Abstract:
[Object of the Invention] An object of the present invention is to provide a reciprocating compressor comprising an aperture control valve for an inlet passage, wherein installation of the aperture control valve is easy, sufficient sectional area of the inlet passage is maintained near the outlet holes of the aperture control valve, distribution of flaw rates of refrigerant gas sucked into the cylinder bores during inlet stroke is even, and the inlet chamber operates as a muffler to make it possible to optimize the structure of the aperture control valve from the viewpoint of decreasing inlet pressure pulsation.[Disclosure of the Invention ] A reciprocating compressor comprises a cylinder block provided with a plurality of cylinder bores, a valve plate opposing one end of the cylinder block at one end face and provided with a plurality inlet hole and outlet hole pairs each opposing one of the cylinder bores, and a cylinder head opposing the other end face of the valve plate and forming at the other end face side of the valve plate an annular outlet chamber and a cylindrical inlet chamber disposed radially inside the outlet chamber, wherein the cylinder head is provided with an inlet passage extending from the inlet chamber to connect with an external refrigerating circuit and an outlet passage extending from the outlet chamber to connect with the external refrigerating circuit, and further comprises an aperture control valve provided with an inlet hole connecting with the inlet passage and outlet holes communicating with the inlet chamber and controlling the aperture of the inlet passage in proportion to the pressure difference between the internal pressure of the inlet passage and the internal pressure of the inlet chamber, wherein the aperture control valve is disposed in the inlet chamber, and the aperture control valve engages the end wall of the inlet chamber opposing the valve plate at one end provided with the inlet hole and projects from the end wall of the inlet chamber toward the other end and the valve plate.
Abstract:
A capacity control system for a variable capacity compressor includes target suction pressure setting means for setting, based on external information input from external information detection means, a target suction pressure for controlling the pressure in a suction pressure region as a control target, suction pressure estimation means for estimating, based on the external information, a pressure that is estimated to prevail in the suction pressure region if the variable capacity compressor is operated with a maximum discharge capacity, and discharge capacity determination means for determining, based on the suction pressure estimated by the suction pressure estimation means and the target suction pressure set by the target suction pressure setting means, whether the variable capacity compressor is operating with the maximum discharge capacity or with a controlled discharge capacity.
Abstract:
Disclosed is a variable displacement compressor provided with a displacement control valve capable of easily adjusting an optimum level the sensitivity to a rise in the pressure in a crank chamber. The variable displacement compressor is configured in such a manner that the stroke of a piston is adjusted by changing the pressure in the crank chamber, the pressure in the crank chamber being changed by adjusting the degree of opening of the displacement control valve for opening and closing a path for communicating between a discharge chamber and the crank chamber, wherein the displacement control valve is provided with a valve chamber communicating with the discharge chamber, a valve hole, a valve element for opening and closing the valve hole, a pressure sensing chamber communicating with a suction chamber, a pressure sensing member disposed in the pressure sensing chamber, and a pressure sensing rod having one end connected to the pressure sensing member and the other end connected to the valve element and driving the valve element in response to displacement of the pressure sensing member. The pressure in the crank chamber acts on the valve element from the valve hole side in the direction of opening of the valve element, and acts on the pressure sensing rod from the valve hole side in the direction of closing of the valve element. That area (Sr) of the pressure sensing rod which receives the pressure in the crank chamber is set to be greater than that area (Sv) of the valve element which receives the pressure in the crank chamber.
Abstract:
A variable displacement compressor capable of controlling a piston stroke by openably controlling a displacement control valve to regulate a pressure in a crank chamber, comprising the displacement control valve disposed in a passageway from a discharge chamber to the crank chamber, and a fixed orifice provided in a passageway from the crank chamber to a suction chamber, the displacement control valve further comprising a pressure sensing member for the pressure in the suction chamber or the crank chamber, a valve element having a valve part opened and closed in response to the operation of the pressure sensing member, a valve chamber for disposing the valve part therein and allowing the pressure in the crank chamber to act therein, a partition wall disposed around the valve element, a pressure chamber partitioned from the valve chamber by the partition wall and allowing the pressure in the suction chamber to act therein, and a solenoid provided to the other end of the valve element, wherein a flow passage of non-contact structure is formed in the partition wall, and the number of sliding parts is reduced to lower a sliding resistance.
Abstract:
A displacement control valve of a variable displacement swash plate compressor comprises a valve body provided with a valve shaft, a driver for applying driving force to the valve body, a tube-shaped valve chest accommodating the valve body to be capable of reciprocal movement and provided with a valve shaft inserting hole through which the valve shaft of the valve body is passed slidably at one end wall, an inlet hole at a circumferential wall and a valve hole which is opened and closed by the valve body at the other end. The inlet hole communicates with an outlet chamber of the compressor and the valve hole communicates with a crank chamber of the compressor. The inlet hole is directed at right angle to and disposed offset in the radial direction from the central axis of the valve chest.
Abstract:
A variable fluid displacement apparatus includes a plate which is located in a crank chamber and is tiltably connected to a drive shaft so as to vary the variable slant angle responsive to a pressure differential between the crank chamber and a suction chamber. A first communication path communicates the crank chamber with a discharge chamber to control pressure within the crank chamber. A first valve device opens and closes a first opening area in the first communication path to adjust the pressure level. A second valve device closes a second communication path, which communicates the crank chamber with the suction chamber. A second opening area in the second communication path is closed when a pressure difference between the crank chamber and the suction chamber falls below a predetermined value. Thus, a variable displacement compressor obtains a desired compression capacity after the variable displacement compressor commences operation.
Abstract:
A variable displacement compressor controls a discharge displacement by changing an inclination of a swash plate (5) depending on a pressure differential between a crank chamber (3) and a suction chamber (13) thereby to change a piston stroke. A first communication passage (18) establishes communication between a discharge chamber (14) and the crank chamber. A pressure control valve (19) opens and closes the first communication passage. On the other hand, a second communication passage (20) establishes communication between the crank chamber and the suction chamber. A valve member (21) is disposed in the second communication passage and fully closes the second communication passage due to a biasing force of a spring when a pressure differential between the discharge chamber and the suction chamber becomes not greater than a given value.
Abstract:
A slant plate type compressor with a capacity or displacement adjusting mechanism is disclosed. The compressor includes a housing having a cylinder block provided with a plurality of cylinders and a crank chamber. A piston is slidably fitted within each of the cylinders and is reciprocated by a drive mechanism which includes a member having a surface with an adjustable incline angle. The incline angle is controlled by the relative pressure between the crank and suction chambers. The relative pressure is controlled by a control mechanism which comprises a passageway communicating between the crank chamber and a suction chamber, a first valve device to control the closing and opening of the passageway and a second valve device to control the pressure in an actuating chamber. The first valve device includes a bellows and a valve shifting element coupled to the bellows. The valve shifting element includes a first surface which receives pressure in the actuating chamber and a second surface which receives discharge pressure in order to apply a force to the bellows at another and thereby shift the response pressure of the bellows in response to changes in the actuating chamber pressure and changes in the discharge pressure.
Abstract:
An automobile air conditioner system including a refrigerant circuit having a condenser, expansion element, evaporator and wobble plate type compressor with a variable displacement mechanism. Two passages communicate between the crank chamber and the suction chamber in the cylinder block. A bellows is disposed in a first passage and controls the communication between the crank chamber and the suction chamber response to crank chamber pressure. A control valve is disposed in the second passage and controls communication between the crank chamber and the suction chamber in the second passage in response to a signal representing the temperature of the air immediately leaving from the evaporator. An electric clutch is mounted on the compressor in order to intermittently transmit the rotational motion of an automobile engine to the drive shaft of the compressor in response to the signal. The automobile air conditioning system is provided with a demist switch for preventing the reduction of visibility through the windshield of the automobile. The operation of the control valve overrides the operation of the bellows without regard to the temperature signal when the demist switch is turned on.
Abstract:
An improved variable displacement mechanism for a slant plate type compressor, such as a wobble plate type compressor, which increases the cooling efficiency of the compressor is disclosed. The variable displacement mechanism includes a passageway to allow communication between the suction chamber and the crank chamber, and a valve control mechanism for controlling the opening and closing of the passageway. The valve control mechanism includes a first valve control device with a first valve element which opens and closes a hole linking the suction chamber and the crank chamber. The first valve control device acts in accordance with the pressure within its interior space. The valve control mechanism also includes a second valve control device which controls the interior pressure of the first valve control device. The second valve control device is responsive to the actual operating conditions of the compressor. In one embodiment, the second valve control device includes a coil spring made of a shaped memory alloy which expands and contracts in accordance with the temperature within the second valve control device.