Slender rod-shaped electromagnet

Abstract

The present invention provides a slender rod-shaped electromagnet, comprising a magnetic isolation ring (1), an outer iron core (2), a coil (3), a coil frame (4), an inner iron core (5), and a terminal (10); the inner iron core (5) adopts an integral cylindrical stepped shaft shape and has a stepped countersunk hole structure inside, and its stepped outer cylindrical surface is fitted with the inner cylindrical surface of the outer iron core (2); the coil (3) is installed on the outer cylindrical surface of the lower small end of the inner iron core (5) and is fixedly connected to the end of the terminal (10); the magnetic isolation ring (1) is installed at the lower part of the stepped countersunk hole of the inner iron core (5); the inner iron core (5) and the terminal (10) are fixedly connected by a plastic sealing column (6). The present invention adopts a slender rod-shaped structure, and the space required for installation is small, which solves the problem that the electromagnet of the prior art cannot be installed in a narrow space, is far away from the position of the injector nozzle, resulting in a slow injection response speed, which is not conducive to accurate fuel injection.

Description

Technical Field

[0001] The invention relates to a slender rod-shaped electromagnet, in particular to a slender rod-shaped electromagnet in the technical field of engines. Background Art

[0002] With the rapid development of social economy and the increasingly stringent national emission standards, the role of high-pressure common rail technology in engines is becoming more and more important. In diesel engines, the high-pressure fuel (pressure exceeding 1000 bar) pumped out by the high-pressure fuel pump is transported to the high-pressure fuel rail through the high-pressure fuel pipe, and then the constant-pressure fuel stored in the high-pressure fuel rail is transported to the electronically controlled fuel injector through the high-pressure fuel pipe. The ECU controller sends a current signal to the electromagnet on the electronically controlled fuel injector, and the electromagnet attracts the armature to cause the high-pressure fuel oil circuit to be connected, and the injector starts to spray fuel.

[0003] Chinese Patent: Electromagnet for Fast Response Electronically Controlled Fuel Injection (Application No.: 201120569080.4, Authorization Announcement No.: CN202529532U) discloses an electromagnet for electronically controlled fuel injection, including an iron core, a coil, a coil frame, an armature, a magnetic isolation ring, an outer shell, an inner shell, a valve stem, a valve seat, an armature accessory, a valve stem spring and an intermediate shell, characterized in that the magnetic isolation ring is arranged between the step end face below the iron core and the opening section of the inner shell, so that the total magnetic flux is divided into two paths after the coil is energized, so as to solve the "sticking" phenomenon when the armature is released and increase the release speed. However, this electromagnet is the same as most existing electronically controlled fuel injector electromagnets, such as Figure 4 , Figure 5 As shown, the disc-shaped electromagnet 21 installed on the top of the injector is limited by the disc-shaped structure and the space required for installing the socket 22 connected to the outside, and cannot be installed in a small space. At the same time, the disc-shaped electromagnet 21 is far away from the injector nozzle 19 and needs to be driven by a longer piston rod 20 and a matching mechanism. After the solenoid valve is actuated, the mechanical and hydraulic delay is serious, and the injector injection response speed is slow, which is not conducive to accurate fuel injection and affects the fuel consumption and emissions of the engine. Summary of the invention

[0004] In order to solve the problems in the prior art that the electromagnet is too large to be installed in a narrow space, is far away from the fuel injector nozzle, has a serious mechanical and hydraulic delay after the solenoid valve is actuated, and has a slow fuel injection response speed of the fuel injector, which is not conducive to accurate fuel injection and increases the fuel consumption and emissions of the engine, the present invention provides a slender rod-shaped electromagnet.

[0005] The slender rod-shaped electromagnet comprises a magnetic isolation ring, an outer iron core, a coil, a coil frame, and an inner iron core, and is characterized in that it also comprises two terminals; the inner iron core adopts an integral cylindrical stepped shaft shape and has a stepped countersunk hole structure inside, the outer iron core is firmly mounted on the stepped cylindrical surface of the inner iron core, and the stepped outer cylindrical surface of the inner iron core is in contact with the inner cylindrical surface of the outer iron core; the coil is mounted on the outer cylindrical surface of the lower small end of the inner iron core, is wound on the coil frame in a double-wire parallel winding manner, and is fixedly connected to the ends of the two terminals; the magnetic isolation ring is mounted on the lower orifice section of the stepped countersunk hole of the inner iron core; the inner iron core and the terminals are fixedly connected together by a plastic sealing column.

[0006] The slender rod-shaped fuel injector electromagnet of the present invention adopts an integral slender cylindrical structure, and has a compact structure through stepped shape overlap between components, and can be installed in the cylindrical cavity of the fuel injector body. At the same time, through the terminal inside the electromagnet, the electromagnetic control signal line can still reach the upper part of the fuel injector body when the electromagnet is as close to the fuel injector as possible, and is connected to the external control model, so that it can be installed close to the fuel injector.

[0007] Furthermore, the slender rod-shaped electromagnet also includes a flat washer and a disc spring washer; the flat washer and the disc spring washer are installed on the upper thin shaft section of the plastic sealing column.

[0008] Furthermore, the top of the coil and the end surface of the electromagnet are shallow-deep installation structures.

[0009] During implementation, the coil frame at the top of the coil is made very thin, and the end of the coil is very close to the end face of the electromagnet, so that a shallow deep installation structure can be formed.

[0010] Furthermore, the slender rod-shaped electromagnet also includes a wiring lug, and the upper part of the terminal is encapsulated with a non-conductive material to separate the two terminal posts; the wiring lug is fixedly connected to the top of the terminal post for connecting to an external wiring harness plug.

[0011] Furthermore, the non-conductive material is plastic, and the wiring ear piece is rectangular.

[0012] Furthermore, the slender rod-shaped electromagnet also includes a sealing plug, and the sealing plug includes a main sealing ring band and auxiliary sealing lips on both sides.

[0013] The slender rod-shaped electromagnet provided by the present invention adopts a simple and compact slender rod-shaped structure, is suitable for installation in a narrow space, can be installed in the inner cavity of the injector body, and can be installed close to the injector nozzle, shortening the size and weight of the piston rod moving parts, greatly improving the response speed of the injector injection, achieving accurate injection, and reducing the fuel consumption and pollutant emissions of the engine; adopting a shallow deep installation structure in which the coil end is very close to the electromagnet end face can increase the electromagnetic force, further improve the response speed, and at the same time facilitate the rapid heat dissipation of the coil, thereby increasing the service life of the electromagnet; a rectangular wiring ear piece is fixedly connected to the top of the terminal post, which can form a socket in combination with the injector cavity hole for connection with an external wiring harness plug, reducing the space required for the external socket of the electromagnet in the prior art and the corresponding installation, and reducing the manufacturing cost; the sealing plug adopts an auxiliary sealing lip structure arranged on both sides of the main sealing ring belt, and the sealing is reliable.

[0014] In summary, compared with the prior art, the present invention has at least the following beneficial effects: adaptability to installation in a narrow space, proximity to the injector nozzle, less mechanical hydraulic delay after electric actuation, fast injector injection response speed, facilitation of accurate fuel injection, and reduction of engine fuel consumption and emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 is a schematic diagram of the slender rod-shaped electromagnet of the present invention;

[0017] Figure 2 yes Figure 1 Schematic diagram of the medium AA planed surface;

[0018] Figure 3 is a schematic diagram of the slender rod-shaped electromagnet of the present invention installed inside the fuel injector;

[0019] Figure 4 It is a schematic diagram of the installation of a disc-shaped electromagnet of a fuel injector in the prior art;

[0020] Figure 5 yes Figure 4 Schematic diagram of the planing surface;

[0021] In the figure: 1. magnetic isolation ring, 2. outer iron core, 3. coil, 4. coil frame, 5. inner iron core, 6. plastic sealing column, 7. flat gasket, 8. disc spring washer, 9. sealing plug, 10. terminal, 11. terminal ear, 12. control valve seat, 13. armature, 14. spring, 15. adjusting gasket, 16. injector body, 17. terminal lead-out cavity, 18. oil inlet hole, 19. injector nozzle, 20. piston rod, 21. disc-shaped electromagnet, 22. socket. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Embodiment 1:

[0024] like Figure 1 , Figure 2 , Figure 3 As shown, the slender rod-shaped electromagnet described in this embodiment includes a magnetic isolation ring 1, an outer iron core 2, a coil 3, a coil skeleton 4, and an inner iron core 5, and is characterized in that: it also includes two terminal posts 10; the inner iron core 5 adopts an integral cylindrical stepped shaft shape and has a stepped countersunk hole structure inside, the outer iron core 2 is firmly mounted on the stepped cylindrical surface of the inner iron core 5, and the stepped outer cylindrical surface of the inner iron core 5 is in contact with the inner cylindrical surface of the outer iron core 2; the coil 3 is mounted on the outer cylindrical surface of the lower small end of the inner iron core 5, is wound on the coil skeleton 4 in a double-wire parallel winding manner, and is fixedly connected to the ends of the two terminal posts 10; the magnetic isolation ring 1 is mounted on the lower orifice section of the stepped countersunk hole of the inner iron core 5; the inner iron core 5 and the terminal posts 10 are fixedly connected together by a plastic sealing column 6.

[0025] The slender rod-shaped electromagnet of the present invention adopts an integral cylindrical structure and has a compact structure through a stepped design, and can be installed in the cylindrical cavity of the injector body 16. At the same time, through the terminal 10 inside the electromagnet, the electromagnetic control signal line can still reach the upper part of the injector body 16 when the electromagnet is as close to the injector as possible, and is connected to the external control model, so that it can be installed close to the injector.

[0026] When in use: the slender rod-shaped electromagnet provided in this embodiment is installed in the cylindrical cavity of the injector body 16, so that the terminal 10 passes through the terminal lead-out cavity 17 to reach the upper part of the injector body 16, and the terminal lug 11 is connected to the external wiring harness plug to form a closed loop of the circuit; the adjustment gasket 15 and the spring 14 are installed in the countersunk hole of the inner iron core 5 in sequence, the end face of the control valve seat 12 is fitted with the end face of the outer iron core 2, and the lower cylinder of the armature 13 and the mounting hole of the control valve seat 12 are installed in a pairing manner. The pre-compression force generated by the initial compression amount of the spring 14 during installation presses the sealing cone surface of the armature 13 and the sealing cone surface of the control valve seat 12 together. When the external controller energizes the electromagnet coil 3 through the terminal lug 11, the outer iron core 2 and the inner iron core 2 of the electromagnet The core 5 and the armature 13 generate electromagnetic attraction. When the electromagnetic attraction is greater than the pre-compression force of the spring 14, the armature 13 moves upward, the sealing cone surface of the armature 13 and the sealing cone surface of the control valve seat 12 will be disengaged, and the fuel in the lower part of the mounting hole of the control valve seat 12 will flow out through the sealing cone surface, causing the fuel pressure there to drop, and eventually causing the high-pressure fuel maintained in the oil inlet hole 18 to flow through the injector nozzle to start spraying; when the external controller disconnects the power to the electromagnet coil 3, the armature 13 moves downward under the action of the spring 14 force, and the sealing cone surface of the armature 13 fits together with the sealing cone surface of the control valve seat 12, and the fuel in the lower part of the mounting hole of the control valve seat 12 no longer flows out through the sealing cone surface, causing the fuel pressure there to rise, and eventually causing the injector nozzle to stop spraying.

[0027] In this embodiment, a slender rod-shaped structure is simple and compact, suitable for installation in a narrow space, can be installed in the inner cavity of the injector body 16, and can be installed close to the injector nozzle, shortening the size and weight of the piston rod moving parts, greatly improving the response speed of the injector injection, achieving precise injection, and reducing the fuel consumption and pollutant emissions of the engine.

[0028] Embodiment 2:

[0029] Based on the above embodiment, embodiment 2 is proposed, such as Figure 1 As shown, it is characterized in that: the slender rod-shaped electromagnet also includes a flat gasket 7 and a disc spring gasket 8; the flat gasket 7 and the disc spring gasket 8 are installed on the upper thin shaft section of the plastic sealing column 6.

[0030] Embodiment 3:

[0031] Based on the above embodiments, embodiment 3 is proposed. Figure 2 As shown, it is characterized in that the top of the coil 3 and the end surface of the electromagnet are shallow-deep installation structures.

[0032] During implementation, the coil frame 4 at the top of the coil 3 is made very thin, and the end of the coil 3 is very close to the end face of the electromagnet, so that a shallow deep installation structure can be formed.

[0033] In this embodiment, a shallow deep installation structure is adopted in which the end of the coil 3 is very close to the end face of the electromagnet, which can increase the electromagnetic force and further improve the response speed. At the same time, it is conducive to the rapid heat dissipation of the coil 3 and improve the service life of the electromagnet.

[0034] Embodiment 4:

[0035] Based on the above embodiments, embodiment 4 is proposed. Figure 2 As shown, it is characterized in that: the slender rod-shaped electromagnet also includes a wiring ear piece 11, and the upper part of the terminal 10 is encapsulated with a non-conductive material to separate the two terminal posts 10; the wiring ear piece 11 is fixedly connected to the top of the terminal post 10 for connecting to an external wiring harness plug.

[0036] In this embodiment: a wiring ear piece 11 is fixedly connected to the top of the terminal 10, which can form a socket in combination with the injector cavity hole for connecting to an external wiring harness plug, reducing the space required for the external socket of the electromagnet in the prior art and the corresponding installation, thereby reducing the manufacturing cost.

[0037] Embodiment 5:

[0038] Based on the above embodiments, embodiment 5 is proposed, which is characterized in that: the non-conductive material is plastic, and the wiring ear piece 11 is rectangular.

[0039] In this embodiment, the plastic isolation and the rectangular ear piece can further reduce the cost and reduce the installation space.

[0040] Embodiment 6:

[0041] Based on the above embodiments, embodiment 6 is proposed. Figure 1 As shown, it is characterized in that: the slender rod-shaped electromagnet also includes a sealing plug 9, and the sealing plug 9 includes a main sealing ring band and auxiliary sealing lips on both sides.

[0042] In this embodiment, the sealing plug 9 adopts an auxiliary sealing lip structure provided on both sides of the main sealing ring, so that the sealing is reliable.

Claims

1. A slender rod-shaped electromagnet, comprising a magnetic isolation ring (1), an outer iron core (2), a coil (3), a coil frame (4), and an inner iron core (5), characterized in that: It also includes two terminal posts (10); the inner core (5) is in the shape of an integral cylindrical stepped shaft with a stepped countersunk hole structure inside; the outer core (2) is fixedly mounted on the stepped cylindrical surface of the inner core (5); the stepped outer cylindrical surface of the inner core (5) is in contact with the inner cylindrical surface of the outer core (2); the coil (3) is mounted on the outer cylindrical surface of the lower small end of the inner core (5), is wound on the coil frame (4) in a double-wire parallel winding manner, and is fixedly connected to the ends of the two terminal posts (10); the magnetic isolation ring (1) is mounted on the lower hole section of the stepped countersunk hole of the inner core (5); The inner iron core (5) and the terminal (10) are fixedly connected together through a plastic sealing column (6); the flat gasket (7) and the disc spring gasket (8) are also included; the flat gasket (7) and the disc spring gasket (8) are installed on the upper thin shaft section of the plastic sealing column (6); the top of the coil (3) and the end surface of the electromagnet are shallow-deep installation structures; the wiring lug (11) is also included, and the upper part of the terminal (10) is encapsulated with non-conductive material to separate the two terminal (10); the wiring lug (11) is fixedly connected to the top of the terminal (10) and is used to connect to an external wiring harness plug.

2. The elongated rod-shaped electromagnet according to claim 1, characterized in that: It also includes a wiring lug (11), the upper part of the terminal (10) is encapsulated with a non-conductive material to separate the two terminal posts (10); the wiring lug (11) is fixedly connected to the top of the terminal post (10) and is connected to an external wiring harness plug.

3. The elongated rod-shaped electromagnet according to any one of claims 1 and 2, characterized in that: The non-conductive material is plastic, and the wiring ear piece (11) is rectangular.

4. The elongated rod-shaped electromagnet according to any one of claims 1 and 2, characterized in that: It also comprises a sealing plug (9), wherein the sealing plug (9) comprises a main sealing ring band and auxiliary sealing lips on both sides.

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