IRG hot water pump is a hot water pump product optimized and designed based on the ISG and ISW centrifugal pump series. In particular, IRG hot water circulation pump is used in large quantities. Because the pump adopts a vertical installation of the motor on the upper part, and there is a short bracket between the pump and the motor, it will not cause water to enter the motor and burn the motor due to mechanical seal leakage. In addition, it can also be designed based on the IRG hot water pump as a hot water high temperature pump product with a mechanical seal and an external tap water cooling device, and the high temperature can reach 240°C.

The seals commonly used in cold water pumps are packing seals or mechanical seals made of nitrile rubber. The most common pump that uses packing seals is the IS single-stage single-suction centrifugal pump. This pump is also a very early cold water pump product. Since the packing itself requires liquid cooling and lubrication, the pump can only withstand a temperature of about 80 degrees. In addition, the cold water pump with packing seal has a dripping phenomenon, which pollutes the pump base and the surrounding environment of the pump to a certain extent. This type of product has been gradually replaced by ISG and ISW centrifugal pump series products. The ISG and ISW cold water series use mechanical seals, which will not leak, and both use a direct-connected structure with the impeller on the motor shaft. It is significantly better than the old IS series cold water pump in terms of noise and vibration. This type of pump product is often used for air conditioning water circulation, so it is also called air conditioning chilled water circulation pump.

This study uses a high-pressure hot water pump of model P-8io2n/B/s, which uses high-temperature water as the medium, and the water temperature is 237 degrees Celsius. The diameter of the shaft is 65 cm, the pressure at the time of entry is 1. 25MPa, the pressure at the time of outflow is 1. 85MPa, and the number of revolutions is 2875r/min. This hot water pump is an advanced equipment of a petrochemical company, and its effect is good. It is related to the company's product production, so when installing and designing the hot water pump, it must be strictly controlled. The sealing method used by this type of water pump is one-way sealing, and its sealing work must ensure safety and reliability. The sealing device originally used is the original device, and its effect is not very good. The seller has a bad service attitude and will not let the buyer try it. The price is high and the delivery time is long, which takes more than six months. The company is also very troubled by this problem. After research and analysis, the design of the water pump was changed.

The movable surface material used in this method is excellent impregnated graphite, the material of the immovable surface is SiC, and the material of the O-ring that plays an auxiliary role is - [CF2 = CF2-] n-polytetrafluoroethylene), which is developed based on water, a substance that is easy to evaporate, and has a large degree of balance. In addition, considering that water substances are more easily vaporized, a fluid dynamic pressure groove device is added to the movable surface of the seal. This type of equipment helps water substances to effectively lubricate the sealing surface, thereby improving the effect of the mechanical seal and extending its service life. Therefore, the sealing surface is appropriately improved and adjusted. After its shape and size reach the state, when the product is manufactured, the movable surface is processed within the effective time to relieve the adverse effects of stress. At the same time, various functions are tested before operation and use. After ensuring that there are no problems, they are widely promoted and operated. After operation, its effect is significantly improved, the performance is improved, the service life is increased by two years, and a lot of resources are saved. If a fault occurs, the time and cost of repairing it are reduced, ensuring the safe use of the facility.