JP2007210260A - Fluid heating equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide fluid heating equipment which has a fluid passing through the inside, can improve the heating efficiency of the fluid for heating heat treatment equipment, such as a roller, to a predetermined temperature and eliminate the overheating of the fluid and the heating element. <P>SOLUTION: Provided is a tubular heating element 11 that surrounds a coil 12 wound around an iron core 13 and generates heat by the voltage applied to the coil 12. The thick wall of the heating element 11 has a plurality of through holes 11a extending in the longitudinal direction which are employed for passing the fluid to be heated and closed chambers 11c extending in the longitudinal direction inside of the thick wall of the tubular heating element 11 which seal in the insides a heating medium of the gaseous-and-liquid two phases, and the generated heat of the heating element 11 is transferred to the fluid passing through the through holes 11a. Accordingly, the heat transfer surface between the fluid and the heating element becomes larger, the tubular heating element 11 becomes uniform in temperature by the latent heat movement of the heating medium of the gaseous-and-liquid two phases in the closed chambers 11c, and the average temperature of the tubular heating element 11 can be set higher. This enables the use at high temperatures and the highly efficient heating. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fluid heating apparatus that heats a fluid that supplies heat to a heat treatment apparatus such as a roller.

  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.

FIG. 3 shows a schematic configuration of the heat treatment roller device when heated or deprived by such a heat medium. In FIG. 3, 1 is a roll shell constituting the roller body, and 2 is rotated by a motor (not shown). Rotation drive shaft that rotates the roll shell, 3 is a core, 4 is a rotary joint, 5 is an oil storage tank, 6 is a fluid (heat medium), 7 is a heating device, 8 is a pump, 9 is a temperature sensor, and 10 is power control. Circuit. The roll shell 1 has a cylindrical shape, and a plurality of sealed chambers 1a extending in the same direction as the axial direction of the roll shell 1 are formed in the wall thickness, and a gas-liquid two-phase heat medium is formed in each sealed chamber 1a. It is enclosed. In the hollow portion of the roll shell 1, a core 3 having a through hole that forms a medium flow path 3a in the center is disposed.

The heating device 7 includes a heating container 7a and a linear heater 7b, and heats the heat medium 6 in the heating container 7a with the heater 7b. The heated heat medium 6 is sent into the roll shell 1 through the rotary joint 4 by driving the pump 8, and the medium passage 3 a in the center of the core 3 and the outer periphery of the core 3 and the roll shell 1. It is discharged to the oil storage tank 5 via the rotary joint 4 through the medium passage 3b between the inner periphery and the heat medium 6 in the oil storage tank 5 is sent to the heating device 7.

The temperature of the heat medium derived from the heating device 7 is detected by the temperature sensor 9, and the power control circuit 10 is controlled based on this detection signal to control the power supplied to the heating heater 7b, so that the temperature of the heat medium 6 is predetermined. Maintain the temperature at. That is, a heat medium heated to a predetermined temperature is passed through the roll shell 1, the roll shell 1 is heated to a predetermined temperature, and the processed material that is in contact with the surface of the roll shell 1 is heated by the heat. .
JP 2004-195888 A

However, in the conventional heating of fluid by a linear heater, since the heat transfer area between the fluid and the heater is small, the flow rate of the fluid in contact with the heater is reduced when the amount of heat transfer is small and the fluid flow rate is reduced. And the fluid overheats beyond the heat resistance temperature, and the heating responsiveness of the fluid is slow, so that the heater itself overheats.

The problem to be solved by the present invention is to increase the heating efficiency of a fluid for flowing a fluid inside to heat a heat treatment apparatus such as a roller to a predetermined temperature, thereby eliminating the overheating of the fluid and the heating element. It is in the point to cancel.

The present invention relates to a hollow cylindrical conductive tube in which a plurality of through-holes extending in the same direction as the axial direction are formed in a wall thickness, and a coil wound around the outer periphery of an iron core disposed inside the hollow of the tube The cylinder is heated by an AC voltage applied to the coil, and the fluid flowing through the through hole is heated by the heat generated from the cylinder.

  In the present invention, since the entire hollow cylindrical conductive cylinder in which a plurality of through holes extending in the same direction as the axial direction is formed in the wall thickness is heated by induction or direct energization, the fluid flowing through the through holes The heat transfer area with the conductive cylinder serving as the heating element can be increased, the heating efficiency of the fluid is increased, and local heating of the fluid and abnormal heating of the heating element can be avoided. That is, the heating temperature of the heating element can be set below the heat resistance temperature of the fluid.

Forming multiple through-holes for fluid flow for the purpose of increasing the fluid heating efficiency to heat the heat treatment device such as rollers to a predetermined temperature by flowing the fluid through the inside, and eliminating overheating of the fluid and heating element This was realized by making the cylinder a heating element.

  FIG. 1 is a cross-sectional view showing a configuration of a fluid heating apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view of a heating element shown in FIG. 1 and 2, 11 is a heating element, 12 is a coil, and 13 is an iron core. The heating element 11 has a thick hollow cylinder made of a conductive metal, and a coil 12 wound around an iron core 13 is inserted into the hollow. By applying an AC voltage to the coil 12, a cylindrical shape is formed. A current flows through the heating element 11, and heat is generated by the current.

  In the thick part of the cylindrical heating element 11, there are a plurality of longitudinally extending through holes 11a through which the fluid to be heated flows, and a plurality of longitudinal directions through which the cooling fluid flows as shown in FIG. The extending through holes 11b are alternately formed, and the heated fluid is heated by the heat generated by the cylindrical heating element 11 while passing through the through holes 11a. The through-hole 11b is for allowing a cooling fluid such as water to flow when the temperature of the fluid to be heated is lowered.

  Further, a plurality of sealed chambers 11c extending in the longitudinal direction are formed in the wall thickness of the cylindrical heating element 11, and a gas-liquid two-phase heat medium is sealed in the sealed chamber 11c. ing. By enclosing the gas-liquid two-phase heat medium in the sealed chamber 11c, the entire cylindrical heating element 11 becomes uniform by the latent heat transfer of the gas-liquid two-phase heat medium, and the average temperature of the cylindrical heating element 11 is increased. Can be set high, and can be used at high temperatures and heated with high efficiency.

  For example, if the heat resistant limit temperature of the fluid is 290 ° C., the temperature of the inlet fluid into which the fluid flows is 180 ° C., and the temperature of the outlet fluid is 220 ° C., there is no sealed chamber 11c and the gas-liquid two-phase heat medium When there is no latent heat transfer, the temperature near the inlet of the cylindrical heating element 11 is 250 degrees, the temperature near the outlet is 290 ° C., and the average temperature is 270 ° C. When there is this latent heat transfer, the temperature near the inlet and the outlet is The average temperature can be increased to 290 ° C., the average temperature can be increased to 290 ° C., and heating can be performed with high efficiency.

  The fluid heating device described above is suitable as a heating device that heats the heat medium made of the fluid of the heat treatment roller device shown in FIG. 3, but the present invention is, for example, a heating plate that flows and heats the heated fluid. It can also be applied as a fluid heating apparatus.

It is sectional drawing which shows the structure of the fluid heating apparatus which concerns on the Example of this invention. It is a perspective view of the heat generating body shown in FIG. It is a block diagram of the conventional heat processing roller apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Cylindrical heating element 11a Through-hole through which the fluid to be heated flows 11b Through-hole through which the fluid for cooling flows 11c The sealed chamber which encloses the gas-liquid two-phase heat medium 12 Coil 13 Iron core

Claims (3)

  A hollow cylindrical conductive tube having a plurality of through holes extending in the same direction as the axial direction in the wall thickness, and a coil wound around the outer periphery of an iron core disposed inside the hollow of the tube The fluid heating apparatus is characterized in that the cylinder is heated by an AC voltage applied to the coil, and the fluid flowing through the through hole is heated by the heating of the cylinder.   2. The fluid according to claim 1, wherein a plurality of sealed chambers extending in the same direction as the axial direction are formed inside the wall of the cylinder, and a gas-liquid two-phase heat medium is sealed in each sealed chamber. Heating device.   The fluid heating device according to claim 1, wherein the heat generation of the cylinder is heat generation by an induced current.

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