DC water pump

The dc water pump is a machine for conveying or pressurizing liquid. When the dc water pump works, the coil and commutator rotate, the magnetic steel and carbon brush do not rotate, and the alternating change of coil current direction is completed with the commutator and brush of the motor. The dc water pump adopts the water pump powered by DC power supply, and the commonly used voltages are 3V, 6V, 12V, 24V, 36V, 48V, etc,DC water pumps are divided into: brushed DC water pump and brushless DC water pump.

DC brushless water pump refers to a machine that uses direct current of 4.5V-48V to drive a brushless motor, which drives the impeller to rotate, thereby increasing the liquid pressure and achieving the effect of liquid transmission.

Small dc water pumps are widely used in new energy vehicles, intelligent toilets, water heaters, chillers, water heating mattresses, air conditioning drainage, coffee machines, humidifiers, washing machines and other household appliances.

All standard DC water pump by SHENPENG with lower price you will find here:

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R & D, design and production of DC water pump

Guangdong Shenpeng Technology Co., Ltd. was found in 2012 and is specialized in brush-less DC water pumps. As a global BLDC water pump solutions specialist, it integrates R&D, manufacture with sales.The products are mainly applied to New-energy vehicle, mattress, home appliance (water heater, dish washer, coffee machine, water dispenser), smart toilet, cosmetic/medical equipment, machine tool equipment, air conditioning base station, PC, LED cooling system etc.

Shenpeng was the earliest company that managed to produce the brushless DC water pumps. It is located in Changping, Dongguan and covers an area of 12000㎡. With an in-house CNAS standard laboratory, 300-thousand-grade dust-free workshop and 10 professional production lines. The annual production capacity is more than 5 million sets of water pumps and it is one of the largest manufacturer of BLDC water pump in China. It won many honorable titles such as High-tech Enterprise, Multiplication Enterprise etc.

Working principle of DC water pump？

The working principle of a DC water pump is based on the drive of an electric motor. The main structure of a DC water pump consists of the pump body, motor, and impeller. After the DC water pump is turned on, the impeller rotates at high speed inside the pump body (before the water pump is turned on, the pump body should be filled with liquid). The liquid inside the pump rotates with the impeller. Under the action of centrifugal force, the liquid is ejected by the impeller at the outlet, and the velocity of the ejected liquid gradually slows down in the diffusion chamber of the pump body. After the liquid is ejected, a vacuum low-pressure zone is formed at the center of the impeller, and the liquid flows into the storage tank under the action of atmospheric pressure. The volume of the diffusion chamber of the pump body is fixed. As the amount of liquid being ejected increases, the pressure gradually increases and is eventually discharged from the outlet of the DC water pump. In this way, the liquid is continuously sucked in from the liquid pool and then continuously discharged from the outlet of the DC water pump.

The working principle of a DC water pump mainly includes two aspects: the kinetic energy generated by the rotation of the motor and the hydrodynamic force generated by the rotation of the impeller on the water. Firstly, the rotation of the motor generates kinetic energy, which is the basis for the operation of a DC water pump. After the motor is powered on, the current passes through the coils inside the motor, generating a magnetic field. The magnetic field exerts a force on the iron core inside the motor, causing it to rotate. The rotation speed of the motor can be controlled by adjusting the input power frequency or voltage.

Secondly, the impeller generates hydrodynamic forces due to the rotation of water. The impeller is the core part of a DC water pump, usually made of metal or plastic. The blade shape and angle of the impeller are carefully designed to ensure that water obtains sufficient kinetic energy inside the impeller. When the impeller rotates, water is sucked into the interior of the impeller and gains kinetic energy as the blades rotate. While obtaining kinetic energy, water also receives outward thrust, which overcomes the pressure at the pump outlet and causes water to flow from the pump inlet to the outlet.

Working Principle of Brushless DC water pump?

Brushless DC water pumps use electronic commutation without the need for carbon brushes. The magnet rotor and stator silicon steel sheet both have multi-stage magnetic fields. When the magnet rotor rotates at an angle relative to the stator, it automatically changes the direction of the magnetic pole, keeping the rotor in the same level of repulsion, thus enabling the brushless DC magnetic isolation pump to have higher speed and efficiency.

The motor of the DC brushless water pump motor itself is an electromechanical energy conversion part. In addition to the motor armature and permanent magnet excitation, it also has sensors (also three-phase sensorless). The core of the DC brushless motor itself is the electrified electronic commutation, which overcomes the inherent defects of the brushless DC motor and replaces the mechanical commutator with an electronic commutator, So brushless DC motors not only have the characteristics of good speed regulation performance of DC motors, but also have the advantages of simple AC motor structure, reliable operation without commutation sparks, and easy maintenance. Without commutator and carbon brush wear, mechanical noise is reduced, and the service life of water pumps is prolonged. It not only relates to performance indicators, noise vibration, reliability, and service life, but also involves manufacturing costs and product costs.

Brushless DC motor, also known as DC variable frequency water pump, has the characteristics of a brushless DC motor and is also a frequency changing device. It is commonly known internationally as BLDC brushless DC motor, and its operating efficiency, low speed torque, speed accuracy, and other aspects are better than any control technology's frequency converter.

Application field of DC water pump

DC water pump is widely used in automobile industry, water heater, intelligent toilet, dishwasher, water heating mattress, coffee machine, industrial chiller, laser machine, printer, air conditioning equipment, computer, washing machine, medical and beauty equipment, humidifier, and so on.

Application of DC water pumps in the automotive industry

DC water pump is used for cold starting of automobile engine below minus 40 degrees in winter, circulating heat dissipation of fuel engine at 120 degrees high temperature, and water circulating heat dissipation of new energy vehicles, new energy buses, new energy trucks, electric motorcycles and fuel cells.

Application of DC water pumps in household appliances and bathroom products

DC water pump is used for intelligent toilet, water heater, water heating mattress, computer water cooling system, air conditioning drainage, washing machine, etc. DC brushless water pump has the characteristics of low noise, long service life, small volume, good pressurization and circulation effect, and can fully meet the needs of household appliances and sanitary products.

The application of direct current water pumps in the food industry

DC water pump is mainly used for dishwashers, coffee machines, water dispensers, ice makers, slow cookers, etc. the shell of the water pump can be made of special food grade high temperature resistant materials, and the dc water pump can work normally for more than 24 hours.

Application of DC water pumps in solar photovoltaic energy products

DC water pump solar is to directly drive the water pump with solar panels. 12v dc water pump solar  has three functions: 

(1) energy saving, which is 35% more energy-saving than ordinary DC brush water pump. 

(2) Soft start function, which can be started normally within 1W. 

(3) It is convenient to set the overvoltage protection function.

The Application of DC Water Pump in Mechanical Equipment and Chemical Industry

DC water pump is used for machine tool equipment water circulation heat dissipation, chiller water circulation heat dissipation, laser water circulation heat dissipation, sewage purification and other industries.

How to Choose a DC Water Pump?

There are many kinds of DC water pumps on the market, but not every DC water pump is suitable for you, because different pumps have different working voltage, size, import and export form and direction, different working performance, working environment conditions, etc. Therefore, when you choose the DC pump, you should choose from these aspects.

1. Working voltage of DC water pump

DC water pumps include 3v, 5v, 6v, 12v, 36v, 24v, 48v and other DC water pumps with different rated voltages. The lower the rated voltage, the smaller the corresponding pump performance. If you want to buy pet water pump or desktop fountain water pump, we suggest you choose the water pump with rated voltage of 3-6V. If the DC water pump you need to purchase is installed in household appliances (computers, air conditioners, water heaters, water heating mattresses), and sanitary products (intelligent toilets), we recommend you choose 24v or 12V DC water pumps. If you use it on a vehicle or motorcycle, we recommend that you choose an electric water pump with a rated voltage of 12V or 24V. If you are installed on the chiller for use, we recommend that you choose a DC water pump with a voltage of 24v or 48v.

2. About the head of the DC water pump

The maximum head of the DC pump generally refers to the static head without water flow when pumping water to the maximum head. If it is necessary to dc pump water to a certain height and maintain a certain flow, the required lift must be higher than the specified pumping height. Generally speaking, when selecting the model, it is necessary to increase the head to about 5%~10% of the margin.

3. Flow rate of DC water pump

Flow is one of the important performance data of dc water pump selection, which directly affects the pumping performance of the entire dc pump application system. Therefore, when selecting the DC pump, the maximum flow shall be taken as the basis and the normal flow shall be considered. When there is no maximum flow, 1.1 times of the normal flow can usually be taken as the maximum flow of the DC pump.

4. Working environment of DC water pump

If the environment used by the small DC water pump requires diving, such as in the smart toilet, the DC submersible pump that can be used as the submersible pump must be selected. If the ambient temperature and working fluid temperature you need to use are very high, such as solar water heater, automobile engine heat dissipation, electric vehicle battery heat dissipation and other high water temperature environments, you must choose a small electric DC pump that can withstand high temperatures. For example, the solar water heater should select a water pump with a maximum operating temperature of 100 ℃, and the fuel cell cooling system of new energy vehicles should select an dc water pump with a maximum operating temperature of 180 ℃.

5. Inlet and outlet dimensions and product dimensions of DC water pumps

When you choose a DC water pump for household appliances, sanitary products or water circulation systems, you should choose a dc water pump with an appropriate external size. It is convenient for you to have enough space to install the DC water pump when designing the product. If the remaining space of the pump is very compact, we recommend that you choose a brushless DC pump with higher efficiency and smaller volume instead of a brush DC pump with the same working performance. The direction and shape of the water pump inlet and outlet should also suit the direction and joint form of your piping system. For example, the inlet and outlet directions of dc pumps used on water heaters are usually in-line and threaded. In this case, you should choose 12v, 24v in-line pumps, which have 1/2 ″ or 3/4 ″ threaded inlets and outlets.

How to choose a DC brushless water pump

When customers choose DC brushless water pumps, they must carefully understand the following parameters or provide them to our company.

1) DC brushless water pump specifications and models: Select a good series and specifications.

2) DC brushless water pump power supply method:

A. What is the voltage and current of a variable voltage switching power supply?

B. What is the storage capacity in amperes per hour for battery power supply?

C. What is the open circuit voltage and short circuit current of solar power supply?

3) DC brushless water pump voltage level:

A. 4.5VDC, 6VDC, 9VDC, 12VDC, 15VDC, 24VDC.

B. Voltage at any potential of 4.5VDC-24VDC.

4) DC brushless water pump power size: 0.65-120W.

5) DC brushless water pump static lift and static flow rate:

A.Static lift - refers to the maximum height at which water rises when the water pump is working and there is no water flowing out.

B.Static flow - refers to the horizontal flow rate when the water pump outlet is not connected to any water pipes.

For example, if you want to choose a water pump that flows 3 liters of water at a height of 2 meters, the static lift of this water pump must be greater than 3 meters in order to obtain 3 liters of water at a height of 2 meters (refer to the pump operation VS curve or consult our company's business personnel for details).

6) DC brushless water pump operating environment: environmental temperature, humidity, ventilation status, equipment used, whether diving.

7. DC brushless water pump medium: water, oil, antifreeze, etc., as well as the temperature and pH value of the medium.

8. Selection of DC brushless water pump performance: Choose a water pump that is suitable for oneself, not the larger the better:

A. DC brushless water pump appearance: The appearance design is beautiful and generous, and the manufacturing is excellent.

B. Electrical performance: low vibration, low noise, low starting current, high efficiency, and low temperature rise;

C. Structure: Simple installation and operation, convenient maintenance and warranty

D. Choose professional and legitimate production distributors.

Characteristics of DC brushless water pump

1. DC brushless water pump has a long service life, no maintenance required, small size, high efficiency, low power consumption, strong anti-interference ability, and stable operation.

2. DC brushless water pump has no carbon brush, no pollution, electronic commutation, and long service life.

3. The stator and circuit board of the motor in the DC brushless water pump are sealed with epoxy resin and completely isolated from the rotor, solving the leakage problem caused by long-term diving of the motor type DC water pump. It can be installed underwater and completely waterproof.

4. The DC brushless water pump can adjust the pump parameters according to customer requirements. The 12V and 24V water pumps can adjust the head by 2 meters or 7 meters, with the same volume and can operate at a wide voltage range.

5. The shaft of the DC brushless water pump adopts high-performance ceramic shaft (stainless steel shaft can be selected to reduce costs), which has high accuracy and good wear resistance. Due to the precise combination of high-precision shaft sleeve and ceramic shaft (which can be replaced with other materials to reduce costs), the noise is low, and the noise with lower power can even reach below 25 decibels.

6. The three-phase hall free program driven DC water pump in the DC brushless water pump series can realize PWM speed regulation, analog signal (0~5V) speed regulation, and Potentiometer VR manual speed regulation, so that the flow and head can be adjusted, and Musical fountain can be customized.

7. The three-phase DC water pump in the DC brushless water pump has a soft start, no impact, low startup power consumption, and the circuit board is completely separated from the pump body. There are no electronic components inside the pump body, and the pump body is made of high-temperature resistant materials. The DC water pump can be used in a water temperature of 100 degrees Celsius for a long time. Equipped with impeller rotor jamming protection, reverse connection protection, overload protection, and overcurrent protection.

8. The DC brushless water pump has a variety of interfaces, including 4 threads, 2 threads, 8mm, 10mm, 22mm, 27mm, etc. It can also be customized according to customer requirements.

9. If the head of the DC brushless water pump needs to be increased, the water pump can also be connected in series, and the head can be doubled.

10. The DC brushless water pump can be used for both water and land (when used externally, the installation position is lower than the liquid level)

11. The DC brushless water pump can be customized according to user requirements and its associated control system.

What are the advantages and disadvantages of DC brushless water pumps?

Dc brushless water pump advantages:

1) Electronic commutation replaces traditional mechanical commutation, with reliable performance, no wear (no spark generation), low failure rate, and a lifespan many times longer than that of brush motors (usually capable of continuous operation of over 200000 to 300000 million). Brushless DC water pumps represent the development direction of DC water pumps.

2) Static motor with low no-load current.

3) High efficiency.

4) Small size.

5) Energy saving, environmental protection, and pollution-free.

DC brushless water pump disadvantages:

1) When starting at low speed, there is slight vibration. If the speed increases and the commutation frequency increases, the vibration phenomenon cannot be felt.

2) High price, high controller requirements.

3) Resonance is easy to form because everything has an inherent vibration frequency. If the vibration frequency of a brushless motor is the same or close to the vibration frequency of a frame or plastic component, resonance phenomenon can be easily formed. However, resonance phenomenon can be minimized by adjusting. So it is a normal phenomenon for electric vehicles driven by brushless motors to sometimes emit a buzzing sound.

Precautions for use of DC water pump   

1. There must be no impurities inside the DC water pump and particles must be prevented from entering

(1) Ferromagnetic impurities and particles are not allowed to enter the magnetic driver and bearing friction pair; (2) After transporting the medium that is easy to crystallize or precipitate, wash it in time (fill the pump cavity with clean water after stopping the pump, and drain it after running for 1min) to ensure the service life of the sliding bearing; (3) When conveying medium containing solid particles, filter at the inlet of pump flow pipe.

2. To prevent demagnetization, it is required to operate at the specified temperature, and the medium temperature is strictly prohibited to exceed the standard. Platinum resistance temperature sensor can be installed on the outer surface of the magnetic pump isolation sleeve to detect the temperature rise in the annulus area, so as to alarm or stop the machine when the temperature exceeds the limit.

3. Avoid dry friction and minimize idling time.

4. The pump installed below the liquid level is a centrifugal pump, which cannot automatically exhaust air. It must be submerged or installed below the liquid level when in use.

5. Reduce idling time. Try not to idle the water pump. It is easy to wear because there is no medium lubrication during idling.

6. Do not exceed the rated voltage. The pump must be used at the rated voltage. If there is overpressure or other functional requirements, they should be put forward in advance.

Precautions for installation and use of DC brushless water pumps:

1) When the DC water pump casing is connected to a hard object, a shock absorber pad needs to be installed on the casing or bottom of the DC water pump.

2) The best installation effect is to install the pump body parallel to the horizontal plane at the inlet of the DC water pump.

3) The bending angle of the rubber hose connecting the inlet and outlet of the DC water pump should not be less than 90 degrees as much as possible.

4) The DC water pump can be installed at any angle of 360 degrees, but it is necessary to contact our company's technical department when ordering, so that the DC water pump can be adjusted to its maximum working state when leaving the factory.

5) DC water pumps should be kept away from environments with strong magnetic objects.

6) The DC water pump is not allowed to have ferromagnetic impurities or particles entering the magnetic drive and bearing friction.

7) After transporting media that is prone to crystallization or sedimentation, the DC water pump should be flushed in a timely manner (after stopping the pump, pour clean water into the pump cavity, and discharge it clean after running for 1 minute) to ensure the service life of the DC water pump.

8) When conveying media containing solid particles through a DC water pump, it should be filtered at the inlet of the pump flow pipe.

9) The positive and negative poles of the DC water pump power supply cannot be reversed.

10) When the DC water pump is working, the water inlet should be lower than the water level.

11) It is strictly prohibited to operate the DC water pump without water or without load, as it may affect the lifespan and noise of the DC water pump.

12) DC pumps are divided into three types: Submersible pump, non Submersible pump, and water and land pumps. Special attention shall be paid to the difference during installation.

Type of DC submersible pump:

1. Brushed DC water pump. 

2. Brushless DC water pump (motor type). 

3. Brushless DC water pump (magnetic drive isolated type).

Features of three types of DC pumps:

1. Brushed DC water pump: When the submersible pump is working, the coil and commutator rotate, but the magnetic steel and carbon brush do not rotate. The alternating change of the coil current direction is completed with the commutator and brush that the motor rotates. As long as the motor rotates, the carbon brush will be worn. When the computer water pump runs to a certain point, the carbon brush wear gap will become larger, and the sound will also increase. After hundreds of hours of continuous operation, the carbon brush cannot play the role of reversing.

Advantages: low price.

2. Brushless motor type DC pump: motor type brushless DC pump is composed of brushless DC motor and impeller. The shaft of the motor is connected with the impeller. There is a gap between the stator and rotor of the water pump. After a long time of use, water will permeate into the motor and the motor will be easily burned.

Advantages: Brushless DC motor has been standardized and has been mass produced by specialized manufacturers, with low cost and high efficiency.

3. Brushless DC magnetic drive water pump: Brushless DC magnetic drive water pump adopts electronic component commutation instead of carbon brush commutation. It adopts high-performance wear-resistant ceramic shaft and ceramic shaft sleeve. The shaft sleeve is integrated with the magnet through injection molding to avoid wear. Therefore, the service life of brushless DC magnetic drive water pump is greatly enhanced. The stator and rotor of the magnetic isolation type water pump are completely isolated. The stator and circuit board are filled with epoxy resin and 100% waterproof. The rotor is made of permanent magnet. The water pump body is made of environment-friendly materials with low noise, small size and stable performance. The winding of the stator can adjust various required parameters, and can operate at a wide voltage.

Advantages: long service life, low noise up to 35dB or less, can be used for hot water circulation. The stator and circuit board of the motor are filled with epoxy resin and completely isolated from the rotor, which can be installed underwater and completely waterproof. The shaft center of the pump is made of high-performance ceramic shaft, with high precision and good seismic resistance.

The difference between brushless DC water pump motor and brushless DC water pump motor

(1) It is not easy to generate high temperature arc and metal chips during reversing.

(2) Less electrical noise, high reliability, long service life and easy high-speed.

(3) Low voltage, fast start and easy control.

(4) Easy to manufacture and small in size.

(5) It can be used in high temperature environment with low maintenance cost.

(6) There is no dirt such as carbon powder and oil mist in the brush part.

(7) No electrical noise (no radio interference).

(8) No sparks.