Stirrer power calculation 5 steps: viscosity → speed → diameter → power → check + 5 kinds of formula + 5 steps to avoid pits
Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-08-08
The power selection calculation of the agitator is deviated, and it is easy to cause the motor overload and burn or the material mixing is uneven.Located in Baoji, China Titanium Valley, Shaanxi Qianyi Tuoda Technology Co., Ltd. has been manufacturing titanium non-standard chemical equipment for many years., In all placestitanium stirrerDuring the customization project, Contact with many cases of selection errors, Many project drawings indicate 7.5 kW, High viscosity of medium under actual working conditions, 15 kW actually requiredThere are also many projects with less power reserve margin, and motor damage occurs during equipment start-up.this article is organizedtitanium stirrerComplete practical operation idea of power calculation, Includes a five-step calculation process, Reference Formulas for Five Types of Blades, Key points of five-step pit avoidance and practical operation reference cases of multiple projects, help industry, environmental protection, Metallurgical industry technicians do welltitanium stirrerPower selection work.
The agitator power calculation is divided into five key links as a whole, medium viscosity determination, Stirring speed setting, Blade diameter confirmation, theoretical power calculation, Torque and working condition comprehensive check.Every step of parameter change will directly affect the stability of the whole titanium stirring equipment, Deviation in parameter calculation, Motor damage, The whole set of equipment cannot be put into normal operation, Unnecessary project losses were incurred.
Stirring power is affected by many physical variables, The influence of blade diameter D on power is more prominent, Power is proportional to blade diameter to the fifth power, 10% variation in blade diameter, Power variation up to 60%Speed N and power are cubic proportional, speed changes 10%, power changes about 33%;The medium viscosity μ also has a significant effect on power, The overall power demand will increase significantly under high viscosity material conditionsIn addition, different blade types correspond to different power numbers Np, Propelling blade Np 0.32, Normal propeller blade Np value 1.5, The parameters need to be adjusted according to the blade type when selecting the type.A lot of techies have questions., Which variable has the highest degree of influence among stirring power, Combined with engineering practice, the influence of blade diameter D is the most significant, A difference of only 1 cm in blade diameter, it can cause power fluctuations of up to 50 percent.titanium stirrerThe blade diameter parameters need to be calculated strictly in the custom design stage.
Different blade structures adapt to different viscosity conditions, Five types of commonly used blades correspond to different power numbers, Viscosity interval and application scenario.Propulsive blade power range 0.32‑0.45, Adapt to materials with viscosity not greater than 500cP, Mostly used for homogeneous mixing scenarios of low viscosity materialsTurbine blade power 1.0‑2.0, suitable viscosity ≤5000cP, suitable for medium viscosity material dispersion, emulsification process;Paddle blade power number 1.5‑2.5, suitable viscosity ≤10000cP, mostly used for medium viscosity liquid-liquid mixing;Anchor blade power 2.0‑3.5, suitable viscosity 10000‑50000cP, mainly used for high viscosity materials and tank wall scraping operations;Ribbon blade power 3.0‑5.0, Suitable for ultra-high viscosity materials with viscosity greater than or equal to 50000cP, Emphasis on heat transfer agitation conditions.
Stirrer power calculation complete SOP process a total of five steps.step 1, determine that viscosity mu of the medium, consulting a physical property paramete table of the corresponding material, and selecting an adaptive blade type according to the viscosity value;Step 2: Determine the stirring speed N, Normal speed range 60‑300rpm, Follow low viscosity, choose high speed, Engineering Idea of Selecting Low Speed for High ViscosityStep 3 Determine blade diameter D, the ratio D/T of blade diameter to tank inn diameter is controlled in that range of 0.3‑0.6, T represents the internal diameter of the tankStep 4 Power calculation, P = Np × ρ × N³ × D (SI units), Superpose 1.2 times operating condition margin after calculationThe fifth step is to carry out comprehensive verification, Torque verification is done using the torque formula T = 9550 × P/N, At the same time, taking into account the equipment start-up conditions, Comprehensive judgment of actual production conditions on site.
There is a reference range for blade selection and power corresponding to different viscosity range materials.Low viscosity materials such as water system viscosity 1‑50cP, priority propulsion type, turbine blade, power reference 0.5‑5 kW;Dilute acid, dilute alkali material viscosity 1‑100cP, select propulsion type or turbine blade, power reference 1‑7.5 kW;Medium viscosity material 100‑5000cP, suitable for turbine and propeller blades, power range 3‑22 kW;High viscosity material 5000‑50000cP, anchor type and paddle type structure, power reference 7.5‑55 kW;Ultra-high viscosity materials ≥50000cP, recommended ribbon, compound blade, power reference 22‑160 kW.Here we need to focus on attention, Stirring equipment start-up power is usually 1.5‑3 times the operating power, The blade will be restrained by the static friction force of the material under the condition of high viscosity medium, Motor selection can not only refer to the smooth running power, Verification must be completed according to starting power, Avoid motor damage caused by excessive starting current.
Baoji Titanium ValleyTitanium non-standard equipmentManufacturers 'past landing projects, share several groups of practical operation reference cases.The first example is a low-viscosity aqueous solution with propulsion blades, The medium is dilute sulfuric acid at 60℃, DN2000 tank with D600mm propeller and 5.5 kW motor, The equipment has been put into operation for many years and the working condition is stable.Example 2 Medium Viscosity Polymer Solution Conditions, Material viscosity 3000cP, Propulsive blades were incorrectly selected in the early stage, Adapted blades shall be of the paddle or anchor type, 7.5 kW Motor under load for a long time, After several months of operation, the motor is damaged, The adjustment scheme replaces the propeller blade with a 15 kW motor, and the equipment runs smoothly.The third example of high viscosity resin material viscosity 30000cP, DN2500 tank with anchor blades, 22 kW motor, equipment running stable.The fourth case is insufficient power reserve for medium viscosity conditions, Select 11 kW motor, The power margin is only 5%, Motor damage during equipment startup, Replacing the 15 kW motor, Reserve sufficient margin and return to normal.In the fifth example, the magnetic stirring structure was selected under the condition of viscosity 3000cP, Insufficient torque matching, transmission slip, Short-term equipment failure, Adjusted to mechanically sealed construction with 18.5 kW motor, Subsequent long-term stable operation.
intitanium stirrerThere are five common problems that need to be avoided when project design is implemented.The first type of error is the use of propeller blades for high viscosity conditions, Propeller is still selected for material viscosity ≥5000cP, There will be insufficient power, Material mixing is not uniform, High viscosity scenario priority anchor, ribbon bladeThe second type of error is less power reserve margin, Power headroom ≤ 10%, Equipment start-up link is easy to damage the motor, The power margin recommended by the project shall not be less than 20%.The third type of misunderstanding neglects the starting power, Motor type selection only accounts for stable running power, Ignoring the starting shock load, It is suggested to calculate the starting conditions according to the reference of twice the operating powerThe fourth type of error magnetic stirring torque matching insufficient, High viscosity working conditions directly select magnetic stirrer, Drive slip occurs, The selection torque of magnetic stirring needs to be more than 1.5 times the actual torqueThe fifth type of error is that the blade diameter is too large, D/T ratio greater than or equal to 0.7, It will cause a significant increase in equipment power, and create eddy currents., D/T suggests maintaining a reasonable range of 0.3‑0.6.
As Baoji LocalTitanium non-standard equipmentmanufacturers, Shaanxi Qianyi Tuoda Technology Co., Ltd. can provide supporting technical support for chemical enterprises, Can assist customers to complete the mixer power accounting, Customer provides medium viscosity, can-body diameter, rotate speed, Blade type and other parameters, You can give a complete power accounting reference schemeEnterprises often have multiple specificationstitanium stirrerRelated components, covering multi-power stage propulsion, turbine, propeller, anchor, ribbon blades, while providingtitanium stirrerSelection reference materials, relying on a large number of project cases, output blades, power, sealing set of supporting reference programs.Technical friends can call the consultation telephone: 15909236031 / 0917‑3557966, official website:www.sxqytd.com。
Combing againtitanium stirrerthe pow calculation comprises that follow five steps: firstly, selecting a blade according to the viscosity of a medium;secondly, determining the stirring speed;third, controlling the blade diameter D/T ratio of 0.3‑0.6;Step 4: Apply the power formula P=Np·ρ·N³·D and superimpose 1.2 times the margin;The fifth step is to complete the torque and start condition check.Improper matching of power parameters will bring various project risks such as motor damage, shutdown and production suspension.The content of this article is prepared with reference to HG/T 20569‑2013, JB/T 4725‑2015 and other industry open standards, updated on 2026‑08‑08.
disclaimer, Calculation of agitator power in this paper, Formula application content for technical reference only, Results are influenced by the viscosity of the medium, rotate speed, Field condition multiple conditions influence, practicaltitanium stirrerThe type selection scheme shall be subject to the written confirmation of both parties, and the power value shall be estimated under typical working conditions.
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