Liquid material discharge device comprising booster circuit

Patent metadata

Field	Value
Publication number	US-11344903-B2
Application number	US-201716078154-A
Country	US
Kind code	B2
Filing date	Feb 20, 2017
Priority date	Feb 22, 2016
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A liquid material discharge device includes: a plunger including a piston formed at a rear end a piston chamber in which the piston is disposed and to which pressurized gas is supplied; a pressure supply device that supplies, to the piston chamber, air pressurized in excess of the urging force of the elastic body, or that purges pressurized air out of the piston chamber, the liquid material discharge device discharging the liquid material from the discharge port by causing the plunger to move forward and applying an inertial force to the liquid material; a booster circuit that communicates the pressure supply device and an air source with each other, and the booster circuit includes a first and a second booster system including a booster valve and a pressure reducing valve, and a merging section in which the first booster system and the second booster system merge together.

First claim

The invention claimed is:

1. A liquid material discharge device comprising:
a liquid chamber that is communicated with a discharge port and is supplied with a liquid material;
a plunger including a piston formed as part thereof and having a tip portion that is moved back and forth in the liquid chamber;
an elastic member that applies an urging force to the plunger;
a piston chamber in which the piston is disposed and to which pressurized gas is supplied; and
a pressure supply device that supplies, to the piston chamber, air pressurized in excess of the urging force of the elastic member, or that purges pressurized air out of the piston chamber,
the liquid material discharge device discharging the liquid material from the discharge port by causing the plunger to move forward and applying an inertial force to the liquid material,
wherein the liquid material discharge device further comprises a booster circuit that communicates the pressure supply device and an air source with each other,
the booster circuit includes a first booster system including a booster valve and a pressure reducing valve positioned downstream of the booster valve, a second booster system including a booster valve and a pressure reducing valve positioned downstream of the booster valve, and a merging section in which the first booster system and the second booster system merge together, and
a pressure adjustment valve is disposed between the merging section and the pressure supply device.

2. The liquid material discharge device according to claim 1 ,
wherein the first booster system includes a first check valve in a flow path connected to the merging section, and
the second booster system includes a second check valve in a flow path connected to the merging section.

3. The liquid material discharge device according to claim 2 ,
wherein the first booster system includes a storage tank disposed downstream of the booster valve, and
the second booster system includes a storage tank disposed downstream of the booster valve.

4. The liquid material discharge device according to claim 3 ,
wherein the storage tank in the first booster system is constituted by an upstream-side storage tank and a downstream-side storage tank, and
the storage tank in the second booster system is constituted by an upstream-side storage tank and a downstream-side storage tank.

5. The liquid material discharge device according to claim 1 ,
wherein the booster circuit includes a branch portion at which the pressurized air supplied from the air source is branched to the first booster system and the second booster system.

6. The liquid material discharge device according to claim 1 ,
wherein the first booster system is connected to a first air source, and
the second booster system is connected to a second air source.

7. The liquid material discharge device according to claim 1 , wherein the pressure adjustment valve supplies, to the pressure supply device, the pressurized air under higher pressure than supply pressure of the air source.

8. The liquid material discharge device according to claim 1 , wherein the elastic member urges the piston upward, and the pressure supply device supplies the pressurized air acting to move the piston downward, or
wherein the elastic member urges the piston downward, and the pressure supply device supplies the pressurized air acting to move the piston upward.

9. The liquid material discharge device according to claim 1 , wherein the pressure supply device is constituted by a solenoid valve.

10. The liquid material discharge device according to claim 1 , further comprising a reservoir in communication with the liquid chamber;
a pressure reducing valve for the reservoir through which the pressurized air is supplied under desired pressure to the reservoir; and
an opening/closing valve that establishes or cuts off communication between the reservoir and the pressure reducing valve for the reservoir.

11. The liquid material discharge device according to claim 1 , further comprising a reservoir in communication with the liquid chamber;
a pressure reducing valve for the reservoir through which the pressurized air is supplied under desired pressure to the reservoir; and
a switching valve having a first position at which the reservoir and the pressure reducing valve for the reservoir are communicated with each other, and a second position at which the reservoir and the outside are communicated with each other.

12. The liquid material discharge device according to claim 10 , further comprising a branch portion that communicates the pressure reducing valve for the reservoir and the air source with each other.

13. The liquid material discharge device according to claim 10 , wherein the pressure reducing valve for the reservoir is connected to an air source different from the booster circuit.

14. An application apparatus comprising the liquid material discharge device according to claim 1 , a worktable on which an application target object is placed, and a relatively moving device that moves the liquid material discharge device and the application target object relative to each other.

Assignees

• Musashi Eng Inc

Inventors

• Ikushima Kazumasa

Classifications

• B05B9/0413 Primary

  with reciprocating pumps, e.g. membrane pump, piston pump, bellow pump (B05B9/0409 takes precedence) · CPC title

• B05C11/1047

  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 title

• B05C5/0225 Primary

  characterised by flow controlling means, e.g. valves, located proximate the outlet (B05C5/0258, B05C5/0275 take precedence; supply valves upstream the coating head B05C11/1036) · CPC title

• B05C11/1034

  specially designed for conducting intermittent application of small quantities, e.g. drops, of coating material (B05C5/0225, B05C11/1026 take precedence) · CPC title

• F15B11/028

  for controlling the actuating force (F15B11/024 takes precedence) · CPC title