CN209748275U

CN209748275U - Microwave-to-direct current conversion system

Info

Publication number: CN209748275U
Application number: CN201920268029.6U
Authority: CN
Inventors: 杨士中
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-02-28
Filing date: 2019-02-28
Publication date: 2019-12-06
Anticipated expiration: 2029-02-28

Abstract

the utility model relates to a conversion system of microwave to direct current belongs to microwave power transmission field. In the system, the microwave column power collector comprises a parabolic reflecting surface, a hyperboloid reflecting surface and a feed source horn, and the whole microwave column power collector is a Cassegrain antenna; a microwave power column emitted by the emitting end of the microwave power transmission system is intercepted by a microwave column power collector and is sent to a microwave radiation horn and a resonant cavity to heat a microwave heating medium in the resonant cavity; by utilizing the characteristics of high efficiency, light weight and no need of air of the Stirling engine, the heat absorbing sheet is added on the outside, so that the external thermal efficiency is improved; the Stirling engine is integrally embedded into a microwave heating medium, and the outer layer of the resonant cavity is insulated by a heat insulation layer; the Stirling engine drives the generator to generate direct current (or power frequency) power to complete conversion from microwave to direct current, namely microwave rectification. The utility model discloses can realize the conversion of efficient microwave to direct current.

Description

Microwave-to-direct current conversion system

Technical Field

The utility model belongs to microwave power transmission field relates to a conversion system of microwave to direct current.

Background

Human beings cause serious environmental pollution for obtaining energy. Human electricity is mainly based on hydroelectric power, thermal power and nuclear power, but the electricity has great influence on the environment. Wind power, ground photovoltaic power, tidal power, greenhouse thermoelectric power and the like can only provide a small amount of electric power. Therefore, the method can only be started from the sky aspect. The photovoltaic cell of 1m2 is directly projected at noon in the sunshine city and can generate 0.3Kw of electric power; and 3-6 Kw of power can be generated in stratosphere and higher sky and day due to no attenuation of the atmospheric layer. The power generated in the sky and the sky is efficiently sent back to the ground by the microwave column. The planned space solar power station sends back 500 ten thousand Kw of electric power, which is equivalent to several nuclear power stations. And the method is long-term continuous, clean, environment-friendly and massive energy. The power of solar energy irradiated on the earth per square meter is about 1000 watts. Gallium arsenide cells of solar panels are currently most efficient, with conversion efficiencies greater than 37%. One square meter of power is 370 watts and one hour is 0.37 degrees. Whereas commercial solar cells are only 13-22% efficient. Therefore, the aerospace solar power station is the fundamental way to solve the energy crisis.

The aerospace solar power station includes: photovoltaic power generation, microwave transmission, microwave rectification and the like. Wherein "microwave generation, microwave transmission, and microwave rectification" are collectively referred to as microwave Power transmission mpt (microwave Power transmission). As far as the current technology is concerned, high power (several Kw) microwave rectification is the bottleneck problem of MPT. Microwave rectification is the conversion (rectification) of microwave power into direct current (or power frequency alternating current) power.

at the present stage, scholars at home and abroad spend a great deal of manpower and material resources, and the research lasts for decades, and the obtained method comprises the following steps:

a rectifying antenna based on Schottky diodes or field effect transistors and a rectifying antenna array. Rectennas are limited by semiconductor devices for use only in low power (watt-level) experimental projects. The utility model also makes experimental study with the predecessor, and obtains 1 watt of direct current power. The calculation is higher level in the same field. But are 4 to 6 orders of magnitude different from the MPT requirement. See "microwave rectenna research progress" spatial electronics.

The gyrotron Microwave rectifier CMR (cyclotron Microwave rectifier) has the advantages of high power (kilowatt level), high efficiency, no harmonic radiation and the like, and is a promising high-power Microwave rectification scheme. However, since the CMR is an electric vacuum device, it has the disadvantages of large volume, heavy weight and high price, so that it is not available in the market at present.

the microwave-heated thermocouple produces a direct current. Some devices on the market are inefficient and low power. Such as the Hi-Z thermoelectric module HZ-20, with an efficiency of 4.5% and a power of 19 watts.

at present, no system and method with low cost, convenient operation and high efficiency are available for realizing the conversion from microwave to direct current.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a microwave-to-dc conversion system, which uses microwave to heat a stirling engine and drive a generator to obtain a dc microwave rectification scheme, which is a simple, cheap and efficient microwave rectification scheme, and especially the rectification output can be conveniently selected to be dc or power frequency ac.

A microwave to direct current conversion system comprises a microwave column power collector, a resonant cavity, a microwave radiation horn, a microwave heating medium, a heat insulation layer, a Stirling engine, a direct current or power frequency generator and a connecting flange;

The microwave column power collector comprises a parabolic reflecting surface, a hyperboloid reflecting surface and a feed source horn; the hyperboloid type reflecting surface is opposite to the reflecting surface of the paraboloid type reflecting surface, and the collecting port of the feed source horn is arranged at the focus of the hyperboloid type reflecting surface; the feed source horn penetrates through the paraboloid type reflecting surface and is connected with the microwave radiation horn through the connecting flange; the microwave radiation horn is communicated with the resonant cavity;

A microwave heating medium is arranged in the resonant cavity;

An insulating layer is arranged on the outer layer of the resonant cavity;

The Stirling engine is connected with the direct current or power frequency generator to drive the direct current or power frequency generator to generate direct current or power frequency electric power.

Further, a heat absorbing plate is arranged outside the Stirling engine to improve the external thermal efficiency of the Stirling engine.

Further, the microwave column power collector is a Cassegrain antenna, and the frequency and the polarization of the Cassegrain antenna are matched with those of the microwave column;

The sizes and polarizations of the microwave radiation loudspeaker and the resonant cavity are matched with the microwave column power collector;

in the resonant cavity, a container for placing microwave heating medium is made of high-temperature material.

further, the resonant cavity is provided with a safety valve and an oil temperature gauge.

in order to achieve the above purpose, the utility model provides a following technical scheme:

The beneficial effects of the utility model reside in that:

The microwave column power collector of the utility model is a Cassegrain antenna, which has high efficiency and feedback, and the frequency and polarization of the antenna are matched with the frequency and polarization of the microwave column; the microwave heating medium and the container in the resonant cavity are made of high-temperature materials, such as cheap rapeseed oil and glass fiber reinforced plastics, so that the external heat energy loss is greatly reduced; furthermore, a heat-insulating layer is additionally arranged outside the resonant cavity, so that the collected microwave power is maximally used for heating a hot cylinder of the Stirling engine; finally, high-efficiency microwave-to-direct current conversion is realized.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

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

fig. 2 is a schematic structural diagram of the second embodiment of the present invention.

reference numerals: the device comprises a power collector of a microwave column, a 2-parabolic reflecting surface, a 3-hyperbolic reflecting surface, a 4-feed horn, a 5-resonant cavity, a 5.1-microwave radiation horn, a 6-microwave heating medium, a 7-insulating layer, an 8-Stirling engine, a 9-direct current or power frequency generator, a 10-direct current or power frequency output, a 11-connecting flange, a 12-cold air cylinder, a 13-heat regenerator and a 14-hot air cylinder.

Detailed Description

the following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Referring to fig. 1-2, a microwave-to-dc conversion system is shown, which includes a microwave column power collector 1, a resonant cavity 5, a microwave radiation horn 5.1, a microwave heating medium 6, a heat insulating layer 7, a stirling engine 8, a dc or power frequency generator 9, and a connecting flange 11;

The microwave column power collector comprises a parabolic reflecting surface 2, a hyperboloid reflecting surface 3 and a feed source loudspeaker 4; the hyperboloid type reflecting surface is opposite to the reflecting surface of the paraboloid type reflecting surface, and the collecting port of the feed source horn is arranged at the focus of the hyperboloid type reflecting surface; the feed source horn penetrates through the paraboloid type reflecting surface and is connected with the microwave radiation horn through the connecting flange 11; the microwave radiation horn is communicated with the resonant cavity;

A microwave heating medium is arranged in the resonant cavity;

an insulating layer is arranged on the outer layer of the resonant cavity;

the microwave column power collector is a Cassegrain antenna; a microwave power column emitted by the emitting end of the microwave power transmission system is intercepted by a microwave column power collector and is sent to a microwave radiation horn and a resonant cavity to heat a microwave heating medium in the resonant cavity; the Stirling engine is provided with a cold air cylinder 12, a heat regenerator 13 and a hot air cylinder 14; the Stirling engine 8 has the characteristics of high efficiency, light weight, no need of air and the like, and is successfully applied to the fields of AIP submarines and aerospace; in order to improve the external thermal efficiency, a heat absorbing sheet is arranged outside a hot cylinder 14 of the Stirling engine 8, the whole body is embedded in a microwave heating medium, and the outer layer of a resonant cavity is insulated by an insulating layer 7; the Stirling engine 8 drives the generator to generate direct current or power frequency output 10, and conversion from microwave to direct current, namely microwave rectification, is completed.

The Stirling engine is an external heat engine, and the improvement of external heat efficiency is one of the key points of the technology. The two cylinder sleeves keep good isothermal heat transfer capability so as to ensure that the gas temperature in the cylinders is respectively constant (isothermal). Much of the heat is lost through direct transfer and thermal radiation due to the high temperatures maintained over time. Therefore, the utility model takes a series of measures to reduce the external heat energy loss: the microwave column power collector 1 is a Cassegrain antenna, has high efficiency and feedback performance, and the frequency and polarization of the antenna are matched with those of a microwave column; the sizes and polarizations of the microwave radiation horn and the resonant cavity are matched with the microwave column power collector 1; the microwave heating medium and the container in the resonant cavity are made of high-temperature materials, such as cheap rapeseed oil and glass fiber reinforced plastics; in order to further reduce heat loss, an insulating layer is additionally arranged outside the resonant cavity, so that the collected microwave power is maximally used for heating a hot cylinder of the Stirling engine.

In addition, in high-power application, safety devices such as a safety valve, an oil temperature meter and the like are suggested to be additionally arranged on the microwave resonant cavity.

finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. A microwave to dc conversion system, comprising: the system comprises a microwave column power collector, a resonant cavity, a microwave radiation horn, a microwave heating medium, a heat insulation layer, a Stirling engine, a direct current or power frequency generator and a connecting flange;

A microwave heating medium is arranged in the resonant cavity;

an insulating layer is arranged on the outer layer of the resonant cavity;

2. a microwave to dc conversion system according to claim 1, wherein: and a heat absorbing sheet is arranged outside the Stirling engine to improve the external thermal efficiency of the Stirling engine.

3. A microwave to dc conversion system according to claim 1, wherein: the microwave column power collector is a Cassegrain antenna, and the frequency and the polarization of the Cassegrain antenna are matched with those of the microwave column;

4. A microwave to dc conversion system according to claim 1, wherein: the resonant cavity is provided with a safety valve and an oil temperature meter.