4217 results about "Power supply unit" patented technology

Air conditioning device (1) for motorhomes, comprising: - at least one first heat exchanger for exchanging heat with the air circulating through it; - a cooling circuit (8) for a cooling fluid, with a path passing through the first heat exchanger; - a compressor (7) which includes an electric motor, for circulating the cooling fluid in the cooling circuit (8); - a power supply unit that can be connected to an external power supply to receive an electrical input current or electrical input power and to generate a variable supply voltage to drive the electric motor with an electrical supply current, - a controller (11) connected to the power supply unit that is suitable for receiving input data representative of a reference value of the electrical input current or electrical input power and that is programmed to adjust the power supply unit to generate the supply voltage with a reference amplitude and / or frequency such that the electrical input current or electrical input power is below the reference value; - a positioning device designed to determine the position of the air conditioning device (1); and - a memory containing a plurality of reference values ​​corresponding to a plurality of locations, wherein the controller (11) is capable of receiving a location signal from the positioning device and of setting as input data one of the reference values ​​present in the memory depending on the location signal.

The invention discloses a power failure and recovery logic-based power supply fault diagnosis method for a low-voltage power distribution network, which belongs to the technical field of power supply fault diagnosis and comprises the following steps of: converting a user unstructured power failure complaint into a standardized event tag by utilizing a natural language processing technology, synchronously aligning an ammeter power failure pulse and a branch switch action record, and performing power failure diagnosis; constructing a multi-dimensional space-time event sequence; a fault propagation logic network is established through power supply unit topology division, a fault diffusion path is deduced according to a power failure time sequence difference of adjacent units and a failure state of a protection device, and an initial fault point is reversely positioned. And meanwhile, the fault association probability between the units is dynamically corrected, and a weighted candidate fault chain is generated. And through multiple verification mechanisms, the fault propagation tree is reversely corrected. And finally, calculating the confidence coefficient, and screening out the fault chain with the optimal time-space consistency. The problems of multi-source information splitting, space-time correlation weakening and insufficient verification reliability in low-voltage power distribution network fault positioning are solved.

The invention relates to the technical field of electrical equipment detection, and discloses an electrical equipment real-time state live detection method and system, and the system comprises a non-contact multi-source sensing array, an edge calculation unit, a high-frequency pulse excitation module, a self-adaptive installation structure, an intelligent diagnosis platform, and a self-energy-taking power supply unit. When electrical equipment state live-line detection is carried out, infrared thermodynamic characteristics, ultraviolet corona intensity and ultrasonic discharge signals are fused and collected through a non-contact multi-source sensing array, multi-parameter real-time sensing under the live-line condition is achieved, the problem of signal distortion caused by electromagnetic interference in traditional detection is solved, and the accuracy of state parameter extraction is improved; and meanwhile, the multi-dimensional feature data is subjected to standardization processing in combination with an edge calculation unit, so that the system can eliminate interference of environmental factors on detection results, the consistency of evaluation results under different working conditions is guaranteed, and state diagnosis errors are reduced.

The main object of the invention is an antenna module for an acoustic point defence system (SAD) and an acoustic system comprising said module. The antenna module comprises at least one array of electroacoustic transmitting transducers (TX) and at least one array of electroacoustic receiving transducers (RX). The arrays of transmitting transducers and the arrays receiving transducers have the characteristic of being housed in a watertight container adapted to be submerged in water when the module is in operation, for example by means of a hoist or winch device (SMMR - Launching and Recovery System). The container has watertight accesses, for example via watertight connectors, for at least one cable for a power supply signal, connected or connectable with a power supply unit external to the container, and for at least one cable for a data signal, connected or connectable to a remote control unit adapted to send commands and receive target detection states and / or signals. The antenna module comprises a local control and calculation unit housed inside the container, which local control and calculation unit is equipped with an input for the power supply signal and a port for the data signal, and is interfaced with the arrays of transducers for controlling the signal transmitted by the arrays of transmitting transducers and processing the signals received by the arrays of receiving transducers on the basis of commands received by the data port.

In a battery monitoring device for monitoring a state of a rechargeable battery that includes an electrolyte and a plurality of electrodes, a response signal input unit is configured to receive a response signal of the rechargeable battery to a predefined AC signal, and a calculation unit is configured to calculate a complex impedance of the rechargeable battery based on the response signal. A power supply unit is configured to receive a power supply voltage from the rechargeable battery and supplies the power supply voltage to at least the calculation unit. A first electrical path connecting the rechargeable battery to the power supply unit and a second electrical path connecting the rechargeable battery to the signal control unit are provided independent of each other. The signal control unit is configured to cause the rechargeable battery to be monitored, as a power source, to output the predefined AC signal.

The present application provides an electric vehicle and a battery system. The electric vehicle comprises: a frame; a first power consumption unit and a second power consumption unit, the first power consumption unit and the second power consumption unit being connected to the frame; and a battery system, comprising a first power supply unit and a second power supply unit, the first power supply unit and the second power supply unit each comprising at least one battery pack, the first power supply unit supplying power to the first power consumption unit, and the second power supply unit supplying power to the second power consumption unit, wherein the at least one battery pack can supply power to a handheld tool.

The utility model relates to a radio frequency power amplification circuit with a harmonic suppression function and a radio frequency chip. The radio frequency power amplification circuit comprises an input matching unit, a first-stage power amplification unit, a first-stage bias unit, a first-stage power supply unit, an inter-stage matching unit, a second-stage power amplification unit, a second-stage bias unit, a second-stage power supply unit and an output matching unit. According to the utility model, the LC type trap circuits are designed and used in the power supply unit and the inter-stage matching unit, so that secondary, tertiary and high-order harmonic suppression is realized in the radio frequency power amplification circuit; meanwhile, based on LC circuit structures in the power supply unit and the inter-stage matching unit, the inter-stage matching bandwidth is widened, and the linearity of the multi-stage power amplification unit is improved.

The invention relates to the technical field of unmanned aerial vehicles, in particular to an unmanned aerial vehicle detection tracking device, method and equipment, which comprises a data sensing unit, a calculation unit, a mechanical and power supply unit, a communication and storage unit and a countering execution unit, and is characterized in that the data sensing unit is used for acquiring image data and servo turntable rotation angle data; the calculation unit is used for deploying a lightweight neural network model and a multi-algorithm fusion process, processing sensor data and realizing unmanned aerial vehicle target detection and tracking logic control; the mechanical and power supply unit is used for providing physical support, servo motion capability and energy supply for the device; the communication and storage unit is used for real-time data transmission and storage and encryption archiving of historical data and image videos; and the countering execution unit is used for implementing signal interference or physical interception on the detected and tracked target. Therefore, the problems of easy target loss, low small target identification precision, poor complex environment adaptability, insufficient countering means and the like of a traditional device are solved.

The invention discloses a multiband high-voltage power supply control system and a normalization control and protection method thereof, and relates to the technical field of power supply control, and the method comprises the steps: collecting multi-mode signals of S, C and Ku band high-voltage power supply systems and a cooling system; an SDAE deep network and an integrated learning AdaBoost framework are combined to construct a fault diagnosis model, and a fault type and confidence are obtained according to signal features; when a fault occurs, high-voltage output of a corresponding power supply unit is cut off and reported through an isolation interface, and a deep reinforcement learning agent is used for carrying out protection action intelligent decision making; a digital twinborn model of a power supply unit is constructed, an improved grey wolf optimizer is used for multi-task collaborative optimization, optimized system parameters are acquired and issued to a PLC for execution, and waveband output stability is ensured. According to the invention, high reliability, rapid response and intelligent operation and maintenance of the multi-band high-voltage power supply system are realized through deep integration of multi-source signal acquisition, intelligent fault diagnosis, adaptive protection decision and digital twinning optimization.

The invention discloses a power supply method of a storage server, electronic equipment, a storage medium and a program product, and relates to the technical field of power supply, and the power supply method comprises the following steps: using a power supply unit whose rated output power is less than a power consumption limit value of the storage server to supply power to the storage server; if the current power consumption value of the storage server is greater than the rated output power of the second power supply unit and the electric quantity of the backup battery unit is greater than the primary standby power threshold value, the second power supply unit and the backup battery unit are used for supplying power to the storage server; the technical problem of resource waste caused by the fact that the PSU and the BBU with the rated output power larger than 2000 W are used only when the double AC input circuits connected with the double PSUs are powered off or the double PSUs are abnormal in the prior art is solved, and the technical effect of avoiding resource waste is achieved.

The invention relates to the field of energy storage loop monitoring, and particularly discloses an innovative energy storage loop system for an operating mechanism of a medium-voltage switch cabinet, which realizes soft start and contactless control of an energy storage motor by introducing a dynamic motor control circuit. The multistage stroke detection device replaces a mechanical limit switch, provides real-time and continuous position monitoring for the energy storage mechanism, and thoroughly eliminates feedback lag and inaccuracy. The core energy storage state analysis unit can identify abnormal working conditions in the energy storage process in real time through intelligent acquisition, analysis and decision making of signals. Besides, the power supply unit provides a stable operation basis, and the bidirectional communication interface ensures information interaction between the system and the external environment, so that an intelligent energy storage ecological system with controllable closed loop, feedback of state and early warning of fault is jointly constructed, and the response speed and the operation stability of the medium-voltage switch cabinet operating mechanism are comprehensively improved.

The invention discloses an MEMS and TMR fused overhead line lightweight monitoring device, and the device comprises an annular shielding cover which sleeves a to-be-detected overhead conductor and is coaxial with the to-be-detected overhead conductor, and the side wall of the annular shielding cover is provided with a through hole; the sensing unit comprises at least two MEMS electric field sensors and at least two TMR magnetic field sensors and is used for detecting an electric field and a magnetic field generated by the overhead conductor to be detected; the analysis processing unit is used for receiving, processing and transmitting the signal generated by the sensing unit; and the power supply unit is arranged in the annular shielding cover and is electrically connected with the sensing unit and the analysis processing unit. The beneficial effect of the invention is that the coupling crosstalk phenomenon generated by an external electromagnetic field can be effectively suppressed. Moreover, the monitoring device is small in size, is convenient to install and deploy in a complex line environment, provides a stable hardware basis for precise inversion of voltage and current through structural cooperation, and provides reliable support for intelligent monitoring of an overhead line.

The invention discloses a power supply control method and device of a server and electronic equipment, and relates to the technical field of computers, power supply modes of a group of power supplies comprise a static redundant power supply mode and a dynamic redundant power supply mode, and the method comprises the following steps: obtaining power consumption data of the group of power supplies in a specified historical period to obtain historical power consumption data; on the basis of the historical power consumption data, the load trend of the group of power supplies in a specified future time period is predicted, the predicted load trend of the group of power supplies is obtained, and the specified future time period is a future time period with the current moment or a future moment after the current moment as a starting moment; and according to the predicted load trend and the specified mode switching condition, dynamically switching the power supply mode of a group of power supplies, thereby solving the technical problems of low efficiency of the power supplies and serious electric energy waste in a power supply control method in the related technology, and achieving the technical effects of improving the efficiency of the power supplies and reducing the electric energy waste.

The utility model discloses outdoor operation equipment. The outdoor operation equipment comprises a frame; the frame is provided with a walking assembly used for supporting outdoor operation equipment to walk; the cutting assembly is used for executing outdoor operation; the power supply device is at least used for supplying power to the outdoor operation equipment, and the power supply device comprises a power supply unit which can be detached from the outdoor operation equipment to supply power to other tools; the battery bin is used for being assembled and electrically connected with the power supply unit; and the multiple temperature adjusting assemblies are arranged on the two oppositely-arranged side plates of the battery bin correspondingly, and the multiple temperature adjusting assemblies are used for conducting heat exchange between heat in the power supply unit and external air. According to the outdoor operation equipment, the battery pack can be reasonably cooled and heated.

The invention discloses a neck-hung sign language interpretation device and a sign language semantic recognition interpretation method thereof.The neck-hung sign language interpretation device comprises a wearing support which defines a neck surrounding space and comprises a middle connecting arm and two shells, and the two shells are connected to the two sides of the middle connecting arm respectively; the image acquisition unit is arranged on the front side of the shell, comprises a three-dimensional depth camera and an adjusting mechanism for driving the three-dimensional depth camera to rotate, and is used for dynamically tracking and acquiring continuous sign language videos; the processing module is integrated in the shell, comprises a main control processor and a memory, and is used for operating a sign language recognition algorithm; the voice output unit is electrically connected with the main control processor and is used for playing the translation result; and the power supply unit supplies power to the image acquisition unit, the processing module and the voice output unit. Gesture languages used by the deaf-mute for communication are converted into natural languages which can be easily understood by normal people, the deaf-mute group is helped to speak, and the problem of information output when the deaf-mute communicates with the normal people is solved.

The invention relates to the technical field of power grid side energy storage, in particular to a power grid side flywheel energy storage stationing method considering source grid requirements, and aims to solve the problem of how to improve the adjusting effect of power grid side shared energy storage in the peak period of power utilization according to the source grid requirements. The invention provides a power grid side flywheel energy storage point distribution method considering a source network demand. The point distribution method comprises the following steps: determining pre-site selection data of power grid side shared energy storage according to an energy storage demand of a target area and a topological structure of cable equipment in the target area; acquiring cable equipment corresponding to the corrected site selection data, and calculating an energy storage demand corresponding to the corrected site selection data according to historical electricity consumption of the cable equipment; and obtaining a power supply unit in the target area, planning all the corrected site selection data according to the power supply capability and the energy storage demand of the power supply unit, and obtaining the actual distribution point of the power grid side shared energy storage.

The embodiment of the invention provides an intelligent electric precipitation system. The intelligent electric precipitation system comprises a power management module, a working condition sensing module, a dynamic optimization module and a cooperative control module, the power supply management module comprises a high-frequency power supply unit and a power-frequency power supply unit, and the high-frequency power supply unit adopts a full-bridge series-parallel hybrid resonance circuit; the working condition sensing module is configured with a distributed sensor network; the dynamic optimization module establishes a multi-objective optimization model; the cooperative control module realizes a four-level control architecture; the system realizes optimal balance of dust removal efficiency and energy consumption by collecting working condition parameters in real time and dynamically adjusting working parameters of a power supply. According to the intelligent electric dust removal system, through a hybrid power supply framework, a multi-sensor network and four-stage cooperative control, the dust removal efficiency is improved, and the equipment reliability and the intelligent level are improved.

The invention relates to a fault detection method and system suitable for a vehicle body provided with a retarder, and relates to the technical field of vehicle body fault detection. The method comprises the following steps: acquiring and detecting a vehicle body state signal of a vehicle body; vehicle body dynamic signals of a vehicle body are obtained and detected; and accessing a buffer and enabling the retarder to enter a test mode to test the function of the retarder. The fault detection system is composed of a controller, a speed signal detection unit, a signal amplifier and a power supply unit which are connected with one another to work cooperatively. According to the method, the effects of comprehensively detecting the fault of the vehicle body provided with the retarder, effectively positioning the fault position and evaluating the fault condition are achieved.

A configurable power supply bay system. The configurable power supply bay system includes a power supply bay and a power supply bay system configuration component, the power supply bay configuration component being configured to be mounted to the power supply bay, the power supply configuration component configuring the power supply bay to mount a plurality of types of power supply units within the power supply bay, each of the plurality of types of power supply units having respective external characteristics.

The invention discloses an intelligent necklace for a shepherd based on multimode fusion positioning and a control method of the intelligent necklace. The intelligent necklace for the shepherd based on multimode fusion positioning comprises a necklace body of a strip-shaped structure. A multi-mode hybrid positioning unit, a dual-mode communication unit and a power supply unit are arranged on the necklace body; the multimode hybrid positioning unit is composed of a speed sensing module, a satellite positioning module, an inertial navigation compensation module and a UWB auxiliary positioning module, and is used for generating a positioning signal. The dual-mode communication unit is electrically connected with the multi-mode hybrid positioning unit, and signal interaction between the multi-mode hybrid positioning unit and the mobile terminal is realized through 4G / Cat-M1 and LoRa protocols; the power supply unit supplies power to the multi-mode hybrid positioning unit and the dual-mode communication unit.

The invention provides a control method and device which can be applied to the technical field of server heat dissipation. The control method comprises the following steps: processing a plurality of pieces of obtained initial temperature data of a plurality of detection points in at least one power supply unit, and determining target temperature data in the plurality of pieces of initial temperature data; processing the target temperature data, the environmental data of the power supply unit and the related load data to obtain temperature features, environmental features and load features for the plurality of fluctuation types; obtaining a temperature prediction result of the power supply unit at the later moment based on the temperature characteristics, the environment characteristics and the load characteristics; and controlling the flow of the liquid cooling device in the power supply unit based on the temperature prediction result.

The invention discloses a self-walking unmanned aerial vehicle and a control method. The self-walking unmanned aerial vehicle comprises an unmanned aerial vehicle module, a walking module, an electrical connector assembly and a power system. The unmanned aerial vehicle module comprises a first driving mechanism; the walking module is detachably arranged at the bottom of the unmanned aerial vehicle module and comprises a second driving mechanism; the electrical connector assembly comprises a first electrical connector piece arranged on the unmanned aerial vehicle module and a second electrical connector piece arranged on the walking module, the first electrical connector piece and the second electrical connector piece are detachably connected in a matched mode, and the second driving mechanism is electrically connected with the second electrical connector piece; the power system is arranged on the unmanned aerial vehicle module and comprises a flight control unit and a power supply unit, and the first driving mechanism and the first electrical connector are electrically connected with the flight control unit and the power supply unit respectively. The self-walking unmanned aerial vehicle is good in environmental adaptability, small in load during flight operation and low in energy consumption, the unmanned aerial vehicle module and the walking module can share one set of power system, and the manufacturing cost is low.

The utility model relates to a rear-phase-cut single-live-wire type wall light modulator, which comprises an MOS (Metal Oxide Semiconductor) tube switch loop unit, a singlechip control unit and a direct-current power supply unit, the MOS tube switch loop unit comprises a wiring terminal J2 connected with an MOS tube Q1, a grid electrode of the MOS tube Q1 is connected with four resistors in series in sequence and then is connected with an MOS tube Q2, a drain electrode of the MOS tube Q2 is connected with a diode D2, the diode D2 is connected with a diode D1, a fixed end contact of a single-pole double-throw switch is connected with the MOS tube Q2, and two movable end contacts of the single-pole double-throw switch are connected with the wiring terminal J1 and the wiring terminal J3 respectively; the direct-current power supply unit comprises an alternating-current voltage waveform acquisition circuit, a direct-current voltage drop circuit, an overcurrent protection circuit and a filtering voltage stabilizing circuit; according to the single-chip microcomputer control unit, a linear sliding potentiometer is connected with the PC2 end of a single-chip microcomputer after being connected with a resistor in series, the linear sliding potentiometer and a rotary potentiometer are sequentially connected between the output end of the direct-current power supply unit and the ground in series, a triode Q6 is connected with a triode Q5 and then connected with the collector electrode of a triode Q7, and the base electrode of the triode Q7 is connected with the PA6 end of the single-chip microcomputer after being connected with a resistor in series.

The invention discloses a follow-up PIV boundary layer flow field test system and test method based on electrolytic hydrogen bubbles. The follow-up PIV boundary layer flow field test system comprises an integrated optical measurement module and a tracer particle generation module, the optical measurement module is arranged in the UUV and comprises a laser transmitter assembly, a sapphire prism and two imaging cameras which are symmetrically arranged, and laser sheet light forms a sheet light area on the outer surface of the UUV after being refracted by the sapphire prism; the tracer particle generation module comprises a cathode, an anode and a power supply unit, the cathode is a platinum wire array composed of a plurality of platinum wires arranged in the axial direction of the UUV, and the platinum wires are located at different heights away from the wall face of the UUV; the power supply unit selectively electrifies the platinum wire, independently adjusts the voltage, controls the number and frequency of generated hydrogen bubbles, and achieves the synchronous measurement of flow field information at different thickness positions of a boundary layer. According to the invention, boundary layer flow field in-situ follow-up measurement and synchronous fine measurement of different thickness positions under the condition of not changing the UUV shape are realized, and the device has the advantages of high integration level, small flow field disturbance, high measurement efficiency and the like.

The invention relates to the technical field of solar street lamps, and provides a solar street lamp sectional illumination control system with human body induction, which comprises a local module and a cloud service platform, and is characterized in that the local module comprises a sensor group unit, a power supply unit, an illumination unit, a data processing unit and a communication unit; the local module obtains a multi-source data packet through a sensor of the local module, the data processing unit judges the existence of a human body through the multi-source data packet, and the lighting unit is controlled through a judgment result to form a corresponding lighting mode. According to the invention, a graded awakening mechanism of the millimeter wave radar, the PIR sensor and the thermal imaging sensor is adopted, the PIR sensor detects a dynamic heat source in real time, the radar and thermal imaging are awakened to carry out accurate detection, and the radar and the thermal imaging sensor carry out detection alternately and periodically, so that missing detection can be avoided while the power consumption is reduced.

The present invention provides a movable vehicle. The movable vehicle comprises a carrying mechanism and a holding mechanism connected to the carrying mechanism, and the bottom of the carrying mechanism is provided with wheels, wherein the movable vehicle further comprises a starting mechanism arranged on the holding mechanism, the starting mechanism comprising a starting unit, a power supply unit, and a controller. The starting unit is configured to be switchable between an initial position and a start position. The controller is configured to be electrically connectable to the power supply unit, wherein when the starting unit is in the start position, the starting unit is coupled to the controller to activate the electrical connection between the controller and the power supply unit, and when the starting unit is in the initial position, the starting unit is decoupled from the controller. According to the above solution, a user can easily activate the electrical connection between the controller and the power supply unit simply by operating the starting unit on the holding mechanism, thereby allowing the controller to further perform various control operations.

The utility model belongs to the field of fluid mechanical performance testing, and particularly discloses a water pump or hydroelectric generating set operation performance testing device which comprises an acquisition module and a testing module, the acquisition module comprises a power supply unit, a signal conditioning circuit and a data acquisition card, and the power supply unit is packaged by a sensor group and a portable interface box. The interface box and the sensor group are connected through phoenix wiring terminals, so that each path of sensor forms an independent signal channel, the test module comprises a calibration module, a test module, a sorting module and a signal analysis module, the calibration module comprises calibration optical cables connected with the signal channels in a one-to-one correspondence manner, and the calibration optical cables are connected with the signal channels in a one-to-one correspondence manner. The test module comprises an online monitoring unit, a test unit and a test recording unit, the sorting module is used for obtaining effective test data from the test recording unit, and the signal analysis module comprises a time domain analysis module and a frequency domain analysis module and is used for drawing various data charts for the effective test data. According to the utility model, the unit test process is simplified, and the error probability is greatly reduced.

The invention relates to the technical field of software communication, and discloses a software offline downloading method and an offline downloader. The method comprises the following steps: establishing an offline downloading system, wherein the offline downloading system comprises an offline downloader main body and target equipment of to-be-updated firmware; before firmware data transmission is carried out on the offline downloader main body and the target equipment, a user-defined handshake process is executed to confirm that both the offline downloader main body and the target equipment are in a data transmission ready state; and transmitting the firmware file to the target equipment through the communication module, and performing data verification in real time in the transmission process. The rechargeable power supply unit is arranged in the offline downloader main body to break through power supply limitation, the double communication sub-modules are adapted to different scenes, self-defined handshake is matched with verification before transmission to improve reliability, firmware verification and error processing guarantee safety, the whole downloader does not need to depend on a computer and an external power supply, the operation threshold is low, and the practicability is high. And a stable, convenient and safe scheme is provided for firmware updating of the target equipment.

The invention discloses an intelligent memory chip high and low temperature test device and a test tuning method, and relates to the technical field of memory chip testing, the device comprises a test unit used for constructing a cold and hot test environment for a to-be-tested memory chip; the power supply unit is used for providing direct current for each unit; the management unit is used for detecting environment data in real time and uploading the environment data to the data acquisition and analysis server, and regulating and controlling the environment data in a closed-loop manner by combining a test instruction; the excitation generator is used for generating and sending test excitation for the to-be-tested storage chip according to the test instruction, recording test data and feeding back the test data to the data acquisition and analysis server; and the data acquisition and analysis server is used for pre-judging faults of the to-be-tested storage chip based on an AI model according to the real-time environment data and the test data, optimizing test instruction parameters or storage chip FTL algorithm parameters, generating a dynamic regulation and control test instruction and issuing the dynamic regulation and control test instruction. According to the invention, accurate test and optimization of the memory chip in an extreme temperature environment can be realized.

The invention relates to a neck hanging type water negative ion generator which comprises a generator shell, a water negative ion generating unit, a fan unit, a power supply unit and a control unit. The control unit is electrically connected with the water anion generating unit and the fan unit respectively; the power supply unit is electrically connected with the control unit, the water anion generation unit and the fan unit respectively; the generator shell is provided with two opposite free ends, and fan units are arranged in the two free ends respectively. A first opening for the water anion generating unit to output water anions and a second opening for the fan unit to output air are formed in the upper side of the free end; the first opening and the second opening are arranged side by side in the extension direction of the free end, side by side in the width direction of the free end and at least partially overlapped; the water anion generating unit is used for generating water mist with water anions; the oppositely-arranged fan units are used for forming opposite air curtains so that water mist can be distributed and resided between the opposite air curtains.