CN112901531A - Baking heating structure and electric oven with same - Google Patents
Baking heating structure and electric oven with same Download PDFInfo
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- CN112901531A CN112901531A CN202110119191.3A CN202110119191A CN112901531A CN 112901531 A CN112901531 A CN 112901531A CN 202110119191 A CN202110119191 A CN 202110119191A CN 112901531 A CN112901531 A CN 112901531A
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- air inlet
- plate
- air
- sliding plate
- fan blade
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/002—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying geometry within the pumps, e.g. by adjusting vanes
Abstract
The invention relates to a baking heating structure and an electric oven. In the initial state, the first shielding plate and the second shielding plate are located at the initial positions, the air inlet area of the air inlet is the minimum, when the air heater rotates at a low speed, the axial flow fan blades rotate synchronously, the air outlet flow of the axial flow fan blades is blown to the sliding plate from front to back to push the sliding plate backwards, the sliding plate moves backwards, the first shielding plate and the second shielding plate move outwards synchronously relative to the center of the air inlet respectively, and the air inlet area of the air inlet is increased. When the hot air blower rotates at a high speed, the rotating speed of the axial flow fan blades is synchronously increased, so that the sliding plate is pushed to move to the innermost end of the stroke, the first shielding plate and the second shielding plate respectively move to the outermost end of the stroke, and the air inlet area of the air inlet is the largest. Compared with the prior art, the air inlet area of the air inlet can be adjusted according to the difference of the rotating speed of the air heater, and the cooking effect is further improved.
Description
Technical Field
The invention relates to the field of cooking devices, in particular to a baking heating structure and an electric oven with the same.
Background
The back side of the inner container of baking cooking devices such as electric ovens is generally provided with a hot air baffle with an air inlet and an air outlet, the hot air baffle and the back plate of the inner container enclose a hot air chamber, an air heater is installed in the hot air chamber, and the outer periphery of the fan blade of the air heater is provided with a heating pipe. When the hot air blower rotates, air in the inner container is sucked into the hot air chamber through the air inlet of the hot air baffle, and the hot air heated by the heating pipe flows back to the inner container through the air outlet of the hot air baffle under the action of centrifugal force of the hot air blower, so that a user can heat food.
The area of an air inlet of an existing hot air baffle is generally fixed, and for an oven applying a double-rotating-speed or stepless-rotating-speed air heater, in order to obtain a better cooking effect, large air quantity is needed at a high rotating speed, the area of the air inlet of the air heater baffle needs to be larger, small air quantity is needed at a low rotating speed, and the area of the air inlet of the air heater baffle is smaller. It can be seen that the traditional hot air baffle structure with fixed air inlet area causes limitation to the further improvement of the cooking effect of the roasting cooking device. In addition, among the current air heater that is used for baking cooking device, centrifugal fan blade is often direct mount on the hot-air blower is epaxial, and the air heater is when high rotational speed, and the noise is great, and then makes whole baking cooking device's noise at work great, influences user's use and experiences.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a baking heating structure capable of adaptively adjusting the area of the air inlet of the hot air baffle according to the different rotation speeds of the air heater in the prior art.
The second technical problem to be solved by the present invention is to provide a roasting heating structure with low working noise.
The third technical problem to be solved by the present invention is to provide an electric oven with the above-mentioned broiling heating structure.
The technical scheme adopted by the invention for solving at least one technical problem is as follows: a baking heating structure comprises an inner container and an air heater, wherein a hot air baffle with an air inlet and an air outlet is arranged at the rear side of the inner container, a hot air chamber is formed by the hot air baffle and a back plate of the inner container, the air heater is arranged on the back plate of the inner container, a centrifugal fan blade of the air heater is positioned in the hot air chamber, a back heating pipe is arranged at the outer periphery of the centrifugal fan blade, the air inlet is arranged at the center of the hot air baffle, the air inlet is a circular array formed by arranging air inlet holes and is arranged opposite to the front and the back of the centrifugal fan blade,
the two sides of the air inlet of the hot air baffle are respectively symmetrically provided with a first shielding plate and a second shielding plate which can respectively shield part of air inlet holes of the air inlet by taking the central line as the center, the front end of the fan blade shaft of the air heater is respectively provided with an axial flow fan blade and a sliding plate positioned behind the axial flow fan blade, the sliding plate is sleeved on the fan blade shaft and can move along the fan blade shaft under the air outlet pressure of the axial flow fan blade,
the sliding plate is linked with the shielding plates through the linkage mechanism, when the sliding plate moves towards the direction of the hot air baffle, the first shielding plate and the second shielding plate respectively move outwards synchronously along the front surface of the hot air baffle relative to the center of the air inlet, the air inlet area of the air inlet is increased, when the sliding plate moves towards the direction far away from the hot air baffle, the first shielding plate and the second shielding plate respectively move inwards synchronously along the front surface of the hot air baffle relative to the center of the air inlet, the air inlet area of the air inlet is reduced, in addition, the first shielding plate and the second shielding plate are respectively positioned at the innermost ends of the strokes of the first shielding plate and the second shielding plate in an initial state, the air inlet area of the air inlet is minimum, and the sliding plate is positioned.
Furthermore, a wind scooper extending in the front-back direction is covered on the front surface of the hot wind baffle at the air inlet, the wind scooper is cylindrical and is arranged by taking the fan blade shaft as the center, the sliding plate and the pressure spring are both positioned in the wind scooper, the side walls of the wind scooper are provided with flow guide openings at intervals along the circumferential direction, and the front surface of the sliding plate is provided with a flow guide surface capable of guiding airflow to the flow guide openings. The air outlet flow of the axial flow fan blade blows to the sliding plate, the air outlet of the axial flow fan blade deviates from the direction (flows along the direction parallel to the plane where the air inlet is located) when the sliding plate is pushed to move backwards along the fan blade shaft, therefore, through the arrangement of the air guide cover, the air guide opening is formed in the air guide cover, the air outlet of the axial flow fan blade is guided to the air inlet of the hot air baffle again through the matching action of the air guide surface on the sliding plate and the air guide opening on the air guide cover, the air quantity loss is avoided, and the air quantity of the baking heating structure is further improved.
Furthermore, the flow guide opening is arranged along the axial direction of the air guide cover, the sliding plate is arranged along the direction vertical to the fan blade shaft, the cross section of the sliding plate is circular and protrudes forwards, the flow guide surface comprises a circular first flow guide surface positioned at the center of the front surface of the sliding plate, and the flow guide surface also comprises a second flow guide surface which extends from the periphery of the first flow guide surface towards the back and the outside along the circumferential direction to form a circular truncated cone shape. The air outlet of the axial flow fan blade is firstly blown to the first flow guide surface horizontally from front to back, then smoothly blown to each flow guide opening along the second flow guide surface, and finally smoothly enters the hot air chamber through the air inlet of the hot air baffle.
Further, the ratio of the area of the cross section of the air guide cover, the area of the air inlet of the hot air baffle and the area of the first flow guide surface of the sliding plate is as follows: 1: 1.8-2.2: 12-15. Therefore, the air outlet of the axial flow fan blade can be better guided to the air inlet through the matching action of the flow guide surface and the flow guide opening.
Further, the linkage mechanism comprises a first connecting rod and a second connecting rod, a first avoidance port and a second avoidance port are formed in the side wall of the air guide cover respectively and oppositely along the circumferential direction, the first connecting rod and the second connecting rod penetrate through the first avoidance port and the second avoidance port respectively and can slide back and forth along the length direction of the corresponding avoidance ports respectively, one end of the first connecting rod is rotatably connected with one end of the sliding plate, the other end of the first connecting rod is rotatably connected with the first shielding plate, one end of the second connecting rod is rotatably connected with the other end of the sliding plate, and the other end of the second connecting rod is rotatably connected with the second shielding plate. Therefore, when the sliding plate moves along the fan blade shaft, the connecting rods are respectively driven to move, and the first shielding plate and the second shielding plate move along the front surface of the hot air baffle relative to the center of the air inlet.
Furthermore, a sliding structure is arranged between the rear surface of each curtain plate and the front surface of the hot air baffle plate respectively along the sliding direction of each curtain plate, each sliding structure comprises a sliding block arranged at one of the rear surface of the corresponding baffle plate and the front surface of the hot air baffle plate, and a guide rail arranged at the other position for the sliding block to be embedded and to slide back and forth. Therefore, each shielding plate can move more stably, and the air inlet area of the air inlet can be adjusted in a self-adaptive mode better through the movement of each shielding plate.
Furthermore, the two ends of the sliding plate are respectively fixed with a first hinging seat, each first hinging seat is respectively fixed with a first rotating shaft, the inner side end of each connecting rod is respectively provided with a connecting sliding groove along the length direction thereof, each first rotating shaft is respectively inserted into the corresponding connecting sliding groove and can slide back and forth along the connecting sliding groove,
when the shielding plates slide to the outmost ends of the strokes respectively, the air inlet area of the air inlet is the largest, the first rotating shafts are located at the inner side ends of the corresponding connecting sliding grooves respectively, and when the shielding plates slide to the outmost ends of the strokes respectively, the air inlet area of the air inlet is the smallest, and the first rotating shafts are located at the outer side ends of the corresponding connecting sliding grooves respectively. Therefore, the connecting sliding grooves are arranged on the connecting rods to limit and guide the movement of the sliding plate along the fan blade shaft, and the movement of each shielding plate is guided and limited in a reverse regulation mode, so that when the sliding plate is positioned at the foremost end of the stroke of the sliding plate, each shielding plate is positioned at the innermost end of the stroke of the sliding plate, and when the sliding plate is positioned at the rearmost end of the stroke of the sliding plate, each shielding plate is positioned at the outermost end of the stroke of the sliding plate.
Furthermore, the front end of the fan blade shaft is also sleeved with a pressure spring, the pressure spring is limited between the sliding plate and the hot air baffle, in an initial state, the pressure spring is in an unstressed state, and in a stressed state, the sliding plate can have a tendency of moving forwards along the fan blade shaft. Through setting up the pressure spring, on the one hand can make the sliding plate more steadily remove along the fan blade axle under the mating action of the thrust of the air-out air current of axial fan blade and the elastic force of pressure spring, on the other hand when air heater and axial fan blade stall, the sliding plate resumes to initial condition under the elastic force effect of pressure spring.
Furthermore, each sunshade all is half-circular ring shape, and the radius of each sunshade all is greater than the radius of air intake to, under the minimum state of the air inlet area of air intake, the centre of a circle of the horizontal projection place circle of each sunshade on hot-blast baffle all coincides with the centre of a circle of air intake. Therefore, the size of the air inlet area of the air inlet can be better adjusted through the movement of each shielding plate.
Furthermore, the air heater also comprises a motor arranged on the rear surface of the inner container back plate, a motor shaft of the motor penetrates through the back plate of the inner container along the front-back direction, a driving gear is arranged on the motor shaft, a driven gear meshed with the driving gear is arranged at the rear end of the fan blade shaft, and the transmission ratio of the driving gear to the driven gear is larger than 1.2. Therefore, the rotating speed of the centrifugal fan blades can be increased, namely, the high-speed rotation of the centrifugal fan blades can be obtained when the rotating speed of the motor of the air heater is low, so that the noise of the air heater can be reduced, and the integral working noise of the baking heating structure can be reduced.
The technical solution adopted to further solve the third technical problem is as follows: an electric oven is characterized in that the electric oven is provided with the baking heating structure.
Compared with the prior art, the invention has the advantages that: the baking heating structure comprises a first shielding plate, a second shielding plate, axial flow fan blades and a sliding plate. Under the initial state, first sunshade and second sunshade are in initial position, and the air inlet area of air intake is minimum, and when the air heater rotated with low-speed, axial fan flabellum synchronous revolution, axial fan flabellum air-out air current blown to the sliding plate and promoted the sliding plate backward by preceding to back, and the sliding plate moved backward (moved towards hot-blast baffle direction promptly), and above-mentioned first sunshade and second sunshade move outwards in step for the center of air intake respectively, and the air inlet area of air intake increases, satisfies the demand of the relative low amount of wind. When the air heater rotates at a high speed, the rotating speed of the axial flow fan blades is synchronously increased, the thrust applied to the sliding plate by the air outlet airflow of the axial flow fan blades is obviously increased, the sliding plate is further pushed to move to the innermost end of the stroke of the sliding plate, meanwhile, the first shielding plate and the second shielding plate move to the outermost end of the stroke of the sliding plate respectively, the air inlet area of the air inlet is largest, the requirement for high air volume is met, therefore, the air inlet area of the air inlet can be adjusted according to the difference of the rotating speed of the air heater, and the cooking effect is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a grilling heating structure according to an embodiment of the present invention (in a state where an air inlet area of an air inlet is minimum);
fig. 2 is a cross-sectional view of a grill heating structure according to an embodiment of the present invention (in a state where an air inlet area of an air inlet is minimized);
fig. 3 is another cross-sectional view of the grill heating structure according to the embodiment of the present invention (with the minimum air intake area of the air intake);
fig. 4 is still another cross-sectional view of the grill heating structure according to the embodiment of the present invention (in a state where the air inlet area of the air inlet is minimized);
FIG. 5 is a partial exploded view of the grill heating structure according to an embodiment of the present invention (with the minimum air intake area of the air intake);
FIG. 6 is a schematic view of the structure of FIG. 5 in another direction;
FIG. 7 is a schematic view of the structure of the sliding plate according to the embodiment of the present invention;
fig. 8 is a schematic structural view of another state of the grill heating structure according to the embodiment of the present invention (in a state where the air intake area of the air intake opening is the largest);
fig. 9 is a cross-sectional view of another state of the grill heating structure according to the embodiment of the present invention (the state of the maximum air intake area of the air intake opening);
fig. 10 is another cross-sectional view of another state of the grill heating structure according to the embodiment of the present invention (the maximum air intake area of the air intake opening);
fig. 11 is still another cross-sectional view of the grilling heating structure in another state of the present invention (with the maximum air intake area of the air intake);
FIG. 12 is an enlarged view of portion A of FIG. 3;
FIG. 13 is an enlarged view of portion B of FIG. 4;
FIG. 14 is an enlarged view of portion C of FIG. 10;
fig. 15 is an enlarged view of portion D in fig. 11.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to 15, an electric oven includes a baking heating structure, the baking heating structure includes an inner container 1 and an air heater 2, a hot air baffle 3 having an air inlet 31 and an air outlet 32 is disposed at a rear side of the inner container 1, the hot air baffle 3 and a back plate of the inner container 1 enclose a hot air chamber 30, the air heater 2 is mounted on the back plate of the inner container 1, a centrifugal fan 21 of the air heater 2 is located in the hot air chamber 30, a back heating pipe 4 is disposed around an outer periphery of the centrifugal fan 21, the air inlet 31 is disposed at a center of the hot air baffle 3, and the air inlet 31 is a circular array formed by arranging air inlet holes 311 and is disposed opposite to the centrifugal fan 21 in front and rear directions.
Further, the hot air blower 2 further comprises a motor 22 mounted on the rear surface of the back plate of the inner container 1, a motor shaft 221 of the motor 22 is inserted through the back plate of the inner container 1 in the front-rear direction, a driving gear 2211 is arranged on the motor shaft 221, a driven gear 2111 engaged with the driving gear 2211 is mounted at the rear end of the fan blade shaft 211, and the transmission ratio of the driving gear 2211 to the driven gear 2111 is greater than 1.2. Therefore, the rotating speed of the centrifugal fan blade 21 can be increased, that is, the high-speed rotation of the centrifugal fan blade 21 can be obtained when the rotating speed of the motor 22 of the air heater 2 is low, so that the noise of the air heater 2 can be reduced, and the overall working noise of the baking heating structure can be reduced.
Furthermore, the left and right sides of the air inlet 31 of the hot air baffle 3 are respectively symmetrically provided with a first shielding plate 51 and a second shielding plate 52 which are centered on the vertical center line thereof and can respectively shield part of the air inlet holes 311 of the air inlet 31, the fan blade shaft 211 of the air heater 2 protrudes forward from the hot air baffle 3, the front end of the fan blade shaft 211 is respectively provided with an axial flow fan blade 6 and a sliding plate 7 positioned behind the axial flow fan blade 6, and the sliding plate 7 is sleeved on the fan blade shaft 211 and can move along the fan blade shaft 211 under the air outlet pressure of the axial flow fan blade 6. The slide plate 7 is interlocked with each shield plate by an interlocking mechanism 9, and when the slide plate 7 moves toward the hot air baffle plate 3, the first louver 51 and the second louver 52 are moved outward along the front surface of the hot wind blocking plate 3 in synchronization with the center of the air inlet 31 (the first louver 51 is directed to the left and the second louver 52 is directed to the right), respectively, the air inlet area of the air inlet 31 is increased, when the sliding plate 7 moves away from the hot air blocking plate 3, the first louver 51 and the second louver 52 move inward along the front surface of the hot air blocking plate 3 synchronously with respect to the center of the air inlet 31 (the first louver 51 is directed to the right and the second louver 52 is directed to the left), respectively, the air inlet area of the air inlet 31 decreases, in the initial state, the first shutter 51 and the second shutter 52 are located at the innermost ends of their strokes, respectively, the air intake area of the air intake port 31 is the smallest, and the slide plate 7 is located at the foremost end of its stroke. When the air heater 2 rotates at a low speed, the axial flow fan 6 rotates synchronously, the air flow discharged from the axial flow fan 6 blows to the sliding plate 7 from front to back to push the sliding plate 7 backwards, the sliding plate 7 moves backwards (i.e. moves towards the hot air baffle 3), the first shielding plate 51 and the second shielding plate 52 move outwards synchronously relative to the center of the air inlet 31, the air inlet area of the air inlet 31 is increased, and the requirement of relatively low air volume is met. When the air heater 2 rotates at a high speed, the rotation speed of the axial flow fan blade 6 increases synchronously, and the thrust applied to the sliding plate 7 by the outlet airflow of the axial flow fan blade 6 increases significantly, so as to push the sliding plate 7 to move to the innermost end of the stroke, and meanwhile, the first shielding plate 51 and the second shielding plate 52 move to the outermost end of the stroke respectively, so that the air inlet area of the air inlet 31 is the largest, and the requirement for high air volume is met. Therefore, the air inlet area of the air inlet 31 can be adjusted according to the different rotating speeds of the air heater 2, and the cooking effect is further improved. In the present embodiment, the air heater with two rotation speeds, namely low speed and high speed, is taken as an example for description, but the present invention is also applicable to an air heater with stepless speed change when the air heater is not limited to the air heater with two rotation speeds.
Further, the front end of the fan blade shaft 211 is further sleeved with a compression spring 10, the compression spring 10 is limited between the sliding plate 7 and the hot air baffle 3, in an initial state, the compression spring 10 is in an unstressed state, and in a stressed state of the compression spring 10 (i.e. a pressure applied to the compression spring 10 when the sliding plate 7 slides backwards), the sliding plate 7 can have a tendency of moving forwards along the fan blade shaft 211. By arranging the pressure spring 10, on one hand, the sliding plate 7 can move along the fan blade shaft 211 more stably under the matching action of the thrust of the air outlet flow of the axial flow fan blade 6 and the elastic force of the pressure spring 10, and on the other hand, when the hot air blower 2 and the axial flow fan blade 6 stop rotating, the sliding plate 7 is restored to the initial state under the action of the elastic force of the pressure spring 10. In this embodiment, each of the above-mentioned shielding plates is in a semicircular shape, the radius of each shielding plate is greater than the radius of the air inlet 31, and the center of the circle of the horizontal projection of each shielding plate on the hot air baffle 3 coincides with the center of the air inlet 31 in the state that the air inlet area of the air inlet 31 is the smallest, so that the size of the air inlet area of the air inlet 31 can be better adjusted by moving each shielding plate.
Further, when the outlet airflow of the axial flow fan blade 6 is blown to the sliding plate 7 to push the sliding plate 7 to move backward along the fan blade shaft 211, the outlet airflow of the axial flow fan blade 6 deviates from the direction (flows in the direction parallel to the plane of the air inlet 31), therefore, an air guiding cover 8 extending in the front-back direction is covered on the front surface of the hot air baffle plate 3 at the air inlet 31, the air guiding cover 8 is cylindrical in shape and is arranged with the fan blade shaft 211 as the center, the sliding plate 7 and the pressure spring 10 are both located in the air guiding cover 8, flow guiding holes 81 are arranged on the side wall of the air guiding cover 8 at intervals in the circumferential direction, and a flow guiding surface 70 capable of guiding the airflow to the flow guiding holes 81 is formed on the front surface of the sliding plate 7. Thus, by arranging the wind scooper 8 and arranging the flow guide opening 81 on the wind scooper 8, the outlet air of the axial flow fan blade 6 is guided to the air inlet 31 of the hot air baffle 3 again by the matching action of the flow guide surface 70 on the sliding plate 7 and the flow guide opening 81 on the wind scooper 8, thereby avoiding air volume loss and further improving the air volume of the baking heating structure.
Specifically, in the present embodiment, the diversion port 81 is formed along the axial direction of the wind scooper 8, the sliding plate 7 is disposed along the direction perpendicular to the fan blade shaft 211, the cross section of the sliding plate 7 is circular and protrudes forward, the diversion surface 70 includes a circular first diversion surface 701 located at the center of the front surface of the sliding plate 7, and further includes a second diversion surface 702 formed by extending the periphery of the first diversion surface 70 toward the rear and outside along the circumferential direction to form a circular truncated cone shape. Thus, the air outlet of the axial flow fan 6 is firstly blown onto the first guiding surface 701 horizontally from front to back, then smoothly blown to each guiding opening 81 along the second guiding surface 702, and finally smoothly enters the hot air chamber 30 through the air inlet 31 of the hot air baffle 3. Preferably, the ratio of the area of the cross section of the wind scooper 8, the area of the air inlet 31 of the hot air baffle 3, and the area of the first flow guiding surface 701 of the sliding plate is: 1: 1.8-2.2: 12-15, so that the air outlet of the axial flow fan blade 6 can be better guided to the air inlet 31 through the matching action of the guide surface 70 and the guide opening 81. In this embodiment, the length of each diversion opening 81 along the axial direction of the wind scooper 8 is 2/3 of the length of the wind scooper 8 along the axial direction and is close to the rear end of the wind scooper 8, so that the airflow can be better guided to the air inlet 31.
The linkage mechanism 9 includes a first link rod 91 and a second link rod 92 respectively arranged along the left-right direction, the side wall of the wind scooper 8 is respectively provided with a first position-avoiding opening 821 and a second position-avoiding opening 822 oppositely along the circumferential direction, the first link rod 91 and the second link rod 92 respectively penetrate through the first position-avoiding opening 821 and the second position-avoiding opening 822 and can respectively slide back and forth along the length direction of the corresponding position-avoiding opening, the inner side end of the first link rod 91 is connected with one end of the sliding plate 7 in a vertical rotating manner, the outer side end of the first link rod 91 is connected with the first shielding plate 51 in a vertical rotating manner, the inner side end of the second link rod 92 is connected with the other end of the sliding plate 7 in a vertical rotating manner, and the outer side end of the second link rod 92 is connected with the second shielding plate 52 in a vertical rotating manner. Thus, when the sliding plate 7 moves along the fan blade shaft 211, the connecting rods are driven to move respectively, and thus the first shielding plate 51 and the second shielding plate 52 move along the front surface of the hot air baffle 3 relative to the center of the air inlet 31. In addition, a sliding structure 53 is provided between the rear surface of each of the above-mentioned shutters and the front surface of the hot air baffle 3 along the sliding direction of each shutter, and each sliding structure 53 includes a slider 531 provided at one of the rear surface of the corresponding shutter and the front surface of the hot air baffle 3, and a guide rail 532 provided at the other position for the slider 531 to be fitted and slid back and forth.
Specifically, the left and right end edges of the sliding plate 7 extend rearward along the front-rear direction and then extend horizontally outward to form the first hinge seats 71, and the first rotating shafts 711 are fixed to the corresponding first hinge seats 71 along the vertical direction. In addition, a second hinge seat 54 is fixed at the middle of the front surface of each shutter, a second rotating shaft 541 is vertically fixed on each second hinge seat 54, and each second rotating shaft 541 is vertically and rotatably connected with the outer end of the corresponding connecting rod. Meanwhile, the sliders 531 are fixed to the middle portions of the rear surfaces of the respective shielding plates in the left-right direction, respectively, and the guide rails 532 are fixed to the corresponding portions of the front surfaces of the hot air blocking plates 3 in the left-right direction, respectively.
Preferably, the inner ends of the respective connecting rods are respectively opened with a connecting sliding groove 93 along the length direction thereof, and the respective first rotating shafts 711 are respectively inserted into the corresponding connecting sliding grooves 93 and can slide back and forth along the connecting sliding grooves 93. When the shutters slide to the outermost ends of the strokes respectively, the air inlet area of the air inlet 31 is the largest, the first rotating shafts 711 are located at the inner ends of the corresponding connecting sliding grooves 93, and when the shutters slide to the innermost ends of the strokes respectively, the air inlet area of the air inlet 31 is the smallest, and the first rotating shafts 711 are located at the outer ends of the corresponding connecting sliding grooves 93 respectively. Thus, the connecting slide grooves 93 are arranged on the connecting rods to limit and guide the movement of the sliding plate 7 along the fan blade shaft 211, and the movement of the shielding plates is guided and limited in a reverse regulation mode, so that when the sliding plate 7 is positioned at the foremost end of the stroke, the shielding plates are respectively positioned at the innermost ends of the stroke, and when the sliding plate 7 is positioned at the rearmost end of the stroke, the shielding plates are respectively positioned at the outermost ends of the stroke.
The working process of the invention is as follows:
in the initial state, the hot air blower 2 and the axial flow fan 6 do not rotate, the sliding plate 7 keeps the static state and is located at the foremost end of the stroke, the first shielding plate 51 and the second shielding plate 52 keep the initial positions, that is, the first shielding plate 51 and the second shielding plate 52 are respectively located at the innermost ends of the stroke, at this time, the shielded air inlet holes 311 at the air inlet 31 are the largest, and the area of the air inlet 31 of the hot air baffle 3 is the smallest.
When the air heater 2 rotates at a low speed (i.e. in a low air volume mode), the axial flow fan 6 rotates to generate an air flow which is blown to the sliding plate 7, so that the sliding plate 7 is pushed to move towards the baffle of the air heater 2 (i.e. to move backwards), meanwhile, the direction of the acting force of the pressure spring 10 on the sliding plate 7 is forward, the sliding plate 7 starts to compress the pressure spring 10 by the backward thrust, the sliding plate 7 moves backwards, the sliding plate 7 drives the first connecting rod 91 and the second connecting rod 92 to rotate, and further drives the first shielding plate 51 to move towards the left and the second shielding plate 52 towards the right synchronously, and at this time, the area of the air inlet 31 of the baffle of.
When the air heater 2 rotates at a high speed (i.e. in a high-volume mode), the thrust of the air flow generated by the rotation of the axial-flow fan blade 6 is significantly increased, so that the sliding plate 7 moves backwards to the rearmost end of the stroke, the first shielding plate 51 is at the leftmost end, the second shielding plate 52 is at the rightmost end, the area of the air inlet 31 of the baffle of the air heater 2 is the largest, and meanwhile, the air outlets on the air guide cover 8 are completely opened, so that the air outlet of the axial-flow fan blade 6 can be blown to the air inlet 31 of the baffle of the air heater 2 through the flow guide surface 70 of the sliding plate 7 and the air outlet of the air guide cover 8 to the greatest extent.
Claims (11)
1. A baking heating structure comprises an inner container (1) and an air heater (2), wherein a hot air baffle (3) with an air inlet (31) and an air outlet (32) is arranged at the rear side of the inner container (1), the hot air baffle (3) and a back plate of the inner container (1) enclose a hot air chamber (30), the air heater (2) is arranged on the back plate of the inner container (1), a centrifugal fan blade (21) of the air heater (2) is positioned in the hot air chamber (30), a back heating pipe (4) is arranged around the periphery of the centrifugal fan blade (21), the air inlet (31) is arranged at the center of the hot air baffle (3), the air inlet (31) is a circular array formed by arranging air inlet holes (311) and is arranged opposite to the front and the back of the centrifugal fan blade (21), and the baking heating structure is characterized in that,
the two sides of the air inlet (31) of the hot air baffle (3) are respectively symmetrically provided with a first shielding plate (51) and a second shielding plate (52) which can respectively shield part of air inlet holes (311) of the air inlet (31) by taking the central line as the center, a fan blade shaft (211) of the hot air fan (2) is protruded in front of the hot air baffle (3), the front end of the fan blade shaft (211) is respectively provided with an axial flow fan blade (6) and a sliding plate (7) positioned behind the axial flow fan blade (6), the sliding plate (7) is sleeved on the fan blade shaft (211) and can move along the fan blade shaft (211) under the air outlet pressure of the axial flow fan blade (6),
the sliding plate (7) is linked with each shielding plate through a linkage mechanism (9), when the sliding plate (7) moves towards the hot air baffle plate (3), the first shielding plate (51) and the second shielding plate (52) respectively move outwards along the front surface of the hot air baffle plate (3) relative to the center of the air inlet (31) synchronously, the air inlet area of the air inlet (31) is increased, when the sliding plate (7) moves towards the direction far away from the hot air baffle plate (3), the first shielding plate (51) and the second shielding plate (52) synchronously move inwards along the front surface of the hot air baffle plate (3) relative to the center of the air inlet (31) respectively, the air inlet area of the air inlet (31) is reduced, in the initial state, the first shield plate (51) and the second shield plate (52) are respectively positioned at the innermost ends of the strokes, the air inlet area of the air inlet (31) is the smallest, and the sliding plate (7) is positioned at the foremost end of the strokes.
2. The grilling heating structure as recited in claim 1, wherein a wind scooper (8) extending in a front-back direction is covered on a front surface of said hot wind baffle (3) at said wind inlet (31), said wind scooper (8) is cylindrical in shape and is disposed with said blade shaft (211) as a center, said sliding plate (7) and said compression spring (10) are both disposed in said wind scooper (8), and a side wall of said wind scooper (8) is provided with flow guiding openings (81) at intervals in a circumferential direction, and a flow guiding surface (70) capable of guiding the airflow to said flow guiding openings (81) is formed on the front surface of said sliding plate (7).
3. The grilling heating structure as set forth in claim 2, wherein said flow guide opening (81) is opened along an axial direction of said wind scooper (8), said sliding plate (7) is disposed in a direction perpendicular to said blade axis (211), and a cross section of said sliding plate (7) is circular and convex forward, said flow guide surface (70) comprises a circular first flow guide surface (701) located at a center of a front surface of said sliding plate (7), and further comprises a circular second flow guide surface (702) formed by extending a peripheral edge of said first flow guide surface (701) in a circumferential direction rearward and outward.
4. A grill heating structure according to claim 3, wherein a ratio of a cross-sectional area of the wind scooper (8), an area of the wind inlet (31) of the hot wind blocking plate (3) and an area of the first flow guide surface (701) of the sliding plate (7) is: 1: 1.8-2.2: 12-15.
5. A grill heating structure according to any of claims 2 to 4 wherein the linkage mechanism (9) comprises a first link (91) and a second link (92), a first avoidance port (821) and a second avoidance port (822) are respectively and oppositely arranged on the side wall of the air guide cover (8) along the circumferential direction, the first connecting rod (91) and the second connecting rod (92) are respectively arranged in the first avoidance port (821) and the second avoidance port (822) in a penetrating way and can respectively slide back and forth along the length direction of the corresponding avoidance ports, and one end of the first connecting rod (91) is rotatably connected with one end of the sliding plate (7), and the other end of the first connecting rod (91) is rotatably connected with the first shutter (51), one end of the second connecting rod (92) is rotatably connected with the other end of the sliding plate (7), and the other end of the second connecting rod (92) is rotatably connected with the second shutter (52).
6. A grill heating structure according to claim 5, wherein a sliding structure (53) is provided between a rear surface of each of the shutters and a front surface of the hot air blocking plate (3) in a sliding direction of each of the shutters, and each of the sliding structures (53) includes a slider (531) provided at one of the rear surface of the corresponding shutter and the front surface of the hot air blocking plate (3), and a guide rail (532) provided at the other for the slider (531) to be fitted and slid back and forth.
7. The grill heating structure according to claim 5, wherein the sliding plate (7) has first hinge seats (71) fixed to both ends thereof, the first hinge seats (71) have first rotation shafts (711) fixed thereto, the inner ends of the connecting rods have connecting sliding grooves (93) formed along the length direction thereof, the first rotation shafts (711) are inserted into the corresponding connecting sliding grooves (93) and can slide back and forth along the connecting sliding grooves (93),
when the shielding plates respectively slide to the outermost ends of the strokes, the air inlet area of the air inlet (31) is the largest, the first rotating shafts (711) are respectively positioned at the inner side ends of the corresponding connecting sliding grooves (93), when the shielding plates respectively slide to the innermost ends of the strokes, the air inlet area of the air inlet (31) is the smallest, and the first rotating shafts (711) are respectively positioned at the outer side ends of the corresponding connecting sliding grooves (93).
8. A grill heating structure according to any of claims 1 to 4, wherein the front end of the fan blade shaft (211) is further sleeved with a compression spring (10), the compression spring (10) is limited between the sliding plate (7) and the hot air baffle (3), in an initial state, the compression spring (10) is in an unstressed state, and in a stressed state of the compression spring (10), the sliding plate (7) has a tendency to move forward along the fan blade shaft (211).
9. A grill heating structure according to any one of claims 1 to 4, wherein each of the plurality of louvers has a semicircular shape, the radius of each louver is larger than the radius of the air inlet (31), and the center of a circle of a horizontal projection of each louver on the hot air baffle (3) coincides with the center of the air inlet (31) in a state where the air inlet area of the air inlet (31) is the smallest.
10. A grill heating structure according to any of claims 1 to 4, wherein the air heater (2) further comprises a motor (22) installed on the rear surface of the back plate of the inner container (1), a motor shaft (221) of the motor (22) is installed through the back plate of the inner container (1) in the front-back direction, a driving gear (2211) is installed on the motor shaft (221), a driven gear (2111) engaged with the driving gear (2211) is installed at the rear end of the fan blade shaft (211), and the transmission ratio of the driving gear (2211) to the driven gear (2111) is greater than 1.2.
11. An electric oven characterized by having the grilling heating structure according to any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110119191.3A CN112901531B (en) | 2021-01-28 | 2021-01-28 | Baking heating structure and electric oven with same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110119191.3A CN112901531B (en) | 2021-01-28 | 2021-01-28 | Baking heating structure and electric oven with same |
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| CN112901531A true CN112901531A (en) | 2021-06-04 |
| CN112901531B CN112901531B (en) | 2022-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114052528A (en) * | 2021-12-15 | 2022-02-18 | 广东美的厨房电器制造有限公司 | Cooking utensil |
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| US20190365152A1 (en) * | 2018-05-31 | 2019-12-05 | North Atlantic Imports, Llc | Outdoor cooking station with multiple independent cooking modes and method thereof |
| CN110558821A (en) * | 2019-09-15 | 2019-12-13 | 宁波方太厨具有限公司 | hot air baffle and cooking device with same |
| US20190387921A1 (en) * | 2018-06-20 | 2019-12-26 | Creator, Inc. | Forced-Air Food-Heating Apparatus |
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| CN110094366A (en) * | 2018-01-31 | 2019-08-06 | 宁波方太厨具有限公司 | A kind of hot-air damper and application have the oven of the hot-air damper |
| US20190365152A1 (en) * | 2018-05-31 | 2019-12-05 | North Atlantic Imports, Llc | Outdoor cooking station with multiple independent cooking modes and method thereof |
| US20190387921A1 (en) * | 2018-06-20 | 2019-12-26 | Creator, Inc. | Forced-Air Food-Heating Apparatus |
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| CN114052528A (en) * | 2021-12-15 | 2022-02-18 | 广东美的厨房电器制造有限公司 | Cooking utensil |
| CN114052528B (en) * | 2021-12-15 | 2023-11-21 | 广东美的厨房电器制造有限公司 | Cooking utensil |
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| CN112901531B (en) | 2022-02-18 |
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