96results about How to "Good self-cleaning effect" patented technology

The invention relates to a preparation method of super-hydrophobic-hydrophilic wood with intelligent temperature response and belongs to the field of super-hydrophobic wood. The super-hydrophobic wood prepared by the method has the hydrophilic reversible characteristic which is not owned by the previous super-hydrophilic wood. A contact angle between the super-hydrophobic wood and water is greater than 150 degrees; a rolling angle is smaller than 10 degrees; the super-hydrophobic-hydrophilic wood is excellent in super-hydrophobic performance and good in self-cleaning performance. The preparation method of the super-hydrophobic-hydrophilic wood with the intelligent temperature response comprises the following steps: soaking the wood in a silicon dioxide aqueous solution, drying, then uniformly and dropwise coating the surface of the wood with polycaprolactone dissolved in a mixed solution of methyl alcohol and chloroform, and finally drying in vacuum. The wood shows the intelligent temperature response in the cross section. The method is simple in process, low in cost, short in period, low in energy consumption and free of special complicated equipment; the prepared super-hydrophobic-hydrophilic wood with the intelligent temperature response is capable of converting the wettability for hundreds of times under high and low temperatures; the prepared super-hydrophobic-hydrophilic wood has a great application prospect in the future.

The invention discloses a preparation method of super-hydrophobic self-cleaning glass based on a ZnO nano array coating. The preparation method comprises the following steps: preparing ZnO seed layer sol by a sol-gel method; plating ITO glass with a ZnO seed layer by a dipping-pulling method; performing heat treatment and paving a layer of polystyrene spheres; performing hydrothermal treatment on the prepared ZnO seed layer/PS material in a ZnO growth solution to obtain a ZnO/PS nano rod array; and treating the ZnO/PS nano rod array with toluene for a period of time to obtain the super-hydrophobic self-cleaning glass. According to the super-hydrophobic self-cleaning glass based on a ZnO nano array coating prepared by the method disclosed by the invention, the transmittance of visible light can reach 96.3%, and both of the ultraviolet absorption efficiency and shielding efficiency can reach 90%; and according to the test by a contact angle meter (DSA series), the contact angle to water exceeds 152 degrees. The preparation method disclosed by the invention has the advantages of no secondary harm, low cost, easiness in implementation and convenience in control.

The invention discloses a community intelligent security and protection monitoring device based on Internet of Things, which comprises a base, wherein a storage battery is arranged inside the base; astand column is arranged in the middle of the upper surface of the base; a second connection rod is arranged at the top end of the stand column; a camera is arranged at one end of the second connection rod far away from the stand column; a first connection rod is arranged on one side of the second connection rod; an illuminating lamp is arranged at the bottom end of the first connection rod; a solar panel is arranged above the stand column; a cleaning mechanism is arranged above the first connection rod. A cleaning mechanism is arranged on the community intelligent security and protection monitoring device; a user can wash the dust accumulated on the self-cleaning brush and the camera through the cleaning mechanism, thereby removing dust from the self-cleaning brush and the camera, so thatthe community intelligent security and protection monitoring device has better self-cleaning effect; secondly, a water storage funnel in the cleaning mechanism can protect the illuminating lamp and prevent the illuminating lamp from being eroded by rain water.

The invention discloses a self-cleaning nitrogen-doped titanium oxide film as well as a preparation method and applications thereof. The preparation method comprises steps as follows: butyl titanate, absolute ethyl alcohol and acetylacetone are evenly mixed, and a solution A is obtained; deionized water, hydrochloric acid, absolute ethyl alcohol and polyvinylpyrrolidone are evenly mixed, and a solution B is obtained; the solution A is added to the solution B dropwise, stirring is performed, and sol C is obtained through ageing or without ageing; a to-be-coated substrate which is washed clean is soaked in the sol C and lifted vertically at the constant speed for coating, then drying and calcination are performed, and the self-cleaning nitrogen-doped titanium oxide film with the thickness ranging from 0.2 mu m to 10 mu m is obtained. According to the method, technological equipment is simple, the cost is low, the film-forming property and the repeatability are good, the prepared film has the good hydrophilia, and the hydrophilia and the methylene blue degradation efficiency of the film are obviously higher than those of a common titanium oxide film under visible light irradiation.

The invention discloses a method for preparing a transparent organic hydrophobic coating on the surface of an aluminum plate. The method comprises the following steps of: preparing hydrolysis solution; processing the aluminum plate with the hydrolysis solution and drying the aluminum plate; coating a silicone glass resin on the aluminum plate; and heating the aluminum plate. The organic coating prepared by the invention can effectively resist the corrosion of acid solution with pH of 3.5; the surface of the coating after being corroded for 168 hours still is not obviously changed; the coating has high adhesive force to the aluminum plate, so the coating does not crack or shed when folded; the test of a WS-2002 coating adhesive force automatic scratch tester shows that the adhesive force between the coating and the matrix of the aluminum plate reaches 40N; the coating does not shed after being circulated for 50 times in hot water of 95 DEG C and cold water of 20 DEG C; the contact angle between pure water and the surface of the coating is close to 120 degrees; and the coating has high hydrophobicity, obvious self-cleaning effect and light transmittance of 96 percent.

The invention relates to the technical field of coatings, in particular to a high temperature-resistant fireproof coating and a preparation method thereof. The high temperature-resistant fireproof coating is prepared from the following raw materials in parts by weight: acrylic resin, inorganic filler, a thickener, a flame-retardant agent, a ceramic additive, fireproof short fibers, a crosslinkingagent, a coupling agent, a flatting agent, a defoaming agent, a wetting agent, a film forming additive, other additives and solvents. The high temperature-resistant fireproof coating has the advantages that high temperature can be endured, the flame-retardant property is good, the propagation of fire condition is well blocked, and the fireproof property is excellent; the effect of resisting long-time impact by 1100 DEG C hydrocarbon high-temperature fire hazard is realized; the weather-resistant property and waterproof property are realized, the shrinkage is avoided, the coating strength is high, and the surface is flat.

The invention provides a self-cleaning control method for an air conditioner and a heat exchanger of an indoor unit thereof. The method comprises the following steps: controlling the air conditioner to refrigerate, so that the temperature of the surface of the heat exchanger is lowered and the surface is frosted; continuously detecting the temperature of the surface of the heat exchanger of the indoor unit during the time period of the refrigeration of the air conditioner; adjusting a refrigeration duration time of the indoor unit according to the detected temperature of the heat exchanger; controlling the air conditioner to heat after the refrigeration is concluded, so that the temperature of the surface of the heat exchanger rises, the surface is frosted, and the frost is melted into water to clean the heat exchanger; continuously detecting the temperature of the surface of the heat exchanger of the indoor unit during the time period of the heating of the air conditioner; and adjusting a heating duration time of the air conditioner according to the detected temperature of the heat exchanger. According to the method provided by the invention, the refrigeration time and the heating time are adjusted according to the temperature of the surface of the heat exchanger of the indoor unit, so that the frosting quantity of the surface of the heat exchanger is moderate, and the optimal self-cleaning effect is achieved in the shortest time.

A preparing method of a sandwich-structured composite material is provided. The composite material includes a first layer, a middle layer and a second layer which are laminated in order. The first layer and the second layer are fiber-reinforced plastic layers. The middle layer is a foam core material layer. The method includes mixing resin and a curing agent to prepare matrix resin; infiltrating aglass fiber fabric and/or glass fiber felt with the matrix resin to obtain fiber-reinforced plastic preform layers; putting the fiber-reinforced plastic preform layers at two sides of the middle layer; performing lamination and solidification to obtain the composite material in which the foam core material layer is sandwiched with the fiber-reinforced plastic layers. The composite material maintains high rigidity and aging resistance characteristics of fiber-reinforced plastic, also utilizes high shearing strength, good toughness and buffer and heat insulation functions of structured foam, can enhance bonding firmness of the layers, can enhance mechanical properties, and can ensure smoothness of external surfaces of the fiber-reinforced plastic layers so as to obtain a good self-cleaningeffect.

The invention discloses deep-color super-hydrophobic infrared-reflection thermal insulation coating. The deep-color super-hydrophobic infrared-reflection thermal insulation coating is characterized inthat a method of the deep-color super-hydrophobic infrared-reflection thermal insulation coating comprises the following steps: uniformly mixing a water solution of ethanol, nano silicon dioxide particles, hybridized siloxane and fluorine-containing siloxane; regulating the pH (Potential of Hydrogen) value to 3 to 5 by utilizing dilute hydrochloric acid and stirring and reacting for 1 to 5h; adding waterborne epoxy resin and a waterborne curing agent into a reaction solution; after uniformly stirring, adding an infrared-reflection pigment and uniformly mixing to obtain the deep-color super-hydrophobic infrared-reflection thermal insulation coating. A deep-color super-hydrophobic infrared-reflection thermal insulation coating layer prepared by the method has high infrared reflectivity on solar radiation; the surface temperature of the coating layer can be greatly reduced; when the deep-color super-hydrophobic infrared-reflection thermal insulation coating is used on an outer wall or aroof, the indoor temperature can be effectively reduced, so that the building energy saving effect is realized. Meanwhile, the surface is super-hydrophobic so that the thermal insulation coating layerhas a good rainwater self-cleaning effect, and the service life and the appearance beauty of the coating layer are greatly improved; the coating is aqueous and is very environmentally friendly to construction and environment.

The invention relates to a laminated self-adaptive drip irrigation emitter and a use method thereof; the laminated self-adaptive drip irrigation emitter is characterized by comprising a emitter shell body; both ends of the emitter shell body are respectively provided with a butting joint; two groups of arc tooth-shaped energy dissipation runners are arranged on the outer wall of the emitter shell body; a structure area and a buffer area are arranged between the two groups of arc tooth-shaped energy dissipation runners; positions on the two groups of arc tooth-shaped energy dissipation runners which are close to the structure area are provided with wall surface water inlets which are communicated with the inside of the emitter shell body, and the positions of the two groups of arc tooth-shaped energy dissipation runners which are close to the buffer area are provided with outlets which are communicated with the buffer area; both ends of the outer wall of the emitter shell body are respectively provided with a circle of water collection runner which is communicated with the buffer area; a capillary is wrapped outside the emitter shell body, and water outlets are arranged on one or two ends of the water collection runner on the capillary; positions in the emitter shell body which are close to butting joints on both ends are respectively provided with a water inlet and outlet laminate; two energy dissipation laminates are arranged between the two water inlet and outlet laminates; an elastic diaphragm is arranged between the two energy dissipation laminates; and the wall surface water inlets are arranged between the two energy dissipation laminates.

The invention discloses a novel nanometer self-cleaning fluorocarbon coating for an exterior wall. The novel nanometer self-cleaning fluorocarbon paint comprises the following components: 220 to 280 parts of deionized water, 8 to 10 parts of dispersing agent 731A, 6 to 8 parts of wetting agent X-405, 3 to 4 parts of neutralizing agent AMP-95, 3 to 4 parts of preservative LEX, 500 parts of water-based fluorous emulsion, 160 to 200 parts of titanium dioxide R706, 20 to 25 parts of ethanol, 30 to 40 parts of nanometer TiO2, 20 to 30 parts of nanometer ZnO, 20 to 25 parts of hydroxyethyl cellulose, 25 to 40 parts of propylene glycol, 6 to 8 parts of antifoaming agent NXZ, 1 part of acrylic associative thickener TT935, and 2 to 4 parts of flatting agent RM-2020. After the nanometer material with photocatalytic function is added to the coating, the surface of the coating is hydrophilic under the ultraviolet irradiation, and the micronization is brought at the same time, therefore hydrophilic and oleophilic substances attached to the film surface can be effectively cleaned and degraded, and as a result, good self-cleaning effect can be achieved.

The present invention relates to a bulk flow and self-cleaning net type filter comprising a tank body, a power system, a control system and a filter chamber. The bottom of the tank body is provided with a water inlet, one side of the tank body is provided with a water outlet, and the top of the tank body is provided with a sewage draining exit and a power system, and a filter chamber connected with the power system, the control system and the water outlet respectively is arranged inside the tank body. The filter is characterized in that the filter chamber comprises a cuneate filter canister and a rotating stainless steel wire brush unit arranged in the cuneate filter canister; the cuneate filter canister is connected with the water inlet; the rotating stainless steel wire brush unit comprises central upper, middle and lower wire brush shafts that are connected to each other, and three sets of steel wire brushes that are arranged at the central brush shafts vertically; the upper and lower shafts of the wire brush are connected with the top and the bottom of the filter chamber respectively; every two steel wire brushes are at a 120 DEG angle to each other. The filter is advantageous in simple structure, sensitive self-cleaning control system and excellent sewage draining effect.

The utility model relates to a pipe-type full-spectrum water quality detection device, and the device comprises a spectrograph for full-spectrum acquisition, and further comprises an optical fiber-based reflective probe arranged on a pipe, a xenon lamp light source which is used for providing ultraviolet light and visible light, a cooperative work module which is used for synchronizing the light source, the spectrograph and a waterway, a controllable waterway pipe which is used for waterway control and cleaning, a constant-temperature box which is used for placing the spectrograph and the xenon lamp light source, and a data processing and display module which is used for spectral data processing and water quality index display. The invention further provides a pipe-type full-spectrum waterquality detection method. Various water quality parameters can be measured at the same time; the pipe-type installation based on an industrial field facilitates the maintenance, is strong in self-cleaning capacity, enables the probe not to be prone to pollution, and enables the spectrograph, the light source and other electronic equipment to be placed in a constant-temperature box to achieve reliable operation at the temperature of-20 DEG C to 60 DEG C; a PCA dimension reduction and BP neural network learning method is used to realize rapid and reliable measurement of a plurality of mixed substances in full spectrum data.

The invention discloses a laser preparation method of self-cleaning antibacterial glass. Firstly, a prepared chemical solution is scoured to the surface of a metal substrate, and meanwhile, the bottomsurface of glass covers the metal substrate; thirdly, ultrafast laser penetrates through the glass to irradiate the metal substrate, the glass at the interface is molten, the microstructure on the metal is transferred to the glass, meanwhile, the nanoparticles in the solution are reduced and adsorbed to the glass microstructure, and then the glass is subjected to annealing treatment, so that a dual-size micro-nano structure covering the non-polar nanoparticles is generated on the surface of the glass. The surface has an excellent self-cleaning super-hydrophobic function, greasy dirt and the like on the surface of the glass can be removed by using a small amount of water and labor, almost no water stain is left, and the cleaning difficulty in the using process is reduced. Moreover, the super-hydrophobic property can resist bacterial adhesion, and the nanoparticles can kill the adhered bacteria, so that the surface of the glass has excellent antibacterial/bactericidal functions. The preparation method is simple, has universality and is suitable for glass made of various materials. The prepared glass has the advantages of unchanged mechanical properties and favorable light permeability, and is suitable for large-scale commercial production.

The invention provides a self-cleaning high-corrosion-resistance plating layer steel plate and a preparation method thereof, belonging to the technical field of a coating layer steel plate. The steel plate comprises a base plate, a first structure layer in combination with the surface of one outward side of the base plate when in use and a second structure layer in combination with the surface of one inward side of the base plate when in use. The steel plate is characterized in that the surface of the first structure layer is combined with a passivation layer, and the surface of the passivation layer is combined with a self-cleaning layer. The preparation method comprises the following steps of: selecting and cleaning a cold-roll steel plate, and drying after cleaning to obtain the base plate; coating a structure layer material on the surface of one side of the base plate to from a first structure layer, and coating the structure layer material on the surface of the other side of the base plate to from a second structure layer; passivating the surface of the first structure layer by a passivant, and drying after passivating; and coating the self-cleaning sol onto the surface of the passivation layer, and calcining and curing. The steel plate disclosed by the invention has the advantages of good corrosion resistance effect, ideal self-cleaning effect and succinct processing steps, and is capable of guaranteeing the self-cleaning and corrosion-resistant effects.

The invention belongs to the technical field of preparation of paint, and discloses titanium sol-containing organosiloxane hybrid emulsion and modified silicate paint. The paint is prepared from the following components in parts by weight: 100 parts of an inorganic silicate solution, 2-40 parts of the titanium sol-containing long-chain organosiloxane hybrid emulsion, 5-40 parts of silicon sol, 10-80 parts of water, 0.5-4 parts of a defoaming agent, 0.5-4 parts of a dispersing agent, 0.5-4 parts of a wetting agent, 5-30 parts of pigment and 10-65 parts of filler. The modified silicate paint provided by the invention can be painted by using processed such as roll painting, spray painting and brush painting, has a surface contact angle of 105-145 degrees, and has good water resistance and acid and alkali resistance; the alkali resistance of the paint can be maintained to be normal for 48h, and the paint is washable (can be washed for 1200 times without exposing base coat); the problems such as cracking, falling off and powder falling can be effectively prevented during use; the paint has a potential of being widely used in the field of high hydrophobic, high anti-fouling and self-cleaning interior and exterior wall coatings.

The invention discloses a lithium silicate interior and exterior wall coating and a preparation method thereof. The lithium silicate interior and exterior wall coating is prepared from the following raw materials: water, hydroxyethyl cellulose, a dispersing agent, a wetting agent, a defoaming agent, attapulgite, diatomite, calcined kaolin, ground calcium carbonate, titanium dioxide, a humectant, an acrylic emulsion, modified lithium silicate resin, a thickening agent and a coalescing agent. And the modified lithium silicate resin is modified lithium silicate resin subjected to silane coupling and hydrolysis, and has the characteristics of high strength, high strength and self-drying film formation, so that the floating phenomenon caused by saltpetering on the wall surface due to the coating is fundamentally avoided. The lithium silicate-based inorganic coating produced by taking the emulsion as a base material comprehensively reaches various performance indexes of the inorganic coating, the attractive effect of a wall surface is remarkably improved, and the weather resistance and the stability of the coating can also be improved. The preparation method of the coating is simple in step, mild in reaction condition and suitable for large-scale production and preparation.

The invention relates to the technical field of desulfurization and particularly discloses a method for separating desulfurization waste water by using an electric drive membrane. The method comprises the following steps of (A) front-end pretreatment; (B) separation and concentration by the electric drive membrane; and (C) multiple-effect evaporation crystallization. The water production rate of the method can reach over 95%, if water quality of a system fluctuates, when the SO4<2-> content is relatively high, excessive scaling of an assembler can be avoided by only adopting a rearrangeable electrode, that is to say, the system has a good self-cleaning effect on inorganic salt scaling. Compared with a double-membrane method, the residual chlorine resistance of the electric drive membrane is greatly enhanced, so that a small amount of fungicide can be added and the system is prevented from being polluted by bacteria; and meanwhile, the electric drive membrane runs through the propelling force from DC, so that the method also has a sterilization effect on microorganisms.

The invention discloses an evaporation mother liquor treatment system and process. A hardness and impurity removal unit of the system carries out purification pretreatment on received evaporation mother liquor; the first dilution unit is used for diluting the evaporation mother liquor subjected to purification pretreatment; the filtering unit is used for filtering the evaporation mother liquor diluted by the first diluting unit; the nanofiltration membrane concentration unit is used for separating monovalent salt and divalent salt from the received evaporation mother liquor; the nanofiltration concentrated water tank is used for caching concentrated water of the nanofiltration membrane concentration unit; the freezing and recrystallizing unit is used for freezing and recrystallizing concentrated water in the nanofiltration concentrated water tank; the nanofiltration water production tank is used for caching water produced by the nanofiltration membrane concentration unit; the evaporative crystallization unit is used for performing evaporative crystallization on the received produced water of the nanofiltration produced water tank; the second dilution unit is used for diluting the received concentrated solution of the evaporative crystallization unit, and the selective membrane salt separation unit is used for carrying out monovalent salt separation on the received diluted solution of the second dilution unit. The method is wider in applicability and stable in performance; the evaporation mother liquor can be effectively treated, carnallite recycling is achieved, and the treatment cost is reduced.

The invention relates to the field of wastewater purification and discloses a vertical auto-washing filter, comprising a shell (1) and a filter unit mounted in the shell (1); the shell (1) is provided with a water inlet (3), a water outlet (4) and a dirt outlet (5), wherein the shell (1) is fitted with an exciting device (6), a dirt discharge device (11) is mounted at the shell (1), the exciting device (6) knocks at the filter unit so that impurities rarely attach to the filter unit, and the dirt discharge device (11) discharge the dirt in the filter unit when the impurities reach a certain level. The service life of the filter unit is prolonged, filtering efficiency is high, and good working environment is provided for the exciting device; in addition, the vertical auto-washing filter is reasonable in structure and high in auto-washing capacity, and may be designed into filters of different sizes.

The invention discloses a method for the super-hydrophobic modification of glass cover plate surface. The method comprises the steps of conducting the laser etching and the subsequent hydroxylation to the glass cover plate surface after cleaning treatment of the surface, forming a nano coating on the glass cover plate surface, at last using the soaking method or the chemical vapor deposition to apply the modification of low surface energy materials on the glass cover plate surface. The method has the advantages of being simple in processing, having no requirement of special equipment, being simple to promote and implement, being good in repeatability and the like. What's more noteworthy is the glass cover plate modified by the method can resist multiple times of wiping, keep the super-hydrophobic self-cleaning property even after being subject to high heat and long time ultraviolet radiation, thus being suitable for the deep space exploration shuttles operating in disastrously dusty environment.

The invention discloses sewage purifying treatment equipment for water conservancy and hydropower environment engineering. Sewage is collected, is then converged in a main pipe and firstly enters a grid-type septic tank, and the sewage intercepted by grids automatically flows into a water quantity and water quality adjusting tank for water quantity adjustment and water quality homogenization; a three-dimensional elastic filler is mounted inside a hydrolyzing and acidifying reaction tank so as to increase the number of microorganisms per unit volume, and under the action of a large number of hydrolyzing bacteria and acidifying bacteria, high molecular non-degradable pollutants are hydrolyzed into easily-degradable small molecular substances, so that the biodegradability of the sewage is improved and a foundation is laid for a subsequent treatment technology; effluent water automatically flows into an A/O biochemical tank and is reduced into C, N and O in molecular states; effluent waterautomatically flows into a built-in MRB membrane bioreaction tank, and a filtrate flows through a water collecting pipe of an MRB membrane assembly and is converged into a disinfection tank; remaining sludge is discharged into the septic tank, regularly sucked by a fecal suction truck, externally transported and disposed; waste gas is deodorized by a waste gas treatment device and emitted at a high altitude. The sewage treatment efficiency is high, waste gas emission is up to the standard, and the harmless wastewater treatment performance is strong.

The invention discloses an operation method of a self-cleaning reaction still for chemical production. The self-cleaning reaction still comprises a still body, a water inlet pipe and a water outlet pipe, wherein the water inlet pipe and the water outlet pipe are respectively arranged at the upper and lower ends of the still body; a crate is mounted at the upper end of the still body; a battery anda stirring motor are arranged in the crate; a driving gear is mounted on an output shaft of the stirring motor; and the side surface of the driving gear is meshed and connected with a driven gear. The self-cleaning reaction still has the beneficial effects of having a relatively good self-cleaning effect after being used for a long time and being time-saving, labor-saving and good in practicability without periodically maintaining and changing a wire brush.

The invention discloses a weather-resistant water-based sand-textured paint and a preparation method thereof. The weather-resistant water-based sand-textured paint is composed of a component A and a component B. When the weather-resistant water-based sand-textured paint is used, the component A and the component B are mixed according to the mass ratio of (4-8):1, and the component A is composed ofwater-based hydroxyl fluorocarbon emulsion, carbon black, sand-textured powder, water-based auxiliary agents and deionized water; the component B comprises the components in parts by mass: a hydrophilic isocyanate curing agent, an anhydrous diluent and a dehydrating agent. The product water-based sand-textured paint is convenient to construct, capable of being self-dried at normal temperature, low in VOC content and more environmentally friendly; the paint has excellent adhesive force on the surface of an aluminum profile, a paint film is resistant to boiling, the weather resistance is outstanding, and the self-cleaning effect is remarkable.

The invention belongs to the technical field of water treatment equipment, and specifically relates to a self-cleaning filter, which comprises a filter cylinder and a filtering core cylinder insertedinto the filter cylinder, wherein end covers are arranged at the two ends of the filtering core cylinder, a to-be-filtered liquid storage area is defined by the inner wall of the filter cylinder, theouter wall of the filtering core cylinder and the end covers at the two ends, a filtrate storage area is defined by the end covers at the two ends and the inner wall of the filtering core cylinder, adriving impeller is arranged at the end, close to a cleaning liquid input pipe, of the filtering core cylinder, and a cleaning liquid sprayed out of the cleaning liquid input pipe drives the driving impeller to rotate and drives the filtering core cylinder to rotate. According to the invention, the cleaning liquid is pumped into the filter through the additionally-arranged pipeline, so that the unpowered self-cleaning of the filter is realized; and the flow path of the cleaning liquid is opposite to the flow path during normal filtration, and the self-rotation of the filtering core cylinder iscombined, so that the self-cleaning efficiency can be improved, and a good self-cleaning effect is achieved.