阅读说明：本技术 一种螺接应力分解结合激光封焊的大腔体结构 (Big cavity structure of spiro union stress decomposition combination laser seal welding ) 是由 洪肇斌 李凤英 赵玉申 周织建 王传伟 胡子祥 祝先 袁德明 赵凯 汪君 刘琳 于 2019-08-29 设计创作，主要内容包括：本发明公开一种螺接应力分解结合激光封焊的大腔体结构,包括盒体、主盖板、小盖板、紧固件；所述盒体设置有加强部,所述加强部上设置有带有螺纹的连接孔,所述主盖板上设置有连接部,所述连接部对应所述加强部设置,所述连接部上设置有通孔,所述紧固件穿过所述通孔与所述连接孔螺纹连接,且所述盒体和所述主盖板的外边缘密封连接；所述通孔在远离所述盒体的端部设置有所述小盖板,所述小盖板设置于所述通孔端部并与所述通孔密封连接；采用本发明结构可以显著提高大密闭腔体盖板封焊结构的抗变形能力,降低焊缝处应力水平,从而利于高集成电子设备的高可靠设计。(The invention discloses a large cavity structure for bolt joint stress decomposition combined laser seal welding, which comprises a box body, a main cover plate, a small cover plate and a fastening piece, wherein the main cover plate is arranged on the box body; the box body is provided with a reinforcing part, a connecting hole with threads is formed in the reinforcing part, a connecting part is arranged on the main cover plate and corresponds to the reinforcing part, a through hole is formed in the connecting part, the fastener penetrates through the through hole to be in threaded connection with the connecting hole, and the box body is in sealed connection with the outer edge of the main cover plate; the end part of the through hole far away from the box body is provided with the small cover plate, and the small cover plate is arranged at the end part of the through hole and is in sealing connection with the through hole; the structure of the invention can obviously improve the deformation resistance of the sealing and welding structure of the cover plate of the large sealed cavity and reduce the stress level at the welding seam, thereby being beneficial to the high-reliability design of high-integration electronic equipment.)

1. A large cavity structure combining screw joint stress decomposition and laser seal welding is characterized by comprising a box body, a main cover plate, a small cover plate and a fastening piece; the box body is provided with a reinforcing part, a connecting hole with threads is formed in the reinforcing part, a connecting part is arranged on the main cover plate and corresponds to the reinforcing part, a through hole is formed in the connecting part, the fastener penetrates through the through hole to be in threaded connection with the connecting hole, and the box body is in sealed connection with the outer edge of the main cover plate; the end part of the through hole far away from the box body is provided with the small cover plate, and the small cover plate is arranged at the end part of the through hole and is in sealing connection with the through hole.

2. A bolted stress-resolved laser-sealed large-cavity structure as claimed in claim 1, wherein said reinforcement is provided at the central location of said box.

3. The large cavity structure for bolt joint stress decomposition and laser seal welding according to claim 1, wherein the connecting part and the reinforcing part are in contact connection to form a force bearing structure.

4. The large cavity structure for bolt joint stress decomposition combined laser sealing welding according to claim 1, wherein a boss is arranged on the outer edge of the box body corresponding to the main cover body, and the boss limits the relative position of the box body and the main cover body in a connection state.

5. The large cavity structure for bolt joint stress-resolved laser sealing and welding according to claim 1, wherein a groove is formed at one end of the through hole, the groove is matched with the small cover plate in shape, and the small cover plate is hermetically connected in the groove.

6. The bolted stress-resolved laser-sealed large-cavity structure as claimed in claim 1, wherein the sealed connection of the outer edges of the box body and the main cover plate and the sealed connection of the small cover plate at the end of the through hole are both formed by laser welding.

7. The large-cavity structure for the screw joint stress decomposition and laser sealing welding according to claim 6, wherein the laser welding adopts a high-frequency high-speed welding mode.

8. The large cavity structure for the bolt joint stress decomposition and laser sealing welding according to claim 1, wherein the thickness of the small cover plate is set to be 1.2 mm-1.5 mm.

Technical Field

The invention relates to the technical field of airtight welding structures of closed cavities, in particular to a large cavity structure combining screw joint stress decomposition and laser sealing welding.

Background

The requirements for the use environment of electronic equipment which is more and more severe are that the protection requirements on moisture resistance, mold resistance, salt mist resistance and the like are higher and higher. The insufficient protection of the electronic equipment product directly affects the performance indexes of the product, such as signal emission and reception, electric conduction, magnetic conduction, electromagnetic shielding and the like. With the increasingly high requirements on performance indexes and reliability of electronic equipment, part of the electronic equipment also has long service life, and a good protection design is urgently needed for a bare chip electronic device or a waveguide structure needing airtight packaging and the like. For the conventional design, a single chip and a single structure are mainly packaged independently or packaged in a small module, and the design needs large space and weight and cannot meet the miniaturization and high integration requirements of advanced electronic products. In order to meet the requirements of miniaturization, high integration and light weight of advanced electronic products, unified large-cavity fusion packaging design is carried out on a bare chip and a waveguide structure needing airtight packaging. Therefore, the problem of hermetic packaging of large hermetic chambers is to be solved.

At present, a single aluminum alloy box body and an aluminum alloy cover plate are sealed airtight, and the cover plate of the large cavity is large in stress area and weak in overall strength when the low air pressure is close to a vacuum state. The cover plate is easy to deform and the welding seam is easy to crack when the cover plate bears the force of 1 atmosphere in a low-pressure environment.

In view of the above-mentioned drawbacks, the inventors of the present invention have finally obtained the present invention through a long period of research and practice.

Disclosure of Invention

In order to solve the technical defects, the invention adopts the technical scheme that a large cavity structure combining the screw connection stress decomposition and the laser sealing welding is provided, and the large cavity structure comprises a box body, a main cover plate, a small cover plate and a fastening piece; the box body is provided with a reinforcing part, a connecting hole with threads is formed in the reinforcing part, a connecting part is arranged on the main cover plate and corresponds to the reinforcing part, a through hole is formed in the connecting part, the fastener penetrates through the through hole to be in threaded connection with the connecting hole, and the box body is in sealed connection with the outer edge of the main cover plate; the end part of the through hole far away from the box body is provided with the small cover plate, and the small cover plate is arranged at the end part of the through hole and is in sealing connection with the through hole.

Preferably, the reinforcing part is provided at a central position of the case.

Preferably, the connecting part and the reinforcing part are in contact connection to form a force bearing structure.

Preferably, the outer edge of the box body is provided with a boss corresponding to the main cover body, and the boss limits the relative position of the box body and the main cover body in a connection state.

Preferably, one end of the through hole is provided with a groove, the groove is matched with the small cover plate in shape, and the small cover plate is hermetically connected in the groove.

Preferably, the outer edges of the box body and the main cover plate are hermetically connected, and the small cover plate is hermetically connected at the end part of the through hole by laser welding.

Preferably, the laser welding adopts a high-frequency high-speed welding mode.

Preferably, the thickness of the small cover plate is set to be 1.2 mm-1.5 mm.

Compared with the prior art, the invention has the beneficial effects that: 1, the structure of the invention can obviously improve the deformation resistance of the seal welding structure of the cover plate of the large sealed cavity and reduce the stress level at the welding seam, thereby being beneficial to the highly reliable design of highly integrated electronic equipment; 2, the structure of the invention can realize the integrated unified airtight design of the multifunctional bare chip and the waveguide structure, which is beneficial to the miniaturization, high integration and same cooperation design of the new generation of electronic equipment products; 3, stress decomposition is carried out by means of mechanical locking through reasonable design of a bearing fastening point, and the stress value of a welding seam for sealing and welding a large sealed cavity can be effectively reduced; 4, by adopting a closed bearing structure design, the whole rigidity of the large sealed cavity can be improved while the bearing structure of the sealed cavity is increased, and the stress deformation is prevented; 5, the large cavity is airtight by adopting a mode of welding aluminum alloy and combining a main deformation area in a screwed connection and fastening mode, the reliability is high, and meanwhile, the long-period storage requirement of part of electronic equipment can be met due to the fact that the electronic equipment is packaged by a mechanical structure; and 6, the screw fastening part adopts the small cover plate and the main cover plate to carry out laser seal welding for carrying out airtight packaging, so that the local rigidity of the perforated area can be improved while the airtight design is met.

Drawings

FIG. 1 is a schematic diagram of the external structure of the large cavity structure for the bolt joint stress decomposition combined laser seal welding;

FIG. 2 is a schematic view of the internal structure of the large cavity structure for the bolt joint stress decomposition combined with laser seal welding;

FIG. 3 is a schematic structural diagram of the cartridge body;

FIG. 4 is a schematic structural view of the main cover plate;

fig. 5 is a schematic structural view of the small cover plate.

The figures in the drawings represent:

1-sealing the cavity; 2-box body; 3-a main cover plate; 4-small cover plate; 5-fastening the screw.

Detailed Description

The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.