A sealing protection method for parts in a high-temperature alkali solution environment

Abstract

The present invention relates to the field of manufacturing aircraft engine structural parts, and is used for parts whose outer surfaces require cleaning with high-temperature alkali solution and whose inner cavities require sealing and protection. Disclosed is a method for sealing and protecting parts in a high-temperature alkali solution environment. A filling coating is applied to the sealing portion between a metal sheet and the outer wall of the part, so that the alkali solution cannot penetrate into the inner cavity of the part and dissolve the thermal insulation cotton, thereby preventing the thermal insulation cotton from being damaged by the action of high-temperature strong alkali, and at the same time improving the sealing performance of the inner cavity of the part.

Description

Technical Field

[0001] The present invention relates to the field of aero-engine structural component manufacturing, and is used for components whose outer surfaces require high-temperature alkali solution cleaning while whose inner cavities require sealing and protection. The invention specifically relates to a sealing and protection method for components in a high-temperature alkali solution environment. Background Art

[0002] Currently, due to the harsh operating environment of aircraft engine sealing rings, including high temperature, high pressure, and severe corrosion, the inner cavity of the parts must be equipped with insulation. The insulation is clamped around the outside of the sealing ring and sealed with a metal sheet. After the insulation is wrapped in the metal sheet, the parts must be cleaned in a 20% alkaline solution at 150°C for two hours. If the seal is not properly sealed during the cleaning process, the insulation will dissolve under the high temperature and strong alkaline solution. Summary of the Invention

[0003] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a sealing protection method for parts in a high-temperature alkali solution environment to solve the technical problem of poor sealing of the inner cavity of the parts in a high-temperature alkali solution environment in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A method for sealing and protecting parts in a high-temperature alkali solution environment comprises the following steps:

[0006] Step 1: Wrap the outer side of the part with insulation cotton, wrap the metal sheet on the insulation cotton and seal it on the outer wall of the part;

[0007] Step 2: Apply the filling paint to the seal between the metal sheet and the outer wall of the part, place it in a high temperature and let it stand, then air cool it;

[0008] Step 3: Tap the filling paint applied on the seal to check whether the filling paint is deformed. If it is deformed, reapply the filling paint; otherwise, proceed to step 4.

[0009] Step 4: clean the parts with high temperature strong alkali and soak them in high temperature strong alkali solution. After soaking, use high pressure water to clean the surface of the parts;

[0010] Step 5: Remove the filling paint and soak the parts after the filling paint is removed in cold water, and test the sealing of the parts. If the sealing is unqualified, return to step 2 and re-execute. Otherwise, complete the sealing protection work of the parts.

[0011] Preferably, in step 1, the metal sheet is wrapped around the thermal insulation cotton and encapsulated on the outer wall of the part by laser welding.

[0012] Preferably, in step 2, the materials for filling the coating are talc and water, wherein the talc and water are stirred at a volume ratio of 4:1 to 5:1, and the model of the talc is HS100.

[0013] Preferably, in step 2, the filling paint is loaded into a glue gun and coated on the sealing portion between the metal sheet and the outer wall of the part through the glue gun.

[0014] Preferably, in step 4, the parts coated with the filling paint are placed in an environment of 200° C. to 320° C. for 0.8 to 1.5 hours.

[0015] Preferably, in step 4, the parts are cleaned with a high-temperature strong alkali, wherein the high temperature is 150±10°C.

[0016] Preferably, in step 4, the parts are immersed in a high temperature strong alkali for 2 hours.

[0017] Preferably, in step 5, the filling paint is removed by tapping with a rubber stick.

[0018] Preferably, in step 5, the parts after the paint filling is removed are soaked in cold water for 2 hours.

[0019] Preferably, in step 5, pH test paper is used to check the sealing of the parts.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The present invention provides a method for sealing and protecting parts in a high-temperature alkali liquid environment, in which a filling coating is applied to the sealing portion between a metal sheet and the outer wall of the part, so that the alkali liquid cannot penetrate into the inner cavity of the part and dissolve the thermal insulation cotton, thereby preventing the thermal insulation cotton from being damaged by the action of high-temperature strong alkali, and at the same time improving the sealing performance of the inner cavity of the part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of the sealing protection method for parts in a high-temperature alkali solution environment of the present invention;

[0023] Figure 2 Schematic diagram of the sealing protection of parts in a high-temperature alkaline solution environment in the present invention.

[0024] In the figure: 1-parts; 2-insulation cotton; 3-metal sheet; 4-filling paint. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] The present invention is described in further detail below with reference to the accompanying drawings:

[0028] The purpose of the present invention is to provide a sealing and protection method for parts in a high-temperature alkali solution environment, so as to solve the technical problem of poor sealing of the inner cavity of the part in a high-temperature alkali solution environment in the prior art.

[0029] Specifically, according to Figure 1 and Figure 2 As shown, the sealing protection method for parts in a high-temperature alkali solution environment includes the following steps:

[0030] Step 1: Wrap the outer side of the component 1 with thermal insulation cotton 2, wrap the metal sheet 3 on the thermal insulation cotton 2 and seal it on the outer wall of the component 1;

[0031] Specifically, the metal sheet 3 is wrapped around the thermal insulation cotton 2 and encapsulated on the outer wall of the component 1 by laser welding.

[0032] Step 2: Apply the filling coating 4 to the seal between the metal sheet 3 and the outer wall of the part 1, and place it in a high temperature environment and allow it to cool in air.

[0033] Specifically, the filling coating 4 is made of talc and water, wherein the talc and water are mixed in a volume ratio of 4:1 to 5:1, and the model of the talc is HS100.

[0034] Step 3: tap the filling paint 4 applied on the sealing part to check whether the filling paint 4 is not deformed. If it is deformed, reapply the filling paint 4; otherwise, proceed to step 4.

[0035] Step 4, performing high-temperature strong alkali cleaning on the part 1, and soaking it in high-temperature strong alkali solution, and then using high-pressure water to clean the alkali solution on the surface of the part 1;

[0036] Specifically, the component 1 coated with the filling 4 coating is placed in an environment of 200° C. to 320° C. and allowed to stand for 0.8 to 1.5 hours.

[0037] Specifically, the part 1 is cleaned with a high-temperature strong alkali, wherein the high-temperature temperature is 150±10°C.

[0038] Specifically, the component 1 is immersed in a high-temperature strong alkali for 2 hours.

[0039] Step 5, remove the filling paint 4, and soak the part 1 after the filling paint 4 is removed in cold water, and check the sealing of the part 1. If the sealing is unqualified, return to step 2 and re-execute it. Otherwise, complete the sealing protection work of the part 1.

[0040] Specifically, the filling paint 4 is removed by tapping with a rubber stick.

[0041] Specifically, the component 1 after the paint 4 is removed is immersed in cold water for 2 hours.

[0042] Specifically, the sealing of the part 1 is checked using pH test paper.

[0043] Example 1

[0044] For example, the front sealing ring of an engine is a ring-shaped component wrapped with insulation foam, which is laser-welded from a metal sheet. Due to the part's processing flow, the insulation foam requires a high-temperature, strong-alkaline cleaning process after packaging, and sealing at designated locations to prevent contamination.

[0045] The specific method is as follows:

[0046] (1) Use talc to fill the paint and apply it to the parts of the workpiece that need to be sealed.

[0047] (2) The ratio of talc to water is 4:1. After stirring evenly, apply it to the area that needs to be sealed with a glue gun.

[0048] (3) Place the workpiece in an environment at 300°C for 1 hour and air cool it. Tap it lightly with a wooden hammer to check whether the coating is hard and not deformed.

[0049] (4) The workpiece is then cleaned with a high-temperature strong alkali at 150°C and soaked for 2 hours.

[0050] (5) Use high-pressure water to clean the surface of the alkali solution. Finally, it meets the design requirements.

[0051] (6) In order to avoid damaging the workpiece during the paint removal process, a plastic stick should be used to knock away the paint.

[0052] (7) Soak the workpiece after removing the paint in cold water for 2 hours, and then check the sealing of the workpiece with pH test paper.

[0053] Example 2

[0054] Taking the turbine blade of an engine as an example, the workpiece has a complex structure with an internal cavity. The outer surface needs to be cleaned with alkaline solution, and the inside needs to be prevented from entering the alkaline solution and cannot be cleaned. The inner wall of the workpiece needs to be protected from corrosion by the alkaline solution.

[0055] The specific method is as follows:

[0056] (1) Use talc to fill the paint and apply it to the parts of the workpiece that need to be sealed.

[0057] (2) The ratio of talc to water is 4:1. After stirring evenly, apply it to the area that needs to be sealed with a glue gun.

[0058] (3) Place the workpiece in an environment at 320°C for 0.8 hours and air cool it. Tap it lightly with a wooden hammer to check whether the coating is hard and not deformed.

[0059] (4) The workpiece is then cleaned with a high-temperature strong alkali at 150°C and soaked for 2 hours.

[0060] (5) Use high-pressure water to clean the surface of the alkali solution. Finally, it meets the design requirements.

[0061] (6) In order to avoid damaging the workpiece during the paint removal process, a plastic stick should be used to knock away the paint.

[0062] (7) Soak the workpiece after removing the paint in cold water for 2 hours, and then check the sealing of the workpiece with pH test paper.

[0063] Example 3

[0064] Taking the upper edge plate of the high-pressure blade of an engine as an example, this workpiece has a complex structure with an internal cavity. The outer surface needs to be cleaned with alkali solution, and the inside needs to be prevented from entering the alkali solution and cannot be cleaned. The inner wall of the workpiece needs to be protected from corrosion by the alkali solution.

[0065] The specific method is as follows:

[0066] (1) Use talc to fill the paint and apply it to the parts of the workpiece that need to be sealed.

[0067] (2) The ratio of talc to water is 4:1. After stirring evenly, apply it to the area that needs to be sealed with a glue gun.

[0068] (3) Place the workpiece in an environment of 230℃ for 1 hour and air cool it. Tap it lightly with a wooden hammer to check whether the coating is hard and not deformed.

[0069] (4) The workpiece is then cleaned with a high-temperature strong alkali at 150°C and soaked for 2 hours.

[0070] (5) Use high-pressure water to clean the surface of the alkali solution. Finally, it meets the design requirements.

[0071] (6) In order to avoid damaging the workpiece during the paint removal process, a plastic stick should be used to knock away the paint.

[0072] (7) Soak the workpiece after removing the paint in cold water for 2 hours, and then check the sealing of the workpiece with pH test paper.

[0073] Example 4

[0074] Taking the nozzle of an engine as an example, the workpiece has a complex structure with an internal cavity. The outer surface needs to be cleaned with alkaline solution, and the inside needs to be prevented from entering the alkaline solution and cannot be cleaned. The inner wall of the workpiece needs to be protected from corrosion by the alkaline solution.

[0075] The specific method is as follows:

[0076] (1) Use talc to fill the paint and apply it to the parts of the workpiece that need to be sealed.

[0077] (2) The ratio of talc to water is 5:1. After stirring evenly, apply it to the area that needs to be sealed with a glue gun.

[0078] (3) Place the workpiece in an environment at 300°C for 1 hour and air cool it. Tap it lightly with a wooden hammer to check whether the coating is hard and not deformed.

[0079] (4) The workpiece is then cleaned with a high-temperature strong alkali at 150°C and soaked for 2 hours.

[0080] (5) Use high-pressure water to clean the surface of the alkali solution. Finally, it meets the design requirements.

[0081] (6) In order to avoid damaging the workpiece during the paint removal process, a plastic stick should be used to knock away the paint.

[0082] (7) Soak the workpiece after removing the paint in cold water for 2 hours, and then check the sealing of the workpiece with pH test paper.

[0083] In summary, the present invention provides a method for sealing and protecting parts in a high-temperature alkaline solution environment, in which a filling coating is applied to the sealing portion between the metal sheet and the outer wall of the part, so that the alkaline solution cannot penetrate into the inner cavity of the part and dissolve the thermal insulation cotton, thereby preventing the thermal insulation cotton from being damaged by the action of high-temperature strong alkali, and at the same time improving the sealing performance of the inner cavity of the part.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for sealing and protecting parts in a high-temperature alkali solution environment, characterized in that: The steps include: Step 1: Wrap the outer side of the component (1) with thermal insulation cotton (2), wrap the metal sheet (3) on the thermal insulation cotton (2) and seal it on the outer side wall of the component (1); The metal sheet (3) is wrapped around the thermal insulation cotton (2) and is sealed on the outer wall of the component (1) by laser welding; Step 2: applying the filling coating (4) to the sealing portion between the metal sheet (3) and the outer wall of the component (1), placing the metal sheet (3) at high temperature and then cooling the metal sheet in air; The filling coating (4) is made of talc and water, wherein the talc and water are mixed in a volume ratio of 4:1 to 5:1, and the model of the talc is HS100; The filling paint (4) is loaded into the glue gun and applied to the sealing portion between the metal sheet (3) and the outer wall of the component (1) by the glue gun; Step 3, knock the filling paint (4) applied on the sealing part to check whether the filling paint (4) is not deformed. If it is deformed, re-apply the filling paint (4); otherwise, proceed to step 4; Step 4, cleaning the part (1) with a high-temperature strong alkali solution and soaking it in a high-temperature strong alkali solution, and then cleaning the surface of the part (1) with high-pressure water; The component (1) after being coated with the filling coating (4) is placed in an environment of 200°C to 320°C for 0.8 to 1.5 hours; The part (1) is cleaned with a high temperature strong alkali, wherein the high temperature is 150±10°C; Step 5, remove the filling paint (4), and soak the part (1) after the filling paint (4) is removed in cold water, and detect the sealing of the part (1). If the sealing is unqualified, return to step 2 and re-execute. Otherwise, complete the sealing protection work of the part (1).

2. The sealing and protection method for parts in a high-temperature alkali solution environment according to claim 1, characterized in that: In step 4, the part (1) is immersed in a high temperature strong alkali for 2 hours.

3. The sealing and protection method for parts in a high-temperature alkali solution environment according to claim 1, characterized in that: In step 5, the filling paint (4) is removed by tapping with a rubber stick.

4. The method for sealing and protecting parts in a high-temperature alkaline solution environment according to claim 1, characterized in that: In step 5, the part (1) after the paint (4) is removed is immersed in cold water for 2 hours.

5. The method for sealing and protecting parts in a high-temperature alkali solution environment according to claim 1, characterized in that: In step 5, the sealing of the part (1) is checked using pH test paper.

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