Microwave heating apparatus

Abstract

The application provides a microwave heating device, and relates to the technical field of household appliances.The microwave heating device comprises a first shell, a microwave source and a waveguide tube.The waveguide tube comprises a first waveguide part arranged on a first side wall of the first shell, and the first waveguide part is used for guiding the microwave to travel along a single straight line path.A slot antenna is arranged on the side of the first waveguide part close to the first shell and connected with the heating cavity, or an opening is arranged on the side of the first waveguide part close to the first shell, a first side wall cover is arranged on the opening, and the first side wall is provided with the slot antenna.The slot antenna comprises a plurality of first slots and a plurality of second slots, and the first slots are perpendicular to the second slots.The first slots and the second slots of the slot antenna cut the induced current to radiate electromagnetic waves with multiple phases and amplitudes, and the uniform field is formed by superposition, so that the food in the heating cavity is uniformly heated, the manufacturing cost is reduced, the manufacturing process is simplified, and the effective volume of the microwave heating device is increased.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a microwave heating device. Background Technology

[0002] In the process of researching and practicing existing technologies, the inventors of this application discovered that existing microwave heating equipment typically uses a stirring device to agitate microwaves to achieve a uniform microwave field within the cavity, or uses a rotating disk to ensure that the object to be heated placed on the disk is uniformly heated by the microwave field. The installation of a stirring device or rotating disk not only increases the manufacturing cost of the microwave heating equipment but also increases its manufacturing difficulty, and it also occupies space within the entire microwave heating equipment, reducing its effective volume ratio. Summary of the Invention

[0003] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a microwave heating device, the microwave heating device comprising:

[0004] A first housing, the first housing enclosing a heating cavity;

[0005] A microwave source is located outside the first housing and is used to generate microwaves.

[0006] A waveguide is disposed outside the first housing. The waveguide includes at least a first waveguide portion disposed on the first sidewall of the first housing. The first waveguide portion is connected to a microwave source and is used to guide microwaves to travel along a single straight path.

[0007] A slot antenna communicating with the heating cavity is provided on the side of the first waveguide near the first housing; or, an opening is provided on the side of the first waveguide near the first housing, a first sidewall is covered on the opening, and a slot antenna is provided on the first sidewall.

[0008] The slot antenna includes multiple first slots and multiple second slots, with the first slots perpendicular to the second slots.

[0009] The first gap extends along the first direction, and multiple first gaps are arranged in a matrix.

[0010] The second gap extends along the second direction and connects two adjacent first gaps. The first direction is perpendicular to the second direction.

[0011] The second gap is connected to the middle of the two adjacent first gaps.

[0012] The waveguide also includes a second waveguide section, which is connected to the microwave source and the first waveguide section respectively, and is used to transmit microwaves to the first waveguide section. The second waveguide section is disposed on the second side wall of the first housing, and the second side wall is disposed adjacent to the first side wall.

[0013] The first housing also includes a third sidewall disposed opposite to the first sidewall, and the microwave source is disposed on the side of the third sidewall away from the first sidewall.

[0014] The width of the second waveguide is smaller than the width of the first waveguide.

[0015] The microwave heating device also includes a second housing, which forms a receiving cavity. The first housing, the microwave source, and the waveguide are all housed within the receiving cavity. The first waveguide is disposed between the first sidewall and the sidewall of the second housing, the second waveguide is disposed between the second sidewall and the sidewall of the second housing, and the microwave source is disposed between the third sidewall and the sidewall of the second housing.

[0016] The microwave heating equipment also includes a separator, which is disposed inside the heating cavity to divide at least a portion of the heating cavity into multiple heating chambers.

[0017] The ratio of the area of ​​the slot antenna to the area of ​​the projection of the first waveguide onto the first sidewall is greater than or equal to 1 / 5.

[0018] The ratio of the area of ​​the projection of the first waveguide portion onto the first sidewall to the area of ​​the first sidewall is greater than or equal to 1 / 2.

[0019] The width of the first waveguide is an integer multiple of half the wavelength of the microwave.

[0020] The advantages of the microwave heating device provided in this application, which differ from existing technologies, are as follows:

[0021] Microwave heating equipment can guide microwaves along a single straight path through the first waveguide, so that the first and second slits of the slot antenna cut the induced current and radiate electromagnetic waves with multiple phase amplitudes into the heating cavity. These waves are then superimposed to form a uniform electromagnetic field, achieving uniform heating of food in the heating cavity. This eliminates the need for structural components such as stirring devices or turntables to disperse microwaves, reducing manufacturing costs, simplifying the manufacturing process, and increasing the effective volume of the microwave heating equipment. Attached Figure Description

[0022] Figure 1 This is a partial structural schematic diagram of a microwave heating device provided in some embodiments of this application;

[0023] Figure 2 yes Figure 1 A partial structural schematic diagram of the microwave heating device in the embodiment from a top-down perspective;

[0024] Figure 3 yes Figure 1 A partial structural schematic diagram of the microwave heating device in the embodiment from a side view;

[0025] Figure 4 This is a partial structural schematic diagram of a microwave heating device provided in other embodiments of this application;

[0026] Figure 5 This is a partial structural schematic diagram of a microwave heating device provided in other embodiments of this application;

[0027] Figure 6 yes Figure 5 A partial structural schematic diagram of the microwave heating device in the embodiment from a top-down perspective;

[0028] Figure 7 yes Figure 5 A partial structural schematic diagram of the microwave heating device in the embodiment;

[0029] Figure 8 This is a partial structural schematic diagram of a microwave heating device provided in other embodiments of this application from a top-down perspective;

[0030] Figure 9 This is a schematic diagram of the first detection effect of the microwave heating device provided in some embodiments of this application;

[0031] Figure 10 This is a schematic diagram of the second detection effect of the microwave heating device provided in some embodiments of this application;

[0032] Figure 11 This is a schematic diagram of the third detection effect of the microwave heating device provided in some embodiments of this application;

[0033] Figure 12 This is a schematic diagram of the fourth detection effect of the microwave heating device provided in some embodiments of this application. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] The terms “first,” “second,” etc., used herein may be used to describe multiple elements, components, regions, layers, and / or segments; however, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as “first,” “second,” and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] Please see Figure 1-8 This application provides structural schematic diagrams of some microwave heating devices.

[0039] The microwave heating device 10 provided in this application is a device that can use microwaves to heat materials, such as a microwave oven. This application addresses the shortcomings of existing microwave heating devices that require the installation of a stirring device or glass turntable and a corresponding stirring motor or turntable motor to achieve uniform microwave distribution.

[0040] Please see Figure 1 , Figure 1 This is a partial structural schematic diagram of a microwave heating device provided in some embodiments of this application.

[0041] In some embodiments, the microwave heating device 10 includes a first housing 100. The first housing 100 surrounds a heating cavity 101. The heating cavity 101 can be used to contain materials to be heated, such as food to be cooked. The microwave heating device 10 also includes a second housing 200. The second housing 200 surrounds a receiving cavity 201. The first housing 100 is housed within the receiving cavity 201.

[0042] The sidewall of the first housing 100 can form the inner wall of the microwave heating device 10, such as the cavity sidewall of a microwave oven. The sidewall of the second housing 200 can form the outer wall of the microwave heating device 10, such as the oven body sidewall of a microwave oven. The sidewall of a housing is defined as a wall on one side of the housing, and is not specifically limited to a wall in any particular direction. For example, the first housing 100 and the second housing 200 can be hexahedral in shape, and the sidewall of the housing can represent any one of the top wall, four side walls, and bottom wall of the hexahedron. A wall on the same side of the first housing 100 and the second housing 200 forms the door of the microwave heating device 10. This door can be made of a light-transmitting material such as glass.

[0043] In some embodiments, a certain distance is provided between the sidewall of the first housing 100 and the sidewall of the second housing 200 to avoid the risks that may be caused by microwave leakage and improve the safety of the microwave heating device 10.

[0044] Optionally, the distance between the sidewall of the first housing 100 and the sidewall of the second housing 200 is approximately 30 centimeters.

[0045] The space between the sidewall of the first housing 100 and the sidewall of the second housing 200 can be used to install other structures to improve the space utilization of the microwave heating device 10.

[0046] In some embodiments, the microwave heating device 10 further includes a microwave source 300 and a waveguide 400. Both the microwave source 300 and the waveguide 400 are disposed outside the first housing 100. The microwave source 300 may consist of a magnetron and a transformer, and is used to generate microwaves. The waveguide 400 is connected to the microwave source 300 and is used to transmit microwaves.

[0047] The microwave source 300 and the waveguide 400 can be respectively disposed outside two different side walls of the first housing 100 and accommodated in the space between the side walls of the first housing 100 and the side walls of the second housing 200, so that they do not have to occupy the space outside the second housing 200 and improve the effective volume ratio of the microwave heating device 10.

[0048] In addition, the microwave heating device 10 also has a slot antenna 500. The slot antenna 500 can be formed on the first housing 100. The slot antenna 500 is in communication with the heating cavity 101 and is used to radiate microwaves into the heating cavity 101 to heat the material.

[0049] In other embodiments, the slot antenna 500 may also be disposed on the waveguide 400, or on the first housing 100 and the waveguide 400.

[0050] Please refer to the following: Figure 1 and Figure 2 , Figure 2 yes Figure 1 A partial structural schematic diagram of the microwave heating device in the embodiment from a top-down perspective.

[0051] In some embodiments, the waveguide 400 includes a first waveguide portion 410. The first waveguide portion 410 is connected to the microwave source 300 and is used to guide microwaves along a single straight path. The first waveguide portion 410 is disposed on a first sidewall 110 of the first housing 100. The first sidewall 110 can be any sidewall of the first housing 100. The slot antenna 500 can be disposed on the first sidewall 110.

[0052] Optionally, the first sidewall 110 is rectangular. The first waveguide portion 410 is a rectangular waveguide. The first waveguide portion 410 is laid on the first sidewall 110.

[0053] Optionally, the distance between each edge of the first waveguide portion 410 and the edge of the first sidewall 110 is approximately 15-25 mm to form an area for mounting and fixing components, facilitating the fixing of the first waveguide portion 410 to the first sidewall 110. The first waveguide portion 410 can be fixed to the first sidewall 110 by welding or other processing methods.

[0054] In this embodiment, the distance between each edge of the first waveguide portion 410 and the edge of the first sidewall 110 is 20 mm.

[0055] Optionally, the ratio of the area of ​​the projection of the first waveguide portion 410 onto the first sidewall 110 to the area of ​​the first sidewall 110 is greater than or equal to 1 / 2, so as to ensure that the slot antenna 500 has sufficient installation space.

[0056] In this embodiment, the ratio of the area of ​​the projection of the first waveguide portion 410 onto the first sidewall 110 to the area of ​​the first sidewall 110 is greater than or equal to 6 / 10. In some embodiments, limited by the spacing between the edge of the first waveguide portion 410 and the edge of the first sidewall 110, the ratio of the area of ​​the projection of the first waveguide portion 410 onto the first sidewall 110 to the area of ​​the first sidewall 110 is less than or equal to 8 / 10.

[0057] Optionally, the width of the first waveguide 410 is an integer multiple of half the microwave wavelength to improve the microwave transmission efficiency in the first waveguide 410. Here, the microwave wavelength refers to the wavelength of the microwave transmitted in the first waveguide 410. For example, if the microwave wavelength is λ, the width of the first waveguide 410 can be λ / 2, λ, 3λ / 2, 2λ, etc. The microwave in the microwave heating device 10 is approximately 12 centimeters, for example, 122 millimeters.

[0058] Please refer to the following: Figures 1-3 , Figure 3 yes Figure 1 A partial structural schematic diagram of the microwave heating device in the embodiment from a side view.

[0059] In some embodiments, the waveguide 400 further includes a second waveguide section 420. The second waveguide section 420 is connected to the microwave source 300 and the first waveguide section 410 respectively, and is used to transmit the microwaves generated by the microwave source 300 to the first waveguide section 410.

[0060] Optionally, the first waveguide 410 and the second waveguide 420 may be made of a non-ferromagnetic material with high conductivity to reduce microwave attenuation in the first waveguide 410 and the second waveguide 420.

[0061] The second waveguide portion 420 is disposed on the second sidewall 120 of the first housing 100. The second sidewall 120 is disposed adjacent to the first sidewall 110. In other words, the space of the first sidewall 110 can be used entirely for installing the first waveguide portion 410, thereby increasing the area occupied by the first waveguide portion 410 on the first sidewall 110.

[0062] Optionally, the width of the second waveguide 420 is also an integer multiple of 1 / 2 of the microwave wavelength, i.e., an integer multiple of λ / 2, in order to improve the microwave transmission efficiency in the second waveguide 420.

[0063] In some embodiments, the first housing 100 further includes a third sidewall 130 disposed opposite to the first sidewall 110. The microwave source 300 is disposed on the side of the third sidewall 130 away from the first sidewall 110.

[0064] The first waveguide 410 is disposed between the first sidewall 110 and the sidewall of the second housing 200, the second waveguide 420 is disposed between the second sidewall 120 and the sidewall of the second housing 200, and the microwave source 300 is disposed between the third sidewall 130 and the sidewall of the second housing 200, so as to improve the effective volume ratio of the microwave heating device 10.

[0065] Of course, in other embodiments, the arrangement of the first waveguide 410, the second waveguide 420, and the microwave source 300 is not limited to this embodiment. For example, the second waveguide 420 and the microwave source 300 can be simultaneously installed between the second sidewall 120 and the sidewall of the second housing 200. Alternatively, the first waveguide 410 and the second waveguide 420 can be simultaneously installed between the first sidewall 110 and the sidewall of the second housing 200.

[0066] Optionally, the width of the second waveguide portion 420 is smaller than the width of the first waveguide portion 410, so as to reduce the space occupied by the second waveguide portion 420 in the microwave heating device 10 and save the manufacturing cost of the microwave heating device 10.

[0067] In this embodiment, the second waveguide portion 420 is connected to the middle portion of the first waveguide portion 410. In other embodiments, the second waveguide portion 420 may also be connected to the end of the first waveguide portion 410 closer to the side wall of the second housing 200, thereby forming a larger space between the second side wall 120 and the side wall of the second housing 200 to facilitate the installation of other structures.

[0068] In some embodiments, the width of the first waveguide portion 410 is greater than or equal to 175 mm and less than or equal to 185 mm, and the depth is greater than or equal to 10 mm and less than or equal to 20 mm. The width of the second waveguide portion 420 is greater than or equal to 80 mm and less than or equal to 85 mm, and the depth is greater than or equal to 10 mm and less than or equal to 20 mm. After microwaves are transmitted from the second waveguide portion 420 to the first waveguide portion 410, the microwaves can diffuse within the region of the first waveguide portion 410.

[0069] In this embodiment, the first waveguide portion 410 has a width of 180 mm and a depth of 15 mm. The second waveguide portion 420 has a width of 83 mm and a depth of 15 mm.

[0070] Figure 4 This is a partial structural schematic diagram of a microwave heating device provided in other embodiments of this application.

[0071] In some embodiments, the waveguide 400 is a complete tubular structure. A first waveguide portion 410 is disposed near the tube wall of the first housing 100 and attached to the first side wall 110. A second waveguide portion 420 is disposed near the tube wall of the first housing 100 and attached to the second side wall 120. Microwaves generated by the microwave source 300 can be transmitted through the tube wall of the second waveguide portion 420 to the tube wall of the first waveguide portion 410. A slot antenna 500 communicating with the heating cavity 101 is provided on the side of the first waveguide portion 410 near the first housing 100. That is, the slot antenna 500 is provided on the tube wall of the first waveguide portion 410 near the first housing 100, and the first side wall 110 also has a corresponding slot opening communicating with the heating cavity 101, the shape of which matches the slot antenna 500. Microwaves can be transmitted along the tube wall of the waveguide 400 and fed into the heating cavity 101 through the slot antenna 500 for coupling.

[0072] Specifically, the second waveguide 420 extends from one end of the second sidewall 120 near the third sidewall 130 to the other end of the second sidewall 120 near the first sidewall 110. Microwaves transmitted from the microwave source 300 to the second waveguide 420 can travel along a single straight path along the extension direction of the second waveguide 420 to the first waveguide 410, and then travel along another single straight path along the extension direction of the first waveguide 410 on the first sidewall 110. When microwaves are transmitted within the waveguide 400, a high-frequency alternating current is induced on the wall of the waveguide 400. The slot antenna 500 can interrupt the current on the surface of the first waveguide 410 and generate a displacement current, which excites the slot antenna 500, converting the energy in the first waveguide 410 into electromagnetic waves that are radiated towards the heating cavity 101 to heat the material inside the heating cavity 101.

[0073] Optionally, the waveguide 400 can be fixed to the first housing 100 with the corresponding slot opening after being cut to form the slot antenna 500, or it can be integrally cut to form the slot antenna 500 and the corresponding slot opening after being fixed to the first housing 100. The slot opening on the first housing 100 can be exactly the same as the shape of the slot antenna 500, or it can be slightly deviated, or its position can be slightly offset.

[0074] In some embodiments, the microwave heating device 10 further includes a separator 600. The separator 600 is disposed within the heating cavity 101 and is used to divide at least a portion of the heating cavity 101 to form a plurality of heating chambers 601.

[0075] The separator 600 may include multiple partitions that can be interconnected to enclose multiple isolated heating chambers 601 within the heating cavity 101. This allows for the simultaneous heating of multiple materials while preventing them from interfering with each other. For example, the multiple heating chambers 601 can hold various foods to be cooked, enabling the microwave heating device 10 to heat multiple foods simultaneously and preventing food molecules from diffusing onto other foods during heating, thus avoiding cross-contamination and other problems. The separator 600 can divide part of the heating cavity 101 into multiple heating chambers 601, or it can divide the entire heating cavity 101 into multiple heating chambers 601.

[0076] In this embodiment, the partition 600 can enclose and form multiple grooves with rectangular cross-sections. These grooves can be interconnected to fully utilize the space of the heating chamber 101 for arranging the heating chambers 601. The partition 600 may also include a cover plate that can be applied to the grooves to facilitate the sealing of each heating chamber 601. The partition 600 is made of a microwave-transparent material, such as high-temperature resistant glass, to allow the user to observe the heating of the material within the heating chamber 601.

[0077] In other embodiments, the shape of the groove formed by the partition 600 is not limited to this embodiment, and can be designed into other shapes according to actual needs, without specific limitations.

[0078] Please see Figure 5 , Figure 5 This is a partial structural schematic diagram of a microwave heating device provided in other embodiments of this application.

[0079] In some embodiments, the waveguide 400 may also be a non-complete tubular structure. Specifically, the wall of the waveguide 400 includes only the top wall facing away from the first housing 100 and the side wall connecting the top wall and the first housing 100. That is, the waveguide 400 has an opening 401 on the side near the first housing 100, and the side wall of the first housing 100 covers the opening 401, so that a portion of the side wall of the first housing 100 can constitute a portion of the wall of the waveguide 400.

[0080] Optionally, the waveguide 400 with the opening 401 can be covered on the first side wall 110 and the second side wall 120 of the first housing 100 and fixed to the first housing 100 to form the first waveguide portion 410 and the second waveguide portion 420.

[0081] A slot antenna 500 is provided on the first sidewall 110. The slot antenna 500 is provided on the area of ​​the first sidewall 110 that covers the opening 401, that is, on the portion of the first sidewall 110 that constitutes the bottom wall of the first waveguide portion 410. The slot antenna 500 may include various slots, such as a first slot 510 and a second slot 520 that are perpendicular to each other.

[0082] Please refer to the following: Figures 5 to 7 , Figure 6 yes Figure 5 A partial structural schematic diagram of the microwave heating device in the embodiment from a top-down view. Figure 7 yes Figure 5 A partial structural schematic diagram of the microwave heating device in the embodiment.

[0083] In this embodiment, the slot antenna 500 is directly formed on the first sidewall 110. The first sidewall 110 on which the slot antenna 500 is formed can cover the opening 401 of the first waveguide portion 410. A portion of the first sidewall 110 that forms the first waveguide portion 410 can protrude from other portions of the first sidewall 110, so that the first waveguide portion 410 can be engaged with the first sidewall 110 to achieve positioning.

[0084] In the microwave heating device 10, microwaves transmitted to the second waveguide section 420 can travel on the tube wall of the second waveguide section 420 and on a portion of the second sidewall 120 covering the second waveguide section 420 to the first waveguide section 410, and then on the tube wall of the first waveguide section 410 and on a portion of the first sidewall 110 covering the first waveguide section 410. By using a portion of the first sidewall 110 and a portion of the second sidewall 120 as the tube walls of the first waveguide section 410 and the second waveguide section 420 respectively, the installation space required for the waveguide 400 can be reduced, saving the manufacturing cost of the waveguide 400. In addition, the slot antenna 500 can be directly formed on the first sidewall 110, thereby reducing the processing difficulty.

[0085] The portion of the second waveguide 420 extending beyond the second sidewall 120 retains a complete tube wall structure and is connected to the microwave source 300. The microwave source 300 includes a microwave antenna 310. The microwave antenna 310 is inserted into the portion of the second waveguide 420 extending beyond the second sidewall 120 to transmit microwaves to the second waveguide 420. The portion of the second waveguide 420 extending beyond the second sidewall 120 can be attached to the third sidewall 130.

[0086] In other embodiments of this application, the second waveguide portion 420 disposed on the second sidewall 120 may also have a complete tube wall structure, either partially or entirely.

[0087] Please see Figure 8 , Figure 8This is a partial structural schematic diagram of a microwave heating device provided in other embodiments of this application from a top-down perspective.

[0088] In some embodiments, the slot antenna 500 includes a first slot 510 and a second slot 520. The first slot 510 extends along a first direction, and the second slot 520 extends along a second direction. The first direction is the X-axis direction, and the second direction is the Y-axis direction. The X-axis and Y-axis are perpendicular to each other. The first slot 510 and the second slot 520 are perpendicular to each other.

[0089] In the microwave heating device 10, the slot antenna 500 only generates radiation when the current is interrupted, and the amplitude and phase of the interrupted current vary depending on the position of the slot antenna 500. In this embodiment, by creating a first slot 510 and a second slot 520 perpendicular to each other on the first waveguide portion 410 or the first sidewall 110, the slot antenna 500 can generate waves with multiple phase amplitudes, which are then superimposed to form a uniform field, achieving uniform heating of the material within the heating cavity 101. This uniform field can be a uniform electric field, a uniform magnetic field, or a uniform electromagnetic field. A changing electric field generates a magnetic field, and a changing magnetic field generates an electric field; the interaction between the electric and magnetic fields is inseparable, forming an electromagnetic field.

[0090] Wherein, the first slit 510 extends in the first direction at a length greater than or equal to λ / 5 and less than or equal to λ / 3. The second slit 520 extends in the second direction at a length greater than or equal to λ / 5 and less than or equal to λ / 3. λ is the wavelength of the microwave.

[0091] In this embodiment, the first slit 510 extends for a length of λ / 4 in the first direction. The second slit 520 extends for a length of λ / 4 in the second direction to improve the uniformity of the uniform field formed in the heating cavity 101.

[0092] Optionally, the slot antenna 500 includes a plurality of first slots 510 and a plurality of second slots 520.

[0093] The plurality of first slits 510 are arranged in a matrix interval. The plurality of second slits 520 are also arranged in a matrix interval. The slit array consisting of the plurality of first slits 510 and the plurality of second slits 520 arranged in a matrix interval is distributed on the first sidewall 110 or on the surface of the first waveguide portion 410 near the first sidewall 110.

[0094] The first waveguide 410 guides microwaves along a single straight path. The first slit 510 and the second slit 520 are formed on the surface of the first waveguide 410 or attached to the first sidewall 110 of the first waveguide 410. This allows the microwave heating device 10 to maximize the use of the space of the first sidewall 110 to increase the number of first slits 510 and second slits 520. This maximizes the uniformity of the uniform field formed by the superposition of multiple phase waves generated by the slit antenna 500 composed of multiple first slits 510 and multiple second slits 520, thereby improving the uniformity of the heating of the material in the heating cavity 101.

[0095] Optionally, the spacing between the first slits 510 in the first direction is greater than or equal to λ / 4 and less than or equal to 3λ / 4 to improve the uniformity of the uniform field formed within the heating cavity 101. This spacing is defined as the distance between the centers of two adjacent first slits 510.

[0096] Optionally, the distance between the first slit 510 and / or the second slit 520 located at the edge of the first waveguide section 410 or the edge of the portion of the first sidewall 110 covering the opening 401 and the edge of the first sidewall 110 is greater than or equal to λ / 5 and less than or equal to λ / 3, so as to improve the uniformity of the uniform field formed in the heating cavity 101.

[0097] Optionally, the ratio of the area of ​​the slot antenna 500 to the area of ​​the projection of the first waveguide portion 410 onto the first sidewall 110 is greater than or equal to 1 / 5, so as to improve the uniformity of the uniform field formed in the heating cavity 101.

[0098] In this embodiment, the ratio of the area of ​​the slot antenna 500 to the area of ​​the projection of the first waveguide portion 410 onto the first sidewall 110 is at least 2 / 5. In some embodiments, this area ratio is also no greater than 3 / 5.

[0099] In this embodiment, the spacing between the first slots 510 in the first direction is λ / 2. The distance between the outermost first slot 510 and / or the second slot 520 on the first waveguide portion 410 or the first sidewall 110 where the slot antenna 500 is located and the edge of the first sidewall 110 is λ / 4.

[0100] Optionally, the second slot 520 connects two adjacent first slots 510 to improve the utilization rate of the installation space of the first waveguide portion 410 or the first sidewall 110 where the slot antenna 500 is located, that is, to increase the number of slot antennas 500.

[0101] The second slot 520 is connected to the middle of the two adjacent first slots 510 to improve the uniformity of the uniform field formed in the heating cavity 101. That is to say, the slot antenna 500 is a plurality of I-shaped gaps composed of a plurality of first slots 510 and a plurality of second slots 520.

[0102] Optionally, the first slot 510 extends along the direction in which microwaves travel on the first waveguide 410, and the second slot 520 extends perpendicular to this direction, so as to increase the number of slot antennas 500 on the rectangular plane.

[0103] In other embodiments, the first slot 510 may extend in other directions, and the second slot 520 may always be perpendicular to the first slot 510. For example, when the slot antenna 500 is arranged on a curved plane, the perpendicular first slot 510 and the second slot 520 may be arranged to correspond to the curvature of the curved surface in order to maximize the number of slot antennas 500.

[0104] In this embodiment, the microwave heating device 10 can generate waves with multiple phase amplitudes fed into the heating cavity 101 through a large number of first gaps 510 and second gaps 520 opened in a specific manner, and these waves are superimposed to form a uniform field, thereby achieving a uniform heating effect on the material in the heating cavity 101 without the need for a stirring structure or a rotating structure. This improves the effective volume ratio of the microwave heating device 10, simplifies the manufacturing process of the microwave heating device 10, and reduces the manufacturing cost of the microwave heating device 10.

[0105] Please see Figure 9 , Figure 9 This is a schematic diagram of the first detection effect of a microwave heating device provided in some embodiments of this application.

[0106] According to the field distribution test, the field distribution effect that the microwave heating device 10 provided in this embodiment can achieve is: maximum field strength / minimum field strength: 124 / 3.15 = 39.3.

[0107] Please see Figure 10 , Figure 10 This is a schematic diagram of the second detection effect of a microwave heating device provided in some embodiments of this application.

[0108] According to water load simulation testing, the microwave heating device 10 provided in this application embodiment can achieve the following temperature uniformity effect: temperature difference is less than 5 degrees Celsius.

[0109] Please see Figure 11 , Figure 11 This is a schematic diagram of the third detection effect of a microwave heating device provided in some embodiments of this application.

[0110] According to water load thermal imaging, the microwave heating device 10 provided in this application embodiment can achieve a temperature uniformity effect of less than 5 degrees Celsius.

[0111] Please see Figure 12 , Figure 12 This is a schematic diagram of the fourth detection effect of the microwave heating device provided in some embodiments of this application.

[0112] According to the IEC 1000mL beaker cold matching test, the matching performance of the microwave heating device 10 provided in this application embodiment is: VSWR < 2. Therefore, the matching performance of the microwave heating device 10 provided in this application embodiment is good.

[0113] It should be noted that the terms "horizontal" and "vertical" do not imply that the components must be absolutely horizontal or vertical, but rather that they can be slightly tilted. Similarly, the terms "parallel" and "perpendicular" do not imply that the components are absolutely parallel or perpendicular, but rather that they can have a certain angular deviation. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted. Furthermore, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of this application is in use. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0114] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0115] The fixed connection mentioned in the embodiments of this application can be one or more of the following connection methods: riveting, welding, bonding, bolting, keying, snap-fitting, magnetic adsorption, etc., or it can be integrally formed. For those skilled in the art, they can determine which connection method to adopt based on the specific circumstances.

[0116] It is understood that the term "multiple" in this document means at least two, such as two, three, etc., unless otherwise specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0117] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A microwave heating device, characterized in that, The microwave heating device includes: A first housing, the first housing enclosing a heating cavity; A microwave source is disposed outside the first housing, and the microwave source is used to generate microwaves; A waveguide is disposed outside the first housing. The waveguide includes at least a first waveguide portion disposed on a first sidewall of the first housing. The first waveguide portion is connected to the microwave source and is used to guide the microwaves to travel along a single straight path. A slot antenna communicating with the heating cavity is provided on the side of the first waveguide near the first housing; or, an opening is provided on the side of the first waveguide near the first housing, the first sidewall covers the opening, and the slot antenna is provided on the first sidewall. The slot antenna includes a plurality of first slots and a plurality of second slots; the first slots extend along a first direction, which is the direction in which microwaves travel on the first waveguide; the extension length of the first slot in the first direction is 1 / 5 to 1 / 3 of the wavelength of the microwaves; the spacing between the first slots in the first direction is greater than or equal to 1 / 4 of the wavelength of the microwaves and less than or equal to 3 / 4 of the wavelength of the microwaves, so as to improve the uniformity of the uniform field formed in the heating cavity. The second slit extends along a second direction, which is perpendicular to the first direction. The extension length of the second slit in the second direction is 1 / 5 to 1 / 3 of the wavelength of the microwave. The second slit connects two adjacent first slits. The first slit is perpendicular to the second slit, such that the slit antenna cuts the induced current at different positions through the first slit and the second slit to radiate electromagnetic waves with multiple phase amplitudes into the heating cavity.

2. The microwave heating device according to claim 1, characterized in that, The multiple first gaps are arranged in a matrix.

3. The microwave heating device according to claim 2, characterized in that, The second gap is connected to the middle of the two adjacent first gaps.

4. The microwave heating device according to claim 2, characterized in that, The plurality of second slits are also arranged in a matrix; wherein, the slit array consisting of the plurality of first slits and the plurality of second slits arranged in a matrix is ​​distributed on the first sidewall or on the surface of the first waveguide portion near the first sidewall.

5. The microwave heating device according to claim 4, characterized in that, A plurality of first slits and a plurality of second slits are disposed in the first waveguide portion. The distance between the first slit and / or the second slit located at the edge of the first waveguide portion and the edge of the first sidewall is greater than or equal to 1 / 5 of the wavelength of the microwave and less than or equal to 1 / 3 of the wavelength of the microwave, so as to improve the uniformity of the uniform field formed in the heating cavity. or A plurality of first slits and a plurality of second slits are disposed on the first sidewall. The distance between the first slits and / or the second slits located at the edge of the portion of the first sidewall covering the opening and the edge of the first sidewall is greater than or equal to 1 / 5 of the wavelength of the microwave and less than or equal to 1 / 3 of the wavelength of the microwave, so as to improve the uniformity of the uniform field formed in the heating cavity.

6. The microwave heating device according to claim 1, characterized in that, The waveguide also includes a second waveguide section, which is connected to the microwave source and the first waveguide section respectively, for transmitting the microwave to the first waveguide section. The second waveguide section is disposed on the second side wall of the first housing, and the second side wall is disposed adjacent to the first side wall.

7. The microwave heating device according to claim 6, characterized in that, The first housing also includes a third sidewall disposed opposite to the first sidewall, and the microwave source is disposed on the side of the third sidewall away from the first sidewall.

8. The microwave heating device according to claim 6, characterized in that, The width of the second waveguide is smaller than the width of the first waveguide.

9. The microwave heating device according to claim 7, characterized in that, The microwave heating device further includes a second housing, which encloses a receiving cavity. The first housing, the microwave source, and the waveguide are all housed within the receiving cavity. The first waveguide is disposed between the first sidewall and the sidewall of the second housing, the second waveguide is disposed between the second sidewall and the sidewall of the second housing, and the microwave source is disposed between the third sidewall and the sidewall of the second housing.

10. The microwave heating device according to claim 1, characterized in that, The microwave heating device further includes a separator disposed within the heating cavity, which is used to divide at least a portion of the heating cavity into multiple heating chambers.

11. The microwave heating apparatus according to any one of claims 1-10, characterized in that, The ratio of the area of ​​the slot antenna to the area of ​​the projection of the first waveguide portion onto the first sidewall is greater than or equal to 1 / 5.

12. The microwave heating apparatus according to any one of claims 1-10, characterized in that, The ratio of the area of ​​the projection of the first waveguide portion onto the first sidewall to the area of ​​the first sidewall is greater than or equal to 1 / 2.

13. The microwave heating apparatus according to any one of claims 1-10, characterized in that, The width of the first waveguide is an integer multiple of 1 / 2 of the wavelength of the microwave.

Images