Microwave oven with temperature control function
By incorporating a temperature control switch and a two-dimensional photonic crystal structure into the microwave oven casing, the problem of uneven heating in microwave ovens was solved, achieving safe low-temperature processing.
Patent Information
- Application Number
- CN202423069755.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing microwave ovens may experience uneven heating due to uneven material density, humidity, and electromagnetic field distribution within the processing cavity, which could lead to localized overheating or combustion.
A temperature control switch is installed on or inside the microwave oven casing. The power supply of the microwave source is controlled by sensing the local temperature of the processing cavity. Combined with a two-dimensional photonic crystal structure to isolate the feed port, local overheating or combustion is prevented.
It achieves uniform heating of the heated material, avoiding local overheating or combustion, and is particularly suitable for low-temperature treatment such as low-temperature drying, thus protecting the chemical composition of the material.
Smart Images
Figure CN223729953U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of microwave, especially a microwave oven with temperature control. BACKGROUND
[0002] Household microwave ovens and tunnel type industrial microwave ovens have been widely used in family and industrial and agricultural production. Microwave ovens use microwaves to process materials in the processing cavity, including but not limited to heating, thawing, drying, sterilization, sintering, etc.
[0003] The ordinary microwave oven includes a processing cavity, a feed port and a material to be processed. During the operation of the microwave oven, when the material to be processed is heated at high temperature or processed by deep drying, etc., due to the uneven density and humidity of the material in the processing cavity, and due to the uneven distribution of the electromagnetic field and the inability to accurately control, the heated material is unevenly processed, resulting in overheating or even burning.
[0004] The above background is for the convenience of understanding the utility model, and is not a known technology publicly disclosed to the general public before the application of the utility model. CONTENT OF THE UTILITY MODEL
[0005] In view of the above defects, the utility model provides a microwave oven with temperature control, which aims to improve at least one problem mentioned in the background art.
[0006] The technical scheme is: a microwave oven with temperature control, including at least one processing cavity and a microwave oven shell surrounding the processing cavity, at least one feed port is formed on the microwave oven shell, at least one feed port is connected with a microwave source, the microwave source generates microwaves and feeds the microwaves into the processing cavity through the feed port, and a temperature control switch is connected in series on the power line of the at least one microwave source.
[0007] Further, the temperature control switch is arranged on or in the microwave oven shell.
[0008] Further, the temperature sensing part of the temperature control switch penetrates through the microwave oven shell, and the depth of the temperature sensing part of the temperature control switch into the microwave oven shell can be adjusted from outside the processing cavity.
[0009] Further, the temperature control switch is normally closed.
[0010] Further, the temperature control switch includes a temperature sensing part, a heat sensitive component and two wires, and the temperature sensing part is in contact with the monitored object.
[0011] Further, the disconnection temperature of the temperature control switch is lower than 100° or the disconnection temperature of the temperature control switch is lower than 60°.
[0012] Further, the microwave oven further comprises a conveyor belt, the conveyor belt passing through the processing cavity, and the material to be processed being located on the conveyor belt.
[0013] Further, the feed port is arranged at the bottom of the processing cavity.
[0014] Further, the minimum distance between the at least one temperature control switch and the at least one feed port in the moving direction of the conveyor belt is less than 0.2 or 0.5 times the maximum dimension of the cross section of the microwave feed port, and the temperature control switch is located behind the feed port in the moving direction of the conveyor belt.
[0015] Further, the two-dimensional periodic structure is located above the at least one feed port arranged at the bottom of the processing cavity, and the number of units of the two-dimensional periodic structure in at least three directions outward in the horizontal direction from the intersection of the normal line of the geometric center point of the at least one feed port and the top of the processing cavity is greater than 2, and the two-dimensional periodic structure comprises periodic protrusions or recesses arranged in rows and columns.
[0016] Compared with the prior art, the utility model has the advantages of novel utility model principle and beneficial effects.
[0017] The utility model discloses a temperature control switch is arranged on the shell or in the shell of the processing cavity, which can prevent the local overheating or burning of the heated material caused by various unevennesses (including but not limited to uneven material density, uneven material humidity and uneven microwave field intensity distribution). The two-dimensional photonic crystal is used to form the processing cavity, and the different feed ports are isolated from each other. One or more temperature control switches are arranged corresponding to each feed port, and when the temperature near the feed port is too high, the power supply of the microwave source of the feed port is accurately turned off to prevent the further increase of the temperature, and when the temperature near the feed port is reduced, the microwave source resumes work. Further, the conveyor belt is arranged to form the photonic microwave tunnel furnace, and one or more temperature control switches are arranged near the rear of each feed port in the moving direction of the conveyor belt, to prevent the overheating or burning in the tunnel furnace.
[0018] The utility model can be used for the puffing, 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 DRAWINGS
[0019] Figure 1 It is the whole structure schematic diagram of the utility model embodiment 1;
[0020] Figure 2 It is the whole structure schematic diagram of the utility model embodiment 2;
[0021] In the drawing, 1 is processing cavity, 2 is feed port, 3 is material to be processed, 4 is temperature control switch, 5 is two-dimensional periodic structure, 6 is conveyor belt, 11 is bottom. DETAILED DESCRIPTION
[0022] The utility model will be described further below with reference to the drawings.
[0023] In the description of the utility model, it needs to be explained that, unless there is explicit provision and limitation, the terms "mount", "connect", "connection" should be understood in broad sense, for example, it can be fixed connection, also can be indirectly connected through intermediate medium, can be the communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0024] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "multiple" is two or more than two, unless there is accurate and specific provision.
[0025] The terms "first", "second", "third", "fourth" and the like in the specification of the present application and the above drawings (if any) are used to distinguish similar objects, and do not have to be used to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0027] The technical scheme of the utility model will be explained in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described in some examples.
[0028] The term "feedthrough" in the specification and the above-mentioned drawings refers to a hole leading to the processing cavity, which is generally a cylindrical or hollow conical metal body.
[0029] In the utility model, the temperature control switch, also known as a temperature controller, refers to a type of control element that disconnects or closes the wires according to the temperature change of the working environment, which generally includes a temperature sensing part, a thermal 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 the critical value, the thermal component is triggered to disconnect or close the two wires.
[0030] Example 1
[0031] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the overall structure of the embodiment.
[0032] A microwave oven with temperature control includes a processing cavity 1, at least one feedthrough 2 is provided on the microwave oven shell surrounding the processing cavity 1, at least one feedthrough 2 is connected to a microwave source, a processed material 3 is placed in the processing cavity 1, the microwave source generates microwaves and feeds them into the processing cavity 1 through the feedthrough 2, and a temperature control switch 4 is connected in series on the power line of at least one microwave source. The purpose of setting the temperature control switch 4 is to detect the local temperature of the processing cavity 1 to disconnect or close the power supply of the microwave source. Through the temperature control switch 4, it can prevent the heated material from being overheated or burned due to various unevenness.
[0033] The temperature control switch 4 can be arranged on the microwave oven shell or in the microwave oven shell.
[0034] In one or more embodiments of the utility model, the temperature control switch 4 is normally closed, 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 disconnected.
[0035] In one or more embodiments of the utility model, the temperature sensing part of the temperature control switch 4 can pass through the microwave oven shell and enter the microwave oven shell to a depth that can be adjusted from the outside of the processing cavity 1. Under certain critical temperature conditions, the depth of the temperature sensing part of the temperature control switch 4 into the processing cavity can be controlled to make the temperature control switch 4 disconnect when it is higher than a certain value above its critical temperature.
[0036] In one or more embodiments of the utility model, the processed material 3 is located between the temperature control switch 4 and the feedthrough 2.
[0037] In one or more embodiments of the present application, the temperature sensing part of the temperature-controlled switch 4 is located below the material being processed 3, in contact with or close to the support structure of the material being processed 3.
[0038] In one or more embodiments of the present application, the top of the processing cavity 1 is provided with a two-dimensional periodic structure 5, which is located above at least one feed opening 2. The purpose of the two-dimensional periodic structure 5 is to prevent the propagation of microwaves in the horizontal plane.
[0039] In one or more embodiments of the present application, the two-dimensional periodic structure 5 is arranged in at least 2 rows and 2 columns in four mutually perpendicular directions around the normal of the center point of the feed opening 2 in the horizontal direction, and is periodic in the same plane as a protrusion or a recess. After the two-dimensional periodic structure 5 is arranged, the top and bottom of the processing cavity 1 form a photonic crystal structure, which has a band-stop effect on microwaves, preventing microwaves generated by the microwave source connected to the feed opening 2 from propagating in the horizontal plane between the top and bottom of the processing cavity 1 through the feed opening 2.
[0040] In operation, for ordinary microwave processing, such as green tea fixation, the temperature at which the temperature-controlled switch 4 is turned off is less than 100°. Since the temperature of the object being monitored can be higher than the temperature of the temperature sensing part of the temperature-controlled switch 4, the temperature of the object being monitored can be controlled to about 100°. Low-temperature processing of the material being processed 3 is beneficial to the protection of the chemical components therein. At this time, the temperature at which the temperature-controlled switch 4 is turned off 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 further temperature rise.
[0041] Example 2
[0042] Please refer to Figure 2 , Figure 2 for the overall structure of this embodiment, Figure 2 In this embodiment, 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.
[0043] A microwave oven with temperature control, for industrial microwave oven or microwave tunnel oven, comprising at least one processing cavity 1, a microwave oven shell surrounding the processing cavity 1, and a conveyor belt 6 passing through the processing cavity 1, the material 3 to be processed is located on the conveyor belt 6, at least one feed port 2 is opened on the microwave oven shell, at least one microwave source is connected to the feed port 2, the microwave source generates microwaves and feeds the microwaves into the processing cavity 1 through the feed port 2, and a temperature control switch 4 is connected in series on the power line of the at least one microwave source. The purpose of the temperature control switch 4 is to detect the local temperature of the processing cavity 1 so as to control the power supply of the microwave source to be disconnected or closed. Through the temperature control switch 4, the heated material can be prevented from being locally overheated or burned due to various unevenness. The conveyor belt 6 runs along the Z direction.
[0044] The temperature control switch 4 can be arranged on the microwave oven shell or in the microwave oven shell.
[0045] The feed port 2 can be arranged at any position of the microwave oven shell.
[0046] In one or more embodiments of the present application, the temperature sensing part of the temperature control switch 4 is located below the conveyor belt 6 and in contact with or close to the conveyor belt 6.
[0047] In one or more embodiments of the present application, the temperature control switch 4 is normally closed, and when the temperature of the monitored object is lower than a certain low temperature threshold, the temperature control switch 4 is closed. When the temperature of the monitored object reaches a certain high temperature threshold, the temperature control switch 4 is disconnected.
[0048] In one or more embodiments of the present application, the temperature sensing part of the temperature control switch 4 can pass through the microwave oven shell and enter the microwave oven shell to a depth that can be adjusted from the outside of the processing cavity 1. Under certain critical temperature conditions, the depth of the temperature sensing part of the temperature control switch 4 into the processing cavity can be controlled to allow the temperature control switch 4 to be disconnected when the temperature is higher than the critical temperature by a certain value.
[0049] In one or more embodiments of the present application, the top of the processing cavity 1 is provided with a two-dimensional periodic structure 5, which is located above the at least one feed port 2. The purpose of the two-dimensional periodic structure 5 is to prevent the propagation of microwaves in the horizontal plane.
[0050] In one or more embodiments of the present application, the two-dimensional periodic structure 5 is arranged in at least 2 rows and 2 columns in four mutually perpendicular directions along the horizontal direction around the normal line of the center point of the feed port 2, and is periodic in the same plane. After the two-dimensional periodic structure 5 is arranged, the top and bottom of the processing cavity 1 form a photonic crystal structure, which has a band-stop effect on microwaves, so that the microwaves generated by the microwave source connected to the feed port 2 cannot propagate in the horizontal plane between the top and bottom of the processing cavity 1 through the feed port 2. In one or more embodiments of the present application, the two-dimensional periodic structure 5 is arranged in at least 2 rows and 2 columns in four mutually perpendicular directions along the horizontal direction around the normal line of the center point of the feed port 2, and is periodic in the same plane. After the two-dimensional periodic structure 5 is arranged, the top and bottom of the processing cavity 1 form a photonic crystal structure, which has a band-stop effect on microwaves, so that the microwaves generated by the microwave source connected to the feed port 2 cannot propagate in the horizontal plane between the top and bottom of the processing cavity 1 through the feed port 2.
[0051] In one or more embodiments of the present application, the feedthroughs 2 are arranged on the bottom 11 of the processing chamber 1, and the processing chamber 1 is provided with three feedthroughs 2, each of which corresponds to a temperature control switch 4 behind the movement direction of the conveyor belt 6, and the minimum distance between the feedthrough 2 and the corresponding feedthrough 2 is less than 0.5 times the maximum cross-sectional dimension of the feedthrough 2. In another or more embodiments of the present application, the feedthroughs 2 are arranged on the bottom 11 of the processing chamber 1, and the processing chamber 1 is provided with three feedthroughs 2, each of which corresponds to a temperature control switch 4 behind the movement direction of the conveyor belt 6, and the minimum distance between the feedthrough 2 and the corresponding feedthrough 2 is less than 0.2 times the maximum cross-sectional dimension of the feedthrough 2. Through this design, the temperature of the processed material 3 on the conveyor belt 6 after passing through each feedthrough 2 can be monitored. When the temperature exceeds a certain high temperature threshold, the temperature control switch 4 is turned off, and the power supply of the microwave source connected to the feedthrough 2 is cut off to prevent subsequent processed materials from overheating or burning. When the temperature is below a certain low temperature threshold, the temperature control switch 4 is closed, and the power supply of the microwave source connected to the feedthrough 2 is turned on, and the subsequent processed material 3 can be continuously processed by the microwave.
[0052] When working, for ordinary microwave processing, such as green tea fixation, the temperature at which the temperature control switch 4 is turned off is below 100°. Since the temperature of the monitored object can 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 processing of the processed material 3 is beneficial to protect the chemical components therein, and the temperature at which the temperature control switch 4 is turned off can be below 60°, or even below 30°.
[0053] The present application also provides a low-temperature drying method, which uses the above-mentioned microwave oven with temperature control.
[0054] A low-temperature drying method, which uses the above-mentioned microwave oven with temperature control, comprises:
[0055] The temperature control switch controls whether to heat or not. For ordinary microwave processing, such as green tea fixation, the temperature at which the temperature control switch 4 is turned off is below 100°, and low-temperature processing of the processed material 3 is beneficial to protect the chemical components therein, and the temperature at which the temperature control switch 4 is turned off can be below 60°, or even below 30°.
[0056] The two-dimensional periodic structure 5 prevents the propagation of microwaves in the horizontal plane.
[0057] The temperature control switch 4 is arranged near each feedthrough 2 behind the movement direction of the conveyor belt 6 and is as close as possible to the corresponding feedthrough 2, which facilitates rapid response.
[0058] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A microwave oven with temperature control, comprising at least one treatment cavity (1) and a microwave oven housing enclosing the treatment cavity (1), said microwave oven housing having at least one feed opening (2) formed therein, at least one feed opening (2) being connected to a microwave source which generates microwaves and feeds the microwaves into the interior of the treatment cavity (1) through the feed opening (2), characterized in that At least one power supply line of the microwave source is connected in series with a temperature control switch (4).
2. The microwave oven with temperature control according to claim 1, characterized in that, The temperature control switch (4) is arranged on or in the microwave oven housing.
3. The microwave oven with temperature control according to claim 1, characterized in that, The temperature sensing part of the temperature control switch (4) penetrates the microwave oven housing, and the depth of the temperature sensing part of the temperature control switch (4) into the microwave oven housing can be adjusted from outside the processing cavity (1).
4. The microwave oven with temperature control according to claim 1, characterized in that, The temperature control switch (4) is normally closed.
5. The microwave oven with temperature control according to claim 1, characterized in that, The temperature control switch (4) comprises a temperature sensing part, a thermal sensitive component and two wires, and the temperature sensing part is in contact with the object to be monitored.
6. The microwave oven with temperature control according to claim 4, characterized in that, The temperature control switch (4) has an opening temperature lower than 100° or lower than 60°.
7. The microwave oven with temperature control according to claim 1, characterized in that, The microwave oven further comprises a conveyor belt (6) which passes through the processing cavity (1) and on which the material (3) to be processed is located.
8. The microwave oven with temperature control according to claim 7, characterized in that, The feed port (2) is arranged at the bottom (11) of the processing cavity (1).
9. The microwave oven with temperature control according to claim 7, characterized in that, The minimum distance between at least one temperature control switch (4) and at least one feed port (2) in the direction of movement of the conveyor belt (6) is less than 0.2 or 0.5 times the maximum dimension of the cross section of the microwave feed port, and the temperature control switch (4) is located behind the feed port (2) in the direction of movement of the conveyor belt (6).
10. The microwave oven with temperature control according to any of claims 1-9, characterized in that, The top of the processing cavity (1) is provided with a two-dimensional periodic structure (5), and the feed port (2) is arranged at the bottom of the processing cavity (1); the number of units of the two-dimensional periodic structure (5) in at least three directions outward from the intersection of the normal line passing through the geometric center of at least one feed port (2) and the top of the processing cavity (1) is greater than 2, and the two-dimensional periodic structure (5) comprises periodic protrusions or recesses arranged in rows and columns.