CN111700517B

CN111700517B - Oven with uniform same-layer temperature field and same-layer temperature field control method thereof

Info

Publication number: CN111700517B
Application number: CN202010387990.4A
Authority: CN
Inventors: 蒋圣伟
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-05-09
Filing date: 2020-05-09
Publication date: 2022-01-14
Anticipated expiration: 2040-05-09
Also published as: CN111700517A

Abstract

The invention relates to an oven with uniform same-floor temperature field and a control method thereof, which comprises an inner container, wherein a hot air baffle is arranged at the rear side of the inner container, the hot air baffle and a back plate of the inner container enclose a hot air chamber, a hot air fan and a back heating pipe arranged at the periphery of a fan blade of the hot air fan are arranged in the hot air chamber, an air inlet opposite to the front and back of the fan blade of the hot air fan is arranged in the middle of the hot air baffle, a left air outlet and a right air outlet are respectively arranged at the left side and the right side of the air inlet on the hot air baffle, a left shielding plate capable of horizontally moving relative to the left air outlet is arranged on the left air outlet, and a right shielding plate capable of horizontally moving relative to the right air outlet is arranged on the right air outlet. The invention can realize the uniformity of the baking tray in the same-layer temperature field, thereby ensuring the baking effect. According to the control method of the same-layer temperature field, the uniformity of the temperature field of the left area and the right area of the food is better realized by combining the left temperature difference and the right temperature difference of the same layer with the position of the food, and moving the left shutter and the right shutter.

Description

Oven with uniform same-layer temperature field and same-layer temperature field control method thereof

Technical Field

The invention relates to the field of ovens, in particular to an oven with a uniform same-layer temperature field and a control method of the same-layer temperature field.

Background

The heating system of current oven generally includes heating pipe assembly, air heater and hot-blast baffle, wherein heating pipe assembly is including setting up the top heating pipe at inner bag inner top surface, set up at the dorsal back heating pipe of inner bag and set up the bottom heating pipe in the inner bag bottom, above-mentioned hot-blast baffle sets up the dorsal part at the inner bag, and seted up air intake and air outlet on this hot-blast baffle, this hot-blast baffle encloses into hot-blast room with the backplate of inner bag, above-mentioned air heater sets up in this hot-blast room, and the appearance of above-mentioned back heating pipe is the ring form and encloses the periphery of establishing the flabellum at the air heater. The heating pipe assembly, the air heater and the hot air baffle work in a matched mode to enable hot air circulation to be formed in the inner container, and food is heated through hot air.

When baking, a user places food on the baking tray, and then puts the baking tray into the inner container. Because the user is in the in-process of placing food on the overware, the position in the overware of food probably is to left, right or bilateral symmetry, and air intake and the air outlet that hot-blast baffle was gone into is usually according to the food symmetrical design of placing, and when food was placed to the left or right side, the regional temperature difference in the left and right sides of food was great, leads to food to toast the effect relatively poor.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide an oven with a uniform temperature field at the same layer.

The second technical problem to be solved by the present invention is to provide a method for controlling the same-layer temperature field of the oven in view of the prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides an even oven in same floor temperature field, includes the inner bag, and the rear side of this inner bag is provided with hot-blast baffle, and this hot-blast baffle encloses into hot-blast room with the backplate of inner bag, is provided with the air heater in this hot-blast room and encloses the back heating pipe of establishing in the flabellum periphery of this air heater, and the middle part of above-mentioned hot-blast baffle is provided with the air intake relative around with the flabellum of above-mentioned air heater, its characterized in that, be provided with left air outlet and right air outlet respectively in the left and right sides of above-mentioned air intake on the hot-blast baffle, wherein, be provided with the left sunshade that can control the translation for this left air outlet on this left air outlet, be provided with the right sunshade that can control the translation for this right air outlet on the right air outlet.

In order to better drive the left and right shielding plates to move along the left and right directions, the invention also comprises a left driving structure and a right driving structure which can respectively drive the left shielding plate and the right shielding plate to move, the left driving structure comprises a left motor and a transversely arranged left telescopic rod, one end of the left telescopic rod is fixed with an output shaft of the left motor, the other end of the left telescopic rod is fixed with the left shielding plate, the right driving structure comprises a right motor and a transversely arranged right telescopic rod, one end of the right telescopic rod is fixed with an output shaft of the right motor, the other end of the right telescopic rod is fixed with the right shielding plate, and the left motor and the right motor are respectively connected with a control plate of the oven through electric signals.

Furthermore, the left and right curtain plates are respectively arranged on the back of the hot air baffle, the left and right motors are respectively arranged on the left and right sides of the inner container, and the left and right telescopic rods respectively penetrate through the left and right side walls of the inner container and are connected with the left and right curtain plates.

For the temperature of the food left and right areas can be better collected, a left temperature sensor is arranged on the left side surface of the inner container, a right temperature sensor is arranged on the right side surface of the inner container, and each temperature sensor is respectively connected with a control panel electric signal of the oven. Therefore, the temperature of the left and right regions of food can be detected in real time through the left and right temperature sensors and is conveyed to the control panel, and the control panel can drive the corresponding telescopic rods to stretch and retract by controlling the corresponding motors so as to enable the corresponding shielding plates to act.

Furthermore, a camera electrically connected with a control panel of the oven is arranged on the inner top surface of the inner container. Like this through the camera can real-time detection food place position signal and carry for the control panel, and the control panel can drive the telescopic link that corresponds through the motor that the control corresponds and stretch out and draw back and make the sunshade action that corresponds.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the same-layer temperature field control method of the oven is characterized in that the detection temperature of the left temperature sensor is recorded as T_{Left side of}And the right temperature sensor detects the temperature as T_{Right side}The normal fluctuation deviation of the temperature of the same layer of the baking tray is a temperature threshold value T_Threshold(s)The initial state of the left shield plate is to shield half of the left air outlet, and the initial state of the right shield plate is to shield half of the right air outlet;

the oven starts to work, the left temperature sensor, the right temperature sensor and the camera are respectively provided with a sample, and the collected signals are respectively fed back to the control panel,

if | T_{Left side of}-T_{Right side}∣≤T_Threshold(s)The left and right shielding plates do not move;

if T_{Left side of}-T_{Right side}＞T_Threshold(s)When food is placed to the left relative to the baking tray, the left shielding plate moves leftwards from the initial position, the effective air outlet area of the left air outlet is reduced, and meanwhile, the right shielding plate moves rightwards from the initial position until the right air outlet is completely shielded; when food is placed to the right relative to the baking tray, the left shielding plate moves leftwards from the initial position to the left air outlet and is completely shielded, and meanwhile, the right shielding plate moves leftwards from the initial position to increase the effective air outlet area of the right air outlet; when the food is placed in bilateral symmetry relative to the baking tray, the left shielding plate moves leftwards relative to the initial position of the left shielding plate to reduce the effective air outlet area of the left air outlet, and the right shielding plate moves leftwards relative to the initial position of the right shielding plate to increase the effective air outlet area of the right air outlet;

if T_{Right side}-T_{Left side of}＞T_Threshold(s)When food is placed to the left relative to the baking tray, the left shielding plate moves rightwards from the initial position, the effective air outlet area of the left air outlet is increased, and meanwhile, the right shielding plate moves rightwards from the initial position until the right air outlet is completely shielded; when food is placed to the right relative to the baking tray, the left shielding plate moves leftwards from the initial position to the left air outlet and is completely shielded, and meanwhile, the right shielding plate moves rightwards from the initial position to reduce the effective air outlet area of the right air outlet; when the food is placed in bilateral symmetry relative to the baking tray, the left shielding plate moves rightwards relative to the initial position of the left shielding plate to increase the effective air outlet area of the left air outlet, and the right shielding plate moves rightwards relative to the initial position of the right shielding plate to decrease the effective air outlet area of the right air outlet.

When the left and right curtain plates are at the initial positions, the effective air outlet areas of the left and right air outlets are S, the temperature difference of the left and right areas of the food can be various, and T is_{Left side of}-T_{Right side}At > 5 ℃ of:

when T is_{Left side of}-T_{Right side}When the temperature is more than or equal to 20 ℃, the left shield plate moves from the initial position to the left air outlet and is completely shielded, and the effective air outlet area of the right shield plate moves from the initial position to the right air outlet is 2S;

when the temperature is less than or equal to 15 ℃ and T is less than or equal to_{Left side of}-T_{Right side}When the temperature is lower than 20 ℃, the actual air outlet area of the left air outlet opening from the initial position of the left air shield plate to the left is 0.25S, and the actual air outlet area of the right air outlet opening from the initial position of the right air shield plate to the left is 1.75S;

when the temperature is less than or equal to 10 ℃ and T is less than or equal to_{Left side of}-T_{Right side}When the temperature is lower than 15 ℃, the actual air outlet area of the left air outlet opening from the initial position of the left air shield plate to the left is 0.5S, and the actual air outlet area of the right air outlet opening from the initial position of the right air shield plate to the left is 1.5S;

when the temperature is lower than 5 DEG C_{Left side of}-T_{Right side}When the temperature is lower than 10 ℃, the actual air outlet area of the left air outlet opening from the initial position of the left air shield plate to the left is 0.75S, and the actual air outlet area of the right air outlet opening from the initial position of the right air shield plate to the left is 1.25S;

T_{left side of}-T_{Right side}At the temperature of less than or equal to 5 DEG CUnder the following conditions: the left shutter is stationary at its initial position, and the left shutter is also stationary at its initial position.

Further, T_{Right side}-T_{Left side of}At > 5 ℃ of:

when T is_{Right side}-T_{Left side of}When the temperature is more than or equal to 20 ℃, the actual air outlet area of the left shield plate moving from the initial position to the left air outlet in the right direction is 2S, and the right shield plate moving from the initial position to the right air outlet in the right direction is completely shielded;

when the temperature is less than or equal to 15 ℃ and T is less than or equal to_{Right side}-T_{Left side of}When the temperature is lower than 20 ℃, the actual air outlet area of the left air outlet is 1.75S when the left shield plate moves from the initial position to the right air outlet, and the actual air outlet area of the right shield plate moves from the initial position to the right air outlet is 0.25S;

when the temperature is less than or equal to 10 ℃ and T is less than or equal to_{Right side}-T_{Left side of}When the temperature is lower than 15 ℃, the actual air outlet area of the left air outlet is 1.5S when the left shield plate moves from the initial position to the right air outlet, and the actual air outlet area of the right shield plate moves from the initial position to the right air outlet is 0.5S;

when the temperature is lower than 5 DEG C_{Right side}-T_{Left side of}When the temperature is lower than 10 ℃, the actual air outlet area of the left air outlet is 1.25S when the left shield plate moves from the initial position to the right air outlet, and the actual air outlet area of the right shield plate moves from the initial position to the right air outlet is 0.75S;

T_{right side}-T_{Left side of}Under the condition of less than or equal to 5 ℃: the left shutter is stationary at its initial position, and the left shutter is also stationary at its initial position.

Compared with the prior art, the invention has the advantages that: the hot air baffle plate is provided with the left air outlet and the right air outlet respectively, and the left air outlet and the right air outlet are provided with the left shading plate and the right shading plate respectively, so that the actual air outlet areas of the left air outlet and the right air outlet are changed by translating the left shading plate and the right shading plate left and right respectively, the uniformity of the baking tray in a same-layer temperature field is realized, and the baking effect is ensured. According to the same-layer temperature field control method, the uniformity of the temperature field of the left area and the right area of the food is better realized by combining the left temperature difference and the right temperature difference of the same layer with the position of the food, and moving the left shutter and the right shutter.

Drawings

FIG. 1 is a schematic structural view of an oven according to an embodiment of the present invention in a state where a baking tray is not placed;

FIG. 2 is a cross-sectional view of an oven embodying the present invention;

FIG. 3 is a schematic structural view of an oven according to an embodiment of the present invention in a state of placing a baking tray;

FIG. 4 is a schematic view of the structure of FIG. 3 in another direction;

FIG. 5 is a schematic view of the structure of FIG. 3 in still another direction;

FIG. 6 is a logic flow chart illustrating a method for controlling a same-layer temperature field of an oven according to an embodiment of the present invention;

FIG. 7 shows an embodiment of the present invention at T_{Left side of}-T_{Right side}A flow logic diagram of a same-layer temperature field control method of the oven under the condition of more than 5 ℃;

FIG. 8 shows an embodiment of the present invention at T_{Right side}-T_{Left side of}A flow logic diagram of a same-layer temperature field control method of the oven under the condition of more than 5 ℃.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 5, an oven with a uniform homothermal field includes an inner container 1, a hot air baffle 2 is disposed at the rear side of the inner container 1, the hot air baffle 2 and a back plate of the inner container 1 enclose a hot air chamber, an air heater and a back heating pipe surrounding the fan blade of the air heater are disposed in the hot air chamber, and an air inlet 21 opposite to the fan blade of the air heater in the front and back is disposed in the middle of the hot air baffle 2. The air heater and the back heating pipe are both of conventional structures, not shown, except for the back heating pipe, a top heating pipe is installed on the inner top surface of the inner container 1, and a bottom heating pipe is installed at the bottom of the inner container 1.

Further, the hot air baffle 2 is symmetrically provided with a left air outlet 22 and a right air outlet 23 on the left and right sides of the air inlet 21, i.e. the areas of the left and

right air outlets

22, 23 are the same. And a left shielding plate 3 capable of translating left and right relative to the left air outlet 22 is arranged on the left air outlet 22, and a right shielding plate 4 capable of translating left and right relative to the right air outlet 23 is arranged on the right air outlet 23. The actual air outlet areas of the left air outlet 22 and the right air outlet 23 are changed by the left and the right

translation shielding plates

3 and 4, so that the uniformity of the baking tray 9 in a same-layer temperature field is realized, and the baking effect is ensured.

In order to better drive the left and

right shutters

3, 4 to move in the left-right direction, the present invention further comprises a left driving structure 5 and a right driving structure 6 capable of respectively driving the left shutter 3 and the right shutter 4 to move, wherein the left driving structure 5 comprises a left motor 51 and a transversely arranged left telescopic rod 52, one end of the left telescopic rod 52 is fixed with an output shaft of the left motor 51, the other end is fixed with the left shutter 3, the right driving structure 6 comprises a right motor 61 and a transversely arranged right telescopic rod 62, one end of the right telescopic rod 62 is fixed with an output shaft of the right motor 61, the other end is fixed with the right shutter 4, and the left and

right motors

51, 61 are respectively connected with the control board 10 of the oven through electric signals. In this embodiment, the left and

right shutters

3 and 4 are respectively disposed on the back of the hot air baffle 2, the left and

right motors

51 and 61 are respectively disposed on the left and right sides of the inner container 1, and the left and right

extendable rods

52 and 62 respectively penetrate through the left and right sidewalls of the inner container 1 to be connected to the left and

right shutters

3 and 4.

Further, in order to better collect the temperature of the left and right areas of the food, a left temperature sensor 71 is arranged on the left side wall of the inner container 1, a right temperature sensor 72 is arranged on the right side wall of the inner container 1, and each temperature sensor is respectively connected with the control board 10 of the oven through an electric signal. Thus, the temperature of the left and right regions of the food can be detected in real time by the left and

right temperature sensors

71, 72 and fed back to the control board 10, and the control board 10 can drive the corresponding telescopic rods to extend and retract by controlling the corresponding motors so as to enable the corresponding shutters to act. Meanwhile, a camera 8 electrically connected with a control board 10 of the oven is arranged on the inner top surface of the inner container 1. Like this through the placing position signal of camera 8 ability real-time detection food and transmit for control panel 10, and control panel 10 can drive corresponding telescopic link and make the sunshade action that corresponds through the corresponding motor of control.

Therefore, in the invention, the temperature signals of the temperature fields of the left and right regions of the food are respectively collected through the left and

right temperature sensors

71 and 72, meanwhile, the position signals of the food are collected through the camera 8, the collected signals are all transmitted to the control panel 10 by each temperature sensor and the camera 8, the control panel 10 feeds back to each motor, and each motor drives the corresponding telescopic rod to stretch and retract so as to enable the corresponding shielding plate to translate left and right, thereby realizing the control of the actual air outlet area size of the left and

right air outlets

22 and 23 and further realizing the uniformity of the temperature fields of the left and right regions of the food.

Specifically, the detected temperature of the left temperature sensor 71 is denoted by T_{Left side of}The right temperature sensor 72 detects a temperature T_{Right side}The normal fluctuation deviation of the same-layer temperature of the baking tray 9 is a temperature threshold value T_Threshold(s)The initial state of the left shield 3 is to shield half of the left air outlet 22, and the initial state of the right shield 4 is to shield half of the right air outlet 23;

as shown in fig. 6, the oven starts to work, the left and

right temperature sensors

71 and 72 and the camera 8 start to sample respectively, and the collected signals are fed back to the control board 10 respectively,

if | T_{Left side of}-T_{Right side}∣≤T_Threshold(s)The left and

right shielding plates

3 and 4 are not moved;

if T_{Left side of}-T_{Right side}＞T_Threshold(s)When food is placed to the left relative to the baking tray 9, the left shielding plate 3 moves to the left from the initial position, the effective air outlet area of the left air outlet 22 is reduced, and meanwhile, the right shielding plate 4 moves to the right from the initial position until the right air outlet 23 is completely shielded; when the food is placed to the right relative to the baking tray 9, the left shielding plate 3 moves to the left from the initial position to completely shield the left air outlet 22, and meanwhile, the right shielding plate 4 moves to the left from the initial position to increase the effective air outlet area of the right air outlet 23; when the food is placed symmetrically left and right relative to the grill plate 9, the left shutter 3 moves left relative to its initial position to reduce the effective air outlet area of the left air outlet 22, and the right shutter 4 moves left relative to its initial position to increase the effective air outlet area of the right air outlet 23;

if T_{Right side}-T_{Left side of}＞T_Threshold(s)When food is placed to the left relative to the baking tray 9, the left shielding plate 3 moves rightwards from the initial position, the effective air outlet area of the left air outlet 22 is increased, and meanwhile, the right shielding plate 4 moves rightwards from the initial position until the right air outlet 23 is completely shielded; when the food is placed to the right relative to the baking tray 9, the left shielding plate 3 moves to the left from the initial position to completely shield the left air outlet 22,meanwhile, the right shielding plate 4 moves rightwards from the initial position thereof, so that the effective air outlet area of the right air outlet 23 is reduced; when the food is placed in bilateral symmetry with respect to the grill plate 9, the left louver 3 moves rightward with respect to the initial position thereof to increase the effective air outlet area of the left air outlet 22, and the right louver 4 moves rightward with respect to the initial position thereof to decrease the effective air outlet area of the right air outlet 23.

Further, as shown in fig. 7, when the left and

right shutters

3 and 4 are at the initial positions, the effective air outlet areas of the left and

right air outlets

22 and 23 are both S, the temperature difference between the left and right areas of the food may be varied, T_{Left side of}-T_{Right side}At > 5 ℃ of:

when T is_{Left side of}-T_{Right side}When the temperature is more than or equal to 20 ℃, the left shielding plate 3 moves from the initial position to the left air outlet 22 and is completely shielded, and the effective air outlet area of the right shielding plate 4 moves from the initial position to the right air outlet 23 is 2S;

when the temperature is less than or equal to 15 ℃ and T is less than or equal to_{Left side of}-T_{Right side}When the temperature is lower than 20 ℃, the actual air outlet area of the left air outlet 22 from the initial position of the left air shield 3 to the left is 0.25S, and the actual air outlet area of the right air outlet 23 from the initial position of the right air shield 4 to the left is 1.75S;

when the temperature is less than or equal to 10 ℃ and T is less than or equal to_{Left side of}-T_{Right side}When the temperature is lower than 15 ℃, the actual air outlet area of the left air outlet 22 from the initial position of the left air shield 3 to the left is 0.5S, and the actual air outlet area of the right air outlet 23 from the initial position of the right air shield 4 to the left is 1.5S;

when the temperature is lower than 5 DEG C_{Left side of}-T_{Right side}When the temperature is lower than 10 ℃, the actual air outlet area of the left air outlet 22 from the initial position of the left air shield 3 to the left is 0.75S, and the actual air outlet area of the right air outlet 23 from the initial position of the right air shield 4 to the left is 1.25S;

T_{left side of}-T_{Right side}Under the condition of less than or equal to 5 ℃: the left shutter 3 is stationary at its initial position, and the left shutter 3 is also stationary at its initial position.

Further, as shown in FIG. 8, T_{Right side}-T_{Left side of}At > 5 ℃ of:

when T is_{Right side}-T_{Left side of}When the temperature is more than or equal to 20 ℃, the left shielding plate 3 moves rightwards from the initial position toThe actual air outlet area of the left air outlet 22 is 2S, and the right shielding plate 4 is moved from its initial position to the right to be completely shielded by the right air outlet 23;

when the temperature is less than or equal to 15 ℃ and T is less than or equal to_{Right side}-T_{Left side of}When the temperature is lower than 20 ℃, the actual air outlet area of the left air outlet 22 is 1.75S when the left shield plate 3 moves rightwards from the initial position, and the actual air outlet area of the right air outlet 23 when the right shield plate 4 moves rightwards from the initial position is 0.25S;

when the temperature is less than or equal to 10 ℃ and T is less than or equal to_{Right side}-T_{Left side of}When the temperature is lower than 15 ℃, the actual air outlet area of the left air outlet 22 is 1.5S when the left shield plate 3 moves rightwards from the initial position, and the actual air outlet area of the right air outlet 23 when the right shield plate 4 moves rightwards from the initial position is 0.5S;

when the temperature is lower than 5 DEG C_{Right side}-T_{Left side of}When the temperature is lower than 10 ℃, the actual air outlet area of the left air outlet 22 is 1.25S when the left shield plate 3 moves rightwards from the initial position, and the actual air outlet area of the right air outlet 23 when the right shield plate 4 moves rightwards from the initial position is 0.75S;

T_{right side}-T_{Left side of}Under the condition of less than or equal to 5 ℃: the left shutter 3 is stationary at its initial position, and the left shutter 3 is also stationary at its initial position.

Claims

1. The utility model provides an even oven in same floor temperature field, includes inner bag (1), and the rear side of this inner bag (1) is provided with hot-blast baffle (2), and this hot-blast baffle (2) encloses into hot-blast room with the backplate of inner bag (1), is provided with the air heater in this hot-blast room and encloses the back heating pipe of establishing in this air heater's flabellum periphery, and the middle part of above-mentioned hot-blast baffle (2) is provided with relative air intake (21) around with the flabellum of above-mentioned air heater, its characterized in that, be provided with left air outlet (22) and right air outlet (23) respectively in the left and right sides of above-mentioned air intake (21) on hot-blast baffle (2), and be provided with on this left air outlet (22) and control the translation left and right sides sunshade (3) for this left air outlet (22), be provided with on right air outlet (23) and control panel (10) the left and right translation's of camera with the oven on the interior top surface of inner bag (1), camera signal connection of camera is provided with the control panel (10) of oven (8) A left temperature sensor (71) is arranged on the left side wall of the inner container (1), a right temperature sensor (72) is arranged on the right side wall of the inner container (1), each temperature sensor is respectively connected with a control panel (10) of the oven through an electric signal,

recording the detection temperature of the left temperature sensor (71) as Tleft, the detection temperature of the right temperature sensor (72) as Tright, the normal fluctuation deviation of the temperature of the same layer of the baking tray (9) as a temperature threshold value T threshold, the initial state of the left shielding plate (3) is to cover half of the left air outlet (22), and the initial state of the right shielding plate (4) is to cover half of the right air outlet (23);

the oven starts to work, the left and right temperature sensors (71, 72) and the camera (8) respectively start to sample, and respectively feed back the collected signals to the control board (10),

if | -T left-T right | ≦ T threshold, the left and right shielding plates (3, 4) do not move;

if Tleft-Tright is larger than T threshold, when food is placed to the left relative to the baking tray (9), the left shielding plate (3) moves to the left from the initial position, the effective air outlet area of the left air outlet (22) is reduced, and meanwhile, the right shielding plate (4) moves to the right from the initial position until the right air outlet (23) is completely shielded; when food is placed to the right relative to the baking tray (9), the left shielding plate (3) moves leftwards from the initial position to the left air outlet (22) and is completely shielded, and meanwhile, the right shielding plate (4) moves leftwards from the initial position to increase the effective air outlet area of the right air outlet (23); when the food is placed in bilateral symmetry relative to the baking tray (9), the left shielding plate (3) moves leftwards relative to the initial position to reduce the effective air outlet area of the left air outlet (22), and the right shielding plate (4) moves leftwards relative to the initial position to increase the effective air outlet area of the right air outlet (23);

if Tright-Tleft is larger than T threshold, when food is placed to the left relative to the baking tray (9), the left shielding plate (3) moves rightwards from the initial position, the effective air outlet area of the left air outlet (22) is increased, and meanwhile, the right shielding plate (4) moves rightwards from the initial position until the right air outlet (23) is completely shielded; when food is placed to the right relative to the baking tray (9), the left shielding plate (3) moves leftwards from the initial position to the left air outlet (22) and is completely shielded, and meanwhile, the right shielding plate (4) moves rightwards from the initial position to reduce the effective air outlet area of the right air outlet (23); when the food is placed in bilateral symmetry relative to the baking tray (9), the left shielding plate (3) moves rightwards relative to the initial position to increase the effective air outlet area of the left air outlet (22), and the right shielding plate (4) moves rightwards relative to the initial position to decrease the effective air outlet area of the right air outlet (23).

2. The oven according to claim 1, further comprising a left driving structure (5) and a right driving structure (6) for driving the left shutter (3) and the right shutter (4) to move, respectively, wherein the left driving structure (5) comprises a left motor (51) and a laterally disposed left telescopic rod (52), one end of the left telescopic rod (52) is fixed to an output shaft of the left motor (51), the other end is fixed to the left shutter (3), the right driving structure (6) comprises a right motor (61) and a laterally disposed right telescopic rod (62), one end of the right telescopic rod (62) is fixed to an output shaft of the right motor (61), the other end is fixed to the right shutter (4), and the left and right motors (51, 61) are electrically connected to a control board (10) of the oven, respectively.

3. The oven according to claim 2, characterized in that the left and right shutters (3, 4) are respectively provided at the back of the hot air baffle (2), the left and right motors (51, 61) are respectively provided at the left and right sides of the inner container (1), and the left and right extendable rods (52, 62) are respectively connected to the left and right shutters (3, 4) through the left and right sidewalls of the inner container (1).

4. The oven according to claim 1, characterized in that the effective air outlet areas of the left and right air outlets (22, 23) are S when the left and right shutters (3, 4) are in the initial position,

T_{left side of}-T_{Right side}At > 5 ℃ of:

when T is_{Left side of}-T_{Right side}When the temperature is more than or equal to 20 ℃, the left shielding plate (3) moves from the initial position to the left air outlet (22) and is completely shielded, and the effective air outlet area of the right shielding plate (4) moves from the initial position to the right air outlet (23) is 2S;

when the temperature is less than or equal to 15 ℃ and T is less than or equal to_{Left side of}-T_{Right side}When the temperature is lower than 20 ℃, the actual air outlet area of the left shield plate (3) moving leftwards from the initial position to the left air outlet (22) is 0.25S, and the actual air outlet area of the right shield plate (4) moving leftwards from the initial position to the right air outlet (23) is1.75S；

When the temperature is less than or equal to 10 ℃ and T is less than or equal to_{Left side of}-T_{Right side}When the temperature is lower than 15 ℃, the actual air outlet area of the left shielding plate (3) moving leftwards from the initial position to the left air outlet (22) is 0.5S, and the actual air outlet area of the right shielding plate (4) moving leftwards from the initial position to the right air outlet (23) is 1.5S;

when the temperature is lower than 5 DEG C_{Left side of}-T_{Right side}When the temperature is lower than 10 ℃, the actual air outlet area of the left shielding plate (3) moving leftwards from the initial position to the left air outlet (22) is 0.75S, and the actual air outlet area of the right shielding plate (4) moving leftwards from the initial position to the right air outlet (23) is 1.25S;

T_{left side of}-T_{Right side}Under the condition of less than or equal to 5 ℃: the left shutter (3) is stationary at its initial position, and the right shutter (4) is also stationary at its initial position.

5. The oven of claim 1,

when the left and right shielding plates (3, 4) are at the initial positions, the effective air outlet areas of the left and right air outlets (22, 23) are S,

T_{right side}-T_{Left side of}At > 5 ℃ of:

when T is_{Right side}-T_{Left side of}When the temperature is more than or equal to 20 ℃, the actual air outlet area of the left shielding plate (3) moving from the initial position to the left air outlet (22) is 2S, and the right shielding plate (4) moving from the initial position to the right air outlet (23) is completely shielded;

when the temperature is less than or equal to 15 ℃ and T is less than or equal to_{Right side}-T_{Left side of}When the temperature is lower than 20 ℃, the actual air outlet area of the left air outlet (22) is 1.75S when the left air shield (3) moves rightwards from the initial position, and the actual air outlet area of the right air outlet (23) when the right air shield (4) moves rightwards from the initial position is 0.25S;

when the temperature is less than or equal to 10 ℃ and T is less than or equal to_{Right side}-T_{Left side of}When the temperature is lower than 15 ℃, the actual air outlet area of the left air outlet (22) is 1.5S when the left air shield (3) moves rightwards from the initial position, and the actual air outlet area of the right air outlet (23) when the right air shield (4) moves rightwards from the initial position is 0.5S;

when the temperature is lower than 5 DEG C_{Right side}-T_{Left side of}When the temperature is less than 10 ℃, the left shielding plate (3) moves rightwards from the initial position to reach the actual position of the left air outlet (22)The air outlet area is 1.25S, and the actual air outlet area of the right shield plate (4) which moves from the initial position to the right air outlet (23) is 0.75S;

T_{right side}-T_{Left side of}Under the condition of less than or equal to 5 ℃: the left shutter (3) is stationary at its initial position, and the right shutter (4) is also stationary at its initial position.