Turbofan engine lubricating oil interruption test device

Abstract

The utility model discloses a lubricating oil interruption test device for a turbofan engine. The lubricating oil interruption test device comprises a lubricating oil tank, a lubricating oil pump, a low-pressure compressor, a high-pressure compressor and an intermediate case positioned between the low-pressure compressor and the high-pressure compressor, the gas supply device is used for supplying gas to the lubricating oil pump during the test and comprises a gas supply pipeline; the oil supply test device comprises a mounting support, a three-way switching valve mounted on the mounting support, a first oil supply pipeline and a second oil supply pipeline, the three-way switching valve comprises a first communication port, a second communication port and a third communication port, the first communication port of the three-way switching valve is connected with an air supply pipeline, and the second communication port of the three-way switching valve is connected with a second oil supply pipeline. The first oil supply pipeline is connected between a second communication port of the three-way switching valve and the lubricating oil tank, the second oil supply pipeline is connected between a third communication port of the three-way switching valve and the lubricating oil pump, and the three-way switching valve is provided with a first valve position communicated with the first communication port and the third communication port and a second valve position communicated with the second communication port and the third communication port. And the mounting bracket is mounted on the intermediate case.

Description

Technical Field

[0001] The utility model relates to the field of aviation engine test devices, in particular to a turbofan engine lubricating oil interruption test device. Background Art

[0002] During the flight, if an aircraft engine encounters damage, negative acceleration, sudden attitude changes or improper maintenance, the oil supply pump will not be able to draw oil from the oil tank, resulting in oil supply interruption. After the oil supply is interrupted, the gears and bearings inside the engine transmission and lubrication system will work in an environment with little or no oil. The friction of transmission components such as gears and bearings will generate a lot of heat. The temperature of gears and bearings will increase significantly as the oil supply interruption time increases, causing damage to gears and bearings, affecting flight safety.

[0003] To ensure flight safety, an oil interruption test must be carried out before the engine takes off. The oil supply line between the oil tank and the oil supply pump is cut off for a period of time to simulate the oil interruption situation that may occur during flight. Summary of the invention

[0004] The utility model aims to provide a turbofan engine lubricating oil interruption test device which can effectively simulate the turbofan engine lubricating oil interruption working condition.

[0005] The utility model discloses a turbofan engine lubricating oil interruption test device, comprising:

[0006] A turbofan engine, comprising an oil tank, an oil pump, a low-pressure compressor, a high-pressure compressor, and an intermediate casing located between the low-pressure compressor and the high-pressure compressor;

[0007] an air supply device, used for supplying air to the lubricating oil pump during the test, including an air supply pipeline;

[0008] An oil supply test device comprises a mounting bracket, a three-way switching valve mounted on the mounting bracket, a first oil supply pipeline and a second oil supply pipeline, the three-way switching valve comprising a first connecting port, a second connecting port and a third connecting port, the first connecting port of the three-way switching valve is connected to the air supply pipeline, the first oil supply pipeline is connected between the second connecting port of the three-way switching valve and the lubricating oil tank, the second oil supply pipeline is connected between the third connecting port of the three-way switching valve and the lubricating oil pump, the three-way switching valve has a first valve position in which the first connecting port is connected to the third connecting port and a second valve position in which the second connecting port is connected to the third connecting port, and the mounting bracket is mounted on the intermediate casing.

[0009] In some embodiments, the end of the gas supply pipeline away from the three-way switching valve is connected to the outside atmosphere.

[0010] In some embodiments, it also includes a first pressure detection device for detecting the pressure of the hydraulic oil at the inlet end of the first oil supply pipeline and a second pressure detection device for detecting the pressure of the hydraulic oil at the outlet end of the second oil supply pipeline.

[0011] In some embodiments, the first oil supply pipeline and the second oil supply pipeline are metal hoses.

[0012] In some embodiments, the length of the first oil supply pipeline is less than or equal to 20 times of its diameter, and / or the length of the second oil supply pipeline is less than or equal to 20 times of its diameter.

[0013] In some embodiments, the three-way switching valve includes a valve body position indicator. When the three-way switching valve switches between a first valve position and a second valve position, the valve body position indicator accordingly follows the movement of the valve body of the three-way switching valve to display the valve position of the three-way switching valve. The turbofan engine oil interruption test device also includes a monitoring device for monitoring the position of the valve body position indicator.

[0014] In some embodiments, the mounting bracket includes a mounting seat and a mounting plate disposed on the mounting seat, the mounting plate is provided with a plurality of mounting holes, the three-way switching valve is mounted on the mounting plate through the mounting holes, and the mounting seat is connected to the intermediate casing.

[0015] Based on the turbofan engine oil interruption test device provided by the utility model, by arranging the three-way switching valve on the intermediate casing of the turbofan engine, the length of the first oil supply pipeline and the second oil supply pipeline connecting the three-way switching valve with the oil tank and the oil pump can be shortened, thereby reducing the pressure loss in the oil supply process during the test. At the same time, when switching the valve position state of the three-way switching valve, the second oil supply pipeline can also switch the flow medium more quickly, thereby making the turbofan engine's oil interruption test more sensitive and effective.

[0016] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 It is a structural schematic diagram of a part of the structure of a turbofan engine oil interruption test device according to an embodiment of the utility model;

[0019] Figure 2 It is a schematic structural diagram of a turbofan engine according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0022] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0025] As shown in Figure 1, the turbofan engine oil interruption test device of this embodiment includes a turbofan engine, an air supply device and an oil supply test device.

[0026] The turbofan engine includes an oil tank, an oil pump, a low-pressure compressor, a high-pressure compressor, and an intermediate casing between the low-pressure compressor and the high-pressure compressor. Figure 2 In the illustrated embodiment, the low-pressure shaft connected to the low-pressure compressor rotor and the low-pressure turbine rotor is directly connected to the fan, the engine casing includes an intermediate casing 31 located between the low-pressure compressor rotor and the high-pressure compressor rotor, an interstage casing 32 located between the high-pressure turbine rotor and the low-pressure turbine rotor, and a turbine rear casing 33, the low-pressure shaft is supported and connected to the engine casing by three first bearings 100, and the high-pressure shaft connected to the high-pressure compressor rotor and the high-pressure turbine rotor is supported and connected to the engine casing by two second bearings 200.

[0027] The air supply device is used to supply air to the lubricating oil pump during the test, and the air supply device includes an air supply pipeline.

[0028] The oil supply test device includes a mounting bracket 21, a three-way switching valve 22 mounted on the mounting bracket 21, a first oil supply pipeline 231 and a second oil supply pipeline 232. The three-way switching valve 22 includes a first connecting port, a second connecting port and a third connecting port. The first connecting port of the three-way switching valve 22 is connected to the air supply pipeline, the first oil supply pipeline 231 is connected between the second connecting port of the three-way switching valve 22 and the lubricating oil tank, and the second oil supply pipeline 232 is connected between the third connecting port of the three-way switching valve 22 and the lubricating oil pump. In the embodiment shown in the figure, the first oil supply pipeline 231 is connected between the second connecting port of the three-way switching valve 22 and the connecting joint 11 with the lubricating oil tank, and the second oil supply pipeline 232 is connected between the third connecting port of the three-way switching valve 22 and the connecting joint 12 with the lubricating oil pump. The three-way switching valve 22 has a first valve position in which the first connecting port is connected to the third connecting port and a second valve position in which the second connecting port is connected to the third connecting port. When the three-way switching valve 22 is switched to the first valve position, the first oil supply pipeline is connected to the oil pump through the three-way switching valve, and the first oil supply pipeline supplies oil to the oil pump to simulate the working state of the oil pump pumping oil normally and resuming oil pumping after oil pumping is interrupted, the second connecting port and the third connecting port are not connected, and the air supply pipeline is not connected to the oil pump; when the three-way switching valve 22 is switched to the second valve position, the first connecting port and the third connecting port are not connected, the first oil supply pipeline is not connected to the oil pump, the air supply pipeline and the oil pump are connected through the three-way switching valve, and the air supply pipeline supplies air to the oil pump to simulate the working state of the oil pump in the oil interruption state. The mounting bracket 21 is installed on the intermediate casing, and the pipe lengths of the first oil supply pipeline and the second oil supply pipeline connecting the three-way switching valve with the oil tank and the oil pump of the turbofan engine can be set shorter, reducing the pressure loss during oil supply, and the amount of hydraulic oil that can be stored in the second oil supply pipeline will also be reduced, which is conducive to quickly switching from the normal oil pumping state to the oil interruption state for the oil interruption test.

[0029] The turbofan engine oil interruption test device of this embodiment, by setting the three-way switching valve 22 on the intermediate casing of the turbofan engine, can shorten the length of the first oil supply pipeline 231 and the second oil supply pipeline 232 connecting the three-way switching valve 22 with the oil tank and the oil pump, thereby reducing the pressure loss in the oil supply process during the test. At the same time, when switching the valve position state of the three-way switching valve 22, the second oil supply pipeline 232 can also switch the flow medium more quickly, making the turbofan engine's oil interruption test more sensitive and effective.

[0030] In some embodiments, as shown in the figure, the end of the air supply pipeline away from the three-way switching valve 22 is connected to the outside atmosphere. Specifically, during the test, the air supply pipeline can directly transport the air in the test room to the lubricating oil pump to simulate the lubricating oil interruption working state of the lubricating oil pump, which is more realistic for the simulation of the lubricating oil interruption working condition when the turbofan engine is working. In the embodiment shown in the figure, the air supply pipeline is an air supply hard pipe, and a filter can be set at the inlet end of the air supply pipeline to filter the intake air for dust prevention.

[0031] In some embodiments, as shown in the figure, the turbofan engine lubricating oil interruption test device further includes a first pressure detection device 13 for detecting the pressure of the hydraulic oil at the inlet end of the first oil supply pipeline 231 and a second pressure detection device 14 for detecting the pressure of the hydraulic oil at the outlet end of the second oil supply pipeline 232. The arrangement of the first pressure detection device 13 and the second pressure detection device 14 can effectively detect the overall pressure loss of the turbofan engine lubricating oil interruption test device during the test and assist in detecting the change in pipeline pressure before and after the lubricating oil interruption.

[0032] In some embodiments, the first oil supply pipeline 231 and the second oil supply pipeline 232 are metal hoses. Specifically, in the embodiment shown in the figure, they are stainless steel hoses, and the setting of the hoses is more convenient for connection and arrangement.

[0033] In some embodiments, in order to reduce the oil interruption time of the second oil supply pipeline when the oil is interrupted and the recovery time after the oil interruption is restored, the length of the first oil supply pipeline 231 is less than or equal to 20 times its diameter, and / or the length of the second oil supply pipeline 232 is less than or equal to 20 times its diameter.

[0034] In some embodiments, the three-way switching valve 22 includes a valve body position indicator 221. When the three-way switching valve 22 switches between the first valve position and the second valve position, the valve body position indicator 221 moves correspondingly with the valve body of the three-way switching valve 22 to display the valve position of the three-way switching valve 22. Specifically, the three-way switching valve also includes a valve position display hole. In the embodiment shown in the figure, it includes three valve position display holes. The three-way switching valve has a first valve position, a second valve position, and a third valve position where none of the first connecting port, the second connecting port, and the third connecting port are connected. When the valve body position indicator appears in different display holes of the three valve position display holes, it indicates that the three-way switching valve is in different valve positions. The turbofan engine lubricating oil interruption test device also includes a monitoring device 4 for monitoring the valve body position indicator 221. In the embodiment shown in the figure, the monitoring device includes a camera connected to the control device signal. The camera can remotely feedback the valve position state of the three-way switching valve to the control background to achieve remote monitoring.

[0035] In some embodiments, Figure 1As shown, the mounting bracket 21 includes a mounting seat 211 and a mounting plate 212 disposed on the mounting seat 211. The mounting plate 212 is provided with a plurality of mounting holes 213. The three-way switching valve 22 is mounted on the mounting plate 212 through the mounting holes 213. The mounting seat 211 is connected to the intermediate casing. In this embodiment, the mounting position of the three-way switching valve 22 can be easily adjusted by connecting the three-way switching valve 22 to different mounting holes.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A turbofan engine oil interruption test device, characterized in that: include: A turbofan engine, comprising an oil tank, an oil pump, a low-pressure compressor, a high-pressure compressor, and an intermediate casing located between the low-pressure compressor and the high-pressure compressor; an air supply device, used for supplying air to the lubricating oil pump during the test, including an air supply pipeline; An oil supply test device comprises a mounting bracket, a three-way switching valve mounted on the mounting bracket, a first oil supply pipeline and a second oil supply pipeline, the three-way switching valve comprising a first connecting port, a second connecting port and a third connecting port, the first connecting port of the three-way switching valve is connected to the air supply pipeline, the first oil supply pipeline is connected between the second connecting port of the three-way switching valve and the lubricating oil tank, the second oil supply pipeline is connected between the third connecting port of the three-way switching valve and the lubricating oil pump, the three-way switching valve has a first valve position in which the first connecting port is connected to the third connecting port and a second valve position in which the second connecting port is connected to the third connecting port, and the mounting bracket is mounted on the intermediate casing.

2. The turbofan engine oil interruption test device according to claim 1, characterized in that: The end of the air supply pipeline away from the three-way switching valve is connected to the outside atmosphere.

3. The turbofan engine oil interruption test device according to claim 1, characterized in that: It also includes a first pressure detection device for detecting the pressure of the hydraulic oil at the inlet end of the first oil supply pipeline and a second pressure detection device for detecting the pressure of the hydraulic oil at the outlet end of the second oil supply pipeline.

4. The turbofan engine oil interruption test device according to claim 1, characterized in that: The first oil supply pipeline and the second oil supply pipeline are metal hoses.

5. The turbofan engine oil interruption test device according to claim 1, characterized in that: The length of the first oil supply pipeline is less than or equal to 20 times of its diameter, and / or the length of the second oil supply pipeline is less than or equal to 20 times of its diameter.

6. The turbofan engine oil interruption test device according to claim 1, characterized in that: The three-way switching valve includes a valve body position indicator. When the three-way switching valve switches between a first valve position and a second valve position, the valve body position indicator moves accordingly following the valve body of the three-way switching valve to display the valve position of the three-way switching valve. The turbofan engine oil interruption test device also includes a monitoring device for monitoring the position of the valve body position indicator.

7. The turbofan engine oil interruption test device according to claim 1, characterized in that: The mounting bracket includes a mounting seat and a mounting plate arranged on the mounting seat, the mounting plate is provided with a plurality of mounting holes, the three-way switching valve is mounted on the mounting plate through the mounting holes, and the mounting seat is connected to the intermediate casing.

Images