JP2005060940A - Remaining water discharge mechanism for sprinkler system snow melting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remaining water discharge mechanism for a sprinkler system snow melting device capable of discharging water remaining in a main pipe to the outside while stopping sprinkling. <P>SOLUTION: In this sprinkler system snow melting device for spraying water for a road surface 21 from a nozzle 4 buried in the ground, a vent pipe 5a for draining water remaining in the main pipe 2 is provided, and a movable valve 6a capable of opening and closing a flow passage 9a is installed in the escape pipe 5a. When a pump 1 is operated to spray water, water pressure transmitted from the main pipe 2 acts on the movable valve 6a to close the flow passage 9a by a means for compressing an energizing member 8. When the pump 1 stops, water pressure transmitted from the main pipe 2 is reduced to move the movable valve 6a by utilizing energizing force of the energizing member 8. When spraying of water is stopped, the water remaining in the main pipe 2 is discharged to the outside by the remaining water discharge mechanism for the sprinkler system snow melting device opening the flow passage 9a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a residual water discharge mechanism for a water spray type snow-breaking device that prevents snow accumulation by radiating water from a nozzle embedded in the ground to a road surface.
[0002]
[Prior art]
In order to prevent snow accumulation on the road surface, snow extinguishing devices are widely used mainly in snowfall areas, and some methods of burying a heating element such as a heating wire in the ground are used as a method of extinguishing snow. However, a water spray type snow squirting device that radiates water to the road surface to dissolve snow is most popular. The water used in this watering type snow-melting device is mainly groundwater that has been pumped up, pumped to the main pipe with increased pressure, and sprinkled from the nozzle at the end to the ground surface through the branch pipe. .
[0003]
In the water spray type snow-melting device, each facility such as a pump is installed in a place where a well for pumping up groundwater is installed, and the main pipe for water supply is embedded in the ground along the road starting from here. The branch pipe branched from the main pipe rises toward the road surface, and has a nozzle at the end of the branch pipe. Normally, water is supplied to the main pipe with an extension of about 1 km with a single pump, but it is sent out with sufficient pressure to overcome the road gradient and resistance in the pipe and to reliably send water to the end. .
[0004]
[Problems to be solved by the invention]
Pumps that send water for sprinkling do not always operate, but the temperature and snow cover are monitored by sensors, and limited water spraying is performed only during snow to reduce groundwater and power consumption. Yes. Therefore, when the weather recovers and there is no snow, the sensor detects this and automatically stops the pump, but water remains in the main pipe and branch pipe downstream from the pump even after the pump stops. Yes. At this time, since the water inside the nozzle continues to sprinkle little by little from the nozzle at a low altitude due to the action of the road gradient, the water diffuses in the form of a film on the road surface. If it freezes, the traffic of cars and people becomes very dangerous.
[0005]
In order to prevent such a situation, a dedicated valve for removing water remaining in the pipe after the pump is stopped may be installed. This valve is operated according to an electrical command, and can operate according to the stoppage of the pump to discharge water in the pipe, but water at a position lower than this valve cannot be discharged. Therefore, the valve should be installed at the lowest point of the pipe, but the place may be far away from the pump due to land and terrain problems, making it difficult to install and maintain the electrical wiring.
[0006]
The present invention has been developed on the basis of such an actual situation, and aims to provide a residual water discharge mechanism of a watering type snow squeezing device capable of discharging water remaining in a pipe to the outside when watering is stopped. .
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention for overcoming the above problem, a movable valve capable of opening and closing a flow path is provided inside a relief pipe for draining water remaining in the main pipe, and the flow path is opened with respect to the movable valve. An urging member that exerts an urging force in the direction, and when the pump is operated for watering, the movable valve is moved in the direction against the urging force of the urging member by the water pressure transmitted from the main pipe. When the passage is closed and the pump is stopped, the urging force of the urging member is adjusted so that the movable valve is moved in the urging direction of the urging member to open the flow path due to a decrease in water pressure transmitted from the main pipe. It is the residual water discharge mechanism of the watering type snow-melting apparatus characterized by being made.
[0008]
The residual water discharge mechanism in the pipe according to the present invention discharges water remaining in the main pipe even after the pump is stopped to an external gutter, etc., and is installed at the lowest altitude in the main pipe buried along the road. The escape pipe for draining water branches from the main pipe, and this end is installed in a place where drainage is possible such as a gutter. The escape pipe can be opened and closed by a movable valve, and it is necessary to close the flow path when the pump is operating and open the flow path to discharge water in the main pipe when the pump is stopped. The movable valve can be freely moved within a certain range by some holding means, and when the movable valve is pushed by the water pressure from the main pipe and moves downstream, the flow path in the escape pipe is closed.
[0009]
When the pump is operating for water spraying, the water pressure in the main pipe increases, so the movable valve closes the flow path and the drain pipe is not drained. When the pump is stopped, the water pressure in the main pipe decreases, but the movable valve cannot move due to the water pressure of the remaining water, and water cannot be discharged from the escape pipe. Therefore, the movable valve is combined with an urging member such as a spring, and has a structure that can move the movable valve to the upstream side against the water pressure using this urging force. Therefore, when the water pressure is reduced by stopping the pump, the movable valve is moved by the urging force of the urging member to open the flow path in the escape pipe, so that the water remaining in the main pipe can be discharged.
[0010]
The energizing force of the energizing member and the size of the movable valve that moves under water pressure need to be fully studied at the design stage so that the flow path can be reliably opened and closed according to the operation and stoppage of the pump. In addition, various factors such as pump output, main pipe length and altitude are different for each construction site, so these points should be considered. The escape pipe is buried in the ground like the main pipe, and the movable valve is often housed in a manhole for maintenance and management.
[0011]
The invention according to claim 2 is the same as the invention according to claim 1, for draining water remaining in the pipe when the pump is stopped, and for releasing the water remaining in the main pipe. A valve box disposed in the middle of the valve, a movable valve attached to one end of an arm swinging around a fulcrum inside the valve box and opening and closing a flow path, and the other end of the arm with respect to the movable valve And a weight that exerts an urging force in the opening direction of the flow path, and when the pump is operated for watering, the movable valve is moved in a direction against the urging force of the weight by the water pressure transmitted from the main pipe. When the flow path is closed and the pump stops, the urging force due to the weight of the weight is adjusted so that the movable valve is moved in the urging direction of the weight and the flow path is opened by the decrease in the water pressure transmitted from the main pipe. Residual water of a water spray type snow-melting device It is out mechanism.
[0012]
This residual water discharge mechanism is also installed at the lowest elevation in the main pipe, and a relief pipe for draining water branches from the main pipe. A valve box is installed in the middle of the escape pipe, and a movable valve that opens and closes the flow path is provided therein, and water that has passed through the valve box is discharged to a side groove or the like. The movable valve is coupled to one end of the arm, and a weight is attached to the other end. The arm is configured to be rotatably supported around a fulcrum and swingable. Moves in the direction of closing the flow path, and when water pressure acts on the movable valve, the movable valve moves in the direction of closing the flow path, and the weight is lifted against gravity.
[0013]
When the pump is operating due to water sprinkling, the water pressure in the main pipe increases and the movable valve lifts the weight and closes the flow path.On the other hand, when the pump stops, the pressure in the main pipe decreases, so the weight is reduced by the weight of the weight. Is opened and residual water is discharged. The size of the movable valve, the weight of the weight, the length of the arm, the position of the fulcrum, etc. must be fully studied to ensure the functioning of the present invention, and the output of the pump, the length of the main pipe and the altitude should be taken into consideration. It is.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a structural example of the residual water discharge mechanism described in claim 1, FIG. 1 is a longitudinal sectional view, and FIG. 2 is a plan view. However, in FIG. 2, the escape pipe 5a and the like have a cross-sectional shape. Both figures show a state in which the pump 1 is stopped. The groundwater pumped up from the water vein is sent to the main pipe 2 by the pump 1, and a large number of branch pipes 3 branch from the main pipe 2 toward the ground surface, and water flows from the nozzle 4 at the end of the branch pipe 3 to the road surface 21. Radiated. The residual water discharge mechanism is accommodated in a manhole 10 constructed in the ground, and an escape pipe 5a branched from the main pipe 2 passes through the manhole 10 and its end protrudes into the side groove 22. The escape pipe 5a has a shape in which a plurality of pipes having a circular cross section are connected, and the manhole 10 has a thick cross section. A cover 11 is installed on the manhole 10, and an auxiliary drain pipe 12 for removing rainwater and the like is installed on the bottom.
[0015]
A disc-shaped movable valve 6a having a shaft in the center is incorporated inside the escape pipe 5a, and can be moved in the flow direction by a holder 7f on the upstream side of the movable valve 6a, and on the downstream side of the movable valve 6a. A spring (biasing member) 8 is disposed in the spring 8, and the spring 8 is incorporated in a compressed state from a natural length, and therefore generates a biasing force that moves the movable valve 6a to the upstream side. The periphery of the spring 8 is surrounded by the holder 7r and is not detached, and each holder 7f, 7r is connected to the escape pipe 5a by the spoke 23 because water passes through the outer periphery. When the movable valve 6 a is moved upstream by the spring 8, the flow path 9 a of the escape pipe 5 a is opened and water can be discharged to the side groove 22.
[0016]
While the pump 1 is stopped, although there is residual water in the main pipe 2, the water pressure acting on the movable valve 6 a is low, so the flow path 9 a is opened by the urging force of the spring 8, and the water is discharged to the side groove 22. When the pump 1 is operated, the water pressure in the main pipe 2 and the escape pipe 5a increases, so that the movable valve 6a is moved downstream against the biasing force of the spring 8, and the flow path 9a is closed. Thereafter, during the operation of the pump 1, the flow path 9 a is kept closed, and water is emitted only from the nozzle 4. FIG. 3 shows the same composition as FIG. 1, but the pump 1 is operating and the movable valve 6a moves downstream to close the flow path 9a.
[0017]
4 and 5 show a structural example of the residual water discharge mechanism described in claim 2, FIG. 4 is a longitudinal sectional view, and FIG. 5 is a plan view. However, in FIG. 5, the valve box 13 and the like have a cross-sectional shape. In both figures, the pump 1 is stopped. The escape pipe 5 b branches from the main pipe 2 and passes through the manhole 10 to reach the side groove 22, but a valve box 13 is interposed in the manhole 10. A movable valve 6b capable of closing the flow path 9b is attached to the inside of the valve box 13, and is integrated via a fulcrum 14 and an arm 16 penetrating both side surfaces of the valve box 13. The fulcrum 14 is rotatably supported on both sides by a bearing 15, and a sealing material is incorporated adjacent to the bearing 15 so that water in the valve box 13 does not leak.
[0018]
The end of the fulcrum 14 protrudes outside the valve box 13, and an arm 16 that supports the weight 18 is attached to this position. The weight 18 is sandwiched between two stoppers 17 so as not to move freely on the arm 16, and the movement range is limited. The stopper 17 can be fixed at an arbitrary position of the arm 16. Due to the weight of the weight 18, the movable valve 6b moves in a direction to open the flow path 9b. However, when water pressure from the main pipe 2 acts on the movable valve 6b, the movable valve 6b moves in the direction to close the flow path 9b and simultaneously moves the weight 18 lift. The weight 18 can store about 10 liters of water so that its own weight can be increased or decreased. Further, in order to drain the water in the weight 18, a drain hole 19 is provided at the bottom, and the water escapes over time. This flow rate is set so that the entire amount can be removed in about five minutes.
[0019]
The weight 18 can store water as described above, and can supply water from the valve box 13 via the water conduit 20. During operation of the pump 1, the movable valve 6 b closes the flow path 9 b, so that water is stored in the valve box 13, and this water is sent to the weight 18 through the water conduit 20. However, at this time, the flow rate of the conduit 20 is about 1 liter per minute, and a flow rate adjusting valve may be provided.
[0020]
FIG. 6 shows a state where the pump 1 is operating with the same composition as FIG. When the pump 1 is operated, the water passes through the main pipe 2 and the escape pipe 5b and flows into the valve box 13, and water pressure acts on the movable valve 6b to close the flow path 9b. At this time, since the inside of the weight 18 is empty, it can be easily lifted. Once the flow path 9b is closed, the air in the valve box 13 escapes from the water conduit 20, and then water is sent from the water conduit 20 to the weight 18 so that the weight of the weight 18 increases. However, even when the weight 18 is filled with water, the water pressure acting on the movable valve 6b is larger, so the flow path 9b is not opened. The water in the weight 18 overflows when it is full, but this is caused to flow from the auxiliary drain pipe 12 at the bottom of the manhole 10 to the side groove 22. A small amount of water also flows out from the drain hole 19 of the weight 18.
[0021]
When the pump 1 is stopped from the state of FIG. 6, the water pressure in the valve box 13 decreases, so that the movable valve 6 b opens the flow path 9 b due to the weight of the weight 18. Once the flow path 9b is opened, the water remaining in the main pipe 2 and the like is rapidly discharged to the side groove 22. At this time, the water in the weight 18 gradually escapes from the drain hole 19, but the movable valve 6b continues to open the flow path 9b by the weight of the weight 18 alone even when it becomes empty.
[0022]
FIG. 7 is a schematic view showing a place where the residual water discharge mechanism according to the present invention is installed, and the ground and the like are shown in a longitudinal sectional view. The pump 1 is installed in accordance with the water vein, and the main pipe 2 enters the ground from here, and initially descends on the slope according to the road surface 21, but starts to climb up the slope from the middle. The position where this gradient changes is the lowest in the surrounding area, so the residual water discharge mechanism is installed here, and the end of the main pipe 2 is also located at the bottom of the slope. It is installed.
[0023]
【The invention's effect】
As in the first and second aspects of the invention, by providing a residual water discharge mechanism that can quickly discharge water remaining in the main pipe to the outside after the pump is stopped, the road surface can be frozen by residual water, which has been a problem until now. Since it can be prevented, the passage of cars and pedestrians is safer, and since the present invention functions autonomously without using electric power, it does not take time and effort for maintenance and can be buried in the ground. There are few restrictions.
[Brief description of the drawings]
1 is a longitudinal sectional view showing a structural example of a residual water discharge mechanism according to claim 1;
FIG. 2 is a plan view showing a structural example of a residual water discharge mechanism according to claim 1; The relief pipe and the movable valve have a cross-sectional shape.
FIG. 3 shows the same composition as FIG. 1 with the pump operating.
4 is a longitudinal sectional view showing a structural example of a residual water discharge mechanism according to claim 2. FIG.
FIG. 5 is a plan view showing a structural example of a residual water discharge mechanism according to claim 2; The valve box or the like has a cross-sectional shape.
6 shows the same composition as in FIG. 4 with the pump operating.
FIG. 7 is a schematic view showing a place where a residual water discharge mechanism according to the present invention is installed, and a shaded portion in the figure is an installation place of the mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump 2 Main pipe 3 Branch pipe 4 Nozzle 5a, 5b Escape pipe 6a, 6b Movable valve 7f, 7r Holder 8 Energizing member (spring)
9a, 9b Channel 10 Manhole 11 Cover 12 Auxiliary drain pipe 13 Valve box 14 Support point 15 Bearing 16 Arm 17 Stopper 18 Weight 19 Drain hole 20 Water guide pipe 21 Road surface 22 Side groove 23 Spoke

Claims (2)

A movable valve (6a) capable of opening and closing the flow path (9a) inside the escape pipe (5a) for draining water remaining in the main pipe (2), and a flow path (with respect to the movable valve (6a) ( 9a) and a biasing member (8) in which a biasing force acts in the opening direction, and when the pump (1) is actuated for watering, the biasing member (by the water pressure transmitted from the main pipe (2)) When the movable valve (6a) is moved in the direction against the urging force of 8) to close the flow path (9a), while the pump (1) is stopped, the pressure is reduced due to a decrease in water pressure transmitted from the main pipe (2). A watering type wherein the urging force of the urging member (8) is adjusted so that the movable valve (6a) is moved in the urging direction of the urging member (8) to open the flow path (9a). Residual water discharge mechanism for snow-melting equipment. A valve box (13) disposed in the middle of the escape pipe (5b) for draining water remaining in the main pipe (2), and the valve box (13) swings around a fulcrum (14). A movable valve (6b) that is attached to one end of the arm (16) and opens and closes the flow path (9b), and the other end of the arm (16) opens the flow path (9b) with respect to the movable valve (6b). A weight (18) on which a biasing force acts in the direction,
When the pump (1) is operated to spray water, the movable valve (6b) is moved in the direction against the urging force of the weight (18) by the water pressure transmitted from the main pipe (2), and the flow path (9b) is closed. On the other hand, when the pump (1) is stopped, the movable valve (6b) is moved in the biasing direction of the weight (18) and the flow path (9b) is opened due to a decrease in water pressure transmitted from the main pipe (2) The residual water discharging mechanism of the watering type snow-snowing device, wherein the urging force due to the weight of the weight (18) is adjusted.

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