RU2548527C1 - Method to prevent concussion of piston groups against cylinder ends in double-cylinder free-piston power unit with external combustion chamber with help of gas distribution valves - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: method involves a control system, cylinders with gas distribution valves and piston groups composed of two pistons coupled by a stem, and an external combustion chamber; according to the invention, at travelling of piston groups from one extreme point to another extreme point, the control system in each cylinder switches the gas distribution valves into opposite positions basing on the monitored instantaneous velocity of the piston group. When a piston group arrives at the extreme point, its speed is zero; and at approaching of the piston group to the extreme point the control system switches the gas distribution valves into opposite positions, supply of combustion products from the external combustion chamber to the cavity of one piston and discharge of waste combustion products from the cavity of another piston are stopped, pressure of combustion products remaining in the cavity of another piston is increased and compression of the combustion products remaining in the cavity of another piston results in slowdown and stop of the piston group in the extreme point, so impact of the piston group against the cylinder end is prevented; afterwards the control system of gas distribution valves provides for gas exchange in the power unit cylinders making the piston group move to the opposite extreme point.

EFFECT: prevention of piston group concussion against cylinder ends.

1 dwg

Description

FIELD OF TECHNOLOGY

The invention relates to the field of power engineering.

BACKGROUND

The closest prototype of the claimed invention "Method for synchronizing the movement of the pistons of a twin twin-cylinder free-piston power module", Patent 2441993. The power module operates as follows. The combustion products from the combustion chamber 1 (see the drawing) through the pipe 2 through the gas distribution valve 3 enter the right (according to the drawing) end cavity of the piston 4 of the left expansion machine 5, and through the pipe 6 and through the gas distribution valve 7 to the left end cavity of the piston 8 the right expansion machine 9. Under the influence of expanding combustion products, the pistons 4, 8 and the anchors of the linear generator 10, 11 connected to them begin to diverge. The anchors can be either permanent magnets or electromagnets magnetized by a magnetizing coil 12. The magnetic flux of the generator closes along the contour: anchor 11, stator magnet 13, anchor 10 and again anchor 11. When the anchors 10, 11 diverge, their magnetic fluxes intersect, resulting in the stator magnet 13 changes the magnetic flux and, as a result, an impulse of electricity is generated in the stator coil 14. When the pistons and anchors reach the points of extreme divergence, the control system translates the gas distribution valves 3, 7, 15, 16 to opposite positions. Now, the combustion products from the combustion chamber 1 through the pipeline 2 and through the gas distribution valve 15 enter the left end cavity of the piston 17, and through the pipe 6 and through the gas distribution valve 16 to the right end cavity of the piston 18. The pistons and the generator armature connected to them begin to converge, and in the stator coil 14, a pulse of the opposite sign is generated. When the pistons diverge, the exhaust combustion products are released into the atmosphere through the exhaust valves 15 and 16, and when converging through the exhaust valves 3 and 7. Simultaneously through the check valves 19, 20, 21, 22 from the corresponding piston cavities through the pipelines 23, 24 into the combustion chamber 1, air is supplied, and air from the atmosphere is sucked in through check valves 25, 26, 27, 28.

OBJECT OF THE INVENTION

As follows from the description of the principle of action of the energy module, the probability of hard blows of piston groups against the ends of the cylinders of the energy module is high. To prevent blows of piston groups on the ends of cylinders in any free piston machine, a mechanism is needed to prevent such blows. The action of known similar mechanisms is based on mechanical bonds. The purpose of the claimed invention is to achieve the same effect in free piston machines, without the use of any mechanical connections.

SUMMARY OF THE INVENTION

A method for preventing gas distribution valves from striking piston groups against cylinder ends of a two-cylinder free-piston with an external combustion chamber of an energy module is as follows.

When piston groups consisting of pistons 4, 17 in the left cylinder and pistons 8, 18 in the right cylinder move from one extreme point of movement to another extreme point, the control system determines the timing of the transfer of gas distribution valves 3, 15, 7 based on the monitored instantaneous speeds of the piston groups , 16 to opposite positions so that when the piston groups arrive at the extreme points of motion, their velocities are equal to zero. Then, when the piston groups approach the extreme points of movement, the control system in accordance with a certain point in time translates the gas distribution valves 3, 15 and 7, 16 into opposite positions. As a result, the entry of combustion products from the external combustion chamber 1 into the piston cavity 4 and the emission of exhaust combustion products from the piston cavity 17 in the left cylinder and into the piston cavity 8 and the emission of combustion products ceases, the pressure of the remaining products remaining in the piston cavity 17 and in the piston cavity 18 combustion increases, and the speed decreases until they stop, which eliminates the impact of piston groups on the ends of the cylinders. Then, the gas distribution valve control system organizes gas exchange in the cylinders of the energy module, providing movement of the piston groups to opposite extreme points of movement.

SUMMARY OF THE INVENTION

A method for preventing gas distribution valves from blowing piston groups against cylinder ends of a two-cylinder free piston with an external combustion chamber of an energy module including a control system, cylinders with gas distribution valves and piston groups consisting of each two pistons connected by a rod and an external combustion chamber, characterized in that when the piston groups move out one extreme point of movement to another extreme point of movement the control system in each cylinder based on the monitored instant At the same time, the piston group moves the gas distribution valves to opposite positions, while when the piston group arrives at the extreme point of movement, the piston group speed is zero, and when the piston group approaches the extreme point of movement, the control system moves the gas distribution valves to opposite positions, and the combustion products arrive from external combustion chamber into the cavity of one piston and the exhaust of exhaust products from the cavity of another piston stops, the pressure remaining in the cavity of the other piston of the combustion products increases, which results in the compression of the remaining combustion products in the other cavity of the piston to slow down and stop the piston group at the end point of movement, as a result of which the piston group does not hit the cylinder end, after which the gas distribution valve control system organizes in the cylinders energy module gas exchange, providing movement of the piston group to the opposite extreme point of movement.

TECHNICAL APPLICABILITY OF THE INVENTION

The costs of R&D and production of the claimed invention cannot differ significantly from those in the design and development of classical compressors.

GRAPHIC MATERIAL

The drawing shows a schematic diagram of a reciprocating twin twin-cylinder free-piston power module: 1 - combustion chamber; 2, 6, 23, 24 - pipeline; 3, 7, 15, 16 - gas distribution valve; 4, 8, 17, 18 - the piston of the expansion machine; 5, 9 - expansion machine; 10, 11 - anchor; 12 - magnetization coil of the armature; 13 - stator magnet; 14 - stator coil; 19, 20, 21, 22, 25, 26, 27, 28 - check valve.

Claims (1)

A method for preventing gas distribution valves from blowing piston groups against cylinder ends of a two-cylinder free piston with an external combustion chamber of an energy module including a control system, cylinders with gas distribution valves and piston groups consisting of each two pistons connected by a rod and an external combustion chamber, characterized in that when the piston groups move out one extreme point of movement to another extreme point of movement the control system in each cylinder based on the monitored instant At the same time, the piston group moves the gas distribution valves to opposite positions, while when the piston group arrives at the extreme point of movement, the piston group speed is zero, and when the piston group approaches the extreme point of movement, the control system moves the gas distribution valves to opposite positions, and the combustion products arrive from external combustion chamber into the cavity of one piston and the exhaust of exhaust products from the cavity of another piston stops, the pressure remaining in the cavity of the other piston of the combustion products increases, which results in the compression of the remaining combustion products in the other cavity of the piston to slow down and stop the piston group at the end point of movement, as a result of which the piston group does not hit the cylinder end, after which the gas distribution valve control system organizes in the cylinders energy module gas exchange, providing movement of the piston group to the opposite extreme point of movement.