CN218849794U

CN218849794U - Normal honeycomb sandwich antenna housing

Info

Publication number: CN218849794U
Application number: CN202223279405.2U
Authority: CN
Inventors: 李超; 尹恩怀; 赵云贵; 朱晨辉; 安占军
Original assignee: Xi'an Ruite 3d Technology Co ltd
Current assignee: Xi'an Ruite 3d Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-04-11
Anticipated expiration: 2032-12-07

Abstract

The utility model provides a normal honeycomb sandwich radome, which consists of a radome body and a mounting flange; the antenna housing body sequentially comprises a housing inner shell, a honeycomb inner skin, a normal honeycomb interlayer, a honeycomb outer skin and a housing outer shell from inside to outside; the normal honeycomb interlayer is obtained by molding a PEEK material by adopting a melt extrusion process, and the direction of the opening of the honeycomb structure is consistent with the normal direction of the corresponding position of the curved surface of the antenna housing; the side wall of the single honeycomb structure is provided with air holes; the honeycomb inner skin and the honeycomb outer skin are PEEK solid core layers obtained by a 3D printing process, and the surfaces after printing are polished, so that the surface roughness is lower than Ra3.2; the cover inner shell, the cover outer shell and the mounting flange are all of a fiber cloth covered hot-press molding structure. The utility model discloses utilize melting extrusion technology shaping PEEK material, obtain and correspond the honeycomb that the position normal direction keeps unanimity with the curved surface to cover body coupling through solid skin layer and hot briquetting in the honeycomb inside and outside, satisfy the bonding strength requirement, be suitable for the industrialization and use.

Description

Normal honeycomb sandwich antenna housing

Technical Field

The utility model relates to a belong to antenna technical field, specifically be a normal direction honeycomb intermediate layer antenna house.

Background

An antenna sensor system for communication, navigation and detection purposes is installed on aircrafts, unmanned planes, warheads and the like in the aerospace field, and an antenna cover is an indispensable part of the antenna sensor system.

The antenna housing has the advantages that in the aspect of structural physical performance, the design requirements such as strength, temperature resistance and light weight are required to be met, and in the aspect of electrical performance design, the wave permeability of different wave bands is required to be met. In order to meet the design requirements, the existing antenna housing adopts a sandwich structure design, the sandwich structure comprises PMI foam filling, a glass fiber reinforced plastic honeycomb and a polyimide honeycomb, and the honeycomb structures can reduce weight and also have the effects of heat insulation and wave transmission.

The inner structure of the existing radome body interlayer is formed by bending and filling flat honeycombs, the curved surface radome body interlayer is bent and filled with the flat honeycombs, the honeycomb layer needs to be cut and spliced when the non-unfolding curved surface is spread and filled, the process is complicated, the honeycomb opening orientation and the normal direction of the corresponding position of the curved surface are difficult to be ensured to be consistent, and the honeycomb cell body deformation may exist when the honeycomb interlayer is laid at the position with large curvature. Research tests show that the honeycomb wall body of the curved cover body part which is not normal affects the penetrating performance of electromagnetic waves, so that the equivalent dielectric constant and the loss of the whole cover body at different positions are uneven, finally, the detection distance of the antenna at different directions of the cover body is deviated, and the accuracy of a detection result is affected.

Disclosure of Invention

For solving because of the current curved surface antenna house lays the honeycomb cell body yielding of plane honeycomb intermediate layer in the cover body, and the honeycomb opening orientation hardly keeps unanimous with the normal direction that the curved surface corresponds the position, it is inhomogeneous to lead to the equivalent dielectric constant and the loss of the whole cover body in different positions, finally leads to the problem that the deviation appears in the different position detection distance of the cover body in the antenna, the utility model provides a normal direction honeycomb intermediate layer antenna house utilizes melting extrusion technology shaping PEEK material to obtain and corresponds position normal direction with the curved surface and keep unanimous honeycomb structure to the cover body coupling through solid skin layer and hot briquetting in the honeycomb structure inside and outside, satisfies the joint strength requirement, is suitable for the industrialization and uses.

The technical scheme of the utility model is that:

the normal honeycomb interlayer radome comprises a radome body and a mounting flange;

the antenna housing body sequentially comprises a housing inner shell, a honeycomb inner skin, a normal honeycomb interlayer, a honeycomb outer skin and a housing outer shell from inside to outside;

the normal honeycomb interlayer is obtained by molding a PEEK material by adopting a melt extrusion process, and the direction of the opening of the honeycomb structure is consistent with the normal direction of the corresponding position of the curved surface of the antenna housing;

the side wall of the single honeycomb structure is provided with air holes;

the honeycomb inner skin and the honeycomb outer skin are PEEK solid core layers obtained by a 3D printing process, and the surfaces after printing are polished, so that the surface roughness is lower than Ra3.2;

the cover body inner shell, the cover body outer shell and the mounting flange are all of fiber cloth covered hot-pressing forming structures.

Furthermore, at the position of the large curvature of the curved surface of the antenna housing, the characteristic size of an opening of the honeycomb structure is reduced, and the density of the honeycomb structure is increased, so that the strength of the position of the large curvature is improved.

Furthermore, the contact position of the mounting flange and the normal honeycomb interlayer is provided with an air hole communicated with the outside.

Furthermore, the thickness of the normal honeycomb interlayer is 2-5 mm, the characteristic size of an opening of the honeycomb structure is 4-8 mm, and the wall thickness of the single honeycomb is 0.3-0.8 mm.

Further, the wall thickness of the honeycomb inner skin and the honeycomb outer skin is 0.4-0.8 mm.

Advantageous effects

The normal honeycomb interlayer radome provided by the utility model has light weight, more excellent wave-transmitting performance and strength required by engineering application; the normal honeycomb interlayer is made of PEEK, so that the honeycomb interlayer has good mechanical property and can resist temperature of 300 ℃ for a long time; the normal honeycomb interlayer is obtained by molding a PEEK material through a melt extrusion process, so that the equivalent dielectric constant and the dielectric loss of the cover body can be further reduced, the consistency of equivalent dielectric characteristics at different positions can be ensured, and the weight can be further effectively reduced; the normal honeycomb interlayer can effectively increase the strength performance of the large-curvature position by encrypting the honeycomb structure at the large-curvature position.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a cross-sectional structure view of an antenna cover, in which 1 is a mounting flange, 2 is a cover outer shell, 3 is a cover inner shell, 4 is a normal honeycomb sandwich, 5 is a honeycomb outer skin, 6 is a honeycomb inner skin, 7 is an air hole, and 8 is a flange mounting hole;

FIG. 2 is a cross-sectional view of a honeycomb sandwich;

fig. 3 is an axial view of the honeycomb sandwich, and 9 is a honeycomb air hole.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

The cover body interlayer inner structure of the current honeycomb interlayer antenna cover is formed by bending and filling flat-plate honeycombs, the honeycomb cell body at a bending part is easy to deform, the honeycomb opening faces to the normal direction corresponding to the curved surface, the normal direction corresponding to the curved surface is difficult to keep consistent, the equivalent dielectric constant and the loss of the whole cover body at different positions are uneven, and finally the antenna is deviated in the detection distances of the cover body in different directions. Therefore, the normal honeycomb sandwich antenna housing is provided in the embodiment, the dielectric constant and the loss are further reduced while the weight is reduced, and meanwhile, the consistency of the dielectric properties of different curved surface positions can be ensured.

As shown in fig. 1, the normal honeycomb sandwich radome is composed of a radome body and a mounting flange.

The antenna housing body sequentially comprises a housing inner shell, a honeycomb inner skin, a normal honeycomb interlayer, a honeycomb outer skin and a housing outer shell from inside to outside.

The normal honeycomb interlayer is obtained by molding a PEEK material through a melt extrusion process, the direction of the opening of the honeycomb structure is consistent with the normal direction of the corresponding position of the curved surface of the antenna housing, and the thickness of the honeycomb structure is 2-5 mm. The characteristic size of the opening of the honeycomb structure is 4-8 mm, the wall thickness of the single honeycomb is 0.3-0.8 mm, and the air hole with the diameter of 0.8mm is designed on the side wall of the single honeycomb structure, so that the sealed cavity formed by printing is prevented from cracking caused by sealed air expansion and contraction under the extreme conditions of negative pressure or high and low temperature, and meanwhile, the weight can be effectively further reduced. And at the big curvature position of antenna house curved surface, reduce honeycomb opening characteristic dimension, increase honeycomb density to improve big curvature position intensity.

And PEEK solid core layers obtained by a 3D printing process are arranged on the inner side and the outer side of the normal honeycomb interlayer to serve as a honeycomb inner skin and a honeycomb outer skin, the thickness of the PEEK solid core layers is 0.4-0.8 mm, the surface of the PEEK solid core layers after printing is polished, and the surface roughness of the PEEK solid core layers is lower than Ra3.2.

The outer side of the skin is also provided with a cover body inner shell and a cover body outer shell which are covered by fiber cloth and are subjected to hot press forming, so that the inner side and the outer side of the honeycomb structure are connected with a cover body which is subjected to hot press forming through a solid skin layer, and the requirement on bonding strength is met.

The mounting flange is also formed by covering and hot-pressing fiber cloth, can be integrally formed with the cover body inner shell and the cover body outer shell during forming, and is provided with air holes communicated with the outside at the contact positions of the mounting flange and the normal honeycomb interlayer, so that balance of internal and external air pressure is ensured.

The normal honeycomb interlayer radome in the embodiment has light weight, more excellent wave-transmitting performance and strength required by engineering application; the normal honeycomb interlayer is made of PEEK, so that the honeycomb interlayer has good mechanical property and can resist temperature of 300 ℃ for a long time; the normal honeycomb interlayer is obtained by molding the PEEK material through a melt extrusion process, and the PEEK material is obtained by molding the PEEK material through the melt extrusion process, so that the equivalent dielectric constant and the dielectric loss of the cover body can be further reduced, the consistency of dielectric properties at different positions can be ensured, and the weight can be further effectively reduced; the normal honeycomb interlayer can effectively increase the strength performance of the large-curvature position by encrypting the honeycomb structure at the large-curvature position.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the invention, and that those skilled in the art may make variations, modifications, substitutions and alterations herein without departing from the spirit and scope of the invention.

Claims

1. A normal honeycomb sandwich layer antenna housing is characterized in that: the antenna housing comprises an antenna housing body and a mounting flange;

the side wall of the single honeycomb structure is provided with air holes;

2. The normal honeycomb sandwich radome of claim 1, wherein: at the position of the large curvature of the curved surface of the antenna housing, the characteristic size of an opening of the honeycomb structure is reduced, and the density of the honeycomb structure is increased, so that the strength of the position of the large curvature is improved.

3. A normal honeycomb sandwich radome according to claim 1 or 2, characterized in that: and air holes communicated with the outside are formed in the contact positions of the mounting flange and the normal honeycomb interlayer.

4. The normal honeycomb sandwich radome of claim 2, wherein: the thickness of the normal honeycomb interlayer is 2-5 mm, the characteristic size of an opening of the honeycomb structure is 4-8 mm, and the wall thickness of the single honeycomb is 0.3-0.8 mm.

5. The normal honeycomb sandwich radome of claim 1, wherein: the wall thickness of the honeycomb inner skin and the wall thickness of the honeycomb outer skin are 0.4-0.8 mm.