A diesel engine oil supply assembly seal test device and method

Abstract

The present application relates to a kind of diesel engine oil supply assembly leak test device and test method.Diesel engine oil supply assembly leak test device includes: fixed plate, for horizontal direction fixed diesel engine oil supply assembly, fixed plate is provided with through hole, for accommodating and fixed the convex part of plunger sleeve, fixed plate upper surface is fixed plate positioning plane, with plunger sleeve fit installation, fixed plate is downwardly provided with fixed plate U type groove, avoid with plunger sleeve outer circle form interference;Fixed plate is opened fixed plate oil channel, with the other end position corresponding of first plunger sleeve oil channel;Support plate, for vertical direction fixed plunger and the relative position of plunger sleeve, support plate is opened T type groove, for plunger bottom surface installation, T type groove is provided with support plate positioning plane, for plunger end face support and limit.According to the present application, a kind of diesel engine oil supply assembly leak test device, easy to assemble and use, manufacturing difficulty is low, can satisfy different product testing to reach technical requirement, ensure product quality improvement.

Description

Technical Field

[0001] This invention relates to the field of fixture equipment technology, and more specifically, to a diesel engine fuel supply component sealing test device and test method. Background Technology

[0002] The high-pressure fuel pump is a key component of a diesel engine. Its function is to convert low-pressure fuel into high-pressure fuel according to the engine's needs in a timed and metered manner, deliver it through high-pressure fuel lines and common rails, and finally inject it into the combustion chamber through injectors. To meet the requirements of different operating conditions of the diesel engine, the fuel supply flow rate and pressure of the high-pressure fuel pump are adjusted according to the characteristic parameters of the diesel engine under different operating conditions, so as to meet the fuel supply flow rate and combustion requirements of the diesel engine at different operating points.

[0003] The fuel supply assembly of the high-pressure fuel pump for diesel engines adopts an integrated mechanism of plunger assembly, inlet valve assembly, and outlet valve assembly. The sealing performance of the fuel supply assembly has two effects on the high-pressure fuel pump: First, if the sealing cone surface of the inlet valve of the fuel supply assembly has poor sealing performance, it is easy to cause high-pressure leakage under high pressure, resulting in insufficient fuel supply flow of the high-pressure fuel pump. Insufficient flow will cause insufficient fuel supply pressure in the fuel supply pump system, affecting the atomization of the injector and ultimately affecting the combustion characteristics of the diesel engine. Second, if the sealing ring between the plunger and the plunger sleeve of the fuel supply assembly has poor sealing performance, it is easy to cause the diesel engine to produce diesel fuel mixture.

[0004] In summary, the sealing test of the diesel engine fuel supply assembly is particularly important for the fuel supply characteristics of the high-pressure fuel pump. To avoid product quality problems and meet the reliability requirements of diesel engines, it is necessary to test the sealing performance of the fuel supply assembly 100%. Therefore, there is an urgent need for a diesel engine fuel supply assembly sealing performance testing scheme to achieve the sealing performance test of the diesel engine fuel supply assembly. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to perform a sealing test on the fuel supply components of a diesel engine.

[0006] To solve the above-mentioned technical problems, according to one aspect of the present invention, a diesel engine fuel supply assembly sealing performance testing device is provided for testing the sealing performance of a diesel engine fuel supply assembly. The diesel engine fuel supply assembly includes: a plunger sleeve with a vertically downward opening; an inlet valve, an inlet valve oil passage, a plunger cavity, and a plunger arranged sequentially from top to bottom; a sealing ring fitted around the circumference of the plunger near the opening end of the plunger sleeve for sealing between the plunger and the plunger sleeve; the opening end of the plunger sleeve protrudes beyond the entire plunger sleeve, forming a protrusion; the plunger sleeve also includes a first plunger sleeve oil passage at an angle to the plunger axis, one end of which communicates with the inlet valve oil passage; the plunger sleeve further includes a horizontally oriented second plunger sleeve oil passage and an outlet valve connector communicating with the second plunger sleeve oil passage; the outlet valve connector has an axially oriented outlet valve connector oil passage. The system includes a second plunger sleeve oil passage connected to the side wall of the vertically downward opening of the plunger sleeve. When the plunger slides downward and the plunger cavity connects with the second plunger sleeve oil passage, oil is dispensed. The diesel engine fuel supply assembly sealing test device includes: a fixing plate for horizontally fixing the diesel engine fuel supply assembly; a through hole for accommodating and fixing the protrusion of the plunger sleeve; an upper surface of the fixing plate as a fixing plate positioning plane for fitting snugly against the plunger sleeve; a U-shaped groove on the fixing plate to avoid interference with the outer circle of the plunger sleeve; a fixing plate oil passage on the fixing plate corresponding to the other end of the first plunger sleeve oil passage; and a support plate for vertically fixing the relative position of the plunger and plunger sleeve; a T-slot for mounting the bottom surface of the plunger; and a positioning plane on the T-slot for supporting and limiting the plunger end face.

[0007] According to an embodiment of the present invention, the diesel engine fuel supply component sealing test device may further include: an oil inlet connector, coaxially mounted on the oil passage of the fixed plate, and an oil inlet connector oil passage coaxially arranged inside the oil inlet connector.

[0008] According to an embodiment of the present invention, a crescent groove may be provided on the support plate near the oil inlet connector to avoid interference with the oil inlet connector.

[0009] According to an embodiment of the present invention, the diesel engine fuel supply assembly sealing test device may further include bolts and nuts for connecting and fixing the fixing plate and the support plate.

[0010] According to an embodiment of the present invention, the diesel engine fuel supply assembly sealing test device may further include: an O-ring disposed on the inner wall of the fixed plate oil passage for sealing the connection between the fixed plate oil passage and the first plunger sleeve oil passage.

[0011] According to an embodiment of the present invention, the diesel engine fuel supply component sealing test device may further include: a first oil outlet plug and a second oil outlet plug, for threaded connection with the high-pressure oil outlet connector of the diesel engine fuel supply component, to ensure that the two high-pressure oil outlet connectors are leak-free.

[0012] According to an embodiment of the present invention, the first oil outlet plug and the second oil outlet plug may include a sealing cone and a tightening nut.

[0013] According to an embodiment of the present invention, the diesel engine fuel supply assembly can be installed on the diesel engine fuel supply assembly sealing test device. The piston sleeve mounting plane is positioned with the fixed plate mounting plane, and the piston drive end face is positioned with the support plate support plane. After positioning, it is ensured that the oil passage of the oil inlet connector is connected with the oil passage of the piston sleeve. After installation, the fuel supply assembly and the test device are connected and fixed by bolts and fastening nuts.

[0014] According to another aspect of the present invention, a method for testing the sealing performance of a diesel engine fuel supply assembly is provided. The method uses the aforementioned diesel engine fuel supply assembly sealing test device to test the sealing performance of the seal between the plunger and the plunger sleeve, comprising the following steps: Step 1: Connecting the high-pressure oil outlet plug and the oil outlet plug to the high-pressure oil outlet connector via threads to ensure no leakage at either high-pressure oil outlet connector; Step 2: Connecting the compressed air or test hydraulic oil device to the oil inlet connector, opening the compressed air or hydraulic oil switch to introduce 3-5 bar of compressed air or hydraulic oil. The compressed air or hydraulic oil enters the plunger cavity through the oil passage of the oil inlet connector, the oil passage of the plunger sleeve, and the oil passage of the oil inlet valve. Under air or oil pressure, a pressure difference is formed between the upper and lower ends of the seal between the plunger and the plunger sleeve. Observing whether there are air bubbles or fuel leaks at the lower end of the seal under this pressure difference, if no air bubbles or fuel leaks occur within 1 minute, the sealing structure of that part of the seal is deemed qualified.

[0015] According to an embodiment of the present invention, when testing the sealing performance of the inlet valve sealing surface, the sealing performance test of the inlet valve sealing surface is carried out under the condition that the sealing ring between the plunger and the plunger sleeve is qualified. The test may include the following steps: Step 3: Connect the high-pressure oil outlet plug to the oil outlet connector to ensure that the oil outlet connector is leak-free; Step 4: Connect the compressed air or test hydraulic oil device to the oil outlet connector, open the compressed air or hydraulic oil switch to introduce 3-5 bar of compressed air or hydraulic oil. The compressed air or hydraulic oil enters the oil plunger cavity through the oil passage of the oil outlet connector and the oil passage of the plunger sleeve. Under air pressure or oil pressure, a pressure difference is formed between the upper and lower ends of the inlet valve assembly. Under the pressure difference, observe whether there are air bubbles or fuel leaks at the oil passage of the oil inlet connector. If no air bubbles or fuel leaks occur within 1 minute, the sealing structure of the inlet valve position is deemed qualified.

[0016] Compared with the prior art, the technical solution provided by the embodiments of the present invention can achieve at least the following beneficial effects:

[0017] The diesel engine fuel supply component sealing performance testing device according to the present invention is unaffected by the environment and operates stably. It can quickly detect the sealing performance requirements of various sealing parts of the fuel supply component, facilitating operators to improve product qualification rates during production. It shortens testing time, increases production efficiency, and provides highly consistent test results. This solution has low manufacturing costs and can meet product technical requirements using existing processing conditions. The present invention can be applied to fuel supply components of different sizes and structures, offering strong product versatility and achieving high-pressure fuel pump technical requirements at low cost and high quality, thus better meeting increasingly stringent emission regulations.

[0018] The diesel engine fuel supply assembly sealing test device of the present invention can test the sealing requirements of multiple parts. It is not easily worn after repeated use, and is easy to assemble, which helps improve product precision and processing efficiency.

[0019] The present invention provides a diesel engine fuel supply component sealing test device and test method, which has the advantages of easy assembly and use and low manufacturing difficulty. By selecting parts such as fixing plates and support plates, it can meet the test requirements of different products, achieve technical requirements, and ensure improved product quality. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0021] Figure 1a This is a cross-sectional schematic diagram showing a diesel engine fuel supply assembly sealing test device according to an embodiment of the present invention;

[0022] Figures 1b-1c This is a perspective view showing a diesel engine fuel supply assembly sealing test device according to an embodiment of the present invention;

[0023] Figure 2a This is a cross-sectional schematic diagram showing the diesel engine fuel supply assembly;

[0024] Figure 2b This is a three-dimensional schematic diagram showing the fuel supply components of a diesel engine;

[0025] Figures 3a-3b This is a perspective view showing a diesel engine fuel supply assembly sealing test device in conjunction with a diesel engine fuel supply assembly according to an embodiment of the present invention;

[0026] Figure 3c yes Figure 3a Top view;

[0027] Figures 4a-4bThis is a schematic cross-sectional view showing the diesel engine fuel supply assembly sealing test device after assembly during testing according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0030] Figure 1a This is a cross-sectional schematic diagram showing a diesel engine fuel supply assembly sealing test device according to an embodiment of the present invention; Figures 1b-1c This is a perspective view showing a diesel engine fuel supply assembly sealing test device according to an embodiment of the present invention; Figure 2a This is a cross-sectional schematic diagram showing the diesel engine fuel supply assembly; Figure 2b This is a three-dimensional schematic diagram showing the fuel supply components of a diesel engine; Figures 3a-3b This is a perspective view showing a diesel engine fuel supply assembly sealing test device in conjunction with a diesel engine fuel supply assembly according to an embodiment of the present invention; Figure 3c yes Figure 3a Top view.

[0031] like Figure 2a and Figure 2b As shown, the diesel engine fuel supply assembly includes: plunger sleeve 23.

[0032] The plunger sleeve 23 has a vertically downward opening, and from top to bottom, it is arranged an inlet valve 24, an inlet valve oil passage 27, a plunger cavity 28, and a plunger 21. A sealing ring 22 is provided near the opening end of the plunger sleeve 23, fitted around the circumference of the plunger 21, for sealing between the plunger 21 and the plunger sleeve 23. The opening end of the plunger sleeve 23 protrudes from the entire plunger sleeve 23, forming a protrusion. The plunger sleeve 23 also has a first plunger sleeve 23 oil passage, which connects to the plunger cavity 28. The plunger 21 is angled axially, with one end connected to the oil inlet valve passage 27; the plunger sleeve 23 is also provided with a horizontal second plunger sleeve passage 210 and an oil outlet valve connector 25 connected to the second plunger sleeve passage 210. The oil outlet valve connector 25 is axially provided with an oil outlet valve connector passage 29. The second plunger sleeve passage 210 is connected to the side wall of the vertically downward opening of the plunger sleeve 23. When the plunger 21 slides downward and the plunger cavity 28 is connected to the second plunger sleeve passage 210, oil is discharged.

[0033] The diesel engine fuel supply component sealing test device is used to test the sealing performance of the diesel engine fuel supply component.

[0034] like Figures 1a to 3c As shown, the diesel engine fuel supply component sealing test device includes: a fixed plate 11 and a support plate 12.

[0035] The fixing plate 11 is used to fix the diesel engine fuel supply assembly in the horizontal direction. The fixing plate 11 is provided with a through hole to accommodate and fix the protrusion of the plunger sleeve 23. The upper surface of the fixing plate 11 is the fixing plate positioning plane 19, which fits and is installed in close contact with the plunger sleeve 23. The fixing plate 11 is provided with a fixing plate U-shaped groove to avoid interference with the outer circle of the plunger sleeve 23. The fixing plate 11 is provided with a fixing plate oil passage 18, which corresponds to the other end of the oil passage of the first plunger sleeve 23.

[0036] The support plate 12 is used to fix the relative position of the plunger 21 and the plunger sleeve 23 in the vertical direction. A T-slot 112 is provided on the support plate 12 for mounting the bottom surface of the plunger 21. The T-slot 112 is provided with a support plate positioning plane 110 for supporting and limiting the end face of the plunger 21.

[0037] The present invention provides a diesel engine fuel supply component sealing test device, which has the advantages of being easy to assemble and use and having low manufacturing difficulty. By selecting parts such as fixing plates and support plates, it can meet the testing requirements of different products, achieve technical requirements, and ensure improved product quality.

[0038] According to one or more embodiments of the present invention, the diesel engine fuel supply assembly sealing test device further includes: an oil inlet connector 16, coaxially mounted on the fixed plate oil passage 18, and an oil inlet connector oil passage 17 coaxially arranged inside the oil inlet connector 16.

[0039] According to one or more embodiments of the present invention, a crescent groove 111 is provided on the support plate 12 near the oil inlet connector 16 to avoid interference with the oil inlet connector 16.

[0040] According to one or more embodiments of the present invention, the diesel engine fuel supply assembly sealing test device further includes: bolts 14 and nuts 13 for connecting and fixing the fixing plate 11 and the support plate 12.

[0041] According to one or more embodiments of the present invention, the diesel engine fuel supply assembly sealing test device further includes: an O-ring 15 disposed on the inner wall of the fixed plate oil passage 18 for sealing the connection between the fixed plate oil passage 18 and the oil passage of the first plunger sleeve 23.

[0042] According to one or more embodiments of the present invention, the diesel engine fuel supply assembly sealing test device further includes: a first oil outlet plug 31 and a second oil outlet plug 32, for threaded connection with the high-pressure oil outlet connector of the diesel engine fuel supply assembly, to ensure that the two high-pressure oil outlet connectors are leak-free.

[0043] According to one or more embodiments of the present invention, the first oil outlet plug 31 and the second oil outlet plug 32 include a sealing cone and a tightening nut.

[0044] According to one or more embodiments of the present invention, the diesel engine fuel supply assembly is installed on the diesel engine fuel supply assembly sealing test device. The plunger sleeve mounting plane 211 is positioned with the mounting plane of the fixing plate 11, and the plunger drive end face 212 is positioned with the support plate 12 support plane. After positioning, it is ensured that the oil passage 17 of the oil inlet connector is connected to the oil passage of the plunger sleeve 23. After installation, the fuel supply assembly and the test device are connected and fixed by bolts 14 and fastening nuts 13.

[0045] The diesel engine fuel supply component sealing performance testing device according to the present invention is unaffected by the environment and operates stably. It can quickly detect the sealing performance requirements of various sealing parts of the fuel supply component, facilitating operators to improve product qualification rates during production. It shortens testing time, increases production efficiency, and provides highly consistent test results. This solution has low manufacturing costs and can meet product technical requirements using existing processing conditions. The present invention can be applied to fuel supply components of different sizes and structures, offering strong product versatility and achieving high-pressure fuel pump technical requirements at low cost and high quality, thus better meeting increasingly stringent emission regulations.

[0046] Figures 4a-4b This is a schematic cross-sectional view showing the diesel engine fuel supply assembly sealing test device after assembly during testing according to an embodiment of the present invention.

[0047] The diesel engine fuel supply component sealing performance test method uses the aforementioned diesel engine fuel supply component sealing performance test device.

[0048] like Figure 4a As shown, when testing the sealing performance of the sealing ring 22 between the plunger 21 and the plunger sleeve 23, the diesel engine fuel supply assembly sealing performance test method includes the following steps:

[0049] Step 1: Connect the high-pressure oil outlet plug and the oil outlet plug to the high-pressure oil outlet connector by thread, ensuring that there is no leakage at the two high-pressure oil outlet connectors;

[0050] Step 2: Connect the compressed air or test hydraulic oil device to the oil inlet connector 16, and turn on the compressed air or hydraulic oil switch to introduce 3-5 bar of compressed air or hydraulic oil. The compressed air or hydraulic oil enters the plunger chamber 28 through the oil passage 17 of the oil inlet connector, the oil passage of the plunger sleeve 23, and the oil passage 27 of the oil inlet valve. Under air pressure or oil pressure, a pressure difference is formed between the upper and lower ends of the sealing ring 22 between the plunger 21 and the plunger sleeve 23. Under the pressure difference, observe whether there are air bubbles or fuel leaks at the lower end of the sealing ring 22. If no air bubbles or fuel leaks occur within 1 minute, the sealing structure of this part of the sealing ring 22 is deemed qualified.

[0051] like Figure 4b As shown, when testing the sealing performance of the sealing surface of the oil inlet valve 24, the sealing performance of the sealing ring 22 between the plunger 21 and the plunger sleeve 23 is tested, and the following steps are included:

[0052] Step 3: Connect the high-pressure oil outlet plug to the oil outlet connector, ensuring that the oil outlet connector is leak-free;

[0053] Step 4: Connect the compressed air or test hydraulic oil device to the oil outlet connector, open the compressed air or hydraulic oil switch to introduce 3-5 bar of compressed air or hydraulic oil. The compressed air or hydraulic oil enters the oil plunger cavity 28 through the oil passage of the oil outlet connector and the oil passage of the plunger sleeve 23. Under air pressure or oil pressure, a pressure difference is formed between the upper and lower ends of the oil inlet valve 24. Under the pressure difference, observe whether there are air bubbles or fuel leaks at the oil passage 17 of the oil inlet connector. If no air bubbles or fuel leaks occur within 1 minute, the sealing structure of the oil inlet valve 24 is deemed qualified.

[0054] The diesel engine fuel supply component sealing test device and method of the present invention can test the sealing requirements of multiple parts. It is not easily worn after repeated use, and is easy to assemble, which helps improve product precision and processing efficiency.

[0055] When in use, the operator can determine whether the product structure is sealed properly based on the test results, thereby ensuring the product's sealing requirements.

[0056] The preferred fixing plate 11 is provided with a plunger sleeve mounting hole, an oil inlet connector 16 mounting hole, an O-ring 15 sealing ring groove, and a fastening bolt 14 mounting hole; the plunger sleeve mounting hole and the plunger sleeve are clearance fit; the oil inlet valve connector is connected by M14×1.5, and the sealing end face of the oil inlet connector is pressed against the threaded bottom hole end face of the fixing plate, with a tightening torque of 40 N•m to ensure that there is no leakage between the oil inlet connector and the upper plate during the test; the O-ring is installed in the sealing ring groove to prevent leakage between the fixing plate and the plunger sleeve mounting end face.

[0057] In actual use, the end face of the M14 threaded bottom hole of the fixing plate and the end face of the oil inlet connector have a hard seal structure. This part is subjected to repeated operation over a long period of time, so it is necessary to ensure the sealing and strength requirements. The fixing plate is made of medium carbon alloy steel 42CrMo, heat treated to 38-42HRC; the oil inlet connector is made of high carbon bearing steel GCr15, heat treated to 58-62HRC.

[0058] The preferred support plate 2 is provided with a plunger end face support plane; the oil supply assembly and the support plate are installed on the fixing plate in the correct position and fixed by M8×70 bolts and nuts. After installation, ensure that the bottom end face of the plunger is in contact with the support plate.

[0059] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention, which is determined by the appended claims.

Claims

1. A diesel engine fuel supply assembly sealing performance testing device, used to test the sealing performance of the diesel engine fuel supply assembly, wherein, The diesel engine fuel supply assembly includes: A plunger sleeve has a vertically downward opening. From top to bottom, it comprises an inlet valve, an inlet valve passage, a plunger cavity, and a plunger. A sealing ring is fitted around the circumference of the plunger near the opening end of the plunger sleeve for sealing between the plunger and the plunger sleeve. The opening end of the plunger sleeve protrudes from the entire plunger sleeve, forming a protrusion. The plunger sleeve also has a first plunger sleeve passage, which is angled to the plunger axis and has one end connected to the inlet valve passage. The plunger sleeve further includes a horizontally oriented second plunger sleeve passage and an outlet valve connector connected to the second plunger sleeve passage. The outlet valve connector has an axially oriented outlet valve connector passage. The second plunger sleeve passage is connected to the side wall of the vertically downward opening of the plunger sleeve. When the plunger slides downward and the plunger cavity connects to the second plunger sleeve passage, oil is discharged. The diesel engine fuel supply assembly sealing test device includes: A fixing plate is used to fix the diesel engine fuel supply assembly in the horizontal direction. The fixing plate has a through hole for accommodating and fixing the protrusion of the plunger sleeve. The upper surface of the fixing plate is a fixing plate positioning plane, which fits snugly with the plunger sleeve. The fixing plate has a U-shaped groove on the lower side to avoid interference with the outer circle of the plunger sleeve. The fixing plate has an oil passage, which corresponds to the other end of the oil passage of the first plunger sleeve. A support plate is used to fix the relative position of the plunger and the plunger sleeve in the vertical direction. A T-slot is provided on the support plate for the bottom surface of the plunger to be installed. The T-slot is provided with a positioning plane of the support plate for supporting and limiting the end face of the plunger.

2. The diesel engine fuel supply assembly sealing test device as described in claim 1, wherein, Also includes: An oil inlet connector is coaxially mounted on the oil passage of the fixed plate, and an oil inlet connector oil passage is coaxially arranged inside the oil inlet connector.

3. The diesel engine fuel supply assembly sealing test device as described in claim 2, wherein, The support plate is provided with a crescent groove near the oil inlet connector to avoid interference with the oil inlet connector.

4. The diesel engine fuel supply assembly sealing test device as described in claim 1, wherein, Also includes: Bolts and nuts are used to connect and secure the fixing plate and the support plate.

5. The diesel engine fuel supply assembly sealing test device as described in claim 1, wherein, Also includes: An O-ring is disposed on the inner wall of the oil passage of the fixed plate for sealing the connection between the oil passage of the fixed plate and the oil passage of the first plunger sleeve.

6. The diesel engine fuel supply assembly sealing test device as described in claim 1, wherein, It also includes: a first oil outlet plug and a second oil outlet plug, used for threaded connection with the high-pressure oil outlet connector of the diesel engine fuel supply assembly to ensure that there is no leakage at the two high-pressure oil outlet connectors.

7. The diesel engine fuel supply assembly sealing test device as described in claim 6, wherein, The first oil outlet plug and the second oil outlet plug include a sealing cone and a tightening nut.

8. The diesel engine fuel supply assembly sealing test device as described in claim 1, wherein, The diesel engine fuel supply assembly is installed on the diesel engine fuel supply assembly sealing test device. The piston sleeve mounting plane is positioned with the fixed plate mounting plane, and the piston drive end face is positioned with the support plate support plane. After positioning, ensure that the oil passage of the oil inlet connector is connected to the oil passage of the piston sleeve. After installation, the fuel supply assembly and test device are connected and fixed by bolts and fastening nuts.

9. A method for testing the sealing performance of a diesel engine fuel supply assembly, wherein, The diesel engine fuel supply component sealing performance test method uses the diesel engine fuel supply component sealing performance test device as described in any one of claims 1-8. When testing the sealing performance of the sealing ring between the plunger and the plunger sleeve, the method includes the following steps: Step 1: Connect the high-pressure oil outlet plug and the oil outlet plug to the high-pressure oil outlet connector by thread, ensuring that there is no leakage at the two high-pressure oil outlet connectors; Step 2: Connect the compressed air or hydraulic oil testing device to the oil inlet connector. Turn on the compressed air or hydraulic oil switch to introduce 3-5 bar of compressed air or hydraulic oil. The compressed air or hydraulic oil enters the plunger cavity through the oil passage of the oil inlet connector, the oil passage of the plunger sleeve, and the oil passage of the oil inlet valve. Under air or oil pressure, a pressure difference is formed between the upper and lower ends of the sealing ring between the plunger and the plunger sleeve. Observe whether there are air bubbles or fuel leaks at the lower end of the sealing ring under the pressure difference. If no air bubbles or fuel leaks occur within 1 minute, the sealing structure of that part of the sealing ring is deemed qualified.

10. The diesel engine fuel supply assembly sealing test method as described in claim 9, wherein, When testing the sealing performance of the inlet valve sealing surface, the sealing performance of the inlet valve sealing surface shall be tested under the condition that the sealing ring between the plunger and the plunger sleeve is qualified. The test includes the following steps: Step 3: Connect the high-pressure oil outlet plug to the oil outlet connector, ensuring that the oil outlet connector is leak-free; Step 4: Connect the compressed air or hydraulic oil testing device to the oil outlet connector, turn on the compressed air or hydraulic oil switch to introduce 3-5 bar of compressed air or hydraulic oil. The compressed air or hydraulic oil enters the oil plunger cavity through the oil passage of the oil outlet connector and the oil passage of the plunger sleeve. Under air pressure or oil pressure, a pressure difference is formed between the upper and lower ends of the oil inlet valve assembly. Under the pressure difference, observe whether there are air bubbles or fuel leaks at the oil passage of the oil inlet connector. If no air bubbles or fuel leaks occur within 1 minute, the sealing structure of the oil inlet valve position is deemed qualified.

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