9results about How to "Noise reduction effect" patented technology

The present application discloses a control system for a 25°C ultra-low temperature and noise-reducing screw air source heat pump unit, comprising a fan control module, a PLC module, a communication module and an electronic expansion valve module, wherein the PLC module comprises a CPU unit, an analog quantity unit and an expansion module unit, and the communication module and the electronic expansion valve module are connected to the PLC module. The control system has the following advantages: the problem of excessive noise generated by the air source heat pump unit is solved, and the low noise effect of the air source heat pump unit during heating is achieved.

The utility model provides an expansion joint waterproof structure at a high-low-difference roof interface. The expansion joint waterproof structure comprises an expansion waterproof plate fixedly connected between a high-position outer wall surface and a low-span outer wall; the high outer wall surface is covered with a painting layer, a mounting notch is reserved in the painting layer, and the mounting notch is higher than the set height of the top of the low-span outer wall; and the telescopic waterproof plate is provided with a vertical part which is vertically embedded into the mounting notch, a water drip part which is bent to wrap the convex coping of the low-span outer wall, and an arc-shaped water guide part which is connected between the vertical part and the water drip part at a set radian. The telescopic waterproof plate is formed by integrally pressing the aluminum alloy plate with good plasticity, so that the corrosion resistance is improved, the service life is prolonged, and noise is reduced; and the telescopic waterproof plate has high telescopic protection performance, the qualified rate of the waterproof quality of the high-low-difference roof interface is increased, and the later maintenance cost is reduced.

The utility model discloses a sound insulation door, including door frame and door board, the door board with door frame rotatable connection, the door board is composite layer structure, from outside to inside is in proper order: panel, sound insulation heat preservation gasket, medium density fiberboard and fiber sound absorption board, the panel, sound insulation heat preservation gasket and medium density fiberboard symmetry setting in the both sides of fiber sound absorption board, the door board still includes multilayer damping glue for connecting each material layer. The utility model has beneficial effect in that, through setting up the door board as composite layer structure, has good sound insulation performance, light in weight, and conveniently opens and shuts.

This utility model relates to the field of laser scanning galvanometer technology, and in particular to a low-noise laser scanning galvanometer, comprising: a galvanometer body and a soundproof cover installed on the outside of the galvanometer body; the soundproof cover includes a main shell and a secondary shell, which are inserted into each other and fastened with bolts; wherein, sound-insulating cotton is installed on the inner surfaces of both the main shell and the secondary shell, and cooling structures are provided on both sides of the main shell. This utility model adopts a design of installing sound-insulating surfaces on the inner surfaces of both the main shell and the secondary shell to achieve sound insulation protection for the entire galvanometer body, thereby achieving a low-noise effect when the galvanometer body is working. At the same time, this application also installs a cooling structure on the outside of the main shell, so while reducing noise, it can also effectively ensure the heat dissipation stability of the internal galvanometer body during operation.

The utility model discloses a high-pressure automatic cleaning device. The high-pressure automatic cleaning device comprises an unpowered roller line, a high-pressure cleaning module, a lifting module and a 3D high-pressure cleaning module. And by arranging the unpowered roller line, direct contact between the IBC barrel and the ground is avoided according to the rolling friction principle, the carrying operation intensity is reduced, and the automation degree is high. By arranging the high-pressure cleaning module and arranging the sound insulation cotton on the periphery of the interior for wrapping, the significant noise reduction effect is achieved, people can leave by pressing down a start button, people do not need to get close to a sound source, and the safety performance is improved. By arranging the lifting module and the 3D high-pressure cleaning module, the lifting module drives the 3D high-pressure cleaning module to do lifting motion, the rotating sleeve can do rotating motion along the first rotating plane, the nozzle extension rod can do rotating motion along the second rotating plane, the three-dimensional all-dimensional (360-degree) cleaning function of the IBC barrel is finally achieved, the cleaning effect is good, and the cleaning efficiency is high.

The utility model discloses a low-noise occipital massage instrument, which belongs to the technical field of massage instruments and comprises a massage instrument sleeve, a protective cover and a massage mechanism for occipital massage, the massage mechanism is arranged in the protective cover, and sound-absorbing cotton is arranged on the inner side wall of the protective cover. According to the low-noise occipital massage instrument, due to the design of the protective covers, the sound-absorbing cotton, the shifting blocks and the springs, the two shifting blocks are moved oppositely, the upper protective cover and the lower protective cover are aligned and clamped, then the shifting blocks are loosened, under the elastic action of the springs, the mounting rods and the clamping blocks are clamped, the massage mechanisms are arranged in the protective covers, and under the action of the sound-absorbing cotton, the massage mechanisms can massage the occipital parts. According to the occipital massage device, noise generated by working of the massage mechanism can be absorbed and reduced, so that the occipital massage device is lower in noise, the comfort of the massage environment is improved, the situation that ear hair cells of the human body are stimulated, and the ear function is affected is avoided, meanwhile, the occipital massage device is convenient to disassemble and assemble in the mode, and the occipital massage device is convenient to maintain in the later period.

The present invention belongs to the auxiliary device of the bridge expansion device, and in particular refers to the application of a multi-directional displacement device for preventing tooth warping in a comb-tooth plate type expansion device. The multi-directional displacement device for preventing tooth warping includes a first fixed tooth plate fixed to the upper surface of the concrete structure on one side of the expansion joint by a first anchoring device, and a movable tooth plate mounted on the upper surface of the concrete structure on both sides of the expansion joint and having the inner side adapted to the tooth shape of the first fixed tooth plate; the side wall and the bottom of the self-resetting mechanism are buried in the concrete structure on the inner lower surface of the movable tooth plate, and also include a tooth plate pad, the upper surface of the tooth plate pad is attached to the movable tooth plate and the bottom surface of the first fixed tooth plate, and the top of the self-resetting mechanism passes through the tooth plate pad to cooperate with the lower part of the movable tooth plate and guides the sliding cooperation along the displacement direction of the movable tooth plate. The present invention solves the problems existing in the prior art that the tooth plate of the expansion device is easy to warp up and causes the tooth plate to be damaged. It has the advantages of effectively preventing the movable tooth plate from warping up, improving the stress condition of the movable tooth plate, and reducing the vibration and noise caused by displacement.

The utility model provides a noise reduction keyboard which comprises a keyboard key base and a key cap movably arranged on the top of the keyboard key base, a key cap shaft is fixedly installed at the center of the bottom of the key cap through a screw, and the bottom end of the key cap shaft penetrates through and extends into the keyboard key base. A positioning cylinder is fixedly mounted at the center of the top of the keyboard key base through a bolt, the keycap shaft movably penetrates through the center of the positioning cylinder, a positioning plate is fixedly mounted at the top end of the interior of the positioning cylinder on the keycap shaft through a screw, and a first spring is fixedly mounted at the center of one side of the bottom of the positioning plate through a bolt. The further buffering effect is achieved through the supporting plate and the second spring below the key cap shaft, the sound attenuation effect of the key cap in the keyboard key base is good, then the key cap enters the buffering base through the arc-shaped base block, the buffering and noise reduction effect is improved through the third spring below the buffering base, the structure is stable, noise is eliminated by reducing the noise layer by layer, and the service life of the key cap is prolonged. The buffering effect is stable and simple, and good noise reduction is achieved.

This utility model discloses a hydraulic oil tank for a hydraulic oil pump. The tank body has cross-sections formed at a set of diagonal sides, one of which has an oil suction port and the other has an oil return port. The oil suction port's pipe extends into the tank body and connects to a coarse filter. The coarse filter is connected to a funnel-shaped expansion suction head via a threaded connector. The oil return port's outlet is connected to a fine filter, which is connected to a one-way throttle valve. The one-way throttle valve is connected to a flow-regulating pipe, which is curved and located within the tank body. This invention adds a funnel-shaped expansion suction head at the oil suction port to reduce suction resistance and minimize inlet disturbance. The addition of a flow-regulating pipe at the oil return port slows down the return oil flow. Combined with the 45° oblique cut, this effectively disperses the impact force of the oil and reduces disturbance. Furthermore, the diagonal distribution of the oil suction and return ports extends the oil flow path, promoting impurity sedimentation and air separation.