Water and oil centralized discharge structure for an auxiliary power unit

Abstract

The application relates to the technical field of auxiliary power units of an aero-engine, and particularly discloses a water and oil centralized discharge structure for an auxiliary power unit, which comprises a water discharge interface, an oil discharge interface, an anti-back-suction valve and a water and oil centralized discharge interface, the input end of the anti-back-suction valve is communicated with the water discharge interface, the output end of the anti-back-suction valve is communicated with the water and oil centralized discharge interface, and the oil discharge interface is communicated with the water and oil centralized discharge interface. The discharge structure prevents low negative pressure back suction, is smooth in discharge, simple in structure, simple in processing technology, reliable and practical, and is mainly suitable for discharging fuel, lubricating oil and water of a small or medium-sized auxiliary power unit of an aero-engine, and effectively solves the problems of poor assembly of the current discharge structure of the auxiliary power unit, the incapability of meeting the future aircraft weight reduction requirement and the stealth requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of auxiliary power unit of an aero-engine, and particularly relates to a water and oil centralized discharge structure for an auxiliary power unit. BACKGROUND

[0002] The discharge structure is an essential functional structure of the auxiliary power unit of an aero-engine. The auxiliary power unit of an aero-engine needs to discharge fuel oil, lubricating oil and water. The fuel oil to be discharged mainly comes from fuel regulating seal oil leakage and excess fuel oil in the combustion chamber, and the lubricating oil to be discharged mainly comes from lubricating oil seal oil leakage. The water discharge of the auxiliary power unit is mainly for the water discharge in the inlet casing. Due to the consideration of the stealth requirement of some aircraft, the inlet is mainly directed to the back of the aircraft. When the auxiliary power unit is not working, rainwater is accumulated in the inlet casing. The existing discharge structure of the auxiliary power unit of an aero-engine discharges the fuel oil, lubricating oil and water through separate interfaces to the outside of the aircraft. Although the structure is simple and convenient for processing, it causes the following problems: the number of connection interfaces with the aircraft is large, the assembly performance is poor, the number of discharge ports is large, and the stealth performance of the aircraft is reduced. With the improvement of the stealth performance requirement and the assembly performance requirement of the aircraft, the existing mode can no longer meet the requirements of the aircraft.

[0003] The existing discharge structure of the auxiliary power unit is designed in the mode of separate discharge of fuel oil, lubricating oil and water (for example, as shown in Figure 1 ), which increases the number of interfaces, reduces the assembly performance of the product on the aircraft, increases the number of discharge pipelines of the aircraft, reduces the utilization rate of the discharge pipelines, increases the weight of the aircraft, and increases the discharge ports of the aircraft, thereby reducing the stealth performance of the aircraft. SUMMARY

[0004] The present application relates to a kind of auxiliary power unit water, oil centralized discharge structure for preventing low negative pressure reverse suction, discharge fluent, simple structure, simple processing technology, reliable and practical, mainly suitable for small and medium-sized aero-engine auxiliary power unit fuel oil, lubricating oil and water discharge, effectively solve the assembly performance of the current auxiliary power unit discharge structure is poor, cannot meet the future aircraft weight reduction requirement, stealth requirement.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A kind of water, oil centralized discharge structure for auxiliary power unit, including drainage interface, oil discharge interface, anti-suction valve and water, oil centralized discharge interface, the input end of the anti-suction valve is communicated with drainage interface, the output end of the anti-suction valve is communicated with water, oil centralized discharge interface, the oil discharge interface is communicated with water, oil centralized discharge interface. Drainage interface, oil discharge interface are used to connect with the drainage end and the oil discharge end of auxiliary power unit respectively.

[0007] Further, in order to facilitate the manufacture of the entire discharge structure, the reliable and practical structure is simple, the anti-suction valve comprises a valve body, a valve core and a stop pin, the valve body has a channel, one end of the channel is provided with a valve port, the valve port is communicated with a drainage interface, the valve core is slidably connected in the channel and can be used to block the valve port, the stop pin is arranged at the other end of the channel and is used to limit the valve core in the channel, and the other end of the channel is communicated with a water and oil centralized discharge interface.

[0008] In a further scheme, the anti-suction valve further comprises an integrated piece, and the valve body is detachably connected in the integrated piece. In this way, all the discharge ports of the auxiliary power device can be facilitated.

[0009] In a further scheme, the valve port is a round port, and the valve core is a round ball. In this way, the valve core has a simple processing technology, smooth discharge and high service life.

[0010] In a further scheme, the round ball is a steel ball. In this way, the valve port can be stably closed.

[0011] In a further scheme, the valve port is a rectangular port, one end of the valve core can match and block the rectangular port, and the other end can match and slide with the channel.

[0012] In a further scheme, a spring is elastically connected between the valve core and the valve port.

[0013] In a further scheme, the minimum compression spring force of the spring is smaller than the negative pressure of the drainage interface.

[0014] In a further scheme, the number of oil discharge interfaces is two, one oil discharge interface is used for discharging lubricating oil, and the other oil discharge interface is used for discharging fuel oil.

[0015] In a further scheme, the anti-suction valve is two, and is respectively communicated between the two oil discharge interfaces and the drainage interface.

[0016] The beneficial effects of the present application are as follows:

[0017] 1. The present application reduces the discharge interface of the aircraft, improves the assembly of the product on the aircraft, improves the utilization rate of the aircraft discharge pipeline, reduces the weight of the aircraft pipeline, reduces the external discharge port of the aircraft, and improves the stealth performance of the aircraft. At the same time, the design and invention have simple structure and good processing technology. The design and invention connect all the discharge pipelines together, constrain each other between the discharge pipelines, reduce the number of parts required for fixing the product pipeline, and reduce the weight of the product.

[0018] 2. The present application can prevent the discharged fuel and lubricating oil from passing through the drainage port due to the negative pressure generated by the auxiliary power device of the aero-engine at the drainage interface during centralized discharge.

[0019] 3、The anti-suction valve of the application has simple structure, simple processing technology, and is reliable and practical, and can be completely opened under the gravity of water, and the discharge is smooth. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a schematic diagram of the discharge structure of an auxiliary power device of an aero-engine in the prior art;

[0022] Figure 2 is a connection schematic diagram of a water and oil centralized discharge structure for an auxiliary power device in an embodiment of the present application;

[0023] Figure 3 is Figure 2 is a partial cross-sectional view along A-A of the rectangular dashed box at B in

[0024] Figure 4 is a structure schematic diagram of an anti-suction valve connected by a spring in an embodiment of the present application.

[0025] In the figure: 1, water discharge interface; 2, oil discharge interface; 3, anti-suction valve; 31, valve body; 310, passage; 311, valve port; 32, valve core; 33, stop pin; 34, integrated piece; 35, spring; 4, water and oil centralized discharge interface. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0027] As Figure 2 shown, a water and oil centralized discharge structure for an auxiliary power device includes a water discharge interface 1, an oil discharge interface 2, an anti-suction valve 3, and a water and oil centralized discharge interface 4. The input end of the anti-suction valve 3 is in communication with the water discharge interface 1, the output end of the anti-suction valve 3 is in communication with the water and oil centralized discharge interface 4, and the oil discharge interface 2 is in communication with the water and oil centralized discharge interface 4.

[0028] The working principle is that the exhaust structure connects all the exhaust ports of the auxiliary power device together to form a centralized exhaust port. When the auxiliary power device works, the anti-suction valve 3 is used to prevent the exhaust fuel and lubricating oil from entering the auxiliary power device through the drain port due to the negative pressure generated at the drain interface 1 end of the auxiliary power device. When the oil is drained, the negative pressure causes the passage between the anti-suction valve 3 and the drain interface 1 to close, and the oil cannot enter the auxiliary power device at the drain interface. The oil is discharged through the water and oil centralized exhaust interface 4 connected at the oil drain interface 2, so as not to enter the auxiliary power device. When the water is drained, the anti-suction valve 3 is connected to the water and oil centralized exhaust interface 4 under the drain pressure, and the water is discharged from the water and oil centralized exhaust interface 4. In this way, water and oil can be discharged through the water and oil centralized exhaust interface 4, thereby reducing the number of interfaces, improving the assembly of the product on the airplane, reducing the airplane exhaust pipeline, increasing the utilization rate of the exhaust pipeline, and reducing the weight of the airplane. The number of exhaust ports of the airplane is reduced, and the stealth performance of the airplane is improved.

[0029] Those skilled in the art should know that during installation, the positions of the above-mentioned drain interface 1, oil drain interface 2, and water and oil centralized exhaust interface 4 at the anti-suction valve 3 or the installation position of the entire exhaust structure can be reasonably set according to the positions of the auxiliary power device and other parts. These conventional technical designs should also be included in the disclosure of the application of the present application.

[0030] According to the above working principle, some preferred embodiments or implementation structures are provided, such as Figure 3 As shown in the figure, the anti-suction valve 3 includes a valve body 31, a valve core 32, and a stop pin 33. The valve body 31 has a passage 310, one end of the passage 310 is provided with a valve port 311, the valve port 311 is connected with the drain interface 1, the valve core 32 is slidably connected in the passage 310 and can be used to block the valve port 311, and the stop pin 33 is arranged at the other end of the passage 310 and is used to limit the valve core 32 in the passage 310. The other end of the passage 310 is connected with the water and oil centralized exhaust interface 4. Under the condition that the valve core 32 is located at the two sides of the passage 310 with a pressure difference when the auxiliary power device works, the valve core 32 can drive the valve core 32 to close the valve port 311 to prevent oil from entering. When the water is drained, the valve core 32 can be pushed away by the water, and the valve core 32 can make the water continue to pass through the passage 310 and then be discharged through the water and oil centralized exhaust interface 4 under the limiting of the stop pin 33. The stop pin 33 is used to prevent the valve core 32 from blocking the passage 310 close to the water and oil centralized exhaust interface 4.

[0031] The anti-suckback valve 3 further comprises an integrated piece 34, and the valve body 31 is detachably connected in the integrated piece 34. The detachable connection can be a threaded connection or other equivalent connection mode, and the integrated piece 34 is used to integrate the water drain interface 1, the oil drain interface 2, and the water and oil centralized drain interface 4 with the anti-suckback valve 3, further improving the integration degree of the entire drain structure, facilitating the cleaning and maintenance of the valve body 31, and facilitating the connection of the interfaces after integration with the auxiliary power device and the like.

[0032] The valve port 311 is a circular port, and the valve core 32 is a spherical ball. When the pressures at both ends of the spherical ball in the channel 310 are not equal, the spherical ball can be attracted to block or open the valve port 311 by overcoming the friction resistance and gravity of the spherical ball in the valve channel. The spherical ball is a steel ball. The steel ball has good environmental stability and high service life. Of course, those skilled in the art can think of other materials for the spherical ball, as long as the spherical ball can essentially achieve the above-mentioned functions. In addition, the anti-suckback valve 3 is only composed of the valve body 31, the steel ball, the stop pin 33, and the integrated piece 34, and has a simple structure, simple processing technology, and is reliable and practical. Under the action of the gravity of water, the valve can be completely opened, and the drainage is smooth.

[0033] The number of the oil drain interfaces 2 is two, one of which is used for draining lubricating oil, and the other is used for draining fuel. In this way, it is consistent with the arrangement of the oil drain pipeline on the existing auxiliary power device of the aero-engine. Of course, those skilled in the art should be able to think that when the auxiliary power device of the aero-engine is improved, such as increasing the oil drain interface 2 or the water drain interface 1, the number of anti-suckback valves or the structure of the anti-suckback valve 3 can be correspondingly increased or changed. For example, the anti-suckback valve 3 is two, which are respectively connected between the two oil drain interfaces 2 and the water drain interface 1.

[0034] Those skilled in the art should be able to think that the valve port 311 can also have other shapes, such as a rectangular port. One end of the valve core 32 can match and block the rectangular port, and the other end can match and slide in the channel 310. All of them should belong to the concept range of the valve port 311 of the present application.

[0035] Those skilled in the art should be able to think that if there is a spring with a small enough spring force, the negative pressure is sufficient to overcome the spring force to close the valve port 311, that is, the minimum compression spring force of the spring is less than the negative pressure of the water drain interface 1. As shown in the figure, the anti-suckback valve 3 with the spring 35 elastically connected between the valve core 32 and the valve port 311 can also be used, which should also be within the concept range of the anti-suckback valve 3 of the present application. Figure 4

[0036] Those skilled in the art should be able to understand that the anti-suckback valve 3 can also be used in the water and oil centralized drain structure of other auxiliary power devices in other fields, such as automobiles, aircraft, and the like.

[0037] ​It should be noted that the terms "first", "second", and the like in the description of the application are used to distinguish similar objects, and do not necessarily have to be described in a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented. In this application, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings.

[0038] In the description of the present application, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only illustrative of the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A centralized water and oil discharge structure for auxiliary power units, characterized in that, It includes a drain port (1), an oil drain port (2), an anti-backflow valve (3), and a centralized water and oil discharge port (4). The input end of the anti-backflow valve (3) is connected to the drain port (1), the output end of the anti-backflow valve (3) is connected to the centralized water and oil discharge port (4), and the oil drain port (2) is connected to the centralized water and oil discharge port (4). The anti-backflow valve (3) includes a valve body (31), a valve core (32), and a stop pin (33). The valve body (31) has a channel (310). One end of the channel (310) is provided with a valve port (311), which is connected to the drain interface (1). The valve core (32) is slidably connected in the channel (310) and can be used to block the valve port (311). The stop pin (33) is set at the other end of the channel (310) to limit the valve core (32) in the channel (310). The other end of the channel (310) is connected to the water and oil centralized discharge interface (4). A spring (35) is elastically connected between the valve core (32) and the valve port (311); When the auxiliary power unit is working, the anti-backflow valve (3) is used to prevent the discharged fuel and lubricating oil from passing through the drain port (1) due to the negative pressure generated at the drain port (1) end of the auxiliary power unit of the aircraft engine. When the oil is discharged, the negative pressure closes the channel between the anti-backflow valve (3) and the drain port (1), and the oil cannot enter the auxiliary power unit of the aircraft engine at the drain port (1). The oil is discharged through the water and oil centralized discharge port (4) connected at the oil discharge port (2), so it will not enter the auxiliary power unit. When the water is drained, the anti-backflow valve (3) connects the drain port (1) and the water and oil centralized discharge port (4) under the drainage pressure, and the water is discharged from the water and oil centralized discharge port (4).

2. The centralized water and oil discharge structure for auxiliary power units according to claim 1, characterized in that, The anti-backflow valve (3) also includes an integrated component (34), and the valve body (31) is detachably connected to the integrated component (34).

3. The centralized water and oil discharge structure for auxiliary power units according to claim 1, characterized in that, The valve port (311) is a round port, and the valve core (32) is a sphere.

4. The centralized water and oil discharge structure for auxiliary power units according to claim 3, characterized in that, The sphere is a steel ball.

5. The centralized water and oil discharge structure for auxiliary power units according to claim 1, characterized in that, The valve port (311) is rectangular, and one end of the valve core (32) can be matched with the rectangular port to block it, while the other end can be matched with the channel (310) to slide.

6. The centralized water and oil discharge structure for an auxiliary power unit according to claim 1, characterized in that, The minimum compressive force of the spring (35) is less than the negative pressure of the drain port (1).

7. The centralized water and oil discharge structure for auxiliary power units according to claim 1, characterized in that, The number of the oil drain ports (2) is two, one for draining lubricating oil and the other for draining fuel oil.

8. A centralized water and oil discharge structure for an auxiliary power unit according to claim 1, characterized in that, There are two anti-backflow valves (3), which are respectively connected between two oil drain ports (2) and two drain ports (1).

Images