32results about How to "Reduce fluid noise" patented technology

A modal attenuator may include an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment, a perforated screen disposed within the attenuator body and spaced apart from the attenuator body to form an annular space, and a plurality of rings disposed between the perforated screen and the attenuator body. When fluid flows through the modal attenuator, sound waves pass through the perforated screen and are reflected back by the plurality of rings to disrupt other sound waves, thereby reducing fluid noise in the modal attenuator.

In an axial flow fan, for reducing fluid noise and further reducing the noise by suppressing solid-conveyed noise (structure-borne noise) generated by the vibration of an electric motor or the like, the axial flow fan is equipped with a propeller, a motor for driving the propeller, and a venturi portion disposed on the outer circumference side of the propeller and provided on its inner circumferential side with a bellmouth through which an air flow generated by the revolution of the propeller passes, wherein the bellmouth has an intake portion whose diameter contracts in a curved shape in the direction of the air flow, a cylindrical portion having a cylindrical shape, and a discharge portion whose diameter slantingly expands in the direction of the air flow.

The invention provides an elevator device. The elevator device has a rectification structure capable of reducing air flows entering between the front part of the compartment and an elavator shaft during an elevation process of the compartment without interferring with the functions of the elevator. The elevator device is characterized by comprising a compartment and a rectification structure arranged in the compartment; the compartment has a front side having a door, a back side opposite to the front side, two sides between the front side and the back side, and a top side and the bottom side which are connected to the back side and the pair of sides; the rectification structure has a front panel arranged on the top of the compartment and connected to the front side, a pair of side panels which are arranged on the top surface of the compartment and are connected to the side surfaces; and the end of the side opposite to the end connected to the top surface of the compartment on the front panel has a breach.

The invention discloses a rotary compressor and a rotor assembly thereof. The rotor assembly includes: a rotor with a shaft hole; an upper balance weight and a lower balance weight respectively arranged on the top and bottom of the rotor, and the upper balance weight and the lower balance weight respectively have shaft holes coaxial with the shaft hole; The first circular hole and the second circular hole, wherein each of the upper balance weight and the lower balance weight includes: an outer cylinder; an inner cylinder, the inner cylinder intersects the outer cylinder and is connected to the outer cylinder The protruding direction is opposite; the upper end surface, the upper end surface is set on the top of the outer cylinder and the inner cylinder; the lower end surface, the lower end surface is set on the bottom of the outer cylinder and the inner cylinder. According to the rotor assembly of the present invention, when used in a rotary compressor, it can reduce the rotational speed fluctuation of the rotary compressor to reduce vibration and noise, and effectively reduce the fluid noise inside the shell of the rotary compressor and improve its mechanical efficiency. Moreover, the production process is simple and the reliability is high.

The invention provides a low-noise adjusting valve with a pre-starting structure. The low-noise adjusting valve with the pre-starting structure comprises a three-way valve body, an upper cover plate, a valve rod, a pre-starting plunger, a pre-starting valve seat, a valve head and a large-flow throttling element, wherein a pressing piece is mounted in the center of the upper cover plate; an end of the valve rod is fixedly connected with the upper end of the pre-starting plunger; the lower end of the valve head is clamped at the bottom of the three-way valve body; the middle of the valve head is fixedly connected with a baffle; the pre-starting valve seat is fixedly mounted at the bottom end of the valve head; the baffle and the pre-starting valve seat are positioned in the valve head; a narrow slit flow channel is further formed in the valve head; a pressure spring sleeves the valve rod; one end of the pressure spring is fixedly connected with the pressing piece while the other end of the pressure spring is fixedly connected with the baffle; at least one annular groove is formed in the lower end of the pre-starting plunger; at least one annular projection is arranged at the upper end of the pre-starting valve seat; and after each annular groove is matched with the corresponding annular projection, a labyrinth type pre-starting structure is formed. The initial lifting force of the valve can be reduced effectively, fluid noises under the condition of small opening are reduced, turbulent flow collision is relieved, and flow capacity under the condition of large opening is improved.

The invention provides a gas flow-splitting / converging device with a noise eliminating function used for a compressor unit refrigerating system. The gas flow-splitting / converging device comprises an outer wall shell, an air inlet / an air outlet, at least two air outlets / air inlets and a flow-splitting unit, wherein the flow-splitting unit is provided with an internal flow channel the inner wall of which is smooth. The gas flow-splitting / converging device is characterized by further comprising a noise elimination unit, wherein the noise eliminating unit and the internal flow channel as well as the outer wall shell form an integral type structure. The gas flow-splitting / converging device with the noise eliminating function can be simultaneously or independently applied in the compressor unit refrigerating system. A gas flow-splitting device with the noise eliminating function is mounted between a compressor and a condenser; and a gas flow-converging device with the noise eliminating function is mounted between the compressor and the evaporator. With the adoption of the gas flow-splitting / converging device, the function of the noise eliminating unit can be effectively utilized, fluid noise of the compressor unit refrigerating system can be attenuated to the greatest extent, and meanwhile, the structural arrangement of a pipeline of the compressor unit can be simplified, and no obvious additional pressure drop is generated.

A swing rotor compressor comprises a swing rotor, an eccentric axle, a front end cover, an air cylinder, a guide rail and a back end cover, wherein the swing rotor comprises a rolling ring and a swing rod; the eccentric axle comprises a spindle and an eccentric wheel; an exhaust hole is formed in the rolling ring and is close to one side of the swing rod; an exhaust cavity is formed in the eccentric wheel and is connected with or disconnected from the exhaust hole in the rolling ring periodically during rotation of the spindle; a flow passing hole is formed in the back end cover, and the exhaust cavity is always communicated with the flow passing hole in the back end cover during rotation of the spindle. No suction valve and exhaust valve are arranged, and compared with a traditional swing rotor compressor, the swing rotor compressor is higher in efficiency, lower in noise and better in speed change characteristic and durability.

This invention publicized one kind of axial triangle to pass the trough type pure water hydraulic pressure throttle valve. It is loaded with the valve casing among the valve body, the valve body lower extremity and a side separately opens has the water inlet well valve casing lower extremity hole and a side face, Yu Fati a side water outlet connects; On the valve body is loaded with the flange, the throttle valve core installs in the valve body, in the flange, under the throttle valve core separates has the axial triangle to pass the trough the throttle valve port and to the valve casing coordination, outside on the flange throttle valve core is loaded with adjusts the handwheel, the flange upper extreme is loaded with the compression nut. This invention uses the axial triangle to pass the trough -like throttle valve port form, may realize the micro adjustment; In the structure uses increases the valve casing the mushroom valve structural style, may realize zero to divulge; Uses the O seal packing collar to add the elastic ring and the U seal skeleton adds the elastic ring safely the seal form, the seal is reliable, suits works under the center high pressure aqueous medium environment.

The invention discloses a refrigerator and an air duct plate thereof. Among them, the refrigerator includes: a box body with a refrigeration compartment; a door body installed on the box body for opening or closing the refrigeration compartment; an air duct arranged in the box body, and the air duct includes The inner wall of the air duct plate is provided with sound-absorbing blind holes spaced apart from each other. According to the refrigerator of the present invention, by setting the sound-absorbing blind hole on the inner avoiding surface of the air channel plate, the noise can be resonated in the peak frequency band, thereby improving the silencing coefficient and acoustic impedance of the air channel plate, and increasing the sound absorption bandwidth. In addition, the sound-absorbing blind hole is used to replace the sound-absorbing cotton on the inner avoiding surface of the air channel plate to reduce the fluid noise generated when the air flow passes through the air channel plate, reducing the secondary noise caused by the sound-absorbing cotton, and effectively solving the problem. The ice blockage of the air duct caused by the water absorption of the sound-absorbing cotton reduces the production cost and improves the long-term operation reliability of the product.

A fan guard which reduces fluid noise while holding the conventional function for blocking intrusion of a hand of a person or a foreign matter. In a fan guard (200) constituted of a plurality of crosspieces (110) and arranged at an outlet (6) of an engine driven heat pump (1) having a fan (5), the crosspieces (110) are formed by continuing unit shapes (110a) bending or curving relative to the reference line (S) for constituting the crosspieces (110) on the fan guard (200). The unit shape (110a) is formed to have a wavy shape, for example.