An aircraft hydraulic system air exclusion device

Abstract

The application belongs to the technical field of aircraft hydraulic system design, and particularly relates to an air removal device for an aircraft hydraulic system. The device comprises a lower shell, an oil inlet and an oil outlet are arranged on the lower shell, the lower shell is connected with a hydraulic system pipeline through the oil inlet and the oil outlet, an oil-gas separation mounting portion is arranged on the lower shell, an oil-gas separation cavity is formed in the oil-gas separation mounting portion, and the oil-gas separation cavity is communicated with the oil inlet; an upper shell is mounted on the lower shell, an oil outlet channel is formed between the upper shell and the oil-gas separation mounting portion, the oil outlet channel communicates the oil-gas separation cavity with the oil outlet, a through hole is arranged on the upper shell; an oil-gas separation membrane element is mounted in the oil-gas separation cavity; and an exhaust pipe is mounted on the oil-gas separation membrane element, and one end of the exhaust pipe extends out of the through hole of the upper shell.

Description

Technical Field

[0001] This application belongs to the field of aircraft hydraulic system design technology, and specifically relates to an air removal device for an aircraft hydraulic system. Background Technology

[0002] Aircraft hydraulic systems rely on hydraulic oil as a medium to perform work. The presence of gas in the hydraulic oil can affect efficiency, increase system heat generation, and cause cavitation in components, ultimately impacting the lifespan and reliability of the system and its components, and potentially leading to catastrophic events. Therefore, it is essential to remove as much gas as possible from the hydraulic system during operation. Gas in a hydraulic system exists in two states: free and dissolved. Free air can be vented through vent valves during ground maintenance, but dissolved air cannot be removed as it remains dissolved in the oil. However, when the system oil temperature decreases or there are sudden local pressure changes, air may seep out.

[0003] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0004] The purpose of this application is to provide an air purging device for an aircraft hydraulic system to solve at least one problem existing in the prior art.

[0005] The technical solution of this application is:

[0006] An air purging device for an aircraft hydraulic system, comprising:

[0007] The lower housing is provided with an oil inlet and an oil outlet. The lower housing is connected to the hydraulic system pipeline through the oil inlet and the oil outlet. The lower housing is provided with an oil-gas separation mounting part. The interior of the oil-gas separation mounting part forms an oil-gas separation chamber, which is connected to the oil inlet.

[0008] An upper housing is mounted on the lower housing, and an oil outlet channel is formed between the housing and the oil-gas separation mounting part. The oil outlet channel connects the oil-gas separation chamber with the oil outlet. A through hole is provided on the upper housing.

[0009] An oil-gas separation membrane element, wherein the oil-gas separation membrane element is installed in the oil-gas separation chamber;

[0010] An exhaust pipe is mounted on the oil-gas separation membrane element, and one end of the exhaust pipe extends out from the through hole of the upper housing.

[0011] In at least one embodiment of this application, the lower housing has a lower housing connecting portion, which is coaxially sleeved on the outside of the oil-gas separation mounting portion.

[0012] In at least one embodiment of this application, the upper housing is cylindrical and is detachably mounted on the connecting portion of the lower housing.

[0013] In at least one embodiment of this application, the upper housing and the lower housing are connected by a threaded connection.

[0014] In at least one embodiment of this application, a sealing ring is provided at the connection between the upper housing and the lower housing.

[0015] In at least one embodiment of this application, the cross-section of the oil-gas separation membrane element is U-shaped, including a first U-shaped pipe and a second U-shaped pipe separated by the oil-gas separation membrane, wherein the first U-shaped pipe is connected to the oil-gas separation chamber and the oil outlet channel respectively.

[0016] In at least one embodiment of this application, the oil-gas separation membrane element is replaced periodically according to a maintenance cycle.

[0017] In at least one embodiment of this application, the exhaust pipe is installed at the center of the oil-gas separation membrane element, and the exhaust passage inside the exhaust pipe is connected to the second U-shaped pipe.

[0018] In at least one embodiment of this application, the portion of the exhaust pipe connected to the oil-gas separation membrane element has an exhaust port.

[0019] In at least one embodiment of this application, multiple exhaust holes are evenly distributed on the exhaust pipe.

[0020] The invention has at least the following beneficial technical effects:

[0021] The air purging device for the aircraft hydraulic system disclosed in this application can remove dissolved air from the hydraulic system oil, reducing the dissolved air in the hydraulic system oil to an unsaturated state. This prevents air from seeping out during the operation of the hydraulic system due to temperature and pressure changes, thus avoiding damage to the hydraulic system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an air purging device for an aircraft hydraulic system according to one embodiment of this application;

[0023] Figure 2 This is a partial schematic diagram of an oil-gas separation membrane element according to one embodiment of this application;

[0024] Figure 3 This is a cross-sectional view of an oil-gas separation membrane element according to one embodiment of this application.

[0025] in:

[0026] 1-Oil inlet; 2-Lower housing; 3-Oil outlet; 4-Exhaust pipe; 5-Oil-gas separation membrane element; 6-Upper housing; 7-Air; 8-Hydraulic oil; 9-Oil-gas separation membrane. Detailed Implementation

[0027] 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. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0029] The following is in conjunction with the appendix Figures 1 to 3 This application will be described in further detail.

[0030] This application provides an air removal device for an aircraft hydraulic system, including: a lower housing 2, an upper housing 6, an oil-gas separation membrane element 5, and an exhaust pipe 4.

[0031] Specifically, such as Figure 1 As shown, the lower housing 2 is provided with an oil inlet 1 and an oil outlet 3. The lower housing 2 is connected to the hydraulic system pipeline through the oil inlet 1 and the oil outlet 3. The lower housing 2 is provided with an oil-gas separation mounting part, and the interior of the oil-gas separation mounting part forms an oil-gas separation chamber, which is connected to the oil inlet 1. The upper housing 6 is installed on the lower housing 2, and an oil outlet channel is formed between the housing 6 and the oil-gas separation mounting part. The oil outlet channel connects the oil-gas separation chamber to the oil outlet 3. A through hole is opened on the upper housing 6. An oil-gas separation membrane element 5 is installed in the oil-gas separation chamber. An exhaust pipe 4 is installed on the oil-gas separation membrane element 5, and one end of the exhaust pipe 4 extends out from the through hole of the upper housing 6.

[0032] In a preferred embodiment of this application, the lower housing 2 has a lower housing connecting portion, which is coaxially sleeved on the outside of the oil-gas separator mounting portion. The upper housing 6 is cylindrical and is detachably mounted on the lower housing connecting portion. The upper housing 6 and the lower housing connecting portion are connected by threads. Advantageously, in this embodiment, a sealing ring is provided at the connection between the upper housing 6 and the lower housing connecting portion.

[0033] In the preferred embodiment of this application, such as Figure 2-3 As shown, the cross-section of the oil-gas separation membrane element 5 is U-shaped, including a first U-shaped pipe and a second U-shaped pipe separated by the oil-gas separation membrane 9. The first U-shaped pipe is connected to the oil-gas separation chamber and the oil outlet channel, respectively. The exhaust pipe 4 is installed at the center of the oil-gas separation membrane element 5, and the exhaust channel inside the exhaust pipe 4 is connected to the second U-shaped pipe. The part of the exhaust pipe 4 that connects to the oil-gas separation membrane element 5 has an exhaust hole. Preferably, multiple exhaust holes are evenly distributed on the exhaust pipe 4. Hydraulic oil 8 entering through inlet 1 passes through the oil-gas separation chamber and enters the first U-shaped channel of oil-gas separation membrane element 5. The oil-gas separation membrane 9 is a polymer membrane whose function is to separate the air 7 from the hydraulic oil 8 when the hydraulic oil 8 containing dissolved air passes through the oil-gas separation membrane 9 through the leakage of the oil-gas separation membrane 9. The air 7 passes through the second U-shaped pipe, enters the exhaust pipe 4 through the exhaust hole, and is discharged into the atmosphere through the exhaust pipe 4. The hydraulic oil 8 in the first U-shaped channel that has expelled the air 7 passes through the oil outlet channel and flows into the hydraulic system pipeline through the oil outlet 3.

[0034] In a preferred embodiment of this application, the oil-gas separation membrane element 5 can be replaced periodically according to the maintenance cycle. When replacing it, the upper housing 6 is removed, the oil-gas separation membrane element 5 is replaced, and then the upper housing 6 is reinstalled.

[0035] The air purging device for the aircraft hydraulic system disclosed in this application comprises a lower housing 2 for fixing an oil-gas separation membrane element 5 and having a certain fixing strength. The oil inlet 1 in the lower housing 2 is connected to the aircraft hydraulic system pipeline. Hydraulic oil 8 containing dissolved air 7 enters the air purging device through the oil inlet 1. The oil-gas separation membrane element 5 is installed in the oil-gas separation chamber of the lower housing 2. The oil-gas separation membrane element 5 purifies the dissolved air 7 in the hydraulic oil 8 through permeation. The purged air 7 is discharged from the air purging device through the exhaust pipe 4 and released into the atmosphere. The oil outlet 3 in the lower housing 2 is connected to the hydraulic system pipeline. The hydraulic oil 8 that has purged the air 7 flows back to the hydraulic system through the oil outlet 3 after passing through the oil outlet channel. An upper housing 6 is connected and fixed to the lower housing 2, encapsulating the entire device. By removing the upper housing 6, the oil-gas separation membrane element 5 can be replaced periodically.

[0036] The air purging device for the aircraft hydraulic system disclosed in this application can remove air dissolved in the hydraulic fluid of the aircraft hydraulic system, preventing air from seeping out during the operation of the hydraulic system due to temperature and pressure changes, which could damage the hydraulic system.

[0037] 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. An aircraft hydraulic system air removal device, comprising: The utility model relates to a kind of oil-gas separation devices, including: Lower shell (2), oil inlet (1) and oil outlet (3) are provided on the lower shell (2), the lower shell (2) is connected with hydraulic system pipeline by the oil inlet (1) and the oil outlet (3), oil-gas separation installation part is provided on the lower shell (2), oil-gas separation cavity is formed inside the oil-gas separation installation part, and the oil-gas separation cavity is communicated with the oil inlet (1); Upper shell (6), the upper shell (6) is installed on the lower shell (2), and the oil outlet channel is formed between the upper shell (6) and the oil-gas separation installation part, the oil outlet channel is communicated with the oil-gas separation cavity and the oil outlet (3), and the through hole is set in the upper shell (6); Oil-gas separation membrane element (5), the oil-gas separation membrane element (5) is installed in the oil-gas separation cavity; Exhaust pipe (4), the exhaust pipe (4) is installed on the oil-gas separation membrane element (5), and one end of the exhaust pipe (4) is stretched out by the through hole of the upper shell (6); The cross section of the oil-gas separation membrane element (5) is a back-shaped, including first back-shaped pipeline and second back-shaped pipeline separated by oil-gas separation membrane (9), and the first back-shaped pipeline is communicated with the oil-gas separation cavity and the oil outlet channel respectively.

2. An aircraft hydraulic system air exclusion device according to claim 1, wherein, The lower shell (2) has lower shell connecting part, and the lower shell connecting part is coaxially sleeved outside the oil-gas separation installation part.

3. The aircraft hydraulic system air exclusion apparatus of claim 1, wherein, The upper shell (6) is cylindrical, and is installed on the lower shell connecting part by detachable mounting.

4. An aircraft hydraulic system air exclusion device according to claim 3, wherein, The upper shell (6) is connected with the lower shell connecting part by screw thread.

5. An aircraft hydraulic system air exclusion device according to claim 4, wherein, Sealing ring is provided at the connection of the upper shell (6) and the lower shell connecting part.

6. The aircraft hydraulic system air exclusion apparatus of claim 1, wherein, The oil-gas separation membrane element (5) is regularly replaced according to maintenance cycle.

7. An aircraft hydraulic system air exclusion device as defined in claim 6, wherein, The exhaust pipe (4) is installed at the center position of the oil-gas separation membrane element (5), and the exhaust passage inside the exhaust pipe (4) is communicated with the second back-shaped pipeline.

8. An aircraft hydraulic system air exclusion device according to claim 7, wherein, The exhaust pipe (4) is provided with exhaust hole at the part connected with the oil-gas separation membrane element (5).

9. An aircraft hydraulic system air exclusion device as defined in claim 8, wherein, Multiple exhaust holes are evenly provided on the exhaust pipe (4).

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