JPS58115299A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent corrosion caused by combustion gas by a method wherein the heat exchanger for tap-controlled hot-water feeder is constituted by combining the parallel row spiral winding and the longitudinal row spiral winding of composite tubes having corrosion-resistant inner surfaces while the composite tubes, the supporting pillar, supporting bodies and the outer shell thereof are coated by aluminum. CONSTITUTION:Water W, supplied from a water supplying part 4, is sent to a water discharging part 11 through the longitudinal row spiral composite tubes 2 and the parallel row spiral composite tubes 2. In the mean time, the combustion gas of a burner 8 is passed through a space enclosed by the longitudinal row spiral composite tubes 2,then, ascends through a spiral space formed by the parallel row spiral composite tubes 2 and heats the water in the tubes 2. In this case, the composite tubes 2, the supporting pillar 1, the supporting bodies 3 and the outer shell 5 are coated by aluminum or an alluminum alloy 12, therefore, the corrosion thereof may be prevented even if any kind of fuel is used. On the other hand, the heat transmitting area of the heater is increased, the heat exchanging efficiency may be improved and the corrosion-resistant property of the inner surface of the tube may also 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.

General f1 For example, heat exchangers used in VC, such as instantaneous water heaters, are made of copper or copper alloys, and copper or copper alloys have good heat conductivity, so the heat exchange rate is low. Good, but it can be heavy,
In addition, there was a problem that the walls had to be made thicker because the combustion of city gas or propane gas could cause corrosion, making the electric switches heavier. Heat exchangers that use exhaust gas from boilers that burn oil, crude oil, etc. in order to use large amounts of steam at JVC also suffer from corrosion due to the effects of sulfur in the combustion gases such as oil and crude oil. It had to be replaced frequently.

For example, in the heat exchanger made of copper or copper alloy VC shown in FIG.
While the high-temperature combustion gas passes through, it exchanges heat with the water in the tube 21, but as described above, the box-shaped body 20
There are various steps that make the material thicker, which increases the weight, and furthermore, the heat exchange efficiency is not good at all.

The present invention was developed in view of the current state of the heat exchanger described above, and is extremely corrosion resistant to the combustion gases such as city gas, propane gas, Ishiike crude oil, and heavy oil. Furthermore, the heat exchanger according to the present invention provides a heat exchanger with outstanding heat exchange efficiency.The heat exchanger according to the present invention is characterized by having a plurality of inner surfaces arranged in parallel made of corrosion-resistant metal or corrosion-resistant upper alloy on the outside. A composite pipe made of an iron-based material is spirally turned yt-q through a support attached to a columnar body or an outer shell, and then the plurality of composite pipes are arranged in a 4i1K pattern and wound in a spiral shape, and , the columnar body of this assembly, the tube,
The heat exchanger according to the present invention, in which the support and the outer shell are coated with aluminum or aluminum alloy, will be explained in detail below.

In the heat exchanger according to the present invention, materials for the columnar bodies, supports, spiral and composite tubes, etc. will be explained.

First, the columnar body may be a cylindrical body with both ends closed, a prismatic body, etc., 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 a heat-resistant, corrosion-resistant material (for example, Fe-based materials are preferred; pure iron, iron alloys, non-rusting steel, corrosion-resistant, raw metal, and alloys;
+, Copper alloy Also, aluminum and aluminum alloy can be used.

Therefore, the columnar body is hollow inside and both ends θJ vi +; t
It is advantageous to use an i-circular body, a rectangular cylinder, etc., since this makes the heat exchanger lighter and also saves material.

Next, the support may be rod-shaped or rod-shaped, and is attached to either a columnar body or an outer shell to support the U. The number of attachments may be limited, and the material used may be the same as that for the columnar body.

The inside of the composite pipe is resistant to Ii! II metals or alloys, such as Ti, Zr, Ta, Nb, V, M
o'pTi, zr.

An alloy of Ta, Nb, V, Mo is used, and the outside is a ferrous material - for example, pure iron, carbon steel, iron alloy, stainless steel, etc. can be used, and these inner and outer materials are They are combined as appropriate to form a composite pipe.

Therefore, in the heat exchanger according to the present invention, the shape of the composite tubes is such that first, the composite tubes are arranged in parallel in close contact with each other, and are spirally wound around a columnar body, and are supported at multiple locations by supports. The higher the number of spirals, the better, but it can be selected appropriately based on the heat exchange rate, material strength, etc.
Furthermore, the plurality of composite tubes arranged in parallel are wound spirally to form a parallel spiral composite tube, and then the plurality of composite tubes are arranged vertically and wound spirally to form a tandem spiral composite tube. , The higher the number of windings, the better, but the heat exchange rate,
Depending on the strength of the material, etc. (select (7) is best; also, the outer shell should be made of heat-resistant and corrosion-resistant material like the columnar body).
The reason why aluminum or aluminum alloy is used for the coating is that it has good thermal conductivity, is resistant to corrosion, and is preferably made of the same material as the columnar body.
This is due to the fact that the interstitial bodies and columnar bodies of the composite pipe 1 can be firmly brought into close contact with each other. It should be noted that if the aluminum alloy contains about 5 or less iron, the corrosion resistance will be further improved.

The process of melting aluminum or aluminum alloy is to melt the aluminum or aluminum alloy (with a trowel, or through supports such as composite tubes arranged in parallel in the molten aluminum or aluminum alloy). The plurality of composite tubes are arranged vertically and wound in a spiral shape (1), and the columnar body provided with the structure is immersed (i'
* After that, the heat exchanger can be removed and dried.

In addition to this method, the columns, supports, parallel and tandem spiral composite tubes are coated with aluminum or aluminum alloy separately as described in 1 above, and then the parallel and tandem spiral composite tubes are coated with the parallel and tandem spiral composite tubes through the supports. After that, it is installed in a columnar body and then heated in a heating furnace to form a composite pipe.

The support and the columnar bodies are densely packed to form a heat exchanger. The inside of the outer shell is also coated in the same manner as described above.Next, the heat exchanger according to the present invention will be explained in detail with reference to an example shown in the drawings. A side view of the exchanger, FIG. 1 1al is a cross-sectional view of the composite pipe, FIGS. Fig. 4 is a schematic cross-sectional view of the water supply and drainage parts of spiral composite pipes arranged in parallel and in tandem, Fig. 5 shows another example, and Fig. 6 shows a conventional heat pump. It is a perspective view of an exchanger.

In FIG. 1 (al + hl, FIG. 2, in FIG. 2, supports 6 are attached at multiple locations (5 locations in FIG. 1) in a K-shape on the columnar body 1 by, for example, soldering, and the supports 6, 3 Sandwich the parallel spiral composite tubes 2, 2.2 (6 tubes in Figure 1, but any number of tubes as long as there are two or more) between them. Although it is U-shaped in FIG. 1, it may be supported on a single support 6, or the first
In the figure, the support body 6 is attached to the columnar body 1, but this support body 6 may be attached to the outer shell 5 (see FIG. 5).
, and a coating 12 of aluminum or aluminum alloy
is the provision.

In addition, the parallel spiral composite 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 composite tubes or the gaps between the composite tubes, the columnar body, and the outer shell. In addition, there are two holes provided so as to have a width that is just the width of the space between the columnar body 1 and the outer shell 5 (FIG. 6). This is to ensure that the hot fluid, for example combustion gas, flows in a helical manner and makes sufficient contact with the helical tube 2.2.2.

Furthermore, σ] spiral composite pipes 2 arranged in parallel,
2. Wrap 2 appropriately and slowly to make parallel IW spiral composite pipes 2, 2.
．． 2, then connect the plurality of composite pipes 2, 2.2 vertically to vc
The tandem spiral composite tube 2゜2.2 is made by arranging them side by side, and the +t is spirally wound to form a tandem spiral composite tube 2゜2.2. The heat exchange efficiency is further improved by the two parallel and tandem spiral composite tubes 2, 2, 2 VC.

FIG. 6 shows an example of an instantaneous water heater incorporating the heat exchanger of FIG.
Parallel helical composite IJ 2,2.2 and mounting part 13 supported by supports 6°3 on bottom plate 7 mounted on the bottom of
A columnar body 1 is placed on the columnar body 1, which is provided with a parallel spiral and a mesh back 2°2.2.In this case, the parallel spiral ventral tubes 2, 2.2 are in close contact. , and the Me body does not pass between the columnar body 1 and the outer shell 5, and the fluid flows in a spiral shape as shown by the arrow (after forming A, further, this parallel spiral composite tube 2, 2. The vertical spiral composite 4Q-2, 2, 2 that is in close contact with the lower side of 2 is attached to the lower part of the outer shell 16.
Place it on top, S:,,! - For example, the gas burner should be close to 80. In this way, g++ of the parallel helical composite tubes 2, 2.2 is connected to the support A, and the tandem helical composite tubes 2, 2. , 2 are supported by the mounting portion 13. And, as mentioned above, aluminum,
There is an aluminum alloy coating 12. [Q] Several gas burners 8 are provided on the bottom plate 7, gas G is supplied, and an air passage is formed by the outer shell 5 and the wall 6, and an inlet 9 is provided.
Air may be sent from the gas burner 81\ as shown by the arrow. This facilitates the combustion of dregs since heated air is sent. Incidentally, as shown in FIGS. 5 and 6, it is preferable that the bottom plate 7 and the mounting portion 13 also be provided with a covering 4712 made of aluminum or an aluminum alloy.

Also, tandem spiral composite tubes 2, 2.2 K liquid, e.g.
To convey water, the one shown in Fig. 4 can be used for the water supply and drainage sections, but water W enters the water supply section 4 from pipe PK, and from here it is first passed through the tandem spiral composite pipe. 2,2.
2, and then to the parallel spiral composite pipes 21:212, and the water heated by heat exchange is supplied from the end of the parallel spiral composite pipes 2, 2.2. 4 (same-Suito 1
1, as it accumulates in ) and is discharged from pipe P.
, Ru.

In the instantaneous water heater using the VC heat exchanger of the present invention having such a configuration, by first supplying water W to the water supply section 4, the tandem spiral composite pipes and the parallel spiral composite pipes are connected. When the gas burner 8 is ignited by the gas G when it flows through @2, 2.2 and reaches the drainage part 11, this combustion gas first flows into the vertical spiral composite pipes 2, 2 as shown by the arrow.
．． From the part surrounded by 2 K, the parallel spiral ventral tubes 2, 2.2. ,2.
The water flowing in 2 and the high-temperature combustion gas exchange heat, and the water flowing in the drainage A1: is discharged from the chimney 10 as a low temperature of about 5[1], and thus the contact with the high-temperature burning gas and the tandem and parallel spiral composite pipes is extremely large. So the combustion gas and tandem.

Parallel Q)
The exhaust combustion gas also has an extremely low temperature. Note that even if the heat exchanger of the present invention is combined with a boiler, the same effect as described above is obtained. Therefore, in the heat exchanger of the present invention, columnar bodies,
Since the vertical and parallel spiral composite pipes, support, and outer shell are coated with aluminum and aluminum alloy, they can be heated not only with city gas and propane gas, but also with oils such as petroleum, crude oil, and heavy oil. In a boiler or a boiler, the sulfur content is contained in the combustion gas, and the combustion gas is a gaseous body at the bottom of the columnar body 1 due to the temperature of the field. A large number of water droplets containing sulfuric acid are attached to the spiral composite tube and the tandem spiral composite tube 2, and the outer shell 5 is also in the same state. However, these water droplets containing sulfuric acid are extremely destructive, but
Since it is coated with aluminum or aluminum alloy, it does not corrode the underlying metal or alloy material and can be used for an extremely long time. This explanation is mainly due to the sulfur content in the combustion gas!
! 1lvc, but there are various other corrosion factors, and this [1. It is thought that these corrosion factors overlap. In addition, the inside of the composite pipe is coated with corrosion-resistant metal J^
9 alloy is used, allowing the flow of corrosive liquids.

Furthermore, if a heat exchanger coated with aluminum or aluminum alloy is heated to form a diffusion layer (alloy layer) between the materials of each part of the heat exchanger and the aluminum or aluminum alloy, the heat exchanger will become extremely strong. Castings and Nao).

Moreover, the material forming the heat exchanger according to the present invention can not only be made extremely thin, but also has high strength.
These materials (the various materials mentioned above) can be used in various combinations. b=, where the wall in FIG. 6 is omitted,
Embodiment (The children are exactly the same as the explanation in FIG. 6.

Although the columnar bodies 1 are placed on the bottom plate 7 in FIGS. 1, 6, and 5, for example, the columnar bodies may be placed inside the outer shell 5 with a heat-resistant and corrosion-resistant mesh. May be suspended, columnar body 1
It is also possible to make it about half the length.

As explained above, according to the heat exchanger according to the present invention,
Since it is made of aluminum or aluminum alloy, it has extremely good thermal conductivity, and alumina is formed on the surface, so it has excellent corrosion resistance. Also, the inside of the composite tube is made of corrosion-resistant metal 1 alloy, so it is resistant to corrosion. strong and
Moreover, it is lightweight and has extremely excellent performance as a heat exchanger.

Fig. 4 is a partially cutaway schematic diagram when the heat exchanger according to the above is applied to an instantaneous water heater, Fig. 4 is a sectional view of the water supply part (drainage part), Fig. 5
The figure is a schematic view showing another example, and FIG. 6 is a perspective view of a conventional heat exchanger.

1 - columnar body, 2 - spiral tube, 3 - support body.

4-water supply part, 5-outer shell, 6-wall, 7-bottom plate, 8-burner, 9-inlet, 10-chimney, 11-drainage part, 12-coating, 13-attachment part.

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 by having a structure in which a plurality of the above composite tubes are vertically arranged and wound in a spiral shape, and the columnar body, composite tube, support body and outer shell of this assembly are coated with aluminum or an aluminum alloy. vessel,