A drain plug device for an aeroengine oil line

Abstract

The application provides a kind of oil drain magnetic plug device for aero-engine lubricating oil pipeline, comprising: the shell assembly opposite fixed with oil return pipeline, shell assembly includes shell, top cover and shell spring, shell side wall has the main flow-through hole of vertical axis, top cover is placed in the internal top end of shell, shell spring is placed between shell and top cover;The oil drain magnetic rod assembly placed in the shell assembly, the oil drain magnetic rod assembly includes oil drain rod, magnetic rod assembly and magnetic rod spring, the oil drain rod includes oil drain rod main body and the piston body opposite fixed with oil drain rod main body, the inside of oil drain rod main body has the oil drain hole of axial through, magnetic rod assembly includes support cylinder and the magnetic body fixed in the top of support cylinder, support cylinder top is equipped with oil drain hole, oil drain rod is placed in magnetic rod assembly and is connected by magnetic rod spring;By pulling oil drain rod, lubricating oil in oil return pipeline can enter oil drain hole from main flow-through hole, then flow out from the oil drain hole of oil drain rod main body, realize the access of lubricating oil.

Description

Technical Field

[0001] This application belongs to the field of aircraft engine maintenance technology, and specifically relates to an oil draining magnetic plug device for aircraft engine lubricating oil pipelines. Background Technology

[0002] The main shaft bearings and transmission gears in an aero-gas turbine engine are crucial power transmission components. To ensure the smooth operation of these friction pairs, lubricating oil is typically used for lubrication and cooling. During operation, these components generate metal debris. To monitor for abnormal wear or structural damage, it is necessary to periodically sample the lubricating oil for spectral analysis and to inspect it for metal debris. The presence of various metal elements in the lubricating oil spectrum or the composition of the metal debris is used to determine if abnormal wear is present in the main shaft bearings, transmission gears, and other components.

[0003] To periodically collect lubricating oil and check for metal shavings, the prior art uses a drain magnetic plug structure (including a drain valve 12 and a drain magnetic rod 11) installed in the lubricating oil return line 13. The lubricating oil is collected and checked for metal shavings by inserting and removing the drain magnetic rod 11. Figure 1 As shown.

[0004] However, the above-mentioned oil drain magnetic plug structure has two drawbacks:

[0005] 1) The procedure for taking a lubricating oil sample from the drain plug is too complicated.

[0006] To prevent the drain rod 11 from falling off, it is fixed to the drain valve 12 with a fuse during installation. Therefore, the fuse must be removed each time a lubricating oil sample is taken, and the fuse must be replaced after the lubricating oil sample is taken. At the same time, when taking a lubricating oil sample, after removing the drain rod 11, a special tool must be inserted into the drain valve 12 to take the lubricating oil. The operation steps are too cumbersome, and special tools are required to complete the lubricating oil sample taking, which increases the workload of ground staff and affects the engine's restart efficiency.

[0007] 2) Secondly, the lubricating oil has a relatively fast flow rate, which poses a risk that metal shavings may not be adsorbed;

[0008] Because the lubricating oil in the return line 13 of the lubricating oil system flows at a relatively fast speed, there is a risk that abnormally worn metal shavings in the lubricating oil may not be attracted by the drain magnet 11, which may result in the failure to detect abnormal wear or damage to the main shaft bearing, transmission gears, etc. during the regular inspection of the engine. Summary of the Invention

[0009] The purpose of this application is to provide a drain magnetic plug device for lubricating oil lines of aircraft engines to solve or mitigate at least one of the problems in the prior art.

[0010] The technical solution of this application is: an oil draining magnetic plug device for an aircraft engine lubricating oil pipeline, the oil draining magnetic plug assembly comprising:

[0011] A housing assembly fixed relative to the return oil pipeline, the housing assembly includes a housing, a top cover and a housing spring, the housing is hollow inside and the side wall of the housing has a main flow hole that is perpendicular to the axis and passes through it, the main flow hole is used for the lubricating oil in the return oil pipeline to pass through, the top cover is placed at the inner top of the housing, and the housing spring is placed between the housing and the top cover;

[0012] An oil draining magnetic rod assembly is placed inside the housing assembly. The oil draining magnetic rod assembly includes an oil draining rod, a magnetic rod assembly, and a magnetic rod spring. The oil draining rod includes an oil draining rod body and a piston body fixed relative to the oil draining rod body. The oil draining rod body has an axially penetrating oil draining hole inside. The magnetic rod assembly includes a support cylinder and a magnetic body fixed to the top of the support cylinder. The top of the support cylinder is provided with an oil discharge hole. The oil draining rod is placed inside the magnetic rod assembly and connected by the magnetic rod spring.

[0013] By pulling the oil drain rod in the oil drain magnetic rod assembly, the lubricating oil in the return oil pipeline can enter the oil discharge hole of the support cylinder from the main flow through hole, and then flow out from the oil drain hole of the oil drain rod body, thus realizing the collection of lubricating oil.

[0014] In a preferred embodiment of this application, the top of the housing has a boss extending along the axis, and an annular gap is formed between the boss and the side wall of the housing, the annular gap constituting a mounting groove for the housing spring and the top cover.

[0015] In a preferred embodiment of this application, the top inner side of the housing is provided with an oil drain rod mounting groove, and the top end of the oil drain rod body is inserted into the oil drain rod mounting groove.

[0016] In a preferred embodiment of this application, a limiting groove is provided on the bottom inner wall of the housing, and a limiting rod is provided on the side of the support cylinder of the magnetic rod assembly. The oil draining magnetic rod assembly and the housing assembly are detachably connected through the cooperation of the limiting groove and the limiting rod.

[0017] In a preferred embodiment of this application, the limiting groove includes an axial limiting groove parallel to the axis and a circumferential limiting groove that connects to the axial limiting groove and extends circumferentially. The limiting rod in the magnetic rod assembly first moves along the axial limiting groove and then rotates along the circumferential limiting groove, thereby achieving relative fixation between the oil draining magnetic rod assembly and the housing assembly.

[0018] In a preferred embodiment of this application, the top cover is provided with a protrusion, which rests on the magnetic body.

[0019] In a preferred embodiment of this application, at least one sealing groove is provided on the outer surface of the piston body and the support cylinder of the magnetic rod assembly for placing a sealing ring.

[0020] In a preferred embodiment of this application, the piston body has a hollow structure to reduce structural weight.

[0021] In a preferred embodiment of this application, both the housing spring and the magnetic rod spring are compression springs.

[0022] This application enables the rapid collection of lubricating oil samples using a drain magnetic plug device without removing the fuse or preparing special tools. By designing a flow-stabilizing cavity structure within the housing assembly, the flow rate of the rapidly flowing lubricating oil is reduced, making it easier for foreign objects such as metal shavings to be attracted to the magnetic rod. Attached Figure Description

[0023] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0024] Figure 1 This is a schematic diagram of the existing oil drain magnetic plug structure.

[0025] Figure 2 This is a schematic diagram of the oil draining magnetic plug device of this application.

[0026] Figure 3 This is a schematic diagram of the oil drain magnetic plug assembly of this application.

[0027] Figure 4 This is a schematic diagram of the drain rod in this application.

[0028] Figure 5 This is a perspective view of the drain rod in this application.

[0029] Figure 6 This is a schematic diagram of the magnetic rod assembly of this application.

[0030] Figure 7 This is a perspective view of the magnetic rod assembly of this application.

[0031] Figure 8 This is a schematic diagram of the magnetic rod spring of this application.

[0032] Figure 9 This is a schematic diagram of the housing assembly of this application.

[0033] Figure 10 This is a schematic diagram of the casing of this application.

[0034] Figure 11 This is a perspective view of the shell of this application.

[0035] Figure 12 This is a schematic diagram of the top cover of this application.

[0036] Figure 13 This is a perspective view of the top cover of this application.

[0037] Figure 14 This is a schematic diagram of the housing spring of this application.

[0038] Figure 15 This is a schematic diagram of the oil discharge magnetic plug device in the oil receiving state of this application.

[0039] Figure label:

[0040] 20-Oil drain plug device

[0041] 21-Oil draining magnetic rod assembly

[0042] 211-Flush rod

[0043] 2111-Flush rod body

[0044] 2112-Piston Body

[0045] 2113-Oil drain hole

[0046] 2114-Oil drain sealing groove

[0047] 212-Magnetic Rod Assembly

[0048] 2121-Support cylinder

[0049] 2122-Magnetic Body

[0050] 2123-Limit Rod

[0051] 2124-Magnetic Rod Sealing Groove

[0052] 2125 - Oil unloading hole

[0053] 2126-Oil drain rod mounting slot

[0054] 2127-Magnetic rod spring mounting slot

[0055] 213-Magnetic Rod Spring

[0056] 22-Housing assembly

[0057] 221-Shell

[0058] 2211-Sidewall

[0059] 2212-Protrusion

[0060] 2213-Annular Gap

[0061] 2214 - Mainstream Through Hole

[0062] 2215-Limiting Groove

[0063] 2215A-Axial limiting groove

[0064] 2215B-Circumferential Limiting Groove

[0065] 222-Top Cover

[0066] 2221-Top Cover Side Wall

[0067] 2221-Protrusion

[0068] 223-House Spring

[0069] 23-Return oil line Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0071] This application provides a magnetic plug assembly for draining lubricating oil from an aircraft engine's lubricating oil pipeline. This assembly enables rapid collection of lubricating oil samples without removing fuses or preparing special tools, reducing the maintenance workload for ground crew and improving engine restart efficiency. Simultaneously, it slows down the flow rate of the rapidly passing lubricating oil, making it easier for foreign objects such as metal shavings to adhere to the magnetic rod. This facilitates the timely detection of abnormal wear on components such as main shaft bearings and transmission gears.

[0072] like Figure 2 As shown, the oil draining magnetic plug device 20 for the lubricating oil pipeline of an aircraft engine provided by the present invention includes an oil draining magnetic rod assembly 21 and a housing assembly 22.

[0073] like Figure 3 As shown, the oil draining magnetic rod assembly 21 includes an oil draining rod 211, a magnetic rod assembly 212, and a magnetic rod spring 213.

[0074] like Figure 4 and Figure 5 As shown, the drain rod 211 includes a drain rod body 2111 and a piston body 2112 fixed relative to the drain rod body 2111. The drain rod body 2111 has an axially penetrating drain hole 2113 inside, and the outer surface of the piston body 2112 is provided with at least one sealing groove 2114 for placing a sealing ring. In a preferred embodiment of this application, the piston body 2112 is configured with a hollow structure inside to reduce structural weight.

[0075] like Figure 6 and Figure 7As shown, the magnetic rod assembly 212 includes a support cylinder 2121, which is a cylindrical structure with a hollow interior. A cylindrical magnetic body 2122 is fixed to the top of the support cylinder 2121 to adsorb metal shavings in the lubricating oil pipeline. Multiple oil drain holes 2125 are provided around the magnetic body 2122 at the top of the support cylinder 2121, and these holes are evenly distributed along the axis of the magnetic body 2122. At least one magnetic rod sealing groove 2124 is provided on the side of the support cylinder 2121 for placing a sealing ring, and two symmetrically arranged limiting rods 2123 perpendicular to the axis are provided on the side of the support cylinder 2121. The top of the inside of the support cylinder 2121 is provided with an oil drain rod mounting groove 2126. The top of the oil drain rod body 2111 of the oil drain rod 211 can be inserted into the oil drain rod mounting groove 2126. The lower middle side of the inside of the support cylinder 2121 is provided with a radially extending magnetic rod spring mounting groove 2127 for limiting the magnetic rod spring 213.

[0076] like Figure 8 As shown, the magnetic rod spring 213 is a compression spring.

[0077] Recombined Figure 3 As shown, the top end of the drain rod 211 is inserted into the drain rod mounting groove 2126 of the magnetic rod assembly 212. A sealing ring is placed in the magnetic rod sealing groove 2124 of the drain rod 211 to achieve a relative seal between the drain rod 211 and the magnetic rod assembly 212. The magnetic rod spring 213 is disposed between the drain rod 211 and the magnetic rod assembly 212, with its two ends contacting the piston body 2112 of the drain rod 211 and the magnetic rod spring mounting groove 2127 of the magnetic rod assembly 212, respectively. By pulling the drain rod 211, the relative movement and reset of the drain rod 211 and the magnetic rod assembly 212 can be achieved.

[0078] like Figure 9 As shown, the housing assembly 22 consists of a housing 221, a top cover 222, and a housing spring 223.

[0079] like Figure 10 and Figure 11As shown, the housing 221 has a cylindrical structure with a hollow interior. A boss 2212 extending along the axis is located at the top of the housing 221. An annular gap 2213 exists between the boss 2212 and the side wall 2211 of the housing 221, which serves as a mounting groove for the housing spring 223 and the top cover 222. A main flow hole 2214, perpendicular to the axis and penetrating through, is located approximately at the center of the side wall 2211 of the housing 221, allowing lubricating oil from the return oil line to pass through. The bottom inner wall of the housing 221 is provided with a limiting groove 2215. The limiting groove 2215 includes an axial limiting groove 2215A parallel to the axis and a circumferential limiting groove 2215B that connects to the axial limiting groove 2215A and extends circumferentially. The limiting rod 2123 in the magnetic rod assembly 212 first moves along the axial limiting groove 2215A and then rotates along the circumferential limiting groove 2215B, which can realize the relative fixation of the oil draining magnetic rod assembly 21 and the housing assembly 22.

[0080] like Figure 12 and Figure 13 As shown, the top cover 222 is cylindrical and hollow inside. The end of the top cover 222 has a protrusion 2222, which rests on the magnetic body 2122, so that a flow channel for lubricating oil to flow smoothly is formed between the top cover 222 and the magnetic body 2122.

[0081] like Figure 14 As shown, the housing spring 223 is also a compression spring.

[0082] Recombined Figure 9 As shown, the housing spring 223 is placed in the annular gap 2213 of the housing 221, and the top cover 222 is fastened on the housing spring 223, thereby forming the housing assembly 22. The protrusion 2222 at the end of the top cover 222 is located within the outline of the main flow hole 2214 of the housing 221.

[0083] In use, the housing assembly 22 is installed in the return oil line 23 of the engine lubricating oil system. The drain magnetic rod assembly 21 is inserted into the housing assembly 22 through the opening of the housing assembly 22. The boss 2212 in the housing assembly 22 presses against the magnetic body 2122 of the magnetic rod assembly 212. The drain magnetic rod assembly 21 and the housing assembly 22 are relatively fixedly connected by the cooperation of the limiting rod 2123 and the limiting groove 2215.

[0084] When the engine requires lubricating oil sampling, pull down the drain rod 221 in the drain magnetic rod assembly 21. The drain rod 221 compresses the magnetic rod spring 213, and part of the lubricating oil in the return oil line 23 continues to flow along the return oil line 23 through the main flow through hole 2214 in the housing assembly 22. Part of the lubricating oil enters the support cylinder 2121 from the cavity of the housing 221 along the drain hole 2125 of the magnetic rod assembly 212, and then flows out of the drain magnetic plug device 20 along the drain hole 2113 of the drain rod body 2111, thus achieving rapid sampling of the lubricating oil. After the lubricating oil sample is collected, release the drain rod 211. Under the action of the magnetic rod spring 213, the end of the drain rod 211 is inserted into the drain rod mounting groove 2126 of the support cylinder 2121, restoring the sealing state of the lubricating oil flow path.

[0085] In this application, the housing 221 and the top cover 222 can form a flow stabilizing cavity with a flow stabilizing effect. When the lubricating oil flows through the flow stabilizing cavity, the flow speed will be reduced, making it easier for the magnetic body 2122 on the magnetic rod assembly 212 to adsorb metal shavings in the lubricating oil, which is beneficial for detecting abnormal wear of components such as main shaft bearings and transmission gears.

[0086] This application, by designing a hollow oil drain rod 211 in the oil drain magnetic rod assembly 21, enables the oil drain magnetic plug device to quickly collect lubricating oil samples without removing the fuse or preparing special tools. By designing a flow stabilizing cavity structure within the housing assembly 22, the flow rate of the rapidly flowing lubricating oil is reduced, making it easier for foreign objects such as metal shavings to be attracted to the magnetic rod.

[0087] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A drain magnetic plug device for lubricating oil lines in aircraft engines, characterized in that, The oil drain magnetic plug assembly includes: A housing assembly fixed relative to the return oil pipeline, the housing assembly includes a housing, a top cover and a housing spring, the housing is hollow inside and the side wall of the housing has a main flow hole that is perpendicular to the axis and passes through it, the main flow hole is used for the lubricating oil in the return oil pipeline to pass through, the top cover is placed at the inner top of the housing, and the housing spring is placed between the housing and the top cover; An oil draining magnetic rod assembly is placed inside the housing assembly. The oil draining magnetic rod assembly includes an oil draining rod, a magnetic rod assembly, and a magnetic rod spring. The oil draining rod includes an oil draining rod body and a piston body fixed relative to the oil draining rod body. The oil draining rod body has an axially penetrating oil draining hole inside. The magnetic rod assembly includes a support cylinder and a magnetic body fixed to the top of the support cylinder. The top of the support cylinder is provided with an oil discharge hole. The oil draining rod is placed inside the magnetic rod assembly and connected by the magnetic rod spring. By pulling the oil drain rod in the oil drain magnetic rod assembly, the lubricating oil in the return oil pipeline can enter the oil discharge hole of the support cylinder from the main flow through hole, and then flow out from the oil drain hole of the oil drain rod body, thus realizing the collection of lubricating oil.

2. The drain magnetic plug device for lubricating oil lines of aircraft engines as described in claim 1, characterized in that, The top of the housing has a boss extending along the axis, and an annular gap is formed between the boss and the side wall of the housing, which constitutes the mounting groove for the housing spring and the top cover.

3. The drain magnetic plug device for an aircraft engine lubricating oil pipeline as described in claim 1 or 2, characterized in that, The top inner side of the housing is provided with an oil drain rod mounting groove, and the top end of the oil drain rod body is inserted into the oil drain rod mounting groove.

4. The drain magnetic plug device for lubricating oil lines of aircraft engines as described in claim 3, characterized in that, The bottom inner wall of the housing is provided with a limiting groove, and the side of the support cylinder of the magnetic rod assembly is provided with a limiting rod. The limiting groove and the limiting rod cooperate to realize the detachable connection between the oil draining magnetic rod assembly and the housing assembly.

5. The drain magnetic plug device for an aircraft engine lubricating oil pipeline as described in claim 4, characterized in that, The limiting groove includes an axial limiting groove parallel to the axis and a circumferential limiting groove that connects to the axial limiting groove and extends circumferentially. The limiting rod in the magnetic rod assembly first moves along the axial limiting groove and then rotates along the circumferential limiting groove, thereby achieving relative fixation between the oil draining magnetic rod assembly and the housing assembly.

6. The drain magnetic plug device for an aircraft engine lubricating oil pipeline as described in claim 1, characterized in that, The top cover has a protrusion that rests on the magnetic body.

7. The drain magnetic plug device for an aircraft engine lubricating oil pipeline as described in claim 1, characterized in that, The piston body and the support cylinder of the magnetic rod assembly have at least one sealing groove on their outer surfaces for placing a sealing ring.

8. The drain magnetic plug device for an aircraft engine lubricating oil pipeline as described in claim 5, characterized in that, The piston body has a hollow interior to reduce structural weight.

9. The drain magnetic plug device for an aircraft engine lubricating oil pipeline as described in claim 1, characterized in that, Both the housing spring and the magnetic rod spring are compression springs.

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