Diesel engine overspeed protection device

Abstract

The utility model relates to valve door field, concretely relates to a diesel engine overspeed protection device, through setting up the valve plate as the inclined cylinder structure, its sealing surface along the inclined cylinder side surface and the inner wall of the ventilation circular pipe form surface contact, has improved the sealing reliability obviously. When medium pressure acts on the valve plate, the inclined plane structure will produce the wedge effect, will pressure conversion be the component force that pushes the valve plate close, realizes the self-tight type sealing, and the higher pressure is, the stronger sealing effect is. The valve plate compensates the wear and tear influence through the evenly distributed inclined plane contact surface, only when the valve plate wear and tear make the included angle alpha increase to 90 degrees above can fail. The valve plate of the application rotates in the ventilation circular pipe and can complete the opening and closing action, need not set up the operation space additionally, both keep the reliability of rigid connection, and through reducing the number of components and optimizing space layout realize the compact design of structure. Solve the sealing easy failure of existing air cut-off valve, the compensation ability is poor after sealing surface wear and tear, the problem of cumbersome structure and inconvenient operation.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a diesel engine overspeed protection device. Background Technology

[0002] In existing diesel engines, the most effective way to prevent overspeed accidents is to cut off the intake air using a shut-off valve to achieve a protective shutdown. Common shut-off valve types include ball valves and gate valves. While ball valves are easy to manufacture, they typically require the use of soft-seal components such as sealing rings. These soft seals have a short service life under harsh operating conditions and require frequent maintenance and replacement. Gate valves, which are hard-seal shut-off valves, are more resistant to high temperatures and wear than those using soft seals, but after frequent opening and closing, the sealing surface is prone to wear and gaps, leading to poor sealing and leakage. When the gate and seat of a gate valve wear, only minor compensation can usually be made at the bottom, or the entire valve needs to be replaced. Effective compensation by adjusting the contact state of the sealing surface is not easily achieved, and gate valves are relatively large, occupying a significant amount of installation space. Furthermore, the reset operation of many shut-off valves is complex, failing to balance the convenience of manual and electronic control.

[0003] Therefore, there is an urgent need for a device that can quickly and reliably cut off airflow, and has good sealing properties and a long service life to prevent diesel engine overspeed. Utility Model Content

[0004] To address the problems of existing air shut-off valves, such as easy seal failure, poor compensation ability after seal surface wear, bulky structure, and inconvenient operation.

[0005] This utility model provides a diesel engine overspeed protection device, including a valve body and a control component disposed on one side of the valve body. The valve body includes a valve seat, a valve plate, and a rotating shaft. The valve seat is provided with a vent pipe, and the valve plate is located in the vent pipe. The valve plate is used to seal the vent pipe. The valve plate is a slanted cylindrical structure with a certain thickness. The rotating shaft is rotatably mounted on the valve seat, and one end of the rotating shaft passes through the valve seat and is fixedly connected to the valve plate. The other end of the rotating shaft is connected to the control component. The control component is used to drive the rotating shaft to rotate, thereby driving the valve plate to move and realize the control of the opening and closing of the vent pipe. When sealed, the side of the valve plate and the inner wall of the vent pipe are tightly fitted, and the included angle α between the valve plate and the vent pipe is less than 90 degrees.

[0006] Preferably, the control component includes a housing, a circuit board disposed in the housing, an electromagnetic drive component, a transmission component, and a handle; the electromagnetic drive component includes an encapsulation shell, a coil disposed in the encapsulation shell, a moving iron core, and a spring, the coil and the circuit board are electrically connected, the coil surrounds the moving iron core, one end of the moving iron core is exposed outside the encapsulation shell, the other end of the moving iron core is connected to the transmission component, and the spring is used to reset the moving iron core; the transmission component is connected to the top end of the handle, the center of the handle is fixedly connected to the end of the rotating shaft away from the valve core, and the bottom end of the handle is exposed outside the housing.

[0007] Preferably, the circuit board is electrically connected to a communication interface, a speed sensor, a digital display, and a diesel engine speed monitoring and setting button.

[0008] Preferably, a pull ring is provided at the exposed end of the moving iron core.

[0009] Preferably, the transmission assembly includes a reset assembly and a transmission handle. The reset assembly is used to reset the rotating shaft and the handle. One end of the transmission handle is rotatably connected to the housing, and the other end of the transmission handle is hinged to the moving iron core. A locking block is provided at the end of the transmission handle near the moving iron core, and a locking groove is provided on the handle. The locking block can be locked in the locking groove.

[0010] Preferably, the reset assembly includes a torsion spring and a limiting cap. The limiting cap is fixedly connected to the end of the rotating shaft away from the valve plate. The torsion spring is sleeved on the limiting cap. One leg of the torsion spring is fixedly connected to the housing, and the other leg of the torsion spring is fixedly connected to the top of the handle.

[0011] Preferably, the housing is provided with a bearing seat, the bearing seat contains a bearing and a connecting shaft, one end of the connecting shaft is fixedly connected to the shaft of the bearing, and the other end of the connecting shaft is fixedly connected to the transmission handle.

[0012] Preferably, the transmission handle is provided with a limiting groove and a cotter pin on the side near the locking block. The side wall of the limiting groove is provided with a first connecting hole. One end of the moving iron core is provided with a second connecting hole that is axially aligned with the first connecting hole. The moving iron core is inserted into the limiting groove, and the cotter pin passes through the first connecting hole and the second connecting hole to connect the moving iron core and the transmission handle.

[0013] Preferably, a reinforcing plate is provided on one side of the valve plate.

[0014] Preferably, when sealed, the included angle α between the valve plate and the vent pipe is greater than or equal to 30 degrees and less than 90 degrees.

[0015] The beneficial effects of this invention are reflected in the fact that by setting the valve plate as an inclined cylindrical structure, its sealing surface forms a surface contact with the inner wall of the vent pipe along the side of the inclined cylinder. Compared with the planar sealing method of traditional flat gate valves, this significantly improves the sealing reliability. Different gas media flow through the vent pipe, and the valve plate is used to block the gas media. When the medium pressure acts on the valve plate, the inclined structure generates a wedge effect, converting the pressure into a component force that pushes the valve plate to fit tightly, achieving a self-tightening seal. The higher the pressure, the stronger the sealing effect. Compared with the problem of gap leakage caused by pressure fluctuations or wear in traditional planar seals, the valve plate compensates for the wear effect through a uniformly distributed inclined contact surface. It will only fail when the wear of the valve plate increases the included angle α to more than 90 degrees. Compared with traditional gate valves, the valve plate of this application can complete the opening and closing action by rotating within the vent pipe, without the need for additional operating space. This maintains the reliability of the rigid connection and achieves a compact design by reducing the number of components and optimizing the spatial layout. This invention addresses the problems of existing gas shut-off valves, such as easy seal failure, poor compensation ability after wear of the sealing surface, bulky structure, and inconvenient operation. Attached Figure Description

[0016] Figure 1 This is a perspective view of the diesel engine overspeed protection device provided by this utility model.

[0017] Figure 2 for Figure 1 Exploded view.

[0018] Figure 3 This is a cross-sectional view of the control component provided by this utility model.

[0019] Figure 4 A cross-sectional view of the valve body when the diesel engine overspeed protection device is sealed.

[0020] Figure 5 This is a cross-sectional view of the valve body when the diesel engine overspeed protection device is activated.

[0021] In the diagram: 1-Valve body; 11-Valve seat; 111-Ventilation pipe; 12-Valve plate; 121-Reinforcing plate; 13-Shaft; 2-Control assembly; 21-Housing; 211-Bearing seat; 212-Bearing; 213-Connecting shaft; 22-Circuit board; 221-Charging port; 222-Digital display; 223-Button; 23-Electromagnetic drive assembly; 231-Encapsulation shell; 232-Moving iron core; 232a-Pull ring; 232b-Second connecting hole; 24-Transmission assembly; 241-Reset assembly; 241a-Torsion spring; 241b-Limit cap; 242-Transmission handle; 242a-Clocking block; 242b-Limiting groove; 242c-Cotter pin; 242d-First connecting hole; 25-Handle; 251-Clocking groove; 3-Connecting seat. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Reference Figures 1-5 A diesel engine overspeed protection device includes a valve body 1 and a control component 2 disposed on one side of the valve body 1. The valve body 1 includes a valve seat 11, a valve plate 12, and a rotating shaft 13. The valve seat 11 is provided with a vent pipe 111, and the valve plate 12 is located in the vent pipe 111. The valve plate 12 is used to seal the vent pipe 111. The valve plate 12 is a slanted cylindrical structure with a certain thickness. The rotating shaft 13 is rotatably mounted on the valve seat 11, and one end of the rotating shaft 13 passes through the valve seat 11 and is fixedly connected to the valve plate 12. The other end of the rotating shaft 13 is connected to the control component 2. The control component 2 is used to drive the rotating shaft 13 to rotate, thereby driving the valve plate 12 to move and realize the control of the opening and closing of the vent pipe. When sealed, the side of the valve plate 12 and the inner wall of the vent pipe 111 are tightly fitted, and the included angle α between the valve plate 12 and the vent pipe 111 is less than 90 degrees.

[0024] By designing the valve plate 12 as an oblique cylindrical structure, its sealing surface forms a surface contact with the inner wall of the vent pipe 111 along the oblique cylindrical side. Compared with the planar sealing method of traditional flat gate valves, this significantly improves the sealing reliability. Different gas media flow through the vent pipe 111, and the valve plate 12 is used to block the gas media. When the medium pressure acts on the valve plate 12, the oblique structure generates a wedge effect, converting the pressure into a component force that pushes the valve plate 12 to fit tightly, achieving a self-tightening seal. The higher the pressure, the stronger the sealing effect. Compared with the problem of gap leakage caused by pressure fluctuations or wear in traditional planar seals, the valve plate 12 compensates for the wear effect through a uniformly distributed oblique contact surface. It will only fail when the wear of the valve plate 12 increases the included angle α to more than 90 degrees. Compared with traditional gate valves, the valve plate 12 of this application can complete the opening and closing action by rotating within the vent pipe 111, without the need for additional operating space. This maintains the reliability of the rigid connection and achieves a compact design by reducing the number of components and optimizing the spatial layout. This invention addresses the problems of existing gas shut-off valves, such as easy seal failure, poor compensation ability after wear of the sealing surface, bulky structure, and inconvenient operation.

[0025] Reference Figures 2-3In some embodiments, the control component 2 includes a housing 21, a circuit board 22 disposed on the housing 21, an electromagnetic drive component 23, a transmission component 24, and a handle 25; the electromagnetic drive component 23 includes an encapsulation shell 231, a coil disposed on the encapsulation shell 231, a moving iron core 232, and a spring, the coil and the circuit board 22 are electrically connected, the coil surrounds the moving iron core 232, one end of the moving iron core 232 is exposed outside the encapsulation shell 231, the other end of the moving iron core 232 is connected to the transmission component 24, and the spring is used to reset the moving iron core 232; the transmission component 24 is connected to the top end of the handle 25, the center of the handle 25 is fixedly connected to the end of the rotating shaft 13 away from the valve core, and the bottom end of the handle 25 is exposed outside the housing 21.

[0026] By setting up the electromagnetic drive component 23, remote automated control can be achieved. When automatic shut-off is required, the circuit board 22 is electrically connected to the external control component 2, such as a PLC, to precisely control the coil to generate a magnetic field, driving the moving iron core 232 to move. The linear motion is converted into rotational motion by the transmission component 24, which drives the valve plate 12 to complete the sealing action. By setting up the handle 25, the operator can perform manual operation in the event of a power failure, ensuring both the convenience of automated control and providing a reliable emergency operation method. The transmission component 24 connects the electromagnetic drive, handle 25, and rotating shaft 13 together, enabling the three to work together. This ensures both the accuracy of electromagnetic control and the reliability of manual operation, allowing the valve to work safely and reliably under various working conditions. A spring surrounds the moving iron core 232. Specifically, one end of the spring is connected to the encapsulation shell 231, and the other end is connected to the moving iron core 232. Under normal conditions, the coil needs to be continuously energized to overcome the force of the spring, keeping the moving iron core 232 in the open position, thus opening the valve. Once the power is cut off or the control circuit issues an alarm signal, the coil immediately loses power and the magnetic field disappears. At this time, the compressed spring will release its elastic force instantly, pushing the moving iron core 232 to reset. This action ultimately drives the valve to the closed state through the transmission component 24.

[0027] A connecting seat 3 is added between the valve seat 11 and the housing 21. On the one hand, it makes the connection between the valve seat 11 and the housing 21 more secure and tight. On the other hand, it effectively blocks the temperature fluctuation of the fluid medium in the valve seat 11 and the vibration of the pipeline from being transmitted to the housing 21. In addition, the connecting seat 3 provides a high-precision support path for the rotating shaft 13 through the valve seat 11, the connecting seat 3 and the housing 21, ensuring the accuracy and smoothness of power transmission.

[0028] Reference Figure 2 Preferably, the circuit board 22 is electrically connected to a communication interface 221, a speed sensor, a digital display 222, and a diesel engine speed monitoring and setting button 223.

[0029] By setting up communication interface 221, remote monitoring of device operation data and retrieval of historical fault records are realized, providing data support for equipment condition monitoring and predictive maintenance. The real-time speed of the diesel engine is detected by a speed sensor. Human-machine interaction is achieved through a digital display 222 and a diesel engine speed monitoring setting button 223. Specifically, the real-time speed of the diesel engine is detected by the speed sensor, and the digital display 222 displays overspeed status indication and the current diesel engine speed, ensuring rapid identification and diagnosis of the fault cause after a protection action. The diesel engine speed monitoring setting button 223 allows for local modification of parameters, ensuring safe equipment operation.

[0030] Reference Figure 2 Preferably, the exposed end of the moving iron core 232 is provided with a pull ring 232a. This makes it convenient for the operator to pull the moving iron core 232.

[0031] Reference Figure 2 Preferably, the transmission assembly 24 includes a reset assembly 241 and a transmission handle 242. The reset assembly 241 is used to reset the rotating shaft 13 and the handle 25. One end of the transmission handle 242 is rotatably connected to the housing 21, and the other end of the transmission handle 242 is hinged to the moving iron core 232. A locking block 242a is provided at the end of the transmission handle 242 near the moving iron core 232, and a locking groove 251 is provided on the handle 25. The locking block 242a can be locked in the locking groove 251.

[0032] When the moving iron core 232 moves downward, it pulls the transmission handle 242, causing it to rotate around the end hinged to the housing 21, thereby disengaging the locking block 242a from the slot 251 of the handle 25. The rotating shaft 13 then rotates automatically under the action of the reset assembly 241, causing the valve plate 12 to close and cutting off the airflow. Simultaneously, the rotation of the shaft 13 forces the handle 25 to rotate as well, causing the end of the handle 25 exposed outside the housing 21 to tilt upward. To manually open the valve, simply pull the tilted handle 25 downward. The downward rotation of the handle 25 around the shaft 13 gradually presses down on the transmission handle 242 until the locking block 242a on the transmission handle 242 is pressed back into the slot 251 of the handle 25, achieving engagement and locking. At the same time, the transmission handle 242 also pushes the moving iron core 232 back to its initial position, preparing for the next electric operation.

[0033] Reference Figure 2 More preferably, the reset assembly 241 includes a torsion spring 241a and a limiting cap 241b. The limiting cap 241b is fixedly connected to the end of the rotating shaft 13 away from the valve plate 12. The torsion spring 241a is sleeved on the limiting cap 241b. One leg of the torsion spring 241a is fixedly connected to the housing 21, and the other leg of the torsion spring 241a is fixedly connected to the top of the handle 25.

[0034] The torsion spring 241a continuously provides the reset torque for the rotating shaft 13 to drive the valve plate 12 to close. The torsion spring 241a ensures that the position of the handle 25 can accurately reflect the state of the internal valve plate 12 through its connection with the handle 25. At the same time, the limit cap 241b fixed to the rotating shaft 13 serves as the mounting base for the torsion spring 241a, together ensuring that the rotating shaft 13 can reliably and accurately reset the valve plate 12.

[0035] Reference Figure 2 In a further preferred embodiment, the housing 21 is provided with a bearing seat 211, the bearing seat 211 is provided with a bearing 212 and a connecting shaft 213, one end of the connecting shaft 213 is fixedly connected to the axis of the bearing 212, and the other end of the connecting shaft 213 is fixedly connected to the transmission handle 242.

[0036] The arrangement of bearing housing 211, bearing 212 and connecting shaft 213 provides a low-friction, high-precision, long-life and easy-to-maintain rotational fulcrum for transmission handle 242.

[0037] Reference Figures 2-3 In a further preferred embodiment, the transmission handle 242 is provided with a limiting groove 242b and a cotter pin 242c on the side near the locking block 242a. The side wall of the limiting groove 242b is provided with a first connecting hole. One end of the moving iron core 232 is provided with a second connecting hole 232b that is axially aligned with the first connecting hole. The moving iron core 232 is inserted into the limiting groove 242b. The cotter pin 242c passes through the first connecting hole and the second connecting hole 232b to connect the moving iron core 232 and the transmission handle 242.

[0038] One end of the cotter pin 242c is a circular pull ring 232a. The other end of the cotter pin 242c is bent to form a locking structure after passing through the first connecting hole and the second connecting hole 232b, to prevent the connection from becoming loose. Since the moving iron core 232 moves linearly, while the transmission handle 242 oscillates around its axis, the relative position between the moving iron core 232 and the transmission handle 242 will change slightly during the movement. Inserting the moving iron core 232 into the limiting groove 242b and forming a hinge with the cotter pin 242c can automatically adapt to and compensate for minor dimensional errors and deformations generated during manufacturing and assembly, ensuring smooth movement and avoiding jamming or additional wear caused by rigid connections.

[0039] Reference Figure 5 In some embodiments, a reinforcing plate 121 is provided on one side of the valve plate 12.

[0040] By setting the reinforcing plate 121, the strength of the valve plate 12 is improved, preventing it from deforming under pressure. It also provides a larger connection area for the shaft 13, making the connection between the shaft 13 and the valve plate 12 more robust and reliable, enabling the transmission of greater torque and further preventing failures caused by connection point failure.

[0041] The thickness of the reinforcing plate 121 is greater than the thickness of the valve plate 12. The reinforcing plate 121 has a frustum structure. The larger end face of the reinforcing plate 121 is fixedly connected to the valve plate 12. The larger end face area of ​​the reinforcing plate 121 is smaller than the end face area of ​​the valve plate 12.

[0042] Reference Figure 4 In some embodiments, when sealed, the included angle α between the valve plate 12 and the vent pipe 111 is greater than or equal to 30 degrees and less than 90 degrees.

[0043] If the included angle α is too small, the frictional torque that the valve plate 12 needs to overcome when closing and opening increases, making operation very laborious and placing a huge burden on the electromagnetic drive assembly 23 or the manual operator. It also exacerbates the wear of the sealing surface. Limiting the included angle α to greater than or equal to 30 degrees and less than 90 degrees ensures that the valve has reliable self-tightening sealing performance and good wear compensation capability, while also taking into account ease of operation and the service life of the sealing surface. This avoids the problems of difficult operation due to an excessively small angle or sealing failure due to an excessively large angle.

[0044] In the description of the embodiments of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "center," "top," "bottom," "top," "bottom," "inner," "outer," "inner side," and "outer side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. "Inner side" refers to the interior or enclosed area or space. "Outer perimeter" refers to the area surrounding a specific component or specific area.

[0045] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention. It will be clearly understood by those skilled in the art that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A diesel engine overspeed protection device, comprising a valve body and a control component disposed on one side of the valve body, the valve body comprising a valve seat, a valve plate and a rotating shaft, the valve seat having a vent pipe, the valve plate being located within the vent pipe, the valve plate being used to seal the vent pipe, characterized in that: The valve plate is a slanted cylindrical structure with a certain thickness. The rotating shaft is rotatably mounted on the valve seat, and one end of the rotating shaft passes through the valve seat and is fixedly connected to the valve plate. The other end of the rotating shaft is connected to the control component. The control component is used to drive the rotating shaft to rotate, thereby moving the valve plate and controlling the opening and closing of the vent pipe. When sealed, the side of the valve plate and the inner wall of the vent pipe are tightly fitted, and the included angle α between the valve plate and the vent pipe is less than 90 degrees.

2. The diesel engine overspeed protection device according to claim 1, characterized in that: The control assembly includes a housing, a circuit board disposed on the housing, an electromagnetic drive assembly, a transmission assembly, and a handle; the electromagnetic drive assembly includes an encapsulation shell, a coil disposed on the encapsulation shell, a moving iron core, and a spring, the coil and the circuit board are electrically connected, the coil surrounds the moving iron core, one end of the moving iron core is exposed outside the encapsulation shell, the other end of the moving iron core is connected to the transmission assembly, and the spring is used to reset the moving iron core; the transmission assembly is connected to the top of the handle, the center of the handle is fixedly connected to the end of the rotating shaft away from the valve core, and the bottom end of the handle is exposed outside the housing.

3. The diesel engine overspeed protection device according to claim 2, characterized in that: The circuit board is electrically connected to a communication interface, a speed sensor, a digital display, and a diesel engine speed monitoring and setting button.

4. A diesel engine overspeed protection device according to claim 2, characterized in that: The exposed end of the moving iron core is provided with a pull ring.

5. A diesel engine overspeed protection device according to claim 2, characterized in that: The transmission assembly includes a reset assembly and a transmission handle. The reset assembly is used to reset the rotating shaft and the handle. One end of the transmission handle is rotatably connected to the housing, and the other end of the transmission handle is hinged to the moving iron core. A locking block is provided at the end of the transmission handle near the moving iron core, and a locking groove is provided on the handle. The locking block can be locked in the locking groove.

6. A diesel engine overspeed protection device according to claim 5, characterized in that: The reset assembly includes a torsion spring and a limiting cap. The limiting cap is fixedly connected to the end of the rotating shaft away from the valve plate. The torsion spring is sleeved on the limiting cap. One leg of the torsion spring is fixedly connected to the housing, and the other leg of the torsion spring is fixedly connected to the top of the handle.

7. A diesel engine overspeed protection device according to claim 5, characterized in that: The housing is provided with a bearing seat, the bearing seat contains a bearing and a connecting shaft, one end of the connecting shaft is fixedly connected to the axis of the bearing, and the other end of the connecting shaft is fixedly connected to the transmission handle.

8. A diesel engine overspeed protection device according to claim 5 or 7, characterized in that: The transmission handle is provided with a limiting groove and a cotter pin on the side near the locking block. The side wall of the limiting groove is provided with a first connecting hole. One end of the moving iron core is provided with a second connecting hole that is axially aligned with the first connecting hole. The moving iron core is inserted into the limiting groove, and the cotter pin passes through the first connecting hole and the second connecting hole to connect the moving iron core and the transmission handle.

9. A diesel engine overspeed protection device according to claim 1, characterized in that: A reinforcing plate is provided on one side of the valve plate.

10. A diesel engine overspeed protection device according to claim 1, characterized in that: When sealed, the included angle α between the valve plate and the vent pipe is greater than or equal to 30 degrees and less than 90 degrees.

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