823results about How to "Improve flow capacity" patented technology

A pressure exchanger for transferring pressure energy from a relatively high-pressure fluid stream to another relatively low-pressure fluid stream is provided. A ducted rotor is positioned on a central axle between two end covers inside a pressure vessel with a coaxial inlet and outlet pair that is in communication with a pair of low pressure ports having inclination forming an inlet tangential velocity vector in the direction of rotor rotation and an outlet tangential velocity vector in opposite direction imparting a rotational momentum on rotor. A pair of high-pressure ports is adapted for flow without inclination and imparts no momentum to rotor and flow can be varied without impacting the rotor's RPM. The end covers have a sloped surface following a flat sealing area that increases the clearance in the direction of rotation causing increased outflow during depressurization and lower duct pressure before duct is exposed to low pressure port and furthermore causing increased inflow during the pressurization phase before duct is exposed to the high pressure port, which will dissipate pressure energy as opposed to producing cavitation or pressure waves with result wear and noise.

The invention discloses a novel inflatable switch cabinet which comprises a cabinet body. A gas tank is arranged on the rear side of the cabinet body, a control chamber is arranged on the upper portion of the front side of the cabinet body, a cable chamber is arranged on the lower portion of the front side of the cabinet body, a vacuum breaker is arranged on the upper portion of the gas tank, an isolating switch is arranged in the middle of the gas tank, a main loop is arranged on the lower portion of the gas tank, and an isolating switch operating mechanism and a vacuum breaker operating mechanism are arranged in the control chamber. The isolating switch operating mechanism achieves switch-on, switch-off and ground connection of a disconnecting link by operating a first operating shaft and a second operating shaft, and power-driven operation can be achieved. The vacuum breaker comprises an insulation support, a vacuum bubble and an operating main shaft, the vacuum bubble is arranged in the insulation support in the mode with an upward dynamic contact, a conductive contact and a conductive piece are fixedly arranged on the lower portion of the insulation support and are fixedly connected with a static contact at the lower end of the vacuum bubble, the conductive contact and the disconnecting link are matched for switch-on, and the operating main shaft drives the dynamic contact at the upper end of the vacuum bubble to vertically move to achieve switch-on and switch-off of the vacuum breaker. The novel inflatable switch cabinet is compact in structure, reliable in motion, safe in use and convenient to maintain.

The invention relates to a circuit breaker and a realization method thereof, and particularly relates to a high-voltage DC circuit breaker and a realization method thereof. The DC circuit breaker, based on a secondary current transferring principle, comprises a main branch, a current transferring branch and an energy absorption branch in parallel connection. The DC circuit breaker is serially connected in a DC system. The main branch comprises at least one high-speed mechanical switch K and at least one current transferring module comprising a fully-controlled device in serial connection. The current transferring branch is a bridge circuit formed by thyristor valves, inductors and capacitors. The energy absorption branch is formed by a non-linear resistor. The invention also provides a high-voltage DC circuit breaker realization method. The circuit breaker provided by the invention has a simple topological structure, the control is simple and convenient, used power electronic devices are mainly half-controlled thyristors, the technology is mature, realization is easy, the current breaking ability is large, a voltage-withstanding grade is high, the extension ability is strong, and the cost is greatly reduced.

A passive high-voltage direct-current circuit breaker and an implementation method therefor. The high-voltage direct-current circuit breaker is connected in a direct-current system in series, and comprises an energy absorption branch, a main branch and a current transfer branch which are connected in parallel, wherein the current transfer branch comprises first current transfer branches (T1, T2) and second current transfer branches(T3, T4); the energy absorption branch is composed of a nonlinear resistor (MOV); and the main branch comprises at least two groups of high-speed mechanical switches (K1, K2) and at least two groups of full controlled device modules which are connected in series. Since the circuit has a simple topology structure, is simple and convenient to control, and is flexible to apply, the energy required by injecting a current into a capacitor can be obtained from a system without configuring an auxiliary power source, thereby improving the reliability of an apparatus. The used power electronic devices are mainly half controlled thyristors, so that the series connection technology is mature, the capability for current segmentation is strong, the level of withstand voltage is high, the expansion capability is strong, and the costs of devices are low.

The invention discloses a mixed-type high-voltage DC breaker and an implementation method thereof. The DC breaker is connected in a DC system in series and concretely comprises the following branches connected in parallel: an on-state branch, a pre-transfer branch, a re-transfer branch and an energy-dissipating branch. The on-state branch comprises at least one quick mechanical switch and a first current transfer module including a full control device, and the quick mechanical switch and the first current transfer module are connected in series. The pre-transfer branch comprises the following parts connected in series: a first inductor, a first semi-control device thyristor serial connection module, and a second current transfer module including a full control device. The re-transfer branch comprises the following parts connected in series: a second inductor, a second semi-control device thyristor serial connection module, and a capacitor. The energy-dissipating branch is formed by a non-linear resistor. The implementation method comprises corresponding operations when the DC system runs normally or when a short circuit fault happens to the DC system. With the prerequisites including a fast enough breaking speed and low losses ensured, the DC breaker employs the semi-control device thyristors, so that the capability of breaking current is good, the voltage-withstanding level is high, and the cost is greatly reduced.

The invention discloses a zinc oxide pressure-sensitive resistor. The zinc oxide pressure-sensitive resistor comprises a zinc oxide pressure-sensitive ceramic substrate, electrode layers and electrode leads, wherein the electrode layers are arranged on the upper surface and the lower surface of the zinc oxide pressure-sensitive ceramic substrate respectively; the electrode leads are arranged on the electrode layers respectively. The zinc oxide pressure-sensitive resistor is characterized in that each electrode layer comprises a bottom transition layer which is used for improving bonding force between the zinc oxide pressure-sensitive ceramic substrate and the corresponding electrode layer and reducing contact resistance. Therefore, the electrode layers and the zinc oxide pressure-sensitive ceramic substrate are firmly bonded, and the self through-current capability of the electrode layers is improved. Furthermore, the curved electrode leads are capable of uniformly distributing current on the electrode layers. The surge impact resistance capacity of the zinc oxide pressure-sensitive resistor is improved. The whole preparation process has an environment protection effect, and can reduce over 45 percent of consumed energy and save over 60 percent of production costs compared with the prior art.

The invention provides balanced valve which comprises a main valve body (1) and a main valve core (4), wherein the main valve body (1) is provided with a positive oil outlet (A) and a reverse oil outlet (B); the main valve core (4) comprises a first acting surface (A1) and a second acting surface (A2) which are opposite to each other; the first acting surface is exposed in a first acting cavity (3) communicated with the reverse oil outlet; the second acting surface is exposed in a second acting cavity (17) communicated with the reverse oil outlet through a dumping groove (5); and the balanced valve further comprises a guiding control module which enables the second acting cavity to be selectively communicated with an oil draining port through a guiding control oil port (X). In addition, the invention also provides a hydraulic cylinder expansion control loop and a hydraulic crane. Due to the guiding control method, a large control ratio can be obtained through controlling the size of a guiding piston rod, the descending speed limitation control of the balanced valve is more sensitive, the influence of the load pressure on the openness of the main valve core is slight, frequent shaking can not be generated, the work stability is good, and the energy-saving effect is excellent.

The invention provides a high voltage direct current circuit breaker topology circuit which comprises a main branch, a current transfer branch and an energy absorption branch. The main branch, the current transfer branch and the energy absorption branch are connected in parallel. According to the high voltage direct current circuit breaker topology circuit provided by the invention, the structure of a circuit topology is simple; a stable current zero crossing point is in a breaking process; and the high voltage direct current circuit breaker topology circuit has the advantages of convenient control, flexible application, easy realization, high current breaking capacity, high withstand voltage level, high expansibility and low equipment cost.

The invention relates to and provides a method for preparing high throughflow nano composite arrester varistor, and its characteristic: it adopts nano ZnO material as the main material, adds nano powder additive in 5-20wt% to mix them fully, makes press forming by a two-way press to form the varistor, then sinters at 900-1100 deg.C to make a main body of ZnO varistor; sprays aluminum on the main body and coats an inorganic high resistance layer on the side of the ZnO varistor, where the high resistance layer is mainly made of lead oxide or chrome oxide; then coats the side with heavy current-withstanding nano insulating composite coating prepared of nano functional fillings and epoxy oxazolidinone resin in the ratio of 20-30 to 70-80 (wt%), uniformly roll-coats the prepared nano insulating composite coating on the side, dries at a high temperature of 300 deg.C, and makes it.

The invention belongs to the technical field of power batteries, in particular to a multi-lug cell. The multi-lug cell comprises a cell formed by winding or stacking a positive plate, a diaphragm anda negative plate, a plurality of corresponding positive lugs are arranged on two sides of the positive plate, and a plurality of corresponding negative lugs are arranged on two sides of the negative plate; positive lug groups on two sides of the cell are formed after the positive lugs on two sides of the positive plate are wound or stacked; and negative lug groups on two sides of the cell are formed after the negative lugs on two sides of the negative plates are wound or stacked. The lugs are arranged on two sides, and the lug groups are formed after the lugs are wound or stacked, so that theinternal resistance of the cell is reduced, the discharge capacity of the cell is strengthened, simultaneously, the thickness of the cell is further reduced, the heat dissipation capacity of the battery is improved, and the safety of the battery is strengthened. Moreover, the invention also discloses a multi-terminal battery, a battery module and a preparation method thereof.

The invention discloses a multi-layer chip style of ZnO pressure sensitive resistor made from nanometer materials. It is jointly sintered by the ZnO porcelain material made from nanometer materials and inner electrode layer crossways arranged. Its main characteristic are as follows. The granule shape of the main material of the ZnO porcelain material is orbicular or approximately orbicular. The ZnO nanometer power body of 1 - 99 nm average granule radius, add 3 - 8 % (mol percent) nanometer power body additive whose granule shape is orbicular or approximately orbicular. The said inner electrode layer is Pd/Ag inner electrode layer, in which the Pd proportion is 11 - 25 % of the weight of Pd/Ag inner electrode, and the Ag proportion is 75 - 89 % of the weight of Pd/Ag inner electrode. The ZnO porcelain material and the Pd/Ag inner electrode layer are crossways arranged, and are made by sintering in the temperature bound of 950 - 1100 Deg. C. The present invention also discloses a kind of manufacturing method of the said multi-layer piece style of ZnO pressure sensitive resistor made from nanometer materials. The non-linear coefficient alphaof the multi-layer piece style of ZnO pressure sensitive resistor of 1005 specification made by the present invention is over 20, leaking current IL is less than 2.0 mA.

The invention discloses a three-station isolating switch which comprises a rack, disconnecting links, fixed contacts, grounding contacts and an operating mechanism. The rack is connected with a rotating shaft in a pivotal mode, and the rotating shaft drives the disconnecting links to rotate through first connecting levers and insulating pull rods. The operating mechanism comprises a shell, the shell is connected with a first operating shaft and a second operating shaft in a pivotal mode, and the first operating shaft is fixedly connected with the rotating shaft. The first operating shaft is fixedly connected with a first gear and an isolating limiting plate. The isolating limiting plate is provided with a first positioning hinge pin in a penetrating mode, and the two ends of the first position hinge pin are connected with the first operating shaft through two tension springs. The shell is provided with a switching-on groove, a switching-off groove and grounding grooves which are matched with the first positioning hinge pin. The second operating shaft is fixedly connected with a second gear and a connecting lever, wherein the connecting lever is connected with the shell through a second positioning hinge pin and a compression spring. The shell is provided with a second arc hole which is matched with the second positioning hinge pin. The second gear is not matched with the first gear in a switching-on state and a switching-off state and is matched with the first gear in a grounding state. The three-station isolating switch is compact in structure, reliable in action and convenient to maintain.

The invention discloses a charging bushing for a standby inlet-outlet wire of a high voltage switch device which comprises an isolating tube penetrated with a central conductor; the upper end of the isolating tube is connected with an outer screen; the lower end of the isolating tube is connected with GIS or the insulating salver of a breaker; the lower end of the central conductor is connected with a contact component on the GIS or the isolating salver of the breaker; the upper end of the central conductor is connected with an external inlet-outlet wire to form a main conductive loop; a coaxial double-layered screening component is arranged between the radical directions of the central conductor and the insulating tube; the invention is characterized in that the double-layered screening component is an integral arc screening structure which is connected with the closed ring of the isolating tube; the contact component connected with the lower end of the central conductor is a self-supported contact device. As the integral arc screening structure is adopted in the invention, the middle screening height is greatly reduced; the rigidity of the screening component is increased and the distribution of an electric field at the tail end of the screen is improved. Simultaneously the self-supported contact device is adopted; the discharge current capability is greatly improved; the structure is very simple; the manufacture cost is reduced.

The piezoresistor is fabricated by agglutinating interleaved ZnO porcelain and inner electrode. Main material of the ZnO porcelain is ZnO powder in sub micro of average particle diameter 0.10-0.99 micro. The inner electrode layer is made from palladium and argentine, and palladium is in 3-10% (Wt%) and argentine is in 990-97%. Agglutinating temp is 900-980 deg.C. The invention also discloses method for manufacturing the piezoresistor.

The invention relates to the field of batteries, in particular to an electrode plate and an electrochemical device. The electrode plate comprises a current collector, an electrode active material layer arranged on at least one surface of the current collector, and an electric connection component electrically connected with the current collector, the current collector comprises a supporting layerand a conductive layer arranged on at least one surface of the supporting layer, the thickness D2 of a single surface of the conductive layer satisfies the following formula: D2<=D2<=1. D2 is greaterthan or equal to 30nm and less than or equal to 3[mu]m; the supporting layer is a high polymer material layer or a high polymer composite material layer; the electrode active material layer comprisesan electrode active material, a binder and a conductive agent; seen from the width direction of the coated surface of the electrode plate, the coated electrode active material layer comprises 2n+1 (n=1, 2 or 3) areas based on the compaction density, the compaction density of the middle area is higher than the compaction density of the two side areas, and a support protection layer is arranged on the surface of the extension area of the current collector.

The invention discloses an excimer laser pulsed power source and belongs to the pulse power techniques. The excimer laser pulsed power source resolves the problem that a high-voltage magnetic switch in an existing pulsed power source needs a complex reset circuit, so that the circuit structure is simplified and reliability is improved. The excimer laser pulsed power source comprises an insulated gate bipolar translator (IGBT) switch tube, a switch tube driving circuit, a first-level magnetic switch, a direct current off-center current source, a saturable pulse transformer and a second-level magnetic switch. Due to the fact that the direct current off-center current source is arranged in the first-level magnetic switch compression circuit, the excimer laser pulsed power source is capable of controlling and adjusting the energy transferring efficiency of a primary energy storage circuit, the pulse compression width and pulse delay. By using the secondary winding of the saturable pulse transformer and the particularity that the power-charging voltage direction and the power-discharging voltage direction at two ends of the second-level magnetic switch are opposite, a magnetic core reset circuit is omitted. Due to the fact that the two levels of magnetic switches are both capable of working under a long-term high repetition rate condition, the excimer laser pulsed power source is strong in through-current capability, high in withstand voltage strength, very low in failure rate and basically free from maintenance. The excimer laser pulsed power source is particularly suitable for a short pulse electro-discharge excitation gas laser used for photoetching and requiring an accurate timing control.

The invention discloses a double-acting conductive rod and double-bellow structure vacuum interrupter and a working method thereof. The vacuum interrupter includes a primary bellow, a secondary bellow, a primary conductive rod, a secondary conductive rod, a primary contact for short-circuit breaking and welded to the primary conductive rod, and a secondary contact for large rated current through-flow and welded to the secondary conductive rod. The vacuum interrupter can maintain the high vacuum inside the vacuum interrupter through the double-bellow sealing structure, and the vacuum interrupter loop resistance is greatly reduced through the double action conductive rods and the double-contact structure; and the rated current level of the vacuum interrupter can be significantly improved without affecting the short-circuit fault current breaking performance of the vacuum interrupter.

The invention relates to a wind power station LVRT (Low Voltage Ride Through) device which comprises a wind power station, electric reactors, diodes, adjustable voltage sources, a circuit breaker and a grid system. One adjustable voltage source is connected in parallel with one diode after being connected in series with one electric reactor to form one group of fault current limiting circuit; and after two groups of fault current limiting circuits are connected in series, one end of the obtained circuit is connected with the wind power station and the other end of the obtained circuit is connected with the grid system by the current breaker. The wind power station LVRT device is low in cost and easy to implement. When the LVRT function is implemented, the short current limiting capacity is improved; and by the non delay input of the current limiting electric reactors connected in series, the large-area talk around accident caused by the short circuit inside the wind power station can be avoided. The wind power station LVRT device has low requirement for the control characteristic of a unit plant; and a power electronic valve string of the wind power station LVRT device adopts a diode set string with low cost, large through-current capacity and strong short-time overload capacity, so that the system cost is reduced.

The invention discloses a multipole field breakdown type vacuum trigger switch. In the invention, a top electrode and a bottom electrode of the trigger switch respectively comprise electrode bottom columns, electrode platforms and a plurality of columnar electrodes; the columnar electrodes of the top electrode and the bottom electrode extend in opposite directions and are staggered; gap widths between every two adjacent columnar electrodes are equal and are same as the gap widths between the tops of the columnar electrodes and the corresponding electrode platforms; the electrode platform of the bottom electrode is provided with a notch and a trigger electrode; the trigger electrode comprises a trigger needle and a trigger insulation sleeve ring; the axial section of the trigger needle is T-shaped; the trigger insulation sleeve ring is of a boss structure and embedded in the notch; the trigger needle comprises a trigger needle head and a trigger needle rod; one end of the trigger needle rod is connected with the trigger needle head, and the other end of the trigger needle rod passes through the trigger insulation sleeve ring and the electrode platform; the upper surface of the trigger needle head is lower than the upper surface of the electrode platform of the bottom electrode; and gaps exist between corners and the electrode platform of the bottom electrode. The trigger switchhas long service life and strong through-current capability under the condition of big current.

The invention discloses a method for preparing a direct-current zinc oxide resistance card. The method comprises the following steps of: arranging resistance card green pressing which is subjected to binder removal on a high-temperature ceramic plate with double-layer padding, and covering a high-temperature ceramic crucible on the ceramic plate, so that the green pressing is sealed in space enclosed by the ceramic plate and the ceramic crucible to be sintered in one piece. In the method, the resistance card is in the atmosphere with high bismuth content at high temperature by the design of apadding composition, so that the volatilization of bismuth oxide is inhibited effectively. Compared with the prior art, due to the adoption of a one-time sintering process, a direct-current coating process and a direct-current diffusion process are saved, the problems of the coarsening of crystal boundaries, the increase of leakage current and the influence on the aging resistance of the zinc oxide resistance card due to two-time sintering of the bismuth oxide in the direct-current diffusion process are solved, and the method is low in cost and high in efficiency, and is suitable for industrial production.

The invention relates to a connection structure of a cold-insulation superconducting cable shielding layer current lead and an assembly method thereof. The connection structure comprises an inner sleeve, a conducting taper pipe, a conducting nut, a first fastening flange disc and a second fastening flange disc, wherein the outer wall of the inner sleeve is of a taper-contraction third-order type structure; the conducting taper pipe is a taper pipe, the structure of the inner side wall of the conducting taper pipe is matched with the outer wall of a relative section of the inner sleeve, and a welding cavity is formed between the inner side wall of the conducting taper pipe and the distal end outer wall of the inner sleeve; the length and the taper of the inner side wall of a parent sectionof the conducting nut are consistent with those of the outer side wall of the relative section of the conducting taper pipe; and the first fastening flange for being in threaded connection with the conducting taper pipe and the second fastening flange for being in threaded connection with the conducting nut are respective provided with a group of a screw hole and a through hole for fastening, andthe second fastening flange is further provided with a threaded hole for detaching. The invention further provides the assembly method of the connection structure to realize the connection of each components of the connection structure. The connection structure disclosed by the invention has the advantages of low contact resistance, strong through-current capability and convenience for detaching and assembling.