An oven that heats evenly

Abstract

The present invention relates to an oven with uniform heating, comprising an inner container, wherein a tray for placing food to be cooked is arranged on the inner bottom surface of the inner container, and a bottom heating device capable of heating the tray is also arranged on the bottom surface of the inner container, and the tray and the bottom heating device can rotate relative to each other. Compared with the prior art, the present invention can heat the food on the tray evenly through the relative rotation of the tray and the bottom heating device, and the tray can be used for cooking barbecued food, and can also be used for baking egg tarts, cookies, bread and other foods, and has a wider applicability.

Description

Technical Field

[0001] The invention relates to the field of ovens, and in particular to an oven with uniform heating. Background Art

[0002] An oven is an electric heating device that uses radiant heat from an electric heating element to heat food. In order to heat the food in the oven cooking chamber evenly, the following two methods are generally used: (1) a rotating grill / rotating fork is provided in the cooking chamber so that the food fixed on the rotating grill / rotating fork is heated evenly; (2) a hot fan is used to circulate hot air in the cooking chamber to improve the temperature uniformity in the oven cooking chamber, so that the food in the cooking chamber can be heated evenly.

[0003] However, the above two methods have the following problems: the first method is only suitable for baking specific barbecue foods, such as whole chickens, meat skewers, etc., but has no improvement for baking foods such as egg tarts, cookies, and bread slices; the second method relies on the hot air flow direction of the hot air to achieve temperature uniformity in the oven cooking chamber, and there is still an uneven temperature problem in the same layer of the oven when cooking food. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an oven with uniform heating in view of the prior art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: an oven with uniform heating, including an inner pot, characterized in that a plate for placing food to be cooked is arranged on the inner bottom surface of the inner pot, and a bottom heating device capable of heating the plate is also arranged on the bottom surface of the inner pot, and the plate and the bottom heating device can rotate relative to each other.

[0006] For the convenience of setting and to make the food on the plate body heated more evenly, the plate body is rotatably arranged on the inner bottom surface of the inner pot, and the bottom heating device is fixed on the inner bottom surface of the inner pot.

[0007] The bottom heating device can be implemented in a variety of ways. Preferably, the bottom heating device is a circular thick film heating plate, the disk body is a disc, and the size of the bottom heating device matches the disk body and is concentrically arranged.

[0008] Furthermore, preferably, a support seat is also provided on the inner bottom surface of the inner pot, the lower end of the support seat is fixed on the inner bottom surface of the inner pot, and the upper end thereof is fixedly supported on the bottom of the above-mentioned bottom heating device, and a central hole is opened on the support seat which passes through the central hole, and a rotating shaft driven by a rotating motor is fixed at the center of the above-mentioned disc body after passing through the central hole.

[0009] Preferably, the top surface and the back surface of the inner tank are respectively provided with a top heating device and a back heating device, and also include a hot air baffle and a centrifugal fan arranged in the inner tank, the hot air baffle is arranged on the back surface of the inner tank from top to bottom, the upper end of the hot air baffle is provided with a hot air hood, and the hot air baffle part at the lower end of the hot air hood is a hot air guide plate, the above-mentioned centrifugal fan and the back heating device are both arranged in the hot air hood, a hot air inlet is provided on the hot air hood, and the hot air inlet is adjacent to the top surface of the inner tank, the upper layer of hot air in the inner tank enters the hot air hood through the hot air inlet, and under the action of the centrifugal force of the centrifugal fan, the upper layer of hot air in the inner tank enters the hot air hood through the hot air inlet, and enters the hot air flow channel surrounded by the hot air guide plate through the air outlet of the hot air hood under the action of the centrifugal force of the centrifugal fan, the width of the above-mentioned hot air guide plate increases from top to bottom, and the plate body of the hot air guide plate at the air outlet adjacent to the hot air hood is inclined from top to bottom toward the back surface of the inner tank, and after inclining to a certain angle, it extends downward and is parallel to the above-mentioned inner tank, and a hot air outlet is provided on the extension section. In this way, based on the close-range radiation heating of the bottom heating device, the long-range radiation heating of the top heating device and the back heating device cooperate with the centrifugal fan to form circulating hot air for forced convection, so that the food on the plate can be heated more evenly.

[0010] In order to make the hot air thrown out by the hot air hood flow more evenly in the hot air flow channel, the hot air hood is in the shape of a volute, and a hot air baffle wall extending along its tangent direction is formed at its air outlet, and one end of the hot air deflector connected to the hot air hood forms an air guiding channel and an air induction channel separated by the hot air baffle wall, and the other side walls of the air guiding channel and the air induction channel are respectively inclined outward from top to bottom, and the extension direction of the air guiding channel is toward the air outlet direction of the hot air hood, wherein the air guiding channel is connected to the air induction channel, and the top wall of the air guiding channel is evenly inclined from top to bottom toward the back side of the inner tank, and the top wall of the air induction channel is parallel to the back side of the inner tank. In this way, the hot air thrown out by the hot air hood enters the air guide channel. Since the top wall of the air guide channel is evenly inclined from top to bottom toward the back of the inner tank, part of the hot air is squeezed and poured into the air induced channel. The hot air entering the hot air flow channel is divided into two layers by the above-mentioned hot air blocking wall, one layer is led downward through the air guide channel along the original tangential direction of the centrifugal fan, and the other layer is led to the lower right along the air induced channel, so that the hot air is distributed as evenly as possible along the width direction of the hot air flow channel, and then flows smoothly along the extension section, and finally blown out evenly from the hot air outlet.

[0011] In order to allow the hot air from the upper layer of the inner tank to enter the hot air hood as much as possible, the hot air inlet is a group of holes opened on the front side of the hot air hood. The holes are arranged in a circular array and concentrically arranged with the centrifugal fan. The holes of the hot air inlet are radial from the inside to the outside, and the aperture increases from the inside to the outside.

[0012] In order to allow the hot air after the centrifugal action of the centrifugal fan to be thrown out smoothly from the air outlet of the hot air hood, the centrifugal fan is eccentrically arranged relative to the hot air hood, and the back heating device is a circular heating tube, and the back heating device is concentrically arranged with the centrifugal fan. The profile of the volute-shaped hot air hood is an Archimedean spiral, so that the cross-section of the hot air hood is continuously expanded and reaches the maximum at the air outlet, so that the airflow can flow out smoothly and prevent the hot air flow from being squeezed at the air outlet to cause pressure loss.

[0013] In order to make the hot air flow be more uniformly led out from the hot air outlet, the hot air outlet is a long hole opened along the width direction of the hot air baffle, and the lower hole edge of the long hole extends inward along the length direction to form a hot air guide strip. When the hot air flow moves to the hot air outlet, since the hot air outlet is a long hole, the flow rate of the hot air flow can be increased and its wind pressure can be increased. At the same time, it is guided by the hot air guide strip, so that the hot air can be blown out from the hot air outlet more uniformly.

[0014] Preferably, the angle formed by the hot air guide strip and the surface of the hot air baffle on which it is located is 70° to 80° (preferably 75°), so that the hot air blown out of the hot air outlet can flow out in a nearly horizontal direction, thereby flowing in layers and evenly in the inner pot, thereby evenly heating the food on the plate.

[0015] Further, preferably, there are two hot air outlets, and the two hot air outlets are arranged at intervals in the upper and lower parts, and the tray body is opposite to the middle parts of the two hot air outlets; wherein the height of the hot air guide bar in the upper hot air outlet is lower than the hot air guide bar in the other hot air outlet. In this way, the hot air evenly blown out by the hot air outlet can flow evenly up and down the tray body, thereby evenly heating the food on the tray body. In addition, the hot air that has not passed through the upper hot air guide bar can be blown to the lower hot air outlet through the gap between the hot air guide bar and the back of the inner pot, and blow through the baking tray located at the lower layer under the guidance of the lower hot air guide bar.

[0016] Compared with the prior art, the advantages of the present invention are: a tray for placing food to be cooked is arranged on the inner bottom surface of the inner pot, and a bottom heating device capable of heating the tray is also arranged on the bottom surface of the inner pot, and the tray and the bottom heating device can rotate relative to each other. Thus, the food on the tray can be heated evenly through the relative rotation of the tray and the bottom heating device, and the tray can be used for cooking barbecued food, and can also be used for baking egg tarts, cookies, bread and other foods, and has a wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the oven in Example 1 of the present invention;

[0018] Figure 2 for Figure 1 The enlarged view of part I;

[0019] Figure 3 This is a schematic diagram of the structure of the thick film heating plate in Example 1 of the present invention;

[0020] Figure 4 This is a partial structural exploded view of the inner pot in Example 1 of the present invention (the plate body and the bottom heating device are omitted);

[0021] Figure 5 This is a schematic diagram of the structure of the hot air baffle in Example 1 of the present invention;

[0022] Figure 6 for Figure 5 A schematic diagram of the structure in another direction;

[0023] Figure 7 for Figure 5 A schematic diagram of the structure in another direction;

[0024] Figure 8 for Figure 6 Cross-sectional view along direction BB;

[0025] Fig. 9 Schematic diagram of the flow direction of hot air flow in the hot air baffle in Example 1 of the present invention;

[0026] Fig.10 It is a schematic diagram of the partial structure of the oven in Example 2 of the present invention;

[0027] Fig.11 This is a schematic diagram of the structure of a bottom plate with holes according to Embodiment 2 of the present invention;

[0028] Fig.12 This is a wind field simulation diagram of the hot air baffle in Example 1 of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings.

[0030] Embodiment 1:

[0031] like Figures 1 to 9 , an oven with uniform heating, comprising an inner pot 1, a tray 21 for placing food to be cooked is arranged on the inner bottom surface of the inner pot 1, and a bottom heating device 22 for heating the tray 21 is also arranged on the bottom surface of the inner pot 1, and the tray 21 and the bottom heating device 22 can rotate relative to each other. In this embodiment, the tray 21 is a transparent glass tray, so that the daily cleaning of the tray 21 is convenient.

[0032] Specifically, the disk body 21 is rotatably arranged on the inner bottom surface of the inner pot 1, and the bottom heating device 22 is fixed on the inner bottom surface of the inner pot 1. Furthermore, the bottom heating device 22 is a thick film heating plate, which is formed by printing a heating resistor wire 223 on the surface of a stainless steel substrate 221 by screen printing technology, and then covering the surface with a layer of insulating film protective layer 222. The total thickness is 0.5mm, and the maximum power P is 6000W. In this embodiment, the power P is preferably 1200W. The printed circuit of the heating resistor wire 223 of the thick film heating plate can be any shape required by the composite, and its minimum bending radius is 1mm. In this embodiment, the thick film heating plate is circular. The disk body 21 is a circular disk, and the size of the bottom heating device 22 matches the disk body 21 and is concentrically arranged.

[0033] Furthermore, a support base 23 is provided on the inner bottom surface of the inner pot 1, the lower end of the support base 23 is fixed on the inner bottom surface of the inner pot 1, and the upper end thereof is fixedly supported on the bottom of the bottom heating device 22, and a central hole (not shown) is provided on the support base 23 which passes through the central hole, and a rotating shaft 24 driven by a rotating motor 25 is connected to the center of the plate 21 after passing through the central hole. In this embodiment, the outer periphery of the inner pot 1 is wrapped with heat-insulating cotton 10, and the rotating motor 25 is arranged outside the heat-insulating cotton 10, and the number of revolutions of the rotating motor 25 is 100r / min.

[0034] The top surface and the back surface of the inner pot 1 are respectively provided with a top heating device 3 and a back heating device 5, and in this embodiment, the top heating device 3 and the back heating device 5 are both heating tubes. A hot air baffle 4 and a centrifugal fan 6 are also provided in the inner pot 1, wherein the centrifugal fan 6 is driven by a fan motor 7 provided outside the inner pot 1.

[0035] The hot air baffle 4 is arranged on the back of the inner liner 1 from top to bottom, and the upper end of the hot air baffle 4 has a hot air cover 41, and the hot air baffle part at the lower end of the hot air cover 41 is a hot air deflector 42. The centrifugal fan 6 and the back heating device 5 are both arranged in the hot air cover 41, wherein the back heating device 5 is a circular heating tube, and the back heating device 5 surrounds the outer periphery of the centrifugal fan 6 and is arranged concentrically with the centrifugal fan 6. Further, a hot air inlet 411 is provided on the hot air cover 41, and the hot air inlet 411 is adjacent to the top surface of the inner liner 1. The upper layer of hot air in the inner liner 1 enters the hot air cover 41 through the hot air inlet 411, and after being heated twice by the back heating device 5 in the hot air cover 41, it then enters the hot air flow channel 420 surrounded by the hot air deflector 42 through the air outlet 412 of the hot air cover 41 under the action of the centrifugal force of the centrifugal fan 6.

[0036] Furthermore, the width of the above-mentioned hot air deflector 42 increases from top to bottom (from 165mm to 310mm from the upper end to the lower end), and the plate body of the hot air deflector 42 at the air outlet 412 adjacent to the hot air hood 41 is inclined from top to bottom toward the back of the inner tank 1, and after inclining to a certain angle, extends downward and parallel to the above-mentioned inner tank 1, and a hot air outlet 421 is opened on the extended section.

[0037] The hot air in the upper layer of the inner pot 1 heated by the top heating device 3 enters the hot air cover 41 through the hot air inlet 411. In the hot air cover 41, due to the centrifugal effect of the centrifugal fan 6, the hot air enters the hot air flow channel 420 through the air outlet 412 of the hot air cover 41. In the hot air flow channel 420, the width of the hot air guide plate 42 increases from top to bottom, and the plate body of the hot air guide plate 42 adjacent to the air outlet 412 of the hot air cover 41 is inclined from top to bottom toward the back of the inner pot 1, and after being inclined to a certain angle, it extends downward and is parallel to the inner pot 1. A hot air outlet 421 is provided on the extension section, so that part of the hot air entering the hot air flow channel 420 from the air outlet 412 of the hot air hood 41 will inevitably be squeezed to the side of the hot air guide plate 42, thereby at least partially reversing the uneven distribution of the hot air entering the hot air flow channel 420 caused by the centrifugal action in the hot air hood 41, so that the hot air can flow to the hot air outlet 421 as evenly as possible, thereby achieving uniformity of air outlet from the hot air outlet 421, ultimately ensuring the temperature uniformity inside the oven and achieving uniform heating of the food on the tray 21.

[0038] Specifically, in the present embodiment, the hot air hood 41 has a volute-shaped outer shape, and a hot air baffle wall 45 extending along its tangent direction is formed at its air outlet 412, and one end of the hot air deflector 42 connected to the hot air hood 41 forms an air guiding channel 43 and an air induction channel 44 separated by the hot air baffle wall 45, and the other side walls of the air guiding channel 43 and the air induction channel 44 are respectively inclined outwardly from top to bottom, and the extension direction of the air guiding channel 43 is toward the air outlet direction of the hot air hood 41, wherein the air guiding channel 43 is connected to the air induction channel 44, and the top wall of the air guiding channel 43 is uniformly inclined from top to bottom toward the back side of the inner tank 1 (the inclination angle relative to the horizontal plane is 160°, and the height is reduced from 30 mm to 8 mm), and the top wall of the air induction channel 44 is parallel to the back side of the inner tank 1. In this way, the hot air thrown out by the hot air hood 41 enters the air guide channel 43. Since the top wall of the air guide channel 43 is evenly inclined from top to bottom toward the back of the inner tank 1, part of the hot air is squeezed and flows into the air induction channel 44. The hot air entering the hot air flow channel 420 is divided into two layers by the above-mentioned hot air blocking wall 45, one layer is led downward through the air guide channel 43 along the original tangential direction of the centrifugal fan 6, and the other layer is led to the lower right along the air induction channel 44, so that the hot air is distributed as evenly as possible along the width direction of the hot air flow channel 420, and then flows smoothly along the extension section, and finally blown out evenly from the hot air outlet 421.

[0039] In this embodiment, the hot air inlet 411 is a group of holes opened on the front of the hot air cover 41, which are arranged in a circular array and are concentrically arranged with the centrifugal fan 6. The holes of the hot air inlet 411 are radial from the inside to the outside, and the hole diameter increases from the inside to the outside. Therefore, the hot air on the upper layer of the inner tank 1 can enter the hot air cover 41 as much as possible.

[0040] In order to allow the hot air after the centrifugal action of the centrifugal fan 6 to be smoothly thrown out from the air outlet 412 of the hot air hood 41, the centrifugal fan 6 is eccentrically arranged relative to the hot air hood 41, and the back heating device 5 is a circular heating tube, and the back heating device 5 is concentrically arranged with the centrifugal fan 6. The profile of the volute-shaped hot air hood 41 is an Archimedean spiral, so that the cross-section of the hot air hood 41 is continuously expanded and reaches the maximum at the air outlet 412, so that the airflow can flow out smoothly and prevent the hot air flow from being squeezed at the air outlet 412 to cause pressure loss.

[0041] In the present embodiment, in order to allow the hot air flow to be further uniformly drawn out from the hot air outlet 421, the hot air outlet 421 is a long hole opened along the width direction of the hot air baffle 4, and the lower hole edge of the long hole extends inward along the length direction to form a hot air guide 423. When the hot air flow moves to the hot air outlet 421, since the hot air outlet 421 is a long hole, the flow rate of the hot air flow can be accelerated and its wind pressure can be increased. At the same time, it is guided by the hot air guide 423, so that the hot air can be blown out from the hot air outlet 421 more uniformly. In addition, since the dish body 21 is placed horizontally in the inner pot 1, in order for the hot air blown out from the hot air outlet 421 to better heat the food on the dish body 21, the angle formed by the hot air guide 423 and the plate surface of the hot air baffle 4 where it is located is 70°~80° (preferably 75° in the present embodiment, if Fig.10 As shown in angles α and β, the hot air blown out of the hot air outlet 421 can flow out in a nearly horizontal direction and evenly blow over the food on the tray 21.

[0042] Furthermore, there are two hot air outlets 421, and the two hot air outlets 421 are arranged in parallel and spaced apart from each other, wherein the height (H1) of the hot air guide 423 of the upper hot air outlet 421 is lower than the height (H2) of the hot air guide 423 of the other hot air outlet 421, so that a hot air gap 422 is formed between the upper hot air guide 423 and the back of the inner pot 1, and preferably, H1 is 1 / 3 of the height of H2. In this way, the hot air that has not passed through the upper hot air guide 423 can be blown to the lower hot air outlet 421 through the hot air gap 422, and blow through the baking tray located at the lower layer under the guidance of the lower hot air guide 423. Furthermore, in this embodiment, the distance between the upper hot air outlet 421 and the air outlet 412 of the hot air hood 41 is 120 mm, and the distance between the two hot air outlets 421 is 44 mm, and the area of ​​the upper hot air outlet 421 is 1342 mm 2 The area of ​​the hot air outlet 421 at the bottom is 2013mm 2 , and the air volume of the hot air outlet 421 located at the upper part is 0.11kg / s, while the air volume of the hot air outlet 421 located at the lower part is 0.12kg / s, and the upper and lower hot air outlets 421 have uniform air flow. Fig.12 The above-mentioned tray body 21 is opposite to the middle of the two hot air outlets 421, so that the hot air outlet 421 located above the tray body 21 (about 5 mm higher than the top placement surface of the tray body 21) can blow the wind evenly across the top placement surface of the tray body 21, and the hot air outlet 421 located below the tray body 21 (about 5 mm lower than the bottom surface of the tray body 21) can blow the wind evenly across the gap between the tray body 21 and the bottom heating device 22, thereby cooperating with the bottom heating device 22 to heat the food on the tray body 21.

[0043] As can be seen from the above, the oven of the present invention is provided with a rotatable disk body 21. The hot air with high wind speed and large flow rate from the two hot air outlets 421 can be blown to the door body of the oven, and affected by the negative pressure area inside the hot air hood 41, the hot air flows to the hot air inlet 411 of the hot air hood 41 above the door body, thereby forming a large hot air circulation inside the oven, uniformly covering the disk body 21, and uniformly heating the food on the disk body 21.

[0044] Embodiment 2:

[0045] like Fig.10 and 11 As shown, different from Example 1, in this embodiment, a perforated bottom plate 26 is provided on the plate body 21 , and a plug hole 261 for fixing the skewers is provided on the perforated bottom plate 26 , so that the skewers can be evenly heated on the plate body 21 .

Claims

1. An oven with uniform heating, comprising an inner container, characterized in that: A tray (21) for placing food to be cooked is arranged on the inner bottom surface of the inner pot (1), and a bottom heating device (22) capable of heating the tray (21) is also arranged on the bottom surface of the inner pot (1), and the tray (21) and the bottom heating device (22) are capable of rotating relative to each other; The top surface and the back surface of the inner container (1) are respectively provided with a top heating device (3) and a back heating device (5). The invention also comprises a hot air baffle (4) and a centrifugal fan (6) arranged in the inner container (1), wherein the hot air baffle (4) is arranged on the back side of the inner container (1) from top to bottom, the upper end of the hot air baffle (4) has a hot air cover (41), and the hot air baffle (4) part at the lower end of the hot air cover (41) is a hot air guide plate (42), and the centrifugal fan (6) and the back heating device (5) are both arranged in the hot air cover (41). The hot air hood (41) is provided with a hot air inlet (411), and the hot air inlet (411) is adjacent to the top surface of the inner liner (1). The upper layer of hot air in the inner liner (1) can enter the hot air hood (41) through the hot air inlet (411), and can enter the hot air flow channel (420) surrounded by the hot air guide plate (42) through the air outlet (412) of the hot air hood (41) under the action of the centrifugal force of the centrifugal fan (6). The width of the hot air deflector (42) increases from top to bottom, and the plate body of the hot air deflector (42) at the air outlet (412) adjacent to the hot air cover (41) is inclined from top to bottom toward the back of the inner liner (1), and after being inclined to a certain angle, extends downward and is parallel to the inner liner (1), and a hot air outlet (421) is provided on the extended section; The hot air hood (41) has a volute-shaped outer shape, and a hot air blocking wall (45) extending in a tangential direction thereof is formed at the air outlet (412); an end of the hot air deflector (42) connected to the hot air hood (41) forms an air guiding channel (43) and an air induction channel (44) separated by the hot air blocking wall (45); the other side walls of the air guiding channel (43) and the air induction channel (44) are inclined outward from top to bottom, respectively; and the extension direction of the air guiding channel (43) is toward the air outlet direction of the hot air hood (41). The air guiding channel (43) is connected to the air induction channel (44), and the top wall of the air guiding channel (43) is evenly inclined from top to bottom toward the back of the inner container (1), while the top wall of the air induction channel (44) is parallel to the back of the inner container (1); The centrifugal fan (6) is eccentrically arranged relative to the hot air cover (41), the back heating device (5) is a circular heating tube, and the back heating device (5) surrounds the outer periphery of the centrifugal fan (6) and is arranged concentrically with the centrifugal fan (6); The hot air outlet (421) is a long hole opened along the width direction of the hot air baffle (4), and the lower hole edge of the long hole extends inward along the length direction to form a hot air guide strip (423); The angle formed between the hot air guide strip (423) and the plate surface of the hot air baffle plate (4) on which it is located is 70° to 80°; There are two hot air outlets (421), and the two hot air outlets (421) are arranged in parallel and spaced apart from each other, and the height of the hot air guide bar (423) located at the upper hot air outlet (421) is lower than the hot air guide bar (423) in the other hot air outlet (421), thereby forming a hot air gap (422) between the upper hot air guide bar (423) and the back side of the inner container (1); The disk body is opposite to the middle of the two hot air outlets (421), and a horizontal gap is left between the disk body and the bottom heating device, and the air outlet of the lower hot air outlet (421) can blow through the horizontal gap.

2. The oven according to claim 1, characterized in that: The disk (21) is rotatably arranged on the inner bottom surface of the inner pot (1), and the bottom heating device (22) is fixed on the inner bottom surface of the inner pot (1).

3. The oven according to claim 2, characterized in that: The bottom heating device (22) is a circular thick film heating plate, and the disk body (21) is a horizontally arranged circular disk. The size of the bottom heating device (22) matches that of the disk body 21 and they are arranged concentrically.

4. The oven according to claim 3, characterized in that: A support seat (23) is also provided on the inner bottom surface of the inner pot (1), the lower end of the support seat (23) is fixed on the inner bottom surface of the inner pot (1), and the upper end is fixedly supported on the bottom of the bottom heating device (22). A central hole is provided on the support seat (23) and passes through the central hole. A rotating shaft (24) driven by a rotating motor (25) passes through the central hole and is connected to the center of the plate (21).

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