42results about How to "Inflow fast" patented technology

The invention provides a piezoelectric pump having a simple structure and high discharge pressure. A first opening (11) is formed at the center of a pump body (10), and a second opening (12) is formed at a position away from the center. The outer periphery of a metal diaphragm (20) is fixed to the pump body (10), and a piezoelectric element (23) is bonded to the center on the rear side of the diaphragm (20). The piezoelectric element (23) has a size covering the first opening (11) but not reaching the second opening (12). When a voltage near the resonance frequency is applied to the piezoelectric element (23), that portion of the diaphragm (20) that faces the first opening (11) and that portion of the diaphragm (20) that faces the second opening (12) are bent and deformed in the directions opposite to each other. This causes fluid to be drawn from either one of the first opening (11) and the second opening (12) and discharged from the other. The piezoelectric pump can have high discharge pressure, which enables the pump to reliably discharge fluid even in conditions where the pressure on the discharge side is high.

The invention discloses a rail type intelligent pesticide spraying vehicle, and belongs to the field of agricultural machinery. The rail type intelligent pesticide spraying vehicle comprises slide rails, support rods, a towing vehicle, a pesticide dilution tank and two spraying devices. The support rods can be erected on ridges, the slide rails comprise first slide rails and second slide rails andare fixedly laid on the support rods, the towing vehicle is slidably arranged on the first slide rails, the pesticide dilution tank is arranged on a bottom plate of the towing vehicle, and the two spraying devices are symmetrically distributed on two sides of the towing vehicle. The rail type intelligent pesticide spraying vehicle has the advantages that the two slide rails are arranged between the ridges, accordingly, the pesticide dilution tank and the spraying devices can be driven by the towing vehicle to carry out operation, and the maneuverability of the towing vehicle can be enhanced;pesticides can automatically flow towards spraying heads to be sprayed, accordingly, spaces of the ridges can be utilized, and the spraying efficiency can be improved; pesticide liquid can be timely replenished by the aid of a water pump and a pure pesticide tank.

The invention provides an electric cooking appliance, which comprises an electric appliance main body in which a cooking cavity is formed; and an odor removal device arranged in the electric appliancemain body, provided with an airflow channel for communicating the cooking cavity with the external environment, and used for removing odor from the cooking cavity through the airflow channel. The odor removal device is provided with the airflow channel for communicating the cooking cavity with the external environment, so that after cooking is finished, water vapor in the cooking cavity, the taste of food, oil fume and the like can be exhausted to the external environment, effective odor removing effect is achieved, various smells such as water vapor, oil fume and the taste of food are prevented from being accumulated in the cooking cavity, the body health of a user is further facilitated, and the cleanliness and the cooking effect of the electric cooking appliance are also improved. Besides, compared with a scheme of arranging an internal circulation channel in the electric appliance main body for odor removal, the scheme is beneficial to improving the odor removal speed, reducing the waiting time of a user, simplifying the product structure and reducing the product size.

The invention discloses coconut processing equipment. The coconut processing equipment comprises a casing, wherein a storage table is arranged on the casing and provided with a coconut processing station, a fixture for clamping coconuts is also arranged in a position, located on the outer side of the coconut processing station, of the casing, and the clamping part of the fixture is located above the storage table. The coconut processing equipment is characterized by further comprising a rotary table rotationally connected to the casing, the rotary table can rotate horizontally with the coconut processing station serving as the rotation center, a telescopic device is vertically arranged on the rotary table, a drive motor is connected with the upper end of the telescopic device, an output shaft of the drive motor is connected with a vertical rotary cutter, and a hole is formed in an area, directly facing the coconut processing station, of the rotary table to form a cutter channel allowing the rotary cutter to pass. Punching operation can be performed at different parts of coconuts through one-time clamping, and integration of punching and juice taking can be realized.

The invention discloses a flow table which comprises a flow guide slot for guiding casting melt and a filling and injecting slot, wherein three filling and injecting openings are opened at the bottom of the filling and injecting slot. According to the flow table provided by the invention, the three filling and injecting openings are opened at the bottom of the filling and injecting slot, so that the flow table can be used for casting and producing three ingot castings every time, thereby improving the production efficiency. Furthermore, when the three ingot castings are cast and produced every time, more melt flow into the flow guide slot, a small part of the melt remain in a natural gas furnace for heat prevention, so that the matching degree of the progress of smelting and casting is high; and the flow of the melt in the flow table is increased, the melt can flow into the filling and injecting slot faster and is exhausted from the filling and injecting openings, so that the temperature of the melt is less lost, the temperature of the melt does not need to be increased specially, thus correspondingly reducing the energy consumption. The invention further discloses an ingot casting processing device with the flow table.

The invention discloses an intelligent pesticide spraying system, and belongs to the field of agricultural machinery. The intelligent pesticide spraying system comprises a sliding rail, supporting rods, a tractor, a pesticide storage tank and two spraying devices, wherein the supporting rods are erected on a ridge, and the sliding rail comprises a first sliding rail and a second sliding rail, andare respectively fixedly laid on the supporting rods; the tractor is slidably arranged on the first sliding rail, and the pesticide storage tank is arranged on a bottom board of the tractor; the two spraying devices are symmetrically distributed at both sides of the pesticide storage tank, and stabilizing pulleys are arranged on the spraying devices and slide on the second sliding rail. By arranging two sliding rails between the ridges, the tractor drives the pesticide storage tank and the spraying devices to operate, so that the mobility of the tractor is enhanced. Meanwhile, the pesticide can automatically flow to a spraying head for spraying, thereby utilizing the space of the ridge, and also improving the spraying efficiency.

The invention relates to medicine feeding equipment, and in particular to equipment convenient for a user to feed medicine to puppies. The invention aims at providing the equipment convenient for theuser to feed medicine to puppies, which can facilitate medicine feeding to the puppies and can protect people from getting bitten by the puppies. The equipment convenient for the user to feed medicineto puppies provided by the invention comprises a medicine feeding shell, a first clamping block and the like, wherein a cylinder block is embedded between the upper part of the inner side of the leftwall of the medicine feeding shell and the upper part of the inner side of the right wall of the medicine feeding shell; pistons are arranged at the inner left side and the inner right side of the cylinder block; the pistons cooperate with the cylinder block; and first through holes are formed in the middles of the left and right walls of the cylinder block and the upper parts of the left and right walls of the medicine feeding shell. With the application of the equipment provided by the invention, medicines can be conveniently fed to the puppies and the effect of protecting the people from getting bitten by the puppies can be achieved; according to the equipment provided by the invention, a ball body is placed in the mouth of a puppy, and then a fixing ring is adopted by a veterinarian for fixing the mouth of the puppy so as to prevent the ball body from being spit by the puppy; and meanwhile, the risk that the veterinarian gets bitten when feeding medicines can be also prevented.

The invention relates to the technical field of chemical material preparation, and especially relates to urea hydrolysis ammonia production equipment. The equipment comprises a raw material dissolvingtank, a raw material storage tank, a reactor, a drain tank and a temperature and pressure reducer, the raw material storage tank is communicated with the raw material dissolving tank through a firstpipeline, and a raw material dissolving pump and a first automatic valve are arranged on the first pipeline; the reactor is communicated with the raw material storage tank through a urea pipeline; a raw material conveying pump and a second automatic valve are arranged on the urea pipeline; the bottom of the reactor is also communicated with a raw material dissolving tank through a liquid-phase pipeline; and a third automatic valve is arranged on the liquid-phase pipeline. When the reactor needs to be overhauled, the third automatic valve is opened, so that a catalyst and urea solution in the reactor automatically flow into the raw material dissolving tank, the catalyst and urea solution in the reactor is stored, and after the reactor is overhauled, the catalyst and urea solution stored inthe raw material dissolving tank can flow back into the reactor again, and the effect of saving the catalyst and urea solution is achieved.

The invention discloses a garbage classified compression device for garbage disposal. The garbage classified compression device comprises a main seat and a compression cavity. A drainage channel is formed inside the front end of the main seat, the drainage channel and the main seat are in welded connection, a feeding inlet is formed in the upper end of the main seat, the feeding inlet and the mainseat are fixedly connected, the compression cavity is located in the lower end of the feeding inlet, an extrusion hammer is arranged at the rear end of the compression cavity, and the rear end of theextrusion hammer is connected with a first hydraulic rod. The garbage classified compression device for garbage disposal is provided with a supporting plate, a second hydraulic cylinder and a secondhydraulic rod, through the action of the second hydraulic cylinder, the second hydraulic rod is driven to move, and then the supporting plate can be retracted; before garbage is poured in, the supporting plate moves towards the front end to be clamped into a groove, thus the effect of sealing the bottom of the compression cavity is achieved, and the garbage is supported and conveniently compressed; and meanwhile, after the garbage is compressed, the supporting plate is put away, the garbage can fall directly, and the next step of clearing is facilitated.

The invention provides an air conditioning system, a control method of the air conditioning system and a computer readable storage medium. The air conditioning system comprises a compressor, an outdoor heat exchanger, an economizer, a first valve, a second valve, a storage and a processor, a first outlet of the economizer communicates with the outdoor heat exchanger, a second outlet communicates with the compressor, the first valve is configured to adjust the quantity of a refrigerant flowing into the outdoor heat exchanger through the economizer, the second valve is configured to communicate or be disconnected with a refrigerant passage between the economizer and the compressor, and the processor is configured to be used for executing a computer program so as to achieve the effects that based on a heating mode, the second valve communicates with the refrigerant passage between the economizer and the compressor to obtain the exhaust superheat degree, and based on the situation that the exhaust superheat degree is larger than the exhaust superheat degree threshold value, the first valve is controlled to reduce the opening degree. According to the air conditioning system, when the exhaust superheat degree is larger than the exhaust superheat degree threshold value, the opening degree of the first valve is reduced, a large number of refrigerants rapidly flow into the compressor through the economizer, and the exhaust superheat degree is reduced.

The invention relates to a hinged bolt which comprises a bolt body and a circulating hole which is formed at the tail part of the bolt body along the length direction, wherein at least one oblique guide hole which is communicated with the circulating hole is also formed on the side wall of the tail part of the bolt body; and the guide holes are arranged from the outer side of the side wall to the inner side of the side wall in a mode of being oblique toward the tail part of the bolt body. Compared with the prior art, the oblique guide holes are arranged at the tail part of the bolt body, which plays a role of guiding a fluid flowing from the hinged body, so that the fluid rapidly and smoothly flows into the circulating hole of the bolt body, the fluid is lifted greatly through the circulating speed of the hinged bolt, at the same time section, the flow rate can be increased by 30%, and the hinged bolt is much suitable for actual using.

The invention discloses a novel oil-immersed transformer in the technical field of oil-immersed transformers, which comprises a transformer body, and a heat dissipation mechanism for accelerating the heat dissipation efficiency of a heat dissipation plate is arranged on the outer side of the transformer body. The side wall of the transformer body is connected with a rotating mechanism used for driving the heat dissipation mechanism to rotate around the transformer body, and the rotating mechanism is matched with the heat dissipation mechanism to rapidly dissipate heat around the transformer body. Each time when the transformer body works with high load and generates heat severely, the rotating mechanism is started and drives the heat dissipation mechanism to move around the transformer body, so that the heat dissipation mechanism rapidly drives air on the outer side of the transformer body to conduct contact heat exchange on the transformer body, the transformer is rapidly cooled, the heat dissipation is mild, and the adverse effects on the transformer body are avoided. And the heat dissipation mechanism is simple in structure, integrated with the transformer body and small in occupied area, and the transformer body is convenient to install and use.

The invention discloses a preparation, separation and storage device of a sodium hypochlorite solution. The device comprises a sodium hypochlorite generator, a storage tank and an air blowing part. The air blowing part is connected with the storage tank and blows air into the storage tank; a material pipe communicated into the storage tank is arranged on the storage tank, and the end, away from the storage tank, of the material pipe extends upwards; a discharging pipe is connected to the sodium hypochlorite generator, and a first material conveying pipe communicated with the discharging pipe and the material pipe is arranged between the discharging pipe and the material pipe; an inclined flow guide rod is arranged in the material pipe, and at least a part of the flow guide rod is lower than the connecting position of the first material conveying pipe and the material pipe. Liquid in materials produced by the sodium hypochlorite generator is guided through the flow guide rod so that the liquid can stably flow into the storage tank, and a storage tank exhaust space is reserved in the material pipe; therefore, the conflict between the discharged hydrogen in the storage tank and the liquid flowing into the storage tank in the material pipe can be solved, and the influence of the gas flow rising in the material pipe on the liquid flowing is avoided. The device is used in the field of water supply and drainage disinfection.

The invention discloses a disposable digestive system department esophagus applicator in the technical field of medical instruments. The disposable digestive system department esophagus applicator comprises an applicator ball and an applicator tube, wherein the applicator ball is in threaded connection with the applicator tube; multiple groups of medicine outlets are formed in the outer wall of the applicator ball; a telescopic rod is fixedly connected to the middle of the applicator ball, and a top ring is fixedly connected to the inner top of the applicator ball; a return spring is fixedly connected between the top ring and the bottom of the applicator ball; the applicator tube comprises an inner rod and an outer tube; the end of the inner rod is fixedly connected with an outward-expanding elastic piece; the outer wall of the inner rod is slidably connected with a clamping sleeve; a clamping spring is fixedly connected between the clamping sleeve and the inner rod; a medicine storagetube is fixedly connected to the middle of the outer tube; and a sealing assembly is arranged at the bottom of the medicine storage tube. The disposable digestive system department esophagus applicator is convenient to feed into the esophagus, relieves the pain of a patient, can allow a medicine to quickly flow out to a diseased part, can control the drug application amount to a certain extent through the pull-out duration of the inner rod, and is simple to operate and safe to use.

The invention relates to a method for operating a wastewater-lifting system, in which wastewater loaded with bulky materials is guided through a bulky material collection tank (4) having at least oneseparating screen arranged in its interior, in which furthermore, during the intake of wastewater, the bulky materials are retained in the bulky material collection tank (4), and precleaned wastewateris fed to a pump (6) via a connection line (5), and in which the precleaned wastewater passes into the liquid collection tank (8) via the pump (6) and via a bypass line (7) connected to the connection line (5). According to the invention, a pivoting flap (12) is additionally provided in the connection line (5), said flap, during the intake of wastewater, closing the connection line (5) apart froma flushing cross section (14) and opening the bypass line (7) and, during the pumping operation, opening the connection line (5) and closing the bypass line (7).

The invention discloses a waste gas dust removal device for carbon material production. Firstly, a discharging system is closed through an isolation mechanism, then a stirring assembly in a mixing system is opened, gas flowing into a gas guide hole is made to rotate through rotation of the stirring assembly, and a protection cover and an exhaust valve are driven to rotate. Then, a water mist system is started, a rotating mist spraying cavity sprays out water mist, waste gas with harmful substances removed is guided in through a gas inlet pipe and falls down after being combined with dust in the waste gas under the action of the water mist, when a certain amount of gas is collected in the shell, vortex is generated through the rotating stirring assembly, the contact area and time of waste gas and water mist are increased, the isolation mechanism is opened to enable the collected dust to rapidly flow out of a pipeline assembly, it can be qualitatively selected that the collected dust flows out of a first pipeline or a second pipeline to be recycled, and the removing effect of the device is improved.

The invention relates to the technical field of sewage treatment, in particular to a sewage source heat pump system for sewage treatment, which comprises a heat pump source system consisting of a heat exchange terminal and a water source heat pump unit and a water circulation system consisting of the water source heat pump unit, a filtering mechanism and a water storage chamber, a filtering pipeline assembly is arranged in the shell and composed of a sewage inlet pipeline, a washing pipeline and a connecting pipeline, and the sewage inlet pipeline and the washing pipeline are arranged in the shell in parallel and connected through the connecting pipeline. The problem that the maintenance cost of a filter shell in the heat pump source treatment system is high is solved, the filter shell in the heat pump source treatment system and the internal structure of the shell are provided, the cost needed for maintaining equipment is reduced, meanwhile, sewage can be recycled, and energy conservation and environment protection are achieved.

The invention relates to the technical field of preparation of chlorine dioxide, and discloses a novel chlorine dioxide generator. The novel chlorine dioxide generator comprises a reaction tank, wherein a jet device which communicates with the cavity of the reaction tank is arranged on the side wall of the upper portion of the tank body of the reaction tank; an opening and closing container is arranged on the lower portion of the cavity of the reaction tank and comprises a fixed portion and a rotating portion which can be connected with each other; the rotating portion is connected with a rotating rod which extends out of the reaction tank; the rotating portion can rotate along with the rotating rod and is connected with or disconnected from the fixed portion; in the connection state, a container with a cavity in the top is formed; in the disconnection state, a leaking opening is formed between the rotating portion and the fixed portion; a liquid draining tube is arranged on the bottomof the reaction tank; and a liquid outlet is positioned below the opening and closing container. The problems that waste liquid is generally drained from a conventional chlorine dioxide generator through a pipe, the waste liquid draining speed of the pipe is over low, and rapid reproduction of the chlorine dioxide generator and then improvement of the production efficiency are not facilitated aresolved.

The present invention relates to gravity spool fillers and methods for gravity filling beverages. The gravity spool filler includes a product pot and a fill valve coupled therewith, the fill valve being configured to limit the fill height in the bottle by means of a return gas tube. Since the regulating valve is exclusively located in front of the filling valve, the regulating valve is used for machine-controlled throttling of the beverage inflow to the filling valve, so that the contact between the beverage in the product pot and the filling valve can be reduced in a targeted manner. As a result of the influence of the hydrostatic pressure, the rise of the beverage in the return gas line is reduced and the filling height can be adjusted precisely without filling height correction or filling height monitoring by means of a probe.

The invention relates to the field of combustion devices of industrial furnaces, in particular to a low-nitrogen burner for an industrial furnace, which comprises a burner shell and a combustion tube, a gas tube is arranged in the burner shell, the combustion tube is arranged at the bottom of the burner shell, the tail end of the gas tube is inserted into the combustion tube, an ignition coil is arranged on the gas tube, and the tail end of the ignition coil is inserted into the combustion tube. A gas spraying head is arranged at the bottom of the gas pipe, and the section shape of the gas spraying head is matched with the section shape of the inner wall of the burner shell. During use, the area of the cross section of an inner cavity of the combustion cavity pipe is larger than that of the cross section of an inner cavity of the combustion pipe, and a certain angle is formed at the joint of the combustion cavity pipe and the combustion pipe, so that mixed gas is released into the combustion cavity pipe through the combustion pipe, combustion of the mixed gas is more sufficient, and the combustion efficiency is improved. The burner further has the advantages of being simple in structure, convenient to operate and easy to implement.

The invention relates to the technical field of automatic hydraulic actuating mechanisms, in particular to an automatic hydraulic actuating mechanism convenient to install, which comprises an adjusting pipe, an adjusting and installing mechanism and a water pressure control device, the water pressure control device and the adjusting and installing mechanism are arranged below the adjusting pipe, and the two ends of the adjusting pipe are fixedly connected with connecting flanges. A valve ball is arranged in the middle in a cavity of the adjusting pipe and rotationally connected with the inner wall of the adjusting pipe, a connecting shell is fixedly connected to the side wall of the adjusting pipe, a valve ball shaft is arranged in a cavity of the connecting shell and rotationally connected with the connecting shell, and the end, close to the valve ball, of the valve ball shaft penetrates through the side wall of the adjusting pipe and rotationally connected with the side wall of the adjusting pipe. The valve ball shaft and the side wall of the adjusting pipe are arranged in a sealed mode, the valve ball shaft is fixedly connected with the valve ball, the executing mechanism can conduct automatic adjustment according to the pressure of cooling liquid, and the cooling effect in the cooling process is improved.

Significant advantages of the present invention: excellent air tightness, excellent thermal insulation performance; especially "safety" is extremely excellent and reliable: the whole board body is a complete and integrated board body formed at one time when the glass is hot-melted into a fluid or plastic state, fundamentally To put an end to the chronic problems of air leakage and separation around the existing vacuum glass, the setting of the reflective separation layer further strengthens the structure of the panel, endowing the product with the safety and reliability of the same life as the building. The fiber and fiber net inside the board can effectively enhance the toughness of the board and improve the impact strength; it has a wide range of applications: non-transparent products are used for insulation and decoration of building walls and roofs, and light-transmitting and opaque products are used for thermal insulation building curtain walls. Transparent and translucent products are used for doors, windows, and domes that require high thermal insulation performance; the installation method is convenient, safe and reliable, and since the thickness of the board body is between 25mm and 90mm, it is beneficial to set up installation grooves, installation edges and board seams for heat preservation.

The invention relates to a gravity-operated tube filler and a method for gravity-operated filling of beverages. The gravity-operated tube filler comprises a product cooker and a filling valve which isconnected with the product cooker. The filling valve is constructed to restrict the filling height in a bottom by means of an air returning tube. Because an adjusting value is speficially arranged infront of the filling valve, the adjusting valve is used for shuttling beverage infilling to the filling valve in a machine-controllable manner so that the influence of the pressure of static fluid between the beverage in the product cooker and the filling valve can be reduced in a targeted manner. Therefore, the lifting height of the bevere in the air returning tube reduces, and furthermore the filling height can be accurately adjusted on the condition of no probe for filling height correction or filling height monitoring.

The invention discloses a compressor assembly and a refrigeration system with the compressor assembly. The compressor assembly comprises two compressors arranged in parallel, an oil balance pipe and a drive device. Each compressor is provided with an oil bath and an oil return opening. The two ends of the oil balance pipe are connected with the oil baths of the two compressors correspondingly. The drive device is connected with the oil balance pipe and each oil return opening. The drive device is arranged to enable lubricating oil in the oil balance pipe to be conveyed to each oil return opening. According to the compressor assembly, the lubricating oil in the compressor at the high oil level of the two compressors can flow into the oil balance pipe under the action of the pressure difference, the lubricating oil entering the oil balance pipe is redistributed to the oil return opening of each compressor under drive of the drive device, and therefore the oil level difference between the compressors can be balanced. The compressor assembly is high in balancing precision and high in balancing efficiency.

The invention relates to a carding roller bearing, which comprises an outer ring and a core shaft, wherein rolling bodies are mounted between the outer ring and the core shaft; holding racks are used for isolating the rolling bodies; scraper seals are mounted in dustproof grooves of the outer ring; a positioning ring is mounted on the outer circumferential surface of the outer ring; oiling structures are arranged at the two ends of the core shaft respectively; axial direction oil holes are formed in the two ends of the core shaft respectively; counter bores are positioned in the outer ends of the axial direction oil holes in an extending manner; oil plug heads are mounted in the counter bores; a core shaft gutter channel is arranged on the core shaft; outer circle grooves are formed in the outer circle of the core shaft and positioned at the two ends of the core shaft gutter channel; radial direction through-holes are formed along the positions of the outer circle grooves; the radial direction through-holes penetrate the axial direction oil holes. The carding roller bearing is compact and reasonable in structure. The oiling structures are arranged on the core shaft, so that lubrication in the process of use of the bearing can be realized conveniently, and the service life of the bearing is prolonged.

The invention belongs to the technical field of self-cooling fans, and particularly relates to a self-cooling fan which comprises a fan body, a mounting box and a rotating spindle, the mounting box is fixedly connected to one side of the fan body, and the fan body comprises a swing shell, a main shell, a sliding groove, an oil inlet, a rotating groove, an air vent, an oil outlet and a heat insulation plate. The rotating main shaft penetrates through the left wall of the fan body, a driving motor is arranged in the mounting box, and the driving motor is fixedly connected with the rotating main shaft; a rotating groove is formed in the fan body, rotating fan blades are arranged in the rotating groove, the rotating main shaft penetrates through the heat insulation plate on the left side and extends to the position between the two heat insulation plates, a speed reduction device and a moving device are arranged in the fan body, the speed reduction device is connected with the rotating main shaft, and the moving device is connected with the speed reduction device. By arranging the speed reducer and the moving device, the swing shell is driven to reciprocate, the working area is increased, and therefore the working efficiency of a user is improved.

The invention discloses a cleaning device for depositing mud in a residual water pool, which mainly includes a residual water tank, a sedimentation tank and a water purification tank. The residual water tank and the sedimentation tank are connected through a water inlet pipe, and the two pools pass through slide rails arranged on both sides of the pool A mud scraper is installed slidingly, and a mud discharge tank is provided on one side of the mud scraper direction in the two pools, and a control room is installed on the top of the pool wall of the side where the mud discharge tank is set for the residual water pool and the sedimentation tank And the control room is connected with the mud scraper, a stirring tank is arranged in the sedimentation tank, and agitators are installed side by side in the stirring tank; a water purifier is installed on the same side as the mud discharge tank inside the water purification tank, and another One side is equipped with multiple submersible sewage pumps, the water outlet of the water purifier is connected to one side of the circulation pipe, and the other side of the circulation pipe is connected to the sedimentation tank, and the sediment is cleaned in layers, with high cleaning efficiency .