43results about How to "Reduced diffusion area" patented technology

A screen with an improved luminance uniformity is provided. A diffusion film that is disposed at the front surface of the screen is attached to a Fresnel lens with an adhesive. The Fresnel lens is attached to a reflective layer that is deposited on a base film with an adhesive that has a refractive index lower than that of the Fresnel lens and as low as possible.

The invention discloses a medical composite dressing for wound repair. The dressing comprises an inner layer which is in contact with a wound, a middle layer and an outer layer. The dressing is characterized in that: the inner layer is a chitosan / polyvinyl alcohol / oxidized sodium alginate blended nano-fiber antibacterial layer; the middle layer is an aerogel moisture absorption layer prepared by subjecting a sodium alginate / polyvinyl alcohol / sodium carboxymethyl cellulose nanofiber membrane to shearing and freeze-drying treatment; and the outer layer is a non-woven fabric breathable layer, andthe inner layer, the middle layer and the outer layer are compounded through medical glue. According to the composite dressing, the mechanical property of the dressing is improved by utilizing an electrostatic spinning technology. Meanwhile, the nanofiber membrane prepared according to the electrostatic spinning technology and the nanofiber membrane aerogel obtained through aftertreatment have high porosity and large surface area, the excellent breathability can be achieved while the high moisture absorption and moisture retention performance is guaranteed, exudate diffusion is reduced, the skin is kept clean, and the dressing can be widely applied to recovery treatment of various wounds.

A screen with an improved luminance uniformity is provided. A diffusion film that is disposed at the front surface of the screen is attached to a Fresnel lens with an adhesive. The Fresnel lens is attached to a reflective layer that is deposited on a base film with an adhesive that has a refractive index lower than that of the Fresnel lens and as low as possible.

The invention discloses a chip-grade LED (Light Emitting Diode) packaging device with a controllable light emitting angle and a packaging process. According to the LED packaging device, first white wall adhesive layers are arranged on side faces of an LED chip, a diffusion layer and a fluorescent adhesive layer and are used as reflection surfaces; the reflection surfaces with different shapes can be designed aiming at requirements on different light emitting angles, so that the LED packaging device with the controllable light emitting angle is obtained; furthermore, the diffusion layer is arranged between the LED chip and the fluorescent adhesive layer, and the diffusion layer has a refractive index higher than that of a fluorescent adhesive; the difference between the refractive indexes of the LED chip and the fluorescent adhesive layer is reduced; the refractive indexes of the LED chip, the diffusion layer and the fluorescent adhesive layer have a certain gradient and the light emitting efficiency of the LED chip is improved, so that the luminous flux of the device is improved; the refractive indexes of diffusion powder and a packaging adhesive in the diffusion layer are different, and the condition that light emission of blue light of the LED chip is not uniform can be improved, so that the space color uniformity of the device is improved; and the design of a concave groove and white wall structure is adopted, so that the reliability problem of a product is greatly improved.

The invention discloses a sub-pixel structured planar InGaAs infrared detector chip which structurally comprises a sub-pixel structured PN node area and a carrier lateral collecting area. The infrared detector chip provided by the invention introduces a sub-pixel structure, utilizes the lateral collection effect of the carrier, and generates a situation that the photoproduction carrier in the carrier lateral collecting area can be effectively absorbed by adjacent sub-pixels; under the condition that quantum efficiency of the detector is not reduced, and a photosensor can respond uniformly; and besides, due to the structure, the diffusion heat damage is effectively reduced with a reduced diffusion area, the surface recombination is reduced with the introduction of double-layered passivation technology, the service life of the minority carrier is prolonged, and the dark current of the device is reduced; and due to the structure, as for a linear detector, the blind pixel rate can be effectively reduced, and the extension and cross talk of the photosensor are suppressed. The novel planar device structure can suppress cross talk, and reduce both device blind pixel rate and device dark current.

An actuator module including a piezoactuator, for example for a piezoinjector for metering fuel in an internal combustion engine, is proposed. The piezoactuator has piezoelements stacked one above another between an actuator head and an actuator foot and is provided with at least one elastomer layer enclosing the piezoelements. The elastomer layer is enveloped by a corrugated bellows or by telescopic tubes, composed of a material that is diffusion-impermeable with respect to a fuel to be metered by the piezoinjector. The corrugated bellows or the telescopic tubes have on their periphery grooves which can absorb expansions of the elastomer layer or of the piezoactuator.

The invention discloses a super dry and clean face layer material. The face layer material is fastened by two layers of fiber nets through hot air, the upper layer fiber net and the lower layer fibernet are both made of leather core double-component fiber, but hydrophilic finishing agents, the oiling rates, the fiber thicknesses, the fiber rolling numbers and the fiber rolling rates of the upperlayer fiber net and the lower layer fiber net are all different, the two layers of fiber nets are carded through a twin-carding machine respectively and are lapped, and the material is attached and fixed through a hot air drying box. The super dry and clean face layer material has the advantage that multiple times of quick permeating are conducted, liquid permeates downwards at a single point, theupper layer expanding area is small, and the permeating-back amount is small.

The invention discloses a novel pure cotton punched non-woven fabric and a preparation method and application thereof. The non-woven fabric is composed of 100% cotton fiber materials, the gram weight ranges from 25 g / m<2> to 50 g / m<2>, and the thickness of the non-woven fabric ranges from 0.3 mm to 1.5 mm. The preparation method comprises the steps that after the 100% cotton fiber materials are subjected to sufficient opening, impurity removing and carding for web formation through spunlace nonwoven processing equipment, high pressure water needle tangling and reinforcement are executed, a wet non-woven fabric is dried through a drum type drying device, and the pure cotton non-woven fabric is obtained. The non-woven fabric is suitable for the surfaces of personal hygiene products, the fabric has the advantages of being good in skin-friendly property, soft in hand feeling, small in wetback amount and the like, and punching can be conducted on the non-woven fabric for different patterns.

The invention discloses a spraying device with a quick drying function for production of steel sheets of windscreen wipers, and relates to the technical field of production of automobile parts. The spraying device specifically comprises a base, a screw rod chuck mechanism, a wedge clamping mechanism, a spraying mechanism and a quick drying mechanism, wherein a supporting column is arranged at oneend of the top end of the base; and the screw rod chuck mechanism is arranged at the bottom end of a lifting ring. According to the spraying device with the quick drying function for production of thesteel sheets of the windscreen wipers, the quick drying mechanism is arranged, a circulating mechanism is arranged, so that uniform distribution of the temperature in a cavity of a rack is guaranteed; a sliding groove which is shaped like a Chinese character 'jing (well)' is formed in the surface of a drying layer, so that a magnetic base can freely move on the surface of the sliding groove conveniently, and the adaptability to to-be-dried materials of different types and specifications is high; the magnetic base guarantees effective adsorption, and meanwhile, the contact between the magneticbase and the to-be-processed materials is reduced, so that the drying effect is guaranteed; and the drying layer and a heating layer can run at different rates due to the arrangement of a differential mechanism, so that the to-be-dried materials are uniformly heated, the drying rates of different parts are consistent, and the applicability is higher.

The invention relates to the technical field of injection molding, and discloses an injection mold device. The injection mold device comprises an injection molding gun head, a fixed mold, a movable mold and a hydraulic cylinder; the outer wall of the right end of the injection molding gun head is fixedly connected with a plastic guide barrel, and the inner walls of the top face and the bottom faceof the plastic guide barrel are each fixedly connected with a spring A; clamping blocks are fixedly connected with the ends, away from the inner wall of the plastic guide barrel, of the two springs A; the face, away from the injection molding gun head, of the plastic guide barrel is fixedly connected with the fixed mold; insertion holes A are formed in the upper end and the lower end of the sideface of the fixed mold correspondingly; each inserting hole is provided with an inserting rod in a sleeved mode, and the left ends of the two inserting rods are fixedly connected with the movable mold; and mold cavities are formed in the faces, corresponding to the movable mold, of the inserting rods. A circulating cooling pipe is separated from the fixed mold and the movable mold through injection molding pressure, the problem that resistance is increased and even blockage is caused due to raw material cooling in the injection molding process is avoided, and the circulating cooling pipe is automatically connected with the fixed mold and the movable mold after injection molding is completed, so that cooling molding of the raw materials is ensured.

The invention discloses a planar lateral collection structure indium gallium arsenic infrared detector chip which comprises an N-type InP substrate, an N-type InP layer, an indium gallium arsenic intrinsic absorption layer, an N-type InP cap layer, a silicon nitride diffusion covering film layer, at least two rectangular carrier lateral collection diffusion barrier regions, a PN nodal region formed by diffusion and a carrier lateral collection region. A single Au layer grows on the periphery of a photosensitive unit to form a P electrode, silicon dioxide is deposited on the surface of the chip to form a silicon dioxide transmission enhanced layer, a P electrode hole is opened by a wet etching process, Cr and Au sequentially grow to form a thickened electrode, the edge length of each carrier lateral collection diffusion barrier region is 5-10 micrometers, the carrier lateral collection diffusion barrier regions are arranged in an aligned or area arrayed manner and are the same in center distance, and the P electrode and the thickened electrode are annular covering electrodes and are the same in inside dimension. Heat diffusion regions are decreased, so that heat diffusion loss is effectively decreased, and the dark current and the blind-pixel rate of a device are reduced while response uniformity of the photosensitive unit is kept.

The invention discloses a self-adjustment intelligent ultrasonic humidifier, and belongs to the technical field of air conditioning. The self-adjustment intelligent ultrasonic humidifier comprises an ultrasonic generator, a humidifier shell, a water containing box, a nozzle, a temperature and humidity sensor and a control unit. The control unit comprises a single chip microcomputer containing a calculation program, a triode set and parallel-connection resistors. A spiral guide vane is arranged inside the nozzle. The temperature and humidity sensor is connected with the input end of the single chip microcomputer through a data line. An I / O port in the single chip microcomputer is connected with a base electrode of the triode set. One end of a potentiometer is connected with an emitting electrode of the triode set. The other end of the potentiometer is connected with the ultrasonic generator. According to the self-adjustment intelligent ultrasonic humidifier, the temperature and humidity sensor receives an external environment signal and then transmits the external environment signal to the control unit, and then the control unit changes the humidifier through the calculation program of the single chip microcomputer to achieve automatic adjustment of the size of the humidification amount so as to meet the requirement for the comfort level of the human body. Meanwhile, due to the fact that the spiral guide vane is arranged inside the nozzle, the mist spraying and rotational flow effects can be achieved, the diffusion rate and area of spraying mist are reduced, and therefore the partial humidification function is achieved.

The invention discloses a method for preparing a sub-pixel structured planar InGaAs infrared detector chip, which comprises the following steps of: 1, extension material cleaning; 2, silicon nitride diffusion mask sedimentation; 3, first photoetching ; 4, sub-pixel diffuse window opening; 5, photoresist stripping; 6, closed pipe diffusion; 7, open-pipe piece taking; 8, second photoetching; 9, P electrode growing; 10, photoresist stripping; 11, silicon dioxide antireflection film sedimentation; 12, P electrode annealing; 13, third photoetching; 14, P electrode hole forming; 15, photoresist stripping; 16, fourth photoetching; 17, P electrode thickening; 18, photoresist stripping; 19, back side polishing; 20, N electrode growing; and 21, scribing. According to the invention, under the condition that the quantum efficiency of the prepared detector is not reduced, the photosensor can respond uniformly, the service life of the minority carrier is increased, and the dark current of the device is reduced; and due to the structure, as for a linear detector, the blind pixel rate can be effectively reduced, and the extension and cross talk of the photosensor are suppressed.

The invention provides an intelligent acupoint detection massage instrument for treating insomnia, and belongs to the technical field of massage. The intelligent acupoint detection massage instrumentcomprises a shell, a handle and massage balls, and comprises an automatic oil supply assembly and an aromatherapy assembly; a fixing column perpendicular to the upper end surface of the shell is fixedly connected to the center of the upper end surface of the shell, massage ball seats are fixedly connected to the four corners of the lower end surface of the shell respectively, and the handle is fixedly connected to the top end of each fixing column; each massage ball is connected into each massage ball seat in a matched and rolling manner; rolling massage is achieved by arranging the massage balls, the stimulation intensity on acupuncture points is improved by additionally arranging protruding blocks on the surfaces of the massage balls, and the massage effect is improved; by additionally arranging an L-shaped anti-skid piece, the massage instrument is prevented from sliding off from the hand due to unstable holding; essential oil can be automatically supplied through an automatic oil supply assembly, and the massage comfort is improved; and by additionally arranging an aromatherapy assembly, an aromatherapy function can be provided to assist in soothing nerves, and the sleep quality is improved.

The invention discloses triaxial sensor production equipment with a positioning etching function, and relates to the technical field of electronic part production, in particular the equipment comprises a base, a spraying mechanism, a self-locking limiting mechanism, a synchronous lifting mechanism and a flow control mechanism, supports are arranged on the two sides of the base, and a spraying headis arranged at the end, away from a guide column, of a positioning ring. According to the triaxial sensor production equipment with the positioning etching function, through the arrangement of the spraying mechanism and the self-locking limiting mechanism, the problem that when equipment personnel conduct spraying head installation, due to lack of accurate guiding positioning, most of spraying heads are ensured to be perpendicular in a manual visual inspection mode is solved; the self-locking limiting mechanism can achieve rapid butt joint of the guide column and the spraying head through thepositioning ring in a clear guiding mode, locking of the rotor wing and the positioning ring can be rapidly achieved; meanwhile, abnormal falling between the spraying head and the main body in the working process is prevented through the self-locking structure, the unlocking process under the controllable condition is rapid, easy and convenient, and applicability is higher.

The invention relates to the technical field of injection molding, and discloses an injection mold device, which includes an injection gun head, a fixed mold, a movable mold and a hydraulic cylinder. The inner wall of the bottom surface is fixedly connected with a set of springs A, and the ends of the two sets of springs A away from the inner wall of the plastic guide tube are fixedly connected with a clamp block. The side of the plastic guide tube away from the injection gun head is fixedly connected with the fixed mold, and the upper and lower ends of the fixed mold side Both sockets A are provided, and inserting rods are sleeved in the two sockets A. The left ends of the two inserting rods are fixedly connected to the movable mold. The corresponding sides of the inserting rod and the movable mold are provided with mold cavities. The pressure makes the circulating cooling pipe separate from the fixed mold and the movable mold, avoiding the cooling of the raw material during the injection molding process, resulting in increased resistance or even blockage, and the circulating cooling pipe is automatically connected to the fixed mold and the movable mold after the injection molding is completed, so as to ensure the cooling of the raw material forming.

The invention relates to the field of processing of jasmine flowers, in particular to a tubular jasmine flower aroma substance extraction pretreatment device. The technical problem of the invention is to provide a tubular jasmine flower aroma substance extraction pretreatment device. According to the technical scheme, the tubular jasmine flower aroma substance extraction pretreatment device comprises a supporting frame, an operation control screen and the like; and the operation control screen is connected with the support frame. Degreasing cotton and jasmine flowers are alternately distributed in the pipes, the diffusion area of jasmine flower fragrance is reduced, fragrance diffusion is accelerated through wind blowing, the fragrance collection rate is greatly increased, gaps are reserved between the jasmine flowers, illumination is uniform, degreasing cotton balls are rubbed into balls, and the fragrance is collected more evenly. Furthermore, the area of the absorbent cotton ball for absorbing the jasmine flower fragrance is increased, so that the absorbent cotton can quickly collect the fragrance.

The invention provides an one-off absorbing product. The one-off absorbing product comprises a hydrophilic surface material, an absorbing core layer, a bottom impervious material, and a multi-layer composite flow guide material which is located between the hydrophilic surface material and the absorbing core layer; the flow guide material comprises two layers of fiber meshes; the surface fiber mesh is prepared from skin-core double-component fibers which are regularly arranged along the length direction after being treated by a hydrophilic oily agent at a plurality of times; the surface fiber mesh is adhered and fixed through hot air; the lower fiber mesh is prepared from viscose acetal fibers and polyester fibers and is fixed by a spunlace entanglement manner; the lower fiber mesh has the characteristic of being loose in top and dense in bottom, namely, the upper surface is loose, and the lower surface is dense; the two layers of fiber meshes are adhered by spraying high-hygroscopicity hot melt adhesive; the composite flow guide material has the characteristics that liquid can permeate fast at a plurality of times and returns a little; the liquid is mainly dispersed along the length direction and is dispersed in a small area on the surface layer and in a large area on the lower layer; the dispersing area ratio of the lower layer material to the upper layer material is more than 15. The absorbing product has the characteristics of being dry and clean in surface, and comfortable to wear.

The invention relates to the technical field of pond dredging and discloses a small submersible pond sludge sucking device. The small submersible pond sludge sucking device comprises a sludge pump anda shell of an arc structure. A fixing block is fixedly connected to the center position of the inner wall of the lower end of the shell through an installation hole, and a cylinder groove is formed in the lower end of the fixing block. A stirring structure is arranged in the cylinder groove, and the input end of the sludge pump is fixedly connected with a connecting pipe. One side of the fixing block is fixedly connected with a pipe opening of the connecting pipe through a round hole, and the connecting pipe communicates with the cylinder groove. The upper end of the shell is fixedly connected with an output pipe through a through hole, and the lower end of the output pipe penetrates the through hole and is fixedly connected with the output end of the sludge pump. The right side of the shell is rotationally connected with a rotating shaft through a first sealing bearing. The small submersible pond sludge sucking can directly enter the water bottom to conduct dredging work, the size ofthe sludge removing dredging equipment is small, work is flexible, the device can also flexibly move under the water, and efficient and fast sludge removing work is achieved.

The invention discloses an MOCVD reaction system. The MOCVD reaction system comprises an MOCVD reaction chamber, a heating plate arranged in the MOCVD reaction chamber and a sprayer arranged above the heating plate, wherein the sprayer is provided with a spraying hole for spraying metal organic source gas towards the direction of the heating plate; and the sprayer is fixedly connected with two baffle plates which are blocked at the left side and the right side of the spraying hole separately. According to the invention, the mixing efficiency and uniformity of the metal organic source gas entering the MOCVD reaction chamber can be improved, so that the quality of a superconducting thin film is improved.

The invention discloses a solid beverage with a dampness-removal effect and a preparation method thereof. On the basis of black tea matrix raw materials, the solid beverage is prepared by adding the following Chinese herbal medicines: fortune eupatorium herb, dandelions, poria cocos, cablin patchouli herb, Chrysanthemums, mung beans and coix seeds which have a dampness-removal effect. The beveragehas the advantages of simple preparation method, convenient eating, convenient carrying, instant brewing, instant eating, pure natural formula, no toxicity, no side effect, capability of quickly andeffectively removing dampness in human body, effects of removing dampness, promoting dieresis and clearing away heat and toxic materials, relief of symptoms of abdominal fullness and distention, nausea, vomiting, anorexia, sloppy diarrhea and the like caused by dampness invasion, and strong dampness-removal function.

The invention discloses a liquid crystal composition with negative dielectric anisotropy. The liquid crystal composition contains the following compounds in percentage by total weight of the negativeliquid crystal composition: 20%-65% of one or more compounds of a general formula I-1 and / or a general formula I-2, 10%-40% of one or more compounds of a general formula II, 13%-40% of one or more compounds of a general formula III and 20%-60% of one or more compounds of a general formula IV. The invention further discloses a liquid crystal display containing the liquid crystal composition. The formulae are shown in the descrption.

The invention discloses a tobacco cultivation structure and a method of the tobacco cultivation. The tobacco cultivation structure comprises an inverted-cone-shaped transparent shell, an oval transparent guide plate is fixed to one side of the upper end of the transparent shell, the oval transparent guide plate is obliquely arranged, and a groove is formed by the oval transparent guide plate and the transparent shell. According to the tobacco cultivation structure and the method of the tobacco cultivation, the transplanting technology that tobacco is free of film mulching and pollution, the use amount of rooting water is reduced, and hail is prevented can be thoroughly achieved, and the tobacco yield is guaranteed while the cost input of tobacco growers and the labor amount are reduced.

The invention provides a buffering water pool and a water treatment system, and relates to the technical field of water treatment equipment. The buffer water pool comprises a buffer water pool, a mudscraping machine, a center tube and a mud discharging passage, wherein the mud scraping machine is arranged inside the buffer water pool, and comprises a center rotating shaft and a mud scraping plate; the center rotating shaft is arranged in the buffer water pool and extends to the bottom of the buffer water pool; the mud scraping plate is in synchronous rotating connection with the center rotating shaft and is arranged at the bottom end of the center rotating shaft; the center tube is in synchronous rotating connection with the center rotating shaft and is sheathed at the outer side of the center rotating shaft; a feeding passage is formed inside the center tube and extends to the bottom of the buffer water pool along the center tube, so that sewage is introduced into the bottom of the buffer water pool from the feeding passage; the mud discharging passage is arranged at the bottom of the buffer water pool and is communicated with an inner cavity of the buffer water pool. The filthymud diffusion area can be reduced; the settling speed is accelerated, so that the whole buffering turbidity can be effectively improved. The problem of center mud silting of the mud scraping machine can also be effectively solved; the smooth discharging of filthy mud at the bottom of the buffer water pool is ensured.

The invention discloses a composite dressing for medical wound repair, which comprises an inner layer, an intermediate layer and an outer layer in contact with the wound, and is characterized in that the inner layer is chitosan / polyvinyl alcohol / oxidized alginic acid A nanofiber antibacterial layer blended with sodium; the middle layer is an airgel moisture-absorbing layer prepared by sodium alginate / polyvinyl alcohol / sodium carboxymethylcellulose nanofiber membrane through shredding, freeze-drying, etc.; The outer layer is a non-woven breathable layer, and the inner layer, the middle layer and the outer layer are compounded by medical glue. The composite dressing of the present invention improves the mechanical properties of the dressing by using the electrospinning technology, and at the same time, the nanofiber membrane airgel prepared according to the electrospinning technology and the post-treatment have high porosity and large surface area, and can While ensuring high moisture absorption and moisturizing performance, it also has excellent air permeability, reduces the diffusion of exudate, and keeps the skin clean. It can be widely used in the recovery treatment of various wounds.

The invention relates to the technical field of medical environment cleaning, and particularly discloses a multi-functional cleaning device for cleaning vomit on the ground in the digestive system department. The multi-functional cleaning device comprises a mounting rack, a first cleaning device and a second cleaning device which are respectively arranged on the mounting rack and are used for cleaning the vomit on the ground, and a linkage device which is arranged on the mounting rack and is used for providing power for the first cleaning device and the second cleaning device respectively. The linkage device comprises a rear shaft movably arranged behind the mounting rack, two rolling wheels arranged at the two ends of the rear shaft respectively and used for driving the rear shaft to rotate, a first linkage structure arranged on the rear shaft and connected with the first cleaning device, and a second linkage structure arranged on the rear shaft and connected with the second cleaning device. According to the device, the diffusion range of vomit can be reduced, the cleaning speed of the vomit on the ground is increased, and the cleaning efficiency and quality are guaranteed.

The invention relates to an antibacterial sanitary towel preparation technology which comprises the steps that S1, a bottom layer and a body are pressed through a first roller set to form a first mixing layer, and a first welding device controls a first power mechanism to weld the first mixing layer at a first preset welding position; s2, a first detection device obtains a first mixed layer impressing image after welding; s3, the surface layer and the first mixing layer are pressed through a second roller set to form a second mixing layer, and a second welding device controls a second power mechanism to weld the second mixing layer at a second preset welding position; s4, the second welding device imprint the second mixed layer to form a plurality of flow isolation areas, and the first detection device obtains an imprint image of the second mixed layer after welding; and S5, the second detection device evaluates the absorption rate of the welded second mixed layer, and the control device produces qualified sanitary napkins. The absorption rate and the liquid diffusion speed of the sanitary towel meet preset standards by adjusting the flow isolation area of the sanitary towel.

The invention discloses polishing equipment for a small side plate of a table tennis bat handle. The polishing equipment comprises a shell, a polishing head, a driving machine, a dust absorption assembly, a telescopic adjusting assembly and a dust accumulation assembly, wherein a mounting groove is formed in the shell; the polishing head is mounted at an opening of the mounting groove; the driving machine is fixedly mounted in the shell and is used for driving the polishing head to rotate; the dust absorption assembly comprises a connecting lantern ring and fan blades, and the multiple fan blades are annularly and rotationally connected to the side wall of the connecting lantern ring; the telescopic adjusting assembly is installed between the polishing head and the driving machine and is used for changing and fixing the horizontal position of the fan blades, and the telescopic adjusting assembly is sleeved with the connecting lantern ring in a limiting mode; and the dust accumulation assembly is installed on the side wall of the shell in a sealed mode and is used for collecting the dust absorbed by the dust absorption assembly. According to the polishing equipment, generated dust is collected, so that dust accumulation caused by polishing is avoided, the condition that the sight of polishing personnel is not blocked is ensured, and the polishing progress is accurately mastered.

The invention discloses a range hood, belongs to the technical field of household appliances, and is designed for solving the problems that oil smoke in an existing range hood is easy to diffuse and the like. The range hood provided by the invention comprises a box body, wherein a smoke exhaust channel is formed in the box body; the exhaust fume collecting hood is provided with an air inlet, and the air inlet is connected to the exhaust fume discharging channel through the exhaust fume collecting channel; and the rectifying plate is arranged between the smoke discharging channel and the smoke collecting channel, and the rectifying plate is configured to be capable of limiting the flowing path of the oil smoke. According to the range hood provided by the invention, the space where oil fume can reach when flowing in the range hood can be reduced, the diffusion area of the oil fume is reduced, the risk of oil stain permeation is reduced, and the problems that parts in the range hood are instable in work and short in service life due to permeation of the oil fume are solved. The rectifying plate realizes rectification of fluid in the range hood, the disorder degree of the fluid in the range hood is reduced, the oil smoke discharging efficiency is higher, the impact of the fluid on the interior of the range hood is smaller, and the noise is lower.

The invention provides a rainwater leakage prevention structure for a precast concrete external wall panel. The precast concrete external wall panel is composed of precast concrete slabs and structural components, wherein a horizontal gap separating belt is formed at the intersection position of the upper and lower adjacent precast concrete slabs, a vertical gap separating belt is formed at the intersection position of the left and right adjacent precast concrete slabs, horizontal connecting pieces used for connecting the upper and lower adjacent prefabricated concrete slabs are arranged at the horizontal gap separating belt position, the horizontal connecting pieces comprise a water separation component I and a water conveying component I which are perpendicular to each other, and vertical connecting pieces used for connecting the left and right adjacent prefabricated concrete slabs are arranged at the vertical gap separating belt position, and each vertical connecting piece comprises a water separation component II and a water conveying component II which are perpendicular to each other. According to the rainwater leakage prevention structure, the upper and lower adjacent prefabricated concrete slabs are connected through the horizontal connecting pieces, the left and right adjacent prefabricated concrete slabs are connected through the vertical connecting pieces, the structure is simple, and assembling and using are convenient.