Non-uniformity measuring equipment for fuel nozzle

Abstract

The utility model discloses non-uniformity measuring equipment for a fuel nozzle, relates to the field of engine combustion chamber tests, and aims to solve the problem that fuel is attached or hung on a wall at a fuel collection position during measurement. The measuring equipment comprises a frame body; a plurality of distribution blades are arranged on the uniform distribution disc in the circumferential direction of the uniform distribution disc, and the uniform distribution disc is uniformly divided into a plurality of fan-shaped fuel oil collecting openings in the circumferential direction; the collectors of a plurality of funnel structures are arranged at one end, far away from the fuel oil collecting ports, of the equipartition plate, the top of each collector is correspondingly communicated with one fuel oil collecting port, and the bottom of each funnel structure is provided with a first opening for fuel oil to flow out; the collection disc and the uniform distribution disc are sequentially arranged on the frame body at intervals from bottom to top, a plurality of measuring cups used for reading and receiving the volume of fuel oil flowing out of the corresponding first openings are arranged on the collection disc, and each measuring cup corresponds to one first opening. Fuel oil is evenly distributed into each collector through the evenly distributing disc, flows out of the first opening and is collected in each corresponding measuring cup on the collecting disc, and attachment or wall hanging of the fuel oil to the collectors is reduced through the funnel structure.

Description

Technical Field

[0001] The utility model relates to the field of engine combustion chamber testing, in particular to a fuel injection nozzle unevenness measuring device. Background Art

[0002] The combustion chamber is the core component of the fuel engine, and the fuel nozzle is an important component of the fuel engine. The fuel is sprayed and atomized (liquid becomes liquid mist in a gas environment under the action of external energy) and then burned to generate the propulsion power required by the engine. The fuel spray torch ejected from the nozzle is in the shape of a hollow cone. It is composed of many fine droplets suspended in the surrounding air or moving in it. The spatial distribution characteristics and other spray quality have a great influence on the ignition performance of the combustion chamber and emission pollution indicators. Reducing the unevenness of the circumferential distribution of the fuel atomization, improving the atomization quality of the fuel, making it more fully mixed with the air, and reducing carbon deposition can ensure combustion stability and fuel utilization.

[0003] At present, in the fuel nozzle performance test, the unevenness of fuel distribution is measured to screen out qualified fuel nozzles with unevenness ≤ 20%. In the existing measuring equipment, the components for collecting the distributed fuel are prone to accumulation of fuel, which affects the measurement results. Utility Model Content

[0004] The utility model aims to provide a fuel nozzle unevenness measuring device, which is used to reduce fuel accumulation during measurement and improve measurement accuracy.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: a fuel nozzle unevenness measuring device, comprising:

[0006] Frame;

[0007] An equalizing plate is arranged on the frame, and a plurality of distribution blades are arranged along the circumference of the equalizing plate, and the distribution blades are used to divide the equalizing plate into a plurality of fan-shaped fuel collecting ports along the circumferential direction;

[0008] A plurality of concentrators are arranged at one end of the equalizing plate away from the fuel collecting port, the top of each concentrator is connected to a corresponding fuel collecting port, the concentrator is a funnel structure, and the bottom of the funnel structure has a first opening, and the first opening is used to flow out the fuel;

[0009] The collecting tray and the equalizing tray are arranged on the frame in sequence from bottom to top. A plurality of measuring cups are arranged on the supporting surface of the collecting tray, each measuring cup corresponds to a first opening, and each measuring cup is used to read the volume of fuel flowing out of the corresponding first opening.

[0010] Optionally, in the above-mentioned fuel nozzle unevenness measurement device, the averaging disk and the plurality of concentrators are an integrally formed structure;

[0011] Alternatively, the dividing plate is welded to a plurality of concentrators.

[0012] Optionally, in the above-mentioned fuel nozzle unevenness measuring device, the end cross-sectional area of ​​the measuring cup is larger than the cross-sectional area of ​​the first opening.

[0013] Optionally, in the above fuel nozzle unevenness measuring device, the frame comprises:

[0014] A first support plate is arranged at one end of the first support column away from the collecting plate, and the first support plate is used to suspend the dividing plate;

[0015] A plurality of first support columns, one end of which is connected to a surface of the first support plate close to the collection tray;

[0016] A second support plate is arranged at the bottom of the collection tray, the second support plate and the first support plate are supported and connected by a first support column, and the second support plate is used to place the collection tray;

[0017] A plurality of second support columns are arranged on a side of the second support plate away from the first support plate, and the plurality of second support columns are used to support the second support plate on the ground.

[0018] Optionally, in the above-mentioned fuel nozzle unevenness measuring device, a guide groove is provided on one side of the second support plate close to the collecting tray, and a limit member is provided at the bottom of the collecting tray. The limit member is embedded in the guide groove, and the limit member is used for guiding movement along the guide groove.

[0019] Optionally, in the above-mentioned fuel nozzle unevenness measuring device, a first baffle is provided at the edge of the second support plate, and a second baffle is provided at the edge of the collecting plate, and both the first baffle and the second baffle are used to prevent fuel from leaking out;

[0020] Optionally, in the above-mentioned fuel nozzle unevenness measuring device, the second support plate is provided with a first through hole, the collecting plate is provided with a second through hole, the measuring device also includes an oil collecting pipe, the first through hole and the second through hole are both connected to the oil collecting pipe, and the oil collecting pipe is used for fuel recovery.

[0021] Optionally, in the above fuel nozzle unevenness measuring device, the frame further includes:

[0022] A plurality of third support columns, one end of each of the third support columns is disposed on a side of the first support plate away from the second support plate;

[0023] The third support plate is arranged with the first support plate in sequence from top to bottom, and the third support plate is supported and connected to the first support plate by a third support column, and is used to communicate with the fuel nozzle.

[0024] Optionally, in the above-mentioned fuel nozzle unevenness measuring device, the third support column is a retractable column.

[0025] Optionally, the above-mentioned fuel nozzle unevenness measuring device further includes a protective component, and the protective component cover is arranged outside the frame.

[0026] Compared with the prior art, when the above technical solution is adopted, the fuel nozzle of the fuel engine to be measured is installed at one end of the equalizing plate. When the measurement starts, the fuel passes through multiple distribution blades and then is divided into each concentrator through multiple fuel collection ports. The fuel collected in each concentrator flows out through the first opening and is collected in each corresponding measuring cup on the collecting plate. Compared with the traditional measuring equipment with a flat bottom structure in the concentrator part, the present application uses a funnel-structured concentrator to reduce the probability of oil accumulation, reduce the adhesion or wall hanging of the fuel at the concentrator during measurement, and improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0028] Figure 1 It is a schematic diagram of the overall structure of a fuel nozzle unevenness measuring device provided in an embodiment of the utility model;

[0029] Figure 2 A top view of the partial structure of a fuel nozzle unevenness measuring device provided in an embodiment of the utility model;

[0030] Figure 3 A cross-sectional view of an averaging plate, a collector and a measuring cup of a fuel nozzle unevenness measuring device provided in an embodiment of the utility model;

[0031] Figure 4 for Figure 1 A magnified view of the local structure in

[0032] Figure 5 A schematic diagram of the structure of an averaging disk and a concentrator of a fuel nozzle unevenness measurement device provided in an embodiment of the utility model;

[0033] Figure 6 for Figure 5 A top view of

[0034] Figure 7 for Figure 5 Front view of .

[0035] Reference numerals:

[0036] 1-frame; 11-first support plate; 12-first support column; 13-second support plate; 131-guide groove; 132-first baffle; 133-first through hole; 14-second support column; 15-third support column; 16-third support plate; 161-second opening; 17-fourth support column; 2-equalizing plate; 21-distribution blades; 22-fuel collecting port; 3-aggregator; 31-first opening; 4-collecting plate; 41-measuring cup; 42-second baffle; 43-second through hole; 5-oil collecting pipe; 6-pull rod. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] like Figure 1-Figure 7 As shown, an embodiment of the utility model provides a fuel nozzle unevenness measuring device, hereinafter referred to as the measuring device, which includes: a frame 1, an averaging plate 2, a collector 3 and a collecting plate 4.

[0043] Among them, the equalizing plate 2 is arranged on the frame 1, and the equalizing plate 2 is provided with a plurality of distribution blades 21 along its circumference, and the distribution blades 21 are used to divide the equalizing plate 2 into a plurality of fan-shaped fuel collecting ports 22 along the circumferential direction; a plurality of collectors 3 are arranged at one end of the equalizing plate 2 away from the fuel collecting port 22, and the top of each collector 3 is connected to a corresponding fuel collecting port 22, and the collector 3 is a funnel structure, and the bottom of the funnel structure has a first opening 31, and the first opening 31 is used to flow out the fuel; the collecting plate 4 and the equalizing plate 2 are arranged on the frame 1 in sequence from bottom to top, and a plurality of measuring cups 41 are arranged on the supporting surface of the collecting plate 4, and each measuring cup 41 corresponds to a first opening 31, and each measuring cup 41 is used to read the volume of fuel flowing out of the corresponding first opening 31.

[0044] When implementing it, Figure 1As shown, the fuel supply system is started to atomize the fuel of the fuel engine to be measured through the fuel nozzle. When the measurement starts, the atomized fuel passes through the multiple distribution blades 21 on the averaging plate 2, and is correspondingly diverted from the multiple fuel collection ports 22 to each concentrator 3. The liquefied fuel is collected in each concentrator 3 and flows out through the first opening 31, and is collected in each corresponding measuring cup 41 on the collecting plate 4. Compared with the traditional measuring equipment with a flat bottom structure at the concentrator 3, see the relevant description of Chinese patent CN202305220U. The present application uses a concentrator 3 with a funnel structure to facilitate the fuel to slide to the first opening 31, reduce the accumulation and adhesion in the concentrator 3, reduce the probability of oil storage, and improve the measurement accuracy. When the specified time is reached, the measuring cup 41 is disconnected from the oil circuit, and the volume value of the fuel collected in each measuring cup 41 is read. If N measuring cups 41 are used, the sum of the fuel volumes in the N measuring cups 41 is divided by N to obtain the average value δ of the fuel volume. Then, the maximum value of the fuel volume in the N measuring cups 41 is subtracted from the minimum value of the fuel volume in the N measuring cups 41, and the resulting difference ε is divided by the average value δ of the fuel volume flow rate to obtain the unevenness of the fuel volume flow rate. If the calculated unevenness is less than or equal to 20%, it is a qualified fuel nozzle. If the calculated unevenness is greater than 20%, it is an unqualified fuel nozzle.

[0045] Exemplarily, the dividing plate 2 is evenly divided into 3, 8, 9, 12, 16, etc. fan-shaped fuel collecting ports 22 along the circumferential direction. The number of the fuel collecting ports 22 is not specifically limited, as long as the number of the fuel collecting ports 22 meets the measurement requirements. When the number of the fuel collecting ports 22 is 3, the dividing plate 2 has 3 distribution blades 21, and a total of 3 collectors 3 are provided for each fuel collecting port 22, and 3 corresponding measuring cups 41 are also provided; when the number of the fuel collecting ports 22 is 15, the dividing plate 2 has 16 distribution blades 21, and a total of 16 collectors 3 are provided for each fuel collecting port 22, and 16 corresponding measuring cups 41 are also provided. The number of each component is not specifically limited, as long as the number of each component corresponds one to one. The operator only needs to customize the equalizing plate 2 with different equalizing amounts according to the measurement requirements and replace the number of measuring cups 41 in the collecting plate 4 to meet the measurement requirements. The measuring equipment has high flexibility in use, strong interchangeability, low production cost and short production cycle.

[0046] Specifically, in this embodiment, the cone angle of the funnel structure is 45° to 60°. The cone angle may be 45°, 50°, 57°, 60°, etc. The cone angle is not specifically limited here, as long as the funnel structure has a slope surface that allows the fuel to smoothly slide to the first opening 31 without adhesion and accumulation.

[0047] Specifically, in this embodiment, the dividing disk 2 and the multiple concentrators 3 are integrally formed. The dividing disk 2 and the multiple concentrators 3 are integrally formed by laser selective melting technology. The parts formed by laser selective melting technology have good density, can form high-precision complex special-shaped metal parts, and have the advantages of high dimensional accuracy, good surface quality, high density and high organizational performance. The material used is stainless steel with good corrosion resistance, which shortens the manufacturing cycle and reduces the production cost.

[0048] In other embodiments, the averaging tray 2 is welded to the plurality of aggregators 3. Welding the averaging tray 2 and the plurality of aggregators 3 together reduces the risk of leakage during the fuel collection process and facilitates installation.

[0049] like Figure 3 As shown, specifically, in this embodiment, the end cross-sectional area of ​​the measuring cup 41 is larger than the cross-sectional area of ​​the first opening 31. The end cross-sectional area of ​​the measuring cup 41 is larger than the cross-sectional area of ​​the first opening 31, which facilitates the majority of the fuel flowing out from the first opening 31 to fall into the corresponding measuring cup 41 for collection, reduces the splashing of fuel during the collection process, and ensures the accuracy of the measurement.

[0050] like Figure 1 As shown, specifically, in this embodiment, the frame 1 includes: a first support plate 11, a plurality of first support columns 12, a second support plate 13 and a plurality of second support columns 14, the first support plate 11 is arranged at the end of the first support column 12 away from the collection tray 4, the first support plate 11 is used to suspend the equalizing tray 2, one end of each first support column 12 is connected to a side of the first support plate 11 close to the collection tray 4, the second support plate 13 is arranged at the bottom of the collection tray 4, the second support plate 13 and the first support plate 11 are supported and connected by the first support column 12, the second support plate 13 is used to place the collection tray 4, a plurality of second support columns 14 are arranged on a side of the second support plate 13 away from the first support plate 11, and a plurality of second support columns 14 are used to support the second support plate 13 on the ground. The frame 1 realizes the suspended support of the equalizing plate 2 through the first support plate 11, and realizes the horizontal placement of the collecting plate 4 through the second support plate 13, so that the fuel can flow out smoothly from the first opening 31 of the collector 3 during the collection process, and the measuring cup 41 on the collecting plate 4 is placed at the corresponding position below for direct collection, thereby improving the measurement efficiency. Among them, the first support column 12 can be provided with 2, 3, 4, etc., and the second support column 14 can be provided with 2, 3, 4, etc., and the number of the first support column 12 and the number of the second support column 14 are not specifically limited here, as long as the first support column 12 and the second support column 14 meet the support requirements to ensure the stability of the structure.

[0051] In other embodiments, the second support column 14 is an anchor bolt, and the operator can adjust the anchor bolt to keep the entire measuring device level.

[0052] Specifically, in this embodiment, a guide groove 131 is provided on one side of the second support plate 13 close to the collection tray 4, and a limiter is provided at the bottom of the collection tray 4. The limiter is embedded in the guide groove 131, and the limiter is used to guide along the guide groove 131. The length of the guide groove 131 is not specifically limited here, as long as the guide groove 131 is able to drive the measuring cup 41 on the collection tray 4 to be misaligned with the first opening 31 after the limiter moves, so that the oil circuit is disconnected. Exemplarily, the limiter can be a limiter block, a limiter column, or other structure that can be embedded in the wire groove to realize the limiter function, and the limiter is not specifically limited here.

[0053] like Figure 2 As shown, specifically, in this embodiment, a pull rod 6 is provided on the collection tray 4, and the pull rod 6 is used to pull the collection tray 4 to slide relatively along the second support plate 13. The operator can hold the pull rod 6 and pull it outward to make the limiter at the bottom of the collection tray 4 slide along the guide groove 131 until the measuring cup 41 on the collection tray 4 is completely misaligned with the first opening 31, and then stop pulling. At this time, the measuring cup 41 is disconnected from the oil circuit, and the operator can read the volume value of the fuel collected in each measuring cup 41 and calculate the unevenness.

[0054] like Figure 1 and Figure 4 As shown, specifically, in this embodiment, a first baffle 132 is provided at the edge of the second support plate 13, and a second baffle 42 is provided at the edge of the collection tray 4. Both the first baffle 132 and the second baffle 42 are used to prevent the leakage of fuel. When the fuel drips from the first opening 31, most of the fuel flows into the measuring cup 41 for collecting and measuring the unevenness, and a small part of the fuel splashes out of the measuring cup 41. The fuel splashed and dripped into the collection tray 4 is blocked by the second baffle 42 and gathered in the collection tray 4; the fuel splashed and dripped into the second support plate 13 is blocked by the first baffle 132 and gathered in the second support plate 13, thereby avoiding the splashing of fuel during the measurement process.

[0055] like Figure 1 and Figure 2 As shown, specifically, in this embodiment, the second support plate 13 is provided with a first through hole 133, the collecting plate 4 is provided with a second through hole 43, and the measuring device further includes an oil collecting pipe 5, the first through hole 133 and the second through hole 43 are both connected to the oil collecting pipe 5, and the oil collecting pipe 5 is used for fuel recovery. There are two oil collecting pipes 5, one of which is used to communicate with the first through hole 133 to recover the fuel splashed in the second support plate 13; the other oil collecting pipe 5 is used to communicate with the second through hole 43 to recover the fuel splashed in the collecting plate 4, thereby reducing resource waste.

[0056] like Figure 1As shown, specifically, in this embodiment, the frame 1 also includes a plurality of third support columns 15 and a third support plate 16, one end of each third support column 15 is arranged on a side of the first support plate 11 away from the second support plate 13, the third support plate 16 and the first support plate 11 are arranged in sequence from top to bottom, and the third support plate 16 and the first support plate 11 are supported and connected by the third support column 15, and are used to communicate with the fuel nozzle. Among them, the third support plate 16 is provided with a second opening 161, and the third support plate 16 is connected with the fuel nozzle through the second opening 161. When working, the operator fixes the fuel nozzle on the third support plate 16, and the fuel nozzle sprays fuel to the equalizing plate 2 on the first support plate 11, so that the position of the fuel nozzle is fixed and does not shift during the process of spraying fuel, thereby reducing the influence of the unevenness of the equipment measurement.

[0057] like Figure 1 As shown, specifically, in this embodiment, a plurality of fourth support columns 17 are provided on one side of the third support plate 16 away from the first support plate 11, and the fourth support columns 17 are used to support the fuel nozzle. Among them, the fourth support columns 17 can be provided with 2, 3, 5, etc., and the number of the fourth support columns 17 is not specifically limited, as long as the fourth support columns 17 meet the requirements of supporting and fixing the fuel nozzle.

[0058] like Figure 1 As shown, specifically, in this embodiment, the diameter of the second support column 14 is greater than the diameter of the first support column 12, and the diameter of the first support column 12 is greater than the diameter of the third support column 15. The support pressure near the bottom of the frame 1 is greater, and the second support column 14 with a larger diameter is selected; the support pressure near the top of the frame 1 is smaller, and the third support column 15 with a smaller diameter is selected, which facilitates the installation of the measuring equipment and ensures the structural stability of the overall equipment.

[0059] Specifically, in this embodiment, the third support column 15 is a retractable column. The effective height that the retractable column can adjust is 90mm to 180mm. For example, the length of the retractable column can be 90mm, 100mm, 113mm, 136mm, 150mm, 165mm, 180mm, etc. The support length of the retractable column is not specifically limited. When working, the operator only needs to adjust the support height of the third support plate 16 and the first support plate 11 through the retractable connection of the third support column 15 to complete the distance adjustment between the fuel nozzle and the equalizing plate 2, which is convenient for operation, so that the measuring device meets the requirements of different measuring heights, and improves the turnover and flexibility of use of the measuring device.

[0060] Specifically, in the present embodiment, the measuring device further comprises a protective component, and the protective component is covered outside the frame 1. The protective component is used to block the fuel splashed during the measurement process and isolate the fuel spray from polluting the external environment. Among them, the protective component is installed with an opening and closing door on the side close to the pull rod 6, which improves the flexibility of the connection between the protective component and the frame 1 and reduces the wear on the surface of the frame 1 during the repeated covering and removal of the protective component. When the specified time is reached and the measuring cup 41 needs to be disconnected from the oil circuit, the operator only needs to open the opening and closing door, pull the pull rod 6 so that the corresponding position of the measuring cup 41 is relatively staggered with the position of the first opening 31, and read and calculate the collected fuel volume; when the measurement is completed, the operator pushes the pull rod 6 to the initial position and closes the opening and closing door to complete the storage of the measuring equipment for easy operation.

[0061] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0062] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A fuel nozzle unevenness measuring device, characterized in that: include: Frame; An equalizing plate is arranged on the frame, and a plurality of distribution blades are arranged along the circumference of the equalizing plate, and the distribution blades are used to divide the equalizing plate into a plurality of fan-shaped fuel collecting ports along the circumferential direction; A plurality of concentrators are arranged at one end of the equalizing plate away from the fuel collecting port, the top of each concentrator is connected to a corresponding fuel collecting port, the concentrator is a funnel structure, the bottom of the funnel structure has a first opening, and the first opening is used to flow out the fuel; The collecting plate and the equal distribution plate are arranged on the frame in sequence from bottom to top, and a plurality of measuring cups are arranged on the supporting surface of the collecting plate, each of which corresponds to one of the first openings, and each of the measuring cups is used to read the volume of fuel flowing out of the corresponding first opening.

2. The fuel nozzle unevenness measuring device according to claim 1, characterized in that: The dividing plate and the plurality of concentrators are an integrally formed structure; Alternatively, the dividing plate is welded to the plurality of concentrators.

3. The fuel nozzle unevenness measuring device according to claim 1, characterized in that: The end cross-sectional area of ​​the measuring cup is larger than the cross-sectional area of ​​the first opening.

4. The fuel nozzle unevenness measuring device according to claim 1, characterized in that: The frame comprises: A first support plate, wherein the first support plate is used to support the equalizing plate in mid-air; A plurality of first support columns, one end of which is connected to a surface of the first support plate close to the collection tray; A second support plate is disposed at the bottom of the collection tray, the second support plate is connected to the first support plate through the first support column, and the second support plate is used to place the collection tray; A plurality of second support columns are arranged on a side of the second support plate away from the first support plate, and the plurality of second support columns are used to support the second support plate on the ground.

5. The fuel nozzle unevenness measuring device according to claim 4, characterized in that: A guide groove is arranged on one side of the second support plate close to the collecting tray, and a limiting member is arranged on the bottom of the collecting tray. The limiting member is embedded in the guide groove, and the limiting member is used for guiding movement along the guide groove.

6. The fuel nozzle unevenness measuring device according to claim 4, characterized in that: A first baffle is disposed at an edge of the second support plate, and a second baffle is disposed at an edge of the collecting plate. Both the first baffle and the second baffle are used to prevent fuel from leaking out.

7. The fuel nozzle unevenness measuring device according to claim 4, characterized in that: The second support plate is provided with a first through hole, the collecting plate is provided with a second through hole, the measuring device further comprises an oil collecting pipe, the first through hole and the second through hole are both connected to the oil collecting pipe, and the oil collecting pipe is used for fuel recovery.

8. The fuel nozzle unevenness measuring device according to claim 4, characterized in that: The frame also includes: A plurality of third support columns, one end of each of the third support columns being disposed on a side of the first support plate away from the second support plate; The third support plate is arranged in sequence with the first support plate from top to bottom, and the third support plate is supported and connected to the first support plate through the third support column, and is used to communicate with the fuel nozzle.

9. The fuel nozzle unevenness measuring device according to claim 8, characterized in that: The third supporting column is a telescopic column.

10. The fuel nozzle unevenness measuring device according to claim 1, characterized in that: It also includes a protective component, which is covered outside the frame.

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