Mitsubishi Denki Kabushiki Kaisha

Hitoshi Kido

Masami Imanishi

Takeshi Yoshida

Yoshinobu Igarashi

Hideaki Tagashira

Katsumi Kasano

Junji Okabe

Yoshimichi Nakagawa

Shunsuke Ohara

An air conditioning system including a refrigerant circuit having a compressor, a three port switching valve, a four port reversing valve, an outdoor heat exchanger, a first throttle device including a first decompression device, a second throttle device including a first decompression device, an indoor heat exchanger and an accumulator connected in series by use of refrigerant pipes; a first bypass circuit which is constructed to carry out heat exchange with the intake pipe connecting between the accumulator and the compressor, and which is connected as a bypass to the pipe connecting between the first and second throttle devices; a second bypass circuit having a check valve to bypass the first decompression device; a third bypass circuit having a check valve to bypass the second decompression device; a fourth bypass circuit which is connected as a bypass to the pipe between the first and second throttle devices, and which is smaller than the discharge pipe in inside diameter; and a fifth bypass circuit which is connected as a bypass to the pipe between the first and second throttle devices through a pressure regulating valve; wherein the three port switching valve is switched to open the fourth bypass circuit, thereby carrying out defrosting.

Heating and cooling air conditioning system with improved defrosting

An air blower chamber includes a partition plate provided with an air intake opening, an air blower mounted on the partition plate so as to be detachable from the same through the air intake opening, a box for auxiliary parts and an air filter placed at an inlet opening of said main body. An air intake panel is detachably fitted to an opening of a ceiling which is spaced apart from and below the inlet opening and an air intake chamber for connecting the inlet opening to the opening of the ceiling. Accordingly, inspection and services for blades and the motor of a blower, auxiliary parts and air filter can be easily made by simply detaching the air intake panel without necessity of a worker to enter in the ceiling.

Ceiling-concealment type air conditioning apparatus

Growing community of inventors

Wakayama, Japan

Hitoshi Kido