Automatic drain

Patent metadata

Field	Value
Publication number	US-9970594-B2
Application number	US-201415301077-A
Country	US
Kind code	B2
Filing date	Nov 14, 2014
Priority date	Apr 15, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A drain hole for connecting a discharge hole and the inside of a collection container to each other is formed in a valve seat member. A float support is provided with a cylinder portion in which a piston is incorporated in a slidable manner. An vent valve for opening and closing a vent hole by means of a float is provided to the float support. A drain valve which operates between a closing position at which the drain valve closes the drain hole and an open position at which the drain valve opens the drain hole is provided to the piston. A bleed channel for connecting a piston chamber and the discharge hole to each other is formed by an orifice pin mounted in a bleed hole provided to the drain valve.

First claim

What is claimed is:

1. An automatic drain comprising: a port block, an inflow port and an outflow port being provided to an upper part of the port block; and a collection container, a discharge hole being provided to a bottom part of the collection container, liquid separated from compressed air flowing from the inflow port to the outflow port is automatically discharged to outside, the automatic drain further comprising:
a valve seat having a drain hole through which an inside of the collection container communicates with the discharge hole, the valve seat being attached to the bottom part of the collection container;
a float support disposed on top of the valve seat, the float support having: a cylindrical portion provided with a lower end which abuts on the valve seat; and a top wall portion provided to an upper end of the cylindrical portion;
a piston slidably incorporated in the cylindrical portion, a piston chamber being formed between the piston and the top wall portion of the float support;
a float disposed on the outside of the float support, the float being moved up and down by liquid accumulated in the collection container;
a vent valve in which, when the float moves up, the vent valve opens a vent hole provided to the top wall portion to supply air in the collection container to the piston chamber and that when the float moves down, closes the vent hole;
a drain valve provided to the piston, the drain valve being shifted to a closed position at which the drain valve closes the drain hole and to an open position at which the drain valve opens the drain hole, the drain valve being provided with a bleed hole, the piston chamber communicating with the discharge hole via the bleed hole;
an opening spring attached to the piston chamber, the opening spring applying an opening spring force to the drain valve in a direction causing the drain valve to move to the open position; and
an orifice pin placed in the bleed hole, the orifice pin forming a bleed channel between the orifice pin and an inner surface of the bleed hole,
wherein the orifice pin has a bent upper portion forming an engagement portion which is engaged with the piston.

2. The automatic drain according to claim 1 , further comprising a closing spring which applies a closing spring force to the drain valve in a direction opposite to the opening spring force and moves the drain valve to the closed position from the open position, the drain valve taking the closed position when compressed air is not being supplied into the collection container,
wherein the closing spring force is greater than the opening spring force.

3. The automatic drain according to claim 1 , wherein the piston is provided with a filter element which is made of porous material and which filters out foreign matters from air flowing from the piston chamber into the bleed channel.

4. The automatic drain according to claim 3 , wherein the filter element abuts on the engagement portion engaged with the piston, the engagement portion being held between the filter element and the piston so that the orifice pin is fixed to the piston.

5. The automatic drain according to claim 3 , wherein the filter element has a bottom portion that abuts on the engagement portion engaged with the piston so that the orifice pin is fixed to the piston.

6. The automatic drain according to claim 3 , wherein
the piston includes: a large-diameter cylindrical portion, a piston packing being attached to the outside of the large-diameter cylindrical portion; and a small-diameter cylindrical portion that is hollow and extends in an axial direction of the piston on the inside of the large-diameter cylindrical portion,
wherein the filter element is attached to provided inside the small-diameter cylindrical portion, and
wherein the piston chamber and the bleed channel communicate with each other via the filter element.

7. The automatic drain according to claim 6 , wherein the filter element abuts on the engagement portion engaged with the piston so that the orifice pin is fixed to the piston.

Assignees

• Koganei Ltd

Inventors

• Doki Makoto

Classifications

• F16T1/20 Primary

  with valves controlled by floats · CPC title

• F16T1/22

  of closed-hollow-body type · CPC title