KR20240104281A - Fire hydrant underground connection device - Google Patents

Abstract

The present invention is a device for supplying water by connecting an outdoor fire hydrant on the ground and a water pipe in the ground. More specifically, the underground water pipe is connected to the underground pipe through a connecting pipe, and the underground pipe is connected to transmit water to the fire hydrant on the ground. This relates to an underground connection device for a fire hydrant that does not pollute water by trapping foreign substances such as rust remaining in the pipe and preventing them from flowing into the water pipe when backflow occurs.

Description

Fire hydrant underground connection device {Fire hydrant underground connection device}

The present invention is a device for supplying water by connecting an outdoor fire hydrant on the ground and a water pipe in the ground. More specifically, the underground water pipe is connected to the underground pipe through a connecting pipe, and the underground pipe is connected to transmit water to the fire hydrant on the ground. This relates to an underground connection device for a fire hydrant that does not pollute water by trapping foreign substances such as rust remaining in the pipe and preventing them from flowing into the water pipe when backflow occurs.

In modern society, urbanization has occurred centering on large cities, and people live and live in cities. In cities, various buildings and infrastructure facilities for housing, commerce, education, industry, transportation, and health are built to allow large populations to live comfortably. It has been built and is in operation.

Among the various infrastructure facilities built in the city, there is a water pipe buried in the ground to supply tap water to each customer, and tap water that has been disinfected, sterilized, and purified at a water purification plant is supplied to each customer through the water pipe.

In particular, one of the factors that has increased human lifespan in modern society is the supply of cleanly managed tap water. Water-borne infectious diseases such as cholera are prevented through the supply of clean tap water, and Korea's tap water is world-class in cleanliness and excellent quality. I am being recognized.

In addition, large amounts of water are required to extinguish fires in cities, and fire hydrants are installed among various infrastructure facilities to supply large amounts of water. The fire hydrant is connected to a water supply pipe buried underground, and can supply a large amount of water without interruption in times of emergency. When these fire hydrants are installed outside a building, they are installed at a certain distance and in a place where fire extinguishing vehicles can easily access them.

Fire hydrants are divided into indoor fire hydrants installed inside a building and outdoor fire hydrants installed outside the building. Outdoor fire hydrants are disaster prevention facilities that supply firefighting water needed to extinguish fires and can be maintained, repaired and used for a long time after being installed. It must be constructed with a durable structure and method, and must be easy to use in the event of a fire. It must not be exposed to risks such as freezing, damage, damage, or freezing of fire extinguishing water, and must be maintained in a state that can be used at any time.

However, many problems are found in the case of conventional outdoor fire hydrants connected to water supply. First, the water inside the hydrant is stagnant during normal times, so rotting water occurs. This is because most fire hydrants are made of iron, which is easily corroded, so residual water causes the hydrants to corrode or rust.

When extinguishing a fire, the contaminated water must first be removed and then fire-fighting water supplied to extinguish the fire. Therefore, the golden time for fire suppression is missed due to the time taken to remove the contaminated water, making initial suppression difficult.

In addition, conventional fire hydrants require constant and continuous maintenance and repair work. In normal times, rotten water contaminated with corrosion and rust inevitably occurs, so to prevent this, the water inside must be replaced at regular intervals before it deteriorates into dead water. In order to discharge rotting water, the valve of the fire hydrant must be opened at least every six months to discharge water, but in reality, performing this work continuously on a large number of fire hydrants is too much work, such as having the firefighter in charge travel and visit regularly to inspect the water. This is difficult because it causes fatigue due to excessive work.

Therefore, because the rotting water cannot be removed in time, contaminated water remains in the fire hydrant. When the fire hydrant is inspected, the water inside the hydrant flows back and flows into the water supply, contaminating the tap water supplied to each customer connected to the water supply, so each customer has to turn off the faucet. When played, red water comes out, becoming a social issue and the cause of many civil complaints.

The rust that occurs occurs because the material of fire hydrants and underground pipes is iron, and it is difficult to change the material of these fire hydrants and underground pipes because they are determined by regulations.

Therefore, a device that connects the water supply and the fire hydrant is needed to prevent contaminated water from flowing back into the water supply even if the water inside the fire hydrant is contaminated by corrosion and rust.

KR 10-2419223 (B1) 2022.07.04. KR 10-2020-0090284 (A) 2020.07.29.

In order to solve the above problems, the purpose of the present invention is to connect the underground pipe that supplies water to the fire hydrant on the ground to the water pipe through a 'U'-shaped connection pipe with a trap formed at the bottom, so that when the water inside the hydrant flows back, Since contaminants with a greater specific gravity than water are trapped in the trap and cannot rise, only water flows into the water pipe, so it does not contaminate the tap water flowing in the water pipe and provides a fire hydrant underground connection device that can supply clean tap water to each consumer.

Another object of the present invention is to provide a fire hydrant underground connection device that can improve durability and prevent contamination of tap water by minimizing corrosion and rust even if water is stagnant inside for a long time because the connecting pipe is made of stainless steel. It is done.

Another object of the present invention is to provide a check valve that controls the flow of water in only one direction at the connection between the water pipe and the connecting pipe, thereby preventing contaminated water from the fire hydrant from flowing into the water pipe and supplying clean water to each consumer. The purpose is to provide an underground connection device to a fire hydrant.

Another object of the present invention is to provide a 'U' shaped trap (primary) and a check valve (secondary) formed in the connection pipe to prevent contaminated water from the fire hydrant from flowing into the water pipe, thus preventing contamination of the water supply. The goal is to provide a fire hydrant underground connection device that minimizes the occurrence.

Another object of the present invention is to insert a balance bar integrally coupled with the opening and closing plate into the first fixing groove of the first fixture formed inside the housing and the second fixing groove of the second fixture arranged to be spaced apart from the first fixture and perpendicular to the first fixture. Since it moves back and forth in a closed state, the opening and closing plate is not distorted despite the strong water pressure flowing in from the water pipe and the elastic force of the opening and closing spring, and remains parallel to the opening and closing surface to provide a fire hydrant underground connection device that can move with accurate movement.

In order to achieve the above object, the present invention is provided with a fire hydrant 10 on the ground, a plurality of underground pipes 20 connected to the fire hydrant 10 and buried in the ground are combined with a water pipe 30, and the main valve is connected to the water pipe 30. In the device for connecting the water pipe (30) opened and closed by (31) and the underground pipe (20), the water pipe (30) is opened and closed via a branch valve (32) that controls the flow of water flowing into the water pipe (30). It is connected to the water pipe 30 and connected to the underground pipe 20 to supply water from the water pipe 30 to the underground pipe 20, and is formed in a 'U' shape to collect contaminants 11 at the bottom. This stagnation includes a connecting pipe 100 provided with a trap 110.

In addition, the present invention relates to a fire hydrant in which the main valve 31 is closed, the water pressure of the water pipe 30 decreases, the branch valve 32 is opened, and the water pipe 30 and the connection pipe 100 are connected. After the contaminants 11 generated inside (10) are moved to the trap 110, they are trapped in the trap 110 and do not flow into the water pipe 30.

In addition, the present invention is provided between the branch valve 32 and the connection pipe 100, and is provided with a check valve 200 that controls water to flow only from the water pipe 30 to the fire hydrant 10. .

In addition, the check valve 200 of the present invention has an inlet 211 through which water flows from the water pipe 30 on one side, and an outlet 212 connected to the connection pipe 100 on the other side. housing (210); An opening and closing surface 224 that is opened and closed by an opening and closing plate 221 disposed inside the housing 210 is formed, and an opening and closing part (222) is provided with an opening and closing spring 222 that is coupled to the opening and closing plate 221 and moves. 220); And a balance bar 235, one end of which is coupled to the opening and closing plate 221, is provided, and a first fixture 231 is formed inside the housing 210 to hold the balance bar 235, It includes a fixing unit 230 provided with a second fixing unit 233 that is spaced apart from the first fixing unit 231 and is orthogonal to each other.

In addition, when the balance bar 235 of the present invention is inserted into the first fixing groove 232 formed on the first fixing base 231 and the second fixing groove 234 formed on the second fixing base 233, hydraulic pressure and It moves integrally with the opening and closing plate 221, which reciprocates by the stretching force of the opening and closing spring 222.

In addition, the present invention further includes a balance spring 236 fitted on the outer surface of the balance bar 235, one end of which is supported by the second fixture 233, and the other end of which is supported by the opening and closing plate 221.

In addition, the elastic force of the balance spring 236 of the present invention is formed to be lower than that of the opening and closing spring 222.

In the fire hydrant underground connection device according to the present invention, the underground pipe that supplies water to the fire hydrant on the ground is connected to the water pipe through a 'U'-shaped connection pipe with a trap formed at the bottom, so that when the water inside the hydrant flows back, its gravity is higher than that of the water. Since these large contaminants are trapped in the trap and cannot rise, only water flows into the water pipe, so it does not pollute the tap water flowing in the water pipe and has the effect of supplying clean tap water to each customer.

In addition, the present invention has the effect of improving durability and preventing contamination of tap water by minimizing corrosion and rust even if water is stagnant inside for a long time because the connecting pipe is made of stainless steel.

In addition, the present invention has the effect of supplying clean water to each consumer by preventing contaminated water from the fire hydrant from flowing into the water pipe by providing a check valve that controls the flow of water in only one direction at the connection between the water pipe and the connecting pipe. There is.

In addition, the present invention is equipped with a 'U'-shaped trap (primary) and a check valve (secondary) formed in the connecting pipe to prevent contaminated water from the fire hydrant from flowing into the water pipe, thereby preventing contamination of the water supply. It has the maximum suppressive effect.

In addition, the present invention is a state in which a balance bar integrally coupled with the opening and closing plate is inserted into the first fixing groove of the first fixture formed inside the housing and the second fixing groove of the second fixture spaced apart from the first fixture and arranged to be perpendicular to the first fixture. Because it moves back and forth, the opening and closing plate is not distorted despite the strong water pressure flowing in from the water pipe and the elastic force of the opening and closing spring, and is maintained parallel to the opening and closing surface, resulting in accurate movement.

Figure 1 is a plan view showing a state in which the fire hydrant underground connection device of the present invention is connected to a water pipe.
Figure 2 is a side view of the fire hydrant underground connection device of the present invention.
Figure 3 is a side cross-sectional view showing the flow of water inside the connection pipe in the fire hydrant underground connection device of the present invention.
Figure 4 is a cross-sectional perspective view showing a check valve in the fire hydrant underground connection device of the present invention.
Figure 5 is a partial enlarged view of the area "A" in Figure 4.
Figure 6 is a side cross-sectional view of the check valve in an open state in the fire hydrant underground connection device of the present invention.
Figure 7 is a side cross-sectional view of the check valve in a closed state in the fire hydrant underground connection device of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement them.

As shown in Figures 1 to 7, the fire hydrant underground connection device according to the present invention prevents the inflow into the water pipe 30 even if contaminated water is generated due to corrosion and rust as the water inside the fire hydrant 10 becomes old. As a device to prevent,

A fire hydrant 10 is provided on the ground, and a plurality of underground pipes 20 connected to the fire hydrant 10 and buried in the ground are combined with a water pipe 30, and the water pipe is opened and closed by the main valve 31. In the device connecting (30) and the underground pipe (20) to each other,

It is connected to the water pipe 30 via a branch valve 32 that controls the flow of water flowing from the water pipe 30, and is connected to the underground pipe 20 to transfer water from the water pipe 30 to the underground pipe. It includes a connecting pipe 100 that is supplied to the pipe 20 and is formed in a 'U' shape and is provided with a trap 110 at the bottom in which contaminants 11 accumulate.

Among the infrastructure built in the city, the water pipe 30 is usually installed buried in the ground, and the water flowing along the water pipe 30 is supplied to each consumer as tap water. And when a fire breaks out and the fire is extinguished, water from the water pipe 30 is used through the fire hydrant 10 connected to the water pipe 30.

The water pipe 30 connects the water pipe 30 and each customer with a water supply pipe 33 buried in the ground to supply water to each customer, and is buried in the ground to supply water to the fire hydrant 10 installed on the ground. The connection pipe 100 connects the water pipe 30 and the underground pipe 20 in communication with the fire hydrant 10. The underground pipe (20) is a pipe that is buried in the ground and transmits water to the fire hydrant (10) on the ground.

In normal times when a fire does not occur, the water in the water pipe 30 is supplied to each customer through the water supply pipe 33 and used as tap water. When a fire occurs, the fire extinguisher connects the hose pipe to the fire hydrant 10 to supply water. The constant water of the pipe (30) flows to the connecting pipe (100) > underground pipe (20) > fire hydrant (10) > hose pipe and is used for fire suppression.

However, in the conventional fire hydrant 10, water accumulates inside the fire hydrant 10 during normal times when a fire does not occur, and the fire hydrant 10 made of iron corrodes and rusts, causing the water inside to be contaminated by corrosion and rust. .

Conventionally, when inspecting the fire hydrant (10), contaminated water stagnating inside the fire hydrant (10) for a long time flows back into the water pipe (30), and this contaminated water is supplied to each customer through the water supply pipe (33). ), causing great inconvenience to tap water users.

Therefore, in order to prevent contaminated water inside the fire hydrant 10 from flowing into the water pipe 30, the present invention has a fire hydrant 10 installed on the ground, and an underground pipe 20 that transmits water to the fire hydrant 10 is installed in the ground. It is buried in and the underground water pipe 30 is connected to the underground pipe 20 through a 'U' shaped connecting pipe 100.

The connecting pipe 100 is provided with a trap 110 at the bottom, so that the contaminants 11 accumulate in the trap 110 and do not escape, thereby preventing the contaminants 11 from flowing into the water pipe 30. Contaminants (11) generated by corrosion and rust inside the fire hydrant (10) flow back from the fire hydrant (10) to the water pipe (30), but do not pass through the trap (110) and accumulate, leading to the water pipe (30). Since it does not flow in, the water flowing through the water pipe 30 is kept clean and clean tap water can be supplied to each consumer.

Referring to FIG. 1, the water pipe 30 is a pipe through which purified water flows from a specific water treatment facility to supply clean tap water to each consumer in the city, and is buried and installed in the ground. The water flowing along the water pipe 30 branches off into the water supply pipe 33 to supply clean tap water to each customer, such as a building or factory.

In addition, the water pipe 30 is connected to a fire hydrant 10 installed outdoors. The fire hydrant 10 is installed on the ground, so that when extinguishing a fire, the user connects the hose pipe to the fire hydrant 10 to provide water. Water from the pipe (30) is supplied and used as fire-fighting water. The fire hydrant 10 is usually provided as an above-ground type for easy identification so that it is easily visible, but it can also be provided as an underground type that is used by opening a manhole cover and a lift type that goes up and down between the ground and underground.

The water supply pipe 33 that supplies water (tap water) to each customer and the fire hydrant 10 that is used as firefighting water share the water pipe 30.

The water pressure of the water pipe 30 is maintained higher than the water pressure inside the water pipe 33 and the fire hydrant 10, and the water flowing along the water pipe 30 flows from the water pipe 30 to the water supply pipe 33. Or, it flows toward the fire hydrant (10).

The water pipe 30 is provided with a plurality of main valves 31 that open and close the water pipe 30, and when it is desired to control the flow of water in a specific area, the main valve corresponding to that area ( 31) can be controlled by manipulating it. This control is preferably performed for a short period of time so as not to cause significant inconvenience to the user when the water pipe 30 is inspected or requires maintenance.

A branch valve 32 is further provided at a point where the water pipe 30 branches off to the fire hydrant 10. The branch valve 32 is a valve that controls the flow of water flowing from the water pipe 30 toward the fire hydrant 10. When the branch valve 32 is closed, water from the water pipe 30 does not flow toward the fire hydrant 10, or water from the fire hydrant 10 does not flow toward the water pipe 30.

It is desirable that the branch valve 32 is always open in normal times to allow water from the water pipe 30 to flow into the fire hydrant 10. Since the branch valve 32 is open, when a fire occurs, water from the water pipe 30 flows into the fire hydrant 10 to extinguish the fire.

The branch valve 32 can be closed when inspecting or maintaining the fire hydrant 10. Inspection and maintenance of the fire hydrant (10) are performed while the branch valve (32) is closed to prevent water from the water pipe (30) from flowing into the fire hydrant (10).

In addition, the branch valve 32 may be further provided at a point where the water pipe 30 flows into the water supply pipe 33. However, it is not shown in the drawings of the present invention and description is omitted.

Normally, when the main valve 31 and the branch valve 32 are open, the water pressure is highest in the water pipe 30, and water flows from the water pipe 30 toward the fire hydrant 10 and the water supply pipe 33. Water flows through

However, when the main valve 31 is closed, water flowing into the water pipe 30 is blocked and the water pressure inside the water pipe 30 decreases. The main valve 31 is closed at a low frequency, and if the water inside the fire hydrant 10 is not used and stagnates for a long time, contaminated water is generated due to corrosion and rust of the fire hydrant 10. At this time, when the branch valve 32 is opened and the water from the fire hydrant 10 flows into the water pipe 30, the contaminated water is mixed with the water, and the contaminated water is supplied to each customer through the water supply pipe 33, causing rust. This came out.

Therefore, the present invention is such that even when the main valve 31 is closed and the water pressure of the water pipe 30 drops and the branch valve 32 is open, the contaminated water existing on the fire hydrant 10 flows into the water pipe 30. In order to block this, a 'U' shaped connection pipe 100 is provided as shown in FIGS. 2 and 3. One end of the connection pipe 100 is connected to the water pipe 30 through the branch valve 32, and the other end is connected to the underground pipe 20.

The fire hydrant 10 on the ground is connected to an underground pipe 20 buried in the ground, and the underground pipe 20 is connected to the water pipe 30 through a connection pipe 100. The fire hydrant 10 is made of iron, which is a material that is vulnerable to corrosion. If water accumulates, rust occurs and mixed with the water inside, generating contaminated water.

As the water pressure of the water pipe 30 drops, the contaminated water accumulated inside the fire hydrant 10 flows back toward the water pipe 30. As it passes through the connection pipe 100, the contaminants 11 contained in the water are filtered out. Lose.

The connection pipe 100 is provided with a trap 110 at the bottom of the 'U' shaped portion, and pipes are formed horizontally on both sides of the trap 110. Contaminated water present inside the fire hydrant (10) flows backwards, passes through the underground pipe (20), flows through one side of the connecting pipe (100) - a horizontal pipe connected to the underground pipe (20) - and enters the trap (110). It flows downward, but the contaminants 11 contained in the water cannot rise due to their higher specific gravity than water and remain in the trap 110.

When water flows back from the inside of the fire hydrant (10) toward the water pipe (30), the water flows back toward the water pipe (30) under pressure due to the weight of the water due to the height from the water pipe (30) to the fire hydrant (10). Since this is not much larger, the reverse flow speed of water is not fast. Therefore, the contaminants 11 descend and flow into the trap 110 from one side of the connecting pipe 100 along the countercurrent flow, but overcome the specific gravity of the contaminants 11 and flow from the trap 110 to the connecting pipe 100. Since it does not receive pressure to rise to the other side - the horizontal pipe connected to the water pipe 30 - it accumulates in the trap 110.

Contaminants 11, which have a greater specific gravity than water, are trapped in the trap 110 and cannot escape, and only water rises to the other side of the connection pipe 100 and flows into the water pipe 30. Therefore, since the water flowing in the water pipe 30 has the contaminants 11 filtered out, the water (tap water) flowing in the water pipe 30 is not polluted.

Since the flow of water flowing back from the fire hydrant 10 toward the water pipe 30 is not strong, a trap 110 is further formed in the connection pipe 100 to trap the contaminants 11 in the trap 110, thereby trapping the contaminants 11 in the water pipe 30. ) is to prevent contamination of water flowing in the water.

The water flowing from the water pipe (30) toward the fire hydrant (10) remains inside the fire hydrant (10), the underground pipe (20), and the connecting pipe (100). As the distance increases, the amount of accumulated water increases. The more water there is, the more rust may occur. In the present invention, in order to prevent rust from occurring in the connection pipe 100, the connection pipe 100 is made of a stainless steel material.

As the distance between the water pipe 30 and the fire hydrant 10 increases, the length of the connecting pipe 100 must be longer, thereby increasing the generation of contaminants 11 such as corrosion and rust caused by stagnant water. However, since the connecting pipe 100 is made of stainless steel, corrosion and rust are suppressed even if the amount of stagnant water increases.

The water inside the connection pipe 100 made of stainless steel does not rust, and if water remains in the fire hydrant 10 made of strong hard iron for a long time, contaminants 11 may be generated. However, the amount of contaminants 11 generated in the fire hydrant 10 and contaminating the water is limited, and the generation of contaminants 11 is suppressed in the connection pipe 100 due to the stainless steel material, so the contamination received by the trap 110 is limited. Substance 11 is in small quantities. Therefore, the size of the trap 110 of the connection pipe 100 can be made small, which improves economical efficiency and efficiency by minimizing soil excavation work at the buried location of the connection pipe 100.

As shown in Figures 2 to 7, a branch valve 32 that controls the inflow of water from the water pipe 30 to the fire hydrant 10 at the point where the connection pipe 100 is connected to the water pipe 30. is provided, and a check valve 200 is further provided between the branch valve 32 and the connection pipe 100. The check valve 200 is a valve that allows water to flow in only one direction.

The check valve 200 controls water to flow only from the water pipe 30 to the fire hydrant 10 and blocks water from flowing into the water pipe 30 from the hydrant 10. Therefore, the corrosion and rust contaminants 11 generated from the fire hydrant 10 do not flow into the water pipe 30 and there is no fear of contaminating the water supply.

With reference to FIGS. 4 to 7, the check valve 200 is

A housing 210 in which an inlet 211 through which water flows from the water pipe 30 is formed on one side, and an outlet 212 connected to the connection pipe 100 is formed on the other side;

An opening and closing surface 224 that is opened and closed by an opening and closing plate 221 disposed inside the housing 210 is formed, and an opening and closing part (222) is provided with an opening and closing spring 222 that is coupled to the opening and closing plate 221 and moves. 220); and

A balance bar 235, one end of which is coupled to the opening and closing plate 221, is provided, and a first fixture 231 is formed inside the housing 210 to hold the balance bar 235, and the It includes a fixing unit 230 provided with a second fixing unit 233 that is spaced apart from the first fixing unit 231 but is orthogonal to each other.

The housing 210 receives water from the water pipe 30 through the inlet 211 formed on one side, and the water flowing inside the housing 210 flows through the discharge port 212 formed on the other side of the housing 210. It exits through and flows into the connection pipe (100).

Water passing through the check valve 200 flows only in the direction from the inlet 211 toward the outlet 212, and no flow occurs from the outlet 212 toward the inlet 211. This is because the opening and closing part 220 that opens and closes the internal space of the housing 210 controls the flow of water, and the opening and closing part 220 is inside the housing 210 due to the pressure of water from the inlet 211 to the outlet 212. It operates to open the space, and when the water flow is directed from the discharge port 212 to the inlet port 211, it operates to close the inside of the housing 210.

The opening and closing part 220 includes a disc-shaped opening and closing plate 221 provided inside the housing 210, and an opening and closing surface 224 that is the inner surface of the housing 210 that is selectively opened and closed by movement of the opening and closing plate 221. It includes an opening and closing spring 222 that is coupled to the opening and closing plate 221 to provide elastic force to the opening and closing plate 221, and an opening and closing rib 223 that secures the opening and closing spring 222 to the housing 210.

The opening and closing spring 222 is disposed on the central axis of the inner space of the housing 210, and the opening and closing rib 223 fixes the opening and closing spring 222. The opening and closing ribs 223 are formed with a thin thickness so that fluid passes between the opening and closing ribs 223.

The opening and closing spring 222 pushes the opening and closing plate 221 with stretching force so that the opening and closing plate 221 closes the opening and closing surface 224. The direction of the force by which the opening and closing spring 222 pushes the opening and closing plate 221 is from the discharge port 212 to the inlet port 211.

The opening and closing plate 221 is selectively in contact with the stepped opening and closing surface 224 formed on the inner surface of the housing 210, and the opening and closing plate 221 moves toward the inlet 211 due to the stretching force of the opening and closing spring 222. When moving toward it, the opening/closing surface 224 is closed and fluid cannot flow.

When water flows into the inlet 211 connected to the water pipe 30, the opening and closing plate 221 receives water pressure and opens the opening and closing surface 224. The elastic force of the opening and closing spring 222 is formed to be lower than the water pressure of the water pipe 30, so that the strong water pressure generated in the water pipe 30 presses the surface of the opening and closing plate 221 to open the opening and closing spring ( 222) acts to compress.

When the main valve 31 is opened and a normal range of water pressure is formed in the water pipe 30, water passes through the open branch valve 32 and flows from the water pipe 30 toward the fire hydrant 10. By overcoming the elastic force of the opening and closing spring 222 and pushing the opening and closing plate 221, the opening and closing surface 224 and the opening and closing plate 221 are separated. Water flows in between the opening and closing plate 221 and the opening and closing surface 224 and is supplied toward the fire hydrant (10).

As the main valve 31 is closed and the water pressure in the water pipe 30 gradually decreases, the water on the hydrant 10 side flows back toward the water pipe 30, and the water pressure in the water pipe 30 decreases. When the elastic force of the opening/closing spring 222 becomes lower than that of the opening/closing spring 222, the opening/closing spring 222 pushes the opening/closing plate 221 toward the opening/closing surface 224 to make contact, thereby closing the inner space of the housing 210 to prevent water from flowing back. .

The elastic force of the opening and closing spring 222 is weaker than the water pressure when the normal water pressure of the water pipe 30 is maintained, but is stronger than the water pressure when the water pressure of the water pipe 30 drops abnormally, so that the fire hydrant (10) Before the water on the ) side flows back into the water pipe 30, the opening/closing spring 222 pushes the opening/closing plate 221 into contact with the opening/closing surface 224, thereby closing the inside of the housing 210. That is, even if the water pressure in the water pipe 30 drops, the housing 210 of the check valve 200 is sealed before the water on the hydrant 10 side flows back into the water pipe 30.

A balance bar 235 is coupled to the center of the opening and closing plate 221. The balance bar 235 has a length in the direction of water flow in the check valve 200, and one end is coupled to the center of the opening and closing plate 221.

The balance bar 235 is supported by a first fixture 231 and a second fixture 233 formed inside the housing 210. The first fixture 231 and the second fixture 233 are structures that protrude toward the central axis of the housing 210 and are formed in a rib shape. The first fixture 231 and the second fixture 233 are formed to be spaced apart from each other, but the first fixture 231 is located closer to the inlet 211 than the second fixture 233, and the second fixture 233 ) is located closer to the discharge port 212 than the first fixture 231.

A first fixing groove 232 through which the balance bar 235 penetrates is formed in the center of the first fixture 231, and a second fixing groove 232 through which the balance beam 235 penetrates is formed in the center of the second fixture 233 ( 234) is formed. That is, the balance beam 235 passes through the first fixing groove 232 and the second fixing groove 234 at the same time.

When the opening and closing plate 221 reciprocates by the water pressure and the stretching force of the opening and closing spring 222, the balance bar 235 also reciprocates integrally with the opening and closing plate 221 and the first fixing groove 232. and reciprocates in the second fixed groove (234).

A balance spring 236 is fitted to the outer surface of the balance bar 235. One end of the balance spring 236 is supported by the second fixture 233 and the other end is supported by the opening and closing plate 221. When the opening and closing plate 221 moves from the discharge port 212 side to the inlet 211 and closes the inside of the housing 210, the balance spring ( 236) has a buffering effect. The elasticity of the balance spring 236 is lower than that of the opening and closing spring 222, and when the water pressure of the water pipe 30 is lower than the elasticity of the opening and closing spring 222, the opening and closing spring 222 expands and the balance spring (236) is compressed.

The first fixture 231 and the second fixture 233 are arranged to be spaced apart from each other but perpendicular to each other. For example, when the second fixture 233 is arranged vertically, the first fixture 231 is arranged horizontally at a position spaced apart from the second fixture 233.

Since the water pressure of the water pipe 30 is strong, when the opening and closing plate 221 is pressed with the water pressure, the opening and closing plate 221 cannot maintain a parallel position to the opening and closing surface 224 and is twisted. Force is received, and the first and second fixtures 231 and 233, which hold the balance beam 235, withstand and absorb this force. The second fixture 233 arranged in the vertical direction mainly absorbs the force of the opening and closing plate 221 being twisted in the vertical direction, and the first fixture 231 arranged in the horizontal direction mainly keeps the opening and closing plate 221 horizontal. Absorbs force that tends to twist in one direction. Therefore, even if the opening and closing plate 221 is subjected to strong hydraulic pressure, it can maintain a position parallel to the opening and closing surface 224, and the opening and closing plate 221 is attached to the first and second fixing grooves 232 and 234. The reciprocating movement is guided by the inserted balance beam 235. Therefore, the opening and closing plate 221 can withstand the strong water pressure flowing from the water pipe 30 and the stretching force of the opening and closing spring 222 and move with accurate operation.

The operation of an embodiment of the fire hydrant underground connection device of the present invention will be described with reference to FIGS. 2, 3, 6, and 7.

With the main valve (31) open, water maintains normal water pressure through the water pipe (30) and is supplied to each customer through the water supply pipe (33), and with the branch valve (32) open, the connecting pipe (100) ) and is supplied to the fire hydrant (10) through the underground pipe (20). The normal water pressure of the water pipe 30 is stronger than the water pressure inside the water supply pipe 33 and the fire hydrant 10, so water flows in the direction from the water pipe 30 toward the water supply pipe 33 and the fire hydrant 10. If the fire hydrant 10 is not used, the water inside remains stagnant for a long time, and as the inside of the fire hydrant 10 corrodes and rusts, the water inside becomes contaminated with contaminants 11. At this time, since the connecting pipe 100 is made of stainless steel, there are no contaminants 11 due to corrosion or rust occurring within it.

When the fire hydrant (10) needs to be inspected or repaired, the branch valve (32) is opened and the water pipe (30) and the connection pipe (100) are connected, and the main valve (31) is closed to open the water pipe (30). When closed, the water pressure in the water pipe 30 gradually decreases, and the water inside the fire hydrant 10 flows back toward the water pipe 30. Contaminants (11) also pass from the fire hydrant (10) through the underground pipe (20) and come down toward the connection pipe (100).

Contaminants 11 moving along the connection pipe 100 pass through the trap 110 while heading toward the water pipe 30. They descend and enter the trap 110, but rise from the trap 110 and enter the water pipe 30. It does not head towards the pipe (30). This is because the contaminant 11 has a higher specific gravity than water, so it sinks in the trap 110 and the flow rate of water flowing back is slow, so the contaminant 11 lacks the power to rise from the trap 110.

Therefore, the contaminants 11 are trapped in the trap 110 and only water flows into the water pipe 30 through the open branch valve 32, so it does not contaminate the water flowing along the water pipe 30.

In an embodiment in which the fire hydrant underground connection device of the present invention further includes a check valve 200 between the branch valve 32 and the connection pipe 100, the initial state of the check valve 200 is that of the water pipe 30. The opening and closing plate 221 is pressurized by normal water pressure and moves toward the discharge port 212, and the opening and closing spring 222 is compressed, thereby forming a space between the opening and closing plate 221 and the opening and closing surface 224, thereby forming a flow path. When the opening and closing plate 221 moves toward the discharge port 212 under hydraulic pressure, the balance bar 235 is supported and guided by the first and second fixtures 231 and 233, so that the balance bar 235 and The combined opening and closing plate 221 reciprocates while being parallel to the opening and closing surface 224.

By closing the main valve 31, the water pressure in the water pipe 30 gradually decreases, and when the water pressure becomes lower than the elastic force of the opening and closing spring 222 provided inside the check valve 200, the opening and closing plate 221 opens and closes. Move towards face (224). Even if the water pressure in the water pipe 30 is lowered, it is preferable that it remains higher than the water pressure on the hydrant 10 so that the direction of water flow is from the inlet 211 to the discharge port 212. As the balance bar 235 moves toward the inlet 211, it is supported and guided by the first fixture 231 and the second fixture 233, and the balance spring 236 supports the opening and closing plate 221 to cushion it. .

After the opening and closing surface 224 is closed by the opening and closing plate 221, the water flow from the fire hydrant 10 toward the water pipe 30 is blocked, so the contaminants 11 generated in the fire hydrant 10 are discharged into the water pipe ( 30) and does not contaminate water supply.

10: Fire hydrant 11: Pollutants 20: Underground pipe
30: Water pipe 31: Main valve 32: Branch valve 33: Water supply pipe
100: Connecting pipe 110: Trap
200: Check valve
210: Housing 211: Inlet 212: Discharge port
220: Opening and closing part 221: Opening and closing plate 222: Opening and closing spring 223: Opening and closing rib 224: Opening and closing surface
230: Fixing unit 231: First fixing unit 232: First fixing groove 233: Second fixing unit 234: Second fixing groove
235: Balance beam 236: Balance spring

Claims (7)

A fire hydrant 10 is provided on the ground, and a plurality of underground pipes 20 connected to the fire hydrant 10 and buried in the ground are combined with a water pipe 30, and the water pipe is opened and closed by the main valve 31. In the device connecting (30) and the underground pipe (20) to each other,
It is connected to the water pipe 30 via a branch valve 32 that controls the flow of water flowing from the water pipe 30, and is connected to the underground pipe 20 to transfer water from the water pipe 30 to the underground pipe. A connecting pipe 100 that is supplied to the pipe 20 and is formed in a 'U' shape and is provided with a trap 110 in which contaminants 11 accumulate at the bottom.
Fire hydrant underground connection device.
According to paragraph 1,
In a state where the main valve 31 is closed and the water pressure of the water pipe 30 is reduced and the branch valve 32 is opened and the water pipe 30 and the connection pipe 100 are connected, the fire hydrant 10 After the contaminants (11) generated internally are moved to the trap (110), they are trapped in the trap (110) and do not flow into the water pipe (30).
Fire hydrant underground connection device.
According to paragraph 1,
A check valve 200 is provided between the branch valve 32 and the connection pipe 100 and controls water to flow only from the water pipe 30 to the fire hydrant 10.
Fire hydrant underground connection device.
According to clause 3,
The check valve 200 is
A housing 210 in which an inlet 211 through which water flows from the water pipe 30 is formed on one side, and an outlet 212 connected to the connection pipe 100 is formed on the other side;
An opening and closing surface 224 that is opened and closed by an opening and closing plate 221 disposed inside the housing 210 is formed, and an opening and closing part (222) is provided with an opening and closing spring 222 that is coupled to the opening and closing plate 221 and moves. 220); and
A balance bar 235, one end of which is coupled to the opening and closing plate 221, is provided, and a first fixture 231 is formed inside the housing 210 to hold the balance bar 235, and the A fixing unit 230 provided with a second fixing unit 233 that is spaced apart from the first fixing unit 231 and is orthogonal to each other.
Fire hydrant underground connection device.
According to clause 4,
With the balance bar 235 inserted into the first fixing groove 232 formed on the first fixing base 231 and the second fixing groove 234 formed on the second fixing base 233, water pressure and the opening and closing spring ( Moving integrally with the opening and closing plate 221, which reciprocates by the stretching force of 222)
Fire hydrant underground connection device.
According to clause 4,
A balance spring 236 is inserted into the outer surface of the balance bar 235, one end of which is supported by the second fixture 233, and the other end of which is supported by the opening and closing plate 221.
Fire hydrant underground connection device.
According to clause 6,
The elastic force of the balance spring 236 is formed to be lower than the elastic force of the opening and closing spring 222.
Fire hydrant underground connection device.