CN109653898B - Electric feedback opposed free piston Stirling generator - Google Patents
Electric feedback opposed free piston Stirling generator Download PDFInfo
- Publication number
- CN109653898B CN109653898B CN201910058225.5A CN201910058225A CN109653898B CN 109653898 B CN109653898 B CN 109653898B CN 201910058225 A CN201910058225 A CN 201910058225A CN 109653898 B CN109653898 B CN 109653898B
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- China
- Prior art keywords
- free piston
- linear motor
- piston stirling
- stirling generator
- generator
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- 239000003990 capacitor Substances 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1869—Linear generators; sectional generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G2280/00—Output delivery
- F02G2280/10—Linear generators
Abstract
An embodiment of the present invention provides an electrical feedback opposed free piston Stirling generator comprising: the device comprises an opposite free piston Stirling generator, a capacitor and a load, wherein two ends of the capacitor are respectively connected with two linear motors in the opposite free piston Stirling generator, and two ends of the load are respectively connected with two linear motors in the opposite free piston Stirling generator. The invention uses the mutual electric feedback between the linear motors to ensure that the pistons in the two linear motors meet the energy condition of reciprocating vibration, thereby enabling the piston-opposed free piston Stirling generator to start and stably operate.
Description
Technical Field
The embodiment of the invention relates to the technical field of generators, in particular to an electric feedback opposed free piston Stirling generator.
Background
The free piston Stirling generator is a highly efficient external combustion type thermoelectric conversion machine that can utilize almost all heat source types available. The complex crankshaft connecting rod mechanism of the traditional Stirling generator is eliminated, the power piston and the gas distribution piston are not limited by mechanical structures, and the motion is independent and adopts a dynamic sealing technology. Therefore, the thermoelectric power generation device has the advantages of simple structure, high thermoelectric efficiency, low noise and vibration, self-starting, high reliability, long service life and the like.
The free piston Stirling engine has very wide application prospect and mainly comprises a space deep space detector isotope power supply, a space large-scale nuclear power station, a ground solar power station, household cogeneration, national defense application and the like.
According to the classification of the traditional crank-link Stirling generators, the free-piston Stirling generators are also divided into three types of opposed, coaxial and parallel types according to the form of movement of two pistons, wherein the opposed refers to the opposed of two pistons of the generator.
However, the opposed free piston stirling generators therein have proven incapable of starting.
Disclosure of Invention
The embodiment of the invention provides an electric feedback opposite free piston Stirling generator, which is used for solving the problem that the opposite free piston Stirling generator cannot be started normally in the prior art.
The embodiment of the invention provides an electric feedback opposite type free piston Stirling generator, which comprises: the device comprises an opposite free piston Stirling generator, a capacitor and a load, wherein two ends of the capacitor are respectively connected with two linear motors in the opposite free piston Stirling generator, and two ends of the load are respectively connected with two linear motors in the opposite free piston Stirling generator.
The electric feedback opposite free piston Stirling generator provided by the embodiment of the invention is provided with the two linear motors, and the pistons in the two linear motors meet the energy condition of reciprocating vibration by utilizing the mutual electric feedback between the linear motors, so that the piston opposite free piston Stirling generator can be started and stably operated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electric feedback opposed free piston stirling generator in accordance with an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Existing opposed free piston stirling generators are not capable of starting, converting thermal energy to electrical energy, and typically comprise only one linear motor.
In order to solve the starting problem of the traditional opposed generator, the invention provides a double-motor electric feedback opposed free piston Stirling generator.
The generator provided by the invention is provided with two linear motors, and the two pistons can meet the energy condition of reciprocating vibration by utilizing mutual electric feedback between the linear motors, so that the piston-opposite free piston Stirling generator can be started and stably operated.
Fig. 1 is a schematic structural diagram of an electric feedback opposed free piston stirling generator according to an embodiment of the present invention, as shown in fig. 1, the generator includes: the device comprises an opposite free piston Stirling generator, a capacitor and a load, wherein two ends of the capacitor are respectively connected with two linear motors in the opposite free piston Stirling generator, and two ends of the load are respectively connected with two linear motors in the opposite free piston Stirling generator.
Specifically, in this embodiment, two coils of the opposed free piston stirling generator are connected by wires, and a capacitor is added to the two wires, wherein the capacitor is used to adjust the phase of the two pistons in the opposed free piston stirling generator, and the load is used to consume most of the electrical energy of the generator, where the two pistons refer to the pistons in the first and second linear motors.
The principle of adjusting the two pistons through the capacitor in the embodiment of the invention is as follows:
assuming that the equation for the first motor reciprocation is:
x 1 ＝X 1 sin wt，
the equation of the reciprocating motion of the second motor under the driving condition of the first motor can be calculated according to the electric and dynamic balance equation:
where δ is the phase due to the connection capacitance in the circuit and β is the phase due to dynamics, which is generally difficult to change. The phase of the reciprocation of the two pistons can only be changed by changing the capacitance in the circuit. The electric balance equation can be obtained:
wherein, inductance X L And the resistance R is generally unchanged, thus changing the capacitance X C The magnitude of the motion of the two motors can be changed.
When the generator is operating stably, the power is mainly consumed by the load, and the amount of power consumed by the load is proportional to the size of the load. The main consumed electric energy in the circuit is an external load R and the internal resistance R of the second linear motor, and the electric energy is consumed by the load mainly because R is far greater than R, and the second linear motor consumes only a small part.
The energy distribution of the traditional opposed free piston Stirling generator is uneven, positive work is applied to one piston and negative work is applied to the other piston in one cycle, and the energy balance condition of piston vibration is not met.
Therefore, the invention connects the two linear motors through the electric feedback technology, so that one part of electricity generated by one linear motor is output to a load for use, the other part drives the other linear motor to vibrate, and the phase of vibration of the two pistons is changed through a capacitor, so that the vibration of the two pistons meets the requirement of Stirling cycle.
Specifically, the opposed free piston Stirling generator comprises a first linear motor, a second linear motor, a compression cavity, a cooler, a heat regenerator, a heater and an expansion cavity, wherein the first linear motor is connected with the second linear motor through the expansion cavity, the heater, the heat regenerator, the cooler and the compression cavity in sequence.
The first linear motor comprises an outer return iron, a coil, an inner return iron, a piston, a plate spring and a pressed cavity.
The electric feedback opposite free piston Stirling generator comprises two opposite first linear motors and second linear motors which are respectively connected with two pistons, and specifically comprises a compression cavity 1, a cooler 2, a regenerator 3, a heater 4, an expansion cavity 5, an outer return iron 6, a coil 7, an inner return iron 8, a piston 9, a leaf spring 10 and a pressed cavity 11, and further comprises a capacitor 12, a load 13 and a wire 14 which are connected with the two linear motors.
The two coils of the opposed free piston Stirling generator are connected by wires and a capacitor is added to the circuit, wherein the capacitor is used for adjusting the phases of the two pistons and a load consumes most of the electric energy of the generator.
The stirling generator must be able to successfully start up with both pistons oscillating reciprocally at the same time and the oscillations of both pistons must meet a certain phase relationship.
Wherein the piston 9 is connected with the coil 7 to perform reciprocating sinusoidal vibration, and the basic structures of the first linear motor and the second linear motor are identical.
The piston in the expansion chamber is called the expansion piston, and the piston in the compression chamber is called the compression piston.
There is only one linear motor for a conventional opposed-piston free-piston Stirling generator.
When the opposed free piston Stirling generator is started, the cooler 2 can be cooled or the heater 4 can be heated, the cooler 2 is cooled for example, the volume of gas in the cooler 2 is reduced when the gas encounters cold, the compression cavity 1 is pushed to compress, so that the second linear motor is driven to generate electricity, heat energy of the gas can be converted into electric energy of the generator, part of electric energy generated by the second linear motor is transmitted to the first linear motor through a capacitor to drive the first linear motor to move, and the other part of electric energy generated by the second linear motor is consumed by a load.
The work of the circulating gas on the expansion piston is W e More than 0, the gas applies work W to the compression piston c ＜0。
In order to enable the start of an opposed free piston Stirling generator, the present invention proposes a dual motor electric feedback opposed free piston Stirling generator.
The principle is that the gas does positive work W to the expansion piston e The first linear motor connected with the piston converts the electric power into the electric power, wherein a part of the electric power is consumed by a load, and the other part of the electric power is fed back to the second linear motor connected with the compression piston to drive the piston to vibrate in a reciprocating manner so as to overcome the negative work of the gas on the compression piston, so that the electric power W=W externally output by the generator e -W c . And meanwhile, the phase relation of the reciprocating vibration of the two pistons is regulated through a phase modulation capacitor in the feedback circuit, so that the phase modulation capacitor meets the requirement of Stirling cycle.
The invention has the greatest advantage that the problem that the opposed free piston Stirling generator cannot be started is solved by a double-motor electric feedback technology. Because of the double motors, a part of the electric energy generated by the first linear motor is transmitted to the load for consumption, and the other part of the electric energy is used for driving the second linear motor to vibrate in a reciprocating way. And the capacitor in the feedback circuit can also well regulate the performance of the generator.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. An electrical feedback opposed free piston stirling generator comprising: the device comprises an opposite free piston Stirling generator, a capacitor and a load, wherein two ends of the capacitor are respectively connected with two linear motors in the opposite free piston Stirling generator, and two ends of the load are respectively connected with two linear motors in the opposite free piston Stirling generator;
the opposed free piston Stirling generator comprises a first linear motor, a second linear motor, a compression cavity, a cooler, a heat regenerator, a heater and an expansion cavity, wherein the first linear motor is connected with the second linear motor sequentially through the expansion cavity, the heater, the heat regenerator, the cooler and the compression cavity; the first linear motor, the second linear motor, the cooler, the regenerator, the heater and the expansion chamber are arranged in a linear structure;
wherein the motion phase between the first linear motor and the second linear motor is adjusted by changing the capacitance of the capacitor.
2. The generator of claim 1, wherein the first linear motor comprises an outer return iron, a coil, an inner return iron, a piston, a leaf spring, and a compressed cavity.
3. The generator of claim 2, wherein the first linear motor is identical in construction to the second linear motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910058225.5A CN109653898B (en) | 2019-01-22 | 2019-01-22 | Electric feedback opposed free piston Stirling generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910058225.5A CN109653898B (en) | 2019-01-22 | 2019-01-22 | Electric feedback opposed free piston Stirling generator |
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| Publication Number | Publication Date |
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| CN109653898A CN109653898A (en) | 2019-04-19 |
| CN109653898B true CN109653898B (en) | 2024-03-15 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206657B (en) * | 2019-07-03 | 2023-12-19 | 中国科学院理化技术研究所 | Thermal hysteresis type free piston Stirling generator |
| CN114000943A (en) * | 2020-07-28 | 2022-02-01 | 中国科学院理化技术研究所 | Internal combustion power generation device and unmanned aerial vehicle power system |
| CN117569945B (en) * | 2024-01-15 | 2024-04-09 | 湖南大学 | Stirling generator starting process simulation method |
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| CN1555990A (en) * | 2003-12-30 | 2004-12-22 | 联合汽车电子有限公司 | Mixed power automobile control system and its control method |
| WO2011020988A2 (en) * | 2009-08-17 | 2011-02-24 | Isis Innovation Limited | Stirling cycle machine |
| CN103089480A (en) * | 2013-01-18 | 2013-05-08 | 中科力函(深圳)热声技术有限公司 | Free piston stirling heat engine |
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| CN209621492U (en) * | 2019-01-22 | 2019-11-12 | 中国科学院理化技术研究所 | Electricity feedback opposed type free piston stirling generator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8752375B2 (en) * | 2011-08-16 | 2014-06-17 | Global Cooling, Inc. | Free-piston stirling machine in an opposed piston gamma configuration having improved stability, efficiency and control |
| US8857173B2 (en) * | 2012-01-13 | 2014-10-14 | Sunpower, Inc. | Two piston, concentric cylinder, alpha free piston Stirling machine |
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2019
- 2019-01-22 CN CN201910058225.5A patent/CN109653898B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1555990A (en) * | 2003-12-30 | 2004-12-22 | 联合汽车电子有限公司 | Mixed power automobile control system and its control method |
| WO2011020988A2 (en) * | 2009-08-17 | 2011-02-24 | Isis Innovation Limited | Stirling cycle machine |
| CN103089480A (en) * | 2013-01-18 | 2013-05-08 | 中科力函(深圳)热声技术有限公司 | Free piston stirling heat engine |
| CN103114941A (en) * | 2013-02-01 | 2013-05-22 | 中国科学院理化技术研究所 | Free piston Stirling engine system utilizing high-low temperature heat sources meanwhile |
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