EP3301287A1 - Double action floating piston-stirling-circulating machine with linear generator - Google Patents

Abstract

A free-piston Stirling cycle machine (0) comprising a hermetically sealed pressure housing (3) with a working section (I) and at least one displacer section (II) adjoining the working section (I) is to be provided, wherein in the interior of the working section (FIG. I) at least one working piston (11 ') is movable, forming part of a linear generator (1), and a regenerator (2) is arranged in the at least one displacer section (II) so that upon filling of the pressure housing (3) with a working gas ( 11) and upon application of a temperature difference between the displacer section (II) at elevated temperature (T2) and the rest of the pressure housing (3) at low temperature (T1, T1 <T2) mechanical work by the working piston (11 ') can be made and from the linear generator (1) is convertible into electrical energy.

Description

Technical area

The invention relates to a Stirling engine according to the preamble of patent claim 1.

The Stirling engine or free piston Stirling cycle machine, comprising a housing with a linear generator which separates the two with working gas filled chambers in the middle. The invention converts thermal energy into electrical energy. In the text is used for simplicity, instead of the free-piston circulating machine, the name Stirling machine.

State of the art

Stirling engines have been used as efficient thermo-mechanical devices for converting thermal energy into mechanical energy for about 200 years.

Similarly, Stirling cycle refrigerators are used to convert mechanical energy into pumping heat energy from a cooler temperature to a warmer temperature. These refrigerators are often connected to a linear motor or alternator. A Stirling engine may drive a linear alternator to generate electrical power. Conversely, a linear alternator can also drive a Stirling engine to produce refrigeration.

Like in the DE 10 2008 041 076 described, for the operation of a Stirling engine, a hermetically sealed housing is very important. The efficiency of the Stirling engine is dependent on the highest possible output pressure of the working gas. The Stirling engine described in the above patent is considered to be the closest prior art. Due to the complex internal structure of the document DE 10 2008 041 076 described Stirling engine, the technology must be enclosed in a pressure-resistant, parent housing. This pressure-resistant housing, developed specifically for this Stirling engine, represents a high cost factor because it is exposed to a double load due to the internal gas pressure and the external heat energy of about 500 ° C. Therefore, the use of high quality and therefore expensive materials is mandatory, which additionally complicate the weight of the Stirling engine. The aim of the inventive Stirling engine was therefore to introduce the construction in a simple geometric shape, which withstands the pressures occurring and is available in commercially available dimensions and shapes.

In the DE 10 2008 041 076 described Stirling engine works like all other known Stirling machines of this type against the resistance of a mechanical spring, a diaphragm or the like. The task of this spring is to bring the working piston after the expansion of the working gas back to the starting position, so that the cycle can start again from the beginning. Since energy is withdrawn from the working piston by compressing the spring, this adversely affects the efficiency.

The Stirling engine according to the invention can dispense with a spring or the like, since pressure forces are alternately generated by heating the working gas on both sides of the working piston or linear generator. Therefore, the Stirling engine according to the invention is also referred to as double-acting. The double action of the Stirling engine causes a much more harmonious run, as the movement of the working piston from one side to the other done in the same way and no differences occur in the acceleration and deceleration. On a vibration compensation as in the document DE10 2008 041 076 can therefore be dispensed with.

Another disadvantage of existing Stirling engines is the lack of efficient power control. By regulating the heat supplied, a minimum and sluggish power regulation can be achieved. The Stirling engine reacts strongly delayed to the changed energy effects. On the speed of the power stroke, especially the displacer has a great influence. This is mechanically connected in conventional Stirling machines with the working piston. This connection is usually achieved via a flywheel.

The connection of the working piston with the displacement piston by means of degree of inertia has the disadvantage that the displacement piston is significantly slowed down when changing direction, in order to accelerate slowly thereafter. This slowdown reduces the efficiency of the Stirling engine. Through this connection, the displacer can not be used independently of the working piston for power control.

The connection of the displacer piston and the working piston by means of the degree of inertia requires moving mechanical components in the form of e.g. Ball bearings are subjected to mechanical and thermal stresses and make the production more expensive. Also, these components are maintenance intensive and therefore have a negative impact on the maintenance costs.

These described mechanical connections also have the disadvantage that the housing in which the space of the working gas is with the displacement piston, must be penetrated. This penetration can not be permanently sealed and leads to a reduction in the efficiency.

Presentation of the invention

The present invention has the object to overcome the above-mentioned disadvantages and to develop a Stirling engine, which has an increased efficiency and achieves an increased efficiency at already low temperature differences, so that can be dispensed with high working gas pressures and working gas temperatures.

The aim of the inventive Stirling engine is not to achieve a very high output power, but to be able to use low temperature differences below 100 ° C. As a result, the building materials used are not exposed to high temperatures, which leads to lower production costs and to an extension of the service life.

In the Stirling engine according to the invention, the displacement piston can be moved independently of the working piston. This movement takes place by means of an electromagnetic field, which is generated by a coil outside the housing and by the change of polarities forces the displacer to a linear movement in the desired cycle.

Due to the low temperature difference, it is possible to use natural temperature differences and to convert their heat into electrical energy. The Stirling engine according to the invention thus opens up completely new areas of application and can finally emancipate itself from fuels such as wood, oil or gas. At present, existing Stirling engines are still heated by conventional fuels to achieve the necessary temperature difference. This deteriorates the CO2 balance and leads to further particulate matter pollution by the combustion.

Also for waste heat utilization of existing machines, the Stirling engine according to the invention is suitable, since part of the waste heat energy can be exploited.

The invention will be described below with reference to an embodiment.

Brief description of the drawings

Figur 1a

zeigt einen Längsschnitt der erfindungsgemässen Stirlingmaschine in Richtung Achse R mit einer möglichen Stellung der im Abschnitt II und II' dargestellten Regeneratoren

Figur 1b

zeigt einen Längsschnitt der erfindungsgemässen Stirlingmaschine in Richtung Achse R mit der entgegengesetzten Stellung der Regeneratoren gegenüber Figur 1a.

Figur 1c

zeigt einen vergrösserten Längsschnitt, im Bereich des Lineargenerators, der erfindungsgemässen Stirlingmaschine in Richtung Achse R.

Figur 2

zeigt einen Querschnitt auf Höhe des Regenerators der erfindungsgemässen Stirlingmaschine, quer zur Achse R, während

Figur 3

einen Querschnitt auf Höhe des Lineargenerators des erfindungsgemässen Stirlingmaschine, quer zur Achse R zeigt.

Figur 4

zeigt einen Längsschnitt einer abgewandelten Stirlingmaschine in Richtung der Achse R, wobei das Druckgehäuse einen konstanten Querschnitt aufweist.

Figur 5

zeigt einen Längsschnitt durch zwei miteinander in Reihe gekoppelte Stirlingmaschinen mit nur einem Druckgehäuse.

The drawings used to explain the embodiments show:

FIG. 1a

shows a longitudinal section of the inventive Stirling engine in the direction of axis R with a possible position of the regenerators shown in section II and II '

FIG. 1b

shows a longitudinal section of the inventive Stirling engine in the direction of axis R with the opposite position of the regenerators opposite FIG. 1a ,

Figure 1c

shows an enlarged longitudinal section, in the region of the linear generator, the inventive Stirling engine in the direction of axis R.

FIG. 2

shows a cross section at the height of the regenerator of the inventive Stirling engine, transverse to the axis R, while

FIG. 3

a cross section at the level of the linear generator of the inventive Stirling engine, transverse to the axis R shows.

FIG. 4

shows a longitudinal section of a modified Stirling engine in the direction of the axis R, wherein the pressure housing has a constant cross-section.

FIG. 5

shows a longitudinal section through two together in series coupled Stirling machines with only one pressure housing.

description

An embodiment of a free-piston Stirling cycle machine 0 or a Stirling engine 0 is in the FIGS. 1 to 5 shown.

As in Fig. 1a 3, the Stirling engine 0 has three sections divided into section I, section II and section II ', all three sections penetrating a hollow cylindrical pressure housing 3 which is hermetically sealed and has closed end surfaces. The pressure housing 3 holds in the interior of the section I, a linear generator 1, which consists of a working piston 11 'with a plurality of integrated permanent magnets and is sealed with piston sealing rings 13', and a stator with windings 12 '. The working piston 11 'is the rotor of the linear generator 1. The stator or the windings 12' surround the working piston 11 ', spaced therefrom in the section I of the linear generator 1.

In sections II and II ', left and right of section I, 3 regenerators 2 and displacer 2 are disposed within the pressure housing and the interior of the pressure housing 3 is filled with a working gas 11. The regenerators 2 further consist of a permanent magnet 21 'and slip rings 22' made of abrasion-resistant plastic. The pressure housing 3 has at the two end faces in each case a filling opening 16 for the working gas 11. The working gas 11 is distributed in the interior of the sections II, II ', the pressure housing 3 and is filled once in the production before thermal insulation on the pressure housing 3 are arranged. The Stirling engine 0 presented here can be defined as a gamma type, since working pistons 11 'and both regenerators 2 are accommodated in the same cylindrical interior of the pressure housing 3. The working piston 11 'and the regenerators 2 are mounted linearly movable in the direction of the axis R in the pressure housing interior, wherein there is no mechanical connection between the working piston 11' and regenerators 2. Both Regenerators 2 and the working piston 11 'are in the position according to Fig. 1a maximally deflected to the left.

As in Fig. 1a shown, located outside the pressure housing 3 in the middle of the sections II and II ', in each case at least one induction coil 5, this is wound around the pressure housing 3. The induction coil 5 is operated as an electromagnet, wherein a magnetic field is generated by current application, which is used to move the regenerators 2. The induction coil 5 divides a heat transfer medium 14, here in the form of foamed metal 14, into two parts. Since heat energy is to be transferred as efficiently as possible to the working gas 11 in the pressure housing 3 in the second sections II, II ', the heat transfer means 14 are important.

A jacket 22 surrounds the foamed metal 14 and the induction coils 5 along the second sections II and II '. In the second sections II, II ', the jacket 22 is enclosed by a surrounding thermal insulation 13, the heat supply regions 9 and heat dissipation regions 10. Within this heat insulation 13, advantageously in the front edge area, a control module 6 with integrated interfaces such as WLAN and Bluetooth, a rechargeable battery 7 and a frequency converter 8 is positioned. An electric line 21 carries the power of the frequency converter 8 to the outside. In the heat insulation 13 lines 19 are arranged for a heat transfer fluid, preferably water. These lines 19 include solenoid valves 18 and sensors 17, wherein the lines 19 extend substantially parallel to the axis R.

A closed panel 12 surrounds the Stirling engine 0 in the second sections II and II ', surrounding the thermal insulation 13. The lines 19 for the fluid are mounted within the panel 12 in the second sections II, II 'extending.

The first section I, in which the linear generator 1 is arranged, encloses a perforated casing 20, which is a cooling of the first Section I allowed. Between the perforated panel 20 and the pressure housing 3 cooling fins 4 are arranged at right angles to the axis R, which improve the heat output of the linear generator 1 to the room air

As in Fig. 1a is shown in the sections II and II ', in the heat supply regions 9, on the outer two sides of the Stirling engine 0, heat supplied T2. In the heat dissipation regions 10, left and right of the first section I and the linear generator 1 with working piston 11 ', heat is dissipated T1. For this, the lines 19 are provided, through which hot and cold water is conducted or discharged into the heat supply regions 9 and heat dissipation regions 10.

FIG. 1b puts the Stirling engine 0 over the Fig. 1a The regenerator 2 of the second section II is deflected maximally in the direction of the working piston 11 ', while the regenerator 2 of the second section II' is at a maximum away from the working piston 11 'in the direction of the outer edge of the pressure housing 3 is deflected.

Fig. 1c represents the section I with the linear generator 1, opposite Fig. 1a enlarged, with a working piston 11 'consisting of permanent magnets which are movable with the working piston 11'. Piston rings 13 'are arranged on the left and right at the outer end of the working piston 11', whereby the linear movement of the working piston 11 'is simplified.

The linear generator 1 also has a stator with a plurality of windings 12 '. The linear generator 1 is completely enclosed in the pressure housing 3. The pressure housing 3 has the outer wall in the region of the linear generator 1, cooling fins 4. Through the region of the cooling fins 4, the lines 19 are arranged performed.

The FIG. 2 represents a cross section 90 ° to the axis R of in Fig. 1a shown Stirling engine 0, in section II, at the height of a regenerator 2 in the heat supply region 9, with the permanent magnet 21 '. The regenerator 2 is located within the pressure housing 3, this in turn is surrounded by the foamed metal 14 as a heat transfer means 14. The sheath 22 closes the foamed metal 14 from the heat insulation 13 from. Within the heat insulation 13, the lines 19 and the electric line 21 are guided. All components are in turn enclosed within the panel 12. The lines 19 and the electrical lines 21 are embedded in the thermal insulation 13 only in contact with ambient air and not with the heat transfer fluid flowing through the lines 19 and is introduced through the jacket 22 in the heat transfer means 14.

The FIG. 3 shows the section 2, in section I, transverse to the linear generator 1. In the center of FIG. 3 is the working piston 11 'comprising permanent magnets, which is surrounded by a gap spaced from the stator with windings 12'. The pressure housing 3 is in turn surrounded by the cooling fins 4. Through the cooling fins 4, the lines 19 are guided for the heat transfer fluid. All described components are in turn enclosed in the perforated panel 20.

Ways to carry out the invention

The Stirling engine 0 presented here, as shown in the figures, converts thermal energy into electrical energy. To operate the Stirling engine 0, a heat source is necessary, which introduces thermal energy within the sections II and II 'into the heat supply regions 9 by increased temperature T2. In the illustrated embodiment, warm fluid, for example, water is supplied via the lines 19 as a heat transfer fluid. The flow rate is measured by means of sensors 17. These data go to the control module 6, which turn by means of solenoid valves 18 can regulate the flow. The supplied heat passes via the lines 19 in the region of the heat transfer means 14 in the form of the metal foams 14, the metal foams 14 transfer the heat energy from the heat transfer fluid through the pressure housing 3 to the working gas 11. Alternatively to the metal foams 14 can also normal slats made of metal as a heat transfer medium 14 are used.

Usually, the pressure housing 3 is created in three parts, which are then joined together. This ensures that the linear generator 1 can be mounted or replaced.

As the working gas 11, helium is advantageously used. In the heat dissipation region 10 with low temperature T1, in turn, heat energy is conducted away via the lines 19. Between the heat dissipation regions 10 with low temperature T1 and heat supply regions 9 with increased temperature T2 now arises outside and within the pressure housing 3, a temperature difference.

Like in the FIG. 1a 2, in the section II, the regenerator 2 displaces the working gas 11 from the elevated-temperature heat supply regions 9 into the low-temperature heat dissipation region 10. In this heat dissipation region 10, the working gas 11 releases the heat energy via the pressure housing 3 to the metal foam 14 again. Since the metal foam 14 is flushed by the heat transfer fluid, such as water, the heat energy is dissipated. The working gas 11 thereby cools and the internal pressure on the side of the section II of the linear generator 1 decreases. On the opposite side of the linear generator 1 in section II 'happens at the same time the opposite. The regenerator 2 displaces the working gas 11 from the cold area 10 with T1 to the warm area 9 T2 of the pressure housing 3 Fig. 1a described positions of the regenerators 2, arises in section II a pressure reduction because heat led away and in section II 'an increase in pressure because heat is supplied. This pressure gradient forces the working piston 11 'to move along the axis R in the direction of section II.

After this work cycle, the regenerators 2 as in Fig. 1b shown on the respective opposite side, within the sections II and II ', along the axis R by means of a reversal of the polarity of the magnetic field of the induction coil 5 moves. By this movement, the working gas 11 as in section II of FIG. 1b shown in the area 9 with increased temperature T2 displaced. As a result, it is heated and presses the working piston 11 'along the axis R in the direction of the section II', while in section II 'the regenerator 2 is in the region of elevated temperature 9 T2 and the working gas 11 in the low temperature region 10 T1 is displaced. As a result, the pressure of the working gas in section II 'collapses and reduces the resistance of the working piston 11' to penetrate into this section.

The regenerators 2 are short-term heat storage and absorb heat energy on the one hand on the working gas 11 in order to give you back to the working gas 11 on the opposite side. Advantageously, the regenerators 2 are made of material with high heat capacity. Since the regenerators 2, temporally delay this heat flow, a higher temperature gradient between the working gas volume 11 left and right of the regenerators 2. This causes the working gas 11 expands and acts along the axis R on the end face of the working piston 11 'of the linear generator. 1 By the piston ring 13 'is achieved that the working gas 11 does not penetrate into the linear generator 1. Between the divided by the linear generator 1 cavity of the pressure housing 3, now creates a pressure gradient of the working gas 11. The forces acting on the piston 11 'forces set this parallel to the axis R in motion. The working piston 11 'provided with permanent magnets induces an electric voltage by means of its magnetic field via the stator with windings 12'. This tension is achieved by means of Electric lines 21 supplied to the frequency converter 8, this increases the frequency to the usual 50 Hz so that the power generated can be supplied to an external consumer.

The double action of the Stirling engine 0 is achieved in that the working gas 11 can act alternately on both sides of the linear generator 1 on the working piston 11 'by being exposed to different temperatures simultaneously on both sides of the linear generator 1 as described above and the pressure is applied to the one side increased, sinking simultaneously on the opposite side.

The induction coil 5 generates a directional magnetic field for moving the regenerators 2, it consists of a copper wire winding and is supplied via the control module 6 with power. The induction coils 5 thus form an electromagnet with which a controlled positioning of the regenerators 2 is possible. The regenerators 2 must therefore be permanently magnetic or, as shown, be provided with a permanent magnet 21 '. In order to keep the frictional resistance as low as possible and to avoid wear of the regenerator, slip rings 22 'made of metal or plastic are used.

To start the Stirling engine 0 requires additional energy. This is provided via the battery 7. The battery 7 is charged during operation of the Stirling engine 0 by means of specially generated electrical energy to provide the necessary starting energy after a standstill, for the movement of the regenerators 2 by means of the induction coil fifth

The control module 6 monitors by means of the sensors 17, the heat flow which is supplied through the line 19 for the fluid in the Stirling engine from the outside. The control module 6 consists of a processor for processing appropriate data such as temperature, flow rate, voltage and current. Based on The control module 6 regulates the flow of the fluid by means of the solenoid valves 18. In a first embodiment, the control module 6 provides an interface, optionally via Bluetooth, WLAN, or USB interface. This interface is used to control, monitor and adjust the Stirling engine 0 for the user.

The Stirling engine 0 is completed in section I to the linear generator 1 with a perforated panel 20 to ensure that the waste heat of the linear generator 1 can be discharged through the cooling fins 4 and through the perforated panel 20 to the ambient air.

A double action of the Stirling engine 0 is achieved here by the fact that the two displacement sections II, II 'are arranged on both sides of the working section I, wherein the pressure housing 3 encloses an interior, in which the working gas 11, the working piston 11' and both regenerators 2 linearly are movably arranged. The regenerators 2 move on both sides of the working section I and thus on both sides of the linear generator 1. For high efficiency, the working gas 11 should not compensate for the sections II and II 'on the working section I. The piston rings 13 'and slip rings 22' prevent the working gas 11 from leaving sections II and II 'and entering section I. Here, the pressure housing 3 is built around the linear generator 1 to keep the working gas 11 flowing past the piston ring 13 'and slip rings 22' in the closed system. When the Stirling engine 0 or working piston 11 'and regenerators 2 are stationary, the working gas 11 is equalized again within the entire pressure housing 3. In practice, it will also penetrate into section I since pressures of about 200 bar are applied. If the working gas 11 could compensate without resistance between the displacer sections II and II ', no pressure gradient between the sections I, II, II' would arise and the working piston 11 'would not be driven.

So that it can be dispensed with a return spring, which is pushed back in classic Stirling engines of the working piston back to the starting position, two sections II, II 'to the working section I are arranged laterally here. The problem with a return spring is that this kinetic energy is consumed and the working piston must press against the spring. Here, mutually positive pressure and negative pressure is generated on both sides of the linear generator 1, so that the working piston 11 is movable with less resistance between its deflection positions.

In a slightly modified variant, the Stirling engine 0 can be designed such that the linear generator 1 has the axis R and the pressure housing 3 is designed angled in the region of the two regenerators 2 by an angle greater 0 ° relative to the axis R. Accordingly, then the displacement sections II, II 'are arranged angled to the first section I, preferably at an angle relative to the axis R, which forms a zero line. In the case of a bend, an angle of 90 ° would preferably be selected so that the Stirling engine 0 has a U-shape.

As tests have shown, it is possible or advantageous to arrange the stator 12 'with windings outside of the pressure housing 3, in contrast to those in FIGS FIG. 1a and 1b presented version. The stator 12 'is arranged outside of a here designed tubular pressure housing 3 with a constant cross-section. In this case, the windings of the stator 12 ', the pressure housing 3 enclosing, wound. This is in FIG. 4 recognizable. In a modified form here are the control module 6 and various electrical lines 21 outside the Stirling engine 0 are arranged, wherein the electric wires 21 are guided to the pressure housing 3 to the induction coils 5. Not shown here are the battery 7 and the frequency converter 8, which are outside the Stirling machine 0, more specifically arranged outside the panel 12. Instead of the foamed metal as heat transfer means 14, a plurality of cooling fins 4 are provided on the pressure housing 3 here.

In a preferred embodiment of the Stirling engine 0 ', in which vibrations are largely prevented, a series connection of at least two Stirling machines 0 is provided. Preferably, both Stirling machines are 0, a single closed pressure housing 3 having, aligned along the axis R, arranged. By one filled with working gas 11 pressure housing 3 is an operative connection of the sections I, I ', II. II', II ", II '" reachable. All displacer sections II, II ', II ", II'" with regenerators 2, 2 ', 2 ", 2'" and all working sections I, I 'are spaced from one another in the same pressure housing 3. At least two linear generators 1, 1 'are constructed on both sides in the longitudinal direction R of two regenerators 2, 2', 2 ", 2 '" surrounding each. Both all regenerators 2, 2 ', 2 ", 2"', as well as all the working piston 11 'are arranged within the same pressure housing 3 movable and operatively connected. Again, the regenerators 2, 2 ', 2 ", 2'" permanent magnetic or have a permanent magnet 21 'on. A plurality of induction coils 5 surround the displacer sections II, II ', II ", II'" at least partially. The induction coils 5 are arranged outside the pressure housing 3 as close as possible to the wall of the pressure housing 3 within the panel 12.

The forces of the respective opposite movements of the working piston 11 'and the displacer cancel each other almost on, so that a quiet low-vibration running of the combined Stirling engine 0' results.

Applicants refer to the Stirling engine 0 disclosed herein and a series thereof as delta Stirling, with both embodiments operating without harmful refrigerants, which is the ultimate comparative competing advantage.

Stirling machines have long been used for cooling in cryotechnology to reach very low temperatures. The delta Stirling 0 shown here can be used anywhere, the simple delta design is ideal for small designs, the fridge and the Air conditioning are mandatory. Its unique functionality is efficient, cost-effective and environmentally friendly. In the case of a conventional refrigerant, the condensation pressure must always be reached via a compressor, the condensation pressure being dependent on the refrigerant, so that it can be evaporated at the desired temperature. In the Stirling machines 0 here also small delta temperatures can be driven. The regulation runs only over the compression ratio (gas) and the clock frequency of the regenerator or the regenerators.

LIST OF REFERENCE NUMBERS

• 0 Free-piston Stirling cycle machine / Stirling engine
• 1 linear generator
  • 11 'working piston (rotor with permanent magnets)
  • 12 'stator with windings
  • 13 'piston ring
• 2 regenerators (displacement piston)
  • 21 'permanent magnet
  • 22 'slip rings
• 3 pressure housing
• 4 cooling fins
• 5 induction coil
• 6 control module
• 7 battery
• 8 frequency converters
• 9 heat supply area / elevated temperature T2
• 10 heat dissipation area / low temperature T1
• 11 working gas
• 12 cladding
• 13 thermal insulation
• 14 heat transfer medium / foamed metal
• 15 Thermal break with seal
• 16 filling opening for working gas
• 17 sensors
• 18 solenoid valves
• 19 line for fluid
• 20 Perforated paneling
• 21 electric cable
• 22 sheathing
• R axis
• I first section
• II, II 'displacement sections / second sections

Claims (14)

Stirling machine (0) comprising a hermetically sealed pressure housing (3) with a working section (I) and at least one of the working section (I) adjacent displacement section (II), wherein in the interior of the pressure housing (3) in the working section (I) at least one working piston (11 ') movable, forming part of a linear generator (1) is arranged and in the at least one displacer section (II) a regenerator (2) is arranged so that upon filling of the pressure housing (3) with a working gas (11) and upon exposure a temperature difference between the displacer section (II) at elevated temperature (T2) and the rest of the pressure housing (3) at low temperature (T1, T1 <T2) mechanical work by the working piston (11 ') and the linear generator (1) in electrical Energy is convertible,
characterized in that
a second displacer section (11 ') with a regenerator (2') from the working section (I) and first displacer section (II) spaced in the same pressure housing (3) is arranged, so that the Verdrängerabschnitte (II, II ') along the working section (I) a longitudinal axis (R) surrounded on both sides directly, wherein the two regenerators (2) are permanently magnetic or a permanent magnet (21 ') and in such a way with induction coils (5), which each Verdrängerabschnitt (II, II') are operatively connected, that by Setting the current flow through the induction coils (5), the position of the regenerators (2, 2 ') is variable. Stirling engine (0) according to claim 1, wherein on the working piston (11 ') piston rings 13' and on the regenerators (2) slip rings (22 ') are arranged, which makes it difficult to exchange a working gas (11) within the pressure housing (3) between the first section (I) and the displacement sections (II, II '). Stirling machine (0) according to claim 1, wherein a stator (12 ') with windings of the linear generator (1) is arranged completely in the pressure housing (3) and the working piston (11') is the rotor of the linear generator (1). Stirling machine (0) according to claim 1, wherein a stator (12 ') with windings of the linear generator (1) surrounding the pressure housing (3) outside the pressure housing (3) is arranged, wherein the working piston (11') of the rotor of the linear generator (1 ). Stirling machine (0) according to one of the preceding claims
characterized in that the Stirling engine (0) comprises a control module (6) which collects and processes data such as temperature and flow rate of a heat transfer fluid via sensors (17) and the flow rate through solenoid valves (18) is adjustable. A stirling machine (0) according to claim 5, wherein the control module (6) can regulate the movement stroke of the regenerators (2, 2 ') by reversing the polarity of the induction coils (5) and thereby directly affect the stroke of the working piston (11') which controls the induced, recovered amount of electrical energy determined. Stirling machine (0) according to one of the preceding claims
characterized in that a rechargeable battery (7) provides the necessary starting energy necessary for starting the Stirling engine (0) to drive the regenerators (2) via the induction coil (5). to move, wherein the battery (7) during operation by converted energy of the linear generator (1) is rechargeable. Stirling machine (0) according to one of the preceding claims, wherein the regenerators (2, 2 ') run maintenance-free by means of integrated dry-running sliding rings (22'), in particular made of abrasion-resistant plastics. Stirling machine (0) according to one of the preceding claims, wherein the displacer sections (II, II ') outside the pressure housing (3) with a heat transfer means (14) are enveloped, which is permeable to a heat transfer fluid. A stirling machine (0) according to claim 9, wherein the heat transfer means (14) is in the form of a foamed metal (14) whose porosity allows the heat transfer fluid to flow therethrough. Stirling engine (0) according to any one of claims 4 to 10, wherein the control module (6) has a wireless interface such as WiFi or Bluetooth and can be monitored and controlled by means of an external PC, tablet or smartphone. Stirling machine (0) according to one of the preceding claims, wherein a frequency converter (8) converts the current induced by the linear generator (1) to an AC frequency of 50 Hz, so that the electrical energy can either be fed directly into the power grid or supplied to a load. Stirling machine (0) according to one of the preceding claims, wherein each displacer section (II, II ') on its side remote from the working section (I) a heat supply region (9) and at his side facing the working section (I) has a heat dissipation region (10), in which a heat transfer fluid by means of lines (19) can be added and discharged. Stirling machine (0) according to one of the preceding claims, wherein a series circuit of at least two linear generators (1, 1 ') with each of the linear generators (1, 1') on both sides in the longitudinal direction (R) of the linear generators (1, 1 ') surrounding regenerators ( 2, 2 ', 2 ", 2"') and both all regenerators (2, 2 ', 2 ", 2"'), as well as all the working piston (11 ') within the same pressure housing (3) arranged to be movable and operatively connected are.

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