Ultralow-temperature soft seal ball valve
By designing the inflatable first and second chambers in the soft seal ball valve, and using fluid pressure to make the valve ball closely fit the valve seat on the outlet side, the problem of leakage of the soft seal ball valve at low temperature is solved, and better sealing and service life are achieved.
Patent Information
- Application Number
- CN202510196244.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-06-27
AI Technical Summary
The soft sealed ball valve is prone to leakage at low temperatures, mainly because the valve core does not fit with the inner wall of the valve cavity due to thermal expansion and contraction under low temperature conditions.
An ultra-low temperature soft seal ball valve is designed. The valve ball is composed of a base body, a first valve membrane and a second valve membrane. The first chamber and the second chamber are inflated. The communication between the through hole and the water inlet and the water outlet is controlled by the rotation of the valve ball. The gas in the chamber is transferred by fluid pressure, causing the valve ball to fit closely with the valve seat on the outlet side to ensure sealing.
It effectively avoids leakage problems caused by the soft sealed ball valve due to the inconsistency of the valve core and the inner wall of the valve chamber at low temperatures, ensures the sealing of the valve, reduces the wear and tear when the valve ball rotates, and extends the service life of the valve ball.
Smart Images
Figure CN120212263A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ball valves, and particularly to an ultra-low temperature soft-sealed ball valve. Background Art
[0002] A ball valve is a valve with a spherical closing member, and the closing member is driven by a valve stem and rotates around the axis of the ball valve. Ball valves have the advantages of simple structure, small size, light weight, and convenient maintenance, so they are widely used in production and life.
[0003] In a ball valve, for the valve core as the closing member, its manufacturing materials are divided into soft materials and hard materials. Hard materials are generally metal materials, while soft materials usually choose plastic or rubber materials. The manufacturing material of the ball valve core made of metal material is expensive, and due to the large processing difficulty and high precision requirements, the manufacturing cost is relatively high. The ball valve core made of soft material has a lower manufacturing cost compared to the former because of the low material cost and easy processing, and is more widely used in production and life.
[0004] During the use of a ball valve, in order to ensure that the valve does not leak when closed, the valve core usually fits with the inner wall of the valve cavity. When the valve is opened and closed, the spherical valve core needs to be rotated, that is, the valve core will rub against the inner wall of the valve cavity during rotation. After long-term use, the valve core will wear due to the friction with the inner wall of the valve cavity, resulting in a gap between the valve core and the valve cavity, and then causing leakage of the ball valve. Since the valve core made of soft material has a lower hardness, the wear of the ball valve core made of soft material will be more serious, and the possibility of leakage will be greater. When the environment is in a low-temperature state, due to the principle of thermal expansion and contraction, the material will contract at low temperature, and the valve core of the soft-sealed ball valve is also likely to be not in good contact with the inner wall of the valve cavity due to contraction, resulting in leakage.
[0005] Therefore, an ultra-low temperature soft-sealed ball valve is proposed to solve the problem that the soft-sealed ball valve is prone to leakage at low temperature. Summary of the Invention
[0006] The purpose of the present invention is to provide an ultra-low temperature soft-sealed ball valve to solve the problem that the soft-sealed ball valve is prone to leakage at low temperature as mentioned in the above background art.
[0007] To achieve the above purpose, the present invention provides the following technical solutions:
[0008] A super low temperature soft sealing ball valve comprises a valve body, a valve cavity is arranged inside the valve body, a valve seat is arranged inside the valve cavity, a water inlet and a water outlet are arranged on the valve body, the water inlet and the water outlet are both communicated with the valve cavity, a valve ball is rotatably installed inside the valve cavity, a through hole for connecting the water inlet and the water outlet is opened on the valve ball, a slot is arranged on the top of the valve ball, a valve stem is plugged and installed inside the slot, the top of the valve stem extends out of the valve body, the valve stem is used to drive the valve ball to rotate, a turntable for easy grasping is also fixedly connected to the top of the valve stem, and the valve ball package The invention comprises a base, a first valve membrane and a second valve membrane, wherein the base is flat, the through holes and the slots are arranged on the base, the first valve membrane and the second valve membrane are symmetrically arranged on the planes on both sides of the base, a closed first chamber is formed between the first valve membrane and the base, a closed second chamber is formed between the second valve membrane and the base, the first chamber and the second chamber are both filled with gas, the first valve membrane and the second valve membrane cooperate with the base to form a sphere, a connecting port is also arranged on the base, the connecting port is used to connect the first chamber and the second chamber, and the connecting port is not connected with the through hole.
[0009] The first chamber and the second chamber are filled with gas, which props up the first valve membrane and the second valve membrane. The propped-up first valve membrane and the second valve membrane cooperate with the base to form a spherical valve ball. The spherical valve ball can rotate horizontally driven by the valve stem and the turntable. By controlling the rotation of the valve ball, whether the through hole is connected to the water inlet and the water outlet can be controlled, so that the opening and closing of the soft sealing ball valve can be controlled.
[0010] When the through hole is completely offset from the water inlet and the water outlet, the first chamber or the second chamber on the water inlet side will be subject to the pressure of the fluid from the water inlet direction inside the valve. The pressure of the fluid reduces the volume of the pressurized chamber, and the gas inside the chamber flows from the connecting port to the unpressurized chamber. The first chamber or the second chamber on the water outlet side will expand from the inside to the outside due to the increase of internal gas. After the chamber expands, the first valve membrane or the second valve membrane will fit more closely to the inner wall of the valve cavity, and will fit more closely to the valve seat on the water outlet side, thereby ensuring that the soft-sealed ball valve will not leak due to the gap between the valve cavity and the valve ball.
[0011] Preferably, when the water inlet is separated from the water outlet, the first chamber faces the direction of the water outlet, and the second chamber faces the direction of the water inlet; a slide groove is horizontally opened on the base, the slide groove is connected with the slot and is not connected with the through hole, a sliding rod is arranged inside the first valve cavity, the sliding rod is slidably installed inside the slide groove, and the sliding rod extends into the slot, a guide block is fixedly installed on the part of the sliding rod extending into the slot, and an inclined guide slope is arranged on the guide block, a push spring is arranged on the valve body, the push spring is used to push the valve stem upward, and an inclined extrusion portion is arranged at the bottom of the valve stem.
[0012] When the valve stem is pressed downward, the extrusion part at the bottom of the valve stem squeezes the guide slope and pulls the slide bar toward the first chamber. The slide bar is pulled toward the water inlet by pressing the valve stem downward, thereby shrinking the volume of the first chamber toward the water outlet, thereby avoiding excessive friction between the valve ball and the inner wall of the valve chamber during the process of the valve stem rotating the valve ball, which affects the rotation of the valve ball, and also reduces the wear of the valve ball during rotation, thereby ensuring the sealing performance of the soft-sealed ball valve and the smoothness of the use and service life of the valve ball.
[0013] Preferably, a warping ring is provided inside the second chamber, and the warping ring is slidably installed inside the second chamber, the ring wall of the warping ring is in a "C" shape, the end of the warping ring close to the base is the supporting end, and the end of the warping ring away from the base is the pressure end, the warping ring gradually shrinks from the supporting end toward the pressure end to form a trumpet shape, the supporting end and the pressure end of the warping ring are both in contact with the inner wall of the second valve membrane, and a plurality of cracks are opened on the supporting end of the warping ring, and the plurality of cracks are evenly distributed on the warping ring with the axis of the warping ring as the reference circumference.
[0014] When the through hole is completely offset from the water inlet and outlet, that is, when the soft-sealed ball valve is closed, the fluid inside the soft-sealed ball valve squeezes the second valve membrane under the action of pressure, and the second valve membrane is deformed after being compressed, and the gas inside the second chamber flows toward the first chamber. When the second valve membrane is deformed, the pressure of the fluid is also applied to the pressure-bearing end of the warp ring. After the pressure is applied, the pressure-bearing end pushes the warp ring as a whole toward the first chamber. However, due to the obstruction of the warp ring by the base, the warp ring cannot move. The warp ring can only be deformed when it continues to be compressed. After the pressure is applied, the pressure-bearing end squeezes the support end. After being squeezed, the support end is expanded in an umbrella shape based on the axis of the warp ring. After the expansion, the support end supports the second valve membrane from the inside, so that the second valve membrane is more closely fitted to the inner wall of the valve cavity, further ensuring the degree of fit between the valve ball and the valve cavity, and avoiding leakage of the soft-sealed ball valve.
[0015] Preferably, a cylindrical receiving groove is provided on the base on one side of the second chamber, the axis of the receiving groove is aligned with the axis of the tilting ring, a cylindrical top block is slidably installed inside the receiving groove, an arc-shaped convex top is provided at one end of the top block away from the base, and the slide groove is connected to the bottom of the receiving groove.
[0016] When the sliding rod moves towards the second chamber, due to the compression of the first chamber, the gas in the first chamber is squeezed towards the inside of the second chamber. The gas in the second chamber counteracts the fluid pressure at the water inlet, reducing the pressure on the compressed end of the warping ring. After the pressure of the warping ring decreases, it will reset under the action of its own elasticity, and the supporting end retracts towards the axis direction, reducing the degree to which the second valve film is pushed outwards. In addition, when the sliding rod moves towards the second valve chamber, the end of the sliding rod will push against the bottom of the top block, causing the top block to move away from the base. The convex top on the top of the top block will push the warping ring towards the water inlet direction from the middle of the warping ring, further reducing the pressure on the supporting end. Then, the supporting end of the warping ring will further contract and reset towards its own axis direction under the action of its own elastic force, reducing the friction between the second valve film and the inner wall of the valve chamber, facilitating the rotation of the valve ball, reducing the wear during the rotation of the valve ball, and improving the service life of the valve ball.
[0017] Preferably, a collar is arranged inside the first chamber. The material of the collar is the same as that of the first valve film. One end of the collar is fixedly connected to the base, and the other end is fixedly connected to the first valve film. The collar, in cooperation with the first valve film and the base, encloses a sealed isolation space, and the communication port is not communicated with the isolation space. The setting of the isolation space occupies the internal space of the first chamber, reducing the internal space of the first chamber. When the gas in the second chamber enters the first chamber, only less gas is needed to expand the first chamber, and the first valve film is expanded in a ring shape and fits with the valve chamber, ensuring that the soft-sealed ball valve does not leak. In this way, the deformation sensitivity of the first chamber is improved, enabling the soft-sealed ball valve to be well used when applied to low-pressure pipelines, which helps to improve the applicability of the soft-sealed ball valve.
[0018] In addition, since the material of the collar is the same as that of the first valve film, when the sliding rod pulls the first valve film towards the second chamber, the collar will also deform to adapt and will not hinder the deformation movement of the first valve film.
[0019] Preferably, a connecting plate is arranged inside the first chamber. The connecting plate is annular, and the sliding rod is fixedly connected to the first valve film through the connecting plate. The connecting plate connects the sliding rod and the first valve film, and the connection area between the connecting plate and the first valve film is larger than the connection area between the sliding rod and the first valve film. In addition, due to the arrangement of the connecting plate, it is equivalent to thickening the first valve film at the position where the sliding rod is connected to the first valve film, effectively avoiding the situation that the first valve film is damaged due to stress concentration at the connection position with the sliding rod.
[0020] Preferably, a first annular groove and a second annular groove are respectively formed on the left and right sides of the base. The end of the first valve film is inserted into the first annular groove and is hermetically connected to the base; the second valve film is inserted into the second annular groove and is hermetically connected to the base.
[0021] The edge of the first valve membrane is inserted into the first annular groove and then hermetically connected to the base body, so that the connection position between the first valve membrane and the base body is received inside the first annular groove. Since the material at the connection position is not integrally formed with the valve membrane, the strength is reduced. When the first valve membrane is expanded by the gas inside the first chamber, it is easy to cause stress concentration and breakage at the connection between the first valve membrane and the base body. After receiving the connection position between the first valve membrane and the base body inside the first annular groove, the connection area between the first valve membrane and the base body increases, making it more stable. And when the first valve membrane is expanded by the gas, it is difficult for the gas to apply a shearing force to the connection position between the valve membrane and the base body, thereby avoiding the situation of stress concentration and breakage at the connection between the first valve membrane and the base body.
[0022] The function of the second annular groove is the same as that of the first annular groove, which is also to avoid stress concentration and breakage at the connection between the second valve membrane and the base body.
[0023] Preferably, a sealing ring is provided on the sliding rod, and the sealing ring is used to prevent the gas inside the first chamber and the second chamber from leaking into the slot, preventing the gas inside the first chamber and the second chamber from leaking from the slot, which may cause the first valve membrane and the second valve membrane not to be lifted, and then affect the sealing performance of the soft-sealed ball valve.
[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0025] 1. An ultra-low temperature soft-sealed ball valve designed by the present invention, compared with the existing soft-sealed ball valve, is provided with a first chamber and a second chamber on the valve ball. After the ball valve is closed, the fluid inside the ball valve squeezes the chamber facing the water inlet, so that the gas inside the chamber transfers to the chamber facing the water outlet and expands the chamber, making the valve ball fit more tightly with the valve seat on the water outlet side, thereby avoiding leakage.
[0026] 2. An ultra-low temperature soft-sealed ball valve designed by the present invention is also provided with a sliding rod. By pressing down the valve rod, the sliding rod is pulled towards the water inlet direction, thereby reducing the volume of the first chamber facing the water outlet direction. This avoids excessive friction between the valve ball and the inner wall of the valve chamber during the process of the valve rod rotating the valve ball, which affects the rotation of the valve ball, and also reduces the wear of the valve ball during rotation. It not only ensures the sealing performance of the soft-sealed ball valve but also ensures the smooth operation and service life of the valve ball.
[0027] 3. An ultra-low temperature soft-sealed ball valve designed by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 is a three-dimensional structural schematic diagram of the present invention;
[0029] Figure 2 It is a left side view of the present invention;
[0030] Figure 3 For the present invention Figure 2 Sectional view at AA in the middle;
[0031] Figure 4 For the present invention Figure 3 The enlarged view of point B in the middle;
[0032] Figure 5 For the present invention Figure 4 Enlarged view of point C in the middle;
[0033] Figure 6 It is a schematic diagram of the internal structure when the water inlet, the water outlet and the through hole are aligned in the present invention;
[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the valve ball in the present invention;
[0035] Figure 8 It is a schematic diagram of the three-dimensional structure of the warping ring in the present invention.
[0036] In the figure: 1. valve body; 2. valve cavity; 3. valve seat; 4. water inlet; 5. water outlet; 6. valve ball; 601. base; 602. first valve membrane; 603. second valve membrane; 7. through hole; 8. slot; 9. valve stem; 10. turntable; 11. first chamber; 12. second chamber; 13. slide groove; 14. slide rod; 15. guide block; 16. guide slope; 17. push spring; 18. extrusion part; 19. warping ring; 20. supporting end; 21. pressure end; 22. crack; 23. accommodating groove; 24. top block; 25. convex top; 26. sleeve ring; 27. isolation space; 28. connecting plate; 29. first ring groove; 30. second ring groove; 31. sealing ring; 32. connecting port. DETAILED DESCRIPTION
[0037] See also Figures 1 to 8 The present invention provides an ultra-low temperature soft sealing ball valve, and the technical solution is as follows:
[0038] A kind of ultra-low temperature soft sealing ball valve, reference Figures 1 to 3 , including a valve body 1, a valve cavity 2 is arranged inside the valve body 1, a valve seat 3 is arranged inside the valve cavity 2, a water inlet 4 and a water outlet 5 are arranged on the valve body 1, the water inlet 4 and the water outlet 5 are both communicated with the valve cavity 2, a valve ball 6 is rotatably installed inside the valve cavity 2, a through hole 7 for connecting the water inlet 4 with the water outlet 5 is opened on the valve ball 6, a slot 8 is arranged on the top of the valve ball 6, a valve stem 9 is inserted and installed inside the slot 8, the top of the valve stem 9 extends out of the valve body 1, the valve stem 9 is used to drive the valve ball 6 to rotate, and a turntable 10 for easy grasping is also fixedly connected to the top of the valve stem 9.
[0039] refer toFigure 3 , Figure 4 Figure 5 and Figure 7 , the valve ball 6 further includes a base body 601, a first valve film 602 and a second valve film 603. The base body 601, the first valve film 602 and the second valve film 603 are all made of rubber material. The base body 601 is flat, and the through hole 7 and the slot 8 are both arranged on the base body 601. The first annular groove 29 and the second annular groove 30 are respectively formed on the planes on the left and right sides of the base body 601. The end of the first valve film 602 is inserted into the first annular groove 29 and is hermetically connected to the base body 601; the second valve film 603 is inserted into the second annular groove 30 and is hermetically connected to the base body 601. A closed first chamber 11 is formed between the first valve film 602 and the base body 601, and a closed second chamber 12 is formed between the second valve film 603 and the base body 601. The first chamber 11 and the second chamber 12 are both filled with gas. The first valve film 602 and the second valve film 603 cooperate with the base body 601 to form a spherical shape under the support of the gas. A communication port 32 is further arranged on the base body 601. The communication port 32 is used to communicate the first chamber 11 and the second chamber 12, and the communication port 32 is not communicated with the through hole 7.
[0040] In addition, referring to Figure 3 and Figure 4 , two chutes 13 are horizontally formed on the base body 601. The two chutes 13 are symmetrically arranged on the upper and lower sides of the through hole 7 with respect to the through hole 7. The two chutes 13 are both perpendicular to the through hole 7 in space and are not communicated with the through hole 7. The chute 13 located on the upper side of the through hole 7 is communicated with the slot 8. A connecting plate 28 is arranged inside the first chamber 11. The connecting plate 28 is annular, and the connecting plate 28 is adhesively and fixedly connected to the first valve film 602. Two sliding rods 14 are arranged inside the first valve chamber 2. The two sliding rods 14 are respectively slidably installed inside the two chutes 13, and the two sliding rods 14 are both fixedly connected to the connecting plate 28, so as to be fixedly connected to the first valve film 602. In addition, the sliding rod 14 located on the upper side of the through hole 7 extends into the slot 8. A guide block 15 is fixedly installed on the part of the sliding rod 14 located inside the slot 8 that extends into the slot 8. An inclined guide slope 16 is arranged on the guide block 15. A pushing spring 17 is arranged on the valve body 1. The pushing spring 17 is used to push the valve stem 9 upward. An inclined pressing part 18 is arranged at the bottom of the valve stem 9.
[0041] Referring to Figure 3 and Figure 4 , a collar 26 is further arranged inside the first chamber 11. The material of the collar 26 is the same as that of the first valve film 602. One end of the collar 26 is fixedly connected to the base body 601, and the other end is fixedly connected to the first valve film 602. The collar 26 cooperates with the first valve film 602 and the base body 601 to enclose a sealed isolation space 27. The communication port 32 is not communicated with the isolation space 27.
[0042] Reference Figure 3 、 Figure 4 and Figure 8 , a warping ring 19 is arranged inside the second chamber 12. The warping ring 19 is slidably installed inside the second chamber 12. The ring wall of the warping ring 19 is "C"-shaped. One end of the warping ring 19 close to the base body 601 is a supporting end 20, and one end of the warping ring 19 far from the base body 601 is a pressure-receiving end 21. The warping ring 19 gradually narrows from the supporting end 20 towards the pressure-receiving end 21 to form a horn shape. Both the supporting end 20 and the pressure-receiving end 21 of the warping ring 19 are attached to the inner wall of the second valve film 603. A plurality of slits 22 are formed in the supporting end 20 of the warping ring 19, and the plurality of slits 22 are circumferentially and evenly distributed on the warping ring 19 with the axis of the warping ring 19 as the reference.
[0043] Reference Figure 4 and Figure 5 , a cylindrical receiving groove 23 is formed in the base body 601 on one side of the second chamber 12. The axis of the receiving groove 23 is aligned with the axis of the warping ring 19. A cylindrical top block 24 is slidably installed inside the receiving groove 23. An arc-shaped convex top 25 is arranged at one end of the top block 24 far from the base body 601. Both the two sliding grooves 13 communicate with the bottom of the receiving groove 23. A sealing ring 31 is arranged on the upper sliding rod 14. The sealing ring 31 is used to prevent the gas inside the first chamber 11 and the second chamber 12 from leaking into the slot 8.
[0044] Reference Figure 3 、 Figure 4 and Figure 6 , after the valve ball 6 is installed in the middle and rear of the valve chamber 2, it is set that when the water inlet 4 is separated from the water outlet 5, the first chamber 11 faces the direction of the water outlet 5, and the second chamber 12 faces the direction of the water inlet 4. When the soft-sealing ball valve is installed in the pipeline system, the fluid is allowed to enter the soft-sealing ball valve from the water inlet 4 and then flow out of the soft-sealing ball valve from the water outlet 5.
[0045] During the use process, referring to Figure 3 and Figure 4 , if the soft-sealing ball valve is in the initial closed state, at this time, since the second chamber 12 faces the direction of the water inlet 4, the second valve film 603 is subjected to the pressure of the fluid in the pipeline system. The second valve film 603 is squeezed towards the direction of the first chamber 11. The second valve film 603 deforms and the space of the second chamber 12 is reduced. The gas inside the second chamber 12 is squeezed towards the first chamber 11 through the communication port 32. Since the gas in the first chamber 11 increases, the first valve film 602 is enlarged from the inside out. The outer surface of the first valve film 602 is pressed by the gas against the inner wall of the valve chamber 2 and is in close contact with the inner wall of the valve chamber 2, preventing the fluid at the water inlet 4 from flowing into the water outlet 5 through the gap between the valve ball 6 and the valve chamber 2 and avoiding leakage of the soft-sealing ball valve.
[0046] Meanwhile, referring to Figure 3 、Figure 4 , Figure 5 and Figure 8 , since the fluid presses against the second valve diaphragm 603, the second valve diaphragm 603 deforms under the pressure. When the second valve diaphragm 603 deforms, the pressure of the fluid is also applied to the pressure-receiving end 21 of the toggle ring 19. After the pressure-receiving end 21 is stressed, the entire toggle ring 19 is pushed towards the direction of the first chamber 11. However, due to the obstruction of the substrate 601 to the toggle ring 19, the toggle ring 19 cannot move. The toggle ring 19 can only deform under continuous pressure. After the pressure-receiving end 21 is pressured, it presses against the supporting end 20. After the supporting end 20 is pressed, it expands outwards in an umbrella shape with the axis of the toggle ring 19 as the reference. After the supporting end 20 expands, it supports the second valve diaphragm 603 from the inside, making the second valve diaphragm 603 fit more closely to the inner wall of the valve chamber 2, further ensuring the fitting degree between the valve ball 6 and the valve chamber 2, and preventing leakage of the soft-sealed ball valve.
[0047] When it is necessary to open the soft-sealed ball valve, refer to Figure 3 , Figure 4 and Figure 6 , press downwards to overcome the elastic force of the push spring 17 on the valve stem 9, and then rotate the turntable 10 clockwise by 90°. The valve stem 9 is stuck inside the slot 8 to drive the valve ball 6 to rotate, so that the through hole 7 on the valve ball 6 is aligned with the water inlet 4 and the water outlet 5. Subsequently, release the valve stem 9, and the valve stem 9 is pushed upwards under the action of the push spring 17 to reset. At this time, the soft-sealed ball valve is opened, and the fluid in the pipeline system flows from the water inlet 4 through the through hole 7 to the water outlet 5 and is discharged outside the soft-sealed ball valve, realizing the fluid transportation operation in the pipeline system.
[0048] When pressing down the valve stem 9, refer to Figure 4 , the extrusion part 18 at the bottom of the valve stem 9 presses against the guiding slope 16 and pulls the sliding rod 14 towards the direction of the first chamber 11. When the sliding rod 14 moves towards the water inlet 4, the sliding rod 14 pulls the first valve diaphragm 602 to deform and contract towards the direction of the second chamber 12 together. The volume of the first chamber 11 decreases, and the gas moves from the first chamber 11 towards the second chamber 12 through the communication port 32. After the volume of the first chamber 11 contracts, the friction between the first valve diaphragm 602 and the inner wall of the valve chamber 2 is reduced, facilitating the rotation of the valve ball 6.
[0049] Meanwhile, refer to Figure 4 and Figure 5, due to the compression of the first chamber 11, the gas in the first chamber 11 is squeezed towards the inside of the second chamber 12. The gas in the second chamber 12 counteracts the fluid pressure at the water inlet 4, causing the pressure at the pressed end 21 of the toggle ring 19 to decrease. After the pressure decreases, the toggle ring 19 will reset under the action of its own elasticity, and the supporting end 20 retracts towards the axial direction, reducing the degree to which the second valve film 603 is pushed outwards. In addition, when the sliding rod 14 moves towards the second valve chamber 2, the end of the sliding rod 14 will abut against the bottom of the top block 24, causing the top block 24 to move away from the base body 601. The convex top 25 on the top of the top block 24 will push the toggle ring 19 towards the water inlet 4 from the middle of the toggle ring 19, further reducing the pressure on the supporting end 20 of the toggle ring 19. As a result, the supporting end 20 of the toggle ring 19 further contracts and resets towards its own axial direction under the action of its own elastic force, reducing the friction between the second valve film 603 and the inner wall of the valve chamber 2, facilitating the rotation of the valve ball 6, and reducing the wear during the rotation of the valve ball 6, thereby increasing the service life of the valve ball 6.
[0050] In this way, the operation of the soft-sealed ball valve from closed to open is completed.
[0051] When switching the soft-sealed ball valve from the open state to the closed state, since neither the first valve film 602 nor the second valve film 603 is pressurized, the gas is evenly distributed inside the first chamber 11 and the second chamber 12. There will be no excessive extrusion between the valve ball 6 and the valve chamber 2, so there will be no excessive friction. Therefore, it only needs to rotate the turntable 10 counterclockwise by 90°, and there is no need to press the valve stem 9 downwards.
[0052] The above has described in detail a specific embodiment of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above-described embodiment. For those skilled in the art, without departing from the principles and ideas of the present invention, various changes, modifications, substitutions, and variations made to these embodiments should still fall within the protection scope of the present invention.
Claims
1. A cryogenic soft-sealed ball valve, comprising a valve body (1), a valve cavity (2) being arranged inside the valve body (1), a valve seat (3) being arranged inside the valve cavity (2), a water inlet (4) and a water outlet (5) being arranged on the valve body (1), a valve ball (6) being rotatably mounted inside the valve cavity (2), a through hole (7) being provided on the valve ball (6), a slot (8) being arranged on the top of the valve ball (6), a valve stem (9) being inserted and mounted inside the slot (8), the top of the valve stem (9) extending out of the valve body (1), the top of the valve stem (9) being fixedly connected to a rotating disk (10) for easy grasping, characterized in that: The valve ball (6) comprises a base (601), a first valve membrane (602) and a second valve membrane (603); the first valve membrane (602) and the second valve membrane (603) are symmetrically arranged on planes on both sides of the base (601); a closed first chamber (11) is formed between the first valve membrane (602) and the base (601); a closed second chamber (12) is formed between the second valve membrane (603) and the base (601); the first chamber (11) and the second chamber (12) are both filled with gas; the first valve membrane (602) and the second valve membrane (603) cooperate with the base (601) to form a spherical shape; a connecting port (32) is also arranged on the base (601); the connecting port (32) is used to connect the first chamber (11) and the second chamber (12), and the connecting port (32) is not connected to the through hole (7).
2. The ultra-low temperature soft sealing ball valve according to claim 1, characterized in that: When the water inlet (4) is separated from the water outlet (5), the first chamber (11) faces the water outlet (5), and the second chamber (12) faces the water inlet (4); a slide groove (13) is horizontally provided on the base (601), the slide groove (13) is connected to the slot (8) and the slide groove (13) is not connected to the through hole (7); a slide rod (14) is provided inside the first valve chamber (2), the slide rod (14) is slidably installed inside the slide groove (13), and the slide rod (14) extends into the slot (8); A guide block (15) is fixedly mounted on the portion of the slide rod (14) extending into the slot (8), and an inclined guide slope (16) is arranged on the guide block (15). A push spring (17) is arranged on the valve body (1), and the push spring (17) is used to push the valve stem (9) upward. An inclined extrusion portion (18) is arranged at the bottom of the valve stem (9). When the valve stem (9) is pressed downward, the extrusion portion (18) squeezes the guide slope (16) and pulls the slide rod (14) toward the first chamber (11).
3. The ultra-low temperature soft sealing ball valve according to claim 2, characterized in that: A warping ring (19) is arranged inside the second chamber (12). The warping ring (19) is slidably installed inside the second chamber (12). The ring wall of the warping ring (19) is in a "C" shape. The end of the warping ring (19) close to the base (601) is the supporting end (20), and the end of the warping ring (19) away from the base (601) is the pressure-bearing end (21). The warping ring (19) gradually shrinks from the supporting end (20) toward the pressure-bearing end (21) to form a trumpet shape. The supporting end (20) and the pressure-bearing end (21) of the warping ring (19) are both in contact with the inner wall of the second valve membrane (603). A plurality of cracks (22) are opened on the supporting end (20) of the warping ring (19). The plurality of cracks (22) are evenly distributed on the warping ring (19) with the axis of the warping ring (19) as the reference circumference.
4. The ultra-low temperature soft sealing ball valve according to claim 3, characterized in that: A cylindrical receiving groove (23) is provided on the base (601) on one side of the second chamber (12), and the axis of the receiving groove (23) is aligned with the axis of the tilting ring (19). A cylindrical top block (24) is slidably installed inside the receiving groove (23), and an arc-shaped convex top (25) is provided at one end of the top block (24) away from the base (601). The slide groove (13) is connected to the bottom of the receiving groove (23), and when the slide rod (14) moves toward the first valve chamber (2), the slide rod (14) pushes the top block (24) to move in a direction away from the base (601).
5. The ultra-low temperature soft sealing ball valve according to claim 1, characterized in that: A collar (26) is arranged inside the first chamber (11). The material of the collar (26) is the same as that of the first valve membrane (602). One end of the collar (26) is fixedly connected to the base (601), and the other end is fixedly connected to the first valve membrane (602). The collar (26) cooperates with the first valve membrane (602) and the base (601) to form a closed isolation space (27), and the communication port (32) is not connected to the isolation space (27).
6. The ultra-low temperature soft sealing ball valve according to claim 2, characterized in that: A connecting plate (28) is arranged inside the first chamber (11), and the connecting plate (28) is annular. The sliding rod (14) is fixedly connected to the first valve membrane (602) via the connecting plate (28).
7. The ultra-low temperature soft sealing ball valve according to claim 1, characterized in that: The base (601) is provided with a first annular groove (29) and a second annular groove (30) on the left and right sides respectively; the end of the first valve membrane (602) is inserted into the first annular groove (29) and is sealed to the base (601); the second valve membrane (603) is inserted into the second annular groove (30) and is sealed to the base (601).
8. The ultra-low temperature soft sealing ball valve according to claim 4, characterized in that: A sealing ring (31) is provided on the sliding rod (14), and the sealing ring (31) is used to prevent the gas inside the first chamber (11) and the second chamber (12) from leaking into the slot (8).