58results about How to "Solve Vibration Problems" patented technology

The invention discloses a method, a device, a medium and a program for forecasting noise of a water surface ship propeller based on excitation source reconstruction. The method comprises the following steps: firstly, determining vibration sensing point location distribution and sound field assessment point positions; determining the arrangement and size of a reconstruction source; obtaining vibration and sound transfer functions from the reconstruction source to the sound field assessment point, and numbering the functions in sequence; according to a transfer function invariance principle, establishing a propeller noise forecasting method based on a reconstructed excitation source; rapid prediction of the structural noise of the propeller shaft ship under multiple reconstruction sources is realized; the direct sound production coherence of the propeller is judged, if the direct sound production coherence is strong coherence, correction continues to be carried out to obtain vibration sound transfer functions from the reconstruction source to the sound field assessment point, and numbering is carried out in sequence; if the signal is weak coherence, a direct sound production noise source model is established based on a sound-sound transfer function, radiation noise under direct sound production of the propeller is obtained through calculation, and prediction of the propeller noise considering direct sound production is achieved based on the vector superposition principle. The method is suitable for ship thruster shafting vibration monitoring and thruster noise rapid forecasting and evaluation.

The utility model relates to the technical field of plastic processing, and discloses a plastic bottle piece dewatering and spin-drying machine which comprises a barrel body, a supporting disc is arranged in the barrel body, and a shock absorption mechanism is arranged in the barrel body. The shock-proof mechanism comprises first hinge frames, connecting rods, first springs and second hinge frames, the tops of the two first hinge frames are fixedly connected with the bottom wall of the supporting disc, and the interiors of the two first hinge frames are rotationally connected with connecting blocks. Through the arrangement of the shock-proof mechanism, the problems that large vibration and noise can be generated when a machine runs, so that equipment is unstable in the running process, and the requirements for repair and maintenance are increased can be solved, the first hinge frame is driven to slide up and down through the generated vibration, and the service life of the first hinge frame is prolonged. Therefore, large vibration and noise generated during operation of the machine are effectively reduced, stable operation of the equipment is guaranteed, the product quality is improved, and the maintenance cost is reduced.

The Mecanum wheel with the damping function comprises a rim used for installing a double-layer roller set, the rim is installed on a hub, and the rim comprises an inner-layer roller installation frame, a middle-layer roller installation frame and an outer-layer roller installation frame which are arranged in parallel; a plurality of rollers are uniformly distributed and mounted between the inner-layer roller mounting frame and the middle-layer roller mounting frame in the circumferential direction to form an inner-layer roller group, a plurality of rollers are uniformly distributed and mounted between the middle-layer roller mounting frame and the outer-layer roller mounting frame in the circumferential direction to form an outer-layer roller group, and an elastic body layer is arranged on the periphery of each roller. According to the Mecanum wheel, vibration caused by the structure problem of the Mecanum wheel can be eliminated.

The utility model belongs to a foundation vibration isolation structure suitable for being adjacent to a subway basement in the field of civil engineering, and adopts the technical scheme that the foundation vibration isolation structure comprises double bottom plates and an anti-vibration pad, the double bottom plates comprise an upper bottom plate and a lower bottom plate, and the anti-vibration pad is arranged between the upper bottom plate and the lower bottom plate; the basement outer wall and the enclosure wall form double walls, the basement outer wall is connected with the upper bottom plate, the enclosure wall is connected with the lower bottom plate, and the anti-vibration pad extends upwards to be laid between the basement outer wall and the enclosure wall; the pile head of the uplift pile is fixedly embedded in the lower bottom plate; a waterproof layer is arranged below the anti-vibration pad, and the waterproof layer is arranged between the double bottom plates and the double walls; after construction of the uplift piles and the enclosure wall is completed, a cushion layer, a lower bottom plate, a waterproof layer, an anti-vibration pad, an upper bottom plate and a basement outer wall are sequentially formed from bottom to top. While the anti-floating and waterproof requirements of the basement foundation slab are met, the problem of environmental vibration caused by subway operation is solved, the use space in a building is not affected, and meanwhile the construction cost and the construction difficulty are low.

The invention discloses a precise hole lug piece and a manufacturing method of a high-edge-strip titanium alloy rib part, and relates to the technical field of forging. According to the specific technical scheme disclosed by the invention, the method comprises the steps of reaming a process hole, clamping a high-edge strip surface, roughly machining a part lug surface, roughly machining the part high-edge strip surface, naturally aging, semi-finishing the part lug surface, finishing the part lug surface, reaming a side wall precision hole of the part lug surface, semi-finishing the part high-edge strip surface, and finishing the part high-edge strip surface. And measuring the size of the part, and removing the process patch and the patch on the two sides. The machining method effectively solves the problem of machining precision holes in the side walls of the lug pieces of the parts, the problem of vibration of the high-edge-strip parts in the machining process and the problem of residual closed angles of the parts, meanwhile, deformation of the parts in the machining process can be controlled, and then the size and precision of the parts are guaranteed.

The invention discloses a fatigue endurance test device and test method for a fan bracket, and belongs to the technical field of fan bracket test. The device comprises a temperature control box assembly, a test piece mounting bottom plate assembly, an axial loading mechanism assembly, a base assembly, a radial loading mechanism assembly, a bending moment loading mechanism assembly and a motor assembly. The device can simulate the axial force, the radial force and the bending moment of the fan support in actual work, meanwhile, the environment temperature is adjustable and controllable, and a fatigue life test close to an actual working condition is carried out on the fan support. The device can also monitor and record the change data of the radial load, the axial load, the rotating speed and the bearing temperature of the test piece in real time. The structural design is optimized, the service life of the test device is prolonged, and the test reliability of the test device is improved.

The invention discloses a cascade water replenishing water electrolysis hydrogen production system and a control method. The system comprises a raw material water circulation loop, a water storage tank gas inlet pipeline, an oxygen separator water replenishing pipeline, a water storage tank gas exhaust pipeline and a water storage tank water replenishing pipeline. An oxygen separator is arranged in the raw material water circulation loop, the exhaust end of the oxygen separator is connected with the gas inlet end of the water storage tank through a gas inlet pipeline of the water storage tank, and the water supplementing end of the oxygen separator is connected with the water outlet end of the water storage tank through a water supplementing pipeline of the oxygen separator; the exhaust end of the water storage tank is connected with a water storage tank exhaust pipeline, and the water replenishing end is connected with a water storage tank water replenishing pipeline; the spatial position of the water storage tank is higher than that of the oxygen separator, and relative low-pressure water replenishing of the water storage tank and relative high-pressure water replenishing of the oxygen separator can be completed through valve linkage of the water storage tank air inlet pipeline, the oxygen separator water replenishing pipeline, the water storage tank exhaust pipeline and the water storage tank water replenishing pipeline. Therefore, cascade water replenishing of the raw material water circulation loop is achieved, and extra power input is not needed.

The utility model provides a three-phase hybrid stepping motor, which belongs to the technical field of motors, mainly aims at solving the problem that a traditional stepping motor is easy to generate torque fluctuation and vibration, and adopts the following technical scheme that the three-phase hybrid stepping motor comprises a base and a top cover, the base is connected with the top cover through a shell, and a mounting through cavity is arranged in the shell; a coil assembly is arranged in the mounting through cavity, a heat dissipation shell is arranged on the outer surface of the shell, a rotor is further arranged between the base and the top cover and located in the center of the coil assembly, rotating shafts are arranged at the top and the bottom of the rotor, an opening is formed in the top of the top cover, and one rotating shaft penetrates through the opening; through the arrangement of the coil assembly, the torque ripple can be reduced through the multiple sets of coils and the multiple sets of stators, through the arrangement of the two sets of stabilizing rings and the two sets of bearings, the motor vibration can be reduced, the problem that torque ripple and vibration are prone to occurring in a traditional stepping motor is solved, noise is reduced, and the service life of the motor is prolonged.

The invention relates to a self-resetting two-way colloid damper and an assembling method thereof, and belongs to the technical field of vibration control, the self-resetting two-way colloid damper comprises a piston connecting rod, a guide cylinder, an upper pressing plate, a cylinder body, a piston rod, an upper piston, a lower piston, a lower pressing plate, a piston rod limiting nut, a tail cylinder, a compression spring and working liquid with a porous lyophobic matrix, and the cylinder body is filled with the working liquid. The guide cylinder and the tail cylinder are respectively arranged at two ends of the cylinder body to form a cylinder body of the damper; an upper pressing plate is arranged on the side, close to the guide cylinder, in the cylinder of the damper, and a lower pressing plate is arranged on the side, close to the tail cylinder, in the cylinder of the damper. An upper piston and a lower piston are oppositely arranged on the inner side of the upper pressing plate and the inner side of the lower pressing plate correspondingly. A working liquid with a porous lyophobic matrix is filled between the upper piston and the lower piston; and the compression spring is sleeved on the piston rod between the upper piston and the lower piston. According to the invention, the problem of vibration control under normal use of constructional engineering and other dynamic systems can be solved, and the design of constructional engineering based on functionality and safety is realized.

The application provides a method for improving the performance of 35CrMo steel and application thereof. The method comprises the following steps: 1) heating 35CrMo steel to a first high temperature, carrying out first heat preservation, quenching, and obtaining quenched steel; 2) heating the quenched steel to a second high temperature, carrying out second heat preservation, and air cooling to obtain high-temperature tempered steel; 3) cooling the high-temperature tempered steel to a first low temperature, carrying out third heat preservation, and then increasing the temperature from the first low temperature to a second low temperature, and then decreasing the temperature from the second low temperature to the first low temperature, so as to form a cycle; then increasing the temperature from the first low temperature, and obtaining oscillation cycle cryogenic treated steel; 4) heating the oscillation cycle cryogenic treated steel to a third high temperature, carrying out fourth heat preservation, and air cooling to obtain cold and hot treated 35CrMo steel.

The application relates to a special clamp for surface treatment of an inverter copper piece, which comprises a base, a clamping unit, a flexible contact layer, a positioning pin assembly and a support adjusting mechanism. The clamping unit increases the contact area through adjustable clamping arms and the flexible contact layer, the positioning pin assembly reduces the impact force by using a spring buffer device, and the support adjusting mechanism provides uniform support through telescopic support rods. The application can effectively solve the problems of insufficient clamping area, uneven clamping force and insufficient support capacity of the existing clamp, avoid deformation or surface damage of the copper piece, ensure the uniformity of the surface treatment layer, simultaneously adopt a chemical corrosion resistant material, adapt to copper pieces of various shapes and sizes, and improve the applicability and treatment quality.

The utility model discloses a chassis type vibration reduction support for pipeline equipment, and belongs to the technical field of equipment vibration reduction. Comprising a base, the base is embedded into an on-site installation foundation, a vibration reduction assembly is installed on the base, a containing space is formed in the top of the vibration reduction assembly, a wedge-shaped balance element is installed above the vibration reduction assembly, the wedge-shaped balance element is partially inserted into the containing space of the vibration reduction assembly, and the wedge-shaped balance element is in surface contact with the vibration reduction assembly. A balance installation base is installed on the top face of the wedge-shaped balance element and used for installing pipeline equipment, after the pipeline equipment is installed on the balance installation base, vertically-downward pressure is applied to the balance installation base and the wedge-shaped balance element, and the wedge-shaped balance element abuts against the vibration reduction assembly. The vertically downward pressure is converted into the horizontal pressure through the vibration reduction assembly. The utility model effectively solves the vibration problem of the existing equipment and pipeline, thereby ensuring the safe and stable operation of the system.

The invention provides a magnetic suspension generator rotor vibration suppression device and method, and belongs to the technical field of magnetic suspension generators, and the device comprises an electromagnetic bearing, a passive magnetic bearing and a damper; the electromagnetic bearing comprises an iron core and two coil assemblies, the iron core is installed on the outer wall of the rotor, and the two coil assemblies are arranged around the iron core; the passive magnetic bearing comprises an inner-ring permanent magnet and an outer-ring permanent magnet, the inner-ring permanent magnet is mounted on the outer wall of the rotor, the outer-ring permanent magnet is mounted on the inner wall of the generator shell, and the two corresponding permanent magnets have the same magnetism; the damper is installed on the generator and provided with a damping body and a stress sensor, one end of the rotor is connected to the damping body, and one end of the damping body is connected to the stress sensor. According to the magnetic suspension generator rotor vibration suppression device provided by the invention, by virtue of the radial and axial targeted suppression design, the out-of-control galloping of the rotor caused by excessive vibration is effectively avoided, and the operation stability and safety of the generator are guaranteed.

This utility model relates to the field of high-voltage electrical system technology, and particularly to a DC copper busbar with single-phase conduction function, comprising: an input copper busbar, an output copper busbar, a power diode, and an insulating material; the input and output copper busbars are arranged in parallel, and the two copper busbars have an overlapping area in a direction perpendicular to the plane of the copper busbars, with a predetermined gap between the input and output copper busbars in the overlapping area; the power diode is disposed within the gap in the overlapping area of ​​the input and output copper busbars, and its two ends are electrically connected to the input and output copper busbars respectively; the insulating material fills the remaining gaps outside the power diode in the overlapping area of ​​the input and output copper busbars. This utility model solves the problems of high cost, reliance on manual operation, and complex structure of existing anti-reverse protection measures.

The present invention provides a finite element grid adaptive subdivision method for solving convection-based pollutant migration, which relates to the field of finite element numerical simulation technology, including: identifying convection-based finite element grids through a grid adaptive subdivision algorithm, and subdividing the convection-based finite element grids to obtain subdivided subunits; for each unsubdivided unit shared by an active edge, only the shared unit that needs to be subdivided into 4 subunits is subdivided to obtain subdivided subunits; for the units where all the remaining active edges are located, the remaining active edges are connected to the diagonal vertices of the remaining active edges to form 2 subdivided subunits. After the subdivided subunits are divided, the subdivided subunits have the same unit number as the parent unit, so that the subdivided subunits can reference the parameters of the parent unit. The present invention can effectively solve the problems of vibration of numerical solutions and large numerical dispersion in traditional numerical models when solving convection-based solute migration problems.

The utility model relates to mechanical processing technical field discloses a machine tool protection structure for protecting Y axis system, machine tool protection structure includes front end board, and front end board is installed on the workstation, and is located the processing table mobile route one end, rear end board is installed on the workstation, and is located the processing table mobile route other end, metal cover is along Y and is arranged in the processing table lower part, and one end of metal cover is installed in the front end board, and the other end is installed in the rear end board, third protective cover and fourth protective cover are two, and are all set up between the two sides of guide rail seat and corresponding side metal cover, one end of third protective cover is connected with the front end board, and the other end is connected with the processing table, one end of fourth protective cover is connected with the rear end board, and the other end is connected with the processing table. The utility model solves the technical problem that the interval exists between the protective cover side wall and Y axis system in the prior art, and part of pollutants enters Y axis system from the interval, resulting in the technical problem that machine tool precision reduces, equipment service life shortens.

The application provides a high-altitude simulation test cabin penetrating support structure, which specifically comprises a test cabin body, a cabin support assembly, an engine mounting rack and a rack support assembly. The test cabin body is installed on a factory building foundation through a plurality of cabin support assemblies. A rack concrete foundation is arranged on the factory building foundation below the test cabin body. The engine mounting rack is located in the test cabin body. A gap is maintained between the engine mounting rack and the test cabin body. The engine mounting rack is installed on the rack concrete foundation through a plurality of rack support assemblies penetrating the bottom of the test cabin body. A through hole is arranged in the sidewall of the bottom of the test cabin body for the rack support assembly to penetrate. A gap is arranged between the engine mounting rack and the test cabin body. A gap is arranged between the rack support assembly and the through hole. The edge of the through hole and the rack concrete foundation are sealingly connected through a sealing sleeve assembly. The safe operation of the test equipment is ensured, and the measurement accuracy of the engine performance parameters is ensured.

The utility model belongs to the technical field of soil wind erosion, disclose a kind of indoor small soil wind erosion experimental simulation device, the device includes test section, fusion section and contraction section, the one end of contraction section far from fusion section is first port, is provided with ventilation unit;The one end of contraction section close to fusion section is second port, is provided with rectifier net;Sample box is provided in the fusion section, for installing soil, the lower end surface of sample box and fusion section is abutted, the one end of test section far from fusion section is provided with baffle, test section, fusion section, contraction section and ventilation unit are fixedly connected by fitting mode, while guaranteeing the stability of the overall structure of device, greatly simplify the disassembly and assembly process, after experiment, device can be quickly and conveniently disassembled, each section inner wall is thoroughly cleaned, effectively solve the problem of inner wall cleaning difficulty, improve cleaning efficiency, ensure the cleanliness of device inside.

This invention discloses a stacker crane upper guide wheel device with shock absorption and noise reduction function, which solves the problem of how to overcome the vibration of the top clamping guide wheel of the stacker crane. A square shaft through hole (6) is provided on the left guide wheel mounting seat (4). A square shaft (7) with external thread at the top is connected in the square shaft through hole (6). A left rectangular V-shaped leaf spring (8) is connected to the square shaft. A left front wheel axle vertical connecting tube (10) is provided at the front end of the left rectangular V-shaped leaf spring (8). A left rear wheel axle vertical connecting tube (11) is provided at the rear end of the left rectangular V-shaped leaf spring (8). A left front vertical wheel axle (12) is fixedly connected in the left front wheel axle vertical connecting tube (10). A left front upper guide wheel (15) is connected at the upper end of the left front vertical wheel axle. A left front lower guide wheel (14) is connected at the lower end of the left front vertical wheel axle. This overcomes the vibration problem of the top guide wheel of the stacker crane caused by errors in the installation of the overhead rail and other factors.

The utility model designs a vibration-resistant cavitation-resistant double-suction pump, which comprises a double-suction pump and is characterized in that the double-suction pump is mounted on a base, first rib plates extending downwards are arranged below the front and rear surfaces of a middle opening surface of the double-suction pump, second rib plates extending downwards are arranged below the front and rear surfaces of a bearing mounting seat, and the first rib plates and the second rib plates are arranged on the base. The bottom ends of the first rib plates and the second rib plates on the two sides are connected with pump feet which are horizontally arranged, and mounting holes are formed in the pump feet; pump foot mounting plates are arranged on the two sides of the base, the pump foot mounting plates are connected to the surface of the base through pump foot vertical ribs, supporting ribs are arranged on the sides of the pump foot mounting plates, mounting threaded holes are formed in the pump foot mounting plates, and the mounting threaded holes correspond to mounting holes formed in pump feet in a one-to-one mode. And the pump foot of the double-suction pump is screwed in the mounting threaded hole in the pump foot mounting plate by a screw through the mounting hole in the pump foot. The utility model has the advantage that the installation height of the double suction pump is reduced. The center of mass is closer to the ground and is stable and vibration-proof; the net positive suction head of the device is increased, and pump cavitation conditions are improved.

The utility model discloses a food processor with a speed change function, which comprises a main machine assembly, the main machine assembly comprises a main motor, a planetary reduction gear and a clutch device, the planetary reduction gear comprises a shell, a sun gear, an inner gear ring and a planet carrier, the sun gear, the inner gear ring and the planet carrier are arranged in the shell, and a planet gear is mounted on the planet carrier and meshed with the inner gear ring and the sun gear respectively. The sun gear is connected with a motor shaft of the main motor; the clutch device comprises a clutch driver, an upper clutch assembly and a lower clutch assembly, the upper clutch assembly and the lower clutch assembly are arranged on the inner side of the shell and connected with the inner gear ring, and the clutch driver is used for driving the upper clutch assembly or the lower clutch assembly so that the inner gear ring and a motor shaft of the main motor can rotate together or be fixed to the shell; therefore, the planet carrier correspondingly outputs two rotating speeds. Compared with the prior art that a double-speed-change module and a double-selection module are arranged, the cost of the whole machine is reduced, clutch control is simpler, and speed reduction output is more reliable.

The present invention provides a load distribution method for a hydropower plant-level automatic power generation control system. A model prediction control unit is introduced into the hydropower plant-level automatic power generation control system. The model prediction control unit combines linear programming and control problems, and comprehensively considers the working water head, vibration swing, active load, efficiency index, number of crossing vibration zones, and cumulative adjustment times of the unit in the process of formulating the load distribution plan of the hydropower plant-level automatic power generation control system and selecting the best plan. It can solve the problem that the vibration and efficiency of the unit are often compromised due to the imperfect load distribution strategy in the prior art; and the problem that the program has a large amount of calculation and a long time consumption, resulting in slow load regulation response.

The present invention discloses a turbine impeller structure, comprising a hub and a plurality of blades fixed on the hub, characterized in that each of the blades comprises a blade body and a blade split, and a blade split is fixed on each blade body at the blade tip located at the blade inlet edge. Aiming at the problem of vibration and induced noise of turbine impeller blades of a cantilever structure of the same material, the present invention provides a turbine impeller structure of a cantilever structure. The turbine machine adopting the structure of the present invention has low vibration and low noise performance, and can reduce the vibration of the blades under the action of unsteady forces and the induced noise.

The invention discloses an optimization method for static gear shifting impact of an automatic transmission, and belongs to the technical field of automatic transmission control. The method comprises the steps that when a static gear shifting signal is triggered, the rotating speed of a turbine is monitored to obtain the actual fast charging duration and the actual pre-charging duration, the actual fast charging duration is the duration from the moment when static gear shifting is triggered to the moment when the rotating speed of the turbine changes, and the actual pre-charging duration is the duration from the moment when static gear shifting is triggered to the moment when the rotating speed of the turbine changes; the actual pre-charging duration is the duration from the moment when the rotating speed of the turbine changes to the moment when the rotating speed of the turbine is a target value; respectively calculating a first difference value between the actual fast charging duration and the target fast charging duration and a second difference value between the actual pre-charging duration and the target pre-charging duration; and according to whether the first difference value and the second difference value are respectively in a first preset difference value range and a second preset difference value range, carrying out self-learning adjustment on the rapid oil charging time and / or the pressure value of the pre-oil-charging KP point. The problem that obvious vibration and pause sense are generated in the static gear shifting process of the vehicle can be effectively solved.

The utility model discloses a motor reduction gearbox noise reduction device, including the shell, the one side outer wall fixed connection of shell output has the gasket, the inner wall fixed connection of gasket has the locating ring, gasket adopts soft glue material, the both sides of gasket are located in the locating ring. The gasket material in the middle of motor shell and locating ring changes to soft glue, and soft glue has the effect of absorbing vibration and reducing noise, ensures that the vibration and noise of motor are reduced when high -speed rotation of motor, because the volume of the ring and gasket is small, so save the space, reduce the cost, can solve the vibration and noise of motor gear reduction gearbox simultaneously fast.

The present invention discloses a vehicle steering wheel vibration optimization method, device, equipment and storage medium, belonging to the field of steering wheel control technology. During the vehicle braking process, the present invention obtains the current motor recovery torque of the vehicle; when the current motor recovery torque is greater than a preset motor recovery torque threshold, it is determined that the vehicle's steering wheel is vibrating, and the current engine speed is obtained; based on the current engine speed and the current motor recovery torque, the steering wheel vibration is optimized to avoid the problem of steering wheel vibration during braking, shorten the development cycle, and improve the performance of the whole vehicle in a time-saving and economical way.

The present invention relates to the field of design methods for RV reducers, core components of industrial robots, and discloses a vibration characteristic analysis method for RV reducers based on digitization. The method includes the following steps: constructing parameter values ​​based on an analytical calculation method, designing a parametric model based on a size optimization guidance and a three-dimensional intelligent design method, automatically assembling the RV reducer based on a computer-aided design method, and analyzing the vibration characteristics of RV reducer parts based on a numerical analysis method. Among them, the size optimization guidance method is used for the allocation and constraint of parameter values; the three-dimensional intelligent design method is used for program-driven modeling; the computer-aided design method is used for the automatic assembly of RV reducers; and the numerical analysis method is used for the vibration characteristic analysis of RV reducers. The numerical analysis method based on the parametric model of the present invention analyzes the vibration characteristics, which can predict the vibration characteristics of the system under different conditions, and is of great significance for evaluating system performance and preventing vibration problems.

The invention discloses a multifunctional indoor sports venue vibration reduction and sound insulation floating floor structure which comprises a structural floor layer, a first mortar leveling layer, an XPS extruded sheet, a second mortar leveling layer and a single-layer keel sports floor, the first mortar leveling layer is laid on the structural floor layer, the XPS extruded sheet is laid on the first mortar leveling layer, and the second mortar leveling layer is laid on the single-layer keel sports floor. The second mortar leveling layer is laid on the XPS extruded sheet, and the single-layer keel sports floor is laid on the second mortar leveling layer. The floating floor slab has the beneficial effects that the problems of floor slab vibration and secondary noise caused by basketball sports are solved in the mode that the XPS extruded sheet and the single-layer keel sports floor are arranged in a combined mode, the XPS extruded sheet is provided with a perfect closed-cell honeycomb mechanism, vibration generated by daily activities of people and basketball sports can be effectively isolated from the floor slab, and the service life of the floor slab is prolonged. Impact and vibration force on the floor are absorbed, vibration transmission is reduced, the vibration reduction effect is good, noise transmission can be effectively avoided, and the sound insulation performance is excellent.

The invention provides a pipeline noise reduction device and an air conditioner, the pipeline noise reduction device comprises a main body, the main body is provided with a cavity, one end of the main body is provided with a first pipe body, the other end of the main body is provided with a second pipe body, the first pipe body and the second pipe body are communicated with the cavity, the inner side wall of the main body is provided with an arc-shaped surface, and the inner side wall of the main body is provided with an arc-shaped groove; a damping piece is arranged on the main body, and the damping piece is arranged opposite to the center of the arc-shaped surface. According to the air conditioner, the technical problems that in the prior art, a pipeline noise reduction structure can affect the area of an airflow circulation channel, consequently, airflow circulation is poor, and the efficiency of the air conditioner is affected can be solved.

The invention belongs to the technical field of valves, and particularly relates to a swing check valve which comprises a valve body, a rotating part is rotationally assembled on the valve body through a rotating assembly, a valve clack assembly is rotationally assembled in the rotating part through a fixing disc, the valve clack assembly can adjust the limiting direction of the flow direction of a medium according to needs, and the swing check valve further comprises a limiting assembly used for limiting the rotating part. The valve clack assembly comprises a connecting rod, the connecting rod is rotationally assembled on one side of the fixing disc, a valve clack is fixedly assembled on the connecting rod through a fixing bolt, and a damping mechanism for providing damping for the valve clack assembly is arranged on the fixing disc. Compared with the prior art, the check valve has the advantages that the material cost is reduced, the occupied space of equipment is reduced, the adjustment process is convenient, the maintenance cost is reduced, the check valve has higher flexibility and expandability, the production efficiency of enterprises is also improved, and meanwhile the reliability of a pipeline system is greatly improved due to the arrangement of the damping mechanism.