JPH0547762Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a road snow melting device that is applied to roads in cold regions.

Conventional technology As a snow melting device for roads in cold regions, the conventional snow melting device for roads in cold regions is a pavement version snow melting device (actual) in which a large number of pipes are buried at regular intervals in the pavement, and a gas nozzle pipe connected to a gas supply pipe is arranged in the combustion chamber. (Refer to Publication No. 48-5222), a snow melting device that heats the covering plate by placing a gas burner on a support base in a groove in the road and covering the top with a heat conductive cover plate (Refer to Publication No. 48-5223) There is.

However, in the conventional technology described above, flame is formed in the gas nozzle pipe and the gas outlet of the gas burner, and with this structure, in order to heat a wide area, it is necessary to provide a large number of gas outlets. However, there are problems such as the part where the gas flame is formed is always at a high temperature and it is difficult to heat the entire part evenly.
Improvement was strongly requested.

Therefore, this idea has been developed by arranging many snow melting units consisting of propagation combustors and exhaust pipes in which flame moves in pipes under the road surface, and using the combustion heat of fuel gas (mixture) and exhaust heat to cover a wide area of the road surface. It is an object of the present invention to provide a road snow melting device that heats the snow evenly over the entire area, significantly improves snow melting efficiency, and reduces maintenance costs.

Means for Solving the Problem This invention provides a gas nozzle 3 in the pressure chamber 2 at one end of the combustion tube 1, a narrowed through hole 7 at the boundary with the pressure chamber, and an ignition heater 5 in the chamber chamber 4 at the other end. The above objective has been achieved by adopting a technical means of burying a plurality of snow melting units B, each consisting of a propagation combustor A and an exhaust pipe 6 connected to the chamber chamber 4 of the propagation combustor A, under the road surface C. .

Function Since this device has the above-mentioned configuration, in the combustion tube 1, fuel gas is supplied → ignition → propagation combustion → extinguishing →
The combustion heat from the propagation combustor A and the exhaust pipe 6 whose flame front is transmitted under the cycle of exhaust gas exhaust
The exhaust heat of the combustion exhaust gas flowing through the vehicle is effectively utilized to efficiently and uniformly heat a wide area of the road surface C to melt snow.

Embodiments Hereinafter, embodiments of this invention will be described based on the drawings. In FIGS. 1 and 2, A is a propagation combustor in which a gas nozzle 3 is directed toward the center of the combustion tube 1 in a pressure chamber 2 provided by expanding the diameter of one end (upstream side) of a straight tube-shaped combustion tube 1. A chamber chamber 4 provided in communication with the other end (downstream side) of the combustion tube 1 is provided with an ignition heater 5, and a boundary portion between the pressure chamber 2 and the combustion tube 1 is provided. A narrow passage hole 7 is bored in the pressure chamber 2, and an air supply pipe 8 is connected to the pressure chamber 2.
6 is an exhaust pipe, which is connected to the chamber chamber 4 of the propagation combustor A.
The base end is connected to the combustion tube 1, and the tip thereof is provided with an exhaust port 6a, and the planar shape is bent into a U-shape, so that the positional relationship between the combustion tube 1 and the exhaust pipe 6 is adjusted so that the combustion heat from the combustion tube 1 and the exhaust gas are controlled. The setting is such that each part on the road surface C is heated equally by the exhaust heat from the pipe 6.
B is a snow melting unit that includes the heat transfer combustor A and its exhaust pipe 6, and multiple sets of snow melting units B are placed below the road surface C at appropriate intervals in consideration of equalization of the heating. They are buried in parallel. At this time, the air supply pipe 8, the air supply port 8a, and the exhaust port 6a of the exhaust pipe 6 are opened to protrude from both side edges of the road surface C. In addition, 9 is a heat insulating material, and when the lower part of the combustion tube 1, chamber chamber 4, and exhaust pipe 6 is covered with the heat insulating material,
All of the combustion heat from the combustion tube 1 and the exhaust heat from the exhaust pipe 6 are conducted to the road surface C (above), increasing the heat transfer efficiency.

In the embodiments shown in FIGS. 1 and 2, by setting the positional relationship between the combustion tube 1 and the U-shaped exhaust pipe 6, the road surface temperature is averaged by heat transfer to the road surface C. In the embodiments shown in FIGS. 3 and 4, the fins 10 are used to average the values. That is, the combustion tube 1 and chamber chamber 4, which emit high-temperature combustion heat, are provided with fins 10 coarsely, and the exhaust pipe 6, which emit low-temperature exhaust heat, is provided with fins 10 more densely, extending from the base end to the tip end. Accordingly, the intervals are gradually narrowed in order to average the road surface temperature through heat transfer. It is preferable that the fins 10 be provided only on the upper surfaces of the combustion tube 1, the chamber chamber 4, the exhaust pipe 6, etc. so that the heat can be radiated toward the road surface C.

In the above configuration, the propagation combustor A performs propagation combustion by repeating a cycle of supplying combustion gas → ignition → propagation combustion → extinguishing and discharging exhaust gas at a rate of about once every 5 to 6 seconds, for example. That is, a mixture of gas from the gas nozzle 3 and air from the air supply pipe 8 flows from the pressure chamber 2 through the narrow passage hole 7 into the combustion tube 1.
The flow speed is increased to the downstream side (to the right) as it is forcefully supplied inside.
The mixture flows at V ₁ (see arrow a in FIG. 3 and FIG. 5), and when the air-fuel mixture reaches the chamber chamber 4, it is ignited by the ignition heater 5. When ignited, the combustion velocity V ₂ is faster than the flow velocity V ₁ of the fuel gas, so the flame flow moves inside the combustion tube 1 on the upstream side (left side) (Fig. 1, arrow b in Fig. 3, and arrow b in Fig. 5). When the flame reaches the narrowed passage hole 7, it is dammed up and reliably extinguished by the sudden change in the flow velocity, and after extinguishing, the flame is burned again. Gas is supplied, and the combustion exhaust gas in the combustion cylinder is released to the atmosphere from the exhaust pipe 6. When the fuel gas reaches the chamber chamber, it is ignited and the next propagation combustion operation begins. Therefore, in the combustion cylinder 1 of the propagation combustor A, combustion heat due to propagation combustion is transmitted through the flame front through the cycle of fuel gas supply → ignition → propagation combustion → extinguishing, and exhaust gas discharge, and the combustion heat generated by the propagation combustion. The exhaust heat from the combustion exhaust gas is evenly transferred to a wide range of road surfaces C to melt the snow accumulating on the road surfaces C.

Furthermore, if the lower surfaces of the combustion tube 1, exhaust pipe 6, etc. of the propagation combustor A are covered with a heat insulating material 9 to prevent combustion heat and exhaust heat from escaping to areas other than onto the road surface C, the efficiency will be further increased. If the fins 10 are provided on the combustion tube 1, the exhaust pipe 6, etc., the heat transfer efficiency will be further improved.

Effects of the invention As explained above, this invention consists of a propagation combustor A that uses a gas self-combustion cycle and its exhaust pipe 6.
Since a plurality of snow melting units B consisting of After the flame is extinguished, the exhaust gas flows from the combustion tube 1 to the exhaust pipe 6, and the exhaust heat is transferred to the combustion tube and around the exhaust pipe, and the heat can be evenly transferred to a wide range of road surfaces, reducing snow accumulation on the road surface. Snow can be melted efficiently, and with improved snow melting efficiency, fuel consumption can be reduced and maintenance costs can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of an installed state of one embodiment of this invention, Fig. 2 is a front view of the same, Fig. 3 is a cross-sectional plan view of only the snow melting unit of a different embodiment, and Fig. 4 is a cross-sectional plan view of the snow melting unit of a different embodiment.
The figure is a partially enlarged sectional view, and FIG. 5 is an explanatory diagram of fuel gas supply, flame propagation combustion, and exhaust gas exhaust. 1... Combustion tube, 2... Pressure chamber, 3... Gas nozzle, 4... Chamber chamber, 5... Ignition heater, A
...Propagation combustor, 6...Exhaust pipe, B...Snow melting unit, C...Road surface, 7...Narrowed through hole.

Claims (1)

[Scope of utility model registration request] A propagation combustor A is provided with a gas nozzle 3 in the pressure chamber 2 at one end of the combustion tube 1, a narrow passage hole 7 at the boundary with the pressure chamber, and an ignition heater 5 in the chamber chamber 4 at the other end. Exhaust pipe 6 connected to chamber chamber 4
A snow melting device for a road, characterized in that a plurality of snow melting units B consisting of the following are buried under a road surface C.