And other pumps, impeller, water pressure chamber, is the two core components of the sewage pump. Its performance, also on behalf of the pump performance, anti clogging sewage pump performance, efficiency and cavitation performance, anti abrasion performance is mainly composed of vane pump and water pressure chamber to ensure that the two major components. The following are an introduction:
1. The structure of the impeller type: the impeller structure is divided into four categories: blade type (open and closed), cyclone type, channel type, (including single channel and dual channel) spiral centrifugal four open, semi open impeller has the advantages of easy fabrication, when the impeller can cause blockage, easy cleaning and maintenance but, in the long run, the particle abrasion will make the clearance of blade and the side wall of the indoor water pressure increase, thereby reducing efficiency. And the increase of clearance will break the pressure distribution on the blade. Vortex is not only a large amount of losses and the pump will increase the axial force, at the same time, increase the gap, flow in the stability of liquid flow damage to the pump vibration, the impeller type is not easy to transport with large particles and long fibers of the media, from the performance perspective, the type of impeller efficiency is low. The highest efficiency is equivalent to an ordinary closed around 92%, a relatively flat head curve.
2. Swirl impeller: the type of impeller pump, due to the impeller part or all of the reduced pressure water chamber. Therefore, no blocking performance, over particle capacity and long fiber through a strong ability. Particles in the pressurized water flow through the impeller rotation of the vortex generated by the promotion of the movement, the suspension of the particle itself does not produce energy, just in the flow channel and liquid exchange energy. In the flow process, the suspended particles or long fibers do not contact with the leaves, leaves the situation much less wear and tear, there is no space because of increased erosion and, in the long run will not cause a serious decline in efficiency, the type of impeller pump used for pumping large particles with the medium and long fibers. From the performance, the efficiency of the impeller is low, only the equivalent of about 70% of the ordinary closed impeller, the head curve is relatively flat.
3. Closed impeller: the type of normal efficiency of the impeller is higher. And in the long run, the situation is relatively stable, the type of impeller pump axial force is small, and can be set on the front and back cover plate. The auxiliary vane on the front cover can reduce the vortex loss of the impeller inlet and the wear of the seal ring. On the back side vane not only play the role of axial force balance, but also can prevent the suspended particles into the cavity of the mechanical seal mechanical seal protection. But the poor non blocking, easy to wound the type of impeller, not in pumping with large particles (long fiber) end after the sewage medium.
4. Flow channel type impeller: the impeller is a non blade impeller, the impeller is a flow from the inlet to the outlet of a curved flow. Therefore suitable for pumping large particles and long fibers containing medium. Good blocking resistance. From the performance, the type of impeller efficiency and general closed impeller is not large, but with the type of impeller pump head curve is relatively steep drop. Power curve is relatively stable, it is not easy to generate the problem of super power, but this type of impeller cavitation performance than ordinary closed type impeller, especially suitable for use in the pressure of the pump.
5. Screw centrifugal impeller: the impeller of the blade for the twisted spiral blades, in the conical wheel body from the suction port along the axial extension. The impeller of the pump and the volume of the pump and the role of the centrifugal pump, the suspension of particles in the flow through the pump, do not hit any part of the pump, it is good. The destruction of the conveyor is small. Due to the promotion of the role of helix, suspended particles through strong, so use the type of impeller suitable for pumping large particles and long fibers containing medium, medium and high concentration. Has the obvious characteristic in the situation which has the strict request to the transportation medium destruction.
In terms of performance, the pump has a steep drop head curve, the power curve is relatively flat.
The most common type of pressure water chamber used in the sewage pump is the spiral case, which is used in the internal installation type submersible pump, which is a guide vane of the radial guide vane or the flow passage type. A spiral, spiral ring and intermediate type three. Basically, the spiral spiral case is not used in the sewage pump. Because the structure is simple and easy to manufacture, the annular pressure water chamber is adopted in a small sewage pump. But the application scope of the annular water pressure chamber in the medium type (semi spiral) pressure water chamber is gradually smaller. Because of high efficiency and an intermediate type pressurized water chamber and a spiral pressure chamber of the high permeability of water. Has increasingly been the focus of manufacturers.
