An aero-engine test bench external fuel system

Abstract

The application discloses an aero-engine test bench external fuel system, and belongs to the technical field of aero-engine testing. The aero-engine test bench external fuel system comprises a fuel control mechanism and an accessory integrated mechanism. The fuel control mechanism comprises a float tank, the float tank is communicated with the accessory integrated mechanism through an oil outlet pipe, an oil inlet control valve group is arranged on an oil inlet pipe, and a first fuel supply pump and an oil outlet control valve group are arranged on the oil outlet pipe. The accessory integrated mechanism comprises an accessory trolley, and a fuel filter, a fuel regulating valve and a second fuel supply pump are integrally arranged on the accessory trolley. An engine is connected with the fuel regulating valve through an engine oil return pipe, and the regulating valve is connected with the float tank through a system oil return pipe, so that the oil return of the engine is finally returned to the float tank. The application provides fuel for engine testing through a fuel control system, and simulates the running environment of the engine on an airplane through the accessory integrated mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine test, in particular, relates to an aero-engine test stand external fuel system. BACKGROUND

[0002] The information provided in this section is for the purpose of generally presenting the context of the application. The work of the inventors, to the extent the inventors' work was developed before the filing date of this application, and the descriptions provided herein, neither constitute admissions of prior art nor warranty of the application.

[0003] Due to the aero-engine test, each test system, i.e. test stand, for ground test needs to be designed and manufactured to meet the factory test and delivery of the aero-engine. The installation position of the fuel accessories of most existing aero-engines is designed during the design process of the aircraft or the engine, and most of them are directly installed on the engine, i.e. the test stand design does not need to consider the installation method of the fuel accessories.

[0004] Compared with other aero-engines, the fuel regulating valve, fuel filter, fuel pump and other random accessories of a certain type of aero-engine are not installed on the engine, but during the test of the engine, the engine and the accessories matched with the engine need to be tested at the same time. Therefore, the fuel system designed and manufactured needs to not only provide fuel for the engine test, but also simulate the running environment of the engine on the aircraft by controlling the accessories of the engine.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] In view of at least one of the above technical problems, the present application provides an aero-engine test stand external fuel system, which can provide fuel for engine test through a fuel control system, and simulate the running environment of the engine on the aircraft through an accessory integration mechanism.

[0007] According to one aspect of the present application, an aero-engine test stand external fuel system is provided for providing fuel for engine test and controlling accessories of the engine to simulate the running environment of the engine on the aircraft, the aero-engine test stand external fuel system comprising a fuel control mechanism and an accessory integration mechanism:

[0008] The fuel control mechanism is arranged in the fuel component of the test bed, and is used for providing fuel for engine test. The fuel control mechanism comprises a fuel tank, the fuel tank is communicated with the oil depot through an oil inlet pipe, and the fuel tank is communicated with the accessory integrated mechanism through an oil outlet pipe. An oil inlet control valve group for controlling the oil inlet fuel flow and pressure is arranged on the oil inlet pipe. A first fuel supply pump for pumping oil and an oil outlet control valve group for controlling the fuel pressure and fuel flow are arranged on the oil outlet pipe.

[0009] The accessory integrated mechanism comprises an accessory trolley, the accessory trolley is integrally provided with a fuel filter, a fuel regulating valve and a second fuel supply pump. The fuel regulating valve is connected with the engine through an engine oil inlet pipe and supplies oil to the engine. The second fuel supply pump is arranged on the engine oil inlet pipe and is used for pumping oil to the engine. The engine is connected with the fuel regulating valve through an engine oil return pipe. The regulating valve is connected with the fuel tank through a system oil return pipe to return the oil of the engine to the fuel tank. The fuel filter is arranged on the engine oil return pipe to filter the oil of the engine. The system oil return pipe is provided with a temperature sensor, a pressure sensor and a second fuel flow meter.

[0010] In some embodiments of the present application, the oil inlet control valve group comprises a pressure gauge for measuring the oil inlet fuel pressure and a fuel flow ball valve for controlling the oil inlet fuel flow and pressure.

[0011] In some embodiments of the present application, the oil outlet control valve group comprises an electric ball valve and an overflow valve for controlling the fuel pressure and fuel flow, and a first fuel flow meter for measuring the fuel outlet amount.

[0012] In some embodiments of the present application, the bottom plate of the accessory trolley is provided with a lifting roller assembly, the side wall of the accessory trolley is provided with an adjusting assembly, the adjusting assembly is connected with the lifting roller assembly, the adjusting assembly is used for driving the lifting roller assembly to lift, and then when the accessory trolley needs to be fixed and placed, the lifting roller assembly is lifted to separate from the ground to place the bottom plate of the accessory trolley to the ground. When the accessory trolley needs to be moved, the lifting roller assembly is pushed down to contact the ground and support the accessory trolley to move it through the lifting roller assembly.

[0013] In some embodiments of the present application, the lifting roller assembly comprises a roller and a lifting plate assembly, the bottom plate of the accessory trolley is provided with a limiting hole, the lifting plate assembly is movably arranged in the limiting hole, the roller is arranged at the bottom of the lifting plate assembly, and the lifting plate assembly is connected with the adjusting assembly.

[0014] In some embodiments of the present application, the lifting plate assembly comprises a first lifting member, a second lifting member and a connecting rod, the first lifting member is arranged in the limiting hole at the first end of the bottom plate of the accessory trolley, the first lifting member at both sides is used for connecting with the adjusting assembly, the second lifting member is arranged in the limiting hole at the second end of the bottom plate of the accessory trolley, the roller is arranged at the bottom of each first lifting member and the bottom of each second lifting member, and the connecting rod is used for connecting the first lifting member and the second lifting member at the same side of the accessory trolley.

[0015] In some embodiments of the present application, the adjusting assembly comprises a rotating shaft, a rotating gear and a hand wheel, the rotating shaft is rotatably arranged in the middle of the side wall of the trolley at both sides, one end of the rotating shaft extends out of the side wall of the trolley and is connected with the hand wheel, two rotating gears are arranged on the rotating shaft, the two rotating gears are used for respectively engaging with the pre-set rack on the side wall of the first lifting member at both sides, the hand wheel is used for driving the rotating shaft and the rotating gear to rotate, thereby driving the rack and the second lifting member to lift.

[0016] In some embodiments of the present application, the adjusting assembly further comprises a pushing member, the pushing member is movably arranged on the hand wheel along the axial direction of the rotating shaft, the pushing member is used for the operator to drive the hand wheel to rotate through the pushing member, the locking hole is arranged on the side wall of the trolley, and the first end of the pushing member is used for inserting into the locking hole to lock the hand wheel.

[0017] In some embodiments of the present application, the second end of the pushing member is provided with a handle, and the adjusting assembly further comprises a second compression spring, the second compression spring is arranged between the handle and the hand wheel.

[0018] In some embodiments of the present application, the lifting plate assembly further comprises a first compression spring, the first compression spring is arranged between the bottom plate of the accessory trolley and the connecting rod.

[0019] The present application has the following beneficial effects:

[0020] The application is an aero-engine test bench external fuel system, which is connected with an accessory integrated mechanism through a fuel control mechanism and supplies oil to the accessory integrated mechanism, the accessory integrated mechanism can supply oil to the engine, and the oil return of the engine is filtered and then returned to the fuel control mechanism, and the difference between the oil supply and the oil return of the engine is calculated to indirectly measure the fuel consumption during the test, the measurement process is very simple, efficient and accurate, and no additional fuel consumption measuring mechanism is needed. The accessory trolley of the accessory integrated mechanism integrates and installs the fuel filter, the fuel regulating valve and the second fuel supply pump matched with the engine, and the temperature sensor, the pressure sensor and various part valves, during the test, the running environment of the engine on the airplane is simulated by controlling the engine accessories, and the oil supply, the oil return pressure and the flow of the engine are adjusted. The oil outlet pipe of the fuel control mechanism is connected with the fuel regulating valve and the second fuel supply pump, the fuel regulating valve and the second fuel supply pump are connected with the engine and supply oil to the engine, and the oil return of the engine is filtered by the fuel filter and then returned to the fuel control mechanism, so that the fuel consumption during the test is indirectly measured.

[0021] The system can effectively simulate the running state of the engine on the airplane, meet the ground test requirements, and meet the factory test and pre-delivery test requirements. The accessory trolley is convenient to move, the test bench itself has a small space, and in the case of no test, the accessory trolley can be moved to a designated station for placement, meeting the safety and cleanliness requirements. At the same time, it can be used for other same type aero-engine test benches, and is universal. In addition, the system is applicable to the fuel system of the test bench with separated accessories and aero-engine, and can also be applied to other test bench systems, such as the external lubricating oil system and the external oil seal system, and has good popularization and application value.

[0022] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings that form a part of this application are intended to provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0024] Figure 1 is a schematic diagram of the overall structure of the preferred embodiment of the present application;

[0025] Figure 2 is a schematic diagram of the fuel control mechanism of the preferred embodiment of the present application;

[0026] Figure 3is a schematic diagram of the accessory integration mechanism of the preferred embodiment of the present application;

[0027] Figure 4 is a schematic diagram of the structure of the accessory trolley of the preferred embodiment of the present application;

[0028] Figure 5 is a schematic diagram of the mounting structure of the hand wheel of the preferred embodiment of the present application;

[0029] Figure 6 is a schematic diagram of the structure of the lifting roller assembly of the preferred embodiment of the present application;

[0030] Figure 7 is a schematic diagram of the mounting of the roller of the preferred embodiment of the present application;

[0031] Legend: 100, fuel control mechanism; 101, fuel float tank; 102, pressure gauge; 103, fuel flow ball valve; 104, first fuel supply pump; 105, electric ball valve; 106, first fuel flow meter; 107, overflow valve; 200, accessory integration mechanism; 201, fuel filter; 202, fuel regulating valve; 203, second fuel supply pump; 204, temperature sensor; 205, pressure sensor; 206, second fuel flow meter; 1, accessory trolley; 11, trolley side wall; 12, limiting hole; 2, lifting roller assembly; 21, roller; 22, first lifting piece; 221, rack; 23, second lifting piece; 24, connecting rod; 25, first compression spring; 3, adjusting assembly; 31, rotating shaft; 32, rotating gear; 33, second compression spring; 34, hand wheel; 35, pushing piece; 36, handle. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0033] Figure 1 is a schematic diagram of the overall structure of the preferred embodiment of the present application; Figure 2 is a schematic diagram of the fuel float tank portion of the preferred embodiment of the present application; Figure 3 is a schematic diagram of the accessory integration mechanism of the preferred embodiment of the present application;

[0034] Figure 4 is a schematic diagram of the structure of the accessory trolley of the preferred embodiment of the present application; Figure 5 is a schematic diagram of the mounting structure of the hand wheel of the preferred embodiment of the present application; Figure 6 is a schematic diagram of the structure of the lifting roller assembly of the preferred embodiment of the present application; Figure 7 is a schematic diagram of the mounting of the roller of the preferred embodiment of the present application.

[0035] An aero-engine test bench external fuel system for providing fuel for engine test and controlling engine accessories to simulate the running environment of the engine on the aircraft, the aero-engine test bench external fuel system comprising a fuel control mechanism 100 and an accessory integration mechanism 200:

[0036] The fuel control mechanism 100 is arranged in the test bench fuel component, and the fuel control mechanism 100 is used to provide fuel for engine test, and the fuel control mechanism 100 comprises a float tank 101, the float tank 101 is communicated with the oil depot through an oil inlet pipe, the float tank 101 is communicated with the accessory integration mechanism 200 through an oil outlet pipe, an oil inlet control valve group for controlling the oil inlet fuel flow and pressure is arranged on the oil inlet pipe, a first fuel supply pump 104 for pumping oil and an oil outlet control valve group for controlling the fuel pressure and fuel flow are arranged on the oil outlet pipe;

[0037] The accessory integration mechanism 200 comprises an accessory trolley 1, the accessory trolley 1 is integrally provided with a fuel filter 201, a fuel regulating valve 202 and a second fuel supply pump 203, the fuel regulating valve 202 is connected with the engine through an engine oil inlet pipe and supplies oil to the engine, the second fuel supply pump 203 is arranged on the engine oil inlet pipe and is used to pump oil to the engine; the engine is connected with the fuel regulating valve 202 through an engine oil return pipe, and the fuel regulating valve 202 is connected with the float tank 101 through a system oil return pipe to finally return the oil return of the engine to the float tank 101, the fuel filter 201 is arranged on the engine oil return pipe to filter the oil return of the engine, and a temperature sensor 204, a pressure sensor 205 and a second fuel flow meter 206 are arranged on the system oil return pipe.

[0038] It should be noted that the installation positions of the fuel accessories of most existing engines are designed during the design of the aircraft or the engine, and most of them are directly installed on the engine, that is, the test bench design does not need to consider the installation mode of the fuel accessories. The engine itself has no accessory installation position, so during ground test, the installation mode of the accessories needs to be redesigned during the design of the test bench, and the control logic is considered to simulate the running environment of the engine.

[0039] The accessory trolley 1 has a pipeline interface and a cable plug interface connected with the outside, and both are general interfaces for easy disassembly. The fuel regulating valve 202 is used to adjust the fuel supply amount of the engine, and a solenoid valve can be arranged on the engine oil inlet pipe to control the on-off of the pipeline to control the fuel supply of the engine. The corresponding connecting hose is configured to directly connect the accessory trolley 1 and the aero-engine oil inlet and outlet, and the control cable and the data acquisition cable can be distributed in two adapter plugs to physically isolate and avoid signal interference, thereby improving the system stability. When in use, the accessory trolley 1 can be connected with the plug of the test bench, and the installation is convenient and fast.

[0040] The aero-engine test bench external fuel system of the application is connected with the accessory integration mechanism 200 through the fuel control mechanism 100 and supplies oil to the accessory integration mechanism 200, the accessory integration mechanism 200 can supply oil to the engine, and the oil return of the engine is filtered and then returned to the fuel control mechanism 100, so as to ensure the cleanliness of the system, and the difference between the oil supply and the oil return of the engine can be calculated to indirectly measure the fuel consumption during the test, and the measurement process is very simple, efficient and accurate, without the need of an additional fuel consumption measurement mechanism. The accessory trolley 1 of the accessory integration mechanism 200 integrates and installs the fuel filter 201, the fuel regulating valve 202 and the second fuel supply pump 203 matched with the engine, as well as the temperature sensor 204, the pressure sensor 205 and various part valves, etc. During the test, the running environment of the engine on the airplane is simulated by controlling the engine accessories, and the parameters such as the oil supply, oil return pressure and flow rate of the engine are adjusted. The oil outlet pipe of the fuel control mechanism 100 is connected with the fuel regulating valve 202 and the second fuel supply pump 203, the fuel regulating valve 202 and the second fuel supply pump 203 are connected with the engine and supply oil to the engine, and the oil return of the engine is filtered by the fuel filter 201 and then returned to the fuel control mechanism 100, so as to indirectly measure the fuel consumption during the test.

[0041] The system of the application can effectively simulate the running state of the engine on the airplane, meet the requirements of ground test, and meet the requirements of factory test and pre-delivery test. The accessory trolley is convenient to move, and the space of the test bench itself is small, so the accessory trolley 1 can be moved to a designated position for placement under the condition of no test, so as to meet the requirements of safety and tidiness. At the same time, the accessory trolley can be used for other same type aero-engine test benches, so as to achieve the purpose of one trolley for all. In addition, the system of the application is not only suitable for the fuel system of the test bench with separated accessories and aero-engine, but also can be applied to other test bench systems, such as the external lubricating oil system and the external oil seal system, so as to have good application value.

[0042] Preferably, as shown in Figure 1 , 2 , the oil inlet control valve group includes a pressure gauge 102 for measuring the oil inlet fuel pressure and a fuel flow ball valve 103 for controlling the oil inlet fuel flow rate and pressure.

[0043] It can be understood that the pressure gauge 102 and the fuel flow ball valve 103 can monitor the oil inlet parameters of the fuel control mechanism 100 in real time, so as to facilitate the adjustment of the oil inlet amount and oil inlet pressure of the fuel control mechanism 100, and can provide certain system protection.

[0044] Preferably, as shown in Figure 1 , 3As shown, the oil outlet control valve group includes an electric ball valve 105 and an overflow valve 107 for controlling the fuel pressure and fuel flow, and a first fuel flow meter 106 for metering the fuel outlet amount.

[0045] It can be understood that the fuel outlet amount can be metered by the first fuel flow meter 106, and the fuel consumption during the test can be directly obtained by subtracting the fuel return amount metered by the second fuel flow meter 206, which is very convenient and accurate. The electric ball valve 105 and the overflow valve 107 can control the fuel pressure and fuel flow of the oil outlet pipe, and at the same time protect the system from overtemperature and overpressure.

[0046] Preferably, please refer to Figure 5 、 6 , 7, the bottom plate of the accessory trolley 1 is provided with a lifting roller assembly 2, and the side wall 11 of the accessory trolley 1 is provided with an adjusting assembly 3, the adjusting assembly 3 is connected with the lifting roller assembly 2, the adjusting assembly 3 is used to drive the lifting roller assembly 2 to lift, and then when the accessory trolley 1 needs to be fixed and placed, the lifting roller assembly 2 is lifted to separate from the ground to make the bottom plate of the accessory trolley 1 placed on the ground, and when the accessory trolley 1 needs to be moved, the lifting roller assembly 2 is pushed down to contact the ground and support the accessory trolley 1 to move it through the lifting roller assembly 2.

[0047] Specifically, the lifting roller assembly 2 includes a roller 21 and a lifting plate assembly, the bottom plate of the accessory trolley 1 is provided with a limiting hole 12, the lifting plate assembly is movably arranged in the limiting hole 12, the roller 21 is arranged at the bottom of the lifting plate assembly, and the lifting plate assembly is connected with the adjusting assembly 3.

[0048] It can be understood that by lifting the lifting plate assembly to lift the roller 21 away from the ground when the accessory trolley 1 does not need to be moved, the bottom plate of the accessory trolley 1 can be directly in contact with the ground, realizing the fixed placement of the accessory trolley 1, which is beneficial to improve the stationary stability of the accessory trolley 1. When the accessory trolley 1 needs to be moved, the lifting plate assembly is lowered by the adjusting assembly 3 to contact the ground to support the accessory trolley 1, and at this time the accessory trolley 1 can be easily moved through the roller 21, which greatly expands the functionality of the accessory trolley 1 and improves its use convenience, especially the stability and safety when stationary.

[0049] Preferably, please refer to Figure 6 、 7As shown, the lifting plate assembly comprises a first lifting piece 22, a second lifting piece 23 and a connecting rod 24, the first lifting piece 22 is arranged in the limiting hole 12 at the first end of the bottom plate of the accessory trolley 1, the two first lifting pieces 22 are used to be connected with the adjusting assembly 3, the second lifting piece 23 is arranged in the limiting hole 12 at the second end of the bottom plate of the accessory trolley 1, the roller 21 is arranged at the bottom of each first lifting piece 22 and the bottom of each second lifting piece 23, and the connecting rod 24 is used to connect the first lifting piece 22 and the second lifting piece 23 on the same side of the accessory trolley 1.

[0050] Specifically, the adjusting assembly 3 comprises a rotating shaft 31, a rotating gear 32 and a hand wheel 34, the rotating shaft 31 is rotatably arranged in the middle of the side wall 11 on both sides, and one end of the rotating shaft 31 extends out of the side wall 11 and is connected with the hand wheel 34, the rotating gear 32 is provided with two, the two rotating gears 32 are arranged on the rotating shaft 31, and the two rotating gears 32 are used to be engaged with the pre-set rack 221 on the side wall of the first lifting piece 22 on both sides, respectively, the hand wheel 34 is used to drive the rotating shaft 31 and the rotating gear 32 to rotate, thereby driving the rack 221 and the first lifting piece 22 to lift.

[0051] It can be understood that the operator can drive the rotating shaft 31 and the rotating gear 32 to rotate by rotating the hand wheel 34, and drive the rack 221 and the first lifting piece 22 to lift by rotating the rotating gear 32, and since the first lifting piece 22 is connected with the second lifting piece 23 through the connecting rod 24, synchronous lifting can be realized, thereby driving each roller 21 to lift and realizing different function conversion of the accessory trolley 1.

[0052] It should be noted that the hand wheel 34 can be locked by inserting the pin into the insertion hole of the side wall 11 of the trolley, or the hand wheel 34 can also be locked by tightening the hand wheel 34 with a strap.

[0053] Preferably, as shown in Figure 5 , 6 The adjusting assembly 3 further comprises a pushing piece 35, the pushing piece 35 is movably arranged on the hand wheel 34 along the axial direction of the rotating shaft 31, the pushing piece 35 is used to drive the hand wheel 34 to rotate by the operator through the pushing piece 35, a locking hole is formed in the side wall 11 of the trolley, and the first end of the pushing piece 35 is used to be inserted into the locking hole to lock the hand wheel 34.

[0054] Optionally, the second end of the pushing piece 35 is provided with a handle 36, and the adjusting assembly 3 further comprises a second compression spring 33, the second compression spring 33 is arranged between the handle 36 and the hand wheel 34.

[0055] It can be understood that the operator can conveniently rotate the hand wheel 34 by pushing the pushing piece 35, and the convenience of operation is improved. The pushing piece 35 can also lock the hand wheel 34. The pushing piece 35 is inserted into the locking hole to lock the rotation of the hand wheel 34. When the pushing piece 35 is pulled out of the locking hole, the hand wheel 34 can be driven to rotate, and the operation is very convenient.

[0056] The second compression spring 33 can provide an elastic force for pulling the handle 36 close to the hand wheel 34 when the pushing piece 35 is inserted into the locking hole, and the stability of the pushing piece 35 after being inserted into the locking hole is effectively ensured.

[0057] Preferably, as shown in Figure 7 The lifting plate assembly further comprises a first compression spring 25, which is elastically pressed between the bottom plate of the accessory trolley 1 and the connecting rod 24.

[0058] It can be understood that the first compression spring 25 can provide an elastic force for pushing the connecting rod 24 away from the bottom plate of the accessory trolley 1, so that the first compression spring 25 not only realizes the shock absorption effect of the lifting plate assembly and the roller 21, but also provides an auxiliary pushing force for lifting the lifting plate assembly driven by the rotating gear 32, and the smoothness of lifting is improved.

[0059] It should be noted that the fuel accessories of the engine tested by the existing test bench are installed on the engine, and the test bench only sends or receives signals of the electronic controller of the engine. The electronic controller controls the fuel accessories according to the running state of the engine and the instruction signal of the test bench, that is, the test bench provides fuel with a certain pressure to the engine during testing, and does not directly participate in the control of the fuel accessories of the engine. The internal fuel system of the engine is self-regulated. Since the fuel accessories of the engine are not integrated on the engine in the present application, the test bench cannot indirectly control the accessories of the engine through the electronic controller.

[0060] However, the fuel system design of the test bench of the present application needs to consider the installation mode of the fuel accessories of the engine and the control logic of the accessories. The test bench can control the fuel accessories of the engine, such as supplying power and controlling the opening degree of the valve, and give reasonable control signals during testing. The test bench and the engine controller jointly control the accessories of the engine, so as to achieve the testing purpose.

[0061] It should be noted that in this document, the terms "comprise", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such a process, method, article, or equipment.

[0062] The principles and implementations of the present application are described herein with specific examples. The above examples are only used to help understand the method and its core idea of the present application. The above description is only the preferred embodiments of the present application. It should be pointed out that due to the limited nature of the language expression, there are objectively infinite specific structures, and for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner. The improvements, refinements, changes or combinations, or the application of the inventive concept and technical solution to other fields without improvement, shall be regarded as the protection of the present application.

Claims

1. An external fuel system for an aircraft engine test bench, used to provide fuel for engine testing and control engine accessories to simulate the engine's operating environment on an aircraft, characterized by: The external fuel system of the aero-engine test stand comprises a fuel control mechanism (100) and an accessory integrated mechanism (200): The fuel control mechanism (100) is arranged in the fuel component of the test stand, and is used for providing fuel for engine test. The fuel control mechanism (100) comprises a float tank (101), the float tank (101) is communicated with the oil depot through an oil inlet pipe, the float tank (101) is communicated with the accessory integrated mechanism (200) through an oil outlet pipe, an oil inlet control valve group for controlling the oil inlet fuel flow and pressure is arranged on the oil inlet pipe, a first fuel supply pump (104) for pumping oil and an oil outlet control valve group for controlling the fuel pressure and fuel flow are arranged on the oil outlet pipe; The accessory integrated mechanism (200) comprises an accessory trolley (1), the accessory trolley (1) is integrally provided with a fuel filter (201), a fuel regulating valve (202) and a second fuel supply pump (203), the fuel regulating valve (202) is connected with the engine through an engine oil inlet pipe and supplies oil to the engine, the second fuel supply pump (203) is arranged on the engine oil inlet pipe and is used for pumping oil to the engine; the engine is connected with the fuel regulating valve (202) through an engine oil return pipe, and the fuel regulating valve (202) is connected with the float tank (101) through a system oil return pipe to return the oil of the engine to the float tank (101) finally, the fuel filter (201) is arranged on the engine oil return pipe to filter the oil of the engine, and a temperature sensor (204), a pressure sensor (205) and a second fuel flow meter (206) are arranged on the system oil return pipe.

2. An aircraft engine test cell external fuel system as recited in claim 1, wherein, The oil inlet control valve group comprises a pressure gauge (102) for measuring the oil inlet fuel pressure and a fuel flow ball valve (103) for controlling the oil inlet fuel flow and pressure.

3. An aircraft engine test cell external fuel system as recited in claim 1, wherein, The oil outlet control valve group comprises an electric ball valve (105) and an overflow valve (107) for controlling the fuel pressure and fuel flow, and a first fuel flow meter (106) for measuring the fuel outlet amount.

4. An aircraft engine test cell external fuel system as recited in claim 1, wherein, A lifting roller assembly (2) is arranged on the bottom plate of the accessory trolley (1), an adjusting assembly (3) is arranged on the trolley side wall (11) of the accessory trolley (1), the adjusting assembly (3) is connected with the lifting roller assembly (2), the adjusting assembly (3) is used for driving the lifting roller assembly (2) to lift, so that when the accessory trolley (1) needs to be fixed and placed, the lifting roller assembly (2) is lifted to be separated from the ground to place the bottom plate of the accessory trolley (1) on the ground, and when the accessory trolley (1) needs to be moved, the lifting roller assembly (2) is pushed to be lowered to be in contact with the ground and support the accessory trolley (1) to move the accessory trolley (1) through the lifting roller assembly (2).

5. An aircraft engine test cell external fuel system as recited in claim 4, wherein, The lifting roller assembly (2) comprises a roller (21) and a lifting plate assembly, a limiting hole (12) is formed in the bottom plate of the accessory trolley (1), the lifting plate assembly is movably arranged in the limiting hole (12), the roller (21) is arranged at the bottom of the lifting plate assembly, and the lifting plate assembly is connected with the adjusting assembly (3).

6. An aircraft engine test cell external fuel system as recited in claim 5, wherein, The lifting plate assembly comprises a first lifting piece (22), a second lifting piece (23) and a connecting rod (24), the first lifting piece (22) is arranged in the limiting hole (12) at the first end of the bottom plate of the accessory trolley (1), the first lifting piece (22) at both sides is used for being connected with the adjusting assembly (3), the second lifting piece (23) is arranged in the limiting hole (12) at the second end of the bottom plate of the accessory trolley (1), the roller (21) is arranged at the bottom of each first lifting piece (22) and the bottom of each second lifting piece (23), and the connecting rod (24) is used for connecting the first lifting piece (22) and the second lifting piece (23) at the same side of the accessory trolley (1).

7. An aircraft engine test cell external fuel system as recited in claim 6, wherein, The adjusting assembly (3) comprises a rotating shaft (31), a rotating gear (32) and a hand wheel (34), the rotating shaft (31) is rotatably arranged in the middle of the trolley side wall (11) at both sides, one end of the rotating shaft (31) is arranged outside the trolley side wall (11) and connected with the hand wheel (34), the rotating gear (32) is provided with two, the two rotating gears (32) are arranged on the rotating shaft (31), and the two rotating gears (32) are used for being engaged with the pre-set rack (221) on the side wall of the first lifting piece (22) at both sides, respectively, the hand wheel (34) is used for driving the rotating shaft (31) and the rotating gear (32) to rotate, thereby driving the rack (221) and the first lifting piece (22) to lift.

8. An aircraft engine test cell external fuel system as recited in claim 7, wherein, The adjusting assembly (3) further comprises a pushing piece (35), the pushing piece (35) is movably arranged on the hand wheel (34) along the axial direction of the rotating shaft (31), the pushing piece (35) is used for driving the hand wheel (34) to rotate by the pushing piece (35), the locking hole is arranged on the trolley side wall (11), and the first end of the pushing piece (35) is used for being inserted into the locking hole to lock the hand wheel (34).

9. The external fuel system of an aero-engine test stand according to claim 8, characterized in that, The second end of the pushing piece (35) is provided with a handle (36), and the adjusting assembly (3) further comprises a second compression spring (33), the second compression spring (33) is arranged between the handle (36) and the hand wheel (34).

10. The external fuel system of an aero-engine test stand according to claim 6, characterized in that, The lifting plate assembly further comprises a first compression spring (25), and the first compression spring (25) is arranged between the bottom plate of the accessory trolley (1) and the connecting rod (24).

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