RU2266452C2 - Piston seal - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: piston seal comprises piston ring, several expander, and spiral compression springs that are arranged in the piston groove. The expander spiral springs are mounted in the locking pipes radially arranged inside the piston. One end of the springs is secured to the projection of the core arranged at the longitudinal axis of the piston. The other end is secured to the inner projection of the pusher. The free end of the pusher passes through the opening in the piston groove for permitting transmitting effort from the spiral spring to the piston ring and pressing it to the wall of the cylinder.

EFFECT: improved pressure-tightness.

1 dwg

Description

This invention is proposed to be used in reciprocating machines: engines, compressors, pumps, expanders.

The closest known analogues to the author of the application is the invention, patented as 624035, date of publication - 03.08.1978. In this invention, coil springs are also used to expand the piston ring. The disadvantages of this invention are:

- the difficulty of fixing the springs in the piston groove;

- use only for fluoroplastic rings;

- the need for longitudinal grooves between the piston grooves.

The tasks solved by the claimed invention:

- increase the service life of parts such as cylinder liners and piston compression and oil scraper rings,

- reduction of labor costs for repairs,

- a more tight piston seal in the cylinder,

- reduction of losses of compressible or expandable material from leaks through leaks between the rings and the cylinder,

- reducing the consumption of spare parts such as piston, compression and oil scraper, rings and cylinder liners,

- more reliable fixation of the ring in the piston groove.

The essence of the invention lies in the fact that the piston seal containing the piston ring and several expander, coil springs operating in compression in the piston groove, characterized in that the expander, coil springs are placed in fixing tubes radially located inside the piston and worn at one end on the radial protrusion of the core located on the longitudinal axis of the piston, and the other end on the inner protrusion of the pusher, which passes its free end through the through hole in the piston groove with the possibility of The force transfer from the spiral spring to the piston ring and pressing it against the cylinder wall allows the use of more powerful springs as an expander to seal the piston, it is more reliable to fix the ring in the groove from axial and longitudinal displacement, to increase the service life of the cylinder liner and piston, compression and oil rings , reduce leakage from the compression cavity through leaks between the cylinder and the piston ring.

The invention is illustrated in the drawing, which shows a piston seal in section.

The piston seal contains a piston ring 5, several expander, coil springs 6, working in compression in the groove 4 of the piston. Expander, coil springs 6 are placed in the fixing tubes 7, radially located inside the piston and worn at one end on the radial protrusion of the core 8, located on the longitudinal axis of the piston, and the other end on the inner protrusion of the pusher 9, which passes its free end through the through hole 3 in groove 4 of the piston with the possibility of transmitting forces from the coil spring 6 to the piston ring 5 and pressing it against the wall of the cylinder 1.

The invention works as follows: inside the piston, on its longitudinal axis, there is one core for a group of rings or several, one for each ring, core 8 with radially arranged protrusions.

A fixing tube 7 is put on one protrusion at one end. The other end of the tube is worn on the inner protrusion of the pusher 9. Inside the tube 7 there is a compression coil 6, resting at one end on the radial protrusion of the core 8, and the other end on the inner protrusion of the pusher 9. The pusher 9 on the opposite side has a protrusion passing through the through hole 3 in the piston groove 4. With its free end, this protrusion abuts the piston ring 5, pressing it against the wall of the cylinder 1, thereby providing a more dense Contents of the piston ring 5 to the cylinder liner 1.

The essential features of the invention are:

- the location of the expander, as such, inside the piston,

- the use of an intermediate link, a pusher, between the spring and the ring,

- the use of the tube as an element fixing the position of the spring expander,

- the possibility of using the present invention for both compression and oil scraper rings, regardless of the material from which they are made. The application of the claimed invention is possible in a wide variety of piston machines: expanders, engines, compressors, pumps.

The application of the invention allows:

- increase the service life of the cylinder liner and piston, compression and oil rings,

- provide a more tight seal of the piston,

- reduce the consumption of spare parts such as cylinder liners and piston, compression and oil scraper rings, reduce labor costs for repairs.

Claims (1)

A piston seal comprising a piston ring, several expander spiral springs operating in compression in a piston groove, characterized in that the expander spiral springs are arranged in fixing tubes radially located inside the piston and worn at one end on a radial protrusion of a core located on the longitudinal axis of the piston, and the other end - on the inner protrusion of the pusher, which passes the free end through the through hole in the piston groove with the possibility of transmitting force from the coil spring to the piston th ring and pressing it to the cylinder wall.