Flexible labyrinth sealing device of photoelectric rotary table

Abstract

The utility model provides a flexible labyrinth sealing device of a photoelectric rotary table, and belongs to the field of photoelectric rotary table sealing. The problem that the sealing performance of the photoelectric turntable cannot meet requirements is solved. The two ends of a load cabin of the photoelectric rotary table are connected with a main frame through a rotating shaft, the sealing device is arranged on the outer side of the rotating shaft, the sealing device comprises mounting flanges and a flexible cavity, the mounting flanges are arranged on the two sides of the flexible cavity, and the two mounting flanges are connected to the load cabin and the main frame respectively. The flexible cavity is of an annular structure with a cavity inside, flexible walls are arranged on the periphery of the annular structure, a labyrinth flexible structure is formed at the middle connecting position of the flexible walls through multiple times of bending, a first cavity and a second cavity are formed in the two sides of the labyrinth flexible structure respectively, and the flexible cavity is filled with sealing media. The sealing device is mainly used for sealing and limiting the photoelectric turntable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photoelectric turntable sealing field, especially relate to a kind of photoelectric turntable flexible labyrinth seal device. BACKGROUND

[0002] Photoelectric turntable is a kind of high-precision precision reconnaissance equipment, and is applied more and more widely on reconnaissance aircraft, reconnaissance vehicles and ships. Precise optical instruments and bearings are carried in the interior of photoelectric turntable, which are extremely sensitive to humid, sandy dust and other environments. Once damaged, the economic loss and time cost are great, so it is necessary to maintain a relatively isolated environment for optical instruments and bearings from the outside, and this depends on the sealing of photoelectric turntable. With the increase of application scenarios of photoelectric turntable, the environmental adaptability requirement of photoelectric turntable by users also becomes higher, which puts forward higher requirements for sealing.

[0003] The common sealing form of photoelectric turntable is divided into static sealing and dynamic sealing. Static sealing usually needs to be used in cooperation with sealing ring, and the sealing performance is better than dynamic sealing. When dynamic sealing is adopted, spring energy storage ring or magnetic fluid is generally used. When spring energy storage ring is used, wear needs to be considered, and spring energy storage ring needs to be compressed, which introduces large friction. When magnetic fluid is used, the sealing performance is good, but the price is relatively high, and special installation requirements are put forward for turntable structure, which increases design and processing cost.

[0004] The pitch movement of general photoelectric turntable has a specified angle range, and some also limit the azimuth movement. It will not rotate unlimitedly. When designing equipment with high sealing requirement, magnetic fluid is generally used at this time. At this time, not only the cost is increased, but also the performance of magnetic fluid is wasted. At this time, magnetic fluid does not provide limiting function, and needs to be designed additionally. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing a kind of photoelectric turntable flexible labyrinth seal device to solve the problem that the sealing performance of photoelectric turntable cannot meet the demand.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a kind of photoelectric turntable flexible labyrinth seal device, the load cabin both ends of photoelectric turntable are connected with main frame through rotating shaft, sealing device is set at the outside of rotating shaft, the sealing device includes installation flange and flexible cavity, the both sides of the flexible cavity are provided with installation flange, two installation flanges are connected on load cabin and main frame respectively, the flexible cavity is annular structure with internal cavity, and the periphery of annular structure is flexible wall, the middle connecting place of flexible wall is formed into labyrinth flexible structure by multiple bending, the both sides of the labyrinth flexible structure are first cavity and second cavity respectively, and the flexible cavity is filled with sealing medium.

[0007] Further, the labyrinth flexible structure is in communication with the first cavity and the second cavity.

[0008] Further, the flexible cavity is filled with sealing medium through the valve.

[0009] Further, the valve is arranged at the labyrinth flexible structure.

[0010] Further, the valve is arranged at the labyrinth flexible structure.

[0011] Further, the sealing medium is nitrogen or hydraulic oil.

[0012] Further, the outer side of the mounting flange is provided with a sealing strip.

[0013] Further, the outer connecting surface of the mounting flange is provided with a sealing groove, and the sealing strip is arranged in the sealing groove.

[0014] Further, the sealing device is arranged concentrically with the rotating shaft.

[0015] Further, the mounting flange is connected with the load cabin and the main frame through bolts.

[0016] Compared with the prior art, the photoelectric rotary table flexible labyrinth sealing device has the advantages that: compared with the existing magnetic fluid, spring energy storage ring and felt ring sealing forms, the photoelectric rotary table flexible labyrinth sealing device is combined with the flexible cavity and the sealing medium, the labyrinth flexible structure is stretched during the rotation of the load cabin, the volume and pressure change of the flexible cavity are compensated through the stretching deformation process, the dynamic sealing is converted into static sealing, and the sealing performance of the photoelectric rotary table is improved.

[0017] The photoelectric rotary table limiting position is achieved through the design of the labyrinth flexible structure, the elongation of the labyrinth flexible structure reaches the maximum limit when the bent labyrinth flexible structure is completely unfolded, the photoelectric rotary table cannot continue to rotate at this time, and therefore the photoelectric rotary table works within the set angle range, the sealing performance of the device is not wasted, and no additional friction is introduced. Compared with the existing photoelectric rotary table dynamic sealing form and limiting mode, the photoelectric rotary table flexible labyrinth sealing device combines sealing and limiting through the reasonable design of the flexible cavity and the sealing medium, the structure of the photoelectric rotary table is simplified, and the reliability of the device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0019] Fig. 1 A flexible labyrinth sealing device connection structure schematic view of an optoelectronic turntable according to the utility model;

[0020] Fig. 2 A flexible labyrinth sealing device cross section structure schematic view of an optoelectronic turntable according to the utility model;

[0021] Fig. 3 A flexible cavity cross section structure schematic view according to the utility model.

[0022] In the drawings:

[0023] 1 - load cabin, 2 - main frame, 3 - mounting flange, 4 - flexible cavity, 5 - valve, 6 - rotating shaft, 7 - sealing strip, 8 - first cavity, 9 - second cavity, 10 - flexible wall, 11 - labyrinth flexible structure. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the utility model, not all the embodiments.

[0025] Referring to Figs. 1-3 In the embodiment, a flexible labyrinth sealing device of an optoelectronic turntable is described, the load cabin 1 of the optoelectronic turntable is connected between the two ends of the main frame 2 through the rotating shaft 6, the sealing device is arranged on the outside of the rotating shaft 6, the sealing device comprises a mounting flange 3 and a flexible cavity 4, the two sides of the flexible cavity 4 are provided with the mounting flange 3, the two mounting flanges 3 are connected on the load cabin 1 and the main frame 2 respectively, the flexible cavity 4 is a ring structure with an internal cavity, the periphery of the ring structure is a flexible wall 10, the middle connecting part of the flexible wall 10 is formed into a labyrinth flexible structure 11 through multiple bending, the two sides of the labyrinth flexible structure 11 are a first cavity 8 and a second cavity 9 respectively, and the flexible cavity 4 is filled with sealing medium.

[0026] In the embodiment, the labyrinth flexible structure 11 is in communication with the interiors of the first cavity 8 and the second cavity 9, so that the flowability of the sealing medium in the first cavity 8 and the second cavity 9 is ensured.

[0027] In the embodiment, the flexible cavity 4 is provided with a valve 5, and the flexible cavity 4 is filled with sealing medium through the valve 5.

[0028] In the embodiment, the valve 5 is arranged at the labyrinth flexible structure 11, and the number of the valve 5 is two, and the two valves 5 are symmetrically arranged on the labyrinth flexible structure 11.

[0029] In the embodiment, the sealing medium is nitrogen or hydraulic oil, which ensures the proper internal cavity pressure of the flexible cavity 4.

[0030] In the embodiment, the outer side of the mounting flange 3 is provided with a sealing strip 7. The outer connecting surface of the mounting flange 3 is provided with a sealing groove, and the sealing strip 7 is installed in the sealing groove.

[0031] In the embodiment, the sealing device is concentrically arranged with the rotating shaft 6. The mounting flange 3 is connected with the load cabin 1 and the main frame 2 through bolts.

[0032] In the embodiment, the flexible cavity 4 is made of flexible material, such as corrosion-resistant film. The flexible cavity 4 can be deformed, and the labyrinth flexible structure 11 formed by multiple bending can be stretched and deformed under external force.

[0033] The working process of the embodiment is as follows:

[0034] During assembly, the sealing medium is filled into the cavity of the flexible cavity 4 through the valve 5 to maintain proper pressure, and the installation is performed at a proper angle.

[0035] During operation, the load cabin 1 is driven to rotate by the rotating shaft 6, and the flexible cavity 4 is simultaneously twisted when the load cabin 1 rotates. At this time, the flexible cavity 4 is twisted and deformed,

[0036] The internal cavity volume of the flexible cavity 4 changes, causing a change in pressure. The labyrinth flexible structure 11 is gradually stretched during the twisting of the cavity, and the bent labyrinth flexible structure 11 gradually unfolds. The unfolding of the labyrinth flexible structure 11 compensates for the volume and pressure changes of the flexible cavity 4.

[0037] During rotation, the mounting flange 3 and the load cabin 1, and the mounting flange 3 and the main frame 2 are always statically sealed by the sealing strip 7 without dynamic sealing and introduction of additional friction, which improves the sealing performance.

[0038] When the load cabin 1 is rotated to a certain angle, the deformation of the labyrinth flexible structure 11 reaches a limit, and the compensation for the volume and pressure changes of the flexible cavity 4 reaches a limit. The load cabin 1 cannot continue to rotate, thereby limiting the load cabin 1. The rotation limiting angle range can be changed by changing the structure of the flexible cavity 4, the installation angle, the sealing medium material, or the pressure.

[0039] The photoelectric turntable is widely applied in the field of military reconnaissance, and the load cabin 1 and the main frame 2 are connected by the rotating shaft 6, and the sealing device is arranged outside the rotating shaft 6 and concentric with the rotating shaft 6. The mounting flange 3 is fastened and connected with the load cabin 1 and the main frame 2 by bolts, and the outer connecting surface of the mounting flange 3 is processed with a sealing groove, and the sealing strip 7 is embedded in the sealing groove, so as to ensure the sealing performance of the connecting part of the mounting flange 3, the load cabin 1 and the main frame 2. The flexible cavity 4 adopts a ring structure, and the flexible wall 10 is arranged around the flexible cavity 4. The middle connecting part of the flexible wall 10 is bent for many times to form a labyrinth flexible structure 11, and the two sides of the labyrinth flexible structure 11 are respectively a first cavity 8 and a second cavity 9, and the labyrinth flexible structure 11 is in communication with the interiors of the first cavity 8 and the second cavity 9, so as to ensure the smooth flow of the sealing medium in the cavities. The flexible cavity 4 is made of flexible materials such as anti-corrosion film, and has good deformation capacity. Under the action of external force, the labyrinth flexible structure 11 can be stretched and deformed. Two valves 5 are arranged on the flexible cavity 4 and symmetrically distributed at the labyrinth flexible structure 11, and are used for filling the sealing medium into the flexible cavity 4. The sealing medium can be nitrogen or hydraulic oil, so as to maintain the appropriate pressure in the interior cavity of the flexible cavity 4.

[0040] During assembly, first, all components are strictly checked to ensure that the load cabin 1, the main frame 2, the mounting flange 3, the flexible cavity 4, the valve 5, the rotating shaft 6 and the sealing strip 7 have no quality problems, no damage, no deformation and the like. The sealing strip 7 is accurately installed in the sealing groove of the mounting flange 3, so as to ensure firm installation and tight sealing. Then, the flexible cavity 4 is connected with the load cabin 1 and the main frame 2 through the mounting flange 3, and is fastened by bolts, so as to ensure close connection. Then, the sealing medium is filled into the flexible cavity 4 through the valve 5. During the filling process, the pressure is monitored in real time by using a pressure monitoring instrument, so that the pressure reaches a predetermined appropriate value, and at the same time, the whole sealing device is carefully checked for leakage. If there is leakage, it is processed in time.

[0041] In work, when the photoelectric turntable starts to work, the load cabin 1 is driven to rotate by the rotating shaft 6, the flexible cavity 4 is synchronously twisted by the load cabin 1, the flexible cavity 4 is twisted to deform, the internal cavity volume of the flexible cavity 4 is changed, and then the pressure change is caused. At this time, the labyrinth flexible structure 11 is gradually stretched in the cavity twisting process, the originally bent labyrinth flexible structure 11 is slowly unfolded, and the volume and pressure change of the flexible cavity 4 is compensated through the unfolding process. For example, when the internal pressure of the flexible cavity 4 is increased due to the volume change, the unfolding of the labyrinth flexible structure 11 can accommodate the part of the volume change, so that the pressure is stable. In the whole rotating process, the mounting flange 3, the load cabin 1 and the main frame 2 always maintain a static sealing state by the sealing strip 7, there is no dynamic sealing, and additional friction force cannot be generated, so that the sealing performance is effectively improved. When the load cabin 1 is rotated to a specific angle, the deformation of the labyrinth flexible structure 11 reaches the limit, and the volume and pressure change of the flexible cavity 4 cannot be compensated any more, so that the load cabin 1 cannot continue to rotate, and the limiting function of the load cabin 1 is realized. In actual application, according to the specific work requirements of the photoelectric turntable, the structure parameters (such as the bending times, the bending angle of the labyrinth flexible structure 11, the thickness of the flexible wall 10, etc.) of the flexible cavity 4, the installation angle, the material characteristics or pressure of the sealing medium and other factors can be adjusted to accurately change the angle range of the rotation limiting, so as to adapt to different task scenes and work requirements.

[0042] The above disclosed embodiments of the utility model are only used for helping to explain the utility model. The embodiments do not describe all the details, and the utility model is not limited to the specific implementation mode. According to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments, in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model.

Claims

1. An electro-optical rotary joint flexible labyrinth seal apparatus, characterized by: The load cabin (1) of the photoelectric turntable is connected with the main frame (2) through the rotating shaft (6) at both ends, and the sealing device is arranged outside the rotating shaft (6), the sealing device comprises a mounting flange (3) and a flexible cavity (4), the flexible cavity (4) is provided with the mounting flange (3) on both sides, the two mounting flanges (3) are connected with the load cabin (1) and the main frame (2) respectively, the flexible cavity (4) is a ring structure with an internal cavity, the periphery of the ring structure is a flexible wall (10), the middle connecting part of the flexible wall (10) is formed into a labyrinth flexible structure (11) through multiple bending, the two sides of the labyrinth flexible structure (11) are a first cavity (8) and a second cavity (9) respectively, and the flexible cavity (4) is filled with sealing medium.

2. A flexible labyrinth seal for an optical-electrical rotary joint as claimed in claim 1, wherein: The labyrinth flexible structure (11) is in communication with the first cavity (8) and the second cavity (9) inside.

3. A flexible labyrinth seal for an optical-electrical rotary joint as claimed in claim 1, wherein: The flexible cavity (4) is provided with a valve (5), and the flexible cavity (4) is filled with the sealing medium through the valve (5).

4. A flexible labyrinth seal for an optical-electrical rotary joint as claimed in claim 3, wherein: The valve (5) is arranged at the labyrinth flexible structure (11).

5. A flexible labyrinth seal for an optical-electrical rotary joint as claimed in claim 4, wherein: The number of the valve (5) is two, and the two valves (5) are symmetrically arranged on the labyrinth flexible structure (11).

6. A flexible labyrinth seal for an optical-electrical rotary joint as claimed in claim 1, wherein: The sealing medium is nitrogen or hydraulic oil.

7. A flexible labyrinth seal for an optical-electrical rotary joint as claimed in claim 1, wherein: The outer side of the mounting flange (3) is provided with a sealing strip (7).

8. A flexible labyrinth seal for an optical-electrical rotary joint according to claim 7, wherein: The outer connecting surface of the mounting flange (3) is provided with a sealing groove, and the sealing strip (7) is mounted in the sealing groove.

9. A flexible labyrinth seal for an optical-electrical rotary joint as claimed in claim 1, wherein: The sealing device is arranged concentrically with the rotating shaft (6).

10. A flexible labyrinth seal for an optical-electrical rotary joint as claimed in claim 1, wherein: The mounting flange (3) is connected with the load cabin (1) and the main frame (2) through bolts.

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