Flexible piston Stirling generator
The flexible piston structure of the Stirling generator utilizes the pressure of the gas working fluid to drive the movement of the power piston, thus solving the problem of friction loss and improving power generation efficiency.
Patent Information
- Application Number
- CN202422980251.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-04
AI Technical Summary
The free piston Stirling generator suffers from reduced power generation efficiency due to frictional losses during the power generation process.
The system employs a flexible piston structure, where the end face of the gas distribution piston undergoes elastic deformation under pressure, eliminating the need for a traditional gas distribution piston rod. The movement of the power piston is driven by changes in the working gas pressure, and mechanical energy is converted into electrical energy through a power generation component.
This reduces frictional losses between the valve train piston and the cylinder wall, as well as the valve train piston rod, thereby increasing the generator's operating frequency and power generation efficiency.
Smart Images
Figure CN223447142U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to stirling generator technical field especially relates to a kind of flexible piston stirling generator. BACKGROUND
[0002] Stirling generator is a closed cycle external combustion generator, the working process of Stirling generator is through the reciprocating flow of gas working substance between expansion chamber and compression chamber, and is heated in expansion chamber by external heat source, is cooled in compression chamber by external cold source, the gas pressure change generated is used to drive piston movement to output mechanical energy to the outside, and then it is converted into electric energy by power generation device.
[0003] Free piston Stirling generator is a typical Stirling generator, free piston Stirling generator cancels the moving parts for connecting gas distribution piston and power piston, gas distribution piston reciprocates in balanced position to realize phase modulation, gas distribution piston and power piston are matched through the transmission of gas pressure, and finally realize the reciprocating motion of power piston to output mechanical energy and convert into electric energy.
[0004] In the structure of free piston generator, gas distribution piston and power piston will produce friction with the inner wall of cylinder during reciprocating motion, and friction will also occur between gas distribution piston rod and power piston, causing friction loss, reducing the working frequency of generator and affecting the power generation efficiency. UTILITY MODEL CONTENTS
[0005] The utility model provides a kind of flexible piston stirling generator to solve the defect that free piston Stirling generator is prone to loss due to friction during power generation in prior art.
[0006] The utility model provides a kind of flexible piston stirling generator, including shell, gas distribution piston, power piston, power generation subassembly and heat exchange subassembly, the gas distribution piston is fixed in the inside of the shell, the gas distribution piston includes shell and the first end face and the second end face connected in the both ends of the shell, the first end face and the second end face are flexible end face, it is suitable to be elastically deformed under the action of pressure, there is area difference between the first end face and the second end face;Expansion chamber is formed between the gas distribution piston and the first end inner wall of shell;The power piston is set in the inside of the shell, compression chamber is formed between the power piston and the gas distribution piston, back pressure chamber is formed between the power piston and the second end inner wall of shell;The power generation subassembly is connected the power piston, it is suitable that the mechanical energy of the power piston is converted into electric energy output;The heat exchange subassembly is set in the inside of the shell, the heat exchange subassembly includes in proper order heater, regenerator and cooler, the heater is communicated with the expansion chamber, and the cooler is communicated with the compression chamber.
[0007] According to the flexible piston Stirling generator, the regenerator comprises a regenerator inner ring wall and a wire screen arranged on the outer circumferential surface of the regenerator inner ring wall, the regenerator inner ring wall is fixedly installed on the shell, the gas distribution piston is fixed on the inner wall of the regenerator inner ring wall, the expansion cavity is formed between the first end surface and the first end inner wall of the shell, the heater is fixedly installed on the expansion cavity and used for heating the gas working medium in the expansion cavity, the cooling device is connected to the end portion of the regenerator inner ring wall and used for cooling the gas working medium in the compression cavity.
[0008] According to the flexible piston Stirling generator, the gas distribution piston comprises a first piston part, a second piston part and a gas distribution piston support rod, the first piston part comprises a first shell and the first end surface, the first shell is fixed on the inner wall of the regenerator inner ring wall, and the first end surface edge is fixedly connected to the first end of the first shell.
[0009] The second piston part comprises a second shell and the second end surface, the second shell is fixed on the inner wall of the regenerator inner ring wall, the second end surface edge is fixedly connected to the first end of the second shell, and the second end of the second shell is connected with the second end of the first shell.
[0010] One end of the gas distribution piston support rod is connected with the first end surface, and the other end of the gas distribution piston support rod is connected with the second end surface.
[0011] According to the flexible piston Stirling generator, the gas distribution piston further comprises an inflation valve, the inflation valve is arranged on the shell, and the inflation valve is used for inflating the interior of the gas distribution piston to balance the internal and external pressure difference.
[0012] According to the flexible piston Stirling generator, the first shell is a variable-diameter shell, the second shell is a through-diameter shell, the inner diameter of the first shell gradually increases along the direction from the second end of the first shell to the first end of the first shell, and the area of the first end surface is greater than the area of the second end surface.
[0013] According to the flexible piston Stirling generator, the gas distribution piston support rod comprises a first support piece and a second support piece, the first end of the first support piece is connected with the center of the first end surface, the first end of the second support piece is connected with the center of the second end surface, and the second end of the first support piece and the second end of the second support piece are connected through internal and external thread assembly.
[0014] The utility model provides a kind of flexible piston stirling generator, second support piece inside is provided with overflow passage, the outlet and the inlet of overflow passage are respectively arranged on the outer peripheral surface of second support piece and the first end of second support piece, the second end surface center is provided with the through-hole being communicated with overflow passage, the inflation valve is arranged in the through-hole.
[0015] According to the utility model provides a kind of flexible piston stirling generator, the power piston includes the stator assembly fixed in the inner wall of the shell, the stator assembly contains excitation winding or permanent magnet, for generating magnetic field;Coil is wound on the power piston, the power piston is located in the magnetic field generated by the stator assembly.
[0016] According to the utility model provides a kind of flexible piston stirling generator, the power piston includes support frame, elastic diaphragm, power piston movable part and power piston support rod, the support frame is fixedly connected to the stator assembly;The elastic diaphragm is connected to the one end of support frame towards the valve piston, and the elastic diaphragm and the valve piston form the compression cavity;Coil is wound on the power piston movable part, suitable for reciprocating motion cutting magnetic induction line in the magnetic field generated by the power generation assembly;The power piston support rod one end is connected to the center of elastic diaphragm, and the other end is connected to the power piston movable part.
[0017] According to the utility model provides a kind of flexible piston stirling generator, the power piston movable part is cover-like structure, including horizontal top and vertical side portion being connected in the rim of horizontal top.
[0018] The horizontal top and the second end inner wall of the shell form the back pressure cavity, the horizontal top is provided with through hole being communicated with the back pressure cavity, and the horizontal top center is connected to the power piston support rod on the side of the back pressure cavity.
[0019] The vertical side portion is located in the magnetic field generated by the stator assembly of the power generation assembly and is wound with coil on the outer periphery of vertical side portion.
[0020] The utility model provides a flexible piston stirling generator, wherein the gas distribution piston includes the shell and the first end face and the second end face connected at the both ends of the shell, the first end face and the second end face are flexible end face, are suitable for under the pressure effect certain elastic deformation, the first end face and the second end face exist area difference. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0022] Figure 1 It is the structure schematic diagram of the flexible piston stirling generator provided by the utility model.
[0023] Figure 2 It is the assembly structure schematic diagram of the gas distribution piston and regenerator provided by the utility model.
[0024] Figure 3 It is Figure 2 The enlarged view of A of
[0025] Figure 4 It is the structure schematic diagram of the power piston provided by the utility model.
[0026] Reference signs: 1, shell;2, gas distribution piston;21, shell;211, first shell;212, second shell;22, first end face;23, second end face;24, gas distribution piston support rod;241, first support;242, second support;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 assembly;8, heat exchange assembly;81, heater;82, regenerator;821, regenerator inner ring wall;822, wire mesh;83, cooler. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the utility model will be described clearly and completely in combination with the drawings in the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.
[0028] In the description of the embodiments of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown based on the drawings, and is only for the convenience of describing the embodiments of the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0029] In the description of the embodiments of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For the ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.
[0030] In the embodiments of the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be 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 "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.
[0031] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.
[0032] The specific structure and working process of the flexible piston Stirling generator of the present application will be described below. Figures 1 to 4 The specific structure and working process of the flexible piston Stirling generator of the present application will be described below.
[0033] One embodiment of the present application provides a flexible piston Stirling generator, referring to Figure 1 The flexible piston Stirling generator includes a housing 1, a gas distribution piston 2, a power piston 4, a power assembly 7 and a heat exchange assembly 8. The gas distribution piston 2 is fixed inside the housing 1. The gas distribution piston 2 includes an outer shell 21 and a first end face 22 and a second end face 23 connected to 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. The first end face 22 and the second end face 23 have an area difference. The gas distribution piston 2 and the first end inner wall of the housing 1 form an expansion chamber 3. The power piston 4 is arranged inside the housing 1. The power piston 4 and the gas distribution piston 2 form a compression chamber 5. The power piston 4 and the second end inner wall of the housing 1 form a back pressure chamber 6. The power assembly 7 is connected to the power piston 4, suitable for converting the mechanical energy of the power piston 4 into electrical energy output. The heat exchange assembly 8 is arranged inside the housing 1. The heat exchange assembly 8 includes a heater 81, a regenerator 82 and a cooler 83 connected in sequence. The heater 81 is communicated with the expansion chamber 3. The cooler 83 is communicated with the compression chamber 5.
[0034] It can be understood that, in the initial state, the flexible piston Stirling generator of the embodiment is filled with low-temperature gas working medium in the expansion chamber 3 and high-temperature gas working medium in the compression chamber 5, and the four processes of constant volume heat release, isothermal compression, constant volume heat absorption and isothermal expansion are repeated in the ideal cycle process of power generation. Through the continuous circulation and repetition of the above four stages, the pressure of the gas working medium in the expansion chamber 3 and the compression chamber 5 changes, which causes the first end face 22 and the second end face 23 of the distribution piston 2 to elastically deform, so as to promote the reciprocating movement of the power piston 4. The reciprocating movement of the power piston 4 is converted into electrical energy by the power generation assembly 7, and the power generation process is completed.
[0035] The flexible piston Stirling generator of the embodiment is fixedly provided with the distribution piston 2 and does not use a traditional distribution piston rod. The flexible first end face 22 and the second end face 23 elastically deform through the change of the pressure of the gas working medium in the expansion chamber 3 and the compression chamber 5, and the generator continuously generates electrical energy under the cooperation of the power piston 4 and the gas working medium circulation. The flexible piston end face can reduce the friction between the distribution piston and the inner wall of the cylinder and the friction between the distribution piston rod, reduce the friction loss, improve the working frequency of the generator and improve the power generation efficiency.
[0036] In some embodiments of the flexible piston Stirling generator, the regenerator 82 includes a regenerator inner ring wall 821 and a wire mesh 822 arranged on the outer circumferential surface of the regenerator inner ring wall 821. The wire mesh 822 is used for heat absorption and release during the circulation of the gas working medium. The regenerator inner ring wall 821 is fixedly installed on the shell 1, the distribution piston 2 is fixedly arranged on the inner wall surface of the regenerator inner ring wall 821, the first end face 22 and the first end inner wall of the shell 1 form the expansion chamber 3, the heater 81 is fixedly installed on the expansion chamber 3 and is used for heating the gas working medium in the expansion chamber 3, the second end face 23 and the power piston 4 form the compression chamber 5, and the cooler 83 is connected to the end portion of the regenerator inner ring wall 821 and is used 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 sequentially connected to form the heat exchange assembly 8, the heater 81, the regenerator 82 and the cooler 83 all have flow channels for the circulation of the gas working medium, the heater 81 is used for heating the gas working medium in the expansion chamber 3, the cooler 83 is used for cooling the gas working medium in the compression chamber 5, the wire screen 822 absorbs heat from the hot working medium flowing through the regenerator 82 during the circulation of the gas, and the absorbed heat is exchanged to the cold working medium to heat the cold working medium when the cold working medium flows through the regenerator 82. Compared with the traditional in-cylinder circulating gas working medium, the structure of the embodiment can reduce the shuttle heat loss, the working medium leakage loss and the like, and improve the working frequency of the generator.
[0038] In some embodiments of the flexible piston Stirling generator, as shown in Figure 2 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 regenerator, and 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 regenerator, and 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 241 and a second support 242. The first end of the first support 241 is connected to the center of the first end face 22, and the first end of the second support 242 is connected to the center of the second end face 23. The second end of the first support 241 is connected to the second end of the second support 242 through internal and external thread assembly.
[0039] During assembly, first, the first shell 211, the first end face 22 and the first support 241 are welded into the first piston part, the second shell 212, the second end face 23 and the second support 242 are welded into the second piston part, the welded second piston part is assembled into the regenerator from one end of the inner ring wall 821 of the regenerator and is fixed to the inner wall of the inner ring wall 821 of the regenerator, then the welded first piston part is assembled into the regenerator from the other end of the inner ring wall 821 of the regenerator and is fixed to the inner wall of the inner ring wall 821 of the regenerator, and the second end of the first support 241 is connected to the second end of the second support 242 through internal and external thread assembly. The connection part of the first piston part and the second piston part is also filled with solder for brazing, so as to form an integral whole. The contact part of 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 gas distribution piston 2 and the assembly of the inner ring wall 821 of the regenerator are put into the shell 1, and then the wire mesh 822 is put into the shell 1. The gas distribution piston 2 is provided with a gas charging valve 25 on the outer shell 21, which is used to charge gas into the gas distribution piston 2 to balance the pressure difference between the inside and outside during operation. In some specific examples, in combination with the second support 242 shown in Figure 2 and Figure 3 The second support 242 is provided with a flow passage inside, and the second end surface 23 is provided with a through hole in communication with the flow passage, and the gas charging valve 25 is arranged in the through hole. In the initial stage of assembly of the flexible piston Stirling generator, the gas distribution piston 2 is charged with gas through the gas charging valve 25, so that in the initial state, the internal pressure of the gas distribution piston 2 is balanced with the internal pressure of the expansion chamber 3 and the compression chamber 5.
[0041] In some specific examples, the first outer shell 211 is a variable-diameter outer shell, and the second outer shell 212 is a constant-diameter outer shell. The inner diameter of the first outer shell 211 gradually increases from the second end to the first end of the first outer shell 211, so that the area of the first end surface 22 is greater than the area of the second end surface 23.
[0042] The structure of the outer shell 21 of the gas distribution piston 2 in the example is that the variable-diameter of the first outer shell 211 makes the area of the first end surface 22 greater than the area of the second end surface 23. The force on the gas distribution piston 2 in the vertical direction can be represented as (ignoring gravity): , wherein is the total mass of the first end surface, the second end surface and the support rod of the gas distribution piston, is the pressure of the working space, is the pressure of the internal space of the gas distribution 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 surface of the gas distribution piston, is the stiffness of the second end surface of the gas distribution piston, is the displacement of the two end surfaces of the gas distribution piston.
[0043] Because of the difference in the area of the first end surface 22 and the second end surface 23 of the gas distribution piston 2, when the pressure of the gas working medium changes, the pressure on the two end surfaces of the gas distribution piston 2 will also change, and under the constraint of the inherent stiffness of the end surface, elastic deformation occurs. Therefore, under the cooperation of the gas distribution piston 2, the power piston 4 and the gas working medium, the generator continuously generates electric energy.
[0044] It can be understood that, through the structural arrangement of the flexible piston Stirling generator in the above embodiments and examples, especially the structural arrangement of the valve piston 2, the friction with the cylinder wall is reduced, the shell 1 is no longer subjected to the friction force of the piston and the cylinder, the gas damping, the stress condition of the shell is simplified, and the vibration of the generator shell 1 is facilitated. At the same time, since the valve piston rod and the leaf spring in the traditional structure are not used, the space of the back pressure cavity is reduced, the structure of the generator is more compact, and the weight of the generator is reduced.
[0045] In some other embodiments of the flexible piston Stirling generator, the power generation assembly 7 comprises a stator assembly fixed to the inner wall of the shell 1, the stator assembly comprises an excitation winding or a permanent magnet for generating a magnetic field; the power piston 4 is wound with a coil, and the power piston 4 is located in the magnetic field generated by the stator assembly.
[0046] It can be understood that, in the present embodiment, the power generation assembly 7 adopts the design of a linear motor, and the conversion of mechanical energy to electrical energy is realized 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 induction lines, generates an electromotive force, and the free electrons in the coil move to form an electric current, thereby converting mechanical energy into electrical energy.
[0047] In the above several embodiments, the valve piston 2 is fixedly arranged, which can reduce the friction between the valve piston and the inner wall of the cylinder and the friction between the valve piston rod, and reduce the friction loss. The power piston 4 needs to reciprocate, and in some embodiments of the flexible piston Stirling generator, as shown in Figure 4 The power piston 4 comprises 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 towards the valve piston 2, and the compression cavity 5 is formed between the elastic diaphragm 42 and the valve piston 2; the power piston movable part 43 is wound with a coil, and is adapted to reciprocate in the magnetic field generated by the power generation assembly 7 to cut the magnetic induction 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 embodiment makes the power piston 4 also relatively fixedly arranged, that is, the support frame 41, the elastic diaphragm 42 and the power piston support rod 44 are fixedly arranged, and only the power piston movable part 43 needs to complete the reciprocating motion cutting magnetic induction lines in the magnetic field generated by the power generation assembly 7. During the power generation process of the flexible piston Stirling generator, the change of the pressure of the gas working medium 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. Under the cooperation of the power generation assembly 7, the coil on the power piston movable part 43 cuts the magnetic induction lines, and outputs electric energy. In this process, the power piston 4 also achieves no friction with the cylinder wall, reduces the friction loss, improves the working frequency of the generator, and improves the power generation efficiency.
[0049] In some specific examples, the power piston movable part 43 is a cover-shaped structure, including a horizontal top part 431 and a vertical side part 432 connected to the edge of the horizontal top part 431. The horizontal top part 431 and the inner wall of the second end of the shell 1 form the back pressure chamber 6, the horizontal top part 431 is provided with a through hole communicating with the back pressure chamber 6, and the center of the side of the horizontal top part 431 away from the back pressure chamber 6 is connected with the power piston support rod 44. The vertical side part 432 is located in the magnetic field generated by the stator assembly of the power generation assembly 7 and has a coil wound around the outer periphery of the vertical side part 432.
[0050] The coil is wound around the outer periphery of the vertical side part 432, the horizontal top part 431 and the power piston support rod 44 are welded together, and the other end of the power piston support rod 44 is combined with the elastic diaphragm 42 by welding. The horizontal top part 431 is provided with a through hole communicating with the back pressure chamber 6, which can be used to communicate the inside of the power piston 4 cavity and the back pressure chamber 6, and balance the internal and external pressure difference. The support frame 41 is also fixed with the inner wall of the stator assembly of the power generation assembly 7 by welding. After the above work is completed, refer to Figure 1 As shown, the shell 1 is divided into an upper half and a lower half, wherein the gas distribution piston 2, the heater 81, the inner ring wall 821 and the wire mesh 822 of the regenerator are installed in the lower half of the shell 1, and the power piston 4 and the power generation assembly 7 are assembled. 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 shell 1 is installed to ensure that the internal space of the entire shell 1 is in a closed environment. Since the gas distribution piston 2 and the power piston 4 are fixedly installed, the flexible first end face 22 and the second end face 23 and the elastic diaphragm 42 are used to realize the movement of the gas working medium in the expansion chamber 3 and the compression chamber 5, reducing the friction between the gas distribution piston 2 and the power piston 4 and the cylinder wall. The shell 1 is no longer subjected to the friction force of the piston and the cylinder, and the gas damping, so that the stress condition of the shell 1 is simplified, and the vibration of the generator shell is facilitated.
[0051] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.
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 face (22) and a second end face (23) connected to both ends of the housing (21), the first end face (22) and the second end face (23) being flexible end faces adapted to elastically deform under pressure, and 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 inner wall of the first end of the housing (1); A power piston (4) is disposed 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 the mechanical energy of the power piston (4) into electrical energy output; A heat exchange assembly (8) is arranged inside the shell (1), and the heat exchange assembly (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).
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 fixed to the inner wall of the regenerator inner ring wall (821); the expansion chamber (3) is formed between the first end face (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 face (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), wherein the first outer shell (211) is fixed to the inner wall of the inner ring wall (821) of the regenerator, and the edge of the first end surface (22) is fixedly connected to the first end of the first outer shell (211); The second piston portion comprises a second outer shell (212) and a second end surface (23), wherein the second outer shell (212) is fixed to the inner wall of the inner ring wall (821) of the regenerator, an edge of the second end surface (23) is fixedly connected to the first end of the second outer shell (212), and the second end of the second outer shell (212) is connected to the second end of the first outer shell (211); A gas distribution piston support rod (24), one end of the gas distribution piston support rod (24) is connected to the first end surface (22), and the other end 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 filling valve (25), which is arranged on the housing (21). The air filling valve (25) is used to fill the interior of the gas distribution piston (2) with air to balance the internal and external pressure differences.
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) includes 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) and the second end of the second support member (242) are assembled and connected by internal and external threads.
7. The flexible piston Stirling generator according to claim 6, characterized in that: A flow channel is provided inside the second support member (242), and 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 assembly (7) includes a stator assembly fixed to the inner wall of the housing (1), the stator assembly including 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.
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) is connected to one end of the support frame (41) facing the gas distribution piston (2), and the compression chamber (5) is formed between the elastic diaphragm (42) and the gas distribution piston (2); A power piston movable part (43), wherein a coil is wound around the power piston movable part (43), and is suitable for reciprocating in the magnetic field generated by the power generation component (7) to cut the 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 member (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), and a through hole communicating with the back pressure chamber (6) is provided on the horizontal top (431). The center of the 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 periphery of the vertical side portion (432).