A stop valve based on self-checking of tightness

Abstract

The application discloses a kind of based on sealing self-checking stop valve, it is related to stop valve technical field.The application utilizes the displacement when lower valve flap closes, automatically opens sealing test groove, and the leakage liquid is guided and collected, is driven detection ring by leakage liquid and moves upwards, to drive detection block extrusion transmission block, finally triggers piezoelectric crystal, converts leakage physical quantity into quantifiable electric signal, realizes the purpose of sealing self-checking.Utilize the design that valve flap assembly opens, lower valve flap automatically rebounds, drives drainage ring and sealing test groove inlay, extrudes the leakage liquid in sealing test groove, reaches the effect of drainage.Utilize the pressure when valve flap assembly closes, make lower valve flap and upper valve flap close, extrude airbag ring, airbag ring generates one-way expansion and carries out secondary sealing to intercepting port, in combination with the primary seal between upper valve flap and lower valve flap and intercepting port, realize the effect of multiple sealing to intercepting port.

Description

Technical Field

[0001] The invention relates to the technical field of stop valves, in particular to a stop valve based on sealing self-inspection. Background Art

[0002] A globe valve is a valve device that uses vertical movement of the disc to achieve opening and closing control. Its core function is to regulate or cut off the flow of media within a pipeline. In fields such as petrochemicals, power systems, water supply and drainage engineering, and HVAC, globe valves, with their reliable sealing structure and stable operating performance, can not only achieve precise flow control, but also quickly cut off media transmission during equipment maintenance or emergencies, effectively preventing safety hazards such as media backflow and pressure loss. Its low-inlet, high-outlet flow design significantly reduces opening and closing torque. Combined with the use of high-temperature and high-pressure resistant materials, it has become a key control component to ensure the safe operation of industrial systems and extend the service life of pipelines.

[0003] However, globe valves still suffer from numerous technical deficiencies. The shutoff port of a globe valve can easily accumulate impurities such as scale and rust over time. When the valve disc closes, it rubs against these impurities, causing wear and tear on the disc and reducing its sealing performance. In pipelines with large flow fluctuations, the disc can often leak due to sudden impacts. Furthermore, existing globe valves lack effective self-testing for leaks. Summary of the Invention

[0004] The object of the present invention is to provide a stop valve based on sealing self-inspection to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a stop valve based on sealing self-inspection, comprising a valve body and a valve stem, a valve cover mounted on the valve body, a bracket mounted on the valve cover, a handwheel rotatably mounted on the bracket, the top end of the valve stem passes through the bracket and is threadedly connected to the handwheel, the valve stem is slidably connected to the valve body, a valve disc assembly is mounted on the bottom end of the valve stem, and a protective assembly is slidably mounted within the valve body; a shut-off port is provided within the valve body, and the protective assembly is slidably mounted at the shut-off port.

[0006] An inlet and an outlet are respectively provided at both ends of the valve body, both of which are connected to fluid pipelines. An S-shaped flow channel is provided in the valve body, and the shut-off port is located in the middle of the S-shaped flow channel. By turning the handle, the valve stem is driven to slide on the valve body, and the valve stem drives the valve disc assembly to move in the valve body. When the valve disc assembly is engaged with the shut-off port, the closing operation of the stop valve is completed.

[0007] Furthermore, the valve flap assembly includes an upper valve flap, which is installed at the bottom end of the valve stem, and a lower valve flap is slidably installed on the upper valve flap, a sealing spring is installed between the upper valve flap and the lower valve flap, an airbag ring is installed between the upper valve flap and the lower valve flap, and a sealing detection assembly is installed in the upper valve flap.

[0008] Furthermore, a sealing measuring groove is provided on the upper valve disc, and the side of the sealing measuring groove close to the valve body is sloped. A side retaining ring is provided on the upper valve disc, and an upper wing ring is provided on the upper valve disc, which is connected to the top of the airbag ring.

[0009] When the valve core assembly is closed, the top of the upper ring wing is flush with the top of the orifice.

[0010] Furthermore, the lower valve disc includes a bottom plate, the bottom end of the bottom plate is provided with a beveled surface, a number of connecting rods are installed on the lower valve disc, the top end of the connecting rod passes through the upper valve disc and is provided with a drain ring, the drain ring is embedded in the sealing measurement groove, an extrusion groove is provided on the bottom plate, the side retaining ring is embedded in the extrusion groove, a lower wing ring is provided on the bottom plate, the lower wing ring is connected to the bottom end of the airbag ring, a sealing spring is installed between the bottom plate and the upper valve disc, and the sealing detection assembly is located at the bottom end of the drain ring.

[0011] When the disc assembly needs to close, the valve stem drives the upper disc to move, which in turn drives the entire disc assembly. As the disc assembly approaches the orifice, the chamfered surface on the lower disc first contacts and engages with the annular chamfered head. The lower disc then presses down on the annular chamfered head until it resets and cannot move. As the disc assembly descends further, the lower disc is blocked by the annular chamfered head and cannot continue to descend. Relative displacement occurs between the upper and lower discs, bringing them closer together. The sealing spring is compressed, and the upper and lower end faces of the airbag ring are squeezed by the upper and lower ring wings, respectively. The airbag ring begins to expand to both sides. Because the limiting surface on one side of the airbag ring is blocked by the side retaining ring, the expansion surface of the airbag ring expands toward the orifice, sealing the orifice and achieving the purpose of secondary sealing. Subsequently, the handwheel stops turning, and the upper and lower discs engage with the orifice, forming a primary seal on the orifice, ultimately achieving a multi-sealing effect on the orifice.

[0012] When the flow accumulated at the inlet of the valve body is large and the valve disc assembly is subjected to greater pressure, the upper valve disc is held against the valve stem and cannot move, and the compressed lower valve disc is slightly displaced upward, and the lower valve disc is close to the lower valve disc, so that the airbag ring is further compressed, and the expansion surface of the airbag ring is further expanded, fitting more tightly with the intercepting port, making the sealing stronger; when the stop valve is suddenly closed or the inlet flow changes suddenly, the valve disc assembly in the closed state converts part of the impact force into the displacement of the lower valve disc and the compression of the blocking spring, thereby achieving the purpose of absorbing and dissolving this part of the impact force, reducing the impact force on the valve disc assembly, and converting the other part of the impact into unilateral expansion of the airbag ring, thereby improving the sealing performance of the valve disc assembly under sudden impact.

[0013] Furthermore, the sealing detection assembly includes a detection ring, an elastic diaphragm and a transmission block. The detection ring is engaged with the sealing measurement groove. The detection ring is located at the bottom end of the drainage ring. The detection ring is made of low-density material. A detection rod is installed at the bottom end of the detection ring. A detection block is installed at the bottom end of the detection rod. The detection rod is slidingly connected to the upper valve disc, the detection block is slidingly connected to the upper valve disc, the transmission block is slidingly connected to the upper valve disc, a contact is provided on one side of the transmission block, the elastic diaphragm is installed in the upper valve disc, a piezoelectric crystal is installed in the elastic diaphragm, a first inclined surface is provided on the detection block, a second inclined surface is provided on the transmission block, the first inclined surface is slidingly connected to the second inclined surface, and the contact is aligned with the center axis of the piezoelectric crystal.

[0014] The transmission block is connected to the upper disc in a horizontal sliding manner, while the detection block is connected to the upper disc in a vertical sliding manner. The detection ring is made of a lightweight material with a lower density than the fluid. When the disc assembly is not closed, the drain ring engages with the sealing groove.

[0015] In the closed state of the valve disc assembly, since the lower valve disc and the upper valve disc are close to each other, the drain ring is separated from the sealing measuring groove, and the sealing measuring groove is in the open state. When leakage occurs between the valve disc assembly and the intercepting port, the leakage liquid flows upward from the gap between the valve disc assembly and the intercepting port, and part of the leakage liquid flows into the sealing measuring groove from the top of the upper wing ring. The detection ring at the bottom of the sealing groove floats up under the buoyancy of the leakage liquid. The detection ring drives the detection block to move upward through the detection rod at the bottom. The first inclined surface of the detection block squeezes the second inclined surface of the transmission block, and the transmission block produces horizontal displacement and drives the contact to squeeze the piezoelectric crystal in the elastic diaphragm. The greater the leakage, the greater the floating distance of the detection ring, and the greater the pressure on the piezoelectric crystal. The piezoelectric crystal generates an electrical signal of corresponding strength according to the degree of pressure. After receiving the electrical signal, the external control system judges the degree of leakage according to the strength of the electrical signal. When the leakage degree exceeds the preset value, a maintenance reminder is issued to the staff, thereby achieving the purpose of sealing self-inspection.

[0016] When the valve disc assembly is opened, the sealing spring rebounds and drives the lower valve disc to reset, and the drain ring is engaged with the sealing groove again. During the engagement process, the drain ring squeezes out the leakage liquid in the sealing groove to achieve the drainage effect, so that the sealing detection assembly is closed and reset.

[0017] Furthermore, the airbag ring is provided with an upper end face and a lower end face, the upper end face is connected to the upper wing ring, and the lower end face is connected to the lower wing ring. The airbag ring is provided with a limiting surface, which is in contact with the side retaining ring. The airbag ring is provided with an expansion surface, which is located on the side close to the intercepting port, and the airbag ring is filled with a medium.

[0018] The airbag ring is made of high-strength elastic material.

[0019] Furthermore, the protective component includes a slip ring, which is slidably connected to the cutoff port, a plurality of sliders are provided on the slip ring, a plurality of inclined slots are provided at the cutoff port, the sliders are slidably connected to the inclined slots, a reciprocating spring is installed between the sliders and the inclined slots, a drive ring is installed in the slip ring, and an annular bevel head is provided at the top of the slip ring.

[0020] When the globe valve is open, fluid enters the S-shaped flow channel within the valve body from the pipeline, passes through the protective assembly at the shutoff port, and exits the pipeline at the other end. As the fluid passes through the protective assembly, the drive ring is impacted by the fluid, causing it to move upward along the path of the inclined slot, driven by the sliding head and the inclined slot. This compresses the reciprocating spring, and during this process, the annular bevel head on the slip ring scrapes away impurities such as scale and rust adhering to the inner wall of the shutoff port. The greater the fluid impact, the greater the compression of the reciprocating spring, the greater the rotational displacement of the slip ring, and the more pronounced the scraping effect of the annular bevel head driven by the slip ring. As the fluid flow fluctuates, the annular bevel head reciprocates at the shutoff port, continuously cleaning the shutoff port and keeping it clean. This prevents impurities from scratching the disc assembly when it engages with the shutoff port, potentially affecting its sealing and service life. Furthermore, the jerky motion of the annular bevel head during this reciprocating movement prevents impurities from adhering to the ring, achieving a self-cleaning effect.

[0021] Furthermore, a limiting slide is provided on the valve stem, which is slidably connected to the bracket and the valve body. An adjusting thread is provided on the valve stem, which is threadably connected to the handwheel through the adjusting thread.

[0022] The limit slide is used to limit the rotation of the valve stem. When the handwheel is turned, the valve stem is driven to slide up and down by adjusting the thread, and the valve stem drives the valve disc assembly to move up and down. When the valve disc assembly is tightly fitted with the intercepting port, the flow is stopped.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The downward pressure when the valve disc assembly is closed is used to bring the lower valve disc and the upper valve disc closer together, squeezing the airbag ring. The airbag ring generates unidirectional expansion to perform secondary sealing on the intercepting port. Combined with the primary sealing between the upper and lower valve discs and the intercepting port, the multiple sealing effects of the intercepting port are achieved, which improves the sealing reliability and makes up for the shortcomings of the traditional single-layer seal.

[0025] 2. When the valve inlet pressure increases, the lower disc is pressed upward, further compressing the airbag ring, making the expansion surface fit more closely with the interception port, achieving a sealing effect where the sealing strength increases adaptively with pressure. When a sudden flow shock occurs, the displacement of the lower disc and the compression of the blocking spring work together to absorb the impact energy and convert it into reversible mechanical deformation, reducing the impact force on the disc assembly and improving the sealing performance of the disc assembly under sudden shock.

[0026] 3. The displacement of the lower disc when closed automatically opens the sealing test groove. The slope of the sealing test groove guides and collects the leaking liquid. The leaking liquid drives the detection ring upward, which causes the detection block to squeeze the transmission block, ultimately triggering the piezoelectric crystal, converting the physical leakage quantity into a quantifiable electrical signal, achieving the purpose of sealing self-test. When the disc assembly opens, the lower disc automatically rebounds, driving the drainage ring to engage with the sealing test groove, squeezing out the leaking liquid in the sealing test groove, achieving the drainage effect, and closing and resetting the sealing detection assembly.

[0027] 4. The kinetic energy of the fluid is used to drive the slip ring to rotate and move upward. The linear impact is converted into the spiral scraping motion of the annular bevel head through the cooperation of the inclined groove and the sliding head. The annular bevel head rotates back and forth at the intercepting port position as the fluid flow fluctuates, continuously cleaning the intercepting port to keep it clean and avoid being scratched by impurities in the intercepting port when the valve disc assembly is fitted with the intercepting port, which affects the sealing performance and service life. The bumps generated by the annular bevel head during the reciprocating displacement process achieve the purpose of self-cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall three-dimensional diagram of the stop valve of the present invention;

[0029] Figure 2 A perspective view of a stop valve according to the present invention;

[0030] Figure 3 is a perspective view of the protective assembly of the present invention;

[0031] Figure 4 is a three-dimensional diagram of the valve body of the present invention;

[0032] Figure 5 A perspective view of the valve flap assembly of the present invention;

[0033] Figure 6 A three-dimensional diagram of the upper valve disc of the present invention;

[0034] Figure 7 A three-dimensional diagram of the lower valve disc of the present invention;

[0035] Figure 8 For the present invention Figure 5 A partial enlarged view of area A in the middle;

[0036] Figure 9 is a three-dimensional diagram of the airbag ring of the present invention;

[0037] Figure 10 It is a three-dimensional diagram of the sealing detection component of the present invention.

[0038] Figure: 1, valve body; 2, valve cover; 3, valve disc assembly; 4, valve stem; 5, handwheel; 6, protective assembly; 7, bracket; 61, slider; 62, reciprocating spring; 63, slip ring; 64, drive ring; 65, annular bevel head; 11, intercepting port; 12, inclined slide; 41, limit slide; 31, upper valve disc; 32, blocking spring; 33, airbag ring; 34, lower valve disc; 35, sealing detection assembly; 311, side retaining ring; 31 2. Sealing measuring groove; 313. Upper wing ring; 341. Bottom plate; 342. Connecting rod; 343. Beveled surface; 344. Extrusion groove; 345. Drain ring; 346. Lower wing ring; 351. Detection ring; 352. Detection rod; 353. Detection block; 354. Transmission block; 355. Contact; 356. Piezoelectric crystal; 357. Elastic diaphragm; 331. Limiting surface; 332. Expansion surface; 333. Upper end surface; 334. Lower end surface. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] like Figures 1-10 As shown, the present invention provides a technical solution for a stop valve based on sealing self-inspection: it includes a valve body 1 and a valve stem 4, a valve cover 2 is installed on the valve body 1, a bracket 7 is installed on the valve cover 2, a handwheel 5 is rotatably installed on the bracket 7, the top of the valve stem 4 passes through the bracket 7 and is threadedly connected to the handwheel 5, the valve stem 4 is slidably connected to the valve body 1, a valve disc assembly 3 is installed at the bottom end of the valve stem 4, and a protective assembly 6 is slidably installed in the valve body 1; a shutoff port 11 is provided in the valve body 1, and the protective assembly 6 is slidably installed at the shutoff port 11.

[0041] An inlet and an outlet are respectively provided at both ends of the valve body 1, and both the inlet and the outlet are connected to fluid pipelines. An S-shaped flow channel is provided in the valve body 1, and the shut-off port 11 is located in the middle position of the S-shaped flow channel; by rotating the handle, the valve stem 4 is driven to slide on the valve body 1, and the valve stem 4 drives the valve flap assembly 3 to move in the valve body 1. When the valve flap assembly 3 is engaged with the shut-off port 11, the closing operation of the stop valve is completed.

[0042] A limiting slide 41 is provided on the valve stem 4, and the limiting slide 41 is slidably connected to the bracket 7 and the valve body 1. An adjusting thread is provided on the valve stem 4, and the valve stem 4 is threadedly connected to the hand wheel 5 through the adjusting thread.

[0043] The limiting slide 41 is used to limit the rotation of the valve stem 4. When the handwheel 5 is rotated, the valve stem 4 is driven to slide up and down by adjusting the thread, and the valve stem 4 drives the valve flap assembly 3 to move up and down. When the valve flap assembly 3 is tightly fitted with the intercepting port 11, the flow is stopped.

[0044] The protective assembly 6 includes a slip ring 63, which is slidably connected to the intercepting port 11. A plurality of sliders 61 are provided on the slip ring 63. The intercepting port 11 is provided with a plurality of inclined slots 12. The sliders 61 are slidably connected to the inclined slots 12. A reciprocating spring 62 is installed between the slider 61 and the inclined slots 12. A drive ring 64 is installed in the slip ring 63. An annular bevel head 65 is provided at the top of the slip ring 63.

[0045] The valve flap assembly 3 includes an upper valve flap 31, which is installed at the bottom end of the valve stem 4. A lower valve flap 34 is slidably installed on the upper valve flap 31, a sealing spring 32 is installed between the upper valve flap 31 and the lower valve flap 34, an airbag ring 33 is installed between the upper valve flap 31 and the lower valve flap 34, and a sealing detection assembly 35 is installed in the upper valve flap 31.

[0046] The upper valve disc 31 is provided with a sealing groove 312, which is sloped on the side closest to the valve body 1. The upper valve disc 31 is also provided with a side retaining ring 311 and an upper wing ring 313, which is connected to the top of the airbag ring 33. When the valve core assembly is closed, the top of the upper wing ring is flush with the top of the intercepting port 11.

[0047] The lower valve disc 34 includes a bottom plate 341, and a beveled surface 343 is provided at the bottom end of the bottom plate 341. A number of connecting rods 342 are installed on the lower valve disc 34. The top end of the connecting rod 342 passes through the upper valve disc 31 and is installed with a drainage ring 345. The drainage ring 345 is embedded in the sealing measurement groove 312. An extrusion groove 344 is provided on the bottom plate 341, and the side retaining ring 311 is embedded in the extrusion groove 344. A lower wing ring 346 is provided on the bottom plate 341, and the lower wing ring 346 is connected to the bottom end of the airbag ring 33. A sealing spring 32 is installed between the bottom plate 341 and the upper valve disc 31, and the sealing detection component 35 is located at the bottom end of the drainage ring 345.

[0048] The sealing detection assembly 35 includes a detection ring 351, an elastic diaphragm 357 and a transmission block 354. The detection ring 351 is engaged with the sealing measurement groove 312. The detection ring 351 is located at the bottom end of the drain ring 345. The detection ring 351 is made of low-density material. A detection rod 352 is installed at the bottom end of the detection ring 351, and a detection block 353 is installed at the bottom end of the detection rod 352. The detection rod 352 is slidably connected to the upper valve disc 31, the detection block 353 is slidably connected to the upper valve disc 31, and the transmission block 354 is slidably connected to the upper valve disc 31. A contact 355 is provided on one side of the transmission block 354, the elastic diaphragm 357 is installed in the upper valve disc 31, and a piezoelectric crystal 356 is installed in the elastic diaphragm 357. A first inclined surface is provided on the detection block 353, and a second inclined surface is provided on the transmission block 354. The first inclined surface and the second inclined surface are slidably connected, and the contact 355 is aligned with the central axis of the piezoelectric crystal 356.

[0049] The transmission block 354 is horizontally slidably connected to the upper valve disc 31, while the detection block 353 is vertically slidably connected to the upper valve disc 31. The detection ring 351 is made of a lightweight material with a lower density than the fluid. When the valve disc assembly 3 is not closed, the drain ring 345 is engaged with the sealing groove 312.

[0050] The airbag ring 33 has an upper end surface 333 and a lower end surface 334. The upper end surface 333 is connected to the upper wing ring 313, and the lower end surface 334 is connected to the lower wing ring 346. The airbag ring 33 has a limiting surface 331, which is in contact with the side retaining ring 311. The airbag ring 33 has an expansion surface 332, which is located on the side near the intercepting port 11. The airbag ring 33 is filled with a medium. The airbag ring 33 is made of a high-strength elastic material.

[0051] The working principle of the present invention is as follows: when the stop valve is in the open state, the fluid enters the S-shaped flow channel in the valve body 1 from the pipeline, passes through the protection component 6 at the intercepting port 11, and flows out from the pipeline at the other end. When the fluid passes through the protective assembly 6, the driving ring 64 is impacted by the fluid and drives the slip ring 63 to move. Under the cooperation of the slider 61 and the inclined slide groove 12, the slip ring 63 rotates and moves upward along the path of the inclined slide groove 12, and the reciprocating spring 62 is compressed. During this process, the annular bevel head 65 on the slip ring 63 scrapes the scale, rust and other impurities attached to the inner wall of the intercepting port 11. The greater the fluid impact, the greater the compression of the reciprocating spring 62, the greater the rotational displacement of the slip ring 63, and the more obvious the scraping effect of the annular bevel head 65 driven by the slip ring 63. As the fluid flow fluctuates, the annular bevel head 65 reciprocates and displaces at the position of the intercepting port 11, continuously cleaning the intercepting port 11, keeping the intercepting port 11 clean, and avoiding being scratched by impurities in the intercepting port 11 when the valve disc assembly 3 is engaged with the intercepting port 11, thereby affecting the sealing and service life; and the bumpy effect generated by the annular bevel head 65 during the reciprocating displacement makes it difficult for impurities to adhere to itself, thereby achieving the purpose of self-cleaning.

[0052] When the valve disc assembly 3 needs to be closed, the valve stem 4 drives the upper valve disc 31 to move, and the upper valve disc 31 drives the entire valve disc assembly 3 to move. As the valve disc assembly 3 approaches the intercepting port 11, the beveled surface 343 on the lower valve disc 34 first contacts and engages with the annular beveled head 65, and the lower valve disc 34 presses down the annular beveled head 65 until the annular beveled head 65 is reset and cannot move. Then, as the valve disc assembly 3 further descends, the lower valve disc 34 is blocked by the annular beveled head 65 and cannot continue to descend. When the hand wheel 5 is stopped, the upper and lower valve discs 31 and 34 are moved relative to each other, and the sealing spring 32 is compressed. The upper and lower end surfaces 333 and 334 of the airbag ring 33 are squeezed by the upper and lower ring wings respectively, and the airbag ring 33 begins to expand to both sides. Because the limiting surface 331 on one side of the airbag ring 33 is blocked by the side retaining ring 311, the expansion surface 332 of the airbag ring 33 expands toward the intercepting port 11, blocking the intercepting port 11 and achieving the purpose of secondary sealing. Subsequently, the hand wheel 5 is stopped, and the upper and lower valve discs 31 and 34 are engaged with the intercepting port 11, forming a primary seal for the intercepting port 11, and finally achieving a multiple sealing effect for the intercepting port 11.

[0053] When the flow accumulated at the inlet of the valve body 1 is large, and the valve flap assembly 3 is subjected to a large pressure, the upper valve flap 31 is held by the valve stem 4 and cannot move, and the compressed lower valve flap 34 is slightly displaced upward, and the lower valve flap 34 and the lower valve flap 34 are close to each other, so that the airbag ring 33 is further compressed, and the expansion surface 332 of the airbag ring 33 is further expanded, fitting more tightly with the intercepting port 11, making the sealing stronger; when the stop valve is suddenly closed or the inlet flow suddenly changes, the valve flap assembly 3 in the closed state converts part of the impact force into the displacement of the lower valve flap 34 and the compression of the blocking spring 32, thereby achieving the purpose of absorbing and dissolving this part of the impact force, reducing the impact force on the valve flap assembly 3, and converting the other part of the impact into unilateral expansion of the airbag ring 33, thereby improving the sealing performance of the valve flap assembly 3 under sudden impact.

[0054] In the closed state of the valve disc assembly 3, since the lower valve disc 34 and the upper valve disc 31 are close to each other, the drainage ring 345 is separated from the sealing groove 312, and the sealing groove 312 is in the open state. When leakage occurs between the valve disc assembly 3 and the intercepting port 11, the leakage liquid flows upward from the gap between the valve disc assembly 3 and the intercepting port 11, and part of the leakage liquid flows into the sealing groove 312 from the top of the upper wing ring 313. The detection ring 351 at the bottom of the sealing groove floats up under the buoyancy of the leakage liquid, and the detection ring 351 drives the detection block 353 to move upward through the detection rod 352 at the bottom. The detection block 353 The first inclined surface of the transmission block 354 is squeezed, and the transmission block 354 produces horizontal displacement, and drives the contact 355 to squeeze the piezoelectric crystal 356 in the elastic diaphragm 357. The greater the leakage, the greater the floating distance of the detection ring 351, and the greater the pressure on the piezoelectric crystal 356. The piezoelectric crystal 356 generates an electrical signal of corresponding intensity according to the degree of pressure. After receiving the electrical signal, the external control system determines the degree of leakage according to the strength of the electrical signal. When the leakage degree exceeds the preset value, a maintenance reminder is issued to the staff, thereby achieving the purpose of sealing self-inspection.

[0055] When the valve disc assembly 3 is opened, the blocking spring 32 rebounds and drives the lower valve disc 34 to reset, and the drainage ring 345 is again engaged with the sealing groove 312. During the engagement process, the drainage ring 345 squeezes out the leaked liquid in the sealing groove 312 to achieve the drainage effect, so that the sealing detection assembly 35 is closed and reset.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A stop valve based on sealing self-test, characterized by: The stop valve comprises a valve body (1) and a valve stem (4); a valve cover (2) is mounted on the valve body (1); a bracket (7) is mounted on the valve cover (2); a hand wheel (5) is rotatably mounted on the bracket (7); the top end of the valve stem (4) passes through the bracket (7) and is threadedly connected to the hand wheel (5); the valve stem (4) is slidably connected to the valve body (1); a valve flap assembly (3) is mounted on the bottom end of the valve stem (4); a protective assembly (6) is slidably mounted in the valve body (1); a cut-off port (11) is provided in the valve body (1), and the protective assembly (6) is slidably mounted at the cut-off port (11); The valve flap assembly (3) comprises an upper valve flap (31), the upper valve flap (31) being mounted on the bottom end of the valve stem (4), a lower valve flap (34) being slidably mounted on the upper valve flap (31), a blocking spring (32) being mounted between the upper valve flap (31) and the lower valve flap (34), an airbag ring (33) being mounted between the upper valve flap (31) and the lower valve flap (34), and a sealing detection assembly (35) being mounted in the upper valve flap (31); The upper valve disc (31) is provided with a sealing groove (312), and the side of the sealing groove (312) close to the valve body (1) is sloped. The upper valve disc (31) is provided with a side retaining ring (311), and the upper valve disc (31) is provided with an upper wing ring (313), and the upper wing ring (313) is connected to the top end of the airbag ring (33); The lower valve disc (34) includes a bottom plate (341), the bottom end of the bottom plate (341) is provided with an oblique cut surface (343), a plurality of connecting rods (342) are installed on the lower valve disc (34), the top end of the connecting rod (342) passes through the upper valve disc (31) and is provided with a drainage ring (345), the drainage ring (345) is engaged with the sealing measurement groove (312), the bottom plate (341) is provided with an extrusion groove (344), the side retaining ring (311) is engaged in the extrusion groove (344), the bottom plate (341) is provided with a lower wing ring (346), the lower wing ring (346) is connected to the bottom end of the airbag ring (33), a blocking spring (32) is installed between the bottom plate (341) and the upper valve disc (31), and the sealing detection component (35) is located at the bottom end of the drainage ring (345); The sealing detection assembly (35) includes a detection ring (351), an elastic diaphragm (357) and a transmission block (354). The detection ring (351) is engaged with the sealing detection groove (312). The detection ring (351) is located at the bottom end of the drainage ring (345). The detection ring (351) is made of a low-density material. A detection rod (352) is installed at the bottom end of the detection ring (351). A detection block (353) is installed at the bottom end of the detection rod (352). The detection rod (352) is slidably connected to the upper valve disc (31). The detection block (353) is connected to the upper valve disc (31). 53) is slidably connected to the upper valve disc (31), the transmission block (354) is slidably connected to the upper valve disc (31), a contact (355) is provided on one side of the transmission block (354), the elastic diaphragm (357) is installed in the upper valve disc (31), a piezoelectric crystal (356) is installed in the elastic diaphragm (357), a first inclined surface is provided on the detection block (353), a second inclined surface is provided on the transmission block (354), the first inclined surface is slidably connected to the second inclined surface, and the contact (355) is aligned with the central axis of the piezoelectric crystal (356).

2. A stop valve based on sealing self-test according to claim 1, characterized in that: The airbag ring (33) is provided with an upper end surface (333) and a lower end surface (334), the upper end surface (333) is connected to the upper wing ring (313), and the lower end surface (334) is connected to the lower wing ring (346). The airbag ring (33) is provided with a limiting surface (331), and the limiting surface (331) is in contact with the side retaining ring (311). The airbag ring (33) is provided with an expansion surface (332), and the expansion surface (332) is located on a side close to the intercepting port (11). The airbag ring (33) is filled with a medium.

3. A stop valve based on sealing self-test according to claim 1, characterized in that: The protective assembly (6) includes a slip ring (63), the slip ring (63) is slidably connected to the intercepting port (11), a plurality of sliders (61) are provided on the slip ring (63), the intercepting port (11) is provided with a plurality of inclined slide grooves (12), the sliders (61) are slidably connected to the inclined slide grooves (12), a reciprocating spring (62) is installed between the slider (61) and the inclined slide grooves (12), a driving ring (64) is installed in the slip ring (63), and an annular bevel head (65) is provided at the top end of the slip ring (63).

4. A stop valve based on sealing self-test according to claim 1, characterized in that: The valve stem (4) is provided with a limiting slide bar (41), the limiting slide bar (41) is slidably connected to the bracket (7) and the valve body (1), the valve stem (4) is provided with an adjusting thread, and the valve stem (4) is threadedly connected to the hand wheel (5) via the adjusting thread.

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