JPH0350368Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a boiling prevention structure for a heat exchanger used in water heaters, bathtubs, etc.

[Conventional technology]

A heat exchanger for heating water supply used in water heaters, bathtubs, etc. has a plurality of heating pipes 1 as shown in Figure 4.
A plurality of fins 2 are attached to the fins 2, and the fins 2 are heated from below by a gas burner 3 to heat the water passing through the heating tube 1. The fin 2 is
As shown in FIGS. 5 and 6, the predetermined wall thickness a
The material is punched out to the specified size by punching process,
Form a spacing cylinder 2a of a certain height b by burring or the like from the direction of arrow A, and set the inner diameter of the spacing cylinder 2a to a size that allows it to be externally fitted onto the heating tube 1, and then form the desired number of spacing cylinders 2a. The fin spacing cylinder 2a is fitted onto the heating tube 1, and as shown in FIG. There is.

[The problem that the idea aims to solve]

However, in the conventional heat exchangers for water heaters and the like as described above, the wall thickness of the heating tube 1 is generally made thin in consideration of economic efficiency, so the temperature distribution during heating is not uniform. There is a high possibility that the side facing the burner will reach a high temperature and boil, and if it boils, it will generate abnormal noise. As a countermeasure for this, the thickness of the heating tube is increased to make the temperature distribution uniform, or as shown in FIG. Efforts have been made to make the temperature distribution uniform by increasing the heat capacity of the tube 1 on the side facing the burner, but both methods have the problem of increasing costs.

The present invention improves the problems of the heat exchanger used in conventional water heaters, etc. as described above, and eliminates the need to increase the thickness of the heating tube or to fix the metal round rod to the heating tube. Another object of the present invention is to provide a heat exchanger that can prevent local boiling.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, this invention
In a heat exchanger for hot water supply, etc., in which a plurality of fins each having a spacing cylinder are externally mounted and fixed to a heating tube, and the fins and the heating tube are heated by a burner to heat water passing through the heating tube. The height of the spacing cylinder of the fins on the side facing the burner is such that the fins can be attached to the heating tube while maintaining a predetermined spacing, and the height of the spacing cylinder on the side opposite the burner is increased. It is characterized by successively lower levels.

[Effect]

As mentioned above, in the present invention, the height of the spacing cylinder on the side facing the burner is such that the fins can be attached to the heating tube while maintaining a predetermined spacing. Since the height of the cylinder is gradually lowered, the fins can be attached to the heating tube while maintaining a predetermined interval, and the heat capacity of the fins that fit onto the heating tube is the largest on the side facing the burner.
It gradually becomes smaller towards the side opposite the burner, and for this reason, it is necessary to thicken the wall of the heating tube or install a round rod to increase the heat capacity inside the heating tube on the side facing the burner. Even if it is not fixed, the heating tube can be heated almost uniformly over its entire circumference, thereby preventing the side facing the burner from becoming extremely hot and boiling.

〔Example〕

Next, one embodiment of the present invention will be explained with reference to FIGS. 1 to 3.

FIG. 1 is a partial side view showing the main parts of a heat exchanger to which the present invention is applied, FIG. 2 is a front view of the fins, and FIG. 3 is a side view of FIG. 2.

In FIGS. 1 to 3, 1 is a heating tube of a heat exchanger, and 20 is a fin fitted onto the heating tube 1. In FIG.

The fins 20 are formed by punching a heat-resistant steel plate or the like having a thickness a into a predetermined size, and then forming a spacing holding cylinder 2 of a size that can be fitted onto the heating tube 1 by burring or the like.
0a is formed. In the present invention, as shown in FIG. 3, the spacing cylinder 20a of the fins 20 has a height of b on the side 20b facing the burner so that the fins are attached to the heating tube with a predetermined spacing, and The height of the side 20c is gradually lowered to the lowest c dimension.

As shown in FIG.
So that the highest side 20b of 0a faces the burner,
Further, the high side 20b of the spacing cylinder 20a abuts the adjacent fins, and the fins are fitted and fixed onto the heating tube 1 so as to maintain a predetermined spacing.

As described above, in the fin 20 of the present invention, the height b of the spacing cylinder 20a facing the burner has a predetermined spacing dimension, and the height of the spacing cylinder 20c gradually increases as the distance from the burner side 20c increases. Since the heat capacity of the fins is lower, the heat capacity of the fins is largest on the side facing the burner, and gradually decreases as it moves away from the burner. Therefore, the heating tube 1 is heated almost uniformly over the entire circumference, and the heat capacity of the fins is Only the other side can be prevented from becoming extremely hot and boiling.

[Effect of idea]

As mentioned above, the boiling prevention structure of the heat exchanger of the present invention does not require increasing the thickness of the heating tube or fixing a metal rod or the like to increase the heat capacity inside the heating tube, unlike conventional methods. It is possible to prevent the side facing the burner from becoming extremely high temperature and boiling, and it has the effect of being able to be implemented at low cost.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main parts of a heat exchanger to which the present invention is applied, FIG. 2 is a partial front view of a fin used in the present invention, and FIG. 3 is a side view of the same fin. FIG. 4 is a partial front view of a conventional heat exchanger, FIG. 5 is a partial front view of a conventional fin, and FIG. 6 is a side view thereof.
FIG. 7 is a partial side view showing the installed state, and FIG. 8 is a front view corresponding to FIG. 4 showing another example of a conventionally used heat exchanger. 1... Heating tube, 20... Fin, 20a... Spacing cylinder, 20b... Side facing the burner, 20c...
...Anti-burner side, a... Thickness of the fin, b... Height of the spacing cylinder on the side facing the burner, c... Height of the spacing cylinder on the anti-burner side.

Claims (1)

[Scope of utility model registration request] For hot water supply, bathing, and space heating, a plurality of fins having a spacing tube are fitted onto and fixed to a heating tube, and the fins and the heating tube are heated by a burner to heat the water passing through the heating tube. In such heat exchangers, the height of the spacing cylinder on the side facing the burner is such that the fins can be attached to the heating tubes while maintaining a predetermined spacing, and the spacing is maintained on the side opposite the burner. A boiling prevention structure for a heat exchanger characterized by successively lowering the height of the cylinders.