A double-stage seal injection valve for ammonia fuel engine

Abstract

The utility model discloses an ammonia fuel engine anti -leakage two -stage sealed injection valve of engine injection valve technical field, include: valve body and be equipped with on fuel passage, valve rod, elastic part, valve seat, valve core and electromagnet of valve body, be equipped with moving block on the lateral wall of valve core, be equipped with push block on moving block, be equipped with mounting hole in the valve body, push block slide and insert in mounting hole, the liquid supply assembly is connected to mounting hole, be equipped with sealed buffer assembly on push block, and the liquid supply assembly is set up in the injection valve in this application, and the valve core structure is cooperated, in the process that elastic part drives valve rod reset to close valve body injection hole, injects liquid to mounting hole, and the push block, moving block and valve core produce axial displacement to the valve seat and add additional hydraulic pressure to the valve seat, realize secondary pressurization to valve seat sealing surface, effectively enhance the adhesion strength between valve seat and sealing surface, significantly reduce the risk of leakage due to small gap or surface defect.

Description

Technical Field

[0001] This utility model relates to the field of engine injection valves, specifically to a leak-proof dual-stage sealing injection valve for ammonia fuel engines. Background Technology

[0002] With the increasing global demand for low-carbon and zero-carbon energy, ammonia, as a clean energy carrier that is carbon-free, renewable, easy to store and transport, is gradually becoming one of the important alternative fuels in the field of internal combustion engines. In ammonia fuel engines, the fuel injection system is the core component for achieving efficient and clean combustion, and the sealing performance of the injection valve, as the execution terminal of fuel supply, is directly related to the engine's safety, environmental protection and operational reliability.

[0003] Currently, most common ammonia fuel injection valves use electromagnetic drive, which controls the up-and-down movement of the valve needle by controlling the energization of the electromagnetic coil to open and close the injection orifice. During the closing process, a single elastic element (such as a compression spring) usually pushes the valve seat or valve needle back to its original position, causing the valve seat to press tightly against the sealing surface, thereby cutting off the fuel passage. However, after long-term operation, elastic elements such as springs are prone to stress relaxation or fatigue deformation, resulting in a decrease in the preload applied to the valve seat, which cannot guarantee the continuous contact of the sealing surface and causes poor sealing. In addition, ammonia is corrosive to metal materials, especially in the presence of moisture, it will generate an alkaline environment, which accelerates the corrosion and fretting wear of the contact surface between the valve seat and the valve body, making it difficult for a single elastic pressure to compensate for the resulting sealing gap. Utility Model Content

[0004] The purpose of this invention is to provide a two-stage sealing injection valve for preventing leakage in ammonia fuel engines, which solves the problems of existing single-stage elastic sealing structures.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a two-stage sealing injection valve for preventing leakage in an ammonia fuel engine, comprising: a valve body and a fuel passage, valve stem, elastic element, valve seat, valve core, and electromagnet provided on the valve body; a movable block is provided on the side wall of the valve core; a push block is provided on the movable block; an installation hole is provided in the valve body; the push block is slidably inserted into the installation hole; the installation hole is connected to a liquid supply assembly; a sealing buffer assembly is provided on the push block; the liquid supply assembly is used to supply liquid to the installation hole and push the valve core and valve seat to reset via the push block and the movable block.

[0006] Preferably, the liquid supply assembly includes a storage tank, a push plate slidably disposed in the storage tank, and a driving component for moving the push plate, wherein the storage tank is connected to the mounting hole via a conduit.

[0007] Preferably, the tank is equipped with a pressure sensor for detecting liquid pressure, and the liquid supply assembly further includes a controller for controlling the start of the drive unit when the liquid pressure detected by the pressure sensor is lower than a threshold.

[0008] Preferably, a storage box is connected to the side wall of the storage tank, and a pressure plate for connecting with the push plate is slidably provided inside the storage box.

[0009] Preferably, the push plate has a guide plate on its side wall, the guide plate is slidably connected to the pressure plate, and the pressure plate moves in the same direction as the push plate.

[0010] Preferably, there are two sets of push blocks and mounting holes, with the two sets of push blocks located on the front and rear sides of the moving block's movement direction, respectively.

[0011] Preferably, the sealing buffer assembly includes a kit, a sealing ring disposed on the kit, a movable block slidably inserted into the kit, a spring disposed between the kit and the movable block, and a pressure block disposed on the movable block, wherein the diameter of the pressure block gradually increases toward the side away from the movable block.

[0012] Preferably, the diameter of the end of the pressure block furthest from the movable block is greater than the inner diameter of the sealing ring, and the diameter of the end of the pressure block furthest from the movable block is smaller than the outer diameter of the sealing ring.

[0013] The beneficial effects of this utility model are as follows: By setting a liquid supply component in the injection valve and working in conjunction with the valve core structure, liquid is injected into the mounting hole during the process of the elastic element driving the valve stem to reset and close the injection hole of the valve body. This pushes the push block, the moving block and the valve core to produce axial displacement, thereby applying additional hydraulic pressure to the valve seat and realizing active secondary pressurization of the valve seat sealing surface. This hydraulic pressure is superimposed with the spring preload to form a dual-stage sealing pressure of "mechanical spring force + hydraulic force amplification", which effectively enhances the fit strength between the valve seat and the sealing surface and significantly reduces the risk of leakage caused by small gaps or surface defects. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the anti-leakage dual-stage sealing injection valve structure for ammonia fuel engines according to this utility model; Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a schematic diagram of the liquid supply component structure of this utility model; Figure 4 This is a schematic diagram of the sealing and buffer assembly structure of this utility model; Figure 5 This utility model Figure 3 Enlarged schematic diagram of the structure at point B.

[0015] In the diagram: 1. Valve body; 2. Fuel passage; 3. Valve stem; 4. Elastic element; 5. Valve seat; 6. Valve core; 7. Electromagnet; 8. Liquid supply assembly; 801. Storage tank; 802. Push plate; 803. Drive component; 804. Pressure sensor; 805. Controller; 806. Storage box; 807. Pressure plate; 808. Guide plate; 9. Moving block; 10. Push block; 11. Sealing buffer assembly; 111. Kit; 112. Sealing ring; 113. Moving block; 114. Pressure block; 115. Spring component; 12. Mounting hole; 13. Conduit. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0017] Example 1 Please see Figure 1 A leak-proof dual-stage sealing injection valve for ammonia fuel engines includes: a valve body 1, a fuel passage 2 and an injection hole on the valve body 1, the fuel passage 2 and the injection hole being connected, a valve stem 3 slidingly disposed inside the valve body 1, a valve seat 5 installed at one end of the valve stem 3, a valve core 6 (armature) installed at the other end, an elastic element 4 (spring) between the valve body 1 and the valve core 6, and an electromagnet 7 disposed inside the valve body 1, the electromagnet 7 being used to attract the valve core 6 so that the valve stem 3 moves with the valve seat 5.

[0018] Please see Figure 1 and Figure 2 A movable block 9 is provided on the side wall of the valve core 6, and a push block 10 is provided on the top of the movable block 9. An installation hole 12 is provided inside the valve body 1. The installation hole 12 is located above the movable block 9. The push block 10 is slidably inserted into the installation hole 12. The installation hole 12 is connected to the liquid supply component 8. A sealing buffer component 11 is provided on the push block 10.

[0019] It should be noted that when the electromagnet 7 is energized, it generates magnetic force, attracting the valve core 6, which moves the valve stem 3 and valve seat 5 upward, opening the injection hole, and ammonia fuel is injected from the injection hole through the fuel channel 2. When the electromagnet 7 is de-energized, the magnetic attraction force on the valve core 6 disappears, and under the action of the elastic element 4, the valve stem 3 moves downward to reset, causing the valve seat 5 to move downward and close the injection hole of the valve body 1. At the same time, the liquid supply component 8 supplies liquid into the mounting hole 12 to press down the push block 10, the moving block 9 and the valve core 6, increasing the downward pressure on the valve seat 5. When the injection hole needs to be opened, the electromagnet 7 is energized, causing the valve core 6 to move upward with the valve stem 3 and valve seat 5. At the same time, the liquid supply component 8 will draw back the liquid input into the mounting hole 12, causing the pressure on the push block 10 to disappear.

[0020] It should also be noted that multiple moving blocks 9 are evenly installed on the side wall of the valve core 6 (for example, when there are two moving blocks 9, the two moving blocks 9 are distributed on the left and right sides of the valve core 6), so that the force applied by the moving blocks 9 to the valve core 6 is uniform.

[0021] In this embodiment, as a further optimization, please refer to... Figure 2 and Figure 3 The liquid supply assembly 8 includes a storage tank 801, a push plate 802 slidably disposed in the inner cavity of the storage tank 801, and a driving component 803 (such as an electric push rod). The driving component 803 is mounted on the storage tank 801, and the moving end of the driving component 803 is connected to the push plate 802 to drive the push plate 802 to move. The push plate 802 is equivalent to a piston, and its movement can change the amount of liquid inside the storage tank. The top of the inner cavity of the storage tank 801 is connected to the mounting hole 12 through a conduit 13. The tank is filled with liquid (such as oil). When the valve stem 3, along with the valve seat 5, resets and opens the injection hole, the drive member 803 drives the push plate 802 to move upward, pushing the liquid at the top of the inner cavity of the tank 801 through the conduit 13 into the upper mounting hole 12. This causes the liquid to exert downward pressure on the push block 10 in the mounting hole 12, thereby pressurizing the valve seat 5. The drive member 803 moves downward with the push plate 802, creating a negative pressure at the top of the inner cavity of the tank 801, which is used to extract the liquid inside the upper mounting hole 12.

[0022] In this embodiment, as a further optimization, please refer to... Figure 3 A pressure sensor 804 is installed in the inner cavity of the storage tank 801. The pressure sensor 804 is used to detect the liquid pressure at the top of the inner cavity of the storage tank 801. The liquid supply assembly 8 also includes a controller 805 (such as a PLC controller). When the elastic element 4 pulls the valve stem 3 and valve seat 5 to reset and close the injection hole, and the drive element 803 drives the push plate 802 to move upward, the pressure sensor 804 detects the liquid pressure at the top of the inner cavity of the storage tank 801 and transmits the information to the controller 805. When the drive element 803 moves to a predetermined position and stops, and the liquid pressure detected by the pressure sensor 804 is lower than the threshold, the controller 805 controls the drive element 803 to continue working and drive the push plate 802 to move upward until the liquid pressure at the top of the inner cavity of the storage tank 801 reaches the threshold, so that the force applied by the liquid supply assembly 8 to the push block 10 does not decrease, so that the force on the valve seat 5 is stable, and so that the injection valve does not leak.

[0023] In this embodiment, as a further optimization, please refer to... Figure 3 and Figure 5A storage box 806 is connected to the side wall of the storage box 801. A pressure plate 807 is slidably installed in the inner cavity of the storage box 806. A guide plate 808 is slidably installed on the side wall of the pressure plate 807. The side wall of the guide plate 808 is connected to the push plate 802. The moving direction of the pressure plate 807 on the guide plate 808 is the same as the moving direction of the push plate 802. The front and rear side walls of the guide plate 808 are respectively in contact with the front and rear inner walls of the storage box 801. When the driving member 803 drives the push plate 802 to move upward, so that the push plate 802 can no longer move, the push plate 802 is located above the storage box 806. When the injection port is opened, the drive unit 803 drives the push plate 802 to move down until the top of the inner cavity of the storage tank 801 is connected to the collection box 806, increasing the space for liquid to be collected at the top of the inner cavity of the storage tank 801 (and the increased space is not linearly increased due to the movement of the push plate 802). When the top of the inner cavity of the storage tank 801 is connected to the collection box 806, the liquid collected at the top of the inner cavity of the storage tank 801 increases at one time, thereby accelerating the return of the liquid inside the upper mounting hole 12 to the top of the inner cavity of the storage tank 801, so that the push block 10 and the moving block 9 will not obstruct the upward movement of the valve core 6, ensuring that the injection port can be opened normally.

[0024] In this embodiment, as a further optimization, please refer to... Figure 4 The sealing and buffering assembly 11 includes a kit 111, a sealing ring 112 (made of rubber) disposed on the kit 111, a movable block 113 slidably inserted into the kit 111 (the outer wall of the movable block 113 is fully fitted with the inner wall of the kit 111, and the two are sealed to prevent liquid from entering the inner cavity of the kit 111 through the gap between them), a spring 115 disposed between the kit 111 and the movable block 113, and a pressure block 114 disposed on the movable block 113. The kit 111 is installed on the side wall of the push block 10 away from the moving block 9. The diameter of the pressure block 114 gradually increases towards the side away from the movable block 113. The diameter of the end of the pressure block 114 away from the movable block 113 is larger than the inner diameter of the sealing ring 112, and the diameter of the end of the pressure block 114 away from the movable block 113 is smaller than the inner diameter of the sealing ring 112. The outer diameter of 12; when liquid is injected into the inner cavity of mounting hole 12, the liquid will pressurize the pressure block 114, causing the movable block 113 to move into the inner cavity of kit 111. During this process, the pressure block 114 will squeeze the sealing ring 112, making it fit tightly against the inner wall of mounting hole 12, increasing the sealing between mounting hole 12 and push block 10, and preventing liquid leakage in mounting hole 12; and the tight fit between sealing ring 112 and inner wall of mounting hole 12 will increase the friction between the two, thereby reducing the downward movement speed of push block 10 in mounting hole 12, slowing down the downward movement speed of valve stem 3, preventing valve seat 5 from moving down quickly under the action of elastic element 4 and colliding with valve body 1, reducing the wear of valve seat 5, ensuring tight fit between valve seat 5 and valve body 1, and ensuring the sealing of injection valve.

[0025] Example 2 As a further optimization of Example 1, please refer to Figure 1 and Figure 2 There are two sets of push blocks 10 and mounting holes 12. The two sets of push blocks 10 are located on the front and rear sides of the moving block 9 respectively. The bottom of the inner cavity of the storage tank 801 is connected to the lower mounting hole 12 through the conduit 13. The bottom of the inner cavity of the storage tank 801 is filled with liquid. When the injection hole is opened and the push plate 802 moves downward, the liquid at the bottom of the inner cavity of the storage tank 801 will enter the inner cavity of the lower mounting hole 12 to provide an upward pressure on the lower push block 10, which is used to push the moving block 9 and the valve core 6 upward to ensure that the injection hole of the valve body 1 is opened.

[0026] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A leak-proof, two-stage sealed injection valve for an ammonia fuel engine, comprising: The valve body (1) and the fuel passage (2), valve stem (3), elastic element (4), valve seat (5), valve core (6) and electromagnet (7) provided on the valve body (1) are characterized in that a moving block (9) is provided on the side wall of the valve core (6), a push block (10) is provided on the moving block (9), an installation hole (12) is provided in the valve body (1), the push block (10) is slidably inserted into the installation hole (12), the installation hole (12) is connected to a liquid supply assembly (8), a sealing buffer assembly (11) is provided on the push block (10), and the liquid supply assembly (8) is used to supply liquid to the installation hole (12) and push the valve core (6) and valve seat (5) to reset by the push block (10) and the moving block (9).

2. The ammonia fuel engine anti-leakage dual-stage sealing injection valve according to claim 1, characterized in that, The liquid supply assembly (8) includes a storage tank (801), a push plate (802) slidably disposed in the storage tank (801), and a drive component (803) for driving the push plate (802) to move. The storage tank (801) is connected to the mounting hole (12) through a conduit (13).

3. The ammonia fuel engine anti-leakage dual-stage sealing injection valve according to claim 2, characterized in that, The storage tank (801) is equipped with a pressure sensor (804) for detecting liquid pressure. The liquid supply assembly (8) also includes a controller (805), which controls the drive unit (803) to start when the liquid pressure detected by the pressure sensor (804) is lower than a threshold.

4. The ammonia fuel engine anti-leakage dual-stage sealing injection valve according to claim 2, characterized in that, A storage box (806) is connected to the side wall of the storage tank (801), and a pressure plate (807) for connecting with the push plate (802) is slidably provided inside the storage box (806).

5. The ammonia fuel engine anti-leakage dual-stage sealing injection valve according to claim 4, characterized in that, The push plate (802) has a guide plate (808) on its side wall. The guide plate (808) is slidably connected to the pressure plate (807). The moving direction of the pressure plate (807) on the guide plate (808) is the same as the moving direction of the push plate (802).

6. The ammonia fuel engine anti-leakage dual-stage sealing injection valve according to claim 1, characterized in that, There are two sets of push blocks (10) and mounting holes (12), and the two sets of push blocks (10) are located on the front and rear sides of the moving block (9) in the moving direction, respectively.

7. The ammonia fuel engine anti-leakage dual-stage sealing injection valve according to claim 1, characterized in that, The sealing buffer assembly (11) includes a kit (111), a sealing ring (112) disposed on the kit (111), a movable block (113) slidably inserted into the kit (111), a spring (115) disposed between the kit (111) and the movable block (113), and a pressure block (114) disposed on the movable block (113), the diameter of the pressure block (114) gradually increasing toward the side away from the movable block (113).

8. The ammonia fuel engine anti-leakage dual-stage sealing injection valve according to claim 7, characterized in that, The diameter of the end of the pressure block (114) away from the movable block (113) is greater than the inner diameter of the sealing ring (112), and the diameter of the end of the pressure block (114) away from the movable block (113) is smaller than the outer diameter of the sealing ring (112).

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