JPH0853863A - Water-supply installation with drain mechanism - Google Patents

Abstract

PURPOSE:To perform complete and easy drainage of a water-supply installation by a method wherein a check valve to block a water flow in the direction toward the discharge port and cause the flow of water in the direction toward the feed source is located between the feed source and the discharge port. CONSTITUTION:A drain valve 3 is connected to a feed source 1 to feed water and/or hot water, a main valve 4 is connected to the drain valve 3 through a feed pipe 2, and a discharge port 6 is connected to the main valve 4 through a discharge pipe 5. The feed pipe 2 and the discharge pipe 5 are made to communicate with each other through a bypass piping 10 in the middle of which a check valve 9 to block a water flow in the direction of the discharge port 6 and effect the flow of water in the direction of the feed source 1 is located. The drain valve 3 is arranged in the vicinity of the feed source 1. The drain valve 3 is located at the lowermost part of the feed pipe 2 and the discharge pipe 5. A vertical flow passage 13 in the middle of which a down valve seat 12 is formed is installed in the check valve 9 and a valve body 15 is vertically slidably fitted in a flow passage 13 below the valve seat 12. A plurality of flow grooves 14 are formed in the inner peripheral surface of the flow passage 13 below the valve seat 12. Through upward slide of the valve body 15, the valve seat 12 is opened and through downward slide of the valve body 15, the valve seat 12 is opened. Buoyancy to energize upward the valve body 15 is exerted on the valve body 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device with a water draining mechanism.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Laid-Open No. 5-222747, in order to eliminate residual water in the spout, an inlet passage opening to the water supply side and an opening to the spout side are formed below the spout. An outlet passage and an escape passage open to the outside are formed, and a relief valve having a valve body that operates by water pressure from the main valve is provided inside, and when the main valve opens, the relief passage is closed and the water discharge port is opened. There is one in which the water is discharged from the main valve and the relief passage is opened when the main valve is closed so that the water remaining between the relief valve and the spout is discharged from the relief passage to the outside.

[0003]

However, in order to prevent water from freezing, it is necessary to drain water from the primary side pipe between the water supply pipe and the main valve, but in the above-mentioned prior art, the drainage of FIG. Since the relief valve a is provided on the downstream side of the main valve b as shown in FIG. 3, water between the water outlet c and the relief valve a can be drained, but between the main valve b and the relief valve a. Water remains, which is insufficient for draining water to prevent freezing.

[0004]

According to the present invention, a water supply pipe connected to a water supply source for supplying water and / or hot water is branched,
The main valve connected to the water outlet through the water discharge pipe is connected to one branch end, the drain valve connected to the drain pipe is connected to the other branch end, and the water supply between the drain valve and the main valve is connected. A first branch portion is formed in the pipe, a second branch portion is formed in the water discharge pipe between the main valve and the water outlet, and the first branch portion and the second branch portion are separated from the first branch portion midway. A water supply device with a water draining mechanism, characterized in that a water flow to the second branch part is blocked, and the second branch part communicates with the first branch part by a bypass passage provided with a check valve for allowing water to flow therethrough. Is intended to be provided.

It also has the following features.

The water drain valve is provided in the vicinity of the water supply source. The water drain valve is provided at the bottom of the water supply pipe and the water discharge pipe.

Inside the check valve, a vertical flow passage having a downwardly facing valve seat is provided, and a valve body is vertically slidably fitted in the flow passage below the valve seat and the valve seat is seated. A plurality of flow grooves are formed on the inner peripheral surface of the lower flow path, and the valve seat is closed by sliding the valve body upward, and the valve seat is opened by sliding the valve body downward. At the same time, buoyancy is applied to the valve body to urge the valve body upward.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the construction of a water supply apparatus B equipped with a water draining mechanism A according to the present invention. A water drain valve 3 is connected in the middle of a water supply pipe 2 connected to a water supply source 1. The main valve 4 is connected to the end of 2, the start end of the water discharge pipe 5 is connected to the main valve 4, and the water discharge port 6 is opened at the end of the water discharge pipe 5.

The water supply pipe 2 between the main valve 4 and the water drain valve 3
The first and second branch parts 7 and 8 are provided in the water discharge pipe 5 and the water discharge pipe 5, respectively, preferably close to the main valve 4, and the first and second branch parts are provided.
7 and 8 are connected to each other by a bypass pipe 10 having a check valve 9 for preventing water flow from the water supply pipe 2 toward the water discharge pipe 5 in the middle, but allowing water to flow from the water discharge pipe 5 toward the water supply pipe 2 direction. I am letting you.

With this configuration, water can be normally discharged from the water outlet 6 when the main valve 4 is opened, and when the main valve 4 is closed, the check valve 9 is used to direct the water to the outlet 6 direction. Since the circulation of the water is blocked, the water discharge from the water discharge port 6 can be stopped.

In order to discharge the water in the water supply device B for the purpose of preventing freezing or the like, when the water stop valve 1a is closed and the water drain valve 3 is opened, the water drain valve 3 and the main valve 4 are connected. The water in the water supply pipe 2 between is discharged from the drain valve 3 to the outside through the drain pipe 3a,
At the same time, since the check valve 9 is opened, the atmosphere is introduced into the water discharge pipe 5, and the water in the water discharge pipe 5 is discharged into the second branch portion 8.
-> Bypass pipe 10-> Check valve 9-> Bypass pipe 10-> 1st branch part 7-> Water supply pipe 2-> Drain valve 3-> Drain pipe 3a It flows in this order and is discharged outside.

As described above, since water can be completely discharged from the pipe from the water discharge port 6 to the water drain valve 3, it is extremely effective in preventing freezing.

In particular, by bringing the water drain valve 3 as close as possible to the water supply source 1, it becomes possible to discharge water from a wide range of pipes, and the antifreezing effect can be further enhanced.

Even if the water discharge port 6 and the main valve 4 are widely separated (for example, 30 cm or more), if the opening of the drainage pipe 3a is located at a position lower than the water discharge port 6, the water discharge pipe 5 is siphoned. The water inside will be sucked out to the water supply pipe 2 side and will be discharged to the outside without any trouble.

2 and 3 show the check valve 9,
Inside the substantially cylindrical check valve shell 11, a valve seat 12 facing downward is provided.
A vertical flow path 13 is formed, the valve body 15 is vertically slidably fitted in the flow path 13 below the valve seat 12, and the valve seat 15 is closed by sliding the valve body 15 upward. It is configured to open the valve seat 12 by sliding the valve downward, and a plurality of flow grooves 14 are formed on the outer peripheral surface of the valve body that is in sliding contact with the inner wall surface of the flow path 13 and the valve body is formed.
A spherical buoyancy body 16 is disposed below the valve 15 to give buoyancy for urging the valve body 15 upward.

In order to impart buoyancy to the valve body 15, in addition to the spherical buoyancy body 16 described above, the valve body 15 itself may be formed of a material having a smaller specific gravity than water, or a cavity may be formed inside the valve body 15. Can be formed.

With this configuration, the valve body 15 is constantly biased in the valve closing direction, and the valve closing state is deteriorated due to the pressure fluctuation caused by the opening and closing of the main valve 4, or the rising of the valve closing is delayed and the main valve is delayed. It is possible to prevent such a problem that water is leaked from the water outlet 6 after closing the valve 4.

FIG. 3 shows an embodiment in which the present invention is applied to an automatic faucet C of a wash basin, and a hand is provided on the lower surface of the tip of a faucet 18 which is erected obliquely upward on a top plate 17 of the wash basin. The sensor 19 and the water discharge port 6 are opened, and the water discharge port 6 is disposed below the upper plate 17 via the water discharge passage 5 formed in the upper part of the faucet 18 and the water discharge pipe 5 including the relay pipe 21. The hand sensor 19 is connected to the control unit 24 via the electric wiring 23. In addition, 25 is a straightening plate, 26 is a nut for attaching the faucet 18, and 27 and 28 are cap nuts for connecting the relay pipe 21.

The functional portion 22 is interposed between the relay pipe 21 and the water supply pipe 2 connected to the water supply source 1, and is composed of a drain valve casing 29 and a valve casing 30.

Inside the water drain valve casing 29, a partition wall 33 having a water supply passage 31 whose starting end is connected to the water supply source 1 is bent into a substantially U shape, and a water shutoff valve hole 32 is formed in the lowermost portion thereof. The water shutoff valve hole 32 is opened and closed by a water shutoff valve body 35 of a water shutoff valve 34 that is inserted laterally through the wall body of the drain valve casing 29.

Further, a water drainage channel 36 is formed in the lower surface wall of the lowermost portion of the substantially U-shaped water supply channel 31, and the drainage valve body of the water drainage valve 3 is inserted from below. It is open and closed at 37. Reference numeral 38 is a communication hole for connecting another faucet.

With this construction, the water shutoff valve 34 and the water drain valve 3 can be compactly housed in the water drain valve casing 29, and in particular, the water drain valve 3 is located at the bottom of the water supply passage 31. be able to.

The end of the water drain valve casing 29 is connected to the start end of the valve casing 30, and the valve casing 30
In the inside of, the valve flow path 39 is bent into a substantially L shape,
A strainer 41 is arranged at the end of the horizontal portion 40, and the vertical portion
42 is provided with a substantially L-shaped partition wall 45 in which a check valve mounting hole 43 on the lower surface and a main valve hole 44 on the side surface are formed, and a portion where the vertical portion 42 communicates with the drain valve casing 29, It is divided into a part communicating with the faucet 18.

The check valve 9 is provided in the check valve mounting hole 43.
The main valve hole 44 is provided with a diaphragm-type main valve body 47, which is driven by a solenoid 46 connected to the control unit 24, so as to be openable and closable.

With this structure, when the water drain valve 3 is closed and the water shutoff valve 34 is opened, the user can put a hand on the faucet.
When it is pushed out below 18, the hand sensor 19 detects this and outputs a valve opening signal to the solenoid 46 via the control unit 24, and the main valve body 47 opens due to the operation of the solenoid 46 and the diaphragm. When water is discharged from the water discharge port 6 and the hand sensor 19 no longer senses a hand or the like, a valve closing signal is output from the control unit 24 and the water discharge can be stopped.

When draining water to prevent freezing or the like, first, the water stop valve 34 is closed, and then the water drain valve 3 is opened, so that the check valve 9 is opened. Regardless of the open / closed state of the valve 4, the water from the water discharge port 6 to the drain valve 3 is discharged from the drain channel 36 to the outside.

In particular, since the water drain valve 3 is close to the water supply source 1 and the water drain valve 3 and the water drain passage 36 are provided at the bottom of the water drain valve casing 29, water can be drained. The range is widened, and the water in the water drain valve casing 29 and the water from the water shutoff valve 34 to the water outlet 6 are completely discharged even if the distance between the water outlet 6 and the main valve 4 is 30 cm or more. Therefore, the antifreezing effect can be enhanced.

Further, since the check valve 9 is opened / closed at the time of draining water regardless of the opened / closed state of the main valve 4, it is not necessary to open the main valve 4 at the time of draining work, and these troubles are not required. Can be omitted.

[0030]

According to the present invention, the upstream side and the downstream side of the main valve interposed between the water supply source and the water outlet are prevented from flowing in the middle of the water flow toward the water outlet and the water flows toward the water source. By connecting with a bypass passage provided with a check valve for circulating water, it is possible to discharge the water between the drain valve and the spout regardless of the opened / closed state of the main valve when the drain valve is opened. .

By providing the water drain valve near the water supply source, the water drainage range is widened, and the water drainage effect (freezing prevention effect, etc.) can be improved.

Inside the check valve, a vertical water passage having a downward facing valve seat is formed, and a valve body having a plurality of flow grooves formed on the outer peripheral surface of the water passage below the valve seat is vertically moved. It is configured to be slidably fitted so that the valve seat is closed by sliding the valve body upward, and the valve seat is opened by sliding the valve body downward, and the valve body is mounted on the valve body. By applying buoyancy to urge the valve in the direction, the structure is simplified without the need to guide the valve, and the buoyancy always urges the valve in the valve closing direction. The valve closed state can be maintained irrespective of the fluctuation of the water pressure due to, and water leakage from the spout after the main valve is closed can be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the configuration of a water supply device with a water draining mechanism according to the present invention.

FIG. 2 is a vertical cross-sectional explanatory view of a check valve.

3 is a cross-sectional view taken along line I-I in FIG.

FIG. 4 is an explanatory cross-sectional view of a faucet of a washbasin to which the water supply device with a water draining mechanism of the present invention is applied.

FIG. 5 is an explanatory view of a conventional drainage structure.

[Explanation of symbols]

 1 Water supply source 2 Water supply pipe 3 Drain valve 4 Main valve 5 Water discharge pipe 6 Water discharge port 9 Check valve 10 Bypass pipe 12 Valve seat 13 Flow path 14 Flow groove 15 Valve body

Claims (4)

[Claims] 1. A drain valve (3) is connected to a water supply source (1) for supplying water and / or hot water, and a main valve (4) is connected to the water drain valve (3) via a water supply pipe (2). And the water outlet (6) to the main valve (4) via the water discharge pipe (5), and the above water supply pipe (2) and water discharge pipe (5).
Is connected by a bypass pipe (10) with a check valve (9) that prevents water flow toward the outlet (6) in the middle but allows water to flow toward the water supply source (1). A water supply device with a water draining mechanism. 2. The water supply device with a water drainage mechanism according to claim 1, wherein the water drainage valve (3) is provided in the vicinity of the water supply source (1). 3. The water supply device with a water drainage mechanism according to claim 1, wherein the water drainage valve (3) is provided at the lowest part of the water supply pipe (2) and the water discharge pipe (5). 4. The check valve (9) is internally provided with a vertical flow passage (13) having a downwardly facing valve seat (12) formed therein.
2) The valve body (15) is vertically slidably fitted in the lower flow passage (13), and a plurality of flow grooves (14) are formed on the inner peripheral surface of the flow passage (13) below the valve seat (12). And the valve seat (12) is closed by sliding the valve body (15) upward, and the valve seat (12) is opened by sliding the valve body (15) downward. At the same time, the valve body (15) is provided with a buoyancy force for urging the valve body (15) in an upward direction.