1. Water pump noise caused by improper installation
When installing, we pay attention to one level, two stability and three stability. Flat means horizontal. When installing the water pump, the feet must be kept level (special circumstances are a different matter) and cannot be tilted. Stable means it must be stable and cannot be loose and wobbly. Sturdy means that the installation foundation must be solid and stable, and one side cannot be grounded and the other side cannot be suspended in the air. In addition, in order to avoid resonance and noise, the pipe pump feet should be equipped with vibration isolation pads, and the inlet and outlet must be equipped with expansion joints (soft joints). Why do we do this? Since the motor of the water pump is inherently noisy and accompanied by slight vibration during operation, if no vibration isolation pad is installed, a chain reaction will occur between the water pump and the foundation, and the resonance will intensify the vibration. If expansion joints are not installed at the inlet and outlet, the vibration and noise of the motor will be transmitted to the pipeline, and the pipeline will act like a resonance chamber, which will further intensify the vibration and noise. At the same time, the pipeline will also emit sound and vibration under the action of water flow resistance and pressure in the pipeline, so expansion joints must be installed to eliminate resonance and resonance between the pipeline and the water pump.

2. Noise caused by unbalanced water pump impeller
Some water pumps have been used for a long time, and the impeller may be damaged by debris sucked into the pump cavity during operation, or other reasons may cause the impeller to lose balance, causing the impeller to lose its balance. The motor bearings have different load-bearing strengths, causing noise. At the same time, the motor shaft will also be affected by the unbalanced impeller, causing it to be out of center and causing noise.

3. Noise caused by bearing damage
Some customers install the water pump outdoors and use it without any cover. Rainwater will be sucked in by the fan blades from the motor windshield. If it invades the bearing chamber of the motor back cover, the bearing will be oxidized and rusted, and the bearing ball will no longer be smooth. , mechanical noise will be emitted. If it is installed indoors, this problem generally does not occur, but there will be another situation. If the mechanical seal is damaged and is not replaced in time, it is still used and the water is not cut off. The mechanical seal loses its sealing effect and the pump chamber is damaged during operation. The internal pressure causes the water in the pump body to spray out. The water retaining ring on the motor shaft can protect the motor bearings from water intrusion for a short period of time. However, if more and more water sprays out and invades the bearing chamber, it will also damage the bearings. At this time, the sound of the working water pump may be as loud as a train running over the rails.

Definition: What we call a pipeline pump refers to a centrifugal pump whose inlet and outlet are on the same straight line, so the pipeline pump is also called a pipeline centrifugal pump. Pipeline pump is not a professional term in the pump industry. It is a private term based on the characteristics of the pump – when installed, it is installed on the pipeline just like a section of pipe, so it is named pipeline pump. Figures 1 and 2 below show typical vertical single-stage pipeline pumps and vertical multi-stage pipeline pumps.

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As shown in Figure 1, it is a vertical single-stage pipeline pump, and Figure 2 is a vertical multi-stage pipeline pump, with the same inlet and outlet, which is very convenient to install. In particular, the vertical multi-stage pipeline centrifugal pump is now widely used in the water supply field. Typical products are CRF vertical multistage centrifugal pump

Features: Since pipeline pumps are centrifugal pumps, they naturally have the characteristics of centrifugal pumps, including not only simple structure, numerous models, wide range of performance, relatively low price, especially the feature that the inlet and outlet water are in the same straight line, which makes installation more convenient. , It is not necessary to disassemble pipes etc. during general maintenance.

Summary: Pipeline pumps are cheap, easy to install and do not need to dismantle pipelines during general maintenance. These three characteristics determine that pipeline pumps are widely used in pipeline pressurization in industrial and civil fields. Including not only the pressurization of industrial production water, the pressurization of various cooling circulating water, the pressurization of tap water pipes in various civil or commercial buildings, the pressurization of various central air-conditioning circulating water, etc.

It should be noted that there are subtle differences between pipeline pumps and pipeline booster pumps. Pipeline booster pumps are a general term, which means that any booster pump that can be used for pipeline boosting can be a pipeline booster pump. Pipeline pumps It is just a type of pipeline booster pump. Pipeline booster pumps may also include horizontal structures or vertical multi-stage centrifugal pumps with water inlet below and water out above. As shown in Figure 3, it is a typical vertical multi-stage centrifugal pump with bottom in and top out. It is also a pipeline booster pump, but it cannot be called a pipeline pump.

Figure 3, vertical multi-stage centrifugal pump, water inlet from the bottom and water out from the top

1. Generally, pipeline pumps are marked. The arrow on the pump body or base points to the water outlet of the pipeline pump, and the remaining one is the water inlet.

2. Observe the structure. The closer to the base is the water inlet. The right side of the picture below is closer to the base. This is the water inlet. The water flows in and is sucked in by the impeller (point 2) and then thrown out to the water outlet and enters the pipeline.

3. Generally, the water outlet of a pipeline pump has a copper exhaust valve, which is used to exhaust air or install other sensors. The outlet with this component is the water outlet. If you still can’t tell, please contact us for technical support.

In fact, this is a common problem of many cheap automatic booster pumps. The main reasons for this phenomenon may be as follows:

1. The check valve is leaking. The check valve itself can only go in but not out. If a check valve with poor quality is used, when the water pressure in the pump chamber increases, the pressurized water will seep back into the water inlet end of the pump, causing The pressure inside the pump chamber decreases. After the sensor detects the decrease in water pressure, it will restart the booster pump to compensate for the pressure. Since there is no water in the water outlet direction of the pump, the pressure is quickly replenished, and the booster pump immediately goes into sleep mode again. The reciprocating cycle causes this phenomenon of beeping and stopping. The solution is to replace the one-way check valve with a quality-approved one. In fact, most of the causes of beeping and stopping are caused by the check valve.

2. There is a leak in the pump outlet pipe. The principle of water leakage in the direction of the outlet pipe causing a beep and stop is the same as the leakage of the check valve. The reason is that the water pressure in the pump chamber is reduced and the water pump is restarted to compensate for the pressure. Since the water output in the outlet direction is very small , causing the pressure to rise to the set pressure value in a short period of time and causing the booster pump to shut down to maintain pressure. After the pressure is reached, the water pressure will drop due to water leakage, and the booster pump will replenish the pressure. The reciprocating cycle will cause a beeping and stopping phenomenon.

3. Sensor failure. This phenomenon will also occur when the pressure feedback is inaccurate. The principle is actually the same. When an incorrect low pressure is fed back, the booster pump will also compensate for the pressure and cycle back and forth.

4. The frequency of water use is too high. If the booster pump is controlled by pressure difference, it will also cause the phenomenon of starting and stopping when water is used frequently. The reason is the same as water leakage in the outlet pipe, and this situation may occur more frequently when it stops, especially if there is no pressure tank to stabilize the pressure. If you want to completely eliminate this situation, it is recommended to change the differential pressure controller to a frequency converter control, or directly replace it with a new variable frequency booster pump to solve the problem of beeping and stopping when using water.

1. When the pumped liquid level is lower than the upper end surface of the pump impeller or the pump shaft, the pump should be equipped with a check valve, and the outlet end should be connected to a tee for water diversion. When in use, the pump should be filled with water and the Tighten the screw plug. The pipeline connections should be tight, especially the water inlet pipeline should not leak, otherwise the pump lift will be reduced or water will not be pumped. Before water enters the pump chamber, do not rotate continuously for a long time to avoid damaging the mechanical seal.

2. The motor coil is equipped with a safety protector. When the pump fails or the water cannot be pumped, causing the motor temperature to rise above the specified value, the circuit can be automatically cut off. After the fault is eliminated, the motor temperature rise drops and the operation can be automatically resumed. The booster pump motor is a capacitor-operated motor, and the rotation direction has been adjusted when the pump leaves the factory. If you need to replace the capacitor or rewiring, please wire according to the arrow direction mark on the pump body. To ensure safe use, please use a three-core safety socket with a ground wire.

3. When water leakage is found in the pump, stop it immediately and check to prevent internal leakage. If water leaks from the connection part with the motor, replace the mechanical seal. Check if the power is on. Check whether the power supply voltage used is consistent with the working voltage of the pump. Open the pump cover, remove foreign matter in the pump, reinstall the pump cover, and tighten it to normal.

For the installation parts of the water pipe booster pump, everyone needs to know the specific installation method and the installation method, so as to ensure that the family can use water normally. The above is the relevant introduction about the methods of boosting water pipes without electricity and the installation methods of water pipe booster pumps. When installing the water pipe booster pump, you must understand the method of boosting.

1. Noise source analysis
The working noise of the booster pump mainly includes: aerodynamic noise generated during the transportation of gas/liquid, structural noise caused by vibration of the motor casing, noise generated by vibration of the machine base, and noise from the motor.

2. Measures to control booster pump noise
1. It is relatively easy to deal with aerodynamic noise in terms of pump body noise control. Commonly used methods include adding sound insulation covers and using sound-absorbing materials.
2. For vibration isolation of the booster pump system, we generally use a vibration isolator. If the vibration of the pump body is strong, floating ground is preferred, because the floating ground has a better shock-absorbing effect and can play a vibration-absorbing frequency band. Wider, too.
3. Comprehensive damping and sound insulation wrapping is performed on the pump body pipeline. On the one hand, it can reduce the vibration of the pipeline, and on the other hand, it can also play the role of isolating air sound.

3. Effect and user evaluation
After treatment, the noise value of the booster pump room dropped below 30dB(A), meeting national requirements.
Residents reported that the “buzzing” noise upstairs has been significantly reduced, and their families can rest normally. Other upstairs neighbors can basically no longer hear the noise of the booster pump.

Booster pump noise control is a professional and systematic renovation project. Acoustic design and processing should be done jointly from the sound source, propagation and user receiving end, so as to minimize the impact of pump noise on residents and build a A peaceful space and a harmonious living environment require professional noise reduction technology analysis and production solutions.