JP3435976B2 - 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 reverse combustion type water heater, and more particularly to a technique for effectively removing unburned oil or the like generated due to poor ignition etc. from accumulating inside the equipment.

[0002]

2. Description of the Related Art A conventional reverse combustion type water heater, such as a petroleum water heater, has a structure shown in FIG. 5, for example.

In FIG. 1, reference numeral 1 denotes a can body which constitutes a heat exchanger, and a fan 2 and a burner 3 are provided on the top of the can body 1.
However, a pan-shaped exhaust gas collecting part 4 is arranged at the bottom of the can body 1, a water pipe 5 is wound around the body part of the can body 1, and the exhaust gas collecting part 4 is arranged in parallel with the can body 1. The silencer 6 is erected in this state.

In this structure, the burner 3 burns oil such as light oil to heat the water flowing through the water pipe 5 circulated around the body of the can 1. Further, the exhaust gas after combustion is discharged downward to the exhaust gas collecting portion 4, and further exhausted from the upper portion thereof via the silencer 6 to the outside.

[0005]

By the way, in the reverse combustion type water heater having the above structure, unburned oil droplets are generated due to poor ignition of the burner 3 or incomplete combustion of oil. Further, when the steam generated by oil burning adheres to a fin portion or the like (not shown) inside the can body 1, it is cooled and dewed here. Moreover, especially when the burner 3 is of the oil injection type, since the exhaust gas tends to flow concentratedly in the central portion of the can body 1, the unburned oil and water droplets generated as described above are discharged to the outside. Without being discharged, the particles gradually aggregate and stay in the exhaust gas collecting section 4.

When such unburned oil and water droplets stay at the bottom of the exhaust gas collecting portion 4 for a long period of time as they are, the exhaust gas collecting portion 4 gradually corrodes and holes are formed, from which unburned oil and the like are generated. The inconvenience of leaking to the outside occurs.

The present invention has been made in order to solve the above-mentioned problems, and allows unburned oil and water droplets to be promptly discharged to the outside without accumulating at the bottom of the exhaust gas collecting portion. An object is to reliably prevent inconveniences such as corrosion of the gathering portion.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a burner at the upper part of a heat exchanger that sandwiches a can body.
The following configuration is adopted in the reverse combustion type hot water heater in which the exhaust gas collecting portions are arranged at the lower portions, respectively.

That is, in the invention according to claim 1,
At the lower end of the can body, the exhaust gas collecting part through which the exhaust gas passes passes.
A receiving pan that is located in the over path and faces the burner side to receive unburned oil and water droplets is attached, and the exhaust gas is passed through this receiving pan to collect the exhaust gas.
The exhaust port is formed so as to flow out to the section .

In the invention according to claim 2, the exhaust port is
It is formed perpendicular to the exhaust passage at a plurality of locations on the peripheral side of the receiving pan.

[0011]

FIG. 1 is a sectional view showing a main part of a reverse combustion type oil water heater according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a portion indicated by reference symbol A in FIG. Therefore, the parts corresponding to those of the conventional example shown in FIG.

In FIGS. 1 and 2, reference numeral 1 is a can body that constitutes a heat exchanger, 4 is an exhaust gas collecting portion, 5 is a water pipe wound around the body of the can body 1, and 6 is a silencer.

In this embodiment, an exhaust gas distribution cover 10 is interposed at the joint between the lower end of the can body 1 and the exhaust gas collecting part 4, and the lower surface of the exhaust gas distribution cover 10 receives unburned oil and water droplets. A pan 12 is provided and located in the exhaust gas collecting section 4. Further, a sound deadening heat insulating material 14 is attached to the inner wall surface of the exhaust gas collecting portion 4.

FIG. 3 is a plan view showing the exhaust gas distribution plate 10 and the receiving pan 12 described above, and FIG. 4 is a side view of the same.

The exhaust gas distribution cover 10 is a substantially rectangular flat plate portion 1.
0a, the outer periphery of the flat plate portion 10a is protruded outward in two steps while protruding to form a step portion 10b, and the outer peripheral edge of the step portion 10b is folded back upward to form a partition portion 10c.
Is provided. Further, in the flat plate portion 10a, circular holes 10d are formed at three locations in the central portion thereof, and gas vent holes 10e are formed at the four corners of the upper, lower, left and right sides.

On the other hand, the receiving pan 12 has an oil receiving portion 12a in the shape of a rectangular dish, and an exhaust port 12d through which exhaust gas passes is provided at a plurality of locations (six locations in this example) on the circumferential side of the oil receiving portion 12a.
Is formed, and the bulging portion 12b bulges outward from the oil receiving portion 12a from the upper edge of the peripheral side portion of the oil receiving portion 12a.
Is formed, and further, the upper overhanging portion 12 that juts out outwardly from the bulging portion 12b and contacts the exhaust gas distribution plate 10 is formed.
c is formed.

The exhaust gas diversion lid 10 has the step portion 1 thereof.
0b is attached to the lower flange portion 1a formed at the lower end portion of the can body 1 with a screw or the like not shown in the state of being joined to the lower flange portion 1a through a packing 15, so that the partition portion 10c and the partition portion 10c are close to each other. The outer edge portion of the step portion 10b is located outside the can body 1. Further, a part of the outer edge portion of the step portion 10b is provided on the flange portion of the exhaust gas collecting portion 4 with the packing 1
It is abutting via 6. Further, the receiving pan 12 is attached to the lower surface of the step portion 10b at a position where the upper protruding portion 12c is close to the flat plate portion 10a of the exhaust gas distribution cover 10 by a screw or the like not shown.

In the above structure, the unburned oil and water drops that fall through the can body 1 are the flat plate portion 1 of the exhaust gas diversion lid 10.
Circular hole 10d and gas vent hole 10 received on 0a.
After passing through e, the oil is retained in the oil receiving portion 12a of the receiving pan 12. Further, the exhaust gas from the can body 1 passes through each gas vent hole 10e and the circular hole 10d of the exhaust gas flow dividing lid 10, and is further discharged to the exhaust gas collecting portion 4 through the exhaust port 12d of the receiving pan 12, and further the silencer. It is exhausted to the outside from the upper part via 6.

Here, the exhaust gas generated during normal combustion flows into the oil receiving portion 12a of the receiving pan 12 mainly through the gas vent holes 10e of the exhaust gas flow dividing lid 10, so that it already remains in the oil receiving portion 12a. The unburned oil and water droplets described above are vaporized by the heat of the exhaust gas, and are discharged to the outside from the exhaust port 12d through the exhaust gas collecting portion 4 and the silencer 6 together with the exhaust gas. Therefore, unlike the conventional case, unburned oil and water droplets do not stay at the bottom of the exhaust gas collecting portion 4, so that the exhaust gas collecting portion 4 is prevented from being corroded.

Exhaust gas from the can body 1 has a gas vent hole 10e in the exhaust gas diversion lid 10 and an exhaust port 12d in the receiving pan 12.
Since it is divided by passing through it, the exhaust is smoothly performed, and it becomes easier to contact with the sound deadening heat insulating material 14 provided in the exhaust gas collecting portion 4, so that noise generation is suppressed as compared with the conventional case.

Further, in the conventional structure, since the can body 1 and the exhaust gas collecting portion 4 are simply joined to each other through the packing, unburned oil or the like leaks to the outside through the packing. Although the inconvenience such as soiling the outer wall of the exhaust gas collecting portion 4 has occurred, in the configuration of the present invention, the unburned oil or the like falling from the can body 1 tries to ooze to the outside through the packing 15. After being blocked by the step portion 10b and the partition portion 10c of the exhaust gas distribution lid 10, it finally flows down to the oil receiving portion 12a of the receiving pan 12. Therefore, unburned oil or the like does not leak to the outside of the exhaust gas collecting portion 4.

[0022]

According to the present invention, the following effects can be obtained.

(1) In the invention according to claim 1, by providing the receiving pan, unburned oil and water droplets can be promptly discharged to the outside without staying at the bottom of the exhaust gas collecting portion for a long period of time. It is possible to reliably prevent the exhaust gas collecting portion from being corroded, and the reliability of the device is enhanced. Further, noise is reduced because the exhaust gas flow is also branched.

(2) According to the second aspect of the present invention, in particular, since the exhaust ports are formed perpendicularly to the exhaust passages at a plurality of locations on the peripheral side of the receiving pan, while evaporating the unburned oil,
Exhaust becomes easier.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a reverse combustion type oil water heater according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a portion indicated by reference numeral A in FIG.

FIG. 3 is a plan view showing an exhaust gas distribution plate and a receiving pan.

FIG. 4 is a side view showing an exhaust gas distribution plate and a receiving pan.

FIG. 5 is a cross-sectional view showing a main part of a conventional reverse combustion type oil water heater.

[Explanation of symbols]

1 ... Can body, 3 ... Burner, 4 ... Exhaust gas collecting part, 5 ... Water pipe,
6 ... Silencer, 10 ... Exhaust gas distribution cover, 12 ... Receiving pan, 1
2d ... Exhaust port.

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Claims (2)

(57) [Claims] 1. A burner is provided at an upper portion of the heat exchanger, which sandwiches the can body.
In a reverse combustion type water heater in which exhaust gas collecting parts are respectively arranged in the lower part, an exhaust gas collecting part through which exhaust gas passes is provided at a lower end part of the can body.
Of located in passing path, and receiving pan for receiving the unburned oil and water droplets to face the burner side is mounted, the exhaust gases are passed through the exhaust gas exhaust to the receiving pan
A water heater characterized in that an exhaust port that flows out to the collecting portion is formed. 2. The water heater according to claim 1, wherein the exhaust port is formed perpendicular to the exhaust passage at a plurality of positions on a peripheral side portion of the receiving pan.