What is the effect of increasing the speed of a sliding vane pump?
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The company has two dimethyl ether sliding vane pumps with a capacity of 5.5 KW, operating at 780 rpm and producing 15 m3/h of flow. Previously, belt drives were used for these pumps; however, since the inspections showed that the existing setup did not meet the specifications, it is planned to replace the motors with 6-stage motors connected via couplings, which will result in an operating speed of 950 rpm. What impact will this increased speed have on the pumps? The effects on flow rate and head can be ignored, and there will be no impact on the manufacturing process. What we are mainly interested in knowing is the effect on the pumps themselves
The key issue is that it accelerates the wear and damage of moving parts
It accelerates the wear and damage of moving parts
It accelerated the damage to the composite material slides, and the damaged slides caused the eccentric sleeves made of ductile iron inside the housing to crack and become unusable.
@Deceiving oneself_T11Qk He specializes in slide vane pumps; you can consult him
Hello, the sliding vane pump you are currently using is likely a liquefied gas pump produced in Zibo; it operates via belt drive, which is not particularly safe. Since the rotation speed is 780 revolutions per minute, if a coupling drive is used, it is recommended to switch to an 8-stage motor – this will meet the current operating requirements without exceeding the pump’s specified parameters. It is also possible to use a 6-stage motor; this will increase the flow rate, but the pump’s service life will be slightly shorter compared to when using the current rotation speed, though this will not affect the overall lifespan of the pump. The pump’s sliding vanes, eccentric sleeves, wear-resistant covers, and mechanical seals also fall under the category of wear-prone components, and these can all be replaced later on
You said that upon inspection it was found to not meet the standards. I’d like to ask: is it considered standard to change the motor speed and connection methods arbitrarily like this?
When the speed increases, you also need to consider the issue of net positive suction head.