Zero sequence mutual inductor installation structure of miniature circuit breaker

Abstract

The utility model discloses a zero sequence mutual inductor installation structure of a miniature circuit breaker, which comprises a main control module and a breaking module, and is characterized in that the main control module is internally provided with a main control PCB; the breaking module is arranged on one side of the main control module; the system also comprises a zero-sequence mutual inductor, and the zero-sequence mutual inductor is disposed in the breaking module. A first connector is arranged at one end of the zero sequence mutual inductor, a second connector is arranged on the main control PCB, and the first connector is connected with the second connector in an inserted mode, so that the zero sequence mutual inductor is electrically connected with the main control PCB; the device has the advantage of being stable in structure.

Description

TECHNICAL FIELD

[0001] The application relates to the field of low-voltage electrical apparatuses, and particularly relates to a zero sequence transformer mounting structure of a small circuit breaker. BACKGROUND

[0002] Small circuit breakers with leakage protection functions are not uncommon, and the existing circuit breakers of this type basically rely on zero sequence transformers for sampling. With the continuous development of printed circuit board technology, leakage protection circuits often rely on circuit boards. The existing zero sequence transformers basically rely on the form of soft wire connection for electrical connection with the circuit board. Such a structure not only leads to troublesome installation, but also causes unstable installation of the zero sequence transformer.

[0003] The structure disclosed in CN114171352A is just such a structure.

[0004] Therefore, how to improve the connection mode between the zero sequence transformer and the circuit board of the leakage protection module has become a problem worth considering. SUMMARY

[0005] Therefore, the application aims to overcome the deficiencies in the prior art and provides a zero sequence transformer mounting structure of a small circuit breaker.

[0006] The application provides a zero sequence transformer mounting structure of a small circuit breaker, which comprises a master control module and a breaking module, the master control module has a master control PCB inside; the breaking module is arranged on one side of the master control module; wherein, a zero sequence transformer is further included, and the zero sequence transformer is arranged inside the breaking module; one end of the zero sequence transformer is provided with a first coupler, a second coupler is arranged on the master control PCB, and the first coupler and the second coupler are inserted to form electrical connection between the zero sequence transformer and the master control PCB.

[0007] In some embodiments of the application, the master control module comprises a master control shell, and the master control PCB is arranged inside the master control shell; a through hole is formed in the master control shell for the first coupler to pass through, and a separation rib is arranged on the inner wall of the master control shell and surrounds the through hole, and the first coupler is at least partially surrounded by the separation rib.

[0008] In some embodiments of the application, the zero sequence transformer comprises an outer cover and a magnetic ring, and the magnetic ring is arranged in the outer cover; the first coupler is at least partially protruded from one end of the outer cover, and the outer cover and the inside of the breaking module form a removable form of fixed connection, and the removable form of fixed connection is screw fastening or buckle fixing or plug-in fixing.

[0009] In some embodiments of the application, a groove is arranged on the outer cover, and a reverse buckle is arranged in the inside of the breaking module, and the reverse buckle and the groove form a removable form of fixed connection.

[0010] In some embodiments of the present application, the groove and the first coupler are arranged on opposite sides of the zero sequence transformer, and the center hole is located between the groove and the first coupler.

[0011] In some embodiments of the present application, a protrusion is arranged on the surface of the outer cover, and the groove is formed at the joint of the protrusion and the surface of the outer cover.

[0012] In some embodiments of the present application, the inside of the breaking module is further provided with two sets of limiting ribs, which are located near the undercut; in three dimensions of the three-dimensional space, the undercut and the groove limit the zero sequence transformer in two dimensions, and the two sets of limiting ribs limit at least the third dimension.

[0013] In some embodiments of the present application, the inside of the breaking module is further provided with a resisting rib, which is located near the undercut; the resisting rib is provided with a groove I and a groove II, the groove I is matched with part of the outer surface of the outer cover; the groove II is matched with part of the outer surface of the protrusion, and after the undercut is buckled into the groove, the protrusion is clamped between the resisting rib and the undercut.

[0014] In some embodiments of the present application, the breaking module comprises at least two breaking units assembled in sequence, each breaking unit has a shell, and the undercut is integrally formed on the shell farthest from the master control module.

[0015] In some embodiments of the present application, the breaking module comprises at least three breaking units assembled in sequence, each breaking unit has a shell; further comprising a mounting block, the undercut is arranged on the mounting block, and the mounting block is clamped and fixed between the shells of any two adjacent breaking units except the breaking unit closest to the master control module, or the mounting block is fixed on the shell of any one of the other breaking units except the breaking unit closest to the master control module.

[0016] In some embodiments of the present application, an assembly opening is arranged on the breaking unit closest to the master control module, and the zero sequence transformer is assembled into the inside of the breaking module through the assembly opening; a guide I located in the inside of the assembly opening is arranged on the breaking unit closest to the master control module, a guide II is arranged on the outer cover, and the guide I and the guide II are matched to ensure that the undercut is aligned with the groove.

[0017] The beneficial effects of the present application compared with the prior art are as follows:

[0018] The present application is different from the prior art, and the first coupler is arranged directly on the zero sequence transformer, and is matched with the second coupler of the master control PCB to realize electrical connection and mechanical structure fixation, so that the installation of the zero sequence transformer is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 A schematic diagram of the zero sequence transformer and the main control PCB in the 2-pole scheme of the embodiment of the present application is shown.

[0021] Figure 2 A schematic diagram of the zero sequence transformer and the main control housing in the embodiment of the present application is shown.

[0022] Figure 3 A schematic diagram of the 2-pole scheme of the embodiment of the present application is shown.

[0023] Figure 4 A schematic diagram of the installation of the breaking module and the main control module in the 2-pole scheme of the embodiment of the present application is shown.

[0024] Figure 5 A schematic diagram of the installation of the zero sequence transformer and the breaking module in the 2-pole scheme of the embodiment of the present application is shown.

[0025] Figure 6 A perspective view of the breaking module in the 2-pole scheme of the embodiment of the present application is shown.

[0026] Figure 7 A schematic diagram of the zero sequence transformer in the embodiment of the present application is shown.

[0027] Figure 8 A perspective view of the 4-pole scheme of the embodiment of the present application is shown.

[0028] Figure 9 A schematic diagram of the zero sequence transformer and the main control PCB in the 4-pole scheme of the embodiment of the present application is shown.

[0029] Figure 10 A perspective view of the breaking module in the 4-pole scheme of the embodiment of the present application is shown.

[0030] Figure 11 A schematic diagram of the mounting block in the 4-pole scheme of the embodiment of the present application is shown.

[0031] Figure 12 A schematic diagram of the installation of the zero sequence transformer and the mounting block in the 4-pole scheme of the embodiment of the present application is shown.

[0032] Figure 13 A schematic diagram of the installation of the mounting block in the 4-pole scheme of the embodiment of the present application is shown. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described below in detail with reference to examples shown in the drawings, wherein the same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below are exemplary only, and are merely intended to explain the present application, and are not to be understood as limiting the present application.

[0034] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature. Embodiments

[0038] AsFigures 1-13 As shown, the embodiment of the present application is a miniature circuit breaker, and its zero sequence transformer mounting structure is as follows.

[0039] It comprises a master control module 100 and a breaking module 400.

[0040] Here, the master control module 100 is arranged on one side of the breaking module 400, specifically on one side in the width direction F2 of the circuit breaker. The master control module 100 comprises a master control housing 101 and a master control PCB 102. The master control PCB 102 is arranged inside the master control housing 101, and the master control PCB 102 here comprises a leakage protection circuit, and the zero sequence transformer 200 is a sampling element of the leakage protection circuit. Since the leakage protection circuit itself is a conventional means, it will not be described in detail here.

[0041] The breaking module 400 comprises at least two breaking units 410 (each breaking unit is equivalent to a pole circuit breaker unit, and comprises a moving contact, a stationary contact, an operating mechanism and the like), but not more than four. The breaking units 410 are arranged in sequence, one pole of which is closest to the master control module 100 (also called the first breaking unit 410a), and one pole of which is farthest from the master control module 100 (also called the tail breaking unit 410d). When there are three-pole breaking units 410, the breaking unit 410 in the middle is the second breaking unit 410b. When there are four-pole breaking units 410, the breaking units 410 in the middle are the second breaking unit 410b and the third breaking unit 410c in sequence.

[0042] Regardless of the number of poles of the breaking unit 410, one end of the zero sequence transformer 200 is fixed with the master control module 100. Specifically, the first connector 210 is arranged at one end of the zero sequence transformer 200, and the second connector 1020 is arranged on the master control PCB 102, and the first connector 210 and the second connector 1020 are inserted to form an electrical connection between the zero sequence transformer 200 and the master control PCB 102. In this way, the fixing is realized through the connector, which not only ensures the mechanical structure level fixing, but also realizes the electrical connection, and ensures the stable installation of the zero sequence transformer 200.

[0043] Of course, the first connector 210 and the second connector 1020 here are a pair of relative concepts. When the first connector 210 is a plug, the second connector 1020 is a socket; conversely, when the first connector 210 is a socket, the second connector 1020 is a plug.

[0044] For the main control shell 101, a through hole 1010 is arranged on the inner wall of the main control shell 101, so that the first connector 210 can penetrate into the inside of the main control module 100 and cooperate with the second connector 1020. The main control shell 101 has an isolation rib 1011 arranged around the through hole 1010, so that the first connector 210 is at least partially surrounded by the isolation rib 1011 (but does not affect the cooperation of the first connector 210 with the second connector 1020), which can ensure the stability of the insertion of the first connector 210 with the second connector 1020, and also improve the insulation performance to a certain extent.

[0045] For the zero sequence transformer 200, it includes an outer cover 220 and a magnetic ring 230 arranged in the outer cover 220. The first connector 210 at least partially protrudes from one end of the outer cover 220, and the protrusion is also for penetrating into the through hole 1010 and cooperating with the second connector 1020.

[0046] Most of the structure of the outer cover 220 is inside the disconnection module 400, and forms a removable form of fixed connection with the inside of the disconnection module 400. In this way, both ends of the zero sequence transformer 200 have a fixed structure, which ensures the stability of the installation of the zero sequence transformer 200.

[0047] There are many ways to form a removable form of fixed connection, for example, screw fastening, buckle fixing, plug-in fixing, etc.

[0048] Screw fastening, for example, using screws to fix the outer cover 220 and the shell part of the disconnection module 400.

[0049] Plug-in fixing, for example, also in the form of a similar connector (but without electrical connection), the outer cover 220 is plugged into the shell part of the disconnection module 400.

[0050] Buckle fixing, for example, a reverse buckle 310 is arranged on the outer cover 220, and a groove 240 is arranged on the shell part of the disconnection module 400, and the reverse buckle 310 and the groove 240 form a removable form of fixed connection. Alternatively, a reverse buckle 310 is arranged on the shell part of the disconnection module 400, and a groove 240 is arranged on the outer cover 220.

[0051] No matter which removable form of fixed connection, the installation is more convenient, which is conducive to the rapid assembly of the product, and also makes the stability after installation higher.

[0052] The following takes the example of arranging a reverse buckle 310 on the shell part of the disconnection module 400 and arranging a groove 240 on the outer cover 220.

[0053] The groove 240 and the first coupler 210 are arranged on opposite sides of the zero sequence transformer 200. That is, for the zero sequence transformer 200, from the width direction F2, the end close to the master control module 100 is the adjacent end 200a, and the end away from the master control module 100 is the away end 200b. The first coupler 210 is located on the adjacent end 200a of the zero sequence transformer 200, and the groove 240 is arranged on the away end 200b of the zero sequence transformer 200. The center hole O is located between the adjacent end 200a and the away end 200b, that is, between the groove 240 and the first coupler 210. Such an arrangement fixes the zero sequence transformer 200 from both ends, which helps to improve the installation stability of the zero sequence transformer 200.

[0054] There are many ways to form the groove 240. As a relatively simple way, a protrusion 240a is provided on the outer cover 220, and the groove 240 is formed at the junction of the protrusion 240a and the surface of the outer cover 220. Here, the number of protrusions 240a is two, corresponding to two groups of reverse buckles 310. Such a protrusion 240a structure is relatively simple to form, and is very easy to form a groove 240 with the surface of the outer cover 220, and is conducive to assembly with the reverse buckle 310. For the outer cover 220, a part of its shape is a curved surface structure, and the away end 200b of the zero sequence transformer 200 is part of the curved surface structure, and the protrusion 240a is also on this part of the curved surface structure. As a more preferred way, the surface of the protrusion 240a adopts a curved surface, which is more conducive to the protrusion 240a to open the reverse buckle 310.

[0055] In order to improve the better limiting effect. The above-mentioned reverse buckle 310 and groove 240 cooperate to limit the zero sequence transformer 200 in the height direction F3 and the width direction F2 from the three dimensions of the three-dimensional space (length, width and height). The limiting ribs 320 are arranged on both sides of the reverse buckle 310, that is, a total of two groups of limiting ribs 320. Through the limiting ribs 320, the zero sequence transformer 200 can be limited at least in the length direction F1. Of course, here it is not only limited in the length direction F1, but also limited in the length direction F1 and the height direction F3, as long as it can be limited at least in the length direction F1. Such a limiting structure arrangement will make the stability of the zero sequence transformer 200 better.

[0056] Of course, in addition to the limiting protrusion 320, the abutting protrusion 330 is also included. The abutting protrusion 330 is arranged near the undercut 310, and a groove I 330a is formed on the abutting protrusion 330, which is in conformity with the shape of the distal end 200b of the zero sequence transformer 200, and thus abuts against the distal end 200b of the zero sequence transformer 200. A groove II 330b is also formed on the abutting protrusion 330, which is in conformity with the partial outer surface of the protrusion 240a. After the undercut 310 is buckled into the groove 240, the protrusion 240a is clamped between the groove II 330b and the undercut 310.

[0057] For each pole breaking unit 410, it includes a housing 420, which includes a left half housing 420a and a right half housing 420b.

[0058] Here, the undercut 310, the limiting protrusion 320, and the abutting protrusion 330 can be arranged in various ways with the housing 420.

[0059] For example, as shown in FIG. 4, the two-pole breaking unit 410 is in an integrated structure, and the most distal breaking unit 410 from the main control module 100 is the tail breaking unit 410d. Figures 1-4 The left half housing 420a of the tail breaking unit 410d is provided with a fitting opening 430, and the distal end 200b of the zero sequence transformer 200 passes through the fitting opening 430 and enters the housing 420 of the tail breaking unit 410d. The undercut 310, the limiting protrusion 320, and the abutting protrusion 330 are arranged on the right half housing 420b and correspond to the position of the fitting opening 430. Here, the undercut 310, the limiting protrusion 320, and the abutting protrusion 330 are integrated with the right half housing 420b. This integrated structure is very convenient to process and requires fewer parts. Of course, such a structure can be applied to three-pole and four-pole cases in addition to the two-pole breaking unit 410.

[0060] For example, as shown in FIG. 5, the two-pole breaking unit 410 is in a split structure, and the most distal breaking unit 410 from the main control module 100 is the tail breaking unit 410d. Figures 8-13As shown, the structure of the quadrupole breaking unit 410, the reverse buckle 310, the limiting convex rib 320 and the abutting rib 330 are arranged on the mounting block 300. Here, the mounting block 300 includes a body part 300a and an assembly part 300b around the body part 300a, and the mounting block 300 also has a wire passing hole 340, through which the main line conductor in the breaking unit 410 passes and then passes through the center hole O of the zero sequence transformer 200. In this way, the mounting block 300 is clamped between two adjacent breaking units 410, specifically the second breaking unit 410b and the third breaking unit 410, and the assembly part 300b is clamped by the housings 420 of the two units. Of course, in addition, it can also be clamped between the third breaking unit 410 and the tail breaking unit 410d. Alternatively, instead of clamping and fixing, the mounting block 300 is directly fixed on a housing 420, and the fixing method here has many ways, such as buckling, screwing, riveting, etc. No matter which way it is fixed on a housing 420 or clamped and fixed, as long as it is not related to the first breaking unit 410a.

[0061] This way of mounting block 300, although compared with the integrated structure of the reverse buckle 310, the limiting convex rib 320 and the abutting rib 330, the modification of the housing 420 itself is small, so that the universality of the housing 420 is stronger (because the integrated structure makes the housing 420 can only be used for mounting the zero sequence transformer 200, and cannot be used for other purposes). At the same time, this way of mounting block 300 can also be applied to three-pole circuit breakers in addition to four-pole circuit breakers.

[0062] The assembly opening 430 is arranged on the housing 420 of the first breaking unit 410a, and the assembly opening 430 is used for the zero sequence transformer 200 to pass in. In this way, the zero sequence transformer 200 can be pushed in from the assembly opening 430 (the pushing direction is the width direction F2 direction), and after being pushed in, the reverse buckle 310 is clamped with the groove 240 (if a screw is used for fastening, the screw is installed in place; if a plug-in fit is used, a plug-in fit is formed).

[0063] The guiding part I 440 is arranged on the shell 420 and located at the assembling opening 430. The guiding part II 250 is arranged on the outer cover 220. The guiding part I 440 and the guiding part II 250 form a guiding cooperation, so that the groove 240 of the zero sequence mutual inductor 200 can be aligned with the undercut 310. Here, the guiding part I 440 is a protrusion, and the guiding part II 250 is a groove. Through such a guiding cooperation, it is ensured that the undercut 310 and the groove 240 can be quickly aligned, and the assembly is completed. At the same time, it can make the zero sequence mutual inductor 200 push into the assembling opening 430 until the installation is completed, and it becomes more simple. Of course, it can also have the effect of preventing mistakes (if the two guiding parts are not aligned, the zero sequence mutual inductor 200 will not be assembled). Here, the guiding part I 440 can also be changed to a groove, and the guiding part II 250 can also be changed to a protrusion.

[0064] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A zero sequence transformer installation structure of a miniature circuit breaker, comprising a master control module and a breaking module, the master control module having a master control PCB inside; the breaking module is arranged on one side of the master control module; characterized in that: The zero sequence transformer is provided with a first connector at one end, and a second connector is arranged on the main control PCB, the first connector is inserted into the second connector, so that the zero sequence transformer is electrically connected with the main control PCB.

2. The zero sequence transformer mounting structure for a miniature circuit breaker according to claim 1, characterized by: An isolation rib is arranged on the inner wall of the main control shell and surrounds the through hole, and the first connector is at least partially surrounded by the isolation rib.

3. The zero sequence transformer mounting structure for a miniature circuit breaker according to claim 1, characterized by: The zero sequence transformer comprises an outer cover and a magnetic ring, and the magnetic ring is arranged in the outer cover; the first connector is at least partially protruded from one end of the outer cover, and the outer cover is fixedly connected with the inside of the breaking module in a removable manner, and the removable fixing connection is screw fastening or buckle fixing or plug-in fixing.

4. The zero sequence transformer mounting structure for a miniature circuit breaker according to claim 3, characterized by: A groove is arranged on the outer cover, and a reverse buckle is arranged in the inside of the breaking module, and the reverse buckle is buckle-fixed with the groove.

5. The zero sequence transformer mounting structure for a miniature circuit breaker according to claim 4, characterized by: The groove and the first connector are distributed on opposite sides of the zero sequence transformer, and the center hole is located between the groove and the first connector.

6. The zero sequence transformer mounting structure for a miniature circuit breaker according to claim 4, characterized by: A protrusion is arranged on the surface of the outer cover, and the groove is formed at the joint between the protrusion and the surface of the outer cover.

7. The zero sequence transformer mounting structure for a miniature circuit breaker according to claim 4, characterized by: The inside of the breaking module is further provided with two groups of limiting convex ribs, and the two groups of limiting convex ribs are located near the reverse buckle; in three dimensions of the three-dimensional space, the reverse buckle and the groove limit the zero sequence transformer in two dimensions, and the two groups of limiting convex ribs at least limit the third dimension.

8. The zero sequence transformer mounting structure for a miniature circuit breaker according to claim 6, characterized by: The inside of the breaking module is further provided with a resisting rib, and the resisting rib is located near the reverse buckle; the resisting rib is provided with a groove I and a groove II, the groove I is matched with part of the outer surface of the outer cover; the groove II is matched with part of the outer surface of the protrusion, and after the reverse buckle is buckled into the groove, the protrusion is clamped between the resisting rib and the reverse buckle.

9. The zero sequence transformer mounting structure of a small circuit breaker according to claim 4, characterized in that: The breaking module comprises at least two breaking units which are sequentially assembled, each breaking unit has a shell, and the reverse buckle is integrally formed on the shell which is farthest away from the main control module; Or, the breaking module comprises at least three breaking units which are sequentially assembled, each breaking unit has a shell; further comprising a mounting block, the reverse buckle is arranged on the mounting block, and the mounting block is clamped and fixed between the shells of any two adjacent breaking units except the breaking unit closest to the main control module, or the mounting block is fixed on the shell of any one of the other breaking units except the breaking unit closest to the main control module.

10. The zero sequence transformer mounting structure for a miniature circuit breaker according to claim 9, characterized by: The shell of the breaking unit closest to the main control module is provided with an assembly opening, and the zero sequence transformer is assembled into the inside of the breaking module through the assembly opening; the inside of the assembly opening is provided with a guide piece I, and the outer cover is provided with a guide piece II, the guide piece I is matched with the guide piece II to ensure that the reverse buckle is aligned with the groove.

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