Liquid material supply system

• US 6,799,698 B2
• Filed: 10/27/2003
• Issued: 10/05/2004
• Est. Priority Date: 02/21/2003
• Status: Expired due to Fees

• Current Assignee: Heishin Sobi Kabushiki Kaisha
• Original Assignee: Heishin Sobi Kabushiki Kaisha
• Inventors: Suhara, Nobuhisa, Kurahashi, Satoru, Sugino, Yoshihiro, Izumi, Hisatoshi, Ono, Sumio
• Primary Examiner(s): Bomberg, Kenneth
• Application Number:
  US10/694,608
• Publication Number:
  US 20040164091A1
• Time in Patent Office: 344 Days
• Field of Search: 222/52, 222/55, 222/386
• US Class Current: 222/55
• CPC Class Codes: B05C 11/10 Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material B05C1/0813, B05C5/0225, B05C17/002 and B05C19/06 take precedence
• CPC Class Codes: B05C 11/1047 Apparatus or installations for supplying liquid or other fluent material comprising a buffer container or an accumulator between the supply source and the applicator
• CPC Class Codes: B05C 5/02 the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work

Abstract

A liquid material supply system includes a plunger pump, a flow regulating valve, an air-operated valve, a spring type accumulator and a dispenser. The plunger pump is connected to the flow regulating valve by a primary supply line. The flow regulating valve is connected to the dispenser by a secondary supply line. The on-off valve is connected to the secondary supply line. The accumulator is connected to the secondary supply line between the on-off valve and the dispenser. A pressure sensor detects the pressure substantially at the inlet port of the dispenser. This pressure is the basis for controlling the operation of the air-operated valve through an electromagnetic valve. The second chamber of the accumulator can store part of the liquid material supplied through the secondary supply line. The second chamber varies in volume with the balance between the force of the accumulator spring and the pressure in the secondary supply line so as to relax the pressure fluctuation in this line.

Claims

1. A liquid material supply system comprising:

a supply device for sucking liquid material from a storage tank or another reservoir and supplying the sucked material under high pressure;

a pressure reducing valve having a pressure reduction ratio that can be set;

a primary supply line connecting the outlet port of the supply device to the pressure reducing valve;

a discharger for discharging a constant amount of liquid material to a work;

a secondary supply line connecting the pressure reducing valve to the inlet port of the discharger;

an on-off valve connected to the secondary supply line;

a controller connected to the on-off valve;

a pressure sensor for detecting the pressure substantially at the inlet port of the discharger and outputting a pressure signal to the controller so that the controller can close and open the on-off valve if the detected pressure exceeds a set upper limit and falls below a set lower limit, respectively; and

an accumulator connected to the secondary supply line between the on-off valve and the inlet port of the discharger so as to prevent the pressure substantially at the inlet port from exceeding the upper limit and falling below the lower limit in a short time with the pressure reduction ratio so set that the pressure is lower than for the full flow through the secondary supply line while the discharger is operating.