135results about How to "Adjustable volume" patented technology

The invention discloses a piezoelectric sensor. The piezoelectric sensor comprises an induction component, wherein the induction component comprises a piezoelectric material and a pair of electrodes positioned on the upper surface and the lower surface of the piezoelectric material; an encapsulated shell is wrapped outside the induction component; the pair of electrodes on the piezoelectric material are connected with each other through a screened lead running through the encapsulated shell; and the encapsulated shell is prepared by mixing epoxy resin, a curing agent and cement according to the mass ratio of the epoxy resin to the curing agent to the cement of 1:0.4:1. The invention also discloses a preparation method of the piezoelectric sensor, a beam type concrete sensor comprising the piezoelectric sensor and application thereof. The piezoelectric sensor is stable in signal, high in signal to noise ratio, small in road surface damage degree, high in durability, simple in preparation process and low in cost. The beam type concrete sensor is simple in preparation, adjustable in volume, high in sensitivity, high in response speed, insusceptible to damage during construction; and the calculated running speed of a vehicle is basically consistent with the actual running speed of the vehicle, the measuring result is accurate and the error is small.

The invention discloses a magnetic nanoparticle / macromolecular Janus microparticle and a preparation method and application thereof. The method comprises the following steps: (1) respectively charging a dispersion phase and a continuous phase into different passages in a micro-fluidic chip, finally mixing the dispersion phase with the continuous phase, and obtaining a single-emulsion-drop system on the other end of the micro-fluidic chip, wherein the dispersion phase is prepared from magnetic nanoparticles, a macromolecular polymer and an organic solvent, and the continuous phase is an aqueous solution of a surface active agent; (2) standing the single-emulsion-drop system obtained in the step (1) at room temperature, then standing in a magnetic field, after the standing is completed, heating to remove the organic solvent in the system, and washing with water. The method is novel, simple in process, common in equipment, good in operability and powerful in functions. The obtained microparticle is good in single monodispersion and has magnetism; and other functional materials can be added, so that integration of multiple functions of the material is realized.

The invention discloses a SiC enhanced aluminum-based composite material for a spacecraft and a preparation method thereof. The composite material consists of the following chemical ingredients in percentage by weight: 23 to 35 percent of SiC, 26 to 35 percent of Si, 1.8 to 2.0 percent of Mg and the balance of Al and inevitable impurities. The method comprises the following steps of: performing surface treatment of powder, performing high-energy ball-milling mixing under vacuum by a wet method, and performing hot pressed sintering under the vacuum. The thermal expansivity and density of the material can be reduced effectively and the tensile strength can be improved by controlling the addition of the SiC and an alloy element Mg and a preparation process, so that the composite material which is low in cost and high in corrosion resistance and of which the thermal expansivity is 7 to 9*10<-6> / DEG C, the density is less than 2.7 g / cm<3> and the tensile strength is more than 230 MPa is obtained. The SiC enhanced aluminum-based composite material is particularly suitable for aerospace parts which are light in mass, low in expansion and resistant to corrosion and have certain strength.

The invention provides a beam splitting double-focus-point laser processing head, which comprises a light path cavity, a cavity connecting box, a servo motor and an external connecting flange, wherein the light path cavity is connected with an output shaft of the servo motor through a shaft coupler, a beam splitting mirror, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a focusing mirror and two telescopic sleeves are arranged inside the light path cavity, the beam splitting mirror and the first reflecting mirror are respectively and fixedly arranged on the side wall of the light path cavity through a regulating mirror seat, the second reflecting mirror and the third reflecting mirror are respectively arranged on the telescopic ends of the two telescopic sleeves through a regulating mirror seat, and the fixing ends of the telescopic sleeves are arranged on the side wall of the light path cavity. The beam splitting double-focus-point laser processing head has the advantages that an incident laser beam is subjected to space beam splitting, the front focusing point and the back focusing point are realized, the relative space position between the double light beam focusing points is changed, the utilization efficiency of laser energy is improved, the laser welding plasma shielding effect can be effectively inhabited, the processing depth is improved, and the laser processing quality is improved.

The invention discloses a composite hydrogel with synchronous evaporation heat dissipation and waste heat recovery capabilities, and a preparation method and a heat management method thereof. The composite hydrogel is composed of a hydrogel with a cross-linked structure, a hygroscopic salt and a chemical thermoelectric solution. The preparation method comprises the following steps: preparing the hydrogel with the cross-linked structure; and heating and drying the hydrogel with the cross-linked structure, soaking the dried hydrogel in a solution formed by the hygroscopic salt and the chemical thermoelectric material, and taking out the hydrogel after the hydrogel is completely swelled to obtain the composite hydrogel with synchronous evaporation heat dissipation and waste heat recovery capabilities. The composite hydrogel can take away a large amount of heat through water evaporation at a high temperature, and meanwhile part of the heat is converted into electric energy, and the electric energy is output in a chemical thermoelectric conversion mode; and moisture in air can be absorbed at low temperature for automatic water supplement. The composite hydrogel has the characteristics of simple structure, excellent performances, convenience and intelligence, can synchronously remove waste heat and recover waste heat for a heating object, and solves the problem of waste of high-heatand low-grade heat energy.

The invention belongs to the technical field of artificial cornea production and more particularly provides an active regenerating artificial cornea implant and a preparation method thereof. The artificial cornea implant comprises 5-30 shares of chitosan, 5-30 shares of collagen, 0.1-0.5 share of chondroitin-sulfuric acid, 5-10 shares of polyethylene glycol, 5-25 shares of polyvinyl alcohol and 15-80 shares of triple-distilled water; preferably the artificial cornea implant also comprises appropriate amount of cornea cell growing factor, fibronectin and laminin. The preparation method of the active regenerating artificial cornea implant is as below: dissolving the chitosan, the collagen and the chondroitin-sulfuric acid in hydrochloric acid, acetic acid and water respectively, and then infusing the mixture of the components which are agitated uniformly at the room temperature into a mould for drying, and then obtaining the product after water immersion, cleaning and drying. The artificial cornea implant has good biocompatibility, high substance rigidity and good transparency; the preparation method is easy to be operated, the raw materials are easy to be obtained and are cheap, and large-scale industrialized production can be performed.

The invention discloses an intelligent household background music system, mainly comprising the following modules: a household background music broadcast and control host module, a household music remote controller module, a DSP (Digital Signal Processor) signal processing module, a control panel module, a high-definition digital frequency modulation and radio module, a peripheral USB (Universal Serial Bus) interface and built-in MP3 (Moving Picture Experts Group Audio Layer-3) module, a response switching module and a data processing module. The system adopts a ceiling sound box, and the ceiling sound box does not occupy space, prevents oil, smoke, water and gas and is fused together with a ceiling, which does not influence the integral appearance of the decoration and can beautify space and take very good decorative effect. In any one house including a parlour, a bedroom, a kitchen or a toilet, a background music wire is respectively distributed, and through one or more than one sound source, beautiful background music can be heard in each room.

The invention discloses a lateral flow immune detection system based on a centrifugal microfluidic system. The centrifugal microfluidic system comprises a centrifugal microfluidic chip, the lateral flow immune detection system comprises a lateral flow immune reaction membrane, a lateral flow immune detection chip, and a centrifugal operating and controlling device, wherein the lateral flow immunereaction membrane is used for communicating an upstream reaction chamber and a downstream reaction chamber of the centrifugal microfluidic chip, and adjusting the flow rate of liquid flowing through the lateral flow immune reaction membrane by adjusting and controlling the centrifugal rotating speed; the lateral flow immune detection chip comprises a sample addition chamber, a reaction chamber, alateral flow reaction membrane pipeline, a liquid waste tank, and a micro-pipeline, and the lateral flow immune detection chip is used for carrying on preset sample treatment of target samples and detecting the treatment process of the target samples; and the centrifugal operating and controlling device is used for carrying on rotating speed adjustment, positioning and imaging of the lateral flowimmune detection chip. The lateral flow immune detection system integrates lateral flow immune detection and a centrifugal microfluidic technology, thus lateral flow immune detection with the adjustable sample volume and the reaction liquid flow rate can be realized, and the higher detection effect is realized.

The invention belongs to the field of culture simulation experiment research on cold spring high-pressure large organisms or microorganisms, and particularly relates to a high-pressure temperature-control simulated culture device for deep sea cold spring organisms and a using method of the high-pressure temperature-control simulated culture device. The simulated device comprises a mixing cabin, a high-pressure cabin, a high-pressure filter device and various valve bodies which are connected through high-pressure pipelines. In the high-pressure cabin, a deep-sea high-temperature or low-temperature high-hydrostatic-pressure environment is realized through high-pressure pumps and a temperature control system, and besides, the culture, enrichment and fixation technology of large organisms and microorganism thalli under high pressure is realized through an enrichment filtering device and a fixing device. A culture device and the enrichment filtering device can be externally expanded, and most of materials are high in corrosion resistance, low in cost and adjustable in size.

The invention relates to a manufacturing mould for an annular shearing test sample. The manufacturing mould comprises a base 3. The manufacturing mould is characterized by further comprising an inner ring 1, an outer ring 2, a base 3 and an annular cover 4; an inner annular slot and an outer annular slot which are respectively used for accommodating the inner ring 1 and the outer ring 2 are formed on the base; the inner annular slot and the outer annular slot are concentric with each other; the outer ring 2 is encircled by more than two annular arcs; an inner diameter of the annular cover 4 is matched with an outer diameter of the inner ring 1; and the outer diameter of the annular cover 4 is matched with the inner diameter of the outer ring 2. The height of the annular cover is confirmed according to the height of the to-be-manufactured mould.

The invention discloses a metal product selling rack. The metal product selling rack comprises bases, wherein rollers are arranged at the bottoms of the bases, the bases adopt a hollow structure, a telescopic plate is connected in the middles of the bases, two ends of the telescopic plate extend into the bases, limiting blocks are fixedly connected in two ends of the telescopic plate, one end, far away from the telescopic plate, of each limiting block is fixedly connected with a spring, and the other end of the spring is fixedly connected with the inner wall of the corresponding base. The metal product selling rack is novel in structure and convenient to use; through improvement of the bases, matched use of the limiting blocks, pin holes, fixing pins and the springs and matching with connecting rods, the size-adjustable effect is realized, a seller can adjust the size of the selling rack according to the space size, the effect of facilitating selling is realized, and the quantity of sales is increased; through improvement of hooks and damping devices, friction and collision of metal products are reduced when the selling rack is moved, the selling level is improved, and burden of a sales person is relieved.

Fluid filtration devices, systems and methods are disclosed. The device comprises, for example, an influent feed tube; an influent receiving bowl in fluid communication with the influent feed tube; and a plurality of radial arms having filters therein configured to rotate about an axis within the influent receiving bowl. The fluid filtration devices, which can be configured to filter a wide variety of fluids, comprises: an influent feed tube; an influent receiving bowl in fluid communication with the influent feed tube; and a plurality of radial arms having filters therein configured to rotate about an axis within the influent receiving bowl. Additionally, methods are provided for that comprise, for example: obtaining an influent from a target source of fluid to be filtered; filtering the influent in a first filtration step; filtering the influent in a second filtration step upon receiving effluent from the first filtration step by transferring influent through a plurality of radial arms by rotating the radial arms having filters disposed therein about an axis in a filtration unit; and emitting a final filtered fluid effluent.

The invention relates to the field of medical rehabilitation training equipment, and discloses an ankle joint training device for orthopedic patients. The ankle joint training device comprises a calfprotective plate and a foot pedal, wherein the calf protective plate has a horizontal adjustment structure; the horizontal adjustment structure comprises a cross plate; a connecting block is connectedwith a rotating shaft; the rotating shaft is connected with a second tooth plate; the cross plate is connected with a second electric telescopic rod; the second electric telescopic rod is connected with a second L-shaped tooth plate; the second L-shaped tooth plate is connected with the second tooth plate; the rotating shaft is provided with a vertical adjustment structure; magic tapes and magicback glue are adhered to the foot pedal and the calf protective plate; a groove is formed in the foot pedal and is provided with a limiting sliding slot; positioning screw holes are uniformly formed in the bottom of the limiting sliding slot; the limiting sliding slot is internally connected with a limiting sliding block; the limiting sliding block is in threaded connection with a positioning boltthrough threaded holes; the bottom of the positioning bolt is in threaded connection with the positioning screw hole; and the top of the limiting sliding block is fixedly connected with a movable plate. According to the ankle joint training device for the orthopedic patients disclosed by the invention, ankle joints of the patients do left and right movement, so that the device can conveniently make up-down left-right training of the ankle joints; and moreover, the device is comprehensive in training projects and has a good recovery effect.

The invention discloses a manufacturing die of a large-length-diameter-ratio carbon fiber composite pipe. The manufacturing die is composed of a lower die body, a middle die body and an upper die body. The lower die body is formed by connecting multiple lower die plate blocks, and the upper die body is formed by connecting multiple upper die plate blocks. Lower die grooves are formed in the two sides of the upper surface of each lower die plate block, the middle die body is composed of two middle die plate block units connected through a connector, each middle die plate block unit is formed byconnecting multiple middle die plate blocks, middle die convex blocks cooperating with the lower die grooves are arranged on the lower surfaces of the middle die plate blocks, middle die grooves areformed in the upper surfaces of the middle die plate blocks, and upper die convex blocks cooperating with the middle die grooves are formed in the two sides of the lower surfaces of the upper die plate blocks. The invention further discloses a forming method of the large-length-diameter-ratio carbon fiber composite pipe. According to the method, the carbon fiber composite material pipe with the length-diameter ratio larger than 60 is prepared through the combination of air bag pressurizing and the die pressing process. By means of the die, the length-diameter ratio of the pipe is increased, and the forming efficiency is improved. By means of the method, the dimensional precision and the surface quality of the pipe are improved.

The invention belongs to the technical field of submarine cable inspection, and discloses a portable submarine cable inspection unmanned underwater vehicle which comprises a main engine room, a driving assembly, a gas cylinder and a steering engine which are arranged on a frame, the moving posture and the sinking and floating state of the main engine room are adjusted by arranging the driving assembly and the gas cylinder, and the size and the weight of the gas cylinder are adjustable; the steering engine adjusts the working angle and attitude of the sensing assembly under the action of the controller, so that the sensing assembly can realize the positioning of the submarine cable position by the main engine room and the tracking inspection of the submarine cable by the main engine room, and an image acquisition device is arranged on the main engine room and can communicate with a ground console through the controller. And high-precision and high-accuracy patrol detection of the submarine cable is realized. The portable unmanned underwater vehicle is not affected by tides, manpower and material resource cost is saved, operation is easy, carrying is convenient, the total weight of the main engine room, the driving assembly, the steering engine and the sensing assembly is small, and the size is small, so that the portable unmanned underwater vehicle is achieved.

The invention discloses a free-range poultry house feeding device manufacture method. The method includes A, selecting a plurality of stainless steel plates firstly, allowing the thickness of the stainless steel plate to range from 2mm to 3mm, and stamping and forming a feed disc, a feed tank and a base through a stamper; B, welding and fixing the base, the feed disc and the feed tank sequentially from bottom to top; C, mounting large grids and small grids in the feed disc, and allowing the large grids and the small grids to rotate in the feed disc and adopt the feed tank as the circle center. The method has the advantages that the manufacture method is simple, the produced product is simple in structure, strength is high, and different large grids and small grids can be configured, assembled and disassembled flexibly.

The invention relates to a preparation method of an isotropic ceramic nanowire preform, which comprises the following steps: loading a polymer precursor on activated carbon powder to form a mixture, pressing the mixture into a green body template; cracking the polymer precursor on the template at a certain temperature to grow a large number of nanowires which are crossed and lapped with one another; then performing oxidation to remove the activated carbon to prepare the isotropic ceramic nanowire preform material with the interconnected three-dimensional network structure. The nanowires in theisotropic ceramic nanowire preform prepared by the method are pure in component, uniform in structure, controllable in size and adjustable in volume fraction. The method has the advantages of simpleprocess steps, short period, relatively low cost, good stability and good repeatability. Meanwhile, the ceramic nanowire preform has the functions of heat insulation, light weight, electricity, opticsand the like, requirement for multifunctional integration is expected to be met, and the application field of ceramic matrix composite materials is expanded.

The invention discloses a silencer and an air conditioner. The silencer comprises a first silencing structure, a second silencing structure and a separating plate, and the first silencing structure comprises an air inlet pipe, an air outlet pipe and a silencing part; the silencing part comprises a first expansion cavity and at least two through holes formed in the side wall of the first expansioncavity, and the air inlet pipe and the air outlet pipe communicate with the first expansion cavity; the second silencing structure comprises a second expansion cavity, and the first silencing structure is arranged in the second expansion cavity; the separating plate is arranged between the outer wall of the first silencing structure and the inner wall of the second expansion cavity, and the secondexpansion cavity is divided into a first cavity body and a second cavity body through the separating plate; and the first cavity body communicates with the first expansion cavity through at least onethrough hole, and the second cavity body communicates with the first expansion cavity through at least one through hole; and the separating plate can be moved relative to the first silencing structure so that the volumes of the first cavity body and the second cavity body are adjustable. According to the silencer, full-band silencing can be achieved, and the silencing effect is good.

The invention provides a 3D printing raw material and a 3D printing method and 3D printing product adopting the same. The printing raw material comprises a plurality of block units, wherein a materialof one random block unit is a fiber reinforced thermoplastic resin material. The method comprises: S1, preparing the 3D printing raw material, which comprises: using the block units as 3D printing units, and according to slice analysis of a to-be-printed component, obtaining the block units which need to be used by each printing layer; forming the blocking units of each printing layer; and coating the surfaces of all the formed block units with an adhesive or arranging welding lines on the surfaces of all the block units; S2, according to the obtained block units of each printing layer, sequentially printing each printing layer layer by layer, and carrying out adhesion connection by the adhesive or carrying out welding connection by the welding lines among the printing layers. The invention can solve the technical problems that when a continuous fiber reinforced material is adopted to prepare the 3D printing product currently, the obtained product is poor in mechanical property and for a large product, a printing speed is low.

The invention provides a 3D printing device using a block unit, and the block unit is made of fiber reinforced thermoplastic resin. The 3D printing device comprises a first bracket, a driving part, aconveying pipe, a first pair of rotary roller assemblies and a second pair of rotary roller assemblies, wherein the first bracket has a first operating state of a reciprocating motion in a horizontaldirection and a second operating state of a reciprocating motion in a vertical direction by virtue of the driving part; the conveying pipe is arranged on the first bracket and is used for conveying the block unit; the first pair of rotary roller assemblies are arranged on the first bracket and below the conveying pipe and are used for conveying the block unit output by the conveying pipe below; and the second pair of rotary roller assemblies are arranged on the first bracket and below the first pair of rotary roller assemblies and are used for outputting the block unit output by the first pairof rotary roller assemblies to a pre-printed surface and applying pressure in a Z direction. According to the 3D printing device, the technical problems of poor mechanical properties of 3D printing workpieces prepared from continuous fiber reinforced materials and low printing speed of large workpieces at present can be solved.

The invention discloses a reversible dynamic macroporous elastomer polymer material and a preparation method and applications thereof. A polymerizable precursor (or a crosslinkable polymer precursor)and a template liquid that is insoluble in the precursor are mixed and evenly stirred, and the prepared emulsion is cured to obtain the reversible dynamic macroporous elastomer polymer material. The synthesis technology is simple, green, and environmentally friendly, is easy to perform and popularize, and has a high yield and a low preparation cost. The reversible dynamic macroporous elastomer polymer material has an adjustable reversible multilayer porous structure, has a good convertible sunlight reflection performance, an infrared irradiation performance, a strong liquid storage performance, and adjustable surface roughness, belongs to macroporous polymer materials, and has a wide application prospect in fields such as radiation refrigeration, solar heating, intelligent interface, and the like.

The invention discloses a system for treating waste incineration waste gas. The system comprises an inert gas storage tank, a pressurizing pump, a flame-retardant machine, a thermal ionization chamber with a wall plate made of a heat-insulating material, a 1# electrode, a movable wall plate, a spray nozzle, a cooling system, a plasma reaction chamber, a 2# electrode, a vacuum-pumping device, a heat exchanger, a waste incineration furnace, a pure water slot, a water pump and the like. The waste gas generated by the waste incineration furnace in the system is not required to cooled after being discharged, so that the high-temperature waste gas can provide energy for the reaction through the heat exchanger; through dual effects of ozone molecules and pressurization, the system can generate thermal ionization reaction at a temperature of 800-1000 DEG C, so that the thermal ionization reaction temperature is greatly reduced and the energy consumption is reduced; the thermal ionization chamber of the system is adjustable in size, and a flow range of treated waste gas can be increased to 80000-15000 m<3> / h by adopting a gas compression method, and treatment needs for waste gas of a common waste incineration plant can be met.

A municipal solid waste treatment device, according to the present invention, comprises: a crushing unit which tears municipal solid waste and selectively pulverizes organic matter; a selection unit for classifying and selecting the municipal solid waste discharged from the crushing unit; a reaction unit for bio-drying the classified and selected municipal solid waste; a return unit which returns the bio-dried municipal solid waste to the crushing unit so as to increase a selectivity rate; and a recycling unit for recycling the remaining organic matter and combustibles, wherein the crushing unit is a rotary drum-type crusher for naturally and selectively pulverizing only the organic matter without using force, thereby enabling high-purity selection with minimum energy consumption, and the crushing unit adjusts a moisture content by using the organic matter dried in the reaction unit at the rear end part whereby a higher selection efficiency can be obtained, and the reaction unit at the rear end part is a bio-drying device for carrying out a drying process in a short time without using external drying energy.

The invention belongs to the technical field of a macromolecular material, particularly relates to anti-static / conductive polyimide resin, and further discloses a preparation method and application ofthe anti-static / conductive polyimide resin. The anti-static / conductive polyimide resin uses ODA, PDA, DPTP, PMDA and ODPA as polymerization monomers for stepped polymerization; a macromolecular longchain five-component copolymer is formed; the termination is performed by a terminating agent; optional special nanometer materials and ultrafine filling materials are added for enhancing the resin; the prepared ODA / PDA / DPTP-PMDA / ODPA five-component copolyimide resin has the advantages of good wear resistance, heat deformation resistance and chemical resistance performance; good anti-static / conductive characteristics can be realized; the resin can be applied to the high-tech fields of special electronics, electric appliances, semiconductors, special industries and the like.

The invention belongs to the field of preparation of heterogeneous materials, and particularly relates to a method for preparing a heterogeneous material through plasma cladding. The method includes the four procedures of pre-treatment, bottom layer cladding, multi-layer cladding and solution treatment and aging precipitation, and comprises the specific steps that plasma cladding is utilized, a high-strength material B is cladded on a high-toughness material A matrix, then the high-toughness material A is cladded on a high-strength material B matrix, the above operation is repeated according to a specific lap joint and stacking mode, finally the heterogeneous material controllable and devisable in a three-dimensional direction is obtained through solid treatment and aging precipitation, and finally high strength and high toughness of the material are achieved. According to the method, the multi-layer complex heterogeneous composite material is prepared through the plasma cladding process and solid treatment and aging precipitation, so that impurity doping and interfacial oxidation are effectively avoided, industrial production is easy, the applicable raw material range is wide, cladding patterns and shapes are diversified, and a heterogeneous structure is controllable and devisable in the three-dimensional direction.

The diluting liquid (water) is supplied via a flexible outlet hose (64) which is secured only at its upper end (66), whilst a magnetic object (82) is provided on the outside of its lower end (74). The magnetic object is surrounded by an electromagnet device (50) capable of generating a variable magnetic field which can travel around the hose mouth (84) so that the jet of liquid exiting the hose is moved around the inside of the mixing vessel in which the liquid is mixed with the remaining powdered and / or liquid ingredients. Liquid is delivered to the mixing vessel from above via a stirring device in the form of a spray head that directs at least one jet of liquid into the vessel.

The invention discloses an inverted V-shaped plate sedimentation device which is a device for sedimentating and separating solid particles in liquid. The inverted V-shaped plate sedimentation device consists of a water basin, and inverted V-shaped plates, sealing plates, edge beams, ridges, ridge brackets, a sludge discharging pipe, a water inlet pipe, a water outlet pipe and the like which are arranged in the water basin, wherein a plurality of layers of horizontally stacked inverted V-shaped plates are adopted; liquid flows among the inverted V-shaped plates; the solid particles are sedimentated on the surfaces of the inverted V-shaped plates and downwards slide laterally so as to realize solid-liquid separation; the liquid horizontally flows along the longitudinal direction, and the sedimentated solid particles downwards slide transversely and stay in sludge sedimentation channels for sedimentation; the solid particles and the sludge sedimentation channels are not interfered, so that the sedimentation effect is good; water inlet and outlet buffering regions are greatly reduced; the volume utilization efficiency of the basin body is high, and the water basin is small in size; the inverted V-shaped plates are simple in structure; the number of stacking layers can be randomly adjusted, and the inverted V-shaped plates are easily connected with front and back buildings.

The invention discloses a magnetic liquid micro-pressure difference sensor of a composite magnetic core, comprising a sensor main body and a bridge circuit portion; the sensor main body comprises two identical parts, wherein each part comprises an organic glass tube, a rubber plug, a coil, an annular permanent magnet, a composite magnetic core and a magnetic liquid; the organic glass tube comprises a large diameter portion and a small diameter portion; a rubber plug is plugged into the top end of the large diameter portion on the top, the composite magnet core is arranged on the inner side of the middle portion, and a coil is wounded on the outer side of the lower end; two ends of the composite magnet core absorb the magnetic liquid in a saturation manner; the annular permanent magnet sleeve the small diameter portion on the lower part; the bottom end of the small diameter is connected to a flexible tube which communicates with the two portions of the sensor main body; and the composite magnet core comprises a magnet core, a first permanent magnet and a second permanent. The invention can measure the air pressure difference in the vertical direction and output the evident electric signals. The distance between the two ports for measuring the air pressure difference is adjustable and the cost can be dramatically reduced.