100results about How to "Achieve one-way flow" patented technology

The invention discloses an active pump type energy-regenerative damping system, which comprises a pump type energy-regenerative damper, a one-way valve train, a hydraulic motor, an energy storage device, a generator, a storage battery and a controller, wherein a one-way piston valve is arranged on a piston of the pump type energy-regenerative damper; a one-way valve A and a one-way valve B in the one-way valve strain are arranged at an oil outlet and an oil inlet of the pump type energy-regenerative damper respectively; an oil inlet of the hydraulic motor is connected with the one-way valve A through an oil tube A; a one-way valve C is arranged at an oil outlet of the hydraulic motor, and is connected with the one-way valve B through an oil tube B; the energy storage device is communicated with the oil tube B through an oil tube C; a rotating shaft of the hydraulic motor is connected with the generator; the generator is connected with the storage battery and the controller through an electric wire and a control line respectively. According to the active pump type energy-regenerative damping system, vibrating energy can be recovered, active damping control can be realized, and the system is simple in structure and high in reliability, and can be used for a plurality of places such as vehicles and bridge buildings.

The invention discloses a dual-input full-isolation integrated current transformer. The dual-input full-isolation integrated current transformer comprises a current type full-bridge transformation circuit of a first front-stage input port, a series resonance full-bridge transformation circuit of a second front-stage input port, a high-frequency isolation transformer and a back-stage rectifier circuit. A current type full-bridge transformer is used to realize inversion of a high-frequency square wave of an input direct-current current source and achieve soft switching of a switch tube in the adopted phase shift PWM (Pulse Width Modulation) control way at the same time; a series resonance transformer is used to realize transformation of a high-frequency sine current of an input direct-current voltage source; a multi-winding transformer is used to realize coupling isolation transmission of the high-frequency square wave current and the sine current on the input sides; the two input ports cannot be influenced by transformer voltage clamping; and all the primary winding voltages of the transformers are reduced value of output voltage. Moreover, the introduced series resonance process that a resonance inductor and a resonance capacitor have the same frequency as a switch realizes transformation from an input power source to a resonance current source and achieves switch changeover of all power tubes at a zero crossing point of resonance current so as to reduce circuit loss.

The invention relates to a two-body nasal washing device, which comprises a washing liquid bottle, a liquid inlet pipe, a bracket, a liquid outlet one-way valve, a vent hole, an air inlet hole, a liquid outlet pipe, a recovery head, and a liquid return pipe , liquid return one-way valve, recovery bottle; the liquid outlet one-way valve is connected directly above the lotion bottle; one end of the liquid outlet one-way valve is connected with a liquid outlet pipe; the end of the liquid outlet pipe is connected with an outlet liquid head; the liquid return one-way valve is connected directly above the recovery bottle; one end of the liquid return one-way valve is connected to the liquid return pipe; the end of the liquid return pipe is connected to the recovery head; There are air intake holes and ventilation holes. Its advantages are as follows: high user utilization rate, easy to control the flushing pressure of nasal washing liquid by squeezing the washing liquid bottle during use, realizing one-way flow of nasal washing liquid, after cleaning from one nostril, it enters the recovery bottle through the other nostril , The nasal wash liquid can be recycled, reducing the pollution of the nasal wash liquid to the surrounding environment, and the washing speed is controlled by the user's hand, the operation is simple, and the comfort is good.

The invention relates to waste gas treatment equipment and method and belongs to the field of environmental protection equipment. The waste gas treatment equipment comprises an activated carbon adsorption box, a spray tower and a circulating water tank, wherein the activated carbon adsorption box and the circulating water tank are both communicated with the spray tower; the activated carbon adsorption box comprises a box body, an adsorption plate, a limiting device, a positioning device and a driving device; the limiting device is mounted in the box body; the adsorption plate is mounted on thelimiting device; the positioning device is in contact with the adsorption plate; the driving device is connected with the adsorption plate; the spray tower comprises a spray tower device, a sprayingdevice and a cyclone device; the spraying device and the cyclone device are both mounted in the spray tower device; the spraying device is positioned above the cyclone device; the circulating water tank comprises a circulating water tank device, a sludge conveying device, a blow-down apparatus and a water supply device; all the sludge conveying device, the blow-down apparatus and the water supplydevice communicate with the circulating water tank device; and both the box body and the sludge conveying device communicate with the spray tower device. The working efficiency is improved, and the waste gas treatment is complete.

A diaphragm compressed valve-less micropump belongs to the field of microfluidic delivery and control and is characterized in that the valve-less micropump is driven by a miniature vibration motor and capable of running under low voltage of 3V. The diaphragm compressed valve-less micropump mainly comprises the miniature vibration motor 1, a button cell 2, a silicon rubber diaphragm 3, a pump cavity 4, a conical diffusion passage 5, a conical contracting passage 6, a left water hole 7, a right water hole 8, a micropump inlet 9, a micropump outlet 10, a pump body 11, a button cell holder 12 and a spring piece 13. The diaphragm compressed valve-less micropump overcomes the defects of high driving voltage and complicated processing of the existing valve-less micropumps and is driven by the miniature vibration motor and capable of running under the low voltage of 3V, and accordingly, the driving voltage of the micropump is reduced and stability in running thereof is improved.

The invention relates to a one-way valve. The one-way valve is characterized by comprising an inlet inner tube, a threaded sleeve, a valve membrane and an outlet inner tube; the inlet inner tube is connected to the inlet side of the valve membrane in a sleeved manner, the threaded sleeve is connected to the connecting end of the inlet inner tube in a sleeving manner, the outlet inner tube is connected to the outlet side of the valve membrane in a sleeved manner, and the outlet inner tube is connected with the threaded sleeve and ejects the valve membrane; and outer threads are arranged at the two ends of the inlet inner tube, sealing protrusions are arranged at the portions where the inlet inner tubes are connected with the valve membrane, the thickness of a connecting ring in the periphery of the valve membrane is large, and sealing grooves are formed in the two sides of the connecting ring. According to the one-way valve, one-way flowing of fluid is achieved in the manner that a heavy membrane flap of a valve body moves, and the one-way valve has the beneficial effects of being reliable in connection, simple in structure, good in maintainability, long in service life and the like.

The invention discloses an intelligent waterproof and heat dissipation power cabinet suitable for outdoors, including a power cabinet house, the bottom of the power cabinet shell is provided with a power cabinet base which is integrally spliced. The front side of the power cabinet shell is provided with a power cabinet inlet with an open structure, the two sides of the power cabinet inlet are provided with sealing plates welded on the power cabinet shell, the inner cavity of the power cabinet shell is provided with a partition plate distributed crosswise, and the top end of the power cabinet inlet is provided with a double-joint loading drum installed on the power cabinet shell. The power cabinet comprises a controller, a temperature sensor, a humidity sensor and a fan sliding along a track. The invention adopts a double-joint loading drum to integrate the anti-theft roller curtain and the waterproof cloth, and the waterproof cloth and the sealing plate are matched to block the rain water from the waterproof cloth. Through the pre-judgment and early operation of the controller, the waterproof cloth can be operated ahead of time before the arrival of the rain and snow weather, and the reliability of the waterproof device can be increased. Movable fan to improve heat dissipation efficiency by setting temperature sensors.

The invention provides an ultra-high purity hydrogen separator. The ultra-high purity hydrogen separator comprises a shell taking the shape of a circular pipe and a coil spirally wound outside the shell, a first plug and a second plug are arranged at the end part of the shell, the first plug is provided with an ultra-high purity hydrogen outlet, the outlet is communicated with an ultra-high purityhydrogen outlet pipe, the second plug is provided with a mixed hydrogen inlet, the inlet is communicated with a mixed hydrogen inlet pipe through the coil, the shell is divided into three cavities bya first baffle plate and a second baffle plate, a working cavity is internally provided with a palladium membrane pipe and a liner pipe, a waste gas outlet is arranged on the outer wall of the shell,and the outlet is communicated with a waste gas outlet pipe and a waste gas collecting cavity. The disclosed ultra-high purity hydrogen separator has the characteristics of simple and compact structure, safety, reliability and long service life, and is suitable for separating various mixed hydrogen systems; the separating efficiency of hydrogen reaches more than 90%, and the purity of the hydrogen reaches more than 99.9999%.

The invention relates to the technical field of mechanical transmission, and discloses an oil leakage prevention type transmission part with good lubricity. The oil leakage prevention type transmission part comprises a body, a leakage prevention mechanism, a first oil outlet hole and a second oil outlet hole. Teeth and tooth valleys are arranged on the outer side of the body, the teeth and the tooth valleys are adjacently arranged, an annular groove is further formed in the body, an opening of the annular groove faces outwards, at least six oil storage grooves are annularly formed in the outerside of the annular groove in an array mode, and the inner side ends of the oil storage grooves communicate with the annular groove. At least six leakage-proof mechanisms are arranged at the outer side ends of the oil storage grooves, the leakage-proof mechanisms correspond to the tooth valleys correspondingly, and oil storage cavities are formed in the outer sides of the oil storage grooves; andthe inner side ends of the first oil outlet hole and the second oil outlet hole correspondingly communicate with the oil storage cavities, and the outer side ends of the first oil outlet hole and thesecond oil outlet hole correspondingly correspond to the tooth surfaces of the teeth. The problems that lubricating oil is wasted and the lubricating effect is poor due to oil leakage in the using process of vertically placing the gear in the prior art are solved.

The invention discloses a maintaining device for a steel wire rope of a building tower crane. The maintaining device comprises a rectangular shell. The maintaining device can be installed on the steelwire rope, located above a lifting hook portion, of the tower crane. By means of the moving characteristic of the steel wire rope in the working process, kinetic energy of the part is differentiatedinto kinetic energy of the device, thus internal engine oil can be sprayed to the surface of the steel wire rope under the effect of air pressure, thus the steel wire rope can be maintained, the performance of the steel wire rope is improved, and the potential safety hazard is reduced. Moreover, the device is provided with a size limiting type part butt joint installing mechanism of a sphere structure, two parts can be connected, and meanwhile, the angle rotating effect between the two parts is not influenced. In addition, the device is provided with a piston space sealing type space medium compressing mechanism, the mechanism can carry out space compressing on media at one end of the mechanism in the moving process, thus liquid is compressed, and the high-pressure state is formed. In addition, the device is provided with a size limiting type liquid one-way flow mechanism of a spherical structure, and on the premise of bearing large pressure, one-way flow of the liquid is achieved.

The invention discloses a check valve. The check valve comprises an inlet inner tube, a threaded sleeve, a valve diaphragm and an outlet inner tube. The inlet inner tube is sleeved on one side of a valve diaphragm inlet, the threaded sleeve is sleeved at a connection end of the inlet inner tube, the outlet inner tube is sleeved on the valve diaphragm outlet side, and the inlet inner tube is connected with the threaded sleeve and abuts against the valve diaphragm. By the aid of the mode, the check valve has the advantages of being reliable in connection, simple in structure, good in maintenance, long in service life and the like.

The invention discloses a power distribution switchgear with high safety performance, and belongs to the technical field of power distribution switchgears, an outer water cooling pipe is communicated with an inner heat conduction pipe to realize large-range ventilation and heat conduction operation in a cabinet body, a first source extinguishing pipe is arranged on the inner side of the inner heat conduction pipe, and the bottom end part of the first source extinguishing pipe is connected with a second source extinguishing pipe extending to the upper part of a switch assembly. When abnormal high temperature or spontaneous combustion occurs at the switch assembly, the ventilating fan is automatically switched off, an air inlet source is blocked, then a plurality of hot melting strips on the second source extinguishing pipe are subjected to hot melting, the fire extinguishing agent in the second source extinguishing pipe overflows, and meanwhile a bearing piston is separated from the top of the first source extinguishing pipe due to the fact that the top loses magnetism due to the influence of high temperature; the bearing piston falls under the action of gravity to press source extinguishing gas in the first source extinguishing pipe into the second source extinguishing pipe, the fire extinguishing agent in the second source extinguishing pipe is driven to be sprayed out to cover the switch assembly and the cable, the source extinguishing gas and the fire extinguishing agent are matched with each other, the source extinguishing area is enlarged, and the source extinguishing effect is improved.

The invention discloses a unidirectional flow project for seawater in high-level downflow weirs, which comprises the subproject of building anti-surge dams and high-level downflow weirs at coastal mud flats and shallow waters along the coast so as to form a tidewater-accommodating reservoir. The crest level of the high-level downflow weir is lower than the local flood line in the process of tide rising and higher than the local low-water line in the process of tide falling; the high-level downflow weir is a continuous wall made of reinforced concrete slabs or in other dam structures; the tidewater-accommodating reservoir is formed by encircling the high-level downflow weir with the anti-surge dam and is provided with a water intake gate or a water intake culvert which is communicated with a main water delivery canal, and the main water delivery canal is communicated with branch canals; a main drainage canal of the anti-surge dam is provided with a drainage sluice; and the two sides of the high-level downflow weir are respectively provided with a riprap revetment. The project disclosed by the invention has the characteristics of obvious energy conservation effect, simple operation management, capability of improving environment and creating conditions for tour and sightseeing, and the like; and meanwhile, the project disclosed by the invention is widely applied to the engineering of reclaiming land from the sea, sea farming engineering, seawater lifting utilization projects, environmental reconstruction engineering and coastal urban construction engineering at coastal mud flats and shallow waters along the coast.

The invention relates to the field of air conditioning equipment, in particular to a self-cleaning air interchanger. A self-cleaning air ventilation device comprises a ventilation device body. The ventilation device body comprises an air suction and exhaust mechanism, a filtering mechanism and a dust collection mechanism which are communicated in sequence; by arranging the air draft impeller, the exhaust impeller, the first ratchet mechanism, the second ratchet mechanism, the filter cylinder, the guide cover, the guide cylinder, the collecting cylinder, the inner blocking ring, the outer blocking ring and the backflow air channel formed in the upper portion of the guide cylinder, the exhaust impeller is driven to rotate through reverse rotation of the driving motor, then reverse blowing is conducted on the filter cylinder, and therefore the filtering effect is improved. Dust is collected in a centralized manner through a guide cover, a guide cylinder and a collecting cylinder; in addition, the air flow blown in the reverse direction is guided out of the room through the backflow air channel, the air flow is exhausted, the continuous dust collection effect is guaranteed, the filter cartridge is cleaned, the equipment maintenance period is prolonged, and use is convenient.

The invention discloses a heat-driven micro-pump experimental device and method for pumping micro-fluid based on micro-fluidic technology in the field of microelectronic mechanical systems. The heat-driven micro-pump is driven by a liquid flowing-in micro-valve, six liquid flowing micro-valves and a liquid flowing-out micro-valve; a liquid inlet pipe, a liquid flow area and a liquid outlet pipe are combined into a whole, temperature sensors are arranged near heating resistors, and are used for detecting the temperature of different positions inside the heat-driven micro-pump in real time and feeding back to a microcontroller, the gas expansion force generated by heating and the deformation between materials are used as driving force, and the liquid is conveyed in the circulating heating mode for each part, so that the conversion between the heat energy and the mechanical energy is realized, the large driving force can be provided, the large diaphragm deformation is obtained under the low driving voltage, the conversion efficiency between the heat energy and the mechanical energy is improved, the stable flow can be provided, and the pulsation phenomenon of the micro-pump is effectively overcome.

The invention discloses a hot pot of a steam cleaning machine. The hot pot structurally comprises an upper plate, a middle plate and a lower plate, an upper sealing ring is additionally plugged between the upper plate and the middle plate, a lower sealing ring is additionally plugged between the middle plate and the lower plate, and the upper plate and the middle plate are compacted and locked through the upper sealing ring and the middle plate and the lower plate are compacted and locked through the lower sealing ring so that a water passing inner cavity can be formed; and the middle plate comprises a front middle plate and a rear middle plate which are formed in a die-cast molding manner, a U-shaped electric heating tube is arranged in an interlayer between the front middle plate and the rear middle plate, a port of the U-shaped electric heating tube extends out of the middle plate, a cold water inlet is formed in the lower end of the upper plate, and a steam outlet is formed in the rear middle plate. The U-shaped electric heating tube is arranged in the middle plate formed by the front middle plate and the rear middle plate in a die-casting manner, the upper portion and the lower portion of the U-shaped electric heating tube are locked through the upper sealing ring, the lower sealing ring and die casting of the upper plate and the lower plate, the water passing inner cavity is formed, and water poured into the hot pot of the cleaning machine can make full contact with the heating middle plate and is heated to evaporate to generate water vapor.

The invention discloses a crankcase pressure self-balancing system for an aviation heavy oil piston engine, which can realize self-balance of internal pressure of the aviation heavy oil piston engine. The internal pressure of a crankcase fluctuates, and correspondingly decreases and increases along with the upward movement and downward movement of a piston. The self-balance refers to that the crankcase can change according to the internal pressure, when the pressure is reduced, air supply is carried out through a front intake mechanical assembly and a crankcase air inlet assembly, so that the crankcase can automatically supply air or discharge air according to cavity inside and outside pressure differences, that is, the air supply is automatically carried out when the pressure of an inner cavity is reduced, air discharge is carried out when the pressure of the inner cavity is increased, and the self-balance of the pressure in the crankcase is achieved. The crankcase pressure self-balancing system for the aviation heavy oil piston engine has the advantages that the air inflow amount and air discharge amount of the crankcase can be automatically adjusted according to the cavity inside and outside pressure differences, without arranging a sensor or requiring manual intervention, so that the balance of the pressure of the inner cavity and the outer cavity of the crankcase can be automatically realized to ensure the engine moving parts to be stably operated.

The invention belongs to the technical field of filtering equipment, and particularly discloses a highly-integrated filtering system which comprises a water tank, wherein the water tank comprises a common machining low-pressure area and a central water outlet high-pressure area which are communicated with each other, the common machining low-pressure area and the central water outlet high-pressurearea are separated by a partition plate, and liquid unidirectionally flows to the central water outlet high-pressure area from the common machining low-pressure area; a primary filtering unit, a cutting oil cooling pump assembly and a flushing pump assembly are arranged in the common machining low-pressure area, and a pressurizing filtering unit is arranged in the central water outlet high-pressure area. The invention further discloses a using method based on the filtering system. Cooling and flushing cutting fluid needed by common machining can be provided for a machine tool, high-cleannessand high-pressure cutting fluid needed by central water outlet can be provided for the machine tool, water tank sharing of common machining and central water outlet functions can be achieved, the integration level is high, the structure is shared, resources are fully utilized, and space occupied area is reduced.

The invention discloses a bladder fistulation tube. The bladder fistulation tube comprises a duct, a water sac, an extension hose and a leakproof assembly, wherein an urine guiding channel and a watersac channel are formed in the duct; an urine guiding outlet corresponding to the urine guiding channel and a water filling opening corresponding to the water sac channel are formed in the rear part of the duct; an elastic pressure valve is arranged in the urine guiding channel; one end of the extension hose communicates with an inlet of the urine guiding channel, and a plurality of first urine inlets are formed in the side wall of the other end of the extension hose; a through hole is formed in the center of the leakproof assembly, and the leakproof assembly can be movably arranged on the duct in a penetrating manner; and a gel layer is arranged on one side of the leakproof assembly, so that the leakproof assembly can be attached on the skin. The bladder fistulation tube disclosed by theinvention can enable urine in the urinary bladder to be completely drained, the problem of urine leakage infection can also be effectively prevented; unidirectional flow of the urine can be realized,and the pressure of the fistulation tube can be controllable; and the duct can also be bent, so that the bladder fistulation tube is convenient for a patient to use and fix.

The invention relates to the technical field of valves, and provides a check valve for fire fighting. The check valve comprises a valve body, wherein the valve body is provided with a water outlet anda water inlet; a valve plate is disposed in an inner cavity of the valve body; the end face, facing the water outlet, of the valve plate is provided with shaft frame plates; a rotating shaft is movably connected with the shaft frame plates in a penetrating mode; two shaft seats are integrally arranged on the valve body, and a through hole is formed in each shaft seat; two ends of the rotating shaft movably sleeve the through holes; the rotating shaft and the circle center of the valve plate are provided with eccentric distances; a torsion spring for resetting the valve plate also sleeves therotating shaft; the diameter, facing the one side of the water outlet, of the valve plate is larger than the diameter, facing one side of the water inlet, of the valve plate; a sealing structure is arranged on the outer circumferential surface of the valve plate; and the sealing structure forms a face contact seal with the corresponding position of the inner cavity of the valve body. Therefore, the action direction of the valve plate of the check valve is consistent with the flow direction of liquid, and the valve plate structure does not need to be arranged on the valve body, so that the distance between the water outlet and the water inlet is effectively shortened, and the structure of the valve body is simplified; and under the same specification, the weight of the structure of the valve plate at least reduces by 50% compared with the prior art.

Disclosed is an oral cavity cleaning spray-washing instrument for the stomatology department. The oral cavity cleaning spray-washing instrument comprises a box body assembly (1), a piston assembly (2)arranged in the box body assembly (1) and a supporting assembly (3) arranged outside the box body assembly (1), wherein the box body assembly (1) comprises a box body (11); a first through hole (111)is formed in the box body (11); the supporting assembly (3) comprises a connecting frame (31); and one end of the connecting frame (31) is aligned with the first through hole (111) and is fixedly connected with the side surface of the box body (11). A partition plate is arranged in the box body, and a first piston and a second piston are arranged above and below the partition plate, so that spraywashing and waste liquid suction can be carried out at the same time, time is saved, and efficiency is improved.

The invention discloses a maintenance device for building tower crane wire ropes, which comprises a rectangular shell. The invention can be installed on the steel wire rope above the hook of the tower crane. After listening to the movement characteristics of the steel wire rope during work, the kinetic energy of this part can be divided into the kinetic energy of the device, so that the internal engine oil can be sprayed to the steel wire rope under the action of air pressure. Surface, so as to maintain the wire rope, improve its performance and reduce safety hazards. Moreover, the device has a spherical structure size limit type component docking installation mechanism, which can connect the two components without affecting the angular rotation between the two components Function, in addition, the device has a piston space-sealed space medium compression mechanism, which can compress the space at one end of the medium when moving, so as to realize liquid compression and form a high-pressure state. In addition, the device has a spherical structure size limit type The liquid one-way flow mechanism can realize the one-way flow of liquid under the premise of withstanding large pressure.

The invention relates to the field of solar cell power generation and energy storage, and particularly to a novel solar power generation and energy storage double-function integrated device structureand a preparation method thereof. The novel solar power generation and energy storage double-function integrated device structure comprises: a light absorption layer for generating photo-induced electrons and photo-induced holes, and at least one pair of first energy storage structure layer and second energy storage structure layer, wherein the first energy storage structure layer and the second energy storage structure layer respectively contact with the light absorption layer; and when the light absorption layer generates the photo-induced electrons and the photo-induced holes, the first energy storage structure layer generates an energy storage chemical reaction by utilizing the photo-induced electrons, and the second energy storage structure layer generates an energy storage chemical reaction by utilizing the photo-induced holes. According to the invention, the first energy storage structure layer and the second energy storage structure layer use the reduction and oxidation capabilities of photo-induced electrons and photo-induced holes at the same time to store energy, and the power generation and energy storage dual-function integrated device structure has the characteristicsof high comprehensive energy utilization efficiency and mutual promotion of charging and discharging processes.

The invention belongs to the field of experimental oscillators, and in particular relates to a self-ventilating water bath constant temperature oscillator, comprising a box body, a water bath is arranged in the box, an oscillation plate is arranged in the water bath, and the oscillation is The bottom of the plate is equipped with a driving mechanism for driving the reciprocating movement of the oscillating plate, the side wall of the box body is provided with an air intake pipe, the inner side wall of the box body is fixedly connected with a condensation box, and a level is installed in the condensation box. The set condensate screen plate is provided with cooling fins, the bottom of the condensation box is fixedly connected with a return pipe, and the upper end of the condensation box is fixedly connected with an exhaust pipe that communicates with the outside of the box. The invention can promote the exchange of the air in the box and the outside through the reciprocating movement of the magnetic slider, no need to set other air convection devices, reduce the power consumption, and the water vapor carried in the air condenses on the condensing screen plate, reducing the evaporation consumption of the water bath water, ensuring Its constant temperature water bath effect.

The invention relates to a blackboard with a solar dust collection frame, and belongs to the technical field of teaching equipment. The blackboard comprises a blackboard body, the frame, a first dustcollection device, a second dust collection device and a solar power generation device, wherein the frame is arranged on the periphery of the blackboard body, the frame is arranged to be a hollow closed channel, the first dust collection device comprises a first dust collector, a first dust suction main pipe, a first dust suction pipe and first dust suction holes, the second dust collection devicecomprises a second dust collector, a second dust collection main pipe, a second dust collection pipe and second dust collection holes, the solar power generation device comprises a solar cell and a storage battery, and the solar cell is installed outside a window. According to the blackboard with the solar dust collection frame, the first dust suction device and the second dust suction device arearranged so that dust on the surface of the blackboard can be sucked in all directions, the dust collection efficiency is high, and the dust collection is thorough; and the solar power generation device is arranged so that energy can be effectively saved, the physical health of students in a classroom can be protected against hurt, and good teaching environments in the classroom can be kept.

The invention discloses a high-stability mechanical equipment shock-resistant machine base, and belongs to the field of mechanical equipment shock-resistant machine bases. A convex structure formed by a movable plate and a bearing plate is arranged between a pair of buffer gaskets; the bottom of mechanical equipment is connected to the bearing plate; and during working, the pair of buffer gaskets arranged up and down plays a preliminary damping role; and meanwhile, damping liquid guide sleeves are arranged on a plurality of liquid guide tables one by one; a plurality of backflow bent pipes are distributed on the outer sides of the damping liquid guide sleeves; the tops of the backflow bent pipes are connected with the movable plate through buffering backflow pieces; and vibration is offset through relative reciprocating motion of a movable barrel and a positioning barrel and relative reciprocating motion of the buffering backflow pieces and the backflow bent pipes, so that the buffering effect on the mechanical equipment is further achieved; and in addition, as a liquid storage cavity and a cooling liquid cavity are filled with cooling liquid, in the up-down vibration process, the buffering and damping effect is enhanced by utilizing the one-way flowing of the cooling liquid, and good cooling effect on the mechanical equipment is achieved by utilizing the cooling liquid circulating in the one-way mode.

The invention relates to a fuel pump delivery valve, and particularly relates to a fuel pump valve element. The fuel pump valve element comprises a plunger bushing, wherein a plunger cavity and an outlet channel are axially formed in the plunger bushing, the plunger cavity communicates with the outlet channel through a step round hole, a guide sleeve is arranged in the outlet channel, a spherical valve element is arranged between the lower end of the guide sleeve and the upper end surface of the step round hole, a return spring is arranged in an inner hole which is formed in the upper end of the guide sleeve, the lower end of the return spring is limited and fixed by virtue of a step formed by the inner hole of the guide sleeve, the upper end of the return spring is limited and fixed by virtue of a delivery valve spring seat, and the delivery valve spring seat is fixed to the interior of the outlet channel. According to the fuel pump valve element, a steel ball is matched with a conical surface at an outlet of the plunger bushing, so that the processing requirement is reduced. Compared with a traditional ball valve, the guide sleeve structure is designed in the fuel pump valve element, so that the axial movement of the return spring and the ball is guaranteed.

The invention belongs to micro flow pump technology field in precision machinery, which refers to micro film pump, which is made up of an upper and a subjacent bracket, a piece of cover, a film and a double-swage beam; the two brackets are integrated together, the cover piece, film and cushion are pressed and overlapped between the two brackets; there has a ventilation hole in the middle part of the upper bracket to make the piece extrude out, the cover piece has two ventilation holes acted on liquid inlet and outlet; the middle part of the film forms liquid storing, and flow area, the area includes liquid inlet, the first micro valve, pump cavity, the second micro valve whose direction is the same to the first micro valve direction, liquid outlet, the bottom of the area is pump film, the cover combines with the film and forms the pump. The structure of the invention is simple, it is reliable.