What is the working principle of the diaphragm pump ?

  • Monday, 25 June 2018

The working principle of the diaphragm pump is equipped with a diaphragm in the two symmetrical working chambers of the pump, which are connected by a central link. The compressed air enters the air distribution valve from the air inlet of the pump, and the compressed air is introduced into one of the chambers through the air distribution mechanism, and the diaphragm in the chamber is moved while the air in the other chamber is exhausted. Once the end of the stroke is reached, the valve train automatically introduces compressed air into the other working chamber and pushes the diaphragm in the opposite direction, so that the two diaphragms continuously reciprocate in synchronism. In the figure, the compressed air enters the air distribution valve and moves the diaphragm to the right. Then the suction force of the chamber causes the medium to flow in from the inlet, pushing the ball valve into the chamber, and the ball valve is closed due to inhalation; the medium in the chamber is squeezed. Push the ball valve out from the outlet, and at the same time lock the ball valve, prevent flow, so that the medium is continuously reciprocated so that the medium is continuously sucked from the inlet and discharged at the outlet.
The diaphragm pump is driven by compressed air. Directional air distribution valves and pilot valves, called “air chambers”, are located in the center of the pump. The medium flows through the two manifolds and the outer diaphragm chamber, called the "media chamber." Normally check valves (ball or chip type) are located at the top or bottom of each outer diaphragm chamber or share a manifold. The two outer diaphragm chambers are connected by suction and outlet fittings. The pump is self-priming.
In operation, the air distribution valve alternately controls the pressurization of each diaphragm. After each stroke, the valve will automatically change position, so that air can be switched to another diaphragm chamber, so that the two sides of the diaphragm chamber alternately aspiration and pressure delivery stroke, the diaphragm moves in a parallel path, air valve oil-free lubrication requirements This is the preferred mode of operation; clean, dry air improves pump performance even more.
When the medium passes through the diaphragm pump, the check valve opens and closes so that each outer diaphragm chamber is alternately filled and discharged, and the check valve reacts to the pressure difference.
Ball valve check valves can handle media containing small particles, while disc valve check valves can handle media containing soft particles close to the pipe size.
When the air distribution valve allows the compressed air to enter the left diaphragm chamber, the diaphragm is forced outwards to form a pressure-feeding stroke, and the medium in the pressure-feeding portion is forced to leave the left outer diaphragm chamber, the check valve, and the manifold, and then the pump The outlet flow out. The outlet can be top, bottom, or side. When the left diaphragm chamber is pushed out, the diaphragm connecting rod drags the right diaphragm inside and retracts the check valve inward to fill the fluid. After this cycle is completed, the air distribution valve will automatically change the position and switch the air to another. In a diaphragm chamber, the above-mentioned cyclic action is repeated in the reverse direction, that is, both diaphragm chambers will thus exhibit alternating pressure-feeding and liquid-absorbing actions.
The working principle of the diaphragm pump is equipped with a diaphragm in the two symmetrical working chambers of the pump, which are connected by a central link. The compressed air enters the air distribution valve from the air inlet of the pump, and the compressed air is introduced into one of the chambers through the air distribution mechanism, and the diaphragm in the chamber is moved while the air in the other chamber is exhausted. Once the end of the stroke is reached, the valve train automatically introduces compressed air into the other working chamber and pushes the diaphragm in the opposite direction, so that the two diaphragms continuously reciprocate in synchronism. In the figure, the compressed air enters the air distribution valve and moves the diaphragm to the right. Then the suction force of the chamber causes the medium to flow in from the inlet, pushing the ball valve into the chamber, and the ball valve is closed due to inhalation; the medium in the chamber is squeezed. Push the ball valve out from the outlet, and at the same time lock the ball valve, prevent flow, so that the medium is continuously reciprocated so that the medium is continuously sucked from the inlet and discharged at the outlet.
The diaphragm pump is driven by compressed air. Directional air distribution valves and pilot valves, called “air chambers”, are located in the center of the pump. The medium flows through the two manifolds and the outer diaphragm chamber, called the "media chamber." Normally check valves (ball or chip type) are located at the top or bottom of each outer diaphragm chamber or share a manifold. The two outer diaphragm chambers are connected by suction and outlet fittings. The pump is self-priming.
In operation, the air distribution valve alternately controls the pressurization of each diaphragm. After each stroke, the valve will automatically change position, so that air can be switched to another diaphragm chamber, so that the two sides of the diaphragm chamber alternately aspiration and pressure delivery stroke, the diaphragm moves in a parallel path, air valve oil-free lubrication requirements This is the preferred mode of operation; clean, dry air improves pump performance even more.
When the medium passes through the diaphragm pump, the check valve opens and closes so that each outer diaphragm chamber is alternately filled and discharged, and the check valve reacts to the pressure difference.
Ball valve check valves can handle media containing small particles, while disc valve check valves can handle media containing soft particles close to the pipe size.
When the air distribution valve allows the compressed air to enter the left diaphragm chamber, the diaphragm is forced outwards to form a pressure-feeding stroke, and the medium in the pressure-feeding portion is forced to leave the left outer diaphragm chamber, the check valve, and the manifold, and then the pump The outlet flow out. The outlet can be top, bottom, or side. When the left diaphragm chamber is pushed out, the diaphragm connecting rod drags the right diaphragm inside and retracts the check valve inward to fill the fluid. After this cycle is completed, the air distribution valve will automatically change the position and switch the air to another. In a diaphragm chamber, the above-mentioned cyclic action is repeated in the reverse direction, that is, both diaphragm chambers will thus exhibit alternating pressure-feeding and liquid-absorbing actions.
Pneumatic diaphragm pump is a new type of conveying machine, which uses compressed air as the power source. For all kinds of corrosive liquids, liquids with particles, high viscosity, volatile, flammable, highly toxic liquids, all can be pumped out. At present, the production has been formed and the product quality has been well received. The main feature of this type of pump is that it does not need to draw water, it can pump liquids, but also can transport some medium that is easy to flow. The suction range is high, the head can be adjusted (0-50 meters), and the air source pressure must be greater than 1kg. Cm2 can work, absolute fire and explosion protection, with submersible pumps, self-priming pumps, impurity pumps, shielded pumps, mud pumps and all the features of the transport machinery many features.
Features
Pneumatic diaphragm pump is a volumetric pump that changes volume due to reciprocating deformation of the diaphragm. Its working principle is similar to the plunger pump. Due to the working principle of the pneumatic diaphragm pump, the pneumatic diaphragm pump has the following features:
(1) The pump will not be overheated: the compressed air acts as a power source and is a process of expansion and heat absorption during exhaust. When the pneumatic pump is operating, the temperature is reduced and no harmful gas is discharged.
(2) No spark generation: Pneumatic diaphragm pumps do not use electric power, and they prevent static sparks after they are grounded. (3) Liquids that can contain granules: Because of volumetric work and the inlet is a ball valve, it is not easily blocked.
(4) Extremely low shearing force on the material: how to suck in when working, how to spit it out, so that the agitation of the material is minimal and it is suitable for the transport of unstable substances. (5) The flow rate can be adjusted. A throttling valve can be installed at the material outlet to regulate the flow.
(6) Self-priming function.
(7) It can be run without danger.
(8) Can work in diving.