Internal layout structure of circuit breaker

Abstract

An internal layout structure of a circuit breaker is characterized in that an operating handle (1) is arranged above an inner cavity of a shell (2), a rotating shaft (3) is arranged on the right side of the lower portion of the operating handle (1), and a double-breakpoint moving contact system (a) is arranged under the operating handle (1) and can move in the space of the shell (2) on the left side of the rotating shaft (3). An arc striking structure group (6) and an arc extinguish chamber group (7) are sequentially arranged on the two sides of the double-breakpoint moving contact system (a) and located in the space of the shell (2) below the rotating shaft (3) from top to bottom, the double-breakpoint static contact system (b) corresponds to the double-breakpoint moving contact system (a), and a magnetic tripping system (8) is installed on the side, where the rotating shaft (3) is installed, in the shell (2) and located on the outer side of a right arc extinguish chamber (701) in the arc extinguish chamber group (7). And a thermal tripping system (9) is arranged on the outer side of a left arc extinguish chamber (702) in the arc extinguish chamber group (7) on one side, separated from the mounting rotating shaft (3), in the shell (2). According to the layout of the whole circuit breaker, more arc extinguishing grid sheets can be arranged in the circuit breaker, and the breaking capacity of the circuit breaker is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an internal layout structure of a 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 increasingly widespread. In the existing technology, circuit breakers originally used for AC systems cannot be used in DC systems, or they 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 adopt 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 capacity of the circuit breaker. Summary of the Invention

[0003] The purpose of the present invention is to address the defects of the above-mentioned circuit breakers used in DC power systems, such as large size and poor breaking performance, and to provide an internal layout structure of a circuit breaker. By rearranging the installation positions of various functional components inside the circuit breaker, the space occupied by the circuit breaker is effectively reduced, thereby allowing more arc extinguishing grids to be arranged inside the circuit breaker, thereby improving the breaking capacity of the circuit breaker.

[0004] Technical Solution

[0005] In order to achieve the above technical objectives, the present invention provides an internal layout structure of a circuit breaker, characterized in that: the operating handle is arranged above the inner cavity of the shell, the rotating shaft is arranged at the right side below the operating handle, the double-breakpoint moving contact system is arranged at a position directly below the operating handle and can move in the shell space on the left side of the rotating shaft, the trip latch and the lock latch are arranged on the rotating shaft, and the arc striking structure group and the arc extinguishing chamber group are arranged in sequence in the shell space below the rotating shaft on both sides of the double-breakpoint moving contact system, the double-breakpoint static contact system corresponds to the double-breakpoint moving contact system, the side of the shell where the rotating shaft is installed is located on the outside of the right arc extinguishing chamber in the arc extinguishing chamber group and is equipped with a magnetic tripping system, and the side of the shell where the rotating shaft is installed is located on the outside of the left arc extinguishing chamber in the arc extinguishing chamber group and is equipped with a thermal tripping system.

[0006] In one embodiment, the jump buckle and the lock buckle are arranged on the rotating shaft.

[0007] In one embodiment, the operating end of the operating handle extends out of the housing.

[0008] In one embodiment, a right wiring terminal is installed in the housing outside the magnetic tripping system.

[0009] In one embodiment, the shell is in a convex shape.

[0010] In one embodiment, a trip acceleration spring is connected to the bottom of the double-breakpoint moving contact system.

[0011] In one embodiment, the opening acceleration spring is arranged 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.

[0012] In one embodiment, the bimetallic strip in the thermal trip system extends to the bottom position above the double-break moving contact system and is linked to a trip rod extending from the lock.

[0013] In one embodiment, the left arc extinguishing chamber and / or the right arc extinguishing chamber in the arc extinguishing chamber group are arranged horizontally or obliquely on both sides of the double-breakpoint moving contact system to independently extinguish the arc generated when the corresponding left moving contact and right moving contact in the double-breakpoint moving contact system are disconnected.

[0014] In one embodiment, the arc inlets of the left arc extinguishing chamber and the right arc extinguishing chamber respectively correspond to the arc outlets of the corresponding arc striking channels, and the arc outlets of the left arc extinguishing chamber and the right arc extinguishing chamber correspond to the corresponding exhaust ports on the shell.

[0015] Beneficial effects

[0016] The present invention provides an internal layout structure for a circuit breaker, wherein the operating handle is arranged above the inner cavity of the housing, the rotating shaft is arranged below the operating handle to the right, the dual-breakpoint moving contact system is arranged directly below the operating handle and can move within the housing space to the left of the rotating shaft, the trip latch and the lock latch are arranged on the rotating shaft, the arc striking structure group and the arc extinguishing chamber group are arranged in sequence in the housing space below the rotating shaft on both sides of the dual-breakpoint moving contact system, the magnetic tripping system is installed on the side of the housing where the rotating shaft is installed and located outside the right arc extinguishing chamber in the arc extinguishing chamber group, and the thermal tripping system is installed on the side of the housing away from the rotating shaft and located outside the left arc extinguishing chamber in the arc extinguishing chamber group. By improving the installation positions of the various functional components inside the circuit breaker, the internal layout of the circuit breaker is optimized, allowing more arc extinguishing grids to be arranged inside the circuit breaker, thereby improving the breaking capacity of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Attachment Figure 1 It is a structural schematic diagram of the circuit breaker in the open state in embodiment 1 of the present invention.

[0019] Attachment Figure 2 It is a structural schematic diagram of the circuit breaker in the closed state in embodiment 1 of the present invention.

[0020] Attachment Figure 3 This is a front view of the double-breakpoint moving contact system in Example 1 of the present invention.

[0021] Attachment Figure 4 It is a schematic diagram of the decomposition of the double-breakpoint moving contact system in Example 1 of the present invention.

[0022] Attachment Figure 5 It is a schematic diagram of the internal installation structure of the double-breakpoint moving contact system in Example 1 of the present invention.

[0023] Attachment Figure 6 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.

[0024] Attachment Figure 7 Schematic diagram of the positional relationship between the arc striking structure group and the double-breakpoint static contact system in Example 1 of the present invention Figure 1 .

[0025] Attachment Figure 8 Schematic diagram of the positional relationship between the arc striking structure group and the double-breakpoint static contact system in Example 1 of the present invention Figure 2 .

[0026] Attachment Figure 9 This is a schematic diagram of the installation of the arc extinguishing chamber group in Example 2 of the present invention. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Example 1

[0033] In the prior art, the rotary double-break circuit breaker used in the DC power system is relatively large in size, making it difficult to arrange more arc-extinguishing grids, resulting in limited arc-extinguishing capability and weak breaking capability of the circuit breaker.

[0034] In order to solve the above problems, the attached Figure 1 and 2As shown, this embodiment provides an internal layout structure of a circuit breaker. The operating handle 1 is disposed above the inner cavity of the housing 2, with the operating end of the operating handle 1 extending out of the housing 2. A rotating shaft 3 is disposed to the right of the operating handle 1. A dual-breakpoint moving contact system a is disposed directly below the operating handle 1 (directly below does not mean the centers are aligned, as long as they are vertically aligned) and is movable within the housing 2 space to the left of the rotating shaft 3. A trip latch 4 and a lock latch 5 are disposed on the rotating shaft 3. An arc striking structure group 6 and an arc extinguishing chamber group 7 are disposed in sequence above and below the housing 2 space below the rotating shaft 3 on either side of the dual-breakpoint moving contact system a. A dual-breakpoint static contact system b corresponds to the dual-breakpoint moving contact system a. A magnetic trip system 8 is mounted on the side of the housing 2 where the rotating shaft 3 is mounted, located outside the right arc extinguishing chamber 701 of the arc extinguishing chamber group 7. A thermal trip system 9 is mounted on the side of the housing 2 away from the rotating shaft 3, located outside the left arc extinguishing chamber 702 of the arc extinguishing chamber group 7. The bimetallic strip 901 in the thermal trip system 9 extends to the bottom position above the dual-break moving contact system a and is linked to the trip rod 501 extending from the lock 5. The bimetallic strip 901 is connected to the static contacts b01 and b01' of the dual-break static contact system b via a flexible connector, forming a circuit. A clearance notch is provided on the corresponding side of the dual-break static contact system b to avoid the bimetallic strip 901. A right terminal 10 is mounted within the housing 2, outside the magnetic trip system 8. A trip acceleration spring a6 is connected to the bottom of the dual-break moving contact system a.

[0035] In the above-described layout, the housing 2 is preferably convex in shape to minimize the size of the circuit breaker. The dual-breakpoint circuit breaker with the above-described internal layout achieves the goal of increasing the number of arc-extinguishing grids. Next, the function and structure of the contact system and arc-extinguishing chamber in this layout will be further described with reference to the accompanying drawings.

[0036] As attached Figure 3 , 4, 5 and 6, in this embodiment, the double-breakpoint moving contact system a includes a contact base a1, and the left moving contact a2 and the right moving contact a3 are rotatably mounted on both sides of the contact base a1. The left moving contact a2 and the right moving contact a3 are connected by a soft connection a8. In this embodiment, 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 and a101' on both sides of the inner cavity of the contact base a1 through contact shafts a7 and a7'. As shown in the attached Figure 5 and 6As shown, in order to prevent the arc generated when the circuit breaker is disconnected from damaging the contact base 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'. The two ends of the pressure spring a4 respectively press against the inner sides of the corresponding insulating parts a5, a5'. The pressure spring a4 is installed in the pressure spring mounting groove a102 on the contact base a1. At the same time, 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, a5' and correspond to the double-breakpoint static contact system b. 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'. In this embodiment, for smooth and convenient movement, the contact base a1 can slide up and down on the housing 2 through a slide groove (not shown in the drawings). If the slide groove is installed on the housing 2 , the slide rail needs to be installed on the contact base a1 . Conversely, if the slide groove is installed on the contact base a1 , the slide rail needs to be installed on the housing 2 .

[0037] The contact base a1 includes a contact base a103 and a contact upper cover a104, which are locked together. The bottom of the contact base a1 is connected to a trip acceleration spring a6. Figure 1 As shown, the opening acceleration spring a6 is installed in the spring mounting slot 201 of the housing 2 between the left arc extinguishing chamber 702 and the right arc extinguishing chamber 701 on either side of the double-breakpoint moving contact system a. One end is connected to the contact holder a1, and the other end is fixed to the bottom of the spring mounting slot 201 of the housing 2. The left arc extinguishing chamber 702 and the right arc extinguishing chamber 701 are separated by the spring mounting slot 201 of the housing 2. The opening acceleration spring a6 applies a downward pulling force to the contact holder a1, causing it to move downward.

[0038] In a circuit breaker with a double breakpoint function, the arc extinguishing capability is required to be high, and the breaking arc needs to be quickly introduced into the arc extinguishing chamber for extinguishing. Therefore, in this embodiment, if Figure 1 As shown, an arc striking structure group 6 is provided at the entrance of the arc extinguishing chamber. Under the action of the arc striking structure group 6, the breaking arc is quickly introduced into the corresponding left arc extinguishing chamber 702 and right arc extinguishing chamber 701 along the arc striking channel.

[0039] Further, as attached Figure 7 and 8As shown, in this embodiment, the static contacts b01 and b01' in the double-breakpoint static contact system b include arc-striking portions b01a and b01a', the tails of which are connected to downward-bending static arc-striking plates b01d and b01d'. The fronts of the arc-striking portions b01a and b01a' extend upward-bending contact portions b01b and b01b', and the contact portions b01b and b01b' are equipped with static silver contacts b01c and b01c'. The arc-striking portions b01a and b01a', static arc-striking plates b01d and b01d', and contact portions b01b and b01b' are installed together or in an integrated manner. In this embodiment, the arc-striking portions b01a and b01a', static arc-striking plates b01d and b01d', and contact portions b01b and b01b' are installed in an integrated manner. The static arc-striking plates b01d, b01d' extend to the top of the corresponding arc-extinguishing grids in the left arc-extinguishing chamber 702 and the right arc-extinguishing chamber 701. Figure 1 As shown, moving arc-striking plates b01e, b01e' are arranged at one end of the left arc-extinguishing chamber 702 and the right arc-extinguishing chamber 701 corresponding to the left moving contact a2 and the right moving contact a3 respectively.

[0040] The structure of the static contacts b01, b01' can effectively contact the protruding contact parts a201, a301 set on the left moving contact a2 and the right moving contact a3 in the contact base a1 that moves up and down, and can also match the position of the arc striking structure group 6, which is conducive to breaking the arc and quickly entering the arc extinguishing chamber.

[0041] As attached Figure 1 and 2 As shown, the left arc extinguishing chamber 702 and / or the right arc extinguishing chamber 701 in the arc extinguishing chamber group 7 are arranged obliquely on both sides of the double-break moving contact system a to independently extinguish the arc generated when the corresponding left moving contact a2 and right moving contact a3 in the double-break moving contact system a are disconnected. The arc inlets of the left arc extinguishing chamber 702 and the right arc extinguishing chamber 701 correspond to the arc outlets of the corresponding arc striking channels, and the arc outlets of the left arc extinguishing chamber 702 and the right arc extinguishing chamber 701 correspond to the corresponding exhaust ports on the housing 2. The arc generated by the disconnection of the left moving contact a2 and the right moving contact a3 in the double-break moving contact system a and the corresponding static contacts b01 and b01' in the double-break static contact system b enters the corresponding left arc extinguishing chamber 702 and the right arc extinguishing chamber 701 through the corresponding arc striking channels, and then is discharged from the housing through the corresponding exhaust ports. Different moving contacts correspond to different arc extinguishing chambers, which effectively improves the arc extinguishing capacity of the arc extinguishing chamber and improves the breaking performance of the circuit breaker.

[0042] Example 2

[0043] As attached Figure 9As shown, in this embodiment, the left arc extinguishing chamber 702 and / or the right arc extinguishing chamber 701 in the arc extinguishing chamber group 7 are horizontally arranged on both sides of the double-breakpoint moving contact system a. Other structures and working principles are the same as those in embodiment 1.

[0044] The present invention provides an internal layout structure of a circuit breaker, wherein the operating handle can drive the rotating shaft to rotate through the upper connecting rod, the jumper and the lock during the rotation of the operating handle, and the lower connecting rod can drive the double-breakpoint moving contact system to move up and down during the rotation of the rotating shaft, so that the double-breakpoint moving contact system and the corresponding double-breakpoint static contact system are in contact and separation, thereby realizing the on and off of the circuit breaker. By simply improving the installation position of each functional component inside the circuit breaker, the internal layout of the circuit breaker is optimized, so that more arc-extinguishing grids can be arranged in the circuit breaker, thereby improving the breaking capacity of the circuit breaker. It should also be noted that the embodiment of the present invention provides a detailed description of the contact system and the arc-extinguishing chamber in the layout structure, which does not mean that the layout structure claimed to be protected by the present invention is only applicable to the contact system and arc-extinguishing chamber mentioned in the above embodiment. Any technical solution inspired by the embodiment of the present invention should be deemed to fall within the scope of protection of the claims of the present invention.

[0045] 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.

[0046] 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. An internal layout structure of a circuit breaker, characterized by: The operating handle (1) is arranged above the inner cavity of the housing (2), the rotating shaft (3) is arranged at the right side below the operating handle (1), the double-breakpoint moving contact system (a) is arranged at a position directly below the operating handle (1) and can move in the housing (2) space on the left side of the rotating shaft (3), the arc striking structure group (6) and the arc extinguishing chamber group (7) are arranged in sequence in the housing (2) space below the rotating shaft (3) on both sides of the double-breakpoint moving contact system (a), the double-breakpoint static contact system (b) corresponds to the double-breakpoint moving contact system (a), the side of the housing (2) where the rotating shaft (3) is installed is located outside the right arc extinguishing chamber (701) in the arc extinguishing chamber group (7) and is equipped with a magnetic tripping system (8), and the side of the housing (2) away from the rotating shaft (3) is located outside the left arc extinguishing chamber (702) in the arc extinguishing chamber group (7) and is equipped with a thermal tripping system (9).

2. The internal layout structure of a circuit breaker according to claim 1, characterized in that: The jump buckle (4) and the lock buckle (5) are arranged on the rotating shaft (3).

3. The internal layout structure of a circuit breaker according to claim 1, characterized in that: The operating end of the operating handle (1) extends out of the housing (2).

4. The internal layout structure of a circuit breaker according to claim 3, characterized in that: A right wiring terminal (10) is installed in the housing (2) outside the magnetic tripping system (8).

5. The internal layout structure of a circuit breaker according to claim 3, characterized in that: The shell (2) is in a convex shape.

6. The internal layout structure of a circuit breaker according to claim 3, characterized in that: The bottom of the double-breakpoint moving contact system (a) is connected to a breaking acceleration spring (a6).

7. The internal layout structure of a circuit breaker according to claim 6, characterized in that: The opening acceleration spring (a6) is arranged in a spring installation groove (201) on the housing (2) between the left arc extinguishing chamber (702) and the right arc extinguishing chamber (701) on both sides of the double-breakpoint moving contact system (a).

8. The internal layout structure of a circuit breaker according to claim 1, characterized in that: The bimetallic strip (901) in the thermal tripping system (9) extends to the bottom position above the double-breakpoint moving contact system (a) and is linked to the tripping rod (501) extending from the lock (5).

9. The internal layout structure of a circuit breaker according to claim 1, characterized in that: The left arc extinguishing chamber (702) and / or the right arc extinguishing chamber (701) in the arc extinguishing chamber group (7) are arranged horizontally or obliquely on both sides of the double-breakpoint moving contact system (a) to independently extinguish the arc generated when the corresponding left moving contact (a2) and right moving contact (a3) ​​in the double-breakpoint moving contact system (a) are disconnected.

10. The internal layout structure of a circuit breaker according to claim 9, characterized in that: The arc inlets of the left arc extinguishing chamber (702) and the right arc extinguishing chamber (701) respectively correspond to the arc outlets of the corresponding arc striking channels, and the arc outlets of the left arc extinguishing chamber (702) and the right arc extinguishing chamber (701) correspond to the corresponding exhaust ports on the housing (2).

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