KR101469829B1 - A Water Meter having Function of Preventing Backflow and Noise - Google Patents

Abstract

The present invention relates to a water meter and, more particularly, to a water meter having backflow prevention and noise reduction functions. The present invention includes a main body including an inflow pipe for water supply from one side and a discharge pipe for water discharge to the other side; an installation pipe formed to communicate with an upper portion of the discharge pipe; and a cap rotatably connected to the installation pipe and opening and closing an inlet of the discharge pipe to prevent water backflow from the discharge pipe to the main body. The installation pipe includes a rotation center section to which the cap is rotatably connected. The rotation center section includes a middle cover including a protruding portion formed at a position more apart in the inflow pipe direction than a vertical extension line of the discharge pipe inlet and generates a moment from the weight of the cap in the discharge pipe inlet direction when the water backflow is blocked with the cap in close contact with the inlet of the discharge pipe so that the cap is in closer contact with the inlet of the discharge pipe and protruding to a lower side. The protruding portion is formed of a plastic material or an elastic material so that the cap is brought into contact with the protruding portion first before being brought into contact with an inner side surface of the discharge pipe during the water supply and noise from a cap and discharge pipe collision is prevented.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water meter having a backflow prevention and noise reduction function,

The present invention relates to a water meter, and more particularly, to a water meter comprising: a main body including an inlet pipe supplied with water from one side and a discharge pipe discharging water to the other side; An installation tube communicating with an upper portion of the discharge pipe; And a stopper which is rotatably connected to the installation pipe and opens and closes the inlet of the discharge pipe to prevent water from flowing backward from the discharge pipe to the main body, the installation pipe including a rotation center portion rotatably connected to the stopper, Is formed at a position spaced apart from the vertical extension line of the discharge pipe inlet in the direction of the inlet pipe so that a moment due to the weight of the stopper is generated in the direction of the inlet of the discharge pipe when the stopper is in close contact with the inlet of the discharge pipe, And a protrusion protruding downward, wherein the protrusion is formed of a plastic material or an elastic material so that when the water is supplied, the stopper contacts the inner surface of the discharge tube So that no noise is generated due to the collision between the cap and the discharge pipe Also having an anti-reflux for locking and a sound attenuating function relates to the instrument.

Generally, the water meter is installed separately in the water supply line connected to the user side for accurately measuring the flow rate of water supplied to a user such as a home or a factory and measuring the amount of water supplied for a certain period of time.

However, there is a problem that the pressure of the piping is lowered due to various reasons such as singular water, and water such as tap water flows back to the main water pipe through the water meter. Especially, it is used in a factory, a restaurant or a hospital handling chemicals or other dangerous substances When the tap water flowing backward flows into the main water pipe, the contaminated water containing the dangerous substances and various bacteria flows back to the main water pipe, thereby polluting the water quality. In addition, when the water flows backward, the numerical value measured by the water meter becomes lower, and the amount of the supplied water can not be measured.

In order to solve these problems, a water meter having a backflow prevention function has been proposed as described in the following Patent Document, and a conventional water meter having a backflow prevention function will be described with reference to FIG. 1 to FIG. A main body 11 having an inlet pipe 111 through which the water supplied to the user is introduced into one side and a discharge pipe 113 through which the water is discharged from the other side; And a measurement tube 13 for measuring the flow rate of the fluid flowing through the discharge tube 113. A mounting tube 15 for installing the plug 17 is formed on the discharge tube 113 side. The stopper 17 is configured to open and close the inlet 113a of the discharge pipe 113 to prevent backward flow of the water. The stopper 17 is installed in the hinge groove 151a of the support portion 151 formed inside the installation pipe 15 So as to be rotatable.

(Patent Literature)

Registered Patent Publication No. 10-0706872 "A stainless steel water meter having a built-in backflow prevention cap"

Since the hinge groove 151a serving as the center of rotation of the stopper 17 lies on a vertical extension line of the inlet 113a of the discharge pipe, 17 does not generate a moment due to the weight of the plug 17 in the plug 17 when the inlet 113a of the outlet tube is blocked, no moment other than the moment caused by the flow of the water is applied. Therefore, when the supply of the water stops and the flow of the water stops, the stopper 17 is not brought into close contact with the inlet 131a of the discharge pipe, and water flows into the gap between the stopper 17 and the inlet 131a of the discharge pipe. A backflow problem occurred. The stopper 17 is connected to the support portion 151 so as to be rotatable by forming a hinge portion 171 to be inserted into the hinge groove 151a. Since the inner circumferential surface of the hinge groove 151a is not formed uniformly and it is difficult to process the hinge groove 151a into an accurate size, there is a problem that the hinge portion 171 is caught in the hinge groove 151a, The stopper 17 can not rotate properly and the backflow prevention function can not be performed.

As described above, the main body 11 of the conventional water meter is formed of a material such as brass or stainless steel. At this time, whenever the water is supplied, the cap 17 and the inner surface of the discharge tube 113 collide with each other, There was a problem that occurred.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

According to the present invention, there is provided a water purifier comprising: a main body including an inlet pipe supplied with water from one side and a discharge pipe discharging water to the other side; An installation tube communicating with an upper portion of the discharge pipe; And a stopper which is rotatably connected to the installation pipe and opens and closes the inlet of the discharge pipe to prevent water from flowing backward from the discharge pipe to the main body, the installation pipe including a rotation center portion rotatably connected to the stopper, Is formed at a position spaced apart from the vertical extension line of the discharge pipe inlet in the direction of the inlet pipe so that a moment due to the weight of the stopper is generated in the direction of the inlet of the discharge pipe when the stopper is in close contact with the inlet of the discharge pipe, And to provide a water meter having a function of preventing backflow and noise reduction so as to more closely contact the inlet of the discharge pipe.

The present invention relates to a hinge device, comprising: a hinge portion formed to protrude from both ends of an end of a cap; An opening / closing part formed to be in close contact with an inlet of the discharge pipe to open / close the inlet of the discharge pipe; And a connecting portion connecting the hinge portion and the opening and closing portion. The connecting portion is formed to be bent so that the opening and closing portion can be brought into close contact with the inlet of the discharge pipe, so that the entrance of the discharge pipe can be blocked And to provide a water meter having a function of preventing backflow and noise reduction.

The present invention is characterized in that it includes a rotation center portion including a first hinge groove formed to be embedded downward to be supported by a hinge portion so that the depth of the first hinge groove is smaller than the diameter of the hinge portion, And to provide a water meter having a function of preventing the backflow and the noise attenuation function by which the opening and closing part of the cap can smoothly open and close the inlet of the discharge pipe.

The present invention includes a middle cover covering an upper side of a cap, and the middle cover includes a second hinge groove formed to be embedded so as to cover the hinge portion, so that the rotation of the hinge portion is smooth and the hinge portion is separated from the first hinge groove And to provide a water meter having a function of preventing backflow and noise attenuation which can be prevented.

The present invention includes an intermediate cover including through holes penetrating up and down to provide a space in which the stopper can rotate without being caught by the intermediate cover when the water is supplied so that the inlet of the discharge pipe is sufficiently opened, And to provide a water meter having a function of preventing backflow and noise reduction so as to be supplied to the water meter.

The present invention is characterized in that it includes an intermediate cover including a protruding portion projecting downwardly, and the protruding portion is formed of a plastic material or an elastic material so that when the water is supplied, the stopper does not touch the inner surface of the discharge pipe, The present invention provides a water meter having a function of preventing backflow and noise attenuation that prevents noise generated by collision between a cap and a discharge pipe.

In order to achieve the object of the present invention, a water meter having a backflow prevention and noise reduction function includes the following configuration.

A water meter having a function of preventing backflow and noise reduction according to an embodiment of the present invention includes a main body including an inlet pipe supplied with water from one side and a discharge pipe discharging the water to the other side; An installation tube communicating with an upper portion of the discharge pipe; And a cap rotatably connected to the installation pipe and opening / closing an inlet of the discharge pipe to prevent the water from flowing backward from the discharge pipe toward the inflow pipe, wherein the installation pipe is connected to the cap so that the cap is rotatable And the rotation center portion is formed at a position spaced apart from the vertical extension line of the discharge pipe inlet in the direction of the inflow pipe so that the stopper is more closely attached to the inlet of the discharge pipe due to a moment due to the self weight of the stopper .

According to another aspect of the present invention, there is provided a water meter having a function of preventing a backflow and a sound attenuation, the water meter comprising: a hinge part protruding from both ends of an end of the stopper; An opening / closing part formed to be in close contact with an inlet of the discharge pipe to open / close the inlet of the discharge pipe; And a connecting part connecting the hinge part and the opening and closing part, wherein the opening and closing part is bent so as to be closely attached to the inlet of the discharge pipe.

In the water meter according to another embodiment of the present invention, the rotation center portion includes a first hinge groove formed to be downwardly inserted to rotate the hinge portion while supporting the hinge portion, The depth of the hinge groove is smaller than the diameter of the hinge portion to prevent the hinge portion from being caught in the first hinge groove.

The water meter having the function of preventing backflow and noise reduction according to another embodiment of the present invention includes an intermediate cover covering the upper side of the stopper, and the intermediate cover includes a second hinge groove formed to be covered with the hinge, So as to prevent the hinge portion from being disengaged.

In the water meter according to another embodiment of the present invention, the intermediate cover includes a through hole penetrating vertically so as to provide a space in which the stopper is freely rotatable .

In the water meter according to another embodiment of the present invention, the intermediate cover may include a protruding portion protruding downward to prevent the stopper from contacting the inner surface of the discharge pipe. .

According to another aspect of the present invention, in the water meter having the function of preventing the backflow and the noise reduction, the middle cover is formed of plastic.

The present invention can obtain the following effects by the above-described embodiment, the constitution described below, the combination, and the use relationship.

According to the present invention, there is provided a water purifier comprising: a main body including an inlet pipe supplied with water from one side and a discharge pipe discharging water to the other side; An installation tube communicating with an upper portion of the discharge pipe; And a stopper which is rotatably connected to the installation pipe and opens and closes the inlet of the discharge pipe to prevent water from flowing backward from the discharge pipe to the main body, the installation pipe including a rotation center portion rotatably connected to the stopper, Is formed at a position spaced apart from the vertical extension line of the discharge pipe inlet in the direction of the inlet pipe so that a moment due to the weight of the stopper is generated in the direction of the inlet of the discharge pipe when the stopper is in close contact with the inlet of the discharge pipe, So that it is more adhered to the inlet of the discharge pipe.

The present invention relates to a hinge device, comprising: a hinge portion formed to protrude from both ends of an end of a cap; An opening / closing part formed to be in close contact with an inlet of the discharge pipe to open / close the inlet of the discharge pipe; And a connecting portion connecting the hinge portion and the opening and closing portion. The connecting portion is formed to be bent so that the opening and closing portion can be brought into close contact with the inlet of the discharge pipe, so that the entrance of the discharge pipe can be blocked It is effective.

The present invention is characterized in that it includes a rotation center portion including a first hinge groove formed to be embedded downward to be supported by a hinge portion so that the depth of the first hinge groove is smaller than the diameter of the hinge portion, The opening and closing part of the cap can smoothly open and close the inlet of the discharge pipe.

The present invention includes a middle cover covering an upper side of a cap, and the middle cover includes a second hinge groove formed to be embedded so as to cover the hinge portion, so that the rotation of the hinge portion is smooth and the hinge portion is separated from the first hinge groove There is an effect that can be prevented.

The present invention includes an intermediate cover including through holes penetrating up and down to provide a space in which the stopper can rotate without being caught by the intermediate cover when the water is supplied so that the inlet of the discharge pipe is sufficiently opened, So that it can be supplied.

The present invention is characterized in that it includes an intermediate cover including a protruding portion projecting downwardly, and the protruding portion is formed of a plastic material or an elastic material so that when the water is supplied, the stopper does not touch the inner surface of the discharge pipe, Thereby preventing noise generated by collision between the cap and the discharge pipe.

1 is a perspective view of a conventional water meter having a backflow prevention function.
Fig. 2 is an exploded perspective view of Fig.
3 is a perspective view of a water meter according to an embodiment of the present invention.
Fig. 4 is an exploded perspective view of Fig.
5 is a cross-sectional view taken along line AA in Fig. 3
Fig. 6 is a cross-sectional view taken along the line BB in Fig. 3
Figure 7 is a bottom perspective view of the middle cover of Figure 4;
Fig. 8 is a perspective view for explaining the middle cover of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a water meter having a backflow prevention and noise reduction function according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements, rather than excluding other elements, unless specifically stated otherwise.

3 to 8, the water meter 3 includes an inlet pipe 311 for receiving water from one side, a water inlet pipe 311 for receiving water from one side, And a discharge pipe (313) for discharging the water to the other side; An installation pipe 33 formed to communicate with the upper portion of the discharge pipe 313; A stopper 35 rotatably connected to the installation pipe 33 and opening and closing the inlet of the discharge pipe 313 to prevent the water from flowing backward from the discharge pipe 313 toward the inflow pipe 311; Wherein the installation tube 33 includes a rotation center portion 331a connected to the stopper 35 such that the stopper 35 is rotatable and the rotation center portion 331a is positioned above the vertical extension of the discharge tube inlet 313a, (311), and the stopper (35) is more closely attached to the inlet (313a) of the discharge pipe due to the moment due to the weight of the stopper (35).

The main body 31 has a space for inserting a measuring unit (not shown) for measuring the flow rate of the water supplied to the user, and includes an inflow pipe 311 through which water flows as shown in FIG. 5, And a discharge pipe 313 supplied to the user. The main body 31 is preferably made of brass or stainless steel to prevent corrosion. The installation pipe 33 is formed on the discharge pipe 313 of the main body 31 and the stopper 35 is installed through the installation pipe 33 so that water flows into the discharge pipe 313. [ The inlet 313a of the discharge pipe 313 is opened and closed to prevent the water from flowing backward in the direction of the inlet pipe 311 from the discharge pipe 313. [

As shown in FIG. 4, the installation pipe 33 is formed in an upper portion of the discharge pipe 313 so as to communicate with the outside, so that the plug 35 can be installed through the installation pipe 33. The installation pipe 33 is formed to protrude inward and includes a support portion 331 for supporting the stopper 35 and a sealing cover 333 inserted to seal the installation pipe 33. The installation pipe 333, It is preferable that the sealing cover 333 is inserted into the upper inner circumferential surface of the cover 33 to form a thread.

The support portion 331 is formed on the inner surface of the installation pipe 33 and is formed on the upper portion of the discharge pipe inlet 313a through which the water flows into the discharge pipe 313. The support portion 331 includes a rotation center portion 331a connected to rotate the stopper 35 so as to open and close the inlet 313a of the discharge pipe.

The rotation center portion 331a is a portion to which the stopper 35 is rotatably connected and serves as a center of rotation at which the stopper 35 rotates. 5, the rotation center portion 331a is spaced apart from the vertical extension line L of the inlet 313a of the discharge pipe 313 by a predetermined distance from the direction of the inflow pipe 311 R). When the water is supplied, the stopper 35 is pushed by the pressure of the water to open the inlet 313a of the discharge pipe. When the supply of the water is blocked, the stopper 35 is brought into close contact with the inlet 313a of the discharge pipe by gravity, . However, when the center of rotation of the stopper 35 and the inlet 313a of the discharge pipe are in a straight line, when the stopper 35 is in contact with the inlet 313a of the discharge pipe as described in the related art, , The moment due to the weight of the plug 35 can not act. As the stopper 35 approaches the inlet 313a of the discharge pipe 35, the moment due to the weight of the stopper 35 becomes small. As a result, buoyancy acting on the stopper 35 causes the stopper 35 Is not tightly attached to the inlet 313a of the discharge pipe, and the backflow occurs continuously. 5, the rotation center portion 331a is separated from the vertical extension line L of the inlet 313a of the discharge pipe by a predetermined distance R in the direction of the inflow pipe 311 (rightward in FIG. 5) The stopper 35 is moved in the direction of the inlet 313a of the discharge pipe 31 by the weight F of the stopper 35 in the state where the stopper 35 is in contact with the inlet 313a of the discharge pipe The moment M is generated. The opening and closing part 355 of the cap 35 is brought into close contact with the inlet 313a of the discharge pipe by the moment M so that the backflow of the water through the inlet 313a of the discharge pipe can be prevented. The rotation center portion 331a may be formed by various methods such as pin coupling or hinge coupling. However, in the present embodiment, the first hinge groove 331a-1 So that the hinge portions 351 formed on both sides of the stopper 35 can be inserted and supported.

The first hinge groove 331a-1 is formed at a predetermined depth in the upper portion of the support portion 331 and is provided at both sides of the support portion 331 so that a hinge portion 351, . When the first hinge grooves 331a-1 are formed on both sides of the first hinge grooves 331a-1, the support portion 331 is formed on both sides of the stopper 35 so that the stopper 35 can rotate, Is inserted and rotated. The hinge groove 153 (see FIG. 2) is formed deep enough to fit the hinge portion 171 completely, and the main body of the water meter is made of brass or stainless steel The conventional hinge portion 171 can not be rotated by the hinge groove 153 because the cross section of the hinge groove can not be formed uniformly. I could not. 6, the depth d ₂ of the first hinge groove 331a-1 is formed to be smaller than the diameter d _{1 of} the hinge portion 351, It is possible to prevent the hinge portion 351 from being caught in the first hinge groove 331a-1 by allowing the first hinge groove 331a-1 to extend without being inserted into the first hinge groove 331a-1. Since the hinge portion 351 is covered by the second hinge groove 371 of the intermediate cover 37 to be described later, it is possible to prevent the hinge portion 351 from being separated from the first hinge groove 331a-1, Since the hinge unit 37 is formed of a plastic material, it is also possible to prevent the hinge unit 351 from being caught.

The sealing cover 333 is inserted into the upper portion of the installation pipe 33 to prevent water from leaking from the installation pipe 33 and is installed along the outer circumferential surface to be engaged with the thread formed on the inner circumferential surface of the installation pipe 33. [ Threads are formed. The hermetic cover 333 is brought into close contact with an upper portion of an intermediate cover 37 to be described later and inserted into the upper portion of the support portion 331 so that the intermediate cover 37 is fixed without moving.

4, the stopper 35 is rotatably connected to the supporter 331 and opens and closes the inlet of the discharge pipe 313 to discharge the water 351 from the discharge pipe 313 toward the inflow pipe 311, To prevent backflow. When the water is supplied to the user, the cap 35 is pushed up by the pressure of the water to open the inlet 313a of the discharge pipe. When the supply of the water is stopped, And blocks the inlet 313a. The stopper 35 includes a hinge portion 351 protruding from both ends of the stopper 35; An opening / closing part 355 formed to be in close contact with the inlet 313a of the discharge pipe to open / close the inlet 313a of the discharge pipe; And a connection portion 353 connecting the hinge portion 351 and the opening / closing portion 355.

The hinge portion 351 is formed to protrude from both ends of the connecting portion 353 and extends over the first hinge groove 331a-1 as shown in FIG. The diameter d ₁ of the hinge portion 351 is a depth of the first hinge groove 331a-1 (as shown in FIG. is larger than d ₂₎ of claim of the hinge portion 351, the first hinge groove (and to rotate freely without being caught 331a-1), the hinge portion 351 is intermediate the cover 37 to the later 2 can be stably rotated without being separated from the first hinge groove 331a-1 by being covered by the two hinge grooves 371. [

The hinge part 351 is formed on one side of the connection part 353 and the opening and closing part 355 is connected to the other side. The rotation center portion 331a which is connected to the hinge portion 351 and serves as the center of rotation of the stopper 35 is spaced from the inlet 313a of the discharge pipe by a predetermined distance in the direction of the inflow pipe 311, The connection portion 353 may be formed by bending at a predetermined point 353a so that the opening and closing portion 355 may be in close contact with the inlet 313a of the discharge pipe as shown in FIG. 5, the connecting portion 353 is formed at an angle such that the opening / closing portion 355 can be brought into close contact with the inlet 313a of the discharge pipe. In other words, since the inlet 313a of the discharge pipe is formed perpendicular to the paper surface, And is formed by bending.

As shown in FIG. 5, the opening / closing part 355 is formed at the other end of the connection part 353, and is close to the inlet 313a of the discharge pipe to prevent the water from flowing backward. The opening and closing part 355 opens and closes the inlet 313a of the outlet tube as described above and the rotational center part 331a is spaced apart from the inlet 313a of the outlet tube in the direction of the inlet tube 311, And is brought into close contact with the inlet 313a of the discharge pipe in response to a moment generated by the self weight of the stopper 35. [ The opening / closing part 355 has a disc-shaped body 355a formed to be slightly larger than the inlet 313a of the discharge pipe to block the inlet 313a of the discharge pipe; And a rubber plate 355b which is in close contact with the body 355a and is fixed by a fixing screw 355c and is inserted into the inlet 313a of the discharge tube to closely block the inlet 313a of the discharge tube .

7, the water meter 3 includes an intermediate cover 37 that covers the upper side of the stopper 35. The intermediate cover 37 can cover the hinge portion 351 A through hole 373 formed to pass through the upper and lower portions, and a protrusion 375 protruding downward. The intermediate cover 37 is seated on the upper portion of the support portion 331 and is pushed and fixed by the upper cover 333. The intermediate cover 37 is made of plastic so that the hinge portion 351 covered with the second hinge groove 371 can freely rotate and even when the stopper 35 hits the protrusion 375, It may be formed of various materials such as a material having elastic cross section which can have a smooth cross section and reduce the generation of noise.

The second hinge groove 371 is formed at a predetermined depth from the lower side of the intermediate cover 37 and is formed on both sides so as to cover the hinge portion 351 as described above, 351 are not separated from the first hinge grooves 331a-1. In addition, since the intermediate cover 37 is formed of a plastic material, the hinge portion 351 can freely rotate even when the hinge portion 351 is inserted into the second hinge groove 371.

The through hole 373 is formed so as to communicate with the upper and lower portions and is formed long left and right to provide a space in which the stopper 35 can freely rotate. The hinge portion 351 of the stopper 35 is inserted into the second hinge groove 371 and the connection portion 353 is formed by bending the stopper 35. As a result, It is necessary to provide a space in which the connecting portion 353 of the plug 35 can rotate in order to be freely rotatable. The through hole 373 is preferably long enough to allow the connection portion 353 to rotate freely until the stopper 35 touches the projecting portion 375 of the intermediate cover 37 to be described later.

The protrusion 375 protrudes downward from the other side of the intermediate cover 37 (the opposite side of the second hinge groove 371), and when the stopper 35 touches the inner surface of the discharge tube 313 The protruding portion 375 is brought into contact with the front surface of the protruding portion 375 so as to prevent noise. As described above, when the water is supplied to the user, the cap 35 is detached from the inlet 313a of the discharge pipe by the pressure of the water flowing into the discharge pipe 313, It is a serious pollution that noises are generated every time the water is supplied because the stopper 35 formed of the non-woven material collides with the discharge pipe 313 to generate a loud noises. Therefore, as shown in FIG. 8, before the stopper 35 touches the discharge pipe 313, the protrusion 375 of the intermediate cover 75 formed of plastic or elastic material is brought into contact first, Can be prevented. The through hole 373 is extended to the protrusion 375 so that the upper stopper 35 rotates to sufficiently open the inlet 313a of the discharge pipe so that the protrusion 375 And is formed to be embedded in the inner side at a certain depth due to the through hole 373.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Should be interpreted as falling within the scope of.

3: Water meter
31: Body
311: inlet pipe 313: outlet pipe 313a: outlet pipe inlet
33: Installation pipe
331: support portion 331a: rotation center portion 331a-1: first hinge groove
333: Sealed cover
35: Plug
351: hinge portion 353: connection portion 355:
37: Middle cover
371: second hinge groove 373: through hole 375:
* Prior art related codes
1: Conventional water meter
11: Body
111: inlet pipe 113: outlet pipe 113a: outlet pipe inlet
13: Measurement unit
15: installation pipe 151: support part 153: hinge groove
17: plug 171: hinge part

Claims (7)

A main body including an inflow pipe supplied with water from one side and a discharge pipe discharging the water to the other side; An installation tube communicating with an upper portion of the discharge pipe; A cap rotatably connected to the installation pipe and opening / closing an inlet of the discharge pipe to prevent the water from flowing backward from the discharge pipe toward the inflow pipe; And an intermediate cover covering an upper side of the plug,
Wherein the installation tube includes a rotation center portion to which the cap is rotatably connected,
The rotation center portion is formed at a position spaced apart from the vertical extension line of the discharge pipe inlet in the direction of the inflow pipe so that the stopper is more closely attached to the inlet of the discharge pipe due to the moment due to the self weight of the stopper,
Wherein the stopper comprises: a hinge portion formed to protrude from both ends of the end of the stopper; An opening / closing part formed to be in close contact with an inlet of the discharge pipe to open / close the inlet of the discharge pipe; And a connection portion connecting the hinge portion and the opening / closing portion,
The connection portion is formed by bending the opening / closing portion so as to be in close contact with the inlet of the discharge pipe,
Wherein the middle cover includes a second hinge groove formed to be embedded so as to cover the hinge portion, thereby preventing the hinge portion from being separated from the middle cover. delete The method according to claim 1,
Wherein the rotation center portion includes a first hinge groove formed by being embedded downward to rotate with the hinge portion being supported,
Wherein the depth of the first hinge groove is smaller than the diameter of the hinge portion to prevent the hinge portion from being caught in the first hinge groove. delete 4. The method according to any one of claims 1 to 3,
Wherein the intermediate cover includes through holes penetrating up and down to provide a space in which the stopper is freely rotatable. 4. The method according to any one of claims 1 to 3,
Wherein the intermediate cover includes a protruding portion protruding downward to prevent the stopper from contacting the inner surface of the discharge pipe. The method according to claim 6,
Wherein the intermediate cover is formed of plastic.

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