PURPOSE: To obtain a pump device having pump transporting function with a simple structure by providing seal system having one-way valve function in two or more axially separate positions, the constitution being such that the gas flowing directions are reversed to each other, and the axially right- angled sectional areas of the seal parts are differed to each other.
CONSTITUTION: A first seal system 5 is formed of a circumferential channel 51 formed on the outer circumferential wall of a piston body 2 and a ring member fitted to the circumferential channel 51. In contrast to the first seal system 5, a second seal system 9 has a circumferential channel 91 formed on the end wall part inner circumferential wall of a cylinder member 1, and a ring member is fitted to the circumferential channel 91. When the piston member is moved in the right direction shown in the drawing, the first seal system 5 prevents the outflow of a gas from a high pressure side space 11 to a low pressure side space 12, and the second seal system 9 increases the pressure A in the space 11 while suppressing the gas leak from a high pressure side compression gas tank 10 to the low pressure side space 11. Thus, the combination of two seal systems having one-way valve function enhances reduction in size weight, and cost.
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TODA FUJIO
MATSUO MASAHIRO
TODA FUJIO
MATSUO MASAHIRO