JPH0460342A - Heat exchanger for hot water feeder - Google Patents

Abstract

PURPOSE:To improve heat exchanging efficiency by a method wherein a combustion chamber is formed within a heat accepting tank formed into a cylindrical shape by an inner wall surface and an outer wall surface, an outer side wall enclosing an outside part of the heat accepting tank is disposed to form an outside chimney channel and then the outside chimney channel is communicated with the combustion chamber. CONSTITUTION:A combustion chamber 1 is formed within a heat accepting tank 2 formed into a cylindrical shape with an inner wall surface 3 and an outer wall surface 4. A burner B is communicated with an end surface 1a of the combustion chamber 1, an outer side wall 9 enclosing an outside part of the heat accepting tank 2 is disposed to form an outer chimney channel 10 and at the same time the outside chimney channel 10 is communicated with the combustion chamber 1. With such an arrangement, a thermal conducting area is increased to increase a heat exchanging efficiency and then the size of the heat exchanger can be reduced.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a heat exchanger for a water heater.

(50), as shown in FIG.
The heat receiving tank (55) is surrounded by a heat receiving tank (55) having a hot water outlet (53) and an outlet (54), and the high temperature combustion gas generated by the burner passes through the inner wall surface (56) of the heat receiving tank (55). 52
), and in order to expand the heat transfer area, the inner wall surface (56) is formed into a corrugated shape.

In addition, as in the heat exchanger (60) shown in FIGS. 6 and 7, a combustion chamber (62) provided with a burner connection port (61) on the side wall.
) is provided with a heat receiving tank (65) provided with a water supply port (63) and a hot water outlet (64), and a combustion chamber (62) is installed in the heat receiving tank (65).
) and a large number of smoke pipes (66) communicating with it in the vertical direction,
There is also one with a further expanded heat transfer area than the above.

Further, such a heat exchanger is generally assembled from members formed by sheet metal processing by means such as welding.

(b) Conventional technology Conventionally, heat exchangers for water heaters using petroleum, etc. as fuel (c)
Problems to be Solved by the Invention However, the above-mentioned conventional techniques have the following unresolved problems.

That is, in the case shown in Figure 5, the inner wall surface (56) L of the heat receiving tank (55) does not act as a heat transfer surface, so the heat transfer area is narrow, and therefore the shape is large in order to secure the heat transfer area. Become.

In addition, in the case shown in Fig. 6, the structure of the heat receiving tank (65) is complicated, the workability is poor, and the cost is high.
No. 65) has a problem in that there are many welded parts in the water-contact part, which causes problems in corrosion resistance and poor durability.

Furthermore, in both of the heat exchangers described above, the burner connection port is provided on the side wall of the combustion chamber, so the connection port and the heat receiving tank interfere with each other, making the structure complicated and making it difficult to perform welding and other processing during assembly. There is a problem.

(d) Means for Solving the Problems In the present invention, a combustion chamber is formed inside a heat receiving tank having a cylindrical shape with inner and outer walls, a burner is communicated with the end face of the combustion chamber, and the outside of the heat receiving tank is It is an object of the present invention to provide a heat exchanger for a water heater, characterized in that a surrounding external side wall is provided to form an outer flue, and the outer flue is communicated with a combustion chamber.

(E) Functions and Effects According to the present invention, high-temperature combustion gas from the burner first flows through the combustion chamber, during which it heats the water in the heat receiving tank via the inner wall surface, and then flows through the outer flue. While flowing through the same flue, the water in the heat receiving tank can be heated again through the outer wall surface.

As mentioned above, the heat of the combustion gas from the burner is transferred to the heat receiving tank using the inner and outer wall surfaces as heat transfer surfaces, increasing the heat transfer area, increasing the heat exchange rate, and increasing the heat exchange rate. It is possible to downsize the device.

In addition, by connecting the burner to the end face of the combustion chamber,
The structure of the heat receiving tank is simplified and the number of welded parts in contact with water is reduced, which improves durability.Furthermore, the connection structure is simplified because the burner connection part and the heat receiving tank do not interfere, and the three-dimensional joining line This reduces the number of welded parts between curved surfaces, which is advantageous in terms of processing and cost.

Furthermore, corrosion occurs and progresses more often in areas affected by heat due to welding than in the base metal, but in the heat exchanger of the present invention, this melted area is significantly reduced compared to conventional heat exchangers for hot water supply. As a result, corrosion resistance is improved.

(f) Examples Embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 and FIG. 2 show a heat exchanger for a water heater according to the present invention (
C) shows an oil water heater (A) equipped with (1)
is the combustion chamber, which is formed into an upright, approximately cylindrical shape,
A burner (B) is communicated with the end face (1a). (F)
is a fan that supplies air to the burner (B).

(2) is a heat receiving tank forming the side wall of the combustion chamber (1);
The inner and outer wall surfaces (3) (4), which are each formed into a substantially cylindrical shape and are arranged concentrically, and the upper and lower end surfaces (5) (5) (4) which close the gaps between the upper and lower ends of the inner and outer wall surfaces (3) (4) 6), and surrounds the side periphery of the combustion chamber (1).

(7) is a water supply pipe, which penetrates through the upper end surface (5) of the heat receiving tank (2) and reaches the lower part of the heat receiving tank (2);
(8) is a hot water outlet pipe, which communicates with the upper part of the heat receiving tank (2).

Further, on the outside of the outer wall surface (4) of the heat receiving tank (2), there is an outer side wall (9) surrounding the outer wall surface (4) while maintaining a predetermined distance therebetween.
) to form an outer flue (lO), the upper end of which is in communication with the upper part of the combustion chamber (1) through a baffle plate (moon).

(S) is an exhaust port (12) installed at the bottom of the outer flue (lO).
) and an exhaust pipe (13) at the top.
has been established.

Further, the outer flue (10) is provided with a swirling indoor plate (10a) to improve heat transfer efficiency, and the flue gas is guided to the silencer (S).

The embodiment of the present invention is configured as described above, and the high temperature combustion gas from the burner (B) receives heat through the inner wall surface (3) while flowing upward in the combustion chamber (1). The water in the tank (2) is heated and guided to the outer flue (10) by the baffle plate (11), and while flowing downward through the flue (10), it is heated through the outer wall surface (4) and heated to the heat receiving tank. (2) After the water inside is heated again, it is led to the silencer (S) from the exhaust port (12) and is discharged to the outside from the exhaust pipe (13).

As mentioned above, the heat of the combustion gas from the burner (B) is transferred into the heat receiving tank (2) using the inner and outer wall surfaces (3) and (4) as heat transfer surfaces, and the heat transfer area is approximately 2 This increases the heat exchange rate by two times, thereby increasing the heat exchange efficiency and making it possible to downsize the heat exchanger (A).

In addition, the exhaust gas is discharged to the outside via the silencer (S), but since the heat exchanger has been made smaller, the silencer (S)
It is easy to install, and combustion noise is reduced, resulting in quiet operation.

In addition, by connecting the bath (B) to the bottom surface (1a) of the combustion chamber (1), the structure of the heat receiving tank (2) is simplified, and the number of welded parts in contact with water is reduced, increasing durability. Furthermore, the connection structure is simplified without interference between the burner connection part and the heat receiving tank (2), and the number of welded parts on the cylinder is generally reduced, which improves processing, cost, and durability. be advantageous in terms of

3 and 4 show another embodiment, in which a heat exchanger is wound in a coil shape in the heat receiving tank (32) of the heat exchanger (CI) of the oil water heater (At) configured in the same manner as described above. Chubu (33
), and the heated water in the heat receiving tank (32) heats the water flowing through the heat exchange tube (33), and the water in the heat receiving tank (32) and the heat exchange tube (33) It is possible to heat both types of water without mixing them with the water inside. For example, the hot water in the heat receiving tank (32) can be used for cooking, etc., and the heat exchange tube (33) can be connected to the bathtub. By circulating the water in the bathtub, the water in the bathtub can be heated indirectly without causing sanitary problems.

Note that the heat exchanger according to the present invention is not limited to the oil water heater shown in the embodiment, but can also be applied to a gas combustion type water heater or a water heater using solid fuel as a heat source.

Furthermore, the location where the burner communicates with the combustion chamber is not limited to the bottom surface of the combustion chamber, but may also be the top surface.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of an oil water heater having a heat exchanger according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a partially cutaway side view of another embodiment of the oil water heater, Figure 4 is the same plan view,
5 and 6 are longitudinal cross-sectional views of a heat exchanger according to the prior art, and FIG. 7 is a cross-sectional view taken along the line II in FIG. 6. (A): Oil water heater (B) ・Burner (C): Heat exchanger (1): Combustion chamber (1a): End face (2): Heat receiving tank (3): Inner wall surface (4): Outer wall surface (9 ): External side wall (10): External flue diagram

Claims (1)

[Claims] 1) A combustion chamber (1) is formed inside a heat receiving tank (2) having a cylindrical shape with inner and outer walls (3) and (4).
A burner (B) is communicated with the end face (1a) of the heat receiving tank (
2) is provided with an external side wall (9) surrounding the outside to form an external flue (10), and the external flue (10) is connected to the combustion chamber (1).
A heat exchanger for a water heater, characterized by communicating with the heat exchanger.