JP2007168223A - Fluid heating device and heat medium circulation roller device using the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control heat discharged outside from a heating container and to improve heat efficiency by improving the magnetic combination between a primary coil and the heating container in a fluid heating device comprising the heating container having a fluid circulation passage functioning as a secondary coil which is wound on the periphery of the primary coil wound on an iron core. <P>SOLUTION: In the fluid heating device, one part 15a of the primary coil is wound on the iron core 14, a heat insulating member 16 is laid on the periphery of the primary coil 15a, a secondary coil (heating container) 1a comprising a pipe in which fluid is circulated is wound on the periphery of the heat insulating member 16, the insulating member 16 is laid on the periphery of the secondary coil 1a, the other part 15b of the primary coil is wound on the periphery of the heat insulating member 16, and both ends of the secondary coil 1a are short-circuited electrically. In this way, the magnetic combination between the secondary coil 1a and the primary coils 15a and 15b is improved, a leak impedance is reduced, and a powder factor is improved. The heat generation by the resistance loss of the primary coils 15a and 15b can be transmitted from both surfaces of the secondary coil (heating container)1a to reduce the cooling speed of the heating container to improve the heat insulating effect. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fluid heating device and a heat medium flow roller device using the 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, the fluid serving as the heat medium is heated to a predetermined temperature in a heating container provided with a linear heater, and is sent to the roll shell by a pump, flows through the roll shell, and then to the oil storage tank. The fluid stored in the oil storage tank is discharged and sent to the heating container.
JP 2004-195888 A

  However, in the fluid heating by such a linear heater, since the heat transfer area of the heater is small and the temperature transfer of the fluid is slow, the heater contacts the heater particularly when the flow rate is lowered. Since the fluid of the part exceeds the heat resistant temperature and overheats, and the heater itself may cause overheating, the pipe through which the fluid flows is spirally wound to form a heating container, and the spiral pipe It has been proposed to heat itself by energization (Japanese Patent Application No. 2005-320604).

  FIG. 2 shows a configuration of a heat medium flow roller device using a fluid heating device that heats the spiral pipe itself by energization. In FIG. 2, reference numeral 1 denotes a fluid as a heat medium. A fluid heating device 2 includes a heating container 1a in which a pipe to be flowed is spirally wound, and 2 is a cylindrical roll shell constituting a roller body. The fluid heated to a predetermined temperature by the fluid heating device 1 is driven between the rotary joint 4, the through passage 5 a at the center of the core 5, and the inner wall of the roll shell 2 and the core 4 by driving the pump 3. The oil is discharged to the oil storage tank 6 through the flow path 2 a and the rotary joint 4 in order, and the fluid 7 in the oil storage tank 6 is sent to the fluid heating device 1. The roll shell 2 is heated by the flow of the heating fluid in the roll shell 2, and the processed material that contacts the surface of the roll shell 2 is heat-treated by this heating.

  A plurality of sealed chambers 2b are formed in the wall thickness of the roll shell 2 along the longitudinal direction (the direction in which the fluid flows), and the surface temperature of the roll shell 2 is made uniform in the sealed chamber 2b by latent heat transfer. In other words, a gas-liquid two-phase heat medium such as water that reduces the influence of the temperature difference between the upstream and downstream of the fluid by moving the latent heat is enclosed, and the temperature sensor insertion hole 2c is formed to insert the temperature sensor. A temperature sensor 8 for detecting the temperature of the surface of the roll shell 2 is inserted into the hole 2c. The temperature detected by the temperature sensor 8 is taken out through the rotary transformer 9 and input to the temperature control circuit 10. The temperature control circuit 10 detects the temperature detected from the temperature sensor 11 that detects the temperature of the fluid flowing into the roll shell 2. The two detected temperatures are appropriately compared and sent to the power control circuit 12 to control the power supplied to the fluid heating device 1. Reference numeral 13 denotes a temperature sensor that detects the temperature of the heating container 1a and controls the maximum power supplied to the fluid heating apparatus 1.

  The fluid heating device 1 has a (closed magnetic path) iron core 14 and a primary coil 15 wound around the iron core 14 as shown in a cross section on one side of FIG. It consists of a cylindrical heating container 1a in which a flowing pipe is wound spirally. The heating container 1a functions as a secondary coil, and both ends are electrically short-circuited. When an AC voltage is applied to the primary coil 15 due to this short circuit, a short circuit current flows in the heating vessel 1a of the secondary coil, and the heating vessel 1a generates resistance heat by that current, and the heat passes through the pipe of the heating vessel 1a. The fluid is heated and transmitted to the flowing fluid. In this case, since the heating container 1a as a whole is a heating element, the contact area between the fluid and the heating element is wide, heat transfer characteristics are improved, and overheating of the fluid and the heating element can be eliminated.

However, the magnetic leakage between the primary coil and the heating container of the secondary coil is large, the heating efficiency is inferior, and the heat of the outer surface of the heating container of the secondary coil is easily released from the surface to the outside. There was a problem of high speed.

The problem to be solved by the present invention is a fluid heating apparatus comprising a heating container having a fluid passage that functions as a secondary coil wound around the outer periphery of a primary coil wound around an iron core. It is in the point which suppresses the heat | fever discharge | released to this and improves the magnetic coupling of a primary coil and a heating container, and eliminates such a problem.

The present invention has a closed magnetic circuit core, a primary coil wound around the iron core, and a secondary coil wound with a conductor formed with a through hole through which fluid flows, and both ends of the secondary coil are In the fluid heating apparatus in which the heat generated by the current flowing through the shorted secondary coil is transferred to the fluid flowing through the through hole, the primary coil is divided into two layers, and the 2 The main feature is that the secondary coil is arranged between the primary coils of the layers.

  In the present invention, since the secondary coil having the fluid passage is used as a heating element, the heat transfer area between the fluid and the heating element is large, and the fluid is heated to a desired temperature without increasing the heating temperature of the heating element more than necessary. The primary coil is divided into two layers, and the heating container of the secondary coil is disposed between the two divided layers, so that the magnetic coupling with the primary coil is improved and the heating efficiency is increased. be able to. Further, heat generated by the resistance loss of the primary coil can be transmitted from both surfaces of the heating element of the secondary coil, and effective use of the heat of the primary coil can be achieved.

In a fluid heating apparatus comprising a heating container having a fluid passage that functions as a secondary coil wound around the outer periphery of a primary coil wound around an iron core, heat released from the heating container to the outside is suppressed, and The purpose of improving the magnetic coupling between the primary coil and the heating container was realized by dividing the primary coil into two layers and arranging the secondary coil between the two layers.

  FIG. 1 is a one-side cross-sectional view of a fluid heating apparatus according to an embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part corresponding to the fluid heating apparatus shown to FIG. 2 and FIG. In the fluid heating apparatus of this example, the primary coil is divided into two parts 15a and 15b, and a hollow helical secondary coil heating container 1a is arranged through an insulating and heat insulating member 16 therebetween.

  That is, a part 15a of the primary coil is wound around the iron core 14, the insulating and heat retaining member 16 is superimposed on the outer periphery of the primary coil 15a, and the secondary coil 1a made of a pipe through which fluid flows is wound around the outer periphery. The insulating and heat insulating member 16 is overlapped on the outer periphery of the secondary coil 1a, and another part 15b of the primary coil is wound around the outer periphery of the insulating and heat insulating member 16 to electrically short-circuit both ends of the secondary coil 1a. Configured.

  When the fluid heating device configured as described above is used as the fluid heating device of the heat medium flow roller device shown in FIG. 2, when an AC voltage is applied to the primary coils 15a and 15b, the secondary coil heating container 1a is used. A short-circuit current flows through the heating container 1a, and the heating container 1a generates heat with resistance. The heat is transmitted to the fluid flowing through the pipe of the heating container 1a, and the fluid is heated. In this case, since the entire heating container 1a becomes a heating element, the contact area between the fluid and the heating element is wide, heat transfer characteristics are improved, and while maintaining the effect of eliminating overheating of the fluid and the heating element, 2 The magnetic coupling between the secondary coil 1a and the primary coils 15a and 15b is improved, the leakage impedance is reduced to about half, the power factor is 90 to 97%, which is improved by 2 to 10% compared to the prior art, Heat generated by resistance loss of the secondary coils 15a and 15b can be transmitted from both sides of the heating vessel of the secondary coil 1a, the cooling rate of the heating vessel can be reduced, the heat retention effect can be increased, and the temperature fluctuation of the fluid can be quickly Can respond.

It is a single side sectional 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. It is a single side sectional view of the conventional fluid induction heating device.

Explanation of symbols

1 Fluid heating device 1a Heating container (secondary coil)
2 Roll shell 2a Sealed chamber 3 Pump 4 Rotary joint 5 Core 6 Oil storage tank 7 Fluid 14 Iron cores 15a, 15b Primary coil

Claims (3)

  A closed magnetic circuit iron core, a primary coil wound around the iron core, and a secondary coil wound with a conductor formed with a through-hole through which fluid flows, and both ends of the secondary coil are electrically connected to each other In the fluid heating apparatus in which the heat generated by the short-circuited current flowing in the short-circuited secondary coil is transmitted to the fluid flowing through the through-hole, the primary coil is divided into two layers, and the primary of the two layers A fluid heating apparatus, wherein the secondary coil is disposed between coils.   The fluid heating apparatus according to claim 1, wherein an insulating heat insulating material is disposed between the primary coil and the secondary coil.   The fluid heating device according to claim 1 or 2 is disposed in a circulating fluid path, the fluid heated by the fluid heating device is passed through a roller to heat the roller with the heated fluid, and A heat-medium flow roller device characterized by heat-treating a processed material that contacts the surface of the roller.

Images