Novel multistage centrifugal pump

The invention relates to a novel multistage centrifugal pump. A pump shaft is provided with a group of impellers and guide vanes. Runners among the impellers are communicated in the middle. A last stage impeller is connected with a water spray section. The rear side of the last stage impeller is provided with a post axial force balancing device. The post axial force balancing device consists of a balancing drum arranged on the pump shaft, a balancing drum sleeve sleeved outside the balancing drum and a balancing chamber, wherein a gap is reserved between the balancing drum and the balancing drum sleeve; and the surface of the balancing drum is provided with a plurality of axial grooves. The invention has the advantages that: (1) the leakage from the radial gap between the balancing drum and the balancing drum sleeve is small, so difference between front and rear pressures of the balancing drum is increased so large as to make the balancing of the axial force by the balancing drum convenient ...

Centrifugal pump flow prediction method based on power and differential pressure

Disclosed is a centrifugal pump flow prediction method based on measurement of power and differential pressure. The centrifugal pump flow prediction method is characterized by including steps that 1, a whole centrifugal pump is respectively divided into a motor module, a mechanical model and a hydraulic power module on the basis of a 'gray box' construction theory; 2, a whole flow prediction mathematical model of the centrifugal pump is built on the basis of system analysis; 3, local establishment of a motor output power prediction mathematical model is performed on the basis of a motor inner loss model; 4, local establishment of a mechanical transmission part output power (or centrifugal pump input power) prediction mathematical model is performed on the basis of a mechanical loss model; 5, local establishment of a model among centrifugal pump input power, flow and rotating speed and a model among centrifugal pump differential pressure, flow and rotating speed is performed on the basis ...

Ship propeller entanglement cutting device

The invention discloses a ship propeller entanglement cutting device. The ship propeller entanglement cutting device comprises a device body; a cutter system, a propelling system, an image information collecting system, a lighting system, a control system and an electrical system are installed on the device body; the cutter system comprises a sand wheel cutter mechanism and a multi-gear shear mechanism; the propelling system comprises a propeller and a hollow float block; the lighting system and the image information collecting system are arranged at the front end of the device body, and the image information collecting system is located at the upper part of the cutter system; the control system is located in a sealed space at the inner part of a device body bracket, a signal input end of the control system is in signal connection with a signal output end of the image information collecting system, and corresponding port of the signal output end of the control system is respectively in ...

Balanced centrifugal pump shaft in area is to centrifugal pump of power mechanism

The utility model provides a balanced centrifugal pump shaft in area is to centrifugal pump of power mechanism, includes the pump body and installs the impeller subassembly at pump body inner chamberthat the impeller subassembly is installed on stretching into the inside pump shaft of the pump body, the impeller subassembly impeller subassembly installation cavity clearance fit inside with the pump body, the impeller subassembly includes impeller, front shroud of impeller and rear cover plate of the impeller, and rear cover plate of the impeller's outer terminal surface is equipped with center boss, and the back choma is adorned admittedly to interior its axial of following of mounting hole of the pump body, back choma and the center boss clearance fit who inserts back choma centre bore,and back choma is coaxial with the preceding choma of front shroud of impeller, and the centre bore aperture of back choma is greater than preceding choma external diameter, rear cover plate of the impeller ...

Novel high-efficient energy-saving pump

The invention discloses a novel high-efficient energy-saving pump, comprising a water sucking chamber, an impeller, a pump body, a pump body seal ring and an impeller seal ring, wherein the water sucking chamber is composed of a straight cone-shaped water sucking chamber and a straight tube section of the outlet end of the straight cone-shaped water sucking chamber; the straight tube section is internally provided with an inclined clapboard. The novel high-efficient energy-saving pump of the invention has the beneficial effects that the circumferential circulation exists in the liquid flow atthe outlet of the water sucking chamber, the impact loss of the impeller inlet is reduced, and the pump efficiency is improved; the leakage rate of the gap between a seal ring and a lengthening cut-water is reduced, and the leakage lose is lowered; and the seal ring has good sealing performance and long service life, and is especially suitable for application occasions where conveying medium contains ...

Novel petroleum chemical flow-process pump

The invention relates to a novel petrol-chemical process pump. The pump comprises a pump body, an impeller, a pump shaft, an overhung shaft carrier, a pipe flange, a pump-end coupling, a motor end coupling, a motor and a base, wherein the pump body and a motor are arranged on the base, the impeller and the pump shaft are arranged in the pump body. A front end of the pump body is connected with the pipe flange. A rear end of the pump body is connected with the overhung shaft carrier. The pump shaft is arranged in the overhung shaft carrier. A front end of the pump shaft is connected with the impeller and a rear end of the pump shaft is connected with the pump end coupling. The pump body comprises a pump cover and a main pump body, wherein the front pump cover is positioned in front of the impeller and is connected with the main pump body and an adjusting plate which is connected with the pipe flange. The invention provides a petrol-chemical process pump which can reduce manufacture cost ...

Impeller blade adjustable two -phase flow impeller of pump

The utility model provides an impeller blade adjustable two -phase flow impeller of pump, includes front shroud of impeller, rear cover plate of the impeller and a plurality of impeller blade, front shroud of impeller, rear cover plate of the impeller are disk -like structure and the two parallel arrangement, the impeller film jacket is between front shroud of impeller and rear cover plate of theimpeller, and the upper and lower both ends face of impeller blade closely pastes by the back rigid coupling with the lower terminal surface of front shroud of impeller, rear cover plate of the impeller's up end respectively, the upper surface center of front shroud of impeller is equipped with first round platform, the impeller blade is circular -arc slice part, rear cover plate of the impeller'supper surface center is equipped with the second round platform, and second round platform center is equipped with axial circular through -hole, is equipped with on the pore wall of circular through-hole ...

Vertical type multilevel barrel bag pump

The invention discloses a vertical multi-level barrel pump which is characterized in that a first level absorption section of the barrel pump adopts a dual absorption impeller and a first level pump body matched with the dual absorption impeller and provided with a dual channel and a radial volute shell; the rotating shafts above and under the dual absorption impeller are respectively provided with a preposed inducer and an absorption guide pipe matched with the preposed inducer so as to realize the dual absorption of pumped fluid. Under the condition that the flow is limited, the value r of net positive suction head (NPSH) can be reduced by more than 1.5m, namely the cavitation corrosion performance is remarkably improved, thereby not only reducing the height and volume of the barrel and the manufacturing cost, but also improving the efficiency and the operation reliability of the pump and bringing convenience for the installation and the maintenance of the pump.

Hollow structure valve core for reciprocating pump in-out one-way valve set

The invention relates to a hollow valve core for the check valve group on the inlet and outlet of a reciprocating pump, comprising a guide rod, a sliding plate and a guide wing arranged on the lower part of the guide rod and playing a guiding role. The sliding plate is arranged in the conical cavity on the upper part of a valve seat, the outer margin of the sliding plate cooperates with the conical surface of the conical cavity, the guiding wing cooperates with a cylindrical cavity on the lower part of the valve seat, a sealing member is arranged above the sliding plate and cooperats with the conical cavity of the valve seat for liquid sealing, the sealing member is equipped with a sealing gland bush, the sealing member and the sealing gland bush are socket-jointed on the lower part of the guide rod, the upper part of the guide rod can be slidably socket-jointed in a fixing support, a reset spring is connected between the fixing support and the sealing gland bush, the guide rod is provided ...

Improvement on axial thrust balancing device of vertical multistage barrel pump

The invention discloses an axial thrust balancing device of a vertical multistage barrel pump. The prior design is improved as follows: a return water hole 10 of a balancing return water pipe 9 is provided with an adjusting device 11 for controlling flow area; a mechanical sealing flushing pipeline 12 is connected between outlet pipe frames 1-2 and a mechanical seal 6, and is provided with a valve 13 for adjusting return water quantity; and a guide pipe 14 communicated with a sealing cavity 5 is provided with a pressure gage 15 for monitoring water pressure in the sealing cavity 5. The vertical multistage barrel pump has the characteristics of visual and convenient adjustment of balancing axial thrust, difficult leakage, reliability and effectiveness of the mechanical seal, long service life of a thrust bearing and the like, so the reliability and the service life of the vertical multistage barrel pump are greatly improved, and the operation and maintenance cost is reduced.

Improvement on axial thrust balancing device of vertical multistage barrel pump

The invention discloses an axial thrust balancing device of a vertical multistage barrel pump. The prior design is improved as follows: a return water hole 10 of a balancing return water pipe 9 is provided with an adjusting device 11 for controlling flow area; a mechanical sealing flushing pipeline 12 is connected between outlet pipe frames 1-2 and a mechanical seal 6, and is provided with a valve 13 for adjusting return water quantity; and a guide pipe 14 communicated with a sealing cavity 5 is provided with a pressure gage 15 for monitoring water pressure in the sealing cavity 5. The vertical multistage barrel pump has the characteristics of visual and convenient adjustment of balancing axial thrust, difficult leakage, reliability and effectiveness of the mechanical seal, long service life of a thrust bearing and the like, so the reliability and the service life of the vertical multistage barrel pump are greatly improved, and the operation and maintenance cost is reduced.

Small flow drilling centrifugal pump impeller fabricating process and centrifugal pump impeller thereof

Disclosed is an impeller manufacturing method of a small capacity centrifugal pump. Calculate the area of the impeller flow passage, the size of the impeller outer diameter and the quantity of the impeller blade according to the performance parameter of the centrifugal pump. The invention is characterized in that drill a hole on the semifinished product piece to form flow passages by using the mechanical processing method; the diameter of the flow passage and the quantity of the flow passage are determined by the flow capacity. The invention has the advantages that the mechanical processing method is simple and convenient with low cost; the surface roughness and the precision of the flow passage is high; the insufficiency of small capacity impeller made by welding and casting method is overcame; the invention can ideally meet the technical requirements of the small capacity impeller.

Numerical-value general-solution method for strength identification inverse-problems of heat-conduction line sources

The invention discloses a numerical-value general-solution method for the strength identification inverse-problems of heat-conduction line sources, comprising the following steps of (1), describing the identification inverse-problems of heat-conduction source terms, and establishing a cost function; (2), in the case that the heat-conduction sources of the step (1) are respectively a point source, directly entering a step (3); in the case that the heat-conduction sources of the step (1) are respectively a line source, converting a line-source inverse-problem to a point-source inverse-problem by adopting a conversion algorithm, and then entering the step (3); (3), solving homogeneous solutions and particular solutions, and constructing a numerical-value general-solution; (4) solving linear simultaneous equations, and obtaining the strength parameters of the heat sources. According to the method, the numerical-value general-solution which meets a heat-conduction differential equation and takes ...

Experimental apparatus is measured to non - smooth surface drag reduction of rotation type

The utility model provides an experimental apparatus is measured to non - smooth surface drag reduction of rotation type, including the experiment body, a centrifugal pump with be used for storing the fluidic pond for providing power, the fluid flow entry of experiment body is said with the water outlet pipe of centrifugal pump and is communicate, the fluid flow export of experiment body is passed through the pipeline and is introduced in the pond, the water inlet and the pond pipeline intercommunication of centrifugal pump, the experiment body includes the runner base, a casing for simulating the runner, resistance regulation and control subassembly and controller, resistance regulation and control unit mount is inside the casing, the resistance regulation and control subassembly port corresponding with the controller is connected. The beneficial effects of the utility model are that: the fluid of experiment usefulness can recycle, and is energy -concerving and environment -protective, ...

Centrifugal pump of making an uproar falls in damping with biomimetic structure

Centrifugal pump of making an uproar falls in damping with biomimetic structure, including spiral case, connecting axle, motor and impeller, the motor be fixed in the casing outside, the connecting axle bearing is in the spiral case and in stretching into the spiral case, the impeller include blade, front shroud and back shroud, the blade is adorned in the front on the connecting axle between the back shroud and is lain in the spiral case, the motor passes through connecting axle and impeller coupling, is equipped with first bionical section in spiral case diffuser below, the vertical section contour shape of first bionical section is the circular arc dentate structure of imitative flying bird assistant outline, starting point bionical section first lies in that the cut water begins, the terminal point extends to between the first section and second section of spiral case pumping chamber, the head circular arc department of cut water sets up and has an at least bellied bionical surface ...

Improved multi-stage centrifugal pump

An improved multi-grade centrifugal pump includes a pump axis, a bearing body part, impellers, an inhalation segment and a disgorge segment. The inhalation segment and the disgorge segment are respectively arranged on the left and the right ends of the pump axis. The bearing body part is installed on the middle position of the pump axis. The impellers are provided at least two. The impellers are respectively installed on the left and the right sides of the pump axis. The impellers which are arranged on the left and the right sides are arranged with the center of the bearing body part. The invention provides the improved multi-grade centrifugal pump which has the advantages of good stability, good reliability and lowered cost.

Balanced type external circulation multi phase flow pump rotor

Pump product intelligent diagnosis and control system based on performance curve

The invention discloses a pump product intelligent diagnosis and control system based on a performance curve. The pump product intelligent diagnosis and control system comprises an external characteristic testing system and a data processing and control system. The external characteristic test system comprises a sensor test module and a test data conversion module. And the test data conversion module converts the voltage/current signal output by the sensor test module into an operation parameter value measured by the corresponding sensor, and sends the operation parameter value to the data processing and control system. And the data processing and control system comprises a data processing and display module, a fault diagnosis and alarm module and a PID (Proportion Integration Differentiation) control module. The data processing and display module comprises a data processing module and a display and interaction module. The running state of the pump product can be intelligently monitored ...

Vibration and noise reduction centrifugal pump provided with bionic structures

A vibration and noise reduction centrifugal pump provided with bionic structures comprises a volute, a connecting shaft, a motor and an impeller. The motor is fixed to the exterior of a shell. The connecting shaft is supported on the volute and extends into the volute. The impeller comprises blades, a front cover plate and a rear cover plate. The blades are installed at the position, between the front cover plate and the rear cover plate, of the connecting shaft and are located inside the volute. The motor is in shaft connection with the impeller through the connecting shaft. A first bionic segment is arranged below a volute diffusion segment, and the contour shape of the longitudinal section of the first bionic segment is an arc toothed structure simulating the outer contour of bird wings. A starting point of the first bionic segment is located at the starting part of an isolation tongue, and an ending point of the first bionic segment extends to the position between a first section and ...

Efficient and energy-saving building water supply system

The invention discloses an efficient and energy-saving building water supply system which comprises a pressure supplementing tank body, a flow stabilizing tank body, a pressure stabilizing tank body, a water tank, a pump room unit, a pressure sensor, a flow sensor, a control cabinet, a permanent magnet synchronous motor, a PC end, a compensation tank, a pressure maintaining tank, a water pump and a frequency converter. And the municipal pipe network directly supplies water to low-layer users, so that high-efficiency water supply to the users is realized. Secondary water supply of high-rise users is achieved through the water pump by adopting the full-frequency-conversion constant-pressure technology, the water inlet and outlet ends of the municipal pipe network are connected with the water tank, and the water tank supplies water to the high-rise users through the pump room unit. In the process that a pump room unit supplies water to high-rise users, the flow and lift data of operation of ...

Novel high-efficient energy-saving pump

The invention discloses a novel high-efficient energy-saving pump, comprising a water sucking chamber, an impeller, a pump body, a pump body seal ring and an impeller seal ring, wherein the water sucking chamber is composed of a straight cone-shaped water sucking chamber and a straight tube section of the outlet end of the straight cone-shaped water sucking chamber; the straight tube section is internally provided with an inclined clapboard. The novel high-efficient energy-saving pump of the invention has the beneficial effects that the circumferential circulation exists in the liquid flow at the outlet of the water sucking chamber, the impact loss of the impeller inlet is reduced, and the pump efficiency is improved; the leakage rate of the gap between a seal ring and a lengthening cut-water is reduced, and the leakage lose is lowered; and the seal ring has good sealing performance and long service life, and is especially suitable for application occasions where conveying medium contains ...