| 摘要 |
An upstream hole 18 is formed at the upstream end of a detector main body 11 of a liquid flow detector 10 for detecting liquid flow, and a downstream hole 19 is formed at the downstream end, with a liquid flow channel 17 comprising a liquid flow detection channel 17a, discharge channel 17b, and, optionally, intermediate flow channel 17c, being formed between the upstream hole 18 and downstream hole 19. A mobile body 12 which is optionally, spherical, moves with the flow of liquid, and is arranged inside the liquid flow channel 17. The diameter of the liquid flow detection channel 17a is smaller than the diameter of the discharge channel 17b, and the diameter of the mobile body 12 is slightly smaller than the diameter of the liquid flow detection channel 17a. The shape of the peripheral edge part of the upstream hole 18 and the downstream hole 19 is optionally elliptical.
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