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一、双喷嘴射流泵在动水位较深（45米）孔径168毫米水量较小的水文孔中，采用自制的双喷嘴射流泵抽水，经过多次试验取得一定成果。在相同的动水位，比单喷嘴泵抽水量有显著提高。从而克服了缺少空气压缩机等抽水设备不足的状况，并为在中深动水位、小出水量的抽水试验，开辟了途径。（一）工作原理：见图1。由喷嘴射入承喷器（喉管）的高压射流束，根据水力学原理，在承喷器（喉管）外口形成负压区，这样钻孔里的水即从外部流入承喷器（喉管）内。
First, the double jet nozzle jet in the deep water level (45 meters) aperture 168 mm smaller hydrological hole, the use of self-jet nozzle jet pump, after several tests to achieve some results. In the same level, than the single-nozzle pump pumping significantly increased. Thus overcoming the lack of lack of air compressors and other pumping equipment conditions, and in the deep water level, small water pumping test, opened up the way. (A) The working principle: See Figure 1. The jet of high-pressure jet injected into the blast nozzle (throat) by the nozzle, according to the principle of hydraulics, forms a negative pressure zone at the outlet of the jet (throat) so that the water in the drilled hole flows into the jet from the outside Throat).