Long-life, high-precision digitally controlled gas injection valve

Abstract

The application provides a long-life and high-precision digital control gas injection valve, which comprises a valve seat, a valve core cavity is arranged at one end of the valve seat, an armature assembly is installed in the valve core cavity, a gasket is arranged at an opening of the valve core cavity, an electromagnetic assembly is installed on an outer wall of one end of a pole shoe, the electromagnetic assembly is pressed on an end surface of the gasket, and the coil assembly, the pole shoe and the valve seat are welded and fixed into an integrated body through a plastic sealing shell. The application adopts double S-shaped elastic sheets to perform floating support, adopts engineering plastic to perform magnetic isolation between the armature and the valve body, and adopts engineering plastic to perform damping and sealing between the valve seat and the baffle. In this way, the friction between the armature and the armature tube is eliminated, the impact between the armature and the pole shoe and between the baffle and the valve seat is reduced, the response speed of the injection valve is improved, the impact condition is improved, and thus the control precision of the injection valve is improved, and the service life of the injection valve is prolonged.

Description

Technical Field

[0001] This invention relates to a long-life, high-precision digitally controlled gas injection valve for gas engines. Background Technology

[0002] Due to the abundance and low price of resources such as natural gas, liquefied petroleum gas (LPG), hydrogen, and ammonia, an increasing number of vehicles are using these fuels as alternative fuels. In gas engines that use natural gas, LPG, hydrogen, or ammonia as fuel, the fuel supply is typically achieved through an electronically controlled fuel injection system. The fuel injection valve uses a PWM (Pulse Width Modulation) digital control method, adjusting the gas flow to the engine by controlling its on / off time according to commands from the electronic controller.

[0003] To improve its control accuracy, this PWM control method requires a high operating frequency. To meet the requirement of 300,000 kilometers of trouble-free operation for vehicles, the gas injection valve must have fast response speed, good operational stability, and long service life.

[0004] While current gas injection valves used in gas engines can initially meet response speed requirements, the lack of lubrication from gas leads to issues such as sliding friction in the valve core and impact between the valve core and seat, preventing stable long-term operation. To increase valve core lifespan, a gas injection valve structure disclosed in publication number CN114033578A uses a flat spring to float the valve core between the valve seat, eliminating friction between the valve core and valve body and extending valve core lifespan. However, the large distance between the fulcrum of the flat return spring and the fulcrum of the support spring results in poor stability, causing the armature assembly to tilt during movement. This leads to friction between the armature and the housing, further tilting the armature and potentially causing the spring to break, severely impacting the lifespan of the injection valve. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a long-life, high-precision digitally controlled gas injection valve.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a long-life, high-precision digital control gas injection valve, comprising a valve seat, an armature assembly, an electromagnetic assembly, and a pole shoe; the armature assembly is installed inside the valve seat by means of a gasket fixed at its opening, the inner side of the electromagnetic assembly is fixed to the outer circular surface of one end of the pole shoe, the side of the electromagnetic assembly is fixed to the gasket, and the electromagnetic assembly, the pole shoe, and the valve seat are provided with a plastic-encapsulated shell. The pole shoe, armature assembly, and valve seat form a channel that penetrates the injection valve; The pole shoe is equipped with a spring-loaded armature assembly to seal the channel inside the valve seat. The outer wall of the plastic-encapsulated housing is provided with a wiring plug for connection to the electromagnetic component.

[0008] The armature assembly includes a baffle and an armature. The baffle is connected by a connecting cylinder and an exhaust baffle. A connecting cavity is machined in the center of the armature. The end of the connecting cylinder is welded into the connecting cavity. Two S-shaped spring pieces are installed on the outer wall of the connecting cylinder between the armature and the exhaust baffle. A limiting ring is in contact with the inner side of each of the two S-shaped spring pieces. The outer ends of the two limiting rings are connected and fixed by a support ring. Several exhaust holes are uniformly machined on the side wall of the connecting cylinder between the two S-shaped spring pieces. The air outlet baffle is also machined with a dovetail groove, and a sealing gasket made of engineering plastic is installed in the dovetail groove.

[0009] The armature center is also machined with a limiting hole and a spring hole. The two ends of the limiting hole are connected to the connecting cavity and the spring hole respectively to form a stepped hole with large ends. The spring hole is assembled with one end of the spring.

[0010] The armature has a raised pressure ring in the middle that contacts the S-shaped spring, and the edge of the armature is machined with a weight reduction groove. The dovetail annular groove on the end face of the armature away from the baffle is provided with a buffer pad made of engineering plastic.

[0011] When the S-shaped spring is not deformed, the gaps between the sealing gasket and the buffer gasket and the valve seat and the pole shoe are equal, respectively.

[0012] The valve seat has a first air outlet channel, a second air outlet channel, a third air outlet channel, an armature movable cavity, an armature assembly mounting slot, and a gasket mounting slot sequentially machined along its center line. The armature movable cavity, armature assembly mounting slot, and gasket mounting slot form a continuous stepped hole. The edges of the two S-shaped springs in the armature assembly are installed in the armature assembly mounting slot, and the edges of the gasket are installed in the gasket mounting slot. The armature movable cavity is trapezoidal. Two anti-disengagement grooves are machined on the outer wall of the valve seat, and one end of the plastic-sealed shell is embedded into these grooves through injection molding. An outlet sealing ring is also installed at the end of the outer wall of the valve seat.

[0013] The diameters of the first and third air outlet channels are larger than the diameter of the second air outlet channel, and a sealing ring with a protrusion along its centerline is machined at the connection between the armature movable cavity and the third air outlet channel.

[0014] The electromagnetic component has a first air intake channel, a second air intake channel, a third air intake channel, and a fourth air intake channel machined sequentially at its center. The diameters of the first and third air intake channels are both larger than that of the second air intake channel and are respectively connected by a first conical channel and a second conical channel. A cylindrical pin is welded to one end of the second air intake channel to support the spring installed inside.

[0015] The electromagnetic component includes a coil. The inner side and both ends of the coil are supported by an "I"-shaped coil frame. The outer side of the coil and one side of the coil frame are wrapped by an "L"-shaped coil cover. One end of the coil cover and the other side of the coil frame are in contact with the edge of the pad. The inner ring of the coil frame and the other end of the coil cover are tightly fitted to the outer wall of the pole shoe. An "L"-shaped armature tube is provided between the side of the coil frame adjacent to the pad and the pole shoe. The two ends of the armature tube are welded to the pad and the pole shoe, respectively.

[0016] One end of the plastic-encapsulated housing is locked in the anti-disengagement groove on the outer wall of the valve seat, and the other end is locked in the second anti-disengagement groove on the outer wall of the pole shoe. The middle part of the plastic-encapsulated housing contacts the coil through the through hole machined on the coil cover. The side wall of the plastic-encapsulated housing is also provided with a connector protective sleeve, and the wiring plug is located in the circular groove machined at the outer end of the connector protective sleeve.

[0017] The beneficial effects of this invention are as follows: the use of double S-shaped spring sheets for floating support and the action point of the return spring extending deep into the armature improves the stability of the armature assembly movement, eliminates friction between the armature and the armature tube, and uses engineering plastics for magnetic isolation between the armature and the pole shoe, and uses engineering plastics for vibration damping and sealing between the valve seat and the baffle, reducing the impact between the armature and the pole shoe and between the baffle and the valve seat, thereby improving the response speed and service life of the injection valve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the electromagnetic component structure of the present invention; Figure 3 This is a schematic diagram of the armature assembly structure of the present invention; Figure 4 This is a schematic diagram of the baffle structure of the present invention; Figure 5 This is a schematic diagram of the armature structure of the present invention; Figure 6 This is a schematic diagram of the valve core position structure when the through-pipe is closed according to the present invention; Figure 7 This is a schematic diagram of the valve core position structure when the channel of the present invention is opened; Figure 8 This is a schematic diagram of the S-shaped spring structure of the present invention; Figure 9 This is a schematic diagram of the valve seat and pole shoe fixing weld joint structure of the present invention; In the diagram: 1-Plastic encapsulated shell, 101-Connector protective sleeve, 2-Electromagnetic assembly, 201-Coil frame, 202-Connecting protrusion, 203-Coil cover, 204-Armature tube, 205-Coil, 3-Pole shoe, 301-Narrowing, 302-Second anti-detachment groove, 303-First sealing groove, 304-First air intake channel, 305-First conical channel, 306-Coil support platform, 307-Second air intake channel, 308-Second conical channel, 309-Positioning step, 310-Third air intake channel, 311-Fourth air intake channel, 4-Armature assembly, 41-Baffle, 411-Sealing gasket, 412-Air outlet, 413-Connecting cylinder, 414-Exit Air baffle, 415-dovetail groove, 42-armature, 421-pressure ring, 422-connecting cavity, 423-chamfer, 424-weight reduction groove, 425-buffer pad, 426-limiting hole, 427-spring hole, 43-S-shaped spring, 44-support ring, 45-limiting ring, 5-valve seat, 501-first air outlet channel, 502-second air outlet channel, 503-third air outlet channel, 504-sealing ring, 505-air outlet interface, 506-second anti-detachment groove, 507-armature assembly mounting groove, 508-gasket mounting groove, 509-armature movable cavity, 6-filter screen, 7-cylindrical pin, 8-spring, 9-gasket, 10-sealing ring, 11-connection plug. Detailed Implementation

[0019] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0020] like Figure 1 As shown, a long-life, high-precision digitally controlled gas injection valve includes a valve seat 5, an armature assembly, an electromagnetic assembly, and a pole shoe 3. The armature assembly is installed inside the valve seat 5 via a gasket 9 fixed at its opening. The electromagnetic assembly is fixed internally to the outer wall of one end of the pole shoe 3 and externally to the gasket 9. A plastic-sealed shell 1 is provided on the outer walls of the electromagnetic assembly 2, pole shoe 3, and valve seat 5. A channel penetrating the injection valve is formed within the pole shoe 3, armature assembly 4, and valve seat 5. A spring 8 is installed inside the pole shoe 3 to compress the armature assembly 4 and seal the channel within the valve seat 5. A connector 11 is provided on the outer wall of the plastic-sealed shell 1 to connect to the electromagnetic assembly 2. The armature assembly is supported in the first valve body by double S-shaped springs and is compressed by the spring 8 to seal the gas outlet channel of the second valve body. When the gas valve is opened, the battery assembly 2 is energized, and under the influence of magnetic force, the valve core moves rapidly towards the pole shoe. A gasket 9 is placed between the valve core and the valve seat as a magnetic conductor for the coil assembly, causing the armature to be enveloped by the magnetic circuit.

[0021] like Figure 3As shown, the armature assembly 4 includes a baffle 41 and an armature 42. The baffle 41 is connected by a connecting cylinder 413 and an exhaust baffle 414. The armature 42 has a connecting cavity 422 machined in the center. The end of the connecting cylinder 413 is welded into the connecting cavity 422. There are two S-shaped spring pieces 43 installed on the outer wall of the connecting cylinder 413 between the armature 42 and the exhaust baffle 414. There is a limiting ring 45 on the inner side of each of the two S-shaped spring pieces 43, which contacts it. The outer ends of the two limiting rings 45 are connected and fixed by a support ring 44. Several exhaust holes 412 are evenly machined on the side wall of the connecting cylinder 413 between the two S-shaped spring pieces 43. The distance between the two limiting rings 45 is fixed by the support ring 44. Since the limiting ring 45 contacts the inner side of the two S-shaped springs 43, it restricts the two S-shaped springs from getting close to each other. The outer sides of the two S-shaped springs 43 are blocked by the air outlet baffle 414 and the pressure ring 421 respectively, which prevents the S-shaped springs from sliding on the connecting cylinder 413 during the movement of the valve core, thus avoiding wear of the connecting cylinder 413 and the S-shaped springs. Furthermore, several air outlet holes 412 are uniformly machined on the side wall of the connecting cylinder 413 between the two S-shaped spring pieces 43. The gas entering from the valve seat enters the connecting cylinder through the hole in the center of the armature, flows through the air outlet holes 412 on the connecting cylinder to the space between the S-shaped spring pieces, and then flows from the holes on the S-shaped spring pieces to the armature moving chamber 509, so that a certain amount of gas can be stored in the valve body. After the outlet channel is opened, enough gas is ejected to provide sufficient power when the vehicle starts.

[0022] Furthermore, such as Figure 3 and Figure 4 As shown, in order to increase the sealing effect of the gas valve and to prevent the valve core from impacting the first housing when closing the gas outlet passage, a sealing gasket 411 made of engineering plastic is installed on the gas outlet baffle. In order to prevent the sealing gasket 411 from falling off during the impact, a dovetail groove 415 is also machined on the gas outlet baffle 414 to hold the sealing gasket 411.

[0023] Furthermore, such as Figure 5 As shown, in order to prevent the spring from falling off or sliding in the valve body, the armature 42 is also machined with a limiting hole 426 and a spring hole 427. The spring hole is used to install the spring, and the side wall of the limiting hole is used to provide the spring with a force position. The two ends of the limiting hole 426 are connected to the connecting cavity 422 and the spring hole 427 respectively to form a stepped hole with large ends.

[0024] Furthermore, such as Figure 5As shown, the armature 42 has a raised pressure ring 421 in the middle that contacts the S-shaped spring 43. The raised pressure ring 421 keeps the edge of the armature a certain distance from the S-shaped spring, giving the armature enough deformation space. In order to reduce the impact force of the valve core during movement, the edge of the armature 42 is machined with a weight reduction groove 424. The lighter armature has less kinetic energy and also reduces the supporting pressure of the S-shaped spring. The dovetail annular groove on the end face of the armature 42 away from the baffle 41 is provided with a buffer pad 425 made of engineering plastic to avoid the impact between the light armature and the pole shoe 3.

[0025] Furthermore, such as Figure 2 As shown, the valve seat 5 has a first gas outlet channel 501, a second gas outlet channel 502, a third gas outlet channel 503, an armature movable cavity 509, an armature assembly mounting groove 507, and a gasket mounting groove 508 sequentially machined along its center line. When the gas entering from the third gas outlet channel 503 passes through the second gas outlet channel 502, it is throttled by the reduced diameter of the second gas outlet channel 502, thus controlling the flow rate of the gas. The armature movable cavity 509, armature assembly mounting groove 507, and gasket mounting groove 508 form a continuous stepped hole. The edges of the two S-shaped springs 43 in the armature assembly 4 are installed in the armature assembly mounting groove 507, and the edge of the gasket 9 is installed in the gasket mounting groove 508. The gasket presses the S-shaped springs into the armature assembly mounting groove 507 to prevent their edges from sliding and affecting the opening speed of the gas valve. The armature movable cavity 509 is trapezoidal, which provides sufficient movement space for the valve core and also provides a certain storage space inside the valve. The two ends of the outer wall of the valve seat 5 are respectively machined with an outlet port 505 and a second anti-detachment groove 506. The end of the outlet port 505 is machined with a groove, and an outlet sealing ring is installed in the groove for connection with other pipe fittings. There are two adjacent anti-detachment grooves 506. When forming the plastic seal shell 1, the plastic sealant flows into the second anti-detachment groove to fix one end of the plastic seal shell.

[0026] Furthermore, in order to enhance the sealing effect of the valve core, a sealing ring 504 with a protrusion along its centerline is machined at the connection between the armature moving chamber 509 and the third air outlet channel 503. Since a sealing gasket 411 is provided on the air outlet baffle, when the spring squeezes the valve core, the sealing gasket 411 is concave and deformed under the pressure of the sealing ring 504, which can reduce the machining accuracy of the third air outlet channel 503.

[0027] Furthermore, such as Figure 2As shown, the electromagnetic component 2 has a first air intake channel 304, a second air intake channel 307, a third air intake channel 310, and a fourth air intake channel 311 sequentially machined at its center. The diameters of the first air intake channel 304 and the third air intake channel 310 are both larger than those of the second air intake channel 307, and they are respectively connected by a first conical channel 305 and a second conical channel 308 to facilitate the installation of the cylindrical pin 7 and the spring 8 in the second air intake channel 307. One end of the second air intake channel 307 is fixed with the cylindrical pin 7 by welding, and the other end is equipped with the spring 8. The cylindrical pin 7 supports the spring 8 to provide pressure to the valve core. The first air intake channel 304 is adjacent to the armature 42.

[0028] Furthermore, the outer wall of the valve seat 5 is sequentially machined with a constriction 301, a coil support platform 306, a positioning step 309, a second anti-detachment groove 302, and a first sealing groove 303. The constriction 301 facilitates the assembly of the coil and the valve seat. The positioning step 309, after being encapsulated with the coil cover, restricts the relative movement between the valve seat and the coil. The second anti-detachment groove 302, in conjunction with the encapsulated shell, fixes the valve seat inside the encapsulated shell. The first sealing groove 303 is used to connect other pipe fittings and to install a sealing ring. The coil support platform 306 supports the coil and also serves as the pole shoe to form a circulating magnetic circuit. The coil support platform 306 is higher than the constriction 301 and the positioning step 309. A sealing ring is installed in the first sealing groove 303.

[0029] Furthermore, such as Figure 2 As shown, the electromagnetic component 2 includes a coil 205. The inner side and both ends of the coil 205 are supported by an "I"-shaped coil frame 201. The outer side of the coil 205 and one side of the coil frame 201 are wrapped by an "L"-shaped coil cover 203. One end of the coil cover 203 and the other side of the coil frame 201 are in contact with the edge of the gasket 9. The inner ring of the coil frame 201 and the other end of the coil cover 203 are tightly fitted with the outer wall of the pole shoe 3. An "L"-shaped armature tube 204 is provided between the side of the coil frame 201 adjacent to the gasket 9 and the pole shoe 3. Figure 9 As shown, the two ends of the armature tube 204 are welded to the gasket 9 and the pole shoe 3 respectively. The armature tube 204 not only fixes the electromagnetic component to the pole shoe 3, but also welds and fixes the pole shoe and electromagnetic component to the valve body.

[0030] Furthermore, such as Figure 1 As shown, one end of the plastic-encapsulated housing 1 is inserted into the second anti-detachment groove 506, and the other end is inserted into the side wall of the first sealing groove 303. The two ends respectively fix the pole shoe and the valve seat. The middle part of the plastic-encapsulated housing 1 extends into the coil cover 203 through the through hole processed on the coil cover 203 and contacts the coil 205 to fix the coil. The side wall of the plastic-encapsulated housing 1 is also provided with a connector protective sleeve 101, and the wiring plug 11 is located in the circular groove processed at the outer end of the connector protective sleeve 101.

[0031] like Figure 1 , Figure 6 , Figure 7 As shown, a filter screen is installed inside the air inlet of the pole shoe. Gas enters the valve through the filter screen, energizing the coil assembly to control the injection valve and thus the gas flow out. When the injection valve is not energized, the baffle and valve seat, under the action of the spring, overcome the reaction force of the two S-shaped springs and fit together in a sealed manner. Figure 2 When the injection valve coil assembly is energized, under the electromagnetic action of the coil assembly, the armature of the baffle assembly overcomes the spring force and fits against the pole shoe. When the spring force is not considered, in the free state, the armature assembly is at the center position between the pole shoe and the valve seat, meaning the distance between the armature and the pole shoe is equal to the distance between the baffle and the valve seat. This minimizes the deformation stress of the double S-shaped spring sheet at its left and right extreme positions, thus maximizing the lifespan of the S-shaped spring sheet.

[0032] like Figure 8 The diagram shows the structure of an S-shaped spring. The S-shaped spring has an arc-shaped hole machined on its end face, through which the gas in the valve core can flow into the outlet channel of the valve seat.

[0033] like Figure 2 As shown, the electromagnetic assembly forms a circulating magnetic circuit through the pole shoe 3, the coil cover 203, and the armature 42. At the point where the armature 42 and the coil cover 203 form the magnetic circuit, a narrowing 301 is machined on the outer wall of the pole shoe 3 to create a magnetic gap between the coil cover and the pole shoe, which will not weaken the magnetic strength between the armature and the coil cover. Furthermore, the wall thickness of the part of the pole shoe adjacent to the coil is increased, which increases the magnetic passage at that point.

Claims

1. A long-life, high-precision digitally controlled gas injection valve, comprising a valve seat (5), an armature assembly, an electromagnetic assembly, and a pole shoe (3), characterized in that: The armature assembly is installed inside the valve seat (5) by means of a gasket (9) fixed at its opening. The inner side of the electromagnetic assembly is fixed on the outer circular surface of one end of the pole shoe (3), and the side of the electromagnetic assembly is fixed on the gasket (9). The electromagnetic assembly (2), pole shoe (3), and valve seat (5) are provided with a plastic-sealed shell (1). The pole shoe (3), armature assembly (4), and valve seat (5) form a channel that penetrates the injection valve; A spring (8) is installed inside the pole shoe (3) to press the armature assembly (4) to close the channel inside the valve seat (5); The outer wall of the plastic-encapsulated housing (1) is provided with a wiring plug (11) for connection to the electromagnetic component (2); The valve seat (5) is provided with an armature movable cavity (509), and the armature assembly 4 is movably disposed in the armature movable cavity 509; The armature assembly (4) includes a baffle (41) and an armature (42). The baffle (41) is connected by a connecting cylinder (413) and an exhaust baffle (414). The armature (42) has a connecting cavity (422) machined in the center. The end of the connecting cylinder (413) is welded into the connecting cavity (422). There are two S-shaped spring pieces (43) between the armature (42) and the exhaust baffle (414) installed on the outer wall of the connecting cylinder (413). There is a limiting ring (45) on the inner side of each of the two S-shaped spring pieces (43) in contact with it. The outer ends of the two limiting rings (45) are connected and fixed by a support ring (44). Several exhaust holes (412) are uniformly machined on the side wall of the connecting cylinder (413) between the two S-shaped spring pieces (43). The air outlet baffle (414) is also machined with a dovetail groove (415), and a sealing gasket (411) made of engineering plastic is installed in the dovetail groove (415). The armature (42) is provided with a buffer pad (425) made of engineering plastic in the dovetail annular groove on the end face away from the baffle (41).

2. The long-life, high-precision digitally controlled gas injection valve as described in claim 1, characterized in that: The armature (42) is also machined with a limiting hole (426) and a spring hole (427). The two ends of the limiting hole (426) are connected to the connecting cavity (422) and the spring hole (427) respectively to form a stepped hole with large ends. The spring hole (427) is assembled with one end of the spring (8).

3. The long-life, high-precision digitally controlled gas injection valve as described in claim 2, characterized in that: The armature (42) has a raised pressure ring (421) in the middle that contacts the S-shaped spring (43), and the edge of the armature (42) is machined with a weight reduction groove (424).

4. The long-life, high-precision digitally controlled gas injection valve as described in claim 3, characterized in that: When the S-shaped spring (43) does not deform, the gaps between the sealing gasket (411) and the buffer gasket (425) and the valve seat (5) and the pole shoe (3) are equal, respectively.

5. The long-life, high-precision digitally controlled gas injection valve as described in claim 1, characterized in that: The valve seat (5) has a first air outlet channel (501), a second air outlet channel (502), a third air outlet channel (503), an armature movable cavity (509), an armature assembly mounting groove (507), and a gasket mounting groove (508) sequentially machined along its center line. The armature movable cavity (509), the armature assembly mounting groove (507), and the gasket mounting groove (508) form a continuous stepped hole. The edges of the two S-shaped springs (43) in the armature assembly (4) are installed in the armature assembly mounting groove (507), and the edges of the gasket (9) are installed in the gasket mounting groove (508). The armature movable cavity (509) is trapezoidal. The valve seat (5) has two anti-detachment grooves (506) machined on its outer wall. The plastic-sealed shell (1) is embedded into the two anti-detachment grooves (506) by injection molding. An outlet sealing ring (10) is also installed at the end of the outer wall of the valve seat (5).

6. The long-life, high-precision digitally controlled gas injection valve as described in claim 5, characterized in that: The diameters of the first air outlet channel (501) and the third air outlet channel (503) are larger than the diameter of the second air outlet channel (502), and a sealing ring (504) with a protrusion along its centerline is machined at the connection between the armature moving cavity (509) and the third air outlet channel (503).

7. The long-life, high-precision digitally controlled gas injection valve as described in claim 1, characterized in that: The electromagnetic component (2) has a first air intake channel (304), a second air intake channel (307), a third air intake channel (310), and a fourth air intake channel (311) sequentially machined at its center. The diameters of the first air intake channel (304) and the third air intake channel (310) are both larger than those of the second air intake channel (307) and are respectively connected by a first conical channel (305) and a second conical channel (308). A cylindrical pin (7) is welded to one end of the second air intake channel (307) to support the spring (8) installed inside.

8. The long-life, high-precision digitally controlled gas injection valve as described in claim 1, characterized in that: The electromagnetic component (2) includes a coil (205). The inner side and both ends of the coil (205) are supported by an "I"-shaped coil frame (201). The outer side of the coil (205) and one side of the coil frame (201) are wrapped by an "L"-shaped coil cover (203). One end of the coil cover (203) and the other side of the coil frame (201) are in contact with the edge of the pad (9). The inner ring of the coil frame (201) and the other end of the coil cover (203) are tightly fitted with the outer wall of the pole shoe (3). An "L"-shaped armature tube (204) is provided between the side of the coil frame (201) adjacent to the pad (9) and the pole shoe (3). The two ends of the armature tube (204) are welded to the pad (9) and the pole shoe (3) respectively.

9. The long-life, high-precision digitally controlled gas injection valve as described in claim 1, characterized in that: One end of the plastic-encapsulated housing (1) is inserted into the anti-disengagement groove (506) on the outer wall of the valve seat (5), and the other end is inserted into the second anti-disengagement groove (302) on the outer wall of the pole shoe (3). The middle part of the plastic-encapsulated housing (1) contacts the coil (205) through the through hole processed on the coil cover (203). The side wall of the plastic-encapsulated housing (1) is also provided with a connector protective sleeve (101), and the wiring plug (11) is located in the round groove processed at the outer end of the connector protective sleeve (101).

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