US-12620537-B2 - Magnetic circuit system with enhanced initial electromagnetic attraction and high-voltage DC relay

US12620537B2US 12620537 B2US12620537 B2US 12620537B2US-12620537-B2

Abstract

Disclosed in the present invention are a magnetic circuit part having an enhanced initial electromagnetic attraction force, and a high-voltage direct-current relay. The magnetic circuit part comprises a coil, a movable magnetic conductor and a static magnetic conductor, wherein the coil, the movable magnetic conductor and the static magnetic conductor are respectively mounted at suitable positions, such that a magnetic pole surface of the movable magnetic conductor and a magnetic pole surface of the static magnetic conductor are in opposite positions with a preset magnetic gap; and one of the two magnetic pole surfaces is provided with a protrusion that protrudes toward the other magnetic pole surface, and the other magnetic pole surface is provided, at a position corresponding to the protrusion, with a recess in which the protrusion of one of the magnetic pole surfaces can be embedded when the movable magnetic conductor and the static magnetic conductor attract each other. According to the present invention, the initial electromagnetic attraction force can be enhanced under the same volume and power consumption of the coil; or under the same initial electromagnetic attraction force, the volume of the coil is reduced, and the power consumption of the coil is decreased.

Inventors

Wenguang Dai
Liji SU
Meng Wang

Assignees

XIAMEN HONGFA ELECTRIC POWER CONTROLS CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20220708
Priority Date: 20210709

Claims (20)

1 . A magnetic circuit system with enhanced initial electromagnetic attraction, comprising: a movable magnetizer and a stationary magnetizer; the movable magnetizer and the stationary magnetizer being respectively provided at a suitable position, so that a magnetic pole surface of the movable magnetizer and a magnetic pole surface of the stationary magnetizer are in opposite positions with preset magnetic gaps, two magnetic pole surfaces correspondingly matched with each other are respectively in a ring shape and respectively has an inner ring and an outer ring; a coil, being provided at an adaptive position, so that the movable magnetizer moves towards the stationary magnetizer when the coil is energized; a reset spring, the reset spring is adapted between an intermediate portion of the movable magnetizer and an intermediate portion of the stationary magnetizer; wherein one of the two magnetic pole surfaces correspondingly matched with each other is provided with a protrusion protruding to the other magnetic pole surface, and a recess is provided in the other magnetic pole surface at a position corresponding to the protrusion, where the protrusion can be embedded into the recess when the movable magnetizer and the stationary magnetizer are attracted with each other; each of the protrusion and the recess has distances from the inner ring and the outer ring of corresponding magnetic pole surfaces; when the coil is energized, a direction of a resultant force of attractive forces between the protrusion and the recess generated on both sides of a vertical section in which the protrusion and the recess are matched with each other is always along a direction in which the movable magnetizer moves to the stationary magnetizer, and the protrusion is utilized to reduce a magnetic gap between the two magnetic pole surfaces at the protrusion, thereby reducing magnetic resistance and increasing initial electromagnetic attraction.
2 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein a top face of the protrusion is a plane, and in a state that the protrusion is fully embedded in the recess, gaps between side faces of the protrusion and corresponding side walls of the recess are completely identical, so that the direction of the resultant force of the attractive forces generated between the protrusion and the recess when the coil is energized is always along the direction in which the movable magnetizer moves to the stationary magnetizer.
3 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 2 , wherein a distance from a side edge of the top face of the protrusion to a side edge of a corresponding notch of the recess is smaller than the preset magnetic gap between the two magnetic pole surfaces.
4 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 3 , wherein in the state that the protrusion is totally embedded in the recess, a gap between the side face of the protrusion and the side wall of the recess is not smaller than a distance between the top face of the protrusion and a bottom face of the recess, and the distance between the top face of the protrusion and the bottom face of the recess is not smaller than a distance between two magnetic pole surfaces.
5 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein the side face of the protrusion is one or a combination of more than two of a vertical surface, an inclined surface and a curved surface, and in the vertical section, the two side faces of the protrusion are symmetrical.
6 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein there are one or more protrusions on one magnetic pole surface, and there are one or more recesses on the other magnetic pole surface at a corresponding position.
7 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 6 , wherein a sum of areas of the top faces of the protrusions on the magnetic pole surface is less than a remaining area of the magnetic pole surface removed all of the protrusions.
8 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein the protrusion is a separate part, and the protrusion is fixed on the magnetic pole surface.
9 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein the protrusion is an integral structure formed on the magnetic pole surface.
10 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein the protrusion is in a protruding shaft shape.
11 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein the protrusion is in a strip shape.
12 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein the protrusion is linear, arc-shaped or annular.
13 . The magnetic circuit system with enhanced initial electromagnetic attraction according to claim 1 , wherein the movable magnetizer is a movable core, and the stationary magnetizer is a stationary core or a yoke plate.
14 . A high-voltage DC relay, comprising a magnetic circuit system with enhanced initial electromagnetic attraction comprising: a movable magnetizer and a stationary magnetizer; the movable magnetizer and the stationary magnetizer being respectively provided at a suitable position, so that a magnetic pole surface of the movable magnetizer and a magnetic pole surface of the stationary magnetizer are in opposite positions with preset m retic gaps, two magnetic pole surfaces correspondingly matched with each other are respectively in a ring shape and respectively has an inner ring and an outer ring; a coil, being provided at an adaptive position, so that the moveable magnetizer moves towards the stationary magnetizer when the coil is energized; a reset spring, the reset spring is adapted between an intermediate portion of the movable magnetizer and an intermediate portion of the stationary magnetizer; wherein one of the two magnetic pole surfaces correspondingly matched with each other is provided with a protrusion protruding to the other magnetic pole surface, and a recess is provided in the other magnetic pole surface at a position corresponding to the protrusion, where the protrusion can be embedded into the recess when the moveable magnetizer and the stationary magnetizer are attracted with each other; each of the protrusion and the recess has distances from the inner ring and the outer ring of corresponding magnetic pole surfaces; when the coil is energized, a direction of a resultant force of attractive forces between the protrusion and the recess generated on both sides of a vertical section in which the protrusion and the recess are matched with each other is always along a direction in which the moveable magnetizer moves to the stationary magnetizer, and the protrusion is utilized to reduce a magnetic resistance and increasing initial electromagnetic attraction.
15 . The high-voltage DC relay according to claim 14 , wherein a top face of the protrusion is a plane, and in a state that the protrusion is fully embedded in the recess, gaps between side faces of the protrusion and corresponding side walls of the recess are completely identical, so that the direction of the resultant force of the attractive forces generated between the protrusion and the recess when the coil is energized is always along the direction in which the moveable magnetizer moves to the stationary magnetizer.
16 . The high-voltage DC relay according to claim 15 , wherein a distance from a side edge of the top face of the protrusion to a side edge of a corresponding notch of the recess is smaller than the preset magnetic gap between the two magnetic pole surfaces.
17 . The high-voltage DC relay according to claim 16 , wherein in the state that the protrusion is totally embedded in the recess, a gap between the side face of the protrusion and the side wall of the recess is not smaller than a distance between the top face of the protrusion and a bottom face of the recess, and the distance between the top face of the protrusion and the bottom face of the recess is not smaller than a distance between two magnetic pole surfaces.
18 . The high-voltage DC relay according to claim 14 , wherein the side fac of the protrusion is one or a combination of more than two of a vertical surface, an inclined surface and a curved surface, and in the vertical section, the two side faces of the protrusion are symmetrical.
19 . The high-voltage DC relay according to claim 14 , wherein there are one or mor protrusions on one magnetic pole surface, and there are one or more recesses on the other magnetic pole surface at a corresponding position.
20 . The high-voltage DC relay according to claim 19 , wherein a sum of areas of the top faces of the protrusions on the magnetic pole surface is less than a remaining area of the magnetic pole surface removed all of the protrusions.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a national stage of International PCT Application No. PCT/CN2022/104680, filed on Jul. 8, 2022, which claims priority to Chinese Patent Applications No. 202110779803.1, 202110780418.9 and 202121565706.4 filed on Jul. 9, 2021, the contents of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD The present disclosure relates to the technical field of relays, in particular to a magnetic circuit system with enhanced initial electromagnetic attraction and a high-voltage DC relay. BACKGROUND A relay is an electronic control device that consists of a control system (also known as an input loop) and a controlled system (also known as an output loop). It is commonly used in automatic control circuits. Essentially, it acts as an automatic switch that employs a small current to control a larger current, enabling functions such as automatic adjustment, safety protection, and circuit conversion. A high-voltage DC relay is specifically designed to handle high power. It offers unparalleled reliability and a longer service lifespan compared to conventional relays, making it extensively utilized in various fields, including the automotive industry, particularly in a realm of new energy vehicles. On one hand, as a driving range of the new energy vehicle increases, the battery capacity and the short-circuit current of a battery pack also increase. This necessitates a high-voltage DC relay to possess robust anti-short-circuit ability. On the other hand, there is a demand for reducing power consumption in the high-voltage DC relay to minimize energy loss. Moreover, with the growing need for space optimization in the new energy vehicle, there is a requirement for the high-voltage DC relay to have a smaller dimension. In general, the high-voltage DC relay used in the new energy vehicle is expected to exhibit strong electromagnetic attraction, low drive power consumption, and compact size. However, the existing designs face a contradiction between the need for a powerful electromagnetic attraction to withstand short-circuit current, which requires larger coil winding space and higher coil driving power consumption, and the desire for a smaller size and lower power consumption in high-voltage DC relays. This contradiction hinders an effective application of the high-voltage DC relay in the fields such as the new energy vehicle. SUMMARY A magnetic circuit system with enhanced initial electromagnetic attraction, comprising a coil, a movable magnetizer, a reset spring and a stationary magnetizer: the coil, the movable magnetizer and the stationary magnetizer being respectively provided at an adaptive position, so that a magnetic pole surface of the movable magnetizer and a magnetic pole surface of the stationary magnetizer are in opposite positions with preset magnetic gaps, and the movable magnetizer moves towards the stationary magnetizer when the coil is energized: the reset spring is adapted between an intermediate portion of the movable magnetizer and an intermediate portion of the stationary magnetizer, and the two magnetic pole surfaces correspondingly matched with each other are respectively in a ring shape and respectively has an inner ring and an outer ring: wherein one of the two magnetic pole surfaces correspondingly matched with each other is provided with a protrusion protruding to the other magnetic pole surface, and a recess is provided in the other magnetic pole surface at a position corresponding to the protrusion, where the protrusion can be embedded into the recess when the movable magnetizer and the stationary magnetizer are attracted with each other: each of the protrusion and the recess has distances from the inner ring and the outer ring of corresponding magnetic pole surfaces: when the coil is energized, a direction of a resultant force of attractive forces between the protrusion and the recess generated on both sides of a vertical section in which the protrusion and the recess are matched with each other is always along a direction in which the movable magnetizer moves to the stationary magnetizer, and the protrusion is utilized to reduce a magnetic gap between the two magnetic pole surfaces at the protrusion, thereby reducing magnetic resistance and increasing initial electromagnetic attraction. According to an embodiment of the present disclosure, a top face of the protrusion is a plane, and in a state that the protrusion is fully embedded in the recess, gaps between side faces of the protrusion and corresponding side walls of the recess are completely identical, so that the direction of the resultant force of the attractive forces generated between the protrusion and the recess when the coil is energized is always along the direction in which the movable magnetizer moves to the stationary magnetizer. According to an embodiment of the present disclosure, a distance from a side edge of the top face of the protrusion to a sid