JPH0571252A - Snow-melting device - Google Patents

Abstract

PURPOSE:To prevent decrease of temperature on overloading of the thermal media returned to a thermal source apparatus and also prevent dew from generating in a heatexchanger. CONSTITUTION:A thawing device is provided with a burner 5 as a heat source, a thermal source apparatus 1 having a heatexchanger 4 heated by the burner 5, and a thawing panel 9. The heatexchanger 4 and the thawing panel 9 are jointed to each other with the thermal media flowing tube 7 having a circulation pump 6 and the thermal media return tube 8 to form a circular system. And a bypass 10 is provided between the thermal media flowing tube 7 at the delivery side of the circulation pump 6 and the thermal media return tube 8. The bypass volume is adjusted so that the thermal media temperature of the return of media of the heatexchanger becomes higher than a specified temperature by this bypass 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow-melting device for melting snow by circulating a heat medium heated by a heat source machine to a snow-melting panel installed on a road, a garden, a roof or the like.

[0002]

2. Description of the Related Art A snow melting device of this type is disclosed, for example, in Japanese Patent Laid-Open No. 1-1.
As disclosed in Japanese Patent No. 63374, a heat source machine and a snow melting panel are annularly connected by a heat medium circulation path having a circulation pump, and a heat medium such as hot water heated by the heat source machine is supplied to the snow melting panel. It is known that the snow above is melted and the heat medium deprived of heat by the snow melting panel is returned to the heat source machine and heated again.

[0003]

In the above-described snow melting device, when the snow melting operation is performed in an overloaded state such as when a large amount of snow is accumulated on the snow melting panel, the heat supplied from the heat source machine to the snow melting panel. The temperature of the medium is significantly lowered, and the heat medium having the low temperature is returned to the heat source device. For this reason, in the heat source machine, there is a concern that dew may form around the heat exchanger, causing the heat exchanger to rust or corrode. Of course, if you use a heat source machine with a large heat output or limit the number of snow melting panels used, you can suppress the temperature drop of the heat medium returned to the heat source machine to some extent, but if you do this, equipment There are problems that the cost is high and the usability is poor.

The present invention has been made in view of the above-mentioned facts, and lowers the temperature when the heat medium returned to the heat exchanger of the heat source machine is overloaded without increasing the facility cost or degrading the usability. The purpose of the present invention is to prevent the occurrence of dew condensation on the heat exchanger so that the snow melting apparatus can be used for a long period of time.

[0005]

According to the present invention, a heat source machine having a heat source and a heat exchanger heated by the heat source and a snow melting panel are provided, and a heat medium heated by the heat exchanger is used as a snow melting panel. In a snow melting device that circulates and melts snow, a heat exchanger and a snow melting panel are annularly connected with a heat medium forward pipe having a circulation pump and a heat medium return pipe, and a heat medium forward pipe on the discharge side of the circulation pump and heat A bypass device that adjusts the bypass amount is provided between the medium return pipe and the return heat medium temperature of the heat exchanger so as to be equal to or higher than a predetermined temperature.

Further, according to the present invention, a heat source and a heat source machine having a heat exchanger heated by the heat source and a snow melting panel are provided, and the heat medium heated by the heat exchanger is circulated to the snow melting panel to melt the snow. In the snow melting apparatus for performing, the heat exchanger and the snow melting panel are annularly connected with the heat medium forward pipe and the heat medium return pipe having the circulation pump, and the heat medium forward pipe and the heat medium return pipe on the discharge side of the circulation pump. A heat exchange device for heating the heat medium of the heat medium return pipe with the heat medium of the heat medium outward pipe is provided between the two.

[0007]

According to the first aspect of the present invention, when a large amount of snow accumulates on the snow melting panel and becomes overloaded, a part of the heat medium in the heat medium outward pipe flows to the heat medium return pipe through the bypass device. The temperature of the returning heat medium of the heat exchanger is maintained at a predetermined temperature or higher. Therefore, it is possible to prevent the low-temperature heat medium from returning to the heat exchanger, and there is no concern that dew condensation may occur around the heat exchanger.

Further, according to the second aspect of the present invention, since the heat medium of the heat medium return pipe is heated by the heat medium of the heat medium outward pipe, the return heat medium of the heat exchanger is returned even in the overload state. The temperature can be maintained above a predetermined temperature to prevent condensation around the heat exchanger.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a heat source machine composed of a heat exchanger 4 having a combustion chamber 2 and a liquid chamber 3 and a burner 5 as a heat source, and the burner 5 faces the combustion chamber 2 sideways. One end of a heat medium forward pipe 7 having a circulation pump 6 is connected to the upper part of the liquid chamber 3, and a heat medium return pipe 8 is connected to the lower part of the liquid chamber 3.
One end of is connected. Further, a plurality of snow melting panels 9 are provided between the other end of the heat medium outward pipe 7 and the other end of the heat medium return pipe 8.
Are connected in series (or in parallel).

A bypass device 10 is provided between the heat medium forward pipe 7 and the heat medium return pipe 8 on the discharge side of the circulation pump 6. The bypass device 10 includes a bypass pipe 11 that connects the heat medium outward pipe 7 and the heat medium return pipe 8 and a two-way valve 12 provided in the bypass pipe. The two-way valve 12 is a temperature sensor 1 that detects the temperature of the heat medium returned to the heat exchanger 4.
3, the valve opening is automatically adjusted so that the temperature detected by the temperature sensor 13 becomes equal to or higher than a predetermined temperature.

When combustion is performed in the burner 5, the heat medium (for example, antifreeze liquid) in the liquid chamber 3 is heated by the combustion gas. The heat medium heated in the liquid chamber 3 is supplied to the snow melting panel 9 through the heat medium outward pipe 7 by the operation of the circulation pump 6.
Here, the heat medium whose temperature has been lowered by melting the snow on the snow melting panel 9 returns to the liquid chamber 3 through the heat medium return pipe 8 and is heated again.

When a large amount of snow accumulates on the snow melting panel 9 and becomes overloaded, the temperature of the heat medium supplied to the snow melting panel 9 drops significantly and becomes low. In addition, the temperature sensor 13
The detection temperature of is also low. At this time, the two-way valve 12 opens,
The valve opening is adjusted so that the temperature detected by the temperature sensor 13 is equal to or higher than a predetermined temperature. Therefore, a part of the high-temperature heat medium discharged by the circulation pump 6 flows to the heat medium return pipe 8 through the bypass pipe 11, and the heat medium temperature of the return heat exchanger 4 is maintained at a predetermined temperature or higher. It

In this embodiment, the high temperature heat medium of the heat exchanger 4 is supplied to the snow melting panel 9 to continue the snow melting operation, while a part of the high temperature heat medium is passed to the heat medium return pipe 8 by the bypass device 10. Since the temperature of the heat transfer medium returned to the heat exchanger 4 can be maintained at a predetermined temperature or higher, even if a large amount of snow accumulates on the snow melting panel 9 and an overload condition occurs, the heat transfer medium of the low temperature heat exchanges. It can be prevented from being returned to the liquid chamber 3 of the vessel 4,
It is possible to prevent the combustion exhaust gas in the combustion chamber 2 from being cooled and to prevent dew condensation on the walls of the combustion chamber, and to prevent rusting and corrosion of the heat exchanger 4. Further, the heat source device 1 only needs to have a heat output suitable for a normal load, and the number of snow melting panels 9 to be used has a degree of freedom.

2 to 4 show other embodiments of the present invention. In FIG. 2, the bypass device 10 is composed of a bypass pipe 11 and a three-way valve 14, and in FIG. The device 10 is a four-way valve. Further, in the one shown in FIG. 4, the heat exchange device 15 is used instead of the bypass device 10. This heat exchange device 15 is provided between the heat medium forward pipe 7 and the heat medium return pipe 8 on the discharge side of the circulation pump 6, and heats the heat medium of the heat medium return pipe 8 whose temperature is low in the snow melting panel 9 to the heat medium. It is heated by the high temperature heat medium of the outgoing pipe 7.

[0016]

Since the present invention is constituted as described above, when a large amount of snow is accumulated on the snow melting panel and an overload condition occurs, the heat discharged from the circulation pump is set to the one described in claim 1. A part of the high temperature heat medium of the medium advancing pipe is caused to flow to the heat medium returning pipe by the bypass device, and in the one according to claim 2, the heat medium of the heat medium returning pipe whose temperature is low in the snow melting panel is transferred to the heat medium returning pipe. It can be heated by the high temperature heat medium of the tube, and while the snow melting operation is continued, the heat medium temperature of the return of the heat exchanger does not become low so that dew condensation does not occur in the heat exchanger, and the rust of the heat exchanger The snow melting device can be favorably used for a long period of time by preventing sticking and corrosion.

Further, since it is not necessary to increase the heat output of the heat source device in accordance with the overload, the equipment cost can be prevented from increasing, the number of snow melting panels to be used is flexible, and the usability is excellent. ..

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view of a snow melting device showing an embodiment of the present invention.

FIG. 2 is a schematic configuration explanatory view of a snow melting device showing another embodiment of the present invention.

FIG. 3 is a schematic configuration explanatory view of a snow melting device showing another embodiment of the present invention.

FIG. 4 is a schematic configuration explanatory view of a snow melting device showing still another embodiment of the present invention.

[Explanation of symbols]

 1 Heat Source Machine 4 Heat Exchanger 5 Burner (Heat Source) 6 Circulation Pump 7 Heat Medium Forward Pipe 8 Heat Medium Return Pipe 10 Bypass Device 15 Heat Exchanger

Claims (2)

[Claims] 1. A snow melting device comprising a heat source and a heat source machine having a heat exchanger heated by the heat source, and a snow melting panel, wherein the heat medium heated by the heat exchanger is circulated through the snow melting panel to perform snow melting. In, the heat exchanger and the snow melting panel are annularly connected with the heat medium forward pipe and the heat medium return pipe having a circulation pump,
A bypass device for adjusting the amount of bypass is provided between the heat medium forward pipe and the heat medium return pipe on the discharge side of the circulation pump so that the return heat medium temperature of the heat exchanger is equal to or higher than a predetermined temperature. And a snow melting device. 2. A snow melting device comprising a heat source, a heat source machine having a heat exchanger heated by the heat source, and a snow melting panel, wherein the heat medium heated by the heat exchanger is circulated through the snow melting panel to melt the snow. In, the heat exchanger and the snow melting panel are annularly connected with the heat medium forward pipe and the heat medium return pipe having a circulation pump,
A snow melting device characterized in that a heat exchange device for heating the heat medium of the heat medium return pipe with the heat medium of the heat medium forward pipe is provided between the heat medium forward pipe and the heat medium return pipe on the discharge side of the circulation pump. apparatus.