Patent ID: 8820654
Filing Date: 2014-09-02
Classification: B23P,F25B,Y10T

Abstract:
1. A method of forming a throttle passage in a refrigerant passage through which refrigerant of a refrigeration cycle flows, comprising: placing, on a step portion formed by expanding the refrigerant passage, a throttle passage member which is formed by machining a circular plate having a hole formed in a center thereof into a truncated conical shape and has an outer diameter a size of which is between respective inner diameters outward and inward of the step portion, such that a bulging side of the throttle passage member with respect to a plane including an outer periphery thereof faces toward an outer open end of the refrigerant passage; and squashing the throttle passage member from an expanded side of the refrigerant passage while pressing the throttle passage member against the step portion, to deform the throttle passage member such that the outer periphery of the throttle passage member is widened, thereby causing the throttle passage member to be fixedly engaged to an inner wall of the refrigerant passage.