218results about How to "Improved pressure stability" patented technology

The invention relates to a fast recovery diode (FRD) chip and a production process thereof. A diode with a P+NN+ structure is produced by adopting the process steps of diffusion pretreatment, double diffusion of a liquid source, back thinning, oxidization, platinum diffusion, photoetching, mesa etching, electrophoresis, sintering, scribing and the like. In the chip production process, a method of carrying out deep junction diffusion by carrying a liquid phosphorous source is adopted, so that the flatness of a diffusion junction is improved and the homogeneity and the stability of a breakdown voltage are strengthened; a method of reducing the concentration of a boron diffusion source and improving the purity of the boron diffusion source is adopted, so that the surge resistance capacity of an FRD is improved; and an electrophoresis glassivation process is adopted, so that the voltage withstanding stability and reliability of a bidirectional voltage stabilizing diode are improved. In addition, the production process has the advantages that the reverse recovery time is shortened, the switching speed is improved, the voltage drop is reduced, the power consumption is reduced, the voltage withstanding stability is improved, and the reliability of the diode is improved.

The invention relates to a porous superfine polyamide 6 fully-drawn yarn, a preparation method thereof, and equipment thereof. According to the invention, existing FDY production equipment is adopted. A raw material polyamide 6 is sliced and dried; an additive is added on line; the material is subject to screw extrusion and melt extrusion; the material is then cured with a gradually cooling manner and a circular air blow cooling manner; with a reasonably selected spinning temperature of 259-262 DEG C, an air temperature in the circular air blowing process of 19-23 DEG C, a humidity of 85-95%, an air velocity of 0.35-0.45m/s, an oiling and clustering position of 700-800mm, and a winding speed of 4100-4600m/min, the porous superfine polyamide 6 fully-drawn yarn product with a specification of 55dtex/144f-75dtex/144f is prepared. Flexible operation is adopted in the preparation method. The preparation method is advantaged in simple technology and low production cost. The product is advantaged in stable performance, good yarn evenness, and good coloration property.

The invention discloses a double-acting hydraulic control system of a supercharging device. The double-acting hydraulic control system comprises a hydraulic pump, an oil storage tank, a control valve, a first hydraulic cylinder, a second hydraulic cylinder and an oil make-up tank, wherein a piston rod of the first hydraulic cylinder and a piston rod of the second hydraulic cylinder are in butt joint. A first work port of the control valve communicates with a rodless cavity of the first hydraulic cylinder, a second work port of the control valve communicates with a rodless cavity of the second hydraulic cylinder, a fourth work port of the control valve communicates with the oil storage tank, and a third work port of the control valve communicates with an oil outlet of the hydraulic pump. A first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve are connected between a rod cavity of the first hydraulic cylinder and a rod cavity of the second hydraulic cylinder in parallel and are mounted symmetrically, and the oil make-up tank is arranged at the position, between the second one-way valve and the third one-way valve, of a pipeline. The double-acting hydraulic control system has the following beneficial effects that design is reasonable, practicality and convenience are achieved, equipment input is reduced, running energy consumption is low, the mechanic-electronic-hydraulic integrated design is adopted, and the intelligent degree is high.

The invention relates to a manufacturing technique of a chip for a two-way voltage regulator diode DB3, wherein the two-way voltage regulator diode DB3 is a symmetrical diode with the structure of N<+> PN<+>. The resilience voltage is increased due to the adoption of a triple photolithographic process, the trigger capacity of the two-way voltage regulator diode is improved; due to the application of shallow mesa or trench etching, the fragmentation rate is reduced; and glass is passivated due to the adoption of an electrophoretic process, the withstand voltage stability and reliability of the two-way voltage regulator diode are improved. The manufacture technique of the chip for the two-way voltage regulator diode has the advantages of improving the breakdown voltage stability of the two-way voltage regulator diode DB3, enhancing the trigger capacity of the diode, reducing the high-temperature power consumption, prolonging the service life of the diode, and simultaneously improving the qualification rate.

A method for joining microstructured component layers and a method for manufacturing microstructure component layers and the microstructure component layer is provided. At least one multifunctional barrier coating is applied to the joining surfaces of a base material layer for the microstructured component layers. The layers are made of aluminum/aluminum alloys and/or copper/copper alloys, and/or noble steels. At least one solder/brazing coating is applied to each barrier coating. The coated base material layers comprising the component layers are stacked. The stacked component layers are joined by solder/brazing using heat. The melting temperature of the solder/brazing coating is higher after the heat joining than before same.

The invention provides a gelatinizing and pressing-fit device for a plate, and belongs to the technical field of plate processing. The gelatinizing and pressing-fit device comprises a pressing-fit mechanism, a gelatinizing mechanism and a glue liquid control mechanism. A gelatinizing support of the gelatinizing mechanism is arranged on a guide rail in a left-right sliding manner, and a gelatinizing roll is rotationally arranged between two gelatinizing roll supporting plates. A first lead screw and a first lead screw nut are in threaded connection, and a second lead screw and a second lead screw nut are in threaded connection. The pressing-fit mechanism is arranged over the gelatinizing mechanism, and first sliding sleeve plate, a second sliding sleeve plate and a third sliding sleeve plate of the pressing-fit mechanism are arranged from top to bottom and arranged on a pressing rod in a vertical sliding manner. The rigidity of a first spring is smaller than that of a second spring, andthe rigidity of the second spring is smaller than that of a third spring. The gelatinizing and pressing-fit device is fast and even in gelatinizing, pressing-fit force changes can be divided into three stages, the pressing-fit force is in a gradually increasing broken line type, the pressing-fit force stability is good, and the gelatinizing and pressing-fit effect of the plate is greatly improved.

The invention discloses a urea pumping system. The urea pumping system comprises a urea box, a urea pump module, an energy accumulator and a nozzle module which are sequentially connected through a pipeline, wherein the urea pump module comprises a main pump used for pumping a liquid in the urea box to the nozzle module, and an auxiliary pump used for reversely sucking a liquid in the pipeline back into the urea box; the nozzle module comprises a first electromagnetic valve and an atomization nozzle; the first electromagnetic valve is connected with the energy accumulator and the atomization nozzle through the pipeline; a reflux pipeline which communicates with the urea box is arranged on the pipeline between the first electromagnetic valve and the energy accumulator; and a first damping hole is formed in the reflux pipeline. According to the urea pumping system, an airfree auxiliary structure is adopted, double-pump parallel connection is adopted, when a urea solution is injected, the main pump is started, the urea solution is pumped from the urea box to the nozzle module, after injection, the auxiliary pump sucks the urea solution remaining in the system back into the urea box, and the problems of urea crystallization and pipeline blocking are solved.

The invention relates to a flux meter, especially a inner concealing cone throttling set that includes a sensor device, and flow guiding cone, front pressure collecting pipe, front pressure measuring pipe, front pressure measuring head. It has low request to the straight pipe section and could measure wide dynamic range high accuracy flow and is suitable to kinds of liquid.

The invention discloses a component type high-pressure common rail device. A common rail pipe is provided with a pressure sensor and a pressure limiter. The common rail pipe comprises an inner pipe and an outer pipe; a circumferential limit device is arranged between the inner pipe and the outer pipe; the two ends of the outer pipe are fixedly sleeved with a seal cover and the seal covers are used for sealing the two ends of the outer pipe; the circumferential surface of the common rail pipe is provided with an oil inlet and multiple oil outlets; and on the inner circumferential surface of the inner pipe, an annular inward-convex table stretching along the circumferential direction of the inner pipe is respectively arranged between the oil inlet and an oil outlet adjacent to the oil inlet and between two adjacent oil outlets. The component type high-pressure common rail device disclosed by the invention can improve the pressure stability in the common rail pipe, reduce the fluctuation of pressure, and guarantee stability of fuel injection of the high-pressure common rail system.

It relates to a current pressure reducing valve. It comprises a valve, valve core bar, pressure regulating cover, involucra, spring, spring base, regulating pressure screw, nut, epithelial pressure plate, O type ring of valve core bar, O type rings behind and before the pressure reducing valve base, pressure reducing valve base, seal gasket, seal gasket pressure plate, hexagonal cap, block and return hole, with inner thread on the valve fitting with the outside thread of the pressure regulating cap. It is reasonable, reliable in connection, convenient in installation, clean in working environment, endurable, good in performance and low in cost.

The invention discloses a replaceable shock-absorbing and energy-dissipating type double-leg high-pier system beam and relates to the technical field of earthquake resistance and shock absorption of bridge structures. The replaceable shock-absorbing and energy-dissipating type double-leg high-pier system beam comprises a rigid rod and connection structures at the two ends of the rigid rod; each connection structure comprises a rotating plate, a lug plate and an end plate; the end plates are fixedly connected with double-leg high piers on the two sides; the lug plates are welded to the plate faces of the end plates; one end of each rotating plate is welded to the rigid rod; the other end of each rotating plate is connected with the corresponding lug plate through a concentric shaft; annular grooves are formed in the contact faces of the lug plates and the rotating plates around the concentric shafts; a plurality of groove holes are evenly formed in the contact faces of the rotating plates and the lug plates in the circumferential direction of the grooves. The groove holes are communicated with the grooves. Soft lead solidified into a whole is poured in the grooves and the groove holes. The system beam can replace a reinforced concrete system beam which is traditionally used, the calculating height of the piers can be reduced, static force stability is improved, energy dissipation can be performed in an earthquake, the earthquake resistance of the piers is improved, and the replaceable shock-absorbing and energy-dissipating type double-leg high-pier system beam is easy to replace after an earthquake.

The invention relates to a heat exchanger for motor vehicles, especially for utility vehicles. Said heat exchanger comprises a heat exchanger unit (2), constituted of tubes (5) having tube ends and ribs (6) disposed between said tubes (5), and collecting tanks (3, 4), disposed on both ends and produced by internal high pressure forming for introducing and discharging a medium. Said collecting tanks (3, 4) comprise bottoms with openings for receiving the tube ends, covers and inlet and outlet tubes (7, 11).

The invention discloses an automatic position-adjustment laminating machine. The automatic position-adjustment laminating machine comprises a membrane platform mechanism, a plate platform mechanism, a circuit board and a machine frame, wherein the membrane platform mechanism comprises a membrane platform, an upper frame, a middle frame and a bottom frame; the membrane platform is arranged right above the upper frame; the bottom surface of the upper frame is connected with the middle frame through a horizontal adjustment component; the bottom frame is arranged on the machine frame through a rail in the X-axial direction; a horizontal adjustment component is also arranged between the plate platform and a rotating plate; a camera is arranged on the machine frame above the membrane platform and the plate platform. According to the automatic position-adjustment laminating machine, a membrane and the plate are not required to be aligned manually; the laminating efficiency is improved; the positions of the membrane platform and the plate platform are adjusted automatically; the laminating accuracy is improved; the smoothness after the membrane is laminated is improved; an independently controlled rubber roller frame is arranged; the stability of pressure provided for laminating the membrane is high; the operation is convenient; the controllability is high.

The invention provides a parallel liquid phase chromatographic pump. The parallel liquid phase chromatographic pump comprises a cam with a camshaft, a pump head, at least two reciprocating fluid delivery mechanisms and a cam driving mechanism; the cam is an end cam; a cam curve comprises 1 to 5 curve units; and each curve unit comprises an ascending curve which can convert the rotating motion of the cam into the uniform linear motion of a plunger and a recession curve which enables the plunger to return in situ. Leads r of the ascending curve and the recession curve are both equal to 4v/npiD<2>, and a lead angle theta of the ascending curve is equal to 360 degrees/n, wherein v is the delivery volume of the parallel liquid phase chromatographic pump when the cam rotates a circle; D is the diameter of the plunger; n is the number of the plungers; and n is an integer of 2 to 10. A supporting roller has a conic shape; and the ratio of the circumference of one of any two cross sections of the supporting roller to the perimeter of the cam curve at the corresponding position is equal to the ratio of the circumference of the other of any two cross sections of the supporting roller to the perimeter of the cam curve at the corresponding position. The parallel liquid phase chromatographic pump has a simple structure and high fluid pressure stability, and is easy to design and process.

The invention relates to a liquid control system for double-fluid injection, which comprises a liquid source device, a liquid control device, a return suction device and a double-fluid injector, wherein the liquid source device, the liquid control device, the double-fluid injector and the return suction device are connected by hoses in turn, and liquid supply and recovery of the double-fluid injector are realized. In a liquid source device, a hydraulic pump is adopted to convey liquid to the system, and a peristaltic pump is used to reduce impulse. In the liquid control device, a liquid electromagnetic valve is adopted to supply continuous or impulse liquid flow to downstream equipment, a liquid one-way valve is arranged in the path of liquid before entering a mixing chamber to prevent liquid backflow caused by overhigh pressure in the mixing chamber, a return suction opening is formed on the other side of the mixing chamber, and a micro air pump is used to suck liquid before the system stops working to avoid trailing, wire drawing and other phenomena. The system can be used in ink injection, glue injection and welding processes and other processes, particularly a double-fluid injection spot gluing process.

An annular seal member configured to seal a gap between a shaft hole and a shaft inserted into the shaft hole, the annular seal member comprises: an annular base part; an annular lip, which includes a lip edge that is configured to be contact with one of a hole face of a shaft hole and an outer periphery of a shaft, the one of which is a seal mating face; a first convex part, a second convex part and a passage recess, which is provided at a face of the base part facing the seal mating face; a concave part, which is formed at a position between the second convex part and the base end portion of the annular lip, and which has a circumferential size larger than a recess width of the passage recess.