CN221147636U

CN221147636U - Small MEMS navigation attitude system

Info

Publication number: CN221147636U
Application number: CN202323151959.9U
Authority: CN
Inventors: 惠敬; 李鹭; 王敏; 田蓓; 程杰
Original assignee: Avic Shaanxi Huayan Aero Instrument Co ltd
Current assignee: Avic Shaanxi Huayan Aero Instrument Co ltd
Priority date: 2023-11-22
Filing date: 2023-11-22
Publication date: 2024-06-14
Anticipated expiration: 2033-11-22

Abstract

The utility model belongs to the field of MEMS inertial navigation, and relates to a miniaturized MEMS attitude and heading reference system, which comprises a shell, a component mounting reference piece, an MEMS inertial instrument component, a cover plate, a power panel, a resolving plate, a large capacitor and a marine connector, wherein the shell is provided with a plurality of micro-electromechanical systems (MEMS) and is provided with a plurality of micro-electromechanical systems (MEMS) and a plurality of micro-electromechanical systems; the ocean-resistant connector penetrates through the side wall of the shell and is arranged in the shell; the power panel, the resolving board and the MEMS inertial instrument component are sequentially arranged in the shell from top to bottom; the large capacitor is arranged in parallel with the MEMS inertial instrument assembly; the cover plate is arranged on the upper part of the power panel and connected with the shell; the MEMS inertial instrument assembly is connected with the shell through an assembly mounting reference piece; the resolving plate is installed in a staggered manner with the MEMS inertial instrument assembly; the power panel and the resolving panel are installed back to back. The utility model provides a miniaturized MEMS navigation attitude system which can reduce the volume and the weight of a product and can realize the rapid installation of the product.

Description

Small MEMS navigation attitude system

Technical Field

The utility model belongs to the field of MEMS inertial navigation, relates to an MEMS navigation attitude system, and particularly relates to a miniaturized MEMS navigation attitude system.

Background

The attitude and heading reference system is an important airborne navigation device, and is widely applied to the civil and military fields. The navigation attitude system formed by the fiber optic gyroscope has the characteristics of high navigation accuracy, and the products have the defects of large volume, large weight, high power consumption, complex structure, high technical requirements on operators and long product delivery period.

The existing product is mainly used in a land environment for a long time, the requirement on the atmospheric environment of the product is generally low, the service cycle of the product in a marine environment is increased in recent years, once the product is corroded during use, the installation accuracy, the insulation performance and the component performance are affected, and finally the performance and the reliability of the product are reduced. In order to ensure that the appearance quality and performance of the product are not reduced, strict protection measures are required for damp heat, mould, salt mist and acidic atmospheric environment.

Disclosure of utility model

In order to solve the technical problems in the background art, the utility model provides a miniaturized MEMS navigation attitude system which can reduce the volume and the weight of a product and can realize the rapid installation of the product.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

A miniaturized MEMS avionic system comprises a shell, a component mounting reference piece, an MEMS inertial instrument component, a cover plate, a power panel, a resolving plate, a large capacitor and a marine connector; the ocean-resistant connector penetrates through the side wall of the shell and is arranged in the shell; the power panel, the resolving board and the MEMS inertial instrument component are sequentially arranged in the shell from top to bottom; the large capacitor is arranged in parallel with the MEMS inertial instrument assembly; the cover plate is arranged on the upper part of the power panel and is connected with the shell; the MEMS inertial instrument assembly is connected with the shell through an assembly mounting reference piece; the resolving plate and the MEMS inertial instrument component are installed in a staggered manner; the power panel and the resolving panel are installed back to back.

Preferably, the component mounting reference member adopted by the utility model comprises three bosses arranged at the inner bottom of the shell, wherein the three bosses are arranged in a delta shape, and the flatness error of the plane of the upper surfaces of the three bosses is not more than 0.02; the MEMS inertial meter assembly produces a mounting error angle of no more than 0.026 ° on three bosses.

Preferably, when three bosses adopted by the utility model are arranged in a delta shape, the distance between two adjacent bosses is 44mm.

Preferably, the component mounting reference member used in the present utility model further comprises a positioning bar provided at the bottom of the housing, and the MEMS inertial meter component is clamped on the positioning bar and provided at the bottom of the housing through a boss.

Preferably, the resolving board used in the present utility model is provided with a micro rectangular connector facing the MEMS inertial instrument assembly.

Preferably, a power supply board used in the utility model is provided with a power supply module, and the power supply module faces the cover board.

Preferably, the bottom of the shell adopted by the utility model is provided with a flange connection hole, and the flange connection hole comprises a first flange connection hole, a second flange connection hole, a third flange connection hole and a fourth flange connection hole; the distance between the first flange connection hole and the center of the bottom of the shell is L1; the distance between the second flange connection hole and the center of the bottom of the shell is L2; the distance between the third flange connection hole and the center of the bottom of the shell is L3; the distance between the fourth flange connection hole and the center of the bottom of the shell is L4; the L4 > l1=l2=l3.

Preferably, the miniaturized MEMS attitude and heading reference system adopted by the utility model further comprises a capacitor bracket, a support column and a support column; the large capacitor is arranged at the bottom in the shell through a capacitor bracket; the resolving plate is arranged at the inner bottom of the shell through a supporting column; the power panel is arranged on the resolving board through the support posts.

Preferably, the miniaturized MEMS attitude and heading reference system adopted by the present utility model further comprises a socket gasket and a cover plate gasket; the cover plate gasket is arranged between the cover plate and the shell; the marine connector extends through the housing sidewall through the socket liner.

Preferably, the outer surface of the housing and the outer surface of the cover plate used in the present utility model are provided with a corrosion-resistant layer.

Advantageous effects

The utility model has the advantages that:

The utility model provides a miniaturized MEMS attitude and heading reference system, which comprises a shell, a component mounting reference piece, an MEMS inertial instrument component, a cover plate, a power panel, a resolving plate, a large capacitor and a marine connector, wherein the shell is provided with a plurality of components; the ocean-resistant connector penetrates through the side wall of the shell and is arranged in the shell; the power panel, the resolving board and the MEMS inertial instrument component are sequentially arranged in the shell from top to bottom; the large capacitor is arranged in parallel with the MEMS inertial instrument assembly; the cover plate is arranged on the upper part of the power panel and connected with the shell; the MEMS inertial instrument assembly is connected with the shell through an assembly mounting reference piece; the resolving plate is installed in a staggered manner with the MEMS inertial instrument assembly; the power panel and the resolving panel are installed back to back. The utility model utilizes the structural form and position tolerance parameter design method, adopts the component mounting reference piece (the boss and the positioning strip), so that the MEMS inertia instrument component is sensitive and measures three axial angular velocity and three axial acceleration precision more highly, the three circular bosses provide the horizontal plane mounting reference for the MEMS inertia instrument component, the flatness error is not more than 0.02, the horizontal mounting distance is 44mm, the mounting error angle is 0.026 degrees, and the index requirement of the MEMS inertia instrument component is far less than 0.2 degrees. The locating strip provides a mounting reference of a lateral surface for the MEMS inertial instrument assembly, so that the MEMS inertial instrument assembly and the cover plate can be ensured to be consistent in the direction of the machine head, meanwhile, the MEMS inertial instrument assembly can be rapidly placed at a designated position, a certain mounting precision is ensured, and rapid mounting of products is realized. Secondly, by using a structural layout design method, one surface of the resolving board with the micro rectangular connector is downwards installed and mutually staggered with the installation of the MEMS inertial instrument assembly, and the structural characteristics of each part are fully utilized, so that the space between the resolving board and the MEMS inertial instrument assembly can be effectively reduced, the volume of a product is reduced, and the weight of the product is reduced. Finally, the utility model designs the shell into an asymmetric structure by utilizing the structural error-proof design method, and the mounting clearance hole (the product is mounted by adopting M5 screws) on one side is moved outwards by 1mm on the basis of the original completely symmetric mounting clearance hole, so that the product can be ensured to be incapable of being mounted in the directions of 90 DEG, 180 DEG and 270 DEG, and the error-proof design is realized. Obviously, the utility model has reasonable layout, can reduce the height of the product (10 mm is reduced and the ratio is 14.3 percent), and simultaneously reduces the weight of the inertia instrument assembly (about 25g and the ratio is 6.9 percent); the operation is simple, the assembly time of each product can be shortened, and the production efficiency of the product is improved; the error-proof design can avoid the product installation error caused by human error operation when the product is installed, and the product cannot be normally used. The utility model improves and designs the reasonable layout and the selection of the MEMS inertia instrument assembly, the resolving board, the power panel and the large capacitor on the premise of meeting the basic function of the avionic system, optimizes the surface protection coating and other modes, has the advantages of small volume, light weight, low power consumption, simple structure, low technical requirements on operators and the like, shortens the lead time of the avionic product, improves the environment adaptability of the avionic product, and can also realize analog design on the structures of similar products.

Drawings

FIG. 1 is a schematic diagram of an exploded structure of a miniaturized MEMS attitude and heading reference system provided by the present utility model;

FIG. 2 is a schematic view of a miniaturized MEMS attitude and heading reference system (unassembled housing) provided by the present utility model;

FIG. 3 is a schematic view of a housing used in the present utility model;

FIG. 4 is a schematic view of a normal installation of a prior art housing to housing attachment flange;

FIG. 5 is a schematic view of the prior art installation of a housing with a housing attachment flange rotated 90;

FIG. 6 is a schematic view of the prior art installation of a housing with a housing attachment flange rotated 180;

FIG. 7 is a schematic view of the prior art installation of a housing with a housing attachment flange when rotated 270;

In the figure:

1-marine connector; 2-socket pads; 3-capacitor support; 4-large capacitance; 5-supporting columns; 6-MEMS inertial meter assembly; 7-supporting columns; 8-a resolving board; 9-a power panel; 10-cover plate gasket; 11-cover plate; 12-signage; 13-a housing; 14-boss; 15-positioning strips; 16-a first flange connection hole; 17-a second flange connection hole; 18-a third flange connection hole; 19-fourth flange connection holes.

Detailed Description

Referring to fig. 1 and 2, the utility model provides a miniaturized MEMS attitude and heading reference system, comprising a housing 13, a component mounting reference, a MEMS inertial instrument component 6, a cover plate 11, a power panel 9, a resolving board 8, a large capacitor 4 and a marine-resistant connector 1; the marine connector 1 penetrates the side wall of the housing 13 and is placed in the housing 13; the power panel 9, the resolving board 8 and the MEMS inertia instrument assembly 6 are sequentially arranged inside the shell 13 from top to bottom; the large capacitor 4 is arranged in parallel with the MEMS inertial instrument assembly 6; the cover plate 11 is arranged on the upper part of the power panel 9 and is connected with the shell 13; the MEMS inertial instrument assembly 6 is connected with the housing 13 through an assembly mounting reference member; the resolving plate 8 is installed in a staggered manner with the MEMS inertial instrument assembly 6; the power board 9 is mounted back-to-back with the resolving board 8. According to the utility model, by utilizing the structural layout design method, one surface of the resolving board with the micro rectangular connector is downwards installed and is mutually staggered with the installation of the MEMS inertial instrument assembly, the structural characteristics of each part are fully utilized, and the space between the resolving board and the MEMS inertial instrument assembly can be effectively reduced, so that the volume of a product is reduced, and the weight of the product is reduced. Illustratively, one end of the power panel 9 and the resolving panel 8 are identical to the shape of the inner cavity of the shell 13, two sides of the power panel are parallel to the shape of the inner cavity of the shell 13, and the other end is a right-angle side, so that the shape of the inner cavity of the shell 13 can be fully utilized to increase the area of the power panel 9 and the resolving panel 8. The housing 13 is provided with a sign 12.

Referring to fig. 3, the utility model designs and forms a component mounting reference piece by using a structural position tolerance parameter design method, and comprises three bosses 14, particularly circular bosses, arranged at the inner bottom of a shell 13, wherein the three bosses 14 are arranged in a delta shape, and the flatness error of the plane of the upper surfaces of the three bosses 14 is not more than 0.02; the MEMS inertial meter assembly 6 creates a mounting error angle on the three bosses 14 of no more than 0.026 °. When the three bosses 14 are arranged in a delta shape, the distance between two adjacent bosses 14 is 44mm. The three bosses 14 make the MEMS inertial meter assembly sensitive and measure the angular rate of the three axial directions and the higher the acceleration accuracy of the three axial directions, the three circular bosses 14 provide a horizontal mounting reference for the MEMS inertial meter assembly. Meanwhile, the assembly mounting reference piece further comprises a positioning strip 15 arranged at the inner bottom of the shell 13, and the MEMS inertia meter assembly 6 is clamped on the positioning strip 15 and is arranged at the bottom of the shell 13 through a boss 14. The positioning strip 15 provides a mounting reference of a lateral surface for the MEMS inertia instrument assembly, can ensure that the orientation of the MEMS inertia instrument assembly and the cover plate is consistent in the machine head direction, can rapidly place the MEMS inertia instrument assembly at a designated position, ensures a certain mounting precision, and realizes rapid mounting of products.

The resolving plate 8 is provided with a micro rectangular connector facing the MEMS inertial instrument assembly 6. The power panel 9 is provided with a power module facing the cover plate 11. That is, the utility model uses the structural layout design method to make the surface of the resolving board 8 with the micro rectangular connector face down to be installed and staggered with the MEMS inertia meter assembly 6, and the utility model can shorten the height direction of the product by 10mm, fully uses the structural characteristics of each part, and can effectively reduce the space between the resolving board 8 and the MEMS inertia meter assembly 6, thereby reducing the volume of the product and the weight of the product.

Referring to fig. 4, 5, 6 and 7, in the prior art, no matter what angle the housing is connected to the housing connecting flange, interference occurs (interference means that the mounting clearance hole on the housing is not concentric with the connecting hole of the housing connecting flange, and a screw cannot be mounted, that is, the two cannot be well connected). In order to solve the problem, the utility model designs the shell into an asymmetric structure by using a structural error-proof design method, and the installation clearance hole (adopting M5 screws to install products) on one side is moved outwards by 1mm on the basis of the original completely symmetric installation clearance hole, so that the products can not be installed in the directions of 90 DEG, 180 DEG and 270 DEG, the error-proof design is realized, and the problem that the products are installed incorrectly and cannot be used normally due to manual error operation when the products are installed is effectively solved. Specifically, referring to fig. 3, the bottom of the housing 13 used in the present utility model is provided with flange connection holes, which include a first flange connection hole 16, a second flange connection hole 17, a third flange connection hole 18, and a fourth flange connection hole 19; the distance from the first flange connection hole 16 to the bottom center of the housing 13 is L1; the distance from the second flange connection hole 17 to the bottom center of the housing 13 is L2; the distance from the third flange connection hole 18 to the bottom center of the housing 13 is L3; the distance from the fourth flange connection hole 19 to the bottom center of the housing 13 is L4; l4 > l1=l2=l3.

The miniaturized MEMS attitude and heading reference system also comprises a capacitor bracket 3, a support column 5 and a support column 7; the large capacitor 4 is arranged at the bottom in the shell 13 through the capacitor bracket 3; the resolving plate 8 is arranged at the bottom inside the shell 13 through the support column 5; the power supply board 9 is provided on the resolving board 8 through the stay 7.

The miniaturized MEMS attitude and heading reference system further comprises a socket gasket 2 and a cover gasket 10; the cover gasket 10 is interposed between the cover 11 and the housing 13; the marine connector 1 extends through the side wall of the housing 13 via the socket liner 2. The internal outgoing line of the product input/output power supply/signal is welded on the plug of the micro-distance connector, and is inserted with the socket of the micro-distance connector of the resolving plate 8, so that the manufacturability of product disassembly and assembly can be improved, the operation is simple, the fixing of other components is only connected in a threaded mode, the integral structure of the product is simple, and the operation is easy.

The outer surface of the shell 13 and the outer surface of the cover plate 11 are provided with corrosion-resistant layers, and as the shell 13 and the cover plate 11 are made of antirust aluminum alloy materials, the surfaces are anodized by sulfuric acid to form the corrosion-resistant layers, and the coating system of H06-3 primer and F04-60 finish paint is adopted, so that the severe marine environments such as damp heat, salt fog, mould, acid atmosphere and the like can be satisfied.

Claims

1. A miniaturized MEMS avionic system is characterized in that: the miniature MEMS attitude and heading reference system comprises a shell (13), a component mounting reference piece, an MEMS inertial instrument component (6), a cover plate (11), a power panel (9), a resolving plate (8), a large capacitor (4) and a marine connector (1); the ocean-resistant connector (1) penetrates through the side wall of the shell (13) and is arranged in the shell (13); the power panel (9), the resolving board (8) and the MEMS inertial instrument assembly (6) are sequentially arranged in the shell (13) from top to bottom; the large capacitor (4) and the MEMS inertia instrument assembly (6) are arranged in parallel; the cover plate (11) is arranged at the upper part of the power panel (9) and is connected with the shell (13); the MEMS inertial instrument assembly (6) is connected with the shell (13) through an assembly mounting reference piece; the resolving plate (8) and the MEMS inertia instrument assembly (6) are installed in a staggered mode; the power panel (9) and the resolving board (8) are arranged back to back.

2. The miniaturized MEMS attitude and heading reference system according to claim 1, wherein: the assembly mounting reference piece comprises three bosses (14) arranged at the inner bottom of the shell (13), wherein the three bosses (14) are arranged in a delta shape, and the flatness error of the plane where the upper surfaces of the three bosses (14) are positioned is not more than 0.02; the MEMS inertial meter assembly (6) produces a mounting error angle of no more than 0.026 on three bosses (14).

3. The miniaturized MEMS attitude and heading reference system according to claim 2, wherein: when the three bosses (14) are arranged in a delta shape, the distance between two adjacent bosses (14) is 44mm.

4. A miniaturized MEMS attitude and heading reference system according to claim 3, wherein: the assembly mounting reference piece further comprises a positioning strip (15) arranged at the inner bottom of the shell (13), and the MEMS inertia instrument assembly (6) is clamped on the positioning strip (15) and is arranged at the bottom of the shell (13) through a boss (14).

5. The miniaturized MEMS attitude and heading reference system according to claim 1 or 2 or 3 or 4, characterized in that: the resolving plate (8) is provided with a micro-rectangular connector, and the micro-rectangular connector faces the MEMS inertia instrument assembly (6).

6. The miniaturized MEMS attitude and heading reference system according to claim 5, wherein: the power panel (9) is provided with a power module, and the power module faces the cover plate (11).

7. The miniaturized MEMS attitude and heading reference system according to claim 6, wherein: the bottom of the shell (13) is provided with a flange connection hole, and the flange connection hole comprises a first flange connection hole (16), a second flange connection hole (17), a third flange connection hole (18) and a fourth flange connection hole (19); the distance between the first flange connecting hole (16) and the center of the bottom of the shell (13) is L1; the distance between the second flange connecting hole (17) and the center of the bottom of the shell (13) is L2; the distance between the third flange connecting hole (18) and the center of the bottom of the shell (13) is L3; the distance between the fourth flange connecting hole (19) and the center of the bottom of the shell (13) is L4; the L4 > l1=l2=l3.

8. The miniaturized MEMS attitude and heading reference system according to claim 7, wherein: the miniature MEMS attitude and heading reference system further comprises a capacitor bracket (3), a support column (5) and a support column (7); the large capacitor (4) is arranged at the inner bottom of the shell (13) through the capacitor bracket (3); the resolving plate (8) is arranged at the inner bottom of the shell (13) through the supporting column (5); the power panel (9) is arranged on the resolving board (8) through the support column (7).

9. The miniaturized MEMS attitude and heading reference system according to claim 8, wherein: the miniaturized MEMS attitude and heading reference system further comprises a socket gasket (2) and a cover plate gasket (10); the cover plate gasket (10) is arranged between the cover plate (11) and the shell (13); the marine connector (1) penetrates through the side wall of the shell (13) through the socket liner (2).

10. The miniaturized MEMS attitude and heading reference system according to claim 9, wherein: the outer surface of the shell (13) and the outer surface of the cover plate (11) are provided with corrosion-resistant layers.