Microwave oven with temperature control function and low-temperature drying method
By introducing temperature-controlled switches and two-dimensional periodic structures into the microwave oven, the overheating or combustion problems caused by uneven material treatment during the heating or drying process of existing microwave ovens are solved, and a more uniform and safe heating or drying effect is achieved.
Patent Information
- Application Number
- CN202411829320.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-03-04
AI Technical Summary
During the heating or drying process of existing microwave ovens, due to the uneven density and humidity of the material in the treatment chamber and the uneven distribution of microwave fields, the heated material is unevenly processed and easily overheated or burned.
Design a microwave oven with temperature control. By setting a temperature control switch on or inside the microwave oven housing, the local temperature of the processing chamber is detected, and the disconnection or closing of the microwave source power supply is controlled through the temperature control switch to prevent local overheating or combustion. At the same time, a two-dimensional periodic structure is used to prevent the propagation of microwaves on the horizontal plane, ensuring the uniform distribution of microwave energy.
Effectively prevent local overheating or combustion caused by unevenness of the heated material, ensure the uniformity and safety of the heating or drying process, and is especially suitable for low-temperature drying and deep drying processes.
Smart Images
Figure CN119562400A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of microwaves, and in particular to a microwave oven with temperature control and a low-temperature drying method. Background Art
[0002] Domestic microwave ovens and tunnel-type industrial microwave ovens have been widely used in households and industrial and agricultural production. Microwave ovens use microwaves to process materials in a processing chamber, including but not limited to heating, thawing, drying, sterilizing, sintering, etc.
[0003] Ordinary microwave ovens include a processing chamber, a feed port and processed materials. During the operation of the microwave oven, when the processed materials are subjected to high-temperature heating or deep drying, the density and humidity of the materials in the processing chamber are uneven, and the electromagnetic field is unevenly distributed and cannot be accurately controlled, resulting in uneven processing of the heated materials, which may lead to overheating or even burning.
[0004] The above background technology is for facilitating the understanding of the present invention and is not a known technology disclosed to the general public before the application of the present invention. Summary of the invention
[0005] In view of the above-mentioned defects, the present invention provides a microwave oven with temperature control, which aims to improve at least one problem mentioned in the background technology.
[0006] The technical solution is: a microwave oven with temperature control, including at least one processing chamber and a microwave oven shell surrounding the processing chamber, at least one feed port is opened on the microwave oven shell, at least one feed port is connected to a microwave source, the microwave source generates microwaves and feeds the microwaves into the processing chamber through the feed port, and a temperature control switch is connected in series to the power line of at least one microwave source.
[0007] Furthermore, the temperature sensing part of the temperature control switch passes through the microwave oven housing, and the depth of the temperature sensing part of the temperature control switch entering the microwave oven housing can be adjusted from outside the processing cavity.
[0008] Furthermore, the temperature control switch is of a normally closed type, and the disconnection temperature is lower than 100° or 60°.
[0009] Furthermore, the microwave oven also includes a conveyor belt, which passes through the processing chamber, and the processed material is located on the conveyor belt.
[0010] Furthermore, the feed port is arranged at the bottom of the processing chamber.
[0011] Furthermore, the minimum distance between at least one temperature-controlled switch and at least one feed port along the moving direction of the conveyor belt is less than 0.5 times the maximum dimension of the microwave feed port cross section, and the temperature-controlled switch is located behind the feed port along the moving direction of the conveyor belt.
[0012] Furthermore, the minimum distance between at least one temperature-controlled switch and at least one feed port along the moving direction of the conveyor belt is less than 0.2 times the maximum dimension of the microwave feed port cross section, and the temperature-controlled switch is located behind the feed port along the moving direction of the conveyor belt.
[0013] The feed port is arranged at the bottom of the processing chamber, and the temperature control switch is arranged at the bottom or the top of the processing chamber. In a preferred design, the temperature control switch is arranged at the bottom of the processing chamber.
[0014] Furthermore, a two-dimensional periodic structure is provided at the top of the processing chamber, and the two-dimensional periodic structure is located above at least one feed port. The number of units of the two-dimensional periodic structure in at least three directions along the horizontal direction outward from the intersection of the normal line of the geometric center point of at least one feed port and the top of the processing chamber is greater than 2. In a preferred design, the number of units of the two-dimensional periodic structure in all four directions along the horizontal direction outward from the intersection of the normal line of the geometric center point of each feed port and the top of the processing chamber is greater than 2.
[0015] Furthermore, the two-dimensional periodic structure includes periodic protrusions or depressions arranged in rows and columns. The two-dimensional periodic structure is arranged to form a band-stop structure for microwaves between the bottom and the top of the processing chamber, so that microwaves of the working frequency cannot propagate in the horizontal direction between the top and the bottom of the processing chamber after being fed into the processing chamber through the feed port, but can only decay exponentially.
[0016] The invention also provides a low-temperature drying method.
[0017] The technical solution is: a low-temperature drying method using the above-mentioned microwave oven with temperature control, comprising:
[0018] The temperature switch is used to control whether to heat. For ordinary microwave treatment, the disconnection temperature of the temperature switch is lower than 100°. Low temperature treatment of the treated material is beneficial to protect the chemical components therein. The disconnection temperature of the temperature switch is lower than 60° or lower than 30°.
[0019] Prevent microwaves from propagating in the horizontal plane through a two-dimensional periodic structure;
[0020] By arranging the temperature control switch near each feed port and at the rear of the conveyor belt in the moving direction and placing the temperature control switch as close to the corresponding feed port as possible, a quick response is facilitated.
[0021] Compared with the prior art, the inventive principle and beneficial effects of the present invention are:
[0022] The present invention can prevent local overheating or burning of the heated material due to various unevenness (including but not limited to uneven material density, uneven material humidity and uneven microwave field intensity distribution) by arranging a temperature control switch on or in the shell of the processing chamber. By using a two-dimensional photonic crystal to form a processing chamber, different feed ports are isolated from each other. At the same time, one or more temperature control switches are arranged corresponding to each feed port. When the temperature near a feed port is too high, the power supply of the microwave source of the feed port is accurately turned off to prevent the temperature from further rising. When the temperature near the feed port drops, the microwave source resumes work. Furthermore, a photonic crystal microwave tunnel furnace is formed by arranging a conveyor belt, and one or more temperature control switches are arranged near the rear of each feed port along the moving direction of the conveyor belt to prevent overheating or burning in the tunnel furnace.
[0023] The invention can be used for expansion, sterilization, deep drying and sintering of various materials, and can be safely used for low-temperature drying, especially low-temperature deep drying. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention;
[0025] Figure 2 It is a schematic diagram of the overall structure of Embodiment 2 of the present invention;
[0026] In the figure, 1-processing chamber, 2-feed port, 3-processed material, 4-temperature control switch, 5-two-dimensional periodic structure, 6-conveyor belt, 11-bottom. DETAILED DESCRIPTION
[0027] The present invention will be further described below in conjunction with the accompanying drawings.
[0028] 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.
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] The term "feed port" in the specification of the present application and the above-mentioned drawings refers to a hole leading to the processing chamber, which is generally a section of a cylindrical or hollow conical metal body.
[0034] In the present invention, the temperature control switch, also known as the thermostat, refers to a type of control element that disconnects or closes a wire according to the temperature change of the working environment, generally including a temperature sensing part, a thermistor component and two wires. The temperature sensing part is in contact with the monitored object. When the temperature change of the temperature sensing part reaches a critical value, the thermistor component is triggered to disconnect or close the two wires.
[0035] Example 1
[0036] Please refer to Figure 1 , Figure 1 It is a schematic diagram of the overall structure of this embodiment.
[0037] A microwave oven with temperature control includes a processing chamber 1, at least one feed port 2 is provided on the microwave oven shell surrounding the processing chamber 1, at least one feed port 2 is connected to a microwave source, a processed material 3 is placed in the processing chamber 1, the microwave source generates microwaves and feeds the microwaves into the processing chamber 1 through the feed port 2, and a temperature control switch 4 is connected in series to the power line of at least one microwave source. The purpose of the temperature control switch 4 is to detect the local temperature of the processing chamber 1 so as to control the power supply of the microwave source to be disconnected or closed. The temperature control switch 4 can prevent the heated material from being locally overheated or burned due to various unevenness.
[0038] The temperature control switch 4 can be arranged on the microwave oven housing, and can also be arranged in the microwave oven housing.
[0039] In one or more embodiments of the present invention, the temperature control switch 4 is a normally closed type, and when the temperature of the monitored object is lower than a certain low temperature critical value, the temperature control switch 4 is closed. When the temperature of the monitored object reaches a certain high temperature critical value, the temperature control switch 4 is opened.
[0040] In one or more embodiments of the present invention, the temperature sensing portion of the temperature control switch 4 can pass through the microwave oven housing, and the depth of the temperature sensing portion of the temperature control switch 4 entering the microwave oven housing can be adjusted from outside the processing chamber 1. Under certain critical temperature conditions, the temperature sensing portion of the temperature control switch 4 can be controlled to enter the processing chamber to disconnect when the temperature is higher than a certain value above the critical temperature.
[0041] In one or more embodiments of the present invention, the processed material 3 is located between the temperature control switch 4 and the feed port 2 .
[0042] In one or more embodiments of the present invention, the temperature sensing portion of the temperature control switch 4 is located below the processed material 3 and is in contact with or close to the supporting structure of the processed material 3 .
[0043] In one or more embodiments of the present invention, a two-dimensional periodic structure 5 is disposed on the top of the processing chamber 1, and the two-dimensional periodic structure 5 is located above at least one feed port 2. The purpose of disposing the two-dimensional periodic structure 5 is to prevent microwaves from propagating on a horizontal plane.
[0044] In one or more embodiments of the present invention, the two-dimensional periodic structure 5 is arranged in at least 2 rows and 2 columns along four mutually perpendicular directions in the horizontal direction around the normal line of the center point of the feed port 2, and is a periodic protrusion or depression in the same plane. After the two-dimensional periodic structure 5 is set, the top and bottom of the processing chamber 1 form a photonic crystal structure, which produces a band-stop effect on microwaves, so that the microwaves generated by the microwave source connected to the feed port 2 cannot propagate from the feed port 2 along the top and bottom of the processing chamber 1 on the horizontal plane.
[0045] During operation, for ordinary microwave treatment, such as green tea withering, the disconnection temperature of the temperature control switch 4 is lower than 100°. Since the temperature of the monitored object may be higher than the temperature of the temperature sensing part of the temperature control switch 4, at this time, the temperature of the monitored object can be controlled at about 100°. Low temperature treatment of the treated material 3 is beneficial to protect the chemical components therein. At this time, the disconnection temperature of the temperature control switch 4 can be lower than 60°, or even lower than 30°. When the detected temperature is too high, the power supply is accurately turned off to prevent the temperature from further rising.
[0046] Example 2
[0047] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the overall structure of this embodiment. Figure 2 In the diagram, the X direction is the horizontal direction, the Y direction is the vertical direction, and the Z direction is the longitudinal direction. The X, Y, and Z directions form a Cartesian coordinate system.
[0048] A microwave oven with temperature control, which is an industrial microwave oven or a microwave tunnel oven, comprises at least one processing chamber 1, a microwave oven shell surrounding the processing chamber 1, and a conveyor belt 6, wherein the conveyor belt 6 passes through the processing chamber 1, and the processed material 3 is located on the conveyor belt 6. The microwave oven shell is provided with at least one feed port 2, wherein at least one feed port 2 is connected to a microwave source, and the microwave source generates microwaves and feeds the microwaves into the processing chamber 1 through the feed port 2. A temperature control switch 4 is connected in series to the power line of at least one microwave source, and the purpose of the temperature control switch 4 is to detect the local temperature of the processing chamber 1 so as to control the power supply of the microwave source to be disconnected or closed. The temperature control switch 4 can prevent the heated material from being locally overheated or burned due to various unevenness. The conveyor belt 6 runs along the Z direction.
[0049] The temperature control switch 4 can be arranged on the microwave oven housing, and can also be arranged in the microwave oven housing.
[0050] The feed port 2 can be arranged at any position of the microwave oven housing.
[0051] In one or more embodiments of the present invention, the temperature sensing portion of the temperature control switch 4 is located below the conveyor belt 6 and is in contact with or close to the conveyor belt 6 .
[0052] In one or more embodiments of the present invention, the temperature control switch 4 is a normally closed type, and when the temperature of the monitored object is lower than a certain low temperature critical value, the temperature control switch 4 is closed. When the temperature of the monitored object reaches a certain high temperature critical value, the temperature control switch 4 is opened.
[0053] In one or more embodiments of the present invention, the temperature sensing portion of the temperature control switch 4 can pass through the microwave oven housing, and the depth of the temperature sensing portion of the temperature control switch 4 entering the microwave oven housing can be adjusted from outside the processing chamber 1. Under certain critical temperature conditions, the temperature sensing portion of the temperature control switch 4 can be controlled to enter the processing chamber to disconnect when the temperature is higher than a certain value above the critical temperature.
[0054] In one or more embodiments of the present invention, a two-dimensional periodic structure 5 is disposed on the top of the processing chamber 1, and the two-dimensional periodic structure 5 is located above at least one feed port 2. The purpose of disposing the two-dimensional periodic structure 5 is to prevent microwaves from propagating on a horizontal plane.
[0055] In one or more embodiments of the present invention, the two-dimensional periodic structure 5 is arranged in at least 2 rows and 2 columns along four mutually perpendicular directions in the horizontal direction around the normal line of the center point of the feed port 2, and is a periodic protrusion or depression in the same plane. After the two-dimensional periodic structure 5 is set, the top and bottom of the processing chamber 1 form a photonic crystal structure, which produces a band-stop effect on microwaves, so that the microwaves generated by the microwave source connected to the feed port 2 cannot propagate from the feed port 2 along the top and bottom of the processing chamber 1 on the horizontal plane.
[0056] In one or more embodiments of the present invention, the feed port 2 is arranged at the bottom 11 of the processing chamber 1, and the processing chamber 1 is provided with three feed ports 2, and each feed port 2 corresponds to a temperature control switch 4 behind the moving direction of the conveyor belt 6, and the minimum distance between the feed port 2 and the corresponding feed port 2 is less than 0.5 times the maximum size of the cross section of the feed port 2. In another one or more embodiments of the present invention, the feed port 2 is arranged at the bottom 11 of the processing chamber 1, and the processing chamber 1 is provided with three feed ports 2, and each feed port 2 corresponds to a temperature control switch 4 behind the moving direction of the conveyor belt 6, and the minimum distance between the feed port 2 and the corresponding feed port 2 is less than 0.2 times the maximum size of the cross section of the feed port 2. Through this design, the temperature of the processed material 3 on the conveyor belt 6 after passing through each feed port 2 can be monitored. When the temperature exceeds a certain high temperature critical value, the temperature control switch 4 is disconnected, and the power supply of the microwave source connected to the feed port 2 is cut off to prevent the subsequent processed materials from overheating or burning. When the temperature is lower than a certain low temperature critical value, the temperature control switch 4 is closed, the power of the microwave source connected to the feed port 2 is turned on, and the subsequently processed material 3 can continue to be processed by microwaves.
[0057] During operation, for common microwave treatment, such as green tea withering, the disconnection temperature of the temperature control switch 4 is lower than 100°. Since the temperature of the monitored object may be higher than the temperature of the temperature sensing part of the temperature control switch 4, the temperature of the monitored object can be controlled at about 100°. Low temperature treatment of the treated material 3 is beneficial to protecting the chemical components therein, and at this time, the disconnection temperature of the temperature control switch 4 can be lower than 60°, or even lower than 30°.
[0058] The present invention also provides a low-temperature drying method, which uses the above-mentioned microwave oven with temperature control.
[0059] A low-temperature drying method, using the above-mentioned microwave oven with temperature control, comprises:
[0060] The temperature control switch is used to control whether to heat. For ordinary microwave treatment, such as green tea withering, the disconnection temperature of the temperature control switch 4 is lower than 100°. Low-temperature treatment of the treated material 3 is beneficial to protecting the chemical components therein. At this time, the disconnection temperature of the temperature control switch 4 can be lower than 60°, or even lower than 30°.
[0061] The two-dimensional periodic structure 5 prevents the propagation of microwaves in the horizontal plane.
[0062] By arranging the temperature control switch 4 near each feed port 2 and behind the moving direction of the conveyor belt 6 and bringing the temperature control switch 4 and the corresponding feed port 2 as close as possible, a quick response is facilitated.
[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 oven with temperature control, comprising at least one processing chamber (1) and a microwave oven shell surrounding the processing chamber (1), wherein at least one feed port (2) is provided on the microwave oven shell, wherein the at least one feed port (2) is connected to a microwave source, wherein the microwave source generates microwaves and feeds the microwaves into the processing chamber (1) through the feed port (2), ... A temperature control switch (4) is connected in series to the power line of at least one microwave source.
2. The microwave oven with temperature control according to claim 1, characterized in that: The temperature sensing part of the temperature control switch (4) passes through the shell of the microwave oven, and the depth of the temperature sensing part of the temperature control switch (4) entering the shell of the microwave oven can be adjusted from outside the processing chamber (1).
3. The microwave oven with temperature control according to claim 1, characterized in that: The temperature control switch (4) is of a normally closed type, and the disconnection temperature is lower than 100° or 60°.
4. The microwave oven with temperature control according to any one of claims 1 to 3, characterized in that: The microwave oven further comprises a conveyor belt (6), the conveyor belt (6) passing through the processing chamber (1), and the processed material (3) is located on the conveyor belt (6).
5. The microwave oven with temperature control according to claim 4, characterized in that: The feed port (2) is arranged at the bottom (11) of the processing chamber (1).
6. The microwave oven with temperature control according to claim 4, characterized in that: The minimum distance between at least one temperature-controlled switch (4) and at least one feed port (2) along the direction of movement of the conveyor belt (6) is less than 0.5 times the maximum dimension of the cross section of the microwave feed port, and the temperature-controlled switch (4) is located behind the feed port (2) along the direction of movement of the conveyor belt (6).
7. The microwave oven with temperature control according to claim 4, characterized in that: The minimum distance between at least one temperature-controlled switch (4) and at least one feed port (2) along the direction of movement of the conveyor belt (6) is less than 0.2 times the maximum dimension of the cross section of the microwave feed port, and the temperature-controlled switch (4) is located behind the feed port (2) along the direction of movement of the conveyor belt (6).
8. The microwave oven with temperature control according to any one of claims 1 to 7, characterized in that: A two-dimensional periodic structure (5) is arranged at the top of the processing chamber (1), and the feed port (2) is arranged at the bottom of the processing chamber (1); the number of units of the two-dimensional periodic structure (5) in at least three directions along the horizontal direction outward from the intersection of a normal line passing through a geometric center point of at least one feed port (2) and the top of the processing chamber (1) is greater than 2.
9. The microwave oven with temperature control according to claim 8, characterized in that: The two-dimensional periodic structure (5) comprises periodic protrusions or depressions arranged in rows and columns.
10. A low-temperature drying method using a microwave oven with temperature control according to any one of claims 1 to 9, characterized in that: include: Whether heating is performed is controlled by a temperature control switch. For ordinary microwave treatment, the disconnection temperature of the temperature control switch (4) is lower than 100°. Low temperature treatment of the treated material (3) is beneficial to protecting the chemical components therein. The disconnection temperature of the temperature control switch (4) is lower than 60° or lower than 30°. The two-dimensional periodic structure (5) is used to prevent the propagation of microwaves in the horizontal plane; By arranging the temperature control switch (4) near each feed port (2) at the rear along the moving direction of the conveyor belt (6) and placing the temperature control switch (4) and the corresponding feed port (2) as close as possible, a quick response is facilitated.