A general-purpose auxiliary tool for testing the sealing performance of a mechanical fuel injector

Abstract

This utility model discloses a universal auxiliary tool for testing the sealing performance of mechanical injectors, including a base with a horizontal mandrel installed in its mandrel mounting hole; a pressure plate assembly, the pressure plate being axially movable and installed at the end of the mandrel, the end of the mandrel being threadedly connected to a locking nut; at least two sets of V-shaped support adjustment assemblies, spaced apart along the axial direction of the mandrel and slidably fitted onto the mandrel through shaft holes, located between the base and the pressure plate; a pipe joint clamping mechanism, the pipe joint support being axially slidably fitted onto the mandrel, the side facing the base having a pipe joint and a synchronous clamping seal, the sealing end face of the synchronous clamping seal being in sealing fit with the end face of the injector cap, the pipe joint on the pressure plate side having a guide post, a pressure head and a first return spring; a positioning assembly, a pad being fixed to the side of the base facing the pressure plate; and a locking nut adjusting the axial displacement of the pressure plate, driving the pipe joint support to move, so that the synchronous clamping seal is pressed tightly against the end face of the injector cap, meeting the testing needs of different production scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical injector sealing test technology, and in particular relates to a general auxiliary tool for mechanical injector sealing test. Background Technology

[0002] In the manufacturing process of mechanical fuel injectors, sealing testing is a crucial step in ensuring injector quality. Traditional sealing testing methods for mechanical fuel injectors have many drawbacks and are no longer sufficient to meet the demands of modern high-efficiency production.

[0003] Traditional testing methods involve placing the injector in a fuel sump and typically screwing an air intake connector onto one end of the needle valve body to introduce pressurized gas into the injector. The system then observes whether any gas escapes from the injector body to determine its sealing performance. However, this testing method has significant limitations.

[0004] Firstly, only one injector can be tested at a time, making the operation process rather cumbersome. Each test requires the separate installation and removal of the injector's intake manifold connector, which not only increases the workload of the operators but also makes the entire testing process time-consuming, resulting in low testing efficiency and failing to meet the needs of large-scale production.

[0005] Secondly, different injectors require different test fixtures due to their varying sizes and shapes. This means that companies need to manufacture multiple different test fixtures for injectors of different specifications, increasing tooling manufacturing costs. Furthermore, a large number of test fixtures not only occupy storage space but also increase the difficulty and cost of fixture management.

[0006] Furthermore, existing test fixtures are often only suitable for injectors of specific lengths and diameters when positioning them, lacking versatility for injectors of different lengths and diameters. When testing injectors of different specifications, existing fixtures cannot accurately and stably position the injectors, leading to inaccurate test results and potentially damaging the injectors.

[0007] In summary, existing methods for testing the sealing performance of mechanical injectors suffer from problems such as cumbersome operation, low efficiency, high tooling manufacturing costs, and poor fixture versatility. Therefore, it is necessary to develop a universal auxiliary tool for testing the sealing performance of mechanical injectors that can meet the positioning requirements of injectors of different lengths and diameters, improve testing efficiency, and reduce tooling manufacturing costs. Utility Model Content

[0008] To address the problems existing in the prior art, this utility model provides a universal auxiliary tool for mechanical injector sealing performance testing that can meet the positioning requirements of injectors of different lengths and diameters, improve testing efficiency, and reduce tooling manufacturing costs.

[0009] This utility model is implemented as follows: a universal auxiliary tool for testing the sealing performance of mechanical injectors, characterized by comprising: a base, wherein a horizontal mandrel is axially extended within a central mandrel mounting hole; a pressure plate assembly, comprising a pressure plate axially movable and mounted on the end of the mandrel, and a locking nut threadedly connected to the end of the mandrel; at least two sets of V-shaped support adjustment assemblies spaced axially along the mandrel, each V-shaped support adjustment assembly being slidably fitted onto the mandrel via a shaft hole and located between the base and the pressure plate; and a pipe joint clamping mechanism, comprising a pipe joint support axially slidably fitted onto the mandrel, wherein the pipe joint support... A pipe joint is provided on the side of the base facing the base, and a synchronous pressing seal is provided on the pipe joint. The sealing end face of the synchronous pressing seal is in sealing fit with the end face of the injector cap of the mechanical injector. A guide post of the pipe joint on the pressure plate side is inserted into the pipe joint support, and a pressure head is installed at the end of the guide post. The pipe joint support and the end pressure head are provided with a first return spring. The positioning assembly includes a pad fixedly set on the side of the base facing the pressure plate. The locking nut drives the pipe joint support to move axially along the mandrel by adjusting the axial displacement of the pressure plate. The pipe joint support drives the pipe joint to move axially, thereby pressing the sealing gasket against the end face of the injector cap.

[0010] More preferably, the V-shaped support adjustment assembly includes: a support body with V-shaped openings symmetrically arranged on both sides for positioning the mechanical injector housing; a vertical guide structure consisting of vertical grooves symmetrically opened on the support body; a T-shaped adjustment block that is vertically mounted in the vertical groove, with oblong holes symmetrically arranged on both sides of the vertical groove penetrating the support body; a transverse locking bolt that passes through the oblong holes and is threadedly connected to the T-shaped adjustment block; a plug-in portion formed on the top of the T-shaped adjustment block that is adapted to be inserted into an axial groove opened on the bottom surface of the mandrel; and a radial locking bolt provided on the mandrel corresponding to the position of the plug-in portion.

[0011] More preferably, the connection end between the mandrel and the base is provided with a threaded connection section, and locking nuts that cooperate with the threaded connection section are provided on both sides of the base.

[0012] More preferably, the contact section between the mandrel and the base is provided with an anti-rotation engagement structure, the anti-rotation engagement structure comprising:

[0013] At least one axially extending limiting plane formed on the outer periphery of the mandrel; a matching plane formed on the inner wall of the mounting hole of the base;

[0014] More preferably, a handle is installed on the upper surface of the mandrel.

[0015] More preferably, the locking nut threaded to the end of the mandrel is a wing nut.

[0016] More preferably, a first spherical washer is provided on the inner side of the pressure plate, and a second return spring is provided between the spherical washer and the first shoulder of the mandrel.

[0017] More preferably, a second spherical washer is provided between the locking nut and the pressure plate.

[0018] More preferably, the bottom of the base and the lower surface of the mandrel are provided with foot bolts; used to adjust the distance and levelness of the mandrel from the oil sump.

[0019] More preferably, the end of the pressure head has a spherical structure to ensure that the pressure plate can simultaneously press against the two injectors.

[0020] The advantages and technical effects of this utility model are as follows: This utility model's universal auxiliary tool for testing the sealing performance of mechanical injectors constructs a highly efficient and precise testing platform through structural innovation and functional integration: It employs a main load-bearing frame with a precise fit between the base and the spindle to achieve absolute horizontal positioning; combined with an axially adjustable design to adapt to multiple injector specifications; and featuring a dual positioning mechanism of axial sliding and radial adjustment, along with an anti-slip structure, using a V-shaped support assembly to form an adaptive support system to reduce the risk of off-center loading; by driving the pressure plate assembly with a locking nut, it links the pipe joint clamping mechanism with the synchronously clamping sealing element, achieving high-precision surface contact sealing; and integrates a return spring and a floating guide column compensation mechanism. Tolerances are carefully controlled to ensure uniform pressure distribution during sealing. The synchronously tightening seal adopts a combined structure compatible with both planar and conical seals. The sealing gasket and floating pressure head further optimize positioning accuracy and force uniformity, while the closed-loop pressure transmission design enhances sealing reliability. All components of the auxiliary fixtures use standardized interfaces to enable tool-less rapid changeover. Key components undergo high-strength alloy and surface hardening treatment to enhance durability. Ultimately, a universal solution with high-precision positioning, self-adaptive support, and force-position synergistic sealing characteristics is formed, effectively solving the technical problems of poor sealing reliability, weak specification adaptability, and complex operation of traditional equipment, and significantly improving testing efficiency and quality. Attached Figure Description

[0021] Figure 1 This is the front view of this utility model;

[0022] Figure 2 This is a top view of the present invention;

[0023] Figure 3 yes Figure 1 Sectional view of AA;

[0024] Figure 4 yes Figure 1 BB section view;

[0025] Figure 5 yes Figure 1 CC section view;

[0026] Figure 6 This is a diagram showing the usage state of this utility model.

[0027] In the picture:

[0028] 1. Base; 1-1. Mandrel mounting hole; 12. Matching plane; 2. Mandrel; 21. Handle; 22. Limiting plane; 23. Axial groove; 24. Threaded connection section; 3. Pressure plate; 31. First spherical washer; 32. Second return spring; 4. Locking nut; 41. Second spherical washer; 5. V-shaped support adjustment assembly; 51. Support body; 52. V-shaped opening; 53. Vertical groove; 530. Waist-shaped hole; 54. T-shaped adjusting block; 55. Lateral locking bolt; 56. Insertion part; 57. Axial locking bolt; 6. Pipe joint support; 61. Guide column; 62. Pressure head; 63. First return spring; 64. Pipe joint; 7. Synchronous pressing seal; 71. Sealing end face; 8. Gasket; 9. Mechanical injector; 91. Injector large end face; 92. Injector tight cap end face; 10. Adjusting foot bolt; 11. Oil sump. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0030] Please see Figures 1 to 6 A general-purpose auxiliary tool for testing the sealing performance of mechanical injectors includes: a base 1, in which a horizontal mandrel 2 extends axially within a central mandrel mounting hole 1-1; the base 1 serves as the basic support structure for the entire auxiliary tool, providing a stable mounting position for the mandrel 2. Its rational structural design ensures that the mandrel 2 can accurately maintain a horizontal state. Simultaneously, the tight fit between the mandrel mounting hole 1-1 and the mandrel 2 effectively prevents the mandrel 2 from shaking during operation, ensuring the accuracy and reliability of the entire testing process and laying a solid foundation for the sealing performance testing of the mechanical injector 9. The base 1 can be adjusted within a certain range on the mandrel 2 to meet the axial positioning requirements of mechanical injectors of different lengths.

[0031] The pressure plate assembly includes a pressure plate 3 axially movable at the end of the mandrel 2 and a locking nut 4 threadedly connected to the end of the mandrel 2; it allows for adjustment of the base's position on the mandrel to meet different injector length requirements. The locking nut 4 is threaded to the end of the mandrel 2; rotating the locking nut 4 causes axial displacement of the pressure plate 3, thereby clamping different specifications of mechanical injectors 9. This clamping method is simple and convenient, improving testing efficiency.

[0032] At least two sets of V-shaped support adjustment components 5 are axially spaced along the spindle 2. Each V-shaped support adjustment component 5 is slidably fitted onto the spindle 2 through a shaft hole and is located between the base 1 and the pressure plate 3. The V-shaped structure design of the V-shaped support adjustment component 5 can better adapt to mechanical injectors 9 of different diameters and provide stable support. The slidable fitting onto the spindle 2 through the shaft hole allows each component to be adjusted axially according to the actual size of the mechanical injector 9. In addition, the V-shaped support body 51 is fixed to the T-shaped adjustment block 54 with screws 55 through the oblong hole 530. The distance from the V-shaped support body 51 to the center of the spindle 2 can be adjusted, meeting the versatility requirements of the auxiliary tool for injectors of different outer diameters.

[0033] The pipe fitting clamping mechanism includes a pipe fitting support 6 that is axially slidably mounted on the spindle 2. The pipe fitting support 6 has a pipe fitting 64 on the side facing the base 1. The upper part of the pipe fitting 64 is provided with a synchronous clamping seal 7. The sealing end face 71 of the synchronous clamping seal 7 is in sealing cooperation with the injector cap end face 92 of the mechanical injector 9.

[0034] A guide post 61 is inserted into the pipe joint 64 on the side of the pressure plate 3. The end of the guide post 61 is provided with a pressure head 62. A first return spring 63 is provided between the pipe joint support 6 and the pressure head 62. The positioning assembly includes a pad 8 fixedly set on the side of the base 1 facing the pressure plate 3. The pad 8 cooperates with the large end face 91 of the mechanical injector 9. The locking nut 4 drives the pipe joint support 6 to move axially along the spindle 2 by adjusting the axial displacement of the pressure plate 3, so that the synchronous pressing seal 7 is sealed and fitted with the end face of the injector cap.

[0035] The technical effect of the pipe fitting clamping mechanism: By adjusting the locking nut 4, the coordinated movement of components such as the pressure plate 3 and the pipe fitting support 6 is achieved, so that the synchronously clamping sealing element 7 is pressed tightly against the corresponding end face of the mechanical injector 9, forming a sealing test chamber. This coordinated working method not only improves the versatility and applicability of the auxiliary tool, meeting the testing requirements of mechanical injectors 9 of different specifications, but also ensures the stability and accuracy of the testing process, greatly improving the efficiency and quality of mechanical injector sealing tests.

[0036] More preferably, the V-shaped support adjustment component 5 includes: V-shaped openings 52 symmetrically arranged on both sides of the support body 51, which can accurately position the housings of mechanical injectors 9 of different diameters, ensuring that the injectors are in a stable and accurate position during the test, effectively avoiding test errors caused by inaccurate positioning, and improving the accuracy and reliability of the test.

[0037] The vertical guide structure consists of symmetrical vertical grooves 53 on the support body 51, providing a stable lifting guide for the T-shaped adjusting block 54. This design allows the T-shaped adjusting block 54 to rise and fall smoothly within the vertical grooves 53, thus enabling flexible adjustment according to the actual center height of the mechanical injector 9, further enhancing the versatility of the auxiliary tool for injectors of different specifications.

[0038] The T-shaped adjusting block 54, which is height-adjustable and installed within the vertical slide groove 53, works in conjunction with the oblong holes symmetrically arranged on both sides of the vertical slide groove 53 that penetrate the support body 51, and the transverse locking bolt 55 passing through the oblong holes and threadedly connected to the T-shaped adjusting block 54. This structure ensures the T-shaped adjusting block 54 is securely fixed within the vertical slide groove 53. The operator can rotate the transverse locking bolt 55 as needed to move the T-shaped adjusting block 54 to the appropriate position within the vertical slide groove 53 and lock it in place, thereby precisely adjusting the support height for the mechanical injector 9 to meet the testing requirements of different injectors.

[0039] The insertion portion 56 formed at the top of the T-shaped adjusting block 54 is adapted to be inserted into the axial sliding groove 23 opened on the bottom surface of the spindle 2. This insertion structure enables a reliable connection and positioning between the T-shaped adjusting block 54 and the spindle 2. At the same time, the radial locking bolt 57 provided on the spindle 2 at the position corresponding to the insertion portion 56 can firmly fix the T-shaped adjusting block 54 and the spindle 2, preventing relative sliding between the T-shaped adjusting block 54 and the spindle 2 during testing, and ensuring the stability and reliability of the entire auxiliary structure.

[0040] In summary, the V-shaped support adjustment assembly 5, through the coordinated operation of its various parts, achieves precise positioning, flexible height adjustment, and stable support for mechanical injectors 9 of different specifications. This greatly improves the versatility, stability, and testing accuracy of the general auxiliary tool for mechanical injector sealing tests, effectively meeting the testing needs of different production scenarios and improving testing efficiency and quality.

[0041] Preferably, the connection end between the mandrel 2 and the base 1 is provided with a threaded connection section 24, and locking nuts 25 that cooperate with the threaded connection section 24 are provided on both sides of the base 1. This can securely connect the mandrel and the base, facilitate disassembly and adjustment, and ensure the stability of the auxiliary structure and the accuracy of testing.

[0042] Further preferably, the contact section between the mandrel 2 and the base 1 is provided with an anti-rotation mating structure, which includes: at least one axially extending limiting plane 22 formed on the outer periphery of the mandrel 2; and a matching plane 12 formed on the inner wall of the mounting hole 11 of the base. This effectively prevents the mandrel from rotating during operation. This ensures the stability of the entire auxiliary fixture structure, ensures the accurate positioning of each component, avoids test errors caused by mandrel rotation, improves the accuracy and reliability of the mechanical injector sealing test, and ensures the smooth progress of the test.

[0043] Preferably, a handle 21 is installed on the upper surface of the mandrel 2. This facilitates the operator in picking up and moving the auxiliary tool, improves the ease of use of the tool, reduces labor intensity, and increases work efficiency.

[0044] Preferably, the locking nut 4 threaded to the end of the mandrel 2 is a wing nut. Its unique shape allows operators to quickly tighten or loosen it by hand, improving work efficiency and reducing operational difficulty.

[0045] Preferably, the inner side of the pressure plate 3 is provided with a first spherical washer 31, and a second return spring 32 is provided between the first spherical washer 31 and the first shoulder of the spindle 2. The spherical washer 31 can adaptively adjust its angle to ensure that the pressure plate can simultaneously press the two injectors. The return spring can automatically reset the pressure plate after testing, facilitating the next operation. The two work together to improve the sealing effect, enhance the convenience and reliability of the auxiliary tool, and extend its service life.

[0046] Preferably, a second spherical washer 41 is provided between the locking nut 4 and the pressure plate 3. This effectively compensates for any axial or angular deviations that may occur between the locking nut 4 and the pressure plate 3 during installation, ensuring a tight fit and uniform force distribution. This helps improve the locking effect, prevents loosening, and ensures stable clamping of the mechanical injector by the pressure plate 3. Simultaneously, the spherical washer can self-adjust, reducing stress concentration and improving the overall reliability and service life of the fixture.

[0047] More preferably, the bottom of the base and the lower surface of the mandrel are provided with foot bolts 10 for adjusting the distance and levelness of the mandrel from the bottom of the oil tank.

[0048] More preferably, the end of the pressure head has a spherical structure, which allows the pressure head to better withstand the axial force of the pressure plate.

[0049] Instructions for use: First, rotate the pressure plate to the vertical position. Then, move the pipe fitting support to the right a certain distance. Next, place the injector on the V-shaped opening of the V-shaped support adjustment assembly, with the left end tightly against the pad 8. After the injector is in place, move the pipe fitting support to the left until the synchronous pressing seal is close to the end face of the injector cap. Then, rotate the pressure plate to the horizontal position and tighten the wing nut to make the synchronous pressing seal tightly against the end face of the injector cap. Turn on the air intake switch to perform the injector sealing test.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A universal auxiliary tool for testing the sealing performance of mechanical fuel injectors, characterized in that, include: The base has a horizontal spindle that extends axially within the central spindle mounting hole. The pressure plate assembly includes a pressure plate axially movable to the end of the mandrel and a lock nut threadedly connected to the end of the mandrel; At least two sets of V-shaped support adjustment components are spaced apart along the axial direction of the mandrel. Each V-shaped support adjustment component is slidably fitted onto the mandrel through a shaft hole and is located between the base and the pressure plate. The pipe fitting clamping mechanism includes a pipe fitting support that is axially slidably mounted on the mandrel. A pipe fitting is provided on the side of the pipe fitting support facing the base. A synchronous clamping seal is provided on the pipe fitting. The sealing end face of the synchronous clamping seal is in sealing engagement with the end face of the injector cap of the mechanical injector. A guide post of the pipe fitting on the pressure plate side is inserted into the pipe fitting support. A pressure head is installed at the end of the guide post. A first return spring is provided on the pipe fitting support and the end pressure head. The positioning component includes a pad block fixedly disposed on the side of the base facing the pressure plate; The locking nut, by adjusting the axial displacement of the pressure plate, drives the pipe joint support to move axially along the mandrel, and the pipe joint support drives the pipe joint to move axially, thereby pressing the sealing gasket against the end face of the injector cap.

2. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: The V-shaped support adjustment component includes: The support body has V-shaped openings symmetrically arranged on both sides for positioning the mechanical injector housing; The vertical guide structure is composed of vertical grooves symmetrically opened on the support body; A T-shaped adjustment block is installed in the vertical slide groove, and waist-shaped holes penetrating the support body are symmetrically arranged on both sides of the vertical slide groove. A transverse locking bolt passes through the oblong hole and is threadedly connected to the T-shaped adjusting block; The top of the T-shaped adjusting block has an insertion part that is adapted to be inserted into the axial groove opened on the bottom surface of the spindle; The mandrel is provided with a radial locking bolt at the position corresponding to the insertion part.

3. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: The mandrel is provided with a threaded connection section at the connection end with the base, and locking nuts that cooperate with the threaded connection section are provided on both sides of the base.

4. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: The contact section between the mandrel and the base is provided with an anti-rotation fitting structure, the anti-rotation fitting structure including: At least one axially extending limiting plane formed on the outer periphery of the mandrel; a matching plane formed on the inner wall of the mounting hole of the base.

5. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: A handle is installed on the upper surface of the mandrel.

6. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: The locking nut threaded to the end of the mandrel is a wing nut.

7. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: The inner side of the pressure plate is provided with a first spherical washer, and a second return spring is provided between the spherical washer and the first shoulder of the mandrel.

8. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: A second spherical washer is provided between the locking nut and the pressure plate.

9. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: The base bottom and the lower surface of the spindle are provided with foot bolts.

10. The universal auxiliary tool for testing the sealing performance of mechanical injectors according to claim 1, characterized in that: The end of the pressure head has a spherical structure.

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