Partition plate donor end integrated sealing structure

Abstract

The utility model relates to a separator donor end integrated sealing structure, which comprises a polyimide film and an aluminum tube shell, the thickness of the polyimide film is uniform and consistent, the thickness range is 10-20 microns, the aluminum tube shell is a thin-wall hollow structure formed by punching plates, the wall thickness is 0.2-0.4 mm, the bottom of the aluminum tube shell is provided with holes, and the hole diameter is 1.5-3 mm. And uniformly coating the polyimide film on the outer side of the bottom of the tube shell through a spin-coating process, and sealing the bottom hole of the tube shell. When the integrated sealing structure is used for the donor end of a partition plate type initiating explosive device, the integrated sealing structure is pressed into the donor end together. According to the utility model, the silk pad sealing material of the donor end of the existing partition plate type initiating explosive device is replaced, the risk of sealing failure of the donor end of the partition plate is reduced, and the environmental adaptability of the product and the reliability of the partition plate type initiating explosive device are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of partition-type pyrotechnic products and relates to an integrated sealing structure of a partition donor end. Background Art

[0002] The donor end of existing partition-type pyrotechnics is sealed by a tube shell and a silk pad. After the silk pad is bonded to the tube shell, it is pressed into the charging hole of the donor end together with the tube shell. Since the silk pad material itself has pores, it is impossible to ensure the complete sealing of the donor end, resulting in the problem of reduced reliability of partition-type pyrotechnics under long-term vibration or high temperature and high humidity environment.

[0003] The article "Analysis of the Cause of Failure of a Certain Explosive Bolt" (Zhao Liang, Hua Qi, Liu Haixu, Qiao Gaixia, Li Weifeng, 2014 Annual Meeting on Failure Analysis of the Ordnance Industry) introduces the cause of the failure of a certain explosive bolt. By dissecting the remains of the explosive bolt, it was found that the donor end of the partition detonator used to detonate the explosive bolt was not detonated. The fault tree method finally confirmed that the donor end of the partition detonator did not detonate due to water ingress during the sealing test, which caused the failure of the explosive bolt. It can be seen that the donor end of the partition-type pyrotechnics has the risk of sealing failure when undergoing environmental testing.

[0004] The article "Application of Pd / Al Energetic Metal Film in Flame Detonator" (Lu Yongwei, Explosives, Issue 2, April 2018) introduces the structural design of using Pd / Al energetic metal film to replace silk pad as the sealing material for the input end of flame detonator. However, the flame sensitivity of the Pd / Al composite metal film is affected by the number of metal layers and the thickness of a single metal layer. The preparation accuracy of the metal film is high, and the influence of the number of metal layers and the thickness of a single metal layer on the flame sensitivity needs to be further explored. In addition, the composite metal film and the reinforcing cap are still bonded by glue, and the control of the bonding quality and the long storage of the glue also need to be studied.

[0005] At present, there are few studies on the sealing design of partition-type pyrotechnics at home and abroad. As the environmental conditions become more severe, the risk of sealing failure at the donor end of the partition becomes more and more obvious. Improving the sealing of the donor end of partition-type pyrotechnics is of great significance to improving the reliability of partition-type pyrotechnics. Utility Model Content

[0006] The technical problem solved by the utility model is: to overcome the shortcomings of the prior art, to propose an integrated sealing structure for the donor end of a partition, to replace the silk pad sealing material at the donor end of the existing partition type pyrotechnics, and to improve the reliability of the partition type pyrotechnics.

[0007] The technical solution of the utility model is: to propose an integrated sealing structure of the donor end of the partition, including a polyimide film and a tube shell. The tube shell is a thin-walled hollow structure formed by stamping a plate, and has a hole at the bottom. The polyimide film is evenly coated on the outside of the bottom of the tube shell by a spin coating process to seal the bottom hole of the tube shell.

[0008] Furthermore, the tube shell is made of aluminum.

[0009] Furthermore, the polyimide film has a uniform thickness ranging from 10 to 20 μm.

[0010] Furthermore, the tube shell wall thickness is 0.2-0.4 mm.

[0011] Furthermore, the diameter of the hole at the bottom of the tube shell is 1.5-3 mm.

[0012] Furthermore, glue is applied between the tube shell and the product shell.

[0013] The beneficial effects of the utility model compared with the prior art are:

[0014] (1) The present invention uses PI film instead of silk pad as the sealing material of the separator donor end, which reduces the risk of sealing failure of the separator donor end and improves the environmental adaptability of the product;

[0015] (2) The present invention integrates the sealing material and the tube shell into an integrated structure, thereby avoiding the use of glue between the sealing material and the tube shell and improving the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of an integrated sealing structure of a partition donor end of the utility model;

[0017] Figure 2 This is a schematic diagram of the assembly of the partition igniter of the utility model;

[0018] Figure 3 This is a flow chart of the spin coating process of the utility model. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Example 1

[0021] like Figure 1As shown, the present embodiment proposes an integrated sealing structure of a partition donor end, comprising a polyimide (PI) film 1 and an aluminum tube shell 2. The polyimide film 1 has a uniform thickness in the range of 10 to 20 μm, and a thickness of 15 μm is selected in the present embodiment; the aluminum tube shell 2 is a thin-walled hollow structure formed by stamping a sheet material, and the wall thickness is preferably 0.3 mm. The bottom of the aluminum tube shell 2 has a hole, and the hole diameter is preferably 2 mm; the polyimide film 1 is evenly coated on the outside of the bottom of the aluminum tube shell 2 by a rotary glue spreading method, thereby sealing the bottom hole of the aluminum tube shell to form an integrated sealing structure.

[0022] The prepared polyimide film 1 has good bonding strength with the aluminum tube shell 2, and the formed integrated sealing structure can solve the problems of glue aging and silk gasket sealing failure caused by the need for additional glue to bond the existing silk gasket sealing sheet to the aluminum tube shell. The preparation process is simple and suitable for large-scale production.

[0023] like Figure 3 As shown, the polyimide film 1 and the aluminum tube shell 2 are made into an integrated structure by a spin coating process, and the spin coating process flow is as follows:

[0024] Clean the aluminum tube shell and put the aluminum tube shell sample into the spin coating tool;

[0025] adding polyimide glue to prepare a polyimide film;

[0026] Solidify and trim to form an integrated structure.

[0027] After the integrated sealing structure of the polyimide film 1 and the aluminum tube shell 2 is formed, when it is applied to a partition-type explosive device, it is only necessary to press the integrated sealing structure together into the donor end of the partition, such as Figure 2 As shown, glue is applied between the aluminum tube shell 2 and the product shell to further ensure the structural strength.

[0028] Although the utility model has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the utility model. Any technical personnel in this field can make possible changes and modifications to the technical solution of the utility model by using the methods and technical contents disclosed above without departing from the spirit and scope of the utility model. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model are within the protection scope of the technical solution of the utility model.

[0029] The contents not described in detail in the utility model specification belong to the common knowledge of those skilled in the art.

Claims

1. A spacer donor end integrated sealing structure, characterized in that: The invention comprises a polyimide film and a tube shell. The tube shell is a thin-walled hollow structure formed by stamping a plate and has a hole at the bottom. The polyimide film is evenly coated on the outer side of the bottom of the tube shell by a spin coating process to seal the bottom hole of the tube shell.

2. The integrated sealing structure of the donor end of the separator according to claim 1, characterized in that: The material of the tube shell is aluminum.

3. The integrated sealing structure of the donor end of the separator according to claim 1, characterized in that: The polyimide film has a uniform thickness ranging from 10 to 20 μm.

4. The integrated sealing structure of the donor end of the separator according to claim 1, characterized in that: The tube shell wall thickness is 0.2-0.4 mm.

5. The integrated sealing structure of the donor end of the separator according to claim 1, characterized in that: The diameter of the hole at the bottom of the tube shell is 1.5-3 mm.

6. The integrated sealing structure of the donor end of the separator according to claim 1, characterized in that: Glue is applied between the tube shell and the product shell.

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