Double-effect circulating Stirling refrigerator

Abstract

The invention belongs to the technical field of refrigeration equipment, and particularly relates to a double-effect circulating Stirling cryocooler. According to the technology, a shell and coil windings are included, an annular piston cavity is formed in the shell, a plurality of piston rotors are arranged in the piston cavity, permanent magnets arranged on any two adjacent piston rotors repel each other, and the coil windings are evenly arranged on the outer side wall of the shell along the piston cavity. The piston rotor can be driven to move according to the specified sequence and direction by controlling the electrifying sequence of the coil windings. The noise generated when the Stirling cryocooler works is effectively reduced, the user experience is improved, the structure utilization rate is higher, and the working efficiency is higher.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration equipment, and in particular relates to a double-effect cycle Stirling refrigerator. Background Art

[0002] A Stirling refrigerator is a mechanical refrigeration device driven by electricity. Its working principle is based on the Stirling cycle, also known as the constant-volume regenerative cycle. The Stirling refrigerator achieves the refrigeration effect by cyclically compressing and expanding gas. Due to its advantages such as compact structure, wide working temperature range, fast startup, high efficiency, and simple operation, it is widely used in low-temperature fields such as aerospace, missile guidance, and remote sensing and telemetry.

[0003] However, when the existing Stirling refrigerators work, due to large dry friction and low reliability, they all have the defects of relatively large noise and low efficiency.

[0004] Therefore, how to reduce the noise generated by the Stirling refrigerator during operation and improve its working efficiency has been a technical problem that those skilled in the art have always wanted to solve but have not been able to solve. Summary of the Invention

[0005] The purpose of the present invention is to provide a double-effect cycle Stirling refrigerator, which can effectively reduce the noise generated by the Stirling refrigerator during operation and improve the efficiency and structural utilization rate.

[0006] The double-effect cycle Stirling refrigerator includes a housing and coil windings. A ring-shaped piston chamber is formed in the housing. A plurality of piston movers are installed in the piston chamber, and the permanent magnets carried by any two adjacent piston movers repel each other. A plurality of coil windings are uniformly arranged along the piston chamber on the outer side wall of the housing. By controlling the energization sequence of the plurality of coil windings, the piston movers can be driven to move in a specified order and direction.

[0007] The present invention applies the principle of a stepper motor to the drive structure of the Stirling refrigerator. Among them, a plurality of piston movers are arranged in a ring-shaped housing, and a plurality of coil windings are arranged at fixed intervals on the outer circumference of the housing. The energization of the coil windings generates a magnetic field that repels the magnetic field of the piston movers to drive the piston movers to move along the piston chamber. Therefore, by changing the energization sequence of each coil winding, it is possible to achieve contactless driving of the piston movers in the housing to move in a specified order and direction, thereby effectively reducing the noise generated by the Stirling refrigerator during operation, improving the user experience, and providing the possibility for the Stirling refrigeration system to be applied to more usage scenarios. At the same time, since the present invention adopts a contactless drive structure, it reduces the parameter sensitivity and reduces the components, which is beneficial to improving the reliability of the refrigeration system.

[0008] Furthermore, both the housing and the piston chamber are annular in shape.

[0009] Using an annular housing and piston chamber not only makes the structure more compact and has a higher structural utilization rate, but also reduces the production difficulty, which is beneficial to reducing the implementation cost of the present invention.

[0010] Furthermore, the housing is composed of an outer housing and an inner housing, and the piston chamber is formed between the outer housing and the inner housing.

[0011] With the above design, the piston chamber is formed by combining the outer housing and the inner housing, which can reduce the production difficulty and is beneficial to reducing the implementation cost of the present invention.

[0012] Furthermore, a magnetic isolation block is provided between two adjacent coil windings.

[0013] By providing the magnetic isolation block, the isolation effect between the energized and non-energized coil windings can be enhanced, so that after the coil windings are energized in the required order, the position of the piston mover can be accurately controlled, thus ensuring the control accuracy and usage effect of the refrigerator of the present invention.

[0014] Furthermore, it further includes a cold cycle device and a heat dissipation component. The cold cycle device is fixedly connected to one side of the coil winding and the magnetic isolation block, and the heat dissipation component is fixedly connected to the other side of the coil winding and the magnetic isolation block.

[0015] Through the heat dissipation component, the hot end of the Stirling refrigerator can be dissipated, and through the cold cycle device, heat exchange can be carried out with the cold end of the Stirling refrigerator, so as to achieve refrigeration in the required usage scenario.

[0016] Furthermore, the heat dissipation component includes a heat conducting plate and heat dissipation fins. The heat conducting plate is arc-shaped, and its inner surface contacts the circumferential outer surface of the coil winding and the magnetic isolation block, and a plurality of the heat dissipation fins are fixed on the outer surface of the heat conducting plate.

[0017] With the heat dissipation component having the above structure, it can fully fit the outer circumferential surface of the coil winding and the magnetic isolation block, so as to fully transfer the heat generated at the hot end of the Stirling refrigerator to the heat dissipation fins, and then fully contact with the control through the heat dissipation fins to dissipate the heat at the hot end of the Stirling refrigerator, effectively ensuring the heat dissipation effect and ensuring that the Stirling refrigerator can operate for a long time.

[0018] Furthermore, the heat dissipation fins are evenly distributed on the heat conducting plate, and the central points of the outer ends of the plurality of heat dissipation fins are distributed on the same circular arc.

[0019] With the above design, the heat sink can evenly dissipate the heat on the heat conducting plate through heat exchange with air, ensuring that the entire heat conducting plate can dissipate heat evenly, effectively avoiding the phenomenon that the coil winding at a corresponding position overheats and cannot work properly due to poor heat dissipation in a certain part, and ensuring the heat dissipation effect.

[0020] Furthermore, a first heat accumulator and a second heat accumulator are provided over the coil winding and the magnetic isolation block between the cold cycle device and the heat dissipation component. The first heat accumulator is located on the left side of the second heat accumulator. The first heat accumulator and the second heat accumulator are connected by a heat conducting device. There is a gap between the heat conducting device and the cold cycle device. Heat insulation layers are embedded between the cold cycle device and the first heat accumulator, between the cold cycle device and the second heat accumulator, between the heat dissipation component and the first heat accumulator, and between the heat dissipation component and the second heat accumulator.

[0021] The present invention collects heat in the intermediate process through the first heat accumulator and the second heat accumulator, and can achieve heat conduction between the first heat accumulator and the second heat accumulator through the heat conducting device. At the same time, the setting of the gap avoids heat exchange between the cold end of the refrigerator and the heat storage section, thereby affecting the refrigeration efficiency. The heat insulation layer provides heat insulation protection between different functional areas, thus overcoming the defects of poor heat exchange performance and poor waste heat recovery effect of the Stirling refrigerator in the prior art, reducing energy loss, and improving the efficiency and operation stability of the entire refrigerator.

[0022] Furthermore, the outer surfaces in the circumferential direction of the cold cycle device, the second heat accumulator, the heat dissipation component, and the first heat accumulator are all arc-shaped and located on the same circumference.

[0023] Based on the above design, the overall structure of the present invention is circular, which is not only more beautiful, but also the circular structure can have the optimal heat exchange area under the same conditions, thereby overcoming the defects of poor heat exchange performance and poor waste heat recovery effect of the Stirling refrigerator in the prior art and reducing energy loss.

[0024] Furthermore, the number of piston movers is four, namely the first piston, the second piston, the third piston, and the fourth piston. The first piston, the second piston, the third piston, and the fourth piston are arranged in sequence along the counterclockwise direction of the piston chamber.

[0025] The present invention uses the first piston, the second piston, the third piston, and the fourth piston to form two groups of piston movers, and both groups of piston movers move in the annular shell. Compared with the existing Stirling refrigerator with a single group of piston movers, not only is the structural utilization rate higher, but the working efficiency is also higher.

[0026] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention applies the principle of a stepper motor to the drive structure of a Stirling refrigerator. Among them, multiple piston movers are arranged in an annular housing, and multiple coil windings are arranged at fixed intervals on the outer circumference of the housing. When the coil windings are energized, a magnetic field is generated and repels the magnetic field of the piston movers to drive the piston movers to move along the piston cavity. Therefore, by changing the energization sequence of each coil winding, it is possible to achieve contactless driving of the piston movers in the housing to move in a specified sequence and direction, thereby effectively reducing the noise generated by the Stirling refrigerator during operation, improving the user experience, and providing the possibility for the Stirling refrigeration system to be applied to more usage scenarios.

[0027] 2. The present invention uses two groups of piston movers, and both groups of piston movers move in an annular housing. Compared with the existing Stirling refrigerators, it not only has a higher structural utilization rate but also a higher working efficiency.

[0028] 3. The present invention adopts a contactless drive structure, reduces parameter sensitivity, reduces components, and is beneficial to improving the reliability of the refrigeration system.

[0029] 4. The present invention collects heat during the intermediate process through the first regenerator and the second regenerator, overcomes the defects of poor heat exchange performance and poor waste heat recovery effect of the Stirling refrigerator in the prior art, and reduces energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic diagram of the present invention in the first state; Figure 3 is a schematic diagram of the present invention in the second state; Figure 4 is a schematic diagram of the present invention in the third state; Figure 5 is a schematic structural diagram of the housing; Figure 6 is a schematic structural diagram of the heat dissipation component.

[0031] Names of each component in the figure: 1. Housing; 1.1. Piston cavity; 1.2. Outer housing; 1.3. Inner housing; 2. First piston; 3. Second piston; 4. Third piston; 5. Fourth piston; 6. Cold cycle device; 7. Coil winding; 8. Magnetic isolation block; 9. Heat dissipation component; 9.1. Heat conducting plate; 9.2. Heat sink; 10. First regenerator; 11. Second regenerator / 12. Heat conducting device; 13. Thermal insulation layer; 14. Gap. DETAILED DESCRIPTION OF THE INVENTION

[0032] The present invention will be further described below with reference to the accompanying drawings through specific embodiments, but the present invention is not limited thereto. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. Embodiment

[0033] See Figures 1-6 , an embodiment of the present invention provides a double-effect cyclic Stirling refrigerator, which includes a housing 1, a cold cycle device 6, a coil winding 7, a magnetic isolation block 8, a heat dissipation component 9, a first regenerator 10, and a second regenerator 11. A circular piston chamber 1.1 is formed in the housing 1. A plurality of piston movers are installed in the piston chamber 1.1, and the permanent magnets carried by any two adjacent piston movers repel each other. The piston movers are composed of a first piston 2, a second piston 3, a third piston 4, and a fourth piston 5, and the first piston 2, the second piston 3, the third piston 4, and the fourth piston 5 are arranged in sequence along the counterclockwise direction of the piston chamber 1.1. The first piston 2 and the second piston 3 cooperate with each other, and the third piston 4 and the fourth piston 5 cooperate with each other. A plurality of coil windings 7 are uniformly arranged on the outer side wall of the housing 1 along the piston chamber 1.1. By controlling the energization sequence of the coil windings 7, the piston movers can be driven to move in a specified sequence and direction. The magnetic isolation block 8 is arranged between two adjacent coil windings 7. The cold cycle device 6 is fixedly connected to one side of the coil winding 7 and the magnetic isolation block 8, and the heat dissipation component 9 is fixedly connected to the other side of the coil winding 7 and the magnetic isolation block 8. The first regenerator 10 and the second regenerator 11 are covered on the coil windings 7 and the magnetic isolation block 8 between the cold cycle device 6 and the heat dissipation component 9, and the first regenerator 10 is located on the left side of the second regenerator 11.

[0034] The present invention applies the principle of a stepper motor to the drive structure of a Stirling refrigerator. Among them, two sets of piston movers composed of a first piston 2, a second piston 3, a third piston 4, and a fourth piston 5 (for easy distinction, the four pistons are respectively marked as A, B, C, and D in the attached drawings) are arranged in an annular housing 1. A plurality of coil windings 7 are arranged on the outer circumference of the housing 1 at fixed intervals. By energizing the coil windings 7 to generate a magnetic field that repels the magnetic field of the piston movers, the piston movers are driven to move along the piston chamber 1.1. Therefore, by changing the energization sequence of each coil winding 7, it is possible to achieve contactless driving of the piston movers in the housing 1 to move in a specified sequence and direction, thereby effectively reducing the noise generated by the Stirling refrigerator during operation, improving the user experience, and providing the possibility for the Stirling refrigeration system to be applied to more usage scenarios. At the same time, since the present invention adopts a contactless drive structure, it reduces parameter sensitivity, reduces components, is beneficial to improving the reliability of the refrigeration system, and adopts two sets of piston movers that both move in the annular housing 1. Compared with the existing Stirling refrigerator with a single set of piston movers, not only is the structural utilization rate higher, but the working efficiency is also higher.

[0035] In addition, through the setting of the magnetic isolation block 8, the isolation effect between the energized and non-energized coil windings 7 can be enhanced, so that after the coil windings 7 are energized in the required sequence, the position of the piston movers can be accurately controlled, thereby ensuring the control accuracy and usage effect of the refrigerator described in the present invention; the hot end of the Stirling refrigerator can be cooled by the heat dissipation component 9, and heat exchange can be carried out with the cold end of the Stirling refrigerator through the cold cycle device 6, so as to achieve refrigeration in the required usage scenarios; the first regenerator 10 and the second regenerator 11 are used to collect heat during the intermediate process, overcoming the defects of poor heat exchange performance and poor waste heat recovery effect of the Stirling refrigerator in the prior art, and reducing energy loss.

[0036] In the specific implementation process, the first regenerator 10 and the second regenerator 11 are connected by a heat conduction device 12. The heat conduction device 12 covers the outside of the cold cycle device 6, the first regenerator 10, and the second regenerator 11, and a gap 14 is provided between the heat conduction device 12 and the cold cycle device 6. Heat insulation layers 13 are embedded between the cold cycle device 6 and the first regenerator 10, between the cold cycle device 6 and the second regenerator 11, between the heat dissipation component 9 and the first regenerator 10, and between the heat dissipation component 9 and the second regenerator 11.

[0037] It can be seen that the heat obtained by the first heat accumulator 10 and the second heat accumulator 11 can be output or conducted to the same structure through the heat conduction device 12. The setting of the gap 14 avoids heat exchange between the cold end of the refrigerator and the heat storage section, thereby affecting the refrigeration efficiency. At the same time, the heat insulation layer 13 provides heat insulation protection between different functional areas, thus overcoming the defects of poor heat exchange performance and poor waste heat recovery effect in the existing Stirling refrigerators, reducing energy loss, and improving the efficiency and operation stability of the entire refrigerator.

[0038] In the embodiment of the present invention, both the housing 1 and the piston chamber 1.1 are annular.

[0039] Using the annular housing 1 and piston chamber 1.1 not only makes the structure more compact and has a higher structural utilization rate, but also reduces the production difficulty, which is beneficial to reducing the implementation cost of the present invention.

[0040] Preferably, the housing 1 is composed of an outer housing 1.2 and an inner housing 1.3. As Figure 5 shown, the piston chamber 1.1 is formed between the outer housing 1.2 and the inner housing 1.3.

[0041] With the above design, the piston chamber 1.1 is formed by combining the outer housing 1.2 and the inner housing 1.3, which can reduce the production difficulty and is beneficial to reducing the implementation cost of the present invention.

[0042] See the appendix Figure 6 , the heat dissipation component 9 includes a heat conduction plate 9.1 and heat dissipation fins 9.2. The heat conduction plate 9.1 is arc-shaped, and its inner surface contacts the circumferential outer surfaces of the coil winding 7 and the magnetic isolation block 8. A plurality of the heat dissipation fins 9.2 are fixed on the outer surface of the heat conduction plate 9.1.

[0043] With the heat dissipation component 9 having the above structure, it can fully fit the outer circumferential surfaces of the coil winding 7 and the magnetic isolation block 8, thereby fully transferring the heat generated at the hot end of the Stirling refrigerator to the heat dissipation fins 9.2, and then fully contacting with the control through the heat dissipation fins 9.2 to dissipate heat from the hot end of the Stirling refrigerator, effectively ensuring the heat dissipation effect and ensuring that the Stirling refrigerator can operate for a long time.

[0044] Furthermore, the heat dissipation fins 9.2 are evenly distributed on the heat conduction plate 9.1, and the central points of the outer ends of the plurality of heat dissipation fins 9.2 are distributed on the same circular arc.

[0045] With the above design, the heat sink 9.2 can evenly dissipate the heat on the heat conducting plate 9.1 through heat exchange with air, ensuring that the entire heat conducting plate 9.1 can dissipate heat evenly, effectively avoiding the phenomenon that the coil winding 7 at a corresponding position overheats and cannot work properly due to poor heat dissipation in a certain part, and ensuring the heat dissipation effect.

[0046] As a preferred embodiment, the outer surfaces of the cold cycle device 6, the second accumulator 11, the heat dissipation component 9, and the first accumulator 10 in the circumferential direction are all arc-shaped and located on the same circumference. The heat conducting device 12 is also arc-shaped and covers the arc formed by the cold cycle device 6, the second accumulator 11, and the heat dissipation component 9 except for the heat dissipation component 9.

[0047] Based on the above design, the overall structure of the present invention is circular, which is not only more beautiful, but also the circular structure can have the optimal heat exchange area under the same conditions, thus overcoming the defects of poor heat exchange performance and poor waste heat recovery effect in the existing Stirling refrigerators, and reducing energy loss.

[0048] See the attached Figure 1 - attached Figure 4 , in this embodiment, the number of the coil windings 7 is 16, that is, the parts numbered 1-16 in the figure. The magnetic isolation blocks 8 are arranged between any two adjacent coil windings 7. Of course, it should be noted that the number of the coil windings 7 is not necessarily 16, and it can be adaptively set according to different control precisions and powers. In this example, the 16 coil windings 7 are divided into four parts, including the coil windings 7 numbered 1-4 at the hot end part, the coil windings 7 numbered 9-12 at the cold end part, the coil windings 7 numbered 5-8 and the coil windings 7 numbered 13-16 as the transition part between the hot end and the cold end. The cold cycle device 6 covers the coil windings 7 numbered 9-12, the first accumulator 10 covers the coil windings 7 numbered 5-8, the second accumulator 11 covers the coil windings 7 numbered 13-16, and the heat dissipation component 9 covers the coil windings 7 numbered 1-4.

[0049] Based on the above structure, the working principle of the present invention is as follows: In the initial state, the first piston 2 and the second piston 3 are in the uncompressed state, and the third piston 4 and the fourth piston 5 are in the compressed state. For the specific positions, please refer to Figure 1 ; The first state, in which the first piston 2 and the second piston 3 are in the isothermal compression state, and the third piston 4 and the fourth piston 5 are in the isothermal expansion state. Specifically: The coil winding 7 numbered 5 is energized to keep the second piston 3 stationary. Then, the coil windings 7 numbered 1 to 4 are energized in the order of 1, 2, 3, 34, driving the first piston 2 to move and stop between the coil windings 7 numbered 3 and 4. The gas between the first piston 2 and the second piston 3 is isothermally compressed, that is, the first piston 2 and the second piston 3 are in the isothermal compression state, and the compressed gas releases heat. At the same time, the third piston 4 and the fourth piston 5 are in the isothermal expansion state. The coil windings 7 numbered 8 and 9 remain energized, and the coil windings 7 numbered 10, 11, 12, 13 are energized in sequence, driving the fourth piston 5 to move to the coil winding 7 numbered 13 to achieve isothermal expansion. The gas between the third piston 4 and the fourth piston 5 absorbs external heat to achieve cooling, as Figure 2 shown; The second state, in which the first piston 2 and the second piston 3 are in the isochoric heat release state, and the third piston 4 and the fourth piston 5 are in the isochoric heat absorption state. Specifically: The coil windings 7 numbered 3 to 11 are energized in the order of 3456, 4567, 5678, 78910, 891011, driving the first piston 2 to move to the coil winding 7 numbered 8 and the second piston 3 to move to the coil winding 7 numbered 10 in a way that keeps the relative positions of the first piston 2 and the second piston 3 unchanged. During the movement, the gas between the first piston 2 and the second piston 3 releases heat at constant volume. At the same time, the corresponding coil windings 7 are energized in the order of the coil windings 7 numbered 8 and 13, 9 and 14, 10 and 15, 11 and 16, 12 and 1, 13 and 2, 14 and 3, 15 and 4, 16 and 5 to drive the third piston 4 to move to the coil winding 7 numbered 16 and the fourth piston 5 to move to the coil winding 7 numbered 5 in a way that keeps the relative positions of the third piston 4 and the fourth piston 5 unchanged. During this process, the gas between the third piston 4 and the fourth piston 5 absorbs heat at constant volume, specifically as Figure 3 shown; The third state, which is the same as the first state. The first piston 2 and the second piston 3 are in the state of expansion and heat absorption, and the third piston 4 and the fourth piston 5 are in the state of compression and heat release. Specifically: The coil winding 7 numbered 8 is energized, and the first piston 2 remains stationary. Then, the coil windings 7 numbered 10 - 13 are energized in the order of 10, 11, 12, 13, driving the second piston 3 to move to the coil winding 7 numbered 13. During this process, the gas between the first piston 2 and the second piston 3 is isothermally expanded and absorbs heat; The coil winding 7 numbered 5 is energized to keep the fourth piston 5 stationary. Then, the coil windings 7 numbered 1 - 4 are energized in the order of 1, 2, 3, 34, driving the third piston 4 to move and stop between the coil windings 7 numbered 3 and 4. As Figure 4 shown, the gas between the third piston 4 and the fourth piston 5 is isothermally compressed, that is, the third piston 4 and the fourth piston 5 are in the state of isothermal compression, and the compressed gas releases heat; By cycling in this way, the continuous operation of the Stirling refrigerator described in the present invention can be achieved. Embodiment

[0050] The embodiment of the present invention also proposes a control method for the double - effect cycle Stirling refrigerator described in Embodiment 1. The specific steps are as follows: Step 1: The host computer or the controller issues a first control instruction. Based on this first control instruction, the coil winding 7 numbered 5 is energized to keep the second piston 3 stationary. Then, the coil windings 7 numbered 1 - 4 are energized in the order of 1, 2, 3, 34, driving the first piston 2 to move and stop between the coil windings 7 numbered 3 and 4. The gas between the first piston 2 and the second piston 3 is isothermally compressed, that is, the first piston 2 and the second piston 3 are in the state of isothermal compression, and the compressed gas releases heat; At the same time, the third piston 4 and the fourth piston 5 are in the state of isothermal expansion. The coil windings 7 numbered 8 and 9 remain energized, and the coil windings 7 numbered 10, 11, 12, 13 are energized in sequence, driving the fourth piston 5 to move to the coil winding 7 numbered 13 to achieve isothermal expansion. The gas between the third piston 4 and the fourth piston 5 absorbs external heat to achieve temperature reduction. Specifically as Figure 2 shown; Step 2: The host computer or the controller issues a second control instruction. Based on this second control instruction, the coil windings 7 numbered from 3 to 11 are energized in the order of 3456, 4567, 5678, 78910, 891011, so as to drive the first piston 2 to move to the coil winding 7 numbered 8 and the second piston 3 to move to the coil winding 7 numbered 10 in a manner that keeps the relative positions between the first piston 2 and the second piston 3 unchanged. During the movement, the gas between the first piston 2 and the second piston 3 undergoes isochoric heat release; at the same time, the corresponding coil windings 7 are energized in the order of coil winding 8 and 13, coil winding 9 and 14, coil winding 10 and 15, coil winding 11 and 16, coil winding 12 and 1, coil winding 13 and 2, coil winding 14 and 3, coil winding 15 and 4, coil winding 16 and 5 to drive the third piston 4 to move to the coil winding 7 numbered 16 and the fourth piston 5 to move to the coil winding 7 numbered 5 in a manner that keeps the relative positions between the third piston 4 and the fourth piston 5 unchanged. During this process, the gas between the third piston 4 and the fourth piston 5 undergoes isochoric heat absorption, specifically as Figure 3 shown; Step 3: The host computer or the controller issues a third control instruction. Based on this third control instruction, the coil winding 7 numbered 8 is energized and the first piston 2 remains stationary. The coil windings 7 numbered from 10 to 13 are energized in the order of 10, 11, 12, 13 to drive the second piston 3 to move to the coil winding 7 numbered 13. During this process, the gas between the first piston 2 and the second piston 3 undergoes isothermal expansion and heat absorption; the coil winding 7 numbered 5 is energized to keep the fourth piston 5 stationary, and then the coil windings 7 numbered from 1 to 4 are energized in the order of 1, 2, 3, 34 to drive the third piston 4 to stop between the coil windings 7 numbered 3 and 4, as Figure 4 shown, and the gas between the third piston 4 and the fourth piston 5 is isothermally compressed, that is, the third piston 4 and the fourth piston 5 are in an isothermal compression state, and the compressed gas releases heat; Step 4: The host computer or controller issues a fourth control instruction. Based on this fourth control instruction, the coil winding 7 numbered 5 is energized, and the coil windings 7 numbered from 3 to 11 are energized in the order of 3456, 4567, 5678, 78910, 891011, so as to drive the third piston 4 to move to the coil winding 7 numbered 8 and the fourth piston 5 to move to the coil winding 7 numbered 10 in a way that keeps the relative positions between the third piston 4 and the fourth piston 5 unchanged. During the movement, the gas between the third piston 4 and the fourth piston 5 undergoes isochoric heat release; at the same time, the corresponding coil windings 7 are energized in the order of numbered 8 and 13, numbered 9 and 14, numbered 10 and 15, numbered 11 and 16, numbered 12 and 1, numbered 13 and 2, numbered 14 and 3, numbered 15 and 4, numbered 16 and 5, so as to drive the first piston 2 to move to the coil winding 7 numbered 16 and the second piston 3 to move to the coil winding 7 numbered 5 in a way that keeps the relative positions between the first piston 2 and the second piston 3 unchanged. During this process, the gas between the first piston 2 and the second piston 3 undergoes isochoric heat absorption. At this time, the positions of the first piston 2, the second piston 3, the third piston 4, and the fourth piston 5 return to the initial positions as shown in Figure 1 shown; Step 5: Repeat Steps 1 - 4 to achieve continuous control of the operation of the Stirling refrigerator.

[0051] In summary, the present invention applies the principle of a stepper motor to the drive structure of a Stirling refrigerator. Among them, two sets of piston movers composed of the first piston 2, the second piston 3, the third piston 4, and the fourth piston 5 are arranged in the annular housing 1. A plurality of coil windings 7 are arranged at fixed intervals on the outer circumference of the housing 1. The energization of the coil windings 7 generates a magnetic field that repels the magnetic field of the piston movers to drive the first piston 2, the second piston 3, the third piston 4, and the fourth piston 5 to move along the piston chamber 1.1. Therefore, by changing the energization sequence of each coil winding 7, it is possible to drive the first piston 2, the second piston 3, the third piston 4, and the fourth piston 5 in the housing 1 to move in a specified order and direction without contact, thereby effectively reducing the noise generated by the Stirling refrigerator during operation, improving the user experience, and providing the possibility for the Stirling refrigeration system to be applied to more usage scenarios. At the same time, since the present invention adopts a non-contact drive structure, it reduces parameter sensitivity, reduces components, is beneficial to improving the reliability of the refrigeration system, and adopts two sets of piston movers and both sets of piston movers move in the annular housing 1. Compared with the existing Stirling refrigerators with a single set of piston movers, not only is the structural utilization rate higher, but also the working efficiency is higher. In addition, the first regenerator 10 and the second regenerator 11 are also used to collect heat during the intermediate process, overcoming the defects of poor heat exchange performance and poor waste heat recovery effect in the existing Stirling refrigerators, and reducing energy loss.

[0052] The above has introduced in detail the technical solution provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A double-effect cycle Stirling refrigerator, characterized in that: The invention comprises a shell (1) and a coil winding (7), wherein an annular piston cavity (1.1) is formed in the shell (1), a plurality of piston movers are arranged in the piston cavity (1.1), and the permanent magnets of any two adjacent piston movers repel each other. A plurality of coil windings (7) are evenly arranged along the piston cavity (1.1) on the outer wall of the shell (1), and the piston movers can be driven to move in a specified order and direction by controlling the power-on sequence of the plurality of coil windings (7).

2. The double-effect cycle Stirling refrigerator according to claim 1, characterized in that: The housing (1) and the piston chamber (1.1) are both in an annular shape.

3. The double-effect cycle Stirling refrigerator according to claim 2, characterized in that: The housing (1) is composed of an outer housing (1.2) and an inner housing (1.3), and the piston chamber (1.1) is formed between the outer housing (1.2) and the inner housing (1.3).

4. The double-effect cycle Stirling refrigerator according to claim 1, characterized in that: A magnetic isolation block (8) is provided between two adjacent coil windings (7).

5. The double-effect cycle Stirling refrigerator according to claim 4, characterized in that: It also includes a cold circulation device (6) and a heat dissipation assembly (9), wherein the cold circulation device (6) is fixedly connected to the coil winding (7) and the magnetic isolation block (8) on one side, and the heat dissipation assembly (9) is fixedly connected to the coil winding (7) and the magnetic isolation block (8) on the other side.

6. The double-effect cycle Stirling refrigerator according to claim 5, characterized in that: The heat dissipation assembly (9) comprises a heat conduction plate (9.1) and heat sinks (9.2); the heat conduction plate (9.1) is arc-shaped, an inner surface of which contacts the circumferential outer surfaces of the coil winding (7) and the magnetic isolation block (8); and a plurality of heat sinks (9.2) are fixed to the outer surface of the heat conduction plate (9.1).

7. The double-effect cycle Stirling refrigerator according to claim 6, characterized in that: The heat sinks (9.2) are evenly distributed on the heat conducting plate (9.1), and the center points of the outer ends of a plurality of the heat sinks (9.2) are distributed on the same circular arc.

8. The double-effect cycle Stirling refrigerator according to claim 5, characterized in that: A first heat accumulator (10) and a second heat accumulator (11) are provided on the coil winding (7) and the magnetic isolation block (8) between the cold circulation device (6) and the heat dissipation component (9), wherein the first heat accumulator (10) is located on the left side of the second heat accumulator (11), the first heat accumulator (10) and the second heat accumulator (11) are connected via a heat conducting device (12), a gap (14) is provided between the heat conducting device (12) and the cold circulation device (6), and a heat insulation layer (13) is embedded between the cold circulation device (6) and the first heat accumulator (10), between the cold circulation device (6) and the second heat accumulator (11), between the heat dissipation component (9) and the first heat accumulator (10), and between the heat dissipation component (9) and the second heat accumulator (11).

9. The double-effect cycle Stirling refrigerator according to claim 8, characterized in that: The outer surfaces of the cold circulation device (6), the second heat accumulator (11), the heat dissipation assembly (9) and the first heat accumulator (10) in the circumferential direction are all arc-shaped and located on the same circumference.

10. The double-effect cycle Stirling refrigerator according to claims 1-9, characterized in that: The number of the piston movers is four, namely a first piston (2), a second piston (3), a third piston (4), and a fourth piston (5); the first piston (2), the second piston (3), the third piston (4), and the fourth piston (5) are arranged in sequence in a counterclockwise direction along the piston chamber (1.1).

Images