105results about How to "Improve defrosting speed" patented technology

The invention discloses a defrosting control method of an air conditioner. The control method comprises the following steps that environment temperature and the temperature of an outdoor heat exchanger outlet or the temperature of a super cooling section are obtained; whether the defrosting condition is met or not is judged according to the environment temperature and the temperature of the outdoor heat exchanger outlet or the temperature of the super cooling section; when the judgment result shows that the defrosting condition is met, the wind speed of an indoor fan is decelerated, an electronic expansion valve is controlled to be lowered to the first opening degree state, an outdoor fan is closed, a compressor is regulated to the defrosting frequency, after the preset time, and the first ascending speed is used for controlling the electronic expansion valve to be raised to the second opening degree state, wherein the opening degree value of the second opening degree state is greater than the opening value of the first opening degree state. The defrosting control method of the air conditioner has the advantages that the defrosting can be realized without stopping the compressor, the method is simple, and the reliability is high. The invention also provides the air conditioner.

The invention provides an air conditioner. The air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device, an outdoor heat exchanger, a defrosting bypass branch and an intermediate heat exchanger, wherein the compressor, the four-way valve, the indoor heat exchanger, the throttling device and the outdoor heat exchanger are connected to one another to form a main loop; gas exhausted from the compressor enters the outdoor heat exchanger through the defrosting bypass branch so that defrosting can be implemented; the intermediate heat exchanger comprises a first branch and a second branch, and is serially connected between the outdoor heat exchanger and an indoor heat exchanger through the first branch; the second branch is connected to a defrosting liquid outlet of the outdoor heat exchanger and a gas sucking opening of the compressor; and defrosting refrigerant, refrigerant in the second branch and refrigerant in the first branch are in heat exchange, and enter a gas sucking opening of the compressor after being evaporated. By-pass defrosting can be implemented by the gas exhausted from the compressor, by the intermediate heat exchanger, the evaporation efficiency of the refrigerant is improved, the defrosting speed is increased, and the thermal comfort of a room and the heating energy efficiency of the air conditioner are improved. The invention also provides a control method of the air conditioner.

The invention relates to the field of air conditioners, and discloses an air conditioner defrosting control device and a method. The air conditioner comprises an outdoor draft fan. The air conditioner defrosting control device comprises a controller for implementing the following steps: judging whether the air conditioner is in a defrosting phase; and controlling the outdoor draft fan to rotate reversely for exchanging the heat through convection if the air conditioner is in the defrosting phase. By the technical scheme, the defrosting speed of the outdoor heat exchanger is accelerated, accordingly increasing the using efficiency of the air conditioner, avoiding the uncomfortable feeling in the customer use, and increasing the defrosting degree, increasing the low temperature heating capacity, and thereby increasing the seasonal energy efficiency.

The invention belongs to the field of air conditioners, and relates to an air-conditioner outdoor unit hood with a defrosting structure, in particular to an air-conditioner outdoor unit capable of quickly defrosting. Due to more strong winds in winter, a large amount of heat is brought away by air flow, air-conditioner outdoor units are all mounted on the walls, temperature of one sides of the air-conditioner outdoor units are very low due to air current flow between the outdoor units and the walls, water is enabled to be frosted or frozen again by the strong winds when frost is molten into flow downwards along heat exchangers, consumed electrical energy is increased, and time for defrosting is prolonged. A steady-flow insulation cavity with the upper end closed is arranged on one side of a heat exchanger of an outdoor unit (1), transverse flow of air on two sides of the steady-flow insulation cavity is prevented through air blocking structures, and the rear side and / or the lower side of the steady-flow insulation cavity is provided with an opening serving as an air inlet of the outdoor unit (1). Hot air in a defrosting are is effectively prevented from escaping upwards by the steady-flow insulation cavity, air current flow is reduced, insulation effect is good, defrosting speed is increased, and heating effect and comfort of an air conditioner are improved.

The invention provides a control method for a draught fan of a refrigerator compartment. The method comprises the following steps of: detecting a first temperature of a compartment, if the first temperature of the compartment is higher than a first predetermined temperature, refrigerating the compartment and detecting a door of the compartment whether the door is opened or not, if the door is closed, controlling the start of the draught fan; if the first temperature of the compartment is lower than a second predetermined temperature, stopping refrigeration and closing the draught fan, and detecting an evaporator of the compartment whether is defrosted or not, if the evaporator is defrosted, controlling the start of the draught fan and judging a setting temperature of the compartment whether the setting temperature is higher than a third predetermined temperature, if the setting temperature is higher than the third predetermined temperature, judging defrosting is ended or not, if the defrosting is ended, controlling the closing of the draught fan; if the setting temperature is lower than the third predetermined temperature, judging the defrosting time whether reaches scheduled time or not, if the defrosting time reaches the scheduled time, controlling the closing of the draught fan; wherein the second predetermined temperature is lower than the first predetermined temperature. In the embodiment disclosed by the method, when the evaporator is defrosted, the draught fan can be selectively started, therefore, humidity of the compartment can be effectively improved, a moisture preserving demand of the compartment can be met, and freshness retaining time of foods can be improved.

The invention discloses a heat pump system, which comprises a compressor, a four-way valve, a liquid-vapor separator, an indoor heat exchanger, an outdoor heat exchanger, a first throttling mechanism and a first bypass valve for selectively bypassing the first throttling mechanism. According to the heat pump system provided by the embodiment of the invention, the flow rate of a refrigerant in the system can be increased by opening the first bypass valve, the evaporating temperature of the refrigerant entering the outdoor heat exchanger is raised, and frost on the surface of the outdoor heat exchanger is slowly thawed without performing a defrosting reverse cycle. Since the refrigerant reverse cycle is not required during defrosting, the indoor heat exchanger can be used as a condenser to produce heat all the time, the temperature fluctuation of the indoor heat exchanger is reduced, and the operation efficiency of the system is also obviously improved. The defrosting can be performed when a small amount of frost is accumulated by the outdoor heat exchanger, so that the frost on the surface of the outdoor heat exchanger is discontinuously removed, thereby keeping stable operation of the system.

The invention provides an intelligent defrosting method of a variable frequency air conditioner. The intelligent defrosting method comprises the following steps that S1, the air conditioner is turnedon for heating; S2, whether a pre-defrosting condition of the air conditioner is met or not is judged, and if yes, a pre-defrosting stage is entered; S3, the air conditioner changes a preset temperature of heating to a preset pre-defrosting temperature, and heating is continued; S4, whether a defrosting condition of the air conditioner is met or not is judged, and if yes, a defrosting stage is entered; and S5, defrosting is carried out on the air conditioner, whether a defrosting end condition is met or not is judged, and if yes, the defrosting process is ended. According to the method, when the air conditioner is not frosted, or the frosting condition is light and not sufficient to start frosting, the pre-defrosting judgment is carried out firstly and then the pre-defrosting process is carried out, and the indoor temperature before defrosting is improved; and then defrosting is performed after the defrosting starting condition is met, the defrosting speed is increased, the time required for defrosting is shortened, the defrosting efficiency of the air conditioner is improved, and the indoor temperature is prevented from excessively falling, the fluctuation range of indoor temperature before and after defrosting is reduced, and the comfort degree of the user is improved.

The invention provides a freezing and unfreezing integrated cabinet which comprises an incubator body and closed containers. The incubator body comprises a freezing chamber and an unfreezing chamber,and box-type frameworks are fixed in the freezing chamber and the unfreezing chamber correspondingly. Sealing plates are fixed on the upper and lower portions and the front and rear portions of each framework. An air exhaust channel plate is fixed to the left side of each framework, and an air return channel plate is fixed to the right side of the framework. The closed containers are in a flat shape and can be erected in the frameworks of the freezing chamber and the unfreezing chamber in a layered mode. Heat conduction fins are welded or riveted on the upper surface and the lower surface of each closed container in rows. One end of a channel formed by a gap between every two adjacent rows of heat conduction fins is aligned at a corresponding air exhaust hole of the corresponding air exhaust channel plate, and the other end of each channel is aligned at a corresponding air return hole of the corresponding air return channel plate; the air exhaust channel plates are provided with the air exhaust holes; the bottom of the framework in the freezing chamber is provided with a cold air generating device; and the bottom of the framework in the unfreezing chamber is provided with a cold and hot airflow generating device. According to the freezing and unfreezing integrated cabinet, the freezing speed and the unfreezing speed are high, breeding of microorganisms can be effectively restrained, the quality of food is better ensured, and moreover, resources can be greatly saved. The invention further provides a method for freezing and unfreezing meat by adopting the integrated cabinet.

The invention provides a control method and a device of an air conditioner system with an R290 refrigerant. The method comprises that a current working state of the air conditioner system is acquired; when the air conditioner system starts a heating function, whether an air conditioner fails during heating starting is detected according to an outdoor environmental temperature, operational frequency of a compressor, current of an outdoor unit and a wind shift state of the air conditioner, and when a failure appears, a failure code is displayed in an indoor unit and the air conditioner is shut down; when the air conditioner system starts a defrosting mode, whether defrosting is completed is judged according to the compressor frequency, the current of the outdoor unit and defrosting time during the defrosting; and when the defrosting is uncompleted, temperature of a condenser coil is detected, and the air conditioner is controlled to start a compulsory heating mode when the temperature of the condenser coil exceeds a preset temperature. Through control realized by the control method and the device of the air conditioner system with the R290 refrigerant provided by the invention, oil blocking can be effectively avoided, and the problem that a motor is burnt due to excessive heating caused by the oil blocking in the compressor can be prevented.

The invention discloses a multifunctional freezing, fresh-keeping and unfreezing storehouse used for solving the problems that nutrients of food are seriously lost in the freezing and unfreezing processes and the quality of the food is low. The multifunctional freezing, fresh-keeping and unfreezing storehouse comprises a warehouse body and a freezing and unfreezing device installed in the warehouse body. A shelf where food is placed is arranged inside the warehouse body. The freezing and unfreezing device comprises a refrigerating device, a steam heating device and an electric field device, wherein the refrigerating device is used for generating cold air to reduce the temperature in the storehouse body, the steam heating device is used for increasing the temperature and humidity in the storehouse body, and the electric field device is used for generating an electric field so that the food on the shelf can be in an electric field environment. In the freezing process, the refrigerating device and the electric field device are started so that the food on the shelf can be in a low temperature and electric field environment to be cooled and frozen; in the unfreezing process, the steam heating device and the electric field device are started so that the food on the shelf can be in a high temperature and electric field environment to be heated, moisturized and unfrozen, wherein the electric field intensity set in the freezing process is higher than that set in the unfreezing process.

The invention relates to an air conditioner and a defrosting method thereof. The air conditioner comprises a compressor, an outdoor heat exchanger and an indoor heat exchanger, wherein the compressor, the outdoor heat exchanger and the indoor heat exchanger are communicated through a pipeline. The air conditioner further comprises a first four-way valve and a second four-way valve. The first four-way valve comprises a port a1, a port b1, a port c1 and a port d1. The second four-way valve comprises a port a2, a port b2, a port c2 and a port d2. An outlet of the compressor is communicated with the port a1 through a pipeline, and an inlet of the compressor is communicated with the port c1 through a pipeline. The two ends of the outdoor heat exchanger are communicated with the port b2 and the port d2 through pipelines respectively. The two ends of the indoor heat exchanger are comminuted with the port b1 and the port c2 through pipelines respectively. The port d1 and the port a2 are communicated through a pipeline. Through control over on-off of the two four-way valves, switching between a heating mode and a defrosting mode is achieved, so that the defrosting speed is increased, the defrosting effect is improved, and large fluctuation of the room temperature is avoided.

The invention provides a defrosting method of a variable-frequency air source heat pump unit. The defrosting method comprises the following steps that when a defrosting condition is reached, a compressor is reduced to the lowest frequency and kept for 5 seconds, a defrosting mode is started, the frequency of the compressor is increased to the defrosting frequency, the expansion opening degree is adjusted to the defrosting opening degree, then the defrosting frequency is reduced by 5Hz every 30 seconds, the defrosting opening degree is reduced by 4%, and the adjustment is stopped until the frequency is reduced to the defrosting lower limit frequency; and the air exchange temperature, the unit high-pressure value and the defrosting duration are monitored, when any one of the three parametersexceeds a set value, the unit exits the defrosting mode, the frequency of the compressor is reduced to the lowest frequency and kept for 5 seconds, a fan is started and waits for 5 seconds, and the unit is switched back to normal heating. The method can reduce the defrosting switching impact of the air source heat pump, improves the unit safety, and reduces the noise. Meanwhile, the real-time matching of the defrosting heat demand and the unit heat supply can be kept, the total defrosting time is shortened, and the defrosting energy consumption is reduced.

The invention provides a non-stop defrosting system and an air-conditioner. The non-stop defrosting system comprises a compressor, a first four-way valve, a second four-way valve, a first three-way valve, a second three-way valve, a first outdoor heat exchanger, a second outdoor heat exchanger, an indoor heat exchanger, a first throttling device and a second throttling device. According to the technical scheme, each outdoor heat exchanger is composed of two parts and the flowing direction of refrigerating fluid can be controlled through one four-way valve and one three-way valve; after the outdoor heat exchangers are frosted, compressor non-stop and indoor unit ceaseless heating can be achieved through the alternate defrosting mode of the two outdoor heat exchangers, heating operation efficiency of the air-conditioner is greatly improved, and thus the heating comfort of the air-conditioner is increased; and meanwhile, the problem of frequent start and stop of main electric parts like the compressor is effectively avoided, the defrosting speed is increased, and therefore the effect of reducing energy consumption is achieved, the failure rate of the main electric parts like the compressor can be better lowered, and user experience is improved.

The invention provides a defrosting control method for a variable-capacity compressor system. The variable-capacity compressor system comprises a variable-capacity compressor, a four-way valve, as well as a first control tube and a second control tube which are selectively connected with a variable-capacity control port of the variable-capacity compressor through a variable-capacity switchover valve. The method comprises the step of after detecting and knowing that the variable-capacity compressor system runs in a defrosting manner and first preset conditions are reached, controlling the variable-capacity switchover valve to connect the first control tube or the second control tube with the variable-capacity control port, so as to enable the variable-capacity compressor to work in a first defrosting mode with a plurality of working cylinders. According to the defrosting control method for the variable-capacity compressor system, which is provided by the invention, after the defrosting running is completed and the first preset conditions are reached, the variable-capacity switchover valve is controlled to introduce a high pressure, thus the variable-capacity compressor works in the first defrosting mode with the plurality of working cylinders, and then a refrigerant circulation quantity is increased, a defrosting speed is increased, and the great lowering of an indoor environment temperature due to a too long defrosting time is avoided.

The invention discloses an air conditioner and a defrosting system thereof. The defrosting system comprises an enthalpy increasing compressor, an outdoor heat exchanger, an indoor heat exchanger and an economizer unit; the enthalpy increasing compressor comprises a medium-pressure chamber and an enthalpy nozzle which communicates with the medium-pressure chamber; an outlet end of the outdoor heat exchanger is connected with a flow dividing capillary tube and a defrosting liquid accumulation tube in parallel; the economizer unit is provided with a first flow channel and a second flow channel; a first end of the first flow channel selectively communicates with one of the flow dividing capillary tube and the defrosting liquid accumulation tube via a first pipeline system; a second end of the first flow channel communicates with the indoor heat exchanger via a main pipeline; the first end of the second flow channel is connected with the main pipeline via an auxiliary pipeline; the second end of the second flow channel is connected with the enthalpy nozzle of the enthalpy increasing compressor via a second pipeline system; the second pipeline system is provided with a valve device; and the auxiliary pipeline is provided with a throttling and pressure reducing component. By the arrangement, the defrosting system of the air conditioner disclosed by the invention can shorten the defrosting time and satisfy the comfort requirement of a user.

The invention discloses refrigeration equipment, relates to the technical field of refrigeration, and aims to reduce the temperature fluctuation amplitude of a refrigeration chamber and reduce the defrosting energy consumption in the process of defrosting an evaporator by utilizing a defrosting device. The refrigeration equipment comprises the refrigeration chamber and a refrigeration assembly; the refrigeration assembly comprises an evaporator assembly and an air duct assembly; the evaporator assembly comprises an evaporator bin, an evaporator located in the evaporator bin and the defrostingdevice; the air duct assembly comprises a draught fan and an air cavity used for communicating the evaporator bin with the refrigeration chamber, an air inlet of the draught fan is located in an air inlet of the air cavity, and an air outlet of the draught fan is in communication with the air cavity; and the air duct assembly further comprises a controllable shielding unit arranged at the air inlet of the draught fan, and the controllable shielding unit opens or closes the air inlet of the draught fan in a controlled state. The refrigeration equipment is used for food preservation.

The invention relates to an air conditioner, in particular to the improvement on a defrosting function of the air conditioner. The air conditioner comprises an outdoor unit heat exchanger, a throttling device and an indoor unit heat exchanger which are orderly connected through connecting pipes, a compressor, a compressor liquid storage tank connected with the compressor, and a four-way valve, wherein an inlet pipe of the outdoor unit heat exchanger, an output end of the indoor unit heat exchanger, an inlet of the compressor liquid storage tank and an exhaust pipe of the compressor are connected to four valve ports of the four-way valve respectively. In addition, the connecting pipe between the outdoor unit heat exchanger and the throttling device is also connected with the compressor liquid storage tank through an electromagnetic valve, and the electromagnetic valve is only connected during the defrosting of the air conditioner. A refrigerant with relatively higher general temperature does not enter the indoor unit heat exchanger, but directly returns to the compressor for air return through the electromagnetic valve, which makes the exhaust temperature of the compressor remarkably improved further to ensure that the condensing temperature is remarkably improved, the defrosting speed is remarkably improved and the defrosting time is greatly shortened.

The invention provides a multi-split air conditioner defrosting control method and an air conditioner multi-split air conditioner system. The multi-split air conditioner defrosting control method is applied to the air conditioner multi-split air conditioner system. The air conditioner multi-split air conditioner system comprises a plurality of indoor units. The multi-split air conditioner defrosting control method comprises the steps that when a defrosting instruction is received, the accumulated running time of each indoor unit is obtained; according to the accumulated running time, the multiple indoor units are divided into the common indoor units and the target indoor units; and when the preset time duration is reached after the defrosting instruction is received, inner draught fans ofthe common indoor units are controlled to be stopped, and inner draught fans of the target indoor units are controlled to run at the high wind gear till defrosting is over. In the defrosting period, except a compressor acts and provides the defrosting heat, in the high-wind-gear running process of the target indoor units, heat can be absorbed from the corresponding installing indoor space, heat energy is provided for defrosting, accordingly, the defrosting speed is increased, and bad experience brought to users due to the too long defrosting time is avoided.

The invention provides a frozen food material efficient unfreezing cabinet. The unfreezing cabinet comprises a cabinet body. The cabinet body comprises a thermally-insulating box body and closed containers. A box-form frame is fixed into the thermally-insulating box body. An air outlet channel plate and an air return channel plate are fixed to the left side and the right side of the frame. The closed containers are in flat shapes and are arranged in the frame in a layered and erected manner. Rows of heat conduction fins are welded or riveted to the upper surfaces and the lower surfaces of theclosed containers. One end of a channel formed by a gap between every two adjacent heat conduction fin rows is aligned with an air outlet of the air outlet channel plate, and the other end of the channel formed by the gap between every two adjacent heat conduction fin rows is aligned with an air return hole of the air return channel plate. The bottom of the frame is provided with a cold and hot airflow generating device. The device comprises a forced convection fan, an electric heater and an evaporator. The evaporator is electrically connected with a refrigerating unit, wherein the refrigerating unit is arranged on the lower portion of the cabinet body and located outside the thermally-insulating box body. The unfreezing cabinet is high in unfreezing speed; in addition, after food materials are unfrozen by the unfreezing cabinet, nutrition loss and air pollution can be avoided, and quality of the food materials is guaranteed. The invention further provides a method for unfreezing frozen meat through the unfreezing cabinet.

The invention discloses a conduction-variable vacuum water catching device and belongs to the technical field of vacuum water catching. The vacuum water catching device comprises a water catcher, a refrigerating system and an auxiliary unit; a condenser tube shortens gradually in length in the direction from the gas inlet to the gas outlet, so that the conduction capacity of the water catcher varies from large to small when gas flows in the water catcher; a casing adopts a modified taper, and circular and round baffle plates are adopted for the inside of the taper casing, therefore the conduction capacity of the water catcher also varies from large to small when the gas flows in the water catcher, moreover, the efficiency for catching steam is improved, and the refrigerating capacity consumption is reduced. As the device adopts cooling water circulation for defrosting or deicing, reuse of waste water as well as heat energy is achieved, and purposes of high efficiency, energy saving and emission reduction are achieved; the device is simple in structure, low in construction cost, convenience in use and maintenance, and large in application range, and can be used wherever the steam is required to be caught.

The invention discloses a control method of a dehumidifier. The control method comprises the following steps: after the dehumidifier enters a defrosting mode, controlling a compressor in the dehumidifier to keep a continuous running state, and controlling a fan in the dehumidifier to be in an off state; when the off-state time of the fan reaches a first time, controlling the compressor to be in the off state and controlling the fan to be in an on state; when the dehumidifier meets a defrosting-exiting condition, controlling the dehumidifier to exit from the defrosting mode. When the control method of the dehumidifier controls the defrosting of the dehumidifier, the defrosting speed of the dehumidifier can be increased and the dehumidifying amount of the dehumidifier under a low-temperature or medium-temperature working condition is enhanced, so that the dehumidifying effect of the dehumidifier is significant. The invention further discloses a control device of the dehumidifier and the dehumidifier.

The invention provides an air conditioning system and a control method thereof. The system involves an outdoor unit and at least one indoor unit; the outdoor unit comprises a compressor, an outdoor heat exchanger, a first throttling device, a pressure adjusting module and a cold accumulation module, wherein the pressure adjusting module comprises a second four-way valve, a one-way valve and a second throttling device, the first end of the second four-way valve is connected with a high-pressure air pipe, the second end of the second four-way valve is connected with an air return port of the compressor, the third end of the second four-way valve is connected with a low-pressure air pipe through the one-way valve, and the fourth end of the second four-way valve is connected with the low-pressure air pipe through the second throttling device; and the cold accumulation module comprises a cold accumulator, a cold accumulation throttling device, a first control valve and a second control valve, wherein the first end of the cold accumulator is connected between the outdoor heat exchanger and the first throttling device through the cold accumulation throttling device, the second end of thecold accumulator is connected with the fourth end of the second four-way valve through the first control valve, and the second end of the cold accumulator is also connected with a high-pressure liquidpipe through the second control valve.

The invention provides an air conditioner, a defrosting method thereof and a readable storage medium. A branch comprising a refrigerant heat exchanger is additionally arranged between an outdoor heat exchanger and an air return port of a compressor, and during defrosting, a refrigerant subjected to heat exchange through the outdoor heat exchanger is subjected to secondary heat exchange through the refrigerant heat exchanger to obtain superheated air, then the superheated air flows back to the compressor, accordingly, the air suction amount of the compressor can be increased, the acting amount of the compressor is increased, the exhaust temperature of the compressor is increased, the defrosting speed of the air conditioner is increased, the technical problem that the indoor temperature seriously fluctuates due to long defrosting time of the air conditioner is solved, the indoor temperature can be kept stable during defrosting of the air conditioner, and the thermal comfort experience of users is improved.

The invention discloses a refrigerating system and a refrigerator with the refrigerating system. The refrigerating system comprises a freezing compressor, a freezing condenser, a freezing evaporator, a refrigeration compressor, a flow direction controller, a refrigeration condenser, a condensing heater, a refrigeration evaporator and a refrigeration fan, wherein an inlet of the flow direction controller is connected with an inlet of the refrigeration compressor, the inlet of the refrigeration condenser is connected with a first outlet of the flow direction controller; an inlet of the condensing heater is connected with a second outlet of the flow direction controller; an outlet of the condensing heater is connected with the inlet of the refrigeration condenser; the condensing heater is close to the freezing evaporator; an inlet of the refrigeration evaporator is connected with an outlet of the refrigeration condenser; an outlet of the refrigeration evaporator is connected with the inlet of the refrigeration compressor; and the refrigeration fan is matched with the refrigeration evaporator. The refrigerating system provided by the embodiment of the invention has the advantages of low energy consumption and the like.

The invention provides an air-conditioner defrosting control method and device, an air conditioner and a computer-readable storage medium. The defrosting control method comprises the following steps that when the air conditioner receives a defrosting signal, a four-way valve is controlled to reverse; an electrical auxiliary heating device is started, and a current set temperature Ts and a currentinner ring temperature Tin of the air conditioner are detected continuously; an inner motor is rotated reversely and operates at an initial speed N; and the speed of the inner motor is adjusted according to the detected set temperature and the detected inner ring temperature. According to the air-conditioner defrosting control method and device, the air conditioner and the computer-readable storage medium, defrosting can be accelerated, the indoor temperature is kept stable, and user experience is improved.

The invention provides a fixed-frequency air conditioner and a control method and device for an indoor draught fan thereof. The method comprises the steps of obtaining the current temperature of an indoor heat exchanger; detecting and identifying that the current temperature is less than or equal to a shutdown protection temperature, and continuously operating for a preset time; and according to the current temperature, controlling the rotating speed of the indoor draught fan to be adjusted, so that the defrosting period of the air conditioner is effectively shortened, the downtime of a compressor is shortened, the refrigerating effect is improved, and the refrigerating experience of users is guaranteed.

The invention belongs to the technical field of air conditioners, and provides a self-cleaning control method for an air conditioner. The method aims to solve the problem that the normal experience ofthe user is influenced due to long self-cleaning time caused by the fact that an existing self-cleaning control mode of the air conditioner is generally slow in frosting speed. The air conditioner comprises a refrigerant circulation system and a solution circulation system composed of an indoor solution film, an outdoor solution film, a liquid pump and a liquid storage box. The self-cleaning control method comprises the following steps that under a heating working condition, a compressor undergoes frequency reduction, a four-way valve is reversed, the opening degree of an electronic expansionvalve is reduced and the rotating speed of the liquid pump is improved, so that an indoor heat exchanger frosted; after the indoor heat exchanger is frosted, the electronic expansion valve is shut off first, and then an electromagnetic valve at the low pressure side of the compressor is shut off after preset time; and the indoor heat exchanger is heated, so that the indoor heat exchanger is subjected to defrosting cleaning. According to the self-cleaning control method for the air conditioner, the self-cleaning efficiency of the indoor heat exchanger can be improved, and the user experience is improved.

The invention relates to the technical field of refrigerators, and discloses a method for defrosting an evaporator of a refrigerator. The evaporator comprises a heat dissipation element, a refrigerant pipe and an electromagnetic heating element, wherein the refrigerant pipe is arranged on the heat dissipation element in a penetrating mode, the electromagnetic heating element comprises an electromagnetic heating pipe and a coil arranged outside the electromagnetic heating pipe, the electromagnetic heating pipe communicates with the refrigerant pipe, and the electromagnetic heating element is arranged between a refrigerant inlet and a refrigerant outlet of the evaporator. The method comprises the steps of acquiring the accumulated working time of a compressor; and when the accumulated working time is longer than or equal to the first time, starting the electromagnetic heating element of the evaporator, and defrosting the evaporator. According to the method provided by an embodiment of the invention, the defrosting speed of the evaporator is increased. The invention further discloses a device for defrosting the evaporator of the refrigerator and the refrigerator.

The invention provides an air conditioner defrosting control method, a control device and an air conditioner. The control method comprises the steps of after the relative air humidity RH and the outdoor unit coil temperature T meet the first preset conditions, enabling the air conditioner to enter a defrosting mode; enabling a compressor to defrost at high frequency, and converting the compressorto defrost at low frequency after the outdoor unit coil temperature T meets the second preset condition; and when the outdoor unit coil temperature T meets the third preset condition, exiting the defrosting mode. By reasonably controlling the frequency of the compressor, not only can the defrosting speed be accelerated, but also a defrosting effect can be guaranteed.

The invention discloses a heat pump system which comprises a compressor, a four-way valve, an indoor machine, an outdoor machine, a throttling device and a first on-off valve. A first valve port of the four-way valve is connected with a compressor outlet, and a third valve port of the four-way valve is connected with a compressor inlet. The indoor machine is provided with a first indoor machine opening and a second indoor machine opening, the outdoor machine is provided with a first outdoor machine opening and a second outdoor machine opening, the first indoor machine opening is connected with a second valve port, and the first outdoor machine opening is connected with a fourth valve port. A first opening of the throttling device is connected with the second indoor machine opening, and a second opening of the throttling device is connected with the second outdoor machine opening. A first port of the first on-off valve is connected with the fourth valve port and the first outdoor machine opening, and a second port of the first on-off valve is connected with the second outdoor machine opening and the second opening of the throttling device. The heat pump system has the advantages of being fast in defrosting, small in heating fluctuation, high in efficiency and the like.