The connection methods of motor and pump, direct shaft connection and belt connection, comparison of these two connection methods
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For the pumps I have come into contact with so far, there are generally two ways of connecting the motor and the pump, direct connection through a shaft or connection with a belt. So what are the advantages of these two connection methods? I think one advantage of the belt connection is that the pump speed can be adjusted to a certain extent by changing the size of the pulley. In addition, the belt connection can install the motor above the pump, saving floor space. If you have any relevant information and experience, please share it.
This still needs to follow the original design. The belt is easily broken if it is lost, and it is not related to a high-speed secondary motor. Most of them are driven coaxially or through couplings. There are not many applications for belt drives, and they may be suitable for agricultural irrigation.
There are both connection methods, which are related to the applicable location, investment cost and other factors. Generally, the motor connection is more common, and the belt is easy to wear and break.
There are many motor connections, and most industrial pumps use this method!
Most motors are directly connected to the pump, and those connected by belts can be variable speed and locked-rotor protected. It’s hard to say whether it saves space or not. Vertical directly connected pumps also save space.
The pump speed of many chemical companies is too high to be driven by a belt. Even if it is driven, the belt will break soon.
The shaft connection has low noise, and the belt is prone to static electricity. When the load of the belt connection is large, it can slip and unload part of the load, but it is also prone to fire hazards due to friction and overheating.
The belt efficiency is low, suitable for low speeds, the alignment requirements are not strict, and the installation takes up space; the opposite is true for direct connection!
Each has pros and cons. Each has its own benefits and disadvantages.
Belts are generally connected with low speed, small load, easy to slip, and low efficiency. They are rarely used in general chemical equipment.
Belt drive is suitable for working conditions with large flow, low head and low speed, such as agricultural irrigation and axial flow circulating pumps. Belt transmission efficiency is low. The only advantage is that it is not easy to burn out the motor when the equipment is overloaded (the belt breaks first) ； Generally, industrial pumps are directly connected to the motor. Direct-coupled pumps can meet various working conditions, especially high-lift pumps, which are incomparable to belt drives. Direct-coupled drive pumps have high efficiency and low energy consumption. The relevant parameters of the pump can be adjusted through frequency conversion. Direct-coupled drive is currently the most common connection method.