44results about How to "Rapid heat transfer" patented technology

A cryoprobe for use in cryosurgery and other applications comprising a rigid outer tube, an inner coolant inlet tube a short rigid penetrating segment extending distally from the distal end of the outer tube and a helical-shaped baffle having a heating element disposed about the outer surface of the inlet tube. The baffle is adapted to produce turbulent fluid flow improving heat transfer and is able to warm target tissue during rapid freezing and thawing cycles.

The invention discloses a test method of metal hydride thermal adsorption and desorption of hydrogen cycle life and a special device thereof. The test device consists of a gas cycling system, a sample chamber heating and cooling system and a computer data collection and control system. The gas cycling system provides a vacuum environment and high-purity hydrogen source to the test system; the sample chamber heating and cooling system rapidly and circularly heats and cools the test sample; and the computer data collection and control system controls a heating and cooling program to run and controls the opening and closing of relevant electromagnetic valve and electric valve and instantly collect the pressure and temperature signal of the system. While completing the test of the cycle of the metal hydride thermal adsorption and desorption of hydrogen, the system also can test the alloy adsorption and desorption hydrogen performance such as PCT curve and dynamics curve and the constant-temperature adsorption and desorption hydrogen service life in situ.

The invention discloses a semi-aromatic polyamide PA11T and a synthetic method thereof and belongs to the technical field of high polymer material synthesis. The structure formula is shown in the description, wherein n is 10-200. The 1, 11-undecanedioic diamide and the terephthalic acid are taken as the raw materials and the synthetic process is finished in a drum type reaction kettle through a one-pot method. By adopting the method, the reaction devices and the synthetic steps are few, the reaction time is short, the polymerization temperature is low, and the method is pollution-free and suitable for the large-scale industrial production. The PA11T produced by the process is excellent in performance and has a good market prospect in the industries such as the electric products and the automobiles.

The invention discloses a metal hydride thermal adsorption and desorption hydrogen cycling comprehensive test device, which consists of a gas cycling system, a sample chamber heating and cooling system and a computer data collection and control system. The gas cycling system provides a vacuum environment and high-purity hydrogen source to the test system; the sample chamber heating and cooling system rapidly and circularly heats and cools the test sample; and the computer data collection and control system controls a heating and cooling program to run and controls the opening and closing of relevant electromagnetic valve and electric valve and instantly collect the pressure and temperature signal of the system. While completing the test of the cycle of the metal hydride thermal adsorption and desorption of hydrogen, the system also can test the alloy adsorption and desorption hydrogen performance such as PCT curve and dynamics curve and the constant-temperature adsorption and desorption hydrogen service life in situ.

The invention relates to an easy-to-clean coating with high microwave absorbing property as well as a preparation method and an application thereof. The easy-to-clean coating with high microwave absorbing property comprises 10-40wt% of microwave absorbing material binder, 5-10wt% of microwave absorbing material, 50-80wt% of hydrophilic easy-to-clean material and 1-2wt% of auxiliary. In preparation, all raw materials are proportionally mixed together. The easy-to-clean coating with high microwave absorbing property provided by the invention can be widely applied to kitchen electric products and has the properties such as thin coating, high microwave absorbing property and easiness in cleaning.

The invention relates to a breezeless or gentle breeze air conditioner indoor unit. The breezeless or gentle breeze air conditioner indoor unit is characterized in that the air conditioner indoor unit is formed by connecting a radiation convection current heat exchanging pipe piece, a refrigerant pipe piece, a return air structure and an air outlet structure; the radiation convection current heat exchanging pipe piece is composed of at least one radiation convection current heat exchanging pipe which is provided with an inner pipe and an outer sleeve, and the two ends of the inner pipe of each radiation convection current heat exchanging pipe are connected with the return air structure and the air outlet structure; and the refrigerant pipe piece comprises a refrigerant inlet pipe component and a refrigerant outlet pipe component which are arranged at the two ends of each radiation convection current heat exchanging pipe, and the refrigerant inlet pipe component and the refrigerant outlet pipe component communicate with a flow channel between the inner pipe and the outer sleeve of each radiation convection current heat exchanging pipe. The radiation convection current heat exchanging pipe piece is composed of one or more radiation convection current heat exchanging pipes, by means of ventilation and air outlet of the inner pipes, outer walls of the outer sleeves and the indoor air carry out cold and heat exchanging, breezeless or gentle breeze running can be achieved, the comfort level of the human body in a room is greatly improved, and the situations that as the air speed of the air conditioner indoor unit is too large, the human body feels uncomfortable and the immunity is lowered are avoided.

The invention relates to a radiating device used for radiating an electronic element, comprising a base contacting with the electronic element, a first radiator arranged on the base, a second radiator arranged on the first radiator and at least one heat tube connecting the base with the first and the second radiators. The first radiator comprises a base plate and a plurality of radiating fins extending from the base plate. The second radiator comprises a base plate and a plurality of radiating fins extending from the base plate. The at least one heat tube comprises a vaporizing section and a first and a second condensing sections parallel to the vaporizing section. The vaporizing section and the first condensing section are arranged between the base and the base plate of the first radiator. The second condensing section is arranged on the base plate of the second radiator. The radiator of the radiating device has simple manufacturing process and relatively large radiating area. Furthermore, the heat tube of the radiating device comprises two condensing sections so that fast heat transferring and evening effect can be achieved, thereby improving the radiating efficiency of the radiating device.

The invention discloses a twisting packing machine for special-shaped candy sticks. The twisting packing machine comprises a machine body, a conveying chain, a clamping chain, an upper paper feeding wheel, a lower paper feeding wheel and a transverse sealing and cutting device, and the upper paper feeding wheel and the lower paper feeding wheel are arranged in an oppositely rolling mode. A clamping arm disc and a twisting arm disc are coaxially arranged on the machine body, a plurality of pairs of inner clamping arms and outer clamping arms are evenly arranged on the disc face of the clamping arm disc, electric heating elements are arranged on the inner clamping arms, a plurality of pairs of twisting arms are arranged on the disc face of the twisting arm disc, the number of pairs of the twisting arms on the twisting arm disc is equal to the number of pairs of the inner clamping arms and outer clamping arms on the clamping arm disc, and the twisting arms on the twisting arm disc correspond to the inner clamping arms and outer clamping arms of the clamping arm disc one to one. According to the twisting packing machine for the special-shaped candy sticks, twisting packing can be carried out on candies in the continuous motion process, therefore, the defects due to the fact that only one pair of twisting arms is applied to be matched with an intermittent mechanism on an existing machine are overcome, and the advantages of being reasonable in structure, small in mechanical vibration, high in production speed and high in efficiency are achieved.

An anti-carbon synthesis gas methanation catalyst takes 55-85 percent by weight of gama-Al2O3 as a carrier, 10-40 percent by weight of Ni as an active component, and 1-7 percent by weight of one of Mo, Co, La and Ce as an additive.. The anti-carbon synthesis gas methanation catalyst disclosed by the invention has the advantages of high catalytic activity, high heat stability, strong anti-carbon capability and long catalyst service life.

The invention relates to a hydrophilic antibacterial water absorption material and a preparation method thereof. The hydrophilic antibacterial water absorption material is prepared from, by mass, 90%-97% of water absorption material inorganic adhesive, 2%-8% of water absorption material, 0.5%-1% of antibacterial material and 0.5%-1.5% of additive. The water absorption material inorganic adhesive is a hydrophilic inorganic material. In the preparation process, all the components are mixed to be uniform. The hydrophilic antibacterial water absorption material can be applied to kitchen electrical products and has the advantages of being easy to clean, free of potential health hazards, good in temperature resistance, simple in production process and good in antibacterial performance and wave absorption performance, saving time and materials and the like.

The invention discloses a multi-stage electrothermal quick steam generating device, and belongs to the technical field of steam heating appliances. The multi-stage electrothermal quick steam generating device comprises a steam generating device body, wherein a water inlet pipe and a steam outlet pipe are respectively arranged on both ends of the steam generating device body, and at least two heating pipes for generating steam are arranged between the water inlet pipe and the steam outlet pipe. According to the multi-stage electrothermal quick steam generating device, water in the heating pipesare heated at three stages so as to generate steam, so that sufficient and stable steam without time limit can be quickly supplied, the heat efficiency is high, and the effects of cleanness and no pollution are achieved; a nano electrothermal film electric heating technique is adopted, so that heat can be quickly generated by electrical energy so as to be transferred to water and steam, steam canbe quickly generated, and scales are not accumulated inside basically; and a small quantity of accumulated scales are limited in a metal pipe, so that potential safety hazards of cracking of the heating pipes do not exist.

The invention discloses a plate type heat transfer machine, comprising a body, a first transfer portion and a second transfer portion, which are arranged on the front and rear parts of the upper and lower guide parts inside the frame of the body and move heat transfer by tapes, and an electric heating plate controlled by an air pressure cylinder, an oil pressure cylinder or an electric cylinder on a support, a plurality of cylinders controlling the lift of the electric heating plate are disposed on a plurality of pallets, the electric heating plate is evenly connected to the first and second transfer portions of a texture when heat transferring, preventing the minus effect that a transfer paper is only transferred on the edge of the texture in a current heat transfer machine using a cylinder, and having favorable effect that a transfer paper is evenly transferred.

The invention discloses a carbon nano tube fiber yarn composite thermal expansion material type laser photo-thermal driver. The carbon nano tube fiber yarn composite thermal expansion material type laser photo-thermal driver comprises a carbon nano tube fiber yarn winding thermal expansion material multi-layer stacking type laser photo-thermal driver, a carbon nano tube fiber yarn spinning cloth and thermal expansion material layer stacking spiral type laser photo-thermal driver, and a carbon nano tube fiber yarn composite thermal expansion material cylindrical laser photo-thermal driver or acarbon nano tube fiber yarn spring composite thermal expansion material integrated laser photo-thermal driver. Nano particle composite type carbon nano tube fiber yarn includes that nano particles andcarbon nano tube fiber yarn are assembled or compounded; under the laser photo-thermal effect, a thermal expansion material layer has a driving effect, and a synergic amplifying effect is achieved ondriving of nano particle composite carbon nano tube fiber yarn spiral winding layers which are in tight contact; and due to the multi-layer stacking structure of the carbon nano tube fiber yarn composite thermal expansion material type laser photo-thermal driver, linked and synergic stretching and contracting or rotating driving strengthening effects are generated under the photo-thermal effect.

The invention discloses a device for cooling an electronic element by utilizing a bionic alveolar heat exchanger. The device is used for heat exchange of the electronic element, and comprises the bionic alveolar heat exchanger and cooling equipment, wherein the bionic alveolar heat exchanger is fixed on the electronic element through a heat conduction fixing piece, is used for absorbing heat generated by the electronic element or a micro-electronic element, and is internally provided with a power core used for providing a refrigerant with flowing power, a loop heat pipe refrigerant channel used for circulation of the refrigerant, and a cavity; the cooling equipment is connected with the cavity through a micro-channel; the refrigerant is arranged in the micro-channel; and the refrigerant isused for transferring the heat to the cooling equipment for heat exchange so as to dissipate heat.

The invention discloses a test method of metal hydride thermal adsorption and desorption of hydrogen cycle life and a special device thereof. The test device consists of a gas cycling system, a sample chamber heating and cooling system and a computer data collection and control system. The gas cycling system provides a vacuum environment and high-purity hydrogen source to the test system; the sample chamber heating and cooling system rapidly and circularly heats and cools the test sample; and the computer data collection and control system controls a heating and cooling program to run and controls the opening and closing of relevant electromagnetic valve and electric valve and instantly collect the pressure and temperature signal of the system. While completing the test of the cycle of the metal hydride thermal adsorption and desorption of hydrogen, the system also can test the alloy adsorption and desorption hydrogen performance such as PCT curve and dynamics curve and the constant-temperature adsorption and desorption hydrogen service life in situ.

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 provides a cooling device, a crystallizer structure adopting the cooling device and a cooling method for the interior of a crystallizer. The cooling device comprises a water inlet pipe, a water outlet pipe and a middle connecting pipeline. The water inlet pipe and the water outlet pipe communicate with the middle connecting pipeline. Cooling working media are introduced into the cooling device and can cool molten steel in contact with the outer portion of the cooling device; and the temperature difference between the molten steel and the cooling working media is large, the flowing speed of the motel steel nearby a submersed nozzle is high, convective heat transfer is quick, and a good cooling effect can be achieved. According to the crystallizer structure, the cooling device and the cooling method for the interior of the crystallizer in the scheme, the traditional continuously cast blank cooling manner from the outside to the inside is changed, and the molten steel is cooled mainly through the middle connecting pipeline in the crystallizer; and the structure is simple and reasonable, the temperature gradient between a solidification front of a cast blank and a liquid core of the cast blank can be reduced, and the function of reducing the degree of superheat of the molten steel in the casting process is achieved.

The invention belongs to the technical field of air conditioners, and aims to solve the problem that the self-cleaning control mode of an existing air conditioner is generally slow in frosting speed,so that the whole self-cleaning time is long, and the normal experience of a user is influenced. In order to solve the problem, the invention provides a self-cleaning control method for an air conditioner. 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 storagetank; the self-cleaning control method comprises the steps that under the refrigeration working condition, frequency ascending is carried out on a compressor, an indoor fan of the air conditioner isclosed, and the rotating speed of the liquid pump is increased, so that an indoor heat exchanger is frosted; after the indoor heat exchanger is frosted, an electronic expansion valve is closed firstly, and then an electromagnetic valve at the low pressure side of the compressor is closed after a preset time; and the indoor heat exchanger is heated, so that the indoor heat exchanger is subjected todefrosting 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 can be improved.

The invention belongs to the technical field of air conditioners, aims to solve the problems that by means of a self-cleaning control mode of an existing air conditioner generally, the frosting speedis generally slow, so that the whole self-cleaning time is long, and the normal experience of a user is influenced, and provides a self-cleaning control method for an air conditioner. The air conditioner comprises a refrigerant circulation system and a solution circulation system which is composed of an indoor liquid film, an outdoor liquid film, a liquid pump and a liquid storage box. The self-cleaning control method comprises the steps that under a refrigeration working condition, frequency reducing is carried out on a compressor, and reversing is carried out on a four-way valve; the openingdegree of an electronic expansion valve is reduced, the rotating speed of an outdoor fan of the air conditioner is reduced, and the rotating speed of the liquid pump is improved, so that an outdoor heat exchanger is frosted; after the outdoor heat exchanger is frosted, the electronic expansion valve is closed, and then a solenoid valve at the low-pressure side of the compressor is closed after preset time; and the outdoor heat exchanger is heated, so that the outdoor heat exchanger is defrosted and cleaned. The method can improve the self-cleaning efficiency of the outdoor heat exchanger andimprove the user experience.

The invention relates to the technical field of ultrasonic equipment. The invention particularly discloses an ultrasonic host. The ultrasonic host comprises a shell, a circuit structure and a heat dissipation structure, and the shell comprises a first shell body and a second shell body. The first shell and the second shell are buckled to form a first accommodating cavity and a second accommodatingcavity, and the first containing cavity and the second containing cavity are separated through a first sealing waterproof structure. A second sealing waterproof structure is arranged in an area, corresponding to the first accommodating cavity, in the joint of the first shell and the second shell; the circuit structure is located in the first containing cavity, the heat dissipation structure is located in the second containing cavity, and air holes are formed in the areas, corresponding to the second containing cavity, of the first shell and the second shell. The invention further discloses portable ultrasonic imaging equipment. The heat dissipation efficiency of the ultrasonic host is improved, and the service life of the ultrasonic host is prolonged.

The invention belongs to the technical field of air conditioners, and provides a self-cleaning control method for an air conditioner to solve the problems that a self-cleaning control mode of an existing air conditioner is generally low in frosting speed, and consequently the whole self-cleaning time is long, and the normal experience of a user is influenced. The air conditioner comprises a refrigerant circulating system and a solution circulating system which is composed of an indoor solution film, an outdoor solution film, a liquid pump and a liquid storage tank. The self-cleaning control method comprises the steps: under the working condition of refrigeration, the frequency of a compressor is increased, the opening degree of an electronic expansion valve is decreased, the rotating speedof the liquid pump is increased, and thus an indoor heat exchanger is frosted; after the indoor heat exchanger is frosted, the electronic expansion valve is closed firstly, and then a solenoid valveon the low-voltage side of the compressor is closed after the preset time; and the indoor heat exchanger is heated, and thus the outdoor heat exchanger is subjected to frosting cleaning. The self-cleaning efficiency of the indoor heat exchanger can be improved, and the user experience is improved.

The invention belongs to the technical field of air conditioners, aims to solve the problem that the normal user experience is affected by the whole longer self-cleaning time due to the fact that thefrosting speed is generally slow in a self-cleaning control mode of an existing air conditioner, and provides a self-cleaning control method for an air conditioner. The air conditioner comprises a refrigerant circulatory system and a solution circulatory system, wherein the solution circulatory system is composed of an indoor solution film, an outdoor solution film, a liquid pump and a liquid storage tank. The self-cleaning control method comprises the steps that under a heating working condition, the rotating speed of an outdoor draught fan of the air conditioner is reduced and the rotating speed of the liquid pump is increased, so that an outdoor heat exchanger frosts; after the outdoor heat exchanger frosts, firstly an electronic expansion valve is closed, and an electromagnetic valve on the low-voltage side of a compressor is closed after preset time; and the outdoor heat exchanger is heated, so that the outdoor heat exchanger defrosts and is cleaned. The self-cleaning control method for the air conditioner can improve the self-cleaning efficiency of the outdoor heat exchanger, and improve the user experience.

The invention belongs to the technical field of air conditioners, aims to solve the problems that by means of a self-cleaning control mode of an existing air conditioner, the frosting speed is generally slow, so that the whole self-cleaning time is long, and the normal experience of a user is influenced, and provides a self-cleaning control method for an air conditioner. The air conditioner comprises a refrigerant circulation system and a solution circulation system composed of an indoor liquid film, an outdoor liquid film, a liquid pump and a liquid storage box. The self-cleaning control method comprises the steps that under a heating working condition, frequency reducing is carried out on a compressor, and reversing is carried out on a four-way valve; frequency increasing is carried outon the compressor, the opening degree of an electronic expansion valve is reduced, and the rotating speed of the liquid pump is improved, so that an indoor heat exchanger is defrosted; after the indoor heat exchanger is frosted, the electronic expansion valve is closed, and then an electromagnetic valve on the low-pressure side of the compressor is closed after preset time; and the indoor heat exchanger is heated so as to perform defrosting and cleaning on the indoor heat exchanger. The method can improve the self-cleaning efficiency of the indoor heat exchanger and improve the user experience.

The invention belongs to the technical field of air conditioners, aims to solve the problem that the self-cleaning control method of an existing air conditioner generally has a low frosting speed, consequently, the whole self-cleaning time is long, and the normal experience of a user is affected, and, to this end, provides a self-cleaning control method for an air conditioner. The air conditionerincludes 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 tank, the self-cleaning control method includes the steps that under a heating condition, the frequency of a compressor is increased, the opening degree of an electronic expansion valve is decreased, the rotation speed of theliquid pump is increased, and thus an outdoor heat exchanger frosts; after frosting of the outdoor heat exchanger, the electronic expansion valve is closed, and then a solenoid valve on the low-pressure side of the compressor is closed after a preset time; and the outdoor heat exchanger is heated to defrost and clean the outdoor heat exchanger. According to the self-cleaning control method for anair conditioner, the self-cleaning efficiency of the outdoor heat exchanger can be improved, and the user experience is improved.

The invention discloses a drying device of a clamping heat conduction type film laminating machine. The device comprises a drying box, a heating roller, heat conduction blocks, heat transfer plates, aheating block and an air inducing mechanism. According to the device, the inner structure of the heating roller is elaborately designed, a heating groove is formed in one end of the heating roller inthe axial direction from the middle to the inside, and a plurality of heat conduction grooves are formed in one end of the heating roller in the axial direction from the periphery to the inside; a plurality of heat transfer grooves are formed between the heating groove and the plurality of heat conduction grooves, then the heating block are installed in the heating groove, the heat transfer plates are installed in the heat transfer groove, the heat conduction blocks are installed in the heat conduction groove, and the outer sides of the heat transfer plates are connected with T-shaped clamping grooves of the heat conduction blocks through T-shaped clamping connection teeth in a clamped mode; and the inner sides of the heat transfer plates are connected with dovetail-shaped clamping grooves of the heating block through dovetail-shaped clamping blocks in a clamped mode, so that the stability of the contact among the heat conduction blocks, the heat transfer plates and the heating blockis guaranteed, moreover, the contact completeness is improved, the two ends of the heat transfer plates extend to the interior of the heat conduction blocks and the interior of the heating block, so that rapid heat conduction and heat transfer are achieved.

The invention discloses a porous flat plate type radiator, a porous flat plate type radiator system and a manufacturing method of a porous flat plate type radiator. The porous flat plate type radiatorcomprises a radiator body, wherein a cavity is formed in the radiator body, and a porous structure is formed on the inner wall of the bottom of the cavity; a heat pipe working medium is arranged in the cavity; the outer surface of the bottom portion of the cavity is ground flat to serve as a heat transfer contact plane. The porous structure is formed on the inner wall of the bottom of the cavityopposite to the heat transfer contact plane, so that heat conduction can be effectively and quickly achieved, heat generated by a heating element (such as a CPU) being in contact with the heat transfer contact plane is quickly and efficiently conducted, and the porous structure is used as a core of vaporization and can effectively improve the heat transfer efficiency; and meanwhile, the heat transfer contact plane is a plane formed by grinding, so that the flatness of the contact position of the heat transfer contact plane and the heating element is high, the contact thermal resistance can bereduced, and the heat transfer efficiency can be further improved.

The invention belongs to the technical field of air conditioners, and provides a self-cleaning control method for an air conditioner. The self-cleaning control method for the air conditioner aims to solve the problems that the whole self-cleaning time is relatively long, and the normal experience of a user is influenced due to the fact that an existing self-cleaning control mode for an air conditioner is generally slow. According to the self-cleaning control method for the air conditioner, the air conditioner comprises a refrigerant circulating system and a solution circulating system which iscomposed of an indoor solution film, an outdoor solution film, a liquid pump and a liquid storage tank. The self-cleaning control method comprises the steps that under a refrigeration working condition, the frequency of a compressor is reduced, and a four-way valve is reversed; the frequency of the compressor is increased, the rotating speed of an outdoor fan of the air conditioner is decreased,the rotating speed of the liquid pump is increased, and an outdoor heat exchanger is frosted; an electronic expansion valve is closed after the outdoor heat exchanger is frosted, and then an electromagnetic valve on the low-pressure side of the compressor is closed after a preset time; and the outdoor heat exchanger is heated, so that the outdoor heat exchanger is defrosted and cleaned. The self-cleaning control method has the advantages that the self-cleaning efficiency of the outdoor heat exchanger can be improved, and the user experience can be improved.

The invention belongs to the technical field of air conditioners, and aims to solve the problem that the self-cleaning control mode of the existing air conditioner is generally slow in frosting speed,so that the whole self-cleaning time is long, and the normal experience of users is affected. Therefore, the invention provides a self-cleaning control method for an air conditioner. The air conditioner comprises a refrigerant circulation system which is composed of an indoor heat exchanger, an electronic expansion valve, an outdoor heat exchanger, a compressor and a four-way valve, and a solution circulation system which is composed of an indoor solution film, an outdoor solution film, a liquid pump and a liquid storage tank. The self-cleaning control method comprises the following steps ofreducing the opening degree of the electronic expansion valve and increasing the rotating speed of the liquid pump under a heating working condition to frost the outdoor heat exchanger; after the outdoor heat exchanger is frosted, closing the electronic expansion valve first, and then closing the electromagnetic valve on the low-pressure side of the compressor after a preset time passes; heating the outdoor heat exchanger to defrost and clean the outdoor heat exchanger. The self-cleaning control method can improve the self-cleaning efficiency of the outdoor heat exchanger and improve the userexperience.