FLUID CIRCUIT AND REFRIGERATION CYCLE APPARATUS USING THE SAME

摘要

PURPOSE: A fluid circuit and a freezing cycle device using the same are provided to prevent the decrease of freezing efficiency without uniform distributing operation on lubricant. CONSTITUTION: A fluid circuit(100) comprises an upstream space, a downstream space, and a pump unit(3). The inner pressures of the upstream and downstream spaces repetitively change to low and high pressures. The entrance of the pump unit is connected to the upstream space and the exit of the pump unit is connected to the downstream space. The pump unit comprises two check valves(31). The check valves are serially arranged in a direction of allowing fluid flow from the upstream space to the downstream space. A middle unit(32) having a given volume is formed between the check valves.