Methanol ejector

Abstract

The invention relates to the technical field of internal combustion engines, in particular to a methanol ejector. The throttling plate is arranged in the ejector body and provided with a first inverted-cone-shaped hole and a second inverted-cone-shaped hole which are communicated with each other, the ball is arranged in the first inverted-cone-shaped hole and can open or close the second inverted-cone-shaped hole, and a first containing cavity is formed between one end of the plunger and the throttling plate and communicated with the second inverted-cone-shaped hole. The inlet is communicated with the first containing cavity, the outlet is communicated with the first inverted-cone-shaped hole, one end of the alcohol spraying nozzle tightening cap is connected to the other end of the ejector body, the needle valve is arranged in the alcohol spraying nozzle tightening cap in a sliding mode so as to open or close the alcohol spraying opening, the second containing cavity is communicated with the inlet, and methyl alcohol acts on the pressure bearing face so as to open the alcohol spraying opening. The methanol ejector is provided with the throttling plate and the second inverted-cone-shaped hole, multi-stage pressure reduction is achieved, and therefore the pressure difference of fluid flowing into the first inverted-cone-shaped hole is reduced, cavitation damage, caused by methanol gasification, to the sealing face and the area nearby the sealing face is delayed, and the service life of the methanol ejector is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of internal combustion engines, and in particular to a methanol injector. BACKGROUND

[0002] Methanol is considered 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 emission pollution.

[0003] However, due to the corrosive, low boiling point, and easy vaporization characteristics of methanol, when the injector sprays methanol, the vaporization of methanol can cause the sealing surface of the injector and the area near the sealing surface to be subjected to cavitation, reducing the service life of the injector.

[0004] The patent document with application publication number CN202410340793.5 discloses a methanol injector that improves the structure of the valve body sealing surface or the needle valve sealing surface and sets a throttle hole at the outlet of the oil return path to reduce the pressure drop before and after the needle valve sealing surface and the oil return valve seat sealing surface, improve the cavitation problem of the oil nozzle and the oil return valve, and reduce the cavitation problem of the needle valve and the needle valve body by using a stepped orifice structure, while improving the spray performance. This injector improves the impact of cavitation during methanol injection, but cannot solve the cavitation problem when the control valve is depressurized.

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

[0006] The patent document with application publication number CN202211695805.3 discloses a low-carbon fuel injector that allows low-carbon fuel to achieve a thermal efficiency of about 50% similar to diesel on an internal combustion engine and improves the service life of the injector. The injector 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 complex system, high cost, and mutual penetration of the two media affecting the control function and combustion.

[0008] Therefore, there is an urgent need for a methanol injector to solve the above technical problems. SUMMARY

[0009] The methanol injector can simplify the structure, reduce the risk of methanol gasification corrosion, delay the damage of the sealing surface and the area near the sealing surface caused by methanol gasification, and prolong the service life of the injector.

[0010] To achieve the above object, the present application adopts the following technical solutions:

[0011] A methanol injector, comprising: an injector body, an electromagnetic valve, a first elastic member, an armature rod, a ball, a throttle plate, a plunger, a methanol nozzle and a second elastic member, the electromagnetic valve is arranged at one end of the injector body, the throttle plate is arranged in the injector body, the throttle plate is provided with a first inverted cone hole and a second inverted cone hole which are communicated with each other, the ball is arranged in the first inverted cone hole and can open or close the second inverted cone hole, the armature rod is slidingly arranged in the injector body, and one end of the armature rod abuts against the ball, the first elastic member is configured to always have a tendency to drive the armature rod to push the ball to close the second inverted cone hole, the plunger is slidingly arranged in the injector body, a first containing cavity is arranged between one end of the plunger and the throttle plate, the first containing cavity is communicated with the second inverted cone hole, the injector body is provided with an inlet and an outlet, the inlet is communicated with the first containing cavity, and the outlet is communicated with the first inverted cone hole, the methanol nozzle comprises a methanol nozzle cap and a needle valve, one end of the methanol nozzle cap is connected to the other end of the injector body, the other end of the methanol nozzle cap is provided with a methanol outlet, the needle valve is slidingly arranged in the methanol nozzle cap to open or close the methanol outlet, the second elastic member is configured to always have a tendency to drive the needle valve to close the methanol outlet, a second containing cavity is arranged in the methanol nozzle cap, the second containing cavity is communicated 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 methanol outlet, the needle valve, the plunger, the second elastic member, the armature rod, the inner wall of the inlet and the inner wall of the outlet are all subjected to alcohol-resistant treatment.

[0012] As a preferred technical solution of the above-mentioned methanol injector, the methanol injector further comprises a ball seat, the ball seat is arranged between the armature rod and the ball, the ball seat is provided with a groove, and part of the ball seat is embedded in the groove.

[0013] As a preferred technical solution of the above-mentioned methanol injector, the ball seat, the ball and the throttle plate are all ceramic parts.

[0014] As a preferred technical solution of the above-mentioned methanol injector, the cross-sectional area of the first inverted cone hole is larger than that of the second inverted cone hole.

[0015] As a preferred technical scheme of the above-mentioned methanol injector, the electromagnetic valve comprises an electromagnet, a locking cap, an armature and an adjusting piece, two ends of the locking cap are connected to the injector body and the electromagnet respectively, the armature is arranged between the throttle plate and the electromagnet, the electromagnet is provided with a sliding groove, one end of the armature rod is slidingly arranged in the sliding groove, the other end of the armature rod penetrates through the armature and abuts against the ball, and the adjusting piece is arranged between the electromagnet and the injector body.

[0016] As a preferred technical scheme of the above-mentioned methanol injector, the methanol injector further comprises a valve seat, the valve seat is arranged between the armature and the throttle plate, and the other end of the armature rod penetrates through the valve seat and abuts against the ball.

[0017] As a preferred technical scheme of the above-mentioned methanol injector, the methanol injector further comprises a third elastic piece, the third elastic piece is configured to always have a tendency to drive the valve seat to move close to the throttle plate.

[0018] As a preferred technical scheme of the above-mentioned methanol injector, the methanol nozzle further comprises a valve body, the valve body is fixed in the methanol nozzle cap, the valve body is provided with the methanol outlet, and the needle valve is slidingly arranged in the valve body.

[0019] As a preferred technical scheme of the above-mentioned methanol injector, the methanol nozzle further comprises a transition block, the transition block is arranged between the injector body and the valve body.

[0020] As a preferred technical scheme of the above-mentioned methanol injector, the methanol nozzle further comprises a top rod, the transition block is provided with a limiting hole, one end of the top rod abuts against the plunger, the other end of the top rod is inserted into the limiting hole and abuts against the needle valve, an end face of the other end of the top rod can abut against a hole wall of the limiting hole, and the transition block, the valve body and the top rod are all subjected to alcohol-resistant treatment.

[0021] The present application has the following beneficial effects:

[0022] The present application provides a kind of methanol injector.The methanol injector includes injector body, solenoid valve, first elastic member, armature rod, ball, throttle plate, plunger, alcohol nozzle and second elastic member, solenoid valve is arranged at one end of injector body, throttle plate is arranged in the injector body, throttle plate is provided with first inverted cone hole and second inverted cone hole that are communicated with each other, ball is arranged in first inverted cone hole, and second inverted cone hole can be opened or closed, armature rod is slidably arranged in the injector body, and one end of armature rod abuts with ball, first elastic member is configured to always have the tendency to drive armature rod to push ball to close second inverted cone hole, plunger is slidably arranged in the injector body, and first containing cavity is arranged between one end of plunger and throttle plate, first containing cavity is communicated with second inverted cone hole, injector body is provided with inlet and outlet, inlet is communicated with first containing cavity, and outlet is communicated with first inverted cone hole, alcohol nozzle includes alcohol nozzle cap and needle valve, one end of alcohol nozzle cap is connected to the other end of injector body, alcohol nozzle opening is arranged at the other end of alcohol nozzle cap, needle valve is slidably arranged in alcohol nozzle cap to open or close alcohol nozzle opening, second elastic member is configured to always have the tendency to drive needle valve to close alcohol nozzle opening, second containing cavity is arranged in alcohol nozzle cap, and second containing cavity is communicated with inlet, needle valve is provided with pressure bearing surface, and methanol can act on pressure bearing surface to open alcohol nozzle opening, needle valve, plunger, second elastic member, armature rod, inner wall of inlet and inner wall of outlet are all alcohol-resistant.Compared with prior art, the methanol injector can realize multi-stage pressure reduction by arranging throttle plate and second inverted cone hole, thereby reducing the pressure difference of fluid flowing into first inverted cone hole, reducing the risk of methanol gasification corrosion, delaying the damage of sealing surface and the area near sealing surface caused by methanol gasification, and prolonging the service life of the injector;At the same time, only one kind of medium, methanol, is used to simplify the system structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the contents of the embodiments of the present application and these drawings.

[0024] Figure 1 It is the structure sectional view of the methanol injector provided by the embodiments of the present application.

[0025] Figure 2 For Figure 1 The local enlarged view of A in the figure.

[0026] In the figure:

[0027] 1 electromagnet; 2 first elastic member; 3 locking cap; 4 adjusting member; 5 ball seat; 6 armature rod; 7 armature; 8 third elastic member; 9 valve seat; 10 throttle plate; 11 ball; 12 injector body; 13 gasket; 14 ejector rod; 15 second elastic member; 16 transition block; 17 alcohol injection nozzle locking cap; 18 valve body; 19 needle valve; 20 plunger; 21 inlet; 22 outlet; 23 first accommodating cavity; 24 alcohol injection port. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely exemplary of the application and that the application is not limited to such exemplary embodiments. It should also be noted that for the purpose of clarity, not all of the components of the structures are shown in the drawings.

[0029] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] As Figure 1 and Figure 2As shown, the present application provides a methanol injector. The methanol injector comprises an injector body 12, a solenoid valve, a first elastic member 2, an armature rod 6, a ball 11, a throttle plate 10, a plunger 20, a methanol nozzle and a second elastic member 15.

[0033] Specifically, the solenoid valve is arranged at one end of the injector body 12, the throttle plate 10 is arranged in the injector body 12, the throttle plate 10 is provided with a first inverted conical hole and a second inverted conical hole which are in communication with each other, the ball 11 is arranged in the first inverted conical hole and can open or close the second inverted conical hole, the armature rod 6 is slidingly arranged in 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 a tendency to drive the armature rod 6 to push the ball 11 to close the second inverted conical hole, the plunger 20 is slidingly arranged in the injector body 12, and a first containing cavity 23 is arranged between one end of the plunger 20 and the throttle plate 10, the first containing cavity 23 is communicated with the second inverted conical hole, the injector body 12 is provided with an inlet 21 and an outlet 22, the inlet 21 is communicated with the first containing cavity 23, and the outlet 22 is communicated with the first inverted conical hole, the methanol nozzle comprises a methanol nozzle cap 17 and a needle valve 19, one end of the methanol nozzle cap 17 is connected to the other end of the injector body 12, the other end of the methanol nozzle cap 17 is provided with a methanol outlet 24, the needle valve 19 is slidingly arranged in the methanol nozzle cap 17 to open or close the methanol outlet 24, the second elastic member 15 is configured to always have a tendency to drive the needle valve 19 to close the methanol outlet 24, a second containing cavity is arranged in the methanol nozzle cap 17, the second containing cavity is communicated with 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 methanol outlet 24, the needle valve 19, the plunger 20, the second elastic member 15, the armature rod 6, the inner wall of the inlet 21 and the inner wall of the outlet 22 are all subjected to alcohol-resistant treatment. Compared with the prior art, the methanol injector can realize multi-stage pressure reduction by arranging the throttle plate 10 and the second inverted conical hole, thereby reducing the pressure difference of the fluid flowing into the first inverted conical hole, reducing the risk of methanol gasification corrosion, delaying the cavitation damage of the sealing surface and the area near the sealing surface caused by methanol gasification, and prolonging the service life of the injector. At the same time, only one kind of medium, methanol, is used to simplify the system structure. Further, the first elastic member 2 and the second elastic member 15 are both compression springs.

[0034] Optionally, the cross-sectional area of the first inverted conical hole is greater than the cross-sectional area of the second inverted conical hole. Specifically, the opening length of the first inverted conical hole is much greater than the opening length of the second inverted conical hole, the small opening of the first inverted conical hole is communicated with the large opening of the second inverted conical hole, and methanol can flow out quickly when the ball 11 opens the second inverted conical hole, thereby realizing pressure reduction, completing the injection of methanol from the methanol outlet 24, and improving the response speed of the injector.

[0035] Optionally, the electromagnetic valve comprises an electromagnet 1, a locking cap 3, an armature 7 and an adjusting piece 4, two ends of the locking cap 3 are connected to the injector body 12 and the electromagnet 1 respectively, the stability of the connection between the injector body 12 and the electromagnet 1 is improved, the armature 7 is arranged 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 slidingly arranged 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 piece 4 is arranged between the electromagnet 1 and the injector body 12, the distance between the injector body 12 and the electromagnet 1 can be adjusted, and then the moving distance of the armature rod 6 is controlled.

[0036] Optionally, the methanol injector further comprises a valve seat 9, the valve seat 9 is arranged 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. Specifically, the valve seat 9 is provided with a through hole, the armature rod 6 can slide along the hole wall of the through hole, and the moving precision of the armature rod 6 is improved.

[0037] Optionally, the methanol injector further comprises a third elastic piece 8, the third elastic piece 8 is configured to always have a tendency to drive the valve seat 9 to move close to the throttle plate 10. Specifically, the third elastic piece 8 is a compression spring, one end of the third elastic piece 8 abuts against the electromagnet 1, and the other end of the third elastic piece 8 is sleeved on the valve seat 9 and abuts against the stepped surface of the valve seat 9, so that the valve seat 9 is pressed against the throttle plate 10.

[0038] Optionally, the alcohol injection nozzle further comprises a valve body 18, the valve body 18 is fixed in the alcohol injection nozzle cap 17, the valve body 18 is provided with an alcohol injection port 24, and the needle valve 19 is slidingly arranged in the valve body 18, and the needle valve 19 slides relative to the valve body 18 to open and close the alcohol injection port 24.

[0039] Optionally, the alcohol injection nozzle further comprises a transition block 16, the transition block 16 is arranged between the injector body 12 and the valve body 18. Specifically, the transition block 16 is provided with a passage, and two ends of the passage are communicated with the inlet 21 and the second accommodating cavity respectively.

[0040] Optionally, the alcohol injection nozzle further comprises a top rod 14, the transition block 16 is provided with a limiting hole, one end of the top rod 14 abuts against the plunger 20, the other end of the top 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 top rod 14 can abut against the hole wall of the limiting hole. Specifically, the top rod 14 is inverted T-shaped, one end of the second elastic piece 15 abuts against the injector body 12, the other end of the second elastic piece 15 is sleeved on the top rod 14 and abuts against the stepped surface of the top rod 14, the hole wall of the limiting hole is inwardly provided with a limiting block, the top rod 14 can abut against the limiting block, and the needle valve 19 is prevented from being excessively extruded.

[0041] Further, the methanol injector further comprises a gasket 13 arranged between the second elastic member 15 and the injector body 12, and the gasket 13 is alcohol-resistant, and the compression amount of the second elastic member 15 can be changed by changing the height of the gasket 13, and then the elastic force of the second elastic member 15 is adjusted.

[0042] Optionally, the methanol injector further comprises a ball seat 5 arranged between the armature rod 6 and the ball 11, and the ball seat 5 is provided with a groove, and part of the ball seat 5 is embedded in the groove, so that the stability of the ball 11 is improved, and the ball 11 is prevented from rolling.

[0043] Optionally, the ball seat 5, the ball 11 and the throttle plate 10 are all ceramic parts. Specifically, the ball seat 5, the ball 11 and the throttle plate 10 are all made of ceramic materials resistant to methanol corrosion, and the sealing surfaces of alcohol-related components such as the needle valve 19, the plunger 20, the second elastic member 15, the armature rod 6, the inner wall of the inlet 21, the inner wall of the outlet 22, the transition block 16, the valve body 18 and the top rod 14, and alcohol-related parts are subjected to methanol corrosion-resistant treatment, so that the cavitation damage is prevented, and the service life of the injector is improved.

[0044] The use principle of the methanol injector provided by the application is as follows:

[0045] High-pressure methanol flows into the first containing cavity 23 and the second containing cavity from the inlet 21, when no current flows through the electromagnetic valve, the ball 11 and the ball seat 5 are seated, the second inverted conical hole is closed, the pressure in the first containing cavity 23 is the same as the pressure of the inlet 21, and the same pressure also exists in the second containing cavity, at this time, the sum of the force acting on the cross section of the plunger 20 and the force of the second elastic member 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 a closed state.

[0046] When the electromagnetic valve is powered on, and when the force of the electromagnet 1 is greater than the force of the first elastic member 2, the ball 11 and the ball seat 5 are opened, and the second inverted conical hole is opened, in a very short time, the rising magnetizing current becomes a smaller electromagnetic valve holding current, with the opening of the second inverted conical hole, methanol flows from the first containing cavity 23 into the first inverted conical hole, and flows back to the outlet 22 through the alcohol return channel, so that the pressure in the first containing cavity 23 is reduced, and then the pressure of the first containing 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 member 15, the plunger 20 moves upward, and then the needle valve 19 is lifted, the methanol injection port 24 is opened, and the methanol injection is started.

[0047] In addition, the above merely describes the preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, reconfigurations and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the 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.

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) has a groove, and part of the ball seat (5) 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 cross-sectional area of ​​the first inverted conical hole is greater than the cross-sectional area of ​​the second inverted conical hole.

5. 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).

6. A methanol injector according to claim 5, 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).

7. A methanol injector according to claim 6, 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).

8. 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).

9. A methanol injector according to claim 8, 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).

10. A methanol injector according to claim 9, 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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