CN108225634B - Energy efficiency measuring device and measuring method for hyperboloid stirrer - Google Patents
Energy efficiency measuring device and measuring method for hyperboloid stirrer Download PDFInfo
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- CN108225634B CN108225634B CN201711402199.0A CN201711402199A CN108225634B CN 108225634 B CN108225634 B CN 108225634B CN 201711402199 A CN201711402199 A CN 201711402199A CN 108225634 B CN108225634 B CN 108225634B
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- 238000000034 method Methods 0.000 title claims description 14
- 238000012360 testing method Methods 0.000 claims abstract description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 25
- 239000003381 stabilizer Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000007423 decrease Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004379 similarity theory Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The embodiment of the invention discloses an energy efficiency measuring device for a hyperboloid stirrer, which comprises a variable frequency motor, a speed reducer, a rack, a transmission shaft, a stabilizer bar, a guide cylinder, a velocimeter, a test pool, an impeller model, a connecting rod, a torque sensor and a turbulent flow plate. The variable frequency motor, the speed reducer and the stand are positioned above the test pool, a power output shaft of the variable frequency motor is connected with an input shaft of the speed reducer, the power output shaft of the speed reducer is in transitional connection with the transmission shaft through the stand, and a torque sensor is assembled between the power output shaft of the speed reducer and the transmission shaft; the rack is fixedly connected to the test water tank, and the transmission shaft is positioned in the test water tank; the guide cylinder is fixed at the center of the test pool through a stabilizer bar; the transmission shaft is positioned in the inner cavity of the guide cylinder, the transmission shaft is coaxial with the guide cylinder, and two ends of the transmission shaft penetrate out of the guide cylinder; the velocimeter is fixedly connected to the connecting rod, the connecting rod is connected between the test pool and the guide cylinder, and the velocimeter is located on the same section of the test pool. The energy efficiency of the hyperboloid stirrer can be measured, and the testing device is simple and the testing method is reliable.
Description
Technical Field
The invention belongs to the technical field of environmental protection equipment, and particularly relates to an energy efficiency measuring device and an energy efficiency measuring method for a hyperboloid stirrer.
Background
The hyperboloid stirrer is suitable for mixing and stirring mixed liquid in municipal engineering and other industries, and the quota is that the motor is operated for 24 hours continuously, so that the energy consumption is high. Energy efficiency is a core index of a hyperboloid stirrer, and specific power is generally used for checking energy efficiency. The specific power measurement of the hyperboloid stirrer has not been effective until now, namely, the power consumed per cubic meter of water body when fluid is not precipitated is measured, the unit is watt per cubic meter (W/m 3).
Disclosure of Invention
The invention provides an energy efficiency measuring device and an energy efficiency measuring method for a hyperboloid mixer, which can realize the energy efficiency measurement of the hyperboloid mixer, and the measuring device is simple and the measuring method is reliable.
In order to solve the technical problems, the embodiment of the invention adopts the following technical scheme:
the energy efficiency measuring device for the hyperboloid stirrer comprises a variable frequency motor, a speed reducer, a rack, a transmission shaft, a stabilizer bar, a guide cylinder, a velocimeter, a test pool, a connecting rod, a torque sensor and a turbulent flow plate; the variable frequency motor, the speed reducer, the rack and the torque sensor are positioned above the test pool, a power output shaft of the variable frequency motor is connected with an input shaft of the speed reducer, the power output shaft of the speed reducer is in transitional connection with the transmission shaft through the rack, and the torque sensor is assembled between the power output shaft of the speed reducer and the transmission shaft; the rack is fixedly connected to the test water tank, and the transmission shaft is positioned in the test water tank; the guide cylinder is fixed at the center of the test pool through a stabilizer bar; the transmission shaft is positioned in the inner cavity of the guide cylinder, the transmission shaft is coaxial with the guide cylinder, and two ends of the transmission shaft penetrate out of the guide cylinder; the velocimeter is fixedly connected to the connecting rod, the connecting rod is connected between the test water tank and the guide cylinder, and the velocimeter is positioned on the same section of the test water tank; the turbulence plate is fixedly connected to the wall surface of the test pool.
As a preferable example, the energy efficiency measuring device for the hyperboloid stirrer further comprises an impeller model, wherein the impeller model is connected to the lower end of the transmission shaft.
As a preferable example, the installation height of the velocimeter is 1/3-2/3 of the water depth in the test pool.
As a preferable example, four connecting rods are provided, the included angle between two adjacent connecting rods in the four connecting rods is 90 degrees, and n velocimeters are distributed on each connecting rod; n is an integer.
As a preferred example, the number of the turbulence plates is four, and the four turbulence plates are uniformly distributed along the circumferential direction of the test pool.
As a preferable example, the test water tank is round, the diameter of the test water tank is 8-12 times of the diameter of the impeller model, and the water depth in the test water tank is 8-12 times of the diameter of the impeller model.
As a preferable example, the distance h1 from the top of the impeller model to the bottom of the guide cylinder is 300-600 mm, the distance h2 from the bottom of the impeller model to the bottom of the test pool is 1.2 times of the diameter of the impeller model, and the distance h3 from the top of the guide cylinder to the water surface in the test pool is 800-1200 mm.
In another aspect, an embodiment of the present invention provides a method for measuring energy efficiency of a hyperboloid mixer, including:
step 10), starting a variable frequency motor to drive a transmission shaft and an impeller model to rotate, wherein the impeller model stirs water in a test pool; measuring the axial flow velocity of the water by using a velocimeter;
step 20), collecting measurement values of each velocimeter at the same time, and calculating the axial average speed of water flow of the section where the velocimeter is positioned;
step 30) calculating the average water flow speed of m sections at m different moments by adopting the method of step 20), and then calculating the total average water flow speed of m+1 times;
step 40) when the total water flow axial velocity of the section is not equal to the flow velocity of the mixed liquid without precipitation, adjusting the rotating speed of the variable frequency motor, and returning to the step 20), and recalculating the total water flow axial velocity of the section until the total water flow axial velocity is equal to the preset flow velocity of the mixed liquid without precipitation;
step 50) measuring the torque of the torque sensor when the preset flow rate of the mixed liquid is reached, and calculating the shaft power of the stirrer;
step 60), measuring and calculating the specific power of the impeller model;
step 70) converting the specific power of the impeller model into the specific power of the actual impeller and the actual rotating speed according to a similar theory.
Preferably, in the step 20), the average speed of each velocimeter is taken as the average speed of the section.
As a preferred example, the step 60) specifically includes: the ratio of the shaft power of the stirrer to the volume of the test pool is taken as the specific power of the impeller model.
Compared with the prior art, the energy efficiency measurement of the hyperboloid stirrer can be realized, and the testing device is simple and the testing method is reliable. The embodiment of the invention adopts the reduced model impeller and the power device, so that the test pool is greatly reduced, the cost is effectively reduced, a concrete pool is not required, the test pool can be rolled by steel plates, and the test pool is convenient and low in cost. The device has no too many test parts and has simple structure; the flow rate measurement is carried out according to the flow characteristics of water and the average flow rate of each section, and the test method is reliable.
Drawings
FIG. 1 is a schematic diagram of a hyperboloid mixer;
FIG. 2 is a schematic diagram of an energy efficiency measuring apparatus according to an embodiment of the present invention;
FIG. 3 is a top view of an energy efficiency measuring apparatus according to an embodiment of the present invention.
The drawings are as follows: variable frequency motor 1, speed reducer 2, frame 3, transmission shaft 4, stabilizer bar 5, draft tube 6, velocimeter 7, test pool 8, impeller model 9, connecting rod 10, torque sensor 11, turbulent flow plate 12.
Detailed Description
The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.
A double curved surface mixer is schematically shown in fig. 1. The hyperboloid mixer mainly comprises a motor, a speed reducer, a frame, a transmission shaft and an impeller. The power output shaft of the motor is connected with the input shaft of the speed reducer, the power output shaft of the speed reducer is in transitional connection with the transmission shaft through the frame, and the impeller is assembled at the lower end of the transmission shaft.
As shown in fig. 2, the energy efficiency measuring device for the hyperboloid stirrer according to the embodiment of the invention comprises a variable frequency motor 1, a speed reducer 2, a frame 3, a transmission shaft 4, a stabilizer bar 5, a guide cylinder 6, a velocimeter 7, a test pool 8, a connecting rod 10, a torque sensor 11 and a turbulence plate 12. The variable frequency motor 1, the speed reducer 2, the frame 3 and the torque sensor 11 are located above the test pool 8, a power output shaft of the variable frequency motor 1 is connected with an input shaft of the speed reducer 2, the power output shaft of the speed reducer 2 is in transitional connection with the transmission shaft 4 through the frame 3, and the torque sensor 11 is assembled between the power output shaft of the speed reducer 2 and the transmission shaft 4. The rack 3 is fixedly connected to the test pool 8, and the transmission shaft 4 is positioned in the test pool 8; the guide cylinder 6 is fixed at the center of the test pool 8 through the stabilizer bar 5; the transmission shaft 4 is positioned in the inner cavity of the guide cylinder 6, the transmission shaft 4 is coaxial with the guide cylinder 6, and two ends of the transmission shaft 4 penetrate out of the guide cylinder 6; the velocimeter 7 is fixedly connected to the connecting rod 10, the connecting rod 10 is connected between the test pool 8 and the guide cylinder 6, and the velocimeter 7 is located on the same section of the test pool 8. The turbulence plate 12 is fixedly attached to the wall of the test tank 8.
When the energy efficiency measuring apparatus having the above-described structure is used, the impeller model 9 is mounted on the lower end of the drive shaft 4. The energy efficiency of the impeller model 9 is measured and converted into the energy efficiency of an actual hyperboloid stirrer.
In the above embodiment, the stabilizer bars 5 are preferably distributed in the upper and lower portions of the guide cylinder. Eight stabilizer bars may be provided. Four stabilizer bars are distributed at the upper part, and the other four stabilizer bars are distributed at the lower part. The upper and lower stabilizer bars 5 are uniformly distributed. The turbulence plates 12 are preferably evenly disposed circumferentially about the test basin 8. The turbulence plates 12 may be arranged in four, and the four turbulence plates 12 are evenly distributed along the circumference of the test basin 8. The turbulence plate 12 functions to convert tangential flow into radial flow and axial flow to thoroughly mix and agitate the water flow in the basin up and down.
In operation, water is contained in the test tank 8. The water flows through the impeller model 9, the tachometer 7 and the guide cylinder 6. The variable frequency motor 1 is started, speed is regulated through the speed reducer 2, and the variable frequency motor 1 drives the transmission shaft 4 to rotate. Since the impeller pattern 9 is mounted at the lower end of the drive shaft 4, the impeller pattern 9 rotates following the drive shaft 4. Rotation of the impeller pattern 9 will drive the flow of water in the test basin 8. Ideally, the water outside the guide cylinder 6 flows from bottom to top, and the water inside the guide cylinder 6 flows from top to bottom. In practice, of course, it is not possible for all of the water immediately outside the guide shell 6 to flow from bottom to top. Only the main flow direction of the water flow is considered here, the water flow immediately outside the guide cylinder 6 being ignored. The stirring effect of the hyperboloid stirrer is as follows: the diameter of the hub gradually decreases from bottom to top, tangential force gradually decreases when the rotation speed is fixed, resultant force of the tangential force gradually decreases, and the mixed liquid forms a flowing state of the outer ring from bottom to top and the inner ring from top to bottom under the action of the turbulent flow plate 12. The purpose of the guide shell 6 is to ensure that the flow of water is approximately equal to the upward flow (outside the guide shell) and the downward flow (inside the guide shell) as described above. The tachometer 7 measures the axial velocity of the water flow through the tachometer 7.
The testing device can adopt a circular testing water tank 8, the diameter of the testing water tank 8 is 8-12 times of the diameter of the impeller model 9, the water depth of the testing water tank 8 is 8-12 times of the diameter of the impeller model 9, and the testing medium is clean cold water. The guide cylinder 6 is in a thin-wall cylinder shape, and the inner diameter of the guide cylinder is 1.1 times of the diameter of the impeller model 9, so that the impeller model 9 can conveniently move up and down. The guide cylinder 6 is fixed at the center of the test pool 8 by a stabilizer bar 5. The variable frequency motor 1 can adjust different rotating speeds according to the needs.
When the hyperboloid stirrer operates, the main flow direction of fluid at the outer side of the guide cylinder 6 is from bottom to top; the direction of fluid flow inside the guide cylinder 6 is from top to bottom, and the circulation is continued. The average flow velocity of any section is approximately equal between the guide cylinder 6 and the wall surface of the test pool 8.
Because of the limitation of the conditions, the actual impeller and the device have oversized, the rotating speed is too high, and the true machine test is difficult to carry out. The impeller model converts real parameters into model parameters according to a similarity theory, and is economical and practical compared with practice by using a small model test.
As a preferred example, the installation height of the velocimeter 7 is between 1/3 and 2/3 of the water depth in the test pool 8. The velocimeter is arranged on the outer side of the guide cylinder 6, the unstable state of water flow at the two ends of the guide cylinder 6 is removed, and the velocimeter 7 is arranged between 1/3 and 2/3 of the water depth, so that the water flow speed can be accurately measured.
As a preferred example, the number of the connecting rods 10 is four, the included angle between two adjacent connecting rods 10 in the four connecting rods 10 is 90 degrees, and n velocimeters 7 are distributed on each connecting rod 10. n is an integer. Preferably, n is 3, 4 or 5. When the test tank 8 is circular, theoretically, the flow of water around the test tank 8 is the same, and the arrangement and simplification are facilitated by selecting 4 directions to install the velocimeter 7.
As a preferred example, the test pool 8 is circular, the diameter of the test pool 8 is 8-12 times of the diameter of the impeller model 9, and the water depth in the test pool 8 is 8-12 times of the diameter of the impeller model 9. The diameter of the limited test pool 8 is 8-12 times of the diameter of the impeller model 9, and the high cost caused by the oversized test pool 8 is reduced. The depth of the water contained in the test pool 8 is 8-12 times of the diameter of the impeller model 9. Certain water depth ensures certain stirring effect.
As a preferable example, the distance h1 from the top of the impeller model 9 to the bottom of the guide cylinder 6 is 300 mm-600 mm, the distance h2 from the bottom of the impeller model 9 to the bottom of the test pool 8 is 1.2 times the diameter of the impeller model 9, and the distance h3 from the top of the guide cylinder 6 to the water surface in the test pool 8 is 800 mm-1200 mm. The parameters are selected to ensure that the bottom of the impeller model 9 is at a certain distance from the bottom of the tank, and also ensure that the top of the impeller model 9 is at a certain distance from the bottom of the guide cylinder 6, so that water at the upper part can enter the guide cylinder 6 conveniently.
The energy efficiency measurement of the hyperboloid stirrer is carried out by using the device of the embodiment, and the specific method comprises the following steps:
step 10), starting the variable frequency motor 1, driving the transmission shaft 4 and the impeller model 9 to rotate, and stirring water in the test pool 8 by the impeller model 9; measuring the axial flow velocity of the water by using a velocimeter 7;
step 20), collecting the measurement value of each velocimeter 7 at the same time, and calculating the axial average speed of water flow of the section where the velocimeter 7 is positioned;
step 30) calculating the average velocity of the water flow of the m sections by adopting the method of step 20) at m different moments, and then calculating the total axial average velocity of the water flow of m+1 times;
step 40) when the total water flow average speed of the section is not equal to the flow rate of the mixed liquid without precipitation, adjusting the rotating speed of the variable frequency motor 1, and returning to the step 20), and recalculating the total water flow axial average speed of the section until the total water flow average speed of the section is equal to the preset flow rate of the mixed liquid without precipitation;
step 50) measuring the torque of the torque sensor when the preset flow rate of the mixed liquid is reached, and calculating the shaft power of the stirrer;
step 60), measuring and calculating the specific power of the impeller model 9;
step 70) converting the specific power of the impeller model 9 into specific power of an actual impeller and an actual rotating speed according to a similar theory of a pump.
In the above embodiment, in the step 20), the average speed of each velocimeter 7 is taken as the axial average speed of the cross section.
In said step 50), calculating the shaft power P of the mixer according to formula (1);
P=2πnT/60 (1)
Wherein: n is the final rotational speed of the impeller model 9 and T is the torque of the torque sensor 11.
The step 60 specifically includes: the ratio of the shaft power of the mixer to the volume of the test tank 8 was taken as the specific power of the impeller model 9.
The embodiments described herein are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Equivalent changes and modifications of the invention are intended to be within the scope of the present invention.
Claims (10)
1. The utility model provides an energy efficiency measuring device for hyperboloid mixer, its characterized in that, measuring device includes inverter motor (1), speed reducer (2), frame (3), transmission shaft (4), stabilizer bar (5), draft tube (6), velocimeter (7), test pond (8), connecting rod (10), torque sensor (11) and turbulent flow board (12), inverter motor (1), speed reducer (2), frame (3) and torque sensor (11) are located the top of test pond (8), the power take off shaft of inverter motor (1) is connected with the input shaft of speed reducer (2), the power take off shaft and transmission shaft (4) of speed reducer (2) pass through frame (3) transitional coupling, assemble torque sensor (11) between the power take off shaft and the transmission shaft (4) of speed reducer (2); the rack (3) is fixedly connected to the test pool (8), and the transmission shaft (4) is positioned in the test pool (8); the guide cylinder (6) is fixed at the center of the test pool (8) through the stabilizer bar (5); the stabilizer bars (5) are distributed at the upper part and the lower part of the guide cylinder; the transmission shaft (4) is positioned in the inner cavity of the guide cylinder (6), the transmission shaft (4) is coaxial with the guide cylinder (6), and two ends of the transmission shaft (4) penetrate out of the guide cylinder (6); the velocimeter (7) is fixedly connected to the connecting rod (10), the connecting rod (10) is connected between the test water tank (8) and the guide cylinder (6), and the velocimeter (7) is positioned on the same section of the test water tank (8); the turbulence plate (12) is fixedly connected to the wall surface of the test pool (8).
2. The energy efficiency measuring apparatus for a hyperboloid mixer according to claim 1, wherein: the device also comprises an impeller model (9), wherein the impeller model (9) is connected to the lower end of the transmission shaft (4).
3. The energy efficiency measuring apparatus for a hyperboloid mixer according to claim 1, wherein: the installation height of the velocimeter (7) is 1/3-2/3 of the water depth in the test pool (8).
4. The energy efficiency measuring apparatus for a hyperboloid mixer according to claim 1, wherein: the number of the connecting rods (10) is four, the included angle between two adjacent connecting rods (10) in the four connecting rods (10) is 90 degrees, and n velocimeters (7) are distributed on each connecting rod (10); n is an integer.
5. The energy efficiency measuring apparatus for a hyperboloid mixer according to claim 1, wherein: the number of the turbulence plates (12) is four, and the four turbulence plates (12) are uniformly distributed along the circumferential direction of the test pool (8).
6. The energy efficiency measuring apparatus for a hyperboloid mixer according to claim 2, wherein: the test water tank (8) is circular, the diameter of the test water tank (8) is 8-12 times of the diameter of the impeller model (9), and the water depth in the test water tank (8) is 8-12 times of the diameter of the impeller model (9).
7. The energy efficiency measuring apparatus for a hyperboloid mixer according to claim 2, wherein: the distance h1 from the top of the impeller model (9) to the bottom of the guide cylinder (6) is 300-600 mm, the distance h2 from the bottom of the impeller model (9) to the bottom of the test pool (8) is 1.2 times the diameter of the impeller model (9), and the distance h3 from the top of the guide cylinder (6) to the water surface in the test pool (8) is 800-1200 mm.
8. The energy efficiency measuring method of the hyperboloid stirrer is characterized by comprising the following steps of: the method comprises the following steps:
step 10), starting a variable frequency motor (1), driving a transmission shaft (4) and an impeller model (9) to rotate, and stirring water in a test pool (8) by the impeller model (9); measuring the flow rate of the water by a velocimeter (7);
step 20), collecting measurement values of each velocimeter (7) at the same moment, and calculating the average speed of water flow of the section where the velocimeter (7) is positioned;
step 30) calculating the average water flow speed of m sections at m different moments by adopting the method of step 20), and then calculating the total average water flow speed of m+1 times;
step 40) when the total water flow average speed of the section is not equal to the flow rate of the mixed liquid without precipitation, adjusting the rotating speed of the variable frequency motor (1), and then returning to the step 20), and recalculating the total water flow average speed of the section until the total water flow average speed is equal to the preset flow rate of the mixed liquid without precipitation;
step 50) measuring the torque of the torque sensor when the preset flow rate of the mixed liquid is reached, and calculating the shaft power of the stirrer;
step 60) measuring and calculating the specific power of the impeller model (9);
step 70) converting the specific power of the impeller model (9) into the specific power of the actual impeller and the actual rotating speed according to a similar theory.
9. The energy efficiency measuring method of the hyperboloid stirrer according to claim 8, wherein: in step 20), the average speed of each velocimeter (7) is taken as the average speed of the section.
10. The energy efficiency measuring method of a hyperboloid stirrer according to claim 8 or 9, wherein: the step 60) specifically includes: the ratio of the shaft power of the stirrer to the volume of the test water tank (8) is taken as the specific power of the impeller model (9).
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| CN201711402199.0A CN108225634B (en) | 2017-12-22 | 2017-12-22 | Energy efficiency measuring device and measuring method for hyperboloid stirrer |
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| CN201711402199.0A CN108225634B (en) | 2017-12-22 | 2017-12-22 | Energy efficiency measuring device and measuring method for hyperboloid stirrer |
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| JP2010247112A (en) * | 2009-04-17 | 2010-11-04 | Hitachi Plant Technologies Ltd | Agitator |
| CN102600746A (en) * | 2012-03-29 | 2012-07-25 | 南京蓝深制泵集团股份有限公司 | Submersible hyperboloid mixer |
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| CN104635157A (en) * | 2015-01-20 | 2015-05-20 | 山东拓博节能科技有限公司 | Test board of low-revolution-speed large-torque motor |
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