Hydraulic pressure protecting circuit for compressor for refrigeration

Abstract

Abstract PURPOSE:To prevent the seizing of a sliding part for the compressor due to the decrease of the hydraulic pressure by a method wherein a delay relay is operated to start or stop the compressor intermittently when the hydraulic pressure is not rising up after a given time is elapsed. CONSTITUTION:When the hydraulic pressure has not risen up after the given time Ta has been elapsed, the delay relay T is operated at a time t1. As a result, a contact T2 is opened and the contacts of a twin timer TT are made active, therefore, a main relay MC is excited intermittently. According to the excitation, the compressor CM repeats starting and stopping intermittently so as to be rotated for 7sec and stopped for 5sec, for example. Thus, the compressor is started and stopped intermittently, therefore, the danger of seizing of the sliding part of the compressor due to the decrease of hydraulic pressure may be reduced compared with the case, in which the compressor is operated continuously.

Inventors

• 👤 Toshiyuki Keida
• 👤 慶田　敏行

Bibliographic Details