Packaging structure for oil rail high-pressure sensor

Abstract

The invention relates to the technical field of high-pressure sensors, in particular to a packaging structure for an oil rail high-pressure sensor, which comprises a metal hexagonal shell and a plastic joint, a pressure sensing element is arranged in the metal hexagonal shell, a metal gasket and a PCBA (Printed Circuit Board Assembly) are arranged in the metal hexagonal shell, a plurality of through holes are formed in the surface of the PCBA, springs are arranged in the through holes, and the plastic joint is arranged in the metal hexagonal shell. A sealing ring is arranged in a gap between the metal gasket and the metal hexagonal shell, a plurality of PINs are connected into the plastic connector in an injection molding mode, a plurality of springs are electrically connected with the corresponding PINs respectively, and an anti-falling assembly is arranged in the plastic connector. Through the matching structural design of the plastic joint, the spring and the PCBA, the structure is more compact, the reliability is better, the welding process is mostly adopted, the structure is compact, the strength reliability is higher, more automatic equipment can be used in the process, and the process control is simpler, more stable and more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure sensors, and in particular to a packaging structure for a fuel rail high-pressure sensor. Background Art

[0002] The automotive fuel supply pressure sensor is a key sensor in modern electronic fuel injection systems. It mainly monitors the fuel pressure in the fuel distribution pipe (fuel rail) in real time and converts this pressure signal into an electrical signal and sends it to the engine control unit.

[0003] In existing technologies, the sensor's exterior is also secured by PIN connectors. However, the internal fixing structure design greatly limits the application's flexibility in sensor boundary dimensions. Furthermore, the plastic connector of the automotive fuel supply pressure sensor suffers from the following defects under continuous engine vibration and temperature cycling conditions: 1. The traditional plastic connector adopts a single barb buckle structure, which is prone to plastic deformation under long-term alternating stress, resulting in attenuation of the locking force and radial micro-displacement between the connector and the sensor body; 2. The PIN pin inside the connector moves axially due to loose joints, causing micro-friction between the metal contacts of the PIN pin, resulting in plating peeling and abnormal increase in contact resistance; The above defects will cause the connector contact resistance to fluctuate, thereby causing the sensor signal voltage to drift and causing the ECU to receive incorrect fuel pressure values.

[0004] Based on this, a packaging structure for a fuel rail high-pressure sensor is proposed. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention proposes a packaging structure for a fuel rail high-pressure sensor.

[0006] The technical solution for achieving the objectives of the present invention is: a packaging structure for a fuel rail high-pressure sensor, comprising a metal hexagonal shell and a plastic joint, wherein the plastic joint and the metal hexagonal shell are fixedly connected by riveting, a pressure-sensitive element is provided inside the metal hexagonal shell, and the metal hexagonal shell is fixedly connected to the pressure-sensitive element by laser welding, a metal washer and a PCBA are provided inside the metal hexagonal shell, the metal washer and the PCBA are fixed by reflow soldering SMT, the metal hexagonal shell is fixedly connected to the stepped surface at the bottom by three-point electric welding, a plurality of through holes are provided on the surface of the PCBA, a spring is provided inside each of the plurality of through holes, a sealing ring is provided between the gap between the metal washer and the metal hexagonal shell, the sealing ring is fixedly connected to the plastic joint by riveting, a plurality of PIN pins are injection-molded inside the plastic joint, a plurality of the springs are electrically connected to the corresponding plurality of the PIN pins, and an anti-fall-off component is provided inside the plastic joint.

[0007] Preferably, the anti-falling component includes two positioning grooves provided on the inner wall of the plastic joint, the inner walls of the two positioning grooves are slidably connected with positioning blocks, the opposite surfaces of the two positioning blocks are fixedly connected with the same plug, slots are provided on both sides of the plug, extrusion blocks are fixedly connected on both sides of the plug, the surface of the plastic joint is fixedly connected with a limiting buckle, and the surface of the plug is fixedly connected with a connecting buckle.

[0008] Preferably, mounting grooves are provided on the inner walls on both sides of the plastic joint, the inner bottom walls of the two mounting grooves are fixedly connected to cylinders, the inner walls of the two cylinders are slidably connected to piston rods, the top ends of the two piston rods are fixedly connected to movable seats, the surfaces of the two movable seats are respectively slidably connected to the inner walls of the mounting grooves, the inner bottom walls of the two cylinders are fixedly connected to tension springs, and the top ends of the two tension springs are respectively fixedly connected to the bottom ends of the corresponding two piston rods.

[0009] Preferably, the inner wall of the mounting groove is fixedly connected with a U-shaped plate, the inner wall of the U-shaped plate is rotatably connected with two rotating shafts, the surfaces of the two rotating shafts are fixedly connected with an air outlet head and gear 1, the surface of the air outlet head is fixedly connected with a hose, and the end of the hose away from the air outlet head is fixedly connected with a connecting pipe.

[0010] Preferably, the inner wall of the connecting tube is rotatably connected to a valve core, the surface of the connecting tube is rotatably connected to a rotating rod, one end of the rotating rod is fixedly connected to gear 2, and the end of the rotating rod away from gear 2 passes through the inner wall of the connecting tube and is fixedly connected to the surface of the valve core.

[0011] Preferably, two racks 1 are fixedly connected to the lower surface of the movable seat, and the lower surfaces of the two racks 1 are fixedly connected to rack 2, the rack 1 is meshed with the gear 1, and the rack 2 is meshed with the gear 2.

[0012] Preferably, a rectangular groove is provided on the upper surface of the movable seat, a compression spring rod is fixedly connected to the inner wall of the rectangular groove, a buckle is slidably connected to the inner wall of the rectangular groove, a sliding hole is provided on one side of the buckle, and the inner wall of the sliding hole is slidably connected to the surface of the compression spring rod.

[0013] Preferably, a limiting groove is provided on the upper surface of the movable seat, and one side of the movable seat is rotatably connected to a rotating seat via a coil spring shaft, and a clamping block and a hook are fixedly connected to the surface of the rotating seat respectively, and the hook is adapted to the inner wall of the limiting groove, and a stop block is fixedly connected to the inner wall of the mounting groove.

[0014] Compared with the prior art, the present invention has the following significant advantages: First, the present invention achieves a more compact structure and better reliability by designing the matching structure of the plastic connector, spring and PCBA, thereby achieving a certain degree of product lightweighting and lower cost. At the same time, the metal hexagonal shell can be fixedly connected to the pressure-sensitive element through a laser welding process, the metal gasket is fixed to the PCBA through reflow soldering SMT, and then fixed through three-point electric welding between the bottom outer ring and the stepped surface of the metal hexagonal shell. The spring is installed in the through hole of the PCBA, and a sealing ring is placed between the metal gasket and the metal hexagonal shell. The spring is then fixed to the connector by riveting. The spring can directly contact the PIN needle injection-molded with the connector. In the entire structural design, the metal parts are mostly fixed by welding, which has a compact structure and strong strength and reliability. In the process, more automated equipment can be used, making process control simpler, more stable and reliable.

[0015] Second, when the plug is inserted into the plastic connector to the limit position, the card slot on the plug corresponds to the buckle on the movable seat. At this time, the stopper on the installation slot blocks the card block, thereby causing the rotating seat to rotate. When the rotating seat rotates, the card hook can rotate synchronously. At this time, the card hook is disengaged from the limit slot, and the buckle can slide on the movable seat under the action of the compression spring rod, so that the buckle is stuck in the card slot, thereby further fixing the plug and preventing the plug from loosening. Thirdly, when the two racks 1 are disengaged from the two gears 1, the two racks 2 can be meshed with the two gears 2, thereby driving the rotation of the two gears 2. When the plug is inserted into the plastic joint to the limit position, the gear 2 drives the valve core to rotate 90 degrees, blocking the connecting pipe, thereby limiting the position of the piston rod. The limiting position of the piston rod can improve the stability of the movable base, thereby improving the stability of the buckle on the movable base when inserted into the card slot, and preventing the plug from shaking inside the plastic joint, thereby causing wear on the surface of the PIN needle. Fourthly, when the plug of the present invention is inserted into the plastic joint, the two extrusion blocks on the plug will squeeze the two movable seats at the same time, causing the two movable seats to slide downward inside the mounting groove. In the process of sliding downward, the two piston rods can be squeezed. In the process of the two piston rods descending, the air inside the cylinder can be squeezed out through the connecting tube, and then sprayed out through the air outlet head. The sprayed air can clean the surface of the PIN pin set inside the plastic joint, avoiding dust adhering to the surface of the PIN pin, causing poor contact during the insertion of the plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the three-dimensional structure provided by the present invention; Figure 2 It is a schematic diagram of the cross-section structure provided by the present invention; Figure 3 It is a schematic diagram of the internal structure of the sensor provided by the present invention; Figure 4 This is a schematic diagram of the internal explosion structure of the sensor provided by the present invention; Figure 5 This is a schematic diagram of the plastic joint connection structure provided by the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the plastic joint provided by the present invention; Figure 7 The present invention provides Figure 6 A in the middle is an enlarged structural diagram; Figure 8 It is a schematic diagram of the buckle structure provided by the present invention; Figure 9 This is a schematic diagram of the block structure provided by the present invention; Figure 10 The present invention provides Figure 9 Enlarged structural diagram at point B in the middle.

[0017] Description of reference numerals: 1. Metal hexagonal shell; 2. Pressure-sensitive element; 3. Plastic connector; 4. Limit buckle; 5. Metal gasket; 6. Sealing ring; 7. PIN pin; 8. PCBA; 9. Spring; 10. Positioning slot; 11. Plug; 12. Connecting buckle; 13. Positioning block; 14. Extrusion block; 15. Slot; 16. Mounting slot; 17. Moving seat; 18. Buckle; 19. Piston rod; 20. Cylinder; 21. Tension spring; 22. U-shaped plate; 23. Air outlet; 24. Gear 1; 25. Connecting pipe; 26. Hose; 27. Valve core; 28. Gear 2; 29. ​​Rectangular slot; 30. Compression spring rod; 31. Rotating seat; 32. Block; 33. Limiting slot; 34. Hook; 35. Stopper; 36. Rack 1; 37. Rack 2. DETAILED DESCRIPTION

[0018] The present invention is described in detail below, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] The present invention provides a packaging structure for a fuel rail high-pressure sensor through improvement. The technical solution of the present invention is: Example 1 like Figures 1-4As shown, a packaging structure for a fuel rail high-pressure sensor includes a metal hexagonal shell 1 and a plastic connector 3. The plastic connector 3 and the metal hexagonal shell 1 are fixedly connected by riveting. A pressure-sensitive element 2 is provided inside the metal hexagonal shell 1. The metal hexagonal shell 1 is fixedly connected to the pressure-sensitive element 2 by laser welding. A metal washer 5 and a PCBA 8 are provided inside the metal hexagonal shell 1. The metal washer 5 and the PCBA 8 are fixed by reflow soldering SMT. The metal hexagonal shell 1 is fixedly connected to the stepped surface at the bottom by three-point electric welding. A plurality of through holes are provided on the surface of the PCBA 8. Springs 9 are provided inside the plurality of through holes. A sealing ring 6 is provided between the gap between the metal washer 5 and the metal hexagonal shell 1. The sealing ring 6 and the plastic connector 3 are fixedly connected by riveting. A plurality of PIN pins 7 are injection-molded inside the plastic connector 3. A plurality of springs 9 are electrically connected to the corresponding plurality of PIN pins 7. An anti-fall-off component is provided inside the plastic connector 3.

[0020] The metal hexagonal housing 1 is fixedly connected to the pressure-sensing element 2 via laser welding. The metal washer 5 is fixed to the PCBA 8 via reflow soldering (SMT). It is then secured by three-point electric welding between the bottom outer ring and the stepped surface of the metal hexagonal housing 1. The spring 9 is inserted into the through-hole of the PCBA 8. A sealing ring 6 is placed between the metal washer 5 and the metal hexagonal housing 1, and then secured to the connector via riveting. The spring 9 directly contacts the PIN 7, which is injection-molded into the connector. Throughout the structural design, welding is primarily used to secure the metal components, resulting in a compact structure with strong strength and reliability. This allows for the use of more automated equipment, making process control simpler, more stable, and more reliable.

[0021] The design of the pressure-sensing element 2 includes a stainless steel housing, glass adhesive, and a strain gauge. The strain gauge is bonded to the stainless steel surface using glass adhesive as a carrier. The entire sensor's signal transmission pathway is as follows: The electrical signal is transmitted via wire binding to PCBA 8, which features printed metal circuitry and through-holes. The signal conditioning chip, resistors, and capacitors are attached to the metal circuitry and pads. The PCBA 8 then transmits the signal from the pressure-sensing element 2 through the surface through-holes and spring 9 to PIN pin 7, which then transmits it to the external port.

[0022] Example 2 Based on the first embodiment, Figure 5As shown, the anti-falling component includes two positioning grooves 10 provided on the inner wall of the plastic joint 3, and the inner walls of the two positioning grooves 10 are slidably connected with positioning blocks 13. Through the setting of the positioning grooves 10 and the positioning blocks 13, the plug 11 and the plastic joint 3 can be quickly and accurately connected. The opposite surfaces of the two positioning blocks 13 are fixedly connected with the same plug 11, and card slots 15 are provided on both sides of the plug 11. Both sides of the plug 11 are fixedly connected with extrusion blocks 14, and the extrusion blocks 14 are U-shaped, which can avoid the sliding of the buckle 18. The surface of the plastic joint 3 is fixedly connected with the limiting buckle 4, and the surface of the plug 11 is fixedly connected with the connecting buckle 12.

[0023] The inner walls on both sides of the plastic joint 3 are provided with mounting grooves 16, and the inner bottom walls of the two mounting grooves 16 are fixedly connected with cylinders 20. The inner walls of the two cylinders 20 are slidably connected with piston rods 19. Through the cooperation of the cylinder 20 and the piston rod 19, the air outlet of the connecting pipe 25 and the air outlet head 23 can be realized, thereby cleaning the PIN needle 7. The top ends of the two piston rods 19 are fixedly connected with movable seats 17, and the surfaces of the two movable seats 17 are respectively slidably connected to the inner walls of the mounting grooves 16. The inner bottom walls of the two cylinders 20 are fixedly connected with tension springs 21, and the top ends of the two tension springs 21 are respectively fixedly connected to the bottom ends of the corresponding two piston rods 19.

[0024] like Figure 6 and Figure 7 As shown, the inner wall of the mounting groove 16 is fixedly connected with a U-shaped plate 22, and the inner wall of the U-shaped plate 22 is rotatably connected to two rotating shafts. The surfaces of the two rotating shafts are fixedly connected with an air outlet head 23 and a gear 24. The surface of the air outlet head 23 is fixedly connected with a hose 26, and the end of the hose 26 away from the air outlet head 23 is fixedly connected with a connecting pipe 25. The set hose 26 can provide motion compensation for the air outlet head 23 when it rotates to avoid motion interference.

[0025] The inner wall of the connecting tube 25 is rotatably connected to a valve core 27, and the surface of the connecting tube 25 is rotatably connected to a rotating rod, one end of the rotating rod is fixedly connected to a gear 28, and the end of the rotating rod away from the gear 28 passes through the inner wall of the connecting tube 25 and is fixedly connected to the surface of the valve core 27. By setting the valve core 27 and the gear 2 28 in conjunction with the rack 2 37, the gear 2 28 can drive the valve core 27 to rotate ninety degrees, thereby blocking the connecting tube 25 and limiting the piston rod 19. The limitation of the piston rod 19 can improve the stability of the movable seat 17, thereby improving the stability of the buckle 18 on the movable seat 17 inserted into the card slot 15, and preventing the plug 11 from shaking inside the plastic connector 3, thereby causing wear on the surface of the PIN needle 7.

[0026] like Figure 5 and Figure 6As shown, two racks 1 36 are fixedly connected to the lower surface of the movable seat 17 , and racks 2 37 are fixedly connected to the lower surfaces of the two racks 1 36 . Racks 1 36 are meshed with gear 1 24 , and racks 2 37 are meshed with gear 2 28 .

[0027] A rectangular groove 29 is provided on the upper surface of the movable seat 17, and a compression spring rod 30 is fixedly connected to the inner wall of the rectangular groove 29. A buckle 18 is slidably connected to the inner wall of the rectangular groove 29. A sliding hole is provided on one side of the buckle 18, and the inner wall of the sliding hole is slidably connected to the surface of the compression spring rod 30.

[0028] A limiting groove 33 is provided on the upper surface of the movable seat 17. One side of the movable seat 17 is rotatably connected to the rotating seat 31 through a coil spring shaft. The surface of the rotating seat 31 is fixedly connected with a clamping block 32 and a hook 34. The hook 34 is adapted to the inner wall of the limiting groove 33. The inner wall of the mounting groove 16 is fixedly connected with a stop block 35.

[0029] The specific working method is: when in use, the plug 11 is inserted into the interior of the plastic connector 3. During the insertion process, the positioning block 13 on the plug 11 and the positioning groove 10 of the plastic connector 3 can calibrate the plug 11, and the connecting buckle 12 on the plug 11 can cooperate with the limiting buckle 4 on the plastic connector 3 to preliminarily fix the plug 11 and the plastic connector 3. At the same time, during the insertion process, the two squeezing blocks 14 on the plug 11 will squeeze the two moving seats 17 at the same time, causing the two moving seats 17 to slide downward inside the mounting groove 16. During the downward sliding process, the two piston rods 19 can be squeezed. During the descending process of the two piston rods 19, the air inside the cylinder 20 can be squeezed out through the connecting pipe 25, and then sprayed out through the air outlet head 23. The sprayed air can clean the surface of the PIN needle 7 provided inside the plastic connector 3 to prevent dust from adhering to the surface of the PIN needle 7 and causing poor contact during the insertion of the plug 11. As the plug 11 continues to be inserted, the two racks 36 will first mesh with the two gears 24, thereby driving the two gears 24 to rotate. The rotation of the two gears 24 can drive the two outlet bags to swing, thereby increasing the cleaning range of the PIN needle 7 and improving the cleaning effect; the plug 11 continues to move, and when the two racks 36 are disengaged from the two gears 24, the two racks 237 can be meshed with the two gears 28, thereby driving the rotation of the two gears 28. When the plug 11 is inserted into the plastic joint 3 to the limit position, the gear 2 28 drives the valve core 27 to rotate ninety degrees, blocking the connecting pipe 25, thereby limiting the piston rod 19. The limitation of the piston rod 19 can improve the stability of the movable seat 17, thereby improving the stability of the buckle 18 on the movable seat 17 inserted into the card slot 15, and preventing the plug 11 from shaking inside the plastic joint 3, thereby causing wear on the surface of the PIN needle 7; When the plug 11 is inserted into the plastic connector 3 to the limit position, the slot 15 on the plug 11 corresponds to the buckle 18 on the movable seat 17. At this time, the stopper 35 on the mounting slot 16 blocks the block 32, thereby causing the rotating seat 31 to rotate. When the rotating seat 31 rotates, the hook 34 can rotate synchronously. At this time, the hook 34 is disengaged from the limit slot 33, and the buckle 18 can slide on the movable seat 17 under the action of the compression spring rod 30, so that the buckle 18 is stuck in the slot 15, thereby further fixing the plug 11 and preventing the plug 11 from loosening.

[0030] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical solutions composed of equivalent replacements of the above technical features. Matters not covered in the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A packaging structure for a fuel rail high-pressure sensor, comprising a metal hexagonal shell (1) and a plastic joint (3), wherein the plastic joint (3) and the metal hexagonal shell (1) are fixedly connected by riveting, and characterized in that: A pressure-sensitive element (2) is provided inside the metal hexagonal shell (1), and the metal hexagonal shell (1) is fixedly connected to the pressure-sensitive element (2) by laser welding. A metal washer (5) and a PCBA (8) are provided inside the metal hexagonal shell (1), and the metal washer (5) and the PCBA (8) are fixed by reflow soldering SMT. The metal hexagonal shell (1) is fixedly connected to the stepped surface of the bottom by three-point electric welding. A plurality of through holes are provided on the surface of the PCBA (8), and a spring (9) is provided inside each of the plurality of through holes. A sealing ring (6) is provided between the gap between the metal washer (5) and the metal hexagonal shell (1), and the sealing ring (6) is fixedly connected to the plastic joint (3) by riveting. A plurality of PIN pins (7) are injection-molded inside the plastic joint (3), and a plurality of the springs (9) are electrically connected to the corresponding plurality of the PIN pins (7). An anti-drop component is provided inside the plastic joint (3).

2. The packaging structure for a fuel rail high pressure sensor according to claim 1, characterized in that: The anti-fall-off assembly comprises two positioning grooves (10) provided on the inner wall of the plastic joint (3), the inner walls of the two positioning grooves (10) are slidably connected to positioning blocks (13), the opposite surfaces of the two positioning blocks (13) are fixedly connected to the same plug (11), both sides of the plug (11) are provided with card slots (15), both sides of the plug (11) are fixedly connected to extrusion blocks (14), the surface of the plastic joint (3) is fixedly connected to a limiting buckle (4), and the surface of the plug (11) is fixedly connected to a connecting buckle (12).

3. The packaging structure for a fuel rail high pressure sensor according to claim 2, characterized in that: The inner walls on both sides of the plastic joint (3) are provided with mounting grooves (16), the inner bottom walls of the two mounting grooves (16) are fixedly connected to cylinders (20), the inner walls of the two cylinders (20) are slidably connected to piston rods (19), the top ends of the two piston rods (19) are fixedly connected to movable seats (17), the surfaces of the two movable seats (17) are respectively slidably connected to the inner walls of the mounting grooves (16), the inner bottom walls of the two cylinders (20) are fixedly connected to tension springs (21), and the top ends of the two tension springs (21) are respectively fixedly connected to the bottom ends of the corresponding two piston rods (19).

4. The packaging structure for a fuel rail high pressure sensor according to claim 3, characterized in that: The inner wall of the mounting groove (16) is fixedly connected to a U-shaped plate (22), and the inner wall of the U-shaped plate (22) is rotatably connected to two rotating shafts. The surfaces of the two rotating shafts are fixedly connected to an air outlet head (23) and a gear 1 (24). The surface of the air outlet head (23) is fixedly connected to a hose (26), and one end of the hose (26) away from the air outlet head (23) is fixedly connected to a connecting pipe (25).

5. The packaging structure for a fuel rail high pressure sensor according to claim 4, characterized in that: The inner wall of the connecting tube (25) is rotatably connected to a valve core (27), the surface of the connecting tube (25) is rotatably connected to a rotating rod, one end of the rotating rod is fixedly connected to a second gear (28), and the end of the rotating rod away from the second gear (28) passes through the inner wall of the connecting tube (25) and is fixedly connected to the surface of the valve core (27).

6. The packaging structure for a fuel rail high pressure sensor according to claim 3, characterized in that: The lower surface of the movable seat (17) is fixedly connected to two racks 1 (36), and the lower surfaces of the two racks 1 (36) are fixedly connected to racks 2 (37). The racks 1 (36) are meshed with gear 1 (24), and the racks 2 (37) are meshed with gear 2 (28).

7. The packaging structure for a fuel rail high pressure sensor according to claim 6, characterized in that: A rectangular groove (29) is provided on the upper surface of the movable seat (17), a compression spring rod (30) is fixedly connected to the inner wall of the rectangular groove (29), a buckle (18) is slidably connected to the inner wall of the rectangular groove (29), a sliding hole is provided on one side of the buckle (18), and the inner wall of the sliding hole is slidably connected to the surface of the compression spring rod (30).

8. The packaging structure for a fuel rail high pressure sensor according to claim 7, characterized in that: A limiting groove (33) is provided on the upper surface of the movable seat (17), and one side of the movable seat (17) is rotatably connected to a rotating seat (31) via a coil spring shaft. A clamping block (32) and a hook (34) are fixedly connected to the surface of the rotating seat (31), and the hook (34) is adapted to the inner wall of the limiting groove (33). A stopper (35) is fixedly connected to the inner wall of the mounting groove (16).

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