CN113217971A - Range hood and control method thereof - Google Patents
Range hood and control method thereof Download PDFInfo
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- CN113217971A CN113217971A CN202110599609.5A CN202110599609A CN113217971A CN 113217971 A CN113217971 A CN 113217971A CN 202110599609 A CN202110599609 A CN 202110599609A CN 113217971 A CN113217971 A CN 113217971A
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- 238000000034 method Methods 0.000 title claims description 11
- 230000007704 transition Effects 0.000 claims abstract description 74
- 239000000779 smoke Substances 0.000 claims abstract description 72
- 230000003068 static effect Effects 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims description 55
- 230000005540 biological transmission Effects 0.000 claims description 21
- 230000033001 locomotion Effects 0.000 claims description 16
- 230000001603 reducing effect Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 6
- 230000002829 reductive effect Effects 0.000 abstract description 23
- 238000009792 diffusion process Methods 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 6
- 230000000391 smoking effect Effects 0.000 description 6
- 238000010411 cooking Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 235000019504 cigarettes Nutrition 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 230000005465 channeling Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- F24C15/2035—Arrangement or mounting of filters
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Abstract
The invention discloses a range hood, which comprises a fan frame and a fan system arranged in the fan frame, and also comprises an upper box body, a middle box body and a lower box body which are hollow, wherein the upper box body is arranged below the fan frame and internally forms a static pressure cavity; the sizes of the static pressure cavity and the dynamic pressure cavity in the front and back directions are larger than those of the transition cavity. Compared with the prior art, the invention has the advantages that: the oil smoke gas flow can enter the middle box body for transition after reaching the lower box body for diffusion, and the dynamic pressure reduces the static pressure and increases the static pressure to enter the upper box body, so that the flow loss is reduced, the noise is reduced, and the efficiency of the fan 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
Chinese cooking can generate a large amount of oil smoke, and in order to keep the kitchen environment clean and the human health, the range hood becomes one of indispensable kitchen household appliances in modern families. The range hood generally comprises a top suction type range hood and a side suction type range hood, and the top suction type range hood has more and more extensive application due to the advantages of being neat and light, small in occupied space, good in matching with a hanging cabinet, low in noise and the like.
The top-suction type range hood generally comprises a smoke collecting hood and a fan frame positioned on the smoke collecting hood, wherein a volute, an impeller and a motor for driving the impeller are installed in the fan frame, and an air inlet is arranged in the center of the smoke collecting hood and is directly connected with a high negative pressure area where the fan is located. The range hood has the problems of high wind speed and negative pressure at the air inlet of the smoke collecting hood and large negative pressure attenuation at the position far away from the air inlet. The stove burner used during cooking is usually arranged on the left side and the right side under the range hood, and the oil smoke has diffusion phenomenon in the rising process, so that the range hood has poor smoking effect and the phenomenon of oil smoke escape frequently occurs. And certain flow loss exists in the flowing process of the oil smoke gas flow in the internal flow passage of the range hood.
In addition, the common top-suction range hood is usually suspended and flush with the hanging cabinet, the fan frame can be hidden in the hanging cabinet after the door of the hanging cabinet is closed, the depth of the smoke collecting hood is usually 500 mm-550 mm, and the depth of the standard hanging cabinet is 350mm or 370 mm. Therefore, the fume collecting hood usually extends out of the hanging cabinet and is not beautiful. And the wall cupboard is usually installed higher, so the range hood is also usually installed higher, and the oil smoke exists and rises the diffusion phenomenon, and the higher the rising is, the scope of diffusion is bigger, so the range hood needs bigger collection petticoat pipe to cage the cigarette if hanging high and prevent that the oil smoke from escaping.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a range hood, which can improve the range hood effect by reducing the gas flow loss, in view of the above-mentioned deficiencies in the prior art.
The second technical problem to be solved by the present invention is to provide a control method for the above range hood.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a range hood, includes fan frame and the fan system of setting in the fan frame, its characterized in that: the range hood also comprises an upper box body, a middle box body and a lower box body which are hollow, the upper box body is arranged below the fan frame, a static pressure cavity is formed inside the upper box body, the bottom of the rear side of the upper box body is connected with the top of the middle box body, a transition cavity is formed inside the middle box body, the bottom of the middle box body is connected with the top of the rear side of the lower box body, a dynamic pressure cavity is formed inside the lower box body, an air inlet communicated with the dynamic pressure cavity is formed in the bottom plate of the lower box body, the dynamic pressure cavity is communicated with the transition cavity through fluid, the transition cavity is communicated with the static pressure cavity through fluid, and the static pressure cavity is communicated with fluid in the fan frame; the sizes of the static pressure cavity and the dynamic pressure cavity in the front and back direction are larger than those of the transition cavity.
According to one aspect of the invention, in order to further reduce dynamic pressure and increase static pressure, so that air flow operation is more stable, flow loss is reduced, wind can be blown farther, and noise is lower, a pressure expanding plate is arranged in a transition cavity in the middle box body, the upper end of the pressure expanding plate is connected with the front side in the middle box body, and the pressure expanding plate is gradually inclined backwards from top to bottom, so that the transition cavity is in a structure with a small bottom and a large top.
According to another aspect of the invention, a pressure expanding plate is arranged in the transition cavity in the middle box body, the upper end of the pressure expanding plate is rotatably connected with the front part of the inner side of the middle box body, and a rotating shaft of the pressure expanding plate extends in the left-right direction, so that the pressure expanding plate can turn back and forth around the connection part with the middle box body.
In order to automatically control the turnover of the pressure expansion plate, the range hood further comprises a movement mechanism for driving the pressure expansion plate to turn.
Preferably, the movement mechanism comprises a driving mechanism and a transmission mechanism, the driving mechanism is a linear driving module capable of pushing the transmission mechanism to move back and forth, and the transmission mechanism is connected with the lower end of the pressure expansion plate.
In order to facilitate the synchronous change of the air inlet areas of the transition cavity inlet and the air inlet, so that the air speeds of the transition cavity inlet and the air inlet are the same, the transmission mechanism comprises a first connecting plate, a second connecting plate and a third connecting plate, the first connecting plate is attached to the top of the inner side of the lower box body and transversely extends, the rear end of the first connecting plate is rotatably connected with the lower end of the pressure expansion plate, the front end of the first connecting plate extends into the lower box body, the second connecting plate longitudinally extends in the lower box body, the upper end of the second connecting plate is connected with the front end of the first connecting plate, the third connecting plate transversely extends in the lower box body and is attached to the bottom of the inner side of the lower box body, the rear end of the third connecting plate is connected with the lower end of the second connecting plate, the first connecting plate and the pressure expansion plate of the transmission mechanism can change the inlet area of the transition cavity, and the third connecting plate can change the area of the air inlet.
In order to avoid the pollution of the driving mechanism by oil smoke, the driving mechanism is positioned on the front side of the second connecting plate, and the output end of the driving mechanism is connected with the second connecting plate.
In order to automatically control the turnover of the pressure expansion plate according to the oil smoke concentration and the wind speed, an oil smoke sensor is arranged on the outer side of the bottom of the lower box body, a wind speed sensor is arranged at the inlet of the transition cavity, and the oil smoke sensor and the wind speed sensor are used for controlling the movement mechanism.
For making to hold together the cigarette scope and sink, promote the oil absorption cigarette effect, the bottom integrated into one piece of lower box has the collection petticoat pipe, the collection petticoat pipe is upwards sunken and form by the bottom of lower box, the air intake is seted up on the collection petticoat pipe.
In order to facilitate the complete machine and the hanging cabinet to be better adapted, the front side of the fan frame is positioned behind the front side of the upper box body.
In order to put articles conveniently, the top of the lower box body is provided with an article-putting cover plate.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a control method of the range hood comprises the following steps:
1) starting a fan system;
2) the lower end of the pressure expanding plate is driven to move forwards by the motion mechanism, and the air inlet areas of the air inlet and the transition cavity are gradually increased;
3) detecting whether the wind speed reaches a wind speed threshold value through a wind speed sensor, and then carrying out corresponding operation according to the detected wind speed:
3.1) if the wind speed is smaller than the wind speed threshold, the moving mechanism drives the lower end of the pressure expansion plate to move backwards for a certain distance, and the step 3) is returned;
3.2) if the wind speed is larger than the wind speed threshold value, returning to the step 2);
3.3) if the wind speed is equal to the wind speed threshold, detecting the oil smoke concentration by using an oil smoke sensor, and then carrying out corresponding operation according to the detected oil smoke concentration:
3.3.1) if the oil smoke concentration is less than the oil smoke concentration threshold value, reducing the rotating speed of the fan system, reducing the wind speed measured by the wind speed sensor, driving the lower end of the pressure expanding plate to move forwards by the motion mechanism, and reducing the air inlet areas of the air inlet and the transition cavity until the wind speed is maintained to the design value;
3.3.2) if the oil smoke concentration is larger than the oil smoke concentration threshold value, the rotating speed of the fan system is increased, the lower end of the pressure expansion plate is driven by the moving mechanism to move backwards, and the air inlet areas of the air inlet and the transition cavity are expanded until the air speed is maintained to the design value;
3.3.3) if the concentration is equal to the threshold value of the oil smoke concentration, returning to the step 3.3).
Compared with the prior art, the invention has the advantages that: by arranging the upper box body, the middle box body and the lower box body, the size of the middle box body is minimum, so that oil smoke gas flow can enter the middle box body for transition after reaching the lower box body for diffusion, and dynamic pressure enters the upper box body with reduced static pressure and increased static pressure, so that the flow loss is reduced, the noise is reduced, the fan efficiency is improved, and the oil smoke absorption effect is improved; the expansion plate is arranged in the transition cavity of the middle box body, so that the air inlet area of the transition cavity is gradually increased from bottom to top, the dynamic pressure is further gradually reduced from bottom to top, the static pressure is gradually increased from bottom to top, the air flow operation is more stable, the flow loss is reduced, the air can be blown farther, and the noise is lower; the diffuser plate can be arranged in a turnover mode and can be adjusted according to the oil smoke concentration and the air speed, so that the diffuser plate is located at a proper position, and the good matching of the air speed and the rotating speed of the fan is ensured; the smoke gathering area formed in the smoke gathering cover sinks, so that the smoke gathering cover is closer to a smoke source, and the oil smoke absorption effect is improved.
Drawings
Fig. 1 is a schematic view of a range hood according to a first embodiment of the present invention;
fig. 2 is a schematic view of a range hood according to a first embodiment of the present invention;
fig. 3 is a cross-sectional side view (front-rear cross section) of a range hood according to a first embodiment of the present invention;
fig. 4 is a sectional view (left-right direction section) of a range hood according to a first embodiment of the present invention;
fig. 5 is a schematic view of a range hood according to a second embodiment of the present invention;
fig. 6 is a partial cross-sectional view of a range hood in accordance with a second embodiment of the present invention;
fig. 7 is a schematic view of a range hood in a first state according to a second embodiment of the present invention;
fig. 8 is a schematic view of a range hood in a second state according to a second embodiment of the present invention;
fig. 9 is a schematic view of a range hood in a third state according to a second embodiment of the present invention;
fig. 10 is a control flow chart of a range hood according to a second 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.
Example one
Referring to fig. 1 to 4, a range hood includes an upper box 1, a middle box 2, a lower box 3 and a fan frame 4, wherein the upper box 1 is disposed under the fan frame 4, and the left and right length of the upper box is greater than that of the fan frame 4. The upper box body 1, the middle box body 2 and the lower box body 3 are all hollow box bodies. The bottom of the rear side of the upper box body 1 is connected with the top of the middle box body 2, the bottom of the middle box body 2 is connected with the top of the rear side of the lower box body 3, the upper box body 1 and the middle box body 2 and the lower box body 3 are mutually communicated in a fluid mode, and the upper box body 1 is communicated with the air frame 4 in a fluid mode. The sizes of the upper box body 1 and the lower box body 3 in the front and back direction are larger than that of the middle box body 2, the middle box body 2 is a box body with a thin structure in the front and back direction, namely, the sectional area is reduced when the lower box body 3 is transited to the middle box body 2, and the sectional area is increased when the middle box body 2 is transited to the upper box body 1. A fan system 8 is arranged in the fan frame 4.
The front side of fan frame 4 is located the rear of the front side of last box 1, and the distance between the front side of fan frame 4 and the front side of last box 1 is A, and is preferred, and the value range of A is 15 ~ 30 mm. After the range hood is installed, the fan frame 4 is hidden on the back of the hanging cabinet, the front part of the upper box body 1 is flush with a door plate of the hanging cabinet, and the top of the upper box body 1 can be used as a bottom plate of the hanging cabinet, so that the range hood is matched with the hanging cabinet with good appearance consistency.
The bottom of lower box 3 is provided with collection petticoat pipe 5, and collection petticoat pipe 5 is upwards sunken and form by the bottom of lower box 3, but lower box 3 and collection petticoat pipe 5 integrated into one piece. An air inlet 51 is formed in the smoke collecting hood 5, and the air inlet 51 enables the interior of the lower box body 3 to be communicated with the outside fluid. In the present embodiment, the smoke collecting hood 5 has two, and is arranged at intervals in the left-right direction.
The top of the lower box body 3 is provided with a storage cover plate 6 which can be used as a storage table top.
The interior of the lower box body 3 forms a dynamic pressure cavity Q1, the interior of the middle box body 2 forms a transition cavity Q2, and the interior of the upper box body 1 forms a static pressure cavity Q3. The dynamic pressure cavity Q1 is in fluid communication with the air inlet 51, so that the air speed at the air inlet 51 can be improved, and the oil smoke absorption effect can be effectively ensured. The above-described upper case 1 and lower case 3 are larger in both the front and rear directions than the intermediate case 2 means that the static pressure chamber Q3 and dynamic pressure chamber Q1 are larger in both the front and rear directions than the transition chamber Q2.
Be provided with diffuser plate 7 in the inside transition chamber Q2 of middle box 2, the upper end and the inside front side of middle box 2 of diffuser plate 7 are connected, and diffuser plate 7 inclines backward gradually from top to bottom to make transition chamber Q2 be big-end-up's structure. The air inlet area of the air inlet 51 of the smoke collecting hood 5 is equal to the area of the inlet of the transition cavity Q2 (the inlet of the transition cavity Q2 refers to the communication part of the transition cavity Q2 and the dynamic pressure cavity Q1), so that the flow rate of the air inlet 51 is equal to the flow rate of the inlet of the transition cavity Q2.
When oil smoke enters the dynamic pressure cavity Q1 through the air inlet 51, then rapidly flows to the rear part of the dynamic pressure cavity Q1 and enters the transition cavity Q2, because the transition cavity Q2 is of a structure with a small lower part and a large upper part, according to a fluid continuity equation, Q is V S, wherein Q is air volume, V is flow velocity, S is sectional area, when the air volume Q is constant, the flow velocity V is related to the sectional area S, and the larger S is, the smaller V is. In the transition cavity Q2, the cross-sectional area S of the fluid from bottom to top is gradually increased, that is, the wind speed V is maximum at the inlet of the transition cavity Q2, and is minimum at the outlet (the outlet of the transition cavity Q2 refers to the communication part of the transition cavity Q2 and the static pressure cavity Q3), and the cross-sectional area S of the fluid from bottom to top is gradually decreased. Further, according to bernoulli's equation, P +1/2 ρ V2+ ρ gh is known as C, where C is a constant, and since the air density in the transition cavity Q2 is low and the transition cavity height Q2 degree is short, the air gravitational potential energy ρ gh thereof is negligible, and since it is already found that the wind speed V in the transition cavity Q2 is gradually reduced, it can be found that the pressure P in the transition cavity Q2 gradually increases from bottom to top without changing the gear of the fan system 8 and considering the on-way resistance. That is, according to the bernoulli principle, in the transition chamber Q2 of the present invention, the dynamic pressure gradually decreases from bottom to top, and the static pressure gradually increases from bottom to top. The static pressure is increased by reducing the dynamic pressure, so that the air flow operation is more stable, the flow loss is reduced, the wind can be blown farther, and the noise is lower. Finally, the air flow enters the static pressure cavity Q1 through the transition cavity, then enters the fan system 8, and is discharged to the outside through the fan system 8.
During cooking, the oil smoke has physical phenomena of frying, rising and diffusion, and is captured in the rising stage, so that the area of a smoke cavity of the cage can be reduced, and a better smoking effect is achieved. Adopt the range hood of above-mentioned structure, when range hood fan installation looks co-altitude, collection petticoat pipe 5 compares traditional collection petticoat pipe's position lower, can catch the oil smoke in advance before the oil smoke spreads by a wide margin, and two collection petticoat pipes 5 about the lower surface of lower box 3 is provided with, correspond two furnace ends about the cooking utensils respectively, reduce the weak degree of negative pressure of both sides, further promote the smoking effect.
Example two
Referring to fig. 5 and 6, the difference from the first embodiment is that the diffuser plate 7 can be adjusted in inclination angle with respect to the intermediate case 2. Because the range hood has different gears, namely the air volume is different under different gears, the sectional area of the surface of the transition cavity Q2 can be adjusted by adjusting the diffuser plate 7, namely the air speed in the transition cavity Q2 can be adjusted under different air volumes.
The range hood also comprises a movement mechanism for driving the pressure expansion plate 7 to overturn. The moving mechanism includes a driving mechanism 91 and a transmission mechanism 92, and in this embodiment, the driving mechanism 91 is an electric push rod and is disposed in the lower case 3. The transmission mechanism 92 is a plate member and is rotatably connected to the lower end of the diffuser plate 7. The upper end of the pressure expanding plate 7 is rotatably connected with the front part of the inner side of the middle box body 2, and the rotating shaft of the pressure expanding plate 7 extends in the left-right direction. When the lower end of the pressure expanding plate 7 is pushed to move back and forth, the pressure expanding plate 7 can turn around the joint with the middle box body 2. In order to facilitate the stable movement of the transmission mechanism 92, the transmission mechanism 92 includes a first connection plate 921, a second connection plate 922, and a third connection plate 923, and the first connection plate 921, the second connection plate 922, and the third connection plate 923 are preferably integrally formed. Wherein the first connecting plate 921 is extended transversely closely to the top of the inner side of the lower case 3, preferably the first connecting plate 921 is horizontal, the rear end of the first connecting plate 921 is rotatably connected with the lower end of the diffuser plate 7, and the front end is extended to the inside of the lower case 3. The second connection plate 922 extends longitudinally in the lower case 3, preferably the second connection plate 922 is vertical, and the upper end of the second connection plate 922 is connected to the front end of the first connection plate 921. The third connecting plate 923 extends transversely in the lower box 3, and preferably the third connecting plate 923 is horizontal, and is supported on the bottom of the inner side of the lower box 3 slidably, and clings to the bottom of the inner side of the lower box 3, and the rear end of the third connecting plate 923 is connected with the lower end of the second connecting plate 922. The output end of the driving mechanism 91 is connected to the second connecting plate 922, so that the transmission mechanism 92 can be pushed to move back and forth. Alternatively, the driving mechanism 91 may also adopt other linear driving modules capable of outputting linear motion, such as a combination of a motor and a gear rack, a combination of a motor and a screw nut, and the like.
Through the arrangement of the transmission mechanism 92, the first connecting plate 921 and the pressure expansion plate 7 are used for changing the area of the inlet of the transition chamber Q2, the third connecting plate 923 is used for changing the area of the air inlet 51, the area of the inlet of the transition chamber Q2 and the area of the air inlet 51 of the smoke collecting hood 5 are increased or decreased in the same ratio, that is, when the air speed at the inlet of the transition chamber Q2 is increased or decreased, the air speed at the air inlet 51 of the smoke collecting hood 5 is also increased or decreased simultaneously. The inlet of the transition cavity Q2 refers to the transition between the transition cavity Q2 and the dynamic pressure cavity Q1.
During the movement of the moving mechanism, the ventilation area of the inlet of the transition cavity Q2 is always equal to the ventilation area of the air inlet 51 of the smoke collecting cover 5. For this reason, in the present embodiment, only one smoke collecting hood 5 is provided, and the movement of the third connecting plate 923 can synchronously change the air inlet area of the air inlet 51, so that the air inlet area of the inlet of the transition chamber Q2 is always the same as the area of the air inlet 51 of the smoke collecting hood 5, that is, the same wind speed is ensured at the two places. The driving mechanism 91 is located at the front side of the second connecting plate 922, so that the driving mechanism 91 is always in a closed environment to prevent oil pollution.
In order to automatically control the movement mechanism, the outer side of the bottom of the lower box body 3 is provided with a lampblack sensor 10, and an air speed sensor 11 is arranged at an inlet of the transition cavity Q2.
Referring to fig. 7, after cooking is finished, the transmission mechanism 92 moves backwards to enable the lower end of the pressure expansion plate 7 to move to the position of the rearmost side, the transition cavity Q2 and the dynamic pressure cavity Q1 are isolated, the transition cavity Q2 is completely closed, smoke backflow and odor channeling can be effectively reduced, and residual oil smoke odor in the fan system 8 is reduced from being emitted into a kitchen.
Referring to fig. 8, at this time, the transmission mechanism 92 is moved forward by a certain distance from the position of fig. 7, and the diffuser plate 7 is turned forward by a certain angle so that the lower end of the diffuser plate 7 is separated from the rearmost side of the intermediate case 2, and the transition chamber Q2 is partially opened.
Referring to fig. 9, at this time, the transmission mechanism 92 continues to move forward from the position of fig. 8 until the lower end of the diffuser plate 7 moves to the most forward position in the middle box 2, the transition chamber Q2 is fully opened, the cross-sectional area of the upper and lower sides of the transition chamber Q2 is equal, that is, the wind speed is kept constant during the flowing process.
When the oil smoke volume is great, the high gear of the range hood is manually started, so that the air volume is improved, and the effect of the range hood is met. When the high gear is started, the electric push rod is contracted, the transmission mechanism 92 moves forwards, on one hand, the negative pressure area of the air inlet 51 of the fume collecting hood 5 is enlarged, and on the other hand, the air speed is properly reduced to reduce the noise of the range hood. Because of the reducing effect of the transition section Q2, the flow loss is reduced and the noise is further reduced.
When the oil smoke volume is smaller, the low gear of the range hood is started. When starting low gear, electric putter extends, and drive mechanism 92 moves backward, makes the air intake 51 and the imported area of transition chamber Q2 of collection petticoat pipe 5 reduce, and then makes the air inlet wind speed increase and promotes the smoking effect, again because the reducing effect of transition chamber Q2 makes flow loss reduce, and the noise reduces.
When the range hood is shut down, the electric push rod extends, and the transmission mechanism 92 moves backwards until the transition cavity Q2 is sealed, so that the peculiar smell of the oil smoke in the fan system 8 is prevented from diffusing to the kitchen, and the smell of the smoke in the public flue is prevented from channeling.
Specifically, referring to fig. 10, the method for controlling a range hood in the present embodiment includes the following steps:
1) after the automatic regulating program is started, the fan system 8 is started;
2) the electric push rod retracts (the shutdown state is the extension state), the air inlet areas of the air inlet 51 and the transition cavity Q2 are gradually increased in the retracting process, and the air speed is changed from fast to slow;
3) detecting whether the wind speed reaches a wind speed threshold value by using a wind speed sensor 11, and then performing corresponding operations according to the detected wind speed:
3.1) if the wind speed is smaller than the wind speed threshold, extending the electric push rod for a certain distance, and returning to the step 3);
3.2) if the wind speed is larger than the wind speed threshold value, returning to the step 2);
3.3) if the wind speed is equal to the wind speed threshold, detecting the oil smoke concentration by using an oil smoke sensor 10, and then carrying out corresponding operation according to the detected oil smoke concentration:
3.3.1) if the oil smoke concentration is smaller than the oil smoke concentration threshold value, the oil smoke amount is less, the rotating speed of the fan system 8 is reduced, the noise is reduced, after the rotating speed of the fan system 8 is reduced, the air volume is reduced, the air speed measured by the air speed sensor 11 is reduced, and in order to ensure that the smoking effect is not weakened, the electric push rod is extended, and the air inlet areas of the air inlet 51 and the transition cavity Q2 are reduced until the air speed is maintained to the design value;
3.3.2) if the oil smoke concentration is larger than the oil smoke concentration threshold value, indicating that the oil smoke amount is larger, increasing the rotating speed of the fan system 8 to increase the air volume, increasing the air volume, and synchronously increasing the air speed, shortening the electric push rod, enlarging the air inlet areas of the air inlet 51 and the transition cavity Q2, improving the smoking effect, and stabilizing the air speed to the design value;
3.3.3) if the concentration is equal to the threshold value of the oil smoke concentration, returning to the step 3.3).
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 (12)
1. The utility model provides a range hood, includes fan frame (4) and sets up fan system (8) in fan frame (4), its characterized in that: the range hood further comprises an upper box body (1), a middle box body (2) and a lower box body (3), wherein the upper box body (1) is arranged below the fan frame (4) and internally forms a static pressure cavity (Q3), the bottom of the rear side of the upper box body (1) is connected with the top of the middle box body (2), a transition cavity (Q2) is formed inside the middle box body (2) and the bottom of the middle box body is connected with the top of the rear side of the lower box body (3), a dynamic pressure cavity (Q1) is formed inside the lower box body (3), an air inlet (51) communicated with a dynamic pressure cavity (Q1) is formed in a bottom plate of the lower box body (3), the dynamic pressure cavity (Q1) and the transition cavity (Q2) are communicated with each other, the transition cavity (Q2) and the static pressure cavity (Q3) are communicated with each other, and the static pressure cavity (Q3) is communicated with the fan frame (4); the static pressure cavity (Q3) and the dynamic pressure cavity (Q1) are larger than the transition cavity (Q2) in the front-back direction.
2. The range hood of claim 1, wherein: be provided with expand clamp plate (7) in the inside transition chamber (Q2) of middle box (2), the upper end and the inside front side of middle box (2) of expand clamp plate (7) are connected, expand clamp plate (7) and from top to bottom incline backward gradually to make transition chamber (Q2) be big-end-up's structure down.
3. The range hood of claim 1, wherein: be provided with in the inside transition chamber (Q2) of middle box (2) and expand clamp plate (7), the upper end of expanding clamp plate (7) then rotates with middle box (2) inboard front portion and is connected, and the axis of rotation of expanding clamp plate (7) extends in the left and right sides direction to expand clamp plate (7) and can overturn around the junction with middle box (2) front and back.
4. The range hood of claim 3, wherein: the range hood also comprises a movement mechanism for driving the pressure expansion plate (7) to overturn.
5. The range hood of claim 4, wherein: the movement mechanism comprises a driving mechanism (91) and a transmission mechanism (92), the driving mechanism (91) is a linear driving module capable of pushing the transmission mechanism (92) to move back and forth, and the transmission mechanism (92) is connected with the lower end of the pressure expansion plate (7).
6. The range hood of claim 5, wherein: the transmission mechanism (92) comprises a first connecting plate (921), a second connecting plate (922) and a third connecting plate (923), the top of the inner side of the box body (3) under the first connecting plate (921) is transversely extended, the rear end of the first connecting plate (921) is rotatably connected with the lower end of the pressure expansion plate (7) and the front end is extended into the lower box body (3), the second connecting plate (922) is longitudinally extended in the lower box body (3), the upper end of the second connecting plate (922) is connected with the front end of the first connecting plate (921), the third connecting plate (923) is transversely extended in the lower box body (3) and is tightly attached with the bottom of the inner side of the lower box body (3), the rear end of the third connecting plate (923) is connected with the lower end of the second connecting plate (922), the first connecting plate (921) and the pressure expansion plate (7) of the transmission mechanism (92) can change the inlet area of the transition cavity (Q2), the third connecting plate (923) can change the area of the air inlet (51).
7. The range hood of claim 6, wherein: the driving mechanism (91) is located on the front side of the second connecting plate (922), and the output end of the driving mechanism (91) is connected with the second connecting plate (922).
8. The range hood according to any one of claims 4 to 7, wherein: the oil smoke sensor (10) is arranged on the outer side of the bottom of the lower box body (3), the wind speed sensor (11) is arranged at the inlet of the transition cavity (Q2), and the oil smoke sensor (10) and the wind speed sensor (11) are used for controlling the movement mechanism.
9. The range hood according to any one of claims 1 to 7, wherein: the bottom integrated into one piece of lower box (3) has collection petticoat pipe (5), collection petticoat pipe (5) are upwards sunken and form by the bottom of lower box (3), air intake (51) are seted up on collection petticoat pipe (5).
10. The range hood according to any one of claims 1 to 7, wherein: the front side of the fan frame (4) is positioned behind the front side of the upper box body (1).
11. The range hood according to any one of claims 1 to 7, wherein: the top of the lower box body (3) is provided with an object placing cover plate (6).
12. A control method of a range hood as claimed in claim 8, comprising the steps of:
1) starting a fan system (8);
2) the lower end of the pressure expanding plate (7) is driven to move forwards by the movement mechanism, and the air inlet areas of the air inlet (51) and the transition cavity (Q2) are gradually increased;
3) whether the wind speed reaches a wind speed threshold value is detected through a wind speed sensor (11), and then corresponding operation is carried out according to the detected wind speed:
3.1) if the wind speed is smaller than the wind speed threshold, the moving mechanism drives the lower end of the pressure expanding plate (7) to move backwards for a certain distance and returns to the step 3);
3.2) if the wind speed is larger than the wind speed threshold value, returning to the step 2);
3.3) if the wind speed is equal to the wind speed threshold, detecting the oil smoke concentration by using an oil smoke sensor (10), and then performing corresponding operation according to the detected oil smoke concentration:
3.3.1) if the oil smoke concentration is smaller than the oil smoke concentration threshold value, reducing the rotating speed of the fan system (8), reducing the wind speed measured by the wind speed sensor (11), driving the lower end of the pressure expanding plate (7) to move forwards by the motion mechanism, and reducing the air inlet areas of the air inlet (51) and the transition cavity (Q2) until the wind speed is maintained to the design value;
3.3.2) if the oil smoke concentration is larger than the oil smoke concentration threshold value, the rotating speed of the fan system (8) is increased, the lower end of the pressure expanding plate (7) is driven by the moving mechanism to move backwards, and the air inlet areas of the air inlet (51) and the transition cavity (Q2) are expanded until the wind speed is maintained to the design value;
3.3.3) if the concentration is equal to the threshold value of the oil smoke concentration, returning to the step 3.3).
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| CN202110599609.5A CN113217971B (en) | 2021-05-31 | 2021-05-31 | Range hood and control method thereof |
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| CN113217971B (en) | 2023-11-17 |
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