Trigger sprayer
[Object] To provide a trigger sprayer excellent in ejection responsiveness and ejection stability. [Solution] The present invention is directed to a trigger sprayer 100 having a base body 10 having a main cylinder portion 2 and a sub-cylinder portion 3 which can store liquid, a piston portion 20 slidable along an inner wall of the main cylinder portion 2 , a trigger 30 for sliding the piston portion 20 , a first valve V 1 which opens and closes in accordance with pressure inside the main cylinder portion 2 , and a second valve V 2 which opens and closes in accordance with pressure of the liquid, the second valve V 2 having a second valve piston portion 11 a slidable along an inner wall 3 a of the sub-cylinder portion 3 and an inverted-dome-shaped dome spring portion 11 b for pressing the second valve piston portion 11 a , and the dome spring portion 11 b being elastically deformable.
1 . A trigger sprayer for suctioning up liquid in a container for ejection, the trigger sprayer comprising:
a base body having a first flow path where the liquid flows, a main cylinder portion communicated with the first flow path to be able to store the liquid, a second flow path communicated with the main cylinder portion, a sub-cylinder portion communicated with the second flow path, a third flow path communicated with the sub-cylinder portion, and a nozzle portion provided at a tip of the third flow path;
a piston portion slidable along an inner wall of the main cylinder portion;
a trigger coupled to the piston portion to slide the piston portion;
a first valve which opens and closes between the first flow path and the main cylinder portion and between the main cylinder portion and the second flow path in accordance with pressure inside the main cylinder portion; and
a second valve which opens and closes between the second flow path and the sub-cylinder portion and between the sub-cylinder portion and the third flow path in accordance with pressure of the flowing liquid,
the second valve having
a second valve piston portion that is configured to slide upward and downward along an inner wall of the sub-cylinder portion, and
an inverted-dome-shaped dome spring portion for pressing the second valve piston portion, and
the dome spring portion being elastically deformable,
an inner diameter of the inner wall of the sub-cylinder portion is constant in a direction along which the second valve piston portion slides, and
the second valve piston portion has an outer skirt portion abutting on the inner wall of the sub-cylinder portion and an inner skirt portion abutting on the inner wall of the sub-cylinder portion at a portion lower than the outer skirt portion,
a diameter of the outer skirt portion and a diameter of the inner skirt portion are equal such that leading edges of the outer skirt portion and the inner skirt portions are always in contact with the inner wall of the sub-cylinder portion while the second valve piston portion slides, and
with the second valve piston portion sliding, a gap occurs between the inner wall of the sub-cylinder portion and the inner skirt portion, and the liquid flows via the gap from the second flow path to between the outer skirt portion and the inner skirt portion, and the third flow path;
wherein a diameter of the dome spring portion is larger than a diameter of the second valve piston portion; and
a cover body attached to the base body so as to cover at least the second flow path, the sub-cylinder portion, and the third flow path, wherein the cover body is provided with a support wall surface where the dome spring portion abuts.
2 . The trigger sprayer according to claim 1 , wherein
the second valve is arranged above the main cylinder portion.
3 . The trigger sprayer according to claim 1 , wherein
a plurality of groove portions is provided in the inner wall of the sub-cylinder portion, and
when the second valve is opened, the liquid flows from the second flow path via the groove portions to the third flow path.
4 . The trigger sprayer according to claim 3 , wherein
each of the groove portions has a vertically elongated shape, and the groove portions are provided so as to be regularly spaced in a circumferential direction.