JPS6142029Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved open combustion hot air heater.

Conventionally, this type of device has kept the combustion chamber in a nearly hermetically sealed state so that the convection air flow and blowing air from the fan do not affect the combustion burner. For this reason, the part for checking combustion has a complicated shape and is expensive due to requirements such as shielding from the outside and heat resistance.

In order to eliminate the drawbacks of the conventional example, the present invention provides a combustion chamber with multiple small holes for combustion confirmation on the front surface of the combustion tube, which has a negative pressure inside due to convection air. To provide an open combustion type hot air heater in which a burner is not affected by convective airflow and head wind, and the structure of a part for checking combustion is simple and inexpensive. Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
1 is the appliance body, 2 is the fan, 3 is the ventilation guide, 4
5 is a heat shielding case, 5 is a hot air outlet, and 6 is a combustion burner. In the part forming the exhaust outlet 8 of the combustion tube 7, a height difference of h is provided between the front plate 9 and the rear plate 10 so that the convection air flow does not enter the inside of the combustion tube 7. The combustion cylinder 7 is shaped so that the internal pressure becomes negative due to the flow. In addition, a plurality of small holes A for supplying secondary air are provided on the bottom surface of the combustion tube 7, and a plurality of small holes B for combustion confirmation are provided on the front surface as shown in FIG. . here,
The total area of the small holes A for supplying secondary air is larger than the total area of the small holes B for checking combustion.

Next, the operation of this embodiment configured as above will be explained. First, the inside of the combustion tube 7 becomes negative pressure due to the convection air flow 11, so the secondary air 12 flows into the combustion tube 7 through the small holes A and B. Then, combustion gas 13 generated by combustion of gas in the combustion burner 6
is mixed with convection air 11 at the exhaust outlet 8 to become hot air 14, which is blown out from the hot air outlet 5. On the other hand, the state of combustion in the combustion burner 6 can be seen from the outside through the small hole B. Here, the total area of the small hole B is smaller than the total area of the small hole A, and in order to prevent the secondary air 12 entering from the small hole B from affecting the combustion burner 6, the small hole B is closed off with a cover, etc. Even without it, combustion in the combustion burner 6 is stable. Also, the front plate 9
Since there is a height difference h between the rear plate 10 and the rear plate 10,
The combustion burner 6 is not affected by the convective air flow 11 or the blowing air. Furthermore, if the hot air 14 were to flow into the combustion tube 7 from the exhaust outlet 8, the flame would be fanned by the head wind and tend to overflow from the small holes A and B. At this time, if the area of the small hole B is larger than the area of the small hole A, the flame will overflow from the small hole B where the resistance is low and will come out of the appliance through the hot air outlet, creating a dangerous situation. According to the present invention, since the total area of small hole B is smaller than the total area of small hole A, the flame overflows from small hole A. In this case, safety is ensured because the flame does not escape outside the device.

As explained above, according to the present invention, combustion is stabilized because the combustion burner is not affected by convection air or blowing air, and the structure of the part for checking combustion is simple and inexpensive. There are no advantages.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a perspective view of the combustion tube of the embodiment shown in FIG. 1. 1... Main body of open combustion hot air heater, 7... Combustion tube, 8... Exhaust outlet, 9... Front plate, 10... Rear plate, 11... Convection air flow, A, B... Small Hole.

Claims (1)

[Scope of utility model registration request] In an open combustion hot air heater having a combustion tube, the upstream side of the convection air flow is higher than the downstream side of the part forming the exhaust outlet of the combustion tube, and a plurality of small holes are formed in the lower surface of the combustion tube. an open combustion hot air heater, characterized in that a plurality of small holes for combustion confirmation are provided on the front surface of the combustion tube so that the total area of the holes is smaller than the total area of the small holes provided on the bottom surface. .