Long cold accumulation throttling refrigerator and infrared detector

Abstract

The utility model belongs to the technical field of throttling refrigerators, and particularly provides a long cold accumulation throttling refrigerator and an infrared detector, the long cold accumulation throttling refrigerator comprises a cold finger cylinder and a bottom flange; the cold finger cylinder is mounted on the bottom flange; the bottom flange is provided with a plurality of fixing parts used for being fixed to a cold finger air cylinder. The area, located between every two adjacent fixing parts, of the bottom flange is a backflow outlet area. A part of the backflow outlet area is provided with a backflow outlet communicating the interior of the cold finger air cylinder with the outside. The backflow outlets for communicating the interior of the cold finger air cylinder with the outside are only formed in part of the backflow outlet areas, the size of the total cross section of the backflow outlets is changed, and existing backflow outlets formed in all the backflow outlet areas are changed into backflow outlets formed in part of the backflow outlet areas and communicated with the outside atmosphere. According to the structure that part of the backflow outlet area makes contact with the plane of the cold finger air cylinder, the size of the gap between the cold finger air cylinder and the bottom flange is changed, the aim of prolonging the residence time of backflow gas is achieved on the premise that the cooling time is not affected, and the cold storage capacity of the refrigerator is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of throttling refrigerators, and in particular relates to a long cold storage throttling refrigerator and an infrared detector. Background Art

[0002] Infrared detectors are widely used in civilian and military applications, including thermal imagers, infrared forward and night vision systems, missile guidance, and space applications. Dewar components provide a low-temperature, vacuum operating environment for infrared detectors and are crucial components. Throttling coolers, with their compact structure, small size, light weight, and fast startup, are widely used in infrared systems.

[0003] For throttling coolers requiring long cold storage, under specific air source conditions, increasing cold storage time primarily relies on reducing the orifice diameter. However, reducing the orifice diameter negatively impacts the cooling time and makes the cooler more susceptible to orifice clogging. This necessitates higher cleanliness requirements for the manufacturing process, ensuring adequate cleanliness at all stages of the cooler, from parts and components to the entire unit. This undoubtedly increases production costs. Utility Model Content

[0004] The purpose of the utility model is to overcome the problem that the existing structure of increasing the cold storage time of the throttling refrigerator has a negative impact on the cooling time and increases the production cost.

[0005] To this end, the utility model provides a long cold storage throttling refrigerator, including a cold finger cylinder and a bottom flange; the cold finger cylinder is installed on the bottom flange; the bottom flange is provided with a plurality of fixing parts for fixing to the cold finger cylinder; the area between each adjacent two fixing parts on the bottom flange is a reflux outlet area; part of the reflux outlet area is provided with a reflux outlet connecting the inside of the cold finger cylinder with the outside world.

[0006] Specifically, a reflux groove is provided in the above-mentioned part of the reflux outlet area to form the reflux outlet, and a sealing member is provided between the reflux outlet area without the reflux groove and the bottom flange.

[0007] Specifically, the sealing member includes a sealing strip; a sealing groove is provided in the reflux outlet area where no reflux groove is provided; and the sealing strip is arranged in the sealing groove.

[0008] Specifically, the sealing strip is a rubber sealing strip, a metal sealing strip, or a PCTFE sealing strip.

[0009] Specifically, all the above-mentioned reflux outlet areas are provided with reflux grooves; some of the reflux grooves are filled with filling pieces for closing the reflux grooves, and the reflux grooves not filled with the filling pieces form the reflux outlets.

[0010] Specifically, the long cold storage throttling refrigerator further includes a heat exchange component; the heat exchange component is mounted on the bottom flange and is located in the cold finger cylinder.

[0011] Specifically, the above-mentioned heat exchange component includes a core shaft and a fin tube; the core shaft is installed on the bottom flange; the fin tube is wound on the core shaft; the gap between the cold finger cylinder, the fin tube and the core shaft forms a reflux channel; the reflux channel is connected to the reflux groove.

[0012] Specifically, the bottom flange is provided with an air inlet; the air inlet is communicated with the fin tube inlet.

[0013] Specifically, a cold plate is installed on the cold finger cylinder; and throttling holes are opened at positions corresponding to the finned tube and the cold plate.

[0014] The utility model also provides an infrared detector, which comprises the long cold storage throttling refrigerator.

[0015] Specifically, the infrared detector further includes a dewar; the long cold storage throttling cooler is coupled to the dewar, and the long cold storage throttling cooler is arranged in the dewar.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] The long cold storage throttling refrigerator provided by the utility model, without changing the throttling aperture and gas source conditions, changes the total cross-sectional size of the reflux outlet by setting a reflux outlet connecting the inside of the cold finger cylinder with the outside world only in part of the reflux outlet area, and changes the existing all reflux outlet areas with reflux outlets to a structure in which reflux outlets are set in part of the reflux outlet areas and are connected to the outside atmosphere, and the structure in which part of the reflux outlet area is in plane contact with the cold finger cylinder, changes the size of the gap between the cold finger cylinder and the bottom flange, and achieves the purpose of extending the residence time of the reflux gas in the expansion chamber and the reflux channel of the refrigerator without affecting the cooling time, thereby improving the cold storage capacity of the refrigerator, and has the advantages of simple structure, significant effect, and strong operability.

[0018] The present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of a long cold storage throttling refrigerator in an embodiment provided by the utility model.

[0020] Figure 2 yes Figure 1 Enlarged view of part A.

[0021] Figure 3 yes Figure 1 Enlarged view of part B.

[0022] Figure 4 It is a cross-sectional view of a long cold storage throttling refrigerator in another embodiment provided by the utility model.

[0023] Figure 5 yes Figure 4 Enlarged view of part C in the middle.

[0024] Figure 6 This is a schematic diagram of the bottom flange structure with a sealing groove provided by the utility model.

[0025] Explanation of the reference numerals: 1. bottom flange; 101. reflux groove; 102. sealing groove; 103. air inlet; 2. cold finger cylinder; 3. sealing strip; 4. core shaft; 5. fin tube; 6. reflux channel; 7. cold plate. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0028] Reference Figure 1-3The present invention provides a long-storage cold storage throttling refrigerator, comprising a cold finger cylinder 2 and a bottom flange 1; the cold finger cylinder 2 is mounted on the bottom flange 1; the bottom flange 1 is provided with a plurality of fixing portions for fixing with the cold finger cylinder 2; the area between each two adjacent fixing portions on the bottom flange 1 is a reflux outlet area; part of the reflux outlet area is provided with a reflux outlet connecting the inside of the cold finger cylinder 2 with the outside. The reflux sealing structure of the bottom flange 1 and the cold finger cylinder 2 of the long-storage cold storage throttling refrigerator, without changing the throttling aperture and gas source conditions, replaces the previous practice of providing a reflux outlet structure in all reflux outlet areas by providing a reflux outlet connecting the inside of the cold finger cylinder 2 with the outside, thereby changing the total cross-sectional size of the reflux outlet. Without affecting the cooling time, the purpose of extending the residence time of the reflux gas in the expansion chamber and the reflux channel 6 of the refrigerator is achieved, thereby improving the cold storage capacity of the refrigerator.

[0029] In one embodiment, Figure 2-3 As shown, a portion of the reflux outlet area is provided with a reflux groove 101 to form the reflux outlet. A seal is provided between the reflux outlet area without the reflux groove 101 and the bottom flange 1. The connection area between the bottom flange 1 and the cold finger cylinder 2 is divided into two parts. One part is isolated by the reflux groove 101 to create a gap for the reflux fluid to flow into the outside atmosphere. The other part of the reflux outlet area is tightly fitted with the bottom of the cold finger cylinder 2, changing the size of the gap between the cold finger cylinder 2 and the bottom flange 1 and extending the residence time of the reflux gas in the refrigerator expansion chamber and reflux channel 6. The size and number of the reflux grooves 101 are designed according to the actual needs of the throttling refrigerator.

[0030] In the above embodiment, if Figure 4-6 A seal is provided at the part where the bottom flange 1 and the cold finger cylinder 2 are in close contact, to prevent the reflux gas from overflowing from the reflux outlet area where the reflux groove 101 is not opened.

[0031] Specifically, the sealing member includes a sealing strip 3; Figure 1 As shown, a sealing groove 102 is provided in the reflux outlet area where the reflux groove 101 is not provided; the sealing strip 3 is arranged in the sealing groove 102. The sealing strip 3 can be made of rubber sealing strip 3, metal sealing strip 3, PCTFE sealing strip 3 or other suitable materials as needed.

[0032] In another embodiment, all reflux outlet regions are provided with reflux grooves 101, and some reflux grooves 101 are filled with a filler to seal the reflux grooves 101. The filler can be a sealing block, sealant, or other filling material. The reflux grooves 101 not filled with the filler form reflux outlets for connecting the interior of the cold finger cylinder 2 with the outside world.

[0033] Furthermore, the long cold storage throttling refrigerator also includes a heat exchange component; the heat exchange component is installed on the bottom flange 1 and is located in the cold finger cylinder 2.

[0034] In a detailed embodiment, the heat exchange assembly includes a core shaft 4 and finned tubes 5; the core shaft 4 is mounted on the bottom flange 1; the finned tubes 5 are wound around the core shaft 4, preferably helically wound around the outer surface of the core shaft 4; the gap between the cold finger cylinder 2, the finned tubes 5, and the core shaft 4 forms a return flow channel 6; the return flow channel 6 is connected to the return flow groove 101. Heat is exchanged within the cold finger cylinder 2 through the finned tubes 5.

[0035] Specifically, the bottom flange 1 is provided with an air inlet 103, which is connected to the inlet of the finned tube 5 and an external high-pressure gas source, respectively. The external high-pressure fluid is introduced into the throttling refrigerator through the air inlet 103.

[0036] Furthermore, a cold plate 7 is mounted on the cold finger cylinder 2; throttle holes are provided at locations corresponding to the finned tubes 5 and the cold plate 7, communicating with the return channel 6. Preferably, the cold plate 7 is mounted on the top of the cold finger cylinder 2, and the throttle holes are provided on the finned tubes 5 at the top of the core shaft 4. High-pressure fluid enters the finned tubes 5 through the air inlet 103, is throttled by the throttle holes, and then ejected, exchanging heat with the cold plate 7. After heat exchange, the return gas exchanges heat again with the finned tubes 5 in the return channel 6, and finally enters the atmosphere through the gap between the cold finger cylinder 2 and the return groove 101 of the bottom flange 1.

[0037] The utility model also provides an infrared detector, which comprises the long cold storage throttling refrigerator.

[0038] Furthermore, the infrared detector also includes a dewar; the long cold storage throttling refrigerator is coupled to the dewar, and the long cold storage throttling refrigerator is arranged in the dewar.

[0039] In order to improve the sealing performance of the infrared detector, a sealing ring is provided between the mating surface of the bottom flange 1 and the Dewar.

[0040] Example 1:

[0041] This embodiment provides a long cold storage throttling refrigerator, which includes a cold finger cylinder 2, a heat exchange component and a bottom flange 1.

[0042] Bottom flange 1 Figure 6 As shown, an air inlet 103 is provided at the center, passing through the bottom flange 1, and six reflux outlet areas are formed circumferentially on the upper surface, wherein each of the five reflux outlet areas is provided with a reflux groove 101, and one reflux outlet area is provided with a sealing groove 102, and a sealing strip 3 is provided in the sealing groove 102.

[0043] The heat exchange assembly includes a core shaft 4 and a finned tube 5. The core shaft 4 is installed on the bottom flange 1. The finned tube 5 is spirally wound on the outer surface of the core shaft 4. A throttling hole is opened on the finned tube 5 at the top of the core shaft 4, and the throttling hole diameter is 0.07 mm; the air inlet 103 is connected to the hollow interior of the core shaft 4 and the inlet of the finned tube 5.

[0044] The cold finger cylinder 2 is installed on the bottom flange 1, and a part of the reflux groove 101 is located inside the cold finger cylinder 2 and a part is located outside the cold finger cylinder 2, connecting the inside and outside of the cold finger cylinder 2, and the sealing strip 3 is in close contact with the bottom surface of the cold finger cylinder 2; the heat exchange component is located in the cold finger cylinder 2, and the gap between the cold finger cylinder 2, the fin tube 5 and the core shaft 4 forms a reflux channel 6, and the reflux groove 101 is connected to the reflux channel 6; a cold plate 7 is installed on the top of the cold finger cylinder.

[0045] The air inlet 103 is connected to the external high-pressure air source. The high-pressure fluid enters the fin tube 5 through the air inlet 103, and then is ejected after being throttled by the throttle hole to exchange heat with the cold plate 7. The reflux gas after heat exchange exchanges heat with the fin tube 5 again in the reflux channel 6, and finally enters the atmospheric environment through the gap between the cold finger cylinder 2 and the bottom flange 1, that is, the reflux groove 101.

[0046] Taking the gas source conditions of 300ml, 50MPa argon as an example, the original performance of the design of the utility model is 6.6s@100K and the cold storage is 8.3min. After applying the design of the utility model, the original performance is 6.5s@100K and the cold storage is 9.56min, and the cold storage time is increased by 15.6% compared with the original.

[0047] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. Any design that is identical or similar to the present invention falls within the scope of protection of the present invention.

Claims

1. A long cold storage throttling refrigerator, characterized in that: The invention comprises a cold finger cylinder (2) and a bottom flange (1); the cold finger cylinder (2) is mounted on the bottom flange (1); the bottom flange (1) is provided with a plurality of fixing portions for fixing to the cold finger cylinder (2); the area between each two adjacent fixing portions on the bottom flange (1) is a reflux outlet area; part of the reflux outlet area is provided with a reflux outlet connecting the interior of the cold finger cylinder (2) with the outside.

2. The long cold storage throttling refrigerator according to claim 1, characterized in that: A portion of the reflux outlet area is provided with a reflux groove (101) to form the reflux outlet, and a sealing member is provided between the reflux outlet area not provided with the reflux groove (101) and the bottom flange (1).

3. The long cold storage throttling refrigerator according to claim 2, characterized in that: The sealing member comprises a sealing strip (3); a sealing groove (102) is provided in a reflux outlet region where the reflux groove (101) is not provided; and the sealing strip (3) is arranged in the sealing groove (102).

4. The long cold storage throttling refrigerator according to claim 3, characterized in that: The sealing strip (3) is a rubber sealing strip, a metal sealing strip, or a PCTFE sealing strip.

5. The long cold storage throttling refrigerator according to claim 1, characterized in that: All reflux outlet areas are provided with reflux grooves (101); some of the reflux grooves (101) are filled with fillers for closing the reflux grooves (101), and the reflux grooves (101) not filled with the fillers form the reflux outlets.

6. The long cold storage throttling refrigerator according to claim 5, characterized in that: It also includes a heat exchange component; the heat exchange component is installed on the bottom flange (1) and is located in the cold finger cylinder (2).

7. The long cold storage throttling refrigerator according to claim 6, characterized in that: The heat exchange assembly comprises a core shaft (4) and a fin tube (5); the core shaft (4) is mounted on the bottom flange (1); the fin tube (5) is wound around the core shaft (4); a reflux channel (6) is formed by the gap between the cold finger cylinder (2), the fin tube (5) and the core shaft (4); and the reflux channel (6) is connected to the reflux groove (101).

8. The long cold storage throttling refrigerator according to claim 7, characterized in that: The bottom flange (1) is provided with an air inlet (103); the air inlet (103) is communicated with the inlet of the finned tube (5).

9. The long cold storage throttling refrigerator according to claim 7, characterized in that: A cold plate (7) is installed on the cold finger cylinder (2); and throttling holes are provided at positions corresponding to the finned tube (5) and the cold plate (7).

10. An infrared detector, characterized in that: The invention comprises the long cold storage throttling refrigerator according to any one of claims 1 to 9.

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