CN213340263U - Moving contact assembly and electrical switch - Google Patents

Abstract

The utility model relates to a moving contact subassembly and electrical switch, the moving contact subassembly includes: a moving contact support; the moving contact comprises a first end and an opposite second end, the first end is provided with a moving contact, and the moving contact is pivotally connected with the moving contact bracket around a second pivot axis between the first end and the second end; the load contact comprises an opening, the second end of the moving contact is accommodated in the opening and is in contact with the opening, and an elastic element is arranged between the load contact and the rack; in a closed position in which the movable contact is in electrical contact with the stationary contact of the electrical switch, the movable contact support pivots about the first pivot axis and the second end of the movable contact presses against the load contact such that the resilient member biases the load contact such that the load contact applies a moment to the movable contact to provide a contact pressure between the movable contact and the stationary contact.

Description

Moving contact assembly and electrical switch

Technical Field

The utility model relates to a moving contact subassembly for electric switch to and including this moving contact subassembly's electric switch.

Background

Some power switches, such as load switches and automatic transfer switches in low voltage electrical switches, require a certain short circuit current withstand capability, Icw. The Icw value is closely related to the performance of the power switch, i.e. the high performance switch has a high Icw indicating that it can remain closed when a short circuit current or an overcurrent flows, until a protective device (such as a circuit breaker) trips to break the short circuit current or the overcurrent.

The electrical switch comprises a moving contact component and a fixed contact, wherein the moving contact component is usually connected to a load end, the fixed contact is usually connected to a power supply, when the moving contact and the fixed contact of the moving contact component are closed, the electrical switch is conducted, and the load is connected into the power supply; when the moving contact of the moving contact component is disconnected with the fixed contact, the electrical switch is disconnected, and the load is disconnected from the power supply.

A dual power Transfer Switch (TSE) is a typical electrical switch, and is applied to occasions with heavy loads, and can realize that one power supply of two power supplies power for the loads, and when the power supply supplying power instantly fails, the loads are switched to the other power supply, so that the power failure time of the loads is reduced. The moving contact is the main component of the TSE, and the TSE can realize the power supply switching through the rotation of the moving contact. According to different structures of the TSE, the moving contact is mainly divided into a single-side contact and a double-side contact.

There is a need to provide a reliable movable contact assembly for an electrical switch and an electrical switch having excellent switching performance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reliable movable contact subassembly and electrical switch.

The utility model relates to a moving contact subassembly for electrical switch, but moving contact subassembly pivot ground sets up in electrical switch's frame, include: the movable contact support is provided with a first pivot axis and a second pivot axis which are parallel to each other, and the movable contact support pivots around the first pivot axis; the moving contact comprises a first end and an opposite second end, the first end is provided with a moving contact, and the moving contact is pivotally connected with the moving contact bracket around a second pivot axis between the first end and the second end; the load contact comprises an opening, the second end of the moving contact is accommodated in the opening and is in contact with the opening, and an elastic element is arranged between the load contact and the rack; in the closed position in which the movable contact is in electrical contact with the fixed contact of the electrical switch, the movable contact support pivots about the first pivot axis, and the second end of the movable contact presses against the load contact, so that the elastic member biases the load contact, and the load contact applies a moment to the movable contact to provide a contact pressure between the movable contact and the fixed contact.

In some examples, the load contact is pivotally connected to the movable contact support about a first pivot axis.

In some examples, in the initial disconnected position, a first connection line between the first pivot axis and the second pivot axis coincides with a second connection line between the second pivot axis and the second end.

In some examples, when the movable contact comes into contact with the stationary contact in the closed position, the second connection line is deflected by a first angle relative to the first connection line towards a side of the first connection line, providing a first contact pressure between the movable contact and the stationary contact; then the movable contact support continues to pivot, and the second connecting wire deflects towards the other side of the first connecting wire by a second angle relative to the first connecting wire to provide a second contact pressure between the movable contact and the fixed contact.

In some examples, the second contact pressure is greater than the first contact pressure.

In some examples, the first angle ranges from positive 2.5 degrees to positive 4 degrees and the second angle ranges from negative 2.5 degrees to negative 4 degrees.

In some examples, the first contact pressure ranges from 20N to 30N and the second contact pressure ranges from 25N to 35N.

In some examples, the load contact has a fan shape, two mounting grooves are symmetrically formed in a fan-shaped portion of the load contact, and the elastic member is a torsion spring, one portion of which is connected to the frame, and the other portion of which is connected to the two mounting grooves.

In some examples, the load contact is in the shape of a sector, and the resilient member is a torsion spring, one portion of which is connected to the frame and the other portion of which is connected to two radial sides of the sector.

In some examples, the load contact is in the shape of a sector, and the resilient member is two compression springs, each compression spring having one end connected to the frame and the other end connected to one radius side connected to the sector.

In some examples, the load contact is in the shape of a circular ring and is provided with a recess, and the elastic member is a torsion spring, one part of which is connected to the frame and the other part of which is connected to the recess.

In some examples, a contact location of the load contact with the second end is proximate to the first pivot axis.

In some examples, the load contact is in surface contact with the second end.

In some examples, the load contact is in the shape of a circular ring, the elastic member is a torsion spring, one part of the elastic member is connected to the frame, the other part of the elastic member is connected to the load contact, and the contact between the load contact and the second end is a bevel contact.

In some examples, the load contact is block-shaped and the contact of the load contact with the second end is a beveled contact.

In some examples, the movable contact support includes a guide rail, the load contact is slidably disposed in the guide rail, and the resilient member is received within the guide rail and disposed between the load contact and the movable contact support.

In some examples, the load contact and the second end contact location are formed as a ramp.

In some examples, a pressure compensation conductor is provided in electrical connection with the movable contact in the closed position.

In some examples, the load contacts are integrally formed.

In some examples, the load contact includes at least two separate pieces and is integrally connected by a connecting member.

In some examples, the load contact is electrically connected to the second end of the movable contact through a first flexible coupling.

In some examples, the first end of the movable contact includes two movable contacts disposed on either side of the first end.

The utility model also provides an electrical switch, including frame, static contact, load end and as before the movable contact subassembly, the load contact is connected with load end electricity through the soft hookup of second, the static contact is connected with the power electricity.

In some examples, the electrical switch is a dual power transfer switch, and includes a first stationary contact and a second stationary contact electrically connected to a first power source and a second power source, respectively, and the first end of the movable contact includes a first movable contact and a second movable contact configured to be electrically connected to the first stationary contact and the second stationary contact, respectively.

The utility model has the advantages of, because the load contact exerts moment in order to provide the contact pressure between moving contact and the static contact to the moving contact under the biasing of elastic component for the moving contact subassembly has good switching performance.

The utility model discloses a further advantage lies in, at the closure in-process, the moving contact support continues the pivot in order to provide bigger contact pressure for the moving contact subassembly has better switching performance, and has improved electrical switch's short-circuit current and has endured the ability.

The utility model has the other advantage that, for the open-close type contact between moving contact and the static contact, its wearing and tearing are little, and electric longe-lived.

The utility model has another advantage of simple structure and low manufacturing cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic diagram of a movable contact assembly in accordance with at least one embodiment of the present invention;

fig. 2 is a schematic view of the movable contact assembly shown in fig. 1 when just contacting the stationary contact;

fig. 3 is a schematic view of the moving contact assembly shown in fig. 1 fully contacting a stationary contact;

fig. 4 is a schematic diagram of a moving contact assembly moving toward a first stationary contact in accordance with at least one embodiment of the present disclosure;

fig. 5 is a schematic view of a moving contact assembly moving toward a second stationary contact in accordance with at least one embodiment of the present disclosure;

fig. 6 shows a moving contact assembly according to a first embodiment of the present invention;

fig. 7 shows a moving contact assembly according to a second embodiment of the present invention;

fig. 8 shows a moving contact assembly according to a third embodiment of the present invention;

fig. 9 shows a moving contact assembly according to a fourth embodiment of the present invention;

fig. 10 shows a moving contact assembly according to a fifth embodiment of the present invention;

fig. 11 shows a moving contact assembly according to a sixth embodiment of the present invention;

fig. 12 shows a moving contact assembly according to a seventh embodiment of the present invention;

fig. 13 shows a moving contact assembly according to an eighth embodiment of the present invention;

fig. 14 shows a moving contact assembly according to a ninth embodiment of the present invention;

fig. 15 shows a moving contact assembly according to a tenth embodiment of the present invention;

fig. 16 shows a moving contact assembly according to an eleventh embodiment of the present invention.

List of reference numerals

1 moving contact support

11 guide rail

2 first pivot axis

3 second pivot axis

4 moving contact

41 first end

42 second end

5,501,502,503,504,

505,506,507,508,509, load contact

510

511 connecting piece

51 opening

52 mounting groove

53,531,532 notch

6,601,602,603,604 elastic member

605,606,609

7 first connecting line

8 second connecting line

9 pressure compensating conductor

Alpha first angle

Beta second angle

M bias torque

100 moving contact assembly

S1 first static contact

S2 second fixed contact

P1 first moving contact

P2 second moving contact

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the embodiments of the present disclosure will be described in detail and completely with reference to the accompanying drawings of specific embodiments of the present disclosure. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are only some of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Preferred embodiments of the movable contact assembly according to the present disclosure will be described in detail below with reference to the accompanying drawings. Fig. 1 is a schematic diagram of a movable contact assembly according to at least one embodiment of the present disclosure. Fig. 2 is a schematic view of the movable contact assembly shown in fig. 1 just contacting the stationary contact. Fig. 3 is a schematic view of the moving contact assembly shown in fig. 1 fully contacting a stationary contact. Fig. 4 is a schematic diagram of a moving contact assembly moving toward a first stationary contact according to at least one embodiment of the present disclosure. Fig. 5 is a schematic diagram of a moving contact assembly moving toward a second stationary contact in accordance with at least one embodiment of the present disclosure.

It should be noted that the movable contact assembly according to the present disclosure may be used in an electrical switch, such as a dual power transfer switch, a circuit breaker, and the like, and the following description mainly takes the movable contact assembly used in the dual power transfer switch as an example. It will be readily apparent to those skilled in the art that modifications to the concepts of the present disclosure to adapt to different electrical switches, such as modifying the movable contacts of a double-sided contact to a single-sided contact, and corresponding other modifications, are also within the scope of the present disclosure.

A dual power transfer switch includes a movable contact assembly electrically connected to a load circuit, which movable contact assembly may have three positions switchable with respect to each other: the power supply device comprises a first power supply switch-on position in contact with a first power supply fixed contact, a second power supply switch-on position in contact with a second power supply fixed contact, and a double-division position which is not in contact with both the first power supply and the second power supply. The double split position is intermediate the first power position and the second power position. The electromagnetic driving mechanism of the dual-power transfer switch is used for driving the moving contact component to switch among the three positions so as to realize a specific electrical function.

Referring first to fig. 1, the movable contact assembly 100 for an electrical switch proposed by the present disclosure includes a movable contact support 1, a movable contact 4, a load contact 5 and an elastic member 6. The movable contact assembly 100 is pivotably disposed on a frame (not shown) of the electrical switch, and each of the movable contact support 1, the movable contact 4, the load contact 5, and the elastic member 6 is accommodated in a housing (not shown) of the electrical switch, or partially accommodated in the housing.

The movable contact support 1 has a first pivot axis 2 and a second pivot axis 3 which are parallel to each other, and the movable contact support 1 pivots around the first pivot axis 2. Namely, the movable contact support 1 is pivotally connected to the frame about a first pivot axis 2. The first pivot axis 2 and the second pivot axis 3 are respectively arranged at both ends along the longitudinal direction of the movable contact support 1. Alternatively, both the first pivot axis 2 and the second pivot axis 3 may be constituted by pins.

The movable contact 4 includes a first end 41 and a second end 42, and the first end 41 is opposite to the second end 42. The movable contact 4 is pivotally connected to the movable contact support 1 about the second pivot axis 3 between the first end 41 and the second end 42. In this embodiment, the movable contact 4 is a substantially flat rod-like structure that is pivotally connected to the movable contact support 1 about the second pivot axis 3. At the first end 41 of the movable contact 4, a movable contact is arranged, configured to be in electrical contact with a stationary contact. In other embodiments, the movable contact 4 may also have a curved rod-like structure or other shapes, and the present invention is not limited thereto. It should be noted that, in this document, the contact between the moving contact and the fixed contact refers to the contact between the moving contact and the fixed contact of the moving contact, and therefore, the two expressions refer to the same meaning.

The load contact 5 comprises an opening 51, the second end 42 of the movable contact 4 is accommodated in the opening 51 and is in contact with the opening 51, and an elastic member 6 is arranged between the load contact 5 and the frame. The load contact 5 interacts with the moving contact 4, so that the moving contact 4 can only rotate within a specified angle to realize the specified contact overtravel, namely, the pivoting angle of the moving contact 4 is limited within a certain range, and the moving contact is prevented from moving overtravel.

In a closed position in which the movable contact 4 is in electrical contact with the stationary contact, i.e. in a closed position in which the movable contact 4 is in electrical contact with the stationary contact of the electrical switch, the movable contact support 1 pivots about the first pivot axis 2, and the second end 42 of the movable contact 4 presses against the load contact 5, so that the elastic element 6 biases the load contact 5, and thus the load contact 5 applies a moment to the movable contact 4 to provide a contact pressure between the movable contact and the stationary contact.

As shown in fig. 1, in the present embodiment, the load contact 5 is pivotally connected to the movable contact support 1 about the first pivot axis 2. In the initial disconnected position, the first connection line 7 between the first pivot axis 2 and the second pivot axis 3 coincides with the second connection line 8 between the second pivot axis 3 and the second end 42. This arrangement is easy to understand because in the initial off position, for example, the double-split position of the dual power transfer switch, the pivot angle of the movable contact support 1 is 0, and the elastic member 6 does not generate an elastic force.

When the movable contact support 1 is driven to pivot towards the closed position (for example, the first power position), the second end 42 of the movable contact 4 starts to press against the load contact 5, in particular against the opening 51 of the load contact 5, so that the load contact 5 is deflected and the elastic element 6 is deformed, thereby exerting a biasing moment M on the load contact 5 returning to the initial open position. As shown in fig. 1, the movable contact support 1 rotates in a counterclockwise direction, and the biasing moment M is in a clockwise direction. And vice versa.

As shown in fig. 2, when the moving contact comes into contact with the fixed contact (in this embodiment, the first fixed contact S1) in the closed position, the second connection line 8 is deflected by a first angle α relative to the first connection line 7 toward one side of the first connection line 7, and the elastic member 6 applies a biasing moment M to the load contact 5, so that the load contact 5 applies a force F to the moving contact 4 at the contact point of the opening 51₁According to the moment principle, a first contact pressure F between the moving contact and the fixed contact S1 is provided₂. Alternatively, the moment applied to the movable contacts 4 ranges from 1.5N/m to 3N/m, preferably 2N/m.

As shown in fig. 3, as the movable contact support 1 continues to pivot, the second connection line 8 is deflected by a second angle β towards the other side of the first connection line 7 relative to the first connection line 7, providing a second contact pressure F 'between the movable contact and the stationary contact'₂. At this time, the load contact 5 applies a force F 'to the movable contact 4 at the contact point of the opening 51'₁. Here, in order to distinguish the directions of the angles, the right-side angle of the first connecting line 7 in fig. 2 and 3 is positive, and the left-side angle is negative.

Alternatively, the angle can also be defined as follows: the rotating direction of the second connecting wire 8 relative to the first connecting wire 7 is positive when the rotating direction of the movable contact support 1 is the same, and the rotating direction of the second connecting wire 8 relative to the first connecting wire 7 is negative when the rotating direction of the movable contact support 1 is opposite. For example, as shown in fig. 4, the movable contact support 1 rotates counterclockwise, and the second connection line 8 also rotates counterclockwise by an angle with respect to the first connection line 7, so that the angle is positive; as shown in fig. 5, the movable contact support 1 rotates clockwise, and the second connection line 8 also rotates clockwise relative to the first connection line 7 by an angle, and thus the angle is also positive.

It is easily conceived that, since the deflection angle of the load contact 5 is larger, the spring biasing force by the spring member 6 is also larger, and the second contact pressure F'₂Greater than the first contact pressure F₂。

Optionally, the first angle α ranges from positive 2.5 degrees to positive 4 degrees and the second angle β ranges from negative 2.5 degrees to negative 4 degrees. Preferably, the first angle α is positive 3.5 degrees and the second angle β is negative 3.5 degrees.

Optionally, the first contact pressure F₂Is in the range of from 20N to 30N, a second contact pressure F'₂In the range of 25N to 35N. Preferably, the first contact pressure F₂Is 25N, second contact pressure F'₂Is 30N.

Alternatively, the load contact 5 may be integrally formed. Fig. 16 shows a moving contact assembly according to an eleventh embodiment of the present invention. As shown in fig. 16, the load contact 5 may alternatively comprise at least two separate parts 510 and be connected in one piece by a connecting piece 511. And may be insulated from each other between the separation members 510. For example, fig. 16 shows a movable contact assembly for a dual power transfer switch that may include two separate members 510 for electrically contacting a first stationary contact S1 and a second stationary contact S2, respectively.

Alternatively, the first end 41 of the movable contact 4 includes two movable contacts, a first movable contact P1 and a second movable contact P2, respectively disposed on both sides of the first end 41.

Alternatively, the load contact 5 may be electrically connected to the second end 42 of the movable contact 4 by a first soft link. The load contact 5 may be electrically connected to the load end of the electrical switch by a second soft link. In the present invention, "the first soft coupling" and "the second soft coupling" refer to flexible electrical connection, which is a common electrical connection method in the art, such as copper braid, metal braided wire, flexible conductive strap, etc., but the disclosure is not limited thereto. The first soft link is used for carrying short-circuit current when the load contact 5 and the movable contact 4 are repelled during short circuit. The second soft coupling enables a flexible electrical coupling of the load contact 5 with the load end to carry the rated operating current of the electrical switch.

In summary, the load contact is arranged to provide the contact pressure between the moving contact and the fixed contact, so that the moving contact assembly has good switching performance. In addition, during the closing process, the movable contact support continues to pivot to provide larger contact pressure, so that the movable contact assembly has better switching performance, and the short-circuit current tolerance of the electric switch is improved.

The foregoing describes exemplary embodiments in accordance with the present disclosure. Further, according to the concept of the present disclosure, a plurality of modified embodiments of the movable contact assembly will be described in conjunction with fig. 6 to 14, which will be described below. Like parts are denoted by like reference numerals and will be described below mainly with respect to changes between the different embodiments.

Fig. 6 shows a movable contact assembly according to a first embodiment of the present invention. In this embodiment, the load contact 501 has a fan shape. The central angle of the fan shape may be between 90 and 180 degrees in size. Two symmetrically arranged mounting slots 52 are provided in the sector of the load contact 501 for mounting the spring 601. The elastic member 601 is a torsion spring, and has one portion connected to the frame and the other portion connected to the two mounting grooves 52.

Fig. 7 shows a moving contact assembly according to a second embodiment of the present invention. In this embodiment, the load contact 502 is also in the shape of a sector and the spring 602 is a torsion spring, a portion of which is attached to the housing. Unlike the first embodiment, the load contact 502 of this embodiment does not include a mounting groove, and another portion of the elastic member 602 is directly connected to two radius sides of the sector.

Fig. 8 shows a moving contact assembly according to a third embodiment of the present invention. In this embodiment, the load contact 503 is also in the shape of a sector, and the elastic member 603 is two compression springs, each of which has one end connected to the frame and the other end connected to one radius side connected to the sector.

Fig. 9 shows a movable contact assembly according to a fourth embodiment of the present invention. In this embodiment, the load contact 504 is annular in shape and is provided with a notch 53. The notches 53 may be symmetrically arranged on both sides of the circular ring, and the portion of the opening where the load contact 504 contacts the movable contact 4 is thickened to form a contact portion similar to a "faucet" shape. The elastic member 604 is a torsion spring, and has one portion connected to the frame and the other portion connected to the recess 53. The provision of the recess may facilitate assembly of the torsion spring.

Fig. 10 shows a moving contact assembly according to a fifth embodiment of the present invention. Similarly to the fourth embodiment, the load contact 505 of the fifth embodiment is also circular ring-shaped and is provided with a notch 531. In contrast, the contact position of the load contact 505 with the second end 42 is closer to the first pivot axis 2 than in the previous embodiment. This has the advantage that the load contact 505 can provide less pressure to the movable contact for the same contact pressure requirement (because the force arm is longer for the same moment), so that the load contact 505 can be dimensioned smaller.

Fig. 11 shows a movable contact assembly according to a sixth embodiment of the present invention. Similar to the fifth embodiment, the contact position of the load contact 506 with the second end 42 of the sixth embodiment is also close to the first pivot axis 2, the load contact 506 also being provided with a notch 532. Except that the load contact 506 is in surface contact with the second end 42.

Fig. 12 shows a movable contact assembly according to a seventh embodiment of the present invention. In this embodiment, the load contact 507 is also in the shape of a circular ring. The elastic member (not shown) is a torsion spring, and one portion is connected to the frame and the other portion is connected to the load contact 507. The load contact 507 makes a beveled contact with the second end 42. For example, the back of the second end 42 is provided with a tapered slot for making a beveled contact with the load contact 507. The surface contact provided by the sixth and seventh embodiments may provide better contact performance.

Fig. 13 shows a movable contact assembly according to an eighth embodiment of the present invention. In this embodiment, the load contacts 508 are block-shaped, and the load contacts 508 make a beveled contact with the second end 42. The spring applies a biasing force F towards the load contact 508 (fig. 13 is merely exemplary, and in practice the biasing force is applied in only one direction).

Fig. 14 shows a movable contact assembly according to a ninth embodiment of the present invention. In this embodiment, the movable contact support 1 includes a guide rail 11, and the load contact 509 is slidably disposed in the guide rail 11. For example, the rail 11 may be formed as a stepped hole, and the elastic member 609 is received in the stepped hole of the rail and is disposed between the load contact 509 and the movable contact support 1. Further, the contact position of the load contact 509 with the second end 42 is formed as a slope. The ninth embodiment differs from the previous embodiments in that the load contact 509 does not perform a pivoting movement but a sliding movement with respect to the movable contact support 1. The contact point of the movable contact 4 with the load contact 509 can move along the inclined plane.

Fig. 15 shows a moving contact assembly according to a tenth embodiment of the present invention. In this embodiment, a pressure compensation conductor 9 is provided in the closed position, which is electrically connected to the movable contact 4. The pressure compensation conductor 9 is arranged in parallel with the moving contact 4, and has the function of enabling the moving contact to obtain torque opposite to the torque for opening the contact between the moving contact and the fixed contact, so that the pressure of the contact is compensated, the short-circuit current tolerance of the electrical contact device is improved, and the required contact pressure is reduced.

It should be noted that the tenth embodiment shown in fig. 15 shows that a pressure compensation conductor 9 is further provided on the basis of the ninth embodiment, and the second end 42 of the movable contact 4 is shown to be in contact with a side inclined surface of the load contact 509 in the closed position, but the pressure compensation conductor 9 may also be combined with other embodiments, and the disclosure is not limited thereto.

Fig. 16 shows an eleventh embodiment according to the invention, which is provided with a separate load contact 510 and has been described before and will not be described in detail here.

The embodiment of the utility model provides an electric switch is still provided, including frame, static contact, load end and as above the movable contact subassembly, the load contact is connected with load end electricity through the soft hookup of second, and the static contact is connected with the power electricity.

For example, the electrical switch is a dual-power transfer switch, and includes a first fixed contact and a second fixed contact electrically connected to the first power supply and the second power supply, respectively, and a first end of the movable contact includes a first movable contact and a second movable contact configured to be electrically connected to the first fixed contact and the second fixed contact, respectively.

The above description is only for the specific embodiments of the present disclosure, but the scope of the embodiments of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes, substitutions or combinations within the technical scope of the embodiments of the present disclosure or under the concept of the embodiments of the present disclosure, and all of them should be covered by the scope of the embodiments of the present disclosure.

Claims (24)

1. A movable contact assembly for an electrical switch, the movable contact assembly being pivotally disposed on a frame of the electrical switch, the movable contact assembly comprising:

the movable contact support is provided with a first pivot axis and a second pivot axis which are parallel to each other, and the movable contact support pivots around the first pivot axis;

the moving contact comprises a first end and an opposite second end, the first end is provided with a moving contact, and the moving contact is pivotally connected with the moving contact bracket around a second pivot axis between the first end and the second end; and

the load contact comprises an opening, the second end of the movable contact is accommodated in the opening and is in contact with the opening, and an elastic element is arranged between the load contact and the rack;

in the closed position in which the movable contact is in electrical contact with the fixed contact of the electrical switch, the movable contact support pivots about the first pivot axis, and the second end of the movable contact presses against the load contact, so that the elastic member biases the load contact, and the load contact applies a moment to the movable contact to provide a contact pressure between the movable contact and the fixed contact.

2. A movable contact assembly as claimed in claim 1, wherein said load contact is pivotally connected to the movable contact support about a first pivot axis.

3. A movable contact assembly as claimed in claim 2, wherein in the initial disconnect position, a first line of connection between the first pivot axis and the second pivot axis coincides with a second line of connection between the second pivot axis and the second end.

4. A movable contact assembly as claimed in claim 3 wherein, when the movable contact is brought into contact with the stationary contact in the closed position, the second connecting line is deflected by a first angle relative to the first connecting line towards one side of the first connecting line to provide a first contact pressure between the movable contact and the stationary contact; then the movable contact support continues to pivot, and the second connecting wire deflects towards the other side of the first connecting wire by a second angle relative to the first connecting wire to provide a second contact pressure between the movable contact and the fixed contact.

5. The movable contact assembly of claim 4 wherein the second contact pressure is greater than the first contact pressure.

6. The movable contact assembly of claim 5 wherein the first angle ranges from plus 2.5 degrees to plus 4 degrees and the second angle ranges from minus 2.5 degrees to minus 4 degrees.

7. The movable contact assembly of claim 5 wherein the first contact pressure is in a range of 20N to 30N and the second contact pressure is in a range of 25N to 35N.

8. A movable contact assembly as claimed in claim 2, wherein the load contact is in the shape of a sector, two mounting slots are symmetrically disposed in a sector portion of the load contact, and the elastic member is a torsion spring, one portion of which is connected to the frame and the other portion of which is connected to the two mounting slots.

9. A movable contact assembly as claimed in claim 2, wherein said load contact is in the form of a sector and said resilient member is a torsion spring, one portion of which is connected to the frame and the other portion of which is connected to two radial sides of the sector.

10. A movable contact assembly as claimed in claim 2, wherein the load contact is in the shape of a sector, and the resilient member is two compression springs, each compression spring having one end connected to the frame and the other end connected to one radius side of the sector.

11. A movable contact assembly as claimed in claim 2, wherein said load contact is annular and is provided with a recess, and said resilient member is a torsion spring, one part of which is connected to the frame and the other part of which is connected to the recess.

12. A movable contact assembly as claimed in claim 11, wherein said load contact is positioned in contact with said second end proximate to said first pivot axis.

13. A movable contact assembly as claimed in claim 12, wherein said load contact is in surface contact with said second end.

14. A movable contact assembly as claimed in claim 2, wherein said load contact is in the shape of a circular ring, said resilient member is a torsion spring, one portion is connected to the frame, the other portion is connected to the load contact, and the contact between said load contact and said second end is a beveled contact.

15. A movable contact assembly as claimed in claim 2, wherein said load contact is block-shaped and said load contact is in beveled contact with said second end.

16. A movable contact assembly as claimed in claim 1, wherein the movable contact support includes a rail, the load contact is slidably disposed in the rail, and the resilient member is received in the rail and disposed between the load contact and the movable contact support.

17. The movable contact assembly of claim 16 wherein the load contact and the second end contact location are formed as a ramp.

18. A movable contact assembly according to any of claims 1-17, wherein a pressure compensation conductor is provided in electrical connection with the movable contact in the closed position.

19. A movable contact assembly according to any one of claims 1 to 17 wherein the load contacts are integrally formed.

20. A movable contact assembly according to any one of claims 1 to 17, wherein said load contact comprises at least two separate parts and is integrally connected by a connecting member.

21. A movable contact assembly according to any of claims 1 to 17 wherein the load contact is electrically connected to the second end of the movable contact by a first flexible coupling.

22. A movable contact assembly according to any one of claims 1 to 17 wherein the first end of the movable contact includes two movable contacts disposed on either side of the first end.

23. An electrical switch, characterized in that it comprises a frame, a fixed contact, a load terminal and a movable contact assembly as claimed in any one of claims 1 to 22, said load contact being electrically connected to the load terminal by means of a second soft link, said fixed contact being electrically connected to a power supply.

24. The electrical switch of claim 23, wherein the electrical switch is a dual power transfer switch comprising a first stationary contact and a second stationary contact electrically coupled to a first power source and a second power source, respectively, and wherein the first end of the movable contact comprises a first movable contact and a second movable contact configured to be electrically coupled to the first stationary contact and the second stationary contact, respectively.

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