Anti-corrosion packaging structure of inorganic phase change material

Abstract

The utility model provides an anti-corrosion packaging structure of an inorganic phase-change material, which comprises a cover plate and a shell, a cavity for placing the inorganic phase-change material is arranged in the shell, an annular small rib is arranged on the outer side of one side of an opening of the cavity of the shell, one side of the cover plate is in contact with the shell to seal the cavity of the shell, and the other side of the cover plate is in contact with the shell. An annular small rib groove is formed in the side, close to the shell, of the cover plate, the small rib groove is buckled with the small rib, anti-corrosion coatings are arranged on the cavity wall of the shell and the side, close to the shell, of the cover plate, an annular sealing ring groove is further formed in the side, provided with an opening of the cavity, of the shell, a sealing ring is arranged in the sealing ring groove, and the sealing ring groove is formed in the inner side of the small rib. The problem that the packaging container is corroded by inorganic materials is solved.

Description

Technical Field

[0001] This utility model relates to the field of inorganic phase change cold plates, and in particular to an anti-corrosion packaging structure for inorganic phase change materials. Background Technology

[0002] Phase change materials (PCMs) are advanced chemical materials capable of storing and releasing heat energy. They absorb or release heat at specific temperatures through phase changes (such as from solid to liquid or vice versa). These materials can effectively control the temperature of their environment or be used to store heat energy for extended periods so that it can be released when needed.

[0003] Inorganic phase change materials mainly include crystalline hydrated inorganic salts and metal alloys. Inorganic phase change materials have a higher density, and their heat storage density per unit volume is significantly higher than that of organic phase change materials. They also require less volume for the same amount of heat storage, making them more suitable for applications requiring small volume and high heat storage.

[0004] The corrosivity and cycling stability of inorganic phase change materials (PCMs) are major constraints on their application in aerospace, weaponry, and other fields. Due to lightweight requirements, PCM heat sinks are typically made of aluminum alloys, but inorganic PCMs such as Ba(OH)2•8H2O are prone to chemical corrosion of aluminum alloys, leading to PCM leakage and subsequent failure of critical electronic components. Furthermore, hydrated inorganic salt PCMs are susceptible to water loss during cycling. For example, Ba(OH)2•8H2O and CH3COONa•3H2O transform into Ba(OH)2 and CH3COONa after water loss, completely altering their thermal properties. Cycling stability is another significant challenge limiting the application of inorganic PCMs. To meet the requirements for corrosion resistance and improve cycling stability, a proper encapsulation solution for inorganic PCMs is urgently needed to address this challenge. Utility Model Content

[0005] This invention provides a corrosion-resistant encapsulation structure for inorganic phase change materials, solving the problem of corrosion in inorganic material encapsulation containers.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a corrosion-resistant encapsulation structure for inorganic phase change materials, including a cover plate and a shell. The shell has a cavity for placing the inorganic phase change material. The shell has an annular rib on the outer side of the cavity opening. The cover plate contacts the shell on one side to close the cavity. The cover plate has an annular rib groove on the side near the shell. The rib groove engages with the rib. The cavity wall of the shell and the cover plate on the side near the shell are provided with a corrosion-resistant coating. The shell also has an annular sealing ring groove on the side of the cavity opening. A sealing ring is provided in the sealing ring groove, and the sealing ring groove is located inside the rib.

[0007] In the preferred scheme, the shell is provided with a flange structure near one end of the cover plate, and is also provided with a connecting bolt, the cover plate is connected with the flange structure through the connecting bolt.

[0008] In the preferred scheme, the flange structure is provided with a second connecting hole, the cover plate is provided with a first connecting hole near the outer edge, and the connecting bolt passes through the second connecting hole to be screwed with the first connecting hole.

[0009] In the preferred scheme, the shell outer wall is provided with a ring groove structure, the flange structure is a buckle block which can be separated from the shell, one end of the buckle block is provided with a hook structure, the ring groove structure is provided with an inclined taper surface structure, the hook structure is abutted on the inclined taper surface structure, and the sealing ring groove is arranged on the buckle block and connected with the cover plate through a bolt.

[0010] In the preferred scheme, the connecting bolt passes through the buckle block to be screwed with the cover plate.

[0011] In the preferred scheme, a plurality of clamping blocks are further arranged, and the cover plate and the shell are connected through the clamping blocks.

[0012] In the preferred scheme, one end of the clamping block is provided with an inclined buckle structure, the other end of the clamping block is provided with a strip-shaped protruding structure, the shell outer wall is provided with a straight groove structure, the strip-shaped protruding structure is inserted into the straight groove structure, the outer edge of the cover plate is provided with a chamfer structure, the inclined buckle structure is abutted on the chamfer structure, a connecting bolt is further arranged, and the connecting bolt passes through the clamping block to be screwed with the shell.

[0013] In the preferred scheme, the straight groove structure is provided with an elastic pad, and the strip-shaped protruding structure presses the elastic pad.

[0014] The beneficial effects of the utility model are as follows: the utility model can effectively prevent inorganic phase change material from corroding an aluminum alloy heat sink, does not affect the filling space of internal phase change material, has simple structure, is easy to realize, satisfies the application scene of lightweight weapon equipment such as a missile-borne radar seeker, can prevent the cover plate from being raised due to the elasticity of the sealing ring, does not affect the welding performance, has a three-seal structure, that is, an anticorrosion coating, a sealing ring and a weld, can effectively prevent water molecules from flowing out, and avoids the problem of heat performance decline caused by the escape of water molecules in the use process of part of hydrated inorganic salt phase change material. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model will be further described in connection with the drawings and embodiments.

[0016] Figure 1 It is a flange type connection scheme structure diagram of the utility model.

[0017] Figure 2 It is a flange type connection scheme sectional view of the utility model.

[0018] Figure 3 It is a buckle diagram of the flange type connection scheme of the utility model.

[0019] Figure 4 This is a sectional view of the cut protruding part of this utility model.

[0020] Figure 5 This is a schematic diagram of the second temporary connection scheme.

[0021] Figure 6 This is a bottom diagram of the second temporary connection scheme.

[0022] Figure 7 This is a schematic diagram of the third temporary connection scheme.

[0023] Figure 8 This is a bottom diagram of the third temporary connection scheme.

[0024] Figure 9 This is a magnified view of the card slot.

[0025] In the figure: cover plate 1; small rib groove 101; first connecting hole 102; chamfered structure 103; sealing ring 2; inorganic phase change material 3; shell 4; small rib 401; sealing ring groove 402; flange structure 403; second connecting hole 404; annular groove structure 405; oblique conical surface structure 406; straight groove structure 407; anti-corrosion coating 5; connecting bolt 6; friction welded head 7; fastener 8; hook structure 801; snap-fit ​​block 9; oblique snap structure 901; strip protrusion structure 902; elastic pad 10. Detailed Implementation

[0026] Example 1:

[0027] like Figures 1-9 In this invention, an anti-corrosion encapsulation structure for an inorganic phase change material is provided, comprising a cover plate 1 and a housing 4. The housing 4 has a cavity for placing the inorganic phase change material 3. The housing 4 has an annular rib 401 on the outer side of the cavity opening. One side of the cover plate 1 contacts the housing 4 to close the cavity of the housing 4. The cover plate 1 has an annular rib groove 101 on the side near the housing 4. The rib groove 101 is engaged with the rib 401. The cavity wall of the housing 4 and the side of the cover plate 1 near the housing 4 are provided with an anti-corrosion coating 5. The housing 4 also has an annular sealing ring groove 402 on the side of the cavity opening. The sealing ring groove 402 contains a sealing ring 2 and is located inside the rib 401.

[0028] When the cover plate 1 is placed on the shell 4, the anti-corrosion coating 5 of both the cover plate 1 and the shell 4 completely covers the outer side of the inorganic phase change material 3, preventing corrosion of the materials of the cover plate 1 and the shell 4. The friction welding head 7 of the friction stir welding equipment stirs and heats up, melting the thin-walled joint structure at the bottom of the groove 101 of the small rib, passing through and rubbing the top of the small rib 401, so that the contact part between the small rib 401 and the groove 101 melts, and after cooling, they are welded together. The cover plate 1 presses against the sealing ring 2 to form a seal, isolating the cavity space of the shell 4 and preventing welding residue from entering from the interface gaps.

[0029] In the preferred embodiment, the end of the housing 4 near the cover plate 1 is provided with a flange structure 403 and a connecting bolt 6, and the cover plate 1 is connected to the flange structure 403 by the connecting bolt 6.

[0030] In the preferred embodiment, the flange structure 403 is provided with a second connection hole 404, and the cover plate 1 is provided with a first connection hole 102 near the outer edge. The connecting bolt 6 passes through the second connection hole 404 to be threadedly connected to the first connection hole 102.

[0031] The head of the connecting bolt 6 is located on one side of the flange structure 403, which will not interfere with the welding of the upper section of the cover plate 1.

[0032] Connecting bolts 6 temporarily connect cover plate 1 and housing 4 to prevent parts from shifting during welding. After cover plate 1 and housing 4 are welded, the protruding flange structure 403 and the part connected to the flange structure 403 are cut off along the outer contour of housing 4.

[0033] In the preferred embodiment, the outer wall of the housing 4 is provided with an annular groove structure 405, the flange structure 403 is a fastener 8 that can be separated from the housing 4, one end of the fastener 8 is provided with a hook structure 801, the annular groove structure 405 is provided with an inclined conical surface structure 406, the hook structure 801 abuts against the inclined conical surface structure 406, and the sealing ring groove 402 is provided on the fastener 8 and connected to the cover plate 1 by bolts.

[0034] In the preferred embodiment, the connecting bolt 6 passes through the fastener 8 to be threadedly connected to the cover plate 1.

[0035] After the cover plate 1 and the housing 4 are welded together, the connecting bolts 6 can be removed, the fastener 8 can be taken off, and then the part of the cover plate 1 that protrudes from the outer contour of the housing 4 can be cut off. Compared with the first solution, the thickness can be reduced and the processing difficulty can be decreased.

[0036] In a preferred embodiment, multiple snap-fit ​​blocks 9 are also provided, and the cover plate 1 and the housing 4 are connected by snap-fit ​​blocks 9.

[0037] In the preferred embodiment, one end of the snap-fit ​​block 9 is provided with a slanted buckle structure 901, and the other end of the snap-fit ​​block 9 is provided with a strip-shaped protrusion structure 902. The outer wall of the housing 4 is provided with a straight groove structure 407, and the strip-shaped protrusion structure 902 is inserted into the straight groove structure 407. The outer edge of the cover plate 1 is provided with a chamfer structure 103, and the slanted buckle structure 901 abuts against the chamfer structure 103. A connecting bolt 6 is also provided, which passes through the snap-fit ​​block 9 to be threadedly connected to the housing 4.

[0038] In the preferred embodiment, the straight groove structure 407 is provided with an elastic pad 10, and the strip-shaped protrusion structure 902 presses the elastic pad 10.

[0039] In the third scheme, the outer surfaces of the cover plate 1 and the housing 4 are flush. The cover plate 1 and the housing 4 are connected by a snap-fit ​​block 9. The snap-fit ​​block 9 is locked to the side wall of the housing 4 by a connecting bolt 6. As the connecting bolt 6 is tightened, the elastic pad 10 is gradually pressed. At the same time, the oblique buckle structure 901 gradually approaches the chamfer structure 103 until it presses the chamfer structure 103, thus pressing the cover plate 1 onto the end face of the housing 4.

[0040] After the cover plate 1 and the housing 4 are welded together, the snap-fit ​​block 9 can be removed. Since there are no protruding parts, no additional processing or cutting is required.

[0041] Example 2:

[0042] A corrosion-resistant encapsulation solution for inorganic phase change cold plates, such as Figure 1 As shown, it consists of four parts: a cover plate 1, a sealing ring 2, an inorganic phase change material 3, and a shell 4. The cover plate 1 includes small rib grooves 101, and the portion in contact with the inorganic phase change material is coated with an anti-corrosion coating 5. The shell 4 includes small ribs 401 and a sealing ring groove 402, and the portion in contact with the inorganic phase change material is coated with an anti-corrosion coating 5.

[0043] According to the above scheme, the sealing ring material can be selected from fluororubber, polytetrafluoroethylene, polyurethane, fluorinated rubber, ethylene propylene rubber, fluorosilicone rubber, EPDM, etc. to meet the anti-corrosion requirements of different types of inorganic phase change materials. The sealing ring type can adopt various models such as O-ring, V-ring, U-ring, Y-ring, and rectangular sealing ring.

[0044] According to the above scheme, the anti-corrosion coating 5 can be selected from polytetrafluoroethylene, epoxy resin, polyurethane, etc.

[0045] According to the above scheme, the inorganic phase change material 3 that can be effectively encapsulated includes, but is not limited to, one or more of the following in any proportion: barium hydroxide octahydrate, aluminum ammonium sulfate dodecahydrate, sodium acetate trihydrate, magnesium sulfate hexahydrate, oxalic acid dihydrate, boric acid, potassium aluminum sulfate dodecahydrate, sodium sulfate decahydrate, copper sulfate heptahydrate, and ferrous sulfate heptahydrate.

[0046] The above-mentioned anticorrosion packaging scheme for the inorganic phase change cold plate has the following specific processing steps:

[0047] (1) The cover plate 1 and the shell 4 are processed according to the drawing, wherein, in order to prevent the temperature from being too high during friction stir welding to cause the sealing ring to fail, and to reduce the volume, the small ribs 401 are spaced apart from the sealing ring grooves 402 by 1-2 mm, the small ribs 401 are 1 mm wide and 2 mm high, the sealing ring grooves 402 are 1.1 mm wide and 0.7 mm deep, the wall thickness of the cover plate 1 and the shell 4 is controlled to be 2-5 mm, so as to prevent the water molecules in the hydrated inorganic salt phase change material from being gasified under high temperature to cause the internal pressure to be too large and cause the heat sink to deform and bulge;

[0048] (2) The inner surface of the shell 4 and the contact area between the cover plate 1 and the phase change material are locally sprayed with an anticorrosion coating, and in this example, a polytetrafluoroethylene coating is selected, and the spraying thickness is 20-80 microns; after the coating is completely attached, the inorganic phase change material is loaded into the shell 4;

[0049] (3) The sealing ring 2 is loaded into the sealing ring groove 402, the sealing ring is an O-shaped sealing ring, the material is fluorine glue, the wire diameter is 1 mm, and the sealing ring plays a sealing and anticorrosion role;

[0050] (4) The cover plate 1 and the shell 4 are assembled, the small ribs 401 are ensured to be completely embedded in the small rib grooves 101, the screws are screwed, the sealing ring is ensured to be compacted, and the cover plate 1 and the shell 4 are completely attached;

[0051] (5) Friction stir welding is adopted, and penetration welding is performed along the small rib 401 path; the length of the stirring needle of the selected stirring head is 2 mm, the diameter of the needle tip is 2.0 mm, the diameter of the needle root is 2.8 mm, the diameter of the shaft shoulder is 5.6 mm, the sinking is 0.1 mm, the stirring head rotation speed during penetration welding is 2000 revolutions / minute, and the welding speed is 120 mm / minute; after the welding is completed, the screws around are removed, a CNC vertical machining center is used to mill away the thread structure around the cutting path, and finally the product is a cuboid; the thread structure is only used to fix the cover plate 1 and the shell 4, prevent the cover plate 1 from being raised due to the elasticity of the sealing ring, affect the welding, and the thread structure does not limit the appearance, and the appearance of the final product can be customized.

[0052] The above-mentioned embodiments are only preferred technical solutions of the present application, and should not be regarded as limiting the present application; the protection scope of the present application should be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features recorded in the claims as the protection scope. That is, equivalent replacement improvements within this range are also within the protection scope of the present application.

Claims

1. An anticorrosion encapsulation structure of inorganic phase change material, characterized by: The utility model relates to a cover plate (1) and casing (4) are included, the cavity for placing inorganic phase change material (3) is equipped with in casing (4), the annular small muscle (401) of casing (4) is equipped with outside one side of cavity opening, the cavity of casing (4) is closed with casing (4) contact to the one side of cover plate (1), the annular small muscle recess (101) of cover plate (1) is equipped with one side close to casing (4), small muscle recess (101) is buckled with small muscle (401), the cavity wall of casing (4) and the one side close to casing (4) of cover plate (1) are equipped with anticorrosive coating (5), casing (4) is equipped with annular sealing ring recess (402) on one side of cavity opening, and sealing ring (2) is equipped in sealing ring recess (402), and sealing ring recess (402) is equipped in the inside of small muscle (401).

2. The anticorrosion encapsulation structure of inorganic phase change material according to claim 1, characterized in that: The flange structure (403) is equipped with in casing (4) one end close to cover plate (1), and the connecting bolt (6) is further equipped, and the cover plate (1) is connected with the flange structure (403) through the connecting bolt (6).

3. The anticorrosion encapsulation structure of inorganic phase change material according to claim 2, characterized in that the flange The structure (403) is equipped with the second connecting hole (404), and the first connecting hole (102) is equipped in the outer edge of cover plate (1), and the connecting bolt (6) passes through the second connecting hole (404) to be connected with the first connecting hole (102) threadedly.

4. The anticorrosion encapsulation structure of inorganic phase change material according to claim 2, characterized in that: The outer wall of casing (4) is equipped with annular groove structure (405), and the flange structure (403) is the buckle (8) that can be separated with casing (4), and the buckle (8) one end is equipped with hook structure (801), and the annular groove structure (405) is equipped with inclined taper surface structure (406), and the hook structure (801) is abutted on inclined taper surface structure (406), and the sealing ring recess (402) is equipped on the buckle (8) and is connected with the cover plate (1) through bolt.

5. The anticorrosion encapsulation structure of inorganic phase change material according to claim 4, characterized in that: The connecting bolt (6) passes through the buckle (8) to be connected with the cover plate (1) threadedly.

6. The anticorrosion encapsulation structure of inorganic phase change material according to claim 1, characterized in that: A plurality of clamping blocks (9) are further provided, and the cover plate (1) and the casing (4) are connected through the clamping blocks (9).

7. The anticorrosion encapsulation structure of inorganic phase change material according to claim 6, characterized in that: One end of the clamping block (9) is provided with an inclined buckle structure (901), the other end of the clamping block (9) is provided with a strip-shaped protruding structure (902), the outer wall of the casing (4) is provided with a straight groove structure (407), the strip-shaped protruding structure (902) is inserted into the straight groove structure (407), the outer edge of the cover plate (1) is provided with a chamfer structure (103), the inclined buckle structure (901) is abutted on the chamfer structure (103), and a connecting bolt (6) is further provided, the connecting bolt (6) passes through the clamping block (9) to be connected with the casing (4) threadedly.

8. The anticorrosion encapsulation structure of inorganic phase change material according to claim 7, characterized in that: The straight groove structure (407) is provided with an elastic pad (10), and the strip-shaped protruding structure (902) compresses the elastic pad (10).

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