JP2949553B2 - Heat exchanger in direct-fired water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct flame which can efficiently convert water into high-temperature water by efficiently promoting heat exchange between a burning flame and water sprinkled. The present invention relates to a heat exchanger used for a water heater.

[0002]

2. Description of the Related Art Conventionally, a heat absorbing chamber having a sprinkling shower disposed in an upper stage and a combustion chamber having a water storage tank in a lower stage are provided three-dimensionally, and one end of a burner is seen in the combustion chamber. The interior of the partition laid over the heat absorbing chamber is hollow and the whole is made substantially flat elliptical sphere. The heat-absorbing material in a direct-fired water heater capable of rapidly turning cold water into hot water by direct contact between the burning flame and sprinkled cold water is disclosed in
No. 34349 is known.

[0003] In the same manner, in a heat absorbing material of a direct fire type water heater, a large number of heat absorbing materials are provided on the peripheral surface of a hollow rod along the longitudinal direction of the rod.
A heat absorbing material provided with stagnant irregularities is also disclosed in Japanese Utility Model Application No. 50-1591.
No. (Japanese Utility Model Application Laid-Open No. 51-82044), which is known prior to the present application.

[0004]

The problem to be solved by the present invention
In the heat absorbing material of this type described in Japanese Patent No. 34349, the entire shape of the heat absorbing material has a substantially flat elliptical spherical shape. In addition to the benefits of
It also had the advantage that the body was hollow and light in weight.
However, the main body has a manufacturing process of processing the inside into a hollow shape.
The necessary small holes are opened, and in actual use,
When the heat absorbing material is filled on the partition laid in the heat absorbing chamber,
The filling direction of each heat absorbing material varies, and when the small holes of the heat absorbing material are filled, for example, in an upward or obliquely upward direction, a part of the water sprinkled becomes a pot-shaped hollow from the small holes during its flow. Although it may flow into the interior, the heat of the combustion flame
It could not be distributed inside the heat absorbing material. this
Therefore, the heat exchange between water and the heat absorbing material is exclusively performed on the outer peripheral
Was done in In addition, a large number of
Projection is thicker than other parts
However, thermal expansion and contraction of the heat-absorbing material
There has been a problem that distortion occurs and breaks.

On the other hand, Japanese Utility Model Application No. 50-1591 (Japanese Utility Model Application Publication No.
The heat absorbing material described in the microfilm of No. 1-82044) has a configuration in which a large number of recessed and protruding portions are provided on the peripheral surface of a hollow rod along the longitudinal direction of the rod.
In terms of manufacturing, it has the advantage that it can be easily mass-produced by simple extrusion molding operation and can be provided at low cost, but when it is stored in a direct fired water heater, the rod-shaped heat absorbing material is arranged horizontally. alternately must be stacked, not only in the large-scale direct-fired water heater to accommodate a large amount of endothermic material is difficult to align the stack operation, a stream of water, half of the irregularities on the endothermic material
Only in the lower half of the
Does not run, and the area of contact with water is limited.
I did In addition, only a straight through hole was formed in the center of the rod, and although water did not remain in the hollow interior, it did not absorb water.
Combustion hot air is introduced into the hollow part of the heat material to positively absorb heat
Of improving the configuration it did not include any.

According to the present invention, even when a large number of heat exchangers are filled in a heat exchange chamber in a random manner without being horizontally stacked and stacked, the combustion hot air is supplied to the inside of each heat exchanger .
Actively circulate into the heat exchange cavity and heat exchange
The combustion hot air that has flowed into the cavities flows through the internal cavities while twisting and twisting, thereby absorbing heat from the inside of the heat exchanger.
And to provide a heat exchanger in a direct-fired water heater that can convert a large amount of water into high-temperature water even with a small amount of heat exchanger.

[0007]

Means for Solving the Problems In order to achieve the above object, a heat exchanger in a direct-fired water heater according to the present invention comprises a heat exchange chamber in which a water sprinkler is provided in an upper stage of a water heater main body, and a heat exchanger in a lower stage. A combustion chamber is disposed, and a large number of chevron projections are provided on the surface of the heat exchange chamber.
A plurality of substantially horizontally spherical heat exchangers having the following , the heat exchanger has a substantially uniform thickness over the entire body.
Formed inside, a roughly oblong spherical heat with many chevron cavities
Forming an exchange cavity, on both sides of said cavity communicating with said cavity
A pair of hot air circulation ports are opened .

[0008]

[Action] Many heat exchangers of the pair of hot air flow port upward direction, obliquely upward direction or horizontal direction other was filled into a top up form to the heat exchange chamber to the original arbitrary state, start the burner, the if ejection of combustion flame in the combustion chamber, the combustion flame is flame boss towards the heat exchange chamber while heating the reservoir around, between each of the heat exchanger of the gap portion and each of the heat exchangers
The air passes through the internal heat exchange cavity through the hot air circulation port and is discharged from the exhaust port.

Accordingly, the combustion heat of the burner exhibits a large number filled substantially horizontally spherical, having a large number of chevron surface protrusions
That along the curved surface of the heat exchanger with twists and turns, while circulating increased while heating the outer peripheral surface of the body, it is formed in a shape similar with the body contour, the large near the outer peripheral area of the heat exchanger
The combustion hot air from the burners flowing into the heat exchange cavities having a large heat absorption area from the respective hot air flow passages is twisted along the inner peripheral surface of the heat exchange cavities and the inner peripheral surfaces of the many chevron cavities. Bend
Then, the heat exchanger is heated from the inner peripheral surface, circulates while absorbing heat, exhausts from each hot air circulation port, and rises substantially uniformly.
Heats the entire heat exchanger with a large thickness from inside and outside to achieve a substantially uniform temperature
High temperature condition under the temperature distribution .

On the other hand, if water is sprayed from the sprinkler at the same time as the start of the burner, the water can be generated not only on the outer peripheral surface of the heat exchanger having a large number of chevron-shaped protrusions heated to a considerable temperature, but also on the heat.
Heat is exchanged by the heat exchange effect of the heat exchanger itself during the process of twisting and bending along the inner peripheral surface of the heat exchange cavity, which has formed a large number of chevron cavities through the air circulation port , and further burned
In the process of falling down the chamber, it is reheated by being in direct contact with the burning hot air that burns, is quickly stored in a hot water storage tank while becoming hot water, and is then supplied to an arbitrary location via a tapping pipe.

Therefore, in the hot water supply operation, a pair of
The combustion hot air that has entered the heat exchange cavity from the hot air circulation port actively heats the heat exchange body from the inside while twisting and bending along the corners of the inner peripheral surface of many internal chevron cavities. , Sucking
After heating, it is discharged from one of the hot air circulation ports sequentially, so even a small amount of heat exchanger can be used with a sufficiently wide heat exchange
Large area of water that is continuously stable.
It can be a high-temperature hot water Te.

[0012]

An embodiment will be described with reference to the drawings.

In FIG. 1 to FIG. 6, reference numeral 1 denotes a main body of a direct-fired water heater having a three-dimensional shape having a circular, square or polygonal cross section.
Is arranged in a three-dimensional manner, and a combustion chamber 4 provided with a water storage tank 5 having an open upper end is provided in the lower part thereof. The burner 6 that generates the gas is disposed, and the tip side of the burner 6 is viewed into the combustion chamber 4.

Reference numeral 7 denotes a cage-shaped partition for accommodating a heat exchanger 8 which is detachably mounted on the open upper end of the water storage tank 5. The heat exchanger 8 is made of a corrosion-resistant and heat-resistant heat absorbing material. A substantially uniform thickness of the entire main body 8a made of a material such as ceramic.
To form a substantially horizontally long spherical shape, and the curved surface of the main body 8a
By protruding a large number of chevron projections 11 on the surface of the shape, the external shape of a large number of chevron cavities 9a and the body 8a
It has a similar shape and has a large heat absorption area close to the outer shape of the main body 8a.
The heat exchange cavities 9 are formed, and a pair of relatively large-diameter hot air (e.g., the combustion heat of the burner 6) flows into and out of the internal heat exchange cavities 9 on the left and right sides of the main body 8a.
The hot air circulation ports 10, 10 are respectively opened .

Therefore, in the heat exchange chamber 2, the heat exchange body 8 has a pair of hot air circulation ports 10, 10 in an upward direction,
Regardless of the obliquely upward direction, the horizontal direction , or any other direction, even if a large number of cells are stowed in a random manner, the combustion chamber 4
The rising hot air rises along the outer surface of the heat exchanger 8.
Not only heats the heat exchanger 8 from the outside while
Through the opening 10, the inner peripheral surface of the heat exchange cavity 9 and a number of mountains
Heat while flowing while twisting and twisting the inner peripheral surface of the shaped cavity 9a
It is possible to heat the exchanger 8 rapidly from the inner surface to absorb heat.
it can. The heat exchanger 8 is relatively thin as a whole,
Endothermic because it has an almost horizontally spherical shape with a uniform thickness
The heat exchanger 8 has a substantially uniform heat absorbing state without temperature unevenness as a whole.
The heat resistance and durability were also remarkably excellent. This
As a result, a very high heat exchange efficiency with the flowing water can be stably obtained. After the hot water supply operation is stopped, even if water remains in the chevron cavity 9a, it evaporates in a very short time due to the residual heat of the heat exchanger 8 and the ventilation effect flowing through the hot air circulation ports 10 and 10 for a long time. Will not remain.

Reference numeral 12 denotes a funnel-shaped hot water storage tank disposed at a lower portion of the combustion chamber 4 and having an open upper surface. A tapping pipe 13 is connected to a lower end of the hot water storage tank 12. 14 is the main body 1
It is an exhaust port provided in the upper part of.

[0017]

Since the present invention is configured as described above, the following effects can be obtained.

[0018] The heat exchanger, the hot air flow port upward direction, obliquely upward direction or horizontal direction other, even if many messy and would either direction was allowed filling the top up form to the heat exchange chamber, the flame Combustion hot air, not only the outer peripheral surface having a number of mountain-shaped projections protruding on the surface of the heat exchanger, but also the heat exchanger inside through a relatively large-diameter hot air flow port
After you outline and a shape similar was allowed distribution and twists and turns along the corners of the inner peripheral surface of the heat exchanger cavity and a number of chevron cavity having a broad endotherm area, it was drained from the hot air flow port, the heat exchanger the whole is heated to a high temperature actively and efficiently than both sides of the inner and outer surfaces, fool can allowed to endothermic Rika, water that has been sprayed during the hot water supply operation, the heat exchanger having a plurality of chevron protrusion
Internal heat through the curved outer peripheral surface of the
While quickly exchanging heat with the combustion hot air while flowing through the exchange cavity, it flows out from the hot air circulation port and smoothly flows down to the heat exchanger below, aiming for a remarkable expansion of the direct contact area between water and combustion hot air. , a large amount of water greatly promote the heat exchange efficiency
High-temperature hot water can be continuously and stably obtained. The heat exchanger is from where has a substantially uniform wall thickness substantially horizontally ball-shaped over the entire strength is high heat, excellent durability, is suitable as a heat exchanger.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a direct-fired water heater with a part cut away.

FIG. 2 is an enlarged front view of the heat exchanger.

FIG. 3 is an enlarged plan view of a heat exchanger.

FIG. 4 is an enlarged side view of the heat exchanger.

FIG. 5 is a sectional view taken in the direction of the arrows in FIG. 3A-A.

FIG. 6 is a cross-sectional view taken along a line BB in FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main body of direct-fired water heater 2 Heat exchange chamber 3 Sprinkler 4 Combustion chamber 5 Water storage tank 6 Burner 8 Heat exchanger 8a Main body 9 Heat exchange cavity 9a Angle- shaped cavity 10, 10 Hot air circulation port 11 Projection 12 Hot water tank 13 Hot water pipe 14 Exhaust port

Claims (1)

(57) [Claims] 1. A heat exchange chamber in which a water sprinkler is arranged in an upper stage of a water heater main body, and a combustion chamber is arranged in a lower stage.
In a heat exchanger filled with a large number of substantially oblong spherical heat exchangers having a large number of chevron projections on the surface, the heat exchanger has a substantially uniform thickness over the entire main body , and has a large number of chevron cavities inside.
Forming a substantially horizontally elongated heat exchange cavity having
A heat exchanger in a direct-fired water heater, characterized in that a pair of hot air flow ports communicating with the cavity is opened on the side .