| 摘要 |
<p>PURPOSE:To prevent the fluctuation of low pressure, generated by a pressure loss at the side of the low pressure, from bein delivered to the lower part of a diaphragm for an external pressure equilibrium system temperature type expansion valve through an external pressure equilibrium pipe by a method wherein the external pressure equilibrium system temperature type expansion valve for the solar heat-utilizing water heater is provided with a choking mechanism in the external pressure equilibrium pipe. CONSTITUTION:Refrigerant gas, compressed by a compressor 3, flows into a condenser 4 to heat low-temperature water sent by a circulating pump 11 and accumulate it in a heat accumulating tank 12. On the other hand, the refrigerant, whose condensing heat is deprived, flows into the external pressure equilibrium system temperature type expansion valve 5 and the pressure thereof is reduced, then, is returned to the compressor 3 through a heat collector 1 and an accumulator 2. When water temperature is increased and condensing pressure has increased, the pressure loss in the low pressure side is increased, the fluctuation of low pressure is delivered to the lower part of the diaphragm for the expansion valve 5 even though the temperature of a temperature sensing tube 7 is stabilized and hunting, regardless of the temperature of the temperature sensing tube, is generated, however, the width of low pressure fluctuation is reduced by the choking mechanism 13 arranged in the external pressure equilibrium pipe 6 and a stabilized low pressure is delivered to the lower part of the diaphragm, therefore, the hunting may be prevented.</p> |
