TWI669472B - Fluid heating device - Google Patents

Abstract

An object of the present invention is to provide a fluid heating device (100) which does not present a risk of breakage even if the conductor tube (1) is deformed by heating. Specifically, the present invention is provided with an electrical connection member (2) electrically connected between necessary portions of the conductor tube (1) to constitute a short circuit, and can be used as the electrical connection member (2) A member that deforms in accordance with the deformation of the conductor tube (1) with a change in temperature.

Description

Fluid heating device

The present invention relates to a fluid heating device that heats a fluid flowing in a conductor tube by inductively heating or energizing a conductor tube wound in a spiral shape.

Conventionally, in such a fluid heating device, as disclosed in Patent Document 1, there is known a device which utilizes an electrical connecting member extending in the axial direction of a spiral and spirally forms a secondary coil by welding or the like. The plurality of layers of conductor tubes are electrically connected to form a short circuit, thereby reducing reactance and improving heating efficiency.

However, when the spiral conductor tube is subjected to induction heating or electric heating, a current larger than the outer peripheral side flows through the inner peripheral side of the conductor tube having a shorter length and a lower electric resistance value than the outer peripheral side, so that the inner peripheral side becomes Higher temperature than the outer peripheral side. Therefore, the thermal expansion on the inner peripheral side of the conductor tube becomes larger than that on the outer peripheral side, and the mutual arrangement of the tubes in the rewinding direction of the spiral tube changes.

Further, since the outlet side of the fluid is higher in temperature than the inlet side, the winding diameter on the outlet side becomes larger, and the front view shape of the spiral tube is deformed into a trapezoidal shape.

However, if the electrical connecting member is fixed between the necessary portions of the conductor tube as in the prior art, there is a problem that when the conductor tube is to be deformed When a large stress is generated, there is a possibility that fatigue is generated and damage occurs in the conductor tube, the electrical connection member, or the fixed portion of the conductor tube and the electrical connection member.

Prior technical literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2010-71624.

The present invention has been made to solve the above problems, and a main object of the present invention is to provide a fluid heating device in which a necessary portion for electrically connecting a conductor tube is electrically connected using an electrical connecting member When the short-circuit circuit is formed, the reactance is lowered, and the conductor tube is deformed by heating, and the possibility of breakage or the like is also small.

That is, the present invention provides a fluid heating apparatus that heats a fluid flowing in a conductor tube by induction heating or electric heating, which is characterized in that the fluid heating apparatus is characterized in that The fluid heating device includes an electrical connection member electrically connected between necessary portions of the conductor tube to constitute a short circuit, and the electrical connection member is deformable in accordance with deformation of the conductor tube accompanying temperature change.

More specifically, it can be exemplified that the electrical connecting member is mounted on the surface of the conductor tube in the axial direction of the spiral.

Preferably, the cross-sectional area and the number of connections of the electrical connecting member are set based on the current value flowing in the electrical connecting member of each mounting portion. The value of the current flowing in each of the electrical connection members is largely different due to the difference in the magnetic coupling state or impedance of the input side coil. If the cross-sectional area and the number of connections of the connecting member corresponding to the current value are set, excessive heating can be prevented, and excessive cross-sectional area and number of connections can be avoided. the amount.

As a preferred embodiment of the electrical connecting member, a metal mesh may be used to form the electrical connecting member. According to this aspect, since not only the longitudinal direction is easily deformed but also the lateral direction is easily deformed, it is possible to sufficiently cope with the unpredictable deformation of the conductor tube.

As another preferred embodiment of the electrical connecting member, it is exemplified that the electrical connecting member is formed using a metal plate which is subjected to bending processing in the intermediate portion thereof. In this way, the electrical connection member has mobility and can easily ensure a large conductive sectional area.

When the conductor tube heats the fluid to generate superheated steam, the temperature rise increases in the fluid heating device, and the deformation of the conductor tube also increases. Therefore, the effects of the present invention are particularly remarkable.

According to the invention as described above, since the electrical connection member is deformed in accordance with the deformation accompanying the temperature change of the conductor tube, the fixing portion of the conductor tube, the electrical connection member, the conductor tube, and the electrical connection member can be prevented in advance. Accumulated fatigue and damage as a result.

1‧‧‧Conductor tube

2‧‧‧Electrical connection members

21‧‧‧ terminal board

22‧‧‧Metal net

23‧‧‧Metal plates

100‧‧‧ Fluid heating device

A~k‧‧‧Electrical connection member

Fig. 1 is a front view mainly showing a conductor tube of a fluid heating device according to an embodiment of the present invention.

Fig. 2 is a side view mainly showing a conductor tube of the same embodiment as Fig. 1;

Fig. 3 is a front view, a bottom view and a side view showing an electrical connecting member of the same embodiment as Fig. 1;

Figure 4 is a diagram showing the main part of an electrical connecting member according to another embodiment of the present invention. View, bottom view and side view.

Fig. 5 is a view showing an electrical connection member at each mounting portion.

Hereinafter, an embodiment of the fluid heating apparatus 100 of the present invention will be described with reference to the drawings.

The fluid heating device 100 has a primary coil (not shown) wound along a core, and a secondary coil (see FIGS. 1 and 2) composed of a spiral conductor tube 1 in which the conductor tube 1 is The outer circumference or inner circumference or the primary coil is wound along the primary coil, and the fluid flowing through the inside of the conductor tube 1 constituting the secondary coil is heated by induction heat generation of the conductor tube 1. Further, an inlet port is formed at one end portion of the conductor tube 1 constituting the secondary coil, and the inlet port is connected to an external pipe for supplying a fluid to the secondary coil, and a discharge port is formed at the other end portion of the conductor pipe. The outlet is connected to an external pipe for discharging the heated fluid to the outside.

Further, the fluid heating device 100 herein is used as a superheated steam generating device that heats water as a fluid and heats the water by the conductor tube 1 to generate over 100 ° C (200 ° C to 2000 ° C). The superheated vapor, but the heating temperature or the heating object fluid is not limited thereto. For example, the saturated water vapor generated outside may be heated by the conductor tube 1 to generate superheated steam.

Further, in the above-described embodiment, as shown in FIG. 2, an electrical connection member 2 is provided which electrically connects the necessary portions of the conductor tube 1 to constitute a short circuit.

As shown in FIG. 3, the electrical connecting member 2 is made of a metal strip. The pair of connection terminal plates 21 and the metal mesh 22 are electrically and mechanically fixed to the conductor tube 1 by welding or the like, and the metal mesh 22 is mounted on the connection terminal plate 21 between. Further, the pair of connection terminal plates 21 are electrically and mechanically fixed to the outer peripheral side portion of the secondary coil of the conductor tube 1 by welding or the like. Further, the metal mesh 22 expands and contracts in accordance with the expansion or contraction of the distance between the pair of connection terminal plates 21, and is formed in a strip shape which is curved in the middle in the present embodiment, and a plurality of metals are placed between the terminal blocks 21 for connection. Net (three in Figure 3).

Further, the electrical connecting member 2 has a plurality of (here, three or more) mounted on the surface of the conductor tube 1 in a posture in which the extending direction thereof is parallel to the axial direction of the spiral. Further, it is preferable that the plurality of electrical connection members 2 are dispersedly mounted over the entire outer circumference of the secondary coil and spaced apart from each other. In Fig. 2, two or three electrical connection members 2 are linearly mounted in the axial direction of the spiral. Further, the terminal block 21 for connection of each of the electrical connecting members 2 is not attached to an adjacent conductor tube element (a portion of the conductor tube 1 that constitutes a spiral), but is mounted on every other one or more separated conductor tube elements. And connect them to the necessary parts.

As the material of the terminal block 21 for connection and the metal mesh 22, austenitic stainless steel such as SUS304 or SUS316L which is heat-resistant and which is not easily oxidized, and INCONEL-alloy (such as JIS alloy No. NCF601) are used.

Therefore, in the case of the above-described electrical connection member, since the electrical connection member 2 is deformed correspondingly to the deformation of the conductor tube 1 accompanying the temperature change, The conductor tube 1 or the electrical connection member 2 itself or the fixed portion of the conductor tube 1 and the electrical connection member 2 does not generate a large stress, and it is possible to prevent cumulative fatigue and damage as a result.

Further, since the metal mesh 22 which can be easily deformed not only in the longitudinal direction but also in the lateral direction is used as the electrical connecting member 2, it is possible to sufficiently cope with the unpredictable deformation of the conductor tube 1.

Further, in this embodiment, since the heating temperature for generating the superheated steam becomes high, the deformation of the conductor tube 1 also becomes large, so the effect becomes particularly remarkable.

In addition, the invention is not limited to the embodiment.

As shown in FIG. 4, for example, the electrical connection member 2 may be formed using the metal plate 23 which has been bent between the connection terminal plates 21. Further, as the metal plate subjected to the bending process, a metal plate subjected to bending processing or a metal plate subjected to bending processing or the like can be considered. In the case of the above-described metal plate, it is possible to have deformability and to secure a large conductive cross-sectional area. As the material of the metal plate, it is preferred to use the same material as the metal mesh.

Further, it is preferable to set the sectional areas of the respective electrical connection members and the number of their connections based on the current value flowing in the electrical connection members of each mounting portion. Fig. 5 is a view showing an electrical connection member at each mounting portion, and Table 1 shows an example of a current value at the time of application of a rated voltage value of each of the electrical connecting members (a to k) shown in Fig. 5. The current value flowing in each of the electrical connection members differs depending on the magnetic coupling state and the impedance of the input side coil, and the values thereof are largely different as shown in Table 1. If the cross-sectional area and the number of connections of the connecting member corresponding to the current value are set, overheating can be prevented, and excessive cross-sectional area and number of connections can be avoided.

Further, the electrical connection member of the embodiment is mounted in a posture in which the extending direction thereof is parallel to the axial direction of the spiral, that is, in the axial direction of the spiral, but the electrical connecting member can also be mounted in a posture in which the extending direction thereof is offset from the axial direction of the spiral. . For example, the electrical connection member can also be formed in the direction in which it extends and the axial direction of the spiral. The angle is, for example, inclined within a range of ±45 degrees (more preferably within a range of ±10 degrees).

Further, as a heating method of the fluid heating device, in addition to the induction heating method as in the above-described embodiment, an energization heating method may be employed in which Joule heating is generated by directly flowing a current through a conductor tube wound in a spiral shape. .

The present invention is not limited to the embodiments described above, and various modifications may be made without departing from the spirit and scope of the invention.

The technical features described in the respective embodiments of the present invention can be combined with each other to form a new technical solution.

Claims (5)

A fluid heating device for heating a fluid flowing through a conductor tube by induction heating or electric heating; the fluid heating device is provided with an electrical connection member, and the electrical connection member is electrically Connecting a necessary portion of the conductor tube to form a short circuit, the electrical connection member being deformable corresponding to a deformation of the conductor tube accompanying a temperature change; based on a current value flowing in the electrical connection member at each mounting portion, The cross-sectional area and the number of connections of the electrical connecting member are set. The fluid heating device of claim 1, wherein the electrical connection member is mounted on the conductor tube in a spiral axial direction. The fluid heating device of claim 1, wherein the electrical connection member is formed using a metal mesh. The fluid heating device according to claim 1, wherein the electrical connection member is formed using a metal plate, and a bending process is performed in an intermediate portion of the metal plate. The fluid heating device of claim 1, wherein the conductor tube heats the fluid to generate superheated vapor.