Mitsubishi Electric Corporation

Azbil Corporation

Keisuke Narumi

Takashi Nomiyama

Fumikazu Nagaoka

Teruhiko Nishiki

Toru Kashima

Satoshi Yuzawa

Hiroyasu Takahashi

Masashi Myogahara

Yosuke Tsuruoka

A scroll compressor includes a first chamfered portion formed at a distal end portion of a spiral blade of a fixed scroll, a second chamfered portion formed at a distal end portion of a spiral blade of an orbiting scroll, a third chamfered portion formed at a bottom portion of the spiral blade of the fixed scroll, and a fourth chamfered portion formed at a bottom portion of the spiral blade of the orbiting scroll. An expression of 0&#x3c;{(Av+Av)/2}/Ac&#x3c;1&#xd7;10is satisfied where a sectional area of a space between the first chamfered portion and the fourth chamfered portion is defined as Av, a sectional area of a space between the second chamfered portion and the third chamfered portion is defined as Av, and a sectional area of a compression chamber is defined as Ac.

Scroll compressor with different chamfered corners

A scroll compressor includes a sealed container, a compression mechanism portion for a refrigerant, a compliant frame and a guide frame which support an orbiting scroll, an electric motor which drives the orbiting scroll, balance weights, a refrigerant flow path which introduces a refrigerant gas discharged through a discharge port of a fixed scroll to a bottom portion of the sealed container, cup-shaped members provided on both upper and lower surfaces of the rotor of the electric motor and contain the balance weights, a penetrating flow path through which the refrigerant gas containing a refrigerating machine oil flows from a lower side of the rotor of the electric motor through the interiors of the cup-shaped members to an upper side of the rotor, and a discharge cover which is provided at a lower portion of the frame, and which introduces the refrigerant gas to a discharge pipe.

Scroll compressor

In a positioner, a driving signal IM is set to IMMIN (the minimum), a valve opening position A after the valve has then settled is stored, the driving signal IM is set to IMMAX (the maximum), a valve opening position B after the valve has then settled is stored, and the valve opening positions up until the opening of the valve arrives at the valve opening position B from the valve opening position A are stored together with the elapsed times as time series position information J, where, based on this stored time series position information J, the time for the opening of the valve to traverse between two prescribed valve opening positions that are established in the interval between the valve opening position A and the valve opening position B is calculated as a first response time Tup.

Positioner

A parameter acquiring device for acquiring parameters for a control valve has a controlling valve operating unit, a valve opening signal acquiring unit and a parameter calculator. The controlling valve operating unit operates a controlling valve in an opening direction and in a closing direction by changing, in a specific sequence, a control signal that controls an opening of a regulator valve. The valve opening signal acquiring unit acquires a signal indicating an actual opening of the regulator valve. The parameter calculator acquires data pairs of control signals and valve opening signals. The parameter calculator calculates a parameter of the control valve based on the data pairs that have been acquired.

Growing community of inventors

Tokyo, Japan

Keisuke Narumi