195 results about "Inverter compressor" patented technology

The invention provides a permanent magnet motor and a scroll inverter compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator core comprises stator teeth and a stator yoke which are uniformly distributed along the circumference, fluid through grooves are formed in the outer side of the stator yoke at the tops of the stator teeth, stator grooves are formed in two adjacent stator teeth and the stator yoke between the two stator teeth, and a plurality of strands of conductive circular enameled wires are embedded in each stator groove; the outer side of the rotor core is composed of linear segments and arcs, air grooves which are evenly distributed are formed in the rotor core, non-uniform magnetic isolation bridges are formed between the air grooves and the linear segments on the outer side of the rotor core, a certain distance is formed between every two adjacent air grooves, parallel magnetic conductive ribs are formed, and permanent magnets with the magnetic field directions changing alternately are embedded in the air grooves. A rivet hole, a lightening hole and a shaft hole are arranged close to the inner side of the rotor core. Therefore, the defined proportionality coefficient Ks is kept in a reasonable range, the power density of the motor can be increased, the cost is reduced, and the efficiency is improved.

The invention provides a rotor iron core, a permanent magnet motor and an inverter compressor, and relates to the technical field of motor and compressor design and manufacture, the rotor iron core comprises uniformly distributed permanent magnet grooves, a groove is arranged between two adjacent permanent magnet grooves, each groove extends inwards along the radial direction of the rotor iron core, parallel magnetic bridges are arranged between the grooves and the permanent magnet grooves, and the permanent magnet grooves are connected with the parallel magnetic bridges. A first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are symmetrically distributed are formed in the two sides of the top of each permanent magnet groove respectively, a first arc and a second arc are arranged on the outer side of the rotor core above the magnetic barrier grooves, the second arc intersects with the side edge of the groove, and permanent magnets with alternating magnetism are embedded in the permanent magnet grooves. The radius Rr of the outer side of the rotor iron core, the distance ho from the middle point of the bottom of the permanent magnet groove to the center point of the rotor iron core and the thickness hm of the permanent magnet meet the condition that (Rr-ho) / hm is larger than 2 and smaller than or equal to 3.4. By reasonably arranging the position and the size of the magnetic barrier groove, magnetic circuit distribution can be changed, magnetic flux leakage can be reduced, the power density of the motor can be increased, and electromagnetic vibration noise of the motor and the compressor can be reduced.

The invention provides a low-grade waste heat recovery heat pump load matching control method and system, and relates to the technical field of waste heat recovery. The method comprises the steps that boiler operation parameters are obtained; identifying the change trend of the boiler load, and predicting the change direction and amplitude of the boiler load according to the change trend; determining an expected demand quantity and a target temperature interval of the boiler for the preheated air; generating a pre-regulation frequency instruction of the heat pump inverter compressor; and according to the temperature deviation between the heat pump preheated air outlet temperature and the target temperature interval, the pre-adjusting frequency instruction is corrected, a final frequency instruction is obtained, and a heat pump inverter compressor is controlled to operate. The method aims at solving the problem of response lag of existing single temperature feedback control, it is ensured that the preheating air temperature is stably maintained in the optimal combustion interval of the boiler, meanwhile, the energy efficiency of a heat pump system is optimized, abrasion of key components is reduced, and accurate and cooperative matching of the heating capacity of the heat pump and the preheating requirement of combustion air of the boiler is achieved.

The invention provides a control method and device, refrigeration equipment, electronic equipment and a readable storage medium, and relates to the technical field of refrigeration equipment. When the chamber temperature is larger than the preset temperature threshold value, the inverter compressor is controlled to be started, and the inverter compressor is made to reduce the chamber temperature at the first rotating speed; when the chamber temperature is smaller than or equal to the preset temperature threshold value, the inverter compressor is controlled to stop, the chamber temperature rises under the action of the environment temperature till the chamber temperature is larger than the preset temperature threshold value again, and one-time circulation is formed; the first rotating speed is determined based on the power-on duration ratio in the last circulation. According to the technical scheme, the first rotating speed of the next cycle is dynamically adjusted based on the startup duration ratio in the previous cycle, so that the output power of the inverter compressor is precisely matched with the refrigeration requirement, the inverter compressor operates under the working condition of the optimal rotating speed or operates under the working condition close to the optimal rotating speed, energy consumption of refrigeration equipment is reduced, and the refrigeration efficiency is improved. And the energy-saving effect is better.

The invention discloses a control method for a photovoltaic energy storage system, and the method comprises the steps: selecting an operation mode, the operation mode comprises a first mode, and in the first mode, step 1, judging whether the power generation amount of a photovoltaic system is sufficient or not; 2, if the phase change material is sufficient, the photovoltaic system supplies power to the inverter compressor, the operation frequency of the inverter compressor is controlled, the inverter compressor is shut down until the phase change material in the photovoltaic energy storage system reaches the set temperature, and in the process, the battery is charged with surplus electricity; 3, if not, the operation frequency of the inverter compressor is controlled according to the photovoltaic generating capacity at the current moment and the preset temperature condition, and the inverter compressor is shut down until the phase-change material reaches the set temperature; 4, judging whether the photovoltaic generating capacity at the current moment meets the requirement that the inverter compressor operates at the lowest frequency of the standard working condition or not; and 5, if not, power is supplied to the inverter compressor through the battery and the photovoltaic system at the same time, and the inverter compressor is made to operate at the lowest frequency of the standard working condition and shut down until the phase change material reaches the set temperature or the voltage of the battery is lower than the set voltage value. The technical effect that the endurance of the energy storage system can be greatly prolonged while enough energy storage efficiency is guaranteed is achieved.

The invention relates to the technical field of air conditioner refrigeration, and discloses an intelligent energy-saving air conditioner refrigeration system based on the frequency conversion technology and a control method thereof.The intelligent energy-saving air conditioner refrigeration system comprises various sensors used for collecting environment data in real time, and the environment data comprise but not limited to temperature, humidity, illumination and personnel activity information; the control unit is connected with the inverter compressor and the multivariable sensor network and is used for generating a control signal according to the environment data so as to dynamically adjust the operation frequency of the inverter compressor; the control unit comprises a data processing module used for preprocessing environment data collected by the multivariable sensor network; through a multivariable adaptive control algorithm, various environmental factors such as temperature, humidity, illumination and personnel activity information are comprehensively considered, and the operation frequency of the inverter compressor is dynamically adjusted. Compared with a traditional air conditioning system which only depends on a single temperature variable for control, the indoor set temperature can be more precisely maintained, temperature fluctuation is reduced, and the temperature control precision is remarkably improved.

The invention relates to the technical field of refrigeration house unit control, in particular to a frequency conversion-fixed frequency refrigeration house unit control method based on cooperative control. The method comprises the following steps: establishing a control basis through system initialization and parameter setting, acquiring multi-dimensional data such as temperature in a library, compressor current and door state, and packaging the multi-dimensional data into a system real-time state data packet; performing verification filtering processing on the acquired data to generate a filtering temperature value and a safety state identifier; the real-time temperature difference and the change trend are analyzed based on the temperature data, the load state is determined through a load evaluation model, an inverter compressor independent operation mode or a variable frequency-fixed frequency compressor cooperative operation mode is intelligently selected, and operation parameters are dynamically optimized; and corresponding energy-saving and protection strategies including condensation fan adjustment, heat recovery management, door state linkage control and time-of-use electricity price response are executed according to the operation mode. According to the control method, the defects of a traditional control method in the aspects of energy efficiency and stability are overcome, and intelligent management and energy-saving optimization of the refrigeration house unit are achieved.

The application discloses a kind of based on commercial refrigerator's variable frequency compressor control optimization method, it is related to refrigeration optimization control technical field, the commercial refrigerator is divided into multiple independent temperature control regions, and monitoring point is deployed in each region, realizes fine temperature control and load management;Based on the load index F of the i temperature control region of goods load and artificial operation behavior zzs,i Calculation method is used to identify the load condition of each temperature control region, and the dynamic refrigeration demand of the refrigerator is met by adjusting the refrigerant flow, and the refrigerant flow adjustment index R_adj is used to realize accurate control of each temperature control region, compared with the traditional fixed-frequency compressor adjustment, the refrigeration capacity can be flexibly adjusted according to real-time demand. The pressure stability index is used to monitor the evaporation pressure and condensation pressure, and automatically trigger the optimization instruction to adjust the operating parameters of the variable frequency compressor and simultaneously optimize the refrigerant flow to ensure the balance of refrigeration in each region.

The invention discloses a refrigeration control method based on inverter compressor control, which relates to the technical field of refrigeration equipment control, and comprises the following steps: acquiring operation data of a refrigeration system according to a preset period, and extracting a thermal response characteristic representing a cooling rate attenuation acceleration by performing differential processing on an indoor temperature; and calculating a thermal rebound sensitivity characteristic by combining the frequency change gradient. A thermal inertia potential energy index representing the heat storage load of the enclosure structure is generated through time domain accumulation processing, a nonlinear drift modulation model is constructed accordingly, and a virtual set temperature and a dynamic frequency lower limit value are generated. And finally calculating a basic adjusting frequency based on the virtual set temperature, and selecting the maximum value of the basic adjusting frequency and the lower limit value of the dynamic frequency as a target driving frequency. Through cooperation of algorithm soft traction and physical hard lifting, the problem of overshoot oscillation in a complex thermal environment is solved, and temperature control stability and energy saving performance are improved.

The embodiment of the invention discloses a linear cooling control method for an environmental test chamber, which comprises the following steps of: determining the rotating speed of a variable-frequency compressor of each equally divided cooling section according to a cooling theoretical parameter of each equally divided cooling section, a second cooling parameter of the environmental test chamber, a linear cooling rate and an operating parameter of the variable-frequency compressor; according to the cooling theoretical parameter of each equally divided cooling section, the third cooling parameter of the environmental test box, the linear cooling rate and the electronic expansion valve operation parameter, determining the electronic expansion valve step opening of each equally divided cooling section; according to the first operation data of the inverter compressor and the evaporator in each equally divided cooling section, the final temperature of the environmental test box, the operation parameters of the evaporator fan and the linear cooling rate, the rotation speed of the evaporator fan in each equally divided cooling section is determined; and according to the second operation data of the inverter compressor and the condenser in each equally divided cooling section, the operation parameters of the condenser fan and the linear cooling rate, the rotating speed of the condenser fan in each equally divided cooling section is determined.

The utility model discloses a plane damping structure for an inverter compressor, which comprises a machine body and a crankshaft rotationally connected to the machine body, a plane bearing is arranged on the crankshaft, and a damping gasket is arranged between the plane bearing and the machine body. According to the damping gasket, the plane bearing can be tightly attached to a machine body, the damping gasket plays a role in buffering between the plane bearing and the machine body, axial movement of the plane bearing can be restrained when the compressor runs at a high speed, vibration and noise of the bearing in the running process are reduced, and therefore the running stability of equipment is improved. The damping gasket can play a buffering role between the plane bearing and the machine body and reduce abrasion, in addition, the contact area between the plane bearing and the plane bearing supporting face on the machine body can be increased, axial pressure distribution of the plane bearing is balanced, local accelerated abrasion caused by uneven stress of the plane bearing is prevented, and therefore the service life of the plane bearing is prolonged.

The control method comprises the steps that the rotating speed of a high-temperature-stage inverter compressor is mainly comprehensively determined by the high-temperature-stage exhaust temperature, the high-temperature-stage condenser temperature, the high-temperature-side outlet temperature of an intermediate heat exchanger and the high-temperature-stage return air temperature; through dynamic adjustment of the first fuzzy PID controller, the working condition and energy efficiency of the high-pressure side of the system are optimized; the rotating speed of the low-temperature-stage frequency conversion compressor is mainly comprehensively determined by the temperature in the box, the real-time rotating speed of the high-temperature-stage compressor, the low-temperature-stage exhaust temperature, the temperature of the intermediate heat exchanger and the low-temperature-stage return air temperature, and the rotating speed is dynamically adjusted through the second fuzzy PID controller so as to ensure that the temperature in the box is accurate and stable and is matched with the high-temperature-stage capacity in real time. Through cooperative control of the parameter groups, the problems of low efficiency and unstable operation caused by mismatching of two-stage capabilities of the cascade system are solved, and efficient, stable and reliable operation of the system under all working conditions is realized.

The invention relates to the technical field of air source heat pump steam engines, in particular to an efficient and environment-friendly air source heat pump steam engine and application of the efficient and environment-friendly air source heat pump steam engine. A steam outlet of a gradient type liquid separation evaporator communicates with a gas-liquid separation tank and a first steam inlet of an inverter compressor through a four-way valve, and a monitoring assembly is arranged between the inverter compressor and the four-way valve; the variable-frequency compressor is communicated with the double-flow-channel condenser, the double-flow-channel condenser is communicated with the liquid storage device, the liquid storage device is communicated with the flash tank type economizer through the two-stage throttling assembly, the top of the flash tank type economizer is communicated with a steam supplementing opening of the variable-frequency compressor, and the flash tank type economizer is communicated with the gradient type liquid separation evaporator through the two-stage throttling assembly. The gradient type liquid separation evaporator is provided with a low-temperature auxiliary assembly. By the adoption of the structure, air serves as a heat source, zero pollutant emission is achieved, the frequency of the inverter compressor is dynamically adjusted according to loads, high efficiency and energy saving are achieved, the operation cost is reduced, and requirements of multiple fields such as textile printing and dyeing, food processing, chemical and medicine and agricultural greenhouse heating are met.

The invention provides a wide-rotating-speed variable-frequency compressor for a refrigeration appliance and a working method, relates to the field of compressors, and aims at solving the problem that abrasion is aggravated when an existing compressor is expanded to a low-speed area and a high-speed area. The oil outlet structure of the eccentric shaft of the crankshaft is changed, the V-shaped groove is additionally formed in the position of the crankshaft seat of the cylinder seat, and due to the special assembly synergistic effect of the installation element, the rotor and the stator, abnormal abrasion is reduced; the eccentric shaft oil outlet hole in the crankshaft guides lubricating oil from the main shaft oil groove to the oil outlet of the eccentric shaft; and lubricating oil is uniformly thrown to friction pairs such as a piston cylinder hole through the through groove in the side face of the oil outlet, sufficient lubrication of the friction pairs at the low rotating speed is ensured, and abrasion caused by insufficient oil supply is avoided.

The invention relates to a refrigerating system control method and device, computer equipment and a computer readable storage medium, and the method comprises the steps that in the operation stage of a refrigerating system, the target frequency of an inverter compressor is obtained according to the required refrigerating capacity of a secondary refrigerant side and the target condensation temperature and target evaporation temperature of a refrigerant side; controlling the inverter compressor to output by taking the target frequency as the current frequency, and running for a first preset duration; and when the current frequency is within the upper and lower limit range of the target frequency, the current frequency of the inverter compressor is adjusted based on the relation between the actual liquid supply temperature flowing to the evaporator from the refrigerant side and the target liquid supply temperature. The actual liquid supply temperature is close to the target liquid supply temperature so as to guarantee the temperature control effect, meanwhile, the inverter compressor can operate at the frequency matched with the temperature control working condition, the inverter compressor is prevented from operating at the high frequency all the time, power consumption of a refrigerating system and a heating system is reduced, meanwhile, temperature control through excessive dependence on the heating system can be avoided, and the energy consumption of the refrigerating system and the heating system is reduced. And the temperature control effect is ensured.

The invention provides an instant marinated meat cold chain storage and transportation and temperature control adjusting device and an adjusting method, and relates to the technical field of food processing and fresh keeping, the instant marinated meat cold chain storage and transportation and temperature control adjusting device comprises a multi-temperature-zone storage and transportation unit, an environment monitoring module, a dynamic temperature adjusting module and a central control unit, and the multi-temperature-zone storage and transportation unit is internally provided with an ice temperature zone, a refrigeration zone and a buffer transition zone for independent temperature control; the environment monitoring module integrates various environment parameter sensors and is used for collecting environment data in a storage and transportation environment in real time; the dynamic temperature adjusting module comprises a semiconductor chilling plate, a phase change material layer, an inverter compressor, an electromagnetic valve array and an ultrasonic humidifier which are respectively arranged in an ice temperature area, a refrigeration area and a buffer transition area, and the central control unit controls the dynamic temperature adjusting module; the freezing point of the marinated meat is accurately matched through multi-temperature-zone independent temperature control and the phase-change material, so that the refrigeration shelf life of the marinated meat is prolonged compared with that of traditional marinated meat, the total number of bacterial colonies is reduced, and the texture retention rate is increased.

A compact freezer unit for supplying conditioned air to the interior of a structure is provided herein. The compact freezer unit includes a housing containing one or more components of the freezer unit, the housing having dimensions of height, width, and depth. The components include an evaporator comprising one or more coils and an evaporator fan, a condenser and a condenser fan, a Direct Current (DC) Enhanced Vapor Injection (EVI) inverter compressor, an economizer for separating liquid and vapor refrigerant, a 4-way valve and a chassis belt electric heater configured to defrost one or more surfaces, one or more sensors for sensing a condition and generating an output signal received by a controller, and a plurality of refrigerant lines fluidly connecting the condenser and the evaporator.

The invention relates to the technical field of swimming pool dehumidification unit control, in particular to a swimming pool dehumidification unit control method, system and equipment based on direct-current variable-frequency driving. The humidity sensors are arranged at the air inlet and the air outlet of the swimming pool dehumidification unit to collect data, and the dynamic compensation model is established to correct the sampling value; firstly, the operation frequency and environment temperature data of an inverter compressor are obtained, a temperature correction factor is determined by combining the swimming pool water temperature, and a humidity sampling value is dynamically compensated through a frequency compensation coefficient; then determining a compressor adjustment target value based on the corrected system humidity value, and calculating a fan rotating speed and an electronic expansion valve opening degree by adopting a parameter matching model; finally, dynamic adjustment is achieved through a PID algorithm, and a fuzzy rule base is introduced for multi-parameter coupling optimization. The humidity detection precision is improved, cooperative control of all execution components of the system is achieved, and the operation effect of the swimming pool dehumidification system is remarkably improved.

The invention belongs to the technical field of oil gas recovery, and discloses an ultralow-temperature condensation and ultralow-emission oil gas recovery system and method.A component self-adaptive gradient matching mixed working medium is adopted to be matched with a single-stage inverter compressor, oil gas component online detection and an AI algorithm are combined, the working medium ratio can be dynamically adjusted so as to accurately meet the refrigeration requirements of oil gas with different components, and the oil gas recovery efficiency is improved. A complicated cascade refrigeration structure is not needed, so that the operation stability is improved while the system is simplified; due to the design of the integrated composite heat exchanger, the heat exchange structure is optimized, the cold energy loss is reduced, the heat exchange efficiency is improved, a stable ultralow-temperature cold source is provided for oil-gas deep condensation separation, and oil-gas deep separation is guaranteed from the refrigeration end; the pre-separation module integrates multiple pretreatment functions, strictly controls the cleanliness of oil gas through a secondary pretreatment mechanism, removes impurities in the oil gas, prevents the impurities from blocking, abrading and other influences on the system in an ultralow-temperature environment, and guarantees continuous operation of the system.

The invention discloses a double-sensing segmented frequency conversion control method and device for an ultralow-temperature refrigerator. The method comprises the steps that the environment temperature and the temperature in a box are collected, staged rotating speed control is conducted on an inverter compressor in the first-time power-on or cold start stage, and the compressor is made to be increased to the preset target rotating speed from the start rotating speed step by step; in the operation stage, the rotating speed adjusting amount is determined according to the temperature deviation between the temperature in the box and the target temperature and the change trend of the temperature deviation, and a rotating speed instruction is generated by dynamically correcting the control parameters; and in the operation cycle formed by starting and stopping of the compressor, the starting rotating speed and / or the operation rotating speed upper limit of the next operation cycle is updated according to the comparison result of the actual operation duration and the preset operation duration. The output capacity of the compressor can be matched with load change, starting impact is reduced, temperature control stability is improved, and energy consumption is optimized.

The utility model relates to the technical field of sample boxes, and provides a constant temperature and humidity box of an inverter compressor, which comprises a box body and a sample storage box, the sample storage box is arranged in the box body, the front of the box body and the front of the sample storage box are opened, a partition plate is arranged in the sample storage box, and the partition plate is arranged in the box body. The area between the mounting plate and the rear end of the box body is an electrical component mounting area, a low-voltage transformer and a steam generator are sequentially mounted in the electrical component mounting area from top to bottom, and the area between the mounting plate and the bottom wall of the box body is an equipment mounting area. And a condenser, an inverter compressor and a frequency converter are sequentially mounted in the equipment mounting area from back to front. According to the utility model, the function of adjusting the operation frequency of the inverter compressor is utilized, so that a large amount of electric energy can be saved, meanwhile, the water consumption is greatly reduced, and great economic prospects are achieved.

This application discloses a dual high-efficiency dual-frequency conversion air source heat pump unit and its temperature control system. The dual high-efficiency dual-frequency conversion air source heat pump unit includes a shell-and-tube heat exchanger, a first working system, and a second working system. The shell-and-tube heat exchanger includes a first opening, a second opening, and a third opening, with the third opening used to connect to the indoor working water pipe. The first working system includes a variable frequency compressor, a four-way reversing valve, a variable frequency fan, a first sub-circuit, a second sub-circuit, and a third branch. The first sub-circuit is connected sequentially from the first opening to the condenser interface, exhaust interface, and outlet of the four-way reversing valve and the variable frequency compressor. The third branch is connected in parallel with the main heating electronic expansion valve and includes a one-way valve and an auxiliary cooling electronic expansion valve, with the valve port diameter of the auxiliary cooling electronic expansion valve being larger than that of the main heating electronic expansion valve. The variable frequency fan is configured to blow airflow at ambient temperature onto the finned heat exchanger. The second working system has the same structure as the first working system.

The invention relates to the technical field of intelligent equipment, and discloses a method, device and equipment for controlling a compressor of refrigeration equipment and a storage medium. The refrigeration equipment comprises a refrigeration chamber and a freezing chamber, and the method comprises the steps that under the condition that a compressor is in a running state, the first current refrigeration temperature of the refrigeration chamber is obtained; under the condition that the first current refrigeration temperature is larger than or equal to the starting temperature, a compressor is controlled to conduct refrigeration operation on a refrigeration chamber; and under the condition that the first current refrigeration temperature is smaller than or equal to the shutdown temperature, the compressor is controlled to conduct refrigeration operation on the freezing chamber. Therefore, the variable-frequency compressor can perform refrigeration operation by switching different chambers without shutdown for a long time, non-shutdown energy-saving control of the variable-frequency compressor is realized, and resources are saved.

The embodiment of the present application discloses a kind of test chamber cooling control method and test chamber, cooling control method includes: the set parameter of test chamber is divided into set quantity of segment by average;The reference increment of each set parameter in each segment is calculated;The target control value of each set parameter in different segment is determined based on each reference increment and the control gain coefficient of each set parameter;Based on the target control value of each set parameter in different segment, each set parameter in corresponding segment is regulated and controlled, to control test chamber to carry out cooling.This application solves the technical problem that the existing environment test chamber only relies on the maximum refrigeration capacity to select the fixed frequency compressor, the fixed frequency compressor has higher energy consumption, and the capacity is wasted in the initial stage of operation, realizes the technical effect of regulating and controlling each set parameter including variable frequency compressor speed in different time periods and high precision, improves the reliability of test chamber operation, and reduces the operation energy consumption of test chamber.

The utility model relates to the technical field of compressors, and discloses a control device protection structure for driving a freezing and refrigerating variable-frequency compressor, which comprises a mounting frame, screw holes are respectively arranged on the surface of the mounting frame, screws are in threaded connection with the inner walls of the screw holes, a protection frame is fixedly connected with the surface of the mounting frame, and the protection frame is fixedly connected with the surface of the mounting frame. A protection buffering assembly is arranged on the surface of the protection frame, a ventilation adjusting assembly is arranged on the surface of the inner wall of the protection frame, and the protection buffering assembly specifically comprises bottom plates fixedly installed on the two sides of the inner wall of the protection frame. The protection buffering assembly is arranged for protection buffering, when the protection plate is impacted, a clamping block and a connecting concave block drive a buffering spring to conduct compression buffering, when the impact force is too large, foam is squeezed and buffered through a push rod and a squeezing disc, elements in the control device are prevented from being damaged due to vibration, and safety is improved; therefore, the protection and buffering effects are achieved.

The application provides a control method of a refrigeration system, comprising: when powered on, determining whether the ambient temperature Th fluctuates when the first preset condition or the second preset condition is met; if not, controlling the frequency of the variable frequency compressor to decrease by △F1; wherein the first preset condition is that the exhaust pressure P at the exhaust port of the variable frequency compressor fluctuates twice within t1 time from the starting moment; the second preset condition is that P accumulatively fluctuates three times within t2 time from the starting moment; t1 < t2; the fluctuation range of the exhaust pressure P is P > P0 + △P or P < P0 - △P, P0 is the exhaust pressure value at the starting moment, and △P = 0.1-0.3 MPa; the fluctuation range of the ambient temperature Th is Th > Th0 + 2 DEG C or Th < Th0 - 2 DEG C, Th0 is the ambient temperature at the starting moment, and the control method is simple and convenient, and the variable frequency compressor can be controlled to operate in a stable state.

The invention relates to the field of refrigeration, in particular to a low-temperature vortex condensing unit control method and system.The low-temperature vortex condensing unit control method comprises the steps that frequency fluctuation characteristics of an inverter compressor before and after change are marked as F0 and F1, a target compressor is started, and a frequency fluctuation characteristic F2 is obtained; recording the difference between F2 and F0 as the load interference of the target compressor; all the fixed-frequency compressors running before the target compressor is started are recorded as a reference compressor set, and the difference between F1 and F0 is recorded as a cooperative interference index; obtaining the load interference of the inverter compressor according to the difference between the cooperative interference index of the reference compressor set and the load interference of the target compressor; and determining the starting time of the fixed-frequency compressor according to the load interference of the running fixed-frequency compressor and the load interference of the variable-frequency compressor. The variable-frequency compressor and the fixed-frequency compressor in the condensing unit are reasonably and synergistically matched to work, and long-term stable operation of the condensing unit is guaranteed.

The invention provides a refrigerator and a control method thereof, and belongs to the technical field of household appliances. According to the method, the starting operation frequency of the inverter compressor in the current starting and stopping period is determined according to the environment temperature detected by the temperature sensor and the starting rate of the last starting and stopping period, and then the adjustment amplitude of the operation frequency of the inverter compressor is determined based on the environment temperature. And the inverter compressor is controlled to operate at the starting operation frequency, and the operation frequency of the inverter compressor is adjusted according to the adjustment amplitude every preset time until the operation frequency of the inverter compressor reaches the upper limit value of the operation protection frequency or the inverter compressor is shut down. Therefore, the operation frequency of the inverter compressor is comprehensively adjusted according to the environment temperature obtained through real-time detection and the starting rate of the last starting and stopping period, so that the operation frequency of the inverter compressor can correspondingly change along with the difference of the environment temperature and the starting rate of the last starting and stopping period. Therefore, the inverter compressor can achieve better working efficiency.

The utility model relates to a passenger near-body cooling device, which is characterized in that exhaust gas of a miniature direct-current variable-frequency compressor is connected with return gas through an air-cooled condenser and a first heat stroke of a micro-channel evaporator, and a load is connected with the micro-channel evaporator through a liquid return pipe and a liquid supply pipe; a liquid return valve, a liquid return temperature sensor, a liquid return pressure sensor, a liquid return flowmeter, an electric heater, a buffer tank, an expansion tank, a liquid return dew point temperature sensor, a liquid return booster pump and a liquid return filter are sequentially arranged on the liquid return pipe, and then the liquid return pipe is divided into two paths, the other path is connected with a direct-cooling condenser through a direct-cooling electromagnetic valve, and is connected to the other hot stroke outlet of the micro-channel evaporator through a direct-cooling one-way valve to be connected with a liquid supply pipe; a branch liquid pipe is branched from the liquid return pipe and is connected with the upper end of the water tank, and a conductivity sensor is arranged in the water tank; the load is a seat cushion and / or a back cushion and / or a side baffle which can be wholly or partially filled with water. The device stably and safely cools the near body of the driver and passengers.

The application discloses a kind of multi-temperature zone air supply heat pump air conditioning systems and its control method, belong to electric automobile air conditioning technical field;The system includes refrigeration system, air supply system and electric control unit;The refrigeration system includes variable frequency compressor, liquid accumulator, outdoor heat exchanger, regenerator and four-way reversing valve;The outlet of regenerator is connected with first throttling device and second indoor heat exchanger respectively, and the outlet of first throttling device is connected to first indoor heat exchanger;First indoor heat exchanger and second indoor heat exchanger are connected to air supply system;The air supply system includes fan, first air outlet and third air outlet;The inlet of first indoor heat exchanger is connected third air outlet;The outlet of first indoor heat exchanger is connected first air outlet and second air outlet respectively.The application obtains multiple different temperature air supply by pre-matching design double heat exchanger structure, and by intermediate throttling, and further temperature adjustment is carried out by electric heating, to realize multi-temperature zone air supply.