JPH065136B2 - Pulse combustion type water heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water heater employing a pulse combustion system, and more particularly to improvement of a heating structure for heat exchange water.

[Prior Art] Conventionally, a pulse combustion type water heater is as shown in FIG. That is, 1 is a fan unit, 2 is an air cushion chamber, 3 is a gas regulator, 4 is a gas cushion chamber, 5 is a pulse combustion unit, 6 is a heat exchange chamber, 7 is a tail tube, and 8
Is a water supply pipe, 9 is a discharge pipe, 10 is a muffler pipe, 10a is a heat shield plate, 11 is an exhaust chamber, 12 is an exhaust pipe, and 13 is a drain pipe.

Then, the air cushion chamber 2 and the gas cushion chamber 4
Respectively, temporarily collects combustion air and fuel gas to equalize the pressure, and guides them to the pulse combustion unit 5 to perform pulse combustion. Exhaust gas generated by combustion flows from the tail pipe 7 to the muffler chamber 10
And exhausted from the exhaust pipe 12 through the exhaust chamber 11. In addition, the heat exchange water guided from the water supply pipe 8 to the heat exchange chamber 6 exchanges heat with the exhaust gas in the tail pipe 7 to be converted into hot water, and is supplied from the outlet pipe 9 to a predetermined portion. .

[Problems to be Solved by the Invention] By the way, since the heat exchange chamber 6 stores heat exchange water,
It must be watertight. Furthermore, the heat exchange chamber 6 has a large volume because it houses the pulse combustion unit 5 and the tail pipe 7,
The cost is high because it must be made extremely sturdy to withstand the water pressure. Moreover, since a large amount of heat exchange water is stored, it takes a long time to reach the desired temperature, which is inconvenient.

The present invention has been made in view of the above circumstances, and an object thereof is to enable instantaneous hot water supply by improving heat exchange efficiency for heat exchange water, simplify the configuration, and reduce cost. An object of the present invention is to provide a pulse combustion type hot water supply device.

[Means and Actions for Solving the Problems] The present invention is a double pipe including an inner pipe and an outer pipe provided with a combustion unit and a decoupler in a water heater main body including a casing. The inner pipe communicates with the combustion unit to guide the exhaust gas discharged from the combustion unit, and a double tail pipe for guiding the heat exchange water is housed between the outer pipe and the inner pipe. A pulse combustion type water heater, characterized in that a heat exchange water heating coil communicating with the heat exchange water conducting side of the double tail pipe is housed therein.

By doing so, heat exchange efficiency is improved, hot water can be supplied almost simultaneously with the start of pulse combustion, and a compact structure can be obtained.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 20 denotes a water heater main body composed of a housing, one side portion of which is divided into left and right by a vertical partition plate 21, and an inside of the vertical partition plate 21 is divided into upper and lower parts by a horizontal partition plate 22. Inside the vertical partition plate 21, the lower part of the horizontal partition plate 22 serves as a supply / discharge mechanism chamber 23, and a gas supply pipe 24, a solenoid valve 25, a governor 26, and a gas cushion tank 27 are sequentially connected in series and housed. . In addition, the startup fan 2
8 and the suction muffler 29 are connected in series and accommodated. Furthermore, the exhaust pipe 30, the neutralizer 31, and the discharge muffler 32 are sequentially connected in series and housed. The gas supply pipe 24 projects from the water heater body 20 and communicates with a gas supply source (not shown). The exhaust pipe 30 projects from the water heater body 20 and opens.

On the other hand, inside the vertical partition plate 21, an upper portion of the horizontal partition plate 22 serves as a decoupler 33, and a pulse combustion section 34 is attached to the lower portion of the vertical partition plate 21. This pulse combustion unit 34
Is a part of the premixing chamber 35 that protrudes to the outside of the vertical partition plate 21.
The suction pipe 36 extending from the gas cushion tank 27 and the suction pipe 37 extending from the suction muffler 29 are in communication with each other. A combustion chamber 38 is formed inside the vertical partition plate 21 and is separated from the premix chamber 35 by a filter trap 39. 39a is a spark plug. The combustion chamber 38 of the pulse combustion unit 34 thus configured is surrounded by a water supply cover 40 having a gap. A water supply pipe 41 communicating with a water supply source (not shown) is connected to one end of the water supply cover 40.

A double tail pipe 42 is connected to one end faces of the pulse combustion unit 34 and the water supply cover 40, the inner pipe 42a communicates with the combustion chamber 38, and the space between the inner pipe 42a and the outer pipe 42b is the above. It communicates with the water supply cover 40. The double tail pipe 42 is temporarily extended in the horizontal direction and then bent upward to form the decoupler 33.
Is extended to the top of. The inner pipe 42a at the upper end is opened, and a blind plate 43 closes between the inner pipe 42a and the outer pipe 42b.

In addition, the decoupler 33 includes a coil 44 for heating heat exchange water.
The lower end is communicated with a part of the outer pipe 42b in the vicinity of the blind plate 43 through the conducting pipe 44a. Further, a hot water supply pipe 45 communicating with a hot water supply tap (not shown) is connected to one end of an upper portion of the heating coil 44. In addition, decoupler 3
An exhaust guide pipe 46 that communicates with the discharge muffler 32 is connected to the horizontal partition plate 22 that is the bottom of 3. Decoupler 33
A control circuit 47 is provided outside the vertical partition plate 21, which is a side part of the
Is provided.

Then, as shown by the black arrow in the figure, the premix chamber 3 of the pulse combustion unit 34 is connected from the gas supply pipe 24 through the solenoid valve 25, the governor 26, the gas cushion tank 27 and the suction pipe 36.
Fuel gas is guided to the fuel cell 5, and combustion air is guided to the premixing chamber 35 from the starting fan 28 through the suction muffler 29 and the intake pipe 37 as shown by the white arrow in the figure, and is mixed with each other. These air-fuel mixtures are introduced into the combustion chamber 38 via the filter trap 39 and pulse-combusted. The exhaust gas generated by the combustion is guided into the inner pipe 42a of the double tail pipe 42 and is once discharged to the decoupler 33. In addition,
By providing the decoupler, the introduced exhaust gas becomes like a kind of atmosphere opening, and there is a muffler effect to some extent, and the oscillation frequency of pulse combustion becomes high here, and the muffler 32 is muffled by the exhaust muffler 32 that is introduced later. It will be easier.
Moreover, as described later, the heat exchange area with the heat exchange water becomes large.

That is, at the same time as pulse combustion, heat exchange water is supplied from the water supply pipe 41 as shown by the small arrow in the figure, and the heat of the combustion chamber 38 is absorbed in the water supply cover 40. Further, when conducting conduction between the inner pipe 42a and the outer pipe 42b of the double tail pipe 42, the inner pipe 42a
It absorbs the heat of the exhaust gas inside and converts it into hot water. Furthermore, heat can be absorbed from the exhaust gas in the decoupler 33 via the outer pipe 42b, and the heat of the exhaust gas in the decoupler 33 is continuously absorbed while the hot water is conducted to the conducting pipe 44a and the heating coil 44. Therefore, the heat exchange water becomes hot water having a sufficiently high temperature and is supplied from the hot water supply pipe 45, and the hot water is obtained almost at the same time as the start of pulse combustion.

The cooled exhaust gas of the decoupler 33 is guided to the discharge muffler 32 from the exhaust guide pipe 46, and further discharged from the exhaust pipe 30 to the outside via the neutralizer 31. The drain contained in the exhaust gas is neutralized by the neutralizer 31 and then discharged to the outside.

The heating coil 44 in the above embodiment may be provided with fins to improve the heat exchange efficiency.

[Effects of the Invention] As described above, according to the present invention, the hot water heater main body including the housing is provided with the combustion section and the decoupler, and the inner tube communicates with the double tail tube in the decoupler. And the heat exchange water heating coil that communicates with the heat exchange water conducting side of the double-tailed tube is accommodated, so that the heating for the heat exchange water is complete and the heat exchange efficiency is improved.
Hot water can be supplied almost at the same time as the start of pulse combustion, and it has the function of instantaneous hot water supply, which is convenient.

Further, a particularly large heat insulating structure is not required, which contributes to cost reduction, a compact structure is obtained, and effective use of space is achieved.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a pulse combustion type water heater showing a conventional example of the present invention, and FIG. 2 is a schematic vertical sectional view of a pulse combustion type water heater showing an embodiment of the present invention. 20 ... Water heater main body, 34 ... Pulse combustion part, 33 ... Decoupler, 42 ... Double tail pipe, 42a ... Inner pipe, 42b ... Outer pipe,
44 ... A coil for heating heat exchange water.

Claims (1)

[Claims] 1. A water heater main body comprising a housing, a combustion section and a decoupler, wherein the decoupler is a double tube consisting of an inner tube and an outer tube, wherein the inner tube is the combustion section. A double tail pipe that communicates the exhaust gas discharged from the combustion section and guides the heat exchange water between the outer pipe and the inner pipe is housed, and the heat exchange of the double tail pipe is performed in the decoupler. A pulse combustion type hot water supply device characterized in that a coil for heating heat exchange water communicating with the water conducting side is housed.