Electromagnetic valve

A compressor comprising a housing including a suction chamber, a discharge chamber and a crank chamber, a rotary shaft supported by the housing, a rotor rotating integrally with the rotary shaft in the crank chamber, a cam plate tiltably supported on the rotary shaft in the crank chamber, a hinge mechanism for coupling the rotor with the cam plate, a cylinder bore defined in the housing, a piston reciprocally housed in the cylinder bore, wherein the rotation of the rotary shaft is converted into reciprocation of the piston by the rotor, the hinge mechanism and the cam plate, wherein the reciprocation of the piston draws refrigerant into the cylinder bore through the suction chamber, and wherein refrigerant is compressed in the cylinder bore and is discharged to the discharge chamber, the compressor further comprising:

• a suction passage defined in the housing to introduce refrigerant into the suction chamber from the outside;
• a shutter moving in accordance with inclination of the cam plate to open and to close the suction passage;
• a supply passage connecting the crank chamber with the discharge chamber;
• a control valve for opening and closing the supply passage, and wherein the control valve comprises:
• a valve housing;
• a valve chamber having a valve hole constituting a part of the supply passage;
• a valve body accommodated in the valve chamber for selectively closing and opening the valve hole;
• a first spring for urging the valve body in a direction opening the valve hole;
• an actuator for generating force in a direction closing the valve hole;
• a first rod for transmitting the force of the actuator to the valve body;
• a sensing chamber defined in the valve housing independently from the valve chamber to receive refrigerant from the suction passage;
• a pressure sensing member located in the sensing chamber for sensing the pressure in the sensing chamber, said pressure sensing member having a peripheral wall;
• a second rod for transmitting the pressure sensed by the pressure sensing member to the valve body;
• and
• means for maintaining a predetermined orientation of the pressure sensing member and preventing the peripheral wall of the pressure sensing member from contacting the valve housing, wherein the valve body is moved based on the refrigerant pressure sensed by the pressure sensing member, the force of the first spring and on the force of the actuator.

A control valve that controls flow of fluid between a first passage and a second passage by selectively connecting and disconnecting the first passage and the second passage, the valve comprising:

• a valve housing;
• a guide formed by a side wall of the housing;
• a valve chamber having a valve hole connected with the first passage and the second passage;
• a valve body accommodated in the valve chamber for selectively closing and opening the valve hole;
• a first spring for urging the valve body in a direction opening the valve hole;
• an actuator for generating force in a direction closing the valve hole;
• a first rod for transmitting the force of the actuator to the valve body;
• a sensing chamber having a base located at the lower end of the sensing chamber, the sensing chamber defined in the valve housing independently from the valve chamber to receive fluid from outside of the control valve;
• a pressure sensing member located in the sensing chamber for sensing the pressure in the sensing chamber, said pressuring sensing member having a peripheral wall, at least one bellows and cover, the sensing chamber base fixed to a lower end of the bellows and the cover fixed to an upper end of the bellows;
• a second rod for transmitting the pressure sensed by the pressure sensing member to the valve body;
• and
• a support structure having a first space between the cover and the guide and a second space between the bellows and a cylindrical side wall portion of the housing surrounding the bellows, the first space being smaller than the second space thereby causing the pressure sensing member to axially align with the second rod and preventing the peripheral wall of the pressure sensing member from contacting the valve housing, wherein the valve body is moved based on the fluid pressure sensed by the pressure sensing member, the force of the first spring and on the force of the actuator.

A control valve that controls flow of fluid between a first passage and a second passage by selectively connecting and disconnecting the first passage and the second passage, the valve comprising:

• a valve housing;
• a valve chamber having a valve hole connected with the first passage and the second passage;
• a valve body accommodated in the valve chamber for selectively closing and opening the valve hole;
• a sensing chamber defined in the valve housing independently from the valve chamber to receive fluid from outside of the control valve;
• a pressure sensing member located in the sensing chamber for sensing the pressure in the sensing chamber, said pressure sensing member having a peripheral wall;
• a pressure sensing rod for transmitting the pressure sensed by the pressure sensing member to the valve body;
• and
• means for maintaining a predetermined orientation of the pressure sensing member and preventing the peripheral wall of the pressure sensing member from contacting the valve housing.