JPH1026408A - Fluid heating device - Google Patents

Abstract

(57) Abstract: A fluid can be instantaneously heated to a high temperature because it is easy to manufacture and has excellent heat transfer efficiency to the fluid. An alumina tube (11) through which a fluid to be heated flows is provided in a flow path (20) through which the fluid flows. The tube 11 is filled with a fluid passage layer 12 made of metal cutting waste that is a dielectric so that a fluid can flow therethrough. The tube 11 is disposed inside an induction coil 13 to which a high-frequency current is applied, and the induction coil 13 surrounds the tube 11. When a high-frequency current is applied to the induction coil 13, the dielectric fluid passage layer 12 is heated by electromagnetic induction heating, and the fluid is heated to a high temperature while the fluid passes through the fluid passage layer 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid heating device capable of instantaneously and efficiently heating a fluid object such as water, medicine, food and the like.

[0002]

2. Description of the Related Art Various devices for heating water or the like by high-frequency induction heating have been proposed. For example, Japanese Patent Application Laid-Open No. 5-272
No. 807 discloses an electric water heater in which a heat exchanger is heated by a heating means constituted by a high-frequency electromagnetic induction coil, and the heat exchanger heats a pipe through which a fluid circulates.

[0003] In such an electric water heater, a tube is heated by a high-frequency electromagnetic induction coil, and water inside the tube is heated by the heated tube. Therefore, the water flowing through the pipe cannot be instantaneously heated to a high temperature over the entirety, and the water must be heated while the water is stopped in the heated pipe. As a result, there is a problem that it takes a long time to heat water to a high temperature.

Japanese Patent Application Laid-Open No. Sho 59-170641 discloses a fluid heating device in which a heat exchanger made of a derivative is provided in a tube constituting a fluid passage, and a heating coil is embedded in a wall surface of the surrounding tube. It has been disclosed. In the fluid heating device having such a configuration, the heat exchanger configured by the dielectric is
When a fluid flows through the tube while being heated by the heating coil, the fluid is instantaneously heated by coming into contact with a dielectric heat exchanger.

[0005]

However, in such a fluid heating device, the heating coil is embedded in the wall of the tube so as to surround the dielectric heat exchanger disposed inside the tube. Therefore, there is a problem that the arrangement of the heating coil is not easy. In addition, the dielectric heat exchanger is integrally formed in a star-shaped cross section, and the fluid flows around it, so that the contact area with the fluid is small. Therefore, there is also a problem that the efficiency of heat transfer to the fluid is low, and thus the flowing fluid cannot be efficiently and instantaneously heated over the entirety. Furthermore, since the integrated heat exchanger is supported in the pipe by a plurality of suspension legs, it is not easy to arrange the heat exchanger in the pipe.

When the surface area of the heating element is small, such as a sheathed heater, bumping occurs even when a large amount of electric power is supplied in a short time. Therefore, electric energy is efficiently transmitted to the fluid to be heated. There is also a problem that can not be.

The present invention solves such a problem, and its object is to heat the fluid instantaneously because it is easy to manufacture and has excellent heat transfer efficiency to the fluid. It is an object of the present invention to provide a fluid heating device that can perform the heating.

[0008]

SUMMARY OF THE INVENTION A heating device according to the present invention comprises a non-dielectric tube arranged so that a fluid to be heated flows therethrough, and a fluid flowing into the tube can pass therethrough. A fluid passage layer that is configured to allow fluid to pass through the dielectric and is filled in the tube, and is disposed so as to surround the tube.When a high-frequency current is applied, the fluid is induced by electromagnetic induction. And an induction coil for heating the passage layer.

[0009] The fluid passage layer is made of metal waste or activated carbon.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a main part showing an example of an embodiment of a fluid heating device of the present invention. The fluid heating device includes a pipe 11 disposed in a flow path 20 through which a fluid to be heated flows, and a fluid passage layer 1 filled in the pipe 11.
2 and an induction coil 13 arranged to surround the tube 11.

The pipe body 11 is disposed between a pair of flow pipes 21 constituting the flow path 20, and is made of, for example, a non-dielectric alumina straight tube having an inner diameter of 17 mm, an outer diameter of 22 mm, and a length of 150 mm. Is configured. Each end of the pipe 11 is provided with a receiving port 11a, and each end of each flow pipe 21 is fitted and connected to each receiving port 11a.

The tube 11 may be made of a non-dielectric material, and is not limited to alumina, and may be made of ceramic or the like.

A fluid passage layer 12 arranged in a tube 11
Is filled with the dielectric material so that the fluid to be heated can pass therethrough, and is filled in the tube 11. The fluid passage layer 12 is formed by solidifying, for example, stainless cuttings to such an extent that a fluid can pass through and filling the inside of the tube 11. The fluid passage layer 12 is designed so that the flow of the fluid in the flow path 20 is not hindered, and the dielectric layer is formed so that the contact area between the dielectric and the fluid flowing in the tube 11 is increased. It is necessary that the surface area of the body is large, and in addition to solidified metal chips such as stainless steel as described above, porous activated carbon is formed into a layer and filled in the tube 11 to form a structure. You may.

The induction coil 13 has, for example, an inner diameter of 4 mm,
A copper tube having an outer diameter of 6 mm is wound seven times so as to form a coil having an inner diameter of 30 mm.

A high frequency current is applied to the induction coil 13 by a high frequency oscillating unit shown in FIG. The dielectric coil 13 is connected in series with the resonance capacitor 16 to form a secondary circuit of the transformer coupling circuit 17. A current transformer 14 is provided in a secondary circuit of the transformer coupling circuit 17.

The primary circuit of the transformer coupling circuit 17 is provided with an inverter 19 having a full-bridge type semiconductor switching element 18.
, For example, an alternating current is amplified and input. The current transformer 14 provided in the secondary circuit of the transformer coupling circuit 17 and the inverter 19 provided in the primary circuit of the transformer coupling circuit 17 are controlled by the power control circuit 15.

This high-frequency generating section has a frequency of 50 or 60 Hz.
Is converted to a high frequency of 400 KHz and applied to the induction coil 13.

In the fluid heating device having such a configuration, when a high-frequency AC current is applied to the induction coil 13 by the resonance circuit of the high-frequency oscillation unit, the tubular body 1 is actuated by electromagnetic induction.
An eddy current is generated in the dielectric material constituting the fluid passage layer 12 filled in 1, and the fluid passage layer 12 is heated by Joule heat. In such a state, when a fluid to be heated, such as water, is flown into the flow path 20, the fluid flows into the fluid passage layer 12.
Is heated while contacting the dielectric material constituting the fluid passage layer 12.

Typically, 5 kW of electrical energy is about 12
When water is flowed at a flow rate of 3.6 L / min as a fluid to be heated to be converted into thermal energy of 00 cal / s, the temperature is increased by about 20 ° C. per second. Therefore, the heating device of the present invention can be suitably used for a water heater that heats water instantaneously.

The fluid heating apparatus of the present invention is not limited to a configuration in which water is used as a fluid to be heated, such as a water heater, but can be suitably used for heating fluids such as chemicals and foods. .

[0022]

As described above, the fluid heating device according to the present invention has the following features.
Since the fluid passage layer constituted by the dielectric is filled in the tube, and the tube is arranged in the induction coil, the fluid passage layer can be easily arranged in the tube and can be easily arranged. Can be manufactured. Moreover, the fluid passage layer has a large contact area with the fluid flowing through the pipe body, and the entire fluid can be instantaneously heated to a high temperature by the fluid passage layer heated by the induction coil. improves.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of a fluid heating device according to the present invention.

FIG. 2 is a circuit diagram showing an example of a high-frequency oscillator of an induction coil of the fluid heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Tube 12 Fluid passage layer 13 Induction coil 14 Current transformer 15 Power control circuit 16 Resonant capacitor 17 Transformer coupling circuit 19 Inverter

Claims (3)

[Claims] 1. A non-dielectric tube arranged so as to allow a fluid to be heated to flow therethrough, and a dielectric made of a dielectric so that the fluid flowing into the tube can pass therethrough. A fluid-passing layer filled in the lever body, and an induction coil arranged to surround the tube and heating the fluid-passing layer by electromagnetic induction when a high-frequency current is applied. A fluid heating device. 2. The fluid heating device according to claim 1, wherein the fluid passage layer is made of metal chips. 3. The fluid heating device according to claim 1, wherein the fluid passage layer is made of activated carbon.