Anti-leakage two-stage sealing injection valve of ammonia fuel engine

Abstract

The invention discloses an ammonia fuel engine leakproof two-stage sealing injection valve in the technical field of engine injection valves, which comprises a valve body, and a fuel channel, a valve rod, an elastic piece, a valve seat, a valve core and an electromagnet which are arranged on the valve body, a moving block is arranged on the side wall of the valve core, a push block is arranged on the moving block, a mounting hole is formed in the valve body, and the push block is arranged in the mounting hole. According to the injection valve, the liquid supply assembly is arranged in the injection valve and cooperates with the valve element structure, in the process that the elastic piece drives the valve rod to reset so as to close the injection hole of the valve body, liquid is injected into the installation hole, and the liquid supply assembly and the valve element structure work together to close the injection hole of the valve body; when the valve seat is pressed, the push block, the movable block and the valve element are pushed to generate axial displacement, so that additional hydraulic force is applied to the valve seat, active secondary pressurization on the sealing surface of the valve seat is realized, the attaching strength between the valve seat and the sealing surface is effectively enhanced, and the leakage risk caused by a tiny gap or surface defects is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the field of engine injection valves, and in particular to an anti-leakage double-stage sealing injection valve for an ammonia fuel engine. Background Art

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

[0003] At present, most common ammonia fuel injection valves use electromagnetic drive, which drives the valve needle up and down by controlling the power on and off of the electromagnetic coil to open and close the injection hole. During the closing process, a single elastic member (such as a compression spring) is usually used to push the valve seat or valve needle to reset, so that the valve seat is pressed against the sealing surface, thereby cutting off the fuel path. However, after working for a long time, elastic elements such as springs are prone to stress relaxation or fatigue deformation, resulting in a decrease in the preload force applied to the valve seat, which cannot ensure the continuous fit of the sealing surface and causes a loose seal. In addition, ammonia is corrosive to metal materials, especially in the presence of moisture, which will generate an alkaline environment, accelerating the corrosion and micro-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. Summary of the Invention

[0004] The object of the present invention is to provide an anti-leakage double-stage sealing injection valve for an ammonia fuel engine, which solves the problems existing in the existing single-stage elastic sealing structure.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions: an anti-leakage two-stage sealed injection valve for an ammonia fuel engine, comprising: a valve body and a fuel channel, a valve stem, an elastic part, a valve seat, a valve core and an electromagnet arranged on the valve body, a moving block is provided on the side wall of the valve core, a push block is provided on the moving block, a mounting hole is provided in the valve body, the push block is slidably inserted in the mounting hole, the mounting hole is connected to a liquid supply component, a sealing buffer component is provided on the push block, and the liquid supply component is used to supply liquid into the mounting hole when the electromagnet is powered off and the elastic part brings the valve stem to reset so that the valve seat closes the injection hole of the valve body, so as to squeeze the push block, the moving block and the valve core to increase the pressure on the valve seat.

[0006] Preferably, the liquid supply assembly includes a storage tank, a push plate slidably arranged in the storage tank, and a driving member for driving the push plate to move, and the storage tank is connected to the mounting hole through a conduit.

[0007] Preferably, a pressure sensor for detecting liquid pressure is provided in the storage tank, and the liquid supply assembly further comprises a controller, which is used to control the driving member to start when the liquid pressure detected by the pressure sensor is lower than a threshold value.

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

[0009] Preferably, a guide plate is provided on the side wall of the push plate, the guide plate is slidably connected to the pressure plate, and the moving direction of the pressure plate on the guide plate is the same as the moving direction of the push plate.

[0010] Preferably, there are two groups of push blocks and mounting holes, and the two groups of push blocks are respectively located at the front and rear sides of the moving direction of the moving block.

[0011] Preferably, the sealing buffer assembly includes a kit, a sealing ring provided on the kit, a movable block slidably inserted in the kit, a spring member provided between the kit and the movable block, and a pressure block provided 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 one end of the pressing block away from the movable block is larger than the inner diameter of the sealing ring, and the diameter of one end of the pressing block away from the movable block is smaller than the outer diameter of the sealing ring.

[0013] The beneficial effect of the present invention is that: by arranging a liquid supply component in the injection valve and cooperating with the valve core structure, in the process of the elastic member driving the valve stem to reset to close the valve body injection hole, liquid is injected into the mounting hole, pushing the push block, the moving block and the valve core to produce axial displacement, thereby applying additional liquid pressure to the valve seat, realizing active secondary pressurization of the valve seat sealing surface. The liquid pressure is superimposed on the spring preload force to form a two-stage sealing pressure of "mechanical spring force + hydraulic force enhancement", which effectively enhances the fitting strength between the valve seat and the sealing surface, and significantly reduces the risk of leakage caused by small gaps or surface defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the anti-leakage double-stage sealed injection valve for an ammonia fuel engine according to the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the structure at center A; Figure 3 This is a schematic structural diagram of the liquid supply assembly of the present invention; Figure 4 This is a schematic structural diagram of the sealing and buffering assembly of the present invention; Figure 5 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B in the middle.

[0015] In the figure: 1. Valve body; 2. Fuel channel; 3. Valve stem; 4. Elastic member; 5. Valve seat; 6. Valve core; 7. Electromagnet; 8. Liquid supply assembly; 801. Storage tank; 802. Push plate; 803. Drive member; 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. Movable block; 114. Pressure block; 115. Spring member; 12. Mounting hole; 13. Conduit. DETAILED DESCRIPTION

[0016] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0017] Example 1 See also Figure 1 A leakage-proof double-stage sealed injection valve for an ammonia fuel engine includes: a valve body 1, a fuel channel 2 and an injection hole are opened on the valve body 1, the fuel channel 2 is connected to the injection hole, a valve stem 3 is slidably provided in the valve body 1, a valve seat 5 is installed at one end of the valve stem 3, and a valve core 6 (armature) is installed at the other end, an elastic member 4 (spring) is provided between the valve body 1 and the valve core 6, and an electromagnet 7 is provided in the valve body 1, which is used to adsorb the valve core 6 so that the valve stem 3 moves with the valve seat 5.

[0018] See also Figure 1 and Figure 2 A moving 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 moving block 9. A mounting hole 12 is opened in the valve body 1, and the mounting hole 12 is located above the moving block 9. The push block 10 is slidably inserted into the mounting hole 12. The mounting hole 12 is connected to the liquid supply component 8, and 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, causing it to move upward with the valve stem 3 and the valve seat 5, opening the injection hole, and the ammonia fuel is ejected 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 member 4, the valve stem 3 moves downward and resets, causing the valve seat 5 to move downward, closing the injection hole of the valve body 1, and at the same time, the liquid supply component 8 supplies liquid into the mounting hole 12 to squeeze the push block 10, the moving block 9 and the valve core 6 downward, so that the downward pressure on the valve seat 5 increases; 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 the valve seat 5, and at the same time, the liquid supply component 8 will draw back the liquid input into the mounting hole 12, so that the pressure on the push block 10 disappears.

[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 exerted by the moving blocks 9 on the valve core 6 is uniform.

[0021] In this embodiment, as a further optimization solution, please refer to Figure 2 and Figure 3 The liquid supply assembly 8 includes a storage tank 801, a push plate 802 slidingly arranged in the inner cavity of the storage tank 801, and a driving member 803 (such as an electric push rod). The driving member 803 is installed on the storage tank 801. The moving end of the driving member 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. 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 the conduit 13. The top of the inner cavity of the storage tank 801 is connected to the mounting hole 12. It is filled with liquid (such as oil); when the valve stem 3 brings the valve seat 5 back to its original position to open the injection hole, the driving member 803 drives the push plate 802 to move upward, pushing the liquid at the top of the inner cavity of the storage tank 801 into the upper mounting hole 12 through the conduit 13, so that the liquid exerts downward pressure on the push block 10 in the mounting hole 12, thereby exerting pressure on the valve seat 5; the driving member 803 brings the push plate 802 downward, generating negative pressure at the top of the inner cavity of the storage tank 801, which is used to extract the liquid inside the upper mounting hole 12.

[0022] In this embodiment, as a further optimization solution, please refer to Figure 3 A pressure sensor 804 is provided 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 component 8 also includes a controller 805 (such as a PLC controller); when the elastic member 4 pulls the valve stem 3 and the valve seat 5 to reset and close the injection hole, the driving member 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 driving member 803 reaches a predetermined position and stops, and the liquid pressure detected by the pressure sensor 804 is lower than the threshold value at this time, the controller 805 controls the driving member 803 to continue working and drives 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 value, so that the force applied by the liquid supply component 8 to the push block 10 will not decrease, the force applied to the valve seat 5 is stable, and it is ensured that the injection valve will not leak.

[0023] In this embodiment, as a further optimization solution, please refer to Figure 3 and Figure 5, a storage box 806 is connected to the side wall of the storage box 801, and a pressure plate 807 is slidably provided in the inner cavity of the storage box 806. A guide plate 808 is slidably provided on the side wall of the pressure plate 807. The side wall of the guide plate 808 is connected to the push plate 802, and 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 side inner walls of the storage box 801; when the driving member 803 drives the push plate 802 to move up, so that the push plate 802 moves up to a point where it cannot move, the push plate 802 is located above the storage box 806; when opening When the injection hole is opened, the driving member 803 drives the push plate 802 to move downward until the top of the inner cavity of the storage tank 801 is connected with the receiving box 806, thereby increasing the space for storing liquid at the top of the inner cavity of the storage tank 801 (and the increased space does not increase linearly due to the movement of the push plate 802). When the top of the inner cavity of the storage tank 801 is connected with the receiving box 806, the amount of liquid stored at the top of the inner cavity of the storage tank 801 at one time increases, thereby accelerating the recovery of the liquid in 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 hinder the upward movement of the valve core 6, ensuring that the injection hole can be opened normally.

[0024] In this embodiment, as a further optimization solution, please refer to Figure 4 The sealing buffer assembly 11 includes a kit 111, a sealing ring 112 (made of rubber) provided 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 from between the two), a spring member 115 provided between the kit 111 and the movable block 113, and a pressure block 114 provided on the movable block 113. The kit 111 is installed on a side wall of the push block 10 away from the moving block 9, and the diameter of the pressure block 114 gradually increases toward 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 1 12 outer diameter; when the liquid is injected into the inner cavity of the mounting hole 12, the liquid will exert pressure on the pressure block 114, causing the movable block 113 to move into the inner cavity of the kit 111. In this process, the pressure block 114 will squeeze the sealing ring 112, so that it fits tightly with the inner wall of the mounting hole 12, thereby increasing the sealing between the mounting hole 12 and the push block 10 and preventing the liquid in the mounting hole 12 from leaking; and the sealing ring 112 fits tightly with the inner wall of the mounting hole 12, which will increase the friction between the two, thereby reducing the speed at which the push block 10 moves downward in the mounting hole 12, slowing down the downward movement of the valve stem 3, and preventing the valve seat 5 from moving rapidly downward under the action of the elastic member 4 and colliding with the valve body 1, reducing the loss of the valve seat 5, ensuring that the valve seat 5 and the valve body 1 fit tightly, and ensuring the sealing of the injection valve.

[0025] Example 2 As a further optimization solution of Example 1, please refer to Figure 1 and Figure 2 There are two groups of push blocks 10 and mounting holes 12. The two groups of push blocks 10 are respectively located on the front and rear sides of the moving direction of the moving block 9. The bottom of the inner cavity of the storage tank 801 is connected with the lower mounting hole 12 through the conduit 13, and 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, which is used 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 will be opened.

[0026] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. An anti-leakage double-stage sealing injection valve for an ammonia fuel engine, comprising: A valve body (1) and a fuel passage (2), a valve stem (3), an elastic member (4), a valve seat (5), a valve core (6) and an electromagnet (7) arranged on the valve body (1), 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), a mounting hole (12) is provided in the valve body (1), the push block (10) is slidably inserted in the mounting hole (12), the mounting hole (12) is connected to a liquid supply component (8), a sealing buffer component (11) is provided on the push block (10), and the liquid supply component (8) is used to supply liquid into the mounting hole (12) when the electromagnet (7) is powered off and the elastic member (4) brings the valve stem (3) back to its original position so that the valve seat (5) closes the injection hole of the valve body (1), so as to squeeze the push block (10), the moving block (9) and the valve core (6), thereby increasing the pressure on the valve seat (5).

2. The anti-leakage double-stage sealing injection valve for an ammonia fuel engine according to claim 1, characterized in that: The liquid supply assembly (8) comprises a storage box (801), a push plate (802) slidably arranged in the storage box (801), and a driving member (803) for driving the push plate (802) to move. The storage box (801) is connected to the mounting hole (12) through a conduit (13).

3. The anti-leakage double-stage sealing injection valve for an ammonia fuel engine according to claim 2, characterized in that: A pressure sensor (804) for detecting liquid pressure is provided in the storage tank (801), and the liquid supply assembly (8) further comprises a controller (805). The controller (805) is used to control the driving member (803) to start when the liquid pressure detected by the pressure sensor (804) is lower than a threshold value.

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

5. The anti-leakage double-stage sealing injection valve for an ammonia fuel engine according to claim 4, characterized in that: A guide plate (808) is provided on the side wall of the push plate (802), and 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 anti-leakage double-stage sealing injection valve for an ammonia fuel engine according to claim 1, characterized in that: There are two groups of push blocks (10) and mounting holes (12), and the two groups of push blocks (10) are respectively located at the front and rear sides of the moving direction of the moving block (9).

7. The anti-leakage double-stage sealing injection valve for an ammonia fuel engine according to claim 1, characterized in that: The sealing buffer assembly (11) comprises a sleeve (111), a sealing ring (112) provided on the sleeve (111), a movable block (113) slidably inserted into the sleeve (111), a spring member (115) provided between the sleeve (111) and the movable block (113), and a pressure block (114) provided on the movable block (113), wherein the diameter of the pressure block (114) gradually increases toward a side away from the movable block (113).

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

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