Cooking purification module and cooking utensil

Abstract

The invention discloses a cooking purification module and a cooking utensil, and belongs to the technical field of cooking utensil purification. The cooking purification module disclosed by the invention is applied to the cooking utensil, and can be used for carrying out catalytic oxidation degradation on cooking fume waste gas pollutants. The cooking purification module comprises the base body and the catalytic coating arranged on the surface of the base body, the base body comprises the conductive material, so that an electrothermal effect is achieved, the catalytic coating can be directly heated through electrical impedance heating of the base body after electrification, a catalyst is also heated to the working temperature to obtain catalytic activity, and the whole process is fast in heating response and high in energy efficiency; the catalytic coating and the catalyst are heated more uniformly, local hot spots or cold spots are not easy to form, and the working temperature of the catalyst can be maintained for a long time. The base body of the cooking purification module is further provided with a through hole structure, and purified gas obtained after pollutants in cooking fume are catalytically degraded can be smoothly discharged through the through hole structure.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking appliance purification, and particularly relates to a cooking purification module and a cooking appliance. Background Art

[0002] In recent years, kitchen appliances such as air fryers that are popular among consumers have the advantages of less oil usage, uniform heating, and short baking time. However, similar to traditional kitchen appliances, they also generate a large amount of oil fume waste gas during the cooking process, which contains air pollutants such as VOCs, particulate matter, and odors. These oil fume waste gases are directly discharged into the kitchen environment, polluting the indoor air. Long-term exposure to the oil fume waste gas environment threatens people's physical health.

[0003] To solve the above problems, technicians use thermal catalytic reactions to degrade the pollutants in the oil fume waste gas. However, in traditional endothermic gas-solid heterogeneous catalytic reactions, the heat required for the reactor to carry out the catalytic reaction is usually provided by an external electric heater to ensure that the catalyst undergoes the catalytic reaction at an appropriate temperature. In this way, the heat required for the catalytic reaction in the reactor comes entirely from outside the catalyst, that is, the external electric heater. Therefore, the temperature of the catalytic reaction is limited by the heat conduction process, which easily leads to a long start-up time for the catalytic reactor and uneven heating of the catalytic coating to form local hot spots or cold spots, ultimately resulting in a decrease in the catalytic activity of the catalyst or even an inability to meet the catalytic requirements. Summary of the Invention

[0004] The present invention provides a cooking purification module and a cooking appliance to solve the technical problem that the oil fume waste gas of cooking appliances is directly discharged into the kitchen environment, polluting the indoor air and easily threatening the physical health of users when exposed to the oil fume waste gas environment for a long time.

[0005] To achieve the above object, the present application provides a cooking purification module applied to a cooking appliance. The cooking purification module includes a substrate and a catalytic coating disposed on the surface of the substrate. The substrate includes a conductive material and is provided with a through-hole structure, and the catalytic coating includes a thermal catalyst.

[0006] In some embodiments of the present application, gas can enter the through-hole structure from one surface of the substrate and pass through the through-hole structure to come out from the other surface of the substrate.

[0007] In some embodiments of the present application, the conductive material is used to generate heat through an electrothermal effect when powered on, so that the catalytic coating on the surface of the substrate undergoes a thermal catalytic oxidation reaction.

[0008] In some embodiments of the present application, the conductive material includes at least one of stainless steel, nickel-chromium alloy, PTC heating ceramics, SiC, cast iron, activated carbon, aluminum alloy, copper alloy, aluminized material, and galvanized material.

[0009] In some embodiments of the present application, the substrate further includes a heat-conducting material, and the heat-conducting material includes at least one of stainless steel, nickel-chromium alloy, PTC heating ceramics, SiC, cast iron, activated carbon, aluminum alloy, copper alloy, aluminized material, and galvanized material.

[0010] In some embodiments of the present application, the structure of the substrate includes at least one of a spatial network structure, a foam-like structure, a honeycomb structure, a reel-like structure, and a V-shaped grid structure.

[0011] In some embodiments of the present application, the porosity of the substrate is 10% to 80%;

[0012] and / or, the average pore diameter of the through-hole structure is 500 μm to 5000 μm.

[0013] In some embodiments of the present application, the inner surface of the through-hole structure of the substrate is also provided with the catalytic coating.

[0014] In some embodiments of the present application, the thickness range of the catalytic coating is 10 μm to 2 mm.

[0015] In some embodiments of the present application, the thickness range of the catalytic coating is 20 μm to 1 mm.

[0016] In some embodiments of the present application, the catalyst includes a noble metal element catalyst and / or a metal oxide catalyst, and the noble metal element catalyst and / or the metal oxide catalyst includes at least one of a noble metal element and a transition metal element.

[0017] In some embodiments of the present application, the noble metal element includes at least one of Pt, Rh, Pd, Au, and Ag; and / or, the transition metal element includes at least one of Ce, Cu, Co, Fe, La, Mn, and Ni.

[0018] In some embodiments of the present application, the catalyst includes CeO 2 , CuO, CoO, Co 3 O 4 , Fe 2 O 3 , Fe 3 O 4 , MnO 2 , Mn 2 O 3 , Mn 3 O 4 , NiO, LaMn x Co 1-x O 3 , CuFe 2 O4 , CuMn 2 O 4 , Cu 1.5 Mn 1.5 O 4 at least one of

[0019] In some embodiments of the present application, the catalyst includes a noble metal catalyst, and the mass percentage content of the noble metal catalyst in the catalyst is 1% to 5%;

[0020] and / or, the catalyst includes a metal oxide catalyst, and the mass percentage content of the metal oxide catalyst in the catalyst is 10% to 60%.

[0021] In some embodiments of the present application, the mass percentage content of the catalyst in the catalytic coating is 0.1% to 100%.

[0022] In some embodiments of the present application, the morphology of the catalyst includes granular, and the particle size range is 1 nm to 2 μm.

[0023] In some embodiments of the present application, the catalytic coating further includes a binder and / or a support.

[0024] The present application also provides a cooking appliance, and the cooking appliance includes the cooking purification module as described above.

[0025] In some embodiments of the present application, the purification module is provided in the exhaust passage and / or the air circulation passage of the cooking appliance.

[0026] In some embodiments of the present application, the cooking appliance includes an air fryer.

[0027] Advantages that the present invention can achieve:

[0028] The substrate of the cooking purification module of the present application includes a conductive material and has an electrothermal effect. After being energized, the impedance of the substrate generates heat, directly heating the catalytic coating on the surface of the substrate. The catalyst in the catalytic coating also rises to its working temperature to obtain catalytic activity. The whole process has a fast heating response and high energy efficiency. The catalytic coating and the catalyst are heated more uniformly, and it is not easy to form local hot spots or cold spots, and can maintain the working temperature of the catalyst for a long time, so that the catalyst maintains catalytic activity for a long time. Under the above conditions, the cooking fume pollutants contact the active sites of the catalyst and are catalytically oxidized and degraded in an aerobic environment, thereby achieving the purpose of purifying the air. The substrate of the cooking purification module of the present application also has a through-hole structure, and the purified gas obtained after the pollutants in the cooking fume are catalytically degraded can be smoothly discharged from the cooking cavity through the above through-hole structure.

[0029] Furthermore, a catalytic coating is also provided on the inner surface of the through-hole structure of the substrate. That is, the catalyst is loaded on the inner and outer surfaces of the substrate, which can increase the contact surface between pollutant molecules such as cooking fumes and grease and the catalyst when passing through the substrate, provide more attachment sites for catalytic oxidation reactions to occur, improve the catalytic efficiency, and does not affect the electrical conductivity and heat transfer performance of the substrate, making the heat distribution on the inner and outer surfaces of the substrate uniform and further improving the catalytic effect.

[0030] In addition, the cooking purification module of the present application also has the advantages of simple structure and small volume, and can be disassembled and cleaned. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0032] Figure 1 It is a schematic structural diagram of the substrate of the cooking purification module according to the first embodiment of the present application.

[0033] Figure 2 It is a schematic structural diagram of the substrate of the cooking purification module according to the second embodiment of the present application.

[0034] Figure 3 It is a schematic structural diagram of the substrate of the cooking purification module according to the third embodiment of the present application.

[0035] Figure 4 It is a schematic structural diagram of the substrate of the cooking purification module according to the fourth embodiment of the present application.

[0036] Figure 5 It is a schematic structural diagram of the substrate of the cooking purification module according to the fifth embodiment of the present application.

[0037] Figure 6 It is a schematic structural diagram of the catalyst coating according to an embodiment of the present application.

[0038] Figure 7 It is a microscopic view of the catalyst according to an embodiment of the present application.

[0039] The realization, functional features, and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiments

[0040] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0042] In the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present application provides a cooking purification module applied to a cooking appliance. The cooking purification module includes a substrate and a catalytic coating disposed on the surface of the substrate. The substrate includes a conductive material and has a through-hole structure, and the catalytic coating includes a catalyst.

[0044] When the cooking purification module of the present application is applied to a cooking appliance, the catalyst on the catalytic coating of the cooking purification module can catalytically degrade cooking fume pollutants such as VOCs, particulate matter, and cooking fume odors generated during the cooking process.

[0045] In the cooking purification module of the present application, gas can enter the through-hole structure from one surface of the substrate and pass through the through-hole structure and exit from the other surface of the substrate.

[0046] The substrate of the cooking purification module of the present application includes a conductive material, and the conductive material has an electrothermal effect and can be used to generate heat by the electrothermal effect when energized, so that a thermal catalytic oxidation reaction occurs on the catalytic coating on the surface of the substrate. Therefore, after being energized, the impedance of the substrate generates heat, which can directly heat the catalytic coating on the surface of the substrate, and the catalyst in the catalytic coating also rises to its working temperature to obtain catalytic activity. The whole process has a fast heating response and high energy efficiency. The catalytic coating and the catalyst are heated more evenly, and it is not easy to form local hot spots or cold spots, and can be maintained within the working temperature range of the catalyst for a long time, so that the catalyst can maintain catalytic activity for a long time. Under the above conditions, the cooking fume pollutants come into contact with the active sites of the catalyst and are catalytically oxidized and degraded in an oxygen-containing environment, thereby achieving the purpose of purifying the air. The substrate of the cooking purification module of the present application has a through-hole structure, and the purified gas obtained after the pollutants in the cooking fume are catalytically degraded can be smoothly discharged from the cooking cavity through the above through-hole structure.

[0047] The present application does not limit the working voltage of the cooking purification module. In some embodiments, a direct current voltage of 50V can be applied to the cooking purification module to cause the substrate to generate heat through the electrothermal effect.

[0048] In the present application, the cooking purification module can be arranged according to the flow direction of the cooking fume exhaust gas, so that the cooking fume exhaust gas can flow onto the cooking purification module, and the pollutants therein are catalytically oxidized and degraded by the catalyst on the cooking purification module to complete the purification, and the purified gas is discharged through the through-hole structure of the substrate.

[0049] In some embodiments, the cooking purification module of the present application can be arranged in the exhaust passage and / or the air circulation passage of the cooking appliance. When the cooking fume exhaust gas generated by cooking passes through the exhaust passage and / or the air circulation passage, the pollutants therein will be intercepted by the substrate and catalytically oxidized and degraded by the catalyst on the surface of the substrate to generate carbon dioxide and water, and then discharged through the through-hole structure on the substrate, thereby achieving the purpose of catalytically oxidizing and degrading cooking fume pollutants to purify the air. It can be understood that the present application does not limit the specific position of the cooking purification module arranged in the exhaust passage and / or the air circulation passage. It can be arranged inside the exhaust passage and / or inside the air circulation passage, or at the air inlet and air outlet of the exhaust passage, and the air inlet and air outlet of the air circulation passage.

[0050] The present application does not limit the type of the conductive material. In some embodiments, the conductive material includes at least one of stainless steel, nickel-chromium alloy, PTC heating ceramics, SiC, cast iron, activated carbon, aluminum alloy, copper alloy, aluminized material, and galvanized material. The above types of conductive materials have good electrical conductivity and better electrothermal effect. After being energized, they can quickly generate heat to raise the temperature of the substrate, directly heat the catalytic coating, raise the temperature of the catalyst to the working temperature to activate the catalytic activity, and can maintain the above working temperature when energized, so that the catalyst always maintains the catalytic activity, and timely catalytically degrade the cooking fume pollutants in an aerobic environment. Moreover, the above conductive materials are easy to clean and have good durability.

[0051] The substrate of the cooking purification module of the present application includes a conductive material. It can be understood that the entire substrate is made of the conductive material, or only part of it is made of the conductive material.

[0052] For example, the entire substrate is a conductive material, and the catalytic coating is coated on the surface of the above conductive material. After the conductive material is energized, it generates heat and heats the catalyst from the inside of the catalytic coating to its working temperature.

[0053] For another example, the surface layer of the substrate is prepared with a conductive material to form a conductive layer, and then the catalytic coating is coated on the surface of the conductive layer. After the conductive layer is energized, it generates heat and heats the catalyst from the inside of the catalytic coating to its working temperature.

[0054] For another example, the interior of the substrate is made of a conductive material to obtain a conductive core. A heat-conducting layer is prepared on the surface of the conductive core, and then a catalytic coating is coated on the surface of the heat-conducting layer. The conductive core is energized to generate heat, and the heat is transferred to the catalytic coating on the surface of the substrate through the heat-conducting layer, and the catalyst is heated from the inside of the catalytic coating to its operating temperature.

[0055] In some embodiments, the substrate further includes a heat-conducting material, and the heat-conducting material includes at least one of stainless steel, nickel-chromium alloy, PTC heating ceramics, SiC, cast iron, activated carbon, aluminum alloy, copper alloy, aluminized material, and galvanized material. In this embodiment, after the conductive material in the substrate is energized to generate heat, the heat can be transferred to the thermal catalytic coating through the heat-conducting material.

[0056] The present application does not limit the specific structure of the substrate, including but not limited to two-dimensional structures and three-dimensional structures.

[0057] In some embodiments, the substrate is a two-dimensional network structure, and the two-dimensional network structure of the substrate is easy to disassemble and convenient to clean. At least one of the above two-dimensional network structure substrates is provided at the air outlet of the cooking appliance, such as in the exhaust passage and / or the air circulation passage. Thereby, pollutants in the cooking fume exhaust gas can be intercepted, catalytically oxidized and degraded to obtain purified gas, and the purified gas passes through the through-hole structure on the substrate and is discharged.

[0058] In some embodiments, the structure of the substrate is a three-dimensional structure, including at least one of a spatial network structure, a foam structure, a honeycomb structure, a reel structure, and a V-shaped grid structure.

[0059] In some embodiments, referring to Figure 1 , the structure of the substrate is a spatial network structure. The substrate with a spatial network structure is relatively light, has a large specific surface area, rich pores, and a fast heating response speed after being energized. The substrate can quickly generate heat and directly heat the catalytic coating, and the catalyst is immediately heated to its operating temperature to obtain catalytic activity. In addition, the coverage rate of the catalytic coating on the surface of the substrate with a spatial network structure is high, which is beneficial to increasing the contact area between the catalyst and the cooking fume pollutants, and promoting the rapid catalytic oxidation and degradation of the cooking fume pollutants into carbon dioxide and water.

[0060] In some embodiments, referring to Figure 2 , the structure of the substrate is a foam structure. The substrate with a foam structure is relatively light, has a large specific surface area, rich pores, and a fast heating response speed after being energized. The substrate can quickly generate heat and directly heat the catalytic coating, and the catalyst is immediately heated to its operating temperature to obtain catalytic activity. In addition, the coverage rate of the catalytic coating on the surface of the substrate with a foam structure is high, which is beneficial to increasing the contact area between the catalyst and the cooking fume pollutants, and promoting the rapid catalytic oxidation and degradation of the cooking fume pollutants into carbon dioxide and water.

[0061] In some embodiments, referring to Figure 3 , the structure of the substrate is a honeycomb structure. The substrate with a honeycomb structure is relatively light, has a large specific surface area, is rich in pores, has a fast heating response speed after being powered on, can quickly generate heat and directly heat the catalytic coating, and the catalyst is immediately heated to its operating temperature to obtain catalytic activity. In addition, the coverage rate of the catalytic coating on the surface of the honeycomb-structured substrate is high, which is beneficial to increasing the contact area between the catalyst and the cooking fume pollutants, and promoting the rapid catalytic degradation of the cooking fume pollutants into carbon dioxide and water.

[0062] In some embodiments, referring to Figure 4 , the structure of the substrate is a cylindrical structure. The substrate with a cylindrical structure is relatively light, has a large specific surface area, is rich in pores, has a fast heating response speed after being powered on, can quickly generate heat and directly heat the catalytic coating, and the catalyst is immediately heated to its operating temperature to obtain catalytic activity. In addition, the coverage rate of the catalytic coating on the surface of the cylindrical-structured substrate is high, which is beneficial to increasing the contact area between the catalyst and the cooking fume pollutants, and promoting the rapid catalytic degradation of the cooking fume pollutants into carbon dioxide and water.

[0063] In some embodiments, referring to Figure 5 , the structure of the substrate is a V-shaped grid structure. The substrate with a V-shaped grid structure is relatively light, has a large specific surface area, is rich in pores, has a fast heating response speed after being powered on, can quickly generate heat and directly heat the catalytic coating, and the catalyst is immediately heated to its operating temperature to obtain catalytic activity. In addition, the coverage rate of the catalytic coating on the surface of the substrate with a V-shaped grid structure is high, which is beneficial to increasing the contact area between the catalyst and the cooking fume pollutants, and promoting the rapid catalytic degradation of the cooking fume pollutants into carbon dioxide and water.

[0064] In some embodiments, the porosity of the substrate is 10% - 80%. For example, it can be any porosity range within the range of 10% - 80% such as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc. Under the above porosity range conditions, it is not only easy to intercept the pollutants in the cooking fume, promote the direct contact between the pollutants and the catalyst, but also can improve the coverage rate of the catalytic coating on the substrate surface to increase the contact area between the catalyst and the cooking fume pollutants, and promote the rapid catalytic degradation of the cooking fume pollutants into carbon dioxide and water.

[0065] In some embodiments, the average pore diameter of the through-hole structure of the substrate is 500 μm to 5000 μm. For example, it can be any value in the range of 500 μm to 5000 μm such as 500 μm, 800 μm, 1000 μm, 1100 μm, 1300 μm, 1500 μm, 1800 μm, 2000 μm, 2200 μm, 2500 μm, 2800 μm, 3000 μm, 3500 μm, 3800 μm, 4000 μm, 4200 μm, 4500 μm, 4550 μm, 4800 μm, 4900 μm, 4950 μm, 5000 μm, etc. Under the above average pore diameter conditions, it is not only easy to intercept the pollutants in cooking fumes, promote the direct contact between the pollutants and the catalyst on the surface of the substrate, but also can improve the coverage rate of the catalytic coating on the surface of the substrate to increase the contact area between the catalyst and the cooking fume pollutants, and promote the rapid catalytic degradation of the cooking fume pollutants into carbon dioxide and water.

[0066] In some embodiments, the inner surface of the through-hole structure of the substrate is also provided with the catalytic coating, that is, the catalyst is loaded on the inner and outer surfaces of the substrate, which can increase the contact surface between pollutant molecules such as cooking oil fumes and the catalyst when passing through the substrate, provide more attachment sites for catalytic oxidation reactions to occur, improve the catalytic efficiency, and do not affect the electrical conductivity and heat transfer performance of the substrate, making the heat distribution on the inner and outer surfaces of the substrate uniform and further improving the catalytic effect.

[0067] In some embodiments, the thickness range of the catalytic coating is 10 μm to 2 mm, and further 20 μm to 1 mm. For example, it can be any value in the range of 10 μm to 2 mm such as 10 μm, 20 μm, 50 μm, 80 μm, 100 μm, 300 μm, 500 μm, 600 μm, 800 μm, 900 μm, 1000 μm, 1300 μm, 1500 μm, 1800 μm, 1900 μm, 2000 μm, etc. Under the above thickness range conditions of the catalytic coating, it is beneficial to expose the active sites of the catalyst, increase the contact area between the active sites of the catalyst and the cooking fume pollutants, and accelerate the catalytic oxidation degradation of the cooking fume pollutants.

[0068] In some embodiments, the catalyst includes a noble metal element catalyst and / or a metal oxide catalyst, and the noble metal element catalyst and / or the metal oxide catalyst includes at least one of a noble metal element and a transition metal element. The above types of catalysts have a thermal catalytic effect and can oxidize and degrade cooking fume pollutants into carbon dioxide and water under high-temperature conditions to achieve the purpose of purifying the air.

[0069] In some embodiments, doping alkali metals and / or noble metals into the nano-lattice of the catalyst to form the above-mentioned noble metal element catalyst and / or metal oxide catalyst can further obtain a large number of oxygen vacancies, further increase the proportion of oxygen adsorbed by the catalyst, provide sufficient oxygen for the catalytic degradation of cooking fume grease, improve the efficiency of catalytic degradation, and also reduce the activation temperature of the catalyst, enabling the catalyst to catalytically degrade cooking fume grease at a relatively low temperature below 100°C.

[0070] In some embodiments, the noble metal elements include at least one of Pt, Rh, Pd, Au, and Ag. The noble metal elements of the above types can endow the catalyst with good thermal catalytic function, enabling it to oxidize and degrade cooking fume pollutants into carbon dioxide and water under high-temperature aerobic conditions, achieving the purpose of purifying the air.

[0071] In some embodiments, the transition metal elements include at least one of Ce, Cu, Co, Fe, La, Mn, and Ni. The transition metal elements of the above types can endow the catalyst with good thermal catalytic function, enabling it to oxidize and degrade cooking fume pollutants into carbon dioxide and water under high-temperature aerobic conditions, achieving the purpose of purifying the air.

[0072] In some embodiments, the catalyst includes CeO 2 , CuO, CoO, Co 3 O 4 , Fe 2 O 3 , Fe 3 O 4 , MnO 2 , Mn 2 O 3 , Mn 3 O 4 , NiO, LaMn x Co 1-x O 3 , CuFe 2 O 4 , CuMn 2 O 4 , Cu 1.5 Mn 1.5 O 4 and at least one of the following. The catalysts of the above types have good thermal catalytic effects and can oxidize and degrade cooking fume pollutants into carbon dioxide and water under high-temperature aerobic conditions, achieving the purpose of purifying the air.

[0073] In some embodiments, the catalyst includes a noble metal catalyst, and the mass percentage of the noble metal catalyst in the catalyst is 1% to 5%. For example, it can be any value in the range of 1% to 5% such as 1%, 1.5%, 2%, 3%, 3.5%, 4%, 4.5%, 5%, etc.

[0074] In some embodiments, the catalyst includes a metal oxide catalyst, and the mass percentage of the metal oxide in the catalyst is 10% to 60%. For example, it can be any value in the range of 10% to 60% such as 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

[0075] In some embodiments, the mass percentage of the catalyst in the catalytic coating is 0.1% to 100%. For example, it can be any value in the range of 0.1% to 100% such as 0.1%, 10%, 20%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 70%, 75%, 80%, 85%, 90%, 95%, 98%, 99%, 99.5%, 99.9%, etc. Energizing the substrate can comprehensively heat the catalyst, with a fast temperature rise, and can maintain a stable temperature range for a long time. Therefore, when the mass percentage of the catalyst in the catalytic coating is within the above range, it has a better oxidation and degradation effect on cooking fume pollutants.

[0076] The present application does not limit the form of the catalyst. In some embodiments, the form of the catalyst includes granular, and the particle size range is 1 nm to 2 μm. It can be any value in the range of 1 nm to 2 μm such as 1 nm, 5 nm, 10 nm, 100 nm, 500 nm, 800 nm, 1000 nm, 1200 nm, 1500 nm, 1800 nm, 1900 nm, 2000 nm, etc. The catalyst at the micro-nano scale has a large specific surface area, can expose more catalytic active sites, increase the contact area with cooking fume pollutants, and achieve the effect of rapid oxidation and degradation of cooking fume pollutants.

[0077] In some embodiments, the catalytic coating further includes a binder and / or a carrier. Refer to Figure 6 , Figure 6 , the catalytic coating of 2 O 3 includes a substrate 3, a binder, and a thermal catalyst 1. The binder can strengthen the adhesion between the catalyst and the substrate, and reduce the risk that the catalyst powder falls off during long-term use, resulting in a poor catalytic degradation effect or even failure. The present application does not limit the type of the binder, including organic binders and / or inorganic binders. In some embodiments, the binder includes γ-Al 2 , SiO 2 , TiO 2, at least one of molecular sieve, polyethersulfone and polyamideimide. A small amount of the above types of binders can exhibit good viscosity, which can not only enhance the adhesion between the catalyst and the substrate, firmly fix the catalyst on the surface of the substrate, but also increase the proportion of the catalyst in the catalytic coating, thereby enhancing the catalytic oxidation and degradation effect on cooking fume pollutants.

[0078] The carrier can carry the catalyst, which is beneficial to expose a large number of catalytic active sites on the catalyst to the air, increase the contact area with cooking fume pollutants, and achieve the effect of rapid catalytic oxidation and degradation of cooking fume pollutants. The present application also does not limit the type of the carrier. In some embodiments, the carrier includes molecular sieve, and the molecular sieve includes at least one of BETA5 molecular sieve, USY5 molecular sieve, and ZSM-5 molecular sieve. With the help of the above types of carriers, the catalyst can expose a large number of catalytic active sites to the air, increase the contact area with cooking fume pollutants, and achieve the purpose of rapid catalytic oxidation and degradation of cooking fume pollutants.

[0079] The present application also provides a cooking appliance, which includes the cooking purification module as described above in the present application.

[0080] In the present application, the cooking purification module can be provided according to the flow direction of cooking fume pollutants, so that the cooking fume pollutants can flow onto the cooking purification module and be discharged through the through holes of the substrate.

[0081] Existing cooking appliances usually have an exhaust passage and / or an air circulation passage for discharging gases or achieving air circulation. In some embodiments, the cooking purification module is provided in the exhaust passage and / or the air circulation passage of the cooking appliance, and the discharge system of the cooking appliance is utilized, whereby the cooking fume pollutants can be intercepted. It can be understood that the present application does not limit the specific position where the cooking purification module is provided in the exhaust passage and / or the air circulation passage. It can be provided inside the exhaust passage and / or inside the air circulation passage, or at the air inlet and air outlet of the exhaust passage, and the air inlet and air outlet of the air circulation passage.

[0082] Air fryers are prone to generate a large amount of oil fume waste gas during the cooking process, which contains air pollutants such as VOCs, particulate matter, and odors. These oil fume waste gases are directly discharged into the kitchen environment, polluting the indoor air. Long-term exposure to the oil fume waste gas environment threatens people's physical health. To solve the above problems, technicians use thermal catalytic reactions to degrade the pollutants in the oil fume waste gas. However, in traditional endothermic gas-solid multiphase catalytic reactions, heat is usually supplied to the reactor by an external electric heater to ensure that the catalyst undergoes catalytic reactions at an appropriate temperature. In this way, the heat required for the catalytic reaction in the reactor comes entirely from outside the catalyst, that is, the external electric heater. Therefore, the temperature of the catalytic reaction is limited by the heat conduction process, which easily leads to a longer start-up time of the catalytic reactor and uneven heating of the catalytic coating, forming local hot spots or cold spots, ultimately resulting in a decrease in the catalytic activity of the catalyst or even failing to meet the catalytic requirements.

[0083] In some embodiments, the cooking appliance is an air fryer, and the cooking and purification device of the present application is installed on the air fryer. The air fryer applying the cooking and purification module of the present application uses the heat generated by the cooking itself and the heat generated by the energization of the cooking and purification module as the catalytic heat source. The oxygen vacancies of the catalyst adsorb oxygen in the air to continuously provide an oxygen source, prompting the oxidation and degradation of the oil fume and grease molecules generated by cooking, and ultimately being degraded into carbon dioxide and water, achieving the purpose of timely degrading the oil fume and grease during the cooking process, ensuring the purification of the oil fume and odor gases generated in the cooking cavity when they are discharged outward, and without additional energy consumption. It can not only reduce environmental pollution, reduce the damage to people's health, but also reduce the accumulation of oil stains in the cavity, making the cooking appliance easy to clean.

[0084] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and are not used to limit the present invention.

[0085] Example 1

[0086] The cooking and purification module of Example 1 is in the shape of a three-dimensional honeycomb, prepared from stainless steel material, and its surface is coated with a catalytic coating. The performance of the catalytic coating is shown in Table 1.

[0087] The cooking and purification module of this embodiment is arranged at the air outlet of the air fryer to obtain an air fryer with a cooking and purification module.

[0088] Examples 2 to 10

[0089] The cooking and purification modules of Examples 2 to 10 refer to Example 1, and the differences are shown in Table 1.

[0090] The cooking and purification modules of Examples 2 to 10 were respectively installed at the air outlet of the air fryer of the same model as that of the example to obtain an air fryer with a cooking and purification module.

[0091] Comparative Example 1

[0092] For Comparative Example 1, an air fryer of the same model as that of the example was selected, but no cooking and purification module was installed at the air outlet of the air fryer.

[0093] Comparative Example 2

[0094] The cooking and purification module of Comparative Example 2 referred to the example. However, the difference was that no catalytic coating was prepared on the substrate of the cooking and purification module, and then this cooking and purification module was installed at the air outlet of the air fryer of the same model as that of Example 1.

[0095] Comparative Examples 3 to 5

[0096] The cooking and purification modules of Comparative Examples 3 to 5 referred to the example. However, the difference was that no catalytic coating was prepared on the substrate of the cooking and purification module, and then this cooking and purification module was installed at the air outlet of the air fryer of the same model as that of Example 1.

[0097] Comparative Examples 6 to 8

[0098] The cooking and purification modules of Comparative Examples 6 to 8 referred to Example 1. However, the difference was that the material for preparing the substrate of the cooking and purification module was cordierite, and then this cooking and purification module was installed at the air outlet of the air fryer of the same model as that of Example 1.

[0099] Table 1 Comparison of characteristics of air fryers in examples and comparative examples

[0100]

[0101] Performance test

[0102] 1. The catalytic coating of Example 1 was characterized by a scanning electron microscope to obtain the characterization diagram as Figure 7 shown.

[0103] 2. The product modules in the examples and comparative examples were installed at the air outlet of the air fryer, and electrode plates were installed on both sides of them, and 50V direct current was applied; 100g of edible peanut oil was added to the cooking cavity of the air fryer, and it was set to work normally in the grilling mode; a gas sampling probe was set at the air outlet of the air fryer, and a VOC detector was used to continuously detect the VOC concentration at the air outlet.

[0104] Table 2 Performance comparison of air fryers in examples and comparative examples

[0105] Experimental group Average VOC concentration (ppm) Purification rate (%) Example 1 30 98.50％ Example 2 25 98.75％ Example 3 20 99.00％ Example 4 35 98.25％ Example 5 150 92.50％ Example 6 200 90.00％ Example 7 100 95.00％ Example 8 80 96.00％ Example 9 120 94.00％ Example 10 100 95.00％ Comparative example 1 2000 0 Comparative example 2 2000 0 Comparative example 3 2000 0 Comparative example 4 2000 0 Comparative example 5 2000 0 Comparative example 6 1000 50％ Comparative example 7 700 65％ Comparative example 8 500 75％

[0106] As can be seen from Table 1 to Table 2, the air fryers of Examples 1 to 10 are installed with different types of cooking purification modules. The average concentration of VOC at the air outlet of the air fryer is measured to be between 20 and 200 ppm, indicating that the integrated self-heating catalytic purification module has played a purification role, and the purification rate has reached 90% to 99%.

[0107] The heating air fryer of Comparative Example 1 is not installed with a cooking purification module, which is equivalent to a blank control. The average concentration of VOC at the air outlet is measured to be 2000 ppm, and the purification rate is 0%.

[0108] Although the air fryer of Comparative Example 2 is applied with a cooking purification module, its substrate surface does not have a catalytic coating. The average concentration of VOC at the air outlet is measured to be 2000 ppm, and it has no purification function at all.

[0109] Although the substrates of the cooking purification modules of Comparative Examples 3 to 5 are coated with a coating, but no catalyst is used. The average concentration of VOC at the air outlet is measured to be 2000 ppm, and it has no purification function at all.

[0110] Although the substrate surfaces of the cooking purification modules of Comparative Examples 6 to 8 are coated with a catalytic coating, the substrates are made of cordierite without electrical conductivity and do not generate electrothermal effects. The average concentration of VOC at the air outlet is measured to be between 500 ppm and 1000 ppm, and the purification function is limited, and the purification rate is only 50% to 75%. The reason why the cooking purification modules of Comparative Examples 6 to 8 have a catalytic function is that the waste gas of the air fryer itself has a certain temperature, which can activate part of the catalyst, causing a certain degree of catalytic oxidation and degradation reaction of the pollutants in the cooking fume waste gas. However, because the substrate material has no electrical conductivity, it cannot generate an electrothermal effect to directly heat the catalytic coating, making it difficult to reach the working temperature required by the catalyst, and it is also difficult to maintain the working temperature required by the catalyst all the time, resulting in limited catalytic purification function and low purification rate.

[0111] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A cooking purification module is applied to a cooking appliance. It is characterized in that the cooking purification module includes a substrate and a catalytic coating disposed on the surface of the substrate. The substrate includes a conductive material and has a through-hole structure, and the catalytic coating includes a thermal catalyst.

2. The cooking purification module according to claim 1, It is characterized in that gas can enter the through-hole structure from one surface of the substrate and pass through the through-hole structure and come out from the other surface of the substrate.

3. The cooking purification module according to claim 1, It is characterized in that the conductive material is used to generate heat through electrothermal effect when electrified, so that a thermal catalytic oxidation reaction occurs on the catalytic coating on the surface of the substrate.

4. The cooking purification module according to claim 1, It is characterized in that the conductive material includes at least one of stainless steel, nickel-chromium alloy, PTC heating ceramics, SiC, cast iron, activated carbon, aluminum alloy, copper alloy, aluminized material, and galvanized material.

5. The cooking purification module according to claim 1, It is characterized in that the substrate further includes a heat-conducting material, and the heat-conducting material includes at least one of stainless steel, nickel-chromium alloy, PTC heating ceramics, SiC, cast iron, activated carbon, aluminum alloy, copper alloy, aluminized material, and galvanized material.

6. The cooking purification module according to claim 1, It is characterized in that the structure of the substrate includes at least one of a space network structure, a foam structure, a honeycomb structure, a reel structure, and a V-shaped grid structure.

7. The cooking purification module according to claim 1, It is characterized in that the porosity of the substrate is 10% - 80%; and / or, the average pore diameter of the through-hole structure is 500μm - 5000μm.

8. The cooking purification module according to claim 1, It is characterized in that the inner surface of the through-hole structure of the substrate is also provided with the catalytic coating.

9. The cooking purification module according to claim 1, It is characterized in that the thickness range of the catalytic coating is 10μm - 2mm.

10. The cooking purification module according to claim 9, It is characterized in that the thickness range of the catalytic coating is 20μm - 1mm.

11. The cooking purification module according to claim 1, It is characterized in that the catalyst includes a noble metal element catalyst and / or a metal oxide catalyst, and the noble metal element catalyst and / or the metal oxide catalyst includes at least one of a noble metal element and a transition metal element.

12. The cooking purification module according to claim 11, It is characterized in that the noble metal element includes at least one of Pt, Rh, Pd, Au, and Ag; and / or, the transition metal element includes at least one of Ce, Cu, Co, Fe, La, Mn, and Ni.

13. The cooking purification module according to claim 12, It is characterized in that The catalyst includes CeO 2 , CuO, CoO, Co 3 O 4 , Fe 2 O 3 , Fe 3 O 4 , MnO 2 , Mn 2 O 3 , Mn 3 O 4 , NiO, LaMn x Co 1-x O 3 , CuFe 2 O 4 , CuMn 2 O 4 , Cu 1.5 Mn 1.5 O 4 or at least one of them.

14. The cooking purification module according to claim 1, It is characterized in that the catalyst includes a noble metal catalyst, and the mass percentage content of the noble metal catalyst in the catalyst is 1% - 5%; And / or, the catalyst includes a metal oxide catalyst, and the mass percentage of the metal oxide in the catalyst is 10% to 60%.

15. The cooking purification module according to claim 1, wherein, the mass percentage of the catalyst in the catalytic coating is 0.1% to 100%.

16. The cooking purification module according to claim 1, wherein, the form of the catalyst includes granular, and the particle size range is 1 nm to 2 μm.

17. The cooking purification module according to claim 1, wherein, the catalytic coating further includes a binder and / or a carrier.

18. A cooking appliance, wherein, the cooking appliance includes the cooking purification module according to any one of claims 1 to 17.

19. The cooking appliance according to claim 18, wherein, the purification module is provided in the exhaust passage and / or the air circulation passage of the cooking appliance.

20. The cooking appliance according to claim 19, wherein, the cooking appliance includes an air fryer.

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