The Working Principle of Diaphragm Pump - Suction and Discharge Principle
Feb,08,2025
CONTENT [HIDE]
01. Working Principle of Diaphragm Pump
02. Experimental Study on the Working Principle of Diaphragm Pump Suction and Discharge
03. Working Principle Video of Diaphragm Pump
Working Principle of Diaphragm Pump
Diaphragm pumps rely on the reciprocating mechanism of the diaphragm to suck in and push liquid, using compressed air or an electric motor as the driving force to make the diaphragm work.
The diaphragm pump consists of two diaphragms on the left and right sides. When the left diaphragm contracts and generates force to suck liquid into the left chamber, the right diaphragm immediately expands, generating force to push the liquid out and back. Generate a force to suck the liquid into the right chamber, and the left pump diaphragm will generate a force to push the liquid.
The ball and seat will act as one-way valves, keeping the liquid in the pump chamber and allowing the liquid to be discharged only in one direction. The two pump diaphragms will move in the same direction and run continuously, regularly, and relative to each other through the connecting shaft, thereby helping to ensure uninterrupted delivery.
GODO diaphragm pumps are suitable for most high viscosity liquids (up to 10000 CPS).
To better understand the working principle of diaphragm pumps, please conduct a small experiment with GODO to see how diaphragm pumps work.
Experimental Study on the Working Principle of Diaphragm Pump Suction and Discharge
Syringe is essentially the basic form of diaphragm pump. It can be seen that diaphragm pumps are widely used in daily life.
When the piston is pulled (as shown in Figure 1), fluid is pulled into the cylinder. When the piston is pushed forward, fluid is discharged through the needle valve at the cylinder head. In this case, the liquid enters and exits from the same point using a syringe.
But let's consider scenario 2, which is an example with separate entry and exit points.
In Figure 2, when the piston is pulled out, no liquid is sucked in, only air is sucked in from the top of the cylinder, and no liquid is pulled up. Now, we will place a spherical check valve (spherical ball) on the hole where air enters in Figure 2. Then, as shown in Figure 3, the air no longer flows in, and pressure is generated inside the cylinder, causing the liquid to be sucked upwards.
If the one-way valve (ball) is light, it may discharge a small amount of fluid, but most of it will return to the fuel tank.
If the one-way valve (ball) is quite heavy, all the water sucked in will return to the water tank.
Next, let's press the piston. (Figure 4)
If the one-way valve (ball) is light, it may discharge a small amount of fluid, but most of it will return to the fuel tank.
If the one-way valve (ball) is quite heavy, all the water sucked in will return to the water tank.
Now, we will place another check valve at the bottom of the cylinder to prevent backflow.
At this point, due to the action of the lower check valve, the liquid inside the cylinder will not flow back to the tank, as shown in Figure 5, but will be pushed upwards by the upper check valve to flow out.
When the piston moves outward, once the upper one-way valve closes and the lower one-way valve opens, fluid is drawn into the cylinder. Note that there is no backflow above at this time. (Figure 6)
As shown in the figure, the function of a check valve is to move the fluid in one direction, which is the main function required for a diaphragm pump.
View now: Air Operated Diaphragm Pump (AOD Pump) Pneumatic Diaphragm Pump
Working Principle Video of Diaphragm Pump
Video: How Pneumatic Diaphragm Pump Works?
The above is the working principle of suction and discharge of diaphragm pumps, hoping to help you better understand diaphragm pumps.
If you want to choose truly high-quality diaphragm pumps at competitive prices. Please contact GODO immediately for the fastest support! GODO is always ready to listen and support you.
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