Flame-retardant fireproof smoke extractor

Abstract

The utility model discloses a flame-retardant fireproof smoke extractor. The flue and the fan are located in the range hood shell, the wind scooper and the outer flame sensor are located on the lower side of the range hood shell, the fireproof baffle is arranged on the lower side of the range hood shell, the controller is arranged in the range hood shell and is in communication conduction connection with the outer flame sensor and a fan circuit switch, and the lower edge of the fireproof baffle is installed in a hinged mode. A bayonet lock for blocking the fireproof baffle to keep the fireproof baffle vertical and a starter for pulling the bayonet lock to retreat to release the fireproof baffle are arranged in the range hood shell, and a limiter for keeping the fireproof baffle in a flat blocking state after the fireproof baffle is turned over is arranged between the range hood shell and the fireproof baffle. The outer flame sensor feeds fire back to the controller, the controller instructs the starter to pull the bayonet lock to retreat to release the fireproof baffle to enable the fireproof baffle to be turned forwards to be in a flat blocking state, the crosspiece is arranged between the cooking range and the smoke exhaust machine, the cooking range or the stove on fire is covered, flame is prevented from directly moving upwards, airflow between a fire source and the smoke exhaust machine is cut off, and the fire is effectively limited.

Description

Technical Field

[0001] This utility model relates to kitchen fume extraction technology, and more particularly to a flame-retardant and fireproof exhaust fan. Background Technology

[0002] Range hoods are essential kitchen appliances. They use a suction fan to draw in cooking fumes, especially those rising above cooking utensils, and then exhaust them outdoors through a vent pipe. Currently, gas stoves are still the primary cooking method in kitchens. However, cooking is often forgotten by older people and even younger people, leading to frequent fires caused by dry-burning of cooking utensils. When unattended, the gas stove can easily ignite the food being cooked on dry-burning utensils, causing a continuous fire. The suction fan then pulls the flames upwards, igniting the range hood and potentially igniting nearby cabinets, leading to a larger fire. Repairing these fixed appliances is also more complicated and costly.

[0003] Currently, range hoods with automatic fire extinguishing functions have been invented. For example, the Chinese Utility Model Patent No. ZL201620779684.4 (Authorization Announcement No. CN205913671U) discloses "A Fire Extinguishing System and a Range Hood." This fire extinguishing system includes a temperature sensor, a fire extinguishing device, and a controller. The temperature sensor detects the temperature of the range hood, and the fire extinguishing device sprays a fire extinguishing medium. Within a preset time, when the temperature value exceeds a preset temperature, the controller controls the fire extinguishing device to perform the fire extinguishing action. Thus, after this fire extinguishing system is integrated into the range hood, the range hood can determine whether a fire has occurred through the temperature sensor, and after a fire occurs, the controller controls the fire extinguishing device to perform the fire extinguishing action.

[0004] Chinese utility model patent CN212378045U, "A Range Hood with Fire Extinguishing Function," discloses a built-in fire extinguishing device. Chinese invention patent application CN107961460A, "An Automatic Fire Extinguishing Device for a Range Hood Exhaust System," discloses a continuous fire-extinguishing sprinkler system. However, these range hoods cannot effectively isolate the exhaust duct from the fire source when the fire extinguishing device is working. Once the built-in fire extinguishing material is depleted, the fire quickly spreads, creating a larger fire scene. Furthermore, the continuous spraying of the sprinkler system may damage kitchen appliances and the range hood, and may even ignite inside the range hood, causing flames to easily spread to nearby cabinets and other hard furnishings, resulting in greater damage. This easily leads to the spread of the fire, hindering rapid fire extinguishing and resulting in poor fire suppression effectiveness. In conclusion, further improvements are needed to the structure of existing range hoods with automatic fire extinguishing devices. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a flame-retardant and fireproof smoke exhaust fan with better flame-retardant effect that directly cuts off the fire source.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a flame-retardant and fireproof exhaust fan, which includes a fan housing, a flue located inside the fan housing, a fan located in the flue or at the air inlet of the flue, an air guide hood located on the lower side of the fan housing, an external flame sensor located on the air guide hood, a fireproof baffle installed on the lower side of the fan housing and the air guide hood, and a controller located inside the fan housing and communicating and conductively connected to the external flame sensor and the fan circuit switch. The lower edge of the fireproof baffle is hinged so that the fireproof baffle can be flipped forward to cover the bottom of the air guide hood. The fan housing is provided with a locking pin that extends downward and blocks the fireproof baffle to keep it in an upright state. An actuator that can pull the locking pin to retract and release the fireproof baffle is provided. The actuator is communicating and conductively connected to the controller. A limiter is provided between the fan housing and the fireproof baffle to keep the fireproof baffle in a flat state after it is flipped open.

[0007] As an improvement to the technical solution of the flame-retardant and fireproof exhaust fan of this utility model, it also includes a gas control valve located at the gas supply pipe of the gas stove and connected to the controller for communication and transmission to cut off the gas circuit.

[0008] As an improvement to the technical solution of the flame-retardant and fireproof smoke exhaust fan of this utility model, an internal flame sensor is provided on the inner wall of the flue and is communicatively connected to the controller.

[0009] As an improvement to the technical solution of the flame-retardant and fireproof exhaust fan of this utility model, the fan housing is provided with an elastic lever that extends downward and is located behind the fireproof baffle, which can push the fireproof baffle forward.

[0010] As an improvement to the technical solution of the flame-retardant and fireproof exhaust fan of this utility model, the elastic lever is a forward-curved rear-arch shape, with its middle part hinged to the lower edge of the fan housing. The fan housing is provided with a slider that can slide vertically and press the upper part of the elastic lever backward. The starter can drive the slider to move upward.

[0011] As an improvement to the technical solution of the flame-retardant and fireproof exhaust fan of this utility model, the locking pin is block-shaped and equipped with a sliding seat so that it can slide vertically relative to the exhaust fan housing; the starter is an electromagnet.

[0012] As an improvement to the technical solution of the flame-retardant and fireproof exhaust fan of this utility model, an ultrasonic sensor that can be communicated and conductively connected to the controller is provided on the front side of the fan housing; a communication module that can be communicated and conductively connected to the controller is provided inside the fan housing, and the communication module can send abnormal status information of the fan to a designated mobile terminal through the Internet.

[0013] As an improvement to the technical solution of the flame-retardant and fireproof exhaust fan of this utility model, a hanging bracket is provided on the lower side of the fan housing. The upper end of the hanging bracket is connected to the fan housing, and its lower end is hinged to the lower edge of the fireproof baffle.

[0014] As an improvement to the technical solution of the flame-retardant and fireproof exhaust fan of this utility model, the limiter is a plate-shaped pull rod with its upper end extending into the fan housing and having an anti-detachment buckle. A buffer is provided between the anti-detachment buckle and the fan housing.

[0015] As an improvement to the technical solution of the flame-retardant and fireproof smoke exhaust fan of this utility model, the limiter is a steel wire rope, telescopic rod, or bending rod hidden behind the fireproof baffle. The telescopic rod includes an upper and lower pull plate that can be slackly extended and retracted, and the bending rod includes at least two plate-shaped pull rods that are segmented and hinged and can be bent.

[0016] The beneficial effects of this utility model are as follows: When the external flame sensor detects a fire, it will feed back to the controller. If the controller determines that an unexpected fire has occurred, it will instruct the starter to produce a pulling action, causing the locking pin to retract and release the fireproof baffle. Under the action of gravity or the action of forward starting force, the fireproof baffle flips forward and flips to a horizontal or slightly tilted flat baffle state under the blocking action of the limiter. The horizontal baffle is between the stove and the exhaust fan, covering the stove or stove that is on fire, preventing the flames from directly rising, and cutting off the airflow between the fire source and the exhaust fan and the exhaust fan's flue, thereby more effectively limiting the spread of the fire. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a flame-retardant and fireproof smoke exhaust fan of this utility model from a side-tilt perspective.

[0018] Figure 2 This is a side-view perspective three-dimensional structural diagram of a flame-retardant and fireproof smoke exhaust fan according to this utility model.

[0019] Figure 3 for Figure 2 The diagram shows a partial cross-section of a flame-retardant and fireproof smoke extraction fan.

[0020] Figure 4 This is a schematic diagram of the left-side structure of the smoke machine casing and flue of a flame-retardant and fireproof smoke exhaust fan according to the present invention.

[0021] Figure 5 This is a partial top view of the rear center of a flame-retardant and fireproof smoke exhaust fan, showing the locking and activation components in the fireproof baffle assembly.

[0022] Figure 6 This is a three-dimensional structural diagram of the flame-retardant and fireproof smoke exhaust fan of this utility model from a right-side upward perspective.

[0023] Figure 7 This is a three-dimensional structural diagram of the flame-retardant and fireproof smoke exhaust fan of this utility model from a top-down perspective.

[0024] Figure 8 This is a three-dimensional structural diagram of the front side of the fireproof baffle assembly in a flame-retardant and fireproof smoke exhaust fan of this utility model.

[0025] Figure 9 for Figure 8 A three-dimensional structural diagram of the locking and activation components in the fireproof baffle assembly.

[0026] Figure 10 for Figure 8 A partial three-dimensional structural diagram of the fireproof baffle assembly.

[0027] Figure 11 This is a three-dimensional structural diagram of the rear side of the fireproof baffle assembly in a flame-retardant and fireproof smoke exhaust fan of this utility model.

[0028] Figure 12 for Figure 11 A three-dimensional structural diagram of the locking and activation components in the fireproof baffle assembly.

[0029] Figure 13 for Figure 11 A partial three-dimensional structural diagram of the fireproof baffle assembly.

[0030] Figure 14 This is a structural diagram of the control system of a flame-retardant and fireproof smoke exhaust fan according to this utility model.

[0031] Figure 15 This is a three-dimensional structural diagram of the guide sleeve seat.

[0032] Figure 16 This is a three-dimensional structural diagram of the guide sleeve seat.

[0033] Figure 17 This is a schematic diagram of the bent tie rod. Detailed Implementation

[0034] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0035] like Figures 1 to 11 , Figure 14As shown, this utility model discloses a flame-retardant and fireproof exhaust fan, which includes a fan housing 11, a flue 12 located inside the fan housing, a fan 13 located in the flue or at the air inlet of the flue 12, an air guide hood 15 located on the lower side of the fan housing 11, an external flame sensor 16 located on the air guide hood 15, a fireproof baffle 21 installed on the lower side of the fan housing 11 and the air guide hood 15, and a control unit located inside the fan housing 11 and communicating with the circuit switch of the external flame sensor 16 and the fan 13. The lower edge of the fireproof baffle 21 is hinged to the controller 55 so that the fireproof baffle 21 can be flipped forward to cover the bottom of the air guide hood 15. The smoke hood housing 11 is provided with a locking pin 31 that extends downward and blocks the fireproof baffle 21 to keep it in an upright state. An actuator can be pulled to pull the locking pin 31 back to release the fireproof baffle 21. The actuator is communicatively connected to the controller 55. A limiter is provided between the smoke hood housing 11 and the fireproof baffle 21 to keep the fireproof baffle 21 in a flat state after it is flipped open. When the external flame sensor 16 detects a fire, it will send feedback to the controller. If the controller 55 determines that an unexpected fire has occurred, it will instruct the starter to perform a pulling action, causing the latch 31 to retract and release the fireproof baffle 21. Under the action of gravity or the action of the forward starting thrust, the fireproof baffle 21 flips forward and flips to a horizontal or slightly tilted flat state under the blocking action of the limiter. The horizontal baffle is between the stove and the range hood, covering the stove or stove that is on fire, preventing the flames from directly rising, cutting off the airflow between the fire source and the range hood and the range hood's flue, thereby more effectively protecting the range hood and hard-furnished cabinets, and limiting the spread of the fire.

[0036] At the same time, upon confirmation of the fire, while releasing the fireproof baffle 21, the fan 13 operates in reverse at low speed, sending air in the opposite direction to create a reverse positive pressure in the flue, preventing smoke and fire from continuing to enter the flue 12 and preventing the fire from spreading.

[0037] Among them, such as Figure 14 As shown, the flame-retardant and fireproof exhaust fan also includes a gas control valve 52 located at the gas supply pipe of the gas stove and connected to the controller 55 for communication and transmission to cut off the gas circuit 51. When the sensor detects an unexpected fire, it notifies the controller 55, which then instructs the gas control valve 52 to cut off the gas supply, depriving the stove of fuel and stopping combustion. This effectively controls the fire at its source and reduces the tendency for the fire to spread.

[0038] Among them, such as Figure 3 , Figure 14As shown, an inner flame sensor 18 is provided on the inner wall of the flue 12 and is communicatively connected to the controller 55. This sensor can detect whether flames have entered the flue 12. Combined with the feedback signal from the outer flame sensor 16, the controller can comprehensively judge the state of the fire and take appropriate measures to control the fire. This avoids misjudging the situation by opening the fireproof baffle 21 when there are upward flames during stir-frying but it is not a fire.

[0039] Among them, such as Figure 11 , Figure 12 , Figure 13 As shown, the smoke hood housing 11 is provided with an elastic lever 61 that extends downward and is located behind the fireproof baffle, which can push the fireproof baffle 21 forward. When the locking pin 31 is pulled out, the elastic lever 61 can generate a forward thrust, quickly and effectively pushing out the fireproof baffle 21 so that it flips forward, preventing the fireproof baffle 21 from standing upright and failing to block and cut off the fire source.

[0040] Furthermore, such as Figure 12 As shown, the elastic lever 61 is a forward-curved, rear-arched shape, with its middle section hinged to the lower edge of the range hood housing 11. Inside the range hood housing 11 is a slider 66 that can slide vertically and press the upper section of the elastic lever 61 backward. The actuator can drive the slider 66 to move upward. The actuator drives the slider 66 upward, and the slider 66 slides vertically along its guide rail / slot 63, thereby pressing the upper section of the forward-swinging elastic lever 61, causing it to produce a seesaw motion. That is, while the upper section swings backward, the lower end of the elastic lever 61 swings forward, thereby pushing the fireproof baffle 21 to flip forward. The elastic lever 61 has hinge shafts 62 extending to both sides in its middle, allowing the elastic lever 61 to be oscillatingly mounted inside the range hood housing 11.

[0041] Among them, such as Figure 5 , Figures 8 to 13 , Figure 15 , Figure 16 As shown, the locking pin 31 is block-shaped and has a sliding base 32, allowing it to slide vertically relative to the range hood housing 11. When sliding down, it can lock the upper edge of the fireproof baffle 21; when sliding up, it can release the fireproof baffle 21. The starter is an electromagnet 36 located above the sliding base 32 of the locking pin 31. The controller can instruct the electromagnet 36 to start, thereby generating a suction force that attracts the sliding base 32 of the locking pin 31 to move upward, thus causing the locking pin 31 to slide upward and release the fireproof baffle 21. Typically, a guide sleeve 33 is provided inside the range hood housing 11. The guide sleeve 33 has a sliding groove 34, which can limit the multiple degrees of freedom of the sliding base 32, allowing it to slide vertically only along the sliding groove 34, thereby ensuring the accuracy of the locking position of the locking pin 31. The guide sleeve 33 can be installed against the rear side wall of the range hood housing 11, using the wall of the range hood housing as one side wall.

[0042] The guide groove 63 of the slider 66 is formed in the guide sleeve 33, with one seat serving as a sliding guide for the two sliding components. Alternatively, the slider 66 and the slide 32 can be integrated as a single component, moving synchronously. Separating them avoids the slider 66 getting stuck in the guide groove, which could affect the retracting action of the slide 32 and the locking pin 31. The bottom end of the guide sleeve 33 has a recessed position that matches the hinge shaft 62, forming a hinged connection structure, allowing the elastic lever 61 to swing along the hinge shaft 62. The elastic buffer of the elastic lever 61 provides a smooth transmission effect for the actuating force, thus slowly transmitting the rapid starting action of the electromagnet 36 to the fireproof baffle 21, gently prying open the upper edge of the fireproof baffle 21 and flipping it open.

[0043] Among them, such as Figure 1 , Figure 2 As shown, the front of the range hood housing 11 is equipped with an ultrasonic sensor 19 that can be communicated and conductively connected to the controller. The ultrasonic sensor 19 monitors whether anyone is operating the stove on the front side of the range hood. If someone is operating it, the controller determines it as stir-frying and will not release the fireproof baffle 11 or cut off the gas supply. If an uncontrolled fire does occur, it can be extinguished manually. Of course, if the fire is out of control, the operator can quickly evacuate, and then the controller will release the fireproof baffle 21. The range hood housing 11 is equipped with a communication module 53 that can be communicated and conductively connected to the controller 55. This communication module 53 can send abnormal status information of the range hood to a designated mobile terminal via the Internet. After the signal / information of range hood abnormality / fire out of control is sent to the mobile terminal, the terminal owner can take immediate action if at home; otherwise, family members can be notified to take action.

[0044] Among them, such as Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 11 As shown, a bracket 22 is provided on the lower side of the range hood housing 11. The upper end of the bracket 22 is connected to the range hood housing 11, and its lower end is hinged to the lower edge of the fireproof baffle 21. The bracket 22 is inserted into the bottom side of the range hood housing 11 and can be fixedly connected or fastened to the range hood housing 11 to form a precise vertical dimension positioning, which facilitates the determination of the lower edge position of the fireproof baffle 21, so that the locking pin 31 can block the upper edge of the fireproof baffle 21 to maintain the fireproof baffle 21 in an upright / closed state. The load-bearing capacity of the bracket 22 can be borne by the range hood housing 11 or by the wall-mounted expansion screws provided on the back side.

[0045] Specifically, such as Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 11As shown, the bottom side of the range hood housing 11 is provided with a hanging interface 17. Inside the range hood housing 11, there are opposing sliding grooves 72 located on both sides of the hanging interface 17 and extending obliquely forward and upward. Hanging beams 73 are slidably disposed at both ends within the opposing sliding grooves. The upper end 22a of the hanging bracket 22 is provided with a hook 23 and an upwardly extending limiting baffle 24. The front side of the hook 23 is an inclined slope 23a that can push the hanging beam 73 to slide and make way. The upper end 22a of the hanging bracket 22 is inserted into the hanging interface 17. When the height of the hook 23 exceeds the hanging beam 73, the hanging beam 73 slides down to the lower side of the hook 23, preventing the hook 23 from retracting downward, forming a lower limit and completing the hanging action. At this time, the rear side of the limiting baffle 24 of the hanging bracket 22 abuts against the interior of the range hood housing 11, forming a lateral rear limit, preventing the hanging bracket 22 from swinging / wobbling back and forth.

[0046] Among them, such as Figure 6 , Figure 7 , Figure 11 As shown, the limiter is a sheet-like pull rod 28, the upper end of which extends movably into the range hood housing 11 and is equipped with an anti-detachment buckle 29. The lower end of the sheet-like pull rod 28 is hinged to the fireproof baffle 21, so that the fireproof baffle 21 remains taut and connected to the sheet-like pull rod 28 throughout the opening process. The anti-detachment buckle 29 limits the upper limit position of the sheet-like pull rod 28 when it is pulled out, limiting the maximum amplitude / angle of the fireproof baffle 21 opening and maintaining it in a flat blocking state to block flames. A buffer, such as a tension spring, is provided between the anti-detachment buckle 29 and the range hood housing 11, thereby slowing down and buffering the sheet-like pull rod 28 during the pulling process, preventing the anti-detachment buckle 29 from suddenly impacting the limit blocking part and preventing the limiter from failing due to rapid impact.

[0047] The limiter is a steel wire rope, telescopic rod, or bent rod hidden behind the fireproof baffle 21. These types of rods can limit the fireproof baffle 21 from excessive opening and limit its opening to a basically horizontal, flat state. The upper end of the steel wire rope has a limit buckle that limits the maximum extension length of the steel wire rope, indirectly limiting the opening angle of the fireproof baffle 21. A tension spring can be provided at the upper end of the steel wire rope to buffer the wire rope, reducing the sudden impact of the limit buckle on the smoke machine housing 11 and slowing down the extension speed of the steel wire rope. The telescopic rod includes a movable upper and lower pull tab, which are connected to each other by a sliding sleeve. It can extend and retract along the sliding sleeve, and when extended to its maximum length, it limits the opening angle of the fireproof baffle 21, limiting it to a basically horizontal, flat state; when the fireproof baffle 21 is retracted, the upper and lower pull tabs retract, shortening the overall length. Figure 17As shown, the bending tie rod includes at least two segmented, hinged, and bendable sheet-like tie rods, typically two- or three-sectioned. One section is vertically concealed behind the fireproof baffle 21, while another section extends laterally forward and backward on the bottom surface of the air guide hood or smoke hood housing 11, folding flat with the air guide hood to create a concealed appearance. If there is a third section, it is concealed within the smoke hood housing 11.

[0048] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A flame-retardant and fireproof smoke extraction fan, characterized in that: The system includes a smoke hood housing, a flue located within the smoke hood housing, a fan located in or at the air inlet of the flue, an air guide hood located on the lower side of the smoke hood housing, an external flame sensor located on the air guide hood, a fireproof baffle installed on the lower side of the smoke hood housing and the air guide hood, and a controller located within the smoke hood housing and communicatively connected to the external flame sensor and the fan circuit switch. The lower edge of the fireproof baffle is hinged so that the fireproof baffle can be flipped forward to cover the underside of the air guide hood. The smoke hood housing has a locking pin that extends downward to prevent the fireproof baffle from being in an upright position, and an actuator that can pull the locking pin to retract and release the fireproof baffle. The actuator is communicatively connected to the controller. A limiter is provided between the smoke hood housing and the fireproof baffle to keep the fireproof baffle in a flat position after it is flipped open.

2. The flame-retardant and fireproof smoke exhaust fan according to claim 1, characterized in that: It also includes a gas control valve located at the gas supply pipe of the gas stove and connected in communication with the controller to cut off the gas supply.

3. The flame-retardant and fireproof smoke exhaust fan according to claim 1 or 2, characterized in that: An internal flame sensor, which is in communication and conductive connection with the controller, is provided on the inner wall of the flue.

4. The flame-retardant and fireproof smoke exhaust fan according to claim 1, characterized in that: The smoke hood housing is provided with an elastic lever that extends downward and is located behind the fireproof baffle, which can push the fireproof baffle forward.

5. The flame-retardant and fireproof smoke exhaust fan according to claim 4, characterized in that: The elastic lever is a forward-curved, rear-arched shape, with its middle part hinged to the lower edge of the range hood housing. The range hood housing is equipped with a slider that can slide vertically and press the upper part of the elastic lever backward. The starter can drive the slider to move upward.

6. The flame-retardant and fireproof smoke exhaust fan according to claim 1, characterized in that: The latch is block-shaped and has a sliding base so that it can slide vertically relative to the casing of the range hood; the starter is an electromagnet.

7. The flame-retardant and fireproof smoke exhaust fan according to claim 1, characterized in that: The front side of the range hood housing is equipped with an ultrasonic sensor that can be conductively connected to the controller; the range hood housing is equipped with a communication module that can be conductively connected to the controller, and the communication module can send abnormal status information of the range hood to a designated mobile terminal through the Internet.

8. The flame-retardant and fireproof smoke exhaust fan according to claim 1, characterized in that: The lower side of the smoke hood housing is provided with a hanging bracket, the upper end of which is connected to the smoke hood housing and the lower end of which is hinged to the lower edge of the fireproof baffle.

9. The flame-retardant and fireproof smoke exhaust fan according to claim 1, characterized in that: The limiter is a sheet-shaped pull rod with its upper end extending into the range hood housing and equipped with an anti-detachment buckle. A buffer is provided between the anti-detachment buckle and the range hood housing.

10. The flame-retardant and fireproof smoke exhaust fan according to claim 1, characterized in that: The limiter is a steel wire rope, telescopic rod, or bending rod hidden behind the fireproof baffle. The telescopic rod includes an upper and lower pull plate that can be slackly extended and retracted, and the bending rod includes at least two segmented hinged and bendable plate-shaped rods.

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