JPS62196548A - Direct fire type water heater - Google Patents

Abstract

PURPOSE:To change cool water into high-temperature hot-water quickly and improve heat exchanging efficiency by a method wherein the heat exchanging porous body of a water feeder is bored with a multitude of water feeding holes feeding water to the porous body. CONSTITUTION:When a burner 104 and an exhaust gas inducing unit 115 are operated, combustion gas is induced into a combustion chamber 107 to heat a water feeder 105 and change cool water, accommodated in the water feeder, into hot-water during flowing through a heat exchanging porous body 106 having a high porosity, toward an exhaust passageway 108. Then, the hot-water is supplied from the multitude of water feeding holes 110 onto the cylindrical heat exchanging porous body 106 whereby the hot-water is contacted directly with combustion gas during flowing down slowly along the porous surface of the heat exchanging porous body 106 and becomes high-temperature hot-water, thereafter, is reserved in a hot-water reserving tank 112.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention maximizes the heat exchange area between cold water and hot combustion air to quickly convert a large volume of cold water into high-temperature hot water even with a small water heater. As a result of the direct heat exchange between cold water and hot combustion air, the steam generated by the direct heat exchange action can be properly absorbed, liquefied and removed, and the steam can be prevented from being directly exhausted outside the TM water dispenser. Regarding direct-fired water heaters.

PRIOR ART Conventionally, Japanese Utility Model Publication No. 57-28036 discloses a direct-fired water heater that can quickly turn cold water into hot water by bringing the hot combustion air from the field soil into direct contact with flowing cold water. As shown in FIG. 8, the configuration is such that an endothermic chamber 2 with a sprinkler shower 3 is provided in the upper part of the water heater main body 1, and a water storage tank is installed in the lower part of the water heater main body 1. 5, the combustion chamber 4 is three-dimensionally provided, and the combustion chamber 4 is
One end of the burner 6 can be seen inside. In the heat absorption chamber 2, there are partitions 7...
At the same time, on the partition T, a heat-absorbing material 8 made of a heat-resistant and corrosion-resistant material is formed into a spongy shape so that the entire body is highly flame permeable. Water heater body 1
The heat-absorbing material 8 is placed one after another so that the periphery of the heat-absorbing material 8 is in close contact with the inner wall of the heat-absorbing material 8. The cold water is brought into contact with the hot water to quickly turn it into hot water, and then the hot water is stored in a lower hot water storage tank 9 and then supplied to an appropriate location via a hot water supply pipe 10.

Problems to be Solved by the Invention Incidentally, in the above-mentioned known direct-fired water heater, heat-exchanging heat-absorbing materials are arranged in multiple stages above the combustion chamber to raise the combustion hot air generated in the combustion chamber. Since the cold water is made into high-temperature hot water through the heat exchange effect of direct contact with the cold water flowing down through the heat absorbing material, all heat exchange between the cold water and the hot combustion air takes place only in the upper part of the combustion chamber. However, the heat exchange area is limited by the size of the water heater and cannot be increased.

If the number of stages of the heat absorbing material is increased in order to expand the heat exchange area, the combustion hot air will build up back pressure on itself, making it impossible to maintain a good combustion state. As a result, the heat exchange rate is drastically reduced and hot water cannot be continuously obtained. Furthermore, since conventionally known direct-fired water heaters attempt to obtain hot water through direct heat exchange, a large amount of steam is generated during heat exchange, and this is one of the causes of steam! However, since the steam was exhausted directly to the outside from the exhaust pipe, there was a drawback that the steam condensed and liquefied water droplets dripped from the end of the exhaust pipe as a drain, impairing the durability of the water heater.

Means for Solving the Problems The present invention solves the above-mentioned problems, and its structure will be explained below with reference to FIGS. 1 to 7 corresponding to embodiments. That is, in the first invention, the water heater main body 1
At the bottom of 01 is a combustion port 10 through which the tip of the burner 104 can be seen.
2 and a hot water receptacle 103 formed entirely into a funnel shape, and a water supply device 105 containing cold water is disposed at an upper position within the water heater main body 101.

A heat exchange porous body 106 having a hollow cylindrical shape with a large porosity and having a combustion chamber 107 formed inside is arranged between the hot water receiver 103 and the water supply device 105 to expand the heat exchange area. At the same time, the combustion hot air generated in the combustion chamber 107 is made to flow smoothly without being subjected to back pressure.

The circumferential surface side of the water heater main body 101 and the heat exchange porous body 106
and an exhaust window 109 between the outer peripheral surface side of the water supply device 105 and
An exhaust passage 108 is formed leading to the heat exchange porous body 106, and a large number of water supply holes 1)0 are bored in the water supply device 105 located on the heat exchange porous body 106. Also, in the second invention,
The exhaust window 109 is provided with the above structure, and the moisture absorbing porous body 1) 1 is disposed in the exhaust passage 108 at a position near the exhaust window 108 so as to block the exhaust passage 108, and the exhaust window 109 is disposed along the exhaust passage 108.
The steam that was about to be exhausted to the outside absorbs moisture and condenses.
It is formed to prevent liquefied water droplets from dripping to the outside from the exhaust window 109.

In the first invention, when hot combustion air is sent into the combustion chamber 107 from the combustion port 102, the water supply device 105 is heated by the hot combustion air, and the stored cold water is turned into hot water, and the hot combustion air is transferred to the exchanger. The exhaust passage 108 flows through the heat exchange porous body 106, which has a large area and a large porosity, and effectively heats the heat exchange porous body 106. Numerous water supply holes in next i 1) 0
Hot water whose temperature has been raised to a certain extent is supplied onto the heat exchange porous body 106.

If you do so, hot water will flow through the heat exchange porous body 106 with a large heat exchange area.
While slowly flowing down along the porous surface of the heat exchange porous body 106, it comes into direct contact without interruption with the combustion hot air flowing through the heat exchange porous body 106, thereby efficiently exchanging heat. As a result, the hot water becomes high-temperature hot water from the upper end to the lower end of the heat exchange porous body 106, is collected in the hot water receiver 103, and then is supplied to an appropriate location.

During the continuation of the hot water work, the water supply device 10
5 continues to be heated by the hot combustion air, the temperature of the cold water becomes higher and higher, and the temperature of the hot water sprayed onto the heat exchange porous body 106 also rises, so that hot water of high temperature is continuously obtained. Further, the heat exhaust paper whose temperature has been lowered by the efficient heat exchange action with the hot water is exhausted to the outside of the water heater main body 101 through the exhaust window 109 through the exhaust passage 108 together with the steam generated during the heat exchange action.

In addition, in the second invention, a large amount of steam generated in the exhaust passage 108 by the above-mentioned heat exchange action, together with the heat exhaust paper whose temperature has been lowered by the direct heat exchange action, is released from the exhaust window 109 along the exhaust passage 10B. A moisture-absorbing porous body with a high porosity, which is arranged in the exhaust passage 108 near the exhaust window 109 so as to block the exhaust passage 108, so that heat exhaust paper that contains a lot of steam when it is about to be exhausted directly outside the device 1) While flowing through 1, moisture is absorbed, steam is condensed and liquefied, and the generated water droplets are dripped onto the upper end side of the heat exchange porous body 106 along the water supply device 103 to raise the temperature.

Therefore, the steam contained in the exhaust heat is removed from the exhaust passage 10B.
Since the moisture-absorbing porous body 1) 1 provided therein reliably liquefies and removes steam, it is possible to prevent a large amount of steam from being discharged from the water heater main body 101 to the outside.

Embodiments Below, embodiments of the direct-fired water heater according to the present invention will be described.

In FIGS. 1 to 4, 101 has a rectangular cross-sectional shape, a rectangular shape, a cylindrical shape, a square shape, a polygonal shape, etc. 103 is disposed. A water supply device 105 containing cold water is disposed at the upper part of the water heater main body 101. 106
is a heat exchange porous body that has a large surface area and has a three-dimensional network structure that increases the catalytic reaction rate, and the heat exchange porous body 106
For example, a ceramic porous body made of Everlite Scotto (trade name) as a base material coated with ceramic raw materials and fired, or aluminum foam made by pouring molten aluminum or molten stainless steel into a polyurethane sponge and molding it with special chemicals. A porous body or a stainless steel foam porous body can be considered.

The heat exchange porous body 106 is formed into a cylindrical shape with both upper and lower ends open, with a combustion chamber 107 inside, and is disposed between the heat exchange porous body 106ti, the hot water receiver 103, and the water supply device 105. has been done.

An exhaust passage 1 having an appropriate width is provided between the circumferential surface side of the water heater main body 1 and the outer circumferential surface side of the heat exchange porous body 106 and the water supply device 105.
08 is provided, and the exhaust side of the exhaust passage 108 is connected to an exhaust window 109 opened in the top plate of the water heater main body 101.

1) 0Fi A large number of water supply holes are drilled at the bottom of the water supply device 105 to supply cold water to the upper end of the cylindrical heat exchange porous body 106. 1)1 A moisture absorbing porous body with a high porosity is disposed in the exhaust passage 108 in the vicinity of the ill exhaust window 109 so as to block the exhaust passage 108, and the moisture absorbing porous body 1)1 is a heat exchanger. A large amount of steam generated by the direct heat exchange action between the cold water flowing down in the porous body 106 and the hot combustion air flowing in the lateral direction flows through the moisture-absorbing porous body 1) together with the low-temperature heat exhaust paper. The water condenses and liquefies, causing water droplets to flow along the circumferential surface of the water supply device 105 and passing through the heat exchange porous body 106.
It has the role of preventing the steam from dripping upward and being directly exhausted to the outside through the exhaust window 109 together with the heat exhaust paper. The structure of the above moisture absorbing porous body 1) 1H is a heat exchange porous body 1
If it is made the same as 06, the effect can be further enhanced.

1) 2 is a hot water storage tank formed between the lower circumferential surface of the water heater main body 1 and the outer peripheral surface of the hot water receiver 103, and the hot water storage tank 1)
2 is attached to the base end side of the hot water supply pipe 1) 3. H4F
1 is a water supply pipe whose tip end side is inserted into the water supply device 105; 1) 5 is a suction/exhaust device connected to the exhaust window 109;

Therefore, in the direct-fired water heater of the above embodiment, when the burner 104 and the suction/exhaust device 1) 5 are operated, the combustion hot air is introduced into the combustion chamber 107, heats the water supply device 105, and accommodates the The cooled water is turned into hot water, and the heat exchange porous body 106 with a high perforation rate is heated while flowing toward the exhaust passage 108. Therefore, there are many water supply holes 1) 0...
When hot water is supplied onto the cylindrical heat exchange porous body 106, the hot water slowly flows down along the porous surface of the heat exchange porous body 106. Effective heat exchange occurs through direct contact with hot air, resulting in high-temperature hot water that is stored in the hot water storage tank 1). On the other hand, a large amount of steam generated by the direct heat exchange action is passed along with the low-temperature exhaust heat through the exhaust passage 108 toward the exhaust window 109 by the suction action of the suction/exhaust device 1)5. However, since the moisture-absorbing porous body 1) 1 is disposed in the exhaust passage 108 near the exhaust window 109, the low-temperature exhaust combustion heat containing a large amount of steam passes through the moisture-absorbing porous body 1) 1. While chewing, the steam condenses and becomes liquefied, forming water droplets that drip along the water supply device 105. Therefore, even if the hot water work described above is continued for a long time,
Steam is prevented from flowing outside the water heater main body 101, and good water heating operation can be continued for a long period of time.

In the direct-fire type embodiment shown in FIGS. 5 to 7, the combustion port 101 is opened at the lower side of the water heater body 101, and a horizontal burner 104' is disposed in the combustion port 10). The hot water receptacle 103' is formed entirely into a funnel shape with an open upper surface, and the inside thereof is formed into a hot water storage chamber 1)2'.

On the peripheral wall of the funnel-shaped hot water receiver 103',
Drill an appropriate number of droplets 1) 6......
A part of the high temperature hot water that has been heat exchanged by the heat exchange porous body 106 passes through the hot water outlet 1) 6, and then reaches the hot water receiver 103.
'The temperature of the fallen person is removed in the hot water storage chamber 1)2', and the hot water receiver 103
The configuration is the same as that of the first embodiment except that hot water is supplied to an appropriate location from a hot water supply pipe 1) 3' connected to the bottom of the body.

Effects of the Invention In short, since the present invention has the technical means described above, the heat exchange porous body 106 with a large porosity is formed into a hollow cylindrical shape to significantly expand the heat exchange area and to directly connect combustion hot air and cold water. The contact time is made as long as possible to quickly turn a large volume of cold water into high-temperature hot water and the person falls into the hot water receivers 103 and 103'. Since no back pressure is applied to the hot combustion air, efficient hot water work can be carried out over a long period of time, and since the water supply device 105 is intensely heated by the hot combustion air from the field soil, water is supplied to the heat exchange porous body 106. When it is heated, it becomes hot water and water, which further promotes heat exchange efficiency and instantly obtains high-temperature hot water.
The exhaust window 109 allows the steam generated by the heat exchange action with the water heater 106 to be exhausted together with the low-temperature exhaust hot air through the exhaust passage 108 to the outside of the water heater main body 101 through the exhaust window 109.
Moisture-absorbing porous body arranged in the exhaust passage 108A in the vicinity 1)
1, it can be condensed and liquefied and reduced on the heat exchange porous body 106. As a result, corrosion caused by water droplets dripping outside from the exhaust window 109 is eliminated, and the life of the direct-fired water heater is extended. Achieve the desired effect.

[Brief explanation of drawings]

The drawings show an embodiment of the direct-fired water heater according to the present invention, in which FIG. 1 is a front view with main parts cut away, and FIG.
Figure 1Z-3 is a cross-sectional view taken in the direction of arrows B-B in Figure 1, Figure 4 is a partially cutaway front view of the heat exchange porous body, Figures 5 to 7
The figures show the direct-fired water heater on the other side, and Fig. 5 is a front view with main parts cut away, Fig. 6 is a vertical side view taken in the direction of arrow C-C in Fig. The figures are a cross-sectional plan view taken along the line D--D in FIG. 5, and FIG. 8 is a vertical cross-sectional front view with a portion of the conventional example cut away.

Claims (2)

[Claims] (1) A water supply device is arranged in the upper part of the main body of the water heater, which has a combustion port and a hot water receiver at the bottom, and a hollow cylindrical shape with a combustion chamber inside is arranged between the hot water receiver and the water supply device. A heat exchange porous body is disposed, and an exhaust passage leading to an exhaust window is formed between the circumferential surface side of the water heater main body and the heat exchange porous body and the outer circumferential surface side of the water supply device. A direct-fired water heater characterized by having a large number of water supply holes drilled on a heat exchange porous body to supply water. (2) A water supply device is arranged at the top of the main body of the water heater, which has a combustion port and a hot water receiver at the bottom, and a hollow cylindrical tube with a combustion chamber inside is placed between the hot water receiver and the water supply device. A heat exchanger is installed,
forming an exhaust passage leading to an exhaust window between the circumferential side of the water heater main body and the outer circumferential side of the heat exchange porous body and the water supply device;
The water supply device has a large number of water supply holes drilled on the heat exchange porous body to supply water, and a moisture absorbing porous body is arranged in the exhaust passage near the exhaust window so as to block the exhaust passage. Fire type water heater.