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 utility model belongs to the technical field of low-voltage electrical appliances, and specifically 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 more and more widespread. In the prior art, the circuit breakers originally used for AC systems cannot be used in DC systems, or they can be used in DC systems after being improved, but the existing circuit breakers for DC systems cannot meet the requirements of fast disconnection and non-polarity of the existing DC power systems. Even if there are some double-breakpoint circuit breakers that can be used in DC systems, they adopt a rotary structure, that is, two different moving contacts are installed on the same shaft, and 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, and it is difficult to arrange more arc-extinguishing grids, which results in limited arc-extinguishing ability of the circuit breaker, weak breaking ability, strict requirements on motion transmission, easy to get stuck, and difficult to process and assemble. Utility Model Content

[0003] The purpose of the utility model is to provide a double-breakpoint moving contact system in view of 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. 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, makes it less likely for motion jamming to occur, and improves the reliability and stability of motion transmission.

[0004] Technical Solution

[0005] In order to achieve the above technical objectives, the utility model provides a double-breakpoint moving contact system, characterized in that: the double-breakpoint moving contact system includes a contact seat, a left moving contact and a right moving contact are rotatably mounted on both sides of the contact seat, 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 of the embodiments, the protruding contact portions provided on the left moving contact and the right moving contact expose 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 seat is connected to a switch-off acceleration spring.

[0009] In one embodiment, the opening acceleration spring is arranged in a spring installation 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, and one end of the opening acceleration spring is connected to a contact seat, and the other end is fixedly mounted in the spring installation groove.

[0010] In one of the embodiments, the mounting portions of the left moving contact and the right moving contact are rotatably mounted in the moving contact mounting grooves on both sides of the inner cavity of the contact seat through 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 groove.

[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 of the embodiments, two 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 protrusion angle is provided at the upper end of the insulating member to increase the creepage distance.

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

[0017] In one of the embodiments, 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 moving contact system.

[0018] Beneficial Effects

[0019] The utility model provides a double-breakpoint moving contact system, which includes a contact seat, a left moving contact and a right moving contact rotatably mounted on both sides of the contact seat, an insulating member is mounted on the outer surface of the contact portion of the left moving contact and the right moving contact, and both ends of the pressure spring respectively abut against the inner side of the corresponding insulating member, and the left moving contact and the right moving contact are connected via a soft connection. The up and down movement of the moving contact system and the rotation of the moving contact itself are independent of each other, and the rotation installation of the left moving contact and the right moving contact and the up and down non-linear movement of the contact seat cooperate, so that the left moving contact and the right moving contact do not need to be symmetrically installed in the middle, which reduces the difficulty of assembling the double-breakpoint moving contact system, is not prone to jamming, and improves 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 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.

[0021] Attached Figure 1 It is a front view of the double-breakpoint moving contact system in Example 1 of the utility model.

[0022] Attached Figure 2 It is a schematic diagram of the exploded view of the double-breakpoint moving contact system in Example 1 of the utility model.

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

[0024] Attached 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 utility model.

[0025] Attached 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 utility model.

[0026] Attached Figure 6 It is a schematic diagram of the position relationship between the double-breakpoint moving contact system and the double-breakpoint static contact system in Example 1 of the utility model.

[0027] Attached Figure 7 It is a structural schematic diagram of the circuit breaker in the open state in Example 1 of the utility model. DETAILED DESCRIPTION

[0028] 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.

[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 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Example

[0034] In the prior art, circuit breakers used in DC power systems generally do not have a double breakpoint function. Even now, some circuit breakers with a double breakpoint function for DC power systems have appeared. The more common ones are double breakpoint circuit breakers. Considering the installation space of the circuit breaker and the arc extinguishing space required by the double 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 double breakpoint moving contact system, the motion transmission structure is complex, the assembly precision requirement is high, the reliability is poor, and transmission jamming is prone to occur.

[0035] In order to solve the above problems, the attached Figure 1 , 2, 3 and 4, this embodiment provides a double-breakpoint moving contact system, the double-breakpoint moving contact system a includes a contact base a1, a left moving contact a2 and a right moving contact a3 are rotatably mounted on both sides of the contact base a1, and the mounting parts 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 through contact shafts a7, a7'. The left moving contact a2 and the right moving contact a3 are limited in rotation travel by the moving contact mounting grooves a101, a101'. In order to prevent the arc generated when the circuit breaker is disconnected from damaging the contact seat a1, the outer surfaces of the contact parts of the left moving contact a2 and the right moving contact a3 are equipped with insulating parts a5, a5', and the two ends of the pressure spring a4 are respectively against the inner side of the corresponding insulating parts a5, a5', and the pressure spring a4 is installed in the pressure spring installation groove a102 on the contact seat a1. In this embodiment, the two ends of the pressure spring a4 are respectively placed in the pressure spring grooves a501, a501' on the inner side of the corresponding insulating parts a5, a5' and against the bottom of the pressure spring grooves a501, a501'. The upper ends of the insulating parts a5, a5' are provided with protruding angles a502, a502' to increase the 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 expose the insulating parts a5, a5' 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, and 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. Figure 5 and 6As shown, during the up and down movement of the contact seat a1, the contact seat a1 is driven to move by the cantilever 501 of the rotating shaft 5. During the rotation of the rotating shaft 5, the cantilever 501 drives the contact seat a1 to move up and down. Since the contact seat does not move linearly 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 with the contact seat, the protruding contact parts a201, a301 provided on the left moving contact a2 and the right moving contact a3 will respectively contact the static silver points b01a, b01' corresponding to the static contacts b01, b01' of the double-breakpoint static contact system b. b01a', and slightly rotate inwards under the action of the guide limit shaft 505, 505' and the corresponding static silver points b01a, b01a' of the static contacts b01, b01', so as to realize the 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 symmetrically installed in the middle, which reduces the difficulty of assembling the double-breakpoint moving contact system a, improves the reliability of motion transmission, and is not prone to jamming.

[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 disconnection acceleration spring 2. When the disconnection acceleration spring 2 is placed above the contact seat a1, the disconnection acceleration spring 2 is a tower spring or a compression spring. When the disconnection acceleration spring 2 is placed at the bottom of the contact seat a1, the disconnection 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 arranged in the spring installation 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 seat a1, and the other end is fixedly mounted on the bottom of the spring installation groove 102 on the housing 1. The opening acceleration spring 2 provides a downward force to the contact seat a1, so that it has a tendency 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 the 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 moving contact system a. During the rotation of the operating handle 7, the upper connecting rod 8, the trip buckle 9, and the lock buckle 10 can drive the rotating shaft 5 to rotate, and during the rotation of the rotating shaft 5, the lower connecting rod 6 can drive the double-breakpoint moving contact system a to move up and down, so that the double-breakpoint moving contact system a and the corresponding double-breakpoint static contact system b are in contact and separated, thereby realizing the on and off of the circuit breaker. This embodiment utilizes the structure of a cantilever 501 extending from the rotating shaft 5. When the rotating shaft rotates, the cantilever drives the double-moving point moving contact system a to move. The up and down movement of the double-break point moving contact system a is not a completely linear movement, and there is also left and right movement (generally speaking, the left and right movement amplitude of the double-break point moving contact system a is relatively small), that is, the double-break point moving contact system a can also achieve contact with the double-break point static contact system b by slightly deflecting it to the left or right, which effectively reduces the difficulty of assembly and improves the reliability of motion transmission.

[0039] 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.

[0040] 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 moving contact system, characterized in that: The double-breakpoint moving contact system (a) comprises a contact seat (a1), a left moving contact (a2) and a right moving contact (a3) ​​are rotatably mounted on both sides of the contact seat (a1), the outer surfaces of the contact parts of the left moving contact (a2) and the right moving contact (a3) ​​are provided with insulating parts (a5, a5'), the two ends of the pressure spring (a4) respectively press against the inner sides of the corresponding insulating parts (a5, a5'), and the left moving contact (a2) and the right moving contact (a3) ​​are connected via a soft connection (a6).

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

3. A double-breakpoint moving contact system as claimed in claim 1, characterized in that: The contact seat (a1) can slide up and down on the housing (1) via the slide groove (101).

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

5. A double-breakpoint moving contact system as claimed in 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 double-breakpoint moving contact system as claimed in claim 1, characterized in that: The mounting parts 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 seat (a1) via contact shafts (a7, a7').

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

8. A double-breakpoint moving contact system as claimed in 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. A double-breakpoint moving contact system as claimed in claim 1, characterized in that: The pressure spring (a4) is installed in the pressure spring installation groove (a102) on the contact seat (a1).

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

11. A double-breakpoint moving contact system as claimed in 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. A double-breakpoint moving contact system as claimed in 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. A double-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 a contact seat (a1) of the double-breakpoint moving contact system (a).

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