CN111306593B - Range hood and control method thereof - Google Patents
Range hood and control method thereof Download PDFInfo
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- CN111306593B CN111306593B CN202010181133.9A CN202010181133A CN111306593B CN 111306593 B CN111306593 B CN 111306593B CN 202010181133 A CN202010181133 A CN 202010181133A CN 111306593 B CN111306593 B CN 111306593B
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- air inlet
- range hood
- smoke
- guide rail
- rotating
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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
- F24C15/2021—Arrangement or mounting of control or safety systems
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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
- F24C15/2078—Removing cooking fumes movable
- F24C15/2092—Removing cooking fumes movable extendable or pivotable
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- 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 a shell and a smoke baffle component, wherein an opening is formed in the front side of the shell, the smoke baffle component comprises a smoke baffle arranged at the opening so as to open or close the opening, and the range hood is characterized in that: the smoke baffle plate can be in a state of closing the opening or a state of opening the opening by upwards turning the lower end into the shell, and the smoke baffle plate assembly further comprises an air inlet assembly which is arranged on the smoke baffle plate and can enable oil smoke to flow through and enter the shell. Also discloses a control method of the range hood. Compared with the prior art, the invention has the advantages that: 1) the smoke baffle and the air inlet assembly are integrated, so that parts are simplified, the smoke baffle is turned inwards, the risk of pan-making is avoided when the smoke baffle is opened, the sight is not blocked in the opened state, the visual compression is reduced, and the user experience is improved; 2) the air inlet is internally provided, and the smoke baffle and the left and right side plates of the shell form a smoke collection cavity, so that the smoke collection performance is improved.
Description
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 side-draft range hood absorbs most of oil smoke close to a cooking bench in an arc form by using a vortex air pressure principle, so that adverse effects on human health can be reduced, and the suction effect of a power source is basically not reduced because the power source is close to the cooking bench. In order to improve the effect of the range hood, a turnable smoke baffle is usually arranged at an air inlet, such as the range hood disclosed in chinese patent with application number 201821613031.4, in which the smoke baffle can be turned open, the range hood comprises a housing, a fan assembly arranged in the housing, a smoke discharge box arranged above the housing, a panel, an oil screen, a smoke baffle assembly and a pushing assembly, the panel is arranged below the front side of the housing, the smoke baffle assembly is movably arranged above the panel, one end of the pushing assembly is arranged on the housing, and the other end of the pushing assembly is hinged with the smoke baffle assembly and drives the smoke baffle assembly to open or close; the utility model discloses a keep off cigarette board subassembly and outwards overturn under the effect that promotes the subassembly and open, open back oil net air intake direction and oil smoke and rise the direction unanimous basically and very near from the smoke source, can inhale the oil smoke fast, keep off the cigarette board subassembly simultaneously and further play and block the oil smoke and toward escaping in front to promote the oil absorption cigarette effect greatly.
However, similar to the smoke baffle described in the above patent, the smoke baffle blocks the view during cooking, giving people a sense of oppression, and generating a smoke leakage phenomenon when the oil smoke is large. In order to solve the problem that the smoke baffle shields the sight, the general method is as follows: the width of the smoke baffle is reduced, so that the effect of the cigarette cage is sacrificed; or the opening angle of the smoke baffle plate is made small, so that the area of the air inlet is sacrificed. In order to solve the problem of smoke leakage, the conventional method is to increase the air volume and back pressure of the fan system, which greatly increases the cost compared with the conventional range hood.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a range hood aiming at the problems in the prior art, so that the cooking operation experience is improved, and the smoke collection effect is improved.
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 casing and keeps off the cigarette board subassembly, the front side of casing is opened and is equipped with the opening, thereby keep off the cigarette board subassembly including setting up at the opening part, can open or close open-ended and keep off cigarette board, its characterized in that: the smoke baffle plate can be in a state of closing the opening or a state of opening the opening by upwards turning the lower end into the shell, and the smoke baffle plate assembly further comprises an air inlet assembly which is arranged on the smoke baffle plate and can enable oil smoke to flow through and enter the shell.
For the upset of automatic drive cigarette board, the casing is including the front panel that is located the front side, the opening is seted up on the front panel, range hood is still including the first motion that is used for the drive to keep off the upset of cigarette board, linear drive module, pivot and the pivot support of linear movement about first motion includes the output, the pivot support sets up in the position that keeps off the cigarette board and is close to the lower extreme, the pivot sets up on the pivot support, rotates with the output of linear drive module and is connected, the pivot extends in left right direction, the upper end and the front panel sliding fit that keep off the cigarette board.
In order to guide the action of the upper end of the cigarette blocking plate, the first movement mechanism further comprises a sliding rail and a sliding groove, the sliding rail is arranged at the position, close to the front end, of the cigarette blocking plate, and the sliding groove in sliding fit with the sliding rail is formed in the front panel by upwards sinking and extending the opening.
In order to reduce the friction force applied to the upper end of the smoke baffle plate during movement and avoid the upper end from falling off, one side of the sliding rail, which is far away from the smoke baffle plate, is open, a guide piece is arranged in the sliding chute, the guide piece extends downwards from the end part, which is far away from the opening, of the sliding chute, the tail end of the guide piece is arranged in the sliding rail, the guide piece and the sliding rail are in rolling connection through a rolling bearing, and a rotating shaft of the rolling bearing extends in the left-right direction; the left side and the right side of the open end of the sliding rail are respectively bent towards the middle to form flanges capable of clamping the rolling bearing in the sliding rail.
Preferably, first motion is still including setting up first actuating mechanism and the second drive mechanism in the casing, first actuating mechanism and second drive mechanism constitute sharp drive module, first actuating mechanism is the motor, second drive mechanism includes lead screw and the sleeve that extends in vertical direction, the sleeve cover is established on the lead screw and threaded connection, pivot and sleeve rotate to be connected.
In order to control the air inlet area according to the oil smoke quantity, an air inlet channel capable of adjusting the air inlet area is formed on the air inlet component.
Preferably, in order to conveniently realize dynamic stepless adjustment, the air inlet assembly comprises at least two rotating blades arranged along the circumferential direction, two sides of the adjacent rotating blades are attached to each other in the circumferential direction, the end parts of the rotating blades facing the middle part form a circular air inlet channel together, each rotating blade gradually increases in width from the end part facing the middle part to the outside, and the rotating blades can translate and rotate so as to expand or reduce the air inlet channel.
Preferably, the air inlet assembly further comprises a bottom plate and a rotating plate arranged on the front side of the bottom plate, the rotating blades are arranged between the bottom plate and the rotating plate, the bottom plate is fixed on the smoke baffle plate, a first circular air inlet is formed in the bottom plate, and each rotating blade is in sliding fit with the bottom plate; a second air inlet is formed in the middle of the rotating plate, the second air inlet corresponds to the first air inlet, and each rotating blade is in sliding and rotating fit with the rotating plate; the rotating plate can rotate around the center of the second air inlet, so that the rotating blades are driven to translate and rotate.
Preferably, the surface of the bottom plate facing the rotating plate is formed with first guide rail grooves, the number of which is the same as that of the rotating blades, each first guide rail groove is tangent to the first air inlet, one side of each rotating blade facing the bottom plate is provided with a guide rail bar, and the guide rail bar is slidably arranged in the first guide rail grooves, so that the rotating blades are slidably matched with the bottom plate; second guide rail grooves are further formed in the rotating plate and located on the periphery of the second air inlet, the number of the second guide rail grooves is the same as that of the rotating blades, the second guide rail grooves are distributed in a radial mode, each second guide rail groove extends in an arc-shaped mode from one end, close to the second air inlet, to the direction far away from the second air inlet, and the bending directions of the second guide rail grooves are the same; and one end of each rotating blade, which is far away from the middle, is connected with the second guide rail groove through a first bolt, and the first bolt is in sliding connection with the second guide rail groove and can rotate along the axis of the rotating blade relative to the second guide rail groove, so that the rotating blades are in sliding and rotating fit with the rotating plate.
The air inlet assembly further comprises a second movement mechanism, the second movement mechanism is arranged on one side, facing the shell, of the bottom plate and comprises a second driving mechanism and a second transmission mechanism, the second transmission mechanism comprises a crank and a connecting rod, the crank and the second driving mechanism drive the second movement mechanism to rotate, one end of the connecting rod and one end, far away from the second driving mechanism, of the crank are rotatably connected, the other end of the connecting rod is connected with the rotating plate through a second bolt, a third guide rail groove is further formed in the periphery, located on the bottom plate, of the first guide rail groove, the third guide rail groove is arc-shaped and is concentrically arranged with the first air inlet, the second bolt penetrates through the third guide rail groove to be respectively connected with the connecting rod and the rotating plate, and the second bolt is fixedly connected with the rotating plate and rotatably connected with the connecting rod.
The negative pressure sensor is arranged on one side of the bottom plate facing the shell and positioned at the edge of the first air inlet, and the oil smoke concentration sensor is arranged on one side of the smoke baffle facing the shell.
For the commonality that improves to many cigarette stoves, the air inlet subassembly includes threely, and one of them air inlet subassembly is located the centre that keeps off the cigarette board, other two left and right sides that are located this air inlet subassembly respectively.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a control method of the range hood is characterized in that the range hood further comprises a fan system, and the control method comprises the following steps: the control method comprises the following steps:
1) starting the range hood, and turning over and opening the smoke baffle;
2) the oil smoke concentration sensors corresponding to the air inlet components on the left side and the right side detect real-time oil smoke concentration Q, whether the stove burner below the range hood is opened on two sides is judged, and if Q is judgedLeft side of＞0，QRight side＞0，QLeft side of、QRight sideRespectively for the detected real-time oil smoke concentration on the left side and the right side, the air inlet components on the left side and the right side are controlled to open air inletA channel is opened with the area of 1/2A, A is the maximum area of the air inlet channel, and the step 3) is carried out; if Q isLeft side of＞QRight sideIf the value is 0, the left furnace end is started, the air inlet components on the left side and the middle are controlled to open the air inlet channel, the opened area is 1/2A, and the step 3) is carried out; if Q isRight side＞Q Left side ofIf the value is 0, the right furnace end is started, the air inlet components on the right side and the middle part are controlled to open the air inlet channel, the opened area is 1/2A, and the step 3) is carried out;
3) detect the real-time backpressure current I of the motor of the fan system of range hood, switch the gear of the fan system: if I < IWeak (weak)The fan system is switched to a weak gear if IWeak (weak)＜I＜IHigh strengthThe fan system is switched to a strong gear if I is larger than IHigh strengthIf the fan system is switched to the T gear IWeak (weak)、IHigh strengthThe two values are preset gear switching critical values; the gears of the weak gear, the strong gear and the T gear are gradually increased;
4) detecting real-time negative pressure value P at corresponding air inlet component of air inlet channel in open state1And P2，P1Is the negative pressure value, P, at the air inlet component positioned at the left side in the two opened air inlet components2The negative pressure value of the air inlet component positioned at the right side in the two opened air inlet components is obtained;
5) the air inlet area of the air inlet channel is distributed, and the air inlet channel area on the left side of the two opened air inlet components is (P)1/(P1+P2) A, the area of the air inlet channel on the right side in the two opened air inlet assemblies is (P)1/(P1+P2))*A；
6) Adjusting the two air inlet channels to corresponding areas according to the distribution principle of the step 5);
7) when the oil smoke concentration sensors corresponding to the air inlet components on the left side and the right side detect the real-time oil smoke concentration value QLeft side of＝0、QRight sideWhen the machine closing key is pressed, the range hood finishes working; otherwise, go back to step 2).
Compared with the prior art, the invention has the advantages that: 1) the smoke baffle and the air inlet assembly are integrated, so that parts are simplified, the smoke baffle is turned inwards, the risk of pan-making is avoided when the smoke baffle is opened, the sight is not blocked in the opened state, the visual compression is reduced, and the user experience is improved; 2) the air inlet is internally provided, and the smoke baffle and the left and right side plates of the shell form a smoke collection cavity, so that the smoke collection performance is improved; 3) the three air inlet assemblies are arranged, so that various cooking utensils in the market can be used, and the oil smoke capturing capability is improved; 4) The air inlet is dynamically adjustable according to the oil smoke amount, the air inlet area is effectively utilized, energy is saved, oil smoke is prevented from escaping, the air speed is improved, and the smoking capacity is improved.
Drawings
Fig. 1 is a schematic view of a range hood according to an embodiment of the present invention in a closed state;
FIG. 2 is a side view of a range hood in a closed state according to an embodiment of the present invention;
FIG. 3 is a sectional view of a range hood according to an embodiment of the present invention in a closed state;
FIG. 4 is a sectional view of the casing, the oil cup, the smoke baffle assembly and the moving mechanism thereof in the closed state of the range hood according to the embodiment of the invention;
fig. 5 is a schematic view of a smoke baffle assembly of the range hood according to the embodiment of the invention;
FIG. 6 is a schematic view of an air intake adjusting assembly of a smoke barrier assembly of the range hood according to the embodiment of the present invention in a closed state;
FIG. 7 is an exploded view of the intake air adjustment assembly of FIG. 6;
FIG. 8 is a schematic view of a base plate of the intake air adjustment assembly of FIG. 6;
FIG. 9 is a schematic view of the rotating vanes of the intake air adjustment assembly of FIG. 6;
fig. 10 is a schematic view of an open state of an air intake adjusting assembly of a smoke barrier assembly of the range hood according to the embodiment of the invention;
FIG. 11 is an exploded view of the intake air adjustment assembly of FIG. 10;
fig. 12 is a schematic view of an intermediate state of the range hood according to the embodiment of the present invention;
FIG. 13 is a side view of a range hood in an intermediate state according to an embodiment of the present invention;
FIG. 14 is a cross-sectional view of the housing, oil cup, smoke barrier assembly and its moving mechanism in the intermediate state of the range hood of the embodiment of the present invention;
fig. 15 is a schematic view of a sliding rail fit state of a housing and a smoke baffle assembly of the range hood according to the embodiment of the invention;
fig. 16 is a schematic view of an open state of the range hood according to the embodiment of the present invention;
fig. 17 is a side view of a range hood according to an embodiment of the present invention in an open state;
fig. 18 is a sectional view of the housing, the oil cup, the smoke barrier assembly and the moving mechanism thereof in the open state of the range hood according to the embodiment of the present invention;
fig. 19 is a schematic view of an oil guide plate of the range hood according to the embodiment of the present invention;
fig. 20 is a control flow diagram 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 and fig. 16, a range hood includes a housing 1, a fan frame 2 disposed above the housing 1, a fan system 3 disposed in the fan frame 2, a smoke baffle assembly 4, an oil guide plate 5 disposed in the housing 1, an air outlet cover 6 disposed at an air outlet of the fan system 3, and an electrical box 7. Wherein the air-out cover 6 and the electrical box 7 are arranged at the top of the fan frame 2, the air-out cover 6 is used for discharging the oil smoke gas flow discharged by the fan system 3 to a smoke discharge pipe (not shown), and the electrical box 7 is used for connecting the fan system 3, the main controller (not shown, used for controlling the fan system 3 and other electrical elements) and an external power supply.
The casing 1 is hollow, the front side of the casing 1 is inclined from top to bottom and extends backward gradually, so that the longitudinal section (the front-back section) is triangular, and a smoke collecting cavity 11 is formed in the casing 1. The housing 1 includes left and right side plates 12, a front plate 13, a top plate 14, and a rear plate 15, the front plate 13 being located between front sides of the side plates 12, the top plate 14 being located between top ends of the side plates 12, and the rear plate 15 being located between rear sides of the side plates 12. The front side of the side plate 12 is inclined gradually backward from top to bottom to form a substantially triangular shape, and the front panel 13 is correspondingly inclined gradually backward from top to bottom. The fan frame 2 is arranged above the shell 1, and the top plate 14 of the shell 1 is opened at the joint with the fan frame 2, so that the oil smoke in the smoke collection cavity 11 can enter the fan frame 2 and be discharged by the fan system 3.
The front panel 13 is provided with an opening 131, and the opening 131 is preferably rectangular, and the longitudinal direction of the opening 131 is the left-right direction. The top end of the opening 131 is located below the top end of the front panel 13, and the bottom end of the opening 131 can extend to the bottom end of the front panel 13. The smoke baffle plate assembly 4 comprises a smoke baffle plate 41 and an air inlet assembly 42 arranged on the smoke baffle plate 41, wherein the shape and the size of the smoke baffle plate 41 are matched with the opening 131 on the front panel 13, when the range hood is in a closed state, the smoke baffle plate 41 closes the opening 131, and for convenience of description, the upper end and the lower end of the smoke baffle plate 41 are both directed to the position of the smoke baffle plate 41 in the state of closing the opening 131. Referring to fig. 5, the number of the air intake assemblies 42 is three, and the air intake assemblies are respectively arranged at intervals in the left-right direction, wherein one air intake assembly 42 is located at the middle position of the smoke barrier 41 in the left-right direction, and the other two air intake assemblies 42 are located at the left and right sides thereof.
Referring to fig. 4 and 5, a first moving mechanism 8 for driving the smoke barrier assembly 4 to turn relative to the front panel 13 is disposed in the housing 1, and includes a first driving mechanism 81, a first transmission mechanism 82, a rotating shaft 83, a rotating shaft bracket 84, a sliding rail 85 and a sliding groove 86. The first driving mechanism 81 and the second transmission mechanism 82 constitute a linear driving module, and are disposed in the housing 1 near the side plate 12. In this embodiment, it is preferable that the first driving mechanism 81 is a motor, the second transmission mechanism 82 includes a screw 821 and a sleeve 822, the screw 821 extends in the vertical direction, and the sleeve 822 is sleeved on the screw 821 and is in threaded connection with the screw. Thus, when the motor is started, the screw 821 is driven to rotate around its axis, and the sleeve 822 linearly moves up and down along the axial direction of the screw 821. The first driving mechanism 81 and the second transmission mechanism 82 can also be other existing linear driving modules, such as an electric push rod, a combination of a motor and a gear rack, and the like.
The rotating shaft support 84 is arranged at the position close to the lower end of the left side and the right side of the smoke baffle plate 41, the rotating shaft support 84 can be roughly triangular, the bottom edge of the rotating shaft support is fixedly connected with the smoke baffle plate 41, the rotating shaft 83 is arranged at the top end, far away from the smoke baffle plate 41, of the rotating shaft support 84, the rotating shaft 83 is rotatably connected with the sleeve 822, and the rotating shaft 83 extends in the left-right direction and in the direction far away from the smoke baffle plate 41, so that the lower end of the smoke baffle plate 41 can move up and down along with the sleeve 822 and can be turned over relatively. Thus, when the sleeve 822 moves up and down, the lower end of the smoke barrier 41 is driven upward and turned upside down, so that the smoke barrier 41 opens the opening 131 of the front panel 13.
The slide rails 85 are disposed at the left and right sides of the smoke barrier 41 near the upper end, the slide rails 85 extend in the longitudinal direction, and the front panel 13 is formed with slide grooves 86 which are matched with the slide rails 85 and extend from the opening 131 to the upper direction. Referring to fig. 15, the side of the slide rail 85 away from the smoke barrier 41 is open (the top surface is open in the open state), and the slide rail 85 is slidably disposed in the slide groove 86 of the front panel 13. A guide part 861 is arranged in the sliding groove 86, the guide part 861 extends downwards from the end part of the sliding groove 86 far away from the opening 131, the tail end of the guide part 861 is arranged in the sliding rail 85, the guide part 861 and the sliding rail 85 are in rolling connection through a rolling bearing 862, and friction force between the sliding rail 85 and the sliding groove 86 can be reduced. The rotational shaft of the rolling bearing 862 extends in the left-right direction. The left side and the right side of the open end of the slide rail 85 are respectively bent towards the middle to form flanges 851, and the rolling bearings 862 are clamped in the slide rail 85, so that the upper end of the smoke baffle plate 41 is prevented from falling. When the lower end of the smoke barrier 41 is driven by the sleeve 822 to move upwards and turn over, the upper end of the smoke barrier 41 slides forwards through the matching of the sliding rail 85 and the sliding groove 86.
The two first motion mechanisms 8 are respectively arranged at the left side and the right side as a driving end and a driven end, and when the first motion mechanism 8 is used as the driven end, the first driving mechanism 81 and the first transmission mechanism 82 are not needed, and only the lifting track of the rotating shaft 83 needs to be limited.
Referring to fig. 4, when the range hood is in the working state and is closed, the extending direction of the smoke barrier 41 is consistent with that of the front panel 13, so as to close the opening 131 on the front panel 13, and the air intake assembly 42 is in the closed state. Referring to fig. 12 to 14, when the range hood needs to be opened for operation, the first moving mechanism 8 is started to drive the lower end of the smoke barrier 41 to move upward, the smoke barrier 41 is turned upward as a whole, and the upper end of the smoke barrier gradually slides out from the upper edge of the opening 131 of the front panel 13. Referring to fig. 16 to 18, the first movement mechanism 8 continues to operate until the smoke barrier 41 is completely opened, for example, can be in a position close to the horizontal position, the sleeve 822 moves to the top end of the screw 821, when the smoke flows upward and contacts the smoke barrier 41, the smoke barrier 41 can guide the flow of the smoke, the air intake assembly 42 is at least partially opened, and the smoke can enter the smoke collection cavity 11 and flow upward into the fan frame 2, and is discharged by the fan system 3.
In order to better close the opening 131 when the smoke barrier 41 is closed and avoid a gap between the upper end of the smoke barrier 41 and the upper edge of the opening 131, in the present embodiment, the upper end of the smoke barrier 41 partially overlaps the front panel 13 above the upper edge of the opening 131 when the smoke barrier 41 is closed. In order to prevent the smoke barrier 41 from protruding out of the front panel 13, the thickness of the overlapping portion of the smoke barrier 41 and the front panel 13 may be smaller than the thickness of the other portions, so that the total thickness of the overlapping portion of the smoke barrier 41 and the front panel 13 is equivalent to the thickness of the front panel 13 or the smoke barrier 41.
Because the smoke baffle plate 41 needs a certain space for inward turning and the first movement mechanism 8 needs a certain space for arrangement, the invention adopts the structure of the upper fan system 3, and avoids the interference of the fan system 3, the smoke baffle plate 41 and the first movement mechanism 8.
Referring to fig. 5 to 11, each of the air intake assemblies 42 has the same structure, can adjust the size of the air intake area, and respectively includes a bottom plate 421, a rotary blade 422 disposed on the bottom plate 421, a rotary plate 423 disposed in front of the bottom plate 421, and a second movement mechanism 424 for driving the rotary plate 423 and the rotary blade 422 to rotate. The bottom plate 421 and the rotating plate 423 are preferably circular, the bottom plate 421 is fixed on the smoke baffle plate 41, a through hole adapted to the bottom plate 421 can be opened on the smoke baffle plate 41 so as to set the bottom plate 421, the rotating plate 423 is set at the front side of the bottom plate 421, and the rotating blade 422 is set between the bottom plate 421 and the rotating plate 423. Preferably, a surface of the bottom plate 421 facing the inside of the housing 1 is flush with a surface of the smoke barrier 41 facing the inside of the housing 1, and a surface of the rotating plate 423 facing away from the bottom plate 421 is flush with a surface of the smoke barrier 41 facing the outside of the housing 1. The rotary blades 422 have at least two, and each blade 422 has the same shape. The bottom plate 421 is provided with a first air inlet 4211, the first air inlet 4211 is circular and is arranged in the middle of the bottom plate 421, first guide rail grooves 4212 with the same number as the rotary blades 422 are formed on the surface of the bottom plate 421 facing the rotary plate 423, one end of each first guide rail groove 4212 is located on the edge of the first air inlet 4211, and the other end of each first guide rail groove 4212 extends in the direction away from the first air inlet 4211 and forms a tangent line of the first air inlet 4211. A guide rail 4223 is provided on a side of each rotary blade 422 away from the rotary plate 423, and the guide rail 4223 is slidably disposed in the first guide rail groove 4212 to guide the sliding of the rotary blade 422.
The middle of the rotating plate 423 is provided with a second air inlet 4231, and the size, shape and position of the second air inlet 4231 correspond to the first air inlet 4211. The rotating plate 423 is further provided with a second guide rail groove 4232 at the outer periphery of the second air inlet 4231, and the second guide rail groove 4232 is preferably a through groove penetrating at least the surface of the rotating plate 423 facing the bottom plate 421. The number of the second rail grooves 4232 is the same as the number of the rotary blades 422. The second guide rail grooves 4232 are radially distributed, and each second guide rail groove 4232 arcuately extends from an end close to the second air inlet 4231 to a direction away from the second air inlet 4231, and the bending directions of the second guide rail grooves 4232 are identical.
Each rotary blade 422 has a connection end (end away from the middle) connected to the second rail groove 4232 by a first latch 4221, and a free end (end toward the middle). Each of the rotary blades 422 is gradually increased in width (dimension in the circumferential direction) from a free end, which is preferably a tip, to a connection end. The first bolt 4221 is slidably connected with the second guide rail groove 4232 and can rotate along the axis of the first bolt relative to the second guide rail groove 4232. Thus, the first latch 4221 allows the rotary vane 422 to slide along the second guide rail groove 4232, defining a rotation track of the rotary vane 422, i.e., to be able to translate and rotate with respect to the rotary plate 423. Two adjacent rotating blades 422 are in contact with each other at all times at both sides in the circumferential direction. The free ends of the rotary blades 422 define an air inlet passage 4222, and the air inlet passage 4222 can be expanded or contracted along with the rotation of the rotary blades 422, and the air inlet passage 4222 can be completely closed at minimum and is the same as the first air inlet 4211 on the bottom plate 421 at maximum.
The second movement mechanism 424 is disposed on a side (rear side) of the bottom plate 421 facing the inside of the housing 1, and includes a second driving mechanism 4241 and a second transmission mechanism 4242, preferably, the second driving mechanism 4241 is a motor, the second transmission mechanism 4242 includes a crank 42421 connected to an output end of the second driving mechanism 4241 and a connecting rod 42422, one end of the connecting rod 42422 and one end of the crank 42421 away from the end connected to the second driving mechanism 4241 are rotatably connected, and the other end of the connecting rod 42422 is connected to the rotating plate 423 through a second bolt 4243. A third guide rail groove 4213 is further formed in the bottom plate 421 and located at the periphery of the first guide rail groove 4212, and the third guide rail groove 4213 is arc-shaped and is concentric with the first air inlet 4211. The third guide groove 4213 is a through groove, the second latch 4243 passes through the third guide groove 4213 to be respectively connected with the link 42422 and the rotary plate 423, and the second latch 4243 is fixedly connected with the rotary plate 423 and rotatably connected with the link 42422. When the second driving mechanism 4241 is activated, the second transmission mechanism 4242 is driven to rotate (rotate in a plane parallel to the smoke barrier 41), and the movement track of the connecting rod 42422 is limited by the third guide rail groove 4213, so that the rotating plate 423 is driven to rotate by the second bolt 4243 (the rotation center is the center of the first air inlet 4211 of the bottom plate 421, namely the center of the second air inlet 4231 of the rotating plate 423), when the rotating plate 423 rotates, the first bolt 4221 is driven to slide along the second guide rail groove 4232, so that the rotating blade 422 is translated and rotated, and the air inlet passage 4222 formed by the free end thereof is continuously enlarged (fig. 10 and 11, when the rotating plate 423 is opened 1/2, the first bolt 4221 is positioned in the middle of the second guide rail groove 4232) or reduced to be closed (fig. 6 and 7, when the rotating plate is completely closed, the first bolt 4221 is positioned at the inner end of the second guide rail groove 4232 close to the second air inlet 4231). The intake assembly 42 is similar to the size adjustment mechanism for the camera aperture.
In order to facilitate automatic control of the turning of the smoke baffle 41 and the adjustment of the air intake assembly 42, the range hood further comprises a negative pressure sensor 91 and an oil smoke concentration sensor 92, wherein the negative pressure sensor 91 is disposed on one side of the bottom plate 421 facing the inside of the housing 1 and located at an edge of the first air inlet 4211. The smoke concentration sensor 92 is provided on the side of the smoke barrier 41 facing the inside of the casing 1, on the outer periphery of the bottom plate 421, near the lower end of the smoke barrier 41. The oil smoke concentration sensor 92 is an infrared sensor, and can detect the concentration of oil smoke through the glass of the smoke barrier 41. The two sensors and the two motion mechanisms can be respectively and electrically connected to a main controller of the range hood, and the motion of the motion mechanisms is controlled according to signals of the sensors.
In the invention, by arranging three air inlet assemblies 42, the air inlet device has good universality: with the updating iteration of the cooking utensils, a single-hole stove, a double-hole stove, a three-hole stove and a multi-hole stove are already available on the market, so that the three air inlet assemblies 42 can be used for the cooking utensils on the market; in addition, to the common binocular kitchen in the market, two furnace ends set up respectively in the left side between air intake and the right air intake, when the external world has the horizontal wind to disturb (air current disturbance), the skew of a segment can take place for the oil smoke, but its offset can be ensured in the left side (or in the right) between the air intake, compare the single air intake in the middle of traditional and the two air intakes of both sides, set up the three air intakes that have middle air intake, more can catch the oil smoke.
Referring again to fig. 3 and 19, the oil deflection plate 5 is disposed within the housing 1, is similar in shape to the housing 1, and constitutes a cavity that is open at the front. The top of the oil guide plate 5 is located at the joint of the casing 1 and the fan frame 2, and is in the form of a grid net 51, so that oil smoke entering the fan frame 2 can be filtered and rectified. The oil guide plate 5 has through grooves 52 extending vertically formed on left and right sides thereof so that the sleeve 822 passes through the through grooves 52 to be connected to the rotation shaft 83.
In the process of turning over the smoke barrier 41, the lower end thereof is closely attached to or close to the rear side of the oil guide plate 5, and the left and right ends thereof are closely attached to or close to the left and right edges of the opening 131, thereby preventing oil smoke from entering the housing 1 from the gap (negative pressure is concentrated in the middle, where oil smoke is hardly generated).
The oil guide plate 5 guides the grease to the bottom of the shell 1, an oil cup 10 is arranged below the shell 1, an oil leakage hole 16 is formed in the bottom of the shell 1, and the grease enters the oil cup 10 through the oil leakage hole 16. When the smoke barrier 41 is in the closed state, the lower end thereof can be inserted into the oil cup 10, so that grease separated on the smoke barrier 41 can flow into the oil cup 10.
The air inlet component 42 can absorb oil smoke at fixed points and distribute air inlet areas according to the oil smoke quantity. The existing range hood has the following problems that a user often uses one burner to cook, when the range hood is opened, air inlet on one side is wasted, the user sometimes uses two burners to cook, but the oil smoke amount on two sides is inconsistent, and because the air inlet area is not distributed according to the requirement, the air inlet amount on one side with small oil smoke amount is excessive, and the air inlet amount on one side with large oil smoke amount is insufficient, so that the oil smoke escape phenomenon is generated.
For this purpose, the following principles are used:
the relationship among the air inlet area, the section average velocity and the volume flow can be known by a fluid continuity equation as follows:
whereinQGeneral assemblyIs the total volume flow of the inlet air, AnIs the area of the air inlet, VnThe average speed of the oil smoke at the section is shown, and n is the number of the air inlets. Keeping V unchanged, only changing A along with Q.
The negative pressure sensor 91 detects the air pressure (negative pressure), and the smoke concentration sensor 92 detects the amount of smoke on both sides. Specifically, referring to fig. 20, the control flow is as follows:
1) firstly, a user starts the range hood, and the smoke baffle plate 41 is turned over and opened;
2) the oil smoke concentration sensors 92 corresponding to the air inlet components 42 on the left side and the right side detect the real-time oil smoke concentration Q at the corresponding positions, and judge whether the stove burner is opened on two sides, if so, Q isLeft side of＞0，QRight side＞0，QLeft side of、QRight sideRespectively detecting the real-time oil smoke concentrations on the left side and the right side, controlling the air inlet assemblies 42 on the left side and the right side to open the air inlet channel 4222 to enable the area of the air inlet channel to be 1/2A, wherein A is the area of the first air inlet 4211, and entering the step 3); if Q isLeft side of＞QRight sideIf the value is 0, the left burner is started, the left and middle air inlet assemblies 42 are controlled to open the air inlet channel 4222, so that the area of the air inlet channel is 1/2A, and the step 3) is carried out; if Q isRight side＞QLeft side ofIf the value is 0, the right burner is started, the air inlet components 42 at the right side and the middle part are controlled to open the air inlet channel 4222, the area of the air inlet channel is 1/2A, and the step 3) is carried out;
3) detect the real-time backpressure current I of the motor of the fan system 3 of range hood, switch the gear of the fan system 3: if I < IWeak (weak)The fan system 3 is switched to the weak gear if IWeak (weak)＜I＜IHigh strengthThe fan system 3 is switched to a strong gear if I is more than IHigh strengthIf so, the fan system 3 is switched to the T gear (highest gear), IWeak (weak)、IHigh strengthThe two values are preset gear switching critical values; the back pressure current detection is integrated in a main controller of the range hood, a resistor is arranged in the main controller, and the change of the current can be calculated by detecting the voltage at two ends of the resistor, which is the prior art; in the present invention, the calibration of the weak gear is: the air intake of the range hood is between 0 and 10m3/min, and the calibration of the strong gearComprises the following steps: the air intake of the range hood is 10-15m3Between/min; the calibration of the T gear is as follows: the air intake of the range hood is more than 15m3Min; because gear (intake) and electric current have one-to-one corresponding relation, then measuring the current value and can reflecting the intake, weak shelves, strong shelves, the switching of T fender mainly rely on the current value that detects, and the laboratory measures: the critical current for switching between the weak gear and the strong gear is 0.4A (i.e. I)Weak (weak)0.4A), and the critical current for switching the strong gear and the T gear is 0.8A (i.e. I)High strength0.8A), different fume exhaustors can have different IWeak (weak)、IHigh strength；
4) Detecting the corresponding real-time negative pressure value P of the air intake assembly 42 with the air intake passage 4222 in the open state1And P2Wherein P is1Is the negative pressure value at the air intake assembly 42 positioned at the left side (here, the left side does not define the leftmost one of the three air intake assemblies 42, but means the one positioned at the left side from the beginning, i.e., the left side when the left side and the middle are opened, the left side when the middle and the right side are opened, the middle when the middle and the right side are opened, and the left side when the left side and the right side are opened), P2A negative pressure value at the air intake assembly 42 located at the right side (here, the right side does not define the rightmost one of the three air intake assemblies 42, but means the one located at the right side from the beginning, i.e., the left side and the middle are middle when opened, the middle and the right side are right when opened, and the left side and the right side are right when opened);
5) the opening area (air intake area) of the air intake assembly 42 in the open state of the air intake passage 4222 is distributed, and the area of the air intake passage 4222 on the left side is (P)1/(P1+P2) A, the right air inlet passage 4222 has an area of (P)1/(P1+P2) A); the negative pressure at the air inlet channels 4222 is kept consistent to form uniform negative pressure distribution, so that energy is saved, the utilization rate is improved, the uniform negative pressure distribution is realized, the air flow disturbance is reduced, and the noise is reduced;
6) according to the distribution principle, the second movement mechanism 4241 is started to drive the rotary blade 422 to rotate, so that the air inlet passage 4222 is adjusted to a corresponding area;
7) when the smoke concentration sensors 92 corresponding to the air inlet components 42 on the left side and the right side detectTo real-time oil smoke concentration value QLeft side of＝0、QRight sideIf the result is 0, or the shutdown key is pressed, the range hood finishes working, otherwise, the step 2) is returned to.
According to the structure and the movement mode of the smoke baffle plate component 4, under the opening state of the smoke baffle plate 41, the smoke baffle plate can be combined with the two side plates 12 of the shell 1 to form a cigarette-making cavity, so that the cigarette-making performance is improved; the air inlet part is integrated with the smoke baffle 41: the air inlet is adjusted by simplifying parts (equivalent to reducing a movement mechanism of the smoke baffle part) or solving the parts as the smoke baffle movement mechanism; the motion form that keeps off cigarette board 41 and stretch out can avoid beating the pot risk, and it is more wide to keep off cigarette board 41 and open the visual angle, reduces the vision oppression, promotes user experience. Adjust the air inlet area through air inlet subassembly 42, 1) effective utilization air inlet area (the air intake of the side of not using is closed in the discernment of oil smoke concentration sensor 92 before the work, and negative pressure sensor 91 detects oil smoke size dynamic distribution oil air inlet area in the work), the additional action that brings: not only saves energy, but also prevents oil smoke from escaping (which can be understood as useful work improvement of the range hood); 2) and (3) wind speed lifting: when the oil smoke lasts the increase, can further reduce the air inlet area, promote the wind speed, improve the smoking ability.
Claims (12)
1. The utility model provides a range hood, includes casing (1) and keeps off cigarette subassembly (4), the front side of casing (1) is opened and is equipped with opening (131), keep off cigarette subassembly (4) including set up in opening (131) department, thereby can open or close cigarette board (41) that keep off of opening (131), its characterized in that: the smoke baffle plate (41) can be in a state of closing the opening (131) or in a state of opening the opening (131) by turning the lower end of the smoke baffle plate upwards into the shell (1), and the smoke baffle plate component (4) also comprises an air inlet component (42) which is arranged on the smoke baffle plate (41) and can enable oil smoke to flow through and enter the shell (1);
the air inlet assembly (42) comprises at least two rotating blades (422) arranged along the circumferential direction, two sides of the adjacent rotating blades (422) are attached to each other in the circumferential direction, the end parts of the rotating blades (422) towards the middle form a circular air inlet channel (4222), each rotating blade (422) is outwards and gradually increased in width from the end part towards the middle, and the rotating blades (422) can translate and rotate so that the air inlet channel (4222) is expanded or reduced, and therefore the air inlet area is adjusted.
2. The range hood of claim 1, wherein: casing (1) is including front panel (13) that is located the front side, opening (131) are seted up on front panel (13), range hood is still including first motion (8) that are used for driving fender cigarette board (41) upset, linear drive module, pivot (83) and pivot support (84) of linear motion about first motion (8) includes the output, pivot support (84) set up in the position that keeps off cigarette board (41) and be close to the lower extreme, pivot (83) set up on pivot support (84), rotate with the output of linear drive module and be connected, pivot (83) extend in the direction of controlling, keep off the upper end and front panel (13) sliding fit of cigarette board (41).
3. The range hood of claim 2, wherein: the first movement mechanism (8) further comprises a sliding rail (85) and a sliding groove (86), the sliding rail (85) is arranged at the position, close to the front end, of the smoke baffle plate (41), and the sliding groove (86) which is in sliding fit with the sliding rail (85) is formed in the front panel (13) in a manner that the opening (131) is upwards sunken and extends.
4. The range hood of claim 3, wherein: one side of the sliding rail (85) far away from the smoke baffle plate (41) is open, a guide part (861) is arranged in the sliding groove (86), the guide part (861) extends downwards from the end part of the sliding groove (86) far away from the opening (131), the tail end of the guide part (861) is arranged in the sliding rail (85), rolling connection is achieved between the guide part (861) and the sliding rail (85) through a rolling bearing (862), and the rotating shaft of the rolling bearing (862) extends in the left-right direction; the left side and the right side of the open end of the slide rail (85) are respectively bent towards the middle to form flanging (851) which can clamp the rolling bearing (862) in the slide rail (85).
5. The range hood of claim 2, wherein: first motion (8) are still including setting up first actuating mechanism (81) and second drive mechanism (82) in casing (1), first actuating mechanism (81) and second drive mechanism (82) constitute sharp drive module, first actuating mechanism (81) are the motor, second drive mechanism (82) are including lead screw (821) and sleeve (822) that extend in vertical direction, sleeve (822) cover is established on lead screw (821) and threaded connection, pivot (83) and sleeve (822) rotate the connection.
6. The range hood according to any one of claims 1 to 5, wherein: the air inlet assembly (42) further comprises a bottom plate (421) and a rotating plate (423) arranged on the front side of the bottom plate (421), the rotating blades (422) are arranged between the bottom plate (421) and the rotating plate (423), the bottom plate (421) is fixed on the smoke baffle (41), a first circular air inlet (4211) is formed in the bottom plate (421), and each rotating blade (422) is in sliding fit with the bottom plate (421); a second air inlet (4231) is formed in the middle of the rotating plate (423), the second air inlet (4231) corresponds to the first air inlet (4211), and each rotating blade (422) is in sliding and rotating fit with the rotating plate (423); the rotating plate (423) can rotate around the center of the second air inlet (4231), so that the rotating blade (422) is driven to translate and rotate.
7. The range hood of claim 6, wherein: first guide rail grooves (4212) with the same number as the rotary blades (422) are formed in the surface, facing the rotary plate (423), of the bottom plate (421), each first guide rail groove (4212) is tangent to the first air inlet (4211), a guide rail bar (4223) is arranged on one side, facing the bottom plate (421), of each rotary blade (422), and the guide rail bar (4223) is slidably arranged in the first guide rail groove (4212), so that the rotary blades (422) are in sliding fit with the bottom plate (421); the rotating plate (423) is also provided with second guide rail grooves (4232) on the periphery of the second air inlet (4231), the number of the second guide rail grooves (4232) is the same as that of the rotating blades (422), the second guide rail grooves (4232) are distributed radially, each second guide rail groove (4232) extends in an arc shape from one end close to the second air inlet (4231) to the direction far away from the second air inlet (4231), and the bending directions of the second guide rail grooves (4232) are consistent; one end of each rotating blade (422) far away from the middle is connected with a second guide rail groove (4232) through a first bolt (4221), and the first bolt (4221) is connected with the second guide rail groove (4232) in a sliding mode and can rotate along the axis of the rotating blade relative to the second guide rail groove (4232) at the same time, so that the rotating blade (422) is matched with the rotating plate (423) in a sliding and rotating mode.
8. The range hood of claim 6, wherein: the air inlet assembly (42) further comprises a second movement mechanism (424), the second movement mechanism (424) is arranged on one side, facing the inside of the shell (1), of the bottom plate (421), the second movement mechanism (424) comprises a second driving mechanism (4241) and a second transmission mechanism (4242), the second transmission mechanism (4242) comprises a crank (42421) and a connecting rod (42422) which are driven by the second driving mechanism (4241) to rotate, one end of the connecting rod (42422) and one end, far away from the second driving mechanism (4241), of the crank (42421) are connected in a rotating mode, the other end of the connecting rod is connected with the rotating plate (423) through a second bolt (4243), a third guide rail groove (4213) is further formed in the periphery of the first guide rail groove (4212) on the bottom plate (421), the third guide rail groove (4213) is arc-shaped and is arranged concentrically with the first air inlet (4211), and the second bolt (4243) penetrates through the third guide rail groove (4213) to be connected with the connecting rod (42422) and the connecting rod (42423) respectively, the second bolt (4243) is fixedly connected with the rotating plate (423) and is rotatably connected with the connecting rod (42422).
9. The range hood according to any one of claims 1 to 5, wherein: still including negative pressure sensor (91) and oil smoke concentration sensor (92) that are used for controlling air intake duct (4222) to adjust, negative pressure sensor (91) set up in bottom plate (421) towards one side in casing (1), be located the edge of first air intake (4211), oil smoke concentration sensor (92) set up in keeping off one side that cigarette board (41) were towards casing (1).
10. The range hood of claim 9, wherein: the air inlet components (42) comprise three air inlet components, wherein one air inlet component (42) is positioned in the middle of the smoke baffle (41), and the other two air inlet components are respectively positioned at the left side and the right side of the air inlet component (42).
11. The range hood according to any one of claims 1 to 5, wherein: the air inlet components (42) comprise three air inlet components, wherein one air inlet component (42) is positioned in the middle of the smoke baffle (41), and the other two air inlet components are respectively positioned at the left side and the right side of the air inlet component (42).
12. A control method of a range hood according to claim 10, said range hood further comprising a fan system (3), characterized in that: the control method comprises the following steps:
1) starting the range hood, and turning over and opening the smoke baffle plate (41);
2) the oil smoke concentration sensors (92) corresponding to the air inlet components (42) on the left side and the right side detect the real-time oil smoke concentration Q, judge whether the stove burner below the range hood is opened on two sides, and if Q is judgedLeft side of＞0，QRight side＞0，QLeft side of、QRight sideRespectively detecting the real-time oil smoke concentrations of the left side and the right side, controlling the air inlet components (42) of the left side and the right side to open an air inlet channel (4222), wherein the opening area is 1/2A, A is the maximum area of the air inlet channel (4222), and entering the step 3); if Q isLeft side of＞QRight sideIf the value is 0, the left furnace end is started, the air inlet components (42) on the left side and the middle are controlled to open the air inlet channel (4222), the opened area is 1/2A, and the step 3 is carried out; if Q isRight side＞QLeft side ofIf the value is 0, the right furnace end is started, the air inlet components (42) on the right side and the middle are controlled to open the air inlet channel (4222), the opened area is 1/2A, and the step 3 is carried out;
3) detect the real-time backpressure current I of the motor of the fan system (3) of range hood, switch the gear of fan system (3): if I < IWeak (weak)The fan system (3) is switched to a weak gear if IWeak (weak)＜I＜IHigh strengthThe fan system (3) is switched to a strong gear if I is larger than IHigh strengthThe fan system (3) is switched to a T gear IWeak (weak)、IHigh strengthThe two values are preset gear switching critical values; the gears of the weak gear, the strong gear and the T gear are gradually increased;
4) detecting real-time negative pressure value P at the corresponding air inlet component (42) of which the air inlet channel (4222) is in an open state1And P2，P1Is the negative pressure value P of the air inlet component (42) positioned at the left side in the two opened air inlet components (42)2The negative pressure value of the air inlet component (42) positioned on the right side in the two opened air inlet components (42) is obtained;
5) the air inlet area of the air inlet channel (4222) is distributed, and the area of the air inlet channel (4222) positioned on the left side in the two opened air inlet components (42) is (P)1/(P1+P2) A, the area of the air inlet channel (4222) positioned at the right side in the two opened air inlet assemblies (42) is (P)1/(P1+P2))*A；
6) Adjusting the two air inlet channels (4222) to corresponding areas according to the distribution principle of the step 5);
7) when the oil smoke concentration sensors (92) corresponding to the air inlet components (42) at the left side and the right side detect the real-time oil smoke concentration value QLeft side of＝0、QRight sideWhen the machine closing key is pressed, the range hood finishes working; otherwise, go back to step 2).
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| CN111750402A (en) * | 2020-07-20 | 2020-10-09 | 青岛海信电子产业控股股份有限公司 | Range hood and control method thereof |
| CN112344405B (en) * | 2020-10-16 | 2024-06-18 | 宁波方太厨具有限公司 | Smoke baffle assembly and range hood with same |
| CN113983818A (en) * | 2021-09-22 | 2022-01-28 | 拓正化工工程(上海)有限公司 | Health care and predictive maintenance system for industrial furnace equipment |
| CN114228847B (en) * | 2021-12-27 | 2023-03-28 | 上海智能网联汽车技术中心有限公司 | Active opening and closing type automobile tail wing |
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