Internal layout structure of a circuit breaker

Abstract

An internal layout structure of a circuit breaker, characterized in that: an operating handle (1) is arranged above an inner cavity of a housing (2), a rotating shaft (3) is arranged at a right position below the operating handle (1), a double-breakpoint moving contact system (a) is arranged at a position directly below the operating handle (1) and can move in a housing (2) space on the left side of the rotating shaft (3), arc-striking structure groups (6) and arc-extinguishing chamber groups (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), a double-breakpoint static contact system (b) corresponds to the double-breakpoint moving contact system (a), a magnetic tripping system (8) is installed on the side of the housing (2) where the rotating shaft (3) is installed and located on the outside of a right arc-extinguishing chamber (701) in the arc-extinguishing chamber group (7), and a thermal tripping system (9) is installed on the side of the housing (2) where the rotating shaft (3) is installed and located on the outside of a left arc-extinguishing chamber (702) in the arc-extinguishing chamber group (7). The layout of the entire circuit breaker enables more arc-extinguishing grids to be arranged in the circuit breaker, thereby improving the breaking capacity of the circuit breaker.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and specifically 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 more and more widespread. In the prior art, the circuit breakers originally used for AC systems cannot be used in DC systems, or can be used in DC systems after being improved, but the existing circuit breakers for DC systems cannot meet the requirements of fast disconnection and non-polarity of the existing DC power system. 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, and the rotating shaft is rotated to drive 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 and weak breaking ability. Utility Model Content

[0003] The purpose of the utility model is to provide an internal layout structure of a circuit breaker for the defects of large size and poor breaking performance of the above-mentioned circuit breaker products used in DC power systems. By rearranging the installation positions of various functional parts inside the circuit breaker, the space volume occupied by the circuit breaker is effectively reduced, so that more arc-extinguishing grids can be arranged in 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 utility model provides an internal layout structure of a circuit breaker, characterized in that: an operating handle is arranged above the inner cavity of a shell, a rotating shaft is arranged at the right position below the operating handle, a 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, a trip button and a lock button are arranged on the rotating shaft, both sides of the double-breakpoint moving contact system are located in the shell space below the rotating shaft, and an arc-strike structure group and an arc-extinguishing chamber group are arranged in sequence up and down, a double-breakpoint static contact system corresponds to the double-breakpoint moving contact system, a 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 a magnetic tripping system is installed, and a side of the shell where the rotating shaft is installed, located on the outside of the left arc-extinguishing chamber in the arc-extinguishing chamber group, and a thermal tripping system is installed.

[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 of the embodiments, 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 of the embodiments, a breaking acceleration spring is connected to the bottom of the double-breakpoint moving contact system.

[0011] In one of the embodiments, 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 tripping system extends to the bottom position above the double-break moving contact system and is linked to a tripping rod extending from the lock.

[0013] In one of the embodiments, the left arc extinguishing chamber and / or the right arc extinguishing chamber in the arc extinguishing chamber group are horizontally or obliquely arranged 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 a are disconnected.

[0014] In one embodiment, the arc inlets of the left arc extinguishing chamber and the right arc extinguishing chamber correspond to the arc outlets of the corresponding arc striking channels respectively, 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 utility model provides an internal layout structure of a circuit breaker, wherein the operating handle is arranged above the inner cavity of the shell, the rotating shaft is arranged at the right position below the operating handle, the double-breakpoint moving contact system is arranged at the position directly below the operating handle and can move in the shell space on the left side of the rotating shaft, the trip button and the lock button are arranged on the rotating shaft, the two sides of the double-breakpoint moving contact system are located in the shell space below the rotating shaft, and the arc-strike structure group and the arc-extinguishing chamber group are arranged in sequence up and down, 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. By 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, and the breaking capacity of the circuit breaker is improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Attached Figure 1 It is a structural schematic diagram of the circuit breaker in the open state in Example 1 of the utility model.

[0019] Attached Figure 2 It is a structural schematic diagram of the circuit breaker in the closed state in Example 1 of the utility model.

[0020] Attached Figure 3 It is a front view of the double-breakpoint moving contact system in Example 1 of the utility model.

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

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

[0023] Attached 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 utility model.

[0024] Attached Figure 7 This is a schematic diagram of the position relationship between the arc striking structure group and the double breakpoint static contact system in Example 1 of the utility model. Figure 1 .

[0025] Attached Figure 8 This is a schematic diagram of the position relationship between the arc striking structure group and the double breakpoint static contact system in Example 1 of the utility model. Figure 2 .

[0026] Attached Fig. 9 This is a schematic diagram of the installation of the arc extinguishing chamber group in Example 2 of the utility model. DETAILED DESCRIPTION

[0027] 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.

[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 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Example 1

[0033] In the prior art, the rotary double-breakpoint circuit breaker used in the DC power system is relatively large in size, and it is difficult to arrange more arc-extinguishing grids, which results 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, wherein the operating handle 1 is arranged above the inner cavity of the housing 2, and the operating end of the operating handle 1 extends out of the housing 2. The rotating shaft 3 is arranged at the right position below the operating handle 1, and the double-breakpoint moving contact system a is arranged directly below the operating handle 1 (directly below does not mean that the center is on the same straight line, as long as it is in the vertical direction up and down) and can move in the housing 2 space on the left side of the rotating shaft 3. The trip button 4 and the lock button 5 are arranged on the rotating shaft 3. The two sides of the double-breakpoint moving contact system a are located in the housing 2 space below the rotating shaft 3 and are sequentially arranged up and down. 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 on the outside of 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 where the rotating shaft 3 is installed is located on the outside of the left arc extinguishing chamber 702 in the arc extinguishing chamber group 7 and is equipped with a thermal tripping system 9. 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. The bimetallic strip 901 is connected to the static contacts b01, b01' in the double-breakpoint static contact system b through a soft connection to form a loop. A corresponding side of the double-breakpoint static contact system b is provided with an avoidance gap to avoid the bimetallic strip 901. A right terminal 10 is installed in the housing 2 on the outside of the magnetic tripping system 8. A disconnection acceleration spring a6 is connected to the bottom of the double-breakpoint moving contact system a.

[0035] In the above layout structure, the housing 2 is preferably convex to ensure the minimum volume of the circuit breaker. The double-breakpoint circuit breaker according to the above internal layout achieves the purpose of increasing the number of arc extinguishing grids. Next, in conjunction with the accompanying drawings, the function and structure of the contact system and arc extinguishing chamber in this layout structure are further described.

[0036] As attached Figure 3 , 4, 5 and 6, in this embodiment, the double-breakpoint moving contact system a includes a contact seat a1, and the left moving contact a2 and the right moving contact a3 are rotatably mounted on both sides of the contact seat a1, and the left moving contact a2 and the right moving contact a3 are connected by a soft connection a8. In this embodiment, 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 through contact shafts a7, 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 seat a1, the outer surface of the contact portion of the left moving contact a2 and the right moving contact a3 is equipped with insulating parts a5, a5', and the two ends of the pressure spring a4 respectively press 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. At the same time, 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. The left moving contact a2 and the right moving contact a3 are limited in rotation stroke by the moving contact installation grooves a101, a101'. In this embodiment, in order to ensure smooth and convenient movement, the contact seat 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. A switch-off acceleration spring a6 is connected to the bottom of the contact base a1. Figure 1 As shown, the opening acceleration spring a6 is arranged in the 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. One end is connected to the contact seat a1, and the other end is fixedly mounted on the bottom of the spring installation groove 201 on the housing 2. The left arc extinguishing chamber 702 and the right arc extinguishing chamber 701 are separated by the spring installation groove 201 on the housing 2. The opening acceleration spring a6 provides a downward pulling force to the contact seat a1, so that it has a tendency to move downward.

[0038] In a circuit breaker with a dual breakpoint function, the arc extinguishing capability is required to be high, so the breaking arc needs to be quickly introduced into the arc extinguishing chamber for extinguishing. Therefore, in this embodiment, 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, b01' in the double-breakpoint static contact system b include arc-striking parts b01a, b01a', the tails of the arc-striking parts b01a, b01a' are connected to the static arc-striking plates b01d, b01d' bent downwards, the fronts of the arc-striking parts b01a, b01a' extend out contact parts b01b, b01b' bent upwards, and the contact parts b01b, b01b' are provided with static silver points b01 c, b01 c'. The arc-striking parts b01 a, b01 a', the static arc-striking plates b01 d, b01d' and the contact parts b01 b, b01 b' are installed together or in an integrated manner. In this embodiment, the arc-striking parts b01 a, b01 a', the static arc-striking plates b01 d, b01 d' and the contact parts b01 b, b01 b' 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 side 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 with the protruding contact parts a201, a301 provided on the left moving contact a2 and the right moving contact a3 in the contact seat a1 that moves up and down, and can also match with the position of the arc striking structure group 6 to facilitate the breaking of the arc and the rapid entry into 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-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. 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, respectively, 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-breakpoint moving contact system a and the corresponding static contacts b01, b01' in the double-breakpoint 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 Fig. 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 utility model provides an internal layout structure of a circuit breaker, in which the upper connecting rod, the jumper and the lock can drive the rotating shaft to rotate 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 to achieve 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. At the same time, it should be noted that the contact system and the arc-extinguishing chamber in the layout structure are described in detail in the embodiment of the utility model, which does not mean that the layout structure claimed to be protected by the utility model 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 utility model should be deemed to fall within the protection scope of the claims of the utility model.

[0045] 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.

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

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 inside the housing (2) and 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 switch-off 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 a 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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