JP2568965B2 - 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 hot water supply apparatus applied to a water heater, a hot water supply heater and other hot water supply equipment.

[0002]

Conventionally, a heat exchanger having a water flow pipe with fins, the water heater comprising a burner for heating the heat exchanger, the heat for the expansion of the drain prevent white smoke prevention, capacity range It is known to have an air supply device having an air introduction pipe for mixing air into the combustion gas from the burner near the exchanger .

[0003]

However, according to the above-mentioned conventional apparatus, no drain is generated on the fins of the heat exchanger, and the
It is not necessary to mix air near the heat exchanger
However, when the combustion gas is exhausted, white smoke is generated
Combustion that it is desired to mix air into the combustion gas
In this state, open near the exhaust port separately from the air introduction pipe.
A separate air delivery pipe must be provided .

[0004]

SUMMARY OF THE INVENTION The present invention proposes to solve the above-mentioned disadvantages, and comprises a heat exchanger having a finned water pipe, a burner for heating the heat exchanger, and a burner. And an air supply device for mixing air into the combustion gas from the apparatus, wherein the air supply device is provided with a heat exchanger.
A sky with multiple air ejection holes facing the fins
An air inlet pipe and a downstream end of the air inlet pipe
To the exhaust port located downstream of the heat exchanger in the direction of combustion gas flow
An air delivery pipe facing the opening, and the air delivery pipe
And an opening / closing means for opening / closing the air passage .

[0005]

According to the present invention, when the air introducing pipe is closed by the opening / closing means, the air is introduced.
Air supplied to the inlet pipe is blocked by opening and closing means.
As a result, all air is blown out from the air outlet and the heat exchanger
Dilutes the combustion gas around the fins and generates drain on the fins
Prevent or increase the range of capabilities. Also, opening and closing hands
If a step is opened, only a small amount of air will be blown out from the air outlet
Most of the air supplied to the air inlet pipe is connected downstream.
Flows into the air delivery pipe, and the tip of the air delivery pipe is opened.
The temperature of the combustion gas ejected from the mouth and flowing to the exhaust
Prevents the generation of white smoke .

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
You. 1 to 3, reference numeral 1 denotes a combustion case of a water heater.
As shown in FIG.
A heat exchanger 4 having heat absorbing fins 3 of
An all-primary burner 5 to be heated is provided. The burner 5
Means that the mixture of primary air and gas is forced by fan 6
Air was sent. The heat exchanger 4 is close to the burner 5
A primary heat exchanger 4a and a secondary heat exchanger remote from the burner 5.
And a two-stage heat exchanger type consisting of a heat exchanger
The water sent from the primary heat exchanger 4a side in Ip 2
And sent it out. In this case, primary heat exchange
The space between the heat absorbing fins 3a of the heat exchanger 4a is
Thermal fins 3bBetweenSeparationIt is rough. This is mainly
A primary method to suppress the generation of CO due to all primary combustion
In order to reduce the amount of heat absorbed in the heat exchanger 4a,
The method has been taken. Also, the combustion gas is in the upper part of the combustion case 1.
From the exhaust port 1a. 7 in the figure
Is a gas connected to the nozzle 8 facing the suction port 6a of the fan 6.
Shows the supply path of the power supply. 9 is an air supply device of the primary heat exchanger 4a.
It penetrates the heat absorbing fins 3a of the water passage pipe 2a and
Copper air introduction pipe 11 in which air ejection holes 10 are arranged
Equipped, The air sent by the fan 12
Between the primary heat exchanger 4a and the secondary heat exchanger 4b
Air is easily discharged from the air discharge hole 10 of the
Air is mixed into the space 13 around the next heat exchanger 4b. This
At this time, the heat absorbing fins 3a of the primary heat exchanger 4a
Since the intervals are coarse, the air ejection holes 10 can be easily formed.Ma
Further, an air delivery pipe 16 is provided downstream of the air introduction pipe 11.
And connect the tip opening 16a of the air delivery pipe 16 with
To the exhaust port 1a, and further in the middle of the air delivery pipe 16.
Opening and closing means for opening and closing the air passage of the air delivery pipe 16
15 were provided. According to this, the air from the air ejection holes 10
Close the opening / closing means 15 when you need
When not needed, open and close the opening / closing means 15 and mainly exhaust air
1a. That is, when the opening / closing means 15 is closed, the supply
All the air is ejected from the air ejection holes 10 and
Dilutes the combustion gas of the fuel gas and changes the dew point of the combustion gas to secondary heat exchange
Heat can be reduced below the surface temperature of the vessel 4b.
Drain does not occur in the vessel 4. Also, opening and closing means
15 and open the tip opening 1 through the air delivery pipe 16.
When air is sent out from the exhaust port 6a,
Prevents the generation of white smoke by lowering the temperature of exhaust gas
can do. On the other hand, the air introduction pipe 11 is
Heated by the switch, but the opening / closing means 15
Always Air flows through the air introduction pipe 11 and is cooled.
Thus, heating of the air introduction pipe 11 is prevented. Place
In this embodiment, the air introduction pipe 11 is connected to the primary heat exchanger 4.
a through the heat absorbing fin 3a
11 is also cooled by the water in the water pipe 2a.
In the above-described embodiment, the air introduction pipe 11 is connected as shown in FIG.
As shown in FIG.
So that it is located above the space between the water pipes 2a and 2a.
May be. When comparing the two, it is slightly
FIG. 3 is advantageous, and in terms of thermal efficiency, FIG.
Will be advantageous.In the above embodiment, the burner
5 for supplying primary air to the fan 5 and fan for the air supply device 9
12 is separate from the fan 12 as shown in FIG.
A portion of the combustion air supplied by the
If it is arranged to lead to the air introduction pipe 11,
It can be one fan. FIG. 6 and FIG. 7
Another embodiment is shown, in this case an air introduction pipe
11 in parallelEven more air to every corner in combustion case 1
To the air delivery pipe 16
And the front end opening 16a is connected to the exhaust port 1 in the same manner as in the above embodiment.
a and the air delivery pipe 16Opening and closing means in the middle of
15 were provided. The heat exchanger 4 has a long heat absorbing fin 3.
Consists of fins 31 and short fins 32, only long fins 31
The side with the coarse fins consisting of
The fins composed of the fins 31 and the short fins 32 are closely spaced.
Side is the downstream side of the combustion gas flow direction.The above is drain
I explained about prevention,Ejects from air ejection hole 10
By mixing air, the water pipe 2 of the heat exchanger 4
Can prevent the boiling of water in
Noise can be prevented. Also reduce the fire of burner 5Then fire
As the flow rate of the combustion gas becomes slow, the combustion gas
Is located longerIncreased thermal efficiency,
For this reason, the range for adjusting the tapping capacity is not enough to adjust the fire level.
EnclosureCan not be widened, but the air efficiency is
Can be reduced, and therefore its dispensing capacity
Can be used with a wide range of adjustments. More white smoke
Can be prevented. In addition, empty for a certain period of time after stopping use
If you make it blow out, you can lower the after-boil
it can.

[0007]

As described above, according to the present invention, air conduction is achieved.
Even without providing an air delivery pipe separately from the inlet pipe, heat
If drainage occurs in the exchanger, close the opening and closing
Air is blown out from the orifice to remove the combustion gas around the heat exchanger.
Dilution to prevent drainage and drainage to the heat exchanger
If no air flow occurs, open the opening / closing means and
The generation of drain and white smoke can be prevented.

[Brief description of the drawings]

FIG. 1 is a cutaway front view showing a first embodiment when the present invention is applied to a water heater.

FIG. 2 is a sectional view taken along the line II-II.

FIG. 3 is a cutaway side view of the main part.

FIG. 4 is a cutaway side view showing another example of the arrangement of the air introduction pipe.

FIG. 5 is a cutaway front view showing a second embodiment when the present invention is applied to a water heater.

FIG. 6 is a cutaway front view showing a third embodiment when the present invention is applied to a water heater.

FIG. 7 is a sectional view taken along the line VII-VII.

[Explanation of symbols]

2.2a ・ 2b Water passage pipe 3.3a ・ 3b ・ 31 ・ 32 Endothermic fins 4.4 ・ 4a ・ 4b Heat exchanger 5 Burner 9 Air supply device 10 Air ejection hole 11 Air introduction pipe 15 Opening / closing means 16 Air delivery pipe

Claims (1)

(57) [Claims] And 1. A heat exchanger having a water flow pipe finned, a burner for heating the heat exchanger, the combustion gas from the burner in which and a gas supply device for aerating, the air The device is connected to multiple heat exchanger fins.
An air introduction pipe in which the air ejection holes of
Of the combustion gas of the heat exchanger
Air whose tip opening faces the exhaust port located downstream in the flow direction
Opening and closing the delivery pipe and the air passage of the air delivery pipe
A hot water supply device comprising an opening and closing means .