10results about How to "Reduce flow noise" patented technology

The utility model relates to noise isolation device technical field, concretely relates to noise isolation and noise reduction protection integrated device, including a plurality of mutual splicing's protective plate, and the protective plate is composed of the outer frame board of setting at the outside and the sound insulation layer of setting at the central position department of outer frame board, and the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the sound insulation layer and the outer frame board, the sound absorption layer is arranged between the

The low-noise dust collector comprises a shell and a fan assembly, the shell is provided with a closed cavity, the front end wall of the closed cavity is provided with an air inlet structure, the rear end wall of the closed cavity is provided with a plurality of air outlet holes, and a partition grid plate is arranged in the closed cavity to divide the closed cavity into a fan cavity located on the front portion and a transition cavity located on the rear portion. A plurality of isolation holes are densely distributed in the separation grid plate, and the fan assembly is fixedly installed in the fan cavity. Air flow exhausted by the fan assembly sequentially passes through the isolation holes of the separation grid plate, the transition cavity and the air outlet holes of the rear end wall, so that the air flow flows out in a contraction-release-contraction mode, and noise is greatly reduced.

A two-way self-adaptive throttle valve at least comprises two three-way structures and two one-way self-adaptive throttle valve bodies or valve elements, and the two one-way self-adaptive throttle valve bodies or valve elements are fixedly connected in parallel in the reverse direction through the two three-way structures to form an integral structure with two connectors. The one-way self-adaption throttling valve or valve element at least comprises a valve body, a valve seat, a valve needle, a valve needle spring, an adjusting spring and a limiting block, the valve seat and the limiting block are arranged in the valve body, the valve needle spring, the valve needle, the adjusting spring and the like are sequentially arranged in the valve body between the valve seat and the limiting block, the valve needle spring is arranged on the outer side of the front section of the valve needle in a sleeving mode, and the limiting block is arranged in the valve body. The adjusting spring is arranged between the valve needle and the adjusting limiting block, and the valve needle can axially move in the valve body under the action of force to close or open the valve port. According to the utility model, the variable-flow two-way throttling can be realized, the damping effect of the valve needle spring and the adjusting spring is realized, the valve needle is small in vibration and high in reliability, and the control problem of the throttling mechanism can be simplified and automated.

The utility model discloses a washboard structure for preventing violent shaking of oil, which comprises an oil tank, the bottom of the oil tank is fixedly connected with a washboard main body, the upper surface of the washboard main body is fixedly connected with the inner top of the oil tank, the bottom of the washboard main body is provided with a plurality of flowing ports, and the flowing ports are communicated with the oil tank. A plurality of rotating holes are formed in one side of the washboard body, a rotating groove is formed in the inner wall of each rotating hole, a rotating structure is arranged in each rotating groove, buffering structures are arranged on the sides, away from each other, of the washboard body, and each rotating structure comprises a rotating ring rotationally connected into the corresponding rotating groove. By arranging the rotating ring, the rotating sleeves, the stainless steel fan blades, the supporting shaft and the like, oil flows into the rotating sleeves, and when the oil flows through the stainless steel fan blades, the stainless steel fan blades drive the rotating ring, the rotating sleeves and the supporting shaft to rotate, so that vortex is formed by the oil, the energy dissipation efficiency is improved, and meanwhile flowing noise is reduced.

This invention proposes a ducted propeller, comprising a tube body, a propeller body, and protruding units. At least one groove is formed on the inner wall of the tube body. The propeller body is disposed within the tube body and located at one end of the tube body. The groove is spirally arranged around the central axis of the tube body. Several protruding units are continuously and uniformly arranged within the groove along its spiral line. Adjacent protruding units are connected end-to-end. By forming a spiral-shaped groove on the inner wall of the tube body, the propeller wake is rectified. As the wake flows towards the outlet at the free end of the tube body, the circumferential velocity component of the wake gradually decreases under the action of the groove. This results in the circumferential velocity component at the wake outlet being significantly smaller than that at the wake inlet, thereby improving propulsion efficiency and reducing noise.

The adjustable bidirectional adaptive throttle valve at least comprises a first valve body, a second valve body, a first valve seat, a first valve needle, a first valve needle spring, a first adjusting spring, a first adjusting limit block, a second valve seat, a second valve needle, a second valve needle spring, a second adjusting spring and a second adjusting limit block, the pre-tightening force of the corresponding spring is adjusted by the first adjusting limit block and the second adjusting limit block to control the force opening state of the corresponding valve needle, the first valve needle and the second valve needle can move axially in the valve body under the action of force to reduce or enlarge the flow area of the valve port. The adjustable bidirectional adaptive throttle valve is used to realize adjustable variable flow throttling, the first valve needle and the second valve needle have small oscillation under the damping effect of the corresponding valve needle spring and adjusting spring, the bidirectional throttling is high in reliability, and the control problem of the throttling mechanism is simplified and automated.

The invention discloses a fresh air structure and an air conditioner, and the fresh air structure comprises a shell which is provided with an outdoor inlet and an outdoor outlet; the purification assembly is arranged in the shell and comprises a purification body and a flow guide plate, the outdoor inlet and the outlet are located in the two opposite sides of the purification assembly respectively, and the flow guide plate is connected with the purification body and used for guiding airflow of the outdoor inlet to the side, away from the outlet, of the purification body. According to the fresh air structure, the flow guide plate is arranged on the purification assembly in the shell, airflow is guided to the side, away from the outlet, of the purification body, flowing of the airflow can be better guided, flowing of the airflow is smoother, and flowing noise of the airflow is lowered; and the airflow entering the shell can be guided to the side, away from the outlet, of the purification body, so that the airflow flows to the outlet after being purified by the purification body, the cleanliness of the airflow flowing out of the fresh air structure is guaranteed, and the health of a user is guaranteed.

The utility model relates to the technical field of connecting pipelines, and discloses a DN15 double-screw sizing pipe which comprises a pipe body, connecting nuts are fixedly connected to the two ends of the pipe body respectively, threads are arranged on the inner side of the connecting nut at one end, a pipe core is fixedly connected to the inner side of the connecting nut, threads are arranged on the outer side of the pipe core, and the pipe core is fixedly connected with the pipe body. A sealing rubber ring is fixedly connected to the inner side of a cavity formed by the pipe core and the connecting nut, a reinforcing butt joint mechanism is fixedly connected to the top of the connecting nut, and a noise reduction flow slowing mechanism is fixedly connected to the inner side of the pipe body. According to the utility model, the clamping sliding rod compresses the clamping reset spring and slides in the fixed connecting block I through external force, and the clamping sliding rod is rotated to enable the limiting short column to be clamped into the transverse clamping groove, so that automatic clamping reinforcement is realized, the connecting stability is enhanced, the connecting part is effectively prevented from loosening, rotating and leaking, the safety and reliability of a pipeline system are improved, and the service life of the pipeline system is prolonged. Mounting and dismounting are convenient, and the construction efficiency is improved.

The application discloses a kind of high-efficiency low-noise elbow based on section shape and steering radius joint control, the inlet end surface and outlet end surface of the elbow are both elliptical structure, and the inlet elliptical section parameter is equal to its outlet elliptical section parameter;Elbow steering angle is 90°;The elliptical section eccentricity of the described is valued (0,1), and the steering radius of elbow is valued in the range of 0.5D1~2D1.Elbow design method is under the condition of keeping the cross-sectional area of elbow unchanged, by controlling the parameters when the cross section of elbow changes from circular to elliptical, i.e., the eccentricity e of cross-sectional ellipse and the steering radius R of elbow, the sound pressure intensity of flow noise obtained by simulation calculation, pressure fluctuation intensity and entropy production are joint optimization objectives, the elbow is optimized and iterated, a set of optimal high-efficiency low-noise elbow design parameters are found to realize the application requirements of less energy loss, weak pressure fluctuation intensity and low noise.

The utility model relates to a mute centrifugal fan, and belongs to the technical field of fans, the mute centrifugal fan comprises a fan shell, an air inlet cover is arranged at an air inlet of the fan shell, the air inlet cover is of a cavity structure and is filled with a sound absorbing material, and a plurality of first through holes allowing sound waves to enter the air inlet cover are formed in the air inlet cover; the air inlet cover is used for covering the air inlet so as to limit the path, perpendicular to the air inlet, of sound waves and airflow, the air inlet of the fan shell is provided with an annular sleeve along the inner wall of the air inlet, the annular sleeve is provided with a first mounting groove used for being filled with sound absorption materials along the circumferential face of the annular sleeve, and the annular sleeve is provided with a first sealing plate used for covering a notch of the first mounting groove along the circumferential face of the annular sleeve. The first sealing plate is provided with a plurality of second through holes allowing sound waves to enter the first mounting groove, the peripheral face of the air inlet cover and the first sealing plate jointly define an air inlet space, and the sound waves can be reflected between the peripheral face of the air inlet cover and the first sealing plate in a reciprocating mode. The sound energy attenuation efficiency is improved, and then the noise reduction effect is improved.