Deflation valve and preparation method

Abstract

The invention provides a deflation valve and a preparation method. The deflation valve comprises a supporting piece with a bolt hole, a first thin plate located at the bottom of the supporting piece, a plurality of vertical plates located at the top of the supporting piece, two side plates located on the two sides of the vertical plates and second thin plates located at the tops of the side plates and the tops of the vertical plates. The vertical plates and the side plates are arranged at intervals to form a deflation flow channel, and the supporting piece with the bolt hole is rotationally connected with a driving mechanism; wherein at least one of the first thin plate, the vertical plate, the side plate and the second thin plate is made of a resin-based composite material. According to the air bleed valve, the resin-based composite material is adopted as one of the materials for manufacturing the air bleed valve, compared with a traditional aluminum alloy material, the weight of the air bleed valve can be greatly reduced, and due to the fact that a plurality of air bleed valves are generally assembled in the circumferential direction of the intermediate inner case, the whole intermediate inner case is beneficial to reducing the weight of the intermediate inner case.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to an air release valve and a preparation method thereof. Background Art

[0002] At present, in the field of aviation engines, when a turbine engine is running, air is sucked in through the high-speed rotation of the low-pressure compressor blades, and then enters the high-pressure compressor for compression. When the aircraft takes off and lands, the engine is in a transitional working state - when it accelerates or decelerates rapidly, the air flow provided by the low-pressure compressor is greater than the air flow that the high-pressure compressor can handle in the current state.

[0003] If the high-pressure compressor stores a large amount of gas expansion energy that cannot be released, it is very easy to cause the engine to surge, affecting its safety and reliability. Therefore, the turbine engine is designed with a variable bleed valve (VBV) between the low-pressure compressor and the high-pressure compressor. It is installed on the inner side of the outer edge of the intermediate inner casing. When the engine is in the transition working state at medium and low speed, the bleed valve is fully opened to drain the excess air flow input by the low-pressure compressor. When the engine is in the cruising working state at a high speed, the bleed valve is fully closed to match the working state of the high-pressure compressor.

[0004] At present, the bleed valve is mainly made of metal materials and is manufactured by machining of castings or forgings. Since the bleed valve is a thin-walled, multi-cavity complex structure, castings are prone to casting defects such as looseness, and the casting quality is difficult to control, and the yield is low; on the other hand, the existence of multiple thin walls makes it difficult to implement mechanical processing of forgings. Not only is the process difficult to ensure the accuracy of large surfaces, but the processing volume is large, the material utilization rate is low, the material cost and manufacturing cost are high, and it is not economical.

[0005] Based on this, the inventor of the present application proposes a vent valve and a preparation method thereof in order to solve the above technical problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of poor processing precision and low yield of the bleed valve in the prior art, and to provide a bleed valve and a preparation method thereof.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] The present invention provides a deflation valve, which is characterized by a support member with a bolt hole, a first thin plate located at the bottom of the support member, a plurality of vertical plates located at the top of the support member, two side plates located at both sides of the plurality of vertical plates, and a second thin plate located at the top of the side plates and the vertical plates;

[0009] A plurality of the vertical plates and the side plates are spaced apart to form a discharge air passage, and the support member with bolt holes is rotatably connected to the driving mechanism; wherein,

[0010] At least one of the first thin plate, the vertical plate, the side plate and the second thin plate is made of a resin-based composite material.

[0011] According to an embodiment of the present invention, the support member is a metal support member.

[0012] According to an embodiment of the present invention, the first thin plate, the vertical plate, the side plate and the second thin plate are all made of resin-based composite materials.

[0013] According to one embodiment of the present invention, the support member is formed by gluing the first thin plate and the plurality of vertical plates;

[0014] The plurality of vertical panels and the side panels are bonded and formed;

[0015] The side plate is bonded to the first thin plate and the second thin plate.

[0016] The present invention also provides a method for preparing a vent valve, which is characterized in that the method is used to prepare the vent valve as described above, and comprises:

[0017] Using metal parts to process and shape the support parts;

[0018] Adhesively bonding the first thin plate and the support member to form a first assembly;

[0019] Bonding a plurality of vertical panels to the first assembly to form a second assembly;

[0020] The second assembly is glued together with the side plate and the second thin plate to form a deflation valve.

[0021] According to an embodiment of the present invention, the first thin plate, the vertical plate and the second thin plate are made of reinforced carbon fiber and resin matrix epoxy resin.

[0022] According to one embodiment of the present invention, the first assembly, the second assembly and the deflation valve are all formed by bonding in an autoclave.

[0023] According to one embodiment of the present invention, the reinforcing carbon fiber is T800 grade carbon fiber, and the resin matrix epoxy resin is a high-temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 40%, and the molding temperature of the first assembly, the second assembly and the vent valve is 180°C±5°C, the time is 120min, and the pressure is 0.6MPa.

[0024] According to one embodiment of the present invention, the reinforcing carbon fiber is T700 grade carbon fiber, and the resin matrix epoxy resin is a high-temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 38%, and the molding time of the first assembly, the second assembly and the deflation valve is 180 minutes, and the pressure is 0.3MPa.

[0025] According to one embodiment of the present invention, the reinforcing carbon fiber is T300 grade carbon fiber, and the resin matrix epoxy resin is a high-temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 33%, and the molding time of the first assembly, the second assembly and the deflation valve is 90 minutes, and the pressure is 0.3MPa.

[0026] According to one embodiment of the present invention, the resin matrix epoxy resin is a medium-temperature curing epoxy resin; wherein the molding temperature of the first assembly, the second assembly and the vent valve is 120°C±5°C and the pressure is 0.5MPa.

[0027] According to one embodiment of the present invention, the reinforcing carbon fiber is T700 grade carbon fiber; wherein the resin matrix epoxy resin accounts for 38%, the molding time of the first assembly, the second assembly and the deflation valve is 180 minutes, and the pressure is 0.3 MPa.

[0028] According to one embodiment of the present invention, the reinforcing carbon fiber is T300 grade carbon fiber; wherein the resin matrix epoxy resin accounts for 33%, the molding time of the first assembly, the second assembly and the deflation valve is 90 minutes, and the pressure is 0.6Mpa.

[0029] The positive and progressive effects of the present invention are:

[0030] The bleed valve of the present invention uses a resin-based composite material as one of the materials for making the bleed valve. Compared with traditional aluminum alloy materials, the weight of the bleed valve can be greatly reduced. Since a plurality of bleed valves are generally installed circumferentially of the intermediate inner casing, the entire intermediate inner casing helps to reduce its weight.

[0031] The molding method of the composite material is autoclave bonding molding. The composite material curing and the assembly bonding can be formed simultaneously. Compared with the casting machining in the prior art, it avoids the problems of easy defects in castings and low production qualification rate. At the same time, the composite material molding process does not require the use of mechanical processing procedures to generate excessive material surplus, which effectively improves production efficiency and material utilization and reduces production costs.

[0032] Using composite materials to form the bleed valve is beneficial to improving the wear resistance and weather resistance of the bleed valve, and the bleed valve has good assembly characteristics and durability.

[0033] When the inner casing undergoes micro-movement or vibration, the bleed valve formed of composite materials can consume some of the stress and act as a buffer, reducing the risk of mutual wear between metal parts.

[0034] The vent valve formed of composite materials is easy to repair and replace. When the adhesive joint is damaged, it can be repaired by in-situ glue repair, or it can be replaced as a whole according to the usage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0036] Figure 1 It is a schematic diagram of the installation of an exemplary deflation valve of the present invention;

[0037] Figure 2 It is a schematic structural diagram of an exemplary air release valve of the present invention;

[0038] Figure 3 The figure is a flow chart of assembling an exemplary bleed valve of the present invention;

[0039] Figure 4 The figure is a flow chart of an exemplary method for preparing a bleed valve according to the present invention.

[0040] 1. Support member; 2. First thin plate; 3. Vertical plate; 4. Side plate; 5. Second thin plate; 6. Vent flow channel; 7. Intermediate inner casing; 8. Vent valve. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term.

[0043] Please refer to Figure 1 to Figure 2The present invention provides a deflation valve 8, comprising a support member 1 with a bolt hole, a first thin plate 2 located at the bottom of the support member 1, a plurality of vertical plates 3 located at the top of the support member 1, two side plates 4 located on both sides of the plurality of vertical plates 3, and a second thin plate 5 located at the top of the side plates 4 and the vertical plates 3.

[0044] A plurality of vertical plates 3 and side plates 4 are spaced apart to form a degassing channel 6, and a support member 1 with bolt holes is rotatably connected to a driving mechanism; wherein, at least one of the first thin plate 2, the vertical plate 3, the side plate 4 and the second thin plate 5 is made of a resin-based composite material.

[0045] The bleed valve 8 installed on the inner side of the outer edge of the intermediate inner casing 7 of the aircraft engine can be adjusted from fully open to fully closed by a driving mechanism. When the bleed valve 8 is opened, the excess air input by the low-pressure compressor can be guided to the outer duct. When the bleed valve 8 is closed, it can match the working state of the high-pressure compressor.

[0046] The traditional processing method for the bleed valve 8 is to manufacture it by machining castings or forgings. The bleed valve 8 is a thin-walled, multi-cavity complex structure. The casting is prone to casting defects such as looseness, the casting quality is not controlled, and the yield is low. Too many thin walls make it difficult to implement mechanical processing of forgings, the accuracy is difficult to control, and the material utilization rate is low.

[0047] Therefore, the inventors thought of disassembling the deflation valve 8 to improve its own rigidity and the coordination stability with the driving mechanism. Therefore, the support member 1 with bolt holes is made of a metal material with high structural strength, such as aluminum alloy, etc., which is not limited here.

[0048] As for other parts, one or more of the first thin plate 2, the plurality of vertical plates 3, the two side plates 4 and the second thin plate 5 can be made of resin-based composite materials.

[0049] Such a configuration not only satisfies the coordination stability with the driving mechanism, but also reduces the overall mass of the bleed valve 8, which is beneficial to the weight reduction of the intermediate inner casing 7. The first thin plate 2, the plurality of vertical plates 3, the two side plates 4, the second thin plate 5 and the support member 1 are bonded to each other, which avoids the problem of defects in castings and production qualification rate compared to casting and machining. At the same time, there is no need to use a machining procedure to generate excessive material surplus, which effectively improves the production efficiency and material utilization rate of the bleed valve 8 and reduces the production cost of the bleed valve 8.

[0050] The adhesive bonding process specifically uses a structural adhesive film as a connecting medium to connect the support member 1, the first thin plate 2, the vertical plate 3, the side plate 4 and the second thin plate 5. For example, when the support member 1 is connected to the first thin plate 2, a layer of structural adhesive film is disposed between the first thin plate 2 and the support member 1, and then the assembly of the first thin plate 2 and the support member 1 is placed in an autoclave for adhesive bonding.

[0051] In one embodiment, the support member 1 is a metal support member 1 , and the first thin plate 2 , the vertical plate 3 , the side plate 4 and the second thin plate 5 are all made of a resin-based composite material.

[0052] The molding method of the composite material deflation valve 8 adopts net size molding, and the molding precision is high. Because the first thin plate 2, the vertical plate 3, the side plate 4 and the second thin plate 5 can be directly processed and molded into the final shape, when they are assembled with each other, the overall precision of the deflation valve 8 after assembly and bonding is very high, and no material surplus is generated, which is conducive to improving the yield and material utilization rate, and reducing the production cost.

[0053] The composite material itself has wear resistance and weather resistance, giving the deflation valve 8 good assembly characteristics and durability. When the intermediate inner casing 7 is slightly moved or vibrated, the deflation valve 8 made of the composite material can consume part of the stress and play a buffering role, reducing the risk of mutual wear between metal parts.

[0054] Moreover, the deflation valve 8 formed by the composite material is easy to repair and replace. When the deflation valve 8 is damaged by adhesive bonding, it can be repaired by in-situ glue filling, or it can be replaced as a whole according to actual use conditions, thereby further improving the service life of the deflation valve 8.

[0055] Please refer to Figure 3 and Figure 4 The present invention also provides a method for preparing a vent valve, which is used to prepare the above-mentioned vent valve, and the method comprises:

[0056] S110, using metal parts to process and form a support member.

[0057] Because the support member is used for rotational cooperation with the driving mechanism, in order to improve the rotational stability between the support member and the driving mechanism, the support member is made of metal.

[0058] The metal piece is preferably made of aluminum alloy, which not only ensures its structural strength but also has a relatively low weight. The width of the support body is 10 mm-15 mm, preferably 13 mm.

[0059] S120, bonding the first thin plate and the support member to form a first assembly.

[0060] The first thin plate is of uniform thickness, with a thickness of 2 mm-4 mm, preferably 3 mm.

[0061] In one embodiment, the support member includes two support units, a first thin plate is formed by plying, and then the support unit is placed at the target position of the plying, a structural adhesive film is placed between the first thin plate and the support unit, and it is pre-fixed by an external positioning structure to form a first assembly preform, and the first assembly preform is placed in an autoclave for processing and molding, the molding temperature is 180°C±5°C, the time is 120min, and the pressure is 0.6Mpa. After the autoclave processing and molding, the support member and the first thin plate are combined to form a first assembly.

[0062] S130, bonding the plurality of vertical panels to the first assembly to form a second assembly.

[0063] Prepreg is laid along a circumferential circle on multiple rectangular molds to obtain multiple plies, and the multiple plies are arranged in sequence to form multiple vertical plate prefabricated assemblies. After the vertical plate prefabricated assemblies are assembled with the first assembly, a structural adhesive film is laid between the assembly interface of the vertical plate prefabricated assembly and the first assembly, and then it is pre-fixed by an external positioning structure to form a second assembly preform, and then the second assembly preform is placed in an autoclave for processing and molding. The autoclave bonding molding includes the molding of multiple vertical plates and the molding of the vertical plates and the first assembly. The molding temperature is 180℃±5℃, the time is 120min, and the pressure is 0.6MPa.

[0064] Among them, the thickness of the vertical plate is 3mm-5mm, and 4mm is optional.

[0065] S140, bonding the second assembly, the side plate and the second thin plate to form a deflation valve.

[0066] Lay part of the ply on the second assembly to form a prefabricated second thin plate, lay part of the ply on both sides of the vertical plate of the second assembly to form a prefabricated side panel, lay the structural adhesive film on the prefabricated side panel, the second thin plate of the prefabricated body and the combined interface of the second assembly, and then use the external positioning structure to fix it to form a vent valve prefabricated body, and then place the vent valve prefabricated body in an autoclave for processing and molding. The molding temperature is 180℃±5℃, the time is 120min, and the pressure is 0.6MPa, and finally the vent valve part is obtained.

[0067] Among them, the thickness of the side panel is 14mm, which is thicker than the vertical panel, in order to ensure the overall structural strength of the deflation valve.

[0068] Specifically, the first thin plate, the vertical plate and the second thin plate are made of reinforced carbon fiber and resin matrix epoxy resin, and the first assembly, the second assembly and the deflation valve are all formed by bonding in an autoclave.

[0069] In one embodiment, the reinforcing carbon fiber is T800 grade carbon fiber, and the resin matrix epoxy resin is a high-temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 40%, and the molding temperature of the first assembly, the second assembly and the vent valve is 180°C ± 5°C, the time is 120 minutes, and the pressure is 0.6MPa.

[0070] In another embodiment, the reinforcing carbon fiber is T700 grade carbon fiber, and the resin matrix epoxy resin is a high temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 38%, and the molding time of the first assembly, the second assembly and the vent valve is 180 minutes, and the pressure is 0.3MPa.

[0071] In another embodiment, the reinforcing carbon fiber is T300 grade carbon fiber, and the resin matrix epoxy resin is a high-temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 33%, and the molding time of the first assembly, the second assembly and the vent valve is 90 minutes, and the pressure is 0.3MPa.

[0072] In yet another embodiment, the resin matrix epoxy resin is a medium temperature curing epoxy resin; wherein the molding temperature of the first assembly, the second assembly and the deflation valve is 120° C.±5° C. and the pressure is 0.5 MPa.

[0073] Furthermore, when the reinforcing carbon fiber is T700 grade carbon fiber, wherein the proportion of the resin matrix epoxy resin is 38%, the molding time of the first assembly, the second assembly and the deflation valve is 180 minutes, and the pressure is 0.3 MPa.

[0074] Furthermore, when the reinforcing carbon fiber is T300 grade carbon fiber, wherein the proportion of the resin matrix epoxy resin is 33%, the molding time of the first assembly, the second assembly and the deflation valve is 90 minutes, and the pressure is 0.6 MPa.

[0075] That is, medium-temperature curing epoxy resin or high-temperature curing epoxy resin can be selected as needed. The molding temperature and time of epoxy resin with different proportions need to be adjusted accordingly, and the choice can be made based on actual cost and efficiency.

[0076] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0077] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A deflation valve, characterized in that: include: A support member with bolt holes, a first thin plate located at the bottom of the support member, a plurality of vertical plates located at the top of the support member, two side plates located at both sides of the plurality of vertical plates, and a second thin plate located at the top of the side plates and the vertical plates; A plurality of the vertical plates and the side plates are spaced apart to form a discharge air passage, and the support member with bolt holes is rotatably connected to the driving mechanism; wherein, At least one of the first thin plate, the vertical plate, the side plate and the second thin plate is made of a resin-based composite material.

2. The vent valve according to claim 1, characterized in that: The support member is a metal support member.

3. The vent valve according to claim 1, characterized in that: The first thin plate, the vertical plate, the side plate and the second thin plate are all made of resin-based composite materials.

4. The vent valve according to claim 1, characterized in that: The support member is bonded with the first thin plate and the plurality of vertical plates; The plurality of vertical panels and the side panels are bonded and formed; The side plate is bonded to the first thin plate and the second thin plate.

5. A method for preparing a vent valve, characterized in that: For preparing the deflation valve according to any one of claims 1 to 4, the method comprises: Using metal parts to process and shape the support parts; Adhesively bonding the first thin plate and the support member to form a first assembly; Bonding a plurality of vertical panels to the first assembly to form a second assembly; The second assembly is glued together with the side plate and the second thin plate to form a deflation valve.

6. The method for preparing the vent valve according to claim 5, characterized in that: The first thin plate, the vertical plate and the second thin plate are made of reinforced carbon fiber and resin matrix epoxy resin.

7. The method for preparing a vent valve according to claim 6, characterized in that: The first assembly, the second assembly and the deflation valve are all formed by bonding in an autoclave.

8. The method for preparing a vent valve according to claim 7, characterized in that: The reinforcing carbon fiber is T800 grade carbon fiber, and the resin matrix epoxy resin is a high-temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 40%, and the molding temperature of the first assembly, the second assembly and the vent valve is 180°C±5°C, the time is 120min, and the pressure is 0.6MPa.

9. The method for preparing a vent valve according to claim 7, characterized in that: The reinforcing carbon fiber is T700 grade carbon fiber, and the resin matrix epoxy resin is a high-temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 38%, and the molding time of the first assembly, the second assembly and the deflation valve is 180 minutes, and the pressure is 0.3MPa.

10. The method for preparing a vent valve according to claim 7, characterized in that: The reinforcing carbon fiber is T300 grade carbon fiber, and the resin matrix epoxy resin is a high-temperature cured epoxy resin; wherein the resin matrix epoxy resin accounts for 33%, and the molding time of the first assembly, the second assembly and the deflation valve is 90 minutes, and the pressure is 0.3MPa.

11. The method for preparing a vent valve according to claim 7, characterized in that: The resin matrix epoxy resin is a medium-temperature curing epoxy resin; wherein the molding temperature of the first assembly, the second assembly and the deflation valve is 120°C±5°C and the pressure is 0.5MPa.

12. The method for preparing a vent valve according to claim 11, characterized in that: The reinforcing carbon fiber is T700 grade carbon fiber; wherein the proportion of the resin matrix epoxy resin is 38%, the molding time of the first assembly, the second assembly and the deflation valve is 180 minutes, and the pressure is 0.3 MPa.

13. The method for preparing a vent valve according to claim 11, characterized in that: The reinforcing carbon fiber is T300 grade carbon fiber; wherein the proportion of the resin matrix epoxy resin is 33%, the molding time of the first assembly, the second assembly and the deflation valve is 90 minutes, and the pressure is 0.6 MPa.

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