CN107702602B

CN107702602B - MEMS initiating explosive device transduction element ignition capability test device

Info

Publication number: CN107702602B
Application number: CN201710751257.4A
Authority: CN
Inventors: 张文超; 郑子龙; 秦志春; 田桂蓉; 叶家海; 俞春培; 陈亮
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2017-08-28
Filing date: 2017-08-28
Publication date: 2020-06-26
Anticipated expiration: 2037-08-28
Also published as: CN107702602A

Abstract

The invention discloses an ignition capability test device for an energy conversion element of an MEMS initiating explosive device. The energy conversion element packaging device is placed at the bottom of the shell, the bottom end face of the inner sleeve is tightly attached to the top end face of the energy conversion element packaging device, ignition powder is pressed in the inner sleeve, and the gap ignition distance is changed by controlling the distance between the lower surface of the ignition powder and the bottom end face of the inner sleeve. The ignition clearance is accurately controlled by adjusting the positioning column, the structure is simple, and the operation is simple and convenient; the size of the ignition gap is used for indirectly representing the ignition capacity of the MEMS initiating explosive device energy conversion element, the ignition capacity of the MEMS initiating explosive device energy conversion element is semi-quantized, and the method is another important reference for considering the performance of the MEMS initiating explosive device energy conversion element.

Description

MEMS initiating explosive device transduction element ignition capability test device

Technical Field

The invention belongs to the field of testing of the performance of an energy conversion element of an electric initiating explosive device, and particularly relates to an ignition capability testing device of an energy conversion element of an MEMS initiating explosive device.

Background

The electric initiating explosive device energy conversion element is an element which converts electric energy into heat energy in an electric initiating explosive device so as to heat an initiating explosive agent to fire the initiating explosive device. Common transducer elements of electric initiating explosive devices include bridgewire transducer elements, metal ignition bridge transducer elements and semiconductor bridge transducer elements.

The ignition capability of the transducer element of the electric initiating explosive device is a very important basis for considering the transducer element and is an important basic parameter measured in the research and development and production processes. The ignition capacity of the energy conversion element of the electric initiating explosive device directly reflects the performance of the energy conversion element.

With the continuous development of the fourth generation Micro Electro Mechanical System (MEMS) initiating explosive device, the requirements on the energy conversion element are also continuously improved, wherein the structural miniaturization and production integration are the main characteristics of the novel energy conversion element matched with the MEMS initiating explosive device, and the low-energy ignition, high-energy output and controllable energy conversion are the important development directions of the novel MEMS initiating explosive device energy conversion element. For the novel MEMS initiating explosive device energy conversion element, the performance test indexes comprise resistance size, safe current, full firing current, safe voltage, full firing voltage, firing energy and firing time, in addition, the temperature in the firing process and the flame change condition obtained by high-speed photography are also important characteristics of the novel MEMS initiating explosive device energy conversion element, and a unified test method for the ignition capacity of the novel MEMS initiating explosive device energy conversion element does not exist.

Disclosure of Invention

The invention aims to provide a testing device capable of reliably representing the ignition capability of an energy conversion element of an MEMS initiating explosive device. The testing device uses the size of the ignition gap to represent the strength of the ignition capability, and indirectly quantifies the ignition capability of the energy conversion element of the MEMS initiating explosive device.

The technical solution for realizing the purpose of the invention is as follows:

an ignition capability test device for an energy conversion element of an MEMS initiating explosive device comprises the energy conversion element, an ignition powder, a shell, an energy conversion element packaging device and an inner sleeve which are fixedly connected. The energy conversion element is packaged in the energy conversion element packaging device and placed at the bottom of the shell, the bottom end face of the inner sleeve is tightly attached to the top end face of the energy conversion element packaging device, ignition powder is pressed in the inner sleeve, and the gap ignition distance is changed by controlling the distance between the lower surface of the ignition powder and the bottom end face of the inner sleeve.

Preferably, the distance between the lower surface of the ignition powder and the bottom end face of the inner sleeve is controlled by a powder pressing die with a positioning column during the pressure mounting of the ignition powder, the powder pressing die comprises a die base with the positioning column, a protective sleeve, an inner sleeve and a punch, the diameter of the positioning column is the same as the inner diameter of the inner sleeve, the inner sleeve and the positioning column are in tolerance fit during the pressure mounting of the ignition powder, the inner sleeve is sleeved above the positioning column, the protective sleeve is added outside the inner sleeve, the inner sleeve is prevented from inclining, and the gap ignition distance is determined by the height h of.

Preferably, the transducer element packaging device is a cylindrical insulating device and is used for packaging the transducer element and introducing a pin wire to form a power-on loop; the transducer element packaging device is in sliding fit with the shell and is made of ceramic, glass, hard plastic or rubber.

Preferably, the fixedly connected outer shell, the energy conversion element packaging device and the inner sleeve are fixed through a fixing nut with a hole.

Preferably, the bottom of the shell is provided with a small hole so as to facilitate the outer pin wire of the transducer element.

Preferably, the ignition charge is a conventional pyrotechnic charge, such as B/KNO₃、Zr/Pb₃O₄、B/BaCrO₄. The amount of the ignition powder is 10-50 mg, and the pressing pressure is 20-80 MPa.

Compared with the prior art, the invention has the following advantages:

1. the invention is a simple combination of the shell, the inner sleeve, the shell, the energy conversion element packaging device and the inner sleeve, has simple structure and convenient operation, and the shell, the inner sleeve and the like can be repeatedly used;

2. the invention utilizes the height of the die base h to control the distance of gap ignition, and is accurate and adjustable;

3. the invention indirectly represents the ignition capability of the energy conversion element of the MEMS initiating explosive device by using the size of the ignition gap, semi-quantifies the ignition capability of the energy conversion element of the MEMS initiating explosive device, and is an important reference for considering the performance of the energy conversion element of the MEMS initiating explosive device.

Drawings

Fig. 1 is a schematic structural diagram of an ignition capability testing apparatus according to the present invention.

Fig. 2 is a schematic structural view of a pressing mold matched with the ignition capability testing device.

FIG. 3 is a cross-sectional view of a mold base with locating posts in accordance with the present invention.

Fig. 4 is a sectional view of a fixing nut of the ignitability test apparatus of the present invention.

Fig. 5 is a sectional view of the inner sleeve for press-fitting the ignition charge of the ignitability testing apparatus of the present invention.

Fig. 6 is a sectional view of the casing of the ignitability test apparatus of the invention.

Fig. 7 is a schematic structural view of a ceramic plug of the ignitability test apparatus of the present invention.

FIG. 8 shows a semiconductor bridge and Co of the present invention₃O₄a/Al reaction type semiconductor bridge gap ignition test result chart.

The device comprises a semiconductor bridge energy conversion element 1, a shell 2, a ceramic plug 3, an inner sleeve 4, an ignition powder 5, a fixing nut 6, a positioning column 7, a base 8, a protective cylinder 9, a punch 10 and a leg wire 11.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.

As shown in figures 1-7, the device for testing the ignition capability of the energy conversion element of the MEMS initiating explosive device comprises a semiconductor bridge energy conversion element 1 and a B/KNO₃Ignition powder 5, fixedly connected shell 2, ceramic plug 3 and inner sleeve 4, semiconductor bridge energy conversion element 1 is packaged in ceramic plug 3 and placed at the bottom of shell 2, the bottom end face of inner sleeve 4 is tightly attached to the top end face of ceramic plug 3, and B/KNO is pressed in inner sleeve 4₃ Ignition powder 5 by controlling B/KNO₃The distance l between the lower surface of the ignition charge 5 and the bottom end surface of the inner sleeve 4 changes the gap ignition distance l + l₀。

B/KNO₃The distance l between the lower surface of the ignition charge 5 and the bottom end surface of the inner sleeve 4 is pressed B/KNO₃The ignition powder 5 is controlled by a powder pressing die with a positioning column 7, the powder pressing die comprises a die base 8 with the positioning column 7, a protective barrel 9, an inner sleeve 4 and a punch 10, the diameter of the positioning column 7 is the same as the inner diameter of the inner sleeve 4, and B/KNO (boron nitride oxide) is pressed and installed₃When the ignition powder 5 is used, the inner sleeve 4 is in tolerance fit with the positioning column 7 and is sleeved above the positioning column 7, the protective barrel 9 is added outside the inner sleeve 4 to prevent the inner sleeve 4 from inclining, and the height h of the positioning column is equal to B/KNO₃The distance l between the lower surface of the ignition charge 5 and the bottom end surface of the inner sleeve 4.

The ceramic plug 3 is in sliding fit with the shell 2 and is used for packaging the semiconductor bridge energy conversion element 1, and the pin wire 11 is introduced to form a power-on loop; distance l between the surface of the semiconductor bridge transducer element 1 and the upper surface of the ceramic plug 3₀0.7mm, in this example the semiconductor bridge transducer 1 and the B/KNO₃The distance of the bottom end face of the ignition charge 5 is l +0.7mm, i.e., the gap ignition distance is l +0.7 mm.

The fixedly connected shell 2, the ceramic plug 3 and the inner sleeve 4 are fixed by a fixing nut 6 with a hole, and the bottom of the shell 2 is provided with a small hole so as to facilitate the external connection pin of the semiconductor bridge energy conversion element 1Wire 11, press-fitting B/KNO₃The dosage of the ignition powder is 20mg, and the pressing pressure is 60 MPa.

For polysilicon semiconductor bridge and Co under capacitor discharge condition₃O₄The results of the ignition capability test comparison of the/Al reaction type semiconductor bridge are shown in FIG. 8, with an ignition capacitance of 47. mu.F and a discharge voltage of 45V. After the polysilicon semiconductor bridge is ignited, high-temperature plasma is generated, and surrounding initiating explosive is ignited in a micro-convection mode, but the process is greatly influenced by the ignition distance, and the polysilicon semiconductor (hollow five-pointed star) can ignite B/KNO₃The maximum ignition gap of (2) is 0.7 mm. When a layer of 3DOM-Co is integrated in the bridge region of the polysilicon semiconductor₃O₄After the Al nano thermite film, the semiconductor bridge can utilize Al and Co₃O₄The particles are subjected to thermite reaction to enhance the output capacity. As shown in FIG. 8, Co₃O₄The maximum ignition gap of the/Al reactive semiconductor bridge (black-filled five-pointed star) reaches 3.7 mm. Thus, it can be judged that Co₃O₄The ignition capability of the/Al reactive semiconductor bridge is greater than that of the polycrystalline silicon semiconductor bridge.

Claims

1. The device is characterized by comprising a transduction element, ignition powder, a fixedly connected shell, a transduction element packaging device and an inner sleeve, wherein the transduction element packaging device is placed at the bottom of the shell, the bottom end face of the inner sleeve is tightly attached to the top end face of the transduction element packaging device, ignition powder is pressed in the inner sleeve, the fixedly connected shell, the transduction element packaging device and the inner sleeve are fixed by using a fixing nut with a hole, and the distance between the lower surface of the ignition powder and the bottom end face of the inner sleeve is controlled by replacing a pressing powder die base with a positioning column, so that the gap ignition distance is changed; the pressing die comprises a die base with a positioning column, a protective barrel, an inner sleeve and a punch, wherein the positioning column and the die base are integral parts, the diameter of the positioning column is the same as the inner diameter of the inner sleeve, the inner sleeve and the positioning column are in tolerance fit when the ignition powder is pressed and installed, the inner sleeve is sleeved above the positioning column, the protective barrel is added outside the inner sleeve, the inner sleeve is prevented from inclining, and the gap ignition distance is controlled by the height h of the positioning column.

2. The device for testing the ignition capability of the energy conversion element of the MEMS initiating explosive device according to claim 1, wherein the energy conversion element packaging device is a cylindrical insulating device and is used for packaging the energy conversion element, and a pin wire is introduced to form a power-on loop.

3. The device for testing the ignitability of the transducer of the MEMS initiating explosive device according to claim 1, wherein the transducer packaging device is in sliding fit with the housing and is made of ceramic, glass, hard plastic or rubber.

4. The device for testing the ignitability of the transducer of the MEMS initiating explosive device according to claim 1, wherein the fixing nut with the hole is provided with an exhaust hole in the middle.

5. The device for testing the ignition capability of the energy conversion element of the MEMS initiating explosive device according to claim 1, wherein a small hole is formed in the bottom of the shell so as to connect a pin wire outside the energy conversion element.

6. The device for testing the ignitability of the transducer of the MEMS initiating explosive device according to claim 1, wherein the ignition charge is B/KNO₃、Zr/Pb₃O₄、B/BaCrO₄In the ignition powder, the dosage of the ignition powder is 10-50 mg, and the pressing pressure is 20-80 MPa.