69results about How to "Play a role in silencer" patented technology

The invention belongs to the field of air guns and particularly relates to an air cylinder type air pistol. The air cylinder type air pistol comprises a trigger mechanism, an air inlet device, an air outlet device, a loaded linkage mechanism, a sight device and a front sight device, wherein the air inlet device comprises an air cylinder, wherein the air cylinder is mounted in an air pipe through a locking sleeve, and the air outlet end of the air cylinder is connected with an air inlet structure; the air inlet structure comprises an air inlet valve, and a pricking pin is arranged in the air inlet valve; the air outlet device comprises a valve body component, one end of the valve body component is connected with the pricking pin, and the other end of the valve body component is abutted against an air outlet. The air cylinder type air pistol has the benefits that the operation is convenient, the structure is simple and practical, and a method for manually pressing air into an air chamber in the air gun during a shooting is eliminated.

The invention discloses a detonator delay time tester. The detonator delay time tester comprises a tester body, an explosion box arranged inside the tester body and a test box arranged on the tester body, wherein the explosion box comprises a box body, a box cover and a sensing system; a base is arranged at the bottom of the box body; the sensing system is connected with the test box; the box comprises a reinforced steel plate, an outer steel plate, a rubber layer and an inner steel plate which are sequentially arranged from outside to inside; an upper opening is formed in the top of the outer steel plate; an inner chamber used for storing to-be-tested detonators is defined by the encircling of the inner steel plate; a lower opening is formed in the top of the inner steel plate; a box cover comprises an outer box cover, an inner box cover, an outer box cover handle and an inner box cover handle; the outer box cover is arranged at the upper opening; the outer box cover handle is fixedly connected with the outer box cover; the inner box cover is arranged at the lower opening; the inner box cover is fixedly connected with the inner box cover. The detonator delay time tester is simple in structure and convenient to operate, and is capable of safely and accurately testing.

The invention relates to a PVC (polyvinyl chloride) silencing water drainage pipe and a production method thereof. The PVC silencing water drainage pipe is prepared from being prepared from the following raw materials in parts by weight: 80 to 100 parts of polyvinyl chloride resin, 100 to 130 parts of nano anhydrous calcium sulfate, 5 to 8 parts of a stabilizer, 2 to 5 parts of a modifier, 0.5 to2.0 parts of PE (polyethylene) wax, 0.5 to 2 parts of an aluminate coupling agent and 0.2 to 0.5 part of a compound antioxidant. The raw materials of the PVC silencing water drainage pipe are simple and easy to obtain, so that the PVC silencing water drainage pipe is low in cost, extremely high in aging resistance, flexibility, low-temperature resistance and high-temperature resistance; by the adding of a methyl methacrylate-butadiene-styrene copolymer, the PVC silencing water drainage pipe achieves a silencing effect; the low-temperature toughness and the impact resistance are improved; the PVC silencing water drainage pipe has a shock absorption function.

The invention provides a metal rubber honeycomb composite soft sandwich component preparation structure and a method thereof. The metal rubber honeycomb composite soft sandwich component preparation structure includes a vacuum brazing furnace and a tooling fixture, the tooling fixture comprises a base and a support fixed to the base, a pressure plate is arranged above the base, and the support ismatched with an adjusting bolt in a threaded mode. The designed metal soft sandwich structure part is metal skin, the middle layer is a metal honeycomb core, metal rubber is clamped between the metalskin and the middle layer metal honeycomb core, under complex dynamic load, the elastic porous metal rubber mainly has the effect of damping vibration reduction, and a metal honeycomb core structure in the middle plays the role of impact resistance and energy absorption; and in addition, the metal soft sandwich structure further has the structural characteristics of light weight structure, sound absorption and thermal protection and the like. The preparation device is used for realizing the metallurgical and solid interface combination of an interface of the metal soft sandwich structure partunder the vacuum hot pressing brazing technology, and the comprehensive mechanical properties and environmental adaptability of the whole structure part are improved.

The invention discloses an efficient parallel flow heat exchanger. The heat exchanger comprises an outer protection layer, connectors, heat dissipation fins, fin installation base plates, a cooling fluid outlet, a concentrated flow outlet, a concentrated flow inlet, a cooling fluid inlet and partition plates; flat pipes are connected to the left sides and the right sides of the connectors, cooling pipes are installed inside the flat pipes, and the flat pipes are arranged above the heat dissipation fins; concentrated flow pipes are arranged below the concentrated flow inlet; the connectors are fixed to the left sides and the right sides of the cooling pipes; and the concentrated flow pipes are connected to the exteriors of the partition plates. According to the efficient parallel flow heat exchanger, the multiple flat pipes are arranged, the cooling pipes are installed inside the flat pipes, the heat dissipation fins are installed below the flat pipes and are of a corrugated shape, and therefore heat of airflow in the flat pipes can be dissipated well and stably, and the heat dissipation effect is good; and the cooling pipes are uniformly distributed inside the flat pipes and are installed in symmetry relative to the concentrated flow pipes, the airflow in the flat pipes can be uniformly cooled, and therefore the cooling effect is good, and the heat exchange efficiency is high.

The invention relates to a lock comprising a locking mechanism having a rotary latch which consists at least to some extent of metal and which contains a load arm and a detent arm, the rotary latch being rotationally mounted on a rotary latch shaft and being adapted to accommodate a lock holding pin, the metal part of said load arm not entirely extending around the rotary latch shaft and being preferably open towards the lock holding pin in the main position of detent. Preferably, the load arm is designed in such a manner as to support itself on the lock wall when in the main detent position. The invention further relates to the use of a lock according to the invention in a motor vehicle.

This invention relates to a combined window that can be sliding. The sliding sash is consisted up by nine sections. 1) Section material is a. outline border group frame section material, b. sliding frame group frame section material, c. the sash group frame section material, d. screen window group frame section material, e. up bright window group frame section material. 2) The second section is face type hinge group frame, wheel, hitch angle and hinge group frame. 3) The third section is outline border group frame. 4) The fourth section is lock group. 5) The fifth section is sliding frame group frame. 6) The sixth section is horizontal open window sash group frame. 7) The seventh section is screen window group frame. 8) The eighth section is up bright window group frame. 9) The ninth section is clear wiper. The advantage is that many sliding on original down sliding is eliminated to make down window frame be plane and wipping is easy. It can be installed as an integer, and the installation is easy and simple, and transport is convenient. Consumer can exchange the glass, heat insulating ability is certainly raised. Window sash is opened inside the house, so it is safe and reliable, noise is little, daylighting and sealing effect is good, cost is low, and installation and using is convenient.

The invention discloses an air conditioning air deflector and a manufacturing method of the same. The air conditioning air deflector comprises an arc metal material lining, at least one layer of sound-insulation wind deflector outer layer is arranged on the outer surface of the metal material lining, a fastening component connected with the upper end of the sound-insulation air deflector outer layer is arranged at the upper edge of the inner surface of the metal material lining, a connecting component connected with the lower end of the sound-insulation air deflector outer layer is arranged at the lower edge of the inner surface of the metal material lining, and a middle connecting piece is arranged in the middle of the inner surface of the metal material lining. The sound-insulation air deflector outer layers are arranged on the surface of the metal material lining, so that when an air conditioner is started, sound reduction, sound attenuation and noise reduction functions are achieved; by the additional arrangement of the sound-insulation air deflector outer layers, connecting clearances of air deflectors and air conditioning parts are greatly reduced, and water drops generated under the action of heat conduction are reduced; the sound-insulation air deflector outer layers are tightly connected with the metal material lining, so that convenience in assembly is achieved, production cost is greatly lowered.

The invention discloses a strong heat dissipation waterproof cabinet, which comprises a main cabinet body, the lower part of the main cabinet body is fixedly connected with a rectangular heightening frame, the upper part of the rectangular heightening frame is provided with a plurality of layers of element mounting plates, and the cabinet is provided with the main cabinet body, and the left side and the right side of each element mounting plate are provided with waterproof composite baffle plates, so that a waterproof effect can be achieved; a temperature adjusting cabinet body is arranged on the upper portion of the main cabinet body, a refrigeration mechanism is arranged on the left side of a first heat conduction straight pipe, cold energy emitted by the refrigeration mechanism is supplied through the first heat conduction straight pipe and a first heat dissipation aluminum sheet, the effect of reducing the temperature in the cabinet is achieved, a heating pipe is fixedly connected to the upper side of the interior of the temperature adjusting cabinet body, and the effects of moisture prevention and dehumidification can be achieved; the graphene heat dissipation layer is arranged between the second heat dissipation aluminum sheet and the first heat dissipation aluminum sheet, the effect of accelerating heat dissipation can be achieved, and the composite shielding layer is bonded to the main cabinet body, so that the effect of shielding electromagnetic signals can be achieved, and external interference is prevented.

The invention relates to an exhaust recovery device, in particular to an exhaust recovery device of a rotary film type thermal deaerator. The exhaust recovery device comprises an exhaust pipe and a horizontal water tank connected with the exhaust pipe, a water inlet is formed in the top of the horizontal water tank, a water drainage port is formed in the bottom of the horizontal water tank, a silencer is arranged at the lower end inside the horizontal water tank, one side of the silencer is fixedly connected with the exhaust pipe, the other side of the silencer is connected with an exhaust port, an arc cover plate is arranged on the air inlet, and a negative pressure hole is formed in the arc cover plate. According to the exhaust recovery device of the rotary film type thermal deaerator with the technical scheme, noise reduction and waste steam recovery are achieved, and energy is saved.

The invention provides a silencer for a drum. The silencer is installed in the drum, a fixing plate is fixedly connected with the drum side wall, and a hole of which the hole diameter is larger than the diameter of a screw rod is reserved in the drum side wall and is used for allowing the screw rod to penetrate through; when silencing is needed, a nut block is gradually close to the fixing plate by regulating the screw rod end located outside the drum, the nut block drives a hinged plate, the hinged plate drives a hinged rod, the hinged rod drives a drum pad to be gradually buckled to the drum skin in an attached mode, and therefore the silencing function is achieved; when the silencing state needs to be released, the nut block is gradually away from the fixing plate by reversely regulating the screw rod end located outside the drum, the nut block drives the hinged plate, the hinged plate drives the hinged rod, the hinged rod drives the drum pad to be gradually separated from the drum skin, and therefore the silencing state is released. According to the silencer for the drum, the structure is reasonable, the occupied space in the drum is small, regulation is convenient while the better silencing effect is achieved, the influences on the tone quality of the drum are few, and the good practical value is achieved.

The invention relates to an automobile exhaust gas purifier. The automobile exhaust gas purifier includes a filtering box (1); the filtering box (1) includes a master pipe (2) positioned on the upper part and two branched slave pipes (5) positioned on the lower part; each slave pipe (5) is successively provided with an exhaust fine tube (4) and a ceramic cellular carrier (3) in the gas flow direction; a hush pipe (7) is arranged in the filtering box (1); and branch pipes (8) are arranged on the hush pipe (7), wherein holes are formed in walls of the branch pipes. According to the automobile exhaust gas purifier, tail gas is transformed into CO2, H2O, N2, and O2 through two-stage filtering of the exhaust fine tube and the ceramic cellular carrier; micro holes formed in partition walls can effectively filter carbon smoke particles in exhaust gas, the carbon smoke particles will be burned under the action of a catalyst coating, and the ceramic cellular carrier possess a regeneration function; the exhaust gas is distributed to the slave pipes from the master pipe, and then the filtering area is increased in a limited space; and the automobile exhaust gas purifier has a good silencing effect.

The invention relates to a tail gas filter with a good black smoke filtering effect. The tail gas filter comprises a filtering tank (1). A first filtering net (2), a first ceramic honeycomb carrier (3), a second ceramic honeycomb carrier (7) and a second filtering net (8) are sequentially arranged in the filtering tank (1) in the air flow direction. A silencing pipe (10) is arranged in the filtering tank (1). Branch pipes (11) with holes formed in the walls are arranged on the silencing pipe (10). According to the tail gas filter with the good black smoke filtering effect, tail gas with main components being CO, HC and NOx is reacted into CO2, H2O, N2 and O2 under four-stage filtration of the first filtering net, the first ceramic honeycomb carrier, the second ceramic honeycomb carrier and the second filtering net, meanwhile, black smoke particles in waste gas can be effectively filtered out through micro holes in a partition wall, the black smoke particles can be burned up under the action of a catalyst coating, and the tail gas purification effect is further improved; and meanwhile the filter is good in silencing effect.

The invention provides a pump body module and a compressor. The pump body module comprises a cylinder (1), a roller (2) and a slide piece (3); the roller (2) is rotationally arranged in the cylinder (1); the cylinder (1) is provided with a slide piece groove (4), an exhaust groove (5) and an air sucking port (6); the slide piece (3) is slidingly arranged in the slide piece groove (4); one end of the slide piece (3) butts against the periphery of the roller (2); a first silencing cavity (7) is formed in the side, towards the exhaust groove (5), of the slide piece (3); and in one rotating periodof the roller (2), the first silencing cavity (7) dose not communicate with the air sucking port (6). The pump body module can effectively prevent the silencing cavity from influencing the air sucking quantity of the compressor, and guarantees the working energy efficiency of the compressor.

The invention relates to a low-temperature-resistant and weathering-resistant PVC pipe and a production method thereof, wherein the raw materials comprise, by weight, 80-100 parts of a polyvinyl chloride resin, 10-20 parts of modified kaolin, 2-5 parts of a stabilizer, 1-3 parts of a modifier, 0.5-2 parts of PE wax, 0.5-1 part of a plasticizer, and 0.2-0.5 part of a compound antioxidant. Accordingto the present invention, by using the modified kaolin as the filler, the raw materials are simple and easy to obtain, and have the low cost; and by adding the admixture in a matched manner, the low-temperature resistance of the PVC pipe is greatly improved, and the obtained PVC pipe has advantages of good weathering resistance, good aging resistance and good impact resistance.

The invention discloses sound elimination enclosure plates and an enclosure system which can effectively reduce the noise hazard. The enclosure system comprises a building base, a plurality of supporting pieces fixedly connected with the building base and the sound elimination enclosure plates; the sound elimination enclosure plates comprise plate face parts, connecting fixing parts (3) and overlapping buckling parts (4), wherein the connecting fixing parts (3) and the overlapping buckling parts (4) are located on the two sides of the width directions of the plate face parts; the connecting fixing parts (3) are used for being fixedly connected with the supporting pieces; every two adjacent sound elimination enclosure plates are buckled on the connecting fixing parts (3) in an overlapping mode through the overlapping buckling parts (4) to achieve bolt-free overlapping buckle connection; and the plate face parts comprise convex strips (1) and grooves (2) which longitudinally penetrate through the length direction and are arranged / formed at intervals. When external sound passes through the sound elimination enclosure plates, the sound noise is subjected to reflection and refraction at the grooves (2), energy conversion is generated, sound waves are converted into mechanical energy and heat energy, the sound elimination effect is achieved, the length directions of arrangement of all the sound elimination enclosure plates are perpendicular to the supporting pieces, and the sound elimination enclosure plates and the enclosure system can be widely applied to the field of metal enclosure.

The invention relates to a tail gas filter with a good purifying effect. The tail gas filter comprises a filter box (1), wherein a first filter screen (2), a first ceramic honeycomb carrier (3), a second ceramic honeycomb carrier (7) and a second filter screen (8) are sequentially arranged in the filter box (1) in the gas flow direction, wherein a silencing tube (9) is arranged in the filter box (1); and a branch tube (10) with holes in wall is arranged on the silencing tube (9). According to the tail gas filter with good purifying effect, under four-stage filtration of the first filter screen, the first ceramic honeycomb carrier, the second ceramic honeycomb carrier and the second filter screen, tail gas comprising main components of CO, HC and NOx are converted into CO2, H2O, N2 and O2 through reaction; and meanwhile, micro holes in partition walls can effectively filter black smoke particles in waste gas, and the black smoke particles are combusted under the action of a catalyst coating, so that tail gas purifying effect is further improved; and meanwhile, the filter has a good silencing effect.

The invention relates to a cooling exhaust pipe. The cooling exhaust pipe comprises a purifier, a muffler and a gas guide pipe. A cooler is further connected between an engine and the purifier in series. The cooler is of a two-layer hollow pipe-shaped structure, an inner-layer pipe of the cooler is made of elastic materials, and an outer-layer pipe of the cooler is made of hard materials. An airtight annular-cylinder-shaped heat absorbing box is defined by the inner-layer pipe and the outer-layer pipe. The heat absorbing box is filled with cooling fluid. A fluid inlet hole and a fluid outlet hole which are communicated with the heat absorbing box and additionally provided with one-way valves are formed in the outer-layer pipe. The fluid inlet hole and the fluid outlet hole are provided with a fluid inlet pipe and a fluid outlet pipe respectively, and the fluid inlet pipe and the fluid outlet pipe are communicated with the two ends of a soft cooling box respectively. The exhaust pipe can quickly cool high-temperature tail gas, thereby effectively protecting the muffler and the purifier; meanwhile, liquefied water can be prevented from entering the muffler and the purifier, so the overall service life of the exhaust pipe is prolonged; besides, the exhaust pipe has an auxiliary muffling effect.

The invention discloses an air purification device. The air purification device comprises a case, wherein a main air inlet and a main air outlet are formed in the case; an air duct for communicating the main air inlet with the main air outlet is arranged on the case; an air purification chamber and a fan for providing suction power are arranged on an air duct route between the main air inlet and the main air outlet in the case; the air purification chamber comprises a front purification chamber located at the upstream of inlet air and a rear purification chamber located at the downstream of the inlet air; the front purification chamber and the rear purification chamber are separated by a partition plate; a dust filter device is detachably mounted on the partition plate; an ultraviolet lamp tube for disinfection and sterilization is also mounted in the front purification chamber; and the fan is located at the upstream of the dust filter device in the air direction. The air purification device can meet the requirement for large-air-volume air purification, has lower noise and is suitable for indoor use.

A rock sand crystal instead of lime or cement in mortar is prepared from emtrol sodium polyvinylsulfonate, sodium abietate, triisopropanol amine, polyacrylate, sodium sulfate and powdered coal ash.

The invention provides a heat dissipation device of an air blower and belongs to the technical field of fan devices. The problem that a motor of an existing air blower difficultly and effectively dissipates heat is solved. The air blower comprises an air barrel and a motor, wherein the motor is provided with a motor housing, the motor housing is fixedly connected with the air barrel, an air outlet pipe is connected to the air barrel, a branch pipe is fixedly connected to the air outlet pipe, one end of the branch pipe is communicated with the air outlet pipe, the other end of the branch pipe is communicated with the inner cavity of the motor housing, and a flow guide plate is rotatably connected in the air outlet pipe and is connected with an adjusting part. The heat dissipation device of the air blower can conduct timely and moderate heat dissipation and temperature reduction on the motor and is convenient to use.

The invention relates to the field of winding pipe cutting techniques, and discloses a cutting device for an enhanced polyethylene winding pipe. The driving end of a cutting motor is connected with arotating shaft, a cutting blade is fixedly connected with the front surface of the rotating shaft, a falling hole is formed in the upper surface of a workbench and located just below the cutting blade, a recycling box is installed below the workbench, a moving plate is slidably mounted on the upper surface of the workbench and located in front of the falling hole, and a protective cover is mountedon the upper surface of the workbench. Mounting pins are utilized to be embedded into mounting grooves, and the protective cover can be installed on the upper surface of the workbench, so that flyingchips generated in the cutting process can be shielded through the protective cover, and the phenomenon that because the flying chips are disordered, the environment is affected is prevented; and a first placing groove and a second placing groove formed in a first clamping block and a second clamping block are utilized, so that winding pipes with different sizes can be fixed, and loss caused by movement can be prevented.

The invention relates to a noise-reducing tail gas filter. The noise-reducing tail gas filter comprises a filter box (1), a fire extinguisher (7) and a silencer (8). A filter screen (2) and a ceramic honeycomb carrier (3) are arranged in the filter box (1), a silencing tube (9) is arranged in the filter box (1), and a branch tube (10) with holes on the wall is arranged on the silencing tube (9). According to the noise-reducing tail gas filter provided by the invention, firstly, under the action of the silencer and the fire extinguisher, noise is reduced and the fire is extinguished; then acidic components in the tail gas are eliminated by means of sodium carbonate water mist; and finally, under two-stage filtration of the filter screen and the ceramic honeycomb carrier, tail gas, the main components of which are CO, HC and NOx, is reacted to form CO2, H2O, N2 and O2, and meanwhile, micropores in the isolating walls can effectively filter black smoke particles which can be combusted under the action of a catalyst coating, so that the tail gas purifying effect is further improved; and meanwhile, the filter is good in silencing effect.

The invention discloses a detonator delay time tester. The detonator delay time tester comprises a tester body, an explosion box arranged inside the tester body and a test box arranged on the tester body, wherein the explosion box comprises a box body, a box cover and a sensing system; a base is arranged at the bottom of the box body; the sensing system is connected with the test box; the box comprises a reinforced steel plate, an outer steel plate, a rubber layer and an inner steel plate which are sequentially arranged from outside to inside; an upper opening is formed in the top of the outer steel plate; an inner chamber used for storing to-be-tested detonators is defined by the encircling of the inner steel plate; a lower opening is formed in the top of the inner steel plate; a box cover comprises an outer box cover, an inner box cover, an outer box cover handle and an inner box cover handle; the outer box cover is arranged at the upper opening; the outer box cover handle is fixedly connected with the outer box cover; the inner box cover is arranged at the lower opening; the inner box cover is fixedly connected with the inner box cover. The detonator delay time tester is simple in structure and convenient to operate, and is capable of safely and accurately testing.

The invention relates to an exhausted gas filter, which comprises a filter box (1). A purifier (2) and a ceramic honeycomb carrier (3) are arranged in the filter box (1), a hush pipe (7) is arranged in the filter box (1), and a branch pipe (8) with pores in the wall is arranged on the hush pipe (7). Through the two-stage filtration of the ceramic honeycomb carrier and the purifier, the exhausted gas filter makes the exhausted gas with CO, HC and NOx as major components react into CO2, H2O, N2 and O2, meanwhile, the micropores at the adjoining wall can effectively filter out black smoke particles in the exhausted gas, the black smoke particles are burned off under the effect of catalyst coating, and the effect of exhausted gas purification is further improved; meanwhile, the filter is good in noise reduction effect.

The invention discloses a thin-film mute micro-switch, which comprises a base, a cover, an elastic body, a connection sheet A, a gasket and a connection sheet B, wherein the cover covers the base to form an accommodating cavity; a guide core is arranged in the accommodating cavity; the base is provided with a first terminal and a second terminal; the elastic body is arranged in the accommodating cavity and located at the lower part of the guide core; the connection sheet A is arranged on the base and is in contact with the first terminal; the gasket is arranged on the connection sheet A; the connection sheet B is arranged on the gasket; a push part located at the upper part of the connection sheet B is convexly arranged at one end of the elastic body downwards; the connection sheet B is provided with a conductive layer; an upper through hole is formed in the gasket and below the conductive layer; a lower through hole is formed in the connection sheet A and below the conductive layer; the lower through hole is smaller than the upper through hole; and the upper end part of the second terminal extends into the lower through hole. The micro-switch disclosed by the invention is reasonable and novel in structural design and accurate in action in conduction and disconnection processes, has good hand feel, has a mute function and is long in service life, and the mute effect is achieved.

The invention discloses a noise-suppression edge grinding wheel which comprises a flange plate connected with a diamond tool bit substrate; a diamond tool bit is arranged on the diamond tool bit substrate; and a noise-suppression ring is arranged between the noise-suppression diamond tool bit substrate and the flange plate; a nylon noise-suppression ring, an aluminum noise-suppression ring or a copper noise-suppression ring is adopted as the noise-suppression ring; moreover, the noise-suppression ring is connected with the diamond tool bit substrate by a bolt. The noise-suppression ring is arranged between the diamond tool bit substrate and the flange plate; during grinding, when workpieces to be processed, such as ceramics, stone or glass are fed, the noise-suppression edge grinding wheel can play the effects of noise-suppression and buffer, can effectively reduce the noise and reduce the impact force when the diamond tool bit and the workpieces to be processed impact; therefore, damage of the workpieces to be processed can be reduced; the processing quality can be improved; and the service life of the edge grinding wheel can be prolonged. Meanwhile, the noise-suppression ring can play the roles of protecting a motor of a machining device to work stably, and prolonging the service life of the motor. The noise-suppression edge grinding wheel has the characteristics of low working noise, long service life, good machining quality, and broad sphere of application.

The invention belongs to the technical field of crop production, in particular to a corn ear weight grading compressed air nozzle opening. The corn ear weight grading compressed air nozzle opening comprises a first nozzle, wherein one end of the first nozzle is fixedly connected with a second nozzle, two air inlets which are distributed in parallel are formed in the middle of the outer surface ofthe front end of the first nozzle, a fixing block is fixedly connected between the two side-by-side air inlets, a partition baffle is fixedly mounted on the side wall of the middle part of an inner cavity of the second nozzle, and a noise reduction channel is arranged above the partition baffle and located in the inner cavity of the second nozzle. According to the corn ear weight grading compressed air nozzle opening, a plurality of compressed air passages are arranged in the second nozzle, so that airflow has a large speed when flowing through the nozzle, then the large impact force is obtained, and better work is facilitated; and a connecting plate is embedded in the inner layer of the second nozzle, the connecting plate is made of a high-strength alloy steel plate material, and the steel plate has high strength and hardness, so that the impact resistance of the second nozzle is improved.

The present invention relates to sewer pipe for building, and is especially silencing sewer pipe with soft inner layer. The silencing sewer pipe includes one outer layer of hard material and one inner layer of soft material, and the soft material can reduce the impact of water to pipe wall, reduce shock and silence. The silencing sewer pipe with soft inner layer may be used widely in buildings.