High-pressure common-rail fuel injector

Abstract

The utility model relates to a high-pressure common-rail fuel injector, which belongs to the technical field of fuel injection pumps and comprises a fuel injector body, a reset spring is fixed in the fuel injector body, an upper baffle is fixed at the bottom of the reset spring, a connecting rod in sliding connection with the fuel injector body is fixed at the bottom of the upper baffle, and a lower baffle is fixed on the outer surface of the connecting rod. A sealing assembly is arranged at the bottom of the upper baffle and used for improving the sealing performance between the connecting rod and the oil sprayer body. According to the high-pressure common-rail oil injector, under the pushing of elastic potential energy of a reset spring, an upper baffle and a lower baffle can be attached to the oil injector body, the upper baffle can push a sealing assembly to move, a sealing gasket in the sealing assembly is opened in the horizontal direction, and then diesel oil flowing in the vertical direction is not prone to passing through a connecting rod; and therefore, the overall sealing performance can be effectively improved, leakage of high-pressure diesel oil is not prone to being caused, and the overall practicability is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injection pumps, in particular to a high-pressure common rail fuel injector. Background Art

[0002] In the technological development of diesel engines, attention has always been paid to the improvement and optimization of their combustion process, which requires the fuel injection system to have superior performance. The application of high-pressure common rail electronic fuel injection technology has played a huge role in the development of diesel engine technology. It further reduces fuel consumption and enhances power performance while meeting more stringent emission regulations, and enables the system to have higher injection pressure and more flexible injection methods.

[0003] For example, the Chinese utility model patent with the announcement number CN212898755U discloses an improved electronically controlled high-pressure common rail injector, including a high-speed electromagnet, an armature return spring adjustment pad is provided inside the high-speed electromagnet, an armature return spring is provided below the armature return spring adjustment pad, an armature sheath is provided below the armature return spring, an electromagnet clamping cap is provided on both sides of the front end below the high-speed electromagnet, and an electromagnet-shaped ring is provided at the lower end of each of the electromagnet clamping caps; the utility model has the advantages of changing the low-pressure oil passage of the traditional electronically controlled high-pressure common rail injector, reducing the aspect ratio of the deep hole and the slender hole, shortening the length of the low-pressure oil passage, solving the problems of the drill being not durable and breaking due to the excessive aspect ratio of the slender hole, the small diameter of the oil passage hole and the long oil passage, the excessive aspect ratio of the hole, the high precision of the required processing equipment, and the equipment consumables are expensive, resulting in high processing costs, and reducing the dependence on high-precision equipment.

[0004] However, there are still some problems. Although the dependence on high-precision equipment is reduced, the sealing steel ball falls on the conical surface of the control valve sleeve to block the oil outlet and prevent the flow of diesel. However, it is only supported by the preload force of the return spring, and there is a problem of poor sealing. Due to the certain hydraulic pressure of diesel, it will cause a certain amount of diesel leakage. Therefore, a high-pressure common rail injector is proposed to solve the above problems. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a high-pressure common rail injector having the advantage of high sealing performance and solving the problem of poor sealing performance caused by supporting only by the preload force of a return spring.

[0006] To achieve the above object, the utility model provides the following technical solution: a high-pressure common rail injector, comprising an injector body, a return spring is fixed inside the injector body, an upper baffle is fixed at the bottom of the return spring, a connecting rod slidably connected to the injector body is fixed at the bottom of the upper baffle, a lower baffle is fixed on the outer surface of the connecting rod, a sealing assembly is arranged at the bottom of the upper baffle, and the sealing assembly is used to improve the sealing between the connecting rod and the injector body;

[0007] A coil is fixed inside the injector body, a wiring terminal penetrating to the outside of the injector body is fixed on the top of the coil, a return port is fixed on the top of the injector body, an oil inlet is fixed on the right side of the injector body, a closing assembly is arranged inside the injector body, and a nozzle is threadedly connected to the outer surface of the injector body;

[0008] The sealing assembly includes two pushing blocks, two moving blocks, two extrusion blocks and a sealing gasket, wherein the pushing blocks are fixed to the upper baffle, the moving blocks are slidably connected to the injector body, the opposite sides of the two moving blocks are fixed to the extrusion blocks, and the sealing gasket is fixed to the injector body.

[0009] By adopting this technical solution, when the upper baffle pushes the push block to move downward, the inclined surface of the push block will squeeze the moving block, so that the moving block can slide horizontally inside the injector body, which can effectively expand the sealing gasket and improve the overall sealing performance.

[0010] Furthermore, a sealing ring is fixed to the bottom of the upper baffle, and a sealing groove matched with the sealing ring is provided inside the injector body.

[0011] By adopting this technical solution and providing a sealing ring, the sealing performance of the connection between the upper baffle and the injector body can be further improved.

[0012] Furthermore, the closing assembly includes a connecting rod, a sealing rod and a supporting spring, the connecting rod is slidably connected to the injector body, the bottom of the connecting rod is fixed to the sealing rod slidably connected to the injector body, and the sealing rod and the injector body are fixed with the supporting spring.

[0013] By adopting this technical solution, under the prestress of the support spring, the sealing rod will move downward to seal the bottom of the injector body, thereby effectively preventing diesel leakage.

[0014] Furthermore, sliding blocks are fixed on both upper and lower sides of the moving block, and a sliding groove slidably connected to the sliding block is provided inside the injector body.

[0015] By adopting this technical solution, the movement of the moving block can be made more stable by arranging the sliding block and the sliding groove.

[0016] Furthermore, the two pushing blocks are provided with inclined surfaces on opposite sides, the squeezing block is a semi-arc plate, and the sealing ring is an annular ring.

[0017] By adopting this technical solution, the inclined surface is arranged so that when the pushing block moves downward, the moving block can be squeezed, thereby causing the moving block to move in the horizontal direction.

[0018] Furthermore, a return channel communicating with the oil inlet is provided inside the fuel injector body, and a high-pressure flow channel communicating with the return channel is provided inside the fuel injector body.

[0019] By adopting this technical solution, the return flow channel and the high-pressure flow channel are provided, so that the diesel can flow to the upper and lower sides of the sealing rod, thereby making the pressure on the upper and lower sides of the sealing rod the same.

[0020] Furthermore, the oil inlet, the return channel, the high-pressure flow channel, the return port and the nozzle are interconnected.

[0021] Furthermore, the upper baffle is an armature baffle, and a spray hole is provided inside the nozzle.

[0022] By adopting this technical solution, the armature baffle is set so that the generated magnetic field can pull the armature baffle to move.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0024] 1. The high-pressure common rail injector, under the push of the elastic potential energy of the return spring, will make the upper baffle and the lower baffle fit with the injector body, and the upper baffle will push the sealing assembly to move, and the sealing gasket inside the sealing assembly will be stretched out from the horizontal direction, so that the diesel flowing in the vertical direction will not easily pass through the connecting rod, thereby effectively improving the overall sealing performance, not easily causing leakage of high-pressure diesel, and effectively improving the overall practicality.

[0025] 2. The high-pressure common rail injector can seal the injector body in two layers by means of the upper baffle and the lower baffle, and cooperate with the sealing ring to further improve the sealing inside the injector body. The nozzle is threadedly connected to the injector body, so that the nozzle is easy to disassemble and maintain later. The overall structure is simple, which further improves the overall practicality and makes the overall structure more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the sealing component structure of the utility model;

[0028] Figure 3 It is a three-dimensional diagram of the connection structure between the moving block and the extrusion block of the utility model.

[0029] In the figure: 1. injector body; 2. return spring; 3. upper baffle; 4. connecting rod; 5. lower baffle; 6. sealing assembly; 601. push block; 602. moving block; 603. extrusion block; 604. sealing gasket; 7. coil; 8. terminal; 9. return port; 10. oil inlet; 11. high-pressure flow channel; 12. return channel; 13. connecting rod; 14. sealing rod; 15. supporting spring; 16. nozzle; 17. spray hole; 18. sealing ring; 19. sliding block. DETAILED DESCRIPTION

[0030] 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 in 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.

[0031] See also Figure 1 In the present embodiment, a high-pressure common rail injector comprises an injector body 1, a return spring 2 is fixed inside the injector body 1, an upper baffle 3 is fixed at the bottom of the return spring 2, the upper baffle 3 is an armature baffle, and is arranged as an armature baffle so that the generated magnetic field can pull the armature baffle to move, a sealing ring 18 is fixed at the bottom of the upper baffle 3, a sealing groove adapted to the sealing ring 18 is provided inside the injector body 1, and the sealing ring 18 can further improve the sealing performance of the connection between the upper baffle 3 and the injector body 1, a connecting rod 4 slidably connected to the injector body 1 is fixed at the bottom of the upper baffle 3, a lower baffle 5 is fixed to the outer surface of the connecting rod 4, and a sealing assembly 6 is arranged at the bottom of the upper baffle 3, and the sealing assembly 6 is used to improve the sealing performance between the connecting rod 4 and the injector body 1.

[0032] In addition, a coil 7 is fixed inside the injector body 1, a terminal 8 is fixed on the top of the coil 7 and extends to the outside of the injector body 1, a return port 9 is fixed on the top of the injector body 1, a fuel inlet 10 is fixed on the right side of the injector body 1, a return channel 12 connected to the fuel inlet 10 is opened inside the injector body 1, and a high-pressure flow channel 11 connected to the return channel 12 is opened inside the injector body 1. The return channel 12 and the high-pressure flow channel 11 allow the diesel to flow to the upper and lower sides of the sealing rod 14, so that the pressures on the upper and lower sides of the sealing rod 14 are the same.

[0033] Furthermore, a closing assembly is provided inside the injector body 1, and the closing assembly includes a connecting rod 13, a sealing rod 14 and a supporting spring 15. The connecting rod 13 is slidably connected to the injector body 1, and the bottom of the connecting rod 13 is fixed to the sealing rod 14 slidably connected to the injector body 1. The sealing rod 14 and the injector body 1 are fixed with the supporting spring 15. Under the prestress of the supporting spring 15, the sealing rod 14 will move downward to seal the bottom of the injector body 1, thereby effectively preventing diesel leakage. The outer surface of the injector body 1 is threadedly connected to a nozzle 16, and a spray hole 17 is opened inside the nozzle 16.

[0034] It should be noted that the oil inlet 10, the return channel 12, the high-pressure flow channel 11, the return port 9 and the nozzle 16 are interconnected.

[0035] In general, the coil 7 can generate a magnetic field, so that the upper baffle 3 can move upward, so that the return port 9 is connected to the injector body 1, and the upper and lower sides of the sealing rod 14 have different hydraulic pressures, so that the sealing rod 14 can move upward.

[0036] See also Figure 2-3 The sealing assembly 6 in this embodiment includes two pushing blocks 601, two moving blocks 602, two squeezing blocks 603 and a sealing gasket 604. The pushing block 601 is fixed to the upper baffle 3, the moving block 602 is slidably connected to the injector body 1, and sliding blocks 19 are fixed to the upper and lower sides of the moving block 602. A sliding groove slidably connected to the sliding block 19 is opened inside the injector body 1. By setting the sliding block 19 and the sliding groove, the movement of the moving block 602 can be more stable.

[0037] In addition, the opposite sides of the two moving blocks 602 are fixed to the extrusion block 603, and the opposite sides of the two pushing blocks 601 are provided with inclined surfaces. The extrusion block 603 is a semi-arc plate. The inclined surface is set so that when the pushing block 601 moves downward, the moving block 602 can be squeezed, thereby making the moving block 602 move in the horizontal direction. The sealing gasket 604 is fixed to the injector body 1.

[0038] In general, when the upper baffle 3 pushes the push block 601 to move downward, the inclined surface of the push block 601 will squeeze the moving block 602, so that the moving block 602 slides horizontally inside the injector body 1, which can effectively open the sealing gasket 604 and improve the overall sealing performance.

[0039] The electrical components appearing in the text are all electrically connected to the controller and the power supply. The control method of the utility model is controlled by the controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power supply is also common knowledge in this field. The utility model is mainly used to protect mechanical devices, so the utility model will no longer explain the control method and circuit connection in detail.

[0040] The working principle of the above embodiment is:

[0041] When high-pressure diesel is added to the injector body 1 through the fuel inlet 10, the seal assembly 6 and the connecting rod 4 seal the connection between the injector body 1 and the return port 9, so that the oil pressure on the upper and lower sides of the sealing rod 14 is the same, and the sealing rod 14 cannot move. When the terminal 8 is energized, the coil 7 generates a magnetic field, pulling the upper baffle 3 to move upward, and then the upper baffle 3 pulls the connecting rod 4 and the lower baffle 5 to move upward, so that the diesel on the top can flow upward, thereby reducing the oil pressure on the top of the sealing rod 14 and making the sealing The rod 14 moves upward to open the bottom of the injector body 1, so that diesel can be sprayed out from the nozzle 16. After power failure, the upper baffle 3 is pushed by the reset spring 2 to move downward and reset, so that the push block 601 moves downward to squeeze the moving block 602, so that the moving block 602 moves horizontally, so that the moving block 602 pushes the squeezing block 603 to open the sealing gasket 604, which can effectively reduce the gap between the connecting rod 4 and the injector body 1, and thus can effectively improve the overall sealing.

Claims

1. A high pressure common rail injector, comprising an injector body (1), characterized in that: A return spring (2) is fixed inside the fuel injector body (1), an upper baffle (3) is fixed to the bottom of the return spring (2), a connecting rod (4) slidably connected to the fuel injector body (1) is fixed to the bottom of the upper baffle (3), a lower baffle (5) is fixed to the outer surface of the connecting rod (4), and a sealing assembly (6) is provided at the bottom of the upper baffle (3), and the sealing assembly (6) is used to improve the sealing performance between the connecting rod (4) and the fuel injector body (1); A coil (7) is fixed inside the injector body (1), a wiring terminal (8) is fixed on the top of the coil (7) and extends to the outside of the injector body (1), a return port (9) is fixed on the top of the injector body (1), an oil inlet (10) is fixed on the right side of the injector body (1), a closing component is provided inside the injector body (1), and a nozzle (16) is threadedly connected to the outer surface of the injector body (1); The sealing assembly (6) comprises two pushing blocks (601), two moving blocks (602), two squeezing blocks (603) and a sealing gasket (604); the pushing blocks (601) are fixed to the upper baffle (3); the moving blocks (602) are slidably connected to the injector body (1); opposite sides of the two moving blocks (602) are fixed to the squeezing blocks (603); and the sealing gasket (604) is fixed to the injector body (1).

2. A high pressure common rail injector according to claim 1, characterized in that: A sealing ring (18) is fixed to the bottom of the upper baffle (3), and a sealing groove matching the sealing ring (18) is provided inside the fuel injector body (1).

3. A high pressure common rail injector according to claim 1, characterized in that: The closing assembly comprises a connecting rod (13), a sealing rod (14) and a supporting spring (15); the connecting rod (13) is slidably connected to the fuel injector body (1); the bottom of the connecting rod (13) is fixed to the sealing rod (14) slidably connected to the fuel injector body (1); and the sealing rod (14) and the fuel injector body (1) are fixed to the supporting spring (15).

4. A high pressure common rail injector according to claim 1, characterized in that: Sliding blocks (19) are fixed to both the upper and lower sides of the moving block (602), and a sliding groove slidably connected to the sliding block (19) is provided inside the fuel injector body (1).

5. A high pressure common rail injector according to claim 2, characterized in that: The two pushing blocks (601) are each provided with an inclined surface on one side opposite to the other. The squeezing block (603) is a semi-arc plate, and the sealing ring (18) is an annular ring.

6. A high pressure common rail injector according to claim 1, characterized in that: The fuel injector body (1) has a return passage (12) in communication with the fuel inlet (10) and the fuel injector body (1) has a high-pressure flow passage (11) in communication with the return passage (12).

7. A high pressure common rail injector according to claim 6, characterized in that: The oil inlet (10), the return channel (12), the high-pressure flow channel (11), the return port (9) and the nozzle (16) are interconnected.

8. A high pressure common rail injector according to claim 1, characterized in that: The upper baffle (3) is an armature baffle, and a spray hole (17) is provided inside the spray head (16).

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