Depth-keeping sampling device

The utility model discloses a depth-keeping sampling device, which comprises a shell, the shell comprises a first end and a second end, and the distance between the first end and the second end of the shell is matched with a target sampling depth; the water pump is located in the shell, a water inlet and a water outlet are formed in the water pump, and the water inlet is located at the first end of the shell; the floating body is connected with the second end of the shell to provide buoyancy; the water outlet pipe is connected with a water outlet of the water pump to convey the sample liquid. The device has the advantages that when the water level fluctuates, the distance between the water inlet and the water surface is not changed, and the effect of fixed-depth sampling can be stably achieved. 本申请公开了一种定深采样装置，其包括壳体，包括第一端和第二端，壳体第一端和第二端之间的距离与目标采样深度匹配；水泵，位于所述壳体内，所述水泵上设置有进水口和出水口，进水口位于所述壳体第一端；浮体，与所述壳体第二端连接以提供浮力；出水管，与所述水泵出水口连接以输送样液。本申请具有在水位发生涨落时，进水口与水面之间的距离均不会变化，能够稳定的实现定深采样的效果。