Medium pressure in feed methanol injector

Abstract

The application discloses a medium-pressure side-in type methanol injector, a plurality of methanol injection holes are formed in a nozzle, the nozzle is detachably and fixedly installed at the front end of a needle valve shell, a methanol injector shell, the needle valve shell, a split type needle valve assembly and a solenoid valve assembly are connected to enclose a methanol pressure accumulation cavity and a solenoid valve chamber, spring seats of the split type needle valve assembly are respectively fixedly connected with a needle valve and a guide rod, the needle valve passes through a needle valve guide hole and a methanol passing hole, the guide rod passes through a guide rod guide hole, a spring is arranged between the spring seat and a spring mounting seat of the front part of the needle valve shell, a methanol inlet and the methanol passing hole are in communication with the methanol pressure accumulation cavity, when the split type needle valve assembly is moved forward along the axial direction under the action of the solenoid valve assembly, the spring is compressed, the methanol passing hole is opened, and the methanol is injected out of the nozzle; when the spring rebounds, the split type needle valve assembly is reset, and the methanol passing hole is closed. The working pressure of the medium-pressure side-in type methanol injector can reach 3MPa-5MPa, the methanol particles ejected are finer, and the atomization effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine fuel injectors, in particular to a medium-pressure side-injection methanol injector. BACKGROUND

[0002] In the prior art, most of the methanol injectors on the market have a low injection working pressure of only 0.5-1 MPa. The low injection pressure will result in a particle size of the injected methanol greater than 100 μm, poor atomization, high wall coverage of methanol, high methanol consumption, poor emission indicators, and the need for additional aftertreatment equipment to meet emission requirements. Although there are also high-pressure direct-injection methanol injectors with a working pressure of about 50-70 MPa, this type of high-pressure direct-injection methanol injector can only be used for in-cylinder direct injection, and has a complex structure, high cost, and poor reliability. In addition, the peripheral alcohol supply unit needs to provide high pressure, and the requirement for the peripheral alcohol supply unit is also high.

[0003] The above two types of methanol injectors cannot meet the use requirements, and therefore a medium-pressure methanol injector is needed, which has a working pressure of 3-5 MPa to make the particle size of the injected methanol finer and the atomization effect better. SUMMARY

[0004] In view of the above defects of the prior art, the technical problem to be solved by the present application is to provide a side-injection methanol injector with a working pressure of 3-5 MPa to make the particle size of the injected methanol finer and the atomization effect better.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] A medium-pressure side-injection methanol injector includes a methanol inlet, a methanol injection hole, and an electromagnetic valve assembly. The medium-pressure side-injection methanol injector includes a methanol injector housing, a needle valve housing, a split needle valve assembly, and a nozzle. The nozzle is provided with a plurality of methanol injection holes. The nozzle is detachably fixed and installed at the front end of the needle valve housing. The methanol injector housing, the needle valve housing, the split needle valve assembly, and the electromagnetic valve assembly are connected to form a methanol pressure accumulation chamber and an electromagnetic valve chamber.

[0007] The split needle valve assembly includes a needle valve, a spring seat, and a guide rod. The spring seat is fixedly connected to the needle valve and the guide rod, respectively. The needle valve housing has a methanol passing hole, a needle valve guide hole, and a guide rod guide hole. The needle valve passes through the needle valve guide hole and the methanol passing hole. The guide rod passes through the guide rod guide hole. The front part of the needle valve housing is provided with a spring mounting seat. A spring is arranged between the spring mounting seat and the spring seat.

[0008] The methanol inlet and the methanol passing hole are in communication with the methanol pressure accumulation chamber.

[0009] When the electromagnetic valve assembly moves the split needle valve assembly forward along the axial direction, the spring is compressed, the methanol passes through the hole, and the methanol is injected out of the nozzle; when the spring rebounds, the split needle valve assembly resets, and the methanol pass-through hole is closed.

[0010] Preferably, the nozzle is fixedly installed at the front end of the needle valve housing through a compression nut.

[0011] Preferably, the nozzle is provided with a positioning platform, which is a positioning surface for determining the injection direction when the methanol injection hole is processed.

[0012] Preferably, a plurality of methanol injection holes are uniformly distributed on the front end surface of the nozzle.

[0013] Preferably, a plurality of methanol injection holes are unevenly distributed on the front end surface of the nozzle.

[0014] Preferably, the needle valve housing comprises a front valve body and a rear housing, the front valve body is fixedly connected with the rear housing, the front valve body is provided with the spring mounting seat, the needle valve guide hole and the methanol pass-through hole, the methanol pass-through hole comprises a main methanol pass-through hole and a plurality of methanol pass-through inclined holes,

[0015] The main methanol pass-through hole is coaxially arranged with the needle valve guide hole, and the main methanol pass-through hole is close to the nozzle, a plurality of methanol pass-through inclined holes are circumferentially arranged around the center line of the main methanol pass-through hole, and the end of the methanol pass-through inclined hole close to the nozzle is in communication with the main methanol pass-through hole.

[0016] Preferably, the methanol inlet comprises an outer methanol inlet and an inner methanol inlet, the outer methanol inlet is provided on the methanol injector housing, the inner methanol inlet is provided on the needle valve housing in the methanol injector housing, and the outer methanol inlet is in communication with the inner methanol inlet.

[0017] Preferably, the electromagnetic valve assembly comprises an electromagnetic valve and an electromagnetic valve plastic package, the electromagnetic valve is located in the electromagnetic valve plastic package, the rear end of the needle valve housing is connected with the electromagnetic valve plastic package, and the methanol injector housing is fixedly connected with the needle valve housing and the electromagnetic valve plastic package and is sleeved outside them.

[0018] Preferably, sealing rings are respectively arranged between the methanol injector housing and the electromagnetic valve plastic package and the needle valve housing.

[0019] Preferably, the needle valve housing is provided with a partition plate separating the methanol pressure accumulation cavity and the electromagnetic valve chamber, the partition plate is provided with the guide rod guide hole, and a sealing ring is arranged between the guide rod guide hole and the guide rod.

[0020] After the above technical solution, the beneficial effects of the present application are:

[0021] In the present application, the methanol injector housing, the needle valve housing, the split needle valve assembly and the electromagnetic valve assembly of the medium pressure side entry type methanol injector are connected to form a methanol pressure accumulation cavity and an electromagnetic valve chamber, the methanol inlet and the methanol through hole are connected with the methanol pressure accumulation cavity, and the magnetic valve chamber is filled with lubricating oil during use. Since the front part of the needle valve housing is provided with a spring mounting seat, the spring is located between the spring mounting seat and the spring seat, that is, the spring is front-mounted, and in combination with the design of the spring seat, compared with the rear-mounted spring of the conventional methanol injector, the inertia of the needle valve is greatly reduced, and in combination with the full lubricating oil of the electromagnetic valve, the response speed of the methanol injector can be maximized.

[0022] The nozzle and the needle valve housing are detachably fixed and installed, which facilitates quick replacement of the nozzle. Different nozzle parameters of methanol injection holes can be quickly replaced according to different requirements. Different nozzle parameters of methanol injection holes mainly differ in the injection angle of the nozzle, the number of nozzles and the distribution of nozzles.

[0023] When the electromagnetic valve assembly moves the split needle valve assembly forward along the axial direction, the spring is compressed, the methanol through hole is opened, and the methanol is injected out of the nozzle; when the spring rebounds, the split needle valve assembly resets, and the methanol through hole is closed. The working pressure of the medium pressure side entry type methanol injector can reach 3MPa-5MPa. The injected methanol has finer particle size, better atomization effect and higher combustion economy. The high-pressure methanol injection is realized, and the ability to withstand large back pressure is also realized. In this way, the medium pressure side entry type methanol injector of the present application can be installed on the cylinder head intake port to inject methanol into the intake manifold, and when the intake valve is opened, the methanol gas enters the combustion chamber, and the engine combustion mode is intake manifold multi-point injection (Otto cycle). The medium pressure side entry type methanol injector of the present application can also be installed on the cylinder head to directly inject methanol into the combustion chamber, and the engine combustion mode is in-cylinder direct injection (Otto cycle + Diesel cycle). BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of the medium pressure side entry type methanol injector of the present application;

[0025] Figure 2 is a structural schematic view of the medium pressure side entry type methanol injector of the present application; Figure 1 is an enlarged schematic view of the medium part structure;

[0026] Figure 3 is a structural view of the needle valve housing;

[0027] Figure 4 is a three-dimensional structural schematic view of the front valve body;

[0028] Figure 5 yes Figure 4 A cross-sectional view;

[0029] Figure 6 This is a three-dimensional structural diagram of the nozzle in Embodiment 1;

[0030] Figure 7 yes Figure 6 A cross-sectional view of the nozzle;

[0031] Figure 8 This is a three-dimensional structural diagram of the nozzle in Example 2;

[0032] Figure 9 yes Figure 8 A cross-sectional view of the nozzle;

[0033] In the diagram: 1. Methanol injector housing; 100. Methanol inlet; 101. Outer methanol inlet; 2. Needle valve housing; 20. Methanol accumulator chamber; 200. Inner methanol inlet; 201. Front valve body; 2010. Methanol through hole; 202. Rear housing; 21. Solenoid valve chamber; 2011. Spring mounting seat; 2012. Needle valve guide hole; 2013. Methanol through oblique hole; 2014. Main methanol through hole; 22. Baffle plate; 3. Split type Needle valve assembly; 301, needle valve; 4, nozzle; 401, methanol spray hole; 402, positioning platform; 403, annular base; 404, cylindrical convex shell; 5, solenoid valve assembly; 501, solenoid valve; 502, solenoid valve encapsulation body; 6, guide rod; 7, spring; 8, clamping nut; 9, spring seat; A, first sealing ring; B, second sealing ring; C, third sealing ring; D, fourth sealing ring; E, fifth sealing ring; 10, wire harness; 11, snap ring. Detailed Implementation

[0034] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims.

[0035] In the description of this invention, it should be noted that the terms "front", "rear", "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 this invention.

[0036] Furthermore, although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used in this document do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0037] Example 1:

[0038] like Figure 1 As shown and Figure 2 The medium-pressure side-inlet methanol injector shown includes a methanol inlet 100, a methanol nozzle 401, and a solenoid valve assembly 5. The injector comprises a methanol injector housing 1, a needle valve housing 2, a split needle valve assembly 3, and a nozzle 4. The nozzle 4 has multiple methanol nozzles 401 and is detachably and fixedly mounted on the front end of the needle valve housing 2. The methanol injector housing 1, needle valve housing 2, split needle valve assembly 3, and solenoid valve assembly 5 are connected to form a methanol accumulator chamber 20 and a solenoid valve chamber 21. The solenoid valve chamber 21 is filled with lubricating oil.

[0039] The split-type needle valve assembly 3 includes a needle valve 301, a spring seat 9, and a guide rod 6. The spring seat 9 is fixedly connected to the needle valve 301 and the guide rod 6. The needle valve housing 2 has a methanol passage hole 2010, a needle valve guide hole 2012, and a guide rod guide hole. The needle valve 301 passes through the needle valve guide hole 2012 and the methanol passage hole 2010, and the guide rod 6 passes through the guide rod guide hole. A spring mounting seat 2011 is provided at the front of the needle valve housing 2, and a spring 7 is provided between the spring mounting seat 2011 and the spring seat 9.

[0040] Methanol inlet 100 and methanol passage hole 2010 are respectively connected to methanol accumulator chamber 20. When the solenoid valve assembly 5 moves the split needle valve assembly forward along the axis, the spring 7 is compressed, the methanol passage hole 2010 is opened, and methanol is sprayed out of nozzle 4. When the spring 7 rebounds, the split needle valve assembly is reset, and the methanol passage hole 2010 is closed.

[0041] Because the needle valve housing 2 has a spring mounting seat 2011 at the front, and the spring 7 is located between the spring mounting seat 2011 and the spring seat 9, the spring is placed in front. In addition, the design of the spring seat 9 greatly reduces the inertia of the needle valve 301 compared with the traditional case of a rear-mounted spring in a methanol injector. With the solenoid valve chamber 21 filled with lubricating oil, the response speed of the methanol injector can be maximized.

[0042] The nozzle 4 is detachably fixedly installed with the needle valve shell 2, and the nozzle 4 can be conveniently and quickly replaced. Different methanol nozzle parameters can be quickly replaced according to different requirements. Different methanol nozzle parameters mainly include different nozzle spray angles, different nozzle numbers and different nozzle distribution conditions.

[0043] The fifth sealing ring E is installed on the outer circumferential surface of the methanol injector shell 1, and the number and type of the fifth sealing ring E are determined according to specific use occasions. When the medium-pressure side inlet methanol injector is installed on the intake manifold or on the cylinder head, the fifth sealing ring E plays a sealing role.

[0044] In some embodiments, the nozzle 4 is fixedly installed at the front end of the needle valve shell 2 by the compression nut 8. By only unscrewing the compression nut 8, the nozzle 4 can be quickly replaced.

[0045] In some embodiments, as shown in Figure 6 and Figure 7 , the nozzle 4 is provided with a positioning platform 402, which is a positioning surface for determining the spray direction when the methanol injection hole 401 is processed. Therefore, directional injection of different methanol injection holes 401 can be achieved. The nozzle 4 includes an annular base 403 and a cylindrical convex shell 404 protruding from the annular base 403, and the circumferential surface of the cylindrical convex shell 404 is provided with a tangent plane, which is the positioning platform 402. A plurality of methanol injection holes 401 can be uniformly distributed on the front end surface of the nozzle 4 along the circumference, and the spray angle of each methanol injection hole 401 is the same, and the spray angle of the methanol injection hole 401 is Z. Of course, the spray angles of the plurality of methanol injection holes 401 can also be set to be different, which is set according to specific conditions.

[0046] Different methanol nozzle parameters mainly include different nozzle spray angles, different nozzle numbers and different nozzle distribution conditions.

[0047] The nozzle 4 includes an annular base 403 and a cylindrical convex shell 404 protruding from the annular base 403, and the circumferential surface of the cylindrical convex shell 404 is provided with a tangent plane, which is the positioning platform 402.

[0048] As shown in Figures 3 to 5 , the needle valve shell 2 includes a front valve body 201 and a rear shell 202, and the front valve body 201 and the rear shell 202 are fixedly connected by friction welding. The front valve body 201 is provided with a spring mounting seat 2011, a needle valve guide hole 2012 and a methanol passing hole 2010. The methanol passing hole 2010 includes a main methanol passing hole 2014 and a plurality of methanol passing inclined holes 2013. The main methanol passing hole 2014 is coaxially arranged with the needle valve guide hole 2012, and is close to the nozzle 4. The plurality of methanol passing inclined holes 2013 are arranged in a circumferential array around the center line of the main methanol passing hole 2014, and the end of the methanol passing inclined hole 2013 close to the nozzle 4 is in communication with the main methanol passing hole 2014.

[0049] The arrangement of the plurality of methanol through inclined holes 2013 and the main methanol through hole 2014 can ensure that the methanol enters the front nozzle 4 from the methanol pressure accumulation chamber 20. The number and aperture size of the methanol through inclined holes 2013 are designed according to the specifications of the medium-pressure side inlet methanol injector, and need to ensure that the methanol fully enters the front end and ensure that the flow area changes smoothly.

[0050] As shown in Figure 1 , the methanol inlet 100 includes an outer methanol inlet 101 and an inner methanol inlet 200, the outer methanol inlet 101 is provided on the methanol injector shell 1, the inner methanol inlet 200 is provided in the needle valve shell 2 inside the methanol injector shell 1, and the outer methanol inlet 101 is in communication with the inner methanol inlet 200.

[0051] As shown in Figure 1 , the electromagnetic valve assembly 5 includes an electromagnetic valve 501 and an electromagnetic valve plastic package 502, the electromagnetic valve 501 is located in the electromagnetic valve plastic package 502, the rear end of the needle valve shell 2 is connected to the electromagnetic valve plastic package 502, and the methanol injector shell 1 is fixedly connected to the needle valve shell 2 and the electromagnetic valve plastic package 502 and is sleeved outside the two. The rear end of the electromagnetic valve plastic package 502 is connected to the wire harness 10.

[0052] In some embodiments, as shown in Figure 1 , the methanol injector shell 1 is provided with a sealing ring between the electromagnetic valve plastic package 502 and the needle valve shell 2. In order, the first sealing ring A, the second sealing ring B and the third sealing ring C are provided between the methanol injector shell 1 and the electromagnetic valve plastic package 502, and the second sealing ring B and the third sealing ring C are provided between the methanol injector shell 1 and the needle valve shell 2. The first sealing ring A, the second sealing ring B and the third sealing ring C preferably adopt O-ring sealing.

[0053] The needle valve shell 2 is provided with a partition plate 22 separating the methanol pressure accumulation chamber 20 and the electromagnetic valve chamber 21, the partition plate 22 is provided with a guide rod guide hole, and a sealing ring is provided between the guide rod guide hole and the guide rod 6. It is the fourth sealing ring D, and the fourth sealing ring D preferably adopts O-ring sealing.

[0054] The methanol pressure accumulation chamber 20 and the electromagnetic valve chamber 21 of the needle valve shell 2 are sealed and isolated by the first sealing ring A, the second sealing ring B, the third sealing ring C and the fourth sealing ring D, and the methanol and the lubricating oil are separated.

[0055] One end of the needle valve 301 is inserted into the spring seat 9, and one end of the needle valve 301 is fixedly connected with the spring seat 9 through the snap spring 11. One end of the guide rod 6 is fixedly connected with the spring seat 9.

[0056] When installing, the methanol injector is installed on the methanol injector valve seat by three pressure plates and bolts.

[0057] The injection principle of the medium-pressure side-injection methanol injector is as follows:

[0058] Methanol enters the methanol accumulator chamber 20 from the side methanol inlet 100. The guide rod 6 is pushed forward under the action of the electromagnetic valve, and then the spring seat 9 and the needle valve 301 are pushed forward. At this time, the spring 7 is compressed, the needle valve 301 moves forward, the methanol is injected out of the nozzle 4 through the hole 2010. When the spring 7 rebounds, the split needle valve assembly resets, the hole 2010 is closed, and the nozzle 4 stops injecting methanol.

[0059] The working pressure of the medium-pressure side-injection methanol injector of the present application can reach 3-5 MPa. The particle size of the injected methanol is finer, the atomization effect is better, and the combustion economy is higher. Both high-pressure methanol injection and the ability to withstand large back pressure are achieved. For example, it can withstand a burst pressure of 25 MPa. In this way, the medium-pressure side-injection methanol injector of the present application can be installed on the cylinder head intake port to inject methanol into the intake manifold. When the intake valve is opened, the methanol gas enters the combustion chamber, and the engine combustion mode is intake manifold multi-point injection (Otto cycle). The medium-pressure side-injection methanol injector of the present application can also be installed on the cylinder head to inject methanol directly into the combustion chamber, and the engine combustion mode is direct injection (Otto cycle + Diesel cycle).

[0060] Example Two:

[0061] The difference between Example Two and Example One is that the layout and injection angle of the methanol injection holes 401 are different.

[0062] As shown in Figs. Figure 8 and Figure 9 , the plurality of methanol injection holes 401 are unevenly distributed on the front end face of the nozzle 4, and the injection angles of the plurality of methanol injection holes 401 are not necessarily the same. The injection angle of some methanol injection holes 401 is α, and the injection angle of some methanol injection holes 401 is β, α≠β. Of course, the injection angle of each methanol injection hole 401 can be set to be the same, according to the specific situation.

[0063] The working pressure of the medium-pressure side-injection methanol injector of the present application can reach 3-5 MPa. The particle size of the injected methanol is finer, the atomization effect is better, and the combustion economy is higher. Both high-pressure methanol injection and the ability to withstand large back pressure are achieved. Not only can it be installed on the intake manifold to achieve intake manifold multi-point injection, but also can be directly installed on the cylinder head to achieve direct injection.

[0064] The present application is not limited to the above examples, and all improvements based on the concept, principle, structure and method of the present application are within the scope of the present application.

Claims

1. A medium pressure side entry methanol injector, comprising a methanol inlet (100), a methanol injection hole (401) and a solenoid valve assembly (5), characterized in that: the medium pressure side entry methanol injector comprises a methanol injector shell (1), a needle valve shell (2), a split needle valve assembly (3) and a nozzle (4), a plurality of methanol injection holes (401) are formed on the nozzle (4), the nozzle (4) is detachably fixed and installed at the front end of the needle valve shell (2), the methanol injector shell (1), the needle valve shell (2), the split needle valve assembly (3) and the solenoid valve assembly (5) are connected to form a methanol pressure accumulation chamber (20) and a solenoid valve chamber (21), the split needle valve assembly (3) comprises a needle valve (301), a spring seat (9) and a guide rod (6), the spring seat (9) is fixedly connected with the needle valve (301) and the guide rod (6) respectively, the needle valve shell (2) has a methanol passing hole (2010), a needle valve guide hole (2012) and a guide rod guide hole, the needle valve (301) passes through the needle valve guide hole (2012) and the methanol passing hole (2010), the guide rod (6) passes through the guide rod guide hole, the front part of the needle valve shell (2) is provided with a spring mounting seat (2011), and the spring (7) is arranged between the spring mounting seat (2011) and the spring seat (9), the methanol inlet (100) and the methanol passing hole (2010) are communicated with the methanol pressure accumulation chamber (20), when the solenoid valve assembly (5) moves the split needle valve assembly forward in the axial direction, the spring (7) is compressed, the methanol passing hole (2010) is opened, and the methanol is injected out of the nozzle (4); when the spring (7) rebounds, the split needle valve assembly resets, and the methanol passing hole (2010) is closed; the needle valve shell (2) comprises a front valve body (201) and a rear shell (202), the front valve body (201) is fixedly welded with the rear shell (202), the front valve body (201) is provided with the spring mounting seat (2011), the needle valve guide hole (2012) and the methanol passing hole (2010), and the methanol passing hole (2010) comprises a main methanol passing hole (2014) and a plurality of methanol passing inclined holes (2013), the main methanol passing hole (2014) is coaxially arranged with the needle valve guide hole (2012), and the main methanol passing hole (2014) is close to the nozzle (4), a plurality of methanol passing inclined holes (2013) are arranged in a circumferential array around the center line of the main methanol passing hole (2014), and one end of the methanol passing inclined hole (2013) close to the nozzle (4) is communicated with the main methanol passing hole (2014). The nozzle (4) is fixedly installed at the front end of the needle valve shell (2) through a compression nut (8).

2. The medium pressure side-in methanol injector of claim 1, wherein: The nozzle (4) is provided with a positioning platform (402), and the positioning platform (402) is a positioning surface for determining the injection direction when the methanol injection hole (401) is processed.

3. The medium pressure side-in methanol injector of claim 2, wherein: ​ 4. The medium pressure side-in methanol injector of claim 3 wherein: A plurality of said methanol injection holes (401) are evenly distributed on the front end surface of said nozzle (4) along the circumference.

5. The medium pressure side-in methanol injector of claim 3 wherein: A plurality of said methanol injection holes (401) are unevenly distributed on the front end surface of said nozzle (4).

6. The medium pressure side-in methanol injector of claim 1 wherein: Said methanol inlet (100) comprises an outer methanol inlet (101) and an inner methanol inlet (200), said outer methanol inlet (101) is arranged on said methanol injector shell (1), said inner methanol inlet (200) is arranged on said needle valve shell (2) in said methanol injector shell (1), and said outer methanol inlet (101) is in communication with said inner methanol inlet (200).

7. The medium pressure side-in methanol injector of claim 1 wherein: Said electromagnetic valve assembly (5) comprises an electromagnetic valve (501) and an electromagnetic valve plastic package (502), said electromagnetic valve (501) is located in said electromagnetic valve plastic package (502), the rear end of said needle valve shell (2) is connected with said electromagnetic valve plastic package (502), and said methanol injector shell (1) is fixedly connected with said needle valve shell (2) and said electromagnetic valve plastic package (502) respectively and is sleeved outside them.

8. The medium pressure side-in methanol injector of claim 7 wherein: Sealing rings are arranged between said methanol injector shell (1) and said electromagnetic valve plastic package (502) and said needle valve shell (2) respectively.

9. The medium pressure side-in methanol injector of claim 1 wherein: Said needle valve shell (2) is provided with a partition plate (22) separating said methanol pressure accumulation cavity (20) and said electromagnetic valve chamber (21), said partition plate (22) is provided with said guide rod guide hole, and a sealing ring is arranged between said guide rod guide hole and said guide rod (6).

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