JP2002213822A - Gas warm air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a technique wherein the height of a gas warm air heater is reduced, while fully mixing combustion gas and air. SOLUTION: A combustion case 30 is accommodated at a rear position in a body case 22, and includes therein a gas burner 36 and a combustion gas exhaust outlet 30b in the upper portion. A fan 46 is accommodated in the body case 22 in front of the combustion case 30 and at a height where it overlaps on the combustion case 30, and communicates with a warm air blow-off outlet 48 and is higher than the combustion case 30 in its height. A mixing space 52 is located rearward of a front plate of the body case 22, in frontal of the front plate of the combustion case 30, and at an upper portion of the fan 46, where air sucked from the air suction inlet 27 and combustion gas exhausted from the combustion gas exhaust outlet 30b are mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a gas warm air heater.

[0002]

2. Description of the Related Art An example of a conventional gas warm air heater is disclosed in Japanese Utility Model Laid-Open No. 6-40763. This gas warm air heater will be described with reference to FIG. The conventional gas warm air heater shown in FIG.
And a fan 46 and the like. The main body case 22 has an air inlet 27 formed on the back surface and a warm air outlet 48 on the front surface.
Is formed, and forms the outer frame of the gas warm air heater. The combustion case 30 has a gas burner 36 inside,
A combustion gas outlet 30b is formed in the upper part. The fan 46 is provided below the combustion case 30, and communicates with the hot air outlet 48. In the body case 22,
Air passages 25, 24, 29 are formed. The air passage 25 is formed between the main body case 22 and the partition plate 31 and cools the main body case 22. The air passage 24
It is formed between the partition plate 31 and the flow dividing plate 28. The air passage 29 is formed between the flow dividing plate 28 and the combustion case 30.

When the gas burner 36 is ignited, the primary air for combustion sucked from a primary air inlet for combustion (not shown) and the secondary air for combustion sucked from the secondary air intake for combustion 30a as shown by an arrow D are shown. As a result, the fuel gas is burned. The combustion gas generated by this combustion is discharged from a combustion gas discharge port 30b formed in the upper part of the combustion case 30 as shown by an arrow C. During combustion, the combustion gas is sucked from the combustion gas outlet 30b by the rotation of the fan 46. During the combustion, at the same time, by the rotation of the fan 46,
Air in the room is sucked into the air passage 29 as shown by an arrow B. As a result, the combustion gas shown by arrow C and the air shown by arrow B are first mixed.

At the same time, the air in the room is sucked into the air passage 24 as shown by an arrow A by the rotation of the fan 46. As a result, the combustion gas indicated by the arrow C and the air indicated by the arrow A are mixed in the mixing passage 52. That is, the air sucked from the air inlet 27 by the fan 46 moves downward in front of the front plate of the combustion case 30. The fan 46 also sucks the combustion gas from the combustion gas outlet 30b, and the sucked combustion gas moves downward in front of the front plate of the combustion case 30. While moving down the front of the front plate of the combustion case 30, the air and the combustion gas are mixed and adjusted to a moderate temperature. Further, by the rotation of the fan 46, indoor air is sucked from the air passage 25 as shown by an arrow F. This air flows inside the main body case 22 to cool the main body case 22, and finally enters the mixing space 52 from the inlet 31a, and is further mixed with the mixed gas coming from the upstream side.
The mixed gas thus mixed becomes hot air at an appropriate temperature. This warm air is guided to the warm air outlet 48 along the fan casing 40 by the rotation of the fan 46, and is blown out from the warm air outlet 48. The room is heated by the warm air. According to this gas hot air heater, since the fan 46 is provided below the combustion case 30, the depth of the gas hot air heater can be reduced.

[0005]

However, depending on the installation location of the gas hot air heater, there are many cases where it is desired to reduce the height without much problem with the depth. For example, when a hot air heater is installed in the lower part of the kitchen, the depth does not matter so much, and it is desired to make the height lower than that. In the conventional gas warm air heater shown in FIG. 5, since the fan 46 is provided below the combustion case 30, the depth of the gas warm air heater can be reduced, but the height is reduced. There was a limit. However, even if the height of the gas hot air heater is reduced, the combustion case 30 and the fan 46 cannot simply be juxtaposed in the horizontal direction. If the combustion case 30 and the fan 46 are simply juxtaposed in the horizontal direction, the mixing space 52 cannot be sufficiently secured, and the combustion gas and the air are sucked into the fan 46 without being sufficiently mixed. Is overheated to cause thermal deformation of the fan 46.

SUMMARY OF THE INVENTION It is an object of the present invention to realize a technique for lowering the height of a gas hot air heater while sufficiently mixing a combustion gas and air.

[0007]

Means for Solving the Problems, Functions and Effects The gas warm air heater of the present invention comprises a main body case, a combustion case,
It has a fan, a mixing space, and an air passage. The main body case has an air inlet formed on the back surface, a hot air outlet formed on the front surface, and forms an outer frame of the gas hot air heater. The combustion case has a gas burner inside, has a combustion gas discharge port formed at the top, and is housed at a rear position in the main body case. The fan is accommodated in the main body case in front of the combustion case and at a height overlapping with the combustion case, communicates with the hot air outlet, and is shorter than the combustion case. The mixing space is located behind the front plate of the main body case, in front of the front plate of the combustion case, and above the fan, and the air sucked from the air suction port and the combustion gas discharged from the combustion gas discharge port. Mix. The air passage extends from the air suction port around the combustion case to the mixing space. Note that the entire fan may be provided at a height overlapping the combustion case, or a part of the fan may be provided at a position overlapping the combustion case.

As described with reference to FIG. 5, in a gas warm air heater, it is necessary to sufficiently mix a combustion gas and air to form a mixed gas having an appropriate temperature before sending it to a fan. In the conventional technique shown in FIG.
The combustion gas and the air are sufficiently mixed by arranging the upper and lower parts vertically to secure a sufficient length of the mixing space 52.

In the present invention, the fan is shorter than the combustion case in order to sufficiently mix the combustion gas and the air. Thus, the air sucked from the air inlet and the combustion gas discharged from the combustion gas outlet are located behind the front plate of the main body case, in front of the front plate of the combustion case, and above the fan. It is possible to secure a space for mixing. Since this mixing space was secured, the combustion case and the fan could be arranged side by side in the horizontal direction. That is, since such a mixing space can be ensured, even if the combustion case and the fan are juxtaposed horizontally, it is possible to prevent the combustion gas and the air from being sucked into the fan with insufficient mixing.

[0010] As described above, according to the gas hot air heater of the present invention, the combustion case and the fan can be juxtaposed in the horizontal direction. Therefore, compared with the conventional gas hot air heater in which the fan is provided below the combustion case. Thus, the height of the gas warm air heater can be reduced. In addition, by making the fan shorter than the combustion case, a large mixing space can be secured in the space above the fan, so that the cross-sectional area of the mixing space (this space can be called the passage of combustion gas and air) is reduced. Can be wider. Further, the length of the mixing space (passage of combustion gas and air) can be reduced while securing a space for sufficiently mixing the combustion gas and air. That is, since the mixing space (passage of combustion gas and air) can be shortened widely, the fan required to send out the same amount of hot air as compared with the conventional gas hot air heater is required. The number of revolutions can be reduced. As a result, the operating noise of the gas warm air heater can be reduced, and the power consumption can be reduced.

[0011] The front plate of the main body case defining the mixing space,
It is preferable to incline so that the lower part protrudes forward. According to the present invention, an effective mixing space can be ensured while reducing the volume of the main body case. Further, the passage resistance can be further reduced, and the rotation speed of the fan can be further reduced.

Preferably, a stabilizer is formed at a lower extension of the front plate of the main body case. ADVANTAGE OF THE INVENTION According to this invention, the height of a gas warm air heater can be reduced and depth can be suppressed small.

An air passage bypassing above the combustion case;
It is effective to secure two systems of air passages, that is, an air passage that bypasses below the combustion case. According to the present invention, since the two air passages are secured, the combustion gas and the air can be more effectively mixed.

It is effective to form a notch for replacing a thermocouple in a guide wall extending upward in front of the front plate of the combustion case. In the present invention, the guide wall guides the hot air mixed in the mixing space to the hot air outlet. When the fan and the combustion case are juxtaposed horizontally, the guide wall extends upward in front of the front plate of the combustion case. A thermocouple is required in the combustion case, and the thermocouple may be replaced. Therefore, if a notch for replacing the thermocouple is formed in the guide wall, the replacement operation can be easily performed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, features of the embodiments described below will be summarized. (Mode 1) The guide wall extends upward at a distance from the front plate of the combustion case. According to this aspect, the guide wall secures an air passage that bypasses the lower part of the combustion case. (Embodiment 2) As the guide wall of Embodiment 1 extends upward, it largely separates from the combustion case. According to this aspect, since the guide wall is formed so as to be separated from the combustion case as it extends upward, it is easy to move the hand upward when a hand is inserted between the guide wall and the combustion case from below. Therefore, it is easy to replace the thermocouple (thermocouple) attached above the guide wall and near the combustion case. (Mode 3) The guide wall is in contact with the front plate of the combustion case. According to this embodiment, the depth of the gas warm air heater can be reduced. (Fourth Embodiment) The front plate of the main body case is formed of a double plate having an interval therebetween. In this form of gas warm air heater,
There is no need to cool the front plate, since it is effectively mixed in the mixing space and brought to an appropriate temperature. The temperature of the front plate of the main body case is maintained within a safe range only by forming the main plate with a double plate having an interval therebetween.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments embodying the present invention will be described with reference to the drawings. First, a configuration of a gas hot air heater according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of a gas hot air heater according to an embodiment of the present invention.
As shown in FIG. 1, the gas hot air heater according to the present embodiment includes:
An outer frame is formed by a main body case (also called a hood) 22. An air filter 26 is provided on the rear surface of the main body case 22 from the upper rear surface to the lower rear surface.
The air filter 26 has an air inlet 27 formed therein. A warm air outlet 48 is provided at a lower front portion of the main body case 22.
Are formed.

A combustion case 30 is accommodated at a rear position in the main body case 22. On the rear side of the main body case 22 of the combustion case 30, a secondary air inlet 30a for combustion is formed. A combustion gas outlet 30b is formed in an upper portion of the combustion case 30. A combustion chamber 32 is formed inside the combustion case 30. This combustion chamber 3
2, a gas burner 36 is provided. A gas pipe is connected to the gas burner 36 via a main valve, a safety valve, and a flow control valve (not shown). Above the gas burner 36, an enclosure 34 surrounding the combustion flame of the gas burner 36 is provided. The gas burner 36 is connected to a primary combustion air passage (not shown).

Above the combustion case 30, a flow dividing plate 28 having a mountain-shaped cross section is provided. An upper plate of the main body case 22 is provided above the flow dividing plate 28.
8 and the upper plate of the body case 22, the first air passage 2
4 are formed. A second air passage 29 is formed between the flow dividing plate 28 and the combustion case 30. A third air passage 38 is formed between a lower portion of the combustion case 30 and a lower plate of the main body case 22. These air passages 2
Each of 4, 29 and 38 bypasses the periphery of the combustion case 30 and communicates with the air suction port 27 on the back of the main body case 22. Since the three air passages 24, 29, and 38 are formed, the combustion gas and the air can be more effectively mixed.

A fan 46 is accommodated in a lower portion of a front portion in the main body case 22. The fan 46 is provided in front of the combustion case 30 and at a height overlapping the combustion case 30 when viewed from the horizontal direction. Therefore, the fan 46 as shown in FIG.
The height of the gas warm air heater can be reduced as compared with a conventional gas warm air heater provided below.
The fan 46 is formed in a cylindrical shape, is a centrifugal fan, and is rotationally driven by a motor (not shown). A fan casing 40 is provided around the fan 46 so as to cover the fan 46. This fan casing 40
Accordingly, the fan 46 and the hot air outlet 48 communicate with each other.

A guide wall 42 is formed in the fan casing 40 so as to separate the fan 46 from the combustion case 30. The guide wall 42 is provided for the combustion case 30.
Of the front plate extends upward at a distance from the front plate. The guide wall 42 guides the hot air mixed in the mixing space 52 to be described later to the hot air outlet 48, and guides the air passing through the third air passage 38 bypassing below the combustion case 30 to the mixing space 52. Play a role. The guide wall 42 is curved along the fan 46 so as to be separated from the front plate of the combustion case 30 as extending upward. Therefore, when a hand is inserted between the guide wall 42 and the combustion case 30 from below, it is easy to move the hand upward. Therefore, it is easy to replace the thermocouple (thermocouple) 54 attached above the guide wall 42 and near the combustion case 30. Further, a stabilizer 5 is provided at a front portion of the fan casing 40.
0 is formed. The stabilizer 50 is formed at a lower extension of the front plate of the main body case 22. For this reason, the height of the gas warm air heater can be reduced, and the depth can be reduced. The suction force of the fan 46 can be adjusted by adjusting the shapes of the guide wall 42 and the stabilizer 50 and the distance between the guide wall 42 or the stabilizer 50 and the fan 46.

The fan 46 is held shorter than the combustion case 30. Therefore, a sufficiently large mixing space 52 can be secured behind the front plate of the main body case 22 and in front of the front plate of the combustion case 30 and above the fan 46. The mixing space 52 communicates with the first to third air passages 24, 29, and 38 and the combustion gas outlet 30 b of the combustion case 30. Thus, the fan 46
Is made shorter than the combustion case 30, a large mixing space 52 can be secured in the space above the fan 46, so that the cross-sectional area of the mixing space (this space can be said to be a passage of combustion gas and air) 52 N can be increased. Further, it is possible to shorten the length of the mixing space (the passage of the combustion gas and the air) 52 while securing a space for sufficiently mixing the combustion gas and the air. That is, since the mixing space (combustion gas and air passage) 52 can be widened and shortened, the fan required to send out the same amount of hot air as in the conventional gas hot air heater is required. The number of rotations of 46 can be reduced. As a result, the operating noise of the gas warm air heater can be reduced, and the power consumption can be reduced.

Further, since the negative pressure surface M can be made wider than that of the conventional gas hot air heater, the suction of the hot air by the fan 46 is performed more effectively. Further, since the space between the front plate of the main body case 22 and the combustion case 30 is widened, the heat of the combustion gas discharged from the combustion case 30 is less likely to be transmitted to the front surface 22a of the front plate of the main body case 22. Therefore, an air passage 2 for cooling the front plate of the main body case 22, such as the conventional gas warm air heater shown in FIG.
5 may not be provided separately.

The effect of reducing the operating noise by the gas hot air heater according to this embodiment will be described with reference to FIG. FIG. 2 is a diagram comparing the operation sounds of the conventional gas hot air heater and the gas hot air heater according to the present embodiment. In both cases, the calorific value of combustion is 200
It was set to 0 kcal / h. First, the fan 46 is connected to the combustion case 30.
When the fan rotation speed is set to 1030 rpm with a conventional gas hot air heater (substantially the same as the gas hot air heater shown in FIG. 5) provided below, the hot air outlet 48
The average value of the temperature of the hot air was 60.8K, and the operating noise was 36.4dB. On the other hand, when the number of revolutions is 900 rpm in the gas hot air heater according to the present embodiment shown in FIG.
7K, and the driving noise was 34.2 dB. According to the present example, it was found that a large amount of air could be sucked in at a slower fan speed than in a conventional gas hot air heater, and the hot air temperature could be reduced. Since the fan speed can be reduced, the operating noise can be reduced by 2.2 dB. In the case of blowing out the hot air having the same temperature and the same air volume as the conventional one, it is possible to further reduce the fan rotation speed and further reduce the operation sound. The experiment of FIG. 2 has confirmed that the warm air of the same calorific value as the conventional one can be sent out at a lower fan rotation speed as a warmer air of a lower temperature and a larger air volume.

As shown in FIG. 1, the portion of the front plate of the main body case 22 that defines the mixing space 52 is inclined so as to project forward as it goes downward. Therefore, the main body case 2
An effective mixing space 52 can be ensured while reducing the volume of the second. Further, the passage resistance can be further reduced, and the rotation speed of the fan 46 can be further reduced. In addition, a portion of the front plate of the main body case 22 that defines the mixing space 52 is a double plate having a distance L therebetween. For this reason, the mixture is effectively mixed in the mixing space 52 to have an appropriate temperature, and there is no need to cool the front plate of the main body case 22. The temperature of the front surface 22a of the front plate of the main body case 22 is maintained within a safe range only by forming the double plate with a space therebetween.

Next, the operation of the gas hot air heater according to this embodiment will be described with reference to FIG. When the gas burner 36 is ignited, fuel supplied from a gas pipe (not shown) is drawn from a primary air for combustion sucked from a primary air suction port for combustion (not shown) and an arrow D from the secondary air suction port 30a for combustion. As shown in (2), it is burned together with the sucked secondary air for combustion. The combustion gas generated by this combustion is supplied to the combustion case 3
0 from the combustion gas outlet 30b formed at the top of
Is discharged as shown. During combustion, the combustion gas is sucked from the combustion gas outlet 30b by the rotation of the fan 46. At the same time, the air in the room is sucked from the second air passage 29 as shown by the arrow B by the rotation of the fan 46 during the combustion. As a result, the combustion gas shown by arrow C and the air shown by arrow B are first mixed.

At the same time, the air in the room is sucked from the first air passage 24 as shown by the arrow A by the rotation of the fan 46. Further, air is sucked from the third air passage 38 as shown by an arrow E. As a result, the combustion gas indicated by the arrow C and the air indicated by the arrows A and E are mixed in the mixing space 52. That is, the air sucked by the fan 46 from the air inlet 27 through the first air passage 24 moves downward from above the front plate of the combustion case 30 toward the mixing space 52. Further, the air sucked through the third air passage 38 moves upward from below the lower plate of the combustion case 30 toward the mixing space 52. The fan 46 also sucks the combustion gas from the combustion gas outlet 30b, and the sucked combustion gas moves downward in front of the front plate of the combustion case 30. While moving downward in front of the front plate of the combustion case 30, the air and the combustion gas are mixed and adjusted to a moderate temperature. This warm air is guided to the warm air outlet 48 along the fan casing 40 by the rotation of the fan 46, and is blown out from the warm air outlet 48. The room is heated by the warm air. According to the present embodiment, since the mixing space 52 is sufficiently wide and the combustion gas and air are sufficiently mixed, the fan 46 does not overheat.

Next, a gas warm air heater according to another embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 4 is a cross-sectional view of a gas hot air heater according to another embodiment of the present invention, and FIG. 4 is a view of a notch in a guide wall as viewed from the front side. The gas warm air heater shown in FIG.
The lower part of the front plate 0 and the guide wall 42 are in close contact with each other.
As a result, there is no third air passage bypassing below the combustion case 30. However, according to this embodiment, too, the high temperature of the combustion gas can be sufficiently lowered by the air from the first and second air passages 24 and 29.
According to this embodiment, since the lower portion of the front plate of the combustion case 30 and the guide wall 42 are in close contact, the depth of the gas hot air heater can be reduced. In this case, the guide wall 42 extending upward in front of the front plate of the combustion case 30.
As shown in FIG. 4, which is a view from the front side, the notch 42a is provided in the mounting portion of the thermocouple 54, so that the thermocouple 54 can be easily replaced.

As described above, the gas warm air heater according to the embodiment of the present invention has been described, but the scope of the present invention is not limited to the above embodiment. The present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas hot air heater according to an embodiment of the present invention.

FIG. 2 is a diagram showing a comparison of operation sounds between a conventional gas hot air heater and the gas hot air heater according to the present embodiment.

FIG. 3 is a sectional view of a gas hot air heater according to another embodiment of the present invention.

FIG. 4 is a view of the notch of the guide wall as viewed from the front side.

FIG. 5 is a sectional view of a conventional gas warm air heater.

[Description of Signs] 22: Main body case, 22a: Surface of front plate 24, 29, 38: Air passage 26: Air filter 27: Air suction port 28: Dividing plate 30: Combustion case, 30a: Secondary air suction for combustion Mouth, 3
0b: Combustion gas outlet 32: Combustion chamber 34: Enclosure 36: Gas burner 40: Fan casing 42: Guide wall, 42a: Notch 46: Fan 48: Hot air outlet 50: Stabilizer 52: Mixing space 54: Thermocouple

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuki Nishio 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Prefecture Inside Rinnai Corporation (72) Inventor Tomoya Akabori 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi, Aichi No. R-terminus F term (reference) 3L028 AA01 AC01 AC06

Claims (5)

[Claims] 1. A main body case having an air inlet formed on a back surface, a hot air outlet formed on a front surface, and forming an outer frame of a gas hot air heater, a gas burner inside, and a combustion gas in an upper portion. A discharge case is formed, and the combustion case is housed at a rear position in the main body case.The combustion case is housed in the main body case in front of the combustion case and at the same height as the combustion case. A fan connected to the outlet and shorter than the combustion case, located behind the front plate of the main body case, in front of the front plate of the combustion case, and above the fan, and with air sucked in from the air suction port A space for mixing the combustion gas discharged from the combustion gas discharge port, and an air passage formed in the main body case from the air suction port to bypass the periphery of the combustion case to the mixing space. Gas warm air heater. 2. The gas hot air heater according to claim 1, wherein the front plate of the main body case defining the mixing space is inclined so as to protrude forward downward. 3. The gas hot air heater according to claim 2, wherein a stabilizer is formed at a lower extension of the front plate of the main body case. 4. The gas warm air heater according to claim 1, further comprising an air passage bypassing above the combustion case and an air passage bypassing below the combustion case. 5. The gas temperature according to claim 1, wherein a notch for replacing a thermocouple is formed in a guide wall extending upward in front of a front plate of the combustion case. Wind heater.