38results about How to "Avoid making noise" patented technology

A feed pump includes an impeller with two rings of guide blades delimiting blade chambers. The rings of guide blades concentrically surrounding one another and have different angular intervals between guide blades. The angular intervals between the guide blades of each ring vary within a range of values and ranges of values of each ring of guide blades is different to avoid the additions of noise emissions the feed pump consequently has noises which cause particularly little disturbance.

The present invention relates to an internal rotation type direct motor-drive portable angle grinder. By means of the direct drive, the present invention prevents the emission of noise made by angle type transmission devices; and / or an inertial body is installed on the motor rotating part to form a flywheel to improve the grinding, polishing and machining or cutting abilities of the grinding wheel; and / or a motor is established to be open or semi-hermetic for the space from the interior to a housing and / or a handle of the motor to improve the effect of heat dissipation outward.

An electrically-driven steering column apparatus includes a steering column rotatably holding a steering shaft and capable of adjusting a position of the steering wheel, and a power transmission mechanism for transmitting to the steering column a rotational driving force of an electric motor as a position adjusting motion driving force, wherein the power transmission mechanism has a joint constructed of a spherical joint element and a cylindrical joint element in which the spherical joint element is slidably fitted, on within a driving force transmission route.

An impact absorption type steering column apparatus for a vehicle is constructed such that a steering column is moved forwardly of the vehicle with respect to a car body sided member when a secondary collision happens. An outer peripheral surface of the steering column is fitted with a metallic ring that engages with the car body sided member to absorb impact energy while frictionally sliding on the steering column moving forwardly of the vehicle, when the secondary collision happens.

A radiation detector is provided that has no fluctuations in detection sensitivity and is capable of suppressing the influence of the noise emitted from a light source. In the radiation detector in the present invention, a light emitting unit applies light to the end face of a flat light guide. On receiving the light, the flat light guide emits flat light from its surface toward an active matrix substrate. The light is led to a semiconductor thick film after passing through the active matrix substrate. The noise emitted from the light emitting unit to the active matrix substrate or the semiconductor thick film can be blocked by an electromagnetic shield. An incident radiation to the semiconductor thick film in this condition can be detected while the effect of the noise emitted from the light emitting unit is suppressed, and fluctuations in radiation sensitivity do not occur.

The present invention is an original direct motor-drive portable angle grinder with a disc type motor installed in a position adjacent to the grinding wheel and an outer motor rotating part coaxially and directly driving the grinding wheel. By means of the direct drive, the present invention prevents the emission of noise made by angle type transmission devices. Moreover, an inertial body is installed on the rotating housing that is integrated with the rotating part to form a flywheel or the rotating housing and the inertial body are integrated into a single reinforced structure to enable a flywheel function in order to improve the grinding, polishing and machining or cutting abilities of the grinding wheel.

An apparatus for improving reception sensitivity of a public wave receiver includes power devices formed in a power supply of the public wave receiver, and a shielding plate for shielding noise generated by the power devices. A signal line for connecting an antenna used for the public wave receiver to a public wave receiver main body and a ground line are formed coaxially to each other by a shield layer.

The transceiver-integrated antenna includes an antenna element, a ground plate for grounding the antenna element, and a transceiver configured to transmit and receive radio signals through the antenna element. The transceiver is housed in a recess formed in the ground plate. The ground plate serves as not only a plane for grounding the antenna element, but also a radiator for dissipating the heat emitted from the transceiver.

The present invention relates to an assembled shaft element, in particular an assembled camshaft for valve-controlled internal combustion engines, wherein a hub body having at least one functional part, in particular at least one cam, is held on a shaft by a formfit connection using a splined tooth system in the circumferential direction, wherein the splined tooth system includes shaft splines formed on the shaft and interacting with hub body splines formed in a hub body recess. According to the invention, the at least one hub body (14) is held in addition to the circumferential formfit connection by an interference fit on the shaft (12) implemented by a press fit between a tooth circle of the shaft splines (22) and a root circle of the hub body splines (26). The invention further relates to a method for producing an assembled camshaft for valve-controlled internal combustion engines.

An impact absorption type steering column apparatus for a vehicle is constructed such that a steering column is moved forwardly of the vehicle with respect to a car body sided member when a secondary collision happens. An outer peripheral surface of the steering column is fitted with a metallic ring that engages with the car body sided member to absorb impact energy while frictionally sliding on the steering column moving forwardly of the vehicle, when the secondary collision happens.

The invention relates to a system and method for cooling and dehumidifying air in a room. The system includes a processing unit structured and arranged to process a coolant to achieve a cooling that exceeds cold due to evaporation, wherein the coolant cools and dehumidifies air coming into contact with the coolant. The system also comprises a distribution unit arranged to expose the coolant to the air and a collecting unit structured to feed the coolant that has come into contact with the air into the processing unit.

A feed pump includes an impeller with two rings of guide blades delimiting blade chambers. The rings of guide blades concentrically surrounding one another and have different angular intervals between guide blades. The angular intervals between the guide blades of each ring vary within a range of values and ranges of values of each ring of guide blades is different to avoid the additions of noise emissions the feed pump consequently has noises which cause particularly little disturbance.

The invention discloses a die cutting machine with good buffering performance. The die cutting machine comprises a base, an operation platform is fixedly connected at the top pf the base, the top of the operation platform is fixedly connected with a die cutting machine body and provided with a positioning rod, one end of the positioning rod penetrates the operation platform and extends to the outside of the same, the outer surface of the operation platform is fixedly connected with a limiting ring and the outer surface of the positioning rod contacts with the inner wall of the limiting ring; the bottom of the die cutting machine body is fixedly connected with a first transverse plate, the bottom of the first transverse plate is fixedly connected with an annular rubber ring, one end, away from the first transverse plate, of the annular rubber ring is fixedly connected with a second transverse plate, one side face, away from the annular rubber ring, of the second transverse plate is fixedly connected with a first buffering pad, and one side face, away from the second transverse plate, of the first buffering pad is fixedly connected with a powerful spring. Damping effect is improved integrally, vibration amplitude caused by integral operation is reduced, loosening of internal connecting elements is avoided, and accuracy of processing operation is improved.

A noise reduction type purge control solenoid valve includes a body including a connector that supplies electricity from the exterior; a cover coupled to the body having a fluid inlet and a fluid outlet, and formed with a fluid discharge passage connected to the fluid outlet therein; a solenoid component disposed in the body; and an armature disposed between the solenoid component and the fluid discharge passage and moving upward and downward by the solenoid component to open and close the fluid discharge passage. Further, a noise reduction member is mounted on the armature to reduce noise generated by contact between the fluid discharge passage and the armature. A noise reduction wall protrudes along a circumference of an upper surface of the noise reduction member.

The invention relates to an odour seal for a vacuum toilet drain system whose cross section in the state of no throughflow tapers off in such a way in the downstream direction that the interior walls on the downstream end of the odour seal rest against each other so that the odour seal in a downstream direction allows throughflow while in the opposite direction it blocks throughflow, wherein the downstream end of the odour seal is closed in the state of throughflow and no throughflow of the odour seal. Furthermore, the invention relates to a drainage device comprising such an odour seal and a sieve which is arranged upstream of the odour seal. Moreover, the invention relates to a vacuum toilet system for an aircraft, comprising such an odour seal or a drainage device.

The present invention relates to an internal rotation type direct motor-drive portable angle grinder. By means of the direct drive, the present invention prevents the emission of noise made by angle type transmission devices; and / or an inertial body is installed on the motor rotating part to form a flywheel to improve the grinding, polishing and machining or cutting abilities of the grinding wheel; and / or a motor is established to be open or semi-hermetic for the space from the interior to a housing and / or a handle of the motor to improve the effect of heat dissipation outward.

An electrically-driven steering column apparatus includes a steering column rotatably holding a steering shaft and capable of adjusting a position of the steering wheel, and a power transmission mechanism for transmitting to the steering column a rotational driving force of an electric motor as a position adjusting motion driving force, wherein the power transmission mechanism has a joint constructed of a spherical joint element and a cylindrical joint element in which the spherical joint element is slidably fitted, on within a driving force transmission route.

The invention relates to the field of chairs and provides a chair. The chair comprises a bottom plate and a theft alarming mechanism, wherein the surface of the bottom plate is welded with a support plate, the surface of the support plate is welded with a support seat plate, the upper surface of the support seat plate is fixedly connected with a support spring, one end of the support spring, whichis away from the support seat plate, is fixedly connected with the lower surface of an elastic seat plate, and the right of the elastic seat plate is in an arc shape; the surface of the support seatplate is welded with a backrest plate, the surface of the backrest plate is provided with extending grooves, the inner walls of the extending grooves are slidingly connected with support rods and fixedly connected with extending springs. The chair allows hanging a backpack on the back to avoid occupying the moving space of a sitting posture and meanwhile to achieve anti-theft and loss-preventing effects, thereby effectively solving the problems that chairs in public places are inconvenient for backpack hanging and theft prevention and also anti-theft measures can impact the comfort level of sitting position of users.

The invention discloses a pneumatic turnover device. The pneumatic turnover device comprises a long arm, a short arm and an air cylinder; the air cylinder comprises an air cylinder sleeve, a piston, a piston rod, a sealing ring, a guide sleeve, a spring, lubricating oil and nitrogen, the guide sleeve is inserted into a sleeve opening of the air cylinder sleeve in an airtight mode, the lubricating oil and the nitrogen are contained in the air cylinder sleeve, the end, opposite to the end with the sleeve opening, of the air cylinder sleeve is hinged to the first hinge end, and the piston rod is connected to the guide sleeve in an airtight penetrating mode; the piston is fixed to one end of the piston rod and is located in the air cylinder sleeve, one end of the spring is fixedly connected to the inner side end of the guide sleeve, the other end of the spring extends to the interior of the air cylinder sleeve in the axial direction of the piston rod, an annular groove is formed in the peripheral wall of the piston, the piston is divided by the annular groove so as to form a first annual plug far away from the guide sleeve and a second annual plug close to the guide sleeve, and the first annular plug is in clearance fit with the air cylinder sleeve. By means of the pneumatic turnover device, after the piston rod is stressed, the piston stably slides in the piston sleeve, a rotating plate is driven to be stably opened and closed and can be stopped at any position in the middle, and the pneumatic turnover device is convenient to use.

A radiation detector is provided that has no fluctuations in detection sensitivity and is capable of suppressing the influence of the noise emitted from a light source. In the radiation detector in the present invention, a light emitting unit applies light to the end face of a flat light guide. On receiving the light, the flat light guide emits flat light from its surface toward an active matrix substrate. The light is led to a semiconductor thick film after passing through the active matrix substrate. The noise emitted from the light emitting unit to the active matrix substrate or the semiconductor thick film can be blocked by an electromagnetic shield. An incident radiation to the semiconductor thick film in this condition can be detected while the effect of the noise emitted from the light emitting unit is suppressed, and fluctuations in radiation sensitivity do not occur.

A thermoceramic lifter of a thermotherapy apparatus that applies pressure to acupressure points of a user and smoothly and silently raises and lowers itself as needed, applies pressure comfortably to local areas as specified by the user, and has a simple lifting structure, is provided. The lifter (200) of a thermoceramic unit (100) lifts and lowers the thermoceramic unit (100) at a predetermined location along a lengthwise movement of the thermoceramic unit (100). The lengthwise movement is enabled by a conveyor in the thermotherapy apparatus. The lifter (200) includes a box-shaped guiding block (220), a geared motor (210) installed opposite to the open side of the guiding block (220), a sliding block (230) raised and lowered within the guiding block (220) linear movement, and a cover plate (240) to cover the open side of the guiding block (220).

A combustion engine comprising at least a cylinder, a generator having a generator shaft with a generator shaft gear, a crankshaft having a crankshaft gear and a control unit, which controls at least the generator in such a way that it is possible to avoid a tooth flank change between the generator shaft gear and the crankshaft gear during an entire combustion cycle of the combustion engine.

The invention is based on a method for detecting slip in the driving of generator or starter-generator systems. The alternators of these systems are equipped with electronic control components such as pulse-width-modulated inverters or rectifier bridges. The drive torque of the alternator is transferred to this by means of a belt drive of an internal combustion engine. When slip is detected in a comparison step (3), to which speed-dependent input variables (1, 2) are forwarded, the maximum transferrable drive torque is determined in a torque limiting step (18, 20), and a closed-loop control (23) adjusts the generator output power to said maximum transferrable drive torque.

The invention relates to an odor seal for a vacuum toilet drain system whose cross section in the state of no throughflow tapers off in such a way in the downstream direction that the interior walls on the downstream end of the odor seal rest against each other so that the odor seal in a downstream direction allows throughflow while in the opposite direction it blocks throughflow, wherein the downstream end of the odor seal is closed in the state of throughflow and no throughflow of the odor seal. Furthermore, the invention relates to a drainage device comprising such an odor seal and a sieve which is arranged upstream of the odor seal. Moreover, the invention relates to a vacuum toilet system for an aircraft, comprising such an odor seal or a drainage device.

The invention relates to the field of paper machining, in particular to a noise treatment system for a paper mill. The system comprises a hush pipe, wherein one end of the hush pipe is provided with arotating sleeve used for being rotationally connected to an air outlet pipe of a fan, the rotating sleeve is provided with an air inlet used for communicating with the air outlet pipe of the fan andan air outlet used for communicating with the hush pipe, a dust filtering cavity is formed in the rotating sleeve, the dust filtering cavity, the air inlet and the air outlet communicate, and a filterscreen is arranged in the dust filtering cavity. In addition, the invention further provides a treatment method adopting the treatment system. Through the treatment system and the treatment method, the noise reduction effect of the paper mill is improved.

A method of monitoring wind turbine emission of tonal noise is provided. The method comprises receiving a noise notification as a message from a third party, determining a time associated with the message, and acquiring sensor data from a sensor, with the sensor data being indicative of an operating parameter of a wind turbine. The method further comprises correlating the noise notification with the acquired sensor data based on the time associated with the message.

The invention relates to a device (1) for damping pressure pulsations for a compressor of a gaseous fluid, in particular of a refrigerant. The device comprises a housing (2), a piston element (6) as well as a spring element (8). The housing (2) is developed encompassing a chamber (3), with an inlet opening (4) and an outlet opening (5). The piston element (6), supported such that it is stayed across the spring element (8) on the housing (2), is disposed within the chamber (3) dividing the chamber (3) into a first chamber volume (3a) and a second chamber volume (3b), as well as being disposed movably in a direction of motion (11) between a first end position and a second end position. The motion of the piston element (6) effects a change of the chamber volumes (3a, 3b) and of a flow cross section of the outlet opening (5). The piston element (6) is developed as a hollow cylinder with two, at least partially closed, end faces (7, 13). The piston element (6) herein comprises at least one through-opening (14, 15) developed as a fluidic connection between a chamber volume (3a, 3b) and a volume encompassed by a wall of the piston element (6).

The invention discloses a pneumatic turning device, which comprises a long arm, a short arm and a cylinder. The cylinder comprises a cylinder liner, a piston, a piston rod, a sealing ring, a guide sleeve, a spring, lubricating oil and nitrogen, and the guide sleeve is airtightly inserted into the cylinder liner. The sleeve port, lubricating oil and nitrogen are built in the cylinder liner, the end of the cylinder liner opposite to the sleeve port is hinged to the first hinged end, the piston rod is airtightly connected to the guide sleeve, and the piston is fixed on the end of the piston rod and located in the cylinder liner. One end of the spring is fixedly connected to the inner end of the guide sleeve, and the other end of the spring extends into the cylinder liner along the axial direction of the piston rod. There is an annular groove on the peripheral wall of the piston, and the annular groove divides the piston to form a first ring away from the guide sleeve. Plug and the second ring plug close to the guide sleeve, the first ring plug is in clearance fit with the cylinder liner. The invention can make the piston slide smoothly in the piston sleeve after the piston rod is stressed, drive the rotating plate to open and close smoothly, and stop at any position in the middle, which is convenient for use.

The invention relates to the field of paper processing, in particular to a noise treatment system for a paper mill, comprising a muffler pipe, one end of the muffler pipe is provided with a rotating sleeve for being rotatably connected to an air outlet pipe of a fan, and the rotating sleeve is provided with a rotating sleeve for The air inlet communicated with the air outlet pipe of the fan and the air outlet used to communicate with the muffler pipe, the rotating sleeve is provided with a dust filter cavity, the dust filter cavity, the air inlet and the air outlet are connected, and a filter screen is arranged in the dust filter cavity. In addition, the present invention also improves a processing method using the above-mentioned processing system. Through the present invention, the noise reduction effect of the paper mill is improved.