216results about How to "With noise reduction" patented technology

The invention discloses a manufacturing method of environment-friend composite ceramic permeable brick, which comprises the following steps: adopting industrial slag with combustible substance as bottom aggregate and waste ceramic particle as layer aggregate, sieving at 10-20 order to obtain 55-65% material, sieving at 20-30 order to obtain 35-45% material, adding high-temperature adhesive and organic adhesive CMC, allocating, aging, moulding, drying, sintering.

The invention discloses a new type solid wall paper, its manufacturing method and application. Its feature is that pulpwood formed three-dimensional bass-relief pattern and colorful plate type is used to form the solid wall paper which has various design and color, geometry by monomer jointing, assembling, and arranging. The method includes the following steps: adding solid filling and additive, or any one of wood pulp, bamboo pulp, or their mixture into paper making pure wool pulp; using pulp molding plant and die to product; pulping; forming; drying; shaping; ginning; scratching; brush coating or surface overlaying film to obtain the solid wall paper. It can be used in the decoration for bedroom, drawing room, and public occasion.

The invention belongs to the technical field of functional concrete, and relates to a concrete material having a function of purifying gas-solid pollutants. The concrete material is characterized by being prepared from the components of cement, fine aggregate, coarse aggregate, water, water reducing agent, photocatalyst, an alkali solution and retarder, wherein the cement is 260-530 kg / m<3>, the silica fume content is 0-10 wt% of the cement content, the fly ash content is 0-25 wt% of the cement content, and the slag content is 0-40 wt% of the cement content; the coarse aggregate is 255-850 kg / m<3>, and the sand ratio is 30-45%; the water is 155-220 kg / m<3>; the mixing amount of the water reducing agent accounts for 0.5-1.2% of the total weight of the cement; the photocatalyst is 5-25 g / m<2>; the retarder content accounts for 0.01-1.0% of the weight of the cement to be removed on the surface layer of the concrete; the photocatalyst is put into the alkali solution to prepare a mixture; and the concentration of the photocatalyst is 1-5 g / L. The concrete material prepared by the method has a function of purifying gas-solid pollutants.

The invention relates to super-hydrophobic self-cleaning paint suitable to be used in various surfaces. The paint comprises the following components: 100 portions of filler, 30 to 50 portions of polyurethane, 300 to 500 portions of mixed solvent and 1 to 5 portions of Gamma-aminopropyltrimethoxysilane. The invented paint has the advantages of super-hydrophoby, self cleaning, antifouling, antisticking, denoise and drag reduction, etc.; meanwhile, the paint has low price cost, convenient construction and less environmental pollution.

The invention discloses a cement-based adhesive which consists of an inorganic gel, elasticity modulus filler, sand and a dry-mixed mortar additive, wherein the mass percentages of the various components in the adhesive are as follows: 35-45% of inorganic gel, 15-30% of elasticity modulus filler, 17-47% of sand, 3-8% of dry-mixed mortar additive and the balance of water. The cement-based adhesive disclosed by the invention has the following beneficial effects that by adding the low elasticity modulus filler which has the advantages of good elasticity, shock-proofing, sound insulation and the like, the cement-based adhesive has the characteristics of shock absorbing, noise reduction and the like, so that a problem of noise generated from the collision of ceramic tiles in a public place is relieved; in addition, the cement-based adhesive provided by the invention also solves the problems of low compressive strength, low bonding strength and the like of the adhesive after the low-modulus filler is added; shearing strength on the interfaces of the ceramic tiles caused by heat expansion and cold contraction is reduced and the bonding durability of the ceramic tiles on the basis of shock absorbing and noise reduction is improved; therefore, the cement-based adhesive is quite high in promotional value.

The invention provides a superhydrophobic acrylic resin paint. The paint comprises a nanoparticle, an acrylic resin, a mixed solvent, and heptadecafluoro trimethoxy ethoxy silane, wherein the ratio of the nanoparticle to the acrylic resin to the mixed solvent to heptadecafluoro trimethoxy ethoxy silane is 100:20-60:20-600:3-10. When the paint is sprayed on the surface of a solid, the contact angle of water drops on the surface is 150-160DEG, and the roll angle of the water drops on the surface is less than 10DEG. The superhydrophobic acrylic resin paint of the invention, which has the advantages of low cost, simple construction technology and small pollution to environment, has a good industrialized application prospect.

The invention relates to a three-dimensional pulp moulding decorating plate as well as a manufacturing method thereof by using a common pulp moulding device and a practical application thereof in the field of decoration. The height of the three-dimensional protruding part of the three-dimensional pulp moulding decorating plate ranges from 5mm to 150mm and the ordinary wallpaper is not as high as the protruding part. The three-dimensional pulp moulding decorating plate can be spliced and cut, and the wallpaper with the same specification and different patterns can be spliced into more patterns.

The invention discloses a rubber reinforced cement functional composite material and a preparation method thereof. The rubber reinforced cement functional composite material is prepared from waste rubber and cement or cement mortars by the following steps of: applying coupling adhesives to surfaces of waste rubber grains and / or powder by using coupling agents; mixing the waste rubber grains and / or powder with the cement or the cement mortars; adding water into the rubber-cement mixed materials for uniform stirring, and performing pavement, pressing, demoulding and maintaining to obtain the functional composite material product having a high mechanical strength and endurance. The composite material has the characteristics of noise reduction, sound isolation, high impact resistance, damping vibration attenuation, wear resistance, static resistance, water resistance and the like, has the advantages of insulation, environmental protection and the like and can be used in the field of functional materials, such as buildings, roads, railways, tunnels, noise barriers and the like. The functional composite material and the method thereof also provide a new way for solving the global problem of 'black pollution' of increasing waste tyres and have a wide application prospect.

The invention discloses a urethane foam composite board comprising panels and a composite core plate, wherein the two panels comprise an optically flat damping sheet and porous damping sheets, wherein one surface of the optically flat damping sheet is provided with a non-setting adhesive layer, and the porous damping sheets are arranged in a square or a triangle shape regularly; the composite core plate forms a single-side core plate by splicing one side of a perforated urethane forming board with the porous damping sheets; the single-side core plate and the optically flat damping sheets are foamed, cured and bound to be a multi-layer structure complex by A and B constituent urethane foam composite materials in a forming die, and the urethane foam composite board is obtained after deburring the multi-layer structure complex. The invention has the integrated function of damping, noise reduction, heat and sound insulation and sound absorption, and has simple preparation method and convenient installation and use, thereby being beneficial to popularization and application.

The invention discloses a device for evaluating the automobile exhaust degradation effect of an OGFC mixture. The device comprises a closed container, an automobile engine, an automobile exhaust analyzer, a track board test piece, and air supplying devices, wherein the air supplying devices are arranged in the closed container. The invention further discloses an evaluation method which comprises the following steps in sequence: preparing the track board test piece, and generating automobile exhaust; simulating the degradation of automobile exhaust on a pavement and testing the concentration of each gas in the automobile exhaust; processing data. The track board test piece is prepared from the OGFC mixture which is added with a photocatalytic material; the evaluation index, used for evaluating the automobile exhaust degradation effect, of the OGFC mixture is taken as the degradation rate. The evaluation device can simulate the automobile exhaust degradation processes of the OGFC mixture in different illumination conditions by controlling the number of ultraviolet lamp tubes. The evaluation method is accurate and reliable, and coincides with the automobile exhaust degradation situation on a real pavement.

A heat-preservation fireproof board is prepared by the following raw materials: 80-100 parts by weight of magnesium oxide, 2-3 parts by weight of dimethyl silicone oil, 4-6 parts by weight of aluminum nitride powder, 20-30 parts by weight of anhydrous magnesium chloride, 3-5 parts by weight of hollow glass beads, 8-12 parts by weight of tetrapod-shaped zinc oxide whiskers, 3-6 parts by weight of aerosil, 3-5 parts by weight of polyvinyl acetate emulsion, 20-30 parts by weight of refractory materials, 3-6 parts by weight of rock wool, 3-5 parts by weight of methylisothiazolinone, 2-4 parts by weight of ferriferrous oxide, 5-8 parts by weight of methyl sodium silicate, 1-2 parts by weight of sodium dodecyl benzene sulfonate, and 130-150 parts by weight of water. By virtue of adding the multiple types of refractory materials, the board can be high in burning point and good in flame retardation effect; and with the addition of the fly ash hollow beads, the board can be good in heat insulation effect and fine in fireproof effect. In brief, the board of the invention is a novel inorganic heat-preservation and heat-insulation building material integrating characteristics of heat preservation, heat insulation, high strength, fire prevention, water proofing, sound absorption, sound insulation, and decoration.

The invention discloses decorative wall material diatom ooze. The decorative wall material diatom ooze is prepared from the following raw materials: 325-mesh kieselguhr, 325-mesh talcum powder, a plant coagulant, white cement 325#, hydroxyethylmethylcellulose (HEMC), negative ion powder, a nano-photocatalyst, lignocelluloses, strain cellulose, 200-mesh coarse whiting, a dry powder defoaming agent, a dry powder retarder, titanium dioxide, mica powder, inorganic bentonite, 80 to 120-mesh snowflake white, multifunctional powder, a water reducing agent, gluconic acid sodium salt, attapulgite and bamboo charcoal powder. The decorative wall material diatom ooze is low in cost, the elimination rate and dissolution rate to formaldehyde dissociated in indoor air reach up to not less than 96 percent, and European standards and national standards are completely met; the decorative wall material diatom ooze not only has the efficacies of preventing fire and retarding inflaming, removing odor, adjusting indoor humidity and disinfecting, reducing noise and sound, insulating and saving energy, improving sleep, cleaning trash and self-cleaning and the like, but also can enable the humidity of air to be kept between 40 to 60 DEG C, the heat-insulating property of the decorative wall material diatom ooze is 2 times or above that of a current diatom ooze coating, 3400 negative oxygen ions or above can be released every second from each square centimeter, far infrared rays also can be released, and the decorative wall material diatom ooze has a healthcare function on a human body.

The invention discloses a preparation method of a polyurethane pervaporation phenol / water separating membrane compounded by inorganic particles, and belongs to the field of pervaporation membrane separation. The polyurethane membrane basic material is obtained by polymerizing and mixing monomer hydroxyl-terminated polybutadiene, toluene diisocynate, 4,4'-diamine diphenylmethane solution, cyclodextrin and silica or carbon fiber powder. The preparation method comprises the following steps: reacting hydroxyl-terminated polybutadiene with toluene diisocynate to obtain blocked prepolymer, then adding 4,4'-diamine diphenylmethane solution and cyclodextrin as chain extenders to perform the chain extension, and adding inorganic modified particle silica or carbon fiber powder (using N,N-dimethylacetamide as solvent) to obtain prepolymer solution of polyurethane; casting the solution on a polyfluortetraethylene plate to form a membrane, solidifying for 1-1.5 hours at room temperature, and moving the membrane to an oven at 80 DEG C to thermally treat to obtain the polyurethane membrane compounded by inorganic particles. The preparation method disclosed by the invention is simple in process, and the prepared membrane has good heat and chemical stability and mechanical property.

The invention discloses a high-precision frequency and phase discrimination signal processing method and device in laser offset frequency locking. The method comprises the steps: enabling tunable laser and a femtosecond optical frequency comb to pass through a beat frequency signal detection unit to obtain a beat frequency signal, performing analog-digital sampling on the beat frequency signal andthen enabling the signal to enter an FPGA development board for frequency and phase discrimination processing; multiplying the beat frequency signal by a reference signal and carrying out low-pass filtering; acquiring a corresponding phase through a coordinate rotation arithmetic unit; performing scaling processing on a phase after phase unwrapping, outputting an error voltage signal to an analogPID controller through a digital-to-analog converter, enabling the analog PID controller to generate a control signal to the tunable laser for closed-loop control, locking the frequency of a beat frequency signal to a reference signal, and calculating the signal-to-noise ratio, the frequency and the amplitude of the beat frequency signal. The invention solves the problems of difficulty in improving the frequency and phase discrimination precision of the beat frequency signal and small capture range in the offset frequency locking technology of locking the laser to the optical frequency comb,and can be widely applied to the field of laser precision measurement.

The invention relates to a hemp fiber doped asbestine organic group free saloon car brake pad. The brake pad has the characteristics of stable friction coefficient, strong heat decay resistance, small abrasion rate, small vibration noise, low cost and the like, and is environmentally-friendly. According to the invention, the hemp fiber is subjected to combined treatment of microwave, ultrasonic wave and laser, and the hemp fiber is subjected to alkaline treatment before microwave treatment, thus on the basis of maintaining the advantages of the hemp fiber, the flexibility of the hemp fiber isenlarged, the friction property and heat resistance of the hemp fiber are improved, and the cohesiveness of the hemp fiber is improved. The invention also provides a preparation process of a saloon car brake pad.

The invention discloses an assembly type plant wall provided with an air purifying system and integrated with a building. The assembly type plant wall comprises a supporting portion, a waterproof root expelling portion, a water supply and drainage portion and a plant cultivating portion, wherein the waterproof root expelling portion is arranged on the supporting portion, the water supply and drainage portion and the plant cultivating portion are arranged on the surface of the waterproof root expelling portion, and the water supply and drainage portion provides irrigation and drainage for the plant cultivating portion; the assembly type plant wall also comprises an air collection portion which is used for conveying air purified by the plant cultivating portion into a room. The plant wall provided by the invention adopts the industrially produced aluminum profile component as the main body, and is assembled on the spot; the supporting portion, the waterproof root expelling portion, the water supply and drainage portion and the plant cultivating portion are integrated in the system; the assembly type plant wall can be integrally designed and constructed with the building, is good in system integrality, wide in plant root distribution and strong in stress resistance, and has the functions of preserving heat, insulating heat and sound, and reducing noise.

The invention discloses a high-water-permeability environment-friendly water-permeable brick produced by utilizing industrial residues, and belongs to the technical field of construction materials. The water permeable brick comprises a surface layer and a bottom layer, wherein the bottom layer is prepared from the following components in percentage by mass: 30-40 percent of fine-sand and pulverized fuel ash particles, 25-35 percent of dump slag, 10-20 percent of a concrete stone material and 15-25 percent of cement; the surface layer is prepared from the following components in percentage by mass: 15-20 percent of cement, 60-70 percent of quartz sands and 15-20 percent of decorative stone particles; the fine-sand and pulverized fuel ash particles are prepared from the following components in percentage by mass: 70-80 percent of pulverized fuel ash, 10-20 percent of fine sands, 0.1-0.15 percent of water glass and 5-10 percent of cement; and the grain diameters of the fine-sand pulverized fuel ash particles and concrete stone material are 2-4mm. The invention further provides a preparation method of the high-water-permeability environment-friendly water-permeable brick. The high-water-permeability environment-friendly water-permeable brick has the advantages of strong water permeability, good moisture retention, sliding prevention, high strength, cold resistance, weathering tolerance, noise reduction, sound absorption and the like.

The invention discloses a switch reluctance motor direct servo driving new pump control hydraulic transmission system. It contains hydraulic cylinder with piston in it. The characteristics of system are that, two ends of hydraulic cylinder connect to quantitative pump with pipe. The pump drives by switch reluctance motor, which realizes round trip motion of hydraulic cylinder by its normal-reverse transfer. Pipe connects to oil tank by fluid check valve and check valve. The invention using switch reluctance servo motor, prevent reduce throttle, overflow and unloading loss, improve efficiency motor and power factor. This is inextricable by other hydraulic speed control mode.

The invention relates to a porous cement concrete road which has an adhesive layer above the concrete, wherein above a cement concrete bottom layer 3, the invention mixes polymer and stuff uniformly, to form polymer mixture, then lays uniform the mixture mechanically or hand-operated on the bottom layer 3 to form an adhesive layer 2, then uses cement concrete mixer to mix uniformly cement, broken stone, sand and water to form porous cement concrete, mechanically lays porous cement concrete, flattens and presses the concrete mechanically or hand-operated to form a porous cement concrete face layer 1 to be adhered on the adhesive layer 2. The inventive cover structure has high strength, better anti-crack property, noise-reduction property or the like.

The invention discloses a novel composite material vehicle soleplate, which comprises surface plates (1) and a core material (2). The vehicle soleplate is characterized in that: the surface plate (1) is made of a fiber material, while the core material (2) is made of a light material; the surface plates (1) are arranged on the upper surface and the lower surface of the core material (2); and the surface plate (1) is glued with the core material (2) through the curing of resin. Moreover, the middle of the core material (2) can also be provided with a glass reinforced plastic pipe which can be a rectangular pipe (3) or a round pipe (4), thereby increasing the bearing capacity of the composite material vehicle soleplate. The composite material vehicle soleplate has light weight and can reduce the weight of a vehicle; meanwhile, the soleplate has excellent heat-preservation and heat-insulation performances, energy conservation and environmental protection; moreover, the soleplate also has better vibration-isolation and sound-insulation performances and can improve the riding comfort of a passenger. The novel composite material vehicle soleplate can be widely used as soleplates of various sedans, coaches and freight wagons.

The invention discloses a high-power container type diesel generating set. The high-power container type diesel generating set comprises an auxiliary container, a power container and a connecting metal flexible pipe which is arranged between the auxiliary container and the power container, wherein the power container comprises a machine room and an electric appliance room, the machine room is internally provided with a diesel engine, a main generator, a starting motor, a storage battery and a charger, and the electric appliance room is internally provided with a high-voltage cabinet, a grounding cabinet and a control cabinet; the top part of the auxiliary container is in an open type, and a box door is in a shutter type; and the connecting metal flexible pipe comprises large-caliber steel wire braiding flexible pipes and small-caliber steel wire braiding flexible pipes, two large-caliber steel wire braiding flexible pipes are connected by adopting a movable flange, and two small-caliber steel wire braiding flexible pipes are connected by adopting a quick-change connector. According to the high-power container type diesel generating set disclosed by the invention, the generator and an auxiliary unit are respectively arranged in the two box bodies, the two box bodies are connected by adopting the steel wire braiding flexible pipes, and thus the high-power container type diesel generating set can effectively adapt to places with large environmental temperature difference and strong sandstorm and has the characteristics of noise reduction, shock absorption, easiness in disassembling and hoisting and the like.

The invention provides an analog and digital mixed noise reduction system for active noise reduction. The system comprises a noise collection microphone, an analog filter, an AD converter, a digital converter, an ANC noise signal phase reverse unit, a DA converter and a player which are connected in order, the noise collection microphone is used for collecting a noise signal, and converting the noise signal into an analog electric signal; the analog filter receives the analog electric signal and performs the filtering processing on the analog electric signal; the AD converter receives the analog electric signal filtered by the analog filter, and converts the analog electric signal into a digital signal; the digital filter receives the digital signal and performing digital filtering processing; the ANC noise signal phase reverse unit performs phase reverse on the digital signal after being processed by the digital filter to obtain a digital elimination circuit; the DA converter convertsthe digital elimination signal into an electric signal; and the player plays the electric signal after being converted into the noise inverse-phase sound wave. The system provided by the invention can effectively perform flexible regulation on the active noise reduction on the basis of reducing the chip resource requirement.

The invention relates to a movable plant wall, in particular to a special movable plant wall for an external building wall, and aims to solve the problems that heat island phenomena in cities are caused and urban air pollution is increasingly serious due to small floor areas of greenbelts because of limited space of urban building groups and the greenbelts and central greenbelts are further from residential areas. A scheme I and a scheme II are included, the similarity between the schemes is that each of the schemes comprises a fixed frame, a plant planting wall assembly and a plurality of guide devices, the fixed frame is fixedly connected onto the external building wall, the plant planting wall assembly is arranged in the fixed frame and is in sliding fit with the fixed frame, the plurality of guide devices are arranged on the fixed frame, and the plant planting wall assembly is connected with an indoor wall through the plurality of guide devices; the difference between the schemes is that structures of the plant planting wall assemblies are different; a resident can irrigate plants through water guide plates in the scheme I, and the plant planting wall assembly can collect rainwater automatically and irrigation can be realized without watching in the scheme II. The movable plant wall system is applied to building groups.

The invention relates to a multifunctional phosphating solution and a preparation method and application thereof. The multifunctional phosphating solution comprises liquid A and liquid B and is characterized in that a ratio of the liquid A to the liquid B in the multifunctional phosphating solution is 1: 0.1-1. The liquid A comprises the following substances, by mass, 26 to 48 parts of diammonium phosphate, 0.9 to 12 parts of phosphoric acid with a concentration of 85%, 0.8 to 1.8 parts of metal powder, 0.6 to 1.4 parts of animal glue, 0.4 to 10 parts of calcined gypsum powder and 0.3 to 0.8 part of alum, with the balance being water. The liquid B comprises the following substances, by mass, 20 to 46 parts of zinc dihydrogen phosphate, 38 to 55 parts of zinc nitrate, 2 to 3.8 parts of sodium fluoride, 2 to 4 parts of zinc oxide and 2 to 6 parts of phosphoric acid with a concentration of 85%, with the balance being water. The multifunctional phosphating solution provided by the invention is composed of the liquid A and the liquid B, can realize removal of oil and rust at the same time and has the efficacy of rust protection, heat insulation, high temperature resistance, heat preservation, flame retardation, noise abatement, shock prevention, isolation, pollution cleaning and resistance to fire. The multifunctional phosphating solution has the following beneficial effects: a fast rust removal speed, great thickness of a formed film, long antirust time, etc.

The invention provides a urban road greenbelt LID (low impact development) bioretention trough construction method. The construction method sequentially comprises the following steps: excavating grooves and pits; installing a plastic product inspection well and a municipal pipe network connecting pipe; implementing concrete trench wall construction; paving sand on a basement; paving an impermeable membrane; paving and adding a pebble bed; installing an HDPE (high-density polyethylene) perforated pipe and filling the perforated pipe with pebbles; paving and illuminating a permeable geotextile on lower layer; adding and paving a sand filter bed; paving and illuminating a permeable geotextile on upper layer; installing curbs at two sides; implementing back-filling with a planting soil layer; installing rainwater grates and well coves and implementing construction of a gravel block belt; planting plants; and implementing cleaning as well as acceptance and inspection. According to the construction method provided by the invention, a conventional drainage mode, adopted by urban roads, of direct discharging at a source and centralizing at an end, is changed, and a problem on drainage is solved; meanwhile, by planting the rainwater-cultivated plants in the bioretention trough in normal times, rainwater is utilized; and a urban heat island effect is solved and effects of lighting urban and beautifying environment are achieved.

An automatic separator for the antiwear cast balls is composed of machine frame, prismatic drum and drive unit. After the linked cast balls with sprute are loaded in its drum, the drum is driven by motor to rotate while the collesion and friction take place between said cast balls to separate them from each other and grind their surfaces.

The invention discloses a hollow glass bead and polyurethane cooperated-modified unsaturated polyester composite material and a preparation method thereof. The composite material is prepared from the following ingredients in parts by weight: 100 parts of unsaturated polyester resin, 15-40 parts of hollow glass bead-polyurethane prepolymer, 5-10 parts of diluent styrene, 1.5-3 parts of initiator methylethyl ketone peroxide, 0.3-0.6 part of accelerant cobalt naphthenate and 0.3-0.6 part of antifoamer simethicone. The prepared composite material has good mechanical strength and toughness while the density is effectively lowered, and meanwhile, the composite material further has special properties such as heat insulation, heat preservation and silencing.

The invention belongs to the field of functional materials, and in particular relates to a material with the effects of insulating sound and reducing noise and a preparation method of the material. The invention provides the material with the effects of insulating sound and reducing noise. The material is prepared from a silicone rubber pyrolysis product, polycarbonate, a vulcanizing agent, silicon oxide, aluminum oxide, a foaming agent and a foaming aid; the material is loose and porous, can be used for effectively absorbing and scattering sound waves, has the effects of cushioning impact, insulating sound, eliminating noise and the like, and can be effectively applied to sound insulation and noise reduction of fields such as industry, military affairs, civil buildings and the like. The invention also provides the preparation method of the material with the effects of insulating sound and reducing noise. The method is simple and convenient in manufacturing technique and simple in process. According to the material and the preparation method disclosed by the invention, waste silicone rubber in waste insulator angle leftovers is used as a raw material of the silicone rubber pyrolysis product; no rare materials are used; the adopted raw materials are low in cost; besides, the problem of a way out for the waste silicone rubber is well solved, wastes are changed into valuables, and the production cost is reduced.

The invention relates to a blast furnace coal gas pressure reducing valve, which is used for a dry-method (wet method) dust removing system in the current ferrous metallurgy joint enterprises. The blast furnace coal gas pressure reducing valve comprises a valve body and a vale core, wherein the valve core is positioned in a cavity of the valve body; and flanges for connecting pipelines are respectively arranged at an inlet end and an outlet end of the valve body. The blast furnace coal gas pressure reducing valve is characterized in that the part close to the inlet end of the valve body on the valve body is an annular indent part; the valve core is a bipyramid; one end of the valve core is fixedly connected with one end of a first connecting rod; the other end part of the first connecting rod is hinged with one end part of a crankshaft of a crankshaft mechanism; one end of a rotating shaft of the crankshaft mechanism passes through a rotating shaft hole on the valve body and is positioned outside the valve body; the other end of the valve core is fixedly connected with one end of a sliding shaft; and the other end of the sliding shaft passes through a shaft sleeve which is positioned in the inlet end part of the valve body and is fixedly connected with the valve body through a supporting frame. The pressure reducing valve has the characteristics of noise reduction, pipeline vibration reduction and simple structure.