Fuel oil distribution non-uniformity detection device and use method thereof

Abstract

The invention discloses a fuel oil distribution unevenness detection device and a use method thereof, and belongs to the technical field of part detection. The lower end of the bottom plate is connected with the supporting column, the upper end of the bottom plate is connected with the lower coaming, the middle of the bottom plate is connected with the core column, the lower coaming is connected with the upper coaming, the core column is connected with the flow divider, and the middle of the flow divider is connected with the conical tip in an inserted mode. An oil passing channel is formed between every two adjacent vertical partition plates, the lower end face of the bottom plate is communicated with oil nozzles, the oil nozzles are communicated with the oil passing channels, and anti-explosion oil pipes are inserted into the outer sides of the oil nozzles. The volume of a matched clamp is reduced, the manufacturing cost is reduced, the operation labor intensity is reduced, the flow dividing precision is improved, micro flow differences can be accurately recognized, three-dimensional flow field reconstruction and non-contact full-field observation are achieved, and the personal error rate is reduced.

Description

Technical Field

[0001] The present invention relates to a fuel distribution non-uniformity detection device and a method for using the same, belonging to the technical field of part detection. Background Art

[0002] In the existing fuel distribution non-uniformity detection device, due to the over-large design of the positioning diameter and the size of the positioning surface, the overall volume of the supporting connection fixture has increased significantly, which not only increases the labor intensity of the operator during disassembly, but also raises the manufacturing cost due to the increase in the amount of fixture material used and the processing complexity.

[0003] At the same time, due to the limited fuel flow rate, the accuracy of the flow splitting area during the detection process directly affects the reliability of the non-uniformity measurement. However, due to the design defects of the flow channel in the existing device, it is difficult to accurately identify the tiny flow rate differences, resulting in insufficient detection accuracy.

[0004] In addition, the height design of the original flow splitting cone tip relative to the positioning surface is unreasonable. To meet the distance requirement between the spray hole and the cone tip, the fixture needs to adopt an embedded structure to penetrate deep into the detection device, which further exacerbates the observation blind area and makes it difficult to monitor the fuel flow state in real time. Summary of the Invention

[0005] To solve the problems in the background art, the present invention provides a fuel distribution non-uniformity detection device and a method for using the same.

[0006] To achieve the above object, the present invention adopts the following technical solution: A fuel distribution non-uniformity detection device includes a cover plate, a backing plate, an upper enclosing plate, a flow splitter, vertical partition plates, a lower enclosing plate, a bottom plate, a cone tip, a core column, support columns, and oil nozzles; the lower end of the bottom plate is fixedly connected to the upper ends of a plurality of support columns, the upper end of the bottom plate is fixedly connected to the lower end of the lower enclosing plate, the upper end of the lower enclosing plate is fixedly connected to the lower end of the upper enclosing plate, the middle part of the bottom plate is fixedly connected to the lower end of the core column, the upper end of the core column is fixedly connected to the middle part of the lower end surface of the flow splitter, the middle part of the upper end surface of the flow splitter is in interference fit with the lower end of the cone tip, a ring-shaped backing plate is placed on the upper end of the flow splitter, a ring-shaped cover plate is placed on the upper end of the backing plate, and the cover plate is used for assembling the fixture of the part to be detected; the lower end of the flow splitter is inserted and fixedly connected to the upper ends of a plurality of vertical partition plates, the lower end of each vertical partition plate is inserted and fixedly connected to the bottom plate, an oil passage is formed between every two adjacent vertical partition plates, the lower end surface of the bottom plate is communicated with a plurality of oil nozzles, each oil nozzle is respectively communicated with the corresponding oil passage, and an explosion-proof oil pipe is in interference fit with the outside of each oil nozzle.

[0007] The flow splitter includes an outer ring body and a plurality of flow splitting blocks uniformly distributed radially from the center to the outer ring body. Each flow splitting block is an isosceles triangular pyramid, and an oil passage is formed between every two adjacent flow splitting blocks. The lower end of each flow splitting block is respectively inserted and fixedly connected to the upper end of the corresponding vertical partition plate.

[0008] The upper surface of the bottom plate is provided with a plurality of wedge-shaped blocks, and the plurality of wedge-shaped blocks are arranged in one-to-one correspondence with a plurality of oil passage channels. A vertical partition is inserted into the gap between every two adjacent wedge-shaped blocks, and the outer side wall of each wedge-shaped block is in clearance fit with the inner wall of the lower surrounding plate; an oil passage hole is provided on the outer side of each wedge-shaped block, and each of the oil passage holes is threadedly connected with a corresponding oil nozzle; each wedge-shaped block has a guiding surface with an inclination angle of 5°-15°, and the height of the guiding surface gradually decreases from the inside to the outside along the radial direction of the bottom plate.

[0009] A plurality of pressure sensors are evenly distributed on the upper surface of the cover plate along its circumferential direction. After the fixture is positioned, the uniformity of the force at each point is detected by the pressure sensors.

[0010] Vertical flow guiding grooves are provided on both side walls of each vertical partition, and the depth of each flow guiding groove increases from top to bottom.

[0011] A detachable flow guiding cap is provided at the top of the conical tip, and guide grooves extending along the radial direction of the flow guiding cap are distributed on the surface of the flow guiding cap.

[0012] An ultrasonic flowmeter is integrated at the oil outlet end of each explosion-proof oil pipe.

[0013] A method for using a fuel distribution non-uniformity detection device according to the present invention, the method comprising the following steps:

[0014] S1: Install the part to be detected at the positioning diameter of the cover plate through a positioning fixture, ensure that the coaxiality between the fuel injection hole of the part nozzle and the axis of the conical tip is ≤0.05 mm, and detect the force uniformity at each point in real time through the pressure sensor. When the force value deviation at any point exceeds the set threshold, an alarm is triggered;

[0015] S2: Start the fuel supply system. The fuel forms a columnar jet through the fuel injection hole of the nozzle and impacts the flow guiding cap. The first uniform dispersion is realized through the guide grooves on its surface, and the dispersed fuel is secondarily divided along the isosceles triangular pyramid flow guiding surface of the flow dividing block;

[0016] S3: The fuel after double flow division enters the oil passage channels formed by the vertical partitions. The flow guiding grooves of the vertical partitions guide the fuel to form a laminar flow state, reducing the influence of turbulent flow on the measurement accuracy;

[0017] S4: The fuel in each oil passage channel enters the measurement section of the ultrasonic flowmeter through the explosion-proof oil pipe. The measurement points of the annular array of the ultrasonic flowmeter synchronously collect the flow velocity data, and a three-dimensional flow velocity field model is constructed by using the time difference method algorithm. The flow velocity distribution cloud map of each cross section is displayed through the device viewer;

[0018] S5: After the detection data is processed by the analysis terminal, an unevenness evaluation report is automatically generated.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The present invention optimizes the distance from the cone tip to the positioning surface, enabling the fixture to get rid of the embedded deep structure, reducing the volume of the supporting fixture body, lowering the manufacturing cost, and significantly reducing the operating labor intensity. A multiple flow splitting system is formed by the flow guiding groove of the flow guiding cap, the radially arranged triangular pyramid flow splitting block, the flow guiding grooves with gradually increasing depths on both sides of the vertical partition plate, and the wedge-shaped block with an inclined guiding surface. In combination with a surface roughness Ra ≤ 1.6 μm, the flow splitting accuracy is improved, and minute flow rate differences can be accurately identified. Through the measurement by the ultrasonic flowmeter annular array, not only is the observation blind area limitation of traditional embedded monitoring broken through, but also three-dimensional flow field reconstruction and non-contact full-field observation are achieved. In addition, the pressure sensor array automatically verifies the positioning accuracy of the fixture, reducing the human error rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural view of the present invention;

[0022] Figure 2 is Figure 1 the A-A sectional view of;

[0023] Figure 3 is Figure 1 the B-B sectional view of;

[0024] Figure 4 is a schematic structural view of the cover plate;

[0025] Figure 5 is Figure 4 the sectional view of;

[0026] Figure 6 is a schematic structural view of the backing plate;

[0027] Figure 7 is Figure 6 the sectional view of;

[0028] Figure 8 is a schematic structural view of the upper shroud;

[0029] Figure 9 is Figure 8 the sectional view of;

[0030] Figure 10 is a schematic structural view of the flow splitter;

[0031] Figure 11 is Figure 10 the C-C sectional view of;

[0032] Figure 12 is Figure 10 the D-D sectional view of;

[0033] Figure 13It is a schematic structural diagram of the lower side plate;

[0034] Figure 14 It is Figure 13 a sectional view of;

[0035] Figure 15 It is a schematic structural diagram of the bottom plate;

[0036] Figure 16 It is Figure 15 the sectional view taken along line E-E of;

[0037] Figure 17 It is a schematic structural diagram of the cone tip; Specific embodiments

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0039] A fuel distribution non-uniformity detection device includes a cover plate 1, a backing plate 2, an upper shroud 3, a fluid splitter 4, a vertical partition 5, a lower shroud 6, a bottom plate 7, a conical tip 8, a core column 9, a support column 10, and a fuel nozzle 11. The lower end of the bottom plate 7 is fixedly connected by welding to the upper ends of a plurality of support columns 10 evenly distributed along its circumference. The upper end of the bottom plate 7 is fixedly connected by welding to the lower end of the lower shroud 6. The upper end of the lower shroud 6 is fixedly connected by welding after being assembled with an interference fit to the lower end of the upper shroud 3. The middle of the bottom plate 7 is fixedly connected by welding to the lower end of the core column 9. The upper end of the core column 9 is fixedly connected by welding to the middle of the lower end face of the fluid splitter 4. The middle of the upper end face of the fluid splitter 4 is inserted with an interference fit to the lower end of the conical tip 8. Since the distance for most fuel nozzles to detect fuel distribution non-uniformity is generally 50 mm or 55 mm, the distance from the highest point of the conical tip 8 of the present invention to the upper surface of the backing plate 2 is designed to be 48 mm, which is convenient for the design of the fixture for assembling parts and avoids the fixture being too large. The accuracy of the fluid splitter is also strict to ensure the detection accuracy. A backing plate 2 with an annular structure is placed on the upper end of the fluid splitter 4. A cover plate 1 with an annular structure is placed on the upper end of the backing plate 2. The upper end face of the cover plate 1 is a positioning surface, and a positioning diameter is provided at the center for assembling the fixture of the part to be detected. The outer walls of the cover plate 1, the backing plate 2, and the fluid splitter 4 are all in clearance fit with the inner wall of the upper shroud 3. The lower end of the fluid splitter 4 is inserted and fixed to the upper ends of a plurality of vertical partitions 5. The lower end of each vertical partition 5 is inserted and fixed to the bottom plate 7. An oil passage 14 is formed between every two adjacent vertical partitions 5. The lower end face of the bottom plate 7 is threadedly connected and communicated with a plurality of fuel nozzles 11 evenly distributed along its circumference. Each fuel nozzle 11 is communicated with the corresponding oil passage 14. An explosion-proof oil pipe 13 is inserted with an interference fit outside each fuel nozzle 11. The oil outlet ends of each explosion-proof oil pipe 13 are respectively arranged corresponding to the corresponding equipment electronic scale and are connected to the equipment fuel tank to realize oil return. Or the oil outlet ends of each explosion-proof oil pipe 13 are respectively inserted into the corresponding measuring cups to make the observation of non-uniformity more intuitive.

[0040] The fluid splitter 4 includes an outer ring body 401 and a plurality of flow splitting blocks 402 evenly distributed radially from the center to the outer ring body. Each flow splitting block 402 extends outward from the center, and its outer end is fixedly connected to the inner wall of the outer ring body 401, and its inner end converges at the central axis of the fluid splitter. Each flow splitting block 402 is an isosceles triangular pyramid. An oil passage 14 is formed between every two adjacent flow splitting blocks 402. The lower end of each flow splitting block 402 is respectively inserted and fixed to the upper end of the corresponding vertical partition 5.

[0041] The upper surface of the bottom plate 7 is provided with a plurality of integrally formed wedge-shaped blocks 701, and the plurality of wedge-shaped blocks 701 are arranged in one-to-one correspondence with a plurality of oil passageways 14. A vertical partition plate 5 is inserted into the gap between every two adjacent wedge-shaped blocks 701. The outer side wall of each wedge-shaped block 701 is in clearance fit with the inner wall of the lower surrounding plate 6; an oil hole 702 penetrating the lower surface of the bottom plate 7 is provided on the outer side of each wedge-shaped block 701, and each of the oil holes 702 is threadedly screwed with a corresponding oil nozzle 11; each wedge-shaped block 701 has a guiding surface with an inclination angle of 5°-15°, and the height of the guiding surface gradually decreases from the inside to the outside along the radial direction of the bottom plate 7.

[0042] A plurality of pressure sensors are evenly distributed on the upper surface of the cover plate 1 along its circumferential direction. After the fixture is positioned, the uniformity of the force at each point is detected by the pressure sensors. If the force deviation at a certain point exceeds 10%, the controller triggers an alarm and marks the corresponding area, indicating that the fixture is installed obliquely or the part is deformed.

[0043] Vertical flow guiding grooves are provided on both side walls of each vertical partition plate 5, and the depth of each flow guiding groove increases from top to bottom. The flow guiding grooves can guide the fuel to flow more smoothly in the oil passageway 14, reduce the retention and turbulence of the fuel, and improve the detection accuracy.

[0044] The surface roughness of each vertical partition plate 5 is Ra≤1.6μm, the thickness tolerance of the vertical partition plate 5 is only 0.03mm, and the angle accuracy of each vertical partition plate is relatively strict, ensuring uniform equal division along the circumferential direction of the cone tip.

[0045] A detachable flow guiding cap is provided at the top of the cone tip 8 by threaded screwing or interference fit. Micron-level guiding grooves extending along the radial direction of the flow guiding cap are distributed on the surface of the flow guiding cap. The material of the flow guiding cap is oil-repellent ceramic and is detachably connected to the cone tip 8 by threads to adapt to the fuel detection requirements of different viscosities. At the same time, the micron structure can change the surface tension and wettability of the fuel, make the fuel more evenly dispersed on the cone tip 8, improve the uniformity of the fuel distribution, and evenly disperse the fuel to each oil passageway 14, thereby improving the detection accuracy.

[0046] An ultrasonic flowmeter is integrated at the oil outlet end of each explosion-proof oil pipe 13. Twelve measuring points in an annular array are arranged at the oil outlet end, and the flow velocity distribution is calculated by the time difference method to realize three-dimensional flow field reconstruction.

[0047] A method for using a fuel distribution non-uniformity detection device of the present invention, the method comprising the following steps:

[0048] S1: Install the part to be detected at the positioning diameter of the cover plate 1 through a positioning fixture, ensure that the coaxiality between the fuel injection hole of the part nozzle and the axis of the cone tip 8 is ≤0.05mm, and detect the force uniformity at each point in real time through the pressure sensor. When the force value deviation at any point exceeds the set threshold, an alarm is triggered;

[0049] S2: Start the fuel supply system. The fuel forms a columnar jet through the nozzle orifice and impacts the deflector cap, achieving the first uniform dispersion through the guide grooves on its surface. The dispersed fuel undergoes secondary diversion along the isosceles triangular prism deflector surface of the flow splitter block 402;

[0050] S3: The fuel after double diversion enters the oil passage 14 formed by the vertical partition 5. The guide grooves of the vertical partition 5 guide the fuel to form a laminar flow state, reducing the influence of turbulence on the measurement accuracy;

[0051] S4: The fuel in each oil passage 14 enters the measurement section of the ultrasonic flowmeter through the explosion-proof oil pipe 13. The 12 measurement points in the annular array of the ultrasonic flowmeter synchronously collect the flow velocity data, and a three-dimensional flow velocity field model is constructed using the time-difference method algorithm. The flow velocity distribution cloud map of each cross-section is displayed through the device viewer;

[0052] S5: After the detection data is processed by the analysis terminal, an unevenness evaluation report is automatically generated, including the maximum deviation value, the deviation distribution area, and the recommended improvement direction, supporting dual-format output of PDF / Excel.

[0053] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0054] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fuel distribution unevenness detection device, characterized in that: The invention comprises a cover plate (1), a pad plate (2), an upper enclosure plate (3), a flow divider (4), a vertical partition plate (5), a lower enclosure plate (6), a bottom plate (7), a cone tip (8), a core column (9), a support column (10) and an oil nozzle (11); the lower end of the bottom plate (7) is fixedly connected to the upper ends of a plurality of support columns (10), the upper end of the bottom plate (7) is fixedly connected to the lower end of the lower enclosure plate (6), the upper end of the lower enclosure plate (6) is fixedly connected to the lower end of the upper enclosure plate (3), the middle part of the bottom plate (7) is fixedly connected to the lower end of the core column (9), the upper end of the core column (9) is fixedly connected to the middle part of the lower end surface of the flow divider (4), the middle part of the upper end surface of the flow divider (4) is fixedly connected to the lower end of the cone tip (8), and the lower end of the cone tip (8) is fixedly connected to the lower end of the core column (9). Interference insertion, a ring-shaped pad (2) is placed on the upper end of the flow divider (4), a ring-shaped cover (1) is placed on the upper end of the pad (2), and the cover (1) is used to assemble a fixture for the parts to be tested; the lower end of the flow divider (4) is plugged and fixed with the upper ends of a plurality of vertical partitions (5), the lower end of each of the vertical partitions (5) is plugged and fixed with the bottom plate (7), an oil passage (14) is formed between every two adjacent vertical partitions (5), the lower end surface of the bottom plate (7) is connected to a plurality of oil nozzles (11), each of the oil nozzles (11) is connected to the corresponding oil passage (14), and an explosion-proof oil pipe (13) is interference-inserted on the outer side of each oil nozzle (11).

2. A fuel distribution unevenness detection device according to claim 1, characterized in that: The flow divider (4) comprises an outer ring body (401) and a plurality of flow divider blocks (402) evenly distributed radially from the center to the outer ring body, each of the flow divider blocks (402) is an isosceles triangular pyramid, an oil passage (14) is formed between every two adjacent flow divider blocks (402), and the lower end of each flow divider block (402) is respectively plugged and fixed to the upper end of the corresponding vertical partition (5).

3. A fuel distribution unevenness detection device according to claim 2, characterized in that: The upper surface of the bottom plate (7) is provided with a plurality of wedge blocks (701), and the plurality of wedge blocks (701) are arranged in one-to-one correspondence with the plurality of oil passages (14). A vertical partition (5) is interspaced and inserted between each two adjacent wedge blocks (701), and the outer wall of each wedge block (701) is interspaced with the inner wall of the lower enclosure plate (6); an oil passage hole (702) is provided on the outer side of each wedge block (701), and each of the oil passage holes (702) is respectively screwed with a corresponding oil nozzle (11); each wedge block (701) has a guide surface with an inclination angle of 5°-15°, and the height of the guide surface gradually decreases from the inside to the outside along the radial direction of the bottom plate (7).

4. A fuel distribution unevenness detection device according to claim 2 or 3, characterized in that: The upper surface of the cover plate (1) is evenly provided with a plurality of pressure sensors along its circumference. When the clamp is positioned, the uniformity of the position force at each point is detected by the pressure sensors.

5. A fuel distribution unevenness detection device according to claim 4, characterized in that: Both side walls of each vertical partition (5) are provided with vertically arranged guide grooves, and the depth of each guide groove increases from top to bottom.

6. A fuel distribution unevenness detection device according to claim 5, characterized in that: A detachable flow guide cap is provided on the top of the cone tip (8), and guide grooves extending radially along the flow guide cap are distributed on the surface of the flow guide cap.

7. A fuel distribution unevenness detection device according to claim 1, characterized in that: The oil outlet end of each explosion-proof oil pipe (13) is integrated with an ultrasonic flow meter.

8. A method for using the fuel distribution unevenness detection device according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S1: The part to be tested is mounted at the positioning diameter of the cover plate (1) by means of a positioning fixture, and the coaxiality between the oil injection hole of the part nozzle and the axis of the cone tip (8) is ensured to be ≤0.05 mm. The force uniformity of each point is detected in real time by means of a pressure sensor, and an alarm is triggered when the force value deviation at any point exceeds a set threshold value; S2: The fuel supply system is started, and the fuel forms a columnar jet through the nozzle spray hole and impacts the guide cap, and is evenly dispersed for the first time through the guide groove on its surface. The dispersed fuel is secondary diverted along the isosceles triangular pyramid guide surface of the diverter block (402); S3: The fuel oil after double diversion enters the oil passage (14) formed by the vertical partition (5), and the guide groove of the vertical partition (5) guides the fuel oil to form a laminar flow state, thereby reducing the influence of turbulence on the measurement accuracy; S4: The fuel in each oil passage (14) enters the ultrasonic flow meter measurement section through the explosion-proof oil pipe (13), the measurement points of the ultrasonic flow meter ring array synchronously collect flow velocity data, a three-dimensional flow velocity field model is constructed using a time difference algorithm, and a flow velocity distribution cloud diagram of each cross section is displayed through a device observer; S5: After the detection data is processed by the analysis terminal, a non-uniformity evaluation report is automatically generated.

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