CN2509383Y - Reciprocating self-reversing seal piston apparatus - Google Patents

Abstract

The utility model relates to a reciprocating self-reversing seal piston apparatus. The piston is externally provided with a groove. An inter cavity medium pressure compensation sealing circle 3 is tightly arranged in the groove. The inside of the sealing circle and the piston groove form a hollow cavity 4. Piston blocks 2 and 6 are provided a plurality of groups of axial alveolus 8 and 12 and radial alveolus 5 of corresponding communicated hollow cavity 4. Every group of axial alveolus 8 and 12 and the radial alveolus 5 are mutually communicated. The converging place of three holes is provided with a hollow body reversing chamber 9 which is provided with a reversing sealing component 10. The utility model has the advantages of good sealing effect, long service life, convenient installation, high pressure and temperature bearing and good stability.

Description

Reciprocal self-commutation packed-piston device

Technical field

The utility model relates to piston and technical field of sealing technology in liquid, the Pneumatic Transmission.

Background technique

Liquid, pneumatic cylinder are the executive components in liquid, the pneumatic actuator system, are liquid, air-driven key equipment.Piston in liquid, the pneumatic cylinder and Sealing are the main easily damaged partss of liquid, pneumatic cylinder, and its structure and service behaviour directly determine the working efficiency and the operating life of liquid, pneumatic cylinder, play a part very important in whole drive system.Liquid, the present common employing Yx RunddichtringO of pneumatic cylinder to-and-fro motion and O RunddichtringO and relevant variations seal ring thereof.The Yx RunddichtringO is a sealed medium pressure extruding lip compensating type, so the Yx RunddichtringO is the unidirectional seal element.Adopt the sealing form in to-and-fro motion liquid, the pneumatic cylinder, must adopt two Yx RunddichtringOs, the size of piston is just big, the size of liquid, pneumatic cylinder also increases thereupon, and the manufacture cost of entire equipment has also just increased, and Yx RunddichtringO lip is fragile simultaneously is the characteristics decision of its structure itself.The O RunddichtringO produces prestressing force by the extrusion-deformation of when assembling and reaches sealing effect.Its feature is: simple in structure, withstand voltage height, two way sealed, volume are little, but because the movement process wearing and tearing are big, and seal ring distortion back elasticity can not keep well, so working life is short.With the O RunddichtringO is that the other kinds seal ring that base growth is got up is kept away the weakness that causes that elasticity fails in the unavoidable O type circle use equally.

Summary of the invention

The purpose of this utility model is exactly the piston apparatus that will provide a kind of function admirable, reciprocal self-commutation simple in structure, easy for installation, that volume is little to seal, and can replace the reciprocal self-commutation packed-piston device of polymorphic type liquid such as Yx type, O type, pneumatic cylinder.

The technical solution of the utility model is achieved in that a kind of reciprocal self-commutation packed-piston device, by cylinder body, piston, piston rod, seal ring is formed, be characterized in: described piston is to be merged by left piston piece 6 and right piston block 2 to form, have a groove in the piston outer end, the inner cavity medium pressure self compensated RunddichtringO 3 that the two ends lip is two semicircle boss closely is installed in the groove, the inside of seal ring 3 and piston channel form a cavity 4, on piston block 2 and 6, be drilled with some groups of axial aperture 8 and 12 and reach the corresponding radial hole 5 that is communicated with cavity 4, every group of axial aperture 8 and 12 and radial hole 5 interconnect, and be processed with cavity shape commutation chamber 9 at three hole concourses, in commutation chamber 9, be placed with commutation seal element 10.

Owing to realized the automatic reverse sealing, only needed to adopt an inner cavity medium pressure self compensated seal ring can realize the sealing of reciprocating motion of the pistons, so adopt the piston volume of Yx RunddichtringO to reduce greatly.Piston size can satisfy the requirement of the utility model piston apparatus in the liquid of all kinds of seal rings such as former employing O RunddichtringO, the pneumatic cylinder.Because the utility model adopts chamber pressure self compensation seal ring, thus the utility model except that having excellent characteristics own, the excellent characteristics that also kept the inner chamber pressure medium to repay RunddichtringO from happiness.Under the auto-compensation, even when seal ring is aging, because pressure action of medium, the seal ring working surface still can keep contacting with casing wall, so good sealing effect, leakage is little, the life-span is long, easy for installation, high pressure resistant, high temperature resistant, good operating stability etc.Originally use the piston of other type sealing, as long as through after the simple processing, can reforming cost model utility piston apparatus.

Description of drawings

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

Fig. 1 is a cut-away view of the present utility model.

1. piston rods, 2. right piston block 3. inner cavity medium pressure self compensated RunddichtringO 4. cavitys 5. radial holes 6. left piston pieces 7. locking blocks 8. axial aperture commutation chambers 9., 10. commutation seal element 11.O RunddichtringOs, 12. axial aperture among the figure

Embodiment

From Fig. 1 as seen, the piston that is enclosed within on the piston rod 1 is made up of right piston block 2 and 6 merging of left piston piece, ring locking block 7 is contained in the right-hand member of right piston block 2 it is locked, on a left side, O type bar static seal circle 11 is equipped with in the contacting point of right piston block and piston rod 1, have a groove in the piston outer end, the inner cavity medium pressure self compensated RunddichtringO 3 that the two ends lip is two semicircle boss closely is installed in the groove, the inside of seal ring 3 and piston channel form a cavity 4, have some axial aperture 8 on the piston block 2 and 6,12 and respective numbers be communicated with the radial hole 5 of cavity 4; In the commutation chamber 9 that every group of axial aperture 8,12 and radial hole 5 concourses are processed into cylindrical cavity, commutation seal element 10 spherical in shape is placed wherein.When piston rod 1 under the fluid medium pressure effect during to left movement, commutation seal element 10 is being on the port position of axial aperture 12 under the effect of pressure medium, and with its shutoff, and the big more shutoff of pressure medium is tight more.Flowing medium flows in the cavity 4 of the inner cavity medium pressure self compensated RunddichtringO 3 that is the H type by radial hole 5 via axial aperture 8, radial expansion takes place in inner cavity medium pressure self compensated RunddichtringO 3 under the pressure medium effect, make the midfeather of seal ring 3 be close to casing wall, obtained sealing effect admirably.When needs change piston motion direction (change move right from a left side), the mobile direction of flowing medium at first changes direction under systemic effect, the pressure medium direction has changed, commutation seal element 10 is immediately under pressure action of medium, move to the port position of axial aperture 8 by axial aperture 12 places of former working position, and with its shutoff, flowing medium promptly is communicated with the cavity 4 of inner cavity medium pressure self compensated RunddichtringO 3 from axial aperture 12 inflows and via radial hole 5, the pressure medium that has changed direction is delivered to the midfeather of seal ring 3, as seen from the figure, this moment, cavity 4 interior pressure mediums did not almost change, the sealing effect of seal ring 3 maintains a good state always, piston rod 1 then changes direction automatically with the change of pressure medium direction immediately and moves right, and whole commutation process steadily and rapidly.

Claims (1)

1. reciprocal self-commutation packed-piston device, by cylinder body, piston, piston rod, seal ring is formed, it is characterized in that: described piston is to be merged by left piston piece (6) and right piston block (2) to form, have a groove in the piston outer end, the inner cavity medium pressure self compensated RunddichtringO (3) that the two ends lip is two semicircle boss closely is installed in the groove, the inside of seal ring (3) and piston channel form a cavity (4), on piston block (2) and (6), be drilled with some groups of axial aperture (8) and (12) and the corresponding radial hole (5) that is communicated with cavity (4), every group of axial aperture (8) and (12) and radial hole (5) interconnect, and be processed with cavity shape commutation chamber (9) at three hole concourses, in commutation chamber (9), be placed with commutation seal element (10).

Images