Dual-purpose self-priming pump for sprinkler irrigation and drip irrigation

Abstract

The invention discloses a dual-purpose self-priming pump for sprinkler irrigation and drip irrigation. The dual-purpose self-priming pump for the sprinkler irrigation and the drip irrigation comprises two outlet flanges for grading operation so as to improve the overall running efficiency at two different operating points and meet an irrigation demand under water demand conditions of multiple crops and a low-energy consumption running requirement in the prior art. The two-grade self-priming pump for the grading operation adopts the scheme as follows: when water is drained from a primary flange, a primary impeller runs at a high-efficiency point and a secondary impeller shut-off point is relatively low in lift and relatively small in energy loss, so that the self-priming pump runs efficiently, with eta of about 55%; when water is drained from a secondary flange, the primary impeller runs near the high-efficiency point and the secondary impeller runs at the high-efficiency point, so that the self-priming pump runs efficiently, with eta of about 65%; and the self-priming pump for the grading operation is relatively high in overall efficiency, with eta of about 60%, and can be widely applied to the irrigation under the water demand conditions of the multiple crops.

Description

Technical field [0001] The invention belongs to a water pumping device, which is suitable for multiple working conditions of spray irrigation and drip irrigation and low energy consumption operation requirements. Background technique [0002] Usually light and small self-priming pumps are equipped with movable non-electric prime movers, which can be moved conveniently with the location of the water source. Therefore, it is widely used in the vast plains and remote areas. At present, with the diversification of crop planting, different irrigation methods are required to meet the requirements of low energy consumption operation. [0003] The design parameter is the sprinkler irrigation condition Q 1 =15m 3 / h, H 1 =30m, drip irrigation condition Q 2 =18m 3 / h, H 2 =20m, the time ratio of sprinkler irrigation and drip irrigation is taken as α=1. In the vane pump design so far, the classic model conversion method and velocity coefficient method are still the most effecti...

AI Technical Summary

Problems solved by technology

Although the concept of multi-working condition design has been proposed for more than ten years, there is still not enough design information and data for reference

Pump design is a kind of compromise design. Sometimes in order to meet a specific requirement, other aspects of performance have to be sacrificed. Therefore, a general form of multi-working condition design method is adopted to design a single-stage pump at two different working condition points. The overall efficiency of low-voltage operation is also low η≈30%, which obviously cannot meet the requirements of multi-working conditions and low energy consumption operation

[0005] In the prior art, the single-stage self-priming pump obtained by the single working condition point design method and the multi-working condition design method has a low overall efficiency η≈30%, which cannot meet the existing irrigation conditions based on the water demand of various crops. Demand and Low Energy Operation Requirements

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