Electrically operated gas flow regulating valve

Patent metadata

Field	Value
Publication number	US-11466790-B2
Application number	US-202117360255-A
Country	US
Kind code	B2
Filing date	Jun 28, 2021
Priority date	Aug 6, 2020
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

An electrically operated gas flow regulating valve in which a needle valve body (2) is moved axially through a motion conversion mechanism (4) by the rotation of an electric motor (3). The motion conversion mechanism (4) includes: a guide tube (5) in which is formed axially elongated slits (51) with which cam pins (21) fixed to the needle valve (2) are slidably engaged; and a tubular cam body (6) having a spiral cam part with which the cam pins (21) are engages through elongated slits (51). In an arrangement in which one of the guide tube (5) and the cam body (6), e.g., the guide tube (5), is rotated by the electric motor (3), hysteresis is restrained from occurring.The cam part disposed in the cam body (6) is constituted by a spirally inclined sides (61) with which the cam pins (21) are brought into contact from axial one direction. A spring member (7) is disposed so as to urge the cam pins (21) in the other of the axial directions toward the spirally inclined sides (61).

First claim

The invention claimed is:

1. An electrically operated gas flow regulating valve comprising: a needle valve body moveable axially toward, or away from, a valve seat inside a valve casing; an electric motor; and a motion conversion mechanism for causing the needle valve body to move axially by rotation of the electric motor,
the motion conversion mechanism having: a cam pin fixed to the needle valve body; a guide tube having formed therein an axially elongated slit so as to be slidably engaged with the cam pin; and a tubular cam body having a spiral cam part with which the cam pin engages through the slit so that one of the guide tube and the cam body is rotated by the rotation of the electric motor and that the other thereof is prevented from rotating relative to the valve casing,
provided: that a direction in which, out of axial directions, the needle valve body moves toward the valve seat is defined as a forward direction; that a direction in which the needle valve body moves away from the valve seat is defined as a backward direction; that a direction of rotation of the electric motor to move the needle valve body in the forward direction is defined as a normal rotating direction; and that the direction of rotation of the electric motor to move the needle valve body in the backward direction is defined as a reverse rotating direction; the motion conversion mechanism being so arranged that, as a result of rotation of the electric motor in the normal rotating direction or in the reverse rotating direction, the needle valve body is moved in the forward direction or in the backward direction through the cam part and the cam pin by relative rotation of the cam pin with respect to the cam body;
wherein the cam part is constituted by: a spirally inclined side with which the cam pin is capable of coming into contact from the forward direction or from the backward direction; and a spring member for urging the cam pin in the forward direction or in the backward direction toward the spirally inclined side.

2. The electrically operated gas flow regulating valve according to claim 1 , wherein: the guide tube is arranged to be rotatable by the rotation of the electric motor; the guide tube is provided with a first spring shoe; and the spring member is interposed between the first spring shoe and a second spring shoe which is disposed in the needle valve body.

3. The electrically operated gas flow regulating valve according to claim 2 , wherein the cam pin is arranged to come into contact with the spirally inclined side from the backward direction, and wherein the first spring shoe is disposed at an end portion in the backward direction of the guide tube.

Assignees

• Rinnai Kk

Inventors

• Kuzuya Kotaro

Classifications

• F16K3/316

  Guiding of the slide · CPC title

• F16K31/52475 Primary

  comprising a sliding valve · CPC title

• F16K31/524

  with a cam · CPC title

• F16K31/528

  with pin and slot · CPC title

• F16K31/5286

  comprising a sliding valve · CPC title