Double-breakpoint circuit breaker

Abstract

A double-breakpoint circuit breaker comprises an operating handle, the operating handle drives a contact linkage seat to move up and down in a shell through an upper connecting rod driving mechanism assembly, and the contact linkage seat can drive a moving contact assembly on the corresponding side to rotate around an installation connecting shaft on the corresponding side in the up-down movement process in the shell. And the moving contact on the corresponding side can be in contact with and separated from the static contact on the corresponding side in the rotating process, so that the on-off of the circuit breaker is realized. The mechanism seat drives the double-breakpoint moving contact to rotate, and the moving contact is contacted with and separated from the double-breakpoint static contact in the rotating process, so that the purpose of double breakpoints is realized, the installation difficulty of a product is simplified, and the reliability and the stability of motion transmission are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and specifically relates to a double-breakpoint circuit breaker. Background Art

[0002] With the development of DC power systems such as photovoltaics, energy storage, rail transit, and data centers, the application of switches in DC systems has become more and more widespread. In the prior art, the circuit breakers originally used for AC systems cannot be used in DC systems, or can be used in DC systems after being improved, but the existing circuit breakers for DC systems cannot meet the requirements of fast disconnection in existing DC power systems. Even if there are some double-breakpoint circuit breakers that can be used in DC systems, they use a rotary structure, that is, two different moving contacts are installed on the same rotating shaft, and the rotating shaft is rotated to drive the moving contact to contact the static contact assembly during the rotation process, thereby achieving the purpose of double breakpoints. This type of rotary double-breakpoint circuit breaker is large in size, has a complex motion transmission structure, is difficult to assemble, has poor reliability, and is difficult to arrange more arc-extinguishing grids. The arc-extinguishing ability of the circuit breaker is limited, and the breaking ability is not strong. Utility Model Content

[0003] The purpose of the utility model is to provide a double-breakpoint circuit breaker for the above-mentioned circuit breaker used in the DC power system, which has the defects of complex motion transmission structure, difficult assembly, poor reliability, large product size and poor breaking performance. The double-breakpoint moving contact is driven to rotate by a mechanism seat, and the moving contact realizes contact and separation with the double-breakpoint static contact during the rotation process, thereby achieving the purpose of double breakpoints, simplifying the installation difficulty of the product, and improving the reliability and stability of motion transmission.

[0004] Technical Solution

[0005] In order to achieve the above technical purpose, the utility model provides a double-breakpoint circuit breaker, characterized in that it includes an operating handle, and the operating handle drives the contact linkage seat to move up and down in a shell through an upper connecting rod driving mechanism assembly. During the up and down movement of the contact linkage seat in the shell, the movable contact assembly on the corresponding side can drive the movable contact assembly on the corresponding side to rotate around the mounting connection shaft on the corresponding side. During the rotation of the movable contact on the corresponding side, it can contact and separate with the static contact on the corresponding side to realize the on and off of the circuit breaker.

[0006] In one of the embodiments, linkage shafts are provided on the left and right sides of the contact linkage seat, and a linkage arc hole is provided on one end side of the moving contact assembly on the corresponding side at a position corresponding to the linkage shaft, and the linkage shaft is located in the linkage arc hole, and the moving contact assembly on the corresponding side can be rotatably mounted on the mounting and connecting shaft on the corresponding side, and the mounting and connecting shaft on the corresponding side is fixedly mounted on the corresponding side of the shell.

[0007] In one embodiment, the moving contact assembly on the corresponding side includes a moving contact seat and a moving contact, and the moving contact seat and the moving contact on the corresponding side are integrated. A linkage arc hole is provided on one end side of the moving contact seat corresponding to the linkage shaft, and the connection between the moving contact seat and the moving contact can be rotatably mounted on the mounting connection shaft on the corresponding side.

[0008] In one of the embodiments, one end of the opening acceleration spring abuts against the upper end surface of the contact linkage seat, and the other end abuts against the housing.

[0009] In one embodiment, the lock buckle can release the lock of the trip buckle under the action of a thermal trip system or a magnetic trip system.

[0010] In one embodiment, the thermal trip system and the magnetic trip system are respectively arranged on the left and right sides of the shell, the magnetic trip system is located on the side close to the lock, and the thermal trip system is located on the side away from the lock. The thermal trip system includes a terminal, one end of the bimetallic strip is connected to the terminal, and the other end corresponds to the trip rod assembly.

[0011] In one of the embodiments, the trip rod assembly includes a rocker rod, one end of which is mounted on the shell, and the rocker rod can swing under the drive of the bimetal strip. One end of the trip rod is mounted on the rocker rod, and the other end is linked to the lock. A reset spring is connected to the rocker rod to provide it with a reset force. The trip rod can be limited by the limiting feature on the shell, and the position of the bimetal strip is adjustable.

[0012] In one embodiment, the mechanism assembly includes a mechanism seat, one end of the mechanism cantilever is connected to the mechanism seat, and the other end is connected to one end of the lower connecting rod, the other end of the lower connecting rod is mounted on the contact linkage seat, the mechanism seat is rotatably mounted in the inner cavity of the shell, the jump buckle is rotatably mounted on the mechanism seat, the lock buckle is rotatably mounted on the mechanism seat, the connecting torsion spring is mounted on the mechanism cantilever, one end of it abuts against a raised platform 1 on the mechanism seat, and the other end abuts against a raised platform 1 on the mechanism seat so that the mechanism cantilever moves with the mechanism seat, the reset torsion spring is mounted on the lock buckle, one end abuts against a raised platform 2 on the mechanism seat, and the other end abuts against a raised platform 2 on the lock buckle, one end of the upper connecting rod is pivotally connected to the operating handle, and the other end is pivotally connected to the driving hole on the jump buckle, a linkage arm extends from the lock buckle, and a linkage step corresponding to the linkage arm is provided on the jump buckle, and the mechanism seat is connected with a reaction spring for accelerating the opening speed.

[0013] In one of the embodiments, the arc generated by the separation of the movable contact on the corresponding side from the static contact on the corresponding side is extinguished by the arc extinguishing chamber on the corresponding side in the housing.

[0014] In one embodiment, the lower end of the static contact on the corresponding side is fixedly connected to one end of the arc-striking plate' on the corresponding side, and the other end of the arc-striking plate on the corresponding side extends to one side of the arc-extinguishing chamber on the corresponding side.

[0015] Beneficial Effects

[0016] The utility model provides a double-breakpoint circuit breaker, which includes an operating handle, wherein the operating handle drives a contact linkage seat to move up and down in a housing through an upper connecting rod driving mechanism assembly, and the contact linkage seat can drive the corresponding side of the moving contact assembly to rotate around the corresponding side of the installation connection shaft during the up and down movement in the housing, and the corresponding side of the moving contact can contact and separate with the corresponding side of the static contact during the rotation process, thereby realizing the on and off of the circuit breaker. The double-breakpoint moving contact is driven to rotate by the mechanism seat, and the moving contact realizes contact and separation with the double-breakpoint static contact during the rotation process, thereby realizing the purpose of double breakpoints, simplifying the installation difficulty of the product, and improving the reliability and stability of motion transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Attached Figure 1 It is a schematic diagram of the internal structure of the circuit breaker in the embodiment of the utility model.

[0019] Attached Figure 2 It is a structural schematic diagram of a circuit breaker in an open state in an embodiment of the utility model.

[0020] Attached Figure 3 It is a structural schematic diagram of a circuit breaker in a closed state in an embodiment of the utility model.

[0021] Attached Figure 4 It is a three-dimensional schematic diagram of the double-breakpoint moving contact system in the embodiment of the utility model. Figure 1 .

[0022] Attached Figure 5 It is a three-dimensional schematic diagram of the double-breakpoint moving contact system in the embodiment of the utility model. Figure 2 .

[0023] Attached Figure 6 This is a schematic diagram of the double breakpoint moving contact system in Example 1 of the utility model. Figure 1 .

[0024] Attached Figure 7 This is a schematic diagram of the double breakpoint moving contact system in Example 1 of the utility model. Figure 2 . DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0030] Example

[0031] The existing circuit breakers used in DC power systems have complex motion transmission structures, difficult assembly, poor reliability, large product size, and poor breaking performance. Figure 1 , 2 and 3, this embodiment provides a double-breakpoint circuit breaker, characterized in that: it includes an operating handle 1, the operating handle 1 drives the contact linkage seat 3 to move up and down in the housing 4 through the upper connecting rod 2 driving mechanism assembly a, the contact linkage seat 3 can drive the corresponding side of the moving contact assembly b to rotate around the corresponding side of the mounting connection shaft 9, 9' during the up and down movement in the housing 4, and the corresponding side of the moving contact 6, 6' can contact and separate with the corresponding side of the static contact 7, 7' during the rotation process to achieve the on and off of the circuit breaker. The arc generated by the separation of the moving contact 6, 6' on the corresponding side and the static contact 7, 7' on the corresponding side is extinguished by the arc extinguishing chamber 16, 16' on the corresponding side in the housing 4. The lower end of the static contact 7, 7' on the corresponding side is fixedly connected to one end of the arc-starting plate 17, 17' on the corresponding side, and the other end of the arc-starting plate 17, 17' on the corresponding side extends to one side of the arc extinguishing chamber 16, 16' on the corresponding side. In this embodiment, the static contact 7, 7' on the corresponding side is L-shaped, and a static silver point is installed on the side of the static contact 7, 7' on the corresponding side opposite to the moving contact 6, 6' on the corresponding side. The lower end of the static contact 7, 7' on the corresponding side is welded and fixedly connected to one end of the arc-starting plate 17, 17' on the corresponding side. The corresponding side generally refers to the left and right sides of the contact linkage seat 3.

[0032] Among them, as attached Figure 4 , 5, 6 and 7, the mechanism assembly a includes a mechanism seat a1, one end of a mechanism cantilever a2 is connected to the mechanism seat a1, and the other end is connected to one end of a lower connecting rod a3, the other end of the lower connecting rod a3 is mounted on the contact linkage seat 3, the mechanism seat a1 is rotatably mounted in the inner cavity of the shell 4, the jump buckle 14 is rotatably mounted on the mechanism seat a1, the lock buckle 11 is rotatably mounted on the mechanism seat a1, the connecting torsion spring a4 is mounted on the mechanism cantilever a2, one end of which is against the raised platform a101 on the mechanism seat a1, and the other end of which is against the raised platform a201 on the mechanism cantilever a2 so that the mechanism cantilever a2 moves with the mechanism seat a1, and the reset torsion spring a5 is mounted on the lock buckle 11, one end of which is against the raised platform a102 on the mechanism seat a1, and the other end of which is against the raised platform 1101 on the lock buckle 11. One end of the upper link 2 is pivotally connected to the operating handle 1, and the other end is pivotally connected to the driving hole 1401 on the jump buckle 14. The lock buckle 11 extends a linkage arm 1102, and the jump buckle 14 is provided with a linkage step 1402 corresponding to the linkage arm 1102. Figures 1 to 3As shown, during the rotation of the operating handle 1, the mechanism seat a1 can be driven to rotate through the upper connecting rod 2, the jumper 14 and the lock 11, and during the rotation of the mechanism seat a1, the contact linkage seat 3 can be driven to move up and down in the housing 4 through the lower connecting rod a3. When an overload current appears in the circuit, in order to realize the opening of the operating handle 1, the mechanism seat a1 is connected with a reaction spring 15, one end of the reaction spring 15 abuts against the inner cavity of the housing 4, and the other end abuts against the mechanism seat a1. That is, when the operating handle 1 is closed, the reaction spring 15 is compressed to store energy. When an overload current appears in the circuit and the operating handle 1 is about to change from the closed state to the open state, the reaction spring 15 is released to accelerate the rotation of the mechanism seat a1 to facilitate the opening.

[0033] Specifically, as shown in the attached Figure 2 and 3 As shown, linkage shafts 8, 8' are provided on the left and right sides of the contact linkage seat 3, and linkage arc holes 501, 501' are provided on one end side of the movable contact assembly b on the corresponding side at positions corresponding to the linkage shafts 8, 8', and the linkage shafts 8, 8' are located in the linkage arc holes 501, 501', and the movable contact assembly b on the corresponding side can be rotatably mounted on the mounting connection shafts 9, 9' on the corresponding side. The mounting connection shafts 9, 9' on the corresponding side are fixedly mounted on the corresponding side of the housing 4. To be more specific, the movable contact assembly b on the corresponding side includes a movable contact seat 5, 5' and a movable contact 6, 6'. The movable contact seat 5, 5' and the movable contact 6, 6' on the corresponding side are integrated. A linkage arc hole 501, 501' is provided on one end side of the movable contact seat 5, 5' corresponding to the linkage shaft 8, 8'. The connection between the movable contact seat 5, 5' and the movable contact 6, 6' can be rotatably mounted on the installation connection shaft 9, 9' on the corresponding side. In this embodiment, the movable contact seat 5, 5' and the movable contact 6, 6' on the corresponding side are hot-riveted into an integrated form.

[0034] As attached Figure 2 and 3 As shown, one end of the opening acceleration spring 10 abuts against the upper end surface of the contact linkage seat 3, and the other end abuts against the housing 4. When the contact linkage seat 3 moves up and down in the housing 4 driven by the mechanism cantilever a2, the linkage shafts 8, 8' provided on the left and right sides of the contact linkage seat 3 apply driving force to the corresponding linkage arc holes 501, 501', thereby driving the moving contact assembly b on the corresponding side to rotate around the mounting connection shafts 9, 9' on the corresponding side, and the moving contacts 6, 6' on the corresponding side can form snap-on contact with the static contacts 7, 7' on the corresponding side during the rotation process to connect the circuit breaker.

[0035] like Figure 2 and 3As shown, the lock buckle 11 can release the lock of the trip buckle 14 under the action of the thermal trip system 12 or the magnetic trip system 13. The thermal trip system 12 and the magnetic trip system 13 are respectively arranged on the left and right sides of the housing 4, the magnetic trip system 13 is located on the side close to the lock buckle 11, and the thermal trip system 12 is located on the side away from the lock buckle. The thermal trip system 12 includes a terminal 1201, one end of a bimetallic strip 1202 is connected to the terminal 1201, and the other end corresponds to a trip rod assembly 1203. The position of the bimetallic strip 1202 is adjusted by a screw 1204. The trip rod assembly 1203 includes a swing rod 1203a, one end of which is mounted on the housing 4, and the swing rod 1203a can swing under the drive of the bimetallic strip 1202. One end of the trip rod 1203b is mounted on the swing rod 1203a, and the other end is linked to the lock 11. The swing rod 1203a is connected with a reset spring 1203c to provide a reset force for it. Generally speaking, the reset spring 1203c is placed on the side of the swing rod 1203a facing the lock 11. The trip rod 1203b can be limited by a limit feature (not shown in the drawings) on the housing 4.

[0036] The present embodiment provides a double-breakpoint circuit breaker, in which the double-breakpoint moving contact is driven to rotate by the mechanism seat. The moving contact realizes contact and separation with the double-breakpoint static contact during the rotation process, thereby achieving the purpose of double breakpoints, simplifying the installation difficulty of the product, and improving the reliability and stability of motion transmission.

[0037] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A double breakpoint circuit breaker, characterized in that: The invention comprises an operating handle (1), wherein the operating handle (1) drives a contact linkage seat (3) to move up and down in a housing (4) via an upper connecting rod (2) driving mechanism assembly (a); during the up and down movement of the contact linkage seat (3) in the housing (4), the movable contact assembly (b) on the corresponding side can be driven to rotate around a mounting connection shaft (9, 9') on the corresponding side; during the rotation of the movable contact (6, 6') on the corresponding side, the movable contact (6, 6') on the corresponding side can contact and separate from the stationary contact (7, 7') on the corresponding side, thereby realizing the on and off of the circuit breaker.

2. A double breakpoint circuit breaker according to claim 1, characterized in that: The contact linkage seat (3) is provided with linkage shafts (8, 8') on both sides thereof, and a linkage arc hole (501, 501') is provided on one end side of the movable contact assembly (b) on the corresponding side at a position corresponding to the linkage shaft (8, 8'), the linkage shaft (8, 8') is located in the linkage arc hole (501, 501'), the movable contact assembly (b) on the corresponding side is rotatably mounted on the mounting connection shaft (9, 9') on the corresponding side, and the mounting connection shaft (9, 9') on the corresponding side is fixedly mounted on the corresponding side of the housing (4).

3. A double breakpoint circuit breaker as claimed in claim 2, characterized in that: The moving contact assembly (b) on the corresponding side comprises a moving contact seat (5, 5') and a moving contact (6, 6'); the moving contact seat (5, 5') and the moving contact (6, 6') on the corresponding side are integrated; a linkage arc hole (501, 501') is provided on one end side of the moving contact seat (5, 5') at a position corresponding to the linkage shaft (8, 8'); and a connection between the moving contact seat (5, 5') and the moving contact (6, 6') is rotatably mounted on the mounting connection shaft (9, 9') on the corresponding side.

4. A double breakpoint circuit breaker according to claim 1, characterized in that: One end of the opening acceleration spring (10) abuts against the upper end surface of the contact linkage seat (3), and the other end abuts against the housing (4).

5. A double breakpoint circuit breaker according to claim 1, characterized in that: The lock buckle (11) can release the lock of the trip buckle (14) under the action of the thermal tripping system (12) or the magnetic tripping system (13).

6. A double breakpoint circuit breaker as claimed in claim 5, characterized in that: The thermal tripping system (12) and the magnetic tripping system (13) are respectively arranged on the left and right sides of the housing (4); the magnetic tripping system (13) is located on the side close to the lock (11), and the thermal tripping system (12) is located on the side far from the lock (11).

7. A double breakpoint circuit breaker according to claim 6, characterized in that: The thermal tripping system (12) comprises a wiring terminal (1201); one end of a bimetallic strip (1202) is connected to the wiring terminal (1201), and the other end corresponds to a tripping rod assembly (1203); the tripping rod assembly (1203) comprises a swing rod (1203a); one end of the swing rod (1203a) is mounted on a housing (4); the swing rod (1203a) can swing under the drive of the bimetallic strip (1202); one end of a tripping rod (1203b) is mounted on the swing rod (1203a), and the other end is linked to a lock (11); a reset spring (1203c) is connected to the swing rod (1203a) to provide a reset force for the swing rod (1203a); the tripping rod (1203b) can be limited by a limit feature on the housing (4); and the position of the bimetallic strip (1202) is adjustable.

8. A double breakpoint circuit breaker according to claim 1, characterized in that: The mechanism assembly (a) comprises a mechanism seat (a1), one end of a mechanism cantilever (a2) is connected to the mechanism seat (a1), and the other end is connected to one end of a lower connecting rod (a3), the other end of the lower connecting rod (a3) ​​is mounted on a contact linkage seat (3), the mechanism seat (a1) is rotatably mounted in an inner cavity of a housing (4), a jump buckle (14) is rotatably mounted on the mechanism seat (a1), a lock buckle (11) is rotatably mounted on the mechanism seat (a1), a connecting torsion spring (a4) is mounted on the mechanism cantilever (a2), one end of the connecting torsion spring abuts against a raised platform (a101) on the mechanism seat (a1), and the other end of the connecting torsion spring abuts against a raised platform (a201) on the mechanism cantilever (a2). 1) The mechanism cantilever (a2) moves with the mechanism seat (a1), a reset torsion spring (a5) is installed on the lock buckle (11), one end of which abuts against the raised platform 2 (a102) on the mechanism seat (a1), and the other end abuts against the protrusion (1101) on the lock buckle (11), one end of the upper connecting rod (2) is pivotally connected to the operating handle (1), and the other end is pivotally connected to the driving hole (1401) on the jump buckle (14), a linkage arm (1102) extends from the lock buckle (11), and a linkage step (1402) corresponding to the linkage arm (1102) is provided on the jump buckle (14), and the mechanism seat (a1) is connected with a reaction spring (15) for accelerating the opening speed.

9. A double breakpoint circuit breaker according to claim 1, characterized in that: The electric arc generated by the separation of the movable contact (6, 6') on the corresponding side and the static contact (7, 7') on the corresponding side is extinguished by the arc extinguishing chamber (16, 16') on the corresponding side in the housing (4).

10. A double breakpoint circuit breaker according to claim 1, characterized in that: The lower end of the static contact (7, 7') on the corresponding side is fixedly connected to one end of the arc-striking plate (17, 17') on the corresponding side, and the other end of the arc-striking plate (17, 17') on the corresponding side extends to one side of the arc-extinguishing chamber (16, 16') on the corresponding side.

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