Microwave shielding door and microwave steaming oven comprising the same

Abstract

The present application provides a microwave shielding door and a microwave steaming oven comprising the same, the microwave shielding door comprising: a first shielding plate forming a first shielding area towards a region of a microwave cooking cavity; a second shielding plate connected with a first face of the first shielding plate, an area of the second shielding plate being greater than that of the first shielding plate; a door body on which a second face of the second shielding plate is installed; and a sealing ring arranged in a spaced manner with the first shielding plate, the second shielding plate inside the sealing ring forming a second shielding area towards the region of the microwave cooking cavity. Through the embodiment of the present application, the microwave leaked from the microwave device can be effectively shielded.

Description

TECHNICAL FIELD

[0001] The present application relates generally to the technical field of kitchen electrical appliance equipment, and in particular to a microwave shielding door and a microwave steaming oven comprising the same. BACKGROUND

[0002] A microwave device such as a microwave oven or a microwave steaming oven generates microwaves to heat food when in operation. Before heating, the door of the microwave oven or the microwave steaming oven is opened, the food to be heated is placed in a cavity of the microwave oven or the microwave steaming oven, and then the door is closed to heat the food to be heated by microwaves. Since the door is not fixedly connected to the cavity, it is inevitable that microwaves leak out through the door during the heating process. Microwave leakage is one of the problems of microwave devices. Excessive microwave leakage may interfere with electrical signals and damage electronic components, causing device failure, or even harm to the human body. The national standard requires that the microwave leakage be less than or equal to 5 mW / cm2(microwave frequency 2450 MHz) at a distance of 5 cm from the device.

[0003] The contents of the background section merely represent the knowledge of the inventors and do not necessarily represent the state of the art in the field. SUMMARY

[0004] The microwave shielding door structure of the present application solves the problem of microwave leakage in the prior art by using a double shielding structure of a first shielding plate, a second shielding plate, and a sealing ring.

[0005] In view of at least one defect of the prior art, the present application provides a microwave shielding door, comprising:

[0006] a first shielding plate, the first shielding plate forming a first shielding area towards a region of a microwave cooking cavity;

[0007] a second shielding plate, the first shielding plate being connected to a first face of the second shielding plate, the second shielding plate having an area greater than that of the first shielding plate;

[0008] a door body, a second face of the second shielding plate being mounted on the door body; and

[0009] a sealing ring, the sealing ring being arranged in a spaced manner with the first shielding plate, the second shielding plate on the inner side of the sealing ring forming a second shielding area towards a region of the microwave cooking cavity.

[0010] According to an aspect of the present application, the sealing ring is fixed around the second shielding plate.

[0011] According to an aspect of the present application, the sealing ring is arranged on the second shielding plate.

[0012] According to one aspect of the present application, a groove is formed on the door body, and the sealing ring is fixed in the groove.

[0013] According to one aspect of the present application, a connecting member is further included, and the first shielding plate is connected to the first surface of the second shielding plate through the connecting member.

[0014] According to one aspect of the present application, the door body includes a door outer plate and a door inner plate fixedly connected, and the second surface of the second shielding plate is mounted on the door inner plate.

[0015] According to one aspect of the present application, a door handle and a door handle fixing box are further included, and the upper side of the door outer plate and the door inner plate is provided with a hole slot, and the door handle is mounted on the outer side of the door outer plate through the hole slot and the door handle fixing box.

[0016] According to one aspect of the present application, the periphery of the first shielding plate includes a bending part towards the second shielding plate, and the bending part is provided with a choke groove structure.

[0017] The present application further relates to a microwave steaming oven, comprising:

[0018] a box body, a hollow part inside the box body forming a cooking cavity;

[0019] a microwave generating part configured to generate microwaves and conduct the microwaves into the cooking cavity to heat food to be heated;

[0020] a heating device and a hot air fan configured to form hot air from the heat generated by the heating device and send the hot air into the cooking cavity;

[0021] a steam generator configured to blow steam generated and released by the steam generator into the cooking cavity;

[0022] a circulating fan configured to uniformly distribute the hot air and / or the steam in the cooking cavity; and

[0023] The microwave shielding door according to any one of the above is arranged at the front of the box body and configured to shield microwaves leaked from the cooking cavity to the outside when the microwave steaming oven is working.

[0024] According to one aspect of the present application, a door connecting part is further included, and the lower side of the door body of the microwave shielding door is provided with a hole slot capable of accommodating the door connecting part, and the microwave shielding door can be opened and closed through the door connecting part.

[0025] According to one aspect of the present application, a wind tunnel is further included above the cooking cavity, wherein the hot air blown by the heating device and the hot air fan is dispersed into the cooking cavity along the wind tunnel.

[0026] According to one aspect of the present application, wherein the end of the wind tunnel away from the heating device is tapered, the heating device is a carbon heating device, the circulating fan is a turbo fan, and the steam generator is a steam boiler.

[0027] According to one aspect of the present application, a temperature sensor is further included, which is arranged in the wind tunnel, away from the side of the heating device and the hot air fan, and is configured to sense the temperature of the hot air blown by the heating device and the hot air fan.

[0028] According to one aspect of the present application, a controller is further included, which is coupled with the microwave generating part, the heating device, the steam generator and the temperature sensor respectively, and is configured to control the microwave generating part to generate microwaves, monitor the humidity in the cooking cavity, control the steam generator to generate steam and control the heating temperature of the heating device according to the temperature of the hot air sensed by the temperature sensor and the humidity.

[0029] According to one aspect of the present application, a hot air hole plate and a steam hole plate are further included, the hot air hole plate is arranged at the junction of the wind tunnel and the cooking cavity, and a plurality of small holes are arranged on the hot air hole plate, the hot air is dispersed into the cooking cavity through the hot air hole plate, the steam hole plate is arranged below the side wall or the bottom of the cooking cavity, and a plurality of small holes are arranged on the steam hole plate, the steam is dispersed into the cooking cavity through the steam hole plate.

[0030] According to one aspect of the present application, wherein a plurality of steam ports are arranged below the rear part or the side wall of the cooking cavity, the steam is dispersed into the cooking cavity through the plurality of steam ports, and a partition wall is further included between the circulating fan and the cooking cavity, a plurality of circulating holes are arranged on the partition wall, wherein the circulating fan is configured to make the gas in the cooking cavity leave the cooking cavity through a part of the circulating holes and re-enter the cooking cavity through another part of the circulating holes.

[0031] The embodiments of the present application improve the sealing property and microwave shielding property of the microwave shielding door by arranging the first shielding plate, the second shielding plate and the sealing ring on the microwave shielding door respectively and the positional relationship between the sealing ring and the first shielding plate and the second shielding plate, and effectively avoid the situation that the microwaves leak outwards. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of the specification, illustrate embodiments of the application and are used to explain the application, but are not intended to limit the application. In the drawings:

[0033] Figure 1 A schematic view of a microwave shielding door according to an embodiment of the application is shown;

[0034] Figure 2 An exploded view of a microwave shielding door according to an embodiment of the application is shown;

[0035] Figure 3 A side view of the internal structure of a microwave steaming oven according to an embodiment of the application is shown; and

[0036] Figure 4 A side view of the internal structure of a microwave steaming oven according to another embodiment of the application is shown. DETAILED DESCRIPTION

[0037] In the following, only certain exemplary embodiments are described in simple terms. As will be realized by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of the application. The drawings and description are, therefore, to be considered in all respects only as illustrative and not restrictive.

[0038] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0039] In the description of the present application, it is necessary to point out that unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, or electrical connection or can communicate with each other; can be directly connected, or indirectly connected through the intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0041] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0042] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0043] Figure 1 A schematic view of a microwave shielding door according to an embodiment of the present application is shown. Figure 2 An exploded view of a microwave shielding door according to an embodiment of the present application is shown. As Figure 1 and Figure 2As shown, the microwave shielding door 10 comprises a first shielding plate 11, a second shielding plate 12, a door body 13, and a sealing ring 14. The first shielding plate 11 forms a first shielding area towards the area of the microwave cooking cavity. The first shielding plate 11 is connected with a first surface 12-1 of the second shielding plate 12, and the area of the second shielding plate 12 is larger than that of the first shielding plate 11. A second surface 12-2 of the second shielding plate 12 is installed on the door body 13. The sealing ring 14 is arranged in a spaced manner with the first shielding plate 11, i.e. the inner side of the sealing ring 14 is not in direct contact with the outer side of the first shielding plate 11, but is arranged at a certain distance. The second shielding plate 12 on the inner side of the sealing ring 14 forms a second shielding area towards the area of the microwave cooking cavity. Therefore, the second shielding area is based on the first shielding area, and further increases the part of the area of the second shielding plate 12 surrounded by the sealing ring 14 and exceeding the area of the first shielding plate 11.

[0044] As shown in the drawings, Figure 1 The first shielding plate 11 is protrudingly arranged on the second shielding plate 12, so that when the microwave shielding door 10 is closed, the first shielding plate 11 extends into the cooking cavity of the microwave steaming oven, and is used for shielding the microwaves generated in the microwave steaming oven to prevent leakage. According to an embodiment of the present application, the gap between the first shielding plate 11 and the front plate of the microwave steaming oven is 1-2 mm (i.e. the gap between the outer periphery of the first shielding plate 11 and the cooking cavity). The second shielding plate 12 and the sealing ring 14 are attached to the surface of the front plate, and the second shielding plate 12 is used to shield the microwaves that leak out through the gap, so that the first shielding plate 11 and the second shielding plate 12 constitute a double insurance for shielding microwaves. At the same time, the sealing ring 14 plays a role of sealing steam, so that the steam in the microwave steaming oven does not overflow outward.

[0045] According to an embodiment of the present application, as shown in the drawings, Figure 1 The sealing ring 14 is fixed around the second shielding plate 12. Alternatively, the sealing ring 14 is tightly attached around the second shielding plate 12 by tension.

[0046] According to an embodiment of the present application, the sealing ring 14 is arranged on the second shielding plate 12. Specifically, the sealing ring 14 is arranged in the area surrounded by the second shielding plate 12 and exceeding the first shielding plate 11, and is arranged at a certain distance from the first shielding plate 11.

[0047] According to one embodiment of the present application, the door body 13 is provided with a groove (not shown in the figure) surrounding the second shielding plate 12, the shape of the groove corresponding to the shape of the sealing ring 14, so that the sealing ring 14 is fixed in the groove and is not easy to fall out.

[0048] Compared with the prior art, the sealing ring 14 of the present application is not in direct contact with the first shielding plate 11, but is arranged separately from the first shielding plate 11 as in the above embodiments. Such an arrangement not only reduces the processing requirements and processing precision of the first shielding plate 11 and the second shielding plate 12 during the production and processing of the microwave shielding door 10, but also better shields the leaked microwaves.

[0049] According to one embodiment of the present application, as shown in Figure 1 and Figure 2 , the microwave shielding door 10 further comprises a connecting piece 15, and the first shielding plate 11 and the first face 12-1 of the second shielding plate 12 are connected by the connecting piece 15. Optionally, the connecting piece 15 is fixedly connected with the first shielding door 11 and is configured to support the first shielding plate 11.

[0050] According to one embodiment of the present application, as shown in Figure 1 and Figure 2 , the door body 13 comprises a fixedly connected outer door panel 13-1 and an inner door panel 13-2, and the second face 12-2 of the second shielding plate 12 is mounted on the inner door panel 13-2.

[0051] According to one embodiment of the present application, as shown in Figure 1 and Figure 2 , the microwave shielding door 10 further comprises a door handle 16 and a door handle fixing box 17. The upper side of the outer door panel 13-1 and the inner door panel 13-2 is provided with a hole slot 18, and the door handle 16 is mounted on the outer side of the outer door panel 13-1 through the hole slot 18 and the door handle fixing box 17. The door handle 16 and the door handle fixing box 17 cooperate to control the opening and closing of the microwave shielding door 10 by rotating the door handle 16.

[0052] According to one embodiment of the present application, as shown in Figure 1 and Figure 2 , the periphery of the first shielding plate 11 comprises a bending portion 11-1 facing the second shielding plate 12, and the bending portion 11-1 is provided with a choke groove structure. Optionally, the depth of the choke groove in the choke groove structure is one quarter of the wavelength of microwaves.

[0053] Figure 3 A side view of the internal structure of a microwave steaming oven according to one embodiment of the present application is shown. As shown inFigure 3 As shown, the microwave steaming oven 100 comprises a cabinet 110, a microwave generating portion 120, a heating device 130 and a hot air fan 140, a steam generator 150, a circulating fan 160, and the microwave shielding door 10. The hollow portion inside the cabinet 110 forms a cooking cavity 101, in which food is heated and processed. The microwave generating portion 120 is optionally arranged at the top of the cooking cavity 101, configured to generate microwaves and conduct the microwaves into the cooking cavity 101 to heat the food to be heated. The heating device 130 and the hot air fan 140 are optionally arranged at the rear of the cooking cavity 101, configured to form hot air from the heat generated by the heating device 130 and send the hot air into the cooking cavity 101. The steam generator 150 is optionally arranged at the rear of the cooking cavity 101, configured to blow steam generated and released by the steam generator 150 into the cooking cavity 101. The circulating fan 160 is optionally arranged at the rear of the cooking cavity 101, in front of the steam generator 150, configured to make the hot air and / or the steam evenly distributed in the cooking cavity 101. The microwave shielding door 10 is arranged at the front of the cabinet, configured to shield the microwaves leaked from the cooking cavity 101 to the outside of the microwave steaming oven 100 when the microwave steaming oven 100 is working.

[0054] According to one embodiment of the present application, the microwave steaming oven 100 further comprises a door connecting portion (not shown in the figure), and holes and grooves capable of accommodating the door connecting portion are arranged at the lower part of the door body of the microwave shielding door 100, so that the microwave shielding door 100 can be opened and closed through the door connecting portion.

[0055] According to one embodiment of the present application, as shown in Figure 3 As shown, the microwave steaming oven 100 further comprises an air duct 170 above the cooking cavity 101, wherein the end of the air duct 170 away from the heating device 130 gradually narrows. Optionally, the air duct 170 can start to narrow from the end close to the heating device 130, or start to narrow from any part of the middle of the air duct 170 in the direction away from the heating device 130, so that the hot air is dispersed into the cooking cavity 101 along the air duct 170. The hot air fan 140 is arranged at the rear of the heating device 130, and when the heating device 130 generates heat, the hot air fan 140 transmits the heat along the air duct 170 from the rear of the microwave steaming oven 100 to the front and downward to fill the entire air duct 170 and the cooking cavity 101.

[0056] Figure 4 A side view showing the internal structure of a microwave steaming oven according to another embodiment of the present application is shown. As shown in Figure 3 and Figure 4As shown, according to a preferred embodiment of the present application, the vertical cross-section of the air duct 170 is trapezoidal or triangular. When the hot air is transmitted along the air duct 170 from the rear of the microwave steaming oven 100 to the front, due to the "slope" 171 formed by one of the oblique sides of the trapezoidal or triangular cross-section, the hot air is forced to change its original horizontal flow direction and flow to the lower part of the microwave steaming oven 100, i.e. the cooking cavity 101, and gradually fill the entire cooking cavity 101.

[0057] According to an embodiment of the present application, as shown in Figure 3 and Figure 4 wherein the heating device 130 is a carbon heating tube, the circulating fan 160 is a turbo fan, and the steam generator 150 is a steam boiler. Specifically, the turbo fan is arranged to suck air from the inside of the cooking cavity 101 when the turbo fan rotates, and the air in the middle region of the cooking cavity 101 is sucked into the turbo fan and then blown out from the peripheral region of the turbo fan, so as to realize circulating ventilation in the cooking cavity 101 and finally make the steam uniformly fill the entire cooking cavity 101.

[0058] According to an embodiment of the present application, as shown in Figure 3 and Figure 4 The microwave steaming oven 100 further comprises a temperature sensor 180 arranged in the air duct 170, away from the heating device 130 and the hot air fan 140, and configured to sense the temperature of the hot air blown by the heating device 130 and the hot air fan 140.

[0059] According to an embodiment of the present application, the microwave steaming oven 100 further comprises a controller (not shown in the figure) coupled with the microwave generating portion 120, the heating device 130, the steam generator 150 and the temperature sensor 180, and configured to control the microwave generating portion 120 to generate microwaves, monitor the humidity in the cooking cavity 101, control the steam generator 150 to generate steam and control the heating temperature of the heating device 130 according to the temperature of the hot air sensed by the temperature sensor 180 and the humidity.

[0060] According to an embodiment of the present application, as shown in Figure 3 and Figure 4As shown, the microwave steaming oven 100 further comprises a hot air hole plate 172 and a steam hole plate 151. The hot air hole plate 172 is arranged at the junction of the air duct 170 and the cooking cavity 101, and is provided with a plurality of small holes. The hot air is dispersed into the cooking cavity 101 through the hot air hole plate 172, so that the hot air evenly fills the cooking cavity 101. The steam hole plate 151 is arranged at the bottom of the cooking cavity 101, and is provided with a plurality of small holes. The steam is dispersed into the cooking cavity 101 through the steam hole plate 151. Through the steam hole plate 151, the steam generated by the steam generator 150 can more evenly fill the cooking cavity 101, and better moisten the bottom of the food, retaining the fresh taste of the food.

[0061] According to one embodiment of the present application, as shown in Figure 3 and Figure 4 As shown, the rear lower portion or the sidewall of the cooking cavity 101 is provided with a plurality of steam outlets 152. The steam is dispersed into the cooking cavity 101 through the plurality of steam outlets 152. The plurality of steam outlets 152 have similar functions as the steam hole plate 151, and will not be described here. The microwave steaming oven 100 further comprises a partition wall 161 arranged between the circulating fan 160 and the cooking cavity 101. The partition wall 161 is provided with a plurality of circulating holes 162. The circulating fan 160 is configured such that the gas in the cooking cavity 101 exits the cooking cavity 101 through a portion of the circulating holes, and reenters the cooking cavity 101 through another portion of the circulating holes. The gas in the cooking cavity 101 is drawn into the circulating fan 160 through a portion of the circulating holes distributed in the central region of the circulating fan 160, and is released into the cooking cavity 101 through another portion of the circulating holes distributed around the periphery of the circulating fan 160. In this way, multiple alternating thermal cycles are achieved in the cooking cavity 101, the gas is fully mixed, and is evenly distributed in the cooking cavity 101. Figure 3 In the embodiment shown, the steam generator 150 is located behind the circulating fan 160, but the present application is not limited thereto. The steam generator 150 can also be located below the circulating fan 160. The steam is sent into the cooking cavity 101 through the steam hole plate 151 or the steam outlets 152 via a separate pipeline.

[0062] In addition, in the embodiment of the present application, the heating device 130 and the hot air fan 140 are used to generate hot air, and the steam generator 150 is used to generate steam and supply steam to the cooking cavity. The two are separate devices and can be controlled separately, i.e., can be turned on or off individually, so they can be flexibly applied to heating various types of food.

[0063] The microwave shielding door of the embodiment of the present application is respectively provided with a first shielding plate, a second shielding plate and a sealing ring, and the microwave leakage is effectively shielded through the double-shielded microwave shielding door structure, and the sealing tightness of the steam in the microwave steaming oven is ensured. Compared with the prior art, the microwave shielding door of the embodiment of the present application improves the microwave shielding property, and the microwave leakage measured by the probe head partially inserted into the door gap is reduced from the initial 10.5 Mw / cm2 to less than 1 mW / cm2 compared with the prior art. If the measurement is performed at a distance of 5 cm from the equipment according to the national standard, the microwave leakage is less than or equal to 0.3 mW / cm2 (microwave frequency 2450 MHz). Compared with the commercial microwave oven door body flat shielding metal plate in the inner ring, it is not easy to damage the shielding metal plate flatness and affect the microwave shielding effect in the operation.

[0064] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or the equivalent replacement of part of the technical features recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A microwave shielding door for a microwave steaming oven, the microwave steaming oven having a microwave cooking cavity, the microwave shielding door comprising: a first shielding plate forming a first shielding area towards a region of the microwave cooking cavity; a second shielding plate connected with a first face of the first shielding plate, the second shielding plate having an area greater than that of the first shielding plate; a door body on which a second face of the second shielding plate is mounted; and a sealing ring arranged in a spaced manner with the first shielding plate, the second shielding plate inside the sealing ring forming a second shielding area towards a region of the microwave cooking cavity; wherein the first shielding plate is protrudingly arranged on the second shielding plate, the periphery of the first shielding plate including a bending portion towards the second shielding plate, the bending portion being provided with a choke groove structure, the depth of the choke groove in the choke groove structure being one quarter of a wavelength of a microwave; when the microwave shielding door is closed, the first shielding plate extends into the microwave cooking cavity for shielding microwaves generated in the microwave steaming oven, the gap between the periphery of the first shielding plate and the cooking cavity being 1-2mm, the second shielding plate being used to shield the microwaves leaking outwards through the gap. 2.The microwave shielding door according to claim 1, wherein the sealing ring is fixed around the periphery of the second shielding plate. The microwave leakage at the door gap between the microwave steaming oven and the microwave shielding door is less than 1 mW / cm 2 The microwave leakage at a distance of 5 cm from the microwave steaming oven is ≤0.3 mW / cm 2 . 3.The microwave shielding door according to claim 1, wherein the sealing ring is arranged on the second shielding plate. 4.The microwave shielding door according to claim 1, wherein the door body is provided with a groove around the second shielding plate, and the sealing ring is fixed in the groove. 5.The microwave shielding door according to any one of claims 1-4, further comprising a connecting piece, the first shielding plate being connected with the first face of the second shielding plate through the connecting piece. 6.The microwave shielding door according to any one of claims 1-4, wherein the door body comprises a fixedly connected outer door plate and an inner door plate, and the second face of the second shielding plate is mounted on the inner door plate. 7.The microwave shielding door according to claim 6, further comprising a door handle and a door handle fixing box, the upper side of the outer door plate and the inner door plate being provided with a hole slot, and the door handle being mounted on the outer side of the outer door plate through the hole slot and the door handle fixing box. 8.A microwave steaming oven comprising: a cabinet, a hollow portion inside the cabinet forming a cooking cavity; a microwave generating portion configured to generate microwaves and conduct the microwaves into the cooking cavity to heat food to be heated; a heating device and a hot air fan configured to form hot air from heat generated by the heating device and send the hot air into the cooking cavity; a steam generator configured to generate steam and blow the steam into the cooking cavity; a circulating fan configured to uniformly distribute the hot air and / or the steam in the cooking cavity; and a microwave shielding door according to any one of claims 1-7, the microwave shielding door being arranged at the front of the cabinet and configured to shield microwaves leaking outwards from the cooking cavity when the microwave steaming oven is in operation. ​ 9. The microwave steaming oven of claim 8, further comprising a door connecting portion, wherein the lower portion of the door body of the microwave shielding door is provided with a hole slot capable of accommodating the door connecting portion, and the microwave shielding door is opened and closed through the door connecting portion.

10. The microwave steaming oven of claim 8 or 9, further comprising an air duct above the cooking cavity, wherein the hot air blown by the heating device and the hot air fan is dispersed into the cooking cavity along the air duct.

11. The microwave steaming oven of claim 10, wherein the end of the air duct away from the heating device is tapered, the heating device is a carbon heating device, the circulating fan is a turbo fan, and the steam generator is a steam boiler.

12. The microwave steaming oven of claim 10, further comprising a temperature sensor disposed in the air duct away from the heating device and the hot air fan, and configured to sense the temperature of the hot air blown by the heating device and the hot air fan.

13. The microwave steaming oven of claim 12, further comprising a controller coupled to the microwave generating portion, the heating device, the steam generator and the temperature sensor, and configured to control the microwave generating portion to generate microwaves, monitor the humidity in the cooking cavity, control the steam generator to generate steam and control the heating temperature of the heating device according to the temperature of the hot air sensed by the temperature sensor and the humidity.

14. The microwave steaming oven of claim 10, further comprising a hot air hole plate and a steam hole plate, wherein the hot air hole plate is disposed at the junction of the air duct and the cooking cavity, and is provided with a plurality of small holes, the hot air is dispersed into the cooking cavity through the hot air hole plate, and the steam hole plate is disposed below the sidewall or the bottom of the cooking cavity, and is provided with a plurality of small holes, the steam is dispersed into the cooking cavity through the steam hole plate.

15. The microwave steaming oven of claim 8 or 9, wherein a plurality of steam ports are disposed below the rear portion or the sidewall of the cooking cavity, the steam is dispersed into the cooking cavity through the plurality of steam ports, and the microwave steaming oven further comprises a partition wall disposed between the circulating fan and the cooking cavity, and the partition wall is provided with a plurality of circulating holes, wherein the circulating fan is configured such that the gas in the cooking cavity exits the cooking cavity through a part of the circulating holes and reenters the cooking cavity through another part of the circulating holes.

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