84results about How to "Short defrosting time" patented technology

The invention relates to an air conditioner control method, and provides the air conditioner control method by using a booster heater to shorten defrosting time and cold air prevention time. The air conditioner control method in an indoor heating state comprises the following steps: driving the booster heater during the cold air prevention of an air conditioner, and judging whether temperature of an indoor heat exchanger is higher than a first set temperature, if yes, driving an indoor fan; if not, keeping halted state of the indoor fan until the temperature of the indoor heat exchanger is higher than the first set temperature; and setting an indoor unit into a refrigeration cycle during the defrosting of the air conditioner, turning off the indoor fan, and driving the booster heater. The booster heater is arranged below the indoor heat exchanger. The method aims at the air conditioner containing the electric booster heater, and the electric booster heater is started during the air conditioner heating operation, the cold air prevention and the defrosting so as to shorten the cold air prevention time and the defrosting time, and extends the usage of the booster heater.

The invention discloses a defrosting method for a heat-pump type air conditioner, which decides whether the defrosting operation mode, namely setting environment determination temperature t<1> and t<2> and three constants a, b and c, is carried out by combination of coil tube temperature T of an outdoor heat exchanger, outdoor temperature T, actual heating time H and set heating time h; under the following conditions, the unit starts the defrosting operation mode: 1. when T is less than or equal to t<1> and more than or equal to t<2>, if the coil tube temperature T of the outdoor heat exchanger meets the condition of T less than a, T plus c and H larger than h in a continuous M minutes, the unit starts to defrost; 2. when T is less than t<2>, if the coil tube temperature T of the outdoor heat exchanger meets the conditions of T less than b, T plus c and H larger than h in a continuous M minutes, the unit starts to defrost. The defrosting method has the advantages of shortening defrosting time, improving defrosting efficiency, leading to thorough defrosting and greatly improving heating efficiency.

The invention discloses a heat pump type vehicle air conditioner having a battery heat management function, which comprises a main refrigerant circulating loop configured to allow a refrigerant to flow in a sequence from a compressor, through a vehicle outside heat exchanger and an expansion valve, to a vehicle inside heat exchanger, or configured to allow the refrigerant to flow in a sequence from the compressor, through the vehicle inside the exchanger and the expansion valve, to the vehicle outside exchanger; and a defrosting loop configured to allow the refrigerant compressed by the compressor to sequentially flow through a defrosting throttle valve, the vehicle outside heat exchanger and a gas-liquid separator and then back into the compressor. The heat pump type vehicle air conditioner having the battery heat management function, provided by the invention, has a good defrosting effect with short defrosting time and low inside-vehicle temperature fluctuation, and can provide favorable comfort.

The heat-flash air conditioning and its method of defrosting and it is in characterized in that: in the indoor machine sets up a big power secondary electric hot device and the big power secondary electric hot device's electric heat power is 0.9 to 1.4 times to the system's standard cooling quantity. When it is defrosting keep the indoor cross flow flan running in low speed and at the same time open the big power secondary electric hot device with the circulate system in the work condition of cooling. The invention can make the heating quantity of system reached two times or more to the cooling quantity so it is satisfied the small cooling quantity and big heating quantity of the setting requirement of system especially it is suited to the southwest area with the lower temperature and the bigger moisture. During the process of defrosting the fluctuation of environment's temperature is small and the time of defrosting is shorter and the defrosting is more clearly and thoroughly.

The invention provides a hot air defrosting system for a refrigerator and a control method of the hot air defrosting system. The system comprises a defrosting branch. The defrosting branch is connected between an outlet of a compressor and an inlet of a freezing evaporator in parallel. The system further comprises a controller, a freezing chamber wall temperature sensor connected with the controller and arranged on the surface of the freezing chamber evaporator, a compressor suction temperature sensor arranged on the surface of a compressor suction pipeline, and a second two-position three-way valve arranged on an outlet of the freezing chamber evaporator. A first two-position three-way valve is also connected with the controller. The system further comprises a second capillary pipe, and the second capillary pipe is independently connected to the position behind the freezing evaporator and in front of a refrigerating evaporator in parallel through the second two-position three-way valve, or connected with the refrigerating evaporator in series and then connected to the position behind the freezing evaporator and in front of a liquid storage device in parallel through the second two-position three-way valve. The invention further provides the control method. By the adoption of the hot air defrosting system and the control method, the refrigerating evaporator of the refrigerator is complete in defrosting operation, defrosting energy consumption is low, defrosting time is short, and the temperature rise of a freezing room is small.

The invention discloses a multi-connected multi-functional heat pump type electric air-conditioning system and a working method thereof. The air-conditioning system comprises an electric compressor, an out-of-vehicle heat exchanger, a vapor-liquid separator, an in-vehicle heat exchanger, a battery cooler, a vehicle-mounted storage battery, a battery cooler water pump, an electronic expansion valve, an electromagnetic valve, a water tank, a low-temperature cooler water pump, two-position three-way valves, a low-temperature cooler, an out-of-vehicle heat exchanger fan and an in-vehicle heat exchanger fan. According to the air-conditioning system, the year-round operating work condition of an electric vehicle can be well dealt, the in-vehicle heat exchanger and the battery cooler can serve as an evaporator and a condenser according to the needs of the operating work condition, the out-of-vehicle heat exchanger can decide to serve as the evaporator or the condenser in an automatically-matched mode according to the heat load, and heating or cooling of a battery can also be met while the in-vehicle refrigerating or heating requirements are met.

The invention provides an air conditioning system which comprises a four-way valve, a compressor, an outdoor heat exchanger, an indoor heat exchanger, a throttle mechanism and a defrosting access, wherein the defrosting access comprises an electronic device, a microchannel heat exchanger, a first electromagnetic valve and a second electromagnetic valve. When the air conditioning system is in a defrosting mode, the compressor doesn't shut down, the four-way valve isn't reversed, and an indoor fan still blows hot air; the first electromagnetic valve is switched on, the second electromagnetic valve is switched off, a refrigerant in the throttle mechanism flows into the microchannel heat exchanger to absorb heat generated by heating of an outdoor electronic device, enters the outdoor heat exchanger for defrosting the outdoor heat exchanger to release heat and enters an air return interface of the compressor, a circulation is completed, and the defrosting is finished in a heating mode. According to the provided air conditioning system, the compressor is not required to shut down and the four-way valve is not required to be reversed during defrosting, the working reliability is high, the influence on working of a power grid is low, the comfort of air supply of an air conditioner is good, the defrosting time is short, and the energy consumption is low.

The invention relates to a defrosting and refrigerating system and a cold storage. The defrosting and refrigerating system comprises a compressor, a water disc defrosting pipe, an evaporator coil pipe and an air pressure difference switch. An outlet of the compressor is connected with an inlet of the evaporator coil pipe through a first branch and a second branch which are arranged in parallel. The first branch comprises a hot air by-pass pipe and the evaporator water disc defrosting pipe. The outlet of the compressor is connected with the inlet of the evaporator coil pipe through the hot air by-pass pipe and the evaporator water disc defrosting pipe sequentially. The hot air by-pass pipe is provided with a first control valve; and the second branch is provided with a second control valve. A defrosting control signal is generated when the pressure difference, between pressure obtained at an air pressure sampling port of an air inlet of an evaporator and pressure obtained at an air pressure sampling port of an air outlet of the evaporator, of the air pressure difference switch is larger than the defrosting starting pressure difference. The defrosting control signal triggers the first control valve to be switched to a starting state and triggers the second control valve to be switched to a stopping state. By adoption of the defrosting and refrigerating system and the cold storage, the defrosting efficiency of the evaporator of the cold storage is improved, the defrosting time is shortened, and influence on the cold storage temperature during defrosting is reduced.

Disclosed are a defrosting system of a heat pump water heater and a control method of the defrosting system. The defrosting system comprises a compressor, a condenser, a throttling element, a liquid accumulator, an evaporator and a gas-liquid separator which are sequentially connected, a first electric heating pipe is welded in the liquid accumulator and serially connected with a first temperature controller disposed in the liquid accumulator to be connected with a controller, a second electric heating pipe is welded in the gas-liquid separator and serially connected with a second temperature controller disposed in the gas-liquid separator to be connected with the controller, a compressor exhausting temperature sensor is arranged on the pipe wall of an exhausting pipe of the compressor, an evaporator outlet temperature sensor is arranged in an outlet pipeline of the evaporator, a water temperature sensor contacting with water is arranged in the condenser, the compressor exhausting temperature sensor, the evaporator outlet temperature sensor and the water temperature sensor are all connected with the controller, and the throttling element is also connected with the controller. By the defrosting system, the problems of low water temperature, long defrosting time, low defrosting efficiency, inaccurate judgment on controlling of defrosting starting and defrosting finishing and the like in the process of defrosting can be solved.

The invention discloses a bypass defrosting device with four-port valves, which comprises a compressor, a gas-liquid separator, a high-pressure reservoir, at least two four-port valves, at least two groups of heat exchanging components in a condensing side, and at least two groups of heat exchanging components at an air side. The first port of each four-port valve is connected with the vent of the compressor, and the second port of each four-port valve is connected with one end of each heat exchanging component at the condensing side, the other end of the heat exchanging component is connected with the high-pressure reservoir; one end of each heat exchanging component at the air side is connected with the high-pressure reservoir, the other end of each heat exchanging component at the air side is respectively connected with the third port of the corresponding four-port valve, the input end of the gas-liquid separator is connected with the fourth port of each four-port valve, and the output end of the gas-liquid separator is connected with the intakeport of the compressor. The bypass defrosting device with the four-port valves has small system pressure fluctuation during defrosting, higher reliability and stability, good defrosting effect, short defrosting time and simple structure, and can implement heating and defrosting at the same time.

A defrosting method for air-cooled heat pump system features that the condensing pressure is controlled by pressure difference control valve and / or condensing pressure regulating valve. Its defrosting device is composed of air heat exchanger, liquid storage unit, pressure controller, and one-way valve.

The invention discloses a heat exchanger and an air conditioning unit, wherein the heat exchanger comprises a first heat exchange unit and a second heat exchange unit which are arranged side by side along the flowing direction of the air, and a cavity is arranged between the first heat exchange unit and the second heat exchange unit. According to the heat exchanger and the air conditioning unit, the heat exchange efficiency is effectively improved, the defrosting time is shortened, and the comfort of users during using is improved.

The invention discloses a circulating defrosting system which comprises a compressor, an evaporator, a condenser, a heat accumulator and a defrosting circulating pipeline. An inlet of the compressor is connected with an outlet of the evaporator. An inlet of the evaporator is connected with an outlet of the condenser through a capillary pipe. An inlet of the condenser is connected with a heat accumulating outlet of the heat accumulator. A heat accumulating inlet of the heat accumulator is connected with an outlet of the compressor. A heat releasing inlet of the heat accumulator is connected with an outlet of the defrosting circulating pipeline. A heat releasing outlet of the heat accumulator is connected with an inlet of the defrosting circulating pipeline. A water pump is arranged on a pipeline connecting the defrosting circulating pipeline and the heat releasing outlet. A normally-closed valve is arranged on a pipeline connecting the defrosting circulating pipeline and the heat releasing inlet. The defrosting circulating pipeline is attached to the outer side of a pipeline of the evaporator. The invention further provides a refrigerator and a defrosting method. By means of the circulating defrosting system, the refrigerator and the defrosting method, defrosting energy consumption can be lowered, defrosting time is short, and the influence on the temperature fluctuation of refrigerator chambers during defrosting is small.

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 embodiment of the invention provides an air conditioner for achieving defrosting without the reversing of a four-way valve required. According to the technical scheme of the air conditioner provided by the embodiment of the invention, the air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a first throttling device, an indoor front heat exchanger, a second throttling device and an indoor rear heat exchanger which are in pipeline connection with one another sequentially; the air conditioner further comprises a defrosting solenoid valve; one end of the defrosting solenoid valve is in pipeline connection with the compressor; and the other end of the defrosting solenoid valve is in pipeline connection with the outdoor heat exchanger.

The invention discloses a defrosting control method. A heating mode is firstly switched to a defrosting mode: reducing a frequency of a compressor from a first compression frequency to a second compression frequency; closing an electromagnetic valve, and reducing the frequency of the compressor is from a second compression frequency to a third compression frequency; when high and low pressure difference meets the reversing condition of a four-way reversing valve, opening the four-way reversing valve for reversing, and opening the electromagnetic valve at the same time; increasing the frequencyof the compressor from a third compression frequency to a fourth compression frequency, and switching to the defrosting mode; then, the defrosting mode is switched back to the heating mode: reducingthe compressor frequency from the fourth compression frequency to the second compression frequency; closing the electromagnetic valve, and reducing the compressor frequency from the second compressionfrequency to the third compression frequency when the high and low pressure difference meets the reversing condition of the four-way reversing valve; opening the four-way reversing valve for reversing, and opening the electromagnetic valve at the same time; increasing the compressor frequency from the third compression frequency to the first compression frequency; and switching back to the heating mode. According to the defrosting control method, the defrosting process is short in time consumption and small in temperature fluctuation.

The invention relates to a parallel flow heat exchanger, an air conditioner with the same and a control method of the air conditioner. Two sets of flat tubes are pressed in fin clamping grooves of a lower heat exchange unit of the parallel flow heat exchanger respectively to form two sets of independent circulating channels. When the air conditioner is in a defrosting state through reversing of a four-way valve, a first electromagnetic valve is powered on to be opened while a second electromagnetic valve is closed, and one part of high-temperature refrigerant coming out of a compressor passes through the first electromagnetic valve and a left collecting rube to directly enter the first flat tube channel in the lower heat exchange unit, is converged with refrigerant flowing from a second collecting tube and an upper heat exchange unit after a heat exchange process and then returns from the second flat tube channel. The defrosting speed of the lower heat exchange unit is increased, the defrosting time is shortened, and then the low-temperature heating capacity of a whole air conditioner system is improved. The design structure is simple, the effect is remarkable, and implementation is convenient.

The invention belongs to the field of steam compression type air source heat pumps and provides a heating and refrigeration vortex type air source heat pump system comprising a four-way reversing valve B, a high-pressure switch B, a water side shell and tube heat exchanger B, an exhaust temperature sensor B, an electromagnetic valve C, a fan B, a fin temperature sensor B, an air side fin heat exchanger B, a check valve F, an enhanced vapor injection compressor B, a low-pressure switch B, an air-liquid separator B, a pipeline filter, a check valve G, an electromagnetic valve D, a dry filter B,an electronic expansion valve, an economizer B, a liquid storage tank B, an electromagnetic valve E and other parts. With application of the heating and refrigeration vortex type air source heat pumpsystem, 1, the idea that refrigeration, heating and air supply of the heating and refrigeration vortex type air source heat pump system share the one electronic expansion valve is achieved, complexityand manufacturing cost are lowered, and full-working-condition refrigerating capacity and COP are promoted by 5% or above; and 2, during reverse cycle defrosting of the heating and refrigeration vortex type air source heat pump system, a refrigerant does not pass through the electronic expansion valve for throttling cooling and directly enters the water side shell and tube heat exchanger for heatexchange, room comfort is improved, and defrosting time is shortened by 5 seconds or above.

The invention discloses a refrigerator and a control method thereof. The refrigerator includes a refrigerator body, a door body and a refrigerating system, wherein the refrigerating system includes a compressor, a condenser, a switch unit, a refrigerating throttler, a freezing throttler, a refrigerating evaporator, and first and second freezing evaporators, wherein the inlet of the refrigerating throttler is connected with the first outlet of the switch unit; the inlet of the freezing throttler is connected with the second outlet of the switch unit; the inlet of the refrigerating evaporator is connected with the outlet of the refrigerating throttler; the inlet of the first freezing evaporator is connected with the outlet of the refrigerating evaporator; the outlet of the first freezing evaporator is connected with the inlet of the compressor; the inlet of the second freezing evaporator is connected with the outlet of the freezing throttler, and the outlet of the second freezing evaporator is connected with the inlet of the compressor; and both the first and the second freezing evaporators are arranged outside the freezing chamber. According to the embodiment provided by the invention, the refrigerator has the advantages of high refrigerating efficiency, low energy consumption and less frosting amount.

The invention discloses an integrated dual refrigerating and heating pump unit. The integrated dual refrigerating and heating pump unit comprises a refrigerating and / or heating circulating system, wherein the refrigerating and / or heating circulating system comprises a compressor, an oil separator, an air-cooled heat exchanger, a dual-refrigeration condenser, a bi-directional expansion throttling device and a user-side heat exchanger. Due to the fact that the dual-refrigeration condenser, the air-cooled heat exchanger, refrigerating and / or heating circulating, a freeze water hydraulic system, a water disposing system and a centralized control system are integrated into a whole, the integrated dual refrigerating and heating pump unit has the advantages of compact structure, high efficiency, energy conservation, convenience in mounting and maintenance and low manufacturing cost; meanwhile, the problems of effect to heating capacity and high power caused when the air-cooled heat exchanger is defrosted during heating in winter are solved, power consumption during defrosting is low, the defrosting time is short, water can be timely removed, and heating is restored as soon as possible.

The invention discloses a temperature control device for yielding water of a single-heat type heat pump water heater. A pipeline is connected with a heat storage water tank, a tee-joint proportioning valve, a heating water heat exchanger, a water pump and a yielding water constant temperature control module connected with the heat storage water tank, wherein the yielding water constant temperature control module is connected with an ambient temperature probe, and controls the switching on and off of the tee-joint proportioning valve; and an opening in the A-B direction of the tee-joint proportioning valve is communicated with a water inlet end, and an opening in the B-C direction is communicated with the heating water heat exchanger. In addition, the invention also discloses a temperature control method, the temperature of the heat storage water tank, the ambient and the heating water heat exchanger are subjected to sampling detection, and according to different ambient temperatures, different yielding water temperature values can be set, the switching on-off degree of the tee-joint proportioning valve is adjusted, the water feeding amount is adjusted by the temperature control regulating valve, so that the yielding water temperature of the heating water heat exchanger can reach the set value. The temperature control device can run with safety, stability and high efficiency, and meanwhile, the engineering installation is simple, the cost is low, and the supplied hot water is constant.

Provided is an external auxiliary heating frosting-proof capillary throttling integrated device. The external auxiliary heating frosting-proof integrated device is composed of a capillary throttling device and an external auxiliary heating component, so that product structure is optimized. Modification area based on an original device is small and installation and changing are easy. Only the rear half portions, namely, the portions close to the outdoor evaporation side, of thermal coated throttling capillary tubes need to be heated, so that a refrigerant energy is improved, evaporation temperature is increased and the energy efficiency ratio of products is improved. The external auxiliary heating frosting-proof capillary throttling integrated device is suitable for all the other heat pump forms such as air source heat pumps, soil source heat pumps, water source heat pumps and heat source towers, so that the heat pumps can run more efficiently in adverse low-temperature high-humidity winter and the problem that the heat pumps are easy to frost when running in the environment is solved.

The invention provides an outdoor device for an air conditioner, and the air conditioner, and relates to the technical field of air conditioners. By adoption of the outdoor device for the air conditioner, and the air conditioner, the technical problem of poor heat exchange performance, caused by frosting, of outdoor heat exchangers is solved. The outdoor device for the air conditioner comprises adevice body and an anti-frosting protection layer arranged on the whole or one part of the device body. The device body is an outdoor heat exchanger of the air conditioner. The anti-frosting protection layer is a deicing layer. By arranging the deicing layer on one part of or the whole exposed surface of the outdoor heat exchanger, the appearance of ice crystals can be delayed, the problem of frosting of the surface of the heat exchanger is effectively solved, and the frosting degree of the outdoor heat exchanger is greatly reduced or the frosting start time of the outdoor heat exchanger is greatly delayed. When the air conditioner operates in a defrosting mode, frost can be rapidly removed from the surface of the heat exchanger; the defrosting time is short, and the efficiency is high; and when removed from the surface of the heat exchanger, condensate water or frost can take away tiny particles such as dust on the surface of the heat exchanger, and thus, a good self-cleaning functionis achieved.

The invention provides a low-temperature strong-heat air source heat pump system. The system comprises a compressor, an air-cooled condenser, a one-way valve assembly, a flash tank, an economizer, a water side heat exchanger and a gas-liquid separator. An air suction port of the compressor is connected with the gas-liquid separator, an exhaust port of the compressor is connected with the air-cooled condenser or the water side heat exchanger through a four-way reversing valve, and an air supplement port of the compressor is connected with an air supplement loop and a liquid spraying loop. The air-cooled condenser is connected with a first-stage throttling electronic expansion valve through the one-way valve assembly; the first-stage throttling electronic expansion valve is connected with the flash tank through a drying filter A; a liquid outlet of the flash tank is connected with a main side inlet of the economizer, and an air supply port of the flash tank is connected with the air supply loop; a main side outlet of the economizer is connected with the liquid spraying loop and a second-stage throttling electronic expansion valve; and the second-stage throttling electronic expansionvalve is connected with the economizer through a drying filter B, and the second-stage throttling electronic expansion valve is connected with the water side heat exchanger or the air-cooled condenserthrough the one-way valve assembly.

The invention discloses a technical scheme of a parallel type mutual-assistance defrosting air source heat pump water heater. The parallel type mutual-assistance defrosting air source heat pump water heater is characterized in that a unit is provided with two or more refrigerant loop systems, and defrosting is sequentially performed in two groups. Air inlet ducts of the two systems are isolated through a partition plate. Water inlets of hot water heat exchangers of the systems are connected with a water outlet of a circulating water pump in parallel. Water outlets of the hot water heat exchangers are each divided into two paths of connectors; after being connected with a constant temperature water outflow valve, one path of connector is connected to a hot water outflow main pipe in parallel, and after being connected with a check valve, the other path of connector is connected to a circulating water main pipe in parallel; the circulating water main pipe provided with a circulating water regulating valve and a water inflow pipe are connected to a water inlet of the circulating water pump together in parallel, and a parallel type hot water heat exchange system for hot water inner circulation is formed; during defrosting, the defrosting system is switched to bypass hot gas or reverse circulating dedusting, the other system continues to perform heating circulation, the two systems perform defrosting in a mutual-assistance manner through hot water inner circulation, the defrosting problem of the air source heat pump water heater is thoroughly solved, and the worry that defrosting is not thorough is avoided forever; and in addition, due to the addition of the system of a supercooler, efficiency can be improved by 15%.

The invention discloses an indoor unit of an air conditioner, the air conditioner and a defrosting control manner of the air conditioner. The indoor unit of the air conditioner comprises an air outlet, an indoor heat exchange device and at least one parallel pipeline assembly, wherein the air outlet at least comprises a lower air outlet, the indoor heat exchange device comprises at least two indoor heat exchangers which are vertically connected in series, the parallel pipeline assembly comprises communicating pipeline and a first valve arranged on the communicating pipeline, and the parallel pipeline assembly is connected with a heat exchanger pipeline assembly formed by at least one indoor heat exchanger located in front of the bottommost indoor heat exchanger in parallel. When the air conditioner is in the defrosting mode, the first valve is in the opened state. When the air conditioner conducts defrosting, heat supply is continuous, the temperature drop in the movement area of a human body can be reduced, and the comfort on the indoor side is improved.

Provided are a refrigerator frost collection plate and a defrosting prompt system and a control method of the refrigerator frost collection plate. The frost collection plate comprises a frost collection plate body and a clear frost plate fixed to the frost collection plate body in a spliced mode. The refrigerator frost collection plate body is tightly fixed to the upper surface of a top evaporator, the clear frost plate is located on the front side of the top evaporator, and the frost collection plate body is located on the rear side of the top evaporator. The system comprises the refrigerator frost collection plate, an evaporator temperature sensor, a freezing chamber compartment temperature sensor, a defrosting indicator light and a controller, wherein the evaporator temperature sensor is fixed to the bottom of the top evaporator, the freezing chamber compartment temperature sensor is arranged in the middle of a freezing chamber, the defrosting indicator light is fixed to the front of a refrigerator, the controller is connected with the evaporator temperature sensor, the freezing chamber compartment temperature sensor and the defrosting indicator light, and the controller is also connected with a compressor. Water vapor of the freezing chamber is guided by the frost collection plate to gather and frost at a specific position, and the surface of the evaporator is slightly frosted or is frostless; when defrosting conditions are reached, the defrosting indicator light sends out a defrosting prompt to remind people of defrosting; defrosting is convenient and fast, a power failure does not occur during defrosting, and time and labor are saved.

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 wire-and-tube evaporator, belonging to the technical field of a refrigerating apparatus. The wire-and-tube evaporator comprises an evaporation tube which is roundabout and snakelike and metal wires which are combined on at least one side of the evaporation tube in a grid shape. The wire-and-tube evaporator is characterized in that the outer wall of the evaporation tube is combined with an electric heating wire pipe which has the same winding shape with the evaporation tube and accompanies with the evaporation tube all the time, and the electric heating wire pipe is internally inserted with an electric heating wire. In the invention, as the electric heating wire pipe inserted with the electric heating wire always accompanies with the evaporation tube, when the power supply of the electric heating wire is switched on while defrosting, the electric heating wire heats the electric heating wire pipe to melt frosts concentrated on the surface of the evaporation tube, thus achieving short defrosting time and good overall defrosting effect; when the evaporation tube is in a working condition, the electric heating wire pipe makes an effect on enlarging evaporation area; in addition, and the electric heating wire pipe has good enhancement effect on the evaporator tube so as to achieve firm overall structure.

The invention relates to the technical field of air-conditioning and discloses a heat storage defrosting air-conditioning system. The heat storage defrosting air-conditioning system comprises a refrigerant loop and further comprises a first heat storage device and a second heat storage device. A compressor, an indoor heat exchanger, a throttling device, an outdoor heat exchanger and a reversing valve which is used for changing the flow direction of refrigerant are disposed on the refrigerant loop; first heat exchange pipes are disposed in the first heat storage device; second heat exchange pipes are disposed in the second heat storage device; the first heat exchange pipes are in parallel connection with the indoor heat exchanger; the second heat exchange pipes are in parallel connection with a refrigerant pipeline arranged between the reversing valve and the indoor heat exchanger; and the first heat exchange pipes, the second heat exchange pipes and the indoor heat exchanger are selectively connected into the refrigerant loop. According to the heat storage defrosting air-conditioning system, indoor heat is not utilized, the stored heat amount is large, the defrosting time is short, the defrosting effect is good, and the stability of an indoor temperature field and heat comfort of a human body can be improved. The invention further provides a control method of the heat storage defrosting air-conditioning system.