JPS605060Y2 - Gas heater for road surface heating - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a road surface heating gas heater that heats an asphalt road surface.

When paving roads with asphalt, the asphalt surface is heated with a heater in order to connect the asphalt joints continuously and firmly, or to peel off the old asphalt road surface. .

Conventionally, as a heater for this purpose, for example,
The one described in Japanese Patent No. 3228 is known.

That is, as shown in FIG. 1, on the bottom surface of a rectangular inverted dish-shaped vessel body 2 with a flow guide plate 1 installed at its longitudinal end, a combustion net 3 and an outer layer are formed by stacking fine stainless steel wire mesh in multiple layers. Attach the net 4, match the hole to the upper surface of the perforated cover plate 5, attach the fuel gas supply pipe 6 so that one end of the skeleton 6 opens to the lower surface of the cover plate 5, and attach the hollow mountain-shaped reservoir plate 7 to the cover plate. A flow guide plate 9 is attached to the lower surface of the plate 5, and a flow guide plate 9 is attached to the reservoir plate 7 below a through hole 8 made therein. Attached removably, fuel gas supply pipe 6
At the other end, a nozzle 11 is attached and an air hole is opened, and a control plate 12 formed in a cross-sectional shape is attached to the inner surface of the upper part of the vessel 2 so that its position in the longitudinal direction of the vessel can be freely adjusted.

When used for road surface heating, when fuel gas is ejected from the nozzle 11, the gas passes through the fuel gas supply pipe 6 and exits through the through hole 8 of the reservoir plate 7 while sucking air from the air hole on the side of the nozzle. The water flows out onto the flow guide plate 9 and flows slightly downward in the longitudinal direction of the vessel body 2.

This gas flow hits the control plate 12 and its direction of flow is bent downward.

Therefore, when the vessel body 2 is long, the position of the control plate 12 is moved to the longitudinal end, and when the vessel body 2 is short, the position of the control plate is moved towards the flow guide plate 9. The flow direction of the air can be adjusted according to the length of the vessel body 2, and together with some of the gas flowing out from the side of the flow guide plate 9, the air mixture gas is distributed evenly within the vessel body, and the air mixture gas flows out from the combustion net 3 and is combusted. Thus, the lower part of the vessel body 2 can be heated evenly.

However, in the road surface heating gas heater constructed and used as described above, the fuel gas sent into the vessel body 2 through the fuel gas supply pipe 6 is distributed uniformly over the entire surface of the combustion network 3. Since the structure for making it spread over the area was complicated, manufacturing was troublesome and caused the cost of the product to be high.

The present invention aims to eliminate such inconveniences and provide a gas heater for road surface heating that has a simple structure and can uniformize fuel gas well.

Hereinafter, the present invention will be explained with reference to drawings showing embodiments.

FIG. 2 shows the overall structure of an embodiment of the present invention.

A rectifying plate 14, a combustion net 15, and an outer net 16 are arranged in order from the top at the lower opening of the container body 13, which is shaped like an upside-down rectangular deep dish.

In the illustrated embodiment, the current plate 14, the combustion net 15, and the outer net 16
The outer peripheral edge of the container body 1 is fixed by a fixed frame 17 having a U-shaped cross section.
It is attached to the lower surface of a flange 13a formed at the lower end of 3.

As shown in FIG. 3, the current plate 14 is a stainless steel plate with a large number of small holes drilled therein.

The thickness of the plate and the size or number of small holes are determined appropriately depending on the size of the container body 13 and the pressure of the fuel gas to be supplied.
It is practically effective to drill about 40 small holes per square inch.

On the other hand, one end of the fuel gas supply pipe 6 is connected to the upper surface of the end of the vessel body 13, and the upper and lower surfaces of the vessel body 13 located at the lower end of the supply pipe 6 are connected as shown in FIGS. As shown in FIGS. 4 and 5, a tunnel-shaped flow guide plate 18 whose cross-sectional area gradually increases from the opening of the supply pipe 6 toward the center of the container body 13 is fixed.

A reservoir plate 19 having a width approximately equal to the width of the flow guide plate 18 is provided near the opening of the flow guide plate 18 near the center of the vessel body.

The air accumulation plate 19 is constructed by fixing the bent portion 19'a at the upper end to the upper lower surface of the container body 2, and fixing both ends of the stay 20 fixed to the lower end to the inner surface of the container body 2. It is fixedly installed in the container body 2 a little distance from the central opening of the plate 18.

Further, a slight gap is provided between the lower edge of the air accumulation plate 19 and the upper surface of the rectifying plate 14, so that fuel gas can flow through the gap.

Next, the operation of the road surface heating gas heater of the present invention constructed as described above will be explained.

When fuel gas is fed into the vessel body 13 from the fuel gas supply pipe 6, the gas enters the flow guide plate 18, and most of the gas flows toward the center of the vessel body 13 along the upper surface of the flow guide plate 18. flow 1
, collides with the accumulation plate 19.

A portion of the fuel gas that collides with the accumulation plate 19 passes through both sides and the bottom of the plate 19 and flows into the right side of the vessel body 2, and the remaining portion changes its flow direction by approximately 180 degrees. It flows into the left half of the vessel body 2.

Also, a part of the fuel gas that has entered the flow guide plate 18 from the fuel gas supply pipe 6 flows into the left end of the vessel body 2 from the left end opening of the plate 18, so that the fuel gas at the left end becomes diluted. replenish.

The fuel gas that has flown almost uniformly throughout the vessel body 2 from the fuel gas supply pipe 6 in this way then passes through the baffle plate 14 and reaches the upper surface of the combustion net 15; At this time, the distribution of the fuel gas is made uniform throughout the container body 2.

Therefore, the combustion in the combustion net 15 becomes uniform over the entire surface, and the combustion temperature does not differ locally.

The road surface heating gas heater of the present invention is configured and operates as described above, so it has practical effects such as achieving uniform combustion of fuel gas with a simple configuration and providing a high-performance heater at a low cost. Thick.

If the nozzle 11 is installed at the end of the fuel gas supply pipe 6 as shown in FIGS. This has the auxiliary effect of improving the distribution of the fuel gas injected into the gas supply pipe 6.

That is, a plurality of vertical walls 2 extend around the nozzle 11 in the length direction.
1 and 21 and fixed to the end of the fuel gas supply pipe 6 with the outer peripheral surface of the vertical wall 21 and 21 in contact with the inner peripheral surface of the fuel gas supply pipe 6.

Therefore, the wind blowing obliquely to the opening at the end of the supply pipe 6 also flows along the vertical walls 21, 21 and becomes a flow in the length direction of the supply pipe 6, so that the gas distribution within the supply pipe 6 becomes uniform.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of a gas heater for road surface heating according to an earlier invention, Fig. 2 and the following show embodiments of the invention, Fig. 2 is a longitudinal sectional side view similar to Fig. 1, and Fig. 3 is a rectifying gas heater. FIG. 4 is a partially enlarged plan view of the plate, FIG. 4 is a sectional view taken along the line A-A in FIG. 2, FIG. 5 is a perspective view showing the flow guide plate and the reservoir plate, and FIG. 7 are end views of the nozzle. 11: Nozzle, 13: Vessel body, 14: Straightening plate, 5: Combustion network, accumulation plate. 16: Outer mesh, 18: Current guide plate, 19:

Claims (1)

[Scope of utility model registration request] A fuel gas supply pipe 6 is installed on the upper surface of the end of the rectangular inverted dish-shaped vessel 13.
A container body 13 connected to one end and located below the supply pipe 6
A tunnel-shaped flow guide plate 18 whose cross-sectional area gradually increases toward the center is fixed to the upper lower surface, and a portion of the flow guide plate 18 in the vessel body 13 that is a little far from the central opening is filled with accumulated air. The plate 19 is fixed with a gap provided between both side edges of the plate 19 and the inner surface of the vessel body 13, and the opening of the vessel body 13 is a rectifier with a large number of small holes drilled in order from the top. plate 14 and combustion net 16
and the outer net 16 are laid out with a space between them,
The gas heater for road surface heating operates with a slight distance between the upper surface of the rectifying plate 14 and the lower end of the accumulated air plate 19.