An electronic expansion valve is provided including: a valve body provided with a first port and a second port, a first cavity being defined in the valve body and being in fluid communication with the first port, the valve body also being provided with a valve port between the second port and the first cavity; a drive mechanism including a rotor having a rotor screw and a stator; a valve spindle assembly at least partially disposed in the valve body and being capable of operatively cooperating with the rotor screw for reciprocating motion to adjust the degree of opening of the valve port; and a second cavity isolated and sealed off from the first cavity, wherein a balancing passage is formed in the rotor screw and the valve spindle assembly to enable the second cavity to be in fluid communication with the second port via the balancing passage.

An electronic expansion valve is provided including: a valve body provided with a first port and a second port, a first cavity being defined in the valve body and being in fluid communication with the first port, the valve body also being provided with a valve port between the second port and the first cavity; a drive mechanism including a rotor having a rotor screw and a stator; a valve spindle assembly at least partially disposed in the valve body and being capable of operatively cooperating with the rotor screw for reciprocating motion to adjust the degree of opening of the valve port; and a second cavity isolated and sealed off from the first cavity, wherein a balancing passage is formed in the rotor screw and the valve spindle assembly to enable the second cavity to be in fluid communication with the second port via the balancing passage.

An expansion valve (1) is described to include a housing (2) having in inlet port (3) and an outlet port (4), a valve seat (5) arranged between the inlet port (3) and the outlet port (4), a valve element (6) movable over an operating stroke between a closed position at the valve seat (5) and an opened position away from the valve seat (5), and an actuator (7), wherein the actuator (7) has an electric rotary motor (8) acting on the valve element (5) by means of a threaded spindle (10) and a nut (9), wherein one of spindle (10) and nut (9) is rotatably driven by the motor (8) and the other one is rotatably fixed. Such an expansion valve should have the possibility for a simple assembly. To this end, in a disassembled condition of housing (2) and actuator (7), the actuator (7) has a mounting stroke which is at least two times the operating stroke, wherein the mounting stoke extends the operating stroke.

An expansion valve (1) is described to include a housing (2) having in inlet port (3) and an outlet port (4), a valve seat (5) arranged between the inlet port (3) and the outlet port (4), a valve element (6) movable over an operating stroke between a closed position at the valve seat (5) and an opened position away from the valve seat (5), and an actuator (7), wherein the actuator (7) has an electric rotary motor (8) acting on the valve element (5) by means of a threaded spindle (10) and a nut (9), wherein one of spindle (10) and nut (9) is rotatably driven by the motor (8) and the other one is rotatably fixed. Such an expansion valve should have the possibility for a simple assembly. To this end, in a disassembled condition of housing (2) and actuator (7), the actuator (7) has a mounting stroke which is at least two times the operating stroke, wherein the mounting stoke extends the operating stroke.

A control system and a control method, which can control an electronic expansion valve. The method comprises: acquiring a temperature signal of an electronic expansion valve outlet and a pressure signal of the electronic expansion valve outlet; determining a first current degree of superheat on the basis of the temperature signal of the electronic expansion valve outlet and the pressure signal of the electronic expansion valve outlet; and a processing unit controlling, according to the requirements of an upper computer or the requirements of a set condition, an electronic expansion value to operate one of a temperature control mode, a degree of superheat control mode and an opening control mode. The technical solution provided in the embodiments of the present invention improves the real-time performance and the accuracy of control of an electronic expansion valve.

A device for regulating a throughflow and distributing a fluid in a fluid circuit, in particular a refrigerant. The device has a housing with ports for connecting to fluid lines which are connected to at least one inner volume of the housing designed as a valve chamber via a respective through opening, and at least one valve element arranged in the valve chamber with a drive element for moving the valve element relative to the housing. The at least one valve element is mounted such that it can be displaced in a linear manner in the axial direction along a longitudinal axis such that a passage for the fluid is opened between a first port designed as an inlet and a second port designed as a first outlet and/or a third port designed as a second outlet.

A device for regulating a throughflow and distributing a fluid in a fluid circuit, in particular a refrigerant. The device has a housing with ports for connecting to fluid lines which are connected to at least one inner volume of the housing designed as a valve chamber via a respective through opening, and at least one valve element arranged in the valve chamber with a drive element for moving the valve element relative to the housing. The at least one valve element is mounted such that it can be displaced in a linear manner in the axial direction along a longitudinal axis such that a passage for the fluid is opened between a first port designed as an inlet and a second port designed as a first outlet and/or a third port designed as a second outlet.

A refrigeration cycle apparatus controller includes an expansion-valve controller configured to output an opening-degree command for an expansion valve based on a deviation between a discharge temperature of refrigerant discharged from a compressor and a set discharge temperature, and at least two control parameters including a proportionality coefficient and an integral coefficient, a flow-rate-correction-coefficient calculator configured to calculate a flow-rate correction coefficient from a refrigerant flow rate of refrigerant circulating through a refrigerant circuit and a preset flow-rate reference value, and a coefficient corrector configured to calculate the proportionality coefficient by correcting a preset proportionality-coefficient reference value based on the flow-rate correction coefficient, and calculate the integral coefficient by correcting a preset integral-coefficient reference value based on the flow-rate correction coefficient. The proportionality coefficient and the integral coefficient are calculated such that a variation range of the integral coefficient rate is larger than a variation range of the proportionality coefficient.

Provided are a control method, a control system and an electric valve. The control method includes steps described below. An actually measured setting parameter curve is acquired. A required setting parameter curve is acquired. Both the actually measured setting parameter curve and the required setting parameter curve represent a corresponding relationship between a position of the electric valve and a setting parameter. The actually measured setting parameter curve and the required setting parameter curve are fitted to acquire a position mapping curve. A setting required position is obtained according to a required setting parameter and the required setting parameter curve, and a setting actual position is acquired according to the setting required position and the position mapping curve. The electric valve is controlled to run toward the setting actual position of the electric valve.

An electronic expansion valve includes a valve component and a stator component; the valve component includes a valve body assembly, a valve core, a threaded transmission assembly and a rotor; the valve body assembly is provided with a valve port, and the valve core is driven by the threaded transmission assembly to control an opening of the valve port; a wear-resistant coating is arranged on a contact surface of at least one of components having relative movement of the electronic expansion valve, the wear-resistant coating is applied by spraying, and the wear-resistant coating has a thickness of 5 to 8 microns; and the material of the wear-resistant coating includes a molybdenum disulfide material and a polytetrafluoroethylene material.