Electrically operated valve

Patent metadata

Field	Value
Publication number	US-10975984-B2
Application number	US-201816492424-A
Country	US
Kind code	B2
Filing date	Feb 21, 2018
Priority date	Mar 31, 2017
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

An object of the present invention is to provide an electrically operated valve capable of more accurately detecting the position of a valve body.
In order to achieve the above object, the electrically operated valve of the present invention comprises a valve body, a driver configured to move the valve body along a first axis, a rotation shaft configured to rotate the driver around the first axis, a permanent magnet member, an angle sensor, and a yoke configured to cover a portion of the permanent magnet or a portion of the angle sensor. The permanent magnet member is disposed on the rotation shaft and configured to rotate with the rotation shaft. The angle sensor is configured to detect a rotation angle of a permanent magnet included in the permanent magnet member. The angle sensor is disposed above the permanent magnet.

First claim

The invention claimed is:

1. An electrically operated valve comprising:
a valve body;
a driver configured to move the valve body along a first axis;
a rotation shaft configured to rotate the driver around the first axis;
a permanent magnet member disposed on the rotation shaft and configured to rotate with the rotation shaft;
an angle sensor disposed above a permanent magnet included in the permanent magnet member and configured to detect a rotation angle of the permanent magnet;
a sensor yoke configured to cover a portion of the angle sensor; and
a case configured to contain the permanent magnet member,
wherein an end wall of the case is disposed between the angle sensor and the permanent magnet member,
the sensor yoke is configured to cover an upper surface or a side surface of the angle sensor, and an outer edge of the sensor yoke is located further inward than an outer edge of the permanent magnet in a plan view.

2. The electrically operated valve according to claim 1 , further comprising:
a magnet yoke configured to cover a portion of the permanent magnet; and
the magnet yoke is configured to cover a side surface of the permanent magnet.

3. The electrically operated valve according to claim 2 , wherein a boundary region between a north pole and a south pole of the side surface of the permanent magnet is exposed without being covered by the magnet yoke.

4. The electrically operated valve according to claim 3 , wherein the permanent magnet member is an insert molded body that includes the permanent magnet and the magnet yoke.

5. The electrically operated valve according to claim 2 , wherein the permanent magnet member is an insert molded body that includes the permanent magnet and the magnet yoke.

6. The electrically operated valve according to claim 1 , wherein a lower surface of the angle sensor is exposed without being covered by the sensor yoke.

7. The electrically operated valve according to claim 1 , further comprising:
a stator member that includes a coil;
a rotor member coupled to the rotation shaft so as to enable power transmission; and
a lower base member having a valve seat.

8. The electrically operated valve according to claim 1 , further comprising a control substrate configured to control a rotational movement of the rotation shaft.

Assignees

• Fujikoki Corp

Inventors

• Uehara Satoshi
• Arai Yusuke
• Hosoya Takeshi

Classifications

• F16K37/00

  Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given · CPC title

• F16K31/08

  using a permanent magnet · CPC title

• F16K31/046

  with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor (F16K31/041 takes precedence) · CPC title

• F16K31/042 Primary

  with electric means, e.g. for controlling the motor or a clutch between the valve and the motor · CPC title

• G01D5/145

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title