CN217520599U - Dewar cold finger of reinforced infrared detector - Google Patents
Dewar cold finger of reinforced infrared detector Download PDFInfo
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- CN217520599U CN217520599U CN202221149175.5U CN202221149175U CN217520599U CN 217520599 U CN217520599 U CN 217520599U CN 202221149175 U CN202221149175 U CN 202221149175U CN 217520599 U CN217520599 U CN 217520599U
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Abstract
The utility model discloses a reinforcement type infrared detector dewar cold finger, include: the cold finger cylinder is provided with a cold platform connecting part, a thin-wall part and a base connecting part which are sequentially connected, wherein the base connecting part is provided with a guide hole, and the wall thickness of the cold platform connecting part and the wall thickness of the base connecting part are both greater than that of the thin-wall part; the cold table is at least provided with a cold table convex part which is inserted into the cold table connecting part of the cold finger cylinder; the cold finger base at least comprises a cold finger base upper surface and a cylinder guide shaft, the cylinder guide shaft is inserted into the guide hole of the base connecting part, the upper end of the cylinder guide shaft is abutted against the upper bottom surface of the guide hole, and a gap is formed between the lower end of the base connecting part and the cold finger base upper surface. The utility model discloses a cold cylinder structure that indicates divide into cold platform connecting portion, thin wall portion and pedestal connection portion three-section, and cold both ends are all thickened about indicating the cylinder, can strengthen mechanical strength, guarantee the welding precision, avoid welding defect and reduce the machining degree of difficulty.
Description
Technical Field
The utility model relates to an infrared detector's technical field especially relates to a reinforcement type infrared detector dewar cold finger.
Background
The Dewar component is one of important components of the infrared detector, is used for packaging an infrared chip and provides a deep low-temperature and high-vacuum working environment for the chip. The Dewar cold finger is a core component of the Dewar assembly and is in sealed connection with the refrigerator, and when the refrigerator is used for refrigerating, high-pressure gas needs to be filled into the connection position of the Dewar cold finger and performs reciprocating motion, so that the Dewar cold finger needs good air tightness and high precision to ensure good matching with the refrigerator.
When the infrared detector works, the refrigerating machine firstly generates refrigerating capacity, the refrigerating capacity is transmitted to the Dewar cold finger, and then the refrigerating capacity is transmitted to the infrared chip through the cold head structure of the Dewar cold finger. In the process of refrigerating capacity transmission, refrigerating capacity loss is inevitably generated, the loss quantity is closely related to the wall thickness of the cold finger cylinder, and the thicker the wall of the cold finger cylinder, the more loss is generated. Therefore, the reduction of the wall thickness of the cold finger is an important measure for improving the rapid refrigerating capacity of the infrared detector. And the wall thickness is reduced, the mechanical property of the part is correspondingly deteriorated, and the part is easier to deform, so that the machining difficulty and the welding difficulty are increased. Meanwhile, the air tightness and the coaxial precision of the Dewar cold finger are directly influenced by different welding structure designs and welding methods. Therefore, the optimization of the cold finger structure and the welding mode is the key of the manufacture of the Dewar cold finger.
Generally, a cold finger structure and corresponding package structure includes: the cold finger base is provided with a cold finger cylinder guide hole, a positioning hole and a solder groove, the cold finger cylinder is of a thin-wall straight cylinder structure, and the cold platform is of a step structure and is provided with the solder groove. During installation, one end of the cold finger cylinder is inserted into the cold finger base, and the solder is installed in a solder groove of the cold finger base; and the cold stage is inserted into the cold finger cylinder, the solder is fixed on a solder groove of the cold stage in advance, and finally the welding is carried out by adopting a high-temperature vacuum brazing mode.
However, the existing cold finger cylinder is of a thin-wall straight cylinder structure, the high-temperature vacuum brazing process is easy to deform, and the coaxiality of the cold finger cylinder and the cold finger base is difficult to guarantee; the welding positions of the cold finger cylinder, the cold finger base and the cold platform are easy to generate corrosion during high-temperature vacuum brazing, so that the strength of a welding seam is reduced and the sealing performance is reduced; the cold finger cylinder thin-wall straight cylinder structure (the wall thickness is only 0.05-0.2 mm), the machining difficulty is high, and the machining is easy to deform.
On the other hand, in order to meet the requirement of vacuum brazing, a welding flux groove needs to be designed on a cold table or a cold finger base, and the processing difficulty is high.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a reinforcement type infrared detector dewar cold finger.
In order to realize the purpose, the utility model discloses the technical scheme who takes does:
a dewar cold finger of reinforced infrared detector, comprising:
the cold finger cylinder is of a tubular structure and is provided with a cold platform connecting part, a thin wall part and a base connecting part which are sequentially connected, wherein the base connecting part is provided with a guide hole, and the wall thickness of the cold platform connecting part and the wall thickness of the base connecting part are both greater than that of the thin wall part;
the cold table is at least provided with a cold table protruding part which is inserted into the cold table connecting part of the cold finger cylinder;
the cold finger base at least comprises a cold finger base upper surface and a cylinder guide shaft, the cylinder guide shaft is inserted into the guide hole of the base connecting part, the upper end of the cylinder guide shaft is abutted against the upper bottom surface of the guide hole, and a gap is formed between the lower end of the base connecting part and the cold finger base upper surface.
In the dewar cold finger of the reinforced infrared detector, a first solder fixing position is formed between the inner edge of the lower end of the base connecting part and the outer surface of the cylinder guide shaft;
and/or a second solder fixing position is formed between the inner surface of the guide hole of the base connecting part and the outer edge of the upper end of the cylinder guide shaft.
In the dewar cold finger of the reinforced infrared detector, the length of the cold stage connecting portion in the axial direction of the cold finger cylinder is greater than the length of the cold stage protruding portion in the axial direction of the cold finger cylinder.
The dewar cold finger of the reinforced infrared detector is characterized in that the cold stage comprises a plate-shaped structure and a cold stage protruding part connected with the plate-shaped structure, wherein the upper end of the cold stage connecting part is abutted against the plate-shaped structure, and the inner diameter of the cold stage connecting part is matched with the outer diameter of the cold stage protruding part.
In the dewar-type cold finger of the reinforced infrared detector, the outer diameter of the plate-shaped structure is greater than or equal to the outer diameter of the cold stage connecting part.
In the dewar cold finger of the reinforced infrared detector, a third welding seam position is formed between the lower surface of the plate-shaped structure and the upper end of the cold stage connecting part;
and/or a fourth solder fixing position is formed between the outer edge of the lower end of the cold stage protruding part and the inner surface of the cold stage connecting part.
In the dewar cold finger of the reinforced infrared detector, the end surface of the cold stage connecting part close to one side of the cold stage is a plane, and the surface of the cold stage connecting part far away from one side of the cold stage is an inclined plane or an arc surface.
In the dewar cold finger of the reinforced infrared detector, a length of the guide hole in an axial direction of the cold finger cylinder is smaller than a length of the base connecting portion in the axial direction of the cold finger cylinder, and an inner diameter of the guide hole is larger than an inner diameter of the thin-walled portion to form the upper bottom surface.
In the aforementioned reinforced infrared detector dewar cold finger, the end surface of the base connecting portion on the side close to the cold finger base is a plane, and the surface of the base connecting portion on the side far away from the cold finger base is an inclined plane or an arc surface.
In the dewar cold finger of the reinforced infrared detector, the inner diameter of the cold stage connecting portion, the inner diameter of the thin wall portion, and the inner diameter of the cylinder guide shaft are the same.
The utility model discloses owing to adopted above-mentioned technique, make it compare the positive effect that has with prior art and be:
(1) the utility model discloses a cold cylinder structure that indicates divide into cold platform connecting portion, thin wall portion and pedestal connection portion three-section, and cold both ends are all thickened about indicating the cylinder, can strengthen mechanical strength, guarantee the welding precision, avoid welding defect and reduce the machining degree of difficulty.
(2) The utility model discloses a cold platform structure adopts solid stair structure, need not cold bench design solder groove again, and its processing degree of difficulty is littleer.
(3) Compared with the prior art, the utility model discloses a two welding seams available welding mode is more, can adopt high energy beam welding (laser beam welding, electron beam welding) or vacuum brazing.
(4) Compared with the prior art, when the vacuum brazing mode is adopted for welding, the upper end and the lower end of the cold finger cylinder are thickened, a thin-wall structure at the welding position is avoided, and the corrosion phenomenon can be avoided.
(5) Compared with the prior art, the installation structure that the cold finger base is inserted into the cold finger cylinder can more easily ensure the coaxiality of the cold finger cylinder and the cold finger base after welding.
Drawings
Fig. 1 is a schematic view of a first embodiment of a dewar cold finger of the reinforced infrared detector of the present invention.
Fig. 2 is a schematic diagram of a second embodiment of the dewar cold finger of the reinforced infrared detector of the present invention.
In the drawings: 1. a cold finger cylinder; 11. a cold stage connection portion; 12. a thin-walled portion; 13. a base connection portion; 14. A guide hole; 2. cooling; 21. a cold stage raised portion; 22. a plate-like structure; 3. a cold finger base; 31. the upper surface of the cold finger base; 32. a cylinder guide shaft; 41. a first solder-securing location; 42. a second solder-securing location; 43. a third weld location; 44. a fourth solder securing location.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "horizontal", "vertical", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or original document indicated must have a specific position, and therefore, should not be construed as limiting the present invention.
It should be noted that "horizontal" and "vertical" in the present invention are used to describe general positional relationships, and are not strictly "horizontal" or "vertical".
It should be noted that the present invention may be used at an angle shown in the drawings or at an angle other than the drawings unless otherwise specified.
Fig. 1 is the schematic diagram of the first embodiment of the reinforced infrared detector dewar cold finger of the present invention, fig. 2 is the schematic diagram of the second embodiment of the reinforced infrared detector dewar cold finger of the present invention, please refer to fig. 1 to fig. 2, which show a reinforced infrared detector dewar cold finger of the preferred embodiment, including: the cold finger cylinder 1 is of a tubular structure, the cold finger cylinder 1 is provided with a cold platform connecting portion 11, a thin-wall portion 12 and a base connecting portion 13 which are sequentially connected, wherein the base connecting portion 13 is provided with a guide hole 14, and the wall thickness of the cold platform connecting portion 11 and the wall thickness of the base connecting portion 13 are both larger than that of the thin-wall portion 12.
Further, as a preferred embodiment, the dewar-type cold finger of the ruggedized infrared detector further comprises: the cold stage 2, the cold stage 2 has at least one cold stage lug boss 21, the cold stage lug boss 21 inserts into the cold stage connecting portion 11 of the cold finger cylinder 1.
Further, as a preferred embodiment, the dewar-type cold finger of the ruggedized infrared detector further comprises: the cold finger base 3, the cold finger base 3 has a cold finger base upper surface 31 and a cylinder guide shaft 32 at least, the cylinder guide shaft 32 is inserted into the guide hole 14 of the base connecting portion 13, the upper end of the cylinder guide shaft 32 is abutted against the upper bottom surface of the guide hole 14, there is a gap between the lower end of the base connecting portion 13 and the cold finger base upper surface 31.
Preferably, the upper end of the cylinder guide shaft 32 and the upper bottom surface of the guide shaft 14 each form a positioning surface.
Further, as a preferred embodiment, a first solder fixing position 41 is formed between an inner edge of the lower end of the base connecting portion 13 and an outer surface of the cylinder guide shaft 32.
Specifically, the inner edge of the lower end of the base connecting portion 13 has a chamfer forming a solder groove with the outer surface of the cylinder guide shaft 32. Preferably, the solder groove may be an annular groove with a triangular cross-section, although the cross-section of the solder groove may have other shapes. The solder bath is the first solder fixing location 41.
Further, as a preferred embodiment, a second solder fixing position 42 is formed between the inner surface of the guide hole 14 of the base connecting portion 13 and the outer edge of the upper end of the cylinder guide shaft 32.
Specifically, the upper end of the cylinder guide shaft 32 has a chamfer forming a solder groove with the inner wall of the guide hole 131 of the base attachment portion 13. Preferably, the solder groove may be an annular groove with a triangular cross-section, although the cross-section of the solder groove may have other shapes. The solder bath is the second solder attachment location 42.
Further, as a preferred embodiment, the length of the cold stage connecting portion 11 in the axial direction of the cold finger cylinder 1 is larger than the length of the cold stage protruding portion 21 in the axial direction of the cold finger cylinder 1.
Further, as a preferred embodiment, the cold stage 2 includes a plate-shaped structure 22 and a cold stage protruding portion 21 connected to the plate-shaped structure, wherein the upper end of the cold stage connecting portion 11 abuts against the plate-shaped structure 22, and the inner diameter of the cold stage connecting portion 11 matches with the outer diameter of the cold stage protruding portion 21.
Further, as a preferred embodiment, the outer diameter of the plate-like structure 22 is greater than or equal to the outer diameter of the cold stage connecting portion 11.
Preferably, the outer diameter of the plate-like structure 22 is larger than the outer diameter of the cold stage connection portion 11 to provide a larger plane for packaging the chip. Preferably, the outer diameter of the plate-like structure 22 is equal to the outer diameter of the cold stage connecting portion 11 to provide better stability.
Further, as a preferred embodiment, a third weld location 43 is formed between the lower surface of the plate-like structure 22 and the upper end of the cold stage connection 11.
Further, as a preferred embodiment, a fourth solder fixing location 44 is formed between the outer edge of the lower end of the cold plate protrusion and the inner surface of the cold plate connection.
Further, as a preferred embodiment, third weld location 43 is a high energy beam weld location.
Further, as a preferred embodiment, the fourth solder attachment location 44 provides a solder attachment location for vacuum brazing.
Preferably, the lower end of the cold stage protruding portion 21 has a chamfer, and a solder groove is formed between the chamfer and the inner wall of the cold stage connecting portion 11. The solder bath is the fourth solder attachment location 44.
The above description is only an example of the preferred embodiments of the present invention, and the embodiments and the protection scope of the present invention are not limited thereby.
The utility model discloses still have following embodiment on above-mentioned basis:
the utility model discloses a further embodiment, the terminal surface that cold platform connecting portion 11 is close to one side of cold platform 2 is the plane, and the surface that cold platform connecting portion 11 kept away from one side of cold platform 2 is inclined plane or cambered surface.
In a further embodiment of the present invention, the length of the guide hole 14 in the axial direction of the cold finger cylinder 1 is smaller than the length of the pedestal connection portion 13 in the axial direction of the cold finger cylinder 1, and the inner diameter of the guide hole 14 is larger than the inner diameter of the thin-walled portion 12 to form the upper bottom surface of the guide hole 14.
The utility model discloses a further embodiment, the terminal surface that base connecting portion 13 is close to one side of cold finger base 1 is the plane, and the surface that base connecting portion 13 kept away from one side of cold finger base 1 is inclined plane or cambered surface.
In a further embodiment of the present invention, the inner diameter of the cold stage connecting portion 11, the inner diameter of the thin wall portion 12, and the inner diameter of the cylinder guide shaft 32 are the same.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a reinforcement type infrared detector dewar cold finger which characterized in that includes:
the cold finger cylinder is of a tubular structure and is provided with a cold platform connecting part, a thin wall part and a base connecting part which are sequentially connected, wherein the base connecting part is provided with a guide hole, and the wall thickness of the cold platform connecting part and the wall thickness of the base connecting part are both greater than that of the thin wall part;
the cold table is at least provided with a cold table protruding part which is inserted into the cold table connecting part of the cold finger cylinder;
the cold finger base at least comprises a cold finger base upper surface and a cylinder guide shaft, the cylinder guide shaft is inserted into the guide hole of the base connecting part, the upper end of the cylinder guide shaft supports against the upper bottom surface of the guide hole, and a gap is formed between the lower end of the base connecting part and the cold finger base upper surface.
2. The infrared detector dewar cold finger of claim 1, wherein a first solder fixing position is formed between an inner edge of a lower end of the base connecting portion and an outer surface of the cylinder guide shaft;
and/or a second solder fixing position is formed between the inner surface of the guide hole of the base connecting part and the outer edge of the upper end of the cylinder guide shaft.
3. The dewar-type cold finger of the infrared detector of claim 1, wherein a length of the cold stage connecting portion in an axial direction of the cold finger cylinder is larger than a length of the cold stage protruding portion in the axial direction of the cold finger cylinder.
4. The dewar cold finger of the reinforced infrared detector of claim 1, wherein the cold stage comprises a plate structure and a cold stage protruding portion connected with the plate structure, wherein an upper end of the cold stage connecting portion abuts against the plate structure, and an inner diameter of the cold stage connecting portion matches with an outer diameter of the cold stage protruding portion.
5. The infrared detector dewar cold finger of claim 4, wherein an outer diameter of the plate-like structure is greater than or equal to an outer diameter of the cold stage connection portion.
6. The dewar cold finger of the reinforced infrared detector of claim 5, wherein a third welding seam position is formed between the lower surface of the plate-like structure and the upper end of the cold stage connecting portion;
and/or a fourth solder fixing position is formed between the outer edge of the lower end of the cold stage protruding part and the inner surface of the cold stage connecting part.
7. The dewar cold finger of the reinforced infrared detector of claim 1, wherein an end surface of a side of the cold stage connecting portion close to the cold stage is a plane, and a surface of a side of the cold stage connecting portion away from the cold stage is an inclined surface or an arc surface.
8. The infrared detector dewar cold finger of claim 7, wherein a length of the guide hole in an axial direction of the cold finger cylinder is smaller than a length of the base connection portion in the axial direction of the cold finger cylinder, and an inner diameter of the guide hole is larger than an inner diameter of the thin wall portion to form the upper bottom surface.
9. The dewar cold finger of the reinforced infrared detector as claimed in claim 7, wherein an end surface of a side of the base connecting portion close to the base of the cold finger is a plane, and a surface of a side of the base connecting portion away from the base of the cold finger is an inclined surface or an arc surface.
10. The infrared detector dewar cold finger as claimed in claim 1, wherein an inner diameter of the cold stage connecting portion, an inner diameter of the thin wall portion, and an inner diameter of the cylinder guide shaft are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221149175.5U CN217520599U (en) | 2022-05-13 | 2022-05-13 | Dewar cold finger of reinforced infrared detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221149175.5U CN217520599U (en) | 2022-05-13 | 2022-05-13 | Dewar cold finger of reinforced infrared detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217520599U true CN217520599U (en) | 2022-09-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221149175.5U Active CN217520599U (en) | 2022-05-13 | 2022-05-13 | Dewar cold finger of reinforced infrared detector |
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| Country | Link |
|---|---|
| CN (1) | CN217520599U (en) |
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2022
- 2022-05-13 CN CN202221149175.5U patent/CN217520599U/en active Active
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