1027 results about "Inverter compressor" patented technology

The invention relates to a method for intelligently controlling the frequency of a variable-frequency air-conditioner, comprising the following steps of: (1) reading the temperature difference delta T of the set temperature of the variable-frequency air-conditioner and indoor ambient temperature and calculating a frequency value Ft according to the temperature difference by a frequency converter;(2) reading each running parameter of the variable-frequency air-conditioner and controlling the air-conditioner to stop, or limit the frequency, or reduce the frequency or normally run according to the parameter value by using the frequency converter; (3) if each parameter displays that the frequency needs to be limited, ensuring the adjusted frequency Fobj to be equal to Ft, and if each parameter displays that the frequency needs to be reduced, ensuring the Fobj to be equal to Ft-delta T; (4) if each parameter displays the normal running, adjusting the frequency Ft according to the variation of the delta T in a certain time t1; and (5) outputting the Fobj to a driver of a variable-frequency compressor of the air-conditioner by using the frequency converter. The method can improve the comfort level, the using effect and the service life of the variable-frequency air-conditioner.

The invention relates to a method for controlling a machine room air conditioner based on a variable frequency compressor. The method comprises the following steps of: 1, initializing the machine room air conditioner, and returning an electronic expansion valve to zero; 2, starting an evaporator, and regulating the air velocity of a fan of the evaporator according to air suction pressure Ps; 3, starting the variable frequency compressor, and regulating the frequency H of the variable frequency compressor according to the indoor temperature T0 and the preset temperature TA; 4, starting a condenser in time T2 after the variable frequency compressor is started, and controlling the air velocity of a fan of the condenser according to exhaust pressure PD and the air inlet temperature TD; and 5, controlling the opening Pm of the electronic expansion valve, and performing corresponding compensation on the opening Pm of the electronic expansion valve according to the frequency of the variable frequency compressor. By adopting the method for controlling the machine room air conditioner based on the variable frequency compressor, the temperature is controlled more stably and the fluctuation is low; and the opening of the expansion valve is compensated through the variable frequency compressor, so that the superheat degree is more stable and close to the expected target value.

The invention discloses a cold and warm type frequency conversion air conditioner and a defrosting method thereof. The air conditioner comprises an indoor machine and an outdoor machine, wherein the outdoor machine is provided with a frequency conversion compressor, a four-way valve, a throttling element and an outdoor heat exchanger which are communicated through a connecting pipeline, and the connecting pipeline of the outdoor machine is also provided with a by-pass loop; and the indoor machine is internally provided with an electric heating device which is at least turned on to operate in the defrosting process of the air conditioner. The defrosting method for the air conditioner comprises that when a defrosting condition is reached, the electric heating device is turned on, and a by-pass defrosting process is carried out by the by-pass loop. The air conditioner and the defrosting method not only can guarantee the using comfort of users, but also can improve the defrosting efficiency of the air conditioner, and cannot influence the using reliability of the frequency conversion compressor of the air conditioner.

The invention discloses a method for limiting the max. frequency of a frequency-conversion compressor based on outdoor environmental temperature, which comprises: the change range of outdoor environmental temperature is set; the max. limit frequency of the compressor is set based on the range of outdoor environmental temperature; a temperature sensor senses the outdoor environmental temperature; the relationship is judged between the sensed outdoor environmental temperature and the change range of environmental temperature based on which the max. limit frequency of the compressor is set; the max. limit frequency for the frequency-conversion running of the compressor is determined based on the relationship between the sensed outdoor environmental temperature and the change range of environmental temperature based on which the max. limit frequency of the compressor is set. The method improves the controlling logic for the frequency-conversion compressor, so that the compressor will not breakdown because the compressor increases frequency and accelerates without limit depending upon the outdoor environmental temperature.

The invention relates to a variable frequency air conditioner control method and system. The method includes the steps that 1, the indoor environmental temperature is collected; 2, the difference value between the indoor environmental temperature and a set indoor temperature is worked out; and 3, the operating frequency of an inverter compressor or the rotation speed of a direct-current fan of an indoor unit is adjusted according to the difference value between the indoor environmental temperature and the set indoor temperature. The system comprises an indoor environmental temperature sensor, a controller, the inverter compressor and the direct-current fan of the indoor unit, wherein the indoor environmental temperature sensor is used for collecting the indoor environmental temperature; the controller is used for working out the difference value between the indoor environmental temperature and the set indoor temperature, and adjusting the operating frequency of the inverter compressor or the rotation speed of the direct-current fan of the indoor unit according to the difference value between the indoor environmental temperature and the set indoor temperature. By means of the variable frequency air conditioner control method and system, frequent starting of the inverter compressor can be reduced or avoided, the service life of the inverter compressor is prolonged, a stable indoor environmental temperature is maintained, the comfort degree is improved, and the operative reliability of an air conditioner is guaranteed.

The invention relates to a central air-conditioning system, in particular to a duct air conditioner, namely an enhanced vapor injection air-conditioning circulating system. A vapor injection side electronic expansion valve of the system is subject to discharge superheat control instead of vapor injection superheat control; high discharge superheat is guaranteed, and heating capacity of the system can be further improved by vapor injection; the system is especially applicable to variable frequency compressors; high heating capacity is kept even under different operating frequencies; the system operates stably and fluctuates little. The enhanced vapor injection air-conditioning circulating system comprises a controller, a compressor, a four-way valve, a vapor-liquid separator, an economizer, a solenoid valve and a coolant pipe. The compressor is a variable frequency compressor. The economizer is a plate economizer. The electronic expansion valve controls vapor injection. The vapor injection electronic expansion valve is subject to discharge superheat control instead of vapor injection superheat control; accordingly, high discharge superheat is guaranteed, and heating capacity of the system is further improved by vapor injection. The system is especially applicable to variable frequency compressors; the heating capacity is kept even under different operating frequencies; the system operates stably and fluctuates little.

In the presnet invention, a humidity vefrigerating circulation system is added and correspondingly a humidity control device is added in control system, the system consists of humidifier, dehumification evaporator, cooling storage device and fan, the device can be used either of increasing humidity or dehumidifying to supplement or remove humidity in chamber, it can be used in multiple refrigerating loop with one compressor or with double compressor which can be normal mode or can be frequency conversion mode.

A mute air conditioner mainly comprises a variable frequency compressor, an indoor fan, a controller, an indoor temperature sensor and an environmental noise sensor, wherein the indoor temperature sensor is used for detecting indoor temperature, and the environmental noise sensor is used for detecting environmental noise. The indoor temperature sensor and the environmental noise sensor are respectively connected to the controller and transmit detecting signals to the controller, and the controller is used for selecting and controlling the rotation speed of the indoor fan and the running frequency of the variable frequency compressor according to the detecting signals. The control method for the mute air conditioner is used for reducing noise interference for users from the angle of control by means of sensing change rules of environmental noise and comfort of people, so that the mute air conditioner can be used for intelligently sensing the environmental noise and automatically adjusting the noise to meet better use requirements.

The invention relates to a high-precision constant-temperature and humidity air conditioner operated in a wide temperature range. The air conditioner comprises an outdoor machine and an indoor machine, wherein the outdoor machine is provided with a condenser and a condensing fan; the indoor machine comprises an evaporator, a thermal recovery exchanger, an electric heater, a humidifier and a blower; and a compressor is formed by connecting in parallel a constant-frequency compressor and a variable-frequency compressor (or a digital scroll compressor) and is arranged in the indoor machine. As the system adopts frequency conversion technology or digital vortex technology and electronic expansion valve technology and unique classified evaporator control, condenser fan frequency-conversion control technology and evaporator frostless structural design, the air condition broadens the use environment range, indoor temperature control environment (between 7 and 30 DEG C) and relative humidity control environment (between 35 and 70 percent RH), can be reliably operated in the outdoor high-temperature environment of 45 DEG C, also improves the controlling precision of indoor temperature and humidity, and is applicable to places with severe requirements on temperature and humidity and large environmental temperature change.

The invention relates to an air conditioner, in particular to a method for controlling the supply frequency of a variable frequency compressor, which comprises the following steps that: in a control unit of the air conditioner, indoor unit data and compressor data of a plurality of air conditioners are stored and limited frequency data of the compressor in different temperature environments are stored; signal output terminals of an outdoor unit and a plurality of indoor units of the air conditioner are connected with the control unit; after the air conditioner is turned on, the control unit identifies a compressor signal and an indoor unit signal, receives an indoor environment temperature signal, sets a temperature signal, and receives a fixed wind speed signal; the control unit judges whether an output target frequency is greater than a limited frequency or not according to the identified signal; if the target frequency is greater than the limited frequency of the compressor, the compressor operates according to the limited frequency; and if the target frequency is smaller than the limited frequency of the compressor,, the control unit outputs a control signal to the compressor to operate according to the target frequency. The method can make a compressor in a one-to-multi air-conditioning system adopt the variable frequency compressor.

The multiple heat source multifunctional solar energy heat pump consists of one solar heat collecting system and one multifunctional heat pump system. The solar heat collecting system includes full glass tube solar heat collector, large heat accumulating water tank, solenoid valve and high temperature circulating pump; and the multifunctional heat pump system includes variable frequency compressor, outdoor water cooling source heat exchanger, outdoor air cooling source heat exchanger, indoor air cooling source heat exchanger, indoor coil pipe water heating tank, condensing coil pipe, electronic expansion valve, liquid storage and two electromagnetic triple valves. The solar heat collecting system and the multifunctional heat pump system are connected through the variable frequency high temperature circulating pump and solenoid valve. The present invention can utilize both solar energy and air source as the heat source of the heat pump, and has several functions and raised COP value of heat pump system.

The invention discloses a control method for oil return of a DC inverter compressor, which comprises the following steps of: (1) initially supplying power to start the machine, and setting the opening of an electronic expansion valve according to the number of the started indoor units; (2) adopting different upconvert methods according to the target frequency of the compressor; (3) if an air conditioning unit starts for 10 minutes, starting oil return circulation; and (4) after oil return, if the machine is in a heating mode, judging whether the temperature of an outdoor coil is less than or equal to -12DEG C, if so, beginning defrosting circulation, and starting a conventional automatic adjustment mode after defrosting, otherwise, starting the conventional automatic adjustment mode, and if the machine is not in the heating mode, directly starting the conventional automatic adjustment mode; and (5) when a stop command is received, adopting different stop modes according to different operating frequencies of the compressor. Compared with the conventional methods, the method has the characteristic of effectively solving the problem of oil starvation in the starting process, normally running process and stopping process of the compressor.

The invention discloses a control method for a frequency conversion compressor. The method includes the steps that when the rotation speed of the compressor needs to be adjusted, the average value of start rates corresponding to all start and stop periods of the compressor is calculated before the rotation speed of the compressor is adjusted, and the average start rate is acquired; according to the average start rate and a preset compressor target start rate corresponding to the current environment temperature, the adjusting proportion of the rotation speed of the compressor is calculated; according to the adjusting proportion of the rotation speed of the compressor and the rotation speed of the compressor in the start and stop period before the rotation speed of the compressor is adjusted, the adjusted rotation speed of the compressor is calculated; and according to the adjusted rotation speed of the compressor, the compressor is controlled to operate. The invention further discloses a refrigerator adopting the control method for the frequency conversion compressor to achieve the frequency conversion function. Through the control over the rotation speed of the compressor, the start duration and the stop duration of the compressor can be effectively controlled, and the beneficial effects that noise is lowered and energy is saved can be achieved.

The invention discloses a control method for an air conditioner. The control method comprises the following steps: S1, presetting a target pressure P0 and the superheat degree T0 of the outlet of a target evaporator; S2, acquiring an actual pressure P1 and the superheat degree T1 of the outlet of an actual evaporator; S3, calculating the difference value delta P between the actual pressure P1 and the target pressure P0, and the difference value delta T between the superheat T1 of the outlet of the actual evaporator and the superheat degree T0 of the outlet of the target evaporator; S4, adjusting the frequency of a frequency-variable compressor according to the difference value delta P between the actual pressure P1 and the target pressure P0 to maintain the actual pressure P1 within the range of the target pressure P0, and adjusting the open degree of an electronic expansion valve according to the difference value delta T between the superheat T1 of the outlet of the actual evaporator and the superheat degree T0 of the outlet of the target evaporator to maintain the superheat degree T1 of the outlet of the actual evaporator within the range of the superheat degree T0 of the outlet of the target evaporator; S5, repeating the steps of S2 to S4 according to a preset cycle. The invention also discloses the air conditioner applying the control method. By the control method, the universality of an outdoor unit is improved.

The invention discloses a control device of a frequency convertible refrigerator and a control method thereof. The control device comprises a frequency conversion control panel (3) and an intelligent control panel (2) connected with the frequency conversion control panel (3), wherein, the input end of the intelligent control panel (2) is connected with a temperature sensor (1), and the output end thereof is connected with the input end of the frequency conversion control panel (3); the control device is added with the intelligent control panel (2), so as to add the environmental temperature and the accumulated running time of a compressor into the running control of the refrigerator; according to the temperature of a refrigerating room and a cold preserving room, the cooling rate, the environmental temperature and the accumulated running time of the compressor, the control device of the refrigerator can control the running frequency of the frequency conversion compressor in real time to avoid the compressor from being started and stopped frequently, and the service life of the compressor can be prolonged. The invention improves the refrigerating efficiency of the refrigerator at utmost, and has the advantages of rapid temperature reduction, little energy consumption and easy energy conservation. By adopting the frequency convertible refrigerator, the effects of food cold preserving and fresh-keeping are good.

The invention provides a frequency and flow changing heat pump water heater, relates to a liquid heater with a heat generation device by using a heat pump. The frequency and flow changing heat pump water heater comprises a unit part, a water circulating part, water tubes and communication lines connected inside the water circulating part. The unit part comprises a frequency-changing compressor, a cross tee change valve, a double pipe condenser, an unloading valve, an electronic expansion valve, an evaporator, a fan, a controller, various temperature sensors and pressure sensors. The water circulating part comprises a pump, an outlet valve, a ball valve, a water tank, a water temperature sensor and a filter. The frequency and flow changing heat pump water heater takes the frequency-changing compressor as the power source of the system, takes the electronic expansion valve as a throttling device and uses the water temperature sensor to prevent freezing. Compared with combustion gas, fuel oil, coal or electronic water heater, the frequency and flow changing heat pump water heater has safety, environmental protection and energy saving properties. Compared with the heat pump hot water units, the throttling of which uses rated frequency compressor and thermostatic expansion valve or capillary tubes, the frequency and flow changing heat pump water heater has high heating output power, good heating effect and good environmental adaptability.

The invention discloses a protection method for preventing superheat during the heating of a multi-connection air conditioning unit, which comprises the following steps of: measuring the temperature Tm in the middle of an indoor heat exchanger (3) in each indoor machine; when Tm is equal to or greater than 56 DEG C and smaller than 60 DEG C, enforcing an outdoor fan to stop and enforcing an indoor fan to run under a high wind level as well as commanding a frequency conversion compressor (2) of each outdoor machine to run under a down frequency by a main controller; and when Tm reaches 60 DEG C, commanding the frequency conversion compressor (2) of each outdoor machine to directly reduce the frequency to a fixed value and to run under the fixed frequency, stopping a fixed frequency compressor (1) of one outdoor machine, and then stopping a running fixed frequency compressor (1) of one outdoor machine every 10 seconds by the main controller. Through the protection method, high voltage faults can be avoided, the system can run stably and the damage of the unit is avoided.

The invention discloses an intelligent defrosting control method for a parallel multiple on-line unit with multiple compressors. The intelligent defrosting control method comprises the following steps: (1) when the multiple on-line unit operates in a heating mode, continuously operates for 30-60 minutes, lasts for 2-5 minutes and satisfies one of the following conditions, an outdoor electrical control system emits a defrosting command; (2) a first direct-current inverter compressor starts a defrosting process after receiving the defrosting command; (3) a second direct-current inverter compressor starts a defrosting process after receiving a starting command; and (4) the first direct-current inverter compressor and the second direct-current inverter compressor exit the defrosting process if one of the following conditions is satisfied in the defrosting process. The intelligent defrosting control method is used for coordinating and controlling the action sequences of the components in the intelligent defrosting process, so that the air conditioner can normally enter the defrosting process, process the defrosting process and exit the defrosting process.

The invention provides an air conditioner and a control method thereof. The air conditioner comprises a controller, a condenser, an inverter compressor, a throttling device and an energy storing device; the condenser is positioned in the energy storing device, and one end of the condenser is connected with the inverter compressor and while the other end of the condenser is connected with the throttling device. The air conditioner further comprises a first temperature sensor which is arranged on the energy storing device, and a second temperature sensor which is arranged on a pipeline through which the condenser is connected with the throttling device; the second temperature sensor is positioned at the outer part of an energy storing agent of the energy storing device; the inverter compressor, the first temperature sensor and the second temperature sensor are both electrically connected with the controller; when the temperature value detected by the first temperature sensor is more than the first preset value, and the temperature value detected by the second temperature sensor is less than the second preset value, the controller controls the inverter compressor to lower down the working frequency; when the temperature value detected by the second temperature sensor is more than the second preset value, the controller controls the inverter compressor to stop working, and therefore, the intelligent control of the air conditioner is achieved.

The invention relates to the technical field of refrigerators, in particular to a frequency control method for a variable frequency refrigerator. The frequency control method includes the steps: S1, a variable frequency compressor runs under a set frequency and stops after running for a set on time T; S2, the variable frequency compressor waits for a set off time K and starts; S3, an on-rate, N=T/(T+K), is set; S4, after running for an actual on time t, the variable frequency compressor stops, and after waiting for an actual off time k, the variable frequency compressor starts, and an actual on-rate, n=t/(t+k), is set; S5, comparison on the set on-rate N and the actual on-rate n is made, if the actual on-rate n is smaller than the set on-rate N, the variable frequency compressor runs under a lower frequency next time, and the variable frequency compressor is at a lower speed; if the actual on-rate n is larger than the set on-rate N, the fact that the variable frequency compressor is poor in refrigerating capacity is judged, the variable frequency compressor runs under the higher frequency next time, and the variable frequency compressor is at a higher speed.

The invention discloses a heating start method of a multi-split air conditioner. Coordinate control is performed according to different time intervals during which each part in an air-conditioning system runs at different times. Action time sequence of each part is sequentially and reasonably coordinated according to respective start time and start time interval of each part in the multi-split air conditioning system, so that a four-way valve is enabled to be successfully switched, the multi-split air conditioning system can be controlled in a normal and reliable running way, the disorder of running of the whole multi-split air conditioning system is avoided, a direct-current inverter compressor is enabled to normally run, and the service life of the direct-current inverter compressor is prolonged.

To provide a refrigerating apparatus that can control the supercooling degree of liquid refrigerant irrespective of changes in circulating refrigerant amounts in a refrigeration cycle, a refrigerating apparatus includes a refrigeration cycle having one or more compressors or inverter compressor, a condenser, an expansion valve, and an evaporator; a liquid introduction circuit that guides decompressed refrigerant obtained by extracting one part of high pressure liquid refrigerant from the refrigeration cycle and decompressing, to a supercooling heat exchanger provided in the refrigeration cycle to perform heat transfer between the decompressed refrigerant and high pressure liquid refrigerant, and then introduces the refrigerant into refrigerant for intake into the compressors or inverter compressor or an intermediate pressure part of these compressors; a controller controlling shutdown of the compressors or driving frequencies of the inverter compressor based on suction pressure detection values with respect to pressure setting values for suction pressure of the compressors or inverter compressor; and a flow controller controlling the amount of high pressure liquid refrigerant flowing through the liquid introduction circuit based on the circulating volume of refrigerant in the refrigeration cycle.

The invention discloses a frequency control method of a compressor of a variable frequency air conditioner. The method includes the following steps that (1) before the compressor is started, the target operating frequency of the compressor is worked out according to the difference of the current indoor environment temperature and the set temperature; (2) two minutes later after the compressor is started, the target operating frequency of the compressor is regulated according to the difference of the current indoor environment temperature and the set temperature; (3) after the compressor operates for two minutes, the difference of the current indoor environment temperature and the set temperature is compared once every two minutes, the refrigerating or heating effect of the air conditioner is judged according to changes of the difference of the current indoor environment temperature and the set temperature, and when the temperature difference is kept constant or is increased, the current operating frequency of the compressor is compensated. A more linear control mode is provided for the current operating mode of the compressor based on the use demands of users and the operating characteristics of the variable frequency compressor, use experience of the users is improved, and the operating range of the compressor is expanded.

The invention discloses a frequency control method and system for an electric frequency conversion heat pump hot water machine compressor. The method includes the steps that the outlet water temperature of a heat exchanger and the water tank temperature of a water tank are detected; the set temperature of the outlet water of the heat exchanger is generated according to the temperature of the water tank; control over the frequency of the frequency conversion compressor is conducted according to the outlet water temperature and the set outlet water temperature of the heat exchanger. According to the frequency control method and system of the frequency conversion heat pump hot water machine compressor, the mode that control over the frequency of the compressor through the outlet water temperature of the heat exchanger is provided, the operation frequency of the frequency conversion compressor can be lowered effectively, the unit operation energy efficiency is improved, and the reliability of the compressor is guaranteed on the condition that the outlet water temperature is constant is guaranteed.