Oven

Abstract

This application provides an oven, which includes a shell, an inner liner, a heating element, a hot air circulation fan, and a pressure relief mechanism. The inner liner is disposed within the shell and has a first space. The heating element is disposed within the first space. The hot air circulation fan includes an impeller located within the first space, used to drive airflow to generate airflow passing through the heating element, and the airflow forms an airflow path within the first space. The pressure relief mechanism includes a pressure relief hole penetrating the inner liner, located on the airflow path, and when the hot air circulation fan is running, the hot airflow forms an air curtain inside the pressure relief hole. This air curtain prevents hot air leakage when the internal and external pressure difference is small, and allows hot air to escape when the pressure difference is large, achieving a pressure relief function similar to a one-way valve, without the need for moving parts, avoiding failure problems caused by oil adhesion.

Description

Technical Field

[0001] This application belongs to the field of kitchen appliance technology, and more specifically, relates to an oven. Background Technology

[0002] During oven operation, the temperature and pressure inside the cavity rise, requiring a pressure relief mechanism to release excess gas. Existing technologies employ valve-controlled pressure relief, using the opening and closing of the valve to maintain pressure balance inside and outside the cavity. However, ovens accumulate grease during use, which can adhere to the valve, causing it to become stuck or leak, thus rendering the pressure relief function ineffective. Summary of the Invention

[0003] The purpose of this application is to provide an oven to solve the technical problem in the prior art where the pressure relief function fails due to oil stains adhering to it.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide an oven, the oven comprising:

[0005] case;

[0006] Inner liner; the inner liner has a first space and is disposed inside the shell;

[0007] Heating element; the heating element is disposed within the first space;

[0008] Hot air circulation fan; The hot air circulation fan is used to drive airflow to generate a hot air circulation flow through the heating element, and the hot air circulation flow forms an airflow path in the first space;

[0009] Pressure relief mechanism; The pressure relief mechanism includes a pressure relief hole that penetrates the inner liner. The pressure relief hole is located on the airflow path, and when the hot air circulation fan is running, the hot air circulation forms an air curtain on the side of the pressure relief hole located in the first space.

[0010] Optionally, the heat circulation fan includes an impeller;

[0011] The oven also includes a fan cover plate, which is connected to the inner cavity and divides the first space into a cooking cavity and a heating cavity. The cooking cavity is used to hold food, and the impeller and heating element are located in the heating cavity.

[0012] An airflow passage exists between the cooking cavity and the heating cavity;

[0013] The airflow path extends between the impeller and the airflow channel, and the pressure relief hole is located in the heating chamber, between the impeller and the airflow channel.

[0014] Optionally, the airflow channel includes an air inlet formed on the shroud cover and an air outlet formed between the shroud cover and the inner liner;

[0015] The pressure relief hole is located on the airflow path between the impeller and the air outlet.

[0016] Optionally, a second space is provided between the shell and the inner liner, the second space including a top cavity located between the top wall of the inner liner and the top wall of the shell;

[0017] The oven also includes a cooling fan and a cooling channel. One end of the cooling channel is connected to the outlet of the cooling fan, and the other end is connected to the outside of the oven. The inlet of the cooling fan is connected to the top cavity.

[0018] The pressure relief mechanism also includes a pressure relief channel, one end of which is connected to the pressure relief hole, and the other end extends into the top cavity and is connected to the top cavity.

[0019] Optionally, a heat insulation element is provided in the top cavity, which divides the top cavity into a lower cavity near the top of the inner liner and an upper cavity away from the top of the inner liner.

[0020] The cooling fan is mounted on the heat insulation component, and the inlet of the cooling fan is connected to the upper cavity.

[0021] The pressure relief channel is formed inside the insulation component, and the other end of the pressure relief channel extends to the upper cavity to communicate with the upper cavity.

[0022] Optionally, the pressure relief channel includes:

[0023] The first section; the first section is connected to the pressure relief hole and extends horizontally;

[0024] The second section is connected to the first section and extends upwards.

[0025] Optionally, the pressure relief channel also includes a third section, which is connected to the second section. The third section bends relative to the second section and extends obliquely upward.

[0026] Optionally, the second space also includes a rear cavity located between the rear wall of the inner liner and the rear wall of the shell;

[0027] There is a first gap between the heat insulation component and the rear wall of the housing, and the rear cavity and the upper cavity are connected through the first gap.

[0028] The first and second sections are located in the rear cavity, with the second section extending from the first gap to the upper cavity, and the third section located in the upper cavity, extending from the first gap toward the inlet of the cooling fan.

[0029] Optionally, the distance between the pressure relief hole and the heating element is 15mm to 40mm, so as to use the heat of the heating element to pyrolyze the oil in the first section.

[0030] Optionally, the pressure relief hole is located downstream of the heating element along the airflow path, and the pressure relief hole and the heating element are offset from each other in the airflow path.

[0031] The beneficial effects of the oven provided in this application are as follows: Compared with the prior art, in the oven of this application embodiment, when the hot air circulation fan is running, the impeller drives the airflow, generating an airflow that flows through the heating element, and this airflow forms an airflow path within the first space. A pressure relief hole is located on this airflow path, causing the airflow to form an air curtain on the side of the pressure relief hole located in the first space. This air curtain has a dynamic pressure relief regulation function. When the pressure difference inside and outside the first space is small, the airflow pressure of the air curtain is sufficient to prevent hot air from escaping from the pressure relief hole, thereby reducing heat loss. When the pressure difference inside the first space increases due to heating to the point that it exceeds the blocking capacity of the air curtain, the hot air can overcome the air curtain and be discharged from the pressure relief hole, achieving automatic pressure relief. Thus, the pressure relief mechanism utilizes the air curtain to achieve a function similar to a one-way valve, allowing exhaust when the pressure inside the cavity is too high and suppressing hot air overflow during normal operation. At the same time, since the air curtain is formed by airflow and requires no moving parts, it fundamentally avoids the problems of valve jamming, poor sealing, or complete failure caused by oil adhesion, fundamentally improving the long-term reliability of the pressure relief mechanism. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is an external schematic diagram of the oven in an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the interior of the oven in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the interior rear side of the oven in an embodiment of this application;

[0036] Figure 4 This is a three-dimensional schematic diagram of the oven cross-section in an embodiment of this application;

[0037] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0038] Figure 6 This is a block diagram illustrating the principle of suppressing pressure relief during the low-temperature stage of the oven in this application embodiment;

[0039] Figure 7 This is a block diagram illustrating the principle of rapid pressure relief during the high-temperature stage of the oven in this embodiment of the application.

[0040] Figure 8 This is a schematic diagram of the pressure relief channel in an embodiment of this application;

[0041] Figure 9 This is a planar schematic diagram of the oven cross-section in an embodiment of this application;

[0042] Figure 10 This is a diagram showing the positional relationship between the heat circulation fan, heating element, and pressure relief hole in an embodiment of this application.

[0043] Figure label:

[0044] Shell 1; Second space 11; Top cavity 111; Upper cavity 1111; Lower cavity 1112; Rear cavity 112; First partition 113; Door 2; Inner liner 3; First space 31; Cooking cavity 311; Heating cavity 312; Heating element 4; Hot air circulation fan 5; Airflow path 51; Impeller 52; Fan cover 53; Airflow channel 54; Air inlet 541; Air outlet 542; Pressure relief hole 6; Pressure relief channel 61; First section 611; Second section 612; Third section 613; Cooling fan 7; Cooling channel 71; Heat insulation component 72. Detailed Implementation

[0045] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0046] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0047] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0048] 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 one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0049] An oven is a common cooking appliance containing an inner cavity and heating elements. The heating elements bake the food inside the cavity. During oven operation, the temperature inside the cavity rises, causing the air to expand and resulting in a higher pressure inside the cavity than the external environment. If this pressure is not released, excessive pressure can damage the oven's sealing structure and even pose safety risks. Therefore, ovens typically require a pressure relief system to allow excess gas to escape from the cavity.

[0050] However, the presence of a pressure relief structure also leads to heat loss. If the pressure relief structure remains open, hot air inside the oven cavity will continuously escape, resulting in reduced oven efficiency, longer cooking times, and increased energy consumption. To address this issue, some oven designs incorporate a one-way valve as a pressure relief device. The one-way valve remains closed when the internal pressure of the cavity is low, preventing hot air from escaping; it only opens automatically when the internal pressure reaches a certain threshold, allowing gas to escape. This design reduces heat loss and improves energy efficiency to some extent.

[0051] However, ovens produce grease during cooking, which can easily accumulate inside the one-way valve and adhere to its moving parts. Since the moving parts of the one-way valve are usually located in relatively narrow gaps, once grease enters these narrow areas, it will gradually accumulate and solidify, causing the moving parts to move obstructed. This can lead to problems such as valve jamming, poor sealing, or inability to open properly, ultimately causing the pressure relief function to fail.

[0052] Other oven designs employ actively controllable valves for pressure relief. These valves use electromagnets, motors, or other drive components to open and close, actively controlling the timing of pressure relief based on pressure signals from the inner cavity or the cooking program. While this approach avoids the oil sludge buildup issues caused by passive one-way valves, a narrow gap still exists between the valve core and seat, allowing oil to seep in and accumulate, increasing valve resistance. Using a low-force drive component can easily lead to incomplete valve operation or failure to open due to oil buildup; using a high-force drive component for reliability requires larger actuators and more complex transmission mechanisms, significantly increasing manufacturing costs, system failure points, and control complexity. Therefore, ensuring pressure relief functionality while avoiding the impact of oil on the pressure relief mechanism and simplifying the pressure relief structure are key challenges in oven pressure relief technology.

[0053] To address the aforementioned problems, this application provides an oven; please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 The oven includes:

[0054] Casing 1;

[0055] Inner liner 3; Inner liner 3 has a first space 31, and inner liner 3 is disposed inside shell 1;

[0056] Heating element 4; heating element 4 is disposed within the first space 31;

[0057] The hot air circulation fan 5 is used to drive airflow to generate a hot air circulation airflow that flows through the heating element 4, and the hot air circulation airflow forms an airflow path 51 in the first space 31.

[0058] Pressure relief mechanism; The pressure relief mechanism includes a pressure relief hole 6 that penetrates the inner liner 3. The pressure relief hole 6 is located on the airflow path 51, and when the hot circulation fan 5 is running, the hot circulation airflow forms an air curtain on the side of the pressure relief hole 6 located in the first space 31.

[0059] like Figure 1 and Figure 2 As shown, in this embodiment, the oven has a shell 1 and an inner liner 3 disposed within the shell 1, forming a first space 31 for cooking. A door 2 is typically provided on the shell 1 to close the first space 31. A heating element 4 is disposed within the first space 31; when energized, the heating element 4 generates heat to heat the air and food within the first space 31.

[0060] like Figure 2 and Figure 3As shown, a hot air circulation fan 5 is also installed inside the first space 31. The hot air circulation fan 5 drives airflow, thereby generating a hot airflow that can flow through the heating element 4. When the hot air circulation fan 5 is running, its rotating parts push the air in the first space 31 to move in a specific direction. The air is heated as it passes over the surface of the heating element 4, forming a hot airflow with a high temperature. Due to the geometric constraints of the inner wall 3 and the guidance of the driving direction of the hot air circulation fan 5, this hot airflow tends to circulate along a relatively stable flow trajectory inside the first space 31, which is the airflow path 51. The existence of the airflow path 51 allows the hot air in the first space 31 to circulate continuously, which helps to reduce the temperature difference between different areas in the cavity and improves the uniformity of heating of food and cooking efficiency.

[0061] The pressure relief mechanism has a pressure relief hole 6 that penetrates the wall of the inner liner 3. This pressure relief hole 6 connects the first space 31 with the external area of ​​the inner liner 3, allowing excess gas generated inside the first space 31 due to heat expansion or evaporation of food moisture to be discharged outwards, thus balancing the internal and external air pressure. The pressure relief hole 6 is located above the airflow path 51 formed by the aforementioned hot air circulation. When the hot air circulation fan 5 is running, the hot air circulation flowing along the airflow path 51 will sweep across the opening of the pressure relief hole 6 at a high velocity, facing the interior of the first space 31. According to the principles of fluid mechanics, the surface of a high-speed flowing fluid has relatively low static pressure and relatively high dynamic pressure. This hot air circulation flow sweeping across the opening forms an aerodynamic barrier, i.e., an air curtain, composed of flowing air, inside the pressure relief hole 6.

[0062] During the initial stage of cooking and most of the normal cooking period, the pressure increase inside the first space 31 due to temperature rise is relatively limited. At this time, the static pressure of the gas inside the cavity is relatively low, while the air curtain formed by the hot circulating airflow at the pressure relief hole 6 has a high dynamic pressure, which can suppress and block the tendency of the gas inside the cavity to escape. The presence of the air curtain keeps the pressure relief hole 6 in a near-closed state during this stage, which can reduce the direct and large-scale escape of heated gas from the pressure relief hole 6. Thus, while retaining the necessary pressure relief channel 61, unnecessary heat loss is reduced, which promotes shorter preheating time, maintains cooking temperature stability, and improves the overall energy efficiency of the machine.

[0063] As the cooking process continues, the release of water from the ingredients, the decomposition of oil components, and the further increase in the internal temperature all contribute to the gradual accumulation of the total amount and pressure of gas inside the first space 31. When the static pressure of the gas inside the cavity increases to a certain level, its outward force increases accordingly. Under these circumstances, the effect of the air curtain formed by the hot airflow at the pressure relief hole 6 on inhibiting gas leakage is partially overcome. The gas inside the cavity begins to pass through the air curtain area intermittently or continuously in small amounts in a controlled manner, and is discharged outward through the pressure relief hole 6. The actual leakage rate and total amount of gas are affected by the relationship between the instantaneous pressure value inside the cavity and the dynamic intensity of the air curtain. Since the intensity of the air curtain is related to the operating speed of the hot air circulation fan 5, and the speed of the hot air circulation fan 5 can be set or adjusted in the product design, this embodiment achieves passive dynamic adjustment of the pressure relief process in practical applications. This adjustment mechanism does not rely on additional mechanical valves or electronic control units, but rather on the passive balance between the pneumatic air curtain and the internal pressure.

[0064] After the cooking process is completed, the heating element 4 stops being powered on and heating, while the hot air circulation fan 5 continues to run for a period of time or stops. When the speed of the hot air circulation fan 5 decreases or stops completely, the airflow path 51 inside the first space 31 weakens accordingly, and the air curtain effect acting on the inner orifice of the pressure relief hole 6 also weakens or dissipates. At this time, if there is still residual positive pressure and high-temperature residual heat gas inside the first space 31, since the suppression effect of the air curtain has weakened or disappeared, this part of the gas can be smoothly discharged to the outside through the pressure relief hole 6, which helps the first space 31 gradually return to a pressure and temperature state close to the external environment.

[0065] In the above structural arrangement and operation, the pressure relief mechanism mainly consists of pressure relief holes 6 opened on the inner wall 3. It does not include movable mechanical components such as valve cores, springs, or sealing gaskets, nor does it employ active drive elements such as electromagnets or motors. Therefore, there are no narrow clearances or moving parts, and even if oil fumes or grease particles generated during cooking enter the pressure relief holes 6 with the airflow, the risk of them getting stuck, accumulating, or having their movement obstructed is relatively low. This structural feature helps maintain the long-term unobstructed flow of the pressure relief channel 61, reducing the possibility of a decrease in pressure relief function due to oil buildup.

[0066] By forming an air curtain inside the pressure relief hole 6 through hot air circulation, the gas flow in the pressure relief channel 61 can be regulated during cooking. When the pressure inside the cavity is low, the air curtain inhibits the continuous leakage of hot air, reducing ineffective heat loss, which plays a positive role in shortening preheating time, stabilizing cooking temperature, and reducing energy consumption per unit cooking process. The pressure relief mechanism does not require additional complex valve assemblies, drive devices, or matching control circuits; the basic construction of the pressure relief channel 61 can be achieved simply by machining the pressure relief hole 6 on the inner wall of the inner liner 3. This design helps simplify material composition and reduce assembly processes, thereby reducing the overall manufacturing cost of the product to a certain extent and reducing potential assembly failure points.

[0067] Furthermore, the pressure relief mechanism does not involve contact or friction between moving mechanical parts during normal operation, thus avoiding operational noise caused by valve opening and closing, and eliminating performance degradation issues due to mechanical wear. As long as the hot air circulation fan 5 operates normally as expected, the air curtain effect at the pressure relief port 6 can be maintained continuously.

[0068] Please see Figure 4 In some embodiments of this application, the hot air circulating fan 5 includes an impeller 52; the oven also includes a fan cover 53, which is connected to the inner cavity 3 and divides the first space 31 into a cooking cavity 311 and a heating cavity 312. The cooking cavity 311 is used to hold food, and the impeller 52 and the heating element 4 are located in the heating cavity 312. An airflow channel 54 is provided between the cooking cavity 311 and the heating cavity 312. The airflow path 51 extends between the impeller 52 and the airflow channel 54, and the pressure relief hole 6 is located in the heating cavity 312 and between the impeller 52 and the airflow channel 54.

[0069] In this embodiment, the heat circulation fan 5 includes an impeller 52. The impeller 52 is a rotating component in the heat circulation fan 5 that directly drives the air movement. It consists of multiple blades and a central hub and is mounted on the shaft of the drive motor. The motor is usually mounted on the rear side of the impeller 52, that is, between the rear wall of the inner liner 3 and the rear wall of the housing 1. Heat dissipation holes can also be provided on the rear wall of the housing 1 to dissipate heat from the motor. When the motor is running, the impeller 52 rotates with the shaft, and the blades exert a force on the surrounding air, causing the air to gain kinetic energy and flow in a specific direction.

[0070] The oven in this embodiment also includes a fan cover 53. The fan cover 53 is connected to the inner cavity 3 and divides the first space 31 into a cooking cavity 311 and a heating cavity 312. The fan cover 53 is typically a plate-shaped component, fixed to the inner wall of the inner cavity 3 by a connecting structure. After the fan cover 53 is installed, the originally complete and continuous first space 31 is divided into two functionally different areas. The cooking cavity 311 is used to hold food and is the operating space for the user to place the food to be cooked. The heating cavity 312 is used to hold the impeller 52 and the heating element 4, both of which are located inside the cavity. By arranging the impeller 52 and the heating element 4 together in the heating cavity 312, the generation of heat and the driving of airflow are completed in the same relatively independent subspace. This layout physically isolates the high-temperature heating element 4 and the high-speed rotating impeller 52 from the food placement area, reducing the risk of the user directly contacting high-temperature or moving parts, and also providing a structural basis for the orderly organization of airflow.

[0071] An airflow channel 54 is provided between the cooking cavity 311 and the heating cavity 312. The airflow channel 54 is an air circulation path connecting the cooking cavity 311 and the heating cavity 312, and can be one or more openings or gaps. The presence of the airflow channel 54 allows the hot circulating airflow generated in the heating cavity 312 to enter the cooking cavity 311 to heat the food, while the air in the cooking cavity 311 can also return to the heating cavity 312 through the airflow channel 54 to be heated again, thereby establishing a continuous airflow circulation relationship between the two cavities.

[0072] Airflow path 51 extends between impeller 52 and airflow channel 54. Airflow path 51 refers to the flow trajectory of the hot circulating airflow generated by the hot circulating fan 5 within the first space 31, extending from the location of impeller 52 to the location of airflow channel 54. The airflow generated by the rotation of impeller 52 flows inside heating chamber 312, with its flow direction towards airflow channel 54, and exits heating chamber 312 via airflow channel 54 after reaching it.

[0073] The pressure relief hole 6 is located inside the heating chamber 312, between the impeller 52 and the airflow channel 54. The pressure relief hole 6 is a through hole formed in the wall of the inner liner 3, located within the area of ​​the inner liner 3 wall surface corresponding to the heating chamber 312. More specifically, the pressure relief hole 6 is formed within the space between the impeller 52 and the airflow channel 54, situated along the airflow path from the impeller 52 to the airflow channel 54. The inner opening of the pressure relief hole 6 faces the airflow area inside the heating chamber 312.

[0074] When the oven is operating, the impeller 52 of the hot air circulation fan 5 rotates within the heating chamber 312, propelling the air within the heating chamber 312 towards the airflow channel 54. During this flow, the air passes over the surface of the heating element 4, also located within the heating chamber 312, and is heated, forming a hot air circulation flow. This hot air circulation flow moves within the heating chamber 312 in the direction from the impeller 52 towards the airflow channel 54, passing through the area where the pressure relief hole 6 is located, and laterally sweeping across the side opening of the pressure relief hole 6 facing the interior of the heating chamber 312, thus forming an air curtain inside the pressure relief hole 6. Subsequently, the hot air circulation flow enters the cooking chamber 311 through the airflow channel 54, heating the food placed within the cooking chamber 311. After heat exchange, the air can return to the heating chamber 312 through the airflow channel 54 or other paths, where it is reheated and driven, forming a continuous circulation.

[0075] The pressure relief hole 6 is located inside the heating chamber 312 and between the impeller 52 and the airflow channel 54, placing it in an active section of the airflow within the heating chamber 312. The airflow generated by the rotation of the impeller 52 flows through this area before reaching the airflow channel 54, where the airflow is concentrated and the velocity is relatively high, which helps to form a stable and continuous air curtain inside the pressure relief hole 6. The effectiveness of the air curtain in suppressing gas leakage from the chamber is directly related to the airflow pressure passing through this area; the flow conditions in this region help enhance the blocking effect of the air curtain.

[0076] Because the heating cavity 312 is obscured by the fan cover 53, the user can only directly observe the cooking cavity 311 when opening the oven door. The pressure relief vent 6, located on the wall of the heating cavity 312 behind the fan cover 53, is not easily visible to the user. This layout improves the visual neatness of the inner liner 3, giving it a more concise and unified appearance, and also reduces the possibility of the user accidentally touching the pressure relief vent 6 or performing improper operation when cleaning the inner liner 3.

[0077] Please see Figure 4 and Figure 5 In some embodiments of this application, the airflow channel 54 includes an air inlet 541 formed on the shroud cover plate 53 and an air outlet 542 formed between the shroud cover plate 53 and the inner liner 3; the pressure relief hole 6 is located on the airflow path 51 between the impeller 52 and the air outlet 542.

[0078] In this embodiment, the airflow channel 54 includes an air inlet 541 formed on the fan cover plate 53 and an air outlet 542 formed between the fan cover plate 53 and the inner liner 3. The air inlet 541 is a through-hole structure penetrating the surface of the fan cover plate 53, forming a hole on the plate body of the fan cover plate 53, connecting the cooking cavity 311 and the heating cavity 312. The air outlet 542 is formed between the fan cover plate 53 and the inner liner 3, and is a gap or opening left between the edge of the fan cover plate 53 and the inner wall of the inner liner 3, also connecting the cooking cavity 311 and the heating cavity 312. The air inlet 541 and the air outlet 542 together constitute the airflow path between the cooking cavity 311 and the heating cavity 312, allowing air exchange between the two cavities through these two openings.

[0079] The pressure relief hole 6 is located on the airflow path 51 between the impeller 52 and the air outlet 542. The pressure relief hole 6 is located on the inner wall of the liner 3 in the area corresponding to the heating chamber 312, specifically on the airflow path between the impeller 52 and the air outlet 542. The airflow generated by the rotation of the impeller 52 flows towards the air outlet 542 within the heating chamber 312, and the pressure relief hole 6 is located within this flow path. After the airflow exits from the impeller 52, it flows through the area where the pressure relief hole 6 is located before reaching the air outlet 542.

[0080] When the oven is operating, the impeller 52 of the hot air circulation fan 5 rotates within the heating chamber 312, driving the air movement within the heating chamber 312. The airflow is heated by passing over the surface of the heating element 4, forming a hot air circulation flow. This hot air circulation flow within the heating chamber 312 in the direction from the impeller 52 towards the air outlet 542. During this flow, the airflow first passes through the area where the pressure relief hole 6 is located, then laterally sweeps across the side opening of the pressure relief hole 6 facing the interior of the heating chamber 312, forming an air curtain inside the pressure relief hole 6. Subsequently, the airflow continues to flow and leaves the heating chamber 312 through the air outlet 542, entering the cooking chamber 311 to heat the food. The air within the cooking chamber 311 can then return to the heating chamber 312 through the air inlet 541, where it is again drawn in and driven by the impeller 52, forming a cycle. The air outlet 542 is the outlet for the hot circulating airflow from the heating chamber 312 into the cooking chamber 311, while the air inlet 541 is the inlet for air to return from the cooking chamber 311 to the heating chamber 312. The hot circulating airflow generated in the heating chamber 312 enters the cooking chamber 311 through the air outlet 542, and the air that has completed heat exchange flows back to the heating chamber 312 through the air inlet 541, forming an orderly unidirectional or main-direction circulation, avoiding mutual interference between the inlet and outlet airflows, and improving the heat circulation efficiency.

[0081] The pressure relief hole 6 is located on the airflow path 51 between the impeller 52 and the outlet 542, meaning that the pressure relief hole 6 is in the flow section after the hot circulating airflow is discharged from the impeller 52 and before it leaves the heating chamber 312 through the outlet 542. The airflow in this section has not yet been affected by the throttling or diffusion of the outlet 542, resulting in a relatively concentrated flow velocity and high dynamic pressure. The pressure relief hole 6 is located in this position, allowing for a larger airflow velocity across the orifice, which is beneficial for forming a more stable and relatively strong air curtain inside the pressure relief hole 6. This air curtain has a more significant effect on suppressing the leakage of gas from the chamber under low-pressure conditions, thereby further reducing heat loss under unnecessary conditions while maintaining the necessary pressure relief capacity.

[0082] The pressure relief hole 6 is located on the inner wall of the heating cavity 312, between the impeller 52 and the air outlet 542. Since the air outlet 542 is typically formed on the edge of the fan cover 53, the pressure relief hole 6 is located on the inner wall of the inner liner 3 between the impeller 52 and the edge of the fan cover 53. This location is within the shielding area of ​​the fan cover 53, so the user cannot directly observe the pressure relief hole 6 when opening the oven door. The pressure relief hole 6 is hidden behind the fan cover 53, maintaining the visual integrity of the inner liner 3.

[0083] Please see Figure 4 In some embodiments of this application, a second space 11 is provided between the shell 1 and the inner liner 3. The second space 11 includes a top cavity 111 located between the top wall of the inner liner 3 and the top wall of the shell 1. The oven also includes a cooling fan 7 and a cooling channel 71. One end of the cooling channel 71 is connected to the outlet of the cooling fan 7, and the other end is connected to the outside of the oven. The inlet of the cooling fan 7 is connected to the top cavity 111. The pressure relief mechanism also includes a pressure relief channel 61. One end of the pressure relief channel 61 is connected to the pressure relief hole 6, and the other end extends into the top cavity 111 and is connected to the top cavity 111.

[0084] In this embodiment, a second space 11 exists between the shell 1 and the inner liner 3. The second space 11 is a sandwich region formed by the outer wall surface of the inner liner 3 and the inner wall surface of the shell 1, surrounding the inner liner 3. Since the inner liner 3 is disposed inside the shell 1 and there is a gap between them, this gap constitutes the main part of the second space 11. The second space 11 includes a top cavity 111 located between the top wall of the inner liner 3 and the top wall of the shell 1. The top cavity 111 is the portion of the second space 11 located above the top of the inner liner 3, with its lower boundary being the outer surface of the top wall of the inner liner 3, its upper boundary being the inner surface of the top wall of the shell 1, and its surroundings being connected to other areas of the second space 11 or defined by other structural components. The top cavity 111 constitutes a relatively independent cavity region between the top of the inner liner 3 and the top of the shell 1.

[0085] The oven in this embodiment also includes a cooling fan 7 and a cooling channel 71. The cooling fan 7 is a fan device for driving airflow, with its inlet connected to the top cavity 111 and its outlet connected to one end of the cooling channel 71. The other end of the cooling channel 71 is connected to the outside of the oven. An airflow passage is established between the inlet of the cooling fan 7 and the top cavity 111, allowing air inside the top cavity 111 to be drawn in by the cooling fan 7. The outlet of the cooling fan 7 is connected to the cooling channel 71, which guides the gas discharged by the cooling fan 7 to the environment outside the oven shell 1. Thus, the cooling fan 7, the top cavity 111, and the cooling channel 71 together constitute an airflow discharge path from the top cavity 111 to the outside of the oven.

[0086] The pressure relief mechanism also includes a pressure relief channel 61. The pressure relief channel 61 is a gas flow pipe or channel structure independent of the pressure relief hole 6. One end of the pressure relief channel 61 communicates with the pressure relief hole 6, and the other end extends into and communicates with the top cavity 111. The pressure relief hole 6 is located on the wall of the inner liner 3, connecting the first space 31 with the external area of ​​the inner liner 3. One end of the pressure relief channel 61 is connected to the outer opening of the pressure relief hole 6, and the other end extends upward and opens into the interior of the top cavity 111. Thus, the pressure relief hole 6 and the pressure relief channel 61 together form a gas flow path from the first space 31 to the top cavity 111. Gas inside the first space 31 can sequentially enter the top cavity 111 through the pressure relief hole 6 and the pressure relief channel 61.

[0087] In this embodiment, the operation of the cooling fan 7 is not only used to dissipate heat from the top cavity 111 and related electronic components, but the negative pressure environment formed in the top cavity 111 during its operation can also be used to assist in the depressurization of the first space 31. Specifically, the other end of the depressurization channel 61 extends into the top cavity 111. When the cooling fan 7 is running, the air in the top cavity 111 is continuously drawn in and discharged to the outside of the oven, creating a negative pressure state in the top cavity 111. This negative pressure is transmitted to the outer opening of the depressurization hole 6 through the depressurization channel 61, creating a certain suction effect on the depressurization hole 6. When the pressure inside the first space 31 increases and gas needs to be discharged, this suction effect can provide auxiliary power for the flow of gas through the depressurization hole 6 and the depressurization channel 61, thereby facilitating the depressurization process. This method of using the cooling fan 7 to assist in depressurization does not require an additional independent exhaust device or active control valve; it can be achieved simply through the connection between the depressurization channel 61 and the top cavity 111, resulting in a relatively simple structure.

[0088] The aforementioned method of using the cooling fan 7 to assist in pressure relief is well-suited to the conventional control logic of the hot air circulation fan 5 and the cooling fan 7 in the oven. In common oven control strategies, the hot air circulation fan 5 typically operates at a higher speed during the initial stage after the oven starts up, in order to quickly agitate the air in the first space 31, promote even heat distribution, and shorten preheating time. However, once the oven enters the high-temperature operating stage and the cavity temperature stabilizes near the set value, the speed of the hot air circulation fan 5 is usually reduced to minimize excessive drying of the food surface and reduce energy consumption and noise. Meanwhile, the operating logic of the cooling fan 7 is the opposite. In the initial stage of oven startup, the temperature in the second space 11 and the top cavity 111 is low, and the need for heat dissipation has not yet materialized; therefore, the cooling fan 7 is usually stopped or operates at a lower speed. As the cooking process continues, the temperature of the second space 11 and the top cavity 111 gradually increases due to heat conduction and radiation. When the temperature reaches a preset threshold, the cooling fan 7 starts and runs at a high speed to forcibly draw in the hot air from the top cavity 111 and exhaust it to the outside of the oven, thus achieving heat dissipation protection for the relevant areas. It can be seen that the heat circulation fan 5 and the cooling fan 7 exhibit opposite speed change trends at different operating stages, a trend that matches to a certain extent the changing pattern of pressure relief demand in this embodiment.

[0089] Please see Figure 6 In the initial stage after the oven starts, the temperature in the first space 31 is still at a low level, and the pressure increase caused by the thermal expansion of air inside the cavity is relatively limited, so the need for pressure relief is relatively small. At the same time, the temperature in the second space 11 and the top cavity 111 is also low, and the need for heat dissipation has not yet appeared. The cooling fan 7 is usually stopped or running at a low speed. In this stage, in order to quickly improve the temperature uniformity in the first space 31 and shorten the preheating time, the hot air circulation fan 5 is set to run at a higher speed according to the conventional control logic. The high speed of the hot air circulation fan 5 increases the airflow velocity discharged by the impeller 52, and the dynamic pressure of the hot air circulation flowing along the airflow path 51 in the heating cavity 312 is significantly increased. When this high-speed hot air circulation flows through the inner orifice of the pressure relief hole 6, it sweeps across the orifice at a faster speed, and the dynamic pressure of the air curtain formed at the orifice is higher, which correspondingly enhances the ability to suppress the leakage of gas from the cavity. Since the cooling fan 7 is not running or at a low speed, no obvious negative pressure environment is formed in the top cavity 111, and the suction effect at the outlet end of the pressure relief channel 61 is weak. Under this condition, the strong air curtain inside the pressure relief hole 6 becomes the dominant factor in controlling gas leakage. The gas inside the cavity is difficult to break through the air curtain barrier at lower pressure, and the pressure relief hole 6 is in a relatively tight, quasi-closed state. The rate at which heat is lost from the first space 31 through the pressure relief path is suppressed to a low level, effectively maintaining the heat inside the cavity. This facilitates the rapid heating of the first space 31 to the set temperature, improving preheating efficiency and reducing ineffective energy consumption.

[0090] Please see Figure 7 As the cooking process progresses, the temperature inside the first space 31 continues to rise and enters a relatively high-temperature working stage. At this time, the air inside the cavity further expands, and the gas produced by the evaporation of moisture from the food and the decomposition of oil causes the pressure inside the cavity to gradually accumulate, increasing the need for pressure relief. At the same time, the temperature of the second space 11 and the top cavity 111 also rises to a level requiring forced heat dissipation due to continuous heat conduction and heat radiation. According to conventional control logic, the cooling fan 7 usually starts operating according to the preset temperature threshold at this stage and exhausts the top cavity 111 for heat dissipation at a higher speed. The operation of the cooling fan 7 creates a relatively obvious negative pressure environment inside the top cavity 111. This negative pressure is transmitted to the outer opening of the pressure relief hole 6 through the pressure relief channel 61, creating a certain suction effect on the pressure relief hole 6. In the same stage, since the temperature inside the first space 31 has stabilized near the set value, the speed of the heat circulation fan 5 is reduced to a medium or low level according to conventional control logic to reduce the excessive drying effect on the surface of the food and reduce energy consumption. The reduction in the rotational speed of the hot air circulation fan 5 correspondingly decreases the velocity of the hot air circulation within the heating cavity 312. This reduces the lateral airflow velocity flowing through the inner orifice of the pressure relief hole 6, thus weakening the dynamic pressure of the resulting air curtain. Under these conditions, the air curtain's suppressive ability inside the pressure relief hole 6 is reduced, while the negative pressure suction effect generated by the operation of the cooling fan 7 on the outside is relatively enhanced. When the pressure inside the cavity increases to a certain level, the driving force for gas discharge and the suction force of the external negative pressure work together to overcome the weakened air curtain barrier relatively smoothly, allowing the gas to be discharged into the top cavity 111 through the pressure relief hole 6 and pressure relief channel 61, and then discharged outside the oven with the cooling airflow. During this stage, the pressure relief function is effectively implemented, allowing excess gas inside the cavity to be discharged in a timely manner, preventing excessive pressure buildup.

[0091] As can be seen from the above process, the concept of using the cooling fan 7 to assist in pressure relief in this embodiment achieves a good synergistic effect with the conventional control logic of the hot circulation fan 5 and the cooling fan 7. In the initial stage, the pressure relief demand is small and the heat dissipation demand is low. The hot circulation fan 5 operates at high speed to form a strong air curtain. The cooling fan 7 stops or operates at low speed without introducing additional suction. The strong suppression effect of the air curtain helps to reduce heat leakage and support rapid temperature rise. In the high-temperature stage, the pressure relief demand increases and the heat dissipation demand becomes apparent. The speed of the hot circulation fan 5 decreases, which appropriately weakens the air curtain. The cooling fan 7 operates at high speed to form negative pressure in the top cavity 111 and provides auxiliary suction. Together, they facilitate a relatively smooth pressure relief and exhaust process. The establishment of this synergistic relationship does not rely on additional sensor signals or complex control algorithms to specifically coordinate the operation of the two fans. Instead, it is based on the correspondence between the speed changes of the two fans naturally generated when they operate according to their conventional control logic and the pressure relief demand. The existence of this correspondence enables this embodiment to achieve dynamic adjustment of the pressure relief process through the combination of structural layout and the normal operating characteristics of the fan, without adding active control valves and corresponding control units.

[0092] Furthermore, the pressure relief channel 61 guides the outlet of the pressure relief hole 6 from the directly open area of ​​the outer wall of the inner liner 3 to the interior of the top cavity 111, preventing the high-temperature gas discharged from the pressure relief from directly entering other areas of the second space 11. The second space 11 typically houses electrical wiring, control components, and other temperature-sensitive parts. If the pressure relief gas were directly discharged into the second space 11, it could cause thermal effects on these components. The pressure relief channel 61 concentrates the pressure relief gas to the top cavity 111, which is directly connected to the inlet of the cooling fan 7. After entering the top cavity 111, the pressure relief gas is immediately drawn away by the cooling fan 7 and discharged outside the oven, reducing the retention and diffusion of high-temperature gas within the second space 11 and helping to control the temperature rise within the second space 11.

[0093] The extension path of the pressure relief channel 61 creates a gas flow distance of a certain length between the pressure relief hole 6 and the top cavity 111. During the gas flow within the pressure relief channel 61, heat exchange occurs with the channel wall, resulting in a certain degree of temperature reduction. This cooling effect ensures that the temperature of the gas ultimately entering the top cavity 111 and contacting the cooling fan 7 is lower than when it first exits from the first space 31. This helps control the gas temperature at the inlet of the cooling fan 7, reducing the potential impact of high-temperature gas on the operating performance and lifespan of the cooling fan 7.

[0094] In some embodiments of this application, a heat insulation member 72 is provided in the top cavity 111, which divides the top cavity 111 into a lower cavity 1112 near the top of the inner liner 3 and an upper cavity 1111 away from the top of the inner liner 3; a heat dissipation fan 7 is disposed on the heat insulation member 72, and the inlet of the heat dissipation fan 7 is connected to the upper cavity 1111; a pressure relief channel 61 is formed in the heat insulation member 72, and the other end of the pressure relief channel 61 extends to the upper cavity 1111 to communicate with the upper cavity 1111.

[0095] In this embodiment, a heat insulation component 72 is provided inside the top cavity 111. The heat insulation component 72 is a plate-shaped or layered component with heat insulation function, disposed in the internal space of the top cavity 111. The heat insulation component 72 divides the top cavity 111 into a lower cavity 1112 near the top of the inner liner 3 and an upper cavity 1111 away from the top of the inner liner 3. The lower cavity 1112 is located below the heat insulation component 72, with its lower boundary being the outer surface of the top wall of the inner liner 3 and its upper boundary being the lower surface of the heat insulation component 72. The upper cavity 1111 is located above the heat insulation component 72, with its lower boundary being the upper surface of the heat insulation component 72 and its upper boundary being the inner surface of the top wall of the shell 1. The arrangement of the heat insulation component 72 divides the originally single space of the top cavity 111 into two relatively independent sub-cavities that are interconnected by a specific path. The heat insulation component 72 itself has a certain heat barrier capability, which can reduce the heat conduction from the lower cavity 1112 to the upper cavity 1111, thereby suppressing the influence of the high temperature at the top of the inner liner 3 on the internal temperature of the upper cavity 1111 to a certain extent.

[0096] A cooling fan 7 is mounted on the heat insulation component 72. The cooling fan 7 is fixed to the plate of the heat insulation component 72, rather than being suspended within the top cavity 111 or elsewhere. A pressure relief channel 61 is formed within the heat insulation component 72. The pressure relief channel 61 is no longer a separately installed pipe component, but is directly formed or shaped inside the body of the heat insulation component 72. One end of the pressure relief channel 61 communicates with the pressure relief hole 6, and the other end extends to and communicates with the upper cavity 1111. The pressure relief channel 61 extends inside the heat insulation component 72, utilizing the thickness of the heat insulation component 72 itself to form a gas flow path.

[0097] When the oven is operating, the gas inside the first space 31 enters the pressure relief channel 61 through the pressure relief hole 6 when pressure relief is required. Since the pressure relief channel 61 is formed inside the heat insulation member 72, the gas is enclosed by the heat insulation member 72 after entering the pressure relief channel 61. The gas flows along the pressure relief channel 61 inside the heat insulation member 72 and is finally discharged into the upper cavity 1111 from the outlet at the other end of the channel. The pressure relief gas entering the upper cavity 1111 mixes with the original air in the upper cavity 1111, and is then drawn in from the inlet by the heat dissipation fan 7 installed on the heat insulation member 72, and discharged to the outside of the oven through the heat dissipation channel 71.

[0098] The upper cavity 1111 serves as the inlet chamber for the cooling fan 7, and its internal ambient temperature is significantly lower than that of the lower cavity 1112. This helps to provide a relatively suitable operating temperature environment for the cooling fan 7 and its surrounding electronic components. After the depressurized gas is discharged into the upper cavity 1111, it mixes with the relatively cool air inside the upper cavity 1111, further reducing the gas temperature. Subsequently, it is drawn away and discharged by the cooling fan 7, reducing the high-temperature impact on the cooling fan 7.

[0099] Please see Figure 8 In some embodiments of this application, the pressure relief channel 61 includes:

[0100] First section 611; First section 611 is connected to pressure relief hole 6 and extends in the horizontal direction;

[0101] Second section 612; Second section 612 is connected to first section 611 and extends upward.

[0102] In this embodiment, the pressure relief channel 61 includes a first section 611 and a second section 612. The overall structure of the pressure relief channel 61 is formed by connecting these two sections one after the other, creating a complete gas flow path extending from the pressure relief hole 6 to the top cavity 111. The first section 611 is connected to the pressure relief hole 6 and extends horizontally. The starting end of the first section 611 is directly connected to the outer opening of the pressure relief hole 6, and the gas enters the first section 611 after being discharged from the pressure relief hole 6. The extension direction of the first section 611 is horizontal, that is, its axis or main extension trajectory is approximately parallel to the horizontal plane or at a small angle. After extending a certain distance horizontally, the end of the first section 611 is connected to the second section 612. Since the first section 611 is arranged horizontally, the flow direction of the gas in this section is mainly horizontal. During the oven cooking process, the gas entering the pressure relief hole 6 and the pressure relief channel 61 along with the pressure relief gas may contain trace amounts of oil fumes, grease particles, or water vapor. When these substances enter the first section 611 with the gas, the gas velocity is relatively low in this section because it extends horizontally and the flow direction is perpendicular to the direction of gravity. Liquid or solid particles entrained in the gas are not easily carried upwards by the airflow, but tend to deposit or remain in the bottom region of the first section 611 under the influence of gravity. The horizontal extension of the first section 611 provides a space for these particles to temporarily store and accumulate, preventing them from immediately entering subsequent sections with the airflow, thereby reducing the amount of liquid or solid substances migrating towards subsequent sections and the top cavity 111.

[0103] The second section 612 is connected to the first section 611 and extends upwards. The starting end of the second section 612 is connected to the ending end of the first section 611, receiving gas from the first section 611. The extension direction of the second section 612 is upward, meaning its axis or main extension trajectory has a significant vertical component, opposite to or at a certain angle to the direction of gravity. After the gas enters the second section 612 from the first section 611, the flow direction changes from predominantly horizontal to predominantly upward, flowing upwards along the second section 612 and eventually reaching the outlet at the other end of the pressure relief channel 61. Because the second section 612 extends upwards, the gas needs to overcome gravity to move upwards within this section. This upward-extending path shape makes it more difficult for liquid and solid particles deposited or remaining in the first section 611 to be carried by the airflow into the second section 612 and continue to be transported upwards. Even if some particles are lifted up by airflow disturbance within the first section 611, they are more likely to settle back to the bottom of the first section 611 or fall back down along the wall of the second section 612 when they enter the upwardly extending second section 612, due to gravity. Therefore, the upward extension of the second section 612 further hinders the transport of non-gaseous substances to the downstream of the pressure relief channel 61 and the top cavity 111, thus playing a certain role in interception and backflow.

[0104] During the actual operation of the oven, when the internal pressure of the first space 31 increases and the gas breaks through the air curtain inside the pressure relief hole 6 and is discharged outward, the gas first enters the first section 611, which is directly connected to the pressure relief hole 6. The gas flows horizontally in the first section 611 at a relatively slow speed. Trace amounts of oil fumes, grease particles, or condensed water vapor that may be carried in the gas begin to settle towards the bottom of this section due to gravity. Because the first section 611 extends horizontally, these settled substances are not immediately pushed further by the airflow but gradually accumulate within the first section 611. When the gas continues to flow into the second section 612, the flow direction changes to upward. The gas needs to overcome gravity to move upward, but the liquid and solid particles that have already settled or are settling in the first section 611 are difficult to rise with the airflow into the second section 612 due to gravity. Some particles may adhere to the wall surface at the junction of the first section 611 and the second section 612, and flow back to the bottom of the first section 611 under the influence of gravity or the flushing action of subsequent condensed liquid. After the successive action of the first section 611 and the second section 612, the gas that is finally discharged upward into the top cavity 111 through the second section 612 has a lower content of non-gaseous substances compared to when it was just discharged from the pressure relief hole 6.

[0105] The horizontal extension length of the first section 611 and the upward extension height of the second section 612 can be set according to the actual product's spatial layout and performance requirements. The horizontal extension length of the first section 611 determines the size of the space available for particle deposition. If the length is too short, the deposition space will be insufficient, and particles will easily be carried directly into the second section 612 by the airflow. If the length is too long, it may increase gas flow resistance and place higher demands on the space at the rear of the oven.

[0106] Please see Figure 8 In some embodiments of this application, the pressure relief channel 61 further includes a third section 613, which is connected to the second section 612. The third section 613 is bent relative to the second section 612 and extends obliquely upward.

[0107] In this embodiment, the pressure relief channel 61 further includes a third section 613. The third section 613 is connected to the second section 612, and the third section 613 bends relative to the second section 612 and extends obliquely upward. The third section 613 is a channel section further added on the basis of the first section 611 and the second section 612. Its starting end is connected to the end of the second section 612, receiving the gas flowing upward from the second section 612. There is a bend transition between the third section 613 and the second section 612, that is, the extension direction of the third section 613 is not a natural continuation of the extension direction of the second section 612, but the direction changes at the connection point. The third section 613 bends and extends at a certain angle to the second section 612. The extension direction of the third section 613 is obliquely upward, that is, its axis or main extension trajectory has both an upward vertical component and a horizontal component in a certain lateral direction, presenting an overall obliquely upward extension shape.

[0108] The bend in the third section 613 relative to the second section 612 forces the airflow to undergo a directional change when entering the third section 613 from the second section 612. The gas flows upwards within the second section 612, but upon reaching the junction of the second and third sections 613, it is guided by the bend in the wall of the third section 613 and forced to change direction, continuing to flow obliquely upwards along the third section 613. During this change in direction at the bend, the velocity distribution and flow state are disturbed to some extent. If trace amounts of liquid or solid particles carried by the airflow remain, they are unlikely to completely follow the abrupt change in direction due to inertia when passing through the bend. Some particles may collide with the wall at the bend, adhering to it or sliding down after losing momentum. The bend structure thus plays a role in separating and intercepting residual particles in the airflow, further reducing the particle content entering the third section 613 and subsequent paths.

[0109] The third section 613 extends obliquely upwards, with an upward vertical component in its extension direction. Due to this upward component, gas flow within the third section 613 still needs to overcome gravity, a characteristic that continues the obstructive effect of the upward extension of the second section 612 on particle transport. Simultaneously, the oblique upward extension of the third section 613, rather than its vertical upward extension, results in a certain inclination angle on the channel wall. When liquid substances (such as condensate or liquefied grease) adhere to the wall surface within the second section 612 or at bends and flow downwards due to gravity, these liquid substances can flow downwards along the inclined wall surface of the third section 613, pass through the bends into the second section 612, and continue flowing back along the wall surface of the second section 612 to the first section 611. The inclined wall surface provides a continuous guiding surface for the gravitational backflow of liquid substances, making the backflow process smoother and reducing the retention and accumulation of liquid substances within the channel. If the third section 613 extends vertically upwards, the liquid material may drip directly due to the vertical wall surface when flowing downwards, and may be carried upwards again by the rising airflow during the dripping process. The wall surface extending obliquely upwards allows the liquid material to flow downwards in a way that adheres to the wall, resulting in a more stable return path and less interference from the rising airflow.

[0110] During the actual operation of the oven, the gas flows sequentially through the first section 611, the second section 612, and the third section 613. The first section 611 extends horizontally, where particles entrained in the gas are initially deposited due to gravity. The second section 612 extends upward, and as the particles move upward, they are hindered by gravity, causing some to settle back into the first section 611. The remaining gas, which continues upward with the airflow into the second section 612, undergoes a bend and deflection when entering the third section 613 at the end of the second section 612. Residual trace particles in the airflow may be intercepted by the wall at the bend. The gas then flows obliquely upward along the third section 613, eventually exiting from the end of the third section 613 into the top cavity 111. In this process, the horizontal deposition in the first section 611, the upward obstruction in the second section 612, the inertial separation at the bend, and the oblique upward guiding and recirculation in the third section 613 together constitute a multi-layered interception and recirculation mechanism for non-gaseous substances in the depressurized gas. After the sequential action of these three sections, the gas is finally discharged into the top cavity 111. The content of oil fumes, grease particles and water vapor is effectively controlled, which helps to reduce the adhesion and accumulation of these substances on the inner wall of the top cavity 111, the impeller 52 of the cooling fan 7 and the heat dissipation channel 71.

[0111] Please see Figure 9In some embodiments of this application, the second space 11 further includes a rear cavity 112 located between the rear wall of the inner liner 3 and the rear wall of the shell 1; a first gap 113 is provided between the heat insulation member 72 and the rear wall of the shell 1, the rear cavity 112 and the upper cavity 1111 are connected through the first gap 113, the first section 611 and the second section 612 are located in the rear cavity 112, and the second section 612 extends from the first gap 113 to the upper cavity 1111, and the third section 613 is located in the upper cavity 1111 and extends from the first gap 113 toward the inlet direction of the cooling fan 7.

[0112] In this embodiment, the second space 11 further includes a rear cavity 112 located between the rear wall of the inner liner 3 and the rear wall of the shell 1. The rear cavity 112 is a vertical interlayer region between the rear wall of the inner liner 3 and the rear wall of the shell 1, extending along the height direction of the rear wall of the inner liner 3. A first gap 113 is provided between the heat insulation member 72 and the rear wall of the shell 1, which connects the rear cavity 112 to the upper cavity 1111. A first section 611 and a second section 612 of the pressure relief channel 61 are arranged in the rear cavity 112, wherein the first section 611 communicates with the pressure relief hole 6 and extends horizontally, and the second section 612 communicates with the first section 611 and extends upward. The second section 612 extends upward along the rear cavity 112 to the rear edge of the heat insulation member 72 and enters the upper cavity 1111 through the first gap 113. The third section 613 is located inside the upper cavity 1111, starting from the first interval 113 and extending obliquely upward toward the inlet of the cooling fan 7.

[0113] The first section 611 and the second section 612 are positioned within the rear cavity 112, making full use of the vertically distributed space behind the inner liner 3. The rear cavity 112 is adjacent to the rear wall of the inner liner 3. This area experiences higher temperatures during oven operation, which helps maintain the oil fumes and grease particles entering the pressure relief channel 61 at a higher temperature, reducing condensation and adhesion at the front of the channel. The rear cavity 112 has ample vertical space to accommodate the horizontal extension of the first section 611 and the upward extension of the second section 612, allowing the pressure relief channel 61 to be raised from the pressure relief hole 6 to the top cavity 111 without occupying top or other space.

[0114] The third section 613 is located within the upper cavity 1111 and extends obliquely upwards, with its inclination pointing towards the area where the inlet of the cooling fan 7 is located. This arrangement allows the outlet of the pressure relief channel 61 to be close to the suction core area of ​​the cooling fan 7. The negative pressure generated within the upper cavity 1111 during the operation of the cooling fan 7 can act more directly on the outlet of the third section 613, thereby enhancing the auxiliary suction effect of the entire pressure relief channel 61. At the same time, the inclined wall of the third section 613 provides a guiding path for any condensate that may be generated to flow back towards the first interval 113. The liquid can flow downwards along the inclined wall, enter the second section 612 through the first interval 113, and continue to flow back, reducing accumulation within the upper cavity 1111.

[0115] In some embodiments of this application, the distance between the third section 613 and the inlet of the cooling fan 7 is usually less than or equal to 200 mm to ensure that the cooling fan 7 generates sufficient negative pressure on the pressure relief channel 61.

[0116] Please see Figure 10 In some embodiments of this application, the distance d between the pressure relief hole 6 and the heating element 4 is 15mm to 40mm, so as to use the heat of the heating element 4 to pyrolyze the oil stains in the first section 611.

[0117] In this embodiment, the distance between the pressure relief hole 6 and the heating element 4 is limited to 15mm to 40mm. This distance range refers to the linear spatial distance between the location of the pressure relief hole 6 on the inner wall of the inner liner 3 and the heating element 4. The pressure relief hole 6 penetrates the inner wall of the inner liner 3, with its inner opening facing the interior of the heating cavity 312, where the heating element 4 is also located. The distance between the pressure relief hole 6 and the heating element 4 determines the thermal environment of the inlet area of ​​the pressure relief hole 6, directly affecting the temperature of the gas entering the pressure relief channel 61 and the pyrolysis effect of the oil stains in the first section 611.

[0118] The pressure relief vent 6 is located on the rear wall of the inner cavity 3, corresponding to the heating chamber 312, and situated on the airflow path 51 between the impeller 52 and the airflow channel 54. The heating element 4, typically arranged around the impeller 52, is one of the hottest components inside the oven. During cooking, the surface temperature of the heating element 4 can reach several hundred degrees Celsius, creating a high-temperature zone around it due to heat radiation and convection. The distance between the pressure relief vent 6 and the heating element 4 determines the specific location of the pressure relief vent 6 inlet within this high-temperature zone. The closer the distance, the higher the ambient temperature at the pressure relief vent 6 inlet, and the higher the temperature of the gas entering the pressure relief channel 61. Conversely, the greater the distance, the greater the influence of the surrounding cooler air on the ambient temperature at the pressure relief vent 6 inlet, resulting in a corresponding decrease in gas temperature.

[0119] The distance d between the pressure relief hole 6 and the heating element 4 is set to 15mm to 40mm, based on the temperature conditions required for the pyrolysis of oil stains in the first section 611. During the cooking process in the oven, the oil in the food evaporates or decomposes due to heat, and the resulting fumes and grease particles move with the gas inside the cavity. When the pressure inside the cavity increases and the gas is discharged outward through the pressure relief hole 6, some of the fumes and grease particles will enter the first section 611 of the pressure relief channel 61 with the airflow. The first section 611 is directly connected to the pressure relief hole 6 and extends horizontally, and is the first area that fumes and grease particles reach after entering the pressure relief channel 61. If these fumes and grease particles are not dealt with in time in the first section 611, they will gradually condense and accumulate, affecting the normal functioning of the pressure relief function.

[0120] When the distance d between the pressure relief hole 6 and the heating element 4 is within the range of 15mm to 40mm, the inlet area of ​​the pressure relief hole 6 is located in the high-temperature radiation zone of the heating element 4. The heat generated by the heating element 4 is transferred to the inlet of the pressure relief hole 6 and the first section 611 through radiation and convection, maintaining the temperature of this area at a high level. During cooking, the temperature inside the heating cavity 312 is already high, and with the direct radiation from the heating element 4, the temperature of the inlet area of ​​the pressure relief hole 6 can typically reach 300℃ to 400℃ or even higher. Under this temperature condition, the oil fumes and grease particles entering the first section 611 undergo a pyrolysis reaction. The main components of the grease break down into small molecule gaseous products and tiny carbon particles at high temperatures. The gaseous products continue to flow along the pressure relief channel 61 with the airflow and are eventually discharged outside the oven. The tiny carbon particles, due to their extremely small size and light mass, can also be carried by the flowing airflow and discharged along the pressure relief channel 61 with the gas, without depositing or adhering within the first section 611. Through this pyrolysis and airflow carrying process, the grease entering the pressure relief channel 61 is transformed into a form that can be discharged with the airflow, reducing the adhesion, condensation and accumulation of liquid grease on the inner wall of the first section 611, which helps to maintain the unobstructed flow of the first section 611.

[0121] If the distance d between the pressure relief hole 6 and the heating element 4 is less than 15 mm, the pressure relief hole 6 is too close to the heating element 4. This excessive distance may cause the temperature at the inlet of the pressure relief hole 6 to become too high, exceeding the temperature resistance limit of the material of the first section 611 or the coating on the inner liner 3, leading to material degradation or deformation. Simultaneously, the excessive distance may cause the pressure relief hole 6 to penetrate too deeply into the high-temperature core area of ​​the heating element 4. The formation of the air curtain in this area may be affected by physical obstruction or thermal disturbance from the heating element 4, potentially impacting the stability of the air curtain and its ability to suppress unnecessary pressure relief. Furthermore, excessively high temperatures may cause the grease to undergo violent pyrolysis upon entering the first section 611, resulting in the concentrated release of a large amount of gaseous products and carbon particles within a short period, causing some disturbance to the stability of the airflow within the channel. If the distance d between the pressure relief hole 6 and the heating element 4 is greater than 40 mm, the pressure relief hole 6 is too far from the heating element 4. The inlet area of ​​the pressure relief hole 6 extends beyond the main high-temperature radiation zone of the heating element 4. The ambient temperature in this area primarily depends on the average air temperature within the heating cavity 312, rather than the direct radiation from the heating element 4. In this situation, the temperature at the inlet of the pressure relief hole 6 and within the first section 611 may be insufficient for the oil fumes and grease particles to undergo a complete pyrolysis reaction. After entering the first section 611, the grease may remain in a liquid or viscous state due to insufficient temperature, resulting in an incomplete or absent pyrolysis reaction. This liquid grease gradually condenses and adheres to the relatively cool inner wall of the first section 611, accumulating with each use and potentially affecting the normal operation of the pressure relief function.

[0122] In some embodiments of this application, the length of the first section 611 is controlled between 5mm and 10mm. The first section 611 is the initial section in the pressure relief channel 61 that is directly connected to the pressure relief hole 6 and extends in the horizontal direction. Its length determines the available space for deposition and pyrolysis of oil fumes and grease particles after they enter the pressure relief channel 61.

[0123] When the length of the first section 611 exceeds 10 mm, the horizontal extension distance of the first section 611 is too long, and its distal region, far from the pressure relief hole 6, exceeds the effective range of the high-temperature radiation from the heating element 4. The temperature at the inlet of the pressure relief hole 6 is high due to its proximity to the heating element 4, but the ambient temperature gradually decreases as the first section 611 extends away from the pressure relief hole 6. When the temperature at the distal end of the excessively long first section 611 drops to a level insufficient for sufficient pyrolysis of the grease, the grease and fumes entering this area cannot be effectively converted into gaseous products and remain in a liquid or viscous state within the channel. This unpyrolyzed grease gradually condenses and adheres to the cooler wall surface at the distal end of the first section 611, increasing the risk of channel blockage.

[0124] When the length of the first section 611 is less than 5 mm, the horizontal extension distance of the first section 611 is too short. The first section 611, as the first residence area for oil fumes and grease particles after entering the pressure relief channel 61, provides a certain temporary storage and buffer space for the particles in its horizontal extension. When the first section 611 is too short, this temporary storage space is insufficient, and the oil fumes and grease particles entering the pressure relief channel 61 are directly carried into the second section 612 by the airflow before completing sufficient pyrolysis and sedimentation within the first section 611. When the airflow is unstable or the pressure fluctuation within the cavity is large, the gas in the second section 612 may flow backwards due to insufficient buffer distance, carrying the unpyrolyzed grease back towards the inlet direction of the pressure relief hole 6, posing a risk of grease flowing back into the first space 31.

[0125] In some embodiments of this application, the diameter of the pressure relief hole 6 and the pressure relief channel 61 is typically greater than or equal to 8 mm to ensure that they meet the pressure relief requirements.

[0126] Please continue reading. Figure 10 In some embodiments of this application, the pressure relief hole 6 is located downstream of the heating element 4 along the airflow path 51, and the pressure relief hole 6 and the heating element 4 are offset from each other on the airflow path 51.

[0127] In this embodiment, the pressure relief hole 6 is located downstream of the heating element 4 along the airflow path 51. The airflow path 51 is the flow trajectory of the hot circulating airflow generated by the hot circulating fan 5 within the heating chamber 312. The airflow is discharged from the impeller 52 along this path, flows through the heating element 4, and continues to flow towards the airflow channel 54. Along the flow direction of the airflow path 51, the heating element 4 is located upstream, and the pressure relief hole 6 is located downstream. This means that the hot circulating airflow is first heated by the heating element 4 before flowing through the area where the pressure relief hole 6 is located. The pressure relief hole 6 is located downstream of the heating element 4, so that the airflow flowing through the inner orifice of the pressure relief hole 6 and forming an air curtain is a high-temperature airflow that has already been heated by the heating element 4, rather than a lower-temperature airflow that has not been heated. This positional relationship ensures that the air curtain is composed of high-temperature airflow. When the pressure inside the chamber increases and the gas breaks through the air curtain and is discharged outward through the pressure relief hole 6, the discharged gas is also a heated high-temperature gas, which helps to provide the temperature conditions required for the pyrolysis of the grease in the first section 611 of the pressure relief channel 61.

[0128] The pressure relief hole 6 and the heating element 4 are offset from each other on the airflow path 51. Within the heating chamber 312, the heating element 4 is typically arranged in a ring or partially encircling manner around the impeller 52, occupying a certain space. After the airflow exits from the impeller 52, it flows through the heating element 4. The heating element 4 itself has a certain pipe diameter and volume, creating a physical obstruction to the airflow. If the pressure relief hole 6 is located directly behind the heating element 4 on the airflow path 51, meaning the pressure relief hole 6 and the heating element 4 completely overlap in their projections along the airflow direction, the heating element 4 will directly block the pressure relief hole 6, preventing the airflow from smoothly reaching the inner opening of the pressure relief hole 6. In this case, the airflow velocity flowing through the inner side of the pressure relief hole 6 will be significantly reduced, weakening the air curtain formation effect, and even making it impossible to form a continuous and stable air curtain. The offset arrangement means that the position of the pressure relief hole 6 on the airflow path 51 is laterally offset from that of the heating element 4 on a plane perpendicular to the airflow direction; the pressure relief hole 6 is not located within the area directly behind and blocked by the heating element 4. After the airflow exits from the impeller 52 and flows through the heating element 4, it can bypass the gaps between the heating elements 4 or the outside of the heating element 4, continuing to flow unobstructed to the inner orifice of the pressure relief hole 6. The staggered arrangement ensures that the hot circulating airflow can sweep laterally across the inner side of the pressure relief hole 6 at a high velocity, thus forming a stable air curtain with a certain dynamic pressure. Simultaneously, since the pressure relief hole 6 is not directly behind the heating element 4, the radiative heat transfer from the heating element 4 to the pressure relief hole 6 will not cause localized overheating due to excessive proximity.

[0129] The pressure relief hole 6 is located downstream of the heating element 4 and offset from it on the airflow path 51. Together, these two elements ensure that the pressure relief hole 6 can receive the high-temperature airflow heated by the heating element 4, while the physical obstruction of the heating element 4 does not hinder the smooth arrival of the airflow or the effective formation of the air curtain. The downstream location guarantees that the gas flowing through the pressure relief hole 6 and entering the pressure relief channel 61 has a high temperature, providing the thermodynamic conditions for the pyrolysis of the grease in the first section 611. The offset arrangement ensures that the flow of the hot circulating airflow inside the pressure relief hole 6 is not directly blocked by the heating element 4, allowing the air curtain to form stably and suppress unnecessary pressure relief. These two elements work together to balance the high-temperature environment required for the self-cleaning of the pressure relief channel 61 with the smooth airflow conditions required for the effective formation of the air curtain.

[0130] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An oven, characterized in that, The oven includes: case; Inner liner; the inner liner has a first space, and the inner liner is disposed within the shell; Heating element; the heating element is disposed within the first space; A hot air circulation fan; the hot air circulation fan is used to drive airflow to generate a hot air circulation flow through the heating element, the hot air circulation flow forming an airflow path in the first space; Pressure relief mechanism; the pressure relief mechanism includes a pressure relief hole penetrating the inner liner, the pressure relief hole being located on the airflow path, and when the hot circulation fan is running, the hot circulation airflow forms an air curtain on the side of the pressure relief hole located in the first space.

2. The oven as described in claim 1, characterized in that, The heat circulation fan includes an impeller; The oven also includes a fan cover plate, which is connected to the inner cavity and divides the first space into a cooking cavity and a heating cavity. The cooking cavity is used to hold food, and the impeller and the heating element are located in the heating cavity. An airflow channel is provided between the cooking cavity and the heating cavity; The airflow path extends between the impeller and the airflow channel, and the pressure relief hole is located in the heating chamber and between the impeller and the airflow channel.

3. The oven as described in claim 2, characterized in that, The airflow channel includes an air inlet formed on the wind cover plate and an air outlet formed between the wind cover plate and the inner liner. The pressure relief hole is located on the airflow path between the impeller and the air outlet.

4. The oven as described in claim 1, characterized in that, A second space exists between the shell and the inner liner, the second space including a top cavity located between the top wall of the inner liner and the top wall of the shell; The oven also includes a cooling fan and a cooling channel. One end of the cooling channel is connected to the outlet of the cooling fan, and the other end is connected to the outside of the oven. The inlet of the cooling fan is connected to the top cavity. The pressure relief mechanism also includes a pressure relief channel, one end of which is connected to the pressure relief hole, and the other end extends into the top cavity and is connected to the top cavity.

5. The oven as described in claim 4, characterized in that, The top cavity is provided with a heat insulation component, which divides the top cavity into a lower cavity near the top of the inner liner and an upper cavity away from the top of the inner liner. The cooling fan is mounted on the heat insulation component, and the inlet of the cooling fan is connected to the upper cavity. The pressure relief channel is formed within the heat insulation component, and the other end of the pressure relief channel extends to the upper cavity to communicate with the upper cavity.

6. The oven as described in claim 5, characterized in that, The pressure relief channel includes: First section; the first section is connected to the pressure relief hole and extends in a horizontal direction; The second segment; the second segment is connected to the first segment and extends upward.

7. The oven as described in claim 6, characterized in that, The pressure relief channel also includes a third section, which is connected to the second section. The third section is bent relative to the second section and extends obliquely upward.

8. The oven as described in claim 7, characterized in that, The second space also includes a rear cavity located between the rear wall of the inner liner and the rear wall of the shell; A first gap exists between the heat insulation component and the rear wall of the housing, and the rear cavity and the upper cavity communicate through the first gap. The first section and the second section are located in the rear cavity, and the second section extends from the first interval to the upper cavity. The third section is located in the upper cavity and extends from the first interval toward the inlet of the cooling fan.

9. The oven as described in any one of claims 6 to 8, characterized in that, The distance between the pressure relief hole and the heating element is 15mm to 40mm, so as to use the heat of the heating element to pyrolyze the oil stains in the first section.

10. The oven as described in claim 9, characterized in that, The pressure relief hole is located downstream of the heating element along the airflow path, and the pressure relief hole and the heating element are offset from each other on the airflow path.

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