Heating element, heating assembly, and microwave cooking appliance

Abstract

Disclosed in the present application are a heating element, a heating assembly, and a microwave cooking appliance. The heating element comprises a heating tube and a microwave shielding cover, wherein the heating tube comprises a heating body, and the heating body is a carbon fiber heating body or a graphite heating body; the microwave shielding cover covers the outer side of the heating tube; the microwave shielding cover comprises a transmission area, and the transmission area is arranged opposite the heating body; in the lengthwise direction or the circumferential direction of the heating tube, the transmission area covers at least part of the heating body; and the transmission area comprises at least one through hole, and the maximum opening size of any through hole is less than a quarter of the wavelength of microwaves emitted by a microwave cooking appliance. When the heating element is used in a microwave cooking appliance, during the process of both microwaves and the heating tube heating food, heat from the heating tube is radiated into a cooking cavity through the through hole of the transmission area, and under the shielding of the microwave shielding cover, the microwaves in the cooking cavity are unable to pass through the microwave shielding cover and reach the position of the heating tube, thereby reducing the problem of sparking occurring when the heating tube is used in a microwave environment.

Description

Heating element, heating component and microwave cooking appliance

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of the following patent applications, the entire contents of which are incorporated herein by reference:

[0003] A Chinese patent application entitled “Heating element, heating component and microwave cooking appliance”, application number 202311788614.6, submitted to the State Intellectual Property Office of China on December 22, 2023. Technical Field

[0004] The present application belongs to the technical field of household appliances, and in particular relates to a heating element, a heating assembly and a microwave cooking appliance. Background Art

[0005] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0006] Cooking appliances with microwave cooking functions usually also include a heating tube, which is used to heat food together with microwaves to improve the cooking effect of the food.

[0007] In existing heating tubes, the heating element usually includes carbon fiber or graphite. When the heating element is used in a microwave environment, the carbon fiber or graphite is prone to ignition, thereby reducing safety during use.

[0008] Summary of the Invention

[0009] The purpose of this application is to at least solve the problem of sparking that occurs when existing heating tubes are used in a microwave environment. This purpose is achieved through the following technical solutions:

[0010] A first aspect of the present application provides a heating element for a microwave cooking appliance, the heating element comprising:

[0011] A heating pipe, wherein the heating pipe comprises a heating element, and the heating element is a carbon fiber heating element or a graphite heating element;

[0012] A microwave shielding cover is arranged on the outside of the heating tube, the microwave shielding cover includes a transmission area, the transmission area is arranged opposite to the heating element, and along the length direction or circumferential direction of the heating tube, the transmission area at least partially covers the heating element, the transmission area includes at least one through hole, and the maximum opening size of any through hole is less than one-quarter wavelength of the microwave emitted by the microwave cooking device.

[0013] When the heating element in the present application is used in a microwave cooking appliance, in the process of using microwaves and the heating tube to heat the food in the cooking cavity at the same time, the heat of the heating tube is radiated into the cooking cavity through the through holes in the projection area to heat the food in the cooking cavity. The microwaves in the cooking cavity cannot pass through the microwave shielding cover and reach the position of the heating tube under the shielding of the microwave shielding cover, thereby reducing the problem of ignition of the heating tube when used in a microwave environment, thereby improving safety during use.

[0014] In addition, the heating element according to the present application may also have the following additional technical features:

[0015] In some embodiments of the present application, the number of the through holes is at least two, all of the through holes are dispersedly arranged in the transmission area, and the interval distance between any two adjacent through holes is greater than 0.5 mm.

[0016] In some embodiments of the present application, the porosity of the transmission area is in the range of 0.5 to 0.8.

[0017] In some embodiments of the present application, all of the through holes constitute a multi-row hole group;

[0018] Wherein, along the circumferential direction of the heating tube, at least two adjacent through holes among all the through holes are staggered.

[0019] In some embodiments of the present application, the microwave shielding cover also includes a reflective area, which is arranged opposite to the transmissive area. Along the circumferential direction of the heating tube, one side of the reflective area is connected to one side of the transmissive area, and the other side of the reflective area is connected to the other side of the transmissive area.

[0020] In some embodiments of the present application, along the circumferential direction of the heating tube, the central angle formed by the transmission area is within a range of 100° to 300°.

[0021] In some embodiments of the present application, the through hole is in a shape of a circle, an ellipse, a triangle, a quadrilateral or a pentagon.

[0022] In some embodiments of the present application, the through hole is circular in shape, and the diameter of the through hole is d, wherein 3 mm ≤ d ≤ 8 mm.

[0023] In some embodiments of the present application, along an axial direction perpendicular to the heating tube, the cross-section of the microwave shielding cover is an annular structure, and the annular structure is circular, elliptical, triangular, quadrilateral or pentagonal.

[0024] In some embodiments of the present application, the microwave shielding cover is coaxially arranged with the heating tube;

[0025] And / or the wall thickness of the microwave shielding cover is greater than or equal to 1 mm.

[0026] A second aspect of the present application provides a heating assembly, which includes the heating element as described above.

[0027] When the heating assembly in the present application is used in a microwave cooking appliance, in the process of using microwaves and the heating tube of the heating element to heat the food in the cooking cavity at the same time, the heat of the heating tube is radiated into the cooking cavity through the through holes in the projection area to heat the food in the cooking cavity. The microwaves in the cooking cavity cannot pass through the microwave shielding cover and reach the position of the heating tube under the shielding of the microwave shielding cover, thereby reducing the problem of ignition of the heating tube when used in a microwave environment, thereby improving safety during use.

[0028] A third aspect of the present application provides a microwave cooking appliance, comprising the heating assembly as described above.

[0029] According to the microwave cooking appliance of the present application, in the process of simultaneously heating the food in the cooking cavity by using microwaves and the heating tube in the heating assembly, the heat of the heating tube is radiated into the cooking cavity through the through holes in the projection area to heat the food in the cooking cavity. The microwaves in the cooking cavity cannot pass through the microwave shielding cover and reach the position of the heating tube under the shielding of the microwave shielding cover, thereby reducing the problem of ignition of the heating tube when used in a microwave environment, thereby improving safety during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0031] FIG1 schematically shows a schematic structural diagram of a microwave cooking appliance according to an embodiment of the present application;

[0032] FIG2 schematically shows a schematic structural diagram of a heating element according to an embodiment of the present application;

[0033] FIG3 is a schematic diagram of the exploded structure of the heating element shown in FIG2 ;

[0034] FIG4 is a schematic structural diagram of the microwave shield shown in FIG3 ;

[0035] FIG5 is a schematic structural diagram of the microwave shield shown in FIG4 from another perspective;

[0036] FIG6 is a schematic diagram of the cross-sectional structure of the microwave shield shown in FIG4 ;

[0037] FIG7 is a schematic structural diagram of the mounting base shown in FIG3 ;

[0038] FIG8 is a schematic structural diagram of the mounting base shown in FIG7 from another perspective;

[0039] FIG9 is a schematic structural diagram of the heating tube shown in FIG3 ;

[0040] FIG. 10 is a graph showing the core temperature and heating time of microwave cooking appliances at different porosities.

[0041] The accompanying drawings are marked as follows: 100, microwave cooking appliance; 10, cabinet; 20, door; 30, heating assembly; 31, heat insulation cover; 32, heating element; 321, heating tube; 3211, heating part; 3212, connecting part; 32121, first limiting part; 3213, wiring part; 322, mounting seat; 3221, receiving groove; 3222, opening; 3223, first abutting surface; 3224, second abutting surface; 3225, second limiting part; 3226, first limiting structure; 3227, through hole; 3228, connecting hole; 323, microwave shielding cover; 3231, transmission area; 32311, through hole; 3232, reflection area; 3233, second limiting structure; 3234, mounting part x, length direction of the heating tube. DETAILED DESCRIPTION

[0042] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0044] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0045] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0046] As shown in FIG. 1 to FIG. 10 , according to an embodiment of the present application, a heating element 32 is proposed. The heating element 32 includes a mounting base 322 , a microwave shielding cover 323 and a heating tube 321 .

[0047] The heating tube 321 includes a heating element, which is a graphite heating element or a carbon fiber heating element. The heating tube 321 is connected to the mounting seat 322 . The microwave shielding cover 323 cooperates with the mounting seat 322 and covers the outside of the heating tube 321 .

[0048] It should be understood that the heating element in the heating tube 321 is configured as a graphite heating element or a carbon fiber heating element, which provides the heating tube 321 with advantages such as rapid heating speed, high light intensity, good display effect, and strong thermal stability. However, when the heating tube 321 is exposed to microwaves emitted by a microwave cooking appliance (the frequency of microwaves emitted by microwave cooking appliances is generally between 2000 MHz and 300 MHz), since the graphite heating element or the carbon fiber heating element contains carbon, the heating tube 321 may spark during operation.

[0049] In the present application, the microwave shielding cover 323 refers to a component that has a shielding effect on microwaves, that is, when microwaves reach the microwave shielding cover 323, the microwave shielding cover 323 can reflect the microwaves to prevent the microwaves from passing through the microwave shielding cover 323 and propagating.

[0050] When the heating tube 321 is covered by the microwave shielding cover 323 , the heating tube 321 is inside the microwave shielding cover 323 . When the heating element 32 is in a microwave environment, the microwave shielding cover 323 separates the heating tube 321 from the microwave, so that the microwave cannot reach the heating tube 321 .

[0051] When the heating element 32 in the present application is used in the microwave cooking appliance 100, in the process of using microwaves and the heating tube 321 to heat the food in the cooking cavity at the same time, the heat of the heating tube 321 is radiated into the cooking cavity through the microwave shielding cover 323 to heat the food in the cooking cavity. The microwaves in the cooking cavity cannot reach the position of the heating tube 321 under the shielding of the microwave shielding cover 323, thereby reducing the problem of ignition of the heating tube 321 when used in a microwave environment, thereby improving safety during use.

[0052] It should be pointed out that in the present application, the microwave shielding cover 323 can be a metal part or a non-metal part. When the microwave shielding cover 323 is a metal part, the metal part can be a stainless steel part, etc. When the microwave shielding cover 323 is a non-metal part, the non-metal part can be ceramic, etc.

[0053] In addition, the shape of the microwave shielding cover 323 can be consistent with the shape of the heating tube 321, or it can be inconsistent with the shape of the heating tube 321. In the present application, the shape of the microwave shielding cover 323 is approximately consistent with the shape of the heating tube 321, so that on the basis of using the microwave shielding cover 323 to cover the heating tube 321, the overall volume of the heating element 32 can be effectively reduced, which facilitates the layout and installation of the heating element 32 during use.

[0054] In addition, in the present application, the heating tube 321 is a columnar structure, and the extension direction of the columnar structure is the length direction x of the heating tube 321. At the same time, the heating tube 321 has a central axis, which is set along the length direction x of the heating tube 321, and the direction around the central axis is the circumferential direction of the heating tube 321.

[0055] In some embodiments of the present application, as shown in Figures 2 and 3, two mounting seats 322 are provided on the heating tube 321, wherein the two mounting seats 322 are spaced apart in the length direction x of the heating tube 321, and the two mounting seats 322 are respectively matched with the microwave shielding cover 323.

[0056] In the present application, the heating tube 321 and the mounting base 322 are connected to each other. When the heating element 32 is used in the microwave cooking appliance 100, the mounting base 322 is connected and fixed to the structural components of the microwave cooking appliance 100 to achieve the installation and fixation of the heating element 32.

[0057] Specifically, two mounting seats 322 are respectively installed on the heating tube 321 and respectively cooperate with the microwave shielding cover 323. Two mounting seats 322 are set. On the one hand, when the heating element 32 is used on the microwave cooking appliance 100, the connection position between the heating element 32 and the structural parts of the microwave cooking appliance 100 can be increased, so that the connection strength and stability of the heating element 32 can be improved. On the other hand, the cooperation position of the microwave shielding cover 323 can be increased, thereby improving the strength and stability of the microwave shielding cover 323.

[0058] It should be noted that the two mounting seats 322 are spaced apart in the length direction x of the heating tube 321 , wherein the connection position of the mounting seats 322 on the heating tube 321 can be the end of the heating tube 321 or on the body between the two ends.

[0059] In some embodiments of the present application, as shown in Figures 2, 3 and 9, the heating tube 321 includes a connecting portion 3212 and a heating portion 3211, wherein the heating element is arranged inside the heating portion 3211, and there are two connecting portions 3212. Along the length direction x of the heating tube 321, a connecting portion 3212 is respectively installed on the two opposite ends of the heating tube 321, and a mounting base 322 is respectively connected to each connecting portion 3212.

[0060] Specifically, the two connecting parts 3212 are respectively connected to the opposite ends of the heating part 3211 along the length direction x of the heating tube 321, and a mounting seat 322 is fixedly installed on each connecting part 3212. The microwave shielding cover 323 is arranged on the outside of the heating tube 321 and cooperates with the two mounting seats 322 respectively. At this time, the microwave shielding cover 323 can effectively cover the heating part 3211 with the heating element, which can further reduce the situation where microwaves are transmitted to the position of the heating element, thereby further reducing the ignition problem of the heating element 32 in the microwave environment.

[0061] It should be understood that when the heating element 32 is heating, the heating element located inside the heating portion 3211 is energized. The heating element is a graphite heating element or a carbon fiber heating element with a high electrical resistance. When energized, the heating element emits light and heat. The heat generated by the heating element can be radiated through the microwave shielding cover 323 to achieve heating and cooking of food. Along the length direction x of the heating tube 321, the two connecting portions 3212 are connected to the two opposite ends of the heating portion 3211 and are connected to the microwave shielding cover 323 via the mounting base 322. This can reduce obstructions between the heating portion 3211 and the microwave shielding cover 323, thereby improving the thermal efficiency of the heating element 32.

[0062] In the present application, the heating part 3211 includes a glass tube, the heating element is arranged inside the glass tube, and the two ends of the glass tube are respectively connected and fixed with a connecting part 3212, wherein the glass tube needs to be evacuated so that the heating element can be in an environment close to a vacuum or filled with inert gas in the vacuum tube, thereby reducing oxidation and other reactions that occur in the heating element during the heating process.

[0063] In addition, the connecting portion 3212 can be a metal part (such as a stainless steel part, etc.) or a non-metal part (such as a ceramic part, etc.), and the connection method between the connecting portion 3212 and the glass tube is bonding or clamping.

[0064] It should be pointed out that, in the present application, the matching modes between the microwave shielding cover 323 and the mounting seat 322 include plug-in matching, snap-on matching, welding matching, fastener connection matching or adhesive matching, etc.

[0065] In some embodiments of the present application, as shown in FIG2 , the cooperation between the microwave shielding cover 323 and the mounting seat 322 includes plug-in cooperation.

[0066] Specifically, the heating tube 321 includes a connecting portion 3212 and a heating portion 3211, wherein the heating element is arranged inside the heating portion 3211, and there are two connecting portions 3212. Along the length direction x of the heating tube 321, a connecting portion 3212 is respectively installed on the two opposite ends of the heating tube 321, and a mounting seat 322 is respectively connected to each connecting portion 3212.

[0067] The microwave shielding cover 323 includes two mounting portions 3234, which are respectively arranged at opposite ends of the microwave shielding cover 323 along the length direction x of the heating tube 321. When the microwave shielding cover 323 is mated with the mounting base 322, the mounting base 322 and the mounting portions 3234 of the microwave shielding cover 323 are mated in a plug-in manner.

[0068] The plug-in fit between the microwave shielding cover 323 and the mounting base 322 is simple in structure and easy to assemble. In addition, the plug-in fit structure can achieve structural superposition at the plug-in position, thereby increasing the structural strength of the connection position and improving the overall structural stability of the heating element 32.

[0069] It should be pointed out that the microwave shielding cover 323 and the mounting base 322 are plugged together. During implementation, the mounting portion 3234 of the microwave shielding cover 323 can be plugged into the inside of the mounting base 322, or part of the structure of the mounting base 322 can be plugged into the inside of the mounting portion 3234.

[0070] In some embodiments of the present application, as shown in FIG7 , a receiving groove 3221 is provided on the mounting portion 3234, and the receiving groove 3221 has an opening 3222. When the heating element 32 is assembled, the connecting portion 3212 of the heating tube 321 is inserted into the interior of the receiving groove 3221 through the opening 3222 of the receiving groove 3221, the microwave shielding cover 323 is disposed on the outside of the heating tube 321, and the mounting portion 3234 of the microwave shielding cover 323 is also inserted into the interior of the receiving groove 3221 through the opening 3222 of the receiving groove 3221. In this case, the mounting portion 3234 is disposed between the inner sidewall of the receiving groove 3221 and the connecting portion 3212.

[0071] The connecting portion 3212 of the heating tube 321 and the mounting portion 3234 of the microwave shielding cover 323 are respectively inserted into the receiving groove 3221 of the mounting base 322. The mounting base 322 can be used to protect the end of the heating tube 321 and the end of the microwave shielding cover 323, thereby reducing damage to the heating tube 321 and the microwave shielding cover 323 caused by external impact.

[0072] In addition, the heating tube 321 is completely wrapped by the mounting base 322 and the microwave shielding cover 323 , thereby effectively protecting the heating tube 321 and reducing the impact of external factors on the heating tube 321 , thereby reducing the possibility of damage to the heating tube 321 .

[0073] Furthermore, in the present application, the mounting base 322 is made of a thermally insulating material, which is a poor conductor of heat, such as ceramic. This configuration of the mounting base 322 reduces the amount of heat transferred from the heating element 32 through the mounting base 322 during use. This reduces the likelihood of heat from the heating element 32 transferring to other components when used in the microwave cooking device 100, thereby reducing the risk of damage to other components of the microwave cooking device 100 caused by the heating element 32.

[0074] It should be understood that there are two mounting seats 322, and along the length direction x of the heating tube 321, there are two connecting portions 3212 of the heating tube 321, and two mounting portions 3234 of the microwave shielding cover 323. When assembling the heating element 32, first, one connecting portion 3212 of the heating tube 321 is inserted into the receiving groove 3221 of one mounting seat 322. Then, the cylindrical microwave shielding cover 323 is placed on the outside of the heating tube 321 (with the inner side wall of the microwave shielding cover 323 spaced apart from the outer surface of the heating tube 321). The mounting portion 3234 of the microwave shielding cover 323 is inserted into the receiving groove 3221 of one mounting seat 322. Then, the other mounting seat 322 is placed over the other mounting portion 3234 of the heating tube 321 and the other mounting portion 3234 of the microwave shielding cover 323. Among them, the connecting part 3212 is connected and fixed to the mounting seat 322, and the connection and fixing methods include but are not limited to snapping or bonding. The microwave shielding cover 323 is clamped between the two mounting seats 322. The microwave shielding cover 323 and the two mounting seats 322 can be connected (high-temperature glue is added between the two) or not connected.

[0075] In some embodiments of the present application, as shown in Figures 2, 3, 5 and 7, there are two mounting seats 322, each mounting seat 322 is provided with a receiving groove 3221 with an opening 3222, and a first limiting structure 3226 is provided on the inner side wall of the receiving groove 3221. Along the length direction x of the heating tube 321, there are two connecting parts 3212 of the heating tube 321, and there are two mounting parts 3234 of the microwave shielding cover 323, and each mounting part 3234 is provided with a second limiting structure 3233.

[0076] When assembling the heating element 32, one connecting portion 3212 of the heating pipe 321 is inserted into the receiving groove 3221 of a mounting seat 322, and then the microwave shielding cover 323 with a cylindrical structure is sleeved on the outside of the heating pipe 321, so that the mounting portion 3234 of the microwave shielding cover 323 is inserted into the receiving groove 3221 of one mounting seat 322, and the second limiting structure 3233 cooperates with the first limiting structure 3226. Then, the other mounting seat 322 is sleeved on the other mounting portion 3234 of the heating pipe 321 and the other mounting portion 3234 of the microwave shielding cover 323 (the second limiting structure 3233 of the mounting portion 3234 of the microwave shielding cover 323 cooperates with the first limiting structure 3226 of the receiving groove 3221 of the mounting seat 322). Finally, the connecting portion 3212 and the mounting seat 322 are connected and fixed, and the microwave shielding cover 323 is clamped between the two mounting seats 322.

[0077] Among them, along the circumferential direction of the heating tube 321, the first limiting structure 3226 and the second limiting structure 3233 in a mating state can limit the displacement of the microwave shielding cover 323, that is, they can limit the rotation of the microwave shielding cover 323 relative to the heating tube 321, thereby effectively maintaining the installation position of the microwave shielding cover 323, and reducing the occurrence of the heating efficiency of the heating element 32 being affected by the rotation of the microwave shielding cover 323 relative to the heating tube 321.

[0078] It should be pointed out that in the present application, the first limiting structure 3226 and the second limiting structure 3233 are concave-convex matching structures, that is, the two are embedded in each other, and the limiting function is achieved by means of the embedded setting. The embedded setting structure is simple, easy to process and manufacture, and can effectively reduce the manufacturing cost of the heating element 32.

[0079] In some embodiments of the present application, as shown in FIG2 , the microwave shielding cover 323 and the mounting base 322 are plugged into and mated with each other, wherein the mounting portion 3234 of the microwave shielding cover 323 is plugged into the receiving groove 3221 of the mounting base 322, and a first limiting structure 3226 located on the inner sidewall of the receiving groove 3221 cooperates with a second limiting structure 3233 located on the mounting portion 3234 to limit the rotation of the microwave shielding cover 323 relative to the heating tube 321. One of the first limiting structure 3226 and the second limiting structure 3233 is a protruding structure, and the other is a groove structure or a notch structure.

[0080] Specifically, when the groove structure or notch structure is formed on the inner sidewall of the mounting groove, the groove structure or notch structure is interlinked with the opening 3222 of the receiving groove 3221. When the groove structure or notch structure is formed on the mounting portion 3234 of the microwave shielding cover 323, the groove structure or notch structure is interlinked with the end of the mounting portion 3234. When the protrusion structure is formed on the inner sidewall of the receiving groove 3221, the protrusion structure is protruded relative to the inner sidewall of the receiving groove 3221. When the protrusion structure is formed on the mounting portion 3234, the protrusion structure is protruded from the outer circumference of the protrusion structure.

[0081] Taking the example of a first limiting structure 3226 being a protruding structure and a second limiting structure 3233 being a notch structure, the notch structure is formed on the outer peripheral surface of the mounting portion 3234 of the microwave shielding cover 323 and is arranged to penetrate the end of the mounting portion 3234. The notch structure extends along the length direction x of the heating tube 321, and the protruding structure is formed on the inner side wall of the receiving groove 3221 of the mounting seat 322. During assembly, the notch structure and the protruding structure are aligned, and the mounting portion 3234 is inserted into the receiving groove 3221 through the opening 3222 of the receiving groove 3221. During the insertion process, the protruding structure slides into the notch structure of the mounting portion 3234 to achieve a chimeric installation between the two. When the protruding structure abuts against the closed end of the notch structure (the end away from the through end of the notch structure), the microwave shielding cover 323 is installed in place.

[0082] In some embodiments of the present application, as shown in Figures 7 and 9, a receiving groove 3221 is defined on the mounting base 322. The receiving groove 3221 has an opening 3222, and the mounting portion 3234 of the microwave shielding cover 323 is inserted into the receiving groove 3221 through the opening 3222. A first abutment surface 3223 is provided within the receiving groove 3221, intersecting the longitudinal direction x of the heating tube 321. After the mounting portion 3234 of the microwave shielding cover 323 is properly installed within the receiving groove 3221, the mounting portion 3234 abuts against the first abutment surface 3223, thereby limiting the mounting portion 3234. This reduces displacement of the microwave shielding cover 323 in the longitudinal direction x of the heating tube 321, thereby reducing the impact on the heating efficiency of the heating element 32 caused by the movement of the microwave shielding cover 323 relative to the heating tube 321.

[0083] It should be noted that a first protrusion is provided within the receiving groove 3221, and a first abutting surface 3223 is formed on the first protrusion. The first abutting surface 3223 can be parallel to or angled with the plane of the opening 3222 of the receiving groove 3221. The side surface of the mounting portion 3234 that abuts the first abutting surface 3223 is adapted to the first abutting surface 3223.

[0084] In some embodiments of the present application, as shown in Figures 7 and 9, a receiving groove 3221 is formed on the mounting base 322. The receiving groove 3221 has an opening 3222. The mounting portion 3234 of the microwave shielding cover 323 is inserted into the receiving groove 3221 through the opening 3222. A first abutting surface 3223 and a second abutting surface 3224 are provided in the receiving groove 3221, intersecting the longitudinal direction x of the heating tube 321. The first abutting surface 3223 is located between the second abutting surface 3224 and the opening 3222 of the receiving groove 3221.

[0085] The heating tube 321 and the microwave shielding cover 323 are respectively inserted into the receiving groove 3221 through the opening 3222, the mounting portion 3234 of the microwave shielding cover 323 abuts against the first abutting surface 3223, and the connecting portion 3212 of the heating tube 321 abuts against the second abutting surface 3224. The first abutting surface 3223 and the second abutting surface 3224 are used to limit the mounting portion 3234 and the connecting portion 3212 respectively, thereby reducing the displacement of the microwave shielding cover 323 and the heating tube 321 in the longitudinal direction x of the heating tube 321, and further reducing the situation where the heating efficiency of the heating element 32 is affected by the movement of the microwave shielding cover 323 or the heating tube 321.

[0086] It should be noted that a second protrusion is provided within the receiving groove 3221, and a second abutting surface 3224 is formed on the second protrusion. The second abutting surface 3224 can be arranged parallel to or at an angle to the plane of the opening 3222 of the receiving groove 3221. The side surface of the connecting portion 3212 that abuts the second abutting surface 3224 is adapted to mate with the first abutting surface 3223.

[0087] In addition, a first limiting portion 32121 is provided on the connecting portion 3212 of the heating tube 321, and a second limiting portion 3225 is provided on the second protruding portion, wherein the first limiting portion 32121 is a first plane formed on the outer peripheral surface of the connecting portion 3212, and the first plane is connected to the end of the connecting portion 3212, and the second limiting portion 3225 is a second plane formed on the second protruding portion, and the second plane is arranged to intersect with the second abutting surface 3224. When the connecting portion 3212 is inserted into the receiving groove 3221, the first plane of the connecting portion 3212 is aligned with the second plane of the receiving groove 3221. The connecting portion 3212 is then inserted into the receiving groove 3221 through the opening 3222. When the connecting portion 3212 is inserted into place, part of the connecting portion 3212 rests on the second abutting surface 3224, while the other part of the connecting portion 3212 is accommodated in the receiving space formed by the second protrusion and the inner wall of the receiving groove 3221. The first plane and the second plane are in contact with each other. The contact between the first plane and the second plane can limit the rotation of the heating tube 321 relative to the mounting base 322, thereby reducing the impact of the heating efficiency caused by the rotation of the heating tube 321.

[0088] In some embodiments of the present application, as shown in Figures 2 and 7 to 9, the heating tube 321 further includes a wiring portion 3213, which is electrically connected to the heating element and extends through the connecting portion 3212 of the heating tube 321. A through hole 3227 is formed in the mounting base 322, which communicates with the interior of the receiving groove 3221 in the longitudinal direction x of the heating tube 321.

[0089] When assembling the heating tube 321, the connecting portion 3212 of the heating tube 321 is inserted into the receiving groove 3221 through the opening 3222. The wiring portion 3213 protruding from the connecting portion 3212 passes through the receiving groove 3221 and the through-hole 3227. When the mounting base 322 and the heating tube 321 are properly installed, part of the wiring portion 3213 protrudes from the outside of the mounting base 322. The provision of the wiring portion 3213 allows for electrical extraction of the heating element, thereby improving wiring operation during use of the heating element 32.

[0090] It should be pointed out that, in the present application, the wiring portion 3213 is a flat metal piece, and the shape of the through hole 3227 is adapted to the shape of the wiring portion 3213 to facilitate the wiring portion 3213 to pass through.

[0091] In addition, a connecting hole 3228 is provided on the mounting base 322. The connecting hole 3228 is connected to the through hole 3227 and the two are arranged opposite each other. When the heating tube 321 and the mounting base 322 are installed in place, fasteners such as screws are used to pass through the connecting hole and cooperate with the wiring part 3213 located in the through hole to fix the wiring part 3213 to the mounting base 322.

[0092] In some embodiments of the present application, as shown in Figures 3 to 6, a transmission region 3231 is provided on the microwave shielding cover 323. The transmission region 3231 is provided corresponding to the heat generating portion 3211 of the heat pipe 321. Along the length direction x of the heat pipe 321, the transmission region 3231 at least partially covers the heat generating portion 3211. Along the circumferential direction of the heat pipe 321, the transmission region 3231 also at least partially covers the heat generating portion 3211. A through hole 32311 is provided in the transmission region 3231. There is at least one through hole 32311, and the maximum opening size of the through hole 32311 is less than one-quarter of the microwave wavelength.

[0093] Specifically, the microwave shielding cover 323 is disposed outside the heating tube 321, shielding the heating tube 321 from microwaves. This reduces the risk of ignition when the heating element 32 operates in a microwave environment. A transmissive region 3231 having a through hole 32311 is provided on the microwave shielding cover 323, and the size of the through hole 32311 is adjusted to minimize obstruction of the heating tube 321 by the microwave shielding cover 323. This allows for rapid heat release from the heating tube 321 during operation, effectively improving the heating efficiency of the heating element 32.

[0094] It should be understood that the maximum opening size of the through hole 32311 is set to be smaller than a quarter wavelength of the microwave. When the microwave reaches the position of the through hole 32311, the microwave cannot pass through the through hole 32311 and reach the position of the heating tube 321, so as to reduce the problem of ignition of the heating element of the heating tube 321. At the same time, the heat generated by the heating tube 321 during operation can be directly radiated to the outside of the microwave shielding cover 323 through the through hole 32311, reducing the obstruction of the microwave shielding cover 323 to the heat release of the heating tube 321.

[0095] It should be noted that in the present application, along the length direction x of the heating tube 321, the transmissive region 3231 may cover all or part of the length of the heating tube 321. Simultaneously, along the circumferential direction of the heating tube 321, the transmissive region 3231 may cover all or part of the circumferential surface of the heating tube 321. Whether along the length direction x of the heating tube 321 or along the circumferential direction of the heating tube 321, the larger the area of ​​the heating tube 321 covered by the transmissive region 3231, the less shielding the heating tube 321 will provide. This allows more heat from the heating tube 321 to be radiated to the outside of the microwave shielding cover 323 through the through-hole 32311, thereby improving the heating efficiency of the heating element 32.

[0096] In the present application, the number of through holes 32311 can be 1, 2, 10, 50, 100, 300, 400, 500, 600, 800, 1000, etc. When the number of through holes 32311 is greater, the microwave shielding cover 323 blocks less heat from the heating tube 321. As the number of through holes 32311 increases, the heating efficiency of the heating element 32 can be improved.

[0097] In some embodiments of the present application, as shown in Figures 3 to 6 , at least two through holes 32311 are provided in the transmissive region 3231. All of the through holes 32311 are dispersed within the transmissive region 3231. Among all of the through holes 32311, any two adjacent through holes 32311 are spaced apart by a distance greater than 0.5 mm.

[0098] Specifically, the number of through holes 32311 is set to at least two, thereby increasing the number of through holes 32311, increasing the opening area on the microwave shielding cover 323, and improving the permeability of the microwave shielding cover 323. On the basis of achieving microwave shielding, the obstruction of the heating tube 321 can be further reduced, so that the heating efficiency of the heating element 32 can be further improved.

[0099] It should be understood that the distance between two adjacent through holes 32311 can be 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc. Specifically, when the distance between two adjacent through holes 32311 is smaller, the permeability of the shielding cover is higher, and when the distance between two adjacent through holes 32311 is larger, the structural strength of the shielding cover is higher.

[0100] In this application, the microwave shielding cover 323 is a metal part (such as a stainless steel part), and the through hole 32311 is formed on the shielding cover by stamping. At this time, the minimum distance between two adjacent through holes 32311 is 1 mm to meet the requirements of punching processing. At the same time, the microwave shielding cover 323 can have a certain structural strength, so that the protection performance of the microwave shielding cover 323 on the heating tube 321 can be improved.

[0101] In some embodiments of the present application, as shown in Figures 3 to 6, a plurality of through holes 32311 are provided in the projection area of ​​the microwave shielding cover 323, and the plurality of through holes 32311 are dispersed within the transmission area 3231. The porosity of the transmission area 3231 is m, and 0.5≤m≤0.8.

[0102] It should be understood that when the porosity in the transmission area 3231 is less than 0.5, the opening area in the transmission area 3231 is small, which has limited effect on improving the heating efficiency of the heating element 32. When the porosity in the transmission area 3231 is greater than 0.8, the opening area in the transmission area 3231 is larger, but the structural strength of the microwave shielding cover 323 deteriorates.

[0103] In the present application, by setting the porosity of the transmission area 3231, the microwave shielding cover 323 can be used to effectively shield the microwaves, and the microwave shielding cover 323 has good structural strength, thereby improving the protection performance of the microwave shielding cover 323 on the heating tube 321, and further reducing the damage of the heating tube 321 caused by impact.

[0104] In the present application, the area of ​​the transmission area 3231 is Aall, the opening area of ​​a single through hole 32311 is Ahole, the number of through holes 32311 is n, and the porosity of the transmission area 3231 is B, where B = n*Ahole / Aall. Taking the transmission area 3231 as a rectangle and the through hole 32311 as a circular hole as an example, Aall = L*M, where L is the length of one side of the rectangular transmission area 3231, and M is the length of the other side of the rectangular transmission area 3231. Ahole = πr2, where r is the radius of the circular through hole 32311.

[0105] It should be noted that, in the present application, the value of the porosity m can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8.

[0106] As shown in FIG10 , in FIG10 , the horizontal axis is the time axis, the vertical axis is the temperature axis, m1 is 0.8, m2 is 0.6, m3 is 0.55, and m4 is 0.5. By comparison, it can be seen that when heated to the same temperature, the greater the porosity, the shorter the time used.

[0107] In some embodiments of the present application, as shown in Figures 3 to 6, a plurality of through holes 32311 are provided on the transmission area 3231 of the microwave shielding cover 323, wherein the plurality of through holes 32311 form a plurality of rows of hole groups, and the through holes 32311 in each row of hole groups are arranged in a straight line, and each hole group is arranged along the length direction x of the heating tube, wherein, along the circumferential direction of the heating tube 321, the plurality of rows of hole groups are arranged at intervals, and the two adjacent through holes 32311 in the two adjacent rows of hole groups are staggered. Specifically, the plurality of through holes 32311 are arranged into a plurality of rows of hole groups, so as to facilitate processing and manufacturing, so that the processing efficiency can be improved. At the same time, the porosity of the transmission area 3231 is further improved by staggering the two adjacent through holes 32311 in the two adjacent rows of hole groups, so that the heating efficiency of the heating element 32 can be further improved.

[0108] In some embodiments of the present application, a plurality of through holes 32311 are provided on the transmission area 3231 of the microwave shielding cover 323, wherein the plurality of through holes 32311 form a plurality of rows of hole groups, and the through holes 32311 in each row of hole groups are arranged in a straight line, and each hole group is arranged along the circumferential direction of the heating tube, wherein, along the length direction x of the heating tube 321, the plurality of rows of hole groups are arranged at intervals, and the two adjacent through holes 32311 in the two adjacent rows of hole groups are staggered. Specifically, the plurality of through holes 32311 are arranged into a plurality of rows of hole groups, so as to facilitate processing and manufacturing, so that the processing efficiency can be improved. At the same time, staggering the through holes 32311 in the two adjacent rows of hole groups can further improve the porosity of the transmission area 3231, so that the heating efficiency of the heating element 32 can be further improved.

[0109] In some embodiments of the present application, a transmission area 3231 and a reflection area 3232 are provided on the microwave shielding cover 323, wherein the transmission area 3231 and the reflection area 3232 are arranged opposite to each other, and along the circumferential direction of the heating tube 321, opposite sides of the reflection area 3232 are respectively connected to the transmission area 3231.

[0110] It should be understood that the side of the reflective region 3232 facing the heat pipe 321 is a reflective surface. This surface has a reflective function. When the heat radiation generated by the heating element strikes the reflective surface, it reflects the radiation, thereby changing the propagation direction of the radiation. Because the reflective region 3232 is positioned opposite the transmissive region 3231, the radiation reflected by the reflective surface can radiate out of the microwave shielding cover 323 through the through-hole 32311 of the transmissive region 3231.

[0111] Specifically, when the heating element 32 is used in the microwave cooking device 100, the microwave shield 323 has a side with a transmissive region 3231 that communicates with the cooking cavity and is positioned opposite the food being heated. When the heating element 32 is in operation, the heating element within the heating tube 321 is energized, emitting light and heat. The heat generated by the heating element is rapidly radiated into the cooking cavity through the through-holes 32311 in the transmissive region 3231, thereby heating and cooking the food. By providing the reflective region 3232, heat released by the heating element on one side of the reflective region 3232 is reflected by the reflective region 3232 from the transmissive region 3231, radiating into the cooking cavity through the through-holes 32311 in the transmissive region 3231. This allows more heat generated by the heating tube 321 to be rapidly radiated into the cooking cavity, further improving the heating efficiency of the heating element 32.

[0112] It should be noted that a reflective coating (such as a silver coating) may be provided on the reflective surface to further enhance the reflective capability of the reflective surface and further enhance the heating efficiency of the heating element 32 .

[0113] In some embodiments of the present application, as shown in Figure 6, a transmission area 3231 and a reflection area 3232 are provided on the microwave shielding cover 323, wherein along the circumferential direction of the heating tube 321, opposite sides of the reflection area 3232 are respectively connected to the transmission area 3231, and in the circumferential direction of the heating tube 321, the central angle formed by the transmission area 3231 is in the range of 100° to 300°.

[0114] Specifically, when the heating element 32 is in operation, the heating element within the heating tube 321 is energized, emitting light and heat. This heat is then rapidly radiated into the cooking cavity via the through-holes 32311 of the transmissive region 3231, heating and cooking the food. The greater the coverage of the transmissive region 3231 along the circumference of the heating tube 321, the less effective the microwave shielding cover 323 is at blocking the heat from the heating tube 321. This means that more heat is directly radiated from the heating tube 321 to the outside of the microwave shielding cover 323.

[0115] When the heating element 32 is used in the microwave cooking device 100, the cooking cavity is arranged on one side of the heating element 32, and the transmission area 3231 is connected to the cooking cavity. Therefore, by controlling the area covered by the transmission area 3231 in the circumferential direction of the heating tube 321, the heat of the heating tube 321 can be directional radiated, thereby reducing heat loss and effectively improving the heating efficiency of the heating element 32.

[0116] In this application, the central angle formed by the transmissive region 3231 in the circumferential direction of the heating tube 321 is a (the central angle formed by the reflective region 3232 in the circumferential direction of the heating tube 321 is b, where b = 360° - a), where 100° ≤ a ≤ 300°. When the heating element 32 is used in the microwave cooking device 100, the heat radiation area of ​​the heating element 32 can be increased, effectively reducing energy consumption while improving heating efficiency.

[0117] It should be pointed out that the specific value of a can be 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, 180°, 181°, 182°, 183°, 184°, 185°, 187°, 190°, 200°, 210°, 230°, 240°, 250°, 260°, 270°, 280°, 290°, and 300°.

[0118] In some embodiments of the present application, the shape of the through hole 32311 includes but is not limited to a circle, a triangle, an ellipse, a quadrilateral, or a pentagon, etc. By setting the shape of the through hole 32311, the through hole 32311 can be set according to specific application scenarios to meet actual usage requirements.

[0119] It should be understood that, in the present application, when a transmissive region 3231 includes multiple through-holes 32311, the shapes of the through-holes 32311 can be identical, partially identical, or completely different. When the shapes of the through-holes 32311 are identical, processing is facilitated, thereby improving processing efficiency. When the shapes of the through-holes 32311 are partially identical or completely different, the porosity of the transmissive region 3231 can be increased by changing the shapes of the through-holes 32311, thereby improving the permeability of the transmissive region 3231.

[0120] In some embodiments of the present application, as shown in FIG3 to FIG6 , the transmission area 3231 of the microwave shielding cover 323 includes a through hole 32311 . The shape of the through hole 32311 is set to be circular, and the diameter of the through hole 32311 is d, wherein 3mm≤d≤8mm.

[0121] Specifically, the through hole 32311 is configured as a circle for ease of processing and manufacturing. Furthermore, the diameter of the circular through hole 32311 is set between 3 mm and 8 mm. This effectively increases the area of ​​the opening while still meeting the requirement for microwave shielding, thereby increasing the porosity of the transmission area 3231 and thereby improving the heating efficiency of the heating element 32.

[0122] It should be pointed out that the specific value of d can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, and 8mm.

[0123] In addition, when there are multiple through holes 32311, the diameters of the through holes 32311 can be all the same, some the same, or all different. When the diameters of the through holes 32311 are all the same, processing can be facilitated, thereby improving processing efficiency. When the diameters of the through holes 32311 are partially the same or completely different, the porosity of the transmissive region 3231 can be increased by changing the diameter of the through holes 32311, thereby improving the permeability of the transmissive region 3231.

[0124] In some embodiments of the present application, along the axial direction perpendicular to the heating tube 321 , the cross section of the microwave shielding cover 323 is an annular structure, and the annular structure includes but is not limited to a triangle, a quadrilateral, a pentagon, a circle or an ellipse.

[0125] Specifically, by setting the annular structure, the microwave shielding cover 323 can be set according to specific application scenarios to meet actual use requirements.

[0126] It should be understood that the shape of the annular structure is consistent with the cross-sectional shape of the heating tube 321 (a cross-sectional shape perpendicular to the axial direction of the heating tube 321), thereby enabling the microwave shielding cover 323 to better adapt to the heating tube 321. For example, if the cross-sectional shape of the heating tube 321 (a cross-sectional shape perpendicular to the axial direction of the heating tube 321) is circular, the annular structure is also circular.

[0127] In some embodiments of the present application, the heating tube 321 is coaxially arranged with the microwave shielding cover 323. By coaxially arranging the two, the heating tube 321 and the microwave shielding cover 323 are arranged at equal distances in a direction perpendicular to the longitudinal direction x of the heating tube 321, thereby reducing the possibility of local deformation of the microwave shielding cover 323 and damage to the heating tube 321.

[0128] In some embodiments of the present application, the wall thickness of the microwave shielding cover 323 is greater than or equal to 1 mm. By setting the microwave shielding cover 323, the overall weight can be effectively controlled while the microwave shielding cover 323 can shield microwaves, thereby effectively controlling the overall weight of the heating element 32.

[0129] It should be noted that, as shown in FIG6 , in the present application, the thickness of the microwave shielding cover 323 is d, where the value of d can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm.

[0130] As shown in FIG. 1 , the second aspect of the present application provides a heating assembly 30 , which includes the heating element 32 as described above.

[0131] When the heating assembly 30 in the present application is used in a microwave cooking appliance 100, in the process of simultaneously heating the food in the cooking cavity with microwaves and the heating tube 321 of the heating element 32, the heat of the heating tube 321 is radiated into the cooking cavity through the microwave shielding cover 323 to heat the food in the cooking cavity. The microwaves in the cooking cavity cannot reach the position of the heating tube 321 under the shielding of the microwave shielding cover 323, thereby reducing the problem of ignition of the heating tube 321 when used in a microwave environment, thereby improving safety during use.

[0132] It should be noted that the heating assembly 30 also includes a heat shield 31, which has a mounting space. The heating element 32 cooperates with the heat shield 31 so that at least the portion of the heating element of the heating tube 321 is disposed within the mounting space. When the heating assembly 30 is used in the microwave cooking device 100, the heat shield 31 is mounted and fixed to the housing 10 of the microwave cooking device 100. The open end of the heat shield 31 communicates with the cooking cavity within the housing 10, allowing the heating tube 321 to heat and cook food within the cooking cavity.

[0133] As shown in FIG. 1 , the third aspect of the present application provides a microwave cooking appliance 100 , which includes a heating assembly 30 as described above.

[0134] According to the microwave cooking device 100 of the present application, in the process of simultaneously heating the food in the cooking cavity by using microwaves and the heating tube 321 in the heating assembly 30, the heat of the heating tube 321 is radiated into the cooking cavity through the microwave shielding cover 323 to achieve heating of the food in the cooking cavity. The microwaves in the cooking cavity cannot reach the position of the heating tube 321 under the shielding of the microwave shielding cover 323, thereby reducing the problem of ignition of the heating tube 321 when used in a microwave environment, thereby improving safety during use.

[0135] It should be pointed out that, as shown in Figure 1, the microwave cooking appliance 100 also includes a box body 10 and a door body 20, wherein a cooking cavity is provided on the box body 10, and the cooking cavity has a take-in and put-out opening. The door body 20 is pivotally connected to the box body 10, and the take-in and put-out opening is opened or closed by pivoting the door body 20 relative to the box body 10.

[0136] In the present application, the above-mentioned microwave cooking appliance can be a microwave oven or a microwave-steam-bake combination machine, etc. For the convenience of description, the present application only takes the microwave cooking appliance as an example of a microwave oven. For the structure of other parts of the microwave oven, please refer to the prior art, and this application will not go into details here.

[0137] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A heating element for a microwave cooking device, characterized in that: The heating element comprises: A heating tube, the heating tube comprising a heating element, the heating element being a carbon fiber heating element or a graphite heating element; A microwave shielding cover, wherein the microwave shielding cover is arranged on the outside of the heating tube, the microwave shielding cover includes a transmission area, the transmission area is arranged opposite to the heating element, along the length direction or the circumferential direction of the heating tube, the transmission area at least covers a part of the heating element, the transmission area includes at least one through hole, and the maximum opening size of any through hole is less than one quarter of the wavelength of the microwave emitted by the microwave cooking device.

2. The heating element according to claim 1, characterized in that The number of the through holes is at least two, all of the through holes are dispersedly arranged in the transmission area, and the spacing distance between any two adjacent through holes is greater than 0.5 mm.

3. The heating element according to claim 2, characterized in that: The porosity of the transmission area is in the range of 0.5 to 0.

8.

4. The heating element according to claim 2, characterized in that: Along the circumferential direction of the heating tube, at least two adjacent through holes among all the through holes are staggered.

5. The heating element according to claim 1, characterized in that: The microwave shielding cover also includes a reflective area, which is arranged opposite to the transmissive area. Along the circumferential direction of the heating tube, one side of the reflective area is connected to one side of the transmissive area, and the other side of the reflective area is connected to the other side of the transmissive area.

6. The heating element according to claim 5, characterized in that Along the circumferential direction of the heating tube, the central angle formed by the transmission area is within the range of 100° to 300°.

7. The heating element according to claim 1, characterized in that The through hole is in a shape of circle, ellipse, triangle, quadrilateral or pentagon.

8. The heating element according to claim 7, characterized in that The through hole is circular in shape, and the diameter of the through hole is d, wherein 3mm≤d≤8mm.

9. The heating element according to any one of claims 1 to 8, characterized in that: Along the axial direction perpendicular to the heating tube, the cross section of the microwave shielding cover is an annular structure, and the annular structure is circular, elliptical, triangular, quadrilateral or pentagonal.

10. The heating element according to any one of claims 1 to 8, characterized in that: The microwave shielding cover is coaxially arranged with the heating tube; And / or the wall thickness of the microwave shielding cover is greater than or equal to 1 mm.

11. A heating component, characterized in that: The heating assembly comprises a heating element according to any one of claims 1 to 10.

12. A microwave cooking device, characterized in that: The microwave cooking appliance comprises the heating assembly according to claim 11.

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