Miniature vacuum pump I want to use for indirect pumping, how to choose the type?

Now many do medical equipment, are faced with the solution of bedridden patients urinate after the urine transfer collection problem. In the research and development, there are two options: one is to choose a miniature water pump | miniature self-priming pump | miniature pumping pump directly to the urine transfer to the collection of bottles, the second option is to choose a miniature vacuum pump | miniature air pump | miniature negative pressure pumps, so that the vacuum pump to the closed urine collection bottle vacuum, from the collection of bottles on the introduction of tubing to connect to the patient's urine bag indirectly pumping liquid.

Tests have found that the efficiency of indirect pumping is particularly high, and power consumption is extraordinarily low. Specifically as follows:

Micro-vacuum pump model: PM6503-12V, the pump is connected to the following figure, for indirect pumping test. Micro vacuum pump | micro air pump, high vacuum VBH series, VCH series, can also be used for indirect pumping.

After the pump is energized, water starts to flow into the sealed container in hose A. When it reaches 550ml, the time required is 17 seconds, which translates into a pumping speed of about 1.9L/min, and the power consumption of this pump is about 1.2w (12V DC, load current <100mA). If the direct pumping, we choose WKA1300-24V miniature vacuum pump | miniature self-priming pump, power consumption of about 3.4w (24V DC, load current ＜140mA), while the pumping speed of 1.3L/min.

This is not WKA1300 miniature pump power consumption, but by the program decision. If you are pumping water directly, you may not be able to find a pump with a power consumption of 1.2w and a pumping speed of 1.9L/min.

"Indirect pumping" has several advantages:

1. Low power consumption, small size, portable, easy to store; especially suitable for limited battery life of mobile or portable occasions (such as lithium batteries or battery-powered): such as field life-saving, disaster relief, portable tools, travel and so on;

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2. Low noise, for medical and health care, especially the need for mute occasions, such as the above patient transfer of urine, it is difficult to imagine, with a very noisy pump, the patient and the entire ward and even the entire medical district can tolerate;

3. You can avoid the pump pumping directly when the pumping may be pumped to the particles, resulting in the possibility of malfunction (the air pump as a result of the use of buffer bottles, liquids can only enter the buffer bottle, generally will not enter the pump). bottle, and generally will not enter the pump to cause damage.)

These technical articles I have seen on the blog of Chengdu Xinwei Cheng Technology Co., Ltd. are very detailed, to give you a URL: /u/1265010387