17 results about "Electronic expansion valve" patented technology

The invention discloses a method, system and device of air injection of an air conditioning system and an air conditioner. The method comprises the following steps that the discharge temperature of a compressor and an adjusting parameter of an electronic expansion valve are obtained, and opening of the electronic expansion valve is adjusted according to the discharge temperature of the compressor and the adjusting parameter of the electronic expansion valve. The technical problem that in the prior art, the stability of air injection control and adjustment is low is solved.

The invention discloses a freezing device. When the opening of the electronic expansion valve (14) is less than the specified opening, or the superheat of the evaporator (15) is greater than the specified superheat, it is judged that the refrigerant circulation is insufficient, and the evaporator fan ( 22) The air volume is reduced.

Disclosed are an air conditioning system and a method for controlling an operation thereof, whereby a charging device for charging power to be supplied into the indoor unit is employed, a chargeable control unit is separately employed, or a separate control unit connectable between the indoor unit and an electronic expansion valve is employed, thereby closing the electronic expansion valve even if power supplied into the indoor unit is blocked while controlling opening and closing of the electronic expansion valve, and additionally preventing the electronic expansion valve from being left open, resulting in prevention of an overload of a compressor within an indoor unit.

The invention relates to a defrosting control method based on the opening degree of an electronic expansion valve. The method comprises the steps that the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition or the proportional relation between the reduction value and the opening degree of the electronic expansion valve under the non-frosting normal operation condition is taken as the condition for judging a defrosting starting action; when the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition reaches or exceeds the set difference value K, or the proportion between the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition and the opening degree of the electronic expansion valve under the non-frosting normal operation condition reaches or exceeds the set proportional value L, it is determined that the necessary condition or the necessary and sufficient condition of the defrosting starting action is met. The defrosting control method can more accurately and more timely judge whether an evaporator frosts or not and judge the frosting degree, so that the defrosting action is started accurately and timely, and normal and efficient operation of a heat pump system is ensured.

The invention discloses a method for preventing a valve core position of an electronic expansion valve from offsetting and a corresponding protective cover. According to the method for preventing the valve core position of the electronic expansion valve from offsetting, a protective cover capable of generating magnetism is arranged at the exterior of a valve body of the electronic expansion valve, and the valve core position of the valve body is prevented from offsetting due to vibration in the transport process by using the magnetism generated by the protective cover and an interaction force generated by a magnetic rotor in the valve body. The transport protective cover of the electronic expansion valve comprises a protective cover main body capable of generating magnetism, and the protective cover main body is provided with a hollow cavity matched with a sleeve of the electronic expansion valve. The magnetic rotor positioned in the sleeve of the electronic expansion valve and the protective cover main body positioned at the outer end of the sleeve are mutually attracted. The protective cover main body capable of generating magnetism is arranged at the exterior of the electronic expansion valve, and the magnetic piece in the protective cover main body can be mutually attracted with the magnetic rotor of the electronic expansion valve to fix the valve core during transporting; and the protective cover has the advantages of simple structure, convenience in use and capability of being reused.

The invention discloses a power supply method, a power supply device, an outer machine and an inner machine of a multi-split air conditioning system. The method comprises the following steps that thepower failure of the inner machine is detected; and a first control instruction is sent to an inner machine adjacent to the inner machine subjected to the power failure, so that the adjacent inner machine supplies power to the inner machine subjected to the power failure. According to the method, the device, the outer machine and the inner machine, the problem that the loss of a long-distance communication power supply line is too large due to the fact that the outer machine supplies the power to the inner machine during the power failure of the inner machine can be effectively solved; the problem that an electronic expansion valve cannot be controlled due to the power failure of the inner machine can be effectively solved; and meanwhile, the control cost for supplying the power to the inner machine can be effectively reduced.

The invention discloses an ultra-low ambient temperature air source heat pump unit using the daily range of the outdoor temperature of a heat storage balance chamber. The heat pump unit comprises a quasi-secondary (two-stage) compressor, an indoor heat exchanger, an economist, a main electronic expansion valve, an outdoor heat exchanger, a first auxiliary electronic expansion valve, a second auxiliary electronic expansion valve, an energy storage water tank, a first solenoid valve, a second solenoid valve, a circulating water pump, a four-way reversing valve, and a gas liquid separator. Duringthe day, at the noon with the not very low outdoor temperature, the unit has excess heat stored in the energy storage water tank, when the outdoor temperature is very low at night, the unit uses thestorage heat to heat and gasify the compressor for gas supplement, the heat absorbed from the outside absorption of the unit is equivalent to the sum of the heat absorbed from the environment of the outdoor heat exchanger and the heat absorbed from the heat storage water of the gas supplement, when the operating state of the compressor is unchanged, the unit heat can be increased by 32% or higher,and the heat requirements in the ultra-low temperature environment of the unit are met, so that the daily range of the outdoor temperature is balanced.

The invention belongs to the technical field of air conditioners, and particularly relates to a self-cleaning control method for an air conditioner. According to the technical scheme, the air conditioner comprises a pulse vibration device arranged on an indoor heat exchanger, the indoor heat exchanger, an outdoor heat exchanger, a compressor, an electronic expansion valve and a four-way valve, wherein the indoor heat exchanger, the outdoor heat exchanger, the compressor, the electronic expansion valve and the four-way valve can form a closed-loop refrigerant circulation system. The self-cleaning control method comprises the following steps of closing the electronic expansion valve firstly under the refrigeration working condition, and then closing an electromagnetic valve on the low-pressure side of the compressor after a preset time; starting the pulse vibration device to crush dirt inside the indoor heat exchanger; and opening the electronic expansion valve to a preset opening degree, opening the electromagnetic valve, and upconverting the compressor so that the crushed dirt inside the indoor heat exchanger can be flushed through the refrigerant. According to the self-cleaning control method, the interior of the indoor heat exchanger can be strongly cleaned by means of a mode of vibration firstly and then flushing, so that dirt adhering to the interior of the indoor heat exchanger can be quickly and thoroughly removed, and the cleaning efficiency and the cleaning effect of the indoor heat exchanger are ensured.

The invention provides an R290 refrigerant heat pump air conditioner control method. The method comprises the steps of detecting whether air conditioner defrosting is finished or not; when it is detected that defrosting is finished, controlling an air conditioner system to be shut down for a first preset time; and re-starting the air conditioner system, and entering in a normal heating mode. In the low-temperature heating process, the air conditioner system is controlled to be shut down for a period of time after defrosting is finished, outdoor unit temperature of an air conditioner is balanced with an indoor unit, the refrigerant temperature in an indoor unit evaporator is not too low to generate floccules, the phenomenon that after the air conditioner enters in the heating mode, the floccules generated by low temperature form oil blockage conditions in an electronic expansion valve can be avoided, the heating efficiency of the R290 refrigerant air conditioner is improved, normal running of the air conditioner system is ensured, idling of a compressor is prevented, and the service life of the compressor is prolonged. In addition, the invention further provides an R290 refrigerantheat pump air conditioner control device and the air conditioner.