41results about How to "Restrict flow" patented technology

The present invention relates to a quenching method of acrylonitrile, it is characterized by that in the upper section of quenching tower the acid or mixture of the acid and upper section partial external circulation liquid phase can be directly added on the liquid-collecting disk of its upper section, and the pH value of external circulation liquid can be controlled to 2-5, and in the lower section of the quenching tower a reasonable member is added and the gas-liquid distribution in the tower can be optimized so as to raise recovery rate of acrylonitrile by 4-5%. Said invention can be used in industrial production equipment of acrylonitrile.

The invention discloses a preparation method of a high-bonding-strength and high-precision copper-molybdenum-copper laminated composite, which belongs to the technical field of composite preparation. The method comprises the steps of conducting diffusion welding on three component materials, namely copper, molybdenum and copper, to allow relatively tight surface constraint to be formed among laminates to constrain the flowing of metal in subsequent plastic deformation and allow deformation of each element laminate to be equal to the total deformation of a composite laminate, cold-rolling the copper-molybdenum-copper laminated composite laminate, and applying plastic deformation to increase the gluing rate of atoms between the molybdenum laminate and the copper laminate and then achieve the purpose of further improving the bonding strength. Compared with the prior art, the method has the advantages of high laminate bonding strength, precise laminate dimension, flexible component adjustment, low defect rate, short process and the like, and is suitable for industrialized application.

A partition member (42) is installed between a frame (21) and the stator (33) of an electric motor (24). The partition member (42) establishes communication between a connection passage (26) and a gap (39a) and between a gas passage (40) and a delivery space (16). The refrigerant gas delivered from a compression mechanism (22) entirely flows into the gap (39a) and passes through a communication space (15) and then flows through the gas passage (40) so as to be delivered from a delivery pipe (18).

The invention relates to a blisk electrolytic milling machining system and method adopting auxiliary liquid flushing and belongs to the field of electrolytic milling compound machining. The blisk electrolytic milling machining system adopting auxiliary liquid flushing comprises a power source, a tool cathode (1), a main shaft (6), a blisk blank (2), a supporting shaft (5) and an auxiliary spray nozzle (10). The auxiliary spray nozzle (10) is provided with a section identical with a groove to be machined in shape and is right opposite to a to-be-machined face of the blisk blank (2). The tool cathode (1) is located between the auxiliary spray nozzle (1) and the to-be-machined face of the blisk blank (2), and initial intervals are kept between the tool cathode (1) and the auxiliary spray nozzle (1) and the to-be-machined face of the blisk blank (2). During machining, the tool cathode (1) and the auxiliary spray nozzle (10) supply electrolyte to the machining area of the blisk blank (2) atthe same time, and the pressure of the electrolyte in the auxiliary spray nozzle (10) is larger than that of the electrolyte in the tool cathode (1). By the adoption of the liquid flushing-assisted electrolytic milling machining system and method for the blisk, flow of the electrolyte in a machined area can be effectively restrained, the flow field uniformity in the machining intervals is improved, and the electrolytic milling machining efficiency and stability of the blisk are improved.

A grounding system suitable for urban rail transit. The working grounding device is composed of: symmetrical working grounding points are arranged on the left and right sides of the car body, and each working grounding point is electrically connected to switches, carbon brushes and wheel sets in sequence; The grounding device is composed of: symmetrical protective grounding points are arranged on the left and right sides of the car body, and each protective grounding point is electrically connected to the control switch, power diode, grounding carbon brush and wheel set in sequence; the automatic control system is used to regulate the above two grounding points. The current of the device makes the currents on the two rails approximately equal. The protection grounding of the present invention adopts a power diode, which limits the current from flowing into the rail from the car body, avoids the damage of the weak point equipment on the car due to the return flow of the rail, and makes the currents on the two rails equal in size through the automatic control system, which improves the safety of the train sex.

The invention relates to an LDMOS device and a manufacturing method thereof. An LDMOS device comprising a substrate, a drift region on the substrate, the drift region including a source region and a drain region; and a trench surrounding the drift region, the depth of the trench being greater than that of the drift region depth. Because its trench surrounds the drift region, it can limit the hole current in the electron-hole pairs generated by the LDMOS device at high temperature from flowing to the substrate, that is, it can effectively isolate the LDMOS device from the peripheral logic circuit and avoid the occurrence of crosstalk. In addition, a manufacturing method of the LDMOS device is also provided.

The invention discloses an excellent planting method of selenium-enriched Moringa oleifera, which includes seed soaking, seedling cultivation, seedling screening, land consolidation, soil fertilization, sapling planting, selenium-enriched liquid spraying, and regular finishing process steps; On the basis, a pot-making device is used to select soil samples, and the Moringa seeds are planted and cultivated in the planting holes on the upper part of the selected soil samples, so that the same batch of planted Moringa seeds can be cultivated in a concentrated manner, which is convenient during the cultivation of Moringa seeds. The unified management of Moringa seeds greatly improves the survival rate of seedlings, and the surface of seedlings is regularly sprayed with selenium-enriched liquid mixed with purified water, so that the Moringa obtained after the seedlings grow is rich in selenium, increasing the At the same time, the protective bracket is used to protect the seedlings, which further consolidates the stability of the seedlings during the development period, contributes to the healthy growth of the seedlings, and reduces the interference of the external environment.

The invention discloses a hole-retaining occluder for ventricular septal defect, which comprises a left disk and a right disk for blocking the gap, and a frustum-shaped blocking part located between the left and right disks to block the ventricular septal defect, and the diameter of the frustum-shaped blocking part is relatively small. The large end is connected to the left disk, and the through hole that runs through the above-mentioned left disk, right disk and the frustum-shaped blocking part; the diameter of the left disk is equal to the diameter of the right disk, and the diameter of the left disk is greater than the diameter of the frustum-shaped blocking part; The right disk, the frustum-shaped blocking part and the through hole are all formed by a plurality of memory alloy wires; the memory alloy wire passes through the through hole to form the hole wall of the through hole, and is wound to form the left disk, the right disk and the frustum-shaped blocking part. Both ends of the memory alloy wire are fixed on the same fixture that constrains the memory alloy wire; multiple memory alloy wires are interlaced to form an elastic net, and a sealing film is arranged inside the elastic net. The aortopulmonary artery shunt is limited, and the volume overload and pressure transmission of the pulmonary vessels are reduced, so that the high pressure of the right heart system has room to release.

The invention discloses a flue gas baffle device inside a horizontal waste heat boiler, and aims to solve a 'flue gas corridor' problem caused by short circuit of flue gas of the horizontal waste heat boiler. The flue gas baffle device inside the horizontal waste heat boiler comprises multiple rows of heated surface tube bundles arranged inside a flue, wherein the two ends of each row of the heated surface tube bundle are connected with corresponding headers; a plurality of inter-tube baffles are arranged inside the flue; each inter-tube baffle is parallel to the extending direction of the flue; a plurality of tube holes are formed in each inter-tube baffle; each heated surface tube bundle vertically penetrates through the corresponding tube holes and is fixed with the inter-tube baffles through sleeves; and side wing baffles are arranged between the heated surface tube bundles and the inner wall of the flue. The flue gas baffle device inside the horizontal waste heat boiler achieves uniform distribution of the flue gas in the flue and sufficient scouring of the flue gas to the heated surface tube bundles, so that the heat exchange efficiency of the boiler is improved, and the safe and stable running of the boiler is ensured.