Provided is a variable-capacity compressor control valve that can effectively reduce sliding resistance while preventing Pd-Ps leakage and the inclination of a valve element, thus increasing controllability and operation stability, and can also avoid operation failures or troubles caused by foreign matter. A sliding portion of a main valve element that is slidably fitted and inserted into a guide hole provided in a valve body includes an upper small-clearance portion and a lower small-clearance portion in the opposite ends in a vertical direction thereof and a large-clearance portion between the upper small-clearance portion and the lower small-clearance portion. The upper small-clearance portion and the lower small-clearance portion each has a diameter Dx and a vertical length that is equal to or larger than a predetermined length. The large-clearance portion has a diameter Dy that is smaller than the Dx and a vertical length of 1 mm or larger.

A swash plate compressor includes a cylinder block accommodating a piston for compressing a refrigerant, a front housing coupled to the cylinder block and having a crank chamber, a rear housing having a suction chamber and a discharge chamber and coupled to the cylinder block, and a suction reed plate inserted between a valve plate and the cylinder block. The swash plate compressor includes: a first orifice hole through which the refrigerant in the crank chamber passes; a second orifice hole communicating between the first orifice hole and the suction chamber; an intermediate flow path configured to connect the first orifice hole and the second orifice hole; and the valve plate inserted into the rear housing and having a suction chamber pressure-maintaining space connected to the suction chamber and configured to maintain a pressure equal to a pressure in the suction chamber.

A rotary type valve plate compressor may include a shaft, a housing through which the shaft passes, a plurality of cylinders mounted in the housing, a piston received in the cylinder and to be moved forward and rearward in response to rotational operation of a swash plate, and a rotary type valve plate to receive a rotational force of the shaft and to open and close a refrigerant passage hole through which refrigerant passes, based on a phase of the piston.

A control device of a compressor includes a piston which reciprocates by a swash plate, a crankcase receiving the swash plate mounted such that an inclination angle thereof is variable, a discharge chamber from which a compressed working fluid is discharged, a suction chamber sucking the working fluid to be compressed, a first communication channel connecting the suction chamber and the crankcase, a second communication channel connecting the discharge chamber and the crankcase, and a control valve which selectively opens and closes the first communication channel and the second communication channel. The control device includes a suction pressure sensor measuring a pressure of the suction chamber, a valve control unit determining a target suction pressure on the basis of the value measured by the suction pressure sensor and a set temperature, and a valve driving unit controlling the opening degree of the control valve to achieve the target suction pressure.

A variable-capacity compressor control valve that can efficiently cancel the influence of the refrigerant pressure acting on a main valve element and avoid increase in complexity of the structure and size of the control valve is provided. A pressure equalizing passage is provided which is adapted to guide a pressure Pc in a crank chamber acting on the lower end of a main valve element to a pressure-sensitive chamber so that the pressure Pc in the crank chamber acts on the upper end of the main valve element. When an electromagnetic actuator or a solenoid portion thereof is not supplied with current i.e., when a valve orifice is fully open, the introduction of a suction pressure Ps from Ps inlet/outlet ports Ps inlet/outlet chamber into the pressure-sensitive chamber is stopped, and the pressure Pc in the crank chamber is introduced into the pressure-sensitive chamber via the pressure equalizing passage so that the pressure Pc in the crank chamber acts on the upper and lower ends of the main valve element.

The present invention relates to a suction pulsation reducing device of a swash plate type compressor, and more particularly, to a suction pulsation reduction apparatus provided on a suction channel formed in a rear head of a swash plate type compressor, in which a moving range of a core portion is limited and all parts to be mounted on a suction channel are integrally formed in a case.

The inflating device has a body, a large cylinder, a small cylinder, a handle, a switching mechanism, and a switching device. The large cylinder is mounted moveably in the body and has an upper input gap, an inner bottom base, and a bottom base. The upper input gap is defined between an outer surface of a bottom end of the large cylinder and an inner surface of a first chamber of the body. The bottom base is connected with the large cylinder, is located below the inner bottom base, and has a first annular holding recess and a first O-ring. The small cylinder is mounted moveably in a second chamber of the large cylinder and has a piston base. The handle is mounted on the top end of the small cylinder. The switching mechanism is mounted on the top end of the large cylinder.

An axial piston device may be operated as a pump and includes a self-centering rotary valve. The device includes a stationary housing encompassing a shaft and the rotary valve. The rotary valve and the shaft are coupled to each other. Upon rotation, the rotary valve self-centers as a result of elimination of moments and forces within the pump. The inventive pump is a piston device. The valve is within a valve bore, which is a part of a manifold. A shaft is within the manifold and the shaft is attached at its distal end to a planar surface of the rotary valve. The shaft has a first axis of rotation and the rotary valve has a second axis of rotation. During operation of the pump, the first axis is often times offset from the second axis. The pump operates via a swashplate with reciprocating pistons while the housing remains stationary.

A capacity control valve includes a valve housing having a main valve seat portion formed on an inner peripheral surface, a main valve body that has a main valve portion capable of seating on the main valve seat portion and capable of blocking communication between a discharge port and a control port depending on a driving force of a solenoid, a relief valve that is opened by pressure, a first flow channel that allows the control port and a suction port to communicate with each other when the relief valve is opened. A second flow channel formed at least partially in parallel with the first flow channel allows the control port and the suction port to communicate with each other. A spool valve body is reciprocally disposed in a sleeve and capable of adjusting an opening of the second flow channel depending on the driving force of the solenoid.

A suction damping device for a variable displacement compressor includes a rotor rotatably received within a stator disposed in a suction port of the variable displacement compressor. The rotor includes an aperture and the stator includes a pair of opposing openings in selective fluid communication with the aperture of the rotor. An electromagnetic device controls a rotational position of the rotor relative to the stator based on a condition of an electrically controlled valve used to control an angle of inclination of a swashplate of the variable displacement compressor. A changing of the rotational position of the rotor relative to the stator causes a variable overlap to be formed between the aperture of the rotor and the openings of the stator to control a flow of a refrigerant through the suction damping device.