【Daily Question】June 15 – Issue related to the overspeed test of centrifugal blower impellers (first 80 participants get +2 points; an additional 3–8 points for correct answers...)
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This post was last edited by whthday on 2015-6-17 at 11:07. The Machinery Section has introduced the \"Question of the Day\" feature, which not only helps to foster an active atmosphere for technical discussions and guide the direction of such exchanges but also provides users with financial rewards, enabling them to experience various cool features. 【Daily Question】 In the overspeed test of impellers for general-purpose centrifugal blowers, motor-driven blowers should be tested at ( ) of 100% speed. A. 110% ； B. 111% ； C. 112% ； D. 115% Answer: C Requirements and hints for answering the question: Reply with the answer you think is correct; if you provide a detailed explanation or analysis of the question or answer, an additional reward will be given. You will receive extra compensation if your answer is correct and your explanation is thorough and accurate. Feel free to answer the questions. Please note: We will close this post after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation. Please do not answer the question repeatedly. As a reward for your effort, if you post a topic in this section within two days that provides a detailed explanation of the knowledge points related to this question, please reply or leave a comment in this post to let us know; we will then ask a moderator to award you + charm points. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights. After registration, we will rank based on the content of the posts: the last-place contestant will receive +1 charm, the second-to-last +2 charm, and so on, with the highest score getting +5 charm. Call for weekly topics and daily questions (prizes for participation) [Mechanical Section] Collection of essential knowledge [Seeking manufacturer sponsorship] (long-term campaign) [Rewards for recommending valuable content] Summary of daily questions and answers related to mechanical equipment for 2015
According to JB/T 7258-2006 General-purpose centrifugal blowers, select C. 112%
D. For welded impellers, after completing the dynamic balancing test on a single impeller, it is necessary to operate it at 115% of the maximum continuous operating speed for a duration of 1 to 5 minutes. After overspeeding, two inspections are carried out: one is to check the deformation of the mouth ring, and the other is to check whether cracks have formed in the welds as a result of the excessive rotation. Its purpose is to examine the strength and stiffness of the impeller.
In the overspeed test of general-purpose centrifugal blower impellers, motor-driven blowers shall be tested at 100% of the rated speed (D). A. 110% ； B. 111% ； C. 112% ； D. 115%
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In the overspeed test of general-purpose centrifugal blower impellers, motor-driven blowers shall be tested at 100% of the rated speed (A). A. 110% ； B. 111% ； C. 112% ； D. 115%
In the overspeed test of general-purpose centrifugal blower impellers, motor-driven blowers shall be tested at 100% of the rated speed (D). A. 110% ； B. 111% ； C. 112% ； D. 115%