JP2565465Y2 - Water tank water supply device - Google Patents

Description

[Detailed description of the invention]

[0001]

In this invention, a water supply pipe which rises through a bottom wall in a water storage tank is erected, and a liquid level in the tank is detected at an upper end of the water supply pipe to stop and supply water. The present invention relates to a water supply device for a water storage tank provided with a liquid level control device for controlling the water level.

[0002]

2. Description of the Related Art A water storage tank stores tap water and pumps the water in the tank into an elevated water tank or the like using a submersible pump installed in the tank water or a land pump installed outside the tank. When the water level falls below a predetermined level, a float such as a ball tap detects the drop, and the valve is opened to supply tap water into the tank.
Most of the water supply pipes are piped into the tank so as to penetrate from the side through the upper part of the side wall, or to penetrate from the top through the ceiling wall.

[0003]

Conventionally, as described above, since the piping is provided from the side wall or the ceiling wall, in the city, the necessity of the piping from the bottom wall has been demanded from the viewpoint of saving installation space. Since the water supply pipe rises into the tank from the bottom wall by itself, if there is a crack in the water supply pipe, if water is not supplied to the water supply pipe from the water supply main line to which the water supply pipe is connected, When the water is cut off, the water in the water storage tank enters the water supply pipe through the crack, flows backward through the water supply pipe, flows into the water main, and causes sanitary problems such as contamination of the tap water.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a water supply pipe which, when a crack is formed in a rising portion inside a water storage tank, allows the occurrence of the crack to be detected at an early stage due to water leakage. In order to prevent the water in the tank from flowing backward, a water supply pipe that rises through the bottom wall in the water storage tank is erected, and the liquid in the tank is provided at the upper end of the water supply pipe. In the water supply device of a water storage tank provided with a liquid level control device that detects a surface and controls water supply and stop, an opening larger than the diameter of the water supply pipe is opened in the bottom wall, concentric with the water supply pipe penetration position. , A small-diameter tubular part holding the water supply pipe at the lower end,
At the upper end, a large-diameter tube portion that holds a tube having a diameter larger than the water supply pipe is provided. It is fixed to the opening, and the water supply pipe is held by the small-diameter tube part of the connecting cylinder, and the large-diameter cylinder part surrounds the water supply pipe, and the upper end of the outer cylinder reaches above the full liquid level in the tank. It is characterized in that the lower end is attached and erected.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, reference numeral 10 denotes a bottom wall of a water storage tank, 11 denotes a tap water supply pipe which rises through the bottom wall and rises inside the storage tank, and an upper end of the water supply pipe has a liquid level via an elbow. A ball tap 12 is attached as a control device. As is well known, the ball tap 12 has a water outlet 13 with a valve, and when the water level in the tank is at the full liquid level WL and the float 12 ′ is in the solid line state shown in the drawing, water is supplied from the water outlet 13. Stops and the water level drops due to the replenishment of water outside the tank,
The water outlet 13 supplies tap water into the tank when the float is in the state shown by the broken line in the drawing, and the water supply stops when the water level in the tank returns to the full liquid level again. Reference numeral 14 denotes an outer cylinder surrounding the water supply pipe 11, and reference numeral 20 denotes a connecting cylinder.

The connecting tube 20 in the embodiment shown in FIGS.
The small-diameter cylindrical portion 21 holding the water supply pipe 1
At the upper end, a large-diameter cylindrical portion 22 for holding the outer cylinder 14 having a larger diameter than the large-diameter cylindrical portion 23 is provided between the small-diameter cylindrical portion 21 and the large-diameter cylindrical portion 22. It has become
On the lower surface 24 of the intermediate cylindrical portion 23 formed by the difference in diameter between the intermediate cylindrical portion 23 and the small-diameter cylindrical portion 21, a plurality of drain ports 25 are provided at equal intervals in the circumferential direction. This connecting tube is made of plastic or metal.

An opening 15 having a diameter through which the large-diameter cylindrical portion 22 of the connecting cylinder passes is provided at a position where the water supply pipe 11 penetrates the bottom wall 10 of the water storage tank.
Is established concentrically. Then, the connecting cylinder 20 is connected to the small-diameter cylindrical section 2.
1 fits into the lower end of the water supply pipe 11, moves the connecting cylinder upward along the water supply pipe, and inserts the large-diameter cylindrical part 22 into the opening 15 from below to make the upper surface of the intermediate cylindrical part 23 the lower surface of the bottom wall. , And a nut 16 is screwed from above onto an external thread on the outer periphery of the large-diameter cylindrical portion and tightened on the bottom wall to fix the connecting cylinder 20 to the bottom wall. Then, the O-ring 17 and the cap nut 18 are fitted into the water supply pipe 11 from the lower end, and the cap nut 18 is screwed into the external thread on the outer periphery of the small-diameter cylindrical portion 21 from below to tighten the O-ring 17 to the lower end of the small-diameter cylindrical portion. The water supply pipe 11 is held between the tapered surface provided on the inner circumference and the outer circumference of the water supply pipe by the connecting cylinder 20.
Then, the outer cylinder 14 is lowered into the tank from a manhole or the like on the ceiling wall of the water storage tank, and the lower end thereof is screwed into the female screw on the inner periphery of the large-diameter cylindrical portion 22 to erect the outer cylinder 14 on the connecting cylinder 20. The upper end of the outer cylinder 14 thus set is located slightly above the liquid level WL in the tank. Finally, an elbow provided with a ball tap 12 is connected to the upper end of the water supply pipe 11, and the state shown in FIG. 1 is obtained. The above-described assembling sequence is one example, and the same assembling can be performed in another order.

In this assembled state, the outer cylinder 14 that stands from the connecting cylinder 20 fixed to the bottom wall rises above the water-filled liquid level WL.
Surround 1 around. Therefore, even if a crack occurs in the water supply pipe 11, the water in the tank is prevented from entering the water supply pipe through the crack and flowing backward when the water is cut off by the outer cylinder 14. Also, except when the water supply is cut off, the tap water is pressurized and reaches the valve of the ball tap through the water supply pipe 11. If there is a crack in the water supply pipe 11, the tap water oozes out of the crack and flows through the outer cylinder 14. It flows down and drops on the floor from the drain port 25 on the lower surface of the intermediate cylindrical portion 23. Therefore, it can be known that the water pipe has been cracked by the water dropped on the floor.

The difference between the connecting cylinder 20 of the embodiment shown in FIG. 3 and that of the connecting cylinder 20 shown in FIGS.
2 and larger than the small-diameter cylindrical portion 21, whereby the connecting cylinder is constituted by three stepped cylinders.
Reference numeral 2 has a flange 26 on the outer periphery of the lower end, and the drain port 25 is provided on the peripheral wall of the intermediate cylindrical portion. This connecting tube is also Tsuba 2
The large-diameter cylindrical portion 22 is inserted from below into the opening 15 of the bottom wall until the bottom surface 6 contacts the lower surface of the bottom wall 10, and the nut 16 screwed around the outer periphery of the large-diameter cylindrical portion is tightened to the bottom wall from above. Can be fixed to the wall. Further, the O-ring 17 and the cap nut 18 are fitted into the small-diameter cylindrical portion 21 from below, and the cap nut 18 is tightened to hold the water supply pipe 11 with the O-ring. Then, the outer cylinder 14 is provided on the inner periphery of the large-diameter cylinder 22, and the step surface 22 between the large-diameter cylinder and the intermediate cylinder is formed.
The outer cylinder can be erected on the connecting cylinder by screwing until the lower end abuts on '. Therefore, even when the connecting tube 20 is used, it is possible to prevent water in the tank from flowing through the crack formed in the water supply pipe and flowing backward when water is cut off, and also to find out that the water supply pipe has been cracked. .

In any of the embodiments, a fine net 27 is provided at the drain port 25 of the intermediate cylindrical portion 23 to prevent insects and the like from entering the inside. Further, since a liquid level control device such as a ball tap is a heavy object, when the water supply pipe is made of a hard PVC pipe, it is preferable to support the liquid level control device on a ceiling wall or a side wall to reduce the burden on the water supply pipe.

[0011]

[Effects of the Invention] As is clear from the above, according to the present invention, when the water supply is cut off, the water inside the tank enters through the crack generated in the water supply pipe and flows backward in the pipe to contaminate the water main pipe by the outer cylinder. Definitely hinder. Also, if a crack occurs in the water supply pipe, it flows down through the outer cylinder that has oozed out of the crack and drops onto the floor from the drain port of the intermediate cylinder part of the connecting cylinder. You can also know quickly.

[Brief description of the drawings]

FIG. 1 is a side view of a part of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged sectional view of a main part of another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 bottom wall of water storage tank 11 water supply pipe 12 ball tap 14 outer cylinder 15 opening of bottom wall 20 connecting cylinder 21 small-diameter cylindrical part 22 large-diameter cylindrical part 23 intermediate cylindrical part 25 drain port WL full liquid level

Claims (1)

(57) [Scope of request for utility model registration] 1. A water level control system for installing a tap water supply pipe rising up through a bottom wall in a water storage tank, detecting a liquid level in the tank at an upper end of the water supply pipe, and controlling water supply and stop. In the water supply device of the water tank provided with the device, in the bottom wall, an opening larger than the diameter of the water supply pipe and concentric with the water supply pipe penetration position is opened, and a small-diameter cylindrical portion holding the water supply pipe is provided at the lower end, At the upper end, a large-diameter tube portion that holds a tube having a diameter larger than the water supply pipe is provided.
At the middle, a connecting cylinder having at least a diameter larger than the small-diameter cylindrical portion and having an intermediate cylindrical portion having a drain port is fixed to the opening, and the small-diameter cylindrical portion of the connecting cylinder holds a water supply pipe and has a large size. A small-diameter water supply pipe and a large-diameter outer cylinder that surround the periphery of the water supply pipe and attach the lower end of the outer cylinder whose upper end rises above the liquid level in the tank. A water supply device for a water tank characterized by having a double structure.