CN111156554A - Range hood and control method thereof - Google Patents

Range hood and control method thereof Download PDF

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Publication number
CN111156554A
CN111156554A CN202010024862.3A CN202010024862A CN111156554A CN 111156554 A CN111156554 A CN 111156554A CN 202010024862 A CN202010024862 A CN 202010024862A CN 111156554 A CN111156554 A CN 111156554A
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Prior art keywords
circuit
range hood
open fire
fire
open
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CN202010024862.3A
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CN111156554B (en
Inventor
杨伟刚
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Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/006—Fire prevention, containment or extinguishing specially adapted for particular objects or places for kitchens or stoves
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C31/00—Delivery of fire-extinguishing material
    • A62C31/02—Nozzles specially adapted for fire-extinguishing
    • A62C31/05—Nozzles specially adapted for fire-extinguishing with two or more outlets
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2057—Removing cooking fumes using a cleaning liquid

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)

Abstract

The invention discloses a range hood, which comprises an air inlet assembly and a spraying device capable of spraying fire extinguishing medium, wherein the air inlet assembly comprises a shell and an air inlet arranged on the shell, and is characterized in that: the range hood further comprises an open fire detection device which can detect open fire so as to control the spraying device, and the open fire detection device comprises an open fire detector at least arranged in the air inlet assembly. Also discloses a control method of the range hood. Compared with the prior art, the invention has the advantages that: the open fire detector is adopted to automatically detect the open fire, the position of the open fire can be accurately judged, the open fire detector has the characteristics of high precision and wide detection range, even if the open fire detector is far away from a fire point or the open fire detector has the open fire but the open fire detector can detect the open fire when the temperature is not high, the accurate fire extinguishing can be realized, and the efficiency and the safety are high.

Description

Range hood and control method thereof
Technical Field
The invention relates to an oil fume purification device, in particular to a range hood and a control method of the range hood.
Background
The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.
The top-suction type range hood adopts the oil smoke rising principle, generates a negative pressure area right above a cooking bench, sucks and exhausts naturally rising oil smoke generated during cooking, and has the advantages of fashionable and concise appearance, larger air volume, larger space suitability and capability of catching the oil smoke far away from the cooking bench. The side-suction type range hood has the advantages that the power source is close to the cooking bench, most of the oil smoke close to the cooking bench is absorbed in an arc form, the machine body is thin, and the head is not easy to touch during operation. The distance between the suction inlet of the low-suction range hood and the table top is 300-450 mm, and the distance between the top suction and the side suction is 650-750 mm, so that compared with other two range hoods, the suction inlet of the low-suction range hood is closer to the cooking bench, the negative pressure area is close to a smoke source, the moving path of the oil smoke is reduced, the temperature rise is faster and higher, and the oil smoke suction effect is good.
However, since the suction inlet of the low-suction range hood is closer to the pot and the kitchen range, generally between 300 mm and 350mm, when the deep-fried cooker is used for cooking with big fire, the oil-gas mixture in the pot is easy to generate open fire, and the open fire generated in the pot is easy to be sucked by the range hood, so that oil accumulation in the range hood and fire in a circuit are caused, and fire hazard exists. If no person is on site, the loss is immeasurable.
Some existing range hoods with fire extinguishing function, such as the kitchen automatic fire extinguishing device with partition control disclosed in chinese patent application No. 201610728111.3, have a temperature sensor, so that when a fire occurs, a fuse link of the temperature sensor is fused, and then a subsequent fire extinguishing action is triggered. This approach has the following disadvantages: (1) when the temperature sensor is far away from the fire source, open fire exists, but the temperature sensor cannot trigger the fire extinguishing system in time, and the risk that open fire exists but the fire extinguishing system and the alarm system are not triggered exists; (2) when a fire occurs, the fuse link of the temperature sensor is fused to start the fire extinguishing operation, and when the fire is extinguished, the fire extinguishing action cannot be judged to be finished, so that complete fire extinguishing cannot be ensured.
In addition, the range hood usually sprays the fire extinguishing material through a spraying device, and the existing spraying devices, such as a nozzle device and a method for atomizing fluid disclosed in chinese patent application No. 200580018979.4, a nozzle of a fixed-spraying sector disclosed in chinese patent application No. 201710649008.4, and a method for uniformly spraying fluid medium by using impeller rotation of a uniform water distribution and distribution diffusion nozzle disclosed in chinese patent application No. 201610692133.9, all of which have the principle that fluid flows through the front and back of a blade, and a pressure difference is formed between the front and back of the blade, so that the impeller starts to rotate under the action of the pressure difference, and the rotating impeller provides a centrifugal force to make the fluid flow out tangentially. There are the following disadvantages: (1) continuous fluid with certain viscosity, such as water, oil and the like, is needed, and if the fluid is air or foam, the impeller cannot rotate; (2) a flow guide structure must be arranged between the nozzle and the rotating impeller to ensure that fluid flows to the surface of the impeller first and certain requirements are imposed on the flow velocity of the fluid.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a range hood which can accurately and efficiently extinguish fire in order to solve the problems in the prior art.
The second technical problem to be solved by the present invention is to provide a control method for the above range hood.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a range hood, includes air inlet subassembly and can spray extinguishing medium's spray set, the air inlet subassembly includes the casing and sets up the air intake on the casing, its characterized in that: the range hood further comprises an open fire detection device which can detect open fire so as to control the spraying device, and the open fire detection device comprises an open fire detector at least arranged in the air inlet assembly.
Further, for spraying device sprays extinguishing medium, spraying device includes the holding vessel that can store extinguishing medium, can spray the shower head of the extinguishing medium that stores in the holding vessel, the shower head sets up with naked light detector corresponds, pass through pipe connection between holding vessel and the shower head.
Furthermore, the spray head comprises a spray head, the spray head is connected to the tail end of the guide pipe, the spray head comprises a spray head main body and a nozzle, and the nozzle is provided with a spray hole.
Furthermore, the spray head further comprises a rotary impeller and a support for supporting the rotary impeller, the rotary impeller is arranged opposite to the spray head, a nozzle of the spray head is arranged on one side of the spray head main body facing the rotary impeller, the rotary impeller comprises a rotary shaft and at least two blades arranged on the peripheral wall of the rotary shaft, and therefore the axial flow fan structure driven by air flow inside the range hood to rotate is formed, a flow guide structure is not needed to be arranged, the structure is simplified, the spray head can adapt to various media, the spray device can be used for self-cleaning of the range hood, and fire extinguishing media or cleaning media can be conveniently sprayed.
In order to spray the medium uniformly, the nozzle is in a spherical crown shape and protrudes in a direction far away from the spray head main body, and the spray holes are distributed in a radial shape.
Further, still including setting up the subassembly that induced drafts in air inlet subassembly top, the subassembly that induced drafts includes fan frame and the fan system of setting in the fan frame, open flame detector has two at least, sets up respectively in casing and fan frame.
In order to realize automatic fire extinguishing, the spraying device also comprises a valve which is arranged between the guide pipes and controls the connection or disconnection between the storage tank and the spraying head; the range hood also comprises a control circuit, the control circuit comprises a detection unit, a feedback circuit, a judgment circuit and an automatic fire extinguishing circuit, and each open fire detector forms a detection unit; the number of the feedback circuits is equal to that of the detection units, each detection unit is connected with the input end of the corresponding feedback circuit, the output end of each feedback circuit is connected with the input end of the judgment circuit, the output end of the judgment circuit is connected with the input end of the automatic fire extinguishing circuit, and the automatic fire extinguishing circuit is connected with the valve of the spraying device and can control the valve.
Furthermore, in order to improve the fire extinguishing efficiency and ensure the completion of fire extinguishing, the air inlet assembly further comprises a smoke baffle plate capable of opening or closing the air inlet, the control circuit further comprises a movement mechanism adjusting circuit for driving the smoke baffle plate and an automatic power-off circuit for controlling the range hood to be powered on or not, and the output end of the judgment circuit is also connected with the input ends of the movement mechanism adjusting circuit and the automatic power-off circuit respectively.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a control method of a range hood as described above, comprising the steps of:
1) the range hood starts to work, and the open flame detection device starts to work;
2) when the open fire detector in the shell detects open fire, the open fire in the air inlet assembly area is indicated, the control circuit controls the smoke baffle to be closed, and controls the automatic power-off circuit to enable the range hood to automatically cut off a working power supply;
3) each open fire detector detects the open fire again, if the open fire is not detected, the fire is judged to be extinguished, and the fire is extinguished; if open fire is detected, the judging circuit judges the position of the fire source according to the detection result of the open fire detector, and enables the spray header of the area where the fire source is located to start working, and the judgment is carried out for N times in a circulating mode until the open fire is not detected any more, and the fire is judged to be extinguished, so that the fire extinguishment is completed.
Preferably, in order to play a warning role, the control circuit further comprises an alarm device circuit, the output end of the judgment circuit is further connected to the alarm device circuit, in the steps 2) and 3), when any open fire detector detects open fire, the judgment circuit starts the alarm device circuit, and when all open fire detectors do not detect open fire, the judgment circuit controls the alarm device circuit to release the alarm.
Compared with the prior art, the invention has the advantages that: 1) the open fire detector is adopted to automatically detect the open fire, the position of the open fire can be accurately judged, and the device has the characteristics of high precision and wide detection range, can detect the open fire even if the open fire detector is far away from a fire point or the open fire exists but the temperature is not high, can accurately extinguish the fire, and is efficient and safe; 2) the smoke exhaust ventilator is distributed at different positions in the smoke exhaust ventilator, and can detect and extinguish fire in all directions; 3) the spraying device rotates by means of the air flow in the range hood, and is convenient to switch into a cleaning mode to remove oil stains in the range hood, when the spraying holes spray fire extinguishing media or cleaning media, the media are sprayed to the rotating impeller, and the fluid media flow in the axial direction and the radial direction under the centrifugal force of the rotating impeller, so that the uniform spraying of the fluid media can be ensured, and the effectiveness of fire extinguishing and cleaning is improved; 4) the air inlet can be closed in time, so that open fire is prevented from being sucked, and the fire behavior is further expanded; 5) when the first fire extinguishing action is not finished, the fire extinguishing action can be circularly triggered for infinite times until no open fire exists, so that the fire extinguishing action is further accurate, efficient and safe.
Drawings
FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a range hood in accordance with an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion I of FIG. 2;
FIG. 4 is a Pt-Q curve of a rotary impeller of a spraying device of a range hood according to an embodiment of the present invention;
FIG. 5 is a schematic view of the distribution of the inlet full pressure area of the range hood fan system according to the embodiment of the present invention;
fig. 6 is a schematic view of a spray head of a spray device of a range hood according to an embodiment of the present invention;
fig. 7 is a top view of a spray head of a spray device of a range hood according to an embodiment of the present invention;
FIG. 8 is a block diagram of a control circuit of the range hood according to the embodiment of the present invention;
fig. 9 is a control flowchart of the range hood according to the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Referring to fig. 1 to 3, a range hood, includes an air intake assembly 1 and an air suction assembly 2.
In this embodiment, the air intake assembly 1 includes a housing 11 and an air inlet 12 provided on the housing 11, an air intake channel 13 is formed in the housing 11, an upper end of the housing 11 is open, the air intake channel 13 is communicated with the outside through the air inlet 12, the air inlet 12 is provided at a lower portion of a front side of the housing 11, and a lower end of the air inlet 12 is preferably flush with a lower end of the housing 11, thereby forming the low-suction range hood. The housing 11 is flat, and here, flat means that the width in the front-rear direction is much smaller than the length (dimension in the left-right direction) and the height (dimension in the up-down direction) of the housing 11, so that the housing 11 has a sufficient operating space on the front side in the mounted state. A smoke baffle 14 is arranged at the front side of the housing 11 and at the air inlet 12, the smoke baffle 14 can rotatably open or close the air inlet 12, and the smoke baffle 14 can be driven to turn over by a common motion mechanism, such as an electric push rod, a motor and the like, and is matched with a connecting rod, a gear and the like.
The air suction assembly 2 is arranged above the air inlet assembly 1 and comprises a fan frame 21 and a fan system 22 arranged in the fan frame 21, and the lower end of the fan frame 21 is connected with the upper end of the shell 11 of the air inlet assembly 1. The dimension of the fan frame 21 in the front-rear direction is larger than that of the housing 11, the fan system 22 is arranged on the front side in the fan frame 21, and the portion of the fan frame 21 on the rear side of the fan system 22 is open at the lower end thereof so as to be connected to the upper end of the housing 11 and thus communicate with the air intake passage in the housing 11.
Open fire is generated in the pot during cooking, if the range hood operates at the moment, the open fire is sucked into the range hood due to the suction effect of the range hood, the range hood can be caused to self-ignite, and the range hood operates to generate combustion supporting effect on a fire source in the pot. Therefore, in the present application, the range hood further includes an open fire detection device and a spray device. In order to accurately detect the position of the open fire in the range hood, the open fire detector comprises three open fire detectors 31, and the principle of the open fire detectors 31 is to detect ultraviolet rays in flame to capture a fire source. One of the open fire detectors 31 is located in the housing 11 and above the air inlet 12, and can accurately detect the fire in the housing 11; the other open fire detector 31 is positioned in the fan frame 21 and at the rear side of the fan system 22, and can accurately detect the rear side of the range hood; the remaining open fire detector 31 is located in the fan frame 21 and at the front side of the fan system 22, and can accurately detect the front fire of the range hood. The three open fire detectors 31 can detect the fire source in the range hood in an all-around manner.
Alternatively, the open fire detectors 31 may be in other numbers or arranged at other positions in the range hood.
The spraying device comprises three spraying heads 41 corresponding to the three open fire detectors one by one and a storage tank 42 used for storing sprayed media, wherein one spraying head 41 corresponds to the open fire detector 31 in the shell 11 in position, the other spraying head 41 corresponds to the open fire detector 31 on the rear side of the fan frame 21 in position, and the rest spraying head 41 corresponds to the open fire detector 31 on the front side of the fan frame 21 in position. The spraying device further comprises four guide pipes 43 and valves 44 arranged between the guide pipes 43, wherein one end of one guide pipe 43 is connected with the storage tank 42, one end of each guide pipe 43 of the other three guide pipes 43 is respectively connected with one rotating spray head 41, and the other end of each guide pipe 43 is connected with the valve 44, so that the connection or disconnection between the storage tank 42 and the spray head 41 is controlled. The valve 44 is preferably a four-way solenoid valve.
Each shower head 41 includes a shower head 411, a rotary impeller 412, and a holder 413 supporting the rotary impeller 412. The nozzle 411 is connected to the end of the guide tube 43, the bracket 413 comprises a support 4131 arranged on the guide tube 43, a rotary bearing 4132, and a connecting rod 4133 connected between the support 4131 and the rotary bearing 4132, the nozzle 411 is positioned between the support 4131 and the rotary bearing 4132, the connecting rod 4133 has at least two, and the nozzle 411 is positioned in a space surrounded by the connecting rod 4133. The rotary impeller 412 includes a rotary shaft 4121 and at least two blades 4122 provided on a peripheral wall of the rotary shaft 4121, thereby constituting the structure of the axial flow fan. The rotary shaft 4121 is rotatably connected to the rotary bearing 4132, and the rotary shaft 4121 extends from the connection with the rotary bearing 4132 toward the head 411.
The storage tank 42 can store a fire extinguishing medium or a cleaning medium, so that the sprinkler can perform both a fire extinguishing function and a cleaning function. When the range hood enters the cleaning mode, the naked flame detection device does not work, and the spraying device can spray water or spray cleaning liquid for cleaning, so that the interior of the range hood is thoroughly cleaned.
In the present embodiment, the rotating impeller 412 adopts the existing equivalent-ring-quantity design method, assuming that the pressure rise along the radial direction of the blades 4122 is constant, Pt on each meridian plane is constant, the axial speed of the airflow in the radial direction of the blades on each meridian plane is constant, the blades 4122 are airfoil-shaped, preferably, the airfoil-shaped rotating LS airfoil-shaped, and the number of the blades 4122 is 3-5.
Referring to FIG. 4, Pt-m is the minimum full pressure for which the blades 4122 of the rotating impeller 412 rotate without stalling. Referring to fig. 5, the inlet full pressure distribution when the air volume of the range hood is 9m3/min, it is known from the figure that the full pressure difference Δ p (between lines a and B) in the inlet region is (15-36) Pa, and the pressure difference when the range hood works can drive the rotary impeller 412 to rotate as long as the rotary impeller 412 is designed to be Pt-m < Δ p (different air volumes, the fan system 22 and the application environment are different, but there are Pt-m less than Δ p).
Referring to fig. 6 and 7, nozzle 411 includes a nozzle body 4111, a nozzle 4112, and a neck 4113, wherein the neck 4113 is located between the nozzle body 4111 and the nozzle 4112, the nozzle 4112 is disposed on a side of the nozzle body 4111 facing the rotating impeller 412, the nozzle 4112 is in a spherical shape and protrudes toward the rotating impeller 412, a plurality of nozzle holes 4114 are formed in the nozzle 4112, and the plurality of nozzle holes 4114 may be uniformly distributed on the nozzle 4112. The combination of the nozzles 4112 and the spray holes 4114 ensures that the medium is uniformly sprayed in multiple directions, and the medium is uniformly sprayed under the action of centrifugal force of the rotating impeller 412, so that the structure is simple and the effect is good. In this embodiment, preferably, in order to better ensure the multi-directional uniform injection of the medium, the centers of the injection holes 4114 in the middle form a circle, and the injection holes 4114 are arranged radially outward at intervals with the injection holes 4114 which form the circle in the middle as a starting point, so that the injection holes 4114 on the nozzle 4112 are distributed radially. Wherein, the nozzle 4112 of the nozzle 411 in the air intake component 1 faces upward, and the nozzle 4112 of the nozzle 411 in the air suction component 2 faces downward.
A neck portion 4113 is formed on the side of the nozzle 4112 away from the rotating impeller 412 of the nozzle 411, and the circumferential surface of the neck portion 4113 forms an inwardly concave arc surface. Preferably, height H of neck 4113235-50 mm, diameter D of circle formed by middle spray hole 41141About 50 ~ 80mm, shower nozzle main part 4111 is cylindrical, and its diameter D250-70 mm, radius R of nozzle 41123107-123 mm, diameter D of spray hole 411445-8 mm, the diameter D of the connection between the nozzle 4112 and the neck 411357.5-11 mm, the radius of the cambered surface of the neck 4113 is R2The distance between the centers of every two radially adjacent spray holes 4114 is H, wherein the distance is 40-50 mm17.5 ~ 9mm, the distance between the edge of shower nozzle 411 that is located one side far away from neck 4113 and nozzle 4112 and the centre of a circle of the cambered surface of neck 4113 is H3The distance between the center of the neck portion 4113 and the edge of the nozzle 4112 is 48-52 mm, and the distance between the center and the edge of the nozzle 411 is H4＝D2/2. Limited size
Figure BDA0002362083580000061
Perforation rate of the surface of the nozzle 411
Figure BDA0002362083580000062
In this embodiment, preferably, H2＝35mm，D1＝80mm，D2＝50mm，R3＝107mm，D4＝5mm，D5＝7.5mm，R2＝48mm，H1＝7.5mm，H3＝48mm，H4＝D2/2。φ＝1.6，
Figure BDA0002362083580000063
The shower head 41 has the following advantages: (1) there is not any diversion structure between the rotating impeller 412 and the spray nozzle 411, when the range hood starts, the interior of the range hood cavity starts to flow under the action of the fan system 22, at this time, there is a pressure difference in the range hood cavity, the rotating impeller 412 starts to rotate under the action of the pressure difference, there is no need to spray a medium to provide power for it, the fluid medium is sprayed onto the rotating impeller 412, the fluid medium is subjected to axial conveying force and radial centrifugal force on the rotating impeller 412, the fluid medium is uniformly conveyed into the range hood flow channel, and the fire extinguishing and cleaning actions are completed; (2) the nozzles 4112 and orifices 4114 of the nozzle 411 ensure multi-directional uniform spraying of the medium, and uniform spraying of the medium is ensured under the centrifugal force action of the rotating impeller 412. The structure is simple and the effect is good; (3) the medium of the spraying device can be low-viscosity flowing medium, non-continuous medium carbon dioxide, high-viscosity medium water, cleaning agent and the like.
Referring to fig. 8, in order to control the actions of the smoke barrier 14 and the spraying device by receiving the signal of the open fire detection device, the application further includes a control circuit including a first detection unit, a second detection unit, a third detection unit, a feedback circuit and a judgment circuit 52. The first detection unit is an open fire detector 31 arranged in the air intake assembly 1, the second detection unit is an open fire detector 31 arranged at the rear side in the fan frame 21, and the third detection unit is an open fire detector 31 arranged at the front side in the fan frame 21. The feedback circuit comprises a first feedback circuit 511, a second feedback circuit 512 and a third feedback circuit 513, wherein a first detection unit is connected with an input end of the first feedback circuit 511, a second detection unit is connected with an input end of the second feedback circuit 512, and a third detection unit is connected with an input end of the third feedback circuit 513. The output terminals of the three feedback circuits are respectively connected to the input terminal of the judgment circuit 52. The control circuit also comprises an alarm device circuit 53, an automatic fire extinguishing circuit 54, a movement mechanism adjusting circuit 55 and an automatic power-off circuit 56, wherein the movement mechanism adjusting circuit 55 and the automatic power-off circuit 56 drive the smoke baffle 14, and the output end of the judging circuit 52 is respectively connected with the input ends of the alarm device circuit 53, the automatic fire extinguishing circuit 54, the movement mechanism adjusting circuit 55 and the automatic power-off circuit 56. The automatic fire extinguishing circuit 54 is connected with the valve 44 of the spraying device, and the movement mechanism adjusting circuit 55 controls the opening and closing of the smoke baffle plate 14 of the range hood. The connections in the control circuit are all electrically connected. The range hood may be provided with an alarm device (not shown), such as a buzzer or the like, controlled by the alarm device circuit 53, and the alarm device may be activated by the alarm device circuit 53 when a fire occurs. The automatic power-off circuit 56 is connected with a power line of the range hood and can control whether the range hood is connected with a power supply or not. The judgment circuit 52 is a logic circuit and functions as a circuit for performing a logic operation.
Referring to fig. 9, when the user needs to wash, the user can directly enter the washing mode, and the three spraying heads 411 work simultaneously and continuously for a period of time, such as 2min, and the washing mode is ended. Before entering the cleaning mode, the user needs to replace the medium in the storage tank 42, replace the extinguishing medium with cleaning medium, or directly replace the storage tank 42.
Fig. 9 also shows the control flow of the range hood when extinguishing a fire, which includes the following steps:
1) the range hood starts to work, and the open flame detection device (three open flame detectors 31 are respectively used as a first detection unit, a second detection unit and a third detection unit) starts to work;
2) when the open fire detector 31 in the shell 11 detects open fire, the open fire in the area of the air inlet component 1 is indicated, the control circuit judges, the smoke baffle plate 14 is controlled to be closed, the range hood is prevented from further sucking the fire source in the cooker, the alarm device circuit 53 starts to work (any open fire detector 31 detects that the fire source is opened), the alarm device is started to alarm, and the range hood automatically cuts off the working power supply through the automatic power-off circuit 56;
3) the control circuit works circularly, the three open fire detectors 31 detect the open fire again, if the open fire is not detected, the fire is judged to be extinguished, the alarm device circuit 53 releases the alarm, and the fire is extinguished; if an open fire is detected, the determination circuit 52 determines the position of the fire source based on the detection result of the open fire detector 31:
3.1) if the air inlet component 1 is on fire in the area, the judging circuit 52 receives the signal of the open fire detector 31 (first detecting unit) in the area, controls the valve 44 to enable the storage tank 42 to be communicated with the spray header 41 in the shell 11, so that the spray header 41 of the spray device in the shell 11 starts to work, and performs N times of judgment in a circulating mode until the open fire is no longer detected, the judgment is that the fire is extinguished, and the alarm device circuit 53 releases the alarm to finish extinguishing the fire;
3.2) if the rear area in the fan frame 21 catches fire, the judging circuit 52 receives the signal of the open fire detector 31 (second detecting unit) in the area, controls the valve 44 to enable the storage tank 42 to be communicated with the spray header 41 at the rear side in the fan frame 21, so that the spray header 41 of the spray device at the rear side in the fan frame 21 starts to work, and performs judgment for N times in a circulating mode until the open fire is no longer detected, the fire is judged to be extinguished, and the alarm device circuit 53 releases the alarm to finish extinguishing the fire;
3.3) if the front area of the fan frame 21 catches fire, the judging circuit 52 controls the valve 44, so that the spray header 41 of the spray device positioned at the front side in the fan frame 21 starts to work, and the judgment is circulated for N times until the fire is extinguished, and the alarm device circuit 53 releases the alarm to finish the extinguishing of the fire.
When the open fire detectors 31 are disposed at other positions or the number is not 3, the detection and control principle thereof is similar to the above.
The circuits of the spraying device and the alarm device are provided with independent power supply systems, and when the circuit of the range hood is protected and powered off, the power supply circuits of the range hood work normally. Preferably, the fire extinguishing medium in the storage tank 42 is a carbon dioxide foam fire extinguishing agent and the cleaning medium is a fume cleaning agent.
The open fire detection device and the spraying device can also be used in other types of range hoods, such as side-draft range hoods.

Claims (10)

1. The utility model provides a range hood, includes air inlet subassembly (1) and can spray extinguishing medium's spray set, air inlet subassembly (1) includes casing (11) and sets up air intake (12) on casing (11), its characterized in that: the range hood further comprises an open fire detection device which can detect open fire so as to control the spraying device, and the open fire detection device comprises an open fire detector (31) at least arranged in the air inlet assembly (1).
2. The range hood of claim 1, wherein: the spraying device comprises a storage tank (42) capable of storing fire extinguishing media and a spraying head (41) capable of spraying the fire extinguishing media stored in the storage tank (42), the spraying head (41) is arranged corresponding to the open fire detector (31), and the storage tank (42) is connected with the spraying head (41) through a conduit (43).
3. The range hood of claim 2, wherein: shower head (41) include shower nozzle (411), the end at pipe (43) is connected in shower nozzle (411), shower nozzle (411) include shower nozzle main part (4111) and nozzle (4112), orifice (4114) have been seted up on nozzle (4112).
4. The range hood of claim 3, wherein: the spray head (41) further comprises a rotating impeller (412) and a support (413) for supporting the rotating impeller (412), the rotating impeller (412) and the spray head (411) are arranged oppositely, a nozzle (4112) of the spray head (411) is arranged on one side, facing the rotating impeller (412), of the spray head main body (4111), and the rotating impeller (412) comprises a rotating shaft (4121) and at least two blades (4122) arranged on the peripheral wall of the rotating shaft (4121), so that an axial flow fan structure driven to rotate by airflow inside the range hood is formed.
5. The range hood of claim 3, wherein: the nozzle (4112) is in a spherical crown shape and protrudes in a direction far away from the spray head main body (4111), and the spray holes (4114) are distributed in a radial shape.
6. The range hood of claim 2, wherein: still including setting up subassembly (2) that induced drafts in air inlet subassembly (1) top, induced draft subassembly (2) include fan frame (21) and set up fan system (22) in fan frame (21), naked light detector (31) have at least two, set up respectively in casing (11) and fan frame (21).
7. The range hood of claim 6, wherein: the spraying device also comprises a valve (44) which is arranged between the guide pipes (43) and controls the connection or disconnection between the storage tank (42) and the spraying head (41); the range hood also comprises a control circuit, the control circuit comprises a detection unit, a feedback circuit, a judgment circuit (52) and an automatic fire extinguishing circuit (54), and each open fire detector (31) forms a detection unit; the number of the feedback circuits is equal to that of the detection units, each detection unit is connected with the input end of the corresponding feedback circuit, the output end of each feedback circuit is connected with the input end of the judgment circuit (52), the output end of the judgment circuit (52) is connected with the input end of the automatic fire extinguishing circuit (54), and the automatic fire extinguishing circuit (54) is connected with the valve (44) of the spraying device and can control the valve (44).
8. The range hood of claim 7, wherein: the air inlet assembly (1) further comprises a smoke baffle (14) capable of opening or closing the air inlet (12), the control circuit further comprises a movement mechanism adjusting circuit (55) for driving the smoke baffle (14) and an automatic power-off circuit (56) for controlling the range hood to be powered on or not, and the output end of the judging circuit (52) is further connected with the input ends of the movement mechanism adjusting circuit (55) and the automatic power-off circuit (56) respectively.
9. A control method of a range hood according to claim 8, comprising the steps of:
1) the range hood starts to work, and the open flame detection device starts to work;
2) when an open fire detector (31) positioned in the shell (11) detects an open fire, the open fire in the area of the air inlet assembly (1) is indicated, the control circuit controls the smoke baffle plate (14) to be closed, and controls the automatic power-off circuit (56) to enable the range hood to automatically cut off a working power supply;
3) each open fire detector (31) detects the open fire again, if the open fire is not detected, the fire is judged to be extinguished, and the fire is extinguished; if open fire is detected, the judging circuit (52) judges the position of the fire source according to the detection result of the open fire detector (31), and enables the spray header (41) of the area where the fire source is located to start working, and the judgment is carried out for N times in a circulating mode until the open fire is not detected any more, and the fire is judged to be extinguished, so that the fire extinguishment is completed.
10. The control method of the range hood according to claim 9, characterized in that: the control circuit further comprises an alarm device circuit (53), the output end of the judgment circuit (52) is further connected to the alarm device circuit (53), in the steps 2) and 3), when any open fire detector (31) detects open fire, the judgment circuit (52) starts the alarm device circuit (53), and when all open fire detectors (31) do not detect open fire, the judgment circuit (52) controls the alarm device circuit (53) to alarm.
CN202010024862.3A 2020-01-10 2020-01-10 Range hood and control method thereof Active CN111156554B (en)

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CN204786666U (en) * 2015-06-18 2015-11-18 绍兴板川电器有限公司 Prevent integrated kitchen of burning explosion
CN208810651U (en) * 2018-04-15 2019-05-03 西可林控制***(上海)有限公司 For cleaning the flusher of wire coiling inner ring
CN110594814A (en) * 2019-09-05 2019-12-20 宁波方太厨具有限公司 Fume exhaust fan

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Publication number Priority date Publication date Assignee Title
CN2634340Y (en) * 2003-05-28 2004-08-18 傅建国 Wind wheel type kitchen fume purifier
US20110048397A1 (en) * 2006-03-10 2011-03-03 Kellogg, Bruns & Smeija, LLC Range exhaust cleaning system and method
CN102062430A (en) * 2011-01-25 2011-05-18 吴小国 Safety protection type circulating oil filtration environmental friendly integrated stove
CN102913969A (en) * 2012-09-27 2013-02-06 杭州九龙厨具制造有限公司 Kitchen purging system and fire extinguishing method thereof
CN203990990U (en) * 2014-06-21 2014-12-10 张从桢 A kind of rotation insufflation showerhead of the sector of surely spraying
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CN115350431B (en) * 2022-06-30 2023-09-26 浙江嘉宝节能技术股份有限公司 Second fire extinguishing method for setting machine

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