JPH09196470A - Fluid heating type heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heat transmission by forming a heater, of a fluid pipe in which a fluid to be heated is made to flow, a heater being arranged in the fluid pipe, and a spiral fluid rectifying plate which extends in the axial direction. SOLUTION: An internal pipe 7 of a smaller diameter is concentrically arranged in a fluid pipe 1, and on the outer periphery of the internal pipe 7, a fluid rectifying plate 8 which spirally surrounds the internal pipe 7 and comes into contact with the inner peripheral surface of the fluid pipe 1, is attached. Heaters 2 which go through the fluid rectifying plate 8, and extend in the axial direction, are arranged so as to be apart from each other in the circumferential direction. A fluid 3 to be heated which flows from an fluid inlet 5 to a fluid outlet 6, becomes a rectified stream along the fluid rectifying plate 8, and the stream of the fluid becomes uniform, and the heating efficiency is improved. By this fluid heating type heater, a fluid heating of a favorable efficiency can be realized, and also, there is a big merit such as extending the life of the heater.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fluid heater,
In particular, it relates to a fluid heater adapted to heat a fluid through a spiral passage.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional fluid heater.
Reference numeral 1 is a fluid pipe, 2 is an electric heater provided in the fluid pipe 1, 3 is a fluid to be heated such as air or gas flowing in the fluid pipe 1, and 4 is axially separated from each other in the fluid pipe 1. Baffles 5 alternately extending from the inner wall surface of the fluid pipe 1 toward the center thereof, 5 is a fluid inlet, and 6 is a fluid outlet.

In such a conventional fluid heater, the fluid 3 to be heated is heated by the heater 2 from the fluid inlet 5 toward the fluid outlet 6 while the baffle plate 4 acts as shown by the curve in FIG. It will flow in 1 in a sine curve shape with the tip of the baffle plate 4 as the apex,
As a result, the heated fluid 3 is effectively heated by the heater 2.

[0004]

However, such a conventional fluid heating heater has a drawback that turbulent flow occurs near the base of the baffle plate 4 and heat transfer to the heated fluid 3 is deteriorated. It was Further, the heater is liable to be partially overheated and the heater may be burnt out, so that the heater cannot be used in the vicinity of the limit temperature.

The present invention has been made to eliminate such disadvantages.

[0006]

A fluid heating heater according to the present invention comprises a fluid pipe through which a fluid to be heated flows, a heater disposed in the fluid pipe, and a spiral fluid straightening plate extending in the axial direction.

In the fluid heater of the present invention, a porous plate is arranged at the fluid outlet of the fluid pipe so as to close the fluid outlet.

In the fluid heating heater of the present invention, the heater is an axially extending heater, and has a large watt density at the fluid inlet and a small watt density at the fluid outlet.

In the fluid heating heater of the present invention, the heater is a heater extending in the axial direction. The fluid inlet has a large watt density, the fluid outlet has a small watt density, and the intermediate position has a medium watt density.

[0010]

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

In the first embodiment of the present invention, as shown in FIG. 1, for example, an inner pipe 7 having a small diameter is concentrically arranged in a fluid pipe 1 having an inner diameter of 100 mm, and the inner pipe 7 is provided on the outer periphery thereof. A fluid straightening plate 8 is attached in contact with the inner peripheral surface of the fluid pipe 1 which surrounds the spiral shape, and nine heaters 2 penetrating through the fluid straightening plate 8 and extending in the axial direction are arranged in a circumferentially spaced manner from each other. To do.

Since the first embodiment of the present invention has the above-mentioned structure, the heated fluid 3 flowing from the fluid inlet 5 toward the fluid outlet 6 is rectified along the fluid rectifying plate 8 and the flow of the fluid. Becomes uniform and the heating efficiency is improved.

In the second embodiment of the present invention, as shown in FIG. 2, a plurality of holes 9 are further formed in the fluid outlet 6 of the fluid pipe 1.
The perforated plate 10 having the holes is arranged, and the number and size of the holes of the perforated plate 10 are adjusted so that the temperature of the fluid to be heated 3 is the fluid outlet 6
In order to achieve the set temperature evenly.

Since the second embodiment of the present invention is constructed as described above, the heated fluid 3 at the fluid outlet 6 can be set to a uniform set temperature.

In the third embodiment of the present invention, the heater 2 has a large watt density at the fluid inlet 5 portion, for example, 15 W / cm ² , and a small watt density at the fluid outlet 6 portion.
For example, it is set to 7 W / cm ² , and the intermediate portion has a medium watt density, for example, 10 W / cm ² .

According to the third embodiment of the present invention, the fluid 3 to be heated at the fluid inlet 5 of, for example, 20.degree.
The temperature is gradually increased according to the following flow, and even if the wattage of the heater 2 is small at the fluid outlet 6, the temperature is high, for example, 800 ° C., but the heater 2 does not overheat.

On the other hand, when a heater having a constant wattage in the axial direction is used, the heater is overheated at the fluid outlet.

[0018]

As described above, according to the fluid heating heater of the present invention, not only can efficient fluid heating be realized, but the life of the heater can be extended, which is a great advantage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluid heater of the present invention.

FIG. 2 is a sectional view showing another embodiment of the fluid heater of the present invention.

FIG. 3 is a cross-sectional view of a conventional fluid heater.

[Explanation of symbols]

 1 Fluid Pipe 2 Heater 3 Heated Fluid 4 Baffle Plate 5 Fluid Inlet 6 Fluid Outlet 7 Inner Tube 8 Fluid Rectifier 9 Hole 10 Perforated Plate

Claims (4)

[Claims] 1. A fluid heating heater comprising: a fluid pipe for flowing a fluid to be heated; a heater disposed in the fluid pipe; and a spiral fluid straightening plate extending in the axial direction. 2. The fluid heater according to claim 1, wherein a perforated plate is arranged at the fluid outlet of the fluid pipe so as to close the fluid outlet. 3. The fluid heating heater according to claim 1, wherein the heater is a heater extending in the axial direction, and has a large watt density at the fluid inlet and a small watt density at the fluid outlet. 4. The heater according to claim 1, wherein the heater is an axially extending heater and has a large watt density at a fluid inlet, a small watt density at a fluid outlet, and a medium watt density at an intermediate position. Fluid heating heater.