46results about How to "Reduce howling" patented technology

The invention relates to a brake system of an empty container forklift. The brake system of the empty container forklift comprises a braking oil tank, a gear pump, a prefill valve, a reducing valve, a two-position three-way electromagnetic valve, a gearbox clutch, a first bag type accumulator, a right-foot brake valve, a left-foot brake valve, a shuttle valve, and a stopping brake valve block. A brake oil radiator, the brake oil tank, an overflow valve, a second bag type accumulator and a backpressure valve are additionally arranged in the system. Through adding of the brake oil radiator, the temperature of the whole brake system is effective controlled to be around 60 DEG C, and therefore a sealing part of the whole brake system is well protected. Through adding of the brake oil tank, hydraulic oil which is not suitable for brake friction is not applied to the brake system, and heavy-load wet-type axle brake liquid which is specially prepared is used, so that howling generated by a friction piece and a partition piece in a drive axle is reduced in the process of brake, the whole vehicle brake distance is shortened, and reliability of the whole brake system is improved.

The invention discloses a hydraulic control flow valve, which comprises a main valve core and a main valve body, wherein the main valve core is arranged in a main valve sleeve; the main valve sleeve is arranged in a main valve body stepped hole; an oil outlet sleeve is arranged in the main valve body stepped hole below the main valve sleeve; seal rings are arranged between the oil outlet sleeve and the main valve sleeve as well as between the oil outlet sleeve and the main valve body; a sealing member is also arranged between the main valve core and the main valve sleeve; an overflow valve insert and a pressure compensation insert are assembled on the main valve body through threads in a matching way; a cover plate is arranged above the main valve sleeve and is provided with a pressure gauge and an exhaust valve; and seal rings are arranged between the cover plate and the main valve sleeve and at the junction of the cover plate and a main valve body control oil path hole. The hydraulic control flow valve has the advantages of simple structure, convenience in processing, repair and replacement, stable and reliable speed adjustment, good sealing property, simple pipeline connection,small occupied space, convenience in observation and control of pressure and flow, small squeal during work and small jitter of the main valve core. The hydraulic control flow valve is mainly appliedto a drainage system of a liquid cargo ship and the like.

Disclosed is a wireless MIC system for automatically paring, which comprises a wireless MIC which includes a paring button at its one side and facilitates a connection mode as it is automatically paired with an amplifier by transmitting a paring request signal when the paring button is on, and initializes a connection related information stored in a storing part when the connection mode is cancelled and converts an acoustic signal into a digital audio signal and transmits to the paired amplifier; and an amplifier which facilitates a connection mode as the wireless MIC and the amplifier are paired by setting a transmission and receiving channel of the amplifier and the wireless MIC, and amplifies a digital audio signal from the wireless MIC and outputs in an acoustic form.

The invention discloses a car transmission shaft assembly. The car transmission shaft assembly comprises a hollow shaft tube (5). The inner wall of the shaft tube is uneven. The front end of the shaft tube (5) is connected with a universal joint (1) through a front U-shaped fork (4). The rear end of the shaft tube (5) is connected with a rear axle main reduction end face flange (3) through a rear U-shaped fork (6). Rolled paper (7) is placed along the inner wall surface of the shaft tube (5) in a flat attaching mode. Due to the fact that the rolled paper is placed along the inner wall surface of the shaft tube in the flat attaching mode, when a car runs at high speed, high-speed airflow rapidly enters the shaft tube which rotates at high speed through the side face of the front U-shaped fork from a gap of the welding position, intense friction and impact are not generated between the airflow and the uneven inner wall of the shaft tube any more due to blocking and absorption of the rolled paper in the shaft tube, purr whine noise generated by the high-speed airflow can be greatly lowered, noise is low and can not interfere in listening of a driver to other sounds, and therefore the operation of the driver for normally driving the car can not be affected, and normal running of the car is guaranteed.

The invention relates to a pantograph guide device of a railway vehicle, which comprises an air guide sleeve fixed on the vehicle roof. The air guide sleeve consists of a lateral air guide sleeve, a front air guide sleeve and a rear air guide sleeve; the surroundings of the pantograph are annularly arranged. The lengthwise section of the lateral air guide sleeve is roughly a trapezoid with a narrow top and a wide bottom; the middle lower part of the side of the lateral air guide sleeve which is corresponding to the pantograph is provided with a chamfer angle used for widening the width of thebottom of the air guide sleeve; the lengthwise sections of the front air guide sleeve and the rear air guide sleeve are roughly triangular; the lateral air guide sleeve is a box structure, which is internally and transversely provided with a plurality of first stiffener plates and second stiffener plates; the front air guide sleeve and the rear air guide sleeve are thin-shell structure, which areinternally provided with a plurality of stiffener plates. When the railway vehicle runs at high speed, the air guide sleeve can prevent the influence of air stream to the pantograph, thus reducing thenoise source of the pantograph and effectively reducing noise of the pantograph. The air guide sleeve can be fixed on the vehicle roof alone, thus being free from the influence of the structural formof the pantograph, and suitable for the pantograph of any structural form.

The invention relates to a bone conduction hearing aid device, comprising an in-vitro voice processor which comprises a shell, a metal disk, an electromagnetic vibrator placed in the shell, a microphone and a circuit board, wherein a digital signal processor DSP is integrated and mounted on the circuit board. A vibrator packaging and separating cabin is arranged in the shell. A port is arranged on the right side wall of the shell. The port is communicated with the vibrator packaging and separating cabin. An output end part of the electromagnetic vibrator stretches out of the port and is connected with the metal disk. At least one microphone is arranged on the wall of the shell. The electromagnetic vibrator is arranged in the vibrator packaging and separating cabin. The port is communicated with the vibrator packaging and separating cabin. The output end part of the electromagnetic vibrator stretches out of the port and is connected with the center of the metal disk. According to the device, the electromagnetic vibrator is placed in the vibrator packaging and separating cabin. The sound propagated from the electromagnetic vibrator to the microphone is reduced and attenuated, so the sound propagated form the electromagnetic vibrator to the microphone is reduced or attenuated, and the howling of the bone conduction hearing aid device is greatly weakened.

The invention provides an air outlet device of an automobile air conditioner. The air outlet device comprises a shell, an air door body, an air door adjusting mechanism, an air volume detection deviceand an LED lamp arranged at an air outlet, the shell is provided with a through air duct, an air inlet is formed in the front end of the air duct, and an air outlet is formed in the rear end of the air duct; the air door body is connected with the shell in a pivoted mode at the position of the air inlet and can match the inner wall of the shell to close the air inlet; the air door adjusting mechanism is in power connection with the air door body and used for adjusting the opening degree of the air inlet; the air volume detection device is arranged at the air inlet and used for detecting the air volume inside the air inlet; and the LED lamp is electrically connected with the air volume detection device, and the color change of the LED lamp is controlled according to the air volume detectedby the air volume detection device. The air outlet device of the automobile air conditioner can feed back air volume information to a user in real time, the user can adjust the air volume of the airoutlet conveniently at night, and user experience is improved.

A clutch gear (40) is formed, and several mass dampers (30) are coupled to the clutch gear to split the mode of vibration for the clutch gear during engagement. A lubrication dam is formed between the clutch gear and the mass damper. A receptor is formed in the clutch gear to partially fit the mass damper. An independent claim is included for vehicle transmission clutch assembly.

The invention provides a compact structure of a liquid reservoir and a gas-liquid separator for a refrigeration / air-conditioning system. The structure comprises an inner shell, an outer shell, an air inlet pipe, an air outlet pipe, a liquid supply inlet pipe, a liquid supply outlet pipe and a connection component, wherein the inner shell is fixed in the outer shell through the connection component; a cavity in the outer shell is divided into a liquid storage cavity and a gas-liquid separating cavity; the outer ends of the air inlet pipe and the air output pipe stretch out of the outer shell; the inner ends of the air inlet pipe and the air output pipe stretch into the gas-liquid separating cavity; the air outlet pipe is a U-shaped pipe; the inner port is an inclined port and an oil returnhole and a balanced hole are formed in the inner port; the air inlet pipe is an L-shaped pipe; the inner port of the air inlet pipe and the inner port of the air outlet pipe are arranged in a staggering manner; the outer ends of the liquid supply inlet pipe and the liquid supply outlet pipe stretch out of the outer shell; the inner ends of the liquid supply inlet pipe and the liquid supply outletpipe stretch into the liquid storage cavity; the inner port of the liquid supply inlet pipe is arranged above the inner shell; the liquid supply outlet pipe is an L-shaped pipe; the inner port of theliquid supply output pipe is an inclined port; and the connection component is cylindrical. The compact structure has the advantages of increasing the comprehensive efficiency, utilizing the inner volume in multiple aspects, reducing the system mounting space, reducing the cost of parts and the like.

The present application provides a feedback filter design method, a design device and an earphone, to obtain the transfer function of the secondary channel of the earphone in at least one working state; based on the transfer function of the secondary channel, determine the A nominal system transfer function and a first weighting function of the earphone; a second weighting function is determined based on the noise reduction expectation of the earphone; a second weighting function is determined based on the first weighting function, the second weighting function, and the nominal system transfer function that determines the parameters of the feedback filter. Compared with the design method of the feedback filter in the prior art, the present application determines the parameters of the feedback filter through the transfer function of the secondary channel under various working conditions, so that the earphone remains stable under various working conditions, reducing The appearance of howling enhances the robustness while keeping the noise low.

The assembly (450) has a clutch component e.g. clutch gear (470), rotated with respect to a transmission shaft e.g. output shaft (480). A set of multi-directional mass dampers (460) i.e. sprung mass dampers, is coupled to the clutch component with inner diameter, and alters a mode of vibration for the clutch component during clutch engagement, where the mass dampers are separated by ninety degrees on the clutch component. The mass dampers applies localized force to the clutch component with arc degree less than or equal to five degrees. An independent claim is also included for a method for manufacturing a transmission clutch assembly with reduced squawk during engagement.

The invention discloses an asymmetrical high-frequency sound wave controller with an angle adjustable. The asymmetrical high-frequency sound wave controller with the angle adjustable comprises a conic core a, a conic core b, a shell a, two baffles x and two baffles y. The conic core a is a cone with a concave-convex surface and the conic core b is an irregular circular truncated cone which is obtained in the mode that the circular truncated cone is symmetrically cut along the diameter of the end face of the larger end in an inclined mode. The irregular circular truncated cone is composed of a semicircular truncated cone x with a concave surface and a semicircular truncated cone y with a convex surface. The semicircular truncated cone x is cut in an inclined mode so that two symmetrical 1 / 4-oval surfaces x can be obtained and the semicircular truncated cone y is cut in an inclined mode so that two symmetric 1 / 4-oval surfaces y can be obtained. The shell a is arranged on the conic core a in a sleeved mode, the small diameter end and the large diameter end of the shell a correspond to the conic node position and the conic bottom position of the conic core a respectively. A high-pitch inlet of the asymmetrical high-frequency sound wave controller is a circular plane, high pitch passes through a gap between the conic core a and the shell a and then is emitted and makes contact with natural space, and the baffles only guide the high pitch in part of the natural space, so that an outlet becomes a C-shaped stereoscopic face facing upwards, forwards and downwards, and therefore the work efficiency of a voice box is high.