Air heater baffle and baking cooking equipment

Abstract

The utility model provides a hot-air blower baffle and baking cooking equipment, the hot-air blower baffle comprises a fixed part, a ventilation plate provided with an air return hole and a front air outlet hole, and a connecting plate provided with an inclined air outlet hole, the connecting plate is of a closed-loop structure with taper, and comprises a narrowing end edge and a broadening end edge which are respectively positioned at two ends of the closed-loop structure, the edge of the narrowing end is connected with the peripheral edge of the ventilation plate, and the edge of the widening end is connected with the fixing part. According to the air heater baffle, the air volume proportion of hot air flow entering the inner container cavity can be increased, and therefore food materials can be better heated.

Description

Technical Field

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

[0002] Baking cooking devices such as ovens and steam ovens are equipped with a hot air unit and a hot air blower baffle, and the hot air unit generates a circulating hot air flow to heat and cook food materials. The hot air blower baffle generally includes a ventilation plate and a side enclosure plate. The two sides of the ventilation plate are respectively the hot air unit and the inner container cavity. The side enclosure plate extends along the outer peripheral edge of the ventilation plate to form a closed-loop structure and is bent and connected to the outer peripheral edge of the ventilation plate. The hot air flow first flows out from the hot air unit, and then passes through the ventilation plate to enter the inner container cavity where the food materials are placed.

[0003] Existing baking cooking devices face a problem: when the hot air flow passes through the ventilation plate, there is momentum loss and air volume loss. A considerable part of the hot air flow does not blow into the inner container cavity but passes through the side enclosure plate. This part of the hot air flow has a velocity vector away from the inner container cavity, resulting in insufficient air volume of the hot air flow blown into the inner container cavity. However, it is indispensable to open side air outlet holes in the side enclosure plate for part of the hot air flow to pass through. Otherwise, more and more hot air flow accumulates on the side of the ventilation plate away from the inner container cavity, causing air flow disorder in the area near the hot air unit, and seriously interfering with the continuous generation of the hot air flow in severe cases. Summary of the Utility Model

[0004] In view of this, the utility model provides a hot air blower baffle and a baking cooking device, aiming to increase the proportion of the air volume of the hot air flow entering the inner container cavity so as to better heat the food materials.

[0005] The hot air blower baffle of the utility model includes a fixing part, a ventilation plate provided with a return air hole and a direct air outlet hole, and a connecting plate provided with an inclined air outlet hole. The connecting plate is a closed-loop structure with a taper, and includes a narrowing end edge and a widening end edge respectively located at both ends of the closed-loop structure. The narrowing end edge is connected to the outer peripheral edge of the ventilation plate, and the widening end edge is connected to the fixing part.

[0006] The beneficial effects of the hot air blower baffle and the baking cooking device of the utility model include:

[0007] 1) Part of the hot air flow generated by the hot air unit passes through the ventilation plate through the direct air outlet hole to blow into the inner container cavity. In addition, part of the hot air flow passes through the connecting plate through the inclined air outlet hole. The hot air flow passing through the connecting plate has a velocity vector flowing towards the inner container cavity. Therefore, the hot air flow passing through the connecting plate can also blow into the inner container cavity, thereby increasing the proportion of the hot air flow entering the inner container cavity in all the hot air flow;

[0008] 2) The taper of the connecting plate makes the connecting plate tilted and bent relative to the ventilation plate, thereby alleviating the structural stress and thermal stress near the edge of the narrowed end. The edge of the narrowed end is not easily damaged or cracked by being blown by high-temperature gas for a long time, which effectively ensures the structural reliability of the hot air blower baffle;

[0009] 3) The connecting plate with a closed-loop structure can guide the hot air flow blowing toward the local part of the connecting plate. The hot air flow guided by the connecting plate will flow along the outer peripheral edge of the ventilation plate until it reaches the oblique air outlet hole suitable for the hot air flow to be blown out. Therefore, the hot air flow can be prevented from accumulating on the side of the hot air blower baffle away from the inner tank cavity, thereby eliminating the probability of turbulence on the side of the hot air blower baffle away from the inner tank cavity due to poor hot air discharge, ensuring that the hot air unit can continuously and sufficiently generate hot air flow;

[0010] 4) The hot air flow passing through the connecting plate not only has a first velocity vector flowing toward the inner pot cavity, but also has a second velocity vector flowing in a direction parallel to the ventilation plate. The second velocity vector enables the hot air flow passing through the connecting plate to flow toward the inner wall surface of the inner pot cavity. Subsequently, this part of the hot air flow will flow along the inner wall surface of the inner pot cavity by virtue of the wall attachment effect (i.e., the Coanda effect), thereby helping to form an embracing hot air flow field surrounding the food. The embracing hot air flow field can ensure that all parts of the food are fully heated and cooked.

[0011] In some embodiments, a figure of the oblique air outlet holes projected onto a parallel surface of the air-permeable plate is a closed figure.

[0012] In some embodiments, the closed figure includes a strip-shaped closed figure, the positive air outlet includes a strip-shaped positive air outlet, and at least part of the strip-shaped closed figure and at least part of the strip-shaped positive air outlet have the same extension direction.

[0013] In some embodiments, the peripheral edge of the ventilation plate includes a first side edge, a top edge, a second side edge, and a bottom edge which are sequentially arranged and connected by chamfered edges, and the connecting plate includes a first inclined plate, a second inclined plate, a third inclined plate, and a fourth inclined plate which are sequentially arranged along the peripheral edge of the ventilation plate and connected by chamfered inclined plates.

[0014] The first inclined plate is bent and connected to the first side edge, the second inclined plate is bent and connected to the top edge, the third inclined plate is bent and connected to the second side edge, the fourth inclined plate is bent and connected to the bottom edge, and the chamfered inclined plates are bent and connected to the chamfered edges in a one-to-one correspondence.

[0015] In some embodiments, at least part of the oblique air outlet holes are provided on the chamfered oblique plate; and / or,

[0016] At least one of the first inclined plate, the second inclined plate, the third inclined plate and the fourth inclined plate is provided with an inclined air outlet hole.

[0017] In some embodiments, the first side and the second side are equal in length and parallel, and the distance between them is W;

[0018] The top and bottom sides are equal in length and parallel, and the distance between them is H;

[0019] The chamfered edge includes a first chamfered edge located between the first side edge and the top edge, the length of the first chamfered edge is L, and the angle between the first chamfered edge and the top edge is β, wherein:

[0020] 110°≤β≤150°; and / or, 0.15H≤L≤0.4H; and / or, arctan(H / W)-20°≤β≤arctan(H / W)+20°.

[0021] In some embodiments, the hot air blower baffle further includes a side panel having side air outlets, the side panel is a closed-loop structure, and the fixing portion and the widened end edge are respectively connected to two ends of the side panel.

[0022] In some embodiments, the angle between the connecting plate and the ventilation plate is α, and in the orientation perpendicular to the ventilation plate, the distance from the widened end edge to the ventilation plate is d1, and the distance from the fixing portion to the widened end edge is d2, d2≤d1 / sinα.

[0023] In some embodiments, 0.25(d1+d2)≤d2≤d1 / sinα≤0.75(d1+d2); and / or, 30°≤α≤70°.

[0024] The baking and cooking equipment provided by the utility model comprises a hot air blower baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a hot air blower baffle in a first viewing angle according to an embodiment of the utility model;

[0026] Figure 2 This is a schematic structural diagram of a hot air blower baffle in a second viewing angle according to an embodiment of the utility model;

[0027] Figure 3 This is a schematic structural diagram of a hot air blower baffle in a third viewing angle according to an embodiment of the utility model;

[0028] Figure 4 for Figure 3 The cross-sectional view of the hot air blower baffle shown is obtained by cutting along the AA plane.

[0029] Reference numerals: 10, fixing part; 11, fastening hole; 20, ventilation plate; 201, first side edge; 202, top edge; 203, second side edge; 204, bottom edge; 205, first chamfered edge; 206, second chamfered edge; 207, third chamfered edge; 208, fourth chamfered edge; 21, return air hole; 22, direct air outlet hole; 30, connecting plate; 301, first inclined plate; 302, second inclined plate; 303, third inclined plate; 304, fourth inclined plate; 305, first chamfered inclined plate; 306, second chamfered inclined plate; 307, third chamfered inclined plate; 308, fourth chamfered inclined plate; 31, narrow end edge; 32, widened end edge; 33, inclined air outlet hole; 40, side wall panel; 41, side air outlet hole. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with 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 embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this specification are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0032] The present utility model provides a hot air blower baffle and a baking and cooking device including the hot air blower baffle. The baking and cooking device can be a microwave oven, a steam oven, etc. The baking and cooking device further includes a hot air unit, an inner container assembly and a door panel. The hot air unit is arranged on one side of the hot air blower baffle and is used to generate a hot air flow. The inner container assembly is arranged on the other side of the hot air blower baffle and has an inner container cavity for placing food materials. The door panel is used to close the inner container cavity. When the door panel closes the inner container cavity, the door panel and the hot air blower baffle are arranged opposite to each other, and the inner container cavity is formed between the door panel and the hot air blower baffle.

[0033] When the baking and cooking device heats the food materials, the hot air flow generated by the hot air unit passes through the hot air blower baffle and then enters the inner container cavity. Then the hot air flow flows towards the door panel, approaches and heats the food materials. Then the hot air flow turns around and becomes a return air flow flowing back towards the hot air blower baffle. The return air flow passes through the hot air blower baffle and reaches the hot air unit, and then is re-disturbed and heated by the hot air unit to form a hot air flow again. Thus, the cyclic flow of the hot air flow between the hot air unit and the inner container cavity is realized.

[0034] Refer to Figures 1 to 2 , the hot air blower baffle includes a fixing part 10 and a ventilation plate 20. The ventilation plate 20 includes a front side and a rear side arranged opposite to each other, and is provided with a return air hole 21 and a direct air outlet hole 22 that penetrate through the front side and the rear side. The baking and cooking device further includes a back plate. The fixing part 10 is located behind the rear side and fixedly connects the back plate and the ventilation plate 20. The hot air unit is arranged between the back plate and the rear side and includes a fan and a heating element. The heating element includes a heat pipe that surrounds the outer peripheral side of the fan along the circumference of the fan. The inner container cavity is adjacent to the front side. The return air hole 21 and the direct air outlet hole 22 communicate with the inner container cavity, and the return air hole 21 and the direct air outlet hole 22 also communicate with the space between the back plate and the rear side. When the door closes the inner container cavity, the front side is arranged opposite to the door. A part of the hot air flow passes through the ventilation plate 20 from the direct air outlet hole 22 and enters the inner container cavity, and the return air flow passes through the ventilation plate 20 from the return air hole 21 and enters the space between the rear side and the back plate, and then is respectively re-disturbed and re-heated by the fan and the heating element to form a hot air flow again.

[0035] When the fan rotates, air is thrown out of the fan along the radial direction of the fan, and the rotation axis of the fan is configured to be perpendicular to the ventilation plate 20. Therefore, the initial velocity direction of the hot air flow when it just leaves the hot air unit is approximately parallel to the ventilation plate 20. To prevent the hot air flow from accumulating more and more in the space between the rear side and the back plate, and to prevent the accumulated hot air flow from being difficult to discharge from the space between the rear side and the back plate, generally, the hot air blower baffle further includes a side enclosure plate 40 provided with a side air outlet hole 41. As Figures 1 to 2 shown, the side enclosure plate 40 is located behind the rear side and extends along the outer peripheral edge of the ventilation plate 20. The fixing part 10 and the ventilation plate 20 are respectively connected to both ends of the side enclosure plate 40. The space between the rear side and the back plate communicates with the side air outlet hole 41. The setting of the side air outlet hole 41 is necessary. The side air outlet hole 41 allows a part of the hot air flow to pass through the side enclosure plate 40 and leave the space between the rear side and the back plate.

[0036] Optionally, the fixing part 10 is bent and connected to the side enclosure plate 40, and the fixing part 10 is a flat plate-like structure parallel to the ventilation plate 20. The fixing part 10 is provided with fastening holes 11 for fasteners such as bolts to pass through. With such a setting, the fixing part 10 can be fitted and connected to the back plate, and allows the fasteners to penetrate through the fastening holes 11 to fix the back plate and the fixing part 10.

[0037] The existence of the side air outlet hole 41 causes the hot air flow blown out from the side air outlet hole 41 to inevitably have a velocity vector away from the inner container cavity. In other words, it is almost impossible for the hot air flow blown out from the side air outlet hole 41 to enter the inner container cavity. Therefore, the proportion of the hot air flow (hereinafter simply referred to as the effective hot air flow) that can enter the inner container cavity and be used to heat the food materials is relatively low. The insufficient air volume of the effective hot air flow results in insufficient and uneven heating of the food materials, affecting the cooking efficiency and the taste after cooking. For the existing hot air blower baffle and baking cooking equipment, the vast majority of the effective hot air flow is blown into the inner container cavity through the front air outlet hole 22.

[0038] In view of this, the hot air blower baffle of the present utility model further includes an adapter plate 30 provided with an inclined air outlet hole 33. Refer to Figures 1 to 4 , the adapter plate 30 is a closed-loop structure with a taper and extends along the outer peripheral edge of the air-permeable plate 20. The adapter plate 30 includes a narrowing end and a widening end located at both ends of the closed-loop structure respectively. Therefore, the adapter plate 30 has a narrowing end edge 31 formed on the outer peripheral edge of the narrowing end and a widening end edge 32 formed on the outer peripheral edge of the widening end. The narrowing end edge 31 matches and is fixedly connected to the outer peripheral edge of the air-permeable plate 20, and the widening end edge 32 is fixedly connected to the fixing portion 10. If the narrowing end edge 31 is orthogonally projected onto a plane parallel to the air-permeable plate 20 and the projection contour of the narrowing end edge 31 is denoted as the first projection contour, and the projection contour of the widening end edge 32 orthogonally projected onto this plane is denoted as the second projection contour, then the first projection contour is entirely located inside the second projection contour; if the adapter plate 30 is sectioned with a plane parallel to the air-permeable plate 20 as the sectioning plane, then as this sectioning plane gradually moves away from the air-permeable plate 20 and gradually approaches the fixing portion 10, the section contour of the adapter plate 30 cut by this sectioning plane gradually expands.

[0039] If the hot air flow blown into the inner container cavity from the front air outlet hole 22, the hot air flow blown into the inner container cavity from the inclined air outlet hole 33, and the hot air flow blown out from the side air outlet hole 41 are respectively defined as the forward hot air flow, the inclined hot air flow, and the lateral hot air flow, then both the forward hot air flow and the inclined hot air flow can be blown into the inner container cavity to heat the food materials so as to form an effective hot air flow, while the lateral hot air flow hardly blows into the inner container cavity. Therefore, the lateral hot air flow can also be called an ineffective hot air flow. The reason why the inclined hot air flow can blow into the inner container cavity is that the inclined hot air flow has a first velocity vector flowing towards the inner container cavity.

[0040] The baffle of the hot air blower of the present utility model is provided with an adapter plate 30 and an inclined air outlet hole 33, so that the sources of the effective hot air flow are more diverse. The air that was originally the lateral hot air flow blows out from the inclined air outlet hole 33 and thus becomes an inclined hot air flow. Therefore, the generation of the inclined hot air flow reduces the air volume and wind speed of the lateral hot air flow, thereby increasing the air volume of the effective hot air flow and increasing the proportion of the effective hot air flow in all the hot air flows. In addition, the inclined hot air flow also has a second velocity vector flowing in a direction parallel to the air permeable plate 20. The second velocity vector enables the inclined hot air flow to flow close to the inner wall surface of the inner tank cavity. Subsequently, the inclined hot air flow flows along the inner wall surface of the inner tank cavity by virtue of the wall attachment effect, thereby forming an encircling hot air flow field that fully surrounds the food materials. The space volume surrounded by the encircling hot air flow field matches the space volume of the inner tank cavity, ensuring that all parts of the food materials are heated evenly and sufficiently.

[0041] In some embodiments, the orthographic projection of the inclined air outlet hole 33 on the plane parallel to the air permeable plate 20 is a closed figure. The plane parallel to the air permeable plate 20 is parallel to the air permeable plate 20. A closed figure refers to a two-dimensional planar figure with a certain area. If the baffle of the hot air blower is observed in the line-of-sight direction perpendicular to the air permeable plate 20, as Figure 3 shown, then all the observed inclined air outlet holes 33 are closed figures, rather than line segments or points. With such a setting, the hot air flow blows from the inclined air outlet hole 33 into the inner tank cavity more smoothly, with less resistance and kinetic energy loss.

[0042] Specifically, referring to Figure 1 and Figure 4 , one end of the side enclosure plate 40 relatively far from the fixing part 10 matches and is fixedly connected to the widened end edge 32. Figure 3 The middle cross-section A-A is perpendicular to the air permeable plate 20. Therefore, the air permeable plate 20, the adapter plate 30, the side enclosure plate 40 and the fixing part 10 are sequentially stacked in a direction perpendicular to the air permeable plate 20.

[0043] In some embodiments, referring to Figure 1 , Figures 3 to 4 , the adapter plate 30 is a frustum-shaped closed-loop structure. The included angle between the adapter plate 30 and the air permeable plate 20 is α. In the orientation perpendicular to the air permeable plate 20, the distance from the widened end edge 32 to the air permeable plate 20 is d1, the distance from the fixing part 10 to the widened end edge 32 is d2, and the distance from the fixing part 10 to the air permeable plate 20 is d. d = d1 + d2, and d2 ≤ d1 / sinα.

[0044] With such a setting, the effect of reducing the air volume and wind speed of the lateral hot air flow is ensured, the generation amount of ineffective hot air flow is reduced, and more hot air flow is promoted to enter the inner tank cavity.

[0045] Further, 0.25(d1 + d2) ≤ d2 ≤ d1 / sinα ≤ 0.75(d1 + d2). With such a setting, it is ensured that the side wall panel 40 has sufficient height in the orientation perpendicular to the ventilation panel 20, so as to ensure that the opening size of the side air outlet 41 is appropriate, avoid the side air outlet 41 being too narrow and causing difficulty in discharging the lateral hot air flow, and prevent the hot air flow from accumulating between the rear side and the back panel to generate turbulence.

[0046] Further, 30° ≤ α ≤ 70°. With such a setting, the area size of the ventilation panel 20 and the area size of the connection panel 30 are taken into account, and the magnitude relationship between the first velocity vector and the second velocity vector is taken into account, so as to take into account the inward flow of the oblique hot air flow into the inner tank cavity and the inner wall of the inner tank cavity. When α = 45°, the first velocity vector and the second velocity vector of the oblique hot air flow are equal.

[0047] Refer to Figures 1 to 3 , the front air outlet 22 includes a strip-shaped front air outlet 22. If the hot air blower baffle is observed in the line-of-sight direction perpendicular to the ventilation panel 20, then the opening shape of at least a part of the oblique air outlets 33 is a strip-shaped closed figure, the opening shape of the strip-shaped front air outlet 22 is strip-shaped, and the extending direction of at least a part of the strip-shaped front air outlets 22 is the same as the extending direction of at least a part of the oblique air outlets 33.

[0048] Specifically, as Figures 1 to 2 shown, the outer peripheral edge of the ventilation panel 20 is octagonal, including a first side 201, a top side 202, a second side 203 and a bottom side 204 arranged in sequence. In addition, it also includes a first chamfered side 205, a second chamfered side 206, a third chamfered side 207 and a fourth chamfered side 208 arranged in sequence. The two ends of the first chamfered side 205 are respectively connected to the first side 201 and the top side 202, the two ends of the second chamfered side 206 are respectively connected to the top side 202 and the second side 203, the two ends of the third chamfered side 207 are respectively connected to the second side 203 and the bottom side 204, the two ends of the fourth chamfered side 208 are respectively connected to the bottom side 204 and the first side 201. The front air outlet 22 includes two groups of strip-shaped front air outlets 22. The extending direction of the first group of strip-shaped front air outlets 22 is parallel to the top side 202, and the extending direction of the second group of strip-shaped front air outlets 22 is parallel to the bottom side 204.

[0049] Refer to again Figures 1 to 2, the connection plate 30 includes a first inclined plate 301, a first chamfered inclined plate 305, a second inclined plate 302, a second chamfered inclined plate 306, a third inclined plate 303, a third chamfered inclined plate 307, a fourth inclined plate 304, and a fourth chamfered inclined plate 308 that are sequentially arranged along the outer peripheral edge of the ventilation plate 20. The first inclined plate 301 is bent and connected to the first side edge 201, the first chamfered inclined plate 305 is bent and connected to the first chamfered edge 205, the second inclined plate 302 is bent and connected to the top edge 202, the second chamfered inclined plate 306 is bent and connected to the second chamfered edge 206, the third inclined plate 303 is bent and connected to the second side edge 203, the third chamfered inclined plate 307 is bent and connected to the third chamfered edge 207, the fourth inclined plate 304 is bent and connected to the bottom edge 204, and the fourth chamfered inclined plate 308 is bent and connected to the fourth chamfered edge 208. The first inclined plate 301, the first chamfered inclined plate 305, the second inclined plate 302, and the fourth inclined plate 304 are all provided with strip-shaped inclined air outlets 33. The strip-shaped inclined air outlet 33 provided on the first inclined plate 301 is parallel to the first side edge 201, the strip-shaped inclined air outlet 33 provided on the first chamfered inclined plate 305 is parallel to the first chamfered edge 205, the strip-shaped inclined air outlet 33 provided on the second inclined plate 302 is parallel to the first group of strip-shaped positive air outlets 22, and the strip-shaped inclined air outlet 33 provided on the fourth inclined plate 304 is parallel to the second group of strip-shaped positive air outlets 22.

[0050] With such a setting, the oblique hot air flow passing through the second inclined plate 302 and the positive hot air flow blown out from the first group of strip-shaped positive air outlets 22 have approximately the same flow direction after entering the inner tank cavity. The two complement each other and do not interfere with each other; the oblique hot air flow passing through the fourth inclined plate 304 and the positive hot air flow blown out from the second group of strip-shaped positive air outlets 22 have approximately the same flow direction after entering the inner tank cavity. The two complement each other and do not interfere with each other. In addition, the oblique hot air flow passing through the first chamfered inclined plate 305 serves as a supplement to the positive hot air flow blown out from the first group of strip-shaped positive air outlets 22, further improving the heating efficiency of the food materials. At the same time, the oblique hot air flow passing through the first chamfered inclined plate 305 can prevent the food materials from being directly blown and causing local charring of the food materials.

[0051] It should be noted that the opening positions of the inclined air outlets 33 on the connection plate 30 are diverse. The above-described embodiment is only a specific description of Figures 1 to 3 the structure of the hot air blower baffle shown, rather than a specific limitation on the opening positions of the inclined air outlets 33. In other embodiments, the first chamfered inclined plate 305 may not be provided with an inclined air outlet 33, and it is only necessary to provide an inclined air outlet 33 on any one or more of the first inclined plate 301, the second inclined plate 302, the third inclined plate 303, and the fourth inclined plate 304. In addition, any one or more of the second chamfered inclined plate 306, the third chamfered inclined plate 307, and the fourth chamfered inclined plate 308 may also be provided with an inclined air outlet 33.

[0052] Figures 1 to 3 The hot air blower baffle shown is suitable for being used in combination with a fan that rotates clockwise in the forward direction. The first set of strip-shaped positive air outlets 22 are located at Figure 3 the upper left corner area of the middle air-permeable plate 20, and the second set of strip-shaped positive air outlets 22 are located at Figure 3 the lower right corner area of the middle air-permeable plate 20. The fan rotating clockwise in the forward direction specifically means that: if observing the hot air blower baffle in the line-of-sight direction perpendicular to the air-permeable plate 20, as Figure 3 shown, then the fan will rotate clockwise, and the rotation center of the fan is perpendicular to the air-permeable plate 20. In this case, the three oblique hot air flows passing through the first inclined plate 301, the first chamfered inclined plate 305, and the second inclined plate 302 and the multiple positive hot air flows blown out from the first set of strip-shaped positive air outlets 22 have a clockwise rotation velocity vector and can flow and diffuse to the right together; the one oblique hot air flow passing through the fourth inclined plate 304 and the multiple positive hot air flows blown out from the second set of strip-shaped positive air outlets 22 have a clockwise rotation velocity vector and can flow and diffuse to the left together.

[0053] It should be noted that when the fan rotating clockwise in the forward direction is used in combination with the Figures 1 to 3 hot air blower baffle shown, when the fan rotates, the fan first generates a hot air flow in the space between the rear side and the back plate. The pressure of the hot air flow received by the first chamfered inclined plate 305 is significantly greater than the air flow pressures received by the second chamfered inclined plate 306, the third chamfered inclined plate 307, and the fourth chamfered inclined plate 308. Most of the hot air flow generated between the rear side and the back plate will pass through the first inclined plate 301, the first chamfered inclined plate 305, the second inclined plate 302, and the upper left corner area of the air-permeable plate 20 and then enter the inner tank cavity, and a small amount of hot air flow will pass through the fourth inclined plate 304, the lower right corner area of the air-permeable plate 20, and the lower left corner area of the air-permeable plate 20 and then enter the inner tank cavity.

[0054] Furthermore, referring to Figure 3 , the length of the first side 201 is equal to and parallel to the second side 203, and the distance between the two is W; the length of the top side 202 is equal to and parallel to the bottom side 204, and the distance between the two is H. The first side 201 is perpendicular to the top side 202 and the bottom side 204, and the second side 203 is perpendicular to the top side 202 and the bottom side 204. The length of the first chamfered side 205 is L, and the included angle between the first chamfered side 205 and the top side 202 is β. If the oblique air outlet 33 opened on the first chamfered inclined plate 305 is cancelled, then it is necessary to satisfy the following conditions:

[0055] The value range of β is 110° ≤ β ≤ 150°;

[0056] The relationship between H and L is 0.15H ≤ L ≤ 0.4H;

[0057] The relationship among H, W, and β is arctan(H / W) - 20° ≤ β ≤ arctan(H / W) + 20°.

[0058] With such a setting, the first chamfered sloping plate 305 can play an active guiding role in the hot air flow between the rear side and the back plate. Since the fan also imparts a rotational velocity vector to the hot air flow, under the combined action of the rotational velocity vector of the hot air flow and the first chamfered sloping plate 305, the hot air flow reaching the side of the first chamfered sloping plate 305 close to the back plate will be guided to the side of the second sloping plate 302 close to the back plate. Subsequently, these hot air flows will be blown out from the strip-shaped inclined air outlet holes 33 formed in the second sloping plate 302, avoiding the accumulation of hot air flows between the rear side and the back plate due to the inappropriate size of the first chamfered sloping plate 305, thereby reducing the possibility of turbulence generation in this area and ensuring that the hot air flow is discharged from between the rear side and the back plate in a timely manner to enter the inner container cavity.

[0059] Compared with the prior art, the hot air blower baffle of the present utility model allows a part of the hot air flow to flow along the outer peripheral edge of the air-permeable plate 20 until this part of the hot air flow reaches the inclined air outlet holes 33 suitable for blowing out and then leaves the space between the rear side and the back plate. As described above, when the fan rotates, it imparts a rotational velocity vector to the hot air flow. Under the combined action of the rotational velocity vector and the connecting plate 30 in a closed-loop structure, a part of the hot air flow will be guided by the side of the connecting plate 30 facing away from the inner container cavity, thereby realizing the flow of a part of the hot air flow along the outer peripheral edge of the air-permeable plate 20. Take Figures 1 to 3 the shown hot air blower baffle as an example:

[0060] When there is too much hot air flow reaching the first sloping plate 301 and the first chamfered sloping plate 305, causing Figure 3 air congestion to occur at the rear side of the upper left corner area of the hot air blower baffle in a certain situation, a part of the hot air flow will be guided by the first sloping plate 301 and the first chamfered sloping plate 305 to the side of the second sloping plate 302 facing away from the inner container cavity. Therefore, the guided hot air flow will be blown out from the inclined air outlet holes 33 formed in the second sloping plate 302, relieving the exhaust burden of the inclined air outlet holes 33 of the first sloping plate 301 and the first chamfered sloping plate 305. It can be understood that as the fan continues to rotate, a part of the hot air flow that fails to pass through the second sloping plate 302 will continue to flow along the outer peripheral edge of the air-permeable plate 20 under the guidance of the second sloping plate 302, the second chamfered sloping plate 306, and the third sloping plate 303. Finally, this part of the hot air flow is blown out from the inclined air outlet holes 33 formed in the fourth sloping plate 304. In this way, the problem of hot air flow accumulation and turbulence generation between the rear side of the hot air blower baffle and the back plate is greatly improved, and the hot air flow can be discharged from the rear side of the hot air blower baffle in a timely manner without generating too much resistance to the fan.

[0061] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0062] Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not used to limit the present utility model. As long as appropriate changes and variations made to the above embodiments fall within the scope of the spirit of the present utility model, they fall within the scope of protection required by the present utility model.

Claims

1. A hot air blower baffle, characterized in that: The invention comprises a fixing portion (10), an air-permeable plate (20) provided with a return air hole (21) and a positive air outlet hole (22), and a connecting plate (30) provided with an oblique air outlet hole (33); the connecting plate (30) is a closed-loop structure with a taper, and comprises a narrowed end edge (31) and a widened end edge (32) respectively located at two ends of the closed-loop structure; the narrowed end edge (31) is connected to the outer peripheral edge of the air-permeable plate (20), and the widened end edge (32) is connected to the fixing portion (10).

2. The hot air blower baffle according to claim 1, characterized in that: The figure of the oblique air outlet hole (33) projected onto the parallel surface of the air-permeable plate (20) is a closed figure.

3. The hot air blower baffle according to claim 2, characterized in that: The closed figure comprises a strip-shaped closed figure, the positive air outlet (22) comprises a strip-shaped positive air outlet (22), and at least part of the strip-shaped closed figure and at least part of the strip-shaped positive air outlet (22) have the same extension direction.

4. The hot air blower baffle according to claim 1, characterized in that: The outer peripheral edge of the ventilation plate (20) comprises a first side edge (201), a top edge (202), a second side edge (203) and a bottom edge (204) which are sequentially arranged and connected in pairs by chamfered edges; the connecting plate (30) comprises a first inclined plate (301), a second inclined plate (302), a third inclined plate (303) and a fourth inclined plate (304) which are sequentially arranged along the outer peripheral edge of the ventilation plate (20) and connected in pairs by chamfered inclined plates; The first inclined plate (301) is bent and connected to the first side edge (201), the second inclined plate (302) is bent and connected to the top edge (202), the third inclined plate (303) is bent and connected to the second side edge (203), the fourth inclined plate (304) is bent and connected to the bottom edge (204), and the chamfered inclined plates are bent and connected to the chamfered edges in a one-to-one correspondence.

5. The hot air blower baffle according to claim 4, characterized in that: At least part of the oblique air outlet holes (33) are opened on the chamfered inclined plate; and / or, At least one of the first inclined plate (301), the second inclined plate (302), the third inclined plate (303) and the fourth inclined plate (304) is provided with the inclined air outlet hole (33).

6. The hot air blower baffle according to claim 4, characterized in that: The first side (201) and the second side (203) are of equal length and parallel, and the distance between them is W; The top edge (202) and the bottom edge (204) are equal in length and parallel to each other, and the distance between them is H; The chamfered edge comprises a first chamfered edge (205) located between the first side edge (201) and the top edge (202), the length of the first chamfered edge (205) is L, and the angle between the first chamfered edge (205) and the top edge (202) is β, wherein: 110°≤β; and / or, 0.15H≤L≤0.4H; and / or, arctan(H / W)-20°≤β≤arctan(H / W)+20°.

7. The hot air blower baffle according to claim 1, characterized in that: The hot air blower baffle further comprises a side panel (40) provided with a side air outlet hole (41); the side panel (40) is a closed-loop structure; the fixing portion (10) and the widened end edge (32) are respectively connected to two ends of the side panel (40).

8. The hot air blower baffle according to claim 7, characterized in that: The angle between the connecting plate (30) and the ventilation plate (20) is α, and in the orientation perpendicular to the ventilation plate (20), the distance from the widened end edge (32) to the ventilation plate (20) is d1, and the distance from the fixing portion (10) to the widened end edge (32) is d2, and d2≤d1 / sinα.

9. The hot air blower baffle according to claim 8, characterized in that: 0.25(d1+d2)≤d2≤d1 / sinα≤0.75(d1+d2); and / or, 30°≤α≤70°.

10. A baking and cooking device, characterized in that: It comprises a hot air blower baffle as described in any one of claims 1 to 9.

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