JPS6422972U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a refrigeration cycle according to an embodiment of this invention, Fig. 2 is a block diagram showing a defrosting control circuit of a refrigeration system according to an embodiment of this invention, and Fig. 3 is a diagram showing an embodiment of this invention. For the purpose of explanation, a relationship diagram showing the internal temperature, heat storage agent temperature, compressor operating time, bypass solenoid valve opening/closing state, and FIG. 4 is a flowchart showing the operation of the refrigeration system shown in FIGS. FIG. 5 is a refrigeration cycle configuration diagram of a conventional refrigeration system. In the figure, 1 is a compressor, 2 is a condenser, 3 is a throttle device, 4 is an evaporator, 10 is a high pressure side heat exchange path, 1
1 is a low pressure side heat exchange path, 9 is a heat storage tank, 9a is a heat storage agent, 23 is a defrosting start signal generation circuit, 22 is an internal temperature detector, 30 is a selection circuit, 21 is a compressor operation time integration circuit, 31 3 is a bypass pipe, and 32 is a bypass solenoid valve. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a refrigeration system equipped with a compressor, a condenser, a throttle device, an evaporator, heat exchange paths provided on the high-pressure side and low-pressure side, and a heat storage tank containing a heat storage agent, the output of the defrost start signal generation circuit Therefore, the expansion device is bypassed and the high temperature refrigerant discharged from the compressor is supplied to the evaporator to remove the tank,
and hot gas defrost means for supplying liquid refrigerant sent from the evaporator to the low-pressure side heat exchange path to cool the heat storage agent, and operation of the compressor by the output of a defrosting start signal generation circuit. An off-cycle defrost means to stop, an internal temperature detector to detect the internal temperature of the refrigerator or freezer, and when the internal temperature is above a predetermined temperature, the off-cycle defrost means is selected, and the internal temperature is set to a predetermined temperature. If the temperature is below the temperature, a selection circuit for selecting the hot gas defrost means, a compressor operating time integration circuit for integrating the operating time of the compressor, and a bypass solenoid valve that bypasses the high-pressure side heat exchange path. A refrigeration system comprising a bypass pipe provided therein, and opening the bypass solenoid valve when the internal temperature of the refrigerator is equal to or higher than the predetermined temperature and the cumulative operating time of the compressor exceeds the predetermined time.