A three-eccentric metal hard seal butterfly valve

Abstract

The present invention discloses a three-eccentric metal hard-sealed butterfly valve, which belongs to the technical field of butterfly valves, and solves the problem that the number of manually controlled three-eccentric metal hard-sealed butterfly valves is reduced in zinc smelting, while the number of electric control methods is increased. However, the electric control structure cannot withstand high temperatures and needs to be cooled to prevent heat from being transferred to the actuator, which leads to the problem that the zinc water may solidify when the valve plate is blocked, especially in the gap between the valve seat and the valve plate. Once solidified, the valve plate may not be able to open. It includes an inner valve body and an outer valve body fixedly connected to the outside of the inner valve body. The present invention can achieve opening and closing by isolating the drive component during normal opening and closing, avoiding heat transfer to the power source when opening and closing is not required, and when the zinc water is blocked during the zinc smelting and transportation process and there is a clear sealing requirement, the temperature of the valve plate can be changed by the thermostat component, so that the valve plate contacts the zinc water, the zinc water solidifies and closes the gap between the valve plate and the valve body, and when blocking is not required, the solidified zinc is reheated to return to the molten state.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valves, and in particular to a triple-eccentric metal hard-sealed butterfly valve. Background Art

[0002] The triple eccentric metal hard seal butterfly valve is a high-performance valve widely used in petroleum, chemical, electric power, metallurgy and other industrial fields. It adopts a unique triple eccentric design, which makes the valve plate completely separated from the valve seat when opened and achieves a tight seal when closed, effectively avoiding the friction and wear of the traditional butterfly valve during the opening and closing process. The sealing surface of this valve adopts metal hard seal, which has the advantages of high temperature resistance, corrosion resistance and wear resistance. It is suitable for a variety of harsh working conditions, including high temperature and high pressure, large flow, corrosive media and high viscosity media.

[0003] The structure of the three-eccentric metal hard seal butterfly valve includes key components such as the valve body, valve plate, and valve stem. The sealing surface of the valve plate can be welded with cobalt-based hard alloy to improve wear resistance and service life. The valve seat and valve plate are almost free of wear, and have a sealing function that becomes tighter as they are closed. It can also be designed to have a two-way sealing function and is not restricted by the flow direction of the medium during installation. In addition, the drive device of this butterfly valve can be installed in multiple positions, which is flexible to operate and convenient for users.

[0004] In terms of design, the valve seat sealing ring of the triple-eccentric metal hard-sealed butterfly valve is composed of multiple layers of stainless steel sheets on both sides of the hard T-shaped sealing ring. The sealing surface of the valve plate and the valve seat is an oblique cone structure. This structure effectively compensates for the tolerance zone between the sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, solving the sealing problem of the valve in the process of two-way interchangeable medium transportation.

[0005] The current three-eccentric metal hard-sealed butterfly valve mainly blocks the flow channel of the valve body by rotating the valve plate when blocking the fluid. In order to ensure its sealing effect, the fluid will act on the movable valve seat. When the fluid flows in the forward direction, the movable valve seat will be pushed by the fluid and then the movable valve seat will fit tightly with the fixed valve seat. When the fluid flows in the reverse direction, the movable valve seat will be pushed by the fluid, so that the movable valve seat can fit tightly with the outer ring of the valve plate, thereby completing the blocking of the fluid.

[0006] However, the above-mentioned conventional application methods are basically applicable to conventional fluids, which will not easily solidify during transportation. Instead, they are similar to applications in metallurgy. For example, in the process of zinc smelting, the molten zinc water maintains a temperature above 419.5 degrees Celsius. Once the zinc water comes into contact with an object with a lower temperature than that, it is possible to form solidified solid zinc on the surface of the object.

[0007] Normally, a manual three-eccentric metal hard-sealed butterfly valve is used as the structure for controlling the on-off of the zinc water pipeline during the zinc smelting process. The zinc water can transfer its own heat to the three-eccentric metal hard-sealed butterfly valve, so that the three-eccentric metal hard-sealed butterfly valve maintains a certain high temperature. When the three-eccentric metal hard-sealed butterfly valve is used to block the zinc water in a short time, the zinc water will not solidify.

[0008] However, with the development of the current automation process, the manual on-off control of zinc water by three-eccentric metal hard-sealed butterfly valves in the zinc smelting process has gradually become less and less, and the on-off control of the three-eccentric metal hard-sealed butterfly valve is realized more by electronic control. The electronic control structure of the three-eccentric metal hard-sealed butterfly valve cannot withstand the high temperature of up to 419.5℃. Therefore, certain measures are often taken to cool it down to avoid a large amount of heat being transferred to the electronic control actuator of the three-eccentric metal hard-sealed butterfly valve. However, in this way, when the zinc water encounters the blockage of the valve plate in the three-eccentric metal hard-sealed butterfly valve, the zinc water solidifies on the valve plate. This situation has a certain probability of occurring during the transportation of zinc water, especially the gap between the movable valve seat and the fixed valve seat, or the movable valve seat and the outer ring of the valve plate in the three-eccentric metal hard-sealed butterfly valve. Once the gap is filled with molten zinc water and cooled down, the valve plate will not be able to open again.

[0009] Therefore, a three-eccentric metal hard-sealed butterfly valve is proposed to solve or alleviate the above problems. Summary of the invention

[0010] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a three-eccentric metal hard-sealed butterfly valve.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] A three-eccentric metal hard-sealed butterfly valve, comprising an inner valve body, an outer valve body fixedly connected to the outside of the inner valve body, a valve plate rotatably arranged in the inner valve body and having a temperature control chamber, an upper rotating pipe and a lower rotating pipe respectively fixedly connected to both ends of the valve plate and connected to the temperature control chamber, an isolation drive assembly, and a temperature control assembly, wherein the upper rotating pipe and the lower rotating pipe both penetrate the inner valve body and the outer valve body and are rotatably arranged, the temperature control assembly is connected to the upper rotating pipe and the lower rotating pipe to form a loop, the temperature control assembly guides the temperature control medium into the temperature control chamber and controls the temperature of the temperature control medium, and also comprises a valve plate temperature control system, the valve plate temperature control system is respectively coupled to the isolation drive assembly and the temperature control assembly, the valve plate temperature control system detects the temperature condition of the outer ring of the valve plate to control the temperature change in the temperature control chamber and the operation of the isolation drive assembly, and the isolation drive assembly is used to be connected to the upper rotating pipe for transmission after being controlled.

[0013] Preferably, the inner ring of the inner valve body is integrally formed with a fixed valve seat, a heat-insulating cavity is formed between the inner valve body and the outer valve body, the outer ring of the inner valve body is integrally formed with a plurality of reinforcing ribs arranged at intervals, a connecting frame is fixedly connected to the outer valve body, and the upper rotating pipe passes through the connecting frame and is rotatably connected therein.

[0014] Preferably, the valve plate includes a hollow shaft connected to the upper transfer tube and the lower transfer tube, a connecting ring integrally formed with the outer ring of the hollow shaft, and a baffle fixedly connected to the connecting ring on the side away from the hollow shaft, a temperature regulating cavity is formed between the connecting ring and the baffle, and a connecting groove in the shape of a strip is provided on the peripheral wall of the hollow shaft, connecting the temperature regulating cavity with the interior of the hollow shaft.

[0015] Preferably, the isolation drive assembly includes a mounting seat, a traction electromagnet fixedly connected to the mounting seat, a fixed seat fixedly connected to the movable shaft of the traction electromagnet, and a servo motor fixedly connected to the fixed seat and vertically arranged, the traction electromagnet is electrically connected through a relay, the input ends of the relay and the servo motor are coupled to the valve plate temperature control system, an active friction wheel is coaxially fixedly connected to the output shaft of the servo motor, a groove is provided on the outer ring of the end of the upper rotating tube away from the valve plate, a driven friction wheel which can be transmission-connected to the active friction wheel is provided on the outer ring of the upper rotating tube, and an insert embedded in the groove is fixedly connected to the inner ring of the driven friction wheel, and the transmission ratio of the active friction wheel to the driven friction wheel is 1:N, N>1.

[0016] Preferably, the temperature control component includes a high-temperature medium feed pipeline, an air blowing pipeline and a pressure relief pipeline connected to the upper transfer pipe through an upper rotary joint, and a medium outlet pipeline connected to the lower transfer pipe through a lower rotary joint. The high-temperature medium feed pipeline is connected to the medium outlet pipeline, and the low-temperature medium in the medium outlet pipeline is guided into the high-temperature medium feed pipeline for heating and then discharged. The air blowing pipeline guides pressurized air into the medium in the temperature control chamber to adjust the uniformity and temperature of the medium. The pressure relief pipeline is used to discharge excess air in the temperature control chamber and adjust the air pressure therein. The high-temperature medium feed pipeline, the air blowing pipeline, and the medium outlet pipeline can be set to be on and off.

[0017] Preferably, the upper rotating joint is connected to an upper connecting pipe at one end away from the upper rotating pipe, the upper connecting pipe is connected to a first three-way joint, the first three-way joint is connected to a second three-way joint through the first connecting pipe, the first three-way joint is also connected to a pressure relief pipeline, the second three-way joint is connected to a high-temperature medium feeding pipeline and an air blowing pipeline, the pressure relief pipeline includes an air outlet pipe connected to the first three-way joint, and a high-temperature pressure relief valve connected to the air outlet pipe, the air blowing pipeline includes an air inlet pipe connected to the second three-way joint, a first solenoid valve connected to the air inlet pipe and coupled to a controller, a connecting air duct connected to the first solenoid valve, and a Roots blower connected to the connecting air duct, the Roots blower The blower is coupled to the controller through a motor drive chip, the high-temperature medium feeding pipeline includes a second connecting pipe connected to a second three-way joint, a second solenoid valve connected to the second connecting pipe and coupled to the controller, a third connecting pipe connected to the second solenoid valve, and a high-temperature tank connected to the third connecting pipe and storing high-temperature molten salt, the medium outflow pipeline includes a lower connecting pipe connected to a lower rotary joint, a third solenoid valve connected to the lower connecting pipe and coupled to the controller, and a low-temperature tank connected to the third solenoid valve through a fourth connecting pipe and used to store recovered medium, the low-temperature tank and the high-temperature tank are connected through a material guide pipe, and the material guide pipe is connected to a high-temperature circulation pump coupled to the controller.

[0018] Preferably, the valve plate temperature control system includes a thermal imager and a controller coupled to the thermal imager, wherein the thermal imager is used to obtain a thermal image of the valve plate, and the controller is used to control the temperature change in the temperature control chamber according to the temperature of the outer ring of the valve plate, and the controller is coupled to the temperature control component and the isolation drive component.

[0019] Preferably, the controller is used to control the temperature change in the temperature regulating chamber according to the temperature of the outer ring of the valve plate, comprising the following steps:

[0020] Step 1: Data acquisition: using thermal imaging technology to obtain a thermal image of the valve plate, and selecting the projection surface data of the temperature control cavity according to the size of the temperature control cavity to obtain a thermal image of the outer ring of the valve plate;

[0021] Step 2: image preprocessing, converting the thermal image of the outer ring of the valve plate into a grayscale image;

[0022] Step 3, convert the grayscale image into a temperature data matrix, where the grayscale value of each pixel corresponds to a temperature data;

[0023] Step 4: Calculate the average temperature of the outer ring of the valve plate using formula 1 , calculate the temperature standard deviation of the outer ring of the valve plate by formula 2 ;

[0024] Step 5: For each point on the outer ring of the valve plate, calculate the deviation between its temperature and the average temperature using Formula 3. ;

[0025] Step 6: Set the temperature uniformity threshold deviation , and the deviation and temperature uniformity threshold Compare, if all the deviations Less than , the temperature distribution of the outer ring of the valve plate is uniform, otherwise it is considered uneven and the Roots blower is controlled by the controller for intermittent aeration.

[0026] Preferably, the formula 1 is , the formula 2 is , the formula three is ,in, is the temperature data of the i-th point on the outer ring of the valve plate, and N is the number of temperature data points on the outer ring of the valve plate.

[0027] Preferably, the controller is used to control the temperature change in the temperature regulating chamber according to the temperature of the outer ring of the valve plate, comprising the following steps:

[0028] The step 4.5 is also included, setting the melting temperature threshold and the solidification temperature threshold, and setting the average temperature of the outer ring of the valve plate Contrast with melting temperature threshold or solidification temperature threshold;

[0029] Step 4.6: When the controller receives the butterfly valve opening command, the average temperature of the outer ring of the valve plate Compared with the melting temperature threshold, if the average temperature of the outer ring of the valve plate > melting temperature threshold, the controller cuts off the power to the traction electromagnet and controls the servo motor to work. Conversely, the controller controls the high-temperature circulation pump to guide the molten salt in the temperature adjustment chamber to renew and repeat steps 4 and 4.6;

[0030] Step 4.7, when the controller receives the butterfly valve closing command, the controller controls the traction electromagnet to cut off the power and the servo motor to work, and the average temperature of the outer ring of the valve plate Compared with the freezing temperature threshold, if the average temperature of the outer ring of the valve plate > solidification temperature threshold, the controller controls the Roots blower to work continuously, otherwise it stops.

[0031] The present invention has the following beneficial effects:

[0032] The present invention enables the three-eccentric metal hard-sealed butterfly valve to be opened or closed only when needed, thereby preventing unnecessary heat from being transferred to the power source;

[0033] During the zinc smelting process, when it is necessary to block the molten zinc and ensure sealing, this technology can use the thermostatic component to adjust the temperature of the valve plate, so that the valve plate contacts the molten zinc and promotes the solidification of the molten zinc to close the gap between the valve plate and the valve body. When blocking is not required, the solidified zinc is restored to a liquid state by reheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 is a cross-sectional view of the present invention;

[0037] Figure 3 It is a structural diagram of the present invention.

[0038] 1. Inner valve body; 2. Outer valve body; 3. Fixed valve seat; 4. Reinforced ribs; 5. Insulation cavity; 6. Hollow shaft; 7. Connecting ring; 8. Baffle; 9. Connecting groove; 10. Upper rotating tube; 11. Lower rotating tube; 12. Connecting frame; 13. Slide; 14. Driven friction wheel; 15. Mounting seat; 16. Traction electromagnet; 17. Fixed seat; 18. Servo motor; 19. Active friction wheel; 20. Temperature adjustment cavity; 21. Upper rotating joint; 22. Lower rotating joint; 23. Upper connecting pipe; 24, first three-way joint; 25, first connecting pipe; 26, second three-way joint; 27, air inlet pipe; 28, first solenoid valve; 29, connecting air duct; 30, Roots blower; 31, air outlet pipe; 32, high-temperature pressure relief valve; 33, second connecting pipe; 34, second solenoid valve; 35, third connecting pipe; 36, high-temperature tank; 37, lower connecting pipe; 38, third solenoid valve; 39, fourth connecting pipe; 40, low-temperature tank; 41, material guide pipe; 42, high-temperature circulation pump. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the invention is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] A three-eccentric metal hard seal butterfly valve, such as Figure 1 and Figure 2As shown, it includes an inner valve body 1, an outer valve body 2 fixedly connected to the outer side of the inner valve body 1, a valve plate rotatably arranged in the inner valve body 1 and having a temperature control chamber 20, an upper rotating pipe 10 and a lower rotating pipe 11 respectively fixedly connected to both ends of the valve plate and connected to the temperature control chamber 20, an isolation drive component, and a temperature control component. The upper rotating pipe 10 and the lower rotating pipe 11 both penetrate the inner valve body 1 and the outer valve body 2 and are rotatably arranged. The temperature control component is connected to the upper rotating pipe 10 and the lower rotating pipe 11 and forms a loop. The temperature control component guides the temperature control medium into the temperature control chamber 20 and controls the temperature of the temperature control medium. It also includes a valve plate temperature control system. The valve plate temperature control system is coupled to the isolation drive component and the temperature control component respectively. The valve plate temperature control system detects the temperature of the outer ring of the valve plate to control the temperature change in the temperature control chamber 20 and the operation of the isolation drive component. The isolation drive component is used to be connected to the upper rotating pipe 10 in transmission after being controlled.

[0046] The butterfly valve including the inner valve body 1 and the outer valve body 2 can form a jacket valve body structure, so that the butterfly valve itself has a certain heat insulation effect. Since there is a temperature adjustment cavity 20 in the valve plate, the temperature of the valve plate itself can be adjusted according to the temperature adjustment component. The arrangement of the upper rotating pipe 10 and the lower rotating pipe 11 ensures that the valve plate can rotate smoothly and is connected with the temperature adjustment component. Under normal circumstances, the opening and closing action of the butterfly valve is directly controlled by the valve plate temperature control system to directly control the isolation drive component, so that the isolation drive The component is controlled to switch from a state of being separated from the upper transfer tube 10 to a state of being transmission-connected with the upper transfer tube 10, and then after the rotation adjustment of the upper transfer tube 10 is completed, the isolation drive component can be separated from the upper transfer tube 10 again, thereby preventing the high-temperature heat of the zinc water from being transmitted all the way upward through the valve plate, and preventing the power source from being affected by the high temperature and unable to work. In the zinc smelting process, the transportation of molten zinc water is not always required. In this case, the valve plate is required to block the flow channel in the inner valve body 1. At this time, in order to prevent the zinc water from flowing between the valve plate and the valve seat, In the event of leakage between the valve plate and the valve seat, or between the valve plate and the valve body, the temperature of the medium can be input into the temperature regulating chamber 20 of the valve plate through the temperature regulating component, and the temperature of the medium can be controlled to drop, thereby reducing the temperature of the valve plate. In this way, the zinc water in contact with the valve plate can be cooled to below its solidification point, so that the zinc water forms solid zinc, and the solid zinc can seal the valve plate and the valve seat, or between the valve plate and the valve body. In this way, even if there is high pressure on one side of the pipeline, it is difficult for leakage to occur between the valve plate and the valve seat, or between the valve plate and the valve body. However, if the valve plate needs to be rotated to open the flow channel in the valve body later, the medium in the temperature regulating chamber 20 in the valve plate is still replaced and heated by the temperature regulating component, so that the temperature of the valve plate rises to the melting point of zinc, so that the solidified zinc returns to a molten state, and the solidified zinc is prevented from hindering the normal rotation of the valve plate. In this way, the solidification phenomenon of molten zinc in the process of valve plate blocking is fully utilized, so that the valve plate has extremely strong sealing when blocking the molten zinc.

[0047] Preferably, if Figure 2 As shown, the inner ring of the inner valve body 1 is integrally formed with a fixed valve seat 3, a heat-insulating cavity 5 is formed between the inner valve body 1 and the outer valve body 2, the outer ring of the inner valve body 1 is integrally formed with a plurality of reinforcing ribs 4 arranged at intervals, a connecting frame 12 is fixedly connected to the outer valve body 2, and the upper rotating pipe 10 passes through the connecting frame 12 and is rotatably connected therein.

[0048] The reinforcing ribs 4 make the inner valve body 1 itself have better structural strength. In the process of transporting molten metal at high temperature and high pressure, it will not be deformed or damaged due to the high pressure. The setting of the outer valve body 2 enables it to form a heat-insulating cavity 5 with the inner valve body 1. The heat-insulating cavity 5 can prevent the high temperature of the molten zinc from being excessively transferred to the outside, thereby achieving a certain degree of heat-insulating effect.

[0049] Preferably, if Figure 2 As shown, the valve plate includes a hollow shaft 6 connected to an upper rotating tube 10 and a lower rotating tube 11, a connecting ring 7 integrally formed with the outer ring of the hollow shaft 6, and a baffle 8 fixedly connected to the connecting ring 7 on a side away from the hollow shaft 6, a temperature regulating chamber 20 is formed between the connecting ring 7 and the baffle 8, and a connecting groove 9 in the shape of a strip is provided on the peripheral wall of the hollow shaft 6 to connect the temperature regulating chamber 20 with the interior of the hollow shaft 6.

[0050] The arrangement of the connecting ring 7 and the baffle 8 enables the structure of the temperature regulating chamber 20 to be formed in the valve plate, and enables the connecting ring 7 and the outer ring of the baffle 8 covered by the projection surface of the connecting ring 7 to serve as the outer ring of the valve plate to mainly exchange heat with the medium in the temperature regulating chamber 20, thereby adjusting the temperature when in contact with the zinc water.

[0051] Preferably, if Figure 1 and Figure 2 As shown, the isolation drive assembly includes a mounting seat 15, a traction electromagnet 16 fixedly connected to the mounting seat 15, a fixing seat 17 fixedly connected to the movable shaft of the traction electromagnet 16, and a servo motor 18 fixedly connected to the fixing seat 17 and vertically arranged. The traction electromagnet 16 is electrically connected through a relay, and the input ends of the relay and the servo motor 18 are coupled to the valve plate temperature control system. An active friction wheel 19 is coaxially fixedly connected to the output shaft of the servo motor 18. A slide groove 13 is provided on the outer ring of the end of the upper rotating tube 10 away from the valve plate. The outer ring of the upper rotating tube 10 is provided with a driven friction wheel 14 that can be transmission-connected to the active friction wheel 19, and the inner ring of the driven friction wheel 14 is fixedly connected with an insert embedded in the slide groove 13. The transmission ratio of the active friction wheel 19 to the driven friction wheel 14 is 1:N, and N>1.

[0052] When the isolation drive component needs to adjust the rotation of the upper rotating tube 10, the traction electromagnet 16 is powered off through the relay control, so that the movable shaft of the traction electromagnet 16 can be extended, and then the traction electromagnet 16 drives the servo motor 18 to move toward the direction of the upper rotating tube 10 through the fixed shaft. At this time, the active friction wheel 19 on the output shaft of the servo motor 18 can fit tightly with the driven friction wheel 14 on the outer ring of the upper rotating tube 10, so that the transmission action is achieved through friction between the two. When the driven friction wheel 14 needs to be installed, the driven friction wheel 14 can be directly slid downward from the upper end of the upper rotating tube 10. It only needs to ensure that the insert can be smoothly embedded in the slide groove 13 on the outer ring of the upper rotating tube 10 to achieve the driven friction. The friction wheel 14 is fixedly connected to the upper rotating tube 10. Since the transmission ratio of the active friction wheel 19 to the driven friction wheel 14 is 1:N, N>1, when the active friction wheel 19 drives the driven friction wheel 14, the rotation angle of the active friction wheel 19 is large, while the rotation angle of the driven friction wheel 14 is small, so that the rotation angle of the controlled upper rotating tube 10 and the valve plate is more accurate. After adjusting the rotation, the servo motor 18 stops working, and the relay controls the traction electromagnet 16 to be energized again. At this time, the traction electromagnet 16 will move the servo motor 18 and the active friction wheel 19, so that the active friction wheel 19 is separated from the driven friction wheel 14, so that the heat on the valve body cannot be transferred to the servo motor 18, thereby avoiding damage to the servo motor 18.

[0053] Preferably, if Figure 3 As shown, the temperature control component includes a high-temperature medium feed pipeline, an air blowing pipeline and a pressure relief pipeline connected to the upper rotating pipe 10 through an upper rotating joint 21, and a medium outlet pipeline connected to the lower rotating pipe 11 through a lower rotating joint 22. The high-temperature medium feed pipeline is connected to the medium outlet pipeline, and the low-temperature medium in the medium outlet pipeline is guided into the high-temperature medium feed pipeline for heating and then discharged. The air blowing pipeline guides pressurized air into the medium located in the temperature control chamber 20 to adjust the uniformity of the medium and the temperature of the medium. The pressure relief pipeline is used to discharge excess air in the temperature control chamber 20 and adjust the air pressure therein. The high-temperature medium feed pipeline, the air blowing pipeline, and the medium outlet pipeline can be set to be on and off;

[0054] The upper rotary joint 21 is connected to an upper connecting pipe 23 at one end away from the upper rotating pipe 10, and the upper connecting pipe 23 is connected to a first three-way joint 24, and the first three-way joint 24 is connected to a second three-way joint 26 through a first connecting pipe 25. The first three-way joint 24 is also connected to a pressure relief pipeline, and the second three-way joint 26 is connected to a high-temperature medium feeding pipeline and an air blowing pipeline. The pressure relief pipeline includes an air outlet pipe 31 connected to the first three-way joint 24, and a high-temperature pressure relief valve 32 connected to the air outlet pipe 31. The air blowing pipeline includes an air inlet pipe 27 connected to the second three-way joint 26, a first solenoid valve 28 connected to the air inlet pipe 27 and coupled to a controller, a connecting air duct 29 connected to the first solenoid valve 28, and a Roots blower 30 connected to the connecting air duct 29. The Roots blower 30 Coupling with the controller through the motor driving chip, the high-temperature medium feeding pipeline includes a second connecting pipe 33 connected to the second three-way joint 26, a second solenoid valve 34 connected to the second connecting pipe 33 and coupled to the controller, a third connecting pipe 35 connected to the second solenoid valve 34, and a high-temperature tank 36 connected to the third connecting pipe 35 and storing high-temperature molten salt. The medium outflow pipeline includes a lower connecting pipe 37 connected to the lower rotary joint 22, a third solenoid valve 38 connected to the lower connecting pipe 37 and coupled to the controller, and a low-temperature tank 40 connected to the third solenoid valve 38 through a fourth connecting pipe 39 and used to store recovered medium. The low-temperature tank 40 and the high-temperature tank 36 are connected by a guide pipe 41, and the guide pipe 41 is connected to a high-temperature circulation pump 42 coupled to the controller.

[0055] When the temperature control component needs to be heated, the high-temperature medium is introduced into the temperature control chamber 20 through the high-temperature medium feed pipeline. When the temperature of the medium in the temperature control chamber 20 is uneven, the air blowing pipeline can perform a similar aeration action on the medium in the temperature control chamber 20, so that the medium is mixed evenly and the temperature of the medium is kept uniform everywhere. If the temperature of the medium in the temperature control chamber 20 needs to be lowered, the medium in the temperature control chamber 20 can be continuously pumped through the air blowing pipeline, that is, a similar aeration action is performed to allow outside air to enter the medium (molten salt), so that the temperature of the medium drops rapidly, and excess air and higher air pressure can be discharged through the pressure relief pipeline to avoid the problem of excessive air pressure. When the temperature of the medium is too low, the low-temperature medium in the temperature control chamber 20 can be guided into the high-temperature medium feed pipeline through the medium outlet pipeline for heating and then discharged again.

[0056] Preferably, the valve plate temperature control system includes a thermal imager and a controller coupled to the thermal imager. The thermal imager is used to obtain a thermal image of the valve plate. The controller is used to control the temperature change in the temperature control chamber 20 according to the temperature of the outer ring of the valve plate. The controller is coupled to the temperature control component and the isolation drive component.

[0057] By setting up a thermal imager, it is possible to obtain a thermal image of the valve plate, thereby determining the temperature of the outer ring of the valve plate, and then facilitating the controller to control the temperature control component and the isolation drive component, thereby adjusting the temperature in the temperature control chamber 20.

[0058] Preferably, the controller is used to control the temperature change in the temperature regulating chamber 20 according to the temperature of the outer ring of the valve plate, including the following steps:

[0059] Step 1, data acquisition, using thermal imaging technology to obtain a thermal image of the valve plate, and screening the projection surface data of the temperature regulating cavity 20 according to the size of the temperature regulating cavity 20 to obtain a thermal image of the outer ring of the valve plate;

[0060] Step 2: image preprocessing, converting the thermal image of the outer ring of the valve plate into a grayscale image;

[0061] Step 3, convert the grayscale image into a temperature data matrix, where the grayscale value of each pixel corresponds to a temperature data;

[0062] Step 4: Calculate the average temperature of the outer ring of the valve plate using formula 1 , calculate the temperature standard deviation of the outer ring of the valve plate by formula 2 ;

[0063] Step 5: For each point on the outer ring of the valve plate, calculate the deviation between its temperature and the average temperature using Formula 3. ;

[0064] Step 6: Set the temperature uniformity threshold deviation , and the deviation and temperature uniformity threshold Compare, if all the deviations Less than , the temperature distribution of the outer ring of the valve plate is uniform, otherwise it is considered uneven and the controller is used to control the Roots blower for intermittent aeration;

[0065] Formula 1 is , formula 2 is , formula three is ,in, is the temperature data of the i-th point on the outer ring of the valve plate, and N is the number of temperature data points on the outer ring of the valve plate.

[0066] The thermal image acquired by the thermal imager is processed according to the above steps to determine whether the temperature of the outer ring of the valve plate is uniform. Since the temperature of the outer ring of the valve plate is obtained by heat exchange with the medium in the temperature control chamber 20, the temperature uniformity of the medium in the temperature control chamber 20 can also be determined by the temperature uniformity of the outer ring of the valve plate. This can also reduce the amount of data processing and speed up the derivation of the final result.

[0067] Preferably, the controller is used to control the temperature change in the temperature regulating chamber according to the temperature of the outer ring of the valve plate, including the following steps:

[0068] The step 4.5 is also included, setting the melting temperature threshold and the solidification temperature threshold, and setting the average temperature of the outer ring of the valve plate Contrast with melting temperature threshold or solidification temperature threshold;

[0069] Step 4.6: When the controller receives the butterfly valve opening command, the average temperature of the outer ring of the valve plate Compared with the melting temperature threshold, if the average temperature of the outer ring of the valve plate > melting temperature threshold, the controller cuts off the power to the traction electromagnet 16 and controls the servo motor 18 to work. Conversely, the controller controls the high-temperature circulation pump 42 to guide the molten salt in the temperature adjustment chamber 20 to be renewed and then repeat steps 4 and 4.6;

[0070] Step 4.7, when the controller receives the butterfly valve closing instruction, the controller controls the traction electromagnet 16 to cut off the power and the servo motor 18 to work, and the average temperature of the outer ring of the valve plate Compared with the freezing temperature threshold, if the average temperature of the outer ring of the valve plate > the solidification temperature threshold, the controller controls the Roots blower 30 to continue working, otherwise it stops.

[0071] In the process of understanding the temperature uniformity of the outer ring of the valve plate, the average temperature of the outer ring of the valve plate will inevitably be obtained. Through the above method, not only can it be smoothly judged whether the temperature distribution of the medium in the temperature control chamber 20 is uniform, but it can also be judged whether the medium temperature in the temperature control chamber 20 meets the current requirements for the medium temperature, that is, when the controller receives the butterfly valve opening or closing instruction, the temperature requirement of the valve plate. In this way, the controller can also have a clearer and more accurate standard for the control of the temperature control component, which is convenient for the control of the controller.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-eccentric metal hard-sealed butterfly valve, characterized in that: The invention comprises an inner valve body (1), an outer valve body (2) fixedly connected to the outer side of the inner valve body (1), a valve plate rotatably arranged in the inner valve body (1) and having a temperature adjustment chamber (20), an upper rotating pipe (10) and a lower rotating pipe (11) respectively fixedly connected to both ends of the valve plate and connected to the temperature adjustment chamber (20), an isolation drive component, and a temperature adjustment component, wherein the upper rotating pipe (10) and the lower rotating pipe (11) both penetrate the inner valve body (1) and the outer valve body (2) and are rotatably arranged, the temperature adjustment component is connected to the upper rotating pipe (10) and the lower rotating pipe (11) to form a loop, and the temperature adjustment component guides the temperature adjustment medium into the temperature adjustment chamber (20) and controls the temperature adjustment. The temperature of the medium also includes a valve plate temperature control system, the valve plate temperature control system is coupled to the isolation drive component and the temperature adjustment component respectively, the valve plate temperature control system detects the temperature of the valve plate outer ring to control the temperature change in the temperature adjustment chamber (20) and the operation of the isolation drive component, the isolation drive component is used to be connected to the upper transfer pipe (10) after being controlled, the valve plate temperature control system includes a thermal imager and a controller coupled to the thermal imager, the thermal imager is used to obtain a thermal image of the valve plate, the controller is used to control the temperature change in the temperature adjustment chamber (20) according to the temperature of the valve plate outer ring, and the controller is coupled to the temperature adjustment component and the isolation drive component; The controller is used to control the temperature change in the temperature adjustment chamber (20) according to the temperature of the outer ring of the valve plate, and comprises the following steps: Step 1, data acquisition, using thermal imaging technology to obtain a thermal image of the valve plate, and selecting the projection surface data of the temperature regulating cavity (20) according to the size of the temperature regulating cavity (20), to obtain a thermal image of the outer ring of the valve plate; Step 2: image preprocessing, converting the thermal image of the outer ring of the valve plate into a grayscale image; Step 3, convert the grayscale image into a temperature data matrix, where the grayscale value of each pixel corresponds to a temperature data; Step 4: Calculate the average temperature of the outer ring of the valve plate using formula 1 , the formula 1 is , calculate the temperature standard deviation of the outer ring of the valve plate by formula 2 , the formula 2 is ; Step 4.5, set the melting temperature threshold and solidification temperature threshold, and the average temperature of the outer ring of the valve plate Contrast with melting temperature threshold or solidification temperature threshold; Step 4.6: When the controller receives the butterfly valve opening command, the average temperature of the outer ring of the valve plate Compared with the melting temperature threshold, if the average temperature of the outer ring of the valve plate > melting temperature threshold, the controller cuts off the power to the traction electromagnet (16) and controls the servo motor (18) to work; conversely, the controller controls the high-temperature circulation pump (16) to guide the molten salt in the temperature adjustment chamber (20) to be renewed and then repeats steps 4 and 4.6; Step 4.7, when the controller receives the butterfly valve closing command, the controller controls the traction electromagnet (16) to cut off the power and the servo motor (18) to start, and the average temperature of the outer ring of the valve plate is set to Compared with the freezing temperature threshold, if the average temperature of the outer ring of the valve plate > the solidification temperature threshold, the controller controls the Roots blower (30) to continue working, otherwise it stops. Step 5: For each point on the outer ring of the valve plate, calculate the deviation between its temperature and the average temperature using Formula 3. , the formula three is ,in, is the temperature data of the i-th point on the outer ring of the valve plate, and N is the number of temperature data points on the outer ring of the valve plate; Step 6: Set the temperature uniformity threshold deviation , and the deviation and temperature uniformity threshold Compare, if all the deviations Less than , the temperature distribution of the outer ring of the valve plate is uniform, otherwise it is considered uneven and the Roots blower is controlled by the controller for intermittent aeration.

2. A triple eccentric metal hard seal butterfly valve according to claim 1, characterized in that: The inner ring of the inner valve body (1) is integrally formed with a fixed valve seat (3), a heat-insulating cavity (5) is formed between the inner valve body (1) and the outer valve body (2), the outer ring of the inner valve body (1) is integrally formed with a plurality of reinforcing ribs (4) arranged at intervals, a connecting frame (12) is fixedly connected to the outer valve body (2), and the upper rotating pipe (10) passes through the connecting frame (12) and is rotatably connected thereto.

3. A triple eccentric metal hard seal butterfly valve according to claim 1, characterized in that: The valve plate comprises a hollow shaft (6) connected to an upper rotating tube (10) and a lower rotating tube (11), a connecting ring (7) integrally formed with the outer ring of the hollow shaft (6), and a baffle (8) fixedly connected to the connecting ring (7) on a side away from the hollow shaft (6), a temperature regulating chamber (20) is formed between the connecting ring (7) and the baffle (8), and a strip-shaped connecting groove (9) is provided on the peripheral wall of the hollow shaft (6) and connects the temperature regulating chamber (20) with the interior of the hollow shaft (6).

4. A triple eccentric metal hard seal butterfly valve according to claim 1, characterized in that: The isolation drive assembly comprises a mounting seat (15), a traction electromagnet (16) fixedly connected to the mounting seat (15), a fixing seat (17) fixedly connected to a movable shaft of the traction electromagnet (16), and a servo motor (18) fixedly connected to the fixing seat (17) and arranged vertically, wherein the traction electromagnet (16) is electrically connected via a relay, the input ends of the relay and the servo motor (18) are coupled to a valve plate temperature control system, an active friction wheel (19) is coaxially fixedly connected to an output shaft of the servo motor (18), a sliding groove (13) is provided on the outer ring of an end of the upper rotating tube (10) away from the valve plate, a driven friction wheel (14) which can be transmission-connected to the active friction wheel (19) is sleeved on the outer ring of the upper rotating tube (10), and an insert embedded in the sliding groove (13) is fixedly connected to the inner ring of the driven friction wheel (14), and a transmission ratio between the active friction wheel (19) and the driven friction wheel (14) is 1:N, where N>1.

5. A triple eccentric metal hard seal butterfly valve according to claim 4, characterized in that: The temperature control component comprises a high-temperature medium feed pipeline, an air blowing pipeline and a pressure relief pipeline connected to the upper rotating pipe (10) through an upper rotating joint (21), and a medium outlet pipeline connected to the lower rotating pipe (11) through a lower rotating joint (22). The high-temperature medium feed pipeline is connected to the medium outlet pipeline, and the low-temperature medium in the medium outlet pipeline is guided into the high-temperature medium feed pipeline for heating and then discharged. The air blowing pipeline guides pressurized air into the medium in the temperature control chamber (20) to adjust the uniformity and temperature of the medium. The pressure relief pipeline is used to discharge excess air in the temperature control chamber (20) and adjust the air pressure therein. The high-temperature medium feed pipeline, the air blowing pipeline, and the medium outlet pipeline can be set to be on and off.

6. A triple eccentric metal hard seal butterfly valve according to claim 5, characterized in that: An end of the upper rotary joint (21) away from the upper rotary pipe (10) is connected to an upper connecting pipe (23), the upper connecting pipe (23) is connected to a first three-way joint (24), the first three-way joint (24) is connected to a second three-way joint (26) via a first connecting pipe (25), the first three-way joint (24) is also connected to a pressure relief pipeline, the second three-way joint (26) is connected to a high-temperature medium feed pipeline and an air blowing pipeline, the pressure relief pipeline comprises an air outlet pipe (31) connected to the first three-way joint (24), and a high-temperature pressure relief valve (32) connected to the air outlet pipe (31), the air blowing pipeline comprises an air inlet pipe (27) connected to the second three-way joint (26), a first solenoid valve (28) connected to the air inlet pipe (27) and coupled to a controller, a connecting air pipe (29) connected to the first solenoid valve (28), and a Roots blower (30) connected to the connecting air pipe (29), the Roots blower (30) The blower (30) is coupled to the controller via a motor drive chip; the high-temperature medium feed pipeline comprises a second connecting pipe (33) connected to the second three-way joint (26); a second solenoid valve (34) connected to the second connecting pipe (33) and coupled to the controller; a third connecting pipe (35) connected to the second solenoid valve (34); and a high-temperature tank (36) connected to the third connecting pipe (35) and storing high-temperature molten salt; the medium outflow pipeline comprises a lower connecting pipe (37) connected to the lower rotary joint (22); a third solenoid valve (38) connected to the lower connecting pipe (37) and coupled to the controller; and a low-temperature tank (40) connected to the third solenoid valve (38) via a fourth connecting pipe (39) and used to store recovered medium; the low-temperature tank (40) and the high-temperature tank (36) are connected via a guide pipe (41); and a high-temperature circulation pump (42) coupled to the controller is connected to the guide pipe (41).

Images