Title:
WATER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JP2022170311
Kind Code:
A
Abstract:
To provide a water supply device capable of improving resolution and response properties in an area requiring pressure control.SOLUTION: A water supply device 1 includes: a motor 31; a variable speed drive part 57 for controlling the motor 31; a pressure detector 21 that is provided in a secondary side of a pump 32, detects pressure within a range of a predetermined lower-limit pressure and a predetermined upper-limit pressure, and outputs voltage corresponding to the detected pressure within a range of a lower-limit voltage and an upper-limit voltage corresponding to a range of a lower-limit pressure and the upper-limit pressure; a differential amplification circuit part 61 connected to the pressure detector 21; and an operation part 58 for computing an offset voltage from a rated pressure P1. In the differential amplification circuit part 61, an output voltage of the pressure detector 21 is inputted to one of pieces of differential input of the differential amplification circuit part 61, and an offset voltage computed by the operation part 58 is inputted to the other of the pieces of differential input.SELECTED DRAWING: Figure 5
Inventors:
SAKATANI TETSUNORI
WATANABE SHOTA
SAKANO SEIJI
WATANABE SHOTA
SAKANO SEIJI
Application Number:
JP2021076365A
Publication Date:
November 10, 2022
Filing Date:
April 28, 2021
Export Citation:
Assignee:
KAWAMOTO PUMP MFG
International Classes:
F04B49/06; F04B49/10
Attorney, Agent or Firm:
Masatoshi Kurata
Nobuhisa Nogawa
Tadashi Inoue
Naoki Kono
Shigeru Iino
Sanae Kaneko
Nobuhisa Nogawa
Tadashi Inoue
Naoki Kono
Shigeru Iino
Sanae Kaneko