JPH0665772U - Exhaust heat utilization type road heating device - Google Patents

Abstract

(57) [Abstract] [Purpose] By utilizing the exhaust heat of a heating boiler that is operated for 24 hours in cold regions, maintenance costs can be substantially eliminated, and a road heating road coating layer of 24 can be used.
Keep warm for hours. [Structure] A two-tube heat exchanger 2 is provided in an exhaust stack 1A of a heating boiler 1. The two-tube heat exchanger 2 has a heat medium which is heated by exhaust heat and a water passage coil which is heated by this heat medium inside. The hot water tank 21 is the hot water supply pipe 19
Through the hot water return pipe 20 and the inflow port of the water flow coil. A hot water circulation pump 24 that operates when the heat medium of the heat exchanger 2 rises to 50 ° C. is provided in the middle of the hot water return pipe 20. A snow melting water circulation pipe 28 for circulating hot water as snow melting water is connected to the warm water tank 21.
A heat radiating portion 28C is formed midway. The snowmelt water circulation pipe 28 is provided with a snowmelt water circulation pump 29 that starts when the temperature of the hot water in the hot water tank 21 rises to 30 ° C.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an exhaust heat type road heating device suitable for melting snow on a road surface of an entrance of a private house or an office or a parking lot.

[0002]

[Prior art]

 In recent years, due to improvements in living standards, an increase in the number of automobiles owned, and difficulty in securing snow removal locations, etc., individual houses and business establishments perform road heating work on the road in front of the entrance and parking lots to melt snow. Things are being actively done. As a heat supply means for this load heating, an electric type in which a heating wire is laid and a hot water type in which hot water is supplied from a gas or kerosene boiler to a radiation pipe are known.

[0003]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional technology, the heating wire is heated by electricity, and since hot water heated by gas and kerosene is directly supplied to the radiating pipe, there is a drawback that the maintenance cost is high, and this drawback is This is an obstacle to the spread of road heating devices in private houses.

Further, in order to save the maintenance cost, there is known a type in which the heating wire is energized or the boiler is started only during snowfall, but there is a problem that the start switch is forgotten to be turned on, and there is a rise until snow melting. It takes a long time to complete, and there is a problem that snow cannot be completely melted because the road surface is covered with snow.

Further, in order to shorten the rise time described above, a road surface covering layer such as an asphalt layer covering the heating wires or the heat radiating pipes has been thinned. Therefore, there is a problem that the material cost and the construction cost increase because the strength must be improved.

In view of the above-mentioned drawbacks and problems of the conventional technology, the present invention focuses on discharging the exhaust heat of the heating boiler operating in a cold region for 24 hours without reusing it. An object of the present invention is to provide an exhaust heat utilization type road heating device which can substantially maintain the maintenance cost and can keep the road surface heated for 24 hours.

[0007]

[Means for Solving the Problems]

 MEANS TO SOLVE THE PROBLEM The means of this invention comprised in order to solve the subject mentioned above is provided in the exhaust cylinder of the heating boiler, and the heat exchanger which produces | generates warm water with a heat medium, and a hot water supply pipe and hot water to this heat exchanger. The hot water tank connected via a return pipe and the hot water supply pipe or the hot water return pipe are provided, and the hot water tank and the heat exchanger are connected only when the heat medium in the heat exchanger is at a predetermined temperature or higher. A hot water circulation pump for circulating hot water between the two, the both ends of which are connected to the hot water tank, and the middle part of the snow melting water circulation pipe is a heat generating portion, and the snow melting water circulation pipe is provided with the hot water in the hot water tank. It comprises a snowmelt water circulation pump that circulates the warm water in the hot water tank as snowmelt water in the snowmelt water circulation pipe when the temperature rises to a predetermined temperature.

[0008]

[Action]

 When the temperature of the heat medium in the heat exchanger rises to a predetermined temperature, the hot water circulation pump is started to circulate hot water between the heat exchanger and the hot water tank. When the temperature in the hot water tank rises to a predetermined temperature, the snow melting water circulation pump starts and the hot water in the hot water tank is supplied as snow melting water to the snow melting water circulation pipe for circulation.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, reference numeral 1 indicates a gas or kerosene heating boiler widely used in ordinary households, and the heating boiler 1 includes an exhaust pipe 1A and a hot water supply pipe 1B.

Reference numeral 2 denotes a heat exchanger provided in the middle of the exhaust stack 1A. As shown in FIG. 2, the heat exchanger 2 has a hollow cylindrical can body 3 with both ends in the axial direction open, and a large diameter hole portion 4A in the center, and an outer peripheral side of the large diameter hole portion 4A. Is formed in a disk shape having a large number of small-diameter holes 4B, 4B, ... A large-diameter heat transfer cylinder 5 and a large number of small-diameter heat transfer cylinders 6, 6, which are installed between the end plates 4 and 4 so as to communicate with the large-diameter hole portions 4A, 4A and the small-diameter hole portions 4B, 4B, respectively. .. and a spiral shape in which the small-diameter heat transfer cylinders 6, 6, ... Are fitted in the can body 3 so as to surround them, and the outflow port 7A and the inflow port 7B are provided on the peripheral surface of the can body 3. Of the water passage coil 7, outer cylinders 8 and 9 integrally connected to the outer surface sides of the end plates 4 and 4 and having exhaust tube socket portions 8A and 9A formed on the tip side, and an outer cylinder 8 on the upstream side. Mounting bracket inside Double smoke exhaust guide bodies 11 and 12 made of frustoconical cylindrical bodies attached via 10 and 10 and a pair of circulation pipe connection ports 13 and 14 provided on the peripheral surface of the can body 3. , The connection port 15 for the cylinder, the connection port 16 for the escape pipe, and the socket 17 for the temperature sensor (see FIG. 3). The heating medium A made of water contacts the water flow coil 7 in the can body 3. It is filled up. Reference numeral 18 in the figure denotes a heat insulating material adhered to the outer peripheral surface of the can body 3.

Thus, the heat exchanger 2 of this embodiment heats the heat medium A in the can body 3 by exhaust heat, and heats the water in the water flow coil 7 by the heated heat medium A, a so-called two-pipe type. It is configured as a heat exchanger.

Next, 19 denotes a hot water supply pipe whose one end side 19A is connected to the outlet port 7A of the water passing coil 7, and 20 is a hot water return pipe whose one end side is connected to the inlet port 7B of the water passing coil 7. Indicates. Reference numeral 21 denotes a hot water tank for temporarily storing the hot water heated by the heat exchanger 2. The hot water tank 21 has the other end side 19B of the hot water supply pipe 19 connected to the upper side thereof and the hot water return section 21 to the lower side thereof. The other end 20B of the pipe 20 is connected. Further, the hot water tank 21 is provided with a thermometer 22 and a liquid level gauge 23, respectively.

Reference numeral 24 denotes a hot water circulation pump provided in the middle of the hot water return pipe 20, and the hot water circulation pump 24 is for circulating hot water between the hot water tank 21 and the water passage coil 7. Reference numeral 25 denotes a thermostat that is turned off when the heat medium A in the heat exchanger 2 drops to 40 ° C. and turned on when the heat medium A rises to 50 ° C. to operate the hot water circulation pump 24. 25 is electrically connected to a temperature sensor 26 including a thermocouple or the like provided in the socket 17 of the heat exchanger 2, and is also electrically connected to a hot water circulation pump 24 via a control panel 27. The control panel 27 has a start / stop switch for the hot water circulation pump 24.

Next, 28 indicates a snow melting water circulation pipe whose one end side 28 A is connected to the bottom of the hot water tank 21 and the other end side 28 B is connected to the upper part, and the middle of the snow melting water circulation pipe 28 is divided from a plurality of branch pipes. It becomes the heat radiation part 28C.

Reference numeral 29 denotes a snowmelt water circulation pump which is provided in the middle of the snowmelt water circulation pipe 28 and circulates the warm water in the warm water tank 21 into the snowmelt water circulation pipe 28. The snow melting water circulation pump 29 is electrically connected to a temperature switch 30 provided in the hot water tank 21, and is started by turning on the power when the hot water in the hot water tank 21 rises to, for example, 30 ° C. It is like this. On the other hand, the lower limit temperature at which the temperature switch 30 is turned off is set to, for example, 25 ° C., and the heat radiating portion 28C of the snow melting water circulation pipe 28 allows the road surface for load heating to maintain a temperature of, for example, 20 ° C. Has become.

The apparatus of this embodiment is configured as described above, and its operation will be described below. The combustion exhaust gas of about 300 to 600 ° C. discharged from the heating boiler 1 heats the heat medium A in the heat exchanger 2 via the exhaust stack 1A, and when the heat medium A rises to a predetermined temperature, for example, 50 ° C., The thermostat 25 is turned on and the hot water circulation pump 24 is started. As a result, the high temperature water heated to about 50 ° C. in the water flow coil 7 is supplied to the hot water tank 21 via the hot water supply pipe 19, and the low temperature water in the hot water tank 21 passes through the hot water return pipe 20. The hot water is circulated by being supplied to the water coil 7, and the temperature of the hot water in the hot water tank 21 rises.

When the temperature of the hot water in the hot water tank 21 reaches 30 ° C., the temperature switch 30 is turned on and the snow melting water circulation pump 29 is started to circulate the hot water of 30 ° C. or higher as the snow melting water in the snow melting water circulation pipe 28. Then, the heat radiating portion 28C heats the load heating coating layer to 20 ° C. necessary for snow melting.

As described above, in the present embodiment, the heat exchanger 2 is provided with the thermostat 25 which operates by the temperature change of the heat medium A, and when the heat medium A falls below a predetermined temperature, 40 ° C. in the embodiment, a hot water circulation pump. By stopping the operation of 24, it is possible to prevent the temperature in the heat exchanger 2 from being lowered and the occurrence of dew condensation.

Further, since the hot water tank 21 is interposed between the water flow coil 7 of the heat exchanger 2 and the snow melting water circulation pipe 28, the low temperature water whose temperature has been lowered by heat radiation is directly returned to the heat exchanger 2 to generate heat. It is possible to cool the inside of the exchanger 2 and prevent a situation in which dew condensation occurs.

Although the two-tube heat exchanger 2 is used in this embodiment, a one-tube heat exchanger may be used because hot water is stored in the hot water tank 21 overnight.

[0021]

[Effect of device]

 Since the present invention is configured as described above in detail, it has the following effects. In cold regions, the exhaust heat from the heating boiler, which operates 24 hours a day, is used, so maintenance costs for load heating can be almost eliminated. For the same reason as above, the road surface covering layer can be constantly warmed and the rise time can be set to zero, so that the snow can be quickly melted even in the early stage of snowfall. Since the road surface coating layer that is heated for 24 hours can be formed thicker to store heat, and the present invention is preferable, and the present invention is suitable for use in snow melting on a road surface on which a vehicle is put. The hot water heated by the heat exchanger is temporarily stored in the hot water tank, and the hot water in the hot water tank is supplied to the snowmelt water circulation pipe as snowmelt water. The durability can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a load heating device using exhaust heat according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a two-tube heat exchanger used in the apparatus of the embodiment with a part broken away.

FIG. 3 is a sectional view taken along the line III-III in FIG.

[Explanation of symbols]

 1 Heating Boiler 1A Exhaust Cylinder 2 Heat Exchanger 19 Hot Water Supply Pipe 20 Hot Water Return Pipe 24 Hot Water Circulation Pump 28 Snow Melt Water Circulation Pipe 29 Snow Melt Water Circulation Pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Hirata 2-12-503 Minami Heiwadori, Shiraishi-ku, Sapporo, Hokkaido

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger which is provided in an exhaust stack of a heating boiler and which produces hot water by a heat medium, and a hot water tank which is connected to the heat exchanger via a hot water supply pipe and a hot water return pipe, A hot water circulation pump provided in the hot water supply pipe or the hot water return pipe, which circulates the hot water between the hot water tank and the heat exchanger only when the heat medium in the heat exchanger has a predetermined temperature or higher, and the both ends are the A snow melting water circulation pipe connected to a hot water tank and having a heating portion in the middle, and provided in the snow melting water circulation pipe, when the warm water in the warm water tank rises to a predetermined temperature, the warm water in the warm water tank is melted An exhaust heat utilization type road heating device comprising a snow-melting water circulation pump which is circulated in the snow-melting water circulation pipe as the above.