RU2633473C2 - Multicylinder free-piston engine-compressor unit - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: free-piston engine-compressor unit consists of 2-12 cylinder blocks mounted on a common base plate (1). Blocks contain one cylinder of two-stroke internal combustion engine (2) and piston compressor (3). Center lines of cylinder blocks are parallel to each other and perpendicular to the plane of the common base plate. Pistons of all the blocks are interconnected by timing mechanism (4). The timing mechanism comprises crossheads (22) positioned in the guides of the common base plate (25) coaxially to the cylinders of the engine and the compressor, with rigidly attached engine rods of the engine (23) and the compressor (24) to them, racks (26) are cut on the side surface of the crossheads from the direction of adjacent cylinder blocks, which engage with ring gears of rockers (27) positioned between the crossheads. Rocker number is one less than the cylinder block number.

EFFECT: improved device operation reliability.

3 cl, 6 dwg

Description

The invention relates to engine building and can be used to create multi-cylinder motor compressors with free-moving pistons.

The closest in technical essence is the free-piston motor compressor Eremenko (RF patent No. 2367803, F02B 71/00, 2006-01), which consists of 2-12 cylinder blocks mounted on a common frame. The blocks contain one cylinder of a two-stroke internal combustion engine and reciprocating compressor. The axial lines of the cylinder blocks are parallel to each other and perpendicular to the cavity of the common frame.

The pistons of all blocks are interconnected by a synchronization mechanism.

The synchronization mechanism contains rods rigidly connecting the pistons of the engine and the compressor with travers pivotally mounted on them. Two gear racks are pivotally attached to the traverses. The synchronizer gears are placed between the cylinder blocks and mounted on a common frame. Each gear engages with two gear racks of two adjacent blocks, and the number of gears is equal to the number of cylinder blocks.

The disadvantage of this motor compressor is the relative complexity of the synchronization mechanism.

The objective of the present invention is to simplify the synchronization mechanism and, as a result, increase its reliability.

To solve this problem, a multi-cylinder free-piston motor compressor has been proposed, consisting of 2-12 cylinder blocks mounted on a common frame and containing one cylinder of a two-stroke piston internal combustion engine and reciprocating compressor. The axial lines of the cylinder blocks are parallel to each other and perpendicular to the plane of the common frame. The pistons of all blocks are interconnected by a synchronization mechanism.

The synchronization mechanism consists of crossheads installed in guides inside the common frame coaxially with the engine and compressor cylinders, which absorb axial and radial loads. Crosshead dimensions should provide allowable specific pressures for selected friction pairs.

The crossheads of the pistons of the engine and compressor are rigidly attached to the crossheads.

On the lateral surfaces of the crossheads from the side of adjacent cylinders, gear racks are cut, which engage with gear crowns at the ends of the rocker arms located between the crossheads.

Engines can be gasoline, or gas, or gas with injection of liquid ignition fuel, or diesel, and reciprocating compressors (hereinafter referred to as compressors) can be single-stage or multi-stage with single or double acting pistons, as well as with differential pistons.

The cooling of the engine and compressor cylinders can be liquid, or air, or combined.

In FIG. 1 shows two cylinder blocks and a synchronization mechanism. In FIG. 2 is a plan view of a motor compressor containing 12 cylinder blocks arranged in two rows. In FIG. 3 is a plan view of a motor compressor comprising 6 cylinder blocks arranged in a single row. In FIG. 4 is a plan view of a motor compressor containing 6 cylinder blocks arranged along a curved line (for example, a circle). In FIG. 5 shows a crosshead with connected piston rods of the engine and compressor and a gear rack cut on the side surface. In FIG. 6 shows a beam with gear rims at the ends.

In FIG. 1, cylinder blocks consisting of a cylinder of an engine 2 and a cylinder of a compressor 3, as well as a synchronization mechanism 4 are fixed on a common frame 1.

In the upper part of the engine cylinder there is a combustion chamber 5, a glow plug 6 for igniting a combustible mixture or a nozzle 7 for fuel injection, and also a valve 8 for supplying compressed air when starting the engine. A piston 9 is located in the cylindrical part. At the bottom of the engine cylinder there is a purge pump chamber 10, a suction valve 11, and a sealing device 12.

The engine cylinder also has inlet pipes 13, exhaust pipes 14 and purge windows 15 and 16 connected to the lower cavity of the cylinder by a channel 17.

The compressor cylinder has suction valves 18, pressure valves 19 and a sealing device 20. A piston 21 is located in the cylindrical part.

The synchronization mechanism consists of crossheads 22, piston rods of engine cylinders 23 and compressor cylinders rigidly fixed on them. Crossheads are replaced in guides 25 in a common frame. On the lateral surface of the crossheads, from the side of adjacent cylinder blocks, gear racks 26 are cut, which engage with the gear crowns of the rocker arm 27 located between the crossheads and rotating on the axis 28.

The multi-cylinder free piston motor compressor operates as follows:

- the engine is started by supplying compressed air through valve 8 to the cylinders of the engines whose pistons are at top dead center;

- when the piston of the engine 9 moves to the top dead center, a vacuum forms in the chamber of the purge pump 10 and the intake of the combustible mixture or air occurs through the inlet valve 11 or the inlet pipe 13;

- when the engine piston moves to the top dead center in the combustion chamber, compression occurs and near the top dead center voltage is applied to the spark plug 6 or fuel injection through the nozzle 7, there is a flash and the engine piston makes an operating input. At this time, under the engine piston in the chamber of the purge pump 10, fresh combustible mixture or air is compressed when the exhaust windows 14, purge windows 15 and 16, and channel 17 are opened, the engine cylinder is exhausted, purged and charged with fresh combustible mixture or air;

- if the cylinder blocks are conventionally numbered, then the even and odd pistons of the engine make a working stroke alternately.

When the piston of the compressor 21 moves in the cylinder 3, gas is sucked through the suction valves 18, compression and discharge through the discharge valves 19.

The proposed technical solution is simple in design and highly efficient, since a multi-cylinder free-piston motor compressor, depending on the required performance and discharge pressure, may contain the required number of cylinder blocks.

The multi-cylinder free-piston motor compressor occupies the smallest possible plan area, since the cylinder blocks are perpendicular to the plane of the common frame, and can be dynamically fully balanced and not require a foundation.

Claims (3)

1. A multi-cylinder free-piston compressor comprising cylinders of a two-stroke internal combustion engine and a reciprocating compressor, a device for supplying fuel to the engine cylinders, a nozzle, a spark plug and a freely moving piston connected to the compressor piston, as well as inlet and outlet pipes and suction valves, consists of 2-12 cylinder blocks mounted on a common frame, containing one cylinder of a two-stroke piston internal combustion engine 2 and piston compressor 3, the axial lines of these blocks The cylinders are parallel to each other and perpendicular to the plane of the common frame, and the pistons of all cylinder blocks are interconnected by a synchronization mechanism 4 containing crossheads located in the guides of the common frame 25 coaxially with the engine and compressor cylinders, with piston rods 23 and 24 rigidly attached to them , and on the lateral surfaces from the side of adjacent cylinder blocks of the gear racks 26, engaging with the gear crowns of the rocker arm 27 located between the crossheads and rotating on the axis 28. 2. A multi-cylinder free-piston motor compressor according to claim 1, characterized in that the two-stroke piston internal combustion engines can be gasoline, gas, gas with injection of liquid fuels or diesel. 3. A multi-cylinder free-piston motor compressor according to claim 2, characterized in that the cooling of the cylinders of a two-stroke reciprocating internal combustion engine and a reciprocating compressor can be liquid, air or combined.

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