The best circulating water pump - A Comprehensive Guide

The circulating water pump also known as the centrifugal circulating water pump, is the power of the water supply circulating system to ensure that the water can circulate in the system according to the set flow. The basic principle of a circulating water pump is to use an electric motor to drive the pump shaft to rotate, causing the impeller inside the pump to rotate, thereby converting mechanical energy into kinetic and potential energy of water, and promoting the flow of water in the pipeline. During the circulation process, water is heated, cooled, filtered, and finally returned to the inlet of the circulating water pump, forming a closed circulation system.

Circulating water pumps are widely used in industrial chemicals, pharmaceutical electronics, building water supply and other industries. Circulating water pumps are common in heating and air-conditioning water systems. For example, hot water recycling pumps are installed on the return water pipes of the heating system to increase indoor temperature by improving hot water circulation. Circulating water pumps are also widely used in zero cold water heaters, computer water cooling systems, energy storage industries, chillers, automobile industries, etc, These industries use small water circulating water pumps, and the voltage is generally 12v, 24v or 48v DC.

We can offer OEM/ODM service,circulating water pump series by shenpeng:

Want to learn more?

R & D, design and production of Circulating 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 town, 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.    small electric water pump

What is circulating water pump?

The circulating water pump, also known as the centrifugal circulating water pump, is the power of the water supply circulating system to ensure that the water can circulate in the system according to the set flow. The circulating water pump includes single-stage circulating water pump, multi-stage circulating water pump, single-stage double suction centrifugal circulating water pump, etc. The pump shaft rotates, and the internal water flow is centrifugal. Circulating water pumps are widely used in industrial chemicals, pharmaceutical electronics, building water supply and other industries. Circulating water pumps are common in heating and air-conditioning water systems. For example, hot water recycling pumps are installed on the return water pipes of the heating system to increase indoor temperature by improving hot water circulation. Circulating water pumps are also widely used in zero cold water heaters, computer water cooling systems, energy storage industries, chillers, automobile industries, etc, These industries use small water circulation pumps, and the voltage is generally 12v, 24v or 48v DC. Working principle of circulating water pump.The pump used to circulate water is called recirculating pump.      MORE>>

Composition of circulating water pump:

The basic structure of circulating water pump consists of impeller, pump body, pump cover, water retaining ring and pump shaft. The bearing, seal ring, stuffing box and axial force balancing device are composed of eight parts. The circulating water pump works through the rotation of the impeller to make the water produce centrifugal movement. Circulating water pumps include self-priming pumps, centrifugal pumps, submersible pumps, pipeline pumps, diaphragm pumps, screw pumps, pipeline pumps and magnetic pumps.

Structure and function of circulating water pump

1. Impeller is the core component of circulating water pump, which has high speed and large output force.

2. The pump body, also known as the pump housing, is the main body of the circulating water pump. It plays a supporting and fixing role and is connected with the bracket to install the bearing.

3. The function of the pump shaft is to connect the motor with the coupling to transmit the torque of the motor to the impeller, so it is the main part of the transmission of mechanical energy.

4. The stuffing box is mainly made of stuffing, which can prevent the water in the pump from flowing to the outside and the external air from entering the pump. Keep the vacuum in the circulating water pump at all times. When the pump shaft and the gasket rub to generate heat, water must be injected into the gasket ring through the water seal pipe to cool the gasket.

5. Axial force balancing device. During the operation of the circulating water pump, as the liquid enters the impeller under low pressure and flows out under high pressure, the pressure on both sides of the impeller is not equal, and the axial thrust towards the inlet direction is generated. This will cause the rotor to move axially, causing wear and vibration. Therefore, axial thrust bearing should be installed to balance the axial force.

Working principle of circulating water pump

The working principle of a circulating water pump can be simply summarized as the following steps:

1. Water absorption stage: When the circulating water pump starts, the electric motor starts to work, driving the impeller to rotate. The rotation of the impeller generates centrifugal force, which sucks water into the pump body from the inlet

2. Water pressure stage: As the impeller rotates, water is pushed to the outlet of the pump body, forming a certain pressure. The greater the pressure, the faster the water flow rate

3. Transportation stage: After the water pressure stage, the water is pushed into the pipeline and transported to the desired location through the pipeline. During the transportation process, the circulating water pump needs to overcome factors such as frictional resistance and gravity in the pipeline.

4. Circulation stage: After being transported to the destination, water can be recycled again. If it is necessary to continue recycling, the circulating water pump will continue to work, suck water back into the pump body, and perform water pressure and transportation again.

Precautions for use of large circulating water pump

1. Before installation, check whether the inlet and outlet of circulating water pump are blocked by foreign matters;

2. Before installing into the system, the sundries in the system pipeline shall be washed away to prevent the sundries from winding around the impeller during the operation of the circulating water pump, which may cause the rotor blockage;

3. During installation, the pump shall be installed with gentle force, not with strong force, so as not to damage the pump body;

4. The inlet and outlet of the circulating water pump shall be equipped with unions for easy assembly and disassembly.

5. For safety wiring, the plug of three strand wire with ground wire shall be used, and the ground wire end shall be connected with the motor shell to ensure safety.

6. The product has low noise. When checking whether it is rotating, you need to use a screwdriver to hold your ear and listen carefully.

7. The diving rotating part is lubricated by water, so please do not run without water for a long time.

Maintenance and upkeep of large circulating water pumps

1. Daily inspection

1.1 Check the lubrication of the water pump to ensure that the bearings, seals, and other parts are adequately lubricated.

1.2 Check the inlet and outlet pressure and flow rate of the water pump to ensure its normal operation.

1.3 Check the vibration and noise of the water pump. If there are any abnormalities, they should be dealt with in a timely manner.

2. Regular maintenance

2.1 Cleaning the water pump: Regularly clean the sediment and impurities inside the water pump to prevent blockage and wear.

2.2 Replacement of seals: Regularly replace the seals of the water pump to ensure its good sealing performance.

2.3 Checking bearings: Regularly check the wear of bearings and replace them in a timely manner if necessary.

2.4 Calibration: Calibrate the inlet and outlet pressure, flow rate, and other parameters of the water pump to ensure its accuracy.

3. Troubleshooting

3.1 When the water pump malfunctions, it should be stopped for inspection first to identify the cause of the malfunction.

3.2 Carry out corresponding repairs based on the cause of the malfunction, such as replacing damaged parts, adjusting parameters, etc.

3.3 After maintenance, the water pump should be tested to ensure that it returns to normal operation.

4. Precautions

4.1 When carrying out maintenance and upkeep, the power should be cut off first to ensure safety.

4.2 Strictly follow the prescribed operating procedures for maintenance and upkeep to avoid equipment damage caused by improper operation.

4.3 Regularly inspect the water pump to promptly identify and address potential issues.

In short, regular maintenance and upkeep of the circulating water pump is the key to ensuring its normal operation and extending its service life. Therefore, operators and managers should attach great importance to the maintenance and upkeep of the circulating water pump to ensure the normal operation of the equipment and stable production.

The main characteristics of circulating water pumps include:

High efficiency: The circulating water pump adopts advanced impeller design and optimized structure, which can achieve efficient hydraulic performance and reduce energy consumption.

High reliability: The circulating water pump adopts high-quality materials and strict production processes, which have high stability and reliability.

Easy to maintain: The structural design of the circulating water pump is simple, and the replacement of components is convenient, reducing maintenance costs and time costs.

In practical applications, the selection and design of circulating water pumps need to be based on different process requirements. For example, in the power industry, circulating water pumps need to meet the requirements of high temperature, high pressure, and large flow rate; In the chemical industry, circulating water pumps need to adapt to corrosive media and high-temperature and high-pressure working environments.

In short, circulating water pumps are one of the indispensable and important equipment in modern industry, and their high efficiency, reliability, and easy maintenance provide strong support for industrial production.

Features of large circulating water pumps

1. The circulating water pump adopts excellent hydraulic model and advanced manufacturing technology, which greatly improves the performance and service life of the pump.

2. As the shaft seal is made of cemented carbide and fluororubber, it can improve the reliability of the pump operation and the temperature of the transmission medium.

3. The overflow part of the pump is made of stainless steel plate by stamping and welding, which makes the pump suitable for slightly corrosive media.

4. The overall structure is compact, small in size, light in weight, low in noise, significant in energy saving, and convenient in maintenance.

5. The water inlet and outlet of the pump are located on the same horizontal line of the pump base and can be directly used in the pipeline.

6. The standard motor is adopted, and users can easily equip the motor according to their needs.

7. The intelligent protector can be equipped according to the user's needs to effectively protect the pump from dry running, phase loss, overload, etc.

Main purposes of large circulating water pumps

1. Water supply: filtration and transmission of the water plant, water supply by zones of the water plant, main pipe pressurization, and high-rise building pressurization.

2. Industrial pressurization: process water system, cleaning system, high-pressure flushing system, fire protection system.

3. Industrial liquid transportation: cooling and air conditioning system, boiler water supply and condensation system, machine tool matching, acid and alkaline medium transportation.

4. Water treatment: water treatment system of ultrafiltration system, reverse osmosis system, distillation system, separator and swimming pool.

5. Irrigation: farmland irrigation, sprinkler irrigation and drip irrigation.

Medium delivered by large circulating water pump

1. Thin, clean, nonflammable and explosive media without solid particles or fibers.

2. Such as mineral water, softened water, pure water, clear oil and other light chemical media.

3. The main material of the pump is stainless steel, which can be used for pumping slightly corrosive media.

Selection principle of circulating water pump

The selection principle of circulating water pump is based on the flow, head, performance curve, model parameters, etc. of industrial circulating water pump.

1. The flow head of the circulating water pump shall be determined. First, the hydraulic operation of the pump shall be accurately calculated. The head of the hot water circulating water pump cannot flow too much margin. According to the characteristic curve of the circulating water pump and the pipe characteristic curve, the actual head will also decrease, the flow will increase, the flow of the motor will increase significantly, and the power will also increase significantly. If the specified value is exceeded, the motor will be damaged. As the flow increases, the rotational speed will also increase, which will adversely affect the pump shaft of the air conditioning circulating water pump. When the flow is large, the NPSH will also increase, increasing the situation of shaft breakage.

2. It can be clearly seen from the flow and head characteristic curve of the circulating water pump that the working point of the circulating water pump is relatively stable. When the hydraulic condition changes, the head change will become smaller. The characteristic curve of single-stage single-suction pump is relatively flat, so single-stage pump can be used as circulating water pump.

3. The working point of the circulating water pump can be within the high efficiency area.

4. Determination of the number of units. The number of circulating water pumps shall be determined. Generally, there shall be no less than two, one as standby pump. When there are four or more circulating water pumps running in parallel, there is no need to set a standby pump. When centralized regulation is conducted, the same type of circulating water pumps can be used for parallel operation.

5. When multiple circulating water pumps are running in parallel, the characteristic curve can be drawn, and the circulating water pump can be selected only after the working point is determined. The selection principle of circulating water pump is derived from the hydraulic calculation results.

The difference between AC circulating water pump and DC circulating water pump

According to its driving mode, circulating water pumps can be divided into AC circulating water pumps and DC circulating water pumps. Below, we will provide a detailed introduction to the main differences between these two types of water pumps.

1. Different driving methods

The AC circulating water pump is driven by an AC power source and generates power through the rotation of the motor to drive fluid circulation. The DC circulating water pump is driven by a DC power source, usually powered by a battery or DC power adapter.

2. Different structures

AC circulating water pumps usually have a larger volume and weight because they need to accommodate components such as motors, bearings, seals, etc. Due to the use of batteries or DC power adapters as power sources, the DC circulating water pump has a smaller volume, lighter weight, and is easy to move and install.

3. Different efficiencies

At the same power, the efficiency of DC circulating water pumps is usually higher than that of AC circulating water pumps. Because DC power can provide stable voltage and current, it avoids the impact of harmonic interference and voltage fluctuations in AC power on the performance of water pumps.

4. Noise and vibration are different

The AC circulating water pump generates significant noise and vibration during operation, mainly due to mechanical vibration caused by motor rotation and fluid noise caused by fluid flow. However, due to the use of batteries or DC power adapters as power sources, the DC circulating water pump operates with less noise and vibration.

5. Different maintenance and upkeep

The maintenance and upkeep of the communication circulating water pump is relatively simple because its structure is more intuitive and its components are relatively easy to replace. However, due to its compact structure, the maintenance and upkeep of DC circulating water pumps are relatively complex and require professional personnel to operate.

In summary, there are significant differences between AC circulating water pumps and DC circulating water pumps in terms of driving mode, structure, efficiency, noise and vibration, as well as maintenance and upkeep. When selecting and using, it is necessary to consider the specific needs and usage environment comprehensively.

What is a DC circulating water pump?

DC circulating water pump is a device used in water circulation systems, whose main function is to transport water from one location to another and maintain stable pressure and flow rate in the system. DC circulating water pumps are usually driven by DC motors, therefore they have high efficiency and reliability.

In a DC circulating water pump, the motor drives the impeller to rotate, sucking water into the pump from the inlet and then discharging it from the outlet through the rotation of the impeller. This type of pump has a compact structure, which is easy to maintain and install. At the same time, due to its use of DC motor drive, there is no need for additional transmission devices such as transmissions or gearboxes, further simplifying the system structure.

In many applications, DC circulating water pumps play an important role. For example, in a refrigeration system, a DC circulating water pump transports refrigerant from the condenser to the evaporator, thereby maintaining stable pressure and flow in the system. In industrial production, DC circulating water pumps can be used to transport various liquids and gases, meeting the needs of production processes.

In addition to high efficiency and good reliability, DC circulating water pumps also have other advantages. For example, due to its compact structure, it occupies less space and is easy to install and maintain. In addition, due to its advanced control technology, it can achieve automated control and remote monitoring, further improving the intelligence level of the system.

In summary, DC circulating water pumps are efficient, reliable, and compact equipment widely used in various water circulation systems and industrial production. With the continuous progress of technology and the increasing demand for applications, the performance and function of DC circulating water pumps will also be continuously improved and perfected.

What is an AC circulating water pump?

AC circulating water pump is a device used in water circulation systems, usually used to transport water from one place to another while maintaining water circulation. This type of water pump is usually driven by an electric motor, which drives the water flow through the rotation or vibration of the pump body.

AC circulating water pumps are commonly used in various industrial and commercial applications, such as cooling systems, boiler systems, heating systems, etc. In the cooling system, the AC circulating water pump can transport cooling water from the cooling equipment to the radiator or other cooling equipment to maintain the normal operation of the system. In the boiler system, the AC circulating water pump can transport water from the boiler to the radiator or other equipment to maintain the temperature stability of the system.

AC circulating water pumps usually have characteristics such as high efficiency, low energy consumption, and high reliability. Their design and manufacturing process need to consider many factors, such as the material of the pump body, sealing, lubrication, wear resistance, etc. In addition, the installation and use of communication circulating water pumps also need to follow certain standards to ensure their normal operation and service life.

In summary, the communication circulating water pump is an important water circulation equipment widely used in various industrial and commercial applications. Its design and manufacturing need to consider many factors, and installation and use also need to follow certain standards.

What is a 12V circulating water pump?

A 12V circulating water pump is a type of circulating water pump that is driven by a 12 volt DC power supply. It is usually used for water heating mattresses, or other occasions that require water circulation.

The main function of a circulating water pump is to pump water from one place to another to maintain its fluidity. In a 12V circulating water pump, when the power is turned on, the electric motor will drive the pump shaft to rotate, thereby drawing water in from the inlet of the pump and discharging it from the outlet. This type of water pump typically has a higher flow rate and lower head, making it suitable for short distance circulation systems.

The 12V circulating water pump usually has the following characteristics:

Efficient: This type of water pump can efficiently pump water from one place to another, thereby maintaining water cleanliness and health.

Stability: The flow and head of the 12V circulating water pump are stable, ensuring the stable operation of the system.

Easy to maintain: This type of water pump has a simple structure and is easy to maintain and repair.

Low noise: The 12V circulating water pump operates with low noise and will not have an impact on the surrounding environment.

In summary, the 12V circulating water pump is an efficient, stable, and easy to maintain water pump, suitable for various situations that require water circulation.