A residual current protection device installation assembly for a molded case circuit breaker

Abstract

The utility model relates to a mounting assembly for a residual current protection device of a molded case circuit breaker, comprising a base frame and a shell; the base frame comprises a front bracket and a plurality of rear partitions arranged in parallel; a mounting column is provided on the front bracket, and a mounting slot is provided on the mounting column; a partition is provided in the shell, a rectangular through slot is provided at the bottom of the partition, an electronic component mounting slot is provided at the top, and an undercut is provided at the edge of the electronic component mounting slot; the rectangular through slot is snapped with the top of the zero-sequence current transformer; the electronic component is snapped in the electronic component mounting slot through the undercut; a mounting boss is provided at the bottom of the shell; the mounting boss is snapped with the mounting slot, and then the zero-sequence current transformer is clamped and installed from the upper and lower sides. Compared with the prior art, the utility model can enable the electronic component to be reliably fixed above the conductive sheet of the tripping assembly and maintain a certain distance, thereby reducing the influence of the heating phenomenon of the conductive sheet on the electronic part of the circuit in the residual current protection device.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to an installation assembly for a residual current protection device of a molded case circuit breaker. Background Art

[0002] The thermal-magnetic residual current protection device components used in molded case circuit breakers currently on the market require a large number of parts and standard parts for installation and fixation of various parts inside the components, and the structure is relatively complex, which increases manual steps, increases the difficulty of installation, and limits the size of the circuit breaker. The effect is not ideal in terms of cost and assembly convenience. Utility Model Content

[0003] The utility model aims to provide a residual current protection device installation assembly for a molded case circuit breaker which has a simple and compact structure and is easy to assemble and disassemble.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A mounting assembly for a residual current protection device of a molded case circuit breaker, used for mounting a trip assembly, a zero-sequence current transformer, and an electronic assembly of a fixed circuit breaker, wherein the trip assembly comprises a plurality of groups of trippers, conductive sheets, and connecting plates connected in sequence; the connecting plates and the trippers are respectively located at the front and rear sides of the zero-sequence current transformer, and the conductive sheets pass through the zero-sequence current transformer to connect the connecting plates and the trippers; wherein the mounting assembly comprises a base frame and a housing;

[0006] The base frame includes a front bracket and a plurality of rear partitions arranged in parallel on the rear side of the front bracket; the front bracket extends horizontally and is used to carry the zero-sequence current transformer; the rear partition extends vertically and is used to separate and install the release; the front bracket is provided with a mounting column, and the mounting column is provided with a mounting groove;

[0007] The shell is provided with a partition, the bottom of the partition is provided with a rectangular through slot, the top is provided with an electronic component installation slot, and the edge of the electronic component installation slot is provided with an undercut; the rectangular through slot is snap-fitted with the top of the zero-sequence current transformer; the electronic component is snap-fitted in the electronic component installation slot through the undercut; the bottom of the shell is provided with a mounting boss;

[0008] The mounting boss is engaged with the mounting groove, thereby clamping and mounting the zero-sequence current transformer from the upper and lower sides.

[0009] Furthermore, a pair of mounting posts are arranged in parallel on the front bracket, and are respectively provided with a first mounting groove and a second mounting groove; a first mounting boss and a second mounting boss are respectively provided on the bottom of the shell;

[0010] The first mounting groove is clamped with the first mounting boss, and the second mounting groove is clamped with the second mounting boss.

[0011] Furthermore, the mounting boss is a cuboid boss, and correspondingly, the mounting groove is a rectangular mounting groove.

[0012] Furthermore, the cross-section of the mounting column is rectangular.

[0013] Furthermore, a wire through hole is provided at the bottom of the partition, and the wires of the electronic components pass through the wire through hole.

[0014] Further, the electronic assembly includes an electronic circuit board and an actuator;

[0015] A clearance hole is formed on the side wall of the electronic component installation slot, the electronic circuit board is arranged in the electronic component installation slot and is fixed by being buckled upside down, and the actuator passes through the clearance hole.

[0016] Furthermore, a plurality of longitudinal ridges are arranged at intervals on the bottom of the front bracket, and the bottom of the zero-sequence current transformer is in contact with the plurality of ridges.

[0017] Furthermore, the trip assembly includes an A-phase tripper, an A-phase conductive sheet, and an A-phase connecting plate connected in sequence, a B-phase tripper, a B-phase conductive sheet, and a B-phase connecting plate connected in sequence, a C-phase tripper, a C-phase conductive sheet, and a C-phase connecting plate connected in sequence, and an N-phase tripper, an N-phase conductive sheet, and an N-phase connecting plate connected in sequence.

[0018] Furthermore, a plurality of conductive sheets pass through the central hole of the zero-sequence current transformer.

[0019] Furthermore, the base is arranged on a base of the circuit breaker.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1) The utility model fixes the zero-sequence current transformer by means of a base frame and a housing that are butted up and down, and uses the upper housing as a mounting frame for the electronic components, so that the electronic components can be reliably fixed above the conductive sheet of the trip assembly and maintained at a certain distance, thereby reducing the effect of the heating of the conductive sheet on the electronic part of the circuit in the residual current protection device, and ensuring the use effect and service life of the entire residual current protection device. Ensure that when the circuit has the selected action residual current value designed by the residual current protection device, the residual current protection device can reliably cut off the fault circuit;

[0022] 2) The utility model further fixes the base frame by providing a rectangular groove at the bottom of the housing that is adapted to the top of the zero-sequence current transformer, thereby avoiding the problem of the base frame tilting due to the center of gravity shift at the top of the base frame, thereby affecting the installation stability of the device;

[0023] 3) The components of the utility model have a simple and compact structure and are easy to assemble and disassemble. The space utilization rate can be maximized in a limited space through the mutual cooperation between the components. In addition, the fixation of the various components in the installation assembly can be completed without providing additional standard parts, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the installation structure of a molded case circuit breaker residual current protection device installation component on a base according to the utility model;

[0025] Figure 2 It is a structural schematic diagram of an installation assembly of a residual current protection device of a molded case circuit breaker of the utility model;

[0026] Figure 3 It is a schematic diagram of the coordination structure of the trip assembly, the zero-sequence current transformer and the base frame;

[0027] Figure 4 It is a schematic diagram of the assembly structure of the housing and the electronic components;

[0028] Figure 5 It is a schematic diagram of the matching structure of the electronic circuit board and the housing;

[0029] Figure 6 It is a schematic diagram of the assembly structure of the base frame and the shell;

[0030] Figure 7 It is a schematic diagram of the coordination structure between the housing and the zero-sequence current transformer;

[0031] Figure 8 It is a schematic diagram of the assembly structure of the top and shell of the zero-sequence current transformer;

[0032] Fig. 9 is a schematic diagram of the structure of the base frame;

[0033] Fig.10 It is a schematic diagram of the main structure of the shell;

[0034] Fig.11 It is a schematic diagram of the shell structure from a top view;

[0035] Description of the markings in the figure:

[0036] 1-base, 2-electronic component, 21-electronic circuit board, 22-actuator, 3-zero-sequence current transformer, 4-tripping component, 41-A phase conductive sheet, 42-B phase conductive sheet, 43-C phase conductive sheet, 44-N phase conductive sheet, 5-base frame, 51-first mounting groove, 52-second mounting groove, 53-front bracket, 54-rear partition, 6-housing, 61-first mounting boss, 62-second mounting boss, 63-rectangular through groove, 631-first inner ring surface, 632-second inner ring surface, 633-third inner ring surface, 634-fourth inner ring surface, 64-wire through hole, 65-undercut, 66-upper surface. DETAILED DESCRIPTION

[0037] The following embodiments are implemented based on the above technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following embodiments.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0040] Example:

[0041] like Figure 1 The molded case circuit breaker residual current protection device installation assembly shown is used to provide installation support for the residual current protection device in the molded case circuit breaker. The molded case circuit breaker includes a trip assembly 4, a zero-sequence current transformer 3, and an electronic assembly 2. The trip assembly 4 includes multiple groups of trippers, conductive sheets, and connecting plates connected in sequence; the connecting plate and the tripper are respectively located on the front and rear sides of the zero-sequence current transformer 3, and the conductive sheet passes through the zero-sequence current transformer 3 to connect the connecting plate and the tripper. Figure 2 As shown, the installation assembly includes a base frame 5 and a shell 6; Figure 3 and Figure 6 As shown, the base frame 5 includes a front bracket 53 and a plurality of rear partitions 54 arranged in parallel at the rear side of the front bracket 53; the front bracket 53 extends horizontally to carry the zero-sequence current transformer 3; the rear partition 54 extends vertically to separate and install the release; the front bracket 53 is provided with a mounting column, and the mounting column is provided with a mounting groove; a partition is provided in the housing 6, a rectangular through groove 63 is provided at the bottom of the partition, an electronic component mounting groove is provided at the top, and an undercut 65 is provided at the edge of the electronic component mounting groove; as shown Figure 7 , Figure 8As shown, the rectangular through slot 63 is engaged with the top of the zero-sequence current transformer 3; the electronic component 2 is engaged in the electronic component mounting slot through the undercut 65; a mounting boss is provided at the bottom of the shell 6; the mounting boss is engaged with the mounting slot, and then the zero-sequence current transformer 3 is clamped and installed from the upper and lower sides.

[0042] The utility model fixes the zero-sequence current transformer by means of the upper and lower butted base frame 5 and housing 6, and uses the upper housing 6 as a mounting frame for the electronic components, so that the electronic components in the residual current protection device can be reliably fixed at a certain distance above the conductive sheet, reducing the influence of the heating phenomenon of the conductive sheet on the electronic part of the circuit in the residual current protection device, ensuring the use effect and service life of the entire residual current protection device. It is ensured that when the circuit has the selected action residual current value designed by the residual current protection device, the residual current protection device can reliably cut off the fault circuit.

[0043] In this embodiment, Fig. 9 As shown, a pair of mounting posts are arranged side by side on the front bracket, and are respectively provided with a first mounting groove 51 and a second mounting groove 52; Fig.10 As shown, the bottom of the housing 6 is provided with a first mounting boss 61 and a second mounting boss 62; Figure 6 As shown, the first mounting groove 51 is engaged with the first mounting boss 61, and the second mounting groove 52 is engaged with the second mounting boss 62. Specifically, the mounting boss is a rectangular parallelepiped boss, and correspondingly, the mounting groove is a rectangular mounting groove. The cross section of the mounting column is rectangular.

[0044] In this embodiment, a wire through hole 64 is provided at the bottom of the partition layer, and the wires of the electronic component 2 pass through the wire through hole 64 .

[0045] In this embodiment, Figure 4 , Figure 5 As shown, the electronic component 2, exemplarily, is a residual current release, including an electronic circuit board 21 and an actuator 22. The electronic circuit board 21 receives the residual current detection signal of the zero-sequence current transformer 3, determines whether the residual current reaches the set value, and then drives the actuator 22 (i.e., the electromagnetic mechanism device) to trip the circuit breaker and cut off the fault circuit; a clearance hole is opened on the side wall of the electronic component installation slot, the electronic circuit board 21 is arranged in the electronic component installation slot, and is fixed by the inverted buckle 65, and the actuator 22 passes through the clearance hole.

[0046] In this embodiment, a plurality of longitudinal ridges are arranged at intervals at the bottom of the front bracket 53, and the bottom of the zero-sequence current transformer 3 is in contact with the plurality of ridges.

[0047] In this embodiment, the trip assembly 4 includes an A-phase tripper, an A-phase conductive sheet 41, and an A-phase connecting plate connected in sequence, a B-phase tripper, a B-phase conductive sheet 42, and a B-phase connecting plate connected in sequence, a C-phase tripper, a C-phase conductive sheet 43, and a C-phase connecting plate connected in sequence, and an N-phase tripper, an N-phase conductive sheet 44, and an N-phase connecting plate connected in sequence.

[0048] In this embodiment, a plurality of conductive sheets pass through the central hole of the zero-sequence current transformer 3 .

[0049] In this embodiment, the base frame 5 is arranged on the base 1 of the circuit breaker.

[0050] More specifically, the trip assembly 4 is arranged in an orderly manner in the annular space of the zero-sequence current transformer 3, so that the zero-sequence current transformer 3 detects the residual current electrical signal in the circuit. The trip assembly 4 is installed in the base frame 5, and the base frame 5 fixes the components of the trip assembly 4 and indirectly limits the movement of the zero-sequence current transformer 3. The housing 6 is installed above the base frame 5, and the zero-sequence current transformer 3 can be embedded in the housing 6 cavity through the rectangular through slot 63 in the housing 6, and the rectangular through slot opening at the lower end of the housing 6 is closed, providing installation support for the middle of the housing 6, and isolating the A-phase conductive sheet 41, the B-phase conductive sheet 42, the C-phase conductive sheet 43, and the N-phase conductive sheet 44 of the trip assembly 4 from the electronic circuit board 21 in the electronic component 2 in the vertical space. Through the undercut 65 on the housing 6, the electronic circuit board 21 can be confined in the housing 6, so that the entire electronic component 2 is always located above the trip assembly 4. The entire combined structure is installed on the base 1, and the zero-sequence current transformer 3 and the electronic component 2 are connected to realize signal transmission, drive the actuator 22 of the electronic component 2 to operate, and achieve the residual current protection function.

[0051] Working principle:

[0052] The A-phase conductive sheet 41, the B-phase conductive sheet 42, the C-phase conductive sheet 43, and the N-phase conductive sheet 44 in the trip assembly 4 sequentially pass through the annular space of the zero-sequence current transformer 3, so that the zero-sequence current transformer 3 can detect the residual current electrical signal in the circuit. The trip assembly 4 and the zero-sequence current transformer 3 form a whole, and the whole is installed on the base frame 5. The A-phase conductive sheet 41, the B-phase conductive sheet 42, the C-phase conductive sheet 43, and the N-phase conductive sheet 44 of the trip assembly 4 are arranged in order to limit the free movement of the trip assembly 4 and the zero-sequence current transformer 3, and to avoid mutual interference between the various parts of the trip assembly 4 and short circuit. The symmetrical first mounting boss 61 and the second mounting boss 62 on the housing 6 are embedded in the symmetrically arranged first mounting groove 51 and the second mounting groove 52 on the base frame 5, and the lower surfaces of the first mounting boss 61 and the second mounting boss 62 are in contact with the upper surfaces of the first mounting groove 51 and the second mounting groove 52, providing installation support for the housing 6 on both sides. At the same time, the rectangular through slot 63 in the middle of the shell 6 can be inserted into the zero-sequence current transformer 3, so that a part of the zero-sequence current transformer 3 can be embedded in the cavity of the shell 6 and always close to the first inner ring surface 631, the second inner ring surface 632, the third inner ring surface 633, and the fourth inner ring surface 634 of the rectangular through slot 63 of the shell 6. Figure 8 As shown. Support and limit are provided for the shell 6 in the middle, so as to reduce the risk of the shell 6 tipping over due to the displacement of the center of gravity caused by the actuator 22 on the electronic component 2 being located outside the shell 6 after the electronic component 2 is installed in the shell 6, and increase the stability of the overall installation assembly. At the same time, the wire through hole 64 on the shell 6 can provide a wire connection path for the terminal of the electronic circuit board 21, and provide the maximum layout space for the electronic circuit board 21. With the help of the undercut 65 on the shell 6, the lower surface of the electronic circuit board 21 on the electronic component 2 is always attached to the upper surface 66 of the shell 6 cavity, so as to ensure that the electronic circuit board always maintains a certain distance from the conductive sheet in the vertical space. The entire residual current protection device installation assembly is installed on the base 1, and the zero-sequence current transformer 3 and the electronic component 2 are connected by wires, and the residual current electrical signal obtained by the zero-sequence current transformer 3 is converted into an action signal of the actuator 22 on the electronic component 2, so as to cut off the fault circuit and achieve the purpose of residual current protection.

[0053] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A molded case circuit breaker residual current protection device installation assembly, used for installing a trip assembly (4), a zero-sequence current transformer (3), and an electronic assembly (2) of a fixed circuit breaker, wherein the trip assembly (4) comprises a plurality of groups of trip devices, conductive sheets, and connecting plates connected in sequence; the connecting plates and the trip devices are respectively located at the front and rear sides of the zero-sequence current transformer (3), and the conductive sheets pass through the zero-sequence current transformer (3) to connect the connecting plates and the trip devices; characterized in that: The mounting assembly comprises a base frame (5) and a housing (6); The base frame (5) comprises a front bracket (53) and a plurality of rear partitions (54) arranged in parallel on the rear side of the front bracket (53); the front bracket (53) extends horizontally and is used to carry the zero-sequence current transformer (3); the rear partitions (54) extend vertically and are used to separate and install the release; a mounting column is provided on the front bracket (53), and a mounting groove is opened on the mounting column; The housing (6) is provided with a partition layer, the bottom of the partition layer is provided with a rectangular through slot (63), the top is provided with an electronic component installation slot, and the edge of the electronic component installation slot is provided with an undercut (65); the rectangular through slot (63) is snap-fitted with the top of the zero-sequence current transformer (3); the electronic component (2) is snap-fitted into the electronic component installation slot through the undercut (65); the bottom of the housing (6) is provided with a mounting boss; The mounting boss is engaged with the mounting groove, thereby clamping and mounting the zero-sequence current transformer (3) from the upper and lower sides.

2. The residual current protection device installation assembly for molded case circuit breaker according to claim 1, characterized in that: A pair of mounting columns are arranged in parallel on the front bracket, and are respectively provided with a first mounting groove (51) and a second mounting groove (52); a first mounting boss (61) and a second mounting boss (62) are respectively provided on the bottom of the shell (6); The first mounting groove (51) is snap-fitted with the first mounting boss (61), and the second mounting groove (52) is snap-fitted with the second mounting boss (62).

3. The residual current protection device installation assembly for molded case circuit breaker according to claim 1, characterized in that: The mounting boss is a cuboid boss, and correspondingly, the mounting groove is a rectangular mounting groove.

4. The residual current protection device installation assembly for molded case circuit breaker according to claim 3, characterized in that: The cross section of the mounting column is rectangular.

5. The residual current protection device installation assembly for molded case circuit breaker according to claim 1, characterized in that: A wire through hole (64) is provided at the bottom of the partition layer, and the wires of the electronic components (2) pass through the wire through hole (64).

6. The residual current protection device installation assembly for molded case circuit breaker according to claim 1, characterized in that: The electronic component (2) comprises an electronic circuit board (21) and an actuator (22); A clearance hole is provided on the side wall of the electronic component installation slot, the electronic circuit board (21) is arranged in the electronic component installation slot and fixed by an inverted buckle (65), and the actuator (22) passes through the clearance hole.

7. The residual current protection device installation assembly for molded case circuit breaker according to claim 1, characterized in that: The bottom of the front bracket (53) is provided with a plurality of longitudinal ridges at intervals, and the bottom of the zero-sequence current transformer (3) is in contact with the plurality of ridges.

8. The residual current protection device installation assembly for molded case circuit breaker according to claim 1, characterized in that: The trip assembly (4) comprises an A-phase tripper, an A-phase conductive sheet (41), and an A-phase connecting plate connected in sequence, a B-phase tripper, a B-phase conductive sheet (42), and a B-phase connecting plate connected in sequence, a C-phase tripper, a C-phase conductive sheet (43), and a C-phase connecting plate connected in sequence, and an N-phase tripper, an N-phase conductive sheet (44), and an N-phase connecting plate connected in sequence.

9. The residual current protection device installation assembly for molded case circuit breaker according to claim 1, characterized in that: A plurality of conductive sheets pass through the central hole of the zero-sequence current transformer (3).

10. The residual current protection device installation assembly for molded case circuit breaker according to claim 1, characterized in that: The base frame (5) is arranged on the base (1) of the circuit breaker.

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