Circuit breaker moving contact system and mechanism connection structure

Abstract

A circuit breaker moving contact system and mechanism connecting structure comprises a contact support and a connecting rod, and one end of the connecting rod extends into the inner side of the contact support from a notch on the contact support. One end of the connecting rod, which extends into the inner side of the contact support from a notch on the contact support, is rotatably mounted on the inner side of the contact support through a mounting shaft, and one end of the connecting rod, which is positioned on the outer side of the contact support, is connected with a mechanism crank arm through a shaft pin. According to the connecting structure, the connecting mode of a circuit breaker moving contact system and a mechanism is simplified, the assembly difficulty is reduced, neglected assembly of parts is avoided, and the parts are prevented from falling off in the using process.

Description

Technical Field

[0001] This invention belongs to the field of circuit breaker technology, specifically relating to a circuit breaker moving contact system and mechanism connection structure. Background Technology

[0002] Circuit breakers are an important part of electrical distribution equipment, mainly used in industrial low-voltage power systems. They are used to connect and disconnect current in the power grid circuit and protect lines and power equipment from faults such as overload, undervoltage, short circuit, and single-phase grounding. Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their application range. Low-voltage circuit breakers, also known as automatic switches or commonly referred to as "air switches," are electrical devices that combine manual switching functions with automatic protection against undervoltage, overload, and short circuit. They can be used to distribute electrical energy, infrequently start asynchronous motors, and protect power lines and motors. When serious overload, short circuit, or undervoltage faults occur, they can automatically disconnect the circuit. Their function is equivalent to a combination of a fuse switch and over / undervoltage relays, and generally, no parts need to be replaced after interrupting the fault current. They have gained widespread application.

[0003] As users increasingly demand higher safety assurance from universal circuit breakers, the power supply safety of circuit breakers is receiving more and more attention. The reliability of the moving contact, as the conductive part of the main circuit of the circuit breaker, directly affects the overall safety performance of the circuit breaker. However, the existing connection method between the operating mechanism and the contact mechanism of universal circuit breakers lacks reliable limiting function. The existing limiting method is not only structurally complex but also has a cumbersome assembly process. After repeated opening and closing of the circuit breaker, fatigue easily occurs, causing the moving contact to lose its kinetic energy. Under the action of electric repulsion, it separates from the stationary contact, resulting in the main circuit not being energized after a phase loss and subsequent closing. Furthermore, the lack of pull-back force on the moving contact can easily lead to insufficient opening distance between it and the stationary contact, generating a large amount of electric arc after energization, which can easily burn out the main circuit and cause safety accidents.

[0004] Chinese patent CN206516592U discloses a contact structure for a universal circuit breaker, which includes a contact mechanism, an energy storage mechanism, and a rotating shaft assembly connecting the contact mechanism and the energy storage mechanism. The energy storage mechanism drives the contact mechanism to close the circuit through the rotating shaft assembly. The rotating shaft assembly includes a rotating shaft that cooperates with the energy storage mechanism and a cantilever mounted on the rotating shaft. The contact mechanism includes a contact support and a moving contact mounted in the contact support. The contact support is connected to the cantilever via a connecting rod. The contact support has a connecting hole through which the connecting rod can pass. The connecting rod includes a connecting part that extends out of the connecting hole and is pivotally connected to the cantilever via a pin. The connecting part and the cantilever are respectively provided with shaft holes that cooperate with the pin. The contact support has limiting blocks on both sides of the connecting hole to limit the two ends of the pin. By setting the limiting blocks on the contact support to limit the pin, the connecting rod can also be limited, making the limiting effect more reliable. Moreover, the structure is simple, strong, and simplifies the assembly process. However, in this contact structure, the connection between the connecting rod and the contact support relies on the lever and lever spring for limiting. The lever is prone to breakage, and the entire mechanism has a high probability of failure. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing universal circuit breaker moving contact systems and mechanisms, such as the tendency for the lever to break and the resulting structural failure. This invention provides a new circuit breaker moving contact system and mechanism connection structure that eliminates the lever, simplifies the connection structure, and reduces assembly difficulty.

[0006] Technical solution

[0007] To achieve the above technical objectives, the present invention provides a circuit breaker moving contact system and a mechanism connection structure, which includes a contact support and a connecting rod. One end of the connecting rod extends into the inner side of the contact support through a slot on the contact support. The end of the connecting rod extending into the inner side of the contact support through the slot on the contact support is rotatably mounted on the inner side of the contact support via a mounting shaft. The end of the connecting rod located on the outer side of the contact support is connected to a mechanism crank arm via a pin. A limiting boss is provided on at least one side of the connecting rod on the outer side of the contact support. A shaft hole is arranged at the end of the connecting rod located on the outer side of the contact support. A pin passes through the shaft hole and a hole on the mechanism crank arm to connect the connecting rod to the mechanism crank arm.

[0008] When the mechanism and moving contact system are installed in the circuit breaker base, the projections of the pin and the limiting boss on the contact support onto the plane containing the radial direction of the shaft hole at least partially overlap during the movement of the mechanism and moving contact system.

[0009] When the operating mechanism is not installed on the circuit breaker base and the moving contact system is installed in the circuit breaker base, the projections of the shaft hole on the connecting rod and the limiting boss on the contact support onto the plane where the shaft hole is located will not overlap at least once during the movement of the mechanism and the moving contact system.

[0010] In one embodiment, limit bosses are provided on the outer surface of the contact support on both sides of the connecting rod.

[0011] In one embodiment, the diameter of the pin is smaller than the diameter of the bore.

[0012] In one embodiment, a limiting boss is provided on the outer surface of the contact support on either side of the connecting rod.

[0013] In one embodiment, the two ends of the mounting shaft are mounted on the connecting holes inside the contact support.

[0014] In one embodiment, the circuit breaker base is provided with a clearance groove to avoid the rotational travel of the connecting rod about the mounting shaft.

[0015] In one embodiment, a tight-fitting portion is provided on the inner side of the contact support to limit the rotational stroke of the connecting rod.

[0016] In one embodiment, the fitting portion is a slot on the inner side of the contact support corresponding to the position of the connecting rod.

[0017] In one embodiment, the end of the connecting rod connected to the mechanism crank arm is a U-shaped structure, the mechanism crank arm is located between the two side walls of the U-shaped structure, and the shaft hole is located on the two side walls;

[0018] Alternatively, one end of the mechanism crank arm connected to the connecting rod is a U-shaped structure, with the connecting rod located between the two side walls of the U-shaped structure.

[0019] In one embodiment, the end of the connecting rod connected to the mechanism crank arm is a U-shaped structure, the mechanism crank arm is located between the two side walls of the U-shaped structure, and the shaft hole is located on the two side walls;

[0020] Alternatively, one end of the mechanism crank arm connected to the connecting rod is a U-shaped structure, with the connecting rod located between the two side walls of the U-shaped structure.

[0021] In one embodiment, a foolproof structure is provided on the outer side wall of the two side walls of the U-shaped structure away from the limiting boss to ensure that the pin will not come out from the shaft hole on the outer side wall of the two side walls of the U-shaped structure away from the limiting boss.

[0022] In one embodiment, the foolproof structure is a bent or welded structure on the side wall of the U-shaped structure away from the limiting boss.

[0023] In one embodiment, the diameter of the pin is smaller than the diameter of the bore, and the foolproof structure at least partially overlaps with the projection of the bore on the connecting rod onto the plane in which the bore is radially located;

[0024] Alternatively, one end of the pin is provided with a boss, the diameter of which is larger than the diameter of the shaft hole. The boss is located between the side wall of the U-shaped structure that is closer to the limiting boss and the limiting boss, and the projection of the anti-foolproof structure and the boss onto the plane in which the shaft hole is located at least partially overlaps.

[0025] Beneficial effects

[0026] This invention provides a circuit breaker moving contact system and mechanism connection structure, comprising a contact support and a connecting rod. One end of the connecting rod extends into the inner side of the contact support through a slot. The other end of the connecting rod extending into the inner side of the contact support is rotatably mounted on the inner side of the contact support via a mounting shaft. The other end of the connecting rod located on the outer side of the contact support is connected to a mechanism crank arm via a pin. This connection structure simplifies the connection method of the circuit breaker moving contact system and mechanism, reduces assembly difficulty, avoids missing parts, and prevents components from falling off during use. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Appendix Figure 1 This is a schematic diagram of the connection structure between the moving contact system and the mechanism in Embodiment 1 of the present invention;

[0029] Appendix Figure 2 This is a schematic diagram of the connecting rod being installed inside the contact support in Embodiment 1 of the present invention;

[0030] Appendix Figure 3 This is a schematic diagram of the connecting rod installation in Embodiment 1 of the present invention. Figure 1 ;

[0031] Appendix Figure 4 This is a schematic diagram of the crank arm installation in Embodiment 1 of the present invention;

[0032] Appendix Figure 5 This is a schematic diagram of the connection between the connecting rod and the crank arm of the mechanism in Embodiment 1 of the present invention;

[0033] Figure 6 is a schematic diagram of the position of the clearance groove in Embodiment 1 of the present invention;

[0034] Appendix Figure 7 This is a schematic diagram of the location of the static assembly part in Embodiment 1 of the present invention; Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0040] Example

[0041] In existing technologies, the connection between the connecting rod and the contact support in the contact structure relies on a lever and a lever spring for limiting the movement. The lever is prone to breakage, leading to a high probability of failure for the entire mechanism. To address this problem, this embodiment provides a circuit breaker moving contact system and mechanism connection structure, as shown in the attached figure. Figure 1 As shown, it includes a contact support 1 and a connecting rod 2. One end of the connecting rod 2 extends into the inside of the contact support 1 through a slot 101 on the contact support 1, as shown in the attached figure. Figure 2 and 3 As shown, the connecting rod 2 extends from the slot 101 on the contact support 1 into the inner side of the contact support 1 at one end, and is rotatably mounted on the inner side of the contact support 1 via the mounting shaft 3, as shown in the attached figure. Figure 4 As shown, the end of the connecting rod 2 located outside the contact support 1 is connected to the mechanism crank arm 5 via a pivot pin 4.

[0042] In detail, the connecting rod 2 has a shaft hole 201 at one end located outside the contact support 1. The pin 4 passes through the shaft hole 201 and a hole on the mechanism crank arm 5 to connect the connecting rod 2 to the mechanism crank arm 5. The end of the connecting rod 2 connected to the mechanism crank arm 5 has a U-shaped structure, and the mechanism crank arm 5 is located between the two inner side walls of the U-shaped structure. The shaft hole 201 is located on the two side walls. Alternatively, the end of the mechanism crank arm 5 connected to the connecting rod 2 can also have a U-shaped structure, with the connecting rod 2 located between the two side walls of the U-shaped structure.

[0043] A limiting boss 102 is provided on at least one side of the connecting rod 2 on the outer surface of the contact support 1; in this embodiment, a limiting boss 102 is provided on either side of the connecting rod 2 on the outer surface of the contact support 1. A foolproof structure 202 is provided on the outer wall of the two outer walls of the U-shaped structure away from the limiting boss 102 to ensure that the pin 4 will not come out from the shaft hole 201 on the outer wall of the two outer walls of the U-shaped structure away from the limiting boss 102.

[0044] In this embodiment, the foolproof structure 202 is a bend on the side wall of the two outer side walls of the U-shaped structure that is away from the limiting boss 102. In order to ensure that the pin 4 can be smoothly installed into the shaft hole 201 without falling off, the diameter of the pin 4 is smaller than the diameter of the shaft hole 201, and the bend at least partially overlaps with the projection of the shaft hole 201 on the connecting rod 2 onto the plane where the shaft hole 201 is located radially.

[0045] Or as attached Figure 4 and attached Figure 5As shown, one end of the pin 4 is provided with a boss. The diameter of the boss is larger than the diameter of the shaft hole 201. The boss is located between the side wall of the U-shaped structure near the limiting boss 102 and the limiting boss 102. The bend and the projection of the boss on the radial plane of the shaft hole 201 at least partially overlap. The purpose is that when the pin 4 is to be installed, because there is a bend on the side wall of the connecting rod 2 away from the limiting boss 102, the head of the pin 4 (i.e. the end with the boss) will interfere with the bend. Therefore, the pin 4 can only be installed into the shaft hole 201 from the side of the shaft hole 201 located on the limiting boss 102 after the connecting rod 2 rotates around the mounting shaft 3 until it is completely offset from the limiting boss 102.

[0046] In this embodiment, when the end of the mechanism crank arm 5 connected to the connecting rod 2 is a U-shaped structure and the connecting rod 2 is located between the two side walls of the U-shaped structure, the foolproof structure 202 can also be a welded structure on the side wall of the two outer side walls of the U-shaped structure that is away from the limiting boss 102, that is, there is no need to bend, that is, the boss can be directly welded on the side wall.

[0047] Specifically, when the operating mechanism is not installed on the circuit breaker base a, and the moving contact system is installed in the circuit breaker base a, at least one position of the projection of the shaft hole 201 on the connecting rod 2 and the limiting boss 102 on the contact support 1 onto the radial plane of the shaft hole 201 should not overlap during the movement of the mechanism and the moving contact system; when the mechanism and the moving contact system are installed in the circuit breaker base a, the projection of the pin 4 and the limiting boss 102 on the radial plane of the shaft hole 201 should at least partially overlap during the movement of the mechanism and the moving contact system. Further, the specific installation process is as follows: First, install the moving contact system in the circuit breaker base a, and connect the mechanism crank arm 5 to the mechanism. Lift the connecting rod 2 and rotate it around the mounting shaft 3 until the projections of the shaft hole 201 and the limiting boss 102 onto the radial plane of the shaft hole 201 are completely offset and do not overlap. Then, insert the pin 4 from the side of the shaft hole 201 located on the limiting boss 102. Next, install the operating mechanism onto the base a. After installation, the mechanism acts on the mounting shaft 3 via the connecting rod 2, causing the moving contact system to rotate around the rotation center, i.e., the rotating shaft 105. During the movement of the mechanism and the moving contact system, the projections of the pin 4 and the limiting boss 102 on the contact support 1 onto the radial plane of the shaft hole 201 at least partially overlap, ensuring that the pin 4 will not fall off during the use of the circuit breaker.

[0048] As attached Figure 2 As shown, the mounting shaft 3 is mounted at both ends on the connecting holes 103 inside the contact support 1. (See attached diagram) Figure 7 As shown, the circuit breaker base a is provided with a clearance groove a01 to avoid the rotational stroke of the connecting rod 2 around the mounting shaft 3. (See attached diagram) Figure 6a and6b As shown, the inner side of the contact support 1 is provided with a fastening part 104 to limit the rotational stroke of the connecting rod 2. Specifically, in this embodiment, as shown in the attached figure... Figure 6a and 6b As shown, the tight fitting part 104 is a slot on the inner side of the contact support 1. When connecting the crank arm 5 and the connecting rod 2, the connecting rod 2 needs to be lifted. After the connecting rod 2 is inserted into the slot, it will not fall down, which facilitates the insertion of the pin shaft 4 and avoids the need to use tools to keep the connecting rod 2 in the lifted position, thus reducing the installation difficulty.

[0049] Example 2

[0050] In this embodiment, limiting bosses 102 are provided on both sides of the connecting rod 2 on the outer surface of the contact support 1. The diameter of the pin 4 is smaller than the diameter of the shaft hole 201. The end of the connecting rod 2 connected to the mechanism crank arm 5 is a U-shaped structure, the mechanism crank arm 5 is located between the two side walls of the U-shaped structure, and the shaft hole 201 is located on the two side walls; or the end of the mechanism crank arm 5 connected to the connecting rod 2 is a U-shaped structure, and the connecting rod 2 is located between the two side walls of the U-shaped structure. In this structure, the two limiting bosses 102 block the pin 4, so the pin 4 will not fall off, and no foolproof structure is needed.

[0051] This invention provides a connection structure for a circuit breaker moving contact system and mechanism, which simplifies the connection method of the circuit breaker moving contact system and mechanism, reduces the difficulty of assembly, avoids missing parts, and prevents parts from falling off during use.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A circuit breaker moving contact system and mechanism connection structure, comprising a contact support (1) and a connecting rod (2), one end of the connecting rod (2) extending into the inner side of the contact support (1) through a slot (101) on the contact support (1), the other end of the connecting rod (2) extending into the inner side of the contact support (1) through the slot (101) on the contact support (1) being rotatably mounted on the inner side of the contact support (1) via a mounting shaft (3), and the other end of the connecting rod (2) located outside the contact support (1) being connected to a mechanism crank arm (5) via a pin (4), characterized in that: A limiting boss (102) is provided on at least one side of the two sides of the connecting rod (2) on the outer surface of the contact support (1); The connecting rod (2) has a shaft hole (201) at one end located outside the contact support (1). The pin (4) passes through the shaft hole (201) and the hole on the mechanism crank arm (5) to connect the connecting rod (2) to the mechanism crank arm (5). When the mechanism and moving contact system are installed in the circuit breaker base (a), the projection of the pin (4) and the limiting boss (102) on the contact support (1) onto the plane radially located in the shaft hole (201) at least partially overlaps during the movement of the mechanism and moving contact system. When the operating mechanism is not installed on the circuit breaker base (a) and the moving contact system is installed in the circuit breaker base (a), the projection of the shaft hole (201) on the connecting rod (2) and the limiting boss (102) on the contact support (1) onto the plane radially located of the shaft hole (201) will not overlap at least once during the movement of the mechanism and the moving contact system.

2. The circuit breaker moving contact system and mechanism connection structure as described in claim 1, characterized in that: Limiting bosses (102) are provided on the outer surface of the contact support (1) on both sides of the connecting rod (2).

3. The circuit breaker moving contact system and mechanism connection structure as described in claim 2, characterized in that: The diameter of the pin (4) is smaller than the diameter of the hole (201).

4. The circuit breaker moving contact system and mechanism connection structure as described in claim 1, characterized in that: A limiting boss (102) is provided on the outer side of the contact support (1) on either side of the connecting rod (2).

5. The circuit breaker moving contact system and mechanism connection structure as described in claim 1, characterized in that: The mounting shaft (3) is mounted on the connecting holes (103) inside the contact support (1) at both ends.

6. The circuit breaker moving contact system and mechanism connection structure as described in claim 1, characterized in that: The circuit breaker base (a) is provided with a clearance groove (a01) to avoid the rotational stroke of the connecting rod (2) around the mounting shaft (3).

7. The circuit breaker moving contact system and mechanism connection structure as described in claim 1, characterized in that: The contact support (1) has a tight fit part (104) on its inner side, which can limit the rotation stroke of the connecting rod (2).

8. The circuit breaker moving contact system and mechanism connection structure as described in claim 7, characterized in that: The tight fitting part (104) is a slot on the inner side of the contact support (1) corresponding to the position of the connecting rod (2).

9. The circuit breaker moving contact system and mechanism connection structure as described in claim 2, characterized in that: The connecting rod (2) is connected to the crank arm (5) at one end in a U-shape. The crank arm (5) is located between the two side walls of the U-shape, and the shaft hole (201) is located on the two side walls. Alternatively, one end of the mechanism crank arm (5) connected to the connecting rod (2) is a U-shaped structure, and the connecting rod (2) is located between the two side walls of the U-shaped structure.

10. The circuit breaker moving contact system and mechanism connection structure as described in claim 4, characterized in that: The connecting rod (2) is connected to the crank arm (5) at one end in a U-shape. The crank arm (5) is located between the two side walls of the U-shape, and the shaft hole (201) is located on the two side walls. Alternatively, one end of the mechanism crank arm (5) connected to the connecting rod (2) is a U-shaped structure, and the connecting rod (2) is located between the two side walls of the U-shaped structure.

11. The circuit breaker moving contact system and mechanism connection structure as described in claim 10, characterized in that: The outer side wall of the U-shaped structure away from the limiting boss (102) is provided with a foolproof structure (202) to ensure that the pin (4) will not come out from the shaft hole (201) on the outer side wall of the U-shaped structure away from the limiting boss (102).

12. The circuit breaker moving contact system and mechanism connection structure as described in claim 11, characterized in that: The anti-foolproof structure (202) is a bent or welded structure on the side wall of the U-shaped structure that is away from the limiting boss (102).

13. The circuit breaker moving contact system and mechanism connection structure as described in claim 11, characterized in that: The diameter of the pin (4) is smaller than the diameter of the hole (201), and the projection of the anti-foolproof structure (202) on the plane containing the hole (201) on the connecting rod (2) at least partially overlaps with the projection of the hole (201) on the plane containing the radial direction of the hole (201). Alternatively, a boss is provided at one end of the pin (4), the diameter of which is larger than the diameter of the shaft hole (201). The boss is located between the side wall of the U-shaped structure that is close to the limiting boss (102) and the boss (102), and the projection of the anti-foolproof structure (202) and the boss on the plane in which the shaft hole (201) is located at least partially overlaps.

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