111results about How to "Not burned out" patented technology

The invention discloses a polar electricity dust removing device with bagged dust collection, which comprises a dust remover shell, a smoke gas inlet, a uniform air board, a smoke gas outlet, dust buckets, filtering bags, electrode wires and a high-voltage insulating compartment, wherein, a plurality of rows of cloth bags are evenly arranged at interval inside the shell, and the high-voltage electrode wires are arranged at the circle center of a concentric circle of every four cloth bags and connected with a power source through the high-voltage insulating compartment arranged at the top of a dust remover; the uniform air board is arranged under a plurality of rows of filtering bags at the lateral wall of the dust remover shell close to the smoke gas inlet, multiple levels of dust buckets are arranged under the multiple rows of filtering bags, and the smoke gas outlet is arranged above the multiple rows of filtering bags at the lateral wall of the dust remover shell. The polar electricity dust removing device with bagged dust collection has the advantages of simple and unique structure, superior technical performance, smaller resistance, effective overcoming of the reverse corona phenomenon and good dust removing effect, etc. The polar electricity dust removing device with bagged dust collection improves the integral dust removing efficiency under the agglomeration action of electrostatic fields and the interception action of the cloth bags, effectively protects the filtering bags from being burned out by discharge sparks by adopting protective cage structure, and reduces device cost by substituting the steel polar plates with the filtering bags.

The invention discloses a device and a method for searching a fallen unmanned plane. The device comprises a plane falling monitoring modules which are arranged on an unmanned plane and connected to each other and a power supply module having a positioning function; the plane falling monitoring module is connected to a power portion of the unmanned plane for monitoring whether the power portion is abnormal in real time and controls to output a first control signal to a power supply module; and a power supply module supplies power to the unmanned plane.

The invention provides an apparatus and a method for coal powder cyclone entrained flow gasification, and relates to a gasification furnace and a gasification method. In the prior art, a nozzle of the traditional gasification furnace is easily subjected to overburning, a residence time of dry coal powder in the furnace is short, and liquid residue formed by coal powder gasification does not stay on the wall surface. With the present invention, the problems in the prior are solved. According to the apparatus, a top nozzle is arranged on the top of a furnace, a cavity between an inner cylinder and an outer cylinder is a water vapor nozzle, and four oxidation agent nozzles are uniformly distributed and arranged along the outer wall on the upper end of a cylindrical gasification chamber. According to the method, 1, pressure in the cylindrical gasification chamber is 3 Mpa, and an operation temperature is 1500 DEG C; 2, dry coal powder is conveyed into a hearth with a coal powder nozzle through N2 or CO2 carrying in a direct current manner or a cyclone manner, and water vapor is conveyed into the hearth with a water vapor nozzle; and 3, oxygen is conveyed into the hearth concurrently through the four oxidation agent nozzles, and a layer of a molten slag film is formed on the inner wall of the cylindrical gasification chamber, and is subjected to a gasification reduction reaction under a high temperature condition to generate synthesis gas so as to achieve coal powder cyclone gasification. The apparatus and the method are applicable for clean coal gasification.

The invention discloses a method for controlling a rotation speed of an outdoor fan of an air conditioner. The method includes: under a refrigeration mode, acquiring an outdoor environmental temperature value and an indoor set target temperature value, and calculating a temperature difference value between the outdoor environmental temperature value and the indoor set target temperature value; according to a temperature difference range of the temperature difference value, searching a corresponding fan operation mode from a preset corresponding relation between temperature difference ranges and fan operation modes; controlling the outdoor fan of the air conditioner to operate according to the searched fan operation mode. The invention further discloses a device for controlling the rotation speed of the outdoor fan of the air conditioner. The method and the device for controlling the rotation speed of the outdoor fan of the air conditioner have the advantages that operation efficiency of the air conditioner is improved, energy consumption and noise pollution in operation of the air conditioner is reduced, and accordingly comfort in use of the air conditioner is promoted for users; in addition, when the outdoor environmental temperature is high, the air conditioner can also operate for a long time to quickly cool indoors to a target low temperature.

The invention relates to a preparation method of stannous selenide nanospheres, belonging to the technical field of nano material preparation. The method comprises the following steps: uniformly mixing tin power and selenium powder, and pressing into a pressing block; putting the pressing block in a graphite pot, and putting the graphite pot into a copper pot anode in a reaction chamber of a direct-current arc discharge device; introducing circulating cooling water into the condensation wall and copper pot anode; carrying out discharge reaction in argon or / and nitrogen for 3-5 minutes while keeping the discharge voltage at 20V and the current at 100A; and after the reaction finishes, passivating in an argon environment, and collecting the grey-black powder SnSe nanospheres on the side surface of the inner cavity of the condensation wall. The sample prepared by the method has the advantages of high purity and favorable crystallinity. The preparation process does not need any substrate, template or catalyst, and thus, is environment-friendly. The method has the advantages of short preparation time, low energy consumption, low cost and high repeatability. The product has potential application value in the aspects of solar cell conversion, holographic recording, near-infrared photoelectric devices, recyclable lithium ion batteries and the like.

The invention is suitable for indoor / outdoor high-brightness lighting and provides an LED module and LED lamps which comprise a substrate, a high-power LED arranged at one surface of the substrate, a control circuit and a base plate arranged at the other surface of the substrate; the other surface of the base plate is embedded with a bionic radiating fin provided with at least one radiating column; and each radiating column is provided with fins of which the cross sections are in a shape of quasi-cactus columnar stem like the shape of the Chinese character SA; the control circuit is provided with a main controller, an intelligent temperature controlled circuit and a driving circuit which are connected with the main controller; and the main controller is provided with a communication port. The bionic radiating fin is provided with a plurality of radiating columns of which the higher ones and the shorter ones are arranged at intervals, and the joints of the higher radiating columns are higher than the joints of the shorter radiating columns. The radiating fins are provided with radiating holes. The radiating column in the invention has a quasi-cactus columnar stem structure borrowing the idea from the radiating structure of the cactus in a high-temperature condition, thus having good radiating effect and high reliability.

The invention relates to the field of the textile processing, and particularly discloses a singeing device for textile. The singeing device for the textile comprises a roller, a rotation shaft, a singeing unit and a fuzz-absorbing unit. The rotation shaft is coaxially and fixedly installed in the roller. A steam chamber is formed between the outer wall of the rotation shaft and the inner wall of the roller. The outer wall of the roller is provided with an installing through hole for installing the singeing unit, and the axis of the through hole and the radius of the cross section of the rollerare located in the same straight line. The singeing unit comprises an installing box, a communicating pipe, a spring, a fuzz-absorbing pipe and an electric heating wire. The installing box is coaxially and fixedly installed in the installing through hole. One end, away from the rotation shaft, of the installing box is an opening. The fuzz-absorbing pipe is coaxially and slidably installed in theinstalling box. One end, adjacent to the opening, of the fuzz-absorbing pipe is fixedly provided with a fuzz-absorbing plate. The fuzz-absorbing plate is provided with a first through hole communicated with the fuzz-absorbing pipe. The electric heating wire is slidably installed in the fuzz-absorbing plate. One end of the spring is fixedly connected with one end, adjacent to the rotation shaft, ofthe fuzz-absorbing pipe. The scheme is capable of cleaning the fuzz on the surface of fabric, and preventing the surface of the fabric from being scalded and damaged by the singeing unit.

The present invention belongs to the field of electrical equipment, and concretely discloses a fireproof electric meter box. The inside of the electric meter box is monitored through sensing devices on the electric meter box, and once the inside of the electric meter box is caught on fire by short circuits or circuit ageing, a fire extinguishing apparatus on the electric meter box is started to put out the fire source.

The invention discloses a power supply device of a semiconductor laser and a constant-current source. The power supply device at least comprises an acquisition card, a first power supply, a second power supply and a third power supply, wherein the acquisition card is used for generating an input signal, the first power supply is connected with the acquisition card and the semiconductor laser, thesecond power supply is used for providing a working voltage for the first power supply, the third power supply is used for providing a working voltage for the semiconductor laser, the first power supply comprises an operational amplifier, a negative feedback circuit, a transistor, a diode and a first resistor, a first input end of the operational amplifier is connected with the acquisition card, asecond input end of the operational amplifier is connected with an output end of the operational amplifier, a first end of the transistor is connected with an output end of the operational amplifier,a second end of the transistor is connected with the semiconductor laser, and a third end of the transistor is connected with ground by the first resistor. By the mode, large-power, rapid-response and stable current input can be achieved, and the test efficiency of a semiconductor laser chip is improved.

An electronic ballast based LED lamp tube comprises a load circuit, an AC / DC conversion circuit, a stroboflash-preventing circuit, a separation circuit and a compatible electronic ballast power circuit, wherein the load circuit comprises an input end A, an input end B, an input end C and an input end D, a plurality of mutually-parallel LED lamp branch circuits are arranged between the input end A and the input end B, and each LED lamp branch circuit comprises a first diode, an LED lamp and a second diode which are sequentially connected in series. The positive pole of the first diode is connected with the input end A, the negative pole of the second diode is connected with the input end B, third diodes are arranged among the LED lamp branch circuits, the positive poles of the third diodes are connected with the negative pole of the LED lamp of one LED lamp branch circuit, and the negative poles of the third diodes are connected with the positive pole of the other LED lamp branch circuit. LED lamps in the load circuit are mutually connected in series through the third diodes to form an LED serially-connected unit, and the input end C and the input end D are connected to two ends of the LED serially-connected unit.

The invention provides a power-off protection system for an electronic product drop process. The system comprises an acceleration sensor, wherein the acceleration sensor is connected with an information processing circuit; the processing information of the information processing circuit is controlled by a control circuit; and the acceleration sensor, the information processing circuit and the control circuit are all arranged in an electronic product. Compared with the prior art, the power-off protection system for the electronic product drop process can sense whether the electronic product is in a dropping state or not and cut off the power before the electronic product touches the ground so as to protect the internal circuit of the electronic product from further burnout.

The invention discloses a protection control circuit of an electric extinguisher. The protection control circuit comprises a DC-DC voltage reducing circuit, a 555 time delay control circuit, a P-MOS transistor control circuit, a first N-MOS transistor control circuit, a second N-MOS transistor control circuit and an overcurrent turn-off circuit; the input end of the DC-DC voltage reducing circuit is connected with a power supply, the output end of the DC-DC voltage reducing circuit is connected with the 555 time delay control circuit and the P-MOS transistor control circuit, the output end of the P-MOS transistor control circuit is connected with the positive-phase input end of a motor, the first N-MOS transistor control circuit is connected with the positive-phase input end of the motor, a micro control switch (S1) and the overcurrent turn-off circuit, and the second N-MOS transistor control circuit is connected with the negative-phase input end of the motor, a micro control switch (S2) and the overcurrent turn-off circuit. Accordingly, the condition that when the motor does not run in place, the motor continuously runs to be burnt can be prevented, and the condition that the micro control switches are crushed can be avoided.

The invention discloses a gamma-ray wireless sensing monitoring apparatus and a system. The gamma-ray wireless sensing monitoring apparatus comprises a gamma-ray information collection device (11) and a gamma-ray wireless sensing monitoring interface (12), wherein the gamma-ray information collection device (11) comprises a gamma energy spectrum probe and an intelligent scaler, the gamma-ray wireless sensing monitoring interface (12) comprises a microcontroller, an information storage device, an interface converter, a wireless transceiving device and a power supply, and the interface converter is connected between the intelligent scaler and the microcontroller so as to prevent microcontroller burnout. The gamma-ray wireless sensing monitoring system comprises the gamma-ray wireless sensing monitoring apparatus (1), a gamma-ray wireless sensing network (2) and a gamma-ray wireless sensing monitoring center (3), wherein a wireless sensing unit (31) and the gamma-ray wireless sensing monitoring apparatus (1) are subjected to wireless communication through the gamma-ray wireless sensing network (2) so as to achieve gamma-ray remote monitoring.

The invention discloses a starter protector for controlling a starter current limiter. The starter protector comprises a high-side switch, a first sampling circuit, a second sampling circuit, a third sampling circuit and a controller, wherein the high-side switch is used for being connected to a connection path from external control voltage to the control terminal of the starter current limiter in series, and the external control voltage is used for controlling the starter current limiter to carry out the current limiting work; the first sampling circuit, the second sampling circuit and the third sampling circuit are used for collecting the input end voltage, the output end voltage and the external control voltage of the starter current limiter correspondingly; and the input end of the controller is connected with the output ends of the first to third sampling circuits, and the output end of the controller is connected with the control end of the high-side switch so that the high-side switch can be controlled to be switched on or off. The invention further discloses an automobile starting control system. The starter protector can recognize the fault situations of the starter current limiter and a starter in the starting process and disconnect the external control voltage from the starter current limiter automatically in case of faults so that the starter can be protected.

The invention discloses a device for detecting the static and dynamic strength of an automobile transmission bearing. Both sides of a test chamber in a front-rear direction are radially provided withradially loaded electric cylinders and lubricating oil heating devices, and the output shafts of the radially loaded electric cylinders are connected with a radial loading device, and the oil outletsof the lubricating oil heating devices are connected with an oil inlet of the test chamber through an insulating oil pipe. The oil outlet of the test chamber is in series connection with a first refrigerator through an oil pipe, and then is connected with oil return ports of the lubricating oil heating devices. Electric main shafts and the radially loaded electric cylinders are respectively arranged at both sides of the test chamber in the left and right direction. The output shafts of the electric main shafts are connected with the test shaft through a shaft coupler, and the output shafts ofthe axially loaded electric cylinders are connected with the axial loading devices. The device can simulate the transmission oil temperature, can control temperature and flow rate and has the functionof displaying flow at all times. The device realizes the detection of the load strength of the bearing of the automobile transmission under the static condition and the dynamic strength detection ofthe high-temperature dynamic rotation. The detection result is accurate and reliable and the detection efficiency is high.

The invention discloses a low power sonar altimeter. A control power control module receives externally input power supply signal and power supply control signal and supplies power to a 232 communication module and an MSP430 single chip microcomputer. The 232 communication module communicates with the outside and the single chip microcomputer, receives an external control instruction, and sends the external control instruction to the single chip microcomputer so as to control the single chip microcomputer to carry out switch-on and switch-off control and signal emission, reception and processing. The 232 communication module receives a switch control signal emitted by the single chip microcomputer, and switch-on and switch-off are realized under the control of the switch control signal. An MSP 430 single chip microcomputer generates an emission pulse signal and sends the emission pulse signal to an emitting module, receives an echo signal, processes the echo signal to obtain a height result, and outputs the result through the 232 communication module. The single chip microcomputer sends switch control signals to the 232 communication module and a switch circuit so as to control the switch-on and switch-off of the 232 communication module and the switch circuit. The switch circuit receives the input of an external power supply, and the power supply output end is connected to the emitting module and a receiving module to control the switch-on and switch-off of the power supplies of the emitting module and the receiving module. A transmitting and receiving combined transducer carries out transmitting and receiving transduction processing.

The invention discloses a bar-shaped suspension type porcelain insulator which comprises a bar-shaped solid porcelain body and metal caps sleeved at two ends of the solid porcelain body. Six layers of umbrella edges are arranged at equal intervals in the middle of the solid porcelain body; the diameters of the umbrella edges at two ends are equal and smaller than those of the other four layers of umbrella edges; and a pair of ears is extended outwards in radial direction from each external end of the two metal caps. The bar-shaped suspension type porcelain insulator can avoid bridging of rain or ice bars among the umbrella edges, has good self cleaning performance, achieves creep distance as long as 350 mm, thereby improving antifouling and anti-lightning performance; in addition, the solid porcelain body adopts high-strength flitch, thereby effectively improving mechanical tension fracture strength, achieving rated mechanical tension strength of 45kN; since the metal caps are sleeved at binding structures outside two ends of the solid porcelain body, the possibility of the generation of zero value caused by insulation can be avoided; and the lightning impulse withstand voltage of the bar-shaped suspension type porcelain insulator is 140kV, which is very important for thunder prevention and safe operation of lines.

The invention discloses an overcurrent protection circuit with a feedback, and belongs to the field of automatic control. The protection circuit comprises a sampling circuit, a feedback circuit, a switching circuit, and an adjustment circuit. On end of a protection point is connected to the sampling circuit, the other end of the protection point is connected to the feedback circuit and the adjustment circuit, the sampling circuit is connected to the switching circuit, the switching circuit is connected to the adjustment circuit, and the adjustment circuit is connected to the feedback circuit. The sampling circuit conducts voltage sampling when the protection point is triggered by overcurrent. When a sampled voltage reaches a preset value, the switching circuit is conducted, the adjustment circuit is cut off, and the protection point is protected. The overcurrent protection circuit of the invention can form overcurrent protection and quick-breaking protection conveniently. A circuit is automatically cut off when the current exceeds a limit value of the protection circuit to achieve the technical effect of protecting electrical components from being burned out by high current.

The invention relates to a method and device for burning coal slime in a fluidized bed boiler. When the coal slime is burned in a medium and small-capacity circulating fluidized bed boiler, the way of feeding at the top of a furnace chamber is adopted; as the feeding point of the coal slime is near to the outlet of the furnace chamber, a large amount of the coal slime can fly out of the furnace chamber under the situation that the coal slime is not burned completely, and the burning efficiency is very low. The invention discloses the method for burning the coal slime in the circulating fluidized bed boiler, and the technical process of the method is as follows: sending the pasty coal slime into a dense phase region at the lower part of the furnace chamber of the circulating fluidized bed boiler, utilizing a device for burning the coal slime in the circulating fluidized bed boiler to smash the falling coal slime into small particles and disseminate the particles into the furnace chamber, mixing the coal slime with ascending smoke gas and recyclable materials, and then burning in the furnace chamber. The method and the device are used for burning the coal slime in the circulating fluidized bed boiler.

The invention relates to an electric arc lighter which comprises a power assembly, a high-pressure generation device, a shell and electric arc output lines. The electric arc lighter is further provided with a supporting piece, supporting pins at the two ends of the supporting piece are provided with through grooves, the electric arc output lines penetrate through the through grooves and correspond to each other, an installation column is arranged at the bottom of the supporting piece, the supporting piece is connected to the shell through the installation column, and heat insulating pieces are arranged on the electric arc output lines in a sleeved mode and penetrate through the through grooves to be fixedly connected to the supporting piece. Through the heat insulating pieces on the electric arc output lines in the sleeved mode, it is guaranteed that a plastic piece is not burnt at the high temperature, and use of the lighter is not influenced.

The invention discloses a high-speed laser inner hole cladding gun. The gun comprises a main body; the main body comprises a base with an optical fiber connector, a collimating mirror and a focusing mirror, a cladding head middle section, and a machining head section with a refractor frame and a protective mirror; a laser powder feeding head is arranged below the protective mirror; a focusing device is arranged between the collimating mirror and the focusing mirror; the middle section comprises a connecting rod; the connecting rod is connected with the focusing device and the refractor frame;a powder feeding channel, a cooling water channel and a protective gas channel are arranged inside the connecting rod; the powder feeding channel, the cooling water channel and the protective gas channel are communicated with the laser powder feeding head; the base is correspondingly provided with the powder feeding channel, the cooling water channel, an input interface of the protective gas channel and an output interface of the cooling water channel; and the cooling water channel forms a circulating cooling channel in the base, the connecting rod and the machining head section. The providedhigh-speed laser inner hole cladding gun can perform laser cladding on an inner hole of a workpiece and can continuously work for a long time.

The invention relates to a self-ballast LED (Light Emitting Diode) spot lamp. The LED spot lamp comprises a lamp head, an adapter, an air distribution hood, a power supply device, a fan, a lamp body, a light source, a reflection cup and a surface cover, wherein the lamp head is fixedly arranged at the rear end of the adapter; the power supply device is arranged inside the adapter; the air distribution hood is integrally convex, the main body of the air distribution hood is cylindrical, the top of the air distribution hood is provided with an edge overturning outwards, and an air inlet port is formed in the edge; the air distribution hood is fixedly arranged inside the adapter; the fan is fixedly arranged at the bottom of the air distribution hood; the lamp body is fixedly arranged at the bottom of the inner side of the air distribution hood; the light source is attached in the lamp body; the reflection cup is arranged above the light source; the surface cover is arranged above the reflection cup; the reflection cup is fixedly arranged inside the air distribution hood through the surface cover. A magnetic suspension fan is arranged on an aluminum radiator, and a wind deflector device is designed for matching with the fan to form a good wind inlet and outlet radiating loop and exhaust the internal heat of the lamp, thus the difficulty of heat radiation of an LED lamp is solved, and an energy-saving LED lamp with high power of 30W and high light efficiency is realized.

The invention discloses a stand-by circuit. The stand-by circuit comprises a voltage conversion unit, a signal detection and sampling unit, a signal amplification unit, a switch control unit, a signal comparison unit, a transistor and a relay. An input end of the voltage conversion unit is electrically connected with a main power source, and an output end of the voltage conversion unit outputs a direct-current voltage. The signal detection and sampling unit, the signal amplification unit, the switch control unit, the signal comparison unit, the transistor and a coil of the relay are electrically connected with one another in sequence. An armature of the relay is in tandem connection with a power supply circuit of the main power source and a transformer. The invention can switch off the transformer in the stand-by state, and allows stand-by power of a power amplifier to be lower than 0.5W.

The invention discloses an eddy flow abrasion-resistant coal dust gasification furnace, which belongs to the field of coal gasification. The eddy flow abrasion-resistant coal dust gasification furnacecomprises a furnace body, a flange is arranged at an upper port of the furnace body, the furnace body comprises an upper chamber and a lower chamber which are mutually isolated, a water screen connected with a flange is arranged in the upper chamber, a sealed combustion chamber is enclosed by the water screen, a burner assembly communicated with the combustion chamber is arranged at the flange, acoal dust conveyer pipe used for sending the coal dust to the burner assembly is arranged at the flange, a downcomer communicated with the lower chamber is arranged at the lower end of the combustionchamber , a process gas outlet is arranged at the upper part of the lower chamber, and a waste material processing apparatus is arranged at the bottom of the lower chamber. The eddy flow abrasion-resistant coal dust gasification furnace reduces the erosion of coal dust to a coal dust intervention device and attachment of the coal dust in the coal dust intervention device, so that the loss of thecoal dust intervention device is reduced, obstruction of coal dust is avoided, gas efficiency and quality of the gasification furnace are guaranteed, the service life of the gasification furnace is prolonged, and the reliability of the gasification furnace for long-time operation can be increased. The gasification furnace is worth of popularization and usage.

The invention discloses a method for controlling a rotation speed of an outdoor fan of an air conditioner. The method includes: under a refrigeration mode, acquiring an outdoor environmental temperature value and an indoor set target temperature value, and calculating a temperature difference value between the outdoor environmental temperature value and the indoor set target temperature value; according to a temperature difference range of the temperature difference value, searching a corresponding fan operation mode from a preset corresponding relation between temperature difference ranges and fan operation modes; controlling the outdoor fan of the air conditioner to operate according to the searched fan operation mode. The invention further discloses a device for controlling the rotation speed of the outdoor fan of the air conditioner. The method and the device for controlling the rotation speed of the outdoor fan of the air conditioner have the advantages that operation efficiency of the air conditioner is improved, energy consumption and noise pollution in operation of the air conditioner is reduced, and accordingly comfort in use of the air conditioner is promoted for users; in addition, when the outdoor environmental temperature is high, the air conditioner can also operate for a long time to quickly cool indoors to a target low temperature.

The invention discloses a composite startup burner for a powder coal gasification furnace. The composite startup burner comprises an inner burner and an outer burner which are provided with a front necking end respectively and are coaxially sleeved from the inside to the outside, wherein a cooling water jacket adopting a single-spin mode is arranged on the periphery of the outer wall of the outerburner; the front end of the inner burner is provided with an ignition electrode; and the nozzle of the burner is provided with a supersonic atomization device. The composite startup burner adopts supersonic atomization to ensure that the burner has small fluctuations in fuel and atomization airflow rate, and a little change in outlet speed in a process that the back pressure rises continuously so as to ensure the atomization effect and high-temperature flame far from the head of the burner; the composite startup burner adopts a center ignition mode to save an ignition burner to realize the two-in-one function, and adopts a single-spin cooling mode to ensure that the head of the burner is protected from damage under the condition of high temperature and high pressure to prolong the service life of the burner.

The invention relates to the field of signal processing, in particular to an adaptive loudspeaker adjusting system and method. The method comprises the following steps that 1, an input signal is subjected to power amplification to output a driving signal for driving a loudspeaker; 2, the output transient current of a power amplification unit is acquired; 3, the transient impedance is calculated out according to the output transient current; and 4, when it is judged that the change rate of the transient impedance in a unit time is higher than a set threshold, the set threshold is lowered. According to the adaptive loudspeaker adjusting system and method, by acquiring the impedance of the loudspeaker in real time, circuit parameters are adaptively adjusted according to the change characteristic of the transient impedance, and therefore the loudspeaker can be protected from being burned out in real time while the audio performance is guaranteed.

The invention discloses an electric control cabinet with an excellent refrigerating effect. The electric control cabinet comprises an electric box and a refrigerating box, wherein the electric box comprises a box body (1); the box body (1) comprises a first box body (2) and a second box body (3) which are formed through dividing the box body in the middle; a first electric cabinet (4) is arranged in the first box body (2) and is provided with high-voltage components; a second electric cabinet (5) is arranged in the second box body (3) and is provided with low-voltage components; an air outlet and an air inlet are formed in the back surface of each of the first box body (2) and the second box body (3); the refrigerating box comprises a return air channel (6), an air outlet channel (7), an air conditioner (8) and a heat exchanging air channel (9). According to the invention, the air inlet design concept of a refrigeration air conditioner is adopted to enable the electric control cabinet to obtain a better air inlet effect and heat dissipation concept, so that the electric control cabinet is ensured to have a better working environment.

The invention provides a motor overload protection and open-phase protection detecting circuit belonging to the technical field of protection and control for motors. The technical problem to the solved is to provide a circuit for detecting overload and open-phase fault of a motor. The technical scheme is as follows: positive poles of a first rectifier filter circuit, a second rectifier filter circuit and a third rectifier filter circuit are connected in parallel, then connected in series with a diode D19, a potentiometer W1 and a resistor R8 and connected to an output end u1; the negative pole of the first rectifier filter circuit is connected to the positive pole of a diode D18 and the negative pole of a diode D15; the negative pole of the second rectifier filter circuit is connected to the positive pole of a diode D17 and the negative pole of a diode D14; the negative pole of the third rectifier filter circuit is connected to the positive pole of a diode D16 and the negative pole of a diode D13; and the positive pole of a voltage-stabilizing diode D22 is connected in series with a diode D21 and the resistor R6 and then connected to an output end u2. The invention is further used in the coal mine field.

The invention discloses a simple overvoltage protector, and relates to the technical field of electric appliance overvoltage protection. According to the simple overvoltage protector, a fuse is arranged on a power wire in series, an outlet end of the fuse is connected with the negative pole of a voltage stabilizing diode, and the positive pole of the voltage stabilizing diode is connected with the negative pole of a power supply; a voltage stabilizing value of the voltage stabilizing diode ranges from 1 V to 500 V, and a working current of the fuse ranges from 0.01 A to 1000 A. The simple overvoltage protector has the advantages that the simple overvoltage protector can be used individually, and the manufacturing cost is greatly reduced.