JPH018875Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat exchanger equipped with a large number of capillary tubes, and is intended to protect the capillary joints.

In general, the thin tube fittings of this type of heat exchanger are exposed to high-temperature exhaust gas, so there is a problem in that they tend to deteriorate and require the use of expensive materials. There was also the problem that expansion and contraction occurred due to temperature changes associated with ignition and extinguishing, and that metal-to-metal friction caused noise during contraction. The higher the temperature of the chewing part heated during combustion, the louder the sound will be.

The present invention eliminates such problems, and one embodiment thereof will be described below with reference to the drawings.

In the figure, 1 is the burner section, which has a built-in kerosene vaporization section and a combustion blower, where the kerosene sent from the oil pipe 2 is vaporized and mixed with the air sent by the blower. and burn it. The flame is formed in the combustion chamber 3, and the high-temperature exhaust gas enters the exhaust box 4 and flows into the capillary tube 5 through the engagement between the box wall 4a and the capillary tube 5. The air then passes through an exhaust box 6 attached to this thin tube 5, passes through an exhaust pipe 7, and is discharged outside from an air supply/exhaust pipe (not shown) or the like.

Here, the temperature of the exhaust gas entering the exhaust box 4 is approximately 600 to 800°C. Therefore, in order to protect the engaging part and its surrounding area from this high-temperature gas, this heat exchanger has a heat-resistant layer that is thicker than the height h of the engaging part on the inner surface of the exhaust box wall 4a, that is, on the entire engaging side with the thin tube 5. A protective seal 8 (asbestos board, etc.) is provided. A hole 8a slightly larger than the bite diameter is formed at the part of the gasket 8 that comes into contact with the bite part. When this heat-resistant gasket 8 is exposed to high-temperature exhaust gas, the binder therein disappears, and when used for a long period of time, it gradually becomes thinner and cracks, and there is a risk that it will not be able to provide sufficient protection. For this purpose, this heat exchanger is further provided with a gasket protection plate 9 to protect the gasket, and a gas passage hole smaller than the inner diameter of the thin tube 5 is formed in a portion corresponding to the bite hole of the thin tube 5.

In the above configuration, the exhaust gas entering the exhaust box 4 is focused at the gas passage hole 9a of the protection plate 9 and enters the thin tube 5. At this time, since the gap between the gas passage hole 9a and the capillary part is small, the exhaust gas flows directly into the capillary tube 5 without touching the part. Therefore, the temperature of the biting part is much lower than that of the conventional one. Also, due to the presence of the gasket 8, the side wall 4a of the exhaust box 4 is also
As the temperature decreases (below about 450°C), cheaper materials such as aluminized steel plates can be used.

The reason why the gasket 8 is made thicker than the height h of the bite is to prevent the bite from coming into contact with the protective plate 9 and causing the bite to become hot. However, if the gasket 8 is made too thick, the gas passage hole 9a of the protective plate 9 and the gripping portion will be too far apart, and the exhaust gas that has been concentrated in the gas passage hole 9a will spread out after passing through the gas passage hole 9a, causing the gas passage hole 9a to spread and become jammed. It should not be too thick as it may touch the skin. According to experiments, about 1 mm is appropriate.

FIG. 3 shows another embodiment, in which the edge of the gas passage hole 9a protrudes toward the narrow tube side and overlaps with the narrow tube engagement portion. According to this configuration, the exhaust gas can be guided into the thin tube 5 without coming into contact with the jaw part, and the temperature of the jaw part can be lowered more reliably.

As is clear from the above description of the embodiments, according to the present invention, it is possible to lower the temperature of the capillary part of the thin tube, reduce costs by using inexpensive materials, and reduce noise generation due to thermal contraction.
Furthermore, since the present invention uses a tangible gasket with a hole larger than the capillary tube, the installation of this gasket is extremely easy, which improves productivity and further reduces costs. There is something big about it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a heat exchanger according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part thereof, and FIG. 3 is an enlarged sectional view of the main part showing another embodiment. DESCRIPTION OF SYMBOLS 1... Burner part, 4... Passage part (exhaust box), 4a... Wall plate, 5... Thin tube, 8... Packing, 9... Protective plate, 9a... Gas passage hole.

Claims (1)

[Claims for Utility Model Registration] (1) In a heat exchanger consisting of a passage through which exhaust gas from the burner passes, and a number of thin tubes that are clamped and fixed to the wall plate of this passage, the narrow tubes are clamped and fixed. A heat-resistant tangible gasket that is thicker than the height of the capillary tube and a protective plate for fixing the gasket are arranged on the inner surface of the passage wall plate, and the gasket has a diameter larger than the capillary portion at the portion facing the capillary portion of the capillary tube. A heat exchanger in which a gas passage hole with a diameter smaller than that of the capillary is formed in a portion of the protective plate facing the capillary. (2) The heat exchanger according to claim 1, wherein the gas passage hole of the protection plate has an edge bent toward the capillary capping portion so as to overlap the capillary capping portion.