Abstract: An example impeller includes: an impeller body in which an internal channel is formed, the internal channel extending inside the impeller body in a direction of a rotation axis spirally about the rotation axis to connect an inlet and an outlet; and at least one centrifugal vane provided in the impeller body. The internal channel including the inlet and the outlet has a predetermined passage diameter. An external channel is formed so as to continue to the outlet and go around the circumferential surface of the impeller body, the external channel being defined by the centrifugal vane and being recessed inward in the radial direction from the circumferential surface of the impeller body. At least a part in a flow direction of the external channel has a channel width in the direction of the rotation axis smaller than the width of the outlet.

Abstract: A centrifugal pump impeller 11 includes an impeller body in which an inner channel 35 is formed, and a single centrifugal vane 37 provided in the impeller body so as to have a leading edge at an outlet and a trailing edge at a predetermined point of an outer periphery of the impeller body. The centrifugal vane 37 is designed so that the area of an outer channel 36, which is defined by the centrifugal vane 37, in an angle range of 270° in a peripheral direction from the trailing edge of the centrifugal vane 37 to the total area of the impeller body surrounded by the outer periphery of the impeller body is less than 0.3.

Abstract: In an impeller 11, an inlet portion and an outlet portion are provided at one end side and the other end side in the axial direction, respectively. An inlet 29 is formed in the lower part of the inlet portion, and an outlet is formed in the side face of the outlet portion. The inlet portion and the outlet portion are partitioned by a flange portion 40. The impeller 11 includes a primary vane 36 and a secondary vane 38. The primary vane 36 defines a spiral primary channel 35 that connects the inlet 29 and the outlet. The secondary vane 38 is formed in a shape that a part of the outer periphery of the outlet portion is gouged inward so as to define a secondary channel 37 connected to the primary channel 35 and extending circumferentially around the outer periphery.

Abstract: An example impeller includes: an impeller body in which an internal channel is formed, the internal channel extending inside the impeller body in a direction of a rotation axis spirally about the rotation axis to connect an inlet and an outlet; and at least one centrifugal vane provided in the impeller body. The internal channel including the inlet and the outlet has a predetermined passage diameter. An external channel is formed so as to continue to the outlet and go around the circumferential surface of the impeller body, the external channel being defined by the centrifugal vane and being recessed inward in the radial direction from the circumferential surface of the impeller body. At least a part in a flow direction of the external channel has a channel width in the direction of the rotation axis smaller than the width of the outlet.

Abstract: An air conditioning system includes an air conditioner for blowing conditioned air toward a compartment of a vehicle, and a dashboard having a design surface exposed to the compartment. An inner air passage extending nearly parallel to the design surface is formed in the dashboard, and a plurality of diffusion blowing openings are formed in the design surface. Thus, the condensed air is blown from the diffusion blowing openings into the compartment of the vehicle, while passing through the inner air passage. For example, cool air is blown from the diffusion blowing openings, so that the cool air can cool the dashboard while cooling the compartment of the vehicle. Moreover, because the cool air passes through the inner air passage extending nearly parallel to the design surface, the dashboard can be effectively cooled.

Abstract: In an impeller 11, an inlet portion and an outlet portion are provided at one end side and the other end side in the axial direction, respectively. An inlet 29 is formed in the lower part of the inlet portion, and an outlet is formed in the side face of the outlet portion. The inlet portion and the outlet portion are partitioned by a flange portion 40. The impeller 11 includes a primary vane 36 and a secondary vane 38. The primary vane 36 defines a spiral primary channel 35 that connects the inlet 29 and the outlet. The secondary vane 38 is formed in a shape that a part of the outer periphery of the outlet portion is gouged inward so as to define a secondary channel 37 connected to the primary channel 35 and extending circumferentially around the outer periphery.

Abstract: In a vehicle air conditioner, a blower case for accommodating a blower is connected to an air conditioning case for accommodating an evaporator and the like by a connection duct made of a vibration-absorption material. Therefore, a vibration, transmitted from the blower case to the air conditioning case, can be effectively absorbed by the connection duct, thereby reducing the vibration transmitted from the air conditioning case to a steering wheel unit through a supporting member.

Abstract: An air conditioning system includes an air conditioner for blowing conditioned air toward a compartment of a vehicle, and a dashboard having a design surface exposed to the compartment. An inner air passage extending nearly parallel to the design surface is formed in the dashboard, and a plurality of diffusion blowing openings are formed in the design surface. Thus, the condensed air is blown from the diffusion blowing openings into the compartment of the vehicle, while passing through the inner air passage. For example, cool air is blown from the diffusion blowing openings, so that the cool air can cool the dashboard while cooling the compartment of the vehicle. Moreover, because the cool air passes through the inner air passage extending nearly parallel to the design surface, the dashboard can be effectively cooled.

Abstract: In a vehicle air conditioner, a blower case for accommodating a blower is connected to an air conditioning case for accommodating an evaporator and the like by a connection duct made of a vibration-absorption material. Therefore, a vibration, transmitted from the blower case to the air conditioning case, can be effectively absorbed by the connection duct, thereby reducing the vibration transmitted from the air conditioning case to a steering wheel unit through a supporting member.

Abstract: A compressor is prevented from the problem of seizure at start-up even when return of lubricant to the compressor is delayed. In such a refrigerant cycle, a bypass passage bypasses an expansion member and an evaporator. The bypass passage opens for a predetermined time when the compressor starts. The predetermined time is dependent upon external temperature, the compressor speed, compressor capacity, etc.

Abstract: In a method for calculating torque for a variable capacity type compressor provided in a refrigeration circuit and driven by an engine to compress and discharge refrigerant to be circulated through a heat exchanger in the refrigerant circuit, a rotational speed of the compressor is calculated, a quantity of refrigerant discharged from the compressor and pressure of refrigerant in high-pressure side are calculated, a capacity of the discharged refrigerant during operation of the compressor is calculated based on the calculated discharged refrigerant quantity and the calculated rotational speed, and the torque is calculated based on the calculated refrigerant pressure and the calculated capacity.

Abstract: In a method for calculating torque for a variable capacity type compressor provided in a refrigeration circuit and driven by an engine to compress and discharge refrigerant to be circulated through a heat exchanger in the refrigerant circuit, a rotational speed of the compressor is calculated, a quantity of refrigerant discharged from the compressor and pressure of refrigerant in high-pressure side are calculated, a capacity of the discharged refrigerant during operation of the compressor is calculated based on the calculated discharged refrigerant quantity and the calculated rotational speed, and the torque is calculated based on the calculated refrigerant pressure and the calculated capacity.

Abstract: In idling speed control system for an engine, for use with a refrigeration circuit for circulating refrigerant through a variable capacity type compressor driven by the engine, a condenser and an evaporator, an idling adjuster is provided to adjust a quantity of an air flow bypassing a throttle valve disposed in a suction passage of the engine and sucked into a combustion chamber of the engine. The control system is arranged to detect Numerical information required for calculating a first influence degree given to an output of the engine by the compressor during operation of the refrigeration circuit, to estimate, in accordance with the numerical information, a second influence degree which will be given to the engine output by the compressor under condition that the engine drives the compressor at a predetermined idling speed and the refrigeration circuit is maintaining cooling ability in a predetermined state.

Abstract: An automotive air conditioning system has refrigeration devices, heating devices and a single chip microcomputer. The refrigeration devices include a variable displacement refrigeration compressor drivingly connectable by an electromagnetic clutch to an automotive engine and a refrigerant evaporator disposed in an air duct, through which air is caused to flow by a blower. The heating devices include a heater core disposed downstream of the refrigerant evaporator, through which heated air is caused to flow, and an air mixing damper which regulates the quantity of air to be introduced into the heater core. A condition relating to the air conditioning operation such as the temperature of the vehicle is detected by a sensor. The microcomputer receives the signals from the sensor, calculates a required injection temperature, compares the required injection temperature and a preset standard temperature, a lower standard temperature and a higher standard temperature and produces operating signals.

Abstract: A refrigeration system for use in an automotive air conditioning system has a vane type variable displacement refrigerant compressor drivingly connectable by an electromagnetic clutch to an automotive engine, a refrigerant evaporator through which air is caused to flow by a blower, and a pressure check valve which prevents the refrigerant pressure in the evaporator from lowering under the predetermined pressure, so that frost or icing is not formed on the evaporator fins. The compressor is provided with one or two unloading ports for releasing the refrigerant being compressed and with a valve member or members associated with the unloading port. The refrigerator temperature and the pressure of the refrigerant in the conduit between a throttling valve and the compressor are detected. A signal is emitted to an electric circuit for actuating the valve member or members so that the unloading port is selectively opened to vary the compressor displacement to provide a multi-stage compressor displacement control.

Abstract: A refrigeration system for an automotive air conditioner includes an evaporator and a variable displacement refrigerant compressor adapted to be driven by an automotive engine. In order to control the refrigeration system, detectors are provided to detect a condition related to the cooling operation of the evaporator, such as air temperature just downstream of the evaporator or the refrigerant pressure, and to detect air temperature in the occupant compartment of the automobile, ambient air temperature outside the automobile or intake air temperature upstream of the evaporator. Signals emitted by the detectors are utilized to control the compressor operation such that the displacement capacity of the compressor is varied stepwise and the compressor is operated intermittently whereby the load on the engine is reduced and the frosting of the evaporator is prevented.

Abstract: A variable capacity compressor has a low-pressure chamber, a high-pressure chamber receiving the discharge of some cylinders and a discharge chamber receiving the discharge of other cylinders. An on-off valve between the discharge chamber and low-pressure chamber is actuated by an electric device, such as a servo motor. An electric circuit controls the servo motor so that it is driven for a certain time period in response to a signal to change the compressor capacity. A device operative with the on-off valve moves the valve forward or backward according to the rotation of the servo motor and makes the motor idle when it reaches the fore or back end of movable space.

Abstract: An automotive air conditioner has an air duct in which a refrigerant evaporator of a refrigeration cycle is disposed in fluid-flow communication with a variable capacity refrigerant compressor driven by an automotive engine and provided with compressor displacement varying members. A blower is provided to cause air to flow through the evaporator and through the duct into the passenger compartment. A sensor is provided to detect a condition representing the cooling operation of the evaporator, such as the air temperature downstream of the evaporator, surface temperature thereof or the pressure of the refrigerant at the evaporator. An electric controlling circuit is operative in response to signals from the sensor to actuate a servo motor which in turn drives the compressor displacement varying members whereby the capacity of the compressor is varied in accordance with the condition detected by the sensor.