A composite cabin with internal flow channel and its assembling process

Abstract

The present application relates to the technical field of composite parts assembly, and particularly relates to a composite cabin with an internal flow channel and an assembly process thereof. The cabin comprises a cabin body and an end frame. The cabin body is provided with a mounting port at one end to mount the end frame. The end frame comprises a cover and a ring-shaped end frame assembly surface. The end frame assembly surface is perpendicular to the cover. The inner wall of the cabin body is provided with an annular groove which is not sealed. The annular groove is sealed by the assembly of the cabin body and the end frame. The sealed annular groove forms an internal flow channel. The coaxiality of the end frame and the cabin body is controlled by the mode of segmental combination of the end frame assembly surface and the cabin body, sealing agent and tool positioning. The end frame is axially inserted into the cabin body by means of the positioning tool. The sealing agent is blocked from flowing into the internal flow channel groove by the sealing ring. The assembly is ensured by the coaxiality of the end frame and the cabin body, and the thickness of the sealing agent is uniform. The technology of the present application improves the maintainability of the composite product with the internal flow channel and brings convenience to the forming of the composite product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite material part assembly, in particular to a composite material cabin body containing an internal flow channel and an assembly process thereof. BACKGROUND

[0002] With the development of aerospace composite material products towards structural and functional integration, the internal structure of the composite material products becomes more and more complex. The internal flow channel is realized by embedding pipelines in the composite material skin, which has the advantages of realizing the structural and functional integration of the composite material product, playing an important role in the overall weight optimization and space layout optimization of the composite material product. However, the production process of the composite material product is complex, and the product is once-solidified and formed. Once the internal flow channel is damaged or blocked, subsequent after-sales maintenance cannot be performed. For expensive composite material products, maintainability is one of the important standards for evaluating the design of a composite material product and is also the pursuit of product design. In order to improve the maintainability of the composite material product with the internal flow channel and to bring convenience to the forming of the composite material product, the internal flow channel part of the composite material product is currently split into two composite material parts for sealed assembly. This method has high requirements for the sealed assembly process, and the sealant is easy to flow into the internal flow channel groove to form excess material. SUMMARY

[0003] In order to consider the maintainability of expensive composite material products in the later stage, the embodiments of the present application provide a composite material cabin body containing an internal flow channel and an assembly process thereof. The annular groove on the inner wall of the cabin body main body is sealed to form an internal flow channel by combined assembly, and the sealant is prevented from flowing into the internal flow channel groove by a sealing ring. This method not only facilitates the disassembly and maintenance of the composite material product in the later stage, but also brings convenience to the forming of the composite material product parts.

[0004] In a first aspect, the embodiments of the present application provide a composite material cabin body, which comprises a cabin body main body and an end frame.

[0005] One end of the cabin body main body is provided with a mounting port for mounting the end frame. The end frame comprises a cover and an annular end frame assembly surface. The end frame assembly surface is vertically arranged on the cover. An annular groove for placing pipelines is arranged on the inner wall of the end of the cabin body main body close to the mounting port. The predetermined position of the end frame assembly surface and the side of the annular groove away from the mounting port are respectively coated with a sealant. After the end frame assembly surface is completely inserted into the mounting port, the two sealants are respectively located on the two sides of the annular groove, so as to seal the annular groove by cooperation of the sealants on the two ends and the outer wall of the end frame assembly surface.

[0006] In a possible design, the difference between the inner radius of the inner wall of the cabin body main body and the outer radius of the end frame assembly surface is a predetermined distance. After the end frame is coaxially assembled into the cabin body main body, a gap exists between the end frame assembly surface and the inner diameter of the cabin body main body to provide space for the sealant layer.

[0007] In one possible design, before assembly, the thickness of the two layers of sealant is greater than the preset distance, so that after the end frame is assembled into the main body of the cabin, the two layers of sealant are fully pressed and adhered to the inner walls of the main body of the cabin on both sides and the outer walls of the end frame assembly surface.

[0008] In one possible design, a sealing ring is provided on the side of the annular groove near the mounting port. The portion of the sealing ring protruding from the main body of the cabin should be greater than the thickness of the applied sealant, so that the sealing ring can block the sealant during assembly and prevent the sealant applied to the end frame mounting surface from entering the annular groove during assembly.

[0009] In one possible design, after the end frame and the main body of the cabin are assembled, countersunk screws are used to pass through the assembly surface of the end frame and the main body of the cabin in sequence to fix the two together.

[0010] In one possible design, the countersunk screw is positioned at the two layers of sealant.

[0011] In one possible design, the cover is provided with an access port for allowing personnel or equipment to enter the interior of the cabin body to install the countersunk screws.

[0012] Secondly, embodiments of the present invention also provide a method for preparing a composite material cabin, used to prepare any of the composite material cabins described above, the preparation method comprising:

[0013] Apply an adhesive primer to the end frame mounting surface and the side of the annular groove away from the mounting opening;

[0014] After the adhesive primer has dried, a sealant is applied over the adhesive primer.

[0015] Insert the end frame into the main body of the cabin through the mounting port;

[0016] The end frame assembly surface and the main body of the cabin are fixed together by countersunk screws passing through them in sequence.

[0017] Perform a curing process.

[0018] In one possible design, inserting the end frame into the cabin body through the mounting port includes:

[0019] The end frame is inserted into the main body of the cabin through the mounting port using a positioning fixture, so that the end frame and the main body of the cabin are coaxial. The positioning fixture includes a guide rail, a positioning plate, and a positioning ring. The positioning plate is fixed to the end frame with bolts, and the positioning ring is sleeved on the outside of the main body of the cabin. The guide rail connects the positioning plate and the positioning ring, so that the positioning plate and the positioning ring are coaxial and can slide along the axis.

[0020] In one possible design, the method of securing the end frame mounting surface and the hull body by sequentially passing countersunk screws through them includes:

[0021] After the end frame reaches the preset position, the countersunk screws are initially tightened;

[0022] When the sealant is in a semi-cured state, tighten the countersunk screws again.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] The technology provided in this application improves the maintainability of composite products with internal flow channels and facilitates the molding of composite products, providing a feasible solution for the production of composite products with internal flow channels. Specifically, the main body of the chamber is provided with an annular groove. In order to achieve the purpose of sealing the space of the annular groove, an end frame mounting surface is provided on the cover. After the end frame mounting surface is inserted into the main body of the chamber, the pre-coated sealant is located on both sides of the annular groove. The two sections of sealant, together with the end frame mounting surface, achieve the sealing of the annular groove. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Fig. 1 This is a structural schematic diagram of a composite material cabin provided in an embodiment of the present invention;

[0027] Fig. 2 This is a schematic diagram of the installation structure of a composite material cabin provided in an embodiment of the present invention;

[0028] Fig. 3 This is a partial structural schematic diagram of a composite material cabin provided in an embodiment of the present invention.

[0029] In the picture:

[0030] 1-Cap; 2-End frame assembly surface; 3-Main body of the cabin; 4-Sealant; 5-Annular groove; 6-Sealing ring; 7-Positioning plate; 8-Positioning ring; 9-Guide rail; 10-Counterhead screw; 11-Bolt. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or stated, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0033] In this specification, it should be understood that the directional terms such as "upper" and "lower" used in the description of the embodiments of the present invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. Furthermore, in the context, it should also be understood that when it is mentioned that one element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0034] like Figs. 1 to 3 As shown, an embodiment of the present invention provides a composite material cabin, including a cabin body 3 and an end frame;

[0035] The main body 3 of the cabin has an installation port at one end for installing an end frame. The end frame includes a cover 1 and an annular end frame mounting surface 2. The end frame mounting surface 2 is vertically mounted on the cover 1. The inner wall of the end of the main body 3 near the installation port has an annular groove 5 for placing pipelines. The preset position of the end frame mounting surface 2 and the side of the annular groove 5 away from the installation port are respectively coated with sealant 4. After the end frame mounting surface 2 is fully inserted into the installation port, the two sealants 4 are located on both sides of the annular groove 5, so that the sealants 4 at both ends and the outer wall of the end frame mounting surface 2 cooperate to seal the annular groove 5.

[0036] The technology provided in this application improves the maintainability of composite products with internal flow channels and facilitates the molding of composite products, providing a feasible solution for the production of composite products with internal flow channels. Specifically, the main body of the chamber is provided with an annular groove 5. In order to achieve the purpose of spatial sealing of the annular groove 5, an end frame assembly surface 2 is provided on the cover 1. After the end frame assembly surface 2 is inserted into the main body of the chamber 3, the pre-coated sealant 4 is located on both sides of the annular groove 5. The two sections of sealant 4, together with the end frame assembly surface 2, achieve the sealing of the annular groove 5.

[0037] In some embodiments of the present invention, the difference between the inner radius of the inner wall of the main body 3 and the outer radius of the end frame mounting surface 2 is a preset distance, so that after the end frame is coaxially assembled into the main body 3, there is a gap between the end frame mounting surface 2 and the inner diameter of the main body 3, so as to provide space for the sealant 4 layer.

[0038] In this embodiment, in order to achieve sealing by the sealant 4, the sealant 4 needs to have a certain thickness. Therefore, space needs to be reserved for the sealant 4 according to the requirements.

[0039] In some embodiments of the present invention, before assembly, the thickness of the two layers of sealant 4 is greater than a preset distance, so that after the end frame is assembled into the main body 3, the two layers of sealant 4 are fully pressed and adhered to the inner wall of the main body 3 and the outer wall of the end frame assembly surface 2 on both sides.

[0040] In this embodiment, in order for the sealant 4 to fully contact the walls to be sealed on both sides, the sealant 4 needs to be slightly larger than the preset distance, so that the walls on both sides squeeze the sealant 4, thereby making full contact and bonding a seal.

[0041] In some embodiments of the present invention, a sealing ring 6 is provided on the side of the annular groove 5 near the installation port. The portion of the sealing ring 6 protruding from the main body of the cabin should be greater than the thickness of the applied sealant, so that the sealing ring 6 can block the sealant during the assembly process, thereby preventing the sealant 4 applied on the end frame assembly surface 2 from entering the annular groove 5 during the assembly process.

[0042] In this embodiment, in order to prevent the sealant 4 from flowing into the annular groove 5, a sealing ring 6 needs to be provided on the insertion side of the annular groove 5. The sealing ring 6 has sufficient thickness to form a compression between the sealing ring 6 and the end frame assembly surface 2, thereby achieving the effect of blocking the sealant 4 on the end frame assembly surface 2 during the insertion process.

[0043] In some embodiments of the present invention, after the assembly of the end frame and the main body 3 is completed, the two are fixed by passing countersunk screws 10 through the end frame assembly surface 2 and the main body 3 in sequence.

[0044] In some embodiments of the present invention, the countersunk screw 10 is located at the two layers of sealant 4.

[0045] In some embodiments of the present invention, the cover 1 is provided with an operating hole for allowing personnel or equipment to enter the interior of the cabin body 3 to install countersunk screws 10.

[0046] Secondly, embodiments of the present invention also provide assembly process parameters for a composite material cabin containing an internal flow channel, the specific parameters including:

[0047] Apply adhesive primer to the side of the end frame assembly surface 2 and the annular groove 5 away from the mounting opening;

[0048] After the adhesive primer has dried, apply sealant 4 over the adhesive primer;

[0049] Insert the end frame into the main body 3 of the cabin through the installation port;

[0050] The countersunk screws 10 are passed through the end frame assembly surface 2 and the main body 3 in sequence to fix the two together;

[0051] Perform a curing process.

[0052] In some embodiments of the present invention, inserting the end frame into the main body 3 of the cabin through the mounting port includes:

[0053] The end frame is inserted into the main body 3 of the cabin through the installation port using a positioning fixture, so that the end frame and the main body 3 of the cabin are coaxial. The positioning fixture includes a guide rail 9, a positioning plate 7, and a positioning ring 8. The positioning plate 7 is fixed to the end frame with bolts, and the positioning ring 8 is sleeved on the outside of the main body 3 of the cabin. The guide rail 9 passes through the positioning plate 7 and the positioning ring 8, so that the positioning plate 7 and the positioning ring 8 are coaxial and can slide along the axis.

[0054] In some embodiments of the present invention, countersunk screws 10 are used to sequentially pass through the end frame mounting surface 2 and the cabin body 3 to fix the two together, including:

[0055] After the end frame reaches the preset position, initially tighten the countersunk screws 10;

[0056] When the sealant is in a semi-cured state, tighten the countersunk screw 10 again.

[0057] Specifically, the end frame assembly surfaces and assembly holes of the composite material end frame and the composite material cabin body 3 are machined according to the drawing requirements.

[0058] The groove for storing sealing ring 6 is machined into the composite material cabin as required by the drawings.

[0059] After the end frame assembly surface, assembly holes and grooves are machined, the flash is ground to remove any visible burrs.

[0060] Wipe the end frame assembly surfaces, assembly holes, and grooves with an acetone-soaked cloth, ensuring the cloth is free of visible particles.

[0061] Place the sealing ring 6 in the groove on the assembly surface of the end frame of the composite material cabin body. Before placing the sealing ring 6, the groove on the assembly surface of the composite material end frame should be cleaned with an air gun and wiped clean with a cloth soaked in acetone. The sealing ring 6 should be wiped clean with acetone and dried before placement. The part of the sealing ring 6 that protrudes from the cabin body should be greater than the thickness of the applied sealant to ensure the sealing ring 6's blocking effect on the sealant.

[0062] The composite material end frame and the composite material cabin body 3 were trial-assembled. Any areas that did not fit properly were cleaned by grinding and wiping with acetone as described above.

[0063] The composite material end frame and the composite material cabin body 3 are positioned and controlled at multiple points using positioning fixtures, and their concentric axes are aligned.

[0064] Wipe the composite end frame assembly surface with a cloth dampened with acetone until no visible particles remain on the cloth surface. After wiping, let it stand for 30 minutes to allow the end frame assembly surface to fully dry.

[0065] Apply adhesive primer to the end frame assembly surfaces. Apply the adhesive primer evenly to the assembly surfaces of the composite material end frame and the composite material cabin end frame with a brush. After application, allow it to dry for 30 minutes. During the operation and after application, it is strictly forbidden to touch the end frame assembly surfaces with your hands. If the end frame assembly surfaces are contaminated, the contaminated assembly surfaces must be re-coated with adhesive primer.

[0066] Prepare the sealant according to the instructions. For multi-component sealants, strictly follow the instructions for mixing. Weigh the components using an electronic scale (accuracy not less than 0.01 grams) in an environment free from external interference. After weighing, thoroughly stir all components and allow the sealant to reach a semi-fluid state before use.

[0067] Apply sealant, ensuring the sealant thickness is slightly greater than the assembly gap.

[0068] The main body 3 of the composite material cabin is fixed in place. The composite material end frame is axially pushed into the composite material cabin using the positioning tool guide rail 9. The assembly limit is completed using the plane of the composite material end frame until the flange surface of the composite material end frame is in contact with the end face of the composite material cabin.

[0069] Install countersunk screws 10 and tighten them with a torque wrench. Initially tighten with a torque wrench (1-2 N·m) to allow sealant to be evenly squeezed out from the end frame mounting surface.

[0070] Refer to the sealant curing time instructions. When the sealant is in a semi-cured state, tighten the countersunk screws again with a torque wrench (8-10 N·m).

[0071] After assembly, follow the sealant instructions for subsequent curing.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite material cabin containing an internal flow channel, characterized in that, Including the main body of the cabin and the end frames; The main body of the cabin is provided with an installation port at one end for installing the end frame. The end frame includes a cover and an annular end frame mounting surface. The end frame mounting surface is perpendicular to the cover. The inner wall of the main body of the cabin near the installation port is provided with an annular groove. A sealant is applied to a preset position of the end frame mounting surface and the side of the annular groove away from the installation port. After the end frame mounting surface is fully inserted into the installation port, the two sealants are located on both sides of the annular groove so that the sealants at both ends and the outer wall of the end frame mounting surface cooperate to seal the annular groove and form an inner flow channel. A sealing ring is provided on the side of the annular groove near the mounting port. The portion of the sealing ring protruding from the main body of the cabin should be greater than the thickness of the applied sealant, so that the sealing ring can block the sealant during assembly and prevent the sealant applied to the end frame mounting surface from entering the annular groove during assembly.

2. The composite material cabin according to claim 1, characterized in that, The difference between the inner radius of the inner wall of the main body of the cabin and the outer radius of the end frame mounting surface is a preset distance, so that after the end frame is coaxially assembled into the main body of the cabin, there is a gap between the end frame mounting surface and the inner diameter of the main body of the cabin, so as to provide space for the sealant layer.

3. The composite material cabin according to claim 2, characterized in that, Before assembly, the thickness of the two layers of sealant is greater than the preset distance, so that after the end frame is assembled into the main body of the cabin, the two layers of sealant are fully pressed and adhered to the inner wall of the main body of the cabin on both sides and the outer wall of the end frame assembly surface.

4. The composite material cabin according to claim 1, characterized in that, After the end frame and the main body of the cabin are assembled, countersunk screws are used to pass through the assembly surface of the end frame and the main body of the cabin in sequence to fix them together.

5. The composite material cabin according to claim 4, characterized in that, The countersunk screw is located at the junction of the two layers of sealant.

6. The composite material cabin according to claim 4, characterized in that, The cover is provided with an operating hole for allowing personnel or equipment to enter the interior of the cabin body to install the countersunk screws.

7. An assembly process for a composite material cabin containing an internal flow channel, characterized in that, For assembling the composite material cabin body according to any one of claims 1-6, the assembly process includes: Apply an adhesive primer to the end frame mounting surface and the side of the annular groove away from the mounting opening; After the adhesive primer has dried, a sealant is applied over the adhesive primer. Insert the end frame into the main body of the cabin through the mounting port; The end frame assembly surface and the main body of the cabin are fixed together by countersunk screws passing through them in sequence; Perform a curing process.

8. The assembly process according to claim 7, characterized in that, The step of inserting the end frame into the main body of the cabin through the mounting port includes: The end frame is inserted into the main body of the cabin through the mounting port using a positioning fixture, so that the end frame and the main body of the cabin are coaxial. The positioning fixture includes a guide rail, a positioning plate, and a positioning ring. The end frame is fixed to the positioning plate by bolts. The positioning ring is sleeved on the outside of the main body of the cabin. The guide rail connects the positioning plate and the positioning ring, so that the positioning plate and the positioning ring are coaxial and can slide along the axis.

9. The assembly process according to claim 7, characterized in that, The method of fixing the end frame assembly surface and the cabin body by sequentially passing countersunk screws through them includes: After the end frame reaches the preset position, the countersunk screws are initially tightened; When the sealant is in a semi-cured state, tighten the countersunk screws again.

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