Hitachi, Ltd.

Kenichi Chonan

Tosikazu Ito

Kiyoshi Horibe

Kiyomi Komathuzaki

Atsushi Suginuma

Tsuneo Kagohata

Akira Tezuka

Takao Teranishi

Hideo Usui

Yoshikazu Aochi

Kiyomi Honma

A vacuum actuator having a vacuum chamber and an atmospheric chamber separated from each other by a diaphragm, and an actuator rod connected at one end to the diaphragm and extending across the atmospheric chamber to the outside of the actuator so as to be connected to an object to be actuated. At least one annular solenoid coil is mounted on the upper surface of the upper wall of the case defining the vacuum chamber, with the axis of the solenoid coil extending substantially at a right angle to the axis of the actuator rod. A plunger of the annular solenoid coil is adapted to be moved in one and the other directions along the axis of the annular solenoid coil. The end of the plunger is adapted to be moved into and out of a control pressure chamber of valve case. A port for introducing a vacuum from a vacuum passage into the control pressure chamber and a port for introducing the atmospheric pressure into the same are formed in the valve case coaxially with each other. A valve member disposed between these ports and displaceable by the plunger selectively opens and closes these ports. The pressurized fluid in the control pressure chamber is introduced into the vacuum chamber through a passage interconnecting the control pressure chamber and the vacuum chamber, to thereby produce a force which acts on the diaphragm.

Vacuum actuator

An air conditioning method for controlling a room temperature by an air conditioner which controls a temperature control element in accordance with a required cooling power in the room. A temperature of chilled air blown out of a chilled air blow-off port of the air conditioner is directly or indirectly monitored, and if the chilled air temperature is lower than a predetermined temperature, the chilled air blown out of the blow-off port is prevented from becoming colder than a predetermined temperature even when the chilled air temperature would become lower than the predetermined temperature if the temperature control in accordance with the required cooling force in the room is applied.

Temperature control method and apparatus for air conditioner

A vacuum actuator having a vacuum chamber and an atmospheric chamber separated from each other by means of a diaphragm, and an actuator rod connected at its one end to the diaphragm and extending across the atmospheric chamber to the outside of the actuator so as to be connected to an object to be actuated. An annular solenoid coil is mounted on the upper surface of the upper wall of the case defining the vacuum chamber, in such a manner that the axis of the solenoid coil extends substantially at a right angle to the axis of the actuator rod. A plunger disposed in the annular solenoid coil is adapted to be moved in one and the other directions along the axis of the annular solenoid coil. The end of the plunger is adapted to be moved into and out of a valve case in which is defined a control pressure chamber. A port for introducing a vacuum from a vacuum passage into the control pressure chamber and a port for introducing the atmospheric pressure into the same are formed in the valve case coaxially with each other. A valve member disposed between these ports is adapted to be displaced by the plunger so as to selectively open and close these ports. The pressurized fluid in the control pressure chamber is introduced into the vacuum chamber through a passage interconnecting the control pressure chamber and the vacuum chamber, thereby to produce a force which acts on the diaphragm.

A temperature controlling apparatus is provided for use in systems such as a motor vehicle air conditioner. In the temperature controlling apparatus, a cycling clutch and a re-heated air mixing system are selectively used in accordance with the environmental condition. The cycling clutch system temperature control is effected in summer season to control an operating period of time of a compressor, and the re-heated air mixing system temperature control is effected in spring or autumn season to dehumidify the air and in winter season by means of an air mixing door after stopping the compressor thereby controlling an amount of the intake air which is to be re-heated.

Temperature control apparatus for a motor vehicle air conditioner

A variable stage type carburetor having an intake passage, a throttle valve disposed in the intake passage, and a movable vane disposed at the upstream side of the throttle valve, the movable vane being adapted to cooperate with the wall of the intake passage in constituting a variable venturi and operatively connected to the throttle valve, so as to be moved in response to the movement of the throttle valve. The carburetor further has a first vane controller adapted for displacing the movable vane in the closing direction, independently of the throttle valve, when the venturi vacuum is lowered, and a second vane controller adapted to displace the movable vane in the closing direction, also independently of the throttle valve, when the force exerted by the intake air flow on the movable vane drops below a predetermined level.

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Katsuta, Japan

Kenichi Chonan