38results about How to "Guaranteed flow area" patented technology

The invention discloses a rotor end surface temperature measuring device for traction type molecular pumps. The rotor end surface temperature measuring device comprises an outer shell, a rotor, an end face flange, the first-stage molecular pump, the third-stage molecular pump and the second-stage molecular pump, wherein the third-stage molecular pump is in interference fit connection with the first-stage molecular pump; a screw is screwed into an end face flange threaded hole of the end face flange through a third-stage molecular pump connecting hole in the circumference of the third-stage molecular pump; the protruding end of the screw is located in a screw connecting hole in the circumference of the second-stage molecular pump; a transition part is fixed to the interior of an assembly threaded hole of an assembly stepped hole through external threads, and the free end of the transition part is located in a transition part insertion hole; an infrared probe in a temperature measurement assembly is screwed into an assembly screw hole of the transition part and is fixed to the third-stage molecular pump through the transition part. The temperature measurement assembly can be conveniently disassembled or assembled under the condition of guaranteeing the dynamic clearance of the second-stage molecular pump and the dynamic clearance of the third-stage molecular pump, and therefore the open area and pumping efficiency of a pumping tank are guaranteed.

The invention discloses a battery cell tab connecting structure which comprises tabs and busbars. Through holes matching the tabs are formed in the busbars; the through holes correspond to the tabs; one end of each tab is connected with a battery cell, and the other end of the tab is inserted into the corresponding through hole in a busbar; the tabs and the busbars are connected through laser welding at the through holes. The invention further provides a soft package battery which comprises the battery cell tab connection structure, electric equipment, an electric vehicle and a power station. According to the battery cell tab connecting structure, the soft package battery, the electric equipment, the electric vehicle and the power station, which are provided by the invention, the busbarover-current area is not occupied; the busbars and the tabs are firmly welded; pseudo soldering can be avoided; and the welding quality is convenient to detect.

The utility model relates to the technical field of battery energy, in particular to a battery cell and a battery. The battery cell comprises a battery cell body and at least three tab assemblies, the tab assembly is positioned at the end part of the battery cell body, comprises a plurality of tabs which are arranged in a stacked manner, and is provided with an overcurrent area; the size of the tab in the length direction of the pole piece is less than or equal to 45mm; the total area S of the overcurrent areas of all the tab assemblies meets the condition that S is greater than or equal to I / (K * F); wherein I is the maximum current threshold value allowed to pass through in the overcurrent region, K is the current-carrying capacity per unit area in the overcurrent region, and F is a correction coefficient; k is greater than or equal to 5A / mm < 2 > and less than or equal to 10A / mm < 2 >, I is greater than or equal to twice of the standard capacity of the battery, and the value range of F is 0.5-0.9. According to the battery cell provided by the invention, the tabs are not easy to fold, and after the battery cell is arranged in the battery, the over-current capability of the battery can be met, and the temperature rise of the battery in the charging and discharging process is reduced.

The invention discloses a mixed transportation pump which comprises a cylinder. A left end cover is arranged at one end of the cylinder, the other side of the left end cover is communicated with an outlet pipeline, and an oil tank and a bearing pedestal are arranged at the other end of the cylinder. A rotor and a crankshaft are arranged in an inner cavity of the cylinder. The crankshaft is arranged in the horizontal direction, the rotor does plane swing along with the crankshaft, and the outer wall of the rotor and the inner wall of the cylinder are kept tangent all the time. Rolling bearings are arranged between the rotor and the crankshaft, and the rotor is in close fit with the crankshaft through the rolling bearings. According to the mixed transportation pump, all components are well lubricated, the service life of the whole pump is prolonged, and guarantees are provided for application of the multiphase mixed transportation technology to oilfield exploitation and oil-gas mixed transportation.

The invention relates to the technical field of science and education tools, and discloses an artificial wetland model. The artificial wetland model comprises a water storage device, a water inlet pipe, a color developing agent and at least one simulated wetland unit, wherein the water storage device used for containing sewage; the color developing agent is used for being added into the sewage fora color developing reaction with pollutants in the sewage; the simulated wetland unit comprises a container, a matrix and wetland plants; the container is in the shape of a box with an opening in thetop, and a water outlet is formed in the side of the container; the water inlet pipe is connected with a water pump, two ends of the water inlet pipe are respectively introduced into the water storage device and the container; the matrix is laid in the container; the wetland plants are planted on the matrix; and the water storage device communicates with the water outlet to collect sewage flowingthrough the container. The sewage can circularly flow in the model, so the model disclosed by the invention can simulate the operation of a real constructed wetland, the purification function of thewetland is intuitively expressed through the color difference of the water storage device, the interestingness and participation of science popularization activities are increased, and the operationalability of a taught person is improved. The invention further provides an operation method of the constructed wetland model.

The invention provides a same-floor drainage system of a toilet without slab lowering. The same-floor drainage system of the toilet without slab lowering is composed of a drainage vertical pipe, a sewage transverse branch pipe, a waste water transverse branch pipe, an integrated water seal, a floor drain, a ground floor slab and a floor decoration layer; the drainage vertical pipe penetrates through the ground floor slab; a water seal channel of the integrated water seal is arranged in a ground floor slab, the transversely-closed bottom outer wall does not penetrate through the ground floor slab; at least two openings, of the integrated water seal, above the ground floor slab communicate with and are converged to be connected with the water seal channel; and a waste water transverse branchpipe connector is connected with the floor drain and a wash basin pipeline, and the floor drain and the wash basin pipeline are not provided with traps or water seal devices. According to the same-floor drainage system of the toilet without slab lowering, the problems that a floor slab needs to be lowered during same-floor drainage of a traditional building, the traps which are arranged below alldrainage points are prone to drying up to cause odor return can be solved, and the effects that same-floor drainage does not need slab lowering, a toilet does not have peculiar smells, and the pipeline is easy to overhaul are achieved.

The invention relates to a pipeline type steam filter screen with a double-funnel structure, which can guarantee the whole flow area and has the characteristics of being convenient to assemble and disassemble, simple in structure and low in cost. According to the technical scheme, the pipeline type steam filter screen is characterized by comprising a funnel-shaped outer net and a funnel-shaped inner net, wherein the diameter of the outer net is gradually reduced from the bottom end to the top; the bottom end of the outer net is provided with a flange ring, and a mouth part on the top of the outer net is connected with the top of the inner net; the inner net extends into the outer net downward; and the diameter of the inner net is gradually reduced from the top to the bottom end.

The invention relates to a duralumin pole piece and a battery module. The duralumin pole piece includes total output pole pieces, double-row duralumin pole pieces and a single-row duralumin pole piece. Each total output pole piece includes a rectangular duralumin pole piece and an embossed teeth equipped hexagonal head screw that are combined together by a pressure riveting process, and is used for electric connection with a post terminal serving as a total output pole of the battery module. Each double-row duralumin pole piece is an H-shaped structure composed of one connecting part and two welding parts, and is used for electrically connecting a plurality of post terminals of two adjacent columns of batteries in the battery module. The single-row duralumin pole piece is used for used forelectric connection of other post terminals except the total output pole in the outermost two columns of battery post terminals in the battery module. The rectangular duralumin pole pieces, the single-row duralumin pole piece and the double-row duralumin pole pieces are all coated with wiredrawing surfaces. The battery module consists of a battery pack, packing straps and a duralumin pole piece,and the duralumin pole piece and the battery pack adopt laser welding. The duralumin pole piece and the battery module provided by the invention have the advantages of high production efficiency, lowproduction cost, simple and convenient welding, and high welding reliability.

The invention discloses a mixed transportation pump which comprises a cylinder. A left end cover is arranged at one end of the cylinder, the other side of the left end cover is communicated with an outlet pipeline, and an oil tank and a bearing pedestal are arranged at the other end of the cylinder. A rotor and a crankshaft are arranged in an inner cavity of the cylinder. The crankshaft is arranged in the horizontal direction, the rotor does plane swing along with the crankshaft, and the outer wall of the rotor and the inner wall of the cylinder are kept tangent all the time. Rolling bearings are arranged between the rotor and the crankshaft, and the rotor is in close fit with the crankshaft through the rolling bearings. According to the mixed transportation pump, all components are well lubricated, the service life of the whole pump is prolonged, and guarantees are provided for application of the multiphase mixed transportation technology to oilfield exploitation and oil-gas mixed transportation.

The invention discloses an array type connection structure and electronic equipment, and belongs to electronic devices. The array type connecting structure comprises a support and a plurality of connecting assemblies. The support is used for fixing a plurality of connecting assemblies which are sequentially arranged at intervals in the length direction of the support, and no signal wire is arranged in the support. Each connecting assembly penetrates through the bracket; the first side of each connecting assembly is provided with a connector interface, the connector interface comprises a plurality of first signal terminals, and the connector interface is used for being connected with a first electronic device located on the first side of the support; the second side of each connecting assembly is directly connected with a plurality of cables, the plurality of cables are in one-to-one correspondence with the plurality of second signal terminals of the connecting assemblies, and the cables are used for being connected with second electronic devices located on the second side of the support; the support is provided with a heat dissipation through hole, and at least part of the heat dissipation through hole is located between the two adjacent connecting assemblies. The array type connection structure provided by the embodiment of the invention can have a good heat dissipation effect.

The invention discloses a safe operation tubular column for a carbon dioxide injection well and an operation method, a tubing hanger is hung at the upper end of a casing head, a load test short section is connected below the tubing hanger, and the load test short section is sequentially provided with a sliding sleeve valve, an upper centralizer, a releasing packer, a lower centralizer, a gas injection valve, a tail short section and a screwed plug towards the lower tubular column. After the pipe column enters a well, the annulus protection fluid is positively injected for fluid replacement; a constant-pressure valve ball is put in, and the sealing performance is checked through step-by-step positive pressure; a tubing hanger is seated after pressure relief; the releasing packer is set through positive pressure, then pressure is continuously increased to break the valve seat thin-wall section of the constant-pressure valve seat, and positive injection communication of the tubular column is achieved; and then water is squeezed forwards, after the sealing performance of the packer is verified, a wellhead is installed and connected with a ground process, carbon dioxide is injected forwards, and soaking is conducted after the carbon dioxide reaches the set gas injection amount. The tubular column does not overflow in the process of descending into a well, after positive replacement, a ball is thrown to press and set a packer, a shaft is protected, dirt deposition is prevented, the risk of breakage and falling of the tubular column is completely eradicated, and the operation process is safe and controllable.

The invention provides a real-time clearing device for carbon black in tire oil refining. The real-time clearing device effectively solves the problems that in the prior art, the inner wall of a pipeline for conveying high-temperature oil gas cannot be cleaned in real time, the high-temperature oil gas is easily attached to the inner wall of the pipeline, and through-flow of the pipeline is seriously influenced. According to the technical scheme for solving the problems, the real-time clearing device comprises a hollow cylinder, a rotating shaft is arranged on the side wall of the hollow cylinder, a plurality of flat plates are arranged in the hollow cylinder, a rotating disc is arranged on the outer side of the hollow cylinder, an annular cylinder is arranged on the outer side of the hollow cylinder, a plurality of worm and gear mechanisms are arranged in the annular cylinder, worm gears are hinged to the inner side of the annular cylinder, worms are arranged along the hollow cylinder, an arc-shaped groove is formed in the rotating disc, deflector rods are arranged on the end surfaces of the worm gears, friction discs are arranged on the outer sides of the two ends of the hollow cylinder, inner gear rings are arranged on one sides of the friction discs, pinions are fixed to the two ends of the worms, an outer cylinder is arranged on the outer side of the annular cylinder, two annular plates are arranged in the annular interval, an outer gear ring is arranged on the outer side of the annular cylinder, a plurality of transmission gears are arranged between the two annular plates, a plurality of sliding rods penetrate through a conical cylinder, and friction wheels are fixed to the ends, close to the hollow cylinder, of the sliding rods.

The invention discloses a replenishing valve for a hydraulic system of a press. The replenishing valve comprises a valve spool, a valve seat, a valve spool control body, a connecting rod, a return spring, a locking nut, a spring pressing cover and a guide sleeve. The replenishing valve is characterized in that the return spring is fixedly arranged in the valve seat through the spring pressing cover, the valve spool extends into the return spring through the guide sleeve, and the valve spool control body is connected with the valve seat through the connecting rod and the locking nut. The replenishing valve is simple in structure, convenient to assemble and disassemble and large in through-flow area.

The utility model discloses a single battery, a battery pack and an electric device. The single battery comprises a shell, an electrode assembly, a first cover plate and a first collector plate, the first flow collecting disc comprises a connecting piece and an elastic piece; the elastic part comprises a deformation part and a conductive part, the deformation part comprises a first section and a second section which are mutually connected, one end of the first section away from the second section is connected with the connector, the second section is bent relative to the first section, and one end of the second section away from the first section is connected with the conductive part. According to the first current collecting disc, the elastic piece is arranged, so that the battery has tolerance absorption capacity when being sealed, assembled and welded, and the yield loss is reduced; the deformation part of the elastic piece comprises the first section and the second section, and the first section and the second section are bent, so that the deformation capability of the elastic piece can be improved, and the connection between the connecting piece and the electrode assembly cannot be influenced.

The invention discloses a through hole geopolymer sand filter pipe. The through hole geopolymer sand filter pipe comprises a base pipe and a filter layer; the filer layer is a through hole geopolymerfilter layer; a slotted hole is formed in the base pipe; the through hole geopolymer filter layer covers the slotted hole completely when arranged on the outer wall of the base pipe in a sleeving mode; at least one consolidating sleeve is arranged on the outer wall of the through hole geopolymer filter layer in a sleeving mode and connected to the outer wall of the through hole geopolymer filter layer through a heated adhesive; and the upper end and the lower end of the through hole geopolymer filter layer are connected with an upper protection cover and a lower protection cover through adhesives correspondingly, and the upper protection cover and the lower protection cover are both welded to the base pipe. The slotted hole is reasonable in design; the filter layer is made of a geopolymermaterial, and the through hole geopolymer sand filter pipe has obvious advantages the filter layer is mounted and connected in the mode that the unconventional adhesives are heated for consolidating,and the strength of the consolidating part is high; and the multiple consolidating sleeves are arranged on the outer wall of the filter layer, so that the strength of the consolidating part is improved again while the strength of the filter layer is improved.

The utility model discloses a connecting structure of a collector plate and a pole of a cylindrical battery, the cylindrical battery comprises a shell with a hollow structure, the pole is arranged in the middle of one end face of the shell, the pole and the shell are coaxially arranged, a through hole is formed in the pole along the axial direction of the pole, and the through hole comprises an outer side hole and an inner side hole connected with the outer side hole; a naked battery cell is arranged in the shell, a first full tab is arranged on one side, corresponding to the pole column, of the naked battery cell, a current collecting plate is electrically connected to the first full tab, a lug boss is arranged on the current collecting plate corresponding to the inner side hole, and the lug boss is embedded in the inner side hole so as to realize limiting sealing connection. According to the utility model, the lug boss is embedded in the inner side hole, and the limiting and sealing connection is realized, so that the lug boss and the pole are accurately positioned, the connection consistency of the pole and the collector plate is improved, in addition, as the lug boss is arranged in the middle of the collector plate, the thickness of the middle of the collector plate can be increased, and the collector plate is not easy to deform when being jacked by a clamp; and the connecting surface of the lug boss and the inner side hole is larger, so that the overflowing area is ensured.

The invention discloses a recirculation intake pipe fitting with a guiding function, which includes a main pipe, and a first ring road and a second ring road are sheathed on the outside of the main pipe, and the first ring road and the second ring road are connected with the main pipe. A first ring channel cavity and a second ring channel cavity are formed between the pipes, and the first ring channel and the second ring channel are connected by a ring plate, and the ring plate is uniformly provided with circulation holes along the circumference. The side wall of the pipeline is also provided with an annular groove communicating with the second ring channel cavity. The annular groove is arranged obliquely along the side wall of the main pipeline. An air inlet pipe is vertically arranged outside the first ring road. The air inlet pipe is connected to the first ring road cavities connected. The air inlet pipe adopts the decompression structure of the side-by-side two-stage ring cavity, which is compact in structure, reduces the airflow loss while decompressing, and prevents the recirculation gas from entering the main flow channel. The inclined design of the annular groove has a guiding effect on the airflow, and It is convenient for processing and avoids adverse effects on the working efficiency of the supercharger compressor impeller due to the pressure and inlet angle of the recirculating gas.

The invention relates to the technical field of switch blades, and provides a movable end switch blade and a switch blade type load switch. The movable end switch blade includes: a switch blade body, one end of which is provided with a mounting hole for connecting the switch blade body to a suitable On the matching seat; arc-resistant head, made of arc-resistant material, installed on the end of the switch knife body facing away from the installation hole, used to contact with the static end switch knife to realize the conduction of the circuit; arc-leading body, located at Near the critical position between the switch knife body and the arc-resistant head, it is installed on the side of the switch knife body or the arc-resistant head, or the arc-starting body is formed by a protrusion on the arc-resistant head facing the side of the static end switch knife; the arc-starting body When the switch is closed, it is first close to the static end switch knife, and when the switch is opened, it is last away from the static end switch knife. The moving end switch knife and the switch knife type load switch in the present invention can solve the problem of low switch safety and reliability caused by arc ablation switch knife in the prior art.

The present disclosure relates to the field of battery technology, and discloses a battery pack; the battery pack may include a battery cell, a bus bar, and at least two first welding connections; the battery cell includes a battery shell; the material of the bus bar is different from that of the battery shell, and the melting point of the bus bar is lower than that of the battery shell; at least two first welding connections are connected between the bus bar and the battery shell, and the spacing between two adjacent first welding connections is greater than or equal to 4mm and less than or equal to 45mm. The battery pack connects the bus bar and the battery shell through at least two first welding connections, which can reduce the welding time required to form a first welding connection, so that the energy brought by the welding can be dispersed to a certain extent to prevent the occurrence of poor welding penetration; and the connection strength and flow area between the bus bar and the battery shell can be guaranteed.

The invention discloses a traction type molecular pump embedded in a device, which comprises a shell with a rotor installed inside, a first-stage molecular pump whose inner wall forms a helical suction groove and is coaxial with the rotor; and is interference-connected with the first-stage molecular pump The upper end surface of the third-stage molecular pump forms an upper annular flange, the lower end surface forms a plurality of air extraction grooves, a central through hole is formed in the middle, the inner wall of the central through hole forms a spiral air extraction groove, and the lower part of the third-stage molecular pump forms a ring Shaped assembly grooves; the lower end surface of the ring-shaped second-stage molecular pump that is interference-fitted with the assembly groove in the third-stage molecular pump forms a plurality of suction grooves, and the edge of the second-stage molecular pump forms a plurality of holes corresponding to the screw holes. groove. The invention has the characteristics of low processing cost and easy processing and installation; and the invention utilizes the characteristics of the high-speed rotation of the rotor itself, and can make the pressure in the device reach 10 without further improving the external evacuation capacity. -3 State of Pa.

The invention discloses a method and device for manufacturing a refractory ceramic cyclone cylinder. The device is used for reasonably separating an existing integral cyclone cylinder and comprises two main components which are a cyclone and a cylinder. The components are mechanically manufactured, have stable size uniformity and can be directly combined. The cyclone is manufactured through mechanical pressing. The curvature of vanes and the inclination angle of the vanes can keep completely parallel to one another, so excellent flow guiding effects can be ensured. The vanes are directly connected with the cylinder walls on the two sides without large circular angle transition connection. Consequently, the flow area of air guide holes is guaranteed, cracks caused by internal stress in the firing process are avoided, and the yield rate is greatly improved. The cylinder is manufactured through mechanical spinning. The wall thickness of the cylinder is uniform, and the circular degree of the cross section of the cylinder is good in quality. The cyclones with various diameters can be flexibly produced by changing the molds, and the cyclones with the large diameter ranging from 500 millimeters to 800 millimeters can be produced.

The invention discloses a low-permeability reservoir carbon dioxide drive under-pressure operation pipe column and an operation method. The pipe column sequentially comprises a high-pressure screwed plug, a tail pipe, a gas injection valve, a tungsten plating and permeating oil pipe, a lower centralizer, a releasing packer, an upper centralizer, a sliding sleeve valve and an air sealing oil pipe from bottom to top. A tubular column enters a well during operation under pressure, and annulus protection fluid is positively injected for fluid replacement; a constant-pressure valve ball is put in, positive pressing is carried out step by step, and the sealing performance of the tubular column is checked; slowly setting a tubing hanger after pressure relief; then positive pressure is applied to enable the releasing packer to be set, then pressure is continuously increased to break the valve seat thin-wall section of the constant-pressure valve seat, and positive injection communication of the tubular column is achieved; and then water is squeezed forwards, after the sealing performance of the packer is verified, the ground process is connected, carbon dioxide is injected forwards, the carbon dioxide enters a shaft annulus and a stratum, and well closing is conducted after the set gas injection amount is achieved. The device can meet the requirement for under-pressure operation, overflow is avoided in the well descending process, after positive replacement, a ball is thrown to press and set a packer, a shaft is protected, dirt deposition is prevented, and the whole operation process is safe and controllable.

The invention provides a real-time cleaning device for an oil-gas pipeline of a tire oil refining reaction kettle, and effectively solves the problems that in the prior art, the inner wall of a pipeline for conveying high-temperature oil gas cannot be cleaned in real time, attachment to the inner wall of the pipeline is easily caused, and the through-flow of the pipeline is seriously influenced. According to the technical scheme, the device comprises a hollow cylinder, a plurality of rotating shafts penetrate through the side wall of the hollow cylinder, a plurality of flat plates are arranged in the hollow cylinder, a first gear is arranged on the outer side of the hollow cylinder, the first gear is provided with a rack, a plurality of rectangular blocks are arranged on the outer side of the hollow cylinder, and a cross rod is arranged at the end of the rack; an annular cylinder is arranged on the outer side of the hollow cylinder and fixed to the hollow cylinder. The outer side of the annular cylinder is sleeved with an outer cylinder, two annular plates are arranged between the outer cylinder and the annular cylinder, an outer gear ring is fixed to the outer side of the annular cylinder, a plurality of transmission gears are arranged between the two annular plates, the transmission gears and the outer gear ring are in transmission through staggered shaft bevel gears, and wheels are fixed to the two ends of a center shaft of each transmission gear. Two ends of the hollow cylinder are connected with conical cylinders through bearings.

The invention discloses a floor socket with an electrical modular replacement function. The floor socket comprises a fixing device, a detection device, a transmission assembly, a power device and a reversing device, wherein the fixing device is connected with the detection device, the transmission assembly is connected with the fixing device, the power device is connected with the fixing device, the transmission assembly is connected with the power device, the reversing device is connected with the fixing device, the fixing device comprises a cover plate, a shell and a mounting plate, the lower side of the cover plate is fixedly connected with the shell, a mounting groove is formed in the cover plate, an air chamber is arranged on the shell, an opening is formed in the upper side of the air chamber, the mounting groove is communicated with the air chamber, rotating shafts are arranged on the two sides of the mounting plate, rotating grooves are formed in the two sides of the mounting groove, the mounting plate is rotationally connected with the rotating grooves through the rotating shafts, the power device comprises a driving motor and a transmission gear pair, a transmission groove is formed in the shell, the driving motor is arranged in the transmission groove, and a shell of the driving motor is fixedly connected with the transmission groove.

The invention discloses a disc spraying device. The device comprises a supporting part arranged in the inner wall of a tower body, a distribution disc is arranged on the supporting part, through the supporting part, the distribution disc is placed on the center of the tower body, a vertical liquid inlet pipe is arranged on the distribution disc, and is connected with a transverse liquid inlet pipe, multiple evenly-distributed overflow pipes are arranged at the position, on the periphery of the vertical liquid inlet pipe, of the distribution disc, the tops of the overflow pipes are lower than the height of the outer edges of the distribution disc, and the overflow pipes are spraying channels with liquid sprayed to padding. Liquid is evenly distributed, and is relatively concentrated to thecenter of a tower, liquid is prevented from flowing along the tower wall, that is the side flowing phenomenon, and the treatment capacity of the device is improved.

The invention provides a star lander storage box propellant management device and a manufacturing method thereof. The star lander storage box propellant management device comprises a supporting cover, a base, a damping management area, an internal net management layer and an external net management layer. The internal net management layer and the external net management layer are welded to the base. The internal net management layer is embedded in and sleeved with the external net management layer. Gas-liquid mixed propellant of the damping management area is drained to the external net management layer, becomes single-phase liquid propellant after being subjected to gas-liquid separation through the external net management layer, and enters an external net management area formed by the external net management layer. The single-phase liquid propellant flows to an internal net management area formed by the internal net management layer through the internal net management layer and is then discharged out of a storage box. Before the external net management layer loses efficacy, the internal net management layer is completely soaked in the propellant, and therefore the constant flowing area of the internal net management layer and low flow resistance generated when liquid passes through a net under large flow are ensured. The internal net management area is completely in the liquid-full state in the drainage process before the internal net management layer loses efficacy, and therefore it is prevented that gas is sucked into a liquid path outlet due to rotational flow when large-flow discharge is conducted, and it is ensured that the air-assistance-free propellant is reliably supplied to an engine.

The invention discloses a soft package lithium battery which comprises a battery box and a modular soft package battery pack. The modular soft package battery pack is welded in the battery box; the outer wall of the modular soft package battery pack and the inner wall, welded with the modular soft package battery pack, of the battery box are made of weldable materials. The soft package lithium battery is small in size and convenient to install, and the soft package battery pack is firm in connection and good in heat dissipation after installation is completed.

The invention discloses an air inlet recycling pipe component with annular pipeline cavities. The air inlet recycling pipe component comprises a main pipeline; a first annular pipeline and a second annular pipeline sleeve the outer side of the main pipeline; a first annular pipeline cavity and a second annular pipeline cavity are formed between the first annular pipeline and the main pipeline as well as between the second annular pipeline and the main pipeline; the first annular pipeline is connected with the second annular pipeline through an annular plate; ventilation holes are uniformly formed in the circle of periphery of the annular plate; an annular notch which is communicated with the second annular pipeline cavity is also formed in the side wall of the main pipeline; a recycling air inlet pipe is vertically arranged on the outer side of the first annular pipeline; and the recycling air inlet pipe is communicated with the first annular pipeline cavity. According to the air inlet recycling pipe component, a decompression structure formed by the parallel two-stage annular pipeline cavities is adopted, so that the structure is compact, and airflow loss is reduced while the pressure is reduced; and the phenomenon that after recycling air flows into the main pipeline, the pressure of the recycling air causes adverse influence on the working efficiency of a supercharger compressor impeller and causes turbulent flow influence on the air in the main pipeline is avoided.

The invention relates to a centering anti-eccentric anti-waxing sucker-rod coupling and belongs to the field of petroleum and gas development. According to a sliding and rolling combined friction way, a magnet anti-waxing body (8) is arranged below friction balls (10); a sucker-rod standard body (4) is designed according to a fluid mechanics principle and is combined with the sucker-rod coupling; with a water facing line (5), a water facing surface (6) and an overflow surface (7), the overflow area of a well liquid flow passage (3) is guaranteed and the liquid flow resistance is reduced, so that the sucker-rod standard body (4) becomes a standard part of the sucker-rod coupling; the resistance to well liquid by the sucker-rod standard body (4) is minimized; the rolling of the friction balls (10) plays a main role while sling friction surfaces (9) play a secondary role; the magnet is free of influence of wax, and the sucker-rod standard body (4) is designed according to the shape of a submarine, so that the resistance to the well liquid is reduced.