CN114458473A - Free piston stirling generator - Google Patents
Free piston stirling generator Download PDFInfo
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- CN114458473A CN114458473A CN202210108008.4A CN202210108008A CN114458473A CN 114458473 A CN114458473 A CN 114458473A CN 202210108008 A CN202210108008 A CN 202210108008A CN 114458473 A CN114458473 A CN 114458473A
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- 238000010248 power generation Methods 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 description 8
- RDYMFSUJUZBWLH-UHFFFAOYSA-N endosulfan Chemical compound C12COS(=O)OCC2C2(Cl)C(Cl)=C(Cl)C1(Cl)C2(Cl)Cl RDYMFSUJUZBWLH-UHFFFAOYSA-N 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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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
- F02G1/0435—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 the engine being of the free piston type
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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
- F02G1/053—Component parts or details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
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- 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
- H02K7/1876—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts
- H02K7/1884—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts structurally associated with free piston engines
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to the technical field of power generation, and provides a free piston Stirling generator, which comprises: the phase modulator is arranged on one side, close to the expansion cavity, of the positioning flange and is connected with the phase modulator, a thermoacoustic unit is arranged on the peripheral side of the phase modulator and is used for generating acoustic power, and an installation cavity is formed on one side, far away from the expansion cavity, of the positioning flange; the power piston is arranged in the mounting cavity, one side of the power piston, which is far away from the thermoacoustic unit, is connected with a power generation unit, and the power piston moves in a reciprocating manner relative to the positioning flange under the action of sound power; the positioning flange and the cylinder body form a power piston spring cavity, the power spring cavity is positioned between the thermoacoustic unit and the power generation unit and communicated with the mounting cavity, and a first motor cooler is arranged in the power piston spring cavity and used for cooling heat flowing from the thermoacoustic unit side to the power generation unit side. Thus, the power generating unit may not be affected by the higher temperature of the thermo-acoustic unit side.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a free piston Stirling generator.
Background
At present, for certain specific occasions with poor heat dissipation conditions, the heat rejection temperature of the cold end of the free piston Stirling generator is required to be increased as much as possible. However, in the existing generator, the compression cavity and the linear motor are isolated from each other through the power piston and the air cylinder, the structure is very compact, but a small part of hot air in the compression cavity penetrates through the gap sealing surface of the power piston to enter the linear motor, and meanwhile, the air cylinder can also guide heat into the linear motor. Under the structure, if the linear motor is cooled to a temperature which is obviously lower than that of the compression cavity, the piston and the cylinder are easy to have large temperature gradient to generate thermal stress deformation, so that a gap is damaged, and a motor rotor cannot work normally. To eliminate this temperature gradient, the cooling environment of the linear electric machine is generally the same as that of the engine-side cooler. Therefore, the increase of the heat extraction temperature means that the motor also needs to work in a high-temperature environment, and in addition, the heat of the motor is generated, the temperature of the permanent magnet is still higher than the external cooling temperature of the motor, and performance reduction and even demagnetization can occur. In addition, the phase modulator's magnetic return circuit also needs to operate at high temperatures, with a greater risk of failure.
Disclosure of Invention
The embodiment of the invention provides a free piston Stirling generator, which is used for solving the technical problem that the generator in the prior art cannot be applied to an environment with poor heat dissipation conditions.
The embodiment of the invention provides a free piston Stirling generator, which comprises:
the phase modulator is arranged on the side, close to the expansion cavity, of the positioning flange and is connected with the phase modulator, a thermoacoustic unit is arranged on the peripheral side of the phase modulator and is used for generating acoustic power, and an installation cavity is formed on the side, far away from the expansion cavity, of the positioning flange;
the power piston is arranged in the mounting cavity, one side of the power piston, which is far away from the thermoacoustic unit, is connected with a power generation unit, and the power piston moves back and forth relative to the positioning flange under the action of the acoustic power; wherein the content of the first and second substances,
the positioning flange and the cylinder body form a power piston spring cavity, the power spring cavity is positioned between the thermoacoustic unit and the power generation unit and communicated with the mounting cavity, a first motor cooler is arranged in the power piston spring cavity and used for cooling heat of the thermoacoustic unit side flowing to the power generation unit side.
According to the free piston Stirling generator, the phase modulator comprises a phase modulator piston, a gas spring piston is formed on one side, away from the power piston, of the positioning flange, a protruding portion is arranged inside the phase modulator piston and corresponds to the gas spring piston, the protruding portion is in clearance seal with the gas spring piston, and the inner space of the phase modulator is divided into a hot end gas spring cavity and a cold end gas spring cavity.
According to the free piston Stirling generator, the phase modulator is internally provided with a plate spring, and one end of the gas spring piston is connected with the plate spring.
According to the free piston Stirling generator, the thermoacoustic unit comprises a high-temperature heat exchanger, a heat regenerator and a low-temperature heat exchanger which are sequentially connected, wherein the high-temperature heat exchanger is arranged close to one side of the expansion cavity;
and the positioning flange is provided with a connecting hole for transmitting the sound power generated by the side of the thermoacoustic unit to the power piston.
According to the free piston Stirling generator, a compression cavity is formed between the top of the power piston and the positioning flange and is communicated with the connecting hole.
According to the free piston Stirling generator, the power piston is in clearance seal with the positioning flange, a communication chamber is formed on one side, away from the compression chamber, of the power piston, and the communication chamber is communicated with the power piston spring cavity.
According to the free piston Stirling generator, the cylinder body is internally provided with a connecting piece, a matching cavity is formed in the middle of the connecting piece, and the connecting piece is arranged on one side, away from the expansion cavity, of the positioning flange;
the power piston is arranged between the connecting piece and the positioning flange, and the connecting piece and the positioning flange form the communicating cavity.
According to the free piston Stirling generator, the power generation unit comprises a connecting rod, the connecting rod penetrates through the matching chamber and is connected with the power piston, a permanent magnet is arranged on the connecting rod, an inner stator is arranged on the periphery of the connecting rod in a surrounding mode, an outer stator opposite to the inner stator is further arranged in the cylinder body, and a copper coil is arranged in the outer stator in a surrounding mode on one side, facing the permanent magnet, of the inner portion of the outer stator.
According to the free piston Stirling generator, the inner side of the cylinder body is provided with the second motor cooler, and the second motor cooler is arranged on one side, away from the positioning flange, of the connecting piece.
According to the free piston Stirling generator, the third motor cooler is sleeved on the outer side of the cylinder body, and the third motor cooler is arranged close to the outer peripheral side of the power generation unit.
According to the free piston Stirling generator provided by the embodiment of the invention, the power piston spring cavity is formed by the positioning flange and the cylinder body, and the first motor cooler is arranged in the power spring cavity, so that the high-temperature heat at the side of the thermo-acoustic unit is prevented from being transmitted to the side of the power generation unit, therefore, under the condition of poor external heat dissipation environment, one side of the power generation unit is not influenced by the higher temperature at the side of the thermo-acoustic unit, and the power generation unit is ensured to run efficiently and stably.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the free piston Stirling generator of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment shown in FIG. 1;
FIG. 3 is a schematic view of the phase adjusting mechanism of FIG. 1 in cooperation with a positioning flange;
reference numerals:
10. a cylinder body; 110. an expansion chamber; 120. positioning the flange; 1210. a mounting cavity; 1220. a gas spring piston; 1230. connecting holes; 130. a phase modulator; 1310. a phase modulator piston; 1320. a boss portion; 1330. a hot end gas spring cavity; 1340. a cold end gas spring chamber; 1350. a plate spring; 140. a thermoacoustic unit; 1410. a high temperature heat exchanger; 1420. a heat regenerator; 1430. a low temperature heat exchanger; 160. a power piston spring cavity; 170. a first motor cooler; 180. a compression chamber; 190. communicating the chambers; 1910. a connecting member; 1911. a mating chamber; 1920. a second motor cooler; 1930. a third motor cooler;
20. a power piston; 210. a power generation unit; 2110. a connecting rod; 2120. a permanent magnet; 2130. an inner stator; 2140. an outer stator; 2150. and a copper coil.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
With reference now to fig. 1-3, an embodiment of the present invention provides a free-piston stirling generator, comprising: the device comprises a cylinder body 10 and a power piston 20, wherein an expansion cavity 110 is formed at one end of the cylinder body 10, a positioning flange 120 and a phase modulator 130 are arranged in the cylinder body 10, the phase modulator 130 is arranged on one side, close to the expansion cavity 110, of the positioning flange 120, the positioning flange 120 is connected with the phase modulator 130, a thermoacoustic unit 140 is arranged on the outer peripheral side of the phase modulator 130, the thermoacoustic unit 140 is used for generating acoustic power, and an installation cavity 1210 is formed on one side, far away from the expansion cavity 110, of the positioning flange 120; the power piston 20 is arranged in the mounting cavity 1210, one side of the power piston 20, which is far away from the thermoacoustic unit 140, is connected with the power generation unit 210, and the power piston 20 reciprocates relative to the positioning flange 120 under the action of sound power; the positioning flange 120 and the cylinder body 10 form a power piston spring cavity 160, the power spring cavity 160 is located between the thermoacoustic unit 140 and the power generation unit 210 and is communicated with the mounting cavity 1210, a first motor cooler 170 is disposed in the power piston spring cavity 160, and the first motor cooler 170 is used for cooling heat flowing from the thermoacoustic unit 140 side to the power generation unit 210 side.
It should be noted that, a part of space is additionally divided between the thermo-acoustic unit 140 and the power generation unit 210 by the positioning flange 120, and the first motor cooler 170 is disposed in the power spring cavity to prevent high-temperature heat at the side of the thermo-acoustic unit 140 from being transmitted to the side of the power generation unit 210, so that under the condition of poor external heat dissipation environment, the side of the power generation unit 210 is not affected by the higher temperature at the side of the thermo-acoustic unit 140, and the power generation unit 210 is ensured to operate efficiently and stably.
In some embodiments of the present invention, phaser 130 includes a phaser piston 1310, a gas spring piston 1220 is formed on the side of positioning flange 120 remote from power piston 20, a boss 1320 is provided inside phaser piston 1310 in correspondence with gas spring piston 1220, boss 1320 is clearance sealed from gas spring piston 1220 and divides the interior space of phaser 130 into a hot side gas spring chamber 1330 and a cold side gas spring chamber 1340. The positioning flange 120 is fixedly connected with the cylinder body 10, a gas spring piston 1220 is formed at the top of the positioning flange 120, and a gap between the phase modulator 130 and the gas spring piston 1220 is sealed and can reciprocate relative to the positioning flange 120 under the action of sound power. Further, a plate spring 1350 is provided in the phase modulator 130, and one end of the gas spring piston 1220 is connected to the plate spring 1350. Leaf spring 1350 acts to provide a reciprocating force to phase modulator 130 to facilitate stable operation of phase modulator 130.
For thermoacoustic unit 140, thermoacoustic unit 140 includes a high temperature heat exchanger 1410, a heat regenerator 1420, and a low temperature heat exchanger 1430, which are connected in sequence, where high temperature heat exchanger 1410 is disposed near one side of expansion chamber 110; the positioning flange 120 is provided with a connection hole 1230 for transmitting the acoustic power generated from the side of the thermoacoustic unit 140 to the power piston 20. That is, the thermoacoustic unit 140 primarily heats sound by heat. Specifically, thermoacoustic unit 140 is disposed on a side of positioning flange 120 close to expansion cavity 110, and a side of high-temperature heat exchanger 1410 receives external high temperature, so as to form a temperature gradient with the low-temperature heat exchange side, and when the temperature gradient is greater than a threshold value, acoustic power is generated, and pushes phase modulator 130 and power piston 20 to move. The attachment aperture 1230 is provided to facilitate the transfer of acoustic work generated by the side of the thermoacoustic unit 140 to the power piston 20.
In some embodiments of the present invention, a compression chamber 180 is formed between the top of the power piston 20 and the positioning flange 120, and the compression chamber 180 communicates with the connection hole 1230. Further, the power piston 20 is in clearance seal with the positioning flange 120, a communication chamber 190 is formed on the side of the power piston 20 away from the compression chamber 180, and the communication chamber 190 is communicated with the power piston spring chamber 160. It should be noted that the gap between the power piston 20 and the thermoacoustic unit 140 is larger and the gap is smaller near the power generation unit 210 to isolate pressure fluctuations between the compression chamber 180 and the communication chamber 190. When the heat removal temperature at the low-temperature heat exchanger 1430 side is high, part of the heat is transmitted to the communicating chamber 190 through the gap between the power piston 20 and the positioning flange 120, and the communicating chamber 190 is communicated with the power piston spring cavity 160, so that under the action of the sound power, the heat is transmitted to the power piston spring cavity 160 and is cooled and cooled by the first motor cooler 170 located in the power piston spring cavity 160. Further, the power generation unit 210 on the power piston 20 side is not affected by the high temperature on the low temperature heat exchanger 1430 side, and the operation stability of the power generation unit 210 is improved.
It should be noted that the communication chamber 190 is a part of the power piston spring chamber 160, and the communication chamber 190 is introduced for convenience of description, and will not be described herein.
Furthermore, a connecting part 1910 is arranged in the cylinder body 10, a matching cavity 1911 is formed in the middle of the connecting part 1910, and the connecting part 1910 is arranged on one side, far away from the expansion cavity 110, of the positioning flange 120; the power piston 20 is disposed between the connection 1910 and the locating flange 120, and a communication chamber 190 is formed between the connection 1910 and the locating flange 120. That is, the connecting member 1910 is spaced apart from the positioning flange 120, and a gap remaining between the connecting member 1910 and the positioning flange 120 is a communication chamber 190, and the communication chamber 190 is communicated with the power piston spring cavity 160, so that heat can be conveniently transferred into the power piston spring cavity 160 to be cooled.
For the power generation unit 210, the power generation unit 210 comprises a connecting rod 2110, the connecting rod 2110 is arranged in a matching chamber 1911 in a penetrating mode and connected with a power piston 20, a permanent magnet 2120 is arranged on the connecting rod 2110, an inner stator 2130 is arranged on the periphery of the connecting rod 2110, an outer stator 2140 opposite to the inner stator 2130 is further arranged in the cylinder body 10, and a copper coil 2150 is arranged on the periphery of one side, facing the permanent magnet 2120, in the outer stator 2140. The power piston 20 reciprocates under the action of the sound power, so that the connecting rod 2110 reciprocates up and down, and the permanent magnet 2120 on the connecting rod 2110 cuts the magnetic induction line to generate electricity.
In order to improve the heat radiation effect on the power generation unit 210 side, in some embodiments of the present invention, a second motor cooler 1920 is sleeved outside the cylinder 10, and the second motor cooler 1920 is disposed near the outer peripheral side of the power generation unit 210. In still other embodiments of the present invention, a third motor cooler 1930 is disposed inside the cylinder 10, and the third motor cooler 1930 is disposed on a side of the connecting member 1910 facing away from the positioning flange 120. That is, the second motor cooler 1920 and the third motor cooler 1930 are used for cooling the heat generated by the power generation unit 210, so as to achieve a better cooling effect, and cooperate with the effective thermal buffering of the first motor cooler 170 to enable the power generation unit 210 to work in a lower temperature region with high efficiency and high reliability, wherein the embodiment in which the third motor cooler 1930 is disposed inside the cylinder 10 is more suitable for application scenarios with larger power generation capacity and larger heat dissipation capacity of the motor.
That is, the power piston 20 and the gas spring cavity are arranged in front, and when the heat dissipation condition of the application scene is poor and the heat dissipation temperature at the side of the thermoacoustic unit 140 is required to be high, for example, in a heat dissipation environment at least higher than 200 ℃, the first motor cooler 170 can thermally buffer the heat and adapt to the temperature gradient change. Meanwhile, the side of the power generation unit 210 is also provided with a second motor cooler 1920 or a third motor cooler 1930, so that independent heat removal at a lower temperature can be performed, the power generation unit 210 operates at a lower temperature, the operation is more efficient and stable, meanwhile, the structure can also effectively reduce the outer diameter of the power generation mechanism, the diameter of the power generation mechanism can be equal to that of the side of the thermoacoustic unit 140 after the power generation unit is reasonably designed, and the reduction of the volume and the weight of the whole machine is facilitated.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A free piston stirling generator, comprising:
the phase modulator is arranged on the side, close to the expansion cavity, of the positioning flange and is connected with the phase modulator, a thermoacoustic unit is arranged on the peripheral side of the phase modulator and is used for generating acoustic power, and an installation cavity is formed on the side, far away from the expansion cavity, of the positioning flange;
the power piston is arranged in the mounting cavity, one side of the power piston, which is far away from the thermoacoustic unit, is connected with a power generation unit, and the power piston moves in a reciprocating manner relative to the positioning flange under the action of the acoustic power; wherein the content of the first and second substances,
the positioning flange and the cylinder body form a power piston spring cavity, the power spring cavity is positioned between the thermoacoustic unit and the power generation unit and communicated with the mounting cavity, and a first motor cooler is arranged in the power piston spring cavity and used for cooling heat flowing from the thermoacoustic unit side to the power generation unit side.
2. The free piston stirling generator of claim 1 wherein the phase modulator comprises a phase modulator piston, a gas spring piston is formed on the side of the positioning flange remote from the power piston, a boss is provided inside the phase modulator piston and corresponds to the gas spring piston, the boss is sealed from the gas spring piston by a gap and divides the interior space of the phase modulator into a hot end gas spring cavity and a cold end gas spring cavity.
3. A free piston stirling generator in accordance with claim 2 wherein a leaf spring is provided within the phase modulator, the gas spring piston being connected at one end to the leaf spring.
4. The free piston stirling generator of claim 1, wherein the thermoacoustic unit comprises a high temperature heat exchanger, a regenerator and a low temperature heat exchanger connected in series, the high temperature heat exchanger being disposed adjacent to one side of the expansion chamber;
and the positioning flange is provided with a connecting hole for transmitting the sound power generated by the side of the thermoacoustic unit to the power piston.
5. A free piston Stirling generator according to claim 4, wherein a compression chamber is formed between the top of the power piston and the locating flange, the compression chamber being in communication with the connection aperture.
6. A free piston Stirling generator according to claim 5, wherein the power piston is gap sealed to the locating flange, a side of the power piston remote from the compression chamber forming a communication chamber, the communication chamber communicating with the power piston spring chamber.
7. A free piston Stirling generator according to claim 6, wherein a connector is further provided in the cylinder, a fitting chamber being formed in the middle of the connector, and the connector being provided on the side of the positioning flange remote from the expansion chamber;
the power piston is arranged between the connecting piece and the positioning flange, and the connecting piece and the positioning flange form the communicating cavity.
8. A free piston stirling generator in accordance with claim 7, wherein the power generating unit comprises a connecting rod inserted into the mating chamber and connected to the power piston, the connecting rod is provided with a permanent magnet, an inner stator is provided around an outer circumference of the connecting rod, an outer stator is provided in the cylinder opposite to the inner stator, and a copper coil is provided inside the outer stator and around a side facing the permanent magnet.
9. A free piston Stirling generator according to claim 7, wherein a second motor cooler is provided inside the cylinder, the second motor cooler being provided on the side of the connection member facing away from the locating flange.
10. A free piston stirling generator in accordance with claim 1, wherein a third motor cooler is provided around the outside of the cylinder block, the third motor cooler being provided near the outer peripheral side of the power generation unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210108008.4A CN114458473B (en) | 2022-01-28 | 2022-01-28 | Free piston Stirling generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210108008.4A CN114458473B (en) | 2022-01-28 | 2022-01-28 | Free piston Stirling generator |
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| CN114458473A true CN114458473A (en) | 2022-05-10 |
| CN114458473B CN114458473B (en) | 2024-04-19 |
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| CN202210108008.4A Active CN114458473B (en) | 2022-01-28 | 2022-01-28 | Free piston Stirling generator |
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| CN215213717U (en) * | 2021-06-29 | 2021-12-17 | 中国科学院理化技术研究所 | Two-stage free piston Stirling generator |
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| CN114458473B (en) | 2024-04-19 |
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