Causes of pump vibration and methods of vibration isolation

Urban construction tends to be high-level, and people's domestic water needs to be pressurized and promoted accordingly. As an important equipment for pressurized promotion, the pump is used more and more widely. However, the noise and vibration problems it brings also give environmental workers how to control and protect. This article analyzes the origin of the vibration of the pump and presents several treatment ideas.

First, the cause of the pump vibration

1, due to the water pump manufacturing process, but off: the rotor is not balanced; the pump and the motor shaft is not the same; the rotor and the stator part of the collision or friction;

2, due to the use of a long time, the water pump wear aging: impeller loose; bearing damage or bearing clearance;

3. There are impurities in the pump inlet pipe, impeller, and the pump; the water pump and the foundation are not fixed firmly, and the resonance is enhanced.

4. When the water pump is advancing the water flow during operation, accompanying turbulence and cavitation will inevitably produce vibration;

From this, we can conclude that there are many reasons for the vibration of the pump, and that some of the many vibrations generated are inevitable. This requires us to deal with the issue of pump vibration in addition to the water pump itself to strengthen the manufacturing process to reduce the vibration amplitude, the rubber pump through the installation of rubber isolator, spring isolator, the base has become an important method of vibration control of the water pump.

Second, the control of the pump vibration control:

1, install spring vibration isolator:

a. Water pump spring vibration isolator style selection:

Generally choose self-propelled spring shock absorber, its advantages of simple structure, low cost; spring exposed, easy to observe the status of the spring at any time, for the spring to be replaced in advance to avoid excessive spring damage caused by the sudden settling of the pump caused by equipment Injury and tearing of pipes, etc.

b. Spring selection:

The springs used by general shock absorber manufacturers must meet the following requirements: The spring diameter should not be less than 0.8 times the height under rated load; the spring must have a certain extra stroke; the vortex flowmeter should be at least equal to 50% of the rated static deflection; The horizontal stiffness is at least 100% of the straightness to ensure the stability of the shock absorber.

c. Selection of spring damper deflection;

Normally, the spring damper's rated deflection (the spring's rated compression) is generally 25mm (from the frequency value of about 3-4HZ). This deflection can be applied to the vibration isolation of the pump at 650 rpm. When the rotation speed is lower than 650, a spring isolator with a deflection below 40 is recommended.

2. Install rubber isolator:

The choice of rubber isolators: The material is generally neoprene (CR), natural rubber (NR); generally used compression rubber shock absorbers, for lighter weight pumps, can use shear rubber shock absorbers;

Compared with spring shock absorbers, rubber shock absorbers have relatively different vibration isolation performance.

3, install the base dock:

In order to meet more stringent vibration standards, the use of spring isolators is undoubtedly the best choice when retrofitting the base.

The specification of the inert base: the weight of the base is about 1-2 times more than the weight of the water pump; the frame is made of slot iron, and its height is not less than 1/12 of the length, but not less than 150MM, not more than 300MM; long The wide size should cover the entire pump and 10-15 cents on each side. It is also advisable to cover the area of ​​Bay Head; pour the cement and place a layer of reinforcement mesh at one third of the height; add a spring isolator to separate the base from the foundation to 3-5 cm.

Third, the water pump vibration control effect:

Based on the condition of the pump equipment, the above-mentioned method can achieve a vibration isolation effect of 85-99% or more, which fundamentally solves the problem that the vibration of the water pump brings people's lives and industrial production.