JP6002069B2 - Method for manufacturing air conditioning duct for aircraft and method for reinforcing air conditioning duct for aircraft - Google Patents

Description

  The present invention relates to an aircraft air conditioning duct and a method for reinforcing an aircraft air conditioning duct, and in particular, an aircraft air conditioning duct capable of easily reinforcing a duct body made of a composite material and having a rectangular cross section, and the air conditioning The present invention relates to a method for reinforcing a duct.

  In recent years, various weight reductions of aircraft have been studied, and as a part thereof, replacement of metal parts and the like with composite materials has been performed. A general composite material is made by impregnating a fiber material, which is a reinforcing material, with a thermosetting resin composition, which is a matrix (base material), and curing it. In addition to being lighter than a metal material, It also has an excellent surface.

  Here, an aircraft is usually equipped with an air conditioner (air conditioner) to adjust the air temperature, pressure, etc. of the pressurized space in the aircraft (air conditioner). Air conditioning ducts made of composite materials are used.

  An example of such an air conditioning duct made of a composite material is a multilayer duct for an air conditioning system disclosed in Patent Document 1. This multilayer duct exhibits sufficient airtightness (fluid tightness), and in order to obtain a duct that is as light as possible, a polymer film, a cured structural layer made of composite material, an optional functional layer (conductive layer) In addition, a layer made of a composite material can be used as a functional layer as well as a cured structure layer.

  By the way, as an air-conditioning duct of some aircraft, what has a rectangular-shaped cross section (square duct) is used in the space partitioned by the plane. Since this square duct can secure a larger cross-sectional area than that having a circular cross section (round duct), it can be used to effectively use the limited space inside the aircraft, especially in small aircraft. Is preferred. However, since the square duct is easier to deform than the round duct, reinforcement is performed as necessary.

JP 2005-308222 A

  When reinforcing an aircraft air conditioning duct made of a composite material, a method is generally used in which a plate-shaped honeycomb core material is bonded to a reinforcing portion (the outer surface of the duct main body) and heat-cured by an autoclave. The honeycomb core material is used as a core material of a sandwich structure and is lightweight and has a suitable strength. Sufficient reinforcement is possible by firmly attaching this to the outer surface of the duct body by an autoclave. However, since this method requires an autoclave facility for heat-curing the composite material, the manufacturing cost is high, and the manufacturers that can manufacture the material are also limited.

  The present invention has been made to solve such a problem, and it is possible to reinforce an air conditioning duct for an aircraft by a low-cost and relatively simple method while suppressing an increase in weight and occupied space. Objective.

  An air conditioning duct for an aircraft according to the present invention is an air conditioning duct used in an air conditioning facility for an aircraft in order to solve the above-described problem, and is made of a composite material made of a thermosetting resin composition reinforced by a fiber material. A duct body having a rectangular cross-sectional shape, and a flange portion made of a composite material provided so as to circulate on an outer peripheral surface excluding both ends and connection portions of the duct body, and the flange portion Is configured so as to be fixed to the duct main body by being configured as a separate body from the duct main body and then adhered by an adhesive.

  According to the said structure, a reinforcement location can be reinforced only by fixing a flange part to the outer periphery of the reinforcement location of a duct main body with an adhesive agent. In addition, the flange portion which is a reinforcing structure does not cause a significant increase in weight and occupied space, and it is not necessary to use an autoclave for reinforcement. Therefore, an increase in weight and occupied space can be suppressed, and the air conditioning duct for aircraft can be reinforced favorably by a low-cost and relatively simple method.

  In the aircraft air conditioning duct, the flange portion is provided with a notch, and the notch is configured such that a fixing tool for fixing the duct body can be attached to the inside of the aircraft. Also good.

  Further, the air conditioning duct for an aircraft further includes a rod support portion provided at a location excluding a location where the flange portion is fixed in the duct body, and supporting an internal interval of the duct body, the rod support The part may be configured by inserting a rod member made of a composite material into the duct body and fixing both ends of the rod body to the duct body with an adhesive.

  An aircraft air-conditioning duct reinforcing method according to the present invention is a method for reinforcing an air-conditioning duct used in an air-conditioning equipment for an aircraft in order to solve the above-described problem, and the duct main body of the air-conditioning duct is made of fiber. A flange made of a composite material made of a reinforced thermosetting resin composition and configured as a separate body from the duct body, and an outer periphery of a reinforcing portion excluding both ends of the duct body and connection portions It is the structure which adhere | attaches and fixes on a surface with an adhesive agent.

  In the reinforcing method having the above-described configuration, a rod member made of a composite material is inserted into the duct main body at a portion other than a portion where the flange portion is fixed among the reinforcing portions of the duct main body, and both ends thereof are connected to the duct main body. A structure may be provided in which a rod support portion for supporting the internal space of the duct body is provided by fixing with an adhesive.

  As described above, the present invention has an effect that the air conditioning duct for an aircraft can be reinforced by a low-cost and relatively simple method while suppressing an increase in weight and occupied space.

It is a perspective view showing an example of composition of an air-conditioning duct for airplanes concerning an embodiment of the invention. (A) is a typical process drawing which shows the outline of the reinforcement method of the air-conditioning duct for aircrafts shown in FIG. 1, (b) is a schematic process drawing which shows the outline of the method of sticking and reinforcing a honeycomb core material. It is. It is a schematic sectional drawing which shows an example of a structure of the rod support part with which the air conditioning duct for aircrafts shown in FIG. 1 is provided. It is a modification of the air conditioning duct for aircraft shown in FIG. 1, and is a schematic diagram showing an example of a configuration for attaching the air conditioning duct to the aircraft body.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

[Configuration of air conditioning duct]
First, an example of an aircraft air conditioning duct (hereinafter simply referred to as an air conditioning duct) according to the present embodiment will be described in detail with reference to FIG. As shown in FIG. 1, the air-conditioning duct 10 includes a composite material flange body 12 as well as a composite material duct body 11 and a composite material rod support portion 13. Used.

  The duct body 11 has a rectangular cross-sectional shape and is called a so-called square duct or rectangular duct. A specific cross-sectional shape is generally a rectangular shape or a trapezoidal shape close to a rectangle, but may be a square shape. That is, the rectangular shape in the present invention includes not only a rectangular shape but also a square shape or a trapezoidal shape. Further, the rectangular shape does not mean that the corners of the four sides are right angles like a rectangle or a square as a figure, and each corner portion forms a curve (R) as shown in FIG. It may be configured as follows.

  A duct main body 11 shown in FIG. 1 includes a main duct body 111 having a large cross-sectional area, and a branch pipe duct main body 112 branched from the main duct main body 111 and having a small cross-sectional area. Of course, the duct body 11 is not limited to this configuration, and may be composed of only the main duct body 111, may have two or more branch duct bodies 112, and may have two or more main pipes. The duct main body 111 may be connected to each other.

  The flange portion 12 is provided on the outer periphery of the duct body 11 (more specifically, the main duct body 111). In the example shown in FIG. 1, four flange portions 12 are provided at substantially equal intervals. The flange portion 12 is configured to reinforce the duct main body 11 and may be provided so as to go around on the outer peripheral surface of the reinforcing portion of the duct main body 11. Further, as will be described later, the flange portion 12 may not cut around the entire outer peripheral surface of the duct body 11 and may be partially cut away.

  The flange portion 12 as a reinforcing structure is not provided at both ends of the duct body 11. For example, in FIG. 1, the connecting flange 14 is provided at the end of the branch duct body 112, but the flange portion 12 according to the present invention is different from the connecting flange 14 in that the duct body 11 is recessed. It functions as a reinforcing structure that suppresses deformation such as swelling. Therefore, when the air conditioning duct 10 is configured by connecting a plurality of duct main bodies 11, the flange portion 12 is not provided at the end portion and the connection portion.

  The flange portion 12 is fixed to the duct main body 11 by being configured as a separate body from the duct main body 11 and bonded by an adhesive. This point will be described later. Further, the cross-sectional shape of the flange portion 12 is not particularly limited, and depending on the conditions such as the degree of reinforcement required for the reinforcing portion and the occupied space (allowable space) allowed for the flange portion 12, Z-type, L-type, A known shape such as a hat shape is preferably used. Further, the thickness of the flange portion 12 is not particularly limited, and a sufficient reinforcing strength can be realized with a thickness of about 2 to 3 mm if it is made of a general composite material.

  In the present embodiment, the rod support portion 13 is provided in the branch pipe duct main body 112 and functions as a reinforcing structure that suppresses deformation of the branch pipe duct main body 112. A specific configuration of the rod support portion 13 will be described later.

  The duct body 11, the flange portion 12, and the rod support portion 13 are all made of a composite material. The composite material in the present invention comprises a thermosetting resin composition reinforced with a fiber material.

  As a specific composite material, first, the thermosetting resin that is the main component of the base material is a thermosetting resin such as epoxy resin, bismaleimide resin, vinyl ester resin, unsaturated polyester resin, phenol resin, silicone resin, etc. Is mentioned. These resins may be used alone or in combination of a plurality of types as appropriate. The thermosetting resin composition as a base material may contain various additives such as a solvent, a curing agent, and a curing accelerator in addition to the thermosetting resin. Examples of fiber materials that are reinforcing materials include carbon fibers, polyester fibers, PBO (polyparaphenylene benzobisoxazole) fibers, boron fibers, aramid fibers, glass fibers, silica fibers (quartz fibers), and silicon carbide (SiC) fibers. , Nylon fibers, and the like. Only one kind of these fiber materials may be used, or a plurality of kinds may be used in combination as appropriate.

  The duct body 11, the flange portion 12, and the rod support portion 13 may be made of different composite materials, but are preferably made of the same type of composite material. Thereby, since the integrity of the duct main body 11 and the flange part 12 and the rod support part 13 which are reinforcement structures improves, the state reinforced as the whole air-conditioning duct 10 can be stabilized.

  The manufacturing method of the duct main body 11, the flange part 12, and the rod support part 13 is not specifically limited, Usually, it is plied up to a desired shape by a prepreg, and is heated and cured while being pressurized with an autoclave, or is cured by natural drying. A known method can be suitably used.

[Method of reinforcing air-conditioning duct]
Next, a method for manufacturing the air conditioning duct 10 having the above-described configuration, in other words, a method for reinforcing the air conditioning duct 10 (duct body 11) will be specifically described with reference to FIGS. 2 (a) and 2 (b). 2A is an example of the reinforcing method of the present embodiment, but in FIG. 2B, a plate-shaped honeycomb core material 502 is used as a reinforcing portion as a comparison with the reinforcing method of the present embodiment. The reinforcing method to stick is illustrated.

  In the present embodiment, as shown in FIG. 2A, two flange pieces 121 configured separately from the duct main body 11 are arranged so as to circulate on the outer peripheral surface of the duct main body 11, Are connected to each other and fixed on the outer peripheral surface with an adhesive, whereby one flange portion 12 is attached, and the air conditioning duct 10 according to the present embodiment is manufactured. Although the adhesive is not shown in FIG. 2A, the specific type of the adhesive is not particularly limited, and a known epoxy resin-based adhesive can be suitably used.

  On the other hand, in the reinforcing method shown in FIG. 2 (b), the honeycomb core material 502 is attached to the reinforcing portion of the duct body 11 (small arrow in the figure), and is pressed with the autoclave equipment 500 (schematically shown in the frame in the figure). It will heat cure. The comparative air conditioning duct 50 obtained is not reinforced with a frame like the air conditioning duct 10 according to the present embodiment, but is reinforced by the surface of the honeycomb core material 502.

  In this reinforcement method, since the autoclave equipment 500 is essential, the air conditioning duct 10 cannot be reinforced at any time as in the reinforcement method according to the present invention, and only at a specific place (a factory or the like) where the autoclave equipment 500 is located. The reinforcement method cannot be implemented.

  On the other hand, in the reinforcing method according to the present invention, the flange portion 12 can be provided by fixing a plurality of flange pieces 121 to the duct main body 11 later, so that the reinforcing portion of the single duct main body 11 is provided at the reinforcing portion. Depending on the required strength, various flange portions 12 such as Z-type, L-type, and hat-type can be freely provided. Therefore, compared to a reinforcing method using the autoclave equipment 500, etc., not only can the reinforcement be easily performed at a low cost, but also the degree of reinforcement can be improved.

[Rod support part]
Next, an example of the structure of the rod support part 13 provided in the branch pipe duct main body 112 among the reinforcement structure of the air-conditioning duct 10 mentioned above is demonstrated concretely with reference to FIG.

  Since the space that can be occupied is small on the outer peripheral surface of the branch duct main body 112, it is difficult to provide the flange portion 12 like the main duct main body 111. Thus, in the duct main body 11, the internal space of the duct main body 11 is supported as shown in FIG. A rod support portion 13 is provided.

  The reinforcing method by the rod support portion 13 will be described. First, a rod member 131 made of a composite material is inserted from the outside of the duct main body 11 (the branch pipe duct main body 112 in FIG. 3), and both ends thereof are fixed with an adhesive 133. . Thereby, as shown in FIG. 3, the rod support part 13 which supports the internal space | interval of the duct main body 11 uniformly is comprised.

  Here, in order to satisfactorily fix both ends of the rod member 131 to the duct body 11, washers 132 may be attached to both ends of the rod member 131 as shown in FIG. By adhering the washer member 132 to the duct main body 11 with the adhesive 133, the adhesion area can be increased, so that the other end of the rod member 131 can be favorably fixed to the duct main body 11, and the rod support The reinforcing action by the part 13 can be improved.

  The rod member 131 and the washer member 132 may be made of the same composite material as that of the duct body 11 as described above, but may be composite materials having different materials as necessary. Moreover, as the adhesive 133, the same thing as what attaches the flange part 12 (flange piece 121) to the duct main body 11, for example, an epoxy resin adhesive can be used suitably. Further, when the air conditioning duct 10 is used under the condition that only negative pressure acts, the rod member 131 may be divided into two instead of one.

  Thus, according to the present invention, the flange portion 12 is fixed to the outer periphery of the reinforcing portion of the duct body 11 with an adhesive, or if the flange portion 12 cannot be provided, only the rod support portion 13 is provided. The reinforcing part can be reinforced. In addition, the flange portion 12 and the rod support portion 13 which are a reinforcing structure do not cause a significant increase in the weight and occupied space of the air conditioning duct 10, and it is not necessary to use an autoclave for reinforcement. Therefore, an increase in weight and occupied space can be suppressed, and the air conditioning duct for aircraft can be reinforced favorably by a low-cost and relatively simple method.

[Modification]
In the example shown in FIG. 2A described above, one flange portion 12 is composed of two flange pieces 121a and 121b, but the flange piece 121 constituting the flange portion 12 is as shown in FIG. Alternatively, it may be three or more. In the example shown in FIG. 4, one flange portion 12 includes a flange piece 121 a corresponding to about half of the outer peripheral surface of the duct body 11 and a flange piece corresponding to about ３ including the corner portion of the remaining half. It consists of a total of three, 121c and 121d.

  In addition, when there are too many flange pieces 121 which comprise the flange part 12, there exists a possibility that the effort which comprises the one flange part 12 on the outer peripheral surface of the duct main body 11 may increase. Therefore, from the viewpoint of avoiding complication of the reinforcing process, the number of the flange pieces 121 is preferably about 4 or less.

  Here, as for the flange piece 121, it is preferable that a joint (connection site | part) is not located in the corner | angular part vicinity of a rectangular cross section. In other words, the flange piece 121 preferably has a shape (L-shaped or U-shaped) that sandwiches at least one corner of a rectangular cross section. Thereby, since the circumference | surroundings of the duct main body 11 can fully be reinforced with the flange part 12 connected to one, reinforcement property can be improved more. Therefore, the number of the flange pieces 121 is preferably 4 or less from this viewpoint.

  Also, as shown in FIG. 4, a notch 15 (dotted arrow in the figure) is provided between the flange piece 121c and the flange piece 121d, and this notch 15 is provided in the duct inside the aircraft. A fixing tool for fixing the main body 11 can be attached. In the example shown in FIG. 4, a part of the aircraft main body 20 is schematically illustrated in a columnar shape, and a metal plate 31 is fixed to the flange portion 12 by a known fastener member 33 in the notch portion 15. The metal plate 31 is similarly fixed to the fixing bracket 32 by a fastener member 33, and the fixing bracket 32 is fixed to a part of the aircraft main body 20 by the fastener member 33.

  Thus, by providing the notch 15 in the flange part 12, the flange part 12 as a reinforcement structure can be used also as a duct fixing flange. In addition, the specific structure of the metal plate 31 and the fixture 32 is not specifically limited, For example, what is well-known in the aircraft field | area, for example, made from aluminum or its alloy can be used suitably. Alternatively, instead of the metal plate 31 and the fixture 32, a composite material plate and a composite material fixture having the same shape can be used. Moreover, the dimension of the notch of the notch 15 is not particularly limited as long as the metal plate 31 and the fixing bracket 32 capable of stably fixing the air conditioning duct 10 to the aircraft body 20 can be attached.

  In addition, as in the present embodiment, the air conditioning duct 10 may be attached using the metal plate 31 and the fixing bracket 32. However, the fixing configuration of the air conditioning duct 10 is not limited to this, for example, via the fixing bracket 32. Alternatively, the metal plate 31 can be directly fixed to the aircraft body 20 with the fastener member 33.

  It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications are possible within the scope shown in the scope of the claims, and are disclosed in different embodiments and a plurality of modifications. Embodiments obtained by appropriately combining the technical means are also included in the technical scope of the present invention.

  The present invention can be suitably used widely in the field of aircraft air-conditioning ducts, and in particular, can be suitably used in the field of air-conditioning ducts for small aircraft.

10 Air Conditioning Duct for Aircraft (Air Conditioning Duct)
11 Duct body 12 Flange part 13 Rod support part 15 Notch part 31 Metal plate (fixing tool)
32 Fixing bracket (fixing tool)
111 Main pipe duct body 112 Branch pipe duct body 121 Flange fragment 131 Rod member 132 Washer member 133 Adhesive

Claims (3)

A method of manufacturing an air conditioning duct used in an air conditioning system of an aircraft,
The air conditioning duct is
A duct body made of a composite material composed of a thermosetting resin composition reinforced with a fiber material, the cross-sectional shape of which is a rectangular shape;
A flange portion made of a composite material provided so as to circulate on the outer peripheral surface excluding both ends and the connection portion of the duct body,
The flange portion is configured as a separate body from the duct body, and then bonded by an adhesive, thereby fixing the flange portion to the duct body .
Furthermore, the air-conditioning duct is provided at a location excluding the location where the flange portion is fixed in the duct body, and includes a rod support portion that supports an internal interval of the duct body,
The composite material of the rod member is inserted into the duct body, and wherein the Rukoto provided with the rod support portion by fixing the both ends with an adhesive to the duct body,
A method for manufacturing an air conditioning duct for an aircraft. The flange is provided with a notch,
The notch is configured such that a fixing tool for fixing the duct body can be attached to the inside of the aircraft.
The manufacturing method of the air-conditioning duct for aircrafts of Claim 1. A method for reinforcing an air-conditioning duct used in an air-conditioning system for an aircraft,
The duct body of the air conditioning duct is made of a composite material made of a thermosetting resin composition reinforced with fibers,
While fixing the flange portion made of a composite material configured separately from the duct body, on the outer peripheral surface of the reinforcing portion excluding both ends and the connection portion of the duct body by an adhesive ,
Of the reinforcing parts of the duct body, except for the place where the flange portion is fixed,
A rod member made of a composite material is inserted into the duct main body, and both ends thereof are fixed to the duct main body with an adhesive, thereby providing a rod support portion that supports an internal interval of the duct main body .
A method of reinforcing an air conditioning duct for an aircraft.

Images