61results about How to "Improve low temperature heating performance" patented technology

The invention provides an outdoor unit of an air conditioner. The outdoor unit comprises a compressor, an outdoor heat exchanger, a first pipeline and an outdoor electronic expansion valve, wherein the first pipeline is used for connecting the indoor unit and the outdoor heat exchanger, the outdoor electronic expansion valve is connected in series onto the first pipeline, the compressor is a first double-rotor compressor, the first double-rotor compressor is provided with a first auxiliary air suction opening, a first main air suction opening and a first exhaust opening, the first main air suction opening is respectively connected with a four-way valve of the air conditioner, the outdoor unit also comprises a medium-pressure liquid storage tank positioned between the indoor unit and the outdoor electronic expansion valve, the medium-pressure liquid storage tank is connected in series onto the first pipeline and is provided with an air outlet, an inlet and a liquid outlet, the air outlet is connected with the first auxiliary air suction opening through a first auxiliary pipeline, and the inlet and the liquid outlet are respectively connected with the first pipeline. The outdoor unit of the air conditioner provided by the invention has the advantage that through the additional arrangement of the medium-pressure liquid storage tank and the adoption of the first double-rotor compressor, the low-temperature heating capability of the whole air conditioner is improved. The invention also provides the air conditioner, a heating air supplementing method of the air conditioner and a refrigeration air supplementing method of the air conditioner.

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 provides a compressor winding heating control method and device. The method comprises the following steps: the exhaust temperature of a compressor is obtained; and the heating current ofcompressor windings is adjusted according to the exhaust temperature. Through heating of the compressor windings, heat of refrigerants is absorbed to transfer to an indoor unit evaporator through thewindings, so that the low-temperature heating capacity is improved.

The invention provides an air conditioner defrosting control method and device, and an air conditioner. The air conditioner defrosting control method includes the steps that the outer pipe temperatureof the air conditioner is continuously acquired at a preset time interval; an acquired outer pipe temperature data set is compared with a preset temperature, when the acquired plurality of outer pipetemperature data meet the preset condition, the air conditioner is controlled to perform defrosting, and it is avoided that the phenomenon of frequent defrosting or defrosting without frost occurs, and heating comfort of the air conditioner is affected. By acquiring the outer pipe temperature data set, meanwhile the observation period on the air conditioner is prolonged, when the acquired plurality of outer pipe temperature data meet the preset condition, the air conditioner is controlled to perform defrosting, it is avoided that the phenomenon of frequent defrosting or defrosting without frost occurs, and heating comfort of the air conditioner is affected, and the precision of defrosting of the air conditioner without an outdoor environment temperature sensing device is improved.

The invention discloses a defrosting method of an air conditioner. The method is characterized in that after the air conditioner enters a defrosting state for t1, the minimum value of the indoor case temperature is searched and recorded, the indoor case temperature increases from the minimum value to the maximum value, and if the maximum value is more than a temperature Tp before defrosting, the defrosting method comprises the following two steps: 1) if the temperature decreases from the minimum value, the defrosting process lasts for t2; on the condition, if the minimum value of the indoor case temperature before defrosting is delta Tp less than Tp, the defrosting time is extended for t3; and 2) if the minimum value of the indoor case temperature does not decrease for t4 after the defrosting state lasts for t1, the defrosting process is completed; and on the condition, if the minimum value of the indoor case temperature before defrosting is delta Tp less than Tp, the defrosting time is extended for t5. The invention can accurately judge when the defrosting process is needed to finish and accurately quit the defrosting process, thus increasing the low temperature heating performance of the air conditioner.

The invention discloses an air-supplying enthalpy-adding heat pump air conditioning system capable of promoting the heat exchange performance of heat exchangers. The air-supplying enthalpy-adding heat pump air conditioning system capable of promoting the heat exchange performance of the heat exchangers comprises an air-supplying enthalpy-adding compressor, a four-way valve, an outdoor side heat exchanger, an indoor side heat exchanger, an air-liquid separator and a double-direction spiral flash vessel, an air outlet pipe is arranged on the side wall of a barrel of the upper section of the double-direction spiral flash vessel, and a first refrigerant inlet and outlet pipe and a second refrigerant inlet and outlet pipe which extend to an inner cavity of the barrel are arranged on the side wall of the barrel at the lower end; the air outlet pipe is connected with a first magnetic valve and an air-supplying opening of the air-supplying enthalpy-adding compressor in sequence and simultaneously connected with a second magnetic valve and the air-liquid separator in sequence, the first refrigerant inlet and outlet pipe is connected with a first expansion valve and the outdoor side heat exchange in sequence, and the second refrigerant inlet and outlet pipe is connected with a second expansion valve and the indoor side heat exchange in sequence. According to the air-supplying enthalpy-adding heat pump air conditioning system capable of promoting the heat exchange performance of the heat exchangers, not only can heating air-supplying be achieved, but also high-temperature refrigeration air-supplying can be achieved, on the normal temperature refrigeration working condition that air-supplying is not needed, the flash vessel serves as the air-liquid separator, the air phase ratio of refrigerant at an inlet of each heat exchanger is reduced, and the heat exchange performance of the heat exchangers is promoted.

The invention provides an air-conditioning outdoor unit condenser which comprises three rows of condenser components, an air inlet pipe assembly, an elbow, a three-way assembly, an air outlet assembly and a main outlet pipe, wherein the air inlet pipe assembly is located at the leeward side of the condenser, and the air outlet pipe assembly is located at the windward side of the condenser; and the condenser comprises a plurality of flow branches, each flow branch comprises two sequentially adjacent branch inlet routes, a plurality of U-shaped inner-thread copper pipes, elbows, three-way assemblies and one branch outlet route through connection, the quantity of the branch inlet routes is an even number, the quantity of the branch outlet routes is 1 / 2 of that of the branch inlet routes, and the bottommost part of the flow branch is the supercooling section of the condenser. The invention also provides an air-conditioning outdoor unit using the condenser. Experimental tests show that the rated heating capacity, the low-temperature heating capacity and the energy efficiency ratio of the air-conditioning outdoor unit using the condenser are greatly increased, and the heating quantity is increased by 5-10%.

The invention discloses an electronic expansion valve control method for prolonging the frosting period and an air conditioner. When the air conditioner is in a heating mode and the outdoor environment temperature is lower than a preset temperature threshold value, the air conditioner operates according to the following modes: the initial opening degree is set, the actual exhaust temperature is detected in real time, and the absolute value T of the difference between the actual exhaust temperature and the preset target exhaust temperature is calculated; when it is detected that the actual exhaust temperature is increased and T is decreased, T is compared with a preset temperature difference threshold value to determine the valve closing speed and the valve closing step number of an electronic expansion valve; when it is detected that T is lower than a stable operation threshold value, the electronic expansion valve stops acting; and when it is detected that the actual exhaust temperature is reduced and T is increased, T is compared with the preset temperature difference threshold value to determine the valve closing speed and the valve closing step number of the electronic expansion valve. Judgment and adjustment are conducted according to the actual exhaust temperature and the change condition of the absolute value of the difference between the actual exhaust temperature and the target exhaust temperature, and the low-temperature heating capacity can be effectively improved.

The invention provides a control method and device for heating a compressor winding. The method comprises the following steps: acquiring the outdoor environment temperature and the indoor temperature;and adjusting the heating current of the compressor winding according to the outdoor environment temperature and the indoor temperature. A refrigerant absorbs and transfers heat to an evaporator of an indoor unit through the winding as the compressor winding heats, so that the low-temperature heating capacity is improved.

The invention provides a method and device for controlling an expansion valve of an enhanced vapor injection system and a storage medium, and belongs to the field of electrical equipment. The method comprises the following steps that superheat degree changes of a jet opening of a compressor are detected; when the superheat degree is not in the preset range, the preset opening value of the auxiliary electronic expansion valve is increased or decreased; when the preset opening value of the auxiliary electronic expansion valve is increased, electric current of an air conditioning outdoor unit is detected; when the electric current is less than the preset electric current value, the preset opening value of the auxiliary expansion valve is increased again; when the electric current is greater than the preset electric current value, the frequency of the electric current is reduced until the electric current is less than the preset electric current value, and the preset opening value of the auxiliary expansion valve is increased again; and the above operation is repeated until the superheat degree is in the preset range. According to the above technical scheme, the superheat degree of the jet opening of the compressor can be made to be in the preset range, and excessive current of the outdoor unit is avoided.

The invention provides a method and a device for controlling the heating of a compressor winding. The method comprises the following steps: obtaining the power of a compressor; adjusting the heating current of the compressor winding according to the power. The invention can realize constant power control through the heating function of the compressor winding in the heating process of the defrosting cycle, thereby improving the low-temperature heating capacity.

The invention discloses a bi-directional spiral flash vessel applied to an air-supplementing and enthalpy-increasing heat pump air-conditioning system. The flash vessel comprises a barrel body, the barrel body comprises an upper-segment barrel body, an intermediate-segment barrel body and a lower-segment barrel body from top to bottom, an air outlet pipe is arranged on the side wall of the upper-segment barrel body, a first cooling agent inlet and outlet pipe and a second cooling agent inlet and outlet pipe which extend to an inner cavity of the barrel body are arranged on the side wall of the lower-segment barrel body, the portions, inserted into the barrel body, of the first cooling agent inlet and outlet pipe and the second cooling agent inlet and outlet pipe are spiral copper pipe portions both of which spirally extend upward clockwise or anticlockwise, and the two spiral copper pipe portions are assembled in a coiled mode so as to jointly form a gas-liquid separation device. By means of the bi-directional spiral flash vessel, the limit of unidirectional flow of an existing flash vessel is broken through, the bi-directional flowability is achieved, the air-supplementing and enthalpy-increasing system can be greatly simplified, meanwhile, the gas-liquid separation effect of the flash vessel is guaranteed and improved, and the bi-directional spiral flash vessel is applicable to an application occasion where the installation height of the flash vessel is limited and the specific value between the height and the diameter is small.

The invention relates to a high heat unit, and a method, system and air condition for controlling the unit. According to the invention, a condensation side inlet and an evaporation side inlet of an intermediate heat exchanger are both connected with an indoor heat exchanger. A condensation outlet of the intermediate heat exchanger is connected with an outdoor heat exchanger. The evaporation side outlet of the intermediate exchanger is connected with a gas liquid separator. A pipeline connecting the evaporation side inlet of the intermediate heat exchanger with the indoor heat exchanger is provided with a third throttling device. A second throttling device is arranged on a pipeline connecting a condensation outlet of the intermediate exchanger and the outdoor heat exchanger. According to the invention, by adopting a method of heating low-pressure side cold medium by utilizing the intermediate heat exchanger and by controlling the opening degrees of the throttling devices based on a specific logic, the integral evaporation pressure and the evaporation temperature of the system are improved, the cold medium heat energy after condensation is utilized effectively, the integral heat exchange volume of the unit is improved and the low temperature heating capability is enhanced.

The invention discloses a compressor and a heat exchange system comprising the same. The compressor comprises a shell, a liquid reservoir, a compressing mechanism, a medium-pressure air sucking pipe and a driving mechanism, wherein the shell is provided with a vent; the liquid reservoir is arranged outside the shell; the compressing mechanism is arranged inside the shell and comprises a rotary compressing structure and a reciprocating compressing structure; the rotary compressing structure is communicated with the liquid reservoir; the medium-pressure air sucking pipe is arranged outside the shell and is communicated with the reciprocating compressing structure; the driving mechanism is arranged inside the shell and is in transmission connection with the rotary compressing structure and the reciprocating compressing structure respectively. The compressor disclosed by the invention is good in heating effect at low temperature, high in running efficiency, also simple in structure, low in production cost and high in performance-to-cost ratio.

The invention provides a low-temperature air conditioning system and an air conditioner. The low-temperature air conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger and a throttling device; a first valve port of the four-way valve is connected with the compressor; a second valve port of the four-way valve is connected with the indoor heat exchanger; and a third valve port of the four-way valve is connected with the outdoor heat exchanger. The low-temperature air conditioning system further comprises an auxiliary heat exchanger connected with the outdoor heat exchanger, a first separator, a first valve and a second valve, wherein a first port of the first separator is connected with the auxiliary heat exchanger; a second port of the first separator is connected with the indoor heat exchanger; a third port of the first separator is connected with the outdoor heat exchanger, is connected with the second port in parallel, and is communicated with the indoor heat exchanger; the first valve is arranged on a pipeline for communicating the second port of the outdoor heat exchanger with the third valve port of the four-way valve; and the second valve is arranged on a pipeline for communicating the third port with the third port of the indoor heat exchanger. The low-temperature air conditioning system can control the refrigerant circulating quantity to enhance the low-temperature heating effect thereof.

The invention discloses a heat exchanger, which comprises a first collecting pipe, a second collecting pipe, a plurality of flat tubes and a plurality of groups of fins, wherein the first collecting pipe and the second collecting pipe are the same in axial directions and vertical directions; two ends of each flat tube are respectively connected with the first collecting pipe and the second collecting pipe, so that a refrigerant passage in the flat tube is respectively communicated with the first collecting pipe and the second collecting pipe, and each flat tube is not provided with a horizontal surface; the fins are provided with parts matched with the cross section shapes of the flat tubes, and are arranged at intervals along the length direction of the flat tubes. According to the heat exchanger of the embodiment of the invention, defrosted water of the heat exchanger cannot accumulate and stay on the surfaces of the flat tubes, but can flow along the surfaces of the flat tubes and drip onto the ground, so that a freezing problem of the flat tubes is avoided, the heat exchanger is enabled not to froze easily, the defrosting time of the heat exchanger is also shortened, frequent start of the defrosting mode of an air conditioner is avoided, and the low temperature heating effect and the working efficiency of the heat exchanger are improved.

The invention discloses an air conditioner and a control method thereof. The air conditioner comprises an outdoor heat exchanger, a four-way valve, a compressor, an indoor heat exchanger and a throttle valve, wherein the throttle valve is in tandem connection between the indoor heat exchanger and the outdoor heat exchanger and has two gears with different flows. The air conditioner control method comprises the following steps: presetting a first frequency F1 and a second frequency F2 of a compressor in the refrigeration cycle of the air conditioner; when the air conditioner operates, carrying out step 1: detecting the operation mode of the air conditioner and the operation frequency f of the compressor, if the refrigeration cycle is obtained, entering into step 2, and if heating cycle is obtained, entering into step 5; and carrying out step 2: comparing the operation frequency f with the first frequency F1, if the operation frequency f is more than or equal to the first frequency F1, entering into step 3, and if the operation frequency f is less than the first frequency F1, entering into step 4. The invention has the characteristics of simple and reasonable structure, flexible operation, low manufacturing cost and wide applicable range.

The invention discloses an air conditioner system and an economizer electronic expansion valve control method. The air conditioner comprises a compressor, an outdoor heat exchanger, a use-side heat exchanger, an economizer, a four-way valve, an economizer electronic expansion valve, a control unit, a use-side discharge water temperature sensor, an outdoor temperature sensor, an economizer electronic expansion valve downstream temperature sensor and a compressor rotation speed sensor, wherein the use-side discharge water temperature sensor, the outdoor temperature sensor, the economizer electronic expansion valve downstream temperature sensor and the compressor rotation speed sensor are connected with the control unit. The air conditioner system has the advantages that by collecting use-side discharge water temperature, outdoor temperature, economizer electronic expansion valve downstream temperature and compressor rotation speed and using a two-dimensional fuzzy controller to control the opening degree of the economizer electronic expansion valve, and the system gets rid of the dependence of the prior art on superheat degree; the system does not depend on the superheat degree, control stability of the economizer electronic expansion valve is achieved, low-temperature heating ability can be increased effectively, energy efficiency ratio can be increased evidently, and the system's adaptability to various working conditions is increased.

The invention discloses a non-azeotropic working medium hot pump system with adjustable concentration and a running method thereof. The system mainly includes a compressor, a four-way valve, an outdoor heat exchanger, a flow direction switching device, a component regulating device, a system expansion valve and an indoor heat exchanger. Through arranging the component regulating device, the component separating tank, the corresponding linking pipe and the valve, the quasi-second-grade compression, fluid injection and system working medium concentration adjustment and other functions can be realized. Through the comprehensive application of the non-azeotropic working medium, gas supplementation, and component concentration adjusting technology, the hot pump system can improve the heating amount and COP of the hot pump under the low-temperature condition, improve the seasonal energy efficiency level of the hot pump device, and effectively control the exhaust temperature of the compressor under the low-temperature working condition.

The invention discloses a thermal management system used for an electric automobile. The thermal management system comprises an air conditioner heat pump system and a battery and motor heat conductionsystem. The air conditioner heat pump system comprises a compressor, a compartment condenser, a first extra-compartment heat exchanger, a compartment evaporator, a first heat exchanger, a heat accumulator, a gas-liquid separator and multiple valve bodies. The battery and motor heat conduction system comprises a battery heat exchange module, a motor heat exchange module, a liquid pump, a second extra-compartment heat exchanger, a second heat exchanger and multiple valve bodies. The air conditioner heat pump system and the battery and motor heat conduction system store and exchange energy through the heat accumulator and the first heat exchanger. Various thermal management modes of refrigerating, heating, dehumidification, heat dissipation of a battery and a motor and the like of the electric automobile can be achieved, and on the foundation that energy is saved, the comfort of a compartment and the safety of the battery and the motor are guaranteed.

The invention discloses a rectifying tower type variable concentration non-azeotropic working medium hot pump system and a running method, and belongs to the technical field of a hot pump air conditioner. The system mainly includes a compressor, a four-way valve, an outdoor heat exchanger, a flow direction switching device, a component regulating device, a stored fluid heat regenerator, a system expanding valve, an indoor heat exchanger, a three-way valve and a corresponding linking pipe. Through arranging the component separating tank, the system storage fluid heat regenerating tank, the corresponding linking pipe and the valve, the quasi-secondary-grade compression, fluid injection, concentration adjustment of system working medium and other functions can be realized. Through the comprehensive application of non-azeotropic working medium, gas supplementation, injection and component concentration adjusting technology, the hot pump system can improve the heating amount and COP of the hot pump under the low temperature condition, increase the seasonal efficiency level of the hot pump device, and effectively control the exhaust temperature of the low-temperature condition of the compressor.

The invention discloses a low-temperature heating refrigerant flow rate matching control method and an air conditioner. The low-temperature heating refrigerant flow rate matching control method comprises the following steps that S1, the air conditioner enters a heating mode, whether a condition of entering defrosting control is achieved or not is judged, and if the condition is achieved, S2 is executed; S2, the air conditioner performs defrosting operation, when defrosting is finished, an electronic expansion valve recovers an initial opening degree, defrosting timing is started, and after thedefrosting time is achieved with defrosting timing, S3 is executed; S3, valve regulation timing is started; S4, after a regulation time of the expansion valve is achieved with regulation timing, theelectronic expansion valve performs one-step valve closing, and whether the opening degree of the electronic expansion valve is declined to a lower limit opening degree or not is judged, and if the opening degree of the electronic expansion valve is not declined to the lower limit opening degree, S5 is executed; S5, whether the condition of entering defrosting control is achieved or not is judged,and if the condition is achieved, S6 is executed; S6, the opening degree of the electronic expansion valve is kept invariable; and S7, when the condition of entering defrosting control is achieved ornot is judged, the step S2 is executed, or otherwise, the step 6 is executed. By adopting the low-temperature heating refrigerant flow rate matching control method provided by the invention, the refrigerant flow rate in the defrosting process and the heat exchange ability of an evaporator perform dynamic matching, the low-temperature heating ability is improved, the defrosting period is prolonged, the energy consumption is lowered, noise pollution is reduced, and the use comfort is improved.

The invention discloses a cascade type refrigerating and heating energy-saving system comprising two air source modules, at least one screw heat source unit, a screw heat source unit water supply pump, an air conditioning system circulating pump, a thermal energy buffer water tank, a heat supply remote transmission main meter and a microbubble exhaust dirt separator. Water ways of the two air source modules are arranged in a series connection manner and are both connected with the thermal energy buffer water tank, and generated thermal energy can be transferred to the thermal energy buffer water tank. The cascade type air source / water source heat pump heating system can operate in multiple working condition modes especially low-temperature severe environments, system operation is stable, and energy efficiency is high. The heating system can efficiently operate under wider temperature environment intervals, and switching of various operation modes can be achieved.

The invention discloses an air-conditioner and a control method thereof. The air-conditioner comprises an outdoor heat exchanger, a four-way valve, a compressor, an indoor heat exchanger and a throttling device, wherein the throttling device is in tandem connection between the outdoor heat exchanger and the indoor heat exchanger. The air-conditioner is characterized in that the throttling device comprises a multi-ported valve and more than two throttling elements with different flow rates, wherein the multi-ported valve is provided with a switching mechanism; more than three ports are arranged on the multi-ported valve; one end of the more than two throttling elements with different flow rates is respectively communicated with two of the more than three ports; the other end of the more than two throttling elements with different flow rates are connected in parallel and then are communicated with the indoor heat exchanger; the rest of the more than three ports is communicated with the outdoor exchanger. The invention has the characteristics of simplicity and reasonability, flexible operation, low cost and wide application range, can effectively improve the energy efficiency of the air-conditioner, and simultaneously improve the maximum operational capability and low-temperature heating capability of the air-conditioner.

The invention relates to the field of air conditioner control, and provides a refrigerant flow control method for solving the problem that during low-temperature heating of a frequency conversion heatpump air conditioner, control over the refrigeration flow and the heat exchange capacity of an outdoor heat exchanger are not matched. The method comprises the steps that S1, after heating begins, whether the outdoor heat exchanger reaches the defrosting control condition or not is judged, if yes, the S2 is executed; S2, defrosting operation is carried out, after the defrosting is finished, an expansion valve is controlled to be recovered to the initial opening degree, the frosting time and the running duration after defrosting begin to be subjected to time keeping, and the S3 is executed; S3, when the frosting time reaches the preset frosting time, the S4 is executed; S4, valve adjusting time begins to time keeping, when the pressure adjusting time reaches the preset valve adjusting time, the opening degree of the expansion valve is controlled, the preset opening degree interval is reduced, the running duration after defrosting is subtracted from the preset valve adjusting time, andthe result is divided by the preset coefficient; S5, whether the outdoor heat exchanger reaches the defrosting control condition or not is judged, if yes, the S2 is executed, if not, the S4 is executed. The method is suitable for the control over the low-temperature heating mode of the frequency conversion heat pump air conditioner.

The invention discloses a refrigeration system. The refrigeration system includes: a compressor, an evaporator, a condenser, a first four-way reversing valve, a second four-way reversing valve and an intercooler. The compressor includes a first cylinder, a second Two cylinders and injection passages, the first cylinder is provided with the first air return port and the first exhaust port respectively communicated with the cylinder chamber of the first cylinder, and the second cylinder is provided with the second cylinder chamber respectively communicated with the cylinder chamber of the second cylinder Two air return ports and the second exhaust port; the air injection port communicates with the cylinder chamber of the first cylinder through the injection channel; a first throttling device is provided between the evaporator and the condenser; the first four-way reversing valve includes the first to The fourth valve port; the second four-way reversing valve includes fifth to eighth valve ports. By setting the injection channel, the low-temperature heating capacity of the refrigeration system can be improved, the energy efficiency of the refrigeration system can be improved, and thus the working efficiency of the refrigeration system can be improved.

The invention discloses a rotary compressor and a heat exchange system with the same. The rotary compressor comprises a shell, a liquid storage device, a compressing mechanism, an enthalpy increasing pipe and a switching device which can switch between a full load condition and a partial load condition, wherein the compressing mechanism is arranged in the shell and comprises a main bearing, an auxiliary bearing, a first air cylinder and a second air cylinder; the first and second air cylinders are arranged between the main and auxiliary bearings and are separated by a clapboard; the first air cylinder is internally provided with a first compression chamber; the compressing mechanism is provided with an air nozzle, a first exhaust port and a first air suction port; the air nozzle and the first exhaust port are respectively communicated with the first compression chamber; the first air suction port is communicated with the liquid storage device and the first compression chamber respectively; the second air cylinder is internally provided with a second compression chamber; the compressing mechanism is provided with a second air suction port and a second exhaust port, which are communicated with the second compression chamber; the enthalpy increasing pipe is arranged outside the shell and is communicated with the air nozzle and the second air suction port respectively. The rotary compressor has high operation efficiency, a wide range of application and good low temperature heating effects.

The invention discloses a thermal management system for an electric vehicle, which includes an air-conditioning heat pump system and a battery motor heat conduction system; the air-conditioning heat pump system includes a compressor, a cabin condenser, a first external heat exchanger, a cabin evaporator, The first heat exchanger, heat accumulator, gas-liquid separator and several valve bodies; the battery motor heat transfer system includes battery heat exchange module, motor heat exchange module, liquid pump, second external heat exchanger, second heat exchanger and a number of valve bodies; the air-conditioning heat pump system and the battery motor heat conduction system store and exchange energy through the heat accumulator and the first heat exchanger. The invention can enable the electric vehicle to realize various heat management modes such as cooling, heating, dehumidification, heat dissipation of the battery and the motor, and ensure the comfort of the cabin and the safety of the battery and the motor on the basis of saving energy.

The invention discloses a multi-connection system, an outdoor machine component and a control method thereof. The outdoor machine assembly includes: a compressor, a reversing assembly, an outdoor heat exchanger, a control valve and a first stop valve, and the compressor has an exhaust port and an air return port. The reversing assembly includes first to fourth interfaces, the first interface is connected with the exhaust port, the fourth interface is connected with the air return port, and the second interface is suitable for being connected with the indoor unit combination. The first end of the outdoor heat exchanger communicates with the third interface. The control valve is connected with the second end of the outdoor heat exchanger. The first stop valve communicates with the first end and the third port of the outdoor heat exchanger respectively. According to the outdoor unit assembly of the embodiment of the present invention, the frequency of the compressor can be reduced while meeting the demand for cooling and heating, and the energy efficiency of the system can be improved to reduce the operating cost. It can also effectively improve the low-temperature heating capacity, reduce the defrosting time, and improve User comfort.