Liquid microwave heating device

Abstract

To heat a liquid evenly.SOLUTION: A liquid microwave heating device features a connecting duct that curves upward, a diffuser (50) with a gradually increasing inner diameter, and multiple regulating sheets on its inner wall. The heating chamber (70) includes an outer vessel, a regulating bottom plate, and an inner vessel. The outer vessel has a bottom opening, an external gas outlet, and an external liquid inlet. The outer vessel is connected to the diffuser at its bottom opening, and the regulating bottom plate is attached to the outer vessel to seal the bottom opening. The inner vessel is installed within the outer vessel and has an internal gas outlet and internal liquid inlet, the internal gas outlet communicating with the external gas outlet and the internal liquid inlet communicating with the external liquid inlet. The diffuser enlarges the microwave field with uniform intensity, and microwaves are incident on the regulating bottom plate from the bottom of the outer vessel to irradiate the liquid to be heated from bottom to top. During heating, the boiling liquid vaporizes and naturally rises, expelling it from the upper gas outlet.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heating device, and particularly to a microwave heating device for liquids.

Background Art

[0002] Conventionally, when heating a corrosive liquid, for example, an indirect heating method such as boiling and distilling concentrated sulfuric acid at 1 atmosphere has generally been adopted. However, indirect heating requires a great deal of time and energy, so when used in the manufacturing process, the overall working efficiency deteriorates. Therefore, conventionally, microwave heating has also been used as another heating method. As shown in FIGS. 5 and 6, a microwave heating device has a specific structure including a microwave oscillator 90, a circulator 91, a stub tuner (impedance regulator) 92, a heating chamber 93, and an adjustment plunger 94 that are sequentially connected to each other. Among them, the microwave oscillator 90 generates microwaves, and the circulator 91 protects the microwave source, that is, when microwaves are reflected from the rear end and return, it provides a protection function. In addition, the heating chamber 93 is provided with a reaction tube 95 perpendicular to the traveling direction of the microwaves through which the liquid to be heated passes. The stub tuner 92 and the adjustment plunger 94 perform matching adjustment of the microwaves with respect to the heating chamber 93 to ensure that the liquid to be heated is well heated by the microwaves when passing through the heating chamber 93.

[0003] However, when the temperature of the liquid rises and reaches the boiling point, the volume rapidly expands. Therefore, when heating the liquid using the above-described configuration, the liquid in the microwave irradiation region in the heating chamber 93 is constantly vaporized, expanded, and discharged. As a result, since the liquid originally in the microwave irradiation region is pushed out by the gas, the liquid is not efficiently heated, or boils too much, resulting in a decrease in heating efficiency and inability to achieve stable heating. Therefore, in the conventional microwave heating device for liquids, there are problems and defects as described above in the overall configuration, so it needs to be improved.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made in view of the drawbacks of the prior art, and by installing an expansion tube, it expands the microwave field to a uniform intensity, and by making the microwave incident on the adjustment bottom plate from the bottom of the outer tank, it irradiates the liquid to be heated uniformly from bottom to top. An object of the present invention is to provide a microwave heating device for a liquid.

Means for Solving the Problems

[0006] In order to achieve the above object, the present invention proposes a microwave heating device for a liquid as follows. That is, the microwave heating device for the liquid includes a microwave oscillator, a circulator having one end connected to the microwave oscillator, a stub tuner having one end connected to the other end of the circulator, a connecting duct having a bent portion and a connecting portion, one end of the bent portion being connected and communicating with one end of the connecting portion, the other end of the bent portion being connected to the other end of the stub tuner, and the other end of the connecting portion extending upward, an expansion tube having a narrow end and a wide end, the inner diameter gradually increasing from the narrow end to the wide end, the narrow end being connected to the connecting portion of the connecting duct, and a plurality of adjustment sheets each containing a dielectric material being provided on the inner wall of the wide end, A heating chamber having an outer tank, an adjustment bottom plate, and an inner tank, wherein the outer tank is formed with an enclosed internal space, a bottom opening communicating with the internal space, an external gas discharge port, and an external liquid injection port, the outer tank is connected to the wide end of the expansion pipe at the position of the bottom opening, the adjustment bottom plate contains a dielectric material and is installed in the internal space of the outer tank to seal the bottom opening, the inner tank is formed with an enclosed storage space, an internal gas discharge port and an internal liquid injection port communicating with the storage space, the inner tank is installed in the outer tank, the internal gas discharge port communicates with the external gas discharge port, and the internal liquid injection port communicates with the external liquid injection port, a heating chamber; including.

[0007] Also, in the microwave heating device for the liquid, it further includes a support body provided with a rectangular through hole. An annular protrusion projects from the opening edge adjacent to the wide end of the expansion pipe, and the support body fixes the annular protrusion so that the annular protrusion is fitted into the through hole.

[0008] Also, in the microwave heating device for the liquid, a plurality of convex portions are formed inside the connecting portion, each of the convex portions is arranged at intervals and protrudes around the inner wall surface of the connecting portion, and the inner diameter of the connecting portion gradually increases from one end adjacent to the bent portion to the other end.

[0009] Furthermore, in the microwave heating device for the liquid, the outer tank further has a plurality of peep holes penetrating the wall of the outer tank respectively.

[0010] Furthermore, in the microwave heating device for the liquid, the outer tank has a main body that is a hollow tubular body and an upper cover provided on the main body so as to cover the main body, the external gas discharge port and the external liquid injection port are located on the upper cover, each of the peep holes is located on the main body, the inner tank is provided with an internal liquid injection pipe extending outward at the position of the internal liquid injection port, and the internal liquid injection pipe penetrates through the external liquid injection port and is exposed.

[0011] Furthermore, in the microwave heating device for the liquid, an internal gas discharge pipe extending outward is provided at the position of the internal gas discharge port in the inner tank, the position of the internal gas discharge pipe corresponds to the position of the external gas discharge port of the outer tank, and the internal gas discharge pipe communicates with the external gas discharge port.

[0012] Furthermore, in the microwave heating device for the liquid, the bent portion is a bent pipe with a bending angle of about 90°.

Advantages of the Invention

[0013] As described above, the present invention has the following advantages. A microwave oscillator generates microwaves, and after changing the traveling direction of the microwaves by a connecting duct, a tuning sheet containing a dielectric material in an expansion pipe expands the microwave field to a uniform intensity, increasing the heating area. At the same time, microwaves are incident on the tuning bottom plate from the bottom of the outer tank. Also, for impedance matching and adjustment, the thickness of the tuning bottom plate containing a dielectric material is appropriately selected, and the liquid to be heated is irradiated from bottom to top. During the heating process, the boiled liquid is vaporized and rises naturally, and can be discharged from the internal gas discharge port and the external gas discharge port located above. Thereby, when the liquid boils, the drawback that the liquid to be heated is continuously pushed out of the heating region due to pressure imbalance can be avoided. On the other hand, when the heating of the liquid reaches an equilibrium state, the stub tuner can be further finely adjusted to improve the operation and efficiency, so that the liquid can be directly heated, distilled quickly, uniformly, and efficiently, and the catalytic action of heating on the liquid can be achieved.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0015] Hereinafter, the technical means used to achieve the object of the present invention will be described with reference to the drawings and preferred embodiments of the present invention as appropriate.

[0016] As shown in FIG. 1, the microwave heating device for a liquid of the present invention includes a microwave oscillator 10, a circulator 20, a stub tuner 30, a connecting duct 40, an expansion tube 50, a support 60, and a heating chamber 70.

[0017] The microwave oscillator 10 is a device for generating microwaves. Since this is a prior art, its detailed description will be omitted.

[0018] One end of the circulator 20 is connected to the microwave oscillator 10, and it is used to protect the microwave source, that is, it provides a protection function when microwaves are reflected and returned from the rear end. Since this is a prior art, its detailed description will be omitted.

[0019] One end of the stub tuner 30 is connected to the other end of the circulator 20. In this embodiment, a 3-stub type stub tuner 30 is used, but it is not limited thereto. The stub tuner 30 achieves impedance matching by matching and adjusting microwaves. The impedance matching refers to a state in which a high-frequency microwave signal is not reflected back to the signal source when it is transmitted to a load. Since this is a prior art, its detailed description will be omitted.

[0020] As shown in FIGS. 2 to 4, the connecting duct 40 is a duct having a rectangular cross-section, and has a bent portion 41 and a connecting portion 42. One end of the bent portion 41 is connected to and communicates with one end of the connecting portion 42. The other end of the bent portion 41 is connected to the other end of the stub matcher 30, and the other end of the connecting portion 42 extends upward. Specifically, the bent portion 41 is a bent pipe with a bending angle of about 90°. When each of the above devices is placed on a plane, one end of the bent portion 41 is in a horizontal state, and the other end of the bent portion 41 extends upward along a direction perpendicular to the plane. Inside the connecting portion 42, a plurality of convex portions 421 are formed. Each convex portion 421 protrudes around the inner wall surface of the connecting portion 42, and the convex portions 421 are arranged at intervals. The inner diameter of the connecting portion 42 gradually increases from one end adjacent to the bent portion 41 toward the other end, and a plurality of support frames are installed on the outer peripheral edge of the connecting portion 42 to further improve the supportability, but it is not limited thereto, and the convex portions 421 may not be formed. Further, the form of the connecting duct 40 can be changed according to the user's requirements.

[0021] The expansion duct 50 is a duct having a rectangular cross-section, and has a narrow end 51 and a wide end 52. The inner diameter of the expansion duct 50 gradually increases from the narrow end 51 toward the wide end 52, while the inner diameter of the wide end 52 is maintained constant. The expansion duct 50 is connected to the connecting portion 42 of the connecting duct 40 at the narrow end 51, and a plurality of adjustment sheets 521 are installed on the inner wall of the wide end 52. Each adjustment sheet 521 contains a dielectric material, and the dielectric material includes alumina ceramics. An annular protrusion 522 protrudes from the opening edge adjacent to the wide end 52, but it is not limited thereto. The form of the expansion duct 50 and the type of the dielectric material can be changed according to the user's requirements.

[0022] The support 60 is a circular sheet body, and a through-hole 61 is provided. The through-hole 61 is a rectangular hole, and its shape corresponds to the shape of the annular projection 522 of the expansion pipe 50. The support 60 fixes the annular projection 522 so that the annular projection 522 is fitted into the through-hole 61, but is not limited thereto. The form of the support 60 can be changed according to the user's requirements.

[0023] The heating chamber 70 has an outer tank 71, an adjustment bottom plate 72, and an inner tank 73. In the outer tank 71, an enclosed internal space, a bottom opening 711 communicating with the internal space, an external gas discharge port 712, an external liquid injection port 713, and a plurality of viewing holes 714 are formed. In the present embodiment, the outer tank 71 has an upper lid 715 and a main body 716. The main body 716 is a hollow columnar body, and the upper lid 715 is provided on the main body 716 so as to cover the main body 716. The bottom opening 711 is located below the main body 716, and the external gas discharge port 712 and the external liquid injection port 713 are located on the upper lid 715. Each viewing hole 714 is located in the main body 716, and the viewing hole 714 is provided with a protruding opening for the user to observe the state of the internal liquid, but is not limited thereto, and the viewing hole 714 may not be provided. The outer tank 71 is fixed to the support 60 at the position of the bottom opening 711 and communicates with the wide end 52 of the expansion pipe 50. The outer shells of the external gas discharge port 712, the external liquid injection port 713, and the viewing hole 714 are each designed according to their respective diameters. In order to prevent microwave leakage, an outer shell of sufficient length is designed by using the principle of the waveguide cut-off frequency.

[0024] The adjustment bottom plate 72 includes a dielectric material, and the adjustment bottom plate 72 is installed inside the inner space of the outer tank 71 to seal the bottom opening 711. In the inner tank 73, an enclosed storage space, an internal gas discharge port 731 communicating with the storage space, and an internal liquid injection port 732 are formed. The inner tank 73 is installed inside the outer tank 71, the internal gas discharge port 731 communicates with the external gas discharge port 712, and the internal liquid injection port 732 communicates with the external liquid injection port 713. In this embodiment, the inner tank 73 is provided with an internal gas discharge pipe 733 extending outward at the position of the internal gas discharge port 731, and the position of the internal gas discharge pipe 733 corresponds to the position of the external gas discharge port 712 outside the outer tank 71. Also, in this embodiment, the internal gas discharge pipe 733 extends upward and penetrates and exposes the external gas discharge port 712, but is not limited thereto. Further, the inner tank 73 is provided with an internal liquid injection pipe 734 extending outward at the position of the internal liquid injection port 732, and the internal liquid injection pipe 734 penetrates and exposes the external liquid injection port 713, but is not limited thereto. The form of the heating chamber 70 can be changed according to the requirements of the user.

[0025] As shown in FIGS. 1 and 4, when using the present invention, the liquid to be heated is injected into the inner tank 73 from the outside through the internal liquid injection pipe 734. The microwave generated by the microwave oscillator 10 changes its traveling direction through the circulator 20 and the stub tuner 30, and is expanded to a uniform intensity by the adjustment sheet 521 containing a dielectric material in the expansion pipe 50, increasing the heating area. At the same time, the microwave is incident on the adjustment bottom plate 72 from the bottom of the outer tank 71. Also, for impedance matching and adjustment, the thickness of the adjustment bottom plate containing a dielectric material is appropriately selected, and the liquid to be heated is irradiated from bottom to top. In the process of heating, the boiled liquid is vaporized and rises naturally, and can be discharged from the internal gas discharge port 731 and the external gas discharge port 712 located above. Thereby, when the liquid boils, the drawback that the liquid to be heated is continuously pushed out of the heating region due to the pressure imbalance can be avoided.

[0026] In addition, in the above process, when the heating of the liquid reaches an equilibrium state, the stub tuner can be further finely adjusted to improve the action and efficiency. Therefore, the liquid can be directly heated quickly, uniformly, and efficiently for distillation, and the catalytic action of heating on the liquid can be achieved.

[0027] Furthermore, regarding the above process, a plurality of convex portions 421 are formed inside the connecting portion 42, so that the aspect ratio of the connecting duct 40 can be well matched with the enlarged pipe 50 having a larger inner diameter (i.e., no reflection is generated), and the microwave can be guided from the narrow end 51 to the wide end 52.

[0028] The above disclosure is only a preferred embodiment of the present creation and does not limit the present creation in any way. The content of the present creation is disclosed in the above preferred embodiment, but the present creation is not limited to the above embodiment. All those skilled in the art can complete equivalent embodiments by slightly changing or modifying the above disclosure without departing from the technical concept of the present creation. In addition, the content that does not depart from the technical concept of the present creation and any simple changes or modifications made to the above embodiment based on the technology of the present creation are included in the equivalent scope of the technical concept of the present creation.

Description of Reference Numerals

[0029] 10 Microwave oscillator 20 Circulator 30 Stub tuner 40 Connecting duct 41 Bending portion 42 Connecting portion 421 Convex portion 50 Enlarged pipe 51 Narrow end 52 Wide end 521 Adjusting sheet 522 Annular protrusion 60 Support 61 Through hole 70 Heating chamber 71 Outer tank 711 Bottom opening 712 External gas outlet 713 External liquid inlet 714 Peephole 715 Upper lid 716 Body 72 Adjustment bottom plate 73 Inner tank 731 Internal gas outlet 732 Internal liquid inlet 733 Internal gas discharge pipe 734 Internal liquid injection pipe 90 Microwave oscillator 91 Circulator 92 Stub tuner 93 Heating chamber 94 Adjusting plunger 95 Reaction tube

Claims

1. A microwave oscillator, A circulator having one end connected to the microwave oscillator, A stub matcher having one end connected to the other end of the circulator, A connecting duct having a bent portion and a connecting portion, wherein one end of the bent portion is connected and communicated with one end of the connecting portion, the other end of the bent portion is connected to the other end of the stub matcher, and the other end of the connecting portion extends upward, the connecting duct; An expanding tube having a narrow end and a wide end, the inner diameter of which gradually increases from the narrow end toward the wide end, the narrow end being connected to the connecting portion of the connecting duct, and a plurality of adjusting sheets each containing a dielectric material being provided on the inner wall of the wide end, the expanding tube; A heating chamber having an outer tank, an adjusting bottom plate, and an inner tank, wherein the outer tank is formed with an enclosed internal space, a bottom opening communicating with the internal space, an external gas discharge port, and an external liquid injection port, the outer tank is connected to the wide end of the expanding tube at the position of the bottom opening, the adjusting bottom plate contains a dielectric material and is installed in the internal space of the outer tank to seal the bottom opening, the inner tank is formed with an enclosed storage space, an internal gas discharge port and an internal liquid injection port communicating with the storage space, the inner tank is installed in the outer tank, the internal gas discharge port communicates with the external gas discharge port, and the internal liquid injection port communicates with the external liquid injection port, the heating chamber; comprising A microwave heating device for a liquid, characterized in that.

2. Further comprising a support provided with a rectangular through hole, An annular protrusion projects from the opening edge adjacent to the wide end of the expanding tube, and the support fixes the annular protrusion so that the annular protrusion is fitted into the through hole, The microwave heating device for a liquid according to claim 1, characterized in that.

3. A plurality of convex portions are formed inside the connecting portion, and each of the convex portions is arranged at intervals and projects around the inner wall surface of the connecting portion, and the inner diameter of the connecting portion gradually increases from one end adjacent to the bent portion toward the other end, The microwave heating device for a liquid according to claim 1 or 2, characterized in that.

4. The outer tank further has a plurality of peep holes each penetrating the wall of the outer tank, The microwave heating device for a liquid according to claim 3, characterized in that.

5. The outer tank has a main body which is a hollow tubular body and an upper lid provided on the main body so as to cover the main body. The external gas discharge port and the external liquid injection port are located on the upper lid, and each of the peep holes is located on the main body. The inner tank is provided with an internal liquid injection pipe extending outward at the position of the internal liquid injection port, and the internal liquid injection pipe penetrates through the external liquid injection port and is exposed. The microwave heating device for liquid according to claim 4, characterized in that.

6. The inner tank is provided with an internal gas discharge pipe extending outward at the position of the internal gas discharge port. The position of the internal gas discharge pipe corresponds to the position of the external gas discharge port of the outer tank, and the internal gas discharge pipe communicates with the external gas discharge port. The microwave heating device for liquid according to claim 5, characterized in that.

7. The bent portion is a bent pipe with a bending angle of about 90°. The microwave heating device for liquid according to claim 6, characterized in that.

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