Ultralow-temperature wedge gate valve

Abstract

The invention relates to an ultralow-temperature wedge gate valve, which relates to the technical field of gate valves, and comprises a valve body, a valve rod, a valve plate, a vibration ice breaking assembly and a scouring ice breaking assembly, a resonance rod of the vibration icebreaking assembly is connected with a valve plate and a valve seat, and a clamping jaw on the resonance rod is meshed with a driving gear ring on a valve rod. A mounting ring of the scouring ice breaking assembly is connected with the valve plate, a scouring groove of a variable-pitch spiral structure is formed in the mounting ring, the pitch from an inlet to an outlet is increased by 2-4 times, and a metal sheet is inserted into the mounting ring and located at the inlet or the outlet of the scouring groove. Ice blocks in the gate valve in the ultralow-temperature environment are effectively broken, normal use of the gate valve is prevented from being affected by the ice blocks, and reliable operation of the gate valve is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of gate valve technology, and in particular to an ultra-low temperature wedge gate valve. Background Art

[0002] A cryogenic gate valve is a valve used to control fluid flow in cryogenic environments. It typically consists of a valve body, seals, and an operating mechanism. As an important fluid control device, cryogenic gate valves are widely used in industries such as liquefied natural gas, aerospace, nuclear energy, metallurgy, and the chemical industry.

[0003] When the wedge gate valve is used in an ultra-low temperature environment or a low temperature environment, the valve seat is easily frozen, resulting in the formation of an ice film on the valve seat surface, thereby reducing the sealing performance of the valve seat. Summary of the Invention

[0004] In order to increase the sealing performance of the valve seat, the present application provides an ultra-low temperature wedge gate valve.

[0005] An ultra-low temperature wedge gate valve, comprising a valve body, a valve stem, a valve plate, a valve seat provided on the valve plate, a vibration ice-breaking component, and a flushing ice-crushing component; The vibration ice breaking components include: A resonance rod is connected to the valve plate, a claw is connected to the resonance rod, and the other end of the resonance rod is connected to the valve seat; A driving gear ring is connected to the valve stem, and the driving gear ring is engaged with the claw; The flushing ice crushing kit includes: The mounting ring is connected to the valve plate and is provided with a flushing groove. The flushing groove is a variable pitch spiral structure, and its pitch increases 2-4 times from the inlet to the outlet of the flushing groove; The metal sheet is bent and inserted into the entrance of the mounting ring at the scouring trough.

[0006] By adopting the above technical solution, the engagement of the driving gear ring and the claw in the vibration ice-breaking assembly can convert the rotational kinetic energy of the valve stem into impact kinetic energy and transmit it to the resonance rod, causing the valve seat to vibrate and breaking the ice film covering the surface of the valve seat; the flushing ice-crushing assembly uses the flushing groove with a variable pitch spiral structure on the mounting ring to form a low pressure at the outlet of the flushing groove, sucking in the broken and floating ice on the valve seat and further crushing it, avoiding the ice film from remaining on the valve seat, and the metal sheet can prevent ice from forming at the entrance of the flushing groove.

[0007] Optionally, the resonance rod is in a cone shape, the small end of the resonance rod is inserted into the valve seat, and the large end area / small end area is ≥5:1.

[0008] By adopting the above technical solution, a vibration ice-breaking assembly and a flushing ice-crushing assembly are installed in the ultra-low-temperature wedge gate valve, enhancing valve seat sealing. The structure connecting the resonant rod to the valve plate and valve seat, and the drive ring to the valve stem and claw, converts the rotational kinetic energy of the rotating rod into impact kinetic energy and transmits it to the resonant rod. The resonant rod is truncated in shape, with the small end inserted into the valve seat and the large-end to small-end area ratio being ≥5:1. This ensures that the impact force output at the small end of the resonant rod is several times that of the impact force at the large end, thereby increasing ice-breaking efficiency.

[0009] Optionally, the claw includes a curved portion and a fixed portion, the fixed portion of the claw is connected to the large end of the resonance rod, the curved portion of the claw is engaged with the driving gear ring, and the surface of the engagement portion of the curved portion of the claw is provided with a rounded sliding surface.

[0010] By adopting the above technical solution, the fixed part of the claw is connected to the large end of the resonance rod, and the bent part is engaged with the driving gear ring, which can convert the rotational kinetic energy of the rotating rod into impact kinetic energy and transmit it to the resonance rod; a rounded sliding surface is provided on the surface of the engagement of the bent part, which can make the bent part of the claw slide smoothly along the tooth convexity of the driving gear ring, facilitate the deformation, bending, compression and release of the bent part, cooperate with the vibration ice breaking component and the flushing ice crushing component to increase the sealing of the valve seat.

[0011] Optionally, the valve stem includes a fixed seat and a rotating rod, the fixed seat and the rotating rod are rotatably connected, the drive gear ring is axially sleeved on the rotating rod, the resonance rod is connected to the support rod, and the support rod is connected to the fixed seat.

[0012] By adopting the above technical solution, the driving gear ring is axially sleeved on the rotating rod, and the rotation of the rotating rod can be used to drive the driving gear ring to rotate; the resonance rod is connected to the fixed seat through the support rod, ensuring that when the rotating rod rotates, the rotational kinetic energy can be effectively transmitted to the resonance rod through the driving gear ring and the claw, so as to realize the normal operation of the vibration ice-breaking assembly, help to break the ice film on the surface of the valve seat, thereby increasing the sealing of the valve seat, and avoiding the displacement of the resonance rod position.

[0013] Optionally, the tooth protrusions on the driving gear ring are asymmetrically arranged, and a gap is provided between two adjacent tooth protrusions.

[0014] By adopting the above technical solution, the asymmetrically arranged tooth protrusions of the drive gear ring can adapt to specific movement requirements and facilitate the coordinated movement of the claws; the gaps set between adjacent tooth protrusions can prevent the tooth protrusions on the drive gear ring from being damaged when they shrink in a low temperature environment.

[0015] Optionally, the inlet aperture of the scouring trough is smaller than the outlet aperture, and a speed-increasing ring is connected to the inner wall of the scouring trough between the inlet and the outlet. The inner diameter of the speed-increasing ring is smaller than the inlet aperture of the scouring trough, and the speed-increasing ring and the inner wall of the scouring trough have a smooth transition.

[0016] By adopting the above technical solution, when the liquid flows to the mounting ring and flows in from the flushing groove inlet, low pressure is formed at the flushing groove outlet, and the broken and floating ice on the valve seat is sucked into the flushing groove, and the ice is further broken through the flushing groove. At the same time, the speed-increasing ring can accelerate the flow rate of the liquid, and the smooth transition inner wall can ensure smooth liquid flow.

[0017] Optionally, a plurality of protrusions are integrally formed on the inner wall between the speed increasing ring and the outlet of the scouring groove, and the arrangement direction of the protrusions is opposite to the spiral extension direction of the scouring groove.

[0018] By adopting the above technical solution, a protrusion is set on the inner wall between the speed-increasing ring and the outlet of the flushing groove, and the arrangement direction is opposite to the spiral extension direction of the flushing groove, which can form a reverse turbulence on the liquid flowing into the flushing groove, thereby improving the ice crushing efficiency and reducing the flow rate of the liquid.

[0019] Optionally, three scouring grooves are provided, and the three scouring grooves are arranged equidistantly around the circumference. The inlet of the scouring groove is provided on the side of the mounting ring away from the valve plate, and the outlet of the scouring groove is provided on the other side of the mounting ring. The outlet of the scouring groove is configured to be trumpet-shaped.

[0020] By adopting the above technical solution, three circumferentially equidistantly arranged flushing grooves can evenly absorb and further crush the broken and floating ice on the valve seat; the flushing groove inlet is opened on the side of the mounting ring away from the valve plate, and the outlet is opened on the other side of the mounting ring, which is conducive to the flow of liquid along a specific path and the ice on the valve seat is sucked into the flushing groove; the flushing groove outlet is set to be trumpet-shaped, which can reduce the flow rate of the liquid after flowing out of the flushing groove, thereby avoiding the formation of vortexes in the valve body.

[0021] Optionally, the metal sheet is composite-rolled from a brass layer and a low-carbon steel layer, and the brass layer of the metal sheet is connected to the mounting ring.

[0022] By adopting the above technical solution, the gate valve has a vibrating ice-breaking component and a flushing ice-crushing component. The vibrating ice-breaking component uses the resonance rod and the drive gear ring to make the valve seat vibrate to break the ice film. The flushing ice-crushing component further crushes the broken ice film through the flushing groove on the mounting ring to avoid residue; the metal sheet is composite-rolled with a brass layer and a low-carbon steel layer, and the brass layer is connected to the mounting ring. In a low-temperature environment, the metal sheet will deform due to the low-temperature expansion difference between the brass layer and the steel layer, which can expand the entrance of the flushing groove and avoid ice formation at the entrance of the flushing groove.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The vibration ice breaking component causes the valve seat to vibrate, breaking the ice film covering the valve seat surface and increasing the ice breaking efficiency; 2. Flushing the ice crushing component can further shatter the broken ice film and prevent the ice film from remaining on the valve seat; 3. The metal sheet deforms in a low temperature environment, which can expand the entrance of the scouring trough to prevent ice from forming at the entrance of the scouring trough. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of this application; Figure 2 It is a schematic diagram of the exploded structure of the present application, mainly showing the valve stem; Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A; Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the AA plane; Figure 5 It is a schematic diagram of the structure of the mounting ring and valve seat in this application; Figure 6 It is a structural diagram of the mounting ring and valve seat in this application, mainly showing the outlet of the scouring groove; Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure along the BB surface.

[0025] Description of the drawings: 1. Valve body; 2. Valve stem; 201. Fixed seat; 202. Rotating rod; 3. Valve plate; 4. Valve seat; 5. Vibrating ice-breaking assembly; 501. Buffer sleeve; 502. Drive gear ring; 503. Buffer block; 504. Resonance rod; 505. Claw; 506. Support rod; 6. Flush ice-breaking assembly; 601. Mounting ring; 602. Flush groove; 603. Speed ​​increasing ring; 604. Bump; 605. Metal sheet; 606. Mounting frame; 7. Mounting groove; 8. Give way groove; 9. Inlet; 10. Outlet. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 -Attached Figure 7 , further details of this application are given.

[0027] A cryogenic wedge gate valve, Figure 1 、 Figure 2 , including a valve body 1, a valve stem 2, and a valve plate 3. The valve plate 3 is connected to a valve seat 4 on both sides. It also includes a vibration ice-breaking component 5 and a flushing ice-crushing component 6. The vibration ice-breaking component 5 causes the valve seat 4 to vibrate, so that the ice film covering the surface of the valve seat 4 is broken; the flushing ice-crushing component 6 is used to further crush the broken ice film and prevent the ice film from remaining on the valve seat 4.

[0028] Reference Figure 2 、 Figure 3A mounting groove 7 is provided on the valve plate 3, and the valve stem 2 includes a fixed seat 201 installed in the mounting groove 7. The inner wall of the mounting groove 7 abuts against the outer wall of the fixed seat 201, and the part of the fixed seat 201 outside the mounting groove 7 is rotatably connected to a rotating rod 202. The staff controls the opening or closing of the gate valve by driving the rotation of the rotating rod 202.

[0029] Reference Figure 3 The surface of the rotating rod 202 is axially covered with a buffer sleeve 501, and a drive gear ring 502 is axially mounted on the outer surface of the buffer sleeve 501. The teeth of the drive gear ring 502 are asymmetrically arranged, and the side of the teeth that rotates in the same direction as the rotating rod 202 is configured as an inclined sliding surface. At the same time, a low-temperature gap of 0.1mm-0.2mm is provided between the teeth of two adjacent drive gear rings 502 to prevent damage to the teeth of the drive gear rings 502 when they shrink in low-temperature environments. In addition, the tips of the teeth of the drive gear ring 502 are configured as rounded corners to reduce friction during rotation of the drive gear ring 502.

[0030] Reference Figure 3 、 Figure 4 The valve plate 3 is provided with four lateral clearance grooves 8, arranged in pairs, symmetrically on both sides of the fixed seat 201. The lateral clearance grooves 8 penetrate the valve plate 3 and communicate with the valve seat 4. The valve seat 4 has a buffer block 503 disposed within the lateral clearance grooves 8. A resonant rod 504 is slidably connected to each lateral clearance groove 8, where the resonant rod 504 abuts against the buffer block 503.

[0031] The resonance rod 504 is made of 304 stainless steel, which has an impact toughness of approximately 120 J / cm² at -196°C. Furthermore, the resonance rod 504 is truncated in shape, with its small end extending into the clearance groove 8 and abutting against the valve seat 4. The diameter of the large end of the resonance rod 504 is 8 mm, and the diameter of the small end is 3 mm. The ratio of the large end area to the small end area of ​​the resonance rod 504 is approximately 7.11.

[0032] Reference Figure 3The large end surface of the resonance rod 504 is fixedly connected with a claw 505, wherein the claw 505 includes a fixed portion and a bent portion. The fixed portion of the claw 505 is fixedly connected to the large end surface of the resonance rod 504, the bent portion of the claw 505 is engaged with the driving gear ring 502, and the side thereof in contact with the driving gear ring 502 is set as a sliding surface with rounded corners. When the rotating rod 202 rotates, the curved portion of the claw 505 slides along the tooth protrusion of the driving gear ring 502, and the curved portion of the claw 505 gradually bends and compresses. After the rotating rod 202 continues to rotate, the curved portion of the claw 505 deforms, bends, releases, and strikes the surface of the driving gear ring 502, thereby converting the rotational kinetic energy of the rotating rod 202 into impact kinetic energy and transmitting it to the resonance rod 504. According to Pascal's law, the pressure transmitted by the solid remains unchanged in a closed system, and the force is proportional to the effective area, that is: F output = F input × (A small end / A large end), so that the impact force output at the small end of the resonance rod 504 is approximately 7.11 times the impact force received at the large end, thereby increasing the ice-breaking efficiency.

[0033] Reference Figure 3 、 Figure 4 The resonance rod 504 is fixedly connected to a support rod 506 on the surface outside the clearance groove 8, and the support rod 506 is fixedly connected to the fixing seat 201, thereby enhancing the stability of the resonance rod 504 and making the resonance rod 504 more reliable during operation.

[0034] Reference Figure 3 、 Figure 5 、 Figure 6 The flushing and ice-crushing assembly 6 includes a mounting bracket 606 fixedly connected to the valve plate 3, a mounting ring 601 fixedly connected to the mounting bracket 606, and an outer ring of the mounting ring 601 is fixedly connected to the inner surface of the valve seat 4, and the mounting ring 601 is integrally injection-molded. At the same time, the mounting ring 601 is provided with three flushing grooves 602 equidistantly arranged along the circumference of the mounting ring 601 away from the fixed seat 201, wherein the flushing groove 602 is a variable-pitch spiral structure, and an inlet 9 of the flushing groove 602 is provided on a side of the mounting ring 601 away from the valve plate 3, and an outlet 10 of the flushing groove 602 is provided on the other side of the mounting ring 601.

[0035] Reference Figure 5 、 Figure 6 、 Figure 7 The diameter of the inlet 9 of the scouring groove 602 and the outlet 10 of the scouring groove 602 are trumpet-shaped, and the inner wall of the scouring groove 602 is integrally formed with a speed increasing ring 603, and the inner diameter of the speed increasing ring 603 is smaller than the aperture of the inlet 9 of the scouring groove 602, and the aperture of the inlet 9 of the scouring groove 602 is smaller than the aperture of the outlet 10 of the scouring groove 602.

[0036] Reference Figure 1 、 Figure 6 、 Figure 7When the liquid flows to the mounting ring 601 and flows into the inlet 9 of the flushing groove 602 on the mounting ring 601, the liquid forms a low pressure at the outlet 10 of the flushing groove 602, thereby sucking the broken and floating ice on the valve seat 4 into the flushing groove 602, and further breaking the ice by passing through the flushing groove 602. The flow rate of the liquid is reduced after flowing out of the flushing groove 602, so as to avoid the formation of vortex in the valve body 1.

[0037] It should be noted that the scouring groove 602 includes a tapered section between the inlet 9 and the speed-increasing ring 603, a speed-increasing ring section, a speed-increasing section at the speed-increasing ring 603, and a gradually expanding section between the speed-increasing section and the outlet 10. Moreover, when the diameter of the mounting ring 601 is 100 mm, the thickness is 12 mm, and the external liquid flow rate is 1 m / s, the aperture of the inlet 9 of the scouring groove 602 is 6 mm, the pitch of the tapered section gradually changes from 18 mm to 6 mm, the number of turns is 0.3, the height is 4 mm, the base circle diameter is 75 mm, and the inner diameter of the speed-increasing ring 603 is 3.5 mm, and the internal aperture of the scouring groove 602 is gradually and smoothly reduced from 6 mm to 3.5 mm. At this time, the liquid flow rate gradually increases to 6 m / s; the pitch in the speed-increasing section and the speed-increasing ring 603 is constant at 6 mm, and the height is 4 mm. The pitch of the gradually expanding section gradually changes from 6mm to 15mm, the height is 7mm, the number of turns is 0.7 turns, the base circle diameter changes from 75mm to 60mm, the outlet aperture of the scouring groove 602 is 10mm, and the internal aperture of the scouring groove 602 gradually and smoothly expands from 3.5mm to 10mm, and the liquid flow rate gradually decreases to 1m / s.

[0038] Reference Figure 5 、 Figure 6 、 Figure 7 The flushing groove 602 has a plurality of spirally arranged protrusions 604 integrally formed on the inner wall of the gradually expanding section. The spiral arrangement of the protrusions 604 is opposite to the spiral extension direction of the flushing groove 602, creating a reverse flow disturbance for the liquid flowing into the flushing groove 602, thereby improving ice crushing efficiency and reducing the liquid flow rate. The protrusions 604 can also be replaced with raised ribs, which can also provide a flow disturbance function.

[0039] The mounting ring 601 is provided with a bent metal sheet 605 at the entrance 9 of the scouring groove 602. The metal sheet 605 is formed by laminating and rolling brass-mild steel-brass-mild steel-brass. The total thickness of the brass layer is 0.9 mm, the total thickness of the steel layer is 0.6 mm, and the low-temperature expansion difference between the brass layer and the steel layer is within 5×10⁻. 6 / °C, causing metal sheet 605 to deform in a low-temperature environment, thereby expanding inlet 9 of scouring groove 602 to prevent ice from forming at inlet 9 of scouring groove 602. The brass layer also directs the deformation during this process. Alternative materials for metal sheet 605 can include other metal composite materials with different thermal expansion coefficients, as long as they can achieve similar deformation due to temperature changes.

[0040] The operating principle of this embodiment is as follows: in an ultra-low temperature environment, when a worker rotates the rotating rod 202 of the valve stem 2, the rotating rod 202 drives the driving gear ring 502 to rotate. The driving gear ring 502 engages with the claw 505, causing the curved portion of the claw 505 to deform and release. This converts rotational kinetic energy into impact kinetic energy and transmits it to the resonance rod 504. The resonance rod 504 transmits vibrations to the valve seat 4, causing the ice film on the surface of the valve seat 4 to break up. Simultaneously, liquid flows through the scouring groove 602 of the mounting ring 601. The speed increasing ring 603 and the protrusion 604 further shatter and remove the broken ice film, preventing any residual ice film. Furthermore, the deformation of the metal sheet 605 at low temperatures prevents ice from forming at the inlet 9 of the scouring groove 602. Compared with the traditional single protection method, this method of combining vibration and flushing solves the problem of ice film on the valve seat 4 of the ultra-low temperature wedge gate valve from multiple aspects, greatly improves the sealing performance of the valve seat 4, meets the high requirements of industrial production on the sealing performance of the gate valve in ultra-low temperature environment, and makes significant improvements and contributions to the existing technology.

[0041] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A cryogenic wedge gate valve, comprising a valve body (1), a valve stem (2), and a valve plate (3), wherein a valve seat (4) is provided on the valve plate (3), and characterized in that: It also includes a vibration ice-breaking component (5) and a flushing ice-crushing component (6); The vibration ice-breaking component (5) comprises: A resonance rod (504) is connected to the valve plate (3), the resonance rod (504) is connected to a claw (505), and the other end of the resonance rod (504) is connected to the valve seat (4); A driving gear ring (502) is connected to the valve stem (2), and the driving gear ring (502) is engaged with a claw (505); The flushing and ice-crushing assembly (6) comprises: A mounting ring (601) is connected to the valve plate (3). A flushing groove (602) is provided on the mounting ring (601). The flushing groove (602) is a variable pitch spiral structure, and its pitch increases by 2-4 times from the inlet (9) to the outlet (10) of the flushing groove (602); The metal sheet (605) is bent and inserted into the inlet (9) of the scouring groove (602) of the mounting ring (601).

2. The ultra-low temperature wedge gate valve according to claim 1, characterized in that: The resonance rod (504) is in a pyramidal shape, the small end of the resonance rod (504) is inserted into the valve seat (4), and the large end area / small end area is ≥5:

1.

3. The ultra-low temperature wedge gate valve according to claim 2, characterized in that: The clamping claw (505) comprises a curved portion and a fixed portion, wherein the fixed portion of the clamping claw (505) is connected to the large end of the resonance rod (504), the curved portion of the clamping claw (505) is engaged with the driving gear ring (502), and the surface of the engagement portion of the curved portion of the clamping claw (505) is provided with a rounded sliding surface.

4. The ultra-low temperature wedge gate valve according to claim 1, characterized in that: The valve stem (2) comprises a fixed seat (201) and a rotating rod (202), wherein the fixed seat (201) and the rotating rod (202) are rotatably connected, the driving gear ring (502) is axially sleeved on the rotating rod (202), and the resonance rod (504) is connected to a support rod (506), and the support rod (506) is connected to the fixed seat (201).

5. The ultra-low temperature wedge gate valve according to claim 1, characterized in that: The tooth protrusions on the driving gear ring (502) are asymmetrically arranged, and a gap is provided between two adjacent tooth protrusions.

6. The ultra-low temperature wedge gate valve according to claim 1, characterized in that: The aperture of the inlet (9) of the scouring groove (602) is smaller than the aperture of the outlet (10); a speed-increasing ring (603) is connected to the inner wall of the scouring groove (602) between the inlet (9) and the outlet (10); the inner diameter of the speed-increasing ring (603) is smaller than the aperture of the inlet (9) of the scouring groove (602); and the speed-increasing ring (603) and the inner wall of the scouring groove (602) are smoothly transitioned.

7. The ultra-low temperature wedge gate valve according to claim 6, characterized in that: A plurality of protrusions (604) are integrally formed on the inner wall between the speed increasing ring (603) and the outlet (10) of the scouring groove (602), and the arrangement direction of the protrusions (604) is opposite to the spiral extension direction of the scouring groove (602).

8. The ultra-low temperature wedge gate valve according to claim 6, characterized in that: There are three flushing grooves (602), which are arranged equidistantly around the circumference. The inlet (9) of the flushing groove (602) is opened on the side of the mounting ring (601) away from the valve plate (3), and the outlet (10) of the flushing groove (602) is opened on the other side of the mounting ring (601). The outlet (10) of the flushing groove (602) is configured to be trumpet-shaped.

9. The ultra-low temperature wedge gate valve according to claim 1, characterized in that: The metal sheet (605) is composite-rolled from a brass layer and a low-carbon steel layer, and the brass layer of the metal sheet (605) is connected to the mounting ring (601).

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