A Comprehensive Overview of Direct Water Pumps

Posted on Jan 11, 2021

Direct Water Pump

A direct water pump, also known as the DC powered water pumps, is a kind of motorized water pump that utilizes a DC motor, meaning that it is powered by direct current (DC) voltage. Direct water pumps utilize the direct current from motors, batteries or solar power to transport fluid.

What is a Direct Water Pump?

Every household needs a constant supply of water, and when it is cut off for whatever reason in the area you live in, you have got to do something. One of the most common solutions is to install submersible water pumps for both industrial and home use. 

A direct water pump, also known as the DC powered water pumps, is a kind of motorized water pump that utilizes a DC motor, meaning that it is powered by direct current (DC) voltage. Direct water pumps utilize the direct current from motors, batteries or solar power to transport fluid. DC motorized water pumps are generally able to operate on 6, 12, 24, or 32 volts of DC power. Another kind of DC water pump that is powered by solar power utilizes photovoltaic (PV) panels with solar cells that generate direct current when exposed under sunlight.  

Types of Water Pumps that Use DC Motors

DC water pumps come in various types and designs, with each characterized by its advantages, preferred applications, etc. The most common type is the centrifugal pumps in the industries that utilize an impeller to accelerate water. There are three basic types of centrifugal pumps that are powered by DC motors: the axial flow water pump, mixed flow water pump, and radial flow water pump, each of which is defined by the distinct level of fluid flow and pressure.

The specialty water pumps are also another key category that are paired with DC motors. Some of the common types of special water pumps include jet pumps, cantilever pumps, and turbine pumps. Cantilever pumps are typically used for sump pump applications; jet pumps utilize an ejector to achieve the Venturi effect that moves fluid to create pumping pressure; turbine pumps are a kind of centrifugal pump that incorporate a rotary mechanism to transfer fluid by using many small impellers. 

Other types of water pumps that use DC motors include the rotary pumps, reciprocating pumps, displacement pumps and so on. Rotary pumps use a rotary mechanism to draw liquid in and out of spaces as the pump spins in circular motion. Typical examples of rotary DC pumps include gear pumps, progressing cavity pumps, rotary lobe pumps, screw pumps, etc. On the other hand, reciprocating pumps utilize a linear motion instead of rotary motion to transfer fluid. A piston or diaphragm is usually involved to draw fluid in and force it out, which then uses a check valve to control the flow of fluid in the system. Common types of reciprocating DC pumps include bladder pumps, diaphragm pumps, double diaphragm pumps, triplex pumps, peristatic pumps, etc. 

The DC Motor

The smaller kinds of water pumps, such as the ones used in households, typically have smaller DC motors. The DC motor is usually placed inside a sealed case attached to the impeller, and is driven by the impeller through a simple gear drive. You’ll notice that the center of the DC motor is wrapped up by coils, which are essentially magnets that generate a permanent magnetic field that flows through the rotor. When powering on the DC motor, the electricity will run through the coils, creating a magnetic field that repels the magnets surrounding the rotor, allowing the rotor to spin around 180 degrees. As the rotor starts to spin, the electricity in the coils move in a way that pushes the rotor again, enabling it to spin the rest of the way around. The rotor will continue to spin after several more pushes, which powers the impeller as well as the water pump.

The Impeller

Following the above, the impeller of a direct water pump is basically a bladed structure that spins very rapidly. The curved blades draw water into the center of the impeller (sometimes referred to as the “eye”), allowing the current of water to travel to the outside of the blades. Because of the impeller’s rapid movement, the outside of the blades is compressed by water from the centrifugal force, which causes the water to jet forward at a very high speed out of the impeller. The water is pushed through the pipe as the speed generates pressure strong enough on the outlet side of the pump.  

DC Motor vs AC Motor

A question commonly posed is how a DC motor performs as opposed to an AC motor. As a matter of fact, both have their advantages and drawbacks. The key benefit of water pumps powered by DC is that DC water pumps can be driven directly from a battery, which makes them the more portable and convenient choice. DC water pumps are also easier to use and control, unlike AC water pumps, which normally require a dedicated controller to manage the speeds. Moreover, DC water pumps are typically more efficient as well. AC water pumps do however prevail in certain aspects, for instance, AC water pumps excel at higher speeds operations where larger bursts of power are required. They are also said to have superior longevity compared to DC water pumps. 

:: Read more: Direct Water Pumps Make Benefits for Water Transmission

The Benefits of Direct Water Pumps

Some of the advantages of water pumps using DC motors include:

1. Safety:

DC water pumps are very safe to operate. You will never have to worry about being electrically shocked even when they are submerged in the water. If safety is your primary concern when choosing a water pump, you will not be disappointed with a DC water pump.

2. Easy Installation:

You no longer have to use an electric grid to power your DC water pump. You can simply utilize the existing power source on your water pump. And this in turn makes the installation of direct water pumps extremely flexible, and it can be retrofitted with other equipment easily.

3. High Efficiency:

Although you may be paying more for a DC water pump as opposed to an AC water pump, the superb efficiency is impeccable. DC water pumps are designed for optimal energy saving, meaning that they will eventually become more economical in the long run. 

Other advantages of direct water pumps include the fact that they are more quiet (especially if you have a submersible pump) and have longer lifespan. DC water pumps are generally made with pure copper coils which allow them to achieve competitive advantage in the market pertaining to durability, hence the longer lifespan. 

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