Aircraft air conditioning system air duct

FIELD: aircraft engineering.

SUBSTANCE: proposed air duct can feed air in the temperature range of minus 55C to plus 85C and at load with pressure difference relative to aircraft cabin inside pressure not exceeding 500 GPa. Air duct outer or inner side is furnished with multi-layer reinforcing coat. Every layer has a number of coils formed by at least one continuous fiber. Coils of layers arranged one above another are wound in opposite directions to form the coat cellular structure. Air duct is made from foamed or dense plastic material. Aforesaid continuous fibers are enclosed by matrix made from either thermosetting plastic or thermoplastic polymer. Distance between said coils or angle of inclination between them and air duct lengthwise axis varies along said axis to change coils density along air duct lengthwise axis depending upon local requirements to air duct mechanical strain.

EFFECT: air duct reduced weight and increased strength.

12 cl, 8 dwg

 

The technical field to which the invention relates.

The invention relates to a duct for air conditioning of an aircraft, air feed, in particular in the temperature range from -55C to +85C and under load due to the pressure difference relative to the pressure in the cabin of an aircraft, does not exceed 500 hPa.

The level of technology

In the known solutions the implementation of the air ducts for air conditioning the interior space of the passenger cabin in an aircraft strengthened, for example, reinforced fiberglass cured products, which are made of phenolic resin ("prepregs") in the form of joined halves or tubular structures under low pressure to form a half or a whole tube of finite length. In the design of the joined halves of the two corresponding half still have to glue on the subsequent production stage in order to form a solid tube. To obtain the desired tightness on the outer side of the pipe if necessary also coated.

The pipe is subsequently enclosed in thermal insulation of foamed polyimide, polyethylene foam and the like, depending on the respective application and installation.

To reduce weight, which constantly strive in aviation, is required to reduce the thickness of the wall of the pipe, therefore, when laying in cramped conditions and during operation the pipes are bent, resulting in adequate throughput of air is no more.

Disclosure of inventions

The objective of the invention is to create an air duct, which, compared with known air-conditioning forcibly ventilated passenger cabin of an aircraft, has a low weight, and in addition, is designed for high load reinforcement on segments with risk of depression or segments with a high mechanical load, so that, in particular, to avoid, to the extent possible, the destruction in the process of installation and/or operation.

This task is solved by a device having the characteristics of paragraph 1 of the claims.

Due to the fact that the duct is made of foamed plastic and/or a dense plastic, and one outer side of the duct and/or one inner side of the duct has a floor, at least one linear reinforcing element intended for reinforcement, at least in certain sections, the duct according to the invention has a low weight and high reliability against bending, or bending strength at all sections of the duct. In addition, the use of foamed plastic is and to perform air duct makes unnecessary additional covering of duct adequate insulating material to reduce heat loss, as foamed plastic, in addition to the function of the air supply, and performs an insulating function. When using shrink plastic, for example, in the form of a thin plastic film or similar material, appreciable thermal insulating ability, in contrast, is missing. The possibility of variation in some parts of the ability of the reinforcement to mechanical stress through changes in the density of turns of coverage means that the air duct according to the invention can be optimally adapted to different local loading requirements laid along the plot that results in significant weight reduction.

In accordance with the invention, a coating for reinforcement of the duct is formed of several layers, each layer contains a large number of turns wound in the same direction. The floor of the duct adjacent layers provide design coatings with relatively high mechanical strength. In addition, layers, one above the other, contain coils wound in opposite directions with the formation of the mesh cover. As a result, the coating is completely attached to the mesh structure, which ensures good communication between the individual layers wound on the outer side of the duct. The distance between the coils and/is whether the angle between the coils and the longitudinal axis of the duct varies in certain areas with the aim of changing the density of turns depending on the local requirements of the mechanical load of the duct. Due to variation in certain areas of the distances between the coils and/or the angle or the density of turns of the coating ability of the air duct in accordance with the invention to mechanical loads can be adjusted optimally in certain areas under the respective requirements, resulting in significant weight reduction. If, for example, to reduce the distance between the coils, the corresponding duct segment acquires a greater resistance to bending and is, therefore, more resistant to deflection. This alternative implementation may be advantageous, for example, laid on areas requiring small radius of curvature of the duct. Conversely, on straight stretches of underground pipeline can be used weaker reinforcement created by the coverage that can be achieved by increasing the distance between the coils and/or increase the angle of inclination, i.e. in General by reducing the density of turns. As a result, the bending strength of the duct sufficiently reduced, resulting in increased flexibility to compensate for tolerance and facilitates the Assembly of the pipeline. Alternatively, you can completely get rid of reinforcement on straight segments of underground pipeline. Linear reinforcing elements for education the project turns, performed at least one continuous fiber encased in a matrix of thermosetting plastic and/or a matrix of thermoplastic polymer. This provides reinforcement that with a light weight allows it to withstand high mechanical loads and which can easily be performed, at least in certain areas by covering the outside of the duct and/or the inner side of the duct.

In accordance with additional preferred air duct according to the invention in order to minimize losses of the flow inside the duct is essentially smooth. This configuration provides minimum resistance to the flow in the duct.

In accordance with an additional preferred variant, the duct is made of at least one of the folded pieces of foamed plastic and/or a dense plastic. Consequently, due to the use of the material in the form of a panel connector according to the invention can be performed in a simple way and with cost savings. To this end portions of material are material in the form of panels and rolled up or collapsed so as to form a duct. To form a duct, the opposite longitudinal side portions of material are firmly bonded together.

In the accordance with the more preferred option in each case two adjacent to each longitudinal side of the folded portion or portions of the material made with the possibility of connection through the connecting element in order to form the duct. The connecting element, which is preferably made in the form of quick-connects quickly and simply to make the duct by the fastening of the longitudinal sides of the portion of the material in the form of a panel after folding. Introducing the sealing means in the connecting element, can be provided virtually complete sealing of the duct along the so formed longitudinal seam.

In an additional preferred variant provides that for the formation of the duct corresponding to the adjacent longitudinal side of the folded section or sections of the material are performed with the possibility of strong connections, in particular gluing or welding to each other. The result is a more simple design of the air duct, not requiring additional connecting element on the longitudinal sides of the portion of the material.

In accordance with an additional preferred variant, the duct is made of seamless, at least one strip of foamed plastic and/or a dense plastic. This option allows you to make lines of virtually any desired length using known methods, extrusion plastic.

In accordance with additional preferred Varian is Ohm to improve the tightness of the inside of the duct and/or the outer side of the duct contains an additional sealing layer. As a consequence diminish any loss of air associated with leaks in the area of the wall of the duct, so that the whole length of the duct is only a very small pressure loss.

Additional claims described preferred design options.

Brief description of drawings

1 shows a perspective view of the air duct according to the invention in accordance with the first embodiment,it

figure 2 is an enlarged section a of figure 1,

figure 3 shows part of the material for the formation of a duct according to the first variant implementation with possible notch to enable the connection

figure 4 shows a cross-section of part of the material for the formation of a duct in accordance with the first embodiment along the line b-b In Fig 3,

figure 5 shows a connecting element for inclusion in the duct corresponding to the first variant implementation,

figure 6 shows a three-dimensional diagram of the air duct according to the invention in accordance with the first embodiment c of the V-shaped articulation

figure 7 shows the air duct according to the invention in accordance with the second embodiment and restraint.

on Fig depicts an alternative implementation of the headband is for attaching the duct to the secondary structural elements.

In the drawings, identical structural elements are in each case the same reference numbers.

The implementation of the invention

Figure 1 shows a perspective view of the air duct according to the invention, the input air-conditioning forcibly ventilated passenger cabin of an aircraft, in accordance with the first embodiment.

The duct 1 is formed from a collapsed portion of the material 2, the longitudinal sides 4, 5 of which are adjacent to each other in the region of the longitudinal seam 3, are fastened together with ensuring tightness. Part material 2 preferably is a thermoplastic foamed plastic closed-cell foam, such as foamed polyimide, polyethylene foam (PE foam) and the like, the thickness of the part material 2 depends, in particular, from the coefficient of thermal conductivity used foamed plastic and the required thermal insulation capacity and is preferably less than 100 mm, So the thickness of the portion of the material 2 may vary within wide limits and may vary at specific points. In the folding or bending parts material 2 duct 1 has an essentially round, oval or elliptical cross-section.

On the one hand, foamed plastic used for the portion of material 2, allows the returns good thermal insulation ability of the duct 1, on the other hand, foamed plastic allows the supply air in duct 1 and provides in General a sufficient mechanical stability, at least on straight stretches of underground duct 1. The simultaneous presence of the insulating features and functions of the air supply part of the material 2 gives the result when you run an air duct in accordance with the present invention is the saving of material, accompanied by a significant reduction in weight.

If thermal insulating ability of the duct 1 has in a particular embodiment, only of secondary importance, some of the material 2 may be a dense plastic, for example termoplastici resin and/or thermosetting plastic material with sufficient thickness of material. The term "dense" plastic means that unlike foamed plastic voids in the material are essentially absent. The result does not exclude the introduction of reinforcing fibers such as carbon fibers or glass fibers.

To increase the mechanical stability of the duct 1 has a cover 6. In the illustrated example, the variant of implementation, the coating 6 is formed by two continuous fibers 7, 8, acting as linear reinforcing elements, each of which is wound spirally on the outer side 9 is Suharevka in opposite directions. To ensure the sustainability of continuous fibers 7, 8 are implemented or, preferably, enclosed on all sides in a matrix (binder) of thermosetting plastic, such as epoxy resin or phenolic resin. Continuous fiber 7 forms, thus, the layer 10 with a large number of turns of which is to facilitate reading of the drawings the reference number indicated only one coil 11. Continuous fiber 8, respectively, forms a layer 12, the underlying layer 10, with a large number of coils, of which the reference number is marked only one round 13. Placed one on top of the other layers 10, 12 have respective coils with opposite winding directions so that the cover 6 is attached to the General lattice structure with good bonding between layers 10, 12.

Continuous fibers 7, 8 may be formed of ceramic, aramid (Kevlar), and glass or carbon fibers. It is also possible the formation of continuous fibers 7, 8 of the beams of many of these fibers or a mixture of these fibers. Alternatively can be used as continuous fibers 7, 8 of thermoplastic resin and/or thermosetting plastic. To increase the mechanical stability of continuous fibers 7, 8 can be embedded in a matrix of a thermoplastic resin and/or thermosetting plastic material, e.g. the measures epoxy resin or phenolic resin.

On those sections of the duct 1, where there is a risk of bending, i.e, for example, laid segments with a relatively small radius of curvature or with other external mechanical loads, mesh coating 6 formed at least one layer has a higher density of turns". Increasing the density of turns means that the tilt angle of 15, which is determined, for example, between the coil 13 continuous fibers 8 and the longitudinal axis 16 of the duct, and/or the distance 14 between the two coils of one of the continuous fibers 7, 8 is reduced. Conversely, the corresponding distance or angles in the floor 6 at a lower density of orbits increase. The density of turns of the coating 6 may, on some sections vary along the longitudinal axis 16 of the duct, for example, to adjust to the requirements of the local mechanical load. Increase or decrease the density of turns of the coating 6 leads to the fact that changing the "cell size" of a mesh cover 6 formed by two layers 10, 12.

On those stretches of underground duct 1, where there is a risk of bending, the density of turns of the coating 6 may be increased to such an extent that the bend in the duct 1 at all normally encountered mechanical loads is actually ruled out. In this case, the air duct 1 according to the invention is suitable for the t of standard pipe with thick wall. On the other hand, on straight stretches of underground pipeline 1 the density of turns of the cover 6 can be reduced, leading to a significant reduction in weight.

Alternatively, it is also possible to separate the continuous fibers 7, 8 in the beginning laid straight and start again covering newly laid continuous fibers only in the beginning laid the curved segment. You can also cover the duct 1 (in each case in opposite directions) more than the two illustrated by continuous fibers 7, 8 that will allow you to get more layers of continuous fibers arranged one above the other.

The fact that the density of turns of the cover 6 or the size of the cells formed by the mesh cover 6 can be at specific points changed as specified in the depending on locally occurring loads, leads to a possible significant reduction in weight when performing duct 1 according to the present invention. In addition, the flexibility of the duct may be at specific points adapted to local conditions so that the Assembly is considerably simplified.

To reduce the flow resistance in the duct 1, its inner side 17 is preferably smooth. On parts of material 2 formed of thermoplastic polymer clay is AMI, smoothing the inner side 17 of the duct can be performed, for example, by using what is called "curing", i.e. heat treatment. Alternatively, the inner side 17 of the duct can be fitted or covered with a sealing layer, in particular a layer of paint or tar.

Unlike shows a variant implementation of figure 1, the duct 1 may contain an internal coating (not shown), made in accordance with the coating 6 and situated on the inner side 17 of the duct. This internal coating, at least in certain sections, may be provided instead of the cover 6, or in addition to it. The inner coating prevents deflection of the air duct 1, for example, in the case when the atmospheric pressure in the air duct 1 is higher than the pressure inside the duct 1. If the pressure inside the duct 1 is higher than the ambient pressure in any working condition in a particular application, in General, to neutralize the forces required only the outer coating 6.

The air duct according to the invention serves to supply air in the temperature range from -55C to +85C. the Application of the air duct 1 is limited to cases in which the load due to differential pressure relative to the pressure in the cabin is not b is over 500 hPa. This means that the differential between the pressure in the duct and the pressure outside the duct 1 is not more than 500 hPa in all possible operating conditions. During normal operation, the pressure in the duct 1 is generally higher than outside air, so that there is a positive differential pressure. In certain dynamic operating conditions the pressure in the duct 1 may be lower than the pressure outside the duct 1, so that there is a negative pressure differential. Negative pressure differences of this kind can also occur in the duct 1 when it is used for suction filtered stale air etc.

To provide the inner side 17 of the duct internal coating of the type described, the inner coating is first created on the element winding, such as the core or similar element. Inner cover element winding is formed in the same manner as described above floor 6 on the outer side 9 of the duct, and has a corresponding design with the identical structure. Then the piece of material 2 is placed around the core with internal coating and is connected along the longitudinal sides 4, 5. After that, the core can be removed. In accordance with the foregoing, when needed, on the outer side 9 vazduhoplov is Yes, formed from part of the material 2, is applied to the outer coating 6. The core may also remain inside the duct 1 as long until you finish the outer coating 6.

Figure 2 shows the section a of figure 1 in an enlarged view.

Part of the material 2 has two longitudinal sides 4, 5. To connect the longitudinal sides 4, 5 that are adjacent to each other, side surfaces in the region of the longitudinal seam 3, in the longitudinal sides 4, 5 and runs a large number siteplease of grooves and ridges to form a linear connecting element 18 in the form of a quick coupling. The connecting element 18 in this case is preferably reusable separation.

After the actual manufacturing process of the part material 2, for example, by rolling or other similar way, it can be done grooves and ridges. Alternatively, a flat section of material 2 can be manufactured by known methods for the extrusion of plastic with joint forming grooves and ridges in the same way by proper configuration of the geometry of the nozzle (outlet).

Instead of connecting the longitudinal sides 4, 5 (shown as example in figure 2) through having a trapezoidal shape of grooves or ridges that can at measures which in certain places to be entered into each other with mutual coupling, can be used and other modifications, quick connections, such as connection under pressure, by means of hooks and loops, etc. to increase the tightness of the duct 1, it may also be necessary to provide the connecting element 18 additional sealing means, for example, by staining the plastic.

In contrast to the depicted configuration, the coupling element 18 in the form of a releasable quick coupling, longitudinal sides 4, 5 can also be durable, i.e. without the possibility of separation under normal operating conditions, knit together by means of adhesive or welded connection.

Thus the outer side 9 and the inner side 17 of the duct form an essentially continuous smooth surface in the region of the longitudinal seam 3, and mutually overlapping areas of overlap are located on the longitudinal sides 4, 5.

Figure 3 shows part of the material in the flat, i.e. in resveratol, the position for forming the air duct in accordance with the first embodiment.

Flat or panel of the material 19 used to form the duct 1 according to the invention has an essentially circular recess 20 to education, in particular, the T-shaped connection. In accordance with the image in figure 1 and 2 piece mother of the La 19 is made of foamed plastic. Part of the material 19 is folded or twisted in accordance with the image in figure 1 and 2 and, as outlined in the description of figure 2, connects the longitudinal sides 21, 22, forming the duct 1 through the connecting element 18 in the form of a quick coupling.

The grooves and ridges (cf. figure 2) for fastening the longitudinal sides 21, 22 to form the air duct 1 is shown as parallel lines without reference numbers to facilitate reading of the drawings.

Figure 4 shows the cross-section of part of the material along the line b-b In figure 3.

To form the connection part material 19 made of the recess 20. The longitudinal sides 21, 22 contain grooves and ridges (not shown) for fastening the longitudinal sides 21, 22 in order to form a duct through the folding section of the material 19, the longitudinal sides of which are made in accordance with the image in figure 1 and 2.

In the recess 20 by, for example, stepped drill or similar tool are countersunk socket 23 and the fixing hole 24. Section 25 with internal thread runs in a part of the material 19 in the area of the countersunk socket 23 and is used for fastening the connecting element (not shown in figure 4) in terms of material 19.

Figure 5 shows a connecting element for forming a T-shaped connection of vazduhoplovu is but the present invention.

The connecting element 26 is basically formed by a tubular element 27 with a circular flange 28 located at one end of the tubular element 27. Preferably, the flange 28 can be inserted in countersunk socket 23 is flush. The tubular element 27 having a cross-sectional view of the essentially hollow cylinder also contains a section 29 with an external thread. Section 29 with an external thread designed to match the site 25 with the internal thread portion of the material 19 to section 29 with the outer thread of the connecting element 26 could be introduced to ensure mutual coupling, at least in certain places, with a plot of 25 with internal thread and a fixing hole 24 in the portion of the material 19 by simply screwing in a piece of material 19 and, thus, could be secured in it (cf. figure 4). In this case, the connecting element 26 is performed in such a way that the T-shaped joint is formed by screwing.

To increase the tightness and mechanical strength is formed in such a way that the T-shaped connection, it may be necessary to provide sealing means or adhesive, at least in a few places section 29 with an external thread and/or section 25 with internal thread.

6 shows the V-shaped connection element 30, the cat is which branches off from the duct 31. In this case, the connecting element 30 used for the formation of V-shaped connection, again located in the recess 32 in the duct 31 and there is fixed (cf. with figure 4 and 5). Unlike the notches 20 in figure 3, the recess 32 for forming the V-shaped connection has an elliptical geometry, therefore, the screwing of the connecting element 30 is no longer possible. Instead, the connecting element 30 must be pressed, glued, welded or otherwise fastened in the recess 32. The longitudinal sides 21, 22 of the part material 19, as before, are adjacent to each other in the region of the longitudinal seam 33, forming the duct 31.

Instead of using pieces of material 2, 19 in the form of panel executed with use of foamed plastic as the starting material, the air ducts 1, 31 can also be made seamless with the use of known methods of extrusion, and in fact to any desired length.

7 shows a second variant implementation of the duct 34 according to the invention.

In contrast to the first variant implementation, the duct 34 is not made of foamed plastic material with sufficient thickness of material, and some material 35 made of thick plastic, in particular of thin plastic film or similar material. Plastic film can in this case be made of thermoplastic m the material, which as an option can have extra reinforcement fibers.

For mechanical reinforcement of the duct 34 on the outer side 36 of the duct, as before, provided the floor 37. The cover 37 is formed in accordance with the fact, as shown in figure 2, the two continuous fibers 38, 39, role playing essentially linear reinforcing elements. Here continuous fibers 38, 39 is wound on the outer surface 36 of the duct 34 in opposite directions. In addition, the coating 37 has the same structure and the same structure as the floor 6 to 1, so here is a link to part of the description relating to figure 1.

Reinforcement of the duct 34 coating 37 is required in this embodiment, always, since the duct 34 is formed only part of the material 35 from a relatively thin plastic film by folding part of the material 35. Accordingly, the longitudinal side portion of the material 35 to be used for forming the duct 34 may be bonded together by having the trapezoidal shape of grooves and ridges, as illustrated in figure 2 and 4. In this second embodiment, the duct 34 is sure to both longitudinal side portions of material 35 were firmly bonded together, for example, by gluing or welding.

the air Duct 34 also includes two end reinforcing zone, preferably executed in the same manner from a continuous fibers 38, 39 and is depicted in Fig.7. the thick lines. These reinforcing zone can be used, for example, in order to attach the coupling elements, etc. As a rule, the coating 37 can only be performed after appropriate pre-treatment of the outer side 36 of the duct. This is especially important if continuous fibers 38, 39 is covered with a curable thermosetting plastic, such as epoxy resin or phenolic resin forming the matrix, and part of the material 35 is a thermoplastic polymer. In the second embodiment, the duct 34 of the material 35 may represent, for example, plastic film of polyetherimide (PAYS), Tedlar (polyvinylfluoride, PVF), pipelinedelivered (PVDF), etc.

The duct 34 also includes a holder 40 for attachment to additional structural elements (not shown), such as reinforcing profiles of the elements of the fuselage of an aircraft or other similar items. The holder 40 has a base plate 41, which is for fastening covered by continuous fibers 38, 39. To join additional structural elements of the base plate 41 has a mounting bracket 42 with the mounting hole 43 located essentially at right elevation is to the base plate. The density of turns of the cover 37 in the area of the holder 40 is preferably increased.

The second variant implementation of the duct 34 may additionally or alternatively contain, at least in certain sections of the internal coating for reinforcement, as it was explained in the description of figure 1.

Fig shows an alternative implementation of a holder for attaching the duct to the structural elements.

The holder 44 in the first contains the base plate 45. The base plate 45 is curved, and the curvature of the base plate 45 preferably matches the curvature of the surface of the duct on which to fasten the holder 44 by coating continuous fibers. The rod 46 with multiple locking tabs, 47-50 is located on the base plate 45. The retaining clips 47-50 can completely or partially be entered with snap-in connecting means 51, as shown by the arrow 52. The connecting means 51, which can incrementally to snap into place on the rod 46, is used, in particular, in order to attach the holder 44 and, thereby, attach the duct to the secondary structural elements (not shown). For fixing the mounting position desired position of the holder can be fixed on a permanent basis by means of the PTO adhesive or by mechanical means, for example, using a locking pin or other similar manner.

Thanks, at least four to latch rod 46 on the connecting means 51, the connecting means 51 can be adjusted in the direction of the arrow 53 in such a way that during the Assembly process, there is a possibility of compensation of tolerance in this spatial direction.

In addition, the rod 46 on the base plate 45 may also be accommodated in the groove 54 with the possibility of continuous displacement and, at the same time, can be locked in the direction of the arrow 55, so that in this direction there is the possibility of compensation of tolerance. The possibility of compensation of tolerances in the direction of the arrows 53, 55 greatly simplifies the installation of the duct on additional structural elements (not shown) in the aircraft.

1. The duct for air conditioning of an aircraft made with the possibility of air flow, in particular in the temperature range from -55C to +85C and under load due to the pressure difference relative to the pressure in the cabin of an aircraft, does not exceed 500 hPa, and the outer side of the duct or inner duct provided with a coating for reinforcement of the duct containing a number of layers, each of which has a number of coils formed of at least one n is discontinuous fiber, if this turns layers located one above the other, wound in opposite directions with the formation of the mesh structure of the coating, characterized in that it is made of foamed plastic or thick plastic, and the continuous fiber forming coils arranged one above the other layers are enclosed in a matrix of thermosetting plastic or a matrix of thermoplastic polymer, and the distance between the coils or the angle between these coils and the longitudinal axis of the duct varies along the longitudinal axis of the duct to change the density of the coils along the longitudinal axis of the duct depending on the local requirements of the mechanical load of the duct.

2. The air duct according to claim 1, characterized in that the inner side of the duct is made essentially smooth to minimize losses of the stream.

3. The air duct according to claim 1, characterized in that the at least one folded portion of the material which is foamed plastic and/or dense plastic.

4. The air duct according to claim 3, characterized in that in each case two adjacent to each longitudinal side of the folded portion or portions of the material made with the possibility of connection via a connecting element for the formation of a duct.

5. The air duct at p., characterized in that for the formation of the duct corresponding to the adjacent longitudinal side of the folded portion or portions of the material made with the possibility of lasting connection, in particular gluing or welding to each other.

6. The air duct according to claim 1, characterized in that the seamless, at least one strip of foamed plastic and/or dense plastic.

7. The air duct according to any one of claims 1 to 6, characterized in that the inner side of the duct and/or the outer side of the duct contains an additional sealing layer to improve the tightness.

8. The air duct according to claim 6, characterized in that the part or parts of the material and the strip or strips of material designed for education of the duct, and represents a foamed plastic, have a thickness depending on a predefined coefficient.

9. The air duct according to claim 6, characterized in that the part or parts of the material and the strip or strips of material designed for education of the duct and which is a thick plastic, have a thickness of less than 0,5 mm

10. The air duct according to any one of claims 1 to 6, characterized in that the foamed plastic is a thermosetting plastic and/or thermoplastic polymer, in particular foamed polyimide or vspe the military polyethylene.

11. The air duct according to any one of claims 1 to 6, characterized in that the thick plastic is a thermosetting plastic and/or thermoplastic polymer, in particular a film of polyvinylidene fluoride or other heat-resistant materials.

12. The air duct according to any one of claims 1 to 6, characterized in that the thick plastic reinforced with fibers.



 

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2 dwg

FIELD: mechanics.

SUBSTANCE: pipe incorporates load-bearing composite-material carcass and tip with circular stepwise flanges representing cylindrical ledges with radial circular grooves. The first layer of the aforesaid load-bearing carcass features the thickness equal to that of the first flange, while every following layer is a combined one with alternating lengthwise or a spiral and circular layers wherein the end of every lengthwise or spiral layer is laid into the radial groove and is secured by an additional circular layer with the thickness equal to the groove depth. The propose method of pipe production consisting in a layer-by-layer laying on to the mandrel of the reinforcing layers, wherein every lengthwise or spiral combined layer is laid so that the fibers extend the reinforcing carcass edges and are secured in the tip outer edges, comprises coiling an additional circular along with deforming the previous layer and cutting off excess fibers coiling the final layer with subsequent thermal treatment and withdrawal from the mandrel. The proposed invention allows obtaining rectilinear fibers and their minimum possible deformation in all bearing layers, layer-by-layer coupling and independent layer securing on the tips.

EFFECT: smaller pipe sizes, reduced wall thickness and higher strength and reliability.

7 cl, 12 dwg

FIELD: aeronautical engineering; air-conditioning systems for flying vehicles equipped with double-flow turbo-jet engines.

SUBSTANCE: proposed air-conditioning system includes heat exchanger whose hot line is connected with engine compressor by means of air-bleed line and is communicated with flying vehicle cabin and purging line is connected with engine fan circuit by means of air duct and is communicated with atmosphere. Flap with inlet wing (11) and outlet wing (12) is mounted in air duct by means of hinge (10) and is connected with flow and temperature regulator. Air flow stabilizing unit is made in form of divider (13) mounted in between air-to-air heat exchanger and flap of flow and temperature regulator in segment of air duct section behind outlet wing (12); front surface (15) is equidistant relative to profile of edge of outlet wing (12) in all positions of flap.

EFFECT: increased service life of all components of air-conditioning system.

4 dwg

The invention relates to aircraft, primarily to air conditioning systems for aircraft gas turbine engines

The invention relates to refrigeration, and in particular to air turbopropeller installations

FIELD: aeronautical engineering; air-conditioning systems for flying vehicles equipped with double-flow turbo-jet engines.

SUBSTANCE: proposed air-conditioning system includes heat exchanger whose hot line is connected with engine compressor by means of air-bleed line and is communicated with flying vehicle cabin and purging line is connected with engine fan circuit by means of air duct and is communicated with atmosphere. Flap with inlet wing (11) and outlet wing (12) is mounted in air duct by means of hinge (10) and is connected with flow and temperature regulator. Air flow stabilizing unit is made in form of divider (13) mounted in between air-to-air heat exchanger and flap of flow and temperature regulator in segment of air duct section behind outlet wing (12); front surface (15) is equidistant relative to profile of edge of outlet wing (12) in all positions of flap.

EFFECT: increased service life of all components of air-conditioning system.

4 dwg

FIELD: aircraft engineering.

SUBSTANCE: proposed air duct can feed air in the temperature range of minus 55C to plus 85C and at load with pressure difference relative to aircraft cabin inside pressure not exceeding 500 GPa. Air duct outer or inner side is furnished with multi-layer reinforcing coat. Every layer has a number of coils formed by at least one continuous fiber. Coils of layers arranged one above another are wound in opposite directions to form the coat cellular structure. Air duct is made from foamed or dense plastic material. Aforesaid continuous fibers are enclosed by matrix made from either thermosetting plastic or thermoplastic polymer. Distance between said coils or angle of inclination between them and air duct lengthwise axis varies along said axis to change coils density along air duct lengthwise axis depending upon local requirements to air duct mechanical strain.

EFFECT: air duct reduced weight and increased strength.

12 cl, 8 dwg

FIELD: transport.

SUBSTANCE: invention relates to method and system to control pressure in aircraft cabin. Proposed method and system to control pressure in aircraft cabin comprise determining the state of at least one aircraft door with the help of at least one indicator. Door state signal is sent to regulation unit incorporates with aircraft radio electronic hardware ventilation system. Aircraft radio electronic hardware ventilation system is controlled in response to door state signal so that in case door state signal indicates incomplete or unlocked door closure state, pressure increase in aircraft cabin is eliminated.

EFFECT: reliable prevention of excess pressure in aircraft cabin.

12 cl, 2 dwg

FIELD: transport.

SUBSTANCE: invention relates to aircraft engineering. Proposed system comprises first system of lines, evaporator, second system of lines and adjustable diaphragm device arranged in second system of lines to reduce steam flow pressure. First system of lines comprises air feed distribution system communicated with every aircraft cab compartment that incorporates separate air conditioning system. Second system of lines comprises multiple steam flow distribution lines each communicated with one of aforesaid air feed distribution lines and supplied from common steam flow manifold line that transfer generated steam flow from aforesaid evaporator. Diaphragm device comprises one adjustable orifice in each steam flow distribution lines.

EFFECT: higher efficiency of humidification of aircraft cab.

4 cl, 1 dwg

FIELD: transport.

SUBSTANCE: invention relates to machine building, particularly to air conditioning systems. Proposed system comprises compressor to increase pressure airflow bled from outside air ram flow channel and, via heat exchangers, is forced into aircraft sealed zones. Each zone with different air temperatures is provided with separate zone heat exchanger for each said zone to receive extra air in compliance with temperature to be maintained in said zone. Zone heat exchangers are mounted in ram airflow channel to cool down air for separate zones to required temperature.

EFFECT: higher efficiency of airflow cooling.

5 cl, 3 dwg

FIELD: transport.

SUBSTANCE: inventions relate to the field of transport machine building, specifically to Modular cooling systems and refrigerators for this system. Modular refrigerating system for aircraft contains multiple refrigerators for producing and transmitting cold to cooling medium and cooling medium loop. The loop includes multiple cold consumers and is intended to provide cold for cold consumers. Each refrigerator is connected to the loop and is made in the form of modular unit. The modular unit has one pump to transmit cooling medium via the loop. Number of modular refrigerators is selected from condition of conformity with system needs in cold. In this system, refrigerators are connected to the loop in parallel. The modular refrigerator for aircraft cooling system contains refrigerating facility and device for transmitting produced cold to cooling medium. The device for transmitting produced cold contains one heat exchanger and pump for transmitting cooling medium through the heat exchanger. The refrigerator is made capable to be connected to refrigerating system loop which includes multiple cold consumers. The pump together with refrigerating facility forms modular unit as modular refrigerator to provide cooling system loop with cold. Modular refrigerator is made capable to meet system needs in cold under condition when multiple such modular refrigerators are connected to the loop in parallel.

EFFECT: higher flexibility of refrigerating system.

17 cl, 3 dwg

FIELD: transport.

SUBSTANCE: invention relates to aircraft cooling air supply and to aircraft. Proposed system comprises air inlet, air channel communicated with the latter, and air distribution device to distribute air between at least two devices via cooling air feed line. Air inlet sizes are selected to ensure satisfying maximum demand in cooling air for at least two devices. Cooling air feed line incorporates adjustable throttling device coupled with cooled device to allow distribution of cooling air in amount sufficient for normal operation. Aircraft comprise cooling air feed system to supply cooling air to at least two aircraft cooled devices.

EFFECT: higher efficiency of cooling.

17 cl, 1 dwg

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