Ultrahigh-pressure sealing device and reciprocating pump

摘要

An ultrahigh-pressure sealing device improves sealing performance under ultrahigh pressures and improves durability. The ultrahigh-pressure sealing device is arranged to seal an annular space between an outer member and an inner member and separates between a high-pressure chamber and a low-pressure chamber. A bottom ring includes a first inner periphery, a first large-diameter outer periphery, a first small-diameter outer periphery, and a first middle outer periphery. A back-up ring includes a second inner periphery, a second engagement portion, and a second outer periphery. A packing ring includes a third low-pressure-chamber end, a third inner periphery, a third large-diameter outer periphery, a third the small-diameter outer periphery, and a third middle outer periphery. An elastic ring includes a fourth inner periphery, a fourth the engagement portion, and a fourth outer periphery.

主权项

1. An ultrahigh-pressure sealing device mountable in an annular space between an outer member and an inner member to seal the annular space and to separate between a high-pressure chamber and a low-pressure chamber, the sealing device comprising:
a bottom ring including
a first low-pressure-chamber end nearer the low-pressure chamber, and a first high-pressure-chamber end nearer the high-pressure chamber,a first inner periphery coming in contact with the inner member,a first large-diameter outer periphery connecting to the first low-pressure-chamber end, and coming in contact with the outer member,a first small-diameter outer periphery having a smaller diameter than the first large-diameter outer periphery, and connecting to the first high-pressure-chamber end,a first middle outer periphery connecting the first large-diameter outer periphery and the first small-diameter outer periphery; a back-up ring including
a second high-pressure-chamber end nearer the high-pressure chamber,a second inner periphery mounted on the first small-diameter outer periphery and in contact with the first small-diameter outer periphery,a second engagement portion engaged with the first middle outer periphery to restrict movement in an axial direction,a second outer periphery coming in contact with the outer member; a packing ring including
a third low-pressure-chamber end nearer the low-pressure chamber, and in contact with the second high-pressure-chamber end,a third high-pressure-chamber end nearer the high-pressure chamber,a third inner periphery coming in contact with the inner member,a third large-diameter outer periphery connecting to the third low-pressure-chamber end, and coming in contact with the outer member,a third small-diameter outer periphery having a smaller diameter than the third large-diameter outer periphery, and connecting to the third high-pressure-chamber end,a third middle outer periphery connecting the third large-diameter outer periphery and the third small-diameter outer periphery; and an elastic ring including
a fourth inner periphery mounted on the third small-diameter outer periphery and in contact with the third small-diameter outer periphery,a fourth engagement portion engaged with the third middle outer periphery to restrict movement in the axial direction, anda fourth outer periphery coming in contact with the outer member.