JP2005213809A - Anti-freezing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-freezing system using electricity generated by utilizing a water flow of a water system in the piping of an aqueduct or piping laid along a bridge. <P>SOLUTION: The anti-freezing system comprises a casing 2 connected to a water pipe 1, a shaft bearing 2C fitted to the casing 2 to reach the inside of the casing 2, a shaft 4 inserted through the shaft bearing 2C to be rotatable, a propeller 3 fitted to the front end of the shaft 4 in the casing 2, projecting parts 2A, 2B which are fitted to the inner peripheral surface of the casing 2 at the upstream side and the downstream side of the propeller 3, respectively, to regulate a water flow direction to intersect with the extension direction of the propeller 3, and a power generator 5 generating electricity by the rotation of the shaft 4. A heater 10 is activated by using the electricity generated by the power generator 5 to prevent the freeze of the water pipe 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an anti-freezing system, and more particularly to an anti-freezing system that generates electricity using a tap water flow in a pipe of a water pipe bridge or a bridge and realizes non-freezing of the pipe.

  In cold districts, countermeasures that take into account the characteristics of each region have been conventionally taken in order to prevent water breakage due to freezing of tap water piping or pipe breakage accidents.

  The pipes of water pipe bridges and bridges are particularly exposed in the atmosphere, and there is an excessive concern about freezing.

  7 and 8 are diagrams showing an example of piping for bridge attachment. FIG. 7 is a side view of a bridge with a water pipe (an example of piping) attached, and FIG. 8 is a top view thereof. 7 and 8, the water supply pipes 101 are provided on both the left and right sides of the bridge.

  As the water supply pipe 101 installed in the state as described above, a double pipe in which the pipe is covered with a heat insulating material or a heat insulating material is used. Freezing is suppressed by the heat insulation and heat insulation effect of the double pipe.

  FIG. 9 is a perspective sectional view showing a double pipe 101 </ b> A used as the water supply pipe 101.

  As shown in FIG. 9, the double pipe 101 </ b> A includes an inner pipe 111 made of stainless steel, a resin part 112 made of hard urethane foam or the like formed so as to cover the outer periphery of the inner pipe 111, and an outer side of the resin part 112. And an outer tube 113 made of FRP (Fiber Reinforced Plastics) or the like. By the resin part 112, the heat insulation and heat insulation effect of the water pipe 101 is enhanced.

  However, even if a double pipe as described above is used, the heat insulation and heat insulation effect may not be sufficient. On the other hand, a method is conceivable in which a heater is attached to the surface of the inner tube of the double tube and a resin material as a heat insulating material or a heat insulating material is coated (filled) on the outer peripheral portion thereof.

  In this case, electric power is supplied to the heater power supply with permission from the local government. The heat retention temperature is adjusted to 4 ° C to 8 ° C as a guide.

  FIG. 10 is a diagram illustrating an example of an anti-freezing system having a heater as described above.

  As shown in FIG. 10, a power meter 59, a breaker 60, and a control plate 61 are attached to the column 58. The electric cable reaches the control board 61 from the power pole 57 via the wattmeter 59 and the breaker 60. The control plate 61 is connected to a temperature sensor 109 and a heater 110 attached to the inner tube 111. The temperature sensor 109 measures the temperature of the inner tube 111. The measurement result by the temperature sensor 109 is sent to the control plate 61, and the output of the heater 110 is adjusted. With the above configuration, the temperature of the inner tube 111 is adjusted.

Japanese Patent Application Laid-Open No. 2002-310342 discloses a double pipe structure in which a water pipe is passed through a steam pipe. Here, a heat insulating material made of foamed polyethylene is spread around the double pipe structure and then covered with a stainless steel outer cylinder. When thawing a frozen water pipe, steam is passed through the steam pipe and the water pipe is heated.
JP 2002-310342 A

  However, the freeze prevention system as described above has the following problems.

  The anti-freezing system as shown in FIG. 10 can be used as it is in a power supply area, but when used in an area where power is not supplied, it is necessary to use a diesel generator or the like. In this case, it is necessary to replenish the generator with fuel periodically, which increases the labor and cost for maintenance.

  This invention is made | formed in view of the above problems, and the objective of this invention is providing the freezing prevention system by the electric power generation using the tap water flow in piping of a water pipe bridge or a bridge.

  A freeze prevention system according to the present invention is a freeze prevention system that performs power generation using a tap water flow in a pipe of a water pipe bridge or a bridge, and realizes non-freezing of the pipe, and a casing connected to the pipe, A bearing portion that is attached to the casing so as to reach the inside of the casing, a drive shaft that is rotatably inserted in the bearing portion, a propeller that is attached to the tip of the drive shaft in the casing, and an upstream side and a downstream side of the propeller A protrusion that is attached to the inner peripheral surface of the casing that is positioned at least, a generator that generates electric power by rotation of the drive shaft, and a heater that is attached to the pipe and connected to the generator. Here, the protrusion guides water in the pipe to the propeller. Further, the heater generates heat by the electric power supplied from the generator.

  The anti-freezing system further includes a battery installed between the generator and the heater, a switch installed between the battery and the heater, and a temperature sensor for detecting the temperature of the pipe, and is detected by the temperature sensor. It is preferable to switch the electrical connection state between the battery and the heater based on the result. Here, the battery stores the electric power generated in the generator. The switch switches an electrical connection state between the battery and the heater. The temperature sensor is connected to the switch and attached to the water pipe.

  According to the present invention, power generation is performed using a tap water flow in a pipe of a water pipe bridge or a bridge, and non-freezing of the pipe can be realized by the electric power. Therefore, it is possible to provide an anti-freezing system that can be easily maintained.

  In the following, an embodiment of a freeze prevention system according to the present invention will be described.

  FIG. 1 is a diagram showing a configuration of a freeze prevention system according to the present embodiment.

  The anti-freezing system according to the present embodiment performs power generation using a tap water flow in a pipe of a water pipe bridge or a bridge, thereby realizing non-freezing (freezing prevention) of the water pipe. As the water supply pipe, a water conduit, a water distribution pipe, a water supply pipe, a water supply pipe, and the like are conceivable. In the present embodiment, the water supply pipe will be described.

  As shown in FIG. 1, the antifreezing system includes a casing 2 provided in the path of the water pipe 1 and having protrusions 2 </ b> A and 2 </ b> B on the inner peripheral surface, and a bearing portion 2 </ b> C attached to the casing 2 and reaching the inside of the casing 2. A shaft 4 (drive shaft) rotatably inserted in the bearing portion 2C, an inner propeller 3 attached to the tip of the shaft 4 in the casing 2, a battery 6 connected to the generator 5, And a heater 10 attached to the water pipe 1.

  The water pipe 1 is installed as a water pipe for a water pipe bridge or a bridge, and is used as a pipe for supplying tap water. As the water supply pipe 1, a pipe having a pipe diameter of about 50 mm or more and 400 mm or less (for example, about 80 mm) is used. The water flowing in the water pipe 1 moves from right to left in FIG.

  The casing 2 is bolted to the water supply pipe 1 at the flange joints located at both ends thereof. In FIG. 1, illustration of bolts of the flange joint portion is omitted for convenience of illustration.

  The direction of water flow as indicated by arrows (dashed lines) in FIG. 1 is defined by the protrusions 2A and 2B provided on the upstream side and the downstream side of the inner propeller 3 in the casing 2, respectively. That is, the protrusions 2 </ b> A and 2 </ b> B guide water in the water supply pipe 1 to the inner propeller 3. It is possible to generate a similar water flow even with a structure in which only one of the protrusions 2A and 2B is provided.

  The inner propeller 3 and the shaft 4 are rotated by the water flow. This rotational energy is transmitted to the generator 5. As a result, electric power is generated in the generator 5.

  The electric power generated in the generator 5 is transmitted to the battery 6. The battery 6 is connected to a heater 10 attached to the water pipe 1 via a switch 7. The switch 7 is connected to an optical sensor 8 that detects sunlight and a temperature sensor 9 that is attached to the water pipe 1 and detects the temperature of the water pipe 1 via a controller 8A. Based on the detection results of the optical sensor 8 and the temperature sensor 9, the controller 8A switches the connection state between the battery 6 and the heater 10 (that is, the ON / OFF state of the switch 7).

  When the switch 7 is in the ON state, the electric power stored in the battery 6 is supplied to the heater 10, and the water pipe 1 is warmed by the action of the heater 10. Thereby, freezing of the water pipe 1 can be suppressed.

  When the switch 7 is in the OFF state, the electric power stored in the battery 6 is not supplied to the heater 10. On the other hand, when the inner propeller 3 is rotating due to the water flow in the water pipe 1, electric power continues to be generated in the generator 5, and the generated electric power is stored in the battery 6. The electric power is then supplied to the heater 10 when the switch 7 is turned on.

  Generally, in the time zone from about 6 am to about 8 pm, the amount of water used is relatively large, so the flow velocity in the water pipe 1 is also relatively large. The maximum flow velocity in the water pipe 1 at this time is about 2 m / s or more and 3 m / s or less. Due to this flow velocity, the inner propeller 3 rotates and electric power is generated in the generator 5. The generated electric power is stored in the battery 6.

  As described above, when water flows at a certain flow rate in the water pipe 1, the water pipe 1 is hardly frozen. However, in the time zone from about 8:00 pm to about 6:00 am the next morning, the amount of water used is small (the flow rate in the water pipe 1 is small), and the outside air temperature is lowered, so that the water pipe 1 Freezes easily.

  Therefore, it is preferable to use the optical sensor 8 and the temperature sensor 9 and appropriately switch the ON / OFF state of the switch 7 in consideration of the external situation such as sunlight and the temperature of the water pipe 1. As a result, the water pipe 1 can be kept warm so as not to freeze while saving power. As a result, it is possible to form an anti-freezing cycle that is easy to maintain and manage in the water pipe bridge and the water pipe installed on the bridge.

  More specifically, based on the detection result of the temperature sensor 9, when the temperature of the water supply pipe 1 falls below a certain reference value (for example, about 6 ° C.), the switch 7 is turned on and the water supply pipe 1 is turned on. When the temperature exceeds the reference value, the switch 7 is turned off (thermostat function). Thereby, the temperature of the water supply pipe | tube 1 can be kept at 4 degreeC or more and about 8 degrees C or less.

  In FIG. 1, for convenience of illustration and description, the water supply pipe 1 is a single-layer structure pipe, but as the water supply pipe 1, a double pipe in which a resin portion is formed between an inner pipe and an outer pipe is used. It is preferable.

  Below, the structure of the above double pipes and the attachment method of the heater 10 and the temperature sensor 9 are demonstrated.

  FIG. 2 is an axial cross-sectional view of the double pipe 1 </ b> A to which the heater 10 is attached. FIG. 3 is a sectional view in the axial direction of a water pipe showing a modification thereof.

  Referring to FIG. 2, a heater 10 is attached to the inner tube 11. A resin cover 14 </ b> A is provided so as to cover the heater 10. The resin cover 14 </ b> A is attached to the inner tube 11 with an adhesive tape 15.

  Resin portion 12 is formed to cover inner tube 11 and resin cover 14A. An outer tube 13 is formed on the outer periphery of the resin portion 12.

  As the inner pipe 11, a nickel cast steel pipe (NC pipe), a SUS pipe, a polyethylene pipe or the like is used. As the resin part 12, a hard urethane foam or the like is used. As the outer tube 13, an STK tube, an FRP tube, or the like is used.

  Referring to FIG. 3, a resin tube 14B (such as a vinyl chloride tube) may be provided instead of the resin cover 14A, and the heater 10 may be provided in the resin tube 14B.

  FIG. 4 is a cross-sectional view in the axial direction of the water supply pipe showing the attached state of the temperature sensor 9.

  Referring to FIG. 4, temperature sensor 9 is fixed to inner tube 11 using band 16.

  FIG. 5 is a diagram illustrating an example of the structure of the heater 10.

  Referring to FIG. 5, heater 10 includes conductive wire 10A, heating resistor 10B covering conductive wire 10A, insulating coating 10C covering heating resistor 10B, copper braid 10D covering insulating coating 10C, and copper braid 10D. And a covering film 10E for covering.

  The heater 10 includes connectors 10F and 10G at both ends, respectively. A plurality of heaters 10 can be connected by connecting the connectors 10F and 10G.

  Next, a method of manufacturing and installing (installing) the double pipe 1A having the temperature sensor 9 and the heater 10 will be described.

  The double pipe 1A is manufactured in a factory and transported to an installation site. Accordingly, the double pipe 1A is manufactured by being divided into blocks having a length (about 6 m or less) that can be transported from the factory to the site. By joining these blocks in the field, a continuous double tube is formed.

  First, the heater 10 is attached to the inner tube 11 using the resin cover 14 </ b> A or the resin tube 14 </ b> B described above, and the temperature sensor 9 is attached using the band 16.

  Next, the inner tube 11 is inserted into the outer tube 13, and a resin such as urethane and a foaming agent are injected between the inner tube 11 and the outer tube 13. The resin portion 12 is formed by foaming the injected resin.

  Here, the connectors 10F and 10G of the heater 10 are respectively exposed from the resin portion at both ends of the block of the double tube 1A. Then, when joining the blocks of the double pipe 1A at the site, the connectors 10F and 10G of the adjacent blocks are connected to each other. Thereby, the heater 10 continuous over a plurality of blocks can be formed. The temperature sensor 9 is not necessarily attached to all blocks of the double pipe 1A manufactured at the factory.

  As described above, by fixing the temperature sensor 9 and the heater 10 to the inner pipe 11 in the factory, installation work at the site can be simplified.

  In the present embodiment, the above-described configuration forms an anti-freezing system by power generation using the water flow in the water pipe.

  As the form of water pipe bridge, for example, truss stiffening form, Langer stiffening form, four-string truss attachment form, π-type stiffening form, T-type stiffening form, fixed arc arch form, pipe beam form, etc. There may be.

  Moreover, you may attach the heater 10 not only to a water pipe but to piping apparatuses, such as a valve. Thereby, freezing of piping equipment can be controlled.

  FIG. 6 is a diagram showing a configuration of a snow melting system using a power generation system in the anti-freezing system described above.

  The snow melting system shown in FIG. 6 includes a solar panel 17, a heater 17 </ b> A attached to the solar panel, and a monitor 18 connected to the solar panel 17.

  Various displays can be made on the monitor 18 using the electric power generated in the solar panel 17. For example, the monitor 18 can be installed on a road to display traffic information and the like.

  In an area where the amount of snow is large, there is a case where light on the solar panel 17 is not sufficiently supplied due to snow on the solar panel 17 and the solar panel 17 cannot sufficiently function as power supply means to the monitor 18.

  On the other hand, snow on the solar panel 17 can be removed by supplying electric power generated by the water flow to the heater 17A.

  Further, as shown in FIG. 6, the battery 6 and the monitor 18 may be directly connected, and the power generated in the generator 5 may be supplied to the monitor 18 for display.

  As another example, the anti-freezing system described above may be used for non-freezing of a road surface in a mountain where power is not supplied. Moreover, you may use the battery 6 connected to the generator 5 as a power supply of a construction indicator light.

  Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the structure of the freeze prevention system which concerns on one embodiment of this invention. It is an axial direction sectional view of a double pipe in the state where a heater was attached. It is an axial sectional view of a double tube in a state where a heater is attached in another configuration. It is an axial direction sectional view of a double pipe in the state where a temperature sensor was attached. It is a figure which shows the structure of a heater. It is a figure which shows the structure of the snow melting system using the electric power generation system in a freezing prevention system. It is a side view which shows the bridge to which the water pipe was attached. It is a top view which shows the bridge to which the water pipe was attached. It is the perspective sectional view showing the double pipe used as a water pipe. It is a figure which shows the structure of the conventional freezing prevention system.

Explanation of symbols

  1,101 water supply pipe, 1A, 101A double pipe, 2 casing, 2A, 2B projecting part, 2C bearing part, 3 inner propeller, 4 shaft (drive shaft), 5 generator, 6 battery, 7 switch, 8 optical sensor , 8A controller, 9,109 temperature sensor, 10,110 heater, 10A lead wire, 10B heating resistor, 10C insulation coating, 10D copper braid, 10E exterior coating, 10F, 10G connector, 11,111 inner tube, 12,112 resin Part, 13, 113 outer tube, 14A resin cover, 14B resin tube, 15 adhesive tape, 16 bands, 17 solar panel, 17A heater, 18 monitor, 57 utility pole, 58 strut, 59 wattmeter, 60 breaker, 61 control board.

Claims (2)

An anti-freezing system that generates electricity using a tap water flow in a pipe of a water pipe bridge or a bridge, and realizes non-freezing of the pipe,
A casing connected to the pipe;
A bearing portion attached to the casing to reach the casing;
A drive shaft rotatably inserted in the bearing portion;
A propeller attached to the tip of the drive shaft in the casing;
A protrusion that is attached to an inner peripheral surface of the casing located on at least one of the upstream side and the downstream side of the propeller, and that guides water in the pipe to the propeller;
A generator for generating electric power by rotation of the drive shaft;
An anti-freezing system comprising: a heater attached to the pipe and connected to the generator and generating heat by electric power supplied from the generator. A battery that is installed between the generator and the heater and stores electric power generated in the generator;
A switch that is installed between the battery and the heater, and switches an electrical connection state between the battery and the heater;
A temperature sensor connected to the switch and attached to the pipe for detecting the temperature of the pipe;
The freeze prevention system according to claim 1, wherein the electrical connection state between the battery and the heater is switched by the switch based on a detection result by the temperature sensor.

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