JP4042835B2 - Point snow melting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a point snow melting device capable of supplying hot air to a point of a track through a duct.
[0002]
[Prior art]
In winter, it is indispensable to heat the point part of the track to prevent freezing and to melt the snow accumulated in that part. For this reason, a point snow melting device is used that melts snow by supplying warm air to the point portion. An example of a snow melting system 92 using this point snow melting device is shown in FIGS. The point snow melting device 90 is arranged on the side of the track 60, and can guide the warm air to the point portion 60 of the track through the duct 40 connected to the outlet 12. An end (exit) 40 a on the line side of the duct 40 is sandwiched between two moving Tonglerel 45 that moves the point part 60 of the line and opens upward, and the opening moves together with the Tongleil 45. The cover plate 44 is covered. For this reason, the warm air 73 supplied from the point snow melting device 90 is blown from the cover plate 44 in the direction of the tongrel 45 and the rail 46, and always warms the point portion. Therefore, the hot air 73 supplied from the point snow melting device 90 through the duct 40 prevents the point portion 60 from freezing, and even if snow 80 accumulates on this portion, it is melted.
[0003]
The point snow melting device 90 is housed in a semi-underground substantially rectangular box 50, can take in outside air 70 from above, and can supply hot air 73 to the point portion 60 through a duct 40 buried under the track.
[0004]
A point snow melting device 90 shown in FIG. 3 includes a cylindrical housing 11 having an outlet 12 that can be connected to a duct 40, and a hollow that is disposed substantially coaxially inside the housing 11 and discharges combustion gas. A cylindrical combustion chamber 20, a burner 22 for supplying fuel into the combustion chamber 20, and a blower fan 30 for introducing outside air 70 from the rear of the housing 11 are provided. A part of the outside air 70 introduced by the blower fan 30 is supplied as combustion air 71. The other outside air 70 passes between the housing 11 and the combustion chamber 20, is mixed with the combustion gas 72, and is generated in large quantities as air (hot air) 73 having an appropriate temperature. The warm air 73 is sent into the duct 40 on the front side.
[0005]
[Problems to be solved by the invention]
In such a snow melting system using warm air, the point portion can be always heated.
For this reason, even in winter, the points do not get stuck due to freezing or snow, which is useful for ensuring the safety of the train.
[0006]
However, when a situation occurs in which the entire point is buried in snow due to a large amount of snowfall, snow melting efficiency may decrease. That is, in the point snow melting device 90 as shown in FIG. 3, the outside air 70 is introduced by the blower fan 30 disposed behind the housing 11 and necessary combustion air is supplied in the combustion chamber 20. Therefore, the snow 80 accumulates and the resistance of the outlet 40a of the duct 40 increases, which may reduce the flow rate of the blower fan 30. If the air volume of the blower fan 30 decreases, the air 71 necessary for the combustion supplied to the combustion chamber 20 is insufficient without introducing the outside air 70, and thus incomplete combustion occurs. As a result, soot and carbon monoxide are likely to be generated. Furthermore, heat output is also reduced due to incomplete combustion.
[0007]
Accordingly, when there is a lot of snowfall and the exhaust pressure rises, a desired air volume cannot be obtained from the point snow melting device, and the temperature also decreases. Further, soot generated by incomplete combustion adheres to a burner, a combustion chamber or the like of a point snow melting device, or a point portion of a duct or a track. For this reason, the subsequent maintenance is difficult, which may cause a failure or shorten the life of the apparatus. In addition, when the generated soot is heated, it becomes a spark, and this spark is emitted from the outlet to the outside, which may cause a fire.
[0008]
Accordingly, an object of the present invention is to provide an easy-to-use point snow melting device that can supply hot air with a desired heat output under a wide range of conditions.
[0009]
[Means for Solving the Problems]
For this reason, in the present invention, in addition to the first blower for introducing the outside air into the combustion chamber provided inside the housing, the outside air introduced by the first blower is pressurized so that the combustion air is supplied to the combustion chamber. A second blower that can be supplied to the combustion chamber is provided so that stable combustion can be maintained in the combustion chamber even when the exhaust pressure of the connected ducts increases.
[0010]
That is, the point snow melting device of the present invention includes a cylindrical housing whose front end can be connected to a duct, a cylindrical combustion chamber disposed inside the housing and capable of discharging combustion gas forward, and a combustion chamber. A burner that supplies fuel and a first blower that introduces outside air into the housing from the rear of the combustion chamber, and a temperature at which the outside air that has passed between the housing and the combustion chamber is mixed with the combustion gas. It is a point snow melting device capable of supplying wind to a heating target through a duct, and further includes a second blower that can pressurize the outside air introduced by the first blower and supply it to the combustion chamber. .
[0011]
In the point snow melting device of the present invention, the outlet pressure of the second blower for supplying combustion air to the outside air introduced from the first blower is relatively high. For this reason, when the exhaust pressure in the connected duct is increased and the intake amount of the outside air by the first blower is reduced, the outside air is prevented from flowing outside the combustion chamber with low pressure loss, It can mainly be supplied into the combustion chamber. Therefore, even when the duct outlet is clogged or the pressure loss in the duct increases due to the arrangement of the duct, sufficient air for combustion is ensured and stable combustion can be maintained. For this reason, combustion can be performed at any time or in a state close to that, and generation of soot and carbon monoxide can be prevented. In addition, troubles such as failure and deterioration due to defects can be prevented.
[0012]
In the present invention, even if the pressure related to the duct fluctuates, a stable combustion state can be maintained, so that a decrease in heat output can also be prevented. Therefore, when the point snow melting device of the present invention is employed in a snow melting system at the point portion of the track, the outlet (base end) of the duct is blocked by snow, the exhaust pressure becomes high, and the air flow rate decreases. Wind temperature rises. For this reason, snow melting is promoted and snow melting efficiency can be increased. In addition, even in such a state, the occurrence of wrinkles is small, so that maintenance is easy.
[0013]
As described above, according to the present invention, it is possible to supply hot air with a desired heat output under a wide range of conditions, and to provide an easy-to-use point snow melting device.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of a point snow melting device according to the present invention. As shown in FIG. 2, the point snow melting device 10 of the present example supplies warm air to the point 60 of the track through the duct 40 to heat and melt snow and ice.
[0015]
The point snow melting device 10 of this example has a cylindrical housing 11, and a ring-shaped outlet 12 to which a duct 40 can be connected is formed at the front end 11 a. Inside the housing 11, a cylindrical combustion chamber 20 that discharges combustion gas 72 is disposed substantially coaxially. A burner 22 that supplies fuel to the combustion chamber 20 and a blower (second blower) 28 that supplies combustion air 71 are provided at the rear end of the combustion chamber 20. Further, a blower fan (first blower) 30 for introducing outside air 70 into the housing 11 is provided at the rear end of the housing 11 at the rear of the combustion chamber 20. The point snow melting device 10 of this example employs a mixed flow type blower fan 30, and the rear 11 b of the housing 11 is widened to accommodate the motor 31 and the vane 32.
[0016]
In the point snow melting device 10 of this example, a part of the outside air 70 introduced by the blower fan 30 passes through the gap 13 between the housing 11 and the combustion chamber 20 and is supplied forward. Further, a part of the introduced outside air 70 is further pressurized by the blower 28 and sent into the combustion chamber 20 to become combustion air 71. Combustion gas 72 generated in the combustion chamber 20 is discharged forward and mixed with the outside air 70 that has passed through the outside of the combustion chamber on the front end 11 a side of the housing 11 to become hot air 73, and is sent from the outlet 12 to the duct 40. Supplied.
[0017]
Thus, in the point snow melting apparatus 10 of this example, since the blower 28 is provided, the outlet pressure of the blower 28 that supplies the combustion air 71 to the outside air 70 introduced from the blower fan 30 is relative. To be high. For this reason, when the exhaust pressure in the connected duct 40 increases and the intake amount of the outside air 70 by the blower fan 30 decreases, the outside air 70 flows through the gap 13 outside the combustion chamber 20 where the pressure loss is low. And can be mainly supplied into the combustion chamber 20. Therefore, in the point snow melting device 10, even when the outlet 40 a of the duct 40 is clogged or the pressure loss in the duct increases due to the arrangement of the duct 40, sufficient air 71 for combustion is secured by the blower 28 and stable combustion is performed. Can be maintained.
[0018]
In FIG. 2, the outline | summary of the snow melting system 5 for the point of the track | line comprised using the point snow melting apparatus 10 of this example is shown. The snow melting system 5 of this example has substantially the same configuration as the snow melting system 92 shown in FIGS. For this reason, the same code | symbol is attached | subjected about the common part.
[0019]
In the snow melting system 5 of the present example, the point snow melting device 10 is housed in a substantially rectangular hut 51, arranged at an appropriate distance from the point portion 60 of the track, and pointed through a duct 40 embedded under the track. Hot air 73 can be supplied to the portion 60. A louver 52 is formed on the side surface of the hut 51 in which the point snow melting device 10 is stored so that the outside air 70 can be taken in. Therefore, the outside air 70 taken in from the louver 52 is heated and blown out to the point portion 60 of the track, so that the point portion 60 of the track is protected from freezing and snow can be melted when the snow 80 accumulates.
[0020]
However, in the snow melting system 5, if the amount of snowfall is large, the outlet 40 a of the duct 40 may be covered with the snow 80. Then, since a predetermined amount of warm air cannot be supplied from the outlet 40a, the exhaust pressure in the duct 40 is increased, and the amount of air blown by the blower fan 30 is reduced. Even in this case, since the blower 28 is provided in the housing 11 in the point snow melting device 10 of this example, the air 71 introduced into the housing 11 is pressurized and a sufficient amount of air 71 necessary for combustion is obtained. Can be supplied to the combustion chamber 20. Therefore, in the combustion chamber 20, stable combustion can be maintained and heat output is easily maintained. For this reason, when the snow 80 accumulates, the air volume of the hot air 73 supplied to the point portion 60 is reduced, but the temperature of the supplied hot air 73 tends to increase. Therefore, the snow 80 at the outlet 40a of the duct 40 can be melted, the performance can be prevented from being significantly lowered, and the normal operation state can be restored. For this reason, the snow melting efficiency of the point portion 60 of this track can be increased, and a system capable of exhibiting sufficient ability even in a snowfall amount is obtained. Furthermore, generation of wrinkles can be prevented, and a user-friendly system can be configured.
[0021]
Thus, in the point snow melting device 10 of this example, even if the snow 80 is piled up and the resistance of the outlet 40a of the duct 40 is increased, and the flow rate of the blower fan 30 is decreased, the outside air 70 is pressurized by the blower 28. Thus, the air 71 necessary for combustion can be supplied. Accordingly, complete combustion can be achieved, and soot and carbon monoxide can be prevented from being generated. For this reason, maintenance of the duct and the point portion is also facilitated. In addition, troubles such as failures and shortening of life caused by defects etc. can be avoided. In addition, fires caused by firewood can be prevented.
[0022]
An example of conditions under which the exhaust pressure is applied to the outlet 12 of the point snow melting device 10 and the amount of warm air 73 that can be discharged from the outlet 12 changes will be specifically examined based on FIG. When exhaust pressure is applied to the air outlet 12, the outlet pressure B of the blower fan 30 and the pressure C near the air outlet 12 hardly change in the housing 11. Therefore, the blower 28 can supply sufficient air to the combustion chamber 20 even if the exhaust pressure becomes high as long as the blower 28 is capable of ensuring the air volume of the combustion air 71 alone. In this example, design point flow rate 5100m ³ / h, and the blowing fan 30 of the hydrostatic 25mmH ₂ O, using gamut 10~15mmH ₂ O blower 28 is employed.
[0023]
For the system of this example, for example, by installing a pressure sensor at the outlet 12 of the housing 11 or the like, it is detected that the pressure loss of the duct is fluctuating and the fuel amount of the burner 22 is automatically controlled. It is also possible to respond to changes in exhaust pressure by adding a control system. However, the addition of such an automatic control system increases the cost, and it is not so easy to detect minute fluctuations in the exhaust pressure. On the other hand, in the point snow melting device 10 of this example, by adding the blower 28, it is possible to flexibly cope with fluctuations in exhaust pressure, and it is possible to provide a point snow melting device 10 that is low in cost and high in reliability. .
[0024]
Thus, since the point snow melting apparatus 10 of this example can maintain complete combustion or combustion close to it even if the pressure loss of the duct 40 fluctuates, the heat output does not decrease.
Accordingly, it is possible to supply the hot air with a desired heat output under a wide range of conditions, and to provide an easy-to-use point snow melting device 10. Even if there is a lot of snowfall and the exhaust pressure rises, hot air 73 having a desired temperature can be supplied from the point snow melting device 10 as described above.
[0025]
In addition, since the point snow melting device 10 of this example can stably burn even if the exhaust pressure changes, it is installed on the ground instead of a semi-underground type according to the duct, so that the pressure loss of the duct increases somewhat. Can also respond sufficiently.
[0026]
【The invention's effect】
As described above, in the point snow melting device of the present invention, when the amount of outside air taken in by the first blower is reduced by providing the second blower, the outside air is subjected to pressure loss by the second blower. It is possible to prevent the fuel from flowing outside the low combustion chamber and supply mainly to the combustion chamber. Therefore, even when the duct outlet is clogged or the pressure loss in the duct increases due to the arrangement of the duct, sufficient air for combustion is ensured and stable combustion can be maintained. For this reason, it can always burn in the state of complete combustion or a state close thereto, and generation of soot and carbon monoxide can be prevented. In addition, troubles such as defects caused by defects and shortening of the apparatus can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a schematic configuration of a point snow melting device according to the present invention.
FIG. 2 is a schematic diagram showing a snow melting system using the point snow melting device shown in FIG. 1;
FIG. 3 is a schematic view showing a snow melting system using a conventional point snow melting device.
4 is a schematic view of the snow melting system shown in FIG. 3 as viewed from above.
[Explanation of symbols]
5, 92 Snow melting system 10, 90 point snow melting device 11 Housing 11a Front end 12 of housing 12 Outlet 13 Passage 20 Combustion chamber 22 Burner 28 Blower (second blower)
30 Blower fan (first blower)
31 Ventilation fan motor 32 Ventilation fan vane 40 Ducts 50 and 51 Hut 52 Hut louver 60 Line point 70 Outside air 71 Combustion outside air 72 Combustion gas 73 Hot air 80 Snow

Claims (1)

A cylindrical housing whose front end can be connected to a duct, a cylindrical combustion chamber disposed inside the housing and capable of discharging combustion gas forward, a burner for supplying fuel into the combustion chamber, and the combustion chamber A first blower for introducing outside air into the housing from behind,
A point snow melting device capable of supplying hot air mixed with outside air that has passed between the housing and the combustion chamber and the combustion gas to the object to be heated through the duct,
A point snow melting device having a second blower capable of pressurizing outside air introduced by the first blower and supplying the pressurized air to the combustion chamber.

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