JPH0245785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger, and more particularly to a heat exchanger with extremely high heat exchange efficiency.

In general, heat exchangers used for instantaneous water heating, etc., are generally made of copper or copper alloys. Copper and copper alloys have good thermal conductivity and high heat exchange efficiency, but Since combustion of city gas, propane gas, etc. may cause corrosion, there is a problem that the heat exchanger must be thicker and heavier. For example, in the heat exchanger shown in FIG. 3, combustion gas flows inside the box 20 in the direction of the arrow and exchanges heat with the fluid flowing inside the tube 21 wound outside the box 20. However, combined with the thick wall thickness, the heat exchange efficiency is poor.

The present invention provides a heat exchanger that has much better heat exchange efficiency than the heat exchanger described as an example.

The features of the heat exchanger according to the present invention are as follows:
A plurality of tubes arranged in parallel and in close contact with each other are spirally wound and provided in close contact with the columnar body via a support attached to the columnar body, and further spirally wound in close contact with the columnar body. A plurality of tubes arranged in parallel and in close contact with each other are alternately arranged, and a plurality of tubes arranged in parallel on the outside and in close contact with each other are spirally wound and attached to the outer shell via a support attached to the outer shell. This is because they are placed close together.

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

Materials for the columnar bodies, outer shell, supports, and tubes used in the heat exchanger according to the present invention will be explained.

The columnar body can be shaped like a cylinder with both ends closed, a rectangular cylinder, a cylinder, a square column, etc., with an exhaust gas hole in the center, or a columnar body with a hollow inside and sealed at both ends. This allows the heat exchanger to be made lighter and also saves on materials. The material of this columnar body may be any heat-resistant and corrosion-resistant material, and for example, ferrous materials such as pure iron, iron alloys, stainless steel, corrosion-resistant metals, copper, copper alloys, aluminum, aluminum alloys, etc. can also be used.

The support may be rod-shaped, U-shaped, etc., and is attached to either a columnar body or an outer shell to support the pipe, so it must have enough strength to withstand the weight of the pipe and the number of attachments. The material may be the same as that of the columnar body.

The material of the tube is preferably an iron-based material, and for example, pure iron, iron alloy, stainless steel, other corrosion-resistant metals, copper, copper alloy, aluminum, aluminum alloy, etc. can also be used. This tube can be used in both single and double layers. In this double tube structure (clad pipe), for example, the inside of the tube is made of a corrosion-resistant metal, and the outside of the tube is made of an iron-based material. The opposite is also possible.

Corrosion-resistant metals can include Ti, Zr, Ta, Mo, Nb, V, and alloys thereof, and depending on the type of combustion gas and the type of liquid to be flowed, non-ferrous steel,
Copper, copper alloys, aluminum, and aluminum alloys may also be used.

However, in the heat exchanger according to the present invention,
The shape of the tube is determined by first arranging a plurality of tubes in close contact with each other in parallel, winding them in a spiral around a columnar body, and providing the tubes in close contact with each other via a support attached to the columnar body or outer shell. A columnar body or an outer shell is formed by winding a plurality of tubes in a spiral shape around the periphery of the tubes, alternating with the tubes arranged closely in parallel in parallel, and on the outside by arranging a plurality of tubes in close contact with each other in a spiral shape. It is provided in close contact with the support body attached to the base body, and is supported by a plurality of support bodies. The heat exchange efficiency improves as the number of tubes arranged in parallel and the number of tubes wound in a spiral shape increase.
It may be selected as appropriate based on the type of fuel used, the type of fluid, the strength of the material, etc.

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

In FIG. 1, supports 3 are attached to a plurality of locations on a columnar body 1 by welding or the like, and a plurality of tubes 2 are arranged in parallel around the columnar body 1 and in close contact with the supports 3 in a spiral shape. It is molded and placed in close contact with the columnar body 1. In this case, there are three pipes 2, but
As long as there are two or more, the number can be as large as technically possible, but they may be selected appropriately depending on the strength of the material, the structure of the heat exchanger, etc. Also, the support 3 may be U-shaped. Also. In FIG. 1, the support 3 is a columnar body 1.
Although it is attached to the outer shell 5, it can also be attached to the outer shell 5.

Further, a plurality of tubes 2 are closely arranged in parallel around this columnar body 1 and formed into a spiral shape, alternating with each other, and a plurality of tubes 4 are closely arranged on the outside in parallel and wound. It is placed on a support 3 attached to the inside of the outer shell 5 in close contact with the outer shell 5. In this case, the number of tubes 4 and the number of turns should be selected in consideration of the number of tubes inside.

It goes without saying that these plurality of tubes 2 and 4 must be brought into close contact with each other, but also with the tube 2 and the columnar body 1 and the tube 4 and the outer shell 5 through the support body 3. If there is a gap, combustion will occur. This is because gas and the like will leak, making it difficult for the high-temperature fluid to flow smoothly in a spiral pattern.

Note that a plurality of tubes arranged in close contact with each other in parallel and formed into a spiral shape is sometimes referred to as a spiral tube.

FIG. 2 shows a water heater incorporating the heat exchanger according to the present invention shown in FIG. That is, on the bottom plate 10 attached to the bottom of the outer shell 5, the columnar body 1 is provided with the spiral tube 2 placed on the support 3, and the columnar body 1 is provided with a spiral tube 2 placed on the support 3, and a columnar body 1 is provided on the bottom plate 10 attached to the bottom of the outer shell 5, and a columnar body 1 is provided with a spiral tube 2 placed on the support body 3, and a columnar body 1 is provided on the bottom plate 10 attached to the bottom of the outer shell 5. An outer shell 5 is provided with a helical tube 4 placed on a support 3 . Further, a plurality of gas burners 6 are provided on the bottom plate 10, and gas is supplied from a gas source 7 as shown by the arrow.
To supply water as a fluid to the water tank 9 from the water source 8 as shown by the arrow, the water is supplied from here to each spiral tube 2 and 4, and then heat exchanged to make it hot. The hot water is collected in the spiral pipes 2 and 4 in a hot water tank 11, from which it is taken out as hot water H and sent to various uses.

In the water heater using the heat exchanger according to the present invention having such a configuration, first, when the water in the water tank 9 is fed to the spiral pipes 2 and 4 and reaches the water tank 11, the gas burner 6, the combustion gas rises along the spiral tubes 2 and 4 as shown by the arrow in FIG.
The water flowing through the spiral pipes 2 and 4 exchanges heat with the combustion gas, and the water becomes hot and flows into the hot water tank 11. On the other hand, the temperature of the combustion gas is about 50 degrees Celsius or lower and the chimney 1
It is discharged from 2. In this way, since the contact area between the combustion gas and the spiral tube is extremely large, the heat exchange rate between the combustion gas and the water flowing inside the spiral tube is also large.
The temperature of the heated wastewater is high, and the combustion gas discharged is also extremely low temperature.

Although a gas burner has been described as a heating source, the present invention can also be applied to boiler exhaust gas, etc.

As explained above, since the heat exchanger according to the present invention has the above configuration, the contact area between the high temperature exhaust gas and the spiral tube is extremely large, so the heat exchange rate is also large. This has the effect that fuel can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a heat exchanger according to the present invention;
FIG. 2 is a schematic side view of a water heater incorporating a heat exchanger according to the present invention, and FIG. 3 is a perspective view of a conventional heat exchanger. 1... Column, 2, 4... Spiral tube, 3... Support, 5... Outer shell, 6... Gas burner, 7...
Gas source, 8...water source, 9...water tank, 10...bottom plate, 11...hot water tank, 12...chimney.

Claims (1)

[Claims] 1 A plurality of tubes arranged in parallel and in close contact with each other are spirally wound and provided in close contact with the columnar body via a support attached to the columnar body, and further spirally wound in close contact with the columnar body. A plurality of tubes arranged in parallel and in close contact with each other are alternately arranged, and a plurality of tubes arranged in parallel on the outside in close contact with each other are spirally wound and connected to the outer shell through a support attached to the outer shell. A heat exchanger characterized by being provided in close contact with.