CN213781970U

CN213781970U - Circuit breaker

Info

Publication number: CN213781970U
Application number: CN202022604920.8U
Authority: CN
Inventors: 时培欣; 陈闯; 郑荣; 朱晓慧
Original assignee: Eaton Electric Ltd
Current assignee: Eaton Electric Ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-07-23
Anticipated expiration: 2030-11-12
Also published as: EP4009342A2; EP4009342A3

Abstract

The utility model provides a circuit breaker, it includes the base that at least part extends along the horizontal direction, still includes explosion chamber, static contact, moving contact and increases magnetic assembly. The magnetism increasing assembly comprises a first magnetism increasing cavity and a second magnetism increasing cavity, wherein the first magnetism increasing cavity and the second magnetism increasing cavity are both made of materials which cannot conduct electricity and cannot conduct magnetism, the first magnetism increasing cavity and the second magnetism increasing cavity are arranged on two transverse sides of the reverse base body oppositely, the first magnetism increasing cavity and the second magnetism increasing cavity at least extend to cover one part of the static contact in the longitudinal direction of the reverse base body and at least extend to exceed the static contact in the vertical direction, the magnetism increasing assembly further comprises magnetic conducting materials, and the magnetic conducting materials are filled into cavities of the first magnetism increasing cavity and the second magnetism increasing cavity. The circuit breaker with the above configuration can realize that electromagnetic force towards the arc extinguishing chamber direction is exerted on the arc on the side of the arc, which is away from the arc extinguishing chamber, thereby further pushing the arc to move towards the arc extinguishing chamber.

Description

Circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus especially relates to circuit breaker.

Background

The circuit breaker is applied to the field of power distribution and mainly comprises a base, a moving contact, a fixed contact and an arc extinguish chamber, wherein the moving contact, the fixed contact and the arc extinguish chamber are installed on the base, the circuit breaker realizes the connection and disconnection of current through the connection and disconnection between the moving contact of the moving contact and the fixed contact of the fixed contact, and when a line is overloaded or short-circuited, the moving contact is separated from the fixed contact under the action of a protection unit so as to generate electric arc.

In order to quickly extinguish the generated arc, it is desirable that the arc is quickly transferred from between the moving contact and the stationary contact to the arc extinguishing chamber. In the prior art, magnetic blowing and gas blowing are generally used for achieving the purposes, but devices or materials for magnetic blowing and gas blowing are generally arranged on one side of an electric arc to be generated, which is close to an arc extinguishing chamber, for example, the electric arc is arranged in the arc extinguishing chamber, so that the electric arc can be influenced by a magnetic field and gas after moving for a certain distance. Although the arrangement can also achieve the aim of accelerating the arc extinction, people still hope to obtain better magnetic blowing and air blowing effects so as to further improve the breaking index of the circuit breaker.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a circuit breaker, it exerts the electromagnetic force towards the explosion chamber direction to electric arc with the help of increasing the magnetism subassembly in one side that deviates from the explosion chamber of electric arc, further promotes electric arc towards the explosion chamber motion from this, has improved the speed that electric arc transferred the explosion chamber from the contact.

The utility model provides a circuit breaker, it includes the base that at least part extends along the horizontal direction, still includes explosion chamber, static contact, moving contact and increases magnetic assembly. Wherein the arc chute is fixedly mounted to the base. The static contact comprises a forward base body which extends along the longitudinal direction and is fixedly connected to a horizontal extending area of the base below the arc extinguish chamber, and further comprises a reverse base body which extends upwards from one longitudinal end of the forward base body and then extends reversely to the forward base body until the free end of the reverse base body reaches one side of the arc extinguish chamber, wherein a static contact is arranged on the upper surface of the reverse base body, and an arc striking piece leading to the arc extinguish chamber is installed at the free end of the reverse base body. The movable contact comprises a movable contact which is designed to be rotatably arranged above the reverse base body by means of a driving mechanism and a transmission mechanism relative to the base so as to be engaged with or separated from the fixed contact by means of the movable contact. The magnetism increasing assembly comprises a first magnetism increasing chamber and a second magnetism increasing chamber, wherein the first magnetism increasing chamber and the second magnetism increasing chamber are made of materials which are not conductive and not conductive, the first magnetism increasing chamber and the second magnetism increasing chamber are arranged on two transverse sides of the reverse base body in an opposite mode, the first magnetism increasing chamber and the second magnetism increasing chamber at least extend to cover a part of the fixed contact in the longitudinal direction of the reverse base body and at least extend to exceed the fixed contact in the vertical direction so as to allow at least a part of electric arcs generated between the fixed contact and the movable contact to fall into a space enclosed by the first magnetism increasing chamber and the second magnetism increasing chamber, and the magnetism increasing assembly further comprises magnetic conductive materials which are filled into cavities of the first magnetism increasing chamber and the second magnetism increasing chamber. The circuit breaker with the above configuration can apply electromagnetic force towards the arc extinguishing chamber to the arc on the side of the arc away from the arc extinguishing chamber, and can apply larger ampere force to the arc.

Preferably, the magnetism increasing assembly further includes a third magnetism increasing chamber, the third magnetism increasing chamber is also made of a material which is not conductive and is not conductive to electricity, the third magnetism increasing chamber is designed to be vertically arranged between the forward base body and the reverse base body and arranged between the first magnetism increasing chamber and the second magnetism increasing chamber along the transverse direction of the reverse base body so as to connect the first magnetism increasing chamber and the second magnetism increasing chamber, wherein the first magnetism increasing chamber, the second magnetism increasing chamber and the third magnetism increasing chamber are communicated with each other and jointly form a U-shaped cavity, and the magnetic conductive material is stacked in the U-shaped cavity along the longitudinal direction of the reverse base body in a U-shaped magnetism increasing sheet form and is accommodated in the U-shaped cavity in a shape-fitting manner. The third magnetism increasing cavity can further increase the magnetic field intensity of the arc area.

Preferably, the magnetizing assembly further comprises a support portion also made of a material that is not electrically and magnetically conductive, the support portion comprising a support body designed to extend from the third magnetizing chamber towards the longitudinal other end of the forward base until reaching or exceeding the free end of the reverse base, wherein the support body is vertically dimensioned to allow a lower surface thereof to abut against an upper surface of the forward base and an upper surface thereof for the lower surface of the reverse base to abut against. The support portion having the above configuration can prevent the free end of the counter base from being deformed in the vertical direction.

Preferably, the support portion further includes two lateral limiting protrusions extending from the upper surface of the support main body, a lateral dimension between the two lateral limiting protrusions is designed to allow at least the free end of the reverse base body to be accommodated therein so as to prevent the free end of the reverse base body from laterally displacing, the support portion further includes a positioning boss extending from the lower surface of the support main body, and a positioning recess is formed on the upper surface of the forward base body, wherein the positioning recess is dimensioned to allow the positioning boss to be inserted therein so as to limit the displacement of the support portion relative to the stationary contact. The support portion having the above-described configuration can prevent the free end of the counter substrate from being deformed in the lateral direction.

Preferably, at least a portion of the outer shell of one or more of the first, second and third magnetism-increasing chambers is made of a gas-generating material.

Preferably, the first magnetizing chamber, the second magnetizing chamber, the third magnetizing chamber and the supporting part are an integral piece, wherein insulating paper is laid between the magnetizing assembly and the upper surface of the forward base body.

Preferably, the transmission mechanism includes a mounting base, a movable contact support, a spring, an upper spring shaft, a lower spring shaft, and a mounting screw, the mounting base includes a fixed portion fixedly connected to the base and an annular mounting member extending from the fixed portion toward the movable contact support, the movable contact support is configured to include a first support plate and a second support plate which are arranged on both sides of the annular mounting member and extend parallel to each other, an end portion of the movable contact far from the movable contact thereof is arranged between the first support plate and the annular mounting member and/or between the second support plate and the annular mounting member, an end portion of the movable contact far from the movable contact thereof is provided with a movable contact rotation hole, the first support plate is provided with a first rotation hole, the second support plate is provided with a second rotation hole, the movable contact rotation hole, The first and second swivel holes are connected to the ring mount rotatably relative to and in close proximity to each other by means of mounting screws.

Preferably, the upper edge of the first support plate includes a first upper arc-shaped lower concave section and a first upper arc-shaped upper convex section extending next to the first upper arc-shaped lower concave section, the lower edge of the first support plate includes a first lower arc-shaped lower concave section, the upper edge of the second support plate includes a second upper arc-shaped lower concave section and a second upper arc-shaped upper convex section extending next to the second upper arc-shaped lower concave section, the lower edge of the second support plate includes a second lower arc-shaped lower concave section, a long waist hole is opened on the movable contact between the movable contact and the movable contact rotation hole, the upper spring shaft is designed to pass through the long waist hole and its both ends are lapped over the first upper arc-shaped lower concave section and the second upper arc-shaped lower concave section, the lower spring shaft is designed to be accommodated in the first lower arc-shaped lower concave section edge and the second lower arc-shaped lower concave section, the lower spring shaft is connected to the upper spring shaft by means of the spring, wherein the first upper arc upper convex section and the second upper arc upper convex section are dimensioned to allow the upper spring shaft to disengage from the first upper arc lower concave section and the second upper arc lower concave section and continue to move along the first upper arc upper convex section and the second upper arc upper convex section when the movable contact rotates relative to the movable contact support, the first upper arc upper convex section and the second upper arc upper convex section having the same center of circle as the first lower arc lower concave section and the second lower arc lower concave section, respectively. The movable contact support with the above configuration can prevent the movable contact from repelling and falling back.

Preferably, the first upper arc-shaped lower recess section and the second upper arc-shaped lower recess section are symmetrically arranged with respect to the ring mount, the first upper arc-shaped upper projection section and the second upper arc-shaped upper projection section are symmetrically arranged with respect to the ring mount, and the first lower arc-shaped lower recess section and the second lower arc-shaped lower recess section are symmetrically arranged with respect to the ring mount.

Preferably, the movable contact comprises a first movable contact element and a second movable contact element, wherein an end of the first movable contact element away from the movable contact is clamped between the first support plate and the annular mounting member, an end of the second movable contact element away from the movable contact is clamped between the second support plate and the annular mounting member, the spring is arranged between the first movable contact element and the second movable contact element, shaft sleeves are respectively sleeved at two ends of the upper spring shaft, a first driving hole and a second driving hole are respectively formed in the first support plate and the second support plate, and the driving mechanism drives the movable contact support to rotate relative to the mounting base by means of the first driving hole and the second driving hole.

Drawings

Fig. 1 is a schematic diagram of a circuit breaker according to the present invention, wherein the magnetizing assembly is omitted;

fig. 2 is a schematic diagram of a circuit breaker according to the present invention, wherein a magnetizing assembly is shown;

fig. 3 is an assembly schematic view of the magnetism increasing assembly and the static contact from an angle;

fig. 4 is an assembly schematic view of the magnetism increasing assembly and the static contact from another angle;

FIG. 5 is a schematic view of the field enhancing assembly from an angle;

FIG. 6 is a schematic view of the field enhancing assembly from another angle;

fig. 7 is an assembly schematic view of the movable contact and the transmission mechanism;

fig. 8 is a schematic view of a first movable contact element or a second movable contact element;

fig. 9 is a schematic view of a movable contact support;

fig. 10 is a schematic view of a first brace panel.

List of reference numerals

1. A magnetism increasing component; 11. a first magnetism increasing chamber; 12. a second magnetizing chamber; 13. a third magnetism increasing chamber; 14. a support portion; 141. a support body; 142. a transverse limiting protrusion; 143. positioning the boss; 15, U-shaped magnetism increasing sheets; 16. a gas generating material; 2. static contact; 21. a forward substrate; 22. a reverse substrate; 23. a stationary contact; 24. an arc striking member; 25. a positioning notch; 26. insulating paper; 3. a moving contact; 31. a first movable contact element; 32. a second movable contact element; 33. a movable contact; 34. a moving contact rotating hole; 35. a long waist hole; 4. an arc extinguishing chamber; 5. installing a base; 51. a fixed portion; 52. an annular mounting member; 6. a moving contact support; 61. a first brace plate; 611. a first rotation hole; 612. a first upper arcuate lower concave section; 613. a first upper arc upper convex section; 614. a first lower arc lower concave section; 615. a first drive aperture; 62. a second bracket plate; 621. a second upper arcuate lower concave section; 622. a second upper arc upper convex section; 63. mounting screws; 7. a spring; 8. an upper spring shaft; 9. a lower spring shaft; 10. and a shaft sleeve.

Detailed Description

Referring now to the drawings, illustrative aspects of the disclosed structure will be described in detail. Although the drawings are provided to present embodiments of the invention, the drawings are not necessarily to scale of particular embodiments, and certain features may be exaggerated, minimized, or removed to better illustrate and explain the present disclosure.

Certain directional terms used hereinafter to describe the accompanying drawings should be understood to have their normal meanings and to refer to those directions as they normally relate to when viewing the drawings. Where "longitudinal" refers to the length direction of an object, "transverse" refers to the width direction of an object, and "up" and "down" refer to above and below when viewed at an angle approximately in 1.

The utility model provides a circuit breaker, it includes base (not shown), explosion chamber 4, static contact 2 and moving contact 3, and the position of arranging of these four parts can be seen in fig. 1, and wherein explosion chamber 4 mainly includes arc extinguishing bars piece and installation curb plate, does not show the installation curb plate for the sake of clarity in this text. In particular, the arc extinguishing chamber 4 is fixedly mounted to said base. The stationary contact 2 comprises a forward base 21 and a reverse base 22, the bases having at least one region extending in a horizontal direction, the forward base 21 being arranged below the arc extinguishing chamber 4 and being fixedly connected to the horizontally extending region of the bases. The forward base 21 extends in its longitudinal direction, and the counter base 22 extends upward from one longitudinal end of the forward base 21 and then extends opposite the forward base 21 until its free end reaches the side of the arc chute 4. It should be noted here that the extension of the reverse base 22 opposite to the forward base 21 does not mean that the extension directions of the two are absolutely parallel, and the reverse base 22 may be inclined upward or downward with respect to the forward base 21, and may include an acute angle therebetween. At the free end of the counter-body 22 there is mounted an arc ignition element 24 leading to the arc extinguishing chamber 4, which can contribute to the introduction into the arc extinguishing chamber 4 of the electric arc generated between the stationary contact 2 and the movable contact 3. The stationary contact 23 is arranged on the upper surface of the counter substrate 22 to contact the movable contact 33 of the movable contact 3.

The movable contacts 3 are also mounted to a base, which can be arranged rotatably with respect to the base above the counter-body 22 by means of a drive mechanism (not shown) and a transmission mechanism as will be described in detail below. The movable contact 3 is provided with a movable contact 33, and the movable contact 33 can be contacted with or separated from the fixed contact 23 through the rotation of the movable contact 3 relative to the base so as to realize the connection and disconnection of the circuit.

In order to accelerate the electric arc that produces between stationary contact 23 and movable contact 33 to get into explosion chamber 4, the utility model provides a magnetism increasing assembly 1, it can realize exerting the electromagnetic force in order to promote electric arc to get into explosion chamber 4 in the side of keeping away from explosion chamber 4 of electric arc when using the electric arc that produces as the boundary line to electric arc.

In particular, with combined reference to fig. 2-6, the magnetism-increasing assembly 1 is configured to include at least a first magnetism-increasing chamber 11 and a second magnetism-increasing chamber 12, both of which are made of a material that is not electrically and magnetically conductive (e.g., a thermoplastic or thermoset plastic). Referring particularly to fig. 3, the first and second magnetism increasing chambers 11 and 12 are disposed on both lateral sides of the opposing base 22 and are opposite to each other. In order to ensure that as large an ampere force as possible can be applied to the generated arc, it is required that at least a part of the arc falls into the space enclosed by the first and second magnetism increasing chambers 11 and 12. For this purpose, the first and second magnetization chambers 11, 12 should extend in the longitudinal direction of the counter substrate 22 at least over a part of the stationary contact 23, while the first and second magnetization chambers 11, 12 should extend in the vertical direction at least over the stationary contact 23, preferably vertically over the stationary contact, preferably covering as large as possible the moving contacts that are repelled from the stationary contact. When only the first and second magnetization chambers 11, 12 are present, both can be connected to the stationary contact 2, for example by means of additional fixing means.

The magnetism increasing assembly 1 further comprises a magnetic conductive material, such as a silicon steel sheet, which is filled into the cavities of the first magnetism increasing chamber 11 and the second magnetism increasing chamber 12. The magnetically conductive material may concentrate the surrounding magnetic field and apply it to the arc segment falling within the space enclosed by the first and second flux increasing chambers 11, 12. Wherein the magnetic conductive material can be placed in the cavities of the first and second magnetism increasing chambers 11 and 12, for example, in the form of grid plates (also called magnetism increasing plates), particles or blocks.

In order to further increase the magnetic field strength in the arc region, the field increasing assembly also preferably comprises a third field increasing chamber 13, also made of a material that is not electrically and magnetically conductive. The third magnetism increasing chamber 13 will be arranged vertically between the forward base 21 and the reverse base 22 and laterally of the reverse base 22 between the first magnetism increasing chamber 11 and the second magnetism increasing chamber 12 to connect both the first magnetism increasing chamber 11 and the second magnetism increasing chamber 12 to each other. Referring particularly to fig. 5, the outer contours of the first magnetization chamber 11, the second magnetization chamber 12 and the third magnetization chamber 13 may together form a U-shape. The third magnetizing chamber 13 will also be filled with magnetically conductive material. The cavities of the first, second and third magnetizing

chambers

11, 12, 13 are in communication with each other and constitute a U-shaped cavity, so that at least a part of the arc will be surrounded by the U-shaped cavity. The magnetic conductive material is preferably designed in the form of U-shaped magnetization sheets 15, for example, referring to fig. 4, a plurality of U-shaped magnetization sheets 15 can be accommodated in the U-shaped cavity in a form of superposition in the longitudinal direction of the reverse base 22.

It is also preferred that the magnetizing assembly 1 further comprises a support 14, see in particular fig. 3 and 5, also made of a material that is not electrically and magnetically conductive. The supporting portion 14 is designed to include a supporting body 141, and two lateral restraining protrusions 142 and a positioning boss 143 that extend upward and downward from the supporting body 141, respectively.

In particular, the support body 141 will also be arranged between the forward base 21 and the counter base 22, which serves to fill the vertical space between the forward base 21 and the counter base 22. The support body 141 extends from the third magnetization chamber 13 in the direction of the other longitudinal end of the main body 21 and extends up to the free end of the main body 22 or even beyond the free end of the main body 22. The support body 141 has its lower surface abutted to the upper surface of the forward base 21 in the vertical direction, and the upper surface of the support body 141 can also have the lower surface of the reverse base 22 abutted thereto.

When the movable contacts and the fixed contacts are connected or when the movable contacts 3 are repelled to cause an electric arc to exert a large force on the free end of the counter-base 22, it is extremely easy to cause deformation at the free end of the counter-base 22, for example to displace the counter-base 22 by a certain distance in the vertical direction towards the forward base 21. The support body 141 can support the counter base 22 from the vertical direction of the counter base 22, thereby preventing the free end of the counter base 22 from being displaced vertically downward.

The two lateral restraining projections 142 extend from the upper surface of the counter base 22. The transverse distance between the two transverse limit projections 142 is to be designed such that it allows receiving the counter base 22, in particular the free end of the counter base 22, therein, the transverse sides of the counter base 22 being able to abut against the two transverse limit projections 142, respectively, so that a displacement of the counter base 22 in the transverse direction is limited.

The first magnetization chamber 11, the second magnetization chamber 12, the third magnetization chamber 13, and the support portion 14 are preferably formed as a single piece. The positioning boss 143 extends from the lower surface of the support body 141. A positioning notch 25 (see fig. 1) is correspondingly formed on the upper surface of the forward base 21. The positioning notch 25 is positioned and dimensioned to allow the positioning boss 143 to be inserted therein, so as to limit the movement of the support portion 14 with respect to the stationary contact, and further limit the movement of the entire magnetizing assembly 1 with respect to the stationary contact 2.

In addition, for example, referring to fig. 2, the housings of the first, second and third magnetization increasing chambers far from the opposing base 22 may be partially open, and the U-shaped magnetization increasing sheets 15 may be exposed to the outside, so that the structure and the installation process may be simplified, in which case the U-shaped magnetization increasing sheets need to be wrapped with an insulating material such as an insulating tape from the outside of the housing to avoid direct contact with the fixed contacts. In addition, preferably, insulating paper 26 is laid between the magnetizing assembly 1 and the upper surface of the forward substrate 21 to further prevent the magnetizing sheet from directly contacting the static contact 2, so that the electrical gap of the product is increased. In addition, even under the condition that the U-shaped magnetism adding sheet 15 is not exposed outside the shell, the insulating paper 26 can be arranged to prevent static contacts below the arc extinguish chamber from being ablated by electric arc.

In addition, a part of the outer shell of one or more of the first magnetism increasing chamber 11, the second magnetism increasing chamber 12 and the third magnetism increasing chamber 13 can also be made of a gas generating material 16, such as nylon, and the like, and the example arrangement position thereof can be seen in fig. 5. It is also preferable that the entire outer shell of the first magnetism increasing chamber 11, the second magnetism increasing chamber 12 and the third magnetism increasing chamber 13 is made of a gas generating material. The gas-generating material 16 generates gas under the action of the electric arc, thereby blowing the electric arc to move towards the arc extinguishing chamber 4. In addition, the generated gas can effectively cool the electric arc, elongate the electric arc and increase the voltage of the electric arc, which is beneficial to the extinguishing of the electric arc.

The transmission mechanism is a mechanism designed to drive the movable contact 3 to rotate relative to the base under the drive of the drive mechanism, and has a function of clamping the repulsive movable contact 3. Specifically, referring to fig. 7-9, the transmission mechanism mainly includes a mounting base 5, a movable contact support 6, a spring 7, an upper spring shaft 8, a lower spring shaft 9, and a mounting screw 63.

Wherein the mounting base 5 comprises a fixed part 51 and an annular mounting 52, the fixed part 51 being fixedly connected to the base, in particular to a part of the base extending in a horizontal direction, the annular mounting 52 being designed to project from the fixed part 51 in the direction of the movable contact support 6 for the movable contact 3 and the movable contact support 6 to be connected thereto.

The movable contact support 6 mainly comprises a first support plate 61 and a second support plate 62, which extend parallel to each other and are arranged on either side of the annular mounting element 52. The movable contacts 3 will be arranged between the first leg plate 61 and the second leg plate 62. More specifically, when the movable contact 3 is designed to have two elements, i.e., the first movable contact element 31 and the second movable contact element 32, as shown in fig. 7, an end portion of the first movable contact element 31 away from the movable contact 33 will be clamped between the first support plate 61 and the annular mounting member 52, and an end portion of the second movable contact element 32 away from the movable contact 33 will be clamped between the second support plate 62 and the annular mounting member 52.

A movable contact rotating hole 34 is formed at an end of the movable contact 3 (the first movable contact element 31 and/or the second movable contact element 32) away from the movable contact 33, a first rotating hole 611 is formed in the first supporting plate 61, and a second rotating hole is formed in the second supporting plate 62. At this time, a mounting screw 63 is provided, and the movable contact rotation hole 34, the first rotation hole 611 and the second rotation hole may be connected together by means of the mounting screw 63 respectively passing therethrough, whereby the first holder plate 61, the second holder plate 62, the movable contact 3 and the ring-shaped mounting member 52 are rotatably connected to each other. In addition, in order to ensure, in particular, the electrical connectivity between the annular mounting element 52 and the movable contacts 3, the mounting screws 63 are locked to such an extent that the first supporting plate 61, the second supporting plate 62, the movable contacts 3 and the annular mounting element 52 are connected in abutment with each other. In the prior art, the movable contact 3 and the annular mounting part 52 are mostly connected by flexible connections, the flexible connections generate large resistance to the movement of the movable contact 3, and hard screws are adopted in the text, so that the technical effect of accelerating the opening speed of the movable contact 3 can be realized.

Referring particularly to fig. 9, the upper edge of the first brace panel 61 includes a first upper arcuate lower concave section 612 and a first upper arcuate upper convex section 613, wherein the first upper arcuate upper convex section 613 extends next to the first upper arcuate lower concave section 612. The upper edge of the second bracket plate 62 comprises a second upper arc shaped lower concave section 621 and a second upper arc shaped upper convex section 622, wherein the second upper arc shaped upper convex section 622 extends next to the second upper arc shaped lower concave section 621. The first bracket plate 61 includes a first lower circular arc lower concave section 614 at a lower edge thereof, and the first lower circular arc lower concave section 614 and the first upper circular arc upper convex section 613 are designed to have the same center, as schematically shown in fig. 10. While the lower edge of the second carrier plate 62 includes a second lower circular-arc lower concave section (not shown), the second lower circular-arc lower concave section and the second upper circular-arc upper convex section 622 are also designed to have the same center.

A long kidney hole 35 is formed in the movable contact 3 between the movable contact 33 and the movable contact rotation hole 34, and particularly, referring to fig. 8, the upper spring shaft 8 can pass through the long kidney hole 35 of the movable contact 3 and overlap both ends thereof on the first upper arc-shaped lower concave section 612 and the second upper arc-shaped lower concave section 621. The lower spring shaft 9 will be received in the first and second lower arc undercut

segments

614, 614 described above. The lower spring shaft 9 will be connected to the upper spring shaft 8 by means of the spring 7. When the movable contact 3 comprises a first movable contact element 31 and a second movable contact element 32, the spring 7 can be arranged between the first movable contact element 31 and the second movable contact element 32.

In the case of normal opening and closing, the upper spring shaft 8 will move within the first and second upper arcuate lower

concave sections

612 and 621. The first upper arc-shaped upper convex section 613 may be sized to allow the upper spring shaft 8 to disengage from the first upper arc-shaped lower concave section 612 and continue to move along the first upper arc-shaped upper convex section 613 as the movable contact 3 rotates relative to the movable contact support 6 under the action of the arc repulsion force. Likewise, the second upper rounded upper convex section 622 may be sized to allow the upper spring shaft 8 to disengage from the second upper rounded lower concave section 621 and continue to move along the second upper rounded upper convex section 622. In view of the fact that the lower spring shaft 9 is always located in the first lower circular arc lower concave section 614 and the second lower circular arc lower concave section and the first upper circular arc upper convex section 613 and the second upper circular arc upper convex section 622 have the same center as the first lower circular arc lower concave section 614 and the second lower circular arc lower concave section respectively, when the upper spring shaft 8 moves onto the first upper rounded upper convex section 613 and the second upper rounded upper convex section 622, the extension length of the spring 7 is kept constant during the movement of the upper spring shaft 8 along the first upper arc upper convex section 613 and the second upper arc upper convex section 622, the magnitude and direction of the force exerted by the spring 7 on the movable contact 3 (directed towards the axial center of the lower spring shaft 9) are thus kept constant during this phase, this achieves that the movable contact 3 cannot move in the reverse direction again into the first upper arc-shaped lower recess section 612 and the second upper arc-shaped lower recess section 621 under the drive of the spring 7.

In addition, the configuration of the first and

second brace plates

61 and 62 need not be identical, but at least the first and second upper arcuate lower

concave sections

612 and 621 should be symmetrically disposed about the ring mount 52, the first and second upper arcuate upper

convex sections

613 and 622 should be symmetrically disposed about the ring mount 52, and the first and second lower arcuate lower

concave sections

614 and 622 should be symmetrically disposed about the ring mount 52, with the symmetrical configuration enabling the upper and lower spring shafts to be balanced in force on the first and second brace plates, respectively.

In addition, it is preferable that bushings 10 are respectively sleeved on both ends of the upper spring shaft 8, and the upper spring shaft 8 moves along the first and second upper arc-shaped lower

concave sections

612 and 621 and the first and second upper arc-shaped upper

convex sections

613 and 622 by means of the bushings 10. In the case of providing the shaft sleeve 10, the diameter of the upper spring shaft can be designed to be smaller to save materials, and the movement of the upper spring shaft relative to the movable contact support can be made smoother. In addition, the bushing 10 can limit the displacement of the upper spring shaft 8 with respect to the movable contact, for example in the transverse direction, to prevent the upper spring shaft from coming out of the kidney-shaped hole of the movable contact during movement.

In addition, a first driving hole 615 and a second driving hole (not shown) are further respectively formed on the first supporting plate 61 and the second supporting plate 62, and a driving mechanism (not shown) can drive the movable contact support 6 to rotate relative to the mounting base 5 in a direction that the movable contact 3 is engaged with the fixed contact 2, for example, in a counterclockwise direction in fig. 9, by means of the first driving hole 615 and the second driving hole. At this time, the movable contact 3 and the movable contact support 6 synchronously rotate under the action of the spring 7.

The transmission mechanism realizes that the movable contact 3 can be clamped by the movable contact bracket after the movable contact 3 is repelled, thereby avoiding the fall-back of the movable contact 3 and preventing the electric arc from burning again.

In addition, the movable contact 3 may also have only one element, for example, only include the first movable contact element 31 or the second movable contact element 32, and the structures of other components do not need to be changed, and only one of the movable contact elements is directly omitted, for example, only the first movable contact element 31 located between the first support plate 61 and the annular mounting member 52 is retained or only the second movable contact element 32 located between the second support plate 62 and the annular mounting member 52 is retained.

Claims

1. A circuit breaker including a base extending at least partially in a horizontal direction, further comprising:

an arc chute (4) fixedly mounted to the base;

a static contact (2) comprising a forward base (21) extending in a longitudinal direction and fixedly connected to a horizontally extending region of the base below the arc extinguishing chamber (4), the static contact (2) further comprising a reverse base (22), the reverse base (22) extending upward from one longitudinal end of the forward base (21) and then extending in reverse to the forward base (21) until a free end thereof reaches one side of the arc extinguishing chamber (4), wherein a static contact (23) is provided on an upper surface of the reverse base (22), and an arc striking member (24) leading to the arc extinguishing chamber (4) is mounted at the free end of the reverse base (22);

a movable contact (3), said movable contact (3) comprising a movable contact (33) and being designed to be rotatably arranged with respect to said base above said counter-body (22) by means of a drive mechanism and a transmission mechanism to engage or disengage said stationary contact (23) by means of said movable contact (33);

characterized in that the circuit breaker further comprises a magnetism increasing assembly (1), the magnetism increasing assembly (1) comprising a first magnetism increasing chamber (11) and a second magnetism increasing chamber (12), both made of a material that is non-electrically and non-magnetically conductive, the first magnetism increasing chamber (11) and the second magnetism increasing chamber (12) being arranged opposite to each other on both lateral sides of the counter base (22), the first magnetism increasing chamber (11) and the second magnetism increasing chamber (12) extending in a longitudinal direction of the counter base (22) at least over a part of the stationary contact (23) and in a vertical direction at least over the stationary contact to allow at least a part of an electric arc generated between the stationary contact (23) and the movable contact (33) to fall into a space enclosed by the first magnetism increasing chamber (11) and the second magnetism increasing chamber (12), the magnetism increasing assembly further comprising a magnetically conductive material, the magnetic conductive material is filled into the cavities of the first magnetism increasing cavity (11) and the second magnetism increasing cavity (12).

2. The circuit breaker of claim 1, wherein the magnetizing assembly further comprises a third magnetizing chamber, the third magnetizing chamber is also made of a material that is not electrically and magnetically conductive, and the third magnetizing chamber is designed to be vertically arranged between the forward substrate and the reverse substrate and arranged between the first magnetizing chamber and the second magnetizing chamber along a transverse direction of the reverse substrate to connect the first magnetizing chamber and the second magnetizing chamber, wherein the cavities of the first magnetizing chamber, the second magnetizing chamber and the third magnetizing chamber are communicated with each other and jointly form a u-shaped cavity, and the magnetic conductive material is accommodated in the u-shaped cavity in a form of a u-shaped magnetizing sheet in a shape-fitting manner along a longitudinal superposition of the reverse substrate.

3. The circuit breaker according to claim 2, characterized in that said magnetizing assembly further comprises a support portion also made of a material that is not electrically and magnetically conductive, said support portion comprising a support body designed to extend from said third magnetizing chamber towards the longitudinal other end of said forward base until reaching or exceeding the free end of said reverse base, wherein said support body is vertically dimensioned to allow its lower surface to abut against the upper surface of said forward base and its upper surface for the lower surface of said reverse base to abut against.

4. The circuit breaker as claimed in claim 3, wherein the support portion further comprises two lateral restraining protrusions extending from an upper surface of the support body, a lateral dimension between the two lateral restraining protrusions being designed to allow at least the free end of the reverse base to be received therein to prevent lateral displacement of the free end of the reverse base, the support portion further comprising a positioning boss extending from a lower surface of the support body, and a positioning recess formed on an upper surface of the forward base, wherein the positioning recess is dimensioned to allow the positioning boss to be inserted therein to restrain the support portion from being displaced relative to the stationary contact.

5. The circuit breaker of claim 2, wherein at least a portion of an outer shell of one or more of the first, second, and third magnetism-increasing chambers is made of a gas-generating material.

6. The circuit breaker of claim 4, wherein the first, second, third and support portions are a unitary piece with an insulating paper disposed between the magnetizing assembly and the upper surface of the forward base.

7. The circuit breaker according to claim 1, wherein the transmission mechanism includes a mounting base, a movable contact holder, a spring, an upper spring shaft, a lower spring shaft, and a mounting screw, wherein the mounting base includes a fixed portion fixedly connected to the base and a ring-shaped mounting member protruding from the fixed portion toward the movable contact holder, the movable contact holder is configured to include a first holder plate and a second holder plate arranged on both sides of the ring-shaped mounting member and extending in parallel with each other, an end portion of the movable contact remote from its movable contact is arranged between the first holder plate and the ring-shaped mounting member and/or between the second holder plate and the ring-shaped mounting member, a movable contact rotation hole is provided at an end portion of the movable contact remote from its movable contact, a first rotation hole is provided on the first holder plate, a second rotation hole is provided on the second holder plate, the movable contact rotating hole, the first rotating hole and the second rotating hole are connected with the annular mounting piece in a relatively rotatable and mutually abutted mode through the mounting screw.

8. The circuit breaker according to claim 7, wherein an upper edge of said first cradle plate includes a first upper arc-shaped lower concave section and a first upper arc-shaped upper convex section extending next to said first upper arc-shaped lower concave section, a lower edge of said first cradle plate includes a first lower arc-shaped lower concave section, an upper edge of said second cradle plate includes a second upper arc-shaped lower concave section and a second upper arc-shaped upper convex section extending next to said second upper arc-shaped lower concave section, a lower edge of said second cradle plate includes a second lower arc-shaped lower concave section, a long waist hole is opened on said movable contact between said movable contact and said movable contact rotation hole, said upper spring shaft is designed to pass through said long waist hole and to overlap at both ends thereof above said first upper arc-shaped lower concave section and said second upper arc-shaped lower concave section, said lower spring shaft is designed to be accommodated in said first lower arc-shaped lower concave section edge and said second lower arc-shaped lower concave section, the lower spring shaft is connected with the upper spring shaft by means of the spring, wherein the first upper arc upper convex section and the second upper arc upper convex section are dimensioned to allow the upper spring shaft to be disengaged from the first upper arc lower concave section and the second upper arc lower concave section and continue to move along the first upper arc upper convex section and the second upper arc upper convex section when the movable contact rotates relative to the movable contact support, and the first upper arc upper convex section and the second upper arc upper convex section respectively have the same circle center as the first lower arc lower concave section and the second lower arc lower concave section.

9. The circuit breaker of claim 8, wherein said first upper arcuate lower concave section and said second upper arcuate lower concave section are symmetrically disposed about the ring mount, said first upper arcuate upper convex section and said second upper arcuate upper convex section are symmetrically disposed about the ring mount, and said first lower arcuate lower concave section and said second lower arcuate lower concave section are symmetrically disposed about the ring mount.

10. The circuit breaker according to claim 9, wherein the movable contact includes a first movable contact element and a second movable contact element, wherein an end of the first movable contact element away from the movable contact thereof is clamped between the first support plate and the annular mounting member, an end of the second movable contact element away from the movable contact thereof is clamped between the second support plate and the annular mounting member, the spring is disposed between the first movable contact element and the second movable contact element, two ends of the upper spring shaft are respectively sleeved with bushings, a first driving hole and a second driving hole are respectively formed in the first support plate and the second support plate, and the driving mechanism drives the movable contact support to rotate relative to the mounting base through the first driving hole and the second driving hole.