Constant feed water device

• US 5,124,934 A
• Filed: 02/27/1990
• Issued: 06/23/1992
• Est. Priority Date: 03/03/1989
• Status: Expired due to Fees

• Current Assignee: INAX Corporation (LIXIL Group Corp.)
• Original Assignee: INAX Corporation (LIXIL Group Corp.)
• Inventors: Kawamoto, Ryuichi, Hirade, Keisuke
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Ramirez, Ellis B.
• Application Number:
  US07/485,533
• Time in Patent Office: 847 Days
• Field of Search: 364/509, 364/510, 364/479, 364/167.1, 239/68, 137/624.11, 222/14, 222/15, 222/20, 222/52
• US Class Current: 700/282
• CPC Class Codes: G01F 15/003 using electromagnetic, electric or electronic means G01F15/002, G01F15/02 take precedence
• CPC Class Codes: G05D 7/0635 by action on throttling means G05D7/0688, G05D7/0694 take precedence

Abstract

A constant liquid feeding device of the invention comprises a flow meter for measuring quantity of liquid flowing through a pipe, a valve attached to the pipe, a valve control device attached to the valve for opening and closing the pipe, an operating device having a feeding switch and a learning switch, and a control unit electrically connected to the operating device and the valve control device. The control unit is provided with a first memory, a second memory and a comparing device for comparing data stored in the first and second memories. When the learning switch is actuated, the control unit operates to memorize an amount of liquid flowing through the flow meter in the first memory, wherein the amount of liquid is manually controlled by the valve control device. When the learning switch is not actuated, the control unit checks if the feeding switch is turned on. Only when the feeding switch is turned on, the control unit operates the valve control device to open the valve and to leave the valve open to supply the same amount of liquid memorized in the first memory so that the present amount of liquid can be always supplied.

Claims

1. A constant liquid feeding device for supplying a predetermined amount of liquid through a pipe, comprising;

a flow meter for measuring quantity of liquid flowing through the pipe,

a valve attached to the pipe for opening and closing the pipe,

valve control means connected to the valve for opening and closing the pipe,

operating means having a feeding switch and a learning switch, and

a control unit electrically connected to the operating means and the valve control means, said control unit having a first memory, a second memory and comparing means for comparing data stored in the first and second memories, said control unit, (1) when the learning switch is actuated, operating to memorize an amount of liquid flowing through the flow meter in the first memory, said amount of liquid being manually controlled by the valve control means by actuating the feeding switch, and (2) when the learning switch is not actuated, checking if the feeding switch is turned on, and operating the valve control means to open the valve only when the feeding switch is turned on and to leave the valve open to supply same amount of liquid memorized in the first memory so that preset amount of liquid can be always supplied.

2. A constant liquid feeding device according to claim 1, wherein said control unit, when the learning switch is not actuated, has a function such that an amount of liquid passing through the pipe is measured by the flow meter and is memorized in the second memory, said comparing means comparing the data in the first and second memories and when the data in the second memory is equivalent to the data in the first memory, the valve control means being closed so that preset amount memorized in the first memory is always supplied.

3. A constant liquid feeding device according to claim 2, wherein data in the first memory is eliminated whenever the learning switch is actuated, and new data measured by the flow meter is memorized in the first memory.