Global Patent Index - EP 3594587 A4

EP 3594587 A4 20200226 - HEAT PUMP HOT WATER SUPPLY DEVICE

Title (en)

HEAT PUMP HOT WATER SUPPLY DEVICE

Title (de)

WÄRMEPUMPENVORRICHTUNG ZUR WARMWASSERVERSORGUNG

Title (fr)

DISPOSITIF D'ALIMENTATION EN EAU CHAUDE D'UNE POMPE À CHALEUR

Publication

EP 3594587 A4 20200226 (EN)

Application

EP 17899425 A 20170309

Priority

JP 2017009418 W 20170309

Abstract (en)

[origin: EP3594587A1] The present invention is to reduce the maximum high pressure, as high-pressure suppression, by storing refrigerant in a refrigerant amount adjusting device at the time of inflow of water at high temperature and to avoid liquid compression by storing liquid back at the time of transition into the refrigerant amount adjusting device, thereby the reliability of a compressor being ensured. At the time of boiling, the opening degree of an expansion valve is adjusted such that a difference between a hot water target temperature and an inlet refrigerant temperature is equal to a temperature difference set in advance. When the temperature of fluid sent from a hot water tank to a condenser is high, the temperature difference is changed to adjust the valve opening degree of the expansion valve in an opening direction, so that concentration of refrigerant on a high-pressure side can be reduced and high-pressure suppression can thus be achieved. In contrast, concentration of refrigerant on a low-pressure side increases, and excess liquid refrigerant is thus stored in the refrigerant amount adjusting device. Furthermore, after an operation stops, in the case where restarting is performed immediately after liquid refrigerant is stored in the evaporator, if no refrigerant amount adjusting device is provided, liquid back to the compressor may occur, resulting in liquid compression. Thus, due to storage of refrigerant in the refrigerant amount adjusting device, liquid compression can be avoided, and the reliability of the compressor can thus be ensured.

IPC 8 full level

F24D 17/02 (2006.01); F24H 4/02 (2006.01); F24H 4/04 (2006.01); F25B 30/02 (2006.01); F25B 40/00 (2006.01)

CPC (source: EP)

F24D 17/02 (2013.01); F24H 4/04 (2013.01); F25B 30/02 (2013.01); F25B 40/00 (2013.01); F25B 2339/047 (2013.01); F25B 2500/12 (2013.01); F25B 2600/2513 (2013.01); F25B 2700/21161 (2013.01); F25B 2700/21162 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 3594587 A1 20200115; EP 3594587 A4 20200226; EP 3594587 B1 20210421; JP 6704505 B2 20200603; JP WO2018163345 A1 20190718; WO 2018163345 A1 20180913

DOCDB simple family (application)

EP 17899425 A 20170309; JP 2017009418 W 20170309; JP 2019504216 A 20170309