CN113202819A - Guide device for shaft extension tubular pump based on adjustable blade number and control method - Google Patents
Guide device for shaft extension tubular pump based on adjustable blade number and control method Download PDFInfo
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- CN113202819A CN113202819A CN202110605262.0A CN202110605262A CN113202819A CN 113202819 A CN113202819 A CN 113202819A CN 202110605262 A CN202110605262 A CN 202110605262A CN 113202819 A CN113202819 A CN 113202819A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
- F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0027—Varying behaviour or the very pump
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Abstract
The invention discloses a flow guide device for a shaft extension tubular pump based on adjustable blade number and a control method, wherein the flow guide device comprises a flow guide main body, an adjusting mechanism, a flow sensor and a first controller; the flow sensor is arranged at the inlet of a front guide vane area of the shaft-extension through-flow pump; the guide main body comprises guide blades and a guide hub, the guide blades comprise fixed blades and movable blades, and the fixed blades and the movable blades have the same shape; the adjusting mechanism is used for adjusting the included angle between the adjacent fixed blade and the movable blade, and the flow sensor and the electrical appliance assembly of the adjusting mechanism are electrically connected with the first controller. The guide device is additionally arranged in the bent pipe section of the water outlet channel of the shaft-extending tubular pump, and the guide blade is axially stretched along the central axis of the guide hub based on the plane involute and is parallel to the central axis of the hub in space, so that the guide blade can effectively guide the water flow in the channel and eliminate the vortex in the channel.
Description
Technical Field
The invention belongs to the technical field of shaft extension tubular pumps, and particularly relates to a flow guide device for a shaft extension tubular pump based on adjustable blade number and a control method.
Background
The total amount of water resources in China is rich, but the distribution of the water resources is unbalanced in time and space, and flood disasters are easily formed in southern cities in spring and summer, so that the pump station has great effects on flood control, flood drainage, agricultural irrigation and the like. In a low-lift pump station, a shaft-extending through-flow pump flow passage is straight, and a motor is arranged outside the flow passage. However, when the shaft-extension tubular pump is operated under the working condition deviating from the rated flow, especially under the working condition of small flow, the flow state in the water outlet flow channel is disordered, the vortex has a prominent influence on the flow state of the flow channel, and the time domain characteristic and the frequency domain characteristic of pressure pulsation in a key area of the pump are poor, which are very unfavorable for the high-efficiency, safe and stable operation of a shaft-extension tubular pump unit, and can cause the damage and fracture of the impeller blade of the shaft-extension tubular pump in serious cases.
For the same type of problems, large water pumps in other forms are usually provided with fixing flat plates in the inlet and outlet flow passages for flow guiding, but the large water pumps have limited functions under different flow working conditions.
Disclosure of Invention
The invention aims to provide a flow guide device for an axial-flow pump based on adjustable blade number and a control method, and aims to solve the technical problems that in the prior art, the flow state in a water outlet flow channel of the axial-flow pump is disordered under the working condition of deviating from the rated flow, the time domain characteristic and the frequency domain characteristic of pressure pulsation in key areas of a water pump unit such as a pump section are poor, the axial-flow pump unit is not beneficial to efficient, safe and stable operation, and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
the flow guide device for the shaft extension tubular pump based on the number of the adjustable blades comprises a flow guide main body, an adjusting mechanism, a flow sensor and a first controller; the flow sensor is arranged at the inlet of a front guide vane area of the shaft-extension through-flow pump;
the guide main body is arranged in a bent pipe section of a water outlet channel of the shaft-extending tubular pump and comprises guide blades and a guide hub, and the guide blades comprise fixed blades and movable blades; the flow guide hub is cylindrical, and the axis of the flow guide hub is superposed with the central line of the bent pipe section of the water outlet runner; one radial end of the fixed blade is fixedly connected with the flow guide hub, and the other radial end of the fixed blade is fixedly connected with the inner wall of the water outlet runner bent pipe; the outer surface of the flow guide hub is movably sleeved with a connecting ring, one radial end of each movable blade is fixedly connected with the connecting ring, the other radial end of each movable blade is a free end, and the fixed blade and the movable blade are the same in shape;
the adjusting mechanism is used for adjusting the included angle between the adjacent fixed blade and the movable blade, and the flow sensor and the electrical appliance assembly of the adjusting mechanism are electrically connected with the first controller.
Aiming at the problem that the vortex flow state of the water outlet channel of the shaft-extension tubular pump and the pressure pulsation characteristic becomes poor under the condition deviating from the rated working condition, the invention adds the flow guide device in the bent pipe section of the water outlet channel of the shaft-extension tubular pump, and the flow guide device can effectively guide the water flow in the channel and eliminate the vortex in the channel. The flow guide blades comprise fixed blades and movable blades, the flow sensor monitors the running flow condition of the shaft-extending through-flow pump in real time and transmits a monitored running flow signal to the first controller, the first controller sends an instruction to the adjusting mechanism according to the running flow signal, the adjusting mechanism receives the instruction and then drives the movable blades to rotate around the flow guide hub, and the movable blades rotate to a preset angle position. The flow state in the flow channel under different flow working conditions is effectively adjusted, the inner vortex of the flow channel is effectively eliminated, and the pressure pulsation characteristics of key areas such as a pump section of the axial-flow pump are improved.
Further optimizing, a plane perpendicular to the axis of the center line of the bent pipe section of the water outlet channel is recorded as an A plane, the section of the guide hub and the A plane is a circular ring, the inner circle of the circular ring is used as a base circle, an involute in the A plane is used as a molded line M1 of a guide vane, the molded line M1 is stretched along the axis of the center line of the bent pipe section of the channel to obtain the side face of the guide vane, the guide vane is obtained by stretching in the radial direction and is parallel to the central axis of the hub in space, and therefore the guide vane can effectively guide water flow in the channel and eliminate vortexes in the channel.
Taking the circle center of the base circle as an origin, establishing a rectangular coordinate system in the plane A, selecting a plurality of key points on the molded line M1, and fitting an equation of the molded line M1 according to the coordinate values of the key points:
the profile M1 corresponds to the outboard curve equation of the guide vane: y is 4 × 10-14x6-9×10-11x5+9×10-8x4-4×10-5x3+0.0115x2-1.8958x-297.33；
The profile M1 corresponds to the inner curve equation of the guide vane: y is 5 × 10-14x6-1×10-10x5+1×10-7x4-6×10-5x3+0.0148x2-2.2407x-271.09。
Further preferably, the adjusting mechanism comprises a transmission assembly and a hydraulic system, and the hydraulic system comprises a hydraulic controller and a piston type hydraulic cylinder; the transmission assembly comprises a U-shaped connecting rod, a first rotating shaft, a first bevel gear, a second rotating shaft, a first connecting rod and a second connecting rod, one end of the U-shaped connecting rod is fixedly connected with the connecting ring, the other end of the U-shaped connecting rod is fixedly connected with the first rotating shaft, the other end of the first rotating shaft is fixedly connected with the first bevel gear, and the axis of the first rotating shaft is superposed with the central line of the flow guide hub; the first bevel gear is meshed with the second bevel gear, and the second bevel gear is fixedly connected with one end of the second rotating shaft; the first rotating shaft and the second rotating shaft are vertical to each other; the other end of the second rotating shaft is fixedly connected with one end of a first connecting rod, the other end of the first connecting rod is hinged with one end of a second connecting rod, and the other end of the second connecting rod is hinged with a piston rod of the piston type hydraulic cylinder;
a shell is arranged in the flow channel, and one end of the shell is fixedly connected with the side wall of the bent pipe; the first rotating shaft, the first bevel gear, the second bevel gear and the second rotating shaft are arranged in the shell; the hydraulic system, the first controller, the first connecting rod and the second connecting rod are arranged outside the flow channel, one end of the second rotating shaft is positioned in the shell, and the other end of the second rotating shaft penetrates through the side wall of the bent pipe and is fixedly connected with the first connecting rod;
the hydraulic controller is electrically connected with the first controller.
The first controller sends an instruction to the hydraulic controller after receiving a shaft extension tubular pump operation flow signal monitored by the flow sensor in real time, the hydraulic controller controls a piston rod of the hydraulic cylinder to stretch and retract, drives the first connecting rod and the second connecting rod to move, and pushes the second rotating shaft and the second bevel gear to rotate, so that the first bevel gear, the first rotating shaft, the U-shaped connecting rod and the movable blade are driven to rotate together, and the purpose of adjusting the number of the guide blades and the positions of the guide blades is achieved. Wherein a piston rod of the hydraulic cylinder, the first connecting rod and the second connecting rod form a connecting rod mechanism. The adjusting mechanism has stable operation, high adjusting precision and small error.
Preferably, the U-shaped connecting rod comprises two axial connecting rod parts and a radial connecting rod part; the axial connecting rod part is positioned on the surface of the flow guide hub and fixedly connected with the connecting ring, and the blade root part of the movable blade is fixedly connected with the axial connecting rod part and the connecting ring; the radial connecting rod part is positioned at the tail end of the flow guide hub and is fixedly connected with the first rotating shaft.
Further optimize, the length ratio of second connecting rod and first connecting rod is 1: (1-1.2).
Further preferably, the guide hub is provided with a groove, and the connecting ring is movably clamped in the groove.
Further optimizing, the fixed blade and the movable blade are 2.
Further preferably, the transmission ratio of the first bevel gear to the second bevel gear is 1: 1.
further optimizing, the thickness of the guide vane is 12mm, the axial length L2 of the guide vane is 1100mm, the axial length of the guide hub is L1, and the ratio of L2 to L1 is 1: (1-1.4);
preferably, the shell is L-shaped, comprises an axial shell and a radial shell, and is cylindrical, and the diameter of the shell is 80 mm; the axial housing length is 280 mm.
The control method based on the flow guide device comprises the following steps:
step one, the flow sensor detects the running flow Q of the shaft-extending through-flow pump in real timeaAnd sending the detection information to the first controller;
step two, after receiving the detection signal of the flow sensor, the first controller compares the detection signal with the rated flow Q of the shaft-extending tubular pump, sends an instruction to the hydraulic controller according to the comparison result, drives the piston rod of the piston type hydraulic cylinder to extend or shorten, drives the connecting ring and the movable blade to rotate around the guide hub through the rotation of the first bevel gear and the second bevel gear, and then enters the guide hubThe rotating angle theta of the movable blade is controlled; the angle theta is an initial position which is the position of the radial connecting rod part when the movable blade is attached to the fixed blade, and an included angle between the connecting rod part and the initial position when the movable blade rotates to a preset position is theta; the angle theta and the actual operation flow Q of the shaft extension tubular pumpaThe relationship is as follows:
| running flow Q of shaft extension through-flow pumpa | Angle theta | Number of guide vanes | Stationary and moving blade states |
| Qa≥1.0Q | 0° | 2 | Bonding |
| 0.8Q≤Qa<1.0Q | 45° | 4 | Separation of |
| 0.6Q≤Qa<0.8Q | 90° | 4 | Separation of |
。
Compared with the prior art, the method has the following beneficial effects:
1. the flow guide device for the axial-flow pump provides a new scheme for the axial-flow pump and other flow guide modes of the axial-flow pump for improving the flow state of the flow channel of the axial-flow pump, the flow state in the water outlet flow channel of the axial-flow pump under different flow working conditions is greatly improved, the vortex elimination effect is obvious, and the pressure pulsation characteristic of key areas such as the axial-flow pump section is greatly improved.
2. The guide vane which can be adjusted in an involute mode in an assembling and disassembling mode is stretched axially along the central axis of the hub of the guide vane on the basis of a plane involute and is parallel to the central axis in space, and the hollow cylindrical hub is additionally arranged on the guide vane, so that the guide vane and the hub of the guide vane can effectively guide water flow in a flow channel and eliminate vortexes in the flow channel.
3. The guide vane comprises a fixed vane and a movable vane, a flow sensor monitors the operation flow condition of the shaft-extending through-flow pump in real time and transmits a monitored operation flow signal to a first controller, the first controller sends an instruction to a hydraulic controller according to the operation flow signal, the hydraulic controller controls a piston rod of a hydraulic cylinder to stretch and retract, a first connecting rod and a second connecting rod are driven to move, a second rotating shaft and a second bevel gear are pushed to rotate, and therefore the first bevel gear, the first rotating shaft, a U-shaped connecting rod and the movable vane are driven to rotate together, and the purpose of adjusting the number of the guide vanes and the position of the vanes is achieved. The flow state in the flow channel under different flow working conditions is effectively adjusted, the inner vortex of the flow channel is effectively eliminated, and the pressure pulsation characteristics of key areas such as a pump section of the axial-flow pump are improved.
Drawings
Fig. 1 is a schematic structural view of a flow guide device for an axial flow pump according to the present invention, the flow guide device being capable of adjusting the number of blades.
Fig. 2 is a schematic structural view of the adjacent fixed blade and the movable blade of the present invention when they are fitted.
Fig. 3 is a schematic structural view of the present invention when adjacent fixed blades and moving blades are separated.
Fig. 4 is a schematic view of the movable guide vane and the connection thereof according to the present invention.
Fig. 5 is a schematic view of the position of the guide vane profile line according to the present invention.
Fig. 6 is a schematic structural diagram of a guide vane and an adjusting mechanism according to the present invention.
Fig. 7 is a schematic structural view of another view angle of the adjusting mechanism of the present invention.
Fig. 8 is a schematic size diagram of the deflector according to the present invention.
Fig. 9 is a schematic size diagram of the first and second links of the present invention.
Detailed Description
The invention is described below with reference to the accompanying drawings, which are intended to cover several modifications and embodiments of the invention.
As shown in fig. 1 to 8, the flow guide device 6 for the shaft extension flow pump based on the adjustable number of blades comprises a flow guide main body, an adjusting mechanism, a flow sensor 7 and a first controller 8; the flow sensor 7 is arranged at the inlet of the front guide vane area 2 of the shaft-extension through-flow pump.
The guide main body is arranged in a bent pipe section 5-1 of a water outlet channel of the shaft-extending tubular pump and comprises guide blades and a guide hub 6-1, and the guide blades comprise fixed blades 6-3 and movable blades 6-2; the flow guide hub 6-1 is cylindrical, and the axis of the flow guide hub 6-1 is superposed with the central line of the bent pipe section of the water outlet flow channel; one radial end of the fixed blade 6-3 is fixedly connected with the flow guide hub, and the other radial end of the fixed blade is fixedly connected with the inner wall of the water outlet runner bent pipe; the outer surface of the flow guide hub 6-1 is movably sleeved with a connecting ring 6-4, one radial end of the movable blade 6-2 is fixedly connected with the connecting ring 6-4, and the other radial end of the movable blade 6-2 is a free end, as shown in fig. 4.
The flow channel is sequentially divided into a water inlet flow channel 1, a water outlet flow channel bent pipe section 5-1 and a water outlet flow channel 5 according to the water flow direction.
In the present embodiment, the fixed blade 6-3 and the movable blade 6-2 are shown to be identical in shape. The fixed blade and the movable blade are 2. Wherein, the fixed blade 6-3 comprises a first fixed blade 6-3-1 and a second fixed blade 6-3-2, and the movable blade comprises a first movable blade 6-2-1 and a second movable blade 6-2-2.
The adjusting mechanism is used for adjusting the included angle between the adjacent fixed blade and the movable blade, and the flow sensor and the electrical appliance assembly of the adjusting mechanism are electrically connected with the first controller.
Aiming at the problem that the vortex flow state of the water outlet channel of the shaft-extension tubular pump and the pressure pulsation characteristic becomes poor under the condition deviating from the rated working condition, the invention adds the flow guide device in the bent pipe section of the water outlet channel of the shaft-extension tubular pump, and the flow guide device can effectively guide the water flow in the channel and eliminate the vortex in the channel. The flow guide blades comprise fixed blades and movable blades, the flow sensor monitors the running flow condition of the shaft-extending through-flow pump in real time and transmits a monitored running flow signal to the first controller, the first controller sends an instruction to the adjusting mechanism according to the running flow signal, the adjusting mechanism receives the instruction and then drives the movable blades to rotate around the flow guide hub, and the movable blades rotate to a preset angle position. The flow state in the flow channel under different flow working conditions is effectively adjusted, the inner vortex of the flow channel is effectively eliminated, and the pressure pulsation characteristics of key areas such as a pump section of the axial-flow pump are improved.
In this embodiment, a plane perpendicular to the axis of the center line of the elbow section of the water outlet channel is taken as an a plane, the cross section of the guide hub and the a plane is a circular ring, the inner circle of the circular ring is taken as a base circle, an involute in the a plane is taken as a molded line M1 of a guide vane, the molded line M1 is stretched along the axis of the center line of the elbow section of the channel to obtain a side surface of the guide vane, and the guide vane is obtained by stretching in the radial direction and is parallel to the central axis of the hub in space, so that the guide vane can effectively guide the water flow in the channel and eliminate the vortex in the channel. With the center of the base circle as the origin, a rectangular coordinate system is established in the plane a, and 20 key points are selected on the profile M1, as shown in tables 1 and 2.
Table 1: coordinate values of 10 key points on the outer side of the guide vane corresponding to the molded line M1
| Key point serial number | Outside keypoint coordinate x value | Outside key point coordinate |
| 1 | 887.90 | 147.08 |
| 2 | 854.08 | 10.70 |
| 3 | 797.06 | -117.69 |
| 4 | 717.17 | -233.22 |
| 5 | 615.78 | -330.36 |
| 6 | 495.60 | -402.87 |
| 7 | 361.42 | -443.76 |
| 8 | 221.32 | -445.23 |
| 9 | 89.56 | -398.65 |
| 10 | -1.40 | -295.00 |
According to the coordinate values of the 10 key points in the table 1, fitting an outside curve equation of the profile M1 corresponding to the guide vane: y is 4 × 10-14x6-9×10-11x5+9×10-8x4-4×10-5x3+0.0115x2-1.8958x-297.33；
Table 2: coordinate values of 10 key points of the profile M1 corresponding to the inner side of the guide vane
| Key point serial number | Coordinate x value of inner key point | Coordinate y value of inner |
| 1 | 11.17 | -294.79 |
| 2 | 106.32 | -394.56 |
| 3 | 239.90 | -435.54 |
| 4 | 379.80 | -428.18 |
| 5 | 512.13 | -381.69 |
| 6 | 629.14 | -304.20 |
| 7 | 726.35 | -202.89 |
| 8 | 801.30 | -84.12 |
| 9 | 852.88 | 46.53 |
| 10 | 880.95 | 184.19 |
According to the coordinate values of the 10 key points in the table 2, fitting an inside curve equation of the profile M1 corresponding to the guide vane: y is 5 × 10-14x6-1×10-10x5+1×10-7x4-6×10-5x3+0.0148x2-2.2407x-271.09。
In the embodiment, as shown in fig. 6 and 7, the adjusting mechanism comprises a transmission assembly and a hydraulic system, wherein the hydraulic system comprises a hydraulic controller 6-10 and a piston type hydraulic cylinder; the transmission assembly comprises a U-shaped connecting rod 6-5, a first rotating shaft, a first bevel gear 6-8, a second bevel gear 6-9, a second rotating shaft, a first connecting rod 6-13 and a second connecting rod 6-12, one end of the U-shaped connecting rod is fixedly connected with the connecting ring, the other end of the U-shaped connecting rod is fixedly connected with the first rotating shaft, the other end of the first rotating shaft is fixedly connected with the first bevel gear, and the axis of the first rotating shaft is superposed with the central line of the flow guide hub; the first bevel gear is meshed with the second bevel gear, and the second bevel gear is fixedly connected with one end of the second rotating shaft; the first rotating shaft and the second rotating shaft are vertical to each other; the other end of the second rotating shaft is fixedly connected with one end of a first connecting rod 6-13, the other end of the first connecting rod is hinged with one end of a second connecting rod 6-12, and the other end of the second connecting rod 6-12 is hinged with a piston rod 6-11 of the piston type hydraulic cylinder.
A shell 6-6 is arranged in the flow channel, and one end of the shell is fixedly connected with the side wall of the bent pipe; the first rotating shaft, the first bevel gear, the second bevel gear and the second rotating shaft are arranged in the shell; the hydraulic system, the first controller, the first connecting rod and the second connecting rod are arranged outside the flow channel, one end of the second rotating shaft is positioned in the shell, and the other end of the second rotating shaft penetrates through the side wall of the bent pipe and is fixedly connected with the first connecting rod;
the hydraulic controllers 6-10 are electrically connected with the first controller 8.
The working process of the adjusting mechanism of the invention is as follows: the flow sensor 7 monitors the running flow of the shaft-extending tubular pump, signals are transmitted to the first controller 8, when the flow monitored by the flow sensor 7 is in a certain set regulation interval, the first controller 8 controls the hydraulic controller 6-10 to start, stop and run, the hydraulic controller 6-10 pushes the piston rod 6-11 of the hydraulic cylinder to extend, and then pushes the second connecting rod 6-12 to make the first connecting rod 6-13 rotate around the second rotating shaft, so that the first bevel gear and the second bevel gear rotate to drive the first rotating shaft and the U-shaped connecting rod to rotate, and the movable blades 6-2-1 and 6-2-2 connected with the first rotating shaft rotate to corresponding angular positions theta: the purpose of adjusting the number of the guide vanes and the positions of the vanes is achieved. Wherein a piston rod of the hydraulic cylinder, the first connecting rod and the second connecting rod form a connecting rod mechanism. The adjusting mechanism has stable operation, high adjusting precision and small error.
In the present embodiment, said U-shaped connecting rod 6-5 comprises two axial connecting rod portions and a radial connecting rod portion; the axial connecting rod part is positioned on the surface of the flow guide hub and fixedly connected with the connecting ring 6-4, and the blade root part of the movable blade is fixedly connected with the axial connecting rod part and the connecting ring; the radial connecting rod part is positioned at the tail end of the flow guide hub and is fixedly connected with the first rotating shaft.
In the present embodiment, as shown in fig. 8, the inducer hub 6-1 has a hollow cylindrical shape, an outer diameter D1 of 590mm, an inner diameter D2 of 520mm, and a flow passage diameter D3 of 1800 mm. The guide hub is provided with a groove, the connecting ring is movably clamped in the groove, the connecting ring is prevented from moving along the axial direction of the guide hub and even falling off, the groove plays a limiting role, and the structural stability is improved.
In the present embodiment, as shown in fig. 8 and 9, the length ratio of the second link 6-12 to the first link 6-13 is L3: l4 ═ 1: 1.2; the transmission ratio of the first bevel gear to the second bevel gear is 1: 1. the thickness of the guide vane is 12mm, the axial length L2 of the guide vane is 1100mm, the axial length of the guide hub is L1, and the ratio of L2 to L1 is 1: 1.4; the shell is L-shaped, comprises an axial shell and a radial shell, and is cylindrical, and the diameter of the shell is 80 mm; the axial housing length is 280 mm.
The control method based on the flow guide device comprises the following steps:
step one, the flow sensor detects the running flow Q of the shaft-extending through-flow pump in real timeaAnd sending the detection information to the first controller;
after receiving a detection signal of the flow sensor, the first controller compares the detection signal with a rated flow Q of the shaft-extending tubular pump, sends an instruction to the hydraulic controller according to a comparison result, drives a piston rod of the piston type hydraulic cylinder to extend or shorten, drives the connecting ring and the movable blade to rotate around the guide hub through the rotation of the first bevel gear and the second bevel gear, and further controls the rotation angle theta of the movable blade; the angle theta is formed by a movable blade and a fixed bladeWhen the sheets are attached, the position of the radial connecting rod part is an initial position, and when the movable blade rotates to a preset position, an included angle between the connecting rod part and the initial position is theta; the angle theta and the actual operation flow Q of the shaft extension tubular pumpaThe relationship is as follows in Table 3:
TABLE 3 running flow Q of shaft extension through-flow pumpaIn relation to the state of the guide vanes
| Running flow Q of shaft extension through-flow pumpa | Angle theta | Number of guide vanes | Stationary and moving blade states |
| Qa≥1.0Q | 0° | 2 | Bonding |
| 0.8Q≤Qa<1.0Q | 45° | 4 | Separation of |
| 0.6Q≤Qa<0.8Q | 90° | 4 | Separation of |
The method specifically comprises the following steps: 1) when theta is 0 degree, the movable blades 6-2(6-2-1, 6-2-2) are tightly attached to the guide vane fixed blades 6-3(6-3-1, 6-3-2), and the number of the blades playing a role in guiding flow can be regarded as 2, as shown in fig. 2;
2) and when the theta is larger than or equal to 0 degree, the movable blades are separated from the fixed blades, and the number of the blades playing a role in guiding the flow is 4 at the moment, as shown in figure 3.
The first embodiment is as follows:
carrying out a pressure pulsation measurement test on a shaft extension tubular pump of a certain pump station, wherein a flow guide device is not arranged in the pump station;
establishing a first water pump model of the pump station through simulation software, and simulating an unsteady numerical value of the first water pump model within 2.4s in 10 periods under a rated working condition; and simultaneously, carrying out real machine test on the pump station under the same parameters.
The results show that the relative errors of the numerical simulation pressure pulsation monitoring points at the front end of the front guide vane area and the front end of the impeller area of the shaft extension through-flow pump of the pump station and the time domain data of the real machine test data are within 7 percent, the waveforms are basically consistent, the primary and secondary frequencies of the frequency domain are consistent, the established model is proved to be accurate, and the accuracy of numerical simulation is ensured.
Defining a dimensionless pressure coefficient CpTo describe the pressure pulsation characteristic of each monitoring point, the expression is as follows:
in the formula, CpIs a dimensionless pressure coefficient, piIs the static pressure value of a monitoring point at a certain moment in Pa, paveIs the average value of static pressure in Pa in one rotation period.
And a second model is established through simulation software, the pump station of the second model is provided with the flow guide device, and other parameters are the same as those of the first model.
Four monitoring points are respectively arranged at the inlet of a front guide vane area, the inlet of an impeller area, the outlet of the impeller area and the outlet of a rear guide vane area of the axial-extension tubular pump in the model I and the model II, numerical simulation is carried out, and the pressure coefficients C of different monitoring points under corresponding conditions are respectively calculatedpCharacterizing the time-domain variation of the pressure pulsation by its standard deviationThe amplitude values were quantified as shown in Table 4. Four monitoring points of an inlet of the front guide vane area 2, an inlet of the impeller area 3, an outlet of the impeller area 3 and an outlet of the rear guide vane area 4 are recorded as a1, b1, c1 and d1 in sequence. And when the movable blade is at different angle positions theta in the model II, the pressure pulsation time domain comparison of the four monitoring points is numerically simulated.
Table 4: pressure coefficient C of numerical simulation of four monitoring points of model I and model IIpAnd amplitude reduction
By combining the data, it can be obviously seen that under different flow conditions, the pressure pulsation change amplitudes of monitoring points at four key positions in the second model are all greatly reduced (except for the outlet d1 of the rear guide vane area under the condition that Qa is 0.8Q. under the condition that the outlet d1 of the rear guide vane area has a vortex with violent change, the water outlet channel is additionally provided with a guide plate, so that the pulsation improvement effect at the outlet under the condition is not good), the vortex flow state in the water outlet channel is greatly improved, and the vortex elimination effect is obvious. The guide device designed by the invention can change the number of the guide plate blades and the positions of the guide plate blades according to the actual operation flow change of the shaft-extension tubular pump, effectively adjust the flow state in the flow passage under different flow working conditions and effectively eliminate the vortex in the flow passage, and has obvious effect of improving the pressure pulsation characteristics of key areas such as a pump section of the shaft-extension tubular pump.
Descriptions not related to the embodiments of the present invention are well known in the art, and may be implemented by referring to the well-known techniques. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The flow guide device for the shaft extension tubular pump based on the number of adjustable blades is characterized by comprising a flow guide main body, an adjusting mechanism, a flow sensor and a first controller; the flow sensor is arranged at the inlet of a front guide vane area of the shaft-extension through-flow pump;
the guide main body is arranged in a bent pipe section of a water outlet channel of the shaft-extending tubular pump and comprises guide blades and a guide hub, and the guide blades comprise fixed blades and movable blades; the flow guide hub is cylindrical, and the axis of the flow guide hub is superposed with the central line of the bent pipe section of the water outlet runner; one radial end of the fixed blade is fixedly connected with the flow guide hub, and the other radial end of the fixed blade is fixedly connected with the inner wall of the water outlet runner bent pipe; the outer surface of the flow guide hub is movably sleeved with a connecting ring, one radial end of each movable blade is fixedly connected with the connecting ring, the other radial end of each movable blade is a free end, and the fixed blade and the movable blade are the same in shape;
the adjusting mechanism is used for adjusting the included angle between the adjacent fixed blade and the movable blade, and the flow sensor and the electrical appliance assembly of the adjusting mechanism are electrically connected with the first controller.
2. The flow guide device for the shaft-extension tubular pump based on the adjustable blade number as claimed in claim 1, wherein a plane perpendicular to the axis of the center line of the bent section of the outlet flow channel is taken as a plane a, the section of the flow guide hub and the plane a is a circular ring, the inner circle of the circular ring is taken as a base circle, the involute of the circular ring in the plane a is taken as a profile M1 of the flow guide blade, and the profile M1 is stretched along the axis of the center line of the bent section of the flow channel to obtain the side surface of the flow guide blade;
taking the circle center of the base circle as an origin, establishing a rectangular coordinate system in the plane A, selecting a plurality of key points on the molded line M1, and fitting an equation of the molded line M1 according to the coordinate values of the key points:
the profile M1 corresponds to the outboard curve equation of the guide vane: y is 4 × 10-14x6-9×10-11x5+9×10-8x4-4×10-5x3+0.0115x2-1.8958x-297.33；
The profile M1 corresponds to the inner curve equation of the guide vane: y is 5 × 10-14x6-1×10-10x5+1×10-7x4-6×10-5x3+0.0148x2-2.2407x-271.09。
3. The adjustable vane count based flow directing device for a shaft extension flow pump of claim 2, wherein the adjustment mechanism comprises a transmission assembly and a hydraulic system, the hydraulic system comprising a hydraulic controller and a piston cylinder; the transmission assembly comprises a U-shaped connecting rod, a first rotating shaft, a first bevel gear, a second rotating shaft, a first connecting rod and a second connecting rod, one end of the U-shaped connecting rod is fixedly connected with the connecting ring, the other end of the U-shaped connecting rod is fixedly connected with the first rotating shaft, the other end of the first rotating shaft is fixedly connected with the first bevel gear, and the axis of the first rotating shaft is superposed with the central line of the flow guide hub; the first bevel gear is meshed with the second bevel gear, and the second bevel gear is fixedly connected with one end of the second rotating shaft; the first rotating shaft and the second rotating shaft are vertical to each other; the other end of the second rotating shaft is fixedly connected with one end of a first connecting rod, the other end of the first connecting rod is hinged with one end of a second connecting rod, and the other end of the second connecting rod is hinged with a piston rod of the piston type hydraulic cylinder;
a shell is arranged in the flow channel, and one end of the shell is fixedly connected with the side wall of the bent pipe; the first rotating shaft, the first bevel gear, the second bevel gear and the second rotating shaft are arranged in the shell; the hydraulic system, the first controller, the first connecting rod and the second connecting rod are arranged outside the flow channel, one end of the second rotating shaft is positioned in the shell, and the other end of the second rotating shaft penetrates through the side wall of the bent pipe and is fixedly connected with the first connecting rod;
the hydraulic controller is electrically connected with the first controller.
4. The adjustable vane count based flow directing device for an axial flow pump of claim 3, wherein the U-shaped connecting rod comprises two axial connecting rod portions and a radial connecting rod portion; the axial connecting rod part is positioned on the surface of the flow guide hub and fixedly connected with the connecting ring, and the blade root part of the movable blade is fixedly connected with the axial connecting rod part and the connecting ring; the radial connecting rod part is positioned at the tail end of the flow guide hub and is fixedly connected with the first rotating shaft.
5. The flow guide device for an axial flow pump according to claim 3, wherein the length ratio of the second link to the first link is 1: (1-1.2).
6. Flow guiding device for an axial flow pump based on adjustable blade count according to any of claims 1-5, characterized in that the flow guiding hub is provided with a recess, and the connection ring is movably clamped in the recess.
7. The flow guide device for an axial flow pump based on adjustable blade count of claim 6, wherein the fixed blade and the movable blade are both 2 pieces;
the thickness of the guide vane is 12mm, the axial length L2 of the guide vane is 1100mm, the axial length of the guide hub is L1, and the ratio of L2 to L1 is 1: (1-1.4).
8. The adjustable vane count based flow directing device for a shaft extension flow pump of claim 6, wherein the first bevel gear and second bevel gear transmission ratio is 1: 1.
9. the flow guide device for an adjustable vane count shaft extension flow pump of claim 6, wherein the housing is L-shaped, comprises an axial housing and a radial housing, each being cylindrical, and has a diameter of 80 mm; the axial housing length is 280 mm.
10. The control method of the deflector device according to any one of claims 1 to 9, comprising the steps of:
step one, the flow sensor detects the running flow Q of the shaft-extending through-flow pump in real timeaAnd sending the detection information to the first controller;
after receiving the detection signal of the flow sensor, the first controller compares the detection signal with the rated flow Q of the shaft-extending tubular pump, sends an instruction to the hydraulic controller according to the comparison result, drives the piston rod of the piston type hydraulic cylinder to extend or shorten, and drives the piston rod of the piston type hydraulic cylinder to extend or shorten through the first bevel gear and the second bevel gearThe rotation of the gear drives the connecting ring and the movable blade to rotate around the flow guide hub, so that the rotation angle theta of the movable blade is controlled; the angle theta is an initial position which is the position of the radial connecting rod part when the movable blade is attached to the fixed blade, and an included angle between the connecting rod part and the initial position when the movable blade rotates to a preset position is theta; the angle theta and the actual operation flow Q of the shaft extension tubular pumpaThe relationship is as follows:
。
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| CN113202819B (en) | 2024-05-28 |
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