30results about How to "Prevent noise leakage" patented technology

A vehicle steering system includes a sound absorbing material made of sponge and attached to an elastic joint which connects a second steering shaft extending from a steering wheel and a third steering shaft extending from a steering gear box to each other. The sound absorbing material faces an opening in a joint cover which is mounted on a dashboard and through which the second steering shaft passes. Therefore, the sound absorbing material absorbs noise which is produced in the steering gear box such that the noise does not pass from the engine room side through the opening in the joint cover to the vehicle compartment side, thereby preventing transmission of the noise to the vehicle compartment side. Further, the sound absorbing material requires only a simple shape and construction, thereby reducing the cost. Furthermore, the sound absorbing material does not come into sliding contact with the second steering shaft, and thus does not produce sliding noise or sliding resistance.

A vehicle steering system includes a sound absorbing material made of sponge and attached to an elastic joint which connects a second steering shaft extending from a steering wheel and a third steering shaft extending from a steering gear box to each other. The sound absorbing material faces an opening in a joint cover which is mounted on a dashboard and through which the second steering shaft passes. Therefore, the sound absorbing material absorbs noise which is produced in the steering gear box such that the noise does not pass from the engine room side through the opening in the joint cover to the vehicle compartment side, thereby preventing transmission of the noise to the vehicle compartment side. Further, the sound absorbing material requires only a simple shape and construction, thereby reducing the cost. Furthermore, the sound absorbing material does not come into sliding contact with the second steering shaft, and thus does not produce sliding noise or sliding resistance.

Provided is a connector for connection to a module board including an eject mechanism selectively ejecting a module from a module accommodating section. The eject mechanism includes a locking member that has a locking nib engageable with a recess of a case of the module. The locking member is rotatably supported by a sidewall section of a guide rail member, and thus can stay in an opening of the sidewall section. An eject button of the connector for connection to a module board has an operation section provided with a flange. The flange is pressed against the inner peripheral surface of a housing of an electronic device by a biasing force of coil springs all the time except for when the operation section is pushed in.

Provided is a connector for connection to a module board including an eject mechanism selectively ejecting a module from a module accommodating section. The eject mechanism includes a locking member that has a locking nib engageable with a recess of a case of the module. The locking member is rotatably supported by a sidewall section of a guide rail member, and thus can stay in an opening of the sidewall section. An eject button of the connector for connection to a module board has an operation section provided with a flange. The flange is pressed against the inner peripheral surface of a housing of an electronic device by a biasing force of coil springs all the time except for when the operation section is pushed in.

A wire harness includes a metal pipe; a high-voltage conductive path; and another conductive path. Another conductive path is configured as an unshielded electric wire. The high-voltage conductive path includes a high-voltage circuit; a shielding member; and an insulating member.

A carpet for use in vehicles includes an upper surface layer 2, a nonwoven fabric sound absorption layer 3 and an adhesive resin layer 4 integrally securing the upper surface layer and the sound absorption layer. The adhesive resin layer is an air permeable resin layer formed by extruding melted thermoplastic into filament-like resin pieces by an extruder, and a thickness direction air permeability of the carpet falls within the range of 1 to 50 cm3 / cm2·second. This carpet can secure excellent silence.

An upper surface layer 2 and a nonwoven fabric sound absorption layer 3 are integrally secured via an air permeable adhesive resin layer 4 formed by melting thermoplastic resin powder, and the air permeability of the thickness direction of the entire carpet 1 falls within the range of 1 to 50 cm3 / cm2·second. This effectively absorbs noise from the upper side entering via a roof, doors and windows as well as noise from the lower side. The carpet can be manufactured by scattering thermoplastic resin powder on an upper surface member, heating the thermoplastic resin powder into melted thermoplastic resin, placing a nonwoven fabric on the upper surface member via the melted thermoplastic resin, and pressing the nonwoven fabric and the upper surface member in a laminated state. It is preferable that powder of particle size of 90 to 10,000 μm is scattered in the amount of 5 to 500 g / m2.

An electronic apparatus (100) has an electronic device (151), a power supply plane (121) and a power supply plane (122) disposed with a gap (123) therebetween, a connection member (152) that electrically connects the power supply plane (122) and the electronic device (151), a ground plane (141) facing the power supply plane (121) or the power supply plane (122), a connection member (153) that electrically connects the ground plane (141) and the electronic device (151), a plurality of conductor elements (131) that is repeatedly arrayed, and open stubs (111) formed at a location overlapping the gap (123) included in an area surrounded by the conductor elements (131). In addition, at least some of the open stubs (111) face the power supply plane (122) which is not in contact with the open stubs (111).

An upper surface layer 2 and a nonwoven fabric sound absorption layer 3 are integrally secured via an air permeable adhesive resin layer 4 formed by melting thermoplastic resin powder, and the air permeability of the thickness direction of the entire carpet 1 falls within the range of 1 to 50 cm3 / cm2·second. This effectively absorbs noise from the upper side entering via a roof, doors and windows as well as noise from the lower side. The carpet can be manufactured by scattering thermoplastic resin powder on an upper surface member, heating the thermoplastic resin powder into melted thermoplastic resin, placing a nonwoven fabric on the upper surface member via the melted thermoplastic resin, and pressing the nonwoven fabric and the upper surface member in a laminated state. It is preferable that powder of particle size of 90 to 10,000 μm is scattered in the amount of 5 to 500 g / m2.

A first semiconductor chip (200) is mounted on a second semiconductor chip (100). The first semiconductor chip (200) has a first conductor pattern (222). The second semiconductor chip (100) has a second conductor pattern (122). The second conductor pattern (122) is formed at a region overlapping the first conductor pattern (222) in a plan view. At least one element selected from a group consisting of the first conductor pattern (222) and the second conductor pattern (122) has a repetitive structure.

The invention provides an improved drain valve for dew condensation in an air chiller unit mounted on an aircraft. The drain valve 160 attached to a drain of a drain pan in an air chiller unit is equipped with a valve seat member 162 having an opening 162a at the center and a valve member 164 disposed to contact the lower surface of the valve seat member 162. The valve member 164 is made of thin silicon rubber, and arms 164b created by slits formed thereto support a valve means 164e with extremely small spring constant. While the air chiller unit is operating, the valve means 164e is air tightly attached to the opening 162a of the valve seat by negative pressure, closing the drain valve. When the operation stops and dew drops gather on the valve means 164e, the valve means 164e is displaced by the weight and the valve is opened. When there are no dew drops, the valve is closed to prevent moisture from entering.

It is an object to reduce noise leakage out of an apparatus, and improve reliability of an electric brake control apparatus. An electric brake control apparatus includes: a motor that includes a housing made of a conductive member; a control unit that performs drive control of the motor; and a hydraulic unit that includes a housing made of a conductive member, and further includes a conductive connection member that electrically connects a ground line of the control unit, the housing of the motor and the housing of the hydraulic unit to each other.

A cooling mechanism for a circuit board includes a board having electronic components disposed thereon, one or more heat radiation plates disposed on the board, a cooling fan for cooling the board and the electronic components disposed on the board by blowing air to at least one of the heat radiation plates, and a metal plate attached to one end of the board to ground the board, thereby preventing the leakage of electromagnetic radiation noises from the electronic components. Further, the metal plate includes a bent portion bent in L-shape along a lateral side of the board, and the cooling fan is so disposed at the inner side of the bent portion as to be perpendicular to the board. Furthermore, an air receiving surface of the heat radiation plate is so arranged as to be oblique to an axial blowing direction of the cooling fan.

The invention provides an improved drain valve for dew condensation in an air chiller unit mounted on an aircraft. The drain valve 160 attached to a drain of a drain pan in an air chiller unit is equipped with a valve seat member 162 having an opening 162a at the center and a valve member 164 disposed to contact the lower surface of the valve seat member 162. The valve member 164 is made of thin silicon rubber, and arms 164b created by slits formed thereto support a valve means 164e with extremely small spring constant. While the air chiller unit is operating, the valve means 164e is air tightly attached to the opening 162a of the valve seat by negative pressure, closing the drain valve. When the operation stops and dew drops gather on the valve means 164e, the valve means 164e is displaced by the weight and the valve is opened. When there are no dew drops, the valve is closed to prevent moisture from entering.

It is, accordingly, an object of the present teachings to provide fuel injectors that can prevent leakage of noise, which is caused by contact of the valve with the valve seat, to the outside of the fuel injector. a representative injector may comprise a fuel passage, a valve, a valve seat, a jet opening and a jet opening downstream channel. The valve is disposed on the fuel passage and the valve seat receives the valve. The jet opening is formed in the valve seat and through which fuel is exhausted. The jet opening may be opened when the valve is moved apart from the valve seat. The jet opening downstream channel extends downstream from the jet opening through the valve seat and communicates the jet opening to the outside. The diameter of the jet opening downstream channel may be arranged and adapted such that the valve seat has a wall thickness to prevent leakage of noise to the outside through the valve seat. Because the diameter of the jet opening downstream channel is designed to be smaller and the wall thickness of the valve seat is designed to be greater, the representative injector can effectively prevent leakage of noise to the outside through the valve seat.

The invention discloses a network switch cover. The network switch cover comprises a framework, a casing covering the framework, and a sound abatement side board and an end face door which are oppositely arranged on the framework, wherein the framework, the casing, the sound abatement side board and the end face door form an enclosed space, the network switch is arranged in the enclosed space, the top face of the framework is provided with a top sound abatement channel, the bottom face is provided with a bottom sound abatement channel, one end of the top sound abatement channel is provided with a top air flow outlet communicated with an outer portion of the enclosed space, the other end is provided with a top air flow inlet communicated with an inner portion of the enclosed space, the top air flow inlet is equipped with an air pumping part used for pumping the air flow into the top sound abatement channel, one end of the bottom sound abatement channel is provided with a bottom air flow inlet communicated with the outer portion of the enclosed space, and the other end is provided with a bottom air flow outlet communicated with the inner portion of the enclosed space. The network switch cover is advantaged in that the network switch cover realizes noise reduction, realizes good heat radiation, has a simple structure, is convenient to process and has wide application occasions.

A resilient shielding member for a device (10) is disposed in a facing space (300) between a conductive motor case (10) of a motor (100) and an inverter case (201) of an inverter device (200). The resilient shielding member surrounds first terminal fittings (102) and second terminal fittings (202) connecting the motor (100) and the inverter device (200) over the entire circumference and is formed by integrating a waterproofing component (11) configured to resiliently contact the motor case (101) and the inverter case (201) in a liquid-tight manner over the entire circumference and a shielding component (13) configured to conductively contact the motor case (101) and the inverter case (201).

A wiring board includes a metal cap pad that is arranged so as to surround a mounting position of an electronic component and is connected to an end portion of a metal cap, a power source plane that is connected to the electronic component through a connection member and has a gap, a ground plane that is connected to the electronic component through a connection member, and a plurality of conductive body elements that are repeatedly arranged so as to surround the connection members and the gap. The power source plane and the ground plane extend so as to include at least a part of an area that is surrounded by the plurality of conductive body elements and at least a part of an area facing the plurality of conductive body elements.

It is an object of the invention to provide a digital broadcast receiving unit capable of restraining the influence of a noise generated in a digital signal processing circuit to be exerted upon a turner unit, and of arranging a digital signal processing circuit board close to the tuner unit while restraining the influence exerted upon a peripheral circuit thereof and so forth even if the tuner unit is laid out on any location of a main circuit board. Both the tuner unit and the digital signal processing circuit board substantially stand upright on the main circuit board, respectively. The digital signal processing circuit board is disposed close to the tuner unit along the longitudinal direction thereof, and the digital signal processing circuit board has a mounting face on which electronic components such as ICs and so forth are mounted at a side facing tuner unit. Ground patterns are formed on the digital signal processing circuit board at a side opposite to the tuner unit and is rendered in an exposed state having no sealed case.

The invention provides an air cylinder, a slip sheet spring fixing structure and a rotary compressor. The air cylinder is provided with a slip sheet groove which is formed in the wall of the air cylinder in the radial direction. The radial outer side of the slip sheet groove is provided with a spring hole communicating with the slip sheet groove. The tail end of the spring hole is a sealed end formed by the wall of the air cylinder. A spring installation guiding opening communicating with the spring hole is formed in the spring hole along at least one of the two air cylinder side walls in the axial direction of the air cylinder. By arranging the tail end of the spring hole to be the sealed end composed of the wall of the air cylinder, the situation that a slip sheet spring is ejected out of the spring hole by a slip sheet during working is prevented, and the work reliability of the compressor is ensured; and meanwhile, the situation that noise in a compressor pump body is transmitted to a shell body and the outside through the spring, namely, noise outleakage occurs, is avoided. Moreover, according to the air cylinder, the slip sheet spring fixing structure and the rotary compressor, the structure is simple, and the manufacturing cost is low.

An object of the present invention is to provide an electrical junction box having a new structure that can restrain noises from leaking through a support member and can advantageously secure a fixing strength onto the support member in the electrical junction box fixed on a support member by inserting an arm section projecting from a box main body into an attaching aperture in the support member. An arm section is loosely inserted into a support member. The arm section is provided on its extending distal end with an engaging portion that is pushed through an attaching aperture in the support member into an interior of the support member to be engaged with a rear surface of the support member. The arm section is integrally provided with a first wall portion opposed through the support member to the engaging portion. The first wall portion covers the attaching aperture.

The invention discloses a noise elimination pipeline and a sweeping vehicle. The noise elimination pipeline comprises a plurality of pipe layers. The pipe layers include a supporting layer, a noise elimination layer and a noise isolation layer. The supporting layer is arranged on the innermost side of the multiple pipe layers. The noise elimination layer is supported on the periphery of the supporting layer, and the noise isolation layer is arranged on the periphery of the noise elimination layer. According to the noise elimination pipeline, due to the supporting layer, the strength of the noise elimination pipeline can be guaranteed, and the relatively high static pressure resisting capability is achieved; due to the noise elimination layer, the noise elimination pipeline can effectively lower the noise of a fluid flow path applying the noise elimination pipeline; and due to the noise isolation layer, the noise leakage of the fluid flow path at the position of the noise elimination pipeline can be avoided, and the noise elimination layer can be prevented from being polluted by the outside environment. The noise elimination pipeline serves as a connecting pipeline of the sweeping vehicle and can effectively prevent the draught fan noise from leaking at the position of the connecting pipeline, and the noise level of a pneumatic conveying system and the whole sweeping vehicle is effectively reduced.

A resilient shielding member for a device (10) is disposed in a facing space (300) between a conductive motor case (10) of a motor (100) and an inverter case (201) of an inverter device (200). The resilient shielding member surrounds first terminal fittings (102) and second terminal fittings (202) connecting the motor (100) and the inverter device (200) over the entire circumference and is formed by integrating a waterproofing component (11) configured to resiliently contact the motor case (101) and the inverter case (201) in a liquid-tight manner over the entire circumference and a shielding component (13) configured to conductively contact the motor case (101) and the inverter case (201).

The invention relates to the field of noise reduction for compressors, in particular to a high-noise noise reduction device for compressors, which includes a noise reduction cylinder, an adjustment structure, a fixed structure, an auxiliary structure, a rubber sleeve, a protective structure, and a sound-absorbing groove; The linkage between them, the adjustment structure rotates into the inside of the muffler and then squeezes the outer wall of the rubber sleeve, so that the rubber sleeve tightly squeezes the outside of the exhaust pipe, so that the exhaust pipe is fixed inside the muffler, and the exhaust pipe Protect the exhaust pipe while reducing noise to prevent the exhaust pipe from shaking and affect the work. When the adjustment structure enters the interior of the muffler, the protective structure is pushed to work, and lubricating oil is injected between the adjustment structure and the rubber sleeve. While lubricating and protecting the adjustment structure, an oil seal is provided between the adjustment structure and the rubber sleeve to prevent the noise leakage generated when the exhaust pipe is working. Through multiple sets of sound-absorbing grooves distributed in a ring shape, the noise generated by the exhaust pipe is fully suppressed. Absorption, for noise reduction.

The invention discloses a computer case which comprises a panel, a tail plate, a top plate, a bottom plate and two side plates, cooling and heat conducting assemblies are arranged at the two side plates respectively, and each cooling and heat conducting assembly comprises a square plate and a cylindrical block body; the square plate is buckled on the inner wall of the corresponding side plate andconnected with the inner wall of the corresponding side plate in a sealed mode to form a water tank; the interior of the cylindrical block body is hollow, the cylindrical block body is attached to theouter wall, facing the center of the computer case, of the water tank, a plurality of vertical C-shaped metal pipes are connected between the outer wall of the upper semi-circumference and the outerwall of the lower semi-circumference of the cylindrical block body, and the two ends of each C-shaped metal pipe are both communicated with a hollow part of the cylindrical block body; an axial flow fan is arranged on the end face, facing the center of the computer case, of the cylindrical block close to the side plate on one side, and a centrifugal fan is arranged on the end face, facing the center of the computer case, of the cylindrical block close to the side plate on the other side. According to the computer case, the temperature in the case can be effectively reduced, fan noise leakage can be avoided, and meanwhile, an ash layer entering the case can be reduced.

The invention discloses a computer case, which comprises a panel, a tail plate, a top plate, a bottom plate and two side plates, and the two side plates are provided with cooling and heat-conducting components, and the cooling and heat-conducting components include: a square plate, which is fastened on the The inner wall of the side plate is sealed and connected with the inner wall of the side plate to form a water tank; the cylindrical block is hollow inside and attached to the outer wall of the water tank facing the center of the computer case, and the top of the cylindrical block A plurality of vertical C-shaped metal tubes are connected between the outer wall of the semi-circumference and the outer wall of the lower half-circumference, and both ends of the C-shaped metal tubes are connected with the hollow part of the cylindrical block; An axial flow fan is provided on the end face of the body facing the center of the computer case, and a centrifugal fan is provided on the end face of the cylindrical block near the other side plate facing the center of the computer case. The invention can not only effectively reduce the temperature in the case, but also avoid the noise leakage of the fan, and at the same time reduce the dust layer entering the case.