JP3400244B2 - Natural convection type intake / exhaust type combustor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor of intake and exhaust type, which performs heat exchange with room air by natural convection.

[0002]

2. Description of the Related Art A burner, a heat exchange section, and a blower for forcedly blowing combustion air are provided in a frame of a combustor, an air intake port and an exhaust air outlet are provided on a back plate of the frame, and a heat exchange section in the frame body is provided. There is known a combustor that heats indoor air by means of which the combustion exhaust gas is discharged to the outside from an exhaust air outlet. In addition, in order to efficiently perform heat exchange in the heat exchange section, this type of intake and exhaust type combustor generally has a structure using a forced convection fan that blows indoor air to the heat exchange section.

However, the operating noise of this convection fan is quite noisy and is very annoying in a quiet room. Therefore, a combustor has been proposed in which indoor air is allowed to flow into the heat exchange section by natural convection without using a forced convection fan and heat is radiated by natural convection.

[0004]

By the way, the heat exchange by natural convection is very inefficient, and the heat may be trapped in the frame and the frame may reach an abnormally high temperature.
When a burner and a heat exchanging part were installed side by side using a short frame, the temperature of the hot air that escaped upward locally fluctuated, and heat could not be dissipated efficiently.

That is, the temperature of the hot air flowing upward from the air outlet is likely to be high around the burner, and there is a risk of burns due to the high temperature. On the other hand, around the heat exchange portion, the hot air escapes upward from the air outlet. Since the temperature of the warm air becomes low, it is necessary to equalize the temperature of the warm air flowing upward from the air outlet by natural convection.

[0006]

The present invention solves the above problems by improving the internal shapes of the heat exchanging portion and the frame body. The burner 2 is moved to one side inside the frame body 1 which is short and horizontally long. A combustion chamber 3 is continuously provided above the burner 2, an air inlet 4 and an exhaust outlet 5 are provided on the back plate 1a of the frame 1, and the air inlet 4 and the burner 2 are connected to each other. An air blower 6 for pressure-feeding the air taken in from the air intake port 4 to the burner 2 is attached between the exhaust air outlet 5 provided on the back plate 1a of the frame 1
The heat exchange part 7 is provided between the combustion chamber 3 and the combustion chamber 3, and the frame 1
The bottom plate is provided with an air inlet 8 and the upper plate of the frame 1 is provided with an air outlet 9 so that the air entering the frame 1 from the air inlet 8 is heated to a high temperature in the burner 2 or the heat exchange section 7. In the natural convection type heater that rises from the air outlet 9, the heat exchange section 7 is formed by a heat radiating cylinder 7a extending laterally from the upper part of the combustion chamber 3, and the heat radiating cylinder 7a is formed in the frame body 1. Extend it to the vicinity of one side, bend it downwards and extend it toward the burner 2, and further radiate the heat radiating cylinder 7a downward and extend it to one side of the frame 1, and set the tip of the heat radiating cylinder 7a to the exhaust air outlet 5. The burner 2 and the heat radiating cylinder 7a, the back plate 1a and the front plate 1 of the frame 1 are connected.
The heat shield plates 10 are attached between the heat shield plates 10b and 10b, respectively, and the space between the heat shield plates 10 is narrower on the exhaust air outlet 5 side than on the burner 2, and the space between the heat shield plates 10 is increased by entering from the air inlet 8. The generated air flows close to the heat radiating cylinder 7a, and the air rising from the upper part of the burner 2 and the upper part of the heat radiating cylinder 7a is raised to almost the same temperature.

In order to reduce the temperature of the hot air rising from the burner 2, the heat shield plate 10 located on the side of the burner 2
And a back plate 1a and a front plate 1b of the frame body 1 communicate with the air outlet 9, and an air port 11 communicating with the gap is provided in the bottom plate of the frame body 1 to remove air from the heat shield plate 10. It is designed to promote heat dissipation to the.

In order to improve heat radiation from the heat exchange section, the diameter of the heat radiating cylinder 7a extending from the upper portion of the combustion chamber 3 to the vicinity of one side of the frame 1 is folded downward from the vicinity of one side of the frame 1. Make it thicker than the diameter of the lower radiating cylinder 7a configured by bending,
This is to improve the heat dissipation of the part away from the burner 2.

Further, in order to increase the temperature of the warm air rising from the heat exchange section 7, the space between the heat shield plate 10 mounted between the back plate 1a and the front plate 1b of the frame 1 and the heat radiating cylinder 7a is set to the exhaust air blow. Exit 5
The heat shield plate 10 on the side of the exhaust air outlet 5 which is arranged at a narrower side and has a narrower interval is extended above the heat radiation cylinder 7a, and
By narrowing the distance between the tips in a tapered shape, air is retained within the distance and the amount of air passing through is reduced.

[0010]

With the shape of the frame 1 which is short and long in the horizontal direction, the heat exchange section cannot be arranged above the burner, and the burner 2 and the heat exchange section 7 must be arranged side by side. Therefore, the temperature of the air after heat exchange, which escapes from the bottom plate to the upper plate of the frame 1 by natural convection, is different in the amount of heat released between the burner 2 which is the heat generating part and the heat exchange part 7 which is separated from the burner 2. The temperature of the warm air rising from the air outlet 9 is greatly different.

According to the present invention, the heat exchanging portion 7 is composed of the heat radiating cylinder 7a, and the heat radiating cylinder 7a is meandered downward to increase the heat exchanging area, and further, the heat shield plate 10 is located so as to sandwich the heat radiating cylinder 7a. Is made narrower than that of the burner 2 to allow air to flow closer to the heat radiating cylinder 7a, thereby increasing the temperature of the warm air near the heat exchange section 7.

On the other hand, in order to lower the temperature of the air flowing upward from the vicinity of the burner 2, the heat shield plate 10 near the burner 2 is provided.
The gap formed by the frame 1 and the frame body 1 is communicated with the air outlet 9, and the air is also flown into the gap, so that the temperature of the heat shield plate 10 decreases and the amount of warm air rising near the burner 2 increases. Also, the temperature of warm air becomes low.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure will be described with reference to the drawings showing an embodiment. 1 is a frame body of a short intake and exhaust type combustor, and 2 is a pot type oil combustor attached close to one side in the frame body. The configured burners 3 are combustion chambers that are continuously attached to the upper portion of the burner 2. 12 is a constant oil level gauge connected to an oil tank (not shown) for supplying fuel to the burner 2, 13 is an electromagnetic pump attached to the constant oil level gauge 12, and the fuel sent from the oil tank has a low oil level. The container 12 maintains a predetermined oil level, and the fuel within the constant oil level is pumped up by the electromagnetic pump 13 and sent to the burner 2.

Reference numeral 4 is an air intake port arranged in the back plate 1a of the frame 1, 14 is an air supply passage for combustion air from the air intake port 4 to the burner 2, and 6 is a blower attached to the air supply passage 14. The blower 6 is attached to the back plate 1a of the frame 1 while being located inside the frame 1, the fan casing 15 is fixed to the outside of the back plate 1a, and when the blower 6 rotates, the air supply passage 14
The combustion air is blown into the burner to supply the combustion air to the burner.

Reference numeral 5 is an exhaust air outlet also arranged on the back plate 1a of the frame 1, 7 is a heat exchange portion connecting the exhaust air outlet 5 and the upper portion of the combustion chamber 3, and 7a is heat radiation constituting the heat exchange portion 7. The combustion exhaust gas emitted from the combustion chamber 3 radiates heat when passing through the heat radiating cylinder 7 a and is exhausted from the exhaust air outlet 5. The air inlet 4 and the exhaust outlet 5 are connected to an intake / exhaust top (not shown) and use outdoor air for combustion and discard the combustion exhaust gas to the outside.

Reference numeral 8 denotes an air inlet provided on the bottom plate of the frame 1, and 9
Is an air outlet provided on the upper plate of the frame 1, and in the intake / exhaust type combustor of the present invention, the air entering the frame 1 from the air inlet 8 at the bottom of the frame 1 is the burner 2 ... After rising inside the frame 1 toward the combustion chamber 3 and the heat exchange section 7, it becomes hot air after the heat exchange and is blown into the room from the air outlet 9 in the upper part of the frame 1. For this reason, the convection fan does not have a convection fan for exchanging heat with the indoor air, and the operating noise of the convection fan that is always attached to the conventional hot air combustor for heating is not generated. Moreover, the combustor can be used even in a quiet room without harsh noise.

The heat exchanging portion 7 of the present invention is a meandering radiator tube 7.
The heat radiating cylinder 7a, which is composed of a and extends laterally from the upper part of the combustion chamber 3, bends the tip downward near one side of the frame 1 and extends toward the burner 2, and then the heat radiating cylinder. The tip of 7a is bent downward and extends toward the side of the frame 1 again, and this tip is connected to the exhaust air outlet 5. Therefore, since the heat radiating cylinder 7a is meandering, the heat radiating area is large, and the problem that the heat radiating amount from the heat exchanging portion which is common in the natural convection type combustor is small and the heat radiating amount near the burner 2 is large is solved. It is a thing.

Reference numeral 10 denotes a heat shield plate provided between the back plate 1a and the front plate 1b of the frame 1 and the burner 2 and the heat radiating cylinder 7a, respectively. The distance between the two heat shield plates 10 is that of the burner 2. The interval in the vicinity of the heat exchange portion 7 closer to the exhaust air outlet 5 than in the portion is set to be narrower. Therefore, the room air entering from the air inflow port 8 comes close to the heat radiating cylinder 7a as the space between the heat shields 10 rises, and promotes heat exchange to raise the temperature. It was possible to raise the temperature of the hot air in the vicinity of the heat exchange section 7 to a temperature comparable to the temperature of the hot air in the vicinity of.

Reference numeral 11 denotes a heat shield plate 1 located on the side of the burner 2.
0 and the back plate 1a and the front plate 1b of the frame 1 are connected to an air gap, which communicates with an air outlet 9 provided on the upper plate of the frame 1 and has an air port 11 The air that has entered the gap from the outside cools the heat shield plate 10 from the outside, reaches a high temperature and is blown out from the air outlet 9, and has a function of keeping the temperature of the heat shield plate 10 low. Therefore, although the amount of warm air blown out from the air outlet 9 near the burner 2 is increased, the maximum temperature is suppressed, and the variation with the hot air temperature of the air outlet 9 near the heat exchange unit 7 is reduced. It is a thing.

Further, the heat radiating cylinder 7a extending laterally from the upper portion of the combustion chamber 3 is made thicker than the heat radiating cylinder 7a which meanders and is positioned below, so that the combustion gas sent from the burner 2 to the combustion chamber 3 can be smoothly moved. Since it flows into the heat radiating cylinder 7a, even when the burner 2 and the heat exchanging section 7 are arranged side by side in the short frame 1, the high-temperature combustion gas can be sent to the end of the frame 1 and the heat exchanging section 7a. The temperature of the warm air blown out from the air outlet 9 near is higher. Further, since the heat radiating cylinder 7a at the upper part, which becomes high in temperature, is close to the air outlet 9, the card 9a attached to the air outlet 9 is heated by radiant heat, and the air outlet 9 is heated.
It was possible to blow out the hot air blown out from the high temperature without cooling.

Further, since the diameter of the lower heat radiating cylinder 7a meandering downward with respect to the upper heat radiating cylinder 7a is made small, heat is sufficiently radiated by the upper heat radiating cylinder 7a and the combustion gas flows to the lower radiating cylinder 7a. On the other hand, even if the combustion gas with advanced heat dissipation is still higher in temperature than the indoor air, the air that has entered the frame 1 by natural convection is preheated by the lower heat dissipation tube 7a, and the temperature is raised. Since it is heated more strongly by the upper heat radiation tube 7a, the temperature of the hot air at the air outlet 9 near the heat exchange section 7 becomes high.

Further, since the upper end of the heat shield plate 10 which is located across the heat dissipation pipe 7a extends higher than the heat dissipation pipe 7a, and is formed in a tapered shape so that the distance between the two heat shield plates 10 becomes narrow. As for the air that has entered the frame 1 from the air inlet 8, the warm air that rises in the vicinity of the heat radiating cylinder 7a is likely to escape smoothly, while the air that rises along the heat shield plate 10 has a large flow path resistance. As a result, the temperature of the hot air is maintained at a high temperature because the temperature rises slowly and stays there, is heated to a high temperature, and then flows into the air inlet 9.

[0023]

As described above, according to the present invention, the heat radiating cylinder 7a extending laterally from the upper portion of the combustion chamber 3 is provided, and the tip of the heat radiating cylinder 7a extends to the vicinity of one side of the frame 1 and is bent downward to burner. Since the tip end is bent downward and meandered toward 2, the heat dissipation area of the heat exchange section 7 increases, and a large amount of heat can be dissipated from the heat exchange section 7.

Further, a gap formed by the heat shield plate 10 near the burner 2 and the back plate 1a and the front plate 1b of the frame body 1 is communicated with the air outlet 9, and from the air port 11 of the bottom plate of the frame body 1. Since the indoor air is allowed to flow into the gap, the temperature of the heat shield plate 10 is lowered, and even if the amount of warm air rising from the air outlet 9 near the burner 2 is increased, the warm air temperature is lowered and the vicinity of the burner 2 is increased. The temperature of the air rising from the air outlet 9 near the heat exchange section 7 is averaged.

On the other hand, the heat exchanging plates 7 arranged with the heat radiating cylinder 7a sandwiched therebetween have a narrower heat exchanging portion 7 than the burner 2, so that air can flow closer to the heat radiating cylinder 7a. The temperature of the warm air rising from the air outlet 9 can be maintained at a high temperature even near the heat exchanging portion 7 which is separated from the burner 2.

Further, the heat radiating cylinder 7a extending from the upper part of the combustion chamber 3 to one side of the frame 1 increases the diameter of the upper part near the air outlet 9 connected to the combustion chamber 3 and makes the lower part meandering downward. Since the diameter of the heat radiating cylinder 7a is made small, the high-temperature combustion gas generated in the burner 2 does not stay in the combustion chamber 3 and immediately flows into the radiating cylinder 7a having a large diameter.
Also, the amount of heat radiated from the combustion chamber 3 is reduced, and the heat radiation from the heat radiating cylinder 3 is promoted.

Further, since the diameter of the heat radiating cylinder 7a meandering downward is made small, even if the exhaust gas near the exhaust gas outlet 5 is radiated, the air from the air inlet 8 of the bottom plate of the frame 1 to the frame The temperature of the hot air rising from the air outlet 9 in the vicinity of the heat exchanging part 7 is pre-heated by the pre-heating of the air entering the inside of 1 and the pre-heated air is heated by the upper radiating cylinder 7a extending from the combustion chamber 3. Is high.

The distance between the two heat shield plates 10 mounted between the back plate 1a and front plate 1b of the frame 1 and the heat radiating cylinder 7a is as follows.
Since the side of the exhaust air outlet 5 where the heat exchange section 7 is located is narrowed, and the heat shield plate 10 is extended above the heat radiating cylinder 7a and the interval between the upper tips is narrowed in a tapered shape, the tapered portion shields. The resistance of the air rising along the heating plate 10 makes it difficult for the air to pass through, and most of the air rises while exchanging heat with the surface of the heat radiating cylinder 7a in the central portion, so the temperature of the warm air is maintained at a high temperature. It is made, and the interval is tapered, the blowing speed of high temperature warm air is increased, and
The warm air rising speed in the vicinity of the burner 2 and the vicinity of the heat exchange section 7 are uniform.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the structure of a combustor showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of a combustor showing an embodiment of the present invention.

3 is a cross-sectional view taken along the line AA of the combustor shown in FIG.

FIG. 4 is a BB cross-sectional view of the combustor shown in FIG.

[Explanation of symbols]

1 frame 1a Back plate 1b front plate 2 burners 3 Combustion chamber 4 Air inlet 5 Exhaust outlet 6 blower 7 heat exchange section 7a Heat sink 8 air inlets 9 Air outlet 10 heat shield 11 air port

Claims (4)

(57) [Claims] 1. A burner 2 is attached to one side inside a frame body 1 which is short and long and is horizontally long, and a combustion chamber 3 is continuously provided above the burner 2 and is attached to a back plate 1a of the frame body 1. Is provided with an air inlet 4 and an exhaust outlet 5, and the air inlet 4 and the burner 2
A blower 6 for pressure-feeding the air taken in from the air intake port 4 to the burner 2 is attached between the heat exchanger 7 and the exhaust gas outlet 5 provided in the back plate 1a of the frame 1 and the combustion chamber 3. At the same time, the bottom plate of the frame body 1 is provided with an air inlet 8 and the top plate of the frame body 1 is provided with an air outlet 9 so that the frame body 1 can be opened from the air inlet 8.
In a natural convection type heater in which the air entering the inside of the burner 2 and the heat exchanging part 7 becomes hot and rises from the air outlet 9, the heat exchanging part 7 is a heat dissipation device that extends laterally from the upper part of the combustion chamber 3. It is formed of a cylinder 7a, and the heat dissipation cylinder 7a extends to the vicinity of one side of the frame 1 and is bent downward to extend toward the burner 2.
Further, the heat radiating cylinder 7a is bent downward and extended toward one side of the frame body 1, the tip of the heat radiating cylinder 7a is connected to the exhaust air outlet 5, and the burner 2 and the heat radiating cylinder 7a and the back of the frame body 1 are connected. Board 1
a heat shield plate 10 is attached between the heat shield plate 10a and the front plate 1b. The heat shield plate 10 is arranged closer to the exhaust air outlet 5 side than the burner 2 and enters from the air inlet 8 to receive the heat shield plate 10. Of the natural convection type intake / exhaust combustor characterized in that the air rising in the interval of the above flows near the heat radiating cylinder 7a and raises the air rising from the upper part of the burner 2 and the upper part of the heat radiating cylinder 7a to substantially the same temperature. . 2. A heat shield plate 10 located on the side of the burner 2.
And the back plate 1a and the front plate 1b of the frame body 1 communicate with the air outlet 9, and an air port 11 communicating with the gap is provided in the bottom plate of the frame body 1 so that the heat shield plate 10 The natural convection type intake / exhaust combustor according to claim 1, which promotes heat dissipation. 3. The diameter of a heat radiating cylinder 7a extending from the upper portion of the combustion chamber 3 to the vicinity of one side of the frame 1 is smaller than the diameter of a lower heat radiating cylinder 7a formed by bending downward from the vicinity of one side of the frame 1. The natural convection type intake / exhaust combustor according to claim 1, which is thickened. 4. The space between the heat shield plates 10 mounted between the back plate 1a and the front plate 1b of the frame 1 and the heat radiating cylinder 7a has an exhaust air outlet 5
The heat shield plate 10 on the side of the exhaust air outlet 5 which is arranged at a narrower side and has a narrower interval is extended above the heat radiation cylinder 7a, and
The natural convection type intake / exhaust type combustor according to claim 1, wherein the interval between the tips is tapered.