Cip Reflux Pump Mechanical Seal Installation Method
CIP Return Pump is developed by introducing the advanced technology of ABS Pump Manufacturing Company in the Federal Republic of Germany, through absorption and transformation. All performance indicators have reached the national standard level of similar products. Due to the unique single (double) channel impeller, it has strong sewage discharge capacity and can effectively pass fibers 5 times the diameter of the pump and solid particles with a diameter of 50% of the pump diameter. The dynamic seal adopts two sets of special material carbide mechanical seals, made of cast iron and stainless steel.
The CIP reflux pump is easy to install and is the latest pump designed with advanced technology based on the SG type. The pump can be used as a general pipeline pump to pressurize water delivery, and can also pump liquid impurities containing impurities such as granular fibers and suspended solids, providing an ideal conveying machinery for chemical, textile, pharmaceutical, environmental protection and other industries. The CIP reflux pump has a wide range of uses. It can be used as a general pipeline pump to pressurize water delivery for high-rise buildings, and can also transport sewage containing granular fibers. In addition to being suitable for transporting sewage, it is also suitable for use as a drain pump, filter flushing condensation circulation pump, etc.
CIP reflux pump mechanical seal installation method:
1. CIP reflux pump ensures sufficient cooling and lubrication
Adjust the opening of the cooling pipeline regulating valve to ensure that the mechanical seal cooling pipeline is unobstructed. When the tank pump is opened, the gas in the sealing chamber must be completely discharged by opening the drain valve.
2. CIP reflux pump ensures the quality of parts
The mechanical seal of the CIP reflux pump must be tested for sealing performance before leaving the factory and have a certificate of conformity. After long-term operation, the mechanical seal causes wear of the dynamic ring and the static ring, rust and wear of the spring and the shaft, wear, aging, and deformation of the sealing rubber ring, etc., which can cause leakage of the seal and must be repaired or replaced with new parts. The sealing surfaces of the dynamic ring and the static ring must not have cracks, corner loss, scratches, pitting, flashing, and eccentric wear. Scratches and pitting cannot penetrate the entire sealing end face. If the repaired dynamic and static rings are used, the sum of the boss heights of the dynamic and static rings shall not be less than 3mm, and the height of a single boss shall not be less than 1mm to avoid affecting heat dissipation. After the dynamic ring is installed, it should be able to move flexibly on the shaft. After the dynamic ring is pressed against the spring, it should be able to rebound freely to keep the dynamic and static rings vertical and parallel. The specifications of the dynamic and static rings and the sealing rubber rings shall comply with the requirements of the drawings. The surface shall not be damaged, uneven in thickness, or uneven in hardness. The sealing rubber rings shall be replaced during overhaul. The outer surface of the spring is clean and free of rust. The length and shape inspection and pressure test shall be carried out before use. The pressure difference of each group of springs at the specified compression length shall meet the requirements, and the pressure error of each group of springs at the specified compression length shall meet the requirements. The free length tolerance shall not exceed 0.5mm, the compression amount shall not be too large or too small, and the error is required to be ±2mm. The sealing sleeve and the pump shaft cannot be made of the same material. The parallelism tolerance of the end faces on both sides and the non-perpendicularity tolerance with the axis shall not exceed ±0.20mm.
3. CIP reflux pump ensures installation accuracy
When disassembling the mechanical seal of the water pump, the dynamic and static rings should be cleaned, and a small amount of clean lubricating oil should be applied to the friction pair surface. Both the high-pressure end and the low-pressure end should be taken into account, and bumping is strictly prohibited. When installing the static ring gland, apply force evenly to prevent bias. Use a feeler gauge to check that the deviation of the upper, lower, left and right positions is no more than 0.05mm; check the clearance between the gland and the outer diameter of the shaft. The clearance should be even all around, and the allowable deviation at each point should be no more than 0.1ram. The radial runout of the pump shaft at the mechanical seal of the water pump should not exceed 0.05mm. Before installing the pump cover and the sealing end cover, carefully review the installation positioning dimensions of the mechanical seal. If the positioning dimensions do not meet the requirements, you can use a steel pad to adjust between the shaft sleeves, but the steel pad must be accurate and the thickness difference should not exceed 0.01mm. Measure the radial runout of the mechanical seal sleeve and the end face runout of the sealing surface to meet the requirements. For mechanical seals that have been in operation, if the gland is loose and the sealing surface moves, the dynamic and static ring parts must be replaced, and they should never be re-tightened and continued to be used. Because after such loosening, the original motion trajectory of the friction pair will change, and the sealing performance of the contact surface will be easily damaged.
4. Adjust the end face pressure ratio of CIP reflux pump
The end face pressure ratio is an important parameter related to the sealing performance and service life. It is related to the structural type of the seal, the size of the spring and the medium pressure. If the end face pressure ratio is too large, the friction pair will be damaged; if the pressure ratio is too small, it is easy to leak. The manufacturer often gives a suitable range, and the end face pressure ratio is generally 3 to 6 kg/cm2. Adjusting the pressure ratio is to adjust the compression size of the spring. The free length of the spring is represented by A, the load borne when the spring stiffness produces a unit compression is k, and the specified pressure ratio is represented by P. These are all parameters given by the manufacturer. The size after compression is represented by B, then P/A-13=k, and 13=A-e/k is obtained. This is the size of the spring after installation and compression. If the size of the spring after installation is too large, the thickness of the adjustment pad can be increased between the spring seat and the spring. If the size is too small, the thickness of the adjustment can be reduced. The thickness of the adjustment pad is measured with a micrometer.
