6268results about How to "Improve operational reliability" patented technology

The invention discloses a mahjong machine, a mahjong tile jacking component and a method for settling mahjong tiles. A mahjong tile storage slot of the mahjong tile jacking component is bent in an arc-shaped form and the bending angle is greater than 180 degrees; the mahjong tile jacking component is equipped with a first arc-shaped mahjong tile storage part and a second mahjong tile storage part in different bending radiuses; the mahjong tile jacking component comprises a mahjong tile pushing slide block base, a mahjong tile pushing block and a mahjong tile jacking push rod which are arranged on a mahjong tile jacking bracket; the mahjong tile pushing slide block base is driven to rotate around a fixed point by a mahjong tile jacking motor; a mahjong tile pushing slide block is in sliding connection with the mahjong tile pushing slide block base; the mahjong tile jacking push rod is fixedly connected with or integrally manufactured with the mahjong tile pushing slide block; a mahjong tile jacking push head is arranged on the mahjong tile jacking push rod; a cam slot matched with the mahjong tile pushing slide block is formed on the mahjong tile jacking bracket. According to the scheme, four sets of mahjong tile picking carrying systems of the mahjong machine are respectively and independently arranged and are not intersected with each other; a structure without a mahjong tile rotating device or stacking head is adopted, so that the problems that the stacked mahjong tiles are pushed bias, are tightly blocked and cannot be pushed into the mahjong tile storage slot can be avoided; the height of the main frame of the mahjong machine and the manufacturing cost are lowered; the usage experience and comfort level are higher.

The invention discloses a microgrid real-time energy optimizing and scheduling method in a parallel running mode. The method comprises the following steps of: firstly, dividing 24 hours in a day into a peak period of time, a general period of time and a trough period of time according to the load condition of a large power grid; and then, monitoring the working state of an accumulator in a microgrid in real time in the real-time process of the microgrid and adopting different energy optimizing strategies according to different periods of time and different working states of the accumulator soas to confirm the active power output of various schedulable micro power supplies, the charging and discharging power of the accumulator and scheduling instructions of the active power interactive with the power grid and the passive power of a passive adjustable power supply in the microgrid. The microgrid suitable for the invention comprises a reproducible energy generator, the schedulable micropower supplies and the accumulator. The invention not only can improve the economy and the reliability of the microgrid, but also can help the great power grid to cut peaks and fill troughs and is favorable to prolonging the service life of the accumulator.

A smart electricity meter with a function of monitoring and protecting power failure comprises a metering chip, a leakage current sampling circuit, a phase current sampling circuit, a phase voltage sampling circuit, a CPU (central processing unit), a power module and a low voltage breaker. The leakage current sampling circuit is electrically connected with the metering chip which is mutually electrically connected with the CPU. The CPU is electrically connected with the low voltage breaker through a trip output port. The low voltage breaker is electrically connected with the CPU through a status acquisition interface. The invention further provides a power failure monitoring and controlling method of the smart electricity meter. The smart electricity meter has the advantages that the reliable power module for power failure protection and control is provided, various types of power failure warning and protection are provided, failure warning and failure protection for voltage, current, power and the like are achieved for power users, failure spots are prevented and isolated, economic loss and personal safety accidents due to failure of electric circuit equipment of the users are prevented and reduced, and reliability of low voltage grids is effectively improved.

The invention provides a method and a device for collecting carbon dioxide in smoke gas of a coal-fired power plant. The device consists of a smoke gas pretreatment system, absorption towers, a regeneration tower, an exhaust scrubbing system, a solution heating recoverer, a product gas processing system (comprising a condenser, a gas-liquid separator and a compressor). The device is integrated with the prior smoke gas purification device of the coal-fired power plant, and is provided with a high-efficiency whirlcone and a chemical absorption system, so that mass carbon dioxide gas exhausted from a coal-fired boiler can be collected, and the emission of greenhouse gas can be reduced; the special arrangement of double absorption towers ensures more flexible operation of a collecting system, and improves the operational reliability; an absorption solution reclaiming process reduces the consumption of the solution; the arrangement of a lean-rich solution heat exchanger and a product gas rich solution heat exchanger reduces the energy consumption of the collecting system; and the steam consumption can be effectively reduced by adopting a built-in solution boiling unit.

The invention relates to an intelligent monitoring system for a boiler and a heat exchange station and a method thereof, which belong to the technical fields of production monitoring and security management. The system comprises a main system in a central control room, a plurality of boiler monitoring subsystems which are respectively connected with the main system in the central control room and a plurality of heat exchange station monitoring subsystems. The method comprises the following steps: parameters and video signals on site are collected and transmitted in real time and transmitted to a host machine in the central control room after being converted and compressed; the host machine carries out comprehensive processes of intelligent analysis, dynamic display, prewarning and warning and management for the received signals and transmit control commands to the monitoring subsystems to carry out control; and the monitoring subsystems can be cooperated with the central room to carry out monitoring or independently carries out monitoring to realize automatic control. The invention can realize real-time and dynamic intelligent control, prewarning and warning, security management and automatic monitoring for a large boiler or a boiler group and a heating network system and has the advantages of energy saving, consumption reduction, comprehensive analysis, safety, stability and economic operation.

The invention relates to a micro power grid system and a control method thereof, in particular to an alternating current and direct current hybrid micro power grid system and a control method thereof. The micro power grid system comprises an alternating current micro power grid system and a direct current micro power grid system, wherein an alternating current interface of the alternating current micro power grid system is connected to a micro power grid alternating current bus; and a direct current interface of the direct current micro power grid system is connected to a micro power grid direct current bus. The scheme provided by the invention is applied to the micro power grid system which is formed by connecting various distributed new energy sources, an alternating current load, a direct current load, an energy storage system and the like through power electronic devices and a micro power grid network and operates independently, the system meets the different power requirements of users, alternating current power supply and direct current power supply are realized, and reliable power is supplied to the loads. The system contributes to the design, control, operation and maintenance of an alternating current and direct current hybrid micro grid, and the power supply reliability, economy and efficiency of the micro power grid are effectively improved by the control method of the system.

The invention discloses an intelligent battery management system which comprises a plurality of basic units, slave control modules and a master control module, wherein the slave control modules are used for detecting the states of batteries in the corresponding basic units at regular time and transmitting the detection data to MCUs (Microprogrammed Control Units) in the slave control modules, the MCUs of the slave control modules transmit the detection data to the MCU in the master control module, the MCU in the master control module judges the state of each battery according to the received information, correspondingly controls each battery and transmits a control instruction to the MCUs in the slave control modules, and the MCUs in the slave control modules execute the instruction. The intelligent battery management system enables each battery to evenly discharge and to be fully charged in the charging process, thereby eliminating the short-board phenomenon, prolonging the service life of each battery, increasing the energy efficiency of each battery and improving the operation reliability of the system.

A thermoelectric apparatus is composed of a heat-absorbing-side heat-exchanging base and a heat-dissipating-side heat-exchanging base having good thermal conductivity and arranged in a mutually opposing relationship with a group of thermoelectric elements interposed therebetween. The thermoelectric apparatus comprises a frame made of a synthetic resin material and holding one of the heat-absorbing-side heat-exchanging base and the heat-dissipating-side heat-exchanging base at an outer peripheral portion thereof. The frame and the other heat-exchanging base, which is not held by the frame, are both provided with extended portions extending substantially along and substantially in the same direction as a stacked direction of the heat-absorbing-side heat-exchanging base, the group of thermoelectric elements and the heat-dissipating-side heat-exchanging base. The extended portions are joined together.

A stator (1, 10) for a rotary electrical machine, includes a stator core (2) in a cylinder shape and having plural magnetic pole teeth (22), which are arranged in a circumferential direction of the stator while keeping a distance therebetween and each of which protrudes in a radial direction of the stator core, a coil (3) configured with a conductive wire wound around each of the magnetic pole teeth, an insulating bobbin (5) provided between the coil and the corresponding magnetic pole tooth, and an electric power supply portion (6, 60) arranged axially outwardly of the stator core, electrically connecting the coil with an outside of the stator, and including an outgoing wire (7U1, 7U2, 7U3, 7U4, 7U5, 7V1, 7V2, 7V3, 7V4, 7V5, 7W1, 7W2, 7W3, 7W4, 7W5), which corresponds to a portion of at least one of a winding start and a winding end of the conductive wire being extended by a predetermined length, and an isolating member (8, 80) having a groove portion (86U, 86V, 86W, 96U, 96V, 96W) for accommodating and guiding the corresponding outgoing wire.

The invention discloses a state monitoring and failure diagnosis method for a wind generating set variable pitch system. The method includes the steps that 1, in data collection, operation parameters related with the operation state of the variable pitch system are extracted from a wind generating set SCADA system; 2, according to feature parameter extraction, a Relief algorithm is utilized for extracting effective feature parameters of the variable pitch system; 3, in data analysis and prediction, historical data during normal operation of the variable pitch system are screened out to establish a health model of a fan and calculate the prediction value of a real-time signal and the difference between an actual output value and the prediction value; 4, according to a diagnosis algorithm, the operation state of the fan is judged according to residual error information transmitted by the step 3, and the main failure reason of the variable pitch system is found according to a corresponding diagnosis rule and the contribution rate of residue errors; 5, according to data storage, real-time data, prediction data and the diagnosis result are stored to facilitate failure analysis at the later period and provided as reference data for modifying the failure diagnosis rule.

The invention provides a tiled display control system based on a cloud computing technology, an image display method adopting the system and an application of the system. The system comprises a plurality of displays, a plurality of distributed cloud registration controllers, a plurality of exchangers and system software, wherein a jointing wall is formed by the plurality of displays; an LAN (Local Area Network) is formed by cascading the plurality of exchangers, and a framework core of an IP (Internet Protocol) network is formed by a transmission channel for providing data and control commands; the plurality of distributed cloud registration controllers are accessed into the exchangers of the corresponding levels, and are connected with the corresponding displays through video connecting wires, and the cloud registration controller adopts a PCI-E (PCI Express) base-plate and is provided with an Inter processor. A plurality of data (IE) windows can be displayed on an assembled display simultaneously by adopting the performance of a flexibly configured server and an output channel of the system, and can be interacted in real time; furthermore, the tiled display control system has the functions of video decoding, server memory and the like after the system is applied to a video conference system; compared with the traditional scheme, the system has the advantages of high performance, high reliability, high development, low cost, information processing, strong analysis and management capacities, high resolution ratio, high performance cost ratio, real-time display, green environmental protection and the like.

The invention provides a hydrotreating device which comprises a hydrotreating protection unit and a main hydrotreating unit, which are connected with each other in series, wherein the hydrotreating protection unit comprises a main hydrotreating protection reactor and a spare hydrotreating protection reactor, which are connected with each other in parallel, and the volume of the main hydrotreating protection reactor is larger than that of the spare hydrotreating protection reactor. The invention further provides the application of the hydrotreating device and a residual oil hydrotreating method. The method comprises the following steps of: introducing the residual oil and the hydrogen into the hydrotreating device, and alternately using the main hydrotreating protection reactor and the spare hydrotreating protection reactor in the process of hydrotreating, wherein the online time of the main hydrotreating protection reactor is longer than that of the spare hydrotreating protection reactor. The method provided by the invention is particularly suitable for machining the high-carbon content residual oil and the high-metal content residual oil. Furthermore, the bigger hydrotreating protection reactor is longer in online time, so that the invention is higher in reactor use ratio.

The invention discloses an upper cover assembly of an electric pressure cooker and the electric pressure cooker with the upper cover assembly. The upper cover assembly comprises an upper cover body, a rotating chuck, a plurality of fasteners, a plurality of support posts and stop gaskets, wherein the rotating chuck is pivotally connected with the upper cover body; a clamping groove is formed in the rotating chuck; the plurality of support posts are connected with the corresponding fasteners, are matched in the clamping groove, are propped against the clamping groove when the rotating chuck rotates, and move long the radial direction of the rotating chuck to drive the fasteners to be fastened to or separated from an outer pot; the stop gaskets are fixed at the upper ends of the support posts; and the sizes of the stop gaskets are greater than the width of the clamping groove in the width direction of the clamping groove. The upper cover assembly of the electric pressure cooker is good in operation smoothness and high in stability, the support posts are not easy to damage and the service life is relatively long.

A wireless sensor network gateway unit is proposed, which is designed for integration to a wireless sensor network (WSN) for providing a gateway function with a failed link auto-redirecting capability for the wireless sensor network. The proposed WSN gateway unit is characterized by the provision of an failed link auto-redirecting capability, which can respond to the failure of any sensor node in the WSN system by performing a failed link auto-redirecting operation for redirecting the down-linked good sensor nodes for linking to a nearby good sensor node to thereby allow the down-linked good sensor nodes to be nevertheless able to transfer data to the WSN gateway unit of the invention. This feature allows the WSN gateway unit of the invention to maintain good operational reliability for the WSN system.

The invention provides an air conditioner operation method. The air conditioner operation method comprises the steps that S100, whether self-cleaning processing needs to be conducted on a heat exchanger or not is judged, when it is judged that self-cleaning processing needs to be conducted, S200 is continuously conducted, or else, S300 is directly executed; S200, an air conditioner is started and adjusted to a refrigeration mode to conducted self-cleansing processing on the heat exchanger, and a draught fan is made to run in the self-cleaning processing process to prevent the surface of the heat exchanger from icing; S300, the air conditioner is restarted and enters the working mode set by a user. By means of the air conditioner started through the air conditioner operation method, condensation of water in air is achieved on the surface of the heat exchanger through refrigeration, dust, bacteria and the like which exist on the heat exchanger are taken away through condensate water, residual water in the heat exchanger can be dried through the draught fan, and therefore normal running of the air conditioner can be guaranteed.

A transformer heat exchanger adopts the evaporative cooling technology, wherein transformer oil (80) enters into an oil chamber (85) through an oil inlet flange (110), and then flows out from an oil outlet flange (70) after exchanging heat with evaporating liquid (90) through a metal heat exchange tube (20), the evaporating liquid (90) is filled into a space which is formed by a liquid-collecting space (50) and the metal heat exchange tube (20), then is continuously heated up by heat transformer oil (80), and can absorb heat energy after boiling and vaporizing to generate phase change, thereby realizing the purposes of heat absorbing and cooling. Evaporating liquid steam which is generated through vaporizing upwards enters into a gas-collecting space (120) through the metal heat exchange tube (20), flows out the heat exchanger through a gas outlet flange (130), regenerates the phase change into liquid through the secondary cooling, and then returns to the liquid-collecting space (50) through a pipe, thereby finishing the circulation. The invention can increase the heat exchange efficiency, can not generate the transformer insulation accidents, even if the evaporating liquid leaks into the transformer oil owing to the higher electric insulation level of the evaporating liquid, thereby avoiding safety hidden dangers caused by the accident.

The invention provides a motion control system and method for electrically-driven a hexapod robot, relates to the field of motion control of hexapod robots, and aims to overcome the defects that a robot is usually low in independent flexibility, low in integral adaptability, low in motion control response speed, strong in dependence on the work environment and the like, and to solve the problem that complexity of the control system is increased because of various degrees of freedom. The control system comprises a foot-type module and a wheel-type module, and the control system is carried out according to the following steps particularly: 1, building a hexapod robot modeling module; 2, building a coordinate system calculating module; 3, controlling a servo motor through a motion controller for accurate position movement, and determining variation of the mass center of a robot platform through a posture motion module by applying a robot coordinate transforming matrix; 4, realizing moving forwards, retreat, left turn, right turn and the like of a wheel-type system. The control system and the control method are applied to the field of motion control of the hexapod robot.

The invention relates to a monitoring system and method for distributed charging piles. The monitoring system comprises a monitoring center, a partition monitor terminal and a charging pile local monitoring system, wherein the monitoring center is used for intensively controlling the charging piles and the operation state thereof, integrally controlling and transmitting time division or real-time electrovalence information of the charging piles, and collecting and managing electric energy charging information of the charging piles; the partition monitor terminal is used for intensively collecting and storing the data of a plurality of charging piles distributed dispersedly in a certain area, forwarding the data to the monitoring center according to the preset mode, and forwarding a monitor command given by the monitoring center to the charging piles; and the charging pile local monitoring system is used for monitoring, managing and protecting the charging process of the charging piles, measuring and charging the charging electric energy, collecting and uploading the charging pile information, as well as the operation state information and the measuring and charging information of the charging piles to the partition monitor terminal, and receiving and carrying out the monitoring command given by the monitoring center. In the invention, the electric automobile charging piles distributed dispersedly can be effectively and conveniently controlled, the reliability of the charging piles can be improved, the operation and maintenance cost of the charging piles can be reduced, and the center data storing burden can be reduced.

The invention discloses an electric vehicle-mounted terminal based on cloud computing and a using method thereof. The electric vehicle-mounted terminal comprises a cloud client, a communication module, a human-machine interaction module, a positioning module, an identity identification module, an electric energy metering module, a charge / discharge control module and a CAN (controller area network) data interface. The cloud client is connected with the identity identification module, the positioning module, the human-machine interaction module, the communication module, the electric energy metering module, the charge / discharge control module and the CAN data interface respectively; a cloud server is connected with the communication module; an identity identification card and a vehicle identification card are both connected with the identity identification module; an electric energy meter is connected with the electric energy metering module; and a vehicle information system and a battery management system are both connected with the CAN data interface. Through the invention, the operation reliability of the vehicle-mounted terminal is improved; more personalized services are expanded; the structure and layout of the vehicle-mounted terminal are simplified, and the expandability of the vehicle-mounted terminal is improved; and the user does not worry about data loss, virus invasion and the like, and convenience is provided to the managers in finding the problems of the vehicle and battery in time.

The invention provides a method for preparing industrial lithium carbonate by using salt lake brine with a high magnesium-to-lithium ratio. In the method, a TBP-CON-KS+FeCl3 is used as an extraction system to extract and back-extract impurity-free salt lake brine with a high magnesium-to-lithium ratio, the residual liquid obtained after back-extraction is converted by alkaline liquor for precipitation, the precipitate is washed to form an industrial lithium carbonate product and the lithium carbonate content is more than or equal to 99.0 percent and is in accordance with the requirements of GB / T 11 075-2003 standards. The method has the advantages that: liquid-liquid extraction with an organic solvent is adopted to realize the separation of lithium from magnesium, the lithium carbonate is precipitated by inorganic slats, the lithium carbonate is extracted from the salt lake brine with a high magnesium-to-lithium ratio, the process is simple, the control is easy, the operational reliability is high and the application range is wide; a process of calcination and diluted lithium solution evaporation and concentration is saved, the energy consumption is only 30 to 50 percent of that of the conventional process for producing lithium carbonate by using lithium-containing brine; initial raw material consumption comparison show that the production cost of the method is only about 8 percent of that of the prior art; and the raw material brine can return to a storage pool after the extraction of the lithium carbonate, so no by production disposal problem is involved, environmental pollution is relatively low and lithium yield in the whole process is more than or equal to 70 percent.

The present invention relates to a supplementary shelf assembly for a refrigerator. The supplementary shelf assembly of the present invention comprises a pair of support skirts mounted on a ceiling of a storage space and formed with at least two guide slots in front and rear ends thereof; at least two support links each of which includes a connection portion having a length relatively shorter than a distance between the support skirts, support guide portions extending perpendicular from both ends of the connection portion, respectively, and penetration portions extending outwardly and in parallel to the connection portions from ends of the support guide portions and penetrating the corresponding guide slots to be moved along the guide slots, respectively; and a supplementary shelf rotatably supported by the connection portions, and moved forward or rearward of the storage space and then elevated or lowered to be selectively located on a position near the ceiling of the storage space or on a position spaced apart by a predetermined interval from the ceiling of the storage space. According to the present invention, since a front and rear length of the supplementary shelf is equal to that of the main shelf, the storage space can be effectively utilized. Further, since the supplementary shelf is inadvertently swung due to a simple structure during its use, the supplementary shelf assembly can be simply manufactured and assembled. Furthermore, since the accommodation and withdrawal of the supplementary shelf is performed in regular manner, the operational reliability thereof can be improved and storage articles can be stably placed on the supplementary shelf.

The invention relates to a 'Brake-by-wire' braking system comprising a main cylinder (3) and wheel braking circuits (I, II) associated thereto and two brake booster pressure fluid circuits which are completely separated from said wheel braking circuits wheel braking circuits. In order to use a pressure control valve (34) associated with the first brake booster pressure fluid circuit for controlling a pressure in an intermediate space (21) not only by pressing on a pedal but also electrically, means (39, 40) for electrically controlling the intermediate space (21) pressure are provided with the pressure control valve (34).

The invention relates to a renewable energy source integrated complementary power generation technology for a distributed power supply and provides a multi-energy integrated complementary power generation method and multi-energy integrated complementary power generation device consisting of water energy, wind energy, solar energy and other renewable energy sources. According to the method, the water energy serves as a main body, the peculiar mountain valley wind of a hydropower station is fully utilized, the solar energy, the biomass energy and other renewable energy sources which can be relatively concentrated are locally utilized and are gathered around the hydropower station, a low-voltage alternating current bus [W1] of the hydropower station serves as a grid-connected access point, and a water, wind, solar and biomass multi-energy integrated complementary power generation system which takes water and electricity as the center and takes the water and wind complementation as the basis. According to the device, a hydropower station [G1] serves as a main body, the electric energy generated by power generation subsystems [G2], [G3], [G4] and [G5] is subjected to full power conversion and is connected to the [W1] in a grid-connected mode, the original switching device and grid line of the hydropower station are utilized, and a multi-type renewable energy source integrated complementary distributed power supply which can supply power in a grid-connected mode and independently operate is formed.

The invention provides a quantitative analysis method for automatic device dynamic reliability according to the function and work characteristics of the power system automatic device, aiming at searching out the weak link of the system and providing a reference basis for improving reliability of automatic device design and operation. The method comprises the following steps of: firstly, establishing the cumulative failure probability, availability, probability important indexes of basic components; secondly, establishing an automatic device dynamic reliability model conjoining a Markov state space and a dynamic fault tree, and providing a Monte Carlo simulation method based on a dynamic fault tree structure for reliability quantitative evaluation of a correlation system; and finally, verifying the validity of the provided method by examples, and performing correlation analysis. The result shows that the method has referential value for reliability assessment, component impact analysis and weak link recognition of the power system automatic device.

The embodiment of the invention provides an unmanned aerial vehicle flight control method and device, and a remote controller. The method comprises: obtaining a plurality of location data obtained by location operation in the remote controller; determining a plurality of target positions according to a plurality of location data; calculating a flight course according to a plurality of target positions; and sending the flight course to an unmanned aerial vehicle to flight according to the flight course. The unmanned aerial vehicle flight control method and device, and the remote controller do not need to carry sets of devices so as to reduce the hardware cost, because a remote device integrates a plotting function with no need for carrying a plurality of devices and data exchange of a plurality of devices so as to improve the simplicity of the operation, improve the operation efficiency of the unmanned aerial vehicle, reduce the rate of date sending error when data exchange and enhance the operation reliability of the unmanned aerial vehicle.

The invention relates to a fault diagnosis method for a power converter of a switch reluctance motor; current spectrum of the power converter phase of the switch reluctance motor is tested and used asfault characteristic quantity; and the proportion coefficient Lambada of relative spectrums ratio of the phase current is defined as the ratio of the amplitude of fundamental component of the phase current and the amplitude of direct current component of the phase current. If the coefficient of the relative spectrum ratio of all phase current is basically constant, the power converter does not occur fault; if the amplitudes of the direct current component and the fundamental component of a certain phase current are near to zero respectively, the phase occurs open fault; and compared with thecoefficient of the relative spectrum ratio of the phase current without fault, if the coefficient of the relative spectrum ratio of a certain phase current occurs obvious change, the phase occurs short fault. The method not only can be used for fault detection, discrimination for types of faults and positioning of fault phases when one phase of the power converter of the switch reluctance motor occurs fault, but also can be used for fault detection, discrimination for types of faults and positioning of fault phases when two or more than two phases of the power converter of the switch reluctance motor occur fault.

The invention provides a photovoltaic power station operation and maintenance system; the system comprises a data collecting module, a communication module, a data storage module, a monitor module, a fault warning module, a video module, a specialist diagnosing module, an asset management module, and an operation and maintenance module; the method of linkage among multiple systems is achieved; the portion of manual interference is reduced; effective measures are provided for increasing the operation efficiency and reliability of photovoltaic equipment, reducing system downtime, increasing operation and maintenance efficiency, as well as reducing the operation and maintenance cost, wherein the asset management of full life cycle provides scientific and credible information for financing, transferring and securitization of the photovoltaic power station.

The invention discloses an air conditioner and an air supply control method used for the air conditioner. The air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a liquid accumulator, a first throttling element, a second throttling element and a third throttling element, wherein the compressor is provided with a suction end, a discharge end and an air supply end; a first end of the indoor heat exchanger is connected with a third interface of the four-way valve; a first end of the outdoor heat exchanger is connected with a fourth interface of the four-way valve; the liquid accumulator is connected with a second end of the outdoor heat exchanger by a first liquid pipe, is connected with a second end of the indoor heat exchanger by a second liquid pipe, and is connected with an air supply end of the compressor by an air pipe; the first throttling element is arranged on the first liquid pipe; the second throttling element is arranged on the second liquid pipe; the third throttling element is connected between a first node and the air supply end of the compressor. The problem that the normal operation of the air conditioner in a low temperature environment cannot be ensured by a single air supply loop in the prior art is solved, the operation effect of the air conditioner is thus ensured, and the stability and the reliability of the operation of a unit are improved.