JP2006090587A - Superheated steam generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superheated steam generator capable of efficiently heating a fluid flowing in a pipe body. <P>SOLUTION: The superheated steam generator is provided with the conductive pipe body 11 supplied with the fluid from one end; an internal heating element 12 arranged in the pipe body 11; and an induction coil 20 wound around the pipe body 11 to allow an induced current to flow to the pipe body 11 and the internal heating element 12, wherein superheated steam is generated by heating the fluid in the pipe body 11 by the induced current. A peripheral wall of the pipe body is provided with a slit 13 along the axial direction of the pipe body 11, and the slit is blocked with an insulating material 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a superheated steam generator that generates superheated steam by heating a fluid such as steam or water.

  Conventionally, a superheated steam generator that generates superheated steam using induction heating of an induction coil is known (see Patent Document 1).

Such a superheated steam generator includes a boiler that heats water to generate steam, a cylindrical conductive passage through which steam generated by the boiler passes, an induction coil wound around the outer periphery of the conductive passage, and the like It has. Then, a high frequency voltage is applied to the induction coil to cause an induction current to flow through the conductive passage, water vapor passing through the conductive passage is heated by the induction current, and superheated water vapor is generated by this heating.
JP 2004-141474 A

  However, in such a superheated steam generator, an eddy current is generated on the outer peripheral wall of the conductive passage by the induction coil, and the steam in the conductive passage is heated by this eddy current. The current flows in a direction that prevents a change in magnetic flux passing through the conductive path, i.e., the surface of the outer peripheral wall of the conductive path along the circumferential direction. In particular, since a high-frequency voltage is applied to the induction coil, the skin effect of the induced current due to the induction coil becomes significant, and only the outer surface of the conductive path generates heat. For this reason, there existed a problem that the heating efficiency of the electroconductive channel | path which heats water vapor | steam was bad.

  Even when a heating metal is placed in the conductive passage, the eddy current in the outer peripheral wall of the conductive passage cancels out the magnetic flux penetrating the metal, so the eddy current generated in the metal is small, Or hardly flows. For this reason, there existed a problem that heating efficiency was bad like the above.

  The objective of this invention is providing the superheated steam generator which can heat the fluid which flows through a tubular body efficiently.

According to the first aspect of the present invention, there is provided a conductive tube body to which a fluid is supplied from one end, a conductive member disposed in the tube body, and the tube body and the conductive member wound around the tube body. An overheated steam generator for generating superheated steam by heating the fluid in the tube by the induced current,
A slit is provided on the peripheral wall of the tubular body along the axial direction of the tubular body,
The slit is closed with an insulating material.

    The invention of claim 2 is characterized in that the conductive member is a columnar member disposed along the axis of the tube.

  The invention of claim 3 is characterized in that a plurality of the columnar members are provided.

  The invention according to claim 4 is characterized in that the conductive member is a plurality of spheres.

  The invention according to claim 5 is characterized in that the conductive member has a plurality of cylindrical members arranged substantially concentrically, and a slit is provided in each cylindrical member along the axial direction.

  According to the present invention, since the tube body is provided with the slit along the axial direction, it is possible to prevent the generation of eddy current flowing on the outer surface of the tube body, and thereby the conductivity disposed in the tube body. An eddy current can be efficiently generated in the member. For this reason, the fluid which flows through a tubular body can be heated efficiently.

  Embodiments of the superheated steam generator according to the present invention will be described below with reference to the drawings.

[First embodiment]
FIG. 1 shows a superheated steam generator 10 used for, for example, heat disinfection of medical instruments, heat treatment of foods, etc., and drying treatment of wood.

  The superheated steam generator 10 has a metal cylindrical tubular body 11, a metallic internal heating element (conductive member) 12 disposed in the tubular body 11, and an outer periphery of the tubular body 11. It is composed of a rotating induction coil 20 and the like. The internal heating element 12 is formed in a columnar shape and is disposed along the axis of the tube body 11. The internal heating element 12 is supported by a support member (not shown) provided at the bottom of the tube body 11, and this support member does not interfere with the flow of saturated steam, which will be described later.

  A supply means (not shown) for supplying saturated vapor (fluid) into the tube 11 is connected to one end (the lower end in FIG. 1) of the tube 11 and the upper end (in FIG. 1) of the tube 11. A pipe line (not shown) for sending superheated steam discharged from the upper end to a heat treatment unit (not shown) is connected to the pipe.

  The tubular body 11 is formed with a slit 13 having a predetermined width extending in the axial direction from the upper end to the lower portion. The slit 13 is filled with an insulator 14 such as ceramic or quartz glass, and the slit 13 is closed by the insulator 14 so that vapor does not leak from the slit 13.

The induction coil 20 is connected to a high-frequency power supply device (not shown) so that a high-frequency voltage is applied. In addition, the induction coil 20 winds the pipe body 11 through the heat insulating material which is not shown in figure, and the temperature of the induction coil 20 is prevented from rising too much.
[Operation]
Next, operation | movement of the superheated steam generator 10 comprised as mentioned above is demonstrated.

  First, a high frequency voltage is applied to the induction coil 20 by a high frequency power supply device. By applying the high frequency voltage, a high frequency current flows through the induction coil 20. The high frequency current of the induction coil 20 generates alternating magnetic fields H1 and H2 that penetrate the tube 11 and the internal heating element 12.

  Since the tube body 11 is provided with the slit, an eddy current flowing around the outer surface of the tube body 11 is not generated by the alternating magnetic field. By not generating this eddy current, the magnetic flux H2 penetrating the internal heating element 12 is not canceled by the eddy current, and therefore generated around the outer surface of the internal heating element 12 by the magnetic flux H2 penetrating the internal heating element 12. The eddy current S2 is a large current.

  Further, since no eddy current is generated on the outer surface of the tube 11, the energy of the alternating magnetic field is changed from the eddy current S 1 flowing in the thickness direction of the tube 11 by the magnetic flux H 1 penetrating the tube 11 as shown in FIG. The eddy current S2 of the internal heating element 12 is dispersed into two. For this reason, the eddy current S1 also becomes a large current.

  And not only the outer surface of the tube 11 but the inner peripheral surface of the tube 11 can be sufficiently heated by the eddy current S1 flowing in the thickness direction. Further, the outer surface of the internal heating element 12 can be sufficiently heated by the eddy current S2.

By these heating, the saturated steam in the tube body 11 is efficiently heated to become superheated steam and is discharged from the upper end of the tube body 11.
[Second Embodiment]
FIG. 2 shows the superheated steam generator 30 of the second embodiment. In the superheated steam generator 30, a plurality of metal columnar members (internal heating elements) 31 having a small diameter are arranged in the tube body 11 along the axial direction of the tube body 11. The columnar member 31 is supported by, for example, a net-like support member that does not interfere with the flow of saturated steam.

In this second embodiment, an eddy current S3 is generated on the outer peripheral surface of each columnar member 31, and the surface area where the eddy current is generated is increased as compared with the first embodiment to increase the heating efficiency of saturated steam. It is an improvement.
[Third embodiment]
FIG. 3 shows the superheated steam generator 40 of the third embodiment. In the superheated steam generator 40, a plurality of metal spheres 41 having a small diameter are arranged in a tube body 11. The sphere 41 is supported by a net-like support member as in the first embodiment.

In the third embodiment, the surface area where eddy currents are generated is made larger than in the second embodiment, and the heating efficiency of saturated steam is further improved.
[Fourth embodiment]
FIG. 4 shows the superheated steam generator 50 of the fourth embodiment. In the superheated steam generator 50, a plurality of pipes 51 to 55 having different diameters are arranged substantially concentrically in the pipe body 11, and slits 51 </ b> A to 55 </ b> A are formed in the pipes 51 and 55 in the same manner as the pipe body 11. Is. In FIG. 4, only the pipes 51 and 52 are shown.

  Further, a mounting bracket 60 shown in FIG. 5 is attached to the bottom of the tube body 11. The mounting bracket 60 is formed in an elongated shape, and concave portions 61 and 61 for press-fitting into the lower portion of the tube body 11 are formed at both ends thereof. A pair of notches 62 to 66 and 62 to 66 into which the edge portions of the pipes 51 and 52 are press-fitted are formed between the recesses 61 and 61 according to the diameters of the pipes 51 to 55.

  As shown in FIGS. 6 and 7, the mounting bracket 60 is attached to the bottom of the pipe body 11, and the lower edges of the pipes 51 to 55 are formed in the notches 62 to 66 and 62 to 66 of the mounting bracket 60. The pipes 51 to 55 are supported on the mounting bracket 60 by being press-fitted.

  According to the fourth embodiment, since the slits 51A to 55A are formed in the pipes 51 to 55, eddy currents in the thickness direction flow through the pipes 51 to 55, and saturated steam is generated by the pipes 51 to 55. This can improve the heating efficiency of the saturated steam. The pipe 55 may not be provided with the slit 55A.

It is explanatory drawing which showed the structure of the superheated steam generator which concerns on this invention. It is explanatory drawing which showed the structure of the superheated steam generator of 2nd Example. It is explanatory drawing which showed the structure of the superheated steam generator of 3rd Example. It is explanatory drawing which showed the structure of the superheated steam generator of 4th Example. It is the front view which showed the attachment metal fitting of the superheated steam generator of FIG. It is the top view which showed the superheated steam generator shown in FIG. It is the fragmentary sectional view which showed the superheated steam generator shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Superheated steam generator 11 Tubing body 12 Internal heating element 13 Slit 14 Insulation material 20 Induction coil

Claims (5)

A conductive tube to which a fluid is supplied from one end; a conductive member disposed in the tube; an induction coil wound around the tube and causing an induced current to flow through the tube and the conductive member; A superheated steam generator for heating the fluid in the pipe body by induction heating of the pipe body and the conductive member to generate superheated steam,
A slit is provided on the peripheral wall of the tubular body along the axial direction of the tubular body,
An overheated steam generator characterized in that the slit is closed with an insulating material.   2. The superheated steam generator according to claim 1, wherein the conductive member is a columnar member disposed along an axis of a tubular body.   The superheated steam generator according to claim 2, wherein a plurality of the columnar members are provided.   The superheated steam generator according to claim 1, wherein the conductive member is a plurality of spheres.   2. The superheated steam generator according to claim 1, wherein the conductive member has a plurality of cylindrical members arranged substantially concentrically, and a slit is provided in each cylindrical member along the axial direction.

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