SU1198249A1 - Compressor with contactless piston packing - Google Patents

Abstract

1. COMPRESSOR WITH CONTACTLESS PISTON SEAL, containing cylinder and installed therein with formation of compression chamber piston, moreover, in the wall of the cylinder there is a number groove, a low pressure source and two rows evenly arranged around the circumference of throttle holes connected to the source high pressure, characterized in that, in order to increase the reliability of the centering of the piston, the orifices of the rows are mixed one relative to another in the circumferential direction.

Description

-five

(L

fpus.l

2. The compressor according to claim 1, wherein the angle of displacement of the orifices of a row is determined from the equation

360

Ix

2- p 3-5 - number of holes

P

in every r d d.

Compressor pop. 1, distinguished by the fact that the rows of openings are more active than others.

defined equation

one;

E (0..5Lb

2n

D

piston diameter;

de

L is the distance from the piston face opposite to the compression chamber to the annular groove at the location of the piston at the top dead center.

The invention relates to a compressor and concerns compressors with a non-contact piston seal.

The purpose of the invention is to increase the reliability of piston centering.

1 schematically shows the proposed compressor with a non-contact piston seal, longitudinal section; figure 2 - section aa in figure 1; figure 3 - section bb in figure 2.

A compressor with a contactless piston seal contains a cylinder 1 and a piston 3 mounted therein to form chamber 2 of compression, in the wall 4 of cylinder 1 there is an annular groove 5 connected to a low pressure source (not shown) and two rows 6 and 7 evenly spaced around the circumference throttle holes 8 and 9 connected to a high pressure source (not shown).

In this case, the holes 8 and 9 of rows 6 and 7 are displaced relative to each other in the circumferential direction, and the angle of displacement of the holes 8 and 9 of rows 6 and 7 is determined from the equation

/ 360 ° T

where n 3-5 is the number of holes 8 or 9 in each of rows 6 and 7.

A number 6 and 7 of holes 8 and 9 are spaced from each other at a distance f defined by equation

-ilE.

t (0.15 L),

L 2. P

where is the diameter of the piston 3. L is the distance from the end

10 piston 3, opposite the compression chamber 2, to the annular groove 5 at the location of the piston 3 at the top dead center.

The piston 3 is placed in the cylinder 1 with an annular gap 11.

The compressor with a contactless piston seal works as follows.

During reciprocating movement of the piston 3 in the cylinder 1, the gas is alternately sucked into the compression chamber 2 and subsequently pumped to the consumer. The groove 5 connected to the low pressure source limits the effect of alternating pressure from the compression chamber 2 on the pressure in the gap 11 and the gas is injected into the gap 11 through the openings 8 and 9 of rows 6 and 7. The gas is expelled from the openings 8 and 9 towards the lower pressure, i.e. ring groove 5 on the one hand and podporshnevoe space on the other.

The offset of the holes 8 p yes 6 relative to the holes 9 p yes 7 at an angle

determined by equation

where n is the number of holes 8 or 9 in each of the rows of 6 or

7 о provides for an increase in the total pressure in the gap both along the circumference in each of the rows 8 or 9, and along the forming piston 3.

compressor with a contactless piston seal allows an increase. the pressure in the gap between the piston and

sealing gas and thereby increase the reliability of the centering of the compressor piston.

ag.g

Claims (3)

1. A COMPRESSOR WITH A CONTACTLESS PISTON SEAL, comprising a cylinder and a piston mounted therein to form a compression chamber, wherein an annular groove is made in the cylinder wall, connected to a low pressure source and two rows evenly spaced around the throttle apertures connected to a high pressure source characterized in that, in order to increase the reliability of the centering of the piston, the openings of the rows are offset relative to each other in the circumferential direction. ' FIG. 1 2. The compressor according to claim 1, with the fact that the angle of displacement of the holes of the rows is determined from the equation where η = 3 - 5 is the number of holes in each row. 3. The compressor according to claim 1, with the fact that the rows of holes are lined with respect to the other at a distance B determined from the equation where A is the piston diameter; L is the distance from the end face of the piston opposite the compression chamber to the annular groove when the piston is located at top dead center.