10results about How to "Improve the withstand voltage level" patented technology

The present application relates to a kind of oil pipe dosing device, to solve the problem of traditional dosing method medicament uniform dispersion to the bottom of oil pipe.The device includes oil pipe, adjacent oil pipe male oil pipe joint and female oil pipe joint are threadedly connected;N connection flat tubes, which are closely attached to the outer wall of the oil pipe, the n connection flat tubes are connected into a complete annular sleeve in the circumferential direction of the oil pipe, and n is an even number;Wherein, from the female oil pipe joint to the extension direction of the oil pipe body, the width of the inner cavity of the connection flat tube gradually decreases along the radial direction of the oil pipe, so that the inner cavity of the connection flat tube forms an expanded diameter structure at the connection of the upper and lower adjacent oil pipes;The connection flat tube is made of wear-resistant and corrosion-resistant composite material, and an antistatic coating is provided on the outer side wall of the connection flat tube.The present application does not need to modify the existing oil pipe structure, and the modular design improves the installation efficiency, is suitable for thick oil, high sulfur / wax oil well, can reduce the load of pumping equipment, and prolong the service life of oil pipe.

The utility model provides a kind of load device for high-voltage power supply test, including insulating box, programmable logic controller PLC and processing unit. Insulating box is equipped with liquid level detection component and resistance module, and is loaded with insulating liquid. Liquid level detection component detects the liquid level in insulating box. Programmable logic controller PLC is connected with liquid level detection component, and normal liquid level value is set. Processing unit is controlled by programmable logic controller PLC, and processing unit is connected with the output end of programmable logic controller PLC by first intermediate relay, and first intermediate relay has the open circuit state of path state connected with processing unit and disconnected with processing unit. Liquid level detection component detects that liquid level does not reach normal liquid level value, and first intermediate relay is in path state, and processing unit works, and insulating liquid is injected into insulating box;Liquid level detection component detects that liquid level reaches normal liquid level value, and first intermediate relay is in open circuit state, and processing unit does not work.

This application relates to the field of material sealing technology, and particularly to a high-performance insulating ceramic sealing method for neutron tubes. The method includes: sequentially performing organic solvent ultrasonic cleaning and argon plasma etching activation treatment on the sealing surface of a cylindrical high-purity alumina ceramic part, followed by magnetron sputtering deposition of a titanium transition layer to obtain a ceramic part with a titanium transition layer; acid washing to remove the oxide layer from the sealing surface of a Kovar alloy cylindrical flange, followed by cleaning and drying to obtain a metal sealing part; preparing an active brazing filler metal sheet; sequentially assembling the sheet to form a pre-assembled assembly; placing the pre-assembled assembly in a vacuum brazing furnace, applying axial preload to complete the sealing, followed by controlled cooling to form a sealing part with an airtight brazed joint; and annealing to obtain the finished sealing assembly. This method solves the problems of low dielectric strength, large differences in thermal expansion coefficients, and difficulty in controlling interface quality in existing technologies.

An electrical connector device belongs to the technical field of battery energy source. It comprises a shell and a shell cover, and further comprises a pair of power terminals, a signal terminal and an explosion-proof valve. The pair of power terminals are symmetrically arranged at the middle positions of the shell cavity. The explosion-proof valve and the signal terminal correspond to the middle positions of the pair of power terminals and are separately arranged at the upper and lower parts of the pair of power terminals. The shell is formed with a gas permeable hole at the middle of the bottom side wall. The power terminals, the signal terminal and the explosion-proof valve are arranged through the shell cavity. An insulating plate covering the explosion-proof valve is arranged at the upper position in the shell cavity. The shell is provided with a signal wire clamping groove on the top side wall corresponding to the signal terminal, and power wire positioning grooves are formed at the left and right sides of the signal wire clamping groove. The signal wire is connected with the signal terminal and is led out of the shell through the signal wire clamping groove. Advantage: The modular structure design solves the problems of layout confusion, complex installation and safety hazards in the prior art.

The utility model relates to the technical field of PFA hand valves, in particular to a PFA hand valve which comprises a hand valve body, and a sealing operation mechanism is arranged in the hand valve body and a valve cover. According to the manual valve, the leakage risk is reduced when the manual valve is used, the pollution problem of a traditional valve in a high-purity scene is solved, meanwhile, the annular sealing groove is designed in the contact face of the manual valve body and the diaphragm, the pressure resistance grade is remarkably improved, and due to the streamline design and the smooth flow channel surface of an internal flow channel of the manual valve body, the sealing performance is improved. The flow resistance of fluid in the manual valve body is remarkably reduced, fluid turbulence is reduced, pressure loss is reduced, the response speed is increased, the anti-skid design is arranged on the surface of the operating handle, friction force is increased, slipping during operation is prevented, the operation comfort can be improved, the operating handle and the diaphragm are connected through the high-strength corrosion-resistant piston, and the service life of the operating handle is prolonged. And the service life of the manual valve is longer.

According to the circuit board and the circuit breaker in mortise and tenon connection, the ceramic capacitors are combined in series and in parallel, the ceramic capacitors with corresponding capacitance values are selected for voltage division according to the final capacitance value to be reached, and the voltage withstand level of the whole capacitor is remarkably improved, so that the national standard thunder and lightning pulse test requirements are met; the plurality of ceramic capacitors in each group of units are connected in parallel, so that voltage stress can be dispersed, the pressure burden of a single capacitor is reduced, the one-to-one corresponding connection between the adjacent units ensures uniform voltage distribution, and some capacitors are prevented from bearing overhigh voltage. Furthermore, by adopting an assembly mode of a tenon-and-mortise structure, the space interference with other functional parts on the pole is avoided, and the matching with the installation space of the existing pole is realized.

The invention belongs to the technical field of electrical materials, and discloses a process method for improving the pressure resistance of a copper-chromium contact prepared from a vacuum casting base material, which comprises the following steps: preparing a copper-chromium contact part and carrying out a pressure resistance test, recording a pressure resistance result, carrying out solid solution and aging treatment on the copper-chromium contact part, and obtaining the pressure resistance of the copper-chromium contact part. The copper-chromium contact part subjected to solid solution and aging treatment is subjected to accurate grinding treatment, the surface of the copper-chromium contact part subjected to ultrasonic treatment is covered with industrial alcohol, ultrasonic treatment is carried out, the copper-chromium contact part subjected to ultrasonic treatment is put into a temperature constant-temperature box to be dried, then a voltage withstanding test is carried out, and a voltage withstanding test result is recorded. Through solid solution aging, accurate grinding, ultrasonic treatment and drying treatment, the internal grain structure of the copper-chromium contact is homogenized, the surface roughness of the contact is obviously reduced, the surface quality of the contact is improved, the voltage withstanding level of a part is improved, the surface roughness is kept to be smaller than or equal to Ra2, and therefore the breakdown voltage of the part is improved.

The application provides a high-voltage GaN-based double-channel super-junction HEMT device and a preparation method thereof, and belongs to the technical field of semiconductors, and is used for solving the problem of the voltage resistance of a modulated GaN HEMT device. The high-voltage GaN-based double-channel super-junction HEMT device comprises a main body structure, a source structure, a drain structure and a gate structure. The main body structure comprises, from bottom to top, a substrate, a buffer layer, a back barrier layer, a channel layer, a barrier layer and a passivation layer. The barrier layer and the channel layer interface generate two-dimensional electron gas. The channel layer and the back barrier layer interface generate two-dimensional hole gas. The upper part of the source structure forms ohmic contact with the two-dimensional electron gas. The lower part of the source structure forms ohmic contact or Schottky contact with the two-dimensional hole gas. The drain structure forms ohmic contact with the two-dimensional electron gas. The gate structure is arranged between the source structure and the drain structure and is connected to the barrier layer. The voltage resistance level of the device can be improved without affecting the conduction characteristics of the device.

This invention discloses a method and system for suppressing capacitor voltage fluctuations in a modular multilevel converter (MMC), belonging to the field of power electronics technology. The system includes a main MMC circuit and a dual bandpass filter module. The MMC main circuit consists of a three-phase bridge arm group, bridge arm inductors, and several sub-modules. The dual bandpass filter module consists of a first bandpass filter and a second bandpass filter, both employing a series inductor and capacitor topology, and are directly connected in parallel with the capacitors of each sub-module. The center frequency of the first bandpass filter matches the fluctuation component corresponding to the fundamental frequency of the MMC sub-module capacitor voltage, and the center frequency of the second bandpass filter matches the fluctuation component corresponding to the second harmonic frequency of the sub-module capacitor voltage. This invention requires no complex control algorithm, has a simple structure, can significantly reduce the capacitor voltage fluctuation amplitude, and reduces the capacity required for sub-module capacitor selection, making it suitable for various MMC application scenarios.

The application discloses a kind of annular fracturing gas lift liquid discharge pipe columns and operating methods, including multiple groups of gas lift tools and throttling tools, when annular injection gas, gas enters cavity from the gap between the body of gas lift tool and gland, when injection pressure is greater than the pressure in gas cavity, lower valve body is pushed up, and the disengagement between upper ball valve and bidirectional valve seat, injection gas enters the tubing through bidirectional valve seat, and the liquid in the tubing is discharged by the gas lift tool;When injection pressure is lower than the pressure in gas cavity, upper ball valve is seated in bidirectional valve seat, and oil, casing passage is blocked, injection gas pushes annular fluid surface down, and the process of lower gas lift tool is repeated to open the liquid discharge operation, until the liquid in the tubing is discharged completely by the lowermost gas lift tool.The pipe column can realize rapid liquid discharge after fracturing, without well killing, down liquid discharge pipe column completion, avoid the damage to reservoir by well killing, ensure the modification effect, effectively improve the construction efficiency, reduce the operation cost.