Large-caliber high-temperature blind plate valve

Abstract

The invention relates to a large-diameter high-temperature blind plate valve which is mainly composed of a valve plate, a valve frame, a floating end flange assembly, a fixed end flange assembly, a fixed disc, a rotating disc, a thrust disc, a loosening and clamping executing mechanism and a walking executing mechanism. The valve plate is driven by the walking executing mechanism to achieve switching between a through position and a blind position, the whole valve is of an assembled structure, manufacturing is easy and convenient, different working conditions can be met through free combination of materials of all components, and universality is high; the sealing piece can achieve free switching of soft sealing and hard sealing, all-position locking of a sealing part can be achieved, and the sealing effect is good; action interlocking is arranged between the valve loosening and clamping executing mechanism and the walking mechanism, so that the safety is high; according to the blind plate valve, on-off switching of a medium pipeline can be achieved under the severe working condition, the actual production efficiency is improved, and the danger coefficient of a device is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of blind plate valves, and in particular to a large-caliber high-temperature blind plate valve. Background Art

[0002] In petroleum and chemical industries such as petrochemical oil and gas lines and maleic anhydride unit pipelines, blind plates are often installed in pipelines due to process conditions. Traditional pipeline switching requires manual disassembly and switching, which is complicated and time-consuming. For pipelines under high temperature, high pressure, flammable, explosive or toxic media conditions, especially large-diameter pipelines under complex conditions, manual disassembly and installation have a high risk factor. In order to facilitate the control of pipeline on and off, related industries install blind plate valves at the positions where blind plates are required, and use motors, hydraulics and other driving methods to achieve pipeline switching. However, existing blind plate valves have problems such as low applicable pressure and temperature, complex structure, and unreliable sealing.

[0003] For example, the split horizontal blind plate valve disclosed in Chinese patent CN 201561142 U is a large-diameter frame-type blind plate valve, which is suitable for low-temperature and low-pressure pipelines, but not suitable for harsh working conditions such as high temperature and toxic conditions.

[0004] Patent CN107269868A discloses an electric high-temperature water-cooled blind plate valve, which is a fan-shaped blind plate valve with a three-point clamping structure. It protects the sealing surface by circulating water, requires additional water supply, adds a water circulation system, and increases the complexity of the equipment. When used in large-diameter high-temperature pipelines, the sealing surface protection effect is weakened, which can easily reduce the actual sealing effect.

[0005] Patent CN118856020A discloses a multi-point supported gate valve, which is a multi-point clamping frame-type blind plate valve. The clamping points are increased, the sealing effect is improved, and the adaptability to large-diameter pipelines is increased. However, the gear meshing structure tends to increase the overall size of the valve, reducing the adaptability of the device to confined spaces. In addition, the multi-point gears are subjected to uneven force, and due to the influence of factors such as gear side clearance, it is difficult to ensure synchronous locking of multiple points. The sealing force still has the characteristic of uneven circumferential distribution, and the difficulty of processing, manufacturing and debugging is increased.

[0006] There is also an electric blind plate valve (CN204784961U), an electric push rod fan-shaped blind plate valve (CN 206802436 U) and other patents, all of which are fan-shaped blind plate valves, which achieve three-point clamping through cranks and other forms. The sealing force is unevenly distributed in the circumferential direction (largest at three points), and the three-point clamping force is inconsistent. As the diameter becomes larger and the temperature rises, the above-mentioned sealing shortcomings become more prominent and the risk of leakage increases. Summary of the invention

[0007] In view of the defects of the prior art, the present invention proposes a large-diameter high-temperature blind plate valve for realizing the on-off switching of medium pipelines under harsh working conditions such as high temperature, explosiveness, and toxicity, thereby improving actual production efficiency and reducing the risk factor of the device.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: A large-caliber, high-temperature blind plate valve comprises a valve plate, a valve body and an electric actuator, wherein the valve body comprises a valve frame, a floating end flange assembly and a fixed end flange assembly installed at both ends of the valve frame, a valve plate space is formed between the floating end flange assembly and the fixed end flange assembly for installing the valve plate, the valve plate comprises a rectangular outer frame and a through-position ring and a blind-position plate arranged in the outer frame, a rotating disk assembly is arranged outside the floating end flange assembly, and the electric actuator comprises a loosening and clamping actuator and a walking actuator arranged on a bracket, the loosening and clamping actuator drives the rotating disk assembly to push the floating end flange assembly to expand and contract along the axial direction of the flow channel to achieve clamping and loosening of the valve plate, and the walking actuator is used to drive the valve plate to move in a direction perpendicular to the flow channel to achieve switching between the through position and the blind position of the valve plate.

[0009] Furthermore, the valve frame is an integrated assembled structure, including a front frame plate, a rear frame plate and a side plate, the front frame plate and the rear frame plate are connected by a plurality of connecting shafts, the side plates are installed on both sides of the front frame plate and the rear frame plate, the floating end flange assembly is installed at one end of the valve frame close to the front frame plate, including a floating end connecting flange, a bellows and a pressure plate, the fixed end flange assembly is installed at one end of the valve frame close to the rear frame plate, including a fixed end connecting flange and a fixed valve seat, the fixed end flange assembly and the movable end flange assembly are in a flange-type bolted relationship with the valve frame, and the valve plate space for installing the valve plate is formed between the fixed valve seat and the pressure plate.

[0010] Furthermore, the rotating disk assembly includes a fixed disk, a rotating disk and a thrust disk which are sleeved on the outside of the pressure plate, wherein the inner hole of the fixed disk cooperates with the pressure plate and is provided with an anti-rotation key, one end of the fixed disk has an outer flange, the outer flange is fixedly connected to the front frame plate, the outer circle of the small end of the fixed disk is screwed together with the inner hole of the rotating disk by a thread, an inner flange is provided at the end of the rotating disk away from the fixed disk, a groove corresponding to the inner flange is provided on the pressure plate, a thrust disk is provided on the side adjacent to the inner flange of the rotating disk, and the thrust disk is fixedly connected to the pressure plate.

[0011] Furthermore, the thrust plate is composed of a petal ring and a locking ring. The inner side of the petal ring is embedded in the pressure plate, and the outer side of the petal ring is fixedly connected to the locking ring. The locking ring is sleeved on the outside of the pressure plate and is adjacent to the inner flange of the rotating plate. An anti-rotation key is arranged between the locking plate and the pressure plate.

[0012] Furthermore, the loosening and clamping actuator includes an electric device, a screw and a slider arranged on a bracket, the slider is screwed together with the screw, sliding shafts are provided on both sides of the slider and are guided by sliding grooves on the bracket, a swing arm is fixed on the outer peripheral surface of the rotating disk, a waist-shaped hole is provided on the swing arm and is movably connected to the sliding shaft, the electric device outputs torque and transmits it through the screw, driving the slider to translate, and the slider drives the swing arm to swing, thereby converting the translational motion of the slider into the rotational motion of the rotating disk, thereby realizing the extension and retraction of the pressure plate along the axial direction of the flow channel.

[0013] Furthermore, the walking actuator includes an electric device and a gear shaft. A groove is arranged on the top of the rectangular outer frame of the valve plate, and a rack is built into the groove. The walking actuator drives the gear shaft to rotate by outputting torque through the electric device, and then realizes the translational movement of the valve plate under the meshing action of the gear and the rack.

[0014] Furthermore, a compression spring and a shift fork are arranged on the connecting shaft near the center of the valve frame, and the compression spring and the shift fork are sleeved on the connecting shaft. The shift fork is a sleeve-shaped structure sleeved on the outside of the compression spring and provided with an inner retaining edge at one end. The compression spring is installed in a pre-stressed state, and the force point at one end of the compression spring is the rear valve frame, and the force point at the other end is the inner retaining edge of the shift fork. A guide groove is provided on the outer peripheral surface of the shift fork, and the rectangular outer frame of the valve plate is located in the guide groove. The compression spring and the shift fork are used to push the valve plate away after the pressure plate is loosened, so that the valve plate maintains a certain gap with the fixed valve seat.

[0015] Furthermore, a supporting roller or a straightening roller is provided on the connecting shaft near the edge of the valve frame, and the supporting roller and the straightening roller both have built-in bearings and are sleeved on the connecting shaft, wherein the supporting roller is located below the valve plate, and is used to support the valve plate, and rotates synchronously when the valve plate moves to reduce walking resistance; the straightening roller is located above the valve plate, and the straightening roller corresponds to the upper frame of the valve plate and is provided with an annular groove for avoiding the rack, which can avoid the valve plate from tilting when in the target position and ensure smoothness in the starting stage of the walking process.

[0016] Furthermore, the through position and blind position of the valve plate are respectively provided with sealing grooves on the annular surfaces corresponding to the pressure plate and the fixed valve seat, and a sealing member is provided in the sealing groove, and the sealing member is a rubber pad, a metal pad, or a metal + non-metal composite pad.

[0017] Furthermore, an action interlock is provided between the loosening and clamping actuator and the traveling actuator. When the loosening is not in place, the valve plate cannot travel, and when the valve plate is not switched into place, the loosening and clamping actuator cannot clamp.

[0018] The present invention has at least the following beneficial effects: 1. The blind plate valve of the present invention adopts an assembled structure as a whole, which is simple in structure and convenient to manufacture. The valve frame is composed of a front / rear frame plate and a connecting shaft. The fixed end flange assembly and the movable end flange assembly are flange-bolted to the valve frame. According to the different process media in the pipeline, the use requirements of different media conditions can be met by simply adjusting the materials of the fixed end flange assembly, the floating end flange assembly and the valve plate channel ring; the valve as a whole is an assembled structure, and the materials of each component can be freely combined without changing the valve structure and parameters to meet different working conditions, and the versatility is stronger.

[0019] 2. The present invention designs a rotating disc clamping structure, which is composed of a fixed disc, a rotating disc and a thrust disc. Under the drive of the clamping and releasing actuator, the rotating disc is driven by the lead screw and the slider to rotate, and the pressure plate of the floating end flange assembly is pushed to move axially through the threaded engagement to achieve the clamping or loosening of the valve plate. The rotating disc achieves axial movement through the threaded engagement, so that the sealing force is evenly distributed around the pressure plate. Compared with the existing three-point clamping, gear push rod locking and other clamping methods, it can ensure the full-position locking of the sealing part, the sealing effect is reliable, and the structure is simple and easy to assemble. It is suitable for large-caliber and high-temperature and high-pressure working environments.

[0020] 3. The valve plate of the present invention is mainly composed of a rectangular outer frame, a through-position ring and a blind-position plate welded together. A groove is arranged on the top of the outer frame, and a rack is built in the groove. Through the cooperation of the gear rack, the valve plate moves vertically along the flow channel under the drive of the walking actuator. Sealing grooves are respectively arranged on the annular surfaces corresponding to the pressure plate and the fixed valve seat. The sealing ring is embedded in the sealing groove. When facing different process media, the material and type of the sealing ring can be changed to realize free switching between soft and hard seals, and the adaptability is higher. After the valve plate completes the open position (or closed) switching, the closed position (or open position) is moved out of the valve frame, which can facilitate the replacement of seals or cleaning / washing of sealing parts.

[0021] 4. The present invention designs a compression spring fork structure and a roller structure on the connecting shaft of the valve frame. When the pressure plate loosens the valve plate, the valve plate is pushed open through the cooperation of the compression spring and the fork so that a gap is maintained between it and the fixed valve seat and the pressure plate on both sides, thereby ensuring smooth movement of the valve plate and protecting the sealing surface and the seal; the roller can reduce the movement resistance of the valve plate and ensure smoothness of the starting of movement.

[0022] 5. An action interlock is set between the loosening and clamping actuator and the traveling mechanism of the present invention. When the loosening is not in place, the valve plate cannot travel. When the valve plate is not switched into place, the loosening and clamping actuator cannot clamp, thereby protecting related components and ensuring the overall safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the overall structure diagram of the blind plate valve; Figure 2 It is a partial cross-sectional structural diagram of the blind plate valve; Figure 3 This is a cross-sectional view of the blind plate valve in the closed position and clamped state; Figure 4 This is a cross-sectional view of the blind plate valve in the open and loose state; Figure 5 Schematic diagram of the valve plate structure; Figure 6 It is a schematic diagram of the compression spring-shift fork structure; Figure 7 It is a schematic diagram of the partial structure of the loosening-clamping actuator; Figure 8 It is a schematic diagram of the connection relationship between the rotating disk and the slider; Fig. 9 It is a schematic diagram of the supporting roller and the straightening roller path; Fig.10 It is a schematic diagram of the structure of the walking actuator; Fig.11 This is the logic control diagram of the electric high-temperature blind plate valve.

[0024] Reference numerals: Valve body 1: valve frame 11, front frame plate 111, rear frame plate 112, side plate 113, connecting shaft 114, hole 1141, compression spring 115, shift fork 116, shift piece 1161, guide groove 1162, self-lubricating plate 1163, inner rib 1164, supporting roller 117, straightening roller 118; floating end flange assembly 12, floating end connecting flange 121, bellows 122, pressure plate 123, anti-rotation key 1 1232, anti-rotation key 2 1233, groove 1231, groove side 12311; Fixed end flange assembly 13, fixed end connecting flange 131, fixed valve seat 132; fixed disc 14, outer flange 141, small end outer ring 142, rotating disc 15, inner flange 151, inner flange end face 1511, swing arm 152, thrust disc 16, petal ring 161, locking ring 162, connecting bolt 163; Valve plate 2: through ring 21, blind plate 22, rectangular outer frame 23, groove 231, limit block 232, rack 24, sealing groove 25; Electric actuator 3: loosening and clamping actuator 31, traveling actuator 32, bracket 33, indicator plate 331, slide groove 332, screw rod 34, slider 35, sliding shaft 351, rolling sleeve 352, gear 36, gear shaft 37. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-10The present invention proposes a large-caliber high-temperature blind plate valve, which is mainly composed of a valve body 1, a valve plate 2 and an electric actuator 3, wherein the valve body 1 is composed of a valve frame 11, a floating end flange assembly 12, a fixed end flange assembly 13, a fixed plate 14, a rotating plate 15, a thrust plate 16, etc.; the electric actuator 3 is divided into a loosening and clamping actuator 31, a walking actuator 32 and a bracket 33, etc.

[0027] like Figure 1 As shown, the valve frame 11 is an integrated assembled structure, which is mainly composed of a front frame plate 111, a rear frame plate 112, a side plate 113 and a plurality of connecting shafts 114. The connecting shafts 114 cooperate with corresponding holes 1141 on the front frame plate 111 and the rear frame plate 112, and are locked on the outside by nuts. The side plates 113 are installed on the sides of the front frame plate 111 and the rear frame plate 112 to form a frame structure, providing a mounting base for other components.

[0028] The floating end flange assembly 12 and the fixed end flange assembly 13 are respectively installed at both ends of the valve frame 11. The floating end flange assembly 12 and the fixed end flange assembly 13 are respectively installed in the corresponding holes of the valve frame 11 and connected to the valve frame 11 by bolts, forming a flange-type bolted relationship with the valve frame 11.

[0029] Among them, the floating end flange assembly 12 is installed at one end close to the front frame plate 111, including a floating end connecting flange 121, a bellows 122 and a pressure plate 123, and the three are connected by welding; the fixed end flange assembly 13 is installed at one end close to the rear frame plate 112, and is composed of a fixed end connecting flange 131 and a fixed valve seat 132, and the two are connected by welding. After the floating end flange assembly 12 and the fixed end flange assembly 13 are connected to the valve frame 11, a valve plate space is formed between the pressure plate 123 and the fixed valve seat 132 for installing the valve plate 2.

[0030] like Figure 1-4 As shown, the fixed plate 14, the rotating plate 15 and the thrust plate 16 are respectively sleeved on the pressure plate 123, and the three constitute a rotating plate assembly, which can drive the pressure plate 123 to move along the axis of the flow channel under the drive of the loosening and clamping actuator 31 to achieve the clamping and loosening of the valve plate 2. The structure of the rotating plate assembly is specifically described below.

[0031] An outer flange 141 (forming a large end) is provided at one end of the fixed disk 14, and the outer flange 141 is connected to the front frame plate 111 through bolts after being matched, that is, the fixed disk 14 is fixed to the front frame plate 111 through bolts, and an outer circle 142 of the small end of the fixed disk 14 is provided with an external thread, and an inner hole of the rotating disk 15 is provided with an internal thread. The outer circle 142 of the small end of the fixed disk 14 is screwed together with the rotating disk 15 through threads, and under the action of the spiral rotation, the rotating disk 15 is extended and retracted along the axis direction of the flow channel.

[0032] Furthermore, the fixed disk 14 and the rotating disk 15 are screwed together using self-locking threads to stabilize the clamping torque, thereby ensuring the sealing performance of the valve after clamping and improving reliability.

[0033] The pressure plate 123 is provided with a groove 1231, and one end of the pressure plate 123 close to the bellows 122 cooperates with the inner hole of the fixed plate 14, and is provided with an anti-rotation key 1232, which can prevent the pressure plate 14 and the valve plate 2 from rotating relative to each other and damaging the sealing surface and the bellows 122.

[0034] The radial cross-section of the rotating disk 15 is "L"-shaped, that is, the rotating disk 15 is provided with an inner flange 151. When the rotating disk 15 retracts (i.e. moves toward the direction close to the fixed disk 14), the inner flange end face 1511 of the rotating disk 15 fits with the groove side face 12311 on the pressure plate 123, and the barbed pressure plate 123 moves the pressure plate 123 toward the front frame plate 111, thereby separating from the valve plate 2.

[0035] The thrust plate 16 is located on the side of the rotating plate 15 where the inner flange 151 is set, and is composed of a petal ring 161 and a locking ring 162. The inner side of the petal ring 161 is embedded in the pressure plate 123 to achieve axial positioning between the thrust plate 16 and the pressure plate 123. The outer side of the petal ring 161 is connected to the locking ring 162 by a connecting bolt 163. An anti-rotation key 1233 is set between the locking plate 162 and the pressure plate 123 to achieve circumferential positioning between the thrust plate 16 and the pressure plate 123 to prevent relative rotation. When the rotating plate 15 moves away from the fixed plate 14, the outer end surface of one end of the inner flange 151 of the rotating plate 15 is pressed against the locking ring 162, thereby pushing the thrust plate 16 to drive the pressure plate 123 to move toward the fixed valve seat 132, thereby clamping the valve plate 2.

[0036] like Figure 5 As shown, the valve plate 2 is welded by a rectangular outer frame 23, a through ring 21 and a blind plate 22. The blind plate 22 can be an integral plate or can be welded by a through ring 21+blind plate+rib plate. A groove 231 is arranged on the top of the rectangular outer frame 23. A rack 24 is built in the groove 231. Through the coordination of the gear and rack, the valve plate 2 can move in the direction perpendicular to the flow channel under the drive of the travel actuator 32.

[0037] The valve plate 2 is respectively provided with sealing grooves 25 (usually annular) at the annular surfaces corresponding to the pressure plate 123 and the fixed valve seat 132, and the sealing member is embedded in the sealing groove 25. The sealing groove 25 can be set to a rectangular groove surface type, a dovetail groove type or a ring connection surface type according to the type of sealing member adopted. Under the premise of meeting the valve performance, the sealing member in the sealing groove 25 can fully consider the sealing gasket types of various materials (such as rubber gaskets, metal gaskets, metal + non-metallic composite gaskets, etc.), realize soft, hard and other types of sealing, and can match the gasket according to the medium characteristics, with higher adaptability.

[0038] In the present invention, the valve open position corresponds to the valve open state, and the valve blind position corresponds to the valve closed state. After the valve plate 2 completes the open position (or closed) switching, the closed position (or open position) is moved out of the valve frame 11, so that the seal replacement or sealing part cleaning / washing work can be conveniently performed.

[0039] The front frame plate 111 and the rear frame plate 112 are connected by a plurality of connecting shafts 114. In this embodiment, Figure 1 As can be seen, there are a total of 8 connecting shafts 114, four of which are arranged at the top and four at the bottom. Among them, the connecting shaft 114 near the center of the valve frame 11 (see Figure 1 , which refers to the two connecting shafts on the inner side of the upper part and the two connecting shafts on the inner side of the lower part) are provided with a compression spring 115 and a shift fork 116, such as Figure 6 As shown (where Figure 6 (1) Yes Figure 3 The enlarged view of Y in the figure is a schematic diagram of the compression spring fork structure when the valve plate is clamped. Figure 6 (2) Yes Figure 4 The enlarged view at W in the figure is a schematic diagram of the compression spring fork structure when the valve plate is loosened). The compression spring 115 and the fork 116 are sleeved on the connecting shaft 114. The fork 116 is a sleeve-shaped structure, which is sleeved on the outside of the compression spring 115 and is provided with an inner retaining edge 1164 at one end. The compression spring 115 is installed in a pre-stressed state (the pre-stress is: n*the maximum sliding resistance of the valve plate, n≥1.5), and is compressed twice during the clamping process of the valve plate 2. The force point at one end of the compression spring 115 is the rear valve frame 112, and the force point at the other end is the inner retaining edge 1164 of the fork 116. A paddle 1161 is provided on the outer peripheral surface of the fork 116, and a guide groove 1162 is formed between the two paddles 1161. Self-lubricating plates 1163 are installed on the inner walls of both sides of the guide groove 1162 to provide a low-resistance guide function for the movement of the valve plate 2.

[0040] The rectangular outer frame 23 of the valve plate 2 is located in the guide groove 1162. After the clamping actuator 31 is released to execute the release command, the pressure plate 123 no longer provides clamping force to the valve plate 2. At this time, the internal force of the compression spring 115 is released, pushing the shift fork 116 to move along the axial direction of the connecting shaft 114, and then pushing the valve plate 2 away, so that the valve plate 2 and the fixed valve seat 132 maintain a certain gap S (that is, in the released position, a certain gap is reserved between the valve plate 2 and the fixed valve seat 132 and the pressure plate 123), thereby ensuring that the valve plate 2 moves smoothly and protecting the sealing surface and sealing components on the valve plate 2 to avoid wear of the sealing components and nearby components during the movement of the valve plate 2.

[0041] Furthermore, on the valve plate outer frame 23, a limit block 232 is provided on the travel track of the valve plate 2 (see Figure 1), after the valve plate 2 moves to the target position under the drive of the travel actuator 32, the limit block 232 contacts the shift piece 1161 in the shift fork 116 to limit the travel position of the valve plate 2.

[0042] like Fig. 9 As shown, the connecting shaft 114 (see Figure 1 , refers to the two connecting shafts located on the outside at the top and the two connecting shafts located on the outside at the bottom) are provided with supporting rollers 117 or straightening rollers 118, wherein the supporting roller 117 is provided on the connecting shaft 114 located below the valve plate 2, such as Fig. 9 As shown in (2), the supporting roller 117 is used to support the valve plate 2 and rotate synchronously when the valve plate 2 moves to reduce the walking resistance; the connecting shaft 114 above the valve plate 2 is provided with a straightening roller 118, as shown in Fig. 9 As shown in (1), the straightening roller 118 is provided with an annular groove for avoiding the walking mechanism (referring to the rack 24). The straightening roller 118 is used to prevent the valve plate 2 from tilting when in the target position state, thereby ensuring the smoothness of the starting stage of the walking process. The supporting roller 117 and the straightening roller 118 are both equipped with bearings and are sleeved on the connecting shaft 114.

[0043] like Figure 1 and Figure 7 As shown, the loosening and clamping actuator 31 is installed on the bracket 33, including an electric device, a screw 34 and a slider 35. The electric device outputs torque and transmits it through the screw 34. The screw 34 is threadedly connected to the slider 35 to drive the slider 35 to translate. Sliding shafts 351 are set on both sides of the slider 35, and a rolling sleeve 352 is set on the sliding shaft 351. A slide groove 332 is set on the side plate of the bracket 33. The slide groove 332 cooperates with the rolling sleeve 352 to provide a low-resistance guiding function for the slider 35. Furthermore, an indicator sign 331 is set on the outside of the slide groove 332 for indicating the release or clamping state.

[0044] like Figure 8 As shown, a swing arm 152 is fixed on the outer circumference of the rotating disk 15, and a waist-shaped hole is opened on the swing arm 152 of the rotating disk 15. The swing arm 152 is connected to the sliding shaft 351 on the slider 35 through the waist-shaped hole. When the slider 35 moves axially along the screw rod 34, it pushes the swing arm 152 to swing, thereby converting the translational motion of the slider 35 into the rotational motion of the rotating disk 15, thereby realizing the expansion and contraction of the pressure plate 123 along the axial direction of the flow channel. Figure 8 8a, 8b, and 8c respectively represent the connection relationship diagrams between the rotating disk 15 and the slider 35 when they are in the loose state, the middle position, and the locked state.

[0045] The matching hole between the swing arm 152 of the rotating disk 15 and the sliding shaft 351 in the sliding block 35 is a long waist-shaped hole, which can avoid jamming when the linear motion is converted into the rotational motion.

[0046] like Fig.10 As shown, the walking actuator 32 includes an electric device, a gear shaft 37 and a gear 36. The electric device outputs torque to drive the gear shaft 37 to rotate, and then the gear 36 and the rack 24 on the valve plate 2 mesh to achieve the translational movement of the valve plate 2. In particular, the rotation center of the gear shaft 37 and the installation center are eccentrically arranged to adjust the tooth side clearance of the gear rack, compensate for the micro-deformation caused by temperature change or other factors in disguised form, and ensure the smoothness of the walking process.

[0047] When the blind plate valve of the present invention is used, the fixed plate 14, the rotating plate 15, and the thrust plate 16 are first respectively sleeved on the outside of the pressure plate 123 of the floating end flange assembly 12, and then the fixed end flange assembly 13 and the floating end flange assembly 123 are respectively installed on the valve frame 11. The fixed plate 14 and the fixed end flange assembly 13 are connected to the valve frame 11 to become one body, and then the clamping actuator 31 is released to drive the rotating plate 15 to rotate. When the rotating plate 15 moves, it pushes the thrust plate 16 or the barbed pressure plate 123 to achieve the expansion and contraction of the pressure plate 123 along the axial direction of the flow channel, pressing or moving away from the valve plate 2, thereby achieving the clamping and loosening of the valve plate 2; and the valve plate 2 is driven by the walking actuator 32 to achieve the switching of the valve plate 2 through ring 21 and the blind plate 22.

[0048] In summary, the on-off valve (i.e., switching from open valve to closed valve) action process of the blind plate valve is as follows: the clamping actuator 31 is released to drive the screw rod 34, so that the slider 35 moves linearly along the axis of the screw rod 34, and the slider 35 drives the swing arm 152 on the rotating disk 15 to rotate and retract the rotating disk 15, and the inner flange 151 of the rotating disk 15 hooks the pressure plate 123 to keep the pressure plate 123 away from the valve plate 2. At the same time, the shift fork 116 pushes the valve plate 2 away by a certain distance (about half of the stroke of the pressure plate 123) under the action of the compression spring 115. This makes the two sides of the valve plate 2 in a non-contact state with the pressure plate 123 and the fixed valve seat 132, and then under the action of the walking actuator 32, the gear shaft 37 drives the gear 36 to rotate, so that the valve plate 2 performs a translational motion under the action of the rack 24. After reaching the closed position, the clamping actuator 31 is released to drive the rotating disk 15 to rotate and extend (i.e. move toward the direction close to the valve plate) through the screw rod 34 and the slider 35, pushing the thrust plate 16 forward, and the thrust plate 16 drives the pressure plate 123 forward until it is pressed against the valve plate 2, and the action is completed.

[0049] When switching from closing the valve to opening the valve, the valve plate 2 moves in the opposite direction, and the rest is the same as the above process.

[0050] Control method This blind plate valve can be connected to the DCS system (Distributed Control System) of the device to achieve external interlocking control, and can also achieve internal interlocking between the loosening, clamping and travel electric devices to ensure the safety of the valve and the device. The specific control logic is as follows Fig.11 As shown (valve opening action): After receiving the system permission command, start the valve opening knob, the system outputs the valve opening signal of the release-clamping electric head (i.e., the release clamping actuator), the valve performs the release action, when the release is in place, the valve opening signal of the release clamping electric head is off, the system outputs the valve opening signal of the travel electric head (i.e., the travel actuator), the valve performs the valve opening action, when the valve is in place, the valve opening signal of the travel electric head is off, the system outputs the valve closing signal of the release-clamping electric head, the valve performs the clamping action, when the clamping is in place, the valve closing signal of the release clamping electric head is off, and the process ends. By setting the action interlock, the valve plate cannot perform the travel action when the valve is not released in place, and the release clamping actuator cannot perform the clamping action when the valve plate is not switched in place, so as to protect the relevant components.

[0051] In the process, each action process can be interrupted by a stop signal. When the valve receives its own stop signal, the corresponding action signal is interrupted and the process stops, the system alarm indicator lights up, and the system prompts manual stop; when the valve receives an emergency stop signal, the corresponding action signal is interrupted and the process stops, the system alarm indicator lights up, and the system prompts emergency stop.

[0052] In the process, after the stop signal of each action process is released, the system can self-check whether the current action is in place, and continue according to the process based on the self-check status.

[0053] In the process, at the initial stage of execution, if due to external demand, the system can restore the valve state to the initial state through a reset operation.

[0054] In particular, the action of releasing the clamping electric head has a higher priority than that of the traveling electric head.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A large-caliber high-temperature blind plate valve, comprising a valve plate, a valve body and an electric actuator, characterized in that: The valve body includes a valve frame, a floating end flange assembly and a fixed end flange assembly respectively installed at both ends of the valve frame, a valve plate space is formed between the floating end flange assembly and the fixed end flange assembly for installing the valve plate, the valve plate includes a rectangular outer frame and a through-position ring and a blind-position plate arranged in the outer frame, a rotating disk assembly is externally sleeved on the floating end flange assembly, the electric actuator includes a loosening and clamping actuator and a walking actuator, the loosening and clamping actuator drives the rotating disk assembly to push the floating end flange assembly to extend and retract along the axial direction of the flow channel, thereby realizing the clamping and loosening of the valve plate, and the walking actuator is used to drive the valve plate to move in a direction perpendicular to the flow channel, thereby realizing the switching of the valve plate between the through position and the blind position.

2. A large-diameter high-temperature blind plate valve according to claim 1, characterized in that: The valve frame is an integrated assembled structure, including a front frame plate, a rear frame plate and side plates, the front frame plate and the rear frame plate are connected by a plurality of connecting shafts, the side plates are installed on both sides of the front frame plate and the rear frame plate, the floating end flange assembly is installed at one end of the valve frame close to the front frame plate, including a floating end connecting flange, a bellows and a pressure plate, the fixed end flange assembly is installed at one end of the valve frame close to the rear frame plate, including a fixed end connecting flange and a fixed valve seat, the fixed end flange assembly and the movable end flange assembly are in a flange-type bolted relationship with the valve frame, and the valve plate space for installing the valve plate is formed between the fixed valve seat and the pressure plate.

3. A large-diameter high-temperature blind plate valve according to claim 2, characterized in that: The rotating disk assembly includes a fixed disk, a rotating disk and a thrust disk which are sleeved on the outside of the pressure plate, wherein the inner hole of the fixed disk cooperates with the pressure plate and is provided with an anti-rotation key, one end of the fixed disk has an outer flange, the outer flange is fixedly connected to the front frame plate, the outer circle of the small end of the fixed disk is screwed together with the inner hole of the rotating disk by a thread, an inner flange is provided at the end of the rotating disk away from the fixed disk, a groove corresponding to the inner flange is provided on the pressure plate, a thrust disk is provided on the side adjacent to the inner flange of the rotating disk, and the thrust disk is fixedly connected to the pressure plate.

4. A large-diameter high-temperature blind plate valve according to claim 3, characterized in that: The thrust plate is composed of a petal ring and a locking ring. The inner side of the petal ring is embedded in the pressure plate, and the outer side of the petal ring is fixedly connected to the locking ring. The locking ring is sleeved on the outside of the pressure plate and is close to the inner flange of the rotating plate. An anti-rotation key is arranged between the locking plate and the pressure plate.

5. A large-diameter high-temperature blind plate valve according to claim 3, characterized in that: The loosening and clamping actuator includes an electric device, a screw and a slider arranged on a bracket, the slider is screwed together with the screw, sliding shafts are arranged on both sides of the slider and are guided by sliding grooves on the bracket, a swing arm is fixed on the outer peripheral surface of the rotating disk, a waist-shaped hole is arranged on the swing arm and is movably connected with the sliding shaft, the electric device outputs torque and transmits it through the screw, drives the slider to translate, and the slider drives the swing arm to swing, thereby converting the translational motion of the slider into the rotational motion of the rotating disk.

6. A large-diameter high-temperature blind plate valve according to claim 2, characterized in that: The travel actuator includes an electric device and a gear shaft. A groove is arranged on the top of the rectangular outer frame of the valve plate, and a rack is built in the groove. The travel actuator drives the gear shaft to rotate by outputting torque through the electric device, and then realizes the translational movement of the valve plate under the meshing action of the gear and the rack.

7. A large-diameter high-temperature blind plate valve according to claim 2, characterized in that: A compression spring and a shift fork are arranged on the connecting shaft near the center of the valve frame, and the compression spring and the shift fork are sleeved on the connecting shaft. The shift fork is a sleeve-shaped structure sleeved on the outside of the compression spring and provided with an inner retaining edge at one end. The compression spring is installed in a pre-compression state, and the fulcrum of one end of the compression spring is the rear valve frame, and the fulcrum of the other end is the inner retaining edge of the shift fork. A guide groove is arranged on the outer peripheral surface of the shift fork, and the rectangular outer frame of the valve plate is located in the guide groove. The compression spring and the shift fork are used to push the valve plate away after the pressure plate is loosened, so that the valve plate maintains a certain gap with the fixed valve seat.

8. A large-diameter high-temperature blind plate valve according to claim 2, characterized in that: A supporting roller or a straightening roller is provided on the connecting shaft near the edge of the valve frame. Both the supporting roller and the straightening roller have built-in bearings and are sleeved on the connecting shaft. Among them, the supporting roller is located below the valve plate, and is used to support the valve plate. The supporting roller rotates synchronously when the valve plate moves to reduce walking resistance; the straightening roller is located above the valve plate, and the straightening roller corresponds to the upper frame of the valve plate and is provided with an annular groove for avoiding the rack, which can avoid the valve plate from tilting when in the target position and ensure smoothness in the starting stage of the walking process.

9. A large-diameter high-temperature blind plate valve according to claim 2, characterized in that: The through position and blind position of the valve plate are respectively provided with sealing grooves on the annular surfaces corresponding to the pressure plate and the fixed valve seat, and a sealing member is provided in the sealing groove, and the sealing member is a rubber pad, a metal pad, or a metal+non-metal composite pad.

10. A large-diameter high-temperature blind plate valve according to any one of claims 1 to 9, characterized in that: An action interlock is set between the loosening and clamping actuator and the traveling actuator. When the loosening is not in place, the valve plate cannot perform the traveling action. When the valve plate is not switched into place, the loosening and clamping actuator cannot perform the clamping action.

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