JP3069919B2 - 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 bringing cold water sprinkled in a heat absorbing chamber into direct contact with combustion hot air flaming toward the heat absorbing chamber in a heat exchange porous body, thereby promoting heat exchange and instantaneous cooling of the cold water. The present invention relates to a direct-fired water heater that can be used as hot water and can prevent breakage of the heat exchange porous body as much as possible.

[0002]

2. Description of the Related Art Conventionally, a heat absorbing chamber provided with a water spray shower is provided in an upper stage of a water heater 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. In the heat absorbing chamber, a water supply pipe having a tip side connected to a watering shower is wound adjacently over a plurality of stages, and a large number of water supply pipes are sandwiched from above and below the water supply pipe.
A heat-exchange porous body having fine pores and a moisture-absorbing porous body in the heat-absorbing chamber above the sprinkler shower are respectively provided. Spraying on the top significantly enhances the efficiency of direct heat exchange with the combustion hot air performed inside the heat exchange porous body, instantaneously obtains hotter hot water, and is generated by the direct heat exchange action with the combustion hot air. Prior to the present application, a direct-fired water heater that properly absorbs moisture, removes it by liquefaction, and prevents the steam from being exhausted to the outside of the water heater is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-196550. And are known.

[0003]

In the conventional direct-fired water heater of this type, the entire heat exchange porous body disposed in the heat absorbing chamber is formed substantially in the shape of a flat plate, and its peripheral edge is formed as a main body. If the main body receives an impact for any reason, the peripheral edge of the heat exchange porous body may be damaged or cracked due to the impact. However, there is also a disadvantage that the corners of the heat exchange porous body are damaged at the time of attaching or removing the heat exchange porous body.

In addition, when the body undergoes thermal deformation due to excessive heating, an excessive force is applied to the closely-connected heat exchange porous body, and as a result, the heat exchange porous body is not only damaged but also damaged. When the body is broken into two or more parts, there is a problem that the body falls into the combustion chamber from the heat absorption chamber and the hot water work cannot be continued.

According to the present invention, when a heat exchange porous body having a substantially flat plate shape is disposed in a heat absorbing chamber, the peripheral edge of the heat exchange porous body is protected by a protective frame so that the peripheral edge is not loosely damaged. Even if the heat exchange porous body is cracked into two or more parts for any reason, if the split heat exchange porous body falls into the combustion chamber and hot water work is not stopped, At the same time, the heat exchange porous body is formed smaller than the main body, and a heat exchange porous body is formed in the heat absorption chamber in which a gap under which water flows is formed between the peripheral surface of the protective frame and the peripheral surface of the heat absorption chamber wall. Therefore, a direct-fired water heater is provided which aims to positively lower the temperature of the inner wall surface of the main body and prevent the heat exchange porous body from being damaged by distortion caused by thermal deformation of the main body. It is what it was.

[0006]

Means for Solving the Problems In order to achieve the above object, in a direct fired water heater according to the present invention,

[0007] A heat absorbing chamber in which a water sprinkler is arranged in the upper stage of the main body is
In the case where a combustion chamber is provided in a lower stage, a heat exchange porous body whose outer periphery is protected by a protective frame is provided in the heat absorbing chamber.

[0008] The heat exchange porous body is installed in the heat absorption chamber so that a gap for flowing water is formed between the peripheral surface of the inner wall of the heat absorption chamber and the outer peripheral surface of the protective frame.

Further, a plurality of gap holders are provided on the outer periphery of the protective frame to easily form a gap for flowing water.

[0010]

In FIG. 1, when the combustion hot air is raised in the combustion chamber, the combustion hot air is raised toward the upper heat absorption chamber from the combustion chamber, passes through the inside of the heat exchange porous body provided, and heats up. Heat the porous body. During this state, while the water through the sprinkler when the cloth distributed on the heat exchanger porous body, said water sequentially flows down while twists and turns the internal heat exchanger porous body,
Upflow while twists and turns the internal heat exchanger porous than the combustion chamber
It is in direct contact with the hot combustion air that passes through it without interruption and efficiently exchanges heat, instantaneously rises in temperature, becomes hot water and flows down into the combustion chamber below the heat absorption chamber, and the hot and cold water flows down the combustion chamber and While falling, it comes into contact with the hot combustion air, becomes hot water, and is drained out of the main body.

Since the heat exchange porous body is easily installed in the heat absorbing chamber by the support member while the outer periphery is protected by the protective frame, the rostral or porous partition body is different from the conventional apparatus. Since there is no obstruction compared to the one installed above, the combustion hot air passes through the inside of the heat exchange porous body while flowing in contact with the entire lower surface of the heat exchange porous body, so that the heat exchange action with water is further enhanced. Huh brought improved Rika, cracking occurs in the heat exchanger due to rapid temperature changes, the two divided also be prevented that immediately falling heat exchanger porous body, the heat exchange at the time of attachment and detachment of the upper heat exchanger porous body In addition to preventing damage to the peripheral edge of the porous body, damage to the plurality of heat exchange porous bodies during the stacking operation can be prevented, and the weight of the heat exchange section can be extremely reduced. In addition, since a flow-down gap of water is formed between the outer peripheral surface of the protective frame that protects the heat exchange porous body and the wall surface of the heat absorption chamber through the gap holding body, a part of the sprayed water is reduced. It flows down in the flowing gap along the wall surface of the heat absorbing chamber, lowers the temperature of the wall of the heat absorbing chamber, prevents the heat distortion of the whole body from reaching the heat exchange porous body, and damages the heat exchange porous body. Can be prevented as much as possible.

[0012]

An embodiment will be described with reference to the drawings. FIG. 1 is a vertical front view of a direct-fired water heater, and 1 is 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. The upper stage is provided with a heat absorbing chamber 2 in which a water sprinkler 3 is disposed, and the lower stage of the main body 1 is provided with a combustion chamber 4 having a water storage tank 5 in the periphery. Sprinkler 3 is a watering nozzle other than the illustrated example
Anything that can spray water can be used.
Optional. The heat exchange porous body 6 is housed in the heat absorbing chamber 2 so as to be able to be taken out. The heat exchange porous body 6 is formed in a substantially flat plate shape as a whole, and is provided with a large number of continuous ventilation holes 6a on the surface and inside thereof.
The whole skeleton is made of thick aggregate, and relatively large continuous
Providing a large number of ventilation holes increases the geometric surface area.
For example, a polyurethane foam material is used as a substrate and impregnated and fired with a ceramic material .
A ceramic whose skeleton is formed of ceramic
Use a form. Note that ceramic raw materials include
Luminous, cordierite, cordierite and al
Mineral, zirconia, mullite, di
A blend of luconia and mullite, alumina
Silica, silicon carbide, mullite
Compounded with silicon carbide, silicon nitride, other
To increase the surface activity of the Lamic foam,
Activated alumina is coated on the surface of the skeleton,
One coated with silicon carbide to increase thickness
It may be used. Heat exchange recombinants that these ceramic was used as a raw material
Withstands long-term use and excellent oxidation resistance
Have been. In addition to ceramics, stainless steel and nickel
Other metal porous bodies may be used. Reference numeral 7 denotes a protective frame for protecting the peripheral edge of the heat exchange porous body 6, and the protective frame 7 is formed in a U-shaped cross section. Therefore, the heat exchange porous body 6 is housed in the protective frame 7 and is completely protected by covering the peripheral edge with the protective frame 7, and the heat exchange porous body whose peripheral edge is protected by the protective frame 7 is provided. The body 6 is housed and installed in the heat absorbing chamber 2 via an appropriate support member 8. The sectional shape of the protective frame 7 is simply a flat plate.
The present invention is not limited to this embodiment. 9
Is a moisture-absorbing porous body provided with fine ventilation holes throughout ,
The suction wet porous body 9 sprinkler 3 endothermic chamber 2 of the upper position, is disposed to intercept the absorbing heat chamber 2, increasing circulation water flowing down in a continuous vent 6a of the heat exchanger porous body 6 A large amount of steam generated by the direct heat exchange action with the burning hot air is condensed and liquefied while flowing through the moisture absorbing porous body 9 together with the low-temperature exhaust heat, and the water drops are converted into heat exchange porous bodies 6.
By dropping it on the upper side, the steam is prevented from being directly exhausted to the outside through the exhaust window 10 together with the exhausted hot air. Also a sprinkler
Water mist generated when 3 is a watering nozzle type
Water can be removed. 11 is an exhaust window 10
It is a suction and exhaust device attached to. Reference numeral 12 denotes a hot air inlet opening to the combustion chamber 2, and a burner 13 is housed in the hot air inlet 12. Therefore, the combustion hot air obtained by the burner 13 is blown toward the heat exchange porous body 6. When the burner 13 is not used, separate hot air is introduced from the hot air inlet 12 into the combustion chamber 4 . 14
Is a funnel-shaped saucer provided at the bottom of the combustion chamber 4, and the funnel-shaped saucer 14 has a hot water supply port 15 opened. 16
Is a hot air passage for communicating the heat absorption chamber 2 and the combustion chamber 4. Numeral 17 denotes a water flowing gap formed between the outer peripheral surface of the protection frame 7 and the inner wall peripheral surface 2a of the heat absorbing chamber 2. The water flowing gap 17 is, as shown in FIG. It is formed by projecting a large number of punch-type gap holding members 18 with an appropriate gap on the entire outer periphery of the frame 7.

FIG. 4 shows a modified embodiment of the gap holding member 18 shown in FIG. 3, and the gap holding member 18a of this embodiment has uneven portions of the same size. It is composed of a large number of wavy bodies formed in a continuous manner, and by attaching a wavy gap holding body 18a to the outer peripheral surface of the protective frame 7, the water flowing gap 17 is formed.

FIG. 5 shows still another modified embodiment of the gap holding member 18 shown in FIG. 3, in which the gap holding member 18b has a large number of angles. The material is mounted on the entire outer peripheral surface of the protective frame 7 with an appropriate gap. 19 is a handle provided on the upper surface of the protection frame 7. Stacking multiple heat exchange porous bodies 6
The heat exchange pores in the heat absorbing chamber 2 by the handle 19
The attachment / detachment work of the body 6 can be reliably performed.

[0015]

Since the present invention is configured as described above, it has the following effects. Since the heat exchange porous body is installed in the heat absorbing chamber under a state where the outer periphery is protected by the protective frame, as in the conventional device,
Since there are no obstacles compared to those installed on the rostral or porous partition, the combustion hot air can pass through the inside of the heat exchange porous body while contacting the entire lower surface of the heat exchange porous body. Huh can allowed to further improve the heat exchange action between water and combustion hot air Rika, cracking occurs in the heat exchanger porous body by sudden temperature changes, to prevent falling accidents heat exchanger porous body be bisected In addition to being able to continue the hot water work for a long period of time , it is possible to prevent the peripheral edge of the heat exchange porous body from being damaged at the time of attaching and detaching the heat exchange porous body , and also to stack a plurality of heat exchange porous bodies. It is also possible to prevent breakage during stacking work.

In addition, according to the present invention, a large number of gap holders are provided on the outer periphery of the protective frame to form a water flow gap between the outer peripheral surface of the protective frame and the inner peripheral wall of the heat absorbing chamber. A part of the sprayed water flows down along the wall surface of the heat absorption chamber, lowering the temperature of the wall surface of the heat absorption chamber, preventing the heat distortion of the entire body from reaching the heat exchange porous body, and breaking the heat exchange porous body. Can be prevented as much as possible.

[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 an enlarged vertical sectional front view of a direct-fired water heater in which a main part is broken.

FIG. 3 is a perspective view of a heat exchange porous body whose outer periphery is protected by a protection frame.

FIG. 4 is a plan view of a heat exchange porous body showing another example.

FIG. 5 is a plan view of a heat exchange porous body showing another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body of a water heater 2 Heat absorption room 2a Peripheral surface of heat absorption room wall 3 Sprinkler 4 Combustion chamber 6 Heat exchange porous body 7 Protective frame 17 Water flow gap 18, 18a, 18b Gap holder

Claims (3)

(57) [Claims] 1. A heat-exchange chamber in which a water sprinkler is arranged in an upper stage of a main body and a combustion chamber is arranged in a lower stage, wherein a heat-exchange porous body whose outer periphery is protected by a protective frame is arranged in the heat-absorber. A direct-fired water heater characterized by being installed. 2. The heat exchange chamber according to claim 1, wherein the heat exchange porous body is installed in the heat absorption chamber such that a gap for flowing water is formed between the peripheral surface of the inner wall of the heat absorption chamber and the outer peripheral surface of the protection frame. Direct fired water heater. 3. The direct-fired water heater according to claim 1, wherein a plurality of gap holders are provided on an outer periphery of the protection frame.