Wall structure of an environmental test chamber

Abstract

The application discloses a box wall structure of an environmental test box, comprising an outer shell, an inner shell and a heat preservation layer, wherein the inner shell is spliced by a plurality of plate pieces, each plate piece comprises a plane part, a spherical surface part and an inclined surface part connected with each other, the spherical surface part is arranged at the center of the plane part, and the inclined surface part is arranged at the outer periphery of the plane part. The inner shell is designed by a plurality of plate pieces, each plate piece is provided with a protruding spherical surface part, the average expansion increment is greatly reduced, the plate piece is not easy to deform, the force of the plate piece on the welding points around is reduced, the load of the welding points is reduced, the risk of stress cracks or welding point fracture of the welding points is reduced, the reliability of welding is ensured, the reliability of the inner shell is improved, and the reliability of the test box is improved.

Description

Technical Field

[0001] This invention relates to the field of environmental test chamber technology, and in particular to a chamber wall structure for an environmental test chamber. Background Technology

[0002] Environmental test chambers are testing devices that simulate atmospheric climate environments. They are widely used in aerospace products, electronic instruments, materials, electrical and electronic products, and various electronic components to simulate and test various performance indicators of products.

[0003] Environmental test chambers typically employ a three-layer structure, consisting of an outer chamber, an inner chamber, and an insulation layer between the outer and inner chambers. The outer chamber is usually made of powder-coated steel, while the inner chamber is typically made of 304 stainless steel. The coefficient of linear expansion of 304 stainless steel in the temperature range of 20–300℃ is 17.5 × 10⁻⁶. -6 If the temperature is m / ℃, then for 1000 meters of 304 stainless steel, within the temperature range of 20~300℃, the average expansion increment is 17.5 mm for every 1℃ increase in temperature. In existing technology, for ease of processing and installation, the inner liner of the test chamber is usually made of a single piece of flat stainless steel plate, with the edges connected by welding. When a 10-meter-long test chamber is subjected to high and low temperature tests within the temperature range of -120℃ to +180℃, the flat stainless steel plate of the inner liner will experience an expansion of 17.5 × 10⁻⁶ mm. -6 ×10×(180-(-120))=52.5×10 -3 The average expansion increment is 52.5mm. This large expansion increment makes the flat stainless steel plate prone to deformation, and once deformed, it cannot recover, resulting in a wavy shape on the stainless steel surface. Since the flat stainless steel plate is fixed by welding, the stress at the weld points increases after deformation. During high and low temperature cycling tests, the increased load at the weld points can easily cause stress cracks or weld breakage, affecting the reliability of the weld and consequently the reliability of the test chamber. Summary of the Invention

[0004] In view of the shortcomings of the existing environmental test chamber wall structure, the applicant provides a reasonable environmental test chamber wall structure, in which the inner liner adopts a segmented, spherical plate design to reduce expansion increment and improve the reliability of the test chamber.

[0005] The technical solution adopted in this invention is as follows:

[0006] An environmental test chamber wall structure includes an outer liner, an inner liner, and an insulation layer. The inner liner is composed of several panels spliced ​​together. Each panel includes a connected flat part, a spherical part, and an inclined part. The spherical part is located in the center of the flat part, and the inclined part is located on the outer periphery of the flat part.

[0007] As a further improvement to the above technical solution:

[0008] The spherical part bulges outwards towards the inside of the box, while the sloping part tilts outwards towards the inside of the box.

[0009] Several plates are spliced ​​together by several horizontal and vertical bars, and the outer edge of the inclined section is welded and fixed to the horizontal or vertical bars.

[0010] The ratio of the area S1 of the planar part to the total orthographic projection area S0 of the plate is S1 / S0 = 0.28 to 0.58; the ratio of the orthographic projection area S2 of the spherical part to the total orthographic projection area S0 of the plate is S2 / S0 = 0.40 to 0.70.

[0011] The minimum distance dmin from the side of the spherical part to the outer edge of the plate is 10-95 mm; the radius R of the spherical part is 700-1500 mm; and the maximum height H1max of the spherical part protruding from the flat part is 15-70 mm.

[0012] The height H2 of the beveled surface is less than or equal to the maximum height H1max of the spherical surface, and H2 = 8 to 30 mm.

[0013] The angle α between the beveled part and the flat part is obtuse, α = 100° to 150°; the angle β between the beveled part and the corresponding side of the horizontal or vertical bar is acute, β = 10° to 60°.

[0014] The board is square, with a length L of 300-700mm and a width W of 300-700mm.

[0015] The flat part of the plate transitions to the spherical and beveled parts with rounded corners.

[0016] The average thickness of the box wall is T=160~250mm; the outer liner is made of powder-coated steel plate, the inner liner is made of stainless steel, and the insulation layer is made of rock wool, glass wool, or polyurethane foam board; the horizontal and vertical bars are made of hollow square tubes; the side length A1 of the horizontal bar is greater than the side length A2 of the vertical bar, and A2 / A1=0.4~0.6.

[0017] The beneficial effects of this invention are as follows:

[0018] The inner liner of this invention is designed with several plates, which greatly reduces the average expansion increment of a single plate compared to the existing single flat stainless steel plate. The plates are less prone to deformation, which reduces the force exerted by the plates on the surrounding weld joints, reduces the load on the weld joints, reduces the risk of stress cracks or weld joint breakage, ensures the reliability of welding, improves the reliability of the inner liner, and improves the reliability of the test chamber.

[0019] Each plate in this invention features a raised spherical surface. The inner cavity of the spherical surface provides space for the plate to expand. When the plate expands due to temperature increase, the spherical surface absorbs a portion of the expansion increase from the flat portion using its inner cavity, thereby reducing the expansion increase of the flat portion. Furthermore, when the spherical surface itself expands, it absorbs the expansion increase through self-adjustment of its spherical curvature, significantly reducing or even eliminating the outward expansion increment. Therefore, compared to a flat plate, the outward expansion increment of the plate with the spherical surface is greatly reduced, further reducing the force exerted by the plate on the surrounding weld joints, reducing the load on the weld joints, improving the reliability of the plate welding, and enhancing the reliability of the inner liner and the test chamber. Moreover, the spherical surface absorbs the expansion increment through changes in its spherical curvature, and after the expansion increment disappears, the spherical surface can also recover through changes in its spherical curvature. Therefore, no deformation or wavy shape occurs on its spherical surface, ensuring the plate's performance and improving reliability.

[0020] In this invention, the beveled portion of each plate is located around the outer periphery of the flat portion. When the flat portion expands outward, the beveled portion can absorb part or even all of the outward expansion increment of the flat portion through changes in its slope, further reducing the expansion increment of the plate, reducing the load on the solder joints, and improving reliability. Moreover, after the expansion increment disappears, the beveled portion can also recover through changes in its slope, avoiding plate deformation, ensuring plate performance, and improving reliability. Attached Figure Description

[0021] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 2 for Figure 1 A schematic diagram of the right-side structure.

[0023] Figure 3 for Figure 1 Enlarged view of part A in the middle.

[0024] Figure 4 for Figure 3 Enlarged view of section B in the middle.

[0025] In the diagram: 1. Outer liner; 2. Inner liner; 21. Plate; 211. Flat part; 212. Spherical part; 213. Angled part; 22. Horizontal bar; 23. Vertical bar; 3. Insulation layer; 10. Outer side of the box; 20. Inner side of the box. Detailed Implementation

[0026] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] like Figure 1As shown, this invention is applied to an environmental test chamber, suitable for high and low temperature testing within a temperature range of -120℃ to +180℃ (or even lower and / or higher temperatures). The chamber wall structure of this invention includes an outer liner 1, an inner liner 2, and an insulation layer 3 filled between the outer liner 1 and the inner liner 2. The outer liner 1 is made of powder-coated steel plate, the inner liner 2 is made of stainless steel, and the insulation layer 3 can be made of rock wool, glass wool, or polyurethane foam board. The left side of the outer liner 1 is the outer side 10, and the right side of the inner liner 2 is the inner side 20. The average wall thickness T = 160–250 mm, which is relatively thick and provides good insulation.

[0028] like Figure 1 , Figure 2 As shown, the inner liner 2 is composed of several arrayed plates 21 joined together by several horizontal bars 22 and vertical bars 23. The plates 21 are square plates, with a length L of 300–700 mm and a width W of 300–700 mm. In this embodiment, the plate 21 has a size of 500 mm (L) × 500 mm (W) for standardized design. After the inner liner 2 is designed with several plates 21, the average expansion increment of each plate 21 in the temperature range of -120℃ to +180℃ is 17.5 × 10⁻⁶. -6 ×0.5×(180-(-120))=2.625×10 -3 With m=2.6mm, compared to the existing solid flat stainless steel plate, the average expansion increment of a single plate 21 is greatly reduced, making the plate 21 less prone to deformation. This reduces the force exerted by the plate 21 on the surrounding weld points, reduces the load on the weld points, and lowers the risk of stress cracks or weld point breakage, ensuring the reliability of the welding, improving the reliability of the inner liner 2, and improving the reliability of the test chamber.

[0029] Each plate 21 includes a connected flat portion 211, a spherical portion 212, and a beveled portion 213. The spherical portion 212 is located in the center of the flat portion 211, and the beveled portion 213 is located on the outer periphery of the flat portion 211. The spherical portion 212 protrudes outward toward the inner side 20 of the box, and the outer edge of the beveled portion 213 is welded and fixed to the horizontal bar 22 or the vertical bar 23. The flat portion 211 is connected to the spherical portion 212 and the beveled portion 213 by rounded corners. The area S1 of the flat portion 211 accounts for 28% to 58% of the total orthographic projection area S0 of the plate 21, i.e., S1 / S0 = 0.28 to 0.58; the orthographic projection area S2 of the spherical portion 212 accounts for 40% to 70% of the total orthographic projection area S0 of the plate 21, i.e., S2 / S0 = 0.40 to 0.70. The minimum distance dmin from the side of the spherical portion 212 to the outer edge of the plate 21 is 10 to 95 mm. The radius R of the spherical part 212 is 700-1500 mm, and the maximum height H1max of the spherical part 212 protruding from the planar part 211 is 15-70 mm. Each plate 21 is provided with a protruding spherical part 212. The inner cavity of the spherical part 212 provides space for the expansion of the plate 21. When the plate 21 expands due to temperature increase, the planar part 211 of the plate 21 can expand outward and inward toward the inner cavity of the spherical part 212. That is, the spherical part 212 absorbs part of the expansion increment of the planar part 211 by utilizing its inner cavity, thereby reducing the expansion increment of the planar part 211; while the spherical part 212 generates expansion increment... When the expansion increment is absorbed by the change in the spherical curvature, the spherical part 212 absorbs its own expansion increment through self-adjustment of the spherical curvature. The outward expansion increment of the spherical part 212 is greatly reduced, or even zero. Therefore, compared with a flat plate, the outward expansion increment of the plate 21 with the spherical part 212 is greatly reduced, further reducing the force of the plate 21 on the surrounding weld joints, reducing the load on the weld joints, improving the welding reliability of the plate 21, and improving the reliability of the inner liner 2 and the test chamber. Moreover, the spherical part 212 absorbs the expansion increment by changing the spherical curvature. After the expansion increment disappears, the spherical part 212 can also recover by changing the spherical curvature. Therefore, no deformation or wave-like shape will occur on its spherical surface, ensuring the performance of the plate 21 and improving its reliability.

[0030] like Figure 3 , Figure 4As shown, the inclined surface 213 of the inner liner 2 curves outward from the flat surface 211 toward the inner side 20 of the box. That is, the direction of the inclined surface 213's curve is the same as the direction of the spherical surface 212's convexity. The height H2 of the inclined surface 213's curve from the flat surface 211 is less than or equal to the maximum height H1max of the spherical surface 212's convexity, where H2 = 8–30 mm. The angle α between the inclined surface 213 and the flat surface 211 is obtuse, α = 100°–150°; the angle β between the inclined surface 213 and the corresponding side of the horizontal bar 22 or vertical bar 23 is acute, β = 10°–60°. The inclined surface 213 is located on the outer periphery of the flat surface 211. When the flat surface 211 expands outward, the inclined surface 213 can absorb part or even all of the outward expansion increment of the flat surface 211 through changes in its inclination, further reducing the expansion increment of the plate 21, reducing the load on the weld joints, and improving reliability. Moreover, after the expansion increment disappears, the inclined surface 213 can also recover by changing the inclination, which avoids deformation of the plate 21, ensures the performance of the plate 21, and improves reliability.

[0031] like Figures 1 to 3 As shown, several horizontal bars 22 and vertical bars 23 are arranged crisscrossingly between the plates 21. On one hand, they act as connectors, linking the plates 21 together into a whole; on the other hand, they increase the strength of the inner liner 2 and improve its reliability. Both the horizontal bars 22 and vertical bars 23 are made of hollow square tubing, which, while ensuring sufficient strength and rigidity, results in lighter weight and higher stability and reliability. The side length A1 of the horizontal bar 22 is greater than the side length A2 of the vertical bar 23, where A2 / A1 = 0.4–0.6.

[0032] The above description is an explanation of the present invention and not a limitation thereof. The present invention can be modified in any form without departing from its spirit.

Claims

1. A wall structure of an environmental test chamber, comprising an outer liner (1), an inner liner (2), and an insulation layer (3), characterized in that: The inner liner (2) is made up of several plates (21). Each plate (21) includes a connected flat part (211), a spherical part (212) and a beveled part (213). The spherical part (212) is located in the center of the flat part (211), and the beveled part (213) is located on the outer periphery of the flat part (211). Several plates (21) are spliced ​​with several horizontal bars (22) and vertical bars (23). The outer side of the beveled part (213) is welded and fixed to the horizontal bar (22) or the vertical bar (23).

2. The chamber wall structure of the environmental test chamber according to claim 1, characterized in that: The spherical part (212) protrudes outward toward the inside of the box (20), and the sloping part (213) tilts outward toward the inside of the box (20).

3. The chamber wall structure of the environmental test chamber according to claim 1, characterized in that: The ratio of the area S1 of the planar part (211) to the total orthographic projection area S0 of the plate (21) is S1 / S0 = 0.28 to 0.58; the ratio of the orthographic projection area S2 of the spherical part (212) to the total orthographic projection area S0 of the plate (21) is S2 / S0 = 0.40 to 0.

70.

4. The chamber wall structure of the environmental test chamber according to claim 1, characterized in that: The minimum distance dmin from the side of the spherical part (212) to the outer side of the plate (21) is 10 to 95 mm; the radius R of the spherical part (212) is 700 to 1500 mm; and the maximum height H1max of the spherical part (212) protruding from the flat part (211) is 15 to 70 mm.

5. The chamber wall structure of the environmental test chamber according to claim 1, characterized in that: The height H2 of the beveled surface (213) is less than or equal to the maximum height H1max of the spherical surface (212), and H2 = 8~30mm.

6. The chamber wall structure of the environmental test chamber according to claim 1, characterized in that: The angle α between the inclined part (213) and the flat part (211) is an obtuse angle, α = 100°~150°; the angle β between the inclined part (213) and the corresponding side of the horizontal bar (22) or vertical bar (23) is an acute angle, β = 10°~60°.

7. The chamber wall structure of the environmental test chamber according to claim 1, characterized in that: The plate (21) is a square plate with a length L of 300-700mm and a width W of 300-700mm.

8. The chamber wall structure of the environmental test chamber according to claim 1, characterized in that: The planar portion (211) of the plate (21) is connected to the spherical portion (212) and the inclined portion (213) by rounded corners.

9. The chamber wall structure of the environmental test chamber according to claim 1, characterized in that: The average thickness of the box wall is T=160~250mm; the outer liner (1) is made of powder-coated steel plate, the inner liner (2) is made of stainless steel, and the insulation layer (3) is made of rock wool, glass wool, or polyurethane foam board; the horizontal bar (22) and the vertical bar (23) are made of hollow square tubes; the side length A1 of the horizontal bar (22) is greater than the side length A2 of the vertical bar (23), and A2 / A1=0.4~0.6.

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