Impeller nut O-ring wire diameter
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This post was last edited by 3983596_FPPZ on 2018-11-26 at 10:44. During today’s drawing review, it was found that the O-ring used at the nut of one of the pump impellers had a diameter of φ1.8, which was not satisfactory. I approached the designer and convinced him to change it to φ2.65; φ3.55 would be even better. He argued that any size specified in the standards could be used. An O-ring with a diameter of φ1.8 is similar to a wire; even the slightest error can result in an uncontrollable degree of compression, making it impossible to achieve sealing. Taking this as an example, we can draw broader conclusions from it. When carrying out tasks, there are many standards, requirements, and regulations to follow. However, determining under what circumstances which standards should be applied and which rules should be used is a matter of finding the right balance. I believe there is no perfect solution – only what is suitable. The Doctrine of the Mean in The Analects offers the best interpretation of such balance, and it is worth drawing on.
Is there a standard for what size O-ring to use for the impeller nut? Please share it
How wide and deep is the O-ring groove? :o
\"GB/T3452.1 O-rings for hydraulic and pneumatic applications\": For the same diameter, there can be multiple wire diameters; if the structural dimensions permit, it is better to use a thicker one.
The O-ring groove has a deep depth, and the groove width is standard
Well, I know that, but when it comes to design, deciding on the exact size of the O-ring is a matter of personal judgment
There are three standard specifications for O-rings that I am familiar with. One is GB3452.1, which is the most widely used standard; its measurement is based on the inner diameter. Another is GB1235, whose measurement is based on the outer diameter, and this standard is not very common. The third one is JB7757.2, a standard for mechanical seals; it also uses the inner diameter as the measurement parameter, and there are many different wire diameter options available, offering plenty of choices
Thank you; the moderator’s ability to compile information is truly outstanding:victory: