A water tightness detection fixture for injector seat
By designing the watertightness detection fixture of the injector seat, high-pressure gas is used to inject it into the cavity of the injector seat, simulating the high-pressure state, observing the bubbles in the water to detect the risk of leakage, it solves the problem of difficulty in accurately detecting the watertightness of the injector seat in the prior art, and achieving efficient and accurate watertightness detection, reducing defective yield and production costs.
Patent Information
- Application Number
- CN202420666008.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-04-02
AI Technical Summary
The prior art is difficult to accurately detect the watertightness of the injector seat before welding and assembly of the injector seat and the oil rail, resulting in difficult to identify and remove leakage defective parts.
A watertightness detection fixture for the injector seat is designed, including a base plate, baffle, plug assembly, inner hole positioning pipe and sealing block. It is injected into the inner cavity of the injector seat through high-pressure gas, simulates the high-pressure state, and observes bubbles in the water to detect leakage risks.
It realizes efficient and accurate detection of watertightness of the fuel injector seat, and can identify and eliminate unqualified leaked defective parts before welding and assembly, reducing defective product rate and production costs.
Smart Images
Figure CN222719112U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fuel injector seat detection, in particular to a fuel injector seat water tightness detection fixture. Background Art
[0002] The injector seat is one of the important components connecting the automobile engine to the oil rail. It is under high pressure when working. Therefore, the manufacturing material and processing technology requirements of the injector seat are relatively high, and the injector seat does not allow leakage.
[0003] In the existing processing and manufacturing process, the overall air tightness test of the welded assembly is usually carried out after the injector seat and the oil rail distribution pipe are welded to check whether there is a leakage problem in the welded assembly. However, at this time, since the target is the assembly that has been welded, and the air tightness detection equipment is used for detection during the detection process, when the air tightness of the product is detected, it will be difficult for us to determine whether the gas leakage point exists on the injector seat, the oil rail distribution pipe, or the weld area between the injector seat and the oil rail distribution pipe. If the injector seat can be tested before the injector seat and the oil rail are welded and assembled, and the defective leaking parts that do not meet the requirements are removed in advance, the defective product rate can be reduced and the production cost can be reduced.
[0004] To this end, we need to develop and design a set of inspection fixtures for the injector seat itself to effectively detect whether there are any leakage defects in the injector seat. Utility Model Content
[0005] The purpose of the utility model is to provide a water tightness detection fixture for a fuel injector seat, which is used to solve the technical problems of clamping and blocking the through hole and port of the fuel injector seat during the water tightness detection process and realizing that gas can be injected into the inner cavity of the fuel injector seat. The utility model has a simple structure, convenient operation, high efficiency and simplicity.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A water tightness detection fixture for a fuel injector seat comprises a bottom plate, and a baffle plate and a plug assembly are arranged on the upper end of the bottom plate. A plurality of inner hole positioning through pipes extending longitudinally are arranged between the baffle plate and the plug assembly on the bottom plate, and an outer hole sealing block is arranged on the upper end of the radial bottom plate of the outer wall of the inner hole positioning through pipe. The upper and lower ends of the inner hole positioning through pipe are connected, so that high-pressure gas can pass through.
[0008] The plug assembly includes a guide plate and a plurality of sealing plugs; the sealing plug is connected to one end of the guide plate that positions the through pipe toward the inner hole; a plane sealing ring is also provided on one end of the sealing plug that positions the through pipe toward the inner hole;
[0009] It also includes a limiting guide block and a tightening screw for pushing the plug assembly toward the baffle; the limiting guide block is fixedly connected to the upper end of the bottom plate, and the tightening screw is threadedly connected to the limiting guide block;
[0010] It also includes a clamping rod and a locking component; the locking component includes a locking pressure head and a locking screw connected to the lower end of the locking pressure head; one end of the clamping rod is provided with a plug hole that passes through from top to bottom;
[0011] The other end of the pressing rod is hinged to the bottom plate or to a connecting rod connected to the upper end of the bottom plate;
[0012] The locking screw is threadedly connected with the bottom plate after passing through the insertion hole, or is threadedly connected with two connecting rods connected to the upper end of the bottom plate after passing through the insertion hole.
[0013] Furthermore, an inner hole sealing ring is radially arranged on the outer wall of the inner hole positioning through pipe, the inner hole sealing ring and the outer hole sealing block are distributed up and down, and the outer diameter of the inner hole sealing ring is smaller than the outer diameter of the outer hole sealing block.
[0014] Furthermore, it also includes a guide plate limiting pin, one end of which is fixedly connected to the guide plate, and the other end is inserted into a limiting hole arranged on the limiting guide block.
[0015] Furthermore, two guide slots are provided on the limiting guide block, and the symmetrical ends of the guide plate are respectively placed in one guide slot.
[0016] Furthermore, a positioning protrusion end is provided in the middle of the planar sealing ring.
[0017] Furthermore, an injector seat support block is connected to the base plate, and the injector seat support block is located at the lower end of the outer hole sealing block; a ventilation cavity is provided inside the injector seat support block, and the lower end port of the inner hole positioning tube is connected to the ventilation cavity; the ventilation cavity is provided with an air inlet, and the air inlet is located on the side wall of the injector seat support block; an air inlet connector is connected to the air inlet.
[0018] Furthermore, a plurality of clamping rod notches are provided at the left end or the right end of the clamping rod; when the clamping rod is in a pressed-down state, the clamping rod notches are located above the space between two adjacent inner hole positioning through tubes.
[0019] Furthermore, the upper end surface of the outer hole sealing block is an arc concave surface.
[0020] Compared with the prior art, the utility model provides a fuel injector seat water tightness detection fixture, which has the following beneficial effects:
[0021] The utility model can be used to detect the leakage of the fuel injector seat alone, so a method for detecting the water tightness of the fuel injector seat using the utility model is also disclosed. During operation, the inner hole positioning tube is connected to the external high-pressure gas source; the fuel injector seat is placed between the baffle and the plug assembly, and the inner hole positioning tube is inserted into the through hole on the side wall of the fuel injector seat, the clamping rod presses the fuel injector seat downward, and the outer hole opening of the through hole on the side wall of the fuel injector seat is close to the outer hole sealing block and blocked. At the same time, the plug assembly pushes from the side toward the port at the end of the fuel injector seat to block the port of the fuel injector seat. Finally, the entire detection fixture is placed in water, and high-pressure gas is injected into the inner cavity of the fuel injector seat through the inner hole positioning tube to simulate a high-pressure state in the inner cavity of the fuel injector seat. We can observe the bubbles in the water to observe whether bubbles emerge on the outer wall of the fuel injector seat under the high-pressure state. If bubbles emerge on the outer wall of the fuel injector seat, it means that the fuel injector seat has a leakage risk and is an unqualified leakage defective part. The above operation can detect the injector seat that has leakage risk.
[0022] At the same time, in the utility model, the tightening screw is responsible for pushing the plug assembly toward the baffle; and the tightening screw is threadedly connected to the limiting guide block. This threaded connection method can better control and adjust the pushing depth of the tightening screw on the plug assembly.
[0023] At the same time, in the utility model, an inner hole sealing ring is also provided in the radial direction of the outer wall of the inner hole positioning through pipe, and the inner hole sealing ring and the outer hole sealing block are distributed up and down, and the outer diameter of the inner hole sealing ring is smaller than the outer diameter of the outer hole sealing block. During operation, the inner hole sealing ring is placed in the through hole on the side wall of the injector seat, which further enhances the blocking effect of the through hole and can further prevent the high-pressure gas from leaking out from the through hole under high-pressure state.
[0024] The utility model has the advantages of simple structure and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 The utility model is a structural schematic diagram of an existing fuel injector seat.
[0026] Figure 2 The utility model is a three-dimensional structural schematic diagram of a water tightness detection fixture for a fuel injector seat.
[0027] Figure 3 The utility model is a schematic diagram of the top view of the water tightness detection fixture of the fuel injector seat.
[0028] Figure 4 The utility model is a schematic diagram of the side structure of the water tightness detection fixture of the fuel injector seat.
[0029] Figure 5 The utility model is a schematic diagram of the side view of the water tightness detection fixture of the fuel injector seat (after the baffle is removed).
[0030] In the picture:
[0031] 10-bottom plate, 20-baffle, 30-clamping rod, 31-clamping rod notch, 32-jack, 33-locking pressure head, 34-locking screw, 35-connecting rod one, 36-connecting rod two, 37-fixing pin, 40-limiting guide block, 41-tension screw, 42-guide plate, 43-sealing plug, 44-guide slide groove, 45-flat sealing ring, 46-positioning protruding end, 47-guide plate limiting pin, 50-injector seat support block, 51-intake connector, 52-inner hole positioning through pipe, 53-outer hole sealing block, 54-inner hole sealing ring, 60-injector seat, 61-through hole, 62-port. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0033] like Figure 2-Figure 5 As shown, the utility model provides a water tightness detection fixture for a fuel injector seat. Figure 2 As shown, the water tightness detection fixture includes a base plate 10, and a baffle 20 and a plug assembly are arranged on the upper end of the base plate 10 and are distributed on the left and right; a plurality of longitudinally extending inner hole positioning tubes 52 are arranged on the upper end of the base plate 10 between the baffle 20 and the plug assembly, and an outer hole sealing block 53 is also arranged radially on the outer wall of the inner hole positioning tube 52; the upper and lower ends of the inner hole positioning tube 52 are connected.
[0034] In this embodiment, the upper and lower ends of the inner hole positioning tube 52 are connected, and high-pressure gas can pass through. That is, when the lower port of the inner hole positioning tube 52 is connected to an external high-pressure gas source, the high-pressure gas can flow into the inner cavity of the inner hole positioning tube 52 from the lower port of the inner hole positioning tube 52, and flow out from the upper port of the inner hole positioning tube 52.
[0035] like Figure 3 , 4 As shown in Figure 5, in this embodiment, the plug assembly includes a guide plate 42 and a plurality of sealing plugs 43; the sealing plug 43 is connected to one end of the guide plate 42 that is positioned toward the inner hole through pipe 52; a plane sealing ring 45 is also provided on one end of the sealing plug 43 that is positioned toward the inner hole through pipe 52. For this purpose, the inner hole positioning through pipe 52 is located between the baffle 20 and the plane sealing ring 45.
[0036] The plug assembly can move back and forth in a straight line toward the baffle 20. During operation, the plug assembly is pushed toward the baffle 20 to lock the injector seat 60 between the baffle 20 and the plane sealing ring 45, and each inner hole positioning through tube 52 is inserted into a through hole 61 on the side wall of the injector seat; the outer opening of the through hole 61 is tightly attached to the upper end of the outer hole sealing block 53, blocking the outer opening of the through hole 61. The plane sealing ring 45 presses the port 62 tightly to block the port 62. In this embodiment, the plane sealing ring 45 and the outer hole sealing block 53 are both made of silicone.
[0037] Furthermore, the watertightness detection fixture further includes a limiting guide block 40 and a tightening screw 41 for pushing the plug assembly toward the baffle 20; the limiting guide block 40 is fixedly connected to the upper end of the bottom plate 10, and the tightening screw 41 is threadedly connected to the limiting guide block 40. This threaded connection method can better control and adjust the pushing depth of the tightening screw 41 on the plug assembly.
[0038] Furthermore, the watertightness detection fixture also includes a pressing rod 30 and a locking component. Figure 5 As shown, in this embodiment, the left end of the clamping rod 30 is hinged to the connecting rod 1 35 connected to the upper end of the bottom plate 10. The lower end of the connecting rod 1 35 is fixedly connected to the bottom plate 10, and the upper end of the connecting rod 1 35 is hinged to the left end of the clamping rod 30. In this way, the clamping rod 30 is indirectly connected to the bottom plate 10, and the clamping rod 30 can be turned over. Of course, the left end of the clamping rod 30 can also be directly hinged to the bottom plate 10, for example, when the left end of the clamping rod 30 is bent and extended downward, the bent extension is directly hinged to the bottom plate 10.
[0039] By the hinged connection, the clamping rod 30 can be movably turned relative to the bottom plate 10. When the clamping rod 30 is turned to the left, the space above the inner hole positioning through pipe 52 is released, and the through hole 61 on the injector seat 60 can be more conveniently aligned with the inner hole positioning through pipe 52 for insertion, thereby realizing rapid and rough positioning.
[0040] In this embodiment, the locking component includes a locking head 33 and a locking screw 34 connected to the lower end of the locking head 33; the right end of the pressing rod 30 is provided with a plug hole 32 that passes through from top to bottom. When the right end of the pressing rod 30 is reset to the right and pressed down, the locking screw 34 can be inserted into the plug hole 32 from top to bottom, and then the lower part of the locking screw 34 is screwed into the threaded hole set at the upper end of the second connecting rod 36, so that the locking screw 34 and the second connecting rod 36 are threadedly connected.
[0041] In this embodiment, the lower end of the second connecting rod 36 is fixedly connected to the bottom plate 10 via a fixing pin 37 .
[0042] As the lower part of the locking screw 34 is continuously screwed into the threaded hole, the lower end of the locking head 33 presses down against the upper end of the clamping rod 30, and finally the right end of the clamping rod 30 is tightly locked between the lower end of the locking head 33 and the upper end of the second connecting rod 36. At the same time, as the locking screw 34 is continuously screwed into the threaded hole, the clamping rod 30 also continuously presses the injector seat 60 downward toward the outer hole sealing block 53, and the outer opening of the through hole 61 is also blocked more tightly.
[0043] Of course, we can also choose to directly set the threaded hole at the upper end of the base plate 10, and screw the lower part of the locking screw 34 directly into the threaded hole set at the upper end of the base plate 10. However, this solution will lack the supporting and limiting effect of the upper end of the connecting rod 2 36 on the lower end of the clamping rod 30.
[0044] Preferably, in this embodiment, an inner hole sealing ring 54 is further provided in the radial direction of the outer wall of the inner hole positioning through pipe 52, and the inner hole sealing ring 54 and the outer hole sealing block 53 are distributed up and down, and the outer diameter of the inner hole sealing ring 54 is smaller than the outer diameter of the outer hole sealing block 53. Figure 5 shown.
[0045] During operation, the inner hole sealing ring 54 is inserted into the through hole 61 on the side wall of the injector seat 60, further enhancing the sealing effect of the through hole 61. After the high-pressure gas is continuously inserted into the inner cavity of the injector seat from the inner hole positioning tube 52, it can better prevent the high-pressure gas from leaking out from the through hole 61 under high-pressure state.
[0046] Furthermore, the watertightness detection fixture also includes a guide plate limit pin 47, one end of which is fixedly connected to the guide plate 42, and the other end is inserted into a limit hole provided on the limit guide block 40. Figure 2 The guide plate limit pin 47 is slidably connected to the limit hole; when the guide plate 42 moves back and forth toward the baffle 20, one end of the guide plate limit pin 47 is placed in the limit hole to play a limiting role, which can better prevent the guide plate 42 from lateral deviation during the forward and backward movement, so that the sealing plug 43 can block the port 62 more accurately.
[0047] At the same time, in order to prevent the guide plate 42 from shifting upward during movement, two guide slots 44 are provided on the limit guide block 40, and the symmetrical ends of the guide plate 42 are respectively placed in a guide slot 44. Figure 2 shown.
[0048] Preferably, in this embodiment, a positioning protrusion 46 is further provided in the middle of the planar sealing ring 45. When the plug 43 is pushed toward the port 62, the protrusion 46 is first aligned with the port 62 and inserted therein, and then the planar sealing ring 45 is pressed against the port portion of the injector seat 60 to seal the port 62. The positioning protrusion 46 can play a preliminary positioning role.
[0049] Preferably, a plurality of pressing rod notches 31 are provided at one end of the pressing rod 30. Figure 2 , 3 As shown, when the clamping rod 30 is pressed down, the clamping rod notch 31 is located above the space between two adjacent inner hole positioning through-tubes 52. When the water tightness test starts, due to the existence of the clamping rod notch 31, there is less obstruction to the view above the injector seat 60, and the side wall of the injector seat 60 can be better observed through the clamping rod notch 31 to check whether bubbles emerge on the side wall of the injector seat 60 and better understand the location of the emerging bubbles.
[0050] Preferably, an injector seat support block 50 may be further provided on the bottom plate 10, and the injector seat support block 50 may be provided at the lower end of the outer hole sealing block 53. In this embodiment, a groove is provided at the upper end of the injector seat support block 50, and the lower end of the outer hole sealing block 53 is placed in the groove; and the upper end of the outer hole sealing block 53 protrudes upward from the groove opening, that is, is located above the groove opening, such as Figure 5 shown.
[0051] At the same time, if Figure 5 As shown, in this embodiment, the upper end surface of the outer hole sealing block 53 is a circular arc concave surface, which can better fit with the outer wall of the injector seat 60.
[0052] The support block 50 of the fuel injector seat is provided with a ventilation cavity (not shown in the drawings), and the lower port of the inner hole positioning tube 52 is connected to the ventilation cavity; the ventilation cavity is provided with an air inlet, and the air inlet is located on the side wall of the support block 50 of the fuel injector seat; the air inlet is connected to an air inlet connector 51, and the air inlet connector 51 is used to connect to an external high-pressure air pipe. During the test, the high-pressure gas is input into the air inlet connector 51 from the external high-pressure air pipe, then enters the ventilation cavity, and then enters the inner cavity of the inner hole positioning tube 52 through the lower port of the inner hole positioning tube 52, and finally flows out from the upper port of the inner hole positioning tube 52 into the inner cavity of the fuel injector seat 60.
[0053] Preferably, as another optional scheme, each inner hole positioning tube 52 can also directly pass through the bottom plate 10, and at the same time, the lower end of each inner hole positioning tube 52 is respectively connected to an air intake connector, and the air intake connector is connected to an external high-pressure air pipe, and the external high-pressure air pipe is connected to an external high-pressure air source, thereby realizing the connection between the inner hole positioning tube 52 and the external high-pressure air source.
[0054] In this embodiment, a mounting groove is provided on the base plate 10 ; the lower portion of the injector seat support block 50 is placed in the mounting groove and fixedly connected to the base plate 10 ; at the same time, the upper portion of the injector seat support block 50 protrudes from the upper end of the base plate 10 .
[0055] During operation, the injector seat 60 can be placed between the baffle 20 and the plug assembly, and the upper part of the inner hole positioning tube 52 is inserted into the through hole 61 on the side wall of the injector seat. The clamping rod 30 presses the injector seat 60 downward, and the outer orifice of the through hole 61 on the side wall of the injector seat 60 is tightly blocked by the outer hole sealing block 53. At the same time, the plug assembly pushes from the side toward the port 62 at the end of the injector seat to block the port 62 of the injector seat. Finally, the entire detection fixture is placed in water, and the high-pressure gas is introduced into the inner cavity of the injector seat 60 through the inner hole positioning tube 52 to simulate the high-pressure state in the inner cavity of the injector seat 60. We can observe the bubbles in the water to see whether bubbles emerge on the outer wall of the injector seat 60 under the high-pressure state. If bubbles emerge on the outer wall of the injector seat 60, it means that the injector seat has a risk of leakage and is an unqualified leakage defective part. The above operation can detect the injector seat that has leakage risk.
Claims
1. A water tightness detection fixture for a fuel injector seat, characterized in that: It includes a bottom plate, and the upper end of the bottom plate is provided with baffles and plug assemblies distributed on the left and right; a plurality of inner hole positioning through pipes extending longitudinally are provided between the baffles and the plug assemblies on the bottom plate, and an outer hole sealing block is provided at the upper end of the radial bottom plate of the outer wall of the inner hole positioning through pipe; the upper and lower ends of the inner hole positioning through pipe are connected, so that high-pressure gas can pass through; The plug assembly includes a guide plate and a plurality of sealing plugs; the sealing plug is connected to one end of the guide plate that positions the through pipe toward the inner hole; a plane sealing ring is also provided on one end of the sealing plug that positions the through pipe toward the inner hole; It also includes a limiting guide block and a tightening screw for pushing the plug assembly toward the baffle; the limiting guide block is fixedly connected to the upper end of the bottom plate, and the tightening screw is threadedly connected to the limiting guide block; It also includes a clamping rod and a locking component; the locking component includes a locking pressure head and a locking screw connected to the lower end of the locking pressure head; one end of the clamping rod is provided with a plug hole that passes through from top to bottom; The other end of the pressing rod is hinged to the bottom plate or to a connecting rod connected to the upper end of the bottom plate; The locking screw is threadedly connected with the bottom plate after passing through the insertion hole, or is threadedly connected with two connecting rods connected to the upper end of the bottom plate after passing through the insertion hole.
2. The water tightness detection fixture for a fuel injector seat according to claim 1, characterized in that: An inner hole sealing ring is also arranged radially on the outer wall of the inner hole positioning through pipe. The inner hole sealing ring and the outer hole sealing block are distributed up and down, and the outer diameter of the inner hole sealing ring is smaller than the outer diameter of the outer hole sealing block.
3. The water tightness detection fixture for the fuel injector seat according to claim 2, characterized in that: It also includes a guide plate limiting pin, one end of which is fixedly connected to the guide plate, and the other end is inserted into a limiting hole arranged on the limiting guide block.
4. The water tightness detection fixture for the fuel injector seat according to claim 3 is characterized in that: Two guide slots are arranged on the limiting guide block, and the symmetrical two ends of the guide plate are respectively placed in one guide slot.
5. The water tightness detection fixture for the fuel injector seat according to claim 4, characterized in that: A positioning protrusion end is also arranged in the middle of the plane sealing ring.
6. A water tightness detection fixture for a fuel injector seat according to any one of claims 1 to 5, characterized in that: The base plate is also connected to an injector seat support block, which is located at the lower end of the outer hole sealing block; a ventilation cavity is provided inside the injector seat support block, and the lower end of the inner hole positioning through pipe is connected to the ventilation cavity; the ventilation cavity is provided with an air inlet, which is located on the side wall of the injector seat support block; an air inlet connector is connected to the air inlet.
7. The water tightness detection fixture for a fuel injector seat according to claim 6, characterized in that: A plurality of clamping rod notches are arranged at the left end or the right end of the clamping rod; when the clamping rod is pressed down, the clamping rod notches are located above the space between two adjacent inner hole positioning through pipes.
8. The water tightness detection fixture for a fuel injector seat according to claim 7, characterized in that: The upper end surface of the outer hole sealing block is an arc concave surface.