US 12,442,463 B2
Valve opening circuit and heat pump device
Yuuta Iyoshi, Osaka (JP); Yoshiki Yamanoi, Osaka (JP); and Kumiko Saeki, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Sep. 15, 2022, as Appl. No. 17/945,567.
Application 17/945,567 is a continuation of application No. PCT/JP2020/045626, filed on Dec. 8, 2020.
Claims priority of application No. 2020-073358 (JP), filed on Apr. 16, 2020.
Prior Publication US 2023/0019373 A1, Jan. 19, 2023
Int. Cl. F25B 41/20 (2021.01); F16K 31/04 (2006.01); F25B 30/00 (2006.01); H02J 9/06 (2006.01)
CPC F16K 31/042 (2013.01) [F25B 30/00 (2013.01); F25B 41/20 (2021.01); H02J 9/061 (2013.01); F25B 2600/25 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A valve opening circuit mounted on a heat pump device including a liquid-side shutoff valve, a gas-side shutoff valve, an outdoor expansion valve, a first expansion valve and a second expansion valve on a refrigerant circuit, the valve opening circuit comprising:
a DC electric path to which a DC voltage generated from an AC voltage for normal use is applied;
a valve drive circuit that opens and closes the liquid-side shutoff valve, the gas-side shutoff valve, the outdoor expansion valve, the first expansion valve and the second expansion valve by using the DC voltage of the DC electric path;
a computer that acquires a control power source voltage based on the DC voltage of the DC electric path and controls the valve drive circuit; and
a power feed port connected to the DC electric path and connectable to a DC power source line provided from outside for emergency, wherein
the computer causes the valve drive circuit to open the liquid-side shutoff valve, the gas-side shutoff valve, the outdoor expansion valve, the first expansion valve and the second expansion valve when the AC voltage is lost and the DC voltage is fed from the DC power source line to the power feed port, such that the liquid-side shutoff valve, the gas-side shutoff valve, the outdoor expansion valve, the first expansion valve and the second expansion valve are simultaneously open.