Jet air duct system and cooking apparatus

Abstract

The application relates to a jet air duct system and a cooking device, which can improve the baking speed without occupying the cavity volume. The jet air duct system comprises: a liner assembly, which comprises a liner main body, a pair of air outlet baffles arranged on opposite sides of the liner main body and provided with a plurality of air outlet holes, and an air inlet baffle arranged in the liner main body and connected with the two air outlet baffles at two ends; each air outlet baffle is arranged in a spaced mode with the side wall of the liner main body to form a jet flow channel in communication with the air outlet hole; the middle part of the air inlet baffle is provided with an air inlet hole, and the air inlet baffle is arranged in a spaced mode with the side wall of the liner main body to form a pair of heating flow channels in communication with the air inlet hole and the two jet flow channels; a pair of cross-flow fans, each cross-flow fan is arranged at a bend communication position between the heating flow channel and the jet flow channel in a corresponding mode; and a pair of heaters, each heater is arranged in the heating flow channel in a corresponding mode.

Description

Technical Field

[0001] This application relates to the field of home appliance technology, and in particular to a jet air duct system and cooking equipment. Background Technology

[0002] With the improvement of people's living standards, ovens and steam ovens with steaming functions have become indispensable household appliances in modern kitchens. Existing ovens generally have two heating schemes: one heating scheme uses heating elements arranged on the top and bottom to heat food through heat radiation, which is mainly used in countertop ovens; the other heating scheme uses a rear hot air fan in conjunction with heating elements to heat food through forced convection, which is mainly used in built-in steam ovens.

[0003] Compared to radiant heating, forced convection offers several advantages: it significantly increases heating speed because its heat exchange is approximately ten times that of natural convection; the hot air effectively removes moisture from the food surface, facilitating caramelization; and the airflow acts as both a heat transfer medium and a water vapor transport medium, making it easier to control humidity within the cavity. However, to further accelerate baking, existing forced convection systems must increase the hot air circulation velocity within the cavity. This necessitates increasing motor power or impeller efficiency, leading to larger motors and fan blades that encroach on the available baking volume and significantly increase costs.

[0004] In addition, the airflow circulation path in the existing forced convection scheme is not good, which causes the high-speed hot air driven by the impeller to first collide with the side wall of the cavity for the first forced heat exchange, resulting in a significant loss of initial velocity and initial temperature. At the same time, there is a large-scale vortex at the center of the cavity. Because the center of the vortex is a flow dead zone, the convective heat transfer effect is poor during the actual heating process, resulting in the temperature in the central area being significantly lower than the temperature in the surrounding area, thus causing the food to bake at a slower speed. Summary of the Invention

[0005] Therefore, in view of the problems of existing forced convection schemes, such as serious encroachment on the available baking volume in the cavity and low baking speed, this application provides a jet air duct system and cooking device that can improve the baking speed without encroaching on the internal volume of the cavity.

[0006] In one embodiment of this application, the present invention provides a jet duct system, comprising:

[0007] The inner liner assembly includes an inner liner body, a pair of air outlet baffles arranged on opposite sides within the inner liner body and having multiple air outlet holes, and an air inlet baffle arranged within the inner liner body and connected at both ends to the two air outlet baffles respectively; each air outlet baffle is spaced apart from the side wall of the inner liner body to form a jet flow channel communicating with the air outlet holes; wherein the air inlet baffle has an air inlet hole in its middle, and the air inlet baffle is spaced apart from the side wall of the inner liner body to form a pair of heating channels communicating with the air inlet hole and the two jet flow channels;

[0008] A pair of cross-flow fans, each of the cross-flow fans being correspondingly positioned at the bend connecting the heating channel and the jet channel; and

[0009] A pair of heaters, each of which is correspondingly disposed within the heating channel.

[0010] According to one embodiment of this application, the jet duct system further includes a double-swallow-shaped jet plate correspondingly disposed within the jet duct and spaced apart from the air inlet baffle.

[0011] According to one embodiment of this application, the double-swallow-shaped jet plate has a pair of first swallow-shaped wings symmetrically arranged along the axial direction of the cross-flow fan; wherein the first swallow-shaped wings have a root corresponding to the center of the cross-flow fan, a tip corresponding to the shaft end of the cross-flow fan, and a first swallow-shaped wing surface that extends gradually from the root toward the tip relative to the air inlet baffle.

[0012] According to one embodiment of this application, the first wing surface extends along a logarithmic curve from the wing root toward the wingtip.

[0013] According to one embodiment of this application, the double-swallow-shaped jet plate further has a pair of second swallow wings symmetrically arranged along the axial direction of the cross-flow fan and a pair of transition portions extending from the first swallow wings to the second swallow wings respectively; wherein the second swallow wings are located on the side of the first swallow wings away from the cross-flow fan, and the thickness of the second swallow wings is greater than the thickness of the first swallow wings.

[0014] According to one embodiment of this application, the second swallow wing portion has a second swallow wing surface with the same surface shape as the first swallow wing surface; the transition portion has a transition surface with both ends tangent to the first swallow wing surface and the second swallow wing surface, respectively.

[0015] According to one embodiment of this application, the air outlet is an array of jet holes arranged on the air outlet baffle.

[0016] According to one embodiment of this application, the air outlet has an air inlet, an air outlet with an inner diameter smaller than that of the air inlet, and a drainage surface that extends curvedly from the air inlet to the air outlet.

[0017] According to one embodiment of this application, the projection of the air outlet into the air inlet is tangent to the windward edge of the air outlet.

[0018] According to one embodiment of this application, the inner diameter of the air inlet and the inner diameter of the air outlet satisfy the following relationship: In the formula: D1 is the inner diameter of the air inlet; D2 is the inner diameter of the air outlet; V is the airflow velocity in the jet channel.

[0019] According to one embodiment of this application, the two air inlet baffles are respectively located at the upper and lower parts of the inner liner body; the air inlet baffle is located at the rear part of the inner liner body; wherein the air inlet hole is a strip-shaped hole that is spaced apart along the vertical direction on the air inlet baffle and extends along the horizontal direction.

[0020] According to one embodiment of this application, the heater includes multiple layers of heating tubes spaced apart in the heating channel along the vertical direction, wherein each heating tube is parallel to the shaft of the cross-flow fan, and the heating tubes in different layers are staggered relative to each other.

[0021] According to another aspect of this application, one embodiment of this application further provides a cooking apparatus, comprising:

[0022] Door box assembly;

[0023] A storage basket is disposed within the door housing assembly; and

[0024] The jet duct system described above, wherein the jet duct system is installed within the door housing assembly for accommodating the storage basket.

[0025] In summary, since the cross-flow fan is located at the corner connecting the heating channel and the jet channel, the hot air pressurized by the cross-flow fan flows directly into the jet channel without first colliding with the side wall of the inner liner body before flowing into the jet channel. This avoids the loss of the initial velocity and initial temperature of the hot air, so that a smaller cross-flow fan can overcome the pressure resistance of the jet channel, thereby increasing the baking speed without encroaching on the baking volume inside the cavity.

[0026] Furthermore, since the air inlet located in the middle of the air inlet baffle corresponds to the center of the inner liner, and the air outlets on the two air outlet baffles are located on opposite sides of the storage basket, the two streams of hot air ejected from the air outlets on opposite sides will directly impact the opposite sides of the food, eliminating flow rate loss and temperature difference loss. This not only further increases the heat exchange efficiency but also ensures that the opposite sides of the food maintain the same temperature. At the same time, the hot air after impacting the food will flow back from the air inlet corresponding to the center of the inner liner, preventing the formation of a large-scale vortex at the center of the inner liner, thus improving the convection heat transfer effect and accelerating the baking speed. Attached Figure Description

[0027] Figure 1 This is a perspective view of a cooking apparatus according to an embodiment of this application;

[0028] Figure 2 A cross-sectional schematic diagram of a cooking apparatus according to the above embodiments of this application is shown;

[0029] Figure 3 An example of a jet air duct system in a cooking apparatus according to the above embodiments of this application is shown;

[0030] Figure 4 A three-dimensional cross-sectional schematic diagram of the jet duct system according to the above example of this application is shown;

[0031] Figure 5 An axial cross-sectional schematic diagram of the jet duct system according to the above example of this application is shown;

[0032] Figure 6 A partial schematic diagram of the jet duct system according to the above example of this application is shown;

[0033] Figure 7 It shows Figure 6 The diagram shown is an exploded view of the jet duct system.

[0034] Figure 8 It shows Figure 6 A radial cross-sectional schematic diagram of the jet duct system shown.

[0035] Figure 9 A schematic diagram of the structure of the air inlet baffle in the jet duct system according to the above example of this application is shown.

[0036] Explanation of key component symbols:

[0037] 1. Jet duct system; 10. Inner liner assembly; 101. Jet duct; 102. Heating duct; 11. Inner liner body; 12. Air outlet baffle; 120. Air outlet; 121. Air inlet; 122. Air outlet; 123. Air intake surface; 13. Air inlet baffle; 130. Air inlet; 14. Double swallow-shaped jet plate; 141. First swallow wing; 1411. Wing root; 1412. Wing tip; 1413. First swallow wing surface; 142. Second swallow wing; 1420. Second swallow wing surface; 143. Transition section; 1430. Transition curved surface; 20. Cross-flow fan; 30. Heater; 300. Heating tube; 2. Door box assembly; 3. Storage basket.

[0038] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0039] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Considering that traditional forced convection systems not only have increasingly larger motors and fan blades, severely encroaching on the available baking volume within the cavity, but also suffer from poor airflow circulation paths, resulting in significant losses of initial velocity and temperature; furthermore, large-scale vortices exist at the center of the cavity, leading to slower food baking speeds, this application provides a jet airflow system and cooking device that can improve baking speed without compromising the internal volume of the cavity.

[0044] Specifically, see the attached document. Figure 1 and Figure 2 As shown, one embodiment of this application provides a cooking device, which may include a door box assembly 2, a storage basket 3 for placing food, and a jet air duct system 1 installed inside the door box assembly 2 for accommodating the storage basket 3. The jet air duct system 1 is used to heat the circulating gas while driving the gas circulation flow inside the door box assembly 2, so that the heated gas is directly sprayed onto the food placed in the storage basket 3 for baking.

[0045] More specifically, such as Figures 2 to 9 As shown, the jet air duct system 1 may include an inner liner assembly 10, a pair of cross-flow fans 20, and a pair of heaters 30. The inner liner assembly 10 includes an inner liner body 11 fixed inside the door box assembly 2 for accommodating the storage basket 3, a pair of air outlet baffles 12 arranged on opposite sides inside the inner liner body 11 and having multiple air outlet holes 120, and an air inlet baffle 13 arranged inside the inner liner body 11 and connected at both ends to the two air outlet baffles 12 respectively; each air outlet baffle 12 is spaced apart from the side wall of the inner liner body 11 to form a jet flow channel 101 communicating with the air outlet hole 120; the air inlet baffle 13 has an air inlet hole 130 in the middle, and the air inlet baffle 13 is spaced apart from the side wall of the inner liner body 11 to form a pair of heating flow channels 102 communicating the air inlet hole 130 with the two jet flow channels 101. Each cross-flow fan 20 is correspondingly disposed at the corner connection between the heating channel 102 and the jet channel 101. Each heater 30 is correspondingly disposed within the heating channel 102.

[0046] Thus, as Figure 2As shown, when the cross-flow fan 20 is turned on, the hot air pressurized by the cross-flow fan 20 is first transported to each air outlet 120 through the jet channel 101, and then sprayed out through the air outlet 120 to directly blow the food located in the storage basket 3 for baking; at the same time, the air in the inner liner body 11 first flows into the heating channel 102 through the air inlet 130, and then is heated by the heater 30 in the heating channel 102 before flowing into the cross-flow fan 20, realizing the circulation of hot air in the cavity.

[0047] It is worth noting that since the cross-flow fan 20 is located at the corner connection between the heating channel 102 and the jet channel 101, the hot air pressurized by the cross-flow fan 20 flows directly into the jet channel 101 without first colliding with the side wall of the inner liner body 11 before flowing into the jet channel 101. This avoids the loss of the initial velocity and initial temperature of the hot air, so that the pressure resistance of the jet channel 101 can be overcome with a smaller power cross-flow fan 20, thereby increasing the baking speed without encroaching on the baking volume inside the cavity.

[0048] Furthermore, since the air inlet 130 located in the middle of the air inlet baffle 13 corresponds to the center of the inner liner body 11 (i.e., the position where the storage basket 3 is placed), and the air outlets 120 on the two air outlet baffles 12 are located on opposite sides of the storage basket 3, the two streams of hot air ejected from the air outlets 120 on opposite sides will directly impact the opposite sides of the food, eliminating flow rate loss and temperature difference loss. This not only further increases the heat exchange efficiency but also ensures that the opposite sides of the food maintain the same temperature. At the same time, the hot air after impacting the food will flow back from the air inlet 130 corresponding to the center of the inner liner body 11, preventing the formation of a large-scale vortex at the center of the inner liner body 11, improving the convection heat exchange effect, and accelerating the food baking speed.

[0049] For example, such as Figure 2 and Figure 4 As shown, the two air inlet baffles 13 are located at the upper and lower parts of the inner liner body 11, respectively. That is, the two jet channels 101 are located at the upper and lower sides of the storage basket 3, respectively, to blow air directly onto the food inside the storage basket 3 from both upper and lower directions, so that the top and bottom of the food are heated simultaneously to achieve the same temperature at the top and bottom. In this case, the air inlet baffle 13 can be located at the rear of the inner liner body 11. It is understood that the air inlet baffle 13 can also be located at the left or right side of the inner liner body 11. In addition, in other examples of this application, the two air inlet baffles 13 can also be located at the left and right sides of the inner liner body 11, respectively. In this case, the air inlet baffle 13 can be located at the upper, lower, or rear of the inner liner body 11, which will not be described in detail here.

[0050] Optionally, the rotational speed of the cross-flow fan 20 located at the lower part of the inner pot body 11 is different from that of the cross-flow fan 20 located at the upper part of the inner pot body 11, so that the flow rate of the hot air at the lower part is different from that at the upper part, which is convenient for matching the needs of different ingredients. For example, when baking a pizza, the rotational speed of the cross-flow fan 20 located at the lower part of the inner pot body 11 can be set to twice the rotational speed of the cross-flow fan 20 located at the upper part of the inner pot body 11 in order to achieve a crispy crust for the pizza. It is understood that in other examples of this application, the rotational speeds of the two cross-flow fans 20 can also be the same in order to ensure uniform baking of the top and bottom of the food.

[0051] Optionally, such as Figure 3 and Figure 4 As shown, the air inlet 130 is implemented as a strip-shaped hole that is spaced apart along the vertical direction on the air inlet baffle 13 and extends along the horizontal direction, such that the extension direction of the strip-shaped hole corresponds to the axial direction of the cross-flow fan 20, that is, the strip-shaped hole is parallel to the rotation axis of the cross-flow fan 20, which helps to ensure that the air intake volume is consistent at all points along the axial direction of the cross-flow fan 20.

[0052] Optionally, such as Figure 3 and Figure 4 As shown, the heater 30 includes multiple layers of heating tubes 300 arranged at intervals along the vertical direction within the heating channel 102. Each heating tube 300 is parallel to the axis of rotation of the cross-flow fan 20, and the heating tubes 300 in different layers are staggered. This not only ensures that the airflow into the cross-flow fan 20 through the heating channel 102 is consistent at all axial points, but also ensures that the heating tubes 300 in the upper layer are not blocked by the heating tubes 300 in the lower layer. This allows the air flowing in the heating channel 102 to directly blow onto the heating tubes 300 in different layers, thereby improving the heat exchange efficiency.

[0053] Optionally, such as Figure 3 and Figure 6 As shown, the air outlet 120 is implemented as an array of jet holes arranged on the air outlet baffle 12, so that hot air is sprayed through the jet holes to directly blow on various parts of the food, which facilitates the formation of jet impact and improves the baking efficiency of the food. It can be understood that the jet holes mentioned in this application are used to spray heating gas at a certain pressure at high speed to directly impact the food. Compared with the traditional oven hot air technology, the convective heat transfer coefficient of the jet impact technology of this application can be increased by ten times, which can make the food reach or approach the temperature of the impact airflow in a shorter time, and its heating effect is close to that of frying.

[0054] It is worth noting that, since the air volume at both ends of the axial flow fan 20 is often less than that at the middle of the axial flow fan 20, the hot air velocity entering the jet channel 101 from both ends of the axial flow fan 20 is less than that entering the jet channel 101 from the middle of the axial flow fan 20. At the same time, along the flow direction of the jet channel 101 (i.e., along the direction away from the axial flow fan 20), the hot air velocity in the jet channel 101 will gradually decrease. Therefore, along the axial direction of the axial flow fan 20, the hot air velocity at the air outlet 120 on the air outlet baffle 12 closer to the middle of the axial flow fan 20 is greater, and correspondingly, the jet velocity at the air outlet 120 is also greater, and vice versa. Similarly, along the flow direction of the jet channel 101 (along the radial direction of the cross-flow fan 20), the hot air velocity on the air outlet baffle 12 is greater closer to the air outlet 120 of the cross-flow fan 20, and correspondingly, the jet velocity of the air outlet 120 is also greater, and vice versa. In this way, the difference in hot air velocity ejected through different jet holes is large, resulting in uneven baking of food, large color difference, and poor baking quality.

[0055] To improve the uniformity of food baking, such as Figure 2 , Figure 4 as well as Figure 5 As shown, the inner liner assembly 10 of this application may further include a double-swallow-shaped jet plate 14 correspondingly disposed within the jet channel 101 and spaced apart from the air outlet baffle 12, so as to uniformly distribute the hot air flowing in the jet channel 101 by changing the flow cross-sectional area, so that the airflow velocity at each jet hole on the air outlet baffle 12 is consistent, thereby reducing the difference in hot air velocity ejected through different jet holes and improving the food baking quality.

[0056] Optionally, such as Figure 5 and Figure 7 As shown, the double-swallow-shaped jet plate 14 has a pair of first swallow-wing portions 141 symmetrically arranged along the axial direction of the cross-flow fan 20. Each first swallow-wing portion 141 has a root 1411 corresponding to the center of the cross-flow fan 20, a tip 1412 corresponding to the shaft end of the cross-flow fan 20, and a first swallow-wing surface 1413 that extends gradually from the root 1411 towards the tip 1412 relative to the outlet baffle 12. Figure 5 As shown, the distance between the first wing surface 1413 at the wing root 1411 and the air outlet baffle 12 is greater than the distance between the first wing surface 1413 at the wing tip 1412 and the air outlet baffle 12, so that the airflow velocity in the jet channel 101 is uniformly distributed along the axial direction of the cross-flow fan 20.

[0057] Optionally, the first wing surface 1413 extends from the wing root 1411 toward the wing tip 1412 along a logarithmic curve. That is, the first wing surface 1413 is the trajectory formed by the continuous radial movement of the logarithmic curve along the cross-flow fan 20, ensuring that the airflow velocity in the jet channel 101 is distributed as evenly as possible along the axial direction of the cross-flow fan 20, so that the hot air flow velocity ejected through the multiple jet holes distributed along the axial direction of the cross-flow fan 20 on the air outlet baffle 12 remains consistent.

[0058] Optionally, such as Figure 4 , Figure 7 as well as Figure 8 As shown, the double-swallow-shaped jet plate 14 also has a pair of second swallow-wing portions 142 symmetrically arranged along the axial direction of the cross-flow fan 20, and a pair of transition portions 143 extending from the first swallow-wing portion 141 to the second swallow-wing portion 142 respectively. The second swallow-wing portion 142 is located on the side of the first swallow-wing portion 141 away from the cross-flow fan 20, and the thickness of the second swallow-wing portion 142 is greater than the thickness of the first swallow-wing portion 141. In this way, along the flow direction of the jet channel 101, the distance between the second swallow-wing portion 142 and the air outlet baffle 12 is smaller than the distance between the first swallow-wing portion 141 and the air outlet baffle 12, so that the hot air velocity in the jet channel 101 is evenly distributed in the flow direction, and the hot air velocity ejected through the multiple jet holes radially distributed along the cross-flow fan 20 on the air outlet baffle 12 is kept as consistent as possible. It is understood that in other examples of this application, the double-swallow-shaped jet plate 14 may also have a third swallow wing or a fourth swallow wing, etc., in order to match a longer jet channel 101 or further improve the uniformity of airflow distribution. This application will not elaborate on this further.

[0059] Optionally, such as Figure 7 and Figure 8 As shown, the second swallow wing portion 142 may have a second swallow wing surface 1420 that is the same as or similar to the first swallow wing surface 1413 of the first swallow wing portion 141, so as to ensure that the hot air flow rate ejected through the multiple jet holes distributed along the axial direction of the cross-flow fan 20 on the air outlet baffle 12 remains consistent.

[0060] Optionally, such as Figure 7 and Figure 8 As shown, the transition section 143 has a transition surface 1430 at both ends that are tangent to the first swallowtail surface 1413 and the second swallowtail surface 1420, respectively, to ensure that the airflow can flow smoothly from the first swallowtail surface 1413 to the second swallowtail surface 1420, which helps to significantly reduce flow resistance. It can be understood that the transition surface 1430 can be a trajectory formed by the continuous movement of a logarithmic curve along a smooth curve.

[0061] It is worth noting that although the double-swallow-shaped jet plate 14 of this application can uniformly distribute the airflow along the flow path (i.e., along the airflow direction) and spanwise (i.e., the axial direction of the cross-flow fan 20) by changing the airflow cross-sectional area, making the hot air velocity at each jet hole on the outlet baffle 12 as consistent as possible, the airflow difference in different parts of each conventional straight-hole jet hole is still relatively large. That is, the airflow is mainly concentrated at the windward sidewall of each straight hole, resulting in uneven local heat transfer performance of the conventional straight-hole jet. To solve this problem, such as Figure 4 As shown, the air outlet 120 mentioned in this application is implemented as a jet hole that extends obliquely through the air outlet baffle 12 along the airflow direction, so as to better guide the airflow into the jet hole and be ejected.

[0062] Optionally, such as Figure 8 and Figure 9 As shown, the air outlet 120 has an air inlet 121, an air outlet 122 with an inner diameter smaller than that of the air inlet 121, and a guide surface 123 extending curvedly from the air inlet 121 to the air outlet 122, so as to guide the airflow smoothly into the air outlet 120 while uniformly distributing the local heat transfer performance within each air outlet 120. Preferably, the guide surface 123 is implemented as a convex surface to better guide the airflow direction and reduce wind resistance.

[0063] Optionally, such as Figure 8 and Figure 9 As shown, the projection of the air outlet 122 into the air inlet 121 is tangent to the windward edge of the air inlet 121, so as to extend the extension distance of the guide surface 123 as much as possible and reduce the airflow resistance.

[0064] It is worth noting that the extension distance of the airflow guiding surface 123 mentioned in this application is related to the airflow velocity. That is, the greater the airflow velocity, the greater the extension distance of the airflow guiding surface 123 needs to be; at the same time, the smaller the airflow velocity, the smaller the extension distance of the airflow guiding surface 123 can be, so as to ensure the uniform local heat transfer performance of the air outlet 120. Considering that the extension distance of the airflow guiding surface 123 is limited by the inner diameter of the air inlet 121 and the air outlet 122, in order to adapt to baking needs, the inner diameter of the air inlet 121 and the inner diameter of the air outlet 122 in this application satisfy the following relationship:

[0065]

[0066] In the formula: D1 is the inner diameter of the air inlet 121; D2 is the inner diameter of the air outlet 122; V is the airflow velocity in the jet channel. It is understood that the airflow velocity V mentioned in this application is assumed to be greater than 1m / s.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0068] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A jet duct system, characterized in that, include: The inner liner assembly includes an inner liner body, a pair of air outlet baffles arranged on opposite sides within the inner liner body and having multiple air outlet holes, and an air inlet baffle arranged within the inner liner body and connected at both ends to the two air outlet baffles respectively; each air outlet baffle is spaced apart from the side wall of the inner liner body to form a jet flow channel communicating with the air outlet holes; wherein the air inlet baffle has an air inlet hole in its middle, and the air inlet baffle is spaced apart from the side wall of the inner liner body to form a pair of heating channels communicating with the air inlet hole and the two jet flow channels; A pair of cross-flow fans, each of the cross-flow fans being correspondingly positioned at the bend connecting the heating channel and the jet channel; and A pair of heaters, each of which is correspondingly disposed within the heating channel.

2. The jet duct system according to claim 1, characterized in that, The jet duct system also includes double-swallow-shaped jet plates that are correspondingly disposed within the jet duct and spaced apart from the air inlet baffle.

3. The jet duct system according to claim 2, characterized in that, The double-swallow-shaped jet plate has a pair of first swallow-wing portions symmetrically arranged along the axial direction of the cross-flow fan; wherein the first swallow-wing portion has a root corresponding to the center of the cross-flow fan, a tip corresponding to the shaft end of the cross-flow fan, and a first swallow-wing surface that extends gradually from the root toward the tip relative to the air inlet baffle.

4. The jet duct system according to claim 3, characterized in that, The first wing surface extends along a logarithmic curve from the wing root toward the wingtip.

5. The jet duct system according to claim 3, characterized in that, The double-swallow-shaped jet plate also has a pair of second swallow wings symmetrically arranged along the axial direction of the cross-flow fan and a pair of transition portions extending from the first swallow wings to the second swallow wings respectively; wherein the second swallow wings are located on the side of the first swallow wings away from the cross-flow fan, and the thickness of the second swallow wings is greater than the thickness of the first swallow wings.

6. The jet duct system according to claim 5, characterized in that, The second swallow wing portion has a second swallow wing surface with the same surface shape as the first swallow wing surface; the transition portion has a transition curved surface at both ends that are tangent to the first swallow wing surface and the second swallow wing surface, respectively.

7. The jet duct system according to any one of claims 1 to 6, characterized in that, The air outlet holes are jet holes arranged in an array on the air outlet baffle.

8. The jet duct system according to claim 7, characterized in that, The air outlet has an air inlet, an air outlet with an inner diameter smaller than the air inlet, and a flow-guiding surface that extends curvedly from the air inlet to the air outlet.

9. The jet duct system according to claim 8, characterized in that, The projection of the air outlet into the air inlet is tangent to the windward edge of the air outlet.

10. The jet duct system according to claim 9, characterized in that, The inner diameter of the air inlet and the inner diameter of the air outlet satisfy the following relationship: In the formula: D1 is the inner diameter of the air inlet; D2 is the inner diameter of the air outlet; V is the airflow velocity in the jet channel.

11. The jet duct system according to any one of claims 1 to 6, characterized in that, The two air inlet baffles are located at the upper and lower parts of the inner liner body, respectively; the air inlet baffle is located at the rear of the inner liner body; wherein the air inlet hole is a strip-shaped hole that is spaced apart along the vertical direction on the air inlet baffle and extends along the horizontal direction.

12. The jet duct system according to claim 11, characterized in that, The heater includes multiple layers of heating tubes spaced apart in the heating channel along the vertical direction, wherein each heating tube is parallel to the shaft of the cross-flow fan, and the heating tubes in different layers are staggered relative to each other.

13. A cooking appliance, characterized in that, include: Door box assembly; A storage basket is disposed within the door housing assembly; as well as The jet duct system as described in any one of claims 1 to 12, wherein the jet duct system is installed within the door housing assembly for accommodating the storage basket.

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