43results about How to "Realize cycle purification" patented technology

The invention discloses a device for treating high-concentration ammonia-nitrogen wastewater in an aeration-anaerobic circulation mode. The device comprises an oxygenating column, a water inlet pump, a sludge reactor and a refluxing tank. An aerator is arranged at the bottom of the oxygenating column, a water distributing pipe is arranged at the bottom of the sludge reactor, oxygen-dissolved wastewater is pumped into the water distributing pipe through the water inlet pump, the refluxing tank is communicated with the oxygenating column, and gas generated by purifying the wastewater pushes the wastewater into the refluxing tank, the wastewater then flows into the oxygenating column to be oxygenated again, and circulating purifying is achieved. According to a wastewater treatment method, the oxygen dissolved in the denitriding process can only be supplied by oxygen dissolved in a water body, accurate supply control over electronic acceptors is achieved, it is guaranteed that ammonia nitrogen can only be converted into nitrite nitrogen, a proper environment is provided for smoothly carrying out the anaerobic ammonia oxidation process in the same reactor, the defect that an original anaerobic ammonia oxidation technology is quite prone to insufficient aeration or excessive aeration is overcome, the electronic acceptors are properly supplied in the denitriding process, and ammonia nitrogen in the wastewater is stably removed.

The invention provides a washing machine and a method for back-flushing a pre-filter of the washing machine. The washing machine comprises a circulating water filtering system, the circulating water filtering system comprises the pre-filter and a filtering film assembly arranged on a downstream pipeline of the pre-filter, the pre-filter and the filtering film assembly are configured in a way that during the circulating water filtering flow of the washing machine, and water discharged from a washing cylinder of the washing machine is filtered and then is recycled back to the washing cylinder. The filtering film assembly is further configured in a way that after the circulating water filtering flow and / or the filtering film assembly flushing flow, and residual water in the filtering film assembly is reversely discharged to the pre-filter in a controllable manner in order to carry out back-flushing to the pre-filter. According to the invention, after the circulating water filtering flow, residual water in the filtering film assembly carries out back-flushing to the pre-filter, the water source is reasonably utilized, and a filter screen in the pre-filter can be cleaned to a certain extent.

The invention provides a washing machine and a control method thereof. The washing machine comprises a washing cylinder, a filtration film assembly and a pumping device arranged on a pipeline between a water outlet of the washing cylinder and the filtration film assembly. The pumping device is configured in a way that during the filtering and water-producing stage of the filtration film assembly, the pumping device works in a first pumping manner and has first lift in order to pump water in the washing cylinder to the filtration film assembly, and the water level of water in the filtration film assembly is not higher than the lower edge of a discharge opening of the filtration film assembly. By means of different lifts of the pumping device, functions of the washing machine in different working stages are achieved, during the filtering and water-producing stage of the filtration film assembly, the low-lift water pump enables the water level of water in the filtration film assembly to be not higher than the lower edge of the discharge opening of the filtration film assembly, and therefore water from the washing cylinder can be discharged from the discharge opening of the filtration film assembly, and the fact that during the water filtration period, the total water amount of the washing cylinder basically keeps unchanged is guaranteed.

The invention relates to the technical field of air purification, in particular to a large-space disinfection device. The large-space disinfection device comprises an outer frame of the disinfection device. A fan is arranged in the center in the outer frame. The two sides of the fan are both provided with purification and disinfection modules. Each purification and disinfection module is composed of two sets of photocatalyst nets and an LED ultraviolet disinfection module arranged between the two sets of photocatalyst nets. An air inlet or an air outlet are formed in one side of the outer frame. An air outlet or an air inlet are formed in the other side of the outer frame. A filtering screen is arranged on the position of the air inlet or the air outlet. A power source controller and a control panel are arranged in the outer frame. The large-space disinfection device has the function of preventing the transmission diseases of an air system pipeline, the quality of working and living environment is improved, the purification and disinfection efficiency is high, the energy consumption is small, the wind resistance is small, and the large-space disinfection device has the great use and popularization value.

The invention discloses a water-circulating culture pond comprising a culture pond body with an inclined bottom. Closed arc flow-guiding plates are floatingly arranged in the culture pond. Water of the culture pond is divided into a closed circulating water channel by the arc flow-guiding plates. Walking waterwheels are arranged in the water channel. A sewage collecting area with sewage outfalls is arranged at the lowest position of the culture pond. In the water-circulating culture pond, water of the culture pond with the inclined pond base is divided into a closed circulating water channel by the arc flow-guiding plates, water in the water channel is delivered from one side to the other by the walking waterwheels in the water channel, water circulating is realized in the water channel; and sewage in the pond is collected in the sewage collecting area and discharged via the sewage outfalls by the aid of water circulating, so that effective circulating purification of water in the culture pond is realized, and purposes of culture pond cleaning and water quality conservation are achieved.

The invention discloses an operating room combined air cleaning system. The operating room combined air cleaning system comprises an air bellow unit, an air purification unit and a converter, the airbellow unit is connected with the air purification unit through an air intake pipe, the side, far away from the air bellow unit, of the air purification unit is provided with the converter, the inputend of the converter is connected with the air purification unit through a first air guide pipe, the output end of the converter is fixedly connected with a plurality of second air guide pipes, the ends, away from the converter, of the second air guide pipes are fixedly connected with air discharging assemblies, the air discharging assemblies are fixedly installed at the tops of operating rooms, apost-operation air disinfection mechanism is arranged at the top of each operating room, and an air circulation cleaning mechanism is arranged at the lower part of each operating room. According to the operating room combined air cleaning system, independent air cleaning of the multiple operating rooms of a hospital can be carried out, and clean air feeding and indoor air circulation purificationare achieved; and the post-operation air disinfection mechanisms are arranged, so that disinfection and sterilization in the operating rooms after the operation can be automatically achieved.

The invention discloses an operating room air purification device and a mounting method thereof. The device comprises a body, wherein the body is provided with an air outlet pipe and air suction pipes, the air outlet pipe is arranged at the top of an operating room, an air outlet penetrates through the top in the operating room, a front end of the air outlet pipe is connected with the air outlet,air suction openings are formed at bottoms of two sides in the operating room, front end of the air suction pipes are connected with the air suction openings, a tail end of the air outlet pipe and tail ends of the air suction pipes are tightly attached to a rear side wall outside the operating room, a circulating air inlet assembly communicates between the tail ends of the air suction pipes, and apurifying assembly is connected between the tail end of the air outlet pipe and the top of the circulating air inlet assembly. The method comprises steps of a, preparation before installation, b, mounting of the air outlet and an air suction port, c, mounting of the air outlet pipe, and d, mounting of the purifying assembly, the air suction pipes and the circulating air inlet assembly. The devicereduces or eliminates dust, microorganisms and bacteria in the air in the operating room, avoids influence on a patient in the operation process, and improves the success rate of an operation.

The invention discloses an ultra-thin type air circulation purifier which comprises an insulation box; two fixed shells are fixedly connected to the outer part of the insulation box through bolts; a metal mesh cylinder is coaxially arranged in each fixed shell; a filter layer is arranged between each fixed shell and the corresponding metal mesh cylinder; two first filter plates and two second filter plates are symmetrically clamped in each fixed shell; and each second filter plate is provided with a first one-way valve; the two ends of each fixed shell are each provided with a dustproof cover;the side wall of each fixed shell is connected with a flow dividing pipe through an exhaust pipe; and a second one-way valve is installed in each exhaust pipe. The purifier is ultra-thin, can be flatly placed between furniture and a floor, can also be hung in a slit between the furniture, can achieve circulating purification of air, increases air convection in all directions, and effectively removes harmful substances such as formaldehyde in a narrow space.

The invention provides a washing machine and a control method for the same. The washing machine comprises a filtering membrane assembly configured to filter water discharged out of a washing barrel of the washing machine, a water pump arranged on a water production pipeline of the filtering membrane assembly, and an air flow supplying apparatus configured to supply air flows to air-wash the filtering membrane assembly during filtration and water production of the filtering membrane assembly, wherein the water pump is configured to pump production water of the filtering membrane assembly to the water production pipeline, so the production water can be re-used for the washing barrel of the washing machine. Filtration water of the filtering membrane assembly can be specially cleaned, so service life of the filtering membrane assembly of the washing machine can be further prolonged and high production water flow can be guaranteed.

The invention discloses a swimming pool drainage self-purification system. According to the technical scheme, the swimming pool drainage self-purification system is characterized in that the swimming pool drainage self-purification system comprises a water inlet and a water outlet, the water inlet and the water outlet are each provided with an opening device, the opening devices are fixedly connected with the water inlet and the water outlet, water quality detectors are arranged on the opening devices, and the water quality detectors are fixedly connected with the opening devices; when the water quality detector detects that the water quality of the swimming pool is poor, the opening device is started to drain water, a water inlet pipeline is arranged below the water inlet, a water outlet pipeline is arranged below the water outlet, a pumping and draining pump is arranged in the water outlet pipeline, and the pumping and draining pump is fixedly connected with the water outlet pipeline. A filtering device is arranged between the water inlet pipeline and the water outlet pipeline, one end of the filtering device is connected with a pipeline opening of the water inlet pipeline, and the other end of the filtering device is connected with a pipeline opening of the water outlet pipeline. The system can solve problems that manual operation drainage is needed, swimming pool water change frequency is high, bacteria are easily bred without changing, and the like.

The invention discloses a cyclone backflow type waste gas purifier system. The system comprises a cyclone pipeline and a cyclone separator which are horizontally and coaxially arranged and overcomes the problem that dust in an existing cyclone dust collector is brought up by vortex rotation, thereby solving the problem that dust collection efficiency is low. According to the invention, a spiral blade and a cyclone separator are arranged in a cyclone pipeline, and a dusty gas outlet of the cyclone separator communicates with an inertia separation type waste gas purifier, so dusty gas can be purified in a multi-level hierarchical manner, dust with different particle sizes in the dusty gas can be separated in a targeted manner, and dust removal effect is good; an emulsifier atomization device can be used for purifying oily substances in the dusty gas, so the applicability of the device is wide; the system is simple in structure, only a fan is needed to provide a power source to complete the purification process of dusty gas, and meanwhile, devices in the system are easy to mount and dismount; and the system is simple in structure, good in dust removal effect, high in efficiency and extremely high in universality and adaptability.

The invention relates to a multifunctional indoor air purification device and a window and room with the same. The air purification device comprises a circulation part, a purification part and a controller, wherein the circulation part is arranged on an indoor wall body or the window and used for circulating flow of indoor air or exchange of the indoor air and outdoor air, the purification part is connected with the circulation part and used for purifying the air circularly flowing in the circulation part, and the controller is used for controlling starting and stopping of the circulation part and the purification part. According to the multifunctional indoor air purification device and the window and room with the same, due to the fact that the circulation part and the purification part are arranged on the indoor wall body or the window, circulation purification treatment can be conducted on the indoor air.

The invention relates to an indoor air small-area circulating purification device which comprises a spherical purification shell. The inner portion of the spherical purification shell is divided into four cavities through two separating boards and the four cavities are the cavity A, the cavity B, the cavity C and the cavity D. The cavity A and the cavity C are arranged on the lower portion of the purification shell and liquid water is respectively injected in the cavity A and the cavity C. The cavity B and the cavity D are arranged on the upper portion of the purification shell and purification liquid is respectively injected in the cavity B and the cavity D. The upper end of the cavity A and the upper end of the cavity C are communicated with the cavity B and the cavity D through U-type pipes respectively. The cavity B and the cavity C are communicated through a V-type pipe. Filter layers are arranged at the upper end of the cavity D. An air outlet is formed in the upper portions of the filter layers. An air inlet is formed in the lower end of the cavity A and communicated with one end of an air inlet pipeline, the section of the other end of the air inlet pipeline is trapezoidal, a mini-type fan and an ultraviolet lamp are arranged in the air inlet pipeline, and the ultraviolet lamp is arranged at the rear end of the fan. The filter layers are composed of the carbon monoxide filter layer, the nicotine filter layer, the organic pollutant filter layer and the ozone filter layer sequentially. According to the indoor air small-area circulating purification device, circulating purification can be conducted, the purification effect is good, and the occupied area is small.

The invention discloses a heavy-load clean goods elevator which comprises an elevator car (1), a separation part (2) is arranged in the elevator car (1), a carrying part (3) is formed on one side of the separation part (2), an air passing channel (4) is formed in the other side of the separation part (2), an air inlet (5) communicated with the carrying part (3) is formed in the lower end of the air passing channel (4), and the top of the air passing channel (4) extends to the outer side of the elevator car (1) and is provided with an air outlet (6). The outer portion of the air outlet (6) is connected with a purifier (8) located on the top of the elevator car (1) through an air pipe (7), and the air outlet end of the purifier (8) is communicated with the carrying part (3). Air in the lift car can be circularly purified, mutual exchange of air inside and outside the lift car is reduced, and the lift car air purification device has the advantages of being low in power consumption, good in purification effect and low in noise.

The invention discloses biological membrane denitrification sewage treatment equipment based on centrifugal effect, and relates to sewage treatment equipment. The biological membrane denitrification sewage treatment equipment comprises an outer box body, the inner side of the outer box body is fixedly connected with a horizontal fixing rod, the inner end of the horizontal fixing rod is connected with an inner box body through a connecting block, and the upper part of the inner side of the outer box body is fixedly connected with a mounting bracket; and a motor is fixedly connected above the mounting bracket, a motor rotor is fixedly connected with a longitudinal rotating shaft, and the lower end of the longitudinal rotating shaft penetrates through the inner box body and is connected with a centrifugal treatment assembly. The motor rotates to discharge sewage in the inner box body to the MBR membrane assembly under the centrifugal effect, the sewage is filtered and purified while flowing through an MBR membrane assembly under the centrifugal force effect, meanwhile, sludge on the MBR membrane assembly is washed away under the impact force effect, and the filtering effect of the MBR membrane assembly is improved; and in addition, the device can achieve circulating purification, and sewage which does not pass through the MBR membrane assembly flows back into the inner box body or the outer box body to be purified again, so that the use experience is good.

The invention discloses a pulse corona plasma based air purification ventilating window. The air purification ventilating window comprises a size-adjustable window-shaped housing and a power source module connected thereto; the window-shaped housing can be divided into a lower air inlet chamber, an intermediate plasma processing chamber, and an upper fan; a physical filtering screen is arranged between the air inlet chamber and the plasma processing chamber; and an ozone filtering screen is disposed between the plasma processing chamber and the fan. The air inlet chamber comprises an inner airinlet and an outer air inlet, wherein a push plate is arranged in the inner air inlet; in the plasma processing chamber, corrosion-resistant metal wires and corrosion-resistant metal plates are longitudinally and alternatively arranged on a plane of the plasma processing cavity to form a discharge electrode; the metal wires are mutually connected in parallel to form a cathode, and the metal plates are mutually connected in parallel to form an anode. The invention can realize indoor air circulation purification of the conventional air purifiers, can realize the renewal of the indoor air. The invention adopts a pulse corona discharge structure, which can generate low temperature plasma to treat contaminated organic matters and can achieve electrostatic dust removal.

The invention discloses a train whole-vehicle shot blasting derusting machine, and belongs to the technical field of train derusting. The system comprises a shot blasting cleaning chamber, a tractiondevice, shot blasting devices and a shot circulating purification system. The shot blasting cleaning chamber is in a hollow shell shape, and a collecting cavity is formed in the bottom surface of theshot blasting cleaning chamber. The traction device spans the collecting cavity, and the traction device penetrates through the shot blasting cleaning chamber. The multiple shot blasting devices are arranged in the shot blasting cleaning chamber, and the shot blasting devices spray shots to a middle cavity of the shot blasting cleaning chamber. The suction end of the shot circulating purificationsystem is located at the lower portion of the collecting cavity. A shot outlet of the shot circulating purification system is connected with the shot blasting devices. The train whole-vehicle shot blasting derusting machine solves the technical problems that when the train whole vehicle surface is cleaned and derusted, the work intensity is large, the efficiency is low, the surface smoothness of the train whole vehicle cannot be guaranteed by using manual operation, and the sprayed shot is not easy to recycle.

The invention provides a catalytic combustion all-in-one machine. The problems that in the prior art, a catalytic combustion device is complex in structure and high in cost are solved. The catalytic combustion all-in-one machine comprises a machine body shell, wherein a machine body heat exchange chamber, an electric heating chamber and a catalytic combustion chamber are arranged in the machine body shell, and a waste gas inlet and a gas outlet are further connected to the machine body shell; and waste gas entering from the waste gas inlet sequentially passes through the machine body heat exchange chamber, the electric heating chamber and the catalytic combustion chamber, the waste gas at the body heat exchange chamber and the electric heating chamber absorbs heat to achieve preheating, the waste gas at the catalytic combustion chamber is subjected to chemical reaction to generate high-temperature gas, the high-temperature gas passes through the machine body heat exchange chamber and is discharged out of the machine body shell from the gas outlet, and the high-temperature gas in the machine body heat exchange chamber is isolated from the waste gas and exchanges the heat.

The invention discloses a green and environment-friendly outdoor dust suppression device utilizing solar heat energy, which comprises a dust filter part, a rotating bracket and a double-layer semi-conical shell; the rotating bracket includes a base and a support shaft arranged on the base, and a shaft sleeve is arranged outside the support shaft , the outer wall of the shaft sleeve is provided with a tray, the dust filter part is arranged on the tray, and the base is arranged on the bottom plate; the double-layer semi-conical shell includes an inner shell and an outer shell, the lower end of the outer shell is connected to the bottom plate, and the upper end of the inner shell is connected to the bottom plate. The upper end of the supporting shaft is connected; the gap between the inner shell and the outer shell forms an air passage, and a dust filter water storage tank is also arranged in the air passage; a solar heat absorption layer is arranged on the outer surface of the outer shell; a sewage discharge port is arranged on the bottom plate. The equipment of the present invention has good adaptability and serviceability, and benefits from one deployment for a long time. There are no dust-reducing consumables such as filters, and no need for regular replacement operations, realizing zero-consumable maintenance-free large-scale air filtration.

An indoor air circulating, purifying and humidifying device mainly comprises a machine box case with a panel arranged in the front, the panel is at least provided with a purified air outlet, and a main function module in the middle of the machine box case and a power device are installed in the machine box case at least. The main function module comprises a fan module and a purification module. The purification module is communicated with an indoor circulation air inlet in the panel and the fan module. The fan module utilizes an air feed channel with a fan so as to be communicated with the purified air outlet in the panel through air outlets in air channel plugs arranged on the two sides of the air feed channel and an air outlet tank in the machine box case. A water storage tank of an overall closed structure is installed below the opening corresponding to the air outlet tank. A humidifier and a humidifier connection plate with an air outlet are installed on one side of two sides of the water storage tank, and the air outlet of the humidifier is communicated with the purified air outlet in the panel. The indoor air circulating, purifying and humidifying device has the advantages of being reasonable in structural composition, convenient to use and install, capable of purifying and humidifying air in a circulating mode and capable of effectively preventing hazardous substances in the air from polluting indoor living space.

The invention discloses a small kitchen waste fermentation machine sewage treatment system, which comprises a liquid storage barrel provided with a liquid inlet and a liquid outlet, wherein a partition plate dividing the inner cavity of the liquid storage barrel into a first cavity and a second cavity is arranged in the liquid storage barrel, a plurality of through holes are formed in the partition plate, a filter membrane assembly is arranged on the side, located on the first cavity, of the partition plate, the liquid outlet is connected with a jet pump through a circulating liquid pipeline, the other end of the circulating liquid pipeline is communicated with the liquid storage barrel, an ozone generator is arranged on one side of the liquid storage barrel, the air outlet end of the ozone generator is communicated with the circulating liquid pipeline through an air inlet pipeline and an ejector, and the system further comprises an automatic control system. The small kitchen waste fermentation machine sewage treatment system is reasonable in structural design, convenient to control and low in treatment cost, can form a sewage treatment circulation loop, achieves automatic circulation purification of sewage, improves the purification efficiency, can effectively improve the quality of the sewage of the fermentation machine, and makes the sewage of the fermentation machine reach the recycling standard.

The invention discloses a total heat exchanger, a control method and an air conditioner, and relates to the technical field of air conditioning. The invention aims to solve the problem that indoor air quality is affected when outdoor air is led indoors through the total heat exchanger in hazy weather in the prior art. The total heat exchanger disclosed by the invention comprises a shell on which an indoor air inlet, a fresh air outlet, an indoor air outlet and a fresh air inlet are arranged, and the shell is internally provided with a first air duct communicating with the indoor air inlet and the indoor air outlet, and a second air duct communicating with the fresh air inlet and the fresh air outlet; the shell is also internally provided with a third air duct communicating the first air duct and the second air duct, and a filter device is arranged in the first air duct, the second air duct or the third air duct; the third air duct is internally provided with an air door component; when the air door component is opened, the first air duct communicates with the second air duct through the third air duct; when the air door component is closed, the first air duct is disconnected from the second air duct through the third air duct. In the total heat exchanger disclosed by the invention, indoor air cold or heat can be recycled.

The invention relates to the technical field of equipment for watching fish cultivation, in particular to a water-painting collection ceramic watching fish tank. The fish tank comprises a fish tank body, wherein the fish tank body comprises an upper-layer component and a lower-layer component; the upper-layer component is a ceramic tank body and comprises a bottom wall; a drain hole is formed in the bottom wall; the lower-layer component comprises a base housing, a filter component, a water pump and a pipeline system; the filter component is mounted in the base housing; the water pump is arranged in the base housing and is communicated with the upper-layer component through the pipeline system; the water pump, the filter component, the upper-layer component and the pipeline system form a circulating water way. The water-painting collection ceramic watching fish tank provided by the invention has the advantages that the fish tank body is divided into two parts, so that not only is the cleanliness of the water body in the upper-layer component improved, but also the water body can flow, the contact area of the water body and air is increased, and the oxygen content of the water body is increased.

The invention discloses an environment-friendly outdoor dust fall device utilizing solar thermal power. The device comprises a dust filtration part, a rotary bracket and a double-layer half-cone shell, wherein the rotary bracket comprises a base and a support shaft arranged on the base, a shaft sleeve is arranged outside the support shaft, a tray is arranged on the outer wall of the shaft sleeve,the dust filtration part is arranged on the tray, and the base is arranged on a base plate; the double-layer half-cone shell comprises an inner shell and an outer shell, the lower end of the outer shell is connected with the base plate, and the upper end of the inner shell is connected with the upper end of the support shaft; an air channel is formed in a gap between an inner shell and an outer shell, and a dust filtration and water storage slot is formed in the air channel; a solar thermal power absorbing layer is arranged on the outer surface of the outer shell; and a sewage discharging holeis formed in the base plate. The environment-friendly outdoor dust fall device is good in universality and service and has a long-term beneficial effect after being set once. Dust fall consumables such as a filter net are saved, and the regular exchange operation is saved, and the large-scale zero-consumable and maintenance-free air filtration operation is realized.

The invention relates to the technical field of equipment for watching fish cultivation, in particular to a water-painting collection ceramic watching fish tank. The fish tank comprises a fish tank body, wherein the fish tank body comprises an upper-layer component and a lower-layer component; the upper-layer component is a ceramic tank body and comprises a bottom wall; a drain hole is formed in the bottom wall; the lower-layer component comprises a base housing, a filter component, a water pump and a pipeline system; the filter component is mounted in the base housing; the water pump is arranged in the base housing and is communicated with the upper-layer component through the pipeline system; the water pump, the filter component, the upper-layer component and the pipeline system form a circulating water way. The water-painting collection ceramic watching fish tank provided by the invention has the advantages that the fish tank body is divided into two parts, so that not only is the cleanliness of the water body in the upper-layer component improved, but also the water body can flow, the contact area of the water body and air is increased, and the oxygen content of the water body is increased.

The invention discloses a wall-mounted new air purifying machine which comprises a purifying machine shell. An inner circulation air inlet, a new air inlet and an air outlet are formed in the purifying machine shell; and an inner partition plate, an outer partition plate and an air purifying assembly are arranged in the purifying machine shell. The inner partition plate, the outer partition plate and the air purifying assembly are matched to form an air flowing area in the purifying machine shell together in an enclosing mode, and air entering the purifying machine shell through the inner circulation air inlet and the new air inlet flows through the air flowing area, then is purified and filtered through the air purifying assembly, and finally is discharged through the air outlet. According to the wall-mounted new air purifying machine, an air purifying system and a filter screen are combined to be used so that outdoor new air can be guided in and purified, indoor air can be effectively circulated and purified, and the indoor air quality is obviously improved.

The invention discloses a recyclable purification type electronic cigarette, and relates to the technical field of electronic cigarettes, in particular to a cigarette case and a cigarette storage assembly, a lithium battery is arranged on the right side in the cigarette case, the cigarette storage assembly is connected to the top of an atomizer, and a cigarette holder assembly is connected to the top of a three-way pipe. The cigarette holder assembly comprises a spring telescopic pipe, a gas flap rubber nozzle and a cigarette holder body, and the gas flap rubber nozzle is arranged at the bottom of the inner wall of the spring telescopic pipe. According to the electronic cigarette capable of being circularly purified, smoke can circularly flow before being smoked, and the smoke is circularly purified in the flowing process to eliminate nicotine substances in the smoke as much as possible, so that the intake of nicotine can be greatly reduced when a human body smokes the smoke, and the damage of the nicotine to the human body is reduced; in addition, low-temperature heating is carried out in the circulating flowing process of the smoke in the closed environment to achieve the heat preservation effect, so that the smoke still has a certain temperature when being smoked, and the better experience feeling close to smoking is provided for the human body.

The invention provides a washing machine and a method for back-flushing a pre-filter of the washing machine. The washing machine comprises a circulating water filtering system, the circulating water filtering system comprises the pre-filter and a filtering film assembly arranged on a downstream pipeline of the pre-filter, the pre-filter and the filtering film assembly are configured in a way that during the circulating water filtering flow of the washing machine, and water discharged from a washing cylinder of the washing machine is filtered and then is recycled back to the washing cylinder. The filtering film assembly is further configured in a way that after the circulating water filtering flow and / or the filtering film assembly flushing flow, and residual water in the filtering film assembly is reversely discharged to the pre-filter in a controllable manner in order to carry out back-flushing to the pre-filter. According to the invention, after the circulating water filtering flow, residual water in the filtering film assembly carries out back-flushing to the pre-filter, the water source is reasonably utilized, and a filter screen in the pre-filter can be cleaned to a certain extent.