| 摘要 |
Provided is a shot pump (100) including a cylinder (101), a piston (102), an inlet (103) and an outlet (104). The inlet (103) is provided on the side of the cylinder (101) facing a tip end of the piston (102) while the outlet (104) is provided on the side of the cylinder (101) at a root of the piston (102). The clearance (δ) is provided between outer periphery (102s) of the piston (102) and inner periphery (101s) of the cylinder (101), which clearance has a width at a ratio of 1/50 to 2 to the outside diameter of the piston (102). In addition, the piston (102) reciprocates between the two end portions of the cylinder (101), so that the substance to be transferred is sucked from the inlet (103), is then caused to pass through the clearance (δ) between the outer periphery (102s) of the piston (102) and the inner periphery (101s) of the cylinder (101), and is consequently discharged from the outlet (104). Accordingly, it is possible to provide a shot pump (3, 4) which makes it possible to prevent a substance to be transferred from remaining in the pump, and to thus prevent gelation of the substance associated with the remaining, while securing the constant discharge performance, and which can thus be used over a long period of time with no maintenance, and to provide a control device (18) in a variable-speed-type two-liquid metering and mixing apparatus using the shot pump.
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