A methanol injector

Abstract

The present application relates to the internal combustion engine technical field, especially a kind of methanol injector.The throttle plate is arranged in the injector body, the throttle plate is provided with the first inverted cone hole and the second inverted cone hole that are communicated with each other, the ball is arranged in the first inverted cone hole, and the second inverted cone hole can be opened or closed, the first accommodating cavity is arranged between the one end of plunger and the throttle plate, the first accommodating cavity is communicated with the second inverted cone hole, the inlet is communicated with the first accommodating cavity, the outlet is communicated with the first inverted cone hole, one end of the alcohol nozzle cap is connected to the other end of the injector body, the needle valve is slidably arranged in the alcohol nozzle cap to open or close the alcohol injection port, the second accommodating cavity is communicated with the inlet, and the methanol acts on the pressure-bearing surface to open the alcohol injection port.The methanol injector sets throttle plate and sets the second inverted cone hole, realizes multistage pressure reduction, thereby reduces the pressure difference of fluid flowing into the first inverted cone hole, delays the cavitation damage of sealing surface and the area near sealing surface caused by methanol vaporization, and prolongs its service life.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine technology, and more particularly to a methanol injector. Background Technology

[0002] Methanol is widely recognized as a promising and clean alternative fuel for internal combustion engines due to its wide availability, ease of storage and transportation, high oxygen content, good combustion performance, and low emissions.

[0003] However, because methanol is corrosive, has a low boiling point, and is easily vaporized, when the injector injects methanol, the vaporization of methanol will cause cavitation on the injector sealing surface and the area near the sealing surface, reducing the service life of the injector.

[0004] Patent document CN202410340793.5 discloses a methanol injector. By improving the structure of the valve body sealing surface or needle valve sealing surface and by setting a throttling orifice at the return oil outlet, it reduces the pressure drop before and after the needle valve sealing surface and the return oil valve seat sealing surface, thus improving the cavitation problem of the nozzle and return oil valve. It also reduces the cavitation problem of the needle valve and needle valve body by adopting a stepped nozzle structure, while improving spray performance. This injector improves the impact of cavitation during methanol injection, but it cannot solve the cavitation problem when the control valve is depressurized.

[0005] Patent document with application publication number CN202310643512.9 discloses a methanol injector that solves the problem of rapid wear of the control valve by introducing diesel lubrication and increases the service life of the injector. The injector improves the sealing corrosion of the methanol injector control valve, but cannot solve the cavitation problem when the control valve is depressurized, and the structure is complex.

[0006] Patent document with application publication number CN202211695805.3 discloses a low-carbon fuel injector that enables low-carbon fuel to achieve a thermal efficiency of about 50% similar to diesel in an internal combustion engine and improves the service life of the injector. It separates the injected fuel and control oil into two liquids, which improves the wear problem of the injector control valve, but the structure and control are complex.

[0007] Both CN202310643512.9 and CN202211695805.3 introduce a second medium, which has the disadvantages of system complexity, high cost, and mutual penetration between the two media affecting control functions and combustion.

[0008] Therefore, there is an urgent need for a methanol injector to solve the above-mentioned technical problems. Summary of the Invention

[0009] The purpose of this invention is to provide a methanol injector that simplifies the structure, reduces the risk of methanol vaporization corrosion, delays cavitation damage to the sealing surface and surrounding area caused by methanol vaporization, and extends the service life of the injector.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] A methanol injector includes: an injector body, a solenoid valve, a first elastic element, an armature rod, a ball, a throttling plate, a plunger, an injection nozzle, and a second elastic element. The solenoid valve is disposed at one end of the injector body. The throttling plate is disposed within the injector body and has a first inverted conical orifice and a second inverted conical orifice that communicate with each other. The ball is disposed in the first inverted conical orifice and is capable of opening or closing the second inverted conical orifice. The armature rod is slidably disposed within the injector body, with one end of the armature rod abutting against the ball. The first elastic element is configured to always have a tendency to drive the armature rod to push the ball to close the second inverted conical orifice. The plunger is slidably disposed within the injector body, and a first receiving cavity is provided between one end of the plunger and the throttling plate, the first receiving cavity communicating with the second inverted conical orifice. The injector body has an inlet and an outlet. The inlet communicates with the first receiving cavity, and the outlet communicates with the first inverted conical hole. The alcohol spray nozzle includes an alcohol spray nozzle cap and a needle valve. One end of the alcohol spray nozzle cap is connected to the other end of the injector body, and the other end of the alcohol spray nozzle cap has an alcohol spray port. The needle valve is slidably disposed in the alcohol spray nozzle cap to open or close the alcohol spray port. The second elastic element is configured to always have the tendency to drive the needle valve to close the alcohol spray port. The alcohol spray nozzle cap has a second receiving cavity, which communicates with the inlet. The needle valve has a pressure-bearing surface, and methanol can act on the pressure-bearing surface to open the alcohol spray port. The needle valve, the plunger, the second elastic element, the armature rod, the inner wall of the inlet, and the inner wall of the outlet are all treated with alcohol resistance.

[0012] As a preferred embodiment of the methanol injector described above, the methanol injector further includes a ball seat, which is disposed between the armature rod and the ball. The ball seat has a groove, and a portion of the ball seat is embedded in the groove.

[0013] In a preferred embodiment of the aforementioned methanol injector, the ball seat, the ball, and the throttling plate are all made of ceramic.

[0014] As a preferred embodiment of the methanol injector described above, the cross-sectional area of ​​the first inverted conical orifice is larger than the cross-sectional area of ​​the second inverted conical orifice.

[0015] As a preferred technical solution of the above-mentioned methanol injector, the solenoid valve includes an electromagnet, a locking cap, an armature, and an adjusting member. The two ends of the locking cap are respectively connected to the injector body and the electromagnet. The armature is disposed between the throttling plate and the electromagnet. The electromagnet is provided with a sliding groove. One end of the armature rod is slidably disposed in the sliding groove, and the other end of the armature rod passes through the armature and abuts against the ball. The adjusting member is disposed between the electromagnet and the injector body.

[0016] As a preferred embodiment of the methanol injector described above, the methanol injector further includes a valve seat, which is disposed between the armature and the throttling plate, and the other end of the armature rod passes through the valve seat and abuts against the ball.

[0017] As a preferred embodiment of the methanol injector described above, the methanol injector further includes a third elastic element, which is configured to always have a tendency to drive the valve seat to move closer to the throttle plate.

[0018] As a preferred technical solution of the above-mentioned methanol injector, the injection nozzle further includes a valve body, which is fixed inside the injection nozzle cap. The valve body is provided with the injection port, and the needle valve is slidably disposed on the valve body.

[0019] As a preferred embodiment of the methanol injector described above, the injector nozzle further includes a transition block disposed between the injector body and the valve body.

[0020] As a preferred technical solution of the above-mentioned methanol injector, the methanol nozzle further includes a push rod, the transition block is provided with a limiting hole, one end of the push rod abuts against the plunger, the other end of the push rod is inserted into the limiting hole and abuts against the needle valve, and the end face of the other end of the push rod can abut against the hole wall of the limiting hole. The transition block, the valve body and the push rod are all treated to be methanol resistant.

[0021] Beneficial effects of this invention:

[0022] This invention provides a methanol injector. The methanol injector includes: an injector body, a solenoid valve, a first elastic element, an armature rod, a ball, a throttling plate, a plunger, a nozzle, and a second elastic element. The solenoid valve is disposed at one end of the injector body. The throttling plate is disposed within the injector body and has a first inverted conical hole and a second inverted conical hole that are interconnected. The ball is disposed in the first inverted conical hole and is capable of opening or closing the second inverted conical hole. The armature rod is slidably disposed within the injector body, with one end of the armature rod abutting against the ball. The first elastic element is configured to always have a tendency to drive the armature rod to push the ball to close the second inverted conical hole. The plunger is slidably disposed within the injector body, and a first receiving cavity is provided between one end of the plunger and the throttling plate. The first receiving cavity is connected to the second inverted conical hole. The injector body has an inverted conical orifice and an inlet and an outlet. The inlet communicates with the first receiving cavity, and the outlet communicates with the first inverted conical orifice. The alcohol spray nozzle includes an alcohol spray nozzle cap and a needle valve. One end of the alcohol spray nozzle cap is connected to the other end of the injector body, and the other end of the alcohol spray nozzle cap is provided with an alcohol spray port. The needle valve is slidably disposed in the alcohol spray nozzle cap to open or close the alcohol spray port. The second elastic element is configured to always have the tendency to drive the needle valve to close the alcohol spray port. The alcohol spray nozzle cap is provided with a second receiving cavity, which communicates with the inlet. The needle valve is provided with a pressure-bearing surface, and methanol can act on the pressure-bearing surface to open the alcohol spray port. The needle valve, plunger, second elastic element, armature rod, inner wall of the inlet, and inner wall of the outlet are all treated with alcohol resistance. Compared to existing technologies, this methanol injector, by setting up a throttling plate and a second inverted conical orifice, can achieve multi-stage pressure reduction, thereby reducing the pressure difference of fluid flowing into the first inverted conical orifice. This reduces the risk of methanol vaporization corrosion, delays cavitation damage to the sealing surface and surrounding area caused by methanol vaporization, and extends the service life of the injector. At the same time, it simplifies the system structure by relying on only methanol as a medium. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of the methanol injector provided in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A magnified view of part A in the image.

[0026] In the picture:

[0027] 1. Electromagnet; 2. First elastic element; 3. Locking cap; 4. Adjusting element; 5. Ball seat; 6. Armature rod; 7. Armature; 8. Third elastic element; 9. Valve seat; 10. Throttling plate; 11. Ball; 12. Injector body; 13. Gasket; 14. Push rod; 15. Second elastic element; 16. Transition block; 17. Injector nozzle cap; 18. Valve body; 19. Needle valve; 20. Plunger; 21. Inlet; 22. Outlet; 23. First receiving cavity; 24. Injector port. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0032] like Figure 1 and Figure 2As shown, the present invention provides a methanol injector. The methanol injector includes: an injector body 12, a solenoid valve, a first elastic element 2, an armature rod 6, a ball 11, a throttling plate 10, a plunger 20, an alcohol nozzle, and a second elastic element 15.

[0033] Specifically, a solenoid valve is disposed at one end of the injector body 12, a throttle plate 10 is disposed inside the injector body 12, the throttle plate 10 is provided with a first inverted conical hole and a second inverted conical hole that are interconnected, a ball 11 is disposed in the first inverted conical hole and can open or close the second inverted conical hole, an armature rod 6 is slidably disposed inside the injector body 12, and one end of the armature rod 6 abuts against the ball 11, the first elastic member 2 is configured to always have the tendency to drive the armature rod 6 to push the ball 11 to close the second inverted conical hole, a plunger 20 is slidably disposed in the injector body 12, a first receiving cavity 23 is provided between one end of the plunger 20 and the throttle plate 10, the first receiving cavity 23 is connected to the second inverted conical hole, the injector body 12 is provided with an inlet 21 and an outlet 22, the inlet 21 and the first receiving cavity 23 are connected to the second inverted conical hole, and the injector body 12 is provided with an inlet 21 and an outlet 22. The cavity 23 is connected, and the outlet 22 is connected to the first inverted conical hole. The alcohol spray nozzle includes an alcohol spray nozzle cap 17 and a needle valve 19. One end of the alcohol spray nozzle cap 17 is connected to the other end of the injector body 12. The other end of the alcohol spray nozzle cap 17 is provided with an alcohol spray port 24. The needle valve 19 is slidably disposed in the alcohol spray nozzle cap 17 to open or close the alcohol spray port 24. The second elastic element 15 is configured to always have the tendency to drive the needle valve 19 to close the alcohol spray port 24. The alcohol spray nozzle cap 17 is provided with a second receiving cavity, which is connected to the inlet 21. The needle valve 19 is provided with a pressure bearing surface, and methanol can act on the pressure bearing surface to open the alcohol spray port 24. The needle valve 19, the plunger 20, the second elastic element 15, the armature rod 6, the inner wall of the inlet 21 and the inner wall of the outlet 22 are all treated with alcohol resistance. Compared to existing technologies, this methanol injector, by incorporating a throttling plate 10 and a second inverted conical orifice, achieves multi-stage pressure reduction, thereby lowering the pressure differential of the fluid flowing into the first inverted conical orifice. This reduces the risk of methanol vaporization corrosion, delays cavitation damage to the sealing surface and surrounding area caused by methanol vaporization, and extends the injector's service life. Furthermore, by relying solely on methanol as the medium, the system structure is simplified. Additionally, both the first elastic element 2 and the second elastic element 15 are compression springs.

[0034] Optionally, the cross-sectional area of ​​the first inverted conical orifice is larger than that of the second inverted conical orifice. Specifically, the opening length of the first inverted conical orifice is much greater than that of the second inverted conical orifice. The smaller opening of the first inverted conical orifice connects to the larger opening of the second inverted conical orifice, which allows methanol to flow out rapidly when the sphere 11 opens the second inverted conical orifice, thereby reducing pressure and completing the injection of methanol from the injection port 24, and improving the response speed of the injector.

[0035] Optionally, the solenoid valve includes an electromagnet 1, a locking cap 3, an armature 7, and an adjusting member 4. The two ends of the locking cap 3 are respectively connected to the injector body 12 and the electromagnet 1 to improve the stability of the connection between the injector body 12 and the electromagnet 1. The armature 7 is disposed between the throttle plate 10 and the electromagnet 1. The electromagnet 1 is provided with a sliding groove. One end of the armature rod 6 is slidably disposed in the sliding groove, and the other end of the armature rod 6 passes through the armature 7 and abuts against the ball 11. The adjusting member 4 is disposed between the electromagnet 1 and the injector body 12 to adjust the distance between the injector body 12 and the electromagnet 1, thereby controlling the moving distance of the armature rod 6.

[0036] Optionally, the methanol injector also includes a valve seat 9, which is disposed between the armature 7 and the throttle plate 10. The other end of the armature rod 6 passes through the valve seat 9 and abuts against the ball 11. Specifically, the valve seat 9 is provided with a through hole, and the armature rod 6 can slide along the wall of the through hole, thereby improving the movement accuracy of the armature rod 6.

[0037] Optionally, the methanol injector also includes a third elastic element 8, which is configured to always tend to drive the valve seat 9 toward the throttle plate 10. Specifically, the third elastic element 8 is a compression spring, one end of which abuts against the electromagnet 1, and the other end of which is sleeved on the valve seat 9 and abuts against the stepped surface of the valve seat 9, so that the valve seat 9 presses against the throttle plate 10.

[0038] Optionally, the alcohol spray nozzle also includes a valve body 18, which is fixed inside the alcohol spray nozzle cap 17. The valve body 18 is provided with an alcohol spray port 24, and a needle valve 19 is slidably disposed on the valve body 18. The needle valve 19 slides relative to the valve body 18 to realize the opening and closing of the alcohol spray port 24.

[0039] Optionally, the nozzle also includes a transition block 16, which is disposed between the injector body 12 and the valve body 18. Specifically, the transition block 16 is provided with a passage, the two ends of which are respectively connected to the inlet 21 and the second receiving cavity.

[0040] Optionally, the nozzle also includes a push rod 14, and the transition block 16 is provided with a limiting hole. One end of the push rod 14 abuts against the plunger 20, and the other end of the push rod 14 is inserted into the limiting hole and abuts against the needle valve 19. The end face of the other end of the push rod 14 can abut against the wall of the limiting hole. Specifically, the push rod 14 is inverted T-shaped. One end of the second elastic member 15 abuts against the injector body 12, and the other end of the second elastic member 15 is sleeved on the push rod 14 and abuts against the stepped surface of the push rod 14. The wall of the limiting hole is provided with a limiting block protruding inward. The push rod 14 can abut against the limiting block to prevent the needle valve 19 from being excessively squeezed.

[0041] Furthermore, the methanol injector also includes a gasket 13, which is disposed between the second elastic member 15 and the injector body 12. The gasket 13 is treated to be alcohol resistant. By changing the height of the gasket 13, the compression of the second elastic member 15 can be changed, thereby adjusting the elastic force of the second elastic member 15.

[0042] Optionally, the methanol injector also includes a ball seat 5, which is disposed between the armature rod 6 and the ball 11. The ball seat 5 is provided with a groove, and part of the ball seat 5 is embedded in the groove, which can improve the stability of the ball 11 and prevent the ball 11 from rolling.

[0043] Optionally, the ball seat 5, ball 11, and throttle plate 10 are all made of ceramic. Specifically, the ball seat 5, ball 11, and throttle plate 10 are all made of methanol-resistant ceramic materials. The sealing surfaces and alcohol-contacting parts of the needle valve 19, plunger 20, second elastic element 15, armature rod 6, inner wall of inlet 21, inner wall of outlet 22, transition block 16, valve body 18, and push rod 14 are all treated to resist methanol corrosion, which can prevent cavitation damage and improve the service life of the injector.

[0044] The operating principle of the methanol injector provided by this invention is as follows:

[0045] High-pressure methanol flows from inlet 21 into the first receiving chamber 23 and the second receiving chamber. When no current flows through the solenoid valve, the ball 11 and the ball seat 5 are seated, the second inverted conical orifice is closed, the pressure in the first receiving chamber 23 is the same as the pressure in inlet 21, and the same pressure also exists in the second receiving chamber. At this time, the sum of the force applied to the cross-section of the plunger 20 and the force applied to the second elastic element 15 is greater than the hydraulic pressure acting on the pressure bearing surface of the needle valve 19, the needle valve 19 is closed, and the injector is in the closed state.

[0046] When the solenoid valve is energized, and when the force of the electromagnet 1 is greater than the force of the first elastic element 2, the ball 11 and the ball seat 5 open, and the second inverted conical orifice opens. In a very short time, the increased suction current becomes a small solenoid valve holding current. As the second inverted conical orifice opens, methanol flows from the first receiving cavity 23 into the first inverted conical orifice and flows back to the outlet 22 through the methanol return channel, causing the pressure in the first receiving cavity 23 to drop. Thus, the pressure in the first receiving cavity 23 is less than the hydraulic pressure acting on the pressure bearing surface of the needle valve 19. When the hydraulic pressure acting on the pressure bearing surface of the needle valve 19 overcomes the force of the second elastic element 15, the plunger 20 moves upward, thereby raising the needle valve 19, opening the methanol injection port 24, and starting to inject methanol.

[0047] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A methanol injector, characterized in that, include: The injector body (12), solenoid valve, first elastic element (2), armature rod (6), ball (11), throttle plate (10), plunger (20), alcohol nozzle, and second elastic element (15) are configured. The solenoid valve is located at one end of the injector body (12). The throttle plate (10) is located inside the injector body (12) and has a first inverted conical hole and a second inverted conical hole that are interconnected. The ball (11) is located in the first inverted conical hole and can open or close the second inverted conical hole. The armature rod (6) is also included. The first elastic element (2) is slidably disposed within the injector body (12), with one end of the armature rod (6) abutting against the ball (11). The first elastic element (2) is configured to always have the tendency to drive the armature rod (6) to push the ball (11) to close the second inverted conical orifice. The plunger (20) is slidably disposed within the injector body (12), and a first receiving cavity (23) is provided between one end of the plunger (20) and the throttle plate (10). The first receiving cavity (23) communicates with the second inverted conical orifice. The injector body (12) is provided with... It has an inlet (21) and an outlet (22). The inlet (21) communicates with the first receiving cavity (23), and the outlet (22) communicates with the first inverted conical hole. The spray nozzle includes a spray nozzle cap (17) and a needle valve (19). One end of the spray nozzle cap (17) is connected to the other end of the injector body (12), and the other end of the spray nozzle cap (17) is provided with a spray port (24). The needle valve (19) is slidably disposed in the spray nozzle cap (17) to open or close the spray port (24). The second elastic... The component (15) is configured to always have the tendency to drive the needle valve (19) to close the alcohol injection port (24). The alcohol injection nozzle cap (17) is provided with a second receiving cavity, which is connected to the inlet (21). The needle valve (19) is provided with a pressure-bearing surface, and methanol can act on the pressure-bearing surface to open the alcohol injection port (24). The needle valve (19), the plunger (20), the second elastic element (15), the armature rod (6), the inner wall of the inlet (21), and the inner wall of the outlet (22) are all treated with alcohol resistance. The cross-sectional area of ​​the first inverted conical hole is larger than that of the second inverted conical hole, and the small opening of the first inverted conical hole is connected to the large opening of the second inverted conical hole.

2. A methanol injector according to claim 1, characterized in that, The methanol injector also includes a ball seat (5), which is disposed between the armature rod (6) and the ball (11). The ball seat (5) is provided with a groove, and part of the ball (11) is embedded in the groove.

3. A methanol injector according to claim 2, characterized in that, The ball seat (5), the ball (11) and the throttling plate (10) are all ceramic components.

4. A methanol injector according to claim 1, characterized in that, The solenoid valve includes an electromagnet (1), a locking cap (3), an armature (7), and an adjusting member (4). The two ends of the locking cap (3) are respectively connected to the injector body (12) and the electromagnet (1). The armature (7) is disposed between the throttle plate (10) and the electromagnet (1). The electromagnet (1) is provided with a sliding groove. One end of the armature rod (6) is slidably disposed in the sliding groove. The other end of the armature rod (6) passes through the armature (7) and abuts against the ball (11). The adjusting member (4) is disposed between the electromagnet (1) and the injector body (12).

5. A methanol injector according to claim 4, characterized in that, The methanol injector also includes a valve seat (9), which is disposed between the armature (7) and the throttle plate (10), and the other end of the armature rod (6) passes through the valve seat (9) and abuts against the ball (11).

6. A methanol injector according to claim 5, characterized in that, The methanol injector also includes a third elastic element (8) configured to always have a tendency to drive the valve seat (9) toward the throttle plate (10).

7. A methanol injector according to claim 1, characterized in that, The alcohol spray nozzle also includes a valve body (18), which is fixed inside the alcohol spray nozzle cap (17). The valve body (18) is provided with the alcohol spray port (24), and the needle valve (19) is slidably disposed on the valve body (18).

8. A methanol injector according to claim 7, characterized in that, The alcohol spray nozzle also includes a transition block (16), which is disposed between the injector body (12) and the valve body (18).

9. A methanol injector according to claim 8, characterized in that, The alcohol spray nozzle also includes a push rod (14), the transition block (16) is provided with a limiting hole, one end of the push rod (14) abuts against the plunger (20), the other end of the push rod (14) is inserted into the limiting hole and abuts against the needle valve (19), and the end face of the other end of the push rod (14) can abut against the hole wall of the limiting hole. The transition block (16), the valve body (18) and the push rod (14) are all treated to be alcohol resistant.

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