Thermally actuated hot and cold water mixing valve configured to minimize valve hunting

摘要

A hot and cold water mixing valve including a temperature adjusting dial, and a cylindrical casing having formed therein a hot water inlet and a cold water inlet is provided with a control valve member in which one end thereof is subjected to a load from a biasing member and the other end is subjected to a load from an actuator. By balancing between the loads applied by the biasing member and the actuator, a mixture ratio between the hot water which flows in through the hot water inlet and the cold water which flows in through the cold water inlet is adjusted. A temperature adjuster adjusts a position of the control valve member through the biasing member and includes a tapered skirt portion, which spreads in a radial direction, at an end on the control valve member side thereof.

主权项

1. A hot and cold water mixing valve, comprising:
a temperature adjusting dial which is subjected to temperature control operation, and a main body member having a control valve mechanism for adjusting temperatures of hot water and cold water by operating said temperature adjusting dial and a casing in which a hot water inlet and a cold water inlet are formed and said control valve mechanism is accommodated, wherein said main body member comprises: a biasing member made of a material having a fixed spring constant, an actuator which expands or shrinks according to a temperature change, a control valve member in which one end is subjected to a load from said biasing member and the other end is subjected to a load from said actuator, and an opening/closing ratio between said hot water inlet and said cold water inlet is changed by balancing between the loads applied by said biasing member and said actuator, to adjust a mixture ratio between the hot water which flows in through said hot water inlet and the cold water which flows in through said cold water inlet, and a temperature adjusting means whose one side is fixed to said temperature adjusting dial and whose other side is abutted against said biasing member which biases said control valve member, to apply a load to said control valve member according to rotation of said temperature adjusting dial, and to set up a position of said control valve member, and wherein a mixing chamber for mixing the cold water from said cold water inlet and the hot water from said hot water inlet is provided inside said casing, and said actuator is arranged in said mixing chamber, and an end on said control valve member side of said temperature adjusting means is provided between said hot water inlet and said cold water inlet, and spreads in a radial direction to reduce a channel area between said hot water inlet and said mixing chamber and to limit a flow rate of the hot water which flows into the mixing chamber, and wherein the end on said control valve member side is a tapered skirt portion which spreads in a radial direction gradually toward said mixing chamber from said hot water inlet.