External fuel system of aero-engine test bed

Abstract

The invention discloses an external fuel oil system of an aero-engine test bed, which belongs to the technical field of aero-engine test, and comprises a fuel oil control mechanism and an accessory integration mechanism, the fuel oil control mechanism comprises a floater oil tank, the floater oil tank is communicated with the accessory integration mechanism through an oil outlet pipe, and an oil inlet control valve group is arranged on an oil inlet pipe; a first fuel oil supply pump and an oil outlet control valve group are arranged on the oil outlet pipe; the accessory integration mechanism comprises an accessory trolley; a fuel filter, a fuel regulating valve and a second fuel feed pump are integrated on the accessory trolley; the engine is connected with the fuel regulating valve through an engine oil return pipe, and meanwhile the regulating valve is connected with the floater oil tank through a system oil return pipe so that return oil of the engine can be finally conveyed back to the floater oil tank. According to the invention, fuel oil is provided for the engine test through the fuel oil control system, and the operation environment of the engine on an aircraft is simulated through the accessory integration mechanism.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft engine testing, and in particular, to an external fuel system of an aircraft engine test bench. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present application.

[0003] Due to the needs of aircraft engine testing, various test systems, namely test benches, for ground testing need to be designed and manufactured to meet the factory test and delivery of the aircraft engine. The installation positions of fuel accessories of most existing engines are designed during the aircraft or engine design process, and most of them are directly installed on the engine, that is, the test bench design does not need to consider the installation method of fuel accessories.

[0004] Compared with other aircraft engines, the fuel regulating valve, fuel filter, fuel pump and other random accessories of a certain type of aircraft engine are not installed on the engine, but when the engine is tested, the engine and the accessories that match the engine need to be tested at the same time. Therefore, the fuel system that needs to be designed and manufactured can not only provide fuel for engine testing, but also simulate the operating environment of this type of engine on the aircraft by controlling the engine accessories.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

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

[0007] According to one aspect of the present application, an external fuel system for an aircraft engine test bench is provided, which is used to provide fuel for engine testing and control engine accessories to simulate the operating environment of the engine on an aircraft. The external fuel system for the aircraft engine test bench includes a fuel control mechanism and an accessory integration mechanism:

[0008] The fuel control mechanism is arranged in the fuel part of the test bench, and is used to provide fuel for the engine test. The fuel control mechanism includes a float tank, which is connected to the oil tank through an oil inlet pipe, and the float tank is connected to the accessory integrated mechanism through an oil outlet pipe. The oil inlet pipe is provided with an oil inlet control valve group for controlling the flow rate and pressure of the inlet fuel, and the oil outlet pipe is provided with a first fuel supply pump for pumping oil and an oil outlet control valve group for controlling the fuel pressure and fuel flow;

[0009] The accessory integration mechanism includes an accessory trolley, on which a fuel filter, a fuel regulating valve and a second fuel supply pump are integrated. The fuel regulating valve is connected to 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 to pump oil to the engine. The engine is connected to the fuel regulating valve through an engine oil return pipe, and at the same time, the regulating valve is connected to a float tank through a system oil return pipe to finally return the engine's return oil to the float tank. The fuel filter is arranged on the engine oil return pipe to filter the engine's return oil. A temperature sensor, a pressure sensor and a second fuel flow meter are arranged on the system oil return pipe.

[0010] In some embodiments of the present application, the oil inlet control valve group includes 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 delivery control valve group includes an electric ball valve and a relief valve for controlling the fuel pressure and the fuel flow, and a first fuel flow meter for measuring the fuel delivery amount.

[0012] In some embodiments of the present application, a lifting roller assembly is provided on the bottom plate of the accessory trolley, and an adjustment assembly is provided on the trolley side wall of the accessory trolley, the adjustment assembly is connected to the lifting roller assembly, and the adjustment assembly is used to drive the lifting roller assembly to rise and fall, and then when the accessory trolley needs to be fixed, the lifting roller assembly is lifted off the ground so that the bottom plate of the accessory trolley is placed on the ground, and when the accessory trolley needs to be moved, the lifting roller assembly is pushed down to contact the ground and the accessory trolley is supported to drive it to move through the lifting roller assembly.

[0013] In some embodiments of the present application, the lifting roller assembly includes a roller and a lifting plate assembly. A limiting hole is opened on the bottom plate of the accessory trolley. The lifting plate assembly is movably inserted into the limiting hole. The roller is arranged at the bottom of the lifting plate assembly. The lifting plate assembly is connected to the adjustment assembly.

[0014] In some embodiments of the present application, the lifting plate assembly includes a first lifting member, a second lifting member and a connecting rod, the first lifting member is inserted into the limiting holes on both sides of the first end of the bottom plate of the accessory trolley, the first lifting members on both sides are used to connect with the adjustment assembly, the second lifting member is inserted into the limiting holes on both sides of the second end of the bottom plate of the accessory trolley, rollers are arranged at the bottom of each first lifting member and the bottom of each second lifting member, and the connecting rod is used to connect the first lifting member and the second lifting member on the same side of the accessory trolley.

[0015] In some embodiments of the present application, the adjustment assembly includes a rotating shaft, a rotating gear and a handwheel. The rotating shaft is rotatably arranged in the middle of the trolley side walls on both sides, and one end of the rotating shaft extends out of the trolley side wall and is connected to the handwheel. Two rotating gears are provided, and the two rotating gears are arranged on the rotating shaft. The two rotating gears are used to respectively engage with preset racks on the side walls of the first lifting member on both sides. The handwheel is used to drive the rotating shaft and the rotating gear to rotate, thereby pushing the rack and the second lifting member to rise and fall.

[0016] In some embodiments of the present application, the adjustment component also includes a pushing member, which is movably arranged on the handwheel along the axial direction of the rotating shaft. The pushing member is used for the operator to drive the handwheel to rotate through the pushing member. A locking hole is opened on the side wall of the trolley, and the first end of the pushing member is used to insert into the locking hole to lock the handwheel.

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

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

[0019] This application has the following beneficial effects:

[0020] The present application discloses an external fuel system of an aircraft engine test bench, which is connected to an accessory integrated mechanism through a fuel control mechanism and supplies fuel to the accessory integrated mechanism. The accessory integrated mechanism can supply fuel to the engine, and filter the return oil of the engine and return it to the fuel control mechanism. At the same time, the fuel consumption during the test can be indirectly measured by calculating the difference between the fuel supply and the return oil of the engine. The measurement process is very simple, efficient and accurate, and no additional fuel consumption measurement mechanism is required. The accessory trolley of the accessory integrated mechanism integrates and installs the fuel filter, fuel regulating valve and second fuel supply pump matched with the engine, as well as temperature sensors, pressure sensors and various parts valves. During the test, the operating environment of the engine on the aircraft is simulated by controlling the engine accessories, and the parameters such as the fuel supply, return oil pressure and flow rate of the engine are adjusted. The oil outlet pipe of the float tank of the fuel control mechanism is connected to the fuel regulating valve and the second fuel supply pump, and is connected to the engine through the fuel regulating valve and the second fuel supply pump and supplies fuel to the engine. The return oil of the engine is filtered by the fuel filter and returned to the float tank, so as to achieve the indirect method of measuring the fuel consumption during the test.

[0021] The system of this application can effectively simulate the operating state of the engine on the aircraft, meet the requirements of ground tests, and meet the requirements of factory tests and pre-delivery tests. The accessory cart is easy to move, and the test room itself has a small space. When not testing, the accessory cart can be moved to a designated workstation to meet the requirements of safety and cleanliness. At the same time, it can be used on other aircraft engine test benches of the same model, so that one vehicle can be used universally. In addition, in addition to being applicable to the fuel system of a test bench where accessories are separated from an aircraft engine, the system of this application can also be extended to other test bench systems, such as the engine's external lubricating oil system and external oil seal system, and has good promotion and application value.

[0022] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above at the same time. In addition to the purposes, features and advantages described above, this application also has other purposes, features and advantages. The following will further describe this application in detail with reference to the figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 It 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 float tank portion of the preferred embodiment of the present application;

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

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

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

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

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

[0031] Legend: 100, fuel control mechanism; 101, 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, limit hole; 2, lifting roller assembly; 21, roller; 22, first lifting member; 221, rack; 23, second lifting member; 24, connecting rod; 25, first compression spring; 3, adjustment assembly; 31, rotating shaft; 32, rotating gear; 33, second compression spring; 34, handwheel; 35, pushing member; 36, handle. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

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

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

[0035] An external fuel system for an aircraft engine test bench is used to provide fuel for engine testing and control engine accessories to simulate the operating environment of the engine on an aircraft. The external fuel system for an aircraft engine test bench includes a fuel control mechanism 100 and an accessory integration mechanism 200:

[0036] The fuel control mechanism 100 is arranged in the fuel part of the test bench. The fuel control mechanism 100 is used to provide fuel for the engine test. The fuel control mechanism 100 includes a float tank 101. The float tank 101 is connected to the oil depot through an oil inlet pipe. The float tank 101 is connected to the accessory integrated mechanism 200 through an oil outlet pipe. The oil inlet pipe is provided with an oil inlet control valve group for controlling the flow rate and pressure of the inlet fuel. The oil outlet pipe is provided with a first fuel supply pump 104 for pumping oil and an oil outlet control valve group for controlling the fuel pressure and fuel flow.

[0037] The accessory integration mechanism 200 includes an accessory trolley 1, on which a fuel filter 201, a fuel regulating valve 202 and a second fuel supply pump 203 are integrated. The fuel regulating valve 202 is connected to 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 to the fuel regulating valve 202 through an engine oil return pipe, and at the same time, the fuel regulating valve 202 is connected to the float tank 101 through a system oil return pipe to finally return the engine's return oil to the float tank 101. The fuel filter 201 is arranged on the engine oil return pipe to filter the engine's return oil. The system oil return pipe is provided with a temperature sensor 204, a pressure sensor 205 and a second fuel flow meter 206.

[0038] It should be noted that the installation positions of fuel accessories of most existing engines are designed during the aircraft or engine design process, and most of them are directly installed on the engine, that is, the test bench design does not need to consider the installation method of fuel accessories. However, the engine involved in the present invention itself has no installation position for accessories, so during ground testing, it is necessary to redesign the installation method of its accessories during the test bench design process, consider its control logic, and simulate the operating environment of the engine.

[0039] The accessory trolley 1 is provided with a pipeline interface and a cable plug interface for external connection, and both are universal interfaces for easy disassembly. The fuel supply of the engine is adjusted by the fuel regulating valve 202, and a solenoid valve can be set on the engine oil inlet pipe to control the on-off of the pipeline to control the fuel supply of the engine. The accessory trolley 1 can be directly connected to the oil inlet and outlet of the aircraft engine by configuring the corresponding connecting hose. The control cable and the data acquisition cable can be distributed in two adapter plugs for physical isolation, avoiding signal interference and improving system stability. When in use, the accessory trolley 1 can be connected to the plug of the test bench, which is convenient and quick to install.

[0040] The external fuel system of the aircraft engine test bench of the present application is connected to the accessory integrated mechanism 200 through the fuel control mechanism 100 and supplies fuel to the accessory integrated mechanism 200, and the accessory integrated mechanism 200 can supply fuel to the engine and filter the return oil of the engine and return it to the fuel control mechanism 100 to ensure the cleanliness of the system. At the same time, the fuel consumption during the test can be indirectly measured by calculating the difference between the fuel supply and the return oil of the engine. The measurement process is very simple, efficient and accurate, and no additional fuel consumption measurement mechanism is required. The accessory trolley 1 of the accessory integrated mechanism 200 integrates and installs the fuel filter 201, fuel regulating valve 202 and second fuel supply pump 203 matched with the engine, as well as temperature sensor 204, pressure sensor 205 and various parts valves. During the test, the engine accessories are controlled to simulate the operating environment of the engine on the aircraft, and the parameters such as the engine supply, return oil pressure and flow rate are adjusted. The oil outlet pipe of the float tank 101 of the fuel control mechanism 100 is connected to the fuel regulating valve 202 and the second fuel supply pump 203, and is connected to the engine through the fuel regulating valve 202 and the second fuel supply pump 203 to supply fuel to the engine. The return oil of the engine is filtered by the fuel filter 201 and then flows back to the float tank 101, thereby realizing the indirect method measurement of fuel consumption during the test.

[0041] The system of this application can effectively simulate the running state of the engine on the aircraft, meet the requirements of ground tests, and meet the requirements of factory tests and pre-delivery tests. The accessory cart is easy to move, and the test room itself has a small space. When not testing, the accessory cart 1 can be moved to a designated workstation to meet the requirements of safety and cleanliness. At the same time, it can be used on other aircraft engine test benches of the same model, so that one vehicle can be used universally. In addition, in addition to being applicable to the fuel system of a test bench where accessories are separated from an aircraft engine, the system of this application can also be extended to other test bench systems, such as the engine's external lubricating oil system and external oil seal system, and has good promotion and application value.

[0042] Preferably, please refer to Figure 1 , 2 As shown, 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 and pressure.

[0043] It is understandable that the pressure gauge 102 and the fuel flow ball valve 103 can monitor the oil inlet parameters of the float tank 101 in real time, which is convenient for adjusting the oil inlet amount and oil inlet pressure of the float tank 101, and can provide certain system protection.

[0044] Preferably, please refer to Figure 1 , 3As shown, the oil delivery control valve group includes an electric ball valve 105 and a relief valve 107 for controlling the fuel pressure and the fuel flow, and a first fuel flow meter 106 for measuring the fuel delivery amount.

[0045] It can be understood that the first fuel flow meter 106 can measure the fuel output, and the fuel consumption during the test can be directly obtained by subtracting the fuel return amount measured by the second fuel flow meter 206. The measurement method 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 to prevent the system from over-temperature and over-pressure.

[0046] Preferably, please refer to Figure 5 , 6 As shown in Figures 7 and 8, a lifting roller assembly 2 is provided on the bottom plate of the accessory trolley 1, and an adjusting assembly 3 is provided on the trolley side wall 11 of the accessory trolley 1. The adjusting assembly 3 is connected to the lifting roller assembly 2, and the adjusting assembly 3 is used to drive the lifting roller assembly 2 to rise and fall, and then when the accessory trolley 1 needs to be fixed, the lifting roller assembly 2 is lifted off the ground so that the bottom plate of the accessory trolley 1 is 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 drive it to move through the lifting roller assembly 2.

[0047] Specifically, the lifting roller assembly 2 includes a roller 21 and a lifting plate assembly. A limiting hole 12 is opened on the bottom plate of the accessory trolley 1. The lifting plate assembly is movably inserted into the limiting hole 12. The roller 21 is arranged at the bottom of the lifting plate assembly. The lifting plate assembly is connected to the adjustment assembly 3.

[0048] It is understandable that by driving the roller 21 to move up and down through the lifting plate assembly, when the accessory trolley 1 does not need to be moved, the lifting plate assembly can be lifted to lift the roller 21 off the ground so that the bottom plate of the accessory trolley 1 directly contacts the ground, thereby achieving fixed placement of the accessory trolley 1, which is beneficial to improving the static stability of the accessory trolley 1. When the accessory trolley 1 needs to be moved, the lifting plate assembly is pushed down by the adjustment assembly 3 to contact the roller 21 with the ground to support the accessory trolley 1. 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 is beneficial to improving its convenience of use, especially its stability and safety when stationary.

[0049] Preferably, please refer to Figure 6 , 7As shown, the lifting plate assembly includes a first lifting member 22, a second lifting member 23 and a connecting rod 24. The first lifting member 22 is inserted into the limiting holes 12 on both sides of the first end of the bottom plate of the accessory trolley 1. The first lifting members 22 on both sides are used to connect with the adjustment assembly 3. The second lifting member 23 is inserted into the limiting holes 12 on both sides of the second end of the bottom plate of the accessory trolley 1. The roller 21 is arranged at the bottom of each first lifting member 22 and the bottom of each second lifting member 23. The connecting rod 24 is used to connect the first lifting member 22 and the second lifting member 23 on the same side of the accessory trolley 1.

[0050] Specifically, the adjustment component 3 includes a rotating shaft 31, a rotating gear 32 and a handwheel 34. The rotating shaft 31 is rotatably arranged in the middle of the trolley side wall 11 on both sides, and one end of the rotating shaft 31 extends out of the trolley side wall 11 and is connected to the handwheel 34. There are two rotating gears 32, and the two rotating gears 32 are arranged on the rotating shaft 31. The two rotating gears 32 are used to respectively engage with the preset racks 221 on the side walls of the first lifting member 22 on both sides. The handwheel 34 is used to drive the rotating shaft 31 and the rotating gear 32 to rotate, thereby pushing the rack 221 and the first lifting member 22 to rise and fall.

[0051] It can be understood that the operator can drive the rotating shaft 31 and the rotating gear 32 to rotate by turning the hand wheel 34, and drive the rack 221 and the first lifting member 22 to be lifted and lowered by rotating the gear 32. Since the first lifting member 22 is connected to the second lifting member 23 through the connecting rod 24, synchronous lifting can be achieved, thereby driving each roller 21 to be lifted and lowered, thereby realizing different functional conversions of the accessory trolley 1.

[0052] It should be noted that the hand wheel 34 can be locked by a latch that cooperates with the insertion hole of the trolley side wall 11, or the hand wheel 34 can be tied tightly by a strap or the like to achieve its limit.

[0053] Preferably, please refer to Figure 5 , 6 As shown, the adjustment component 3 also includes a pushing member 35, which is movably arranged on the hand wheel 34 along the axial direction of the rotating shaft 31. The pushing member 35 is used for the operator to drive the hand wheel 34 to rotate through the pushing member 35. A locking hole is opened on the side wall 11 of the trolley, and the first end of the pushing member 35 is used to be inserted into the locking hole to lock the hand wheel 34.

[0054] Optionally, a handle 36 is provided at the second end of the pushing member 35 , and the adjusting assembly 3 further includes a second compression spring 33 , which is compressed between the handle 36 and the hand wheel 34 .

[0055] It can be understood that the pushing member 35 can facilitate the operator to turn the handwheel 34, which is beneficial to improving the convenience of operation. The pushing member 35 can also play the role of locking the handwheel 34. The rotation of the handwheel 34 can be locked by simply inserting the pushing member 35 into the locking hole; and after pulling the pushing member 35 out of the locking hole, the handwheel 34 can be driven to rotate, which is very convenient to operate.

[0056] The second compression spring 33 can provide an elastic force to pull the handle 36 closer to the hand wheel 34 when the pushing member 35 is inserted into the locking hole, thereby effectively ensuring the stability of the pushing member 35 after being inserted into the locking hole.

[0057] Preferably, please refer to Figure 7 As shown, the lifting plate assembly further includes a first compression spring 25 , which is compressed 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 elastic force to push the connecting rod 24 away from the bottom plate of the accessory trolley 1, so that the first compression spring 25 not only achieves a shock-absorbing effect on the lifting plate assembly and the roller 21, but also provides auxiliary driving force for the rotating gear 32 to drive the lifting plate assembly to lift and lower, which is beneficial to improving the smoothness of lifting and lowering.

[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 from the engine's electronic controller. The electronic controller controls the fuel accessories according to the engine's operating status and the test bench's command signal, that is, the test bench only provides fuel of a certain pressure to the engine during the test, and does not directly participate in the control of the engine's fuel accessories, and the engine's internal fuel system adjusts itself; because the present invention involves the engine's fuel accessories that are not integrated on the engine, the test bench cannot indirectly control the engine's accessories through the electronic controller.

[0060] Compared with previous engine test benches, the engine control method of this application is different. The fuel system design of the test bench of this application needs to take into account the installation method of the engine fuel accessories and the control logic of the accessories. The test bench can supply power to the engine fuel accessories, control valve opening and other control actions, and give reasonable control signals during the test; the test bench controls the engine accessories in conjunction with the engine controller to achieve the test purpose.

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

[0062] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection of this 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 operating environment of the engine on an aircraft, characterized in that: The external fuel system of an aircraft engine test bench comprises a fuel control mechanism (100) and an accessory integration mechanism (200): The fuel control mechanism (100) is arranged in the fuel component of the test bench. The fuel control mechanism (100) is used to provide fuel for engine testing. The fuel control mechanism (100) comprises a float tank (101). The float tank (101) is connected to the oil depot via an oil inlet pipe. The float tank (101) is connected to the accessory integrated mechanism (200) via an oil outlet pipe. An oil inlet control valve group for controlling the flow rate and pressure of the inlet fuel 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 integration mechanism (200) comprises an accessory trolley (1), on which a fuel filter (201), a fuel regulating valve (202) and a second fuel supply pump (203) are integrated. The fuel regulating valve (202) is connected to 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 to the fuel regulating valve (202) through an engine oil return pipe. At the same time, the fuel regulating valve (202) is connected to a float oil tank (101) through a system oil return pipe so as to finally return the engine's return oil to the float oil tank (101). The fuel filter (201) is arranged on the engine oil return pipe so as to filter the engine's return oil. The system oil return pipe is provided with a temperature sensor (204), a pressure sensor (205) and a second fuel flow meter (206).

2. The external fuel system of an aircraft engine test bench according to claim 1, characterized in that: 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. The external fuel system of an aircraft engine test bench according to claim 1, characterized in that: The oil output control valve group comprises an electric ball valve (105) and a relief valve (107) for controlling the fuel pressure and fuel flow, and a first fuel flow meter (106) for measuring the fuel output amount.

4. The external fuel system of an aircraft engine test bench according to claim 1, characterized in that: A lifting roller assembly (2) is arranged on the bottom plate of the accessory trolley (1), and an adjustment assembly (3) is arranged on the trolley side wall (11) of the accessory trolley (1). The adjustment assembly (3) is connected to the lifting roller assembly (2), and the adjustment assembly (3) is used to drive the lifting roller assembly (2) to rise and fall, so that when the accessory trolley (1) needs to be fixed, the lifting roller assembly (2) is lifted off the ground so that the bottom plate of the accessory trolley (1) is placed on the ground; 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) so as to be driven to move by the lifting roller assembly (2).

5. The external fuel system of an aircraft engine test bench according to claim 4, characterized in that: The lifting roller assembly (2) comprises a roller (21) and a lifting plate assembly. A limiting hole (12) is provided on the bottom plate of the accessory trolley (1). The lifting plate assembly is movably inserted into the limiting hole (12). The roller (21) is arranged at the bottom of the lifting plate assembly. The lifting plate assembly is connected to the adjustment assembly (3).

6. An external fuel system for an aircraft engine test bench according to claim 5, characterized in that: The lifting plate assembly comprises a first lifting member (22), a second lifting member (23) and a connecting rod (24); the first lifting member (22) is inserted into limiting holes (12) on both sides of the first end of the bottom plate of the accessory trolley (1); the first lifting members (22) on both sides are used to connect with the adjustment assembly (3); the second lifting member (23) is inserted into the limiting holes (12) on both sides of the second end of the bottom plate of the accessory trolley (1); rollers (21) are arranged at the bottom of each first lifting member (22) and the bottom of each second lifting member (23); and the connecting rod (24) is used to connect the first lifting member (22) and the second lifting member (23) on the same side of the accessory trolley (1).

7. An external fuel system for an aircraft engine test bench according to claim 6, characterized in that: 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 walls (11) on both sides, and one end of the rotating shaft (31) extends out of the trolley side wall (11) and is connected to the hand wheel (34). Two rotating gears (32) are provided. The two rotating gears (32) are arranged on the rotating shaft (31). The two rotating gears (32) are used to respectively mesh with racks (221) preset on the side walls of the first lifting member (22) on both sides. The hand wheel (34) is used to drive the rotating shaft (31) and the rotating gear (32) to rotate, thereby pushing the rack (221) and the first lifting member (22) to be lifted or lowered.

8. An external fuel system for an aircraft engine test bench according to claim 7, characterized in that: The adjusting assembly (3) further comprises a pushing member (35), which is movably arranged on the hand wheel (34) along the axial direction of the rotating shaft (31), and the pushing member (35) is used for an operator to drive the hand wheel (34) to rotate through the pushing member (35). A locking hole is provided on the side wall (11) of the trolley, and the first end of the pushing member (35) is used for inserting into the locking hole to lock the hand wheel (34).

9. An external fuel system for an aircraft engine test bench according to claim 8, characterized in that: The second end of the pusher (35) is provided with a handle (36). The adjustment assembly (3) further comprises a second compression spring (33), and the second compression spring (33) is compressed between the handle (36) and the hand wheel (34).

10. An external fuel system for an aircraft engine test bench according to claim 6, characterized in that: The lifting plate assembly also includes a first compression spring (25), which is compressed between the bottom plate of the accessory trolley (1) and the connecting rod (24).

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