| CPC F04B 43/09 (2013.01) [F04B 11/0091 (2013.01); F04B 43/1253 (2013.01); F04B 53/16 (2013.01); F04B 2201/08 (2013.01)] | 5 Claims |
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1. A tube pump comprising:
a tube with flexibility,
a housing unit that has an inner peripheral surface, which is formed in an arc shape around an axis, along which the tube is disposed, and that is opened toward one end side along the axis;
a pair of roller units that are accommodated in the housing unit and rotate about the axis in a state in which the tube is blocked;
a pair of drive units that cause each of the pair of roller units to rotate about the axis in the same direction;
a cover member that is disposed in the housing unit such that the cover member covers the pair of roller units and provides an annular opening region into which the tube is able to be inserted toward the inner peripheral surface, the cover member being a member formed to have a circular plan view of a first radius around the axis; and
a lid unit that is able to switch between a closed state in which the housing unit is covered and an opened state in which the lid unit is separated from the housing unit, the lid unit including a recessed portion that accommodates the cover member in the closed state and a projecting portion that is formed in an annular shape such that the projecting portion projects toward the opening region, wherein
the inner peripheral surface is an arc-shaped surface disposed along a circle with a second radius around the axis, the tube being disposed along the inner peripheral surface, the second radius being larger than the first radius,
an outer diameter of the tube in a natural state is smaller than a difference obtained by subtracting the first radius from the second radius, the pair of roller units do not come into contact with the tube in the natural state,
the annular opening region having an opening width same as the difference obtained by subtracting the first radius from the second radius around an entire annular opening region except for a tubing entrance part and a tubing exit part, and
the projecting portion extends in the annular opening region along the inner peripheral surface of the housing unit in a case in which the lid unit is brought into the closed state so as to cooperate with the housing unit to form a groove portion that accommodates the tube.
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