A coupling device of linear split-stirling cryocooler and infrared detector

Abstract

The application discloses a coupling device of a linear split Stirling refrigerator and an infrared detector, which comprises a bottom plate (7) for providing a mounting plane, parallel rails (2) arranged on the bottom plate (7), one of the parallel rails (2) being a scale rail (4), rail sliders arranged on the parallel rails (2), a detector support (8) fixed with the rail sliders and capable of sliding along the parallel rails (2) based on the rail sliders, the detector support (8) being used for supporting a fixed detector Dewar assembly (10), a first refrigerator support (3) and a second refrigerator support (12) fixed on the bottom plate (7) based on the parallel rails (2) and used for fixing refrigerator cold fingers. The coupling device can guarantee that the Dewar cold finger and the refrigerator cold finger are coaxial and consistent during insertion and do not collide, and good cold energy transmission can be realized.

Description

Technical Field

[0001] This application relates to the field of infrared detector Dewar component technology, and more particularly to a coupling device between a linearly split Stirling refrigerator and an infrared detector. Background Technology

[0002] As a crucial component of infrared detectors, the Stirling refrigerator's primary function is to provide an ultra-low temperature operating environment, ensuring the detector's proper functioning. Compared to integrated Stirling refrigerators, linear discrete Stirling refrigerators offer higher reliability, lower noise, and a wider cooling range, giving them a significant advantage in the infrared detector field. The coupling technology between the Stirling refrigerator and the infrared detector directly affects the effective transfer of cooling energy from the refrigerator to the detector, and whether the detector can be cooled to its operating temperature.

[0003] Linear split-type refrigerators and detectors often use a separate coupling method. This involves developing the detector Dewar and the refrigerator separately, inserting the Dewar's cold fingers into the refrigerator's cold fingers, and thermally coupling the lower end face of the Dewar's cold fingers to the upper end face of the refrigerator's cold fingers using thermally conductive silicone grease to achieve good heat transfer. A simplified diagram of the coupling structure between the detector Dewar and the linear split-type refrigerator is shown below. Figure 1 As shown, Figure 1 In the diagram, 101 is the Dewar shell, 102 is the Dewar cold finger, 103 is the non-vacuum interlayer, 104 is the refrigeration unit cold finger, 105 is the expander, and 106 is the compressor.

[0004] The existing coupling method involves using a coordinate measuring machine to measure the depth L1 of the Dewar cold finger and the depth L2 of the cryo-finger cold finger. It is necessary to ensure that the distance between L1 and L2 is within the specified range. This operation is cumbersome and inconvenient. Then, a certain amount of thermal grease is applied to the end face of the cryo-finger cold finger. The Dewar cold finger is then inserted horizontally and slowly into the cryo-finger cold finger by hand. However, during the insertion process, due to the small gap between the cryo-finger cold finger and the Dewar cold finger, the upper end face of the cryo-finger cold finger is prone to bumping against the inner wall of the Dewar cold finger, forming a dent. Moreover, after the bump, the inner wall of the Dewar cold finger is prone to be covered with thermal grease from the end face of the cryo-finger cold finger, which affects the cooling effect of the detector Dewar component. Summary of the Invention

[0005] This application provides a coupling device for a linearly split Stirling refrigerator and an infrared detector to ensure high coaxial consistency between the Dewar cold finger and the refrigerator cold finger during insertion, preventing collisions and ensuring good cold energy transfer.

[0006] This application provides a coupling device for a linear split-type Stirling refrigerator and an infrared detector, comprising:

[0007] Base plate 7 provides a mounting surface;

[0008] Parallel guide rail 2 is set on the base plate 7. One of the parallel guide rails 2 is a scale guide rail 4. A guide rail slider is set on the parallel guide rail 2.

[0009] The detector bracket 8 is fixed to the guide rail slider. Its lower surface does not contact the upper surface of the base plate. It can slide along the direction of the parallel guide rail 2 based on the guide rail slider. The detector bracket 8 is used to support and fix the detector Dewar assembly 10 and to determine the orientation of the axis of the detector Dewar assembly 10.

[0010] The first refrigeration unit bracket 3 and the second refrigeration unit bracket 12 are fixed on the base plate 7 based on the parallel guide rail 2. The first refrigeration unit bracket 3 and the second refrigeration unit bracket 12 cooperate to fix the refrigeration unit cold finger, so that the refrigeration unit cold finger and the detector cold finger maintain coaxiality.

[0011] Optionally, the scale guide rail 4 is further provided with a scale slider 6 to complete the reading based on the scale guide rail 4 and the scale slider 6.

[0012] Optionally, the scale slider 6 is also provided with a rotating gauge 11, one end of which is located close to the detector Dewar assembly 10, and the rotating gauge 11 can rotate freely.

[0013] Optionally, the lower end face of the detector bracket 8 is provided with an oblong hole to fix it to the base plate 7 based on the oblong hole, and to make the detector bracket 8 have a deviation margin in the direction where the plane of the base plate 7 is perpendicular to the parallel guide rail 2.

[0014] Optionally, a positioning pin 9 is also provided on one side of the detector bracket 8. The positioning pin 9 is used to prevent the detector bracket from sliding off the track during the sliding process and to fix the position of the Dewar when measuring the Dewar depth.

[0015] Optionally, the first refrigerator bracket 3 and the second refrigerator bracket 12 cooperate to ensure that the refrigerator cold finger and the detector cold finger maintain coaxiality in two directions perpendicular to the parallel guide rail 2.

[0016] The device in this application embodiment can ensure high coaxial consistency between the Dewar cold finger and the refrigeration unit cold finger during insertion, preventing collisions and ensuring good cold energy transfer.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 A schematic diagram of the coupling structure between the detector Dewar and the linearly separated refrigerator;

[0020] Figure 2 This is a schematic diagram of the coupling tooling structure in an embodiment of this application. Detailed Implementation

[0021] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0022] This application provides a coupling device for a linear split-type Stirling refrigerator and an infrared detector, such as... Figure 2 As shown, it includes:

[0023] Base plate 7 provides a mounting surface.

[0024] A parallel guide rail 2 is mounted on the base plate 7. One of the parallel guide rails 2 is a scale guide rail 4, and a guide rail slider is mounted on the parallel guide rail 2. In some examples, the tooling base plate has a slot in the coupling direction (Y direction), and a parallel guide rail and a scale guide rail are provided at the slot. A guide rail slider is mounted on the parallel guide rail, and the guide rail is fixed to the base plate by screws. In some specific examples, in some embodiments, a scale slider 6 is also provided on the scale guide rail 4 to complete the reading based on the scale guide rail 4 and the scale slider 6. In some embodiments, a rotating gauge 11 is also provided on the scale slider 6. One end of the rotating gauge 11 is located close to the detector Dewar assembly 10, and the rotating gauge 11 can rotate freely. In some specific applications, the scale guide rail can be fixed to the base plate by screws, the scale slider can be fixed to the scale guide rail slider by screws, and the rotating gauge and the scale slider can be fixed by pins to ensure that the rotating gauge can rotate freely.

[0025] The detector bracket 8 is fixed to the guide rail slider, and its lower surface does not contact the upper surface of the base plate. It can slide along the parallel guide rail 2 based on the guide rail slider. The detector bracket 8 is used to support and fix the detector Dewar assembly 10 and to determine the orientation of the detector Dewar assembly 10's axis. In some examples, the detector bracket is used to support and fix the detector Dewar assembly and to determine the X and Z axis positions of the detector axis.

[0026] The first refrigeration unit bracket 3 and the second refrigeration unit bracket 12 are fixed on the base plate 7 based on the parallel guide rail 2. The first refrigeration unit bracket 3 and the second refrigeration unit bracket 12 cooperate to fix the refrigeration unit cold finger, so that the refrigeration unit cold finger and the detector cold finger maintain coaxiality.

[0027] In some embodiments, the first refrigerator bracket 3 and the second refrigerator bracket 12 cooperate to ensure that the refrigerator cold finger and the detector cold finger maintain coaxiality in two directions perpendicular to the parallel guide rail 2, that is, the X-direction and the Z-direction positions.

[0028] The device in this application embodiment can ensure high coaxial consistency between the Dewar cold finger and the refrigeration unit cold finger during insertion, preventing collisions and ensuring good cold energy transfer.

[0029] In some embodiments, the lower end face of the detector bracket 8 is provided with an oblong hole to achieve fixation to the base plate 7 based on the oblong hole, and to ensure that the detector bracket 8 has a deviation margin in the direction perpendicular to the parallel guide rail 2 on the plane of the base plate 7. Based on the oblong hole and fixed to the base plate by screws, a certain deviation margin is ensured for the detector bracket in the X direction.

[0030] In some embodiments, a positioning pin 9 is also provided on one side of the detector bracket 8. The positioning pin 9 is used to prevent the detector bracket from sliding off the track during the sliding process and to fix the position of the Dewar when measuring the Dewar depth.

[0031] The following are application examples of the coupling device in this application embodiment:

[0032] First, wipe and clean the end face and outer wall of the cold finger of the refrigerator, and the inner surface and coupling surface of the cold finger of the Dewar. Place the detector Dewar assembly on the detector bracket, fix the cold finger of the refrigerator using the first refrigerator bracket and the second refrigerator bracket, slide the detector bracket until it abuts against the positioning pin, and use the rotating gauge "A" end to abut against the end face of the cold finger of the refrigerator and the coupling surface of the cold finger of the refrigerator, and record the values ​​as L11 and L12 respectively; use the rotating gauge "B" end to abut against the bottom surface of the cold finger of the Dewar and the coupling surface of the cold finger of the Dewar, and record the values ​​as L21 and L22 respectively. Calculate the distance from the Dewar coupling surface to the bottom of the cold finger (L1 = L11 - L12) and the length of the cold finger of the refrigerator (L2 = L21 - L22), and ensure that L1-L2 is within the specified range.

[0033] Then, apply an appropriate amount of thermal grease to the cold finger end face of the refrigeration unit, and then place the O-ring into the O-ring groove of the flange.

[0034] Finally, use the coupling fixture to couple the components. Adjust the X-direction position of the cold finger of the refrigerator to ensure that the inner wall of the cold finger of the Dewar does not contact the end face of the cold finger of the refrigerator during the coupling process (adjustment is required for the first use). Finally, slide the detector bracket to insert the Dewar horizontally into the cold finger of the refrigerator. Screw the screw into the threaded hole of the Dewar flange to fix the refrigerator and the detector Dewar. Remove the detector assembly from the coupling fixture to complete the coupling.

[0035] The coupling device of this application has wide applicability and versatility. This coupling method can be applied to Dewar assemblies of refrigerators and detectors of different shapes and sizes. The coupling device of this application ensures high coaxiality between the Dewar cold fingers and the refrigerator cold fingers. During the insertion of the Dewar cold fingers into the refrigerator cold fingers, it avoids collisions between the inner wall of the Dewar cold fingers and the end face of the refrigerator cold fingers, ensuring the reliability of the coupling process. Calculations show that the theoretical coaxiality value can be guaranteed to be within 0.07. The coupling device of this application measures the depth of the Dewar cold fingers and the depth of the refrigerator cold fingers via a graduated slide rail, which is more convenient and faster. Compared with the previous coupling method, the coupling efficiency is improved by 3 times.

[0036] It should be noted that, in the embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0037] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0038] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims. All of these forms are within the protection scope of this application.

Claims

1. A coupling device for a linear split-type Stirling refrigerator and an infrared detector, characterized in that, include: Base plate (7) provides a mounting surface; Parallel guide rail (2) is set on the base plate (7). One of the parallel guide rails (2) is a scale guide rail (4). A guide rail slider is provided on the parallel guide rail (2). The detector bracket (8) is fixed to the guide rail slider. Its lower surface does not contact the upper surface of the base plate. It can slide along the direction of the parallel guide rail (2) based on the guide rail slider. The detector bracket (8) is used to support and fix the detector Dewar assembly (10) and to determine the orientation of the axis of the detector Dewar assembly (10). The first refrigeration unit bracket (3) and the second refrigeration unit bracket (12) are fixed on the base plate (7) based on the parallel guide rail (2). The first refrigeration unit bracket (3) and the second refrigeration unit bracket (12) cooperate to fix the refrigeration unit cold finger, so that the refrigeration unit cold finger and the detector cold finger maintain coaxiality. The scale guide rail (4) is also provided with a scale slider (6) to complete the reading based on the scale guide rail (4) and the scale slider (6); The scale slider (6) is also provided with a rotating gauge (11), one end of which is located close to the detector Dewar assembly (10), and the rotating gauge (11) can rotate freely.

2. The coupling device between the linear split-type Stirling refrigerator and the infrared detector as described in claim 1, characterized in that, The detector bracket (8) has a waist-shaped hole on its lower end face to fix it to the base plate (7) based on the waist-shaped hole, and to make the detector bracket (8) have a deviation margin in the direction of the base plate (7) plane perpendicular to the parallel guide rail (2).

3. The coupling device between the linear split Stirling refrigerator and the infrared detector as described in claim 1, characterized in that, The detector bracket (8) is also provided with a positioning pin (9) on one side. The positioning pin (9) is used to prevent the detector bracket from sliding off the track during the sliding process and to fix the position of the Dewar when measuring the Dewar depth.

4. The coupling device between the linear split-type Stirling refrigerator and the infrared detector as described in claim 1, characterized in that, The first refrigerator bracket (3) cooperates with the second refrigerator bracket (12) to ensure that the refrigerator cold finger and the detector cold finger maintain coaxiality in two directions perpendicular to the parallel guide rail (2).

Images