Food heater

Abstract

The utility model discloses a food heater which comprises a machine shell, a heating cavity and an exhaust air duct communicated with the heating cavity are arranged in the machine shell, a filtering assembly is arranged at the air outlet end in the exhaust air duct and comprises a fixing frame and a filtering piece arranged on the fixing frame, the fixing frame is provided with air outlet holes communicated with the outside, and the filtering piece is arranged on the fixing frame. The windward side of the filter part is provided with an air inlet hole, the air inlet hole is communicated with the air outlet hole, and the windward side extends upwards in an inclined mode in the air outlet direction. The inclined windward side is arranged, so that the filtering area is increased in a limited mounting space, the amount of gas filtered in unit time can be increased, and the filtering efficiency is improved; the air flow can be guided to quickly reach the surface of the filtering piece, the air flow can cover the whole surface of the filtering piece, the utilization rate of the filtering piece is increased, and meanwhile air exhaust can be smooth; in addition, the transversely flowing air flow is easier to contact with the inclined windward side, and sufficient filtration of the air is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of cooking utensils, specifically to a food heater. Background Technology

[0002] An air fryer is a device that uses hot air to blow away the moisture on the surface of food, making the food similar to deep-frying. Due to the air flow and the heating of the food surface by the hot air, a lot of solid particles and small droplets with a diameter of less than 2.5μm are often generated. These particles can affect human health after being discharged from the heating chamber. Therefore, it is necessary to filter the exhaust air to ensure a clean and healthy indoor environment.

[0003] After a period of use, the adsorption capacity of the filter element decreases, requiring regular replacement to ensure continuous filtration. Some existing air fryers or ovens have filter structures that are difficult to disassemble, hindering user operation and negatively impacting the user experience. Other devices, such as the cooking appliance disclosed in patent CN201711065371.8, have a removable filter device at the top of the cooking cavity. While this device is easy to remove and replace, its location at the top of the cavity means that the rising hot airflow can cause overheating, affecting the filter's lifespan and posing a risk of burns to users. Furthermore, the small contact area between the airflow and the filter limits the amount of gas filtered per unit time, resulting in low filtration efficiency. Utility Model Content

[0004] This invention provides a food heater designed to solve the technical problem of low filtration efficiency caused by the small contact area between the airflow and the filter in existing filtration devices.

[0005] This utility model discloses a food heater, including a housing, a heating cavity and an exhaust duct communicating with the heating cavity, and a filter assembly at the air outlet end of the exhaust duct. The filter assembly includes a fixing frame and a filter element disposed on the fixing frame. The fixing frame has an air outlet hole communicating with the outside. The air inlet hole and the air outlet hole are connected on the windward side of the filter element. The windward side extends upward at an angle along the air outlet direction.

[0006] The food heater of this utility model also has the following additional technical features:

[0007] The mounting bracket includes a first cover body located away from the air outlet of the exhaust duct. The top of the first cover body has a recessed mounting groove. The mounting groove is inclined. The filter element is embedded in the mounting groove. The bottom wall of the mounting groove has a ventilation hole that connects the air inlet and the air outlet.

[0008] The mounting bracket also includes a second cover that communicates with the interior of the first cover. The top of the second cover extends horizontally from the first cover toward the air outlet near the exhaust duct, and the top of the second cover is closed.

[0009] The first cover has a bottom wall, which is hollowed out.

[0010] The second cover has vertically extending sidewalls, and the sidewall facing the air outlet of the exhaust duct is provided with the air outlet.

[0011] The filter assembly has a flat structure, and the thickness of the filter element does not exceed 30mm.

[0012] The angle between the windward side of the filter and the horizontal plane is no greater than 45 degrees.

[0013] The exhaust duct is located below the heating chamber, and a heat dissipation gap is provided between the exhaust duct and the bottom of the heating chamber.

[0014] The filter assembly is detachably installed inside the exhaust duct.

[0015] The filter element is detachably mounted on the mounting bracket.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] 1. This utility model of a food heater, with a filter assembly at the exhaust end of the air duct, purifies the exhaust airflow, preventing harmful particulate matter from affecting human health. Furthermore, the filter element has an inclined windward surface, increasing the filtration area within a limited installation space, thereby increasing the amount of gas filtered per unit time and improving filtration efficiency. The inclined windward surface also facilitates the rapid flow of air to the surface of the filter element, ensuring airflow covers the entire surface and improving its utilization rate, while also ensuring smooth exhaust. The existing filter device disclosed in patent CN201711065371.8 is vertically arranged within the exhaust channel, occupying a large space. Moreover, when the airflow flows downstream, it is not conducive to all airflow passing through the filter device, easily leading to insufficient filtration. In this application, the horizontally flowing airflow more easily contacts the inclined windward surface, which is beneficial for sufficient gas filtration.

[0018] 2. To simplify the installation of the filter element and enhance its stability, the mounting bracket includes a first cover located away from the exhaust duct's outlet. The top of the first cover has a recessed mounting groove. This groove is angled, allowing the filter element to be installed at an angle into the groove, creating an angled windward surface. This facilitates installation and provides a larger contact area between the mounting groove and the filter element, improving the groove's support for the filter element. The bottom wall of the mounting groove has ventilation holes connecting the air inlet and outlet, ensuring reliable exhaust after the airflow passes through the filter element.

[0019] To reduce noise at the airflow outlet, the exhaust channel can be extended to achieve a certain noise reduction effect. In one embodiment, the mounting bracket further includes a second cover that communicates with the interior of the first cover. The interior of the second cover forms an extended exhaust channel, which is beneficial for airflow buffering, can extend the airflow path, reduce the airflow velocity and pressure at the air outlet, thereby improving the noise reduction effect. Furthermore, the top of the second cover is enclosed, which allows airflow to be discharged only from the end of the second cover, ensuring the airflow efficiency at the end.

[0020] To improve the structural strength of the first cover and enhance its stability and reliability in supporting the filter element, the first cover has a bottom wall. This bottom wall can strengthen the supporting effect of the mounting groove on the filter element. Provided that the structural strength meets the requirements, the bottom wall can adopt a hollow structure to save materials.

[0021] 3. Given that the filter element has a large filtration area, if the filter assembly is placed vertically, it will inevitably occupy a large space or increase the height of the machine. In order to solve this problem, the filter assembly of this application adopts a flat structure. By placing it horizontally in the exhaust duct, the installation space can be saved. Moreover, the thickness of the filter element does not exceed 30mm, which is conducive to using exhaust ducts with a smaller height and avoids the whole machine being too tall.

[0022] 4. In order to simultaneously consider airflow guidance, filtration efficiency and overall size, the angle between the windward side of the filter element and the horizontal plane is no greater than 45 degrees. This tilt angle is beneficial for guiding airflow on the windward side and improving filtration efficiency, and can also prevent the filter assembly from becoming too tall, which would make the whole unit taller.

[0023] 5. The exhaust duct of this application is located below the heating chamber, so that the filter assembly is located below the heating chamber. Compared with the filter assembly being located at the top of the heating chamber, the filter assembly is less affected by high temperature, which is beneficial to extending its service life. In addition, a heat dissipation gap is provided between the exhaust duct and the bottom of the heating chamber, which can reduce heat conduction between the heating chamber and the exhaust duct, which is beneficial to lowering the temperature inside the exhaust duct, further extending the service life of the filter assembly, and preventing users from being burned when touching the filter assembly.

[0024] 6. The filter assembly of this application can be detachably installed in the exhaust duct, which solves the problem of difficult disassembly of the filter assembly and facilitates the maintenance and replacement of the filter assembly.

[0025] 7. In order to maintain the long-term effective filtration effect of the filter element, the filter element needs to be replaced regularly. By making the filter element detachable and installed on the fixed frame, users can easily remove the filter element for replacement, which provides operational convenience. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic internal cross-sectional view of a food heater according to one embodiment of this application.

[0028] Figure 2 This is a schematic diagram showing the arrangement of the heating cavity and the exhaust duct in one embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the airflow path within the exhaust duct of this application.

[0030] Figure 4 This is a schematic diagram of the composition structure of a filter component according to one embodiment of this application.

[0031] Figure 5 This is a schematic diagram showing the angle of the windward side of the filter element according to one embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the structure of the fixing frame according to one embodiment of this application.

[0033] Figure label:

[0034] 10. Housing; 11. Heating chamber; 12. Exhaust duct; 121. Opening; 13. Filter assembly; 14. Mounting bracket; 141. Air outlet; 142. First cover; 143. Mounting slot; 144. Ventilation hole; 145. Bottom wall; 146. Second cover; 15. Filter element; 151. Windward side; 16. Heat dissipation gap; 17. Motor; 18. Cooling fan; 19. Exhaust pipe. Detailed Implementation

[0035] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0036] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0038] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 utility model 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 utility model.

[0039] 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, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; 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. However, specifying a direct connection indicates that the two connected entities do not establish a connection relationship through a transitional structure, but are connected solely by a connecting structure to form a whole. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0041] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] like Figures 1 to 6 As shown, this application provides a food heater, including a housing 10. The housing 10 has a heating chamber 11 and an exhaust duct 12 communicating with the heating chamber 11. The exhaust duct 12 has a filter assembly 13 at the air outlet. The filter assembly 13 includes a fixing frame 14 and a filter element 15 disposed on the fixing frame 14. The fixing frame 14 has an air outlet 141 communicating with the outside. The air inlet 151 of the filter element 15 has an air inlet. The air inlet and the air outlet 141 are connected. The air inlet 151 extends upward at an angle along the air outlet direction.

[0043] The food heater of this utility model, with a filter assembly 13 at the air outlet of the exhaust duct 12, can purify the exhaust airflow and prevent harmful particles from being emitted and affecting human health. On this basis, the filter element 15 has an inclined windward surface 151, which increases the filtration area in the limited installation space, thereby increasing the airflow per unit time and improving filtration efficiency. Moreover, the inclined windward surface 151 is conducive to guiding the airflow to quickly reach the surface of the filter element 15, which is conducive to the airflow covering the entire surface of the filter element 15, improving the utilization rate of the filter element 15, and at the same time, it can also make the exhaust smooth.

[0044] By incorporating the filter assembly 13, the gas emitted by the heating chamber 11 during food heating is filtered through the filter assembly 13 to remove fine particles (such as particles with a diameter of less than 2.5 μm), allowing the purified gas to be discharged and thus solving the problem of PM2.5 posing a health hazard. The filter element 15 can be a HEPA filter, capable of adsorbing most particles with a diameter of less than 2.5 μm, providing good filtration and meeting the filtration requirements of this application.

[0045] The existing patent CN201711065371.8 discloses a filter device that is vertically arranged in the exhaust channel, occupying a large space. Furthermore, when the airflow flows downstream, it is not conducive to all airflow passing through the filter device, easily leading to insufficient filtration. For example... Figures 1 to 3As shown, preferably, the filter assembly 13 of this application is arranged laterally within the exhaust duct 12, which saves installation space and facilitates sufficient airflow through the filter assembly 13, improving the filtration effect. Compared to a horizontally arranged windward surface 151, an inclined windward surface 151 has a larger area, which can increase the amount of gas filtered per unit time, thereby improving filtration efficiency. Figure 3 or Figure 6 As shown, the horizontally flowing airflow is more likely to come into contact with the inclined windward surface 151, which is beneficial to the thorough filtration of the gas. The windward surface 151 is provided with an air inlet, which can be the pore structure of the filter element 15 itself. After the airflow passes through the filter element 15, the fine particles are left on the filter element 15, and the purified airflow flows into the fixing frame 14 and is finally discharged from the air outlet 141.

[0046] The advantage of the horizontal arrangement of the filter assembly 13 in this application is that it allows for the use of a lower-height exhaust duct 12, which helps reduce the overall height of the machine and promotes miniaturization. The filter assembly 13 has a flat structure; by optimizing the thickness of the filter element 15, the overall height of the filter assembly 13 can be controlled within a certain range, thus controlling the height of the exhaust duct 12 and preventing the entire machine from becoming too tall. The thickness of the filter element 15 is preferably no more than 30mm.

[0047] Furthermore, such as Figure 5 As shown, the windward surface 151 of the filter element 15 forms an angle θ with the horizontal plane. The larger the angle θ, the greater the height occupied by the filter element 15, which will cause the filter assembly 13 to become taller, and thus the whole machine to become taller. In order to avoid the whole machine being too tall, the height of the filter element 15 needs to be controlled. It is preferable to make the angle θ no greater than 45 degrees. This can meet the height requirements of the whole machine, as well as the requirements of the windward surface 151 to guide the airflow and ensure the contact effect with the gas.

[0048] Since filter element 15 achieves filtration by adsorbing particulate matter, its adsorption capacity gradually decreases with use until it is lost. To maintain a long-lasting and effective filtration effect, users can periodically replace filter element 15 to maintain good filtration performance. Preferably, such as Figure 2 As shown, the filter assembly 13 is detachably installed inside the exhaust duct 12. The exhaust duct 12 is provided with an opening 121, through which the filter assembly 13 can be inserted or removed, solving the problem of difficult disassembly of existing filter devices, making it convenient for users to operate and improving the user experience.

[0049] Furthermore, if the filter element 15 is not removable, the user needs to replace the entire filter assembly 13, which is costly. Preferably, such as Figure 4 As shown, the filter element 15 is detachably mounted on the mounting bracket 14, so the user only needs to remove and replace the filter element 15, which is simple to operate and helps to save costs.

[0050] In a preferred embodiment, the mounting bracket 14 includes a first cover 142 located away from the air outlet of the exhaust duct 12. The top of the first cover 142 has a recessed mounting groove 143. The mounting groove 143 is inclined. The filter element 15 is embedded in the mounting groove 143. The bottom wall 145 of the mounting groove 143 is provided with a ventilation hole 144 that connects the air inlet and the air outlet 141.

[0051] like Figure 4 and Figure 6 As shown, in this embodiment, the filter element 15 is disposed on the outside of the fixing frame 14. The airflow first flows through the filter element 15 and then into the fixing frame 14. Compared to the method where the filter element 15 is disposed inside the fixing frame 14, the airflow encounters less resistance and flows more smoothly when reaching the filter element 15, which is beneficial for the gas to fully contact the filter element 15, thereby improving the filtration effect. With the filter element 15 placed at an angle, one installation method for the filter element 15 is as follows: Figure 4 As shown, the mounting groove 143 for supporting the filter element 15 is also inclined, which allows the mounting groove 143 to form a tight contact with the filter element 15, thereby improving the support effect of the filter element 15. In addition, when the filter element 15 is detachable, its location on the outside of the fixing frame 14 makes it easier to replace.

[0052] It is understood that in other embodiments, the top of the first cover 142 may also be horizontally arranged. In order to support the filter element 15, the top of the first cover 142 is provided with support ribs of different heights to support the filter element 15.

[0053] like Figure 4 As shown, the bottom wall 145 of the mounting groove 143 is provided with a ventilation hole 144, which is connected to the air outlet of the filter element 15 (which may be its own hole structure). After the airflow passes through the filter element 15, it flows into the air duct inside the fixing frame 14 through the ventilation hole 144 and finally flows out from the air outlet 141.

[0054] It is understandable that if the first cover 142 is supported only by its side walls, the supporting force may be insufficient. Furthermore, the presence of ventilation holes 144 weakens its structural strength. Therefore, to ensure the stability and reliability of the first cover 142's support for the filter element 15, in one embodiment, such as... Figure 6 As shown, the first cover 142 also has a horizontally extending bottom wall 145, which can enhance the supporting effect of the mounting groove 143 on the filter element 15 and prevent the filter element 15 from collapsing. Furthermore, the bottom wall 145 can be a closed (closed means that the bottom wall 145 does not have a perforated structure) plate structure, or it can be a hollow structure (the bottom wall 145 has a perforated structure). When a hollow structure is used, materials can be saved while meeting the structural strength requirements.

[0055] In one embodiment, the mounting bracket 14 further includes a second cover 146 communicating with the interior of the first cover 142. The top of the second cover 146 extends horizontally from the first cover 142 toward the air outlet near the exhaust duct 12, and the top of the second cover 146 is closed.

[0056] like Figure 6 As shown, the second cover 146 has an extended exhaust channel inside, which is beneficial for airflow buffering, can extend the airflow path, reduce the airflow velocity and pressure at the air outlet, thereby improving the noise reduction effect; the top of the second cover 146 is closed (i.e., no hole structure is provided), which allows the airflow to be discharged only from the end of the second cover 146, ensuring the air outlet efficiency at the end.

[0057] Furthermore, such as Figure 3 and Figure 6 As shown, the second enclosure 146 has vertically extending sidewalls, and an air outlet 141 is provided on the sidewall facing the air outlet of the exhaust duct 12. Compared to a large-sized opening structure, the air outlet 141 produces less noise during airflow, which is beneficial for noise reduction. Preferably, as... Figure 5 As shown, the air outlet 141 extends downward at an angle along the air outlet direction, which can prevent the air outlet from blowing directly onto the opposite wall or object and causing damage to the wall or object, and prevent the air outlet from blowing onto a person and causing burns when it is angled upward, thus improving the safety of use.

[0058] In a preferred embodiment, the exhaust duct 12 is disposed below the heating chamber 11, and a heat dissipation gap 16 is provided between the exhaust duct 12 and the bottom of the heating chamber 11.

[0059] like Figure 2 As shown, the filter assembly 13 is located below the heating chamber 11. Compared to the filter assembly 13 being located at the top of the heating chamber 11, the filter assembly 13 is less affected by high temperatures, which helps to extend its service life. In addition, a heat dissipation gap 16 is provided between the exhaust duct 12 and the bottom of the heating chamber 11, which can reduce heat conduction between the heating chamber 11 and the exhaust duct 12, which helps to lower the temperature inside the exhaust duct 12, further extending the service life of the filter assembly 13, and also preventing users from being burned when they touch the filter assembly 13.

[0060] As a preferred implementation method, such as Figure 1 and Figure 2As shown, the housing 10 has an airflow drive assembly located on the outside of the heating cavity 11. The airflow drive assembly includes a motor 17 and a cooling fan 18 connected to the output shaft of the motor 17. A cooling duct is provided between the housing 10 and the heating cavity 11. A cooling chamber surrounding the motor 17 and the cooling fan 18 is provided inside the cooling duct. The cooling chamber has an air inlet, and the heating cavity 11 has an air outlet. An exhaust pipe 19 communicating with the cooling chamber is provided at the air outlet. Hot air flowing into the cooling chamber from the air outlet and cold air flowing into the cooling chamber from the air inlet are mixed in the cooling chamber and then flow into the exhaust duct 12.

[0061] Understandably, when the food heater is working, the hot air discharged from the heating chamber 11 enters the heat dissipation chamber through the exhaust pipe 19, and the external air flowing into the heat dissipation duct enters the heat dissipation chamber through the air inlet. After the two parts of air are mixed, the exhaust gas can be cooled down. Compared with the method of directly exhausting the hot air in the cooking chamber in the prior art, it can reduce the temperature of the exhaust position of the casing 10, reduce the risk of the exhaust gas burning the user due to excessive temperature, and prevent the filter component 13 from being affected by excessive temperature, thus affecting its performance and lifespan.

[0062] The technical solutions protected by this utility model are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this utility model. Although this utility model has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A food heater, comprising a housing, wherein a heating chamber and an exhaust duct communicating with the heating chamber are provided inside the housing, and a filter assembly is provided at the air outlet end of the exhaust duct, characterized in that, The filter assembly includes a fixed frame and a filter element disposed on the fixed frame. The fixed frame is provided with an air outlet that communicates with the outside. The air inlet is provided on the windward side of the filter element. The air inlet and the air outlet are connected. The windward side extends upward at an angle along the air outlet direction.

2. A food heater according to claim 1, characterized in that, The mounting bracket includes a first cover body located away from the air outlet of the exhaust duct. The top of the first cover body has a recessed mounting groove. The mounting groove is inclined. The filter element is embedded in the mounting groove. The bottom wall of the mounting groove has a ventilation hole that connects the air inlet and the air outlet.

3. A food heater according to claim 2, characterized in that, The mounting bracket also includes a second cover that communicates with the interior of the first cover. The top of the second cover extends horizontally from the first cover toward the air outlet near the exhaust duct, and the top of the second cover is closed.

4. A food heater according to claim 2, characterized in that, The first cover has a bottom wall, which is hollowed out.

5. A food heater according to claim 3, characterized in that, The second cover has vertically extending sidewalls, and the sidewall facing the air outlet of the exhaust duct is provided with the air outlet.

6. A food heater according to claim 1, characterized in that, The filter assembly has a flat structure, and the thickness of the filter element does not exceed 30mm.

7. A food heater according to claim 1, characterized in that, The angle between the windward side of the filter and the horizontal plane is no greater than 45 degrees.

8. A food heater according to claim 1, characterized in that, The exhaust duct is located below the heating chamber, and a heat dissipation gap is provided between the exhaust duct and the bottom of the heating chamber.

9. A food heater according to claim 1, characterized in that, The filter assembly is detachably installed inside the exhaust duct.

10. A food heater according to claim 1, characterized in that, The filter element is detachably mounted on the mounting bracket.

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