Provided is a control method for an electronic expansion valve in air conditioner comprises: obtaining a real-time running frequency of compressor, a real-time exhaust temperature and a real-time outdoor environment temperature as the compressor running; retrieving a target exhaust temperature according to the real-time running frequency in a preset relation in which each available target exhaust temperature is paired with a single real-time running frequency, wherein the target exhaust temperature retrieved being defined as a first target exhaust temperature; defining a sum of the first target exhaust temperature and a set compensation temperature as a second target exhaust temperature, wherein the set compensation temperature is determined by the real-time outdoor environment temperature ; and performing a PID control on opening amount of the electronic expansion valve based on a deviation that is a difference between the real-time exhaust temperature and the second target exhaust temperature . The method achieves an accurate and stable control on opening amount of electronic expansion valve in air conditioner.

A method of detecting electrical failure in a refrigeration system is provided. The method includes determining whether a present superheat of the refrigeration system is between a maximum superheat and a minimum superheat for the refrigeration system, the maximum superheat and the minimum superheat defining a normal operating range. The method also includes detecting an electrical property of an expansion valve assembly of the refrigeration system responsive to the superheat being outside the normal operating range. The method further includes determining whether the expansion valve assembly as experienced an electrical failure based on at least the electrical property. A signal indicating that the expansion valve has experienced an electrical failure is generated based on a determination that the expansion valve assembly has experienced the electrical failure.

Systems and methods are presented for improving stabilization of a heating, ventilating, and air conditioning (HVAC) system. More specifically, the systems and methods include a heat-flow modulator for regulating an exchange of thermal energy between a flow of refrigerant and a sensory bulb. The exchange of thermal energy allows an expansion valve to respond to a refrigerant temperature using an actuator, which is coupled to the sensory bulb. The heat-flow modulator is formed of a body that includes a first contact surface and a second contact surface. The first contact surface is thermally-coupled to a suction line of the HVAC system, which conveys the flow of refrigerant. The second contact surface is thermally-coupled to the sensory bulb. In one instance the heat-flow modulator has variable volume depending on how installed. Other systems and methods are presented. Variable heat-flow modulators are also presented.

An expansion valve according to one embodiment includes a body having a valve hole, a valve element which opens and closes a valve section by moving toward and away from the valve hole, and a shaft one end side of which connects to a drive section and the other end side of which connects to the valve element through the valve hole, the shaft transmitting the drive force, generated by the drive section, to the valve element. Here, the shaft is so provided as to run through an insertion hole formed axially with the valve hole in the body. The insertion hole is formed in the body by a cutting work, and has a support that supports the shaft and a diameter-enlarged part that is open to a downstream side of the valve hole and whose diameter is larger than that of the support.

An expansion valve device has a housing, a valve body, an actuator, a first, second, and third detectors, and a controller. The housing defines a first refrigerant path and a second refrigerant path therein. The first detector detects a temperature of the refrigerant flowing in the first refrigerant path. The second detector detects a temperature and a pressure of the refrigerant flowing on an upstream side of the valve body in the second refrigerant path. The third detector detects a temperature or a pressure of the refrigerant flowing on a downstream side of the valve body in the second refrigerant path. The controller calculates a flow rate of the refrigerant flowing in the second refrigerant path and a superheating degree of the refrigerant flowing in the first refrigerant path, and controls the opening degree of the valve body such that the superheating degree falls within a specified range.

An air-conditioning outdoor unit (1000) and an air conditioner are provided, the air-conditioning outdoor unit (1000) including: a compressor (400) having an air exhaust port (401) and an air return port (402); a six-way directional valve (100) including a valve body (1), a valve spool (2) and a pilot valve assembly (5), the valve body (1) defining a valve cavity (4) therein and being provided with a first connecting pipe (11), a second connecting pipe (12), a third connecting pipe (13), a fourth connecting pipe (14), a fifth connecting pipe (15) and a sixth connecting pipe (16), the valve spool (2) being movably disposed in the valve cavity (4), two valve chambers (3) being defined between two moving ends of the valve spool (2) and an inner circumferential wall of the valve cavity (4) so that the valve spool (2) is moved by a pressure difference between the two valve chambers (3); and an outdoor heat exchanger (500).