Title:
WATER SUPPLY DIRECT-CONNECTION WATER SERVICE SYSTEM
Document Type and Number:
Japanese Patent JP3287528
Kind Code:
B2
Abstract:
PURPOSE: To realize stabel supply by decreasing the start frequency of a pump in a water line direct connection water service system.
CONSTITUTION: A second pressure sensor 7 provided at a suction pipe 2 connected to a water main 1 and a first pressure sensor 18 provided at a water feed pipe 20 are compared with each other, and by means of a controller 21, a pump is stopped in a case in which the origin pressure of the water main 1 has become, at discharge side required pressure, for more than a fixed time higher than a value that considers resistance between both pressure sensors 7, 18, and the pump is started again in a case in which the pressure of the water main 1 has become lower than a target pressure. After this condition has been realized, whether or not a small water amount use state exists is decided, and the pump is stooped in the case of a small water amount state.
Inventors:
Koichi Sato
Hiroshi Kunii
Hiroshi Kunii
Application Number:
JP13651895A
Publication Date:
June 04, 2002
Filing Date:
June 02, 1995
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
E03B1/00; E03B5/00; E03B11/16; F04B49/00; (IPC1-7): E03B5/00; F04B49/00
Domestic Patent References:
| JP5240186A | ||||
| JP5263444A |
Attorney, Agent or Firm:
Masami Akimoto