Daikin Industries, Ltd.

Kazushige Maeda

Haruo Nakata

Tsunehisa Sanagi

Masakazu Hirai

Hironori Iwanaga

Akiyoshi Yamamoto

A fan drive circuitfor a heat pump device is provided. The heat pump device blows air heat exchanged by a heat exchanger using a mildly-flammable or flammable refrigerant having a specific gravity greater than that of air from a blowout port using a fan. The fan drive circuitis equipped with a forced operation circuit configured to operate the fan in the event that it is undetectable that a protection device for preventing a leaked refrigerant from the heat pump device from reaching a combustible density is connected to the heat pump device.

Fan drive circuit for heat pump device

A drain pump is provided that reduces the operating noise when the head is low. The drain pump has a pump casing, and an impeller. The pump casing has a drain inlet for sucking in drain water at a lower end part and a drain outlet for discharging drain water at a side part. The impeller has a shaft part disposed extending in a vertical direction inside the pump casing, a main blade disposed on the outer circumferential side of the shaft part, an auxiliary blade disposed on the lower side of the main blade, and a disc shaped dish part disposed between the main blade and the auxiliary blade. The dish part has an annular partition part extending upward from the outer circumferential edge part of the main blade, which is disposed at a position lower than the upper end part of the partition part.

Drain pump, and air conditioner provided therewith

A drain pump is provided that reduces the operating noise when the head is low. The drain pump has a pump casing, and an impeller. The pump casing has a drain inlet for sucking in drain water at a lower end part and a drain outlet for discharging drain water at a side part. The impeller has a shaft part extending in a vertical direction inside the pump casing, a main blade disposed on the outer circumferential side of the shaft part, an auxiliary blade disposed on the lower side of the main blade, and a disc shaped dish part disposed between the main blade and the auxiliary blade. The dish part has an annular partition part extending upward from the outer circumferential edge part of the main blade, which is disposed at a position lower than the upper end part of the partition part.

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Osaka, Japan

Kazushige Maeda