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Matching Method of Variable Rotation Speed ​​of Second Stage Impeller with Two Stage Impellers of Contra-Cyclone Fan

A matching method, cyclone technology, applied in mechanical equipment, non-variable capacity pumps, machines/engines, etc., can solve the overload of the second stage motor, the pressure rise and power rise of the second stage impeller too fast, the second stage Impeller pressure rise and efficiency drop too fast, etc., to reduce the load, expand the blocking condition margin, and expand the efficient working range.

Active Publication Date: 2017-10-31
SANMING UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the flow rate is small, the pressure rise and power of the second-stage impeller rise too fast with the flow rate, which leads to the overload of the second-stage motor; when the flow rate is large, the pressure rise and efficiency of the second-stage impeller increase with the flow rate fall too fast

Method used

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  • Matching Method of Variable Rotation Speed ​​of Second Stage Impeller with Two Stage Impellers of Contra-Cyclone Fan
  • Matching Method of Variable Rotation Speed ​​of Second Stage Impeller with Two Stage Impellers of Contra-Cyclone Fan
  • Matching Method of Variable Rotation Speed ​​of Second Stage Impeller with Two Stage Impellers of Contra-Cyclone Fan

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Embodiment Construction

[0019] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, a method for matching the variable speed of the second-stage impeller with equal power to the two-stage impeller of the counter-cyclone fan according to the present invention includes the following steps,

[0021] S1: Real-time measurement of the input power N1 and N2 of the first-stage impeller motor and the second-stage impeller motor; among them, the input power of the first-stage impeller motor and the second-stage impeller motor is measured by the first power sensor and the second power sensor respectively ;

[0022] S2: Calculate the power difference between the two impellers

[0023] S3: If the power difference △N of the two-stage impellers is within the error limit, that is, when -εε, increase the speed of the second-stage impeller ; If ΔN<-ε, then reduce the speed of the second-stage impelle...

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Abstract

The invention relates to an equipower second-stage impeller variable rotational speed matching method for two stages of impellers of a contra-rotating fan. According to the method, firstly, the input power N1 of a first-stage impeller motor and the input power N2 of a second-stage impeller motor are measured in real time; secondly, the power difference of the two stages of impellers is calculated according to the formula that delta N=(N1-N2) / N1; thirdly, if the power difference delta N of the two stages of impellers is within the error limit range, namely -epsilon<delta N<epsilon, the rotation speed of the second-stage impeller keeps unchanged; if delta N>epsilon, the rotation speed of the second-stage impeller is increased; if delta N<-epsilon, the rotation speed of the second-stage impeller is reduced, and epsilon is the given error limit; and finally, equipower second-stage impeller variable rotational speed matching for the two stages of impellers of the contra-rotating fan is completed, and the power of the two stages of impellers is made to be equal under any work conditions. The equipower second-stage impeller variable rotational speed matching method for the two stages of impellers of the contra-rotating fan can improve the performance of the second-stage impeller, improve the pressure rise and efficiency of the large-flow work condition fan, widen the high-efficiency work range and blocking work condition margin of the contra-rotating fan and reduce the load of the second-stage impeller under a small-flow work condition, thereby avoiding the phenomenon that the second-stage motor is overloaded and burnt out.

Description

technical field [0001] The invention relates to a method for matching the variable speed of the second-stage impeller with equal power to the two-stage impeller of a counter-cyclone blower. Background technique [0002] Counter-rotating fans are widely used in tunnels, mines, aviation and other fields. In the design working condition, the counter cyclone fan has the advantages of large flow rate, high pressure rise and high efficiency, and the power and pressure rise characteristics of the two-stage impellers are roughly equal, and the efficiency is also high. However, when the working conditions deviate from the design, the pressure rise, power and efficiency characteristics of the two-stage impellers are quite different, especially the pressure rise, power and efficiency characteristics of the second stage change drastically with the flow rate. The pressure rise and power increase rapidly, and the phenomenon of motor overload and burnout is prone to occur. In the case of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00F04D25/06
CPCF04D25/06F04D27/00
Inventor 艾子健吴龙
Owner SANMING UNIV
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