A structure for electromagnetic sealing of the rotating shaft system of an optoelectronic pod

Abstract

A structure for electromagnetic sealing of the rotating shaft system of an optoelectronic pod, belonging to the field of airborne optoelectronic technology; it includes a fixed conductive seat, a conductive brush and an automatic pre-tightening device. The fixed conductive seat is fixed on the fixed housing of the shaft system, and the conductive brush is fixed on the rotating housing of the shaft system; the notch of the conductive brush and the notch of the fixed conductive seat are arranged oppositely, and the conductive brush is coaxially inserted into the U-shaped ring groove of the fixed conductive seat; a plurality of automatic pre-tightening devices are arranged circumferentially between the fixed conductive seat and the conductive brush; the fixed seat of the automatic pre-tightening device is fixed on the inner bottom surface of the U-shaped groove of the fixed conductive seat, and the spherical contact head is always in close contact with the conductive brush through the spring force pre-tightening. In the present invention, the fixed conductive seat and the conductive brush are always in close contact under the action of the automatic pre-tightening device, and also keep contact rotation during the rotation of the shaft system, realizing the all-metal conductive shielding in the moving or stationary state of the rotating part of the optoelectronic pod, and effectively shielding the electromagnetic interference sources of the internal equipment of the optoelectronic pod.

Description

Technical Field

[0001] The present invention belongs to the field of airborne optoelectronic technology, and particularly relates to a structure for electromagnetic sealing of a rotating shaft system of an optoelectronic pod. Background Art

[0002] An airborne optoelectronic pod is an optoelectronic device installed on an unmanned aerial vehicle, a helicopter or a fixed-wing aircraft for observation, search and mapping. The rotating shaft system is an essential component for the movement of the optoelectronic pod. When designing the rotating shaft system, it is necessary to select bearings and non-metallic sealing rings. The gaps between the inner ring, outer ring and rolling elements of the bearing, as well as the non-metallic sealing ring part, are all spaces that cause electromagnetic radiation leakage of the optoelectronic pod. In the electromagnetic compatibility test of the optoelectronic pod, the treatment of the rotating shaft system has always been a troublesome part.

[0003] The currently commonly used design method is to treat the internal equipment of the optoelectronic pod, add shielding protection to equipment or components with electromagnetic radiation, especially to completely wrap and shield equipment and cables with large electromagnetic radiation, reduce the electromagnetic radiation of individual equipment, and thus reduce the overall leakage. This method requires repeated wrapping and shielding of the equipment and then conducting tests. At the same time, due to the irregular shape of the equipment, the shielding wrapping treatment method is complex, and the radiation of the internal equipment cannot be quickly and effectively solved. It is necessary to conduct shielding treatment tests repeatedly, resulting in low efficiency. Summary of the Invention

[0004] Technical Problems to be Solved

[0005] In order to avoid the deficiencies of the prior art, the present invention provides a structure for electromagnetic sealing of a rotating shaft system of an optoelectronic pod, and designs an electromagnetic sealing structure on the rotating shaft system to seal the shaft system gap, thereby effectively reducing the electromagnetic radiation leakage of the optoelectronic pod, reducing the external electromagnetic radiation of the internal equipment of the optoelectronic pod, improving the electromagnetic sealing performance of the optoelectronic pod, and preventing the electromagnetic radiation leakage of the optoelectronic pod from interfering with other airborne electronic devices; it can optimize the electromagnetic compatibility parameters and treatment methods of the optoelectronic pod.

[0006] The technical solution of the present invention is: a structure for electromagnetic sealing of a rotating shaft system of an optoelectronic pod, characterized in that: it includes a fixed conductive seat, a conductive brush and an automatic pre-tightening device. The fixed conductive seat is fixed on the shaft system fixed housing, and the conductive brush is fixed on the shaft system rotating housing;

[0007] The fixed conductive seat is a circular ring with a U-shaped structure in the radial cross-section, and the opening of the U-shaped ring groove is located on one end face of the circular ring; the material of the fixed conductive seat is conductive metal copper or steel;

[0008] The conductive brush is circular, and its radial cross-section is a U-shaped structure with a converging bottom. The opening of the U-shaped ring groove is located on one end face of the circular ring; the material of the conductive brush is spring steel;

[0009] The notch of the conductive brush and the notch of the fixed conductive seat are arranged oppositely, and the conductive brush is coaxially inserted into the U-shaped ring groove of the fixed conductive seat; a plurality of the automatic pre-tightening devices are arranged circumferentially between the fixed conductive seat and the conductive brush;

[0010] The automatic pre-tightening device includes a spherical contact head, a spring and a fixed seat. The spherical contact head is fixed on the fixed seat through the spring; the fixed seat is fixed on the inner bottom surface of the U-shaped groove of the fixed conductive seat, and the spherical contact head is always in close contact with the conductive brush through the pre-tightening force of the spring.

[0011] A further technical solution of the present invention is that an annular carbon lubricating layer is fixed on the end surface of the conductive brush in contact with the fixed conductive seat, which can conduct electricity and lubricate during contact friction, ensure close contact with the fixed conductive seat and reduce the frictional torque at the same time.

[0012] A further technical solution of the present invention is that the material of the spherical contact head is copper or steel.

[0013] A further technical solution of the present invention is that the material of the fixed seat is steel or copper.

[0014] A further technical solution of the present invention is that both ends of the spring are fixed to the spherical contact head and the fixed seat respectively by welding or riveting.

[0015] A further technical solution of the present invention is that the automatic pre-tightening device is evenly distributed circumferentially in the U-shaped ring groove of the fixed conductive seat.

[0016] A further technical solution of the present invention is that a plurality of threaded holes are opened in the groove bottom surface of the fixed conductive seat along the circumferential direction, and it is fixed to the shafting fixed housing by screws.

[0017] A further technical solution of the present invention is that a plurality of threaded holes are opened in the groove bottom surface of the conductive brush along the circumferential direction, and it is fixed to the shafting rotating housing by screws.

[0018] Beneficial effects

[0019] The beneficial effect of the present invention is that the present invention is used for electromagnetic sealing of the rotating shafting of an optoelectronic pod. The optoelectronic pod is a mission execution device, and the rotating shafting is its necessary moving part. The application of bearings and non-metallic sealing rings brings movement gaps, causing electromagnetic radiation leakage. The shafting electromagnetic sealing device seals all the movement gaps with a conductive housing, eliminates the movement gaps of electromagnetic radiation leakage, can effectively reduce the external electromagnetic radiation of the internal equipment of the optoelectronic pod. This invention can effectively reduce the electromagnetic radiation leakage of the optoelectronic pod, can adapt to rotating shaftings of different size ranges, and is widely used in various types of optoelectronic pods.

[0020] In the present invention, the fixed conductive seat and the conductive brush are always in close contact under the action of the automatic pre-tightening device, and also maintain contact rotation during the rotational movement of the shafting, realizing the all-metal conductive shielding in the moving or stationary state of the rotating part of the optoelectronic pod, effectively shielding the electromagnetic interference sources of the internal equipment of the optoelectronic pod. During the electromagnetic compatibility design process of the pod, there is no need to perform electromagnetic shielding on individual interfering source devices, reducing the difficulty and complexity of the electromagnetic compatibility design experiment of the internal equipment of the pod, and solving the electromagnetic leakage problem caused by the movement gap of the rotating shafting of the optoelectronic pod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the rotating shafting of the optoelectronic pod of the present invention;

[0022] Figure 2 is a schematic diagram of the electromagnetic sealing device of the rotating shafting of the optoelectronic pod of the present invention;

[0023] Figure 3 is a schematic diagram of the conductive brush of the electromagnetic sealing device of the present invention;

[0024] Figure 4 is a schematic diagram of the automatic pre-tightening device of the electromagnetic sealing device of the present invention;

[0025] Figure 5 is a schematic diagram of the fixed conductive seat of the electromagnetic sealing device of the present invention;

[0026] Figure 6 is a schematic diagram of the installation of the electromagnetic sealing device in the optoelectronic pod of the present invention;

[0027] DESCRIPTION OF THE REFERENCE NUMERALS: 1 - fixed seat of the rotating shafting, 2 - bearing, 3 - rotating shaft of the rotating shafting, 4 - non-metallic sealing strip, 5 - rotating housing of the optoelectronic pod shafting, 6 - fixed housing of the optoelectronic pod shafting, 7 - electromagnetic sealing device, 8 - conductive brush of the electromagnetic sealing device, 9 - automatic pre-tightening device, 10 - fixed conductive seat, 11 - annular carbon lubricating layer at the end of the conductive brush. DETAILED DESCRIPTION OF THE INVENTION

[0028] The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation on the present invention.

[0030] A structure for electromagnetic sealing of a rotating shaft system of an optoelectronic pod according to the present invention is applied to an optoelectronic pod and is used for single or multiple rotating shaft systems, as shown in Figure 1 the figure.

[0031] As shown in Figure 2 the figure, a structure for electromagnetic sealing of a rotating shaft system of an optoelectronic pod according to the present invention includes a fixed conductive seat 10, a conductive brush 8, and an automatic pre-tightening device 9. The fixed conductive seat 10 is fixed on the fixed housing 6 of the optoelectronic pod shaft system, and the conductive brush 8 is fixed on the rotating housing 5 of the optoelectronic pod shaft system;

[0032] The fixed conductive seat 10 is of a circular ring structure, and its radial cross-section is a U-shaped structure. The opening of the U-shaped groove is located on one end face of the circular ring; a plurality of threaded holes are opened along the circumferential direction on the groove bottom surface and are fixed on the shaft system fixed housing by screws. The material of the fixed conductive seat 10 is conductive metal copper or steel;

[0033] The conductive brush 8 is of a circular ring structure, and its radial cross-section is a U-shaped structure with a converging bottom. The opening of the U-shaped groove is located on one end face of the circular ring; a plurality of threaded holes are opened along the circumferential direction on the groove bottom surface and are fixed on the shaft system rotating housing by screws. The material of the conductive brush is spring steel; an annular carbon lubricating layer is fixed on the end face of the conductive brush 8 in contact with the fixed conductive seat 10, which can conduct electricity and lubricate during contact friction, ensuring close contact with the fixed conductive seat while reducing the frictional torque.

[0034] The notch of the conductive brush 8 and the notch of the fixed conductive seat 10 are arranged opposite to each other, and the conductive brush 8 is coaxially inserted into the U-shaped groove of the fixed conductive seat; a plurality of automatic pre-tightening devices 9 are arranged circumferentially between the fixed conductive seat 10 and the conductive brush 8;

[0035] The automatic pre-tightening device 9 includes a spherical contact head, a spring and a fixed seat. The spherical contact head is fixed to the fixed seat through the spring; the fixed seat is fixed to the inner bottom surface of the U-shaped groove of the fixed conductive seat, and the spherical contact head is always in close contact with the conductive brush through the pre-tightening force of the spring. The material of the spherical contact head is copper or steel; the material of the fixed seat is steel or copper; both ends of the spring are fixed to the spherical contact head and the fixed seat respectively by welding or riveting. The automatic pre-tightening device ensures that the conductive brush of the electromagnetic sealing device is always in close frictional contact with the fixed conductive seat, and at the same time maintains a small frictional torque through elastic adjustment.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A structure for electromagnetic sealing of the rotating shaft system of an optoelectronic pod, characterized in that: It includes a fixed conductive seat, a conductive brush and an automatic pre-tightening device. The fixed conductive seat is fixed on the fixed housing of the shafting, and the conductive brush is fixed on the rotating housing of the shafting; The fixed conductive seat is a circular ring with a U-shaped cross-section in the radial direction. The opening of the U-shaped ring groove is located on one end face of the circular ring. The material of the fixed conductive seat is conductive metal copper or steel; The conductive brush is circular, and its radial cross-section is a U-shaped structure with a converging bottom. The opening of the U-shaped ring groove is located on one end face of the circular ring. The material of the conductive brush is spring steel; The notch of the conductive brush and the notch of the fixed conductive seat are arranged opposite to each other. The conductive brush is coaxially inserted into the U-shaped ring groove of the fixed conductive seat. A plurality of the automatic pre-tightening devices are arranged circumferentially between the fixed conductive seat and the conductive brush; The automatic pre-tightening device includes a spherical contact head, a spring and a fixed seat. The spherical contact head is fixed on the fixed seat through the spring. The fixed seat is fixed on the inner bottom surface of the U-shaped groove of the fixed conductive seat. The spherical contact head is always in close contact with the conductive brush under the pre-tightening force of the spring. The fixed conductive seat and the conductive brush are always in close contact under the action of the automatic pre-tightening device, and also maintain contact rotation during the rotation of the shafting, realizing the full-metal conductive shielding in the moving or static state of the rotating part of the optoelectronic pod, effectively shielding the electromagnetic interference sources of the internal equipment of the optoelectronic pod; An annular carbon lubricating layer is fixed on the end face of the conductive brush in contact with the fixed conductive seat, which can conduct electricity and lubricate during contact friction, ensuring close contact with the fixed conductive seat while reducing the friction torque.

2. The structure for electromagnetic sealing of the rotating shaft system of an optoelectronic pod according to claim 1, characterized in that: The material of the spherical contact head is copper or steel.

3. The structure for electromagnetic sealing of the rotating shaft system of the optoelectronic pod according to claim 1, characterized in that: The material of the fixed seat is steel or copper.

4. The structure for electromagnetic sealing of the rotating shaft system of an optoelectronic pod according to claim 1, characterized in that: Both ends of the spring are fixed to the spherical contact head and the fixed seat by welding or riveting respectively.

5. The structure for electromagnetic sealing of the rotating shaft system of an optoelectronic pod according to claim 1, characterized in that: The automatic pre-tightening devices are evenly distributed circumferentially in the U-shaped ring groove of the fixed conductive seat.

6. The structure for electromagnetic sealing of the rotating shaft system of the optoelectronic pod according to claim 1, characterized in that: A plurality of threaded holes are opened in the circumferential direction on the bottom surface of the groove of the fixed conductive seat and are fixed on the fixed housing of the shafting by screws.

7. The structure for electromagnetic sealing of the rotating shaft system of the optoelectronic pod according to claim 1, characterized in that: A plurality of threaded holes are opened in the circumferential direction on the bottom surface of the groove of the conductive brush and are fixed on the rotating housing of the shafting by screws.

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