Control valve driven by stepping motor

Patent metadata

Field	Value
Publication number	US-9366353-B2
Application number	US-201414226755-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Mar 29, 2013
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A control valve according to an embodiment includes: a body having an inlet port, an outlet port, and a valve hole that communicates the inlet port and the outlet port together; a valve element configured to open and close a valve section; a drive mechanism configured to drive the valve element; a stepping motor having both a rotor for operating the drive mechanism and a stator for rotationally driving the rotor; and a can that is a cylindrical member covering a space where the valve element and the drive mechanism are arranged and involving the rotor and that defines a pressure space and a non-pressure space. The can is fixed to the body with a ring screw, and the stator is arranged at an outer circumference of the can and fixed to the body with a screw member.

First claim

What is claimed is:

1. A control valve driven by a stepping motor, comprising:
a body having an inlet port for introducing a refrigerant from an upstream side, an outlet port for delivering a refrigerant to a downstream side, and a valve hole that communicates the inlet port and the outlet port together;
a valve element configured to open and close a valve section by moving toward and away from the valve hole;
a drive mechanism configured to drive the valve element in an opening and closing direction of the valve section;
a stepping motor including both a rotor for operating the drive mechanism and a stator for rotationally driving the rotor; and
a can that is a cylindrical member covering a space where the valve element and the drive mechanism are arranged and involving the rotor and that defines a pressure space where pressure of the refrigerant acts and a non-pressure space where pressure of the refrigerant does not act, wherein the can is fixed to the body with a first fixing means,
wherein the stator is arranged at an outer circumference of the can and fixed to the body with a second fixing means, and
wherein the second fixing means substantially does not fix the can.

2. The control valve according to claim 1 , wherein the second fixing means is a screw member.

3. The control valve according to claim 1 , wherein the second fixing means fixes the stator by using a first wall surface different from a second wall surface to which the can is fixed.

4. The control valve according to claim 1 , wherein the body has a flange portion extending in parallel to a fixing surface to which the can is fixed, and wherein the second fixing means fixes the stator to the flange portion.

5. The control valve according to claim 1 , wherein the first fixing means is a screw member.

6. The control valve according to claim 5 , wherein the screw member is an annular ring screw, and a lower end opening portion of the can is positioned between the ring screw and the body with a male thread, formed in an outer circumferential surface of the ring screw, being screwed with a female thread, formed in an inner circumferential surface of a storage hole formed in the body.

Assignees

• Tgk Co Ltd
• Tgk Co Ltd

Inventors

• Ooe Yuto
• Takahashi Kazushi
• Yuasa Tomohiro

Classifications

• F25B41/062

  Mechanical Engineering · mapped topic

• F16K31/04 Primary

  using a motor · CPC title

• Y02B30/72

  Cross-Sectional Technologies · mapped topic

• F25B2341/0653

  Mechanical Engineering · mapped topic

• F25B41/35

  by rotary motors, e.g. by stepping motors · CPC title