Magnetic circuit system with low coil power consumption and high-voltage direct current contactor

Abstract

The invention relates to the technical field of contactors, in particular to a magnetic circuit system with low coil power consumption and a high-voltage direct-current contactor, the magnetic circuit system comprises a static assembly part and a movable assembly part, and the magnetic circuit design is optimized by additionally arranging structures such as a coil, a U-shaped yoke, a magnetic conductive cylinder, magnetic steel and a static iron core. Specifically, the special polarity design and position layout of the magnetic steel are combined with the cooperation of the static iron core and the magnetic conductive cylinder, so that the electromagnetic attraction force is greatly improved, the contactor can complete the attraction and release of the contacts in a short time, the working reliability is remarkably improved, the magnetic field energy is effectively concentrated, and the energy input required by the coil is reduced. And the coil driving power consumption is reduced while the strong electromagnetic attraction is realized.

Description

Technical Field

[0001] The present application relates to the technical field of contactors, and in particular to a magnetic circuit system with low coil power consumption and a high-voltage DC contactor. Background Art

[0002] A contactor is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit. A high-voltage DC contactor is a contactor that has the ability to handle high power. It still has the characteristics of reliability and long service life that conventional contactors cannot match under harsh conditions such as high voltage and high current. It is widely used in various fields, such as the field of new energy vehicles. High-voltage DC contactors have attracted much attention because of their ability to handle high power and maintain reliability and long life under high voltage and high current environments. In recent years, with the rapid development of the new energy vehicle industry and technological progress, the demand for high-voltage DC contactors has continued to grow, and has gradually become one of the core components to ensure the stable operation of vehicle electrical systems.

[0003] The interior of the contactor is composed of a coil and a metal contact. The coil realizes the conversion of electrical energy into magnetic energy, attracts the metal contact, and achieves the purpose of closing the contact. When the input quantity in the circuit meets the preset conduction condition, the metal contact in the contactor is attracted, and the internal circuit of the contactor is closed, and the circuit to which it is applied is in the attracted conduction state; when the input quantity in the circuit meets the preset shutdown condition, the metal contact in the contactor is separated, the internal circuit of the contactor is broken, and the circuit to which it is applied is in the released breaking state.

[0004] However, the main problem in the existing technology is that it is difficult to strike a balance between strong electromagnetic attraction and low power consumption. On the one hand, in order to ensure sufficient short-circuit resistance, a larger coil volume and higher driving power consumption are often required; on the other hand, in pursuit of equipment lightweighting and energy saving and consumption reduction goals, it is hoped to reduce the coil size and energy loss as much as possible. This contradiction makes it a technical problem that needs to be solved urgently to achieve rapid attraction and conduction or release and disconnection in a limited coil winding space to reduce coil power consumption. Summary of the invention

[0005] In order to overcome the above technical problems, the purpose of the present application is to provide a magnetic circuit system and a high-voltage DC contactor with low coil power consumption.

[0006] In the first aspect, the present application provides a magnetic circuit system with low coil power consumption, which adopts the following technical solution: A magnetic circuit system with low coil power consumption, comprising a static component part and a dynamic component part, wherein the static component part is provided with a group of symmetrically distributed static contacts, and the dynamic component part comprises a push rod component, a yoke iron plate, a small spring, a moving iron core and a metal shell, one end of the push rod component is provided with a moving spring sheet, the end of the push rod component away from the moving spring sheet passes through the yoke iron plate, the small spring is penetrated through the push rod component and abuts against the yoke iron plate, the moving iron core is screwed to the push rod component and abuts against the end of the small spring away from the yoke iron plate, the metal shell is sleeved on the outer periphery of the moving iron core and fixed on the yoke iron plate, and the static component is sleeved on the The outer periphery of the push rod assembly is fixed on the yoke plate, and the static contact is arranged opposite to the moving spring sheet, and also includes a coil, a U-shaped yoke, a magnetic cylinder, a magnet and a static iron core, the static iron core is riveted to one end of the U-shaped yoke facing the yoke plate, the U-shaped yoke is located on one side of the moving iron core and riveted to the yoke plate, the magnet is sleeved on the static iron core, the magnetic cylinder is abutted against the magnet, the magnet is located between the static iron core and the magnetic cylinder, the side of the magnet facing the magnetic cylinder is the N pole, the side of the magnet facing the static iron core is the S pole, the coil is sleeved on the peripheral side of the magnetic cylinder, and the metal shell is inserted into the magnetic cylinder.

[0007] By adopting the above technical solution, the special polarity design and position layout of the magnetic steel can significantly enhance the magnetic field strength, thereby improving the action sensitivity of the moving iron core, thereby improving the electromagnetic attraction; when the coil is energized, the generated magnetic field interacts with the permanent magnetic field of the magnetic steel, further enhancing the attraction to the moving iron core, prompting the moving reed to quickly complete the attraction with the static contact. When the coil is de-energized, due to the uniqueness of the magnetic circuit design, the moving iron core can return to the initial position faster, allowing the moving reed to separate from the static contact in time, and realizing the accelerated release of the contactor contacts; this design makes full use of the limited space, effectively reduces the driving power consumption required by the coil, and thus shortens the response time, taking into account the requirements of miniaturization and high efficiency.

[0008] Optionally, a first boss is provided on the side of the static iron core facing the magnetic cylinder, and a first through hole is opened on the magnetic steel. When the magnetic steel is sleeved on the static iron core, the first boss is matched with the first through hole, and the height of the first boss is higher than the end face of the magnetic steel facing the magnetic cylinder.

[0009] By adopting the above technical solution, the cooperation between the first boss and the first through hole can accurately define the installation position of the magnetic steel in the axial direction of the coil, ensuring the stable assembly between the magnetic steel and the static iron core. At the same time, since the height of the first boss is higher than the end face of the magnetic steel facing the magnetic guide cylinder, when the coil is energized, the first boss can guide the magnetic circuit to be transmitted more concentratedly, thereby increasing the magnetic field strength and the attraction force, and accelerating the attraction speed of the contactor contacts; when the coil is de-energized, this structure helps to quickly change the magnetic circuit path, promote the resetting of the moving iron core, and achieve rapid release.

[0010] Optionally, when the coil is energized, the moving iron core pushes the push rod assembly to drive the moving spring sheet and the static contact to engage, and the moving iron core displaces along the direction of the push rod assembly; when the distance between the moving iron core and the yoke plate is smaller than the distance between the moving iron core and the static iron core, the magnetic circuit direction of the magnet passes through the moving iron core, the yoke plate, the U-shaped yoke and the static iron core in sequence.

[0011] By adopting the above technical solution, when the coil is energized, the moving iron core pushes the push rod assembly to drive the moving spring and the static contact to attract, thereby realizing the rapid attraction and conduction of the contactor. In this process, the moving iron core is displaced along the direction of the push rod assembly, so that the distance between the moving iron core and the yoke iron plate is smaller than the distance between the moving iron core and the static iron core, thereby changing the magnetic circuit path of the magnet. The direction of the magnetic circuit passes through the moving iron core, the yoke iron plate, the U-shaped yoke iron and the static iron core in turn, which optimizes the magnetic field distribution, enhances the electromagnetic attraction force, and further improves the attraction speed and reliability. This design effectively reduces the energy consumption during the attraction process and improves the overall performance of the high-voltage DC contactor.

[0012] Optionally, when the coil is de-energized, the moving iron core pushes the push rod to drive the moving spring sheet to disengage from the static contact. At this time, the moving iron core is offset along the direction of the static iron core. When the distance between the moving iron core and the yoke iron plate is greater than the distance between the moving iron core and the static iron core, the magnetic circuit direction of the magnet passes through the moving iron core and the first boss in sequence.

[0013] By adopting the above technical solution, when the coil is powered off, the moving iron core is reset under the action of the small spring, driving the push rod to separate the moving spring from the static contact, thereby realizing the rapid disconnection of the circuit. In this process, since the magnetic circuit direction of the magnetic steel is adjusted to pass through the moving iron core and the first boss in sequence, the magnetic field distribution is changed, further enhancing the reset driving force of the moving iron core, improving the efficiency and reliability of the release process, and effectively reducing the influence of residual magnetic force on the action stability.

[0014] Optionally, a gap is reserved between the first boss and the metal shell.

[0015] By adopting the above technical solution, the gap reserved between the first boss and the metal shell can ensure that the magnetic circuit part will not generate unnecessary friction or interference due to excessive contact between components during the assembly process, thereby ensuring the stability and reliability of the overall structure. At the same time, the design also helps to optimize the internal space layout, so that the yoke iron plate can fit more closely on the coil, further enhancing the electromagnetic conversion efficiency and reducing energy loss.

[0016] Optionally, a second boss is provided at one end of the static iron core facing the U-shaped yoke, a second through hole is provided on the U-shaped yoke, the second boss is crimped into the second through hole, and the second boss and the second through hole are interference fit.

[0017] By adopting the above technical solution, the connection between the static iron core and the U-shaped yoke is more stable and reliable. Specifically, the interference fit design between the second boss and the second through hole effectively increases the contact area and mechanical strength between the two, thereby enhancing the stability of the entire magnetic circuit structure and avoiding loosening due to vibration or impact. This improvement helps to ensure the performance consistency of the contactor during long-term use, especially under high-frequency attraction and release working conditions, which can significantly improve application reliability.

[0018] Optionally, the outer diameters of the magnetic cylinder, magnetic steel and static iron core are the same, a third through hole and a fourth through hole are opened in the center of the coil, the third through hole is connected to the fourth through hole, the inner diameter of the third through hole is larger than the inner diameter of the fourth through hole, a third boss is formed between the third through hole and the fourth through hole, the magnetic cylinder, magnetic steel and static iron core are jointly inserted into the third through hole and the magnetic cylinder abuts against the third boss, and the metal shell is inserted into the magnetic cylinder through the fourth through hole.

[0019] By adopting the above technical solution, the outer diameters of the magnetic tube, magnetic steel and static iron core are kept consistent, which can ensure that the three are precisely aligned during assembly, thereby improving the overall efficiency of the magnetic circuit. The third through hole and the fourth through hole designed in the center of the coil not only realize a reasonable structural layout, but also further optimize the assembly accuracy and stability between the components through the setting of the third boss. The metal shell is inserted into the magnetic tube through the fourth through hole, which effectively enhances the space utilization of the entire device, reduces unnecessary volume occupation, and makes the high-voltage DC contactor more compact and lightweight, adapting to the requirements of modern equipment for miniaturization. This design cleverly balances the relationship between magnetic field strength and component size, significantly reducing manufacturing costs and improving product reliability while ensuring strong electromagnetic attraction.

[0020] Optionally, a convex bulge and a limiting strip are provided on the side of the coil facing the yoke plate. When the coil is assembled, the limiting strip is parallel to the yoke plate and fits with the side of the yoke plate; the convex bulge abuts against the yoke plate.

[0021] By adopting the above technical solution, the limit strip is attached to the side of the yoke plate and remains parallel, effectively preventing the coil from rotating or shifting, ensuring the accuracy of its installation position; the convex bulge abuts against the yoke plate, further limiting the movement of the coil in the vertical direction, thereby improving the stability of the entire structure. This design not only simplifies the assembly process, but also improves the reliability and consistency of the product.

[0022] Optionally, a transient voltage suppression diode is further included, and a lead pin is provided on the coil, and the lead pin is connected to the transient voltage suppression diode.

[0023] By adopting the above technical solution, the transient voltage suppression diode can effectively absorb the reverse electromotive force generated by the coil at the moment of disconnection, avoiding high voltage from damaging other circuit components, thereby improving the reliability and safety of the entire high-voltage DC contactor.

[0024] In a second aspect, the present application provides a high-voltage DC contactor.

[0025] The high-voltage DC contactor provided in the present application includes the magnetic circuit system with low coil power consumption as described above.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. The special polarity design and position layout of the magnetic steel combined with the coordinated cooperation of the static iron core and the magnetic tube greatly improves the electromagnetic attraction, enabling the contactor to complete the attraction and release of the contacts in a short time, significantly improving the working reliability, effectively concentrating the magnetic field energy, reducing the energy input required by the coil, and reducing the coil drive power consumption while achieving strong electromagnetic attraction; 2. Reasonable space layout and component integration minimize the overall volume, meet the requirements of high-voltage DC contactors for miniaturization, and adapt to the application needs of small installation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 is a cross-sectional view of Example 1 of the present application; Figure 3 is an exploded view of Example 1 of the present application; Figure 4 This is a schematic diagram of the direction of the magnetic circuit when the moving iron core is attracted upward when the coil is energized in Example 1 of the present application; Figure 5This is a schematic diagram of the direction of the magnetic circuit when the moving iron core is released downward when the coil is powered off in Example 1 of the present application; Figure 6 It is a schematic diagram of the overall structure of Example 2 of the present application.

[0028] Description of reference numerals: 1. Static contact; 2. Push rod assembly; 3. Yoke plate; 4. Small spring; 5. Moving iron core; 6. Metal shell; 7. Moving reed; 8. Coil; 81. Third through hole; 82. Fourth through hole; 83. Third boss; 84. convex burl; 85. Limiting strip; 9. U-shaped yoke; 91. Second through hole; 10. Magnetic cylinder; 11. Magnetic steel; 111. First through hole; 12. Static iron core; 121. First boss; 122. Second boss; 13. Transient voltage suppression diode. DETAILED DESCRIPTION

[0029] The technical solution of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The present application can be embodied in many different forms and is not limited to the embodiments described here.

[0030] In the description of the present application, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics represented can be combined in any one or more embodiments or examples in a suitable manner.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection; it can also be a detachable connection; or integrated; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0033] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples shown in the present application.

[0034] Embodiment 1: A magnetic circuit system with low coil power consumption, see Figure 1 and Figure 2 , including a static component part and a dynamic component part, the static component part includes symmetrically distributed static contacts 1. The dynamic component part includes a push rod component 2, a yoke iron plate 3, a small spring 4, a moving iron core 5 and a metal shell 6. A moving spring piece 7 is fixed to one end of the push rod component 2, and the other end passes through the center of the yoke iron plate 3. The small spring 4 is sleeved on the push rod component 2 and abuts against the yoke iron plate 3. The moving iron core 5 is connected to the end of the push rod component 2 by threads and presses the small spring 4. The metal shell 6 is sleeved on the outer periphery of the moving iron core 5 and is laser welded to the yoke iron plate 3. The static component part is sleeved on the outer periphery of the push rod component 2, and the static component and the yoke iron plate 3 are fixed by laser welding. The static contact 1 and the moving spring piece 7 are arranged horizontally relative to each other.

[0035] See also Figure 2 and Figure 3 The magnetic circuit also includes a coil 8, a U-shaped yoke, a magnetic tube 10, a magnetic steel 11 and a static iron core 12. The static iron core 12 is riveted to the side of the U-shaped yoke facing the moving iron core 5 and is located at the center. The magnetic steel 11 is sleeved on the static iron core 12, and the magnetic tube 10 is crimped on the magnetic steel 11. The magnetic steel 11 is made of neodymium iron boron. The side facing the magnetic tube 10 is the N pole, and the side facing the static iron core 12 is the S pole. The coil 8 is sleeved on the outer periphery of the magnetic tube 10, and the metal shell 6 is inserted into the inner cavity of the magnetic tube 10.

[0036] Specifically, a first boss 121 is provided on the side of the static iron core 12 facing the magnetic guide cylinder 10, and a first through hole 111 matching the first boss 121 is provided on the magnetic steel 11. When the magnetic steel 11 is sleeved on the static iron core 12, the first boss 121 is matched with the first through hole 111. The cooperation between the first boss 121 and the first through hole 111 can accurately define the installation position of the magnetic steel 11 in the axial direction of the coil 8, ensuring the stable assembly between the magnetic steel 11 and the static iron core 12. At the same time, the height of the first boss 121 is higher than the end face of the magnetic steel 11 facing the magnetic guide cylinder 10. When the coil 8 is energized, the first boss 121 can guide the magnetic circuit to be transmitted more concentratedly, thereby improving the magnetic field strength and the attraction force, and accelerating the attraction speed of the contactor contacts; when the coil 8 is de-energized, this structure helps to quickly change the magnetic circuit path, promote the resetting of the moving iron core 5, and achieve rapid release.

[0037] At the same time, a second boss 122 is provided at one end of the static iron core 12 facing the U-shaped yoke 9, and a second through hole 91 is provided on the U-shaped yoke 9. The second boss 122 and the second through hole 91 are interference fit. The interference fit design of the second boss 122 and the second through hole 91 effectively improves the contact area and mechanical strength between the two, thereby enhancing the stability of the entire magnetic circuit structure and avoiding loosening due to vibration or impact. In order to further enhance the riveting stability of the two, it is also possible to consider setting a burr point on the inner wall of the U-shaped yoke located at the second through hole 91, and further enhance the riveting strength when the static iron core 12 is pressed into the riveting; after the static iron core 12 is pressed into the riveting, it is also possible to perform extrusion expansion riveting on the second boss 122, which can improve the riveting strength of the two. The above improvements help to ensure the performance consistency of the contactor during long-term use, especially in high-frequency attraction and release working conditions, which can significantly improve the application reliability.

[0038] In this embodiment, the outer diameters of the magnetic tube 10, the magnetic steel 11 and the static iron core 12 are the same, and a third through hole 81 and a fourth through hole 82 are provided at the center of the coil 8, which are connected and the inner diameter of the third through hole 81 is larger than that of the fourth through hole 82, forming a third boss 83. The magnetic tube 10, the magnetic steel 11 and the static iron core 12 are inserted into the third through hole 81 together to improve the overall efficiency of the magnetic circuit. The magnetic tube 10 abuts against the third boss 83, optimizing the assembly accuracy and stability between the components.

[0039] Specifically, a limit strip 85 and a convex bulge 84 are provided on the side of the coil 8 facing the yoke iron plate 3. The limit strip 85 is in contact with and parallel to the side of the yoke iron plate 3, effectively preventing the coil 8 from rotating or shifting, and ensuring the accuracy of its installation position. The convex bulge 84 abuts the yoke iron plate 3, further limiting the movement of the coil 8 in the vertical direction, thereby improving the stability of the entire structure. This design not only simplifies the assembly process, but also improves the reliability and consistency of the product.

[0040] It should be noted that the metal shell 6 is inserted into the magnetic cylinder 10 through the fourth through hole 82, and a gap is reserved between the first boss 121 and the metal shell 6, which can ensure that the magnetic circuit part will not produce unnecessary friction or interference due to excessive contact between parts during the assembly process, thereby ensuring the stability and reliability of the overall structure. At the same time, the design also helps to optimize the internal space layout, so that the yoke iron plate 3 can fit more closely on the coil 8, further enhancing the electromagnetic conversion efficiency and reducing energy loss.

[0041] See also Figure 4The attraction process (coil 8 is energized) of this embodiment is: when coil 8 is energized, the moving iron core 5 pushes the push rod assembly 2 to drive the moving spring 7 to attract the static contact 1, thereby realizing the rapid attraction and conduction of the contactor. In this process, when the distance between the moving iron core 5 and the yoke iron plate 3 is smaller than the distance between the moving iron core 5 and the static iron core 12, the magnetic circuit path of the magnetic steel 11 is changed. The direction of the magnetic circuit passes through the moving iron core 5, the yoke iron plate 3, the U-shaped yoke iron and the static iron core 12 in turn, which optimizes the magnetic field distribution, enhances the electromagnetic attraction force, and further improves the attraction speed and reliability.

[0042] See also Figure 5 The release process (coil 8 is powered off) of this embodiment is as follows: when the coil 8 is powered off, the moving iron core 5 is reset under the action of the small spring 4, driving the push rod to separate the moving spring 7 from the static contact 1, thereby realizing the rapid disconnection of the circuit. In this process, when the distance between the moving iron core 5 and the yoke iron plate 3 is greater than the distance between the moving iron core 5 and the static iron core 12, the magnetic circuit direction of the magnetic steel 11 will be adjusted to pass through the moving iron core 5 and the first boss 121 in sequence, so that the magnetic field distribution changes, further enhancing the reset driving force of the moving iron core 5, improving the efficiency and reliability of the release process, and effectively reducing the influence of residual magnetic force on the action stability.

[0043] It should be noted that Figure 4 and Figure 5 The arrow in the figure represents the direction of the magnetic circuit flow of the magnetic circuit part, which flows out from the N pole direction of the magnetic steel 11 and finally returns to the S pole of the magnetic steel 11 and flows into it.

[0044] The implementation principle of the embodiment of the present application is as follows: the special polarity design and position layout of the magnetic steel 11 can significantly enhance the magnetic field strength, thereby improving the action sensitivity of the moving iron core 5, thereby improving the electromagnetic attraction; when the coil 8 is energized, the generated magnetic field interacts with the permanent magnetic field of the magnetic steel 11, further enhancing the attraction to the moving iron core 5, prompting the moving reed 7 to quickly complete the attraction action with the static contact 1. When the coil 8 is powered off, due to the uniqueness of the magnetic circuit design, the moving iron core 5 can return to the initial position faster, so that the moving reed 7 and the static contact 1 are separated in time, and the contactor contacts are accelerated. Release; This design scheme makes full use of the limited space, effectively reduces the coil drive power consumption required by the coil 8, and thus shortens the response time, taking into account the requirements of miniaturization and high efficiency.

[0045] This embodiment also discloses a high-voltage DC contactor, which includes the magnetic circuit part described in the above embodiment.

[0046] Example 2, see Figure 6, and also includes a transient voltage suppression diode 13. A lead pin is provided on the coil 8, and the lead pin is connected to the transient voltage suppression diode 13 by soldering. The transient voltage suppression diode 13 can effectively absorb the reverse electromotive force generated by the coil 8 at the moment of disconnection, avoiding high voltage from causing damage to other components of the circuit, thereby improving the reliability and safety of the entire high-voltage DC contactor.

[0047] It should be noted that normal mechanical clearance tolerances are reserved between the various components of the present application, and no friction or interference will be caused during the operation. All dimensions conform to the mechanical design parameters, and the specific fitting tolerance values ​​are not described in detail.

[0048] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A magnetic circuit system with low power consumption of a coil, comprising a static component part and a dynamic component part, wherein the static component part is provided with a group of symmetrically distributed static contacts (1), the dynamic component part comprises a push rod component (2), a yoke iron plate (3), a small spring (4), a moving iron core (5) and a metal shell (6), one end of the push rod component (2) is provided with a moving spring (7), the end of the push rod component (2) away from the moving spring (7) passes through the yoke iron plate (3), and the small spring (4) is inserted into The push rod assembly (2) is in contact with the yoke iron plate (3), the moving iron core (5) is screwed to the push rod assembly (2) and in contact with one end of the small spring (4) away from the yoke iron plate (3), the metal shell (6) is sleeved on the outer periphery of the moving iron core (5) and fixed on the yoke iron plate (3), the static assembly is sleeved on the outer periphery of the push rod assembly (2) and fixed on the yoke iron plate (3), and the static contact (1) is arranged opposite to the moving spring sheet (7), characterized in that: It also comprises a coil (8), a U-shaped yoke (9), a magnetic tube (10), a magnetic steel (11) and a static iron core (12); the static iron core (12) is riveted to one end of the U-shaped yoke (9) facing the yoke plate (3); the U-shaped yoke (9) is located on one side of the moving iron core (5) and is riveted to the yoke plate (3); the magnetic steel (11) is sleeved on the static iron core (12); the magnetic tube (10) abuts against the magnetic steel (11); the magnetic steel (11) is located between the static iron core (12) and the magnetic tube (10); the side of the magnetic steel (11) facing the magnetic tube (10) is an N pole; the side of the magnetic steel (11) facing the static iron core (12) is an S pole; the coil (8) is sleeved on the circumferential side of the magnetic tube (10); and the metal shell (6) is inserted into the magnetic tube (10).

2. A magnetic circuit system with low coil power consumption according to claim 1, characterized in that: A first boss (121) is provided on a side of the static iron core (12) facing the magnetic cylinder (10), and a first through hole (111) is provided on the magnetic steel (11). When the magnetic steel (11) is sleeved on the static iron core (12), the first boss (121) is matched with the first through hole (111), and the height of the first boss (121) is higher than the end face of the magnetic steel (11) facing the magnetic cylinder (10).

3. A magnetic circuit system with low coil power consumption according to claim 2, characterized in that: When the coil (8) is energized, the moving iron core (5) pushes the push rod assembly (2) to drive the moving spring (7) to engage with the static contact (1), and at this time, the moving iron core (5) moves along the direction of the push rod assembly (2); when the distance between the moving iron core (5) and the yoke plate (3) is smaller than the distance between the moving iron core (5) and the static iron core (12), the magnetic circuit direction of the magnetic steel (11) passes through the moving iron core (5), the yoke plate (3), the U-shaped yoke and the static iron core (12) in sequence.

4. A magnetic circuit system with low coil power consumption according to claim 2, characterized in that: When the coil (8) is powered off, the moving iron core (5) pushes the push rod to drive the moving spring (7) to disengage from the static contact (1). At this time, the moving iron core (5) is offset in the direction of the static iron core (12). When the distance between the moving iron core (5) and the yoke iron plate (3) is greater than the distance between the moving iron core (5) and the static iron core (12), the magnetic circuit direction of the magnetic steel (11) passes through the moving iron core (5) and the first boss (121) in sequence.

5. A magnetic circuit system with low coil power consumption according to claim 2, characterized in that: A gap is reserved between the first boss (121) and the metal shell (6).

6. A magnetic circuit system with low coil power consumption according to claim 1, characterized in that: A second boss (122) is provided at one end of the static iron core (12) facing the U-shaped yoke (9), a second through hole (91) is provided on the U-shaped yoke (9), the second boss (122) is crimped into the second through hole (91), and the second boss (122) and the second through hole (91) are in interference fit.

7. A magnetic circuit system with low coil power consumption according to claim 1, characterized in that: The outer diameters of the magnetic tube (10), the magnetic steel (11) and the static iron core (12) are the same; a third through hole (81) and a fourth through hole (82) are provided at the center of the coil (8); the third through hole (81) is connected to the fourth through hole (82); the inner diameter of the third through hole (81) is larger than the inner diameter of the fourth through hole (82); a third boss (83) is formed between the third through hole (81) and the fourth through hole (82); the magnetic tube (10), the magnetic steel (11) and the static iron core (12) are inserted into the third through hole (81) together, and the magnetic tube (10) abuts against the third boss (83); the metal shell (6) is inserted into the magnetic tube (10) via the fourth through hole (82).

8. A magnetic circuit system with low coil power consumption according to claim 7, characterized in that: A convex lug (84) and a limiting strip (85) are provided on one side of the coil (8) facing the yoke iron plate (3); when the coil (8) is assembled, the limiting strip (85) is parallel to the yoke iron plate (3) and fits with the side edge of the yoke iron plate (3); and the convex lug (84) abuts against the yoke iron plate (3).

9. The magnetic circuit system with low coil power consumption according to claim 1, characterized in that: It also comprises a transient voltage suppression diode (13), and the coil (8) is provided with a lead pin, and the lead pin is connected to the transient voltage suppression diode (13).

10. High voltage DC contactor, characterized in that: It comprises a magnetic circuit system with low coil power consumption as described in any one of claims 1-9.

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