Electrically-driven gas fuel injector

Abstract

The invention provides an electrically-driven gas fuel injector. The electrically-driven gas fuel injector comprises a hydraulic cavity, an air pressure cavity and a motor. The air pressure cavity is connected with the motor through the hydraulic cavity, and a threaded disc and an air valve are arranged between the air pressure cavity and the hydraulic cavity. The threaded disc is connected with the output end of the motor, one end of the air valve is connected with the threaded disc, and the other end of the air valve penetrates through the hydraulic cavity to plug a port of the air pressure cavity. The rotation of the threaded disc can realize the movement of the air valve so as to realize the opening and closing of the air pressure cavity; a bearing positioning plate, a bearing sliding plate and an axial bearing are arranged in the hydraulic cavity; the air pressure cavity is connected with the hydraulic cavity through a sealing gasket. The device can be suitable for various gas fuels, is high in reliability, and can maintain a long service life; and meanwhile, an electric driving mode is adopted, the principle is simple, the structure of the hydraulic cavity is greatly simplified, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of fuel injectors, and particularly relates to an electric-driven gas fuel injector. Background Art

[0002] Currently, commonly used gas fuel injectors are often modified from liquid fuel injectors. However, the structure of the needle valve in a liquid fuel injector can be lubricated by the liquid fuel to maintain long-term functionality. In a gas fuel injector, there is no liquid, and without lubrication during operation, wear will occur due to long-term collisions and friction, ultimately affecting the overall functionality and service life of the injector. Therefore, it is desired to separate the process of liquid lubrication and gas injection in the injector, so that the parts subjected to long-term friction and collision can be lubricated by the liquid, while also enabling the injection of gas fuel. Summary of the Invention

[0003] In view of this, the present invention aims to provide an electric-driven gas fuel injector to solve problems such as the existing gas fuel injector lacking lubrication during operation, experiencing wear due to long-term collisions and friction, ultimately affecting the overall functionality and service life of the injector, and at the same time exploring the possibility of electric drive.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows: An electric-driven gas fuel injector includes a hydraulic cavity, a pneumatic cavity, and a motor; The pneumatic cavity is connected to the motor through the hydraulic cavity. A threaded disc and a gas valve are provided between the pneumatic cavity and the hydraulic cavity. The threaded disc is connected to the output end of the motor. One end of the gas valve is connected to the threaded disc, and the other end passes through the hydraulic cavity to block the port of the pneumatic cavity. Rotation of the threaded disc can cause the movement of the gas valve, thereby achieving the opening and closing of the pneumatic cavity; A bearing positioning plate, a bearing sliding plate, and an axial bearing are provided in the hydraulic cavity; The pneumatic cavity is connected to the hydraulic cavity through a gasket.

[0005] Further, the main body of the hydraulic cavity is a hydraulic chamber. An oil inlet passage and an oil return passage communicating with the inside are provided on the left and right sides of the hydraulic chamber. Below the hydraulic chamber are a liquid-side sealing plate and a circular liquid-side sealing wall surface. A circular through-hole is provided in the center of the liquid-side sealing plate as the gas valve column sealing hole.

[0006] Further, the main body of the pneumatic cavity is a pneumatic chamber. An air inlet passage and an air return passage are communicated on both sides of the pneumatic chamber. Above the pneumatic chamber are a gas-side sealing plate and a circular gas-side sealing wall surface. A circular through-hole is provided in the center of the gas-side sealing plate as the gas valve column installation hole; Below the air pressure chamber is a gas nozzle with a chamfer; the gas side sealing wall is installed and fastened in the liquid side sealing wall, and the plane where the oil inlet channel and the oil return channel are located is staggered with the plane where the air inlet channel and the air return channel are located.

[0007] Furthermore, the sealing gasket is cylindrical as a whole, with a circular through hole in the center as the sealing gasket sealing hole; the sealing gasket is installed in the sealing wall surface on the air inlet side, and is sandwiched between the air side sealing plate and the liquid side sealing plate.

[0008] Furthermore, the bearing positioning plate is disc-shaped as a whole, with a circular through hole in the center; an annular groove is coaxially arranged on the top surface of the bearing positioning plate, which is the bearing positioning groove, and the cross-section of the bearing positioning groove is an arc shape; the bearing positioning plate is installed in the hydraulic cavity, and the bottom surface is fitted and fastened to the liquid side sealing plate.

[0009] Furthermore, the axial bearing is composed of a bearing plate and a bearing roller; the bearing plate is in the shape of a disk with a through hole in the center, and a plurality of spherical holes are coaxially arranged around the through hole; a plurality of spherical bearing rollers are installed in the spherical holes and roll therein to form the axial bearing; The individual bearing rollers on the axial bearing can be coaxially placed in the bearing locating groove and roll therein.

[0010] Furthermore, the bearing sliding plate is disc-shaped as a whole with a circular through hole in the center; a number of identical countersunk holes are arranged on the top surface of the bearing sliding plate along the outer edge of the circumference, which are threaded disk positioning holes; an annular groove is coaxially arranged on the bottom surface of the bearing sliding plate, which is a bearing sliding groove, and the cross-section of the bearing sliding groove is an arc shape; the outer diameter of the bearing sliding plate is smaller than the hydraulic chamber, and the bearing sliding groove on its bottom surface is coaxially and tangentially installed with each bearing roller on the axial bearing, and the bearing sliding plate rotates on the axial bearing.

[0011] Furthermore, the threaded disk is cylindrical as a whole, and a cubic countersunk hole is provided in the center of the top surface, which is the motor shaft mounting hole; a trapezoidal threaded hole is provided in the center of the threaded disk along the axis, and the distribution length is greater than the distribution length of the trapezoidal thread on the threaded column of the air valve; a limit plate is provided below the trapezoidal threaded hole, and a circular through hole is provided in the center of the limit plate as the limiting column mounting hole, and the aperture of the limiting column mounting hole is smaller than the trapezoidal threaded hole; A number of identical bearing positioning columns are arranged along the outer edge of the circumference of the bottom surface of the limit plate; the bearing positioning columns are installed into the positioning holes of the threaded disk and tightened so that the bottom surface of the limit plate fits the top surface of the bearing sliding plate, and the threaded disk and the bearing sliding plate can rotate together on the axial bearing.

[0012] Furthermore, the motor is cylindrical as a whole, and has a cubic columnar structure in the center of the bottom surface as the motor shaft; the motor shaft can rotate clockwise or counterclockwise under the control of the ECU; the motor shaft is installed in the motor shaft mounting hole and fastened, and the motor drives the motor shaft and the threaded disk to rotate, and the bottom surface of the motor is sealed against the top surface of the hydraulic chamber.

[0013] Furthermore, the air valve consists of four parts from bottom to top, namely an air valve disc, an air valve column, a limiting column, and a threaded column; the air valve disc is conical; the air valve column and the limiting column are cylindrical, and the threaded column is provided with trapezoidal threads; the air valve column is installed in the air valve column installation hole, the gasket sealing hole, and the air valve column sealing hole and can slide therein; the central through holes of the bearing sliding plate, the axial bearing, and the bearing positioning plate do not contact the air valve; the limiting column is exactly installed in the limiting column installation hole and can slide therein; the threaded column is installed in the trapezoidal thread hole, and when the threaded column is at the upper limit position of the trapezoidal thread hole, the air valve disc fits and seals with the chamfer of the gas nozzle; when the threaded column is at the lower limit position of the trapezoidal thread hole, a limiting plate prevents its movement.

[0014] Compared with the prior art, the electric-driven gas fuel injector of the present invention has the following advantages: (1) For the electric-driven gas fuel injector of the present invention, the processes of liquid lubrication and gas injection in the injector are separated. It can not only lubricate the parts that are subject to long-term friction and collision with liquid, but also realize the injection of gas fuel. This gas fuel injector can be applicable to a variety of gas fuels, has high reliability, and can maintain a long service life.

[0015] (2) For the electric-driven gas fuel injector of the present invention, the electric-driven method is used, and the principle is simple, which greatly simplifies the structure of the hydraulic cavity and reduces the manufacturing cost. Description of the Drawings

[0016] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is an oblique view of the overall structure of the electric-driven gas fuel injector of the present invention; Figure 2 is a sectional view of the electric-driven gas fuel injector of the present invention along the plane of the inlet and return oil channels; Figure 3 is a sectional view of the electric-driven gas fuel injector of the present invention along the plane of the inlet and return air channels; Figure 4 is an oblique view of the hydraulic cavity of the electric-driven gas fuel injector of the present invention; Figure 5 is an oblique sectional view of the hydraulic cavity of the electric-driven gas fuel injector of the present invention; Figure 6 is a sectional view of the hydraulic cavity of the electric-driven gas fuel injector of the present invention; Figure 7Oblique cross-sectional view of the bearing positioning plate of an electric-driven gas fuel injector according to the present invention; Figure 8 Cross-sectional view of the bearing positioning plate of an electric-driven gas fuel injector according to the present invention; Figure 9 Oblique cross-sectional view of the axial bearing of an electric-driven gas fuel injector according to the present invention; Figure 10 Oblique cross-sectional view of the bearing plate of an electric-driven gas fuel injector according to the present invention; Figure 11 Cross-sectional view of the bearing plate of an electric-driven gas fuel injector according to the present invention; Figure 12 Oblique view of the bearing sliding plate of an electric-driven gas fuel injector according to the present invention; Figure 13 Oblique cross-sectional view (upper) of the bearing sliding plate of an electric-driven gas fuel injector according to the present invention; Figure 14 Oblique view (lower) of the bearing sliding plate of an electric-driven gas fuel injector according to the present invention; Figure 15 Cross-sectional view of the bearing sliding plate of an electric-driven gas fuel injector according to the present invention; Figure 16 Oblique view (upper) of the threaded disk of an electric-driven gas fuel injector according to the present invention; Figure 17 Oblique view (lower) of the threaded disk of an electric-driven gas fuel injector according to the present invention; Figure 18 Oblique cross-sectional view (upper) of the threaded disk of an electric-driven gas fuel injector according to the present invention; Figure 19 Oblique cross-sectional view (lower) of the threaded disk of an electric-driven gas fuel injector according to the present invention; Figure 20 Cross-sectional view of the threaded disk of an electric-driven gas fuel injector according to the present invention; Figure 21 Oblique view of the air pressure cavity of an electric-driven gas fuel injector according to the present invention; Figure 22 Oblique cross-sectional view of the air pressure cavity of an electric-driven gas fuel injector according to the present invention; Figure 23 Cross-sectional view of the air pressure cavity of an electric-driven gas fuel injector according to the present invention; Figure 24Schematic diagram of the motor of a gas fuel injector driven by electricity according to the present invention; Figure 25 Oblique view of the gas valve of a gas fuel injector driven by electricity according to the present invention; Figure 26 Oblique sectional view of the gas valve of a gas fuel injector driven by electricity according to the present invention; Figure 27 Perspective view of the gasket structure of a gas fuel injector driven by electricity according to the present invention.

[0017] Description of reference numerals: 1 - hydraulic cavity; 11 - hydraulic chamber; 12 - oil inlet passage; 13 - oil return passage; 14 - liquid - side sealing plate; 141 - valve post sealing hole; 15 - liquid - side sealing wall surface; 2 - pneumatic cavity; 21 - pneumatic chamber; 22 - air inlet passage; 23 - air return passage; 24 - gas - side sealing plate; 241 - valve post mounting hole; 25 - gas - side sealing wall surface; 26 - gas nozzle; 3 - gas valve; 31 - valve disc; 32 - valve post; 33 - limiting post; 34 - threaded post; 4 - gasket; 41 - gasket sealing hole; 5 - bearing positioning plate; 51 - bearing positioning groove; 6 - bearing sliding plate; 61 - threaded disc positioning hole; 62 - bearing sliding groove; 7 - axial bearing; 71 - bearing plate; 711 - spherical hole; 72 - bearing roller; 8 - threaded disc; 81 - motor shaft mounting hole; 82 - trapezoidal threaded hole; 83 - limiting plate; 831 - limiting post mounting hole; 84 - bearing positioning post; 9 - motor; 91 - motor shaft. Detailed implementation manners

[0018] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0022] A gas fuel injector driven by electricity, as Figure 1 , Figure 2 and Figure 3 shown; it includes a hydraulic cavity, a pneumatic cavity, and an electric motor; The pneumatic cavity is connected to the electric motor through the hydraulic cavity. A threaded disk and a gas valve are provided between the pneumatic cavity and the hydraulic cavity; the threaded disk is connected to the output end of the electric motor, one end of the gas valve is connected to the threaded disk, and the other end passes through the hydraulic cavity to block the port of the pneumatic cavity; the rotation of the threaded disk can cause the movement of the gas valve, thereby realizing the opening and closing of the pneumatic cavity; a bearing positioning plate, a bearing sliding plate, and an axial bearing are provided in the hydraulic cavity. The pneumatic cavity is connected to the hydraulic cavity through a gasket.

[0023] As Figure 4 , Figure 5 and Figure 6 shown, the main body of the hydraulic cavity 1 is the hydraulic chamber 11. The left and right sides of the hydraulic chamber 11 are connected to an oil inlet passage 12 and an oil return passage 13. Below the hydraulic chamber 11 is a liquid-side sealing plate 14 and an annular liquid-side sealing wall surface 15. There is a circular through-hole in the center of the liquid-side sealing plate 14, which is the gas valve column sealing hole 141; As Figure 7 , Figure 8 shown, the bearing positioning plate 5 is integrally disc-shaped and has a circular through-hole in the center; an annular groove is coaxially provided on the top surface of the bearing positioning plate 5, which is the bearing positioning groove 51, and the cross-section of the bearing positioning groove 51 is arc-shaped; the bearing positioning plate 5 is just installed into the hydraulic chamber 11, and the bottom surface is tightly attached to the liquid-side sealing plate 14; the bearing positioning plate is fixed in the hydraulic chamber and does not move its position. The bearing positioning groove on it provides a track for the axial bearing to rotate axially.

[0024] As Figure 9 , Figure 10 and Figure 11As shown, the axial bearing 7 is composed of a bearing plate 71 and bearing rollers 72; the bearing plate 71 is generally in the shape of a disc with a central through-hole, and a number of spherical holes 711 are coaxially arranged around the through-hole; a number of spherical bearing rollers 72 can be exactly installed into the spherical holes 711 and roll therein to form the axial bearing 7; the outer diameter of the bearing plate 71 is smaller than that of the hydraulic cavity 11, and each bearing roller 72 on the axial bearing 7 can be exactly coaxially placed into the bearing positioning groove 51 and roll therein.

[0025] As Figure 12 , Figure 13 , Figure 14 and Figure 15 shown, the bearing sliding plate 6 is generally in the shape of a disc with a circular through-hole in the center; on the top surface of the bearing sliding plate 6, a number of identical counterbores are arranged along the circumferential outer edge, which are the threaded disc positioning holes 61; on the bottom surface of the bearing sliding plate 6, an annular groove is coaxially arranged, which is the bearing sliding groove 62, and the cross-section of the bearing sliding groove 62 is arc-shaped; the outer diameter of the bearing sliding plate 6 is smaller than that of the hydraulic cavity 11, and the bearing sliding groove 62 on its bottom surface is exactly coaxially tangent to each bearing roller 72 on the axial bearing 7 for installation, and the bearing sliding plate 6 can rotate around a fixed axis on the axial bearing 7.

[0026] As Figure 16 , Figure 17 , Figure 18 , Figure 19 and Figure 20 shown, the threaded disc 8 is generally in the shape of a cylinder, and a counterbore in the shape of a cube is provided in the center of the top surface, which is the motor shaft installation hole 81; a limiting plate 83 is arranged below the trapezoidal threaded hole 82, and a circular through-hole is provided in the center of the limiting plate 83, which is the limiting column installation hole 831, and the diameter of the limiting column installation hole 831 is smaller than that of the trapezoidal threaded hole 82; a number of identical bearing positioning columns 84 are arranged along the circumferential outer edge of the bottom surface of the limiting plate 83; the bearing positioning columns 84 can be exactly installed into the threaded disc positioning holes 61 for fastening, so that the bottom surface of the limiting plate 83 fits the top surface of the bearing sliding plate 6, and then the threaded disc 8 can rotate around a fixed axis on the axial bearing 7 together with the bearing sliding plate 6.

[0027] As Figure 21 , Figure 22 and Figure 23 shown, the main body of the pneumatic cavity 2 is a pneumatic cavity 21, and an air inlet passage 22 and an air return passage 23 are communicated on both sides of the pneumatic cavity 21; above the pneumatic cavity 21 are a gas-side sealing plate 24 and an annular gas-side sealing wall surface 25; a circular through-hole is provided in the center of the gas-side sealing plate 24, which is the gas valve column installation hole 241; below the pneumatic cavity 21 is a gas nozzle 26 with a chamfer; the gas-side sealing wall surface 25 is exactly installed and fastened into the liquid-side sealing wall surface 15, and the planes where the oil inlet passage 12 and the oil return passage 13 are located are staggered from the planes where the air inlet passage 22 and the air return passage 23 are located.

[0028] As Figure 24As shown, the motor 9 is generally cylindrical in shape. In the center of the bottom surface, there is a cubic columnar structure, which is the motor shaft 91. The motor shaft 91 can rotate a certain angle clockwise or counterclockwise under the control of the ECU. The motor shaft 91 can be installed and fastened in the motor shaft mounting hole 81, and the motor 9 drives the motor shaft 91 and the threaded disk 8 to rotate. The bottom surface of the motor 9 is attached to the top surface of the hydraulic chamber 11 for sealing.

[0029] As Figure 25 and Figure 26 shown, the air valve 3 consists of four parts from bottom to top: an air valve disk 31, an air valve column 32, a limiting column 33, and a threaded column 34. The air valve disk 31 is conical. A trapezoidal threaded hole 82 is arranged along the axis in the center of the threaded disk 8, and the distribution length is greater than the trapezoidal thread distribution length on the threaded column 34 of the air valve 3. The threaded column 34 is installed in the trapezoidal threaded hole 82. When the threaded column 34 is at the upper limit position of the trapezoidal threaded hole 82, the air valve disk 31 fits and seals with the chamfer of the gas nozzle 26; when the motor rotates a certain angle under the control of the ECU to drive the motor shaft and the threaded disk, the threaded column in the threaded disk generates a relative rotational movement, and the air valve moves downward as a whole, and the air valve disk leaves the gas nozzle, then the gaseous fuel entering the pressure chamber from the air inlet is ejected from the gas nozzle; when the motor rotates a corresponding angle in the opposite direction under the control of the ECU to drive the motor shaft and the threaded disk, the threaded disk and the threaded column return to their original positions, the air valve moves upward, and the air valve disk 31 fits and seals with the chamfer of the gas nozzle 26, terminating the gas injection process, and the gaseous fuel entering the pressure chamber from the air inlet duct flows back to the gas tank through the air return duct. Thus, the gas injection process in the pressure chamber is completed.

[0030] The limiting column 33 is cylindrical, and the diameter of the limiting column 33 is smaller than that of the air valve column 32; the diameter of the threaded column 34 is larger than that of the limiting column 33, and trapezoidal threads are arranged thereon; the limiting column 33 is exactly installed in the limiting column mounting hole 831 and can slide therein. When the threaded column 34 is at the lower limit position of the trapezoidal threaded hole 82, a limiting plate 83 prevents it from further moving. Even if the motor rotates an excessive angle, the air valve will not overextend and cause a failure, but only the air valve will rotate following the threaded disk.

[0031] As Figure 27As shown, the gasket 4 is integrally cylindrical, with a circular through-hole in the center as the gasket sealing hole 41; the gasket 4 is exactly installed in the intake-side sealing wall surface 25, sandwiched between the gas-side sealing plate 24 and the liquid-side sealing plate 14; the gas valve column 32 is cylindrical, and the gas valve column 32 is exactly installed in the gas valve column installation hole 241, the gasket sealing hole 41 and the gas valve column sealing hole 141 and can slide therein. The central through-holes of the bearing sliding plate 6, the axial bearing 7 and the bearing positioning plate 5 do not contact the gas valve 3. Thus, the lubrication process in the hydraulic chamber and the gas injection process in the pneumatic chamber do not interfere with each other. The lubricating oil enters the hydraulic chamber from the oil inlet passage, lubricates the friction surfaces of moving parts such as the axial bearing, the threaded disc, the motor shaft and the gas valve, and flows back to the fuel tank from the oil return passage, realizing the lubrication process in the hydraulic chamber.

[0032] Working principle, When the motor rotates the motor shaft and the threaded disc by a certain angle under the control of the ECU, the threaded posts in the threaded disc generate relative rotational motion, and the gas valve moves downward as a whole, and the gas valve disc leaves the gas nozzle, then the gaseous fuel entering the pneumatic chamber from the air inlet is ejected from the gas nozzle; when the motor rotates the motor shaft and the threaded disc in the opposite direction by the corresponding angle under the control of the ECU, the threaded disc and the threaded posts return to their original positions, the gas valve moves upward and the gas valve disc 31 fits and seals with the chamfer of the gas nozzle 26, terminating the gas injection process, and the gaseous fuel entering the pneumatic chamber from the air inlet passage flows back to the gas tank through the air return passage. Thus, the gas injection process in the pneumatic chamber is completed.

[0033] When the threaded post 34 is at the lower limit position of the trapezoidal threaded hole 82, the limiting plate 83 prevents it from further moving. Even if the motor rotates by an excessive angle, the gas valve will not overextend and cause a failure, but only the gas valve will rotate following the threaded disc.

[0034] The lubrication process in the hydraulic chamber and the gas injection process in the pneumatic chamber do not interfere with each other. The lubricating oil enters the hydraulic chamber from the oil inlet passage, lubricates the friction surfaces of moving parts such as the axial bearing, the threaded disc, the motor shaft and the gas valve, and flows back to the fuel tank from the oil return passage, realizing the lubrication process in the hydraulic chamber. Thus, the description of the function realization process of an electric-driven gas fuel injector is completed.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric-powered gas fuel injector, characterized in that: It includes a hydraulic chamber, a pneumatic chamber and a motor; The pneumatic cavity is connected to the motor through the hydraulic cavity, and a threaded disc and an air valve are provided between the pneumatic cavity and the hydraulic cavity; the threaded disc is connected to the output end of the motor, one end of the air valve is connected to the threaded disc, and the other end passes through the hydraulic cavity to achieve blocking of the port of the pneumatic cavity; the rotation of the threaded disc can achieve movement of the air valve, thereby achieving opening and closing of the pneumatic cavity; The hydraulic cavity is provided with a bearing positioning plate, a bearing sliding plate and an axial bearing; The air pressure cavity is connected to the hydraulic cavity through a sealing gasket.

2. The gas fuel injector driven by electricity according to claim 1, wherein: The main body of the hydraulic cavity is a hydraulic cavity, and the left and right sides of the hydraulic cavity are provided with an oil inlet channel and an oil return channel connected to the inside; below the hydraulic cavity is a liquid side sealing plate and an annular liquid side sealing wall, and a circular through hole is provided in the center of the liquid side sealing plate as a valve column sealing hole.

3. The gas fuel injector driven by electricity according to claim 2, wherein: The main body of the air pressure cavity is an air pressure cavity, and the two sides of the air pressure cavity are connected to the air inlet and the air return duct; the upper part of the air pressure cavity is an air side sealing plate and an annular air side sealing wall; a circular through hole is provided in the center of the air side sealing plate as a mounting hole for the air valve column; Below the air pressure chamber is a gas nozzle with a chamfer; the gas side sealing wall is installed and fastened in the liquid side sealing wall, and the plane where the oil inlet channel and the oil return channel are located is staggered with the plane where the air inlet channel and the air return channel are located.

4. A power-driven gas fuel injector according to claim 3, characterized in that: The sealing gasket is cylindrical in shape as a whole, and a circular through hole is opened in the center as the sealing hole of the sealing gasket; the sealing gasket is installed in the sealing wall surface on the air inlet side, and is sandwiched between the air side sealing plate and the liquid side sealing plate.

5. A power-driven gas fuel injector according to claim 2, characterized in that: The bearing positioning plate is disc-shaped as a whole, with a circular through hole in the center; an annular groove is coaxially arranged on the top surface of the bearing positioning plate, which is the bearing positioning groove, and the cross-section of the bearing positioning groove is an arc shape; the bearing positioning plate is installed in the hydraulic cavity, and the bottom surface is fitted and fastened to the liquid side sealing plate.

6. The gas fuel injector driven by electricity according to claim 5, characterized in that: The axial bearing is composed of a bearing plate and bearing rollers; the bearing plate is in the shape of a disk with a through hole in the center, and a plurality of spherical holes are coaxially arranged around the through hole; a plurality of spherical bearing rollers are installed in the spherical holes and roll therein to form the axial bearing; The individual bearing rollers on the axial bearing can be coaxially placed in the bearing locating groove and roll therein.

7. A gas fuel injector driven by electricity according to claim 6, characterized in that: The bearing sliding plate is disc-shaped as a whole, with a circular through hole in the center; a number of identical countersunk holes are arranged along the outer edge of the circumference on the top surface of the bearing sliding plate, which are threaded disk positioning holes; an annular groove is coaxially arranged on the bottom surface of the bearing sliding plate, which is a bearing sliding groove, and the cross-section of the bearing sliding groove is an arc shape; the outer diameter of the bearing sliding plate is smaller than the hydraulic cavity, and the bearing sliding groove on its bottom surface is coaxially and tangentially installed with each bearing roller on the axial bearing, and the bearing sliding plate rotates on the axial bearing.

8. An electrically-driven gaseous fuel injector according to claim 7, wherein: The threaded disk is cylindrical in shape as a whole, and a cubic countersunk hole is provided in the center of the top surface, which is the motor shaft mounting hole; a trapezoidal threaded hole is provided in the center of the threaded disk along the axis, and the distribution length is greater than the distribution length of the trapezoidal thread on the threaded column of the air valve; a limit plate is provided below the trapezoidal threaded hole, and a circular through hole is provided in the center of the limit plate as the limiting column mounting hole, and the aperture of the limiting column mounting hole is smaller than the trapezoidal threaded hole; A number of identical bearing positioning posts are arranged along the circumferential outer edge of the bottom surface of the limiting plate; the bearing positioning posts are installed and fastened into the positioning holes of the threaded disc, so that the bottom surface of the limiting plate fits against the top surface of the bearing sliding plate, and then the threaded disc and the bearing sliding plate can rotate coaxially on the axial bearing.

9. An electrically driven gaseous fuel injector according to claim 8, characterized in that: The whole motor is cylindrical, and a cubic columnar structure is provided at the center of the bottom surface as the motor shaft; the motor shaft can rotate clockwise or counterclockwise under the control of the ECU; the motor shaft is installed and fastened into the motor shaft installation hole, and the motor drives the motor shaft and the threaded disc to rotate, and the bottom surface of the motor fits against the top surface of the hydraulic cavity for sealing.

10. The gas fuel injector driven by electricity according to claim 3, wherein: The air valve consists of four parts from bottom to top, namely an air valve disc, an air valve column, a limiting column and a threaded column; the air valve disc is conical; the air valve column and the limiting column are cylindrical, and trapezoidal threads are arranged on the threaded column; the air valve column is installed in the air valve column installation hole, the gasket sealing hole and the air valve column sealing hole and can slide therein; the central through holes of the bearing sliding plate, the axial bearing and the bearing positioning plate do not contact the air valve; the limiting column is exactly installed in the limiting column installation hole and can slide therein; the threaded column is installed in the trapezoidal thread hole, and when the threaded column is at the upper limit position of the trapezoidal thread hole, the air valve disc fits against the chamfer of the gas nozzle for sealing; when the threaded column is at the lower limit position of the trapezoidal thread hole, the limiting plate prevents its movement.

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