CN111839255B - Air guide structure and baking cooking device with same - Google Patents
Air guide structure and baking cooking device with same Download PDFInfo
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- CN111839255B CN111839255B CN202010620820.6A CN202010620820A CN111839255B CN 111839255 B CN111839255 B CN 111839255B CN 202010620820 A CN202010620820 A CN 202010620820A CN 111839255 B CN111839255 B CN 111839255B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
- A47J37/0623—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity
- A47J37/0629—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity with electric heating elements
- A47J37/0641—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity with electric heating elements with forced air circulation, e.g. air fryers
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
- A47J37/0623—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity
- A47J37/0629—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity with electric heating elements
- A47J37/0635—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity with electric heating elements with reflectors
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
- A47J37/0623—Small-size cooking ovens, i.e. defining an at least partially closed cooking cavity
- A47J37/0664—Accessories
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Baking, Grill, Roasting (AREA)
Abstract
The invention relates to a wind guide structure and a baking cooking device thereof, comprising an exhaust passage with an exhaust fan, wherein the exhaust passage is provided with a gas inlet, a heat preservation cover and a temperature difference generating device electrically connected with the exhaust fan are arranged in the exhaust passage, the heat preservation cover covers the gas inlet, the wall of the cover is provided with a gas outlet communicated with the gas inlet, the temperature difference generating device is arranged on the heat preservation cover, the heat preservation cover is provided with a heat conduction surface, the cold end of the temperature difference generating device is opposite to the gas outlet of the exhaust fan, and the hot end of the temperature difference generating device is contacted with the heat conduction surface. The thermoelectric power generation device can automatically generate electric quantity supplied to the exhaust fan, can adaptively adjust the on-off of the power generation function according to the quantity of the exhaust air outside the inner container, and can keep a certain temperature difference between the cold end and the hot end of the thermoelectric power generation device along with the work of the exhaust fan after the thermoelectric power generation device starts generating power, so that the stable power generation of the thermoelectric power generation device can be realized, and the power generation efficiency is improved.
Description
Technical Field
The invention relates to the field of baking cooking devices, in particular to an air guide structure and a baking cooking device with the same.
Background
The cooking equipment with baking function such as electric oven, steaming and baking all-in-one machine, etc. is discharged the waste gas that toasts the in-process and produce through wind-guiding structure under operating condition, and current wind-guiding structure generally includes exhaust fan and exhaust passage, and wherein, exhaust passage is established on the upper mounting panel by the wind scooper cover and encloses with the upper surface of upper mounting panel and establish and form, and above-mentioned exhaust fan generally installs on exhaust passage's air intake. For example, chinese patent application No. CN201911042278.4 (publication No. CN110693338A) discloses an oven, which includes an inner container, a baking tray is horizontally disposed in the inner container, an exhaust port is disposed on a top plate of the inner container, and the exhaust port is in fluid communication with an exhaust channel having an exhaust fan. Further, the air guide structure is disclosed in chinese patent application No. CN201911042281.6 (publication No. CN110693343A), chinese patent application No. cn201911042252.x (publication No. CN110840279A), and the like.
When the cooking equipment starts to work, the exhaust fan starts to rotate, the motor of the exhaust fan is powered by the power panel of the cooking equipment to occupy partial power of the power panel, and after cooking is finished, the motor of the exhaust fan still idles for a period of time, and the starting and the closing of the motor are controlled only by time, so that the cooking equipment is not accurate enough and has high power consumption.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a wind guiding structure that an exhaust fan can supply power autonomously.
The second technical problem to be solved by the present invention is to provide a wind guiding structure for an exhaust fan capable of self-adaptively starting and self-supplying power, aiming at the prior art.
The third technical problem to be solved by the present invention is to provide an air guiding structure with stable autonomous power supply state and high efficiency.
The fourth technical problem to be solved by the present invention is to provide a broiling cooking device having the above-mentioned air guide structure, in view of the prior art.
The technical scheme adopted by the invention for solving at least one technical problem is as follows: a wind guide structure comprises an exhaust passage with an exhaust fan, wherein the exhaust passage is provided with an air inlet which is in fluid communication with an air outlet of a liner, and the wind guide structure is characterized in that a heat preservation cover and a temperature difference power generation device which is electrically connected with the exhaust fan are arranged in the exhaust passage, the heat preservation cover is covered on the air inlet, an air outlet which is communicated with the air inlet is arranged on the wall of the heat preservation cover, the temperature difference power generation device is arranged on the heat preservation cover, the heat preservation cover is provided with a heat conduction surface, the cold end of the temperature difference power generation device is opposite to the air outlet of the exhaust fan, and the hot end of the temperature difference power generation device is contacted with the heat conduction surface.
The heat of the hot air entering the heat-insulating cover can be transferred to the hot end of the thermoelectric power generation device in various ways: the heat of the hot air is firstly transferred to the heat conducting surface of the heat insulation cover and then is conducted to the hot end of the temperature difference power generation device through the heat conducting surface; or the hot air is directly sprayed to the hot end of the temperature difference power generation device through the air outlet, and the heat is transferred to the hot end of the temperature difference power generation device in a direct contact mode. Preferably, the other side of the heat-insulating cover is an air outlet surface, and the air outlet surface is provided with the air outlet, namely the hot end of the thermoelectric power generation device and the air outlet are separately arranged, and the heat of the hot air entering the heat-insulating cover is transferred to the hot end of the thermoelectric power generation device through the heat-conducting surface, so that on the basis of ensuring that the hot end of the thermoelectric power generation device is effectively heated, the influence of the hot end of the thermoelectric power generation device on the air outlet of the air outlet can be effectively avoided, the air outlet efficiency of the air outlet is ensured, and the exhaust efficiency of the inner container is further ensured.
Furthermore, the air outlet surface and the heat conduction surface are arranged oppositely, so that the interference of the arrangement of the temperature difference power generation device on the air outlet of the air outlet can be further avoided, the retention time of hot air flowing to the heat preservation cover wall where the heat conduction surface is located can be prolonged, the hot air and the heat preservation cover wall where the heat conduction surface is located can be fully subjected to heat exchange, the temperature rise of the hot end of the temperature difference power generation device can be effectively guaranteed, and in addition, the air outlet of the air outlet can be better discharged along with the air outlet of the exhaust fan through the air outlet of the exhaust channel.
Furthermore, the other side surfaces of the heat-insulating cover except the heat-conducting surface are provided with heat-insulating layers. The hot air entering the heat preservation cover can transmit heat to the heat conducting surface in a centralized manner, and the heat conducting surface is guaranteed to obtain enough heat to guarantee the temperature rise of the temperature difference power generation device.
In order to ensure that the heat conducting surface can fully transmit heat to the hot end of the temperature difference power generation device, further, the hot end of the temperature difference power generation device is attached to the heat conducting surface of the heat insulation cover.
The cold end of the temperature difference power generation device can be fully cooled for the air outlet of the exhaust fan, and the cold end of the temperature difference power generation device is vertically arranged and is right opposite to the air outlet of the exhaust fan.
Further, still including the last mounting panel and the exhaust hood of level setting, this exhaust hood cover is established on the upper surface of last mounting panel and encloses into above-mentioned exhaust passage with this last mounting panel, and above-mentioned air inlet is seted up on last mounting panel, and above-mentioned heat preservation cover is established on the upper surface of the last mounting panel at air inlet place, and above-mentioned exhaust fan is installed on exhaust passage's air intake, and the both sides of the surface of giving vent to anger of above-mentioned heat preservation cover are vertical respectively to be provided with the guide plate that extends along exhaust passage air current direction. The air outlet of the exhaust fan can guide hot air entering the exhaust channel from the air outlet to the air outlet of the exhaust channel better by arranging the guide plate, so that the exhaust efficiency of the exhaust channel is improved.
Furthermore, the appearance of heat preservation cover is square, and each guide plate all includes first water conservancy diversion face and second water conservancy diversion face, and wherein, first water conservancy diversion face lies in the front side of second water conservancy diversion face along exhaust passage's air current direction, and the extending direction of first water conservancy diversion face and the extending direction mutually perpendicular of above-mentioned air outlet face, and second water conservancy diversion face is by outer inwards slope along exhaust passage's air current direction. Therefore, the second flow guide surfaces can guide the air outlet of the exhaust fan to the air outlet, so that the air flow at the air outlet is driven and guided to the air outlet of the exhaust channel under the matching of the first flow guide surfaces.
Furthermore, the first flow guide surface and the second flow guide surface of each flow guide plate are connected, and the junction of the first flow guide surface and the second flow guide surface is respectively opposite to the air outlet surface. Thereby can be better with the steam of gas outlet department along the air outlet of horizontal direction exhaust passage, furthest avoids steam to rise upwards.
Furthermore, the top surface of the exhaust hood is provided with a mounting position for mounting a power panel, and the mounting position is positioned on the front side of the air outlet surface of the heat-preservation hood along the airflow direction of the exhaust channel. Thereby can avoid rising upwards by the steam that the air inlet got into through setting up above-mentioned guide plate for the exhaust hood roof regional temperature of heat preservation cover top is lower relatively, installs the power strip here and can reduce the influence of the steam that the gas outlet got into to the thermal radiation of power strip to the at utmost, avoids the influence of high temperature to the performance of power strip, effectively prolongs the life of power strip.
Furthermore, the top wall of the exhaust hood inclines downwards along the airflow direction of the exhaust channel, and the top wall of the exhaust hood where the installation position is located is raised upwards. Therefore, cold air blown out by the exhaust fan can stay at the top wall of the exhaust hood where the installation position is located, so that the cold air can be fully subjected to heat exchange with the power panel, heat generated during working of the power panel is taken away, and the heat dissipation effect on the power panel is improved.
Furthermore, the top wall part of the exhaust hood where the installation position is located extends horizontally, the installation position inclines downwards along the top wall part of the exhaust hood on the front side in the airflow direction of the exhaust channel, the top edge of each guide plate extends horizontally, the first guide surface of each guide plate is located below the installation position, and the top edge of the guide plate part where each first guide surface is located is adjacent to the lower surface of the top wall of the exhaust hood where the installation position is located. Therefore, hot air at the air outlet can be further prevented from flowing to the top wall of the exhaust hood where the installation position is located, and meanwhile, the staying time of cold air blown out by the exhaust fan at the top wall of the exhaust hood where the installation position is located can be further prolonged, so that the heat dissipation effect on the power panel is further improved.
Furthermore, the air inlet is arranged at the center of the upper mounting plate at the surrounding position of the heat-insulating cover, the upper surface part of the upper mounting plate where the air inlet is arranged is downwards sunken along the circumferential direction by taking the air inlet as the center to form an air inlet groove, and the air inlet is communicated with the air outlet of the inner container through an air permeable pipe. Therefore, hot air entering the heat-insulating cover can stably flow in the heat-insulating cover and further fully contact with the heat-conducting surface of the heat-insulating cover.
The technical scheme adopted for further solving the fourth technical problem is as follows: a baking cooking device with the air guide structure.
Compared with the prior art, the invention has the advantages that: the air guide structure of the invention comprises a heat preservation cover and a temperature difference power generation device, the temperature of the hot end and the cold end of the temperature difference power generation device is ambient temperature in the initial stage of baking, high-temperature gas is generated in an inner container and is discharged out through an exhaust port, so that the high-temperature discharged gas in the inner container enters the heat preservation cover through an air inlet, as the hot end of the temperature difference power generation device is contacted with the heat conduction surface of the heat preservation cover, the heat transferred to the heat conduction surface by the high-temperature gas entering the heat preservation cover can be transferred to the hot end of the temperature difference power generation device, so that the temperature of the hot end of the temperature difference power generation device is increased, meanwhile, the cold end of the temperature difference power generation device is opposite to the air outlet of an exhaust fan, so that the cold air blown out by the exhaust fan can reduce the temperature of the cold end, the temperature difference is generated between the hot end and the cold end of the temperature difference power generation device, when the temperature difference power generation device reaches a certain value, the temperature difference power generation device starts to work to generate electric quantity and supply to the exhaust fan, the exhaust fan obtains the electric quantity and rotates, and the cold wind that the exhaust fan rotation and produced flows along exhaust passage and cools off temperature difference power generation facility's cold junction for temperature difference power generation facility's cold junction remains the lower temperature throughout, and then makes temperature difference power generation facility's hot junction and cold junction remain certain difference in temperature throughout, guarantees that temperature difference power generation facility continuously produces the electric quantity of supplying with the exhaust fan, realizes the autonomic power supply of the exhaust fan among the wind-guiding structure. In addition, when baking cooking equipment stop work, steam stops getting into in the heat preservation cover, when the difference in temperature of thermoelectric generation device's cold junction and hot junction slowly dwindled and is less than certain numerical value, thermoelectric generation device can the automatic stop electricity generation, exhaust fan stop work, thereby can realize that thermoelectric generation device opens and close the self-adaptation regulation of generating function according to the size of the outer exhaust gas volume of inner bag, and, after thermoelectric generation device started the electricity generation, along with exhaust fan's work, thermoelectric generation device's cold junction and hot junction can keep certain difference in temperature all the time, thereby can realize thermoelectric generation device's stable electricity generation, improve the efficiency of electricity generation.
Drawings
FIG. 1 is a schematic diagram of a grilling cooking apparatus according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of the structure of FIG. 1;
FIG. 3 is a schematic view of a portion of an embodiment of an grilling cooking apparatus according to the present invention;
FIG. 4 is a schematic view of another embodiment of the grilling cooking apparatus of the present invention;
fig. 5 is a schematic view of still another partial structure of the grilling cooking apparatus according to the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to 5, in this embodiment, the grilling cooking apparatus is an electric oven, and includes an inner container 1 and an air guiding structure, where the air guiding structure includes an upper mounting plate 11 and an exhaust hood 3, the upper mounting plate 11 is disposed above the inner container 1, the exhaust hood 3 covers the upper surface of the upper mounting plate 11 and forms an exhaust channel 30 with the upper mounting plate 11, and an air inlet of the exhaust channel 30 is provided with an exhaust fan 31. The top wall of the inner container 1 is provided with an exhaust port 10, the upper mounting plate 11 is provided with an air inlet 111 positioned in the exhaust passage 30, and the upper mounting plate and the lower mounting plate are communicated through a vertically arranged ventilation pipe 2.
The exhaust passage 30 is provided with a heat preservation cover 4 and a thermoelectric generation device 5 electrically connected with the exhaust fan 31, the heat preservation cover 4 is covered on the air inlet 111, the wall of the cover is provided with an air outlet 421 communicated with the air inlet 111, the thermoelectric generation device 5 is arranged on the heat preservation cover 4, the heat preservation cover 4 is provided with a heat conduction surface 41, the cold end 51 of the thermoelectric generation device 5 is opposite to the air outlet 311 of the exhaust fan 31, and the hot end 52 of the thermoelectric generation device 5 is contacted with the heat conduction surface 41. In the initial stage of baking, the temperatures of the hot end 52 and the cold end 51 of the thermoelectric generation device 5 are both ambient temperatures, and along with the baking, high-temperature gas generated in the liner 1 is discharged through the exhaust port 10, so that the high-temperature discharged gas in the liner 1 enters the heat-insulating cover 4 through the air inlet 111, because the hot end 52 of the thermoelectric generation device 5 is in contact with the heat-conducting surface 41 of the heat-insulating cover 4, the heat of the high-temperature gas entering the heat-insulating cover 4 transferred to the heat-conducting surface 41 can be transferred to the hot end 52 of the thermoelectric generation device 5, so that the temperature of the hot end 52 of the thermoelectric generation device 5 is increased, meanwhile, the cold end 51 of the thermoelectric generation device 5 is opposite to the air outlet 311 of the exhaust fan 31, so that the cold air blown by the exhaust fan 31 can reduce the temperature of the cold end 51, and the hot end 52 and the cold end 51 of the thermoelectric generation device 5 generate a temperature difference, when the temperature difference between the two reaches a certain value, the thermoelectric generation device 5 starts to work to generate electric quantity to supply the exhaust fan 31, the exhaust fan 31 obtains the electric quantity to rotate, cold air generated by rotation of the exhaust fan 31 flows along the exhaust passage 30 to cool the cold end 51 of the thermoelectric generation device 5, so that the cold end 51 of the thermoelectric generation device 5 is always kept at a lower temperature, a certain temperature difference is kept between the hot end 52 and the cold end 51 of the thermoelectric generation device 5, the thermoelectric generation device 5 is guaranteed to continuously generate the electric quantity to be supplied to the exhaust fan 31, and independent power supply of the exhaust fan 31 in the air guide structure is achieved. In addition, when the baking cooking equipment stops working, hot air stops entering the heat preservation cover 4, when the temperature difference between the cold end 51 and the hot end 52 of the temperature difference power generation device 5 is slowly reduced and is lower than a certain numerical value, the temperature difference power generation device 5 can automatically stop power generation, and the exhaust fan 31 stops working, so that the self-adaptive adjustment of the temperature difference power generation device 5 on and off the power generation function according to the amount of the gas discharged from the inner container 1 can be realized, and after the temperature difference power generation device 5 starts power generation, along with the work of the exhaust fan 31, the cold end 51 and the hot end 52 of the temperature difference power generation device 5 can always keep a certain temperature difference, so that the stable power generation of the temperature difference power generation device 5 can be realized, and the power generation efficiency is improved.
The heat of the hot air entering the heat-retaining cover 4 can be transferred to the hot end 52 of the thermoelectric generation device 5 in various ways: the heat of the hot air is firstly transferred to the heat conducting surface 41 of the heat insulating cover 4, and then is conducted to the hot end 52 of the thermoelectric power generation device 5 through the heat conducting surface 41 (under the condition that the air outlet 421 is not arranged on the heat conducting surface 41); the hot air is directly sprayed to the hot end 52 of the thermoelectric generation device 5 through the air outlet 421, and the heat is transferred to the hot end 52 of the thermoelectric generation device 5 by direct contact (in the case where the air outlet 421 is provided on the heat conduction surface 41). In this embodiment, preferably, the other side surface of the heat-insulating cover 4 is an air outlet surface 42, and the air outlet surface 42 is provided with the air outlet 421, that is, the hot end 52 of the thermoelectric generation device 5 and the air outlet 421 are separately disposed, and heat of hot air entering the heat-insulating cover 4 is transferred to the hot end 52 of the thermoelectric generation device 5 through the heat conducting surface 41, so that on the basis of ensuring effective temperature rise of the hot end 52 of the thermoelectric generation device 5, the influence of the hot end 52 of the thermoelectric generation device 5 on the air outlet of the air outlet 421 can be effectively avoided, the air outlet efficiency of the air outlet 421 is ensured, and further, the exhaust efficiency of the liner 1 is ensured.
Specifically, the heat-insulating cover 4 is square, the heat-conducting surface 41 is the rear side surface of the heat-insulating cover 4, and the air-outlet surface 42 is the front side surface of the heat-insulating cover 4, that is, the air-outlet surface 42 is arranged opposite to the heat-conducting surface 41, so that the interference of the arrangement of the thermoelectric generation device 5 on the outlet of the air outlet 421 can be further avoided, the retention time of the hot air flowing to the cover wall of the heat-insulating cover 4 where the heat-conducting surface 41 is located can be prolonged, the hot air can fully exchange heat with the cover wall of the heat-insulating cover 4 where the heat-conducting surface 41 is located, the temperature rise of the hot end 52 of the thermoelectric generation device 5 can be effectively ensured, and in addition, the outlet of the air outlet 421 can be better discharged through the air outlet 302 of the exhaust passage 30 along with the outlet of the exhaust fan 31. In addition, in order to make the hot air entering the heat-insulating cover 4 transmit heat to the heat-conducting surface 41 in a concentrated manner, and ensure that the heat-conducting surface 41 obtains enough heat to ensure the temperature rise of the thermoelectric generation device 5, heat-insulating layers (not shown) are disposed on the other side surfaces of the heat-insulating cover 4 except the heat-conducting surface 41, that is, in this embodiment, heat-insulating layers are disposed on the left and right side surfaces, the top surface, and the rear side surface of the heat-insulating cover 4. In order to make the heat conduction surface 41 fully transmit heat to the hot end 52 of the thermoelectric generation device 5, further, the hot end 52 of the thermoelectric generation device 5 is attached to the heat conduction surface 41 of the heat insulation cover 4, and meanwhile, the cold end 51 of the thermoelectric generation device 5 is vertically arranged and is right opposite to the air outlet 311 of the exhaust fan 31, so that the cold end 51 of the thermoelectric generation device 5 can be fully cooled by the outlet air of the exhaust fan 31.
Further, the left and right sides of the air outlet surface 42 of the heat-insulating cover 4 are respectively vertically provided with the guide plates 6 extending in the front-rear direction, so that the hot air entering the exhaust passage 30 from the air outlet 421 can be better guided to the air outlet 302 of the exhaust passage 30 by the air outlet of the exhaust fan 31 due to the arrangement of the guide plates 6, and the exhaust efficiency of the exhaust passage 30 is improved. In this embodiment, each of the deflectors 6 includes a first deflector surface 61 and a second deflector surface 62, wherein the first deflector surface 61 is located at the front side of the second deflector surface 62, the extending direction of the first deflector surface 61 is perpendicular to the extending direction of the air outlet surface 42, and the second deflector surface 62 is inclined from back to front toward the inside, so that each of the second deflector surfaces 62 can guide the outlet air of the exhaust fan 31 to the air outlet 421, thereby driving the air flow at the air outlet 421 and guiding the air flow at the air outlet 421 to the air outlet 302 of the exhaust passage 30 under the matching guide of each of the first deflector surfaces 61. Preferably, the first and second flow guiding surfaces 61 and 62 of each flow guiding plate 6 are connected, and the boundary of the first and second flow guiding surfaces is right opposite to the air outlet surface 42, so that the hot air at the air outlet 421 can be better guided to the air outlet 302 of the exhaust passage 30 along the horizontal direction, and the hot air is prevented from rising upwards to the greatest extent.
Since the flow guide plate 6 is provided to prevent the hot air entering from the air inlet 111 from rising upward, the top surface of the exhaust hood 3 is provided with a mounting position 32 for mounting a power supply board (not shown), and the mounting position 32 is located on the front side of the air outlet surface 42 of the heat insulating hood 4. Specifically, in this embodiment, the mounting rack 7 is disposed on the mounting position 32, and the power board is mounted on the mounting rack 7. Therefore, the temperature of the top wall area of the exhaust hood 3 above the heat-preservation hood 4 is relatively low, the power panel is arranged at the position, the influence of hot air entering the air outlet 421 on the heat radiation of the power panel can be reduced to the greatest extent, the influence of high temperature on the performance of the power panel is avoided, and the service life of the power panel is effectively prolonged.
Further, the ceiling wall of the exhaust hood 3 is inclined downward from the rear to the front, and the portion of the ceiling wall of the exhaust hood 3 where the mounting location 32 is located is raised upward. Therefore, cold air blown out by the exhaust fan 31 can stay on the top wall of the exhaust hood 3 where the installation position 32 is located, so that the cold air can be fully subjected to heat exchange with the power panel, heat generated during the work of the power panel is taken away, and the heat dissipation effect on the power panel is improved. Still further, the top wall portion of the exhaust hood 3 where the mounting location 32 is located extends horizontally, the top wall portion of the exhaust hood 3 located on the front side of the mounting location 32 is inclined downward, the top edge of each baffle 6 extends horizontally, the first baffle surface 61 of each baffle 6 is located below the mounting location 32, and the top edge of the baffle 6 portion where each first baffle surface 61 is located is adjacent to the lower surface of the top wall of the exhaust hood 3 where the mounting location 32 is located. Therefore, hot air at the air outlet 421 can be further prevented from flowing to the top wall of the exhaust hood 3 where the mounting position 32 is located, and meanwhile, the staying time of cold air blown out by the exhaust fan 31 on the top wall of the exhaust hood 3 where the mounting position 32 is located can be further prolonged, so that the heat dissipation effect on the power panel is further improved.
In addition, in this embodiment, the air inlet 111 is formed in the center of the upper mounting plate 11 surrounding the heat-insulating cover 4, and the upper surface portion of the upper mounting plate 11 where the air inlet 111 is located is recessed downward in the circumferential direction with the air inlet 111 as the center to form an air inlet groove 1111, and the air inlet 111 is communicated with the air outlet 10 of the liner 1 through the ventilation pipe 2. Therefore, the hot air entering the heat-insulating cover 4 can flow stably in the heat-insulating cover 4 and further contact with the heat-conducting surface 41 of the heat-insulating cover 4 fully.
The working process of the invention is as follows:
the initial stage of toasting, cold junction 51 and hot junction 52 of thermoelectric generation device 5 are ambient temperature, toast and carry out a period of back, the hot-air in inner bag 1 is slowly arranged outward through gas vent 10, the exhaust hot-air passes through ventilative pipe 2 and gets into in the heat preservation cover 4, the hot-air is full of heat preservation cover 4 and fully transmits the heat to the heat conduction face 41 of heat preservation cover 4, the temperature of hot junction 52 of thermoelectric generation device 5 slowly rises and forms the difference in temperature with cold junction 51, when the difference in temperature between them reaches certain numerical value, thermoelectric generation device 5 begins to work and produces the electric quantity, thereby provide the power for exhaust fan 31's motor, exhaust fan 31 begins to work.
The air-out of exhaust fan 31 blows to cold junction 51 of thermoelectric generation device 5 to can effectively cool off the cold junction 51 of thermoelectric generation device 5, make the cold junction 51 and the hot junction 52 of thermoelectric generation device 5 can continuously keep certain difference in temperature, make thermoelectric generation device 5 can continuously work and provide stable power for exhaust fan 31's motor.
When the baking is finished, the inner container 1 does not discharge hot air outwards, the air temperature in the heat-insulating cover 4 slowly drops, so that the temperature of the heat-conducting surface 41 of the heat-insulating cover 4 also drops synchronously, the temperature of the hot end 52 of the temperature difference power generation device 5 drops, when the temperature drops to a certain value, the temperature difference between the hot end 52 of the temperature difference power generation device 5 and the cold end 51 is not enough to enable the temperature difference power generation device 5 to generate electricity, the power required by the work of the motor of the exhaust fan 31 cannot be supplied, and the exhaust fan 31 stops working.
Claims (12)
1. An air guide structure comprises an exhaust passage (30) with an exhaust fan (31), the exhaust passage (30) is provided with an air inlet (111) which is in fluid communication with an exhaust port (10) of an inner container (1), the air guide structure is characterized in that a heat preservation cover (4) and a temperature difference power generation device (5) which is electrically connected with the exhaust fan (31) are arranged in the exhaust passage (30), the heat preservation cover (4) is covered on the air inlet (111), an air outlet (421) which is communicated with the air inlet (111) is arranged on the cover wall of the heat preservation cover, the temperature difference power generation device (5) is arranged on the heat preservation cover (4), the heat preservation cover (4) is provided with a heat conduction surface (41), a cold end (51) of the temperature difference power generation device (5) is opposite to an air outlet (311) of the exhaust fan (31), and a hot end (52) of the temperature difference power generation device (5) is in contact with the heat conduction surface (41), the air inlet (111) is arranged at the center of the upper mounting plate (11) surrounded by the heat-insulating cover (4), the upper surface part of the upper mounting plate (11) where the air inlet (111) is arranged is recessed downwards along the circumferential direction by taking the air inlet (111) as the center to form an air inlet groove (1111), the air inlet (111) is communicated with the air outlet (10) of the inner container (1) through the ventilation pipe (2),
the air exhaust hood is characterized by further comprising an upper mounting plate (11) and an air exhaust hood (3) which are horizontally arranged, the air exhaust hood (3) is covered on the upper surface of the upper mounting plate (11) and surrounds the upper surface of the upper mounting plate (11) to form the air exhaust channel (30), the air inlet (111) is formed in the upper mounting plate (11), the heat preservation hood (4) is covered on the upper surface of the upper mounting plate (11) where the air inlet (111) is located, the air exhaust fan (31) is installed on an air inlet (301) of the air exhaust channel (30), and guide plates (6) extending along the air flow direction of the air exhaust channel (30) are vertically arranged on two sides of an air outlet surface (42) of the heat preservation hood (4) respectively.
2. The air guide structure according to claim 1, wherein the other side surface of the heat insulating cover (4) is an air outlet surface (42), and the air outlet surface (42) is provided with the air outlet (421).
3. The air guide structure according to claim 2, wherein the air outlet surface (42) is disposed opposite to the heat conduction surface (41).
4. The air guide structure as claimed in claim 2, wherein the heat insulating cover (4) is provided with heat insulating layers on the other sides except the heat conducting surface (41).
5. The air guide structure according to claim 1, wherein the hot end (52) of the thermoelectric generation device (5) is attached to the heat conducting surface (41) of the heat insulating cover (4).
6. The air guiding structure as recited in claim 2, characterized in that the cold end (51) of the thermoelectric generation device (5) is vertically arranged and is opposite to the air outlet (311) of the exhaust fan (31).
7. The air guide structure according to claim 1, wherein the heat retaining cover (4) has a square shape, each of the air guide plates (6) includes a first air guide surface (61) and a second air guide surface (62), wherein the first air guide surface (61) is located on a front side of the second air guide surface (62) in an air flow direction of the exhaust passage (30), an extending direction of the first air guide surface (61) is perpendicular to an extending direction of the air outlet surface (42), and the second air guide surface (62) is inclined from outside to inside in the air flow direction of the exhaust passage (30).
8. The air guide structure according to claim 1, wherein the first and second guide surfaces (61, 62) of each guide plate (6) are connected, and the junction of the first and second guide surfaces is respectively opposite to the air outlet surface (42).
9. The air guide structure according to claim 7, wherein a mounting position (32) for mounting a power supply board is provided on the top surface of the exhaust hood (3), and the mounting position (32) is located on the front side of the air outlet surface (42) of the heat insulating hood (4) in the airflow direction of the exhaust passage (30).
10. The air guide structure according to claim 9, wherein a ceiling wall of the exhaust hood (3) is inclined downward in an air flow direction of the exhaust duct (30), and a ceiling wall portion of the exhaust hood (3) where the mounting position (32) is located is raised upward.
11. The air guide structure according to claim 9, wherein the top wall portion of the exhaust hood (3) where the mounting locations (32) are located extends horizontally, the mounting locations (32) are inclined downward along the top wall portion of the exhaust hood (3) on the front side in the airflow direction of the exhaust passage (30), the top edge of each air deflector (6) extends horizontally, the first air deflector surface (61) of each air deflector (6) is located below the mounting locations (32), and the top edge of the portion of the air deflector (6) where each first air deflector surface (61) is located is adjacent to the lower surface of the top wall of the exhaust hood (3) where the mounting locations (32) are located.
12. A grilling cooking apparatus having the air guide structure according to any one of claims 1 to 11.
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| CN111839255A (en) | 2020-10-30 |
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