4544 results about "Four-way valve" patented technology

The invention discloses an air-conditioning system. The air-conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a control valve and a throttling control assembly. The first end of the four-way valve is connected with the second end of the four-way valve through the outdoor heat exchanger, the throttling control assembly, the indoor heat exchanger and the control valve in sequence. The third end of the four-way valve is connected with an exhaust outlet of the compressor. The fourth end of the four-way valve is connected with an air return opening of the compressor. The throttling control assembly is used for throttling a refrigerant flowing into the indoor heat exchanger from the outdoor heat exchanger, and meanwhile controlling the opening degree of a flow path between the outdoor heat exchanger and the indoor heat exchanger. The invention further provides an air-conditioner and a refrigerant recycling control method. According to the air-conditioning system, the air-conditioner and the refrigerant recycling control method, when the refrigerant is recycled, the throttling control assembly can be closed directly so as to recycle the refrigerant, the control valve is closed to achieve automatic recycling of the refrigerant when refrigerant recycling is completed, and thus the refrigerant recycling cost can be reduced.

An intelligent multi-loop thermal management system for and electric vehicle has components including a battery pack, an electric-drive module, an on-board charger a DC / DC converter, a battery radiator, a battery refrigerator, a motor radiator, an electric water pump, an electric oil pump, an expansion tank, a PTC heater, a heat exchanger, an electric compressor, a condenser, an evaporator, a receiver drier, and a heater core. The system also includes an electric-drive module having a drive motor and a motor control unit. The components are thermally connected to each other by using a pipeline and a four-way valve, a three-way valve, a straight-through valve, and an electronic expansion valve that are disposed in the pipeline, to form a plurality of loops that separately performs thermal management and control the battery pack, the electric-drive module, and a passenger compartment air conditioner.

The invention discloses an air conditioner indoor / outdoor unit cleaning method. The method comprises the steps of: controlling a heat exchanger to be cleaned to enter a self-cleaning mode; adjusting the operation frequency of an air conditioner, the openness of a throttling device and the rotating speed of a fan corresponding to the heat exchanger to be cleaned, and controlling the evaporation temperature of the heat exchanger to be cleaned to keep in a preset range to condense the surface of the heat exchanger to be cleaned; condensing the heat exchanger to be cleaned by t1 time; detecting if the high / low pressure difference of the air conditioner reaches preset conditions; controlling a four-way valve to change the direction to perform the defrosting switching of indoor and outdoor heat exchangers when the high / low pressure difference of the air conditioner reaches the preset conditions; and adjusting air conditioner operation parameters when the high / low pressure difference of the air conditioner dose not reach the preset conditions, and then, controlling the four-way valve to change the direction to perform the defrosting switching of the indoor and outdoor heat exchangers when the high / low pressure difference of the air conditioner reaches the preset conditions. As the direction change of the four-way valve can be controlled through detecting if the high / low pressure difference of the air conditioner reaches the preset conditions, the higher shock on the compressor caused by excessive high / low pressure difference of the air conditioner can be prevented.

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

The invention discloses an air-conditioner internal and external unit cleaning method. The method comprises the steps that an indoor heat exchanger is controlled to enter a frosting mode; operation frequency of an air-conditioner, the opening degree of a throttling device and the rotating speed of an indoor fan are adjusted to enable evaporating temperature of the indoor heat exchanger to be kept within the preset range and the surface of the indoor heat exchanger to be frosted; frosting of the indoor heat exchanger lasts for time t1, later, frequency of a compressor is reduced, a four-way valve is controlled to be reversed, an outdoor heat exchanger enters a frosting mode, and meanwhile, the indoor heat exchanger is defrosted; the operation frequency of the air-conditioner, the opening degree of the throttling device and the rotating speed of an outdoor fan are adjusted, the evaporation temperature of the outdoor heat exchanger is kept within the preset range, and the surface of the outdoor heat exchanger is frosted; frosting of the outdoor heat exchanger lasts for time t2, the compressor is controlled to be shut down, and the indoor fan and the outdoor fan are kept starting until cleaning is completed. According to the air-conditioner internal and external unit cleaning method, the problem that in the prior art, the surface of the heat exchanger is cleaned through condensate water, and the effect is poor can be solved.

The invention provides a defrosting control method for an air conditioner. The air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device, outdoor heat exchangers, a refrigerant pipeline, a second throttling device, a first two-way valve and a second two-way valve. When defrosting begins, the second two-way valve is closed, and the first two-way valve is opened, a refrigerant sprayed by the compressor is divided into two branches at the second connecting point of the first two-way valve, wherein the main branch comprises the large part of refrigerant which flows to the first part heat exchanger of the outdoor heat exchangers to be used for defrosting, flows to the second part heat exchanger through the second throttling device to absorb heat and finally flows through the four-way valve to return into the compressor; the auxiliary branch comprises the other small part of refrigerant which flows through the indoor heat exchanger to exchange heat and flows through the first throttling device to join the main branch. In the defrosting process, the small part of the refrigerant flows to the indoor heat exchanger, an indoor unit has certain heat and does not have cold radiation, the problem that the indoor unit releases the refrigerating capacity to an indoor unit in the defrosting process of the air conditioner is solved, and the comfortable feeling of a user is improved.

The invention relates to air-conditioner intelligent detection technique, and discloses a method for detecting a four-way valve of an air-conditioner. The method for detecting the four-way valve of the air-conditioner can automatically detect and judge whether the four-way valve is normal or abnormal, and timely displays faults, so that convenience is provided for failure predication and after-sales repair. The method comprises the following steps: judging a work pattern when the air-conditioner is switched on; timing operation time of the air-conditioner when the air-conditioner is operated in a heating or a cooling mode; collecting present working frequency of a compressor when the operation time achieves a preset time threshold value; detecting and calculating a difference value of indoor environment temperature and indoor heat exchanger coil pipe temperature and a difference value of outdoor heat exchanger coil pipe temperature and outer environment temperature according to a specific working mode of the air-conditioner when the present working frequency of the compressor achieves a preset frequency threshold value; and judging the four-way valve is abnormal when setting conditions are met, and carrying out alarm reminding for the failure. The method for detecting the four-way valve of the air-conditioner is suitable for being used for intelligently detecting failure of the four-way valve of the air-conditioner.

The invention provides a sterilization method and device used for an air conditioner and the air conditioner. The sterilization method used for the air conditioner includes the steps of receiving a sterilization starting command of a user and starting an indoor fan to work according to the sterilization starting command; and when the working time of the indoor fan reaches first preset time, stopping the indoor fan, opening a four-way valve and starting a compressor and an outdoor fan to enable the air conditioner to work in a heating mode so as to increase the temperature of an indoor heat exchanger, and accordingly executing sterilization operation on the air conditioner. By means of the technical scheme, the air conditioner can be effectively sterilized, health of the user is prevented from being affected by wind carrying bacteria and unpleasant smell, and the using experience of the user is improved.

The invention relates to a residual heat pump air conditioning system for fuel cell vehicle, which belongs to the technical field of the air conditioner for fuel cell vehicle. The invention is characterized in that the residual heat pump air conditioning system comprises a refrigerating circuit and a heating circuit, the refrigerating circuit and the heating circuit are connected with a compressor via a four-way valve, an inlet of the four-way valve is connected with an outlet of the compressor, a first outlet and a second outlet of the four-way valve are connected with the refrigerating circuit and the heating circuit, and a third outlet of the four-way valve is connected with the inlet of the compressor via a gas-liquid separator; the heating circuit comprises an external evaporator, the heat side of the external evaporator is connected in a cooling circuit of the fuel cell and the cool side is connected in the heating circuit; the cooling circuit of the fuel cell also comprises an electric control three-way valve, one end of which is connected with the fuel cell via a water pump and a second end and a third end respectively are connected with the inlet and the outlet at the heat side of the external evaporator. The air conditioning system can use the residual heat of the fuel cell for heat supply and has the advantages of energy saving, simple structure and wide adaptability to use area, etc.

The invention provides a vapor-injected air-conditioning system, a vapor-injected air-conditioning control method and an air-conditioner, which can solve the problems of incapability of refrigerant flow adjustment, complex structure, poor refrigerating / heating effect and the like of the prior art. The technical scheme includes that the vapor-injected air-conditioning system comprises a compressor, a controller, a four-way valve, a condenser, an evaporator, a flash evaporator, an electromagnetic valve and refrigerant pipes. Two refrigerant pipe connector ends of the flash evaporator are arranged at the refrigerant pipes between the evaporator and the condenser and connected with the refrigerant pipes on the respective side, a refrigerant outlet at one end of the flash evaporator is connected with the compressor through one refrigerant pipe provided with a one-way valve and the electromagnetic valve, and an electronic expansion valve is arranged on the refrigerant pipe arranged between the condenser and the flash evaporator. A vapor-injected flow control system is simplified, cost is reduced, refrigerant flow control of the system is optimized by using the electronic expansion valve for controlling, and refrigerating and heating performances are improved.

The invention relates to a heat pump hot water unit with in-water cycling heat exchanging loop, comprising refrigerant loop system, water-refrigerant heat exchanging system, signal collection and circuit control system. It is characterized in that the water-refrigerant heat exchanging system adopts forced internal-cycling loop constituted by water-refrigerant heat exchanger, reflux tube and internal-cycling pump or natural internal-cycling loop which uses diversion sleeve to separate spiral heat exchanger in heat storing water tank and water pre-heating device can be collocated; the refrigerant loop system has single cycling of single air heat source, independent cycling of double heat source with four functions and adopts the structure of three-way electromagnetic valve with pneumatic valve, four-way valve and multiple-path restrictor so as to make switch of all cycles convenient; wind-cold heat exchanger also has water fin tube. The unit efficiency of invention is high and defrosting in winter is complete. Pressure can not be overloaded in summer. Hot water in 55deg.C can be supplied quickly and continuously. Waste heat can be reclaimed or solar hot water can be made use of. It can save energy by 70-85% compared with electric water heater in annual average. The independent cycling unit with double heat source has refrigeration, heating, heating water and heating water with refrigeration functions.

The invention discloses a dual heat-source heat-pump hot water device with an extremely simple refrigerating loop. The device is characterized by mainly comprising a compressor, a hot water condenser, a wind heat exchanger, a water heat exchanger, a four-way valve, a bidirectional throttle and the like, wherein a high pressure inlet of the four-way valve is connected with the outlet of the hot water condenser, and the other three ports thereof are connected with air inlets of the wind heat exchanger, the water heat exchanger and the compressor respectively; other ports of the wind heat exchanger and the water heat exchanger are connected with the bidirectional throttle; the exhaust port of the compressor is connected with the inlet of the hot water condenser, and is connected with high pressure air inlet of an electromagnetic pilot valve of the four-way valve; four functions of manufacturing hot water by utilizing water source or air energy and providing air-conditioning cool water by utilizing air-cooling or heating water can be realized by only switching the four-way valve, defrosting can be performed completely and quickly; and a water pre-heater is added to the device to reclaim the heat of waste hot water. The heat pump has the advantages of dual heat sources compensation and wide application range, has multiple functions, extremely simple structure, extremely convenient switching and over 5 of annual comprehensive energy efficiency ratio, and has great popularization value.

The invention relates to the technical field of air conditioning equipment, and in particular, discloses a double-temperature refrigerating and heating system, wherein a first cylinder, a first four-way valve, a first-grade throttle valve, an outdoor heat exchanger, a first-grade indoor heat exchanger, a gas-liquid separator, a second-grade throttle valve and a second-grade indoor heat exchanger of a compressor are connected through a pipeline to form a low-temperature evaporation loop; and a second cylinder, a second four-way valve, a first-grade throttle valve, an outdoor heat exchanger, a first-grade indoor heat exchanger and a gas-liquid separator of the compressor are connected through a pipeline to form a middle-temperature evaporation loop. The double-temperature refrigerating and heating system realizes switchover of refrigerating / heating modes through reversing of two four-way valves, realizes double-evaporation temperature refrigeration or double-condensation temperature heating, and effectively improves whole system energy efficiency; and obtained double-evaporation or double-condensation temperature can be widely applied to such places as freezing and refrigeration, air conditioner cold radiation and dehumidification, double-temperature heat source heat pump, air conditioner heat radiation and hot air or air conditioner heat radiation and living hot water.

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

The invention discloses an air-conditioner defroster. The defroster comprises a compressor, a four-way valve, an evaporator and a condenser. The defroster also comprises a first pipeline for connecting a liquid inlet of the evaporator with a liquid outlet of the condenser; a second pipeline for connecting an air return inlet of the evaporator with a first port of the four-way valve; a third pipeline for connecting an air inlet of the condenser with a second port of the four-way valve; a fourth pipeline for connecting an air outlet of the compressor with a third port of the four-way valve; a fifth pipeline for connecting a suction inlet of the compressor with a fourth port of the four-way valve; a bypass pipeline with one end communicated with the first pipeline and the other end communicated with the fourth pipeline; a bypass control valve arranged on the bypass pipeline for starting / closing the bypass pipeline; a throttle valve arranged on the first pipeline for regulating the flow of refrigerant in the first pipeline through adjusting the openness of the throttle valve. The invention combines the advantages of heat pump defrosting and hot gas bypass defrosting and can achieve the most effective defrosting.

An air conditioner in which a refrigeration cycle is configured by connecting a compressor, a four-way valve, a use-side heat exchanger, an expansion valve, and a heat-source-side heat exchanger. The air conditioner is also provided with: a hot gas bypass circuit that is connected between the discharge side of the compressor and in between the heat-source-side heat exchanger and the expansion valve; an on-off valve that opens / closes the flow path of the hot gas bypass circuit; and a control device that performs control such that either hot gas bypass defrosting operation or inverse cycle defrosting operation is selected according to the amount of frost formation on the heat-source-side heat exchanger, thereby performing defrosting operation. The control device, in the case of executing the hot gas bypass defrosting operation, performs control such that the on-off valve of the hot gas bypass circuit is opened, thereby partially supplying the refrigerant discharged from the compressor to the heat-source-side heat exchanger through the hot gas bypass circuit, and in the case of executing the inverse cycle defrosting operation, performs control to switch the four-way valve so that the refrigerant discharged from the compressor is supplied to the heat-source-side heat exchanger after passing through the four-way valve.

The invention discloses a fault detection method for an air conditioner, comprising: when the air conditioner is in a cooling state, obtaining the discharge temperature of the compressor and the temperature of the air port of the condenser after the four-way valve; If the air port temperature difference is higher than the preset value, it is determined that the air conditioner is faulty. The invention also discloses a fault detection system for an air conditioner, which includes a compressor, a four-way valve, a condenser, a throttling device and an evaporator, and also includes: a temperature sensor at the air port of the condenser, which is arranged between the four-way valve and the condenser on the pipeline between the compressors; the compressor discharge temperature sensor is arranged on the pipeline between the four-way valve and the compressor. The invention can accurately detect various faults in the working process of the air conditioner, so as to ensure the normal operation of the air conditioner.

The invention relates to a compressed-air energy-storage system. A three-position four-way valve is arranged in a pipeline of a compression part and an expansion part of the system and the flowing condition of air in the system is changed by utilizing the feature of change of a turn-on state of the three-position four-way valve, thus the variation of the manners of serial-connection and parallel-connection between a gas compressor and a turbine is realized, and the overall working efficiency is increased. With the adoption of the three-position four-way valve, on one hand, the overall flexibility of the compressed-air energy-storage system is improved, so that the operating of the system is more targeted, and the use of the compressed-air energy-storage system matched with various types of power stations is facilitated; and on the other hand, the service condition of turbomachinery is improved, and the optimized configuration of the turbomachinery according to the needs of energy storage and power generation can be realized.

An air conditioner comprising a refrigerant forward path branching on a discharge side of a compressor in an outdoor unit, one of the branched portions being defined by connecting a first four-way valve, a first outdoor heat exchanger and a first outdoor expansion valve to one another in this order, and the other of the branched portions being defined by connecting a second four-way valve, a second outdoor heat exchanger and a second outdoor expansion valve in this order, the path extending to an indoor unit from the respective outdoor expansion valves through a liquid-side piping, and returning to the outdoor unit from the indoor unit through a gas-side piping to branch, one of the branched portions being connected to the first four-way valve via a check valve placed in communication in a forward direction and the other of the branched portions being connected to the second four-way valve, the air conditioner being controlled such that, when heating operation is switched to defrosting operation, the second four-way valve is switched if a pressure difference between discharge pressure and suction pressure of the compressor is equal to or above a predetermined value, and the first four-way valve is switched after a gas-side pressure of the second outdoor heat exchanger has risen, whereby the four-way valves are prevented from being made inoperative due to short-circuit between high pressure side and low pressure side.

The invention discloses an air source heat pump type air conditioner and a defrosting method thereof. The air conditioner is outdoors connected with a first outdoor heat exchanger (4) and a second outdoor heat exchanger (5) in parallel, electromagnetic valves (6, 7, 8, 9) are respectively arranged on pipelines which connect the first outdoor heat exchanger (4) and the second outdoor heat exchanger (5) with a four-way valve (2), throttle devices (10, 11) are respectively arranged on the pipelines which are connected with an indoor heat exchanger (3), the electromagnetic valves (6, 7, 8, 9) are connected with a detection control system, and the throttle device (12) is connected between the first outdoor heat exchanger (4) and the second outdoor heat exchanger (5). When in need of defrosting, exhaust gas of a compressor is divided into two parts after passing through the four-way valve, one part enters the indoor machine for ensuring the indoor heat supply, the other part enters one of the outdoor heat exchangers for defrosting, condensate enters the other outdoor heat exchanger for evaporating after throttling, and refrigerant vapor returns to the compressor.

The invention provides a control method for increasing low-temperature heating heat of a varied-frequency air conditioner. After an outdoor electronic control chip of the air conditioner receives an instruction to start an indoor low-temperature heating mode, the method comprises the following steps: step 1: the outdoor electronic control chip responses outdoor ambient temperature and environmentrelative humidity so that the air conditioner can enters into a corresponding low-temperature heating running state; and step 2: after the air conditioner enters into a low-temperature heating running state, a compressor runs for a corresponding heating time according to a designated heating frequency, then the air conditioner enters into a defrosting operation and an outdoor heat exchanger of the air conditioner can be defrosted through reversing a four-way valve in the air conditioner, wherein before the defrosting operation in the step 2 and in the entire process of defrosting operation, the operation frequency and time of the compressor can be changed on condition that the compressor of the air conditioner keeps running all the time. The method provided by the invention can response the changes of ambient temperature and relative humidity and can effectively improve low-temperature heating heat of the varied-frequency air conditioner.

The invention discloses a hydro-pneumatic suspension system and a wheeled vehicle with the same. The hydro-pneumatic suspension system comprises a left suspension oil cylinder, a right suspension oil cylinder, a left change valve, a right change valve, a first hydraulic locking structure and a second hydraulic locking structure. The left suspension oil cylinder and the right suspension oil cylinder are respectively provided with a rod cavity and a rodless cavity. The left change valve and the right change valve are three-position four-way valves and are respectively provided with a first oil opening and a second oil opening, a pressure oil opening connected with a pressure oil source and an oil return opening connected with an oil tank. The first hydraulic locking structure is connected between the left suspension oil cylinder and the left change valve. The second hydraulic locking structure is connected between the right suspension oil cylinder and the right change valve. The left change valve and the right change valve are respectively provided with a first state, a second state and a third state, wherein the first state enables the first working oil opening and the second working oil opening to be connected to the oil return opening; the second state enables the first working oil opening to be connected to the oil return opening and the second working oil opening to be connected to the pressure oil opening; the third state enables the first working oil opening to be connected to the pressure oil opening and the second working oil opening to be connected to the oil return opening. In the invention, the hydro-pneumatic suspension system and the wheeled vehicle can realize the active lifting of vehicle axles under the nonload bearing state.

The invention discloses a control method of refrigerant flow of a multi-connected unit. The multi-connected unit comprises an outdoor unit, indoor units, a compressor and a four-way valve, wherein the outdoor unit is connected with the multiple parallelly-connected indoor units, and the outdoor unit is provided with an outdoor unit electronic expansion valve; and each indoor unit is provided withan indoor unit electronic expansion valve, and an air return part of the compressor, the middles and outlets of indoor unit heat exchangers, and an outlet of an outdoor unit heat exchanger are provided with temperature sensors. The opening control rule of the indoor unit electronic expansion valves is that after the initial opening is determined, the opening is adjusted by a difference value A obtained by subtracting the average temperature value of the current bootable indoor unit heat exchangers from the temperature value of the indoor unit heat exchangers, and the opening control rule of the outdoor unit electronic expansion valve is that after the initial opening is determined, the opening is adjusted by a difference value B obtained by subtracting the average temperature value of thecurrent bootable indoor unit heat exchangers or the outlet temperature value of the outdoor unit heat exchanger from the air return temperature of the compressor. The control method can effectively and automatically control the refrigerant flow among the indoor units of multi-connected central air conditioners.

The invention discloses an air-conditioner continuous heat-supply and defrost control method, based on an original four-way valve defrost control logic, control logics of hot air bypassing and an induced electricity heater are added in the method, when the defrosting is carried out in winter, the heat quantity can be supplied continuously to a room to ensure the comfortableness of the indoor environment, part of judgment conditions of the original control logic are modified, the begin and the end of the defrosting can be accurately judged and the systematic defrosting and heating can be effectively carried out, thereby greatly increasing the using comfortableness of air-conditioner users, enhancing the product using feelings of users, increasing the reliability of the air-conditioner system and having wide market application prospect.

The invention discloses an air source low-temperature heat pump water heater, comprising a main machine, a thermal storage heat insulating water tank, a controller, a four-way valve, a jet enthalpy increasing compressor, a high-pressure switch, a sleeve condenser, a reservoir, a drying filter, an electromagnetic valve, an assistant thermal expansion valve, an economizer, a main expansion valve, afin evaporator, a gas-liquid separator, a low-pressure switch and a check valve. The D direction of the four-way valve is connected with a gas discharging pipe of the jet enthalpy increasing compressor through the high-pressure switch, the C direction is connected with a gas inlet of the sleeve condenser, the S direction is connected with a gas absorbing port of the jet enthalpy increasing compressor through the gas-liquid separator and the low-pressure switch, the E direction is connected with a gas outlet of the fin evaporator, an outlet of the sleeve condenser is divided into two paths after passing through the reservoir and the drying filter, the main path directly enters the economizer and then enters a liquid inlet of the fin evaporator through a main thermal expansion valve, the secondary path enters the economizer through a liquid path electromagnetic valve and the assistant thermal expansion valve, and then enters an assistant gas inlet of the jet enthalpy increasing compressor through the check valve. The invention can ensure the supply of hot water all day in every season in northern places.

The invention relates to a simple, high-efficiency and reliable cold-warm air-conditioning water heater, which comprises a refrigerant loop, a hot-water condensing heat exchanger, a hot-water storing box and a signal acquisition and circuit control system. A scheme I of the invention is characterized in that: an exhaust opening of a compressor is connected with an air inlet of a three-way valve; a first air outlet of the three-way valve is connected with a refrigerant inlet of the hot-water condensing heat exchanger, and a second air outlet is connected and communicated with a first interfaceof a four-way valve and a refrigerant outlet of the hot-water condensing heat exchanger; a second interface, a third interface and a fourth interface of the four-way valve are respectively connected with the upper ports of an outdoor-wind heat exchanger and an indoor-wind heat exchanger and an air inlet of an air-liquid separator, and a capillary is connected in series between the lower ports of the outdoor-wind heat exchanger and the indoor-wind heat exchanger; an air outlet of the air-liquid separator is connected with an air inlet of the compressor; and an electromagnetic guide-valve low-voltage air-outlet pipe of the three-way valve is communicated with an air-sucking pipe of the compressor, and an electromagnetic guide-valve high-voltage air-inlet pipe of the four-way valve is communicated with an exhaust pipe of the compressor. A scheme II of the invention is characterized in that: the hot-water condensing heat exchanger is added between the exhaust opening of the compressor of a refrigerant-circulating loop of a cold and warm air conditioner and an air inlet of the four-way valve, and the electromagnetic guide-valve high-voltage air-inlet pipe of the four-way valve is communicated with the exhaust pipe of the compressor; and the two technical schemes both have four functions of hot-water making and refrigerating, hot-water making, refrigerating and heating.

The invention relates to an air conditioner and a defrosting control method thereof. According to the defrosting control method, whether defrosting control needs to be conducted or not is judged by the way of judging the relation between outdoor environment temperature and outdoor coiled tube temperature, and the optimization time point for entering in the defrosting control can be accurately judged. After the defrosting control is conducted, the frequency of a compressor is changed, and after switching frequency is reached, a four-way valve is directly switched to conduct defrosting control. After defrosting is completed, the frequency of the compressor is changed, and after the switching frequency is reached, the four-way valve is directly switched so that defrosting operation can be achieved. By means of the air conditioner and the defrosting control method thereof, the precision for entering in and exiting out of defrosting can be guaranteed, meanwhile, due to the fact that halting can not occur to the compressor in the defrosting process, heating capacity attenuation caused by halting of the compressor is reduced, the defrosting cycle is shortened, and the heating comfort and the heating performance of the air conditioner are improved.

The invention discloses an air source heat pump ultrasonic defrosting system, which relates to the defrosting system of the products such as household and commercial air source heat pump, etc. The invention comprises a compressor, a four-way valve, an indoor heat exchanger, a heating cone-way valve, a heating expansion valve, a refrigeration cone-way valve, a refrigeration expansion valve, an outdoor heat interchanger, and an air-fluid separator, wherein, the four-way valve is respectively connected with the compressor, the indoor heat exchanger, the outdoor heat interchanger and the air-fluid separator, the indoor heat exchanger is connected with the heating cone-way valve and the heating expansion valve, the heating cone-way valve and the heating expansion valve are connected with one end of the refrigeration cone-way valve and the refrigeration expansion valve through a pipeline, and the other ends of the refrigeration cone-way valve and the refrigeration expansion valve are connected with the outdoor heat interchanger. The invention is characterized in that an ultrasonic launcher and a temperature sensor are respectively arranged on the outdoor heat interchanger, and the ultrasonic launcher is connected with the temperature sensor through a controller. The invention realizes the purposes of improving the defrosting speed, reducing the energy consumption of the defrosting, and improving the operation efficiency of the heat pump.

The invention relates to an air conditioner using a combustible refrigerant and a control method thereof. The air conditioner comprises a refrigeration / heat pump air conditioner system which consists of a compressor, a four-way valve, an indoor heat exchanger, a throttle mechanism, and an outdoor heat exchanger, wherein two ends of the indoor heat exchanger are provided with an air conditioner connecting pipe pneumatic valve and an air conditioner connecting pipe hydraulic valve respectively; a refrigerant working medium concentration sensor is arranged indoors; a drain pipe branch and an automatic drain valve of the drain pipe branch are arranged on the connecting pipes of the outdoor heat exchanger; the refrigerant working medium concentration sensor is arranged beside the indoor heat exchanger; and the drain pipe branch and the automatic drain valve of the drain pipe branch are arranged on the pipes between the throttle mechanism and the outdoor heat exchanger. The air conditioner using the combustible refrigerant is provided with the refrigerant working medium concentration sensor, the drain pipe branch, and the automatic drain valve of the drain pipe branch, and when the combustible refrigerant working medium is detected to be leaked, an outdoor machine part exhausts the refrigerant to the large outdoor space to reduce the indoor leakage quantity, so personal injury and property loss generated when the indoor combustible working medium concentration reaches the combustion limit are avoided.