Patent ID: 9644867
Date: 2017-05-09
CPC Classifications: F25B

Claim:
1. A rotary valve used for a multivalve type pulse tube refrigerator having a first stage pulse tube, a second stage pulse tube, and a regenerator, the rotary valve comprising: a stationary seat having a face; a rotary disk configured to change a coolant path by rotating while surface-contacting with the face of said stationary seat; a plurality of regenerator ports provided in the face of said stationary seat in order to supply a high-pressure coolant to said regenerator and exhaust a low-pressure coolant from said regenerator; a first-stage pulse tube port provided in the face of said stationary seat and connected to said first-stage pulse tube so as to supply the high-pressure coolant to said first stage pulse tube and exhaust the low-pressure coolant from said first-stage pulse tube; and a second-stage pulse tube port provided in the face of said stationary seat and connected to said second-stage pulse tube so as to supply the high-pressure coolant to said second-stage pulse tube and exhaust the low-pressure coolant from said second-stage pulse tube; wherein all of said regenerator ports are arranged in a first circular track area having a first radius from a center of the face of said stationary seat in rotation symmetry with respect to the center of the face of said stationary seat, said first-stage pulse tube port and said second-stage pulse tube port are arranged in said first track area in rotation symmetry with respect to the center of the face of said stationary seat, each of said regenerator ports has a circular shape, each of said first-stage pulse tube port and said second-stage pulse tube port has an elongated circular shape, which is elongated in a circumferential direction of the face of said stationary seat.