SU1520257A1 - Piston compressor and method of operating same - Google Patents

Abstract

The invention can be used in single-stage reciprocating compressors using gas from two different potential sources. The purpose of the invention is to increase the efficiency of the compressor by more fully utilizing the energy of the make-up gas. Cylinder 1 is sealed by a cap 2 with a low pressure suction valve (K) 3. High pressure K 4 is installed in cylinder 1 to form working cavity 5. Piston 6 with rod 7 is connected to drive shaft 8. Highway gas 9 is connected to cavity 5 through a window in cylinder wall 1. In line 9, K 10 is installed. Drive K 10 is made in the form of a cam 11 fixed on shaft 8 and interacting with K 10 by means of rod 12. The make-up gas starts to be supplied when the gas expanding from the dead space reaches a pressure equal to the make-up gas pressure. The suction of the low pressure gas is carried out after the expansion of the feed gas. 2 Il.

Description

one

(21) ii0852i 2 / 25-29

(22) 03.07. В6

(C6) 11/07/89. Bul № k (75) V.M. Shleinikov (53) 621.512 (088.8)

(56) Rosenfeld L, M., Tkachev AG . Refrigerating machines and devices. - M., I960, p.226, fig. Qk.

(k) METHOD OF WORK OF PISTON COMPRESSOR AND PISTON COMPRESSOR

(57) The invention may be used in single-stage piston compressors using gas from two different potential sources. The purpose of the invention is to increase the efficiency of the compressor by more fully utilizing the energy of the make-up gas. Cylinder 1 sealed

a cap 2 with a suction valve (K) 3 of low pressure. A high pressure injection K f is installed in cylinder 1 to form working cavity 5. Piston 6 with rod 7 is connected to drive shaft 8, Highway 9 gas is connected to cavity 5 through a window in cylinder wall 1. In line 9, K 10 is installed. The drive K 10 is made in the form of a cam 11 fixed on the shaft 8 and interacting with K 10 by means of the rod 12. The make-up gas is started to flow when the gas expanding from the dead space reaches a pressure equal to the make-up gas pressure. The suction of the low pressure gas is carried out after the expansion of the feed gas. 2 sec. f-ly, 2 ill.

(L

in n

K) SP

-sj

The invention relates to the field of compressor engineering and can be used in single-stage reciprocating compressors using gas from two different potential gas sources to compress gas.

The purpose of the invention is to increase efficiency by more fully utilizing the energy of a medium-pressure gas.

FIG. 1 shows the proposed compressor; in fig. 2 - indicator diagram of the operation of the proposed compressor.

The piston compressor contains a cylinder 1 compacted by a cap 2 with a low pressure suction valve 3 and a high pressure discharge valve C installed in cylinder 1 to form a working cavity 5, a piston 6 with a rod 7 connected to the drive shaft 8, make-up gas line 9 communicated with the working cavity 5 of cylinder 1 through a window (not shown) in the wall of cylinder 1.

In line 9-make-up, a control valve 10 is installed. In this case, the place for making a window in the working lanes

These 5 are preferably selected at the point at which the gas pressure expanding from the dead space drops to the gas pressure in the medium pressure line 9. The valve 10 can be controlled by a cam 11 located on the drive shaft 8 by means of a rod 12 connecting the valve 10 with the cam 11.

FIG. 2 denotes a theoretical cycle of a single-stage compressor — points, a, b, c, d, and points f, e, q denote respectively the points at which the medium pressure starts to flow, stop and end the expansion of the medium-pressure gas to the low-pressure gas.

The compressor operates as follows.

When piston 6 moves from TDC (point c) to NMT (point a),

gas expansion from the dead space of the cavity 5. When the gas expanding pressure is equal to the gas pressure in the feed line 9 (point f), the valve 10 is opened and the feed gas is injected. In this case, the portion of the make-up gas entering the cavity 5 is determined by design, based on the specific operating conditions of the compressor (for example, limited

x with

to

15

20 . 25

thirty

 ,

40

t50

55

average gas supply per compressor cycle).

At the design point, valve 10 is closed (point e) and the incoming gas is expanded to a low pressure value (point q), upon reaching which valve 3 is opened and the low pressure gas is filled with low pressure before the piston arrives at BDC (point a). Next, the gas is compressed and heated (points b and c). In the following, the process is repeated.

Due to the fact that the flow of feed gas into the working cavity 5 occurs at the moment when the pressure in it corresponds to the pressure of this gas, there is no energy loss associated with gas throttling, and the potential energy of the gas is used to drive the compressor.

Claims (2)

1. A method of operating a piston compressor, including gas expansion from a dead space, low pressure gas intake, feed gas supply to the compressor cylinder, compression and gas injection, characterized in that in order to increase efficiency by more fully using gas energy recharge, recharge gas begin to be supplied when the expansion gas from the dead space reaches a pressure equal to the pressure of recharge gas, and low pressure gas is sucked in after recharge gas is expanded. 2. A piston compressor comprising a cylinder sealed with a cap, with a low pressure suction valve and a high pressure discharge valve installed in the cylinder to form a working cavity, a piston with a rod connected to the drive shaft, and a make-up gas line connected to the cylinder cavity through a window in the cylinder wall, characterized in that, in order to increase efficiency by fully utilizing the energy of the make-up gas, it is equipped with a valve, installed in the gas main make-up, and its drive, made in the form of a cam mounted on the drive shaft and interacting with the valve through the rod.