Microwave heating device and system

Abstract

The embodiment of the present application discloses a microwave heating device and system. The microwave heating device includes a microwave transmission line and a microwave feed port. The microwave transmission line includes a transmission conductor, an auxiliary medium and a transmission ground. The transmission ground is arranged around the transmission conductor to form a shielding shell. The auxiliary medium and the transmission conductor are arranged in the shielding shell. The transmission conductor includes a first end, and the first end of the transmission conductor passes through the shielding shell. The microwave feed port is connected to the first end. The microwave feed port is used to access the microwave signal. The shielding shell is used to place the object to be heated. The microwave heating device is used to heat the object to be heated. The embodiment of the present application realizes the miniaturization of the device and meets the needs of various application scenarios.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of microwave application technology, and in particular to a microwave heating device and system. Background Art

[0002] Compared with traditional heating methods, microwave heating greatly improves energy utilization, reduces energy loss, and has the advantages of high efficiency and environmental protection. Therefore, microwave heating has been widely used.

[0003] Most of the microwave heating technologies in the prior art are based on antenna coupling to a resonant cavity. The microwave signal is fed into the resonant cavity through the antenna, and resonance is achieved in the resonant cavity. The object to be heated in the resonant cavity moves back and forth at a high frequency under the action of the electromagnetic field, thereby achieving heating. Since the resonant frequency is closely related to the cavity size, it is difficult to achieve resonance in a small volume, resulting in the existing microwave heating devices being difficult to meet the volume requirements of various application scenarios. Summary of the invention

[0004] The embodiments of the present application provide a microwave heating device to solve or alleviate one or more technical problems in the prior art.

[0005] As one aspect of an embodiment of the present application, the embodiment of the present application provides a microwave heating device, comprising a microwave transmission line and a microwave feed port, wherein the microwave transmission line comprises a transmission conductor, an auxiliary medium and a transmission ground, wherein the transmission ground is arranged around the transmission conductor to form a shielding shell, and the auxiliary medium and the transmission conductor are arranged in the shielding shell; the transmission conductor comprises a first end, and the first end of the transmission conductor passes through the shielding shell; the microwave feed port is connected to the first end;

[0006] The microwave feeding port is used to access microwave signals;

[0007] The shielding shell is used to place the object to be heated;

[0008] The microwave heating device is used to heat the object to be heated.

[0009] As one aspect of an embodiment of the present application, an embodiment of the present application provides a microwave heating device, the microwave heating device is used to heat an object to be heated; the microwave heating device comprises a transmission conductor, a transmission ground and a microwave feed port; the transmission conductor, the transmission ground and the object to be heated form a microwave transmission line; the transmission ground is arranged around the transmission conductor to form a shielding shell, the transmission conductor is arranged in the shielding shell; the shielding shell is used to place the object to be heated;

[0010] The transmission conductor comprises a first end, and the first end of the transmission conductor passes through the shielding shell; the microwave feeding port is connected to the first end; and the microwave feeding port is used for receiving microwave signals.

[0011] As one aspect of an embodiment of the present application, an embodiment of the present application provides a microwave heating system, comprising a microwave generator and a microwave heating device provided by any embodiment of the present application; the microwave output end of the microwave generator is connected to the microwave feeding port of the microwave heating device.

[0012] The embodiment of the present application adopts the above technical solution, the transmission ground in the microwave transmission line forms a shielding shell, and the microwave signal energy transmitted by the microwave transmission line is absorbed and lost by the object to be heated during the transmission along the transmission conductor in the shielding shell, thereby heating the object to be heated. The transmission ground in the microwave transmission line serves as a shielding shell, and its size and shape are not restricted, so the volume of the device can be miniaturized to meet the needs of various application scenarios.

[0013] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0015] Figure 1 A schematic structural diagram of a microwave heating device according to an embodiment of the present application is shown.

[0016] Figure 2 A schematic diagram of a microwave transmission section according to an embodiment of the present application is shown.

[0017] Figure 3 A schematic diagram of a microwave transmission section according to an embodiment of the present application is shown.

[0018] Figure 4 A schematic diagram of a microwave transmission end according to an embodiment of the present application is shown.

[0019] Figure 5 A schematic structural diagram of a microwave heating device according to an embodiment of the present application is shown.

[0020] Figure 6 A schematic structural diagram of a microwave heating system according to an embodiment of the present application is shown.

[0021] Figure 7 A schematic diagram of a microwave waveform according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0023] As an exemplary embodiment, Figure 1 FIG. 2 is a schematic diagram showing the structure of a microwave heating device according to an embodiment of the present application. Figure 1 As shown, the microwave heating device includes a microwave transmission line 100 and a microwave feed port (not shown in the figure). The microwave transmission line 100 includes a transmission conductor 10, an auxiliary medium 20 and a transmission ground, the transmission ground is arranged around the transmission conductor 10 to form a shielding shell 40, and the auxiliary medium 20 and the transmission conductor 10 are arranged in the shielding shell 40. The transmission conductor 10 includes a first end 11, and the first end 11 of the transmission conductor 10 passes through the shielding shell 40; the microwave feed port is connected to the first end 11.

[0024] The microwave feed port is used to receive microwave signals; the shielding shell 40 is used to place the object 30 to be heated; and the microwave heating device is used to heat the object 30 to be heated.

[0025] The transmission ground of the microwave transmission line 100 forms a shielding shell 40. The microwave signal connected to the microwave feed port enters the shielding shell 40 and then transmits along the transmission conductor 10. The shielding shell can reduce the leakage of the microwave signal to the outside. In some embodiments, the shielding shell 40 can be a fully enclosed shell or a semi-open shell. In some embodiments, the first end 11 of the transmission conductor 10 passes through the shielding shell 40, and the first end 11 can be exposed on the outer surface of the shielding shell 40, so that the first end 11 can be coupled with the microwave signal source. Exemplarily, the first end 11 can protrude a part relative to the outer surface of the shielding shell 40, or the first end 11 can be flush with the shielding shell 40. The auxiliary medium 20 is used to fill the shielding shell 40 to form a microwave transmission line. The microwave signal is transmitted in the microwave transmission line 100, and the object to be heated 30 is placed in the shielding shell 40. The object to be heated 30 can be regarded as a medium in the microwave transmission line. The microwave energy is converted into heat energy and consumed by the object to be heated 30 and the auxiliary medium 20 during the transmission process to achieve microwave heating.

[0026] The auxiliary medium 20 may include an electrical medium and / or a magnetic medium, and the transmission conductor 10 may include an electrical conductor, such as a metal. The auxiliary medium 20 may also be used to isolate the transmission conductor 10 from the object to be heated 30 to prevent the transmission conductor 10 from directly contacting the object to be heated 30, thereby causing harm to the transmission conductor 10, such as causing the transmission conductor 10 to rust or corrode, or leaving harmful substances on the transmission conductor 10. In some embodiments, the auxiliary medium 20 may include one or more of air, plastic, PCB board, or ceramic.

[0027] As an exemplary embodiment, the loss tangent of the object to be heated 30 is greater than the loss tangent of the auxiliary medium 20, that is, the microwave heating device is used to heat the object to be heated 30 whose loss tangent is greater than the loss tangent of the auxiliary medium 20. Since the loss tangent of the object to be heated 30 is greater than the loss tangent of the auxiliary medium 20, more energy is lost in the highly lossy object to be heated 30, thereby achieving heating of the object to be heated 30.

[0028] Exemplarily, the loss tangent of the auxiliary medium 20 is less than 0.02. The loss tangent of the auxiliary medium 20 is less than 0.02, which can ensure that the loss tangent of the auxiliary medium 20 is less than the loss tangent of most objects with heating requirements, and meet the heating requirements in most current application scenarios. In addition, using 0.02 as the critical value instead of using an excessively small loss tangent value as the critical value can increase the influence of the auxiliary medium 20 on the heating effect and improve the adjustability of the heating effect.

[0029] Exemplarily, the auxiliary medium 20 is air or ceramic. The loss tangent of air is 0.0009, and the loss tangent of ceramic is 0.001. Air or ceramic is a common object with a small loss tangent, which reduces the cost and difficulty of implementing the microwave heating device while ensuring the heating effect.

[0030] As an exemplary embodiment, the embodiment of the present application also provides a microwave heating device for heating an object to be heated. The microwave heating device includes a transmission conductor, a transmission ground and a microwave feed port. The transmission conductor, the transmission ground and the object to be heated form a microwave transmission line. The transmission ground is arranged around the transmission conductor to form a shielding shell, and the transmission conductor is arranged in the shielding shell. The shielding shell is used to place the object to be heated. The transmission conductor includes a first end, and the first end of the transmission conductor passes through the shielding shell. The microwave feed port is connected to the first end. The microwave feed port is used to access a microwave signal. In the embodiment of the present application, the object to be heated can also be used as the medium of the microwave transmission line, and the microwave energy is lost in the object to be heated to achieve heating.

[0031] Based on any of the above embodiments, as an exemplary embodiment, the transmission conductor 10 further includes a second end, the second end is disposed in the shielding shell 40, and an open circuit or a short circuit is configured between the second end and the shielding shell 40. The open circuit may be that the second end is not in direct contact with the shielding shell 40, and the short circuit may be that the second end is in direct contact with the shielding shell 40.

[0032] For example, Figure 1 As shown, the transmission conductor 10 further includes a microwave transmission section 12. The microwave transmission section 12 is disposed in the shielding shell, and the microwave transmission end 12 may be in the shape of a spiral spring.

[0033] like Figures 2 to 4 The microwave transmission section can also be in the shape of a curved line. Alternatively, the microwave transmission section can be bent at multiple locations to form a harpoon shape or a hollow column shape. For example, Figure 4 As shown, the microwave transmission section of the transmission conductor is surrounded to form a columnar structure with an internal cavity. The microwave transmission section can form the columnar structure around a central axis, and the internal cavity can accommodate an object to be heated or an auxiliary medium. Exemplarily, the microwave transmission section can be bent at multiple locations to form the side of the columnar structure.

[0034] The transmission conductor includes one or more bends or spiral shapes in the shielding shell, which can increase the transmission path in a limited space and improve the heating speed and effect.

[0035] As an exemplary implementation, the shielding shell of the embodiment of the present application includes a cover body and a container that cooperates with the cover body, and the first end penetrates the cover body or the container. Figure 5 In the structural schematic diagram of the microwave heating device shown in FIG. 1 , the transmission conductor 10 can be in a straight line shape. The transmission conductor 10 can be fixed above, below or at other positions of the object to be heated 30. The shielding shell 40 formed by the transmission can be a cube as a whole, and a cover is opened above the cube, divided into a cover body 41 and a container 42, so as to facilitate the placement of the object to be heated 30. A small hole can be opened on the cover body 41 or the container 42 to leave a position for the coaxial feeding structure of the transmission conductor 10. The first end of the transmission conductor 10 passes through the cover body or the container and is connected to the microwave feeding port. It should be understood that the shielding shell 40 can also be in other shapes, such as a cylinder, a table or a cone.

[0036] Exemplarily, the auxiliary medium may be a solid medium, and the auxiliary medium is provided with a placement portion for placing the object to be heated. For example, the auxiliary medium may be ceramic, the shielding shell includes a cover body and a container, a transmission conductor is provided at the bottom of the container, the auxiliary medium is provided above the transmission conductor, and the placement portion of the auxiliary medium is used to place the object to be heated. The ceramic medium plays an isolating role. The shape of the placement portion may not be limited, and a variety of structures that are conducive to the placement of objects may be designed to improve practicality.

[0037] Exemplarily, a hole may be provided on the shielding shell, and the diameter of the hole is smaller than the wavelength of the microwave signal connected to the microwave feed port. The embodiment of the present application uses the loss of the microwave transmission line for heating, and a hole may be provided on the shielding shell. Therefore, the microwave heating device of the embodiment of the present application can heat volatile objects and maintain the balance of internal and external air pressure.

[0038] As an exemplary embodiment, Figure 6 The structural schematic diagram of the microwave heating system shown in the figure, the embodiment of the present application also provides a microwave heating system, including a microwave generator 50 and a microwave heating device 60 provided in any embodiment of the present application. The microwave output end of the microwave generator 50 is connected to the microwave feed port of the microwave heating device 60. The number of the microwave generator 50 and the microwave heating device 60 can be one or more respectively. The microwave generator 50 can include a semiconductor microwave generator or an electric vacuum microwave generator.

[0039] Exemplarily, the microwave signal output by the microwave generator 50 is a continuous wave or a pulsed microwave. Pulsed microwaves are discontinuous waves, which can save power consumption in the heating process while maintaining a stable temperature.

[0040] Exemplarily, the microwave generator 50 may include a controller 51. The controller 51 may set one or more of the waveform, frequency, working phase, power and duty cycle of the microwave signal output by the microwave generator. For example, the controller 51 may set the microwave signal output by the microwave generator 50 to be a square wave, a sine wave or a triangle wave, etc. The controller 51 may also set the microwave generator 50 to output a phase-modulated or frequency-modulated microwave signal. A free combination of a variety of waveforms, frequencies, working phases, powers and duty cycles may correspond to a variety of operating modes. The embodiment of the present application provides a microwave generator 50 with adjustable waveform, frequency, working phase, power and duty cycle, which can flexibly adjust the heating effect of the microwave transmission line.

[0041] Exemplarily, the microwave heating system may further include a power supply 70, which is connected to a power supply port of the microwave generator 50 to provide power to the microwave generator 50. The power supply 70 may be a direct current power supply, and may include a battery, a DC-DC power supply, or an AC-DC power supply.

[0042] Exemplarily, the microwave heating system may further include a human-machine interaction unit 80, which is connected to the microwave generator 50. The human-machine interaction unit 80 may include a mouse, a keyboard, a touch screen, or a key system provided on the microwave generator. The human-machine interaction unit 80 is used to receive a control instruction from a user and output a control signal according to the control instruction from the user. The controller 51 of the microwave generator 50 sets the microwave signal output by the microwave generator 50 according to the control signal.

[0043] Exemplarily, the microwave heating system may further include a network module 90, which is used to record the state information and usage information of the microwave heating system, and send the state information and usage information to the server via the network. The state information may include, for example, the temperature of the microwave heating device or the output power of the microwave generator. The usage information may include, for example, the heating target temperature, the heating time, the heating duration, or the heating mode. The network module 90 may be placed inside the microwave generator 50, or outside the microwave generator 50.

[0044] Exemplarily, the microwave heating system may further include a sensor 200. For example, the microwave heating system includes a temperature sensor, which may be disposed in a shielding shell of the microwave heating device, for real-time monitoring of the temperature in the microwave heating device, and for feeding back to a controller, so that the controller adjusts various working properties of the microwave heating device according to the real-time temperature. For example, the microwave heating system includes a power sensor, which is used to detect the transmission power of a microwave generator, and for feeding back to a controller, so that the controller adjusts various working properties of the microwave heating device according to the transmission power.

[0045] Exemplarily, the microwave heating system may further include a microwave signal amplifier (not shown in the figure). The microwave signal amplifier may be arranged between the microwave generator and the microwave feed port of the microwave heating device. The microwave signal amplifier is used to amplify the microwave signal.

[0046] See also Figure 7 , shows the microwave waveform transmitted by the transmission conductor. The microwave energy forms a traveling wave state when it reaches the first end of the transmission conductor. The traveling wave is absorbed by the medium (including the auxiliary medium and / or the object to be heated) during transmission and converted into heat energy. If it is in an open circuit state when it is transmitted to the second end, the traveling wave can be reflected back to form a standing wave or a traveling standing wave.

[0047] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or 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 this application can be understood according to specific circumstances.

[0050] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0052] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A microwave heating device, characterized in that: The invention comprises a microwave transmission line and a microwave feed port, wherein the microwave transmission line comprises a transmission conductor, an auxiliary medium and a transmission ground, wherein the transmission ground is arranged around the transmission conductor to form a shielding shell, and the auxiliary medium and the transmission conductor are arranged in the shielding shell; the transmission conductor comprises a first end, and the first end of the transmission conductor passes through the shielding shell; The microwave feeding port is connected to the first end; The microwave feeding port is used to access microwave signals; The shielding shell is used to place the object to be heated; The microwave heating device is used to heat the object to be heated; Wherein, the auxiliary medium includes a dielectric and / or a magnetic medium, and the transmission conductor includes an electrical conductor; the auxiliary medium is also used to isolate the transmission conductor and the object to be heated; and the loss tangent of the object to be heated is greater than the loss tangent of the auxiliary medium.

2. The microwave heating device according to claim 1, characterized in that: The loss tangent of the auxiliary medium is less than 0.

02.

3. The microwave heating device according to claim 1, characterized in that: The auxiliary medium is air or ceramic.

4. The microwave heating device according to any one of claims 1 to 3, characterized in that: The transmission conductor further includes a second end, the second end is arranged in the shielding shell, and the second end and the shielding shell are open-circuited or short-circuited.

5. The microwave heating device according to any one of claims 1 to 3, characterized in that: The transmission conductor also includes a microwave transmission section, which is arranged in the shielding shell and is in the shape of a bending line, a spiral spring, a harpoon or a hollow column.

6. The microwave heating device according to any one of claims 1 to 3, characterized in that: The shielding shell includes a cover body and a container that cooperates with the cover body, and the first end passes through the cover body or the container.

7. The microwave heating device according to claim 1 or 2, characterized in that: The auxiliary medium is a solid medium, and the auxiliary medium is provided with a placement portion for placing an object to be heated.

8. The microwave heating device according to any one of claims 1 to 3, characterized in that: The shielding shell is provided with a hole, and the diameter of the hole is smaller than the wavelength of the microwave signal connected to the microwave feeding port.

9. A microwave heating device, characterized in that: The microwave heating device is used to heat an object to be heated; the microwave heating device comprises a transmission conductor, a transmission ground and a microwave feeding port; the transmission conductor, the transmission ground and the object to be heated form a microwave transmission line; The transmission ground is arranged around the transmission conductor to form a shielding shell, and the transmission conductor is arranged in the shielding shell; the shielding shell is used to place the object to be heated; The transmission conductor comprises a first end, and the first end of the transmission conductor passes through the shielding shell; The microwave feeding port is connected to the first end; the microwave feeding port is used to access the microwave signal; Wherein, the microwave heating device also includes an auxiliary medium, the auxiliary medium includes an electrical dielectric and / or a magnetic medium, and the transmission conductor includes an electrical conductor; the auxiliary medium is used to isolate the transmission conductor and the object to be heated; the loss tangent of the object to be heated is greater than the loss tangent of the auxiliary medium.

10. A microwave heating system, characterized in that: It comprises a microwave generator and the microwave heating device according to any one of claims 1 to 9; the microwave output end of the microwave generator is connected to the microwave feeding port of the microwave heating device.

11. The microwave heating system according to claim 10, characterized in that: The microwave signal output by the microwave generator is a pulse microwave.

12. The microwave heating system according to claim 11, characterized in that: The microwave generator comprises a controller; the controller is used to set one or more of the waveform, frequency, working phase, power and duty cycle of the microwave signal output by the microwave generator.

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