Methanol fuel injector assembly

Abstract

The utility model belongs to the technical field of ejectors, and particularly discloses a methanol fuel ejector assembly which comprises an ejector body provided with an inner cavity. The sealing assembly is clamped in the inner cavity; the control valve seat is arranged in the inner cavity, one end penetrates through the sealing assembly to the position above the pressure chamber, and the other end is connected with the fixing nut valve assembly. According to the structure, methanol cannot leak from a gap between the control valve seat and the pressure chamber and a gap between the control valve seat and the inner cavity, so that the control valve seat is prevented from being corroded by methanol, and the service life of the ejector is prolonged. According to the utility model, engine oil is used as control liquid, so that an oil film is formed between the armature shaft and the inner wall of the armature seat, and an oil film is formed between the needle valve and the inner wall of the control valve seat, the lubricity and durability of each sliding part are improved, the abrasion of each sliding part is reduced, and the service life of the ejector is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of injector, concretely relates to a kind of injector assembly of methanol fuel. BACKGROUND

[0002] Greenhouse gas emission regulations are strongly promoting the green and low-carbon transformation of ship power, automobile power, engineering machinery and other fields, and this trend has become irreversible. Under this background, renewable green clean energy, as an ideal substitute for traditional fossil fuels, is widely regarded as an effective and practically feasible way to achieve the goal of greenhouse gas emission reduction. As a potential power fuel, renewable low-carbon energy such as methanol, ammonia and hydrogen has been widely used and practiced in many fields.

[0003] Methanol is quite similar to fossil fuels in its physical and chemical properties, especially its high energy density and liquid state at room temperature, which makes methanol fuel highly compatible with fossil fuels in storage, transportation, refueling and use.

[0004] However, under the current technical conditions, methanol fuel injectors generally use low-pressure intake port injection method, which often leads to poor atomization effect, thereby affecting combustion efficiency and emission performance. In order to improve this situation, a common strategy is to increase injection pressure to enhance atomization effect. However, as a volatile and corrosive liquid, methanol's volatility and corrosiveness will significantly increase in high-pressure and high-temperature extreme environments, which poses a considerable challenge to the design and use of injectors.

[0005] In particular, the control valve seat of the injector is directly exposed to the high-temperature and high-pressure environment of the engine combustion chamber and frequently subjected to high-frequency mechanical impact forces. Under such extremely harsh working conditions, the control valve seat is prone to corrosion and wear and tear. Once these problems occur, it will directly lead to the failure of the sealing performance of the control valve seat of the injector, thereby seriously affecting the stability and reliability of the injector. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a kind of injector assembly of methanol fuel, control valve seat avoids to be corroded by methanol and sealing failure, prolongs the service life of injector.

[0007] The utility model aims at realizing by such technical scheme, specifically provides a kind of injector assembly of methanol fuel, including:

[0008] Injector body, is equipped with inner chamber;

[0009] Sealing assembly, is clamped in inner chamber;

[0010] The control valve seat is arranged in the inner cavity and has one end penetrating through the sealing assembly to above the pressure chamber and the other end being connected with the fixed nut valve assembly.

[0011] Preferably, the sealing assembly comprises a methanol-resistant sealing ring and a sealing gasket, both of which are clamped in the inner cavity, and the sealing gasket is arranged above the methanol-resistant sealing ring.

[0012] Preferably, the injector body further comprises an electromagnetic valve assembly, the fixed nut valve assembly comprises a fixed nut, an armature over-travel adjustment pad, an armature shaft, an armature seat and a switch ceramic ball, the fixed nut is provided with a stepped through hole penetrating through the axial direction of the fixed nut, the armature over-travel adjustment pad is arranged on the stepped surface of the stepped through hole, the armature seat is arranged in the stepped through hole and has one end being in contact with the electromagnetic valve assembly and the other end being in contact with the armature over-travel adjustment pad; the armature seat is provided with a sliding hole coaxial with the stepped through hole, the armature shaft is slidingly arranged in the stepped through hole and the sliding hole, the armature shaft has one end face being provided with a spherical groove matched with the switch ceramic ball and the other end being connected with the electromagnetic valve assembly, and the control valve seat is provided with a tapered hole matched with the switch ceramic ball.

[0013] Preferably, the control valve seat is provided with a control chamber, and the control chamber is in communication with the oil return metering hole and the oil inlet metering hole respectively.

[0014] Preferably, the diameter of the oil inlet metering hole is smaller than the diameter of the oil return metering hole.

[0015] Preferably, a first oil inlet channel is arranged between the oil inlet metering hole and the control chamber, and the first oil inlet channel is provided with an oil inlet filter element.

[0016] Preferably, the outer side surface of the first oil inlet channel is provided with external threads, and the injector body is provided with internal threads matched with the external threads.

[0017] Preferably, the control liquid in the control chamber is engine oil, and the entering pressure of the engine oil is greater than the pressure of the methanol entering the injector body.

[0018] Preferably, the injector body further comprises a needle valve assembly, and the needle valve assembly comprises a needle valve, an injector pressure regulating spring, a pressure adjustment pad, a spring seat and an open gasket; the upper end of the needle valve is slidingly arranged in the control valve seat, the outer side surface of the needle valve is provided with a groove, and the open gasket is arranged in the groove; the spring seat is sleeved into the needle valve and is in contact with the upper end surface of the open gasket; the injector pressure regulating spring is sleeved into the needle valve, one end of the injector pressure regulating spring is in contact with the upper end surface of the spring seat, and the other end of the injector pressure regulating spring is in abutment with the inner wall of the control valve seat.

[0019] Preferably, a plurality of first ring grooves are arranged at intervals on the inner side surface of the control valve seat.

[0020] Preferably, a second ring groove is arranged on the inner side surface of the control valve seat, and the second ring groove is in communication with the oil inlet metering hole.

[0021] Thanks to the above technical scheme, the present application has the following advantages:

[0022] The injector assembly of the methanol fuel is provided with a sealing assembly on the outer surface of the control valve seat, so that the methanol cannot leak from the gap between the control valve seat and the pressure chamber and the gap between the control valve seat and the inner cavity, the control valve seat avoids corrosion caused by the methanol to cause sealing failure and other problems, and the service life of the injector is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application, the drawings required in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0024] Figure 1 It is a structural schematic view of the injector assembly of the methanol fuel of the present application;

[0025] Figure 2 It is a structural schematic view of the needle valve assembly;

[0026] Figure 3 It is an enlarged schematic view of A;

[0027] Figure 4 It is an enlarged schematic view of B;

[0028] Figure 5 It is a schematic view of the control valve seat.

[0029] Reference signs:

[0030] 1-injector body, 11-inner cavity, 12-methanol inlet hole, 13-pressure chamber,

[0031] 2-methanol-resistant sealing ring, 3-sealing gasket,

[0032] 4-control valve seat, 41-control chamber, 42-oil return metering hole, 43-oil inlet metering hole, 44-tapered hole, 45-first oil inlet, 451-oil inlet filter element, 46-first cavity, 47-first ring groove, 48-second oil inlet, 49-second ring groove,

[0033] 5-fixed nut valve assembly, 51-fixed nut, 511-step through hole, 512-step surface, 52-armature overtravel adjustment pad, 53-armature shaft, 531-spherical groove, 54-armature seat, 541-sliding hole, 55-switch ceramic ball, 56-armature shaft spring,

[0034] 6-solenoid valve assembly, 61-solenoid valve body, 611-second cavity, 62-solenoid valve pressure adjustment pad, 63-solenoid valve spring,

[0035] 7 - needle valve assembly, 71 - needle valve, 711 - groove, 72 - injector pressure regulating spring, 73 - pressure adjusting washer, 74 - spring seat, 75 - open washer, 8 - sealing assembly. DETAILED DESCRIPTION

[0036] Referring to Figure 1 and Figure 2 , a methanol fuel injector assembly, comprising: an injector body 1, a sealing assembly 8 and a control valve seat 4.

[0037] The injector body 1 is provided with an inner cavity 11, and the sealing assembly 8 is clamped in the inner cavity 11; the control valve seat 4 is arranged in the inner cavity 11, one end of the control valve seat 4 passes through the sealing assembly 8 to above the pressure chamber 13, and the other end of the control valve seat 4 is connected with the fixed nut valve assembly 5. Specifically, the sealing assembly 8 is put into the upper end of the injector body 1 and clamped in the inner cavity 11 of the injector body 1, the control valve seat 4 is put into the upper end surface of the injector body 1, the lower end of the control valve seat 4 passes through the sealing assembly 8 and is in surface contact with the inner cavity 11 of the injector body 1. The fixed nut valve assembly 5 is screwed into the injector body 1 and is in contact with and presses the upper surface of the control valve seat 4. The lower end of the injector body 1 is provided with a methanol inlet hole 12, and the injector body 1 is provided with a pressure chamber 13 in communication with the methanol inlet hole 12, high-pressure methanol enters the pressure chamber 13 through the methanol inlet hole 12, and the upper end of the control valve seat 4 extends into the pressure chamber 13.

[0038] The methanol fuel injector assembly of the utility model, high-pressure methanol enters the pressure chamber 13 through the methanol inlet hole 12, and the sealing assembly 8 is used to effectively control the leakage of methanol to the gap between the control valve seat 4 and the pressure chamber 13 and the gap between the control valve seat 4 and the inner cavity 11, the control valve seat 4 avoids the problem of seal failure caused by methanol corrosion, and the service life of the injector is prolonged.

[0039] Referring to Figure 3 , further, the sealing assembly 8 comprises a methanol-resistant sealing ring 2 and a sealing gasket 3, the methanol-resistant sealing ring 2 and the sealing gasket 3 are clamped in the inner cavity 11, and the sealing gasket 3 is arranged above the methanol-resistant sealing ring 2. The methanol-resistant sealing ring 2 is put into the upper end of the injector body 1 and clamped in the inner cavity 11 of the injector body 1; the sealing gasket 3 is put into the upper end of the injector body 1, the bottom surface of the sealing gasket 3 is in contact with the methanol-resistant sealing ring 2 and clamped in the inner cavity 11 of the injector body 1; the control valve seat 4 is put into the upper end surface of the injector body 1, and the lower end of the control valve seat 4 passes through the sealing gasket 3 and the methanol-resistant sealing ring 2 in sequence and is in surface contact with the injector body 1. The methanol-resistant sealing ring 2 is made of a material resistant to methanol corrosion and swelling, preferably, the methanol-resistant sealing ring 2 is made of butyl rubber, and the material of the sealing gasket 3 is fluororubber.

[0040] Referring to Figures 1 to 4, further, the injector body 1 further comprises an electromagnetic valve assembly 6, the fixed nut valve assembly 5 comprises a fixed nut 51, an armature excessive stroke adjusting pad 52, an armature shaft 53, an armature seat 54 and a switch ceramic ball 55, the fixed nut 51 is provided with a stepped through hole 511 penetrating through the axial direction, the armature excessive stroke adjusting pad 52 is arranged on the stepped surface 512 of the stepped through hole 511, the armature seat 54 is arranged in the stepped through hole 511, one end of the armature seat 54 is in contact with the electromagnetic valve assembly 6, and the other end of the armature seat 54 is in contact with the armature excessive stroke adjusting pad 52; the armature seat 54 is provided with a sliding hole 541 coaxial with the stepped through hole 511, the armature shaft 53 is slidingly arranged in the stepped through hole 511 and the sliding hole 541, the armature shaft 53 is provided with a spherical groove 531 matched with the switch ceramic ball 55 on one end surface, and the other end of the armature shaft 53 is connected with the electromagnetic valve assembly 6; the control valve seat 4 is provided with a tapered hole 44 matched with the switch ceramic ball 55. Specifically, the armature shaft 53 penetrates through the armature excessive stroke adjusting pad 52 and the stepped through hole 511, the spherical groove 531 is in contact with the switch ceramic ball 55, the armature shaft spring 56 is arranged between the inner wall of the control valve seat 4 and the outer side of the armature seat 54, the armature shaft spring 56 has a buffering effect when the electromagnetic valve assembly 6 applies pressure to the armature seat 54, and the armature shaft spring 56 also has energy storage when compressed, the armature shaft spring 56 accelerates the movement of the armature seat 54 when the armature seat 54 is forced to move upward, the required electromagnetic force is small, the electromagnetic force is positively correlated with the size of the electromagnetic valve assembly, which is important for the miniaturization of the electromagnetic valve, and is convenient for the miniaturization of the injector. The excessive stroke adjusting pad 52 is arranged to limit the limit position of the downward movement of the armature seat 54, so as to ensure that the armature seat 54 can quickly realize the opening or closing function. The armature shaft 53 is in clearance fit with the armature seat 54 and the fixed nut 51. The electromagnetic valve assembly 6 comprises an electromagnetic valve body 61, an electromagnetic valve pressure adjusting pad 62 and an electromagnetic valve spring 63, the electromagnetic valve body 61 is screwed into the injector body 1 and is provided with a second cavity 611; the electromagnetic valve spring 63 and the electromagnetic valve pressure adjusting pad 62 are arranged in the second cavity 611, one end of the electromagnetic valve spring 63 is in abutment with the surface of the electromagnetic valve pressure adjusting pad 62, and the other end of the electromagnetic valve spring 63 is in abutment with the upper end of the armature shaft 53. By adjusting the electromagnetic valve pressure adjusting pad 62 with different thicknesses, the pre-tightening force of the electromagnetic valve spring 63 can be adjusted.

[0041] Please refer to Figure 1 and Figure 5 , further, the control valve seat 4 is provided with a control chamber 41, the control chamber 41 is in communication with the oil return metering hole 42 and the oil inlet metering hole 43 respectively.

[0042] Further, the diameter of the oil inlet metering hole 43 is smaller than the diameter of the oil return metering hole 42.

[0043] Please refer to Figure 3Further, the control liquid in the control chamber 41 is engine oil, and the entering pressure of the engine oil is greater than the pressure of the methanol entering the injector body 1. As the control liquid, the engine oil is different from the fuel in the prior art, which is used as the lubricating oil of the injector internal parts. Only one kind of engine oil is used, and the user does not need to add multiple oils, and is not worried about the contamination of other oils due to the penetration of the control liquid. The engine oil enters from the high-pressure oil passage, a small amount of engine oil penetrates out, and when the injector is working, part of the engine oil enters the gap between the armature shaft 53 and the armature seat 54 when the oil returns, so that an oil film is formed between the armature shaft 53 and the inner wall of the armature seat 54, thereby increasing the durability of the armature shaft 53 and the armature seat 54. The special lubricating passage for lubricating the armature shaft 53 and the armature seat 54 in the prior art is avoided, and the structure of the injector is simpler.

[0044] Please refer to Figure 2 Further, the first oil inlet passage 45 is provided between the oil inlet metering hole 43 and the control chamber 41, and the first oil inlet passage 45 is provided with an oil inlet filter element 451. The oil inlet filter element 451 is arranged to filter the engine oil entering the first oil inlet passage 45, so that the engine oil entering the control chamber 41 does not contain large-particle impurities, thereby prolonging the service life of the injector.

[0045] Further, the outer surface of the first oil inlet passage 45 is provided with external threads, and the injector body 1 is provided with internal threads matched with the external threads. Through the threaded cooperation, the first oil inlet passage 45 is conveniently disassembled, thereby facilitating the replacement or maintenance of the oil inlet filter element 451.

[0046] Please refer to Figure 1 , Figure 3 and Figure 5 Further, the needle valve assembly 7 is further included, and the needle valve assembly 7 includes a needle valve 71, an injector pressure regulating spring 72, a pressure adjusting washer 73, a spring seat 74, and an open washer 75. The upper end of the needle valve 71 is slidingly arranged in the control valve seat 4, the outer surface of the needle valve 71 is provided with a groove 711, and the open washer 75 is arranged in the groove 711. The spring seat 74 is sleeved into the needle valve 71 and in contact with the upper end surface of the open washer 75. The injector pressure regulating spring 72 is sleeved into the needle valve 71, one end of the injector pressure regulating spring 72 is in contact with the upper end surface of the spring seat 74, and the other end is in abutment with the inner wall of the control valve seat 4. Specifically, the control valve seat 4 is provided with a first cavity 46, and the needle valve 71 is slidingly arranged in the first cavity 46.

[0047] Please refer to Figure 5Further, the inner surface of the control valve seat 4 is provided with a second annular groove 49, which is communicated with the oil inlet metering hole 43. Specifically, the second annular groove 49 is arranged between the first annular grooves 47, and the oil inlet metering hole 43 is communicated with the second annular groove 49 through the second oil inlet channel 48 in the injector body 1. The high-pressure oil enters from the oil inlet metering hole 43, and a high-pressure oil ring is formed in the second annular groove 49. When the armature seat 54 is lifted, the control chamber 41 returns oil, and the pressure thereof is reduced. The oil pressure of the high-pressure sealing ring is always greater than the methanol pressure of the pressure chamber 13, so that the methanol leakage into the control valve seat 4 due to the pressure reduction of the control chamber 41 is avoided, and the service life of the injector is prolonged. After the methanol in the pressure chamber 13 is injected, the pressure changes little, and the oil is relatively viscous. During injection, a small amount of oil penetrates, and even if the oil penetrates, it will be stored in the first annular groove 47.

[0048] Please refer to Figure 3 Further, the inner surface of the control valve seat 4 is provided with a second annular groove 49, which is communicated with the oil inlet metering hole 43. Specifically, the second annular groove 49 is arranged between the first annular grooves 47, and the oil inlet metering hole 43 is communicated with the second annular groove 49 through the second oil inlet channel 48 in the injector body 1. The high-pressure oil enters from the oil inlet metering hole 43, and a high-pressure oil ring is formed in the second annular groove 49. When the armature seat 54 is lifted, the control chamber 41 returns oil, and the pressure thereof is reduced. The oil pressure of the high-pressure sealing ring is always greater than the methanol pressure of the pressure chamber 13, so that the methanol leakage into the control valve seat 4 due to the pressure reduction of the control chamber 41 is avoided, and the service life of the injector is prolonged. After the methanol in the pressure chamber 13 is injected, the pressure changes little, and the oil is relatively viscous. During injection, a small amount of oil penetrates, and even if the oil penetrates, it will be stored in the first annular groove 47.

[0049] The working principle of the methanol fuel injector assembly is as follows:

[0050] In the initial state, the control liquid enters the control chamber 41 from the oil inlet metering hole 43, and a stable oil pressure is formed in the control chamber 41 due to the closing of the switch ceramic ball 55 under the pre-tightening spring force of the electromagnetic valve spring 63. The methanol enters the pressure chamber 13 through the methanol inlet hole 12 of the injector body 1, and a stable liquid pressure is formed in the pressure chamber 13 due to the closing of the needle valve 71 under the pre-tightening spring force of the injector pressure regulating spring 72 and the double action of the pressure surfaces at the upper and lower ends of the needle valve 71.

[0051] When the injection is in the open state, the solenoid valve assembly 6 generates electromagnetic force under the action of the opening control electrical signal to overcome the pre-tightening spring force of the solenoid valve spring 63 and lift the armature seat 54. The armature shaft 53 moves upward to the upper dead point under the action of the armature seat 54. The oil pressure is released by pushing the switch ceramic ball 55 open through the oil return metering hole 42. The depressurized oil flows back to the oil tank through the oil return metering hole 42. Since the diameter of the oil inlet metering hole 43 is smaller than the diameter of the oil return metering hole 43, the pressure in the control chamber 41 continuously decreases. When the upward force formed by the pressure-bearing surfaces at the upper and lower ends of the needle valve 71 overcomes the pre-tightening spring force of the injector pressure regulating spring 72, the needle valve 71 opens, and methanol is sprayed out from the nozzle of the injector body 1 and atomized.

[0052] When the injection is closed, the solenoid valve assembly 6 is de-energized by the closing control electrical signal. The solenoid valve assembly 6 does not generate electromagnetic force. The armature seat 54 slowly moves down to the initial position under the action of gravity and the spring force of the armature shaft spring 56. The spring force of the solenoid valve spring 6 presses down the armature 21, causing the switch ceramic ball 55 to close. The oil continuously flows into the control chamber 41 through the oil metering hole 43, so that the upward force formed by the pressure surfaces of the upper and lower ends of the needle valve 71 is less than the spring force of the injector pressure regulating spring 72, causing the needle valve 71 to move down until it closes. The injector body 1 stops injecting oil. The control chamber 41 is continuously filled with oil until a stable oil pressure is formed. Methanol flows into the pressure chamber 13 through the methanol inlet hole 12 until a stable hydraulic pressure is formed.

[0053] This invention relates to a methanol fuel injector assembly. A methanol-resistant sealing ring 2 and a sealing gasket 3 are provided on the outer surface of the control valve seat 4. This effectively controls methanol leakage between the control valve seat 4 and the pressure chamber 13, and between the control valve seat 4 and the inner cavity 11, preventing corrosion and wear of the injector and extending its lifespan. Engine oil is used as the control fluid. The oil's inlet pressure is greater than the methanol's inlet pressure, creating an oil film between the armature shaft and the inner wall of the armature seat, and between the needle valve and the inner wall of the control valve seat. This increases the durability of sliding components and reduces wear. Several first annular grooves 712 are provided on the side surface of the needle valve 71, where engine oil is stored, effectively preventing oil from entering the pressure chamber 13 from the mating point between the needle valve 471 and the control valve seat 4. An inlet filter element 451 is provided to ensure that the oil entering the control chamber 41 does not contain large particles of impurities, further extending the injector's service life. The formation of a high-pressure oil ring in the second annular groove 49 helps to prevent methanol from leaking into the control valve seat 4 due to a drop in pressure in the control chamber 41, thus extending the life of the injector.

[0054] The above-described specific embodiments have further detailed the purposes, technical solutions and beneficial effects of the present application, and it should be understood that the above-described embodiments are merely specific implementation methods of the present application and are not intended to limit the present application, and any modifications, equivalent replacements and improvements, etc. made within the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A methanol fuel injector assembly, characterized in that, include: The injector body (1) has an inner cavity (11); The sealing assembly (8) is fitted into the inner cavity (11); as well as The control valve seat (4) is located in the inner cavity (11), with one end passing through the sealing assembly (8) to the top of the pressure chamber (13), and the other end connected to the fixed nut valve assembly (5).

2. The methanol fuel injector assembly according to claim 1, characterized in that, The sealing assembly (8) includes a methanol-resistant sealing ring (2) and a sealing gasket (3). Both the methanol-resistant sealing ring (2) and the sealing gasket (3) are fitted in the inner cavity (11), and the sealing gasket (3) is positioned above the methanol-resistant sealing ring (2).

3. The methanol fuel injector assembly according to claim 1 or 2, characterized in that, The injector body (1) also includes a solenoid valve assembly (6). The fixed nut valve assembly (5) includes a fixed nut (51), an armature overtravel adjustment shim (52), an armature shaft (53), an armature seat (54), and a switch ceramic ball (55). The fixed nut (51) has a stepped through hole (511) that extends through its axial direction. The armature overtravel adjustment shim (52) is disposed on the stepped surface (512) of the stepped through hole (511). The armature seat (54) is disposed in the stepped through hole (511), with one end connected to the solenoid valve. The valve assembly (6) is in contact with the other end, and the armature overtravel adjustment pad (52) is in contact with the other end; the armature seat (54) is provided with a sliding hole (541) coaxial with the stepped through hole (511), the armature shaft (53) is slidably disposed in the stepped through hole (511) and the sliding hole (541), one end face of the armature shaft (53) is provided with a spherical groove (531) that cooperates with the switch ceramic ball (55), and the other end is connected to the solenoid valve assembly (6), and the control valve seat (4) is provided with a tapered hole (44) that cooperates with the switch ceramic ball (55).

4. The methanol fuel injector assembly according to claim 1 or 2, characterized in that, The control valve seat (4) is provided with a control chamber (41), which is connected to the return oil metering hole (42) and the inlet oil metering hole (43) respectively.

5. The methanol fuel injector assembly according to claim 4, characterized in that, The diameter of the inlet metering hole (43) is smaller than the diameter of the return metering hole (42).

6. The methanol fuel injector assembly according to claim 4, characterized in that, A first oil inlet channel (45) is provided between the oil metering hole (43) and the control chamber (41), and an oil inlet filter element (451) is provided in the first oil inlet channel (45).

7. The methanol fuel injector assembly according to claim 5 or 6, characterized in that, The control fluid in the control chamber (41) is engine oil, and the inlet pressure of the engine oil is greater than the pressure of methanol entering the injector body (1).

8. The methanol fuel injector assembly according to claim 1, 2, 5 or 6, characterized in that, It also includes a needle valve assembly (7), which includes a needle valve (71), an injector pressure regulating spring (72), a pressure adjusting pad (73), a spring seat (74), and an open washer (75). The upper end of the needle valve (71) is slidably disposed in the control valve seat (4). The outer surface of the needle valve (71) is provided with a groove (711), and the open washer (75) is inserted into the groove (711). The spring seat (74) is fitted into the needle valve (71) and contacts the upper end face of the open washer (75). The injector pressure regulating spring (72) is fitted into the needle valve (71), with one end contacting the upper end face of the spring seat (74) and the other end abutting against the inner wall of the control valve seat (4).

9. The methanol fuel injector assembly according to claim 1, 2, 5 or 6, characterized in that, The inner surface of the control valve seat (4) is provided with several first annular grooves (47) at intervals.

10. The methanol fuel injector assembly according to claim 5 or 6, characterized in that, The inner surface of the control valve seat (4) is provided with a second annular groove (49), which is connected to the oil metering hole (43).

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