Air heater baffle and baking cooking equipment

Abstract

The utility model provides an air heater baffle and baking cooking equipment, the air heater baffle comprises an air return plate and an air outlet plate connected to the outer periphery of the air return plate, the air outlet plate is provided with a front side and a rear side which are arranged back to back, the air outlet plate is provided with an air outlet hole to penetrate through the front side and the rear side, and the air return plate is provided with an air return hole to penetrate through the front side and the rear side; the air return plate comprises an air collecting part which is arranged in the middle and provided with at least part of air return holes, and one side of the front side of the air collecting part is concave inwards towards the rear side. According to the air heater baffle, the quantity of hot air flowing back to the fan can be increased, the purpose of increasing the quantity of hot air participating in circulation is achieved, more circulating hot air can improve the baking and cooking efficiency and the cooking uniformity of food materials, and food can be baked more quickly and is not prone to being half-cooked.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen furniture, in particular to a hot air blower baffle and baking and cooking equipment. Background Art

[0002] Baking ovens, steam ovens and other equipment bake food by circulating hot air in the inner pot to gradually heat and cook the food. The process of one round of hot air circulation includes: the hot air generated by the fan and the heat pipe passes through the air outlet plate of the hot air blower baffle, then flows through the surface of the food, and then the hot air flows back under the suction action of the fan and approaches the low-pressure area of ​​the fan, and finally the hot air passes through the return air plate of the hot air blower baffle.

[0003] Usually, the hot air in the reflow stage is blocked and interfered by the hot air blower baffle, resulting in a significant reduction in kinetic energy, which makes it difficult for part of the hot air to reflow and the amount of hot air gas returning to the fan and the heat pipe is insufficient, resulting in insufficient hot air volume actually participating in the circulation. As a result, the cooking performance of existing baking and cooking equipment is poor, and the food cooking efficiency and food cooking uniformity need to be improved. Utility Model Content

[0004] In view of this, the utility model provides a hot air blower baffle and a baking cooking device which can improve cooking efficiency and food cooking uniformity.

[0005] The utility model provides a hot air blower baffle plate comprising a return air plate and an air outlet plate connected to the outer periphery of the return air plate, and having a front side and a rear side arranged opposite to each other, the air outlet plate is provided with air outlet holes to pass through the front side and the rear side, and the return air plate is provided with return air holes to pass through the front side and the rear side; the return air plate comprises an air collecting portion which is centrally arranged and provided with at least some return air holes, and one side of the front side of the air collecting portion is concave toward the rear side.

[0006] The utility model has the following beneficial effects: there is a height difference between the air collecting part and the rest of the return air plate, and the air collecting part forms a concave on one side of the front side, thereby forming a concave sinking area for the return hot air to gather. The concave sinking area has a short-term collection and gathering effect on the return hot air, and the difficulty of the hot air that first reaches the concave sinking area to overflow and diffuse to the rest of the return air plate increases, and the hot air will pass through the air collecting part under the pressure of the hot air that arrives later, and then flow back to the fan and the hot air blower baffle. The hot air flow that arrives later will also pass through the air collecting part under the pressure of the hot air that arrives later. Therefore, the hot air blower baffle of the utility model helps to increase the amount of hot air gas that flows back to the fan and the heat pipe, so as to achieve the purpose of increasing the amount of hot air involved in the circulation. More hot air participating in the circulation can improve the baking and cooking efficiency and the uniformity of the cooking of the ingredients, so that the food can be baked faster and is not easy to be undercooked.

[0007] In one embodiment, the air return plate further includes a resistance reducing portion which is bent and connected between the air collecting portion and the air outlet plate, and the air collecting portion and the air outlet plate are inclined toward the front and rear sides of the resistance reducing portion respectively.

[0008] With such arrangement, the wind collecting portion and the resistance reducing portion jointly enclose an inner concave sinking area for temporarily collecting and gathering the return hot air, and the inner concave sinking area improves the gathering effect of the return hot air.

[0009] In one embodiment, both the air collecting portion and the resistance reducing portion are provided with return air holes.

[0010] With this arrangement, the return hot air can not only pass through the air collecting part to return to the fan and the heat pipe, but also pass through the resistance reducing part to return to the fan and the heat pipe, further improving the ability of the return hot air to pass through the return air plate and the circulation volume of the return hot air.

[0011] In one embodiment, the resistance reducing portion extends along the circumferential direction of the wind collecting portion and has an annular conical surface coaxial with the wind collecting portion, and the annular conical surface forms a part of the front side.

[0012] With such arrangement, the resistance reduction part also has the effect of guiding and gathering the return hot air. The return hot air flowing through the annular cone can be guided and gradually approach the axis of the air collecting part. On the whole, the wind beam of the return hot air corresponds coaxially with the return air plate, so as to avoid interference between the return hot air and the baking hot air blown out of the air outlet. When the return hot air flows along the annular cone and approaches the air collecting part, the return hot air has a velocity vector flowing along the axis of the air collecting part. Therefore, the return hot air can pass through the air collecting part quickly and smoothly with greater kinetic energy, which generally reduces the kinetic energy loss of the return hot air when passing through the return air plate, and helps to increase the volume of circulating hot air.

[0013] In one embodiment, the distance between the annular cone surface and the axis of the return air plate increases from the rear side to the front side.

[0014] With such arrangement, the annular conical surface is similar to a funnel-shaped structure, which has a significant effect whether guiding the return hot air to gather toward the axis of the wind collecting part or to surround the return hot air together with the wind collecting part.

[0015] In one embodiment, the diameter of the outer periphery of the wind collecting portion is D1, the diameter of the outer periphery of the resistance reducing portion is D2, and 0.45≤D1 / D2≤0.65.

[0016] With such arrangement, the size relationship between the wind collecting part and the resistance reducing part is reasonable, and both the guiding of the return hot air by the resistance reducing part and the surrounding and gathering of the return hot air by the resistance reducing part can be considered.

[0017] In one embodiment, the resistance reducing portion is integrally formed with the air collecting portion; and / or, the resistance reducing portion is integrally formed with the air outlet plate; and / or, the outer periphery of the resistance reducing portion forms the outer periphery of the return air plate and is connected to the air outlet plate.

[0018] With such arrangement, the hot air blower baffle is simpler to form, easier to produce and has high structural stability.

[0019] In one embodiment, the bending angle between the air outlet plate and the resistance reduction portion is not less than 7° and not more than 15°; and / or the bending angle between the air collecting portion and the resistance reduction portion is not less than 7° and not more than 15°.

[0020] With such arrangement, the shape and structure of the return air plate are reasonable, and while ensuring the guiding and surrounding effect of the resistance reduction part on the return hot air, the total thickness of the entire hot air blower baffle is controlled within a certain range.

[0021] In one embodiment, the rear side includes a layered air collecting back side and an air outlet back side, the air collecting back side is the side of the air collecting part facing away from the front side, the air outlet back side is the side of the air outlet plate facing away from the front side, and the surface distance between the air collecting back side and the air outlet back side is not less than 5 mm and not more than 7 mm.

[0022] In this way, when the fan is set behind the rear side of the hot air blower baffle, the fan's spoiler is not easy to scrape the rear side of the hot air blower baffle, and the fan and the hot air blower baffle can be brought as close as possible, thereby facilitating the arrangement of various functional device structures in the baking cooking equipment.

[0023] In one of the embodiments, the air collecting part is further centrally provided with an avoidance through hole, which passes through the front and rear sides of the air collecting part, and is used to enable the air collecting part to avoid the main body of the fan.

[0024] Such an arrangement can further bring the spoiler of the fan closer to the baffle of the hot air blower, and the fan can rotate normally without the main body scraping the rear side.

[0025] The baking and cooking equipment of the utility model comprises a fan and a hot air blower baffle, and the fan is rotatably arranged at the rear of the rear side.

[0026] In one embodiment, the fan includes a main body coaxial with the air collecting part, and also includes a plurality of spoilers arranged on the outer peripheral side of the main body. The outer peripheral diameter of the return air plate is D3, and the distance from the end of the spoiler to the axis of the main body is R4, 2.2≤D3 / R4≤2.6.

[0027] With this arrangement, the fan specifications match the hot air blower baffle, and the return air plate corresponds to the low-pressure area of ​​the fan along the axial direction of the return air plate, ensuring that the hot air flow circulates sufficiently and stably in the inner tank, thereby maximizing the proportion of the hot air flow actually participating in the circulation to all hot air flows.

[0028] In one embodiment, the return air plate also includes a resistance reduction portion that is bent and connected between the air collecting portion and the air outlet plate. The air collecting portion and the air outlet plate are respectively inclined toward the front and rear sides of the resistance reduction portion. The outer peripheral diameter of the resistance reduction portion is D2, and the distance from one end of the spoiler close to the axis of the main body to the axis of the main body is R5, and 2.4≤D2 / R5≤3.

[0029] With such arrangement, the return hot air passing through the air collecting section can fully correspond to the low-pressure area of ​​the fan, and a part of the return hot air passing through the resistance reduction section can also correspond to the low-pressure area of ​​the fan. The return hot air flowing back to the low-pressure area accounts for a higher proportion of all hot air airflows participating in the circulation, thereby increasing the return speed of the return hot air as a whole and helping to improve baking efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a hot air blower baffle according to an embodiment of the utility model;

[0031] Figure 2 A cross-sectional view of a hot air blower baffle according to an embodiment of the utility model;

[0032] Figure 3 This is a partial structural sectional view of a baking and cooking device according to an embodiment of the present invention.

[0033] Explanation of the reference numerals: 10, return air plate; 11, air collecting portion; 111, air collecting bottom surface; 112, air collecting back surface; 113, avoidance hole; 12, resistance reducing portion; 121, resistance reducing slope surface; 122, resistance reducing back surface; 20, air outlet plate; 21, air outlet front surface; 22, air outlet back surface; 101, front side; 102, rear side; 30, return air hole; 40, air outlet hole; 50, fan; 51, main body; 52, spoiler portion; 521, spoiler far end; 522, spoiler near end. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0036] The utility model provides a hot air blower baffle and a baking cooking device including the hot air blower baffle, wherein the baking cooking device includes a steam oven, a microwave oven and the like. Figure 1-2 The hot air blower baffle includes a return air plate 10 and an air outlet plate 20 connected to the outer periphery of the return air plate 10. The return air plate 10 is provided with a return air hole 30, and the air outlet plate 20 is provided with an air outlet hole 40. Both the return air hole 30 and the air outlet hole 40 are through holes; Figure 3 The baking cooking device further includes an inner pot plate and a hot air unit matched with the hot air blower baffle. The inner pot plate and the hot air blower baffle together form an inner pot space. The hot air unit includes a fan 50 located on the side of the hot air blower baffle away from the inner pot space, and also includes a heating pipe arranged on the periphery of the fan 50. The fan 50 includes a main body 51 and a plurality of spoilers 52 arranged on the outer peripheral side of the main body 51. The main body 51 rotates under the drive of the driving motor and drives the spoilers 52 to disturb the air. The baking cooking device generates a hot air flow through the hot air unit, and heats the food in the inner pot space through the hot air flow to gradually cook the food.

[0037] The hot air flow in the baking and cooking equipment flows according to the following process: after the fan 50 is started, the air is disturbed to form an airflow, the airflow is heated by the heat pipe to form a hot air flow, the hot air flows through the air outlet hole 40 and the air outlet plate 20 to reach the inner pot space, the hot air flows through the surface of the food and turns around under the suction action of the fan 50, thereby forming a return hot air approaching the hot air blower baffle, and finally the return hot air passes through the return air hole 30 and the return air plate 10 to flow back to the hot air unit. As the hot air unit continues to operate, the return hot air is disturbed again and the above process is repeated, thereby circulating between the inner pot space and the hot air unit.

[0038] In order to enable the fan 50 to draw air, the fan 50 that matches the hot air blower baffle is a centrifugal fan 50. The rotation of the centrifugal fan 50 is achieved by driving the main body 51 to rotate around the axis of the main body 51 through a driving motor, and the spoiler 52 rotates around the axis of the main body 51 along with the main body 51. When the centrifugal fan 50 rotates, a low-pressure area is formed between the end of the spoiler 52 that is relatively close to the axis of the main body 51 and the axis of the main body 51. The air pressure in the inner tank space is higher than the low-pressure area. The fan 50 draws air through the low-pressure area, so the hot air flow can turn around and form a return hot air flowing to the low-pressure area. After passing through the return air plate 10, the return hot air can be accelerated again under the disturbance of the spoiler 52, and then flow out radially along the main body 51, and then flow through the heat pipe to be heated. The heated hot air passes through the air outlet plate 20 through the air outlet hole 40 and can be blown to the inner tank space again. Optionally, Figure 3 The fan 50 used in the baking cooking device shown is an open centrifugal fan 50 .

[0039] Specifically, see Figure 2 The hot air blower baffle includes a front side 101 and a rear side 102 which are arranged opposite to each other. The front side 101 is used to form the inner wall surface of the inner pot space. The front side 101 is arranged opposite to the door assembly of the baking cooking device. The hot air unit is arranged adjacent to the rear side 102 of the hot air blower baffle. The fan 50 disturbs the air behind the rear side 102 to form a hot air flow. The hot air flow reaches the inner pot space after passing through the air outlet plate 20 and gradually moves away from the front side 101. After flowing for a distance, the hot air flow turns around under the suction effect of the fan 50 to form a return hot air. The return hot air first gradually approaches the front side 101, and then returns to the rear side 102 of the hot air blower baffle after passing through the return air plate 10.

[0040] See also Figure 1 to Figure 3 The utility model defines the hot air blower baffle as follows: the return air plate 10 includes a centrally arranged air collecting portion 11, that is, the air collecting portion 11 corresponds to the middle part of the return air plate 10, the center of the return air plate 10 is located at the air collecting portion 11, and the rest of the return air plate 10 is located at the outer periphery of the air collecting portion 11. The return air plate 10 has a return air front and a return air back arranged opposite to each other, the air collecting portion 11 includes an air collecting bottom surface 111 and an air collecting back surface 112 arranged opposite to each other, the air outlet plate 20 includes an air outlet front surface 21 and an air outlet back surface 22 arranged opposite to each other, the front side 101 includes the return air front surface and the air outlet front surface 21, the rear side 102 includes the return air back surface and the air outlet back surface 22, the return air front surface includes the air collecting bottom surface 111, and the return air back surface includes the air collecting back surface 112; the return air hole 30 opened in the air collecting portion 11 passes through the air collecting bottom surface 111 and the air collecting back surface 112, and the air outlet hole 40 passes through the air outlet front surface 21 and the air outlet back surface 22. The air collecting bottom surface 111 is concave inwardly toward the rear side 102 relative to the rest of the return air front surface.

[0041] The rest of the return air plate 10 refers to all the other return air plates 10 excluding the air collecting portion 11, and the rest of the return air front refers to all the other return air fronts excluding the air collecting bottom surface 111. The rest of the return air plate 10 and the rest of the return air front shall be subject to this.

[0042] According to the above definition of the hot air blower baffle, the air collecting portion 11 forms a height difference relative to the rest of the return air plate 10, and the air collecting bottom surface 111 and the rest of the return air front surface together form a concave sinking area. The concave sinking area has a temporary collecting and surrounding effect on the return hot air. When the fan 50 rotates, the hot air flow that first passes through the air outlet plate 20 turns around under the suction action of the fan 50 to form return hot air. The return hot air first reaches the concave sinking area. Since there is a height difference between the air collecting portion 11 and the rest of the return air plate 10, it is more difficult for the hot air in the concave sinking area to overflow and diffuse to the rest of the return air plate 10. These hot air will pass through the air collecting portion 11 through the return air hole 30 under the pressure of the return hot air that arrives at the concave sinking area later, and thus flow back to the hot air unit. The return hot air that arrives later will also pass through the air collecting portion 11 later. The return hot air that flows back to the hot air unit will become a new hot air flow after being disturbed by the fan 50 and heated by the heat pipe, thereby realizing the circulation of the hot air flow between the inner tank space and the hot air unit. The concave sinking area increases the proportion of the hot air flow participating in the circulation in the air flow disturbed by the fan 50, thereby increasing the airflow of the circulating hot air. More hot air participating in the circulation can improve the baking cooking efficiency and the uniformity of the cooking of the ingredients.

[0043] Optionally, see Figure 1 The air collecting portion 11 is a circular flat plate structure, the rest of the air return plate 10 is connected to the outer periphery of the air collecting portion 11, and the air outlet plate 20 is a rectangular flat plate structure.

[0044] In some embodiments, the rest of the return air plate 10 includes a resistance reduction portion 12 that is bent and connected between the air collecting portion 11 and the air outlet plate 20. The resistance reduction portion 12 is an annular plate-shaped structure that is connected to the outer periphery of the air collecting portion 11 and extends along the circumference of the air collecting portion 11. The resistance reduction portion 12 includes a resistance reduction slope 121 and a resistance reduction back surface 122 that are arranged opposite to each other. The return air front surface includes the resistance reduction slope 121, and the return air back surface includes the resistance reduction back surface 122. Figure 1-2 The air collecting portion 11 is inclined toward the front of the resistance reducing portion 12, that is, the air collecting portion 11 is inclined relative to the resistance reducing portion 12 in a direction away from the hot air unit and is bent and connected to the inner periphery of the resistance reducing portion 12, and the air outlet plate 20 is inclined toward the rear of the resistance reducing portion 12, that is, the air outlet plate 20 is inclined relative to the resistance reducing portion 12 in a direction close to the hot air unit and is bent and connected to the outer periphery of the resistance reducing portion 12. Figure 2-3The wind collecting portion 11 and the resistance reducing portion 12 together form a concave sinking area for temporarily surrounding and gathering the return hot air.

[0045] Further, see Figure 1 The air collecting part 11 and the resistance reducing part 12 are both provided with a return air hole 30, and the return air hole 30 provided in the resistance reducing part 12 passes through the resistance reducing slope 121 and the resistance reducing back surface 122. The resistance reducing slope 121 is an annular cone surface, and the resistance reducing slope 121 is coaxially arranged with the air collecting part 11. When the hot air blower baffle is assembled with the hot air unit to form a baking cooking device, the rotation axis of the fan 50, the axis of the air collecting part 11 and the axis of the resistance reduction slope 121 are colinear, and the axis of the air collecting part 11 is equivalent to the axis of the entire return air plate 10; the inner periphery of the resistance reduction part 12 is bent and connected to the outer periphery of the air collecting part 11, the inner periphery radius of the resistance reduction part 12 is smaller than the outer periphery radius of the resistance reduction part 12, and the distance between the resistance reduction slope 121 and the axis of the air collecting plate increases in the direction from the rear side 102 to the front side 101, that is, the distance between the resistance reduction slope 121 and the axis of the air collecting plate increases in the direction away from the hot air unit and close to the door assembly. In this way, when the return hot air flows along the resistance reduction slope 121, it can have a velocity vector flowing along the axis of the air collecting part 11 to approach the hot air unit, thereby increasing the kinetic energy of the return hot air passing through the air collecting part 11 and reducing the kinetic energy reduction of the return hot air by the return air plate 10.

[0046] Furthermore, in some embodiments, the outer periphery of the resistance reduction portion 12 is the outer periphery of the air return plate 10, and the air outlet plate 20 is connected to the outer periphery of the resistance reduction portion 12. Figure 1 , the outer peripheral diameter of the wind collecting part 11 is D1, and the outer peripheral diameter of the resistance reducing part 12 is D2, and the relationship between the two is 0.45≤D1 / D2≤0.65. In this way, the size relationship between the wind collecting part 11 and the resistance reducing part 12 is reasonably configured. In addition to guiding the return hot air to gather in the concave sinking area, the resistance reducing part 12 can also make the wind beam of the return hot air close to the axis of the wind collecting part 11, so that the return hot air and the hot air flow blown out of the air outlet will not collide and interfere with each other.

[0047] Optionally, the bending angle between the air outlet plate 20 and the resistance reduction portion 12 is not less than 7° and not more than 15°, and the bending angle between the air collecting portion 11 and the resistance reduction portion 12 is not less than 7° and not more than 15°. Figure 2 In the illustrated embodiment, the bending angle between the air outlet plate 20 and the resistance reduction portion 12 is 6°, and the bending angle between the air collecting portion 11 and the resistance reduction portion 12 is 6°. With such an arrangement, the shape and structure of the hot air blower baffle are reasonable, and while ensuring the guiding and surrounding effect of the resistance reduction portion 12 on the return hot air, the total thickness of the hot air blower baffle in the axial direction of the air collecting portion 11 is controlled within a certain range.

[0048] Optionally, see Figure 2-3The resistance reduction portion 12 and the air collecting portion 11, as well as the resistance reduction portion 12 and the air outlet plate 20 are all integrally formed. The air collecting portion 11, the resistance reduction portion 12 and the air outlet plate 20 are made of a plate-like member by stamping, and the air outlet hole 40 and the return air hole 30 are obtained together with the stamping of the air collecting portion 11, the resistance reduction portion 12 and the air outlet plate 20.

[0049] Optionally, see Figure 2 The air collecting back 112 and the air outlet back 22 are two planes arranged in layers, and the plane where the air collecting back 112 is located is parallel to the plane where the air outlet back 22 is located. In particular, in some embodiments, the distance between the plane where the air collecting back 112 is located and the plane where the air outlet back 22 is located is limited to be not less than 5 mm and not more than 7 mm. With such arrangement, the amount of concave sinking of the air collecting portion 11 relative to the air outlet plate 20 is reasonable. When the fan 50 is arranged at the rear side 102 of the hot air blower baffle, the spoiler 52 of the fan 50 will not scrape the rear side 102 of the hot air blower baffle when disturbing the air, and the fan 50 can be brought close to the hot air blower baffle to the greatest extent, which is conducive to making the overall structure of the baking and cooking device more compact and the internal space utilization rate higher.

[0050] Optionally, see Figure 1-2 The air collecting part 11 is also provided with a avoidance through hole 113 in the center, and the avoidance through hole 113 corresponds to the middle part of the air collecting part 11, and the axis of the air collecting part 11 passes through the avoidance through hole 113, and the avoidance through hole 113 passes through the air collecting bottom surface 111 and the air collecting back surface 112 of the air collecting part 11. In order to make the spoiler 52 of the fan 50 closer to the rear side 102 of the hot air blower baffle, so that the fan 50 can more fully and efficiently suck the return hot air, the main body 51 of the fan 50 is allowed to extend into the avoidance through hole 113, and the spoiler 52 can rotate normally without scratching the hot air blower baffle. In this way, most of the air sucked by the fan 50 is return hot air, which can increase the airflow of the circulating hot air. The closer the spoiler 52 is to the rear side 102 of the hot air blower baffle, the larger the proportion of return hot air sucked by the fan 50.

[0051] See also Figure 1 and Figure 3 In some embodiments, the structure of the hot air blower baffle is further defined as follows: the outer peripheral diameter of the return air plate 10 is D3, the distance from the end of the spoiler 52 to the axis of the main body 51 is R4, and 2.2≤D3 / R4≤2.6. Specifically, if the hot air blower baffle is observed in a line of sight parallel to the axis of the air collecting part 11, the area on the return air plate 10 where the return air hole 30 is opened is a circular area, and the outer peripheral diameter of the return air plate 10 is the diameter of the circular area where the return air hole 30 is opened, and the end of the spoiler 52 is the end of the spoiler 52 that is relatively far away from the axis of the main body 51, that is, Figure 3The spoiler distal end 521 is shown. With such a configuration, the specifications of the fan 50 match the hot air blower baffle, and the return air plate 10 corresponds to the low-pressure area formed when the fan 50 rotates along the axis of the wind collecting portion 11, thereby ensuring that the hot air flow flows stably and sufficiently in the inner tank space, and maximizing the share of the hot air flow participating in the circulation.

[0052] Further, see Figure 1 and Figure 3 The outer peripheral diameter of the resistance reduction portion 12 is D2, the distance from the end of the spoiler 52 close to the axis of the main body 51 to the axis of the main body 51 is R5, 2.4≤D2 / R5≤3, and the end of the spoiler 52 close to the axis of the main body 51 is Figure 3 The proximal end 522 of the spoiler is shown. When the fan 50 rotates, the low-pressure area formed by the fan 50 is roughly a cylindrical space area, and the axis of the low-pressure area is basically coincident with the axis of the main body 51 and the air collecting part 11, that is, one end of the spoiler 52 close to the axis of the main body 51 is basically located on the outer peripheral side of the low-pressure area. In this way, the return hot air passing through the air collecting part 11 can be sufficiently sucked into the low-pressure area, and at least a part of the return hot air passing through the resistance reduction part 12 can also be sucked into the low-pressure area, which is conducive to increasing the airflow of the hot air airflow circulating between the inner tank space and the hot air unit, and because the return hot air passing through the resistance reduction part 12 has a larger velocity vector in the axial direction of the air collecting part 11, the return speed of the return hot air in the axial direction of the air collecting part 11 can be increased to a certain extent, thereby accelerating the circulation of the hot air airflow between the inner tank space and the hot air unit, which helps to improve the efficiency of baking food.

[0053] It can be understood that D3≥D2. When the return air plate 10 is composed of only the air collecting portion 11 and the resistance reducing portion 12, the outer periphery of the resistance reducing portion 12 is the outer periphery of the return air plate 10. At this time, D3=D2.

[0054] The hot air blower baffle of the utility model can be used for baking cooking equipment with microwave cooking function. Generally, the hot air blower baffle used in the baking cooking equipment with microwave cooking function is provided with very small return air holes and air outlet holes. Smaller return air holes and air outlet holes can reduce microwave leakage, but are not conducive to the circulation of hot air flow between the inner tank space and the hot air unit, and the efficiency of baking food and the smoothness of the flow of hot air flow are greatly affected. The hot air blower baffle of the utility model improves the situation that the circulation of hot air flow is insufficient due to the overflow of the return hot air along the front side and the difficulty of passing through the return air plate, and promotes the return hot air that arrives at the concave sinking area later to push the return hot air that arrives at the concave sinking area first to quickly pass through the return air plate, and at least part of the return hot air is returned to the hot air unit along the axial direction of the air collecting part. The speed of the hot air flow between the inner tank space and the hot air unit is improved, and the smoothness of the hot air flow circulation is improved accordingly.

[0055] When the hot air blower baffle is used for a baking cooking device with a microwave cooking function, the apertures of the air outlet and the air return holes range from 2 to 4 mm.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection required by the present invention.

Claims

1. A hot air blower baffle, characterized in that: The invention comprises an air return plate (10) and an air outlet plate (20) connected to the outer periphery of the air return plate (10), and has a front side (101) and a rear side (102) arranged opposite to each other, the air outlet plate (20) is provided with an air outlet hole (40) to pass through the front side (101) and the rear side (102), and the air return plate (10) is provided with an air return hole (30) to pass through the front side (101) and the rear side (102); the air return plate (10) comprises an air collecting portion (11) arranged in the center and provided with at least part of the air return hole (30), and one side of the air collecting portion (11) forming the front side (101) is concave toward the rear side (102).

2. The hot air blower baffle according to claim 1, characterized in that: The air return plate (10) further comprises a resistance reducing portion (12) bent and connected between the air collecting portion (11) and the air outlet plate (20), and the air collecting portion (11) and the air outlet plate (20) are respectively inclined towards the front and rear sides of the resistance reducing portion (12).

3. The hot air blower baffle according to claim 2, characterized in that: The air collecting portion (11) and the resistance reducing portion (12) are both provided with the air return hole (30); and / or, The resistance reduction portion (12) extends along the circumferential direction of the wind collecting portion (11) and has an annular conical surface coaxial with the wind collecting portion (11), and the annular conical surface forms a portion of the front side (101).

4. The hot air blower baffle according to claim 3, characterized in that: The distance between the annular conical surface and the axis of the air return plate (10) increases from the rear side (102) to the front side (101); and / or, The diameter of the outer periphery of the wind collecting portion (11) is D1, the diameter of the outer periphery of the resistance reducing portion (12) is D2, and 0.45≤D1 / D2≤0.

65.

5. The hot air blower baffle according to claim 2, characterized in that: The resistance reducing portion (12) and the air collecting portion (11) are integrally formed; and / or, The resistance reduction portion (12) and the air outlet plate (20) are integrally formed; and / or, The outer periphery of the resistance reduction portion (12) forms the outer periphery of the return air plate (10).

6. The hot air blower baffle according to claim 2, characterized in that: The bending angle between the air outlet plate (20) and the resistance reduction portion (12) is not less than 7° and not greater than 15°; and / or the bending angle between the air collecting portion (11) and the resistance reduction portion (12) is not less than 7° and not greater than 15°.

7. The hot air blower baffle according to any one of claims 1 to 6, characterized in that: The rear side (102) comprises a layered air collecting back side (112) and an air outlet back side (22); the air collecting back side (112) is the side of the air collecting portion (11) facing away from the front side (101); the air outlet back side (22) is the side of the air outlet plate (20) facing away from the front side (101); and the surface distance between the air collecting back side (112) and the air outlet back side (22) is not less than 5 mm and not more than 7 mm.

8. The hot air blower baffle according to any one of claims 1 to 6, characterized in that: The wind collecting portion (11) is also provided with a centrally disposed avoidance through hole (113), the avoidance through hole (113) passing through the front and rear sides of the wind collecting portion (11), and the avoidance through hole (113) is used to enable the wind collecting portion (11) to avoid the main body (51) of the fan (50).

9. A baking and cooking device, characterized in that: It comprises a fan (50) and the hot air blower baffle according to any one of claims 1 to 8, wherein the fan (50) is rotatably arranged behind the rear side (102).

10. The baking cooking device according to claim 9, characterized in that: The fan (50) comprises a main body (51) coaxial with the air collecting portion (11), and also comprises a plurality of spoiler portions (52) arranged on the outer peripheral side of the main body (51), wherein: The outer peripheral diameter of the return air plate (10) is D3, the distance from the end of the spoiler (52) to the axis of the main body (51) is R4, 2.2≤D3 / R4≤2.6; and / or, The air return plate (10) further comprises a resistance reducing portion (12) bent and connected between the air collecting portion (11) and the air outlet plate (20); the air collecting portion (11) and the air outlet plate (20) are respectively inclined toward the front and rear sides of the resistance reducing portion (12); the outer peripheral diameter of the resistance reducing portion (12) is D2; the distance from one end of the spoiler (52) close to the axis of the main body (51) to the axis of the main body (51) is R5, and 2.4≤D2 / R5≤3.

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