22results about How to "Reduce flow noise" patented technology

The invention discloses an energy system based on green carbon cycle and an operation method and a control method thereof, and the energy system based on green carbon cycle comprises a methanol energy supply module, a methanol regeneration module and a carbon dioxide heat pump energy storage module; the methanol energy supply module comprises a methanol internal combustion engine and a first power generator, and the methanol regeneration module comprises a carbon dioxide capture treatment unit, a methanol synthesis unit and an electrolyzed water unit; according to the system, the park energy system with the methanol internal combustion engine as the core is adopted, the transportation cost and the storage risk of fuel are reduced on the basis of considering environmental protection, low carbon and flexible and reliable energy supply, supercritical carbon dioxide is introduced to serve as a circulating working medium, the advantages of high energy density and low viscosity of the supercritical carbon dioxide are fully explored, and the energy efficiency is improved. The heat exchange efficiency is remarkably improved, meanwhile, the size of the heat exchanger is reduced, flowing noise is lowered, the heat exchanger is more suitable for energy supply of a user side, and a new choice is provided for planning and configuration of a park energy system.

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.

The invention discloses an active control method for inhibiting unsteady flow excitation of an underwater vehicle, and relates to the technical field of turbulent flow control, and the method comprises the steps: determining the position of an initial separation point of a horseshoe vortex at the front edge of a combination part of a surrounding shell and a main hull; an arrow-shaped hole is formed in the position of the initial separation point, and suction flow control is applied through the arrow-shaped hole; and comparing the flow characteristics of the joint part of the enclosure and the main boat body under different arrow-shaped hole sizes and flow suction speeds, selecting the arrow-shaped hole sizes and flow suction speeds with the optimal control effect, and carrying out active flow suction control at the initial separation point position so as to inhibit the unsteady flow excitation of the underwater vehicle. According to the method, the vortex structure and pulsating pressure of the underwater navigation body can be greatly inhibited, the external streaming of the joint part of the main body and the auxiliary body is improved and optimized, and the purpose of reducing flow-induced noise is achieved.

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 oxygen generators, in particular to a compressor module and an oxygen generator. The compressor module comprises a base, a first compressor, a second compressor, a first hush pipe and a second hush pipe. An air port is formed in the base. The first compressor and the second compressor are both arranged on the base; an air outlet of the first hush pipe is in sealed connection with an air inlet of the first compressor, an air outlet of the second hush pipe is in sealed connection with an air inlet of the second compressor, and the first hush pipe and the second hush pipe are located in the base; and an air inlet of the first silencing pipe and an air inlet of the second silencing pipe are respectively communicated with external air through the air ports. According to the arrangement, the overall noise generated when the compressor module and the oxygen generator are used is reduced, rest and recovery of a user in the physical therapy and treatment process are facilitated, and the use experience feeling of the user is improved.

The invention provides an air conditioning system and a control method and device thereof, a storage medium and a program product, the air conditioning system comprises a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first throttling device, a second throttling device, a third throttling device, a first four-way reversing valve, a second four-way reversing valve and a flash tank; the control method comprises the steps that when the air conditioning system operates, whether the temperature difference value between the indoor environment temperature and the set temperature is larger than or equal to a preset temperature difference threshold value or not is judged; if it is judged that the temperature difference value is smaller than the preset temperature difference threshold value, the predicted noise of a third throttling device is determined according to the flow path middle temperature of the second heat exchanger and the flow path middle temperature of the third heat exchanger; and according to the predicted noise, the opening degree of a first throttling device and the opening degree of a second throttling device are adjusted, or the rotating speed of an outer draught fan and the opening degree of the second throttling device are adjusted. According to the scheme, the flow noise of the electronic expansion valve can be reduced while the energy efficiency is considered.

This application discloses a fluid pump, including a pump casing and an impeller. The pump casing has a receiving cavity, a first port, and a second port, both of which communicate with the receiving cavity. The impeller includes a connecting component and multiple blades. The connecting component is rotatably disposed within the receiving cavity. The multiple blades are radially connected to the connecting component around its rotation axis, and a flow guide channel is formed between adjacent blades. The flow guide channel has an inlet located near the rotation axis and an outlet located away from the rotation axis. The inlet communicates with the first port, and the outlet communicates with the second port through the receiving cavity. Along the direction away from the rotation axis, the blades include at least one arcuate section and a straight section, with the straight section located at the tail of the blade. This application solves the problem of poor noise reduction in existing fluid pumps.

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 invention discloses a damping connecting pipe for a steam inlet and exhaust pipeline. The damping connecting pipe comprises a first pipe body, a second pipe body and an elastic connecting piece, the first pipe body and the second pipe body have the same pipe diameter and are coaxially arranged, and a limiting gap is reserved between the end part of the first pipe body and the end part of the second pipe body; the elastic connecting piece is of an annular elastic structure capable of axially deforming and radially deforming and is arranged outside the first pipe body and the second pipe body in a sleeving mode. And the elastic connecting piece is connected with the outer walls of the first pipe body and the second pipe body respectively. The invention further provides a design method of the steam exhaust pipeline cabin-penetrating connecting joint and the vibration reduction connecting pipe. The vibration reduction connecting pipe has the beneficial effects that the elastic connecting piece capable of axially deforming and radially deforming is designed, when equipment vibrates, the radial deformation of the elastic connecting piece is used for reducing vibration of radial vibration, the axial deformation of the elastic connecting piece is used for reducing vibration of axial vibration, and the vibration reduction performance of the whole vibration reduction connecting pipe 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 present invention provides a refrigerator with a cooling chamber located at the lower inner part of a freezing liner, comprising a box body, the box body comprising a storage liner, the storage liner comprising a freezing liner located at the lower part, the lower inner part of the freezing liner defining a cooling chamber, the storage liner defining a storage compartment located above the cooling chamber, an evaporator disposed in the cooling chamber, the cooling chamber occupying the lower space inside the freezing liner, which can effectively raise the position of the freezing chamber located above the cooling chamber in the freezing liner, reduce the degree of bending when the user takes or places items in the freezing chamber, and improve the user experience. An axial flow fan is located in the cooling chamber and is disposed at the rear side of the evaporator in a forward tilted manner to reduce the height of the axial flow fan, reduce the space occupied by the cooling chamber, and thereby increase the space in the freezing liner located above the cooling chamber.

The valve body assembly comprises a valve body and a flow guide valve seat, the valve body is provided with an upper opening, a side face connector and a lower connector which are oppositely arranged, the flow guide valve seat is provided with an upper opening and a lower center opening which are oppositely arranged, the lower center opening of the flow guide valve seat is a valve hole, and the valve hole is communicated with the side face connector. At least one eccentric flow guide hole is formed in the side face of the upper portion of the flow guide valve seat, the bottom of an inner cavity of the flow guide valve seat is funnel-shaped, the flow guide valve seat is arranged in the valve body, and the lower portion of the flow guide valve seat is inserted into or penetrates through a lower connector of the valve body and welded to the valve body. According to the electronic expansion valve adopting the technical scheme, the reliability and stability of the electronic expansion valve can be improved, fluid does not directly impact the valve needle when entering the valve body assembly, the fluid spirally flows through the valve port, vibration of the valve needle is reduced, and noise of the fluid in the valve body is reduced; the fluid flows reversely and enters the valve body through the valve hole, the channel is gradually expanded, flowing howling noise is reduced, and therefore the problem that in the prior art, an electronic expansion valve is large in noise can be effectively solved.

The present invention provides a refrigerator with a cooling chamber located at the lower inner part of a freezing liner, comprising a box body, the box body comprising a storage liner, the storage liner comprising a freezing liner located at the lower part, a cooling chamber defined at the lower inner part of the freezing liner, a storage compartment located above the cooling chamber defined in the storage liner, an evaporator arranged in the cooling chamber, the cooling chamber occupies the lower space inside the freezing liner, and can effectively raise the position of the freezing chamber located above the cooling chamber in the freezing liner, reduce the degree of bending when the user takes and puts items in the freezing chamber, and improve the user experience. A cross-flow fan is located in the cooling chamber and is arranged horizontally behind the evaporator, and is configured to cause the cold air flow cooled by the evaporator to flow to the storage compartment.

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.

The present invention relates to a method for predicting the transition position of a hydrofoil boundary layer, and belongs to the technical field of hydrodynamic research. The method for predicting the transition position of a hydrofoil boundary layer comprises the following steps: S1, obtaining a hydrofoil discrete grid; S2, solving the hydrofoil laminar flow field; S3, calculating the local wall tangential velocity; S4, obtaining the growth rate of the instability frequency disturbance; S5, obtaining the amplification factor cloud map of small disturbances of different frequencies; S6, predicting the transition position of the hydrofoil boundary layer. The method for predicting the transition position of a hydrofoil boundary layer can draw a vertical grid with a curved surface shape of a leading edge and a trailing edge through the curved surface adaptive vertical grid technology, thereby improving the prediction accuracy of the transition position; by respectively analyzing and calculating the data of the suction surface and the pressure surface, the transition positions of the suction surface and the pressure surface are obtained, which is suitable for asymmetric airfoils and airfoils with an angle of attack, and can accurately predict the transition position of the hydrofoil under complex conditions.

The utility model belongs to the technical field of compressors, and particularly discloses a rotation-stopping noise-reducing oil pumping device and a compressor. The rotation-stopping noise-reducing oil pumping device comprises a machine body, a crankshaft, an oil suction pipe, an oil suction pipe core and a fixing piece, the rotation-stopping noise-reducing oil pumping device is applied to a compressor, the crankshaft drives the oil suction pipe to rotate so as to drive refrigerating machine oil in an oil pool to rotate, the oil suction pipe core is connected with a machine body through the fixing piece and does not rotate, the rotation-stopping blade at the lower end of the oil suction pipe core stops the refrigerating machine oil from rotating, and the rotating speed of the refrigerating machine oil is reduced; the flowing noise of refrigerating machine oil is reduced; the rotation stopping blades stop rotation of refrigerating machine oil so as to reduce centrifugal force, the descending amplitude of the oil liquid level in the center of the oil pool is reduced, and therefore on the premise that the oil injection amount is reduced, the enough oil liquid level height can still be kept, and the product cost is reduced. Meanwhile, due to the low oil level, the situation that refrigerating machine oil splashes to the rotor and the stator of the motor is reduced, and impact noise is lowered.

The utility model provides a magnetic suspension draught fan which comprises a magnetic suspension draught fan body, the magnetic suspension draught fan body is installed on a supporting frame, an air inlet pipe is arranged at the input end of the magnetic suspension draught fan body, an air outlet pipe is arranged at the output end of the magnetic suspension draught fan body, and the magnetic suspension draught fan body is connected with a driving motor. Silencing inner sleeves are arranged in the air inlet pipe and the air outlet pipe, and sound insulation outer sleeves are arranged on the outer side of the air inlet pipe, the outer side of the air outlet pipe and the outer side of the driving motor. Through the arrangement of the silencing inner sleeve, the flowing noise of airflow in the air inlet pipe and the air outlet pipe can be reduced, and the sound insulation outer sleeve can reduce the rotation noise of the driving motor and further reduce the operation noise of air inlet and air outlet of the air inlet pipe and the air outlet pipe. According to the magnetic suspension fan, noise and vibration generated when the magnetic suspension fan body works can be effectively reduced, and the operation stability and reliability of the magnetic suspension fan body are improved.