JP3037841B2 - Temporary water supply structure of water supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary water supply structure of a water supply device used to secure water supply to each house when an elevated water tank cannot be used.

[0002]

2. Description of the Related Art As a conventional example of this kind of temporary water supply structure, there is known a structure in which a temporary tank is mounted in a water storage tank such as an elevated water tank as described in Japanese Patent Application Laid-Open No. 1-151626. I have. That is, in this conventional example,
When the water tank cannot be used due to cleaning or the like, water is sent to a temporary tank attached to the water tank, and the water in the temporary tank is sent out to an existing pipe via a pipe.

[0003]

However, the above-mentioned conventional temporary water supply structure has to be installed in an elevated water tank (water storage tank), so that it is applied when the elevated water tank is not removed as in cleaning. Even if it could be done, there was a problem that it could not be applied when replacing or repairing the elevated water tank. In addition, such a conventional structure requires the use of a temporary tank having a considerably smaller capacity than the elevated water tank,
The amount of water supply was greatly restricted, and it was extremely difficult to maintain the normal water supply state.

Accordingly, an object of the present invention is to solve such a problem of the prior art, to maintain the same water supply state as usual at the time of replacement or repair of an elevated water tank, and to have a relatively simple structure. Another object of the present invention is to provide a temporary water supply structure for a water supply device.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a pump for pumping water in a water receiving tank into an elevated water tank via a water supply pipe, and to send water in the elevated water tank to each door via a water supply pipe. In the water supply device configured to supply, when the elevated water tank is unusable, a discharge pipe extending from a discharge side of the pump to the water receiving tank, a discharge valve disposed in the middle of the discharge pipe, and the water supply pipe The present invention is also achieved by providing a bypass pipe for connecting the water supply pipe at a height close to the elevated water tank, and a pressure reducing valve disposed in the middle of the bypass pipe.

[0006]

According to the temporary water supply structure of the present invention having the above-mentioned components, when the pump is continuously operated while the supply of water to the elevated water tank is shut off, the water in the water receiving tank is pumped, and the water supply pipe and After passing through a bypass pipe, the pressure is reduced to a predetermined pressure by a pressure reducing valve, and then sent to each house via a water supply pipe. In addition, when the amount of water in each house is small and the pressure in the water supply pipe rises to some extent, the pressure reducing valve closes, so the pressure on the discharge side of the pump increases gradually,
When the pressure exceeds the set pressure of the discharge valve, the discharge valve is opened, and the pumped water returns to the water receiving tank through the discharge pipe.

[0007]

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a system diagram of a water supply apparatus according to the present embodiment in which temporary water supply can be performed prior to replacement of an elevated water tank.

In FIG. 1, an elevated water tank 12, which is to be replaced with a new one, is installed on the roof of a building 1. Normally, water in a water receiving tank 2 installed under the building 1, etc., is installed. The pump 3 sends the water to the elevated water tank 12 via the water supply pipe 4 and the water supply valve 5, and supplies the water in the elevated water tank 12 to the faucet 7 of each house via the water supply pipe 6. In the present embodiment, a discharge pipe 8 extending from the discharge side of the pump 3 to the water receiving tank 2 and a discharge pipe 8 serving as a temporary water supply structure for ensuring the supply of water to each house when the elevated water tank 12 is unavailable. A discharge valve 9 disposed in the middle of the pipe 8, a bypass pipe 10 for connecting the water supply pipe 4 and the water supply pipe 6 at a height close to an elevated water tank 12, and a bypass pipe 1;
And a pressure reducing valve 11 arranged in the middle of 0. Here, the discharge valve 9 is a valve that is set to open when the pressure on the discharge side of the pump 3 exceeds a predetermined value, and the pressure reducing valve 11 adjusts the pressure in the water supply pipe 4 to supply water. This is a valve for reducing the pressure to a certain level.

Reference numeral 13 in the figure denotes a gate valve provided on the suction side of the pump 5, and reference numerals 14 and 15 denote a check valve and a gate valve provided on the discharge side of the pump 5.

Next, the operation of the temporary water supply structure of this embodiment will be described.

Prior to the replacement of the elevated water tank 12, if the installation of the discharge pipe 8, the discharge valve 9, the bypass pipe 10, the pressure reducing valve 11, etc. is completed, the water supply valve 5 is closed to shut off the supply of water to the elevated water tank 12. In this state, the pump 5 is operated continuously. Thereby, the water in the water receiving tank 2 is pumped up and sent from the water supply pipe 4 to the bypass pipe 10, and after passing through the bypass pipe 10, the pressure is reduced to a predetermined pressure by the pressure reducing valve 11. And sent to the faucet 7 of each house. When the amount of water used in each house is small and the pressure in the water supply pipe 6 increases to some extent, the pressure reducing valve 11 closes, so that the pressure in the water supply pipe 4 into which water is pumped from the water pump 5 gradually increases. When the pressure becomes higher than the set pressure of the discharge valve 9, the discharge valve 9 opens, and the pumped water returns to the water receiving tank 2 through the discharge pipe 8. In other words, only the water is circulated by the water pump 5. In this state, when the amount of water used in each house increases again, the pressure in the water supply pipe 6 decreases, the pressure reducing valve 11 opens, and the water supply pipe 4 When the internal pressure becomes lower than the set pressure of the discharge valve 9, the discharge valve 9 closes, so that the pumped water does not return to the water receiving tank 2 and is sent to the water supply pipe 6 through the bypass pipe 10. It is.

As described above, according to the present embodiment, when the elevated water tank 12 is unusable, temporary water supply can be performed while the existing pump 5 is continuously operated, so that the amount of water supplied to each house is reduced. There is almost no restriction, and since the pressure reducing valve 11 is installed at a height close to the elevated water tank 12, the water pressure in the water supply pipe 6, which is the secondary-side pressure, is different from that during normal water supply using the elevated water tank 12. It can be set to the same degree, and therefore, there is an advantage that a water supply state equivalent to a normal state can be maintained. In addition, there is no need to mount the temporary tank at a high place as in the past, and it is only necessary to attach pipes and valves.
There is an advantage that temporary water supply can be easily performed not only at the time of cleaning the elevated water tank 12 but also at the time of replacement or repair.

[0013]

As described above, water is supplied to the water supply pipe through the bypass pipe while the existing pump is continuously operated, and when the water usage of each house is small, the water is circulated through the discharge pipe. According to the present invention as described above, not only when cleaning the elevated water tank but also when replacing or repairing it, a water supply state equivalent to the normal state can be maintained, and a temporary water tank is unnecessary and the water supply device is relatively simple in configuration. Temporary water supply structure can be provided.

[Brief description of the drawings]

FIG. 1 is a system diagram of a water supply apparatus according to the present embodiment in which temporary water supply can be performed prior to replacement of an elevated water tank.

[Explanation of symbols]

 Reference Signs List 2 water receiving tank 3 pumping pump 4 water supply pipe 6 water supply pipe 7 faucet 8 discharge pipe 9 discharge valve 10 bypass pipe 11 pressure reducing valve 12 elevated water tank

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshimatsu Noguchi 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Within Hitachi Building System Service Co., Ltd. (56) References JP-A-1-151626 (JP, A) 1-163327 (JP, U) Actually open 63-269,000 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E03B 11/12

Claims (1)

(57) [Claims] 1. A water supply device in which a water pump in a water receiving tank feeds water in an elevated water tank via a water supply pipe to an elevated water tank and supplies the water in the elevated water tank to each door through a water supply pipe. When the pump is not usable, a discharge pipe from the discharge side of the pump to the water receiving tank, a discharge valve disposed in the middle of the discharge pipe, and a water pipe and the water supply pipe having a height close to the elevated water tank. A temporary water supply structure of a water supply device, characterized by further comprising a bypass pipe communicated with the water pipe and a pressure reducing valve disposed in the middle of the bypass pipe.