JP7258109B1 - microwave heating device - Google Patents

Abstract

An object of the present invention is to provide a reaction tube whose inclination can be adjusted and to adjust the distance between the reaction tube and the reflecting member, so that the impedance of microwaves can be matched with respect to different liquids to be heated, and the fluid can be heated. Provided is a microwave heating device that can be adjusted to an optimum matching frequency band according to changes in resistance. A microwave heating apparatus includes a magnetron oscillator, a circulator (20) connected to the magnetron oscillator (10), and a chamber body that penetrates the chamber body while intersecting the chamber body and the chamber body at an angle of less than 90 degrees. A heating chamber 30 including a reaction tube fixed on the main body and connected to the other end of the circulator, a reflective member movably installed in the chamber main body and having a reflecting surface facing the reaction tube, and a reflecting member connected to the heating chamber 30. and an end assembly including an adjustment member used to adjust the distance of the reflector member to the reaction tube. [Selection drawing] Fig. 1

Description

The present invention relates to heating devices, and more particularly to microwave heating devices.

Conventionally, an indirect heating method is generally used for heating corrosive liquids, but indirect heating requires a great deal of time and energy and is inefficient as a heating means. As shown in FIGS. 4 and 5, there is also a microwave heating method among conventional fluid heating methods. The principle of microwave heating is to place a dielectric in an alternating electric field, and the dielectric Induces dielectric loss to generate heat. The microwave heating method is widely used for rapid heating, distillation, thermal activation, chemical reaction by heating, etc. of industrial chemicals and chemical products. , a circulator 91, a stub matching device 92, a heating chamber 93 and an adjustment plunger 94. The magnetron oscillator 90 generates microwaves, and the circulator 91 terminates the magnetron oscillator 90. The heating chamber 93 is used for protection from microwaves that have been reflected and returned by members, and the heating chamber 93 irradiates and heats the object to be heated with microwaves. A reaction tube 95 extending in an orthogonal direction through which the liquid to be heated passes is provided, and the stub alignment device 92 and the adjusting plunger 94 are aligned when the liquid to be heated passes through the heating chamber 93 . They cooperate to adjust the microwaves emitted to the heating chamber 93 so as to obtain the optimum heating effect.

When a chemical liquid is heated by microwaves, the dielectric constant and dielectric loss of the chemical liquid are both a function of frequency and highly related to the temperature of the liquid. There is a phenomenon in which the dielectric loss changes abruptly. Since the impedance matching is constantly changing due to changes in the dielectric constant and dielectric loss, the output power of the microwave radiation during the heating process changes rapidly, resulting in unstable heating efficiency. To solve the problem that the impedance changes during the microwave heating process, the conventional solution is to install an expensive stub matcher 92, but the stub matcher 92 not only has a high installation cost, but also However, in some situations, it is not possible to respond quickly to rapidly changing impedance.

Taiwan Patent No. TWI689226

The present invention has been made in view of the above-mentioned drawbacks of the prior art. It is an object of the present invention to provide a microwave heating device capable of matching the impedance of microwaves for different liquids to be heated and adjusting the optimum matching frequency band according to changes in fluid resistance. there is

To achieve the above objects, the present invention provides a microwave heating apparatus including a magnetron oscillator, a circulator, a heating chamber and an end assembly, comprising:
one end of the circulator is connected to the magnetron oscillator;
The heating chamber includes a chamber body and a reaction tube, the chamber body being a hollow body with an imaginary centerline, having a microwave inlet and a connecting end at opposite ends, through the microwave inlet. is connected to the other end of the circulator by a circulator, and the reaction tube has an imaginary axis, and the chamber main body is arranged in a state where the imaginary axis intersects the imaginary center line of the chamber main body at an angle of less than 90 degrees. penetrated and fixed on the chamber body,
The end assembly includes a reflective member and an adjustment member, the reflective member movably mounted within the chamber body so as to be positioned between the reaction tube and the connecting end, and the reaction tube. A reflective surface facing the tube is provided, and the adjustment member is installed at the connecting end of the chamber body and connected with the reflective member, and is used to adjust the distance of the reflective member to the reaction tube. Characterized by

The chamber main body has a tubular body with a hollow quadrangular cross section and has an upper through hole and a lower through hole, and the upper through hole and the lower through hole are arranged coaxially and obliquely. It is characterized in that the reaction tube is installed so as to pass through the upper through-hole and the lower through-hole of the chamber main body.

Two fixtures are installed on the outer wall surface of the chamber body, each fixture has a through hole and a plurality of screw holes, and one through hole of the fixture is located in the upper through hole. The through hole of the other fixture is aligned with the lower through hole, and the reaction tube comprises a tube body and two attachments attached to the outer periphery of the tube body. , a plurality of mounting holes are provided through each mounting portion, and the mounting positions of the mounting holes correspond to the mounting positions of the screw holes, and the pipe body is inserted through the mounting holes. It is characterized by being held in the chamber body so as to be inserted through through holes of the fixtures of the chamber body via a plurality of fasteners screwed into the screw holes.

A fastening hole having a female thread is formed in the end surface of the reflecting member opposite to the one end where the reflecting surface is installed, and the adjusting member includes a guide screw rod, a connecting rod, a handle, and a coupling piece. one end of the guide screw rod is fixedly connected to the chamber body, and has an axial hole axially penetrating the guide screw rod and communicating with the connection end, and a male screw at one end of the connection rod. A ridge is formed, and a flange portion is formed to protrude annularly at the other end, and the connecting rod passes through the shaft hole of the guide screw rod and the connecting end through the end having the male thread, thereby A coupling chamber is formed in the handle, which is screwed into a fastening hole of a member and has a female screw thread on the inner surface of one end and a coupling hole portion on the end surface of the other end, and the handle is threaded into the female screw of the coupling chamber. It is axially movably screwed into the guide threaded rod via a thread, and has a contact portion and a restricting portion on opposite side surfaces of the connecting piece. The connecting piece is fitted into the connecting hole of the handle and connected to the connecting rod via the contact portion, and is connected to the connecting rod via the restricting portion and the flange portion of the connecting rod. and clamping the bottom end of the handle.

As described above, according to the present invention, it is possible to change the angle of intersection between the imaginary axis of the pipe body and the imaginary centerline of the chamber body, and the inclination angle of the reflecting surface of the reflecting member; The ability to adjust the distance between the virtual axis of the tube body allows matching of the microwave impedance to different liquids to be heated and changes as the temperature of the liquid increases. Since the optimum matching frequency band can be adjusted according to the fluid resistance, it can be widely applied to various liquids. Therefore, the output power of microwave radiation during the heating process does not fluctuate abruptly and has the effect of increasing the heating efficiency. Since there is no need to provide a separate stub matcher, the complexity and installation cost of the device can be reduced.

1 is a perspective view of a preferred embodiment of the present invention; FIG. 2 is an axial cross-sectional view of a partial component of FIG. 1; FIG. FIG. 3 is a cross-sectional view showing a state in which the reflecting member of FIG. 2 is retracted; 1 shows a prior art microwave heating device; FIG. FIG. 2 is a schematic diagram showing the direction of flow of liquid and the direction of travel of microwaves in a heating chamber of the prior art;

The technical measures taken by the present invention to achieve the predetermined objects of the invention will be described in more detail below with reference to the drawings and preferred embodiments of the present invention.

As shown in FIG. 1, the microwave heating apparatus of the present invention includes a magnetron oscillator 10, a circulator 20, a heating chamber 30 and an end assembly 40. As shown in FIG.

The magnetron oscillator 10 is a device for generating microwaves. Since the magnetron oscillator 10 here is a conventional technology, description of its features and detailed structure will be omitted.

The circulator 20 is installed so that one end thereof is connected to the magnetron oscillator 10, and is a device used to protect the magnetron oscillator 10 from reflected microwaves. Since the circulator 20 here is conventional technology, description of its features and detailed structure will be omitted.

As shown in FIGS. 1 to 3, the heating chamber 30 includes a chamber body 31 and a reaction tube 32. The chamber body 31 has a hollow rectangular cross section and a microwave inlet 311, A connecting end 312, an upper through-hole 313 and a lower through-hole 314 are provided, the microwave inlet 311 and the connecting end 312 are respectively disposed at opposite ends of the chamber body 31, and the upper through-hole 313 and the lower through-hole are arranged. Holes 314 are formed in both wall surfaces of the chamber body 31 facing each other vertically so as to be arranged coaxially and obliquely. Two fixtures 315 are installed on the outer wall surface of the chamber body 31, and each fixture 315 includes a through hole 316 passing through the fixture 315 and a plurality of screw holes 317 having female threads. Specifically, the through hole 316 of one fixture 315 is aligned with the upper through hole 313 , and the through hole 316 of the other fixture 315 is aligned with the lower through hole 314 . The chamber body 31 is connected via the microwave introduction port 311 to the end opposite to the one end of the circulator 20 connected to the magnetron oscillator 10, and extends along the extending direction of the chamber body 31. has an imaginary centerline 318 .

The reaction tube 32 includes a tube body 321 and two mounting portions 322 attached to the outer periphery of the tube body 321. Each mounting portion 322 is provided with a plurality of mounting holes 323. The installation position of the mounting hole 323 corresponds to the installation position of each screw hole 317 . The tube main body 321 is preferably a hollow tubular body made of quartz, but is not limited to this, and may be made of a material through which microwaves can easily pass. The reaction tube 32 is inserted through the through hole 316 of each fixture 315 of the chamber main body 31, the upper through hole 313, and the lower through hole 314, and is inserted through the mounting hole 323 of the mounting portion 322. Although it is held in the chamber body 31 via a plurality of fasteners that are screwed into the screw holes 317 of the chamber body, the reaction tube 32 is not limited to this, and the reaction tube 32 is held in the chamber body as necessary. The method of fixing to 31 can be changed as appropriate. For example, the reaction tube 32 may be directly fixed to the upper through-hole 313 and the lower through-hole 314 of the chamber main body 31 . The reaction tube 32 has an imaginary axis 324 along the axial direction, and the imaginary axis 324 and the imaginary center line 318 obliquely intersect at an angle θ of less than 90 degrees.

The end assembly 40 includes a reflecting member 41 and an adjusting member 42. The reflecting member 41 is a rectangular parallelepiped having a shape corresponding to that of the chamber main body 31, and has reflecting surfaces 411 arranged at opposite ends. A fastening hole 412 is provided, and the reflection surface 411 is an inclined surface, the inclination angle of which can be arbitrarily set according to need, and the fastening hole 412 has a female screw thread. Specifically, the reflecting member 41 is movably installed in the chamber body 31 so as to be disposed between the reaction tube 32 and the connecting end 312, and the reflecting surface 411 of the reflecting member 41 is , are arranged to face the reaction tube 32 .

The adjustment member 42 includes a guide threaded rod 43, a connecting rod 44, a handle 45 and a coupling piece 46, the guide threaded rod 43 having a male thread on its outer wall and an axial hole in its center. 431 is formed to penetrate. One end of the guide threaded rod 43 is fixedly connected to the chamber body 31 , and the shaft hole 431 communicates with the connecting end 312 . Since the fixing method of the guide screw rod 43 is a well-known technique, the description of its characteristics and detailed structure will be omitted. One end of the connecting rod 44 has a male screw thread, and the other end has a flange portion 441 protruding in an annular shape. The connecting rod 44 passes through the shaft hole 431 of the guide screw rod 43 and the connecting end 312 via the end having a male thread, and is screwed into the fastening hole 412 of the reflecting member 41 . The handle 45 has a coupling chamber 451 formed therein, a female thread on the inner surface of one end of the coupling chamber 451, and a coupling hole 452 on the other end of the coupling chamber 451. 452 has a connecting bottom plate portion 453 on the periphery of the opening. The connecting piece 46 has a contact portion 461 and a restricting portion 462 arranged on opposite side surfaces. The connecting piece 46 is fastened and fixed to the connecting rod 44 via a fastener in a state where the corresponding contact portion 461 is fitted in the connecting hole 452 of the handle 45 and is in contact with the connecting rod 44 . there is More specifically, the restricting portion 462 of the connecting piece 46 and the flange portion 441 of the connecting rod 44 loosely clamp the connecting bottom plate portion 453 of the handle 45 . The handle 45 is screwed with the male screw thread of the guide screw rod 43 via the female screw thread of the coupling chamber 451 , and is axially movable on the guide screw rod 43 by rotating the connecting rod 44 . is. As the handle 45 moves, the connecting rod 44 and the reflecting member 41 move together. The configuration of the adjusting member 42 is not limited to the above, and can be appropriately changed in design as required, as long as the distance of the reflecting member 41 to the reaction tube 32 can be adjusted.

As shown in FIGS. 1 and 2, the microwave heating apparatus according to the present invention is connected to a liquid inflow path (not shown) at one end of the tube body 321 and a liquid outflow path (not shown) at the other end during use. (not shown) to allow the liquid to be heated to pass through the tube body 321, where transport of the liquid is conventional technology and will not be described in detail. On the other hand, the pipe main body 321 is combined with the wall surface of the chamber main body 31 so as to obliquely intersect with the wall surface of the chamber main body 31 at an intersection angle θ. The length of the tube body 321 accommodated within 31 is also increased. The intersection angle θ between the pipe main body 321 and the chamber main body 31 can be appropriately set by selecting and attaching the fixture 315 having an appropriate angle according to the properties of different liquids to be heated. Specifically, by replacing the fixture 315 with a different inclination angle of the through hole 316, the inclination angle of the pipe body 321 inserted therein is changed, and the above-described intersection angle θ is set. Moreover, the inclination angle of the reflection surface 411 of the reflection member 41 can be changed according to the inclination angle of the pipe main body 321, and the reflection member 41 can be replaced with a reflection member 41 having a different angle. In short, according to the liquid to be heated, the crossing angle θ between the pipe body 321 and the chamber body 31 and the inclination angle of the reflecting surface 411 of the reflecting member 41 can be appropriately set, and the liquid heated by the microwaves can be set appropriately. Referring to FIGS. 2 and 3, the distance of the reflecting surface 411 to the pipe body 321 can be adjusted immediately by turning the handle 45 according to the fluid resistance that changes with the temperature rise of the liquid. , it is possible to achieve microwave impedance matching for different liquids, and to adjust the optimum matching frequency band, so that it can be widely applied to various liquids. In addition, the optimally tuned matching frequency band can accommodate changes in the dielectric properties of the liquid being microwave-heated, so that the output power of the microwave radiation during the heating process does not rise or fall abruptly. It has the effect of increasing the heating efficiency, and in addition, since there is no need to provide a precise and expensive stub matching device (not shown) as in the prior art, the complexity and installation cost of the device can be reduced.

The above description is merely a preferred embodiment of the present invention, and does not limit the present invention in any way. Although the present invention has been disclosed with a relatively preferred embodiment as described above, this is not intended to limit the present invention, and any person skilled in the art can understand the technology of the present invention to the extent that it does not depart from the technical concept of the present invention. Any simple modifications, changes and modifications made to the above embodiments based on the essence of are all still within the scope of the technical concept of the present invention.

10 magnetron oscillator 20 circulator 30 heating chamber 31 chamber main body 311 microwave inlet 312 connecting end 313 upper through-hole 314 lower through-hole 315 fixture 316 through-hole 317 screw hole 318 imaginary center line 32 reaction tube 321 tube main body 322 mounting portion 323 Mounting hole 324 Virtual axis 40 End assembly 41 Reflecting member 411 Reflecting surface 412 Fastening hole 42 Adjusting member 43 Guide screw rod 431 Shaft hole 44 Connecting rod 441 Flange 45 Handle 451 Connecting chamber 452 Connecting hole 453 Connecting bottom plate 46 Connecting piece 461 Contact portion 462 Regulating portion 90 Magnetron oscillator 91 Circulator 92 Stub matching device 93 Heating chamber 94 Adjusting plunger 95 Reaction tube θ Angle of intersection

Claims (1)

A microwave heating apparatus comprising a magnetron oscillator, a circulator, a heating chamber and an end assembly, comprising:
one end of the circulator is connected to the magnetron oscillator;
The heating chamber includes a chamber body and a reaction tube, the chamber body being a hollow body with an imaginary centerline, having a microwave inlet and a connecting end at opposite ends, through the microwave inlet. is connected to the other end of the circulator by a circulator, and the reaction tube has an imaginary axis, and the chamber main body is arranged in a state where the imaginary axis intersects the imaginary center line of the chamber main body at an angle of less than 90 degrees. penetrated and fixed on the chamber body,
The end assembly includes a reflective member and an adjustment member, the reflective member movably mounted within the chamber body so as to be positioned between the reaction tube and the connecting end, and the reaction tube. a reflective surface facing the tube, the adjustment member being installed at the connection end of the chamber body and connected to the reflective member, and used to adjust the distance of the reflective member to the reaction tube;
The chamber main body has a tubular body with a hollow quadrangular cross section and has an upper through hole and a lower through hole, and the upper through hole and the lower through hole are arranged coaxially and obliquely. Perforated on both walls facing the top and bottom of the main body,
The reaction tube is installed so as to pass through an upper through-hole and a lower through-hole of the chamber main body ,
Two fixtures are installed on the outer wall surface of the chamber body, each fixture has a through hole and a plurality of screw holes, and one through hole of the fixture is located in the upper through hole. and the through hole of the other fixture is aligned with the lower through hole,
The reaction tube has a tube body and two mounting portions attached to the outer circumference of the tube body, and a plurality of mounting holes are provided through each of the mounting portions, and the mounting positions of the mounting holes are set as described above. Corresponding to the installation position of each screw hole, the pipe body is attached to each fixture of the chamber body via a plurality of fasteners inserted through each mounting hole and screwed into each screw hole. held by the chamber body so as to pass through the through-hole ,
A fastening hole having a female thread is formed in the end surface of the reflecting member opposite to the one end where the reflecting surface is installed,
the adjustment member includes a guide threaded rod, a connecting rod, a handle, and a coupling piece;
The guide screw rod has one end fixedly connected to the chamber body, and has an axial hole that axially penetrates the guide screw rod and communicates with the connection end,
One end of the connecting rod is formed with a male screw thread, and the other end is formed with an annularly protruding flange portion. is inserted and screwed into the fastening hole of the reflecting member,
A coupling chamber having a female screw thread on the inner surface of one end and a coupling hole portion on the end surface of the other end is formed in the handle, and the handle is connected to the guide screw rod via the female screw thread of the coupling chamber. is axially movably screwed into the
The connecting piece has a contact portion and a restricting portion on opposite side surfaces, the outer diameter of the contact portion is smaller than the outer shape of the restricting portion, and the connecting piece is connected to the handle via the contact portion. A microwave heating device fitted in a coupling hole and connected to the connecting rod, wherein the bottom end of the handle is clamped via the restricting portion and the flange portion of the connecting rod.

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