1229results about "Jet pumps" patented technology

The invention discloses a porous ejector, a use method thereof and a fuel cell system, and belongs to the technical field of fuel cells. Comprising a shell, a cavity is formed in the shell, and the cavity comprises a suction cavity, a mixing chamber, a second flow stabilizing chamber and a diffusion section which are sequentially arranged; a nozzle body is mounted in the suction cavity and is used for accelerating and depressurizing the driving fluid and spraying the accelerated and depressurized driving fluid into the suction cavity to form a negative pressure area; an ejection opening is formed in the side wall, corresponding to the suction cavity, of the shell and used for introducing an ejection fluid, and the ejection fluid and the driving fluid subjected to acceleration and pressure reduction are mixed in the mixing chamber; a nozzle assembly is arranged at the end, close to the mixing chamber, of the nozzle body and comprises at least one nozzle, and driving fluid is accelerated through a hole channel of the nozzle. The invention provides a porous ejector, a use method thereof and a fuel cell system, and solves the technical problems of low fuel injection efficiency and insufficient energy utilization of a single-hole ejector used in a traditional hydrogen supply system.

The invention relates to an expanding drill device for expanding a pilot bore produced from a starting point to a target point in the ground along a specified drilling line by moving the expanding drill device (10) along the specified drilling line in order to produce a bore in the ground or in rock for introducing a pipeline or a supporting system into the expanded bore, comprising: a housing (11); a drill head (14) that has a cutting wheel (15) which is arranged on the drill side (21) of the expanding drill device (10) so as to be rotatably mounted and driven about a rotational axis and relative to the housing and on which at least one drill tool (16) for loosening the ground or the rock is arranged; and a drill-side connection for producing a connection to a pipe section located in the pilot bore on the drill side, wherein the drill side (21) centrally has at least one receiving chamber (24) for the loosened ground or the loosened rock, said receiving chamber being connected to a material conveyor device of the expanding drill device (10) for the loosened ground or the loosened rock via at least one removal opening (30); the drill side (21) has at least one drill chamber (38) that is equipped with the cutting wheel (15), which is arranged about the receiving chamber (24); the cutting wheel (15) has an annular design and is rotatably arranged about the central receiving chamber (24); and the receiving chamber (24) is connected to the drill chamber (38) via at least one conveyor opening (41) so that the loosened ground or the loosened rock can be conveyed into the receiving chamber (24) through the conveyor opening (41). According to the invention, at least one crusher (46) is provided in the drill chamber (38); the crusher (46) has crusher strips (49) on the rotatable cutting wheel (15) which move together with the cutting wheel (15) and crusher strips (47) on the receiving chamber (24) side facing the drill chamber (38) which are rigidly arranged together with the receiving chamber (24); and the crusher strips (47, 49) are arranged relative to one another such that a crusher gap (50) is produced between the crusher strips.

The invention relates to the technical field of heat dissipation devices, in particular to a multistage drainage fan which comprises a fan body and a drainage device, the drainage device comprises a drainage cavity defined by a top wall, a bottom wall and side walls connected between the top wall and the bottom wall, and second drainage channels in one-to-one correspondence with first drainage channels are distributed in the drainage cavity at intervals. According to the fan, jet flow generated by the jet flow hole of the fan body flows through the gap between the fan body and the drainage device and then enters the corresponding first drainage channel, gas in the peripheral direction of the area, opposite to the jet flow hole, in the gap is entrained, and primary drainage is formed; when the airflow flowing in from the first drainage channel flows through the second drainage channel, the airflow drags the air in the second drainage hole, so that at least one secondary drainage is generated, the airflow finally sprayed out from the side wall flow outlet is substantially increased, and the heat dissipation efficiency is improved.

The invention relates to the technical field of piezoelectric fans, in particular to a jet flow type miniature heat dissipation device which comprises an air inlet assembly and an air outlet assembly. The air inlet assembly comprises an air inlet plate, the air inlet plate is provided with fan blades and a vibration part attached to the fan blades and used for driving the fan blades to vibrate, and when the fan blades vibrate, external airflow is introduced and blown out in the direction away from the air inlet plate. The air outlet assembly comprises an air outlet layer attached to the air outlet side of the air inlet assembly and an air outlet plate attached to the air outlet layer. Wherein the air outlet layer is provided with a plurality of jet flow holes which are formed in the thickness direction in a penetrating mode, the air outlet plate is provided with air outlet channels corresponding to the jet flow holes, and the diameter d of the jet flow holes and the distance s between the jet flow holes meet the requirement that s / d is smaller than or equal to 5, so that airflow output from the jet flow holes is fused into a vortex ring in the air outlet channels and then discharged. The jet flow holes form a vortex ring structure and then are exhausted, the flow speed of gas is increased, the contact area of the gas and the gas outlet channel is increased, and the air outlet amount and the heat dissipation efficiency are improved.

The disclosure describes an expanding drill device for expanding a pilot bore by moving the expanding drill device along a specified drilling line comprising: a housing; a drill head that has a cutting wheel which is arranged on the drill side of the expanding drill device so as to be rotatably mounted and driven about a rotational axis and relative to the housing and on which at least one drill tool for loosening the ground or the rock is arranged; and a drill-side connection for producing a connection to a pipe section located in the pilot bore on the drill side, wherein the drill side centrally has at least one receiving chamber for the loosened ground or the loosened rock, said receiving chamber being connected to a material conveyor device of the expanding drill device.

A bleed system including a jet pump system configured to provide a supply gas comprising at least one of a higher pressure gas, a lower pressure gas, or a mixture of the higher pressure gas and the lower pressure gas. A needle body defines a throat region between a nozzle wall and the needle body. The needle body is configured to cause a gap between a rear needle surface of the needle body and the nozzle wall to decrease as the rear needle surface extends toward the throat region. The jet pump system is configured to discharge the higher pressure gas through the throat region and mix the higher pressure gas and the lower pressure gas in a mixing portion of an exhaust portion.

The invention discloses a compact type full-power coverage ejector structure, and relates to the technical field of ejector structures, the compact type full-power coverage ejector structure comprises a flow mixing cavity and a conveying cavity which are arranged in a communicating mode, and a nozzle used for conveying high-speed fluid is arranged at the end, away from the conveying cavity, of the flow mixing cavity; a secondary hydrogen flow inlet for conveying low-speed fluid is formed in the side wall of the mixed flow cavity; the nozzle comprises a conical section and a cylindrical section, wherein the conical section is close to the conveying cavity. According to the compact full-power coverage ejector structure, the nozzle, the partition plate, the needle valve and other structures are arranged, the opening degree of the nozzle is adjusted in real time through the pressure of high-speed fluid, accurate flow control within the full-power range is achieved, different load requirements of a fuel cell are met, and the flow rate is adjusted through the wide-range adjusting capacity of the nozzle. Full-power coverage from low load to full load is achieved, the problem that the efficiency of a traditional ejector is reduced when the load is low is solved, and the use efficiency of the compact full-power coverage ejector structure is improved.

The embodiment of the invention discloses an ultrahigh compression ratio adjustable ejector and a variable working condition performance optimization design method thereof. The adjustable ejector comprises a nozzle, an adjusting cone, a suction chamber, a mixing chamber and a diffusion chamber, wherein working fluid is introduced into the nozzle, the adjusting cone is arranged at the throat part of the nozzle, and the fluid to be ejected is introduced into the suction chamber; the adjusting cone is formed by alternately and repeatedly connecting cylindrical surface sections and conical surface sections, and the adjusting cone can axially move; the method comprises the steps that the pressure of working fluid input into the adjustable ejector is monitored; when the pressure of the working fluid is changed between the first pressure and the second pressure, the adjusting cone is axially moved, and each cylindrical surface section directly faces the throat part in sequence, so that step type adjustment of the pressure of the working fluid is realized; when the pressure of the working fluid is changed between the second pressure and the fourth pressure, the adjusting cone is axially moved, and each conical surface section directly faces the throat part in sequence, so that the continuous adjustment of the pressure of the working fluid is realized; the mass flow of the ejected fluid in the adjustable ejector belongs to a preset range; the first pressure, the second pressure, the third pressure and the fourth pressure are gradually increased in sequence.

The invention relates to the technical field of server cooling, in particular to a server pneumatic vacuum circulation cooling device and a working method.The cold air injection conduction unit is provided with a cold air pipeline, a compressed air source is arranged at the head end of the cold air pipeline, and the tail end of the cold air pipeline is connected with a plurality of cold air injection heads which are located in a flow guide cover at the tail end of the cold air pipeline; the heating elements face the corresponding heating elements; compressed air within a set temperature range is transmitted into the cold air injection head through the cold air pipeline and used for injecting air for heat dissipation to the surface of the heating element, and the heating element is located in the secondary side space; the head end of the hot air pipeline faces the primary side space, the tail end of the hot air pipeline is connected with a hot air absorption head, and the hot air absorption head faces the heating element; and the hot gas absorbing head absorbs mixed gas overflowing from the hot gas radiating port by utilizing vacuum and discharges the mixed gas into the primary side space. The low-pressure state after heat dissipation is adapted through vacuum, and the requirements of the secondary side of the server for pressure balance, heat isolation and airflow directionality are met at the same time.

The invention relates to the technical field of tunnel equipment, and discloses a tunnel jet fan control method and system based on traffic flow and pollutant concentration, and the system comprises a data collection module, a data processing module, a control decision module, a jet fan control module and a jet fan frequency conversion controller which are in communication connection in sequence; the data acquisition module is used for acquiring traffic flow and pollutant concentration data; the data processing module is used for processing the traffic flow and pollutant concentration data to obtain processed data; the control decision module is used for generating a control instruction of the jet fan according to the processed data; the jet fan control module is used for converting the control instruction into a corresponding frequency control signal; and the jet fan frequency conversion controller is used for changing the power supply frequency of the jet fan motor according to the received frequency control signal so as to change the jet flow of the jet fan. According to the invention, the air quality in the tunnel can reach the standard, and the energy consumption can be effectively reduced.

The invention relates to the technical field of oil and gas field and coal bed gas field mining equipment, in particular to a wellhead suspension centrifugal pump drive double-pipe jet flow drainage and mining device and a using method. According to the technical scheme, a lower tubing head four-way joint, a middle tubing head four-way joint and an upper tubing head four-way joint are sequentially installed on a bottom flange, a motor is installed on the upper portion of the upper tubing head four-way joint, and an inner pipe plug-in pump core catcher is installed at the lower end of a submersible water injection centrifugal pump; the lower end of the inner pipe inserted pump core catcher is movably connected with an inner layer oil pipe, and a pump core installed in the double-pipe jet pump is arranged in a pump cylinder of the jet pump. The device has the advantages that due to the fact that a packer is omitted and the device is connected with the double-pipe jet pump, sand-containing liquid in a well can be sucked, and exploitation of natural gas or coal bed gas can be achieved; the inner pipe is inserted into an elastic clamping jaw of the pump core catcher to catch the pump core; and the submersible water injection centrifugal pump and the pump core can be lifted to the ground at one time by hoisting the motor at a ground wellhead, so that the maintenance is convenient.

The invention belongs to the technical field of jet-type hydraulic down-the-hole hammer drilling tools, and relates to an involution type jet-flow element which is formed by involution of a jet-flow element plate A and a jet-flow element plate B. The jet-flow element plate A and the jet-flow element plate B are of a mirror symmetry structure. And an input channel, a left signal channel, a left control channel, an upper cavity emptying channel, a right control channel, a right signal channel, an output channel, a lower cavity emptying channel, a main nozzle, a split wedge fixing screw hole, an involution plate fixing pin hole A and an involution plate fixing pin hole B. According to the invention, the processing difficulty is reduced, the processing period is shortened, the processing cost is reduced, and the production efficiency is improved. According to the flow channel with the small depth-to-width ratio, the stress of a stress concentration area is reduced, the jet element is promoted to adopt a hard alloy with a lower mark and higher erosion resistance, then the erosion resistance of the jet element is improved, the service life of the jet element is prolonged, the small-depth-to-width-ratio oppositely-combined jet element provides possibility for design and machining of the jet element with the ultra-large width-to-depth ratio, and the design cost is reduced. And enough strength redundancy is provided.

According to the bladeless fan, through the arrangement of an air channel straight pipe, an air channel bent pipe, a flow dividing pipe, a left nozzle assembly and a right nozzle assembly, when the bladeless fan works, air flow can be blown out from the left nozzle assembly and the right nozzle assembly on the two sides, and meanwhile the air channel straight pipe can rotate relative to a base; according to the bladeless fan, the flow dividing pipe can rotate by 360 degrees relative to the air duct bent pipe, so that the air blowing range of the left nozzle assembly and the right nozzle assembly can be adjusted, and therefore the rotating angle positions of the left nozzle assembly and the right nozzle assembly can be adjusted according to requirements, the air outlet range of the bladeless fan is effectively enlarged, and the service life of the bladeless fan is prolonged. The use requirements of a user are met; besides, through the arrangement of the noise reduction cover body, it can be ensured that noise generated by the fan motor assembly is blocked and reflected through the noise reduction channel when air enters to form airflow and the noise is spread outwards, the noise reduction and noise reduction effects are achieved, then the noise generated when the bladeless fan works is reduced, and the user experience is improved.

The invention relates to the technical field of heat dissipation devices, in particular to a side-spraying low-noise fan which comprises a fan body and a drainage device, a sinking groove is formed in the side, close to the fan body, of a top wall, a protruding part is formed in the sinking groove in a protruding mode, and high-speed airflow is sprayed out through jet flow holes, penetrates through a gap and then is sprayed into the drainage device through a first drainage channel; the flow of gas sprayed out of the flow outlet can be increased through high inertia, the heat dissipation efficiency is improved, high-speed gas flow can entrain gas in the peripheral direction of the area, opposite to the protruding part, of the jet flow hole in the gap, the sinking groove is formed in the peripheral direction of the protruding part, the through-flow area of a gas circulation channel adjacent to the peripheral direction of the area, opposite to the protruding part, of the jet flow hole is increased, and the flow resistance is reduced. And the peripheral gas can be rapidly and timely entrained and rapidly mixed with the high-speed gas jet flow to reduce the maximum speed of the jet flow center and reduce the speed distribution difference between the center and the edge of the gas flow, so that the purpose of suppressing noise is achieved.

The invention relates to the technical field of oil and gas field and coal bed gas field drainage and mining, in particular to a buoyancy lift pump core ring jet flow pump and a using method. According to the technical scheme, a low-density buoyancy lift pump core is installed in an inner cavity of a pump cylinder, an annular gap is formed between the low-density buoyancy lift pump core and the inner wall of the pump cylinder, a formation liquid suction inlet is formed in the lower side of the annular gap, an annular throat pipe is arranged below the formation liquid suction inlet, a diffusion cavity is formed below the annular throat pipe, and a pump core supporting seat is arranged at the bottom of the diffusion cavity; a mixed liquid outlet is formed in the lower side of the diffusion cavity, and the diffusion cavity is communicated with the mixed liquid discharge cavity. The low-density buoyancy lift pump core has the advantages that due to the fact that the overall density of the low-density buoyancy lift pump core is adjusted and reduced, the power hydraulic pressure and the using amount for pulling out the low-density buoyancy lift pump core can be reduced, and operation cost is reduced; in addition, the low-density buoyancy lift pump core is simple in structure, an annular jet flow structure is formed between the low-density buoyancy lift pump core and the pump cylinder, the liquid drainage and production amount is increased, the working condition of the low-density buoyancy lift pump core suitable for pumping media is wider, and the manufacturing cost is lower.

The present application discloses a full-operating-condition ejector, which relates to the technical field of ejectors, and includes a plurality of sub-ejectors arranged in parallel; the sub-ejector includes a nozzle front end tube, a nozzle inlet is provided on the nozzle front end tube, the nozzle inlet on the nozzle front end tube is connected to a high-pressure inlet, a low-pressure chamber is provided at one end of the nozzle front end tube, and a low-pressure inlet is provided on the low-pressure chamber; the nozzle is located in the low-pressure chamber, a mixing chamber connected to the low-pressure chamber is provided at one end of the nozzle, and a medium-pressure outlet is provided at one end of the mixing chamber; the regulating core is located in the mixing chamber, and the end of the regulating core close to the nozzle is conical; the other end of the nozzle front end tube is closed, and an actuator is provided at this end, and the actuator drives the regulating core to move axially through a valve stem, and the valve stem is connected to the regulating core. In this way, the problem of the decrease of the ejection ratio under the variable operating conditions of the traditional adjustable ejector is solved, and the area ratio is converted into a controllable favorable factor to achieve the regulation of the flow load under the full operating conditions.

The present invention provides a device for quickly eliminating instantaneous smoke and dust in underground blasting operation space of coal mines and a method for using the device. The device includes underground compressed air pipeline, negative pressure ejection device, multi-stage negative pressure dust suction device and high pressure wet spray device. First, high pressure gas enters the negative pressure ejection device, and a high negative pressure environment is formed in the negative pressure ejection chamber; the negative pressure power is used to roll up the smoke and dust through the multi-stage negative pressure dust suction device, and separation is implemented; the smoke after dust removal is mixed with high pressure gas and enters the high pressure wet spray device, and the toxic and harmful smoke is absorbed by the organic active agent, and the wet gas formed by the combination of clean gas and organic active agent is sprayed into the underground blasting operation space to implement further dust removal. The device in the present invention is small in size, easy to move, simple to operate, can realize industrialized production, and has strong on-site practicality; the present invention has the multi-stage linkage smoke and dust elimination functions of negative pressure absorbing dust, organic active agent dissolving smoke and high pressure humidification and dust reduction, high efficiency, good effect, and low cost and fast speed effective treatment.

A bleed system including a jet pump system configured to provide a supply gas comprising at least one of a higher pressure gas, a lower pressure gas, or a mixture of the higher pressure gas and the lower pressure gas. A needle body defines a throat region between a nozzle wall and the needle body. The needle body is configured to cause a gap between a rear needle surface of the needle body and the nozzle wall to decrease as the rear needle surface extends toward the throat region. The jet pump system is configured to discharge the higher pressure gas through the throat region and mix the higher pressure gas and the lower pressure gas in a mixing portion of an exhaust portion.

The invention belongs to the technical field of cells, and relates to a hydrogen ejector for a fuel cell, which comprises a mixing chamber, a buffer chamber, a jet flow gas inlet, a liquid discharge hole, an ejection chamber and a plurality of jet flow holes, one end of the first nozzle is located outside the buffer chamber, the other end of the first nozzle penetrates through the side wall of the buffer chamber and then is located in the injection chamber, the part, located in the injection chamber, of the first nozzle is of a gradually-shrunk tubular structure, and a plurality of first arc-shaped rotational flow grooves are evenly formed in the position, close to the gradually-shrunk tubular structure, of the side face of the first nozzle in the circumferential direction of the first nozzle; each first arc-shaped rotational flow groove is formed in the length direction of the first nozzle, and the positions of the multiple first arc-shaped rotational flow grooves correspond to the positions of the multiple jet flow holes in a one-to-one mode. According to the invention, unreacted hydrogen entering the injection chamber can form rotational flow, so that water vapor is separated under the action of centrifugal force, the content of the water vapor in the unreacted hydrogen is reduced, the water logging phenomenon caused by the fact that excessive water vapor increases the resistance of the hydrogen entering an electrode is avoided, and the performance of the fuel cell is improved.

A Venturi device with a primary flow path and a secondary flow path introduced into the primary flow path, wherein a flow of one or more flowable mediums in the primary flow path and the secondary flow path creates a vortex generating a suction at an inlet of the Venturi device. A particulate burner system can be used to combust fuel emission byproducts by injecting fuel and air into a housing having a bottom plate with a round bottom opening for burners to inject fuel into a combustion chamber and a top plate with a round top opening for exhausting fuel emissions. A thruster system can be used to propel munition for deep earth penetration by using a thruster system having a transfer cone connected to a munition body.

The invention discloses a multi-nozzle ejector of a self-adaptive hydrogen fuel cell system. The multi-nozzle ejector comprises an ejector main body, a flow control valve, a flow sensor and a main controller, a working flow channel of the ejector main body comprises a plurality of sub-channels, and each sub-channel is controlled by a flow control valve and is provided with a nozzle; the cross section, perpendicular to the axial direction, of the nozzle is of a multi-star-shaped structure formed by connecting a plurality of V shapes; the flow sensor is used for detecting the flow of workflow, and the main controller is used for receiving detection signals of the flow sensor and driving the flow control valves to control the flow of the corresponding nozzles so as to be matched with the output power change of the fuel cell system. The invention further discloses a self-adaption method of the system. The multi-nozzle ejector disclosed by the invention has relatively strong compatibility to complex and changeable working conditions of the fuel cell, the mixing performance and the stability and the reliability of the fuel cell are improved, and the working range of the ejector is widened.

The invention relates to a jet pump (2) for supplying hydrogen in a fuel cell system, comprising a nozzle device (10) and a needle (30) adjustably guided in a bearing bore (13) of the nozzle device (10) for changing an outlet cross-section relative to the nozzle device (10). To ensure long-term, reliable operation of the jet pump (2), the nozzle device (10) has a recess (24) extending along the needle (30) on the bearing bore (13) and / or a recess (25) extending along the needle (30) next to the bearing bore (13). The invention further relates to a bearing for the needle (11) for a jet pump (2).

The invention provides a portable bladeless fan which is characterized in that a first air inlet part is arranged on the rear side, a first air outlet part is arranged on the front side, and the first air inlet part and the first air outlet part are communicated in a shell; the pressurizing piece is connected with the front side of the shell, the pressurizing piece is provided with a negative pressure channel, and the negative pressure channel guides air on the radial outer side of the shell to the radial inner side of the shell; the mixed flow fan is located in the shell and connected to the rear side of the pressurizing piece, and the mixed flow fan rotates around a rotating shaft to generate airflow; a pressurizing flow guide channel is formed between the mixed flow fan and the shell and between the pressurizing piece and the shell, air enters the pressurizing flow guide channel from the first air inlet part, pressurized mixed flow is formed in the pressurizing flow guide channel and then is exhausted from the first air outlet part, and meanwhile air on the radial outer side of the shell is driven to flow through the negative pressure channel and is guided out from the radial inner side of the shell. On the basis that it is ensured that the first air outlet part exhausts air with enough air volume and air pressure, the air volume and the air supply distance are further increased through air guiding of the negative pressure channel.

The invention discloses a gas ejector and turbine vacuum pump combined type vacuumizing system and method, and relates to the field of vacuum equipment, and the gas ejector and turbine vacuum pump combined type vacuumizing system comprises an incoming flow device used for providing ejected gas for an ejector system; the ejector system is used for sucking gas from the incoming flow device, carrying out primary pressurization treatment on the sucked gas, and transmitting the gas subjected to the primary pressurization treatment to the buffer cavity system; the buffer cavity system is used for rectifying and stabilizing air flow from the ejector system and the atmospheric environment or a first preset air source, weakening mechanical vibration transmitted to the turbine vacuum pump system by the ejector system, and providing starting flow, anti-surge protection and uniform and stable air inlet conditions for the turbine vacuum pump system; the turbine vacuum pump system is used for secondarily pressurizing the gas from the buffer cavity system and discharging the gas into the atmospheric environment; the invention provides a gas ejector and turbine vacuum pump combined type vacuum-pumping system which is high in performance and stability and suitable for high vacuum and intermittent incoming flow working conditions.

The invention relates to a jet pump for hydrogen recirculation for a fuel cell stack, with a nozzle needle (2) which on the one hand engages slidably in a nozzle opening (4) and on the other hand is slidably mounted in a housing (1) between two end stops (6, 7) along its longitudinal axis (8), characterized in that in the housing (1) in the area of ​​the end stops (6, 7) a pneumatic damping chamber (23, 24) is formed and on the nozzle needle (2) an associated damping piston (25, 26) is formed, such that by immersing the respective damping piston (25, 26) in the respective damping chamber (23, 24) a stop-damping pneumatic pressure cushion can be generated.

Various examples are provided related to airlift pumping of downhole geothermal fluids. In one example, an airlift system includes a compressor; a gas sparger head in a wellbore of a geothermal well, and a pressure head recycle assembly. The sparger head produces artificial lift of the geothermal fluids by injecting a gas resulting in a difference in density downhole. The entrained gas can be extracted by the pressure head recycle assembly, compressed, and reinjected downhole. The geothermal fluid at the well head can be used in direct use applications or in a thermodynamic cycle to make shaft power. The gas sparger head can include a venturi shaped passage extending through the gas sparger head and a bubble orifice including gas orifices radially spaced about a narrow portion of the venturi shaped passage. The gas orifices can have a corresponding resonant chamber through which the gas (e.g., air) is provided.

The invention relates to the technical field of oil and gas field and coal bed gas field mining and drainage engineering, in particular to a multi-stage high-speed centrifugal pump driven underground sand blockage prevention jet flow drainage and drainage system and a using method. According to the technical scheme, the output end of a horizontal centrifugal pump is connected to a well mouth through a pipeline, the sand blocking prevention tubular jet pump is installed on an underground oil production layer through an oil pipe, a plurality of sand setting bearing umbrellas are installed on the small-diameter oil pipe in a segmented mode, and a plurality of sand setting bearing covers are installed on the oil pipe in a segmented mode. The problems that a pump shaft of a multi-stage high-speed centrifugal pump is large in length and high in rotating speed and is in axial fluctuation in the starting and working process of the pump, consequently, a common coupling force transmission and dynamic sealing structure is difficult to adapt to the high-rotating-speed working condition, and the fault rate is high are solved. In addition, the sand blockage prevention tubular jet pump is improved, the sand blockage prevention performance of the sand blockage prevention tubular jet pump is enhanced, the sand blockage prevention tubular jet pump is novel and simple in structure, safe and reliable, a plurality of sand setting bearing umbrellas are installed on a small-diameter oil pipe in a segmented mode, and sand blockage of an underground pump and a tubular column caused by the fact that setting sand sinks into a pump cylinder is avoided.

The invention relates to an underground multi-mode overflow monitoring system and method, and belongs to the technical field of well drilling monitoring, the system is arranged in an axial through hole of a drill collar body, and the system comprises a central fluid channel assembly comprising a Venturi tube section communicated with the through hole; the annular sensor array assembly comprises a barrel which is arranged on the outer side of the Venturi tube section in a sleeving mode and attached to the inner wall of the drill collar body, an annular flow channel is formed in the position, corresponding to a high-pressure area of the Venturi tube section, in the barrel, one end of the annular flow channel is closed, and the other end of the annular flow channel is a Venturi drainage ejector communicated to the high-pressure area of the Venturi tube section; the annular flow channel is provided with a plurality of drainage channels, and the annular flow channel is provided with a multi-mode sensor along the circumferential inner wall of the annular flow channel; a plurality of sampling holes communicated with the drainage channel are formed in the drill collar body; the system further comprises a processor, all the sensors are connected with the processor, and the processor communicates with the measurement-while-drilling system. The method and the device have the effect of improving the stability of monitoring work in a complex drilling environment.

The present invention relates to the technical field of ejectors, and specifically discloses an ejector with a wide flow ratio that is easy to adjust, which is used to solve the problem of single adjustment in the prior art; the ejector comprises a first pipe body and a second pipe body, the exhaust end of the second pipe body is provided with an exhaust pipe section, and a contracting conical section is between the exhaust pipe section and the second pipe body. The other end of the exhaust pipe section is connected to the expansion pipe section, and the second pipe body is connected to the first pipe body by a connecting piece. The outside of the first pipe body is connected to a high-pressure air intake pipe, and the outside of the second pipe body is connected to a low-pressure air intake pipe. The present invention is adjusted according to existing needs, and the equipment can be disassembled and assembled to facilitate later maintenance. The ventilation cross-section of the air intake position can also be adjusted, and the low-pressure air intake position can also be adjusted. The two do not interfere with each other, thereby meeting the use of different positions.