US-20260128246-A1 - ELECTROMAGNETIC DRIVING UNIT AND RELAY

US20260128246A1US 20260128246 A1US20260128246 A1US 20260128246A1US-20260128246-A1

Abstract

An electromagnetic driving unit includes a bobbin having an inner hole; a coil wound on the bobbin; a movable attraction member disposed in the inner hole; and a static attraction member disposed at an end of the inner hole and opposite to the movable attraction member. A plane perpendicular to an axial direction of the inner hole is a projection plane; an orthographic projection area of the movable attraction member on the projection plane is a first projection area; an orthographic projection area of the static attraction member on the projection plane is a second projection area; and the second projection area is larger than the first projection area.

Inventors

Wenguang Dai
Meng Wang
Liji SU

Assignees

XIAMEN HONGFA ELECTRIC POWER CONTROLS CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20230627
Priority Date: 20220713

Claims (19)

1 . An electromagnetic driving unit, comprising: a bobbin having an inner hole; a coil wound on the bobbin; a movable attraction member disposed in the inner hole; and a static attraction member disposed at an end of the inner hole and opposite to the movable attraction member, wherein a plane perpendicular to an axial direction of the inner hole is a projection plane; an orthographic projection area of the movable attraction member on the projection plane is a first projection area; an orthographic projection area of the static attraction member on the projection plane is a second projection area; and the second projection area is larger than the first projection area.
2 . The electromagnetic driving unit according to claim 1 , wherein the static attraction member comprises a static iron core, and the static iron core has a radially augmented portion with a radial size larger than a radial size of the movable attraction member; or the static attraction member comprises a static iron core and a magnetic conductive ring, and the magnetic conductive ring is sleeved on a periphery of the static iron core.
3 . The electromagnetic driving unit according to claim 1 , wherein the static attraction member comprises a static iron core and a magnetic conductive ring, the magnetic conductive ring is sleeved on a periphery of the static iron core, and a projection area of the static iron core on the projection plane is consistent with the first projection area of the movable attraction member.
4 . The electromagnetic driving unit according to claim 2 , further comprising a straight line-shaped yoke plate, a U-shaped yoke, and a magnetic conductive cylinder, wherein the yoke plate and the U-shaped yoke are fixedly connected to form a square frame surrounding the coil; the magnetic conductive cylinder is fixedly to the U-shaped yoke and extends towards the yoke plate, and a length of the magnetic conductive cylinder extending towards the yoke plate is less than a height of the U-shaped yoke, to form a space between the magnetic conductive cylinder and the yoke plate; the magnetic conductive cylinder is sleeved on a periphery of the movable attraction member; and the radially augmented portion or the magnetic conductive ring is disposed in the space.
5 . The electromagnetic driving unit according to claim 4 , wherein the static iron core is an independent member and is fixedly connected to the yoke plate; or the static iron core and the yoke plate are integrally formed.
6 . The electromagnetic driving unit according to claim 2 , wherein the radially augmented portion is a tapered or stepped structure that contracts in a direction towards the movable attraction member or in a direction away from the movable attraction member.
7 . The electromagnetic driving unit according to claim 2 , wherein the magnetic conductive ring is a tapered or stepped structure that contracts in a direction towards the movable attraction member or in a direction away from the movable attraction member.
8 . The electromagnetic driving unit according to claim 4 , further comprising a sealing cylinder configured to seal and cover the movable attraction member, wherein a flange is provided at a cylinder opening of the sealing cylinder, the flange abuts against and is fixed on the yoke plate, and the sealing cylinder is provided with a radially outward expanding portion configured to accommodate the radially augmented portion or the magnetic conductive ring.
9 . The electromagnetic driving unit according to claim 4 , further comprising a sealing cylinder configured to seal and cover the movable attraction member, wherein a flange is provided at a cylinder opening of the sealing cylinder, the sealing cylinder is a straight cylinder with equal diameters in each section along an axial direction, and the flange abuts against and is fixed on the radially augmented portion.
10 . The electromagnetic driving unit according to claim 4 , further comprising a sealing cylinder configured to seal and cover the movable attraction member, wherein a flange is provided at a cylinder opening of the sealing cylinder, the sealing cylinder is a straight cylinder with equal diameters in each section along an axial direction, the flange abuts against and is fixed on the yoke plate, and the magnetic conductive ring is sleeved and fixed on the sealing cylinder.
11 . The electromagnetic driving unit according to claim 1 , wherein the movable attraction member is a columnar structure with equal diameters in each section along an axial direction.
12 . A relay comprising a contact part for implementing a switching function and an electromagnetic driving unit for driving a contact part of the relay to perform a switching action, wherein the electromagnetic driving unit comprises: a bobbin having an inner hole; a coil wound on the bobbin; a movable attraction member disposed in the inner hole; and a static attraction member disposed at an end of the inner hole and opposite to the movable attraction member, wherein a plane perpendicular to an axial direction of the inner hole is a projection plane; an orthographic projection area of the movable attraction member on the projection plane is a first projection area; an orthographic projection area of the static attraction member on the projection plane is a second projection area; and the second projection area is larger than the first projection area.
13 . The relay according to claim 12 , wherein the static attraction member comprises a static iron core, and the static iron core has a radially augmented portion with a radial size larger than a radial size of the movable attraction member; or the static attraction member comprises a static iron core and a magnetic conductive ring, and the magnetic conductive ring is sleeved on a periphery of the static iron core.
14 . The relay according to claim 12 , wherein the static attraction member comprises a static iron core and a magnetic conductive ring, the magnetic conductive ring is sleeved on a periphery of the static iron core, and a projection area of the static iron core on the projection plane is consistent with the first projection area of the movable attraction member.
15 . The relay according to claim 13 , wherein the electromagnetic driving unit further comprises a straight line-shaped yoke plate, a U-shaped yoke, and a magnetic conductive cylinder, wherein the yoke plate and the U-shaped yoke are fixedly connected to form a square frame surrounding the coil; the magnetic conductive cylinder is fixedly to the U-shaped yoke and extends towards the yoke plate, and a length of the magnetic conductive cylinder extending towards the yoke plate is less than a height of the U-shaped yoke, to form a space between the magnetic conductive cylinder and the yoke plate; the magnetic conductive cylinder is sleeved on a periphery of the movable attraction member; and the radially augmented portion or the magnetic conductive ring is disposed in the space.
16 . The relay according to claim 15 , wherein the static iron core is an independent member and is fixedly connected to the yoke plate; or the static iron core and the yoke plate are integrally formed.
17 . The relay according to claim 13 , wherein the radially augmented portion is a tapered or stepped structure that contracts in a direction towards the movable attraction member or in a direction away from the movable attraction member.
18 . The relay according to claim 13 , wherein the magnetic conductive ring is a tapered or stepped structure that contracts in a direction towards the movable attraction member or in a direction away from the movable attraction member.
19 . The relay according to claim 15 , wherein the electromagnetic driving unit further comprising a sealing cylinder configured to seal and cover the movable attraction member, wherein a flange is provided at a cylinder opening of the sealing cylinder, the flange abuts against and is fixed on the yoke plate, and the sealing cylinder is provided with a radially outward expanding portion configured to accommodate the radially augmented portion or the magnetic conductive ring.

Description

CROSS REFERENCE The present disclosure is a national stage of International PCT Application No. PCT/CN2023/102881, filed on Jun. 27, 2023, which claims priority to Chinese Patent Application No. 202210818439. X, filed on Jul. 13, 2022. The content of forgoing applications is incorporated herein by reference in its entirety. TECHNICAL FIELD The present disclosure relates to a field of relay manufacturing and, in particular, to an electromagnetic driving unit and a relay. BACKGROUND A relay is an electronic control device that has a control system (also known as an input loop) and a controlled system (also known as an output loop), and is typically applied to an automatic control circuit. In the circuit, the relay plays a role in automatic regulation, safety protection, circuit switching and so on. With the continuous expansion of usage scenarios of the relay, a high-voltage direct current relay in the related art generally requires characteristics of strong electromagnetic attraction force, low driving power consumption and small volume, and conventional means for enhancing the electromagnetic attraction force in the art is to increase coil winding space and coil driving power of a magnetic circuit part of the relay, but this is contrary to the requirements of low driving power consumption and small volume of the relay. Therefore, how to enhance the electromagnetic attraction force of the relay under the requirements of low driving power consumption and small volume is one of the urgent problems in the art. SUMMARY According to an aspect of the present disclosure, an electromagnetic driving unit includes a bobbin having an inner hole; a coil wound on the bobbin; a movable attraction member disposed in the inner hole; and a static attraction member disposed at an end of the inner hole and opposite to the movable attraction member. A plane perpendicular to an axial direction of the inner hole is a projection plane; an orthographic projection area of the movable attraction member on the projection plane is a first projection area; an orthographic projection area of the static attraction member on the projection plane is a second projection area; and the second projection area is larger than the first projection area. According to an embodiment of the present disclosure, the static attraction member includes a static iron core, and the static iron core has a radially augmented portion with a radial size larger than a radial size of the movable attraction member; or the static attraction member includes a static iron core and a magnetic conductive ring, and the magnetic conductive ring is sleeved on a periphery of the static iron core. According to an embodiment of the present disclosure, the static attraction member includes a static iron core and a magnetic conductive ring, the magnetic conductive ring is sleeved on a periphery of the static iron core, and a projection area of the static iron core on the projection plane is consistent with the first projection area of the movable attraction member. According to an embodiment of the present disclosure, the electromagnetic driving unit further includes a straight line-shaped yoke plate, a U-shaped yoke, and a magnetic conductive cylinder. The yoke plate and the U-shaped yoke are fixedly connected to form a square frame surrounding the coil; the magnetic conductive cylinder is fixedly to the U-shaped yoke and extends towards the yoke plate, and a length of the magnetic conductive cylinder extending towards the yoke plate is less than a height of the U-shaped yoke, to form a space between the magnetic conductive cylinder and the yoke plate; the magnetic conductive cylinder is sleeved on a periphery of the movable attraction member; and the radially augmented portion or the magnetic conductive ring is disposed in the space. According to an embodiment of the present disclosure, the static iron core is an independent member and is fixedly connected to the yoke plate; or the static iron core and the yoke plate are integrally formed. According to an embodiment of the present disclosure, the radially augmented portion is a tapered or stepped structure that contracts in a direction towards the movable attraction member or in a direction away from the movable attraction member. According to an embodiment of the present disclosure, the magnetic conductive ring is a tapered or stepped structure that contracts in a direction towards the movable attraction member or in a direction away from the movable attraction member. According to an embodiment of the present disclosure, the electromagnetic driving unit further includes a sealing cylinder configured to seal and cover the movable attraction member. A flange is provided at a cylinder opening of the sealing cylinder, the flange abuts against and is fixed on the yoke plate, and the sealing cylinder is provided with a radially outward expanding portion configured to accommodate the radially augmented portion or the magnetic cond