A pneumatic shut-off ball valve

Abstract

This invention discloses a pneumatic shut-off ball valve, belonging to the field of valve technology, comprising: a valve body, a valve core, sealing rings, a separating sealing gasket, an oil guide pipe, an extension pipe, a rotating shaft, a fixed disc, and a sliding disc. This invention employs a sealing structure composed of two sets of sealing rings for the valve core. The wear condition of the sealing structure is obtained by detecting pressure changes in the heat-conducting oil within the heat-conducting oil cavity between the sealing rings and the valve body. When wear occurs in the sealing structure composed of the two sets of sealing rings, the heat-conducting oil converts the minute wear into a precisely measurable hydraulic signal. By detecting changes in the heat-conducting oil pressure through an oil pressure sensor, an early warning message can be issued when the sealing structure fails due to wear or internal leakage occurs, thus achieving a leakage warning effect. The sliding disc rotates relative to the fixed disc to change the heat-conducting oil pressure, and the pressure change is detected by the oil pressure sensor, enabling the determination of the ball valve's on / off state, thus facilitating the use of the equipment.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a pneumatic shut-off ball valve. Background Technology

[0002] As a key actuator in industrial automation systems, pneumatic shut-off ball valves are designed to quickly and reliably shut off pipeline media. However, in industries such as petrochemicals, pharmaceuticals, food processing, and resin transportation, which involve high-viscosity, easily solidified, or temperature-sensitive materials, the application of traditional pneumatic ball valves faces severe challenges.

[0003] First, regarding sealing reliability, the sealing rings of traditional ball valves wear down after long-term use, leading to internal leakage. Currently, there is a lack of effective means to monitor the sealing status, and maintenance can usually only be carried out passively after the valve performance has seriously deteriorated or leakage has occurred. This not only affects the continuity of production but may also cause safety and environmental accidents. Predictive maintenance is difficult to achieve. Second, when dealing with high-viscosity or easily solidified materials, the residual material in the valve cavity is very easy to solidify in shutdown or low-temperature environments, which may cause the valve core to be stuck and unable to operate normally. After restoration, the conduction status of the ball valve cannot be detected, and the valve core angle needs to be calibrated. Although the existing technology usually uses external jacket heating to insulate the valve body, this method has low thermal efficiency and poor direct temperature control effect on the valve core. It is difficult to ensure the flow of materials in the internal channel of the valve core. Heating the entire valve body can easily lead to aging of internal seals. Furthermore, the seat seal of traditional ball valves mainly relies on the medium pressure or spring preload to achieve self-tightening sealing. This sealing structure has no ability to detect the wear status of the sealing ring and cannot provide early warning before leakage occurs.

[0004] Therefore, there is an urgent need in this field for an intelligent pneumatic shut-off ball valve that integrates active sealing, condition monitoring and precise temperature control to solve the aforementioned long-standing technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a pneumatic shut-off ball valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pneumatic shut-off ball valve, comprising: a valve body having an internal cavity; a valve core rotatably disposed within the valve body with a channel in its center, wherein a heat-conducting oil cavity is formed between the valve body and the valve core; two sealing rings symmetrically disposed within the valve body, the two sealing rings slidingly fitting against both sides of the valve core, and a hemispherical extended sealing gasket fixedly disposed on the side of each of the two sealing rings that are close to each other; and two separating sealing gaskets symmetrically disposed in the middle of the inner walls on both sides of the valve body, wherein the extended sealing gaskets and the separating sealing gaskets form a package. The valve core is sealed by a gasket that divides the heat-conducting oil chamber into two parts. Two sets of oil guide pipes are symmetrically fixed to the outside of the valve body, each set consisting of two pipes, both connected to the heat-conducting oil chamber. Two extension pipes are connected to the two sets of oil guide pipes respectively. A heat-conducting pipe is fixed between the two extension pipes in each set. A three-way valve is fixed in the middle of each set of two extension pipes. An oil pressure sensor is fixed in the middle of one three-way valve, and an oil injection valve is fixed in the middle of the other three-way valve. A rotating shaft is inserted into the top of the valve core and is rotatably and sealingly connected to the valve body.

[0007] Preferably, it further includes: two annular grooves, each located at one end of the valve core; four lips, each fixedly located at one end of two extended sealing gaskets, the four lips being semi-circular structures and located within the two annular grooves; the heat-conducting oil in the heat-conducting oil chamber applies pressure to the lips so that the lips mechanically engage with the annular grooves to ensure the sealing effect of the valve core; when the lips, extended sealing gaskets, and sealing rings wear, the pressure of the heat-conducting oil changes; the oil pressure sensor detects the pressure change of the heat-conducting oil to detect the wear of the lips, extended sealing gaskets, and sealing rings.

[0008] Preferably, it further includes: a deformation cavity located inside the lip, wherein the top of the outer wall of the lip is set as an inclined surface, and the lip is deformed along the deformation cavity under the influence of the pressure of the heat transfer oil and fits tightly with the annular groove to ensure the sealing effect when the valve core rotates.

[0009] Preferably, it further includes: splicing blocks, which are provided in two and fixedly disposed in the middle of the two separating sealing gaskets respectively, and splicing grooves adapted to the splicing blocks are provided at both ends of the outer side wall of the extended sealing gasket, and the splicing grooves and splicing blocks are used to ensure the seal between the extended sealing gasket and the separating sealing gasket.

[0010] Preferably, it further includes: a heating cover, which is fixedly disposed on the outside of the valve body and has a heat-conducting liquid inside, and both heat-conducting pipes are fixedly disposed inside the heating cover; an electric heating pipe, which is fixedly disposed inside the heating cover, and the electric heating pipe heats the heat-conducting oil inside the heat-conducting pipe through the heat-conducting liquid, thereby controlling the valve core temperature and preventing the material from solidifying.

[0011] Preferably, it further includes: a shaft hole that passes through the middle of the top of the valve body; a pneumatic actuator that is fixedly disposed at the top of the valve body and whose output end is fixedly connected to the top of the rotating shaft, the pneumatic actuator being used to provide power to the rotating shaft to make the valve core rotate.

[0012] Preferably, it further includes: an annular sealing groove, which is formed in the middle of the valve body and located in the middle section of the rotating shaft; and an annular sealing gasket, which is fixedly disposed inside the annular sealing groove to enhance the relative sealing between the rotating shaft and the valve body.

[0013] Preferably, it further includes: two connecting seats located at both ends of the valve body; two annular seats fixedly disposed on the side of the two connecting seats near the valve body, the two annular seats being threadedly installed at both ends inside the valve body, and the two sealing rings being disposed inside the two annular seats.

[0014] Preferably, it further includes: two connecting flanges, each fixedly mounted on the side of the two connecting seats away from the valve body, the connecting flanges being used to connect the valve body to the pipeline; and an alarm, fixedly mounted on the outside of the valve body and electrically connected to the oil pressure sensor, the oil pressure sensor detecting changes in the pressure of the heat transfer oil to determine when the lip, extension gasket, and sealing ring are worn, and issuing an alarm message through the alarm.

[0015] Preferably, it further includes: a fixed plate, which is fixedly connected to the inside of the valve body and placed in the heat transfer oil cavity, and the lower end face of the fixed plate is a wavy slope; A sliding disc is slidably fitted on the outside of the rotating shaft, with its top surface matching the bottom surface of the fixed disc; a movable ring is slidably fitted on the outside of the rotating shaft, with its top surface abutting against the sliding disc, and the movable ring is placed inside the heat-conducting oil cavity; a temperature-sensitive elastic element is fitted on the outside of the rotating shaft and fixedly connected to the bottom of the movable ring, used to push the sliding disc into contact with the fixed disc; the rotating shaft is rotatably located in the middle of the shaft hole, and a plug is fixedly connected to its bottom, the plug being placed on top of the valve core, and the temperature-sensitive elastic element is fixedly connected to the plug.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention employs a valve core sealing structure composed of two sets of sealing rings. The wear condition of the sealing structure is obtained by detecting pressure changes in the heat transfer oil within the heat transfer oil chamber between the sealing rings and the valve body. When wear occurs in the sealing structure composed of the two sets of sealing rings, the heat transfer oil converts the minute wear into a precisely measurable hydraulic signal. By detecting changes in the heat transfer oil pressure through an oil pressure sensor, an early warning message can be issued when the sealing structure fails due to wear and internal leakage occurs, thus achieving a leakage warning effect. By setting two detachable connecting seats at both ends of the valve body, the sealing structure can be replaced by removing the connecting seats. This invention achieves equipment leakage warning while reducing the difficulty of equipment maintenance and facilitating equipment use.

[0017] 2. This invention achieves the purpose of monitoring the conduction status of the ball valve by setting a fixed plate and a sliding plate. The sliding plate moves relative to the fixed plate through the rotating shaft, changing the pressure in the heat transfer oil chamber. The rotation angle of the valve core is determined by the pressure value monitored by the oil pressure sensor, thereby avoiding the problem of not being able to determine the conduction status of the ball valve due to the failure of the drive component.

[0018] 3. This invention improves the heat preservation effect of the valve body by setting a movable ring and a temperature-sensitive elastic element. The temperature-sensitive elastic element drives the movable ring to slide back and forth by temperature changes, which promotes the flow of heat transfer oil in the heat transfer oil cavity, improves the temperature uniformity of the heat transfer oil, improves thermal efficiency, and ensures the fluidity of materials in the valve core.

[0019] 4. This invention establishes a heat-conducting oil channel composed of a connecting pipe, an oil guide pipe, an extension pipe, and a heat-conducting pipe. A heating cover is installed outside the heat-conducting pipe, and an electric heating tube inside the heating cover heats the heat-conducting oil inside the heat-conducting pipe. The heat-conducting oil then transfers heat to the valve core, thereby controlling the temperature of the material inside the valve core. This prevents the material from solidifying and causing the valve core to jam. At the same time, the electric heating tube ensures a constant temperature of the heat-conducting oil, which in turn ensures a constant pressure. As a result, when the sealing structure wears, the oil pressure sensor can accurately detect changes in the pressure of the heat-conducting oil, thus improving the early warning accuracy of the device.

[0020] 5. This invention achieves sealing between the sealing ring and the valve core by using a mechanical interlocking method of lip and annular groove. After the heat transfer oil is injected into the heat transfer oil chamber, the lip on one side of the sealing ring mechanically interlocks with the annular groove under pressure. The mechanical interlocking combined with the pressure of the heat transfer oil achieves a double seal between the sealing ring and the valve core, effectively improving the sealing effect between the valve core and the sealing ring. Furthermore, even when the sealing ring is worn, the lip still maintains interlocking with the annular groove under the pressure of the heat transfer oil, reducing the probability of device leakage. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a rear view schematic diagram of the overall structure of the present invention.

[0023] Figure 3 This is a cross-sectional view of the overall structure of the present invention.

[0024] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0025] Figure 5 This is a schematic cross-sectional view of the overall structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the valve body structure of the present invention.

[0027] Figure 7 This is an exploded view of the overall structure of the present invention.

[0028] Figure 8 This is a schematic diagram of the sealing ring and valve core structure of the present invention.

[0029] Figure 9 This is a schematic diagram of the combined state of the sealing ring and valve core structure of the present invention.

[0030] Figure 10 This is a schematic diagram of the extension tube structure of the present invention.

[0031] Figure 11 This is a schematic diagram of the heating cover structure of the present invention.

[0032] Figure 12 This is a schematic diagram showing the relative positions of the fixed disk and the sliding disk in this invention.

[0033] Figure 13 This is a schematic diagram showing the disassembly of the fixed disk and the sliding disk in this invention.

[0034] In the diagram: 1. Valve body; 11. Shaft hole; 12. Annular sealing gasket; 13. Rotating shaft; 131. Movable groove; 132. Insert block; 14. Pneumatic actuator; 2. Valve core; 21. Annular sealing groove; 22. Annular groove; 3. Sealing ring; 31. Extended sealing gasket; 32. Lip; 321. Deformation cavity; 33. Splicing groove; 34. Separating sealing gasket; 35. Splicing block; 4. Heat-conducting oil chamber; 41. Oil guide pipe; 42. Extended pipe; 43. Three-way valve; 431. Oil pressure sensor; 432. Oil injection valve; 44. Heating cover; 45. Heat-conducting pipe; 46. Electric heating element; 5. Alarm; 6. Connecting seat; 61. Annular seat; 62. Connecting flange; 7. Fixed plate; 8. Sliding plate; 9. Temperature-sensing elastic element; 10. Movable ring. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1 like Figures 1 to 11 and Figure 13As shown, the pneumatic shut-off ball valve provided by the present invention is essentially a pneumatic shut-off ball valve that can detect wear of the internal sealing structure of the ball valve and provide early warning. By using two sets of sealing rings 3 to form the sealing structure of the valve core 2, the wear condition of the sealing structure is obtained by detecting the pressure change of the heat transfer oil in the heat transfer oil cavity 4 between the sealing rings 3 and the valve body 1. When the sealing structure composed of the two sets of sealing rings 3 wears, the heat transfer oil converts the small wear into a hydraulic signal that can be accurately measured. By detecting the change of heat transfer oil pressure through the oil pressure sensor 431, an early warning information can be issued when the sealing structure wears and fails or internal leakage occurs.

[0037] In terms of specific structure, the structure body can be constructed according to the inventive concept of this embodiment. In this embodiment, no special limitations are made.

[0038] In this embodiment, a pneumatic shut-off ball valve includes: a valve body 1 with an internal cavity; a valve core 2 rotatably disposed inside the valve body 1 with a channel in the middle, forming a heat-conducting oil chamber 4 between the valve body 1 and the valve core 2; two annular grooves 22 respectively disposed at both ends of the valve core 2; a shaft hole 11 penetrating the middle of the top end of the valve body 1; a rotating shaft 13 inserted into the top of the valve core 2 and rotatably connected to the valve body 1; and a pneumatic actuator 14 fixedly disposed at the top end of the valve body 1 with its output end fixedly connected to the top end of the rotating shaft 13. The pneumatic actuator 14 provides power to the rotating shaft 13 to rotate the valve core 2. The pneumatic actuator 14 uses a pneumatic component capable of outputting torque, such as a pneumatic motor. Alternatively, other energy-driven components, such as an electric motor or a stepper motor, can be selected according to usage requirements. During use, the pneumatic actuator 14 is connected to a corresponding controller.

[0039] An annular sealing groove 21 is formed in the middle of the valve body 1 and positioned in the middle section of the rotating shaft 13. An annular sealing gasket 12 is fixedly disposed inside the annular sealing groove 21, with its inner side fitting against the rotating shaft 13 to enhance the relative sealing between the rotating shaft 13 and the valve body 1. Two sealing rings 3 are provided symmetrically inside the valve body 1, and the two sealing rings 3 slide against the two sides of the valve core 2 respectively. A hemispherical extended sealing gasket 31 is fixedly provided on the side of the two sealing rings 3 that are close to each other. Two separating sealing gaskets 34 are provided symmetrically in the middle of the inner walls on both sides of the valve body 1. The extended sealing gaskets 31 and the separating sealing gaskets 34 form a sealing structure that wraps around the valve core 2. The separating sealing gaskets 34 divide the heat transfer oil cavity 4 into two parts. Four lips 32 are provided and fixedly disposed at both ends of the two extended sealing gaskets 31 respectively. The four lips 32 are all semi-circular structures and are located in the two annular grooves 22 respectively.

[0040] The heat transfer oil in the heat transfer oil cavity 4 applies pressure to the lip 32 so that the lip 32 and the annular groove 22 mechanically engage, thereby ensuring the sealing effect of the valve core 2. When wear occurs on the lip 32, the extended sealing gasket 31, and the sealing ring 3, the pressure of the heat transfer oil changes. The oil pressure sensor 431 detects the wear of the lip 32, the extended sealing gasket 31, and the sealing ring 3 by detecting the pressure change of the heat transfer oil. The deformation cavity 321 is located inside the lip 32. The top of the outer wall of the lip 32 is set as an inclined surface. The lip 32 is affected by the pressure of the heat transfer oil and moves along... The deformation cavity 321 deforms and fits tightly with the annular groove 22 to ensure the sealing effect when the valve core 2 rotates. The inclined surface design can amplify the pressure effect of the heat transfer oil on the lip 32 to ensure that the lip 32 can fit tightly with the annular groove 22. There are two splicing blocks 35, which are respectively fixed in the middle of the two separating sealing gaskets 34. Both ends of the outer side wall of the extension sealing gasket 31 are provided with splicing grooves 33 that are adapted to the splicing blocks 35. The splicing grooves 33 and the splicing blocks 35 are used to ensure the sealing effect between the extension sealing gasket 31 and the separating sealing gasket 34.

[0041] Two sets of oil guide pipes 41 are symmetrically fixed on the outside of the valve body 1. Each set of oil guide pipes 41 includes two pipes, and both sets of oil guide pipes 41 are connected to the heat-conducting oil chamber 4. Two sets of extension pipes 42 are provided and connected to the two sets of oil guide pipes 41 respectively. A heat-conducting pipe 45 is fixed between the two extension pipes 42 in each set. A three-way valve 43 is fixed in the middle of the two extension pipes 42 in each set. An oil pressure sensor 431 is fixed in the middle of one three-way valve 43, and an oil injection valve 432 is fixed in the middle of the other three-way valve 43. A heating cover 44 is fixed on the outside of the valve body 1 and has a heating element inside. There is a heat-conducting fluid, and two heat-conducting pipes 45 are fixed inside the heating cover 44; an electric heating pipe 46 is fixed inside the heating cover 44. The electric heating pipe 46 heats the heat-conducting oil inside the heat-conducting pipe 45 through the heat-conducting fluid, thereby controlling the temperature of the valve core 2 to prevent the material from solidifying. The electric heating pipe 46 is electrically connected to a corresponding controller and power supply. A temperature sensor should also be provided to monitor the temperature inside the heating cover 44. The controller adjusts the output power of the electric heating pipe 46 to avoid the temperature being too high or too low. The temperature sensor is existing technology and will not be described in detail here. It is not shown in the figure.

[0042] Two connecting flanges 62 are provided and fixedly installed on the side of the two connecting seats 6 away from the valve body 1, and the connecting flanges 62 are used to connect the valve body 1 to the pipeline; the alarm 5 is fixedly installed on the outside of the valve body 1 and electrically connected to the oil pressure sensor 431. The oil pressure sensor 431 detects the pressure change of the heat transfer oil to determine when the lip 32, the extended sealing gasket 31 and the sealing ring 3 are worn, and then sends an alarm message through the alarm 5.

[0043] When using a pneumatic shut-off ball valve according to this embodiment, the main structure of the ball valve consists of the valve body 1, valve core 2, sealing ring 3, and connecting seat 6. The ball valve is connected to the material conveying pipeline through the connecting flange 62 on the outside of the two connecting seats 6. The two sealing rings 3 are located on both sides of the valve core 2 and fill the gap between the valve core 2 and the valve body 1 to achieve sealing of the valve core 2. During the operation of the ball valve, the pneumatic actuator 14 can drive the rotating shaft 13 to rotate when compressed air is injected and discharged. The rotating shaft 13 drives the valve core 2 to rotate to achieve the control of the opening and closing of the ball valve.

[0044] During ball valve installation, two sealing rings 3 are placed into the annular seats 61 inside the two connecting seats 6, and the two annular seats 61 are threaded onto both ends of the valve body 1. After the annular seats 61 are fully tightened, the two sealing rings 3 are respectively fitted to both sides of the valve core 2, and the splicing grooves 33 at both ends of the extended sealing gaskets 31 on the outer side of the two sealing rings 3 respectively engage with the splicing blocks 35 on the inner side of the partition sealing gasket 34 inside the valve body 1. At this time, the sealing rings 3, the extended sealing gaskets 31 and the partition sealing gaskets 34 form a sealing enclosure for the valve core 2. Furthermore, the partition sealing gaskets 34 divide the heat transfer oil cavity 4 between the valve core 2 and the valve body 1 into two parts. Heat transfer oil is injected into the heat transfer oil cavity 4 through two oil injection valves 432. After the heat transfer oil enters the heat transfer oil cavity 4, the lip 32 on the inner side of the sealing ring 3 is squeezed by the pressure of the heat transfer oil and deforms along the deformation cavity 321. The deformed lip 32 The sealing ring 3 fits tightly against the annular groove 22 to ensure a tight fit between the sealing ring 3 and the valve core 2, thus preventing leakage. During the injection of heat transfer oil, the oil pressure sensor 431 monitors the pressure of the heat transfer oil in real time. When the pressure of the heat transfer oil reaches a certain level, the injection of heat transfer oil is stopped and the oil injection valve 432 is closed. At this time, the pressure of the heat transfer oil is stable at a certain index. During the use of the ball valve, when the sealing structure composed of the sealing ring 3 and the extended sealing gasket 31 wears due to the repeated rotation of the valve core 2, a gap is generated on the side of the sealing ring 3 and the extended sealing gasket 31 near the valve core 2 due to wear. At this time, the internal space of the heat transfer oil cavity 4 changes, and correspondingly, the pressure of the heat transfer oil changes. At this time, the high-precision oil pressure sensor 431 can keenly sense the pressure change of the heat transfer oil. When the pressure change of the heat transfer oil exceeds the preset range, the alarm 5 issues an alarm message to remind maintenance personnel to replace and maintain the sealing ring 3.

[0045] Considering that the pressure of the heat transfer oil will also change when the temperature changes, a heat transfer pipe 45 is added to the heat transfer oil channel. The heat transfer pipe 45 is located inside the heating cover 44. During the injection of the heat transfer oil and during the use of the ball valve, the electric heating pipe 46 heats the heat transfer liquid inside the heating cover 44. The heat transfer liquid transfers heat to the heat transfer oil through the heat transfer pipe 45 to control the temperature of the heat transfer oil. This avoids pressure changes in the heat transfer oil due to temperature changes, thereby ensuring the detection accuracy of the device when the sealing structure such as the sealing ring 3 is worn. At the same time, after the heat transfer oil is heated, it heats the material inside the valve core 2 through heat transfer to ensure that the material is in a fluid state and to prevent the material from solidifying and causing the valve core 2 to jam and become unable to rotate.

[0046] It should be noted that the pneumatic actuator 14, hydraulic pressure sensor 431, alarm 5, and other structures mentioned in this embodiment are all corresponding structures in the prior art. Among them, the hydraulic pressure sensor 431 is a high-precision hydraulic pressure sensor 431, and the alarm 5 is composed of a controller, a buzzer, a power supply, and other structures. The controller has a preset control program based on the changes in the data monitored by the hydraulic pressure sensor 431. The control logic of the control program is as follows: After the heat transfer oil is injected and heated to the specified temperature, the reading of the oil pressure sensor 431 is recorded as P0. During the use of the ball valve, the reading of the oil pressure sensor 431 is recorded in real time as P1, and the pressure change of the heat transfer oil is calculated in real time and recorded as ΔP, where ΔP = P0 - P1. When ΔP exceeds the preset threshold in the control program, the control program outputs a start command to the buzzer to issue a warning message. The alarm transmission method of the warning message is a common practice in this field and will not be described in detail here.

[0047] It should be further noted that the sealing structures such as the sealing ring 3, the extended sealing gasket 31, and the lip 32 in this embodiment all use sealing materials commonly used in the valve field. They can be one of a variety of materials such as nitrile rubber, fluororubber, and silicone rubber. The specific model selection can be made according to the valve application scenario and the properties of the conveyed material. Under the condition of ensuring the normal implementation of this embodiment, there are no restrictions on its selection.

[0048] Example 2 In practical use, it was found that the pneumatic actuator 14 is not easy to accurately control the rotation angle, and the stepper motor and other drive components are also prone to step loss. Therefore, it is easy to be unable to determine the on / off state of the ball valve during use. The heat transfer oil in the heat transfer pipe 45 cannot circulate, which can easily lead to some heat transfer oil in the heating cover 44 having a higher temperature and the heat transfer oil chamber 4 having a lower temperature, resulting in uneven temperature of the heat transfer pipe 45, which affects the heating effect of the material. Therefore, the relevant components of this device have been further improved.

[0049] Specifically, such as Figures 12 to 13As shown, it also includes a fixed plate 7, which is fixedly connected to the inside of the valve body 1 and placed in the heat transfer oil cavity 4. The lower end face of the fixed plate 7 is a wavy slope. The fixed plate 7 is sleeved on the outside of the rotating shaft 13 and is coaxial with the rotating shaft 13. A sliding plate 8 is slidably sleeved on the outside of the rotating shaft 13, and its top surface is adapted to the bottom surface of the fixed plate 7. A boss is fixedly connected to the inner side of the sliding plate 8. A movable groove 131 is opened on the rotating shaft 13 at the position corresponding to the boss. The sliding plate 8 and the rotating shaft 13 are slidably sealed together. The outer side of the sliding plate 8 is sealed to the inner side of the valve body 1. An insert block 132 is fixedly connected to the bottom of the rotating shaft 13. The top of the valve core 2 is placed on top of the valve core 2; the top of the insert 132 is inserted into the movable groove 131 to ensure that the insert 132 rotates synchronously with the rotating shaft 13, and the insert 132 and the rotating shaft 13 are connected by bolts; the movable ring 10 is slidably fitted on the outside of the rotating shaft 13, and its top abuts against the sliding plate 8. The movable ring 10 is placed in the heat-conducting oil cavity 4, and there is a gap between the outside of the movable ring 10 and the valve body 1; the temperature-sensing elastic element 9 is fitted on the outside of the rotating shaft 13 and is fixedly connected to the bottom of the movable ring 10, and its other end is fixedly connected to the top of the insert 132. In the initial state, the temperature-sensing elastic element 9 pushes the sliding plate 8 to contact the fixed plate 7.

[0050] It should be noted that the temperature-sensitive elastic element 9 is made of shape memory alloy material, which can shrink when the temperature rises (when the temperature reaches the phase transition temperature of the shape memory alloy). The shape memory alloy material that shrinks when heated is existing technology and will not be described in detail here.

[0051] With the ball valve fully open / closed, there is a gap between the sliding disc 8 and the fixed disc 7. During use, the temperature-sensitive elastic element 9 can cause the movable ring 10 to move relative to the sliding disc 8 due to changes in the temperature of the heat transfer oil. At this time, the heat transfer oil in the heat transfer oil chamber 4 is affected by the movable ring 10 and flows. When the movable ring 10 slides downward, the heat transfer oil enters the space between the movable ring 10 and the sliding disc 8 through the gap between the movable ring 10 and the valve body 1. When the movable ring 10 slides upward to reset, the heat transfer oil reaches the lower end of the movable ring 10 through the gap again. As the movable ring 10 slides, it squeezes the heat transfer oil between the sliding disc 8 and the movable ring 10, creating pressure on the heat transfer oil flowing to the lower end of the movable ring 10 and impacting the remaining heat transfer oil. By controlling the temperature to rise and fall repeatedly, the heat transfer oil is mixed, improving the uniformity of the temperature distribution of the heat transfer oil.

[0052] During the operation of the ball valve, the pressure value monitored by the oil sensor when the ball valve is fully open is marked as P1. When the rotating shaft 13 rotates, the valve core 2 rotates, causing the ball valve to fully open. At this time, the pressure value monitored by the oil pressure sensor 431 is recorded as P2, where P2 > P1. The process of the pressure value rising from P1 to P2 is linearly proportional to the rotation angle of the valve core 2. During the rotation of the valve core 2, the oil pressure sensor 431 monitors the pressure value change in real time and determines the rotation angle of the valve core 2 by the amount of change. Similarly, the oil pressure when the ball valve is fully open can be recorded as P1, and the pressure when it is fully open can be recorded as P2, with the same judgment method.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pneumatic shut-off ball valve, characterized in that, include: The valve body (1) has an internal cavity; The valve core (2) is rotatably disposed inside the valve body (1) and the valve core (2) has a channel in the middle, and a heat-conducting oil cavity (4) is formed between the valve body (1) and the valve core (2). Two sealing rings (3) are provided and symmetrically disposed inside the valve body (1), and the two sealing rings (3) slide against the two sides of the valve core (2) respectively. The two sealing rings (3) are fixedly provided with a hemispherical extended sealing gasket (31) on the side that is close to each other. The separating sealing gasket (34) has two symmetrically arranged in the middle of the inner walls on both sides of the valve body (1). The extended sealing gasket (31) and the separating sealing gasket (34) form a sealing structure that wraps the valve core (2). The separating sealing gasket (34) divides the heat-conducting oil cavity (4) into two parts. The oil guide pipe (41) is provided in two sets and is symmetrically fixed on the outside of the valve body (1). Each set of the oil guide pipe (41) includes two pipes, and both sets of oil guide pipe (41) are connected to the heat transfer oil cavity (4). The extension tube (42) is provided in two sets and is connected to two sets of oil guide tubes (41) respectively. A heat conduction tube (45) is fixed between the two extension tubes (42) in each set. A three-way valve (43) is fixedly provided in the middle of the two extension tubes (42) in each set. An oil pressure sensor (431) is fixedly provided in the middle of one of the three-way valves (43), and an oil injection valve (432) is provided in the middle of the other three-way valve (43). A rotating shaft (13) is inserted into the top of the valve core (2) and is rotatably connected to the valve body (1) in a sealed manner; It also includes: an annular groove (22), which has two and is respectively located at both ends of the valve core (2); The lip (32) has four parts and is fixed at both ends of the two extended sealing gaskets (31). The four lip (32) are all semi-circular structures and are located in the two annular grooves (22). The heat-conducting oil in the heat-conducting oil cavity (4) applies pressure to the lip (32) so that the lip (32) and the annular groove (22) mechanically engage, thereby ensuring the sealing effect of the valve core (2). When the lip (32), the extended sealing gasket (31) and the sealing ring (3) are worn, the pressure of the heat-conducting oil changes. The oil pressure sensor (431) detects the wear of the lip (32), the extended sealing gasket (31) and the sealing ring (3) by detecting the pressure change of the heat-conducting oil.

2. A pneumatic shut-off ball valve according to claim 1, characterized in that, Also includes: The deformation cavity (321) is located inside the lip (32). The top of the outer wall of the lip (32) is set as an inclined surface. The lip (32) is deformed along the deformation cavity (321) under the influence of the pressure of the heat transfer oil and fits tightly with the annular groove (22) to ensure the sealing effect when the valve core (2) rotates.

3. A pneumatic shut-off ball valve according to claim 1, characterized in that, Also includes: The splicing block (35) has two parts and is fixedly disposed in the middle of the two separating sealing gaskets (34). Both ends of the outer side wall of the extended sealing gasket (31) are provided with splicing grooves (33) that are adapted to the splicing block (35). The splicing grooves (33) and the splicing block (35) are used to ensure the seal between the extended sealing gasket (31) and the separating sealing gasket (34).

4. A pneumatic shut-off ball valve according to claim 1, characterized in that, Also includes: The heating cover (44) is fixedly installed on the outside of the valve body (1) and has a heat-conducting liquid inside. Both heat-conducting pipes (45) are fixedly installed inside the heating cover (44). The electric heating tube (46) is fixed inside the heating cover (44). The electric heating tube (46) heats the heat-conducting oil inside the heat-conducting tube (45) through the heat-conducting liquid, thereby controlling the temperature of the valve core (2) and preventing the material from solidifying.

5. A pneumatic shut-off ball valve according to claim 1, characterized in that, Also includes: A shaft hole (11) is provided through the middle of the top end of the valve body (1); A pneumatic actuator (14) is fixedly mounted on the top of the valve body (1) and its output end is fixedly connected to the top of the rotating shaft (13). The pneumatic actuator (14) is used to provide power to the rotating shaft (13) so that the valve core (2) rotates.

6. A pneumatic shut-off ball valve according to claim 5, characterized in that, Also includes: An annular sealing groove (21) is formed in the middle of the valve body (1) and is located in the middle section of the rotating shaft (13); An annular sealing gasket (12) is fixed inside the annular sealing groove (21) to enhance the relative sealing between the rotating shaft (13) and the valve body (1).

7. A pneumatic shut-off ball valve according to claim 1, characterized in that, Also includes: Connecting seat (6), which has two and is located at both ends of valve body (1); Two annular seats (61) are provided and fixedly disposed on one side of the two connecting seats (6) near the valve body (1). The two annular seats (61) are respectively installed inside the valve body (1) by threads. The two sealing rings (3) are respectively disposed inside the two annular seats (61).

8. A pneumatic shut-off ball valve according to claim 7, characterized in that, Also includes: Two connecting flanges (62) are provided and fixedly disposed on the side of the two connecting seats (6) away from the valve body (1). The connecting flanges (62) are used to connect the valve body (1) to the pipeline. An alarm (5) is fixed on the outside of the valve body (1) and electrically connected to the oil pressure sensor (431). The oil pressure sensor (431) detects the pressure change of the heat transfer oil to determine the wear of the lip (32), the extension gasket (31) and the sealing ring (3) and issues an alarm message through the alarm (5).

9. A pneumatic shut-off ball valve according to claim 1, characterized in that, Also includes: The fixed plate (7) is fixedly connected to the inside of the valve body (1) and placed in the heat transfer oil cavity (4). The lower end face of the fixed plate (7) is a wavy slope. The sliding disk (8) is slidably mounted on the outside of the rotating shaft (13), and its top surface is adapted to the bottom surface of the fixed disk (7); The movable ring (10) is slidably fitted on the outside of the rotating shaft (13) and its top abuts against the sliding disk (8). The movable ring (10) is placed inside the heat-conducting oil cavity (4). Temperature-sensitive elastic element (9) is fitted on the outside of the rotating shaft (13) and fixedly connected to the bottom of the movable ring (10) for pushing the sliding disk (8) to contact the fixed disk (7); The rotating shaft (13) is rotatably located in the middle of the shaft hole (11), and a plug (132) is fixedly connected to the bottom. The plug (132) is placed on the top of the valve core (2), and the temperature-sensitive elastic element (9) is fixedly connected to the plug (132).

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