Microwave reaction equipment

Abstract

The utility model discloses microwave reaction equipment, which comprises a microwave feed-in assembly, a microwave transmitting container, a first waveguide tube and a microwave generator, the microwave feed-in assembly is provided with a microwave feed-in cavity, and an opening is formed in the microwave feed-in assembly and is positioned at the top of the microwave feed-in cavity; the microwave-transmitting container is installed in the microwave feed-in assembly, the outer wall of the microwave-transmitting container is connected with the inner wall of the microwave feed-in assembly in an attached mode, and the microwave-transmitting container is used for containing a microwave absorbing medium; the first end of the first waveguide tube is connected with the microwave feed-in assembly; the microwave generator is connected with the second end of the first waveguide tube, and the microwave generator is used for generating microwaves and conducting the microwaves to the microwave feed-in cavity through the first waveguide tube, so that the microwave absorption medium absorbs the microwaves for heating. According to the utility model, the microwave absorption medium can be heated through the fully-open cavity, the space and shape limitation of a traditional microwave closed resonant cavity is broken through, the type limitation of a target object is relieved, and the heating uniformity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory heating equipment, in particular to a microwave reaction device. Background Art

[0002] The heating methods of laboratory heating equipment mainly include two types: electric heating and microwave heating. The electric heating method has high energy consumption and it is difficult to achieve uniform heating for a large heating area. The microwave heating method is based on the principle that the target object itself absorbs microwaves and then quickly heats itself. However, it requires the target object to be able to absorb microwaves, and there is no heating effect on substances that cannot absorb microwaves. Moreover, it requires a closed cavity to form a microwave resonance cavity, which has restrictions on the volume and shape of the target object. In addition, the uniformity of microwave absorption is uncontrollable. When multiple target objects are heated simultaneously in a microwave field, uneven heating occurs due to different degrees of microwave energy absorption. In addition, due to the interference of microwaves on electronic components, it has always been a difficult point to control the temperature of the target object during the heating process in a traditional microwave cavity. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a microwave reaction device, which can heat a microwave absorption medium through an all - open cavity, break through the space and shape limitations of the traditional microwave closed resonance cavity, lift the restrictions on the types of target objects, and improve the heating uniformity.

[0004] On the one hand, an embodiment of the utility model provides a microwave reaction device, including:

[0005] A microwave feeding component, provided with a microwave feeding cavity, and an opening is formed at the top of the microwave feeding cavity on the microwave feeding component;

[0006] A microwave - permeable container, installed in the microwave feeding component, and the outer wall of the microwave - permeable container is in close - fitting connection with the inner wall of the microwave feeding component. The microwave - permeable container is used to accommodate a microwave absorption medium;

[0007] A first waveguide, installed at the bottom of the microwave feeding component, and the first end of the first waveguide is connected to the microwave feeding component;

[0008] A microwave generator, connected to the second end of the first waveguide. The microwave generator is used to generate microwaves and conduct the microwaves to the microwave feeding cavity through the first waveguide, so that the microwave absorption medium absorbs the microwaves and heats up.

[0009] On the other hand, an embodiment of the utility model also provides a microwave reaction device, including:

[0010] A microwave feeding component is provided with a microwave feeding cavity. An opening is formed at the top of the microwave feeding cavity on the microwave feeding component. The microwave feeding component is provided with a microwave-permeable sealing plate, and the microwave feeding cavity is used for accommodating a microwave absorption medium;

[0011] A first waveguide is installed at the bottom of the microwave feeding component. The first end of the first waveguide is connected to the microwave feeding component, and the connection position is adapted to the position of the microwave-permeable sealing plate;

[0012] A microwave generator is connected to the second end of the first waveguide. The microwave generator is used for generating microwaves and conducting the microwaves to the microwave feeding cavity through the first waveguide, so that the microwave absorption medium absorbs the microwaves to be heated.

[0013] According to some embodiments of the present invention, the microwave reaction device further includes a stirring component, and the stirring component is used for stirring the microwave absorption medium.

[0014] According to some embodiments of the present invention, the stirring component adopts a magnetic stirrer. The magnetic stirrer includes a magnetically connected magnetic driving part and a magnetic stirring bead. The magnetic driving part is installed outside the microwave feeding component, and the magnetic stirring bead is in contact with the microwave absorption medium.

[0015] According to some embodiments of the present invention, the microwave reaction device further includes a temperature sensor, and the temperature sensor is used for detecting the temperature of the microwave absorption medium.

[0016] According to some embodiments of the present invention, the temperature sensor adopts a contact type temperature sensor or a non-contact type temperature sensor.

[0017] According to some embodiments of the present invention, the microwave feeding component is a metal shell, and the metal shell has a side plate and a bottom plate. The side plate is continuous and closed, the side plate is connected to the bottom plate, and a microwave feeding port communicating with the first waveguide is arranged on the bottom plate.

[0018] According to some embodiments of the present invention, a microwave feeding port is arranged on the microwave feeding component, and the microwave-permeable sealing plate is installed at the microwave feeding port.

[0019] According to some embodiments of the present invention, the microwave absorption medium is a mixture of water and silicon nitride beads, or the microwave absorption medium is an ionic liquid.

[0020] According to some embodiments of the present invention, a second waveguide and a feeding antenna are further arranged between the first waveguide and the microwave feeding component, and the second waveguide is of a rectangular waveguide structure.

[0021] The embodiments of the present utility model at least have the following beneficial effects:

[0022] The fully open structure of the microwave feeding cavity breaks through the spatial and shape limitations of the traditional microwave closed resonant cavity. The microwave generated by the microwave generator is conducted to the microwave feeding cavity through the first waveguide, so that the microwave absorption medium absorbs the microwave for heating, and then the heat is conducted to the target object through the microwave absorption medium, which is beneficial to lifting the limitation on the type of the target object and improving the heating uniformity.

[0023] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0024] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0025] Figure 1 is a schematic structural diagram of the microwave reaction device according to Embodiment 1 of the present utility model;

[0026] Figure 2 is a schematic cross-sectional structural diagram of the microwave reaction device according to Embodiment 1 of the present utility model;

[0027] Figure 3 is a schematic structural diagram of the microwave reaction device according to Embodiment 2 of the present utility model;

[0028] Figure 4 is a schematic cross-sectional structural diagram of the microwave reaction device according to Embodiment 2 of the present utility model.

[0029] Reference Signs:

[0030] Microwave feeding assembly 100, microwave feeding cavity 101, opening 102, microwave feeding port 103, side plate 110, bottom plate 120, microwave-transparent container 210, microwave-transparent sealing plate 220, microwave absorption medium 230, first waveguide 300, microwave generator 400, stirring assembly 500, temperature sensor 600. Detailed Description of the Embodiments

[0031] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more. Understanding greater than, less than, exceeding, etc. does not include the original number, and understanding "above", "below", "within", etc. includes the original number. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0035] The principle of a microwave resonator is based on the resonance phenomenon, that is, when the frequency of the microwave signal is equal to the natural frequency of the cavity, the energy is maximally transmitted and stored inside the cavity. A microwave resonator usually uses a metal cavity. The smooth metal wall inside the microwave resonator can reflect the microwave signal, causing the microwave signal to propagate back and forth inside the microwave resonator, forming a standing wave. When the wavelength of the microwave signal is an integer multiple of the cavity length, the standing wave reaches its maximum value, which is the resonance phenomenon. The natural frequency of the microwave resonator depends on the geometric shape and size of the cavity, and is usually represented by the number of the resonance mode. Common resonance modes include rectangular cavities, cylindrical cavities, and spherical cavities, etc. Different resonance modes have different field distribution and energy distribution characteristics, and the appropriate resonance mode needs to be selected according to specific requirements. During the design process, the design of the microwave resonator is to meet specific operating frequencies and resonance modes. When designing, the geometric shape and size of the resonance cavity are mainly considered. The shape and size of the cavity directly affect the natural frequency and resonance mode of the resonator. In addition, in addition to resonating microwave signals, the microwave resonator is also used for microwave shielding, that is, preventing microwave signals from leaking outside the microwave resonator. In other words, traditional microwave heating structures usually have a metal cavity. The design purposes of the metal cavity are mainly divided into two types. One is mainly for microwave resonance and secondarily for microwave shielding, and the other is mainly for microwave shielding and secondarily for microwave resonance. Therefore, the traditional microwave heating method is restricted by the structure and size of the microwave resonator, resulting in restrictions on the volume and shape of the target object. Embodiment 1

[0036] Please refer to Figure 1 and Figure 2 In this embodiment, a microwave reaction device is disclosed, which includes a microwave feeding component 100, a microwave-transparent container 210, a first waveguide 300, and a microwave generator 400. The microwave feeding component 100 is provided with a microwave feeding cavity 101. An opening 102 is formed at the top of the microwave feeding component 100 and located on the top of the microwave feeding cavity 101. That is to say, the top of the microwave feeding cavity 101 is in an open state (i.e., not closed). The microwave-transparent container 210 is installed in the microwave feeding component 100, and the outer wall of the microwave-transparent container 210 is attached to the inner wall of the microwave feeding component 100. That is, the connection gap between the microwave-transparent container 210 and the microwave feeding component 100 is small. The size of the microwave-transparent container 210 is equal to or almost equal to the size of the microwave feeding cavity 101. The microwave-transparent container 210 is used to accommodate a microwave absorbing medium 230. The first end of the first waveguide 300 is connected to the microwave feeding component 100, and the connection position of the first waveguide 300 is adapted to the position of the microwave-transparent container 210. The microwave generator 400 is connected to the second end of the first waveguide 300. The microwave generator 400 is used to generate microwaves and conduct the microwaves to the microwave feeding cavity 101 through the first waveguide 300, so that the microwave absorbing medium 230 absorbs the microwaves and heats up.

[0037] During use, the microwave generator 400 (such as a magnetron) generates microwaves and conducts the microwaves into the microwave feeding cavity 101 through the first waveguide 300. Since the outer wall of the microwave-transparent container 210 is attached to the inner wall of the microwave feeding component 100, and the microwave absorbing medium 230 (usually in a liquid state) is accommodated in the microwave-transparent container 210, after the microwaves enter the microwave feeding cavity 101, they pass through the microwave-transparent container 210 and are absorbed by the microwave absorbing medium 230, and the microwave absorbing medium 230 heats up. At this time, the target object can be placed in the microwave-transparent container 210, and the target object is heated by the microwave absorbing medium 230, which is beneficial to improving the heating uniformity of the target object. Moreover, the target object does not need to be limited to having microwave absorption ability, and various types of target objects can be heated through the heat transfer of the microwave absorbing medium 230, or the target object and the microwave absorbing medium 230 are connected through a heat conducting member, so that the heat of the microwave absorbing medium 230 is transferred to the target object through the heat conducting member, thereby heating the target object.

[0038] It is worth mentioning that the connection position of the first waveguide 300 can be the bottom of the microwave feeding component 100 or the side wall of the microwave feeding component 100, and the top surface of the microwave-permeable container 210 can be lower than the top edge of the microwave feeding component 100, or the top surface of the microwave-permeable container 210 can be flush with the top edge of the microwave feeding component 100, or the top surface of the microwave-permeable container 210 can be higher than the top edge of the microwave feeding component 100.

[0039] Generally speaking, the microwave feeding component 100 has a flat cuboid structure. It should be noted that the shape of the microwave feeding component 100 is not limited to the cuboid structure and can also be a disc-shaped structure or a columnar structure, etc. The first waveguide 300 is installed at the bottom of the microwave feeding component 100, and the first waveguide 300 is connected to the bottom of the microwave feeding component 100. Microwaves are fed into the microwave feeding cavity 101 from the bottom of the microwave feeding component 100. The microwave absorbing medium 230 can completely cover the connection position of the first waveguide 300 (i.e., the microwave feeding port 103), which is convenient for absorbing microwave energy and is beneficial to improving the uniformity of microwave absorption, thereby improving the uniformity of temperature rise. When the connection position of the first waveguide 300 is located on the side wall of the microwave feeding component 100, the liquid level of the microwave absorbing medium 230 should be higher than the corresponding microwave feeding port 103 of the first waveguide 300, so that the microwaves can be absorbed by the microwave absorbing medium 230 after entering the microwave feeding cavity 101.

[0040] When microwaves are fed, the microwave energy is immediately absorbed by the microwave absorbing medium 230 and converted into heat energy, and the temperature of the microwave absorbing medium 230 rises rapidly. When the liquid level height of the microwave absorbing medium 230 exceeds a certain value, the microwave absorbing medium 230 can absorb most of the fed microwaves. According to the national general microwave equipment leakage detection standard, the measured microwave leakage < 1mW / cm 2 is much lower than the national standard of 5mW / cm 2 . In other words, the microwave absorbing medium 230 almost completely absorbs the microwaves fed into the microwave feeding cavity 101. There is no need to design a resonant cavity to resonate the microwaves, nor is it necessary to prevent microwave leakage. An opening 102 can be provided on the microwave feeding component 100 to achieve a fully open structural design, reducing the restrictions on the volume and shape of the target object. According to the actual application requirements, the target object can be placed into the microwave-permeable container 210 through the opening 102 of the microwave feeding component 100 for heating.

[0041] The fully open structure of the microwave feeding cavity 101 breaks through the spatial and shape limitations of traditional microwave closed resonators. The microwave generated by the microwave generator 400 is conducted to the microwave feeding cavity 101 through the first waveguide 300, so that the microwave absorbing medium 230 absorbs the microwave for heating up, and then conducts the heat to the target through the microwave absorbing medium 230, which is beneficial to lifting the species limitation of the target and improving the heating uniformity.

[0042] Please continue to refer to Figure 1 and Figure 2 For the application scenarios where the size of the microwave feeding cavity 101 is relatively large, the microwave reaction device further includes a stirring assembly 500. The stirring assembly 500 is used to stir the microwave absorbing medium 230, which can further improve the uniformity of the microwave absorption of the microwave absorbing medium 230, and thus improve the temperature rise uniformity of the microwave absorbing medium 230. In some application examples, the stirring assembly 500 adopts an ordinary stirring motor, and the stirring motor can extend into the microwave-transparent container 210 from the opening 102 of the microwave feeding assembly 100. In other application examples, the stirring assembly 500 adopts a magnetic stirrer, which includes a magnetically connected magnetic driving part and a magnetic stirring bar. The magnetic driving part is installed outside the microwave feeding assembly 100, and the magnetic stirring bar contacts the microwave absorbing medium 230. During use, the magnetic stirring bar is placed in the microwave-transparent container 210 and immersed in the microwave absorbing medium 230. The magnetic driving part drives the magnetic stirring bar through a magnetic field to uniformly stir the microwave absorbing medium 230. The non-direct contact between the magnetic driving part and the magnetic stirring bar is beneficial to avoiding opening holes in the microwave feeding assembly 100 and reducing microwave leakage.

[0043] The microwave reaction device further includes a temperature sensor 600, which is used to detect the temperature of the microwave absorbing medium 230. By detecting the temperature of the microwave absorbing medium 230 with the temperature sensor 600, feedback control is performed on the microwave generator 400 to adjust the temperature of the microwave absorbing medium 230 in real time and accurately, so as to improve the accurate control of the heating temperature of the target. Among them, the temperature sensor 600 adopts a contact type temperature sensor, such as a platinum resistance or a thermocouple temperature measuring probe. Most of the microwaves fed into the microwave feeding cavity 101 are absorbed by the microwave absorbing medium 230 and will not interfere with the contact type temperature sensor. Moreover, the cost of the platinum resistance is low, which is beneficial to reducing the cost of the microwave reaction device. In addition, the temperature sensor 600 can adopt a non-contact type temperature sensor, such as an infrared temperature measuring sensor.

[0044] Please refer to Figure 2, the microwave feeding component 100 is a metal housing, which has a side plate 110 and a bottom plate 120. The side plate 110 is continuous and closed, the side plate 110 is connected to the bottom plate 120, and a microwave feeding port 103 communicating with the first waveguide 300 is provided on the bottom plate 120. For example, the side plate 110 of the metal housing is a frame structure formed by connecting 4 sheet metal plates end to end. From the top-down projection view, the side plate 110 is continuous and closed, and the fed microwave can be restricted within the microwave feeding cavity 101. Also for example, the side plate 110 of the metal housing is a frame structure formed by a circular metal plate connected end to end. From the top-down projection view, the side plate 110 is continuous and closed, and the propagation direction of the microwave can be restricted. The microwave feeding port 103 opened on the bottom plate 120 allows the microwave fed by the first waveguide 300 to enter the microwave feeding cavity, and thus be absorbed by the microwave absorbing medium 230.

[0045] In order to improve the utilization rate of the microwave and reduce the leakage of the microwave, the microwave absorbing medium 230 should have a strong microwave absorption ability. Generally speaking, the microwave absorbing medium 230 is a liquid, which can be evenly accommodated in the microwave-permeable container 210, so as to completely cover the microwave feeding port 103 and reduce the leakage of the microwave. For application scenarios with a heating temperature below 90°C, the microwave absorbing medium 230 is a mixture of water and silicon nitride beads. If a heating temperature exceeding 90°C is required, the microwave absorbing medium 230 should meet the following characteristics: strong absorption of microwaves, boiling point exceeding 300°C, vapor pressure close to zero within the boiling point temperature, and no corrosion. Exemplarily, the microwave absorbing medium 230 is an ionic liquid, which can meet the application requirements with a heating temperature exceeding 90°C.

[0046] The waveguide is also called an excitation cavity, and its main function is the setting of microwave introduction and amplification. If the microwave is introduced in the form of an antenna, a second waveguide and a feeding antenna are also provided between the first waveguide 300 and the microwave feeding component 100, and the second waveguide is a rectangular waveguide structure. Embodiment 2

[0047] Please refer to Figure 3 and Figure 4, this embodiment provides a microwave reaction device, including a microwave feeding component 100, a first waveguide 300, and a microwave generator 400. The microwave feeding component 100 is provided with a microwave feeding cavity 101. An opening 102 is formed at the top of the microwave feeding component 100 and located on the top of the microwave feeding cavity 101. That is to say, the top of the microwave feeding cavity 101 is in an open state (i.e., not closed). The microwave feeding component 100 is provided with a microwave-passing sealing plate 220, such as a plastic plate or a glass plate, etc. The microwave feeding cavity 101 is used to accommodate a microwave absorption medium 230. The first end of the first waveguide 300 is connected to the microwave feeding component 100, and the connection position is adapted to the position of the microwave-passing sealing plate 220. The microwave generator 400 is connected to the second end of the first waveguide 300. The microwave generator 400 is used to generate microwaves and conduct the microwaves to the microwave feeding cavity 101 through the first waveguide 300, so that the microwave absorption medium 230 absorbs the microwaves and heats up.

[0048] The utility model concept of this embodiment is the same as that of Embodiment 1. For the content not involved in this embodiment, reference can be made to Embodiment 1. Different from Embodiment 1, this embodiment omits the microwave-passing container 210, and seals the connection position between the first waveguide 300 and the microwave feeding component 100 through the microwave-passing sealing plate 220. It can not only allow microwaves to pass through the microwave-passing sealing plate 220 and enter the microwave feeding cavity 101, but also prevent the microwave absorption medium 230 accommodated in the microwave feeding component 100 from leaking. The same as in Embodiment 1, the connection position of the first waveguide 300 can be the bottom of the microwave feeding component 100 or the side wall of the microwave feeding component 100.

[0049] During use, the microwave generator 400 (such as a magnetron) generates microwaves and conducts the microwaves into the microwave feeding cavity 101 through the first waveguide 300. A microwave absorption medium 230 (usually in liquid state) with a predetermined depth is accommodated in the microwave feeding component 100. After the microwaves enter the microwave feeding cavity 101, they are absorbed by the microwave absorption medium 230, and the microwave absorption medium 230 heats up. At this time, the target object can be placed in the microwave feeding component 100, and the target object is heated through the microwave absorption medium 230, which is beneficial to improving the heating uniformity of the target object. Moreover, the target object does not need to be limited to having microwave absorption ability, and various types of target objects can be heated through the heat transfer of the microwave absorption medium 230, or the target object and the microwave absorption medium 230 are connected through a heat conducting member, so that the heat of the microwave absorption medium 230 is transferred to the target object through the heat conducting member, thereby heating the target object.

[0050] The fully open structure of the microwave feeding cavity 101 breaks through the spatial and shape limitations of traditional microwave closed resonators. The microwave generated by the microwave generator 400 is conducted to the microwave feeding cavity 101 through the first waveguide 300, so that the microwave absorbing medium 230 absorbs the microwave for heating up, and then conducts the heat to the target object through the microwave absorbing medium 230. This is beneficial to lifting the species limitation of the target object and improving the heating uniformity. According to actual application requirements, the target object can be placed into the microwave feeding assembly 100 through the opening 102 of the microwave feeding assembly 100 for heating.

[0051] Please continue to refer to Figure 3 and Figure 4 For application scenarios where the size of the microwave feeding cavity 101 is relatively large, the microwave reaction device further includes a stirring assembly 500. The stirring assembly 500 is used to stir the microwave absorbing medium 230, which can further improve the uniformity of the microwave absorption by the microwave absorbing medium 230, and thus improve the temperature rise uniformity of the microwave absorbing medium 230. In some application examples, the stirring assembly 500 uses an ordinary stirring motor, and the stirring motor can extend into the microwave absorbing medium 230 from the opening 102 of the microwave feeding assembly 100. In other application examples, the stirring assembly 500 uses a magnetic stirrer, which includes a magnetically connected magnetic driving part and a magnetic stirring bar. The magnetic driving part is installed outside the microwave feeding assembly 100, and the magnetic stirring bar contacts the microwave absorbing medium 230. During use, the magnetic stirring bar is placed in the microwave feeding assembly 100 and immersed in the microwave absorbing medium 230, and the magnetic driving part drives the magnetic stirring bar through the magnetic field to uniformly stir the microwave absorbing medium 230. The non-direct contact between the magnetic driving part and the magnetic stirring bar is beneficial to avoiding opening holes on the microwave feeding assembly 100 and reducing microwave leakage.

[0052] The microwave reaction device further includes a temperature sensor 600, which is used to detect the temperature of the microwave absorbing medium 230. By detecting the temperature of the microwave absorbing medium 230 through the temperature sensor 600, feedback control is performed on the microwave generator 400 to adjust the temperature of the microwave absorbing medium 230 in real time and accurately, thereby improving the accurate control of the heating temperature of the target object. Among them, the temperature sensor 600 uses a contact type temperature sensor, such as a platinum resistance or a thermocouple temperature measuring probe. Most of the microwaves fed into the microwave feeding cavity 101 are absorbed by the microwave absorbing medium 230 and will not interfere with the contact type temperature sensor. Moreover, the cost of the platinum resistance is low, which is beneficial to reducing the cost of the microwave reaction device. In addition, the temperature sensor 600 can use a non-contact type temperature sensor, such as an infrared temperature measuring sensor.

[0053] Please refer to Figure 4, the microwave feeding component 100 is a metal housing, which has a side plate 110 and a bottom plate 120. The side plate 110 is continuous and closed. The side plate 110 is connected to the bottom plate 120. A microwave feeding port 103 communicating with the first waveguide 300 is provided on the bottom plate 120. For example, the side plate 110 of the metal housing is a frame structure formed by connecting 4 sheet metal plates end to end. From the top view projection view, the side plate 110 is continuous and closed, and the fed microwave can be restricted within the microwave feeding cavity 101. Also for example, the side plate 110 of the metal housing is a frame structure formed by a circular metal plate connected end to end. From the top view projection view, the side plate 110 is continuous and closed. The microwave feeding port 103 opened on the bottom plate 120 can enable the microwave fed by the first waveguide 300 to enter the microwave feeding cavity, and thus be absorbed by the microwave absorbing medium 230. In this way, the microwave feeding component 100 is provided with the microwave feeding port 103, and the microwave-transparent sealing plate 220 is installed at the microwave feeding port 103, so as to seal the microwave feeding port 103 and prevent the microwave absorbing medium 230 from leaking into the first waveguide 300.

[0054] In order to improve the utilization rate of microwave and reduce the leakage of microwave, the microwave absorbing medium 230 should have a strong microwave absorption ability. Generally speaking, the microwave absorbing medium 230 is a liquid, which can be evenly accommodated in the microwave feeding component 100, so as to completely cover the microwave feeding port 103 and reduce the leakage of microwave. For application scenarios with a heating temperature below 90 °C, the microwave absorbing medium 230 is a mixture of water and silicon nitride beads. If a heating temperature exceeding 90 °C is required, the microwave absorbing medium 230 should meet the following characteristics: strong absorption of microwave, boiling point exceeding 300 °C, vapor pressure approaching zero within the boiling point temperature, and no corrosion. Exemplarily, the microwave absorbing medium 230 is an ionic liquid, which can meet the application requirements with a heating temperature exceeding 90 °C.

[0055] The waveguide is also called an excitation cavity, and its main function is to set the introduction and amplification of microwave. If the microwave is introduced in the form of an antenna, a second waveguide and a feeding antenna are also provided between the first waveguide 300 and the microwave feeding component 100, and the second waveguide is a rectangular waveguide structure.

[0056] The following is a comparison between a conventional electric heating instrument and the microwave reaction equipment of the above embodiment through examples to reflect the advantages of the microwave reaction equipment:

[0057] Conventional electric heating instrument: The area of the heating block is 250 mm × 250 mm, the heating tubes are 500 W × 4 pieces, the input power is 2200 W, the target object is heated to 180 °C, and it takes 20 - 30 minutes. The surface temperature at the four corners of the heating block differs from the surface temperature at the middle position by about 5 °C.

[0058] Microwave reaction equipment: The size of the microwave feeding cavity 101 is 250 mm × 170 mm. The microwave generator 400 uses a single magnetron to feed microwaves with an input power of 800 W. The microwave absorption medium 230 uses 1000 mL of ionic liquid to heat the target to 180 °C within no more than 10 minutes, and the temperature difference at each position point does not exceed 1.5 °C.

[0059] It can be seen from the comparison results that the microwave absorption medium 230-assisted heating technology requires less time, less energy consumption, and more uniform temperature compared with conventional electric heating to reach the same temperature.

[0060] In addition, containers made of different materials and shapes can be used to hold target substances with different components and placed in the microwave absorption medium 230 for uniform heating, which is not affected by the container shape and the type of target substance components.

[0061] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present utility model within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A microwave reaction device, characterized in that, Comprising: A microwave feeding component (100) is provided with a microwave feeding cavity (101), and an opening (102) is formed at the top of the microwave feeding component (100) and located on the microwave feeding cavity (101); A microwave-transparent container (210) is installed inside the microwave feeding component (100), and the outer wall of the microwave-transparent container (210) is fitted and connected to the inner wall of the microwave feeding component (100). The microwave-transparent container (210) is used to accommodate a microwave absorption medium (230); A first waveguide (300) is installed at the bottom of the microwave feeding component (100), and the first end of the first waveguide (300) is connected to the bottom of the microwave feeding component (100); A microwave generator (400) is connected to the second end of the first waveguide (300). The microwave generator (400) is used to generate microwaves and conduct the microwaves to the microwave feeding cavity (101) through the first waveguide (300), so that the microwave absorption medium (230) absorbs the microwaves for heating up.

2. A microwave reaction device, characterized in that, Comprising: A microwave feeding component (100) is provided with a microwave feeding cavity (101), and an opening (102) is formed at the top of the microwave feeding component (100) and located on the microwave feeding cavity (101). The microwave feeding component (100) is provided with a microwave-transparent sealing plate (220), and the microwave feeding cavity (101) is used to accommodate a microwave absorption medium (230); A first waveguide (300) is installed at the bottom of the microwave feeding component (100). The first end of the first waveguide (300) is connected to the bottom of the microwave feeding component (100), and the connection position is adapted to the position of the microwave-transparent sealing plate (220); A microwave generator (400) is connected to the second end of the first waveguide (300). The microwave generator (400) is used to generate microwaves and conduct the microwaves to the microwave feeding cavity (101) through the first waveguide (300), so that the microwave absorption medium (230) absorbs the microwaves for heating up.

3. The microwave reaction device according to claim 1 or 2, characterized in that, The microwave reaction device further includes a stirring component (500), and the stirring component (500) is used to stir the microwave absorption medium (230).

4. The microwave reaction device according to claim 3, wherein The stirring component (500) adopts a magnetic stirrer, and the magnetic stirrer includes a magnetically connected magnetic driving part and a magnetic stirring bar. The magnetic driving part is installed outside the microwave feeding component (100), and the magnetic stirring bar is in contact with the microwave absorption medium (230).

5. The microwave reaction device according to claim 1 or 2, characterized in that, The microwave reaction device further includes a temperature sensor (600), and the temperature sensor (600) is used to detect the temperature of the microwave absorption medium (230).

6. The microwave reaction device according to claim 5, characterized in that, The temperature sensor (600) adopts a contact type temperature sensor or a non-contact type temperature sensor.

7. The microwave reaction device according to claim 1 or 2, characterized in that, The microwave feeding component (100) is a metal housing, the metal housing has a side plate (110) and a bottom plate (120), the side plate (110) is continuous and closed, the side plate (110) is connected to the bottom plate (120), and a microwave feeding port (103) is provided on the bottom plate (120).

8. The microwave reaction device according to claim 2, wherein, A microwave feeding port (103) is provided on the microwave feeding component (100), and the microwave-transparent sealing plate (220) is installed at the microwave feeding port (103).

9. The microwave reaction device according to claim 1, 2, 4, 6 or 8, characterized in that, The microwave absorbing medium (230) is a mixture of water and silicon nitride beads, or the microwave absorbing medium (230) is an ionic liquid.

10. The microwave reaction device according to claim 1, 2, 4, 6 or 8, characterized in that, A second waveguide and a feeding antenna are further provided between the first waveguide (300) and the microwave feeding component (100), and the second waveguide is of a rectangular waveguide structure.

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