34results about How to "Reduced separation loss" patented technology

The invention discloses a novel multi-blade centrifugal fan. The novel multi-blade centrifugal fan comprises a volute, a volute tongue and a plurality of fan blades fixed in the volute, wherein one lateral side of the volute tongue is fixed on the inner lateral side of the air outlet of the volute, the other lateral side of the volute tongue is a concave face, a plurality of air guide grooves are formed in the concave face, the two end faces of each fan blade are arc-shaped faces, a zigzag structure is arranged on one arc-shaped face of each fan blade, a bionic non-smooth structure is arranged on the other arc-shaped face of each fan blade, and airflow sequentially passes the bionic non-smooth structures and the zigzag structures and then is discharged from the air outlet of the volute. The novel multi-blade centrifugal fan has the advantages that the air quantity and air pressure of the fan are increased effectively, the noise of the fan is lowered effectively, and the efficiency of the fan is increased effectively.

The invention discloses a centrifugal fan impeller capable of adjusting splitting vanes, and aims at solving the problems that the common working conditions of a current fan product in use do not match with the rated working conditions, thus the service efficiency of a fan is low, and the efficient operation range of the fan is reduced. The centrifugal fan impeller capable of adjusting the splitting vanes is characterized in that a circular guide ring and a wheel disc form a revolving pair; a main fixing frame which is provided with a circular guide ring fixing device is fixed to the wheel disc; the circular guide ring is connected to n upper fixing devices for the circular ring and the splitting vanes; the splitting vanes are connected to a wheel cover through upper fixing devices for the wheel cover and the splitting vanes, and the splitting vanes are connected with the wheel disc through upper fixing devices for the wheel disc and the splitting vanes; each upper fixing device for the circular ring and the splitting vanes is connected to the corresponding upper fixing device for the wheel disc and the splitting vanes through a splitting vane adjusting part. According to the centrifugal fan impeller, the circular guide ring can be rotated to drive the splitting vane adjusting parts to swing so as to adjust the angles of the splitting vanes, thus the maximum operation efficiency can be obtained according to different working conditions, and the maximum operation efficiency which can be achieved only under the rated working conditions can be obtained by a centrifugal fan under the off-rating conditions.

The invention provides a drip-imitating tube-type demister, which is characterized by comprising at least two layers of parallel rows of tubes, wherein the rows of tubes are formed by tubes which are uniformly arrayed, the two ends of the rows of tubes are respectively supported on a plate, and the direction of flue gas flow is vertical to the direction of the short axis of the inner tubes of therow of tubes. The invention also provides a demister device, which is characterized by comprising the drip-imitating tube-type demister, wherein the drip-imitating tube-type demister is arranged at aflue gas desulfurization tower or the upstream of a horizontal flue, the demister is arranged at the downstream of the flue gas desulfurization tower, or a vane demister is arranged at the downstreamof the horizontal flue. The invention has the advantages that the demister reduces partial flow resistance, the area for blocking mist drop can be enlarged, demisting effect is improved, and scale isnot easy to form.

The invention relates to a cooling fan for a traction converter of a high-speed electric locomotive. The cooling fan comprises a rectangular box body (5), wherein a clapboard (11) is arranged at the middle of the box body (5) to divide the box body (5) into two independent cavities, a motor (7) is installed at rear side of each cavity, and an air inlet (9) and an air outlet (8) are respectively arranged at the front side and the lower side of each cavity. The cooling fan is characterized in that the rear side of each cavity is connected with the front end of the motor (7), an impeller (4) is arranged in each cavity and is coaxially installed on the output shaft of the motor (7), and two impellers (4) rotate counterclockwise during working so as not to mutually intervene. The cooling fan provided by the invention is mainly used for cooling the traction converters of motor trains with speed per hour of more than 380 km/h, and can satisfy the requirements of resisting low-temperature impact and high-speed vibration.

The invention relates to a double prerotation air intake guide blade of a cross flow fan, which belongs to the technical field of impeller machinery and comprises a positive prerotation guide blade group and a negative prerotation guide blade group, wherein the positive prerotation guide blade group comprises a plurality of air intake guide blades and the negative prerotation guide blade group comprises a plurality of air intake guide blades, the air intake guide blades of the positive prerotation guide blade group are sequentially arranged from to the end part of a volute of an air inlet of the cross flow fan to the center of the air inlet of the cross flow fan, and the air intake guide blades of the negative prerotation guide blade group are sequentially arranged from the end part of a volute tongue of the air inlet of the cross flow fan to the center of the air inlet of the cross flow fan. The invention can improve the local air intake condition of the cross flow fan and increase the operation efficiency of the cross flow fan as well as expand the stable operation working condition range of the cross flow fan, has simple structure, and can be conveniently arranged on various ventilated cross flow fans.

The invention provides a cross-flow fan blade, a cross-flow fan, an indoor unit and an air conditioner. The cross-flow fan blade comprises a blade body (1); the blade body (1) comprises a blade back (2); and the blade back (2) is provided with a rectification projection (3) projected on the blade back (2). The cross-flow fan blade can reduce the airflow separation phenomenon at the back part of the blade when the fan is rotated, and reduces the airflow separation loss.

The invention relates to a method for preparing sulfur ether intermediates of a proton pump inhibitor. According to the method, an ortho-nitroaniline compound is subjected to a continuous three-step and one-pot reaction process of reduction, cyclization and condensation by taking water and low alcohols as solvents under the alkaline condition to prepare a series of sulfur ether intermediates of the proton pump inhibitor () in high efficiency, wherein X and Y are nitrogen atoms or carbon atoms, and R1 is selected from one of hydrogen, methoxyl, pyrrole-1-yl and difluoro methoxyl; and R2, R3 and R4 are selected from one of hydrogen, methyl, methoxyl, 3-methoxyl n-propoxy, 2,2,2-trifluoro-ethyoxyl and methyl sec-butylamino respectively. The method has the advantages that a one-pot synthetic process is reasonable in design, easy and convenient to operate and environment-friendly, separation loss in the synthetic process is avoided, and target products are high in yield. A structural general formula is shown in the specification.

The invention provides a method for preparing a hinokitiol metal compound or a hinokitiol ammonium compound. The method comprises the following steps: dissolving hinokitiol in a water-soluble organicsolvent to obtain a hinokitiol solution with a hinokitiol concentration of 6-25 mol/L; fully mixing and reacting the obtained hinokitiol solution with an aqueous solution of water-soluble metal salt or ammonium salt at room temperature, wherein the water-soluble metal salt is selected from metal salt with solubility not lower than 35 g/100ml at room temperature, or the concentration of the aqueoussolution of the water-soluble metal salt or ammonium salt is not lower than 25% at room temperature, and the aqueous solution of the water-soluble metal salt or ammonium salt is further preferably asaturated solution of the water-soluble metal salt at 30-50 DEG C; and controlling the molar ratio of the water-soluble metal salt or ammonium salt to the hinokitiol to be 1: (0.9-5) to prepare a hinokitiol metal compound or hinokitiol ammonium compound solution. The method provided by the invention can fundamentally improve the instability characteristic that the hinokitiol is easy to decompose when meeting light, and avoids environmental pollution load and treatment cost of wastewater caused by the use of an acid solution.

The application discloses a multi-wing centrifugal fan blade, a vane wheel and a multi-wing centrifugal fan. The multi-wing centrifugal fan blade comprises a wing-shaped blade part and an arc-shaped blade part, wherein the tail end of the wing-shaped blade part is connected with the head end of the arc-shaped blade part. According to the multi-wing centrifugal fan blade disclosed by the application, the multi-wing centrifugal fan blade comprises the wing-shaped blade part and the arc-shaped blade part, the angle of an exit and entrance of the blade can be freely regulated through regulating the arc-shaped blade part, and the wing-shaped blade part adopts an optimal bending angle design, so that the bending angle of the blade cannot be too large; and through the wing-shaped blade part, theinlet impact loss of the arc-shaped blade part and the separation loss of a tail edge of the blade can be reduced, so that the inlet impact loss of the whole blade and the separation loss of the tailedge of the blade are reduced, the blade meets the optimal pneumatic performance, and the problem that in the prior art, the blade which is small in bending angle, low in inlet impact loss and low inseparation loss of the tail edge of the blade is not generated is solved.

The invention is applicable to the field of host-guest chemistry in supramolecular chemistry, and provides a method for efficiently separating cucurbit [n] uril. The method comprises the following steps: dissolving a cucurbit [n] uril mixture in water, and carrying out separation and purification to obtain a cucurbit [5, 7] uril mixture with good water solubility and a cucurbit [6, 8] uril mixturewith poor water solubility; and efficiently separating and purifying the cucurbituril homolog by utilizing different solubility of different cucurbiturils in a mixed solvent of formic acid and acetone. The method has the characteristics of simple separation process, short separation time, high separation efficiency, less separation loss and pure separation product.

The invention provides a pneumatic component comprising an axial diffuser, a dust collector and a compressor, the pneumatic component comprises a wheel cover, an impeller and the axial diffuser, the impeller is located in the wheel cover, an airflow channel is formed between the impeller and the wheel cover, the axial diffuser is connected to one axial end of the impeller, and the axial diffuser is connected to the other axial end of the impeller. And the impeller is arranged in the axial diffuser and can enable airflow coming out of the airflow channel to enter the axial diffuser to be pressurized, the width of the airflow outlet end of the impeller is smaller than that of the airflow inlet end of the axial diffuser, a certain gap is formed between the airflow outlet end of the impeller and the airflow inlet section of the axial diffuser, and a vaneless diffusion section is formed. The structure of the diffuser can axially extend under the condition that the effective diffusion capacity is not reduced, the radial structure size of the motor is effectively reduced, and noise is reduced.

The invention discloses a vertical-type threshing device and a vertical-type threshing harvester employing the same. The threshing device comprises a small belt pulley, a drive shaft, a vertical-typethreshing roller outer cylinder, a vertical-type threshing roller inner cylinder, a driving bevel gear, a driven bevel gear, and an obtuse angle threshing element. The drive shaft is fixedly connectedto a frame, and the small belt pulley is fixedly connected to the right end of the drive shaft. The vertical-type threshing roller outer cylinder is installed at the central part of the drive shaft,and the driving bevel gear is disposed at the central part of the drive shaft. The vertical-type threshing roller outer cylinder is fixedly connected with the frame, and the vertical-type threshing roller inner cylinder is disposed in the vertical-type threshing roller outer cylinder. The driven bevel gear is disposed in the vertical-type threshing roller inner cylinder. The driving bevel gear isengaged with the driven bevel gear. The obtuse angle threshing element is fixed on the external surface of the vertical-type threshing roller inner cylinder. The threshing device enables the overall length to be effectively reduced, effectively improves the threshing performance, effectively improves the distribution uniformity of threshed objects on a sifter, remarkably reduces the harvesting loss, and improves the harvesting quality.