Abstract:
A variable displacement compressor contains a displacement control valve system for controlling a displacement of fluid for compression. The displacement control valve system comprises a pressure sensing means for sensing a pressure of a suction chamber (63) or a pressure of a crank chamber (23), a transmission rod (101) supported so as to be capable of passing through a valve casing with an end thereof being in contact with this pressure sensing means, a valve body (127) for opening/closing a communication path between a discharge chamber (65) and a crank chamber (23) in correspondence to extension or contraction of the pressure sensing means while the other end of the transmission rod (101) is in contact with the valve body (127), and a solenoid (123) for applying an electromagnetic force to this valve body (127). A valve shaft (131) of the valve body (127) is supported so as to be capable of passing through a stator (111) of the solenoid (123). The valve shaft (131) is protruded into a plunger chamber (117) of the solenoid (123). The plunger chamber (117) is made to communicate with the suction chamber (63).
Abstract:
In a thermostatic expansion valve included in a refrigeration cycle for expansion of a refrigerant which is contained in the refrigeration cycle, the thermostatic expansion valve is provided with a particular chamber (14) which is substantially separated from a refrigerant passage (10, 11) for guiding the refrigerant and is connected to the refrigerant passage through an additional passage (15). The particular chamber has pressure relating to pressure in the refrigerant passage when the refrigeration cycle is operated. In order to reduce influence of the pressure in the refrigerant passage, a pressure transmission member (22) transmits the pressure in the particular chamber to a valve mechanism (200a, 201) which is placed in the refrigerant passage to adjust a flow of the refrigerant in the refrigerant passage. An operation control arrangement (205, 206, 207) controls an operation of the valve mechanism in response to temperature of the refrigerant.
Abstract:
A slant plate type compressor with a variable displacement 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 cylinder and is reciprocated by a drive mechanism including a slant plate having a surface with an adjustable inclined angle. The inclined angle is controlled by the pressure within the crank chamber to control the capacity of the compressor. The pressure in the crank chamber is further controlled by a control mechanism which includes two passageways linking the crank chamber with the suction chamber, each passageway having a valve control device to control the opening and closing of the passageway. The first valve control device controls the first passageway in response to the suction chamber pressure at a third control point. The second valve control device controls the second passageway in response to the suction chamber pressure at a first control point and at a second control point such that the passageway is open when the pressure exceeds the second control point and the passageway is closed when the suction pressure is below the first control point. The first control point is less than the third control point which is less than the second control point. The second valve control device includes a deformable plate hysterically responsive to the suction chamber pressure to switch between two shapes to control the link.
Abstract:
Provided are a capacity control valve, a variable capacity compressor, and a capacity control system, which control a discharge capacity stably even when a cooling load is small, and reduce the risk of damaging a compressor even in a state when the quantity of a refrigerant is insufficient. The capacity control valve (300) for the variable capacity compressor includes a solenoid unit (300B), a valve body (306) on which the pressure of a discharge chamber (142) of the variable capacity compressor acts in a valve opening direction, and the pressure of a suction pressure area of the variable capacity compressor and the electromagnetic force of the solenoid unit (300B) act in a valve closing direction opposite to the valve opening direction, and a pressure sensitive unit (340) on which the pressure of the discharge chamber (142) acts, and which is connected to the valve body (306) to apply urging force in the valve opening direction on the valve body (306) according to the pressure of the discharge chamber (142) when the pressure of the discharge chamber (142) is lower than a set pressure, and is separated from the valve body (306) when the pressure of the discharge chamber (142) is higher than the set pressure.
Abstract:
A variable displacement compressor comprising a displacement control valve disposed somewhere in a discharge pressure supply passageway capable of communicating with a crank chamber from a discharge chamber, and a fixed orifice disposed somewhere in a pressure relief passageway communicating with a suction chamber from the crank chamber, the displacement control valve being controlled in opening/closing operation to adjust a pressure in the crank chamber to control a piston stroke, wherein a part of the discharge pressure supply passageway and a part of the pressure relief passageway are formed as a common passageway communicating with a crank chamber end. Variable displacement control at a high reliability is possible with no foreign matter accumulation in the displacement control passageway, and the processing of a cylinder block is simplified.
Abstract:
A variable displacement compressor includes a suction chamber, a discharge chamber, and a crank chamber. The compressor also includes a first path for allowing communication between the crank chamber and the discharge chamber, and a second path for allowing communication between the crank chamber and the suction chamber. Moreover, the compressor includes a valve assembly. The valve assembly includes a valve positioned within the first path, and the valve assembly controls a pressure in the crank chamber by varying a position of the valve. The compressor also includes an orifice mechanism. The orifice mechanism includes a plate having a hole formed therethrough, and an elongated member positioned within the hole. Specifically, the elongated member is movable within the hole, and an annulus of the orifice mechanism is defined between the elongated member and an interior surface of the hole. Moreover, the annulus defines a portion of the second path, and the orifice mechanism controls a flow of a refrigerant from the crank chamber to the suction chamber by varying an area of the annulus. The compressor also includes a linking member operationally coupling the valve assembly to the orifice mechanism. For example, the linking member may operationally couple the valve assembly to the orifice mechanism, such that when the area of the opening of the annulus is at a minimum area, the valve may be open, and when the area of the opening of the annulus is at a maximum area, the valve may be closed.
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 capacity control valve is inserted in a flow path connecting a discharge chamber and a crank chamber of a variable capacity compressor and provided with a valve unit and a drive unit. The valve unit has a valve element for opening/closing the flow path or a valve passage of the valve unit. The drive unit has a movable core or plunger for driving the valve element and a communicating path that is formed in the plunger and connects chambers located in both sides of the plunger.
Abstract:
An object of the present invention is to improve an anti-abrasive property of an operating rod by using a surface hardening heat treatment without a post finishing process and to enhance a response of the operating rod by preventing powders from being attracted to a sliding surface of the operating rod. Another object is to decrease a machining cost of the operating rod. The capacitive control valve is comprised of a solenoid rod portion communicating with a moveable core of the solenoid portion, an operating rod connected with the solenoid rod portion, a valve body defined in the operating rod and opening or closing a control fluid passage hole and a fixed core oppositely arranged relative to the moveable core, the fixed core retaining a guide hole, the guide hole guiding the operating rod in freely moveable a manner which longitudinally extends through an internal bore wherein the operating rod is processed at no more than 500° C. by a low temperature surface hardening treatment.
Abstract:
In a thermostatic expansion valve having a refrigerant passage (11) for guiding a refrigerant in a predetermined direction, a seat member (209) is placed in the refrigerant passage to divide the refrigerant passage into a high-pressure chamber (10) and a low-pressure chamber (14). The seat member is movable in the predetermined direction and provided with a valve seat (200a). An urging arrangement (210) urges the seat member towards the high-pressure chamber. In the high-pressure chamber, a valve body (201) is movable for adjusting a flow of the refrigerant in cooperation with the valve seat. A control arrangement (205, 206, 207, 208) controls movement of the valve body in response to temperature of the refrigerant.