JPS607187B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger having heat absorption fins on the outside of a heat exchange pipe and through which combustion gas flows orthogonally to the heat exchange pipe. The purpose is to prevent the generation of sound.

Conventional heat exchangers of this kind have the disadvantage that when the flow rate is low, the heat exchange effect with respect to the flowing water is reduced, so that the flowing water locally becomes high in temperature, causing boiling and increasing noise.

The present invention provides a hollow pipe-like high thermal conductivity tube that is in contact with the inner surface of the heat exchange pipe, has a smaller diameter than the inner diameter of the heat exchange pipe, and is closed at both ends, in the upstream portion of the combustion gas in the heat exchange pipe. This method improves the above-mentioned drawbacks by inserting a material to uniformize the heat exchange effect on flowing water. This type of heat exchanger will be explained with reference to FIGS. 1 to 3.

A combustion chamber 2 is located upstream of the combustion gas of the heat exchanger 1, and a gas burner 3 is located upstream of the combustion chamber 2. The heat exchanger 1 is composed of a large number of heat absorption fins 5 and a heat exchange pipe 4 passing through them, and nothing is inserted into the heat exchange pipe 4.
In such a configuration, the combustion gas generated by the gas burner 3 passes through the combustion chamber 2 and exits through the gaps between the heat absorption fins 5 of the heat exchanger.

Water first absorbs heat in the combustion chamber 2, warms up to some extent, enters the heat exchanger 1, receives heat through the heat absorption fins 5 and heat exchange pipe 4, and exits as high-temperature water.
is located at the upstream part of the combustion chamber 2, so the heat exchanger 1 is heated more than the upstream part, and the temperature of the upstream part of the heat exchange pipe 4 becomes locally high, and the heat exchange effect on the flowing water is reduced. This tends to lead to non-uniformity, and since nothing is inserted into the heat exchange pipe 4, the various parts of the flowing water are not finely mixed at low flow rates, resulting in localized high temperatures, causing boiling and noise. 4 and 5 show an embodiment of the heat exchanger of the present invention, in which a member 6 with high thermal conductivity is provided in the upstream portion of the combustion gas in the heat exchange pipe 4 in contact with the inner surface of the heat exchange pipe 4.

The capital material 6 is constructed by closing both ends of a copper pipe, and both ends are individually fixed to the heat exchange pipe 4 with solder.
The length of the member 6 is approximately equal to the straight section of the heat exchange pipe 4.
The other configurations are the same as the subordinates. According to this configuration, the heat transfer area of the upstream portion of the combustion gas in the heat exchange pipe 4 increases, so that the heat exchange effect on the flowing water is made uniform, air bubbles are reduced, and noise is reduced.

Furthermore, since the passage area is small, the velocity of the flowing water is high even at low flow rates, the flowing water maintains a state of developed turbulence, and is finely mixed, reducing noise. It also improves thermal efficiency. According to one experiment, Beni B decreased at a flow rate of 360 m/h, and at this time, the running water resistance hardly increased.

Furthermore, although the flow resistance increased at high flow rates, this was not a problem in practical use. In the embodiment shown in FIGS. 6 and 7, the member is constructed of a pipe 7 with both ends crushed.

Since the end portions of this type are inclined, an increase in water flow resistance can be suppressed. According to experiments, the flow rate is 360 evening/h.
In & old yakuza decreased. As explained above, in the present invention, a member having high thermal conductivity is provided in the upstream portion of the combustion exhaust gas in the heat exchange pipe in contact with the inner surface of the heat exchange pipe, so that the heat exchange effect on flowing water is uniformized and the heat transfer efficiency is improved. Noise can be reduced at the same time as it is improved.

Brief explanation of the drawings Figure 1 is a front view of the subordinate heat exchanger assembled into the water heater body, Figure 2 is a right side view of Figure 1,
FIG. 3 is a plan view of FIG. 1.

FIG. 4 is an enlarged sectional view of the vicinity of a heat exchange pipe according to an embodiment of the present invention, and FIG. 5 is a sectional view taken along line AA in FIG. FIG. 6 is an enlarged sectional view of the vicinity of a heat exchange pipe according to another embodiment of the present invention. FIG. 7 is a sectional view taken along line BB in FIG. 6, and FIG. 8 is a perspective view of the backing material. 1... Heat exchanger, 4... Heat exchange pipe,
6... Heat absorption fins, 6, 7, 8... Bumura, 9... Fins, 10... Heat exchanger plates.

spear figure Spear 2 Evening 3 Spear 4 Game 5 diagram Spear 5 Figure 7 Spear 8

Claims (1)

[Claims] 1. Combustion exhaust gas, which is a heating fluid, flows on the outside of a hollow heat exchange pipe, passing through a large number of heat absorption fins provided on the outer surface of the heat exchange pipe, and the heated fluid flows inside the heat exchange pipe. In a heat exchanger where water flows perpendicularly to the combustion exhaust gas, the combustion exhaust gas upstream portion of the heat exchange pipe has a diameter smaller than the inner diameter of the heat exchange pipe, and both ends are connected to the combustion exhaust gas upstream portion of the heat exchange pipe. A heat exchanger characterized in that a closed hollow pipe-shaped insertion member with high thermal conductivity is attached in contact with the inner surface of a heat exchange pipe. 2. The heat exchanger according to claim 1, wherein the insertion member is a pipe with both ends crushed.