Stop valve based on sealing performance self-inspection

Abstract

The invention discloses a stop valve based on sealing performance self-inspection, and relates to the technical field of stop valves. Comprising a valve body, a valve cover, a valve clack assembly, a valve rod, a hand wheel, a protection assembly and a support, displacement generated when a lower valve clack is closed is utilized, a sealing detection groove is automatically opened, leakage liquid is guided and collected, a detection ring is driven by the leakage liquid to move upwards, accordingly, a detection block is driven to extrude a transmission block, a piezoelectric crystal is finally triggered, leakage physical quantity is converted into quantifiable electric signals, and the leakage physical quantity is detected. And the purpose of sealing self-inspection is achieved. When the valve clack assembly is opened, the design that the lower valve clack rebounds automatically is utilized, the liquid drainage ring is driven to be embedded into the sealing measuring groove, leakage liquid in the sealing measuring groove is squeezed out, and the liquid drainage effect is achieved. The lower valve clack and the upper valve clack are made to be close to each other through downward pressure generated when the valve clack assembly is closed, the air bag ring is extruded, the air bag ring generates one-way expansion to conduct secondary sealing on the closure opening, and the multiple sealing effect on the closure opening is achieved in combination with primary sealing between the upper valve clack and the closure opening and between the lower valve clack and the closure opening.

Description

Technical Field

[0001] The present invention relates to the technical field of globe valves, and specifically to a globe valve based on self-checking of sealing performance. Background Art

[0002] A globe valve is a valve device that realizes opening and closing control by the vertical movement of a valve flap. Its core function is to regulate or cut off the flow of the medium in the pipeline. In fields such as petrochemical industry, power system, water supply and drainage engineering, and heating and ventilation, the globe valve, through a reliable sealing structure and stable operating performance, can not only achieve fine regulation of the flow rate, but also quickly cut off the medium transmission during equipment maintenance or emergencies, effectively preventing safety hazards such as medium backflow and pressure out-of-control. Its flow design of low inlet and high outlet significantly reduces the opening and closing torque, and with the use of high-temperature and high-pressure resistant materials, it becomes a key control element to ensure the safe operation of the industrial system and extend the service life of the pipeline.

[0003] However, when the globe valve is working, there are still many technical defects. At the throttling port position of the globe valve, after long-term use, impurities such as scale and rust are likely to accumulate. When the valve flap closes, it will rub against these impurities, resulting in wear of the valve flap and reducing the sealing performance; for some pipelines with large flow fluctuations, the valve flap often leaks due to sudden impact forces; and the existing globe valves lack effective means for self-checking the sealing performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a globe valve based on self-checking of sealing performance to solve the problems proposed in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A globe valve based on self-checking of sealing performance, including a valve body and a valve stem. A valve cover is installed on the valve body, a bracket is installed on the valve cover, a handwheel is rotatably installed on the bracket, the top end of the valve stem penetrates through the bracket and is threadedly connected to the handwheel, the valve stem is slidably connected to the valve body, a valve flap assembly is installed at the bottom end of the valve stem, and a protection assembly is slidably installed in the valve body; a throttling port is provided in the valve body, and the protection assembly is slidably installed at the throttling port.

[0006] Fluid pipelines are respectively provided at both ends of the valve body, and both the inlet and the outlet are connected to fluid pipelines. An S-shaped flow channel is provided in the valve body, and the throttling port is located at the middle position of the S-shaped flow channel; by rotating the handle, the valve stem slides on the valve body, and the valve stem drives the valve flap assembly to move in the valve body. When the valve flap assembly is engaged with the throttling port, the closing operation of the globe valve is completed.

[0007] Further, the valve flap assembly includes an upper valve flap, the upper valve flap is installed at the bottom end of the valve stem, a lower valve flap is slidably installed on the upper valve flap, a plugging 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 component 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, and the upper wing ring 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, a beveled surface is provided at the bottom end of the bottom plate, a plurality 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 installed with a drain ring, the drain ring is embedded in the sealing measuring 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 valve disc assembly needs to be closed, the valve stem drives the upper valve disc to move, and the upper valve disc drives the entire valve disc assembly to move. As the valve disc assembly approaches the intercepting port, the chamfered surface on the lower valve disc first contacts and engages with the annular chamfered head, and the lower valve disc presses down the annular chamfered head until the annular chamfered head is reset and cannot move. Then, as the valve disc assembly further descends, the lower valve disc cannot continue to descend due to the obstruction of the annular chamfered head, and a relative displacement occurs between the upper valve disc and the lower valve disc. The two are close to each other, the blocking spring is compressed, and the upper and lower end faces of the airbag ring are squeezed by the upper ring wing and the lower ring wing respectively. The airbag ring begins to expand to both sides. Since the limiting surface on one side of the airbag ring is obstructed by the side retaining ring, the expansion surface of the airbag ring expands toward the intercepting port, blocking the intercepting port to achieve the purpose of secondary sealing. Subsequently, stop turning the hand wheel, the upper and lower valve discs engage with the intercepting port to form a primary seal of the intercepting port, and finally achieve the effect of multiple sealing of the intercepting port.

[0012] When the flow accumulated at the inlet of the valve body is large and the valve disc assembly is subjected to a large pressure, the upper valve disc is held by 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, and it fits more closely 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 another part of the impact into unilateral expansion of the airbag ring, thereby improving the sealing of the valve disc assembly under sudden impact.

[0013] Further, the seal detection assembly includes a detection ring, an elastic diaphragm, and a transmission block. The detection ring is fitted into the seal detection groove. The detection ring is located at the bottom end of the liquid discharge ring. The detection ring is made of a low-density material. A detection rod is installed at the bottom end of the detection ring, and a detection block is installed at the bottom end of the detection rod. The detection rod is slidably connected to the upper valve flap, the detection block is slidably connected to the upper valve flap, the transmission block is slidably connected to the upper valve flap. A contact is provided on one side of the transmission block. The elastic diaphragm is installed inside the upper valve flap, and a piezoelectric crystal is installed inside the elastic diaphragm. A first inclined surface is provided on the detection block, and a second inclined surface is provided on the transmission block. The first inclined surface is slidably connected to the second inclined surface, and the contact is aligned with the central axis of the piezoelectric crystal.

[0014] The transmission block is horizontally slidably connected to the upper valve flap, and the detection block is vertically slidably connected to the upper valve flap; the detection ring is made of a lightweight material with a density lower than that of the fluid. When the valve flap assembly is not closed, the liquid discharge ring is fitted into the seal detection groove.

[0015] In the closed state of the valve flap assembly, since the lower valve flap and the upper valve flap approach each other, the liquid discharge ring disengages from the seal detection groove, and the seal detection groove is in an open state. When there is leakage between the valve flap assembly and the throttling port, the leakage liquid flows upward from the gap between the valve flap assembly and the throttling port. Part of the leakage liquid flows into the seal detection groove from the top end of the upper wing ring. The detection ring at the bottom of the seal groove floats upward 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 exerts extrusion on the second inclined surface of the transmission block, causing the transmission block to have a horizontal displacement and driving the contact to squeeze the piezoelectric crystal inside the elastic diaphragm. The greater the leakage amount, 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 intensity according to the degree of compression. After the external control system receives the electrical signal, it judges the leakage degree according to the intensity of the electrical signal. When the leakage degree exceeds the preset value, it sends a maintenance reminder to the staff, thus achieving the purpose of self-checking the sealing performance.

[0016] After the valve flap assembly is opened, the plugging spring rebounds and drives the lower valve flap to reset. The liquid discharge ring is fitted into the seal detection groove again. During the fitting process, the liquid discharge ring squeezes out the leakage liquid in the seal detection groove, achieving the effect of discharging the liquid and closing and resetting the seal detection assembly.

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

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

[0019] Further, the protection component includes a slip ring, which is slidably connected to the intercepting port. The slip ring is provided with a number of sliding heads, and the intercepting port is provided with a number of inclined chutes. The sliding heads are slidably connected to the inclined chutes, and a reciprocating spring is installed between the sliding heads and the inclined chutes. A driving ring is installed inside the slip ring, and an annular beveled head is provided at the top of the slip ring.

[0020] When the stop valve is in the open state, the fluid enters the S-shaped flow channel in the valve body from the pipeline, and flows out from the pipeline at the other end after passing through the protection component at the intercepting port. When the fluid passes through the protection component, the driving ring is driven by the fluid impact to drive the slip ring to generate displacement. Under the cooperation of the sliding heads and the inclined chutes, the slip ring rotates and moves upward along the path of the inclined chute, and the reciprocating spring is compressed. During this process, the annular beveled head on the slip ring scrapes the scale, rust and other impurities attached to the inner wall of the intercepting port. Moreover, the greater the fluid impact, the greater the compression degree of the reciprocating spring, the greater the rotational displacement of the slip ring, and the more obvious the scraping effect of the slip ring driving the annular beveled head. With the fluctuation of the fluid flow rate, the annular beveled head reciprocally rotates and displaces at the position of the intercepting port, continuously cleaning the intercepting port, keeping the intercepting port clean, and avoiding the valve flap assembly from being scratched by the impurities at the intercepting port when it is fitted with the intercepting port, which affects the sealing performance and service life. And the bumping effect generated during the reciprocating displacement of the annular beveled head makes itself not easily attached by impurities, achieving the purpose of self-cleaning.

[0021] Further, a limiting slide bar is provided on the valve stem. The limiting slide bar is slidably connected to the bracket and the valve body. The valve stem is provided with adjusting threads, and the valve stem is threadedly connected to the handwheel through the adjusting threads.

[0022] The limiting slide bar is used to limit the rotation of the valve stem. When the handwheel is rotated, the valve stem is driven to slide up and down through the adjusting threads. The valve stem drives the valve flap assembly to move up and down. When the valve flap assembly is tightly fitted with the intercepting port, the interception of the flow rate is realized.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. Utilize the downward pressure when the valve flap assembly is closed to make the lower valve flap approach the upper valve flap, squeeze the airbag ring, and the airbag ring generates a one-way expansion to perform secondary sealing on the intercepting port. Combining the primary sealing between the upper and lower valve flaps and the intercepting port, the effect of multiple sealing on the intercepting port is realized, improving the sealing reliability and making up for the deficiencies of traditional single-layer sealing.

[0025] 2. When the inlet pressure of the valve body increases, the lower valve flap is pressed upward to further compress the airbag ring, making the expansion surface fit more closely with the intercepting port, realizing the effect that the sealing strength adapts to the increase of pressure. When a sudden flow impact occurs, the displacement of the lower valve flap and the compression of the blocking spring act together to absorb and convert the impact energy into reversible mechanical deformation, reducing the impact force on the valve flap assembly and improving the sealing performance of the valve flap assembly under sudden impact.

[0026] 3. Utilize the displacement when the lower valve flap closes to automatically open the sealing measurement groove. Through the ramp design of the sealing measurement groove, divert and collect the leakage liquid. Drive the detection ring to move upward by the leakage liquid, thereby driving the detection block to squeeze the transmission block, and finally trigger the piezoelectric crystal, converting the leakage physical quantity into a quantifiable electrical signal to achieve the purpose of self-checking the sealing performance. Utilize the design that the lower valve flap automatically rebounds when the valve flap assembly opens, drive the drainage ring to fit with the sealing measurement groove, and squeeze out the leakage liquid in the sealing measurement groove to achieve the drainage effect and make the sealing detection assembly close and reset.

[0027] 4. Utilize the fluid kinetic energy to drive the sliding ring to rotate and move upward. Through the cooperation of the inclined chute and the sliding head, convert the linear impact into the spiral scraping motion of the annular bevel head. The annular bevel head reciprocally rotates and displaces at the throttling port position along with the fluctuation of the fluid flow rate, continuously cleaning the throttling port to keep it clean, and avoiding being scratched by the impurities at the throttling port when the valve flap assembly fits with the throttling port, which may affect the sealing performance and service life; utilize the bumps generated during the reciprocating displacement of the annular bevel head to achieve the purpose of self-cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the overall three-dimensional view of the globe valve of the present invention;

[0029] Figure 2 It is the three-dimensional view of the globe valve of the present invention;

[0030] Figure 3 It is the three-dimensional view of the protection component of the present invention;

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

[0032] Figure 5 It is the three-dimensional view of the valve flap assembly of the present invention;

[0033] Figure 6 It is the three-dimensional view of the upper valve flap of the present invention;

[0034] Figure 7 It is the three-dimensional view of the lower valve flap of the present invention;

[0035] Figure 8 It is of the present invention Figure 5 Partial enlarged view of area A;

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

[0037] Figure 10 It is the three-dimensional view of the sealing detection assembly of the present invention.

[0038] In the figure: 1. Valve body; 2. Valve cover; 3. Valve flap assembly; 4. Valve stem; 5. Handwheel; 6. Protection assembly; 7. Bracket; 61. Slide head; 62. Reciprocating spring; 63. Slide ring; 64. Driving ring; 65. Annular bevel head; 11. Throttling port; 12. Inclined chute; 41. Limit slide bar; 31. Upper valve flap; 32. Sealing spring; 33. Airbag ring; 34. Lower valve flap; 35. Sealing detection assembly; 311. Side retaining ring; 312. Sealing detection groove; 313. Upper wing ring; 341. Bottom plate; 342. Connecting rod; 343. Inclined plane; 344. Extrusion groove; 345. Drainage 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 implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] As Figures 1 - 10 shown, the present invention provides a globe valve technical solution based on self-checking of sealing performance: including 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 end of the valve stem 4 penetrates through the bracket 7 and is threadedly connected to the handwheel 5. The valve stem 4 is slidably connected to the valve body 1. The bottom end of the valve stem 4 is installed with a valve flap assembly 3. A protection assembly 6 is slidably installed in the valve body 1; a throttling port 11 is provided in the valve body 1, and the protection assembly 6 is slidably installed at the throttling port 11.

[0041] An inlet and an outlet are respectively provided at both ends of the valve body 1. Both the inlet and the outlet are connected with fluid pipelines. An S-shaped flow channel is provided in the valve body 1. The throttling port 11 is located at the middle position of the S-shaped flow channel; by rotating the handle, the valve stem 4 slides 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 throttling port 11, the closing operation of the globe valve is completed.

[0042] A limit slide bar 41 is provided on the valve stem 4. The limit slide bar 41 is slidably connected to the bracket 7 and the valve body 1. An adjusting thread is provided on the valve stem 4. The valve stem 4 is threadedly connected to the handwheel 5 through the adjusting thread.

[0043] The limiting slide bar 41 is used to limit the rotation of the valve stem 4. When the handwheel 5 is rotated, the valve stem 4 slides up and down by adjusting the thread. 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 throttling port 11, the flow is stopped.

[0044] The protection component 6 includes a sliding ring 63. The sliding ring 63 is slidably connected to the throttling port 11. A number of sliding heads 61 are provided on the sliding ring 63. A number of inclined sliding grooves 12 are provided on the throttling port 11. The sliding heads 61 are slidably connected to the inclined sliding grooves 12. A reciprocating spring 62 is installed between the sliding heads 61 and the inclined sliding grooves 12. A driving ring 64 is installed inside the sliding ring 63. An annular beveled head 65 is provided at the top of the sliding ring 63.

[0045] The valve flap assembly 3 includes an upper valve flap 31. The upper valve flap 31 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 plugging 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. A seal detection component 35 is installed inside the upper valve flap 31.

[0046] A seal measurement groove 312 is provided on the upper valve flap 31. The side of the seal measurement groove 312 close to the valve body 1 is in a slope shape. A side retaining ring 311 is provided on the upper valve flap 31. An upper wing ring 313 is provided on the upper valve flap 31. The upper wing ring 313 is connected to the top end 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 throttling port 11.

[0047] The lower valve flap 34 includes a bottom plate 341. An inclined cutting 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 flap 34. The top ends of the connecting rods 342 penetrate through the upper valve flap 31 and a liquid discharge ring 345 is installed. The liquid discharge ring 345 is fitted with the seal measurement groove 312. An extrusion groove 344 is provided on the bottom plate 341. The side retaining ring 311 is fitted in the extrusion groove 344. A lower wing ring 346 is provided on the bottom plate 341. The lower wing ring 346 is connected to the bottom end of the airbag ring 33. A plugging spring 32 is installed between the bottom plate 341 and the upper valve flap 31. The seal detection component 35 is located at the bottom end of the liquid discharge ring 345.

[0048] The seal detection assembly 35 includes a detection ring 351, an elastic diaphragm 357 and a transmission block 354. The detection ring 351 is fitted into the seal detection groove 312. The detection ring 351 is located at the bottom end of the drain 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 flap 31. The detection block 353 is slidably connected to the upper valve flap 31. The transmission block 354 is slidably connected to the upper valve flap 31. A contact 355 is provided on one side of the transmission block 354. The elastic diaphragm 357 is installed inside the upper valve flap 31. A piezoelectric crystal 356 is installed inside 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. 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 flap 31, and the detection block 353 is vertically slidably connected to the upper valve flap 31; the detection ring 351 is made of a lightweight material with a density lower than that of the fluid. When the valve flap assembly 3 is not closed, the drain ring 345 is fitted into the seal detection groove 312.

[0050] 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 blocking ring 311. The airbag ring 33 is provided with an expansion surface 332, and the expansion surface 332 is located on the side close to the throttling 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: When the globe valve is in the open state, the fluid enters the S-shaped flow channel in the valve body 1 from the pipeline, and flows out from the other end of the pipeline after passing through the protection assembly 6 at the throttling port 11. When the fluid passes through the protection assembly 6, the driving ring 64 is impacted by the fluid and drives the sliding ring 63 to generate a displacement. Under the cooperation of the sliding head 61 and the inclined chute 12, the sliding ring 63 rotates and moves upward along the path of the inclined chute 12, and the reciprocating spring 62 is compressed. During this process, the annular bevel head 65 on the sliding ring 63 scrapes the scale, rust and other impurities attached to the inner wall of the throttling port 11. Moreover, the greater the fluid impact, the greater the compression degree of the reciprocating spring 62, the greater the rotational displacement of the sliding ring 63, and the more obvious the scraping effect of the sliding ring 63 driving the annular bevel head 65. Along with the fluctuation of the fluid flow rate, the annular bevel head 65 reciprocally rotates and displaces at the position of the throttling port 11, continuously cleaning the throttling port 11, keeping the throttling port 11 clean, and avoiding being scratched by the impurities at the throttling port 11 when the valve flap assembly 3 is fitted into the throttling port 11, which affects the sealing performance and service life; and the bumping effect generated by the reciprocating displacement of the annular bevel head 65 makes itself not easily attached by impurities, achieving the purpose of self-cleaning.

[0052] When the valve flap assembly 3 needs to be closed, the valve stem 4 drives the upper valve flap 31 to move, and the upper valve flap 31 drives the entire valve flap assembly 3 to move. As the valve flap assembly 3 approaches the intercepting port 11, the chamfered surface 343 on the lower valve flap 34 first contacts and engages with the annular chamfered head 65, and the lower valve flap 34 presses down the annular chamfered head 65 until the annular chamfered head 65 is reset and cannot move. Then, as the valve flap assembly 3 further descends, the lower valve flap 34 is blocked by the annular chamfered head 65 and cannot continue to descend. The upper valve flap 31 and the lower valve flap 34 are relatively displaced, and the two are close to each other. The blocking spring 32 is compressed, and the upper end surface 333 and the lower end surface 334 of the airbag ring 33 are squeezed by the upper ring wing and the lower ring wing respectively. The airbag ring 33 begins to expand to both sides. Since 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, and the intercepting port 11 is blocked to achieve the purpose of secondary sealing. Subsequently, the hand wheel 5 is stopped, and the upper valve flap 31 and the lower valve flap 34 are engaged with the intercepting port 11 to form a primary seal for the intercepting port 11, and finally achieve the effect of multiple sealing of 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, since the upper valve flap 31 is held by the valve stem 4 and cannot move, 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, and fits more closely with the intercepting port 11, so that the sealing is stronger; when the stop valve is suddenly closed or the inlet flow changes suddenly, 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 another part of the impact into the unilateral expansion of the airbag ring 33, thereby improving the sealing of the valve flap assembly 3 under sudden impact.

[0054] In the closed state of the valve flap assembly 3, since the lower valve flap 34 and the upper valve flap 31 are close to each other, the drain ring 345 disengages from the sealing groove 312, and the sealing groove 312 is in an open state. When there is leakage between the valve flap assembly 3 and the throttling port 11, the leakage liquid flows upward from the gap between the valve flap assembly 3 and the throttling port 11. 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 upward under the buoyancy of the leakage liquid. The detection ring 351 drives the detection block 353 to move upward through the detection rod 352 at the bottom. The first inclined surface of the detection block 353 squeezes the second inclined surface of the transmission block 354, causing the transmission block 354 to have a horizontal displacement and driving the contact 355 to squeeze the piezoelectric crystal 356 in the elastic diaphragm 357. The greater the leakage amount, 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 compression. After the external control system receives the electrical signal, it judges the leakage degree according to the intensity of the electrical signal. When the leakage degree exceeds the preset value, a maintenance reminder is sent to the staff, thus achieving the purpose of self-checking the sealing performance.

[0055] After the valve flap assembly 3 is opened, the blocking spring 32 rebounds and drives the lower valve flap 34 to reset. During the reset process, the drain ring 345 disengages from the sealing groove 312. During the engagement process, the drain ring 345 squeezes out the leakage liquid in the sealing groove 312, achieving the effect of draining the liquid and closing and resetting the seal detection assembly 35.

[0056] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A stop valve based on sealing self-checking, characterized in that: 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 shutoff port (11) is provided in the valve body (1); and the protective assembly (6) is slidably mounted at the shutoff port (11).

2. A stop valve based on sealing self-checking according to claim 1, characterized in that: The valve flap assembly (3) comprises an upper valve flap (31), wherein the upper valve flap (31) is mounted on the bottom end of the valve stem (4), a lower valve flap (34) is slidably mounted on the upper valve flap (31), a blocking spring (32) is mounted between the upper valve flap (31) and the lower valve flap (34), an airbag ring (33) is mounted between the upper valve flap (31) and the lower valve flap (34), and a sealing detection assembly (35) is mounted inside the upper valve flap (31).

3. A stop valve based on sealing self-checking according to claim 2, characterized in that: 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).

4. A stop valve based on sealing self-checking according to claim 3, characterized in that: The lower valve disc (34) comprises a bottom plate (341), the bottom end of which is provided with a chamfered surface (343), a plurality of connecting rods (342) are installed on the lower valve disc (34), the top ends of the connecting rods (342) penetrate the upper valve disc (31) and are provided with a drainage ring (345), the drainage ring (345) is engaged with the sealing measuring 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).

5. A stop valve based on sealing self-checking according to claim 4, characterized in that: The sealing detection assembly (35) comprises 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 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).

6. A stop valve based on sealing self-checking according to claim 4, 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.

7. A stop valve based on sealing self-checking according to claim 1, characterized in that: The protection component (6) comprises a slip ring (63), the slip ring (63) is slidably connected to the intercepting port (11), a plurality of slide heads (61) are provided on the slip ring (63), the intercepting port (11) is provided with a plurality of inclined slide grooves (12), the slide heads (61) are slidably connected to the inclined slide grooves (12), a reciprocating spring (62) is installed between the slide heads (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).

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

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