15results about How to "Improve negative pressure effect" patented technology

The invention discloses intelligent low-clearance cast-in-place pile construction equipment, system and method. The construction site scanning and model building, paying-off and point position projection and correction, automatic construction path planning, drilling positioning, preparation work before drilling (burying of a soil layer structure integrity evaluation sensor), drilling construction and accurate control of perpendicularity and drilling depth, drilling lifting and in-hole environment detection are sequentially completed. And therefore, the intelligent construction operation of the cast-in-place pile is completed, the equipment has the construction characteristics of miniaturization and large drilling depth, and the intelligent construction operation under the low clearance working condition is perfectly achieved.

A user drives a plugging piece to open a water outlet through a driving piece, a water inlet buoy descends to a first preset height along with the height of the liquid level, water starts to flow out of a first water outlet and a second water outlet, water in the second water outlet flows through a foaming channel, and therefore foaming liquid and air are sequentially sucked into the water flow to form foam; and meanwhile, the plugging piece descends along with the liquid level to close the water outlet, the first water outlet supplements water in the water storage box until the water inlet buoy ascends to the second preset height along with the liquid level, the foaming water inlet valve is closed, and water discharging and foaming of the first water outlet and the second water outlet are stopped. Therefore, the device adopts a purely mechanical control foaming mode, a peristaltic pump and a power supply module thereof are not used, the production cost and the use noise are reduced, and the user experience is improved. Meanwhile, the foaming time can be changed by adjusting one or more of the flow of the first water outlet, the drainage flow of the drainage port and the capacity of the water storage box, and the diversified use requirements of users are met.

The invention discloses an automatic sampling device for on-line monitoring of ground powder granularity, and relates to the field of carbon material powder preparation and testing, the automatic sampling device comprises a motor, a sampling tube, a screw rod and a first hoop; one end of the sampling tube is fixedly connected to the motor; the screw rod is located in the sampling tube, and one end of the screw rod is also fixedly connected to the motor; the sampling tube is connected with the motor connecting part; one end, close to the first hoop, of the sampling pipe is fixedly connected; the other end of the through pipe is connected with one end of the Venturi pipe; the other end of the Venturi tube is connected with one end of the three-way tube; the other two ends of the Venturi tube are respectively connected with a compressed air tube and a material tube; the compressed air generates negative pressure through the Venturi tube, so that material sampling is facilitated, the sampling efficiency is improved, and the sampled material is ensured to meet the concentration required by sample testing; the device adopts the motor as a power source, and the sampling tube and the screw are driven to rotate through the motor, so that the sampling accuracy and efficiency are improved.

The invention relates to the technical field of negative pressure cleaning sheds, and discloses a self-circulation dust removal negative pressure cleaning shed which comprises a cleaning shed body, the cleaning shed body is formed by combining a plurality of assembly parts, a plurality of connecting plates and a plurality of movable doors, and the interior of the cleaning shed body is divided into a first cleaning chamber, a second cleaning chamber and a communicating chamber; an air inlet is formed in the top of the cleaning shed body; a sealing mechanism, a filtering mechanism and a disinfecting mechanism; the air outlet pipe is arranged to communicate with the air inlet, air extracted from the interior of the second cleaning chamber passes through the air inlet and then enters the first cleaning chamber, so that the self-circulation dust removal effect is achieved, overflow is effectively prevented, a sealing mechanism is arranged, after a connecting plate is inserted into an assembly part, a sealing plate can be extruded on the side wall of the connecting plate, and the sealing plate is prevented from being blocked. And in the process, the sealing plate can pull the sealing gasket to extend, so that the space between the sealing plate and the assembly part is blocked, the sealing effect between the connecting plate and the assembly part is better, and the negative pressure effect is better.

The utility model discloses a cooling system for a locomotive traction converter, which relates to the technical field of converters, aims to solve the technical problem that the cooling effect of the existing cooling system is poor, and comprises an electric locomotive which is internally and detachably provided with a converter component and is provided with a locomotive head part and a locomotive tail part, the converter assembly comprises a converter assembly which is detachably arranged in the tail part of the electric locomotive, and the converter assembly comprises an alternating current-direct current conversion converter box of which the two sides are equidistantly and detachably provided with a plurality of groups of converter U-shaped cooling pipelines in an inserted manner; protection assemblies covering the U-shaped cooling pipelines of the converters are fixedly installed on the two sides of the alternating-current and direct-current conversion converter box at equal intervals, connecting pipes are constructed and communicated between the U-shaped cooling pipelines of the same converter at equal intervals, and flow channels used for air flow circulation are formed between the connecting pipes. The utility model has the advantage of improving the cooling effect of the converter.

The utility model relates to an aspirator, an aspiration assembly and a thrombectomy system. The aspirator comprises a sleeve, a limiting piece, a piston rod and a piston ring, and the sleeve is provided with an aspiration cavity and an aspiration nozzle; the limiting piece is provided with a limiting part, the limiting piece is connected with the side wall of the sleeve, and at least part of the limiting part penetrates through the side wall of the sleeve to extend into the suction cavity; the piston rod is movably contained in the suction cavity and can move in the axial direction and rotate in the circumferential direction of the sleeve, the piston rod comprises a rod body, a plurality of limiting pieces and a plurality of supporting pieces, and the multiple limiting pieces are arranged on the rod body at intervals in the axial direction of the rod body and used for being matched with the limiting part so as to limit the piston rod; the two ends of each supporting piece abut against the two adjacent limiting pieces respectively. The piston ring is connected with the end, close to the suction nozzle, of the rod body, is connected with the inner side wall of the suction cavity in a sealed mode and can synchronously and axially move along with the rod body so that the suction cavity can be in a negative pressure state or restore to a natural state. The negative pressure suction device is good in negative pressure effect.

The invention discloses a high-temperature-resistant flexible connection structure which is mainly composed of a flange, a front guide cylinder, a rear guide cylinder, a skin, heat preservation cotton, an annular movable steel bar frame and the like. The front guide cylinder has two layers and is divided into an inner cylinder and an outer cylinder; one end of the annular movable steel bar frame is fixed on the rear guide cylinder, and the other end is sleeved outside the inner cylinder of the front guide cylinder and can freely slide along the axial direction of the guide cylinder. And a gap is formed between the front guide cylinder and the rear guide cylinder and is filled with heat-insulating cotton. The skin is made of a multi-layer composite material which comprises a flame-retardant fluorine adhesive tape, a stainless steel wire net, aluminum foil cloth, high-silica refractory fiber cloth, first ceramic fiber cloth, aluminum silicate fiber felt and second ceramic fiber cloth from outside to inside, the first four layers are used for guaranteeing the strength and sealing performance of the skin, and the last three layers are used for insulating heat. The flanges at the two ends of the pipeline flexible connector can relatively move in a certain range in the axial direction and the transverse direction, can resist the high temperature of 600 DEG C, can bear certain pipeline positive pressure or negative pressure, and is suitable for connection of inlet and outlet pipelines of a large high-temperature ventilator.

The invention relates to the technical field of ovens, in particular to an exhaust pipeline of an oven and the oven, and aims to solve the problem that an existing oven is poor in heat dissipation effect. In order to achieve the purpose, the exhaust pipeline of the oven comprises a reducing pipe section, and the sectional area of the reducing pipe section is gradually reduced in the direction from the air inlet end to the exhaust end. On the basis of the fluid mechanics principle, a variable-diameter pipe section is designed in an exhaust pipeline, the sectional area of the variable-diameter pipe section is gradually reduced in the direction from the air inlet end to the exhaust end, a gradually-shrunk channel can be formed through the design, airflow acceleration is promoted, and the negative pressure effect is improved. When the sectional area is reduced, the flow speed is increased, so that the hot air flow in the pipeline can be discharged out of the exhaust pipeline more quickly, and the exhaust efficiency is improved.

The invention relates to the technical field of negative-pressure dust collection tools, and particularly discloses a negative-pressure dust collector which comprises a negative-pressure box, a control box arranged on the negative-pressure box and used for controlling the negative-pressure box, a collection box arranged on one side of the negative-pressure box, a negative-pressure pipe communicated with the collection box and a negative-pressure dust collection assembly arranged on the collection box and communicated with the collection box. The negative pressure pipe is connected with an air extractor; the negative pressure dust collection assembly comprises a flaring pipe, a heating pipe communicating with the flaring pipe and a workpiece induction assembly arranged on the heating pipe. The device solves the problem that dust is difficult to treat in a traditional precision cutting procedure.

The utility model relates to an aspirator, an aspiration assembly and a thrombectomy system. The aspirator comprises a sleeve, a limiting piece, a piston rod and a piston ring, and the sleeve is provided with an aspiration cavity and an aspiration nozzle; the limiting piece is provided with a limiting part, the limiting piece is connected with the side wall of the sleeve, and at least part of the limiting part penetrates through the side wall of the sleeve to extend into the suction cavity; the piston rod is movably contained in the suction cavity and can move in the axial direction and rotate in the circumferential direction of the sleeve, the piston rod comprises a rod body, a limiting piece and a supporting piece, the limiting piece is connected with the rod body and used for being matched with the limiting part to limit the piston rod, the supporting piece is connected with the rod body, and the supporting piece abuts against the side face of the side, away from the suction nozzle, of the limiting piece; the limiting piece is supported; the piston ring is connected with the end, close to the suction nozzle, of the rod body, is connected with the inner side wall of the suction cavity in a sealed mode and can synchronously and axially move along with the rod body so that the suction cavity can be in a negative pressure state or restore to a natural state. The negative pressure suction device is good in negative pressure effect.

The wind wheel structure comprises a cylinder, the flow guide cone, a main blade and a stabilizing ring, the flow guide cone is a thin-shell rotary body with the equal wall thickness, and the thin-shell rotary body is formed by rotating an outer contour line around the axis of the cylinder by a circle, and the outer contour line is formed by sequentially and smoothly connecting a first arc section, a second arc section, a straight line section and a third arc section; the outer contour line is gradually away from the axis of the cylinder from the starting end of the first arc section to the end point of the third arc section; the starting end of the first arc section intersects with the inner wall of the thin-shell rotary body forming the flow guide cone and the surface of the column body; a plurality of main blades are uniformly distributed on the circumference of the large end of the flow guide cone and extend towards the column body; the main blades are longitudinally parallel to the axis of the diversion cone; the first arc section is used for forming a gas inlet area with a flaring, and the second arc section forms a gas compression area for increasing the gas flow rate; the linear section and the third arc section form a gas flow guide area; the stabilizing ring is of an annular structure and is formed on the throwing-out side of the main blade in a sleeving mode, and the stabilizing ring is located at the end close to the column body in the axial direction.

The negative pressure suction device for puncture biopsy comprises a tube body, a hollow puncture needle, a puncture needle core, a piston rod, a rubber piston sleeve, a piston driving rod and a gear component. A partition is arranged in the tube body, the puncture needle is installed on the needle connecting tube, the piston driving rod is inserted in the piston driving rod insertion hole, the piston rod is inserted in the piston rod insertion hole, the rubber piston sleeve is sleeved on the front end of the piston rod, the gear component is rotatably installed on the tube body, the piston rod comprises piston rod teeth, the piston driving rod comprises piston driving rod teeth, a piston rod needle core insertion hole is arranged on the piston rod, a rubber piston sleeve needle core insertion hole is arranged on the rubber piston sleeve, a puncture needle core positioning piece is arranged on the side of the tube body, a puncture needle core positioning hole is arranged on the puncture needle core positioning piece, a puncture needle core positioning plug rod is arranged on the puncture needle core positioning plug rod, a puncture needle core driving head is arranged on the puncture needle core positioning plug rod, and the upper end of the puncture needle core is fixed on the puncture needle core driving head, so that the puncture needle core can be pulled out smoothly and labor-savingly.

The present invention discloses a novel radiator mainboard structure, comprising an outer frame and an inner plate, wherein the inner plate is connected with an outer convex mechanism on all sides, and a plurality of tube body mechanisms are distributed in a matrix on the inner plate, and the front and rear sides of the tube body mechanism are connected with a fourth arc frame located on the inner plate, and the first inclined frame, the second inclined frame and the third arc frame are connected with each other to form an annular groove, and the groove is located between the connection between the outer frame and the inner plate, and the protective plate is clamped in the groove of the radiator mainboard by adding the groove on the side, and the protective plate can be well connected together through the setting of the groove, so as to achieve better sealing effect, and the setting of the first inclined frame, the second inclined frame and the third arc frame has high elasticity, and the protective plate can be installed so that the outer frame can be deformed to a certain extent, so that its flexibility is improved, and its strength is improved, so that the air inlet diameter of the strip pipe opening of the radiator mainboard is increased, and the air outlet diameter is reduced, so that the flow of wind speed is accelerated, and the negative pressure effect is improved.

The invention relates to the technical field of sewage treatment, and discloses a jet device for sewage treatment, the jet device comprises a jet device body, a water inlet pipe, a water outlet and an air inlet pipe, a suction chamber is arranged at the left end in the jet device body, and the right end of the suction chamber is connected with a throat pipe; the water outlet is connected to the right end of the throat pipe in a flaring mode, a water outlet flange plate is fixedly arranged at the outer end of the water outlet, and the air inlet pipe is fixedly arranged at the upper end of the side of the jet device body. The water inlet pipe is installed at the left end of the jet device body, a necking-down nozzle is arranged at the right end of the water inlet pipe and stretches into the position, opposite to the throat pipe, inside the suction chamber, and a liquid inlet flange plate is fixedly arranged at the outer end of the water inlet pipe. According to the jet device, sewage and gas are efficiently mixed in the jet device, the mixed sewage can be sprayed out at high pressure through the throat pipe and the flared water outlet, and higher treatment efficiency and effluent quality are shown in the sewage treatment process.

The one-handed needle core extraction and negative pressure suction device for puncture biopsy comprises a tube body, a hollow puncture needle, a flexible puncture needle core, a piston rod, a rubber piston sleeve, a piston driving rod and a gear component. The partition divides the space in the tube body into a piston rod insertion hole and a piston driving rod insertion hole. The puncture needle is installed on the needle connecting tube. The piston rod comprises piston rod teeth, the piston driving rod comprises piston driving rod teeth, the piston rod is provided with a piston rod needle core insertion hole, the rubber piston sleeve is provided with a rubber piston sleeve needle core insertion hole, the tube body is provided with a tube body needle core insertion hole and a tube body needle core threaded hole, the tube body needle core threaded hole is provided with a tube body needle core fixing screw, and the piston rod is provided with a needle core guide wheel device, so that the puncture needle can be lifted and inserted and the puncture needle core can be extracted while performing negative pressure suction.