealing ring; 25. Top spring; 26. Compression ring; 27. Bottom spring; 28. Positioning ring; 29. ​​Adapter ring; 30. Inlay groove; 31. First connecting ring; 32. One-way valve; 33. Conductive contact; 34. Conductive ring; 35. Plug rod; 36. LED indicator; 37. Adapter seat; 38. Fixing ring; 39. Outer limiting ring; 40. Inner limiting ring; 41. Rotating sleeve; 42. Air vent; 43. Snap ring; 44. Connecting frame; 45. Battery holder; 46. Drive circuit board. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0041] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0042] like Figure 1 A shut-off valve with a leakage warning structure includes:

[0043] The valve body 1 has an inlet hole 2 and an outlet hole 3 at its bottom. A transition hole is vertically connected above the outlet hole 3. A stop hole 4 is coaxially arranged inside the transition hole. The inlet hole 2 and the outlet hole 3 are connected through the stop hole 4. The valve body 1 has a stop structure at its top. A valve cover 5 is fixed to the top of the valve body 1 corresponding to the transition hole by a flange. The stop mechanism includes a valve stem 6 threaded to the valve cover 5. A deflector ring 7 is fixedly connected to the top of the valve stem 6. A valve plug 8 is rotatably connected to the bottom of the valve stem 6. The front end of the valve plug 8 is in sealing contact with the stop hole 4 through a sealing ring 23.

[0044] And, a sensing component, which includes a water immersion sensing mechanism disposed at the rear end of the valve plug 8 corresponding to the seal and a water immersion display mechanism disposed within the valve plug 8;

[0045] In this design, an annular stop surface and an overflow surface are sequentially arranged on the inner wall of the stop hole 4 along the moving axis of the valve plug 8; a first partition ring 15 is provided at the front end of the valve plug 8, and a plurality of first overflow grooves 16 with axes parallel to the valve plug 8 are arranged in an annular array on the outer ring of the first partition ring 15; a sealing ring 23 is provided between the front end of the valve plug 8 and the first partition ring 15, and the sealing ring 23 is used to seal and contact the stop surface; a second partition ring 17 is provided at the end of the valve plug 8, and a plurality of second overflow grooves 18 with axes parallel to the valve plug 8 are arranged in an annular array on the outer ring of the second partition ring 17; an annular sensing groove is provided between the second partition ring 17 and the first partition ring 15, and the outer opening of the sensing groove is arranged corresponding to the overflow surface; the overflow surface will overflow the leaked water when the sealing ring 23 leaks.

[0046] like Figure 1 , Figure 2 and Figure 4 The immersion sensing mechanism includes several annular sensing plates 19 made of conductive material arranged in an array within a sensing groove. Several third overflow grooves 22 are arranged in an annular array around the outer ring of the sensing plates 19. Sensing gaps are provided between the sensing plates 19. Figure 4 The inner ring array of the sensing element 19 is provided with through holes and connecting holes arranged at intervals. An insulating ring is embedded in each through hole. Several drainage openings 20 are arranged in a ring array at the radial center of the sensing element 19. A connecting bracket is provided within the sensing groove. The connecting bracket includes several conductive support pillars 21 made of conductive material arranged in a ring array between the sensing grooves. Each conductive support pillar 21 includes a positive electrode support pillar and a negative electrode support pillar. The positive electrode support pillar is interference-fitted with the connecting holes of the odd-numbered sensing elements 19 and passes through the odd-numbered sensing elements 19. The through hole, the negative electrode support post and the connection hole of the even-numbered sensing element 19 are interference fit and fixed and pass through the through hole of the even-numbered sensing element 19. The conductive support post 21 is connected to the electrode of the corresponding water immersion display mechanism. When the sealing ring 23 is worn or the valve is not closed enough, the liquid coming in from the water inlet 2 will pass through the first overflow groove 16, the second overflow groove 18, the third overflow groove 22 and the drain opening 20 and enter between the sensing elements 19, so that the sensing elements 19 are in a conductive state and generate a certain resistance value according to the immersion humidity.

[0047] like Figure 5The water immersion display mechanism includes an operational controller. The voltage detection terminal of the operational controller, the water immersion sensing mechanism, and a first voltage divider resistor are connected in series to the drive circuit of the driving power supply. The voltage detection terminal of the operational controller can determine whether to output a level to turn on the display terminal's switching transistor based on the voltage value at this terminal. The voltage detection terminal can detect the water immersion status of the water immersion sensing mechanism by detecting the voltage change in the overall circuit caused by the change in the resistance of the water immersion sensing mechanism. The output terminal of the operational controller is connected to the switching transistor at the control terminal of the switching transistor. The display terminal of the water immersion display mechanism is connected in series to the drive circuit of the driving power supply via the switching transistor and a second voltage divider resistor. The second voltage divider resistor ensures that the LED indicator 35 of the display terminal is at a suitable operating voltage. Under normal conditions, the driving power supply outputs a constant current. When the water immersion display mechanism is not immersed in water, the voltage detection circuit... When the water immersion display mechanism is in the off state and leaks due to wear of the sealing ring 23, the voltage detection circuit is activated, causing the output of the operational controller to turn on the switching transistor. The first voltage divider resistor can be adjusted to change the reference voltage when the circuit is on. When the resistance between the sensing plates 19 of the water immersion display mechanism decreases infinitely, the circuit voltage will approach the reference voltage. Conversely, when the resistance between the sensing plates 19 increases, the circuit voltage will decrease and fall below the reference voltage. Based on this, the humidity threshold can be adjusted by selecting a suitable operational controller and the first voltage divider resistor. In addition, when the valve is open, the LED indicator 35 will also light up due to water immersion. Thus, the valve leakage or opening status can be clearly determined based on the valve's closed state and the status of the LED indicator 35.

[0048] like Figure 1 and Figure 2A pressure drive chamber 13 is provided in the middle of the valve plug 8. A one-way valve 31 with its opening direction facing the pressure drive chamber 13 is provided on the top of the valve plug 8. The front end of the valve stem 6 is rotatably sealed to the valve plug 8 through a rotary connector. A transmission hole is provided in the middle of the valve stem 6. A vent hole 41 is provided in the rotary connector. The transmission hole and the one-way valve 31 are connected through the vent hole 41. Several pressure relief holes are provided through the inner wall of the pressure drive chamber 13 and the inner wall of the sensing groove, connecting the pressure drive chamber 13 and the sensing groove. A transition ring 28 is provided on the top of the pressure drive chamber 13. The outer ring of the adapter ring 28 is in sealed contact with the inner wall of the pressure drive chamber 13. An annular groove 29 is provided within the adapter ring 28, and a plastic connecting frame 43 is provided within the groove 29. A battery holder 44 is located within the connecting frame 43. The battery and circuit board of the water immersion display mechanism are placed in the groove 29 via the connecting frame 43. Waterproof glue is injected into the connecting frame 43 to achieve a seal. The connecting wire of the water immersion sensing mechanism passes through the pressure relief hole and connects to the adapter ring 28. A first connecting ring 30 is provided in the middle of the adapter ring 28. The outer wall of the first connecting ring 30 is in sealed contact with the inner wall of the air vent 41. The connecting ring 28 is fixed and sealed by the seals on the outer side of the first connecting ring 28 and the outer side of the connecting ring 28, making the inlay groove 29 independent of the pressure flow path of the pressure driving cavity 13. Two sets of conductive contacts 32 are provided on the inner wall of the first connecting ring 30. The conductive contacts 32 are connected to the display end of the water immersion display mechanism through wires. A volume filling block 14 is also provided in the pressure driving cavity 13 below the connecting ring 28. The volume filling block 14 is made of a porous elastic material, and the wires can be fixed to the pressure driving cavity 13 through the volume filling block 14. When the valve changes from open to closed, the sensing element 19 will be soaked in water. By inputting air pressure at the end of the valve stem 6, the air pressure will enter the pressure drive chamber 13 through the transmission hole, air guide hole 41, and one-way valve 31. The pressure in the pressure drive chamber 13 will drain the water between the sensing elements 19 into the water outlet 3 through the pressure relief hole. At the same time, the constant pressure in the pressure drive chamber 13 can also prevent water from entering the top of the pressure drive chamber 13 when the valve is open and affecting the drive circuit board 45. Meanwhile, the volume filling block 14 can reduce the volume of the pressure drive chamber 13 and improve the pressure sensitivity.

[0049] like Figure 1A plug rod 34 is threadedly connected inside the transfer hole. The top of the plug rod 34 extends to the outside of the valve stem 6. An LED indicator 35 is installed at the top of the plug rod 34, and two sets of conductive rings 33 connected to the indicator lights are installed at the end of the plug rod 34. The conductive rings 33 are used to contact the conductive contacts 32 to realize the conductive connection between the display end and the LED indicator 35. After the valve is closed and pressurized, the plug rod 34 can be threaded in. The plug rod 34 can not only seal the transfer hole to prevent damage to the transfer hole, but also the LED indicator 35 at the end of the plug rod 34 can be connected to the driving power supply through the conductive contacts 32 and the conductive rings 33. When the valve leaks, the LED indicator 35 can light up at the top of the valve, which is convenient for timely observation and maintenance.

[0050] like Figure 1 An adapter seat 36 is fixed to the top of the valve plug 8. The rotating connector includes a fixed ring 37 fixed to the adapter seat 36 and a rotating sleeve 40 rotatably connected to the fixed ring 37. A stepped hole is provided at the top of the fixed ring 37, and a stepped surface that fits the stepped hole at the front end of the valve stem 6 is provided. An air guide hole 41 is provided at the end of the fixed ring 37 and communicates with the end of the stepped hole. A retaining ring 42 is also provided at the front end of the valve stem 6 and makes a limiting contact with the bottom of the air guide hole 41. An inner limiting ring 39 is provided at the connection position of the valve stem 6 corresponding to the rotating sleeve 40. The inner ring of the rotating sleeve 40 is sleeved on the outside of the valve stem 6 and makes a limiting contact with the limiting ring. An outer limiting ring 38 is provided on the outer ring of the fixed ring 37. The inner wall of the rotating sleeve 40 makes a sliding sealing contact with the outer wall of the fixed ring 37, and the front end of the rotating sleeve 40 makes a sliding sealing contact with the end of the outer limiting ring 38.

[0051] like Figure 1 and Figure 2 A limiting ring 9 is fixed below the valve plug 8 by a thread. A second connecting ring 10 is provided at the top of the inner ring of the limiting ring 9. The second connecting ring 10 is threadedly connected to the inner wall of the pressure driving chamber 13. A second separating ring 17 is sleeved and fixed to the outer ring of the second connecting ring 10. The pressure relief hole includes pressure relief connecting holes 11 arranged in an array on the second connecting ring 10. The pressure relief hole also includes a plurality of pressure relief grooves 12 arranged in an annular array at the bottom of the inner wall of the pressure driving chamber 13. The bottom of the pressure relief groove 12 is provided with a pressure relief opening connected to the pressure relief connecting hole. The top of the pressure relief groove 12 has a gradually expanding structure and opens at the bottom of the sensing groove. When the second connecting ring 10 is combined with the pressure driving chamber 13, the pressure relief opening with a larger opening area will be connected to a larger number of pressure relief connecting holes 11. The wire connected to the conductive support column 21 can pass through the pressure relief connecting hole 11 and the pressure relief groove 12 and be connected to the drive circuit board 45 in the adapter ring 28.

[0052] like Figure 1 and Figure 3A sealing ring 23 is located at the bottom of the limiting ring 9. The sealing ring 23 includes a contact portion on the annular outer wall of the limiting ring 9 and a limiting portion at the bottom of the limiting ring 9. Annular protruding positioning rings 27 are provided on both the side wall and the bottom of the limiting ring 9. A positioning groove corresponding to the positioning ring 27 is provided inside the sealing ring 23. The cooperation between the positioning ring 27 and the positioning groove prevents the sealing ring 23 from separating from the limiting ring 9. A compression ring 25 is connected to the bottom of the limiting ring 9 via a flange. The pressure driving chamber 13 is open at the connection position of the compression ring 25, facilitating the opening of the compression ring 25 to achieve pressure control. The pressure drive chamber 13 is cleaned. The outer ring of the compression ring 25 is fixed with a bottom spring 26 by the compression ring limit. The limiting part of the sealing ring 23 is in limiting contact with the bottom spring 26. A top spring 24 is provided inside the second separating ring 17. The top spring 24 is in contact with the top of the contact part. A bending structure is also provided on the outer ring of the top spring 24 and embedded in the top of the contact part of the sealing ring 23. By bidirectionally compressing the top and bottom of the sealing ring 23, it can be ensured that the sealing ring 23 will not deform or separate in the axial direction due to friction during the up and down reciprocating movement.

[0053] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A stop valve provided with a leakage warning structure, comprising: a valve shell (1) having a water inlet hole (2) and a water outlet hole (3) at the bottom, and a stop hole (4) connecting the water inlet hole (2) and the water outlet hole (3); a stop structure is arranged at the top of the valve shell (1), which comprises a valve stem (6) threadedly connected with the valve shell (1), and a valve plug (8) rotatably connected with the end of the valve stem (6), and the front end of the valve plug (8) is in sealing contact with the stop hole (4) through a sealing ring (23); characterized in that it further comprises: a sensing assembly, which comprises a water immersion sensing mechanism arranged at the position corresponding to the rear end of the sealing member of the valve plug (8), and a water immersion display mechanism arranged in the valve plug (8); wherein an annular stop surface and an overflow surface are sequentially arranged on the inner wall of the stop hole (4) along the moving axis of the valve plug (8); wherein a first partition ring (15) is arranged at the front end of the valve plug (8), and a plurality of first overflow grooves (16) with axes parallel to the valve plug (8) are annularly arranged on the outer ring of the first partition ring (15); a sealing ring (23) is arranged between the front end of the valve plug (8) and the first partition ring (15), and is used for sealing contact with the stop surface; a second partition ring (17) is arranged at the end of the valve plug (8), and a plurality of second overflow grooves (18) with axes parallel to the valve plug (8) are annularly arranged on the outer ring of the second partition ring (17); an annular sensing groove is arranged between the second partition ring (17) and the first partition ring (15), and the outer ring opening of the sensing groove is correspondingly arranged with the overflow surface; the water immersion sensing mechanism comprises a plurality of annular sensing pieces (19) made of conductive material and arranged in the sensing groove, and an insulating gap is arranged between the sensing pieces (19); the odd-numbered sensing pieces (19) and the even-numbered sensing pieces (19) are respectively connected to two electrodes of the water immersion display mechanism; a plurality of third overflow grooves (22) are annularly arranged on the outer ring of the sensing pieces (19); the water immersion display mechanism comprises an operation controller, the voltage detection end of the operation controller is connected in series with the water immersion sensing mechanism to the driving circuit of the driving power supply, the output end of the operation controller is connected to the control end of the switching tube, and the display end of the water immersion display mechanism is connected in series with the switching tube to the driving circuit of the driving power supply.

2. A stop valve provided with a leakage warning structure according to claim 1, characterized in that: the inner ring of the sensing piece (19) is annularly arranged with through holes and connecting holes arranged at intervals, and the through holes are inlaid with insulating rings; a connecting support is arranged in the sensing groove, and the connecting support comprises a plurality of conductive support columns (21) made of conductive material and arranged in the sensing groove in an annular array, the conductive support column (21) comprises a positive support column and a negative support column, the positive support column is fixedly connected with the connecting hole of the odd-numbered sensing piece (19) in an interference fit and passes through the through hole of the odd-numbered sensing piece (19), and the negative support column is fixedly connected with the connecting hole of the even-numbered sensing piece (19) in an interference fit and passes through the through hole of the even-numbered sensing piece (19); the conductive support column (21) is connected to the corresponding electrode.

3. A stop valve provided with a leakage warning structure according to claim 2, characterized in that: insulating spacer rings coaxial with the conductive support column (21) are arranged between adjacent sensing pieces (19).

4. A stop valve provided with a leakage warning structure according to claim 1, characterized in that: The valve plug (8) is provided with a pressure driving cavity (13) in the middle part, and a one-way valve (31) is arranged on the top of the valve plug (8) and faces the pressure driving cavity (13), the front end of the valve rod (6) is rotatably connected with the valve plug (8) through a rotating connector, a transmission hole is arranged in the middle part of the valve rod (6), a gas guide hole (41) is arranged in the rotating connector, and the transmission hole is connected with the one-way valve (31) through the gas guide hole (41); a plurality of pressure relief holes are arranged between the inner wall of the pressure driving cavity (13) and the inner wall of the induction groove and communicate the pressure driving cavity (13) and the induction groove.

5. A stop valve provided with a leakage warning structure according to claim 4, characterized in that: The rotating connector is provided with an adapter ring (28) on the top of the pressure driving cavity (13), the outer ring of the adapter ring (28) is in sealing contact with the inner wall of the pressure driving cavity (13), an annular inlay groove (29) is arranged in the adapter ring (28), the water immersion display mechanism is arranged in the inlay groove (29), and the connecting line of the water immersion induction mechanism passes through the pressure relief hole and is connected to the adapter ring (28).

6. A stop valve provided with a leakage warning structure according to claim 5, characterized in that: A first connecting ring (30) is arranged in the middle part of the adapter ring (28), the outer wall of the first connecting ring (30) is in sealing contact with the inner wall of the gas guide hole (41), two groups of conductive contacts (32) are arranged on the inner wall of the first connecting ring (30), the conductive contacts (32) are connected to the display end of the water immersion display mechanism through wires, a plug rod (34) is threadedly connected in the transmission hole, the top end of the plug rod (34) extends to the outside of the valve rod (6), an LED indicator lamp (35) is arranged on the top end of the plug rod (34), two groups of conductive rings (33) connected with the indicator lamp are arranged at the end of the plug rod (34), and the conductive rings (33) are used for contacting the conductive contacts (32) to realize the conductive connection between the display end and the LED indicator lamp (35).

7. A stop valve provided with a leakage warning structure according to claim 4, characterized in that: A rotating connector is arranged on the top of the valve plug (8), the rotating connector includes a fixed ring (37) fixed to the adapter seat (36) and a rotating sleeve (40) rotatably connected with the fixed ring (37), a stepped hole is arranged on the top end of the fixed ring (37), a stepped surface is arranged on the front end of the valve rod (6) and matches the stepped hole in a clearance fit, the gas guide hole (41) is arranged at the end of the fixed ring (37) and communicates with the end of the stepped hole, a circlip (42) is further arranged on the front end of the valve rod (6) and is in limiting contact with the bottom of the gas guide hole (41), an inner limiting ring (39) is arranged at the connecting position of the valve rod (6) corresponding to the rotating sleeve (40), the inner ring of the rotating sleeve (40) is sleeved on the outside of the valve rod (6) and is in limiting contact with the limiting ring, an outer limiting ring (38) is arranged on the outer ring of the fixed ring (37), the inner wall of the rotating sleeve (40) is in sliding sealing contact with the outer wall of the fixed ring (37), and the front end of the rotating sleeve (40) is in sliding sealing contact with the end of the outer limiting ring (38).

8. A stop valve provided with a leakage warning structure according to claim 4, characterized in that: A limiting ring (9) is fixed below the valve plug (8) by screwing, the inner ring top of the limiting ring (9) is provided with a second connecting ring (10), the second connecting ring (10) is threadedly connected with the inner wall of the pressure driving cavity (13), the second separating ring (17) is sleeved and fixed to the outer ring of the second connecting ring (10); the pressure relief hole includes pressure relief connecting holes (11) arranged in an array on the second connecting ring (10), the pressure relief hole further includes a plurality of pressure relief grooves (12) arranged in an annular array at the bottom of the inner wall of the pressure driving cavity (13), the bottom of the pressure relief groove (12) is provided with a pressure relief opening connected with the pressure relief connecting hole, and the top of the pressure relief groove (12) is of a gradually expanding structure and is provided with an inductive groove bottom opening.

9. A stop valve provided with a leakage warning structure according to claim 8, characterized in that: A sealing ring (23) is arranged at the bottom of the limiting ring (9), the sealing ring (23) includes a contact portion arranged on the annular outer side wall of the limiting ring (9) and a limiting portion arranged at the bottom of the limiting ring (9), a pressing ring (25) is linked to the bottom of the limiting ring (9) through a flange, the outer ring of the pressing ring (25) is fixed with a bottom spring piece (26) through pressing ring limiting, the limiting portion of the sealing ring (23) is in limiting contact with the bottom spring piece (26), and a top spring piece (24) is arranged in the second separating ring (17), and the top of the contact portion is in contact with the top spring piece (24).

10. A stop valve provided with a leakage warning structure according to claim 4, characterized in that: A volume filling block (14) is further arranged in the pressure driving cavity (13), and the volume filling block (14) is made of porous material.

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