A microwave processing box and microwave working method

Abstract

The present invention discloses a microwave processing box and a microwave working mode, comprising a processing cavity, wherein N feed ports are provided on at least one of the sides surrounding the processing cavity, wherein the feed ports are used to connect a microwave source to feed microwaves into the processing cavity, wherein the angle between the electric field direction at the geometric center of the cross section of at least one of the feed ports and the horizontal plane is an acute angle or an obtuse angle, and N is a natural number greater than or equal to 2. The present invention realizes good isolation between adjacent feed ports.

Description

Technical Field

[0001] The invention relates to the field of microwaves, and in particular to a microwave processing box and a microwave working method. Background Art

[0002] The microwave processing box uses microwaves to process the materials in the box, including but not limited to heating, thawing, drying, sterilization, sintering, etc. The invention and widespread use of household microwave ovens have promoted the research, development and production of microwave processing boxes for industrial and agricultural production purposes. An ordinary microwave processing box includes a large-sized, highly overmolded processing chamber, a plurality of feed ports located on one or more surfaces of the processing chamber, one or more pallets located in the processing chamber, and the processed materials located on or in the pallets. A shelf is provided in the processing chamber, and the pallet is placed on the shelf. For uniformity of processing, the shelf can be rotated around a certain axis. A microwave source is connected to each feed port and sends microwaves into the processing chamber through the feed port.

[0003] Since multiple feed ports are coupled to each other, one of the main problems of this technical solution is that the microwave source and the processing cavity cannot be matched through the adapter, because the change of any feed port will change the load of other microwave sources, resulting in mismatch of other microwave sources. As a result, the microwave source is often in a mismatched state, and the microwave fed into the processing cavity is reflected, resulting in reduced energy efficiency and reflected microwaves returning to the microwave source, which seriously reduces the service life of the microwave source.

[0004] The existing feed port is a rectangular feed port, and the long side of the rectangular feed port is often set in the horizontal direction. Generally, the solid material on the pallet or the liquid material in the pallet is in the form of a thin sheet, and the normal line of the thin sheet is in the vertical direction. When the long side of the rectangular feed port is set in the horizontal direction, the interaction between the microwave and the material is relatively weak, and the microwave will pass through the material to the other side of the processing chamber, and after reflection, it will form a standing wave in the processing chamber, resulting in serious unevenness in material processing.

[0005] The above background technology is for facilitating the understanding of the present invention and is not the known technology disclosed to the general public before the application of the present invention. Summary of the invention

[0006] In view of the above-mentioned defects, the present invention provides a microwave processing box, which aims to improve at least one problem mentioned in the background technology.

[0007] The technical solution is: a microwave processing box, including a processing cavity, at least one of the sides surrounding the processing cavity is provided with N feed ports, the feed ports are used to connect a microwave source to feed microwaves into the processing cavity, the angle between the electric field direction at the geometric center of the cross section of at least one of the feed ports and the horizontal plane is an acute angle or an obtuse angle, and N is a natural number greater than or equal to 2.

[0008] The cross section of the feed port can be any shape, such as circular, elliptical, polygonal, ridge waveguide, double-ridge waveguide, etc. In a preferred design, the cross section of the feed port is rectangular, and the electric field direction at its geometric center is perpendicular to its long side.

[0009] Furthermore, the angle between the electric field direction at the geometric center of the feed port and the horizontal plane is 30° to 60° or 120° to 150°.

[0010] Further, the processing chamber is a column or cone with a quadrilateral cross section with an axis in a vertical direction, and the side with the feed port is one, two or three of the side A, side B and side C. During operation, the feed ports of side A, side B and side C are divided into at least two groups, and the feed ports on the two groups work alternately. We can choose to set a matcher between each feed port of one or more groups of feed ports and the processing chamber.

[0011] Furthermore, the angle between the electric field direction at the geometric center of the feed port and the horizontal plane is 40° to 50° or 130° to 140°.

[0012] Furthermore, among the N feed ports on each side, each feed port has at least one feed port adjacent to it in the horizontal direction or the vertical direction, and the angle between the electric field directions at the geometric centers of the adjacent feed ports is 80-100°.

[0013] Furthermore, the side A and the side C are opposite surfaces, and among the feed ports of the side A, the vertical projection of the center point of at least one feed port on the side C coincides with the center point of a feed port on the side C, and the angle between the electric field directions at the geometric centers of the two feed ports is 80 to 100°.

[0014] Furthermore, at least one cargo tray for placing materials is provided in the processing chamber, and the cargo tray is a plate-like structure, and the distance between the upper surface of the cargo tray and the center point of at least one feeding port is less than 0.2 times or 0.4 times the side length of the feeding port.

[0015] Furthermore, at least one cargo tray for placing materials is provided in the processing chamber, and the cargo tray includes a bottom and a side surface, which form a cylindrical hollow part or a conical hollow part, and the vertical distance between the center point of the height of the cylindrical hollow part or the conical hollow part and the center point of at least one feed port is less than 0.4 times the length of the long side of the feed port.

[0016] Furthermore, the cargo pallet includes a bottom and sides, which form a cylindrical hollow part or a conical hollow part, and the vertical distance between the height center point of the cylindrical hollow part or the conical hollow part and the center point of at least one feeding port is less than 0.2 times the length of the long side of the rectangular feeding port.

[0017] The invention also provides a microwave working mode.

[0018] The technical solution is: a microwave working mode, using the above-mentioned microwave processing box, including:

[0019] The feed ports on the side of the processing chamber are set as rectangular feed ports, and the microwave polarization directions of any rectangular feed port on one side are perpendicular to the adjacent rectangular feed port, and the microwave polarization directions of the corresponding rectangular feed ports on the opposite sides are perpendicular to each other, so as to achieve good isolation between the feed ports, and make the electric field direction at the geometric center of each rectangular feed port form an angle of 45 degrees with the horizontal direction to enhance the interaction between microwaves and materials; different feed ports on different sides work alternately, and a distributor is added between the feed port that works later and the processing chamber to improve the heating efficiency and protect the microwave source.

[0020] Compared with the prior art, the inventive principle and beneficial effects of the present invention are:

[0021] The present invention makes the electric field direction at the geometric center of the rectangular feed port form an angle of 45 degrees with the horizontal direction, and at the same time makes the angle between the electric field directions at the geometric centers of the adjacent or opposite rectangular feed ports in the vertical direction or the horizontal direction all 90 degrees, thereby achieving good isolation between adjacent rectangular feed ports on the basis of strengthening the interaction between microwaves and materials. At the same time, all feed ports are arranged on different sides and the feed ports on different sides are allowed to work alternately. When the material absorbs microwaves well, such as when the moisture content of the material is relatively high, the first part of the feed ports arranged on some sides are allowed to work. Since the matching of these feed ports is relatively good at this time, a larger power can be fed through these feed ports to save processing time without causing a larger reflection. When the material absorbs poorly, such as when the moisture content in the material is relatively low, the microwave power fed through the first part of the feed ports can be appropriately reduced. When the material absorbs worse, such as when the moisture content in the material is lower, the second part of the feed ports arranged on other sides are allowed to work. At this time, the microwave power through the second part of the feed ports can be appropriately reduced to prevent the material from being burned due to uneven heating. At the same time, the adapter provided between each feed in the second part of the feed and the microwave source can improve the matching to enhance the energy efficiency.

[0022] The present invention allows all feed ports to be set to any shape, but preferably rectangular, in order to make the electric field directions at the centers of adjacent feed ports and relative feed ports perpendicular to each other. The feed ports are arranged on the side of the processing chamber, and the angle between the electric field direction at the geometric center of the rectangular feed port and the horizontal direction is 45 degrees, so that microwaves can effectively penetrate the material. By making the angle between the electric field directions at the geometric centers of adjacent or relative rectangular feed ports 90 degrees, the coupling between the feed ports is effectively reduced. By grouping all feed ports and working in sequence, and providing a dispenser between one or several groups of feed ports and the microwave source, the material can be prevented from being overburned and the energy utilization efficiency can be improved according to the changes in the microwave absorption of the material during the processing. The present invention can be used for microwave processing of various substances, including but not limited to drying, puffing, extraction, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the distribution of feed ports on one side of the present invention;

[0025] Figure 3 It is a schematic diagram of a feed port of the present invention;

[0026] Figure 4 is another feed port schematic diagram of the present invention;

[0027] In the figure, 1-processing chamber, 2-feed port, 3-tray, 4-material. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0031] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] The term "feed port" in the specification of this application and the above drawings refers to a hole leading to the processing chamber, generally a section of a cylindrical or hollow cone-shaped metal body. The cross section of the feed port refers to a plane figure obtained by tangent to a plane perpendicular to the feed port and its axis.

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0035] In the present invention, the pallet can be any container for placing materials. According to the needs, the pallet is preferably in a plate shape and a barrel shape with a height less than the diameter, but can also be other shapes.

[0036] Please refer to Figure 1-Figure 2 , Figure 1It is a schematic diagram of the overall structure of the present invention, Figure 2 This is a schematic diagram of the side feed distribution.

[0037] A microwave processing box comprises a processing chamber 1, which is rectangular and is surrounded by side A, side B, side C and side D. At least one cargo tray 3 for placing materials 4 is arranged in the processing chamber 1.

[0038] In one or more specific embodiments of the present invention, six feed ports 2 are provided on at least one of the side surfaces A, B, and C.

[0039] In another one or more specific embodiments of the present invention, six feed ports 2 are respectively provided on each of the side surfaces A, B, and C. At this time, when the material has good microwave absorption, such as when the moisture content of the material is relatively high, the first part of the feed ports arranged on some side surfaces are operated. Since the matching of these feed ports is relatively good at this time, a larger power can be fed through these feed ports to save processing time without causing a large reflection. When the material has poor absorption, such as when the moisture content in the material is relatively low, the microwave power fed through the first part of the feed ports can be appropriately reduced. When the material has even worse absorption, such as when the moisture content in the material is even lower, the second part of the feed ports arranged on other side surfaces are operated. At this time, the microwave power passing through the second part of the feed ports can be appropriately reduced to prevent the material from being burned due to uneven heating.

[0040] In the present invention, the feed port 2 is used to connect to a microwave source to feed microwaves into the processing chamber 1 .

[0041] Those skilled in the art should understand that the shape of the processing chamber 1 can be a column with its axis along the vertical direction, or a cone with its axis along the vertical direction, which is not particularly limited here, and those skilled in the art can make a selection as needed.

[0042] Those skilled in the art should also understand that the shape of the horizontal cross section of the processing chamber 1 is a polygon, which may be a triangle, a quadrilateral, or a pentagon, and is not particularly limited here, and those skilled in the art may select as needed.

[0043] In one or more specific embodiments of the present invention, in order to allow microwaves to effectively penetrate the material, the angle between the long side of the feed port 2 and the horizontal plane is an acute angle or an obtuse angle, so the feed port 2 is an inclined feed port 2. The electric field direction at the geometric center of the feed port 2 is perpendicular to the long side of the feed port 2, and the angle between the electric field and the horizontal plane is an acute angle or an obtuse angle.

[0044] In one or more specific embodiments of the present invention, in order to allow microwaves to penetrate materials more effectively, at this time, the angle between the electric field direction at the geometric center of the feed port 2 and the horizontal plane is 30° to 60° or 120° to 150°.

[0045] In one or more specific embodiments of the present invention, in order to allow microwaves to penetrate materials most effectively, at this time, the angle between the electric field direction at the geometric center of the feed port 2 and the horizontal plane is 45°.

[0046] In one or more specific embodiments of the present invention, in the same side feed port 2, each feed port 2 has at least one adjacent feed port 2 in the horizontal direction or the vertical direction, and the angle between the electric field directions at the geometric centers of adjacent feed ports 2 is 60 to 120°, which can effectively reduce the coupling between adjacent feed ports 2.

[0047] In one or more specific embodiments of the present invention, in the same side feed port 2 , when the angle between the electric field directions at the geometric centers of adjacent feed ports 2 is 90°, the coupling between adjacent feed ports 2 can be most effectively reduced.

[0048] In one or more specific embodiments of the present invention, the feed ports 2 on any of the side A, the side B or the side C are arranged in rows and columns, and the angle between the electric field directions at the geometric centers of adjacent rows of feed ports 2 is 90°, and the angle between the electric field directions at the geometric centers of adjacent columns of feed ports 2 is 90°. In this case, the best isolation effect can be obtained.

[0049] In one or more specific embodiments of the present invention, in the side surfaces A and C of the opposite surfaces, the projection of the center point of at least one of the feed ports 2 on the side A coincides with the center point of a feed port 2 on the side C, and the angle between the electric field directions at the geometric centers of the two feed ports 2 is 60 to 120°, so as to achieve better isolation.

[0050] In one or more specific embodiments of the present invention, the angle between the electric field directions at the geometric centers of the two feed ports 2 is 90°, in which case better isolation is achieved.

[0051] In one or more specific embodiments of the present invention, the cargo pallet 3 is a plate-like structure, and the distance between its upper surface and the center point of at least one feeding port 2 is less than 0.1 times, 0.2 times or 0.4 times the length of the smallest long side of the feeding port 2.

[0052] In one or more other specific embodiments of the present invention, the cargo tray 3 is a plate-like structure, and its upper surface is flush with the center point of at least one feeding port 2 in the horizontal direction.

[0053] In one or more specific embodiments of the present invention, the cargo tray 3 includes a tray bottom and a side surface, which enclose a columnar hollow portion or a conical hollow portion, and the vertical distance between the center point of the height of the columnar hollow portion or the conical hollow portion and the center point of at least one feed port 2 is less than 0.2 times or 0.4 times the length of the smallest long side of the rectangular feed port 2, and the center point of the height of the columnar hollow portion or the conical hollow portion is flush with the center point of at least one feed port 2 in the vertical direction. In this case, a better heating effect can be obtained.

[0054] In one or more specific embodiments of the present invention, a shelf is further provided in the processing chamber 1, and the pallets 3 are placed on the shelf in layers. The material of the shelf is preferably a wave-transmitting dielectric material that absorbs microwaves weakly.

[0055] In one or more further embodiments of the present invention, the rack may be rotated about a vertical axis for processing uniformity.

[0056] In one or more other specific embodiments of the present invention, a mixer is provided between at least one feed port on the side B and the microwave source.

[0057] Please refer to Figure 3-Figure 4 , Figure 3 A total of 3 rectangular feed ports 2 are shown in a row along the vertical direction. Figure 4 A total of four rectangular feed ports 2 are shown in a row along the vertical direction.

[0058] In the present invention, the rectangle in the rectangular feed port 2 may be a rectangle in a geometric sense, or a rectangle with a chamfered angle between a long side and a wide side, or a rectangle with an arc-shaped long side.

[0059] During operation, solid materials or liquid materials can be spread on the bottom of the pallet 3 or in the pallet 3 .

[0060] The present invention also provides a microwave working mode, which adopts the microwave processing box mentioned above.

[0061] A microwave working mode, using the above-mentioned microwave processing box, includes:

[0062] The feed ports 2 on the side of the processing chamber 1 are set as rectangular feed ports 2, and the microwave polarization directions of any rectangular feed port 2 on one side are perpendicular to the adjacent rectangular feed ports 2, and the microwave polarization directions of the corresponding rectangular feed ports 2 on the opposite sides are perpendicular to each other, so as to achieve good isolation between the feed ports 2, and make the electric field direction at the geometric center of each rectangular feed port 2 form an angle of 45 degrees with the horizontal direction to strengthen the interaction between the microwave and the material 4. Different feed ports 2 on different sides are allowed to work alternately, and a distributor is added between the feed port 2 that works later and the processing chamber 1 to improve the heating efficiency and protect the microwave source.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microwave processing box, comprising a processing chamber (1), wherein N feed ports (2) are provided on at least one of the sides surrounding the processing chamber (1), wherein the feed ports (2) are used to connect a microwave source to feed microwaves into the processing chamber (1), and wherein: The angle between the electric field direction at the geometric center of the cross section of at least one of the feed ports (2) and the horizontal plane is an acute angle or an obtuse angle, and N is a natural number greater than or equal to 2.

2. The microwave processing box according to claim 1, characterized in that: The angle between the electric field direction at the geometric center of the cross section of the feed port (2) and the horizontal plane is 30° to 60° or 120° to 150°.

3. The microwave processing box according to claim 1, characterized in that: The processing chamber (1) is axially along a vertical direction, and has a cross-sectional shape of a quadrilateral column or cone. The side on which the feed port (2) is provided is one, two or three of the side A, side B and side C. During operation, the feed ports (2) on the side A, side B and side C are divided into at least two groups, and the feed ports (2) on the two groups work alternately.

4. The microwave processing box according to claim 1, characterized in that: The angle between the electric field direction at the geometric center of the cross section of the feed port (2) and the horizontal plane is 40° to 50° or 130° to 140°.

5. The microwave processing box according to claim 4, characterized in that: Among the N feed ports (2) on each side, each feed port (2) has at least one feed port (2) adjacent in the horizontal direction or the vertical direction, and the angle between the electric field directions at the geometric centers of the cross sections of the adjacent feed ports (2) is 80-100°.

6. The microwave processing box according to any one of claims 4 or 5, characterized in that: The side surface A and the side surface C are opposite surfaces. Among the feed ports (2) of the side surface A, the vertical projection of the center point of at least one feed port (2) on the side surface C coincides with the center point of a feed port (2) on the side surface C. The angle between the electric field directions at the geometric centers of the cross sections of the two feed ports (2) is 80 to 100 degrees.

7. The microwave processing box according to claim 1, characterized in that: At least one cargo tray (3) for placing materials (4) is arranged in the processing chamber (1); the cargo tray (3) is a plate-shaped structure, and the distance between its upper surface and the center point of at least one feed port (2) is less than 0.2 times or 0.4 times the side length of the feed port (2).

8. The microwave processing box according to claim 1, characterized in that: At least one cargo tray (3) for placing materials (4) is arranged in the processing chamber (1), and the cargo tray (3) comprises a tray bottom and a side surface, which enclose a columnar hollow part or a conical hollow part, and the vertical distance between the height center point of the columnar hollow part or the conical hollow part and the center point of at least one feed port (2) is less than 0.4 times the length of the long side of the feed port (2).

9. The microwave processing box according to claim 8, characterized in that: The cargo tray (3) comprises a tray bottom and side surfaces, which enclose a columnar hollow portion or a conical hollow portion, and the vertical distance between the center point of the height of the columnar hollow portion or the conical hollow portion and the center point of at least one feed port (2) is less than 0.2 times the length of the long side of the rectangular feed port (2).

10. A microwave working mode, characterized in that: The microwave processing box according to any one of claims 1 to 9 comprises: The feed ports (2) on the side of the processing chamber (1) are set as rectangular feed ports (2), the microwave polarization directions of any rectangular feed port (2) on one side are perpendicular to the adjacent rectangular feed port (2), and the microwave polarization directions of the corresponding rectangular feed ports (2) on the opposite side are perpendicular to each other, so as to achieve good isolation between the feed ports (2), and the electric field direction at the geometric center of each rectangular feed port (2) forms an angle of 45 degrees with the horizontal direction, so as to strengthen the interaction between the microwave and the material (4); different feed ports (2) on different sides are allowed to work alternately, and a distributor is added between the feed port (2) that works later and the processing chamber (1) to improve the heating efficiency and protect the microwave source.

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