Double-breakpoint moving contact system

Abstract

A double-breakpoint moving contact system comprises a contact base, a left moving contact and a right moving contact are rotatably installed on the two sides of the contact base, insulating parts are installed on the outer surfaces of the contact parts of the left moving contact and the right moving contact, the two ends of a pressure spring abut against the inner sides of the corresponding insulating parts respectively, and the two ends of the pressure spring abut against the inner sides of the corresponding insulating parts respectively. The left moving contact and the right moving contact are in flexible connection. The up-and-down movement of the moving contact system and the rotation of the moving contacts are mutually independent, and the rotary installation of the left moving contact and the right moving contact is matched with the up-and-down non-linear movement of the contact seat, so that the left moving contact and the right moving contact do not need to be symmetrically installed in the middle, the assembly difficulty of the double-breakpoint moving contact system is reduced, the clamping stagnation phenomenon is not easy to occur, and the service life of the double-breakpoint moving contact system is prolonged. And the reliability and the stability of motion transmission are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a double-breakpoint moving contact system. 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 increasingly widespread. In the existing technology, circuit breakers originally used for AC systems cannot be used in DC systems, or can be used in DC systems after being modified. However, the existing circuit breakers for DC systems cannot meet the requirements of the existing DC power system for fast disconnection and non-polarity. 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. The rotation of the rotating shaft drives the moving contact to contact the static contact during the rotation process, thereby achieving the purpose of double breakpoints. This type of rotary double-breakpoint circuit breaker is large in size, making it difficult to arrange more arc extinguishing grids, resulting in limited arc extinguishing ability and weak breaking ability of the circuit breaker. In addition, it has strict requirements on motion transmission, is prone to jamming, and is difficult to process and assemble. Summary of the Invention

[0003] The purpose of the present invention is to address the defects of the circuit breaker used in the DC power system, such as complex motion transmission structure, difficult assembly, easy jamming, poor reliability and poor breaking performance, and to provide a double-breakpoint moving contact system. The up and down movement of the moving contact system and the rotation of the moving contact itself are independent of each other, which reduces the difficulty of assembly and installation of the product, is less likely to cause motion jamming, and improves the reliability and stability of motion transmission.

[0004] Technical Solution

[0005] In order to achieve the above-mentioned technical objectives, the present invention provides a double-breakpoint moving contact system, characterized in that: the double-breakpoint moving contact system includes a contact base, a left moving contact and a right moving contact are rotatably mounted on both sides of the contact base, the outer surfaces of the contact parts of the left moving contact and the right moving contact are equipped with insulating parts, the two ends of the pressure spring respectively press against the inner sides of the corresponding insulating parts, and the left moving contact and the right moving contact are connected by a soft connection.

[0006] In one embodiment, the protruding contact portions provided on the left moving contact and the right moving contact are exposed from the insulating member and correspond to the double-breakpoint static contact system.

[0007] In one embodiment, the contact seat can slide up and down on the housing through a sliding groove.

[0008] In one embodiment, the contact base is connected to a trip acceleration spring.

[0009] In one embodiment, the opening acceleration spring is disposed in a spring mounting groove on a housing between a left arc extinguishing chamber and a right arc extinguishing chamber on both sides of the double-breakpoint moving contact system, one end of the opening acceleration spring is connected to the contact base, and the other end is fixedly mounted in the spring mounting groove.

[0010] In one embodiment, the mounting portions of the left movable contact and the right movable contact are rotatably mounted in the movable contact mounting grooves on both sides of the inner cavity of the contact base via contact shafts.

[0011] In one embodiment, the left moving contact and the right moving contact are limited in rotational travel by the moving contact mounting slots.

[0012] In one embodiment, the contact holder includes a contact base and a contact upper cover, and the contact base and the contact upper cover are locked together.

[0013] In one embodiment, the pressure spring is installed in a pressure spring installation groove on the contact base.

[0014] In one embodiment, both ends of the pressure spring are respectively placed in the pressure spring grooves on the inner side of the corresponding insulating member and abut against the bottom of the pressure spring grooves.

[0015] In one embodiment, a protruding corner is provided on the upper end of the insulating member to increase the creepage distance.

[0016] In one embodiment, guide limit shafts are provided at corresponding positions on the housing outside the left moving contact and the right moving contact.

[0017] In one embodiment, a cantilever extends from the rotating shaft, one end of the lower connecting rod is mounted on the end of the cantilever, and the other end is mounted on the contact seat of the double-breakpoint contact system.

[0018] Beneficial effects

[0019] The present invention provides a dual-breakpoint moving contact system, comprising a contact base, a left moving contact and a right moving contact rotatably mounted on either side of the contact base, the outer surfaces of the contact portions of the left and right moving contacts being mounted with insulating members, the ends of a pressure spring respectively abutting against the inner sides of the corresponding insulating members, and the left and right moving contacts being connected via a flexible connection. The up-and-down movement of the moving contact system and the rotation of the moving contacts themselves are independent of each other. The rotational installation of the left and right moving contacts and the coordination of the up-and-down non-linear movement of the contact base eliminate the need for symmetrical installation of the left and right moving contacts in the middle, thereby reducing the difficulty of assembling the dual-breakpoint moving contact system, making it less prone to jamming, and improving the reliability and stability of motion transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Attachment Figure 1 This is a front view of the double-breakpoint moving contact system in Example 1 of the present invention.

[0022] Attachment Figure 2 It is a schematic diagram of the decomposition of the double-breakpoint moving contact system in Example 1 of the present invention.

[0023] Attachment Figure 3 It is a schematic diagram of the internal installation structure of the double-breakpoint moving contact system in Example 1 of the present invention.

[0024] Attachment Figure 4 It is a schematic diagram of the exploded connection relationship between the left moving contact and the right moving contact of the double-breakpoint moving contact system in Example 1 of the present invention.

[0025] Attachment Figure 5 It is an axonometric diagram of the positional relationship between the double-breakpoint moving contact system and the double-breakpoint static contact system in Example 1 of the present invention.

[0026] Attachment Figure 6 Schematic diagram of the positional relationship between the double-breakpoint moving contact system and the double-breakpoint static contact system in Example 1 of the present invention.

[0027] Attachment Figure 7 It is a structural schematic diagram of the circuit breaker in the open state in embodiment 1 of the present invention. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] 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 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.

[0030] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0031] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can 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 intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as 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 of the relevant listed items.

[0033] Example

[0034] In the prior art, circuit breakers used in DC power systems generally do not have a dual breakpoint function. Even now, some circuit breakers with a dual breakpoint function for DC power systems have emerged, and the more common ones are dual breakpoint circuit breakers. Considering the installation space of the circuit breaker and the arc extinguishing space required by the dual breakpoint circuit breaker, the moving contact system of the double breakpoint circuit breaker is changed from traditional rotation to linear motion. However, in the prior art solution, the rotation of the operating mechanism handle is converted into the linear motion of the dual breakpoint moving contact system, the motion transmission structure is complex, the assembly precision requirements are high, the reliability is poor, and the transmission is prone to jamming.

[0035] In order to solve the above problems, the attached Figure 1 As shown in Figures 2, 3, and 4, this embodiment provides a dual-breakpoint moving contact system. The dual-breakpoint moving contact system a includes a contact base a1, a left moving contact a2, and a right moving contact a3 rotatably mounted on either side of the contact base a1. The mounting portions of the left moving contact a2 and the right moving contact a3 are rotatably mounted in moving contact mounting grooves a101, a101' on either side of the inner cavity of the contact base a1 via contact shafts a7, a7'. The rotational travel of the left moving contact a2 and the right moving contact a3 is limited by the moving contact mounting grooves a101, a101'. To prevent arc damage to contact base a1 from occurring when the circuit breaker trips, the outer surfaces of the contact portions of the left and right moving contacts a2 and a3 are fitted with insulating members a5 and a5'. The two ends of a pressure spring a4 rest against the inner sides of the corresponding insulating members a5 and a5'. The pressure spring a4 is mounted in a pressure spring mounting slot a102 on the contact base a1. In this embodiment, the two ends of the pressure spring a4 are positioned within pressure spring slots a501 and a501' within the corresponding insulating members a5 and a5', resting against the bottoms of the pressure spring slots a501 and a501'. The upper ends of the insulating members a5 and a5' are provided with protruding corners a502 and a502' to increase creepage distance.

[0036] The left moving contact a2 and the right moving contact a3 are connected via a soft connection a6. Figure 1 As shown, the protruding contact parts a201, a301 provided on the left moving contact a2 and the right moving contact a3 are exposed from the insulating parts a5, 5' and correspond to the double-breakpoint static contact system b. Figure 7 As shown, in order to guide and limit the movement of the left moving contact a2 and the right moving contact a3, guide and limit shafts 103, 103' are provided at corresponding positions on the housing 1 outside the left moving contact a2 and the right moving contact a3. The guide and limit shafts 505, 505' can provide pressure for the left moving contact a2 and the right moving contact a3 to rotate inward during the movement. With this structure, as shown in the attached Figure 5 and 6As shown, during the up-and-down movement of the contact base a1, the contact base a1 is driven by the cantilever 501 of the rotating shaft 5. During the rotation of the rotating shaft 5, the cantilever 501 drives the contact base a1 to move up and down. Since the contact base does not move in a straight line up and down, the left moving contact a2 and the right moving contact a3 always have a tendency to rotate outward under the action of the pressure spring a4. During the upward movement of the left moving contact a2 and the right moving contact a3 as the contact base moves upward, the protruding contact portions a201 and a301 provided on the left moving contact a2 and the right moving contact a3 will respectively contact the corresponding static silver points b01a, b01' of the static contacts b01 and b01' of the double-breakpoint static contact system b. b01a', and slightly rotate inward under the action of the guide limit shaft 505, 505' and the corresponding static silver points b01a, b01a' of the static contacts b01, b01', thereby achieving close contact between the protruding contact parts a201, a301 and the corresponding static silver points b01a, b01a' of the static contacts b01, b01'. At the same time, the rotating installation of the left moving contact a2 and the right moving contact a3 and the coordination of the up and down non-linear movement of the contact seat make it unnecessary for the left moving contact a2 and the right moving contact a3 to be installed symmetrically in the middle, thereby reducing the difficulty of assembling the double-breakpoint moving contact system a, improving the reliability of motion transmission, and making it less likely to get stuck.

[0037] In order to ensure smooth movement and easy installation, the contact seat a1 includes a contact base a103 and a contact upper cover a104, and the contact base a103 and the contact upper cover a104 are locked together. The contact seat a1 can slide up and down on the shell 1 through the slide groove 101. Generally speaking, if the slide groove 101 is installed on the shell 1, the slide rail needs to be installed on the contact seat a1. On the contrary, if the slide groove 101 is installed on the contact seat a, the slide rail needs to be installed on the shell 1. The contact seat a1 is connected to a trip acceleration spring 2. When the trip acceleration spring 2 is placed above the contact seat a1, the trip acceleration spring 2 is a tower spring or a compression spring. When the trip acceleration spring 2 is placed at the bottom of the contact seat a1, the trip acceleration spring 2 is a tension spring. As shown in the attached figure Figure 7 As shown, in this embodiment, the opening acceleration spring 2 is disposed in a spring mounting groove 102 on the housing 1 between the left arc extinguishing chamber 3 and the right arc extinguishing chamber 4 on both sides of the double-breakpoint moving contact system a. One end of the opening acceleration spring 2 is connected to the contact base a1, and the other end is fixedly mounted on the bottom of the spring mounting groove 102 on the housing 1. The opening acceleration spring 2 provides a downward force to the contact base a1, causing it to tend to move downward.

[0038] In this embodiment, as shown in the attached Figure 7As shown, a cantilever 501 extends from the rotating shaft 5. One end of a lower connecting rod 6 is mounted on the end of the cantilever 501, and the other end is mounted on the contact seat a1 of the dual-breakpoint contact system a. During rotation of the operating handle 7, the upper connecting rod 8, the trip latch 9, and the lock latch 10 can drive the rotating shaft 5 to rotate. During rotation of the rotating shaft 5, the lower connecting rod 6 can drive the dual-breakpoint moving contact system a to move up and down, thereby causing the dual-breakpoint moving contact system a to contact and separate with the corresponding dual-breakpoint static contact system b, thereby achieving the switching of the circuit breaker. This embodiment utilizes the structure of the cantilever 501 extending from the rotating shaft 5. When the rotating shaft rotates, the cantilever drives the dual-breakpoint moving contact system a to move. The up and down movement of the dual-breakpoint moving contact system a is not completely linear, but also involves left and right movement (generally, the left and right movement of the dual-breakpoint moving contact system a is relatively small). That is, even a slight left and right deflection of the dual-breakpoint moving contact system a can still achieve contact with the dual-breakpoint static contact system b, effectively reducing the difficulty of assembly and improving the reliability of motion transmission.

[0039] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0040] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A double-breakpoint moving contact system, characterized in that: The double-breakpoint moving contact system (a) includes a contact base (a1), a left moving contact (a2) and a right moving contact (a3) ​​rotatably mounted on both sides of the contact base (a1), insulating parts (a5, a5') being mounted on the outer surfaces of the contact parts of the left moving contact (a2) and the right moving contact (a3), and two ends of a pressure spring (a4) respectively abutting against the inner sides of the corresponding insulating parts (a5, a5'), and the left moving contact (a2) and the right moving contact (a3) ​​being connected via a soft connection (a6).

2. A dual-breakpoint moving contact system according to claim 1, characterized in that: The protruding contact portions (a201, a301) provided on the left moving contact (a2) and the right moving contact (a3) ​​expose the insulating parts (a5, 5') and correspond to the double-breakpoint static contact system (b).

3. A dual-breakpoint moving contact system according to claim 1, characterized in that: The contact seat (a1) can slide up and down on the housing (1) through the sliding groove (101).

4. A dual-breakpoint moving contact system according to claim 1, characterized in that: The contact seat (a1) is connected to a switch-off acceleration spring (2).

5. A dual-breakpoint moving contact system according to claim 4, characterized in that: The opening acceleration spring (2) is arranged in a spring mounting groove (102) on a housing (1) between a left arc extinguishing chamber (3) and a right arc extinguishing chamber (4) on both sides of the double-breakpoint moving contact system (a); one end of the opening acceleration spring (2) is connected to a contact seat (a1), and the other end is fixedly mounted in the spring mounting groove (102).

6. A dual-breakpoint moving contact system according to claim 1, characterized in that: The mounting portions of the left moving contact (a2) and the right moving contact (a3) ​​are rotatably mounted in the moving contact mounting grooves (a101, a101') on both sides of the inner cavity of the contact base (a1) via contact shafts (a7, a7').

7. A dual-breakpoint moving contact system according to claim 6, characterized in that: The left moving contact (a2) and the right moving contact (a3) ​​are limited in their rotational travel by the moving contact mounting grooves (a101, a101').

8. The dual-breakpoint moving contact system according to claim 1, characterized in that: The contact seat (a1) comprises a contact base (a103) and a contact upper cover (a104), and the contact base (a103) and the contact upper cover (a104) are locked together.

9. The dual-breakpoint moving contact system according to claim 1, characterized in that: The pressure spring (a4) is installed in the pressure spring installation groove (a102) on the contact base (a1).

10. A dual-breakpoint moving contact system according to claim 9, characterized in that: Both ends of the pressure spring (a4) are respectively placed in the pressure spring grooves (a501, a501') inside the corresponding insulating parts (a5, a5') and abut against the bottoms of the pressure spring grooves (a501, a501').

11. The dual-breakpoint moving contact system according to claim 1, characterized in that: The upper end of the insulating member (a5, a5') is provided with a protruding corner (a502, a502') for increasing the creepage distance.

12. The dual-breakpoint moving contact system according to claim 1, characterized in that: Guide limit shafts (103, 103') are provided at corresponding positions on the housing 1 outside the left moving contact (a2) and the right moving contact (a3).

13. The dual-breakpoint moving contact system according to claim 1, characterized in that: A cantilever (501) extends from the rotating shaft (5), one end of a lower connecting rod (6) is mounted on the end of the cantilever (501), and the other end is mounted on the contact seat (a1) of the double-breakpoint contact system (a).

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