CN216702341U - Temperature-changing oven - Google Patents

Abstract

The utility model relates to the technical field of ovens, and discloses a variable temperature oven. The variable temperature oven includes a box and a heating assembly, and the heating assembly includes a metal heating tube and an instantaneous heat tube: the instantaneous heat tube includes a hollow tube made of high temperature resistant material, and a heating core arranged in the hollow tube. The electric-heat conversion efficiency of the heating core is greater than that of the metal heating tube. Electric-heat conversion efficiency; the metal heating tube controls whether it is energized for heating through the first switch, and the instantaneous heat pipe controls whether it is energized and heated through the second switch. The variable temperature oven provided by the utility model can improve the heating speed of the oven, so that the oven can meet various functional requirements such as baking and roasting.

Description

a variable temperature oven

technical field

The utility model relates to the technical field of ovens, in particular to a variable temperature oven.

Background technique

The heating device in a traditional oven is generally a metal heating tube. The heating speed of the metal heating tube is slow, and the oven takes about ten minutes to preheat each time it is turned on, and it takes seven minutes to reach 120°C at the fastest. It can be seen that the traditional oven has a slow heating speed and a long preheating time, resulting in a long cooking time.

Moreover, in traditional ovens, when cooking food through a metal heating tube, the infrared heating coefficient is low, which leads to poor water-locking ability and uneven heating of the food. Therefore, baking pastries is OK, but roasting meat food cannot effectively lock the moisture of the food. To achieve the best effect of crispy outside and tender inside. Therefore, traditional ovens are generally not suitable for roasting meat.

Therefore, how to increase the heating rate of the oven and how to make the oven meet various functional requirements such as baking and roasting are technical problems to be solved urgently by those skilled in the art.

Utility model content

In view of this, the purpose of the present invention is to provide a variable temperature oven, which can increase the heating rate of the oven, so that the oven can meet various functional requirements such as baking and roasting.

To achieve the above object, the utility model provides the following technical solutions:

A variable temperature oven, comprising a box body and a heating assembly, wherein the heating assembly includes a metal heating pipe and an instantaneous heat pipe, wherein:

The instant heat pipe comprises a hollow tube made of high temperature resistant material, and a heating core arranged in the hollow tube, and the electrothermal conversion efficiency of the heating core is greater than that of the metal heating tube;

The metal heating tube is controlled by the first switch whether it is energized for heating, and the instant heat pipe is controlled by the second switch whether it is energized for heating.

Optionally, in the above variable temperature oven, both the first switch and the second switch are manual switches.

Optionally, in the above-mentioned variable temperature oven, a controller is further provided in the variable temperature oven, the first switch and the second switch are respectively connected to the controller in signal, and the controller can control the controller. The metal heating pipe and the instant heat pipe are electrically heated at the same time, and the metal heating pipe and the instant heat pipe can be controlled to be electrically heated separately.

Optionally, in the above-mentioned variable temperature oven, the heating assembly further includes a fixing member and a support frame, wherein:

The metal heating tube includes a heating tube body, and a first connection end and a second connection end for connecting the heating circuit, and the first connection end and the second connection end are both fixedly installed on the Inside the box, the heating pipe body forms an annular heating zone;

The instantaneous heat pipe is fixedly installed in the annular heating zone through the support frame.

Optionally, in the above-mentioned variable temperature oven, the support frame includes a first support frame and a second support frame, and the heating pipe body includes a first heating section, a second heating section, a third heating section, a Four heating sections and fifth heating section, of which:

The first heating section and the third heating section are parallel, and are respectively connected with the first support frame;

The fifth heating section and the third heating section are parallel, and are respectively connected with the second support frame;

The instant heat pipe is fixedly installed in the annular heating area through the first support frame and the second support frame.

Optionally, in the above-mentioned variable temperature oven, the main body of the first support frame is provided with a first lead groove for accommodating the lead wire of the instant heat pipe;

The main body of the second support frame is provided with a second lead slot for accommodating the lead wire of the instant heat pipe.

Optionally, in the above-mentioned variable temperature oven, the heating core is a graphene coating provided on the inner wall of the hollow tube for conductive heating.

Optionally, in the above-mentioned variable temperature oven, both ends of the hollow tube are respectively provided with end assemblies, and the end assemblies include an insulating plug, and a tab electrically connected to the graphene coating, and the end assembly. the leads connected to the tabs, where:

the tabs are fixedly arranged in the hollow tube;

The insulating plug is used to close the end orifice of the hollow pipe;

The insulating plug is provided with an internal channel, one end of the lead wire is connected to the tab, and the other end extends out of the hollow tube through the internal channel;

The hollow tube forms a sealed space through the insulating plugs installed at the pipe openings at both ends, and the sealed space is filled with an inert gas.

Optionally, in the above-mentioned variable temperature oven, the heating core is a carbon fiber heating wire disposed in the hollow tube and arranged coaxially with the hollow tube.

Optionally, in the above-mentioned variable temperature oven, both ends of the hollow tube are respectively provided with end assemblies, and the end assemblies include insulating plugs and lead wires electrically connected to the carbon fiber heating wire, wherein:

The insulating plug is used to close the end orifice of the hollow pipe;

The insulating plug is provided with an internal channel, one end of the lead wire is connected with the carbon fiber heating wire, and the other end extends out of the hollow tube through the internal channel;

The hollow tube forms a sealed space through the insulating plugs installed at the pipe openings at both ends, and the sealed space is filled with an inert gas.

It can be seen from the above technical solutions that in the temperature-variable oven provided by the present invention, due to the high electrothermal conversion efficiency of the instantaneous heat pipe, the instantaneous heat at startup can be realized without preheating. Moreover, the instant heat pipe can make the heating process of the oven have the powerful advantages of rapid heating and uniform heating, thereby enhancing the baking effect of the crispy skin of the food. It can improve the working efficiency of the oven and shorten the working time of the oven.

In addition, during the use of the variable temperature oven, due to the use of metal heating tubes and instantaneous heat tubes with different electro-thermal conversion efficiencies, and their opening and closing are controlled by different switches, the instantaneous heat technology is combined with traditional metal heating technology. A variety of different heating modes can be realized, and the working states of the metal heating tube and the instantaneous heat tube can be adjusted according to actual needs (the two are heated at the same time, or the metal heating tube is heated separately, or the instantaneous heat tube is heated separately), so that during use, it can be Suitable baking modes are matched according to different ingredients, and different baking modes correspond to suitable heating methods, so that the baking effect of various foods can be improved, and the oven can meet the baking requirements of full coverage of various ingredients.

In particular, it should be noted that since the variable temperature oven has the advantages of no preheating and fast heating speed during use, the variable temperature oven can be suitable for roasting meat, so that the meat ingredients can achieve a roasting effect that is crispy on the outside and tender on the inside. Moreover, for food that is suitable for instantaneous heat on the surface, the heating time can be shortened and the taste of the food can be improved; for food that requires high temperature uniformity inside and outside, the preheating time can be shortened.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the internal structure diagram of the oven provided by the first specific embodiment of the present utility model;

2 is a schematic structural diagram of a heating assembly provided by the first specific embodiment of the present invention;

3 is a schematic structural diagram of a metal heating tube provided by the first specific embodiment of the present utility model;

4 is a schematic structural diagram of a graphene heating tube provided by the first specific embodiment of the present invention;

5 is a schematic structural diagram of a fixing frame provided by the first specific embodiment of the present invention;

6 is a partial enlarged view of the fixing frame provided by the first specific embodiment of the present utility model;

7 is a schematic diagram of an exploded structure of an end portion of a graphene heating tube provided by the first specific embodiment of the present invention;

8 is a cross-sectional view of an end portion of a graphene heating tube provided by the first specific embodiment of the present invention;

9 is a flow chart of a temperature-variable control method provided by the first specific embodiment of the present invention;

10 is a schematic diagram of the overall structure of the carbon fiber heating wire provided by the second specific embodiment of the present invention;

FIG. 11 is an end sectional view of the carbon fiber heating wire provided by the second specific embodiment of the present invention.

in:

1- Heating assembly, 2- Slide rail, 3- Baking pan, 4- Grill, 5- Fan outlet,

6-Instantaneous heat pipe, 7-Metal heating pipe, 8-Fixing frame, 9-Fixing piece, 10-Installation hole,

11-insulation plug, 12-hollow tube, 13-copper ring tab, 14-lead wire,

15- Graphene conductive heating coating, 16- inert gas, 17- wire slot;

18-Carbon fiber heating wire.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

First specific embodiment

Referring to FIGS. 1 to 9 , the variable temperature oven provided by the first specific embodiment of the present invention includes a box body, a heating assembly and a controller. The heating assembly includes a metal heating pipe 7 and an instantaneous heat pipe 6 . Wherein: the metal heating tube 7 is controlled by the first switch to be energized for heating, and the instant heat pipe 6 is controlled by the second switch to be energized for heating; the instant heat pipe 6 includes a hollow tube 12 made of high temperature resistant material, and a heating core arranged in the hollow tube 12, The electrothermal conversion efficiency of the heating core is greater than that of the metal heating tube 7 .

In the temperature-variable oven, since the electric-to-heat conversion efficiency of the instantaneous heat pipe 6 is relatively high, it is possible to realize the instantaneous heat at startup without preheating. Moreover, the instant heat pipe 6 can make the heating process of the oven have the powerful advantages of rapid heating and uniform heating, so as to achieve the baking effect of enhancing the crispness of the food skin. It can improve the working efficiency of the oven and shorten the working time of the oven.

In addition, in the process of using the variable temperature oven, since the metal heating tube 7 and the instantaneous heat tube 6 with different electro-thermal conversion efficiencies are used, and their opening and closing are controlled by different switches, the instantaneous heating technology is compared with the traditional metal heating technology. Combined, a variety of different heating modes can be realized, and the working states of the metal heating pipe 7 and the instantaneous heat pipe 6 can be adjusted according to actual needs (both are heated at the same time, or the metal heating pipe 7 is heated alone, or the instantaneous heat pipe 6 is heated alone), so that In the process of use, suitable baking modes can be matched according to different ingredients, and different baking modes correspond to suitable heating methods, so that the baking effect of various foods can be improved, and the oven can meet the baking requirements of full coverage of various ingredients.

In particular, it should be noted that since the variable temperature oven has the advantages of no preheating and fast heating speed during use, the variable temperature oven can be suitable for roasting meat, so that the meat ingredients can achieve a roasting effect that is crispy on the outside and tender on the inside. Moreover, for food that is suitable for instantaneous heat on the surface, the heating time can be shortened and the taste of the food can be improved; for food that requires high temperature uniformity inside and outside, the preheating time can be shortened.

In a specific embodiment, the above-mentioned heating assembly further includes a fixing member 9 and a support frame 8 for fixing the heating assembly in the oven box. Wherein: the metal heating tube 7 includes a heating tube body, and a first connection end and a second connection end for connecting the heating circuit. An annular heating area is formed; the instantaneous heat pipe 6 is fixedly installed in the annular heating area through the support frame 8 . Therefore, as shown in FIG. 2 , the metal heating pipe 7 forms an annular heating area around the circumference, so as to be arranged around the outer side of the instantaneous heat pipe 6 . Specifically, the two connecting ends of the metal heating tube 7 both extend backward and pass through the fixing member 9 to be electrically connected to the wires located on the rear side of the oven.

Specifically, the support frame 8 includes a first support frame 81 and a second support frame 82, and the heating pipe body includes a first heating section 71, a second heating section 72, a third heating section 73, a fourth heating section 74, The fifth heating section 75, wherein: the first heating section 71 and the third heating section 73 are parallel and connected with the first support frame 81 respectively; the fifth heating section 75 and the third heating section 73 are parallel and are respectively connected with the second support The frame 82 is connected; the instant heat pipe 6 is fixedly installed in the annular heating area through the first support frame 81 and the second support frame 82 .

Specifically, as shown in FIG. 2 , two or more instantaneous heat pipes 6 are arranged side by side in the annular heating area formed by the metal heating pipes 7 .

Specifically, please refer to Figure 2, Figure 5, and Figure 6:

One end of the first support frame 81 is provided with a first mounting hole for screwing with the fixing member 9, and the other end is provided with a second mounting hole for screwing with the inner wall of the box (specifically, the side wall provided with the box door). The main body of the first support frame 81 is provided with a first groove for supporting the first heating section 71 , a second groove for supporting the instantaneous heat pipe 6 , and a third groove for supporting the third heating section 73 . groove;

One end of the second support frame 82 is provided with a third mounting hole for screwing with the fixing member 9, and the other end is provided with a fourth mounting hole for screwing with the inner wall of the box (specifically, the side wall provided with the box door). The main body of the second support frame 82 is provided with a fourth groove for supporting the fifth heating segment 75 , a fifth groove for supporting the instantaneous heat pipe 6 , and a sixth groove for supporting the third heating segment 73 . groove.

It should be noted here that due to the heavy weight of the metal heating pipe 7, the two connecting ends of the metal heating pipe 7 are extended backward to the rear wall of the oven, and are fixedly installed on the rear wall of the oven through the fixing member 9; at the same time, Because one end of the first support frame 81 is fixedly connected with the fixing member 9, the other end is fixedly connected with the side wall provided with the box door, one end of the second support frame 82 is fixedly connected with the fixing member 9, and the other end is fixedly connected with the fixing member 9 provided with the box door. The side walls are fixedly connected, so as to play a stable supporting role for the metal heating tube 7 .

Specifically, referring to FIGS. 2 , 5 and 6 , in order to prevent chaotic and complicated wiring arrangement in the oven cavity, the main body of the first support frame 81 is provided with a first lead slot 171 for accommodating the leads of the instant heat pipe 6 , and a second lead slot 171 is provided on the main body of the first support frame 81 The main body of the support frame 82 is provided with a second lead slot 172 for accommodating the lead wire of the instantaneous heat pipe 6 . Therefore, after the instant heat pipe 6 is installed on the support frame, the leads at both ends are respectively nested in the first lead groove 171 and the second lead groove 172, and extend along the length direction of the support frame to the fixing member located on the rear wall of the oven 9, and connect to the electrical components located on the rear side of the oven through the through holes on the fixing member 9 to energize.

When assembling the heating assembly, first nest the instantaneous heat pipe 6 and the metal heating pipe 7 in the above-mentioned grooves of the first support frame 81 and the second support frame 82, and then place one end of the first support frame 81 and the second support frame 82 One end of the metal heating pipe 7 and the two connecting ends of the metal heating pipe 7 are respectively fixed with the fixing member 9, and the heating assembly composed of the instant heat pipe 6 and the metal heating pipe 7 as shown in FIG. 2 can be obtained.

Specifically, the above-mentioned fixing member 9 is a plate-shaped fixing member, and both the first supporting frame 81 and the second supporting frame 82 are formed by bending a strip-shaped plate-shaped member.

In a specific embodiment, as shown in FIG. 1 , the above-mentioned heating assembly may be arranged at the ceiling of the oven cavity. Specifically, each instantaneous heat pipe 6 is a straight pipe structure, located in the middle area of the top of the oven, far away from each side wall, and can be parallel to the box door panel in the closed state or perpendicular to the box door panel in the closed state. However, it is not limited to this. In other specific embodiments, the above-mentioned heating components can also be arranged on the inner lower side, and/or the left and right sides, and/or the rear side of the oven cavity; To improve the performance or increase the power, arrange more instant heat pipes 6, or reasonably design the specific structure of the instant heat pipes 6 to be U-shaped tubes or coils, etc.

In a preferred embodiment, please refer to FIG. 4 , FIG. 7 and FIG. 8 , the above heating core is a graphene coating 15 arranged on the inner wall of the hollow tube 12 for conductive heating. Moreover, both ends of the hollow tube 12 are respectively provided with end assemblies, the end assemblies include insulating plugs 11 , tabs 13 electrically connected to the graphene coating 15 , and leads 14 connected to the tabs 13 . in:

The tab 13 is fixedly arranged in the hollow tube 12, specifically a copper ring adapted to the inner wall of the hollow tube 12;

The insulating plug 11 is used to close the end orifice of the hollow tube 12;

The insulating plug 11 is provided with an internal channel, one end of the lead 14 is connected to the tab 13, and the other end extends out of the hollow tube 12 through the internal channel;

The hollow tube 12 forms a sealed space through the insulating plugs 11 installed on the two ends of the tube, and the sealed space is filled with an inert gas.

Specifically, the insulating plug 11 includes an inner connection end that extends into the end orifice of the hollow tube 12 and is adapted to it, and an outer connection end located outside the end orifice of the hollow tube 12, the outer connection end is provided with a supporting The groove on the frame is adapted to the annular groove, through which the instantaneous heat pipe 6 can be fixed in the axial position.

Preferably, the material of the hollow tube 12 is quartz. However, it is not limited to this, and in other specific embodiments, the material of the hollow tube 12 may also be a high temperature resistant material such as mica/microcrystalline/glass.

It should be noted here that graphene is the best conductive and thermally conductive material, and its heating process has powerful advantages such as rapid temperature rise and uniform heat generation. Using this characteristic of graphene in the oven can meet the technical requirements of instantaneous heat when it is turned on. Tests have proved that the total conversion rate of effective electric heat energy of the variable temperature oven provided by the embodiment of the present utility model can reach more than 99% during use. Moreover, the superconductivity of graphene can ensure heating stability, high electrical and thermal conductivity, and can realize the instantaneous heating of the oven when it is turned on, and achieve the instantaneous heating effect of at least 300 °C in 5s without preheating.

Specifically, the manufacturing process of the instant heat pipe 6 provided with the graphene coating 15 is as follows:

The graphene conductive heating coating (that is, the graphene coating 15) is coated on the inner wall surface of the hollow tube 12 of the quartz material, and is communicated as a whole along the axial direction of the hollow tube 12;

In the hollow tube 12, a coating blank area is respectively set aside near the nozzles at both ends, and the tab 13 connected to the graphene coating 15 is arranged in this blank area, and the function of the tab 13 is to connect the lead 14;

The two ends of the hollow tube 12 are encapsulated by high temperature-resistant insulating plugs 11, and the insulating plugs 11 are provided with internal channels to facilitate the lead wires 14 to pass through;

In order to improve reliability, maximum high temperature resistance and prolong service life, the hollow tube 12 is evacuated and then filled with inert gas, and then sealed through the insulating plug 11;

It is nested on the support frame through the annular groove of the insulating plug 11 on the outside of the hollow tube 12 .

Wherein, the heating principle of the instantaneous heat pipe 6 provided with the graphene coating 15 is as follows:

Based on the characteristics of single-layer graphene, when the electrodes at both ends of the graphene coating 15 are energized, the carbon molecules in the graphene coating generate phonons, electrons and ions in the resistance, which are caused by the Brownian motion of the generated carbon molecules. generate heat energy.

It should be noted here that graphene has extremely high electrical conductivity, so it is plated in the insulating pipe (hollow pipe 12) in the form of a coating, and is assembled in the oven as a heating pipe in the structural form of the instantaneous heat pipe 6. After the instantaneous heat pipe 6 is energized, the heat is conducted by the graphene coating 15 through the tube wall of the hollow tube 12 to the air in the oven cavity, and the food is heated through the heat conduction and convection of the air, and the heat energy generated by the graphene coating 15 will pass through. Control the wavelength to radiate outward at 5 to 14 microns, and directly heat the food by radiation. Therefore, the hollow tube 12 is made of a material with high infrared transmittance (such as quartz), which has the advantages of high softening temperature, low thermal expansion coefficient, high mechanical strength, and good chemical stability, and is suitable for high temperature working environment in the oven.

In a specific embodiment, the above-mentioned first switch for the metal heating pipe 7 and the second switch for controlling the instantaneous heat pipe 6 can both be manual switches, so as to manually adjust the heating mode according to actual needs.

Alternatively, in a preferred embodiment, the opening and closing of the metal heating pipe 7 and the instantaneous heat pipe 6 are automatically opened and closed according to the preset baking mode in the oven. For example, a controller is provided in a temperature-variable oven, and the first switch and the second switch are respectively connected to the controller signal. Through the controller, the metal heating tube 7 and the instantaneous heat tube 6 can be automatically controlled to be energized and heated at the same time, and the metal heating tube 7 can be controlled. and the instantaneous heat pipe 6 are separately energized and heated to form an intelligent variable temperature oven.

In a specific embodiment, a variety of heating modes can be preset in the intelligent variable temperature oven, which is the best heating mode that the user can match for different types of food. For example, for food that is suitable for instantaneous heat on the surface, shorten the heating time to improve the taste of the food; for food that requires high temperature uniformity inside and outside, shorten the preheating time.

Therefore, the first specific embodiment of the present invention provides a temperature-variable control method suitable for the above-mentioned variable-temperature oven. The temperature-variable control method includes a grilling mode and a baking mode, and the baking mode is divided into a first baking mode and a second baking mode.

Specifically, when the variable temperature oven starts the barbecue mode, the following steps are included:

Step S101: Presetting the heating temperature and heating time in the barbecue mode;

Step S102: both the metal heating tube 7 and the instantaneous heat tube 6 are electrically heated;

This grilling mode is suitable for cooking requirements for foods that are coke on the outside and tender on the inside (such as grilled fish, steak, skewers, etc.). For specific operations, you can first set the heating temperature and heating time in the grill mode, then put the ingredients into the oven and close the door. Alternatively, as shown in FIG. 9 , first put the ingredients into the oven and close the oven door, and then set the heating temperature and heating time in the grilling mode. In the barbecue mode, both the metal heating tube 7 and the instantaneous heat tube 6 are heated by electricity until the work ends. The metal heating tube 7 and the instantaneous heat tube 6 are heated by electricity at the same time, which can ensure that the box is turned on smoothly without preheating, and the heating speed is fast, which can ensure the best taste of meat and other ingredients.

Specifically, the first baking mode includes the following steps:

Step S201: preset the preheating temperature in the baking mode;

Step S202: Both the metal heating tube 7 and the instantaneous heat tube 6 are energized and heated, until the temperature in the box reaches the preheating temperature, the instantaneous heat tube 6 is turned off, and only the metal heating tube 7 is kept energized for heating.

The first baking mode is suitable for the cooking requirements of foods with soft interiors (eg cakes, etc.). During the specific operation, when the temperature inside the box reaches the preheating temperature and the instantaneous heat pipe 6 is turned off, the ingredients are put into the oven. After that, only the metal heating tube 7 is kept energized and heated until the end of the work. Compared with traditional ovens, this heating method has no limitations in the adaptability of ingredients, and can shorten the heating time of food, reduce heating power, and improve the baking effect.

Specifically, the second baking mode includes the following steps:

Step S201: preset the preheating temperature in the baking mode;

Step S202: both the metal heating tube 7 and the instantaneous heat tube 6 are energized and heated, until the temperature in the box reaches the preheating temperature, the instantaneous heat tube 6 is turned off, and only the metal heating tube 7 is kept energized and heated;

Step S203 : After the metal heating tube 7 is energized and heated for a preset time, the instant heat pipe 6 is turned on, so that both the instant heat pipe 6 and the metal heating pipe 7 are in the energized heating state.

The second baking mode is suitable for the cooking requirements of foods with soft interior and crisp exterior (eg, pizza, egg tarts, etc.). During the specific operation, when the temperature inside the box reaches the preheating temperature and the instantaneous heat pipe 6 is turned off, the ingredients are put into the oven. The heating temperature is then automatically adjusted by the oven.

Second specific embodiment

Referring to FIGS. 10 and 11 , the second embodiment of the present invention provides a temperature-variable oven, which differs from the above-mentioned first embodiment only in that the heating core is arranged in the hollow tube 12 and is the same as the hollow tube 12 . Carbon fiber heating filaments 18 arranged on a shaft.

Specifically, the carbon fiber heating wire 18 is in a spiral coiled structure.

Specifically, both ends of the hollow tube 12 are respectively provided with end assemblies, and the end assemblies include insulating plugs 11 and lead wires 14 electrically connected to the carbon fiber heating wire 18 . Wherein: the insulating plug 11 is used to close the end nozzle of the hollow tube 12; the insulating plug 11 is provided with an internal channel, one end of the lead 14 is connected with the carbon fiber heating wire 18, and the other end extends out of the hollow tube 12 through the internal channel; The hollow tube 12 forms a sealed space through the insulating plugs 11 installed on the two ends of the tube, and the sealed space is filled with an inert gas.

It should be noted here that the electrothermal conversion efficiency of carbon fiber materials is as high as 95%, and its thermal conductivity in the fiber direction is 1.6 times that of pure copper and 2.7 times that of aluminum. It is mainly based on far-infrared radiation, of which the far-infrared radiation efficiency reaches more than 70%. Applying carbon fiber to the oven can achieve the technical requirements of rapid heating. The main component of carbon fiber is carbon. The principle of using carbon fiber to heat by electricity is: after the carbon atoms in the carbon fiber are excited by the electrons in the current, the electrons in the carbon atoms become excited states to generate energy level jumps, and vibrations with a wavelength of 4 to 20 microns occur. Electron vibrations generate heat, which is transferred by thermal radiation in the form of electromagnetic waves.

To sum up, the specific working mode of the variable temperature oven provided by the embodiment of the present utility model is as follows:

After the heating component is energized to generate heat, the heat is transmitted by radiation on the one hand, and the infrared light is irradiated on the food for heating; on the other hand, the hot air in the cavity is used to heat the food by means of heat conduction and convection.

For the food to be grilled, some ingredients such as meat are expected to be crispy on the outside and tender on the inside. During the roasting process, the outer surface of the food needs to be quickly heated to lock in moisture; another type of food For example, in cakes, it is hoped that the food can be heated evenly inside and outside to prevent the outside being scorched and the inside being undercooked. For different ingredients, different baking modes are preset in the oven, different food matches are suitable for heating methods, and the opening of the heating tube is controlled. like:

When roasting meat food, the instant heat pipe and the metal heating pipe work at the same time, without preheating, the food can be placed directly in the oven, and the oven is turned on for instant heat, which can bake the food crispy on the outside and tender on the inside;

When baking cakes and other foods, the oven cavity can be preheated first, and the instant heat pipe and the metal heating pipe can be turned on at the same time to preheat the oven to the target temperature, and then the instant heat pipe can be turned off, and only the metal heating pipe is used to bake the food. Compared with traditional ovens, this heating method has no limitations in the adaptability of ingredients, and can shorten the heating time of food, reduce heating power, and improve the baking effect.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The variable temperature oven is characterized by comprising an oven body and a heating assembly, wherein the heating assembly comprises a metal heating pipe (7) and a transient heat pipe (6), and the variable temperature oven comprises:

the instantaneous heat pipe (6) comprises a hollow pipe (12) made of high-temperature-resistant materials and a heating core arranged in the hollow pipe (12), and the electric-heat conversion efficiency of the heating core is greater than that of the metal heating pipe (7);

the metal heating pipe (7) is controlled to be electrified and heated through a first switch, and the instantaneous heating pipe (6) is controlled to be electrified and heated through a second switch.

2. The variable temperature oven of claim 1, wherein the first switch and the second switch are both manual switches.

3. The temperature-changing oven according to claim 1, characterized in that a controller is further provided in the temperature-changing oven, the first switch and the second switch are respectively in signal connection with the controller, the controller can control the metal heating pipe (7) and the instantaneous heat pipe (6) to be simultaneously energized for heating, and can control the metal heating pipe (7) and the instantaneous heat pipe (6) to be separately energized for heating.

4. The variable temperature oven according to claim 1, further comprising a fixing member (9) and a support frame (8) in the heating assembly, wherein:

the metal heating pipe (7) comprises a heating pipe body, a first connecting end and a second connecting end, the first connecting end and the second connecting end are used for connecting a heating circuit, the first connecting end and the second connecting end are fixedly arranged in the box body through the fixing piece (9), and the heating pipe body forms an annular heating area;

the instantaneous heat pipe (6) is fixedly installed in the annular heating area through the supporting frame (8).

5. The variable temperature oven according to claim 4, characterized in that the support frame (8) comprises a first support frame (81) and a second support frame (82), and the heating tube body comprises a first heating section (71), a second heating section (72), a third heating section (73), a fourth heating section (74), and a fifth heating section (75) connected in sequence, wherein:

the first heating section (71) and the third heating section (73) are parallel and are respectively connected with the first support frame (81);

the fifth heating section (75) and the third heating section (73) are parallel and are respectively connected with the second support frame (82);

the instantaneous heat pipe (6) is fixedly installed in the annular heating area through the first supporting frame (81) and the second supporting frame (82).

6. The temperature swing oven according to claim 5, characterized in that the body of the first support frame (81) is provided with a first lead groove (171) for receiving leads of the transient heat pipe (6);

the main body of the second support frame (82) is provided with a second lead groove (172) for accommodating a lead of the instantaneous heat pipe (6).

7. The variable temperature oven according to any one of claims 1 to 6, characterized in that the heating core is a graphene coating (15) disposed on the inner wall of the hollow tube (12) for conductive heating.

8. The variable temperature oven according to claim 7, characterized in that the hollow tube (12) is provided with end assemblies at both ends thereof, the end assemblies comprising an insulating plug (11), a tab (13) electrically connected with the graphene coating (15), and a lead (14) connected with the tab (13), wherein:

the tab (13) is fixedly arranged in the hollow pipe (12);

the insulating plug (11) is used for closing the end pipe orifice of the hollow pipe (12);

the insulating plug (11) is provided with an internal channel, one end of the lead (14) is connected with the tab (13), and the other end of the lead extends out of the hollow tube (12) through the internal channel;

the hollow pipe (12) forms a sealed space through the insulating plugs (11) arranged at the pipe orifices at the two ends, and the sealed space is filled with inert gas.

9. The temperature swing oven according to any one of claims 1 to 5, characterized in that said heating core is a carbon fiber heating wire (18) disposed within said hollow tube (12) and arranged coaxially with said hollow tube (12).

10. The variable temperature oven according to claim 9, characterized in that both ends of the hollow tube (12) are respectively provided with an end assembly comprising an insulating plug (11), and a lead wire (14) electrically connected with the carbon fiber heating wire (18), wherein:

the insulating plug (11) is used for closing the end pipe orifice of the hollow pipe (12);

the insulation plug (11) is provided with an internal channel, one end of the lead (14) is connected with the carbon fiber heating wire (18), and the other end of the lead extends out of the hollow tube (12) through the internal channel;

the hollow pipe (12) forms a sealed space through the insulating plugs (11) arranged at the pipe orifices at the two ends, and the sealed space is filled with inert gas.

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