Marine methanol ejector

Abstract

The utility model discloses a marine methanol ejector which comprises a shell assembly, an electromagnetic valve assembly, an elastic return element, a valve element assembly and a valve seat assembly, a middle hole is formed in the shell assembly, and the electromagnetic valve assembly, the elastic return element, the valve element assembly and the valve seat assembly are arranged in the middle hole from top to bottom; a plurality of feeding windows are formed in the lower portion of the shell assembly, and a cavity communicated with the feeding windows is formed in the lower portion of the middle hole; a filter screen is arranged at the position, corresponding to the feeding window, of the outer portion of the shell assembly. The valve seat assembly comprises a valve seat body and a spraying hole plate arranged on the lower side of the valve seat body, and spraying holes communicated with the outside are formed in the spraying hole plate. The elastic return element can make the valve element assembly abut against the valve seat assembly. The electromagnetic valve assembly can drive the valve element assembly to be separated from the valve seat assembly. According to the utility model, the risk of orifice blockage can be reduced, and the leakage probability can be reduced.

Description

Technical Field

[0001] The utility model relates to injector technology, in particular to a marine methanol injector. Background Art

[0002] With the increasingly prominent problems of energy shortage and environmental pollution, as well as the implementation of the "dual carbon" policy, the combustion technology of internal combustion engines faces a series of challenges such as cleanliness and high efficiency. It is urgent to develop the efficient and clean application of zero-carbon and low-carbon fuels in the field of internal combustion engines. Methanol, with rich raw materials, large-scale mass production, and unique physical and chemical properties, can effectively reduce the generation of CO, NOx, and unburned hydrocarbons, and is widely regarded as one of the important fuels for future sustainable development. However, due to the low technical maturity of the current methanol fuel injection system, poor product reliability, unreasonable structural design and flow channel layout, problems such as nozzle clogging, poor sealing performance, or leakage are likely to occur.

[0003] CN116816565A discloses a marine methanol engine alcohol injector with a split valve core structure, including a solenoid valve assembly, a housing, a valve core assembly, a guide seat, a valve seat assembly, a limit ring, and an elastic member. The valve core assembly includes a valve rod, a stroke limiting disc, a steel ball seat, a steel ball, and a connecting member. The bottom of the valve rod is detachably connected to the steel ball seat through the connecting member. An arc groove matching the steel ball is provided on the lower end surface of the steel ball seat. The steel ball is fixed below the steel ball seat, and the steel ball is located on the valve seat assembly. Undoubtedly, the technical solution disclosed in the above patent document is a beneficial attempt in the technical field. However, the methanol fuel enters through the through hole at the top of the iron core shell and sprays out through the nozzle. During the process, the methanol fuel needs to pass through multiple components such as the iron core, valve rod, guide seat, stroke limiting disc, and valve seat, which is prone to performance degradation due to component wear. Moreover, the large number of components through which the methanol fuel passes will also increase the leakage probability. Therefore, there is still room for improvement in the structural design and flow channel layout of this technical solution. Summary of the Utility Model

[0004] In view of this, the purpose of the present utility model is to provide a marine methanol injector, which can reduce the risk of nozzle clogging and the leakage probability.

[0005] A marine methanol injector in the present utility model includes a housing assembly, a solenoid valve assembly, an elastic return element, a valve core assembly, and a valve seat assembly. A middle hole is provided inside the housing assembly, and the solenoid valve assembly, elastic return element, valve core assembly, and valve seat assembly are arranged in the middle hole from top to bottom;

[0006] A plurality of feed windows are circumferentially and spacedly arranged at the lower part of the housing assembly, and a cavity communicating with the feed windows is arranged at the lower part of the middle hole; a filter screen is arranged outside the housing assembly corresponding to the position of the feed windows; the valve seat assembly includes a valve seat body and a spray hole plate arranged on the lower side of the valve seat body, and spray holes communicating with the outside are arranged on the spray hole plate;

[0007] The elastic return element can make the valve core assembly abut against the valve seat assembly so that the cavity is not communicated with the spray holes on the spray hole plate; the solenoid valve assembly can drive the valve core assembly to be separated from the valve seat assembly so that the cavity is communicated with the spray holes on the spray hole plate.

[0008] Furthermore, a first installation ring groove is arranged outside the housing assembly. The filter screen includes an inner layer metal filter screen and an outer layer metal filter screen. The inner layer metal filter screen winds around the first installation ring groove for one week and then forms a ring by end-to-end welding. The outer layer metal filter screen winds around the inner layer metal filter screen for one week and then forms a ring by end-to-end welding.

[0009] Furthermore, the weld at the end-to-end welding of the inner layer metal filter screen is staggered from the weld at the end-to-end welding of the outer layer metal filter screen, and both the weld at the end-to-end welding of the inner layer metal filter screen and the weld at the end-to-end welding of the outer layer metal filter screen are staggered from the positions of the respective feed windows.

[0010] Furthermore, a second installation ring groove and a third installation ring groove are arranged outside the housing assembly. The second installation ring groove and the third installation ring groove are respectively located above and below the first installation ring groove, and first sealing rings are installed in both the second installation ring groove and the third installation ring groove.

[0011] Furthermore, the housing assembly includes a gland and a housing main body; the solenoid valve assembly includes an installation skeleton, an electromagnetic coil, an iron core joint, a support ring and a navigation socket. An annular chamber is arranged on one side of the installation skeleton facing the housing assembly. The electromagnetic coil is wound in the annular chamber of the installation skeleton. A through hole is arranged in the middle of the installation skeleton. The lower part of the iron core joint extends into the through hole, and the support ring is arranged at the lower part of the iron core joint; the navigation socket is arranged on the upper side of the housing main body, and the navigation socket abuts against the outside of the gland.

[0012] Furthermore, a plurality of bolts are further included. A plurality of threaded holes are circumferentially and spacedly arranged at the upper part of the housing main body. The rod parts of the respective bolts are connected to the respective threaded holes. The lower side surfaces of the heads of the respective bolts simultaneously press on the navigation socket and the gland. The upper side of the support skeleton simultaneously abuts against the gland and the navigation socket, and the lower side of the support skeleton abuts against the housing main body.

[0013] Further, the spool assembly includes a valve stem, a guiding and limiting cylinder, and a ball valve head. The valve stem includes an upper section, a middle section, and a lower section arranged in sequence from top to bottom. The diameter of the upper section is greater than that of the middle section, and the diameter of the middle section is greater than that of the lower section. The guiding and limiting cylinder is fixed on the housing body, and the guiding and limiting cylinder is in sliding fit with the middle section. A cavity is formed between the lower section and the housing body, and the lower section is connected to the ball valve head.

[0014] Further, an upper accommodation cavity is provided on one side of the iron core joint facing the upper section, and a lower accommodation cavity is provided on one side of the upper section facing the iron core joint. The upper part of the elastic return element extends into the upper accommodation cavity and abuts against the iron core joint, and the lower part of the elastic return element extends into the lower accommodation cavity and abuts against the upper section.

[0015] Further, a second sealing ring is provided between the housing body and the valve seat body, a third sealing ring is provided between the lower side of the support skeleton and the housing body, and a fourth sealing ring is provided between the through hole of the support skeleton and the iron core joint.

[0016] Further, it further includes a mask nut. The mask nut is located above the gland. The middle part of the iron core joint is in threaded fit with the gland. The upper part of the iron core joint extends upward out of the gland, and the upper part of the iron core joint is in threaded fit with the mask nut.

[0017] The beneficial effects of the present utility model are as follows: The present utility model filters the methanol fuel through a filter screen, which can reduce the impurities in the methanol fuel. The reduction of impurities can reduce the risk of nozzle blockage. And by optimizing the layout of the housing assembly, the solenoid valve, the spool assembly, and the valve seat assembly, the flow path of the methanol fuel is shorter, and the number of components it flows through is less, which can reduce the leakage probability. Moreover, the methanol fuel is more concentrated, which is beneficial to simplifying the sealing structure, and the sealing performance can be ensured by several sealing rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the objectives, technical solutions, and beneficial effects of the present utility model clearer, the present utility model provides the following drawings for illustration:

[0019] Figure 1 It is a cross-sectional structure schematic diagram of the present utility model;

[0020] Figure 2 It is a cross-sectional schematic diagram of the connection between the valve stem and the ball valve head of the present utility model.

[0021] The reference signs in the drawings are as follows:

[0022] 1 - Housing assembly, 11 - Housing body, 111 - Feed window, 112 - Cavity, 113 - First mounting ring groove, 114 - Second mounting ring groove, 115 - Third mounting ring groove, 12 - gland, 13 - Inner metal filter screen, 14 - Outer metal filter screen;

[0023] 2 - Solenoid valve assembly, 21 - Mounting skeleton, 22 - Electromagnetic coil, 23 - Iron core joint, 24 - Support ring, 25 - Aviation socket;

[0024] 3 - Elastic return element;

[0025] 4 - Spool assembly, 41 - Valve stem, 411 - Upper section, 412 - Middle section, 413 - Lower section, 42 - Guide and limit cylinder, 43 - Ball valve head;

[0026] 5 - Valve seat assembly, 51 - Valve seat body, 52 - Spray hole plate;

[0027] 6 - Bolt, 7 - Mask nut, 8a - First sealing ring, 8b - Second sealing ring, 8c - Third sealing ring, 8d - Fourth sealing ring. Detailed implementation mode

[0028] The technical solutions of the present utility model will be described in detail below with reference to the drawings and embodiments.

[0029] As Figure 1 - Figure 2 shown, a marine methanol injector in this embodiment includes a housing assembly 1, a solenoid valve assembly 2, an elastic return element 3, a spool assembly 4, and a valve seat assembly 5. A middle hole is provided inside the housing assembly 1, and the solenoid valve assembly 2, the elastic return element 3, the spool assembly 4, and the valve seat assembly 5 are arranged in the middle hole from top to bottom;

[0030] A plurality of feed windows 111 are circumferentially and spacedly arranged at the lower part of the housing assembly 1, and a cavity 112 communicating with the feed windows 111 is provided at the lower part of the middle hole; A filter screen is provided outside the housing assembly 1 corresponding to the position of the feed windows 111; The valve seat assembly 5 includes a valve seat body 51 and a spray hole plate 52 arranged on the lower side of the valve seat body 51, and spray holes communicating with the outside are provided on the spray hole plate 52;

[0031] The elastic return element 3 can make the spool assembly 4 abut against the valve seat assembly 5, so that the cavity 112 is not communicated with the spray holes on the spray hole plate 52; The solenoid valve assembly 2 can drive the spool assembly 4 to separate from the valve seat assembly 5, so that the cavity 112 is communicated with the spray holes on the spray hole plate 52.

[0032] During use, when the solenoid valve assembly 2 does not receive an electrical signal, the elastic return element 3 (which can be a spring) causes the valve core assembly 4 to tend to move downward, thereby ensuring that the valve core assembly 4 abuts against the valve seat assembly 5, preventing the methanol fuel in the cavity 112 from flowing to the nozzles on the nozzle plate 52. When the solenoid valve assembly 2 receives an electrical signal, an electromagnetic force is generated to attract the valve core assembly 4 to move upward, causing the valve core assembly 4 to separate from the valve seat assembly 5. The methanol fuel passes through the filter screen and enters the cavity 112 from the feed window 111, and finally sprays out from the nozzles on the nozzle plate 52.

[0033] Methanol fuel has a low viscosity, poor lubricity, and may contain impurities. The marine methanol injector provided in this embodiment filters the methanol fuel through a filter screen, which can reduce the impurities in the methanol fuel. The reduction of impurities can reduce the risk of nozzle blockage. By optimizing the layout of the housing assembly 1, the solenoid valve, the valve core assembly 4, and the valve seat assembly 5, the flow path of the methanol fuel is short, and the number of components it flows through is small, which can reduce the leakage probability. Moreover, the relatively concentrated methanol fuel is conducive to simplifying the sealing structure, and the sealing performance can be ensured by several sealing rings (such as the second sealing ring 8b, the third sealing ring 8c, and the fourth sealing ring 8d).

[0034] In this embodiment, a first installation ring groove 113 is provided on the outside of the housing assembly 1. The filter screen includes an inner layer metal filter screen 13 and an outer layer metal filter screen 14. The inner layer metal filter screen 13 is wound around the first installation ring groove 113 for one week and then welded end to end to form a ring. The outer layer metal filter screen 14 is wound around the inner layer metal filter screen 13 for one week and then welded end to end to form a ring.

[0035] Before installing the filter screen onto the housing assembly 1, check the inner layer metal filter screen 13 and the outer layer metal filter screen 14 to ensure there are no defects such as broken wires or pulled wires. Then, put components such as the housing body 11, the inner layer metal filter screen 13, and the outer layer metal filter screen 14 into a clean cleaning liquid for ultrasonic cleaning. After cleaning, take them out and blow them dry with dry compressed air. After the inner layer metal filter screen 13 is tightly wound around the housing cylinder, filler laser welding is used and the weld is firmly welded. The outer layer metal filter screen 14 is tightly wound around the inner layer filter screen, and the outer layer metal filter screen 14 is welded to the inner layer metal filter screen at the weld of the outer layer metal filter screen 14. Laser reinforcement welding is allowed at the weld of the inner layer metal filter screen 13 for the outer layer metal filter screen 14 to ensure that the inner and outer layers of metal filter screens do not fall off from each other.

[0036] In this embodiment, the welds at the head and tail joints of the inner metal filter screen 13 are staggered from the welds at the head and tail joints of the outer metal filter screen 14, and both the welds at the head and tail joints of the inner metal filter screen 13 and the welds at the head and tail joints of the outer metal filter screen 14 are staggered from the positions of each of the feed windows 111. The welds of the outer metal filter screen 14 and the inner metal filter screen 13 are staggered by 90° in the circumferential direction, further ensuring that the inner and outer metal filter screens do not fall off each other. Both welds avoid the feed windows 111 of the shell body 11 to prevent the welds from affecting the efficiency of methanol fuel entry.

[0037] In this embodiment, a second mounting ring groove 114 and a third mounting ring groove 115 are provided outside the housing assembly 1. The second mounting ring groove 114 and the third mounting ring groove 115 are respectively located above and below the first mounting ring groove 113, and first sealing rings 8a are installed in both the second mounting ring groove 114 and the third mounting ring groove 115.

[0038] The inner and outer metal filter screens and the two first sealing rings 8a respectively located on the upper and lower sides of the filter screens cooperate to form a sealed filter, and the two first sealing rings 8a can cooperate with the fuel supply mechanism to ensure the sealing performance at the methanol fuel inlet.

[0039] In this embodiment, the housing assembly 1 includes a gland 12 and a shell body 11; the solenoid valve assembly 2 includes a mounting skeleton 21, an electromagnetic coil 22, an iron core joint 23, a support ring 24, and a socket 25. An annular chamber is provided on the side of the mounting skeleton 21 facing the housing assembly 1. The electromagnetic coil 22 is wound in the annular chamber of the mounting skeleton 21. A through hole is provided in the middle of the mounting skeleton 21, and the lower part of the iron core joint 23 extends into the through hole. The support ring 24 is provided at the lower part of the iron core joint 23; the socket 25 is provided on the upper side of the shell body 11, and the socket 25 abuts against the outside of the gland 12.

[0040] The electromagnetic coil 22 is wound in the annular chamber of the mounting skeleton 21. The third sealing ring 8c is installed on the shell body 11, and then the mounting skeleton 21 is placed on the third sealing ring 8c, so that the third sealing ring 8c is located between the lower side of the support skeleton and the shell body 11. The socket 25 is installed on the upper side of the shell body 11, and then plastic encapsulation is carried out by means of high-pressure injection molding. After plastic encapsulation, it is necessary to ensure that the solenoid valve assembly 2 is firmly bonded in the shell body 11, and the phenomenon of the solenoid valve assembly 2 falling off the shell body 11 is not allowed.

[0041] The iron core joint 23 and the support ring 24 are heat vulcanized by a vulcanizing machine. During the vulcanization process, ensure the stable control of temperature, pressure, and time to ensure the full curing of the support ring 24 and the iron core joint 23. After cooling, when the temperature of the iron core joint 23 returns to normal temperature, clean the overflow glue and grind the surface of the iron core joint 23 to make the iron core joint 23 flat and smooth. After installing the fourth sealing ring 8d on the iron core joint 23, install the iron core joint 23 into the through hole of the installation skeleton 21.

[0042] In this embodiment, it further includes a plurality of bolts 6. A plurality of threaded holes are arranged at intervals along the circumference on the upper part of the shell body 11. The rod parts of the respective bolts 6 are connected to the respective threaded holes. The lower sides of the heads of the respective bolts 6 are simultaneously pressed against the aviation socket 25 and the gland 12. The upper side of the support skeleton is simultaneously abutted against the gland 12 and the aviation socket 25, and the lower side of the support skeleton is abutted against the shell body 11.

[0043] The head of the bolt 6 can simultaneously fixedly press the aviation plug and the gland 12, and the gland 12 presses and fixes the support skeleton.

[0044] In this embodiment, the valve core assembly 4 includes a valve rod 41, a guiding and limiting cylinder 42, and a ball valve head 43. The valve rod 41 includes an upper section 411, a middle section 412, and a lower section 413 arranged in sequence from top to bottom. The diameter of the upper section 411 is larger than that of the middle section 412, and the diameter of the middle section 412 is larger than that of the lower section 413. The guiding and limiting cylinder 42 is fixed on the shell body 11, and the guiding and limiting cylinder 42 is slidably matched with the middle section 412. A cavity 112 is formed between the lower section 413 and the shell body 11, and the lower section 413 is connected to the ball valve head 43.

[0045] The three segments with different diameters of the valve rod 41 have different functions respectively: the upper section 411 is used to cooperate with the elastic return element 3 and plays the roles of installation and force bearing; the shoulder surface between the upper section 411 and the middle section 412 can cooperate with the guiding and limiting cylinder 42 to play a limiting role; the middle section 412 is slidably matched with the guiding and limiting cylinder 42 to ensure that the movement direction of the valve rod 41 does not deviate; the lower section 413 is used to form the cavity 112 with the shell body 11, and the lower section 413 is also used to connect with the ball valve head 43 to drive the ball valve head 43 to move.

[0046] In this embodiment, an upper accommodation cavity is arranged on one side of the iron core joint 23 facing the upper section 411, and a lower accommodation cavity is arranged on one side of the upper section 411 facing the iron core joint 23. The upper part of the elastic return element 3 extends into the upper accommodation cavity and abuts against the iron core joint 23, and the lower part of the elastic return element 3 extends into the lower accommodation cavity and abuts against the upper section 411.

[0047] In this embodiment, a second sealing ring 8b is provided between the housing main body 11 and the valve seat body 51, a third sealing ring 8c is provided between the lower side of the support skeleton and the housing main body 11, and a fourth sealing ring 8d is provided between the through hole of the support skeleton and the iron core joint 23.

[0048] Through the combined action of the second sealing ring 8b, the third sealing ring 8c, and the fourth sealing ring 8d, methanol fuel leakage can be prevented and the sealing effect can be ensured.

[0049] In this embodiment, it further includes a mask nut 7. The mask nut 7 is located above the gland 12. The middle part of the iron core joint 23 is in threaded cooperation with the gland 12. The upper part of the iron core joint 23 extends upward out of the gland 12, and the upper part of the iron core joint 23 is in threaded cooperation with the mask nut 7.

[0050] Since the gland 12 is fixed, by rotating the iron core joint 23, the height position of the iron core joint 23 can be changed, thereby changing the upper limit movement position of the valve stem 41, that is, changing the lift of the valve stem 41. The mask nut 7 is an internal hexagonal nut and is used to mask the protruding part of the iron core joint 23.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A marine methanol injector, characterized in that: It includes a housing assembly (1), a solenoid valve assembly (2), an elastic return element (3), a valve core assembly (4), and a valve seat assembly (5). A middle hole is provided inside the housing assembly (1), and the solenoid valve assembly (2), the elastic return element (3), the valve core assembly (4), and the valve seat assembly (5) are arranged in the middle hole from top to bottom; A plurality of feed windows (111) are circumferentially and spacedly arranged at the lower part of the housing assembly (1), and a cavity (112) communicating with the feed windows (111) is provided at the lower part of the middle hole; A filter screen is provided outside the housing assembly (1) corresponding to the position of the feed windows (111). The valve seat assembly (5) includes a valve seat body (51) and a spray hole plate (52) arranged on the lower side of the valve seat body (51), and spray holes communicating with the outside are provided on the spray hole plate (52); The elastic return element (3) can make the valve core assembly (4) abut against the valve seat assembly (5) so that the cavity (112) is not communicated with the spray holes on the spray hole plate (52); The solenoid valve assembly (2) can drive the valve core assembly (4) to separate from the valve seat assembly (5) so that the cavity (112) is communicated with the spray holes on the spray hole plate (52).

2. The marine methanol injector according to claim 1, wherein: A first mounting ring groove (113) is provided outside the housing assembly (1). The filter screen includes an inner layer metal filter screen (13) and an outer layer metal filter screen (14). The inner layer metal filter screen (13) is wound around the first mounting ring groove (113) for one week and then formed into a ring by welding the head and the tail. The outer layer metal filter screen (14) is wound around the inner layer metal filter screen (13) for one week and then formed into a ring by welding the head and the tail.

3. The marine methanol injector according to claim 2, wherein: The weld at the head and tail welding of the inner layer metal filter screen (13) is staggered from the weld at the head and tail welding of the outer layer metal filter screen (14), and both the weld at the head and tail welding of the inner layer metal filter screen (13) and the weld at the head and tail welding of the outer layer metal filter screen (14) are staggered from the positions of the respective feed windows (111).

4. The marine methanol injector according to claim 2, wherein: A second mounting ring groove (114) and a third mounting ring groove (115) are provided outside the housing assembly (1). The second mounting ring groove (114) and the third mounting ring groove (115) are respectively located above and below the first mounting ring groove (113), and first sealing rings (8a) are installed in both the second mounting ring groove (114) and the third mounting ring groove (115).

5. The marine methanol injector according to claim 1, characterized in that: The housing assembly (1) includes a gland (12) and a housing body (11); the solenoid valve assembly (2) includes a mounting skeleton (21), an electromagnetic coil (22), an iron core joint (23), a support ring (24), and an aviation socket (25). An annular chamber is provided on one side of the mounting skeleton (21) facing the housing assembly (1). The electromagnetic coil (22) is wound in the annular chamber of the mounting skeleton (21). A through hole is provided in the middle of the mounting skeleton (21). The lower part of the iron core joint (23) extends into the through hole, and the support ring (24) is arranged at the lower part of the iron core joint (23); the aviation socket (25) is arranged on the upper side of the housing body (11), and the aviation socket (25) abuts against the outside of the gland (12).

6. The marine methanol injector according to claim 5, characterized in that: It further includes a plurality of bolts (6). A plurality of threaded holes are arranged at intervals along the circumference on the upper part of the housing body (11). The rod parts of the bolts (6) are connected to the threaded holes. The lower side surfaces of the heads of the bolts (6) simultaneously press on the aviation socket (25) and the gland (12). The upper side of the support skeleton simultaneously abuts against the gland (12) and the aviation socket (25), and the lower side of the support skeleton abuts against the housing body (11).

7. The marine methanol injector according to claim 6, wherein: The spool valve assembly (4) includes a valve rod (41), a guiding and limiting cylinder (42), and a ball valve head (43). The valve rod (41) includes an upper section (411), a middle section (412), and a lower section (413) arranged in sequence from top to bottom. The diameter of the upper section (411) is greater than that of the middle section (412), and the diameter of the middle section (412) is greater than that of the lower section (413); the guiding and limiting cylinder (42) is fixed on the housing body (11), and the guiding and limiting cylinder (42) is in sliding fit with the middle section (412); a cavity (112) is formed between the lower section (413) and the housing body (11), and the lower section (413) is connected to the ball valve head (43).

8. The marine methanol injector according to claim 7, characterized in that: An upper accommodation cavity is provided on one side of the iron core joint (23) facing the upper section (411), and a lower accommodation cavity is provided on one side of the upper section (411) facing the iron core joint (23). The upper part of the elastic return element (3) extends into the upper accommodation cavity and abuts against the iron core joint (23), and the lower part of the elastic return element (3) extends into the lower accommodation cavity and abuts against the upper section (x411).

9. The marine methanol injector according to claim 8, characterized in that: A second sealing ring (8b) is provided between the housing body (11) and the valve seat body (51), a third sealing ring (8c) is provided between the lower side of the support skeleton and the housing body (11), and a fourth sealing ring (8d) is provided between the through hole of the support skeleton and the iron core joint (23).

10. The marine methanol injector according to claim 5, wherein: It further includes a masking nut (7), the masking nut (7) is located above the gland (12), the middle part of the iron core joint (23) is in threaded fit with the gland (12), the upper part of the iron core joint (23) extends upward out of the gland (12), and the upper part of the iron core joint (23) is in threaded fit with the masking nut (7).

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