JP2003050055A - Warm-air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve a problem in a conventional warm-air heater that hot air, heated to a high temperature on the surface of a combustion tube 4, flows to the central part of a propeller fan 6 by the flow of air B flowing from a point of about 1/2 of the radius R of the propeller fan 6 to the inner peripheral side of the same from the fore part toward the rear part of the same whereby a temperature at the central part of the fan 6 is raised and, accordingly, a motor 7 for driving the ventilating propeller fan 6 is heated through a rotary shaft 7a and the temperature of the same is raised whereby lubricating oil in the driving motor 7 is dried up and the motor 7 is locked thereby becoming impossible to develop the original function of the heater. SOLUTION: In order to resolve the problem, the warm air heater comprises the ventilating propeller fan 6 arranged on the rear surface of the heater and the combustion tube 4 and a warm air diffuser arranged in front of the fan. A heat shielding plate 14, forming a double wall structure together with the tube 4 is provided between the propeller fan 6 and the combustion tube 4 at the rear surface side of the combustion tube 4 to reduce the temperature of the central part of the ventilating propeller fan 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air heater equipped with a propeller fan for blowing air.

[0002]

2. Description of the Related Art As a conventional hot air heater for sucking indoor air by a propeller fan for blowing air, mixing it with combustion gas generated by combustion in a combustor to generate hot air, and supplying the air to a room for heating. There is a warm air heater as shown in FIG. Figure 5
In the conventional warm air heater shown in FIG. 2, hot air generated by the flame 3 generated by the combustion of the combustor 2 provided in the lower portion of the combustion tube 4 is expanded upward by the combustion tube 4 and is rearward in the wind tunnel 5. The air is mixed with the cold air blown from the blower propeller fan 6 arranged and is discharged into the room from the warm air blowout port 8 in the front as appropriate hot air.

In the conventional hot-air heater having the above-mentioned structure, approximately 1/2 of the radius R of the propeller fan 6 on the outer peripheral side is
The original propeller fan 6 is characterized by a flow A that sends the air obliquely forward, and at approximately 1/2 of the inner radius side of the radius R, there is no wind or a flow B of wind that flows from the front to the rear. There is.

FIG. 7 shows the mounting structure of the propeller fan 6 and the drive motor 7. The propeller fan 6 is fixed to the rotary shaft 7a of the drive motor 7 by a fixing plate washer 11 and a vibration isolator. Rubber washer 12, fixing nut 1
It is fixed by 3.

[0005]

SUMMARY OF THE INVENTION In the conventional warm air heater as described above, the inner radius of the propeller fan 6 at the radius R is approximately 1 /.
2 is due to the wind flow B flowing from the front to the rear,
The hot air that has become hot on the surface of the combustion cylinder 4 flows to the central portion of the propeller fan 6, and the central portion temperature of the propeller fan 6 rises. As a result, the drive motor 7 driving the blower propeller fan 6 receives heat via the rotating shaft 7a, the temperature rises, and the lubricating oil in the drive motor 7 is exhausted. There was a problem that the original function could not be fulfilled, such as locking. Further, since the rubber washer 12 which is interposed for fixing the propeller fan 6 to the rotating shaft 7a is weak against heat, it is permanently deformed due to the passage of time under high temperature and the nut tightening and fixing become unstable, so that the propeller fan 6 is not fixed. There is a problem that it may cause dislodgement and vibration.

The present invention solves the above problems, and an object of the present invention is to reduce the temperature of the central portion of a blower propeller fan.

[0007]

The hot air heater according to the present invention comprises:
In order to achieve the above-mentioned object, a propeller fan for blowing air is arranged on the back side, and in the front of it, in a warm air heater in which a combustion tube and a hot air outlet are arranged, on the back side of the combustion tube, a propeller fan is installed. A heat shield plate having a double wall structure is provided between the combustion cylinder and the combustion cylinder.

Further, the heat shield plate has an area that covers at least about 1/2 of the inner radius side of the radius R of the propeller fan.

The lower surface of the heat shield plate is open, and its position is approximately 1 / outer side of the radius R of the propeller fan.
It is characterized by being located in the range of 2.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a vertical cross-sectional view of a warm air heater showing a first embodiment of the present invention,
FIG. 2 is a cross-sectional view of the warm air heater according to the first embodiment. 1 and 2, 1 is a main body case, 2 is a combustor, 3 is a combustion flame generated by combustion of the combustor 2, 4 is a combustion tube arranged to cover the combustion flame 3, 5 is a wind tunnel,
Reference numeral 6 denotes a propeller fan for blowing air, which sucks indoor air from the back surface of the main body case 1, mixes it with combustion gas generated by the combustion of the combustor 2 in the wind tunnel 5, and blows the air into the room from the front surface of the main body case 1. The drive motor, 8 is a hot air outlet arranged on the front surface of the main body case 1, 9 is a fan guard covering the outside of the propeller fan 6 for sending, and 10 is a large number of air intake ports provided in the fan guard 9. . Reference numeral 14 denotes a heat shield plate which is fixed so as to be arranged on the back surface of the combustion cylinder 4 and between the blower propeller fan 6. This heat shield 14
Has at least an area that covers substantially the entire inner circumference side of the radius R of the propeller fan 6 and is 2 at the back side of the combustion cylinder 4.
It has a heavy wall structure.

Next, the operation of the warm air heater having the above-described structure according to the first embodiment will be described. 1 and 2, the heat shield plate 14 fixed so as to be arranged on the back surface of the combustion cylinder 4 and between the blower propeller fan 6 is the combustion cylinder 4
Has a double wall structure, the surface temperature of the heat shield plate 14 is reduced, and there is no wind or a wind flowing from the front to the rear approximately half of the inner radius side of the radius R of the propeller fan 6. Even if the flow B is blowing, the temperature of the central portion of the propeller fan 6 is reduced. Further, since the area of the heat shield plate 14 is configured so as to cover substantially the entire area on the inner peripheral side of the radius R of the propeller fan 6, it does not draw hot air from the combustion cylinder 14 portion. . Therefore, as in the past,
The temperature is increased by receiving heat via the rotating shaft 7a that drives the blower propeller fan 6, and the lubricating oil in the drive motor 7 is not depleted, so that the lock of the drive motor 7 and the propeller fan 6 are prevented. Since the rubber washer 12 interposed for fixing to the rotating shaft 7a is not permanently deformed by heat, problems such as disengagement of the propeller fan 6 and large vibration can be solved. Further, since the heat shield plate 14 has an area that covers at least the entire area on the inner peripheral side of the radius R of the propeller fan 6, it is possible to more reliably reduce the temperature of the central portion of the propeller fan 6.

Embodiment 2. Next, a second embodiment of the present invention will be described with reference to the drawings. 3 is a vertical cross-sectional view of the warm air heater according to the second embodiment of the present invention.
[Fig. 6] is a perspective view showing a configuration of a combustion cylinder and a heat shield plate according to the second embodiment. 3 and 4, reference numeral 14 denotes a heat shield plate fixed so as to be arranged on the back surface of the combustion cylinder 4 and between the blower propeller fan 6 and the combustion cylinders 4 and 2 as in the first embodiment. It has a heavy wall structure and the lower surface is open. Further, the open lower surface thereof is arranged in a range of approximately 1/2 of the outer radius side of the radius R of the propeller fan 6, that is, in the flow A that sends air forward obliquely, which is the characteristic feature of the propeller fan 6. . According to the second embodiment, with the above configuration, the flow C of the air flowing upward in the double wall structure is formed, so that the surface temperature of the heat shield plate 14 is lower than that of the first embodiment. Therefore, the temperature rise of the motor shaft 7a driving the propeller fan 6 can be further reduced.

[0013]

As described above, according to the first aspect of the present invention.
According to the authors, by providing a heat shield plate on the back of the combustion cylinder and between the propeller fan for sending and the propeller fan for sending, the temperature of the central part of the propeller fan is reduced, and the propeller fan for blowing is driven as in the conventional case. The temperature rises when it receives heat via the rotating shaft, which eliminates problems such as exhaustion of lubricating oil in the motor, and the rubber washer that is used to lock the drive motor and fix the propeller fan to the rotating shaft. Since it will not be permanently deformed by heat, problems such as disengagement and vibration of the propeller fan can be solved.

According to a second aspect of the present invention, the heat shield plate is at least 1 / inner side of the radius R of the propeller fan on the inner peripheral side.
Since it has an area that covers 2, the temperature of the central portion of the propeller fan can be reduced more reliably.

Further, according to claim 3 of the present invention, the lower surface of the heat shield plate is open, and the position thereof is located within a range of about 1/2 of the outer radius of the radius R of the propeller fan.
Since the cool air passes through the double wall structure, the surface temperature thereof is further reduced, and as a result, the temperature of the rotating shaft portion of the propeller fan can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a warm air heater showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the warm air heater showing the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a warm air heater showing a second embodiment of the present invention.

[Fig. 4] Fig. 4 is a perspective view showing a combustion cylinder and a heat shield plate of a hot air heater according to a second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a conventional warm air heater.

FIG. 6 is a view showing a mounting structure of a blower propeller fan and a drive motor of a conventional warm air heater.

[Explanation of symbols]

4 combustion cylinders, 6 propeller fans, 7 drive motors,
7a rotating shaft, 8 hot air outlet, 14 heat shield, A,
B, C Air flow.

Claims (3)

[Claims] 1. A propeller fan for blowing air is arranged on the back,
In a warm air heater in which a combustion cylinder and a hot air outlet are arranged in front of the combustion cylinder, a heat shield plate having a double wall structure is provided on the back side of the combustion cylinder between the combustion cylinder and the propeller fan. A hot air heater characterized in that. 2. The warm air heater according to claim 1, wherein the heat shield plate has an area that covers at least approximately 1/2 of the inner radius side of the radius R of the propeller fan. 3. The warm-air heating according to claim 1, wherein the lower surface of the heat shield plate is open, and the position thereof is located within a range of approximately 1/2 of the outer radius of the radius R of the propeller fan. Machine.