Thermal cycle device for open oven and oven for preparing food

Abstract

The embodiment of the utility model provides a thermal circulation device for an open oven and an oven for preparing food, the thermal circulation device for the open oven comprises a hot air circulation chamber, the hot air circulation chamber is internally provided with a circulation fan, and the hot air circulation chamber is provided with a first air inlet and a first air outlet; the first air inlet, the circulating fan and the first air outlet form a first circulating channel; hot air outside the hot air circulation chamber flows to the first air outlet through the first air inlet; the air outlet direction of the first air outlet extends towards the bottom of the oven so that hot air in the hot air circulation chamber can be blown to the bottom of the oven. According to the embodiment of the utility model, through the thermal circulation device, the problem that food to be baked is frequently turned over due to non-uniform heating in the oven can be solved; the hot air collecting mechanism effectively utilizes heat discharged from the oven opening of the oven for secondary recycling, internal and external temperature interchange is prevented, the heat utilization rate is increased, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of food processing equipment, in particular to a heat circulation device for an open roasting furnace and a roasting furnace for preparing food. Background Art

[0002] This section introduces to the reader the background art that may be related to various aspects of the embodiments of the present utility model, and it is believed that it can provide useful background information to the reader, thus helping the reader better understand various aspects of the embodiments of the present utility model. Therefore, it can be understood that the description of this section is for the above purposes and does not constitute an admission of the prior art.

[0003] Roast duck is a famous delicacy in our country. At present, traditional hanging furnaces are generally used to roast ducks in our country. The ducks are hung on brackets and burned with fruit wood firewood or gas, etc. inside the furnace mouth, and the temperature inside the furnace is increased through the natural heat radiation of the heat source. The heat is transferred to the ducks inside the furnace, and the ducks are roasted during a long baking process. However, due to the fixed position of the heat source, the heated hot air is relatively light, resulting in a high temperature in the upper part of the furnace and a low temperature in the lower part. There is also a large temperature difference between the front and back of the heat source, which easily causes uneven heating of the ducks inside the furnace.

[0004] During the roasting process, in order to make the roast duck heated evenly and avoid the uneven temperature inside the furnace affecting the taste of the roast duck in the roasting furnace, the roast duck chef needs to judge the degree of doneness according to the color of each part of the duck roasted inside the furnace. In addition, it is also necessary for the staff to constantly change the position of the duck to make the duck heated evenly. This traditional roasting process is time-consuming and laborious, and the labor intensity of the staff is high. It also requires the roast duck chef to have good experience and skills. In addition, since generally the duck furnace is open and the furnace mouth is exposed, most of the heat in the upper part of the roasting furnace overflows through the furnace mouth and is sucked away along the smoke exhaust pipe, resulting in low energy heat utilization rate, causing waste of heat sources and being unfavorable for energy conservation and emission reduction. Summary of the Utility Model

[0005] The problem to be solved by the embodiments of the present utility model is how to provide a heat circulation device for an open roasting furnace and a roasting furnace for preparing food.

[0006] In view of the defects in the prior art, the embodiments of the present utility model provide a heat circulation device for an open roasting furnace, which can effectively recycle the heat inside the roasting furnace.

[0007] In a first aspect, the embodiments of the present utility model provide a heat circulation device for an open roasting furnace, including: a hot air circulation chamber, a circulation fan is arranged inside the hot air circulation chamber, and the hot air circulation chamber is provided with a first air inlet and a first air outlet; the first air inlet, the circulation fan and the first air outlet form a first circulation channel;

[0008] The circulation fan is used to direct the hot air in the circulation chamber towards the first air outlet; and / or,

[0009] Direct the hot air outside the hot air circulation chamber towards the first air outlet through the first air inlet;

[0010] The air outlet direction of the first air outlet extends towards the bottom of the oven, so as to blow the hot air in the hot air circulation chamber towards the bottom of the oven.

[0011] In some other embodiments of the hot air circulation device for an open oven described in this specification, a heating mechanism is further included;

[0012] The heating mechanism is arranged on the first circulation channel in the hot air circulation chamber; and / or,

[0013] The heating mechanism is arranged at the first air inlet outside the hot air circulation chamber.

[0014] In some other embodiments of the hot air circulation device for an open oven described in this specification, a hot air collection mechanism is further included. The hot air collection mechanism is communicated with the hot air circulation chamber. The hot air collection mechanism is provided with a second air inlet, and the second air inlet, the hot air collection mechanism, the circulation fan and the first air outlet form a second circulation channel.

[0015] In some other embodiments of the hot air circulation device for an open oven described in this specification, the hot air collection mechanism includes a collection pipeline. The collection pipeline is provided with a second air inlet, and the second air inlet is arranged at the inner top of the oven opening of the oven.

[0016] In some other embodiments of the hot air circulation device for an open oven described in this specification, a wind guiding mechanism is arranged at the first air outlet, and the wind guiding mechanism guides the air outlet direction of the first air outlet to extend towards the bottom of the oven.

[0017] In some other embodiments of the hot air circulation device for an open oven described in this specification, the wind guiding mechanism is a plurality of fan-shaped arranged wind guiding pipes.

[0018] In some other embodiments of the hot air circulation device for an open oven described in this specification, the hot air circulation chamber is provided with a second air outlet, and the air outlet direction of the second air outlet extends upwards above the hot air circulation chamber.

[0019] In some other embodiments of the hot air circulation device for an open oven described in this specification, a wind distribution device is arranged in the hot air circulation chamber for distributing the hot air from the hot air circulation chamber to the first air outlet or the second air outlet. The wind distribution device is arranged in the air outlet direction of the circulation fan.

[0020] In some other embodiments of the heat circulation device for an open oven described in this specification, the air distribution device includes a rotating shaft, and a wind guide plate is arranged on the rotating shaft. The wind guide plate rotates along the rotating shaft to switch the wind direction.

[0021] In some other embodiments of the heat circulation device for an open oven described in this specification, the second air outlets are arranged in pairs, and air guide pipes are arranged at the second air outlets. The extending direction of the outlets of the air guide pipes faces the middle part above the hot air circulation chamber.

[0022] Second aspect, an embodiment of the present invention provides an oven for preparing food, including:

[0023] An oven body, the oven body includes an oven wall, and the oven wall encloses an accommodating chamber for baking food;

[0024] An oven opening is arranged on the oven wall, and a heat circulation device is arranged at the oven opening. The heat circulation device changes the air flow direction in the oven body to circulate in a predetermined direction;

[0025] The heat circulation device is the heat circulation device for an open oven described above.

[0026] It can be seen from the above technical solutions that the heat circulation device for an open oven and the oven for preparing food provided by the embodiments of the present invention can solve the problem of frequently turning the food to be baked due to uneven heating in the oven through the heat circulation device; the heat discharged outside the oven opening of the oven can be effectively recycled through the hot air collection mechanism, preventing the internal and external temperatures from being exchanged, improving the heat utilization rate, and achieving the effect of energy saving. The heat circulation device for an open oven and the oven for preparing food provided by the embodiments of the present invention can reduce two-thirds of the heat loss, correspondingly save two-thirds of the energy consumption, and also reduce two-thirds of the exhaust gas emissions generated after the oven consumes fuel, reducing air pollution while achieving energy savings. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic side view structure diagram of a heat circulation device for an open oven in an embodiment of the present invention;

[0029] Figure 2It is a schematic side view structure diagram of a heat circulation device for an open-type oven in an embodiment of the present utility model;

[0030] Figure 3 It is a schematic side view structure diagram of a heat circulation device for an open-type oven in another embodiment of the present utility model;

[0031] Figure 4 It is a schematic side view structure diagram of a heat circulation ring device for an open-type oven in an embodiment of the present utility model;

[0032] Figure 5 It is a schematic front view structure diagram of a heat circulation device for an open-type oven in an embodiment of the present utility model;

[0033] Figure 6 It is a schematic side view structure diagram of a heat circulation ring device for an open-type oven in an embodiment of the present utility model;

[0034] Figure 7 It is a schematic front view structure diagram of a heat circulation device for an open-type oven in an embodiment of the present utility model;

[0035] Figure 8 It is a schematic top view structure diagram of a heat circulation device for an open-type oven in an embodiment of the present utility model;

[0036] Figure 9 It is a schematic top view structure diagram of a heat circulation device for an open-type oven in an embodiment of the present utility model;

[0037] Figure 10 It is a schematic top view structure diagram of a heat circulation device for an open-type oven in an embodiment of the present utility model;

[0038] Figure 11 It is a schematic side view structure diagram of a heat circulation device for an open-type oven in an embodiment of the present utility model;

[0039] Figure 12 It is a schematic front view structure diagram of a heat circulation device for an open-type oven in an embodiment of the present utility model;

[0040] Figure 13 It is a schematic side view structure diagram of an oven for preparing food in an embodiment of the present utility model;

[0041] Figure 14 It is a schematic front view structure diagram of an oven for preparing food in an embodiment of the present utility model. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0043] As Figures 1 to 5 shown, a heat circulation device for an open oven provided by an embodiment of the present utility model includes: a hot air circulation chamber 1, a circulation fan 2 is arranged in the hot air circulation chamber 1, and the hot air circulation chamber 1 is provided with a first air inlet 11 and a first air outlet 12; the first air inlet 11, the circulation fan 2, and the first air outlet 12 form a first circulation channel 10; hot air outside the hot air circulation chamber is sent to the first air outlet 21 through the first air inlet 11; the air outlet direction of the first air outlet 12 extends towards the bottom of the oven, so as to blow the hot air in the hot air circulation chamber 1 towards the bottom of the oven. The following will give a detailed description of the heat circulation device for an open oven provided by the embodiment of the present utility model.

[0044] As Figures 1 to 5 shown, in the embodiment of the present utility model, hot air overflowing inside and outside the oven is inhaled through the first air inlet 11, circulated again through the circulation fan 2 arranged in the hot air circulation chamber 1, discharged from the first air outlet 12, and flows from the bottom of the food upwards again, baking the food in the oven, effectively recycling the heat discharged from the furnace mouth of the oven for secondary use.

[0045] As Figure 2 shown, in an embodiment of the present utility model, a heating mechanism 3 is arranged on the first circulation channel 10 in the circulation chamber 1. The circulation fan 2 is used to send the hot air heated by the heating mechanism 3 in the circulation chamber 1 to the first air outlet 12; a heating mechanism is arranged in the circulation chamber 1. After the circulation fan 2 operates, air is inhaled from the first air inlet 11, heated after passing through the heating mechanism 13, and discharged from the first air outlet 12. The heating mechanism 3 can be an electric furnace. The electric furnace heats the cold air inhaled from the first air inlet 11, and the hot air discharged from the first air outlet 12 directly flows from the bottom of the food upwards, baking the food in the oven.

[0046] As Figures 3 to 5As shown, in another embodiment of the utility model, the heat circulation device for an open oven comprises: a hot air circulation chamber 1, wherein a circulation fan 2 is provided in the hot air circulation chamber 1, and the hot air circulation chamber 1 is provided with a first air inlet 11 and a first air outlet 12; the first air inlet 11, the circulation fan 2 and the first air outlet 12 form a first circulation channel 10; the air outlet direction of the first air outlet 12 extends toward the bottom of the oven, so as to blow the hot air in the hot air circulation chamber 1 toward the bottom of the oven; a heating mechanism 3 is provided at the first air inlet 11 outside the circulation chamber.

[0047] In the embodiment of the present utility model, Figures 3 to 5 As shown, the heating mechanism 3 is arranged outside the first air inlet 11. When the air passes through the heating mechanism 13, it is heated by the heating mechanism 13. After the circulation fan 2 is running, it continuously sucks the air from the first air inlet 11 and discharges it from the first air outlet 12. The hot air discharged from the first air outlet 12 flows directly from the bottom of the food from bottom to top to bake the food in the oven. The heating mechanism 3 can be an electric furnace, a gas furnace, or a firewood furnace.

[0048] like Figures 1 to 12 As shown, in the embodiment of the utility model, the circulating fan 2 includes a fan and a motor connected thereto. The motor can be connected to the fan through a long shaft. The motor is arranged outside the hot air circulation chamber 1 and can be cooled by a water cooling system.

[0049] In the embodiment of the present utility model, Figures 4 - 7 and Figure 11 , Figure 12As shown, it further includes a hot air collection mechanism 4. The hot air collection mechanism 4 is communicated with the hot air circulation chamber 1. The hot air collection mechanism 4 is provided with a second air inlet 21. The second air inlet 21, the hot air collection mechanism 4, the circulation fan 2 and the first air outlet 12 form a second circulation channel 20. The hot air collection mechanism 4 includes a collection pipeline 40. The collection pipeline 40 is provided with a second air inlet 21. The second air inlet 21 is arranged at the inner top of the furnace mouth of the oven. By arranging the second air inlet 21 on the collection pipeline 40, the hot air overflowing above the oven can be collected, recycled again by the circulation fan 2 arranged in the hot air circulation chamber 1, discharged from the first air outlet 12, and then flow through the bottom of the food from bottom to top again to bake the food in the oven. The embodiment of the utility model effectively utilizes the heat discharged from the furnace mouth of the oven for secondary recycling, improves the heat utilization rate and saves energy. Of course, it can be understood that the utility model is not limited to this. The hot air collection mechanism 4 can be directly arranged outside the first air inlet 11 to communicate with the hot air circulation chamber 1, and the second air inlet 21 can be extended and connected to the position where hot air needs to be collected through a pipeline. The hot air collection mechanism 4 and the circulation fan 2 can be two sets, respectively arranged on both sides of the oven.

[0050] In the embodiment of the present utility model, as Figures 8 - 10 shown, in order to effectively ensure that the hot air blown out from the first air outlet 12 passes through the bottom of the oven and uniformly heats the food in the oven, a wind guiding mechanism 121 is arranged at the first air outlet 12. The wind guiding mechanism 12 guides the air outlet direction of the first air outlet 12 to extend towards the bottom direction of the oven. The wind guiding mechanism 121 can be arranged inside the hot air circulation chamber 1 or outside the hot air circulation chamber 1. In order to disperse the hot air at the first air outlet 12 to make it more evenly fill the bottom of the oven, the wind guiding mechanism 12 is a plurality of fan-shaped arranged air guiding pipes 120.

[0051] When roasting ducks, sometimes due to individual differences of the ducks, when multiple ducks in one furnace are roasted, there may be a certain color difference in the skin color of the ducks. In order to make the appearance colors of the ducks consistent, the roasted ducks 8 need to be subjected to high-temperature singeing treatment, as Figures 11 to 13As shown, in the embodiment of the utility model, in order to further improve the taste of the roast duck 8 during baking and unify the appearance of the roast duck 8, the hot air circulation chamber is provided with a second air outlet 22, and the air outlet direction of the second air outlet 22 extends toward the top of the hot air circulation chamber 1. When baking food, the second air outlet 22 can simulate the effect of the original wood-fired smoked roast duck. The hot air circulation chamber 1 is provided with an air distribution device 13 for distributing the hot air from the hot air circulation chamber 1 to the first air outlet 12 or the second air outlet 22, and the air distribution device 13 is arranged in the air outlet direction of the circulating fan 2. Further, the air distribution device includes a rotating shaft 130, and an air guide plate 131 is arranged on the rotating shaft, and the air guide plate 131 rotates along the rotating shaft 130 to switch the wind direction. The second air outlet 22 is arranged in pairs, and an air guide duct 220 is arranged at the second air outlet 22, and the outlet extension direction of the air guide duct 220 is toward the middle of the upper part of the hot air circulation chamber 1. When the roasted duck needs to be roasted at high temperature, the hot air from the hot air circulation chamber 1 can be distributed from the first air outlet 12 to the second air outlet 22 through the air distribution device 13, and the hot air is blown centrally. The duck roaster uses a duck-picking rod to roast the duck 8, so that the roasted duck 8 has a uniform color and taste. The air distribution device 13 can be driven and switched manually, or it can be controlled and switched electrically.

[0052] The heat circulation device for an open oven provided by the embodiment of the utility model can be installed on the basis of an existing open oven, which can solve the problem of uneven heating in the oven and reduce the problem of repeatedly turning the food to be baked due to uneven heating; at the same time, by installing the heat circulation device, the hot air collection mechanism 4 is connected to the hot air circulation chamber 1, and hot air is sucked in from a relatively high place inside the oven mouth, and the collected hot air is further circulated and discharged to the bottom of the oven, so that the food to be baked in the oven is evenly heated and the heat discharged can be effectively reused for a second time, thereby improving the utilization rate of thermal energy. The heat circulation device for an open oven provided by the embodiment of the utility model can be applied not only to roast duck ovens, but also to open ovens such as roast chicken ovens and pizza ovens.

[0053] In the embodiment of the present utility model, Figures 13 - 14 As shown, in order to further reflect the advanced nature of the thermal circulation device for an open oven provided by the utility model, an embodiment of the utility model also provides an oven for preparing food, including: an oven body 6, the oven body includes an oven wall 61, the oven wall encloses a accommodating chamber 60 for baking food; an oven mouth 62 is provided on the oven wall 61, a thermal circulation device is provided at the oven mouth 52, the thermal circulation device 62 changes the direction of the airflow in the oven body 6 to circulate in a predetermined direction; the thermal circulation device is the above-mentioned thermal circulation device for an open oven.

[0054] In summary, the heat circulation device for an open-type oven and the oven for food preparation provided by the embodiments of the present utility model can solve the problem of frequently turning the food to be baked due to uneven heating in the oven through the heat circulation device; the heat outside the oven opening of the oven is effectively utilized for secondary circulation through the hot air collection mechanism, preventing the internal and external temperatures from being exchanged, improving the heat utilization rate, and achieving the effect of energy conservation. The heat circulation device for an open-type oven and the oven for food preparation provided by the embodiments of the present utility model can reduce two-thirds of the heat loss, correspondingly save two-thirds of the energy consumption, and also reduce two-thirds of the exhaust gas emissions generated after the oven consumes fuel, reducing air pollution while saving energy.

[0055] Finally, it should be noted that in the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0056] Furthermore, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element. Unless otherwise expressly stipulated and defined, the terms "installed", "connected", "coupled", "fixed" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the relationship of internal communication and interaction between two elements, unless otherwise expressly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0057] In the description of the present utility model, a large number of specific details are set forth. However, it will be understood that the embodiments of the present utility model may be practiced without these specific details. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification. Similarly, it should be understood that, in order to streamline the disclosure of the present utility model and assist in understanding one or more of the various aspects of the utility model, in the above description of the exemplary embodiments of the present utility model, the various features of the present utility model are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed method should not be construed as reflecting the intention that the claimed present utility model requires more features than those expressly recited in each claim. Rather, as reflected by the claims, the aspects of the utility model lie in less than all of the features of the single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into the detailed description, where each claim stands on its own as a separate embodiment of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. It should be noted that, without conflict or contradiction, the embodiments in the present application and the specific features, structures, materials, or characteristics described in the embodiments may be combined with each other. The present utility model is not limited to any single aspect, nor to any single embodiment, nor to any arbitrary combination and / or permutation of these aspects and / or embodiments. In addition, without contradiction, those skilled in the art may use each aspect and / or embodiment of the present utility model alone or in combination with one or more other aspects and / or their embodiments.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model, and they should all be covered by the scope of the claims and the specification of the present utility model.

Claims

1. A thermal cycling device for an open oven, characterized in that, Comprising: A hot air circulation chamber, in which a circulation fan is arranged. The hot air circulation chamber is provided with a first air inlet and a first air outlet; the first air inlet, the circulation fan and the first air outlet form a first circulation passage; The circulation fan is used to send the hot air in the circulation chamber to the first air outlet; And / or, Send the hot air outside the hot air circulation chamber to the first air outlet through the first air inlet; The air outlet direction of the first air outlet extends towards the bottom direction of the oven, so as to blow the hot air in the hot air circulation chamber towards the bottom of the oven.

2. The thermal cycling device according to claim 1, wherein: It further comprises a heating mechanism; The heating mechanism is arranged on the first circulation passage in the hot air circulation chamber; and / or, The heating mechanism is arranged at the first air inlet outside the hot air circulation chamber.

3. The thermal cycling device according to claim 1, wherein: It further comprises a hot air collection mechanism, which is communicated with the hot air circulation chamber. The hot air collection mechanism is provided with a second air inlet, and the second air inlet, the hot air collection mechanism, the circulation fan and the first air outlet form a second circulation passage.

4. The thermal cycling device according to claim 3, characterized in that: The hot air collection mechanism comprises a collection pipeline, and the second air inlet is arranged on the collection pipeline. The second air inlet is arranged at the inner top of the furnace mouth of the oven.

5. The thermal cycling device according to claim 1, wherein: A wind guiding mechanism is arranged at the first air outlet, and the wind guiding mechanism guides the air outlet direction of the first air outlet to extend towards the bottom direction of the oven.

6. The thermal cycling device according to claim 5, wherein: The wind guiding mechanism is a plurality of fan-shaped arranged wind guiding pipes.

7. The thermal cycling device according to claim 1, wherein: The hot air circulation chamber is provided with a second air outlet, and the air outlet direction of the second air outlet extends upwards of the hot air circulation chamber.

8. The thermal cycling device according to claim 7, wherein: A wind distribution device for distributing the hot air from the hot air circulation chamber to the first air outlet or the second air outlet is arranged in the hot air circulation chamber, and the wind distribution device is arranged in the air outlet direction of the circulation fan.

9. The thermal cycling device according to claim 8, wherein, The wind distribution device comprises a rotating shaft, and a wind guiding plate is arranged on the rotating shaft. The wind guiding plate rotates along the rotating shaft to switch the wind direction.

10. An oven for preparing food, characterized in that, Comprising: A furnace body, which comprises a furnace wall, and the furnace wall encloses an accommodation chamber for baking food; A furnace mouth is arranged on the furnace wall, and a heat circulation device is arranged at the furnace mouth. The heat circulation device changes the air flow direction in the furnace body to circulate in a predetermined direction; The heat circulation device is the heat circulation device for an open-type oven according to any one of claims 1-9.

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