A fuel nozzle flow test bench

Abstract

The present invention discloses a fuel nozzle flow test bench, which relates to the technical field of fuel nozzle testing. The test bench includes: a fuel injection valve for controlling the opening and closing of a plurality of nozzles, and an activity chamber is provided at the nozzle port; a measurement box for obtaining fuel flow parameters when the fuel injection valve is opened; a connecting pipe for guiding fuel to the measurement box; a clamping unit disposed in the activity chamber, which includes: a pressing rod abutting against the connecting pipe. The fuel nozzle flow test bench clamps the connecting pipe through the cooperation of the pressing rod and the fixing clip, and after the pressing rod reaches the unlocking position, it drives the pressing block, so that the pressing block makes further pressing to lock the connecting pipe at the nozzle port. At this time, when the fuel injection valve is started, the impact force of fuel injection can be effectively avoided from driving the connecting pipe to become loose, and only one hand needs to hold the connecting pipe in the above process, reducing the operations required for fixing.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel nozzle testing, and more specifically to a fuel nozzle flow test bench. Background Art

[0002] The fuel nozzle flow test is an important part of engine testing, mainly used to measure the fuel injection flow rates of fuel nozzles of different specifications. Usually, multiple fuel nozzles are tested synchronously, and based on these data, it can be determined whether the nozzles meet the design requirements, ensuring that the fuel injection system provides sufficient and uniform fuel volume during operation.

[0003] Combined with the publication number CN116988906A, the publication date is November 3, 2023, which discloses a fuel nozzle flow test system, including a fuel supply component, an oil outlet pipeline, and a liquid flow meter. The fuel supply component 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, and the liquid flow meter is arranged on the oil outlet pipeline. The gas flow test system includes a gas supply component, an air outlet pipeline, and a gas flow meter. The gas supply component 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 patent, by measuring the flow rate of the oil outlet pipeline to obtain the injection parameters of the nozzle, the oil outlet pipeline often uses a rubber connecting pipe, and there is a gap between the rubber connecting pipe and the nozzle. When the pressure in the air rail is too high and the second air outlet pipeline is quickly opened, the pressure generated during fuel injection will impact on the connecting pipe, resulting in the detachment of the oil outlet pipeline. Summary of the Invention

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

[0006] To achieve the above purpose, the present invention provides the following technical solution: A fuel nozzle flow test bench, including a test bench, comprising:

[0007] A fuel injection valve, which is used to control the opening and closing of multiple nozzles, and an activity chamber is provided at the nozzle port;

[0008] A measurement box, which is used to obtain fuel flow parameters when the fuel injection valve is opened;

[0009] A connecting pipe, which is used to divert fuel to the measurement box;

[0010] A clamping unit arranged in the activity chamber, which includes:

[0011] A pressing rod that abuts against the connecting pipe;

[0012] 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 arranged at the end of the fixed clamp;

[0013] The pressing block is radially slidably arranged, and there is an unlocking position in the movable stroke of the pressing rod to enable the pressing block to move.

[0014] Preferably, the fixing clamp is rotatably mounted on the pressure rod, and a torsion spring is provided between the fixing clamp and the pressure rod for maintaining the fixing clamp at a predetermined angle.

[0015] As a preference, it further comprises a latching tooth which cooperates with the fixing clip for unidirectional rotation;

[0016] The rotating member is rotatably arranged and blocked with the pressing rod, and a hook connection part for the position limiting fixing clamp is arranged on the rotating member.

[0017] Preferably, it also includes 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.

[0018] Preferably, it also includes an upper fixed seat for sliding 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.

[0019] Preferably, it further comprises a sealing ring arranged on the pressure rod, on which an air cavity is opened, and a pneumatic rod connected to the air cavity is arranged between the two latch teeth, and the pneumatic rod is used to adjust the distance between the latch teeth.

[0020] Preferably, the device further comprises an extension rod for detecting the degree of deformation of the pipe opening of the connecting pipe, on which an elastic member for bringing the extension rod closer to the pipe opening is arranged.

[0021] Preferably, it also includes a probe rod that 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;

[0022] A locking rod for locking the upper fixing seat is arranged on the probe rod.

[0023] Preferably, a lower fixing seat is arranged on the upper fixing seat, and a sliding block for pushing the probe rod is radially slidably arranged on the lower fixing seat.

[0024] Preferably, the fixing clamp is provided with a cable for pulling the slider.

[0025] In the above technical solution, a 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 pressing rod and the fixing clip, and after the pressing rod reaches the unlocking position, the pressing block is driven, so that the pressing block makes further pressing, and the connecting pipe is locked at the nozzle port. At this time, when the fuel injection valve is started, the impact force of fuel injection can be effectively avoided from driving the connecting pipe to become loose, and only one hand needs to hold the connecting pipe in the above process, reducing the operation required for fixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0027] Figure 1 The overall three-dimensional schematic diagram provided by the embodiment of the present invention;

[0028] Figure 2 The structural schematic diagram of the fuel injection valve provided by the embodiment of the present invention;

[0029] Figure 3 The structural schematic diagram of the test seat and the movable cavity provided by the embodiment of the present invention;

[0030] Figure 4 The structural schematic diagram of the sealing ring, the pressing rod and the fixing clip provided by the embodiment of the present invention;

[0031] Figure 5 The exploded structural schematic diagram of the pressing rod and the fixing clip provided by the embodiment of the present invention;

[0032] Figure 6 The structural schematic diagram of the rotating member provided by the embodiment of the present invention;

[0033] Figure 7 The structural schematic diagram of the toothed ring and the gear provided by the embodiment of the present invention;

[0034] Figure 8 The structural schematic diagram of the upper fixing seat and the lower fixing seat provided by the embodiment of the present invention;

[0035] Figure 9 The structural schematic diagram of the movable cavity, the slider and the probe rod provided by the embodiment of the present invention;

[0036] Figure 10 The structural schematic diagram of the probe rod and the locking rod provided by the embodiment of the present invention;

[0037] Figure 11 The structural schematic diagram of the slider connecting the probe rod and the extension rod provided by the embodiment of the present invention.

[0038] Description of the reference numerals:

[0039] 1. Test bench; 11. Measuring box; 2. Fuel injection valve; 3. Test seat; 31. Movable cavity; 32. Probe rod; 33. Extension rod; 34. Locking rod; 35. Clamping part; 36. Elastic part; 37. Second spring; 38. Tapered block; 4. Sealing ring; 41. Air cavity; 5. Connecting pipe; 6. Pressing rod; 61. Groove; 62. Fixed block; 63. Mounting shell; 64. Teeth; 65. Pneumatic rod; 66. Rotating part; 67. Pressing part; 68. Locking part; 69. Hook part; 7. Fixed clamp; 71. Arc rod; 72. Cable; 73. Torsion spring; 74. Stopper; 8. Upper fixed seat; 81. Lower fixed seat; 82. Pressing block; 83. Gear; 84. Rack; 85. Slide block; 86. Transmission rod; 87. First spring; 9. Tooth ring. Detailed implementation manners

[0040] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] As Figures 1-11 shown, a fuel nozzle flow test bench includes a test bench 1, including:

[0042] A fuel injection valve 2, which is used to control the opening and closing of a plurality of nozzles, and a movable cavity 31 is provided at the nozzle port;

[0043] A measuring box 11, which is used to obtain fuel flow parameters when the fuel injection valve 2 is opened;

[0044] A connecting pipe 5, which is used to guide fuel to the measuring box 11;

[0045] A clamping unit provided in the movable cavity 31, including:

[0046] A pressing rod 6 in contact with the connecting pipe 5;

[0047] A fixed clamp 7 driven to deflect towards the outer wall of the connecting pipe 5, which forms an angle-adjustable clamping space with the pressing rod 6, and an arc rod 71 is rotatably provided at the end of the fixed clamp 7;

[0048] A pressing block 82 slidably arranged in the radial direction, and there is an unlocking position in the moving stroke of the pressing rod 6 to enable the pressing block 82 to move.

[0049] Specifically, it further includes a test seat 3 provided on the fuel injection valve 2, on which a plurality of nozzles of different specifications are detachably assembled, the pressing rod 6 is arranged in the movable cavity 31, and the fixed clamp 7 is rotatably arranged on the pressing rod 6.

[0050] 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 the fuel to enter the connecting pipe 5 through nozzles of different specifications, and finally enter the measuring box 11 through the connecting pipe 5, and record parameters such as the flow, weight and speed of nozzles of different specifications. The above-mentioned electronic components involved are common technical knowledge known to those skilled in the art and will not be elaborated here.

[0051] Furthermore, an elastic airbag may be provided on the pressing rod 6, and the fixing clamp 7 may be driven to deflect by a pneumatic element connected to the elastic airbag, so that when the connecting tube 5 presses the pressing 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, or an induction switch may be provided on the pressing rod 6, and the fixing clamp 7 may be driven to deflect by a motor, or other driving methods known to those skilled in the art may be used to deflect the fixing clamp 7 and clamp the connecting tube 5. At this time, the angle between the pressing rod 6 and the fixing clamp 7 is reduced to a thickness sufficient to accommodate the connecting tube 5, and the thickness may be adjusted to accommodate different connecting tubes 5, and during the deflection of the fixing clamp 7, the arc rod 71 is driven to abut against the connecting tube 5, so that the tube mouth of the connecting tube 5 is clamped, and the unlocking position of the pressing rod 6 is reached.

[0052] A spring may be provided on the pressure block 82, and in the default state, the pressure block 82 is blocked by the 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 and pushes the pressure block 82 to extend 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, and the pressure rod 6 squeezes the trigger switch when it reaches the unlocking position, so that the motor outputs torque and drives 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 acceptable. The port 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 the connecting pipe 5 is locked 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.

[0053] In the above technology, the connecting pipe 5 is clamped by the cooperation of the pressing rod 6 and the fixing clamp 7, and the pressing rod 6 drives the pressure block 82 after reaching the unlocking position, so that the pressure block 82 performs further pressing to 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 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.

[0054] 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 disposed between the fixing clamp 7 and the pressing rod 6 for maintaining a predetermined angle.

[0055] Specifically, it also includes a mounting shell 63 that is rotatably disposed in the active cavity 31 and is used for the pressing rod 6 to rotate. The two ends of the torsion spring 73 are respectively fixedly disposed on the fixing clamp 7 and the pressing rod 6, and a groove 61 is disposed on the pressing rod 6. When the connecting tube 5 is moved upward along the axial diameter direction of the active cavity 31, the pipe mouth of the connecting tube 5 abuts against the pressing rod 6, and slides into the groove 61 along the bottom surface of the pressing rod 6. When the connecting tube 5 continues to move upward, the torsion spring 73 is driven to deform and store force, so that the torsion spring 73 is only deformed during the process of plugging the connecting tube 5, and the overall time is short, avoiding elastic fatigue caused by long-term torsion of the torsion spring 73, and then the torsion spring 73 is released to drive the pressing rod 6 to deflect toward the outer wall of the connecting tube 5.

[0056] As another embodiment further provided by the present invention, it also includes a latching tooth 64 that cooperates with the fixing clip 7 for unidirectional rotation;

[0057] The rotating member 66 is rotatably arranged and is in blocking contact with the pressing rod 6 , and a hooking portion 69 for limiting the fixing clamp 7 is arranged on the rotating member 66 .

[0058] Specifically, it also includes a fixed block 62 fixedly arranged on the pressure rod 6 and a stopper 74 fixedly arranged on the fixing clamp 7, a rotating member 66 is rotatably arranged on the mounting shell 63, a latch 64 is slidably arranged on the mounting shell 63, and a pressing portion 67 is arranged at the end of the rotating member 66 close to the pressure rod 6. In the default state, the stopper 74 is located in the hooking 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 driven to deflect, 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 driven to rotate, and the fixed block 62 moves the pressing portion 67 to rotate the rotating member 66, and the rotating member 66 drives the hooking 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 for unidirectional rotation. 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 tube 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, so as to clamp the connecting tube 5.

[0059] As another embodiment further provided by the present invention, it also includes a gear ring 9 fixedly disposed in the movable cavity 31, on which a plurality of slots for plugging and cooperating with the rotating member 66 are opened, and the rotating member 66 at the unlocking station is staggered with the slots.

[0060] Specifically, the rotating member 66 further includes a locking member 68. When not reaching the unlocking position, under the action of its own weight, the rotating member 66 makes the locking member 68 located in the slot. At this time, the rotating member 66 is restricted by the slot of the gear ring 9, so that the mounting shell 63, the pressing rod 6 and the fixing clip 7 are all immovable. When the rotating member 66 reaches the unlocking position, it drives the locking member 68 to disengage from the slot. At this time, the locking member 68 is staggered from the slot, and the gear ring 9 no longer restricts the rotating member 66. The mounting shell 63, the pressing rod 6 and the fixing clip 7 can all rotate relative to the gear ring 9.

[0061] As yet another embodiment further provided by the present invention, it further includes an upper fixing seat 8 for the sliding of the pressing block 82, and the upper fixing seat 8 is rotatably arranged on the gear ring 9, and the pressing block 82 moves synchronously with the upper fixing seat 8.

[0062] Specifically, the upper fixing seat 8 is rotatably arranged in the moving cavity 31, and the pressing block 82 is slidably arranged in the upper fixing seat 8 along the radial direction. A plurality of gears 83 meshing with the gear ring 9 are rotatably arranged in a circumferential array on the upper fixing seat 8, and a rack 84 meshing and driving with the gear 83 is arranged on the pressing block 82. After the gear ring 9 no longer restricts the rotating member 66, the mounting shell 63, the pressing rod 6 and the fixing clip 7 can all rotate relative to the gear ring 9.

[0063] At this time, both the pressing rod 6 and the fixing clip 7 clamp the pipe orifice of the communicating pipe 5. Rotating the communicating pipe 5 drives the pressing rod 6, the fixing clip 7 and the mounting shell 63 to rotate, so that the upper fixing seat 8 rotates relative to the gear ring 9, driving a plurality of gears 83 to revolve relative to the gear ring 9, and the gears 83 rotate on their own under the action of meshing, thereby driving the rack 84 to slide radially and approach the communicating pipe 5. At this time, the rack 84 drives the pressing block 82 to press against the outer wall of the communicating pipe 5 for further fixation. The upper fixing seat 8 and the pressing block 82 move synchronously, enabling the operator to adjust the clamping of the pressing block 82 by rotating the communicating pipe 5. When it is necessary to release the communicating pipe 5, only reverse rotation of the communicating pipe 5 can make the pressing block 82 gradually loosen.

[0064] As yet another embodiment further provided by the present invention, it further includes a sealing ring 4 arranged on the pressing rod 6, an air cavity 41 is formed thereon, and a pneumatic rod 65 communicating with the air cavity 41 is arranged between two engaging teeth 64, and the pneumatic rod 65 is used for adjusting the distance between the engaging teeth 64.

[0065] Specifically, the sealing ring 4 is located between the nozzle and the connecting tube 5, and plays a role in preventing leakage of the port of the connecting tube 5, 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 continued to move upward, and the groove 61 is driven upward by the compression of the groove 61 by the port of the connecting tube 5. The groove 61 squeezes the air cavity 41 so that the air in the air cavity 41 enters the pneumatic rod 65. The gas in the pneumatic rod 65 expands and pushes to both sides, so that the spacing between the latch teeth 64 increases, until the latch teeth 64 are staggered with the fixing clip 7, and the latch teeth 64 no longer check the fixing clip 7. At this time, the connecting tube 5 can be easily pulled out.

[0066] As another embodiment further provided by the present invention, 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 for bringing the extension rod 33 close to the pipe mouth is arranged.

[0067] Specifically, the extension rod 33 is radially slidably arranged in the movable cavity 31, and the elastic member 36 pushes the extension rod 33 to approach the pipe mouth of the connecting pipe 5. A pressure sensor can be arranged 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 arranged 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.

[0068] 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 nozzle of the connecting pipe 5, and the extension rod 33 is slidably arranged on the probe rod 32;

[0069] A locking rod 34 for locking the upper fixing seat 8 is provided on the probe rod 32 .

[0070] Specifically, the probe rod 32 is radially slidably arranged in the active cavity 31, and a bevel block 38 is arranged at the end of the locking rod 34. A clamping member 35 that unidirectionally slides with the bevel block 38 is linearly arranged in the active cavity 31. The elastic member 36 is located between the extension rod 33 and the probe rod 32. The extension rod 33 is provided with an inclined surface that slides 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 clamp 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 the extension rod 33, so that the elastic member 36 contracts, and the extension rod 33 moves downward relative to the probe rod 32 under the guiding sliding of the inclined surface, so that the inclined block 38 and the clamp 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, thereby limiting the continued rotation of the connecting pipe 5 and avoiding further deformation of the connecting pipe 5.

[0071] As another embodiment further provided by the present invention, a lower fixing seat 81 is disposed on the upper fixing seat 8 , and a sliding block 85 for pushing the probe rod 32 is radially slidably disposed on the lower fixing seat 81 .

[0072] Specifically, the fixing clamp 7 is provided with a cable 72 for pulling the slider 85. Transmission rods 86 are rotatably provided on both sides of the slider 85, and the transmission rod 86 is fixedly connected to the cable 72. A first spring 87 is provided between the slider 85 and the lower fixed seat 81, and the first spring 87 is used to pull the slider 85 to be close to the inner wall of the active cavity 31. After the blocking member 74 is no longer blocked, the fixing clamp 7 deflects under the elastic release of the torsion spring 73, and pulls the cable 72, so that the cable 72 drives the transmission rod 86 to deflect, and the slider 85 slides radially under the deflection of the transmission rod 86, and the slider 85 pushes the probe rod 32 during the sliding process. Among them, the spacing between the active cavity 31 and the connecting tube 5 determines the deflection degree of the fixing clamp 7, thereby generating a change in the pulling of the cable 72, and finally making the slider 85 drive the probe rod 32 to slide radially at different distances, so that the probe rod 32 can be adjusted according to the spacing change between the active cavity 31 and the connecting tube 5, so as to better detect the deformation degree of different connecting tubes 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.

[0073] Only certain exemplary embodiments of the present invention have been described above by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different 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 of the present invention.

Claims

1. A fuel nozzle flow test bench, comprising a test bench (1), characterized in that, include: A fuel injection valve (2) is used to control the opening and closing of a plurality of nozzles, and a movable cavity (31) is provided at the 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 fixed clamp (7) driven to deflect toward the outer wall of the connecting pipe (5), and a clamping space with adjustable angle is formed between the fixed clamp (7) and the pressing rod (6), and an arc rod (71) is rotatably provided at the end of the fixed clamp (7), the fixed clamp (7) is rotatably provided on the pressing rod (6), and a torsion spring (73) is provided between the fixed clamp (7) and the pressing rod (6) for maintaining the fixed clamp at a predetermined angle; A pressing block (82) is radially slidably arranged, and there is an unlocking position in the movable stroke of the pressing rod (6) to enable the pressing block (82) to move.

2. The fuel nozzle flow test bench according to claim 1, wherein, It also includes a latching tooth (64) that cooperates with the fixing clamp (7) for unidirectional rotation; A rotating member (66) is rotatably arranged and is in blocking contact with the pressing rod (6), and is provided with a hooking portion (69) for the position limiting fixing clamp (7); It also includes a fixed block (62) fixedly arranged on the pressure rod (6) and a stopper (74) fixedly arranged on the fixing clamp (7); a rotating member (66) is rotatably arranged on the mounting shell (63); a latching tooth (64) is slidably arranged on the mounting shell (63); and a pressure portion (67) is arranged at the end of the rotating member (66) close to the pressure rod (6).

3. The fuel nozzle flow test bench according to claim 2, 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 position is staggered with the slots.

4. The fuel nozzle flow test bench according to claim 3, characterized in that, It also comprises an upper fixed seat (8) for sliding the pressure block (82), 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) keep synchronous movement.

5. The fuel nozzle flow test bench according to claim 2, 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).

6. The fuel nozzle flow test bench according to claim 4, characterized in that, It also comprises 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 arranged for bringing the extension rod (33) close to the pipe mouth.

7. A fuel nozzle flow test bench according to claim 6, 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).

8. A fuel nozzle flow test bench according to claim 7, characterized in that, The upper fixing seat (8) is provided with a lower fixing seat (81), and a slider (85) for pushing the probe rod (32) is provided on the lower fixing seat (81) in a radially sliding manner, and a pull rope (72) for pulling the slider (85) is provided on the fixing clamp (7).

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