KR200478073Y1 - Flowing backward prevention check valve - Google Patents

Abstract

By opening the tap water by the supply pressure of the tap water, it is possible to make the tap water flow in one direction, and by simplifying the structure of the opening and closing port for shutting off the tap water when the tap water supply is stopped, A check valve for preventing backflow capable of significantly reducing noises without using a spring and capable of reducing breakage and wear of parts is disclosed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for preventing backflow,

The present invention relates to a check valve for preventing backflow, and more particularly, to a check valve for preventing reverse flow, more specifically, The present invention relates to a check valve for preventing backflow which not only can be manufactured easily but has a low production cost, but also can greatly reduce noise due to not using a metal spring and also can reduce breakage and wear of parts.

Generally, tap water supplied from the main water pipe is supplied to general households or other businesses, which flows in one direction due to the pressure of water. However, when the tap water becomes singular due to the construction of the water pipe or the like, The tap water pressure is lowered due to the shutoff of the tap water and the tap water flows back to the main water pipe. This backflow of the tap water is because there is no separate device for preventing the backflow of the tap water and the backflow prevention valve is separately provided The space of the water meter is narrow and there are many limitations to apply it.

In particular, according to the standards of the waterworks facilities of the Ministry of Environment, since two backflow prevention valves are provided, the space for installation is more limited.

That is, the water meter is built in a protective box having a standard size with a small internal area. Therefore, it is difficult to install a conventional check valve having a relatively large outer shape in a narrow protective box, and an economical burden is imposed on the manufacture of the check valve by expanding the standardized protective bottle separately.

As described above, there is no check valve or the like for preventing reverse flow to the piping supplied through the main water pipe. When the water tank is installed outside the building or the house, the piping pressure suddenly There has been a problem that the tap water in the piping flows back to the main water pipe.

In particular, when tap water used in a factory or a restaurant or a hospital handling chemical substances or other dangerous substances flows back into the main water pipe, the contaminated water containing dangerous substances or various bacteria is returned to the main water pipe Thereby causing contamination of water quality.

Therefore, in recent years, a check valve has been installed at the installation site of the water meter. Such a check valve has been widely disclosed in Registration Utility Model No. 20-387266, Registration Model No. 20-332291, and the like.

However, the conventional technology has a problem in that a large number of parts are coupled to each other, which is difficult to assemble, and the number of parts is large, so that a cost burden due to production increases.

In addition, since the conventional technology uses a metal spring to automatically open and close the valve, there is a problem that noise is generated when the valve is opened and closed, and the spring is corroded or easily damaged or worn due to the flow of water there was.

The object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for controlling the flow of tap water, The present invention is to provide a check valve for preventing backflow which not only can be manufactured in a simple manner, has a low production cost, but also does not use a metal spring and can greatly reduce noise and also can reduce breakage and wear of parts.

The main object of the present invention is to provide a water meter having a female screw part connected to an outlet of a water meter and a nut part formed with a step formed with an inflow hole inside the female screw part and hollowed on the other side, A valve body composed of a coupling tube formed with a male thread portion; An opening / closing plate provided inside the connection pipe and configured to selectively open / close the inlet hole, the opening / closing plate being installed on the rear side of the step and selectively closing / opening the inlet hole while being in close contact with or falling from the rear surface of the step, A support ring portion which is spaced apart from the support ring portion by a predetermined distance and is supported inside the connection pipe and which has a discharge hole formed at the center thereof and is integrally coupled at a predetermined angle in the circumferential direction between the opening / closing plate and the support ring portion, An opening / closing part formed of an elastic spiral band which is formed in a band shape which is twisted in a shape, one end is coupled along the edge of the opening / closing plate and the other end is coupled along the edge of the support ring part, And a check valve for preventing backflow.

Here, a front receiving groove is formed in the inner surface of the front end of the connecting pipe to receive the opening / closing plate at the rear side of the inlet hole, and an outlet is formed at the rear end of the connecting pipe, A rear supporting groove is formed in the front of the supporting piece and a rear supporting groove is formed in the front of the supporting piece so that the diameter of the front receiving groove and the rear receiving groove are formed between the front receiving groove and the rear receiving groove, And an expansion duct for providing a path for discharging the water introduced into the inflow hole to the outside of the connection pipe through the discharge port while moving in the connection pipe when the inflow hole is selectively opened from the rear surface of the step, .

The support ring portion is formed with a tapered portion whose width is widened from the front end to the rear end. When the opening and closing port is inserted into the connection pipe, the opening and closing plate is received in the front receiving groove through the outlet, Preferably, the support ring portion is configured to be temporarily retracted at the discharge port by the tapered portion, guided to the rear receiving groove, passed through the discharge port, accommodated in the rear receiving groove, and then retracted to be seated and supported on the supporting piece.

According to the present invention, the check valve for preventing backflow is opened by the supply pressure of the tap water, thereby enabling the tap water to flow in one direction, and by simplifying the structure of the opening / closing port for blocking the tap water when the tap water supply is stopped, Not only the manufacturing cost is low, but also the noise can be largely reduced by not using the metal spring, and the damage and wear of the parts can be reduced.

1 is a perspective view of a check valve for preventing backflow according to the present invention,
2 is a sectional view of a check valve for preventing backflow according to the present invention,
FIGS. 3 to 4 are views for explaining the assembly of a check valve for preventing backflow according to the present invention;
5 and 6 are views for explaining the operation of the check valve for preventing backflow according to the present invention.

Hereinafter, a check valve for preventing backflow according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a check valve for preventing backflow according to the present invention, FIG. 2 is a sectional view of a check valve for preventing backflow according to the present invention, and FIGS. 3 to 4 are views for explaining assembly of a check valve for preventing backflow according to the present invention And FIGS. 5 and 6 are views for explaining the operation of the check valve for preventing backflow according to the present invention.

The check valve for preventing backflow according to the present invention is mounted on the installation site of the water meter and is opened by the supply pressure of the tap water to enable the one-way flow of the tap water. In addition, when the tap water is stopped, . Particularly, the present invention is designed to simplify the structure of the opening and closing port that is installed in the check valve to shut off the flow of tap water, thereby simplifying the manufacturing process, reducing the production cost, greatly reducing the noise, .

1 and 2, the check valve for preventing backflow according to the present invention includes a valve body 100 and an opening / closing port 200.

The valve body 100 includes a nut 110 connected to the outlet 10 of the water meter on one side and a connection pipe 120 connected to the water outlet 20 on the other side.

Specifically, the nut portion 110 has a female screw portion 111 connected to the outlet 10 of the water meter on the inner surface of one end thereof. That is, the outlet port 10 of the water meter is connected to the female threaded portion 111 of the nut portion, and the nut portion 110 is coupled to the outlet port 10 of the water meter. A step 112 having an inlet hole 112a formed at the center of the inside of the female threaded portion 111 is formed in the nut 110. That is, the step 112 is a portion in which the opening / closing plate 210 of the opening / closing port described later is closely attached, and the opening / closing plate 210 is in close contact with or falls off the step 112, 112a.

The connection pipe 120 is formed as a hollow body and is integrally formed with the nut portion 110 and has a male screw portion 121 to which the water pipe 20 is coupled. That is, the female screw portion of the water pipe 20 is fastened to the male screw portion 121 of the connection pipe, and the water pipe 20 is coupled to the connection pipe 120.

Next, the opening / closing part 200 is installed inside the connection pipe 120 to selectively open / close the inflow hole 112a. That is, the opening / closing port 200 allows the tap water to be supplied to the water outlet pipe 20 by opening the inflow hole 112a by the supply pressure of the tap water, and at the same time, when the tap water supply is stopped, The tap water is configured to shut off the tap water flow so that the tap water does not flow backward.

Concretely, the opening / closing part 200 includes an opening / closing plate 210 which is installed on the rear side of the step 112 and is in close contact with or detached from the rear surface of the step 112 to selectively open / close the inflow hole 112a. That is, the opening / closing plate 210 is configured to close or separate from the rear surface of the step 112 while moving forward and backward from the rear surface of the step 112, thereby selectively opening and closing the inlet hole 112a. The opening and closing part 200 is provided at a predetermined distance from the rear side of the opening and closing plate 210 and is supported inside the connecting pipe 120 and has a supporting ring part 220 having a discharge hole 221 formed at the center thereof. . The opening / closing part 200 includes an elastic spiral band 230 which is integrally coupled between the opening / closing plate 210 and the supporting ring part 220 at a predetermined angle in the circumferential direction. Here, the elastic spiral band 230 is formed in a band shape twisted in a helical shape, one end is coupled along the edge of the opening / closing plate 210, and the other end is coupled along the edge of the support ring 220, And the opening and closing plate 210 is elastically supported in the front-rear direction. That is, the elastic spiral band 230 is installed between the opening / closing plate 210 and the supporting ring 230, and when the opening / closing plate 210 is moved backward due to the supply pressure of the tap water, When the supply of the opening / closing plate 210 is stopped, the twist is extended to the original position, and the opening / closing plate 210 is elastically moved forward. At least two of the elastic spiral strips 230 are preferably formed at equal angles, but it is most preferable that three elastic spiral strips 230 are provided at equal angles. Also, the opening / closing part 200 is made of a synthetic resin material so that it is lightweight while maintaining a predetermined strength, does not generate rust, is not easily worn, and noise is not generated. Further, since the opening and closing port can be manufactured by integrally injecting, it is advantageous in that the manufacturing cost is low and the manufacturing is convenient.

Meanwhile, the opening / closing part 200 is configured such that the upper end and the lower end of the connecting pipe 120 are received and coupled. A front receiving groove 122 is formed in the inner surface of the front end of the connecting pipe 120 to receive the opening and closing plate 210 at the rear side of the inlet hole 112a. An annular support piece 124 having an outlet 123 formed to support and support the support ring part 220 is formed and the support ring part 220 is received in front of the support part 124 A rear receiving groove 125 is formed. That is, the opening / closing part 200 is accommodated in the front receiving groove 122 and the lower supporting ring part 220 is received in the rear receiving groove 125, 220 are seated and supported by the annular support piece 123 so that the upper end and the lower end of the opening and closing port 200 are received and coupled to the inside of the connection pipe 120.

The connection pipe 120 is formed on the inner surface of the connection pipe 120 between the front receiving groove 122 and the rear receiving groove 125 so as to be larger than the diameter of the front receiving groove and the rear receiving groove, It is preferable that the extension passage 126 is formed. That is, when the open / close plate 210 is separated from the rear surface of the step 112 and the inflow hole 112a is selectively opened, the tap water flowing into the inflow hole 112a flows into the connection pipe 120 to the space S of the elastic helical band and then to be discharged to the outside of the connection pipe 120 through the discharge port 123. [

In addition, the opening / closing part 200 is preferably constructed to be assembled in the coupling pipe 120. For this purpose, it is preferable that the support ring 220 has a tapered portion 222 having a wider width from the front end to the rear end. 3, when the door 200 is inserted into the connection pipe 120, the door 210 passes through the outlet 123 and is received in the front receiving groove 122, 4, the support ring 220 is temporarily retracted from the discharge port 123 by the tapered portion 222 and is guided to the rear receiving groove 125 to pass through the discharge port 123, 5, the supporting ring portion 220 is accommodated in the rear receiving groove 125 and then is extended and extended to be supported on the supporting piece 124. As shown in FIG.

6 and 7, the operation and action / effect of the check valve for preventing backflow according to the present invention constructed as described above will be briefly described.

First, as shown in the drawing, the check valve for preventing the backflow according to the present invention is installed between the outlet 10 of the water meter and the water outlet pipe 20 to prevent the tap water from flowing backward.

As shown in FIG. 6, when the tap water in the water pipe flows from left to right in the drawing, the opening / closing plate 210 of the opening / closing port installed in the connecting pipe 120 of the valve body, The band 230 is compressed and falls off the step 112 to open the inflow hole 112a.

The water supplied into the valve body 100 flows into the inlet hole 112a and moves through the connection pipe 120 through the extension passage 126 and the elasticity And then is discharged to the outside of the connecting pipe 120 through the discharge port 123 and supplied to the water pipe 20.

Next, as shown in FIG. 7, the flow path of the check valve is closed. This is a case in which the opening / closing plate 210 closes the inflow hole 112a so that the tap water can be prevented from flowing backward . That is, the opening / closing port 200 installed inside the connection pipe 120 is closed by closing the inflow hole 112a. If the supplied tap water becomes a unit due to the construction of the main water pipe or the like, The opening / closing plate 210 opening the inflow hole 112a by the pressure is returned to the front by the pressure of the tap water to flow backward with the returning force of the elastic spiral band 230, (112a).

Accordingly, when the flow path of the check valve is shut off due to the return of the opening / closing plate 210, the tap water supplied to the water pipe 20 flows back toward the outlet 10 of the water meter ≪ / RTI >

As described above, the check valve for preventing the backflow according to the present invention prevents the tap water from flowing back to the main water pipe through the water water meter when the water supplied to each household or other businesses is singled out. Therefore, It is possible to prevent the deterioration of the water quality caused by the water.

10: outlet of water meter 20: water outlet
100: valve body 110: nut part
120: connector 200: access door
210: opening and closing plate 220: supporting ring portion
230: Elastic spiral band

Claims (3)

And a connecting pipe having a male screw portion connected to an outlet of the water meter on one side and a nut portion formed with a step formed with an inflow hole inside the female screw portion and having a hollow portion formed on the other side and a male screw portion formed on an outer surface of the end portion, Valve body; An opening / closing plate provided inside the connection pipe and configured to selectively open / close the inlet hole, the opening / closing plate being installed on the rear side of the step and selectively closing / opening the inlet hole while being in close contact with or falling from the rear surface of the step, A support ring portion which is spaced apart from the support ring portion by a predetermined distance and is supported inside the connection pipe and which has a discharge hole formed at the center thereof and is integrally coupled at a predetermined angle in the circumferential direction between the opening / closing plate and the support ring portion, An opening / closing part formed of an elastic spiral band which is formed in a band shape which is twisted in a shape, one end is coupled along the edge of the opening / closing plate and the other end is coupled along the edge of the support ring part, , ≪ / RTI >
Wherein a front receiving groove is formed in an inner surface of a front end portion of the connecting pipe so as to receive the opening /
An annular support piece having a discharge port formed at the center of the rear end of the connection pipe and configured to support and support the support ring,
A rear receiving groove in which the supporting ring part is received is formed in front of the supporting piece,
Wherein the inner surface of the connecting tube is formed between the front receiving groove and the rear receiving groove so as to be larger than the diameter of the front receiving groove and the rear receiving groove so that when the opening plate is separated from the rear surface of the step and the inflow hole is selectively opened, And an expansion flow path is provided to provide a path for allowing the inflow water to flow through the connection pipe and to be discharged to the outside of the connection pipe through the discharge port.
delete The method according to claim 1,
The supporting ring portion is formed with a tapered portion whose width is widened from the front end to the rear end,
When the opening and closing port is inserted into the connection pipe, the opening and closing plate is received in the front receiving groove through the outlet, and the supporting ring portion is temporarily retracted at the outlet by the tapered portion, Is accommodated in the rear receiving groove and is extended and re-extended to be supported on the supporting piece.

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