JP2015013266A - Pressure wave generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and safe pressure wave generator.SOLUTION: A pressure wave generator includes a container 1 injected with a medium capable of transmitting pressure waves, an object 2 arranged in the medium of the container 1, a to-be-heated object 3 with a liquid sealed arranged in the medium of the container 1, and heating means consisting of an antenna part 4 for heating the liquid in the to-be-heated object and a microwave generation part 5. The to-be-heated object is vapor-exploded by heating the liquid in the to-be-heated object to generate a pressure wave, and the pressure wave can be applied to the object 2. The pressure wave generator is thus small-sized and safe.

Description

  The present invention relates to a pressure wave generator that applies a pressure wave generated by steam explosion of an object to be heated toward an object.

  2. Description of the Related Art Conventionally, a pressure wave generator that generates pressure waves in water and applies sterilization by applying pressure waves to powder has been proposed (for example, Patent Document 1). In conventional pressure wave generators, pressure waves can be generated in water using a method of discharging electrical energy stored in a capacitor between electrodes, a method of entering a high-speed moving object into water, or using explosives. In the air, there are generation methods mainly using explosives and shock tube.

JP 2003-38141 A

  However, in the method of discharging electric energy between the electrodes, a charging voltage of several KV and a large-capacity capacitor for storing energy are required, so that there is a problem that the apparatus becomes large and expensive. Moreover, the method of discharging by disposing a metal in a liquid has a problem in terms of environment and safety such as treatment of waste liquid because a metal component is eluted in the liquid. The method using explosives has problems in terms of use place restrictions and safety, and is difficult to spread widely in ordinary households.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a small and safe pressure generator.

  In order to solve the conventional problems, a pressure wave generator of the present invention includes a container filled with a medium capable of propagating a pressure wave, an object disposed in the medium of the container, An object to be heated, which is disposed in the medium and encloses a liquid, and a heating means for heating the liquid in the object to be heated are provided.

  According to the present invention, by heating the liquid in the object to be heated, the object to be heated is vapor exploded to generate a pressure wave, and the generated pressure wave can be propagated to the object through the medium. A safe and safe pressure generator can be provided.

Explanatory drawing which shows the structure of the pressure wave generation means using the microwave which concerns on this invention Explanatory drawing which shows the to-be-heated material which concerns on the Example of this invention. Operation flow diagram according to an embodiment of the present invention

  A first invention is a container in which a medium capable of propagating a pressure wave is injected, an object disposed in the medium of the container, a heated object disposed in the medium of the container and enclosing a liquid And a heating means for heating the liquid in the article to be heated.

  As a result, by heating the liquid in the object to be heated, the object to be heated is vapor-expanded to generate a pressure wave, and the generated pressure wave can be propagated to the object through the medium. A pressure generating device can be provided.

  A second invention uses a liquid as the medium in the first invention.

  In a third aspect based on the first aspect, the heating means irradiates microwaves.

  In a fourth aspect based on the third aspect, the object to be heated generates a pressure wave by undergoing a vapor explosion upon receiving a microwave.

  According to a fifth invention, in the third or fourth invention, the heating means has an antenna for propagating microwaves to a medium.

  According to a sixth invention, in any one of the first to fifth inventions, the object is subjected to a pressure wave to cause physical changes such as pulverization, softening, sterilization, and formation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is an explanatory diagram showing a schematic configuration of pressure wave generating means using a microwave according to the present invention.

  The pressure generator includes a container 1 into which a medium capable of propagating a pressure wave is injected, an object 2 that is disposed in the medium of the container 1 and receives the pressure wave, and an object to be heated that is disposed in the medium of the container 1. 3 and an antenna unit 4 and a microwave generation unit 5 which are heating means for heating the article 3 to be heated.

  Specifically, for example, a liquid capable of propagating a pressure wave is used as the medium, and in this embodiment, easily available and inexpensive water is used. The container 1 has a structure that can sufficiently withstand the pressure wave generated inside, and is formed in a shape that efficiently propagates the pressure wave to the object 2.

  The object 2 can be sterilized, crushed, softened, molded, and the like by pressure waves. Specifically, sterilization of foods such as grains, pulverization of rice and beans, softening of vegetables and fruits, molding of metals, and the like can be performed.

  The object to be heated 3 is formed, for example, in a sealed container shape, and a liquid is sealed inside. The object to be heated 3 is vaporized by heating the internal liquid by the microwave from the antenna unit 4 generated by the microwave generating unit 5, and the internal pressure rises to destroy the object to be heated 3. Is generated.

  FIG. 2 shows an example of the object to be heated 3 used in the present embodiment. The object to be heated 3 includes a bottomed cylindrical case portion 31 having one opening, a cover portion 32 that hermetically seals the opening of the case portion 31, and a liquid 33 sealed in the case portion 31. .

The case part 31 and the cover part 32 pass through the liquid and gas, change and dissolve by the liquid and gas, breakage and dissolution when the liquid 33 becomes high temperature, and expansion when the pressure in the article 3 to be heated increases. A material that does not cause such a problem can be used. Moreover, at least one of the case part 31 and the cover part 32 uses the material which a microwave passes. The case part 31 and the cover part 32 are
Even when the pressure in the article to be heated 3 increases due to the temperature of the liquid 33 being raised to vapor, the adhesive force does not cause peeling of the contact surface between the case portion 31 and the cover portion 32 or leakage of vapor. It is glued.

  At least one of the case part 31 and the cover part 32 is formed so as to be destroyed at once when the inside of the article to be heated 3 reaches a predetermined pressure. In this Embodiment, the cover part 32 is formed with the material which is damaged when the inside of the to-be-heated material 3 becomes a predetermined pressure. Specifically, the cover part 32 is formed of cellophane or glass having water resistance. You may form the thin part which is damaged when the inside of the to-be-heated material 3 becomes a predetermined pressure in the case part 31 or the cover part 32. FIG. Although the case part 31 uses polycarbonate in the present embodiment, other materials having the above-described conditions can be used.

  In addition, the to-be-heated material 3 is not restricted to the structure of this Embodiment shown in FIG. 2, You may use foodstuffs, such as an egg, a chestnut, a ginkgo, and a salmon roe. The liquid 33 in the case portion of the object to be heated 3 may be anything as long as it raises the internal pressure of the object to be heated 3 due to the generation of steam and breaks the object to be heated 3 at once, but generates the steam earlier than the medium. Those are preferred. For example, when water is used as the medium in the container 1, it is preferable to use salt water, alcohol, milk, or the like that generates steam earlier than water.

  The antenna unit 4 has a structure that efficiently radiates the microwave generated by the microwave generation unit 5 in the medium of the container 1, and uses, for example, a pole antenna. When water is used as the medium, the antenna unit 4 can efficiently radiate microwaves through a dielectric such as a resin at the boundary between the pole antenna electrode and water. The microwave generator 5 may use a magnetron or a semiconductor used in a microwave oven. The frequency is, for example, 2.4 GHz band, and the higher the power value, the shorter the time for causing the destruction of the heated object 3 by steam. it can.

  The result of experimenting this embodiment using an experimental apparatus will be described.

  In this experimental apparatus, the container 1 uses an aluminum casing, and the inside is filled with water, and a pressure sensor (M109C11 manufactured by PCB) is disposed in the water instead of the object 2. An egg is used as the object to be heated 3, a pole antenna via a silicon resin is arranged in the medium as the antenna unit 4, and the microwave generation unit 5 is output at a frequency of 2.45 GHz and a power value of 200 W. After a minute, the eggs were successfully steam exploded, and a pressure wave of about 10 MPa was observed as a pressure sensor measurement value.

  Next, the operation of the pressure wave generator of the present embodiment will be described with reference to the flowchart of FIG.

  In step S001, the object 2 and the object to be heated 3 that receive the pressure wave are placed in the container 1 containing the medium, and the container 1 is sealed. The object 2 can be sealed in a bag or the like in order to prevent the object 2 from getting wet with water as a medium.

  In step S <b> 002, a microwave is generated from the microwave generation unit 5, and the object to be heated 3 is irradiated with the microwave through the antenna unit 4.

  In step S003, the object to be heated 3 irradiated with the microwave emits heat by the internal water molecules being vibrated by the microwave to generate steam. When the object to be heated 3 reaches a predetermined pressure due to the pressure of the steam, the cover portion 32 is destroyed and a pressure wave is generated. When a food material such as an egg is used as the article to be heated 3, the steam generated inside destroys the film on the outside of the food material, thereby generating a pressure wave. The generated pressure wave is applied to the object 2 through the medium.

  In step S004, the object 2 is crushed, softened, sterilized, molded, and the like by applying a pressure wave to the object 2.

  According to the present embodiment, by irradiating the object to be heated 3 with microwaves, a vapor explosion occurs and a pressure wave is generated, so that a charging voltage and energy of several KV are obtained compared to a method using discharge. A large-capacity condenser or the like is not required, and a compact and low-cost device can be provided, and a safe pressure generating device free from the problem of waste liquid can be provided.

  In the present embodiment, the article to be heated 3 is configured by the bottomed cylindrical case portion 31 and the cover portion 32, but may be formed in a spherical shape or an egg shape. The medium in the container 1 may be air. In addition, the pressure wave in this invention is a general term for an expansion wave, a contraction wave, a shock wave, etc.

  As described above, the present invention is a large-capacity condenser for storing a charging voltage or energy of several KV by generating a vapor wave by irradiating a heated object with a microwave and generating a pressure wave. It is possible to provide a safe pressure generator that can reduce the size, reduce costs, and eliminate waste problems, and can be widely used for various applications such as crushing, softening, sterilization, and molding using pressure waves. Useful for.

DESCRIPTION OF SYMBOLS 1 Container 2 Object 3 Object to be heated 4 Antenna part 5 Microwave generation part 31 Case part 32 Cover part 33 Liquid

Claims (6)

  A container filled with a medium capable of propagating a pressure wave; an object disposed in the medium of the container; a heated object disposed in the medium of the container and enclosing a liquid; and the heated object A pressure wave generator comprising: heating means for heating a liquid in an object.   The pressure wave generator according to claim 1, wherein the medium is a liquid.   The pressure wave generator according to claim 1, wherein the heating unit irradiates microwaves.   The pressure wave generator according to claim 3, wherein the object to be heated generates a pressure wave by receiving a microwave and causing a vapor explosion.   5. The pressure wave generator according to claim 3, wherein the heating unit includes an antenna that propagates microwaves to a medium.   The pressure wave generator according to any one of claims 1 to 5, wherein the object receives a pressure wave to cause physical changes such as pulverization, softening, sterilization, and formation.

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