66results about How to "Avoid unusual noise" patented technology

The present invention provides a grease composition capable of securely preventing an abnormal noise from being generated when it is cold and having a long life at a high temperature, and a rolling bearing in which this grease is enclosed. The grease composition having heat-resistant properties and performance of preventing the generation of a low-temperature abnormal noise contains a base oil, a thickener, and an additive, and is used for a rolling bearing. A worked penetration of the grease composition at 25° C. is 300 or less, and an unworked penetration thereof at −20° C. is 200 or more. The grease-enclosed rolling bearing has an inner ring, an outer ring, rolling elements interposed between the inner ring and the outer ring, and the above-described grease composition enclosed on a periphery of the rolling elements. The grease-enclosed rolling bearing is used for an automotive electric auxiliary machine.

The present invention relates to a control method of a low voltage operation constant speed air conditioner, which is characterized in that the rotary speed of an indoor electric motor is adjustable, when the network voltage is changed, a conduction angle of a controlled silicon in a motor-drive circuit is adjusted in order to stabilize the rotary speed of the indoor electric motor, the different rotary speed shifts of an outdoor electric motor are changeable, under different ranges of the network voltage and/or different external disk temperature of the outdoor condenser, the outdoor electric motor operates on the different rotary speed shifts, controlling compressor overflowing protection, the closing down overflowing protection of the compressor is fed with the protection current value lower heat protector before the system heat protector feeds protection, and the batch restart of the compressor are completed within the setting time after feeding protection. The air conditioner of the present invention can be normal starting under 180V even under the condition of lower electric voltage and keep operation, the abnormal noise can be avoided when the electric network fluctuates, and the present invention can be active closing down protection and rapidly be automatic recovery normal running after electric voltage resumption.

The invention relates to a method for automatically controlling yaw damping of a wind power unit and belongs to the technical field of wind power. The method is characterized by stably controlling the yaw damping in real time by using a magnetic suspension yaw system and comprises the following steps: firstly calculating wind torque TW of wind acting on an engine room when wind direction is changed; enabling the engine room to suspend and rise to a balance point if TW is smaller than driving torque TN needed for the yaw of the engine room, and forward feeding to generate forward electromagnetic torque by a yaw motor stator; enabling the engine room to suspend and rise to the balance point if TW is greater than TN and smaller than 2TN, and backward feeding to generate backward electromagnetic torque by the stator and increasing the raw damping; not suspending if TW is greater than 2TN, adjusting current of a yaw motor rotor, enabling the generated electromagnetic attraction force to be smaller than the gravity of the engine room, generating friction resistance so as to increase the yaw damping, and forward feeding by the stator; and enabling the engine room to yaw at a given yaw speed. The method is capable of controlling the yaw damping of the wind power unit in real time, so that the wind power unit has the advantages of no noise, accurate wind orientation and simple and convenient maintenance.

A headrest that is versatile, in which operation load in tiling of the headrest from a head support position to a stowed position is reduced for easy headrest tilting operation and in which noise or abnormal sound caused by the headrest is prevented, and a vehicle seat with such a headrest. [MEANS FOR SOLVING PROBLEMS] The headrest can be set to a head support position where the headrest is erected relative to the backrest and to a stowage position where the headrest is tilted from the head support position. The head rest includes a pillar (1) having a lateral shaft section (12) and mounted on the upper part of the backrest (S2), a headrest frame (2) pivotally engaged with the lateral shaft section (12) of the pillar (1), headrest frame urging means (3) for urging the headrest frame (2) to one side, lock means (4) capable of preventing relative pivoting between the headrest frame (2) and the pillar (1), a ratchet lever (44) for operating the lock means and sliding laterally, and ratchet lever urging means (45) for urging the ratchet lever (44). The ratchet lever urging means (45) urges the ratchet lever (44), which slides laterally, at a predetermined angle.

A hinge member 3 that is attached to a document pressing plate 2 and includes a tubular supporting leg 5, in which a projection member 7 is incorporated so that a tip 71a of the projection member 7 appears and disappears in an opening part 6, and a spring member 8 for always biasing the projection member so that the tip 71a of the projection member 7 projects from the opening part 6 is also incorporated. Thus, by attaching the tip 71a that projects from the opening part 6 of the projection member 7 to an inner wall surface 4a of the supporting hole 4, the tubular supporting leg 5 of the hinge member 3 can be securely fixed in the supporting hole 4 without jouncing.

The invention relates to a barrel-shaped part supporting structure for an automatic transmission. The automatic transmission drives an oil pump by transmitting the rotation of an input shaft to an internal gear of oil pump by utilizing the barrel-shaped part of the input shaft. The barrel-shaped part supporting structure can prevent the vibration of the barrel-shaped part from generating noise. Anoil pump driving shaft (70) drives the oil pump by transmitting the rotation of the input shaft (10) of the automatic transmission to an internal gear (60) of oil pump (OP). In the supporting structure of the oil pump driving shaft, the oil pump driving shaft is supported by a shaft sleeve (62) of an oil pump shell (50) and a rotating shaft part (24) of a motor (M). The oil pump driving shaft isformed by setting an O-shaped ring (64) on a position (Y) opposite to an extending part (27) of a rotation shaft outside the oil pump driving shaft, wherein the position (Y) is the position having maximum amplitude when the rotation of the internal gear is transmitted to a connecting part (71) of the oil pump driving shaft.

The invention provides a cross flow blade. The cross flow blade comprises multiple middle-section blades coaxially connected, wherein stagger angles are respectively formed between any adjacent two middle-section blades; and the deflection directions of the stagger angles between the blades with the same structure in at least one set of adjacent middle-section blades are oppositely arranged. The deflection directions of the stagger angles between one set of the middle-section blades in the cross flow blade are set as directions opposite to original deflection directions, the blades of the middle-section blades of the cross flow blade in the same generatrix position are deviated from the generatrix to return to the generatrix position, and the blades of the cross flow blade with the same structure are distributed near the generatrix of the cross flow blade in the length direction of the cross flow blade, so that the problem of air outlet ununiformity of the cross flow blade in the same generatrix position is solved to a certain extent, the air outlet uniformity of an indoor unit is improved, and airflows blown to a worn tongue prevent products from generating instable abnormal noise to improve the tone quality of the indoor unit. The invention further provides an air conditioner.

The invention relates to a control method of a wind turbine generator yaw damping moment, and belongs to the technical field of wind power generation. The method comprises the steps that an electromagnetic yaw system is adopted for controlling the yaw damping moment in real time, when the wind direction is changed, the wind power rotating torque of wind power action on an engine room is calculated at first; if the wind power rotating torque is smaller than driving torque needed by yaw of the engine room, the current of a yaw motor rotor is adjusted, so that the generated electromagnetic attraction force is equal to the gravity of the engine room so as to reduce the yaw damping torque; if the wind power rotating torque is larger than or equal to the driving torque needed by yaw of the engine room, the current of the yaw motor rotor is adjusted, so that the generated electromagnetic attraction force is smaller than the gravity of the engine room, and the generated friction resisting moment increases the yaw damping torque; three-phase alternating current is led into the yaw motor rotor and then the engine room is driven to perform yawing according to the given yaw rotating speed. The yaw damping torque of the wind turbine generator is regulated in real time, and the control method has the advantages of being easy and convenient to control, accurate in wind alignment, low in yaw energy consumption, free of noise, little in maintenance and the like.

The present invention provides a centrifugal clutch capable of preveting vibration of a cluth housing and effectively preventing ccurrence of abnormal sound. This centrifugal clutch is composed of the clutch housing 12 composed of a circular cylindrical part 12a whose inner face becomes a slide-contact face and a bottom plate part 12b covering one end part of the circular cylindrical part, a rotary shaft which has the same axis as the circular cylindrical part of the clutch housing and to which rotation force is transmitted by the clutch housing, a centrifugal shoe for connecting with the clutch housing 12 or disconnecting from it by rotating around the rotary shaft and coming into contact with or leaving the slide-contact face, and a vibration control cover 17 put on an outer side of the circular cylindrical part. The clutch housing 12 and the vibration control cover 17 have contact parts 30, 40 coming into contact mutually, a non-contact part 50 not in contact, and positioning marks 14, 22 for positioning the clutch housing 12 and the vibration control cover 17 at predetermined relative positions for preventing occurrence of abnormal sound.

The invention discloses an installing structure for an air outlet grid of an outdoor unit of an air conditioner. The installing structure comprises an air outlet and the air outlet grid, wherein the air outlet is formed on a shell of the outdoor unit; the air outlet grid is arranged at the air outlet; corresponding hook grooves and hooks are formed on the edge of the air outlet and edge of the air outlet grid respectively; a connecting rod extending inwards vertical to a plane where the air outlet grid is arranged is formed integrally on the edge of the air outlet grid; through holes are formed correspondingly at corresponding positions at the air outlet of the outdoor unit and the connecting rod of the air outlet grid; a fixing block which is fixedly connected with the connecting rod is arranged inside the outdoor unit; and the fixing block is pressed against the bent part of an exchanger. According to the installing structure for the air outlet grid of the outdoor unit, the air outlet grid and a condenser bent section are fixed simultaneously by using a bolt structure, so that an original sheet iron groove used for fixing the condenser bent section is eliminated; and meanwhile, the installing structure is directly fixed on a front panel by adopting the bolt structure, so that the installing structure is steady and is prevented from falling off in a transporting process, and abnormal noise in a market is greatly lowered.

A vehicular rear wheel steering device (100) includes a housing (10), a rod (21) being non-turnable with respect to the housing (10) and movably supported in an axial direction of the rod (21), and a conversion mechanism (40) arranged between the rod (21) and the housing (10) to convert a rotation of a rotational drive device (30) to a drive force in the axial direction. The housing (10) includes a tubular first bush (51) disposed at a first end (10a) and a tubular second bush (52) at a second end (10b). Each bush (51, 52) is slidably engaged to an outer periphery of the rod (21) and supports the rod (21) to be movable in the axial direction. A rod supporting rigidity of the first bush (51) is lower compared to that of the second bush (52). The first bush (51) is arranged with an elastic body (51b) that deforms in a radial direction of the rod (21). The second bush (52) is arranged with an inner periphery protrusion (52a) at which the rod (21) tilts.

Disclosed is a humidifier and home appliance having a structure with an air inflow path formed in a water tank separately from a water supply inlet and configured to prevent noise due to air bubbles during water supply to a water reservoir from the water tank, and a structure configured to block the air inflow path in order to prevent water from flowing into the air inflow path during replenishment of water to the water tank.

The invention discloses a refrigerator. The refrigerator comprises a storage chamber and an evaporator chamber located on the lower side of the interior of the storage chamber. The evaporator chambercomprises an evaporator and a heater. A water catcher is arranged at the bottom of the evaporator chamber. The evaporator comprises a coiled pipe and a plurality of rows of fins sleeved on the coiledpipe. The bottom edges of the row of the fins on the bottommost side are bent to form bending parts. The heater is arranged below the bending parts. The bending parts are provided with ventilation parts. Defrosting water generated by the evaporator does not pass through the heater along at least one ends of the bending parts and directly flows into the water catcher. According to the refrigerator,the bending parts of the fins form a blocking plate structure, the blocking plate structure guides defrosting water into the water catcher from at least one side of the bending parts, prevents defrosting water from dripping onto a heating wire and causing abnormal noise and can also prevent ice blocks from falling off during the defrosting period and prevent the situation that the ice blocks falloff, are vaporized speedily and generates noise. The refrigerator is simple in overall structure. There is no need to additionally arranged other shielding components between the evaporator and the heater. The refrigerator is not limited by the installation space of the evaporator. The heater is located at the bottom of the evaporator, and the defrosting efficiency is high.

The invention provides a shock absorption adjusting device and a refrigerator with the shock absorption adjusting device. The shock absorption adjusting device comprises a shock absorption layer and an adjusting foot shaft and further comprises an adjusting foot mechanism capable of moving up and down along the adjusting foot shaft to enable the shock absorption layer to be in contact with or separated from the ground. According to the shock absorption adjusting device and the refrigerator with the shock absorption adjusting device, the shock absorption layer is additionally arranged at the bottom of an adjusting foot, shock is reduced, and noise, transmitted to the front face of the refrigerator from the bottom, of a compressor is restrained; the inherent frequency of the whole machine ischanged, and abnormal noise generated by resonance of the whole machine is prevented; and the shock absorption layer and the adjusting foot are reasonably assembled, the adjusting foot is slightly changed, and the height adjusting function and the position fixing function of the adjusting foot are not affected.