CN210784029U - Temperature control device of electric oven - Google Patents

Abstract

The utility model discloses a temperature control device of an electric oven, which comprises an oven body, a door component, an upper electric heating device and a lower electric heating device; the upper electric heating device comprises an upper heating tube, the lower electric heating device comprises a lower heating tube, and the number of the heating tubes is more than or equal to 2; the upper portion in the box is equipped with first temperature controller and second temperature controller, first temperature controller control upper portion heating tube and lower part heating tube, the second temperature controller control upper portion front end heating tube and lower part front end heating tube. The utility model discloses a heating tube in second temperature controller single control oven heating chamber outside realizes coloring uneven compensation heating to outside food through the time of generating heat of control outside heating tube to this colourity that realizes outside food to color approaches heating chamber center and inboard colourity.

Description

An electric oven temperature control device

technical field

The utility model belongs to the technical field of electric ovens, in particular to a temperature control device and method for an electric oven.

Background technique

At present, the common electric oven temperature control methods or devices in the market mainly include two types: mechanical type and electronic type. Among them, the mechanical type mainly uses the built-in bimetal mechanical thermostat to realize the relative control of the oven heating chamber temperature, while the electronic oven is characterized by the use of NTC (negative temperature coefficient thermistor) thermostat to realize the relative control of the oven heating chamber temperature. Control of heating chamber temperature. The above two thermostats control the temperature of the heating chamber, mainly taking the central position of the heating chamber as a reference point to realize the reference judgment of the temperature control value. Patent CN202858874U discloses an upper and lower independent temperature control method. This method realizes the difference in baking the coloring effect of food in the upper and lower areas (mainly achieved by separately controlling the heating time of the upper and lower heating tubes), but the temperature control category is still based on the center of the heating cavity. The reference point is used as a temperature measurement value, and the thermostat mainly controls the heating time and on-off of the upper and lower heating tubes. But at present, there is still a problem that has been plaguing the design and manufacture of the oven. On the side of the oven (also called the outer side), the coloring of the food is lighter than the coloring of the center and rear of the heating chamber. The reason for this problem is that on the side of the door, because the main body of the door is glass (convenient for consumers to observe the baking state of the food inside), the heat transmission performance of the glass is large, which causes the heat to be dissipated from the glass side to the environment; In addition, due to the poor airtightness on the side of the door (there is a gap between the door and the heating cavity, especially for ovens without a sealing ring), heat is dissipated into the environment through the gap; due to the above factors, the oven heating cavity The temperature on the side of the door is relatively low, and the heat reflectivity is low (the heat reflectivity of metal is higher than that of ordinary glass), which leads to the light color of the food on the side of the door, which affects the baked food. product consistency.

Utility model content

In view of the technical problems existing in the above-mentioned prior art, the purpose of this utility model is to propose a technical improvement scheme, by adding a temperature controller to the outside of the oven heating cavity to detect the relative temperature of the outside, to obtain a reference for temperature judgment At the same time, the thermostat on the outside controls the heating tubes on the outside of the oven heating chamber (upper tube and lower tube on the outside), and by controlling the heating time of the outer heating tube, it can compensate for the uneven coloring of the food on the outside. Thereby, the chromaticity of the coloring of the outer food is close to the chromaticity of the center and the inner side of the heating chamber.

In order to achieve the above object, the technical scheme that the utility model provides is as follows:

A temperature control device for an electric oven, the electric oven comprises a box body and a door assembly, the door assembly is arranged on the front side of the box body, the lower end of the door assembly is rotatably connected with the box body, and the box body is provided with a heating cavity , the upper part of the heating cavity is provided with an upper electric heating device, the lower part of the heating cavity is provided with a lower electric heating device, the upper electric heating device includes an upper heating tube, and the lower electric heating device includes a lower heating tube,

The numbers of the upper heating pipes and the lower heating pipes are both greater than or equal to 2; Outside the cavity, a group of heating pipes in the upper heating pipe closest to the door assembly is the upper front-end heating pipe, and a group of heating pipes in the lower heating pipe closest to the door assembly is the lower front-end heating pipe; the upper part of the box is provided with a first heating pipe. A thermostat and a second thermostat: the first thermostat controls the temperature inside the heating chamber by controlling the working states of the upper and lower heating pipes; the second thermostat controls the temperature of the upper The working state of the front-end heating pipe and the lower front-end heating pipe realizes the temperature control of the area near the door assembly outside the heating chamber.

The door assembly includes a door frame, an inner glass, an outer glass and a door handle; when the electric oven is working, the door assembly is opened to put in food, and then the door assembly is closed to bake the food.

Preferably, the first temperature controller is arranged in the upper middle position of the box, and the second temperature controller is arranged in the upper outer side of the box near the door assembly.

Preferably, the first thermostat and the second thermostat are arranged at the same height.

Preferably, the first temperature controller and the second temperature controller are negative temperature coefficient thermistor temperature controllers. The first thermostat includes a first thermostat temperature sensor, and the second thermostat includes a second thermostat temperature sensor.

Preferably, the second thermostat controls only the upper front-end heating pipe or only the lower front-end heating pipe or simultaneously controls the working states of the upper front-end heating pipe and the lower front-end heating pipe.

Preferably, the first temperature controller only controls the upper heating pipe or only the lower heating pipe or controls the working states of the upper heating pipe and the lower heating pipe at the same time.

Preferably, the number of the upper heating pipe and the lower heating pipe is between 2 and 4 respectively.

More preferably, the number of the upper heating pipe and the lower heating pipe is 2 each.

Preferably, the upper heating pipe and the lower heating pipe are one or more combinations of straight pipes, M-shaped pipes and U-shaped pipes.

Preferably, the upper heating tube and the lower heating tube are stainless steel heating tubes, quartz heating tubes, halogen tubes or carbon fiber heating tubes.

The working principle of the present utility model is as follows:

In practical applications, when starting to bake food, the upper heating tube and the lower heating tube generate heat with full power to heat and bake the food. When the heating chamber reaches the set temperature, the first thermostat will feed back the signal after receiving the signal. The relay, the relay is disconnected, and all the upper and lower heating tubes stop heating; at this stage, the second thermostat retrieves the temperature in the front-end area and feeds back a signal to the IC on the control board, and conducts heating on the upper and lower front-end heating tubes. The heating is controlled separately to compensate for the heat energy lost on the side of the door assembly due to heat radiation and heat conduction. Compensation heating is performed. After heating to the set reference temperature, the upper and lower front-end heating pipes stop heating; then the temperature begins to drop. (because of food heat absorption and heat loss), after the temperature drops to the built-in set error value, the first thermostat receives the signal and feeds it back to the relay, the relay closes, the upper heating tube and the lower heating tube continue to heat; This is a cycle, and it runs according to the above control logic over and over again. After the set working time arrives, the machine stops running and the food is taken out.

Compared with the prior art, the beneficial effects of the present utility model:

The electric oven thermostat of the prior art mainly controls the overall heating on-off time of the upper and lower heating tubes, and can also control the heating time of the upper heating tube alone or the lower heating tube, but the control reference value of its temperature is Reference value for the virtual center inside the heating chamber. The utility model detects the relative temperature of the outside by adding a temperature controller to the outside of the oven heating cavity to obtain a reference value for temperature judgment. At the same time, the outside temperature controller independently controls the heating tube outside the oven heating cavity. (outer upper tube, lower tube); by controlling the heating time of the outer heating tube, the compensation heating for the uneven coloring of the outer food is realized, so that the color of the outer food can be approximated to the coloring of the center and the inner side of the heating chamber. Spend.

Description of drawings

Figure 1 is a schematic diagram of the internal structure of the present invention.

FIG. 2 is a schematic diagram of the present invention applied to baking cookies.

Figure 3 is a schematic diagram of food placement.

Included in Figures 1 and 2 are:

1 - box

2——The upper front end heating pipe

3 - The first thermostat temperature sensor

4 - The second thermostat temperature sensor

5 - heating chamber

6——The lower front end heating pipe

7 - door assembly

8 - Cookies

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model is further described in detail below with reference to the specific embodiments and the accompanying drawings, but the protection scope required by the present utility model is not limited to the embodiments.

Example 1:

A temperature control device for an electric oven, the electric oven includes a box body 1 and a door assembly 7, the door assembly 7 is arranged on the front side of the box body 1, and the lower end of the door assembly 7 is rotatably connected with the box body 1, and the box There is a heating cavity 5 in the body, the upper part of the heating cavity 5 is provided with an upper electric heating device, the lower part of the heating cavity 5 is provided with a lower electric heating device, the upper electric heating device includes an upper heating pipe, and the lower electric heating device The device includes a lower heating pipe;

The upper heating pipe and the lower heating pipe are two straight heating pipes, and the two straight heating pipes are sequentially arranged from the inside of the heating chamber 5 away from the door assembly to the one close to the door assembly in a direction parallel to the lower end of the door assembly. Outside the heating chamber 5, the heating pipe closest to the door assembly among the upper heating pipe and the lower heating pipe is the front heating pipe; the upper part of the box is provided with a first temperature controller and a second temperature controller: the first temperature controller A thermostat controls the temperature inside the heating chamber 5 by controlling the working states of the upper heating pipe and the lower heating pipe; the second thermostat controls the working conditions of the upper front heating pipe 2 and the lower front heating pipe 6 , to achieve temperature control of the area outside the heating chamber 5 close to the door assembly 7 .

The first temperature controller is arranged in the upper middle position of the box, the second temperature controller is arranged in the upper outer side of the box near the door assembly, and the first temperature controller and the second temperature controller are arranged in the same high.

The first temperature controller and the second temperature controller are negative temperature coefficient thermistor temperature controllers. The first thermostat includes a first thermostat temperature sensor 3 , and the second thermostat includes a second thermostat temperature sensor 4 .

The second thermostat only controls the upper front-end heating pipe 2 or only the lower front-end heating pipe 6 or controls the working state of the upper front-end heating pipe 2 and the lower front-end heating pipe 6 simultaneously.

The first thermostat controls only the upper heating pipe or only the lower heating pipe or controls the working states of the upper heating pipe and the lower heating pipe simultaneously.

The upper heating tube and the lower heating tube may also be M-shaped tubes or U-shaped tubes.

The upper heating tube and the lower heating tube are stainless steel heating tubes, quartz heating tubes, halogen tubes or carbon fiber heating tubes.

Using the utility model to make a plate of cookies, the steps are as follows:

1. Spread the cookies evenly on the baking tray;

2. Set the baking temperature and time of the cookies, such as: set the upper and lower fire to 180 degrees for 20 minutes;

3. Start the oven, and let the oven empty to preheat first. After reaching the required temperature, open the oven door, then put the cookies (as shown in Figure 3), and start the official baking;

4. The oven bakes the cookies, and the upper heating tube and the lower heating tube generate full power to heat and bake the food. When the heating chamber reaches the temperature, after the first thermostat receives the signal, it feeds back to the relay, and the relay turns off. When it starts to work, all the upper and lower heating tubes stop heating; at this stage, the second thermostat retrieves the temperature in the front-end area and feeds back a signal to the IC on the control board to control the upper and lower front-end heating tubes individually. Heating to compensate the heat energy lost on the side of the door assembly due to thermal radiation and heat conduction, and perform compensating heating. After heating to the set reference temperature, the front heating pipes at the upper and lower parts stop heating; then the temperature begins to drop (because Food heat absorption and heat loss), after the temperature drops to the built-in set error value, the first thermostat receives the signal and feeds it back to the relay, the relay is closed, and the heating tube continues to heat; this is a cycle, and the cycle starts again and again is operated according to the above control logic;

5. After the set working time arrives, the machine will stop running, take out the cookies, and the coloring of the whole plate of cookies will be uniform.

Example 2:

Compared with Embodiment 1, the upper heating pipe is two M-shaped heating pipes, the lower heating pipe is two U-shaped heating pipes, and other structures are the same as those of Embodiment 1.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in the present utility model, these terms are only for the convenience of description and do not constitute any limitation to the present utility model.

Claims (10)

1. A temperature control device of an electric oven comprises a box body and a door assembly, wherein the door assembly is arranged at the front side of the box body, the lower end of the door assembly is rotatably connected with the box body, a heating cavity is arranged in the box body, an upper electric heating device is arranged at the upper part in the heating cavity, a lower electric heating device is arranged at the lower part in the heating cavity, the upper electric heating device comprises an upper heating tube, the lower electric heating device comprises a lower heating tube, and the temperature control device is characterized in that,

the number of the upper heating tubes and the number of the lower heating tubes are both more than or equal to 2; the upper heating tubes and the lower heating tubes are sequentially arranged from the inner side of the heating cavity far away from the door assembly to the outer side of the heating cavity close to the door assembly in a direction parallel to the lower end of the door assembly, one group of heating tubes closest to the door assembly in the upper heating tubes are upper front-end heating tubes, and one group of heating tubes closest to the door assembly in the lower heating tubes are lower front-end heating tubes; the upper portion in the box is equipped with first temperature controller and second temperature controller: the first temperature controller controls the temperature inside the heating cavity by controlling the working states of the upper heating tube and the lower heating tube; the second temperature controller controls the temperature of the heating cavity outside near the door assembly area by controlling the working states of the upper front end heating tube and the lower front end heating tube.

2. The temperature control apparatus of an electric oven according to claim 1, wherein the first temperature controller is disposed at an upper middle position in the box body, and the second temperature controller is disposed at an upper outer side in the box body near the door assembly.

3. The temperature control apparatus of an electric oven according to claim 2, wherein the first temperature controller and the second temperature controller are disposed at the same height.

4. The temperature control apparatus of an electric oven according to claim 1, wherein the first and second temperature controllers are ntc temperature controllers.

5. The temperature control apparatus of an electric oven according to claim 1, wherein the second temperature controller controls only the upper front heat pipe or only the lower front heat pipe or controls both the upper front heat pipe and the lower front heat pipe.

6. The temperature control apparatus of an electric oven according to claim 1, wherein the first temperature controller controls only the upper heating tube or only the lower heating tube or controls both the upper heating tube and the lower heating tube.

7. The temperature control apparatus of the electric oven according to claim 1, wherein the number of the upper heating tubes and the lower heating tubes is 2-4.

8. The temperature control apparatus of an electric oven according to claim 7, wherein the number of the upper heating tubes and the lower heating tubes is 2 each.

9. The temperature control device of the electric oven according to claim 1, wherein the upper heating tube and the lower heating tube are one of a straight tube, an M-shaped tube and a U-shaped tube or 2-4 mixed matching.

10. The temperature control apparatus of the electric oven according to claim 1, wherein the upper and lower heating tubes are stainless steel heating tubes, quartz heating tubes, halogen tubes or carbon fiber heating tubes.

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