Liquid cooling power module packaging method and device
By adopting a multi-layer sealing structure and automatic heat dissipation design in the liquid-cooled power module packaging device, the problems of reduced heat dissipation performance and module damage caused by coolant leakage are solved, and high sealing and stability of the package are achieved, ensuring normal operation of the equipment and effective use of the coolant.
Patent Information
- Application Number
- CN202510605858.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2025-10-17
AI Technical Summary
Coolant leakage in a liquid-cooled power module package can lead to reduced heat dissipation performance and damage to the power module, affecting the normal operation of the package device.
A liquid-cooled power module packaging device is used, including an outer shell, a packaging airbag, an expansion airbag, an extrusion plate and a fastening component. The multi-layer sealing structure and guide groove design ensure the sealing of the package, and the heat dissipation structure is automatically adjusted through the piston cavity to improve the heat dissipation efficiency.
It effectively prevents coolant leakage, improves the sealing and stability of the package, ensures the normal operation of the equipment, and automatically adjusts heat dissipation through temperature changes to extend the service life of the coolant.
Smart Images
Figure CN120809695A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power module packaging structure, in particular to a liquid-cooled power module packaging method and device. BACKGROUND
[0002] The packaging of a liquid-cooled power module is a complex and critical process that integrates power semiconductor chips, drive circuits, protection circuits, and other components to achieve electrical connection, structural support, and heat dissipation protection. Common packaging methods include double-sided heat dissipation packaging, embedded packaging, and direct liquid-cooled heat dissipation packaging.
[0003] The liquid-cooled power module packaging device needs to ensure that the cooling liquid circulates within a closed system, so the sealing structure is crucial. However, during long-term use, due to factors such as temperature changes and vibrations, the sealing parts are prone to aging and loosening. In direct liquid-cooled heat dissipation packaging, the cooling liquid directly contacts the power module. Once a leak occurs, the cooling liquid will directly contact the electronic components, which may cause short circuits, corrosion, and other serious problems, damaging the power module. Once the seal fails and the cooling liquid leaks, not only will the heat dissipation performance decrease, but it may also cause damage to the power module, triggering electrical faults and affecting the normal operation of the entire packaging device. Therefore, how to invent a liquid-cooled power module packaging method and device to solve these problems has become a problem that needs to be solved by technical personnel in the field. SUMMARY
[0004] To overcome the above shortcomings, the present application provides a liquid-cooled power module packaging method and device, which aims to solve the problem of cooling liquid leakage, which not only causes a decrease in heat dissipation performance but also may cause damage to the power module, triggering electrical faults and affecting the normal operation of the entire packaging device.
[0005] The present application is implemented as follows: The present application provides a liquid-cooled power module packaging device, which comprises an outer shell, the inside of the outer shell is provided with a lining plate, the side wall of the outer shell is provided with a packaging air bag and an extrusion plate, the extrusion plate is connected with an expansion air bag, and the device further comprises: A packaging assembly is connected to the outer shell, and the packaging assembly is used to store the cooling liquid. A fastening assembly is located on one side of the outer shell and the packaging assembly, and the fastening assembly is used to connect the outer shell and the packaging assembly. A heat dissipation assembly is connected to the packaging assembly, and the heat dissipation assembly is used to promote the cooling of the packaging assembly.
[0006] Preferably, the outer shell is fixedly connected to the lining plate, and the side wall of the lining plate is fixedly connected with a number of inserted rods distributed in a circumferential array. The side walls of the outer shell are respectively fixedly connected to the packaging airbag and the extrusion plate. The extrusion plate is located on the inner side of the packaging airbag. The side wall of the extrusion plate is provided with a storage groove, and the storage groove is in the shape of a "U". The inner wall of the storage groove is fixedly connected to the expansion airbag.
[0007] Preferably, a plurality of vent holes distributed in a linear array are provided on both sides of the extrusion plate, one end of the vent hole is connected to the packaging airbag, and the end of the vent hole away from the packaging airbag is connected to the side wall of the expansion airbag.
[0008] Preferably, the packaging component includes a packaging bottom shell, the side wall of the packaging bottom shell is provided with a guide groove, the guide groove is arranged in a "U" shape, a reflux cavity is provided inside the packaging bottom shell, and the inner walls on both sides of the guide groove are provided with a plurality of guide holes distributed in a linear array, and one end of the guide hole is connected to the reflux cavity.
[0009] Preferably, a sealing gasket is fixedly connected to the side wall of the packaging bottom shell, the sealing gasket is located on the inner side of the guide groove, and a groove is formed on the side wall of the sealing gasket.
[0010] Preferably, the heat dissipation component includes a fixing rod, and there are several fixing rods, each of which corresponds to an insertion rod. The fixing rod is fixedly connected to the bottom shell of the package, and a slot is provided at one end of the fixing rod, and the inner wall of the slot is slidably connected to the insertion rod.
[0011] Preferably, a piston cavity is opened at the end of the fixing rod away from the slot, and a piston rod and a return spring are provided inside the piston cavity. The piston rod is arranged in a "T" shape, and the piston rod is slidingly connected to the inner wall of the piston cavity. The two ends of the return spring are respectively fixedly connected to one end of the piston rod and the inner wall of the piston cavity.
[0012] Preferably, the fastening assembly includes a fixing plate 1 and a fixing plate 2, the fixing plate 1 is fixedly connected to the side wall of the outer shell, the fixing plate 2 is fixedly connected to the side wall of the packaging bottom shell, the side wall of the fixing plate 2 is fixedly connected to a threaded rod, the outer wall of the threaded rod is sleeved with a telescopic spring, one end of the telescopic spring is fixedly connected to the side wall of the fixing plate 2, and the other end of the telescopic spring is fixedly connected to a ring, the ring is sleeved on the outside of the threaded rod, and the threaded rod is threadedly connected to a packaging nut.
[0013] The method for operating the liquid-cooled power module packaging device as described above comprises the following steps: S1: first, when connecting the outer shell and the packaging bottom shell, the plurality of threaded rods are respectively inserted through the corresponding fixed plate I, and the insertion rod is inserted into the corresponding insertion slot, and the extrusion plate is aligned with the sealing gasket; S2: subsequently, the outer shell and the packaging bottom shell are extruded, and the packaging bottom shell extrudes the packaging air bag, and the telescopic spring is compressed by the interaction force between the fixed plate I and the sleeve ring; S3: finally, the packaging nut 22 is tightened on the outer wall of the threaded rod, and in this process, the inflation air bag fills the groove, and the packaging bottom shell is tightly connected with the packaging air bag, so as to complete the packaging process.
[0014] The beneficial effects of the present application are: 1、In the process of installing the packaging assembly, the threaded rod is first inserted through the fixed plate I, and then the packaging nut is connected with the threaded rod. During the process of tightening the packaging nut, the outer shell and the packaging bottom shell are close to each other, and the packaging bottom shell extrudes the packaging air bag, and the extrusion plate compresses the sealing gasket, so as to ensure the sealing of the outer shell and the packaging bottom shell. At the same time, the gas in the packaging air bag is transported to the inside of the inflation air bag through the vent hole, so that one end of the inflation air bag extends from the storage slot and fills the groove, so as to ensure the close fit between the inflation air bag and the groove. The elastic deformation between the two fills the gap and blocks the leakage of cooling liquid, thereby further increasing the sealing during the packaging process and improving the packaging effect. Finally, the packaging positioning is completed by the packaging nut, and the tight fit between the packaging air bag and the packaging bottom shell can form a peripheral sealing ring. By setting multiple sealing barriers, multiple lines of defense are formed, which greatly improves the sealing and stability after packaging. In addition, when the extrusion plate and the sealing gasket, as well as the inflation air bag and the groove, are affected by other factors and the sealing effect is poor or gaps appear, the leaked cooling liquid can be collected through the flow guide groove and flow into the return cavity for storage through the flow guide hole, thereby avoiding the leakage of cooling liquid and ensuring the reliability of the packaging structure. It also protects external elements and ensures the normal operation of the equipment.
[0015] 2、The gas in the piston cavity expands due to heat, thereby pushing the piston rod to move in the piston cavity, so that one end of the piston rod gradually moves away from the fixed rod and stretches the return spring, so that the relative position between the piston rod and the fixed rod changes, thereby increasing the heat dissipation area. When the temperature decreases, the gas contracts and returns, and the return spring resets the piston rod and returns to the initial state. In this way, the heat dissipation structure can be automatically adjusted according to temperature changes, the heat dissipation efficiency is improved, and the service life of the cooling liquid is effectively increased. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.
[0017] Figure 1 is a whole structure schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 2 is a packaging bottom shell structure schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 3 is a fastening assembly structure schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 4 is a whole explosion structure schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 5 is a packaging bottom shell internal structure schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 6 is a shell body structure schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 7 is a packaging bottom shell cross-section structure schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 8 is a packaging bottom shell longitudinal cross-section structure schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 9 is a Figure 8 structure enlarged schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application; Figure 10 is a Figure 8 structure enlarged schematic diagram of a liquid-cooled power module packaging method and device provided by the embodiments of the present application.
[0018] In the figure: 1, the outer shell; 2, fastening assembly; 21, threaded rod; 22, packing nut; 23, fixed plate one; 24, collar; 25, telescopic spring; 26, fixed plate two; 3, packaging assembly; 31, packaging bottom shell; 32, flow guide groove; 321, flow guide hole; 33, sealing gasket; 34, recess; 35, backflow cavity; 4, packaging air bag; 5, heat removal assembly; 51, piston rod; 52, fixed rod; 53, insertion slot; 54, piston cavity; 55, return spring; 6, lining plate; 7, insertion rod; 8, extrusion plate; 81, air hole; 82, storage groove; 9, expansion air bag. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0020] Embodiment, refer to Figures 1-10 A liquid-cooled power module packaging device, comprising an outer shell 1, the inside of the outer shell 1 is provided with a lining plate 6, the side wall of the outer shell 1 is provided with a packaging air bag 4 and an extrusion plate 8, the extrusion plate 8 is connected with an expansion air bag 9, and the device further comprises: A packaging assembly 3 connected with the outer shell 1, the packaging assembly 3 is used for storing the cooling liquid; A fastening assembly 2 located on one side of the outer shell 1 and the packaging assembly 3, the fastening assembly 2 is used for connecting the outer shell 1 and the packaging assembly 3; A heat removal assembly 5 connected with the packaging assembly 3, the heat removal assembly 5 is used for promoting the cooling of the packaging assembly 3.
[0021] Such as a method for operating a liquid-cooled power module packaging device, comprising the following steps: S1: first, when connecting the outer shell 1 and the packaging bottom shell 31, respectively pass a plurality of threaded rods 21 through the corresponding fixed plate one 23, and insert the insertion rod 7 into the corresponding insertion slot 53, and make the extrusion plate 8 align with the sealing gasket 33; S2: then, extrude the outer shell 1 and the packaging bottom shell 31, and make the packaging bottom shell 31 extrude the packaging air bag 4, and at the same time make the telescopic spring 25 compressed through the interaction force between the fixed plate one 23 and the collar 24; S3: finally, tighten the packing nut 22 on the outer wall of the threaded rod 21, and in this process, the expansion air bag 9 fills the recess 34, and at the same time, the packaging bottom shell 31 and the packaging air bag 4 are tightly connected, so as to complete the packaging process.
[0022] Furthermore, the outer shell 1 is fixedly connected to the lining plate 6, and the side wall of the lining plate 6 is fixedly connected with a number of insertion rods 7 distributed in a circumferential array. The side walls of the outer shell 1 are respectively fixedly connected to the packaging airbag 4 and the extrusion plate 8. The extrusion plate 8 is located on the inner side of the packaging airbag 4. The side wall of the extrusion plate 8 is provided with a storage groove 82, and the storage groove 82 is in the shape of a "return". The inner wall of the storage groove 82 is fixedly connected to the expansion airbag 9; a number of vents 81 distributed in a linear array are provided on both sides of the extrusion plate 8, one end of the vent 81 is connected to the packaging airbag 4, and the end of the vent 81 away from the packaging airbag 4 is connected to the side wall of the expansion airbag 9; the packaging assembly 3 includes a packaging bottom shell 31, and the side wall of the packaging bottom shell 31 is provided with a guide groove 32, and the guide groove 32 is in the shape of a "return". The package bottom shell 31 is provided with a reflux chamber 35, and the inner walls on both sides of the guide groove 32 are provided with a number of guide holes 321 distributed in a linear array, and one end of the guide hole 321 is connected to the reflux chamber 35; the fastening assembly 2 includes a fixing plate 1 23 and a fixing plate 2 26, the fixing plate 1 23 is fixedly connected to the side wall of the outer shell 1, the fixing plate 26 is fixedly connected to the side wall of the package bottom shell 31, the side wall of the fixing plate 26 is fixedly connected with a threaded rod 21, the outer wall of the threaded rod 21 is provided with a telescopic spring 25, one end of the telescopic spring 25 is fixedly connected to the side wall of the fixing plate 26, and the other end of the telescopic spring 25 is fixedly connected to the ring 24, the ring 24 is sleeved on the outside of the threaded rod 21, and the threaded rod 21 is threadedly connected with a packaging nut 22.
[0023] It should be noted that: when installing the packaging component 3, first, the multiple threaded rods 21 are respectively passed through the corresponding fixing plates 23, and the insertion rods 7 are inserted into the corresponding slots 53, and the extrusion plate 8 is aligned with the sealing gasket 33. In the initial state, the expansion airbag 9 is in a contracted state and contracted inside the storage groove 82. The sealing gasket 33 can be made of high-performance sealing materials such as fluororubber and silicone rubber. Fluororubber has excellent chemical corrosion resistance, high temperature resistance and oil resistance, and can maintain good sealing performance in harsh environments. Silicone rubber has good flexibility and aging resistance and can adapt to different working conditions. In a high temperature environment, the fluororubber seal can work stably for a long time at a high temperature of 200°C, effectively preventing coolant leakage. Adding nanoparticles, such as nano-silicon dioxide, nano-alumina, etc., to the material can enhance the mechanical properties and sealing performance of the sealing material. The nanoparticles are evenly dispersed in the sealing material, can fill tiny pores, improve the density of the material, and reduce leakage channels. After the connection between the packaging nut 22 and the threaded rod 21, in the process of tightening the packaging nut 22, the outer shell 1 and the packaging bottom shell 31 are close to each other, and the packaging bottom shell 31 extrudes the packaging air bag 4, and the interaction force between the fixed plate one 23 and the sleeve ring 24 makes the telescopic spring 25 compressed, and the elasticity of the telescopic spring 25 buffers to ensure the stability during the packaging process. In the process of tightening the packaging nut 22, the compression plate 8 compresses the sealing gasket 33, thereby ensuring the sealing between the outer shell 1 and the packaging bottom shell 31. The outer shell 1 can be a semiconductor module. After the packaging air bag 4 is extruded, the gas in the packaging air bag 4 is transported to the inside of the inflatable air bag 9 through the plurality of air holes 81. Through the compression flow of the gas, the inflatable air bag 9 no longer shrinks but starts to expand and becomes larger. One end of the inflatable air bag 9 extends from the inside of the receiving groove 82 and fills the groove 34, so as to ensure the close fit between the inflatable air bag 9 and the groove 34. The elastic deformation between the two fills the gap and blocks the leakage of the cooling liquid, thereby further increasing the sealing during the packaging process and improving the packaging effect. Finally, when the packaging nut 22 is rotated to a certain distance, the packaging positioning between the outer shell 1 and the packaging bottom shell 31 can be completed. The packaging air bag 4 is compressed to a certain extent and remains unchanged, and the packaging air bag 4 and the packaging bottom shell 31 are closely fitted, forming a peripheral sealing ring. By setting multiple layers of sealing barriers, multiple lines of defense are formed, thereby greatly improving the sealing and stability after packaging. In addition, when the sealing effect between the compression plate 8 and the sealing gasket 33 and the inflatable air bag 9 and the groove 34 is poor or a gap is formed due to other factors, the leaked cooling liquid can be collected through the flow guide groove 32 and stored in the reflux cavity 35 through the flow guide hole 321, thereby avoiding the leakage of the cooling liquid and ensuring the reliability of the packaging structure and protecting the external elements. The side of the packaging bottom shell 31 is provided with a liquid adding pipe to facilitate the addition of the cooling liquid. The side of the flow guide hole 321 is provided with a liquid discharge nozzle to facilitate the subsequent discharge of the collected cooling liquid.
[0024] Referring to Figures 4-10 , further, the heat dissipation assembly 5 includes a plurality of fixed rods 52, the plurality of fixed rods 52 are respectively one-to-one corresponding to the insertion rods 7, the fixed rods 52 are fixedly connected with the packaging bottom shell 31, one end of the fixed rod 52 is provided with an insertion slot 53, the inner wall of the insertion slot 53 is slidably connected with the insertion rod 7; the end of the fixed rod 52 away from the insertion slot 53 is provided with a piston cavity 54, the piston cavity 54 is internally provided with a piston rod 51 and a return spring 55, the piston rod 51 is arranged in a “T” shape, the piston rod 51 is slidably connected with the inner wall of the piston cavity 54, and the two ends of the return spring 55 are respectively fixedly connected with one end of the piston rod 51 and the inner wall of the piston cavity 54.
[0025] It should be noted that: in the initial state, inert gas is arranged between one end of the piston rod 51 and the piston cavity 54, when the cooling liquid inside the packaging bottom shell 31 generates high heat after cooling the components, the gas inside the piston cavity 54 will gradually expand under heat, and then push the piston rod 51 to move in the piston cavity 54, so that one end of the piston rod 51 gradually moves away from the fixed rod 52, and the return spring 55 is stretched, so that the relative position between the piston rod 51 and the fixed rod 52 changes, so as to increase the heat dissipation area, when the temperature decreases, the gas contracts and recovers, and the return spring 55 resets the piston rod 51 through elastic recovery, and returns to the initial state, in this way, the heat dissipation structure can be automatically adjusted according to the temperature change, and the heat dissipation efficiency is improved, and the piston rod 51, the fixed rod 52 and the plug rod 7 are made of materials with good heat conductivity and corrosion resistance, which can not only improve the heat dissipation effect of the packaging assembly 3 itself, but also effectively prolong the service life of the cooling liquid.
[0026] It should be noted that the specific model and specification of the motor need to be selected and determined according to the actual specification of the device, and the specific selection calculation method adopts the existing technology in the art, so it will not be described in detail.
[0027] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A liquid-cooled power module packaging device, comprising an outer shell (1), wherein a lining plate (6) is provided inside the outer shell (1), characterized in that: The side wall of the outer shell (1) is provided with a packaging airbag (4) and an extrusion plate (8), wherein the extrusion plate (8) is connected to an expansion airbag (9), and further comprises: A packaging component (3), the packaging component (3) is connected to the outer shell (1), and the packaging component (3) is used to seal the coolant; A fastening assembly (2), the fastening assembly (2) being located on one side of the outer shell (1) and the packaging assembly (3), and the fastening assembly (2) being used to connect the outer shell (1) and the packaging assembly (3); A heat removal component (5) is connected to the packaging component (3), and the heat removal component (5) is used to promote cooling of the packaging component (3).
2. The liquid-cooled power module packaging device according to claim 1, characterized in that: The outer shell (1) is fixedly connected to the lining plate (6), and a plurality of insertion rods (7) distributed in a circumferential array are fixedly connected to the side wall of the lining plate (6). The side wall of the outer shell (1) is fixedly connected to the packaging airbag (4) and the extrusion plate (8), respectively. The extrusion plate (8) is located on the inner side of the packaging airbag (4). The side wall of the extrusion plate (8) is provided with a receiving groove (82), and the receiving groove (82) is in the shape of a "U". The inner wall of the receiving groove (82) is fixedly connected to the expansion airbag (9).
3. The liquid-cooled power module packaging device according to claim 2, characterized in that: A plurality of vent holes (81) distributed in a linear array are provided on both sides of the extrusion plate (8), one end of the vent hole (81) is connected to the packaging airbag (4), and the end of the vent hole (81) away from the packaging airbag (4) is connected to the side wall of the expansion airbag (9).
4. The liquid-cooled power module packaging device according to claim 1, characterized in that: The packaging assembly (3) comprises a packaging bottom shell (31), a side wall of the packaging bottom shell (31) is provided with a guide groove (32), the guide groove (32) is arranged in a "U" shape, a reflux cavity (35) is provided inside the packaging bottom shell (31), and the inner walls on both sides of the guide groove (32) are provided with a plurality of guide holes (321) distributed in a linear array, and one end of the guide hole (321) is connected to the reflux cavity (35).
5. The liquid-cooled power module packaging device according to claim 4, characterized in that: A sealing gasket (33) is fixedly connected to the side wall of the packaging bottom shell (31), the sealing gasket (33) is located inside the guide groove (32), and a groove (34) is formed on the side wall of the sealing gasket (33).
6. The liquid-cooled power module packaging device according to claim 2, characterized in that: The heat dissipation assembly (5) includes a fixing rod (52), wherein a plurality of the fixing rods (52) are provided, and the plurality of the fixing rods (52) correspond to the insertion rods (7) one by one. The fixing rods (52) are fixedly connected to the packaging bottom shell (31), and a slot (53) is provided at one end of the fixing rod (52), and the inner wall of the slot (53) is slidably connected to the insertion rod (7).
7. The liquid-cooled power module packaging device according to claim 6, characterized in that: A piston cavity (54) is formed at one end of the fixing rod (52) away from the slot (53). A piston rod (51) and a return spring (55) are provided inside the piston cavity (54). The piston rod (51) is arranged in a "T" shape. The piston rod (51) is slidably connected to the inner wall of the piston cavity (54). The two ends of the return spring (55) are fixedly connected to one end of the piston rod (51) and the inner wall of the piston cavity (54), respectively.
8. The liquid-cooled power module packaging device according to claim 4, characterized in that: The fastening assembly (2) comprises a fixing plate 1 (23) and a fixing plate 2 (26), wherein the fixing plate 1 (23) is fixedly connected to the side wall of the outer shell (1), and the fixing plate 2 (26) is fixedly connected to the side wall of the packaging bottom shell (31), and the side wall of the fixing plate 2 (26) is fixedly connected to a threaded rod (21), and the outer wall of the threaded rod (21) is provided with a telescopic spring (25), one end of the telescopic spring (25) is fixedly connected to the side wall of the fixing plate 2 (26), and the other end of the telescopic spring (25) is fixedly connected to a collar (24), and the collar (24) is sleeved on the outer side of the threaded rod (21), and the threaded rod (21) is threadedly connected to a packaging nut (22).
9. The method for operating a liquid-cooled power module packaging device according to any one of claims 1 to 8, wherein: The following steps are involved: S1: First, when connecting the outer shell (1) and the packaging bottom shell (31), the plurality of threaded rods (21) are respectively passed through the corresponding fixing plate 1 (23), and the insertion rod (7) is inserted into the corresponding slot (53), and the extrusion plate (8) is aligned with the sealing gasket (33); S2: Subsequently, the outer shell (1) and the packaging bottom shell (31) are squeezed, and the packaging bottom shell (31) squeezes the packaging airbag (4), and at the same time, the telescopic spring (25) is compressed through the interaction force between the fixing plate (23) and the collar (24); S3: Finally, the packaging nut 22 is tightened onto the outer wall of the threaded rod (21), and in this process, the expansion airbag (9) is filled into the groove (34), and at the same time, the packaging bottom shell (31) and the packaging airbag (4) are tightly connected, thereby completing the packaging process.