Oil nozzle performance detection tool and detection method

Abstract

The oil nozzle comprises an oil nozzle body, a guide middle hole is formed in the upper end of the oil nozzle body, a needle valve is arranged in the guide middle hole, a guide outer circle is arranged on the outer side of the needle valve, the outer diameter of the guide outer circle is larger than that of the needle valve, and the guide outer circle slides in the guide middle hole. An oil containing groove is formed in the lower end of the guiding outer circle in the guiding middle hole. The lower end of the needle valve abuts against the bottom of the guiding middle hole. The performance detection tool comprises an oil tank, a hydraulic distribution head, a first pressure oil path, a first oil return path, a second pressure oil path, a first pressure oil branch and a second pressure oil branch. The oil nozzle is clamped at one time through the performance detection tool, the diameter part sealing performance of the oil nozzle guide middle hole matched with the needle valve guide outer circle, the oil nozzle seat surface sealing performance and the comprehensive performance can be detected through fluctuation of pressure oil, the detection efficiency is high, the measurement is accurate, and the equipment cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of fuel nozzle detection equipment, and in particular to a fuel nozzle performance detection tool and a detection method. Background Art

[0002] The sealing performance of the guide hole and the outer circle of the guide of the nozzle and the sealing performance of the seat surface are important performance indicators of the nozzle. Usually, the sealing performance of the guide hole and the outer circle of the guide of the nozzle is detected by the input gas flow rate. It is difficult to accurately judge the sealing performance of the guide outer circle of the nozzle under the condition of high-pressure common rail use. The sealing performance of the seat surface is detected by visual inspection under pressure. It is also difficult to accurately judge the sealing performance of the nozzle seat surface under the condition of high-pressure common rail use.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In view of the deficiencies in the prior art, the embodiments of the present invention disclose a nozzle performance testing tool and a testing method to solve the problems of low accuracy and low efficiency in testing the sealing performance of the guide outer circle of the guide hole and the seat surface of the nozzle.

[0005] The technical solution adopted by the present invention is as follows:

[0006] The performance testing tool of the oil nozzle is used for testing the sealing performance of the oil nozzle. The oil nozzle includes an oil nozzle body, a guide hole is provided at the upper end of the oil nozzle body, a needle valve is arranged in the guide hole, a guide outer circle is provided on the outer side of the needle valve, the outer diameter of the guide outer circle is larger than the outer diameter of the needle valve, the guide outer circle slides in the guide hole, an oil storage groove is provided in the guide hole at the lower end of the guide outer circle, and the lower end of the needle valve abuts against the bottom of the guide hole; the performance testing tool includes: an oil tank; a hydraulic distribution head, which is arranged at the upper end of the oil nozzle body, and the hydraulic distribution head includes: a pressing chamber, which is provided at the The lower end of the hydraulic distribution head and the second end are connected to the guide center hole; the first pressure collection side hole and the first end are connected to the clamping chamber; the first pressure sensor is connected to the second end of the first pressure collection side hole; the first pressure oil circuit, the first end is connected to the oil tank, and the second end is connected to the first end of the clamping chamber, and the first pressure oil circuit is sequentially provided with a high-pressure pump, a second switch valve and a first switch valve from front to back; the first return oil circuit, the first end is connected to the first pressure oil circuit and is located between the first switch valve and the second switch valve, and the second end is connected to the oil tank, and the third switch valve is provided on the first return oil circuit.

[0007] Its further technical solution is that the lower end of the guide outer circle has a pressure-bearing surface, the pressure-bearing surface is located in the oil storage tank, and an oil inlet hole is provided on the side of the oil nozzle body, and the second end of the oil inlet hole is connected to the oil storage tank; the hydraulic distribution head includes: an oil inlet channel, which runs through the hydraulic distribution head and is connected to the first end of the oil inlet hole at the second end; a second pressure collection side hole, which is provided on the side of the hydraulic distribution head and is connected to the oil inlet channel at the first end; a second pressure sensor, which is connected to the second end of the second pressure collection side hole; the performance detection tooling includes: a second pressure oil circuit, the first end of which is connected to the oil tank, and the second pressure oil circuit includes: an oil pump, which is arranged on the second pressure oil circuit; a first pressure oil branch, the first end of which is connected to the second end of the second pressure oil circuit, and the second end is connected to the first end of the oil inlet channel; a second pressure oil branch, the first end of which is connected to the second end of the second pressure oil circuit, and the second end is connected to the first end of the clamping chamber, and a fourth switch valve is arranged on the second pressure oil branch.

[0008] A further technical solution is that the second pressure oil circuit includes: a high-pressure plunger pump, which is arranged on the second pressure oil circuit and located at the rear end of the oil delivery pump.

[0009] A further technical solution is that the first pressure oil circuit includes: an accumulator, which is arranged on the first pressure oil circuit and located between the high-pressure pump and the second switch valve.

[0010] A further technical solution is that the performance testing tool comprises: a second oil return circuit, a first end of which is connected to the first pressure oil branch circuit, and a second end of which is connected to the oil tank; and a safety valve, which is arranged on the second oil return circuit.

[0011] Its further technical solution is that the needle valve includes: a tail, a guide outer circle and a small outer circle connected in sequence from the upper end to the lower end, the lower end of the small outer circle has a sealing cone surface; the lower end of the guide center hole has a seat surface matching the sealing cone surface; wherein the tail, the guide outer circle, the small outer circle and the sealing cone surface are coaxially arranged, the outer diameter of the guide outer circle is larger than the outer diameters of the tail and the small outer circle, the outer diameter of the guide outer circle is larger than the inner diameter of the clamping cavity, and the tail slides in the clamping cavity.

[0012] A further technical solution is that a spray hole is arranged in an annular shape at the lower end of the oil nozzle, the spray hole is located at the lower end of the seat surface, and the spray hole sprays pressurized oil toward the oil tank.

[0013] The method for testing the sealing performance of the oil nozzle using the above-mentioned oil nozzle performance testing tool comprises the following steps:

[0014] Detect the sealing performance of the diameter of the nozzle guide center hole and the needle valve guide outer circle: open the first switch valve and the second switch valve, close the third switch valve and the fourth switch valve, start the high-pressure pump to input pressure oil at a constant pressure into the first pressure oil circuit, the clamping chamber, the second pressure oil branch and the first pressure collection side hole, and the first pressure sensor detects the first pressure drop detection value within the set time; compare the first pressure drop detection value with the first pressure drop setting value to determine whether the sealing performance of the diameter of the nozzle guide center hole and the guide outer circle is qualified;

[0015] Check the sealing of the nozzle seat: close the first switch valve, the second switch valve and the fourth switch valve, open the third switch valve, and return oil to the first oil return circuit; start the oil pump 44 and the high-pressure plunger pump to input pressure oil into the second pressure oil circuit, the first pressure oil branch, the oil inlet channel, the oil inlet hole and the second pressure collection side hole. At this time, the oil pressure in the clamping cavity is balanced with the oil pressure in the guide center hole, and the second pressure sensor detects the second pressure drop detection value within the set time; compare the second pressure drop detection value with the second pressure drop setting value to determine whether the sealing of the nozzle seat is qualified.

[0016] Its further technical solution is that after the step of detecting the sealing performance of the nozzle seat surface, it also includes: detecting the opening pressure and the number of vibrations of the nozzle: starting the oil delivery pump and the high-pressure plunger pump to quantitatively input continuously pressurized pressure oil into the second pressure oil circuit, the first pressure oil branch, the oil inlet channel, the oil inlet hole and the second pressure collection side hole. At this time, the oil pressure in the guide center hole continues to increase and exceeds the oil pressure in the clamping cavity. When the oil pressure in the guide center hole reaches a certain value, the needle valve lifts upward, and the nozzle opens to spray oil. The second pressure sensor detects the instantaneous pressure value of the nozzle opening and the number of vibrations of the needle valve; the opening pressure detection value is compared with the opening pressure setting value, and the vibration number detection value is compared with the vibration number setting value to determine whether the nozzle performance is qualified.

[0017] The beneficial effects of the embodiments of the present invention are as follows:

[0018] (I) The nozzle performance detection tool of the present invention includes an oil tank, a hydraulic distribution head, a first pressure oil circuit and a first return oil circuit. Pressure oil is input into the first pressure oil circuit, the clamping chamber, the second pressure oil branch and the first pressure collection side hole at a constant pressure through a high-pressure pump. The pressure oil can leak into the oil storage tank through the gap between the outer guide circle of the needle valve and the inner wall of the guide middle hole. The sealing performance of the diameter of the nozzle guide middle hole and the needle valve guide outer circle can be determined by measuring the pressure drop value within a certain period of time. The installation is convenient, and the detection efficiency and accuracy are high.

[0019] (ii) Furthermore, the hydraulic distribution head includes an oil inlet channel, a second pressure collection side hole and a second pressure sensor. The performance detection tooling includes a second pressure oil circuit, a first pressure oil branch and a second pressure oil branch. By closing the first switch valve and the fourth switch valve, the pressure in the clamping chamber is maintained, and the oil pump and the high-pressure plunger pump are started to input pressure oil into the second pressure oil circuit, the first pressure oil branch, the oil inlet channel, the oil inlet hole and the second pressure collection side hole. At this time, the oil pressure in the clamping chamber is balanced with the oil pressure in the guide center hole, and no oil flow will occur at the upper and lower ends of the guide outer circle. There is only leakage at the seat surface seal. The sealing performance of the nozzle seat surface can be judged by detecting the pressure drop value in the second pressure collection side hole through the second pressure sensor. If the oil pressure in the guide center hole is greater than a certain value of the oil pressure in the clamping chamber, the opening oil pressure and the number of vibrations of the nozzle can be detected. The installation is convenient, and the detection efficiency and accuracy are high.

[0020] (III) Furthermore, by clamping the nozzle once with a performance testing tool, the sealing performance of the diameter of the nozzle guide center hole and the needle valve guide outer circle, the sealing performance of the nozzle seat surface and the comprehensive performance can be tested through the fluctuation of the pressure oil. The testing efficiency is high, the measurement is accurate and the equipment cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the state of the oil nozzle guide outer circle sealing performance detected by the oil nozzle performance detection tool of the present invention.

[0022] Figure 2 It is a schematic diagram of the state of the oil nozzle seat surface sealing performance detected by the oil nozzle performance detection tool of the present invention.

[0023] Figure 3 It is a schematic diagram of the comprehensive performance status of a fuel nozzle detected by the fuel nozzle performance detection tool of the present invention.

[0024] In the figure:

[0025] 1. Nozzle body; 11. Guide center hole; 12. Oil storage tank; 13. Oil inlet hole; 14. Spray hole; 2. First pressure oil circuit; 21. High-pressure pump; 22. First switch valve; 23. Second switch valve; 24. Accumulator; 3. First return oil circuit; 31. Third switch valve; 4. Second pressure oil circuit; 41. First pressure oil branch; 42. Second pressure oil branch; 43. Fourth switch valve; 44. Oil delivery pump; 45. High-pressure plunger pump; 5. Second return oil circuit; 51. Safety valve; 6. Hydraulic distribution head; 61. Compressing chamber; 62. First pressure collection side hole; 63. First pressure sensor; 64. Oil inlet channel; 65. Second pressure collection side hole; 66. Second pressure sensor; 7. Oil tank; 8. Needle valve; 81. Tail; 82. Guide outer circle; 821. Pressure-bearing surface; 83. Small outer circle; 84. Sealing cone surface. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0027] In order to make the purpose, technical scheme and advantages of the present invention clearer, the device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0028] First embodiment:

[0029] This embodiment discloses a nozzle performance testing tool.

[0030] The nozzle performance detection tool is used for the nozzle, which includes a nozzle body 1. A guide center hole 11 is provided at the upper end of the nozzle body 1. A needle valve 8 is arranged in the guide center hole 11. A guide outer circle 82 is provided on the outer side of the needle valve 8. The outer diameter of the guide outer circle 82 is larger than the outer diameter of the needle valve 8. The guide outer circle 82 slides in the guide center hole 11. An oil storage groove 12 is provided in the guide center hole 11 at the lower end of the guide outer circle 82. The lower end of the needle valve 8 abuts against the bottom of the guide center hole 11.

[0031] The performance detection tooling includes an oil tank 7 , a hydraulic distribution head 6 , a first pressure oil circuit 2 and a first return oil circuit 3 .

[0032] The hydraulic distribution head 6 is arranged at the upper end of the nozzle body 1. The hydraulic distribution head 6 includes a clamping chamber 61, a first pressure collection side hole 62 and a first pressure sensor 63. The clamping chamber 61 is opened at the lower end of the hydraulic distribution head 6, and the second end is connected to the guide center hole 11. The first end of the first pressure collection side hole 62 is connected to the clamping chamber 61, and the first pressure sensor 63 is connected to the second end of the first pressure collection side hole 62. The first end of the first pressure oil circuit 2 is connected to the oil tank 7, and the second end of the first pressure oil circuit 2 is connected to the first end of the guide center hole 11. The high-pressure pump 21, the second switch valve 23 and the first switch valve 22 are arranged on the first pressure oil circuit 2 from front to back. The first end of the first return oil circuit 3 is connected to the first pressure oil circuit 2, and is located between the first switch valve 22 and the second switch valve 23, and the second end is connected to the oil tank 7. The third switch valve 31 is arranged on the first return oil circuit 3.

[0033] Furthermore, the first pressure oil circuit 2 includes an accumulator 24 , which is disposed on the first pressure oil circuit 2 and located between the high-pressure pump 21 and the second switch valve 23 , and plays a role in accumulating and stabilizing pressure.

[0034] In this embodiment, pressure oil is input into the first pressure oil circuit 2, the clamping chamber 61, the second pressure oil branch 42 and the first pressure collection side hole 62 at a constant pressure through the high-pressure pump 21. The pressure oil can leak into the oil holding tank 12 through the gap between the outer guide outer circle 82 of the needle valve 8 and the inner wall of the guide middle hole 11. The sealing performance of the diameter of the matching between the oil nozzle guide middle hole 11 and the guide outer circle 82 of the needle valve 8 can be determined by measuring the pressure drop value within a certain period of time. The installation is convenient and the detection efficiency and accuracy are high.

[0035] Second embodiment:

[0036] Based on the first embodiment, the second embodiment is further optimized and refined.

[0037] The lower end of the guide outer circle 82 has a pressure-bearing surface 821 , which is located in the oil storage tank 12 . An oil inlet hole 13 is formed on the side of the nozzle body 1 , and a second end of the oil inlet hole 13 is connected to the oil storage tank 12 .

[0038] Exemplarily, the needle valve 8 includes a tail 81, a guide outer circle 82 and a small outer circle 83 connected in sequence from the upper end to the lower end, and the lower end of the small outer circle 83 has a sealing cone 84. The lower end of the guide center hole 11 has a seat surface that matches the sealing cone 84. Among them, the tail 81, the guide outer circle 82, the small outer circle 83 and the sealing cone 84 are coaxially arranged, the outer diameter of the guide outer circle 82 is larger than the outer diameters of the tail 81 and the small outer circle 83, and the guide outer circle 82 and the small outer circle 83 are transitioned by a pressure-bearing surface 821. The pressure-bearing surface 821 allows the needle valve 8 to withstand the upward oil pressure, the outer diameter of the guide outer circle 82 is larger than the inner diameter of the clamping cavity 61, and the tail 81 slides in the clamping cavity 61.

[0039] The hydraulic distribution head 6 includes an oil inlet passage 64, a second pressure collection side hole 65, and a second pressure sensor 66. The oil inlet passage 64 is opened through the hydraulic distribution head 6, and the second end is connected to the first end of the oil inlet hole 13. The second pressure collection side hole 65 is opened on the side of the hydraulic distribution head 6, and the first end is connected to the oil inlet passage 64. The second pressure sensor 66 is connected to the second end of the second pressure collection side hole 65.

[0040] The performance testing tooling includes a second pressure oil circuit 4, a first pressure oil branch 41, and a second pressure oil branch 42. The first end of the second pressure oil circuit 4 is connected to the oil tank 7, and the second pressure oil circuit 4 includes an oil pump 44, which is arranged on the second pressure oil circuit 4. The first end of the first pressure oil branch 41 is connected to the second end of the second pressure oil circuit 4, and the second end of the first pressure oil branch 41 is connected to the first end of the oil inlet channel 64. The first end of the second pressure oil branch 42 is connected to the second end of the second pressure oil circuit 4, and the second end of the second pressure oil branch 42 is connected to the first end of the pressing chamber 61, and the fourth switch valve 43 is arranged on the second pressure oil branch 42.

[0041] Furthermore, the second pressure oil circuit 4 includes a high-pressure plunger pump 45 , which is disposed on the second pressure oil circuit 4 and located at the rear end of the oil delivery pump 44 , and provides a test oil pressure exceeding 150 bar.

[0042] Furthermore, the performance testing tooling includes a second oil return circuit 5 and a safety valve 51. The first end of the second oil return circuit 5 is connected to the first pressure oil branch circuit 41, the second end of the second oil return circuit 5 is connected to the oil tank 7, and the safety valve 51 is arranged on the second oil return circuit 5. When the oil pressure exceeds the safety value, the safety valve 51 opens, and part of the pressure oil returns to the oil tank 7 through the second oil return circuit 5, so that the oil pressure returns to the safety value, thereby improving the safety of the testing tooling.

[0043] Furthermore, a spray hole 14 is provided in a ring shape at the lower end of the oil nozzle. The spray hole 14 is located at the lower end of the seat surface. The spray hole 14 sprays pressurized oil toward the oil tank 7, so that the pressurized oil sprayed from the spray hole 14 can fall into the oil tank 7, thereby saving costs.

[0044] In this embodiment, by closing the first switch valve 22 and the fourth switch valve 43, the pressure in the clamping chamber 61 is maintained, and the oil delivery pump 44 and the high-pressure plunger pump 45 are started to input pressure oil into the second pressure oil circuit 4, the first pressure oil branch 41, the oil inlet channel 64, the oil inlet hole 13 and the second pressure collection side hole 65. At this time, the oil pressure in the clamping chamber 61 is balanced with the oil pressure in the guide middle hole 11, and no oil flow will occur at the upper and lower ends of the guide outer circle 82. There is only leakage at the seat surface seal. The sealing performance of the nozzle seat surface can be judged by detecting the pressure drop value in the second pressure collection side hole 65 through the second pressure sensor 66. If the oil pressure in the guide middle hole 11 is greater than a certain value of the oil pressure in the clamping chamber 61, the opening oil pressure and the number of vibrations of the nozzle can be detected, which is convenient to install and has high detection efficiency and high accuracy.

[0045] Third embodiment:

[0046] This embodiment discloses a method for testing the sealing performance of a fuel nozzle using the fuel nozzle performance testing tool of the second embodiment, comprising the following steps:

[0047] Step S1, detecting the sealing performance of the diameter of the nozzle guide center hole 11 and the needle valve 8 guide outer circle 82:

[0048] Step S11, open the first switch valve 22 and the second switch valve 23, close the third switch valve 31 and the fourth switch valve 43, start the high-pressure pump 21 to input pressure oil into the first pressure oil circuit 2, the clamping chamber 61, the second pressure oil branch 42 and the first pressure collection side hole 62 at a constant pressure, and the first pressure sensor 63 detects the first pressure drop detection value within the set time.

[0049] Specifically, the oil pressure delivered by the high pressure pump 21 is 150 bar. The pressure oil leaks into the oil tank 12 through the radial gap between the guide outer circle 82 of the needle valve 8 and the guide middle hole 11, and the first pressure sensor 63 detects the pressure drop value within 500 ms.

[0050] Step S12, comparing the first pressure drop detection value with the first pressure drop setting value to determine whether the sealing performance of the diameter of the matching between the nozzle guide center hole 11 and the needle valve guide outer circle 82 is qualified.

[0051] Specifically, the voltage drop ratio within 500ms is usually required to be ≤4%.

[0052] Step S2, testing the sealing performance of the nozzle seat surface:

[0053] Step S21, close the first switch valve 22, the second switch valve 23 and the fourth switch valve 43, open the third switch valve 31, and return oil from the first oil return line 3. Start the oil delivery pump 44 and the high-pressure plunger pump 45 to input pressure oil into the second pressure oil circuit 4, the first pressure oil branch 41, the oil inlet channel 64, the oil inlet hole 13 and the second pressure collection side hole 65. At this time, the oil pressure in the clamping chamber 61 is balanced with the oil pressure in the guide middle hole 11, and the second pressure sensor 66 detects the second pressure drop detection value within the set time.

[0054] Specifically, the oil pressure delivered by the high-pressure plunger pump 45 is 145-150 bar, and the oil pressure detected by the first pressure sensor 63 is 150 bar. Since the oil pressure at the upper and lower ends of the guide outer circle 82 of the needle valve 8 is balanced, no oil flow will occur, and there is only leakage at the seat surface seal. By measuring the change of the oil pressure in the second pressure collection side hole 65, the sealing performance of the nozzle seat surface can be judged.

[0055] Step S22, comparing the second pressure drop detection value with the second pressure drop setting value to determine whether the sealing performance of the nozzle seat surface is qualified.

[0056] Specifically, the voltage drop ratio within 500ms is usually required to be ≤2%.

[0057] Step S3, detecting the nozzle opening pressure and vibration times:

[0058] Step S31, start the oil delivery pump 44 and the high-pressure plunger pump 45 to quantitatively input continuously pressurized pressure oil into the second pressure oil circuit 4, the first pressure oil branch 41, the oil inlet channel 64, the oil inlet hole 13 and the second pressure collection side hole 65. At this time, the oil pressure in the guide center hole 11 continues to increase and exceeds the oil pressure in the clamping chamber 61. When the oil pressure in the guide center hole 11 reaches a certain value, the needle valve 8 is lifted upward. At this time, the oil nozzle opens to spray oil, and the second pressure sensor 66 detects the instantaneous pressure value when the oil nozzle opens and the number of times the needle valve 8 vibrates.

[0059] Specifically, the oil pressure will drop when the needle valve 8 opens, and the pressure value at that moment is the nozzle opening pressure. After the nozzle is opened, the oil pressure first drops to the closing pressure, and then rises to the opening pressure, forming a vibration.

[0060] Step S32, comparing the opening pressure detection value with the opening pressure setting value, and comparing the vibration number detection value with the vibration number setting value, to determine whether the nozzle performance is qualified.

[0061] Specifically, the opening pressure is 180 bar ± 1.5 bar, and the vibration number is required to be ≥ 15 times.

[0062] Among them, step S3 is a test after the oil supply is stopped in step S2. At this time, the high-pressure plunger pump 45 stops pressurizing to maintain the pressure, and the oil nozzle also remains in a sealed state.

[0063] In this embodiment, the oil nozzle is clamped once by the performance testing tool, and the diameter sealing performance of the matching between the oil nozzle guide center hole 11 and the guide outer circle 82 of the needle valve 8, the oil nozzle seat surface sealing performance and comprehensive performance can be tested through the fluctuation of the pressure oil. The testing efficiency is high, the measurement is accurate, and the equipment cost is low.

[0064] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. The nozzle performance testing tool is characterized by: Used for an oil nozzle, the oil nozzle comprises an oil nozzle body (1), a guide middle hole (11) is provided at the upper end of the oil nozzle body (1), a needle valve (8) is arranged in the guide middle hole (11), a guide outer circle (82) is provided on the outer side of the needle valve (8), the outer diameter of the guide outer circle (82) is larger than the outer diameter of the needle valve (8), the guide outer circle (82) slides in the guide middle hole (11), an oil storage groove (12) is provided in the guide middle hole (11) at the lower end of the guide outer circle (82), and the lower end of the needle valve (8) abuts against the bottom of the guide middle hole (11); The performance testing tooling comprises: Fuel tank (7); A hydraulic distribution head (6) is arranged at the upper end of the nozzle body (1), and the hydraulic distribution head (6) comprises: a pressing chamber (61) opened at the lower end of the hydraulic distribution head (6), and the second end of the pressing chamber is connected to the guide center hole (11); A first pressure collection side hole (62), a first end of which is connected to the compression chamber (61); A first pressure sensor (63) connected to the second end of the first pressure collection side hole (62); A first pressure oil circuit (2), a first end of which is connected to the oil tank (7), and a second end of which is connected to the first end of the pressing chamber (61), wherein a high-pressure pump (21), a second switch valve (23) and a first switch valve (22) are sequentially arranged on the first pressure oil circuit (2) from front to back; A first oil return circuit (3) has a first end connected to the first pressure oil circuit (2) and located between the first switch valve (22) and the second switch valve (23), and a second end connected to the oil tank (7). A third switch valve (31) is provided on the first oil return circuit (3).

2. The nozzle performance testing tool according to claim 1 is characterized in that: The lower end of the guide outer circle (82) has a pressure-bearing surface (821), and the pressure-bearing surface (821) is located in the oil storage tank (12). The side of the oil nozzle body (1) is provided with an oil inlet hole (13), and the second end of the oil inlet hole (13) is connected to the oil storage tank (12); The hydraulic distribution head (6) comprises: An oil inlet passage (64) is formed through the hydraulic distribution head (6), and a second end thereof is connected to a first end of the oil inlet hole (13); A second pressure collection side hole (65) is provided on the side of the hydraulic distribution head (6), and a first end thereof is connected to the oil inlet passage (64); A second pressure sensor (66) connected to the second end of the second pressure collection side hole (65); The performance testing tooling comprises: A second pressure oil circuit (4), a first end of which is connected to the oil tank (7), and the second pressure oil circuit (4) comprises: An oil delivery pump (44) is arranged on the second pressure oil circuit (4); A first pressure oil branch (41), a first end of which is connected to a second end of the second pressure oil circuit (4), and a second end of which is connected to a first end of the oil inlet passage (64); The second pressure oil branch (42) has a first end connected to the second end of the second pressure oil circuit (4), and a second end connected to the first end of the pressing chamber (61). A fourth switch valve (43) is provided on the second pressure oil branch (42).

3. The nozzle performance testing tool according to claim 2 is characterized in that: The second pressure oil circuit (4) comprises: A high-pressure plunger pump (45) is arranged on the second pressure oil circuit (4) and is located at the rear end of the oil delivery pump (44).

4. The nozzle performance testing tool according to claim 2 is characterized in that: The first pressure oil circuit (2) comprises: The accumulator (24) is arranged on the first pressure oil circuit (2) and is located between the high-pressure pump (21) and the second switch valve (23).

5. The nozzle performance testing tool according to claim 2 is characterized in that: The performance testing tooling comprises: A second oil return circuit (5), a first end of which is connected to the first pressure oil branch circuit (41), and a second end of which is connected to the oil tank (7); A safety valve (51) is provided on the second oil return line (5).

6. The nozzle performance testing tool according to claim 2, characterized in that: The needle valve (8) comprises: A tail portion (81), a guide outer circle (82) and a small outer circle (83) are sequentially connected from the upper end to the lower end, wherein the lower end of the small outer circle (83) has a sealing cone surface (84); and the lower end of the guide center hole (11) has a seat surface matched with the sealing cone surface (84); The tail portion (81), the guide outer circle (82), the small outer circle (83) and the sealing cone surface (84) are coaxially arranged, the outer diameter of the guide outer circle (82) is larger than the outer diameters of the tail portion (81) and the small outer circle (83), the outer diameter of the guide outer circle (82) is larger than the inner diameter of the clamping cavity (61), and the tail portion (81) slides in the clamping cavity (61).

7. The nozzle performance testing tool according to claim 6, characterized in that: A spray hole (14) is provided in an annular shape at the lower end of the oil nozzle. The spray hole (14) is located at the lower end of the seat surface. The spray hole (14) sprays pressurized oil toward the oil tank (7).

8. A method for testing the sealing performance of a fuel nozzle using the fuel nozzle performance testing tool as claimed in claim 3, characterized in that: The following steps are involved: Detecting the sealing performance of the diameter of the nozzle guide center hole (11) and the needle valve (8) guide outer circle (82): opening the first switch valve (22) and the second switch valve (23), closing the third switch valve (31) and the fourth switch valve (43), starting the high-pressure pump (21) to input pressure oil at a constant pressure into the first pressure oil circuit (2), the clamping chamber (61), the second pressure oil branch circuit (42) and the first pressure collection side hole (62), and the first pressure sensor (63) detects a first pressure drop detection value within a set time; comparing the first pressure drop detection value with the first pressure drop setting value to determine whether the sealing performance of the diameter of the nozzle guide center hole (11) and the guide outer circle (82) is qualified; Detecting the sealing performance of the nozzle seat surface: closing the first switch valve (22), the second switch valve (23) and the fourth switch valve (43), opening the third switch valve (31), and returning the oil from the first oil return path (3); starting the oil delivery pump 44 and the high-pressure plunger pump (45) to input pressure oil into the second pressure oil path (4), the first pressure oil branch path (41), the oil inlet passage (64), the oil inlet hole (13) and the second pressure collection side hole (65); at this time, the oil pressure in the clamping chamber (61) is balanced with the oil pressure in the guide center hole (11), and the second pressure sensor (66) detects the second pressure drop detection value within a set time; comparing the second pressure drop detection value with the second pressure drop setting value to determine whether the sealing performance of the nozzle seat surface is qualified.

9. The method for detecting the sealing performance of a fuel nozzle according to claim 8, characterized in that: After the step of detecting the sealing performance of the nozzle seat surface, the method further comprises: Detecting the opening pressure and vibration number of the oil nozzle: starting the oil delivery pump (44) and the high-pressure plunger pump (45) to quantitatively input continuously pressurized pressure oil into the second pressure oil circuit (4), the first pressure oil branch circuit (41), the oil inlet channel (64), the oil inlet hole (13) and the second pressure collection side hole (65), at which time the oil pressure in the guide center hole (11) continues to increase and exceeds the oil pressure in the clamping chamber (61), when the oil pressure in the guide center hole (11) reaches a certain value, the needle valve (8) is lifted upward, and the oil nozzle is opened to spray oil, and the second pressure sensor (66) detects the instantaneous pressure value of the oil nozzle opening and the vibration number of the needle valve (8); comparing the opening pressure detection value with the opening pressure setting value, and comparing the vibration number detection value with the vibration number setting value, to determine whether the oil nozzle performance is qualified.

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