CN110374741B - Micro free piston power device with secondary scavenging structure - Google Patents
Micro free piston power device with secondary scavenging structure Download PDFInfo
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- CN110374741B CN110374741B CN201910521820.8A CN201910521820A CN110374741B CN 110374741 B CN110374741 B CN 110374741B CN 201910521820 A CN201910521820 A CN 201910521820A CN 110374741 B CN110374741 B CN 110374741B
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- piston
- combustion chamber
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- working chamber
- piston working
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
- F02B63/041—Linear electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B71/00—Free-piston engines; Engines without rotary main shaft
- F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a micro free piston power device with a secondary scavenging structure, which comprises a cylinder and a magnetic piston, wherein the interior of the cylinder is divided into a piston working chamber and a combustion chamber, the combustion chamber is respectively arranged at two ends of the piston working chamber and is communicated with the piston working chamber, a stator winding is wound on the outer wall of the combustion chamber, and the stator winding is connected with a rectifier; arranging an exhaust port along the central line of the side wall of the piston working chamber; a pressure one-way valve which opens outwards is arranged on the side wall of the combustion chamber connected with the piston working chamber; the magnetic piston comprises a middle cylindrical part and cylindrical parts at two ends, wherein the middle cylindrical part is positioned in a piston working chamber, and the cylindrical parts are respectively positioned in combustion chambers. The invention can effectively suck out the waste gas generated by the combustion chamber by utilizing the annular vacuum chamber formed between the magnetic piston and the cylinder in each working process, and discharges the waste gas between the piston working chamber and the middle cylindrical part through the pressure one-way valve at the same side of the combustion chamber, thereby realizing secondary scavenging.
Description
Technical Field
The invention belongs to the technical field of micro free piston power devices, and particularly relates to a micro free piston power device with a secondary scavenging structure.
Background
The free piston engine is a new engine gradually developed in recent years, a crank connecting rod mechanism of a traditional engine is cancelled, a piston only makes reciprocating linear motion, and the motion rule of the piston is determined by the operation working condition of the engine. Because the free piston engine has a simple structure and is easy to miniaturize, the miniaturized free piston engine becomes another new international research field. While micro-fabrication technology continues to advance, micro-electro-mechanical systems have rapidly advanced, and high energy density, simple and portable power supply equipment is also gaining interest today. As a novel power device, the micro free piston device has higher thermal efficiency, small size, more convenient carrying, simple structure and capability of igniting or compressing fuel at a proper position of a cylinder, and a crank-connecting rod mechanism is cancelled.
However, micro-free piston power plants also have some drawbacks: the structure distribution is compacter, and air intake system is effectively improved not, and the fuel can't fully burn, and the waste gas in the cylinder can't completely discharge, just so leads to miniature free piston power device can't the even running, realizes reciprocating motion.
Disclosure of Invention
The invention provides a micro free piston power device with a secondary scavenging structure according to the problems in the prior art, and aims to provide a structural design capable of effectively discharging waste gas in a cylinder and ensure the stable operation of the micro free piston power device.
The technical scheme adopted by the invention is as follows:
a micro free piston power device with a secondary scavenging structure comprises a cylinder and a magnetic piston, wherein the interior of the cylinder is divided into a piston working chamber and a combustion chamber, the combustion chamber is respectively arranged at two ends of the piston working chamber and is communicated with the piston working chamber, a stator winding is wound on the outer wall of the combustion chamber, and the stator winding is connected with a rectifier; arranging an exhaust port along the central line of the side wall of the piston working chamber; a pressure one-way valve which opens outwards is arranged on the side wall of the combustion chamber connected with the piston working chamber;
the magnetic piston comprises a middle cylindrical part and cylindrical parts at two ends, wherein the middle cylindrical part is positioned in a piston working chamber, and the cylindrical parts are respectively positioned in combustion chambers.
Furthermore, when a combustion chamber on one side is in a combustion process, the magnetic piston is pushed to move, an annular vacuum chamber is formed between the piston working chamber on the same side with the combustion chamber and the middle cylindrical part, and waste gas generated by the combustion chamber can be effectively sucked out;
further, when a combustion chamber on one side is in a compression process, a pressure one-way valve on the same side of the combustion chamber is opened, waste gas between the piston working chamber and the middle cylindrical part is discharged, and secondary scavenging is realized;
furthermore, a one-way air inlet valve which is opened towards the inside of the combustion chamber is arranged on an inlet which is connected with the combustion chamber;
the invention has the beneficial effects that:
(1) the micro free piston power device with the secondary scavenging structure has the advantages of compact structure, symmetrical arrangement, stable operation, effective reduction of power loss in operation and more sufficient combustion.
(2) Compared with the existing micro free piston power device, the whole device has the advantages that the structural distribution is improved in the cylinder, the air inlet device adopts the air inlet valve controlled by pressure, the air exhaust device is also determined according to the motion stroke of the piston, two annular pressure vacuum chambers which are symmetrically arranged appear in the piston operation process, the secondary scavenging is carried out on waste gas, and the secondary scavenging is more sufficient in the reciprocating motion of the piston.
(3) The symmetrical pressure one-way valves are arranged on the cylinder, the residual waste gas in the annular pressure vacuum chamber is subjected to secondary scavenging by utilizing the principle of internal and external pressure difference, and when the waste gas is completely discharged, the pressure one-way valves are closed. The structure is distributed reasonably, and the problem that the micro free piston power device can not exhaust completely in the past is solved by a secondary scavenging mode.
Drawings
FIG. 1 is a schematic structural diagram of a micro free piston power unit with a secondary scavenging structure according to the invention;
FIG. 2 is a schematic view of a micro-piston according to the present invention;
FIG. 3 is a schematic diagram of the starting process of the micro piston power device of the present invention
FIGS. 4, 5, 6 and 7 are schematic diagrams of a first work process of the piston from left to right for the first time;
FIGS. 8, 9, 10, 11 and 12 are schematic diagrams of a second work process from right to left;
in the figure, 1, a left one-way air inlet valve, 2, a cylinder, 3, a stator winding, 4, a rectifier, 5, an upper exhaust port, 6, a right one-way air inlet valve, 7, a lower exhaust port, 8, a first pressure one-way valve, 9, a second pressure one-way valve 10, a third pressure one-way valve, 11, a fourth pressure one-way valve, 12, a magnetic piston, 13, a first annular vacuum chamber, 14, a second annular vacuum chamber, 15, a left combustion chamber, 16 and a right combustion chamber.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1, the micro free piston power device with the secondary scavenging structure comprises a cylinder 2, wherein the cylinder 2 is in a cross-shaped cylinder structure with central symmetry, the inside of the cylinder 2 comprises a piston working chamber and a combustion chamber, the combustion chamber is respectively positioned at the left end and the right end of the piston working chamber and is respectively a left combustion chamber 15 and a right combustion chamber 16, the centers of the left combustion chamber 15, the right combustion chamber 16 and the piston working chamber are on the same horizontal line and are communicated with each other, a left one-way air inlet valve 1 and a right one-way air inlet valve 6 which are opened towards the inside of the combustion chamber are respectively arranged at the inlet ends of the left combustion chamber 15 and the right combustion chamber 16, a stator winding 3 is wound on the outer wall of the left combustion chamber 15 and the outer wall of the right combustion chamber 16, and the stator winding 3 is connected with a rectifier 4.
The left side wall of the piston working chamber is symmetrically provided with a first pressure one-way valve 8 and a second pressure one-way valve 9, the right side wall of the piston working chamber is symmetrically provided with a third pressure one-way valve 10 and a fourth pressure one-way valve 11, and the first pressure one-way valve 8, the second pressure one-way valve 9, the third pressure one-way valve 10 and the fourth pressure one-way valve 11 are all one-way valves which are opened towards the outside. An upper exhaust port 5 and a lower exhaust port 7 are provided at the upper end and the lower end of the piston working chamber, respectively, along the center line in the vertical direction of the piston working chamber.
A magnetic piston 12 matched with the cylinder 2 is arranged in the cylinder 2, as shown in fig. 2, the magnetic piston 12 comprises a middle cylindrical part and cylindrical parts at two ends, the middle cylindrical part is positioned in a piston working chamber, and the cylindrical parts are respectively positioned in 2 combustion chambers; the magnetic piston 12 during its movement divides the inner cavity of the cylinder 2 into a left combustion chamber 15, a first annular vacuum chamber 13, and a right combustion chamber 16 and a second annular vacuum chamber 14.
In order to explain the technical scheme protected by the invention more clearly, the working process of the invention is further explained in the following;
the starting process comprises the following steps: when the magnetic piston 12 just blocks the upper exhaust port 5 and the lower exhaust port 7, the first stage of the power device starts, firstly, a storage battery switch is closed, current generated in the storage battery is converted into alternating current through the rectifier 4, an alternating magnetic field is correspondingly generated through the stator winding 3, the alternating magnetic field acts on the magnetic piston 12 to enable the magnetic piston to move, and the starting operation of the generator starts.
The working process is as follows: the initial position of the magnetic piston 12 is shown in fig. 3, at this time, the left one-way intake valve 1 and the right one-way intake valve 6 are both in an open state, fresh gas enters the cylinder 2 from the left one-way intake valve 1, and the magnetic piston 12 moves to the left side of the cylinder 2 under the action of the electromagnetic magnetic field; as shown in fig. 4, the left one-way intake valve 1 is closed due to the excessive pressure in the left combustion chamber 15, the magnetic piston 12 moves to the left side, and continuously squeezes the fresh gas in the left combustion chamber 15, while the right one-way intake valve 6 is in an open state, and the gas enters the right combustion chamber 16; as shown in fig. 5, in the process of moving the magnetic piston 12 to the left, the magnetic piston 12 continuously compresses the fresh gas in the left combustion chamber 15, and rapidly generates high-temperature exhaust gas to push the magnetic piston 12 to move to the right side of the cylinder 2; as shown in fig. 6, as the piston moves to the right side of the cylinder 2 continuously, the high-temperature exhaust gas generated at the left side, due to the negative pressure, generates a symmetrical first annular vacuum chamber 13 in the cylinder 2 before the exhaust port is opened, a large amount of exhaust gas rapidly enters the first annular vacuum chamber 13 from the left combustion chamber 15, and the right combustion chamber 16 moves to the right continuously along with the piston, so that the right one-way intake valve 6 is closed; as shown in fig. 7, when the magnetic piston 12 moves to the right and the upper exhaust port 5 and the lower exhaust port 7 are opened, the fresh gas in the right combustion chamber 16 is compressed by the piston 12, and high-temperature exhaust gas is generated to push the piston to move to the left;
as shown in fig. 8, the high-temperature exhaust gas in the right combustion chamber 16 pushes the magnetic piston 12 to move to the left side of the cylinder 2, and because the upper exhaust port 5 and the lower exhaust port 7 are in the open state, the pressure in the left combustion chamber 15 continuously drops, the left one-way intake valve 1 is opened, and the fresh gas enters the cylinder; as shown in fig. 9, when the magnetic piston 12 continuously moves to the left side of the cylinder 2, the exhaust gas remained in the first annular vacuum chamber 13 is discharged by the first pressure check valve 8 and the second pressure check valve 9, and the secondary scavenging at the left side is completed; as shown in fig. 10, the piston 12 compresses the gas in the left combustion chamber 15 at the same time, the gas is combusted to generate high-temperature exhaust gas, the exhaust gas in the right combustion chamber 16 is exhausted through the upper exhaust port 5 and the lower exhaust port 7, the pressure in the right combustion chamber 16 is rapidly reduced, and the right check intake valve 6 is opened. High-temperature waste gas generated in the left combustion chamber 15 pushes the magnetic piston 12 to move rightwards; as shown in fig. 11, the exhaust gas remaining in the second annular pressure vacuum chamber 14 is subjected to pressure rise in the vacuum chamber, the third pressure check valve 10 and the fourth pressure check valve 11 are opened, and the remaining exhaust gas is discharged therefrom, thereby completing the secondary scavenging on the right side. As shown in fig. 12, until the magnetic piston 12 moves to the rightmost end of the second annular vacuum chamber 14, the upper exhaust port 5 and the lower exhaust port 7 are simultaneously opened, the exhaust gas of the left combustion chamber 15 is sucked into the first annular vacuum chamber 13, the first stage of the reciprocating motion of the piston 12 is finished, and the process is repeated.
The micro free piston power device with the secondary scavenging structure alternately completes the air intake and exhaust process and the mixed gas combustion expansion process, pushes the magnetic piston 12 to reciprocate, and when the magnetic piston 12 reciprocates, the relative motion is equivalent to the motion of cutting a magnetic induction line by a coil wire, so that a certain current is generated; the micro engine converts energy released by compressed combustion of the mixed gas into mechanical energy of the piston, and then converts the mechanical energy of the piston into electric energy through a power generation device in the generator; waste gas generated in the combustion process is discharged through the symmetrical pressure one-way valves, so that the problem of air exchange of the air cylinder is effectively solved, and the power device is ensured to run stably and reciprocate circularly; under the conditions that the load switch is closed and the storage battery switch is opened, the generator provides electric energy for the load; the magnetic piston forms an annular vacuum chamber in the movement process, the secondary scavenging effect is obvious, and the problem of how to discharge waste gas more effectively is solved; the power devices are symmetrically arranged, and the operation is efficient and stable.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (3)
1. The micro free piston power device with the secondary scavenging structure is characterized by comprising a cylinder (2) and a magnetic piston (12), wherein the inside of the cylinder (2) is divided into a piston working chamber and a combustion chamber, the combustion chamber is respectively arranged at two ends of the piston working chamber and communicated with the piston working chamber, and an exhaust port is arranged along the central line of the side wall of the piston working chamber; a pressure one-way valve which opens outwards is arranged on the side wall of the combustion chamber connected with the piston working chamber;
the magnetic piston (12) comprises a middle cylindrical part and cylindrical parts at two ends, the middle cylindrical part is positioned in the piston working chamber, and the cylindrical parts are respectively positioned in 2 combustion chambers; when a combustion chamber on one side is in a combustion process, the magnetic piston (12) is pushed to move, and an annular vacuum chamber is formed between the piston working chamber on the same side with the combustion chamber and the middle cylindrical part, so that waste gas generated by the combustion chamber can be effectively sucked out; when a combustion chamber on one side is in a compression process, the pressure one-way valve on the same side of the combustion chamber is opened, and waste gas between the piston working chamber and the middle cylindrical part is discharged, so that secondary scavenging is realized.
2. The micro free piston power plant with secondary scavenging structure according to claim 1 characterized in that stator winding (3) is wound on the outer wall of the combustion chamber, the stator winding (3) is connected with rectifier (4).
3. The micro free piston power plant with secondary scavenging structure as claimed in claim 1 wherein a one way intake valve opening into the combustion chamber is provided at the inlet port connecting to the combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910521820.8A CN110374741B (en) | 2019-06-17 | 2019-06-17 | Micro free piston power device with secondary scavenging structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910521820.8A CN110374741B (en) | 2019-06-17 | 2019-06-17 | Micro free piston power device with secondary scavenging structure |
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| Publication Number | Publication Date |
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| CN110374741A CN110374741A (en) | 2019-10-25 |
| CN110374741B true CN110374741B (en) | 2021-04-20 |
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| CN201910521820.8A Active CN110374741B (en) | 2019-06-17 | 2019-06-17 | Micro free piston power device with secondary scavenging structure |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB869046A (en) * | 1958-06-11 | 1961-05-25 | Daimler Benz Ag | Improvements relating to free-stroke-piston internal combustion engines |
| US6349682B1 (en) * | 2000-02-09 | 2002-02-26 | Richard C. Alexius | Free piston engine and self-actuated fuel injector therefor |
| CN200989243Y (en) * | 2006-11-03 | 2007-12-12 | 江苏大学 | Single-free piston double-cylinder type internal combustion engine power generating system |
| CN103711581B (en) * | 2014-01-07 | 2016-05-25 | 江苏大学 | A kind of micro-free-piston generator with preheating apparatus and catalytic unit |
| GB201518833D0 (en) * | 2015-10-23 | 2015-12-09 | Univ Newcastle | Free piston engine power plant |
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