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39results about How to "Improve total pressure efficiency" patented technology

Centrifugal compressor model

The invention discloses a centrifugal compressor model. The centrifugal compressor technology in China still need be improved continuously so that the operation stability and efficiency of a compressor can be enhanced. The centrifugal compressor model comprises an impeller, a blade diffuser, a bent way and a backflow unit. The blade diffuser is arranged at an outlet of the impeller. Diffuser blades of the blade diffuser are skewed blades, that is, the sides, close to a diffuser wheel cover, of outlets of the diffuser blades are bent to form outlet flow stabilizing blades. An outlet of the blade diffuser is communicated with the bent way. Circular grooves are formed in the outer wall of the bent way. Resistance reduction grooves are formed in blade pressure faces and suction faces of backflow unit blades of the backflow unit, and rectangular channels are formed in blade outlets of the backflow unit blades. According to the centrifugal compressor model, structures of diffusers, bent ways and backflow units of prior centrifugal compressor models are improved, enhancement of operation efficiency and enhancement of operation stability of the centrifugal compressor model are guaranteed, and a computational formula of energy gradient function values in the diffuser is raised.
Owner:嘉兴芸诗娇电子商务有限公司

Efficient high blast pressure range hood

The invention discloses an efficient high blast pressure range hood. The efficient high blast pressure range hood is characterized in that: a draught fan is arranged in a range hood outer shell; the outer shell of the draught fan is connected and sealed with the range hood outer shell; a lead air channel and a mold cavity are connected and assembled to form the outer shell of the draught fan; an air inlet and an air outlet of the draught fan are on the same axis; a motor of the draught fan is fixed in the outer shell of the draught fan; the motor drives a wind wheel connected with a motor shaft to rotate in the mold cavity of the draught fan; a large-sized LED lamp panel is arranged at the lower part inside the range hood outer shell; the interval between the large-sized LED lamp panel and the range hood outer shell forms an air inlet of the range hood; the distance zone between the large-sized LED lamp panel and the range hood outer shell end face forms an air inlet guide zone of the range hood; a guide air channel is arranged in front of an air inlet end of the wind wheel of the draught fan; a plurality of guide plates are arranged at the back of an air outlet end of the wind wheel; the sectional area of an air inlet of the wind wheel is smaller than the sectional area of an air outlet of the wind wheel; the radial section of each blade of the wind wheel is convex, and the convex direction is the rotating direction of the wind wheel.
Owner:刘永红 +1

Cross-flow fan of composite wire blade impeller

ActiveCN102116314ALift the associativity constraintsIncrease diversityPump componentsPumpsImpellerPublic place
The invention discloses a cross-flow fan of a composite wire blade impeller, which relates to the technical field of electro-machinery. The fan consists of a motor 1, a coupler 2, an impeller, a shell assembly 7 and a bearing seat 8, wherein the impeller consists of a left wheel disc 6, a middle wheel disc 4, a right wheel disc 3, an impeller shaft 9 and more than two blades 5; and the cross section internal mold line of each blade 5 is a composite mold line which is formed in a mode that a section of arc is tangent with an outer circumferential straight-line segment or a section of arc is tangent with an inner circumferential straight-line segment. The fan has the characteristics that: the total pressure efficiency is greatly improved, the noise is obviously reduced compared with that of a sound level A, and the like, is suitable for cooling radiation of various types of equipment, ventilation of rooms, public places and vehicles, constant temperature and drying machines, room cooling and heating equipment and household electrical appliances such as a freezing and showing cabinet, a cool air fan, a warm air blower, an electrical fireplace, an air curtain machine, an embedded oven and the like.
Owner:深圳市科力尔运动控制技术有限公司

Dynamic prewhirl and axial push type hydrocyclone

The invention relates to a dynamic prewhirl and axial push type hydrocyclone which is composed of a medium prewhirl part and a hydrocyclone separating part. The invention is characterized in that materials are fed along the axial direction, a turnstile is used for prewhirl, the axial dimension of the turnstile is short and is not easy to vibrate; and the turnstile also has the function of boosting pressure, the pressure drop of the hydrocyclone is very low; a ring-shaped material axial propelling and accelerating structure is arranged in the outer ring area of the end part of the turnstile so that the axial flow on the periphery of the hydrocyclone is increased, the heavy component on the border can faster reach a heavy liquid outlet, the treatment capacity is increased, the outflow of the unseparated inner medium is reduced, and the axial velocity gradient between layers is reduced, thus avoiding entrainment and blending. A short-circuit-proof baffle cap is arranged at the outlet of light liquid which flows backward so that the feed mixed medium is prevented from flowing to the outlet of light liquid, namely short circuit outflow while the separating efficiency is increased. The invention is applicable to the efficient separation of liquid-solid two-phase with solid particles or oil-water two-phase with solid particles.
Owner:DALIAN UNIV OF TECH

Reversible axial flow fan blade with air blowing grooves

The invention discloses a reversible axial flow fan blade with air blowing grooves. The reversible axial flow fan blade with the air blowing grooves comprises a blade body which is composed of a blade handle and a blade body part, wherein the at least two air blowing grooves are formed in the top of the blade body part in the circumferential direction and are evenly distributed on the surface of the top of the blade, and a wing type pressure surface of the top of the blade and a suction surface are communicated through the air blowing grooves. According to the symmetrical grooves, airflow flowing from the pressure surface to the suction surface is formed in the grooves by means of the high pressure difference between the pressure surface and the suction surface, and vortexes on the suction surface are blown away in the flowing direction. According to the reversible axial flow fan blade with the air blowing grooves, the grooves are formed in the top of the blade body part, in this way, the vortex structure of the suction force on the top of the blade can be maintained, the flowing intensity of loop flow on an inlet and the flowing intensity of the axial vortexes of the suction surface of the top of the blade are reduced, vortex loss and the friction loss are reduced, the total-pressure efficiency of a fan is improved, energy is saved, and consumption is reduced. It is proved through computer numerical values that the total-pressure efficiency of the reversible axial flow fan can be improved by 3%-5%, and the manufacturing cost is reduced by about 10%.
Owner:苏莫明

Axial flow type fire-fighting smoke exhaust fan

The invention discloses an axial flow type fire-fighting smoke exhaust fan. The axial flow type fire-fighting smoke exhaust fan comprises an enclosure and an impeller, wherein the diameter of the impeller is D and the diameter of a motor barrel is d; the enclosure is internally provided with a rectification cover and a rectification body; the rectification cover is fixed at the front end of the impeller; the rectification body is fixed at the rear end of the motor barrel; the rectification cover is semi-spherical, the radius (R) is equal to 0.25-0.35D and the length (L) is equal to 0.1-0.15D; the rectification body is in a butt conical shape and is gradually reduced along the direction of an air outlet; the conical half angle (alpha) is equal to 18-25 degree and the length (L1) is equal to 0.58-0.7d; the end part of the rectification body is in a circular arc shape; the central lines of the rectification cover and the rectification body are overlapped with the axis of the enclosure. According to the axial flow type fire-fighting smoke exhaust fan, the rectification cover and the rectification body are arranged at an air inlet and the air outlet in the enclosure so that the air inlet condition is more complete and the noises of the draught fan are reduced; an airflow channel of the inlet of the axial flow type fire-fighting smoke exhaust fan is formed by the rectification cover mounted in front of the impeller; by the aid of the rectification cover, the flow of the draught fan can be improved by about 10%.
Owner:FOSHAN CITY NANHAI POPULA FAN

Range hood provided with position-sensorless brushless direct-current motor and control method thereof

The invention provides a range hood provided with a position-sensorless brushless direct-current motor. The range hood provided with the position-sensorless brushless direct-current motor comprises a speed setting unit, a CPU microprocessor, a current sampling unit, a counter electromotive force zero-cross detecting unit and a power supply, wherein the speed setting unit, the CPU microprocessor, the current sampling unit and the counter electromotive force zero-cross detecting unit are connected, and the power supply supplies power to the speed setting unit, the CPU microprocessor and an IPM three-phase full-bridge intelligent power amplification unit. The range hood provided with the position-sensorless brushless direct-current motor further comprises the IPM three-phase full-bridge intelligent power amplification unit. The IPM three-phase full-bridge intelligent power amplification unit comprises a kernel unit, a temperature ultralimit monitoring unit and a three-phase invert unit. After conducting A / D conversion and operation on speed adjustment signals input by the speed setting unit, the CPU microprocessor outputs a PWM waveform at a corresponding duty ratio, and the waveform is amplified and isolated by the kernel unit and then drives the three-phase invert unit to amplify the power of the waveform and load the waveform to the motor. The range hood provided with the position-sensorless brushless direct-current motor has the beneficial effects of being simple and reasonable in structure, environmentally friendly and low in power consumption and saves energy.
Owner:ZHEJIANG SHUAIKANG ELECTRIC

Unpowered draught fan with support frames as wing-shaped blades

The invention discloses an unpowered draught fan with support frames as wing-shaped blades. According to an existing unpowered draught fan, strong vortexes will be formed behind plate support frames, and the turbulence degree of a flow field is intensified. The lower-end support frame of the unpowered draught fan is formed by multiple lower-end wing-shaped blades, one end of each lower-end wing-shaped blade is fixed to the bottom of a center shaft, and the other end of each lower-end wing-shaped blade is fixed to the inner wall of an angle-changing pipe diameter; the upper-end support frame of the unpowered draught fan is formed by multiple upper-end wing-shaped blades, one end of each upper-end wing-shaped blade is fixed to a positioning sleeve, and the other end of each upper-end wing-shaped blade is fixed to the inner wall of a cylinder pipe diameter; the positioning sleeve is supported to the center shaft through a bearing; the chord length of the upper-end wing-shaped blades is larger than the chord length of the lower-end wing-shaped blades; the bottoms of the multiple air cutting blades are welded to the end face of the top of the cylinder pipe diameter, and the tops of the multiple air cutting blades and a turbine top plate are welded; and the top of the center shaft is supported into a bearing hole formed in the turbine top plate through a bearing. By means of the unpowered draught fan, flow disturbance of the flow field in the draught fan is improved, vibration of complex turbulence conditions on the draught fan is weakened, and the service life of the draught fan is prolonged.
Owner:嘉兴笼列电子商务有限公司

Volute molded line generation method, volute, fan system and extractor hood

The invention discloses a volute molded line generation method which comprises the following steps: 1) determining at least three positioning points with characteristic meaning of a circle center, wherein the characteristic meaning is volute throat gap positioning, volute height or volute width; 2) taking the circle center as the original point, and determining a volute molded line in a curve fitting way according to coordinates of each positioning point; 3) after determining each positioning point, reversely deducing a coefficient m of Archimedes or log spiral, and fitting a curve graph withrespect to m-Phi by a smooth curve through an m value corresponding to each positioning point, wherein Phi is an included angle formed by the point and a starting radial section of the volute; 4) calculating to obtain values under different values through an Archimedes or log spiral formula: FORMULA, thereby obtaining a corresponding corrected volute molded line. The invention further discloses avolute generated by the method, a fan system applying the volute, and an extractor hood applying the fan system.
Owner:NINGBO FOTILE KITCHEN WARE CO LTD

Multi-wing centrifugal fan

The invention relates to a multi-wing centrifugal fan. The multi-wing centrifugal fan comprises a volute (1), an impeller (2) arranged in the volute (1), and a first motor (4) arranged in the volute (1) for driving the impeller (2) to rotate; and the volute (1) is provided with an intake port (11) and an exhaust port (12). The multi-wing centrifugal fan is characterized in that at least two guide blades (3) are arranged on the inner side of the impeller (2) in the volute (1) at intervals; the guide blades (3) are connected to a rotating shaft (6); an output shaft of a second motor (7) is in driving connection with the rotating shaft (6); the second motor (7) is connected to a bracket (5); the bracket (5) is connected to the volute (1); and the guide blades are spirally arranged corresponding to the center of the intake port (11).
Owner:NINGBO FOTILE KITCHEN WARE CO LTD

Guide device of bidirectional reversible axial-flow fan

ActiveCN104564842AThe aerodynamic characteristics are exactly the sameIncreased static pressure rise capacityPump componentsPump controlImpellerKinetic energy
The invention discloses a guide set of a bidirectional reversible axial-flow fan. The guide set comprises two guide units mounted on two sides of an impeller of the reversible axial-flow fan in anti-symmetry; each guide component is composed of a curved guide plate and at least two planar guide plates, which are mutually overlapped in the axial direction and mutually staggered in the peripheral direction; the cured guide plates of each guide unit are close to a rotating impeller, serving as an inflow side. The guide set has the advantages that leaving-velocity loss caused by integration, on the section of the outlet of the fan, of kinetic energy 0.5 Rho C<u3><2> formed by a rotational velocity component C<u3> of an outlet of the fan can be greatly recycled, the guide set has the aerodynamic characteristic, complete reversibility, to be specific, the fan has completely uniform aerodynamic characteristics no matter when the impeller positively or reversely rotates; by recycling the leaving-velocity loss, whole-pressure efficiency of the fan is increased by 10% to 20%, static pressure rise capacity of the reversible axial-flow fans of same model is greatly improved, the bidirectional reversible axial-flow fan is imparted surging resistance, and a common anti-surging ring structure on existing reversible axial-flow fans is omitted.
Owner:苏莫明

Cyclone air-inlet centrifugal synchronous backward flow fan

The invention discloses a cyclone air-inlet centrifugal synchronous backward flow fan comprising a casing, an air inlet of the casing, an air outlet of the casing, an impeller, a vane disk of the impeller, a vane of the impeller, an axial inlet of the vane of the impeller, an inlet of the air inlet of the casing and an outlet of the air inlet of the casing. The cyclone air-inlet centrifugal synchronous backward flow fan is characterized in that a cyclone inducer is arranged in the air inlet of the casing and comprises a baffling connector and a baffling vane, the baffling connector penetrates through the middle of the cyclone inducer longitudinally along an axial direction from the front to the back, the baffling vane is in the form of a bending structure, the front end of the radial direction of the baffling vane is connected with the baffling connector, the back end of the radial direction of the baffling vane is connected with the side wall of the air inlet of the casing, an inlet of the baffling vane at the front end of the axial direction of the baffling vane points to the inlet of the air inlet of the casing along an axial direction, and an outlet of the baffling vane at the back end of the axial direction of the baffling vane points to the axial inlet of the vane of the impeller slantways along a circumferential direction. In the cyclone air-inlet centrifugal synchronous backward flow fan disclosed by the invention, a cyclone air-inlet principle is adopted, the air-inlet effect of the fan is greatly improved, the flow rate of the fan is increased, the total-pressure efficiency is enhanced, energy resources are saved, and noise is lowered.
Owner:林钧浩

A deep trench filling method

The invention discloses a deep trench filling method, in which deep grooves are filled with epitaxial layers until the epitaxial layers on the side walls of the trenches gather up at the bottom portions, and non-conductive mediums are used to fill the residual gaps in the trenches until the trenches are full. According to the deep trench filling method of the invention, the epitaxial filling is stopped after the bottom portions of the epitaxial layers gather up and before the top portions of the expixial layers gather up, and the epitaxial volumes of the bottom portions and the top portions of the epitaxial layers are kept to be approximate to each other. Since the impurity levels in the filling epitaxial layers are proportional to the volumes, the filling method can reduce the difference in the amount of impurities in the bottom and upper portions of the deep trenches and improve the uniformity of depletion regions so that the differences in the depletion degrees of the trenches at different depths are slight, thereby raising the overpressure resistant efficiency of the depletion regions and improving the overpressure resistant capability of products.
Owner:SHANGHAI HUAHONG GRACE SEMICON MFG CORP

Planar Schottky barrier diode

A planar Schottky barrier diode comprises an N-type heavily-doped silicon substrate, an N-type light-doped epitaxial layer, a P-type heavily-doped loop region, a thin oxide layer, a field oxide layer, a Schottky barrier layer and multiple layers of metal and is characterized in that a P-type light-doped loop region is arranged in the N-type light-doped epitaxial layer outside the P-type heavily-doped loop region, the thin oxide layer is arranged on the P-type heavily-doped loop region and the P-type light-doped loop region, the field oxide layer is arranged on a part of the P-type light-doped loop region and on a part of the N-type light-doped epitaxial layer outside the P-type light-doped loop region, and the Schottky barrier layer is formed on a part of the P-type heavily-doped loop region and on a part of the N-type light-doped epitaxial layer. With the diode disclosed by the invention, the pressure resistant efficiency of the P-type heavily-doped loop region can be effectively improved, the surface field of a Schottkey barrier region can be further enhanced by reducing the junction depth of the P-type heavily-doped loop region, so that the lightning resistance ability of the planar Schottkey barrier is improved, the positive conducted voltage drop can be reduced, and the positive surge capability is improved.
Owner:YANGZHOU GUOYU ELECTRONICS

Powerful pressing method and apparatus for disk spring

The invention discloses a powerful pressing method and apparatus of a disk spring. A disk spring assembly is formed through pairing of a plurality of disk springs and further comprises a guide bar, an upper pressing plate, a return spring and a pedestal, wherein the return spring is disposed in the pedestal, the guide bar penetrates the disk spring assembly and is disposed on the return spring, and the upper pressing plate is in fixed connection with the pedestal. According to the invention, the upper part of the guide bar penetrates the paired disk springs, the lower part of the guide bar is disposed on the return spring and in the pedestal, so the guide bar and the disk springs move downwardly together when the disk springs are powerfully pressed, and the guide bar is pushed to an initial position by the return spring during spring-back of the disk springs, thereby ensuring that the disk springs are fixed in the guide bar; thus, efficiency and safety of powerful pressing of the disk springs are improved, and critical values are obtained.
Owner:上海核工碟形弹簧制造有限公司

Multi-epitaxial super-junction terminal structure and manufacturing method thereof

The invention belongs to the technical field of manufacturing semiconductor devices, and relates to a multi-epitaxial super-junction terminal structure. The multi-epitaxial super-junction terminal structure comprises a first conductive type epitaxial layer. In a terminal region, a plurality of regularly arranged circular second conductive type circular regions are arranged in the first conductivetype epitaxial layer, and adjacent second conductive type circular regions may be adjacent or separated, and a first conductive type region is disposed in an adjacent second conductive type circular interval; and a plurality of second conductive type well regions are disposed on the surface, of the terminal region, close to an active region. By setting the second conductive type circular (or elliptical) regions in the epitaxial layer of the terminal region, configuring the second conductive type circular regions to be adjacent or separated and setting a plurality of second conductive type circular regions for preventing breakdown on the surface close to the active region, the multi-epitaxial super-junction terminal structure enables the device to have higher withstand voltage efficiency inlateral withstand voltage and more complete depletion, thereby reducing the terminal area, reducing the overall chip area, reducing the production cost, and improving the cost performance of the chip.
Owner:WUXI NCE POWER

Axial extraction and lampblack separation integrated range hood

The invention discloses an axial extraction and lampblack separation integrated range hood. The range hood comprises an outer cylinder wall (1), an oil collection tank (2) and a motor (5). The outer cylinder wall (1) and the oil collection tank (2) are coaxially arranged and provided with a cut-through hollow shaft (3). The oil collection tank (2) is arranged at the bottom of the range hood through fixing parts (6). The hollow shaft (3) is further internally provided with an annular impeller (4) connected with the motor (5) arranged in the hollow shaft (3). The annular impeller (4) is composedof arc-shaped blades (41) annularly arranged and a circular cover plate (42) at the top end. The hollow shaft is arranged in the center of the annular impeller. The motor (5) is connected with the circular cover plate (42) through a motor rotary shaft (51) to drive the arc-shaped blades (41) to rotate. The annular impeller rotates rapidly to form the centrifugal effect to extract and discharge lampblack. Compared with the prior art, the axial extraction and lampblack separation integrated range hood has the advantages of being strong in lampblack extraction and suction effect, high in whole-pressure efficiency, simple in structure, convenient to dismantle, clean and install and the like.
Owner:TIANJIN UNIV

Reversible Axial Fan Blades with Blowing Slots

The invention discloses a reversible axial flow fan blade with air blowing grooves. The reversible axial flow fan blade with the air blowing grooves comprises a blade body which is composed of a blade handle and a blade body part, wherein the at least two air blowing grooves are formed in the top of the blade body part in the circumferential direction and are evenly distributed on the surface of the top of the blade, and a wing type pressure surface of the top of the blade and a suction surface are communicated through the air blowing grooves. According to the symmetrical grooves, airflow flowing from the pressure surface to the suction surface is formed in the grooves by means of the high pressure difference between the pressure surface and the suction surface, and vortexes on the suction surface are blown away in the flowing direction. According to the reversible axial flow fan blade with the air blowing grooves, the grooves are formed in the top of the blade body part, in this way, the vortex structure of the suction force on the top of the blade can be maintained, the flowing intensity of loop flow on an inlet and the flowing intensity of the axial vortexes of the suction surface of the top of the blade are reduced, vortex loss and the friction loss are reduced, the total-pressure efficiency of a fan is improved, energy is saved, and consumption is reduced. It is proved through computer numerical values that the total-pressure efficiency of the reversible axial flow fan can be improved by 3%-5%, and the manufacturing cost is reduced by about 10%.
Owner:苏莫明

Unpowered fan whose support frame is an airfoil blade

The invention discloses a non-powered fan whose support frame is an airfoil blade. The existing unpowered fan will form a strong eddy current behind the plate support frame, which intensifies the degree of turbulence in the flow field. The lower end support frame of the present invention is a plurality of lower end airfoil blades, one end of the lower end airfoil blade is fixed on the bottom of the central shaft, and the other end is fixed on the inner wall of the variable angle pipe diameter; the upper end support frame is a plurality of upper end airfoil blades, and the upper end airfoil One end of the blade is fixed on the positioning sleeve, and the other end is fixed on the inner wall of the cylindrical pipe diameter; the positioning sleeve is supported on the central shaft through bearings; the chord length of the upper airfoil blade is greater than the chord length of the lower airfoil blade; The bottom is welded to the top end surface of the cylindrical pipe diameter, and the top is welded to the top plate of the turbine; the top of the central shaft is supported in the support hole opened by the top plate of the turbine through bearings. The invention improves the flow disturbance of the internal flow field of the fan, weakens the vibration caused by the complicated turbulent flow condition to the fan, and prolongs the service life of the fan.
Owner:桐乡市织盟知识产权运营有限公司

Boost flow centrifugal fan

PendingCN107339260AIncrease the maximum static pressureImprove the suction and discharge effectDomestic stoves or rangesPump componentsPhysicsElectric machinery
The invention relates to a boost flow centrifugal fan. The boost flow centrifugal fan comprises a volute (1), an impeller (2) arranged in the volute (1), and a motor (4) arranged in the volute (1) for driving the impeller (2) to rotate; and the volute (1) is provided with an intake port (11) and an exhaust port (12). The boost flow centrifugal fan is characterized in that at least two guide blades (3) are eccentrically arranged on the inner side of the impeller (2) in the volute (1); the guide blades (3) are connected with a bearing (31), and are uniformly distributed at the peripheral edge of the bearing (31); multiple air holes (32) are formed in the surfaces of the guide blades (3) at intervals; the bearing (31) is eccentrically arranged corresponding to the center of the impeller (2), and is connected to a bracket (5); and the bracket (5) is connected to the volute (1).
Owner:NINGBO FOTILE KITCHEN WARE CO LTD

Birotor impeller structure for improving whole-pressure efficiency of cross-flow fan

The invention provides a birotor impeller structure for improving whole-pressure efficiency of a cross-flow fan. According to the birotor impeller structure for improving the whole-pressure efficiency of the cross-flow fan, on the basis of an existing single-rotor scheme of the cross-flow fan, a one-level rotor is added therein so as to constitute the birotor impeller structure. The birotor impeller structure for improving the whole-pressure efficiency of the cross-flow fan comprises a shell and a birotor impeller, wherein the shell comprises a volute, a worm tongue and a side plate; the birotor impeller is mounted inside the volute on the shell; the birotor impeller comprises an outer ring rotor impeller and an inner ring rotor impeller; the outer ring rotor impeller is composed of outer ring rotor blades; and the inner ring rotor impeller is composed of inner ring rotor blades. The birotor impeller structure has the benefits as follows: on the premise of guaranteeing that the flow is unchanged, the birotor impeller structure has the characteristics of improving the whole-pressure efficiency of the cross-flow fan, further achieving an energy-saving effect, and meanwhile not changing the whole compactness of the cross-flow fan.
Owner:SHENYANG AEROSPACE UNIVERSITY

Low-noise forward multi-wing centrifugal blower

The invention relates to a high-head small-flow forward multi-wing centrifugal blower, which is formed by integrally casting and has a low-noise characteristic. The forward multi-wing centrifugal blower comprises a scroll casing, an impeller and a current collector, wherein the impeller is arranged in the scroll casing; and the current collector is arranged at the air inlet of the scroll casing. The forward multi-wing centrifugal blower is characterized in that: the impeller and the scroll casing are cast integrally; the impeller is a forward multi-wing narrow-cavity impeller; and the scroll casing is an indent narrow-cavity scroll casing. The forward multi-wing centrifugal blower has the advantages of high aerodynamic performance, low noise, light weight and high structural strength; and a gap between the impeller and the scroll casing is reduced by adopting a narrow-cavity indent structure, and vortex caused by backflow between the impeller and the scroll casing can be effectively reduced, so that the airflow vortex noise in a cavity is lowered. Compared with a large quantity of low-noise centrifugal ventilation fans with the same air performance, the low-noise forward multi-wing centrifugal blower has the advantages that: he total pressure efficiency is increased by 7 percent, the air noise is lowered by over 5 dB(A), and the vibration acceleration level elastic installation condition of a fan chassis can be less than or equal to 115 dB, which is far less than those of products of the same type.
Owner:CHINA SHIP DEV & DESIGN CENT +1

Dynamic prewhirl and axial push type hydrocyclone

The invention relates to a dynamic prewhirl and axial push type hydrocyclone which is composed of a medium prewhirl part and a hydrocyclone separating part. The invention is characterized in that materials are fed along the axial direction, a turnstile is used for prewhirl, the axial dimension of the turnstile is short and is not easy to vibrate; and the turnstile also has the function of boosting pressure, the pressure drop of the hydrocyclone is very low; a ring-shaped material axial propelling and accelerating structure is arranged in the outer ring area of the end part of the turnstile sothat the axial flow on the periphery of the hydrocyclone is increased, the heavy component on the border can faster reach a heavy liquid outlet, the treatment capacity is increased, the outflow of the unseparated inner medium is reduced, and the axial velocity gradient between layers is reduced, thus avoiding entrainment and blending. A short-circuit-proof baffle cap is arranged at the outlet of light liquid which flows backward so that the feed mixed medium is prevented from flowing to the outlet of light liquid, namely short circuit outflow while the separating efficiency is increased. The invention is applicable to the efficient separation of liquid-solid two-phase with solid particles or oil-water two-phase with solid particles.
Owner:DALIAN UNIV OF TECH

Axial-flow fire-fighting smoke exhaust fan

The invention discloses an axial flow type fire-fighting smoke exhaust fan. The axial flow type fire-fighting smoke exhaust fan comprises an enclosure and an impeller, wherein the diameter of the impeller is D and the diameter of a motor barrel is d; the enclosure is internally provided with a rectification cover and a rectification body; the rectification cover is fixed at the front end of the impeller; the rectification body is fixed at the rear end of the motor barrel; the rectification cover is semi-spherical, the radius (R) is equal to 0.25-0.35D and the length (L) is equal to 0.1-0.15D; the rectification body is in a butt conical shape and is gradually reduced along the direction of an air outlet; the conical half angle (alpha) is equal to 18-25 degree and the length (L1) is equal to 0.58-0.7d; the end part of the rectification body is in a circular arc shape; the central lines of the rectification cover and the rectification body are overlapped with the axis of the enclosure. According to the axial flow type fire-fighting smoke exhaust fan, the rectification cover and the rectification body are arranged at an air inlet and the air outlet in the enclosure so that the air inlet condition is more complete and the noises of the draught fan are reduced; an airflow channel of the inlet of the axial flow type fire-fighting smoke exhaust fan is formed by the rectification cover mounted in front of the impeller; by the aid of the rectification cover, the flow of the draught fan can be improved by about 10%.
Owner:FOSHAN CITY NANHAI POPULA FAN

Nursing and flushing aspirator for general surgery department

The invention discloses a nursing and flushing aspirator for the general surgery department, and relates to the technical field of medical instruments. The nursing washing aspirator for the general surgery department comprises an inflation box and a recovery tank, the bottom of the inflation box is provided with a base, the periphery of the base is connected with a fixing knob, the bottom of the fixing knob is fixedly provided with a connecting column, and the bottom of the connecting column is connected with a fixing suction cup; A communicating pipe is installed in the connecting column, an electronic sealing valve is installed in the communicating pipe, a sliding groove is formed in the inner wall of the inflation box, a reset spring is connected into the sliding groove, and the other end of the reset spring is connected with a driving plate. According to the nursing flushing aspirator for the general surgery department, the flow dividing pipe is arranged in the main body, so that a flushing pipe and a backflow pipe can be separated, the conditions of cross infection and secondary injury to a patient caused by using the same pipeline are avoided, and a disinfection tank and a recovery tank at the bottom of the main body are matched, so that recovery liquid and flushing liquid can be stored and collected, and later cleaning is facilitated; Meanwhile, the disinfection tank, the recovery tank and the main body are in threaded connection, so that the replacement process is convenient.
Owner:邵明红

A double-suction centrifugal fan

The invention discloses a double-suction type centrifugal ventilation fan. Centrifugal fan technologies in China still need to continue to improve, so as to enhance the stability of operation of fans, increase the efficiency of operation of the fans and lower the power consumption of the fans. According to the double-suction type centrifugal ventilation fan, a flow baffle is arranged at an outlet of a volute; two blade groups are symmetrically arranged at the two sides of a wheel disc; each blade group comprises a plurality of long blades and short blades; the long blades are uniformly distributed along the circumference, and a short blade is arranged between every two adjacent long blades; the inner end faces of the long and short blades are all welded to the wheel disc, and the outer end faces of the long and short blades are all welded to the inner ends of two wheel covers; the outer end of each of the two wheel covers is welded to a forward guider; bladeless pressure expanding edges are arranged at the edges of ends, welded to the long and short blades, of the wheel covers; the rim of the wheel disc is a spherical surface; a plurality of resistance reduction grooves which are equidistantly arranged along the axial direction of the wheel disc are formed in the internal sidewall of the volute. The double-suction type centrifugal ventilation fan has the advantages that the static pressure-flow characteristic and efficiency-flow characteristic of the existing double-suction type centrifugal ventilation fans can be improved, and thus, the pneumatic performance of the existing double-suction type centrifugal ventilation fans is improved.
Owner:ZHEJIANG SCI-TECH UNIV +1
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