An electromagnetic valve type fuel injector

Abstract

The utility model relates to the field of automobile fuel injection system, concretely is a kind of electromagnetic valve type oil atomizer.The design is aimed at the problems, such as sealing leakage, response lag and maintenance difficulty, existing in traditional oil atomizer, multiple sealing is formed using three-section valve core structure, the linear sealing combination of the taper inclined plane of first valve body and second valve body and third valve body is passed through, and main and secondary two-stage sealing is blocked oil circuit when power off.Oil circuit opening and closing adopt step-by-step control mechanism, valve core moves up and opens main oil passage first and then is completely conducted when power on, third valve body resets preferentially and forms main sealing when power off, ensure quick start-stop.Replaceable screen structure is set to oil inlet end, and threaded connection assembly is used to oil outlet end, and each component is detachably connected by annular clamping groove and sealing gasket ring.The oil atomizer improves working reliability while maintaining compact structure by optimizing sealing form and oil circuit control logic, and reduces maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to a solenoid valve type fuel injector. Background Technology

[0002] In a fuel injection system, the injector is a key component, and its performance directly affects the fuel injection accuracy, atomization effect, and overall engine operating efficiency.

[0003] Current fuel injectors typically rely on a single sealing structure of the valve core to control the flow of fuel. However, some solenoid valve injectors have simple valve core structures with poor sealing performance, which can easily lead to fuel leakage, affecting the injector's injection performance and the engine's operational stability.

[0004] Moreover, the oil flow path design of some injectors is not reasonable enough. During the energization and de-energization of the electromagnetic coil, the flow and cut-off of oil are not fast and precise enough, which cannot meet the engine's fast response requirements for fuel injection under different operating conditions.

[0005] In addition, the maintenance and cleaning of existing fuel injectors are relatively difficult. Due to their compact structure, the disassembly and assembly of the various components are inconvenient, making it difficult to effectively clean and unclog the internal channels when maintaining the fuel injector, which increases maintenance costs and time.

[0006] To address the aforementioned problems, this utility model document proposes a solenoid valve type fuel injector. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing fuel injectors, such as poor valve core sealing leading to fuel leakage, slow oil flow response, and difficult and costly maintenance and cleaning. Therefore, this invention proposes a solenoid valve type fuel injector.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A solenoid valve type fuel injector, comprising:

[0010] The main valve sleeve has a first communicating cavity inside it;

[0011] The connector is threaded to the bottom of the main valve sleeve;

[0012] A connecting sleeve, the inner wall of which is threadedly connected to the outer wall of the connector;

[0013] An oil outlet is fixedly connected to the bottom of the connecting sleeve, and a liquid outlet hole is provided at the bottom end. A liquid delivery channel is provided inside the oil outlet.

[0014] The oil inlet is threaded to the top of the main valve sleeve and communicates with the first communicating cavity;

[0015] The valve core is slidably disposed within the first communicating cavity;

[0016] An electromagnetic coil is installed inside the main valve sleeve and electrically connected to an external circuit.

[0017] When the electromagnetic coil is not energized, the valve core seals and blocks the flow path of oil from the first connecting cavity to the infusion channel; when the electromagnetic coil is energized, the valve core moves to allow the oil to be discharged sequentially through the first connecting cavity, the infusion channel and the outlet hole.

[0018] In one possible design, the valve core includes a first valve body, a second valve body, and a third valve body, with the outer diameters of the first, second, and third valve bodies decreasing sequentially; the bottom ends of both the first and second valve bodies are provided with tapered slopes; the second valve body is fixedly connected to the bottom end of the first valve body, and the third valve body is fixedly connected to the bottom end of the second valve body; the outer walls of both the first and second valve bodies are provided with multiple oil passage grooves.

[0019] When the valve core moves, the conical inclined surface seals against or disengages from the corresponding cavity wall, forming a multi-seal structure.

[0020] In one possible design, the connector has a second communicating cavity inside, which is connected to the first communicating cavity; one end of the infusion channel is connected to the second communicating cavity, and the other end is connected to the outlet hole.

[0021] The inner wall of the first communicating cavity is in a sealing sliding fit with the outer wall of the first valve body, and the tapered inclined surface at the bottom of the first valve body is in a sealing abutment fit with the bottom inner wall of the first communicating cavity.

[0022] The inner wall of the second communicating cavity is in a sealing sliding fit with the outer wall of the second valve body, and the tapered slope at the bottom of the second valve body is in a sealing abutment fit with the slope at the top of the infusion channel;

[0023] The inner wall of the infusion channel is in a sealing sliding fit with the outer wall of the third valve body.

[0024] In one possible design, the main valve sleeve has an internal mounting cavity located outside the first communicating cavity; the electromagnetic coils are stacked in a ring within the mounting cavity.

[0025] It also includes a spring, the top end of which abuts against the bottom end of the oil inlet via a spring seat, and the bottom end of which abuts against the top end of the valve core via a spring seat, for providing the sealing preload of the valve core.

[0026] In one possible design, an electrode connector is fixedly mounted on one side of the main valve sleeve. The electrode connector is connected to the mounting cavity to enable the connection between the electromagnetic coil and an external circuit.

[0027] In one possible design, a sealing gasket ring is provided inside the connecting sleeve, and the sealing gasket ring is in a sealing abutment fit with the bottom of the connector.

[0028] In one possible design, the top of the connector has an annular groove, and the bottom of the main valve sleeve has an annular protrusion. The annular groove and the annular protrusion are sealed and engaged.

[0029] In one possible design, an oil filter screen is fixedly installed inside the oil inlet to filter the oil entering the first communicating cavity.

[0030] In one possible design, when the electromagnetic coil is energized, the conical slopes of the first and second valve bodies simultaneously disengage from their corresponding sealing surfaces, and the third valve body is withdrawn from the infusion channel, allowing the oil to flow through the oil passage. When the electromagnetic coil is de-energized, the third valve body preferentially inserts into the infusion channel to form a primary seal, and then the conical slopes of the first and second valve bodies simultaneously settle to form a secondary seal.

[0031] In this application, the injector is assembled and installed sequentially. During operation, external oil enters the first connecting cavity inside the main valve sleeve through the inlet nozzle. When the solenoid coil is not energized, the spring pushes the valve core downward, causing the tapered slope at the bottom of the first valve body to tightly contact the inner wall at the bottom of the first connecting cavity, while the tapered slope at the bottom of the second valve body tightly contacts the slope at the top of the infusion channel, and the third valve body is tightly inserted into the infusion channel. At this time, the multiple sealing structure of the valve core can effectively block the flow path of oil from the first connecting cavity to the infusion channel, ensuring that the injector is in the closed state.

[0032] When an external circuit energizes the electromagnetic coil, the generated magnetic force drives the valve core to move upward against the spring force. The conical inclined surface of the first valve body first detaches from the bottom inner wall of the first connecting cavity, and the oil flows into the space below it through the oil passage groove on the outer wall of the first valve body; simultaneously, the conical inclined surface of the second valve body detaches from the inclined surface at the top of the infusion channel; as the valve core continues to move upward, the third valve body can be drawn out from the infusion channel; the oil will pass through the oil passage groove of the second valve body, the second connecting cavity, and the infusion channel in sequence, and finally be sprayed out from the outlet hole at the bottom of the oil nozzle. The valve core only needs to move slightly upward to achieve the flow of oil, and the oil can be discharged after ensuring that the third valve body is drawn out from one end of the infusion channel. The response is sensitive, facilitating the rapid and accurate discharge of oil.

[0033] When the electromagnetic coil is de-energized, the magnetic force disappears, and the spring pushes the valve core to reset. The third valve body can first be inserted into the infusion channel to complete the main seal. Then, the conical inclined surfaces of the first and second valve bodies simultaneously contact the corresponding inclined inner walls to form a secondary seal, ensuring that the oil channel is completely cut off and the oil injection process is terminated.

[0034] When the oil flows through the filter screen inside the inlet nozzle, impurities are filtered out, reducing the risk of channel blockage. The threaded fit between the connector and the connecting sleeve, the compression seal of the sealing gasket, and the nested structure of the annular groove and annular protrusion work together to maintain the sealing of the connections between the chambers. Furthermore, since all components of this injector can be disassembled and separated, maintenance of the injector only requires separating each component, after which each component and channel can be cleaned and unblocked accordingly, making the operation simple and convenient.

[0035] Beneficial effects: In this utility model, the solenoid valve injector has a three-section valve core design, which, together with the corresponding sealing surface, forms a multi-seal structure. In the closed state, the three valve bodies form an effective seal with the corresponding cavity wall or channel, which greatly reduces the possibility of fuel leakage from the high-pressure chamber to the low-pressure chamber and ensures the reliable closure of the injector.

[0036] In this invention, the solenoid valve injector, when the solenoid coil is energized and drives the valve core to move upward, the first valve body and the second valve body simultaneously disengage from the sealing surface to open the initial oil circuit until the third valve body is withdrawn from the fluid delivery channel, at which point the oil circuit is fully opened. After power is cut off, the third valve body preferentially inserts into the fluid delivery channel to form the main seal, and then the conical surfaces of the first and second valve bodies simultaneously sit down to form the secondary seal. The switching action is rapid and orderly. This step-by-step opening and closing mechanism makes the injector highly responsive to control signals, which is beneficial for achieving rapid start-stop and accurate metering of fuel injection.

[0037] In this utility model, the solenoid valve type injector has an oil filter screen at the oil inlet that can effectively filter impurities in the oil, reduce the risk of impurities entering the main oil circuit and precision mating surfaces, and reduce the failure rate caused by blockage.

[0038] In this utility model, the solenoid valve type injector adopts a modular design. The main valve sleeve, connector, connecting sleeve, and nozzle are connected by threads, sealing grooves, etc., and a sealing gasket ring is provided to ensure the sealing of the connection. This structure allows the injector to be easily disassembled into the main components, which facilitates thorough cleaning and unblocking of the internal channels of each component, and significantly simplifies the maintenance process.

[0039] In this utility model, the solenoid valve injector has a multi-seal structure that not only improves static sealing performance but also enhances sealing reliability during dynamic operation; the spring continuously provides sealing preload to the valve core, ensuring reliable closure when power is off; the detachable structure and oil filter design together reduce potential failures and extend the service life of the injector; the electrode connector facilitates reliable connection to external circuits.

[0040] In this invention, the injector uses a three-section valve core to form multiple seals, which can improve the sealing performance and prevent oil leakage; the valve core operates in stages (opening and disengaging simultaneously, closing and resetting the main seal first) to ensure rapid opening and closing of the oil circuit and facilitate accurate oil discharge; the oil filter screen can reduce internal blockage of the injector; the modular combination design of its components facilitates disassembly and cleaning, and is easy to maintain, effectively ensuring the reliability and service life of the equipment. Attached Figure Description

[0041] Figure 1 This is a three-dimensional structural diagram of an electromagnetic valve type fuel injector proposed in this utility model.

[0042] Figure 2 This is a cross-sectional structural diagram of an electromagnetic valve type fuel injector proposed in this utility model;

[0043] Figure 3 This is a schematic diagram showing the disassembled structure of an electromagnetic valve type fuel injector proposed in this utility model;

[0044] Figure 4 This is a schematic diagram of the valve core structure of an electromagnetic valve injector proposed in this utility model;

[0045] Figure 5 This is a schematic diagram of the connector structure of a solenoid valve type fuel injector proposed in this utility model;

[0046] Figure 6 This is a schematic diagram of the inlet structure of an electromagnetic valve type fuel injector proposed in this utility model;

[0047] Figure 7 This is a schematic diagram of the internal structure of the main valve sleeve of a solenoid valve injector proposed in this utility model.

[0048] In the diagram: 1. Main valve sleeve; 2. Oil inlet nozzle; 3. Connector; 4. Connecting sleeve; 5. Oil outlet nozzle; 6. Electrode connector; 7. First connecting cavity; 8. Mounting cavity; 9. Electromagnetic coil; 10. Valve core; 11. Spring; 12. Second connecting cavity; 13. Infusion channel; 14. Infusion hole; 15. Sealing gasket ring; 16. Oil filter screen; 17. First valve body; 18. Second valve body; 19. Third valve body; 20. Oil passage groove; 21. Annular groove; 22. Annular protrusion. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0050] In one embodiment: Refer to Figure 1-7 An injector includes components such as a main valve sleeve 1, a connector 3, a connecting sleeve 4, an outlet nozzle 5, an inlet nozzle 2, a valve core 10, and an electromagnetic coil 9.

[0051] In this embodiment, the main valve sleeve 1 is the main structure of the entire injector, and a first communicating cavity 7 is provided inside it. The connector 3 is fixed to the bottom of the main valve sleeve 1 by a threaded connection. The connector 3 has a second communicating cavity 12 inside, which communicates with the first communicating cavity 7. The connecting sleeve 4 is sleeved on the outside of the connector 3, and the outer wall of the connector 3 and the inner wall of the connecting sleeve 4 are connected by threads to achieve a stable connection between the two.

[0052] The oil outlet 5 is fixedly connected to the bottom of the connecting sleeve 4. The inside of the oil outlet 5 is provided with a liquid delivery channel 13. One end of the liquid delivery channel 13 is connected to the second connecting cavity 12, and the other end is connected to the liquid outlet hole 14 opened at the bottom of the oil outlet 5, so that the oil in the main valve sleeve 1 can pass through the second connecting cavity 12 and the liquid delivery channel 13 in sequence, and finally be discharged from the liquid outlet hole 14.

[0053] In this embodiment, the oil inlet nozzle 2 is connected to the top end of the main valve sleeve 1 by a thread, and the oil inlet nozzle 2 is connected to the first communicating cavity 7 to input external oil into the first communicating cavity 7 inside the main valve sleeve 1.

[0054] In this embodiment, the valve core 10 is slidably disposed within the first communicating cavity 7, and its main function is to control the discharge of oil from the main valve sleeve 1. The valve core 10 consists of a first valve body 17, a second valve body 18, and a third valve body 19, with the outer diameters of these three valve bodies decreasing sequentially. The bottom ends of the first valve body 17 and the second valve body 18 are both provided with tapered inclined surfaces. The second valve body 18 is fixedly connected to the bottom end of the first valve body 17, and the third valve body 19 is fixedly connected to the bottom end of the second valve body 18.

[0055] Furthermore, in this embodiment, the outer walls of both the first valve body 17 and the second valve body 18 are provided with multiple oil passage grooves 20, which provide channels for the passage of oil. The inner wall of the first connecting cavity 7 is in a sealed sliding fit with the outer wall of the first valve body 17, and the tapered slope at the bottom of the first valve body 17 is in sealed contact with the bottom inner wall of the first connecting cavity 7; the inner wall of the second connecting cavity 12 is in a sealed sliding fit with the outer wall of the second valve body 18, and the tapered slope at the bottom of the second valve body 18 is in sealed contact with the slope at the top of the infusion channel 13; the inner wall of the infusion channel 13 is in a sealed sliding fit with the outer wall of the third valve body 19. Through this multi-stage sealing and sliding fit structure, the flow and cut-off of oil can be precisely controlled.

[0056] In this embodiment, the electromagnetic coil 9 is disposed inside the main valve sleeve 1. Specifically, the main valve sleeve 1 has an installation cavity 8 inside, which is located outside the first communicating cavity 7. The electromagnetic coil 9 is disposed in the installation cavity 8 in a ring-like stacked manner, thereby achieving a surrounding sleeve outside the first communicating cavity 7. The electromagnetic coil 9 is electrically connected to an external circuit and generates a magnetic field force through the conversion between electricity and magnetism, thereby driving the valve core 10 to move within the main valve sleeve 1.

[0057] In this embodiment, to ensure that the valve core 10 can maintain a sealed state when it is not powered on, a spring 11 is provided at the top of the valve core 10 through a spring 11 seat. The top of the spring 11 abuts against the bottom of the oil inlet 2 through the spring 11 seat. The elastic force of the spring 11 causes the valve core 10 to continuously abut downward, thereby achieving a sealing effect.

[0058] This application can be used in the field of automotive parts technology, or in other fields applicable to this application.

[0059] In another embodiment: Reference Figure 2 , 3 6. A solenoid valve type fuel injector, which is applied to the field of automotive parts technology;

[0060] In this embodiment, to facilitate the connection between the electromagnetic coil 9 and the external circuit, an electrode connector 6 is fixedly installed on one side of the main valve sleeve 1. The electrode connector 6 is connected to the mounting cavity 8, and the external circuit can be electrically connected to the electromagnetic coil 9 through the electrode connector 6.

[0061] In this embodiment, to ensure a tight connection between the connector 3 and the oil outlet 5, a sealing gasket 15 is provided inside the connecting sleeve 4. The sealing gasket 15 is sealed and abuts against the bottom of the connector 3 to prevent oil leakage from the connection. Simultaneously, an annular groove 21 is provided at the top of the connector 3, and an annular protrusion 22 is provided at the bottom of the main valve sleeve 1. The annular groove 21 and the annular protrusion 22 are sealed and engaged, further ensuring a sealed connection between the first communicating cavity 7 and the second communicating cavity 12, preventing oil leakage.

[0062] In this embodiment, in order to ensure the cleanliness of the input oil, an oil filter screen 16 is fixedly installed inside the oil inlet 2. The oil filter screen 16 can filter the oil that is about to enter the main valve sleeve 1, effectively reducing the probability of blockage in the channel inside the main valve sleeve 1 during long-term use.

[0063] However, as is well known to those skilled in the art, the working principle and wiring method of the electromagnetic coil 9 are commonplace and are all conventional methods or common knowledge. They will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0064] The working principle and usage process of this technical solution are as follows: During use, the injector is assembled and installed sequentially. During operation, external oil enters the first connecting cavity 7 inside the main valve sleeve 1 through the inlet nozzle 2. When the electromagnetic coil 9 is not energized, the spring 11 pushes the valve core 10 downwards, causing the conical slope at the bottom of the first valve body 17 to tightly contact the inner wall of the bottom of the first connecting cavity 7. Simultaneously, the conical slope at the bottom of the second valve body 18 tightly contacts the slope at the top of the infusion channel 13, and the third valve body 19 is tightly inserted into the infusion channel 13. At this time, the multiple sealing structure of the valve core 10 effectively blocks the flow path of oil from the first connecting cavity 7 to the infusion channel 13, ensuring that the injector is in the closed state.

[0065] When the external circuit energizes the electromagnetic coil 9, the generated magnetic force drives the valve core 10 to move upward against the force of the spring 11. The conical slope of the first valve body 17 first disengages from the bottom inner wall of the first connecting cavity 7, and the oil flows into the space below it through the oil passage groove 20 on the outer wall of the first valve body 17; at the same time, the conical slope of the second valve body 18 disengages from the slope at the top of the infusion channel 13; as the valve core 10 continues to move upward, the third valve body 19 can be drawn out from the infusion channel 13; the oil will pass through the oil passage groove 20 of the second valve body 18, the second connecting cavity 12 and the infusion channel 13 in sequence, and finally be sprayed out from the outlet hole 14 at the bottom of the oil outlet 5. The valve core 10 only needs to move slightly upward to realize the flow of oil, and the oil can be discharged after ensuring that the third valve body 19 is drawn out from one end of the infusion channel 13. The response is sensitive and facilitates the rapid and accurate discharge of oil.

[0066] When the electromagnetic coil 9 is de-energized, the magnetic force disappears, and the spring 11 pushes the valve core 10 to reset. The third valve body 19 can first be inserted into the infusion channel 13 to complete the main seal. Then, the conical inclined surfaces of the first valve body 17 and the second valve body 18 synchronously contact the inner walls of the corresponding inclined surfaces to form a secondary seal, which can ensure that the oil channel is completely cut off and the oil injection process is terminated.

[0067] When the oil flows through the filter screen 16 inside the inlet nozzle 2, impurities are filtered out, reducing the risk of channel blockage. The threaded fit between the connector 3 and the connecting sleeve 4, the compression seal of the sealing gasket 15, and the nested structure of the annular groove 21 and the annular protrusion 22 together maintain the sealing of the communication points between the chambers. Furthermore, since all components of the injector can be disassembled, maintenance of the injector only requires separating the components, after which each component and channel can be cleaned and unblocked, making the operation simple and convenient.

[0068] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0069] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An electromagnetic valve type fuel injector characterized by comprising: include: The main valve sleeve (1) has a first communicating cavity (7) inside it; The connector (3) is threaded to the bottom of the main valve sleeve (1); The inner wall of the connecting sleeve (4) is threadedly connected to the outer wall of the connecting head (3); The oil outlet (5) is fixedly connected to the bottom of the connecting sleeve (4), and the bottom end is provided with a liquid outlet hole (14). The inside of the oil outlet (5) is provided with a liquid delivery channel (13). The oil inlet (2) is threaded to the top end of the main valve sleeve (1) and communicates with the first communicating cavity (7); The valve core (10) is slidably disposed within the first communicating cavity (7); An electromagnetic coil (9) is installed inside the main valve sleeve (1) and electrically connected to an external circuit. When the electromagnetic coil (9) is not energized, the valve core (10) seals and blocks the flow path of oil from the first connecting cavity (7) to the infusion channel (13); when the electromagnetic coil (9) is energized, the valve core (10) moves to allow the oil to be discharged sequentially through the first connecting cavity (7), the infusion channel (13) and the outlet hole (14).

2. The solenoid injector according to claim 1, characterized in that The valve core (10) includes a first valve body (17), a second valve body (18), and a third valve body (19), the outer diameters of the first valve body (17), the second valve body (18), and the third valve body (19) decreasing sequentially; the bottom ends of the first valve body (17) and the second valve body (18) are both provided with tapered inclined surfaces; the second valve body (18) is fixedly connected to the bottom end of the first valve body (17), and the third valve body (19) is fixedly connected to the bottom end of the second valve body (18); the outer walls of the first valve body (17) and the second valve body (18) are each provided with multiple oil passage grooves (20); When the valve core (10) moves, the conical inclined surface seals against or separates from the corresponding cavity wall, forming a multi-seal structure.

3. The solenoid injector of claim 2, wherein The connector (3) has a second communicating cavity (12) inside, which is connected to the first communicating cavity (7); one end of the infusion channel (13) is connected to the second communicating cavity (12), and the other end is connected to the outlet hole (14); The inner wall of the first communicating cavity (7) is in a sealing sliding fit with the outer wall of the first valve body (17), and the tapered inclined surface at the bottom end of the first valve body (17) is in a sealing abutment fit with the bottom inner wall of the first communicating cavity (7). The inner wall of the second connecting cavity (12) is sealed and slidingly fitted with the outer wall of the second valve body (18), and the tapered slope at the bottom of the second valve body (18) is sealed and abutted with the slope at the top of the infusion channel (13); The inner wall of the infusion channel (13) is in a sealing sliding fit with the outer wall of the third valve body (19).

4. The electromagnetic valve type fuel injector according to claim 1, wherein The main valve sleeve (1) has an installation cavity (8) inside, and the installation cavity (8) is located outside the first communicating cavity (7); the electromagnetic coil (9) is stacked in a ring inside the installation cavity (8); It also includes a spring (11), the top end of which abuts against the bottom end of the oil inlet (2) through a spring seat, and the bottom end abuts against the top end of the valve core (10) through a spring seat, for providing the sealing preload of the valve core (10).

5. The solenoid injector of claim 4, wherein An electrode connector (6) is fixedly installed on one side of the main valve sleeve (1). The electrode connector (6) is connected to the mounting cavity (8) to realize the connection between the electromagnetic coil (9) and the external circuit.

6. The solenoid injector of claim 1, wherein The connecting sleeve (4) is provided with a sealing gasket (15) inside, and the sealing gasket (15) is sealed and abutted against the bottom of the connector (3).

7. The solenoid injector of claim 1, wherein The connector (3) has an annular groove (21) at the top and the main valve sleeve (1) has an annular protrusion (22) at the bottom. The annular groove (21) and the annular protrusion (22) are sealed and engaged.

8. The solenoid injector of claim 1, wherein The oil inlet (2) is fixedly equipped with an oil filter screen (16) for filtering the oil entering the first connecting cavity (7).

9. The solenoid injector of claim 3, wherein When the electromagnetic coil (9) is energized, the conical slopes of the first valve body (17) and the second valve body (18) simultaneously disengage from their corresponding sealing surfaces, and the third valve body (19) is pulled out from the infusion channel (13), allowing the oil to flow through the oil passage (20); when the electromagnetic coil (9) is de-energized, the third valve body (19) preferentially inserts into the infusion channel (13) to form a primary seal, and then the conical slopes of the first valve body (17) and the second valve body (18) simultaneously sit down to form a secondary seal.

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