US 7,007,917 B2Granted

Electromagnetic control valve

AssigneeLG Electronics Inc.

InventorsJung Hoon Choi, Young Joo Yee, Seong Hyok Kim, In Kyu Kim, Byeong Hwa Chung

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Abstract

An electromagnetic control valve having a permanent magnet and a needle are fitted in a cylindrical valve body, and a coil, and first and second yokes are mounted on an outside circumferential surface of the valve body. There are first and second ports in the valve body for making an outside space and an inside space of the valve body in communication. There is an orifice in the valve body for making the first and the second ports in communication. The needle is disposed at a position opposite to a side of the orifice, for moving in an up/down direction when a current is applied to the coil. Direction and amount of movement of the needle are dependent on a direction and an intensity of the current applied to the coil. When the needle moves, a tip of the needle varies an opened area of the orifice linearly, according to which a flow rate of the fluid passed through the orifice is controlled according to a position of the needle.

Claims44

Dependent claims

An electromagnetic control valve comprising:

a valve body having first and second ports for communicating an inside and an outside of the valve, an orifice inside thereof for making the first and the second ports in communication, and a space inside of an upper part thereof;
a permanent magnet fitted in the space to be movable in an up/down direction;
a coil connected to a circuit and wound on an outside circumferential surface of the valve body;
a first yoke fitted to surround the outside circumferential surface of the valve body at a position opposite to an upper part of the permanent magnet for sustaining a levitated state of the permanent magnet by a magnetic force;
and
a needle having a tapered tip disposed at a position opposite to a side of the orifice, for making linear variation of an opened area of the orifice while the needle moves together with the permanent magnet when the permanent magnet moves up or down by an electromagnetic force generated when a current is applied to the coil.

3 more elements

Dependencies are inferred from the claim text.