A fuel oil and lubricating oil filtering device

Abstract

A refueling and return oil filtration device includes an upper cover and a lower housing, which are sealed together as a whole. The lower housing has a chamber. The upper cover has a return oil channel, a safety valve channel, a refueling channel, and an intermediate channel. One end of the return oil channel is connected to an external working fluid tank, and the other end is connected to the chamber. The safety valve channel and the refueling channel are respectively connected to one end of the intermediate channel. A safety valve is installed in the safety valve channel, and the safety valve can block the connection between the safety valve channel and the lower housing chamber. A refueling filter element is installed in the refueling channel. The lower housing has a return oil filter element and an oil outlet pipe. The return oil filter element is sleeved outside the refueling filter element. The top of the return oil filter element is in sealing contact with the bottom of the upper cover, and the bottom of the return oil filter element is in contact with the bottom surface of the lower housing through a wave spring. The oil outlet pipe is located inside the return oil filter element and is sealed through the lower housing. This device can reduce the burden on the aircraft hydraulic system.

Description

Technical Field

[0001] This invention relates to the field of aircraft filter technology, and in particular to a refueling return oil filtration device. Background Technology

[0002] As is well known, filters are the main components of fluid contamination control. They are used to filter out contaminants generated by wear and corrosion of moving parts or introduced into the system from the outside, prevent high-precision mating parts from jamming or pipeline blockage from causing system performance degradation or loss of function, and improve system reliability.

[0003] Currently, the requirements for contamination control of aircraft hydraulic system fluids are becoming increasingly stringent, but the solution is simply to continuously increase the variety of filtration devices. This inevitably leads to a series of problems such as large filter space occupancy, increased weight, and poor maintainability, thereby increasing the burden on the aircraft hydraulic system.

[0004] Chinese patent (CN101530688B) discloses a cartridge filter for aircraft. It uses a single internal thread design to achieve the function of fixing and retaining the component, while also accommodating the filter, thereby simplifying the design of the hydraulic module. However, this filter does not help to reduce the need to reduce contamination in the aircraft hydraulic system, leaving the aircraft hydraulic system with problems such as large weight and poor maintainability.

[0005] In conclusion, there is a current market need for a filtration device that can reduce the burden on aircraft hydraulic systems. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention discloses a refueling return oil filtration device.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] A refueling return filter device includes an upper cover and a lower housing, wherein the upper cover and the lower housing are correspondingly and sealed together as a whole, and the lower housing is provided with a chamber.

[0009] The upper cover is provided with an oil return channel, a safety valve channel, a refueling channel and an intermediate channel. One end of the oil return channel is connected to an external working fluid tank, and the other end of the oil return channel is connected to a corresponding chamber. The safety valve channel and the refueling channel are respectively connected to one end of the intermediate channel. A safety valve is installed in the safety valve channel, and the safety valve can block the connection between the safety valve channel and the lower housing chamber. A refueling filter element is installed in the refueling channel.

[0010] The lower housing is equipped with an oil return filter and an oil outlet pipe. The oil return filter is sleeved outside the oil filling filter. The top of the oil return filter is in sealing contact with the bottom of the upper cover. The bottom of the oil return filter is in corresponding contact with the bottom surface of the lower housing through a wave spring. The oil outlet pipe is located inside the oil return filter and is correspondingly sealed through the lower housing.

[0011] Preferably, the safety valve includes a valve, a valve plug, and a spring. The valve is located at the tail end of the safety valve channel, corresponding to the connection between the safety valve channel and the lower housing chamber. The valve plug is fitted outside the valve and is fixedly installed inside the upper cover. Both the valve plug and the valve are hollow cavities, and springs are provided inside the hollow cavities to correspond to and abut against both the valve plug and the valve.

[0012] Preferably, the upper cover is provided with a threaded cap for sealing the oil filter element.

[0013] Preferably, the upper cover is provided with a test interface, one end of which is connected to a corresponding chamber inside the lower housing.

[0014] Preferably, the oil return filter element includes an upper end cover, an outer frame, a filter screen, and a lower end cover. The upper end cover and the lower end cover are connected by the outer frame, the filter screen is provided on the outer frame, the upper end cover and the inner bottom surface of the upper cover are in sealing contact, and the lower end cover is connected to the inner bottom surface of the lower housing by a wave spring.

[0015] By employing the technical solution described above, the present invention has the following beneficial effects:

[0016] This invention discloses a refueling return oil filtration device, which enables the aircraft hydraulic system to achieve dual filtration of system oil and replenishment oil by setting up a return oil filter element and a return oil channel, as well as a refueling filter element and a refueling channel. It can filter both system oil and replenishment oil, and also has a return oil bypass function, which improves the integration of the filter, effectively reduces the number of filtration devices in the system, and thus reduces the burden on the hydraulic system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of one structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the return oil filter element;

[0019] Figure 3 This is a schematic diagram of a wave spring.

[0020] In the diagram: 1. Top cover; 2. Lower housing; 3. Oil return channel; 4. Safety valve channel; 5. Oil filling channel; 6. Intermediate channel; 7. Oil filling filter element; 8. Safety valve; 801. Valve; 802. Valve plug; 803. Spring; 9. Oil return filter element; 901. Top end cover; 902. Outer frame; 903. Filter screen; 904. Bottom end cover; 10. Oil outlet pipe; 11. Wave spring; 12. Threaded cap; 13. Test interface. Detailed Implementation

[0021] The technical solution of the present invention will now be described with reference to the accompanying drawings of the embodiments of the present invention. In the description, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicating directions or positional relationships, are only used to correspond to the accompanying drawings of the present invention for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0022] Combined with appendix Figure 1-3 The refueling return oil filtration device includes an upper cover 1 and a lower housing 2. The upper cover 1 and the lower housing 2 are correspondingly and sealed together as a whole, and the lower housing 2 is provided with a chamber.

[0023] The upper cover 1 is provided with an oil return channel 3, a safety valve channel 4, a refueling channel 5, and an intermediate channel 6. One end of the oil return channel 3 is connected to an external working fluid tank, and the other end of the oil return channel 3 is connected to a corresponding chamber. The oil return channel 3 is used for the entry of system oil. The safety valve channel 4 and the refueling channel 5 are respectively connected to one end of the intermediate channel 6. A safety valve 8 is installed in the safety valve channel 4, and the safety valve 8 can block the connection between the safety valve channel 4 and the lower housing 2 chamber. As needed, the safety valve 8 includes a valve 801, a valve plug 802, and a spring 803. The valve 801 is located at the tail end of the safety valve channel 4, correspondingly blocking the connection between the safety valve channel 4 and the lower housing 2 chamber. The valve 801 is fitted with a sleeve. A valve plug 802 is provided, which is fixedly installed inside the upper cover 1. Both the valve plug 802 and the valve 801 are hollow cavities. Springs 803 are provided inside the hollow cavities, corresponding to and abutting against both the valve plug 802 and the valve 801. Under normal circumstances, the force of the springs 803 can keep the valve 801 blocked. When the oil pressure in the cavity reaches the limit value, the valve 801 will be pushed up and move upward along the hollow cavity inside the valve plug 802. An oil filling filter element 7 is provided in the oil filling channel 5. The oil filling channel 5 is used to replenish the system oil. In addition, the upper cover 1 is provided with a threaded cap 12 for sealing the oil filling filter element 7. The threaded cap 12 can improve the sealing performance of this filtration device, thereby preventing oil leakage.

[0024] The lower housing 2 contains a return oil filter element 9 and an oil outlet pipe 10. The return oil filter element 9 is sleeved outside the refueling filter element 7. The top of the return oil filter element 9 is in sealing contact with the bottom of the upper cover 1, and the bottom of the return oil filter element 9 is in contact with the inner bottom surface of the lower housing 2 via a wave spring 11. The wave spring 11 can be used to adjust the installation gap between parts, facilitating the positioning of the return oil filter element 9, and at the same time making the overall filtration device more resistant to mechanical environments such as vibration, impact, and acceleration. The oil outlet pipe 10 is located at the return oil... Inside the filter element 9, and correspondingly sealing through the lower housing 2, the return oil filter element 9 is used to filter the system oil entering from the return oil channel 3; the return oil filter element 9 includes an upper end cover 901, an outer frame 902, a filter screen 903 and a lower end cover 904, wherein the upper end cover 901 and the lower end cover 904 are connected by the outer frame 902, the filter screen 903 is provided on the outer frame 902, the upper end cover 901 is in sealing contact with the inner bottom surface of the upper cover 1, and the lower end cover 904 is connected to the inner bottom surface of the lower housing 2 by a wave spring 11;

[0025] In addition, when the device is working normally, the system oil enters through the return oil channel 3, is filtered by the return oil filter element 9, and then enters the oil tank through the oil outlet pipe 10. If the return oil filter element 9 becomes clogged, the oil pressure in the chamber will increase. When the pressure reaches a certain value, the safety valve 8 will automatically open. The safety valve channel 4 is connected to the intermediate channel 6. At this time, the system oil will flow along the chamber, the safety valve channel 4, and the intermediate channel 6, and then flow out through the oil outlet pipe 10 after being filtered by the oil filling filter element 9, thereby extending the working time of the filtration device. In particular, the opening pressure of the safety valve 8 is 0.15MPa to 0.3MPa.

[0026] In addition, the upper cover 1 is provided with a test interface 13, one end of which is connected to the chamber inside the lower housing 2. The test interface 13 can be used to detect whether the working status of each filter element is normal.

[0027] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

Claims

1. A refueling return oil filtration device, characterized in that: It includes an upper cover (1) and a lower shell (2), wherein the upper cover (1) and the lower shell (2) are sealed together as a whole, and the lower shell (2) has a cavity inside; The upper cover (1) is provided with an oil return channel (3), a safety valve channel (4), a refueling channel (5) and an intermediate channel (6). One end of the oil return channel (3) is connected to an external working fluid tank, and the other end of the oil return channel (3) is connected to the corresponding chamber. The safety valve channel (4) and the refueling channel (5) are respectively connected to one end of the intermediate channel (6). A safety valve (8) is provided in the safety valve channel (4), and the safety valve (8) can block the connection between the safety valve channel (4) and the lower housing (2) chamber. A refueling filter element (7) is provided in the refueling channel (5). The lower housing (2) is provided with an oil return filter (9) and an oil outlet pipe (10). The oil return filter (9) is sleeved outside the oil filling filter (7). The top of the oil return filter (9) is in sealing contact with the bottom of the upper cover (1). The bottom of the oil return filter (9) is in corresponding contact with the bottom surface of the lower housing (2) through a wave spring (11). The oil outlet pipe (10) is located inside the oil return filter (9) and is correspondingly sealed through the lower housing (2). The safety valve (8) includes a valve (801), a valve plug (802), and a spring (803). The valve (801) is located at the tail end of the safety valve channel (4) and corresponds to blocking the connection between the safety valve channel (4) and the lower housing (2) chamber. The valve plug (802) is fitted on the outside of the valve (801). The valve plug (802) is fixedly installed inside the upper cover (1). Both the valve plug (802) and the valve (801) are hollow cavities. Springs (803) are provided inside the hollow cavities that correspond to and abut against both the valve plug (802) and the valve (801). The upper cover (1) is provided with a threaded cap (12) for sealing the oil filter element (7). The return oil filter element (9) includes an upper end cover (901), an outer frame (902), a filter screen (903), and a lower end cover (904). The upper end cover (901) and the lower end cover (904) are connected through the outer frame (902). The filter screen (903) is provided on the outer frame (902). The upper end cover (901) is in sealing contact with the inner bottom surface of the upper cover (1). The lower end cover (904) is connected to the inner bottom surface of the lower housing (2) through a wave spring (11).

2. The refueling return oil filtration device as described in claim 1, characterized in that: The upper cover (1) is provided with a test interface (13), one end of which is connected to the corresponding chamber in the lower shell (2).

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