Oil drainage method and valve for aviation lubricating oil tank
By designing an aviation lubricating oil tank drain valve with a T-shaped valve core screw, the problems of slow gravity drain speed and volume change were solved, achieving rapid and pollution-free oil level calibration.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-14
- Publication Date
- 2026-04-10
AI Technical Summary
In the existing technology, the gravity draining speed of aviation oil tanks is slow and the draining process will contaminate the oil. In addition, the connection of ordinary valves will change the volume of the oil tank, resulting in inaccurate oil level calibration.
An oil drain valve for an aviation oil tank was designed. It uses a T-shaped valve core screw to seal with the drain nozzle. By rotating the handle, the valve core and the drain nozzle sealing surfaces are controlled to fit or separate, so as to achieve rapid oil draining without changing the volume of the oil tank.
It enables rapid oil draining, avoids lubricating oil contamination, ensures accurate oil level calibration, and does not affect the volume of the lubricating oil tank.
Smart Images
Figure CN121828599A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method and valve for draining oil from an aviation oil tank, belonging to the field of aviation engine oil tank design technology. Background Technology
[0002] After performing an oil level calibration test on an aviation oil tank, the oil needs to be drained. Relying on gravity for automatic draining is time-consuming and inefficient. Furthermore, the automatically drained oil is exposed to air, leading to contamination and reduced oil lifespan. If a standard valve is used to connect to the oil tank, and then a suction pump is connected via a pipe to draw the oil into a sealed oil recovery tank, the following problem arises: when using a standard valve, there is an unavoidable distance between the valve core and the drain nozzle of the aviation oil tank. This means the internal volume of the standard valve alters the volume of the aviation oil tank, resulting in inaccurate oil level calibration tests. Therefore, a draining method and valve are needed that can drain the aviation oil tank without changing its internal volume. Summary of the Invention
[0003] The present invention aims to provide a method and valve for draining oil from an aviation oil tank, which is faster than gravity draining and does not affect the internal volume of the oil tank.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: An aviation oil tank drain valve, comprising: The valve cavity is a hollow shell with an oil inlet, an oil outlet, and a threaded hole respectively opened on three different surfaces, wherein the oil inlet and the threaded hole are coaxial. The first external pipe port is installed at the oil inlet of the valve cavity. The inner wall of the first external pipe port has internal threads. The first external pipe port is used to connect with the oil drain pipe of the lubricating oil tank. The second external pipe port is installed at the oil outlet of the valve cavity; The valve core screw is T-shaped and includes a valve core and a screw connected vertically. The valve core is located in the cavity of the valve body, and the end face of the valve core forms a sealing surface. The screw is installed in the threaded hole of the valve body and a portion extends to the outside of the valve body. A handle, which is connected to the portion of the screw located outside the valve cavity.
[0005] Alternatively, the second external pipe port is connected to the oil outlet of the valve cavity via a valve cavity cover.
[0006] As an option: The valve cavity cover is welded to the valve cavity or connected by a screw; The second external pipe is welded to or threaded to the valve cavity cover.
[0007] Alternatively, the first external pipe port is connected to the oil inlet of the valve cavity by thread or by welding.
[0008] Alternatively, the handle is welded to the screw or connected by a thread.
[0009] A method for draining oil from an aviation oil tank includes: A valve core is installed at the outlet end face of the drain nozzle of the aviation oil tank. When the valve core is away from the outlet end face of the drain nozzle, the lubricating oil flows through the drain nozzle into a tank that serves as a temporary storage tank for lubricating oil. The lubricating oil in the tank is then pumped out by an oil suction machine. When the aviation oil tank has finished draining, the valve core moves to fit against the outlet end face of the drain nozzle to form a sealing surface, thereby blocking the drain nozzle.
[0010] Furthermore, the method for draining the aviation oil tank adopts the aforementioned aviation oil tank drain valve, wherein: The first external pipe is connected to the drain nozzle of the aviation lubricating oil tank. By rotating the handle, the valve core of the valve core screw is driven away from the outlet end face of the drain nozzle or to form a sealing surface by adhering to the outlet end face of the drain nozzle. The second external pipe is connected to the oil suction machine; The valve cavity serves as a temporary storage tank for lubricating oil.
[0011] Compared with existing technologies, this invention addresses the problem that directly connecting a conventional valve to the drain nozzle of an aviation oil tank after oil level calibration tests alters the tank's volume. It proposes a draining method and valve where the valve core end face of the valve core screw is tightly sealed to the drain nozzle end face. No additional structure extends into the tank, thus not reducing its volume, nor creating space outside the drain nozzle, and therefore not increasing the tank's volume. Attached Figure Description
[0012] Figure 1 This is an assembly diagram of the aviation lubricating oil tank drain valve in this invention; Figure 2 This is a schematic diagram of the drain nozzle of an aviation lubricating oil tank; Figure 3 This is a schematic diagram of the aviation lubricating oil tank drain valve of the present invention in the closed state; Figure 4 This is a schematic diagram of the aviation lubricating oil tank drain valve of the present invention in the open state; In the diagram: 1. Valve cavity, 2. First external pipe port, 3. Second external pipe port, 4. Valve core screw, 5. Handle, 6. Valve cavity cover, 7. Drain nozzle. Detailed Implementation
[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.
[0014] like Figure 1 , Figure 3 and Figure 4 As shown, this invention relates to an aviation lubricating oil tank drain valve, which mainly consists of six parts: valve cavity 1, first external pipe port 2, second external pipe port 3, valve core screw 4, handle 5, and valve cavity cover 6. These parts are assembled together to form a valve. The valve is opened and closed by controlling the extension and retraction of the valve core screw 4.
[0015] Reference Figure 1 As shown, the first external pipe port 2 and the valve cavity 1 are connected by welding or thread. Reference Figure 1 As shown, the valve cavity cover 6 and the valve cavity 1 are connected by welding or fixed by screws; Reference Figure 1 As shown, the second external pipe port 3 and the valve cavity cover 6 are connected by welding or threading. Reference Figure 1 , Figure 3 , Figure 4 As shown, the valve core screw 4 is inserted into the threaded hole of the valve cavity 1 through the first external pipe port 2. The valve core screw 4 is welded or threaded to the handle 5. By rotating the valve core screw 4 through the handle 5, the valve core screw 4 can be extended and retracted, thereby opening and closing the valve. Reference Figure 2 , Figure 3 As shown, the drain nozzle 7 of an aviation lubricating oil tank is installed into the first external pipe port 2 of the drain valve, and the two are connected by threads. Reference Figure 3 As shown, the rotating valve core screw 4 extends into the valve cavity 1, so that the valve core end face of the valve core screw 4 fits against the outlet end face of the drain nozzle 7, thereby closing the valve. The outer diameter of the valve core of the valve core screw 4 is sufficient to seal the outlet end face of the drain nozzle 7. Reference Figure 4 As shown, rotating the valve core screw 4 out of the valve cavity 1 causes the valve core end face of the valve core screw 4 to separate from the outlet end face of the drain nozzle 7, thereby opening the valve.
[0016] When draining oil from an aviation oil tank, follow these steps: The first external pipe port 2 is connected to the external thread of the drain pipe 7 of the aviation lubricating oil tank via an internal thread; The second external pipe port 3 is connected to the oil suction machine; Valve cavity 1 serves as a temporary storage tank for lubricating oil; When starting to drain oil, turn on the oil suction machine and rotate the handle 5 to move the valve core end face of the valve core screw 4 away from the outlet end face of the oil drain nozzle 7. When draining oil is complete, rotate the handle 5 in the opposite direction to make the valve core end face of the valve core screw 4 fit tightly against the outlet end face of the oil drain nozzle 7 to complete the seal.
[0017] Those skilled in the art can make various adjustments to this application based on the actual circumstances. The general principles defined in this application can be implemented in other embodiments without departing from their connotations. Therefore, this application is not limited to the structure shown in the specific embodiments, but is to be accorded the widest scope consistent with the principles and features set forth in the claims of this application.
Claims
1. An oil drain valve for an aviation lubricating oil tank, characterized in that, include: Valve cavity (1), the valve cavity (1) is a hollow shell, and an oil inlet, an oil outlet and a threaded hole are respectively opened on three different surfaces of the hollow shell, wherein the oil inlet and the threaded hole are coaxial; The first external pipe port (2) is assembled at the oil inlet of the valve cavity (1). The inner wall of the first external pipe port (2) has internal threads. The first external pipe port (2) is used to connect with the oil drain nozzle (7) of the lubricating oil tank. The second external pipe port (3) is installed at the oil outlet of the valve cavity (1); The valve core screw (4) is T-shaped and includes a valve core and a screw connected vertically. The valve core is located in the cavity of the valve body (1). The end face of the valve core forms a sealing surface. The screw is installed in the threaded hole of the valve body (1) and a part of it extends to the outside of the valve body (1). Handle (5), which is connected to the part of the screw located outside the valve cavity (1).
2. The aviation lubricating oil tank drain valve according to claim 1, characterized in that: The second external pipe port (3) is connected to the oil outlet of the valve cavity (1) through the valve cavity cover (6).
3. The aviation lubricating oil tank drain valve according to claim 2, characterized in that: The valve cavity cover (6) is welded to the valve cavity (1) or connected by a screw; The second external pipe port (3) is welded to the valve cavity cover (6) or connected by threads.
4. The aviation lubricating oil tank drain valve according to claim 1, characterized in that: The first external pipe port (2) is connected to the oil inlet of the valve cavity (1) by thread or by welding.
5. The aviation lubricating oil tank drain valve according to claim 1, characterized in that: The handle (5) is welded to the screw or connected by a thread.
6. A method for draining oil from an aviation lubricating oil tank, characterized in that, include: A valve core is installed at the outlet end face of the drain nozzle (7) of the aviation lubricating oil tank. When the valve core is far away from the outlet end face of the drain nozzle (7), the lubricating oil flows through the drain nozzle (7) into a tank that serves as a temporary storage tank for lubricating oil. The lubricating oil in the tank is then pumped away by an oil suction machine. When the aviation lubricating oil tank has finished draining, the valve core moves to fit against the outlet end face of the drain nozzle (7) to form a sealing surface, thereby blocking the drain nozzle (7).
7. The method for draining oil from an aviation lubricating oil tank according to claim 6, characterized in that: The aviation lubricating oil tank drain valve according to claim 1 is used, wherein: The first external pipe port (2) is connected to the drain pipe (7) of the aviation lubricating oil tank. By rotating the handle (5), the valve core of the valve core screw (4) is driven away from the outlet end face of the drain pipe (7) or attached to the outlet end face of the drain pipe (7) to form a sealing surface. The second external pipe (3) is connected to the oil suction machine; The valve cavity (1) serves as a temporary storage tank for lubricating oil.