CN111076257B

CN111076257B - Fume exhaust fan

Info

Publication number: CN111076257B
Application number: CN202010024861.9A
Authority: CN
Inventors: 杨伟刚
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2021-10-22
Anticipated expiration: 2040-01-10
Also published as: CN111076257A

Abstract

The invention discloses a range hood, which comprises an air inlet assembly, a smoke baffle assembly and a cooling device for cooling the smoke baffle assembly, wherein the air inlet assembly comprises a shell and an air inlet arranged on the front side of the shell, the smoke baffle assembly is arranged on the front side of the shell and corresponds to the air inlet, and the range hood is characterized in that: keep off the cigarette board subassembly and be cavity, the heat sink includes inhales the inside fan that keeps off the cigarette board subassembly and discharge, thereby take away the heat of keeping off the cigarette board subassembly with the outside air that is used for the cooling of range hood. Compared with the prior art, the invention has the advantages that: 1) the hollow smoke baffle plate assembly is cooled in an air cooling mode, so that the size is small, the heat dissipation efficiency is high, the temperature of the smoke baffle plate assembly is reduced, a user and objects placed above the smoke baffle plate assembly are prevented from being scalded, the oil and fat separation degree is improved, and the oil and smoke absorption effect is improved; 2) through designing solitary heat dissipation wind channel, can in time get rid of the heat, through temperature sensor's feedback, can make and keep keeping in lower temperature throughout the cigarette board subassembly.

Description

Fume exhaust fan

Technical Field

The invention relates to an oil fume purification device, in particular to a 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-draft 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, and the side-draft range hood is thin in body and is not easy to touch the head 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, too fast and high a temperature rise can cause the following: 1) the temperature of the smoke baffle is too high, so that a user is easily scalded, and the viscose of the glass panel falls off; 2) when the smoke baffle plate is used as a storage rack, the surface of the smoke baffle plate with too high temperature is easy to damage articles; 3) because the smoke baffle is a flat plate, the following defects exist: although the suction inlet is closer to the smoke source, the area of the negative pressure area at the inlet of the range hood is small, and the oil smoke at first glance easily escapes from the edge of the smoke baffle plate in the cooking state of lifting the pot and the high pot; the oil-fat separation degree is insufficient, the oil-smoke volume entering the fan system is increased, the oil-smoke is accumulated on the surfaces of the volute and the impeller, and the normal operation time of the range hood is shortened; the adhesion of condensed oil drops and water drops on the surface of the smoke baffle plate is small, so that oil and water drops easily drop into the pot during cooking.

In order to avoid the over-high temperature rise of the smoke baffle, the existing range hood adopts some cooling means to reduce the temperature of the smoke baffle. The integrated kitchen of formula of inhaling that chinese patent application number is 201220067979.0 discloses sets up a heat insulating board in the middle of integrated kitchen entry and gas-cooker, plays the effect of isolated cooking utensils flame and range hood inlet scoop, makes the cooking utensils burning more stable, and the flue gas that the inlet scoop flows has the cooling effect to the heat insulating board, but the heat insulating board is placed in the centre of cooking utensils flame and range hood inlet scoop, has following shortcoming: (1) the negative pressure distribution at the inlet of the range hood changes, which affects the oil smoke absorption effect; (2) the flue gas of range hood inlet scoop has certain temperature, can not reach the effect that reduces the heat insulating board temperature, has scalded user's risk.

Also, as disclosed in chinese patent application No. 201821335059.6, a cavity exists between the smoke barrier and the cooling assembly, i.e., the cooling assembly (water cooling) and the smoke barrier do not directly contact each other, but exchange heat through the air in the cavity. This approach has the following disadvantages: (1) the smoke baffle plate always needs to keep a lower temperature, cold water needs to be continuously communicated, namely, heat is taken away by cold water in a circulating mode, so that an extra water path is needed, the installation is complicated, the cavity is too large, the cavity is not a closed space, the heat exchange is poor, and the water cooling effect is poor; (2) the surface of the smoke baffle plate is provided with a deep groove structure, and grease is accumulated on the surface of the smoke baffle plate and is difficult to clean.

Also, as disclosed in chinese patent No. 201710703360.1, a clean range hood is provided with a semiconductor cooling device and a sensor on a butterfly wing plate, and a noise reduction hole is formed in the surface of the structure, so as to reduce the temperature of the butterfly wing plate and further improve the grease separation degree of the butterfly wing plate. This approach has the following disadvantages: (1) the semiconductor refrigeration element has the characteristics of small volume, light weight and the like, but the refrigeration coefficient is small, the electricity consumption is large, and the semiconductor refrigeration element is not economical; (2) because this device sets up at range hood air intake, there is the oil smoke and falls the risk that the hole got into semiconductor refrigeration component from making an uproar.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a range hood aiming at the problems in the prior art, which can improve the oil smoke suction effect, reduce the temperature of a smoke baffle plate to prevent scalding users and objects placed above the smoke baffle plate, and improve the oil separation degree.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a range hood, includes the air inlet subassembly, keeps off the cigarette board subassembly and is used for the heat sink to keeping off the cooling of cigarette board subassembly, the air inlet subassembly includes the casing and sets up the air intake in the casing front side, corresponding air intake department are provided with and keep off the cigarette board subassembly, its characterized in that: keep off the cigarette board subassembly and be cavity, the heat sink includes inhales the inside fan that keeps off the cigarette board subassembly and discharge, thereby take away the heat of keeping off the cigarette board subassembly with the outside air that is used for the cooling of range hood.

Preferably, be convenient for set up the fan, be convenient for simultaneously the intake and the discharge of air, the heat sink is still including setting up the baffle in the casing, form first heat dissipation channel between baffle and the casing, the fan sets up in first heat dissipation channel, keep off the inside second heat dissipation channel that constitutes of cigarette board subassembly, fluid intercommunication between first heat dissipation channel and the second heat dissipation channel, the casing has seted up the heat dissipation air intake with first heat dissipation channel department of correspondence, keep off cigarette board subassembly's top and seted up the heat dissipation air outlet.

Preferably, the baffle is the shape that both ends are buckled from top to bottom, the upper end of baffle is connected fixedly with the casing front side, the lower extreme and the fender cigarette board subassembly rear side of baffle are connected fixedly, keep off the rear side of cigarette board subassembly, be located the position of baffle lower extreme top and seted up the through-hole, through-hole fluid intercommunication between first heat dissipation passageway and the second heat dissipation passageway.

In order to automatically control the operation of the fan, the cooling device further comprises a temperature sensor for detecting the temperature of the smoke baffle assembly so as to control the operation of the fan.

In order to expand the distribution range of the negative pressure region at the edge of the smoke baffle plate component, the negative pressure region is expanded forwards and downwards, the oil smoke is buffered to impact the edge of the smoke baffle plate component, the oil smoke is guided, the risk of the oil smoke escaping from the edge during cooking is reduced, and the edge of the bottom of the smoke baffle plate component is streamline.

Preferably, the structure of cigarette board subassembly can be for, the cigarette board subassembly includes roof, bottom plate, preceding curb plate, posterior lateral plate, left side board and right side board, roof and bottom plate relative setting from top to bottom, preceding curb plate and posterior lateral plate set up relatively around, left side board and right side board set up relatively from left to right, the corresponding side at the roof is connected respectively to the upper end of preceding curb plate, posterior lateral plate, left side board and right side board, the corresponding side at the bottom plate is then connected respectively to the lower extreme of preceding curb plate, posterior lateral plate, left side board and right side board, heat dissipation air outlet sets up on the roof, the bottom plate is in the junction with preceding curb plate, left side board and right side board to the outside outstanding streamlined of cigarette board subassembly.

Preferably, for the separation of the bottom plate oil smoke of restraining flowing through for the oil smoke flows more stably, evenly in air intake department, increases the contact time and area of contact of oil smoke at the bottom plate, improves the grease resolution of keeping off the cigarette board subassembly, plays supplementary radiating effect with the heat sink cooperation simultaneously, the bottom plate has towards the recess that keeps off the inside sunken of cigarette board subassembly towards keeping off the outside surface of cigarette board subassembly.

Preferably, in order to better generate a turbulent flow effect, effectively inhibit the oil smoke from separating when flowing through the surface of the bottom plate and facilitate cleaning, the groove is hemispherical, the radius is R0, and the value range of R0 is 4-8 mm.

Preferably, for making the oil smoke flow more stably, evenly in air intake department, increase the contact time and the area of contact of oil smoke and bottom plate, increase the heat radiating area of bottom plate, the recess is the array and arranges, and the distance between the adjacent recess center is H1, and H1's value range is 123 ~ 140 mm.

Preferably, in order to effectively expand the distribution range of the negative pressure area at the edge of the smoke baffle assembly and reduce the risk of oil smoke escaping at the edge during cooking, the connecting part of the bottom plate and the front side plate is arc-shaped, the radius of the connecting part is R1, the connecting part of the bottom plate, the left side plate and the right side plate is arc-shaped, the radius of the connecting part is R2, the value range of R1 is 50-65 mm, and the value range of R2 is 45-65 mm.

Compared with the prior art, the invention has the advantages that: 1) the hollow smoke baffle plate assembly is cooled in an air cooling mode, so that the size is small, the heat dissipation efficiency is high, the temperature of the smoke baffle plate assembly is reduced, a user and objects placed above the smoke baffle plate assembly are prevented from being scalded, the oil and fat separation degree is improved, and the oil and smoke absorption effect is improved; 2) the single heat dissipation air channel is designed, so that heat can be removed in time, the smoke baffle plate assembly can be kept at a lower temperature all the time through the feedback of the temperature sensor, the heat dissipation air channel is reasonable in design, and the heat dissipation effect is good; 3) the smoke baffle assembly has streamline shape at the position directly contacted with the oil smoke, can effectively expand the distribution range of a negative pressure area at the edge of the smoke baffle plate, has the function of buffering the oil smoke to impact the edge of the smoke baffle plate, has good flow guiding function on the oil smoke, reduces the risk of the oil smoke escaping at the edge during cooking, and overcomes the problems of low suction and narrow suction inlet of an integrated kitchen product, small negative pressure and oil smoke escaping at the edge of the smoke baffle plate; 4) the surface of the part of the smoke baffle assembly, which is in direct contact with the oil smoke, is designed to be similar to the convex-concave golf ball, so that the separation of the oil smoke flowing through the smoke baffle plate can be inhibited, the oil smoke flows more stably and uniformly at the inlet of a smoke machine, the contact time and the contact area of the oil smoke on the smoke baffle plate are increased, the oil-fat separation degree of the smoke baffle plate is improved, a large amount of oil smoke is reduced from entering a fan system of the smoke machine without being separated, the service life of the fan system is prolonged, and meanwhile, the oil-fat separation degree is stronger with a cooling device; 5) the convex-concave structure increases the contact area of the smoke baffle assembly and the oil smoke, the condensation and oil hanging capacity is stronger, oil drops and condensed water drops are prevented from falling into a pot when a user cooks, and only a cleaning cloth is needed to wipe off the grease on the surface when the cooking is finished, so that the cooking device is easy to clean.

Drawings

FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;

FIG. 2 is a side 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 cross-sectional view of a range hood in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of a smoke barrier of the range hood according to the embodiment of the present invention;

FIG. 6 is a control schematic diagram of a range hood according to an embodiment of the present invention;

fig. 7 is a control flow chart 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 5, a range hood comprises an air intake assembly 1, an air suction assembly 2 and a smoke baffle assembly 3.

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, and the air intake channel 13 is in fluid communication with an outside of the range hood through the air inlet 12. The air inlet 12 is arranged at the lower part of the front side of the shell 11, and the lower end of the air inlet 12 is preferably flush with the lower end of the shell 11, thereby forming the low-suction range hood. The housing 11 is flat, and flat here 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.

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 blower frame 21 in the front-rear direction is larger than that of the housing 11, the blower system 22 is disposed on the front side inside the blower frame 21, and the portion of the blower frame 21 on the rear side of the blower system 22 is open at the lower end thereof so as to be connected to the upper end of the housing 11 and thus in fluid communication with the air intake passage 13 inside the housing 11.

The smoke barrier assembly 3 is disposed at the front side of the housing 11, extending forward from the junction with the housing 11. The upper end of the smoke barrier assembly 3 may be flush with the upper end of the air inlet 12, and the lower end corresponds to the upper portion of the air inlet 12. The smoke barrier assembly 3 comprises a top panel 31, a bottom panel 32, a front side panel 33, a rear side panel 34, a left side panel 35 and a right side panel 36. The top plate 31 and the bottom plate 32 are arranged up and down oppositely, the front side plate 33 and the rear side plate 34 are arranged front and back oppositely, the left side plate 35 and the right side plate 36 are arranged left and right oppositely, the upper ends of the front side plate 33, the rear side plate 34, the left side plate 35 and the right side plate 36 are connected to the corresponding side of the top plate 31 respectively, and the lower ends of the front side plate 33, the rear side plate 34, the left side plate 35 and the right side plate 36 are connected to the corresponding side of the bottom plate 32 respectively. Thus, the top plate 31, the bottom plate 32, the front plate 33, the rear plate 34, the left plate 35 and the right plate 36 together define a cavity, so that the smoke barrier assembly 3 is hollow. Except for the bottom plate 32, the other plates may be flat plates, and the top plate 31 may be used for storage.

The bottom plate 32 is a part of the smoke baffle assembly 3 mainly used for guiding oil smoke and contacting with the oil smoke. The bottom plate 32 is streamlined design, can effectively enlarge the negative pressure zone distribution range at the edge of the smoke baffle plate component 3 from this for the negative pressure zone expands forward, downwards, has the effect that the buffering oil smoke strikes the edge of the smoke baffle plate component 3, and streamlined design has good water conservancy diversion effect to the oil smoke, reduces the risk that the oil smoke escapes at the edge when cooking. In addition, the problems of narrow suction inlet, small negative pressure and smoke escape at the smoke blocking edge of a low-suction integrated kitchen range product are solved, and particularly, the problems are reflected in the cooking states of lifting a pot and a high pot. In the present embodiment, the streamlined design means that the bottom plate 32 is in the shape of a circular arc protruding outward of the smoke barrier assembly 3 at the connection with the front side plate 33, the left side plate 35, and the right side plate 36.

The outer surface of the sole plate 32 facing the exterior of the smoke barrier panel assembly 3 has a concave recess 321 facing the interior of the smoke barrier panel assembly 3, the recess 321 preferably being in the shape of a spherical cap so that the outer surface of the sole plate 32 is in a convex-concave design resembling a golf ball. In the present embodiment, the grooves 321 are arranged in an array, with the left-right direction arranged in rows and the front-rear direction arranged in columns. By arranging the groove 321, separation of oil smoke flowing through the bottom plate 32 can be inhibited, so that the oil smoke flows more stably and uniformly at the air inlet 12, the contact time and the contact area of the oil smoke at the bottom plate 32 are increased, the oil-fat separation degree of the smoke baffle plate component 3 is improved, a large amount of oil smoke is reduced and enters the fan system 22 without being separated, and the service life of the fan system 22 is prolonged; moreover, the convex-concave structure on the surface of the bottom plate 32 can increase the contact area with the oil smoke, so that the condensing and oil-hanging capabilities are stronger; when the user cooks, oil drops and condensed water drops fall into the pot, and when the cooking is finished, only the cleaning cloth is needed to wipe off the grease on the surface, so that the cooking pot is easy to clean.

Referring to fig. 1 and 3, preferably, the groove 321 is hemispherical, the radius of the groove is R0, and the preferable value range of R0 is 4-8 mm, and in the size range, the surface concavity can generate a turbulence effect, so that separation of oil smoke flowing through the surface of the bottom plate 32 is effectively inhibited, and when grease is accumulated on the inner surface of the groove 321, the grease can be wiped off by using a rag, and the cleaning is easy. The distance between the centers (spherical centers) of the adjacent grooves 321 is H1, and the preferable value range of H1 is 123-140 mm, so that the following effects can be achieved: (1) the oil smoke flows more stably and uniformly at the air inlet 12, and the contact time and the contact area between the oil smoke and the bottom plate 32 are increased; (2) the heat dissipation area of the base plate 32 is increased. The height of the smoke barrier plate assembly 3 is H2, here the height of the front side plate 33, the left side plate 34 and the right side plate 35, the heights of the three side plates are the same, the preferable range of H2 is 20-25 mm, and the width (the size in the front-rear direction) L1 of the smoke barrier plate assembly 3 is 896 mm. The bottom plate 32 and the front side plate 33 are connected, the arc radius of the bottom plate is R1, the connection positions of the bottom plate 32, the left side plate 35 and the right side plate 36 are symmetrical, the arc radius of the bottom plate is R2, the preferred value range of R1 is 50-65 mm, and the preferred value range of R2 is 45-65 mm. In the present embodiment, the above parameters are more preferably selected from the range of R0-5 mm, H1-15 mm, H2-24.5 mm, R1-59 mm, R1-50 mm, and L1-896 mm.

The surface of the bottom plate 32 of the smoke baffle component 3 of the application imitates the golf principle, namely, the grooves 321 are formed on the surface, the suction force of some small vortexes is generated, the fluid molecules on the surface of the bottom plate 32 are attracted by the vortexes, and the oil smoke is pushed back at the boundary layer separation point on the surface of the bottom plate 32. The function is not only shown at the edge of the smoke baffle plate component 3 of the application, and the separation phenomenon of the oil smoke and the smoke baffle plate is delayed, but also the same function is realized on the surface of the smoke baffle plate component 3 which is closer to the air inlet 12 of the range hood, and after the separation is delayed, the oil smoke flows into the air inlet 12 of the range hood with a larger negative pressure area until being sucked. The effect of delaying the separation: (1) preventing the oil smoke at the edge of the smoke baffle plate component 3 from escaping; (2) the contact time of the oil smoke and the smoke baffle plate component 3 is increased; (3) the smoke barrier assembly 3 having the groove 321 increases a contact area with the soot as compared with a plane smoke barrier.

In order to avoid the overhigh temperature of the smoke baffle plate component 3 and improve the separation degree of grease, the range hood also comprises a cooling device. The cooling device includes a partition plate 41 and a fan 42 provided in the housing 11. The partition plate 41 has a shape in which both ends are bent, and the upper end is connected and fixed to the inner front side of the case 11, thereby forming a first heat dissipation passage 43 between the case 11 and the partition plate 41. The lower end of the partition plate 41 is fixedly connected with the rear side plate 34 of the smoke barrier plate assembly 3 at a position lower than the top plate 31. A through hole 341 is formed in the rear side plate 34 of the smoke barrier assembly 3 at a position above the lower end of the partition plate 41, and a cavity formed inside the smoke barrier assembly 3 constitutes a second heat dissipation passage 44, and the first heat dissipation passage 43 and the second heat dissipation passage 44 are in fluid communication through the through hole 341. A heat dissipation air inlet 45 is formed at a position corresponding to the first heat dissipation channel 43 on the front side of the housing 11, so that the first heat dissipation channel 43 is in fluid communication with the outside of the range hood, and a heat dissipation air outlet 46 is formed on the top plate 31 of the smoke barrier assembly 3, so that the second heat dissipation channel 44 is in fluid communication with the outside of the range hood. The fan 42 is disposed in the first heat dissipation path 43, and can suck the air for temperature reduction into the first heat dissipation path 43 and discharge the air through the second heat dissipation path 44, thereby reducing the temperature of the smoke barrier assembly 3. The fan 42 is preferably a crossflow blower. The fans 42 may be arranged three by three at left and right intervals.

Furthermore, as can be seen from the above, the bottom plate 32 has a convex-concave structure, which can play a role of assisting heat dissipation: an infinite number of small thermal convections are easily formed on the inner surface of the bottom plate 32, which is an important way of heat transfer, the more intense the thermal convection, the faster the convection velocity, and the faster the heat transfer. The surface area of the bottom plate 32 is larger than a plane, the heat transfer capacity is large, and the heat transferred by the smoke baffle plate component 3 is taken away actively through the fan 42 to form an active heat dissipation system, so that the cooling device is high in cooling efficiency and good in heat dissipation effect.

Through the above setting, the heat dissipation process of the smoke baffle component 3 is as follows: the heat dissipation of the smoke baffle plate component 3 can simultaneously have heat conduction, heat radiation and heat convection. The oil smoke is a heat source, the smoke baffle plate component 3 is a conductor, and the first process is that the oil smoke continuously transfers heat to the smoke baffle plate component 3 in a heat conduction mode; the second process is that the fan 42 forms a medium for increasing heat conduction and heat convection, and the heat of the smoke baffle plate component 3 is continuously blown away by the fan 42; the third process is the final flow direction of heat exchange, and the arrangement of a heat dissipation channel with reasonable and sufficient space ensures good heat dissipation, as shown by the arrows in fig. 4, which is the flow path of air during heat dissipation.

To facilitate automatic control of the operation of the fan 42, the cooling device further comprises a temperature sensor 47, and preferably, the temperature sensor 47 may be a thermocouple. The temperature sensors 47 are disposed on the top plate 31 of the smoke barrier assembly 3, and in order to improve the detection accuracy, at least two temperature sensors 47 may be disposed, such as at least one is disposed adjacent to the heat dissipation outlet 46, and the other is disposed away from the heat dissipation outlet 46. In the present embodiment, six temperature sensors 47 are provided at regular intervals on the top plate 31, so that the temperatures of the respective positions of the top plate 31 are detected for comprehensive judgment for accurate control.

Referring to fig. 6, for a control schematic diagram, the cooling device further includes a main control unit including an adjusting loop, a feedback circuit, a judging circuit 487 and a fan control circuit 488, each temperature sensor 47 respectively constitutes a first detecting unit, a second detecting unit, … … and a sixth detecting unit, the first detecting unit can measure a corresponding position temperature value T₁The second detection unit can detect the temperature value T of the corresponding position₂… …, the sixth detecting unit can detect the corresponding position temperature value T₆. The feedback circuit includes a first feedback circuit 481, second feedback circuits 482, … …, and a sixth feedback unit 483 corresponding to each detection unit, and the regulation loop includes a first regulation loop 484, a

second regulation loop

485, 485 … …, and a sixth regulation loop 486 connected to the respective feedback circuits. The first detecting unit and the first regulating loop 484 are respectively connected to the input terminal of the first feedback circuit 481, and the second detecting unit and the second regulating loop 485 are respectively connected to the input terminal … … of the second feedback circuit 482 and the sixth detecting unitAnd a sixth regulation loop 486 are connected to the inputs of the sixth feedback circuit 483, respectively. Each regulating loop may be a zero setting circuit, such as a potentiometer, for temperature zero setting before use as a reference for temperature measurement by the temperature sensor 47; each feedback circuit may be an amplification circuit. The judgment circuit 487 is a logic circuit and functions as a circuit for performing logic operation.

The output terminals of the first feedback circuit 481, the output terminals of the second feedback circuit 482, … …, and the output terminal of the sixth feedback circuit 483 are respectively connected to the input terminals of the judgment circuit 487. An output of the decision circuit 487 is coupled to an input of the fan control circuit 488, and an output of the fan control circuit 488 is coupled to the fan 42. The judgment circuit 487 calculates an average value of the temperatures measured by the temperature sensors 47

And a function of determining whether or not the fan 42 is operating, where n is the number of the temperature sensors 47, and in this embodiment, n is 6

Referring to fig. 7, when cooking starts, the range hood starts to operate, and the first detection unit detects a temperature T₁The temperature T measured by the second detection unit₂… …, the sixth detecting unit detects the temperature T₆The main control unit calculates the average value of the six temperatures

And will T_mFed back to the decision circuit 487 as a decision condition for the operation of the fan 42.

When T is_m≥T₀When the temperature of the smoke baffle plate component 3 is too high, the hidden danger of scalding users and placing articles is caused. T is₀Is a preset temperature value for controlling whether the fan 42 is operated, such as 25 ℃ for example, and the judgment circuit 487 controls the fan 42 to start operating through the fan control circuit 488.

When T is_m＜T₀At this time, the determination circuit 487 stops the operation of the fan 42 by the fan control circuit 488.

In particular, the reason for choosing 25 ℃ as the threshold value is that the smoke barrier assembly 3 is at this temperature: (1) the risk of scalding users and placing articles does not exist; (2) at this moment, the smoke baffle plate component 3 is at a lower temperature and is matched with a cooling device, and the oil separation degree of the oil flowing through the smoke baffle plate component 3 is high.

The smoke baffle plate component 3 and the cooling device are not limited to a low-suction range hood, and can also be used in other types such as a side-suction range hood.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion and/or be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims

1. The utility model provides a range hood, includes air inlet subassembly (1), keeps off cigarette board subassembly (3) and is used for the heat sink to keeping off the temperature of cigarette board subassembly (3), air inlet subassembly (1) includes casing (11) and sets up air intake (12) at casing (11) front side, corresponding air intake (12) department are provided with and keep off cigarette board subassembly (3), its characterized in that: the smoke baffle component (3) is hollow, and the cooling device comprises a fan (42) which sucks air used for cooling outside the range hood into the smoke baffle component (3) and discharges the air so as to take away heat of the smoke baffle component (3); the smoke baffle assembly (3) extends forwards from the joint of the smoke baffle assembly and the shell (11), and the bottom edge of the smoke baffle assembly (3) is streamline.

2. The range hood of claim 1, wherein: the heat sink is still including setting up baffle (41) in casing (11), form first heat dissipation passageway (43) between baffle (41) and casing (11), fan (42) set up in first heat dissipation passageway (43), keep off inside second heat dissipation passageway (44) that constitutes of cigarette board subassembly (3), fluid communication between first heat dissipation passageway (43) and second heat dissipation passageway (44), casing (11) and first heat dissipation passageway (43) correspond the department and have seted up heat dissipation air intake (45), heat dissipation air outlet (46) have been seted up at the top of keeping off cigarette board subassembly (3).

3. The range hood of claim 2, wherein: the baffle (41) are the shape of upper and lower both ends bending, the upper end of baffle (41) is connected fixedly with the front side in casing (11), the lower extreme and the fender cigarette board subassembly (3) rear side of baffle (41) are connected fixedly, keep off the rear side of cigarette board subassembly (3), be located the position of baffle (41) lower extreme top and seted up through-hole (341), through-hole (341) fluid intercommunication between first heat dissipation passageway (43) and second heat dissipation passageway (44).

4. The range hood of claim 1, wherein: the cooling device also comprises a temperature sensor (47) for detecting the temperature of the smoke baffle component (3) so as to control the operation of the fan (42).

5. The range hood according to any one of claims 1 to 4, wherein: the smoke baffle component (3) comprises a top plate (31), a bottom plate (32), a front side plate (33), a rear side plate (34), a left side plate (35) and a right side plate (36), the top plate (31) and the bottom plate (32) are arranged oppositely up and down, the front side plate (33) and the rear side plate (34) are arranged oppositely front and back, the left side plate (35) and the right side plate (36) are arranged oppositely left and right, the upper ends of the front side plate (33), the rear side plate (34), the left side plate (35) and the right side plate (36) are respectively connected with the corresponding side surfaces of the top plate (31), the lower ends of the front side plate (33), the rear side plate (34), the left side plate (35) and the right side plate (36) are respectively connected with the corresponding side surfaces of the bottom plate (32), the heat dissipation air outlet (46) is formed in the top plate (31), and the bottom plate (32) is in a streamline shape protruding towards the outside of the smoke baffle assembly (3) at the connecting position with the front side plate (33), the left side plate (35) and the right side plate (36).

6. The range hood of claim 5, wherein: the outer surface of the bottom plate (32) facing the outside of the smoke baffle component (3) is provided with a groove (321) which is concave towards the inside of the smoke baffle component (3).

7. The range hood of claim 6, wherein: the groove (321) is hemispherical, the radius of the groove is R0, and the value range of R0 is 4-8 mm.

8. The range hood of claim 6, wherein: the grooves (321) are arranged in an array mode, the distance between the centers of the adjacent grooves (321) is H1, and the value range of H1 is 123-140 mm.

9. The range hood of claim 5, wherein: the connecting part of the bottom plate (32) and the front side plate (33) is arc-shaped, the radius of the connecting part is R1, the connecting parts of the bottom plate (32), the left side plate (35) and the right side plate (36) are arc-shaped, the radius of the connecting part is R2, the value range of R1 is 50-65 mm, and the value range of R2 is 45-65 mm.