Fuel nozzle flow test bench

Abstract

The invention discloses a fuel nozzle flow test bench, and relates to the technical field of fuel nozzle testing, and the test bench comprises a fuel injection valve which is used for controlling the opening and closing of a plurality of nozzles, and the ports of the nozzles are provided with movable cavities; the measuring box is used for obtaining fuel flow parameters when the fuel injection valve is opened; the communicating pipe is used for guiding the fuel oil to the measuring box; the clamping unit is arranged in the movable cavity and comprises an abutting rod abutting against the communicating pipe. According to the fuel nozzle flow test bed, the abutting rod and the fixing clamp are matched to clamp the communicating pipe, and the pressing block is driven after the abutting rod reaches the unlocking station, so that the pressing block further abuts, the communicating pipe is locked at the nozzle port, and the communicating pipe is locked. At the moment, when the fuel injection valve is started, the phenomenon that the communicating pipe is loosened due to impact force of fuel injection can be effectively avoided, the communicating pipe only needs to be held with one hand in the process, and operation needed for fixing is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fuel nozzle testing, in particular to a fuel nozzle flow test bench. Background Art

[0002] Fuel nozzle flow rate testing is a crucial step in engine testing, primarily used to determine the injection flow rate of fuel nozzles of varying specifications. Multiple nozzles are typically tested simultaneously. This data can be used to determine whether the nozzles meet design requirements, ensuring that the fuel injection system delivers sufficient and uniform fuel flow during operation.

[0003] In conjunction with publication number CN116988906A, publication date 2023-11-03, a fuel nozzle flow test system is disclosed, including an oil supply assembly, an oil outlet pipeline and a liquid flow meter. The oil supply assembly is connected to the inlet of the liquid-gas dual-fuel nozzle and is used to transport liquid fuel. One end of the oil outlet pipeline is connected to the outlet of the liquid-gas dual-fuel nozzle. The liquid flow meter is arranged on the oil outlet pipeline. The gas flow test system includes an air supply assembly, an air outlet pipeline and a gas flow meter. The air supply assembly is connected to the inlet of the liquid-gas dual-fuel nozzle and is used to transport gas fuel. One end of the air outlet pipeline is connected to the outlet of the liquid-gas dual-fuel nozzle, and the gas flow meter is arranged on the air outlet pipeline.

[0004] However, in the prior art including the above-mentioned patent, the injection parameters of the nozzle are obtained by measuring the flow of the oil outlet pipeline. The oil outlet pipeline often uses a rubber connecting tube. There is a gap between the rubber connecting tube and the nozzle. When the pressure in the air rail is too high and the second air outlet pipeline is opened quickly, the pressure generated during the fuel injection will impact the connecting tube, causing the oil outlet pipeline to fall off. Summary of the Invention

[0005] The purpose of the present invention is to provide a fuel nozzle flow test bench for solving the above problems.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a fuel nozzle flow test bench, comprising: A fuel injection valve is used to control the opening and closing of multiple nozzles, and a movable cavity is opened at the nozzle port; a measuring box for obtaining fuel flow parameters when the fuel injection valve is opened; A connecting pipe, which is used to guide the fuel to the measuring box; A clamping unit provided in the active cavity comprises: a pressing rod abutting against the connecting pipe; A fixed clamp is driven to deflect toward the outer wall of the connecting pipe, and an angle-adjustable clamping space is formed between the fixed clamp and the pressing rod, and an arc rod is rotatably provided at the end of the fixed clamp; The pressing block is arranged to slide in the radial direction, and there is an unlocking position in the movable stroke of the pressing rod to enable the pressing block to move.

[0007] Preferably, the fixing clamp is rotatably mounted on the pressing rod, and a torsion spring is provided between the fixing clamp and the pressing rod for maintaining the fixing clamp at a predetermined angle.

[0008] Preferably, it further comprises a latching tooth which cooperates with the fixing clip for one-way rotation; The rotating member is rotatably arranged and connected with the pressing rod, and a hook connection part for the limiting fixing clamp is arranged on the rotating member.

[0009] Preferably, it further comprises a gear ring fixedly arranged in the movable cavity, on which a plurality of slots for plugging and cooperating with the rotating member are opened, and the rotating member under the unlocking station is staggered with the slots.

[0010] Preferably, an upper fixed seat is further included for sliding of the pressure block, and the upper fixed seat is rotatably arranged on the gear ring, and the pressure block and the upper fixed seat keep synchronous movement.

[0011] Preferably, the invention further comprises a sealing ring provided on the pressure rod, on which an air cavity is opened, and a pneumatic rod connected to the air cavity is provided between the two latch teeth, and the pneumatic rod is used to adjust the distance between the latch teeth.

[0012] Preferably, the device further comprises an extension rod for detecting the degree of deformation of the connecting pipe orifice, on which an elastic member is provided for bringing the extension rod closer to the pipe orifice.

[0013] Preferably, the invention further comprises a probe rod which is adaptively adjusted according to the distance between the nozzle and the opening of the connecting pipe, and the extension rod is slidably arranged on the probe rod; A locking rod for locking the upper fixing seat is provided on the probe rod.

[0014] Preferably, a lower fixing seat is provided on the upper fixing seat, and a sliding block for pushing the probe rod is provided on the lower fixing seat in a radially sliding manner.

[0015] Preferably, the fixing clamp is provided with a cable for pulling the slider.

[0016] In the above technical solution, the fuel nozzle flow test bench provided by the present invention has the following beneficial effects: the connecting pipe is clamped by the cooperation of the pressure rod and the fixing clamp, and after the pressure rod reaches the unlocking position, it drives the pressure block to make the pressure block further press and lock the connecting pipe at the nozzle port. At this time, when the fuel injection valve is started, the impact force of the fuel injection can be effectively prevented from causing the connecting pipe to loosen, and the above process only requires holding the connecting pipe with one hand, reducing the operations required for fixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 An overall three-dimensional schematic diagram provided for an embodiment of the present invention; Figure 2 A schematic structural diagram of a fuel injection valve provided in an embodiment of the present invention; Figure 3 A schematic diagram of the test socket and active cavity structure provided by an embodiment of the present invention; Figure 4 A schematic diagram of the sealing ring, the pressure rod, and the fixing clamp structure provided in an embodiment of the present invention; Figure 5 A schematic diagram of the exploded structure of the pressure rod and the fixing clamp provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a rotating member provided in an embodiment of the present invention; Figure 7 A schematic diagram of the gear ring and gear structure provided in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of the upper fixing seat and the lower fixing seat provided in an embodiment of the present invention; Figure 9 A schematic diagram of the structure of the movable cavity, slider, and probe provided in an embodiment of the present invention; Figure 10 A schematic diagram of the structure of the probe rod and the locking rod provided in an embodiment of the present invention; Figure 11 Schematic diagram of the structure of the slider connected to the probe rod and the extension rod provided in an embodiment of the present invention.

[0019] Description of reference numerals: 1. Test bench; 11. Measuring box; 2. Fuel injection valve; 3. Test seat; 31. Active cavity; 32. Probe rod; 33. Extension rod; 34. Locking rod; 35. Clamp; 36. Elastic member; 37. Second spring; 38. Bevel block; 4. Sealing ring; 41. Air cavity; 5. Connecting pipe; 6. Pressure rod; 61. Groove; 62. Fixed block; 63. Mounting shell; 64. Clamping tooth; 65. Pneumatic rod; 66. Rotating member; 67. Pressure part; 68. Locking member; 69. Hooking part; 7. Fixing clamp; 71. Arc rod; 72. Cable; 73. Torsion spring; 74. Stopper; 8. Upper fixed seat; 81. Lower fixed seat; 82. Pressure block; 83. Gear; 84. Rack; 85. Slider; 86. Transmission rod; 87. First spring; 9. Gear ring. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-11 As shown, a fuel nozzle flow test bench includes a test bench 1, including: The fuel injection valve 2 is used to control the opening and closing of multiple nozzles, and a movable cavity 31 is opened at the nozzle port; A measuring box 11, which is used to obtain fuel flow parameters when the fuel injection valve 2 is opened; A connecting pipe 5, which is used to guide the fuel to the measuring box 11; The clamping unit provided in the active cavity 31 comprises: A pressing rod 6 abutting against the connecting pipe 5; The fixing clamp 7 is driven to deflect toward the outer wall of the connecting pipe 5, and an angle-adjustable clamping space is formed between the fixing clamp 7 and the pressing rod 6. The end of the fixing clamp 7 is rotatably provided with an arc rod 71; The pressing block 82 is radially slidable, and there is an unlocking position in the movable stroke of the pressing rod 6 to enable the pressing block 82 to move.

[0022] Specifically, it also includes a test seat 3 arranged on the fuel injection valve 2, on which multiple nozzles of different specifications are detachably assembled, a pressure rod 6 is arranged in the movable cavity 31, and a fixing clamp 7 is rotatably arranged on the pressure rod 6.

[0023] The measuring box 11 is provided with a program for recording fuel flow parameters, including a flow detection unit and a counting program. The fuel injection valve 2 is opened to allow fuel to enter the connecting pipe 5 through nozzles of different specifications and finally enter the measuring box 11 through the connecting pipe 5. Parameters such as the flow rate, weight, and speed of the nozzles of different specifications are recorded. The electronic components involved in the above-mentioned are common technical knowledge known to those skilled in the art and are not described in detail here.

[0024] Furthermore, an elastic airbag can be provided on the pressure rod 6, and the fixing clamp 7 can be driven to deflect by a pneumatic element connected to the elastic airbag, so that when the connecting tube 5 presses the pressure rod 6, the elastic airbag contracts and squeezes the gas inside into the pneumatic element, driving the fixing clamp 7 to deflect toward the connecting tube 5. Alternatively, an induction switch can be provided on the pressure rod 6, and the fixing clamp 7 can be driven to deflect by a motor, or other driving methods known to those skilled in the art can be used to cause the fixing clamp 7 to deflect and clamp the connecting tube 5. At this time, the angle between the pressure rod 6 and the fixing clamp 7 is reduced to a sufficient thickness to accommodate the thickness of the connecting tube 5, which can be adjusted to accommodate different connecting tubes 5. In addition, during the deflection of the fixing clamp 7, the arc rod 71 is driven to abut against the connecting tube 5, so that the pipe mouth of the connecting tube 5 is clamped, and the pressure rod 6 is unlocked.

[0025] A spring may be provided on the pressure block 82, and in a default state, the pressure block 82 is blocked by a blocking member provided on the pressure rod 6, so that the spring is in an energy storage state. When the pressure rod 6 reaches the unlocking position, the pressure block 82 is offset from the blocking member, and the elasticity of the spring is released, pushing the pressure block 82 toward the connecting pipe 5; or a trigger switch may be provided on the pressure rod 6, and the pressure block 82 is driven by a motor. When the pressure rod 6 reaches the unlocking position, it presses the trigger switch, causing the motor to output torque and drive the pressure block 82 to extend toward the connecting pipe 5, and the pressure block 82 presses the connecting pipe 5; or other structures known to those skilled in the art are all possible. The end of the connecting pipe 5 is first clamped by the pressure rod 6 and the fixing clamp 7 to prevent the connecting pipe 5 from falling off, and then the pressure block 82 is driven to further press and lock the connecting pipe 5 at the nozzle port. At this time, when the fuel injection valve 2 is started, the impact force of the fuel injection can effectively prevent the connecting pipe 5 from loosening.

[0026] In the above technology, the connecting pipe 5 is clamped by the cooperation of the pressing rod 6 and the fixing clamp 7, and after the pressing rod 6 reaches the unlocking position, it drives the pressure block 82, so that the pressure block 82 performs further pressing, locking the connecting pipe 5 at the nozzle port. At this time, when the fuel injection valve 2 is started, the impact force of the fuel injection can be effectively prevented from causing the connecting pipe 5 to loosen, and the above process only requires holding the connecting pipe 5 with one hand, reducing the operations required for fixing.

[0027] As an embodiment further provided by the present invention, the fixing clamp 7 is rotatably disposed on the pressing rod 6 , and a torsion spring 73 is provided between the fixing clamp 7 and the pressing rod 6 for maintaining a predetermined angle.

[0028] Specifically, the device further includes a mounting shell 63 that is rotatably disposed within the movable chamber 31 and is used to rotate the pressure rod 6. The two ends of a torsion spring 73 are fixedly disposed on the fixing clamp 7 and the pressure rod 6, respectively. The pressure rod 6 is provided with a groove 61. When the connecting tube 5 is moved upward along the axial diameter of the movable chamber 31, the nozzle of the connecting tube 5 abuts against the pressure rod 6 and slides into the groove 61 along the bottom surface of the pressure rod 6. As the connecting tube 5 continues to move upward, the torsion spring 73 is deformed and stores force. This allows the torsion spring 73 to deform only during the insertion and connection of the connecting tube 5, a relatively short period of time, thereby avoiding elastic fatigue caused by long-term torsion of the torsion spring 73. Subsequently, the stored force of the torsion spring 73 is released, driving the pressure rod 6 to deflect toward the outer wall of the connecting tube 5.

[0029] As another embodiment further provided by the present invention, it further includes a latching tooth 64 that cooperates with the fixing clip 7 for one-way rotation; The rotating member 66 is rotatably arranged and engaged with the pressing rod 6 , and is provided with a hooking portion 69 for limiting the fixing clamp 7 .

[0030] Specifically, the device further includes a fixed block 62 fixedly mounted on the pressure rod 6 and a stopper 74 fixedly mounted on the fixing clamp 7. A rotating member 66 is rotatably mounted on the mounting shell 63, and a latch 64 is slidably mounted on the mounting shell 63. A pressing portion 67 is provided at the end of the rotating member 66 near the pressure rod 6. In the default state, the stopper 74 is located within the hook portion 69, and the position of the fixing clamp 7 is locked. During the upward movement of the connecting pipe 5, the pressure rod 6 is deflected, and the pressure rod 6 causes the torsion spring 73 to deform and store force. During the deflection of the pressure rod 6, the fixed block 62 is rotated, and the fixed block 62 shifts the pressing portion 67, causing the rotating member 66 to rotate. The rotating member 66 then causes the hook portion 69 to deflect and disengage from the stopper 74. After the blocking member 74 is no longer blocked, the fixing clamp 7 deflects under the elastic release of the torsion spring 73, and the fixing clamp 7 cooperates with the latch tooth 64 to rotate in one direction. At this time, the latch tooth 64 will not block the fixing clamp 7, and the fixing clamp 7 stops deflecting when it is pressed against the outer wall of the connecting pipe 5. The latch tooth 64 has a non-returning effect on the fixing clamp 7, so that the fixing clamp 7 is locked, and the angle between the fixing clamp 7 and the pressing rod 6 is fixed, clamping the connecting pipe 5.

[0031] As another embodiment further provided by the present invention, it also includes a gear ring 9 fixedly arranged in the movable cavity 31, which is provided with a plurality of slots for plugging with the rotating member 66, and the rotating member 66 at the unlocking position is staggered with the slots.

[0032] Specifically, the rotating member 66 also includes a locking member 68. Before reaching the unlocking position, the rotating member 66, under the action of its own weight, causes the locking member 68 to be located in the slot. At this time, the rotating member 66 is restricted by the slot of the gear ring 9, thereby preventing the mounting shell 63, the pressure rod 6, and the fixing clamp 7 from moving. When the rotating member 66 reaches the unlocking position, it drives the locking member 68 out of the slot. At this time, the locking member 68 is offset from the slot, and the gear ring 9 no longer restricts the rotating member 66. The mounting shell 63, the pressure rod 6, and the fixing clamp 7 can all rotate relative to the gear ring 9.

[0033] As another embodiment further provided by the present invention, it further includes an upper fixed seat 8 for sliding of the pressure block 82, and the upper fixed seat 8 is rotatably set on the gear ring 9, and the pressure block 82 and the upper fixed seat 8 maintain synchronous movement.

[0034] Specifically, upper fixing seat 8 is rotatably mounted within movable cavity 31, and pressure block 82 is radially slidably mounted within upper fixing seat 8. A plurality of gears 83 are rotatably mounted in a circumferential array on upper fixing seat 8, meshing with gear ring 9. Pressure block 82 is also provided with racks 84 that mesh with gears 83. With gear ring 9 no longer constraining rotating member 66, mounting housing 63, pressure rod 6, and fixing clamp 7 can all rotate relative to gear ring 9.

[0035] At this time, the pressure rod 6 and the fixing clamp 7 both clamp the nozzle of the connecting pipe 5. The connecting pipe 5 is rotated, thereby driving the pressure rod 6, the fixing clamp 7 and the mounting shell 63 to rotate, causing the upper fixing seat 8 to rotate relative to the gear ring 9, driving the multiple gears 83 to revolve relative to the gear ring 9, and the gears 83 rotate under the action of meshing, thereby driving the rack 84 to slide radially and approach the connecting pipe 5. At this time, the rack 84 drives the pressure block 82 to press against the outer wall of the connecting pipe 5, further fixing it. The upper fixing seat 8 and the pressure block 82 move synchronously, allowing the operator to adjust the clamping of the pressure block 82 by rotating the connecting pipe 5. When it is necessary to release the connecting pipe 5, it is only necessary to rotate the connecting pipe 5 in the opposite direction to gradually loosen the pressure block 82.

[0036] As another embodiment further provided by the present invention, it also includes a sealing ring 4 arranged on the pressure rod 6, on which an air cavity 41 is opened, and a pneumatic rod 65 connected to the air cavity 41 is provided between the two teeth 64, and the pneumatic rod 65 is used to adjust the spacing between the teeth 64.

[0037] Specifically, the sealing ring 4 is located between the nozzle and the connecting tube 5, preventing the end of the connecting tube 5 from leaking and preventing the fuel in the nozzle from splashing onto the outer wall of the connecting tube 5. When the connecting tube 5 needs to be released, the connecting tube 5 is further moved upward. The end of the connecting tube 5 squeezes the groove 61, which in turn squeezes the air cavity 41, causing the air in the air cavity 41 to enter the pneumatic rod 65. The gas in the pneumatic rod 65 expands and pushes to both sides, increasing the spacing between the teeth 64 until the teeth 64 are offset from the fixing clip 7. The teeth 64 no longer prevent the fixing clip 7 from returning, and the connecting tube 5 can now be easily removed.

[0038] As another embodiment further provided by the present invention, an extension rod 33 for detecting the degree of deformation of the pipe opening of the connecting pipe 5 is further included, and an elastic member 36 is provided on the extension rod 33 for bringing the extension rod 33 closer to the pipe opening.

[0039] Specifically, the extension rod 33 is radially slidably arranged in the movable cavity 31, and the elastic member 36 pushes the extension rod 33 close to the pipe mouth of the connecting pipe 5. A pressure sensor can be set on the extension rod 33. When the pipe mouth of the connecting pipe 5 is deformed too much, the protruding pipe mouth presses against the extension rod 33 during the rotation of the connecting pipe 5, triggering the pressure sensor, which is connected to the alarm to remind the operator; or a tension detector is set on the elastic member 36. When the pipe mouth of the connecting pipe 5 is deformed too much, the protruding pipe mouth presses against the extension rod 33, thereby causing the elastic member 36 to deform and tension. When the tension exceeds the limit, the tension detector is triggered, and then the operator is reminded through the alarm. Or other detection units known to those skilled in the art are also possible.

[0040] As another embodiment further provided by the present invention, it also includes a probe rod 32 that is adaptively adjusted according to the distance between the nozzle and the opening of the connecting pipe 5, and an extension rod 33 is slidably provided on the probe rod 32; A locking rod 34 for locking the upper fixing seat 8 is provided on the probe rod 32 .

[0041] Specifically, the probe rod 32 is radially slidably arranged in the movable cavity 31, and a bevel block 38 is provided at the end of the locking rod 34. A clamping member 35 that is linearly arranged in the movable cavity 31 and is unidirectionally slidably engaged with the bevel block 38 is provided. The elastic member 36 is located between the extension rod 33 and the probe rod 32, and the extension rod 33 is provided with an inclined surface that is slidably engaged with the probe rod 32. A second spring 37 is provided on the probe rod 32 to pull the probe rod 32 close to the inner wall of the active chamber 31. At this time, the inclined block 38 is restricted by the anti-return function of the clamping member 35, so that the probe rod 32 is maintained at a distance close to the outer wall of the connecting pipe 5. Then the raised pipe mouth of the connecting pipe 5 presses against the extension rod 33, causing the elastic member 36 to contract, and the extension rod 33 moves downward relative to the probe rod 32 under the guidance of the inclined surface, so that the inclined block 38 and the clamping member 35 are staggered. The second spring 37 pulls the probe rod 32, so that the locking rod 34 approaches the outer wall of the upper fixing seat 8 and locks it, so that the upper fixing seat 8 stops rotating, limiting the continued rotation of the connecting pipe 5, and avoiding further deformation of the connecting pipe 5.

[0042] As another embodiment further provided by the present invention, a lower fixing seat 81 is provided on the upper fixing seat 8 , and a slider 85 for pushing the probe rod 32 is radially slidably provided on the lower fixing seat 81 .

[0043] Specifically, the fixed clamp 7 is provided with a cable 72 for pulling the slider 85. A transmission rod 86 is rotatably mounted on each side of the slider 85, fixedly connected to the cable 72. A first spring 87 is disposed between the slider 85 and the lower fixed seat 81, and is used to pull the slider 85 against the inner wall of the active cavity 31. After the block 74 is no longer blocked, the fixed clamp 7 deflects under the elastic release of the torsion spring 73, pulling the cable 72. This deflection of the cable 72 causes the transmission rod 86 to deflect, which in turn causes the slider 85 to slide radially. During this sliding process, the slider 85 pushes against the probe 32. The spacing between the active cavity 31 and the connecting tube 5 determines the degree of deflection of the fixed clamp 7, thereby varying the pulling force on the cable 72. Ultimately, the slider 85 causes the probe 32 to slide radially by varying distances. This allows the probe 32 to adjust according to the spacing between the active cavity 31 and the connecting tube 5, effectively detecting different degrees of deformation of the connecting tube 5. And only after the connecting pipe 5 is in place, the probe rod 32 will approach the outer wall of the connecting pipe 5. At this time, the probe rod 32 and the slider 85 are staggered. When the upper fixed seat 8 rotates, it drives the lower fixed seat 81 to rotate. At this time, the slider 85 rotates with the lower fixed seat 81. The probe rod 32 is staggered to avoid interference when the slider 85 rotates with the lower fixed seat 81.

[0044] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A fuel nozzle flow test bench, comprising a test bench (1), characterized in that: include: A fuel injection valve (2) used to control the opening and closing of a plurality of nozzles, wherein a movable cavity (31) is provided at a nozzle port; A measuring box (11) for obtaining fuel flow parameters when the fuel injection valve (2) is opened; A connecting pipe (5) for guiding the fuel to the measuring box (11); A clamping unit arranged in the active chamber (31) comprises: A pressing rod (6) abutting against the connecting pipe (5); A fixing clamp (7) is driven to deflect toward the outer wall of the connecting pipe (5), and an angle-adjustable clamping space is formed between the fixing clamp (7) and the pressing rod (6), and an arc rod (71) is rotatably provided at the end of the fixing clamp (7); A pressing block (82) is radially slidably arranged, and an unlocking position is provided in the movable stroke of the pressing rod (6) to enable the pressing block (82) to move.

2. A fuel nozzle flow test bench according to claim 1, characterized in that: The fixing clamp (7) is rotatably arranged on the pressing rod (6), and a torsion spring (73) is arranged between the fixing clamp (7) and the pressing rod (6) for maintaining a predetermined angle.

3. A fuel nozzle flow test bench according to claim 1, characterized in that: It also includes a latching tooth (64) that cooperates with the fixing clip (7) for unidirectional rotation; A rotating member (66) is rotatably arranged and abutted against the pressing rod (6), and is provided with a hooking portion (69) for the limiting fixing clamp (7).

4. A fuel nozzle flow test bench according to claim 3, characterized in that: It also includes a gear ring (9) fixedly arranged in the movable cavity (31), on which a plurality of slots for plugging and cooperating with the rotating member (66) are provided, and the rotating member (66) at the unlocking station is staggered with the slots.

5. A fuel nozzle flow test bench according to claim 4, characterized in that: It also includes an upper fixed seat (8) for the pressure block (82) to slide, and the upper fixed seat (8) is rotatably arranged on the gear ring (9), and the pressure block (82) and the upper fixed seat (8) maintain synchronous movement.

6. A fuel nozzle flow test bench according to claim 3, characterized in that: It also includes a sealing ring (4) arranged on the pressure rod (6), on which an air cavity (41) is opened, and a pneumatic rod (65) connected to the air cavity (41) is arranged between the two latch teeth (64), and the pneumatic rod (65) is used to adjust the spacing between the latch teeth (64).

7. A fuel nozzle flow test bench according to claim 5, characterized in that: It also includes an extension rod (33) for detecting the degree of deformation of the pipe mouth of the connecting pipe (5), on which an elastic member (36) is provided for bringing the extension rod (33) closer to the pipe mouth.

8. A fuel nozzle flow test bench according to claim 7, characterized in that: It also includes a probe rod (32) that is adaptively adjusted according to the distance between the nozzle and the orifice of the connecting pipe (5), and the extension rod (33) is slidably arranged on the probe rod (32); The probe rod (32) is provided with a locking rod (34) for locking the upper fixing seat (8).

9. A fuel nozzle flow test bench according to claim 8, characterized in that: A lower fixing seat (81) is arranged on the upper fixing seat (8), and a sliding block (85) for pushing the probe rod (32) is radially slidably arranged on the lower fixing seat (81).

10. A fuel nozzle flow test bench according to claim 9, characterized in that: The fixing clamp (7) is provided with a pulling cable (72) for pulling the sliding block (85).

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