Rotary stirling refrigerator

Abstract

This application discloses a rotary Stirling refrigerator, including a body and an expansion assembly disposed within the body. The expansion assembly includes an expansion cylinder and an expansion piston. The expansion cylinder has a through-hole extending radially through it, and the expansion piston has a through-channel. The through-channel has a first end and a second end opposite to each other. The first end penetrates the end of the expansion piston, and the second end penetrates the side wall of the expansion piston. The outer side wall of the expansion piston has a first through-groove communicating with the second end. The first through-groove extends circumferentially along the expansion piston, and in the axial direction of the expansion piston, the size of the first through-groove is larger than the diameter of the through-hole. Using the above-described rotary Stirling refrigerator, even when the position of the expansion cylinder deviates, the first through-groove can still correspond to and communicate with the through-hole on the expansion cylinder, achieving communication between the through-hole and the through-channel. This ensures that the gas flow rate between the expansion chamber and the compression chamber meets the requirements, thereby ensuring the stable refrigeration effect of the rotary Stirling refrigerator.

Description

Technical Field

[0001] This application belongs to the field of Stirling refrigeration equipment technology, specifically relating to a rotary Stirling refrigeration machine. Background Technology

[0002] Rotary integral Stirling refrigerators offer advantages such as compact design, light weight, and high efficiency, making them a core component of cooled infrared detectors and playing a vital role in aerospace, military, and industrial fields. As the only component with mechanical movement in a cooled infrared detector system, its lifespan is a key factor limiting the reliability of the entire system.

[0003] An integrated Stirling refrigerator integrates the compression and expansion components via an eccentric shaft, maintaining a 90° angle of movement between them as the shaft rotates. Currently, integrated Stirling refrigerators typically have channels in the casing and expansion piston. The channel in the casing connects to the compression chamber, and the channel on the expansion piston connects to the expansion chamber. An opening in the expansion cylinder connects the casing channels and the expansion piston channels, thus enabling communication between the compression and expansion chambers. However, due to the long-term high-frequency movement of the expansion piston, the position of the expansion cylinder may shift, causing the opening in the expansion cylinder to misalign with the expansion piston channel. This affects the gas flow between the compression and expansion chambers, consequently impacting the refrigerator's cooling performance. Utility Model Content

[0004] The technical problem to be solved by this application is that the long-term high-frequency movement of the existing expansion piston may cause the expansion cylinder to shift in position, affecting the gas flow between the compression chamber and the expansion chamber. In order to solve this technical problem, a rotary Stirling refrigerator is provided that can ensure that the opening on the expansion cylinder corresponds to the expansion piston channel, so as to avoid affecting the gas flow.

[0005] The technical solution proposed in this application is as follows:

[0006] A rotary Stirling refrigerator, comprising:

[0007] Organism;

[0008] An expansion assembly includes an expansion cylinder and an expansion piston. The expansion cylinder is disposed within the machine body, and the expansion piston is movably disposed within the expansion cylinder. The expansion cylinder has a through hole extending radially through it, and the expansion piston has a through channel. The through channel has a first end and a second end opposite to each other. The first end extends through the end of the expansion piston, and the second end extends through the side wall of the expansion piston.

[0009] The expansion piston has a first connecting groove on its outer side wall that communicates with the second end. The first connecting groove extends circumferentially along the expansion piston, and the size of the first connecting groove is larger than the diameter of the connecting hole in the axial direction of the expansion piston. During the movement of the expansion piston, the first connecting groove can correspond to and communicate with the connecting hole in the radial direction of the expansion piston.

[0010] In the rotary Stirling refrigerator described above, a first connecting groove is formed on the outer wall of the expansion piston, communicating with the second end. The axial dimension of the first connecting groove is larger than the diameter of the connecting hole, and the first connecting groove extends circumferentially. Therefore, when the position of the expansion cylinder deviates, the first connecting groove can correspond to and communicate with the connecting hole on the expansion cylinder, thereby achieving communication between the connecting hole and the connecting channel. This ensures that the gas flow rate between the expansion chamber and the compression chamber meets the requirements, and thus ensures the stable refrigeration effect of the rotary Stirling refrigerator.

[0011] Furthermore, the body is provided with an air intake channel, one end of which corresponds to and is connected to the connecting hole;

[0012] The outer wall of the expansion cylinder is also provided with a second communicating groove that communicates with the communicating hole, and the second communicating groove extends along the circumference of the expansion cylinder.

[0013] In the axial direction of the expansion cylinder, the size of the second connecting groove is larger than the size of the intake passage facing the connecting hole.

[0014] Furthermore, in the axial direction of the expansion cylinder, the size of the second connecting groove is 1.5 to 2.3 times the size of the intake passage facing the connecting hole.

[0015] Furthermore, the second connecting groove is an annular groove.

[0016] Furthermore, the expansion cylinder has connecting holes on both opposite sides.

[0017] Furthermore, the number of air intake channels is at least two.

[0018] Furthermore, the first connecting groove is an annular groove.

[0019] Furthermore, the connecting channel has two second ends, which respectively penetrate the opposite sides of the expansion piston.

[0020] In summary, the rotary Stirling refrigerator provided in this application has at least the following advantages:

[0021] 1. By opening a first connecting groove on the outer wall of the expansion piston, when the expansion cylinder body is offset, the connecting hole and the connecting channel can be connected through the first connecting groove, and the gas flow can be ensured to be normal, without affecting the gas flow between the compression chamber and the expansion chamber, thus ensuring stable cooling effect.

[0022] 2. By opening a second connecting groove on the outer wall of the expansion cylinder, when the expansion cylinder is offset, the connecting hole and the air intake channel can be connected through the second connecting groove, which can ensure normal gas flow and will not affect the gas flow between the compression chamber and the expansion chamber, thus ensuring stable cooling effect.

[0023] 3. It has at least two air intake channels, which, together with the first and second connecting slots, can increase the gas flow rate and thus improve the cooling effect. Attached Figure Description

[0024] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0025] Figure 1 A cross-sectional view of a rotary Stirling refrigerator provided in an embodiment of this application;

[0026] Figure 2 for Figure 1 A schematic diagram of the expansion cylinder in a rotary Stirling refrigerator is shown.

[0027] Figure 3 for Figure 1 The diagram shows the air intake passage in a rotary Stirling refrigerator.

[0028] Label Explanation:

[0029] 10. Body; 11. Intake passage; 12. Arc groove; 20. Expansion assembly; 21. Expansion cylinder; 211. Connecting hole; 212. Second connecting groove; 22. Expansion piston; 221. Connecting passage; 221a. First end; 221b. Second end; 222. First connecting groove; 30. Compression assembly; 41. Expansion chamber; 42. Compression chamber. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] To facilitate understanding of the technical solution of this application, the structure and defects of existing rotary Stirling refrigerators are described below:

[0037] Existing rotary Stirling refrigerators include a main body and an expansion assembly and a compression assembly housed within it. The expansion assembly and the main body form an expansion chamber, and the compression assembly and the main body form a compression chamber. An intake channel connecting the expansion and compression chambers is provided on the main body. The expansion assembly includes an expansion cylinder and an expansion piston, with a channel on the piston communicating with the expansion chamber. This channel extends through the side wall of the expansion piston, forming an opening. A connecting hole is provided on the expansion cylinder. Under normal circumstances, one end of the intake channel corresponds to and communicates with the connecting hole. During the movement of the expansion piston, the opening on the side wall of the expansion piston aligns with and communicates with the connecting hole, thus connecting the expansion and compression chambers. However, under long-term, high-frequency movement of the expansion piston, the position of the expansion cylinder may shift. This could lead to a misalignment between the connecting hole on the expansion cylinder and the opening on the side wall of the expansion piston, or a misalignment between the connecting hole on the expansion cylinder and the intake channel, thereby affecting the gas flow between the compression and expansion chambers and consequently impacting the refrigerator's cooling performance.

[0038] It should also be noted that the deviation of the expansion cylinder may be due to a shift in the axial position of the expansion cylinder or a rotation of the expansion cylinder, that is, a shift in its circumferential position, which causes the position of the connecting hole on the expansion cylinder relative to the machine body and the expansion piston to shift.

[0039] like Figure 1 As shown, in one embodiment, this application provides a rotary Stirling refrigerator, including a body 10 and an expansion assembly 20 and a compression assembly 30 disposed within the body 10. The expansion assembly 20 can form an expansion chamber 41 with the body 10, and the compression assembly 30 can form a compression chamber 42 with the body 10. It should be noted that, as described above, in a rotary Stirling refrigerator, it is conventional for the expansion assembly 20 and the compression assembly 30 to form the expansion chamber 41 and the compression chamber 42 with the body 10, respectively, and will not be elaborated upon here.

[0040] Furthermore, the expansion assembly 20 includes an expansion cylinder 21 and an expansion piston 22. The expansion cylinder 21 is disposed inside the body 10, and the expansion piston 22 is movably disposed inside the expansion cylinder 21. The expansion cylinder 21 has a through hole 211 extending radially through it, and the expansion piston 22 has a through channel 221. The through channel 221 has a first end 221a and a second end 221b. The first end 221a extends through the end of the expansion piston 22 to communicate with the expansion chamber 41, and the other end extends through the side wall of the expansion piston 22.

[0041] The expansion piston 22 has a first connecting groove 222 on its outer side wall that communicates with the second end 221b. The first connecting groove 222 extends circumferentially along the expansion piston 22, and the size of the first connecting groove 222 is larger than the space of the connecting hole 211 in the axial direction of the expansion piston 22. During the movement of the expansion piston 22, the first connecting groove 222 can correspond to and communicate with the connecting hole 211 in the radial direction of the expansion piston 22.

[0042] It should be noted that since the expansion piston 22 and the expansion cylinder 21 are identical in the axial, radial and circumferential directions, the following descriptions of the axial, radial and circumferential directions of the expansion piston 22 and the expansion cylinder 21 are simply referred to as axial, radial and circumferential.

[0043] In the rotary Stirling refrigerator described above, a first connecting groove 222 is formed on the outer wall of the expansion piston 22, communicating with the second end 221b. The axial dimension of the first connecting groove 222 is larger than the diameter of the connecting hole 211, and the first connecting groove 222 extends circumferentially. Therefore, when the position of the expansion cylinder 21 deviates, the first connecting groove 222 can still correspond to and communicate with the connecting hole 211 on the expansion cylinder 21, thereby achieving communication between the connecting hole 211 and the connecting channel 221. This ensures that the gas flow rate between the expansion chamber 41 and the compression chamber 42 meets the requirements and does not lead to a decrease or significant decrease in gas flow rate, thus ensuring the stable cooling effect of the rotary Stirling refrigerator.

[0044] It should be explained that the dimensions of the first connecting groove 222 (axial, circumferential and radial dimensions, i.e. width, length and depth) can be set according to the actual situation. For example, it can be set according to the offset of the expansion cylinder 21 in actual application, so that after the expansion cylinder 21 is offset, the first connecting groove 222 can connect the connecting hole 211 and the connecting channel 221 and ensure the normal gas flow.

[0045] Specifically Figure 1In the illustrated embodiment, the first connecting groove 222 is an annular groove, which allows for communication between the connecting hole 211 and the connecting channel 221 after the expansion cylinder 21 rotates at any angle. Furthermore, the connecting channel 221 has two second ends 221b, which respectively penetrate through opposite sides of the expansion piston 22 and are both able to communicate with the annular first connecting groove 222 to further increase the gas flow rate.

[0046] In one embodiment, as described above, the body 10 has an air intake channel 11, one end of which corresponds to and communicates with the connecting hole 211, and the other end, away from the connecting hole 211, communicates with the compression chamber 42. Further, please refer to... Figure 2 The outer wall of the expansion cylinder 21 is provided with a second connecting groove 212 that communicates with the connecting hole 211. The second connecting groove 212 extends circumferentially, and in the axial direction, the size of the second connecting groove 212 is larger than the size of the intake channel 11 at the end facing the connecting hole 211.

[0047] It should be explained that both ends of the intake passage 11 penetrate the body 10 and form openings. One opening communicates with the compression chamber 42, while the other opening faces and communicates with the connecting hole 211. Axially, the size of the second connecting groove 212 is larger than the size of the opening of the intake passage 11 facing the connecting hole 211. Thus, even if the expansion cylinder 21 shifts position, the intake passage 11 can still communicate with the connecting hole 211 through the second connecting groove 212 without affecting the gas flow, thereby ensuring stable cooling performance.

[0048] In practical applications, axially, the size of the second connecting groove 212 is 1.5 to 2.3 times the size of the end of the air intake channel 11 facing the connecting hole 211. Simultaneously, the size of the second connecting groove 212 is also 25% to 30% of the length of the expansion cylinder 21. The depth can be determined based on the gas flow rate, for example, it can be 0.1 mm, 0.2 mm, or 0.3 mm, and is not limited here. Furthermore, the size of the first connecting groove 222 can be the same as the size of the second connecting groove 212.

[0049] It should be noted that, under normal circumstances, in the axial direction, the connecting hole 211 is located in the middle position of the second connecting groove 212, and the connecting hole 211 corresponds to the opening formed by the air intake channel 11. Additionally, with... Figure 1 For example, if the expansion cylinder 21 always shifts to the left axially and never to the right during application, the connecting hole 211 can be located on the left side of the second connecting groove 212. Of course, those skilled in the art can make the setting according to the actual situation, and there are no restrictions here.

[0050] In one embodiment, the second connecting groove 212 is an annular groove, which allows the connecting hole 211 and the intake passage 11 to be connected after the expansion cylinder 21 rotates at any angle. Furthermore, connecting holes 211 are provided on both opposite sides of the expansion cylinder 21, and both connecting holes 211 are connected to the second connecting groove 212.

[0051] In other embodiments, an arc-shaped groove 12 may also be formed on the body 10. The arc-shaped groove 12 extends circumferentially and surrounds the expansion cylinder 21. The air intake channel 11 communicates with the arc-shaped groove 12, and both connecting holes 211 correspond to and communicate with the arc-shaped groove 12. Thus, in this embodiment, when the expansion cylinder 21 rotates circumferentially, the arc-shaped groove 12 can ensure that the air intake channel 11 communicates with the connecting hole 211. The second connecting groove 212 can ensure that when the expansion cylinder 21 shifts axially, the air intake channel 11 remains connected to the connecting hole 211 without affecting the gas flow rate.

[0052] like Figure 3 As shown, in one embodiment, the number of air intake channels 11 is at least two to further increase the gas flow rate and improve the cooling effect. Specifically... Figure 1 and Figure 3 In the embodiment shown, there are two intake channels 11, and the two intake channels 11 are along... Figure 1 They are arranged at intervals in the direction perpendicular to the paper.

[0053] Based on this, in the rotary Stirling refrigerator provided in this application, the flow path of gas between the compression chamber 42 and the expansion chamber 41 is as follows: taking the gas entering the expansion chamber 41 from the compression chamber 42 as an example, the gas enters the intake channel 11 from the compression chamber 42, then enters the communication hole 211 from the intake channel 11 through the second communication groove 212, then enters the communication channel 221 through the first communication groove 222, and finally enters the expansion chamber 41 through the communication channel 221.

[0054] In summary, the rotary Stirling refrigerator provided in this application has at least the following advantages:

[0055] 1. By opening a first connecting groove 222 on the outer side wall of the expansion piston 22, when the expansion cylinder 21 is offset, the connecting hole 211 and the connecting channel 221 can be connected through the first connecting groove 222, and the gas flow can be ensured to be normal, without affecting the gas flow between the compression chamber 42 and the expansion chamber 41, thus ensuring stable cooling effect.

[0056] 2. By opening a second connecting groove 212 on the outer side wall of the expansion cylinder 21, when the expansion cylinder 21 is offset, the connecting hole 211 and the air intake channel 11 can be connected through the second connecting groove 212, and the gas flow can be ensured to be normal, without affecting the gas flow between the compression chamber 42 and the expansion chamber 41, thus ensuring stable cooling effect.

[0057] 3. It has at least two air intake channels 11, which, together with the first connecting groove 222 and the second connecting groove 212, can increase the gas flow rate and thus improve the cooling effect.

[0058] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary Stirling refrigerator, characterized in that, include: Organism; An expansion assembly includes an expansion cylinder and an expansion piston. The expansion cylinder is disposed within the machine body, and the expansion piston is movably disposed within the expansion cylinder. The expansion cylinder has a through hole extending radially through it, and the expansion piston has a through channel. The through channel has a first end and a second end opposite to each other. The first end extends through the end of the expansion piston, and the second end extends through the side wall of the expansion piston. The expansion piston has a first connecting groove on its outer side wall that communicates with the second end. The first connecting groove extends circumferentially along the expansion piston, and the size of the first connecting groove is larger than the diameter of the connecting hole in the axial direction of the expansion piston. During the movement of the expansion piston, the first connecting groove can correspond to and communicate with the connecting hole in the radial direction of the expansion piston.

2. The rotary Stirling refrigerator according to claim 1, characterized in that, The body is provided with an air intake channel, one end of which corresponds to and is connected to the connecting hole; The outer wall of the expansion cylinder is also provided with a second communicating groove that communicates with the communicating hole, and the second communicating groove extends along the circumference of the expansion cylinder. In the axial direction of the expansion cylinder, the size of the second connecting groove is larger than the size of the intake passage facing the connecting hole.

3. The rotary Stirling refrigerator according to claim 2, characterized in that, In the axial direction of the expansion cylinder, the size of the second connecting groove is 1.5 to 2.3 times the size of the intake passage facing the connecting hole.

4. The rotary Stirling refrigerator according to claim 2, characterized in that, The second connecting groove is an annular groove.

5. The rotary Stirling refrigerator according to claim 4, characterized in that, The expansion cylinder has connecting holes on both opposite sides.

6. The rotary Stirling refrigerator according to claim 2, characterized in that, The number of air intake channels is at least two.

7. The rotary Stirling refrigerator according to claim 1, characterized in that, The first connecting groove is an annular groove.

8. The rotary Stirling refrigerator according to claim 7, characterized in that, The connecting channel has two second ends, which respectively penetrate through opposite sides of the expansion piston.

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