JPH0517449U - Oil hot air heater - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent a fire or the like due to fuel leakage from the filler port of the filler tank when refueling with a simple configuration. [Structure] An air blower port 5 is provided on a back plate 3 of an outer case 1 having a built-in combustion part, and a fan guard 30 is attached to the back plate 3 so as to cover the air blower port 5 from the outside. The blower 4 arranged in 5 parts is held. The fan guard 30 has the upper surface portion 30A as a non-perforated portion, and the mounting flange 3 on the upper surface portion 30A side.
2 is fastened and fixed to the outer surface of the back plate 3 above the blower opening 5 by at least three fastening screws 34.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hot air heater such as an oil fan heater, and more particularly to an oil hot air heater that discharges warm air into a room by disposing a blower at a blower opening portion of a rear plate of an outer case.

[0002]

[Prior Art]

 Conventionally, a hot-air heater of this type is provided with a ventilation port on a back plate of an outer case having a built-in combustion part, and the ventilation port is provided on the outside, as disclosed in, for example, Japanese Patent Publication No. 3-19466. A fan guard is attached to the back plate so as to cover from above, and this fan guard holds the blower placed at the blower opening. In addition, a fuel tank for storing petroleum fuel such as kerosene is housed in the outer case, and a fuel tank for replenishing the petroleum fuel to the fuel tank is housed in the outer case so that it can be put in and out. ..

[0003]

[Problems to be solved by the device]

 In the conventional warm-air heater described above, when the fuel in the refueling tank becomes empty, the refueling tank is taken out of the outer case and stored again in the outer case after refueling.When refueling, for example, refueling the refueling tank. If the mouth cap is not tightened sufficiently, the fuel in the refueling tank will flow out from the refueling port of the refueling tank and will be scattered in large quantities on the upper surface of the outer case. It flows to the back plate side. Here, the fuel that has flowed to the rear plate side of the outer case enters the fan guard through the ventilation holes, especially on the upper surface of the fan guard, is sucked into the fan part, and passes through the blower opening together with the wind of the fan to the outer casing. There was a concern that it would enter the case and be ignited by the heat of the combustion section, causing the flame from this ignition to flow out from the hot air outlet, causing a fire.

Therefore, if the upper surface of the fan guard is made non-perforated, the petroleum fuel flowing to the back plate side will not be sucked into the fan part. However, in the conventional hot air heater, Since the mounting flange on the upper surface side was screwed to the back plate using two tightening screws that were largely separated from each other on the left and right, a gap was created between the back flange and the central part of the mounting flange. There was a problem that petroleum fuel would be sucked into the fan through this gap.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to prevent a fire or the like due to spilling of petroleum fuel from the filler opening of the refueling tank to the outer case at the time of refueling with a simple configuration. The purpose is to do so.

[0006]

[Means for Solving the Problems]

 In the present invention, a blower is provided on the back plate of the outer case that has a built-in combustion part, and a fan guard is attached to the back plate so as to cover the blower from the outside. In the oil hot air heater to be held, the fan guard has a non-perforated upper surface, and the mounting flange on the upper surface side has at least three fastening screws on the outer surface of the rear plate above the air outlet. It has a fixed structure.

Further, according to the present invention, a blower port is provided on the back plate of the outer case having a built-in combustion part, and a fan guard is attached to the back plate so as to cover the blower port from the outside. In an oil warm air heater that holds a blower arranged in a part, the fan guard has a non-perforated upper surface, and the mounting flange on the upper surface side has a recess on the outer surface of the rear plate above the air outlet. It is fixed in place.

[0008]

[Action]

 With this configuration, a large amount of petroleum fuel is scattered from the filler port to the upper surface of the outer case when refueling, etc., and even if a part of the fuel flows to the rear surface of the outer case, the upper surface of the fan guard has no holes. Therefore, it is not sucked into the fan part from this upper surface part and is not carried to the combustion part, and the mounting flange on the upper surface side of the fan guard is fastened and fixed so that there is no gap between it and the rear plate. It is also possible, and there is no concern that oil fuel will be sucked into the fan section between the mounting flange and the back plate.

Further, according to the second aspect of the present invention, the upper surface of the fan guard is a non-perforated part, and it is possible to prevent the petroleum fuel from flowing between the rear plate and the mounting flange on the upper surface side. Therefore, there is no concern that oil fuel will be sucked into the fan part.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes an outer case having a hot air outlet 2 on the front surface thereof, and a rear plate 3 of the outer case 1 is provided with a blower port 5 in which a blower 4 including a motor 4A and a propeller fan 4B is arranged. A fuel tank 6 for storing petroleum fuel such as kerosene is arranged on the lower right side inside the outer case 1, and a fuel tank 6 for supplying fuel to the fuel tank 6 is provided in the outer case 1 above the fuel tank 6. The tank 7 is accommodated. Reference numeral 8 denotes an entrance / exit of a fuel tank 7 which is opened in the top plate 9 of the outer case 1, and an opening / closing lid 10 is provided at the entrance / exit 8.

Reference numeral 11 denotes a vaporization burner having a combustion section 12 provided in the outer case 1 at the upper portion, 13 denotes a burner case provided at the outer circumference of the vaporization burner 11, and 14 covers the outer circumference of the combustion section 12 and opens at the upper portion. The tubular combustion tube 15 and the blower duct 15 have the combustion tube 14 facing the inside. The blower duct 15 connects the hot air outlet 2 and the blower port 5. Reference numeral 16 is a heat shield plate arranged between the combustion cylinder 14 and the blower duct 15, 17 is a burner blower for supplying combustion air to the vaporization burner 11, and 18 is fuel for supplying the fuel in the fuel tank 6 to the vaporization burner 11. It is a fuel pump.

Reference numeral 19 shown in FIG. 6 is a fuel filler cap fastened to the fuel filler metal fitting 20 of the fuel filler tank 7. This fuel filler cap 19 is inserted into a cup-shaped receiver 22 provided in the fuel tank 6. An opening / closing valve 25 that is pushed up by a protrusion 23 standing on the bottom surface of the receiving tool 22 to open the outlet 24 is provided.

Further, in the receiving member 22, an outlet 27 covered with a filter 26 is formed on the bottom, and a plurality of locking protrusions 28 projecting on the inner surface of the peripheral wall of the outlet 27 are provided on the filler cap. An annular packing 29 is attached to which the intermediate portion of 19 comes into liquid-tight contact, and the liquid-tight contact between the annular packing 29 and the filler cap 19 allows, for example, air in the refueling tank 7 refueled outdoors in cold weather. Can be prevented from overflowing to the upper part of the receiver 22 even if the fuel is suddenly pushed into the receiver 22 by the expanded air when the refueling tank 7 is set in the warm chamber.

The fuel pushed out of the refueling tank 7 by the expanded air overflows from the upper part of the receiver 22 because the filter 26 covering the outlet 27 of the receiver 22 serves as oil passage resistance. This is because if the meshes of 26 are roughened to reduce the oil passage resistance, the inconvenience of dust entering the fuel tank 6 occurs.

Reference numeral 30 denotes a box-shaped fan guard attached to the rear plate 3 so as to cover the blower port 5 from the outside of the outer case 1, and the motor 4 A of the blower 4 is fixedly held on the inner surface of the fan guard 30. As shown in FIGS. 1 and 2, the fan guard 30 has a non-perforated upper surface portion 30A and a large number of vent holes 31, 31 ... Also, mounting flanges 32 and 33 are integrally provided on the upper surface 30A side and the lower surface 30B side of the fan guard 30, respectively, and these mounting flanges 32 and 33 are brought into contact with the outer surface of the rear plate 3 to form a plurality of mounting flanges. It is fastened by tightening screws 34, 34. Here, the left and right edges of the mounting flange 33 on the lower surface portion 30B side are fixed to the rear plate 3 by the tightening screws 34, but the mounting flange 33 on the upper surface portion 30A side which is in the non-perforated state is left and right. An edge portion and a central portion located on a vertical imaginary line a passing through the center of the blower opening 5 are fixed by three tightening screws 34.

In the above structure, the petroleum fuel replenished from the fuel tank 7 to the fuel tank 6 is pumped up by the fuel pump 18 and sent to the vaporization premixing chamber of the vaporization burner 11, where it is vaporized and sent from the burner blower 17. The mixed gas is mixed with the generated air, and the mixed gas is ejected from the combustion section 12. The mixed gas ejected from the combustion section 12 is ignited by an igniter (not shown) and burns. This combustion gas is discharged from the upper part of the combustion cylinder 14 into the blower duct 15, where it is sent from the blower port 5 toward the warm air discharge port 2 by the rotation of the propeller fan 4B of the blower 4. It joins with the wind, becomes warm air, and is discharged into the room from the warm air outlet 2 for heating.

When the refueling tank 7 becomes empty, the refueling tank 7 is taken out of the outer case 1 for refueling, and after refueling, it is set in the outer case 1 again. During that time, if fuel remains in the fuel tank 6, combustion will continue without extinguishing the fire.

According to the present embodiment, since the upper surface portion 30A of the fan guard 30 attached to the rear plate 3 so as to cover the blower opening 5 from the outside is a non-perforated portion, the oil supply port cap 19 refuels at the time of refueling. When a large amount of fuel in the refueling tank 6 falls on the top plate 9 of the outer case 1 after coming off from the mouth metal fitting 20, a part of the fuel flows to the rear plate 3 side, and the upper surface of the fan guard 30 in the non-perforated state. After it spreads over 30A, it falls from the peripheral edge of the upper surface portion 30A, so that it is hardly sucked into the propeller fan 4B from the ventilation holes 31 formed in the vertical surface other than the upper surface portion 30A.

The mounting flange 32 on the side of the upper surface portion 30 A which is in a non-perforated state is attached to the rear plate 3 by using three tightening screws 34 located at the central portion of the mounting flange 32 and both left and right edges. Since it is fastened to the outer surface of the rear plate 3, the mounting flange 32 can be fixed to the rear plate 3 so that there is no gap between the rear plate 3 and the mounting flange 32 located above the air outlet 5. The fuel that has flowed to the back plate 3 side does not pass through between the mounting flange 32 and the back plate 3 and is not sucked into the propeller fan 4B portion.

Therefore, as in the conventional case, the fuel that has flowed to the rear plate 3 side of the outer case 1 is sucked into the propeller fan 4B portion and enters the outer case 1 through the blower port 5 together with the wind of the fan 4B. Such a situation can be prevented in advance, and the occurrence of a fire or the like due to the detachment of the filler cap 19 of the filler tank 7 can be achieved by simply adding a tightening screw without applying special processing to the fan guard. It can be prevented by a simple structure.

The number of fastening screws 34 for fastening the mounting flange 32 on the upper surface 30A side is not limited to three, and if three or more, the desired effect may be exhibited. it can.

FIG. 7 shows another embodiment of the present invention. In this embodiment, a recess 35 is provided in the back plate 3 above the air outlet 5 by pushing the seat, and the mounting flange 32 on the upper surface 30A side is tightened and fixed in the recess 35 by a tightening screw 34. In this case, the number of tightening screws 34 may be two.

In the above-mentioned embodiment, even if the fuel falls on the outer case 1, the upper surface 30A of the fan guard 30 is a non-perforated portion, and the fuel is the rear plate 3 and the mounting flange 32. Since it can be prevented from flowing in between, the fuel flowing to the back plate 3 side is not sucked into the propeller fan 4B portion.

[0024]

[Effect of the device]

 Since the present invention is configured as described above, a fan guard is provided with a non-hole portion and a tightening screw is provided to prevent a fire or the like from being caused by fuel leakage from the fuel inlet of the fuel tank when refueling. This can be prevented by a simple configuration such as a slight addition or a recess provided on the back plate, which can further improve safety while suppressing cost increase.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a mounted state of a fan guard in a warm air heater according to an embodiment of the present invention.

FIG. 2 is a sectional view of a mounting portion of the fan guard.

FIG. 3 is a front view in which a part of the warm air heater is also cut away.

FIG. 4 is also a vertical side view of the warm air heater.

FIG. 5 is a perspective view of the warm air heater in a state where a part of the refueling tank is pulled out, as seen from the rear.

FIG. 6 is a sectional view showing a state in which the filler cap is also inserted into the receiving tool.

FIG. 7 is a cross-sectional view of a mounting portion of a fan guard of a warm air heater according to another embodiment of the present invention.

[Explanation of symbols]

 1 Exterior Case 3 Back Plate 4 Blower 5 Blower Port 12 Combustion Section 30 Fan Guard 30A Top Surface of Fan Guard 32 Mounting Flange 34 Tightening Screw 35 Recess

Claims (2)

[Scope of utility model registration request] 1. An air blower is provided on a back plate of an outer case having a built-in combustion part, and a fan guard is attached to the back plate so as to cover the air blow port from the outside. In the oil hot air heater to be held, the fan guard has a non-perforated upper surface, and the mounting flange on the upper surface side has at least three tightening screws on the outer surface of the rear plate above the air outlet. An oil hot air heater characterized by being fastened and fixed. 2. An air blower is provided on a back plate of an outer case having a built-in combustion section, and a fan guard is attached to the back plate so as to cover the air blow port from the outside. In the oil hot air heater to be held, the fan guard has a non-perforated upper surface, and a mounting flange on the upper surface side is fixed to a recess on the outer surface of the rear plate above the air outlet. Oil hot air heater characterized by.