JPH0163946U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a pressure control flowchart in a heat pump device according to an embodiment of this invention, Fig. 2 is an overall configuration diagram of a conventional general heat pump device, and Fig. 3 is a control of a heat pump device according to an embodiment of this invention. Similarly, FIG. 4 is a block diagram showing a main part control circuit diagram of a conventional general heat pump device, and FIG. 5 is a pressure control flowchart of a conventional heat pump device. In the figure, 1a and 1b are compressors, 2 is a switching valve, 3a and 3b are indoor heat exchangers, 4 is a pressure reducing device, and 5 is a
1 is an outdoor heat exchanger, 6 is an accumulator, 7 is an oil separator, 8 is a solenoid valve provided in the bypass path 9, 1
2 is a pressure detection device, 102 is a means for controlling the number of operating compressors, 103 is a solenoid valve control means, and 104 is a timer means. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A refrigerant circuit in which two compressors connected in parallel, a switching valve, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and an accumulator are connected in a ring with piping,
an oil separator provided between the discharge side of the compressor and the switching valve; a bypass path leading from the oil separator to the accumulator via a solenoid valve; and a predetermined discharge pressure of the compressor. A pressure detection device detects whether or not the pressure is above the predetermined pressure value.The pressure detection signal of this pressure detection device is input, and when the discharge pressure of the compressor is above the predetermined pressure value, the number of operating compressors is determined. A means for controlling the number of operating compressors, which is one, receives the pressure detection signal of the pressure detection device as an input, and opens the solenoid valve when the discharge pressure of the compressor is equal to or higher than the predetermined pressure value, and also controls the predetermined pressure value. The operating time of one compressor after the discharge pressure of the compressor becomes equal to or higher than the predetermined pressure value, with input of the solenoid valve control means that closes the solenoid valve when less than the predetermined pressure value, and the pressure detection signal of the pressure detection device. is measured, and the discharge pressure of the compressor rises to a predetermined pressure value or higher, the number of compressors in operation is reduced to one, and the solenoid valve is opened, and then the discharge pressure is lower than the predetermined pressure value. A heat pump device characterized in that the heat pump device is equipped with a timer means for causing one of the compressors to continue operating for a predetermined period of time when the solenoid valve is closed.