Pipeline sewage pump mechanical seal installation methods and troubleshooting methods

     First, the pipe sewage pump to ensure component quality

Pipeline sewage pump mechanical seal to be done before the seal performance test, and a certificate. Long-term operation of the mechanical seal, ring and static ring wear, spring and shaft corrosion wear, sealing rubber ring wear, aging, deformation, etc., can cause a sealed leak, you must repair or replace the new pieces. Moving ring and static ring sealing surface without cracks, off angle, scratches, pitting, flash and partial wear, scratches, pitting can not penetrate the entire sealing face. If you use the static and dynamic ring repaired, static and dynamic ring boss height of not less than 3mm, and a single boss height of not less than lmm, so as not to affect the cooling. After the moving ring is installed, it should be ensured that it can be flexibly moved on the shaft. After the moving ring is pressed against the spring, it should be able to rebound freely and maintain the vertical and parallel movement rings. Ring static ring seal specifications in line with the provisions of the drawings, the surface shall not be damaged, uneven thickness and uneven distribution of soft and hard, to be replaced when the overhaul sealant. The outer surface of the spring should be clean and free from rust. Before use, the length profile test and pressure test should be carried out. The pressure difference between each set of springs at the specified compression length should meet the requirements. The pressure error of each set of springs at the specified compression length should meet the requirements. Free length tolerance of not more than 0.5mm, the amount of compression can not be too large or too small, the required error ± 2mm. Gland and pump shaft can not be the same material, both sides of the parallelism tolerance and axis of non-perpendicularity tolerance Not more than ± 0.20mm.

Second, the pipeline sewage pump to ensure adequate cooling and lubrication

Adjust the cooling pipe valve opening, to ensure that the mechanical seal cooling pipe unobstructed, open the drain valve when the tank pump to drain the gas seal chamber.

Third, the pipe sewage pump to ensure installation accuracy

Disassembly pump mechanical seal, static and dynamic ring to be cleaned, and smear a small amount of clean friction on the secondary surface of the lubricating oil, both high and low pressure to take into account, is strictly prohibited bump. Static pressure gland installed hard to be uniform, to prevent pressure offset, with a feeler gauge, the upper and lower left and right position of the deviation of not more than 0.05mm; Check the gland and the outer diameter of the shaft with the gap around the uniform tolerance of each point is not greater than 0.1ram. Install pump mechanical seal parts of the pump shaft radial runout does not exceed 0.05mm. And the pump cover and seal the end cover before, to carefully review the installation of mechanical seal positioning size, if the positioning size does not meet the requirements of the shaft Suite with steel pad to adjust, but the steel pad to high precision, the thickness difference of not more than 0.01mm. Measurement of mechanical seal sleeve radial runout and the sealing surface of the end beat to meet the requirements.

Mechanical seals on the run, where gland loose sealing surface to move the case, the dynamic and static ring parts must be replaced, should never be re-tighten the continued use. Because after such a loose, friction pair of the original trajectory will change, the contact surface of the sealing performance can easily be destroyed.

Fourth, the pipe sewage pump adjust the end pressure

End pressure is related to the sealing performance and service life of an important parameter, it sealed structure type, spring size and medium pressure. Excessive pressure than the end face will increase the friction pair; less than the pressure is easy to leak, often given by the manufacturer a suitable range, the end pressure than the general take 3 ~ 6kg / cm2. Adjusting the pressure is to adjust the compression size of the spring. The free length of the spring is denoted by A, the load that the spring stiffness produces when the unit compression amount is k, and the required specific pressure is represented by P, all of which are given by the manufacturer. Compressed size with B said, P / A-13 = k, resulting in 13 = Ae / k, which is compressed spring installation size. If the spring is oversized, the thickness of the adjusting pad can be increased between the spring seat and the spring. If the size is too small, the thickness of the adjusting pad is reduced. The thickness of the adjusting pad is measured by a micrometer.

　　 Self-priming sewage pump common troubleshooting methods:

ZW-type self-priming sewage pump is self-priming and non-clogging sewage in one, using the axial flow of mixed, and through the pump. The unique design of the impeller runner allows the delivery of clean water and the delivery of sewage and manure with particles and fibers. Widely used in municipal sewage projects, pond culture excrement disposal, sediment waste mineral impurities, light industry, paper, food, chemicals, pharmaceuticals, electricity, paddles and mixtures of chemical products such as quality products. Sewage pump with strong suction without blocking the structural design.

ZW self-priming sewage pump common fault and troubleshooting:

First, the symptoms (no water)

Cause Analysis:

1. There is no fluid in the pump housing or insufficient fluid

2. Inhalation pipe leakage

3 speed is too low

4. Suction too high or too long suction pipe

5. Mechanical seal leakage is too large

6. Suction pipe gas can not be discharged from the outlet

Method of exclusion:

1. Add enough stock solution

2. Check and correct the leak

3. Adjust the speed

4. Reduce suction or shorten suction line

Repair or replace

6. Exhaust it

Second, noise and vibration larger

Cause Analysis:

1. Feet unstable

2. The pump shaft is bent

Cavitation phenomenon

4. Bearing wear serious

5. There are debris imported pipe

6. Both pump and motor spindle is not concentric

Method of exclusion:

1. Reinforced

Replace or correct

3. Adjust the working conditions

4. Replacement

5. Clear debris

6. Adjust the coaxiality

Third, the lack of water

Cause Analysis:

1. The impeller runner and suction tube are blocked

2. impeller or impeller seal wear and tear

3. Insufficient power or too low speed

Method of exclusion:

1. Remove the blockage

2. Change the mouth ring

3. Add enough power, adjusted to rated speed

Fourth, the shaft power consumption is too large

Cause Analysis:

The traffic is too big

Speed ​​is too high

3. Pump shaft bending or impeller card touch

4. The pump runner is blocked or stuck

Method of exclusion:

1. Raise the outlet pressure

2. Appropriate to reduce

3. Replace or correct

4. Line up the blockage

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