Mechanical driver for kitchen equipment fire extinguishing device

Abstract

The utility model belongs to the technical field of kitchen fire extinguishing, and discloses a mechanical driver for a kitchen equipment fire extinguishing device, which comprises a valve cover, a valve body, a shaft rod, a spring, a piston, a pricking needle rod, a cushion, a hook starting rod, a torsion spring 1, a torsion spring 2, a rotating shaft rod, a hook plate, a starting plate, an emergency starting pull ring and a reset-safety wrench. The connecting end of the valve body and the driving gas cylinder is provided with two outlets, one end is provided with a pressure reducing valve when a kitchen equipment fire extinguishing device is assembled, and the other end is connected to a water flow valve through a copper pipe to drive a fire extinguishing agent to extinguish fire; two threaded holes are formed in the upper end of the valve body and are used for fixing the microswitch; the microswitch is used for transmitting a signal to a central control room and an exhaust system when the device is started; the terminal of the microswitch is lapped on the hook plate, when the hook plate is started, the terminal is driven to move, and the microswitch is started; square holes are milled in the cylindrical surface of the pricking needle part of the pricking needle rod so as to enlarge the flow area of driving gas.

Description

Technical Field

[0001] This utility model belongs to the field of kitchen fire extinguishing technology, and in particular relates to a mechanical actuator for a kitchen equipment fire extinguishing device. Background Technology

[0002] With the improvement of people's living standards, kitchen fires are becoming more and more frequent. The use of gas for cooking, the use of cooking oil, and the accumulation of grease over time can all lead to fires if there are any errors, improper operations, or poor management during the process. Therefore, efficient kitchen fire extinguishing devices are becoming increasingly common.

[0003] Kitchen equipment fire extinguishing systems are specialized fire suppression systems designed specifically for kitchen equipment, fume hoods, and exhaust ducts. When a fire occurs in the kitchen equipment operating area, the extinguishing agent is evenly sprayed into the ventilation ducts, kitchenware surfaces, and exhaust ducts at a controlled flow rate and pressure. When the extinguishing agent is atomized through the nozzle and sprayed onto the fire area, a chemical reaction occurs, generating a foam layer that isolates grease from air and rapidly reduces the temperature of the fire area, achieving the desired extinguishing effect.

[0004] Currently, most fire extinguishing devices in kitchens are driven by electromagnetic actuators. However, the humid and high-temperature environment of a kitchen can corrode electronic components and cause wiring to age prematurely. In the event of a fire, this can prevent the extinguishing system from activating, resulting in significant property damage. While mechanical actuators are also used, they have many drawbacks, such as overly complex structures, complicated reset levers, or the lack of safety pins, making them difficult to manufacture and maintain.

[0005] Based on the above analysis, the problems and shortcomings of the existing technology are as follows:

[0006] 1. Existing mechanical actuators are mostly cast, resulting in overly complex structures. The actuators consist of a locking mechanism and a driving mechanism, leading to a large overall size that occupies significant space within the device housing. Furthermore, the locking mechanism is unstable and prone to false starts. Assembly and debugging are also difficult, resulting in high processing and assembly costs.

[0007] 2. The reset wrench of the mechanical actuator is too complicated and large, making it inconvenient to put into the device housing. In addition, the surface of the actuator needs to be reserved for the reset wrench to reset, and the force required for reset is relatively large, making it inconvenient to operate and adding a lot of difficulty to the subsequent installation.

[0008] 3. The lack of a safety pin makes it easy to misoperate and cause the device to start incorrectly.

[0009] 4. Low propellant gas flow rate results in slow propellant speed, insufficient follow-up force, unstable flow rate, and excessively long discharge time. After the extinguishing agent is discharged, too much propellant gas remains, causing the propellant gas to continue to be sprayed after extinguishing the fire. This draws air into the extinguishing area, replenishing the oxygen needed for reignition, which can easily lead to reignition.

[0010] 5. In the prior art, the needle of the mechanical actuator is locked by the locking tongue in the locking structure to prevent the needle from starting under the force of the compression spring. Since the contact area of ​​the locking tongue is very small, even a slight shaking may cause the needle to start, so the reliability is poor. Utility Model Content

[0011] To address the problems existing in the prior art, this utility model provides a mechanical actuator for a fire extinguishing device for kitchen equipment.

[0012] This utility model is implemented as follows: a mechanical actuator for a kitchen equipment fire extinguishing device, comprising a valve cover, valve body, shaft, spring, piston, needle rod, buffer pad, hook starting rod, torsion spring, rotating shaft, hook plate, starting plate, reset-safety wrench, and emergency start pull ring;

[0013] The valve body is connected to the driving gas cylinder at two outlets. One end is equipped with a pressure reducing valve when assembling the kitchen equipment fire extinguishing device, and the other end is connected to the water flow valve through a copper pipe to drive the fire extinguishing agent to extinguish the fire.

[0014] There are two threaded holes at the upper end of the valve body for fixing the micro switch. The function of the micro switch is to transmit a signal to the central control room and the ventilation system when the device is turned on. The terminals of the micro switch are attached to the hook plate. When the hook plate is activated, it will move the terminals and turn on the micro switch.

[0015] A square hole is milled into the cylindrical surface of the needle rod to increase the flow area of ​​the driving gas.

[0016] Connect the shaft and the needle rod to the piston via threads and tighten them. Then, apply lubricating silicone grease to both O-rings and insert them into the corresponding grooves of the needle rod. Install the buffer pad into the valve body, and place the assembled shaft, piston, and needle rod assembly into the valve body, ensuring it is tightly against the buffer pad. Adjust the piston hole position and insert the hook actuating rod into the corresponding holes of the valve body and piston. Then, place the spring on the shaft, insert it, and ensure it is tightly against the end face of the piston. Place the valve cover on the shaft, press it against the spring, and screw it into the threaded part of the valve body, then tighten it.

[0017] Secure the two torsion springs, hook plate, and starter plate to both ends of the valve body via the rotating shaft. Fix the torsion spring rings to both ends of the valve body with two hexagonal head bolts, and hook the other end of the torsion spring onto the two vertical surfaces of the hook plate. Secure the micro switch and micro-opening washer to the valve body with screws, ensuring that the terminals of the micro switch rest on the vertical surface of the hook plate. Insert the reset / safety wrench into the hole in the shaft to prevent loss.

[0018] Further, the workflow is as follows: Insert the reset end of the reset-safety wrench into the first hole of the shaft, also known as the reset hole. Pull up the shaft, piston, and needle rod using the reset-safety wrench. The spring is compressed in the space between the valve cover and the piston, causing the hook actuating rod to lift. Under the elastic force of the torsion spring, the hook plate moves towards the hook actuating rod and locks it, putting the mechanical actuator into operation. When the kitchen equipment fire extinguishing device is not activated, insert the safety end of the reset-safety wrench into the second hole of the shaft, also known as the safety hole. This hole is only visible after the reset hole is pulled up. This structure serves as a safety pin to prevent accidental activation when the device is not in use. To avoid causing losses to customers, the temperature-sensitive fusible release mechanism is connected to the corresponding holes on the starter plate via steel wire ropes and spring wrenches via springs. The manual starter box is connected to the corresponding holes on the hook plate via steel wire ropes. When the kitchen equipment fire extinguishing device is in the activated state, pull out the reset-safety wrench to open the mechanical actuator automatically or manually. In automatic mode, the temperature-sensitive fusible release mechanism is released, and the starter plate moves in the opposite direction of the hook starter rod under the pulling force of the spring wrench. When the hook starter rod leaves the hook groove of the hook plate, the coaxial rod, piston, and piercing rod of the starter rod are ejected downwards under the elastic force of the spring, thereby puncturing the drive gas cylinder to extinguish the fire.

[0019] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this utility model are as follows:

[0020] First, this utility model integrates the locking mechanism and the driving mechanism together, which reduces the difficulty of processing, reduces the failure rate during use, reduces production and processing costs, is easy to process, easy to assemble and debug, and has higher stability.

[0021] This invention combines the driving mechanism and the locking mechanism, making the structure more compact and reasonable. The contact area between the hook starter rod and the hook plate is larger, and the working stability of the driver is greatly improved.

[0022] Third, the expected benefits and commercial value of the technical solution of this utility model after its transformation are as follows: First, in the original technology, the mechanical drive is very unstable. In order to adjust the stability, it is usually necessary to repeatedly adjust the locking tongue in the locking mechanism, which increases labor costs. Second, the structure is cast, which requires outsourcing processing, and the working time cannot be well controlled. Moreover, there are many internal parts, resulting in high processing costs. The improvement of this utility model patent technology not only reduces processing time but also optimizes the internal structure. The processing method is simple, and it can be processed using only a lathe, eliminating the need for outsourcing casting. This greatly reduces processing and labor costs, increases product profits, and will also receive widespread praise from users, increasing orders for future sales.

[0023] Fourth, the significant technological advancements brought about by the mechanical actuator for the kitchen equipment fire extinguishing device provided by this utility model mainly include the following aspects:

[0024] 1. High fire extinguishing efficiency: The device uses a mechanical actuator to start quickly, which can puncture the driving gas cylinder and release the extinguishing agent, effectively extinguishing kitchen fires and improving fire extinguishing efficiency.

[0025] 2. Signal transmission function: The micro switch in this device can transmit signals to the central control room, ventilation system, etc. when the device is turned on, which facilitates remote monitoring and control.

[0026] 3. Safe and reliable: The reset-safety wrench in this device can prevent accidental operation when it is not in use, and the design of the emergency start pull ring also increases the safety of use.

[0027] 4. Easy to install and maintain: The device has a simple structure, is easy to install and maintain, and can quickly restore the normal operation of kitchen equipment.

[0028] 5. Low cost: The device uses a mechanical drive, which is more cost-effective and economical than traditional electrical control methods.

[0029] The mechanical actuator for the fire extinguishing device of kitchen equipment provided by this utility model represents a significant technological advancement and provides strong protection for the safe use of kitchen equipment. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a front view of the mechanical actuator for the fire extinguishing device of kitchen equipment provided in this embodiment of the utility model;

[0032] Figure 2 This is a side view of the mechanical actuator for the fire extinguishing device of kitchen equipment provided in this embodiment of the utility model;

[0033] Figure 3 This is a schematic diagram of the working state of the mechanical actuator for the fire extinguishing device of kitchen equipment provided in this embodiment of the utility model;

[0034] Figure 4 This is a schematic diagram of the mechanical actuator for the fire extinguishing device of kitchen equipment in the open state provided in this embodiment of the utility model;

[0035] Figure 5 This is a structural diagram of an old mechanical drive based on existing technology. 。

[0036] In the diagram: 1. Valve cover; 2. Valve body; 3. Shaft; 4. Spring; 5. Piston; 6. Needle rod; 7. Buffer pad; 8. Hook actuating rod; 9. Torsion spring ① 10. Torsion spring ② ; 11. Rotating shaft; 12. Hook plate; 13. Starter plate; 14. Emergency start pull ring; 15. Reset-safety wrench; 201. Hex head bolt; 202. Micro switch; 203. Micro-opening washer; 204. Screw; 601. O-ring; 602. O-ring. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0038] To address the problems existing in the prior art, this utility model provides a mechanical actuator for a fire extinguishing device for kitchen equipment. The utility model will be described in detail below with reference to the accompanying drawings.

[0039] The working principle of the kitchen equipment fire extinguishing device provided by this utility model is as follows: the tensioning steel wire rope of the temperature-sensitive fusible release mechanism is connected to the temperature-sensitive start lever of the mechanical actuator; the hand-operated start box is connected to the manual start lever of the mechanical actuator via a steel wire rope; the driving gas cylinder is connected to the mechanical actuator via a container valve; the mechanical actuator has two outlets, one of which is equipped with a pressure reducing valve connected to the fire extinguishing agent cylinder via a hose; the other outlet is a high-pressure output connected to a water flow valve via a copper pipe. In the event of a fire, the temperature-sensitive fusible release mechanism releases the mechanical actuator via the temperature-sensitive start lever, or by pulling the hand-operated start box. The piercing needle inside the mechanical actuator punctures the driving gas cylinder, releasing high-pressure nitrogen. The high-pressure nitrogen is divided into two paths: one path reduces the pressure to 1 MPa through the pressure reducing valve, and then injects the nitrogen into the fire extinguishing agent cylinder through a hose to propel the fire extinguishing agent for fire extinguishing; the other path opens the water flow valve through the copper pipe, and after the fire extinguishing agent is discharged, tap water is sprayed from the pipeline through the water flow valve to cool the area.

[0040] The present invention addresses the issue of the original mechanical actuator, which was structurally divided into two parts: a locking mechanism and a driving mechanism. This two-part structure was complex and prone to instability during operation. The driving mechanism is circular, while the locking mechanism is quadrilateral, connected by casting. Within the driving mechanism, the needle and needle rod, under the action of a spring, generate a downward force to puncture the driving gas cylinder, releasing and driving the extinguishing agent. The locking mechanism locks the needle rod behind the compressed spring, secured by the pointed end of a locking tongue. This mechanism includes a manual start lever and a temperature-sensitive start lever. Pulling either lever pushes the locking tongue, releasing the needle rod. Under the force of the spring, the needle rod generates a downward force, puncturing the driving gas cylinder.

[0041] The mechanical actuator for a kitchen fire extinguishing device according to this utility model includes a valve cover 1, a valve body 2, a shaft 3, a spring 4, a piston 5, a needle rod 6, a buffer pad 7, a hook actuating rod 8, and a torsion spring. ① 9. Torsion spring ② Composed of 10. Rotating shaft, 11. Hook plate, 12. Starting plate, 13. Emergency start pull ring, 14. Reset-safety wrench, and 15.

[0042] The mechanical actuator for a kitchen equipment fire extinguishing device described in this utility model combines the driving mechanism and the locking mechanism, making the structure more compact and reasonable. The contact area between the hook starting rod and the hook plate is larger, and the working stability of the actuator is greatly improved.

[0043] The working principle of the mechanical actuator for the fire extinguishing device of the kitchen equipment described in this utility model is as follows: the reset end of the reset-safety wrench 15 is inserted into the first hole of the shaft 3, which is also called the reset hole. By pulling up the shaft 3, piston 5 and needle rod 6 through the reset-safety wrench 13, the spring 4 is compressed in the space between the valve cover and piston 5, which drives the hook starting rod 8 to be pulled up. The hook plate 12 is torsion spring ① 9 and torsion spring ② Under the elastic force of 10, the hook plate 12 is moved towards the hook starting rod 8 and locked, putting the mechanical drive into operation. When the kitchen equipment fire extinguishing device is not activated, the safety end of the reset-safe wrench 15 can be inserted into the second hole of the shaft 3. The second hole is also called the safety hole, which can only be seen after the reset hole is pulled up. This structure is used as a safety pin to avoid accidental operation when not activated, thus preventing losses to the customer. The temperature-sensitive fusible release mechanism is connected to the corresponding hole of the starting plate 13 via a steel wire rope, and the tension spring wrench is connected to the corresponding hole of the hook plate via a steel wire rope. The hand-pulled starter box is connected to the corresponding hole of the hook plate via a steel wire rope. When the kitchen equipment fire extinguishing device is in the activated state, pull out the reset-safety wrench 15 to open the mechanical drive automatically or manually. In automatic mode, the temperature-sensitive fusible release mechanism is released, and the starting plate 13 moves in the opposite direction to the hook starting rod 8 under the pulling force of the tension spring wrench. When the hook starting rod 8 leaves the hook groove of the hook plate 12, the coaxial rod 3, piston 5 and piercing rod 6 of the starting rod 8 are ejected downward under the elastic force of the spring 4, thereby piercing the driving gas cylinder to extinguish the fire.

[0044] The mechanical actuator for a kitchen equipment fire extinguishing device described in this utility model has two outlets at the connection end between its valve body 2 and the driving gas cylinder. One end is equipped with a pressure reducing valve when assembling the kitchen equipment fire extinguishing device, and the other end is connected to the water flow valve through a copper pipe to drive the fire extinguishing agent to extinguish the fire.

[0045] The mechanical actuator for a kitchen fire extinguishing device described in this utility model has two threaded holes on the upper end of the valve body 2 for fixing a micro switch. The function of the micro switch is to transmit signals to the central control room, ventilation system, etc. when the device is turned on. The terminals of the micro switch are attached to the hook plate 12. When the hook plate 12 is activated, it will drive the terminals to move and turn on the micro switch.

[0046] The mechanical actuator for a kitchen fire extinguishing device described in this utility model addresses the issue of low flow rate by milling a square hole on the cylindrical surface of the needle part of the needle rod 6, thereby increasing the flow area of ​​the driving gas.

[0047] Connect the shaft 3 and the needle rod 6 to the piston 5 via threads and tighten them. Then, apply lubricating silicone grease to both O-rings 601 and insert them into the corresponding grooves of the needle rod 6. Install the buffer pad 7 into the valve body 2, and place the assembled shaft 3, piston 5, and needle rod 6 assembly into the valve body 2, ensuring it is tightly against the buffer pad 7. Adjust the hole position of the piston 5, and insert the hook actuating rod 8 into the corresponding holes of the valve body 2 and piston 5. Then, put the spring 4 on the shaft 3, insert it, and ensure it is tightly against the end face of the piston 5. Put the valve cover 1 on the shaft 3, press it against the spring 4, and screw it into the thread of the valve body 2, then tighten it.

[0048] torsion springs in sequence ① 9 and torsion spring ② 10. Hook plate 12 and starter plate 13 are fixed to both ends of valve body 2 via rotating shaft 11, and torsion springs are used to... ① 9 and torsion spring ② The 10 ring is fixed to both ends of the valve body 2 with two hexagonal head bolts 201, and the torsion spring is... ① 9 and torsion spring ② The other end of 10 is hooked onto the two vertical surfaces of the hook plate 12. Using screws 204, fix the micro switch 202 and the micro-opening washer 203 to the valve body 2, ensuring that the terminal of the micro switch 202 rests on the vertical surface of the hook plate 12. Insert the reset / safety wrench 15 into the hole in the shaft 3 to prevent loss.

[0049] After the mechanical actuator is assembled, an airtightness test is performed at the lower needle. After the airtightness test is passed, the driving force is tested. It can only be used after it meets the requirements.

[0050] This utility model patent applies to fire extinguishing devices for kitchen equipment. Its main function is to use a needle in a mechanical actuator to puncture the valve of the driving gas cylinder container when a fire occurs in the kitchen, releasing the driving gas. When the driving gas is released, it pushes the extinguishing agent to the nozzle at the stove or flue, where the extinguishing agent is atomized and sprayed out to extinguish the fire.

[0051] With the rapid development of the national economy, hotels, restaurants, and eateries have sprung up in major cities and even smaller towns. Fires frequently occur in the commercial kitchens of these establishments due to open flame operations and the accumulation of grease in stoves, exhaust hoods, and ventilation ducts. While bringing huge business opportunities, these establishments also pose a significant threat of kitchen fires. Therefore, fire protection in commercial kitchens has become a crucial aspect of fire safety. Kitchen fire extinguishing systems are quite mature and widely used in the kitchens of restaurants, hospitals, schools, and government departments.

[0052] The existing mechanical actuator, due to its two-piece structure, occupies a large space and has a complex internal structure. The contact area between the locking tongue and the pin is small, making it prone to malfunction and resulting in poor reliability. During installation, malfunctions frequently occur due to minor impacts. Therefore, it was decided to develop a mechanical actuator that is less prone to malfunctions and integrates the locking mechanism and drive structure into one unit. (For details of the old mechanical actuator, see...) Figure 5 )

[0053] In this utility model patent, the locking mechanism and the driving mechanism are integrated into one unit. To prevent accidental activation due to slight vibration, a starting rod 8 is set on the needle rod 6 and connected to it through the piston 5. The contact area between the hook plate 12 and the starting rod 8 is increased. Through calculation and experimentation, the optimal angle and size of the hook groove of the hook plate are obtained.

[0054] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship 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. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the technical scope disclosed in this utility model, and within the spirit and principles of this utility model, should be included within the protection scope of this utility model.

Claims

1. A mechanical actuator for a kitchen equipment fire extinguishing device, characterized in that, It consists of a valve cover, valve body, shaft, spring, piston, needle rod, buffer pad, hook start rod, torsion spring, rotating shaft, hook plate, start plate, reset-safety wrench, and emergency start pull ring; The valve body is connected to the driving gas cylinder at two outlets. One end is equipped with a pressure reducing valve, and the other end is connected to the water flow valve through a copper pipe. There are two threaded holes at the upper end of the valve body for fixing a micro switch; the function of the micro switch is to transmit a signal to the central control room and the ventilation system when the device is turned on; the terminals of the micro switch are attached to the hook plate. The needle rod has a needle part, and a square hole is opened on the cylindrical surface of the needle part; The piston is threadedly connected to the shaft and the needle rod, respectively, and both the shaft and the needle rod are screwed tightly relative to the piston. The needle rod has corresponding grooves, and two O-rings are coated with lubricating silicone grease and fitted into their respective grooves. A buffer pad is installed inside the valve body. The assembly formed by the shaft, piston, and needle rod is placed inside the valve body, and this assembly is tightly fitted against the buffer pad. Corresponding holes are provided on both the valve body and the piston. The hook-operated rod is fitted into the corresponding holes in the valve body and piston to achieve hole alignment between the valve body and piston. A spring is fitted on the shaft, with one end of the spring tightly against the end face of the piston. The valve cover is fitted on the shaft, with one end of the valve cover pressing against the spring and the other end screwed into the threaded portion of the valve body. Two torsion springs, a hook plate, and a starter plate are fixedly mounted on both ends of the valve body via a rotating shaft. The rings of the two torsion springs are fixed to both ends of the valve body by two hexagonal head bolts, and the other end of each torsion spring is hooked onto the two vertical surfaces of the hook plate. A micro switch and a micro-opening washer are fixedly mounted on the valve body by screws, and the terminals of the micro switch rest on the vertical surface of the hook plate. A hole is opened on the shaft, and a reset-safety wrench is inserted into the hole of the shaft.

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