78results about How to "Wide range of working conditions" patented technology

A superhard sintered body containing cubic boron nitride is bonded to an apical angle part of a tool body having a polygonal shape, and an edge and a chip breaker are formed on the superhard sintered body. A chamfer is formed on the intersection between the upper surface and the side surface of the superhard sintered body, the chip breaker has a protrusion, and an angle θ formed by ridges on the apex of the protrusion or a tangential line at a point bisecting the ridges and a bisector for the apical angle and the ratio of the distance between a first intersection between the two ridges on the apex of the protrusion and an extreme point of the first ridge to the distance between a second intersection between a straight line passing through the first intersection and the extreme point and the outer periphery of the tool body and the first intersection are in prescribed ranges.

A catalyst system for synthesizing the acetic anhydride from methyl acetate or bimether by catalytic reaction contains active component (Rh matches) and cocatalyst (alkyl diodine, phosphate and iodine salt). Said catalytic reaction between methyl acetate or bimether, CO and H2 is conducted in acetic acid. Its advantages are high catalytic activity and high stability.

A method for identifying a noise source in a high speed train is characterized in that each of a plurality of possible vibration exciting points is equipped with at least one measuring point sensor; a backup sensor is arranged at the same measuring point position in a different direction, or a plurality of sensors simultaneously acquiring signals are mounted at the same measuring point; before the test, an exciting hammer is used for knocking on each measuring point of an input signal, and the output response of all the other measuring points is tested at the same time so as to constitute a real transfer relation of the measuring points before mutual crosstalk; strongly coupled crosstalk data of an input channel are strongly decoupled through actual output signals of the measuring points; real exciting signals of the measuring points after the decoupling are used for the identification and analysis of a sound source in the train; and the exciting measuring points are ranked with respect to influence factors of response points to determine the main noise source of the noise in the train. According to the invention, the false frequency can be eliminated to accurately determine a noise source outside the train and a vibration source so as to facilitate the effective control and reduction of the noise in the high speed train.

A weight-type retaining wall design method based on earthquake displacement relates to a retaining wall design method. The invention resolves the following problems in prior retaining wall aseismatic design methods: Not considering of the slide displacement or the rotary displacement of wall bodies; or only considering the slide displacement, but not of the rotary displacement of wall bodies, so that design allowance displacement of retaining walls is by far different from actual displacement; as well as two big displacement or insufficient estimation on the displacement, so as to influence utilization functions of retaining walls. Main steps of the invention are as follows: Design the section of a retaining wall and take the allowable displacement at the wall top, so as to establish the mathematical module for the wall body motion equation; establish the mathematical module of the earthquake calculate displacement at the wall top; compare the earthquake calculate displacement delta at the wall top against the allowable displacement [DELTA]. The invention overcomes the shortcomings in prior design methods that only considering of horizontal slide displacement of wall bodies, but not of the insufficiency of cohesion force on backfilled soil; the motion equation considers of the coupling movement between the slide displacement and rotation for the wall bodies, so that the method is suitable for more expansible working conditions and more closes to engineering facts.

The invention discloses an axial flow blade form. The surface of the axial flow blade form comprises a suction curved surface, a pressure curved surface, an upper curved surface and a lower curved surface, wherein the side surfaces of two cylinders cover the upper curved surface and the lower curved surface, the radii of the cylinders corresponding to the upper curved surface and the lower curved surface are separately marked as R2 and R1, and R2 is larger than R1; the side surfaces of a series of coaxial cylinders of which the radii r changing from R1 to R2 are crossed with the axial flow blade form, forming a series of crossed surfaces, and then, the series of crossed surfaces are spread along the plane so as to obtain a series of spread cross sections; and a blade inlet angle varies with the variation of the ratio value of a height ratio, and both the angle variation of the blade inlet angle and the length variation of a chord meet a cubic spline curve relationship. By improving key shape parameters (for example, the blade inlet mounting angle, the blade outlet mounting angle, the specific variation form of the chord with blade height and the like), the problem that the efficiency of the axial flow blade is low can be effectively solved.

The invention discloses a multi-axle steering control method for improving vehicle handling stability. The multi-axle steering control method comprises the steps that the first carriage front wheel steering angle delta f and the vehicle transverse swaying angular speed r are obtained; and through the direct ratio values of the vehicle front wheel steering angle delta f and the vehicle transverse swaying angular speed r, the rear wheel steering angle delta r is calculated, and steering of rear wheels is controlled. The multi-axle steering control method has the advantages that the multi-axle steering characteristic is achieved, the first-section vehicle mass center side slip angle is kept to be zero, the stability of a vehicle can be effectively improved, the lateral response speed of the vehicle can be effectively increased, and the track following ability under the low-speed situation can be ensured.

The invention provides a pipeline compressor model stage with flow coefficient of 0.0495. The pipeline compressor model stage comprises an impeller, a vaneless diffuser, a bend and a return device. The impeller is located at the position of an inlet of the model stage, and the vaneless diffuser is arranged at an outlet of the impeller. The return device is located at the position of an outlet of the model stage, and the vaneless diffuser communicates with the bend through the return device. The machine Mach number Mu2 of the model stage ranges from 0.35 to 0.65, the flow coefficient theta of a design point is 0.0495, the energy head coefficient tau of the design point is 0.603, the polytropic efficiency eta of all the Mach numbers under the design flow coefficient work conditions ranges from 0.867 to 0.872, and the applied flow range is 60%-150% of the design point. The invention further provides a design method of the impeller of the model stage. The model stage is high in efficiency, high in energy head efficiency, large in hub ratio and small in span, by means of the model stage, a light-medium compressor can have high running efficiency and a wide work condition range, meanwhile the working rotating speed of a rotor can be reduced, the bearing span is shortened, and the rotor stability is improved.

The invention relates to a hard sealing lifting type brake plug valve and a control method thereof. The hard sealing lifting type brake plug valve comprises a valve body, a valve seat, a valve plug, a valve rod, a gasket, a valve deck, studs, pins, a packing bushing, swing bolts, a packing pressing plate, swing bolts, a hand wheel, a hand wheel gasket, a nut, packing and a valve rod nut. The valve body and the valve deck are connected through the studs. The valve deck and the packing pressing plate are connected through the swing bolts. The valve rod is connected with the valve plug through a head flat-square part. A full-bore partial-rotation structure is adopted, the flow coefficient is large, and the opening and closing space is small. The metal-sealing, fireproof, anti-static and blowout prevention valve rod structure is adopted, and the hard sealing lifting type brake plug valve is suitable for high-temperature-resistant, high-pressure-resistant and strong-corrosion-resistant working conditions and is wide in application range. The packing structure can be replaced on line, and online maintenance is convenient. During operation, a sealing pair is disengaged, friction between opening and closing torque and the sealing pair is reduced, and the service life of the valve is prolonged.

An engine with a level-variable turbocharging system comprises an engine body (1) and the level-variable turbocharging system, wherein the engine body (1) comprises an engine mechanical assembly and an engine electric control unit; the level-variable turbocharging system comprises a large turbocharger (21), a middle turbocharger (22) and a small turbocharger (23) which are different in flow, each of the turbochargers comprises a turbine and an air compressor which form a network with an air pipe through a tee joint (312), a tee joint (322), a tee joint (331), a tee joint (342), a tee joint (381), a tee joint (412), a tee joint (422), a tee joint (441), a tee joint (451), a three-way valve (311), a three-way valve (321), a three-way valve (341), a three-way valve (351), a three-way valve (411), a three-way valve (421) and a three-way valve (461), and connected with the engine body (1).

The invention provides a composite filter material and a preparation method thereof. The composite filter material provided by the invention comprises a first PTFE impregnating layer, a chemical fibernet layer, a glass fiber expanded fabric layer and a second PTFE impregnating layer which are sequentially contacted, wherein the chemical fiber net layer is combined with the glass fiber expanded fabric layer to realize a synergistic effect as well as excellent filtering performance, temperature resistance and strength performance; meanwhile, the PTFE impregnating layers are compounded on two sides of a combination body so as to facilitate the collection of fine dust and further improve the dust removal efficiency. Therefore, the integral composite material has excellent filtering performance, temperature and corrosion resistance, broad use conditions and long service life.

The invention belongs to a centrifugal compressor model stage, and particularly relates to a model stage special for a pipeline compressor. The model stage is suitable for modeling design of a pipeline compressor product. The model stage comprises an impeller, a vaneless diffuser, a curve and a backflow device; the impeller is located at the inlet position of the model stage, the vaneless diffuser is arranged at an outlet of the impeller, the backflow device is located at the outlet position of the model stage, and the vaneless diffuser is communicated with the backflow device through the bend; and the design machine mach number Mu2 of the model stage is 0.35 to 0.5, the flow coefficient phi1 is equal to 0.023 to 0.053, the energy head coefficient tau is equal to 0.47 to 0.71, the design condition point polytropic efficiency etapol under each mach number is equal to 0.846 to 0.873, the hub ratio ds/D2 of the model stage is equal to 0.4, and the ratio L/D2 of the span to the diameter is 0.292. The model stage is high in efficiency, high in energy head coefficient, large in hub ratio and small in span; by means of the model stage, the pipeline compressor can have the higher running efficiency and wider working condition scope; and meanwhile, the rotor working rotating speed can be decreased, the bearing span is shortened, and the rotor stability is improved.

The invention relates to the technical field of civil engineering, and is specifically applied to a mobile hydraulic work protection platform in a tunnel, including a flatbed transport vehicle, a wheel-rail type hydraulic lifting platform part installed on the vehicle body, and a wheel-rail type hydraulic lifting arch installation trolley part It is the same as the wheel-rail hydraulic lifting and telescopic protection platform part. The wheel-rail hydraulic lifting platform part includes the wheel-rail hydraulic lifting platform, which includes the upper part of the platform and the lower part of the platform. The lower part of the platform is equipped with a platform walking device and a To support the supporting legs of the hydraulic lifting platform, the upper part of the platform is equipped with a lifting device and a foldable working platform. The installation trolley part of the wheel-rail hydraulic lifting arch frame includes the installation trolley installed on the trolley working platform, and the wheel-rail hydraulic lifting and telescopic The protective platform part includes a wheel-rail hydraulic lifting telescopic protective platform, a protective platform lifting device and a protective platform lifting platform. This platform has the technical advantage of high security in centralized operations.

The invention discloses a liquid mechanical seal internally provided with an axial floating tray sleeve. The mechanical seal comprises a movable ring (1), a static ring (2), a locking ring (9) and thetray sleeve (3), wherein the static ring (2) is connected with a gland (12) and a shell (13) and stationary, the movable ring (1) is fixed to a shaft or shaft sleeve (7) through the locking ring (9)and rotated, and the contact face between the movable ring (1) and the static ring (2) form a seal face in perpendicular sliding fit with the shaft. The tray sleeve (3) is located between a sealing ring and the shaft or shaft sleeve in the axis vertical direction, the inner side end, close to liquid, of the tray sleeve (3) in the axis direction is connected with the movable ring (1) or the staticring (2), and the end, close to air, of the tray sleeve (3) in the axis direction extends out of the gland (12). Abrasion of the sealing ring can be effectively early warned, and sealing effectivenessand reliability are ensured.

The invention discloses a square cabin lifting device and relates to a worm type lifting mechanism. The worm type lifting mechanism comprises a drive wheel and a drive device which are arranged in cooperation with a transmission chain. A worm gear reducer is assembled between the drive wheel and the drive device. When the drive device drives the drive wheel to rotate, a square bin support ascends and descends under the drive of the transmission chain. A worm type lifting system comprises four worm type lifting mechanisms arranged at the four corners of a square bin in a supported manner. The lifting mechanism provides large rotation torque for conversion of the worm gear reducer and lower the requirement for torque of the drive device; in addition, the square cabin can ascend and descend stably and is safely and rapidly operated due to the self-locking performance of a worm wheel and a worm, and the use requirement for actions such as fast field emergency rescue is met; and in addition, transmission rods are sequentially connected with the lifting system composed of the worm type lifting mechanisms, synchronous ascending and descending of four supporting points of the square cabin are ensured, one person is enough for one-point operation, labor force is saved, and the lifting efficiency is improved.

The invention relates to a hydrate gel type filter element and a preparation method thereof. The hydrate gel type filter element comprises hydrogel for barrier filtration and a support for supportingthe hydrogel. The hydrogel is metal hydroxide gel, and the support is prepared from metal oxide and nonoxide ceramic materials. The hydrate gel type filter element prepared according to the method isextensively applicable to the field of water purification and capable of effectively removing bacteria and viruses in water and has excellent improving effects on water turbidity and color and excellent removal effects on total organic carbon and the like.

The invention provides a blade-adjustable semi-open impeller which comprises an impeller disc, an adjusting ring and blades. An annular boss is arranged on the front of the impeller disc, and the adjusting ring can be mounted on the boss in a sleeving manner. When a positioning pin hole A is formed in each blade, a corresponding long round hole B is formed in the adjusting ring, a long round groove A corresponding to each long round hole B and crossed with the same in extending direction is formed in the impeller disc, a positioning pin A is arranged in each positioning pin hole A, and one end of each positioning pin A is fixed in the corresponding positioning pin hole A while the other end of the same penetrates the corresponding long round hole B to be inserted into the corresponding long round groove A. The blade-adjustable semi-open impeller has a blade detachable function, and the blade can rotate to change angle in a plane of the impeller disc when not being detached completely to realize wider working range and improve efficiency of a fan.

The invention discloses a purification method for deep dehydration and impurity removal of olefin by full-temperature range adsorptive extraction. The purification method is characterized in that crude olefin feed gas (liquid) enters a gas/liquid phase adsorption process, an extraction and desorption process and an extracting agent regeneration process sequentially, moisture and trace impurity components are absorbed by an absorbing agent, and an olefin product with a purity of more than or equal to 99.9-99.99 percent (v/v) flows out from the top of an adsorption tower; after the adsorption process is completed, an extracting agent is introduced into the adsorption tower for the extraction and desorption process to dissolve out the moisture and the trace impurity components. Extraction anddesorption gas enters the extracting agent regeneration process, and the extracting agent is recovered and recycled after treatment. The purification method disclosed by the invention has the benefits that by adopting an adsorption-extraction and desorption process and in combination with an adsorption mechanism and an extraction and desorption dissolving mechanism, the whole operation process ismore stable and safer, the energy consumption is low, the product purity is high, the equipment investment cost is low, the purity of the olefin product is more than or equal to 99.9-99.99 percent, and the yield is more than or equal to 99 percent.

The invention provides an electric tool which comprises a shell, a motor arranged in the shell and an output shaft and is provided with a flexible conduction system, wherein the flexible conduction system is driven by the motor, is connected with the output shaft and can be used for transmitting the torque of the motor to the output shaft. Since the flexible conduction system is flexible, the electric tool can be operated under a narrow environment.

The invention provides a pipeline compressor model stage with the flow coefficient being 0.0293. The pipeline compressor model stage comprises an impeller, a vaneless diffuser, a curve and a backflow device; the impeller is located at the position of an inlet of the model stage, the vaneless diffuser is arranged at an outlet of the impeller, the backflow device is located at the position of an outlet of the model stage, and the vaneless diffuser is communicated with the backflow device through the curve; and the machine mach number Mu2 of the model stage ranges from 0.35 to 0.65, the flow coefficient phi1 of a design point is equal to 0.0293, the energy head coefficient tau of the design point is equal to 0.614, the polytropic efficiency etapcl under the discharge coefficient working condition designed under all mach numbers ranges from 0.838 to 0.843, and the applied flow scope is 60% to 150% that of the design point. The invention further provides a design method of the impeller of the model stage. The model stage is high in efficiency, high in energy head coefficient, large in hub ratio and small in span; by means of the model stage, a light medium compressor can have the high running efficiency and the wide working condition scope; and meanwhile, the working rotating speed of a rotor can be reduced, the bearing span can be decreased, and the stability of the rotor is improved.

The invention provides a method for exploiting oil sand through paraffin media. In at least one period, the method includes the following steps: a central tube is arranged on an oil deposit section in an oil well shaft, a sleeve is arranged outside the central tube, and annular space between the central tube and the sleeve is used for containing liquid water; a steam hole is formed in the upper end of the central tube, the position of the steam hole is higher than a working liquid level of the liquid water in the annular space between the central tube and the sleeve, and a steam outlet hole is formed in the lower end; the paraffin media are injected into annular space between the shaft and the sleeve to maintain the reservoir pressure, and are heated through a heating system; the liquid water is continuously injected into the annular space between the central tube and the sleeve; heat exchanging is carried out between the paraffin media and the liquid water to generate steam, and the steam enters the central tube through the steam hole of the central tube and flows out from the steam outlet hole to be in contact with an oil deposit for heat exchanging; when the steam injection amount meets the oil field steam flooding period heat supply requirement, heating is stopped, water is supplied, and oil extraction is carried out after a well is shut. The method is stable in steam generation, free of pollution, convenient to maintain and low in investment.

The invention discloses a rotary air preheater sealing structure. The sealing structure is mainly composed of seal washers and seal grooves. The seal grooves are radially arranged on air preheater rotors. The corresponding seal washers are embedded into the seal grooves, and one end of each seal washer is fixed to a central cylinder of an air preheater; the other end of the seal washer is free. The bottoms of the seal washers are embedded into the seal grooves, and the minimum rational clearance is kept between the top of each seal washer and a sector plate. In operation, the seal grooves incline toward the peripheries of the rotors from the central cylinder, while only one section of the seal washers is fixed to the central cylinder, and does not incline with the central cylinder. In this way, the bottoms of the seal washers are still embedded into the seal groove for a certain depth to ensure the sealing effect; and the minimum clearance can still be kept between the top of the seal washer and the sector plate. The air leakage rate of the air preheater is ensured to be unchanged under different working conditions for a long time, and is kept at a low level. The rotary air preheater sealing structure disclosed by the invention has the advantages of rational and simple structure, little maintenance, uneasy jamming, abrasion or deformation, and wide application scope of working conditions, and is an important innovation of a rotary air preheater seal.