JPS58115298A - Heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the weight of the heat exchanger such as an instantaneous hot- water heater or the like and improve the corrosion-resistant property as well as the heat exchanging efficiency thereof by a constitution wherein iron composite tubes, having corrosion-resistant metal layers at the inner surfaces thereof, are arranged in parallel and are wound into a spiral-shape through a column-shaped body or the like and subsequently, they are arranged in longitudinal arrangement and are wound into the spiral shape. CONSTITUTION:Water W is supplied from a water supplying part 4 to a water discharging part 11 through the longitudinally arranged spiral composite tubes 2 and the parallel row spiral composite tubes 2, then, a burner is ignited. Combustion gas passes through a space enclosed by the longitudinal row composite tubes 2 at first, subsequently, ascends through a spiral space formed by the parallel row composite tubes 2 and heats the water in the composite tubes 2. According to this constitution, the combustion gas contacts with two spiral tubes of longitudinal and parallel arrangements, therefore, a contacting area is increased and the heat exchanging efficiency may be improved. On the other hand, the inner surface of the composite tube 2 is lined with the corrosion-resistant metal or alloy, therefore, the corrosion-resistant property thereof may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger, and more particularly to a heat exchanger that is lightweight, has excellent corrosion resistance, and has good heat exchange efficiency.

Generally speaking, heat exchangers used for instant water heating, for example, are made of copper or copper alloys, and copper or copper alloys have good conductivity when aged, so heat exchange efficiency is low. is good, but it can be heavy,
Furthermore, since the combustion of city gas or propane gas may cause corrosion, the wall thickness must be increased, resulting in a heavier weight. For example, as shown in FIG. 6, when combustion gas flows in the direction of the arrow inside the box wall 20 and exchanges heat with the tube 21, the above-mentioned situation occurs.

Compared to heat exchangers made of copper or copper alloys that have been conventionally used for instant water heating, the present invention is relatively lighter, has a better heat exchange rate, and has better corrosion resistance t/jE. This provides an excellent heat exchanger.

The heat exchanger according to the present invention is characterized by a support in which a plurality of composite tubes arranged in parallel, each of which has a corrosion-resistant metal or corrosion-resistant alloy on the inside and an iron-based material on the outside, are attached to a columnar body or an outer shell. After winding the composite tubes in a spiral shape through the tubes, the plurality of composite tubes are arranged vertically and wound in a spiral shape.

The heat exchanger according to the present invention will be explained in detail below.

In the heat exchanger according to the present invention, columns, supports, spiral composite tubes, etc. ) Explain the materials.

First, the columnar body may be a cylindrical body, a prismatic body, etc. with both ends closed, or a cylinder, a prismatic body, etc., and a hole may be provided in the center for passing the exhaust gas. This material may be any heat-resistant and corrosion-resistant material. For example, Fe-based materials are preferred, and pure iron, iron alloys, stainless steel, corrosion-resistant metal 9 alloys, copper, copper alloys, and aluminum and aluminum alloys are used. However, it is convenient to make the columnar body hollow inside and closed at both ends, such as a cylindrical body or a rectangular cylinder, as this will lighten the heat exchanger and save material. be.

Next, the support may be rod-shaped or U-shaped (i.e., it should be attached to either a columnar body or an outer shell to support the tube, and should have enough strength to withstand the weight of the tube, The number of columns may be sufficient, and the material used may be the same as that of the columnar bodies.

The inside of the composite pipe is made of a corrosion-resistant metal or alloy, such as Ti, Zr, Ta, Nb, V, Mo.
Ya Ti.

An alloy of Zr, Ta, Nb, V, and Mo is used, and the outside is a ferrous material, such as pure iron, carbon steel, iron alloy, stainless steel, etc., and the inside material and The materials used on the outside are appropriately combined to form a composite pipe.

Therefore, in the heat exchanger according to the present invention, the shape of the composite tubes is such that the composite tubes are first arranged in parallel in close contact with each other, wound spirally around a columnar body, and supported at multiple locations by supports. Then, this spiral [the more number of windings is better, but it can be selected appropriately from the heat exchange rate, material strength, etc. After turning to form a parallel spiral composite pipe, a plurality of composite pipes are arranged vertically and wound in a spiral to form a tandem spiral composite pipe.The higher the number of windings, the better. It is best to select an appropriate material based on the strength of the material, etc. Also, the outer shell should be made of the same heat-resistant and corrosion-resistant material as the columnar body;

Next, the heat exchanger according to the present invention will be specifically explained using an example shown in the drawings.

FIG. 1 181 is a side view of the heat exchanger according to the present invention, FIG. 1 1b+ is a cross-sectional view of the composite pipe, FIG.
FIG. 3 is a partially cutaway side view showing an example in which the heat exchanger according to the present invention is applied to a water heater; FIG. FIG. 5 shows another example, and FIG. 6 is a perspective view of a conventional heat exchanger.

In FIG. 1, 181 lb+, in FIG. 2, the support 3 is attached to the columnar body 1 at multiple locations (5 locations in FIG. 1) in a U-shaped Vc, for example, by welding, and the Parallel spiral composite pipes 2, 2.2 (Three composite pipes are shown in FIG. 1, but fallen trees may be used as long as there are two or more) are clamped. Although the supports 6 and 3 are U-shaped in FIG. 1, they may be supported on a single support 6, or
In FIG. 1, the support 3 is attached to the columnar body 1, but
This support 3 may be attached to the outer shell 5vc (see FIG. 5). Further, the parallel spiral tubes 2, 2.2 are formed in close contact with each other to prevent fluid, for example, combustion gas from leaking from the gaps between the tubes, the gaps between the tubes and the columnar body, or the outer shell, and It is necessary to provide a width that is just enough to fit within the space between the columnar body 1 and the outer shell 5 (FIG. 6). As will be described later, this is to cause a high temperature fluid, for example, combustion gas, to flow in a spiral pattern and to make sufficient contact with the parallel spiral composite pipes 2, 2.2. Spiral composite tube 2
, 2.2 are wound an appropriate number of times to form a parallel spiral composite tube, and then the composite tubes 2, 2.2 are arranged vertically and then spirally wound to form a tandem spiral composite tube 2, 2. .2, and this tandem spiral composite pipe 2, 2, 2 vc
The heat exchange efficiency is further improved by the two spiral composite tubes 2, 22 arranged in parallel and in tandem.

Further, as shown in FIG. 1, the composite pipe is made of a ferrous material B on the outside and a corrosion-resistant metal or a corrosion-resistant alloy on the inside.

FIG. 6 shows an example of an instantaneous water heater incorporating the heat exchanger of FIG. Parallel helical composite tubes 2, 2.2 and tandem helical composite tubes 2 supported by
, 2.2 is placed. In this case, the parallel helical composite tubes 2.2.2 are closely connected and
No fluid passes between the columnar body 1 and the outer shell 5, and the fluid flows in a VC spiral as shown by the arrow, and then flows further down the parallel spiral composite tubes 2, 2.2. A composite tube 2, 2.2 in the form of a tandem thread 1, which is closely attached to the side, rests on the lower mounting part 12 of the outer shell 5 and is placed in the vicinity of a heat source, for example a gas burner 8 (
Thus, the parallel spiral composite tube 2,
The 2°20 portion is supported by the support member 3Vc, and the vertical spiral composite tube 2.2.2 portion is supported by the mounting portion 12VC.

The bottom plate 7vc is provided with a plurality of gas burners 8 and is supplied with gas G, and an air passage is formed by the outer shell 5 and the wall 6 to send air from the inlet 9 to the gas burners 8 in the direction of the arrow. 5[t, may be. This facilitates combustion of the gas as heated air is passed through.

In addition, in order to send a liquid such as water to the tandem spiral composite pipes 2, 2.2, the one shown in Fig. 4 can also be used for water supply and drainage, but the water W is sent from the pipe PK. The water supply section 4Vc enters, and from here, the vertical spiral composite pipes 2, 2.
2 K and then parallel spiral composite tube 2, 2.2 K
The heated water is sent through parallel spiral composite pipes 2,
The heat exchanger according to the present invention having such a configuration is used. In an instantaneous water heater, when water W is first supplied to the water supply section 4 and flows through the tandem spiral composite pipes and the parallel spiral composite pipes 2, 2.2 and reaches the drain section 11,
When the gas burner 8 is ignited by the gas G, this combustion gas first flows through the vertical spiral composite tubes 2, 2, 2 as shown by the arrow.
From the v-enclosed part, further parallel spiral composite pipe 2,
2,2 VC, the high temperature combustion gas exchanges heat with the water flowing in the vertical and parallel spiral composite pipes 2,2. IN
The discharged water H has a temperature of about 80° to 90°C and is drained for use, while the combustion gas has a low temperature of about 50°C and is discharged into the chimney 10. In this way, since the contact area between the high temperature combustion gas and the two vertical and parallel spiral composite tubes is extremely large, the heat exchange rate between the combustion gas and the water flowing inside the spiral tubes is low. Therefore, the water temperature that is heated and drained is high, and the exhaust combustion gas is also extremely low temperature. It is also possible to use other corrosive liquids.

FIG. 5 shows another example of a water boiler to which the heat exchanger according to the present invention is applied, and the wall 6 in FIG. 3 is omitted, but the embodiment is exactly the same as the explanation in FIG. 6. It is.

Although the case where the columnar body 1 is placed on the bottom plate 7 in FIGS. 1, 6, and 5 has been described, for example, if the outer shell 5
The columnar body 1 is suspended by V'c heat-resistant touch-resistant net, etc., and the columnar body 1 is
The length of the composite pipe can be reduced to about half, since the contact area with the base pipe is extremely large, the heat exchange efficiency is also excellent, and the fuel can be used effectively, and the inside of the composite pipe is made of corrosion-resistant material. , which has the excellent effect of allowing the use of corrosive liquids other than water.

[Brief explanation of drawings]

Fig. 1 al is a schematic side view showing an example of the heat exchanger according to the present invention, Fig. 1 fbl is a sectional view of a composite pipe, Fig. 2 is a view taken along the line A-A in Fig. Fig. 3 is a partially cutaway schematic side view of an instantaneous water heater to which the heat exchanger according to the present invention is applied, Fig. 4 is a sectional view of the water supply section (drainage section), and Fig. 5 is a partially cutaway diagram showing another example. The schematic diagram, FIG. 6, is a perspective view of a conventional heat exchanger. 1 - columnar body, 2 - parallel and tandem spiral composite tube. 6 - Support, 4 - Water supply part, 5 - Outer shell, 6 - Wall, 7 - Bottom plate, 8 - Burner, 9 - Inlet, 10 - Smoke barrel, 11 - Drainage part, 12 - Mounting part, '"-3 Figure IO')-・Me
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Claims (1)

[Claims] A plurality of composite tubes arranged in parallel, each made of a corrosion-resistant metal or corrosion-resistant alloy on the inside and a ferrous material on the outside, are spirally wound through a support attached to a columnar body or outer shell. A heat exchanger characterized in that a plurality of the above-mentioned composite tubes are arranged vertically and wound in a spiral shape,