2049 results about "Electronic expansion valve" patented technology

The invention provides an intelligent adjusting and dynamic defrosting method and system based on multiple sensors and a medium The method comprises the steps that firstly, monitoring data are obtained in real time according to the multi-dimensional sensors deployed in a freezer, and a multi-source data matrix is obtained through preset data processing and integration; secondly, dynamically adjusting a frost condition model weight coefficient according to monitoring data, and quantifying a frost condition coefficient based on a frost condition model in combination with a multi-source data matrix; then, executing a three-stage defrosting strategy according to the frost condition coefficient, and respectively adjusting working parameters of defrosting equipment such as a compressor, a condensation fan or a heater; and finally, precise control over the box temperature is achieved through power step soft start of a compressor and PID dynamic adjustment of an electronic expansion valve, and energy efficiency optimization is achieved by automatically optimizing the rotating speed of a condensation fan based on the environment temperature and humidity. The corresponding defrosting operation is triggered through the frost condition coefficient, and the effectiveness of defrosting and the stability of the box temperature are improved; in addition, the adaptability of special scenes is enhanced by dynamically adjusting the weight.

The invention relates to the technical field of automatic control, in particular to an efficient magnetic suspension water chilling unit control system which comprises a refrigerant flow monitoring module, a dynamic flow adjusting module, a start-stop delay judging module, a temperature gradient sensing module and a frequency self-adaptive adjusting module. According to the method, the temperature difference curve is established through real-time monitoring data, the refrigerant flow synchronism is analyzed, temperature difference abnormity can be accurately recognized, the refrigerant adjusting requirement is extracted, traditional threshold value judgment lag is avoided, the refrigerant flow is controlled in real time, fluctuation impact is buffered, and the adjusting precision is improved by dynamically adjusting the opening degree of the electronic expansion valve and the rotating speed of the circulating pump; the method has the advantages that starting and stopping conditions are accurately judged, misoperation is reduced, early positioning of thermal imbalance is achieved through temperature difference sensing of an evaporator, a compression cavity and a condenser and establishment of an internal temperature difference distribution diagram, energy efficiency reduction is avoided, the frequency of a frequency converter is adjusted according to temperature difference distribution, the optimal load is matched, frequency adaptivity and system load response are improved, and refrigeration cycle energy efficiency is optimized.

The invention discloses a new energy vehicle heat management method, device and equipment and a storage medium, and relates to the technical field of new energy vehicle heat management.The new energy vehicle heat management method includes the steps that the vehicle running state, the compressor working state, an air conditioner enabling signal and the battery temperature are obtained; determining a target thermal management mode according to at least one of the vehicle running state, the compressor working state, the air conditioner enabling signal and the battery temperature; operation parameters of a target control assembly are obtained according to the target heat management mode, wherein the target control assembly comprises a compressor, a refrigerant electromagnetic valve, an electronic expansion valve, a fan, a water pump and a PTC heater; thermal management is conducted on a vehicle battery and / or a cab on the basis of the operation parameters, the operation parameters comprise at least one of the rotating speed of a compressor, the state of a refrigerant electromagnetic valve, the opening degree of an electronic expansion valve, the rotating speed of a fan, the state of a water pump and the power of a PTC heater, and the charging efficiency and the system energy efficiency in the low-temperature and high-temperature environments are improved.

The invention provides a solar energy-air energy composite heat pump system based on self-contained energy storage cascade application and a control method. The solar energy-air energy composite heat pump system comprises a heat pump host module, a solar module and a hydraulic module. Hot water generated by the solar heat collector is accumulated in the energy storage water tank and serves as an external heat source for active enhanced vapor injection to improve the performance of the heat pump. An active enhanced vapor injection device is designed for a heat pump host module, a refrigerant in an economizer absorbs heat of heat storage hot water, is jetted to a middle pressure cavity of a compressor and is converted into heating capacity, and the performance of the heat pump is greatly improved. When it is detected that the temperature in the heat storage water tank is reduced to a certain temperature, the flow direction of the heat storage hot water is switched through the switching assembly, the heat storage hot water is pumped to the heat pump fluorine-water heat exchanger for heat exchange, the heat pump performance is improved, and cascade application of the heat storage hot water is achieved. Refrigerant flows in the fin type heat exchanger and the fluorine-water heat exchanger are controlled by respective electronic expansion valves, and the opening degrees of the fin type heat exchanger and the fluorine-water heat exchanger are adjusted according to respective air suction superheat degrees, so that respective optimal heat exchange effects are realized.

The invention relates to the technical field of refrigeration, in particular to an anti-icing refrigeration method and system.The anti-icing refrigeration method comprises the steps that water temperature data in a water tank are collected in real time, and temperature dynamic parameters reflecting the temperature change trend and stability are calculated; dynamically adjusting the opening degree of the electronic expansion valve based on the temperature dynamic parameter; when the temperature dynamic parameter meets a preset icing triggering condition, deicing circulation is executed; a compressor and an electronic expansion valve are closed, and a circulating pump is started; monitoring the temperature dynamic parameter in real time in the deicing cycle, dynamically adjusting the duration of the deicing cycle based on the temperature dynamic parameter, judging whether a preset deicing completion condition is met or not based on the temperature dynamic parameter, if not, continuing the deicing cycle, and if yes, terminating the deicing cycle. And the compressor and the electronic expansion valve are restarted to recover the refrigeration cycle. The technical problems that in the prior art, due to freezing, energy consumption of a refrigerating system is too high, and the automation degree is insufficient are solved.

The present invention discloses an electronic expansion valve with a buffering effect, which includes a stator assembly and a valve seat assembly. The valve seat assembly is installed at the lower part of the stator assembly. The valve seat assembly includes an end cover assembly, a magnetic isolation tube, a valve needle assembly and a valve seat assembly. A lead screw assembly is arranged inside the magnetic isolation tube. The valve needle assembly includes a valve needle and a valve needle spring arranged in the inner hole at the lower end of the valve needle. The lower end of the valve needle is inserted with a valve needle head. A balance flow channel is opened in the middle of the valve needle head. A bushing is sleeved on the outer side of the upper part of the valve needle head. One end of the bushing abuts against the valve needle spring. A valve needle sleeve is arranged at the lower end of the bushing. A valve needle internal leakage O-ring is installed between the inner side of the valve needle sleeve and the valve needle head. The lead screw in the lead screw assembly axially inserts into the central threaded through hole of the valve needle. The present invention has a balance pressure function, a long service life, and a buffering effect when closing the valve, preventing the problem of thread jamming and unable to open the valve.

The invention relates to the technical field of intelligent fire extinguishing control of energy storage power stations, in particular to a method and system for plasma protection of thermal runaway of an air-cooled energy storage power station. The method comprises the following steps: processing real-time data acquired by a multi-source sensor through a dynamic risk assessment model to obtain a risk level and an early warning level; an initial control instruction for the plasma generator and the air cooling and refrigerating system is formed according to the risk level and the early warning level; the initial control instruction is processed to form a driving control signal; a control signal is subjected to cooperative execution processing to obtain a high-energy active particle jet flow, a forced airflow and a refrigeration effect. The system comprises an air cooling box body, a battery, a fan, a plasma generator, an ejector, an intelligent controller, a compressor, a gas-liquid separator, a heat exchanger, an electronic expansion valve, a drying filter, a gas sensor and a pressure sensor valve. The safety and reliability of the energy storage power station are improved.

The invention relates to a control method and device of a heat pump system, computer equipment and a storage medium. In the starting process of the heat pump system, the first controller is used for controlling the opening degree of the electronic expansion valve based on the exhaust temperature set value and the exhaust temperature. In the starting process of the heat pump system, whether the heat pump system enters a stable operation state with system parameters reaching dynamic balance or not is judged. And in the stable operation state of the heat pump system, the second controller is used for controlling the opening degree of the electronic expansion valve based on the minimum stable superheat degree and the superheat degree. Oscillation of the superheat degree of the evaporator can be effectively restrained through control over the starting process, the adjusting time is shortened, and the operation stability of the heat pump system is improved. The control in the stable operation stage can enable the superheat degree of the evaporator of the heat pump system to be close to the minimum stable superheat degree, more refrigerants can participate in phase change heat absorption, the heating capacity of the refrigerants is improved, the power consumption of a compressor is reduced, and the energy efficiency ratio of the heat pump system is increased.

The invention discloses a heat pump water heater low-temperature freezing oil return control method and system based on dynamic operation parameter adjustment, and the method comprises the following steps: monitoring the evaporator outlet refrigerant temperature, the compressor air return port temperature and the environment temperature in real time through a sensor, and calculating the temperature difference as a core control parameter; the opening degree of an electronic expansion valve and the rotating speed of a fan are dynamically adjusted through a fuzzy control algorithm in combination with the environment temperature and the compressor running frequency, and the low-temperature oil return stability of the system is maintained; when the core temperature difference exceeds a set threshold value, an oil return compensation mode is triggered, and the circulating fluidity of lubricating oil is enhanced by improving the frequency of a compressor and adjusting the opening degree of a bypass valve of a condenser; in the oil return compensation process, closed-loop adjustment is conducted on the exhaust temperature of the compressor through a PID control algorithm, and the operation safety of the system is ensured. The operating parameters are dynamically adjusted, the parameters such as the environment temperature and the system load are monitored in real time, and the control parameters are dynamically adjusted according to the parameters, so that the oil return requirements under different working conditions are met.

The invention discloses a multi-temperature-zone collaborative refrigeration system and an energy-saving control method for a variable-temperature refrigeration house, and belongs to the technical field of refrigeration house temperature control, and the method comprises the steps of calling a dynamic load prediction model based on an obtained initial real-time monitoring data set, and calculating thermal load change trend data of each temperature zone in a preset time period; the electronic expansion valve is adjusted and a start-up control instruction is generated by combining the thermal load trend and the cargo temperature and humidity requirements, and the refrigerating unit is started, stopped or switched to operate the system; during system operation, the central oil way management module is started, and the oil level of a compressor is monitored and compared with a preset safety threshold value to generate an oil way adjusting instruction; starting an intelligent oil pump to convey oil according to the instruction, and performing closed-loop control on an electronic expansion valve by taking the superheat degree or the pressure value of an evaporator outlet as a feedback signal; summarizing data of the execution mechanism and the sensor and feeding back to the central controller to form a closed loop; according to the invention, multi-temperature-zone coordinated regulation and control are realized, the refrigeration efficiency and the equipment safety are improved, and the energy consumption is reduced.

The utility model provides an electronic expansion valve which comprises a first connecting pipe, a silencing part, a valve seat part and an adapting part, the valve seat part and the adapting part are connected with each other, the adapting part is respectively connected with the valve seat part and the first connecting pipe, the adapting part is provided with a containing cavity, and the silencing part is installed in the containing cavity in a limited mode. By the adoption of the scheme, the furnace welding object of the first connecting pipe is converted from the valve seat part to the switching part through the switching part, when the switching part and the first connecting pipe are subjected to furnace welding, the silencing part located in the containing cavity is separated from the first connecting pipe through the switching part, the first connecting pipe does not directly abut against the silencing part, welding flux generated during furnace welding cannot permeate into the silencing part, and the silencing effect is good. And the noise reduction effect of the noise reduction part and the flow capacity of the electronic expansion valve are ensured. And on the other hand, independent off-line installation of the switching part and the silencing part can be achieved, the production takt is reduced, part standardization is improved, the falling risk in the part turnover process is avoided, and the machining and installation efficiency of the electronic expansion valve is improved.

The invention provides a low-temperature heat pump liquid impact prevention and supercooling degree strengthening control method based on dual-mode self-adaptive regulation and control, which comprises the following steps: monitoring the bottom temperature of a gas-liquid separator and the change rate of the temperature, and controlling the supercooling degree of the gas-liquid separator on the basis of the difference value between the temperature and a preset safety critical temperature and the difference value between the change rate and a preset minimum temperature rise rate, constructing a liquid impact risk index; based on the liquid impact risk index, the pulse power excitation intensity is calculated, the number of opened spraying channels is selected according to the pulse power excitation intensity, the pulse duty ratio of each channel is adjusted, the high-temperature gas-state refrigerant is controlled to be injected into the bottom of the gas-liquid separator, and the liquid-state refrigerant is driven to evaporate; generating a mode switching score, and generating a mode switching signal when the mode switching score exceeds a mode switching threshold value and the temperature of the gas-liquid separator reaches a safety lower limit; and according to the mode switching signal, a supercooling degree strengthening mode is switched, and the opening degree of an economizer branch electronic expansion valve is adjusted according to the deviation between the current supercooling degree and the target supercooling degree.

The utility model provides a valve seat structure and an electronic expansion valve, the valve seat structure comprises a valve seat part and a switching part, the switching part and the valve seat part are respectively used for switching a first connecting pipe and a second connecting pipe, the valve seat part is provided with a limiting cavity, and an opening of the limiting cavity is located on the bottom wall of the valve seat part; at least part of the switching part is arranged in the limiting cavity in a penetrating mode, and the switching part and the valve seat part form an annular welding seam at the opening of the limiting cavity. According to the technical scheme, furnace welding switching of the first connecting pipe is achieved through the switching part, the welding position of the switching part and the valve seat part is limited to the bottom of the valve seat part, and the situation that when the welding position is located on the side of the valve seat part, laser welding and other welding are prone to being interfered by the second connecting pipe, and therefore welding is not facilitated is avoided; welding of operators and realizability of corresponding welding equipment are facilitated, and convenience and reliability of welding are improved.

The invention is suitable for the technical field of electric vehicle thermal management, and provides an electric vehicle thermal management system based on a refrigerant four-way valve, which comprises a refrigerant loop and a cooling liquid loop. The refrigerant loop comprises a refrigerant four-way valve, an electric compressor, a first plate heat exchanger, an electronic expansion valve, a second plate heat exchanger and a gas-liquid separator; the cooling liquid loop comprises a first plate heat exchanger, a second plate heat exchanger, a first water pump, a second water pump, a power battery water pump, a proportional three-way valve, an air blower, a third heat exchanger, an air PTC, an electric driver, a low-temperature radiator and an expansion kettle. According to the system, a single refrigerant four-way valve is introduced to transform a refrigerant loop of a conventional indirect heat pump technology, and a single proportional three-way valve and a cooling liquid loop are superposed to carry out innovative fusion design; the cooling liquid loop is greatly simplified compared with a conventional electric vehicle thermal management system framework, and meanwhile the performance requirement of the electric vehicle thermal management system is met.

The invention relates to the technical field of new energy automobile heat management, and belongs to an indirect heat pump heat management system for a new energy automobile. Battery outlet water and warm core outlet water are converged and then shunted through a waterway integration mode of a five-way valve and a proportional three-way valve, and the flow is distributed through the proportional three-way valve; the mixed water enters the battery to control the water inlet temperature of the battery, so that a water-water heat exchanger can be saved, and the effects of reducing cost and improving efficiency are achieved; on the aspect of the agent side, a large-diameter electronic expansion valve is arranged at an outlet of the water-cooling condenser, the internal flow and state of the water-cooling condenser are actively controlled by adjusting the opening degree of the large-diameter electronic expansion valve, the supercooling degree can be increased, the superheat degree can be restrained, the heat exchange capacity and the accurate control capacity can be enhanced, and heating and dehumidification outlet air temperature control in spring and autumn can be better achieved.

The invention relates to the technical field of automobile heat management, in particular to a multi-loop integrated heat management system and method for an electric automobile. Comprising a first electronic water pump, a second electronic water pump, a refrigerating device, a first temperature sensor, a second temperature sensor, a pressure sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a first pressure temperature sensor, a second pressure temperature sensor, a first electronic expansion valve, a second electronic expansion valve, an evaporator, a fan and a compressor. According to the system, on the basis of an existing whole vehicle air conditioning system, an air-cooled condenser is replaced with the water-cooled condenser, a three-way valve, an integrated battery, the motor, the controller of the motor and a passenger compartment heat management system are removed, the motor is comprehensively utilized for preheating, the energy utilization rate is increased, and the energy consumption is reduced. The endurance mileage of the whole vehicle is improved, and the complexity of the system is reduced.

The utility model relates to the field of cold and heat pump units, in particular to a multifunctional efficient defrosting evaporation cold and heat pump unit which comprises a compressor, and an outlet of the compressor is respectively connected with an inlet of a shell and tube heat exchanger and an inlet of an evaporation cold heat exchanger through a four-way reversing valve. An outlet of the evaporation cold heat exchanger is connected with an inlet of the compressor and an outlet of the shell-tube heat exchanger through electronic expansion valves. An outlet of the shell-tube heat exchanger is connected with an inlet of the compressor and the fin type heat exchanger set through the electronic expansion valve. The fin type heat exchanger set comprises at least two sets of heat exchange channels which are mutually independent, each heat exchange channel is formed by connecting a three-way valve, a fin type heat exchanger and a one-way valve in series, and the three-way valve is connected with an inlet and an outlet of the compressor. The utility model provides a multifunctional efficient defrosting evaporation cold and heat pump unit, which can realize three functions of efficient refrigeration, heating and continuous defrosting while heating.

The utility model provides an electronic expansion valve which comprises a valve seat structure and a noise reduction part, the valve seat structure is provided with a containing cavity, the containing cavity comprises a plurality of limiting cavity sections which are sequentially communicated in the installation direction of the noise reduction part, and the inner diameters of the limiting cavity sections are in a decreasing trend in the installation direction of the noise reduction part. The silencing part comprises a plurality of silencing blocks with different outer diameters, and any silencing block is correspondingly installed in a limiting cavity section with the inner diameter matched with the outer diameter of the silencing block in a limiting mode. According to the technical scheme provided by the utility model, the corresponding installation of a plurality of silencing blocks with different outer diameters is realized through the multi-section reducing division of the accommodating cavity, the condition of wrong installation sequence caused by the confusion of the plurality of silencing blocks can be avoided, and the improvement of the installation efficiency of the silencing part is facilitated.

The invention discloses a superheat degree control method and system for suppressing superheat degree oscillation. The method comprises the steps that the process identification module identifies dynamic characteristics of the superheat degree control system through a transfer function; the prediction control module constructs a state space model according to the dynamic characteristics, performs state prediction based on a state estimation value and a disturbance estimation value, outputs a state prediction vector and calculates a first objective function; the parameter identification self-tuning module carries out self-tuning on the PID control parameters according to the dynamic characteristics and a second objective function; the PID control module outputs an electronic expansion valve driving signal according to the deviation between a superheat degree predicted value in the state prediction vector and a superheat degree preset target value and the set PID control parameter; and the electronic expansion valve driver drives the electronic expansion valve to act according to the electronic expansion valve driving signal so as to adjust the flow of the refrigerant. According to the technical scheme provided by the embodiment of the invention, superheat degree oscillation caused by low superheat degree operation of the refrigerating system is remarkably inhibited, and the system stability is improved.

A method, apparatus and device for controlling a vehicle heating system, and a vehicle and a storage medium. The method comprises: acquiring, in real time, an ambient temperature, passenger-compartment data, pre-valve pressure of a first electronic expansion valve (33) and suction pressure of a second electronic expansion valve (36); starting a heat pump (31), an internal heat exchanger (32), an external heat exchanger (34) and an electromagnetic switch (35), opening the first electronic expansion valve (33) according to a first initial opening degree, and opening the second electronic expansion valve (36) according to a second initial opening degree; performing automatic control on the first electronic expansion valve (33) on the basis of the pre-valve pressure and preset target pre-valve pressure, such that the opening degree of the first electronic expansion valve (33) automatically changes, according to a first preset correspondence, as the pre-valve pressure changes; and performing automatic control on the second electronic expansion valve (36) on the basis of the suction pressure and preset target suction pressure, such that the opening degree of the second electronic expansion valve (36) automatically changes, according to a second preset correspondence, as the suction pressure changes. Therefore, the vehicle costs of a vehicle can be reduced.

The invention discloses a water chilling unit operating under extreme working conditions, which comprises a fan and a finned condenser at the upper part and a refrigerating unit at the lower part, and the refrigerating unit is provided with a refrigerant circulating system and a chilled water circulating system; the refrigerant circulating system comprises a compressor, a finned condenser, an electronic expansion valve and a shell and tube evaporator which are connected in sequence; the chilled water circulation system comprises a water pipe, a water pump and an evaporator which are connected in sequence; the electronic expansion valve is connected with the drying filter cartridge and the shell and tube evaporator, the drying filter cartridge is connected with the liquid storage tank, and the shell and tube evaporator is connected with the gas-liquid separator. According to the invention, PWM and stepless regulation multi-dimensional cooperative control are used, so that stable operation is realized when the energy efficiency in a wide temperature range is suddenly reduced; on the high-temperature side, the condensation fan adopts a stepless speed regulation technology; and the low-temperature side is switched into a PWM period adjusting mode.

The invention relates to the technical field of heat pump air conditioning systems, and discloses an enthalpy increasing control method for a heat pump system, which comprises the following steps: under the condition of operating in an enthalpy increasing mode, acquiring a first target exhaust temperature and a suction superheat degree of a compressor and an economizer inlet and outlet state; under the condition that the inlet and outlet state of the economizer meets the enthalpy increasing onset condition, the opening degree of a main electronic expansion valve is adjusted according to the suction gas superheat degree so that the suction gas superheat degree can be within the suction gas superheat degree range; and the opening degree of the auxiliary electronic expansion valve is adjusted according to the first predicted exhaust temperature and the first target exhaust temperature so that the first predicted exhaust temperature can reach the first target exhaust temperature. The method can maximize the heating capacity of the heat pump system and ensure the operation stability of the heat pump system. The invention further discloses an enthalpy increasing control device for the heat pump system and the heat pump system.

The invention relates to the technical field of new energy automobile heat management, and discloses a battery inlet water temperature-based dual-threshold decision-making method, which is realized through the following components: an intelligent collaborative decision-making center module, a multi-source data sensing acquisition module, a waste heat recovery and efficient heat exchange module, a precise execution driving module and a multi-level safety guarantee module. The intelligent collaborative decision center module comprises a heat management controller and an AI intelligent control unit; the multi-source data sensing and collecting module comprises a battery management system, a whole vehicle controller, an air conditioner controller and a full-dimension parameter monitoring sub-module. The waste heat recovery and efficient heat exchange module comprises a double-effect Chiller, an electronic expansion valve, a three-way valve and a four-way valve; the invention aims to solve the problems that energy consumption is increased and efficient circulation of energy cannot be realized due to the fact that waste heat generated in the operation process of components such as a motor cannot be fully excavated and reused and temperature control requirements are met by depending on additional heating or refrigerating components in the heat management of the existing new energy automobile.

The utility model discloses a liquid return impact experiment device for a low-pressure cavity scroll compressor, and relates to the technical field of experiment equipment, in particular to the liquid return impact experiment device for the low-pressure cavity scroll compressor. One end of a first stop valve is connected with an exhaust pipeline of a tested compressor, and the other end of the first stop valve is connected with an inlet of a gas-liquid separator; an outlet of the gas-liquid separator is connected with a second stop valve; the second stop valve is connected with the electronic expansion valve through an electronic expansion valve pipeline; the electronic expansion valve pipeline is connected with a bypass pipeline in parallel, and a third stop valve is arranged on the bypass pipeline; an outlet of the electronic expansion valve is connected with a fourth stop valve; the fourth stop valve is connected with the liquid sight glass; and the liquid sight glass is connected with an air suction pipeline of the tested compressor. According to the technical scheme, the problems that an existing compressor glow test device in the prior art is complex, whether liquid returns or not is not easily judged, the experimental period is long, and the overall liquid impact resistance of the compressor cannot be rapidly and accurately evaluated are solved.

The invention relates to the technical field of air conditioning equipment, in particular to an air conditioning equipment control method and air conditioning equipment, and aims to solve the technical problems that an existing air conditioning equipment control method is poor in expansion valve control precision and cannot effectively adapt to different operation working conditions of the air conditioning equipment, so that the air conditioning equipment is shut down abnormally, and noise is increased. Therefore, the air conditioning equipment comprises a compressor, an outdoor heat exchanger, an electronic expansion valve and an indoor heat exchanger which are sequentially connected in series, and the control method comprises the steps that after the air conditioning equipment is started, the outdoor temperature is obtained; according to the outdoor temperature, the initial opening degree of the corresponding electronic expansion valve is obtained; and the opening degree of the electronic expansion valve is adjusted to the initial opening degree. Through the arrangement, the initial opening degree and the subsequent adjustment amount of the expansion valve can be corrected according to the outdoor temperature so as to adapt to different limiting working conditions of the air conditioning equipment, the control precision and speed of the expansion valve are improved, abnormal shutdown of the air conditioning equipment is prevented, and the operation noise of the air conditioning equipment is reduced.

The invention relates to the technical field of air conditioners, in particular to a low-temperature refrigeration control method, a storage medium, electronic equipment and an energy storage air conditioner. The energy storage air conditioner aims at solving the problem that an existing energy storage air conditioner is difficult to normally refrigerate and operate in a low-temperature state. In order to achieve the purpose, the low-temperature refrigeration control method comprises the steps that the environment temperature is obtained; the initial opening degree of the electronic expansion valve is determined based on the environment temperature; the electronic expansion valve is controlled to be opened to the initial opening degree; the compressor is controlled to be started while, before or after the electronic expansion valve is controlled to be started; obtaining a target superheat degree; the target opening degree of the electronic expansion valve is determined based on the target superheat degree; and the electronic expansion valve is controlled to be adjusted to the target opening degree. By the adoption of the technical scheme, when the air conditioner conducts refrigeration in the low-temperature environment, a small amount of refrigerant can enter the system firstly, then the system can reach the target superheat degree by adjusting the opening degree of the electronic expansion valve, normal gasification of the refrigerant is guaranteed, and therefore it is guaranteed that the air conditioner is started smoothly.

The invention provides a refrigerating system, a control method and device thereof, equipment and a storage medium, belongs to the technical field of refrigerating control, and solves the problems that operation parameters of the refrigerating system cannot be accurately controlled and energy consumption is high. The control method comprises the steps that the mass of articles stored in a compartment of the refrigeration equipment, the temperature in the compartment and the temperature of the environment where the refrigeration equipment is located currently are obtained; the optimal operation frequency of a compressor is determined according to the article mass and the temperature in the compartment; and the optimal opening degree of the electronic expansion valve is determined according to the optimal operation frequency and the environment temperature, so that the operation parameters of the refrigeration system can be more accurately controlled, and the energy consumption is reduced.

The utility model relates to the technical field of expansion valves, in particular to an electronic expansion valve and an air conditioning system. The electronic expansion valve comprises a valve body assembly, a screw unit and a valve element assembly, the valve body assembly is sequentially provided with an assembly hole and a valve port in the axial direction, one end of the screw unit extends into the assembly hole and is connected with the valve element assembly, and the valve element assembly can be driven by the screw unit to move in the direction close to or away from the valve port. The electronic expansion valve has a full-closing state and a valve pre-opening state, and in the full-closing state and the valve pre-opening state, a first preset gap is formed between the valve element assembly and the valve port. According to the electronic expansion valve and the air conditioning system, the problem that an existing electronic expansion valve is poor in flow consistency due to the fact that a fixed pulse technology is adopted is solved.

The invention provides a heat pump non-stop defrosting control method and system based on double-evaporator cooperative control, and the method comprises the steps: building a temperature difference response change rate index by collecting the refrigerant inlet and outlet temperatures of two groups of fin heat exchangers in real time, and recognizing a side needing to be defrosted and a heating side; an electronic expansion valve, a fan and an electromagnetic valve are dynamically configured, so that the side needing to be defrosted enters a static defrosting mode, and the heating side continuously supplies heat; the frequency rising of the compressor and the switching of the four-way valve are cooperatively adjusted, and small-flow pre-balancing is executed before reversing so as to restrain pressure impact; and after defrosting is completed, it is judged that defrosting is finished based on the thermal response state and the heat change trend, the side needing defrosting is controlled to be reset, and heating is started again. Uninterrupted heat supply of the user side in the defrosting process is achieved, water temperature fluctuation and energy consumption are remarkably reduced, and the operation stability and energy efficiency of the heat pump in the low-temperature and high-humidity environment are improved.

The invention discloses a heat pump heat storage defrosting control method which comprises the following steps: outdoor temperature acquisition: after starting to heat, performing data acquisition on the surface temperature of an outdoor heat exchanger at regular time; temperature deviation is calculated, specifically, temperature data sampled each time are set to be Tn, the temperature difference Tn = Tn-T0 during sampling each time is calculated, and the sampling frequency is t / time; calculating a temperature change rate: calculating a real-time temperature change rate according to the acquisition evaluation rate; frosting degree judgment, wherein the frosting degree is divided into mild frosting, moderate frosting or severe frosting according to the temperature difference and the temperature change rate; and according to the frosting degree, different strategies are adopted to adjust the opening degree of the main electronic expansion valve and the auxiliary electronic expansion valve, and a refrigerant is called to enter the outdoor heat exchanger for defrosting. The frosting degree is subdivided, and the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve are adjusted through different strategies, so that the situation that the indoor temperature is greatly reduced during mild frosting or moderate frosting is avoided.