CN2497115Y

CN2497115Y - Piston rod U-shaped sealing device

Info

Publication number: CN2497115Y
Application number: CN 01263244
Authority: CN
Inventors: 张相新; 赵树和
Original assignee: Aoyida Hydraulic & Pneumatic Technology Co Ltd Nanjing
Current assignee: Aoyida Hydraulic & Pneumatic Technology Co Ltd Nanjing
Priority date: 2001-10-16
Filing date: 2001-10-16
Publication date: 2002-06-26
Anticipated expiration: 2011-10-16

Abstract

A piston rod Mu-typed sealing device consists of a cylinder body, a piston rod, a sealing ring and a piston rod end cover. The working surface where the end cover is contacted with the piston rod is provided with a trough of a certain dimension; the interior of the trough is drilled with a plurality of radial small holes of a certain depth; the position corresponding to the working chamber surface is provided with axial small holes; the axial holes and the radial holes are intersectant and communicated with each other; the sealing ring is in cirque shape, with the cross-section in Mu-shaped trough; two ends of the internal end surface of the sealing ring is provided with two half-round convex tables; the Mu-shaped sealing ring is tightly arranged in the trough of the end cover; the Mu-shaped concave trough of the sealing ring forms a chamber with the trough of the end cover. The utility model has the advantages of long service life, convenient installation, impact resistance, and is suitable for the reconstruction to the traditional piston rod sealing devices.

Description

Piston rod μ type seal arrangement

The utility model relates to rod seal technical field in liquid, the Pneumatic Transmission.

Liquid, Pneumatic Transmission are new technologies with respect to mechanical transmission, and liquid, pneumatic cylinder are as the actuator of liquid, Pneumatic Transmission equipment, and its service behaviour and life-span will have a direct impact whole liquid, pneumatic actuator system.Rod seal in liquid, the pneumatic cylinder (anti-leaking) part is the vitals and the main easily damaged parts of cylinder, and its service behaviour and quality are the keys of decision liquid, pneumatic cylinder working efficiency.Adopt O, Y, Yx, V etc. and relevant variations seal ring thereof for metallurgy mostly with the ring-like sealing of the piston rod of linear reciprocating liquid, pneumatic cylinder.Be subjected to constraints such as ring structure, material, installation difficulty,, will lose seal action, leak, under the serious situation liquid, pneumatic cylinder can't be worked thereby cause in case wearing and tearing of seal ring lip or material ageing follow the string.

The purpose of this utility model be exactly to provide a kind of function admirable, long service life, easy for installation, shock-resistant, be applicable to the piston rod μ type seal arrangement that conventional piston rod seal device is transformed.

The technical solution of the utility model is achieved in that a kind of piston rod μ type seal arrangement of being made up of cylinder body, piston rod 1, seal ring, piston rod end cap, be characterized in: end cap 6 and piston rod 1 contacted working surface place have the groove of certain size, groove inside is drilled with the radial hole 5 of several certain depths, with the corresponding position of active chamber face on have axial aperture 2, both intersect, and interconnect; Seal ring 3 is annular seal circles, and its internal diameter is equal to or slightly less than the external diameter of piston rod 1, and its cross section is μ shape groove shape, and two semi-circular boss 7 have been designed at the two ends of end face within it; μ RunddichtringO 3 closely is installed in the groove of end cap 6, and the μ type groove of seal ring 3 and the groove of end cap 6 form a cavity 4.

Because the utility model adopts inner chamber pressure medium compensation μ RunddichtringO, so the utility model utilizes the effect of pressure reduction after wearing and tearing or wearing out, seal ring is expanded to internal diameter direction be close to piston rod, still can continue to use, so long service life; Owing to designed two semi-circular boss at the two ends of μ RunddichtringO interior edge face, just as having added two road O type seal rings, add the self sealing action that self is very strong, make it combine the O type, the advantage of Yx type etc. and variations seal ring thereof, therefore overcome their shortcoming, had good sealing effect, characteristics such as little, easy for installation, high pressure resistant, high temperature resistant, the good operating stability of leaking.The ring-like seal arrangement of traditional piston rod (O, Y, Yx, V etc. and variations thereof) is as long as through after the simple processing, just can be transformed into piston rod μ type seal arrangement of the present utility model.

The utility model is described in further detail below in conjunction with accompanying drawing;

Fig. 1 is a sectional view of the present utility model

Fig. 2 is the sectional view of μ RunddichtringO

Fig. 3 is the A-A sectional view of Fig. 2

μ RunddichtringO 3 among Fig. 1 is annular seal circles, and its cross section is μ shape groove shape, and two semi-circular boss 7 have been designed at the two ends of end face within it; Piston rod end cap 6 and piston rod 1 contacted working surface place have the groove of certain size, and μ RunddichtringO 3 closely is installed in the groove of end cap 6, and the groove of the groove of μ RunddichtringO 3 and end cap 6 forms a cavity 4.Have the radial hole 5 of several certain depths in groove inside, with the corresponding position of active chamber face of liquid, pneumatic cylinder on have axial aperture 2, both intersect, and interconnect.Starting stage, the boss 7 suffered tight power of giving of μ RunddichtringO 3 make it closely contact with piston rod 1, the seal action of piston rod when having reached low-pressure state, continuous increase along with pressure medium, promote piston rod to left movement, this moment, pressure medium also entered in the cavity 4 by axial aperture 2 and radial hole 5, its pressure is close to and equals liquid, pressure in the pneumatic cylinder, under the effect of this pressure, μ RunddichtringO 3 produces deformation and extends and expands, promptly produce the interior edge face (working surface) 8 that compensating action makes μ RunddichtringO 3 and be close to piston rod 1, boss 7 and whole interior edge face 8 are all sealed, and because the effect of pressure also makes the both sides of seal ring 3 be close to groove, the gap disappears, and prevention leaks; Pressure medium is high more, and sealability is just good more.When liquid, when pneumatic cylinder quits work, the pressure in the cavity 4 disappears, and μ RunddichtringO 3 shrinks, and replys original state.

Claims

1. piston rod μ type seal arrangement, form by cylinder body, piston rod (1), seal ring, piston rod end cap, it is characterized in that: described end cap (6) and the contacted working surface of piston rod (1) place have the groove of certain size, groove inside is drilled with the radial hole (5) of several certain depths, with the corresponding position of active chamber face on have axial aperture (2), both intersect, and interconnect; Described seal ring (3) is the annular seal circle, and its internal diameter is equal to or slightly less than the external diameter of piston rod (1), and its cross section is μ shape groove shape, and two semi-circular boss (7) have been designed at the two ends of end face within it; μ RunddichtringO (3) closely is installed in the groove of end cap (6), and the groove of the μ type groove of seal ring (3) and end cap (6) forms a cavity (4).