JPS644102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot air heater such as an open type oil hot air heater.

Structure of conventional example and its problems As shown in Figs. 1 and 2, a conventional hot air heater, for example, an open oil hot air heater, has a combustion cylinder part 2 in the upper part and a burner part 3 in the lower part in the main body case 1. A fan guard 4 is provided opposite the combustion cylinder section 2. The burner section 3 is attached to a stand 6 via a support stand 5, and a pump 7 and a fuel tank 8 for supplying fuel oil to the burner section 3 are provided in the outer peripheral space of the burner section 3. Therefore, with this configuration, the temperature of the pump 7, fuel tank 8, stand 6, etc. rises above safety standard values due to the heat generated by the burner section 3, which poses a problem in that the safety of the warm air heater is compromised. Ta. In addition, the temperature increase in the pump 7 causes a power drop in the pump 7, which reduces the amount of fuel supplied, resulting in a combustion mode with excess air, which poses a problem in that combustion stability is impaired.

As another example, as shown in FIG. 3, an opening 9 is provided in the main body case 1 to allow wind to naturally pass through and cool the outer circumferential space of the burner part 3.
The effect was not sufficient.

Purpose of the Invention The present invention was made in view of the above problems, and aims to improve the safety of the hot air heater by cooling the outer peripheral space of the burner part, and to maintain combustion stability. be.

Structure of the Invention In order to achieve the above object, the present invention communicates the suction port side of the fan with the outer circumferential space of the burner section, and the negative pressure of the fan generates an air circulation flow to cool the outer circumferential space of the burner section. It's summery.

DESCRIPTION OF EMBODIMENTS One embodiment will be described below with reference to FIGS. 4 to 7. In the figure, 11 is a box-shaped main body case, and a hot air outlet 12 is provided at the lower front surface. Reference numeral 13 denotes a stand attached to the lower part of the main body case 11, and 14 denotes a burner unit attached to the stand 13 via a support stand 15. In this embodiment, as shown in FIG. It consists of a burner case 17 surrounding the outer periphery of the vaporizing cylinder 16 and a burner head 18 attached to the upper part of the vaporizing cylinder 16. Secondary air for cooling is supplied into the burner case 17 through an air supply pipe 19. 20 is a pump that supplies fuel to the burner section 14, and 21 is a fuel tank that holds fuel sucked up by this pump 20. Reference numeral 22 denotes a combustion cylinder section mounted on the burner section 14, and a fan 23 is provided so as to face the combustion cylinder section 22. Reference numeral 24 denotes a hot air forming body installed on the flange portion 17a of the burner case 17, and the front opening is connected to the hot air outlet 1.
2, and the rear opening is connected to the main case 11.
It is connected to an opening 11a for a fan 23 provided on the back side of the fan 23, and forms a hot air passage 25. 26 is a fan guard that supports the fan 23;
It has an inlet 27. Reference numeral 28 denotes a duct provided at the lower part of the fan guard 26 on the suction port 27 side, and is attached to the main body case 11. An opening 29 is provided in the main body case 11 within this duct 28, and communicates the outer circumferential space of the burner section 14 with the suction port 27 side of the fan 23. An air intake port 30 is provided in the main body case 11 at a position opposite to this opening 29.

In the above configuration, the air supplied by the fan 23 is mixed with the exhaust gas generated from the burner section 14, heat exchanged with the air, and is blown out from the hot air outlet 12 as warm air.
At this time, since the duct 28 is provided on the suction port 27 side of the fan 23, the fan 23 is connected to the duct 28,
Burner portion 14 of main body case 11 through opening 29
It starts sucking the air around it. As a result, air flows around the outer periphery of the burner section 14, and the space around the outer periphery of the burner section is cooled. Therefore, the temperature of not only the burner section 14 but also the fuel tank 21, stand 13, etc. located in the outer space of the burner section 14 may exceed the safety standard value, which may impede safety, or the temperature of the pump 20 may rise. This eliminates the problem of power down, fuel flow rate decreasing, and combustion becoming unstable. In particular, in this embodiment, since the air intake port 30 is provided on the front surface of the main body case 11, external air is taken in from the air intake port 30 and flows through the outer circumferential space of the burner part, so the effect is great. .

In addition, an opening 29 is provided in the part of the main body case 11 facing the outer peripheral space of the burner part, and a duct 28 is provided between this opening 29 and the suction port side of the fan 23.
It is simple in terms of configuration because it is equipped with
It has the advantage of good productivity.

Effects of the Invention As described above, according to the present invention, since the suction port side of the fan is communicated with the outer circumferential space of the burner section, the outer circumferential space of the burner section can be cooled, and the safety of the hot air heater is improved. Combustion can be stabilized as it increases. In addition, it is only necessary to provide a duct between the bottom surface of the fan guard and the back of the main body, and to provide an opening on the back of the main body opposite to this duct, so there is no need to design the structure inside the heater main body into a special shape. Not only can it be provided easily and inexpensively, it can also reduce the temperature at the back of the main body at the bottom of the fan guard, where the temperature tends to rise as it is close to the burner, and it can also be covered with a duct to prevent it from being touched, making it safe. performance is further improved. Further, even if the suction port on the back side of the fan guard is blocked by, for example, making the back side of the fan guard close to a wall, air can be taken in through the duct, and abnormal situations can be prevented.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of conventional hot air heaters.
Figure 3 is a cross-sectional view of another conventional hot air heater;
5 is a sectional view of a warm air heater according to an embodiment of the present invention, FIG. 6 is an enlarged view of the main part thereof, and FIG. 7 is a view of the main part seen from the back side of the main body. 11...Body case, 14...Burner part, 20
... pump, 21 ... fuel tank, 22 ... combustion cylinder section, 23 ... fan, 25 ... hot air passage, 27
... Suction port, 28 ... Duct, 29 ... Opening, 3
0...Air intake.

Claims (1)

[Claims] 1. A main body having a hot air outlet, a burner section provided in the main body, a combustion tube section disposed above the burner section, a fan that blows air around the outer periphery of the combustion tube section, and a fan surrounding the combustion tube section. A hot air forming body communicating between the hot air outlet and the fan, and a fan guard attached to the back of the main body so as to cover the fan,
A hot air heater further comprising a duct that covers the suction port on the lower surface of the fan guard between the back surface of the main body and the lower surface of the fan guard, and an opening that communicates with the burner installation space on the back surface of the main body facing the duct.