The KQWR-G hot water circulation pump is a horizontal radially split, rear-opening, single-stage single-suction volute centrifugal pump. The impeller is a closed structure and uses back blades to balance the axial force. The volute of the pump has an end-suction, ejection, and central support structure. The bearings are lubricated by thin oil. The shaft seal adopts a standard mechanical seal or a metal bellows mechanical seal. The seal cavity, bearing bracket, and pump feet can all be cooled by cooling water. , to ensure the service life of mechanical seals and bearings. The structural design of this series of pumps also meets the requirements of process pumps. When using an extended coupling, the rotor components can be disassembled without moving the pump body, the inlet and outlet connecting pipelines and the motor, so that the pump can be reassembled during reassembly. Calibration is relatively simple, which brings great convenience to pump maintenance. If restricted by installation conditions, the intermediate coupling may not be added according to user requirements.

The KQWR-G hot water pump can be equipped with Y2 or YB series motors (380V, 50Hz), or with high-voltage motors (6000V, 10000V, 50Hz). Pumps of the same model can be equipped with motors of different powers under different operating conditions (different shaft powers).

Compared with similar products at home and abroad, this type of hot water pump has the following improvements in structural design:

1. The KQWR-G hot water pump increases the effective volume of the mechanical seal cooling chamber, improves the cooling effect of the mechanical seal, and extends the service life of the mechanical seal;
2. A throttling bypass pipe can be added between the sealing chamber and the pump inlet, so that the high-pressure medium in the sealing chamber flows to the pump inlet. The medium in the sealing chamber is constantly flowing and circulating, which can reduce the temperature and pressure of the sealing chamber, which is beneficial to Mechanical seal service life;
3. The mechanical seal chamber of KQWR-G hot water pump is designed as a standard seal chamber, which can be installed with ordinary single-end mechanical seal, double-end mechanical seal or metal bellows mechanical seal to adapt to different usage conditions. Require;
4. Add a cooling water chamber to the mechanical seal gland, and the cooling water can be used to quench the static ring of the mechanical seal. When the temperature of the pump medium exceeds 130°C, a mechanical seal with a threaded pump and an external heat exchanger should be used. The cooled pump delivers high-pressure medium and flushes the end face of the mechanical seal, greatly extending the service life of the mechanical seal. The normal service life of the mechanical seal is more than one year;
5. Choose reinforced bearings and appropriately increase the volume of the lubricating oil tank and lubricating oil cooling cavity of the bracket bearing. Under normal use, the service life of the bearings will be more than three years;
6. Adopt structural optimization design for the pump shaft to improve the overall stiffness of the pump shaft, reduce the dynamic deflection of the pump operation, and reduce the vibration and noise of the pump operation;
7. The KQWR-G hot water pump uses a metal laminated flexible coupling, which is light in weight, has good dynamic balance performance, can automatically compensate for the displacement of the unit shaft, runs smoothly, has low noise and is energy-saving;
8. The KQWR-G hot water pump adopts an advanced hydraulic model. The pump has good cavitation resistance and can be used as a condensate pump;
9. The back blade is used to balance the axial force, and the residual axial force is borne by a pair of double angular contact ball bearings installed back to back. The structure is simpler than the balance hole, which improves the hydraulic efficiency of the pump and improves the cavitation performance of the pump inlet.