JPS58108389A - Heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a heat exchanger of light weight having an excellent corrosion resistance and an improved heat exchanging efficiency by a construction wherein a plurality of tubes arranged in a juxtaposed manner are spirally wound through support members fitted to a columnar member and an outer shell and then the plurality of tubes are arranged longitudinally and spirally wound thereby forming a heat exchanger assembly and the assembly is clad with aluminium, etc. CONSTITUTION:The arrangement is made such that a plurality of tubes 2 arranged in a juxtaposed manner are spirally wound through support members 3 fitted to a columnar member 1 or an outer shell 5 and a plurality of tubes 2 are arranged longitudinally and spirally wound to form a heat exchanger assembly, and the columnar member 1, tubes 2, support members 3 and the outer shell 5 of the assembly are clad with aluminium or an aluminium alloy. The reason why aluminium or an aluminium alloy is used for cladding is that excellent heat conductivity and corrosion resistance can be obtained and also the tubes 2, support members 3 and columnar member 1 can be rigidly and closely secured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention 1ili4 relates to a heat exchanger 1m8)K, and more particularly,
Light, with excellent corrosion resistance, and heat exchange efficiency of 0jLif1
This relates to heat exchange IIIK.

Heat exchangers used in general applications, such as instantaneous water heating, are made of copper or copper alloys, and copper and copper alloys have good thermal conductivity. O has a good heat exchange rate, but if it is heavy, it may cause problems.63
In addition, since combustion of city gas, t, or propane gas may cause corrosion, the inner thickness must be increased, which poses the problem of increased weight.

In addition, a heat exchanger 4 that uses the exhaust gas of a boiler that converts oil, crude oil, etc. into m@ in plating factories, cleaning shops, etc. that use large amounts of steam, and sulfur content in combustion gases such as oil, crude oil, etc. Due to the effects of heat exchangers, the heat exchangers were severely corroded and had to be replaced frequently.

For example, in a heat exchanger made of copper or copper alloy as shown in Fig. 6, the high temperature combustion gas passes through the box-shaped body 20 in the direction of the arrow while exchanging heat with water in the tube 21. However, as mentioned above, it is necessary to make the box-shaped body 20 thick in order to prevent corrosion69, the weight is heavy, and the heat exchange efficiency cannot be said to be good.

The present invention was developed in view of the current state of heat exchangers as described above.7'j4
(7) Provide a heat exchanger that has excellent corrosion resistance against combustion gases such as city gas, propane gas, oil, crude oil, and heavy oil, and also has outstanding heat exchange efficiency. It is something to do.

The feature of this heat exchanger is that multiple tubes arranged in parallel are wound spirally through a support attached to a columnar body or outer shell, and then these multiple tubes are It has a structure of 111 turns in a spiral pattern, and the pillars and tubes of Jin's Marobuntai. The support and the outer shell are sometimes coated with an aluminium or an aluonium alloy.

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

In the heat exchanger according to the present invention, materials for the columns, supports, spiral tubes, etc. will be explained.

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, such as pure iron, iron alloys, stainless steel, corrosion-resistant metals, alloys, steel, copper alloys, aluminum, aluminum alloys, etc. can be used. However, if the columnar body is hollow inside and has a pipe network at both ends, such as a cylindrical body or a square cylinder, the heat exchanger can be made lighter;
Moreover, it is convenient because it saves materials.

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

The material of the tube is preferably Fe-based material, such as pure iron,
Ferrous alloys, non-rusting steels, steel, corrosion-resistant metals or alloys, and
Steel, copper alloy, aluminum alloy, aluminum alloy, etc. can be used. Corrosion-resistant metals or alloys include Tit Zr*
T4 Mol Nb + Tit Zr* Ta.

Mo, Nb alloys, stainless steel, copper and copper alloys, and -
, aluminum, and aluminum alloys can be used.

Therefore, in the heat exchanger according to the present invention, the shape of the tubes is such that first, the tubes are closely connected in parallel and turned around the enclosure of the columnar body in a spiral shape of 1/CWA, and are supported at multiple locations by supports. The higher the number of spirals, the better, but it should be selected appropriately based on the heat exchanger, the strength of the material, etc.Furthermore, the number of spirals arranged in parallel can be wound in a ** shape. Therefore, the plurality of tubes are wound in a spiral shape in a column KM to form a column of spiral tubes.Although it is preferable to have a large number of windings, the number of turns should be selected appropriately based on the heat exchange rate and the strength of the material. It is better.

Further, the outer shell is preferably made of a heat-resistant and corrosion-resistant material similar to that of the columnar body, and is preferably made of the same material as the columnar body.

The reason why aluminum acid or aluminum alloy is used for the coating is that it has good thermal conductivity, is resistant to corrosion, and that if the pipe, gap, column, or shaped body is tightly attached, it will be It depends on what you can do. Corrosion resistance is further improved when the aluminum alloy contains about 5% or less iron. In order to apply such a coating of aluminum or aluminum alloy, the aluminum or aluminum alloy must be melted before applying this coating. A structure is created in which tubes arranged in parallel in molten aluminum or aluminum alloy are spirally wound several times through a support, and then the plurality of tubes are arranged vertically and wound in a spiral. A heat exchanger is completed by soaking the columnar bodies and then pulling them out to dry.

In addition to this method, the columnar body, the support, and the parallel and vertical spiral tubes are separately coated with aluminum alloy as described above, and then the parallel and vertical spiral tubes are supported. After installing it on the columnar body through the tube, it is heated in a heating furnace to bring the tube, support, and columnar body into close contact with each other to form a heat exchanger.

The inside of the bottle and outer shell are also coated in the same manner as above.

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

Figure 1 is a side view of a heat exchanger according to the present invention, and Figure 2 is a side view of a heat exchanger according to the present invention.
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, and Fig. 4 shows the water supply section of the spiral pipes on the parallel side and the vertical side. FIG. 5 shows another example, and FIG. 6 is a perspective view of a conventional heat exchanger.

In FIGS. 1 and 2, supports 3 are attached in two-figure shapes at multiple locations (5 locations in FIG. 1) on the columnar body 1, for example, by welding, etc., and a spiral shape is formed between the supports 3, 3. Tube 2.2.
2 (Three tubes are shown in Fig. 1, but any number of tubes may be used as long as there are two or more). This support 3.6 is the first
Although it is U-shaped in the figure, it may be supported on a single support 3, and although the support 6 is defeated by the columnar body 1 in FIG. may be attached to the outer shell 5 (see 5th WJ). Then, an aluminum ξ dimer and an aluminum alloy coating 12 are provided.

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, the columnar body, and the outer shell, and columnar body 1
It is necessary to provide such a width that it is sandwiched by KT within the distance between the outer shell 5 (FIG. 3) and the outer shell 5 (FIG. 3). As will be described later, this is to cause the high temperature fluid, for example, combustion gas, to flow in a spiral pattern and to make sufficient contact with the spiral tubes 2, 2.degree.2. Further, these parallelly arranged next spiral tubes 2. 2. 2 is wound an appropriate number of times to form a parallel spiral tube, and then the plurality of tubes 2. 2. 2 is made into a vertical Kflt solid state, and this is spirally wound to form the vertical spiral tubes 2, 2.2. Heat exchange is also performed to form these two parallel, vertical spiral tubes 2, 2.2.
This further improves heat exchange efficiency.

FIG. 3 shows an example of an instantaneous water heater incorporating the heat exchanger of FIG. Parallel helical tubes supported by 2. 2. A columnar body 1 is mounted on which a columnar body 1 is provided with a columnar spiral IF2, 2°2 mounted on a mounting portion 13. In this case, parallel spiral tubes 2.2.2
are in close contact with each other, and no fluid passes between the columnar body 1 and the outer shell 5, and the fluid flows spirally as shown by the arrow. .2 tandem spiral tubes in close contact with the underside of 2. 2. 2 is placed on the lower mounting part 12 of the outer shell 5 so that it is close to a heat source, for example a gas burner 8. . In this way, parts of the parallel helical tubes 2, 2.2 are attached to the support 3 and also the tandem helical tubes 2. 2. The second part is supported by a mounting part 13. The above-mentioned J5 includes an aluminum alloy stand and an aluminum alloy coating 12. A plurality of gas nozzles 8 are provided on this bottom plate 7, and gas G is supplied thereto.
In addition, an air passage may be formed by the outer shell 5 and the wall 6, and air may be sent from the inlet 9 to the gas burner 8 in the direction of the arrow. This promotes combustion of the gas as heated air is sent. In addition, as shown in FIGS. 5 and 6, the bottom plate 7
．． It is also preferable to provide the mounting portion 13 with a coating 12 of aluminum or aluminum alloy.

In addition, in the case of sending a liquid, for example, water to the vertical spiral pipe 2.2.2, the one shown in Fig. 4 can be used for either water supply or drainage, but water W is) (Eve P Water supply section 4
from which it is first sent to the tandem spiral tube 2, 2.2 and then to the parallel spiral tube 92.2.2,
The water heated by heat exchange is passed through the parallel spiral pipes 2, 2.2.
It collects in the water supply part 4 (which becomes the drainage part 11) from the end and is discharged from the nokub P.

In the instantaneous water heater using the heat exchanger according to the present invention having such a configuration, by first supplying water W to the water supply section 4, the tandem spiral tubes and the parallel spiral tubes 2. 2. When the gas G flows through the interior and reaches the drainage part 11,
When the gas nozzle 8 is ignited, the combustion gas flows, as shown by the arrow, first from the skin surrounded by the vertical spiral tubes 2, 2.2, and then into the parallel spiral tubes 292, 2.
The high temperature combustion gas exchanges heat with the water flowing in the vertical and parallel spiral pipes 2, 2.2, and drains into the drainage section. The water H flowing into the chimney 11 reaches a temperature of approximately 80° to 90°C and is drained for use, while the molten gas is discharged from the chimney 10 at a low temperature of approximately 50°C. In this way, since the contact area between the high temperature combustion gas and the vertical and parallel spiral tubes is extremely large, the heat exchange rate between the combustion gas and the water flowing in the vertical and parallel spiral tubes is also large. heated and drained,
The temperature of the water being poured is high, and the exhaust combustion gas is also extremely low. Note that even if the heat exchanger of the present invention is combined with a boiler, it is the same as the upper 8 pi.

However, in the heat exchanger according to the present study, the columnar bodies,
Since the spiral tube, support, outer shell, etc. are coated with aluminum or aluminum alloy, it can be used in water heaters that use not only city gas and propane gas, but also oils such as petroleum, crude oil, and heavy oil. In the boiler, the combustion gas contains yellow components, and the working hook gas is a gas at the lower part of the columnar body 1 due to its high temperature, but near the upper part of the columnar body 1 and the support body 3,
The parallel spiral tubes and the vertical spiral tube (part) 2 have many water bottles containing sulfuric acid attached to them, and the outer shell 5
is in the same condition. However, since it has a coating of aluminum or aluminum alloy, it does not corrode the metal or alloy material under the coating, and it can last for an extremely long time. You can use it at any time. Although this explanation relates to corrosion caused only by the sulfur content in the combustion gas, it is thought that various other corrosion factors exist and these corrosion factors overlap.

Furthermore, if a heat exchanger coated with aluminum or aluminum alloy is heated to create a diffusion layer (alloy layer) between the material of each part of the heat exchanger and aluminum or aluminum alloy, the heat exchanger will become extremely It becomes a strong structure.

Further, the material constituting the heat exchanger according to the present invention can be made extremely thin and has high strength.

These materials (the various materials mentioned above) can be used in various combinations.

Fig. 5 shows another example of a water heater to which the heat exchanger according to the present invention is applied, and the wall in Fig. f6 is omitted, but the embodiment is exactly the same as the explanation in Fig. t3. .

1, 3, and 5 are examples in which the columnar body 1 is placed on the bottom plate 7. 1 may be suspended, or the length of the columnar body 1 may be reduced to about half.

As explained above, according to the heat exchanger according to the present invention,
Since it is coated with aluminum (TAU) and aluminum (S) alloy, it has extremely good thermal conductivity, and has an aluminum layer formed on the surface, which provides excellent corrosion resistance.
It has extremely excellent performance as a heat exchanger.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the heat exchanger according to the present invention, Fig. 2 is a view from the direction of arrow A in Fig. 111, and Fig. 3 shows the heat exchanger according to the present invention applied to an instantaneous water heater. FIG. 4 is a cross-sectional view of a water supply section (drainage section), FIG. 5 is a schematic diagram showing an example of a cage, 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 - #l protrusion, 11 ~Drainage section,
12 to II, S with b5t+-.

Claims (1)

[Claims] The multiple tubes that can be played in parallel are wound spirally through a support attached to a columnar body or outer shell, and then the multiple tubes are INK! 1. A heat exchanger having a spirally wound structure, and having a columnar body, a tube, a support body, and an outer shell tube covered with an aluminum or aluminum alloy.