Flexible piston Stirling generator

Abstract

The invention relates to the technical field of Stirling generators, in particular to a flexible piston Stirling generator which comprises a shell, a gas distribution piston, a power piston, a power generation assembly and a heat exchange assembly. The gas distribution piston comprises a shell, a first end face and a second end face, the first end face and the second end face are connected to the two ends of the shell, the first end face and the second end face are flexible end faces, the area difference exists between the first end face and the second end face, and the first end face and the second end face of the gas distribution piston generate certain elastic deformation due to pressure changes of gas working media in the expansion cavity and the compression cavity. And under the cooperation of the power piston and the gas working medium circulation, the generator continuously generates electric energy. By adopting the flexible piston Stirling generator, the friction between the air distribution piston and the inner wall of the air cylinder and the friction between the air distribution piston rods can be reduced, the friction loss is reduced, the working frequency of the generator is improved, and the power generation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of Stirling generators, and in particular to a flexible piston Stirling generator. Background Art

[0002] A Stirling generator is a closed-cycle external combustion generator. The working process of a Stirling generator is that the gas working medium flows back and forth between the expansion chamber and the compression chamber, and is heated by an external heat source in the expansion chamber and cooled by an external cold source in the compression chamber. The resulting gas pressure changes drive the piston to move, thereby outputting mechanical energy to the outside, which is then converted into electrical energy by the power generation device.

[0003] The free piston Stirling generator is a typical Stirling generator. The free piston Stirling generator eliminates the moving parts used to connect the valve piston and the power piston. The valve piston reciprocates at the equilibrium position to achieve phase adjustment. The valve piston and the power piston cooperate through the transmission of gas pressure, and finally the reciprocating motion of the power piston outputs mechanical energy and converts it into electrical energy.

[0004] In the structure of a free piston generator, the valve piston and the power piston will produce friction with the inner wall of the cylinder during the reciprocating motion. At the same time, friction will also occur between the valve piston rod and the power piston, causing friction resistance loss, reducing the operating frequency of the generator and affecting the power generation efficiency. Summary of the invention

[0005] The present invention provides a flexible piston Stirling generator, which is used to solve the defect in the prior art that the free piston Stirling generator is prone to affect the power generation efficiency due to friction loss during the power generation process.

[0006] The present invention provides a flexible piston Stirling generator, comprising a shell, a gas distribution piston, a power piston, a power generation component and a heat exchange component, wherein the gas distribution piston is fixed inside the shell, the gas distribution piston comprises an outer shell and a first end face and a second end face connected to both ends of the outer shell, the first end face and the second end face are both flexible end faces, suitable for elastic deformation under pressure, and there is an area difference between the first end face and the second end face; an expansion chamber is formed between the gas distribution piston and the first end inner wall of the shell; the power piston is arranged inside the shell, a compression chamber is formed between the power piston and the gas distribution piston, and a back pressure chamber is formed between the power piston and the second end inner wall of the shell; the power generation component is connected to the power piston, and is suitable for converting the mechanical energy of the power piston into electrical energy output; the heat exchange component is arranged inside the shell, and the heat exchange component comprises a heater, a heat regenerator and a cooler connected in sequence, the heater is connected to the expansion chamber, and the cooler is connected to the compression chamber.

[0007] According to a flexible piston Stirling generator provided by the present invention, the regenerator includes an inner ring wall of the regenerator and a wire mesh arranged on the outer peripheral surface of the inner ring wall of the regenerator, the inner ring wall of the regenerator is fixedly installed on the shell, the gas distribution piston is fixed to the inner wall of the inner ring wall of the regenerator, the expansion chamber is formed between the first end face and the first end inner wall of the shell, the heater is fixedly installed in the expansion chamber, and is used to heat the gas working medium in the expansion chamber, the compression chamber is formed between the second end face and the power piston, and the cooler is connected to the end of the inner ring wall of the regenerator, and is used to cool the gas working medium in the compression chamber.

[0008] According to a flexible piston Stirling generator provided by the present invention, the gas distribution piston includes a first piston part, a second piston part and a gas distribution piston support rod, the first piston part includes a first outer shell and the first end face, the first outer shell is fixed to the inner wall of the inner ring wall of the heat exchanger, and the edge of the first end face is fixedly connected to the first end of the first outer shell.

[0009] The second piston part includes a second shell and the second end surface. The second shell is fixed to the inner wall of the inner ring wall of the regenerator. The edge of the second end surface is fixedly connected to the first end of the second shell. The second end of the second shell is connected to the second end of the first shell.

[0010] One end of the gas distribution piston support rod is connected to the first end surface, and the other end is connected to the second end surface.

[0011] According to a flexible piston Stirling generator provided by the present invention, the gas distribution piston also includes a charging valve, which is arranged on the shell and is used to inflate the inside of the gas distribution piston to balance the internal and external pressure differences.

[0012] According to a flexible piston Stirling generator provided by the present invention, the first shell is a variable diameter shell, the second shell is a full diameter shell, and the inner diameter of the first shell gradually increases from the second end of the first shell to the first end of the first shell, so that the area of ​​the first end surface is larger than the area of ​​the second end surface.

[0013] According to a flexible piston Stirling generator provided by the present invention, the valve piston support rod includes a first support member and a second support member, the first end of the first support member is connected to the center of the first end surface, the first end of the second support member is connected to the center of the second end surface, and the second end of the first support member is connected to the second end of the second support member by internal and external threaded assembly.

[0014] According to a flexible piston Stirling generator provided by the present invention, a flow channel is arranged inside the second support member, the outlet and the inlet of the flow channel are respectively arranged on the outer peripheral surface of the second support member and the first end of the second support member, a through hole connected to the flow channel is arranged at the center of the second end surface, and the inflation valve is arranged in the through hole.

[0015] According to a flexible piston Stirling generator provided by the present invention, the power generation component includes a stator component fixed to the inner wall of the shell, the stator component contains an excitation winding or a permanent magnet for generating a magnetic field; a coil is wound around the power piston, and the power piston is located in the magnetic field generated by the stator assembly.

[0016] According to a flexible piston Stirling generator provided by the present invention, the power piston includes a support frame, an elastic diaphragm, a power piston movable part and a power piston support rod, the support frame is fixedly connected to the stator assembly; the elastic diaphragm is connected to one end of the support frame facing the gas distribution piston, and the compression chamber is formed between the elastic diaphragm and the gas distribution piston; a coil is wound around the power piston movable part, which is suitable for reciprocating and cutting magnetic lines of force in the magnetic field generated by the power generation assembly; one end of the power piston support rod is connected to the center of the elastic diaphragm, and the other end is connected to the power piston movable part.

[0017] According to a flexible piston Stirling generator provided by the present invention, the power piston movable part is a cover-like structure, including a horizontal top and a vertical side connected to the edge of the horizontal top.

[0018] The back pressure cavity is formed between the horizontal top and the inner wall of the second end of the shell. A through hole connected to the back pressure cavity is arranged on the horizontal top. The center of one side of the horizontal top facing away from the back pressure cavity is connected to the power piston support rod.

[0019] The vertical side portion is located in the magnetic field generated by the stator assembly of the power generation assembly and a coil is wound around the outer circumference of the vertical side portion.

[0020] The flexible piston Stirling generator provided by the present invention comprises a gas distribution piston including a shell and a first end face and a second end face connected to both ends of the shell, the first end face and the second end face are both flexible end faces, suitable for undergoing a certain elastic deformation under the action of pressure, and there is an area difference between the first end face and the second end face. The present invention does not use a traditional gas distribution piston rod, and by fixing the gas distribution piston in the shell, the pressure of the gas working medium in the expansion chamber and the compression chamber is repeatedly changed, so that the first end face and the second end face of the gas distribution piston undergo a certain elastic deformation, which prompts the power piston to reciprocate, and converts the reciprocating mechanical energy of the power piston into electrical energy output through the power generation component. The flexible piston Stirling generator provided by the present invention can reduce the friction between the gas distribution piston and the inner wall of the cylinder and the friction between the gas distribution piston rod, reduce friction loss, increase the operating frequency of the generator, and improve the power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the flexible piston Stirling generator provided by the present invention.

[0023] Figure 2 The figure is a schematic diagram of the assembly structure of the gas distribution piston and the heat regenerator provided by the present invention.

[0024] Figure 3 yes Figure 2 Enlarged view of part A.

[0025] Figure 4 It is a structural schematic diagram of the power piston provided by the present invention.

[0026] Figure numerals: 1. shell; 2. gas distribution piston; 21. outer shell; 211. first outer shell; 212. second outer shell; 22. first end face; 23. second end face; 24. gas distribution piston support rod; 241. first support member; 242. second support member; 25. inflation valve; 3. expansion chamber; 4. power piston; 41. support frame; 42. elastic diaphragm; 43. power piston movable part; 431. horizontal top; 432. vertical side; 44. power piston support rod; 5. compression chamber; 6. back pressure chamber; 7. power generation component; 8. heat exchange component; 81. heater; 82. regenerator; 821. inner ring wall of regenerator; 822. wire mesh; 83. cooler. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0032] Combine the following Figures 1 to 4 The specific structure and working process of the flexible piston Stirling generator of the present invention are described.

[0033] One embodiment of the present invention provides a flexible piston Stirling generator, see Figure 1 As shown, the flexible piston Stirling generator includes a shell 1, a gas distribution piston 2, a power piston 4, a power generation component 7 and a heat exchange component 8. The gas distribution piston 2 is fixed inside the shell 1. The gas distribution piston 2 includes an outer shell 21 and a first end face 22 and a second end face 23 connected at both ends of the outer shell 21. The first end face 22 and the second end face 23 are both flexible end faces, suitable for elastic deformation under pressure, and there is an area difference between the first end face 22 and the second end face 23; an expansion chamber 3 is formed between the gas distribution piston 2 and the first end inner wall of the shell 1; the power piston 4 is arranged inside the shell 1, a compression chamber 5 is formed between the power piston 4 and the gas distribution piston 2, and a back pressure chamber 6 is formed between the power piston 4 and the second end inner wall of the shell 1; the power generation component 7 is connected to the power piston 4, and is suitable for converting the mechanical energy of the power piston 4 into electrical energy output; the heat exchange component 8 is arranged inside the shell 1, and the heat exchange component 8 includes a heater 81, a heat regenerator 82 and a cooler 83 connected in sequence, the heater 81 is connected to the expansion chamber 3, and the cooler 83 is connected to the compression chamber 5.

[0034] It can be understood that in the flexible piston Stirling generator of this embodiment, in the initial state, the expansion chamber 3 is filled with low-temperature gaseous working fluid, and the compression chamber 5 is filled with high-temperature gaseous working fluid. In the ideal cycle of power generation, the four processes of isochoric heat release, isothermal compression, isochoric heat absorption, and isothermal expansion are continuously repeated (these processes are four specific processes of the Stirling generator, which will not be described in detail here). By continuously repeating the above four stages, the pressure of the gas working fluid in the expansion chamber 3 and the compression chamber 5 changes. The change in the pressure of the gas working fluid in the expansion chamber 3 and the compression chamber 5 will cause a certain elastic deformation of the first end face 22 and the second end face 23 of the gas distribution piston 2, prompting the power piston 4 to reciprocate, and the reciprocating mechanical energy of the power piston 4 is converted into electrical energy output through the power generation component 7 to complete the power generation process.

[0035] In the flexible piston Stirling generator of this embodiment, the gas distribution piston 2 is fixedly arranged, and the traditional gas distribution piston rod is not used. Only through the change of the gas working medium pressure in the expansion chamber 3 and the compression chamber 5, the flexible first end face 22 and the second end face 23 are elastically deformed, and under the cooperation with the power piston 4 and the gas working medium circulation, the generator continuously generates electrical energy. The use of the above-mentioned flexible piston end face can reduce the friction between the gas distribution piston and the inner wall of the cylinder and the friction between the gas distribution piston rod, reduce friction loss, increase the working frequency of the generator, and improve the power generation efficiency.

[0036] In some embodiments of the flexible piston Stirling generator of the present invention, the regenerator 82 includes an inner ring wall 821 of the regenerator and a wire mesh 822 arranged on the outer peripheral surface of the inner ring wall 821 of the regenerator, and the wire mesh 822 is used to absorb and release heat during the circulation of the gas working medium. The inner ring wall 821 of the regenerator is fixedly installed on the shell 1, and the gas piston 2 is fixed on the inner wall surface of the inner ring wall 821 of the regenerator. An expansion chamber 3 is formed between the first end face 22 and the inner wall of the first end of the shell 1. The heater 81 is fixedly installed on the expansion chamber 3 for heating the gas working medium in the expansion chamber 3. A compression chamber 5 is formed between the second end face 23 and the power piston 4. The cooler 83 is connected to the end of the inner ring wall 821 of the regenerator for cooling the gas working medium in the compression chamber 5.

[0037] It can be understood that the heater 81, the regenerator 82 and the cooler 83 are connected in sequence to form the heat exchange assembly 8. The heater 81, the regenerator 82 and the cooler 83 all have flow channels for gas working medium circulation. The heater 81 is used to heat the gas working medium in the expansion chamber 3, and the cooler 83 is used to cool the gas working medium in the compression chamber 5. The wire mesh 822 absorbs heat from the hot working medium flowing through the regenerator 82 during the gas circulation process, and when the cold working medium flows through the regenerator 82, the absorbed heat is exchanged with the cold working medium to achieve heating. Compared with the traditional gas working medium circulating in the cylinder, the structure of this embodiment can reduce the shuttle heat loss, working medium leakage loss, etc., and improve the working frequency of the generator.

[0038] In some embodiments of the flexible piston Stirling generator of the present invention, see Figure 2 As shown, the gas distribution piston 2 includes a first piston part, a second piston part and a gas distribution piston support rod 24. The first piston part includes a first shell 211 and a first end face 22. The first shell 211 is fixed to the inner wall of the inner ring wall 821 of the heat regenerator, and the edge of the first end face 22 is fixedly connected to the first end of the first shell 211. The second piston part includes a second shell 212 and a second end face 23. The second shell 212 is fixed to the inner wall of the inner ring wall 821 of the heat regenerator, and the edge of the second end face 23 is fixedly connected to the first end of the second shell 212. The second end of the second shell 212 is connected to the second end of the first shell 211. The gas distribution piston support rod 24 includes a first support member 241 and a second support member 242. The first end of the first support member 241 is connected to the center of the first end face 22, the first end of the second support member 242 is connected to the center of the second end face 23, and the second end of the first support member 241 is connected to the second end of the second support member 242 by internal and external thread assembly.

[0039] During assembly, firstly, the first shell 211, the first end face 22 and the first support member 241 are welded to form the first piston part, and the second shell 212, the second end face 23 and the second support member 242 are welded to form the second piston part. The welded second piston part is inserted and fixed on the inner wall of the inner ring wall 821 of the regenerator from one end, and then the welded first piston part is inserted and fixed on the inner wall of the inner ring wall 821 of the regenerator from the other end, and the second end of the first support member 241 and the second end of the second support member 242 are assembled and connected by internal and external threads. The connection between the first piston part and the second piston part is also filled with solder for brazing to form a whole. The contact between the first end face 22 of the first piston part and the inner wall of the inner ring wall 821 of the regenerator is also fixed by welding.

[0040] The heater 81 and the shell 1 are fixed by welding, and then the assembly of the gas distribution piston 2 and the inner ring wall 821 of the regenerator is placed in the shell 1, and then the wire mesh 822 is placed therein. The outer shell 21 of the gas distribution piston 2 is provided with an air filling valve 25 for filling the inside of the gas distribution piston 2 to balance the internal and external pressure difference during operation. Figure 2 and Figure 3 As shown, a flow passage is provided inside the second support member 242, a through hole communicating with the flow passage is provided at the center of the second end surface 23, and a charging valve 25 is provided in the through hole. In the initial stage of assembling the flexible piston Stirling generator, air is charged into the gas distribution piston 2 through the charging valve 25, so that in the initial state, the internal air pressure of the gas distribution piston 2 maintains pressure balance with the external expansion chamber 3 and compression chamber 5.

[0041] In some specific examples, the first shell 211 is a variable diameter shell, and the second shell 212 is a full diameter shell. The inner diameter of the first shell 211 gradually increases from the second end of the first shell 211 to the first end of the first shell 211, so that the area of ​​the first end face 22 is larger than the area of ​​the second end face 23.

[0042] The outer shell 21 structure of the gas distribution piston 2 in this example is configured such that the area of ​​the first end surface 22 is larger than the area of ​​the second end surface 23 by means of the variable diameter setting of the first outer shell 211. The force applied to the gas distribution piston 2 in the vertical direction can be expressed as (ignoring gravity): , where is the total mass of the first end face, the second end face and the support rod of the gas distribution piston, is the pressure of the working space, is the pressure inside the gas piston. is the area of ​​the first end surface of the gas distribution piston, is the area of ​​the second end surface of the gas distribution piston, is the stiffness of the first end face of the gas distribution piston, is the stiffness of the second end face of the gas distribution piston, It is the displacement of the two end faces of the gas distribution piston.

[0043] Since the area of ​​the first end face 22 and the second end face 23 of the gas distribution piston 2 is different, when the pressure of the gas working medium changes, the pressure on the two end faces of the gas distribution piston 2 will change, and elastic deformation will occur under the constraint of the inherent stiffness of the end faces. Therefore, under the cooperation between the gas distribution piston 2, the power piston 4, and the gas working medium, the generator can continuously generate electrical energy.

[0044] It can be understood that, through the structural setting of the flexible piston Stirling generator in the above embodiments and examples, especially the structural setting of the valve piston 2, the friction with the cylinder wall is reduced, and the housing 1 is no longer subject to the friction between the piston and the cylinder and the gas damping, which simplifies the stress of the housing and facilitates the vibration reduction of the generator housing 1. At the same time, since there is no valve piston rod and leaf spring in the traditional structure, the space of the back pressure chamber is reduced, the structure of the generator is more compact, and the weight of the generator is reduced.

[0045] In other embodiments of the flexible piston Stirling generator of the present invention, the power generation component 7 includes a stator component fixed to the inner wall of the shell 1, the stator component contains an excitation winding or a permanent magnet for generating a magnetic field; a coil is wound around the power piston 4, and the power piston 4 is located in the magnetic field generated by the stator assembly.

[0046] It can be understood that the power generation assembly 7 in this embodiment adopts the design of a linear motor, and realizes the conversion of mechanical energy into electrical energy through the stator assembly and the coil on the power piston 4. The coil on the power piston 4 moves in the magnetic field generated by the stator assembly, cuts the magnetic flux lines, generates electromotive force, and the generated electromotive force causes the free electrons in the coil to move, forming a current, thereby converting mechanical energy into electrical energy.

[0047] In the above embodiments, the gas distribution piston 2 is fixedly arranged, which can reduce the friction between the gas distribution piston and the inner wall of the cylinder and the friction between the gas distribution piston rod, thereby reducing friction loss. However, the power piston 4 needs to reciprocate. In some embodiments of the flexible piston Stirling generator of the present invention, see Figure 4 As shown, the power piston 4 includes a support frame 41, an elastic diaphragm 42, a power piston movable part 43 and a power piston support rod 44. The support frame 41 is fixedly connected to the stator assembly; the elastic diaphragm 42 is connected to one end of the support frame 41 facing the gas distribution piston 2, and a compression chamber 5 is formed between the elastic diaphragm 42 and the gas distribution piston 2; a coil is wound around the power piston movable part 43, which is suitable for reciprocating in the magnetic field generated by the power generation component 7 to cut the magnetic flux lines; one end of the power piston support rod 44 is connected to the center of the elastic diaphragm 42, and the other end is connected to the power piston movable part 43.

[0048] It can be understood that the structure of the power piston 4 in the present embodiment makes the power piston 4 also relatively fixed, that is, the support frame 41, the elastic diaphragm 42 and the power piston support rod 44 are all fixed, and the power piston movable part 43 only needs to complete the reciprocating motion in the magnetic field generated by the power generation component 7 to cut the magnetic flux lines. During the power generation process of the flexible piston Stirling generator, the change in the pressure of the gas working fluid in the compression chamber 5 drives the elastic diaphragm 42 of the power piston 4 to vibrate. Based on the vibration of the elastic diaphragm 42, the power piston support rod 44 drives the power piston movable part 43 to reciprocate. With the cooperation of the power generation component 7, the coil on the power piston movable part 43 cuts the magnetic flux lines and outputs electrical energy. In this process, the power piston 4 also achieves no friction with the cylinder wall, reduces friction loss, increases the operating frequency of the generator, and improves the power generation efficiency.

[0049] In some specific examples, the power piston movable part 43 is a cover-like structure, including a horizontal top 431 and a vertical side 432 connected to the edge of the horizontal top 431. A back pressure chamber 6 is formed between the horizontal top 431 and the inner wall of the second end of the shell 1. A through hole connected to the back pressure chamber 6 is provided on the horizontal top 431. The center of one side of the horizontal top 431 facing away from the back pressure chamber 6 is connected to the power piston support rod 44. The vertical side 432 is located in the magnetic field generated by the stator assembly of the power generation assembly 7 and a coil is wound around the outer periphery of the vertical side 432.

[0050] A coil is wound around the outer periphery of the vertical side 432, and the horizontal top 431 is welded to the power piston support rod 44. The other end of the power piston support rod 44 is combined with the elastic diaphragm 42 by welding. Among them, a through hole connected to the back pressure chamber 6 is set on the horizontal top 431, which can be used to connect the inside of the power piston 4 cavity with the back pressure chamber 6 to balance the internal and external pressure differences. The support frame 41 is also fixed to the inner wall of the stator assembly of the power generation assembly 7 by welding. After completing the above work, refer to Figure 1 As shown, the housing 1 is divided into an upper half and a lower half, wherein the gas piston 2, the heater 81, the inner ring wall 821 of the regenerator and the wire mesh 822 are installed in the lower half of the housing 1. After the power piston 4 and the power generation assembly 7 are assembled, the assembled power piston 4 and the power generation assembly 7 are fixed together with the cooler 83 by screws, and finally the upper half of the housing 1 is installed to ensure that the entire internal space of the housing 1 is in a closed environment. Since the gas piston 2 and the power piston 4 are both fixedly installed, the flexible first end face 22 and the second end face 23 and the elastic diaphragm 42 are used to promote the movement of the gas working medium in the expansion chamber 3 and the compression chamber 5, reducing the friction between the gas piston 2 and the power piston 4 and the cylinder wall, and the housing 1 is no longer subject to the friction between the piston and the cylinder and the gas damping, which simplifies the force condition of the housing 1 and facilitates the vibration reduction of the generator housing.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible piston Stirling generator, characterized in that: include: Housing (1); A gas distribution piston (2) is fixed inside the housing (1), the gas distribution piston (2) comprising a housing (21) and a first end surface (22) and a second end surface (23) connected to two ends of the housing (21), the first end surface (22) and the second end surface (23) being both flexible end surfaces, suitable for elastic deformation under pressure, and having an area difference between the first end surface (22) and the second end surface (23); an expansion chamber (3) is formed between the gas distribution piston (2) and the inner wall of the first end of the housing (1); A power piston (4) is arranged inside the housing (1), a compression chamber (5) is formed between the power piston (4) and the gas distribution piston (2), and a back pressure chamber (6) is formed between the power piston (4) and the inner wall of the second end of the housing (1); A power generation assembly (7), connected to the power piston (4), and adapted to convert mechanical energy of the power piston (4) into electrical energy output; A heat exchange component (8) is arranged inside the shell (1), and comprises a heater (81), a heat regenerator (82), and a cooler (83) which are connected in sequence, wherein the heater (81) is connected to the expansion chamber (3), and the cooler (83) is connected to the compression chamber (5).

2. The flexible piston Stirling generator according to claim 1, characterized in that: The regenerator (82) comprises a regenerator inner ring wall (821) and a wire mesh (822) arranged on the outer peripheral surface of the regenerator inner ring wall (821); the regenerator inner ring wall (821) is fixedly mounted on the shell (1); the gas distribution piston (2) is fixedly mounted on the inner wall of the regenerator inner ring wall (821); the expansion chamber (3) is formed between the first end surface (22) and the first end inner wall of the shell (1); the heater (81) is fixedly mounted on the expansion chamber (3) and is used to heat the gas working medium in the expansion chamber (3); the compression chamber (5) is formed between the second end surface (23) and the power piston (4); the cooler (83) is connected to the end of the regenerator inner ring wall (821) and is used to cool the gas working medium in the compression chamber (5).

3. The flexible piston Stirling generator according to claim 2, characterized in that: The gas distribution piston (2) comprises: The first piston portion comprises a first outer shell (211) and the first end surface (22), the first outer shell (211) being fixed to the inner wall of the inner ring wall (821) of the regenerator, and the edge of the first end surface (22) being fixedly connected to the first end of the first outer shell (211); The second piston portion comprises a second outer shell (212) and the second end surface (23), the second outer shell (212) being fixed to the inner wall of the inner ring wall (821) of the regenerator, the edge of the second end surface (23) being fixedly connected to the first end of the second outer shell (212), and the second end of the second outer shell (212) being connected to the second end of the first outer shell (211); A gas distribution piston support rod (24), wherein one end of the gas distribution piston support rod (24) is connected to the first end surface (22), and the other end of the gas distribution piston support rod (24) is connected to the second end surface (23).

4. The flexible piston Stirling generator according to claim 3, characterized in that: The gas distribution piston (2) further comprises an air charging valve (25), wherein the air charging valve (25) is arranged on the housing (21), and the air charging valve (25) is used to charge air into the interior of the gas distribution piston (2) to balance the pressure difference between the inside and the outside.

5. The flexible piston Stirling generator according to claim 4, characterized in that: The first shell (211) is a variable diameter shell, and the second shell (212) is a full diameter shell. The inner diameter of the first shell (211) gradually increases from the second end of the first shell (211) to the first end of the first shell (211), so that the area of ​​the first end surface (22) is larger than the area of ​​the second end surface (23).

6. The flexible piston Stirling generator according to claim 5, characterized in that: The valve piston support rod (24) comprises a first support member (241) and a second support member (242), wherein the first end of the first support member (241) is connected to the center of the first end surface (22), the first end of the second support member (242) is connected to the center of the second end surface (23), and the second end of the first support member (241) is connected to the second end of the second support member (242) by internal and external threaded assembly.

7. The flexible piston Stirling generator according to claim 6, characterized in that: A flow channel is provided inside the second support member (242); an outlet and an inlet of the flow channel are respectively provided on the outer peripheral surface of the second support member (242) and the first end of the second support member (242); a through hole communicating with the flow channel is provided at the center of the second end surface (23); and the inflation valve (25) is provided in the through hole.

8. The flexible piston Stirling generator according to any one of claims 1 to 7, characterized in that: The power generation component (7) comprises a stator component fixed to the inner wall of the housing (1), the stator component comprising an excitation winding or a permanent magnet for generating a magnetic field; a coil is wound around the power piston (4), and the power piston (4) is located in the magnetic field generated by the stator component.

9. The flexible piston Stirling generator according to claim 8, characterized in that: The power piston (4) comprises: A support frame (41) fixedly connected to the stator assembly; An elastic diaphragm (42) connected to one end of the support frame (41) facing the gas distribution piston (2), the compression chamber (5) being formed between the elastic diaphragm (42) and the gas distribution piston (2); A power piston movable part (43), the power piston movable part (43) being wound with a coil and being suitable for reciprocating in the magnetic field generated by the power generation component (7) to cut magnetic flux lines; A power piston support rod (44) has one end connected to the center of the elastic diaphragm (42) and the other end connected to the power piston movable part (43).

10. The flexible piston Stirling generator according to claim 9, characterized in that: The power piston movable part (43) is a cover-shaped structure, comprising a horizontal top (431) and a vertical side (432) connected to the edge of the horizontal top (431); The back pressure chamber (6) is formed between the horizontal top (431) and the inner wall of the second end of the shell (1); a through hole communicating with the back pressure chamber (6) is provided on the horizontal top (431); and the center of a side of the horizontal top (431) facing away from the back pressure chamber (6) is connected to the power piston support rod (44); The vertical side portion (432) is located in the magnetic field generated by the stator assembly of the power generation assembly (7), and a coil is wound around the outer circumference of the vertical side portion (432).

Images