Ventilation cabinet with fire early warning detection and automatic fire extinguishing functions

Abstract

The invention relates to the technical field of fume cupboards, and discloses a fume cupboard with fire early warning detection and automatic fire extinguishing functions, which comprises a cupboard body, a working cavity is arranged at the upper part in the cupboard body, a storage bin is arranged on the cupboard body and is positioned below the working cavity, and a transverse partition plate is fixed at the upper position in the working cavity; a lamp bin and an induced draft fan are installed on the top of the transverse partition plate. According to the fume hood with the fire early warning detection and automatic fire extinguishing functions, four fire extinguishing agents including foam, dry powder, carbon dioxide and water are prepared, corresponding to different fire types, corresponding fire extinguishing strategies are selected for fire extinguishing according to the different fire types, and the fire extinguishing efficiency is greatly improved in the mode of'applying medicines according to indications'; the fire extinguishing device ensures that the fire is effectively and reliably extinguished at the initial stage, meanwhile, the spray head is in a swinging state, the fire extinguishing area is enlarged, and the sealing assembly blocks the opening of the working cavity, so that the working cavity is in a sealed state, and the fire in the working cavity is prevented from extending outwards.

Description

Technical Field

[0001] The present invention relates to the technical field of fume hoods, and in particular to a fume hood with fire early warning detection and automatic fire extinguishing functions. Background Art

[0002] In chemical and biological laboratories, fume hoods are critical safety equipment for handling flammable, explosive, and toxic chemicals. If a fire breaks out inside a fume hood, the consequences could be disastrous if timely warnings and effective extinguishing are not provided.

[0003] Most existing fume hood automatic fire extinguishing systems are only equipped with a single type of fire extinguishing agent. This design cannot cope with the various types of fires that may occur in the fume hood. The types of fires that occur in the fume hood are different. Using the same type of fire extinguishing agent cannot dynamically adjust the fire extinguishing strategy according to the fire type, resulting in poor fire extinguishing effect and inability to control the fire in a timely and effective manner. Summary of the Invention

[0004] In view of the above-mentioned problems that the existing fire extinguishing strategy cannot be dynamically adjusted according to the fire type and the fire cannot be controlled in a timely and effective manner, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a fume hood with fire early warning detection and automatic fire extinguishing functions, the purpose of which is to select different fire extinguishing strategies for fire extinguishing according to different fire types.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a fume hood with fire warning detection and automatic fire extinguishing functions, comprising a cabinet body, a working chamber is provided in the upper part of the interior of the cabinet body, a storage bin is installed on the cabinet body and below the working chamber, a transverse partition is fixed at the upper position inside the working chamber, a lamp bin and an exhaust fan are respectively installed on the top of the transverse partition, and a smoke sensor, a flame sensor, a temperature sensor and a camera are respectively installed on the bottom of the transverse partition.

[0007] A fire extinguishing assembly is installed on the top of the diaphragm and on both sides of the induced draft fan. The fire extinguishing assembly includes two smooth plates sliding on the top of the diaphragm, and three installation bins are installed at equal intervals on the top of the smooth plate. Fire extinguishing tanks are installed inside the three installation bins. The fire extinguishing assembly also includes a fire extinguishing pipe rotatably installed on both sides of the bottom of the diaphragm, and a nozzle is installed at the spraying end of the fire extinguishing pipe. The fire extinguishing pipe on the same side is connected to the three fire extinguishing tanks through a pipeline. A swinging structure for driving the two fire extinguishing pipes to rotate is installed on the back of the cabinet, and a shaking structure is installed between the smooth plates on both sides.

[0008] A sealing component is fixed on the top of the transverse partition, and the movable end of the sealing component is located inside the working cavity. Guide slides are provided at the front ends of both sides of the working cavity, and the movable end of the sealing component is located between the guide slides on both sides.

[0009] As an improved technical solution, the pipeline includes a cross-connecting pipe fixed to the top of the transverse partition by a bracket, a first hose is installed between the feed end of the cross-connecting pipe and the discharge end of the fire extinguishing tank, a one-way valve is installed at one end of the fire extinguishing pipe, a water injection pipe is fixed at the end of the one-way valve away from the cross-connecting pipe, and a second hose is installed between the discharge end of the cross-connecting pipe and the feed end of the fire extinguishing pipe.

[0010] As an improved technical solution, the swing structure includes a second electric telescopic rod fixed to the back of the cabinet through a bracket, the movable end of the second electric telescopic rod is fixedly connected to a lifting bar, and racks are fixed at both ends of the top of the lifting bar. A linkage shaft is coaxially fixed to the end of the fire extinguishing pipe close to the lifting bar, and a gear meshing with the rack is sleeved on the end of the linkage shaft away from the fire extinguishing pipe.

[0011] As an improved technical solution, protrusions are welded at both ends of the opposite surfaces of the two smooth plates, and the shaking structure includes four T-shaped rods fixed on the top of the cross-partition plate, and a driving plate is slidably installed between the four T-shaped rods. A linkage column is welded in the middle of the top of the driving plate, and a lifting plate is welded on the end of the linkage column away from the driving plate, and a push-pull strip is rotatably installed between the lifting plate and the protrusion on the same side.

[0012] As an improved technical solution, the shaking structure also includes a driving motor fixed to the top of the diaphragm through a pad, the driving end of the driving motor is fixed with a cam plate that drives the driving plate to rise and fall, and the vertical rod end of the T-bar is located above the driving plate and is sleeved with a spring.

[0013] As an improved technical solution, short shafts are rotatably mounted on both sides of the bottom of the lifting plate and the top of the protrusion through bearings, and the push-pull bar is rotatably mounted between the two short shafts on the same side.

[0014] As an improved technical solution, the sealing component includes a winding shaft rotatably installed on the top of the diaphragm, with baffles sleeved on both ends of the winding shaft, a fireproof cloth wrapped around the winding shaft, and a drop bar fixedly installed on the end of the fireproof cloth away from the winding shaft, and the two ends of the drop bar are respectively located inside the guide slides on both sides, the drop bar passes through the inside of the opening, and both ends of the winding shaft are fixed with fusible wires, and the end of the fusible wire away from the winding shaft is fixed inside the working chamber.

[0015] As an improved technical solution, the enclosed component also includes two L-shaped frames fixed to the top of the transverse partition, a first electric telescopic rod is fixed to the top of the L-shaped frame, a cutter is fixedly connected between the movable ends of the two first electric telescopic rods, and a chopping board strip is fixed to the top of the transverse partition and directly below the cutter.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are: 1. In the present invention, the reciprocating lifting and lowering of the second electric telescopic rod will synchronously drive the fire extinguishing pipes on both sides to rotate, so that the nozzles on both sides are in a swinging state, expanding the spraying range of the nozzles, and effectively spraying the fire extinguishing agent to the entire cavity inside the working chamber to extinguish the fire, effectively improving the fire extinguishing effect.

[0017] 2. The present invention drives the cam plate to rotate by a driving motor, and drives the smooth plates on both sides to move horizontally back and forth. When the smooth plates move horizontally at high frequency, the material inside the fire extinguisher tank will be in a shaking state, which will prevent the internal material from condensing and ensure the normal spraying of the material.

[0018] 3. In the present invention, the sealing component has two opening states. One is that the fusible line melts due to high temperature. The other opening method is to cut the fusible line with a cutter, and the fireproof cloth can also be opened to cover the opening of the working chamber. The fireproof cloth can be opened in two ways. Even if it cannot be opened naturally by high-temperature melting, it can be opened by cutting. Moreover, after opening, the sealing component will naturally unfold the fireproof cloth to cover it due to gravity, and the sealing is convenient and fast.

[0019] 4. The present invention is equipped with four fire extinguishing agents: foam, dry powder, carbon dioxide and water. It can respond to different fire types and select corresponding fire extinguishing strategies according to different fire types. This "targeted approach" greatly improves fire extinguishing efficiency and ensures that the fire is effectively and reliably extinguished in the early stages. At the same time, the nozzle is in a swinging state to expand the fire extinguishing area. In addition, the opening of the working chamber is blocked by the sealing component, making the working chamber sealed, avoiding the spread of the fire inside the working chamber, and helping to reduce the losses caused by the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them: Figure 1 This is a schematic diagram of the overall structure of a fume hood with fire early warning detection and automatic fire extinguishing functions according to the present invention.

[0021] Figure 2The figure is a schematic diagram of the structure inside the cabinet of a fume hood with fire early warning detection and automatic fire extinguishing functions according to the present invention.

[0022] Figure 3 The present invention is a structural schematic diagram of a fire extinguishing assembly of a fume hood with fire early warning detection and automatic fire extinguishing functions.

[0023] Figure 4 The present invention is a fume hood with fire early warning detection and automatic fire extinguishing functions Figure 3 Schematic diagram of the structure at point A.

[0024] Figure 5 This is a structural schematic diagram of a swing structure of a fume hood with fire early warning detection and automatic fire extinguishing functions according to the present invention.

[0025] Figure 6 This is a structural schematic diagram of a closed assembly of a fume hood with fire early warning detection and automatic fire extinguishing functions according to the present invention.

[0026] Figure 7 The present invention is a fume hood with fire early warning detection and automatic fire extinguishing functions Figure 6 Schematic diagram of the structure at point B.

[0027] Explanation of reference numerals: 1. cabinet; 2. storage compartment; 3. working chamber; 4. guide slide; 5. sealing assembly; 51. winding shaft; 52. baffle; 53. cutter; 54. first electric telescopic rod; 55. L-shaped frame; 56. cutting board; 57. fuse; 58. fireproof cloth; 59. pendant; 6. partition; 7. lamp compartment; 8. exhaust fan; 9. fire extinguishing assembly; 91. smooth plate; 92. installation compartment; 93. fire extinguishing tank; 94. shaking structure; 941. push-pull strip; 9 42. T-bar; 943. Lifting plate; 944. Linkage column; 945. Drive plate; 946. Cam plate; 947. Drive motor; 948. Spring; 95. Swinging structure; 951. Second electric telescopic rod; 952. Lifting bar; 953. Rack; 954. Gear; 955. Linkage shaft; 96. First hose; 97. Second hose; 98. Cross-connecting pipe; 99. Fire extinguishing pipe; 910. Sprinkler; 911. One-way valve; 912. Water injection pipe; 913. Bump. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example

[0029] Reference Figure 1-Figure 7, which is a first embodiment of the present invention, provides a fume hood with fire early warning detection and automatic fire extinguishing functions. This fume hood with fire early warning detection and automatic fire extinguishing functions includes a cabinet body 1, a working chamber 3 is provided in the upper part of the interior of the cabinet body 1, a storage bin 2 is installed on the cabinet body 1 and below the working chamber 3, a transverse partition 6 is fixed at an upper position inside the working chamber 3, a lamp bin 7 and an exhaust fan 8 are respectively installed on the top of the transverse partition 6, and an air suction hole is provided below the transverse partition 6 directly opposite the exhaust fan 8, an LED lamp is installed inside the lamp bin 7, and a smoke sensor, a flame sensor, a temperature sensor and a camera are respectively installed at the bottom of the transverse partition 6; The top of the diaphragm 6 is provided with a fire extinguishing assembly 9 on both sides of the induced draft fan 8. The fire extinguishing assembly 9 includes two smooth plates 91 sliding on the top of the diaphragm 6. The induced draft fan 8 is located between the smooth plates 91 on both sides. Two guide rails are installed on both sides of the top of the diaphragm 6. Two sliders sliding on the guide rails are installed at the bottom of the smooth plate 91. Three mounting bins 92 are installed at equal intervals on the top of the smooth plate 91. Fire extinguishing tanks 93 are installed between the interiors of the three mounting bins 92, and electromagnetic valves are installed at the outlets of the fire extinguishing tanks 93. The raw materials stored in the three fire extinguishing tanks 93 are foam, dry powder and carbon dioxide respectively. The fire extinguishing assembly 9 also includes a fire extinguishing pipe 99 rotatably installed on both sides of the bottom of the diaphragm 6. A nozzle 910 is installed at the spraying end of the fire extinguishing pipe 99. The fire extinguishing pipe 99 on the same side is connected to the three fire extinguishing tanks 93 by a pipeline. A swinging structure 95 for driving the two fire extinguishing pipes 99 to rotate is installed on the back of the cabinet 1, and a shaking structure 94 is installed between the smooth plates 91 on both sides. A sealing component 5 is fixed on the top of the transverse partition 6, and the movable end of the sealing component 5 is located inside the working chamber 3. A through opening is opened on the transverse partition 6 for the movable end of the sealing component 5 to pass through. Guide slides 4 are provided at the front end on both sides of the working chamber 3, and the movable end of the sealing component 5 is located between the guide slides 4 on both sides.

[0030] The pipeline includes a cross-connecting pipe 98 fixed to the top of the transverse partition 6 by a bracket, a first hose 96 is installed between the feed end of the cross-connecting pipe 98 and the discharge end of the fire extinguishing tank 93, a one-way valve 911 is installed at one end of the fire extinguishing pipe 99, a water injection pipe 912 is fixed to the end of the one-way valve 911 away from the cross-connecting pipe 98, and a second hose 97 is installed between the discharge end of the cross-connecting pipe 98 and the feed end of the fire extinguishing pipe 99.

[0031] The swinging structure 95 includes a second electric telescopic rod 951 fixed to the back of the cabinet 1 through a bracket. The movable end of the second electric telescopic rod 951 is fixedly connected to a lifting bar 952. Racks 953 are fixed at both ends of the top of the lifting bar 952. A linkage shaft 955 is coaxially fixed to the end of the fire extinguishing pipe 99 close to the lifting bar 952. The end of the linkage shaft 955 away from the fire extinguishing pipe 99 is sleeved with a gear 954 meshing with the rack 953. The reciprocating lifting and lowering of the second electric telescopic rod 951 will synchronously drive the fire extinguishing pipes 99 on both sides to rotate, so that the sprinklers 910 on both sides are in a swinging state, thereby expanding the spraying range of the sprinklers 910, and effectively spraying the fire extinguishing agent to extinguish the fire in the entire working chamber 3, thereby effectively improving the fire extinguishing effect.

[0032] During use, it is equipped with four fire extinguishing agents: foam, dry powder, carbon dioxide and water, which can correspond to different fire types. The corresponding fire extinguishing strategies are selected according to different fire types to extinguish the fire. This "symptomatic treatment" approach greatly improves the fire extinguishing efficiency and ensures that the fire is effectively and reliably extinguished in the early stage. At the same time, the nozzle 910 is in a swinging state to expand the fire extinguishing area, and the sealing component 5 blocks the opening of the working chamber 3, so that the working chamber 3 is in a sealed state, avoiding the spread of the fire inside the working chamber 3, which is conducive to reducing the losses caused by the fire. Example

[0033] Reference Figure 3-Figure 4 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: protrusions 913 are welded at both ends of the opposite surfaces of the two smooth plates 91, the shaking structure 94 includes four T-shaped rods 942 fixed to the top of the transverse partition 6, and a driving plate 945 is slidably installed between the four T-shaped rods 942. A linkage column 944 is welded to the middle part of the top of the driving plate 945, and a lifting plate 943 is welded to the end of the linkage column 944 away from the driving plate 945. A push-pull strip 941 is rotatably installed between the lifting plate 943 and the protrusion 913 on the same side.

[0034] The shaking structure 94 also includes a driving motor 947 fixed to the top of the transverse partition 6 by a pad. The driving motor 947 is located below the driving plate 945. The driving end of the driving motor 947 is fixed with a cam plate 946 that drives the driving plate 945 to rise and fall. The vertical rod end of the T-bar 942 is located above the driving plate 945 and is sleeved with a spring 948.

[0035] Short shafts are rotatably mounted on both sides of the bottom of the lifting plate 943 and the top of the protrusion 913 via bearings, and the push-pull bar 941 is rotatably mounted between the two short shafts on the same side.

[0036] During use, the cam plate 946 is driven to rotate by the driving motor 947, and the smooth plates 91 on both sides are driven to move horizontally back and forth. When the smooth plates 91 move horizontally at high frequency, the material inside the fire extinguishing tank 93 will be in a shaking state, which will prevent the internal material from condensing and ensure the normal spraying of the material.

[0037] The remaining structures are the same as those of Example 1. Example

[0038] Reference Figure 1 、 Figure 2 、 Figure 6-Figure 7 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the sealing component 5 includes a winding shaft 51 rotatably mounted on the top of the transverse partition 6, and baffles 52 are sleeved at both ends of the winding shaft 51. A fireproof cloth 58 is wound and mounted on the winding shaft 51, and the fireproof cloth 58 is located between the baffles 52 on both sides. A drop bar 59 is fixedly mounted on the end of the fireproof cloth 58 away from the winding shaft 51, and the two ends of the drop bar 59 are respectively located inside the guide slides 4 on both sides. The drop bar 59 passes through the inside of the through opening, and a fusible wire 57 is fixed at both ends of the winding shaft 51, and the end of the fusible wire 57 away from the winding shaft 51 is fixed inside the working chamber 3. The sealing component 5 blocks the opening of the working chamber 3, so that the working chamber 3 is in a sealed state, thereby avoiding the spread of fire inside the working chamber 3 and reducing the loss caused by the fire.

[0039] The sealing component 5 also includes two L-shaped frames 55 fixed to the top of the transverse partition 6, and a first electric telescopic rod 54 is fixed to the top of the L-shaped frame 55, and the movable end of the first electric telescopic rod 54 is located below the L-shaped frame 55. A cutter 53 is fixedly connected between the movable ends of the two first electric telescopic rods 54, and a chopping board strip 56 is fixed to the top of the transverse partition 6 and directly below the cutter 53, and the fuse 57 is located between the cutter 53 and the chopping board strip 56.

[0040] The process of sealing the working chamber 3 by the sealing component 5 is as follows: the sealing component 5 has two opening states. One is that the fusible wire 57 melts due to high temperature, and it will synchronously contact the pulling force on the winding shaft 51. Under the action of the gravity of the falling bar 59, the fireproof cloth 58 wrapped around the winding shaft 51 will be loosened, and the falling bar 59 falls to the bottom to unfold the fireproof cloth 58, and the fireproof cloth 58 covers the opening of the working chamber 3. The other opening method is that the first electric telescopic rod 54 is extended to drive the cutter 53 to move toward the direction of the anvil strip 56, and the fusible wire 57 is cut off by the cutter 53. The fireproof cloth 58 can also be opened to cover the opening of the working chamber 3.

[0041] During use, the fireproof cloth 58 can be opened in two ways. Even if it cannot be opened naturally by high-temperature melting, it can be opened by cutting. Moreover, after opening, the sealing component 5 will naturally unfold the fireproof cloth 58 to cover it due to gravity, making sealing convenient and quick.

[0042] The remaining structures are the same as those of Example 2.

[0043] Based on Examples 1-3, the working principle of the present invention is as follows: the smoke sensor, flame sensor, temperature sensor and camera are used in conjunction to perform real-time detection and judgment on whether a fire occurs inside the working chamber 3 and the corresponding fire type. After the judgment is completed, the corresponding fire extinguishing agent is selected to extinguish the fire.

[0044] Open the solenoid valve on the fire extinguishing tank 93, and the fire extinguishing agent inside the fire extinguishing tank 93 will be sprayed outward under the action of pressure. The fire extinguishing agent enters the interior of the fire extinguishing pipe 99 under the guidance of the first hose 96, the cross-connecting pipe 98 and the second hose 97, and is finally sprayed into the interior of the working chamber 3 through the nozzle 910 to extinguish the fire. Similarly, water can also be injected into the water injection pipe 912, and the water can be sprayed through the nozzle 910 to extinguish the fire.

[0045] During the process of the sprinkler 910 extinguishing the fire source, the second electric telescopic rod 951 is in a reciprocating telescopic state. The second electric telescopic rod 951 extends to drive the rack 953 to move upward. Under the meshing transmission action of the rack 953 and the gear 954, the fire extinguishing pipe 99 is driven to rotate through the linkage shaft 955, causing the fire extinguishing pipes 99 on both sides to rotate toward the middle at the same time, that is, the sprinkler head of the sprinkler 910 moves toward the middle. When the second electric telescopic rod 951 is shortened, the sprinkler head 910 rotates outward and resets.

[0046] While the fire extinguishing agent is sprayed through the cutter 53 to extinguish the fire, the drive motor 947 drives the cam plate 946 to rotate. During the rotation of the cam plate 946, it will resist the upward movement of the driving plate 945. When the driving plate 945 moves upward, on the one hand, the lifting plate 943 is driven to move upward through the linkage column 944, and on the other hand, the spring 948 is also compressed. When the lifting plate 943 moves upward, under the linkage action of the push-pull bar 941, the smooth plates 91 on both sides are pulled toward the middle at the same time. When the cam plate 946 gradually disengages from the lifting of the driving plate 945, under the elastic reset action of the spring 948, the lifting plate 943 moves downward and pushes the smooth plates 91 on both sides to both sides through the push-pull bars 941 on both sides, thereby expanding the distance between the smooth plates 91 on both sides.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fume hood with fire early warning detection and automatic fire extinguishing functions, comprising a cabinet body (1), a working chamber (3) being provided in the upper portion of the interior of the cabinet body (1), and a storage bin (2) being installed on the cabinet body (1) and below the working chamber (3), characterized in that: A transverse partition (6) is fixed at an upper position inside the working chamber (3), a lamp bin (7) and an exhaust fan (8) are respectively installed on the top of the transverse partition (6), and a smoke sensor, a flame sensor, a temperature sensor and a camera are respectively installed on the bottom of the transverse partition (6); A fire extinguishing assembly (9) is installed on the top of the transverse partition (6) and on both sides of the exhaust fan (8). The fire extinguishing assembly (9) includes two smooth plates (91) that slide on the top of the transverse partition (6). Three installation compartments (92) are installed at equal intervals on the top of the smooth plate (91). Fire extinguishing tanks (93) are installed between the interiors of the three installation compartments (92). The fire extinguishing assembly (9) also includes a fire extinguishing pipe (99) that is rotatably installed on both sides of the bottom of the transverse partition (6). A nozzle (910) is installed at the spray end of the fire extinguishing pipe (99). The fire extinguishing pipe (99) on the same side is connected to the three fire extinguishing tanks (93) through a pipeline. A swinging structure (95) for driving the two fire extinguishing pipes (99) to rotate is installed on the back of the cabinet (1). A shaking structure (94) is installed between the smooth plates (91) on both sides. A sealing component (5) is fixed to the top of the transverse partition (6), and the movable end of the sealing component (5) is located inside the working chamber (3). Guide slides (4) are provided at the front ends of both sides of the working chamber (3), and the movable end of the sealing component (5) is located between the guide slides (4) on both sides.

2. A fume hood with fire early warning detection and automatic fire extinguishing functions according to claim 1, characterized in that: The pipeline includes a cross-connecting pipe (98) fixed to the top of the transverse partition (6) through a bracket, a first hose (96) is installed between the feed end of the cross-connecting pipe (98) and the discharge end of the fire extinguishing tank (93), a one-way valve (911) is installed at one end of the fire extinguishing pipe (99), a water injection pipe (912) is fixed to the end of the one-way valve (911) away from the cross-connecting pipe (98), and a second hose (97) is installed between the discharge end of the cross-connecting pipe (98) and the feed end of the fire extinguishing pipe (99).

3. A fume hood with fire early warning detection and automatic fire extinguishing functions according to claim 2, characterized in that: The swing structure (95) comprises a second electric telescopic rod (951) fixed to the back of the cabinet (1) via a bracket, the movable end of the second electric telescopic rod (951) being fixedly connected to a lifting bar (952), racks (953) being fixed to both ends of the top of the lifting bar (952), a linkage shaft (955) being fixed coaxially to one end of the fire extinguishing pipe (99) close to the lifting bar (952), and a gear (954) meshing with the rack (953) being sleeved on one end of the linkage shaft (955) away from the fire extinguishing pipe (99).

4. A fume hood with fire early warning detection and automatic fire extinguishing functions according to claim 3, characterized in that: Both ends of the opposite surfaces of the two smooth plates (91) are welded with protrusions (913), the shaking structure (94) includes four T-shaped rods (942) fixed on the top of the transverse partition (6), a driving plate (945) is slidably installed between the four T-shaped rods (942), a linkage column (944) is welded in the middle of the top of the driving plate (945), a lifting plate (943) is welded at one end of the linkage column (944) away from the driving plate (945), and a push-pull strip (941) is rotatably installed between the lifting plate (943) and the protrusion (913) on the same side.

5. The fume hood with fire early warning detection and automatic fire extinguishing functions according to claim 4, characterized in that: The shaking structure (94) further comprises a driving motor (947) fixed to the top of the transverse partition (6) via a pad, a cam plate (946) for driving the driving plate (945) to move up and down fixed to the driving end of the driving motor (947), and a spring (948) is sleeved on the vertical rod end of the T-shaped rod (942) and located above the driving plate (945).

6. The fume hood with fire early warning detection and automatic fire extinguishing functions according to claim 5, characterized in that: Short shafts are rotatably mounted on both sides of the bottom of the lifting plate (943) and the top of the protrusion (913) via bearings, and the push-pull bar (941) is rotatably mounted between the two short shafts on the same side.

7. The fume hood with fire early warning detection and automatic fire extinguishing functions according to claim 6, characterized in that: The sealing component (5) includes a winding shaft (51) rotatably mounted on the top of the transverse partition (6), with baffles (52) sleeved on both ends of the winding shaft (51), a fireproof cloth (58) wound around the winding shaft (51), a drop bar (59) fixedly mounted on one end of the fireproof cloth (58) away from the winding shaft (51), and both ends of the drop bar (59) are respectively located inside the guide slides (4) on both sides, and the drop bar (59) passes through the inside of the through opening, and both ends of the winding shaft (51) are fixed with a fusible wire (57), and the end of the fusible wire (57) away from the winding shaft (51) is fixed inside the working chamber (3).

8. The fume hood with fire early warning detection and automatic fire extinguishing functions according to claim 7, characterized in that: The sealing assembly (5) further comprises two L-shaped frames (55) fixed to the top of the transverse partition (6), a first electric telescopic rod (54) being fixed to the top of the L-shaped frame (55), a cutter (53) being fixedly connected between the movable ends of the two first electric telescopic rods (54), and a cutting board strip (56) being fixed to the top of the transverse partition (6) and directly below the cutter (53).

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