A fuel valve pressure test bench for aircraft

Abstract

The present invention discloses a fuel valve pressure test bench for aircraft, and relates to the technical field of pressure testing. The fuel valve pressure test bench for aircraft includes: an oil supply device, which is used to supply oil with preset pressure to the oil pipe, and one end of the oil supply device is connected to the connecting pipe through the oil delivery pipe; an oil return device, which is configured to recover the oil dumped into the oil storage tank after the test, and the top of the oil return device is connected to the bottom of the oil storage tank; a circulation device, which is used to transport the oil in the oil return device to the oil supply device through a one-way valve, and one end of the circulation device is connected to the oil supply device, and the other end of the circulation device is connected to the oil return device. The fuel valve pressure test bench for aircraft can quickly complete the positioning and fixing of the valve, and the oil return device, the oil supply device and the circulation device are formed into a whole, which is convenient for the control, transportation and circulation of the oil pressure.

Description

Technical Field

[0001] The invention relates to the technical field of pressure testing, and in particular to a fuel valve pressure testing platform for aircraft. Background Art

[0002] The fuel valve is a key component in the fuel system, responsible for controlling the flow and distribution of fuel. If the fuel valve fails to open or close correctly, it may cause a malfunction in the fuel system, which in turn affects the normal flight of the aircraft. By testing the opening and closing of the fuel valve, these problems can be discovered and repaired in time to ensure the normal operation of the fuel system.

[0003] In the known prior art, the opening degree of the valve is controlled by delivering oil of different pressures, and the amount of oil flowing out of the valve within a period of time is obtained. On the basis of ensuring that the pressure and time remain unchanged, the amount of oil flowing out of the standard valve is compared to determine whether the valve is leaking. For ease of use, the staff fixes the valve on the placement head and holds it by hand to adjust the pressure of the oil in the tank so that the oil flowing out of the valve enters the measuring cylinder.

[0004] The handheld placement head is not convenient for quick installation and fixing, and when filling with oil, the placement head is prone to slight movement, causing part of the oil to splash out of the measuring cylinder; when the oil in the tank is used up, the tank needs to be refilled with oil, and the used oil cannot be effectively recycled in time. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a fuel valve pressure test bench for aircraft, which can quickly complete the positioning and fixing of the valve, and integrate the oil return device, the oil supply device and the circulation device into a whole, so as to facilitate the control, transportation and circulation of the oil pressure.

[0006] Technical solution: To achieve the above purpose, the present invention is implemented through the following technical solution: A fuel valve pressure test bench for aircraft, comprising: a cabinet, the top of the cabinet is connected to a workbench, the upper surface of the workbench is provided with an oil storage tank, a connecting pipe is placed in the oil storage tank, one side of the connecting pipe is connected to a placing head, a placing groove is provided at the center of one side of the placing head away from the connecting pipe, a valve is placed in the placing groove, the valve is connected to the placing head, a measuring cylinder is placed directly below the valve, the measuring cylinder is used to contain the oil discharged from the valve outlet during the test and measure the volume of the oil;

[0007] An oil supply device, used for supplying oil of preset pressure into the oil pipe, one end of the oil supply device being connected to the connecting pipe through the oil delivery pipe;

[0008] An oil return device is configured to recover the oil dumped into the oil storage tank after the test, wherein the top of the oil return device is connected to the bottom of the oil storage tank;

[0009] The circulation device is used to transport the oil in the oil return device to the oil supply device through a one-way valve. One end of the circulation device is connected to the oil supply device, and the other end of the circulation device is connected to the oil return device.

[0010] Preferably, a control console is connected to the edge of the top of one side of the workbench, and a plurality of rotary buttons are provided on the control console. A first hole and a second hole are opened through the top of the cabinet. A cover plate is placed on the workbench, and the cover plate is used to seal the oil storage tank. The oil supply device, the oil return device, and the circulation device are all placed in the cabinet.

[0011] Preferably, the oil supply device includes: a first cylinder body, a supporting foot at the bottom of the first cylinder body is connected to the bottom wall of the cabinet, the bottom of the first cylinder body is connected to a filter through a first oil supply pipe, the filter is connected to a first pressure regulator through a second oil supply pipe, the first pressure regulator is used to adjust the pressure of the oil body, the first pressure regulator is connected to a pressure gauge through a third oil supply pipe, the pressure gauge is used to measure the pressure of the oil body in real time, the end of the third oil supply pipe away from the first pressure regulator is connected to a fourth oil supply pipe, one end of the fourth oil supply pipe passes through the second channel and enters the console to be connected to the oil pipeline.

[0012] Preferably, the oil return device includes: a second cylinder body, the supporting feet at the bottom of the second cylinder body are connected to the bottom wall of the cabinet, the second cylinder body and the first cylinder body are symmetrically distributed along the longitudinal axis of the cabinet, the side of the second cylinder body is connected to a pneumatic valve through a first oil return pipe, the top of the pneumatic valve is connected to an oil storage tank through a second oil return pipe, the side of the top of the pneumatic valve is connected to a valve through a first air outlet pipe, the valve is connected to an air source through a first air inlet pipe, the connection or closing of the first air inlet pipe and the second air inlet pipe is controlled by the valve, and the opening or closing of the pneumatic valve is controlled by the action of the gas.

[0013] Preferably, when recovering the oil, the pneumatic valve is started to store the oil through the first cylinder, and when the amount of oil in the first cylinder is greater than nine-tenths of the volume of the first cylinder, the pneumatic valve is closed.

[0014] Preferably, the circulation device includes: a second air inlet pipe, the bottom end of the second air inlet pipe is connected to the air source, the second air inlet pipe is connected to a second air outlet pipe through a reversing valve, the bottom end of the second air outlet pipe is connected to the top of the second cylinder body, the bottom of the second cylinder body is connected to a one-way valve through a pipeline, the end of the one-way valve away from the second cylinder body is connected to the side of the top of the first cylinder body, and the one-way valve is used to control the flow direction of the oil body and make the oil body flow from the second cylinder body to the first cylinder body.

[0015] Preferably, the bottom wall of the oil storage tank is connected to a first support plate and a second support plate, the top of the first support plate is connected to a first placement plate, the first placement plate is adapted to a connecting tube, the connecting tube is placed on the first placement plate, a baffle is connected to the side of the first placement plate away from the measuring cylinder, the top of the second support plate is connected to a second placement plate, the second placement plate is adapted to a placement head, the placement head is placed on the second placement plate, and the measuring cylinder is placed below one end of the second placement plate away from the first placement plate.

[0016] Preferably, a plurality of jacks are provided on a side of the placement head away from the connecting tube, and the jacks are equidistantly distributed in the circumferential direction of the placement head. A plug rod is inserted into the jack, and an end of the plug rod away from the connecting tube is connected to a pressure plate through a ring plate, the diameter of the ring plate is larger than the diameter of the valve, and the diameter of the pressure plate is smaller than the diameter of the valve. A side groove is provided at the edge of the valve, and a gasket is placed in the side groove. When the pressure plate abuts the valve in the placement groove, the end of the valve away from the connecting tube passes through the ring plate and the pressure plate and extends to the outside of the pressure plate. The side of the pressure plate away from the connecting tube is connected to a hydraulic cylinder through a piston rod, and the fixing part of the hydraulic cylinder is connected to the side wall of the oil storage tank.

[0017] Preferably, the opening amplitude of the valve is controlled by inputting oil of different pressures into the connecting pipe, and the amount of oil flowing out of the valve over a period of time is measured by the measuring cylinder to obtain the leakage amount of the valve under different pressure states.

[0018] Beneficial effects: The present invention provides a fuel valve pressure test bench for aircraft. Compared with the prior art, it has the following beneficial effects: 1. The energy supply to the oil supply device, the oil return device, and the circulation device is completed through one gas source, which saves energy and reduces costs. The oil supply device, the oil return device, and the circulation device are connected as a whole, which saves space, facilitates automatic control, and also improves the stability and continuous working capacity of the entire device. There is no need to stop the machine to return oil when there is too much oil in the second cylinder, and there is no need to stop the machine to replenish oil when the first cylinder is short of oil. The oil in the first cylinder and the second cylinder flows with each other to form a dynamic balance, ensuring the continuous and stable operation of the entire device. When testing a large number of valves for a long time, there is no need to stop the machine, and continuous testing can be carried out, which improves the efficiency of the test.

[0019] 2. The oil that meets the pressure passes through the fourth oil supply pipe, the oil delivery pipe, the liquid inlet hole, and the placement head in turn. The oil in the placement head squeezes the valve. Oils of different pressures have different squeezing forces on the valve, and the degree of valve opening is also different. Before the valve test begins, a small amount of oil will flow out, which is a reasonable error and can be ignored. The oil through the valve flows into the measuring cylinder. A period of time is set, and the amount of oil in this period of time is measured by the measuring cylinder. It is compared with the amount of oil flowing out of the standard piston at the same pressure and the same time, so as to judge whether the tested valve has leakage or the degree of leakage under a certain pressure.

[0020] 3. The guide plate is matched with the positioning plate. The positioning plate is used to support the guide plate. When the guide plate is placed on the positioning plate, the socket on the placement head is facing the insertion rod. The hydraulic cylinder is started. The telescopic end of the hydraulic cylinder moves the piston rod, the pressure plate, the ring plate, and the insertion rod toward the placement head in turn. The insertion rod goes deep into the socket. When the insertion rod is fully inserted into the punch hole, the pressure plate presses the gasket and the valve to fix the valve in the placement groove, quickly completing the positioning and fixation of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, further serve to explain the principles of the present application and enable those skilled in the relevant art to make and use the present application.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a diagram of the separation of the cabinet and the workbench.

[0025] Figure 3 This is a diagram showing the separation of the cabinet body and the interior of the cabinet body.

[0026] Figure 4 It is a structural schematic diagram of the oil supply device and the oil return device.

[0027] Figure 5 It is a structural diagram of the oil supply device.

[0028] Figure 6 It is a schematic diagram of the structure of the oil return device.

[0029] Figure 7It is a schematic diagram of the structure of the circulation device.

[0030] Figure 8 It is a structural diagram of the part where the workbench and the control console are located.

[0031] Fig. 9 for Figure 8 Right side cutaway view of the center console.

[0032] Fig.10 It is a separation diagram of the part where the placement head is located and the part where the second placement plate is located, as well as a separation diagram of the part where the placement head is located and the part where the ring plate is located.

[0033] Fig.11 This is a diagram showing the separation of the portion where the head is placed and the portion where the ring plate is placed.

[0034] Fig.12 It is the separation diagram of the placement head and the valve in the placement slot, as well as the exploded diagram of the valve.

[0035] The reference numerals in the figure are: 11 cabinet, 12 first channel, 13 second channel, 21 workbench, 22 control console, 23 cover plate, 24 oil pipeline, 25 oil storage tank, 31 oil supply device, 311 first cylinder, 312 first oil supply pipe, 313 filter, 314 second oil supply pipe, 315 first pressure regulator, 316 third oil supply pipe, 317 pressure gauge, 318 fourth oil supply pipe, 32 oil return device, 321 second cylinder, 322 first oil return pipe, 323 air source, 324 first air intake pipe, 325 valve, 326 The first air outlet pipe, 327 pneumatic valve, 328 second oil return pipe, 33 circulation device, 331 second air inlet pipe, 332 reversing valve, 333 second air outlet pipe, 334 pipeline, 335 one-way valve, 41 first support plate, 42 second support plate, 43 measuring cylinder, 44 first placement plate, 45 second placement plate, 46 baffle, 51 connecting pipe, 52 placement head, 53 placement groove, 54 socket, 55 valve, 56 side groove, 57 gasket, 61 pressure plate, 62 piston rod, 63 hydraulic cylinder, 64 ring plate, 65 plug rod, 7 liquid inlet hole.

[0036] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0039] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Example

[0040] Reference Figure 1 - Figure 4 A fuel valve pressure test bench for an aircraft includes: a fuel supply device 31, which is used to supply oil with a preset pressure into an oil pipe. One end of the fuel supply device 31 is connected to a connecting pipe 51 through an oil delivery pipe 24. The fuel supply device 31 includes: a first cylinder 311. The support foot at the bottom of the first cylinder 311 is connected to the bottom wall of the cabinet 11. The bottom of the first cylinder is connected to a filter 313 through a first fuel supply pipe 312. The filter 313 is connected to a first pressure regulator 315 through a second fuel supply pipe 314. The first pressure regulator 315 is used to adjust the pressure of the oil. The first pressure regulator 315 is connected to a pressure gauge 317 through a third fuel supply pipe 316. The pressure gauge 317 is used to measure the pressure of the oil in real time. The end of the third fuel supply pipe 316 away from the first pressure regulator 315 is connected to a fourth fuel supply pipe 318. One end of the fourth fuel supply pipe 318 passes through the second channel 13 and enters the console 22 to be connected to the oil delivery pipe 24.

[0041] The first pressure regulator 315 is an oil pressure regulator, which is a flow-through overflow valve controlled by a diaphragm. The diaphragm separates the regulator into an upper spring chamber and a lower fuel chamber. The oil pressure regulator controls the opening of the overflow valve through the diaphragm to maintain the pressure balance between the upper and lower sides, thereby achieving regulation of the fuel system pressure.

[0042] The adjustment steps of the oil pressure regulator are as follows: 1. Pressure sensing: When the oil pressure in the fuel chamber rises and exceeds the combined force of the spring pressure and the vacuum gas pressure, the diaphragm will bend upward; when the gas pressure in the intake manifold decreases (the vacuum increases), the diaphragm moves upward, the opening of the return valve increases, the return oil volume increases, and the oil pressure in the fuel distribution pipe decreases; when the gas pressure in the intake manifold increases (the vacuum decreases), the diaphragm moves downward, the opening of the return valve decreases, the return oil volume decreases, and the oil pressure in the fuel distribution pipe increases. 2. Pressure regulation: When the diaphragm is arched upward to a certain extent, the regulator valve 325 opens, and part of the fuel flows back to the fuel tank from the ball valve through the return oil port, reducing the fuel pressure. When the pressure drops to the control oil pressure set by the regulator, the ball valve closes to maintain a certain pressure in the oil circuit from the oil pump check valve 335 to the pressure regulator. 3. Stable pressure: The function of the oil pressure regulator is to ensure that the injection amount of the injector is not affected by the negative pressure of the intake manifold and the oil pressure of the fuel supply system, but is determined by the opening time of the injector valve 325. Through the up and down movement of the diaphragm and the opening and closing of the ball valve, the oil pressure regulator can keep the pressure of the fuel system constant. The pressure gauge 317 measures the pressure of the oil body output after pressure regulation, thereby monitoring the pressure of the oil body and ensuring that the pressure after pressure regulation meets the preset pressure value.

[0043] The control bar is provided with a plurality of rotary buttons, including: a gas source 323 pressure button, a pressure regulating pressure button, an oil return button, an oil supply button, etc. The gas source 323 pressure button is electrically connected to the gas source 323 through a wire, the gas source 323 pressure button is used to control the pressure of the gas flowing out of the gas source 323, and the pressure regulating pressure button is used to adjust the pressure of the oil in the second oil supply pipe 314 so that the pressure of the oil used for the test meets the preset requirements. Press the oil return button to start the oil return; press the oil supply button to start the oil supply.

[0044] The oil return device 32 is configured to recover the oil dumped into the oil storage tank 25 after the test. The top of the oil return device 32 is connected to the bottom of the oil storage tank 25. The oil return device 32 includes: a second cylinder 321, a support foot at the bottom of the second cylinder 321 is connected to the bottom wall of the cabinet 11, the second cylinder 321 and the first cylinder 311 are symmetrically distributed along the longitudinal axis of the cabinet 11, the side of the second cylinder 321 is connected to a pneumatic valve 327 through a first oil return pipe 322, and the top of the pneumatic valve 327 is connected to the oil storage tank through a second oil return pipe 328. 25. The side surface of the top of the pneumatic valve 327 is connected to a valve 325 through a first air outlet pipe 326. The valve 325 is connected to a gas source 323 through a first air inlet pipe 324. The connection or closing of the first air inlet pipe 324 and the second air inlet pipe 331 is controlled by the valve 325. The opening or closing of the pneumatic valve 327 is controlled by the action of gas. When the oil is recovered, the pneumatic valve 327 is started to store the oil through the first cylinder 311. When the amount of oil in the first cylinder 311 is greater than nine-tenths of the volume of the first cylinder 311, the pneumatic valve 327 is closed.

[0045] The circulation device 33 is used to transport the oil in the oil return device 32 to the oil supply device 31 through the one-way valve 335. One end of the circulation device 33 is connected to the oil supply device 31, and the other end of the circulation device 33 is connected to the oil return device 32. The circulation device 33 includes: a second air inlet pipe 331, the bottom end of the second air inlet pipe 331 is connected to the air source 323, the second air inlet pipe 331 is connected to the second air outlet pipe 333 through the reversing valve 332, the bottom end of the second air outlet pipe 333 is connected to the top of the second cylinder body 321, the bottom of the second cylinder body 321 is connected to the one-way valve 335 through the pipeline 334, the end of the one-way valve 335 away from the second cylinder body 321 is connected to the side of the top of the first cylinder body 311, and the one-way valve 335 is used to control the flow direction of the oil and make the oil flow from the second cylinder body 321 to the first cylinder body 311.

[0046] In this example, see Figure 1 - Figure 7 When in use, start the pressure button of the air source 323, adjust the pressure regulating pressure button, adjust the pressure of the output oil body to the preset pressure, press the oil supply button, the first cylinder 311 has a certain pressure, the oil body in the first cylinder 311 enters the filter 313 through the first oil supply pipe 312, the filter 313 is used to filter the output oil body to reduce impurities in the oil body, the filtered oil body enters the first pressure regulator 315 through the second oil supply pipe 314, and the pressure of the oil body is adjusted by the first pressure regulator 315 so that the pressure of the oil body after adjustment reaches the preset pressure, and the oil body after pressure adjustment enters the pressure gauge 317 through the third oil supply pipe 316, the pressure gauge 317 measures the pressure of the oil body and determines whether the pressure of the oil body meets the preset value. If not, stop in time and retest to ensure the accuracy of the test. The oil that meets the pressure passes through the fourth oil supply pipe 318, the oil delivery pipe 24, and the liquid inlet hole 7 in turn into the connecting pipe 51 and the placement head 52. The oil in the placement head 52 squeezes the valve 55. The oils of different pressures have different squeezing forces on the valve 55, and the degree to which the valve 55 is opened is also different. Before the test of the valve 55 begins, a small amount of oil will flow out, which is a reasonable error and can be ignored. The oil through the valve 55 flows into the measuring cylinder 43. A period of time is set, and the amount of oil in the period of time is measured by the measuring cylinder 43. It is compared with the amount of oil flowing out of the standard piston at the same pressure and the same time, so as to judge whether the tested valve 55 has leakage or the degree of leakage under a certain pressure.

[0047] When the measurement of a valve 55 is completed, the pneumatic valve 327 is opened to pour the liquid in the measuring cylinder 43 into the oil storage tank 25. The oil in the oil storage tank 25 enters the second cylinder 321 through the second oil return pipe 328, the pneumatic valve 327, and the first oil return pipe 322 in sequence. As the oil in the second cylinder 321 increases, when the oil amount in the second cylinder 321 reaches nine-tenths of the volume of the second cylinder 321, the oil in the second cylinder 321 needs to be transferred to the first cylinder 311, so as to ensure the continuous oil storage capacity of the second cylinder 321. The reversing valve 332 is started, and the gas in the gas source 323 enters the second cylinder 321 through the reversing valve 332. The pressure on the oil in the second cylinder 321 gradually increases, and the oil is squeezed into the pipe 334. The oil in the pipe 334 enters the first cylinder 311 through the one-way valve 335. Due to the existence of the one-way valve 335, the oil can only enter the first cylinder 311 from the second cylinder 321, and cannot flow from the first cylinder 311 into the second cylinder 321. The gas source 323 not only passes the gas into the first cylinder 311 and the second cylinder 321, so that a certain pressure is always maintained in the first cylinder 311, so that the pressure of the second cylinder 321 increases when the oil is returned, but also serves as the power for adjusting the pneumatic valve 327. Through a simple connection, the first cylinder 311, the second cylinder 321 and the control device are connected together, associated and coordinated with each other, and the storage, output and transportation cycle of the oil body is completed. There is no need to collect the oil body separately, nor is there any need to replenish the oil body, filter and adjust the pressure of the oil supply cylinder separately. The energy supply of the oil supply device 31, the oil return device 32 and the circulation device 33 is completed through an air source 323, saving energy and reducing costs. Moreover, the oil supply device 31, the oil return device 32 and the circulation device 33 are connected as a whole, saving space, facilitating automatic control, and also improving the stability and continuous working capacity of the whole device. There is no need to stop the machine to return the oil when the oil body in the second cylinder 321 is too much, and there is no need to stop the machine to replenish the oil when the first cylinder 311 is short of oil. The oil bodies in the first cylinder 311 and the second cylinder 321 flow mutually, forming a dynamic balance, ensuring the continuous and stable operation of the whole device, and there is no need to stop the machine when testing a large number of valves 55 for a long time, and the test can be continued, which improves the efficiency of the test. Example

[0048] Reference Figure 1 - Fig.12A fuel valve pressure test bench for aircraft, comprising: a cabinet 11, a workbench 21 is connected to the top of the cabinet 11, an oil storage tank 25 is provided on the upper surface of the workbench 21, a connecting pipe 51 is placed in the oil storage tank 25, a placing head 52 is connected to one side of the connecting pipe 51, a placing groove 53 is provided at the center of the placing head 52 away from the connecting pipe 51, a valve 55 is placed in the placing groove 53, the valve 55 is connected to the placing head 52, a measuring cylinder 43 is placed directly below the valve 55, the measuring cylinder 43 is used to contain the oil discharged from the outlet of the valve 55 during the test and measure the volume of the oil, and a measuring cylinder 43 is connected to the edge of the top of one side of the workbench 21. The console 22 is provided with a plurality of rotary buttons. The top of the cabinet 11 is provided with a first hole 12 and a second hole 13. A cover plate 23 is placed on the workbench 21. The cover plate 23 is used to seal the oil storage tank 25. The oil supply device 31, the oil return device 32, and the circulation device 33 are all placed in the cabinet 11. The bottom wall of the oil storage tank 25 is connected with a first support plate 41 and a second support plate 42. The top of the first support plate 41 is connected with a first placement plate 44. The first placement plate 44 is adapted to the connecting pipe 51. The connecting pipe 51 is placed on the first placement plate 44. The first placement plate 44 is connected with a baffle 4 on the side away from the measuring cylinder 43. 6. A second placing plate 45 is connected to the top of the second supporting plate 42. The second placing plate 45 is matched with the placing head 52. The placing head 52 is placed on the second placing plate 45. The measuring cylinder 43 is placed below the end of the second placing plate 45 away from the first placing plate 44. A plurality of plug holes 54 are provided on the side of the placing head 52 away from the connecting tube 51. The plurality of plug holes 54 are evenly distributed in the circumferential direction of the placing head 52. The plug holes 54 are plugged with plug rods 65. The end of the plug rod 65 away from the connecting tube 51 is connected to a pressing plate 61 through a ring plate 64. The diameter of the ring plate 64 is larger than the diameter of the valve 55. The diameter of the pressing plate 61 is smaller than the diameter of the valve 55. A side groove 56 is provided at the edge of the door 55, and a gasket 57 is placed in the side groove 56. When the pressure plate 61 abuts the valve 55 against the placement groove 53, the end of the valve 55 away from the connecting pipe 51 passes through the ring plate 64 and the pressure plate 61 and extends to the outside of the pressure plate 61. The side of the pressure plate 61 away from the connecting pipe 51 is connected to the hydraulic cylinder 63 through the piston rod 62. The fixed part of the hydraulic cylinder 63 is connected to the side wall of the oil storage tank 25. The opening amplitude of the valve 55 is controlled by inputting oil of different pressures into the connecting pipe 51. The amount of oil flowing out of the valve 55 within a period of time is measured by the measuring cylinder 43, and the leakage amount of the valve 55 under different pressure conditions is obtained.

[0049] A gasket 57 is placed between the valve 55 and the pressure plate 61. The pressure plate 61 presses the edge of the valve 55 through the gasket 57. The height of the gasket 57 is higher than the depth of the side groove 56. The gasket 57 is used to protect the valve 55 and reduce the damage to the valve 55 during the extrusion process. The gasket 57 is used to increase the sliding friction of the contact surface with the pressure plate 61 to prevent the pressure plate 61 and the valve 55 from sliding relative to each other.

[0050] In this example, see Figure 1 - Fig.12 When in use, first place the valve 55 in the placement groove 53, and then place the gasket 57 in the side groove 56 at the edge of the valve 55. A notch (not shown) is opened at the top of the first placement plate 44. The connecting pipe 51 and the placement head 52 are placed in the placement rack composed of the first placement plate 44 and the second placement plate 45. The connecting pipe 51 is adapted to the first placement plate 44, and the placement head 52 is adapted to the second placement plate 45. The distance between the side of the valve 55 close to the hydraulic cylinder 63 and the side of the connecting pipe 51 close to the hydraulic cylinder 63 is greater than the length of the second placement plate 45. The second placement plate 45 will not hinder the oil flowing out of the valve 55 from directly flowing into the measuring cylinder 43. Two positioning plates (not shown) are provided on the side of the placement head 52, and the two positioning plates are equidistantly distributed in the circumferential direction of the placement head 52. Two guide plates (not shown) are also provided on the inner wall of the second placement plate 45, and the two guide plates are symmetrically distributed about the longitudinal axis of the second placement plate 45. The guide plates are adapted to the positioning plates, and the positioning plates are used to support the guide plates. When the guide plates are placed on the positioning plates, the socket 54 on the placement head 52 is opposite to the insertion rod 65, and the hydraulic cylinder 63 is started. The telescopic end of the hydraulic cylinder 63 moves the piston rod 62, the pressure plate 61, the ring plate 64, and the insertion rod 65 in turn toward the direction close to the placement head 52, and the insertion rod 65 penetrates into the socket 54. When the insertion rod 65 is fully inserted into the punching hole, the pressure plate 61 presses the gasket 57 and the valve 55, fixes the valve 55 in the placement groove 53, and quickly completes the positioning and fixation of the valve 55.

[0051] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fuel valve pressure test bench for aircraft, characterized in that: include: A cabinet (11), wherein the top of the cabinet (11) is connected to a workbench (21), an oil storage tank (25) is provided on the upper surface of the workbench (21), a connecting pipe (51) is placed in the oil storage tank (25), one side of the connecting pipe (51) is connected to a placement head (52), a placement groove (53) is provided at the center of a side of the placement head (52) away from the connecting pipe (51), a valve (55) is placed in the placement groove (53), the valve (55) is connected to the placement head (52), a measuring cylinder (43) is placed directly below the valve (55), the measuring cylinder (43) is used to contain the oil discharged from the outlet of the valve (55) during the test and measure the volume of the oil, and a control console (22) is connected to the edge of the top of one side of the workbench (21); An oil supply device (31) is used to supply oil at a preset pressure to the oil pipe, one end of the oil supply device (31) being connected to the connecting pipe (51) via the oil delivery pipe (24); The oil supply device (31) comprises: a first cylinder body (311), a support foot at the bottom of the first cylinder body (311) being connected to the bottom wall of the cabinet body (11), a filter (313) being connected to the bottom of the first cylinder body (311) via a first oil supply pipe (312), the filter (313) being connected to a first pressure regulator (315) via a second oil supply pipe (314), the first pressure regulator (315) being used to regulate the pressure of the oil body, the first pressure regulator (315) being connected to a pressure gauge (317) via a third oil supply pipe (316), the pressure gauge (317) being used to measure the pressure of the oil body in real time, the end of the third oil supply pipe (316) away from the first pressure regulator (315) being connected to a fourth oil supply pipe (318), one end of the fourth oil supply pipe (318) passing through the second hole (13) and entering the console (22) to be connected to the oil delivery pipe (24); An oil return device (32) is configured to recover the oil dumped into the oil storage tank (25) after the test, and the top of the oil return device (32) is connected to the bottom of the oil storage tank (25); The oil return device (32) comprises: a second cylinder body (321), the support foot at the bottom of the second cylinder body (321) is connected to the bottom wall of the cabinet body (11), the second cylinder body (321) and the first cylinder body (311) are symmetrically distributed along the longitudinal axis of the cabinet body (11), the side of the second cylinder body (321) is connected to a pneumatic valve (327) via a first oil return pipe (322), the top of the pneumatic valve (327) is connected to an oil storage tank (25) via a second oil return pipe (328), the side of the top of the pneumatic valve (327) is connected to a valve (325) via a first air outlet pipe (326), the valve (325) is connected to an air source (323) via a first air inlet pipe (324), the connection or closing of the first air inlet pipe (324) and the second air inlet pipe (331) is controlled by the valve (325), and the opening or closing of the pneumatic valve (327) is controlled by the action of the gas; A circulation device (33) is used to transport the oil in the oil return device (32) to the oil supply device (31) through a one-way valve (335), one end of the circulation device (33) is connected to the oil supply device (31), and the other end of the circulation device (33) is connected to the oil return device (32); The circulation device (33) comprises: a second air inlet pipe (331), the bottom end of the second air inlet pipe (331) being connected to an air source (323), the second air inlet pipe (331) being connected to a second air outlet pipe (333) via a reversing valve (332), the bottom end of the second air outlet pipe (333) being connected to a top of a second cylinder (321), the bottom of the second cylinder (321) being connected to a one-way valve (335) via a pipe (334), the one end of the one-way valve (335) away from the second cylinder (321) being connected to a side surface of a top of the first cylinder (311), the one-way valve (335) being used to control the flow direction of oil and to allow the oil to flow from the second cylinder (321) to the first cylinder (311).

2. The aircraft fuel valve pressure test bench according to claim 1, characterized in that: The console (22) is provided with a plurality of rotary buttons. A first hole (12) and a second hole (13) are provided through the top of the cabinet (11). A cover plate (23) is placed on the workbench (21). The cover plate (23) is used to seal the oil storage tank (25). The oil supply device (31), the oil return device (32), and the circulation device (33) are all placed in the cabinet (11).

3. The aircraft fuel valve pressure test bench according to claim 1, characterized in that: When recovering the oil, the pneumatic valve (327) is activated to store the oil through the first cylinder (311); when the amount of oil in the first cylinder (311) is greater than nine-tenths of the volume of the first cylinder (311), the pneumatic valve (327) is closed.

4. The aircraft fuel valve pressure test bench according to claim 1, characterized in that: The bottom wall of the oil storage tank (25) is connected to a first support plate (41) and a second support plate (42); the top of the first support plate (41) is connected to a first placement plate (44); the first placement plate (44) is matched with a connecting tube (51); the connecting tube (51) is placed on the first placement plate (44); a baffle (46) is connected to the side of the first placement plate (44) away from the measuring cylinder (43); the top of the second support plate (42) is connected to a second placement plate (45); the second placement plate (45) is matched with a placement head (52); the placement head (52) is placed on the second placement plate (45); the measuring cylinder (43) is placed below an end of the second placement plate (45) away from the first placement plate (44).

5. The aircraft fuel valve pressure test bench according to claim 1, characterized in that: A plurality of insertion holes (54) are provided on a side of the placement head (52) away from the connection tube (51). The plurality of insertion holes (54) are equidistantly distributed in the circumferential direction of the placement head (52). An insertion rod (65) is inserted into the insertion hole (54). An end of the insertion rod (65) away from the connection tube (51) is connected to a pressure plate (61) via a ring plate (64). The diameter of the ring plate (64) is greater than the diameter of the valve (55). The diameter of the pressure plate (61) is less than the diameter of the valve (55). The side of the valve (55) is A side groove (56) is provided at the edge, and a gasket (57) is placed in the side groove (56). When the pressure plate (61) abuts the valve (55) against the placement groove (53), the end of the valve (55) away from the connecting pipe (51) passes through the ring plate (64) and the pressure plate (61) and extends to the outside of the pressure plate (61). The side of the pressure plate (61) away from the connecting pipe (51) is connected to a hydraulic cylinder (63) through a piston rod (62). The fixed part of the hydraulic cylinder (63) is connected to the side wall of the oil storage tank (25).

6. The aircraft fuel valve pressure test bench according to claim 1, characterized in that: The opening amplitude of the valve (55) is controlled by inputting oil of different pressures into the connecting pipe (51), and the amount of oil flowing out of the valve (55) over a period of time is measured by the measuring cylinder (43) to obtain the leakage amount of the valve (55) under different pressure conditions.

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