JPH0451487A - Steam generator by electromagnetic induction heating - Google Patents

Abstract

PURPOSE:To obtain a heating gas for water vapor, etc., effectively and stably from a small device by winding a conductive wire on a Fe core, forming an induction coil, furnishing on the core a vapor generating trough equipped with a metal substance whose bottom can work as a path for magnetic flux, and connecting AC power supply of commercial frequency with this induction coil formed. CONSTITUTION:An induction coil 12 is wound on a leg core of iron 11, and a yoke core of iron 13 is joined under this leg core 11, and a Fe plate 14 is placed on the leg core 11. When AC power supply of commercial frequency is connected with this induction coil as a heater element 10, magnetic flux is generated on the cores 11, 13, and also magnetic flux passes through the Fe plate 14, and thereby Joule's heat is generated which heats the Fe plate 14. By welding or the like, a vapor generating trough 21 made of stainless steel is consolidated onto the Fe plate 14 equipped with a rust preventive layer 15. The water vapor generated on the Fe plate 14 gets rid of liquid by a gas/ liquid separator plate 28, and saturated vapor is exhausted to outside from a vapor exhaust hole 30 via a needle valve 29.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel electromagnetic induction steam generator that can stably heat a fluid such as water or an organic solution to a predetermined temperature.

[Prior Art] Water vapor is useful as a heat source because it has a large latent heat or heat of condensation. In particular, steam is used in boilers, central heating systems, heating sources for various factory machinery and equipment, irons,
It is useful in various fields such as food steamers. The pond steam is used for various purposes.

Conventionally, steam can be obtained by burning fuel such as oil, gas, or coal, heating steam piping arranged in a shell-and-tube heat exchanger, and simultaneously applying pressure to produce saturated steam, or It was obtained by heating steam pipes with combustion gas or electric resistance heaters.

[Problem to be solved by the invention] However, when oil, coal, natural gas, etc. are burned and used in boilers, etc., a combustion furnace is required, making it difficult to downsize and also impossible to move. . In addition, it is necessary to take safety measures such as fire and disaster prevention measures, and because the temperature difference between the heated part and the water or steam of the heated object is too large, so-called scale may adhere, reducing the heat transfer coefficient. The problem is that the tube will eventually break. For this reason, the water supplied to the boiler is degassed using chemical agents (
It is necessary to carry out scale prevention treatment in advance by deoxidizing) or maintaining alkalinity.

Also, when an electric resistance heater is placed in water, it will be heated to a temperature much higher than the boiling point of water (1000C) near the heat source, so using a heater that does not have sufficient interfacial heat transfer surface area may cause various problems. Occur.

Moreover, electric resistance heaters, like gas combustion,
Because the temperature difference between the heating source and the water is so large, inorganic and organic components contained in the water are adsorbed and deposited on the surface of the heater, which acts as an insulator and reduces heat transfer. Water boils poorly. At the same time, the heat dissipation of the heater also deteriorates, leading to an accident in which the heater eventually breaks.

In order to avoid this accident, water heaters have a large surface area and are filled with water tanks, which has traditionally been a problem in terms of reliability and the complexity of replacing the heater. Another problem was that it took a lot of effort to clean due to the adhesion of limescale and the like.

A further problem that cannot be fundamentally improved is that it is difficult to accurately control the temperature of water vapor.

SUMMARY OF THE INVENTION In order to solve the problems of the prior art described above, an object of the present invention is to provide a steam generator that can efficiently and stably obtain heated gas such as water vapor using a small-sized device.

[Means for Solving the Problems] In order to achieve the above object, the electromagnetic induction steam generator of the present invention has the following configuration.

(1) A conductive wire is wound around an iron core to form an induction coil, a steam generation tank is provided above the iron core with a metal material whose bottom surface can serve as a magnetic flux path, and a steam generation tank is provided with a metal material whose bottom surface can serve as a magnetic flux path. An electromagnetic induction steam generator comprising a supply means and a means for taking out heated gas from the steam generation tank, and a means for connecting an AC power source of a commercial wave number to the induction coil.

(2) The electromagnetic induction steam generator according to the first aspect, wherein the supply fluid is water and the inner surface of the steam generation tank is made of a rust-preventing material.

(3) The electromagnetic induction steam generator according to the first aspect, wherein a gas-liquid separation means is provided in the steam generation tank.

(4) The electromagnetic induction heating steam generator according to the above-mentioned item 1, further comprising means for maintaining a constant temperature even in a dry cooking state in which no supply fluid is supplied.

[Function] According to the configuration of the present invention, an induction coil is formed by winding a conductive wire around an iron core, and a metal material whose bottom surface can serve as a magnetic flux path is provided on the iron core, so that the induction coil When a commercial wavenumber AC power source is connected to the AC power source, low voltage and large current flow through the metal material on the bottom of the steam generation tank, which can serve as a magnetic flux path, due to the so-called transformer principle, and this large current causes the metal material on the bottom of the tank to Joule heat is generated and heating is performed efficiently. Since the supplied water directly contacts and heats the metal material that is the heating body, heat transfer efficiency can be increased. Furthermore, since electricity is used as the heat source, it is safe in terms of disaster prevention, temperature control is easy, and heated steam can be stably obtained with a simple device without the need for a pressure vessel.

Next, according to a preferred embodiment of the present invention, since the supply fluid is water and the inner surface of the steam generation tank is made of a rust-preventing material, it is possible to prevent rust from forming inside the tank when steam is generated. can.

Next, according to a preferred embodiment of the present invention, since the vapor-liquid separation means is provided in the steam generation tank, it is possible to efficiently prevent liquid moisture from being entrained in the obtained steam.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a sectional view of the overall diagram of the electromagnetic induction steam generator, Figure 2 is a diagram showing the principle of the electromagnetic induction heater 10 in Figure 1, and Figure 3 shows the electromagnetic induction heater 10 in Figure 1. FIG. 4 is an external view of the wiring diagram, FIG. 5 is a cross-sectional view taken along line CC in FIG. 4, and FIG. 6 is a cross-sectional view taken along line A-A in FIG. 4. Furthermore, the 6th
This is the BB sectional view of the figure or the electromagnetic induction heater 10 of FIG.

First, to explain the principle from the principle diagram shown in FIG. Place (.

Here iron core 11. For example, a laminate of silicon steel plates or a laminate of amorphous metal films, which are usually used as the iron core of a transformer, can be used. The conductive wire forming the induction coil 12 may be, for example, a copper wire coated with glass fiber.

The yoke core 13 is, for example, a laminate made by laminating a large number of silicon steel plates into a disk shape. The iron plate 14 is used to form a magnetic flux path and serve as a heating element.

Therefore, any material other than iron plates may be used as long as it can flow magnetic flux and become a heat generating element. When a commercial wave number AC power source is connected to the induction coil of this heater 10, magnetic flux is generated in the iron core 1, 1, 13, and magnetic flux also flows inside the iron plate 14, thereby generating Joule heat and causing the iron plate 1.
4 is heated.

A preferred method of connecting the heater 10 is to connect the six coils A] to A6 in a double delta connection using a three-phase AC power source, as shown in FIG. In this way, a suction force will work between the leg iron core 1-1 and the iron plate 14,
Abnormal noise caused by vibration can be prevented.

In FIGS. 4 and 5, 18 is a terminal for connecting a three-phase power source. In addition, in FIGS. 4 and 5, resin mold 1
．． 6 is not necessarily essential, improving safety,
The resin mold 1-6 is preferable because it has the advantage of being able to protect the device from the environment such as steam and dust in the air, and because of its good appearance.

A steam generator 20 using the heater 10 configured as described above will be explained based on FIG. 1.

First, attach the electromagnetic induction heater 1.0 and the iron plate 14 with bolts 1-7.
Fix it with. It is preferable that a layer of stainless steel (for example, 5US-316) be provided on the surface of the iron plate 14 as a rust prevention layer 15. In this example, SUS-31,6
were integrated with a thickness of 1 mm.

Any other layer may be used as long as it can prevent rust, such as glass lining or fluororesin coating.

A steam generating tank 21 made of stainless steel (for example, 5US-316) is integrated onto the iron plate 14 provided with the anti-rust layer 15 by welding or the like. This steam generation tank 21 has a flange portion 31
It is divided into a body and a lid. By opening the flange, scale that accumulates in the tank can be easily removed. The steam generation tank 21 is provided with a pressure gauge 22 and a safety valve 23. Then, water is supplied from the water supply port 24 to the iron plate 14 provided with the rust prevention layer 15 through the water injection hole via the check valve 26 by the pump 25 . The iron plate 14 is always 150 ~
Since it can be heated to 200'C, steam is generated instantly depending on the amount of water supplied.

The water vapor generated on the iron plate 1-4 is separated into liquid by the gas-liquid separation plate 28, and the saturated vapor is discharged to the outside from the vapor outlet 30 through the needle valve 29.

Steam generation tank 21. The capacity is about 8 liters and the amount of water supplied is 1
-5 liters/hr, the internal pressure is approximately 1 kg/cnf in gauge pressure (approximately 2 kg/cnr in absolute pressure)
), saturated steam at about 109°C can be stably obtained. This steam generator will not be damaged even if it is run dry because the temperature of the device is controlled. Also, iron plate 1-
The temperature can be maintained at a constant temperature using the temperature control in step 4, but
When there is no water supply, 10-20% of the power during normal operation
I can drive. Moreover, since the overall size is about 30 cm in diameter and 40 to 50 cm in height, it is easy to move.

If mobile, the water supply is preferably of the cartridge type.

In the device of the present invention, for example, 200 Hz of commercial frequency of 50 Hz or 60 Hz is applied to the induction coil on the negative side.
When an alternating current of 9KW is applied, due to the principle of a transformer, the iron plate on the secondary side has, for example, 0. A current of 5V and 10,000A flows. Low voltage, high current is most important for heating, and the present invention applies this principle to its brother. Further, since only an extremely low voltage flows through the iron plate 1, an electric shock will not occur even if it comes into contact with a human body.

In the above, even if the alternating current is at a frequency other than the commercial frequency,
] A low frequency alternating current of about -000 Hz or less can be used efficiently.

Further, in the above, the thickness of the leg core and the yoke core is such that the magnetic flux density can be maintained at a level that does not reach magnetic saturation, and preferably has a cross-sectional area that can be maintained at 20,000 Gauss or less.

5 Q Hz for the electromagnetic induction heater 10 explained above.

A current was applied from a three-phase AC power source of 200 cm and 9 KW. A current value of 0.5V and 10.0OOA for the iron plate 1-4 can be predicted from calculation of the power value on the primary side. This device takes 2 minutes in 4 minutes.
The temperature can be raised up to 00'C. Thereafter, the temperature was maintained at a constant temperature of 200°C, and water at 25°C was supplied at a rate of 15 liters/1]r. As a result, the corresponding amount of water vapor could be extracted quantitatively.

Of course, the steam generator may be kept warm as a whole to prevent heat radiation.

According to the embodiments of the present invention described above, the following advantages are achieved.

■ Steam at a predetermined temperature can be obtained stably and quickly. It is especially useful as a small boiler.

■ The equipment cost is low, and since it is not a pressure vessel, there is no need for complicated pressure vessel approvals.

■ Since the device is small and uses electricity, it can be moved freely and quickly moved to the required location for use. Therefore, it can also be made into a wagon type. Also, the electricity cost is much lower than that of a resistance heater.

■ The device is compact and can be operated whenever and wherever needed, so it is useful, for example, for steamers that are only used during certain seasons.

■ The temperature of the device is controlled even if you run it dry, so there is no chance of damage.

■ Since it uses electricity, it is highly safe as a heating source.

■ It is useful for steamers and food-related boilers such as tea roasters, boilers such as dye testers, iron steamers, and small boilers for laundry shops and restaurants.

[Effects of the Invention] As described above, according to the steam generator using electromagnetic induction heating of the present invention, a conductive wire is wound around an iron core to form an induction coil, and a bottom surface is placed on top of the iron core. Since it is equipped with a metal material that can act as a magnetic flux path, when a commercial wavenumber AC power source is connected to the induction coil, low voltage and large current flow through the metal material that can act as a magnetic flux path on the bottom of the steam generation tank, based on the so-called transformer principle. Due to this large current, Joule heat is generated on the metal side of the bottom of the tank, and heating is performed efficiently.

Since the supplied water directly contacts and heats the metal material that is the heating body, heat transfer efficiency can be increased. In addition, since electricity is used as the heat source, it is safe in terms of disaster prevention, temperature control is easy, and it has the excellent effect of being able to stably obtain heated steam with a simple device without the need for a pressure vessel. can be achieved.

Next, according to a preferred embodiment of the present invention, since the supply fluid is water and the inner surface of the steam generation tank is made of a rust-preventing material, it is possible to prevent rust from forming inside the tank when steam is generated. can.

Next, according to a preferred embodiment of the present invention, since the vapor-liquid separation means is provided in the steam generation tank, it is possible to efficiently prevent liquid moisture from being entrained in the obtained steam.

Furthermore, since the present invention has a means for keeping the steam generating heater at a constant temperature, there will be no inconvenience such as destruction or damage to the device even in a so-called dry cooking state in which no supply fluid is supplied.

[Brief explanation of drawings]

FIG. 17 is a sectional view of the overall diagram of an electromagnetic induction steam generator according to an embodiment of the present invention, FIG. 2 is a diagram showing the principle of the electromagnetic induction heater shown in FIG. 1, and FIG. FIG. 4 is an external view of the induction heater, FIG. 5 is a cross-sectional view taken along line CC in FIG. 4, and FIG. 6 is a cross-sectional view taken along line A-A in FIG. 4. 1: Iron core, 2: Induction coil, 3: Pipe, 4: Shorting piece,
5: Inlet, 6: Outlet, 10: Electromagnetic induction heater, 11, Leg core, 12: Induction coil, 1-3: Yoke core, 14. Iron plate, 15: Rust prevention layer, 16: Resin mold, 17: Bolt,
18: Terminal, 20: Steam generator, 21・Steam generation tank, 2
2: Pressure gauge, 23: Safety valve, 24: Water supply port, 25: Pump, 26 Check valve, 27: Water injection hole, 28: Gas-liquid separation plate, 29 Needle valve, 30: Steam outlet, 31-, flange part. Figure 2 Figure 3 et al Figure 4 Figure 5 Figure 6 Figure 18: Terminal Procedures Amendment (Mutsu) 1. Display of the case 1990 Patent Application No. 160697 2, Name of invention Nikko Co., Ltd. Representative Netsu Iguchi 4 Address of agent 4-9-2 Hitomi, Kita-ku, Osaka 530 "Invention" in the specification 7. Contents of amendment (1) "A laminate is used. Iron plate 14" on page 7, line 15 of the specification is amended as follows. "A laminate is used. For example, a long silicon steel plate several centimeters wide is rolled up into a cylindrical shape, and the flat part of the cylinder (the end face of the silicon steel plate) is placed in contact with the leg core. Iron Plate 14" (2) "Crawling is preferable." on page 8, line 15 of the specification should be changed to "Crawling is preferable. However, when generating high-temperature steam, a resin mold is not required due to the heat resistance of the resin. It is more preferable.] 5. Number of claims increased by amendment None 6. Subject of amendment

Claims (4)

[Claims] (1) A conductive wire is wound around an iron core to form an induction coil, a steam generation tank is provided above the iron core with a metal material whose bottom surface can serve as a magnetic flux path, and a steam generation tank is provided with a metal material whose bottom surface can serve as a magnetic flux path. An electromagnetic induction heating steam generator, comprising a supply means, a means for taking out heated gas from the steam generation tank, and a means for connecting a low frequency AC power source to the induction coil. (2) The electromagnetic induction heating steam generator according to claim 1, wherein the supplied fluid is water, and the inner surface of the steam generation tank is made of a rust-preventing material. (3) The electromagnetic induction heating steam generator according to claim 1, wherein a gas-liquid separation means is provided in the steam generation tank. (4) The electromagnetic induction heating steam generator according to claim 1, further comprising means for maintaining the temperature at a constant temperature even in a dry cooking state where no supply fluid is supplied.