Oil drainage device for lubricating oil filter of aero-engine
By designing an oil drain device composed of a T-shaped oil drain screw and an oil drain screw seat, the problems of easy damage and inconvenient operation of the sealing valve in the prior art are solved, and the oil draining effect of the aircraft engine oil filter with high reliability and easy operation is achieved.
Patent Information
- Application Number
- CN202422673527.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-11-01
AI Technical Summary
The oil drain device of the existing aircraft engine oil filter is prone to damage to the sealing valve during operation, and is inconvenient to operate in a space-constrained environment, resulting in safety hazards and operational difficulties.
An oil drain device including an oil drain screw seat and an oil drain screw is designed. The oil drain screw and the oil drain screw seat are combined with a T-shaped structure. A sealing ring and threaded connection are used to achieve reliable sealing and operation, and the oil drain operation can be performed using common tools.
The oil drain device has a simple structure, high reliability, and easy operation, avoids damage to sealing components, is suitable for various engine structures, and is convenient for collecting lubricating oil.
Smart Images
Figure CN223317927U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pollution control of aviation engine lubricating oil systems, and particularly relates to an oil drain device for aviation engine lubricating oil filters. Background Art
[0002] As one of the key systems in an aircraft engine, the lubricating oil system provides oil for lubrication and cooling of friction pairs such as main shaft bearings and transmission gears. The oil filter is used to filter impurities from the oil. An integrated drain device at the bottom of the oil filter allows for regular oil collection to inspect for metal shavings. Spectral analysis can also be performed to monitor abnormal wear in components such as transmission gears and main shaft bearings based on the composition of the metal shavings or the content of various metal elements in the oil spectrum.
[0003] Currently, extracting oil from the oil drain device at the bottom of the oil filter involves first removing the plug, then using a dedicated drain tool to lift the sealing valve inside the drain device, allowing the oil to flow out of the inner hole of the drain device housing. While this method is convenient, it requires the operator to continuously lift the sealing valve with a push rod, which can damage the surface of the sealing valve and other components, and in severe cases, cause the sealing valve to fail, posing significant risks and potential hazards. Furthermore, oil filters are typically arranged according to the shape of the engine. Due to the limited space in the engine structure, using a dedicated drain tool to drain the oil is inconvenient and makes it difficult to use a container to collect the oil at the drain port. Utility Model Content
[0004] The purpose of the utility model is to provide an oil drain device for an aviation engine lubricating oil filter.
[0005] The utility model has a simple structure and high reliability.
[0006] The technical solution of the utility model is: an oil drain device for an aircraft engine lubricating oil filter, comprising a drain screw seat with a cylindrical structure, an outer cylindrical surface of the drain screw seat being provided with a connecting thread near the upper end, an inner hole of the drain screw seat being threadedly connected to the drain screw, the drain screw being a T-shaped structure, an annular sealing belt being provided on the lower surface of the top boss, which can be sealed with the top surface of the drain screw seat to control the opening and closing of the oil drain device; the drain screw has a hollow flow channel in the interior, and two transverse flow channels are symmetrically provided on both sides of the two side walls near the top of the hollow flow channel, both of which are connected with the hollow flow channel; a sealing ring A is provided between the drain screw and the drain screw seat to realize sliding sealing.
[0007] In the aforementioned oil drain device for an aircraft engine oil filter, the connecting thread on the outer circumference of the oil drain screw seat near the upper end is a right-handed thread; the inner hole of the oil drain screw seat and the oil drain screw are connected with a left-handed thread.
[0008] In the aforementioned oil drain device for an aircraft engine lubricating oil filter, an arc-shaped protrusion structure is provided along the circumference of the top surface of the oil drain screw seat, and an annular sealing groove with a right-angled trapezoidal cross-section is provided on the lower side of the top of the oil drain screw, which is filled with vulcanized rubber to form an annular sealing belt. The annular sealing belt can contact the arc-shaped protrusion structure to form a sealing structure.
[0009] In the aforementioned oil drain device for an aircraft engine lubricating oil filter, a retaining ring is provided on the rod of the oil drain screw extending out of the oil drain screw seat; a limiting step is provided at the inner hole of the bottom end surface of the oil drain screw seat, and when the oil drain screw moves axially, the retaining ring moves into the limiting step to realize axial limitation.
[0010] In the aforementioned oil drain device for an aircraft engine lubricating oil filter, a wrench position is provided along the outer cylindrical surface at the bottom end of the oil drain screw.
[0011] In the aforementioned oil drain device for an aircraft engine oil filter, a sealing ring B is sleeved on the seat below the connecting thread near the upper end of the outer circumference of the oil drain screw seat.
[0012] The advantages of the utility model are:
[0013] (1) The oil discharge device has a simple structure and high reliability.
[0014] (2) The oil draining device is easy to operate and can be completed using common tools.
[0015] (3) The drain screw in the oil drain device can be connected to a hose to drain the released lubricating oil to another place to prevent the lubricating oil from overflowing onto the engine. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a structural diagram of the oil discharge device of the utility model;
[0017] Figure 2 This is a structural diagram of the oil drain screw seat of the utility model;
[0018] Figure 3 This is a structural diagram of the oil drain screw of the utility model;
[0019] Figure 4 This is a schematic structural diagram of the retaining ring of the present utility model;
[0020] Figure 5 This is a schematic diagram of the oil discharge device of the utility model being closed;
[0021] Figure 6 This is a schematic diagram of the oil discharge device of the utility model being opened;
[0022] Figure 7 This is a schematic diagram of the installation of the oil drain device of the utility model on the lubricating oil filter. DETAILED DESCRIPTION
[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.
[0024] Example 1. An oil drain device for an aircraft engine oil filter, see Figure 1-Figure 7 , including: oil drain screw 1, oil drain screw seat 2, sealing ring A3, sealing ring B4, retaining ring 5, including:
[0025] The oil drain screw 1 is a T-shaped structure, and an annular sealing groove with a right-angled trapezoidal cross-section is provided on the lower side of the top boss. The interior is filled with vulcanized rubber and seals with the oil drain screw seat 2 to control the opening and closing of the oil drain device; two horizontal flow channels are symmetrically provided on both sides of the oil drain screw 1, which are connected with the internal hollow flow channel; a sealing ring A3 is provided between the oil drain screw 1 and the oil drain screw seat 2 to realize sliding sealing; the oil drain screw 1 is provided with a left-handed thread on the outer cylindrical surface, which is threadedly connected to the oil drain screw seat 2; the oil drain screw 1 is provided with a retaining ring groove on the outer cylindrical surface, and a retaining ring 5 is placed thereon; the oil drain screw 1 is provided with a hexagonal prism on the outer cylindrical surface for a general tool hexagonal wrench to perform oil draining operations; the oil drain screw 1 is provided with a horizontal through-thread locking wire hole, which is prevented from loosening by a locking wire between the oil drain screw 1 and the oil drain screw seat 2.
[0026] The oil drain screw seat 2 is a cylindrical structure, and a hexagonal prism is provided at the bottom as a wrench position for a general tool hexagonal wrench to fix the oil drain device on the filter housing 6; the oil drain screw seat 2 is provided with a right-handed thread along the outer cylindrical surface, which is threadedly connected to the filter housing 6; the oil drain screw seat 2 is provided with a sealing ring B4 at the right-handed thread retreat groove, which is fixedly sealed with the filter housing 6; the top of the oil drain screw seat 2 is provided with an arc-shaped protrusion structure along the circumference, which realizes a sealing function with the vulcanized sealing ring belt of the oil drain screw 1; the inner hole of the oil drain screw seat 2 is provided with a smooth cylindrical sealing surface, which cooperates with the oil drain screw 1 to realize a sliding sealing function; the inner hole of the oil drain screw seat 2 is provided with a left-handed thread, which is threadedly connected to the oil drain screw 1; a limiting platform is provided at the bottom of the inner hole of the oil drain screw seat 2.
[0027] The retaining ring 5 is an annular structure with a rectangular cross section and an open structure; the retaining ring 5 is placed in the retaining ring groove of the oil drain screw 1.
[0028] Figure 6 The diagram shows the structure of the oil drain device in the closed state. The annular vulcanized rubber on the underside of the boss on the top of the oil drain screw 1 contacts and seals with the arc-shaped raised structure on the top of the oil drain screw seat 2, preventing the lubricating oil in the filter housing 6 from flowing out of the oil drain device.
[0029] Figure 7The diagram shows the oil drain device in the open state. The annular vulcanized rubber underside of the boss on the top of the oil drain screw 1 is separated from the arc-shaped protrusion on the top of the oil drain screw seat 2, and the lubricating oil in the filter housing 6 flows out through the internal flow channel of the oil drain screw 1 in the oil drain device.
[0030] Method of using the utility model:
[0031] Screw this device into the bottom of the filter housing 6. To check the lubricating oil quality or drain sediment, turn the hexagonal prism of the drain screw 1 counterclockwise, disengaging the cured sealing surface of the drain screw 1 from the raised structure on the top of the drain screw seat 2. The lubricating oil in the filter housing 6 then flows out through the internal flow channel of the drain screw 1 in the drain device and can be directed to another location via a hose. By adjusting the screwing depth of the drain screw 1 relative to the drain screw seat 2, the height of the cured sealing surface of the drain screw 1, and thus the amount of oil released, is controlled. The screwing depth of the drain screw 1 is limited by the retaining ring 5 and the step at the bottom of the drain screw seat 2.
[0032] When the draining is completed, the hexagonal prism of the drain screw 1 is turned clockwise so that the vulcanized sealing surface of the drain screw 1 contacts and seals with the raised structure on the top of the drain screw seat 2, and the drain device is closed.
Claims
1. An oil drain device for an aircraft engine oil filter, characterized in that: The invention comprises a drain screw seat (2) with a cylindrical structure, wherein the outer surface of the drain screw seat (2) is provided with a connecting thread near the upper end, and the inner hole of the drain screw seat (2) is threadedly connected with the drain screw (1), and the drain screw (1) is a T-shaped structure, and the lower surface of the top boss is provided with an annular sealing belt, which can be sealed with the top surface of the drain screw seat (2) to control the opening and closing of the drain device; the drain screw (1) has a hollow flow channel inside, and two transverse flow channels are symmetrically provided on both sides of the two side walls near the upper side of the hollow flow channel, both of which are connected with the hollow flow channel; a sealing ring A (3) is provided between the drain screw (1) and the drain screw seat (2) to achieve sliding sealing.
2. The oil drain device for an aircraft engine oil filter according to claim 1, characterized in that: The connecting thread on the outer cylindrical surface of the oil drain screw seat (2) near the upper end is a right-hand thread; the inner hole of the oil drain screw seat (2) and the oil drain screw (1) are connected by a left-hand thread.
3. The oil drain device for an aircraft engine oil filter according to claim 1, characterized in that: The top surface of the oil drain screw seat (2) is provided with an arc-shaped protrusion structure along the circumference, and the lower side of the top of the oil drain screw is provided with an annular sealing groove with a right-angled trapezoidal cross section, which is filled with vulcanized rubber to form an annular sealing belt, and the annular sealing belt can contact the arc-shaped protrusion structure to form a sealing structure.
4. The oil drain device for an aircraft engine oil filter according to claim 1, characterized in that: A retaining ring (5) is provided on the rod of the oil drain screw (1) extending out of the oil drain screw seat (2); a limiting step is provided at the inner hole of the bottom end surface of the oil drain screw seat (2); when the oil drain screw (1) moves in the axial direction, the retaining ring (5) moves into the limiting step to realize axial limiting.
5. The oil drain device for an aircraft engine oil filter according to claim 1, characterized in that: The bottom end of the oil drain screw (1) is provided with a wrench position along the outer cylindrical surface.
6. The oil drain device for an aircraft engine oil filter according to claim 1, characterized in that: A sealing ring B (4) is sleeved on the seat body below the connecting thread near the upper end of the outer circumference of the oil drain screw seat (2).