The pulp pump factory talked about the balance hole problem
May 18, 2023
In the centrifugal pump impeller, we often see the balance hole, but do not know the size of the balance hole is determined according to what? Does the distance between the back of the impeller and the back cover have an effect on the function of the balance hole? Pulp pump manufacturers for you to introduce the following:
The balance hole is mainly to balance the axial force, which is related to the clearance of the sealing ring. Shen pump book is introduced, the balance hole area for the gap area 5-6 times. We know that the axial force of the pump comes from the pressure difference between the front and rear covers of the impeller. Because the front cover has a water inlet, the back cover is a complete plane, and the pressure generated by the different areas of the two is different, namely, the pressure difference. If the force is not large, that is, the bearing can bear it, it can be solved by the bearing. When the multistage pump, or the impeller is too large, the axial force is the bearing can not bear, it must take other corresponding axial force balance mechanism. Such as balance plate, balance drum, balance hole, etc. The balance hole is a common balance structure with simple structure and convenient processing. We know that the main influencing factor of the pressure difference between the front and back cover plates of the impeller is that the front cover plate is the water inlet hole, and the area is smaller, so there must be a sealing chamber in the back cover plate, and the area is roughly the same as the water inlet area. So the balance hole should be in the sealing chamber of the back cover plate. From the direction of the inlet of the impeller, the balance hole should be set at the inlet of the blade. In order to make the impeller force uniform, the balance hole should be in the same diameter uniform. The size of the balance hole, because the liquid flow on the balance hole is mainly static pressure, so the diameter of the balance hole is not very large.
We can calculate to determine the size of the influence of the balance hole on the axial force, to determine whether the design of the pump also needs other balancing mechanisms.
The balance hole is mainly to balance the axial force, which is related to the clearance of the sealing ring. Shen pump book is introduced, the balance hole area for the gap area 5-6 times. We know that the axial force of the pump comes from the pressure difference between the front and rear covers of the impeller. Because the front cover has a water inlet, the back cover is a complete plane, and the pressure generated by the different areas of the two is different, namely, the pressure difference. If the force is not large, that is, the bearing can bear it, it can be solved by the bearing. When the multistage pump, or the impeller is too large, the axial force is the bearing can not bear, it must take other corresponding axial force balance mechanism. Such as balance plate, balance drum, balance hole, etc. The balance hole is a common balance structure with simple structure and convenient processing. We know that the main influencing factor of the pressure difference between the front and back cover plates of the impeller is that the front cover plate is the water inlet hole, and the area is smaller, so there must be a sealing chamber in the back cover plate, and the area is roughly the same as the water inlet area. So the balance hole should be in the sealing chamber of the back cover plate. From the direction of the inlet of the impeller, the balance hole should be set at the inlet of the blade. In order to make the impeller force uniform, the balance hole should be in the same diameter uniform. The size of the balance hole, because the liquid flow on the balance hole is mainly static pressure, so the diameter of the balance hole is not very large.
We can calculate to determine the size of the influence of the balance hole on the axial force, to determine whether the design of the pump also needs other balancing mechanisms.
Article from the Internet: pulp pump factory tells the problem of balance hole
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