High-precision miniature optical fiber inertial measurement unit
By employing a hexahedral structure and thermal conductivity and vibration damping design, the problems of large size and poor anti-interference capability of miniature fiber optic inertial measurement units have been solved, resulting in a high-precision fiber optic inertial measurement unit with strong shock resistance.
Patent Information
- Application Number
- CN202422904616.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing miniature fiber optic inertial measurement units are large in size, have poor anti-interference ability, low measurement accuracy, poor shock resistance, and poor heat dissipation performance.
The housing features a hexahedral structure with internal heat-conducting structures and shock absorbers. A thermally conductive silicone pad is placed between the main circuit board and the cover plate. The platform is mounted in the housing via shock absorbers. Sensitive components are installed in compartments, and a soft magnetic alloy shielding plate is used to reduce signal interference.
It improves shock and vibration resistance, enhances heat dissipation performance, reduces signal interference between sensitive components, improves measurement accuracy and anti-interference ability, and reduces equipment size.
Smart Images
Figure CN223525803U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of optical fiber inertial measurement, especially to a high-precision miniature optical fiber inertial measurement unit. BACKGROUND
[0002] The existing miniature optical fiber inertial measurement unit is generally installed in layers, and various sensitive components are arranged in sequence, which occupies a large space, resulting in a large volume of the optical fiber inertial measurement unit, and the internal inertial devices are easily disturbed by internal circuit signals, the temperature of the sensitive devices rises unevenly, resulting in unstable output data, low reliability and low measurement accuracy. At the same time, the gap between each sensitive component is small, resulting in poor anti-vibration impact capability of the miniature inertial navigation equipment. SUMMARY
[0003] In view of the above problems in the prior art, the utility model aims to provide a high-precision miniature optical fiber inertial measurement unit to solve the problems of large volume, poor anti-interference capability, poor measurement accuracy, poor impact resistance and poor heat dissipation performance.
[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme: a high-precision miniature optical fiber inertial measurement unit, characterized by: a shell, a table body and a main circuit board installed in the shell, the shell is a hexahedral structure, has a cavity inside and is open on one side, and a cover plate is covered on the open side, the main circuit board is fixedly connected with the shell and is parallel to the cover plate, a heat conduction structure is arranged between the main circuit board and the cover plate, so that the heat of the main circuit board can be transferred to the shell; a plurality of shock absorbers are arranged on the inner wall of the shell, the table body is connected with the shell through the shock absorbers, and there is a gap between the table body, the inner wall of the shell and the main circuit board; the table body has a plurality of mounting surfaces, recesses and / or through holes are formed on each mounting surface to form a plurality of mounting sub-warehouses, and each mounting sub-warehouse is installed with a sensitive component, and each sensitive component is connected with the main circuit board through a flexible wire plate.
[0005] As an optimization, the main circuit board is fixedly connected with the open side of the shell, and there is a gap between the main circuit board and the cover plate after the cover plate is covered on the shell, and the heat conduction structure is arranged in the gap.
[0006] As an optimization, the heat conduction structure is a heat-conducting silica gel pad, and the two sides of the heat-conducting silica gel pad are in contact with the main circuit board and the cover plate respectively after the cover plate is covered on the shell.
[0007] As an optimization, the sensitive component includes one or more of an optical fiber gyroscope, a MEMS accelerometer, a velocity sensitive component, a detector, a coupler, an optical component and a circuit board.
[0008] As optimization, the open side of the installation sub-compartment is also provided with a shielding plate to close the installation sub-compartment.
[0009] As optimization, the shielding plate is a magnetic shielding plate made of soft magnetic alloy.
[0010] As optimization, a plurality of shock-absorbing seats are provided on the inner wall of the shell, the shock-absorbing seats have positioning shafts perpendicular to the cover plate, connecting ears are provided on the platform body corresponding to the positions of the positioning shafts, and the connecting ears of the platform body are fixedly connected with the positioning shafts through shock absorbers, so that the platform body can freely vibrate along the axial direction of the positioning shafts.
[0011] As optimization, the shock-absorbing seats are four and are distributed at the connecting portions of the adjacent two side walls of the shell.
[0012] As optimization, the shock-absorbing seats are located in different planes.
[0013] As optimization, the platform body includes four side plates which are sequentially connected and form a rectangular frame structure, a partition plate is provided at the middle of the inner side of the rectangular frame, the partition plate is parallel to the cover plate and is fixedly connected with at least one of the side plates, and the recesses and / or through holes are provided on the outer side of the four side plates, so that the two sides of the partition plate and the recesses and / or through holes form the installation sub-compartment.
[0014] Compared with the prior art, the utility model has the advantages that: the platform body is installed in the shell through the shock absorbers, so that it can freely vibrate, thereby improving the impact resistance and shock resistance, meanwhile, the main circuit board as the main heat generating component is connected with the side wall of the shell through the heat conduction structure, and there is a gap between the main circuit board and the platform body, thereby improving the heat dissipation performance. Different sensitive components are installed in different installation sub-compartment through the sub-compartment of the platform body, thereby reducing the signal interference between the sensitive components, improving the anti-interference ability, and reducing the volume, and the utility model has good application prospect. BRIEF DESCRIPTION OF DRAWINGS
[0015] Fig. 1 It is a structural schematic view of the utility model;
[0016] Fig. 2 It is a structural schematic view of the shell of the utility model;
[0017] Fig. 3 It is an assembly schematic view of the platform body of the utility model;
[0018] 1 shell, 2 cover plate, 3 main circuit board, 4 shielding plate, 5 soft wire plate, 6 gasket, 7 compression nut, 8 positioning shaft, 9 platform body, 10 sensitive component, 11 connecting ear. DETAILED DESCRIPTION
[0019] The utility model will be further described in connection with the drawings and embodiments.
[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.
[0021] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "linked" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0022] Embodiment: see Figs. 1-3The utility model provides a high-precision miniature optical fiber inertial measurement unit, including shell 1, and the platform 9 and main circuit board 3 installed in the inside of shell 1, wherein, main circuit board 3 is fixedly connected with shell 1, and is equipped with heat conduction structure between the inner wall of shell 1, can make the heat of main circuit board 3 transfer to shell 1, makes the heat generated rapidly disperses to whole shell 1, improves the heat dissipation performance, the shell 1 is hexahedral structure, has the cavity in the inside and has the opening on one side, and the cover plate 2 is covered on the opening, the main circuit board 3 is fixedly installed at the opening, and after the cover plate 2 is covered with shell 1, the clearance is formed between the main circuit board 3 and the cover plate 2, and the heat conduction structure is arranged in the clearance, the heat conduction structure is heat-conducting silica gel pad, and the two sides of heat-conducting silica gel pad are in contact with the main circuit board 3 and the cover plate 2 respectively after the cover plate 2 is covered with shell 1.
[0023] A plurality of shock absorbers are arranged on the inner wall of the shell 1, the platform 9 is connected with the shell 1 through the shock absorbers, and the platform 9 has a gap between the inner wall of the shell 1 and the main circuit board 3, so that the platform 9 can freely vibrate in the shell 1. Specifically, one shock absorber is arranged at the connection of each adjacent side wall of the shell 1, a total of four shock absorbers are arranged, a positioning shaft 8 perpendicular to the cover plate 2 is arranged on each shock absorber, and a corresponding connecting lug 11 is arranged on the platform 9. The connecting lug 11 is connected with the positioning shaft 8 through an equal-stiffness shock absorber, so that the platform 9 can freely vibrate along the axis direction of the positioning shaft 8. Each shock absorber is located in a different plane, and each connecting lug 11 is located in a different plane. The structure of the equal-stiffness shock absorber mainly includes elastic washers 6 located on both sides of the connecting lug 11. The positioning shaft 8 passes through the washers 6 and the connecting lug 11 and is fixed by a compression nut 7, so that the platform 9 can freely vibrate under the action of the washers 6 and the positioning shaft 8. The structure of the shock absorber is prior art and is not described in detail.
[0024] The platform 9 has a plurality of mounting surfaces, and recesses or through holes are formed on each mounting surface to form a plurality of mounting sub-warehouses. Specifically, the platform includes four side plates that are sequentially connected to form a rectangular frame structure. A partition plate is arranged in the middle of the inner side of the rectangular frame. The partition plate is parallel to the cover plate and is fixedly connected to at least one of the side plates. The recesses and / or through holes are arranged on the outer sides of the four side plates, so that the mounting sub-warehouses are formed on both sides of the partition plate and the recesses and / or through holes. Each sensitive component 10 is arranged in each mounting sub-warehouse. Each sensitive component 10 is connected to the main circuit board 3 through a flexible wire plate 5. The flexible wire plate 5 connects the sensitive component 10 and the main circuit board 3 together, transmits signals, and ensures that the sensitive component 10 can displace relative to the shell 1 under vibration, impact, and other conditions without affecting the output signal.
[0025] The sensitive component 10 comprises one or more of an optical fiber gyroscope, a MEMS accelerometer, a velocity sensitive component, a detector, a coupler, an optical component, a circuit board. The mounting compartment is closed by a shielding plate 4. The shielding plate 4 is a magnetic shielding plate 4 made of soft magnetic alloy. The circuit signal interference on the sensitive component 10 such as the optical fiber gyroscope is reduced by the compartment, so that the gyroscope output signal is stable and less affected by temperature.
[0026] The sensitive components are individually arranged in the compartments, and the compartments are sealed to avoid external electromagnetic field interference. The main heat generating components of the inertial measurement unit are mainly distributed on the main circuit board, and the main circuit board heat generating components are in contact with the cover plate, and the product heat is quickly dissipated through the shell.
[0027] In summary, the utility model discloses a table body is installed in the shell through the shock absorber, can freely vibrate, thereby improve the anti -impact shock resistance, simultaneously, main circuit board as the main heat generating component, and the side wall of shell is connected through the heat conduction structure, and main circuit board and table body have the gap between, thereby improve the heat dissipation performance. The different sensitive components are arranged in different mounting compartments, so that the signal interference between the sensitive components is reduced, the anti-interference ability is improved, the volume is reduced, and the utility model has good application prospect.
[0028] Finally, it should be noted that the above examples are used to illustrate the technical solutions of the utility model, but not to limit the technical solutions, and those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced, without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the utility model.
Claims
1. A high-precision miniature fiber-optic inertial measurement unit, characterized by: The application relates to a sensitive assembly installation device, which comprises a shell, a table body and a main circuit board, wherein the shell is a hexahedron structure with a cavity inside and an open side, a cover plate is arranged on the open side, the main circuit board is fixedly connected with the shell and parallel to the cover plate, a heat conduction structure is arranged between the main circuit board and the cover plate, so that the heat of the main circuit board can be transferred to the shell, a plurality of shock absorbers are arranged on the inner wall of the shell, the table body is connected with the shell through the shock absorbers, and gaps are formed between the table body, the inner wall of the shell and the main circuit board; the table body has a plurality of installation surfaces, recesses and / or through holes are arranged on the installation surfaces to form a plurality of installation sub-rooms, and sensitive components are respectively arranged in the installation sub-rooms; and the sensitive components are connected with the main circuit board through a flexible wire plate.
2. The high-precision micro fiber-optic inertial measurement unit according to claim 1, characterized in that: The main circuit board is fixedly connected with the open side of the shell, and gaps are formed between the main circuit board and the cover plate after the cover plate is connected with the shell, and the heat conduction structure is arranged in the gaps.
3. The high-precision micro fiber-optic inertial measurement unit according to claim 2, characterized in that: The heat conduction structure is a heat conduction silica gel pad, and the two sides of the heat conduction silica gel pad are respectively in contact with the main circuit board and the cover plate after the cover plate is connected with the shell.
4. The high-precision micro fiber-optic inertial measurement unit according to claim 1, wherein, The sensitive components include one or more of an optical fiber gyroscope, a MEMS accelerometer, a speed sensitive component, a detector, a coupler, an optical component and a circuit board.
5. The high-precision miniature fiber-optic inertial measurement unit according to claim 1, characterized in that: The open side of the installation sub-room is further provided with a shielding plate to seal the installation sub-room.
6. The high-precision micro-fiber-optic inertial measurement unit according to claim 5, characterized in that: The shielding plate is a magnetic shielding plate made of soft magnetic alloy.
7. The high-precision miniature fiber-optic inertial measurement unit according to claim 1, characterized in that: A plurality of shock absorbing seats are arranged on the inner wall of the shell, the shock absorbing seats have positioning shafts perpendicular to the cover plate, connecting ears are arranged on the table body and correspond to the positions of the positioning shafts, the connecting ears of the table body are fixedly connected with the positioning shafts through shock absorbers, so that the table body can freely vibrate along the axial direction of the positioning shafts.
8. The high-precision micro-fiber-optic inertial measurement unit according to claim 7, characterized in that: The shock absorbing seats are four and are distributed at the connecting positions of the adjacent two side walls of the shell.
9. The high-precision micro-fiber-optic inertial measurement unit according to claim 7, characterized in that: The shock absorbing seats are located in different planes.
10. The high-precision miniature fiber-optic inertial measurement unit of claim 1, wherein: The table body comprises four side plates which are sequentially connected and form a rectangular frame structure, a partition plate is arranged in the middle of the inner side of the rectangular frame structure, the partition plate is parallel to the cover plate and is fixedly connected with at least one of the side plates, and the recesses and / or through holes are arranged on the outer sides of the four side plates, so that the installation sub-rooms are formed on the two sides of the partition plate and the recesses and / or through holes.