Protective structure of micro inertial measurement unit

Abstract

The invention discloses a protection structure of a micro-inertial measurement unit in the field of shock resistance and vibration reduction protection of the micro-inertial measurement unit, and aims to solve the problem that the micro-inertial measurement unit is easily influenced by vibration and high overload due to lack of a corresponding protection structure in the prior art. The method comprises the steps that a cross-medium structure composed of a buffer shell and a shell is arranged outside a micro-inertial measurement unit to weaken vibration waves, and an energy absorption and vibration reduction pad and the buffer shell cooperate to reduce the residual vibration influence on the micro-inertial measurement unit; the wedge-shaped energy absorption and vibration reduction block reduces the deformation of the buffer shell by buffering the overload pressure of the micro inertial measurement unit so as to maintain the buffer capacity of the buffer shell, the outer shell controls the deformation of the buffer shell from the outer side, and the energy absorption and vibration reduction pad improves the overload resistance and vibration resistance of the micro inertial measurement unit in other directions.

Description

Technical Field

[0001] The invention relates to a protective structure of a micro inertial measurement unit, and belongs to the field of anti-impact and vibration reduction protection of micro inertial measurement units. Background Art

[0002] Micro inertial measurement units (MEMS), represented by micro inertial measurement units, can be installed on moving objects to provide functions such as information collection, detection, and guidance. The internal components of the micro inertial measurement unit are relatively delicate. At the same time, the movement mode of the moving object has a severe impact on the micro-electromechanical devices, such as launch vibration, engine operating vibration, launch high overload, and acceleration high overload. As a result, the current micro inertial measurement unit lacks corresponding protection structure, making it vulnerable to vibration and high overload. Summary of the invention

[0003] The purpose of the present application is to overcome the deficiencies in the prior art and to provide a protective structure for a micro inertial measurement unit that reduces the effects of vibration and high overload.

[0004] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: The present application provides a protection structure of a micro inertial measurement unit, comprising: A buffer shell, wherein the micro inertial measurement unit is installed inside the buffer shell, an energy absorbing and vibration reducing pad is arranged on the first side of the buffer shell; each shell edge on the second side of the buffer shell is respectively inserted with a wedge-shaped energy absorbing and vibration reducing block inwardly; the first side and the second side of the buffer shell are arranged along a first axis; An outer shell body, wherein the interior of the outer shell body is used for installing the buffer shell.

[0005] In some embodiments of the present application, the first bottom surface of the wedge-shaped energy absorbing and vibration damping block abuts against the micro-inertial measurement unit, the first top surface of the wedge-shaped energy absorbing and vibration damping block abuts against the inner wall of the outer shell shell, and the first inclined surfaces of multiple wedge-shaped energy absorbing and vibration damping blocks are distributed along the radial direction from the center of the second side to the edge of the shell.

[0006] In some embodiments of the present application, the buffer shell includes a prism located on the second side, the second bottom surface of the prism abuts the inner wall of the outer shell, the second top surface of the prism abuts the micro inertial measurement unit, and the second inclined surface of the prism cooperates with the first inclined surface of the energy absorbing and vibration damping block.

[0007] In some embodiments of the present application, the material of the wedge-shaped energy absorbing and vibration damping block and / or the energy absorbing and vibration damping pad includes foamed aluminum.

[0008] In some embodiments of the present application, the energy absorbing and vibration damping pad is centrally arranged on the first side of the buffer shell, and the energy absorbing and vibration damping pad has two ends respectively abutting against the inner wall of the outer shell and the column of the micro inertial measurement unit.

[0009] In some embodiments of the present application, the buffer shell further includes a detachable buffer cover plate, and the energy absorbing and vibration reducing pad is arranged on the buffer cover plate.

[0010] In some embodiments of the present application, the housing shell includes a detachable housing cover plate, and the housing cover plate corresponds to the buffer cover plate in position.

[0011] In some embodiments of the present application, a plurality of structural bends are provided on the outer surface of the shell shell, the extension direction of the structural bends is parallel to the first axis, and a mounting hole is provided in the structural bends.

[0012] In some embodiments of the present application, the micro inertial measurement unit includes internal devices and circuit modules that are encapsulated and fixed by an encapsulation material layer.

[0013] In some embodiments of the present application, the sub-devices and circuit modules of the internal devices and circuit modules are connected by flexible conductive tapes.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The protective structure of the micro-inertial measurement unit provided in the present application weakens the vibration wave by arranging a cross-medium structure composed of a buffer shell and an outer shell outside the micro-inertial measurement unit, and uses the energy-absorbing and vibration-damping pad and the buffer shell to cooperate with each other to reduce the residual vibration influence on the micro-inertial measurement unit; the wedge-shaped energy-absorbing and vibration-damping block reduces the deformation of the buffer shell by buffering the overload pressure of the micro-inertial measurement unit, thereby maintaining the buffering capacity of the buffer shell, and the outer shell also controls the deformation of the buffer shell from the outside, and the energy-absorbing and vibration-damping pad improves the overload and vibration resistance of the micro-inertial measurement unit in other directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 is a schematic diagram of the external structure of the protection structure of the micro inertial measurement unit provided in this embodiment; Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of ; Figure 3yes Figure 1 Exploded diagram of In the figure: 1, shell cover; 2, fixing screws; 3, energy absorption and vibration reduction pad; 4, buffer cover; 5, micro inertial measurement unit; 51, potting material layer; 52, internal components and circuit modules; 6, buffer shell; 7, wedge-shaped energy absorption and vibration reduction block; 8, shell; 7.1, first bottom surface; 7.2, first top surface; 7.3, first inclined surface; 8.1. Structural bending; 8.2. Mounting hole; 6.1. Prism. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of this application / this application to clearly and completely describe the technical solutions in the embodiments of this application / this application. Obviously, the described embodiments are only part of the embodiments of this application / this application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the application / this application and its application or use. Embodiment 1

[0018] This embodiment provides a protection structure of a micro inertial measurement unit to solve the problem in the prior art that the micro inertial measurement unit is easily affected by vibration and high overload.

[0019] refer to Figures 1 to 3 The protective structure of the micro inertial measurement unit provided in this embodiment includes a buffer shell 6, the micro inertial measurement unit 5 is installed inside the buffer shell 6, and an energy absorption and vibration reduction pad 3 is arranged on the first side of the buffer shell 6; each shell edge on the second side of the buffer shell 6 is respectively inserted inwardly into a wedge-shaped energy absorption and vibration reduction block 7; the first side and the second side of the buffer shell 6 are arranged along the first axis; and also includes an outer shell 8, the inner part of the outer shell 8 is used to install the buffer shell 6.

[0020] When in use, the packaged micro inertial measurement unit 5 is installed and embedded in the interior of the buffer shell 6, and then the buffer shell 6 is installed and embedded in the inner wall of the outer shell 8. Thereafter, the outer shell 8 is installed on a carrier (such as guided ammunition, drone), and the first axis is kept consistent with the movement direction of the carrier as much as possible, and the first side of the buffer shell 6 is facing the head of the carrier. When the carrier is launched or accelerated, the micro-inertial measurement unit 5 generates a high overload along the first axis, and the buffer shell 6 surrounding the surface of the micro-inertial measurement unit 5 will have a buffering effect on the micro-inertial measurement unit 5, and the second side of the buffer shell 6 supports the micro-inertial measurement unit 5 in the high overload state; secondly, the overload pressure applied by the micro-inertial measurement unit 5 to the buffer shell 6 can be divided into two parts. The main overload pressure on the second side of the buffer shell 6 is directly transmitted to the carrier through the outer shell 8, and the micro-inertial measurement unit 5 is supported by the reaction force of the carrier; part of the overload pressure on the second side of the buffer shell 6 near the shell edge is absorbed by the wedge-shaped energy-absorbing and vibration-damping block 7, which absorbs the overload pressure of the micro-inertial measurement unit 5 by slight deformation and displacement of the wedge surface relative to the buffer shell 6. When the carrier passes the initial stage of launch or the acceleration slows down, the deformation of the wedge-shaped energy-absorbing and vibration-damping block 7 is restored. The shell edge of the buffer shell 6 is susceptible to stress concentration and deformation due to the overload pressure of the micro-inertial measurement unit 5, and the wedge-shaped energy-absorbing and vibration-damping block 7 is used to control the overload pressure toward the shell edge, prevent the shell edge of the buffer shell 6 from excessive deformation, and thus ensure the overload protection of the buffer shell 6. When the carrier decelerates under large overload, the energy-absorbing and vibration-damping pad 3 arranged on the first side of the buffer shell 6 will play a similar role as the wedge-shaped energy-absorbing and vibration-damping block 7, buffering the overload pressure, reducing the deformation of the buffer shell 6, and promoting the overall protection of the micro-inertial measurement unit 5 by the protective structure as a whole.

[0021] The carrier will also vibrate during launch or when the engine is running. Since the micro-inertial measurement unit 5 and the carrier are separated from the inside to the outside by a buffer shell 6 and an outer shell 8, the transmission of vibration waves across the medium will weaken the amplitude of the vibration waves, thereby reducing the influence of the carrier vibration on the micro-inertial measurement unit 5. The energy-absorbing and vibration-damping pad 3 and the wedge-shaped energy-absorbing and vibration-damping block 7 can also work together on both sides of the buffer shell 6 to weaken the remaining vibration influence along the first axis.

[0022] In summary, the protective structure of the micro inertial measurement unit provided in this embodiment weakens the vibration wave by arranging a cross-medium structure composed of a buffer shell 6 and an outer shell 8 outside the micro inertial measurement unit 5, and uses the energy-absorbing and vibration-damping pad 3 and the buffer shell 6 to cooperate to reduce the residual vibration influence on the micro inertial measurement unit 5; the wedge-shaped energy-absorbing and vibration-damping block 7 reduces the deformation of the buffer shell 6 by buffering the overload pressure of the micro inertial measurement unit 5, thereby maintaining the buffering capacity of the buffer shell 6, and the outer shell 8 also controls the deformation of the buffer shell 6 from the outside, and the energy-absorbing and vibration-damping pad 3 improves the overload and vibration resistance of the micro inertial measurement unit 5 in other directions. Embodiment 2

[0023] This embodiment provides a protective structure for a micro inertial measurement unit. This embodiment is optimized on the basis of the first embodiment to improve the technical effect and refine the technical solution. For the contents not fully described in this embodiment, please refer to the first embodiment.

[0024] refer to Figure 2 As one of the embodiments, the wedge-shaped energy absorbing and vibration damping block 7 is inserted upside down into the buffer shell 6, and the first bottom surface 7.1 of the wedge-shaped energy absorbing and vibration damping block 7, that is, the bottom surface with the largest area, abuts against the micro inertial measurement unit 5 to fully withstand the overload pressure of the micro inertial measurement unit 5. The first top surface 7.2 of the wedge-shaped energy absorbing and vibration damping block 7 abuts against the inner wall of the outer shell 8, and the first inclined surfaces 7.3 of the plurality of wedge-shaped energy absorbing and vibration damping blocks 7 are distributed along the radial direction from the center of the second side to the edge of the shell. The overload pressure generated by the micro-inertial measurement unit 5 on the non-central position of the second side of the buffer shell 6 is gathered into the wedge-shaped energy absorbing and vibration damping block 7 through the first bottom surface 7.1. Part of the overload pressure drives the wedge-shaped energy absorbing and vibration damping block 7 to compress, and the other part is transmitted to the inner wall of the outer shell 8 through the first top surface 7.2. Since the first inclined surfaces 7.3 of multiple wedge-shaped energy absorbing and vibration damping blocks 7 are distributed along the radial direction from the center of the second side to the edge of the shell, the overload pressure generated by the micro-inertial measurement unit 5 on the non-central position of the second side of the buffer shell 6 is converted into a compression force on the energy absorbing and vibration damping block 7 and a lateral extrusion force of the energy absorbing and vibration damping block 7 on the outer shell 8, thereby reducing the influence of the micro-inertial measurement unit 5 on the buffer shell 6 and forming protection for the edges of the shell.

[0025] As one example, refer to Figure 2 and Figure 3 The buffer shell 6 includes a prism 6.1 located on the second side, the second bottom surface of the prism 6.1 abuts against the inner wall of the outer shell 8, the second top surface of the prism 6.1 abuts against the micro-inertial measurement unit 5, and the second inclined surface of the prism 6.1 cooperates with the first inclined surface 7.3 of the energy absorbing and damping block 7. The main pressure overload generated by the micro-inertial measurement unit 5 on the buffer shell 6 is transmitted to the outer shell 8 and the carrier at the bottom through the prism 6.1. When the prism 6.1 is deformed under a large overload pressure, the second inclined surface of the prism 6.1 will produce an extrusion effect on the first inclined surface 7.3 of the energy absorbing and damping block 7. The energy absorbing and damping block 7 is used to buffer the deformation of the prism 6.1. The energy absorbing and damping block 7 will also generate an upward reaction force along the direction of the first inclined surface 7.3. This reaction force can offset the overload pressure generated by the micro-inertial measurement unit 5 on the edge of the buffer shell 6.

[0026] As one embodiment, the material of the wedge-shaped energy absorbing and vibration damping block 7 and the energy absorbing and vibration damping pad 3 includes foamed aluminum. The energy absorption density of foamed aluminum reaches 4~20J / cm³, and it has excellent energy absorption and buffering capacity. When impacted, foamed aluminum can effectively absorb and disperse the impact energy through its porous structure, thereby protecting the impacted object from damage. In addition, the specific stiffness of foamed aluminum (that is, the ratio of the stiffness of the material to its density) is high, and its bending specific stiffness is 1.5 times that of steel. Selecting foamed aluminum as the main material of the wedge-shaped energy absorbing and vibration damping block 7 and the energy absorbing and vibration damping pad 3 can reduce its own overload pressure.

[0027] As one of the embodiments, the energy absorbing and vibration damping pad 3 is centrally arranged on the first side of the buffer shell 6. The energy absorbing and vibration damping pad 3 uses a column with high force transmission efficiency, and its two ends respectively abut the inner wall of the outer shell 8 and the column of the micro-inertial measurement unit 5. When the carrier is decelerated or the micro-inertial measurement unit 5 is subjected to other reverse impacts, the energy absorbing and vibration damping pad 3 is used to concentrate on absorbing the overload pressure of the micro-inertial measurement unit 5. The energy absorbing and vibration damping pad 3 and the wedge-shaped energy absorbing and vibration damping block 7 are respectively located on both sides of the first axis and the wedge-shaped energy absorbing and vibration damping block 7 is closer to the shell edge than the energy absorbing and vibration damping pad 3, so the energy absorbing and vibration damping pad 3 and the wedge-shaped energy absorbing and vibration damping block 7 can complement each other to absorb the vibration of the micro-inertial measurement unit 5.

[0028] As one example, Figure 1 , Figure 2 and Figure 3 The protective structure of the micro-inertial measurement unit provided in this embodiment is a detachable design. The buffer shell 6 also includes a buffer cover plate 4 detachably connected to the body. The outer shell 8 includes a detachable outer shell cover plate 1. The outer shell cover plate 1 and the buffer cover plate 4 are located in a corresponding position. When in use, the outer shell cover plate 1 and the buffer cover plate 4 should be arranged near the carrier head to avoid the overload pressure of the micro-inertial measurement unit 5 being applied to the outer shell cover plate 1 and the buffer cover plate 4. As one embodiment, refer to Figure 1 and Figure 3 The housing cover 1 is connected to the housing shell 8 body by fixing screws 2 distributed around it.

[0029] As one example, refer to Figure 1 and Figure 3 A plurality of structural bends 8.1 are provided on the outer surface of the shell body 8, and the structural bends 8.1 can enhance the overload resistance along the first axis. The extension direction of the structural bend 8.1 is parallel to the first axis. A mounting hole 8.2 is provided in the structural bend 8.1, and the groove of the structural bend 8.1 also provides an installation space for the mounting hole 8.2. The protective structure can be installed on the carrier through the mounting hole 8.2.

[0030] As one example, refer to Figure 2The micro-inertial measurement unit 5 includes an encapsulating material layer 51 encapsulating and fixing internal components and circuit modules 52. The encapsulating material layer 51, the buffer shell 6, and the outer shell 8 form a three-layer structure for weakening vibration across the medium. The encapsulating material layer 51 also plays a role in fixing the position of the internal components and circuit modules 52 and reducing the impact of overload on the internal components and circuit modules 52.

[0031] As one embodiment, multiple layers of internal devices and circuit modules 52 may be arranged in multiple orientations in the micro inertial measurement unit 5 , and different internal devices and circuit modules 52 may be connected by flexible conductive tapes to reduce the volume of the micro inertial measurement unit 5 .

[0032] As one embodiment, the housing cover 1 is made of metal material.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided at", "provided with", "located", "installed", "set", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. "Hinged" includes "rotational connection".

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A protective structure of a micro inertial measurement unit, characterized in that: include, A buffer shell (6), the interior of the buffer shell (6) being used to mount the micro inertial measurement unit (5), an energy absorbing and vibration reducing pad (3) being arranged on a first side of the buffer shell (6); a wedge-shaped energy absorbing and vibration reducing block (7) being respectively inserted inwardly of each shell edge on a second side of the buffer shell (6); and the first side and the second side of the buffer shell (6) being arranged along a first axis; An outer shell body (8), wherein the interior of the outer shell body (8) is used for mounting the buffer shell body (6).

2. The protective structure of the micro inertial measurement unit according to claim 1, characterized in that: The first bottom surface (7.1) of the wedge-shaped energy absorbing and vibration damping block (7) abuts against the micro-inertial measurement unit (5), the first top surface (7.2) of the wedge-shaped energy absorbing and vibration damping block (7) abuts against the inner wall of the outer shell body (8), and the first inclined surfaces (7.3) of the plurality of wedge-shaped energy absorbing and vibration damping blocks (7) are distributed along a radial direction from the center of the second side to the edge of the shell body.

3. The protective structure of the micro inertial measurement unit according to claim 2, characterized in that: The buffer shell (6) comprises a prism (6.1) located on the second side, the second bottom surface of the prism (6.1) abuts against the inner wall of the outer shell (8), the second top surface of the prism (6.1) abuts against the micro inertial measurement unit (5), and the second inclined surface of the prism (6.1) matches the first inclined surface (7.3) of the energy absorbing and vibration reducing block (7).

4. The protective structure of the micro inertial measurement unit according to claim 1, 2 or 3, characterized in that: The material of the wedge-shaped energy absorbing and vibration-damping block (7) and / or the energy absorbing and vibration-damping pad (3) comprises foamed aluminum.

5. The protective structure of the micro inertial measurement unit according to claim 1, characterized in that: The energy absorbing and vibration damping pad (3) is arranged in the center of the first side of the buffer shell (6); the energy absorbing and vibration damping pad (3) is a column with two ends respectively abutting against the inner wall of the outer shell (8) and the micro inertial measurement unit (5).

6. The protective structure of the micro inertial measurement unit according to claim 1, characterized in that: The buffer shell (6) further comprises a detachable buffer cover plate (4), and the energy absorbing and vibration reducing pad (3) is arranged on the buffer cover plate (4).

7. The protective structure of the micro inertial measurement unit according to claim 6, characterized in that: The outer shell (8) comprises a detachable outer shell cover (1), and the outer shell cover (1) corresponds in position to the buffer cover (4).

8. The protective structure of the micro inertial measurement unit according to claim 1, characterized in that: The outer surface of the outer shell (8) is provided with a plurality of structural bends (8.1), the extension direction of the structural bends (8.1) is parallel to the first axis, and a mounting hole (8.2) is provided in the structural bends (8.1).

9. The protective structure of the micro inertial measurement unit according to claim 1, characterized in that: The micro inertial measurement unit (5) comprises an internal device and a circuit module (52) which are encapsulated and fixed by an encapsulation material layer (51).

10. The protective structure of the micro inertial measurement unit according to claim 1, characterized in that: The sub-devices and circuit modules of the internal device and circuit module (52) are connected via flexible conductive strips.

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