Loop double-acting Stirling heat engine reverse circulation system and operation method thereof

Abstract

The invention relates to the technical field of Stirling heat engines, and provides a loop double-acting Stirling heat engine reverse circulation system and an operation method thereof.The loop double-acting Stirling heat engine reverse circulation system comprises n Stirling heat pumps / refrigerators which are connected end to end to form a loop; the electric driving device drives main pistons in the Stirling heat pumps / refrigerators to do reciprocating motion through main piston connecting rods, the system can change the phases of the pistons by adjusting the flow direction of driving current, then the acoustic power flow direction in the system is changed, and switching of the refrigerating function and the heat pumping function is achieved according to different use scenes; the piston phase of the last stage of Stirling heat pump is adjusted to fall behind the next stage of piston phase alpha, so that the heat supply side of the heat pump can be far away from the electric driving structure; in a refrigeration state, the phase of the previous-stage piston is adjusted to be ahead of the phase alpha of the next piston, and the electric driving device can be located on the room temperature side; the cold and hot head of the system can be flexibly adjusted, the electric driving device always works in a room temperature environment, and the reliability of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of Stirling engines, and particularly to a loop double-acting Stirling engine reverse cycle system and an operation method thereof. Background Art

[0002] Stirling heat pumps / refrigerators operate based on the reverse Stirling cycle, and the core units include hot and cold end heat exchangers and a regenerator. The traditional Stirling cycle consists of two isothermal processes and two isochoric processes, and the system consumes acoustic work to obtain the required heat or cold.

[0003] In the prior art, there is a single-acting Stirling heat pump / refrigerator. "Single-acting" means that the cycle loop of the heat engine and two reciprocating pistons form a heat-work conversion combination that can work independently, and there is only this one combination in the system. In this system, driven by the main piston, the Stirling heat pump / refrigerator system receives acoustic work, generates a temperature gradient in the regenerator, and produces a heat pumping / refrigeration effect.

[0004] In addition, the double-acting Stirling heat pump / refrigerator in the prior art forms a loop by connecting three or more Stirling heat pumps end to end. The Stirling core units between adjacent pistons and the corresponding cavities and connecting pipes are sequentially connected to form a loop. "Double-acting" means that each heat pump unit has and only has one moving piston, and one side of the piston acts as a compressor, while the other side acts as an expander.

[0005] However, the structure of the existing single-acting Stirling engine determines that the hot end is often located on the compressor side. At the same time, the operation mode of the existing double-acting Stirling engine system makes its hot end heat exchanger also located on the compressor side. The compressor will be demagnetized when working at high temperature for a long time, resulting in a problem of performance degradation or even abnormal operation, which restricts the application of the free piston Stirling heat pump at higher temperatures and larger temperature spans. Summary of the Invention

[0006] The present invention provides a loop double-acting Stirling engine reverse cycle system and an operation method thereof, which are used to solve the defect that the hot end is usually located on the compressor side in the prior art, resulting in performance degradation of the compressor. By changing the direction of the input current, the phase relationship of the operation of each piston is adjusted, and the work flow direction and heat transfer direction of the Stirling heat pump / refrigerator are changed, so that the electric drive device is always in a room temperature environment.

[0007] The present invention provides a loop double-acting Stirling engine reverse cycle system, including: n Stirling heat pumps / refrigerators, and the n adjacent Stirling heat pumps / Stirling refrigerators are connected end to end through connecting pipes to form a loop; An electric drive device is connected to multiple Stirling heat pumps / Stirling refrigerators through main piston connecting rods; the electric drive device is used to drive and adjust the reciprocating motion of the main pistons in each Stirling heat pump / Stirling refrigerator, and can be switched between the heat pump state and the refrigeration state according to different usage scenarios.

[0008] According to a loop double-acting Stirling heat engine reverse cycle system provided by the present invention, the electric drive device includes multiple linear compressors, and the linear compressors are arranged corresponding to the Stirling heat pumps / Stirling refrigerators; the linear compressors adjust the reciprocating motion of the main pistons of each Stirling heat pump / Stirling refrigerator by forward current drive or reverse current drive.

[0009] According to a loop double-acting Stirling heat engine reverse cycle system provided by the present invention, the linear compressor includes: A back cavity; A mover, connected to the main piston connecting rod; An inner stator and an outer stator, both arranged in the back cavity, and the inner stator and the outer stator are respectively located inside and outside the mover; the input electric energy generates an alternating magnetic field through the inner stator and the outer stator coils, and the mover is driven by electromagnetic force under the action of the magnetic field and reciprocates along a straight line.

[0010] According to a loop double-acting Stirling heat engine reverse cycle system provided by the present invention, the electric drive device includes a crank connecting rod mechanism, and adjusts the phase relationship of the main pistons of each Stirling heat pump through the current flow direction of the crank connecting rod mechanism, and the rotational motion drives the reciprocating motion of the piston.

[0011] According to a loop double-acting Stirling heat engine reverse cycle system provided by the present invention, the crank connecting rod mechanism includes: A main journal, connected to the main piston connecting rod; A crank, arranged on the main journal; A connecting rod journal, and the adjacent main journal form a crank throw, and the crank throws are arranged in one-to-one correspondence with the main piston connecting rods; A balance weight, arranged on the crank; A flywheel, used to provide power.

[0012] According to a loop double-acting Stirling heat engine reverse cycle system provided by the present invention, the piston linear drive structure includes a swash plate structure, and the rotational motion of the swash plate structure is converted into the reciprocating motion of the main piston.

[0013] According to a loop double-acting Stirling heat engine reverse cycle system provided by the present invention, the swash plate structure includes: A main shaft, connected to the drive structure; Swash plate, which is inclined and sleeved on the outer periphery of the main shaft; Slider, which is arranged on the said plate; Slider seat, which is slidably connected with the slider, and the slider seat is connected with the main piston connecting rod.

[0014] According to a reverse cycle system of a loop double-acting Stirling heat engine provided by the present invention, the Stirling heat pump includes a room temperature heat exchanger, a regenerator and a high temperature heat exchanger arranged in sequence. A main piston is slidably arranged inside the room temperature heat exchanger, the regenerator and the high temperature heat exchanger. One end of the main piston close to the electric drive device is an expansion chamber; the end of the main piston far from the electric drive device is a compression chamber; adjacent expansion chambers are hermetically communicated through the connecting pipe.

[0015] According to a reverse cycle system of a loop double-acting Stirling heat engine provided by the present invention, 3 ≤ n ≤ 6.

[0016] The present invention also provides an operation method of a reverse cycle system of a loop double-acting Stirling heat engine, including: Driving and adjusting the reciprocating motion of the main pistons in n Stirling heat pumps / Stirling refrigerators through an electric drive device; according to different usage scenarios, by adjusting the flow direction of the input current of the electric drive device, the conversion of the acoustic power flow direction can be realized, so that the electric drive device always works in a room temperature environment; wherein, when used as a heat pump, it is necessary to adjust the piston phase of the upper-stage Stirling heat pump to lag behind the piston phase of the lower-stage Stirling heat pump by α; when used as a refrigerator, it is necessary to adjust the piston phase of the upper-stage Stirling refrigerator to lead the piston phase of the lower-stage Stirling refrigerator by α; wherein, α = 360° / n, and n is an integer greater than or equal to 3.

[0017] The reverse cycle system of a loop double-acting Stirling heat engine and its operation method provided by the present invention change the flow direction of the input current through the electric drive device, thereby changing the work flow direction and heat transfer direction in the Stirling heat pump, so that the electric drive device is always in a room temperature environment; when used as a heat pump, adjusting the phase of the upper-stage Stirling heat pump to lag behind the phase of the lower-stage Stirling heat pump by α can keep its high temperature side away from the electric drive device, thus solving the problem of high temperature limitation of the compressor in the traditional free piston Stirling heat pump. When used as a refrigerator, adjusting the phase of the upper-stage Stirling refrigerator to lead the phase of the lower-stage Stirling refrigerator by α; keeping its refrigeration end away from the electric drive device, and its piston linear drive structure is still at room temperature. Wherein, α = 360° / n, and n is an integer greater than or equal to 3.

[0018] The above loop double-acting Stirling heat engine reverse cycle system can switch the flow direction of acoustic power by adjusting the flow direction of the input current, so that the electric drive device always operates in a room temperature environment, improving the system reliability. The other end far away can operate in a low temperature state or a high temperature heat pump heating state according to needs, meeting the requirements of refrigeration and heat pump. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is one of the embodiments of the loop double-acting Stirling heat engine reverse cycle system provided by the present invention.

[0021] Figure 2 is the second embodiment of the loop double-acting Stirling heat engine reverse cycle system provided by the present invention.

[0022] Figure 3 is the third embodiment of the loop double-acting Stirling heat engine reverse cycle system provided by the present invention.

[0023] Figure 4 is the fourth embodiment of the loop double-acting Stirling heat engine reverse cycle system provided by the present invention.

[0024] Figure 5 is the fifth embodiment of the loop double-acting Stirling heat engine reverse cycle system provided by the present invention.

[0025] Figure 6 is the sixth embodiment of the loop double-acting Stirling heat engine reverse cycle system provided by the present invention.

[0026] Reference Signs: [[ID=3,3]] 100, electric drive device; 200, Stirling heat pump; 300, Stirling refrigerator; 201, room temperature heat exchanger; 202, regenerator; 203, high temperature heat exchanger (heat pump) / low temperature heat exchanger (refrigerator); 204, main piston; 205, expansion chamber; 206, compression chamber; 207, connecting pipe; 1, main piston connecting rod; 111, back cavity; 112, mover; 113, inner stator; 114, outer stator; 121, main journal; 122, crank; 123, connecting rod journal; 124, balance weight; 131, main shaft; 132, swash plate; 133, slipper; 134, slipper block. Detailed Embodiments

[0027] To make the objectives, technical solutions and advantages of the present invention more clear, the following will, in conjunction with the accompanying drawings in the present invention, clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] The following will be combined with Figures 1-6 to describe the reverse cycle system of the loop double-acting Stirling heat engine of the present invention.

[0030] As Figures 1-6 shown, the embodiments of the present invention include an electric drive device 100 and n Stirling heat pumps 200 / refrigerators 300, and the n Stirling heat pumps 200 / refrigerators 300 are connected end to end through a connecting pipe 207 to form a loop, where n is an integer greater than or equal to 3.

[0031] The electric drive device 100 and each Stirling heat pump 200 / refrigerator 300 are both connected through a main piston connecting rod 1; the electric drive device 100 is used to drive the reciprocating motion of the main pistons in each Stirling heat pump / refrigerator.

[0032] As Figure 1 、 Figure 3 and Figure 5 shown, when acting as a heat pump, by adjusting the piston phase of the upper-stage Stirling heat pump 200 where the input current flows to lag behind the piston phase of the lower-stage Stirling heat pump 200 by α, the heat supply side of the Stirling heat pump 200 can be on the side away from the piston linear drive structure 100, avoiding the problem of the electric drive device 100 failing at high temperatures. Therefore, this structure can be applied to high-temperature industrial application scenarios. As Figure 2 、 Figure 4 and Figure 6As shown, the system can also be used as a refrigerator. Adjust the piston phase of the upper - stage Stirling refrigerator 300 to lead the piston phase of the lower - stage Stirling refrigerator 300 by α, where α = 360° / n. The direction of acoustic power flow and heat transfer inside the system is reversed. At this time, the refrigeration end of the Stirling refrigerator 300 is far from the electric drive device 100, which can avoid the shrinkage of the cylinder caused by the lower temperature.

[0033] It should be noted that the sound field distribution of the Stirling heat pump 200 is determined by the number of its units. This structure can also adjust the number of units according to specific application scenarios. Generally, it should exceed three units (phase difference of 120°), and can also be four units (phase difference of 90°), five units (phase difference of 72°), six units (phase difference of 60°) or more units. However, when there are more units, the smaller piston phase difference will lead to a deterioration of the Stirling cycle performance. Therefore, the number of series - connected cylinders should not be too many.

[0034] In some feasible embodiments of the present invention, the Stirling heat pump 200 adopts a double - acting Stirling heat pump structure, including a room - temperature heat exchanger 201, a regenerator 202, and a high - temperature heat exchanger 203 arranged in sequence. A main piston 204 is slidably arranged inside the room - temperature heat exchanger 201, the regenerator 202, and the high - temperature heat exchanger 203. One end of the main piston 204 close to the electric drive device 100 is an expansion chamber 205; the end of the main piston 204 far from the electric drive device 100 is a compression chamber 206; the adjacent expansion chambers 205 are hermetically connected through a connecting pipe 207. Acoustic power sequentially passes through the main piston 204, the high - temperature heat exchanger 203, the regenerator 202, the room - temperature heat exchanger 201, and a temperature gradient is generated in the regenerator 202. Finally, heat is pumped to the environment in the high - temperature heat exchanger 203. The connecting pipe 207 connects the expansion chamber 205 of the upper - stage heat pump to the expansion chamber 205 of the lower - stage to form a loop.

[0035] Driven by the motor, the pistons and gases in the n cylinders of the entire Stirling system alternately perform cyclic motions. The n main pistons 204 alternately move up and down according to the phase difference set by the system, generating reciprocating linear motions up and down.

[0036] As Figure 1 As shown, in a feasible embodiment of the present invention, the electric drive device 100 includes a plurality of linear compressors. The linear compressors are correspondingly arranged with the Stirling heat pump 200, that is, the number of linear compressors is the same as the number of Stirling heat pumps 200. The linear compressors adjust the phase relationship of the main pistons 204 of each Stirling heat pump 200 by forward - current driving or reverse - current driving.

[0037] More specifically, each linear compressor includes a back cavity 111, a mover 112, an inner stator 113, and an outer stator 114. The mover 112 is connected to the main piston connecting rod 1 so that the main piston connecting rod 1 moves with the mover 112. Both the inner stator 113 and the outer stator 114 are disposed within the back cavity 111, and the inner stator 113 and the outer stator 114 are respectively located inside and outside the mover 112. When the system operates, a linear motor is usually used as the driving mechanism. The input electric energy generates an alternating magnetic field through the coils of the inner stator 113 and the outer stator 114. The permanent magnet on the mover 112 is driven by the electromagnetic force under the action of the magnetic field and reciprocates along the linear direction. The main piston 204 in the heat pump system is driven through the main piston connecting rod 1, converting into the acoustic work of the working medium and transmitted to the Stirling heat pump 200 system.

[0038] In addition, from the perspective of a double-acting Stirling engine, the moving parts of this structure are of the free piston type, eliminating oil lubrication and lateral friction losses, which can improve the life and reliability of the system. In addition, compared with a single-acting free piston Stirling heat pump, each heat pump unit of this structure has only one moving part, reducing the number of clearance seals and lowering the complexity of the system.

[0039] As Figure 3 shown, in some other feasible embodiments of the present invention, the electric drive device 100 includes a crank-link mechanism, and the reciprocating motion of the main piston 204 of each Stirling heat pump 200 is adjusted through the rotational motion of the crank-link mechanism.

[0040] More specifically, the crank-link mechanism includes a main journal 121, a crank 122, a connecting rod journal 123, a balance weight 124, and a flywheel. Among them, the main journal 121 is connected to the main piston connecting rod 1; the crank 122 is disposed on the main journal 121; the connecting rod journal 123 and the adjacent main journal 121 form a crank throw, and the crank throws are arranged in one-to-one correspondence with the main piston connecting rod 1, that is, the number of crank throws is the same as the number of main pistons 204; the balance weight 124 is disposed on the crank 122 to keep the entire crank-link mechanism balanced. The flywheel is used to provide power. The Stirling heat pump 200 adopts a double-acting Stirling heat pump. The through holes on the cylinders of the expansion chambers 205 of the previous Stirling heat pump 200 and the through holes on the cylinders of the expansion chambers 205 of the next Stirling heat pump 200 are hermetically connected through a connecting pipe 207 to form a loop. Taking the number of Stirling heat pumps as four as an example, when the phase of the main piston of the upper-stage heat pump is adjusted to lag behind the lower-stage unit by 90°, its high-temperature heat supply side is far from the crank-link mechanism, effectively improving its working performance and life at high temperatures; similarly, as Figure 4 shown, this system can also be used as a refrigerator. When the fixed phase difference between the pistons is maintained at 90° from left to right, the cold end of the refrigerator can be made far from the crank-link mechanism.

[0041] AsFigure 5 As shown, in some feasible embodiments of the present invention, the electric drive device 100 includes a swashplate structure. By converting the rotary motion of the swashplate structure into the reciprocating motion of the main piston, the swashplate structure can be driven to rotate by a motor, and the rotary input power is converted into the reciprocating linear motion of the main piston 204.

[0042] More specifically, the swashplate structure includes a main shaft 131, a swashplate 132, a swash rod 133, and a slipper 134. The main shaft 131 is connected to the drive structure; the swashplate 132 is sleeved obliquely on the outer periphery of the main shaft 131; the slipper 133 is arranged on the swashplate 132, the slipper seat 134 is slidably connected to the slipper 133, and the slipper seat 135 is connected to the main piston connecting rod 1. Taking the Stirling heat pump having four as an example, 4 heat pump units are evenly distributed on the circumference, and adjacent units are connected by connecting pipes to form a loop. Driven by the drive structure, the main shaft 131 and the swashplate 132 are driven to rotate, and then each main piston connecting rod 1 is driven to move linearly. By adjusting the piston phase, the piston phase of the upper-stage Stirling heat pump lags behind that of the lower-stage unit by 90°, and by changing the direction of the drive current, the swashplate structure is in the room-temperature environment. As Figure 6 shown, the system can also realize the refrigeration function. At this time, the current flow direction opposite to that of the above heat pump is adopted to make the piston of the upper-stage Stirling refrigerator lead the lower-stage unit by 90°, so that the cold-end heat exchanger is far away from the swashplate structure.

[0043] The second aspect of the embodiments of the present invention lies in providing an operation method for a reverse-cycle system of a loop double-acting Stirling heat engine, using the above reverse-cycle system of the loop double-acting Stirling heat engine, including: Driving and adjusting the reciprocating motion of the main pistons in n Stirling heat pumps / refrigerators through the electric drive device 100; realizing the switching between the refrigeration function and the heat pump function according to different usage scenarios; realizing that the electric drive device is in a room-temperature working environment by adjusting the direction of the input current of the electric drive device; wherein, when used as a heat pump, the piston phase of the upper-stage Stirling heat pump 200 can be adjusted to lag behind the piston phase of the lower-stage Stirling heat pump 200 by α, so that its room-temperature side is located on the side of the electric drive device; when used as a refrigerator, the piston phase of the upper-stage Stirling refrigerator leads the piston phase of the lower-stage Stirling refrigerator by α, so that its room-temperature side is located on the side of the electric drive device; wherein, α = 360° / n, and n is an integer greater than or equal to 3.

[0044] In summary, the reverse cycle system of the loop double-acting Stirling heat engine provided by the embodiments of the present invention can adjust the phase relationship of the operation of each piston by adjusting the direction of the input current, thereby changing the direction of the work flow and the heat transfer direction in the heat pump / refrigerator, so that the electric drive device 100 is always in a room temperature environment: when used as a heat pump, adjusting the piston phase of the upper-stage heat pump to lag behind the lower-stage unit by 90° (taking n = 4 as an example) can make its high-temperature (higher than 100 °C) heat supply side away from the electric drive device side, thus solving the problem of the high-temperature limitation of the compressor in the traditional free-piston Stirling heat pump; when used as a refrigerator, a reverse electric drive mode is adopted to make its refrigeration end away from the electric drive device 100, and the electric drive device 100 is still at room temperature; in addition, each unit of this system has only one piston. Compared with the Stirling heat engine with a single cylinder and two pistons, the number of moving parts and gap seals in the system is reduced, the complexity of the system is reduced, and the reliability of the system is improved.

[0045] 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 "connected" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0046] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or mode are included in at least one embodiment or mode of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or modes. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or modes described in this specification and the features of different embodiments or modes.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some 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 present invention.

Claims

1. A reverse cycle system of a loop double-acting Stirling heat engine, characterized in that, Comprising: n Stirling heat pumps (200) / Stirling refrigerators (300), and the n Stirling heat pumps (200) / Stirling refrigerators (300) are connected end to end through a connecting pipe (207) to form a loop; An electric drive device (100), which is connected to each Stirling heat pump (200) / Stirling refrigerator (300) through a main piston connecting rod (1); the electric drive device (100) is used to drive the reciprocating motion of the main pistons in each Stirling heat pump (200) / Stirling refrigerator (300); and it can achieve the switching between the refrigeration state and the heat pump state according to different usage scenarios.

2. The reverse cycle system of the loop double-acting Stirling heat engine according to claim 1, characterized in that, The electric drive device (100) includes a plurality of linear compressors, and the linear compressors are arranged corresponding to the Stirling heat pumps (200) / Stirling refrigerators (300); the linear compressors drive the reciprocating motion of the main pistons of each Stirling heat pump (200) / refrigerator (300) through forward current drive or reverse current drive.

3. The reverse cycle system of the loop double-acting Stirling heat engine according to claim 2, characterized in that, The linear compressor includes: A back cavity (111); A mover (112), which is connected to the main piston connecting rod (1); An inner stator (113) and an outer stator (114), both of which are arranged in the back cavity (111), and the inner stator (113) and the outer stator (114) are respectively located inside and outside the mover (112); the input electric energy generates an alternating magnetic field through the coils of the inner stator (113) and the outer stator (114), and the mover (112) is driven by electromagnetic force under the action of the magnetic field and reciprocates along a straight line direction.

4. The reverse cycle system of the loop double-acting Stirling heat engine according to claim 1, characterized in that, The electric drive device (100) includes a crank connecting rod mechanism, and adjusts the phase relationship of the main pistons of each Stirling heat pump (200) through the number of unit arrangements of the crank connecting rod mechanism, and the rotary motion drives the reciprocating motion of the piston.

5. The loop double-acting Stirling heat engine reverse cycle system according to claim 4, characterized in that The crank connecting rod mechanism includes: A main journal (121), which is connected to the main piston connecting rod (1); A crank (122), which is arranged on the main journal (121); A connecting rod journal (123), which forms a crank throw with the adjacent main journal (121), and the crank throws are arranged in one-to-one correspondence with the main piston connecting rod (1); A balance weight (124), which is arranged on the crank (122); A flywheel, which is used to provide power.

6. The loop double-acting Stirling heat engine reverse cycle system according to claim 1, characterized in that, The electric drive device (100) includes a swash plate structure, and converts the rotary motion of the swash plate structure into the reciprocating motion of the main piston.

7. The reverse cycle system of a loop double-acting Stirling heat engine according to claim 6, characterized in that, The swash plate structure includes: A main shaft (131), which is connected to a drive structure; A swash plate (132), which is sleeved obliquely on the outer periphery of the main shaft (131); A slipper (133), which is arranged on the swash plate (132); A slipper seat (134), which is slidably connected to the slipper (133), and the slipper seat (135) is connected to the main piston connecting rod (1).

8. The reverse cycle system of a loop double-acting Stirling heat engine according to any one of claims 1-7, characterized in that, The Stirling heat pump (200) includes a room-temperature heat exchanger (201), a regenerator (202), and a high-temperature heat exchanger (203) arranged in sequence. A main piston (204) is slidably arranged inside the room-temperature heat exchanger (201), the regenerator (202), and the high-temperature heat exchanger (203). One end of the main piston (204) close to the electric drive device (100) is an expansion chamber (205); the end of the main piston (204) far from the electric drive device (100) is a compression chamber (206); adjacent expansion chambers (205) are hermetically connected through the connecting pipe (207).

9. The reverse cycle system of the loop double-acting Stirling heat engine according to claim 8, characterized in that, 3≤n≤6。 10. A method for operating an inverse cycle system of a loop double-acting Stirling heat engine, characterized in that, Using the reverse cycle system of the loop double-acting Stirling heat engine according to any one of claims 1-9, comprising: Driving and adjusting the reciprocating motion of the main pistons of n Stirling heat pumps (200) / Stirling refrigerators (300) through an electric drive device (100); the switching between the refrigeration function and the heat pump function can be realized according to different usage scenarios; by adjusting the input current flow direction of the electric drive device, the phase relationship between adjacent pistons in the system can be changed, so as to change the direction of the internal acoustic power flow and heat transfer, and ensure that the electric drive device works in a room-temperature environment; wherein, when in the heat pump function, adjusting the piston phase of the upper-stage Stirling heat pump (200) lags behind the piston phase of the lower-stage Stirling heat pump (200) by α, so that the low-temperature side is located on the side of the electric drive device; when used as a refrigerator, adjusting the piston phase of the upper-stage Stirling refrigerator (300) leads the piston phase of the lower-stage Stirling refrigerator (300) by α, so that the electric drive device is located on the room-temperature side; wherein, α = 360° / n, and n is an integer greater than or equal to 3.

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