A mechanical methanol injection device

Abstract

This patent relates to the technical field of internal combustion engine injectors, specifically a mechanical methanol injection device, including a needle valve pair, a nozzle cap, a limit plate, a push rod, a pressure regulating spring, a body assembly, a spring seat, a pressure regulating screw, an elastic gasket, a fuel distribution block, an oil inlet joint and a connecting cap. The needle valve pair, the limit plate and the body assembly are installed in sequence from bottom to top. The grooves on the outside of the fuel shell, the fuel channel and the grooves on the outside of the guide sleeve are connected in sequence to form a fuel channel. The grooves on the outside of the cooling oil shell, the cooling oil channel and the grooves on the outside of the support ring are connected in sequence to form a cooling oil channel. The needle valve pair and the body assembly do not require additional processing of cooling oil holes and fuel holes, etc., and there is no drilling process, which ensures that the structure of each component is simple, the processing technology is more secure, and the component structure has higher strength.

Description

Technical Field

[0001] The invention relates to the technical field of internal combustion engine fuel injectors, in particular to a mechanical methanol injection device. Background Art

[0002] Currently, with the promotion of low-carbon fuels, the operating environment of needle valve components in internal combustion engines has become increasingly harsh, and the requirements for needle valve components are becoming increasingly stringent. On the one hand, the reliability requirements for needle valve components are increasing, and more and higher requirements are being placed on the performance of the materials, such as: high temperature resistance, corrosion resistance, impact resistance, good self-lubrication and good wear resistance. On the other hand, the volatile and volatile characteristics of low-carbon fuels place higher requirements on the leakage of needle valve components, such as achieving zero leakage in the needle valve component gap.

[0003] The needle valve assembly of the traditional injection system needs to take into account the above requirements at the same time, so it is impossible to achieve the best in all aspects, which also limits the reliability of the product.

[0004] At the same time, in the processing of needle valve pairs and device bodies, cooling oil holes and fuel holes are generally processed by drilling. On the one hand, the processing technology is complicated, especially the deep hole processing of the device body is difficult. On the other hand, the channel processing will form weak points such as high stress areas, which will reduce the service life of the product. Summary of the Invention

[0005] The present invention aims to provide a mechanical methanol injection device, which adopts a combined type to omit the drilling requirement and reduce the production difficulty.

[0006] In order to achieve the above-mentioned purpose, the basic scheme of the present invention is as follows: a mechanical methanol injection device, comprising a needle valve pair, a nozzle cap, a limit disk, a push rod, a pressure regulating spring, a body assembly, a spring seat, a pressure regulating screw, an elastic gasket, a fuel distribution block, an oil inlet joint and a connecting cap, the needle valve pair, the limit disk and the body assembly are installed in sequence from bottom to top, and the nozzle cap is installed on the outside of the needle valve pair, the limit disk and the body assembly for fixing the needle valve pair, the limit disk and the body assembly, a through hole is provided in the middle of the body assembly, the elastic gasket, the pressure regulating screw, the spring seat, the pressure regulating spring and the push rod are installed in the middle hole of the body assembly from top to bottom, the oil inlet joint is installed at the upper end of the body assembly, the connecting cap is installed on the outside of the oil inlet joint and the body assembly for fixing the oil inlet joint and the body assembly, the fuel distribution block is located inside the oil inlet joint, and the fuel distribution block is abutted against the upper end surface of the body assembly;

[0007] The needle valve pair includes a needle valve, a cooling sleeve, a support ring and a guide sleeve. The support ring is installed in the cooling sleeve. A cooling ring cavity is formed between the lower part of the support ring and the cooling sleeve. A plurality of grooves communicating with the cooling ring cavity are provided on the outer side of the support ring. A two-stage center hole is provided in the middle of the support ring. The guide sleeve is installed in the larger center hole of the support ring. The needle valve is installed in the guide sleeve, and the lower part of the needle valve is slidably connected to the smaller center hole of the support ring. The top of the needle valve abuts against the push rod. A fuel chamber is formed between the bottom of the guide sleeve and the support ring. A plurality of grooves communicating with the fuel chamber are provided on the outer side of the guide sleeve.

[0008] The body assembly includes a protective shell, a cooling oil shell, and a fuel shell. The protective shell is installed on the outside of the cooling oil shell, and the fuel shell is installed on the inside of the cooling oil shell. The outsides of the fuel shell and the cooling oil shell are each provided with a plurality of grooves. The range limiter is provided with a plurality of fuel channels and a plurality of cooling oil channels. The grooves on the outside of the fuel shell, the fuel channels, and the grooves on the outside of the guide sleeve are sequentially connected to form a fuel channel. The grooves on the outside of the cooling oil shell, the cooling oil channels, and the grooves on the outside of the support ring are sequentially connected to form a cooling oil channel.

[0009] The fuel distribution block is provided with a plurality of fuel distribution flow channels, and the lower ends of the plurality of fuel distribution flow channels are connected to the grooves on the outside of the fuel shell; the oil inlet joint is provided with a fuel inlet, a cooling oil inlet and a cooling oil outlet, the fuel inlet is connected to the fuel distribution flow channel, and the cooling oil inlet and cooling oil outlet are respectively connected to the grooves on different cooling oil shells.

[0010] Furthermore, the upper end face of the support ring, the upper end face of the limit plate and the lower end face of the oil inlet joint are all provided with a plurality of cooling oil connection grooves, the cooling oil connection grooves on the upper end face of the support ring are connected with the grooves on the outside of the support ring and the cooling oil channel in the limit plate, the cooling oil connection grooves on the upper end face of the limit plate are connected with the cooling oil channel in the limit plate and the grooves on the outside of the fuel shell, the cooling oil inlet and cooling oil outlet on the oil inlet joint are respectively connected to different cooling oil connection grooves on the lower end face of the oil inlet joint, and the cooling oil connection grooves on the lower end face of the oil inlet joint are connected with the grooves on the outside of the cooling oil shell, the upper end face of the guide sleeve and the upper end face of the limit plate are both provided with a plurality of fuel connection grooves, the fuel connection grooves on the upper end face of the guide sleeve are connected with the grooves on the outside of the guide sleeve, and the fuel connection grooves on the upper end face of the limit plate are connected with the fuel channel in the limit plate.

[0011] Furthermore, a sealing ring groove is provided on the inner side of the guide sleeve, and a radial through hole connected to the sealing ring groove is provided on the guide sleeve, a through hole connected to the through hole on the guide sleeve is provided on the support ring, and the through hole on the support ring is connected to the groove on the outside of the support ring.

[0012] Furthermore, a stepped groove is provided inside the nozzle cap, the needle valve pair and the limit disc are placed in the nozzle cap and limited by the stepped groove inside the nozzle cap, the bottom of the needle valve pair extends out of the nozzle cap, and the upper part of the nozzle cap is threadedly connected to the lower part of the protective shell.

[0013] Furthermore, a stepped groove is provided inside the connecting cap, the oil inlet joint is placed in the connecting cap and is limited by the stepped groove inside the connecting cap, and the lower part of the connecting cap is threadedly connected to the upper part of the protective shell.

[0014] Furthermore, the grooves on the outer sides of the guide sleeve, the support ring, the fuel shell and the cooling shell are evenly distributed on their respective outer circumferential surfaces.

[0015] The beneficial effects of this solution: (1) The needle valve body in this solution is a combined needle valve body, which includes three layers, namely a cooling sleeve, a support ring, and a guide sleeve. The cooling sleeve is the outermost layer and is mainly in contact with high-temperature gas and gas corrosion; the support ring is in the middle and is mainly subjected to the impact and support of the needle valve; the guide sleeve is the innermost layer and contacts the outer circular guide surface of the needle valve to control the needle valve and play a guiding role. Therefore, the cooling sleeve needs to be made of high-temperature resistant and corrosion-resistant materials, the support ring needs to be made of impact-resistant materials, and the guide sleeve needs to be made of materials with good lubricity and good wear resistance. Through the three-layer combined structure, the high-temperature resistance, corrosion resistance, impact resistance, wear resistance and lubrication of the needle valve body can be maximized, and the reliability of the product can be maximized. The body assembly includes a protective shell, a cooling oil shell, and a fuel shell. The protective shell mainly plays a connecting support and rust-proof role. The cooling oil shell and the fuel shell are in contact with the fuel. The three parts can be selected from materials according to needs to maximize the reliability of the product.

[0016] (2) A plurality of grooves are provided on the outside of the support ring and the outside of the cooling shell, which are connected to the cooling cavity at the bottom of the cooling sleeve to form a cooling oil circulation path; a plurality of fuel grooves are provided on the outside of the guide sleeve and the outside of the fuel shell, which are connected to the fuel chamber to form a fuel path. Through the arrangement of the above structures, the needle valve pair and the body assembly do not need additional processing of cooling oil holes and fuel holes, etc., and there is no drilling process, which ensures that the structure of each component is simple, the processing technology is more secure, and the component structure is stronger.

[0017] (3) The grooves on the outer circle of the guide sleeve and the grooves on the outer circle of the fuel shell are evenly distributed on their respective outer circles, so that the needle valve pair and the body assembly are subjected to uniform force in all directions in the high-pressure area, the deformation is uniform, and the wear in all aspects during use is also uniform. This structure can greatly improve the reliability and service life of the needle valve pair and the body assembly.

[0018] (4) The grooves on the outer circle of the support ring and the grooves on the outer circle of the cooling oil housing are evenly distributed on their respective outer circles, so that the cooling oil is evenly distributed around the needle valve body and the body assembly. The contact area between the cooling oil and the needle valve body is greatly improved, the cooling oil circulation efficiency is greatly improved, the heat exchange efficiency is improved, and the cooling effect on the needle valve pair is greatly improved.

[0019] (5) The sealing ring grooves and through holes provided on the guide sleeve and the support ring can, on the one hand, improve the lubricity of the needle valve pair, and on the other hand, establish a stable and effective sealing oil belt at the gap between the needle valve pair, ensuring that when using fuels such as methanol or ammonia, no leakage will occur through the gap between the pairs, causing fuel to escape. This structure can achieve zero leakage of fuel from the mechanical needle valve pair, thereby improving the safety of the product.

[0020] (6) Each sealing end face is provided with a cooling oil connection groove on the outer ring and a fuel connection groove on the inner ring. The fuel connection groove on the inner ring is sealed by the cooling oil connection groove on the outer ring to prevent the fuel from leaking through the sealing surface and improving the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the cooling oil passage in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the specific structure of the fuel distribution block in an embodiment of the present invention;

[0024] Figure 4 is a top view of a body assembly in an embodiment of the present invention;

[0025] Figure 5 is a top view of a range limiter in an embodiment of the present invention;

[0026] Figure 6 is a bottom view of the range limiter in an embodiment of the present invention;

[0027] Figure 7 2 is a top view of the needle valve assembly in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The figure marks in the drawings of the specification include: nozzle tightening cap 1, limit plate 2, push rod 3, pressure regulating spring 4, spring upper seat 5, pressure regulating screw 6, elastic gasket 7, fuel distribution block 8, oil inlet joint 9, connecting tightening cap 10, fuel distribution flow channel 11, fuel inlet 12, cooling oil inlet 13, cooling oil outlet 14, first-stage cooling oil connection groove 15, protective shell 16, cooling oil shell 17, fuel shell 18, fuel channel 19, cooling oil channel 20, first-stage fuel connection groove 21, second-stage cooling oil connection groove 22, second-stage fuel connection groove 23, tertiary cooling oil connection groove 24, needle valve 25, cooling sleeve 26, support ring 27, guide sleeve 28, cooling ring cavity 29, fuel chamber 30, fourth-stage cooling oil connection groove 31, third-stage fuel connection groove 32, sealing ring groove 33, through hole 34.

[0030] Example

[0031] Basically as attached Figure 1 、 Figure 2 As shown: A mechanical methanol injection device, including a needle valve pair, a nozzle cap 1, a limit disc 2, a push rod 3, a pressure regulating spring 4, a body assembly, a spring seat 5, a pressure regulating screw 6, an elastic gasket 7, a fuel distribution block 8, an oil inlet joint 9 and a connecting cap 10. The needle valve pair, the limit disc 2 and the body assembly are installed in sequence from bottom to top, and the nozzle cap 1 is installed on the outside of the needle valve pair, the limit disc 2 and the body assembly to fix the needle valve pair, the limit disc 2 and the body assembly. A stepped groove is provided inside the nozzle cap 1. The needle valve pair and the limit disc 2 are placed in the nozzle cap 1 and are limited by the stepped groove inside the nozzle cap 1. The bottom of the needle valve pair extends out of the nozzle cap 1, and the upper part of the nozzle cap 1 is threadedly connected to the lower part of the protective shell 16. A through hole is provided in the middle of the body assembly, and the elastic gasket 7, the pressure-regulating screw 6, the spring upper seat 5, the pressure-regulating spring 4 and the push rod 3 are installed in the middle hole of the body assembly from top to bottom. The oil inlet joint 9 is installed at the upper end of the body assembly, and the connecting cap 10 is installed on the outside of the oil inlet joint 9 and the body assembly to fix the oil inlet joint 9 and the body assembly. A stepped groove is provided inside the connecting cap 10, and the oil inlet joint 9 is placed in the connecting cap 10 and is limited by the stepped groove inside the connecting cap 10. The lower part of the connecting cap 10 is threadedly connected to the upper part of the protective shell 16. The fuel distribution block 8 is located inside the oil inlet joint 9, and the fuel distribution block 8 is against the upper end surface of the body assembly;

[0032] Combine Figure 3As shown, the fuel distribution block 8 is provided with a number of evenly distributed fuel distribution channels 11, including a transverse fuel distribution channel 11 located on the upper end surface of the fuel distribution block 8 and a vertical fuel distribution channel 11 located on the side surface of the fuel distribution block 8. The oil inlet connector 9 is provided with a fuel inlet 12, a cooling oil inlet 13, and a cooling oil outlet 14. The fuel inlet 12 is connected to the fuel distribution channel 11. The lower end surface of the oil inlet connector 9 is provided with two semi-annular primary cooling oil connection grooves 15, which are respectively connected to the cooling oil inlet 13 and the cooling oil outlet 14.

[0033] The body assembly includes a protective shell 16, a cooling oil shell 17 and a fuel shell 18. The protective shell 16 is installed on the outside of the cooling oil shell 17, and the fuel shell 18 is installed inside the cooling oil shell 17. The elastic gasket 7, the pressure regulating screw 6, the spring upper seat 5, the pressure regulating spring 4 and the push rod 3 are installed in the fuel shell 18 from top to bottom. Figure 4 As shown, the outer sides of the fuel shell 18 and the cooling oil shell 17 are provided with a number of evenly distributed grooves. The grooves on the outer sides of the fuel shell 18 are connected to the fuel distribution channel 11; the grooves on the outer sides of the cooling oil shell 17 are respectively connected to the two cooling oil connection grooves; Figure 5 As shown, the range limiter 2 is provided with a plurality of fuel channels 19 and a plurality of cooling oil channels 20. The upper end surface of the range limiter 2 is provided with an annular primary fuel connection groove 21 and two semi-annular secondary cooling oil connection grooves 22. The primary fuel connection groove 21 connects the fuel channel 19 in the range limiter 2 and the groove outside the fuel shell 18. The two secondary cooling oil connection grooves 22 respectively connect half of the cooling oil connection grooves in the range limiter 2 and half of the grooves outside the cooling oil shell 17. Figure 6 As shown, the lower end surface of the range limiter plate 2 is provided with an annular secondary fuel connection groove 23 and two semi-annular tertiary cooling oil connection grooves 24. The secondary fuel connection groove 23 is connected to the fuel channel 19 in the range limiter plate 2, and the two tertiary cooling oil connection grooves 24 are respectively connected to half of the cooling oil channels 20 in the range limiter plate 2.

[0034] The needle valve assembly includes a needle valve 25, a cooling sleeve 26, a support ring 27 and a guide sleeve 28. The support ring 27 is installed in the cooling sleeve 26. A cooling ring cavity 29 is formed between the lower part of the support ring 27 and the cooling sleeve 26. Figure 7As shown, the outer side of the support ring 27 is evenly distributed with a number of grooves connected to the cooling ring cavity 29, and the middle part of the support ring 27 is provided with a two-stage middle hole, the guide sleeve 28 is installed in the large middle hole of the support ring 27, the needle valve 25 is installed in the guide sleeve 28, and the lower part of the needle valve 25 is slidably connected to the small middle hole of the support ring 27, the top of the needle valve 25 is abutted against the push rod 3, and a fuel chamber 30 is formed between the bottom of the guide sleeve 28 and the support ring 27. The outer side of the guide sleeve 28 is evenly distributed with a number of grooves connected to the fuel chamber 30; the upper end surface of the support ring 27 is provided with two semi-annular fourth-stage cooling oil connection grooves 31 connecting half of the grooves on the outer side of the support ring 27 and the two third-stage cooling oil connection grooves 24 on the lower end surface of the limit plate 2, the upper end surface of the guide sleeve 28 is provided with an annular third-stage fuel connection groove 32 connecting the outer groove of the guide sleeve 28 and the second-stage fuel connection groove 23 on the lower end surface of the limit plate 2, the groove on the outer side of the fuel shell 18, the fuel channel 19 and the groove on the outer side of the guide sleeve 28 are connected in sequence to form a fuel passage, combined with Figure 7 As shown, the groove on the outside of the cooling oil housing 17, the cooling oil channel 20 and the groove on the outside of the support ring 27 are connected in sequence to form a cooling oil passage; a sealing ring groove 33 is provided on the inner side of the guide sleeve 28, and a radial through hole 34 connected to the sealing ring groove 33 is provided on the guide sleeve 28, and a through hole 34 connected to the through hole 34 on the guide sleeve 28 is provided on the support ring 27, and the through hole 34 on the support ring 27 is connected to the groove on the outside of the support ring 27.

[0035] The specific implementation process is as follows: during operation, the cooling oil is introduced through the cooling oil inlet 13 and flows through the first-level cooling oil connection groove 15 on one side, the groove on the outside of the cooling oil housing 17, the second-level cooling oil connection groove 22, the cooling oil channel 20, the third-level cooling oil connection groove 24, the fourth-level cooling oil connection groove 31 and the groove on the outside of the support ring 27, and finally flows into the cooling cavity. Then, it passes through the groove on the outside of the support ring 27 on the other side, the fourth-level cooling oil connection groove 31, the third-level cooling oil connection groove 24, the cooling oil channel 20, the second-level cooling oil connection groove 22, the groove on the outside of the cooling oil housing 17 and the first-level cooling oil connection groove 15, and finally flows out from the cooling oil outlet 14, thereby cooling the needle valve pair. When the cooling oil flows through the needle valve pair, the contact area with the needle valve 25 body can be maximized, and the needle valve 25 body can be evenly contacted, thereby greatly improving the cooling efficiency of the needle valve pair, preventing carbon accumulation on the needle valve pair, and improving the service life and reliability of the needle valve pair.

[0036] The fuel is introduced through the fuel inlet 12 and is evenly diverted through the fuel distribution flow channel 11 of the fuel distribution block 8 into the groove on the side of the fuel shell 18, the first-level fuel connection groove 21, the fuel channel 19, the second-level fuel connection groove 23, the third-level fuel connection groove 32 and the groove on the outside of the guide sleeve 28, and finally flows into the fuel chamber 30, and finally flows into the head of the needle valve pair to realize injection oil supply. When the fuel flows through the body assembly and the needle valve pair, it is evenly distributed, ensuring that the effect of the high-pressure fuel on the body assembly and the needle valve pair is evenly distributed around, so that the deformation is evenly distributed during operation, avoiding the phenomenon of large local deformation; at the same time, the fuel leaked through the gap of the needle valve pair flows along the gap of the needle valve pair into the sealing ring groove 33, and is carried away by the cooling oil in the through hole 34 on the support ring 27 and the guide ring, preventing the fuel from leaking along the gap of the needle valve pair, thereby greatly increasing the safety of the product; the fuel passing through each high-pressure sealing surface is sealed and protected by the cooling oil ring groove of the outer ring to prevent leakage, thereby further improving the safety of the product.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A mechanical methanol injection device, characterized in that: It includes a needle valve pair, a nozzle tight cap, a range limiter, a push rod, a pressure regulating spring, a body assembly, a spring upper seat, a pressure regulating screw, an elastic gasket, a fuel distribution block, an oil inlet joint and a connecting tight cap. The needle valve pair, the range limiter and the body assembly are installed in sequence from bottom to top, and the nozzle tight cap is installed on the outside of the needle valve pair, the range limiter and the body assembly to fix the needle valve pair, the range limiter and the body assembly. A through hole is provided in the middle of the body assembly. The elastic gasket, the pressure regulating screw, the spring upper seat, the pressure regulating spring and the push rod are installed in the middle hole of the body assembly from top to bottom. The oil inlet joint is installed on the upper end of the body assembly. The connecting tight cap is installed on the outside of the oil inlet joint and the body assembly to fix the oil inlet joint and the body assembly. The fuel distribution block is located inside the oil inlet joint, and the fuel distribution block is against the upper end surface of the body assembly. The needle valve pair includes a needle valve, a cooling sleeve, a support ring and a guide sleeve. The support ring is installed in the cooling sleeve. A cooling ring cavity is formed between the lower part of the support ring and the cooling sleeve. A plurality of grooves communicating with the cooling ring cavity are provided on the outer side of the support ring. A two-stage center hole is provided in the middle of the support ring. The guide sleeve is installed in the larger center hole of the support ring. The needle valve is installed in the guide sleeve, and the lower part of the needle valve is slidably connected to the smaller center hole of the support ring. The top of the needle valve abuts against the push rod. A fuel chamber is formed between the bottom of the guide sleeve and the support ring. A plurality of grooves communicating with the fuel chamber are provided on the outer side of the guide sleeve. The body assembly includes a protective shell, a cooling oil shell, and a fuel shell. The protective shell is installed on the outside of the cooling oil shell, and the fuel shell is installed on the inside of the cooling oil shell. The outsides of the fuel shell and the cooling oil shell are each provided with a plurality of grooves. The range limiter is provided with a plurality of fuel channels and a plurality of cooling oil channels. The grooves on the outside of the fuel shell, the fuel channels, and the grooves on the outside of the guide sleeve are sequentially connected to form a fuel channel. The grooves on the outside of the cooling oil shell, the cooling oil channels, and the grooves on the outside of the support ring are sequentially connected to form a cooling oil channel. The fuel distribution block is provided with a plurality of fuel distribution flow channels, and the lower ends of the plurality of fuel distribution flow channels are connected to the grooves on the outside of the fuel shell; the oil inlet joint is provided with a fuel inlet, a cooling oil inlet and a cooling oil outlet, the fuel inlet is connected to the fuel distribution flow channel, and the cooling oil inlet and cooling oil outlet are respectively connected to the grooves on different cooling oil shells.

2. A mechanical methanol injection device according to claim 1, characterized in that: The upper end surface of the support ring, the upper end surface of the limit plate and the lower end surface of the oil inlet joint are all provided with a plurality of cooling oil connection grooves, the cooling oil connection grooves on the upper end surface of the support ring are connected with the grooves on the outside of the support ring and the cooling oil channel in the limit plate, the cooling oil connection grooves on the upper end surface of the limit plate are connected with the cooling oil channel in the limit plate and the grooves on the outside of the fuel shell, the cooling oil inlet and cooling oil outlet on the oil inlet joint are respectively connected to different cooling oil connection grooves on the lower end surface of the oil inlet joint, and the cooling oil connection grooves on the lower end surface of the oil inlet joint are connected with the grooves on the outside of the cooling oil shell, the upper end surface of the guide sleeve and the upper end surface of the limit plate are both provided with a plurality of fuel connection grooves, the fuel connection grooves on the upper end surface of the guide sleeve are connected with the grooves on the outside of the guide sleeve, and the fuel connection grooves on the upper end surface of the limit plate are connected with the fuel channel in the limit plate.

3. A mechanical methanol injection device according to claim 2, characterized in that: A sealing ring groove is provided on the inner side of the guide sleeve, and a radial through hole connected to the sealing ring groove is provided on the guide sleeve. A through hole connected to the through hole on the guide sleeve is provided on the support ring, and the through hole on the support ring is connected to the groove outside the support ring.

4. A mechanical methanol injection device according to claim 3, characterized in that: A stepped groove is provided inside the nozzle cap, the needle valve pair and the limit disc are placed in the nozzle cap and limited by the stepped groove inside the nozzle cap, the bottom of the needle valve pair extends out of the nozzle cap, and the upper part of the nozzle cap is threadedly connected to the lower part of the protective shell.

5. The mechanical methanol injection device according to claim 4, characterized in that: A stepped groove is provided inside the connecting cap, the oil inlet joint is placed in the connecting cap and is limited by the stepped groove inside the connecting cap, and the lower part of the connecting cap is threadedly connected to the upper part of the protective shell.

6. The mechanical methanol injection device according to claim 1, characterized in that: The grooves on the outer sides of the guide sleeve, the support ring, the fuel shell and the cooling shell are evenly distributed on their respective outer circumferential surfaces.

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