941results about How to "Save electricity" patented technology

A luminaire diagnostic system including a lamp and a photocontroller for automatically turning the lamp on during periods of darkness and off during periods of daylight wherein the photocontroller includes detector circuitry for detecting the load drawn by the lamp, a microprocessor, responsive to detected load and programmed to predict a condition of the lamp such as a cycling event and/or lamp out condition based on the load drawn by the lamp, and an indicator such as a visual alarm for indicating the occurrence of the condition detected and/or a transmitter for transmitting the detected condition to a remote location. Also, upon cycle detection, the lamp may be turned off to prevent damage to fixture components.

The invention discloses two-screen notebook computer, which comprises main machine with main keyboard and main display connected to main machine side; wherein, there is at least one assist display and corresponding assist keyboard set on back of main display, which solves the problem that existing notebook computer can be operated only one people, two persons can use one notebook synchronous to communicate on the main and assist displays face to face; and it can meet people to operate and use notebook on little space and on journey, also conserve energy.

The invnetion discloses a impulse electric desalting and dewatering technology, after heating crude oil mixed with demulsifier and wash water entered into desalting pot with two grades, technical condition of the first grade of the electric desalting is: 3%-15% of water injection, pulse electric field strength is 800 v/cm-5000 v/cm in high-field, pulse frequency is 50 Hz-2000 Hz, duty ratio is 6%-50%; technical condition of the second grade of the electric desalting is: 3%-12% of water injection, pulse electric field strength is 1500 v/cm-5000 v/cm in high-field, pulse frequency is 50 Hz-2000 Hz, duty ratio is 0%-50%. After desalting and dewatering in this technical condition, salinity >=3.0 mg NaCl/L, water content >=0.3%, dewatering oilness >=100 mg/L of treated crude oil to deeply desalt. The technique is suit for electric desalting of light, middle and heavy crude oil with advantages of high efficiency, low cost and environmental protection, general desalting efficient is more than 95%, saving power about 60% comparing with ordinary electric desalting technique.

The invention discloses a gyro-type dynamic self-balancing pan-tilt which comprises a frame component, a motor component, shooting equipment (1) and a control component; the control component comprises a processor and an inertial sensor; the inertial sensor detects the posture information of the shooting equipment (1); the processor controls the motor component according to the posture information; and the motor component directly drives the frame component to rotate in a manner relative to the shooting equipment so as to adjust the shooting angle of the shooting equipment (1). According to the gyro-type dynamic self-balancing pan-tilt, the motor component is adopted as motive power to directly drive the frame component of the pan-tilt, so that less energy is consumed, and the electricity is saved; and meanwhile, the stepless adjustment can be realized in the driving of the motor, the action response time is short, various postures of a carrier body can be adapted to by quickly starting, stopping or timely adjusting the rotating speed, so that the shooting stability of the shooting equipment (1) is improved.

A central air conditioning system optimizing method based on a mathematic model includes the following steps of changing values of main variables within constraints on the basis of the established energy consumption mathematic model so that the total energy consumption of a system can reach the minimum, wherein at the moment, the parameter value of the system is the optimal working condition value; adjusting the main variables to the optimal working condition value. Meanwhile, the invention provides the central air conditioning system optimizing system based on the mathematic model. The system comprises a processing module and a dispatching module. The processing module changes the values of the main variables in the constraints on the basis of the established energy consumption mathematic model so that the total energy consumption of the system can reach the minimum, and at the moment, the parameter value of the system is the optimal working condition value. The dispatching module is used for adjusting the main variables to the optimal working condition value. By means of the method and system, running parameters of a central air conditioning system can be optimized, the central air conditioning system runs under the optimal working condition, and electric energy is saved.

Provided is a radio communication method capable of optimally using the wide-band communication enabled time while maintaining power saving in an ad hoc network. According to this method, in the ad hoc network using the wide-band communication and a narrow-band communication, transmission and output of the narrow-band synchronization tone signal and the resynchronization tone signal are controlled so that the reach radius of the narrow-band synchronization signal and the resynchronization tone signal exceeds the reach radius of the wide-band signal (milli-wave UWE signal). Thus, when radio communication devices pass by each other, super frame synchronization is completed before reaching the wide-band communication enabled range of the ad hoc network, thereby optimally using the wide-band communication-enabled time.

The invention provides a novel megawatt wind generating set testing system and a testing method thereof. Energy provided by a power system provides electric energy for a double shaft-extension dragging motor by a series of devices; then the dragging motor drives a tested set to operate by a series of devices such as a wind wheel simulator and the like; and the electric energy generated by the tested set is returned to a distribution transformer by a series of devices so that energy feedback is realized. The tested set can simulate the characteristics of a wind turbine under different wind conditions by means of the wind wheel simulator and the output characteristics of the tested set can be detected by the testing system. Meanwhile, the low voltage ride through (LVRT) performance of the tested set can be tested by arranging an LVRT device in the feeding link. The system has the advantages of electric energy saving, flexible configuration and wide applicable power range, capability of testing the control performance and the output power characteristics of the tested set, capability of detecting the low voltage ride through (LVRT) capability of the tested set by adopting the LVRT device, strong compatibility and expansibility and capability of knowing the testing conditions on site in time and meeting multidirectional testing requirements.

A cellular phone has a black-and-white LCD that displays characters and communication information and a color LCD that displays an image. The image and the characters are displayed on the separate LCDs. Thus, the characters are not superimposed on the image, and they are easy to see. When the image is not needed (the user is not using the phone or the user is talking on the phone), only the black-and-white LCD displays the characters and the color LCD is turned off to save energy.

The present invention discloses an energy-feedback type power quality disturbance generating device, which relates to a power quality disturbance generating device. The device comprises a harmonic source (1), a feedback link (2), a middle direct current capacitor (3), a control terminal (4), a first LCL filtering link (5), and a second LCL filtering link (6). The control terminal (4) adopts a DSP controller to realize that a control signal which is generated according to the setting of a user controls the harmonic source to partially generate current disturbance. The harmonic source and the feedback link are cascaded via the middle direct current capacitor to form an AC-DC-AC topological structure so as to realize power feedback. The alternating current side of the harmonic source is connected with a power network via the first LCL filtering link. The alternating current side of the feedback link is connected with the power network via the second LCL filtering link. The device is capable of simulating harmonic current, active current, inductance reactive current or capacitive reactive current of a plurality of combination frequencies, and the device is capable of simulating various working conditions of a plurality of nonlinear loads such as electric arc furnaces, medium frequency furnaces, welding machines and frequency converters, etc.

The invention provides a liquid cooling self-excitation type eddy current retarder with a salient pole structure, belonging to the field of automobile braking. The liquid cooling self-excitation type eddy current retarder comprises a retarder rotor (9), a retarder stator (5), a retarder coil (8), a retarder generator and a control module, wherein the retarder rotor (9) is a tooth-shaped rotary plate; the axial half-section of the tooth-shaped rotary plate is a reverse h shape; two bulges at the both sides of a dentate disc are two salient poles of the retarder rotor (9); the retarder rotor (9) is connected with a transmission shaft (13); the inner circle of the retarder stator (5) and the outer circle of the retarder rotor (9) are coaxial; and the retarder coil (8) is an individual coil, is mounted between the two salient poles of the retarder rotor (9), and is fixedly connected with the retarder stator (5). According to the liquid cooling self-excitation type eddy current retarder provided by the invention, the electric energy is saved and the large impact to an automobile storage battery when the retarder is started is avoided by using a self-generating manner; and the coil is sleeved in the middle of a rotor disc by using the individual coil which is wound in a concentrated manner, so that the winding, the installation and the control of the coil can be simplified.

A food baking one-key-system control method includes: setting initialization; judging whether a one-key sign is started or not; judging whether a pre-heating sign is equal to 1 or not; judging whether food is put in or not; setting accumulation heat-up time T; judging whether 15 weight collections are carried out or not; judging whether first heat-up time T1 and second heat-up time T2 are turned into or not; judging whether the first heat-up time T1 is larger than or equal to the accumulation heat-up time T or not; judging whether the accumulation heat-up time T is larger than the first heat-up time T1 and smaller than the sum of the first heat-up time T1 and the second heat-up time T2 or not; judging whether the accumulation heat-up time T is larger than the sum of the first heat-up time T1 and the second heat-up time T2 and smaller than the sum of the first heat-up time T1 and the second heat-up time T2 plus 2 or not, the answer is 'Yes', then a buzzer is started, baking is finished, and then a second step is stepped backward. The food baking one-key-system control method is convenient to use, one-key operation is only needed from beginning to end. The food baking one-key-system control method has effects of saving electric energy.

The invention discloses an intelligent unmanned inspection system of a coal conveying system. The intelligent unmanned inspection system of the coal conveying system comprises an intelligent operationand maintenance inspection management platform based on a three-dimensional virtual scene and combined with video data, an adhesive tape visual deviation diagnosing and correcting system, an adhesivetape material stacking identification and control system, a coal falling pipe material blocking visual diagnosis and control system, an adhesive tape tearing and adhesive tape defect visual diagnosisanalysis system, a visual identification based forwarding station dust detection and control system, an intelligent coal yard, a bunker bay and automobile coal unloading tank area inspection robot, anoise matrix analysis and simulation based carrier roller fault diagnosis system, the internet of things technology based sweeper pressure state management system, the internet of things technology based gear and bearing vibration detection system, a big data analysis based adhesive tape conveying efficiency evaluation system and a data statistics and analysis based device state management system, wherein the adhesive tape visual deviation diagnosing and correcting system, the adhesive tape material stacking identification and control system, the coal falling pipe material blocking visual diagnosis and control system, the adhesive tape tearing and adhesive tape defect visual diagnosis analysis system, the visual identification based forwarding station dust detection and control system, the intelligent coal yard, the bunker bay and automobile coal unloading tank area inspection robot, the noise matrix analysis and simulation based carrier roller fault diagnosis system, the internet ofthings technology based sweeper pressure state management system, the internet of things technology based gear and bearing vibration detection system, the big data analysis based adhesive tape conveying efficiency evaluation system and the data statistics and the analysis based device state management system are connected with the intelligent operation and maintenance inspection management platform. According to the system, a whole coal conveying system is monitored and controlled in real time, self-accumulation and learning capability is achieved, and the unmanned and intelligent inspection system is realized.

The invention relates to a television monitoring method based on face identification. The television monitoring method based on the face identification is characterized by comprising the following steps that (1) a television is opened and a camera shooting device is started simultaneously to obtain face information of a user; (2) extraction of facial features of the user is completed through a face identification module, and the situation whether the user is a recorded user or not is judged, if the user is the recorded user, the step (3) is carried out, and if the user is not a recorded user, information of the user is recorded; (3) television parameter information corresponding to the user is taken out and meanwhile a timing module is started; (4) the camera shooting device monitors whether the user is captured or not, if the user is captured, the timing module continues to work, and if the user is not captured, the television is controlled to enter a dormant state. According to the television monitoring method, after the user is judged through the face identification module, television channels, brightness, the contrast ratio and volume liked by the user can be directly taken out, the television is in the dormant state when watched by nobody at the same time, electric energy is saved, the user can also be reminded to pay attention to rest in time to avoid watching for too long time, and health of the user is guaranteed.

Disclosed is a method for switching playback mode, the method comprising: when a terminal is playing a video and detects the occurrence of an event triggering switching of playback mode, switching to audio playback mode and stopping processing of video data. Also disclosed are a device and terminal for switching playback mode. The solution of the present invention can achieve freedom of real-time switching of video playback mode on a terminal, saving power and increasing standby time.

The present invention relates to an auto-return type water sampler controlling device for a water sampler, which comprises a single chip microcomputer with its input terminal being connected to a pressure sensor through a level shifter and its output terminal being connected to a water sampler counterweight control circuit as well as a water sampling tank turnoff control circuit in a water sampler, wherein a dry battery or rechargeable battery is utilized as the working power of said control device, which is output to the single chip microcomputer, the level shifter, the water sampler counterweight control circuit and the water sampling tank turnoff control circuit, through a voltage stabilizing block. According to the present invention, a cable is not necessary during the put-in and callback of a water sampler, then some problems, such as depth illegibility, trips of castoff and plant roots in water and the destroying effect of a mechanical pump on an objective to be researched which are caused by a cable, are avoided; manpower participance during a water sampling operation course is not necessary, a depth gradient water sampling dautomatization is achieved; said device exhibits credible performances and has practical values.

The invention provides an automatic control refrigeration system for a high-density computer room and a method thereof. By arranging an interlayer baffle plate and a thermal cavity baffle plate in the computer room, a thermal cavity, a channel of new wind and return wind, and a channel of cooling air flow are formed in the computer room; the thermal cavity is communicated with the outside throughan exhaust fan; the channel of the new wind and return wind is communicated with the outside through an electric wind valve with a filter; the thermal cavity, the channel of cooling air flow and the outside are respectively provided with a temperature sensor of the thermal cavity, a temperature and humidity sensor of the computer room, and a temperature and humidity sensor of the outside; the temperature sensor of the thermal cavity, the temperature and humidity sensor of the computer room, and the temperature and humidity sensor of the outside are respectively connected with an I/O port of amain controller; an air conditioner, the exhaust fan, the electric wind valve with the filter, an electric wind valve of a new wind port, an electric wind valve for isolation of inner and outer cycle, and super-cool resistant blower are respectively controlled by the main controller; and the actions of executing mechanisms such as air conditioners, exhaust fans, various wind valves and the like are automatically controlled according to the values of the temperature outside a detecting room and the temperature in the computer room so that the temperature in the computer room is kept to reach aspecified range.

The invention provides a defrosting control method, a defrosting control device and a refrigerator. The defrosting control method includes the steps that the current pressure difference between a first end and a second end of an evaporator of the refrigerator is monitored, and cold air flows from the first end to the second end; whether defrosting operation is started or not is determined according to the current pressure difference. Through the technical scheme, accurate control over defrosting can be realized, the situation that defrosting operation is started when not necessary is avoided, and therefore the electricity of the refrigerator is saved.

The flashlight has on its lamp holder a movable member able to move into the lamp holder, the movable member is fixedly provided with an electric conductive strip; and has a restorable spring to normally push the movable member out of the lamp holder that is normally kept in a position to render the electric conductive strip to contact with the contact point of the circuit board. When the flashlight is turned on, a light source is created by electric connecting of a light emitting element effected by an electric conductive strip. When the flashlight is laid upside down with the lamp holder facing downwards to be not in use for a moment, by the weight of the flashlight, the movable member is moved into the lamp holder to release the electric conductive strip from contact with the contact point of the circuit board, hence the light emitting member is electrically broken, and a function of saving electric energy can be obtained.

The invention relates to an air purifier used for deeply purifying indoor air. The air purifier is simple in structure and capable of deeply and effectively purifying the indoor air. The air purifier comprises an outer shell (1), an air inlet (2), an air outlet (3) and a fan (7) arranged in the outer shell (1), the air inlet (2) and the air outlet (3) are formed in the outer shell (1), nano-photocatalyst coatings (15) are arranged on blades of the fan (7), a nano-photocatalyst coating (15) is arranged on the inner wall of the outer shell (1), a plurality of ultraviolet lamp tubes (16) are arranged in the inner wall of the outer shell (1), and the ultraviolet lamp tubes (16) are arranged at the positions close to the air inlet (2). The whole air purifier is simple in structure and easy to mount and dismount, can achieve the purification function, and meanwhile can achieve the function of humidifying and heating the air.

The invention belongs to the technical field of dyeing textile material, and relates to a turbulence type cheese dyeing method. The cheese is dipped in dye vat, in which dye liquor cyclically flows, for dyeing, and the dye liquor cyclically flows in the amplitude changed turbulence mode in the dye vat. A turbulence type cheese dyeing device comprises a dye vat accommodating the dye liquor, the dye vat is provided with a main pump driving the dye liquor to cyclically flow, and the main pump drives the dye liquor to flow cyclically in the amplitude changed turbulence mode in the dye vat. The dye liquor cyclically flows in the amplitude changed turbulence mode, thereby maximally making the dye liquor evenly pass through the cheese without a dead angle, and avoiding the occurrence of impermeable dyeing and inside-and-outside difference. As a method of making even dye only by increasing pump speed is saved, the aim of energy conservation is achieved. Because a motor of the main pump operates with changed rotation speed, the power is saved by 30 to 50%. Moreover, the problems of low strength and excessive hairy feather due to impact of liquid flow on yarn are solved, and the strength of the original fabric is maintained.

The invention discloses a fresh air ventilator and a self-cleaning control method and device thereof. The method comprises following steps: when the fresh air ventilator is in the self-cleaning mode, the air returning dry ball temperature and the air returning wet ball temperature of the fresh air ventilator can be detected; according to the air returning dry ball temperature and the air returning wet ball temperature, the air returning exposed point temperature of the fresh air ventilator can be calculated; the temperature of a heat exchanger of the fresh air ventilator can be detected; according to the heat exchanger temperature and the air returning exposed point temperature, the fresh air ventilator is controlled, and condensate water formed on the surface of the heat exchanger of the fresh air ventilator is used for self cleaning. According to the cleaning control method of the fresh air ventilator, the self-cleaning function of the fresh air ventilator is achieved, the heat exchange efficiency of the fresh air ventilator can be improved, electric energy is saved, the fresh air quality can be improved, and the user experience is improved. The invention further discloses a non-temporary computer readable storage medium.

The embodiment of the invention discloses an energy-saving routing method for a network of a data center, which comprises the following steps of: calculating basic routing and basic throughput rate of the network; calculating network load born by each switch in the network, deleting the node loaded most lightly, and generating new network topology; calculating corresponding network routing and network throughput rate under the topology; judging whether the network throughput rate is smaller than the network throughput rate threshold; if judging that the network throughput rate is more than or equal to the network throughput rate threshold, repeating the steps until the network throughput rate is smaller than the network throughput rate threshold, wherein the corresponding network routing at the moment is energy-saving routing, and the unused switch in the routing is closed or set into a sleep mode. The embodiment of the invention also discloses an energy-saving routing device for the network of the data center, which comprises a calculation module, a switch deleting module, a judging module and an energy-saving module. The method and device can greatly reduce the electric energy consumed by network equipment, and bring great benefit to managers in the data center.

The invention discloses an energy-saving park road lighting system based on a multi-Agent technology. The system comprises a plurality of road lamps, a main control system and a wireless signal relay station. Each road lamp is an Agent. The main control system is a computer server with monitoring management software and is an upper Agent of the road lamp Agent. The system is characterized in that each Agent is provided with a mainboard; a lighting module, a monitoring module, a detection module, a control module and a signal transceiving module are embedded on each main board; the monitoring module is composed of various types of sensors comprising a light sensitive sensor, an acoustic sensor, a motion detection sensor and a human body infrared sensor; each Agent is mutually communicated with the main control system through the wireless signal relay station; and the Agents are mutually communicated through the signal transceiving modules. The energy-saving park road lighting system disclosed by the invention has the advantages that the road lamp system comprises a semi-automatic intelligent body which can be used for changing road lamp switches according to environments; and, compared with the traditional road lamp system, the electric energy is greatly saved.

The invention discloses a novel home security system. The novel home security system comprises a host, a remote controller, a remote terminal and a sensing device provided with a radio transmitter-receiver set; the host is provided with a radio transmitting-receiving module, and the host is in radio connection with the sensing device, and therefore, control and information transmission can be realized through receiving and transmitting radio signals; the host is provided with a system state triggering control module, so that system working states can be selected according to conditions detected by system devices and the sensing device; and the sensing device is provided with a backup power supply. With the novel home security system of the invention adopted, the system working states can be reasonably controlled, and power consumption can be reduced, and standby time can be increased, and storage space can be saved; the sensing device and the host can be connected with each other through radios, and therefore, network connections can be diversified, and high security and firmness can be realized; the sensing device is ganged, so that a better early warning effect can be realized; and control terminal operation authority is clear, and a user identification function is realized, and therefore, false warning can be decreased, and management can be facilitated.

The invention relates to a noctilucent paint which comprises the following compositions in parts by weight: 10-13 parts of acrylic ester, 4-7 parts of epoxy resin, 3-6 parts of polyvinyl chloride resin, 12-15 parts of water, 5-8 parts of luminescent powder, 3-6 parts of alkyd resin, 12-15 parts of acrylonitrile, 4-6 parts of phthalic anhydride, 11-16 parts of tung oil, 1-4 parts of zinc phosphate, 2-4 parts of basic lead silicochromate, 5-8 parts of thinner and 2-7 parts of drier. According to the noctilucent paint, luminescent powder is added in the raw materials of the paint, so that objects coated with the paint seem beautiful; after being coated with the noctilucent paint, a billboard does not need to be illuminated by lights at night, so as to save electricity; if roads and barrier indicators are coated with the the noctilucent paint, the problems that roads, barrier markers and the like can be lightened up by electricity-consumed light sources at night for long time can be solved, and the noctilucent paint can be applied to various situations such as highways, and the maintenance cost can be lowered greatly.

The invention discloses a whole vehicle energy distribution method, a system and an electric vehicle, comprising: setting energy use priority from high to low, sequentially including safety requirement, driving requirement and comfort requirement; Detecting an entire vehicle mode, wherein when the entire vehicle mode is a mileage mode, the required power for controlling the comfort requirement isless than a first preset value, wherein the entire vehicle mode comprises a mileage mode and a normal mode; obtaining The maximum discharge power of the power battery, and the allowable power of eachenergy use priority according to the maximum discharge power; Controlling the subsystem in the whole vehicle system to work according to the permissible power. Adding A mileage mode in the whole vehicle mode, According to the whole vehicle mode, the energy distribution scheme of the whole vehicle is made. In the low temperature limit environment, if the driver pursues the long mileage, the required power of the comfort demand is limited, which not only saves the electric energy of the power battery, but also can more flexibly carry out the energy distribution according to the driver's demand,and improve the driver's driving experience.

The invention discloses a gyro-type dynamic self-balancing pan-tilt which comprises a frame component, a motor component, shooting equipment and a control component; the control component comprises a processor and an inertial sensor; the inertial sensor detects the posture information of the shooting equipment; the processor controls the motor component according to the posture information; the motor component directly drives the frame component to rotate in a manner relative to the shooting equipment so as to adjust the shooting angle of the shooting equipment; a connecting rod component for assisting the frame component is also arranged; and the connecting rod component rotates along with the frame component and supports the frame component. According to the gyro-type dynamic self-balancing pan-tilt, the motor component is adopted as the motive power to directly drive the frame component of the pan-tilt, so that less energy is consumed, and the electricity is saved; the connecting rod component and the frame component form a four-link component; the connecting rod component provides effective support for the frame component in a vertical direction, so that the load and the rigidity of the frame component are increased; when the load of the frame component is larger, the deformation of the frame component is effectively reduced; and meanwhile, the self-weight of the frame component is reduced, and the diameter of a motor is reduced.

The invention discloses a system and a method for positioning an inspection robot in a cable tunnel on the basis of a wireless network, and belongs to the technical field of wireless positioning. The integral system comprises a following network node, the inspection robot, the wireless sensor network and wireless sensor network base stations. The method for positioning the inspection robot in the cable tunnel includes that a distance-dependent attenuation model of the intensity of wireless electric signals is created; and a propagation environment of the wireless electric signals in the tunnel is divided into four types of conditions, the wireless sensor network base stations are respectively laid according to the four types of conditions of the tunnel, a plurality of wireless sensor network positioning modules are arranged in the base stations, a maintainer acquires a positioning request signal of the inspection robot when the inspection robot passes through a certain position in the cable tunnel, the positioning request signal is finally transmitted to the wireless sensor network base station arranged at a tunnel portal, and positioning information is displayed on a monitoring computer via a data interface. The system and the method bring convenience for the maintainer to position the inspection robot, and cables can be timely maintained.

A radio-frequency CMOS low noise amplifier of dual-band inductance multiplexing belongs to the technical field of radio-frequency low noise amplifiers. Based on a dual-band low noise amplifier in the prior art, the pattern of amplifying a 5.2 GHz signal is changed into a common-gate amplification mode; an inductor is dislodged; a 5.2 GHz enable circuit consisting of MOS transistors is added; and a 5.2 GHz output signal is output from a 5.2 GHz signal output terminal separated from a 2.4 GHz signal output terminal. The amplifier has the advantages of low noise, low power consumption, small area and the like, and is especially suitable for serving as a front-end amplifier in a wireless communication device.

The invention discloses a liquid level detection device, which comprises at least one magnetic sensor with zero power consumption; a track vertically arranged in the liquid to be measured in a position opposite to the magnetic sensor; a floating ball on the liquid surface; a positioning sheet fixed on the floating ball; and a magnet fixed at one end of the positioning sheet, wherein the other end of the magnet is arranged in the track. The magnetic sensor made of magnetically bistable alloy filaments can induce the position of the floating magnet to convert liquid level into an electric signal, which is transmitted remotely through a cable wire, and the sensor detects the level height according to the induction of magnets at corresponding height without using a power supply and mechanical contacts, thus obviating the generation of electrical sparkles, saving power and achieving safe operation, no mechanical contacts and high reliability. The detection result can be transmitted remotely beyond 1,000 meters to achieve remote detection. The liquid level detection device has the advantages of simple structure, practical use, and wide application range, and is used for remote level detection of inflammable liquid and for remote level detection of liquids of other fields such as chemical engineering, mine and civil fields.