SU883549A1 - Compressor - Google Patents

Description

I

This invention relates to a compressor industry and a casa compressor compressor with a contactless piston seal.

Closest to the invention to the technical essence and the achieved result is a compressor with a contactless piston seal, comprising a cylinder with a sleeve and a piston installed in the latter, having a lateral surface serving as an aerostatic bearing, fed through throttle openings in the sleeve, communicated with pressure source l.

The disadvantage of this compressor is low centering rigidity — when inertial loads are applied to the compressor.

The purpose of the invention is to increase the rigidity of the centering when inertial forces are applied to the piston.

This goal is achieved by the fact that in the compressor cylinder coaxially throttle holes are made

ring groove and in the latter installed spring-loaded ring,

forming a throttled gap with the outer surface of the liner. The drawing shows schematically the proposed compressor, a longitudinal section.

A compressor with a contactless piston seal contains a cylinder I with sleeves 2 and a piston 3 installed in the last, having a lateral surface serving as an aerostatic bearing, fed through throttle bores 4 made in the sleeve 2 and communicated with the source

15 pressure (not shown) wherein in the cylinder 1 coaxially the throttle holes 4 are filled with an annular groove 5 and the latter 7 has a ring 7 which is compressed by a spring 6 and forms a throttling gap 8 with the outer surface of the sleeve 2.

The compressor works as follows.,

With the reciprocating movement of the piston 3, the gas is sucked into the cylinder 1, compressed in it and injected into the consumer. At the same time, the gas from an external source of pressure Or from the discharge line of the compressor itself enters the throttle gap B, which, in the absence of inertial load, has the same value in all radial directions and then through apertures 4 it flows to the aerostatic charge

bearing, creating a carrier gas (loA, preventing contact of the piston 3 with the liner 2. The size of the gap 8 and the diameter of the throttle holes 4 are selected based on the condition of ensuring compressor operability with minimum gas losses per centering and minimum leaks.

When acting on the piston 3 by inertial forces, for example, from left to right, the piston 3 moves to the right. Together with the piston 3, the ring 7 also moves, compressing the spring 6. At the same time, the gap 8 on the right increases, its resistance drops, which provides an increase in the gas flow through the throttle bores 4 on the right. At the same time, the gas flow on the left side of the piston 3 decreases as the gap 8 on the left decreases and the resistance to gas flow through it increases. Increasing the gas flow from the right speed of the piston 3 leads to an increase in pressure in this part of the gap. On the left side of the piston 3, the opposite occurs. An additional pressure difference arises that keeps piston 3 from contacting the liner 2 with the mirror. The greater the inertial force, the greater the size of the gap 8 changes. At the same time, the total gas flow consumed to center the piston 3 remains almost unchanged, since gas flow through the throttle holes 4 on one side of the piston 3 is accompanied by its decrease on the opposite side, and with a certain stiffness of the spring 6, changes in flow rates from the loaded and unloaded side of the piston 3 provide vayut its concentric position in the sleeve 2, regardless of the magnitude of inertial load, which reduces the leakage.

Thus, making the annular groove coaxially the throttle holes 15 in the cylinder and installing the throttle clearance in the last subsurface ring, which forms the throttle clearance with the outer surface of the liner, makes it possible to increase the rigidity of the centering. 20 when subjected to inertial forces on the piston.

Claims (1)

Invention Formula Compressor with a contactless piston seal, containing a cylinder with a sleeve and a piston installed in the latter, having a lateral surface serving as an aerostatic bearing, fed through throttle bores in the sleeve, communicated with a pressure source, so as to increase the rigidity of the centering when an inertial force is applied to the piston, an annular groove is made in the cylinder coaxially with throttle holes, and a spring-loaded ring is installed in the cylinder, The throttle clearance with the outer surface of the sleeve. Sources of information taken into account in the examination 1. Swiss patent 359507, cl. 27in 17, published. 1962.