Contact systems and load-break switches

Abstract

A contact system and a load-break switch include a moving contact assembly and a stationary contact. The moving contact assembly comprises two moving contact pieces, several supporting washers, a moving contact bracket, a fixed washer, and a spring. The two moving contact pieces, several supporting washers, the fixed washer, and the spring are mounted within the moving contact bracket. The several supporting washers are positioned between the two moving contact pieces. The spring drives the fixed washer to secure the moving contact pieces. Both ends of the two moving contact pieces extend outside the moving contact bracket and are spaced apart for mating with the stationary contact. The load-break switch including this contact system is very convenient to assemble and can be easily adjusted to accommodate stationary contacts of varying thicknesses.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, in particular to a load circuit breaker switch, in particular to a contact system of a load circuit breaker switch with a strip-shaped housing. Background Art

[0002] The load-break switch, equipped with an energy storage isolating switch and a pluggable fuse group, is an important switch electrical appliance in the power distribution system. The user drives the operating mechanism through the handle to drive the moving contact and the static contact to cooperate to conduct and disconnect the circuit. The fuse group provides current protection.

[0003] Existing load-break switches, particularly those with a strip-shaped housing, have a complex assembly process for the movable contact assembly of their contact systems, hindering assembly efficiency. Furthermore, the mounting and securing of the movable contact assembly to the push plate is complex, making the movable contact assembly either difficult to secure or, if easier to install, unreliable and prone to falling. Furthermore, due to machining errors, the movable contact assembly and the stationary contact are difficult to adjust when there is a certain deviation. This results in high friction between the movable contact assembly and the stationary contact, affecting the rapid closing of the movable and stationary contacts and the product's service life.

[0004] Existing load-break switches, particularly those with a strip-shaped housing, are susceptible to arc damage at the primary contact points of the moving and static contacts of their contact systems due to the high currents they carry, shortening the product's service life. Furthermore, the thickness of the static contacts varies for products with different current specifications. This requires replacing the static contacts 30 and redesigning the corresponding switch housing structure, which is costly. Summary of the Invention

[0005] The object of the present invention is to overcome the defects of the prior art and provide a contact system and a load-break switch.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A contact system includes a moving contact assembly and a static contact, wherein the moving contact assembly includes two moving contact pieces, several supporting washers, a moving contact bracket, a fixed washers and a spring. The two moving contact pieces, several supporting washers, the fixed washers and the spring are installed in the moving contact bracket, the several supporting washers are located between the two moving contact pieces, and the spring drives the fixed washers to fix the moving contact pieces. Both ends of the two moving contact pieces extend outside the moving contact bracket and are arranged at intervals for cooperating with the static contact.

[0008] Preferably, the moving contact bracket includes two bracket side plates arranged opposite to each other, and a bracket connecting arm is connected between the opposite sides of the two bracket side plates, and the two side sides of the moving contact piece are respectively provided with a first positioning notch, the two side sides of the supporting gasket are respectively provided with a second positioning notch, and the two side sides of the fixed gasket are respectively provided with a third positioning notch. The moving contact piece, supporting gasket and fixed gasket are installed between the two bracket side plates, and are respectively positioned and coordinated with the bracket connecting arm through the first positioning notch, the second positioning notch and the third positioning notch, and the spring is installed between the fixed gasket and a bracket side plate.

[0009] Preferably, the spring is a compression spring, and two bracket connecting arms are provided between each of the opposite sides of the two bracket side plates of the moving contact bracket, and the two bracket connecting arms on each side of the bracket side plate are arranged at intervals. Two first positioning notches are provided on both side sides of the moving contact piece, two second positioning notches are provided on both side sides of the support gasket, and two third positioning notches are provided on both side sides of the fixed gasket, and the inner side edges of the bracket connecting arms are respectively embedded in the corresponding first positioning notch, second positioning notch and third positioning notch.

[0010] Preferably, the two ends of the two moving contact pieces of the moving contact assembly have arc-shaped protrusions on one side facing each other, and the static contact includes a static contact plate inserted between the arc-shaped protrusions of the two moving contact pieces, and the arc-shaped protrusions make the contact between the moving contact piece and the static contact plate linear.

[0011] Preferably, it also includes a push plate, which is provided with a moving contact assembly hole for installing the moving contact assembly. The moving contact assembly is installed in the moving contact assembly hole, and both ends of the two moving contact pieces extend out of both sides of the push plate. The moving contact assembly can move in the moving contact assembly hole in a direction perpendicular to the plane where the moving contact piece is located.

[0012] Preferably, both side edges of the fixing gasket are respectively protruded with fixing lugs, and corresponding limiting notches are provided on the side walls of the moving contact assembly hole. The fixing lugs cooperate with the limiting notches to enable the moving contact assembly to be installed on the push plate; the length of the moving contact bracket in the direction perpendicular to the plane where the moving contact piece is located is less than the length of the moving contact assembly hole, and the thickness of the fixing lug is less than the width of the limiting notch, so that the moving contact assembly can move in the moving contact assembly hole along the direction perpendicular to the plane where the moving contact piece is located.

[0013] Preferably, the moving contact bracket includes two bracket side plates arranged opposite to each other, a bracket connecting arm is connected between the opposite sides of the two bracket side plates, and a fourth positioning notch is provided on the outer side of the bracket connecting arm;

[0014] A limiting boss is provided on both side walls of the moving contact assembly hole, so that a first limiting groove and a second limiting groove are respectively formed between the two sides of the limiting boss and the side walls at both ends of the moving contact assembly hole, and the limiting boss is close to the second limiting groove. The side of the limiting boss is provided with the limiting notches that cooperate with the fixing lugs on the upper and lower sides, and the fourth positioning notch cooperates with the limiting boss, and the fixing lug cooperates with the limiting notch, so that the moving contact assembly is fixed in the moving contact assembly hole of the push plate, and the first limiting groove is used to limit and accommodate one bracket side plate, and the fixing gasket corresponds to the limiting notch, and the second limiting groove is used to accommodate the part of the fixing gasket to the other bracket side plate, and the spring is located between the fixing gasket and the other bracket side plate.

[0015] Preferably, the fourth positioning notch corresponds to the two moving contact pieces and several supporting gaskets and fixed gaskets, the length of the fourth positioning notch is greater than the sum of the thicknesses of the two moving contact pieces and several supporting gaskets and fixed gaskets, and the fixing lug can extend into the fourth positioning notch but does not protrude from the bracket connecting arm, that is, it does not protrude from the moving contact bracket.

[0016] Preferably, the static contact comprises a static contact plate inserted between the two moving contact pieces, and is characterized in that the side edge of the end portion of the static contact plate inserted between the two moving contact pieces is an oblique side edge.

[0017] Preferably, the oblique side is inserted between the two moving contact pieces from one side, and an extension line of the oblique side and an extension line of a side of the corresponding moving contact piece form an oblique angle α, and the oblique angle α is an acute angle.

[0018] Preferably, the static contact contact plate includes a right-angled trapezoidal piece portion, the right-angled trapezoidal piece portion includes a square area and a right-angled triangle area that contacts the two moving contact pieces when the circuit breaker is closed, and the hypotenuse of the right-angled triangle area forms the hypotenuse.

[0019] The present invention also provides a load-break switch comprising the contact system of the present invention.

[0020] Preferably, it also includes a switch housing and an operating mechanism, the moving contact assembly of the contact system is installed on a push plate, the push plate is connected to the operating mechanism and slides linearly with the switch housing, the operating mechanism drives the push plate to slide back and forth along the length direction of the switch housing, so that the moving contact assembly contacts and separates from the static contact; the two ends of the two moving contact pieces of the moving contact assembly extend out of both sides of the push plate and respectively cooperate with the two static contacts, and the two static contacts are fixed in the switch housing and located on one side of the moving contact assembly.

[0021] The contact system of the load-break switch of the present invention comprises a movable contact piece of a movable contact assembly, a plurality of supporting washers, another movable contact piece, a fixed washers and a spring installed in a movable contact bracket. The two movable contact pieces are separated by the supporting washers and fixed by the fixed washers and the springs. The assembly is very convenient and the adjustment is very easy to adapt to static contacts of different thicknesses.

[0022] Furthermore, the notches of the movable contact piece, support washer, and fixed washer are positioned and fitted with the bracket connecting arm, making overall assembly convenient and secure. The fixed washer also features a fixing lug to facilitate the installation and mating of the movable contact assembly with the movable contact mounting hole. In particular, the assembly structure of the movable contact assembly and the movable contact mounting hole allows for slight movement of the movable contact assembly within the movable contact mounting hole in a direction perpendicular to the plane of the movable contact piece, compensating for machining errors between the movable contact assembly and the stationary contact.

[0023] In addition, through the fourth positioning notch on the bracket connecting arm of the moving contact assembly, the fixing lug on the fixing gasket, the limiting boss of the moving contact assembly hole, and the cooperation of the first limiting groove, the second limiting groove and the limiting notch, the moving contact assembly can be quickly and conveniently assembled as a whole into the moving contact assembly hole, with high assembly efficiency and firmness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the contact system of the load circuit switch of the present invention;

[0025] Figure 2 It is a schematic diagram of the assembly of the moving contact assembly and the push plate of the present invention;

[0026] Figure 3 This is a schematic diagram of the assembly of the push plate and the switch housing of the present invention;

[0027] Figure 4 is an exploded view of the movable contact assembly of the present invention;

[0028] Figure 5 It is a schematic diagram of the assembly of the moving contact assembly of the present invention;

[0029] Figure 6 This is an exploded view of the assembly of the moving contact assembly and the push plate of the present invention;

[0030] Figure 7 This is a top view of the assembled moving contact assembly and push plate of the present invention;

[0031] Figure 8 This is a schematic diagram of the assembly of the moving contact assembly and the static contact of the present invention, where the moving contact assembly and the static contact are in the open state;

[0032] Figure 9 This is a schematic diagram of the movable contact assembly and the stationary contact of the present invention when they are about to be closed;

[0033] Figure 10 It is a schematic diagram of the movable contact assembly and the static contact of the present invention when they are closed;

[0034] Figure 11 This is a side view of the movable contact assembly and the stationary contact of the present invention when they are about to be closed, showing the matching relationship between the oblique side of the stationary contact and one side of the movable contact piece;

[0035] Figure 12 It is another embodiment of the static contact of the present invention, which has only one static contact plate 301. DETAILED DESCRIPTION

[0036] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the load circuit switch of the present invention. The load circuit switch of the present invention is not limited to the description of the following embodiments.

[0037] like Figure 1 As shown, the load circuit switch of this embodiment includes a switch housing 1, an operating mechanism 2 and at least one phase circuit arranged in the switch housing 1, wherein the phase circuit includes a contact system 3 and a fuse 4 connected in series, wherein the contact system 3 includes a movable contact assembly 31 and a static contact 30 used in conjunction with each other, a handle 20 is connected to the operating mechanism 2, and the operating mechanism 2 is connected to the movable contact assembly 31; by toggling the handle 20, the movable contact assembly 31 is driven to move back and forth by the operating mechanism, so that the movable contact assembly 31 contacts and separates with the static contact 30, thereby closing and disconnecting the circuit, and causing the fuse 4 to melt in the event of current overload or short circuit in the circuit, thereby achieving circuit protection.

[0038] The load circuit switch of this embodiment includes three phase circuits, each of which includes two sets of contact systems 3 and a fuse 4 connected in series between two adjacent sets of contact systems 3. Each set of contact systems 3 includes two stationary contacts 30 arranged at intervals and two movable contact assemblies 31 arranged side by side at intervals. Each stationary contact 30 includes two stationary contact plates 301 respectively mated with one end of the two movable contact assemblies 31 (see Figure 8 ), one end of the two moving contact assemblies 31 respectively cooperates with the two static contact contact plates 301 of one static contact 30, and the other end of the two moving contact assemblies 31 respectively cooperates with the static contact contact plates 301 of the other static contact 30.

[0039] It should be noted that, as needed, one or more phase circuits can be provided. Each phase circuit can also include more contact systems 3 to make the load-break switch suitable for interrupting higher currents and voltages. In this embodiment, two contact systems 3 are preferably provided for each phase circuit, with a fuse 4 connected in series between the two contact systems 3. In this embodiment, each contact system 3 includes two moving contact assemblies 31, one end of each of which mates with the two stationary contact plates 301 of a stationary contact 30. Obviously, each contact system 3 may include only one moving contact assembly 31, with each stationary contact 30 having only one stationary contact plate 301. The operating mechanism 2 can employ a stored-energy mechanism, where an energy storage spring is compressed in the early stages of the handle 20's swing. After the handle 20 passes the dead center, the stored-energy spring releases energy, driving the moving contact assembly 31 to rapidly close. Alternatively, the operating mechanism 2 can employ a four-bar linkage structure without stored energy.

[0040] like Figure 1-3 As shown, the switch housing 1 of this embodiment is elongated and strip-shaped. The three phase circuits are arranged sequentially along the length of the switch housing 1 in the middle portion thereof. The operating mechanism 2 is located at one end of the switch housing 1, and the outlet terminal is located at the other end. The handle 20 extends from the top side of the switch housing 1 corresponding to the operating mechanism 2. Along the height of the switch housing 1, the fuse 4 for each phase circuit is positioned near the top side of the switch housing 1 for easy installation and replacement. The contact system 3 for each phase circuit is positioned below the corresponding fuse 4. A conductive busbar electrically connected to the contact system 3 is positioned below the contact system 3, located on the bottom side of the switch housing 1.

[0041] The two groups of contact systems 3 of each phase circuit are arranged at intervals, and the two static contacts 30 of each group of contact systems 3 are arranged at intervals in the upper and lower directions along the height direction of the switch housing 1. The two ends of the corresponding moving contact assembly 31 are respectively matched with the two static contacts 30, and the arc extinguishing chamber 32 is arranged corresponding to the moving contact assembly 31 and the static contact 30; the two ends of the fuse 4 are respectively electrically connected to a static contact 30 located above the two groups of contact systems 3, and a static contact located below the two groups of contact systems 3 is respectively electrically connected to two conductive busbars, and the two conductive busbars are respectively used to connect the incoming conductor and the outgoing conductor.

[0042] like Figure 2-3 As shown, the load short-circuit switch also includes a push plate 5, the moving contact assembly 31 is installed on the push plate 5, the push plate 5 is connected to the operating mechanism 2, and is linearly slidably matched with the switch housing 1. The static contact 30 is installed in the switch housing 1. The operating mechanism 2 drives the push plate 5 to slide back and forth horizontally along the length direction of the switch housing 1, so that the moving contact assembly 31 contacts and separates with the static contact 30.

[0043] The push plate 5 described in this embodiment cooperates with the switch housing 1 through a first guide and limit structure. The first guide and limit structure includes a rolling device and a rolling track used in conjunction with each other. Through the cooperation of the rolling device and the rolling track, the movement friction of the push plate can be changed from planar friction to rolling friction, which greatly reduces the friction force during the movement of the push plate, speeds up the closing and opening speed, improves the contact performance and can increase the applicable voltage level.

[0044] like Figure 2 As shown, the rolling device includes a rolling bearing 51, and bearing mounting shafts 501 for mounting the rolling bearing 51 are provided on both sides of the push plate 5. Figure 3 As shown, the switch housing 1 further includes a rolling track 52 that cooperates with the rolling bearing 51. Figure 1 As shown, the first connecting shaft 52 connects the push plate 5 to the operating mechanism 2. In this embodiment, the push plate 5 is provided with a rolling device, and the switch housing 1 is provided with a rolling track. Alternatively, the switch housing 1 may be provided with a rolling device and the push plate 5 may be provided with a rolling track. Alternatively, as a modified embodiment, the first guide and limiting structure may be a cooperating slide rail and guideway.

[0045] like Figure 2 As shown, the push plate 5 includes multiple groups of movable contact assembly holes 53. Each group of movable contact assembly holes 53 includes two movable contact assembly holes 53 arranged side by side along the width of the push plate 5. The multiple groups of movable contact assembly holes 53 are sequentially spaced along the length of the push plate 5. In this embodiment, each phase circuit includes four movable contact assemblies 31. For a total of 12 movable contact assemblies 31 for a three-phase circuit, these assemblies are installed on the push plate 5 in groups of two and spaced along the length of the switch housing 1. The ends of the movable contact assemblies 31 extend from the sides of the push plate 5.

[0046] like Figure 4-5As shown, one improvement of the present invention lies in the improved design of the moving contact assembly 31. Each moving contact assembly 31 includes two moving contact pieces 311, several supporting washers 312, a moving contact bracket 313, a fixed washer 314, and a spring 315. The two moving contact pieces 311, the several supporting washers 312, the fixed washer 314, and the spring 315 are installed in the moving contact bracket 313. The several supporting washers 312 are located between the two moving contact pieces 311. The spring 315 drives the fixed washer 314 to fix the moving contact piece 311. Both ends of the two moving contact pieces 311 extend outside the moving contact bracket 313 and are spaced apart to mate with the static contact 30. In this embodiment, a moving contact piece 311, several supporting washers 312, another moving contact piece 311, a fixed washers 314 and a spring 315 are sequentially installed in the moving contact bracket 313. Both ends of the two moving contact pieces 311 extend outside the moving contact bracket 313 and are spaced apart for cooperating with the static contact 30. Several supporting washers 312 are arranged between the two moving contacts to control the gap between the two ends of the two moving contact pieces 311 and to cooperate with static contacts 30 of different thicknesses. The several supporting washers 312 can be one or more, and the thickness of the multiple supporting washers 312 can be consistent or inconsistent. The two moving contact pieces 311 of the moving contact assembly 31 of the present invention are separated by the supporting washers 312 and fixed by the fixed washers 314 and the spring 315. They are very convenient to assemble and very easy to adjust to accommodate static contacts 30 of different thicknesses. As another embodiment, a plurality of fixed gaskets 314 may be provided, or supporting gaskets 312 or other gaskets may be provided outside the two moving contact pieces 311 , which all fall within the protection scope of the present invention.

[0047] Preferably, in the movable contact assembly 31 of this embodiment, the movable contact bracket 313 includes two bracket side plates 3132 arranged opposite to each other, and a bracket connecting arm 3131 is connected between the opposite sides of the two bracket side plates 3132. The two sides of the movable contact piece 311 are respectively provided with a first positioning notch 3111, the two sides of the supporting gasket 312 are respectively provided with a second positioning notch 3121, and the two sides of the fixing gasket 314 are respectively provided with a third positioning notch 3141. The movable contact piece 311 and the supporting gasket 312 are respectively provided with a third positioning notch 3141. The movable contact piece 311, the supporting washer 312, the fixing washer 314 are installed between the two bracket side plates 3132, and are positioned and mounted with the bracket connecting arm 3131 through the first positioning notch 3111, the second positioning notch 3121, and the third positioning notch 3141. Finally, the spring 315 secures the movable contact piece 311, the supporting washer 312, the fixing washer 314, and the movable contact bracket 313 together to form a whole. The spring 315 is installed between the fixing washer 314 and one of the bracket side plates 3132, making the overall assembly of the movable contact assembly 31 convenient and secure. One end of the spring 315 rests on the fixing washer 314, and the other end rests on one of the bracket side plates 3132 and is sleeved on the inner boss 313b of the bracket side plate 3132, controlling the spring's movement and preventing it from falling off.

[0048] Preferably, the spring 315 is a compression spring, and two bracket connecting arms 3131 are provided between each of the opposite sides of the two bracket side plates 3132 of the moving contact bracket 313, with a total of four bracket connecting arms 3131. The two bracket connecting arms 3131 on each side of the bracket side plate 3132 are arranged at intervals, and two first positioning notches 3111 are provided on both side sides of the moving contact piece 311, two second positioning notches 3121 are provided on both side sides of the support gasket 312, and two third positioning notches 3141 are provided on both side sides of the fixed gasket 314. The inner sides of the bracket connecting arms 3131 are respectively embedded in the corresponding first positioning notches 3111, second positioning notches 3121 and third positioning notches 3141.

[0049] like Figure 2 As shown, the push plate 5 is provided with a moving contact assembly hole 53 for mounting the moving contact assembly 31. The moving contact assembly 31 is mounted in the moving contact assembly hole 53. Both ends of the two moving contact pieces 311 extend out of both sides of the push plate 5 and respectively cooperate with the two static contacts 30. The two static contacts 30 are fixed in the switch housing 1 on one side of the moving contact assembly 31. The static contact contact plates 301 of the two static contacts 30 are respectively opposite to the side edges of the two ends of the two moving contact pieces 311.

[0050] Another improvement of the present invention lies in the assembly structure of the moving contact assembly 31 and the moving contact assembly hole 53. The moving contact assembly 31 can move slightly in the moving contact assembly hole 53 in a direction perpendicular to the plane where the moving contact piece 311 is located, so that when the moving contact assembly 31 and the static contact 30 fail to achieve a completely centered matching effect due to processing errors, this error value can be compensated by the floating amount of the moving contact assembly 31 to ensure that each time the circuit is closed, the moving contact assembly 31 can cut into the static contact 30 to achieve reliable electrical contact.

[0051] like Figure 5-6 As shown, the fixed washer 314 is provided with protruding fixing lugs 3142 on both sides, and the side walls of the movable contact assembly hole 53 are provided with corresponding limiting notches 531. The fixing lugs 3142 cooperate with the limiting notches 531 to mount the movable contact assembly 31 on the push plate 5. The length of the movable contact bracket 313 in a direction perpendicular to the plane of the movable contact piece 311 is slightly shorter than the length of the movable contact assembly hole 53, and the thickness of the fixing lugs 3142 is slightly smaller than the width of the limiting notches 531. This allows the movable contact assembly 31 to move horizontally within the movable contact assembly hole 53 in a direction perpendicular to the plane of the movable contact piece 311.

[0052] As a preferred embodiment, Figure 5-7 As shown, a fourth positioning notch 3135 is provided on the outer side of the bracket connecting arm 3131 of the movable contact bracket 313, and the two side edges of the fixing gasket 314 are respectively protruded with fixing lugs 3142, and the two side walls of the movable contact assembly hole 53 are provided with limiting bosses 532, so that the two sides of the limiting boss 532 and the two end side walls of the movable contact assembly hole 53 form a first limiting groove 534 and a second limiting groove 533 respectively. The limiting boss 532 is provided with a fixing lug 3142 on the upper and lower sides on the side close to the second limiting groove 533. The fourth positioning notch 3135 cooperates with the limiting boss 532, and the fixing lug 3142 cooperates with the limiting notch 531, so that the moving contact assembly 31 is fixed in the moving contact assembly hole 53 of the push plate 5. The first limiting groove 534 is used to limit and accommodate a bracket side plate 3132, and the fixing gasket 314 corresponds to the limiting notch 531. The second limiting groove 533 is used to accommodate the part of the fixing gasket 314 to the other bracket side plate 3132, and the spring 315 is located between the fixing gasket 314 and the other bracket side plate 3132. During assembly, external force compresses the spring 315 to move the fixing gasket 314 to the position corresponding to the second limiting groove 533 so that the fixing lug 3142 passes through the second limiting groove 533, and the moving contact assembly 31 can be installed in the moving contact assembly hole 53. When the external force spring 315 is removed, the fixing gasket 314 is driven to move, and the fixing lug 3142 is moved to the limiting notch 531 to fix the moving contact assembly 31.

[0053] There is a gap between the two bracket side plates 3132 and the side walls at both ends of the moving contact assembly hole 53. The thickness of the fixing lug 3142 is slightly smaller than the width of the limiting notch 531, so that the moving contact assembly 31 can swing slightly in the contact assembly groove 53 to compensate for the processing errors of the moving contact assembly 31 and the static contact 30. The side walls at both ends of the moving contact assembly hole 53 and the limiting boss 532 limit the moving contact assembly 31.

[0054] Preferably, the fourth positioning notch 3135 corresponds to the two moving contact pieces 311, the plurality of support washers 312, and the fixing washers 314. The length of the fourth positioning notch 3135 is slightly greater than the combined thickness of the two moving contact pieces 311, the plurality of support washers 312, and the fixing washers 314. The fixing lug 3142 extends into the fourth positioning notch 3135 but does not protrude beyond the bracket connecting arm 3131, that is, does not protrude beyond the moving contact bracket 313. The moving contact assembly 31 of this embodiment is easily assembled with the moving contact assembly hole 53. The moving contact assembly can be quickly and conveniently assembled integrally into the moving contact assembly hole 53, resulting in efficient and secure assembly. Furthermore, the assembly compensates for machining errors between the moving contact assembly 31 and the stationary contact 30.

[0055] like Figure 8-11 As shown, another improvement of the present invention lies in the structural design of the static contact 30, wherein the static contact 30 includes a static contact plate 301 for inserting between two moving contact pieces 311, and the end side of the static contact plate 301 inserted between the two moving contact pieces 311 is an oblique side 3012, so that the end side of the static contact plate 301 does not contact the moving contact piece 311 at the same time during the closing process, but transitions to the main contact position where the static contact plate 301 and the moving contact piece 311 contact through the oblique side 3012, and does not separate from the moving contact piece 311 at the same time during the opening process, but is finally separated through the oblique side 3012, thereby effectively protecting the main contact position of the static and moving contacts.

[0056] See also Figure 9 During the closing process of the moving contact assembly 31, one side of the two ends of the two moving contact pieces 311 will first contact the upper part of the oblique side 3012, and then transition to the main part of the two ends of the moving contact piece 311 as the moving contact assembly 31 cuts into the static contact plate 301, such as the convex position of the arc 3112 (see Figure 10 ), during the opening process of the moving contact assembly 31, the main parts of the two ends of the moving contact piece 311 first leave the static contact contact plate 301, and one side of the two ends of the two moving contact pieces 311 finally leave the static contact contact plate 301, so as to achieve the purpose of the oblique side 3012 contacting first and then separating, and control the arc burning to be concentrated in the area of ​​first contacting and then separating, that is, the oblique side 3012 area, rather than the main contact position of the static contact plate 301 and the moving contact piece 311 after the closing is completed, thereby effectively protecting the main contact position of the moving and static contacts.

[0057] Preferably, see Figure 11 The oblique side 3012 is inserted between the two moving contact pieces 311 from one side of the two moving contact pieces 311, and the oblique side 3012 is inclined from top to bottom toward the side away from the moving contact assembly 31, so that the oblique side 3012 at the end of the static contact contact plate 301 and the corresponding side of the two moving contact pieces 311 of the moving contact assembly 31 form an oblique angle α, and the oblique angle α is an acute angle.

[0058] See also Figure 10-11 The static contact plate 301 includes a right-angled trapezoidal portion, which includes a square area and a right-angled triangle area that contacts the two moving contact plates 311 when the circuit is closed. The hypotenuse of the right-angled triangle area forms the hypotenuse 3012. The square area is the main contact position between the static contact plate 301 and the moving contact plate 311 after the circuit is closed. Furthermore, the end of the moving contact plate 311 is protruded on one side of the static contact plate 301, which is close to the side of the static contact plate 301. The arc-shaped lug 3113 can guide the static contact plate 301 to be inserted between the two moving contact plates 311, and can also serve as an area where arc burns are concentrated. The middle part of the inner end of the moving contact plate 311 that contacts the square area when the circuit is closed is the main contact position.

[0059] like Figure 8 In the specific embodiment shown, the static contact 30 includes a static contact terminal plate 303, a static contact connecting plate 302 and two static contact contact plates 301. One end of the static contact connecting plate 302 is bent and connected to the static contact terminal plate 303, and the other end is provided with two static contact contact plates 301 arranged side by side at intervals. The two static contact contact plates 301 respectively cooperate with one end of the two moving contact assemblies 31 and are inserted between the two moving contact pieces 311 of the two moving contact assemblies 31.

[0060] like Figure 9 As shown, when the product is closed, the two moving contact pieces 311 of each moving contact assembly 31 will cut into the static contact plate 30 of the static contact 30, and the thickness of the static contact plate 301 will be slightly larger than the minimum spacing between the two moving contact pieces 311. The moving contact piece 311 and the static contact plate 301 are then pressed together by the spring 315 to achieve reliable electrical contact. When the static contact 30 has two or more static contact plates 301, the current will be diverted after passing through the static contact 30, flowing into two or more static contact plates 301 and passing through the moving contact assembly 31. The current will then flow into another static contact 30. By diverting the current, the current borne by each static contact plate 301 is reduced, thereby reducing the loop resistance and effectively reducing power loss. Each static contact 30 of this embodiment is provided with two static contact plates 301. Of course, as Figure 12As shown, as needed, the static contact 30 may also be provided with only one static contact plate 301 , which cooperates with one end of a moving contact assembly 31 .

[0061] Preferably, Figure 8 As shown, the switch housing 1 is provided with a stationary contact mounting slot 1304 for securing the stationary contact 30. The stationary contact 30 is provided with a plurality of fixing bumps 304. The stationary contact 30 is mounted within the stationary contact mounting slot 1304 and secured therein. When the stationary contact 30 has varying thicknesses, the plurality of fixing bumps 304 can be used to accommodate the same stationary contact mounting slot 1304. For products with different current specifications, the thickness of the stationary contact 30 may vary. By adjusting the thickness of the fixing bumps 304, the sum of the thickness of the stationary contact 30 and the fixing bumps 304 for different current specifications can be made equal, allowing the same stationary contact mounting slot 1304 to be accommodated without redesigning the housing structure. Preferably, the plurality of fixing bumps 304 are provided on the stationary contact connecting plate 302.

[0062] Preferably, Figure 9 As shown, guide slopes 3011 are provided on both sides of the end of the static contact contact plate 301. When the moving contact assembly 31 fails to achieve the centering effect of the moving and static contacts due to processing errors, the two guide slopes 3011 can also be corrected to ensure that during each closing process, the two moving contact pieces 311 of the moving contact assembly 31 will cut into the static contact contact plate 301 of the static contact 30 to achieve electrical contact.

[0063] In addition, the two moving contact pieces 311 of the moving contact assembly 31 have arc-shaped protrusions 3112 on the opposite sides. This ensures that the moving contact piece 311 and the static contact plate 301 make line contact during the closing process, effectively reducing friction during the closing and opening process and accelerating the closing and opening speed. Furthermore, the arc-shaped protrusions 3112 facilitate the insertion of the end of the static contact plate 301. In this case, the line contact portion of the arc-shaped protrusions 3112 is the primary contact point between the moving contact piece 311 and the static contact plate 301 during closing. In this embodiment, the arc-shaped protrusions 3112 are formed by axially bending the moving contact piece 311. Preferably, the side protrusions of the arc-shaped protrusions 3112 extend to form arc-shaped lugs 3113. The arc-shaped lugs 3113 not only guide the static contact plate 301 when inserted between the two moving contact pieces 311, but also serve as an area where arc burns are concentrated.

[0064] Obviously, the static contact 30 of the present invention is not limited to the movable contact assembly 31 of this embodiment and can also be used in conjunction with movable contacts of other structures. For example, the two movable contact pieces 311 are flat and do not have the arc-shaped protrusions 3112. For example, the two movable contact pieces 311 can adopt other assembly structures, such as the assembly structure of the support washer 312, movable contact bracket 313, fixed washer 314, and spring 315 of this embodiment. Another example is a structure where the two movable contact pieces 311 are two elastic pieces bent to form the movable contact pieces 311.

[0065] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A contact system comprising a moving contact assembly (31) and a stationary contact (30), characterized in that: The moving contact assembly (31) comprises two moving contact pieces (311), a plurality of supporting washers (312), a moving contact bracket (313), a fixed washers (314) and a spring (315). The two moving contact pieces (311), the plurality of supporting washers (312), the fixed washers (314) and the spring (315) are installed in the moving contact bracket (313). The plurality of supporting washers (312) are located between the two moving contact pieces (311). The spring (315) drives the fixed washers (314) to fix the moving contact pieces (311). Both ends of the contact piece (311) extend out of the movable contact bracket (313) and are spaced apart for cooperating with the static contact (30); and a push plate (5) is also included, wherein the push plate (5) is provided with a movable contact assembly hole (53) for mounting the movable contact assembly (31), and the movable contact assembly (31) is mounted in the movable contact assembly hole (53). Both ends of the two movable contact pieces (311) extend out of both sides of the push plate (5), and the movable contact assembly (31) can move in the movable contact assembly hole (53) in a direction perpendicular to the plane where the movable contact piece (311) is located.

2. The contact system according to claim 1, wherein: The movable contact bracket (313) comprises two bracket side plates (3132) arranged opposite to each other, a bracket connecting arm (3131) is connected between the opposite sides of the two bracket side plates (3132), the two side sides of the movable contact piece (311) are respectively provided with a first positioning notch (3111), the two side sides of the supporting gasket (312) are respectively provided with a second positioning notch (3121), and the two side sides of the fixed gasket (314) are respectively provided with a third positioning notch (3141). The movable contact piece (311), the supporting gasket (312) and the fixed gasket (314) are installed between the two bracket side plates (3132) and are respectively positioned and fitted with the bracket connecting arm (3131) through the first positioning notch (3111), the second positioning notch (3121) and the third positioning notch (3141). The spring (315) is installed between the fixed gasket (314) and one bracket side plate (3132).

3. The contact system according to claim 2, characterized in that: The spring (315) is a compression spring. Two bracket connecting arms (3131) are respectively provided between each of the opposite sides of the two bracket side plates (3132) of the moving contact bracket (313). The two bracket connecting arms (3131) on each side of the bracket side plate (3132) are arranged at intervals. Two first positioning notches (3111) are respectively provided on the two side edges of the moving contact piece (311), two second positioning notches (3121) are respectively provided on the two side edges of the supporting gasket (312), and two third positioning notches (3141) are respectively provided on the two side edges of the fixing gasket (314). The inner side edges of the bracket connecting arms (3131) are respectively embedded in the corresponding first positioning notch (3111), second positioning notch (3121) and third positioning notch (3141).

4. The contact system according to claim 1, wherein: The two moving contact pieces (311) of the moving contact assembly (11) have arc-shaped protrusions (3112) on the opposite sides of the two ends. The static contact (30) includes a static contact plate (301) inserted between the arc-shaped protrusions (3112) of the two moving contact pieces (311). The arc-shaped protrusions (3112) enable the moving contact piece (311) and the static contact plate (301) to form a line contact.

5. The contact system according to claim 1, wherein: The two side edges of the fixed gasket (314) are respectively protruded with fixed lugs (3142), and the two side walls of the movable contact assembly hole (53) are correspondingly provided with limiting notches (531). The fixed lugs (3142) cooperate with the limiting notches (531) to enable the movable contact assembly (31) to be installed on the push plate (5); the length of the movable contact bracket (313) in a direction perpendicular to the plane where the movable contact piece (311) is located is shorter than the length of the movable contact assembly hole (53), and the thickness of the fixed lugs (3142) is smaller than the width of the limiting notch (531), so that the movable contact assembly (311) can move in the movable contact assembly hole (53) along a direction perpendicular to the plane where the movable contact piece (311) is located.

6. The contact system according to claim 5, characterized in that: The moving contact bracket (313) comprises two bracket side plates (3132) arranged opposite to each other, a bracket connecting arm (3131) is connected between the opposite sides of the two bracket side plates (3132), and a fourth positioning notch (3135) is provided on the outer side of the bracket connecting arm (3131); The side walls of the movable contact assembly hole (53) are provided with limiting bosses (532), so that a first limiting groove (534) and a second limiting groove (533) are respectively formed between the two sides of the limiting boss (532) and the side walls of the movable contact assembly hole (53). The limiting boss (532) is provided with the limiting notch (531) on the upper and lower sides on the side close to the second limiting groove (533) and is matched with the fixing lug (3142). The fourth positioning notch (3135) is matched with the limiting boss (532). The fixing lug The ear (3142) cooperates with the limiting notch (531) so that the moving contact assembly (31) is fixed in the moving contact assembly hole (53) of the push plate (5); the first limiting groove (534) is used to limit and accommodate one bracket side plate (3132); the fixed gasket (314) corresponds to the limiting notch (531); the second limiting groove (533) is used to accommodate the portion of the fixed gasket (314) to the other bracket side plate (3132); and the spring (315) is located between the fixed gasket (314) and the other bracket side plate (3132).

7. The contact system according to claim 6, characterized in that: The fourth positioning notch (3135) corresponds to the two moving contact pieces (311), the plurality of supporting pads (312) and the fixing pad (314); the length of the fourth positioning notch (3135) is greater than the sum of the thicknesses of the two moving contact pieces (311), the plurality of supporting pads (312) and the fixing pad (314); the fixing lug (3142) can extend into the fourth positioning notch (3135) but does not protrude from the bracket connecting arm (3131), that is, does not protrude from the moving contact bracket (313).

8. The contact system according to claim 1, wherein: The static contact (30) comprises a static contact plate (301) inserted between two moving contact pieces (311), and is characterized in that the end side edge of the static contact plate (301) inserted between the two moving contact pieces (311) is an oblique side edge (3012).

9. The contact system according to claim 8, characterized in that: The oblique side (3012) is inserted between the two moving contact pieces (311) from one side of the two moving contact pieces (311), and the extension line of the oblique side (3012) and the extension line of the side corresponding to the moving contact piece (311) form an oblique angle α, and the oblique angle α is an acute angle.

10. The contact system according to claim 8, characterized in that: The static contact plate (301) comprises a right-angled trapezoidal piece portion, the right-angled trapezoidal piece portion comprises a square area and a right-angled triangle area that are in contact with two moving contact pieces (311) when the switch is closed, and the hypotenuse of the right-angled triangle area forms the hypotenuse (3012).

11. A load-break switch, characterized in that: The contact system comprises any one of claims 1-10.

12. The load-break switch according to claim 11, wherein: The invention also includes a switch housing (1) and an operating mechanism (2); the movable contact assembly (31) of the contact system is mounted on a push plate (5); the push plate (5) is connected to the operating mechanism (2) and linearly slides with the switch housing (1); the operating mechanism (2) drives the push plate (5) to slide back and forth along the length direction of the switch housing (1), so that the movable contact assembly (31) and the static contact (30) are in contact and separated; the two movable contact pieces (311) of the movable contact assembly (31) extend from both sides of the push plate (5) to respectively cooperate with the two static contacts (30); the two static contacts (30) are fixed in the switch housing (1) and located on one side of the movable contact assembly (31).

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