Pressing type oil drain plug assembly

Abstract

The utility model belongs to the technical field of aviation power systems, and discloses a pressing type drain plug assembly which is characterized by comprising a drain plug, a wave spring, a fixed end cover, a sliding ring, a sealing seat and a connecting pin. The oil drain plug is installed on a starter body structure through external threads, a through hole is formed in the middle of the oil drain plug, a positioning groove is formed in the bottom face of the oil drain plug, and the wave spring is installed in the positioning groove. A rail is arranged on the cylindrical surface below the hexagonal surface of the drain plug and guides and controls the movement of the fixed end cover and the sliding ring; and the sealing seat is arranged outside the fixed end cover and the sliding ring. The oil drainage bolt assembly is good in sealing performance, rapid oil drainage can be achieved in a manual pressing mode, the service life of the oil drainage bolt assembly is greatly prolonged, and the reliability of the oil drainage bolt assembly is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of aviation power system technology, and relates to an oil drain plug and a press-type oil drain plug assembly. Background Technology

[0002] The drain plug assembly is widely used in air turbine starters for aircraft engines. It is generally used during ground maintenance of the air turbine starter and is opened to drain all the lubricating oil in the starter chamber.

[0003] Existing drain plug assemblies use a screw-on seal, requiring the use of wrenches or other tools to open, which affects the convenience of maintenance and easily causes contamination of the engine compartment and equipment. Currently, many drain plug assemblies use hexagonal head structures, requiring maintenance personnel to unscrew them with a fixed wrench or other tools during ground maintenance to drain the oil from the starter cavity. This method has two drawbacks: first, it requires readily available disassembly and installation tools; second, oil begins to seep out during plug removal, contaminating the engine compartment, tools, and personnel; and third, repeated removal and installation of the plug from the starter housing can damage the sealing ring, creating a risk of leakage. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a press-type drain plug assembly that eliminates the need for tools when opening the drain plug, allowing it to be used by hand while ensuring a smoother draining process.

[0005] The technical solution of this utility model is as follows:

[0006] A press-type drain plug assembly is characterized by comprising a drain plug, a wave spring, a fixed end cap, a sliding ring, a sealing seat, and a connecting pin; the drain plug is installed in the starter motor body structure via an external thread, a through hole is provided in the middle of the drain plug, a positioning groove is provided on the bottom surface of the drain plug, and the wave spring is installed in the positioning groove; a track is provided on the cylindrical surface below the hexagonal surface of the drain plug, the track guides and controls the movement of the fixed end cap and the sliding ring; the sealing seat is located outside the fixed end cap and the sliding ring.

[0007] Furthermore, the wave spring adopts a three-peak, three-trough structure.

[0008] Furthermore, the inner cylindrical surface of the fixed end cover is provided with four No. 1 limit blocks, which are used to cooperate with the track on the drain plug. The outer cylindrical surface of the fixed end cover is provided with a first pin hole, which is fixed to the sealing seat by connecting pin.

[0009] Furthermore, the inner cylindrical surface of the sliding ring is provided with four No. 2 limit blocks, which are used to cooperate with the track on the drain plug and move along the track.

[0010] Furthermore, the inner cylindrical surface of the sealing seat is provided with 8 columnar blocks, which are used to push the No. 2 limit block on the sliding ring to make it move axially; the outer surface of the sealing seat is provided with pin holes, which are fixed to the fixed end cover by connecting pins.

[0011] Furthermore, the connecting pin is used to secure the end cap and the sealing seat.

[0012] Furthermore, the inner surface of the bottom of the sealing seat is vulcanized with FS6265 rubber gasket to seal the through hole on the drain plug.

[0013] Furthermore, the bottom of the sealing seat is provided with four oil drain holes. When the rubber gasket separates from the drain plug hole, the lubricating oil flows out from the oil drain holes.

[0014] Furthermore, the sliding ring is made of SFB-2 material to accommodate sliding requirements.

[0015] The advantages of this utility model are:

[0016] This invention has good sealing performance and can quickly release oil by manually pressing it, which greatly increases the service life and reliability of the oil drain bolt assembly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model patent, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model patent, and therefore should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the drain plug in this utility model.

[0019] Figure 2 for Figure 1 A bottom view.

[0020] Figure 3 for Figure 1 Axis view.

[0021] Figure 4 This is a schematic diagram of the wave spring in this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the fixed end cap in this utility model;

[0023] Figure 6 for Figure 5 A side sectional view.

[0024] Figure 7 This is a schematic diagram of the sliding ring in this utility model.

[0025] Figure 8 for Figure 7 A side sectional view.

[0026] Figure 9 This is a schematic diagram of the sealing seat in this utility model.

[0027] Figure 10 for Figure 9 A bottom view.

[0028] Figure 11 for Figure 9 A sectional view.

[0029] Figure 12 This is a schematic diagram of the structure of this utility model.

[0030] Figure 13 This is a schematic diagram showing the positions of each structure in the initial closed state of this utility model.

[0031] Figure 14 This is a schematic diagram showing the positions of each structure in the open state of this utility model.

[0032] Among them, 1—oil drain plug, 2—wave spring, 3—fixed end cap, 4—sliding ring, 5—sealing seat, 6—connecting pin;

[0033] 11—track, 12—positioning groove;

[0034] 21—Crest, 22—Trough;

[0035] 31—Limiting block No. 1, 32—First pin hole;

[0036] 41—Limiting block No. 2, 51—Second pin hole, 52—Rubber pad, 53—Oil drain hole, 54—Columnar block. Detailed Implementation

[0037] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the orientation or positional relationships in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Example 1:

[0041] A press-type drain plug assembly includes: a drain plug 1, a wave spring 2, a fixed end cap 3, a sliding ring 4, a sealing seat 5, and a connecting pin 6;

[0042] The drain plug 1 is threaded onto the starter motor body structure, with a through hole in the middle for draining oil and a positioning groove on the bottom surface for radial and axial positioning of the wave spring during operation. A track is provided on the cylindrical surface below the hexagonal face of the drain plug to guide and control the movement of the fixed end cap and sliding ring. Figure 1-3 As shown.

[0043] Wave spring 2 adopts a three-peak, three-trough structure and is made of QBe2 beryllium bronze to accommodate its relatively long working stroke. Figure 4 As shown.

[0044] The inner cylindrical surface of the fixed end cap 3 is provided with four No. 1 limit blocks, which are used to mate with the track on the drain plug. The outer cylindrical surface of the fixed end cap is provided with pin holes, which are used to fix it to the sealing seat through connecting pins. Figure 5-6 As shown.

[0045] The inner cylindrical surface of the sliding ring 4 is equipped with four No. 2 limit blocks, which are used to cooperate with the track on the drain plug and move along the track. Figure 7-8 As shown.

[0046] The inner cylindrical surface of the sealing seat 5 has eight columnar blocks to push the No. 2 limit block on the sliding ring, causing it to move axially. The outer surface of the sealing seat has pin holes for fixing it to the fixed end cover via connecting pins. Figure 9-11 As shown.

[0047] Connecting pin 6 is used to secure the fixed end cap and sealing seat.

[0048] The inner surface of the bottom of the sealing seat 5 is vulcanized with FS6265 rubber gasket, which is used to seal the through hole on the drain plug.

[0049] The bottom of the sealing seat 5 is provided with 4 oil drain holes. When the rubber gasket separates from the drain plug hole, the lubricating oil flows out from the oil drain hole.

[0050] The sliding ring is made of SFB-2 material to accommodate sliding requirements.

[0051] The connecting pin is interference-fitted with the first radial pin hole.

[0052] The connecting pin is clearance-fitted with the first radial pin hole.

[0053] Example 2:

[0054] like Figure 6 As shown, the structure of the present invention mainly includes: an oil drain plug 1, a wave spring 2, a fixed end cap 3, a sliding ring 4, a sealing seat 5, and a connecting pin 6, wherein the oil drain plug is connected to the air turbine starter body through an external thread.

[0055] The assembly process of this invention is as follows: Using the drain plug as the installation reference, first, place the wave spring into the positioning groove on the bottom surface of the drain plug. Then, align the No. 1 limiting block of the fixed end cap with the drain plug track notch and install it into the drain plug. Next, align the No. 2 limiting block of the sliding ring with the drain plug track notch and install it into the sliding ring. Then, align the eight columnar blocks of the sealing seat with the drain plug track notch, with the rubber pad facing upwards, and install the sealing seat until it contacts the fixed end cap, while aligning the pin holes of the sealing seat and the fixed end cap. Finally, install the two connecting pins.

[0056] The disassembly process of this invention is as follows: First, forcefully push the two connecting pins inward until the sealing seat disengages downward. Then, remove the two connecting pins from the fixed end cover. Next, align the sliding ring No. 2 limiting block with the notch in the drain plug track and remove it downward. Then, align the fixed end cover No. 1 limiting block with the notch in the drain plug track and remove it downward. Finally, remove the wave spring.

[0057] like Figure 13As shown, the initial state of this invention is the closed state, with the first limiting block of the fixed end cap suspended in the air, and the second limiting block of the sliding ring locked into the middle low rail position under the pressure of the wave spring. The eight columnar blocks of the sealing seat are positioned within the notch of the drain plug track. At this time, the rubber gasket of the sealing seat blocks the drain plug through hole under the constraint of the structural dimensions.

[0058] When the invention is switched from the closed state to the open state, pressing the sealing seat upwards causes the No. 2 limiting block of the sliding ring to be pushed out from the middle low rail position of the drain plug track by the eight columnar blocks of the sealing seat, and slide down the right slope of the track (the movement trajectory shown by the arrow in the figure) into the notch of the track. The fixed end cover and the sliding ring will move downwards as a whole until the No. 1 limiting block of the fixed end cover is engaged in the middle low rail position of the drain plug track (the movement trajectory shown by the arrow in the figure), and the entire assembly stops moving. At this time, the rubber gasket inside the sealing seat separates from the drain plug through hole, and lubricating oil flows out from the sealing seat.

[0059] like Figure 14 As shown, when the invention changes from the open state to the closed state, pressing the sealing seat upwards causes the eight columnar blocks of the sealing seat to push the No. 2 limiting block of the sliding ring out of the notch in the drain plug track. The No. 2 limiting block then slides down the right-side ramp of the track and locks into the middle low rail position (the movement trajectory shown by the arrow in the figure). The No. 1 limiting block on the fixed end cover is now in a suspended state again. At this time, the drain plug assembly returns to its original position. Figure 13 When closed, the rubber gasket of the sealing seat blocks the drain plug hole.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should be covered within the protection scope of this utility model.

Claims

1. A press-type drain plug assembly, characterized in that, It includes a drain plug (1), a wave spring (2), a fixed end cap (3), a sliding ring (4), a sealing seat (5), and a connecting pin (6); the drain plug (1) is installed on the starter body structure through an external thread, the drain plug (1) has a through hole in the middle, the drain plug (1) has a positioning groove on the bottom surface, and the wave spring (2) is installed in the positioning groove; the cylindrical surface below the hexagonal surface of the drain plug (1) is provided with a track, which guides and controls the movement of the fixed end cap (3) and the sliding ring (4); the sealing seat (5) is located outside the fixed end cap (3) and the sliding ring (4).

2. The press-type drain plug assembly according to claim 1, characterized in that, The wave spring (2) has a structure with three peaks and three troughs.

3. The press-type drain plug assembly according to claim 1, characterized in that, The inner cylindrical surface of the fixed end cap (3) is provided with a No. 1 limiting block, which is used to cooperate with the track on the drain plug (1); the outer cylindrical surface of the fixed end cap (3) is provided with a first pin hole, which is fixed to the sealing seat (5) by connecting pin (6).

4. The press-type drain plug assembly according to claim 1, characterized in that, The inner cylindrical surface of the sliding ring (4) is provided with a No. 2 limiting block, which is used to cooperate with the track on the drain plug (1) so that the sliding ring (4) moves along the track.

5. The press-type drain plug assembly according to claim 1, characterized in that, The inner cylindrical surface of the sealing seat (5) is provided with a columnar block, which is used to push the No. 2 limit block on the sliding ring (4) to make the sliding ring (4) move axially.

6. The press-type drain plug assembly according to claim 1, characterized in that, The bottom inner surface of the sealing seat (5) is provided with a vulcanized FS6265 rubber pad.

7. A press-type drain plug assembly according to claim 1, characterized in that, The bottom of the sealing seat (5) is provided with an oil drain hole.

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