Medium-pressure side-entering type methanol ejector

Abstract

A plurality of methanol spraying holes are formed in a spraying nozzle, the spraying nozzle is detachably and fixedly installed at the front end of a needle valve shell, and the methanol spraying nozzle shell, the needle valve shell, a split type needle valve assembly and an electromagnetic valve assembly are connected to define a methanol pressure storage cavity and an electromagnetic valve chamber. A spring seat of the split type needle valve assembly is fixedly connected with a needle valve and a guide rod respectively, the needle valve penetrates through a needle valve guide hole and a methanol passing hole, the guide rod penetrates through a guide rod guide hole, a spring is arranged between the spring seat and a spring installation seat on the front portion of a needle valve shell, and a methanol inlet and the methanol passing hole are communicated with a methanol pressure storage cavity. When the electromagnetic valve assembly enables the split type needle valve assembly to move forwards in the axial direction, the spring is compressed, the methanol passing hole is opened, and the methanol is sprayed out of the nozzle; and when the spring rebounds, the split type needle valve assembly resets, and the methanol passing hole is closed. The working pressure of the medium-pressure side inlet type methanol ejector can reach 3-5 MPa, the granularity of ejected methanol is finer, and the atomization effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of engine fuel injectors, and in particular to a medium-pressure side-entry methanol injector. Background Art

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

[0003] The above two types of methanol injectors cannot meet the use requirements, so it is necessary to design a medium-pressure methanol injector with a working pressure of 3MPa to 5MPa, so that the particle size of the methanol injection is finer and the atomization effect is better. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a side-entry methanol injector with a working pressure of 3MPa to 5MPa, so that the injected methanol particles are finer and the atomization effect is better.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A medium-pressure side-entry methanol injector comprises a methanol inlet, a methanol spray hole and a solenoid valve assembly. The medium-pressure side-entry methanol injector comprises 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 spray holes. The nozzle is detachably fixedly mounted on the front end of the needle valve housing. The methanol injector housing, the needle valve housing, the split needle valve assembly and the solenoid valve assembly are connected to form a methanol pressure storage chamber and a solenoid valve chamber.

[0007] The split needle valve assembly comprises a needle valve, a spring seat and a guide rod, wherein the spring seat is fixedly connected to the needle valve and the guide rod respectively, a methanol through hole, a needle valve guide hole and a guide rod guide hole are arranged in the needle valve housing, the needle valve passes through the needle valve guide hole and the methanol through hole, the guide rod passes through the guide rod guide hole, a spring mounting seat is arranged at the front of the needle valve housing, a spring is arranged between the spring mounting seat and the spring seat,

[0008] The methanol inlet and the methanol through hole are connected to the methanol pressure storage chamber,

[0009] When the solenoid valve assembly moves the split needle valve assembly axially forward, the spring is compressed, the methanol passage hole is opened, and methanol is ejected out of the nozzle; when the spring rebounds, the split needle valve assembly is reset, and the methanol passage hole is closed.

[0010] Preferably, the nozzle is fixedly mounted on the front end of the needle valve housing by a compression nut.

[0011] Preferably, a positioning platform is provided on the nozzle, and the positioning platform is a positioning surface for determining the injection direction when processing the methanol spray hole.

[0012] Preferably, the plurality of methanol spray holes are evenly distributed along the circumference on the front end surface of the nozzle.

[0013] Preferably, the plurality of methanol spray 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 to the rear housing, the front valve body is provided with the spring mounting seat, the needle valve guide hole and the methanol through hole, the methanol through hole comprises a main methanol through hole and a plurality of methanol through inclined holes,

[0015] The main methanol through hole is coaxially arranged with the needle valve guide hole and is close to the nozzle. A plurality of methanol through inclined holes are arranged in a circular array around the center line of the main methanol through hole. One end of the methanol through inclined hole close to the nozzle is connected to the main methanol through hole.

[0016] Preferably: the methanol inlet comprises an outer methanol inlet and an inner methanol inlet, the outer methanol inlet is opened on the methanol injector housing, the inner methanol inlet is opened on the needle valve housing in the methanol injector housing, and the outer methanol inlet is connected to the inner methanol inlet.

[0017] Preferably: the solenoid valve assembly includes a solenoid valve and a solenoid valve plastic package, the solenoid valve is located in the solenoid valve plastic package, the rear end of the needle valve housing is connected to the solenoid valve plastic package, and the methanol injector housing is respectively fixedly connected to the needle valve housing and the solenoid valve plastic package and is sleeved on the outside of both.

[0018] Preferably, sealing rings are provided between the methanol injector housing, the solenoid valve plastic package body and the needle valve housing.

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

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

[0021] The methanol injector housing, needle valve housing, split needle valve assembly and solenoid valve assembly of the medium-pressure side-entry methanol injector of the present invention are connected to form a methanol pressure storage chamber and a solenoid valve chamber, the methanol inlet and the methanol through hole are connected to the methanol pressure storage chamber, and the solenoid valve chamber is filled with lubricating oil when in use. Since a spring mounting seat is provided at the front of the needle valve housing, the spring is located between the spring mounting seat and the spring seat, that is, the spring is placed in front, and combined with the design of the spring seat, compared with the situation of the traditional methanol injector with a rear spring, the inertia of the needle valve is greatly reduced, and combined with the solenoid valve filled with lubricating oil, the response speed of the methanol injector can be maximized.

[0022] The nozzle and needle valve housing can be detachably fixed and installed, which makes nozzle replacement convenient and quick. Nozzles with different methanol spray hole parameters can be quickly replaced according to different needs. Nozzles with different methanol spray hole parameters are mainly manifested in different spray angles, number of nozzles and distribution of nozzles.

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

[0024] Figure 1 It is a structural schematic diagram of the medium-pressure side-entry methanol injector of the present invention;

[0025] Figure 2 yes Figure 1 A magnified schematic diagram of the structure in the middle;

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

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the front valve body;

[0028] Figure 5 yes Figure 4 A cross-sectional schematic diagram of

[0029] Figure 6 is a schematic diagram of the three-dimensional structure of the nozzle in the first embodiment;

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

[0031] Figure 8 is a schematic diagram of the three-dimensional structure of the nozzle in the second embodiment;

[0032] Fig. 9 yes Figure 8 A cross-sectional view of a nozzle;

[0033] In the figure: 1. methanol injector housing; 100. methanol inlet; 101. outer methanol inlet; 2. needle valve housing; 20. methanol pressure storage 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. partition; 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 plastic package; 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, wiring harness; 11, retaining spring. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is described in detail below in conjunction with 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 claims attached to the present invention.

[0035] In the description of the present invention, it should be noted that the terms "front", "rear", "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0037] Embodiment 1:

[0038] like Figure 1 Shown and Figure 2 The medium-pressure side-entry methanol injector shown comprises a methanol inlet 100, a methanol spray hole 401 and a solenoid valve assembly 5. The medium-pressure side-entry methanol 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 is provided with a plurality of methanol spray holes 401. The nozzle 4 is detachably fixedly mounted on the front end of the needle valve housing 2. The methanol injector housing 1, the needle valve housing 2, the split needle valve assembly 3 and the solenoid valve assembly 5 are connected to form a methanol pressure storage chamber 20 and a solenoid valve chamber 21. The solenoid valve chamber 21 is filled with lubricating oil.

[0039] The split needle valve assembly 3 includes a needle valve 301, a spring seat 9 and a guide rod 6. The spring seat 9 is respectively fixedly connected to the needle valve 301 and the guide rod 6. The needle valve housing 2 is provided with a methanol through 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 through hole 2010. 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. A spring 7 is provided between the spring mounting seat 2011 and the spring seat 9.

[0040] The methanol inlet 100 and the methanol through hole 2010 are respectively connected to the methanol pressure accumulation chamber 20. When the solenoid valve assembly 5 causes the split needle valve assembly to move axially forward, the spring 7 is compressed, the methanol through hole 2010 opens, and methanol is ejected out of the nozzle 4; when the spring 7 rebounds, the split needle valve assembly is reset, and the methanol through hole 2010 is closed.

[0041] Since a spring mounting seat 2011 is provided at the front of the needle valve housing 2, the spring 7 is located between the spring mounting seat 2011 and the spring seat 9, that is, the spring is placed in front. Combined with the design of the spring seat 9, compared with the traditional methanol injector with a rear spring, the inertia of the needle valve 301 is greatly reduced. Combined with the solenoid valve chamber 21 filled with lubricating oil, the response speed of the methanol injector can be maximized.

[0042] The nozzle 4 and the needle valve housing 2 are detachably fixed and installed, and the nozzle 4 can be replaced conveniently and quickly. According to different needs, nozzles with different methanol spray hole parameters can be quickly replaced. The nozzles with different methanol spray hole parameters are mainly manifested in different spray angles of the nozzles, the number of nozzles, and the distribution of the nozzles.

[0043] A fifth sealing ring E is installed on the outer peripheral surface of the methanol injector housing 1. The number and type of the fifth sealing ring E are determined according to the specific application occasion. When the medium pressure side-entry 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 mounted on the front end of the needle valve housing 2 by means of a clamping nut 8. The nozzle 4 can be quickly replaced by simply unscrewing the clamping nut 8.

[0045] In some embodiments, Figure 6 and Figure 7 As shown, a positioning platform 402 is provided on the nozzle 4, and the positioning platform 402 is a positioning surface for determining the injection direction when processing the methanol injection hole 401. 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 a cutting plane is provided on the circumferential surface of the cylindrical convex shell 404, and the cutting plane is the positioning platform 402. A plurality of methanol injection holes 401 can be evenly distributed on the front end surface of the nozzle 4 along the circumference, and the injection angle of each methanol injection hole 401 is the same, and the injection angle of the methanol injection hole 401 is Z. Of course, the injection angles of the plurality of methanol injection holes 401 can also be set to be different, according to specific circumstances.

[0046] Nozzles with different methanol spray hole parameters mainly differ in the spray angle, number of nozzles and distribution of nozzles.

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

[0048] like Figures 3 to 5 As shown, the needle valve housing 2 includes a front valve body 201 and a rear housing 202, the front valve body 201 and the rear housing 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 through hole 2010, the methanol through hole 2010 includes a main methanol through hole 2014 and a plurality of methanol through inclined holes 2013, the main methanol through hole 2014 is coaxially arranged with the needle valve guide hole 2012, and the main methanol through hole 2014 is close to the nozzle 4, the plurality of methanol through inclined holes 2013 are arranged in a circular array around the center line of the main methanol through hole 2014, and the end of the methanol through inclined hole 2013 close to the nozzle 4 is connected to the main methanol through hole 2014.

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

[0050] like Figure 1 As shown, the methanol inlet 100 includes an outer methanol inlet 101 and an inner methanol inlet 200. The outer methanol inlet 101 is opened on the methanol injector housing 1, and the inner methanol inlet 200 is opened on the needle valve housing 2 in the methanol injector housing 1. The outer methanol inlet 101 is connected to the inner methanol inlet 200.

[0051] like Figure 1 As shown, the solenoid valve assembly 5 includes a solenoid valve 501 and a solenoid valve plastic package 502, wherein the solenoid valve 501 is located in the solenoid valve plastic package 502, the rear end of the needle valve housing 2 is connected to the solenoid valve plastic package 502, and the methanol injector housing 1 is respectively fixedly connected to the needle valve housing 2 and the solenoid valve plastic package 502 and is sleeved outside the two. The rear end of the solenoid valve plastic package 502 is connected to a wiring harness 10.

[0052] In some embodiments, Figure 1 As shown, sealing rings are respectively arranged between the methanol injector housing 1 and the solenoid valve plastic package 502 and the needle valve housing 2. They are the first sealing ring A, the second sealing ring B and the third sealing ring C in sequence. The first sealing ring A is arranged between the methanol injector housing 1 and the solenoid valve plastic package 502, and the second sealing ring B and the third sealing ring C are arranged between the methanol injector housing 1 and the needle valve housing 2. The first sealing ring A, the second sealing ring B and the third sealing ring C are preferably sealed with O-rings.

[0053] The needle valve housing 2 is provided with a partition 22 separating the methanol pressure storage chamber 20 and the solenoid valve chamber 21. The partition 22 is provided with a guide rod guide hole. A sealing ring is provided between the guide rod guide hole and the guide rod 6. The fourth sealing ring D is preferably sealed with an O-ring.

[0054] The methanol pressure accumulation chamber 20 and the solenoid valve chamber 21 of the needle valve housing 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, so as to separate the methanol from the lubricating oil.

[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 to the spring seat 9 through the retaining spring 11. One end of the guide rod 6 is plugged and fixed to the spring seat 9.

[0056] During installation, the methanol injector is installed on the methanol injector valve seat through three pressure plates and bolts.

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

[0058] Methanol enters the methanol pressure accumulation chamber 20 from the methanol inlet 100 on the side. Under the action of the solenoid valve, the guide rod 6 is pushed forward, 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 passage hole 2010 is opened, and the methanol is ejected out of the nozzle 4; when the spring 7 rebounds, the split needle valve assembly is reset, the methanol passage hole 2010 is closed, and the nozzle 4 stops ejecting methanol.

[0059] The working pressure of the medium-pressure side-entry methanol injector of the present invention can reach 3MPa to 5MPa. The particle size of the methanol sprayed is finer, the atomization effect is better, and the combustion economy is higher. It not only realizes high-pressure methanol injection, but also realizes the ability to withstand large back pressure. For example, it can withstand 25MPa explosion pressure. In this way, not only can the medium-pressure side-entry methanol injector of the present invention be installed on the intake duct of the cylinder head, and methanol is sprayed into the intake manifold, but also when the intake valve is opened, methanol fuel gas enters the combustion chamber, and the engine combustion mode is intake manifold multi-point injection (Otto cycle). The medium-pressure side-entry methanol injector of the present invention can also be installed on the cylinder head, and methanol is directly sprayed into the combustion chamber, and the engine combustion mode is direct injection in the cylinder (Otto cycle + Diesel cycle).

[0060] Embodiment 2:

[0061] The difference between the second embodiment and the first embodiment lies in the different layout and injection angle of the methanol injection holes 401 .

[0062] like Figure 8 and Fig. 9 As shown, multiple methanol spray holes 401 are unevenly distributed on the front end surface of the nozzle 4, and the spray angles of the multiple methanol spray holes 401 are not necessarily the same. Some of the methanol spray holes 401 have a spray angle of α, and some of the methanol spray holes 401 have a spray angle of β, α≠β. Of course, the spray angles of each methanol spray hole 401 can also be set to be the same, according to specific circumstances.

[0063] The medium-pressure side-entry methanol injector of the present invention can achieve an operating pressure of 3MPa to 5MPa. The particle size of the methanol sprayed is finer, the atomization effect is better, and the combustion economy is higher. It not only realizes high-pressure methanol injection, but also has the ability to withstand large back pressure. It can be installed on the intake manifold to realize multi-point injection of the intake manifold; it can also be directly installed on the cylinder head to realize direct injection in the cylinder.

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

Claims

1. A medium-pressure side-entry methanol injector, comprising a methanol inlet (100), a methanol spray hole (401) and a solenoid valve assembly (5), characterized in that: The medium-pressure side-entry methanol 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) is provided with a plurality of methanol spray holes (401); the nozzle (4) is detachably fixedly mounted on the front end of the needle valve housing (2); the methanol injector housing (1), the needle valve housing (2), the split needle valve assembly (3) and the solenoid valve assembly (5) are connected to form a methanol pressure storage 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 respectively fixedly connected to the needle valve (301) and the guide rod (6); a methanol through hole (2010), a needle valve guide hole (2012) and a guide rod guide hole are provided in the needle valve housing (2); the needle valve (301) passes through the needle valve guide hole (2012) and the methanol through hole (2010); 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); a spring (7) is provided between the spring mounting seat (2011) and the spring seat (9); The methanol inlet (100) and the methanol through hole (2010) are connected to the methanol pressure storage chamber (20). When the solenoid valve assembly (5) causes the split needle valve assembly to move forward axially, the spring (7) is compressed, the methanol passage hole (2010) is opened, and methanol is ejected out of the nozzle (4); when the spring (7) rebounds, the split needle valve assembly is reset, and the methanol passage hole (2010) is closed.

2. The medium-pressure side-entry methanol injector according to claim 1, characterized in that: The nozzle (4) is fixedly mounted on the front end of the needle valve housing (2) via a compression nut (8).

3. The medium-pressure side-entry methanol injector according to claim 2, characterized in that: A positioning platform (402) is provided on the nozzle (4), and the positioning platform (402) is a positioning surface for determining the injection direction when processing the methanol injection hole (401).

4. The medium-pressure side-entry methanol injector according to claim 3, characterized in that: The plurality of methanol spray holes (401) are evenly distributed along the circumference on the front end surface of the nozzle (4).

5. The medium-pressure side-entry methanol injector according to claim 3, characterized in that: The plurality of methanol spray holes (401) are distributed unevenly at intervals on the front end surface of the nozzle (4).

6. The medium-pressure side-entry methanol injector according to claim 1, characterized in that: The needle valve housing (2) comprises a front valve body (201) and a rear housing (202), the front valve body (201) and the rear housing (202) being fixed by welding, the front valve body (201) being provided with the spring mounting seat (2011), the needle valve guide hole (2012) and the methanol through hole (2010), the methanol through hole (2010) comprising a main methanol through hole (2014) and a plurality of methanol through inclined holes (2013), The main methanol through hole (2014) is coaxially arranged with the needle valve guide hole (2012), and the main methanol through hole (2014) is close to the nozzle (4). A plurality of methanol through inclined holes (2013) are arranged in a circular array around the center line of the main methanol through hole (2014), and one end of the methanol through inclined hole (2013) close to the nozzle (4) is connected to the main methanol through hole (2014).

7. The medium-pressure side-entry methanol injector according to claim 1 is characterized in that: The methanol inlet (100) comprises an outer methanol inlet (101) and an inner methanol inlet (200); the outer methanol inlet (101) is provided on the methanol injector housing (1); the inner methanol inlet (200) is provided on the needle valve housing (2) in the methanol injector housing (1); and the outer methanol inlet (101) is communicated with the inner methanol inlet (200).

8. The medium-pressure side-entry methanol injector according to claim 1, characterized in that: The solenoid valve assembly (5) comprises a solenoid valve (501) and a solenoid valve plastic package (502), wherein the solenoid valve (501) is located inside the solenoid valve plastic package (502), the rear end of the needle valve housing (2) is connected to the solenoid valve plastic package (502), and the methanol injector housing (1) is respectively fixedly connected to the needle valve housing (2) and the solenoid valve plastic package (502) and is sleeved outside the two.

9. The medium-pressure side-entry methanol injector according to claim 8, characterized in that: Sealing rings are respectively provided between the methanol injector housing (1), the solenoid valve plastic package (502), and the needle valve housing (2).

10. The medium-pressure side-entry methanol injector according to claim 1, characterized in that: The needle valve housing (2) is provided with a partition (22) for separating the methanol pressure storage chamber (20) and the solenoid valve chamber (21); the partition (22) is provided with the guide rod guide hole; and a sealing ring is provided between the guide rod guide hole and the guide rod (6).

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