A full-bore high-temperature and high-pressure butterfly valve

Abstract

The present invention discloses a full-bore high-temperature and high-pressure butterfly valve, which belongs to the field of valve technology, solves two dead loops, and makes the current butterfly valve design not consider such flow factors, but only consider strength. This leads to the flow rate of many pipeline design sizes after the butterfly valve is installed is only 20-70% of the designed pipeline, which brings production troubles and even safety hazards to the system. It includes a valve body, which includes two inlets and an inner cavity connected to the two inlets. The inlet is used to connect with the pipeline and its diameter is the same as the pipeline diameter. The diameter of the inner cavity is larger than the pipeline diameter by 1-2 specifications. The valve body located at the inlet and the valve body located at the inner cavity is set to a 15° flare for smooth transition. The present invention designs a 15° flare for smooth transition inside the valve body, and adopts a smooth transition design while increasing the inner cavity, which effectively reduces the fluid resistance generated by the fluid medium when passing through the inside of the butterfly valve, reduces the pressure drop loss, saves pipeline kinetic energy, and improves the comprehensive performance of the product.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a full-diameter, high-temperature and high-pressure butterfly valve. Background Art

[0002] Due to the structural characteristics of butterfly valve products, the opening and closing parts such as the disc plate, valve shaft, and valve seat occupy more space inside the valve body. Therefore, butterfly valve products cannot achieve the full flow of the pipeline design and can only be manufactured according to the reduced diameter (smaller than the pipeline design) (for example, the pipeline design is 500mm, and the butterfly valve uses a DN500 diameter, but its actual effective flow area is only about 400-450mm). Therefore, relevant butterfly valve standards at home and abroad have a minimum valve seat diameter (generally not less than about 90% of the inner diameter of the pipeline), that is, the minimum valve seat diameter of a butterfly valve designed for a pipeline inner diameter of 500mm is generally 475mm (95% of the inner diameter of the pipeline) and can be as small as 450mm (90% of the inner diameter of the pipeline). In addition, the valve shaft runs through the valve body, and there is a disc plate on the valve shaft. The entire cross-section occupies a large area inside the pipeline, so butterfly valve products cannot achieve the full flow of the pipeline.

[0003] Due to the requirements of the process system and cost savings, the design of the pipeline is basically to just meet the system operation requirements. At this time, if a butterfly valve is used, it is equivalent to making a pipeline diameter change in disguise, and the original large pipeline is forced to be changed to 1~2 specifications smaller through the butterfly valve. This brings troubles to the system design and operation. If a pipeline with 1~2 specifications larger is designed (for example, the 500mm pipeline above needs to use a flow rate that can reach the full-diameter requirement of the 500mm pipeline, the pipeline can only be designed to be one or two specifications larger and use a 600mm pipeline. At the same time, the butterfly valve uses DN600 to achieve a pipeline flow of about 500mm), due to the long pipeline, a pipeline with 1~2 specifications larger will bring a lot of capital waste to the investment, so only ball valves and other valves that can achieve full-diameter flow can be used. However, after the pipeline is larger than 600mm, the manufacturing cost of the ball valve is too high and the manufacturing difficulty is large.

[0004] In order to maximize the flow rate, the current butterfly valve can only design the valve stem to be the smallest, the disc plate to be the thinnest, and the valve seat to be the largest. However, due to its internal structure, these structural components must exist. The maximum small and thin design can only alleviate this difficulty to a certain extent. At the same time, due to the weakening of the internal structural components, the strength of the internal structural components is reduced, so that the product's operating pressure is not high, causing safety hazards.

[0005] In addition, since the sizes of pipelines internationally are based on the outer diameter, the higher the pressure, the thicker the pipe wall. Under the premise that the outer diameter of the pipeline remains unchanged, the thicker the wall thickness, the smaller the inner diameter will only become.

[0006] Since the internal structural components of the butterfly valve, such as the valve shaft, disc plate, valve seat, and sealing ring, are pressure-bearing components, the higher the pressure, the greater the strength required. For metal materials, under the premise that the material remains unchanged, the only way to increase the strength is to increase the size of the material. The larger the valve shaft size, the greater the strength; the thicker the disc plate, the greater the strength; the thicker the axial and radial dimensions of the valve seat and sealing ring, the greater the strength.

[0007] There is an inevitable physical conflict here. The higher the pressure level of the pipeline, the smaller the inner diameter. The higher the pressure level of the valve, the larger and thicker the internal structural components are, and the larger the internal space they occupy. The inner diameter of the pipeline shrinks as the pressure level increases (for example, the outer diameter of a pipeline with a nominal diameter of 500mm is 508mm, the wall thickness is 32 at PN420, and the inner diameter is only 508-32X2=444mm). The higher the pressure level of the valve, the higher the strength requirement of the internal structural components, the larger the size, and the larger the space it occupies (for example, the total area of ​​the internal structural components of a DN500 butterfly valve at PN420 accounts for about 32% of the pipeline, that is, the original inner diameter of only 444 minus about 140mm, and the actual effective flow area is less than 304mm in diameter). Such physical conflict is inevitable.

[0008] The physical conflict is reflected in two aspects. One is that the inner diameter of the pipeline decreases with the increase of pressure level, while the internal structure of the butterfly valve increases with the increase of pressure level.

[0009] Therefore, another physical conflict is reflected in the internal structural components of the butterfly valve, that is, the structural performance of the internal structural components is required to be stronger, and the volume of the internal structural components is required to be smaller.

[0010] There are two dead loops that cannot be solved, so the current butterfly valve design does not consider such flow factors, but only considers strength. This leads to the flow rate of many pipelines with designed sizes being only 20% to 70% of the designed pipeline after the butterfly valve is installed, causing production problems and even safety hazards to the system.

[0011] Therefore, a full-bore high-temperature and high-pressure butterfly valve is proposed to solve or alleviate the above problems. Summary of the invention

[0012] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a full-diameter, high-temperature and high-pressure butterfly valve.

[0013] In order to achieve the above object, the present invention adopts the following technical solutions:

[0014] A full-bore, high-temperature, and high-pressure butterfly valve comprises a valve body, wherein the valve body comprises two inlets and an inner cavity connected to the two inlets, wherein the inlet is used to connect to a pipeline and its diameter is the same as the diameter of the pipeline, and the diameter of the inner cavity is 1-2 specifications larger than the diameter of the pipeline, and the valve bodies located at the inlet and the inner cavity are set to have a 15° bell mouth for smooth transition.

[0015] Preferably, the top surface of the valve body is provided with an opening communicating with the inner cavity, and a valve cover capable of closing the opening is connected to the valve body by bolts, the valve cover is in an inverted T-shape, a valve shaft extending into the valve body is rotatably connected to the valve cover, the lower end of the valve shaft is fixedly connected to a plane bearing in the valve body, a butterfly plate is detachably connected to the valve shaft, the valve body located in the inner cavity is detachably connected to a metal valve seat via a valve seat fixing ring, and a metal sealing ring capable of contacting the metal valve seat is fixedly connected to the butterfly plate.

[0016] Preferably, the upper end of the valve cover is fixedly connected with an actuator link bracket, and the actuator is fixedly connected to the actuator link bracket, the actuator output shaft of the actuator passes through the actuator link bracket to the valve cover, the lower end of the actuator output shaft of the actuator is transmission-connected to the upper end of the valve shaft, a self-lubricating bearing and a bearing pressure ring located above the self-lubricating bearing are arranged between the outer ring of the actuator output shaft of the actuator and the inner ring of the valve cover, a sealing packing is also arranged between the outer ring of the actuator output shaft of the actuator and the inner ring of the valve cover, and a packing pressure plate for pressing down the sealing packing is fixedly connected to the upper end of the valve cover by bolts.

[0017] Preferably, the outer ring of the valve cover is fixedly connected with a fin-shaped high-temperature radiator, the upper end of the valve shaft is fixedly connected with a transmission plate that can rotate and slide in the valve cover, there is a distance between the lower end of the actuator output shaft of the actuator and the transmission plate, the lower end surface of the actuator output shaft of the actuator is provided with a spline groove, a spline shaft is slidably connected in the spline groove, the lower end of the spline shaft is fixedly connected with a transmission pressure plate that can slide and rotate in the valve cover, a through hole that is penetrated and in the shape of an inverted truncated cone is provided on the transmission pressure plate, and the transmission pressure plate connects the valve cover between the transmission plate and the actuator output shaft of the actuator. The interior is divided into a temperature-slowing space and a cooling space located above it. The valve cover located at the cooling space is connected with an inlet pipe and an outlet pipe. The inlet pipe is connected with a first inlet branch pipe and a second inlet branch pipe through a first three-way solenoid valve. The second inlet branch pipe is connected with an intake pump. The outlet pipe is connected with a first outlet branch pipe and a second outlet branch pipe through a second three-way solenoid valve. The first outlet branch pipe is connected with an exhaust pump. The temperature and pressure control system is also included. The temperature and pressure control system controls the operation of the exhaust pump and the intake pump and adjusts the flow path of the pipeline according to the air pressure collected in the temperature-slowing space and the cooling space, and the temperature collected on the valve cover.

[0018] Preferably, the temperature and pressure control system includes a temperature acquisition module, an air pressure acquisition module, and a main control module. The output ends of the temperature acquisition module and the air pressure acquisition module are coupled to the input end of the main control module. The output end of the main control module is respectively coupled to the air extraction pump, the air intake pump, the first three-way solenoid valve, and the second three-way solenoid valve. The temperature acquisition module is used to collect multiple temperatures of the valve cover located on the outer ring of the transmission plate and feed them back to the main control module. The air pressure acquisition module is used to collect the air pressure in the buffer space and the cooling space and feed them back to the main control module. The main control module is used to make a secondary judgment based on the feedback information of the temperature acquisition module and the air pressure acquisition module and control the operation of the air extraction pump, the air intake pump, the first three-way solenoid valve, and the second three-way solenoid valve.

[0019] Preferably, the temperature acquisition module includes a plurality of temperature sensors arranged on the outer ring of the valve cover and located above the high-temperature radiator. There is a detection range on the outer ring of the valve cover between the output shaft of the actuator and the high-temperature radiator. The probes of the plurality of temperature sensors are arranged on the outer ring of the valve cover within the detection range. The plurality of temperature sensors are divided into a plurality of groups. The probes of the temperature sensors in each group are arranged at different heights. The probes of the temperature sensors in the same group are arranged at various locations on the outer ring of the valve cover at the same horizontal height.

[0020] Preferably, the air pressure collection module is used to collect the air pressure in the buffer space and the cooling space and feed it back to the main control module, and includes a lower air pressure sensor and an upper air pressure sensor. The detection end of the lower air pressure sensor is connected to the buffer space, and the detection end of the upper air pressure sensor is connected to the cooling space.

[0021] Preferably, the main control module is used to perform secondary judgment and control the operation of the air extraction pump, the air intake pump, the first three-way solenoid valve, and the second three-way solenoid valve according to the feedback information of the temperature acquisition module and the air pressure acquisition module, including the following steps:

[0022] Store each set of temperature data in a two-dimensional array and calculate the average temperature;

[0023] Traverse the average value array and count the number of groups that exceed the temperature threshold;

[0024] Check whether there is a group that exceeds the temperature threshold, and output a judgment result of yes, otherwise no judgment result is output.

[0025] Preferably, the main control module is used to perform secondary judgment and control the operation of the air extraction pump, the air intake pump, the first three-way solenoid valve, and the second three-way solenoid valve according to the feedback information of the temperature acquisition module and the air pressure acquisition module, and also includes the following steps:

[0026] After a judgment result is yes, the lower air pressure sensor and the upper air pressure sensor are used to continuously collect the air pressure data in the slow-temperature space and the cooling space to obtain the lower air pressure and the upper air pressure;

[0027] Calculate the rate of change of air pressure in the slow temperature space;

[0028] Calculate the rate of change of air pressure in the cooling space;

[0029] Set the pressure change threshold and determine whether it exceeds the pressure change threshold;

[0030] Continuously collect air pressure data and set a time window to observe whether the air pressure changes continue;

[0031] If the continuous state indicator exceeds the threshold value within the time window, the secondary determination result is output as yes, otherwise the secondary determination result is not output.

[0032] Preferably, the main control module is used to perform secondary judgment and control the operation of the air extraction pump, the air intake pump, the first three-way solenoid valve, and the second three-way solenoid valve according to the feedback information of the temperature acquisition module and the air pressure acquisition module, and also includes the following steps:

[0033] After receiving the secondary judgment result as yes, the main control module controls the air intake pump to stop working, the air extraction pump to work, and adjusts the flow path of the pipeline, and the air extraction volume of the air extraction pump is greater than the air intake volume;

[0034] After receiving the command to close the valve, adjust the flow or open the valve, the main control module controls the air intake pump to work, the air extraction pump to stop working, and adjusts the pipeline flow path, and the air intake volume of the air intake pump is greater than the air outlet volume.

[0035] The present invention has the following beneficial effects:

[0036] By analyzing the above physical conflicts, the present invention changes the existing butterfly valve assembly from the side to the top, and at the same time designs the inner cavity of the butterfly valve to be 1-2 specifications larger than the pipeline diameter, and designs the size of the valve seat and the sealing ring to be larger than the design size of the pipeline. At the same time, the strength and flow requirements are calculated according to actual needs, and the actual size of the internal structural originals such as the valve seat, valve shaft, and disc plate is designed by calculating the design flow of the pipeline.

[0037] At the same time, a 15° bell mouth with smooth transition is designed inside the valve body. The inner cavity is enlarged and a smooth transition design is adopted, which effectively reduces the fluid resistance generated when the fluid medium passes through the butterfly valve, reduces the pressure drop loss, saves pipeline kinetic energy, and improves the comprehensive performance of the product.

[0038] The metal valve seat and sealing ring structure design are adopted to effectively achieve an intrinsically safe fireproof structure while improving the product's sealing performance, service life, and pressure-bearing capacity;

[0039] The butterfly valve is made of forgings as a whole, with good mechanical properties and strong pressure-bearing capacity. The valve cover is equipped with high-temperature radiator, temperature and pressure control system and other structures, which effectively reduce the heat conduction of the valve shaft and protect the safety of the packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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.

[0041] Figure 1 It is a structural schematic diagram of the present invention;

[0042] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0043] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0044] 1. Valve body; 2. Plane bearing; 3. Valve shaft; 4. Butterfly plate; 5. Valve seat fixing ring; 6. Metal valve seat; 7. Metal sealing ring; 8. Valve cover; 9. High temperature radiator; 10. Actuator link bracket; 11. Actuator; 12. Actuator output shaft; 13. Packing pressure plate; 14. Sealing packing; 15. Bearing pressure ring; 16. Self-lubricating bearing; 17. Spline groove; 18. Spline shaft; 19. Transmission pressure plate; 20. Through hole; 21. Transmission plate; 22. Temperature buffer space; 23. Cooling space; 24. Inlet pipe; 25. First three-way solenoid valve; 26. First inlet branch pipe; 27. Second inlet branch pipe; 28. Inlet pump; 29. ​​Outlet pipe; 30. Second three-way solenoid valve; 31. First outlet branch pipe; 32. Air pump; 33. Second outlet branch pipe. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] A full-bore high-temperature and high-pressure butterfly valve, such as Figure 1 As shown, it includes a valve body 1, and the valve body 1 includes two inlets and an inner cavity connected to the two inlets. The inlet is used to communicate with the pipeline and its diameter is the same as the pipeline diameter. The diameter of the inner cavity is 1-2 specifications larger than the pipeline diameter. The valve body 1 located at the inlet and the inner cavity is set to have a 15° flare for smooth transition;

[0052] The top surface of the valve body 1 is provided with an opening communicating with the inner cavity. A valve cover 8 capable of closing the opening is connected to the valve body 1 by bolts. The valve cover 8 is in an inverted T shape. A valve shaft 3 extending into the valve body 1 is rotatably connected in the valve cover 8. The lower end of the valve shaft 3 is fixedly connected to a plane bearing 2 in the valve body 1. A butterfly plate 4 is detachably connected to the valve shaft 3. The valve body 1 located in the inner cavity is detachably connected to a metal valve seat 6 through a valve seat fixing ring 5. A metal sealing ring 7 capable of contacting the metal valve seat 6 is fixedly connected to the butterfly plate 4.

[0053] like Figure 2 As shown, the upper end of the valve cover 8 is fixedly connected with an actuator 11 link bracket 10, and the actuator 11 is fixedly connected to the actuator 11 link bracket 10. The actuator 11 output shaft of the actuator 11 passes through the actuator 11 link bracket 10 to the valve cover 8. The lower end of the actuator 11 output shaft of the actuator 11 is transmission connected with the upper end of the valve shaft 3. A self-lubricating bearing 16 and a bearing pressure ring 15 located above the self-lubricating bearing 16 are arranged between the outer ring of the actuator 11 output shaft of the actuator 11 and the inner ring of the valve cover 8. A sealing packing 14 is also arranged between the outer ring of the actuator 11 output shaft of the actuator 11 and the inner ring of the valve cover 8. The upper end of the valve cover 8 is fixedly connected with a packing pressure plate 13 for pressing down the sealing packing 14 by bolts.

[0054] The specification refers to the nominal diameter. In order to reduce the resistance and pressure drop loss when the fluid flows inside the butterfly valve, the valve body 1 at the inlet and the inner cavity is specially designed with a 15° trumpet-shaped expansion. This design not only increases the volume of the inner cavity, but also effectively reduces the energy loss of the fluid medium when it flows through by means of smooth transition.

[0055] In order to adapt to the diameter of the pipeline, the inner cavity of the valve body 1 is designed to be 1 to 2 specifications larger than the diameter of the pipeline. At the same time, the sizes of the metal valve seat 6 and the metal sealing ring 7 also exceed the design size of the pipeline accordingly. This design means that the traditional side assembly method is no longer applicable, because the size of the valve seat exceeds the inner diameter of the pipeline and cannot be assembled from the side. Therefore, the traditional side assembly is transformed into assembly from the top to ensure that the butterfly valve can be installed smoothly.

[0056] Preferably, if Figure 1 and Figure 3As shown, the outer ring of the valve cover 8 is fixedly connected with a fin-shaped high-temperature radiator 9, the upper end of the valve shaft 3 is fixedly connected with a transmission plate 21 that can rotate and slide in the valve cover 8, and there is a gap between the lower end of the actuator 11 output shaft of the actuator 11 and the transmission plate 21. The lower end surface of the actuator 11 output shaft of the actuator 11 is provided with a spline groove 17, and a spline shaft 18 is slidably connected in the spline groove 17. The lower end of the spline shaft 18 is fixedly connected with a transmission pressure plate 19 that can slide and rotate in the valve cover 8. A through hole 20 that is arranged through and in the shape of an inverted truncated cone is provided on the transmission pressure plate 19. The transmission pressure plate 19 separates the valve cover 8 between the transmission plate 21 and the actuator 11 output shaft of the actuator 11 into a buffer. The warm space 22 and the cooling space 23 located above it, the valve cover 8 located at the cooling space 23 is connected with an inlet pipe 24 and an outlet pipe 29, the inlet pipe 24 is connected with a first inlet branch pipe 26 and a second inlet branch pipe 27 through a first three-way solenoid valve 25, the second inlet branch pipe 27 is connected with an intake pump 28, the outlet pipe 29 is connected with a first outlet branch pipe 31 and a second outlet branch pipe 33 through a second three-way solenoid valve 30, the first outlet branch pipe 31 is connected with an exhaust pump 32, and also includes a temperature and pressure control system, which controls the exhaust pump 32 and the intake pump 28 to work and adjust the pipeline flow path according to the air pressure collected in the warming space 22 and the cooling space 23, and the temperature collected on the valve cover 8.

[0057] The high-temperature radiator 9 can be made of copper to increase the heat exchange area between the valve cover 8 and the outside air, and then dissipate heat. If the temperature and pressure control system detects that the temperature of the valve cover 8 exceeds the threshold value and causes the volume and air pressure of the slow-temperature space 22 and the cooling space 23 to change, it means that the heat has been transferred to the position of the valve cover 8 biased towards the upper end. At this time, it is necessary to control the air intake pump 28 to stop working, the air extraction pump 32 to work, and adjust the pipeline flow path, and the air extraction volume of the air extraction pump 32 is greater than the air intake volume, so that under the adjustment of the air pressure, the transmission pressure plate 19 is displaced upward, and the transmission pressure plate 19 can be separated from the transmission plate 21. At this time, the heat can only be transferred through the valve cover 8, and in this process, the operation of the air extraction pump 32 makes the air flow quickly, and then the air quickly takes away the heat, so that the temperature at this place drops rapidly, avoiding the heat from being further transferred upward through the valve shaft 3 and the valve cover 8, avoiding the actuator 11 from being damaged by the influence of high temperature, and also preventing the sealing packing 14 from expanding and aging due to high temperature.

[0058] Preferably, the temperature and pressure control system includes a temperature acquisition module, an air pressure acquisition module, and a main control module. The output ends of the temperature acquisition module and the air pressure acquisition module are coupled to the input end of the main control module. The output end of the main control module is coupled to the air extraction pump 32, the air intake pump 28, the first three-way solenoid valve 25, and the second three-way solenoid valve 30 respectively. The temperature acquisition module is used to collect multiple temperatures of the valve cover 8 located on the outer ring of the transmission plate 21 and feed them back to the main control module. The air pressure acquisition module is used to collect the air pressure in the slow temperature space 22 and the cooling space 23 and feed them back to the main control module. The main control module is used to make a secondary judgment based on the feedback information of the temperature acquisition module and the air pressure acquisition module and control the air extraction pump 32, the air intake pump 28, the first three-way solenoid valve 25, and the second three-way solenoid valve 30 to work;

[0059] The temperature acquisition module includes a plurality of temperature sensors arranged on the outer ring of the valve cover 8 and located above the high-temperature radiator 9. The outer ring of the valve cover 8 has a detection range between the output shaft of the actuator 11 and the high-temperature radiator 9. The probes of the plurality of temperature sensors are arranged on the outer ring of the valve cover 8 within the detection range. The plurality of temperature sensors are divided into a plurality of groups. The probes of each group of temperature sensors are arranged at different heights. The probes of the same group of temperature sensors are arranged at various locations of the outer ring of the valve cover 8 at the same horizontal height.

[0060] The air pressure collection module is used to collect the air pressure in the buffer space 22 and the cooling space 23 and feed it back to the main control module. It includes a lower air pressure sensor and an upper air pressure sensor. The detection end of the lower air pressure sensor is connected to the buffer space 22, and the detection end of the upper air pressure sensor is connected to the cooling space 23.

[0061] The temperature acquisition module in the temperature and pressure control system can perform multiple detections on the outer ring temperature of the valve cover 8 within the detection range, so as to ensure that the final output temperature data is more accurate and avoid the situation where the local temperature is too high. The air pressure acquisition module collects the air pressure in the buffer space 22 and the cooling space 23. Through the collection of air pressure, it is judged whether the air pressure balance will be destroyed due to high temperature when the transmission pressure plate 19 does not move and the air pressure in the buffer space 22 and the cooling space 23 remains constant. If the air pressure balance is destroyed, it can further indicate that the high temperature is transmitted to the position of the valve cover 8 within the detection range, avoiding misjudgment.

[0062] Preferably, the main control module is used to make a secondary judgment based on the feedback information of the temperature acquisition module and the air pressure acquisition module and control the operation of the air extraction pump 32, the air intake pump 28, the first three-way solenoid valve 25, and the second three-way solenoid valve 30, including the following steps:

[0063] Store each set of temperature data in a two-dimensional array and calculate the average temperature;

[0064] Traverse the average value array and count the number of groups that exceed the temperature threshold;

[0065] Check whether there is a group that exceeds the temperature threshold, and output a judgment result of yes, otherwise no judgment result is output.

[0066] Preferably, the main control module is used to make a secondary judgment based on the feedback information of the temperature acquisition module and the air pressure acquisition module and control the operation of the air extraction pump 32, the air intake pump 28, the first three-way solenoid valve 25, and the second three-way solenoid valve 30, including the following steps:

[0067] After a judgment result is yes, the lower air pressure sensor and the upper air pressure sensor respectively continuously collect the air pressure data in the slow temperature space 22 and the cooling space 23 to obtain the lower air pressure and the upper air pressure;

[0068] Calculate the rate of change of air pressure in the slow temperature space 22;

[0069] Calculate the rate of change of air pressure in the cooling space 23;

[0070] Set the pressure change threshold and determine whether it exceeds the pressure change threshold;

[0071] Continuously collect air pressure data and set a time window to observe whether the air pressure changes continue;

[0072] If the continuous state indicator exceeds the threshold value within the time window, the secondary determination result is output as yes, otherwise the secondary determination result is not output.

[0073] Preferably, the main control module is used to make a secondary judgment based on the feedback information of the temperature acquisition module and the air pressure acquisition module and control the operation of the air extraction pump 32, the air intake pump 28, the first three-way solenoid valve 25, and the second three-way solenoid valve 30, including the following steps:

[0074] After receiving the secondary determination result as yes, the main control module controls the air intake pump 28 to stop working, the air extraction pump 32 to work, and adjusts the flow path of the pipeline, and the air extraction amount of the air extraction pump 32 is greater than the air intake amount;

[0075] After receiving the valve closing instruction, flow adjustment or valve opening instruction, the main control module controls the air intake pump 28 to work, the air extraction pump 32 to stop working, and adjusts the pipeline flow path, and the air intake volume of the air intake pump 28 is greater than the air outlet volume.

[0076] Through the above method, two judgments can be made, and then it can be determined whether the position where the detection range of the valve cover 8 is located is affected by high temperature. If this happens, the transmission pressure plate 19 can be separated from the transmission plate 21, and then a large amount of heat can be taken away by the flow of air. On the contrary, if adjustment is required, it is only necessary to operate the intake pump 28, so that the transmission pressure plate 19 presses the transmission plate 21, and then the actuator 11 drives the transmission pressure plate 19 to rotate through the sequence of the actuator 11 output shaft, the spline groove 17 and the spline shaft 18. The transmission pressure plate 19 drives the transmission plate 21 to rotate through friction. Once the transmission plate 21 rotates, the valve shaft 3 will drive the butterfly plate 4 to rotate in the valve body 1, and then complete the opening, adjustment, and closing actions.

[0077] 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 full-bore high-temperature and high-pressure butterfly valve, characterized in that: The valve body (1) comprises two inlets and an inner cavity connected to the two inlets, the inlets are used to be connected to a pipeline and have a diameter that is the same as the diameter of the pipeline, the diameter of the inner cavity is 1-2 specifications larger than the diameter of the pipeline, and the valve body (1) located at the inlet and the inner cavity is set to have a 15° flare for smooth transition; The top surface of the valve body (1) is provided with an opening communicating with the inner cavity. The valve body (1) is connected to a valve cover (8) capable of closing the opening by bolts. The valve cover (8) is in an inverted T-shape. A valve shaft (3) extending into the valve body (1) is rotatably connected to the valve cover (8). The lower end of the valve shaft (3) is fixedly connected to a plane bearing (2) in the valve body (1). A butterfly plate (4) is detachably connected to the valve shaft (3). The valve body (1) located in the inner cavity is detachably connected to a metal valve seat (6) by a valve seat fixing ring (5). A metal sealing ring (7) capable of contacting the metal valve seat (6) is fixedly connected to the butterfly plate (4). The upper end of the valve cover (8) is fixedly connected to an actuator (11) link bracket (10). The actuator (11) link bracket (10) is fixedly connected with an actuator (11), the actuator (11) output shaft of the actuator (11) passes through the actuator (11) link bracket (10) to the valve cover (8), the lower end of the actuator (11) output shaft of the actuator (11) is drivingly connected to the upper end of the valve shaft (3), a self-lubricating bearing (16) and a bearing pressure ring (15) located above the self-lubricating bearing (16) are arranged between the outer ring of the actuator (11) output shaft of the actuator (11) and the inner ring of the valve cover (8), a sealing packing (14) is also arranged between the outer ring of the actuator (11) output shaft of the actuator (11) and the inner ring of the valve cover (8), and the upper end of the valve cover (8) is fixedly connected with a packing pressure plate (13) for pressing down the sealing packing (14) by bolts; The outer ring of the valve cover (8) is fixedly connected to a fin-shaped high-temperature heat sink (9); the upper end of the valve shaft (3) is fixedly connected to a transmission plate (21) that is rotatable and slidable in the valve cover (8); a spacing exists between the lower end of the actuator (11) output shaft of the actuator (11) and the transmission plate (21); a spline groove (17) is provided on the lower end surface of the actuator (11) output shaft of the actuator (11); a spline shaft (18) is slidably connected in the spline groove (17); the lower end of the spline shaft (18) is fixedly connected to a transmission pressure plate (19) that is slidable and rotatable in the valve cover (8); a through hole (20) that is arranged through and is in the shape of an inverted truncated cone is provided on the transmission pressure plate (19); the transmission pressure plate (19) separates the valve cover (8) between the transmission plate (21) and the actuator (11) output shaft of the actuator (11) into A temperature-slowing space (22) and a cooling space (23) located above the temperature-slowing space (22); the valve cover (8) located at the cooling space (23) is connected to an inlet pipe (24) and an outlet pipe (29); the inlet pipe (24) is connected to a first inlet branch pipe (26) and a second inlet branch pipe (27) via a first three-way solenoid valve (25); the second inlet branch pipe (27) is connected to an air intake pump (28); the outlet pipe (29) is connected to a first outlet branch pipe (31) and a second outlet branch pipe (33) via a second three-way solenoid valve (30); the first outlet branch pipe (31) is connected to an air extraction pump (32); and the temperature-pressure control system is further provided. The temperature-pressure control system controls the operation of the air extraction pump (32) and the inlet pump (28) and adjusts the flow path of the pipeline according to the air pressure collected in the temperature-slowing space (22) and the cooling space (23) and the temperature collected on the valve cover (8).

2. A full-bore high-temperature and high-pressure butterfly valve according to claim 1, characterized in that: The temperature and pressure control system comprises a temperature acquisition module, an air pressure acquisition module, and a main control module. The output ends of the temperature acquisition module and the air pressure acquisition module are coupled to the input end of the main control module. The output end of the main control module is respectively coupled to an air extraction pump (32), an air intake pump (28), a first three-way solenoid valve (25), and a second three-way solenoid valve (30). The temperature acquisition module is used to acquire temperatures at multiple locations of a valve cover (8) located on the outer ring of a transmission plate (21) and to feed back the temperatures to the main control module. The air pressure acquisition module is used to acquire air pressures in a temperature-slowing space (22) and a temperature-lowering space (23) and to feed back the temperatures to the main control module. The main control module is used to perform secondary judgment based on feedback information from the temperature acquisition module and the air pressure acquisition module and to control the operation of the air extraction pump (32), the air intake pump (28), the first three-way solenoid valve (25), and the second three-way solenoid valve (30).

3. A full-bore high-temperature and high-pressure butterfly valve according to claim 2, characterized in that: The temperature acquisition module comprises a plurality of temperature sensors arranged on the outer ring of the valve cover (8) and located above the high-temperature radiator (9); the outer ring of the valve cover (8) has a detection range located between the output shaft of the actuator (11) and the high-temperature radiator (9); the probes of the plurality of temperature sensors are arranged on the outer ring of the valve cover (8) within the detection range; the plurality of temperature sensors are divided into a plurality of groups; the probes of the temperature sensors in each group are arranged at different heights; and the probes of the temperature sensors in the same group are arranged at various locations on the outer ring of the valve cover (8) at the same horizontal height.

4. A full-bore high-temperature and high-pressure butterfly valve according to claim 2, characterized in that: The air pressure acquisition module is used to collect the air pressure in the temperature-slowing space (22) and the temperature-reducing space (23) and feed it back to the main control module, and comprises a lower air pressure sensor and an upper air pressure sensor, wherein the detection end of the lower air pressure sensor is connected to the temperature-slowing space (22), and the detection end of the upper air pressure sensor is connected to the temperature-reducing space (23).

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