In the heat pump impeller we often see the balance hole, but do not know the size of the hole is based on the amount of what? Does the distance between the back of the impeller and the back cover have an effect on the balance hole? Here's a detailed introduction to everyone. The heat pump impeller balance hole is mainly to balance the axial force, which is related to the seal ring clearance.We know that the axial force of the heat pump is derived from the pressure difference between the front and the back of the impeller, because the front cover has oil inlet and the rear cover is A complete plane, the pressure generated by the difference between the two areas is the pressure difference.If the force is not big, that is, the bearing can withstand, you can solve through the bearing.When the multi-stage pump, or the impeller is too large, the shaft To the force is the bearing can not afford, it must take other appropriate axial force balance mechanism, such as balancing plate, balance drum, balance hole, etc. Balance hole structure is simple, easy processing is a commonly used balance structure.We know that before and after the impeller The pressure difference between the cover, the main factor is the front cover into the inlet hole, a small area, so in the rear cover must have a sealed room, its area is roughly the same as the inlet area (for processing convenience , Take the same before and after the seal ring, you can save a spare part.) So open the balance hole should be in the rear cover of the sealed room, from the import of thermal pump impeller direction, the balance hole should be set in the thermal oil pump impeller inlet (favorable liquid Flow) The impeller uniform force balance on the same diameter of the holes should be uniform in size of the balance holes, because the main flow is balanced by the hydrostatic effect of the hole, the diameter of balance hole so little, and can be generally 3 to 5MM.
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