Cooling disc for enhancing heat transfer and detector

Abstract

The utility model belongs to the technical field of throttling refrigeration, and particularly provides an enhanced heat transfer cold disc which comprises a cold disc base, and a stagnation area is formed on the lower surface of the cold disc base. A plurality of grooves are formed in the stagnation area at intervals; a plurality of protrusions are arranged on the lower surface of the cooling disc base at intervals and located outside the stagnation area. By changing the structure of the cooling disc, the phenomenon that the heat transfer resistance is increased due to the fact that air films are formed in the tiny blind holes outside the center area of the cooling disc due to the fact that the flow rate of air is reduced is effectively avoided, the heat transfer process of jet airflow and the cooling disc is indirectly strengthened, and the cooling time of a refrigerating machine is shortened. In addition, the protrusions arranged in the non-stagnation area can enhance disturbance of jetted airflow on the surface of the cold disc, so that the heat transfer coefficient is increased, the heat transfer process is enhanced, and the cooling time of the refrigerator is further shortened. On the basis of not changing the main body structure of the existing refrigerator, the heat transfer process is enhanced, and the purpose of shortening the cooling time is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of throttling refrigeration, and in particular relates to a cold plate and a detector for enhancing heat transfer. Background Art

[0002] The open throttling cooler mainly includes a high-pressure gas cylinder, a fin tube, a mandrel, a throttling hole and connecting pipes. The fin tube is fixed on the mandrel by spiral winding. Generally, the working medium in the high-pressure gas cylinder flows through the fin tube and produces a temperature drop at the throttling hole. The low-temperature return gas working medium after throttling flows through the external fins of the fin tube, exchanges heat with the incoming high-pressure and high-temperature gas working medium in the fin tube, and is discharged to the environment. In this way, the high-temperature and high-pressure incoming gas working medium is continuously cooled by the low-temperature and low-pressure return gas working medium, so that the gas working medium can be throttled at a lower temperature and obtain a lower refrigeration temperature, until a part of the gas working medium is liquefied and reaches a gas-liquid two-phase equilibrium state. Throttling refrigeration detectors are widely used in air-to-air and air defense missiles due to their small size, short cooling time, and low electromagnetic interference. The new generation of air-to-air missiles has put forward more stringent requirements on the startup time, and it is necessary to further shorten the cooling time of the existing open throttling cooler.

[0003] Most of the existing open throttling refrigerator cold plates have many tiny countersunk holes machined on the sprayed surface. On the one hand, this can increase the heat exchange area for convective heat exchange; on the other hand, the tiny countersunk holes can effectively prevent the liquid film formed on the sprayed surface of the cold plate due to liquefaction, which leads to a significant increase in the heat transfer thermal resistance. In other words, the tiny countersunk holes can also reduce the heat transfer thermal resistance between the jet gas and the cold plate surface, thereby strengthening the heat transfer process and shortening the cooling time of the refrigerator. When the area of ​​the cold plate is comparable to the size of the jet stagnation radius of the throttling hole, machining tiny countersunk holes on the sprayed surface is beneficial to reducing the heat transfer thermal resistance between the jet gas and the cold plate surface, thereby strengthening the heat transfer process and shortening the cooling time of the refrigerator. However, if Figure 3 As shown in the figure, when the throttling aperture is small (small stagnation radius) and the cold plate diameter is relatively large, the tangential velocity and normal velocity of the airflow are relatively small in the area outside the stagnation zone, and it is easy to form gas or liquid mass deposition in the tiny countersunk hole. Whether gas or liquid is deposited in the tiny countersunk hole, it is bound to increase the heat transfer resistance between the jet airflow and the cold plate in the area, deteriorate the heat transfer process, and extend the cooling time of the refrigerator. Utility Model Content

[0004] The utility model aims to overcome the problem in the prior art that gas or liquid is deposited in tiny countersunk holes in an area outside the stagnation radius of the cold plate, increasing the heat transfer resistance between the jet airflow and the cold plate in the area, worsening the heat transfer process, and resulting in a prolonged cooling time of the refrigerator.

[0005] To this end, the utility model provides a cold plate with enhanced heat transfer, including a cold plate base, a stagnation zone formed on the lower surface of the cold plate base; a plurality of grooves are arranged at intervals in the stagnation zone; a plurality of protrusions are arranged at intervals on the lower surface of the cold plate base, and the protrusions are located outside the stagnation zone.

[0006] Specifically, the height of the protrusion is the same as the depth of the groove.

[0007] Specifically, the grooves are arranged in the stagnation zone to form a disc shape.

[0008] Specifically, the protrusions are arranged in a plurality of circular rings outside the stagnation zone.

[0009] Specifically, the groove is a countersunk hole, a strip groove or an annular groove; and / or the protrusion is a rib or a strip convex edge.

[0010] Specifically, the cold plate further comprises an annular flange connected to the lower surface of the cold plate base.

[0011] The utility model also provides a throttling refrigerator, comprising the above-mentioned cold plate with enhanced heat transfer.

[0012] Specifically, the throttling refrigerator further comprises a cold finger cylinder; the cold plate is arranged on the cold finger cylinder, and the lower surface of the cold plate is connected to the cold finger cylinder.

[0013] Specifically, the throttling refrigerator further comprises a chip; the chip is connected to the upper surface of the cold plate.

[0014] Specifically, the throttling refrigerator further includes a cold shield; the cold shield is connected to the upper surface of the cold plate; and the chip is located in the cold shield.

[0015] The utility model also provides a detector, comprising the above-mentioned throttling refrigerator.

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

[0017] The heat transfer enhanced cold plate provided by the utility model effectively avoids the phenomenon that the heat transfer resistance is increased due to the formation of an air film in the tiny blind holes due to the reduction of gas flow rate outside the central area of ​​the cold plate (within the jet stagnation radius) by changing the cold plate structure, thereby indirectly enhancing the heat transfer process between the jet airflow and the cold plate and shortening the cooling time of the refrigerator. In addition, the tiny protrusions set in the non-stagnation area can also enhance the disturbance of the airflow on the surface of the cold plate after the injection, thereby increasing the heat transfer coefficient, enhancing the heat transfer process, and further shortening the cooling time of the refrigerator. On the basis of not changing the main structure of the existing refrigerator, the heat transfer process is enhanced to achieve the purpose of shortening the cooling time.

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

[0019] Figure 1 It is a front view of the cold plate structure with enhanced heat transfer provided by the utility model.

[0020] Figure 2 It is a cross-sectional view of the cold plate structure with enhanced heat transfer provided by the utility model.

[0021] Figure 3 It is a schematic diagram of heat exchange between an existing cold plate and a jet airflow.

[0022] Figure 4 The utility model is a schematic diagram of heat exchange between a cold plate and a jet airflow for enhanced heat transfer.

[0023] Figure 5 It is a partial cross-sectional view of the throttling refrigeration detector provided by the utility model.

[0024] Explanation of the reference numerals: 1. cold plate; 101. cold plate base; 102. groove; 103. protrusion; 104. annular flange; 2. chip; 3. cold shield; 4. cold finger cylinder; 5. refrigerator housing; 6. air mass. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] 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", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] Reference Figure 1-2The utility model provides a cold plate with enhanced heat transfer, comprising a cold plate base 101, wherein a stagnation zone is formed on the lower surface of the cold plate base 101; a plurality of grooves 102 are arranged at intervals in the stagnation zone; a plurality of protrusions 103 are arranged at intervals on the lower surface of the cold plate base 101, and the protrusions 103 are located outside the stagnation zone. The grooves 102 can be designed as countersunk holes, strip grooves or annular grooves as required; the protrusions 103 are designed as convex ribs, strip convex ridges or annular convex ridges, preferably convex ribs with the same height as the depth of the grooves 102.

[0028] In actual use, the gas ejected from the throttle hole will form a stagnation zone at the cold plate base 101. The tiny grooves 102 in the stagnation zone can significantly increase the heat transfer area and shorten the cooling time of the detector. In addition, the airflow velocity in each direction in the stagnation zone is relatively large and exhibits an extremely irregular turbulent state. Therefore, it is not easy for gas masses 6 or liquid masses to deposit in the grooves 102 within the stagnation zone. Figure 4 As shown, a protrusion 103 is provided on the surface of the cold plate 1 outside the stagnation zone, and its own structure determines that the airflow will not form an air mass 6 or a liquid mass deposition there, and will not increase the heat transfer resistance. On the other hand, the structure of the protrusion 103 can also increase the airflow disturbance in the area outside the stagnation zone, increase the convection heat transfer coefficient, and enhance the heat transfer process.

[0029] Furthermore, the cold plate 1 is usually in the shape of a disk, and the grooves 102 are preferably arranged in the stagnation zone to form a disk shape, with a certain interval between adjacent grooves 102. The grooves 102 can also be arranged in other shapes according to the actual situation of the cold plate 1.

[0030] The protrusions 103 outside the stagnation zone are designed according to the arrangement of the grooves 102. When the grooves 102 are arranged to form a disc shape, the protrusions 103 are preferably arranged in sequence in a plurality of circular rings around the grooves 102, with a certain interval between the connected protrusions 103.

[0031] Specifically, when the groove 102 is designed as a strip-shaped groove, the strip-shaped grooves can be evenly arranged in the radial direction; when the groove 102 is designed as an annular groove, the annular groove can be arranged in multiple circles along the circumferential direction.

[0032] When the protrusion 103 is designed as a strip-shaped ridge, the strip-shaped ridge can be evenly arranged in the radial direction; when the protrusion 103 is designed as an annular ridge, the annular ridge is arranged in multiple circles along the circumferential direction.

[0033] Furthermore, the cold plate 1 further comprises an annular flange 104 connected to the lower surface of the cold plate base 101, and the annular flange 104 is used to connect with the cold finger cylinder 4 below the cold plate 1. In a detailed embodiment, the protrusion 103 and the groove 102 structure are located in the area enclosed by the annular flange 104.

[0034] The utility model also provides a detector including the above-mentioned enhanced heat transfer cold plate 1. On the basis of not changing the main structure of the existing detector, by changing the structure of the cold plate 1, the heat transfer process is enhanced, thereby achieving the purpose of shortening the cooling time, enriching the applicable scenarios of the detector, and being able to be applied to a wider range of scenarios.

[0035] Specifically, the detector also includes a cold finger cylinder 4; the cold plate 1 is arranged on the cold finger cylinder 4, and the lower surface of the cold plate 1 receiving the cold is connected to the cold finger cylinder 4, blocking the top opening of the cold finger cylinder 4, and transmitting the cold generated by the refrigerator.

[0036] Furthermore, the detector further comprises a chip 2 ; the chip 2 is connected to the upper surface of the cold plate 1 .

[0037] In a detailed implementation, the detector further includes a cold shield 3 ; the cold shield 3 is connected to the upper surface of the cold plate 1 ; and the chip 2 is located inside the cold shield 3 .

[0038] Specifically, the bottom end of the cold shield 3 extends outward to form an annular wing plate; the wing plate is connected and fixed to the upper surface of the cold plate 1, and the chip 2 and the upper surface of the cold plate 1 are wrapped in the cold shield 3.

[0039] Furthermore, the detector further comprises a refrigerator housing 5 , and the cold finger cylinder 4 , the cold plate 1 , and the cold shield 3 are all arranged inside the refrigerator housing 5 .

[0040] In summary, the heat transfer-enhanced cold plate 1 provided by the utility model effectively avoids the phenomenon that the heat transfer resistance is increased by forming an air film in the tiny blind holes due to the reduction of the gas flow rate outside the central area of ​​the cold plate 1 (within the jet stagnation radius) by changing the structure of the cold plate 1, thereby indirectly enhancing the heat transfer process between the jet airflow and the cold plate 1 and shortening the cooling time of the refrigerator. In addition, the tiny protrusions 103 provided in the non-stagnation area can also enhance the disturbance of the airflow after injection on the surface of the cold plate 1, thereby increasing the heat transfer coefficient, enhancing the heat transfer process, and further shortening the cooling time of the refrigerator. On the basis of not changing the main structure of the existing refrigerator, the heat transfer process is enhanced to achieve the purpose of shortening the cooling time.

[0041] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A cold plate with enhanced heat transfer, comprising a cold plate base (101), characterized in that: A stagnation zone is formed on the lower surface of the cold plate base (101); a plurality of grooves (102) are arranged at intervals in the stagnation zone; a plurality of protrusions (103) are arranged at intervals on the lower surface of the cold plate base (101), and the protrusions (103) are located outside the stagnation zone.

2. The cold plate with enhanced heat transfer as claimed in claim 1, characterized in that: The height of the protrusion (103) is the same as the depth of the groove (102).

3. The cold plate with enhanced heat transfer as claimed in claim 1, characterized in that: The grooves (102) are arranged to form a disc shape.

4. The cold plate with enhanced heat transfer as claimed in claim 1, characterized in that: The protrusions (103) are arranged in a plurality of circular rings outside the stagnation zone.

5. The cold plate with enhanced heat transfer as claimed in claim 1, characterized in that: The groove (102) is a countersunk hole, a strip-shaped groove or an annular groove; And / or, the protrusion (103) is a convex rib, a strip-shaped convex ridge or an annular convex ridge.

6. The cold plate with enhanced heat transfer as claimed in claim 1, characterized in that: It also includes an annular flange (104) connected to the lower surface of the cold plate base (101).

7. A detector, characterized in that: The invention comprises a cold plate (1) with enhanced heat transfer as claimed in any one of claims 1 to 6.

8. The detector according to claim 7, characterized in that: It also comprises a cold finger cylinder (4); the cold plate (1) is arranged on the cold finger cylinder (4), and the lower surface of the cold plate (1) is connected to the cold finger cylinder (4).

9. The detector according to claim 7, characterized in that: It also comprises a chip (2); the chip (2) is connected to the upper surface of the cold plate (1).

10. The detector according to claim 9, characterized in that: It also comprises a cold shield (3); the cold shield (3) is connected to the upper surface of the cold plate (1); and the chip (2) is located inside the cold shield (3).

Images