CN103573406A - Double-cylinder opposed free-piston internal combustion engine generator - Google Patents

Abstract

The invention relates to a dual-cylinder opposed free-piston internal combustion generator, which belongs to the field of energy and power. A dual-cylinder opposed free-piston internal-combustion generator of the present invention comprises a free-piston internal-combustion engine, a reversing gear and a linear generator. The two piston assemblies are symmetrically arranged on both sides of the generator mover, parallel to the generator mover and have the same wheelbase; there are reversing gears respectively arranged between the two rack connecting rods and the generator mover, and the rack on the rack connecting rod and the The reversing gear is meshed; the reversing gear is also meshed with the rack on the generator rotor; the rack connecting rod is movably connected with the generator rotor through the reversing gear; the invention adopts two sets of free piston internal combustion engines and linear generators The parallel structure realizes the synchronous reverse movement of the piston assembly and the generator mover through the reversing gear, so that the inertial force of all piston assemblies and the inertial force of the generator mover are balanced, and the vibration problem of the system is solved.

Description

A dual-cylinder opposed free-piston internal combustion generator

technical field

The invention relates to an energy and power engineering mechanical device, in particular to a dual-cylinder opposed free-piston internal combustion generator, which belongs to the field of energy and power.

Background technique

In recent years, people have been working hard to find a piston internal combustion generator with high energy conversion efficiency and low vibration and noise. Among them, the free piston internal combustion linear power generation device is a combination of free piston internal combustion engine and linear generator. A new type of energy conversion device, which directly connects the free piston with the linear motor mover to form the only moving part - the piston assembly. When the system is running, the gas in the cylinder burns and expands to do work, pushes the piston and drives the mover to move, and then generates electrical energy, and finally converts the chemical energy of the fuel directly into electrical energy through a short transmission path. It has many potential performance advantages, such as less mechanical friction loss, compact structure and small size, short energy transmission path, and good combustion and emission quality.

However, since the piston assembly is the only moving part in the free piston generator, the inertial force of the piston assembly cannot be balanced by other reciprocating masses during reciprocating motion, which brings vibration problems to the entire power system. In order to make the system balanced, some researchers adopt the structural form of multi-module parallel combination, which can be found in CarterD, WechenerE. cylinder and a set of piston assemblies. By controlling the movement of the piston components in each module, their inertial forces and moments cancel each other out, but this method requires at least 4 sets of modules to balance the reciprocating inertial forces and moments at the same time, the structure is complex and synchronous control is difficult, and it is difficult to realize the practical application of the product.

Contents of the invention

The purpose of the present invention is to avoid the vibration problem of the whole system caused by the unbalanced inertial force of the piston assembly of the existing free-piston internal-combustion generator, thereby proposing a double-cylinder opposed free-piston internal-combustion generator.

The purpose of the present invention is achieved through the following technical solutions.

A dual-cylinder opposed free-piston internal-combustion generator of the present invention mainly comprises a free-piston internal-combustion engine, a reversing gear and a linear generator.

Free piston internal combustion engine includes: intake and exhaust controller, fuel injector, exhaust valve, intake valve, cylinder, piston, rack and connecting rod; cylinder is equipped with fuel injector, exhaust valve and intake valve; exhaust valve It is connected with the intake valve and the intake and exhaust controller; there is a piston in the cylinder; the two pistons are fixedly connected by a rack and connecting rod to form a piston assembly;

A linear generator includes a generator stator coil and a generator mover. A gear rack is arranged on the generator rotor.

Connection relationship: The two piston assemblies are symmetrically arranged on both sides of the generator mover, parallel to the generator mover and have the same wheelbase; there are reversing gears arranged between the two rack connecting rods and the generator mover, and the gears on the rack connecting rod The rack meshes with the reversing gear; the reversing gear also meshes with the rack on the generator rotor; the rack connecting rod is movably connected with the generator rotor through the reversing gear;

work process:

During operation, the cylinders of the two free-piston internal combustion engines on the left explode simultaneously, pushing the two-piston assembly to move to the right. The rack and connecting rod in the piston assembly drives the reversing gear to rotate, so that the generator mover meshing with the reversing gear moves to the left, cutting the magnetic induction line, and generating electric energy output. Until the two piston assemblies reach the top dead center of the right cylinder, explosive pressure is generated in the two cylinders on the right simultaneously, and the next cycle is entered.

Because the reversing gear meshes the piston assembly and the generator rotor together simultaneously, the movement of the two piston assemblies and the motion of the generator rotor are synchronously reversed. By matching the mass of the moving parts so that the total mass of the piston assembly is equal to the mass of the generator rotor, the inertial forces of the moving parts in the system in the axial direction can cancel each other out, and the system is naturally balanced.

Beneficial effect

1. A dual-cylinder opposed free-piston internal-combustion generator of the present invention adopts a structure in which two sets of free-piston internal-combustion engines are connected in parallel with a linear generator, and the synchronous reverse movement of the piston assembly and the generator mover is realized through the reversing gear, so that The inertial force of all piston assemblies is balanced with the inertial force of the generator mover, which solves the vibration problem of the system. The structure is simpler than the four-module free-piston generator.

2. The reversing mechanism as a key component has a simple structure and is mainly composed of a rack and pinion. It is a mature technology with high reliability, convenient manufacturing and processing, low cost, and is easy to realize standardization and productization.

Description of drawings

Fig. 1 is a sectional view of a cross-balanced free-piston internal combustion linear generator of the present invention.

Among them, 1—intake and exhaust controller, 2—injector, 3—exhaust valve, 4—intake valve, 5—cylinder, 6—piston, 7—rack connecting rod, 8—reversing gear, 9 — Generator stator coil; 10 — Generator mover.

Detailed ways

Example 1

A dual-cylinder opposed free-piston internal combustion generator mainly includes a free-piston internal combustion engine, a reversing gear 8, and a linear generator.

The free piston internal combustion engine includes: intake and exhaust controller 1, fuel injector 2, exhaust valve 3, intake valve 4, cylinder 5, piston 6, rack and connecting rod 7; cylinder 5 is provided with fuel injector 2, exhaust The valve 3 and the intake valve 4; the exhaust valve 3 and the intake valve 4 are connected with the intake and exhaust controller 1; the cylinder 5 is provided with a piston 6; the two pistons 6 are fixedly connected by a rack connecting rod 7 to form a piston assembly.

The linear generator includes a generator stator coil 9 and a generator mover 10 . A rack is arranged on the generator rotor 10 .

Connection relationship: the two piston assemblies are symmetrically arranged on both sides of the generator mover 10, parallel to the generator mover 10 and have the same wheelbase; a reversing gear 8 is arranged between the two rack connecting rods 7 and the generator mover 10, The two reversing gears 8 are located on the same side; the rack on the rack connecting rod 7 meshes with the reversing gear 8; the reversing gear 8 also meshes with the rack on the generator rotor 10; The rack connecting rod 7 is movably connected with the generator mover 10 .

work process:

During operation, the cylinders of the two free-piston internal combustion engines on the left explode simultaneously, pushing the two-piston assembly to move to the right. The rack connecting rod 7 in the piston assembly drives the reversing gear 8 to rotate, so that the generator mover 10 meshing with the reversing gear 8 moves to the left, cutting the magnetic induction line, and generating electric energy output. Until the two piston assemblies reach the top dead center of the right cylinder, explosive pressure is generated in the two cylinders on the right simultaneously, and the next cycle is entered.

Since the reversing gear 8 meshes the piston assembly and the generator rotor 10 simultaneously, the movement of the two piston assemblies and the motion of the generator rotor 10 are synchronously reversed. By matching the mass of the moving parts so that the total mass of the piston assembly is equal to the mass of the generator rotor 10, the inertial forces of the moving parts in the system in the axial direction can cancel each other out, and the system is naturally balanced.

Example 2

A dual-cylinder opposed free-piston internal combustion generator mainly includes a free-piston internal combustion engine, a reversing gear 8, and a linear generator.

The free piston internal combustion engine includes: intake and exhaust controller 1, fuel injector 2, exhaust valve 3, intake valve 4, cylinder 5, piston 6, rack and connecting rod 7; cylinder 5 is provided with fuel injector 2, exhaust The valve 3 and the intake valve 4; the exhaust valve 3 and the intake valve 4 are connected with the intake and exhaust controller 1; the cylinder 5 is provided with a piston 6; the two pistons 6 are fixedly connected by a rack connecting rod 7 to form a piston assembly.

The linear generator includes a generator stator coil 9 and a generator mover 10 . A rack is arranged on the generator rotor 10 .

Connection relationship: the two piston assemblies are symmetrically arranged on both sides of the generator mover 10, parallel to the engine mover 10 and have the same wheelbase; a reversing gear 8 is arranged between the two rack connecting rods 7 and the generator mover 10, The two reversing gears 8 are located on different sides; the rack on the rack connecting rod 7 meshes with the reversing gear 8; the reversing gear 8 also meshes with the rack on the generator rotor 10; The rack connecting rod 7 is movably connected with the generator mover 10 .

work process:

During operation, the cylinders of the two free-piston internal combustion engines on the left explode simultaneously, pushing the two-piston assembly to move to the right. The rack connecting rod 7 in the piston assembly drives the reversing gear 8 to rotate, so that the generator mover 10 meshing with the reversing gear 8 moves to the left, cutting the magnetic induction line, and generating electric energy output. Until the two piston assemblies reach the top dead center of the right cylinder, explosive pressure is generated in the two cylinders on the right simultaneously, and the next cycle is entered.

Since the reversing gear 8 meshes the piston assembly and the generator rotor 10 simultaneously, the movement of the two piston assemblies and the motion of the generator rotor 10 are synchronously reversed. By matching the mass of the moving parts so that the total mass of the piston assembly is equal to the mass of the generator rotor 10, the inertial forces of the moving parts in the system in the axial direction can cancel each other out, and the system is naturally balanced.

Claims (3)

1. A dual-cylinder opposed free-piston internal combustion generator, characterized in that: it comprises a free-piston internal combustion engine, a reversing gear (8), and a linear generator; the two piston assemblies are symmetrically arranged on both sides of the generator mover (10), At the same time, it is parallel to the generator mover (10) and the wheelbase is equal; there are reversing gears (8) respectively arranged between the two rack connecting rods (7) and the generator mover (10), and the gears on the rack connecting rod (7) The rack meshes with the reversing gear (8); the reversing gear (8) also meshes with the rack on the generator rotor (10); connects the rack connecting rod (7) and The generator mover (10) is flexibly connected. 2. A dual-cylinder opposed free-piston internal combustion generator according to claim 1, characterized in that: the free-piston internal combustion engine includes: intake and exhaust controller (1), fuel injector (2), exhaust Door (3), intake valve (4), cylinder (5), piston (6), rack connecting rod (7); cylinder (5) is equipped with injector (2), exhaust valve (3) and The intake valve (4); the exhaust valve (3) is connected with the intake valve (4) and the intake and exhaust controller (1); the cylinder (5) is equipped with a piston (6); the two pistons (6) pass through the gear Bar connecting rods (7) are fixedly connected to form a piston assembly. 3. A dual-cylinder opposed free-piston internal combustion generator as claimed in claim 1, characterized in that: the linear generator includes a generator stator coil (9) and a generator mover (10); the generator mover (10) A rack is arranged on the top.

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