JP3099130B2 - 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 promotes heat exchange by making cold water sprinkled in a heat absorbing chamber and burning hot air rising toward the heat absorbing chamber come into direct contact with each other inside a heat exchange porous body in order to promote heat exchange and instantly cool water. The present invention relates to a direct-fired water heater that can be used as high-temperature hot water, promote smooth rise of hot air, and further improve heat exchange efficiency.

[0002]

2. Description of the Related Art Conventionally, a heat absorbing chamber provided with a sprinkler shower is provided in an upper stage of a main body, and a combustion chamber having a hot water storage tank is provided in a lower stage, and one end of a burner is looked into the combustion chamber. A water supply pipe having a distal end connected to a sprinkler shower is positioned adjacent to the water supply pipe over a plurality of stages, and a heat exchange porous body is sandwiched between upper and lower positions of the water supply pipe so as to sandwich the water supply pipe from above and below, A moisture absorbing porous body is disposed in the heat absorbing chamber above the water spray shower, and hot water, which has been heated to a certain degree from the start of the hot water work, is sprayed on the heat exchanging porous body, so that the inside of the heat exchanging porous body is formed. The efficiency of direct heat exchange with the burning hot air is remarkably promoted, so that hot water with a higher temperature can be obtained instantaneously, and the steam generated by the direct heat exchange action with the burning hot air is properly absorbed and removed as a liquid. ,
Prior to the present application, a direct-fired water heater in which steam is prevented from being directly exhausted to the outside of the water heater is disclosed in, for example, JP-A-62-1965.
No. 50 is publicly known.

[0003]

By the way, in the conventional direct-fired water heater of this type, the size of the vent holes provided in each of the plurality of heat exchange porous bodies provided in the heat absorption chamber is as follows.
Perhaps it is finely formed, the size of the vent is almost constant everywhere, so to promote heat exchange efficiency
Provide an appropriate space between each heat exchange porous body
Te be disposed in the endothermic chamber, the sparged cold water towards the heat exchanger porous body from above, slowly allowed flowing down the heat exchanger Porous
After that, onto the heat exchange porous body arranged in the space below
It is necessary to adopt a configuration in which the liquid is dropped sequentially, resulting in endothermic
The room volume could not be reduced. On the other hand, if the ventilation holes are simply made large in order to smooth the flow of the burning hot air, the rising hot air flows through and is discharged as it is before the heat exchange action inside the heat exchange porous body is sufficiently performed. In addition, there is a problem that the heat exchange efficiency is significantly reduced.

[0004] The present invention relates to a direct-fired water heater which further improves the efficiency of heat exchange between cold water and rising combustion hot air, even if the heat absorption chamber is significantly reduced. This is what we tried to provide.

[0005]

In order to achieve the above object, in the direct fire water heater according to the present invention, a heat absorbing chamber in which a water sprayer is disposed in an upper stage of a main body and a combustion chamber is disposed in a lower stage. Wherein a flat heat exchange porous body is provided in the heat absorbing chamber.
Weights are stacked in multiple stages without any gaps between them.
While set, vent the heat exchanger porous compound wherein said heavy set is obtained by sequentially increased in the toward the lower stage than <br/> on stage.

[0006]

In FIG. 1, if the combustion hot air is blown in the combustion chamber, the combustion hot air is blown toward the heat absorption chamber above the combustion chamber. Incidentally, the endothermic chamber was increased sequentially vents towards the lower stage from the upper stage <br/> flat
I that Jo heat exchanger porous body spaced between each
Since a plurality Dankasane set to Ku top up shape, the combustion hot air respectively to the heat exchanger porous body without circulation is inhibited while gradually dropping lifting speed according rises above stage smaller Bottom ventilation resistance It is blown up smoothly while twisting and bending along the numerous vents provided, and heats the entire surface of the multi-stage heat exchange porous body.

[0007] Many During this state, if spraying cold water through the sprinkler on the heat exchanger porous body disposed in the uppermost stage, the cold water respectively provided to the heat exchanger porous lowermost than uppermost It flows down while twisting and twisting along the ventilation hole of. As a result, the cold water to smoothly <br/> falling gaining successively falling speed according to flow down to the lower stage with twists and turns along the large number of vent holes of the heat exchanger porous body obtained by sequentially increases toward the lower stage from the upper stage Combustion hot air that burns while twisting and bending along many air holes is directly contacted without interruption and heat is exchanged efficiently, instantaneously becomes hot water and flows down into the combustion chamber below the heat absorption chamber, the main body It is discharged outside.

It is to be noted that an arbitrary number of heat exchange porous bodies can be further increased.
By arranging them stepwise, the volume of the heat exchange porous body can be easily increased, and the heat exchange capacity can be increased.

[0009]

An embodiment will be described with reference to the drawings. FIG. 1 is a vertical sectional front view of the direct-fired water heater of the first embodiment,
Reference numeral 1 denotes a main body of a water heater having an arbitrary cross-sectional shape such as a rectangle, a rectangle, a cylinder, a square or a polygon, and a heat absorption chamber 2 provided with a sprinkling shower 3 is provided at an upper stage of the water heater. At the same time, a combustion chamber 4 having a water tank 5 around the lower part of the main body 1 is provided. The heat-absorbing chamber 2 is provided with an interval between each of the plurality of stages so that the plate-shaped heat exchange porous bodies 6a, 6b, 6c can be easily taken out.
It is nested and stored.

The heat exchange porous body 6 has a large surface area, and has a mesh structure to increase the contact area. For example, a ceramic material obtained by coating and firing a ceramic raw material with Everlite Scott (trade name) as a base material is used. A porous body, an aluminum foamed porous body, a stainless steel foamed porous body, or the like is used.

Accordingly, by the structure described above, each of the heat exchanger porous body 6a, 6b, a large vent hole 7 of the perforation rate is 6c is automatically formed in a large number, the vent hole 7 is in the uppermost stage heat exchange of the lowermost stage from the heat heat exchanger porous body 6c
It is formed so as to gradually increase toward the porous body 6a .

Numeral 8 denotes a moisture absorbing porous body formed under substantially the same configuration as the heat exchange porous body 6. The moisture absorbing porous body 8 is placed in the heat absorbing chamber 2 above the water spray shower 3. A large amount of steam generated by a direct heat exchange action between the cold water flowing down through the ventilation holes 7 of the heat exchange porous body 6 and the burning hot air, which is disposed so as to block the chamber 2, has a low temperature. The steam is condensed and liquefied while flowing through the porous material 8,
This causes water droplets to drop onto the heat exchange porous body 6 and prevents steam from being directly exhausted to the outside through the exhaust window 9 together with the exhausted hot air. Reference numeral 10 denotes a suction and exhaust device mounted on the exhaust window 9. Reference numeral 11 denotes a hot air inlet opening to the combustion chamber 2, and a burner 12 is housed in the hot air inlet 11. Therefore, the combustion hot air obtained by the burner 12 is blown toward the heat exchange porous body 6.

When the burner 12 is not used, separate hot air is introduced from the hot air inlet 11 into the combustion chamber 2. 1
Reference numeral 3 denotes a funnel-shaped saucer provided at the bottom of the combustion chamber 4. The funnel-shaped saucer 13 has a hot water supply port 14 opened.
Reference numeral 15 denotes a hot air passage for communicating the heat absorbing chamber 2 and the combustion chamber 4.

[0014] In this embodiment the three heat exchanger porous body 6
Although a, 6b and 6c are shown in the figure, two or four or any other number is possible. In addition, the heat exchange capacity can be easily increased by increasing the number of heat exchange porous bodies.

[0015]

Since the present invention is configured as described above, it has the following effects.

In the heat absorbing chamber, a space is provided between each of the heat absorbing chambers.
A flat heat exchanger porous body provided with vent heavy setting the plurality of stages since the successively larger <br/> toward the bottom stage from the top stage without placing a septum, greatly reduce the volume of endothermic chamber With
Is it possible to reduce the size of the device?
Ascending hot air smoothly rises while gradually decreasing the rising speed
Upper together, sparged cold water heat exchanger in the allowed to
Slowly flows with increasing speed as it flows down from
To improve the heat exchange efficiency between cold water and rising hot air.
Besides it is possible that the plate-shaped heat exchanger porous body further above
By increasing the volume, the volume of the heat exchange porous body can be easily increased to increase the heat exchange capacity.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a direct-fired water heater according to the present invention.

FIG. 2 is a plan view of a heat exchange porous body .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main body 2 Heat absorption chamber 3 Sprinkler shower 4 Combustion chamber 6 Heat exchange porous body 6a, 6b, 6c Plural stages of heat exchange porous body 7 Vent hole

Claims (1)

(57) [Claims] 1. A heat absorbing chamber in which a water sprinkler is disposed in an upper stage of a main body and a combustion chamber is disposed in a lower stage, wherein a flat heat exchange porous body is provided in the heat absorbing chamber with an interval therebetween.
Without stacking multiple layers
Direct-fired water heater vent heavy setting the heat exchanger porous body, characterized in that successively increased in the toward the lower stage from the top stage.