JP2009014230A - Fluid heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that there are limits to improvement of heating efficiency, and strength is degraded at high temperatures in a conventional fluid heater. <P>SOLUTION: This fluid heating device is composed of a cylindrical pipe having a fluid inflow port at its one end and a fluid outflow port at the other end, honeycomb structures of both end openings disposed in a state of axially extending in the cylindrical pipe, and sheath heaters disposed in the honeycomb structures in a state of axially extending, and the honeycomb structures are composed of a plurality of cells kept into contact with each other at outer peripheral faces. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fluid heating apparatus, and more particularly to a fluid heating apparatus having a honeycomb structure and a sheath heater.

Patent Document 1 discloses a fluid heater in which a cylindrical heater element is arranged in a conduit for flowing a fluid to be heated, and the outer periphery of the cylindrical heater element is covered with a wave heat exchanger having a high thermal conductivity. Has been.
JP2003-148806

  However, the above conventional fluid heater has a limitation in improving the heating efficiency and has a drawback that the strength is lowered at a high temperature.

  The present invention eliminates the above-mentioned drawbacks.

  A fluid heating apparatus according to the present invention includes a cylindrical pipe having a fluid inlet at one end and a fluid outlet at the other end, and a honeycomb structure having both ends opened in the cylindrical pipe so as to extend in the axial direction. And a sheath heater arranged so as to extend in the axial direction in the honeycomb structure, and the honeycomb structure is composed of a plurality of cells whose outer peripheral surfaces are in contact with each other.

  The sheath heater is composed of a plurality of aggregates whose outer peripheral surfaces are in contact with each other.

  In addition, a plurality of the sheath heaters are inserted into the plurality of cells constituting the honeycomb structure.

  The outer peripheral surface of the cell forming the honeycomb structure is a corrugated surface.

  According to the fluid heating apparatus of the present invention, the honeycomb structure that allows fluid to flow around the outer periphery of the sheath heater is provided in the axial direction, and the contact area between the fluid and the honeycomb structure can be increased, whereby the fluid can be efficiently heated. It becomes like this.

  In addition, since the honeycomb structure is used, the strength of the fluid heating device main body itself can be maintained high even at high temperatures and can be used stably over a long period of time.

  Further, by increasing the number of sheath heaters inserted into the honeycomb structure, the watt density can be increased, and higher heating efficiency and heating temperature can be obtained.

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

  In the present invention, as shown in FIGS. 1 and 2, the above metal cylinder having a metal pipe 3 having a fluid inlet 1 at one end and a fluid outlet 2 at the other end, and a heating element 4 at the center. A sheath heater 5 arranged so as to extend in the axial direction at the center of the tubular pipe 3, and an axial direction in which both ends arranged so as to fill a gap between the outer peripheral surface of the sheath heater 5 and the inner peripheral surface of the metal tubular pipe 3 are opened. A fluid heating device is constituted by the honeycomb structure 6 extending in the direction.

  The honeycomb structure 6 is formed by a number of cells 7 having a hexagonal cross section in which the outer peripheral surfaces are in contact with each other. In addition, it is preferable that the outer peripheral surface of the cell 7 in contact with each other, the inner peripheral surface of the metal cylindrical pipe 3 and the outer peripheral surface of the sheath heater 5 are joined to each other by brazing or the like.

  The outer shape of the sheath heater 5 may be a polygonal shape, for example, a hexagonal cross section so as to increase the contact area with the cell 7.

  Further, if the outer diameter of the cells 7 forming the honeycomb structure 6 is reduced so that a larger number of cells 7 can be disposed between the metal cylindrical pipe 3 and the sheath heater 5, the heating efficiency can be improved. become.

  If a plurality of the fluid heating devices are connected in series in the axial direction, the temperature of the fluid passing therethrough can be further increased.

  In another embodiment of the present invention, a plurality of sheath heaters 5 may be used, and these may be concentrated at the center of the metal cylindrical pipe 3 as shown in FIG. 3, and the cell 7 as shown in FIG. In this way, the watt density can be increased and the temperature of the fluid can be increased in a short time.

  FIG. 5 shows still another embodiment of the present invention in which the outer peripheral surface of each of the cells 7 forming the honeycomb structure 6 is not a flat surface but a corrugated surface. The fluid can be heated to a predetermined temperature.

  The cross-sectional shape of the cells 7 constituting the honeycomb structure 6 is not limited to a hexagon, but may be an OX type, a flex type, a biset type, a feather type, or the like as shown in FIGS.

  As described above, in the fluid heating apparatus of the present invention, the honeycomb structure 6 that flows the fluid to the outer periphery of the sheath heater 5 is provided in the axial direction so that the contact area between the fluid and the honeycomb structure 6 is increased. The fluid flowing in the structure 6 can be efficiently heated. Moreover, heat dissipation and heat conduction can be improved by reducing the diameter of the cells 7 forming the honeycomb structure 6 and increasing the number thereof, or by making the outer peripheral surface a corrugated surface, thereby improving the heating efficiency.

  Further, since the honeycomb structure 6 is used, the strength of the fluid heating device main body itself can be maintained high even at high temperatures, and can be used stably over a long period of time.

  Further, by increasing the number of sheath heaters 5 inserted into the honeycomb structure 6, the watt density can be increased, and further heating efficiency and heating temperature can be obtained. Moreover, fluid temperature can be made higher by connecting a fluid heating apparatus in series.

  In addition, the sheath heater 5 has a polygonal shape, the contact area with the cells 7 forming the honeycomb structure 6 is increased, and both are joined by brazing or the like. It can be a heating device.

It is a vertical front view of the fluid heating apparatus of the present invention. It is the sectional view on the AA line of FIG. It is a vertical side view of the other Example of the fluid heating apparatus of this invention. It is a vertical side view of the further another Example of the fluid heating apparatus of this invention. It is a vertical side view of the further another Example of the fluid heating apparatus of this invention. It is explanatory drawing which shows a deformation | transformation of a honeycomb structure. It is explanatory drawing which shows a deformation | transformation of a honeycomb structure. It is explanatory drawing which shows a deformation | transformation of a honeycomb structure. It is explanatory drawing which shows a deformation | transformation of a honeycomb structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid inlet 2 Fluid outlet 3 Metal cylindrical pipe 4 Heat generating body 5 Sheath heater 6 Honeycomb structure 7 Cell

Claims (4)

  A cylindrical pipe having a fluid inlet at one end and a fluid outlet at the other end, a honeycomb structure having openings at both ends disposed so as to extend in the axial direction in the cylindrical pipe, and a shaft in the honeycomb structure A fluid heating apparatus comprising: a sheath heater arranged so as to extend in a direction, wherein the honeycomb structure comprises a plurality of cells whose outer peripheral surfaces are in contact with each other.   2. The fluid heating apparatus according to claim 1, wherein the sheath heater comprises a plurality of aggregates whose outer peripheral surfaces are brought into contact with each other.   The fluid heating apparatus according to claim 1, wherein a plurality of the sheath heaters are inserted into a plurality of the cells constituting the honeycomb structure.   4. The fluid heating apparatus according to claim 1, wherein the outer peripheral surface of the cell forming the honeycomb structure is a corrugated surface.

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