JP2007152651A - Fluid induction heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heating efficiency by enlarging a contact area between fluid and a heating element and to eliminate the overheat of the fluid or the heating element. <P>SOLUTION: A pipe made of a magnetic substance such as SUS is wound spirally, and flanges 1a are set at both side end parts to form a cylindrical heating container 1 with a spiral fluid passage formed. An induction coil 2 wound onto an insulating bobbin 3 is inserted into the hollow of the heating container 1 to constitute a fluid induction heating device. When it is used, it is connected to a conduit in which the fluid flows through the flange 1a. The fluid flowing in the conduit is lead into the spirally wound pipe of the heating container 1 and passed through the spiral passage. Alternating voltage is applied to the induction coil 2, and the heating container 1 is heated by the alternating magnetic flux. In this way, a heat transmission area between the fluid and a heating element is increased so that the fluid can be heated at a desired temperature without increasing the heating temperature of the heating element. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fluid induction heating device.

  A treatment object such as a resin film is placed on a roller, and the treatment object is heated to a predetermined temperature while passing through the roller, or the high temperature treatment object is deprived to a predetermined temperature. . When heat treatment is performed, the roller is heated to a temperature required for the heat treatment. When heat treatment is performed, the temperature of the roller itself increases due to heat removal from the processed material. Cooling. In either case, a heat medium that transfers heat to the roller is required, and a fluid such as oil may be used as the heat medium.

In this case, a fluid heated to a predetermined temperature in a heating container provided with a linear heating heater is sent into the roll shell by a pump, and after flowing through the roll shell, is discharged to the oil storage tank and is stored in the oil storage tank. It is configured to send fluid into the heating vessel.
JP 2004-195888 A

In the fluid heating by such a linear heating heater, the heat transfer area of the heating heater is small and the temperature transfer of the fluid is slow. Therefore, especially when the flow rate is reduced, the portion in contact with the heating heater There was a problem that the fluid overheated beyond the heat resistance temperature and the heater itself also caused overheating.

The problem to be solved by the present invention is to increase the heating efficiency by increasing the contact area between the fluid and the heating element, eliminate the overheating of the fluid and the heating element, and eliminate such problems.

The present invention includes a cylindrical container having a spiral flow path through which a fluid flows and an induction coil, and the induction coil is disposed in the hollow of the container to generate the induction coil. The main feature is that the container is heated by induction with an alternating magnetic flux, and the fluid flowing through the spiral flow path of the container is heated.

  In the present invention, the entire cylindrical container having a spiral flow path through which fluid flows becomes a heating element by induction heating, and heats the fluid flowing through the entire inner wall of the spiral flow path. The heat transfer area between the fluid and the heating element is large, and the fluid can be heated to a desired temperature without increasing the heating temperature of the heating element. Therefore, by monitoring the temperature of the container itself, it is possible to obtain good control response and easily avoid overheating of the fluid and the heating element.

The purpose of increasing the heating efficiency by increasing the contact area between the fluid and the heating element and eliminating the overheating of the fluid and the heating element is to inductively heat the container that heats the fluid, and to pass the fluid through the container. This was realized by forming a flow path.

  FIG. 1 is an assembled perspective view of a fluid induction heating device according to an embodiment of the present invention. In FIG. 1, 1 is a heating container, 2 is an induction heating coil, and 3 is an insulating bobbin. The heating container 1 is formed into a cylindrical shape as a whole by spirally winding a pipe made of a magnetic material such as SUS, and provided with flanges 1a at both ends, and the fluid flows from one opening end to the other opening. Flow to the end. The induction heating coil 2 is wound around a cylindrical insulating bobbin 3. Then, the induction coil 2 wound around the insulating bobbin 3 is inserted into the hollow interior of the cylindrical heating container 1 to complete the fluid induction heating device.

  The fluid induction heating apparatus configured as described above is connected to a conduit through which a fluid flows through a flange 1a, and guides the fluid flowing in the conduit into a spirally wound pipe of the heating container 1, Let flow through the channel. At this time, when an AC voltage is applied to the induction coil 2, an induction current is generated in the pipe wound in a spiral shape by the alternating magnetic flux generated by the induction coil 2, that is, the heating container 1, and the entire heating container 1 is Joule by this induction current. Fever. This heat generation is transmitted to the fluid flowing through the spiral flow path, and the fluid is heated while flowing through the spiral flow path.

  In addition, in the above Example, although the heating container 1 is comprised by winding one pipe helically, you may wind a several pipe in parallel and helically. Further, the heating container may be formed in a cylindrical shape, and a spiral flow hole along the cylindrical inner peripheral surface may be formed in the cylindrical thickness.

  FIG. 2 shows an example of use of the fluid induction heating apparatus configured as described above. In FIG. 2, 1 is a heating container, 2 is an induction coil, 11 is a roll shell constituting the roller body, and 12 is A rotary drive shaft that rotates by a motor (not shown) to rotate the roll shell, 13 is a core, 14 is a rotary joint, 15 is an oil storage tank, 16 is a fluid (heat medium such as oil), 17 is a pump, 18 is a thyristor, etc. A roll shell surface temperature detector, 20 a fluid temperature detector, 21 a heating container temperature detector, 22 a temperature control circuit, and 23 a rotary transformer.

  The roll shell 11 has a cylindrical shape, and in this example, a sealed chamber 11a along the longitudinal direction and a temperature sensor insertion hole 11b are formed inside the wall thickness, and the surface temperature of the roll shell 1 is detected in the temperature sensor insertion hole 11b. A temperature sensor 19 is disposed, and a gas-liquid two-phase heat medium such as water that equalizes the surface temperature of the roll shell 1 by latent heat transfer is enclosed in the sealed chamber 11a. And the core 13 is arrange | positioned in the hollow inside, and the flow path 13a of the heat medium is formed through the center part of the core 13. The heat medium flow passage 13 a is connected to the inlet of the rotary joint 4 through the rotary drive shaft 12, and the heat medium flow formed between the inner peripheral wall of the roll shell 11 and the outer peripheral wall of the core 13. The path 11 c is connected to the outlet of the rotary joint 14 through the rotary drive shaft 12. The heat medium may flow from one end of the roll shell 1 to the other end.

The heat medium 16 of the oil storage tank 15 passes through the spiral flow path of the heating container 1 and is heated to a predetermined temperature. The heat medium 16 is sent into the roll shell 11 by the pump 17, and the heat medium flow path. 13a and 11c flow through and are discharged to the oil storage tank 5. The roll shell 11 is heated by this flow, and the processed material that contacts the surface of the roll shell 11 is heated. The temperature detected by the temperature sensor 19 during the heat treatment and the temperature detected by the temperature sensor 20 are input to the temperature control circuit 22 and appropriately compared with the target values S1 and S2, and a control signal corresponding to the deviation is sent to the power control circuit 18. The current flowing through the induction heating coil 2 is controlled, and the temperature of the heating container 1 is controlled. The temperature detected by the temperature sensor 22 is sent to the power control circuit 18 to monitor the temperature of the heating container 1.

  The roll shell 11 in this use example includes a sealed chamber 11a in which a gas-liquid two-phase heat medium is enclosed, and the influence on the surface temperature of the roll shell 11 due to the temperature difference between the heat medium 16 at the inlet and the outlet. The flow rate of the heat medium 16 flowing through the roll shell 11 is small, that is, the diameter of the flow path of the heat medium 16 of the heating container 1 can be reduced, and the heat of the heating container 1 is transferred to the entire heat medium 16. Since it is transmitted quickly and can follow the desired temperature of the heat medium 16 without increasing the temperature of the heating container 1 more than necessary, the fluid induction heating device of the above embodiment can be effectively used.

It is an assembly perspective view of the fluid induction heating device concerning the example of the present invention. It is a block diagram of the heat medium flow roller apparatus which shows the usage example of the fluid induction heating apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating container 2 Induction heating coil 3 Insulating bobbin 11 Roll shell 11a Sealed chamber 11b Temperature sensor insertion hole 12 Rotation drive shaft 13 Core 13a Heat medium passage 14 Rotary joint 15 Oil storage tank 16 Heat medium (fluid)
17 Pump 18 Power control circuit 19, 20, 21 Temperature detector 22 Temperature control circuit 23 Rotary transformer

Claims (2)

  A cylindrical container having a spiral flow path through which a fluid flows, and an induction coil, the induction coil is disposed in the hollow of the container, and the alternating magnetic flux generated by the induction coil A fluid induction heating apparatus characterized by heating a fluid flowing through a spiral flow path of the container by induction heating the container.   The heated fluid is flowed through the inside, and the processed material abutting on the surface is used as the fluid heating device of the roller for heat-treating with the heated fluid flow. Fluid induction heating device.

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