Range hood capable of automatically detecting and extinguishing fire

Abstract

The invention relates to the technical field of range hoods, in particular to a range hood capable of automatically detecting and extinguishing fire, which comprises a machine body internally provided with a sensor, and at least one frame unit mounted at an opening in the bottom of the machine body, the bottom of the frame unit is provided with a water curtain spraying area; the range hood comprises a frame unit, the bottom of the frame unit is rotationally connected with a plurality of spray head units, the multiple spray head units are in sequential transmission through a transmission assembly, and a scanning fire extinguishing area is formed among the multiple spray head units. The water curtain spraying area of the frame unit is used for achieving fire retardance and smoke sealing operation on the cooking range, when a fire occurs, a water curtain is formed in the water curtain spraying area for protection, then the fire extinguishing action is gradually scanned on the ignition position of the cooking range through the arranged rotary spraying head assembly, and in the reciprocating rotation process, the fire extinguishing effect is greatly improved. And continuous, gradual and multi-time fire extinguishing operation from outside to inside can be formed on the stove.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a range hood capable of automatically detecting and extinguishing fires. Background Art

[0002] In a kitchen environment, range hoods and cooking stoves are commonly used devices. However, due to potential fires during the cooking process, the safety of these devices has become an important issue. To address potential fire risks, some modern range hoods are equipped with fire extinguishing functions. These fire extinguishing systems typically suppress flames by spraying a fire extinguishing matrix.

[0003] However, the existing fire extinguishing structures of range hoods cannot effectively block fire and seal smoke during the fire extinguishing process. Therefore, during the fire extinguishing process, smoke and fire may still spread, affecting the fire extinguishing effect. Secondly, the spraying angles of existing fire extinguishing systems are usually relatively single. They can only achieve fixed-angle spraying and cannot reciprocally perform fire extinguishing operations on the combustion site. Therefore, there may be fire extinguishing blind spots or the problem of rekindling of the fire.

[0004] Therefore, in order to improve the applicability of the range hood fire extinguishing system, we propose a range hood capable of automatically detecting and extinguishing fires. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantages in the prior art that in the process of extinguishing a fire, it is impossible to effectively block fire and seal smoke. Therefore, during the fire extinguishing process, smoke and fire may still spread, affecting the fire extinguishing effect, etc., and to propose a range hood capable of automatically detecting and extinguishing fires.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] Design a range hood capable of automatically detecting and extinguishing fires, including:

[0008] A body with sensors installed inside, and at least one frame unit installed at the bottom opening of the body;

[0009] The bottom of the frame unit has a water curtain spraying area;

[0010] The bottom of the frame unit is rotatably connected with a plurality of nozzle units. The plurality of nozzle units are sequentially driven by a transmission assembly, and a scanning fire extinguishing area is formed between the plurality of nozzle units.

[0011] Further, the nozzle unit includes a pipe fitting rotatably connected to the bottom of the frame unit through a bracket. A plug column is arranged inside the pipe fitting. One end of the plug column is fixedly connected with a fixed shaft penetrating to the outer end of the pipe fitting, and the fixed shaft is fixed to the lower side of the frame unit;

[0012] Among them, a diversion opening is provided on the outer periphery of the plug column, and a plurality of nozzle assemblies are installed on the outer side of the pipe fitting.

[0013] Further, the nozzle units are distributed in a rectangular structure and there are four of them;

[0014] The transmission assembly includes bevel gears fixed to the ends of the pipe fittings. Adjacent pipe fittings are driven by bevel gears. A motor is also fixedly installed on the bracket of one of the pipe fittings, and the shaft end of the motor is fixedly connected to the adjacent pipe fitting.

[0015] Further, several of the nozzle assemblies are symmetrically arranged in two groups along the outer side of the pipe fitting;

[0016] The nozzle assembly includes a fixing ring fixedly connected to the outer side of the pipe fitting. Three wing plates are fixedly installed on the outer periphery of the fixing ring. A nozzle is rotatably connected to the end face of the wing plate. The nozzle is communicated to the inside of the pipe fitting through a hose. The spraying angles of multiple nozzles in the same group are changed by a driving assembly.

[0017] Further, the driving assembly includes a connecting plate fixed to the end face of the nozzle. A straight slot is provided on the end face of the connecting plate;

[0018] A guiding ring frame is fixedly installed on the outer side of the pipe fitting. Three driving rods are slidably connected to the outer side of the guiding ring frame. A driving pin is fixedly installed on the end face of the driving rod, and the driving pin slides inside the straight slot.

[0019] Further, the driving assembly further includes;

[0020] A T-shaped ring fixedly installed on the bracket. The T-shaped ring is sleeved on the outer side of the pipe fitting. A cam surface is formed on the inner side surface of the T-shaped ring. The end of the driving rod has a bent section, and the bent section slides along the cam surface;

[0021] A return spring is fixedly connected between the driving rod and the guiding ring frame.

[0022] Further, when the four pipe fittings rotate, the spraying angles of the nozzles are adjusted through the driving assembly to form the scanned fire extinguishing area.

[0023] Further, the frame unit includes a base plate, an upper shell and a lower shell;

[0024] A smoke exhaust cavity is formed between the upper shell and the base plate. A smoke suction hole is provided on the side of the upper shell;

[0025] A water cavity is formed between the lower shell and the base plate. A plurality of spray holes are annularly distributed at the bottom of the lower shell. The plurality of annular spray holes form the water curtain spraying area.

[0026] Further, a plurality of fire baffle plates are fixedly installed at the upper end of the substrate, and the plurality of fire baffle plates are symmetrically distributed on both sides of the smoking holes;

[0027] Among them, the plurality of fire baffle plates are staggered, and an opening is formed between one end and the inner wall of the upper shell.

[0028] Further, a heat conducting plate is embedded at the lower end of the substrate, and at least a part of the heat conducting plate extends into the interior of the water chamber.

[0029] An oil fume extractor capable of automatically detecting and extinguishing fires proposed by the present invention has the beneficial effects that: in the present invention, by installing a frame unit in the bottom opening of the oil fume extractor, the water curtain spraying area of the frame unit is used to achieve fire blocking and smoke sealing operations at the stove head. When a fire occurs, a water curtain is formed in the water curtain spraying area for protection. Secondly, through the set rotary nozzle assembly, a step-by-step scanning and extinguishing action is carried out on the ignition position of the cooking appliance. During the reciprocating rotation process, a continuous step-by-step and multiple extinguishing operations from the outside to the inside can be formed on the cooking appliance, effectively avoiding the occurrence of fire extinguishing blind spots and the reignition of the fire, and greatly improving the fire extinguishing effect and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the front view of the present invention;

[0031] Figure 2 is the three-dimensional view of the frame unit of the present invention Figure 1 ;

[0032] Figure 3 is the three-dimensional view of the frame unit of the present invention Figure 2 ;

[0033] Figure 4 is the structural schematic diagram of the transmission component of the present invention;

[0034] Figure 5 is the structural schematic diagram of the nozzle unit of the present invention;

[0035] Figure 6 is the cross-sectional view of the nozzle unit of the present invention;

[0036] Figure 7 is the structural schematic diagram of the pipe fitting of the present invention;

[0037] Figure 8 is Figure 7 the enlarged structural schematic diagram of area A;

[0038] Figure 9 is the structural schematic diagram of the cam surface of the present invention;

[0039] Figure 10 is the structural schematic diagram of the nozzle assembly of the present invention;

[0040] Figure 11 Exploded view of the frame unit of the present invention;

[0041] Figure 12 Cross-sectional view of the frame unit of the present invention;

[0042] Figure 13 Schematic diagram of the state when the smoke exhaust cavity of the present invention exhausts smoke;

[0043] Figure 14 Schematic diagram of the state of the water curtain spraying area and the scanning fire extinguishing area of the present invention during fire extinguishing.

[0044] In the figure: 1, body; 11, sensor; 2, frame unit; 20, water curtain spraying area; 21, bracket; 22, substrate; 221, heat conducting plate; 23, upper shell; 24, lower shell; 25, smoke exhaust cavity; 26, smoke suction hole; 27, water cavity; 28, spray hole; 29, fire baffle; 3, spray head unit; 30, scanning fire extinguishing area; 31, pipe fitting; 32, plug column; 33, fixed shaft; 34, diversion opening; 35, spray head assembly; 351, fixed ring; 352, wing plate; 353, spray head; 354, hose; 36, drive assembly; 361, connecting plate; 362, slotted hole; 363, guide ring frame; 364, drive rod; 365, drive pin; 366, T-shaped ring; 367, cam surface; 368, bent section; 369, return spring; 30, scanning fire extinguishing area; 4, transmission assembly; 41, bevel gear; 42, motor; 5, cooking stove. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0046] Refer to Figure 1-14 One embodiment of the present invention discloses an oil fume machine capable of automatically detecting and extinguishing fires, which is mainly used to solve the problems that the current fire extinguishing structure of the oil fume machine cannot block fire and seal smoke during fire extinguishing, and at the same time, the spraying angle of the fire extinguishing medium is single, resulting in poor fire extinguishing effect;

[0047] Refer to Figure 1 、 Figure 14 , specifically, the oil fume machine includes a body 1 with a sensor 11 installed inside, and at least one frame unit 2 installed at the bottom opening of the body 1;

[0048] It should be noted that the sensor 11 described in the present invention is installed inside the body 1 to sense whether there is a fire occurring currently. The sensor 11 can be a flame sensor or a vision module. When a fire occurs, it can notify the range hood to work and further implement the fire extinguishing operation. In addition, considering that there are single-burner and multi-burner structures in the current cooktop 5, in this embodiment, a sensor 11 can be installed at the burner head of each cooktop 5 for separate detection;

[0049] Furthermore, the frame unit 2 in this embodiment can also be adaptively selected and installed according to the number of burner heads. In the illustration of this embodiment, the structure of a double-burner and two frame units 2 is taken as an example. Since the structures of the two frame units 2 are the same, in order not to cause redundancy, the structure of one frame unit 2 will be used for illustration in the following structures.

[0050] Refer to Figure 14 Specifically, the bottom of the frame unit 2 described in the present invention has a water curtain spraying area 20. In this embodiment, the water curtain spraying area 20 is set to implement the operations of fire blocking and smoke sealing at the burner head. When a fire occurs, a water curtain is formed in the water curtain spraying area 20 for protection;

[0051] Refer to Figure 2 、 Figure 3 、 Figure 4 , a plurality of nozzle units 3 are rotatably connected to the bottom of the frame unit 2. The plurality of nozzle units 3 are sequentially driven by a transmission assembly 4, and a scanning fire extinguishing area 30 is formed among the plurality of nozzle units 3. The scanning fire extinguishing area 30 is for extinguishing the fire on the cooktop 5. In this embodiment, the area of the scanning fire extinguishing area 30 is variable, and its specific principle will be described in detail later and will not be elaborated here.

[0052] Refer to Figure 5 、 Figure 6 , in some embodiments, the nozzle unit 3 described in the present invention includes a pipe fitting 31 rotatably connected to the bottom of the frame unit 2 through a bracket 21. Both ends of each pipe fitting 31 are connected to a bracket 21. Of course, the bracket 21 is fixed to the lower side of the frame unit 2. In addition, both ends of the pipe fitting 31 in this embodiment adopt a closed structure to avoid water leakage. A plug 32 is arranged inside the pipe fitting 31. One end of the plug 32 is fixedly connected to a fixed shaft 33 penetrating to the outer end of the pipe fitting 31, and the fixed shaft 33 is fixed to the lower side of the frame unit 2. In this embodiment, the fixed shaft 33 can be fixed to the bottom of the frame unit 2 through fasteners such as bolts. The purpose of fixing it is to prevent the plug 32 from rotating. Currently, a sealing ring and other waterproof structures can also be arranged at the rotation part between it and the pipe fitting 31. This method is a conventional means for those skilled in the art and will not be elaborated here;

[0053] Reference Figure 6 Among them, a diversion opening 34 is provided on the outer periphery of the plug column 32. In this embodiment, the angle of the diversion opening 34 is α. A plurality of nozzle assemblies 35 are installed on the outer side of the pipe fitting 31. It should be noted that the diversion opening 34 in this embodiment is for discharging the fire extinguishing medium outward.

[0054] Specifically, one end of the pipe fitting 31 in this embodiment can be connected to the fire extinguishing medium supply device through a rotary joint. The fire extinguishing medium can be water or a liquid fire extinguishing agent. The rotary joint is arranged at the position corresponding to the diversion opening 34. When the medium enters, it can flow inside the diversion opening 34 and finally spray out for fire extinguishing along the nozzle assembly 35.

[0055] Reference Figure 4 On the basis of the above embodiment, in the present invention, the nozzle units 3 are distributed in a rectangular structure with four.

[0056] The transmission assembly 4 includes bevel gears 41 fixed to the ends of the pipe fittings 31. Adjacent two pipe fittings 31 are driven by the bevel gears 41. A motor 42 is also fixedly installed on the bracket 21 of one of the pipe fittings 31. The shaft end of the motor 42 is fixedly connected to the adjacent pipe fitting 31. Specifically, when a fire occurs, one pipe fitting 31 can be driven to rotate by the motor 42. Since adjacent two pipe fittings 31 are meshed by the bevel gears 41, the four sequentially connected nozzle units 3 rotate synchronously. In this state, the pipe fitting 31 drives the nozzle assembly 35 to rotate to form a rotational fire extinguishing method. Of course, the nozzle assemblies 35 of the four nozzle units 3 form a rectangular fire extinguishing area.

[0057] Reference Figure 5 Specifically, if the nozzle assemblies 35 are symmetrically arranged in two groups along the outer side of the pipe fitting 31;

[0058] Reference Figure 7 、 Figure 8 、 Figure 10 The nozzle assembly 35 includes a fixing ring 351 fixedly connected to the outer side of the pipe fitting 31. Three wing plates 352 are fixedly installed on the outer periphery of the fixing ring 351. A nozzle 353 is rotatably connected to the end surface of the wing plate 352. The nozzle 353 is communicated with the inside of the pipe fitting 31 through a hose 354. The design of using the hose 354 is to adapt to the rotational displacement of the nozzle 353. Of course, a through hole should be provided inside the fixing ring 351. The through hole is communicated with the pipe fitting 31. The hose 354 is communicated with this through hole. The spraying angles of multiple nozzles 353 in the same group are changed by a driving assembly 36.

[0059] Specifically, in the present invention, the pipe fitting 31 drives a plurality of fixing rings 351 to rotate, so as to drive several spray heads 353 to rotate and spray. When the spray heads 353 on the same straight line move to the above-mentioned diversion opening 34, at this time, a passage is formed by the diversion opening 34, the fixing ring 351, the hose 354 and the spray head 353, and the spray head 353 starts to spray the fire extinguishing medium outward to extinguish the fire;

[0060] Refer to Figure 14 During the fire extinguishing process, a plurality of spray heads 353 on the same straight line form a plane water curtain, and the four spray head units 3 form four plane water curtains. The four initial states are in the vertical position, so a rectangular structure fire extinguishing area can be formed. As the spray heads 353 rotate, the rectangular structure fire extinguishing area gradually shrinks from the outside to the inside above the cooking stove 5 into a trapezoidal fire extinguishing area until the hose 354 deflects and separates from the diversion opening 34, and the spray heads 353 stop spraying to extinguish the fire, so as to achieve the fire extinguishing method of gradually scanning from the outside to the inside;

[0061] In addition, when the spray heads 353 on the same straight line rotate and deflect, several spray heads 353 on the next group of the same straight line continue to repeat the above actions to perform the step-by-step scanning fire extinguishing action again. In this way, continuous step-by-step and multiple fire extinguishing operations from the outside to the inside can be formed on the cooking stove 5, which can effectively prevent the rekindling of the fire and greatly improve the stability of fire extinguishing.

[0062] Refer to Figure 8 、 Figure 9 、 Figure 10 On the basis of the above embodiment, in the present invention, the driving component 36 includes a connecting plate 361 fixed on the end face of the spray head 353, and a slotted hole 362 is formed on the end face of the connecting plate 361;

[0063] A guiding ring frame 363 is fixedly installed on the outer side of the pipe fitting 31, and three driving rods 364 are slidably connected to the outer side of the guiding ring frame 363. A driving pin 365 is fixedly installed on the end face of the driving rod 364, and the driving pin 365 slides inside the slotted hole 362.

[0064] Specifically, in this embodiment, a group of spray head assemblies 35 on one pipe fitting 31 is taken as an example, and another structure is the same and adopts a symmetric design method, so as to ensure that the two groups of spray head assemblies 35 can form a control method of synchronously spraying obliquely towards the center on both sides;

[0065] In addition, in this embodiment, since the driving rod 364 is slidably connected to the outer side of the guiding ring frame 363, when the driving rod 364 moves horizontally, the spray head 353 will be driven to rotate through the driving pin 365 and the connecting plate 361, so as to control the spraying angle.

[0066] The purpose of adopting this angle control is to avoid the impact between the spraying surfaces of two adjacent nozzle units 3 during spraying. Those skilled in the art know that in this embodiment, four nozzle units 3 are distributed in a rectangular structure, and each nozzle unit 3 will form a planar water curtain during spraying. When the nozzle unit 3 rotates towards the central axis of the frame unit 2, the four planar water curtains will have side contacts, which will cause the mutual impact of the media to form a relatively thick fusion area. At the same time, it may also cause the problem of waste due to the outward spraying of the media after impact;

[0067] Therefore, in this embodiment, by designing the multiple nozzles 353 on each pipe fitting 31 to be rotatable, when it rotates for spraying and extinguishing fires, it can automatically adjust the edge closing according to the rotation angle. Since the nozzle assembly 35 is designed with a symmetric structure on both sides, the two sides of the entire planar water curtain can be synchronously closed inward, avoiding waste caused by the impact of the planar water curtain, and ensuring that the media is evenly sprayed on the fire center maximally, thus effectively improving the fire extinguishing ability.

[0068] Refer to Figure 8 、 Figure 9 , in some preferred embodiments, the drive assembly 36 in the present invention further includes;

[0069] A T-shaped ring 366 fixedly installed on the bracket 21, the T-shaped ring 366 is sleeved on the outer side of the pipe fitting 31, and a cam surface 367 is formed on the inner side surface of the T-shaped ring 366. One end of the drive rod 364 has a bent section 368, and the bent section 368 slides along the cam surface 367;

[0070] A return spring 369 is fixedly connected between the drive rod 364 and the guide ring frame 363.

[0071] During specific operation, when the pipe fitting 31 drives the nozzle 353 to rotate for spraying, at this time, the bent section 368 on the drive rod 364 rotates along the cam surface 367. When the bent section 368 gradually contacts the convex part of the cam surface 367, to pull the drive rod 364, the entire drive rod 364 will slowly move outward. At this time, the drive rod 364 will drive the nozzle 353 to rotate through the drive pin 365 and the connecting plate 361, so as to control the spraying angle. The convex part can be set as a slope. Of course, when the bent section 368 disengages from the cam surface 367, the drive rod 364 is pulled back by the return spring 369;

[0072] In addition, another group of multiple nozzle assemblies 35 adopt the same structure and will not be elaborated here.

[0073] Of course, as can be seen from the above analysis, when the four pipe fittings 31 in the present invention rotate, the spraying angle of the nozzle 353 is adjusted through the driving assembly 36 to form the scanning fire extinguishing area 30, and this fire extinguishing area is variable as the nozzle 353 rotates.

[0074] Referring to Figure 11 , Figure 12 , in some embodiments, the frame unit 2 in the present invention includes a substrate 22, an upper shell 23, and a lower shell 24, and the substrate 22, the upper shell 23, and the lower shell 24 are fixedly connected in sequence;

[0075] A smoke exhaust cavity 25 is formed between the upper shell 23 and the substrate 22, and a smoke suction hole 26 is formed on the side of the upper shell 23. Of course, an interface should also be installed on the upper shell 23 to connect an external smoking device through this interface. Since the range hood stops working during a fire to protect the internal components, considering the need to exhaust the smoke during combustion, in this embodiment, a smoke exhaust cavity 25 is designed between the upper shell 23 and the substrate 22. During fire extinguishing, an external temporary smoking device can be connected to the upper shell 23. At this time, the burning smoke enters the interior of the smoke exhaust cavity 25 along the smoke suction hole 26, and then is discharged outward through the interface and pipeline on the upper shell 23, so as to reduce the amount of smoke during fire extinguishing and optimize the fire extinguishing operation environment;

[0076] Referring to Figure 13 , considering that during a fire, in addition to smoke, flames may also be sucked into the interior of the smoke exhaust cavity 25, to avoid damage to the external smoking device, in this embodiment, a plurality of fire baffle plates 29 are fixedly installed at the upper end of the substrate 22, and the plurality of fire baffle plates 29 are symmetrically distributed on both sides of the smoke suction hole 26;

[0077] Among them, the plurality of fire baffle plates 29 are arranged in a staggered manner, and an opening is formed between one end and the inner wall of the upper shell 23. The smoke exhaust channel is formed through the arranged opening. Of course, the interface on the upper shell 23 in the present invention is arranged on the side away from the smoke suction hole 26.

[0078] That is, in this embodiment, by arranging a plurality of fire baffle plates 29 above the substrate 22 to block the flames, the flames can be prevented from entering the external smoking device, so as to improve the overall durability.

[0079] In a further embodiment, a water cavity 27 is formed between the lower shell 24 and the substrate 22, and a plurality of spray holes 28 are annularly distributed at the bottom of the lower shell 24. The annular plurality of spray holes 28 form the water curtain spraying area 20.

[0080] In addition, a heat conducting plate 221 is embedded at the lower end of the substrate 22. The heat conducting plate 221 can be set as a copper plate. Preferably, a plurality of fin structures can also be arranged at the bottom of the heat conducting plate 221 to increase the heat exchange area. At least part of the heat conducting plate 221 extends into the interior of the water cavity 27. That is, in this embodiment, the heat conducting plate 221 is provided to enhance the heat exchange capacity between the water cavity 27 and the smoke exhaust cavity 25. When an external water source is introduced into the water cavity 27, heat exchange can be carried out with the smoke in the smoke exhaust cavity 25 to ensure that the exhausted smoke is in a low temperature state, thereby realizing further protection for the external smoking device.

[0081] In summary, in the present invention, by installing the frame unit 2 in the bottom opening of the range hood, the water curtain spraying area 20 of the frame unit 2 is used to block fire and seal smoke at the stove head. When a fire breaks out, a water curtain is formed in the water curtain spraying area 20 for protection. Secondly, the rotary nozzle assembly 35 is provided to gradually scan and extinguish the fire at the ignition position of the stove 5. During the reciprocating rotation process, a continuous step-by-step and multiple fire extinguishing operations from the outside to the inside can be formed on the stove 5, effectively avoiding the occurrence of fire extinguishing blind spots and reignition of the fire, and greatly improving the fire extinguishing effect and stability.

[0082] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. An oil fume machine capable of automatically detecting and extinguishing fires, characterized in that, Comprising: A body (1) internally installed with a sensor (11), and at least one frame unit (2) installed at the bottom opening of the body (1); The bottom of the frame unit (2) has a water curtain spraying area (20); A plurality of nozzle units (3) are rotatably connected to the bottom of the frame unit (2), and the plurality of nozzle units (3) are sequentially driven by a transmission assembly (4) therebetween, and a scanning fire extinguishing area (30) is formed among the plurality of nozzle units (3).

2. The range hood capable of automatically detecting and extinguishing fire according to claim 1, wherein: The nozzle unit (3) includes a pipe fitting (31) rotatably connected to the bottom of the frame unit (2) through a bracket (21), a plug column (32) is arranged inside the pipe fitting (31), one end of the plug column (32) is fixedly connected to a fixed shaft (33) penetrating to the outer end of the pipe fitting (31), and the fixed shaft (33) is fixed to the lower side of the frame unit (2); Wherein, a diversion opening (34) is formed on the outer periphery of the plug column (32), and a plurality of nozzle assemblies (35) are installed on the outer side of the pipe fitting (31).

3. The range hood capable of automatically detecting and extinguishing fire according to claim 2, wherein: The nozzle units (3) are distributed in a rectangular structure and there are four of them; The transmission assembly (4) includes bevel gears (41) fixed to the ends of the pipe fittings (31), and adjacent two pipe fittings (31) are driven by the bevel gears (41). A motor (42) is also fixedly installed on the bracket (21) of one of the pipe fittings (31), and the shaft end of the motor (42) is fixedly connected to the adjacent pipe fitting (31).

4. The range hood capable of automatically detecting and extinguishing fires according to claim 2, wherein: A plurality of the nozzle assemblies (35) are symmetrically arranged in two groups along the outer side of the pipe fitting (31); The nozzle assembly (35) includes a fixing ring (351) fixedly connected to the outer side of the pipe fitting (31), three wing plates (352) are fixedly installed on the outer periphery of the fixing ring (351), a nozzle (353) is rotatably connected to the end surface of the wing plate (352), the nozzle (353) is communicated with the inside of the pipe fitting (31) through a hose (354), and the spraying angles between the nozzles (353) in the same group are changed by a driving assembly (36).

5. The range hood capable of automatically detecting and extinguishing fire according to claim 4, wherein: The driving assembly (36) includes a connecting plate (361) fixed to the end surface of the nozzle (353), and a straight slot (362) is formed on the end surface of the connecting plate (361); A guiding ring frame (363) is fixedly installed on the outer side of the pipe fitting (31), three driving rods (364) are slidably connected to the outer side of the guiding ring frame (363), and a driving pin (365) is fixedly installed on the end surface of the driving rod (364), and the driving pin (365) slides inside the straight slot (362).

6. The range hood capable of automatically detecting and extinguishing fire according to claim 5, wherein: The driving assembly (36) further includes; A T-shaped ring (366) fixedly installed on the bracket (21), the T-shaped ring (366) is sleeved on the outer side of the pipe fitting (31), a cam surface (367) is formed on the inner side surface of the T-shaped ring (366), and a bent section (368) is formed at the end of the driving rod (364), and the bent section (368) slides in contact with the cam surface (367); A return spring (369) is fixedly connected between the drive rod (364) and the guide ring frame (363).

7. The oil fume purifier capable of automatic detection and fire extinguishing according to claim 5, characterized in that: When the four pipe fittings (31) rotate, the spraying angle of the spray head (353) is adjusted through the drive assembly (36) to form the scanned fire extinguishing area (30).

8. The range hood capable of automatically detecting and extinguishing fire according to claim 1, characterized in that: The frame unit (2) includes a base plate (22), an upper shell (23) and a lower shell (24); A smoke exhaust cavity (25) is formed between the upper shell (23) and the base plate (22), and a smoke suction hole (26) is formed in the side of the upper shell (23); A water cavity (27) is formed between the lower shell (24) and the base plate (22), and a plurality of spray holes (28) are annularly distributed at the bottom of the lower shell (24), and the water curtain spraying area (20) is formed between the plurality of annular spray holes (28).

9. The range hood capable of automatically detecting and extinguishing fire according to claim 8, wherein: A plurality of fire baffle plates (29) are fixedly installed at the upper end of the base plate (22), and the plurality of fire baffle plates (29) are symmetrically distributed on both sides of the smoke suction hole (26); Among them, the plurality of fire baffle plates (29) are staggered, and an opening is formed between one end and the inner wall of the upper shell (23).

10. A range hood capable of automatically detecting and extinguishing fires according to claim 8, characterized in that: A heat conducting plate (221) is also embedded at the lower end of the base plate (22), and at least a part of the heat conducting plate (221) extends into the water cavity (27).

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