A crank rocker ball valve pneumatic bidirectional explosion-proof valve

Abstract

The utility model discloses a kind of based on crank rocker ball valve pneumatic bidirectional explosion-proof valve, belong to fluid control and safety explosion-proof equipment technical field, including pipeline, explosion-proof box, temperature sensor, first transmission assembly, valve core subassembly and second transmission assembly, explosion-proof box inside rotationally connected with valve core subassembly valve core subassembly two ends pass out explosion-proof box. Pipeline is set in pairs, and is inserted in the both sides of explosion-proof box, and two pipelines are connected by valve core subassembly. First transmission assembly is installed on the outer wall of explosion-proof box, and first transmission assembly output end is connected with one end of valve core subassembly, and the other end of valve core subassembly is installed with second transmission assembly. Temperature sensor is set in pairs, respectively installed on the outer wall of pipeline, and temperature sensor is electrically connected with first transmission assembly. Sealing assembly is slidably connected between explosion-proof box and pipeline, and sealing assembly driving end is slidably connected with second transmission assembly. The problem that due to explosion-proof valve one-way design and insufficient sealing reliability is solved. With the function of effectively blocking bidirectional explosion.

Description

Technical Field

[0001] This utility model relates to the field of fluid control and explosion-proof safety equipment technology, specifically to a pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve. Background Technology

[0002] In industries such as chemical, coal mining, and oil and gas transportation, pipeline systems are commonly used to transport flammable and explosive media such as natural gas, coalbed methane, and chemical solvents. Due to the characteristics of the media or improper operation, leaks, overpressure, or localized explosions may occur within the pipeline, generating high-intensity shock waves and flames. These explosive effects can propagate bidirectionally along the pipeline, triggering a chain reaction of explosions, leading to serious casualties and property damage. Therefore, explosion-proof valves are widely used in pipeline systems as critical safety equipment to quickly shut off the flow path and prevent the explosion from spreading in the event of an explosion.

[0003] Currently, most existing explosion-proof valves adopt a unidirectional explosion-proof design, such as a one-way valve or butterfly valve structure, which can only effectively block the explosion impact in one direction. When the explosion comes from the opposite direction, the explosion-proof performance of such valves decreases significantly or even fails, failing to meet the safety requirements of bidirectional explosion risk scenarios. Furthermore, the transmission mechanisms of traditional explosion-proof valves often use direct pneumatic drive or gear transmission, which suffers from problems such as response lag and large transmission gaps, resulting in slow valve core opening and closing speeds and difficulty in quickly cutting off the flow path in the early stages of an explosion. Regarding sealing, the sealing components of existing explosion-proof valves are mostly unidirectional sealing structures, which are prone to sealing failure under bidirectional media pressure fluctuations. The explosion-proof joint surfaces do not fully consider the problem of increased gaps caused by media corrosion and long-term wear, causing the explosion-proof performance to degrade over time.

[0004] Therefore, how to provide a pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve to overcome the defects of the existing structure is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] Therefore, this utility model provides a pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve to solve the problem that the existing explosion-proof valves cannot effectively block bidirectional explosions and pose safety hazards due to their unidirectional design, delayed response, and insufficient sealing reliability.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve, comprising: An explosion-proof enclosure, with a valve core assembly rotatably connected inside, the valve core assembly extending out of the explosion-proof enclosure at both ends; Pipes are installed in pairs and inserted on both sides of the explosion-proof box, and the two pipes are connected through the valve core assembly; A first transmission assembly is installed on the outer wall of the explosion-proof box. The output end of the first transmission assembly is connected to one end of the valve core assembly, and a second transmission assembly is installed on the other end of the valve core assembly. Temperature sensors are arranged in pairs and installed on the outer wall of the pipe respectively. The temperature sensors are electrically connected to the first transmission assembly. A sealing assembly is slidably connected between the explosion-proof box and the pipeline, and the driving end of the sealing assembly is slidably connected to the second transmission assembly.

[0007] In one possible implementation, the explosion-proof enclosure includes: The explosion-proof enclosure has a connecting shaft interface through the front and rear walls, and a pipe interface through the left and right walls. Both connecting shaft interfaces are equipped with bushings. The sealing assembly and the pipe are inserted into the pipe interface, and both ends of the valve core assembly are inserted into the bushing; The top cover is detachably connected to the top of the explosion-proof enclosure; Support frames, arranged in pairs, are installed at the bottom of the explosion-proof enclosure; The connecting frame is installed on the outer wall of the explosion-proof enclosure at one end and on the outer wall of the first transmission assembly at the other end. The first slide rail is installed on the outer wall of the explosion-proof enclosure. The first slide rail and the second transmission assembly are located on the same side. The driving end of the sealing assembly is slidably connected to the first slide rail.

[0008] In one possible implementation, the valve core assembly includes: The valve core is hollow and spherical, and is installed inside the explosion-proof box. The valve core has a bidirectional flow channel, which is aligned with the channel of the pipeline. The connecting shaft is integrally formed with the valve core, and its two ends extend out of the explosion-proof box.

[0009] In one possible implementation, the first transmission component includes: A cylinder is installed on the outer wall of the explosion-proof enclosure, and the cylinder is electrically connected to the temperature sensor; One end of the rocker arm is rotatably connected to the output end of the cylinder. A crank is rotatably connected at one end to the other end of the rocker arm, and the other end of the crank is connected to the valve core assembly.

[0010] In one possible implementation, the second transmission assembly includes a reversing plate and a second slide rail. The second slide rail is shaped like a zigzag and is formed on the outer wall of the reversing plate on the side away from the explosion-proof box. The outer wall of the other side of the reversing plate is fixedly connected to the valve core assembly.

[0011] In one possible implementation, the sealing assembly includes: Sleeves are provided in pairs and are respectively sleeved on the outside of the two pipes; A sealing sleeve is installed on the outer wall of the sleeve close to the valve core assembly. A connecting rod is mounted on the outer wall of the sleeve at one end, and a slider is mounted on the other end of the connecting rod. The slider is slidably connected to the second slide rail.

[0012] This utility model has the following advantages: By combining the crank-rocker drive mechanism (the first transmission component) with the ball valve core, reliable bidirectional explosion-proof capability is achieved. Based on the symmetry of the ball valve structure, it can effectively block explosive impacts from any direction in the pipeline. The crank-rocker drive mechanism, linked to the sealing mechanism, is controlled by the Z-shaped of the second slide rail and the linear direction of the first slide rail. This ensures that the sealing sleeve actively tightens only at the final closing point during the valve core's movement, solving the problem of seal wear and improving sealing reliability and service life. Furthermore, the entire transmission mechanism has excellent sealing performance and strong dust and corrosion resistance, making it suitable for harsh working conditions such as chemical and mining industries. Ultimately, the integrated design of sensing, driving, transmission, and sealing constitutes a safety system that is responsive, reliable, and long-lasting. Attached Figure Description

[0013] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0014] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0015] Figure 1 A three-dimensional view of a pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve provided for this utility model; Figure 2 A cross-sectional view of a pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve provided by this utility model; Figure 3 A cross-sectional view of the explosion-proof box provided by this utility model; Figure 4A cross-sectional view of the valve core assembly provided by this utility model; Figure 5 A plan view of the temperature sensor, the first transmission assembly, and the valve core assembly provided for this utility model; Figure 6 A perspective view of the second transmission assembly and sealing assembly provided by this utility model; Figure 7 A perspective view of the sealing assembly provided by this utility model; Figure 8 A cross-sectional view of the sealing assembly provided by this utility model; Figure 9 A schematic diagram of the valve core in the open state provided by this utility model; Figure 10 A schematic diagram of the valve core rotation state provided by this utility model; Figure 11 A schematic diagram of the valve core in closed state provided by this utility model; In the diagram: 1. Pipe; 2. Explosion-proof box; 21. Explosion-proof box body; 22. Top cover; 23. Support frame; 24. Connecting frame; 25. First slide rail; 3. Temperature sensor; 4. First transmission assembly; 41. Cylinder; 42. Rocker arm; 43. Crank; 5. Valve core assembly; 51. Valve core; 52. Bidirectional flow channel; 53. Connecting shaft; 6. Second transmission assembly; 61. Reversing plate; 62. Second slide rail; 7. Sealing assembly; 71. Sleeve; 72. Sealing sleeve; 73. Connecting rod; 74. Slider. Detailed Implementation

[0016] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Please refer to Figures 1-11 The present invention discloses a pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve, as follows: Figure 1 and Figure 2 The explosion-proof enclosure includes a pipe 1, an explosion-proof box 2, temperature sensors 3, a first transmission assembly 4, a valve core assembly 5, and a second transmission assembly 6. The valve core assembly 5 is rotatably connected inside the explosion-proof box 2, with both ends extending out of the box. Pipes 1 are arranged in pairs, inserted on both sides of the explosion-proof box 2, and connected via the valve core assembly 5. The first transmission assembly 4 is mounted on the outer wall of the explosion-proof box 2, with its output end connected to one end of the valve core assembly 5, and the second transmission assembly 6 mounted on the other end of the valve core assembly 5. Temperature sensors 3 are arranged in pairs, each mounted on the outer wall of a pipe 1, and electrically connected to the first transmission assembly 4. A sealing assembly 7 is slidably connected between the explosion-proof box 2 and the pipe 1, with its driving end slidably connected to the second transmission assembly 6.

[0020] Pipeline 1 is the channel for transporting flammable and explosive media. Explosion-proof enclosure 2 provides a mounting base for all internal components.

[0021] Temperature sensor 3, as the system's sensing structure, monitors for temperature anomalies in the medium within the pipeline, providing a trigger signal for the explosion-proof structure of the device. Once a risk is detected, the signal is immediately transmitted to the first transmission component 4, which, upon receiving the signal, provides power and transmits the power to the valve core assembly 5.

[0022] The hollow spherical valve core assembly 5 has a bidirectional flow channel, ensuring smooth medium flow in the initial stage (when the valve core assembly 5 rotates 0 degrees), and completely cutting off the flow channel after rotating 90 degrees. Thanks to the structural symmetry of the ball valve itself, this valve core assembly 5 forms the basis for achieving bidirectional explosion-proof function. The rotation of the valve core assembly 5 is converted into a sealing action through the second transmission assembly 6.

[0023] The second transmission component 6 works synchronously with the valve core assembly 5. It engages with the slider of the sealing component 7, and under the limiting position of the second transmission component 6 (during the valve core assembly 5's triggering of the closing mechanism), drives the sealing component 7 to first disengage and then press against the valve core assembly 5. This design ensures that the sealing component 7 fits tightly against the spherical surface of the valve core assembly 5 when the valve core assembly 5 has stopped rotating. This avoids wear and increases the sealing performance between the pipe 1 and the valve core assembly 5.

[0024] In a specific embodiment, such as Figure 3 The explosion-proof enclosure 2 includes an explosion-proof enclosure body 21, a top cover 22, a support frame 23, a connecting frame 24, and a first slide rail 25. The explosion-proof enclosure body 21 has connecting shaft interfaces extending through its front and rear walls, and pipe interfaces extending through its left and right walls. Bushings are installed on both connecting shaft interfaces. The sealing assembly 7 and the pipe 1 are inserted into the pipe interfaces, and both ends of the valve core assembly 5 are inserted into the bushings. The top cover 22 is detachably connected to the top of the explosion-proof enclosure body 21. The support frames 23 are arranged in pairs and installed at the bottom of the explosion-proof enclosure body 21. One end of the connecting frame 24 is installed on the outer wall of the explosion-proof enclosure body 21, and the other end is installed on the outer wall of the first transmission assembly 4. The first slide rail 25 is installed on the outer wall of the explosion-proof enclosure body 21, and the first slide rail 25 and the second transmission assembly 6 are located on the same side. The driving end of the sealing assembly 7 is slidably connected to the first slide rail 25.

[0025] The explosion-proof enclosure 21 has connecting shaft interfaces (with bushings installed inside) at the front and rear, ensuring that the valve core assembly 5 can rotate smoothly inside. Pipe interfaces running through its left and right walls are used to connect to pipe 1. The enclosure itself is made of WCB cast steel (which has high strength and corrosion resistance). In the event of an explosion inside, its mechanical strength and the gaps between the joints isolate the flames and blast waves within the enclosure, preventing them from propagating to the external environment.

[0026] The top cover 22 is detachably connected to the top of the explosion-proof enclosure 21, serving as a convenient maintenance window. Through the top cover 22, operators can inspect, repair, and replace the spindle assembly 5 inside the enclosure, improving the maintainability of the equipment and ensuring its performance durability under long-term harsh operating conditions.

[0027] The support frame 23 is installed in pairs at the bottom of the explosion-proof enclosure 21 to securely install the device on the ground and absorb vibrations from the pipe 1 and the valve body.

[0028] One end of the connecting bracket 24 is fixed to the outer wall of the explosion-proof enclosure, and the other end is firmly installed with the cylinder 41. Its function is to ensure that the pneumatic actuator and the valve body are integrated, thereby transmitting the driving force generated by the first transmission component 4 during operation to the valve core component 5, avoiding transmission errors, response delays or mechanism jamming caused by loose connections.

[0029] The first slide rail 25 is a guide component. It is mounted on the outer wall of the explosion-proof enclosure and is located on the same side as the second transmission assembly 6. Its function is to provide a defined sliding track for the connecting rod 73 of the sealing assembly 7. It works in conjunction with the Z-shaped second slide rail 62: the first slide rail 25 specifies that the sealing assembly 7 can only move horizontally along the axial direction of the pipe 1, thereby converting the circular motion of the valve core 51 into the linear motion of the sealing sleeve 72.

[0030] In a specific embodiment, such as Figure 4 The valve core assembly 5 includes a valve core 51, a bidirectional flow channel 52, and a connecting shaft 53. The valve core 51 is a hollow sphere and is housed inside the explosion-proof enclosure 2. The valve core 51 has a bidirectional flow channel 52, which is aligned with the channel of the pipe 1. The connecting shaft 53 is integrally formed with the valve core 51 and extends out of the explosion-proof enclosure 2 at both ends.

[0031] The valve core 51 adopts a hollow spherical symmetrical structure. Due to the structural symmetry of the spherical valve, this valve can achieve a completely symmetrical bidirectional seal. This means that regardless of whether the explosive impact comes from upstream or downstream of pipeline 1, the spherical valve core 51 can provide a completely consistent blocking surface, ensuring that the explosion-proof effect has no directional difference. At the same time, the valve core 51 is made of corrosion-resistant materials such as 316L stainless steel and undergoes hard anodizing treatment, which improves its surface hardness, thereby giving it good wear resistance and corrosion resistance, enabling it to adapt to harsh working conditions such as chemical and coal mining, and ensuring long-term reliability.

[0032] The bidirectional flow channel 52 is a through-channel formed on both sides of the valve core 51. It is the path for the medium to flow normally. When the valve is in the open state (i.e., the valve core 51 is at 0°), the bidirectional flow channel 52 is completely aligned with the axis of the pipe 1, forming a smooth channel. Its symmetrical design ensures that the medium can pass through equally smoothly from both directions.

[0033] The connecting shaft 53 is integrally formed and firmly connected to the valve core 51, with both ends extending out of the explosion-proof housing 21, undertaking the functions of power transmission and support. First, it transmits the rotational force from the first transmission assembly 4 (crank-rocker mechanism) to the valve core 51, causing it to rotate. Second, it is supported on the explosion-proof housing 21 by bushings, forming a rotational support for the valve core 51. In addition, one end of it is fixedly connected to the second transmission assembly 6 (reversing plate 61), thereby synchronously transmitting the main drive motion to the second transmission assembly 6 and the sealing assembly 7.

[0034] In a specific embodiment, such as Figure 5 The first transmission assembly 4 includes a cylinder 41, a rocker arm 42, and a crank 43. The cylinder 41 is mounted on the outer wall of the explosion-proof box 2 and is electrically connected to the temperature sensor 3. One end of the rocker arm 42 is rotatably connected to the output end of the cylinder 41. One end of the crank 43 is rotatably connected to the other end of the rocker arm 42, and the other end of the crank 43 is connected to the valve core assembly 5.

[0035] Cylinder 41 is fixed on a bracket on the outside of the valve body, with a working pressure range of 0.4-0.8MPa. The actuator is equipped with a quick exhaust valve (exhaust port diameter ≥15mm) to quickly discharge compressed air from the cylinder, ensuring that the valve core opening and closing response time is less than or equal to 0.5 seconds. Simultaneously, the actuator is also equipped with a pressure control module (not shown in the figure), including a pressure sensor (accuracy ±0.02MPa) and a solenoid directional valve (response time ≤10ms). The pressure sensor is installed at both ends of the bidirectional flow channel of the valve body to monitor the medium pressure in real time. When the pressure exceeds a preset threshold (which can be set to 0.6-1.2MPa depending on the operating conditions), the solenoid directional valve quickly switches, controlling the pneumatic actuator to drive the valve core to close.

[0036] The rocker arm 42 is made of 45# steel and has been heat-treated, with a weight-reducing hole in the middle. One end of it is hinged to the piston rod of the cylinder 41, receiving its linear thrust. Its function is to convert the linear motion input from the cylinder 41 into an oscillating motion around its other hinge point. It serves as a bridge connecting linear drive and subsequent rotary conversion.

[0037] One end of the crank 43 is hinged to the free end of the rocker arm 42, and the other end is fixedly connected to the connecting shaft 53 that drives the valve core. Its core function is to convert the swing of the rocker arm 42 into the circular motion of the valve core 51.

[0038] In a specific embodiment, such as Figure 6 The second transmission assembly 6 includes a reversing plate 61 and a second slide rail 62. The second slide rail 62 is shaped like a zigzag and is located on the outer wall of the reversing plate 61 on the side away from the explosion-proof box 2. The outer wall of the other side of the reversing plate 61 is fixedly connected to the valve core assembly 5.

[0039] The function of the reversing plate 61 is to transmit driving force and change the direction of driving force. It is directly and fixedly connected to the connecting shaft 53 of the valve core assembly 5, so that any rotation angle of the valve core 51 can be synchronously reproduced by the reversing plate 61. Therefore, it becomes a motion bridge connecting the first transmission assembly 4 and the sealing assembly 7.

[0040] The second slide rail 62 is designed in a Z-shape with a certain arc profile and is located on the outer wall of the reversing plate 61. This slide rail with a specific shape is essentially a mechanical cam, which dictates that the slider 74 in the sealing assembly 7 must follow its defined motion trajectory.

[0041] When the reversing plate 61 rotates with the valve core 51, the second slide rail 62 drags the slider 74. Since the slider 74 is simultaneously limited by the horizontal position of the first slide rail 25, it cannot follow the reversing plate in a circular motion, and can only convert the wheel constraint of the second slide rail 62 into a horizontal linear displacement.

[0042] During the valve core opening process (the rotation process of valve core 51 from 0° to 90°), the slide rail drives the sealing sleeve 72 to move away from the valve core first, making room for the rotation of valve core 51, avoiding dry friction wear during the rotation process, and improving the service life of the seal.

[0043] In the final stage of the valve core closing process (the rotation process of valve core 51 from 90° to 0°), the slide rail drives the sealing sleeve 72 to press against the spherical surface of valve core 51 along the axial direction of pipe 1. When the sealing sleeve 72 presses against the spherical surface of valve core 51, a tight seal is achieved.

[0044] In a specific embodiment, such as Figures 6-8 The sealing assembly 7 includes a sleeve 71, a sealing sleeve 72, a connecting rod 73, and a slider 74. The sleeves 71 are arranged in pairs and are respectively fitted onto the outer sides of the two pipes 1. The sealing sleeve 72 is installed on the outer wall of the sleeve 71 on the side close to the valve core assembly 5. One end of the connecting rod 73 is installed on the outer wall of the sleeve 71, and the other end of the connecting rod 73 is equipped with a slider 74, which is slidably connected to the second slide rail 62.

[0045] The sleeves 71 are fitted in pairs on the outside of the pipe 1 and can slide axially on the pipe 1. Their function is to provide the sealing sleeve 72 with a coaxial moving path with the pipe 1, ensuring that the sealing action is always aligned, thereby ensuring a uniform distribution of sealing force.

[0046] The sealing sleeve 72 is fixedly installed on the side of the sleeve 71 close to the valve core 51. Its function is to press the sealing surface against the spherical surface of the valve core 51 when the valve core 51 is closed or open, forming a sealing barrier. The connecting rod 73 and the slider 74 are the force transmission bridge and motion conversion joint connecting the transmission system and the sealing action.

[0047] One end of the connecting rod 73 is fixed to the sleeve 71, and the other end is connected to the slider 74. As a connecting component, it converts the motion received by the slider 74 into linear motion through the cooperative operation of the first slide rail 25 and transmits it to the sleeve 71 and the sealing sleeve 72.

[0048] The slider 74 is simultaneously constrained by the Z-shaped slide rail of the second transmission assembly 6 and the first slide rail 25 on the explosion-proof box 2. This dual constraint relationship forces the slider 74 to convert the contour trajectory of the second slide rail 62 into the horizontal linear motion defined by the first slide rail 25.

[0049] The usage process of this utility model embodiment is as follows (e.g.) Figures 9-11 ): Normal circulation status, such as Figure 9 : Under safe operating conditions, cylinder 41 is in the position where the valve is fully open. At this time, the crank-rocker structure of the first transmission assembly 4 fixes the valve core 51 at the opening angle (rotation angle of 0°). The bidirectional flow channel 52 of the valve core assembly 5 is aligned with the axis of the pipeline 1, allowing the medium (such as natural gas, chemical solvents, etc.) to flow smoothly.

[0050] The reversing plate 61 of the second transmission assembly 6 is in the fully open position corresponding to the valve core 51, and the slider 74 on it is at the end of the Z-shaped section of the second slide rail 62. At the same time, the connecting rod 73 connecting the slider 74 keeps the sealing assembly 7 in a position that presses tightly against the valve core 51, increasing the sealing performance of the valve core 51 connection during transmission.

[0051] The process of abnormal signal detection and valve closure, such as Figures 9 to 11 The process: When the temperature of the medium inside pipe 1 rises sharply due to an explosion, the paired temperature sensors 3 detect the abnormal signal and immediately transmit the signal to the control system (not shown in the figure).

[0052] The control system then issues a command to drive the piston rod of cylinder 41 to respond quickly. Cylinder 41 drives rocker arm 42 to move, and rocker arm 42 drives crank 43 to rotate, thus converting the oscillation into circular motion. Crank 43 directly drives the connecting shaft 53 and the valve core 51 fixed thereto to rotate. This allows the valve core 51 to rotate 90 degrees in a very short time, causing its spherical surface to block the flow channel and complete the initial shut-off.

[0053] As the valve core 51 and connecting shaft 53 rotate, the second transmission assembly 6, fixed to the other end of the connecting shaft 53, operates synchronously, causing the reversing plate 61 to rotate accordingly. The second slide rail 62 on its surface then begins to drag the slider 74. Under the limitation of the first slide rail 25, the slider 74 converts the contour trajectory motion of the second slide rail 62 into horizontal linear motion, and pushes the sleeve 71 and sealing sleeve 72 through the connecting rod 73, so that the sealing structure opens and closes synchronously with the operation of the valve.

[0054] The specific movement trajectory is as follows: When the valve core 51 rotates at 0° (e.g.) Figure 9 The slider 74 is located at one end of the second slide rail 62, so that the sealing sleeve 72 just presses against the spherical surface of the valve core 51; When valve core 51 begins to rotate (e.g.) Figure 10 The slider 74 begins to move following the shape of the second slide rail 62. Due to the action of the first slide rail 25, the slider 74 is restricted to linear motion. It first follows the zigzag structure to climb up, and after reaching the highest point, it follows the zigzag structure to descend. This motion logic is transmitted to the sleeve 71 and the sealing sleeve 72, which are manifested as gradually opening first, opening to the maximum extent, and then gradually closing.

[0055] When the valve core 51 rotates at an angle of 90° (e.g.) Figure 11 The slider 74 is located at the other end of the second slide rail 62, so that the sealing sleeve 72 just presses against the spherical surface of the valve core 51.

[0056] At this point, the valve is completely closed. The explosion-proof enclosure 21 and its internal valve core 51, together with the externally actively compressed sealing sleeve 72, constitute a reliable safety barrier. Regardless of whether the explosion shock wave or flame comes from upstream or downstream, it can be effectively blocked on one side of the valve, achieving bidirectional explosion-proof and preventing further escalation of the accident.

[0057] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve, characterized in that, include: An explosion-proof box (2) has a valve core assembly (5) rotatably connected inside, with both ends of the valve core assembly (5) extending out of the explosion-proof box (2). Pipes (1) are installed in pairs and inserted on both sides of the explosion-proof box (2). The two pipes (1) are connected through the valve core assembly (5). The first transmission assembly (4) is installed on the outer wall of the explosion-proof box (2). The output end of the first transmission assembly (4) is connected to one end of the valve core assembly (5). The other end of the valve core assembly (5) is equipped with a second transmission assembly (6). Temperature sensors (3) are arranged in pairs and installed on the outer wall of the pipe (1). The temperature sensors (3) are electrically connected to the first transmission assembly (4). The sealing assembly (7) is slidably connected between the explosion-proof box (2) and the pipe (1), and the driving end of the sealing assembly (7) is slidably connected to the second transmission assembly (6).

2. The pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve as described in claim 1, characterized in that, The explosion-proof box (2) includes: The explosion-proof enclosure (21) has a connecting shaft interface through the front and rear walls and a pipe interface through the left and right walls. Both connecting shaft interfaces are equipped with bushings. The sealing assembly (7) and the pipe (1) are inserted into the pipe interface, and the two ends of the valve core assembly (5) are inserted into the bushing; The top cover (22) is detachably connected to the top of the explosion-proof enclosure (21); Support frames (23) are installed in pairs at the bottom of the explosion-proof enclosure (21); One end of the connecting frame (24) is installed on the outer wall of the explosion-proof enclosure (21), and the other end of the connecting frame (24) is installed on the outer wall of the first transmission assembly (4); The first slide rail (25) is installed on the outer wall of the explosion-proof enclosure (21). The first slide rail (25) and the second transmission assembly (6) are located on the same side. The driving end of the sealing assembly (7) is slidably connected to the first slide rail (25).

3. The pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve as described in claim 1, characterized in that, The valve core assembly (5) includes: The valve core (51) is hollow spherical and is installed inside the explosion-proof box (2). The valve core (51) has a bidirectional flow channel (52) which is aligned with the channel of the pipe (1). The connecting shaft (53) is integrally formed with the valve core (51) and extends through the explosion-proof box (2) at both ends.

4. The pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve as described in claim 1, characterized in that, The first transmission assembly (4) includes: A cylinder (41) is installed on the outer wall of the explosion-proof box (2), and the cylinder (41) is electrically connected to the temperature sensor (3); One end of the rocker arm (42) is rotatably connected to the output end of the cylinder (41); A crank (43) is rotatably connected at one end to the rocker arm (42), and the other end of the crank (43) is connected to the valve core assembly (5).

5. The pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve as described in claim 1, characterized in that, The second transmission assembly (6) includes a reversing plate (61) and a second slide rail (62). The second slide rail (62) is shaped like a zigzag and is located on the outer wall of the reversing plate (61) on the side away from the explosion-proof box (2). The outer wall of the other side of the reversing plate (61) is fixedly connected to the valve core assembly (5).

6. The pneumatic bidirectional explosion-proof valve based on a crank-rocker ball valve as described in claim 5, characterized in that, The sealing assembly (7) includes: Sleeves (71) are provided in pairs and are respectively sleeved on the outside of the two pipes (1); A sealing sleeve (72) is installed on the outer wall of the sleeve (71) close to the valve core assembly (5); One end of the connecting rod (73) is mounted on the outer wall of the sleeve (71), and the other end of the connecting rod (73) is mounted with a slider (74), which is slidably connected to the second slide rail (62).

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