What is the difference between a magnetic drive pump and a diaphragm pump?

I believe many users have difficulty choosing between a magnetic drive pump and a diaphragm pump. In the final analusis, it is caused by an unclear understading of the differences, advantages and disadvantages between. In this regard, we Vector Magnets analyzes on the differences between magnetic drive pumps and diaphragm pumps. 

1. Difference

The difference between magnetic drive pumps and diaphragm pumps is reflected in all aspects, such as working principle, transportation characteristics, pump manufacturing cost, structural design, performance parameters, etc., mainly reflected in:

1. The driving modes of the two are different. The magnetic drive pump is magnetically driven, while the diaphragm pump has two modes: electric and pneumatic. At present, pneumatic drive is the mainstream.

2. The flow rate of the magnetic drive pump is small, the operation is smooth, and there is no pulse. The diaphragm pump has a larger flow rate, which can reach 60 cubic meters/hour. The magnetic drive pump has a slight shear on the material, while the diaphragm pump has no shear, but there is an obvious pulse at the outlet.

2. Product features

Next, we will introduce the characteristics of the two pump products: magnetic drive pump and diaphragm pump:

Diaphragm pumps: Mainly pneumatic pumps, which can also be equipped with motors to improve performance. Compared with magnetic drive pumps, the internal structure design is simpler, so it has a lower failure rate. Its performance parameters and leakage prevention level are weaker than those of magnetic drive pumps. However, both the durability and ease of use of the equipment are much higher. Compared with magnetic drive pumps, which require frequent attention to operating parameters, diaphragm pumps have reassuring automatic protection functions. In the event of medium flow interruption, overload operation, blockage, etc. Under unexpected working conditions, the pump body is rarely damaged, and it has better medium adaptability than magnetic drivepumps.

Magnetic drive pump: It is composed of a centrifugal pump body and a magnetic coupler. It is significantly different from the motion trajectory of a transfer motor water pump. It uses magnetism to complete kinetic energy transfer without producing mechanical friction, so it has a higher service life and superior safety. , which can effectively prevent medium leakage. Its performance parameters are slightly lower than centrifugal pumps of the same caliber, but higher than pneumatic diaphragm pumps. It has weak adaptability to media and mainly transports pure water media, including corrosive liquids.

3. Advantages and Disadvantages

1.Diaphragm pump

Advantages:

①Can be used to transport fluids with relatively unstable chemical properties.

② In the processing of hazardous and corrosive materials, the diaphragm pump can completely isolate the materials from the outside world.

③The diaphragm pump is small and easy to move, does not require a foundation, occupies a very small area, is easy and economical to install, and can be used as a mobile material transfer pump.

2. Disadvantages:

①The outlet pressure cannot exceed 8.4 kg.

② There is a pulse at the outlet.

③The flow rate is between 1 and 60 tons, which is smaller than traditional pumps.

④ The medium is prone to precipitation and crystallization during transportation. In this case, it is necessary to clean up and drain the liquid in the pump in time.

2.Magnetic drive pump

Advantages:

1. Since the transmission shaft of the magnetic drive pump does not need to penetrate the pump casing, it uses the magnetic drive field to drive the internal magnetic rotor through the magnetic field and the thin-walled isolation sleeve to drive the internal magnetic rotor. Therefore, the leakage channel of the shaft seal is fundamentally eliminated and complete sealing is achieved.

2. The magnetic drive pump has overload protection when transmitting power.

3. In addition to the high requirements on the magnetic materials and magnetic circuit design of the magnetic drive pump, the other technical requirements are not high.

4. The maintenance and repair workload of the magnetic drive pump is small.

Disadvantages:

1. High alignment requirements.

2. If the inlet material is not clean, it is easy to wear the inner magnetic cylinder and isolation sleeve.

3. The material requirements for the isolation sleeve of the magnetic drive pump are relatively high.

4. The magnetic drive pump is not allowed to run dry without material.

5. The efficiency of magnetic drive pump is lower than that of ordinary centrifugal pump.

6. The price is relatively expensive.

7. Limitations on the scope of use: The magnetic drive pump has requirements on the operating environment temperature, motor temperature, maximum working pressure, medium density and particle size of the pump in the working environment.

8. After long-term use, even if the mechanical parts are not damaged, it may still be unable to be used due to the weakening of the magnetic force.