JPH0842915A - Fin and heat exchanger for hot water supplier - Google Patents

Abstract

PURPOSE:To prevent a circulating heating heat transfer tube from being deteriorated for ensurance of long life by preventing the circulating heating heat transfer tube from being excessively raised in its temperature in hot water supply single operation. CONSTITUTION:A fin 40 has a plurality of through-holes (7 in the present embodiment) in each of which an upper through-hole (first through-hole) 42 and a lower through-hole (second through-hole) 44 are communicated with each other into a tumbler shape. An opening 48 is provided in close vicinity with the upper through-hole 42. A circulating heating heat transfer tube is inserted into the upper through-hole 42 and a hot water supply heat transfer tube is inserted into the lower through-hole 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin used in a heat exchanger of a one-can, two-circuit water heater, and more specifically, a fin for circulating heat and a heat exchanger for hot water. Regarding fins. The invention also relates to an improvement of this heat exchanger.

[0002]

2. Description of the Related Art Conventional example (Japanese Utility Model Laid-Open No. 5-54953)
The configuration of the 1-can 2-circuit water heater will be described with reference to FIG.

A heat exchanger 16 is constructed by integrating a heat transfer tube 10 for circulation heating (that is, for additional heating) and a heat transfer tube 12 for hot water supply via fins 14. The fins 14, the heat transfer tube 10 for circulation heating, and the heat transfer tube 12 for hot water supply are brazed.

A burner 18 for heating the heat exchanger 16
Is located above the heat exchanger 16 in FIG. 3, but may be located below the heat exchanger 16.
Reference numeral 20 is an outflow pipe for sending bath water from the heat exchanger 16. Two
Reference numeral 2 is a return pipe to the heat exchanger 16, and a circulation pump 24 is interposed in the middle thereof to form a circulation circuit with the bath 26. A hot water supply circuit 28 sends hot water from the heat exchanger 16 to a hot water tap provided in a kitchen, a washroom, or the like.

FIG. 4 shows a conventional method (for example, Japanese Patent Laid-Open No. 5-3027).
FIG. 57 is a front view showing a fin 30 of Japanese Patent No. 57). The fin 30 is provided with a plurality of through holes 32 in a staggered manner in two steps. Each of the through holes 32 is of a daruma type in which an upper through hole 34 and a lower through hole 36 are vertically aligned. Lower through hole 36
A hot water supply heat transfer pipe is inserted into the upper through hole 34, and a circulation heating heat transfer pipe is inserted into the upper through hole 34.

Conventionally, the hot water supply heat transfer tube and the circulation heating heat transfer tube have the same diameter.

[0007]

In this one-can, two-circuit type water heater, when the single hot water supply operation is performed, that is, the hot water supply circuit 2
8 is used for hot water supply and the circulation circuit is not used for reheating the bath 26, when the user side faucet (kitchen, washroom, etc.) is opened, the flow rate sensor works and the burner 18 starts burning. The heat generated by this combustion is transferred to the hot water supply heat transfer tube 12 and the circulation heating heat transfer tube 10 via the fins (or directly).

In this case, since water is stagnant in the circulation heating heat transfer tube 10 or is in an empty state, local heating occurs in the circulation heating heat transfer tube 10, resulting in high temperature oxidative corrosion and repeated heating and cooling. May cause thermal deterioration.

An object of the present invention is to prevent overheating of the heat transfer tube for circulation heating in such a one-can two-circuit water heater.

[0010]

The fin of claim 1 is
A fin for a heat exchanger of a two-circuit can water heater, in which a first through hole through which a circulation heating heat transfer tube is inserted and a second through hole through which a hot water heat transfer tube is inserted are provided in series. In the present fin, an opening for reducing the amount of heat transfer to the heat transfer tube for circulation heating is provided near the first through hole.

According to a second aspect of the present invention, there is provided a fin for a water heater according to the first aspect, wherein the opening is formed by cutting and raising, and the tongue portion formed by the cutting and raising faces a heat transfer tube for circulating heating. It is characterized by being provided in.

A heat exchanger according to a third aspect of the present invention is a heat exchanger for a one-can, two-circuit water heater, comprising a fin, a heat transfer tube for circulation heating inserted through a first through hole of the fin, and In a heat exchanger having a hot water supply heat transfer tube inserted into a second through hole connected to the first through hole, the circulation heating heat transfer tube has a smaller diameter than the hot water supply heat transfer tube. It is a thing.

[0013]

In the fin of claim 1, since the heat transfer pipe for circulation heating is provided with an opening in the vicinity of the heat transfer pipe for circulation heating, the heat transfer amount to the heat transfer pipe for circulation heating is reduced, and the temperature rise of the heat transfer pipe for circulation heating is prevented. It

In the heat exchanger of claim 2, the diameter of the heat transfer tube for circulation heating is made smaller than the diameter of the heat transfer tube for hot water supply, so that the heat transfer amount to the heat transfer tube for circulation heating is reduced and the heat transfer tube for circulation heating is reduced. Excessive temperature rise of the heat pipe is prevented.

[0015]

EXAMPLES Examples will be described below with reference to the drawings. FIG. 1 is a front view of the fin 40 according to the embodiment, and FIG. 2 is a perspective view of the relevant part. This fin 40 also has an upper through hole (first through hole) 42 and a lower through hole (second through hole) 44.
A plurality of dharma-type through holes 46 (7 in this embodiment) are provided. An opening 48 is provided near the upper through hole 42. In this embodiment, the opening 48
Is formed by making a U-shaped cut in the fin 40 and cutting and raising the tongue piece portion 50. This tongue part 5
0 is provided so as to face the heat transfer tube for circulation heating.

A circulation heating heat transfer tube is inserted through the upper through hole 42, and a hot water supply heat transfer tube is inserted through the lower through hole 44. Then, the brazing material is inserted into the small cutout portion 52 provided at the edge of the through hole, the brazing material is melted by heating, and is permeated between the outer peripheral surface of the heat transfer tube and the inner peripheral surface of the through hole. Then, the fins 40 and the heat transfer tubes are brazed by cooling.

By providing the opening 48 in this way,
As shown by the arrow in FIG. 9, the heat transfer amount to the circulation heating heat transfer tube is reduced as compared with the conventional example, and it is prevented that the circulation heating heat transfer tube is excessively heated during the hot water supply independent operation. . By providing the tongue piece portion 50 so as to face the circulation heating heat transfer tube, it becomes difficult for the combustion gas to hit the circulation heating heat transfer tube, and the amount of heat transfer to the circulation heating heat transfer tube is further reduced. .

In the embodiment shown in FIGS. 1 and 2, the tongue piece 50 is used.
The opening 48 is formed by cutting and raising the
The opening 49 may be formed by punching or the like like the fin 40A in the figure. Further, the numbers, sizes, and shapes of the openings 48, 49 may be other than those shown in the drawing. For example, a small opening smaller than the illustrated openings 48 and 49 is used as the upper through hole 42.
You may provide many so that it may surround.

FIG. 5 is a front view of a fin used in the heat exchanger according to the embodiment, and FIG. 6 is a perspective view of a main part of the heat exchanger using this fin.

This fin 60 also has a dharma type through hole 66 in which an upper through hole (first through hole) 62 and a lower through hole (second through hole) 64 are connected.

The upper through hole 62 has a smaller diameter than the lower through hole 64, and the circulation heating heat transfer tube 68 inserted through the upper through hole 62 is smaller than the hot water supply heat transfer tube 70 inserted through the lower through hole 64. Has become. Reference numeral 72 in FIG. 5 shows a notch for inserting the brazing material.

In the heat exchanger thus constructed, the circulation heating heat transfer tube 68 has a smaller diameter than the hot water supply heat transfer tube 70.
Heat transfer to 8 is small. As a result, it is possible to prevent the temperature of the heat transfer pipe 68 for circulation heating from being excessively increased during the single hot water supply operation.

In the embodiment shown in FIGS. 5 and 6, the diameter of the heat transfer tube for circulating heating is preferably about 50 to 90% of the diameter of the heat transfer tube for hot water supply, and more preferably about 70 to 85%.

In the present invention, as in the fin 60A shown in FIG. 7, the opening 48 (or 49) is formed in the vicinity of the small-diameter upper through hole 62.
The heat transfer amount to the heat transfer tube for circulation heating may be further reduced by providing.

[0025]

As described above, according to the fins for the water heater and the heat exchanger of the first, second, and third aspects, an excessive temperature rise of the heat transfer tube for circulation heating is prevented during the independent operation of the hot water supply. It is possible to prevent deterioration of the heating heat transfer tube and prolong the life of the heating heat transfer tube.

[Brief description of drawings]

FIG. 1 is a front view of a fin according to an embodiment.

FIG. 2 is a perspective view of a main part of the fin shown in FIG.

FIG. 3 is a system diagram of a conventional one-can two-circuit water heater.

FIG. 4 is a front view of a conventional fin.

FIG. 5 is a front view of the fin 60 according to the embodiment.

FIG. 6 is a perspective view of a main part of the heat exchanger according to the embodiment.

FIG. 7 is a front view of a fin 60A according to an embodiment.

FIG. 8 is a front view of the fin 40A according to the embodiment.

FIG. 9 is a schematic view showing a heat transfer state in fins.

[Explanation of symbols]

 14,30,40,40A, 60,60A Fin 42,62 Upper through hole (first through hole) 44,64 Lower through hole (second through hole) 46,66 Dharma type through hole 48,49 Opening 50 Tongue piece 68 Heat transfer tube for circulation heating 70 Heat transfer tube for hot water supply

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Yamazaki 5-1-1, Koiehoncho, Tokoname City, Aichi Prefecture Inax Co., Ltd.

Claims (3)

[Claims] 1. A fin for a heat exchanger of a one-can two-circuit water heater, which has a first through hole through which a circulation heating heat transfer tube is inserted and a second through hole through which the hot water heating heat transfer tube is inserted. A fin for a water heater, which is provided with a hole and is provided with an opening near the first through hole for reducing a heat transfer amount to a heat transfer tube for circulation heating. 2. The method according to claim 1, wherein the opening is formed by cutting and raising, and the tongue piece portion formed by the cutting and raising is provided so as to face the heat transfer tube for circulation heating. Fins for water heaters. 3. A heat exchanger for a one-can two-circuit water heater, comprising fins, a circulation heating heat transfer tube inserted into a first through hole of the fin, and a heat pipe connected to the first through hole. A heat exchanger comprising a hot water heat transfer pipe inserted through a second through hole, wherein the circulation heating heat transfer pipe has a smaller diameter than the hot water heat transfer pipe.