Electrically operated valve

Patent metadata

Field	Value
Publication number	US-10352475-B2
Application number	US-201815945785-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	Apr 12, 2017
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

The invention provides an electrically operated valve which can more accurately detect a position of a valve body. An electrically operated valve is provided with a valve shaft, a valve body, a rotor member which is movable together with the valve shaft in a parallel direction to a first direction, a stator member which applies a turning force to the rotor member, a permanent magnet member which turns together with the rotor member, an angle sensor which detects an angle of rotation of the permanent magnet, and a guide member which guides a relative movement of the rotor member or the valve shaft in relation to the permanent magnet member. A distance between the permanent magnet and the angle sensor is fixed when the permanent magnet member turns.

First claim

The invention claimed is:

1. An electrically operated valve comprising:
a valve shaft;
a valve body which is arranged in a first end portion of the valve shaft;
a rotor member which is rotatable around a rotor rotating shaft and is movable together with the valve shaft in a parallel direction to a first direction;
a stator member which applies a turning force to the rotor member;
a permanent magnet member which turns together with the rotor member;
an angle sensor which is arranged above a permanent magnet included in the permanent magnet member and detects an angle of rotation of the permanent magnet; and
a guide member which guides a relative movement of the rotor member or the valve shaft in relation to the permanent magnet member,
wherein the guide member is movable together with the rotor member in a parallel direction to the first direction and is rotatable together with the rotor member, and
wherein a distance between the permanent magnet and the angle sensor is fixed when the permanent magnet member turns.

2. The electrically operated valve according to claim 1 , further comprising:
a case which accommodates the rotor member; and
a first biasing member which biases the permanent magnet member in a direction toward an end wall of the case.

3. The electrically operated valve according to claim 2 , wherein the first biasing member is arranged between the permanent magnet member and the rotor member, or between the permanent magnet member and the guide member.

4. The electrically operated valve according to claim 2 , wherein a bearing member is arranged between the case and the permanent magnet member.

5. The electrically operated valve according to claim 1 , wherein the guide member has a second engagement portion which engages with a first engagement portion provided in the permanent magnet member, and
wherein the second engagement portion engages with the first engagement portion so as to be relatively non-rotatable and be relatively movable in the parallel direction to the first direction.

6. The electrically operated valve according to claim 1 , further comprising a second biasing member which makes the valve shaft and the rotor member contact with each other.

7. The electrically operated valve according to claim 1 , further comprising:
a lower base member; and
a rotor support member which is directly or indirectly fixed to the lower base member,
wherein a first thread portion of the rotor member and a second thread portion of the rotor support member are threadably mounted each other.

8. The electrically operated valve according to claim 1 , wherein the guide member is a second end portion of the valve shaft.

Assignees

• Fujikoki Corp

Inventors

• Uehara Satoshi
• Narukawa Bunta

Classifications

• Y10T137/8225

  Position or extent of motion indicator · CPC title

• H02K37/00

  Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors · CPC title

• F16K37/0033 Primary

  using a permanent magnet, e.g. in combination with a reed relays · CPC title

• Y10T137/8158

  With indicator, register, recorder, alarm or inspection means · CPC title

• Y10T137/8242

  Electrical · CPC title