84results about How to "Reduce the frequency of defrosting" patented technology

The invention discloses an air conditioner and a control method thereof. The air conditioner comprises a compressor, a detection device and a controller. The detection device is used for acquiring the relative humidity of outdoor air. The controller is connected with the compressor and the detection device, and the controller is used for determining whether the relative humidity of the outdoor air is larger than the first preset relative humidity before the air conditioner works in a defrosting mode, and reducing the operation frequency of the compressor if the relative humidity of the outdoor air is larger than the first preset relative humidity. The air conditioner provided by the embodiment of the invention can reduce the frosting speed of a heat exchanger of an outdoor unit, so as to reduce frosting times of the air conditioner, prolong the time of heating operation, raise the continuity of the heating operation, and raise the users' comfortableness.

The invention discloses an exhausting assisted method for controlling an electronic expansion valve. The method is characterized by comprising the following steps: calculating an actual opening degree of the electronic expansion valve by a heat pump controller through a back temperature and a coiled pipe temperature of a detection system and controlling the electronic expansion valve; and at a time period 3-10 minutes after a compressor is opened and after the compressor is opened for 10 minutes, adjusting the electronic expansion valve by different manners according to a target exhausting temperature and an actually-measured exhausting temperature. According to the method, the opening degree is automatically adjusted in an assisted manner according to the exhausting temperature on the basis of previous superheat degree control so that a heat pump system can work efficiently all the time, and the problem that the electronic expansion valve cannot do corresponding movement when a working condition of a set is changed is solved; the setting of time intervals is adjusted so that the defrosting time of the set is effectively prolonged and the defrosting efficiency of the set is reduced; the efficient operation of the heat pump system is facilitated. The exhausting assisted method for controlling the electronic expansion valve, disclosed by the invention, can be widely applied to the field of heat pump control.

The invention discloses an air heat pump low-temperature heating bypass system, wherein, there is a bypass electromagnetic valve in tube between the gas outlet and the reflux opening of compressor; a temperature and a pressure sensor at the reflux tube of compressor; the bypass electromagnetic control valve, temperature sensor, pressure sensor and the electromagnetic valve controller are electrically connected. The invention checks the pressure and temperature of reflux tube of compressor in heating mode, the electromagnetic valve controller via the pressure and temperature to control the switch frequency of electromagnetic valve, control the reflux pressure and overheat degree, to make the compressor and refrigerator work normally in low-temperature and ultra-low-temperature condition. And the invention engages the coolant reflux with area of heat exchanger, without refluxing the coolant and damaging the compressor.

The invention provides a control method of an air conditioner, a control device of the air conditioner and the air conditioner. The air conditioner comprises an outdoor heat exchanger. The outdoor heat exchanger comprises a coiler, wherein a heating element is arranged in the coiler. The control method of the air conditioner comprises the steps that the temperature of the coiler is detected once every preset time interval a, the temperature obtained during the ith detection is recorded as T, and when i is larger than b, the heating element is controlled to switched on or off according to the difference value between T<i+b>-T and the Ti-T<i-b>, wherein the unit of the preset time interval a is minute, a is a positive number, the initial value of i is 1, i is an integer larger than or equal to 1, and b is a natural number larger than or equal to 2. According to the scheme, the coiler can be preheated before defrosting through a heating assembly, so that frosting is avoided, and the defrosting speed is increased in the defrosting process; and after defrosting of the air conditioner is ended, the coiler continues being heated so that thawed ice water can be completely discharged, and the possibility that the ice water is frosted again is reduced.

The invention provides a control method of a heat pump system. The heat pump system comprises a control device and a first temperature detecting device for detecting the real-time temperature of an outdoor heat exchanger of the heat pump system; and whether the delayed defrosting action is executed is judged by the control device according to the relation between the dew-point temperature Td of the environment where the outdoor heat exchanger is located and the real-time temperature T, detected by the first temperature detecting device, of the outdoor heat exchanger. The invention further provides the heat pump system controlled with the method and an air conditioner comprising the heat pump system. The heat pump system is controlled with the control method during heating operation of theheat pump system in winter, whether the delayed defrosting action is executed can be judged by the aid of the dew-point temperature and the real-time temperature of the outdoor heat exchanger, thus the time when the defrosting mode of the heat pump system is enabled can be delayed, then the defrosting frequency can be reduced effectively, the heating energy efficiency of the heat pump system can be improved, and the use comfort level for a user can be increased.

The invention provides a frosting control method and device. The method includes the steps that the outdoor unit environment temperature of an air conditioner and the defrosting temperature of the air conditioner are obtained; and the opening degree of an electronic expansion valve is helped to be controlled according to the difference value between the outdoor unit environment temperature and the defrosting temperature. By means of the above manner, the problem that the evaporation temperature and the pressure are too low during heating of an existing air conditioner system, and consequently the surface of an outdoor unit heat exchanger is frosted is solved; and the technical effects that the heating capability keeps not attenuated or little attenuated for a long time, the defrosting times are reduced, and the heating time is prolonged are achieved.

The invention discloses an air-cooling heat pump using the excess heat of a compressor for frost prevention, comprising a refrigeration agent loop, a flat panel loop heat pipe and an outdoor unit fan; wherein the refrigeration agent loop is formed by the compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger; an exhaust pipe of the compressor is connected with an inlet of the indoor heat exchanger, and an outlet of the indoor heat exchanger is connected with an inlet of the throttling device; an outlet of the throttling device is connected with an inlet of the outdoor heat exchanger, and an outlet of the outdoor heat exchanger is connected with an air suction pipe of the compressor; the flat panel loop heat pipe is formed by a metal evaporation cavity, a condensation part, a vapor phase metal pipeline, a liquid phase metal pipeline and a metal heat dissipation fin; when in heating operation in the winter, the air-cooling heat pump clings to the metal evaporation cavity on the top of the compressor to be heated under the condition of needing no extra power, a working medium inside the cavity is evaporated and vaporized, and the heat is brought to the condensation part and used for heating the air at the inlet of the outdoor heat exchanger, so that frost formation can be prevented.

The invention discloses an air conditioner and a control method thereof. The air conditioner comprises an outdoor air blower, a detecting device and a controller, wherein the detecting device is used for acquiring the relative humidity of outdoor air. The controller is connected with the outdoor air blower and the detecting device, and used for judging whether the relative humidity of outdoor air is higher than the first preset relative humidity or not before the air conditioner enters a defrosting mode and increasing the rotation speed of the outdoor air blower when the relative humidity of outdoor air is higher than the first preset relative humidity. The air conditioner has the advantages that the frosting speed of the heat exchanger of the outdoor air blower can be delayed, the defrosting frequency of the air conditioner is reduced, and the heating operation time is prolonged, so that the heating continuity of the air conditioner is improved, and the comfort of a user is improved.

The invention belongs to the technical field of air conditioners, in particular to a defrosting control method of an air conditioner. In order to more accurately judge defrosting timing, the defrosting control method of the air conditioner, provided by the invention comprises the following steps: detecting a real-time current value of an outdoor fan under the circumstance that the air conditioneris in a heating condition; calculating the attenuation degree of the real-time current value of the outdoor fan; and judging whether the air conditioner is enabled to enter a defrosting mode or not according to the attenuation degree. As the current magnitude of the outdoor fan can be correspondingly changed along with the frosting degree of an outdoor coil, and the attenuation degree of the real-time current value of the outdoor fan is capable of accurately reflecting the change condition of the current of the outdoor fan, frost quantity of the outdoor coil can be more accurately reflected according to the attenuation degree of the real-time current value of the outdoor fan, and therefore, the defrosting timing is selected more accurately, limitations during judging the frosting degree byadopting the temperature of the outdoor coil in the prior art can be effectively eliminated, the defrosting time of the air conditioner is reduced, and the user experience is promoted.

The invention belongs to the technical field of air-conditioners, and particularly relates to an air-conditioner defrosting control method. In order to more accurately judge the opportunity for entering the defrosting mode, the air-conditioner defrosting control method comprises the steps that under the condition that an air-conditioner is in the heating working condition, current average values of an outdoor draught fan are obtained every preset time; the current average values of the outdoor draught fan are compared with a standard current average value; and whether the air-conditioner enters the defrosting mode or not is judged according to the comparative result, wherein the standard current average value is the current average value, obtained at the first time, of the outdoor draughtfan after the air-conditioner starts to run this time. As the current average values of the outdoor draught fan can more accurately reflect current changes of the outdoor draught fan, misjudging conditions generated by sudden changes of single current values can be effectively avoided, the frosting state of an outdoor coiler can be judged more reasonably, the defrosting opportunity can be selectedmore accurately, and the user experience is improved.

The invention provides an operation control method and device, an air conditioner, and a computer-readable storage medium. The operation control method comprises the following steps: in the heating mode, detecting specified operation parameters of a compressor at preset time intervals; when determining that the heating capacity is lowered according to the specified operation parameters, judging whether the operation frequency of the compressor is higher than or equal to the preset operation frequency; and adjusting operation parameters of specified parts of the air conditioner according to theoperation frequency judgement result, so as to reduce the number of defrosting operations in the heating mode. The specified operation parameters comprise at least one of the exhaust temperature of the compressor, the load current of the compressor, and the power of the compressor. Through the technical scheme, the compressor operation reliability and stability can be improved, the defrosting frequency can be reduced, the defrosting duration can be shortened, and the user experience can be effectively improved.

The invention relates to a heat pump air conditioner with better heating effect in low-temperature, which comprises a compressor, a four-way valve, indoor and outdoor heat exchangers, and main throat device, which are connected via tubes. Wherein, said compressor has a outlet and two inlets; a bypass tube is arranged at the front and back of main throat device to connect the second inlet of compressor. The invention comprises a steam ejection controller, which at least includes three sensors and one electric expansion valve, while the sensors are at the outlet and two inlets of compressor, and the electric expansion valve is on the by-pass tube. The invention detects the ejector pressure of compressor to control the ejected amount of refrigeration accurately, improve the heating effect and energy / efficiency ratio in lower temperature. it can accurately control the open degree of electric expansion valve, to reduce the vibration of indoor temperature.

The invention relates to a defrost control method of an air source heat pump system, and relates to the technical field of air conditioning refrigeration and heat pumps. The defrost control method comprises the steps of when a system runs and one unit reaches to a defrost condition, naming the unit as a unit a, and carrying out the following judgment: (i) when no unit is at a standby mode, enabling the unit a to enter a normal defrost mode; (ii) when the other unit is at a standby mode, naming the unit as a unit b; if the state of the unit b is not 'to be defrosted', closing the unit a, enabling the unit a to enter the standby mode, and meanwhile, enabling the unit b to start heating for running; and otherwise, keeping the unit a to be at a heating mode, and then carrying out correspondingcontrol; and (iii) when two and more that two units are at the standby mode, judging and selecting the units, naming the selected units as units b, and carrying out follow-up control according to thestep as shown in (ii). The method provided by the invention can be used for carrying out defrost control on a multiple air source heat pump unit combined operation system, and effectively solves various problems caused by defrosting of a current air source heat pump system through adjusting a defrost control logic.

The invention belongs to the technical field of air conditioners and particularly relates to an air conditioner defrosting control method. To prevent the situation that the room temperature fluctuation is too large during defrosting, the air conditioner defrosting control method comprises the steps that after an air conditioner begins to run in a heating manner, the maximum heating capacity Qmax of the air conditioner is worked out; after the air conditioner reaches the maximum heating capacity, the real-time heating capacity Q of the air conditioner is calculated; and Q and Qmax are compared,and whether the air conditioner needs to go into a defrosting pattern or not is judged according to a comparative effect, wherein Qmax=(Q1+Q2+...Qm) / m, Qm is the heating capacity, acquired every a first preset time, of the air conditioner after the heating capacity of the air conditioner is not increased any more from the heating beginning of the air conditioner, when Qm / Qm-1 is smaller than a set value, calculation of the value of Qm is stopped, and Qm-1 is the air conditioner heating capacity calculated last time of Qm. According to the air conditioner defrosting control method, whether theair conditioner needs to go into the defrosting pattern or not is judged according to the change of the heating capacity, and therefore the effect on the indoor temperature in the defrosting processis reduced to the maximum extent, and the indoor temperature cannot fluctuate greatly.

The invention discloses a defrosting system for a heat pump, which comprises a compressor, a four-way valve, a gas-liquid separator, an outdoor heat exchanger, a thermostatic expansion valve, an indoor heat exchanger and a two-way magnetic valve which are connected through pipes as below: the compressor is connected with the port D of the four-way valve; the port C of the four-way valve is connected with the outdoor heat exchanger and one end of the two-way magnetic valve; the other end of the two-way magnetic valve is connected with the outdoor heat exchanger and the indoor heat exchanger; two ends of the thermostatic expansion valve are connected with the outdoor heat exchanger and the indoor heat exchanger in a one-to-one correspondence manner; the outdoor heat exchanger is connected with the port E of the four-way valve; the port S of the four-way valve is connected with one end of the gas-liquid separator; and the other end of the gas-liquid separator is connected with the compressor. The defrosting system for the heat pump has the characteristic of being less susceptible to frosting in winter heating.

The invention belongs to the technical field of air conditioners, and in particular relates to a defrosting control method for an air conditioner. In order to judge the 0pportunity of entering a defrosting mode more accurately, the invention provides the defrosting control method. The defrosting control method comprises the following steps: detecting the real time current value of an outdoor fan and the real time temperature value of an outdoor coil when the air conditioner is in a heating working condition; comparing the real time current value of the outdoor fan with a selected standard current value to acquire a first comparison result; comparing the real time temperature value of the outdoor coil with a selected standard temperature value to acquire a second comparison result; and judging whether the air conditioner enters the defrosting mode or not according to the first comparison result and the second comparison result. The defrosting control method provided by the invention canreflect the frosting amount of the outdoor coil so as to select the defrosting opportunity more accurately and eliminate the boundedness of judging the frosting degree according to the temperature ofthe outdoor coil in the prior art effectively, so that the defrosting number of times of the air conditioner is reduced, and the user experience is enhanced.

A defrosting method for an air conditioning unit comprises steps as follows: various influence factors affecting defrosting operations of an outdoor unit are detected, and defrosting judgment is performed at least once according to the various influence factors as follows: judgment is performed according to the magnitude relation of the frosting degree of the outdoor unit and a preset degree threshold value, and / or judgment is performed according to the magnitude relation of the defrosting interval between the current time and the previous defrosting time of the outdoor unit and a preset interval threshold value; according to judgment results, whether the outdoor unit performs the defrosting operations is determined. According to the method and the device, defrosting judgment is performed by the aid of the frosting degree and the defrosting interval, the device is suitable for various regions with different environments, and the defrosting effect is guaranteed; and in addition, on the basis that the defrosting effect is guaranteed, defrosting times can be effectively reduced, and the advantage of energy saving can be realized.

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner defrosting control method. The air conditioner defrosting control method is used for preventing the room temperature fluctuation from being excessively large during defrosting. The defrosting control method includes the following steps that after an air conditioner starts the heating operation, an average value Q<n> of the heating capacity of the air conditioner in a time period t<d> is calculated at an interval of the time period t<d> as a reference value; if the air conditioner running time t is larger than t<d>, the real-time heating capacity Q of the air conditioner is calculated; and Q and Q<n> are compared, and according to the comparison result, whether the air conditioner is enabled to enter into defrosting or not is judged, wherein Q<n> is the last updated reference value of the air conditioner. The air conditioner defrosting control method utilizes the change of the heating capacity of the air conditioner to determine whether to enable the air conditioner to enter into a defrosting mode, thereby minimizing the influence on the indoor temperature in the defrosting process; and the indoor temperature does not fluctuate greatly.

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner defrosting control method. In order to prevent large fluctuation of the temperature ina room during defrosting, the air conditioner defrosting control method comprises the steps that the maximum heating capacity Qmax of an air conditioner is calculated after the air conditioner beginsto heat; after the air conditioner reaches the maximum heating capacity, the real-time heating capacity Q of the air conditioner is calculated; and Q and Qmax are compared, and whether the air conditioner is made to enter into the defrosting mode is judged according to the comparison result, wherein Qmax=(Q1+Q2+...Qm) / m, Qm is the heating capacity, obtained every other first preset time, of the air conditioner after the air conditioner begins to heat until the heating capacity of the air conditioner is not increased, and when the Q(m-1)-Qm>the set value, the Qm is stopped to be calculated, andQ(m-1) is the heating capacity, obtained the last time of Qm, of the air conditioner. Whether the air conditioner enters into the defrosting mode or not is judged according to the changes of the heating capacity, the influence on the indoor temperature in the defrosting process is reduced to the greatest extent, and the indoor temperature does not greatly fluctuate.

The invention relates to a single-system air-cooling refrigerator defrosting recovery period control method and system and a refrigerator. The method comprises the following steps: starting a compressor and closing a refrigeration air door a first preset time t1 later after defrosting stops; opening the refrigeration air door after a second preset time t2 of refrigeration; when the temperature of a refrigeration chamber is lowered to a preset refrigeration temperature, closing the refrigeration air door; and when the temperature of a freezing chamber is lowered to a preset freezing temperature, stopping defrosting recovery control. According to the invention, the purpose of time-sharing control of refrigeration and freezing is achieved by controlling the opening / closing state of the refrigeration air door after defrosting; and after time control is over, both the refrigeration chamber and the freezing chamber are finally enabled to reach the preset temperatures by controlling the opening / closing state of the refrigeration air door. Through the control method provided by the invention, the defrosting recovery period is effectively shortened, power consumption in the defrosting recovery period is reduced, and refrigeration and freezing are recovered as soon as possible to a normal stable operation state.

The invention belongs to the technical field of air conditioner control, and discloses a defrosting control method, a controller, an air conditioner, a storage medium and a terminal. The defrosting control method comprises the steps of extracting operation time, power and evaporator inner pipe temperature as judging parameters, and monitoring a change rate of operation power is monitored. The heating operation time t1 refers to the stable operation heating time of the air conditioner; the accumulated heating operation time t2 refers to accumulated operation heating time of the air conditioner;once detection of the operation power PN is conducted every interval time t after the operation time t1 or t2 passes; a power change rate and preset power rates A and B are calculated in real time; the evaporator inner pipe temperature T of an inner pipe is collected through an indoor pipe temperature sensing bulb; and an inner pipe temperature T1 is preset, and whether a defrosting condition isentered or not is judged. According to the defrosting control method, the controller, the air conditioner, the storage medium and the terminal, whether the fixed-frequency air conditioner needs to bedefrosted or not can be accurately recognized; under the low-temperature and low-humidity conditions, frost is defrosted if exists, and defrosting is not conducted if no frost exists; the unnecessarydefrosting frequency is reduced; and therefore, the user experience is improved, and the product quality is improved.

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner defrosting control method to prevent excessive room temperature fluctuation during defrosting. The air conditioner defrosting control method comprises the following steps that during the heating operation process of an air conditioner, heating capacity of the air conditioner is calculated; the ratio of adjacent two times of heating capacity of the air conditioner is calculated based on the heating capacity; the attenuation degree of the ratio of the adjacent two times of heating capacity is calculated based on the ratio of adjacent two times of heating capacity; and whether the air conditioner is put into the defrosting mode is judged based on the attenuation degree. Whether theair conditioner is put into the defrosting mode is judged by using changes of the heating capacity of the air conditioner, and therefore influence on the indoor temperature can be reduced to the maximum extent during the defrosting process, and indoor temperature does not fluctuate greatly. Through the mode of judging whether the air conditioner is put into the defrosting mode based on the changes of the heating capacity, the defrosting times can be further reduced, defrosting frequency can be lowered, and use comfort of a user can be guaranteed meanwhile.

The invention discloses a control method for defrosting of an air energy heat pump judging a dewpoint. The control method includes the following steps that firstly, a defrosting judging period Dt is preset; secondly, a real-time dewpoint temperature T1 of the outside environment is judged, and temperature T2 of an evaporator coil pipe is detected; thirdly, if T2 is larger than 0 DEG C, a defrosting program of a set is not started; and if T2 is smaller than or equal to 0 DEG C, and delta t1 is delayed to start the defrosting program, wherein delta t1=k1 / (T1-T2); fourthly, when the temperature of the evaporator coil pipe reaches a set temperature T, defrosting of the set stops, wherein T is larger than 0 DEG C; fifthly, when the defrosting interval meets Dt, a real-time dewpoint temperatureT3 of the outside environment at the moment is judged again, temperature T4 of the evaporator coil pipe is acquired, and delayed correction time delta t2 is calculated, wherein delta t2=k2 / (T3-T4); and sixthly, after the defrosting interval is delayed by the set by delta t2, the steps from the first step to the fifth step are repeated, repeating is performed in this way, and defrosting control ismade to achieve an optimal effect.

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner defrosting control method. To more accurately judge the time for defrosting, the provided defrosting control method comprises the steps that under the circumstance that an air conditioner is in a heating work condition, the real-time current value of an outdoor draught fan and the real-time temperature value of an indoor coil pipe are detected; the real-time current value of the outdoor draught fan is compared with the selected first standard current value, the selected second standard current value and the selected third standard current value, and a first comparison result is obtained; the real-time temperature value of the indoor coil pipe is compared with the selected firststandard temperature value, the selected second standard temperature value and the selected third standard temperature value, and a second comparison result is obtained; and according to the first comparison result and the second comparison result, whether the air conditioner enters the defrosting mode or not is judged. By means of the air conditioner defrosting control method, the defrosting timecan be more accurately selected, the limitation that in the prior art, an outdoor coil pipe is adopted for judging the defrosting degree is effectively eliminated, the defrosting frequency of the airconditioner is reduced, and the user experience is improved.

The invention belongs to the technical field of air conditioners, and specifically relates to a defrosting control method for an air conditioner. In order to prevent excessive fluctuation of room temperature during defrosting, the invention provides the defrosting control method for the air conditioner, and the defrosting control method comprises the following steps of calculating the heating capacity of the air conditioner in the heating process of the air conditioner; calculating the ratio of two adjacent heating capacities of the air conditioner based on the heating capacity; and judging whether the air conditioner needs to enter the defrosting mode according to the ratio. According to the defrosting control method, whether the air conditioner needs to enter the defrosting mode is judged according to the change of the heating capacity of the air conditioner, so that the influence of the defrosting process on room temperature is reduced to the maximum extent, and indoor temperature does not fluctuate greatly. Moreover, through the method for judging whether to enter the defrosting mode according to the change of the heating capacity, the number of defrosting can be further reduced; and the defrosting frequency is reduced, and meanwhile the user comfort can be ensured.

The invention provides a heat exchanging device comprising a heat exchanger and a refrigerant flow direction changing unit, wherein the heat exchanger is provided with a first opening and a second opening; and the refrigerant flow direction changing unit is connected with the heat exchanger for changing the flow direction of a refrigerant in the heat exchanger. According to the heat exchanging device of the embodiment of the invention, for example, when used as an evaporator in a refrigerating system, the heat exchanging device can defrost through changing the flow direction of the refrigerant, reduce the reverse circulation defrosting time of the refrigerating system and even keep the temperature of cooled environment stable without using reverse circulation defrosting, and therefore, the refrigerating system can work more stably, and the efficiency of the refrigerating system is improved. The invention also provides a refrigerating system with the heat exchanging device.

The invention relates to the field of heat pump equipment and particularly relates to a heat pump water heater. Aiming at the problem that a heat pump water heater in a wet-cold region is difficult to be defrosted, the heat pump water heater provided by the invention is additionally provided with a second heater in a position opposite to an evaporator of an existing heat pump water heater, so that one part of hot water generated by the heat pump water heater exchanges heat with air which is to enter the evaporator in the second heater, so that the temperature of the air entering the evaporator is increased, and by virtue of reverse defrosting, the problem of frosting in winter in the wet-cold region can be effectively solved; furthermore, the heat pump water heater is low in cost and good in effect. The heat pump water heater provided by the invention can be widely applied to heating water systems in the wet-cold region in winter.

The invention provides a refrigerator with high energy-saving performance and capability of preventing storage chamber from being dry and reducing defrosting frequency and power consumption. The refrigerator comprises a storage chamber, a first evaporator (22), a second evaporator (23), a switching valve (25), a fan 13, a first air channel opening and closing device (11) and a second air channel opening and closing device (12), wherein the storage chamber is at least divided into a refrigerating chamber (3) and a freezing chamber (4); the first evaporator (22) is arranged in a cooling chamber (8); the cooling chamber (8) is connected with the refrigerating chamber (3) and the freezing chamber (4) via an air supply channel (9) and an air supply channel (10); the second evaporator (23) is arranged in the freezing chamber (4); the switching valve (25) is used for switching a refrigerant to flow to a refrigerant channel connected with the second evaporator (23); the fan (13) is used for enabling the air cooled by the first evaporator (22) to flow from the cooling chamber (8) to the refrigerating chamber (3) and the freezing chamber (4); the first air channel opening and closing device (11) is inserted into the air supply channel (9) connected with the refrigerating chamber (3); the second air channel opening and closing device (12) is inserted into the air supply channel (9) connected with the freezing chamber (4). The refrigerator is capable of preventing the refrigerating chamber (3) and the freezing chamber (4) from being dry and reducing defrosting frequency and power consumption.

The invention discloses an energy-saving facility for a dry air curtain blocking evaporator frosting cold storage, specifically comprising an air curtain air curtain machine and an isothermal dehumidifier; wherein the air curtain machine located outside the cold storage is called an external air curtain machine , used to block high-temperature and high-humidity air from flowing into the cold storage; the air curtain machine located inside the cold storage is called an internal air curtain machine, and the indoor part of the isothermal dehumidifier is also located inside the cold storage. The internal air curtain machine is used with an isothermal dehumidifier. In order to further block and absorb the hot and humid air in the flow field of the warehouse door; the air in the cold storage is first dehumidified through the isothermal dehumidifier, and then blown out by the internal air curtain machine and returned to the cold storage. The cold storage energy-saving facility of the present invention can absorb and remove the water vapor and excess water in the cold storage during defrosting, prevent and reduce the frosting of the evaporator in the cold storage, reduce the number of defrosting in the cold storage, and increase the COP value of the evaporator and the refrigeration system , so as to achieve the purpose of reducing the energy consumption of the cold storage and improving the energy efficiency of the cold storage.