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Baseline Pressure

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rkreidler3

Mechanical
Jul 21, 2022
3
Hello,
I am new here and working with pumps for the first time. We are currently working on a consumer goods product that utilizes a small d/c diaphragm motor for applying a vacuum. Right now, between cycles, the solenoid valve returns pressure to 0 between each cycle. I am wondering if anyone has tried maintaining a baseline pressure, where you would drop the vacuum to between -50 and -75mmHg instead of 0, and then resume another vacuum cycle.
Any tips on how to achieve this would be appreciated. Keep in mind it is a price conscious product, so very expensive pressure switches might be too far out of the scope. I am hoping it can be achieved by a simple motor sensor and/or by just closing the valve quicker, but maybe that's too naïve, not sure.
 
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You really need to sketch this out a little bit more. If the pump is direct coupled to the device and you don't have room for a non return valve then it's difficult to see how the reduced pressure can be maintained.

I'm assuming this is basically like a suction cup being pulled by a solenoid?

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20220725_151140_syegtw.jpg


I attached a rough sketch. I'm assuming the motor (m) is creating the suction which is applied through the tube (t) to a suction cup that is out of frame. Then the solenoid (s) is opened and releases the pressure. I'm wondering if the pcb could just be programmed to close the valve quicker so it doesn't return vacuum to 0. If that's impossible, is there another components I could look into that would help maintain that baseline pressure. This is all new territory for me so just trying to get my bearings and find a few leads.
 
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