CN210840115U

CN210840115U - Coaxial CTS antenna for microwave heating

Info

Publication number: CN210840115U
Application number: CN201921284389.1U
Authority: CN
Inventors: 毋明旗; 卢晓颖; 蒋顺利; 刘宁; 徐翔新; 夏立新; 刘伟; 罗鹏
Original assignee: Kunshan jiuhua electronic equipment factory
Current assignee: Kunshan jiuhua electronic equipment factory
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2020-06-23
Anticipated expiration: 2029-08-09

Abstract

The utility model discloses a coaxial CTS antenna for microwave heating, this kind of coaxial CTS antenna for microwave heating include waveguide mode converter, N (N is greater than or equal to 2) CTS unit and N-1 packing medium, waveguide mode converter comprises crossover sub, mode conversion boss and inner conductor, and crossover sub's coaxial port and CTS unit butt joint set up, and the CTS unit is established ties in proper order end to end, has inlayed the packing medium between the CTS unit, and the packing medium passes through screwed connection to on the CTS unit. In this way, the utility model discloses simple structure carries out microwave heating in can stretching into the material for the material is by the even heating along thickness direction, convenient to use, and application prospect is very wide.

Description

Coaxial CTS antenna for microwave heating

Technical Field

The utility model relates to a microwave heating technical field especially relates to a coaxial CTS antenna for microwave heating.

Background

The microwave heating technology is characterized in that a microwave alternating electromagnetic field directly heats the interior of a material through interaction of polar molecules in the material, the microwave heating technology has the advantages of high heating speed, high energy conversion efficiency, safety, reliability and the like, antennas commonly used for microwave heating at present are horn antennas, waveguide slot antennas and the like, and the antennas are usually erected above the material so that a radiation surface of the antennas faces the material, and therefore the material is heated.

In a general application scenario, the thickness of the material to be heated is limited, so that the material can be heated substantially simultaneously in the thickness direction, but if the material to be heated is thick, the energy of the microwave exhibits exponential attenuation with the increase of the depth of the material, so that the material is heated unevenly in the thickness direction, so that the temperature of the material above is high, but the material below is not heated sufficiently, which causes a great limitation to the application of microwave heating, but if the antenna for microwave heating is inserted into the material for heating, the limitation can be broken, so that the material is heated uniformly in the thickness direction.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a coaxial CTS antenna for microwave heating, simple structure can stretch into and carry out microwave heating in the material for the material is by the even heating along thickness direction, convenient to use, and application prospect is very wide.

In order to solve the technical problem, the utility model discloses a technical scheme be: the coaxial CTS antenna for microwave heating comprises a waveguide mode converter, N (N is larger than or equal to 2) CTS units and N-1 filling media, wherein the waveguide mode converter consists of a transition joint, a mode conversion boss and an inner conductor, a coaxial port of the transition joint is in butt joint with the CTS units, the CTS units are sequentially connected in series end to end, the filling media are embedded between the CTS units, and the filling media are connected to the CTS units through screws.

Preferably, the transition joint comprises a rectangular waveguide, a matching circular waveguide and a coaxial port, one port of the rectangular waveguide is an input feed port, the input feed port is in butt joint connection with the microwave generating device, and the other port of the rectangular waveguide is in short circuit.

Preferably, a matching circular waveguide is arranged between the rectangular waveguide and the coaxial port, the matching circular waveguide is installed on the wide edge of one side of the outer wall of the rectangular waveguide through screws or welding, the height of the matching circular waveguide is 1/4 of the wavelength of the used microwave, the coaxial port is installed below the matching circular waveguide through screws or welding, and the coaxial port is concentric with the matching circular waveguide.

Preferably, one end of the inner conductor is in butt joint with the top of the mode conversion boss, and the other end of the inner conductor extends into the serially connected CTS unit and is in butt joint with the tail end of the Nth CTS unit.

Preferably, the mode conversion boss is installed on a wide side of one side in the rectangular waveguide cavity through screws or welding, and the center position of the mode conversion boss is located right above the coaxial port.

Preferably, the mode conversion boss is in a truncated cone shape.

Preferably, the CTS unit is a metal pipe with flanges at both sides, and the metal pipe is a polygonal metal pipe or a circular metal pipe.

Preferably, the tail ends of the CTS unit and the Nth CTS unit are short-circuited.

Preferably, the filling medium is provided with holes, the hole positions are consistent with those of the flanges on the CTS unit, and the filling medium is made of polytetrafluoroethylene, polypropylene, ceramic or quartz glass wave-transmitting medium.

Preferably, the screw used for connecting the CTS units is made of polytetrafluoroethylene, polypropylene or ceramic wave-transparent material.

The rectangular waveguide input port of the coaxial CTS antenna capable of stretching into the material for microwave heating is connected with a microwave source, and the power of the microwave source is continuously adjustable from 30KW to 100 KW.

Compared with the prior art, the beneficial effects of the utility model are that:

a. the microwave heating device can extend into a material to carry out microwave heating, so that the material is uniformly heated in the thickness direction;

b. simple structure, convenient use and very wide application prospect.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is a cross-sectional view of an electric field distribution according to an embodiment of the present invention.

Fig. 4 is a plan view of an electric field distribution according to an embodiment of the present invention.

Fig. 5 is a scale of the electric field strength of fig. 3 and 4.

Fig. 6 is a power reflection result diagram after electromagnetic simulation according to an embodiment of the present invention.

The reference numerals in the drawings of the specification are explained as follows: waveguide mode converter-1, CTS unit-2, filling medium-3, transition joint-11, mode conversion boss-12, inner conductor-13, rectangular waveguide-111, matching circular waveguide-112 and coaxial port-113.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to make clear and definite definitions of the protection scope of the present invention.

Referring to fig. 1 to 6, an embodiment of the present invention includes:

the coaxial CTS antenna for microwave heating comprises a waveguide mode converter 1, six CTS units 2 and five filling media 3, wherein the waveguide mode converter 1 consists of a transition joint 11, a mode conversion boss 12 and an inner conductor 13, a coaxial port 113 of the transition joint 11 is in butt joint with the CTS units 2, the CTS units 2 are sequentially connected in series end to end, the filling media 3 are embedded between the CTS units 2, and the filling media 3 are connected to the CTS units 2 through screws.

The transition joint 11 comprises a rectangular waveguide 111, a matching circular waveguide 112 and a coaxial port 113, wherein one port of the rectangular waveguide 111 is an input feed port, the input feed port is in butt joint connection with a microwave generating device, and the other port of the rectangular waveguide 111 is in short circuit.

A matched circular waveguide 112 is arranged between the rectangular waveguide 111 and the coaxial port 113, the matched circular waveguide 112 is installed on the wide edge of one side of the outer wall of the rectangular waveguide 111 through screws or welding, the height of the matched circular waveguide 112 is 82mm and is 1/4 of the used 915MHz microwave wavelength, the coaxial port 113 is installed below the matched circular waveguide 112 through screws or welding, and the coaxial port 113 and the matched circular waveguide 112 are concentric.

One end of the inner conductor 13 is in butt joint with the top of the mode conversion boss 12, and the other end of the inner conductor extends into the serially connected CTS unit 2 and is in butt joint with the tail end of the 6 th CTS unit 2.

The mode conversion boss 12 is installed on the wide edge of one side in the cavity of the rectangular waveguide 111 through screws or welding, and the center of the mode conversion boss 12 is located right above the coaxial port 113.

The mode conversion boss 12 is in a circular truncated cone shape.

The CTS unit 2 is a metal round pipe with flanges on two sides.

And the tail ends of the CTS unit 2 and the 6 th CTS unit are short-circuited.

The filling medium 3 is provided with holes, the hole positions are consistent with those of the flanges on the CTS unit 2, and the material of the filling medium 3 is polytetrafluoroethylene.

And screws used for connecting the CTS units 2 are made of polytetrafluoroethylene.

The utility model relates to an example of coaxial CTS antenna in application for microwave heating: with the input of utility model device access 915 MHz's microwave source, CTS antenna 2 stretches into and heats in the sand-containing fatlute that thickness is up to 1.4m, in the thickness direction, as shown in fig. 3, fatlute is whole to be heated, the degree of consistency is fine, from the top view, as shown in fig. 4, the effective zone of heating is a plurality of rings concentric with CTS antenna 2, make each layer material along the thickness direction all by effective heating in different positions department, and this antenna power reflection characteristic is good, after the input is transferred and is matchd, the power reflection of antenna is-23 dB in 915MHz department, only 1/200 for input power.

The utility model relates to a coaxial CTS antenna for microwave heating, simple structure can stretch into and carry out microwave heating in the material for the material is by the even heating along thickness direction, convenient to use, and application prospect is very wide.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A coaxial CTS antenna for microwave heating, characterized by: the coaxial CTS antenna for microwave heating comprises a waveguide mode converter, N CTS units and N-1 filling media, wherein N is larger than or equal to 2, the waveguide mode converter consists of a transition joint, a mode conversion boss and an inner conductor, a coaxial port of the transition joint is in butt joint with the CTS units, the CTS units are sequentially connected in series end to end, the filling media are embedded between the CTS units, and the filling media are connected to the CTS units through screws.

2. A coaxial CTS antenna for microwave heating as recited in claim 1 wherein: the transition joint comprises a rectangular waveguide, a matched circular waveguide and a coaxial port, wherein one port of the rectangular waveguide is an input feed port, the input feed port is in butt joint connection with the microwave generating device, and the other port of the rectangular waveguide is in short circuit.

3. A coaxial CTS antenna for microwave heating as recited in claim 2 wherein: the microwave cavity is characterized in that a matched circular waveguide is arranged between the rectangular waveguide and the coaxial port, the matched circular waveguide is installed on the wide edge of one side of the outer wall of the rectangular waveguide through screws or welding, the height of the matched circular waveguide is 1/4 of the wavelength of used microwaves, the coaxial port is installed below the matched circular waveguide through screws or welding, and the coaxial port is concentric with the matched circular waveguide.

4. A coaxial CTS antenna for microwave heating as recited in claim 1 wherein: one end of the inner conductor is in butt joint with the top of the mode conversion boss, and the other end of the inner conductor extends into the CTS unit after being connected in series and is in butt joint with the tail end of the Nth CTS unit.

5. A coaxial CTS antenna for microwave heating as recited in claim 1 wherein: the mode conversion boss is installed on the wide edge of one side in the rectangular waveguide cavity through screws or welding, and the center of the mode conversion boss is located right above the coaxial port.

6. A coaxial CTS antenna for microwave heating as recited in claim 1 wherein: the mode conversion boss is in a circular truncated cone shape.

7. A coaxial CTS antenna for microwave heating as recited in claim 1 wherein: the CTS unit is a metal pipe with flanges on two sides, and the metal pipe is a polygonal metal pipe or a metal round pipe.

8. A coaxial CTS antenna for microwave heating as recited in claim 1 wherein: and the tail end of the CTS unit and the Nth CTS unit are short-circuited.

9. A coaxial CTS antenna for microwave heating as recited in claim 1 wherein: the filling medium is provided with holes, the hole positions are consistent with those of the flanges on the CTS unit, and the filling medium is made of polytetrafluoroethylene, polypropylene, ceramic or quartz glass wave-transmitting medium.

10. A coaxial CTS antenna for microwave heating as recited in claim 1 wherein: the screw used for connecting the CTS units is made of polytetrafluoroethylene, polypropylene and ceramic wave-transmitting materials.