CN107680881B - Circuit breaker and current transformer thereof, and household appliance comprising circuit breaker - Google Patents
Circuit breaker and current transformer thereof, and household appliance comprising circuit breaker Download PDFInfo
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- CN107680881B CN107680881B CN201710855351.4A CN201710855351A CN107680881B CN 107680881 B CN107680881 B CN 107680881B CN 201710855351 A CN201710855351 A CN 201710855351A CN 107680881 B CN107680881 B CN 107680881B
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- current transformer
- mutual inductor
- conductor
- zero sequence
- current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/02—Housings; Casings; Bases; Mountings
- H01H71/0207—Mounting or assembling the different parts of the circuit breaker
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/08—Terminals; Connections
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Abstract
The invention provides a circuit breaker, a current transformer thereof and a household appliance comprising the circuit breaker, wherein the current transformer comprises: the transformer comprises a shell, a zero sequence mutual inductor, a current mutual inductor, a phase conductor and a neutral conductor; the zero sequence mutual inductor and the current mutual inductor are mutually overlapped and accommodated in the shell; the induction part of the phase conductor simultaneously penetrates through the zero sequence mutual inductor and the current mutual inductor, so that the zero sequence mutual inductor and the current mutual inductor share the phase conductor; and the induction part of the neutral conductor penetrates through the zero sequence mutual inductance coil. According to the scheme of the invention, two mutual inductor shells are changed into one, one mutual inductor shell is reduced, the safe space between the current mutual inductor and the zero sequence mutual inductor shell on the PCB is saved, and the occupied area of the mutual inductor on the PCB is reduced by more than half.
Description
Technical Field
The invention relates to the technical field of circuit protection, in particular to a circuit breaker, a current transformer of the circuit breaker and a household appliance comprising the circuit breaker.
Background
Arc faults, which are mainly caused by insulation damage aging or joint loosening in electrical devices and equipment connected thereto, are common safety hazards in electrical lines. An Arc Fault circuit interrupter (Arc Fault circuit interrupters, abbreviated as AFCI) for household use detects an arcing current in an electrical device, compares the arcing current with a fire hazard action value, and shuts off a power supply when the arcing current exceeds the fire hazard action value. A sensor in which a change in current is detected is a very important component. The AFCI sensor is a current transformer for sensing current change in a live wire at the access end of an electrical device, the AFCI sensor is essentially a transformer, a primary winding is a phase wire and penetrates through the center of a magnetic ring, a secondary winding is an enameled wire and winds the magnetic ring for a certain number of turns, and the output of two ends of the enameled wire is connected to a control board.
A household alternating current (ac) residual current protector (RCD) is a protection measure for preventing human body from electric shock, electric fire and damage to electrical equipment. Which effectively reduces the risk of fire by detecting leakage currents in the electrical apparatus and arcing currents to ground caused by galvanic currents. The sensor of the RCD is a zero sequence current transformer which induces the current difference of the phase line and the neutral line. The zero sequence mutual current sensor is also a transformer; the primary winding is a phase line and a neutral line and penetrates through the center of the magnetic ring, the secondary winding is an enameled wire and winds the magnetic ring for a certain number of turns, and the output ends of the enameled wire are connected to the control board.
A structural list of the primary windings, the secondary windings and the housing of the above-described current transformer and zero sequence current transformer is shown below.
AFCI generally integrates other safety protection functions, such as leakage protection, in addition to fault arc protection. Thus, the device requires at least 2 sensors: zero sequence current transformers and current transformers. According to the general method, the 2 independent units are respectively welded on the control plate; for example, 2 transformer housings are adopted in 2016 filed 8/17/8/32, "leakage protector structure suitable for automatic assembly" publication No. CN 105869962A. For another example, a check plate (30001.8000021MX) used in a lattice washer also uses 2 transformers. Each transformer is made into a unit, and each unit comprises a power input and output interface of a primary winding, a magnetic ring, two interfaces of a secondary winding output and a shell of the two interfaces. The control panel is provided with corresponding mutual inductor installation positions and the interface welding pads. For a primary winding, namely a phase wire or a neutral wire passing through a magnetic ring, a rubber sleeve flexible wire penetrates through the magnetic ring, the production efficiency is low, the consistency is poor, and the rubber sleeve flexible wire is not generally adopted in products with large production capacity. Therefore, the bare wires are mostly fixed on the transformer shell and welded on the PCB at present.
Thus, the primary winding needs 2 phase lines and 1 central line, 6 power line input PCB interfaces, 2 transformer shell installation positions and 4 secondary winding output interfaces. A certain safety distance is also needed between the shells and between the phase lines. Not only occupies larger PCB occupation, but also leads to the increase of the volume of the whole protection device and lower production efficiency. Therefore, there is a need for a structure for integrating two transformers that overcomes any of the above-mentioned drawbacks.
Disclosure of Invention
In view of this, the present invention provides a circuit breaker, a current transformer thereof, and a household appliance including the circuit breaker, wherein the phase lines of the two current transformers and the installation housing are functionally integrated, so that the structural member after being modified and designed serves as a multi-purpose function.
According to a first aspect of the present invention, there is provided a current transformer of a circuit breaker, comprising: the transformer comprises a shell, a zero sequence mutual inductor, a current mutual inductor, a phase conductor and a neutral conductor;
the zero sequence mutual inductor and the current mutual inductor are mutually overlapped and accommodated in the shell;
the induction part of the phase conductor simultaneously penetrates through the zero sequence mutual inductance coil and the current mutual inductance coil, so that the zero sequence mutual inductance coil and the current mutual inductance coil share the phase conductor; and
the induction part of the neutral conductor passes through the zero sequence mutual inductance coil.
Further preferably, the current transformer further comprises:
the middle insulation spacer is positioned between the zero sequence mutual inductor and the current mutual inductor, and the upper insulation spacer is positioned between the phase conductor and the current mutual inductor.
Further preferably, the current transformer further comprises:
and the lower insulating gasket is positioned on the lower side of the zero sequence mutual inductance coil.
Further preferably, the housing is provided with a first pair of pins and a second pair of pins;
a secondary winding of the current mutual inductor is connected to the first pair of contact pins and used as an induction signal output end of the current transformer; and
and the secondary winding of the zero-sequence mutual inductor is connected to the second pair of contact pins and used as an induction signal output end of the zero-sequence mutual inductor.
Further preferably, the housing includes a cylindrical outer peripheral wall portion and an inner peripheral wall portion formed in the outer peripheral wall portion in the stacking direction; the current transformer coil and the zero sequence transformer coil are placed between the outer peripheral wall portion and the inner peripheral wall portion, and the induction portion of the phase conductor and the induction portion of the neutral conductor are located in the inner peripheral wall portion.
It is further preferred that a spacing member is provided between the inductive portion of the phase conductor and the inductive portion of the neutral conductor.
Further preferably, the spacing member is a vertical partition extending in the stacking direction.
Further preferably, a horizontal spacer member is provided inside an outer peripheral wall portion of the housing along a direction perpendicular to the stacking direction to form two upper and lower cavities in the outer peripheral wall portion of the housing, one of the two upper and lower cavities being for accommodating a current transformer, and the other of the two upper and lower cavities being for accommodating a zero sequence transformer.
Further preferably, the vertical partition plate extending along the stacking direction is arranged on the inner side of the inner peripheral wall portion, the vertical partition plate and a semicircle of the inner peripheral wall enclose a cavity penetrating through the zero sequence transformer mounting cavity and the current transformer mounting cavity, and the cavity is an induction portion for accommodating the phase conductor; and the vertical partition plate and the other semicircle of the inner peripheral wall form a cavity which is communicated with the installation cavity of the zero sequence transformer, and the cavity is an induction part for accommodating a neutral conductor.
Further preferably, the outer peripheral wall portion is further formed with a first fixing structure for fixing the phase conductor and a second fixing structure for fixing the neutral conductor.
Further preferably, the first fixing structure comprises:
the clamping structure is used for clamping the clamping part of the phase line conductor, and the clamping part passes through the clamping structure; and
and the limiting structure is formed at the end part of the buckle structure opposite to the shell and used for limiting the limiting part of the phase conductor.
Further preferably, the snap structure is formed as a protruding structure, the protruding structure is provided with a clamping groove, and the clamping part of the phase conductor passes through the clamping groove; and
the limiting structure is provided with a vertical groove for inserting and fixing the limiting part of the phase conductor.
Further preferably, the second fixing structure is formed at a position opposite to the case of the first fixing structure, and has the same structure as the first fixing structure.
Further preferably, the phase conductor and/or the neutral conductor comprises: the device comprises a connecting part, a fixing part, an electric control power supply part, a power output part and an induction part;
the end part of the induction part forms the input end of the power phase line; the fixing part is fixed on the shell; the connecting part is connected between the induction part and the fixing part; the end part of the electric control power supply part is a power supply end, and the power supply output part is provided with a power supply output end.
Further preferably, the phase conductor and/or the neutral conductor comprises: the device comprises a connecting part, a clamping part, a limiting part, an electric control power supply part, a power output part and an induction part;
the end part of the induction part forms the input end of the power phase line; the clamping part is fixed on the buckle structure; the limiting part is fixed on the limiting structure; the connecting part is connected between the induction part and the fixing part; the end part of the electric control power supply part is a power supply end, and the power supply output part is provided with a power supply output end.
It is further preferred that the inductive portion of the phase conductor is longer than the inductive portion of the neutral conductor.
Further preferably, the clamping parts and the limiting parts of the phase conductor and the neutral conductor, the electric control power supply part and the power output part are symmetrically arranged along a central plane in the stacking direction.
Further preferably, the insulating spacer includes: a bottom plate formed along the horizontal direction, wherein a through hole for the induction part of each conductor to pass through is formed in the center of the bottom plate; and a limit rib erected from the periphery of the bottom plate.
Further preferably, a groove is formed in the back of the bottom plate for limiting the phase conductor above the bottom plate or the neutral conductor below the bottom plate after assembly.
Further preferably, the spacing rib includes:
a first cylindrical groove rising from an edge of the bottom plate;
a first cylindrical rib rising from an edge of the bottom plate;
a second cylindrical rib rising from an edge of the bottom plate; and
a second cylindrical groove rising from the edge of the bottom plate.
Further preferably, the first cylindrical bead stands from the bottom plate edge at a position symmetrical to the first cylindrical groove with respect to a center plane in the stacking direction;
the second cylindrical rib stands up from the edge of the bottom plate at a position which is symmetrical to the first cylindrical groove according to a plane vertical to the central plane; and is
The second cylindrical groove is erected from the edge of the bottom plate at a position symmetrical to the second cylindrical rib according to the central plane;
when the two insulating gaskets are assembled with each other, the first cylindrical rib is embedded into the first cylindrical groove, and the second cylindrical rib is embedded into the second cylindrical groove.
Further preferably, the housing comprises: a bottom shell and a middle shell; a zero sequence mutual inductor is arranged below the bottom shell; a neutral conductor is arranged between the middle shell and the bottom shell; the middle shell is provided with a current mutual inductor.
Further preferably, the housing further comprises an upper cover covering above the current transformer coil.
According to a second aspect of the present invention, there is provided a circuit breaker comprising the above current transformer.
According to a third aspect of the invention, there is provided a household appliance comprising the circuit breaker described above.
The current transformer of the present invention is described above. According to the scheme of the invention, two mutual inductor shells are changed into one, one mutual inductor shell is reduced, the safe space between the current mutual inductor and the zero sequence mutual inductor shell on the PCB is saved, and the occupied area of the mutual inductor on the PCB is reduced by more than half. And one phase line is reduced, the number of power interfaces of the primary winding on the PCB is reduced from 6 to 4, the production efficiency is improved, meanwhile, the hidden danger of poor welding is reduced, and the reliability of the electric control board is improved.
The following describes the technical solution of the present invention in detail with reference to the accompanying drawings and the detailed description, and the beneficial effects of the present invention will be further clarified.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 shows an exploded perspective view of a preferred embodiment of a current transformer according to the present invention.
Fig. 2 shows an assembled perspective view of a preferred embodiment of a current transformer according to the present invention.
FIG. 3(a) shows a front plan view of the housing of a preferred embodiment; fig. 3(b) shows a bottom plan view of the housing of a preferred embodiment.
Fig. 4 shows a cross-sectional view of the housing taken along line B-B in fig. 3 (B).
Fig. 5(a) is a plan view showing an assembled structure of the current transformer shown in fig. 2; fig. 5(B) shows a sectional view of the assembled structure taken along the line B-B shown in fig. 5 (a).
Fig. 6(a) shows a perspective view of the phase conductor, fig. 6(B) shows a front view of the structure of the phase conductor shown in fig. 6(a), fig. 6(c) shows a top view of the structure of the phase conductor shown in fig. 6(a), and fig. 6(d) shows a cross-sectional view of the phase conductor taken along line B-B shown in fig. 6 (c).
Fig. 7(a) shows a perspective view of the neutral conductor, fig. 7(B) shows a front view of the structure of the neutral conductor shown in fig. 7(a), fig. 7(c) shows a top view of the structure of the neutral conductor shown in fig. 7(a), and fig. 7(d) shows a cross-sectional view of the neutral conductor taken along line B-B shown in fig. 7 (c).
Fig. 8(a) shows an exploded perspective view of the current transformer according to the present invention with the housing and conductors removed, and fig. 8(b) shows an assembled perspective view of the structure shown in fig. 8 (a).
Fig. 9(a) shows a structural perspective view of an insulating gasket; fig. 9(b) shows a back structure of the insulating spacer; fig. 9(c) shows an assembly plan view of each insulating gasket.
Fig. 10 is an exploded perspective view showing the current transformer according to another preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
[ first embodiment ] A method for manufacturing a semiconductor device
First, a current transformer of a circuit breaker according to the present invention will be described with reference to fig. 1 and 2. Fig. 1 shows an exploded perspective view of a preferred embodiment of a current transformer according to the present invention, and fig. 2 shows an assembled perspective view of a preferred embodiment of a current transformer according to the present invention.
As shown in fig. 1, the current transformer includes: the transformer comprises a shell 3, a zero sequence mutual inductor 2, a current mutual inductor 5, an intermediate insulation gasket 4 positioned between the zero sequence mutual inductor and the current mutual inductor, a phase conductor 6 and a neutral conductor 8, wherein the zero sequence mutual inductor 2, the current mutual inductor 5 and the intermediate insulation gasket 4 are mutually overlapped and accommodated in the shell 3. Wherein the induction portion 65 of the phase conductor 6 (as shown in fig. 5 (b)) passes through both the zero-sequence mutual inductor 2 and the current mutual inductor 5 (preferably the center) such that the zero-sequence mutual inductor 2 and the current mutual inductor 5 share the phase conductor 6; and the induction part of the neutral conductor 8 passes through the zero sequence mutual coil 2 (preferably the centre). That is, the center of the zero sequence mutual inductor 2 is passed by the phase conductor 6 and the neutral conductor 8, and the primary windings of the zero sequence mutual inductor are the phase conductor 6 and the neutral conductor 8; the current transformer 5 only has a phase conductor 6 in the center, and the primary winding of the current transformer is the phase conductor 6.
As shown in fig. 2, the housing 3 is provided with a first pair of pins 31, 32 and a second pair of pins 33, 34. The secondary winding of the current transformer 5 is connected to the first pair of pins 31 and 32 as the sensing signal output of the current transformer, and the secondary winding of the zero sequence transformer 2 is connected to the second pair of pins 33 and 34 as the sensing signal output of the zero sequence transformer. The first pair of pins 31 and 32 and the second pair of pins 33 and 34 are connected to the electronic control board.
Preferably, the current transformer further comprises an upper insulating spacer 7 and a lower insulating spacer 1, wherein the upper insulating spacer 7 is formed at an upper side of the current transformer coil 5, and the lower insulating spacer 1 is formed at a lower side of the zero sequence transformer coil 2. The present invention is not limited to this, and insulation may be achieved by coating an insulating material on a conductor or a coil, for example.
Preferably, as shown in fig. 2, the housing 3 includes a cylindrical outer peripheral wall portion 35 and an inner peripheral wall portion 36 formed inside the outer peripheral wall portion 35, the inner peripheral wall portion 36 extending in the stacking direction. The current transformer 2 and the zero sequence transformer 5 are placed between an outer circumferential wall 35 and an inner circumferential wall 36, and the induction part of the phase conductor 6 and the induction part of the neutral conductor 8 are located in the inner circumferential wall. And preferably a spacing member, such as a vertical partition 37 extending in said stacking direction, is provided between the inductive portion of the phase conductor 6 and the inductive portion of the neutral conductor 8.
The structure of a preferred embodiment of the housing of the current transformer of the present invention is further described below with reference to fig. 3(a), 3(b) and 4, 5(a) and 5 (b). FIG. 3(a) shows a front plan view of the housing 3 of a preferred embodiment; fig. 3(b) shows a bottom plan view of the housing of a preferred embodiment. Fig. 4 shows a cross-sectional view of the housing taken along line B-B in fig. 3 (B). Fig. 5(a) shows a plan view of an assembly structure of the current transformer shown in fig. 2, and fig. 5(B) shows a sectional view of the assembly structure taken along a line B-B shown in fig. 5 (a).
It is further preferred that said vertical partition 37 extending in said stacking direction is provided inside (preferably at its central position) the inner peripheral wall portion 36, so that the vertical partition 37 and the inner peripheral wall portion 36 enclose two cavities, one being a first cavity 312 accommodating the inductive portion of the phase conductor and the other being a second cavity 310 accommodating the inductive portion of the neutral conductor, as shown in fig. 4. And further preferably, a horizontal partition member, such as a horizontal partition plate 38, is provided inside the outer peripheral wall portion 35 of the housing 3 in a direction perpendicular to the stacking direction, so that upper and lower two cavities, i.e., an upper cavity 39 for accommodating the current transformer 5 at the upper portion and a lower cavity 311 for accommodating the zero sequence transformer 2 at the lower portion, are formed in the outer peripheral wall portion 35 of the housing 3. It should be noted that the horizontal spacing member is not necessary and the form thereof is not limited to the horizontal partition plate as long as it is advantageous to realize the relative positions of the current mutual coil 5 and the zero-sequence mutual coil 2 in the housing 3, and may be, for example, a flange or the like formed at the central position in the stacking direction inside the outer peripheral wall portion of the housing 3.
And further, as shown in fig. 3(a) and 5(b), a first fixing structure 313 and a second fixing structure 314 for fixing the phase conductor 6 and the neutral conductor 8, respectively, are formed on the outer peripheral wall portion 35 of the housing 3. Preferably, the first fixing structure 313 is formed on the right side of the upper surface of the horizontal partition 38, and comprises a snap-fit structure 3131 for clamping the clamping part 67 of the phase conductor 6 passing in the horizontal direction (as shown in fig. 5 (b)); and a stopper structure 3132 formed at an end of the pair of snaps 3131 on a side away from the housing 3 for stopping the phase conductor 6. As shown in fig. 5(b), the latch 3131 is, for example, a protrusion formed with a slot for passing the locking portion 67 of the phase conductor 6, and the stopper 3132 is, for example, a stopper formed with a vertical slot for inserting and fixing the vertical end portion, i.e., the stopper 68 (shown in fig. 5 (b)), of the phase conductor 6. Similarly, a second fixing structure 314, similar in construction to the first fixing structure 313, for fixing the neutral conductor 8 is provided at a position on the side of the first fixing structure 313 remote from the housing 3. It should be noted that the above-mentioned fixing structure is not limited thereto as long as the fixing of the phase conductor can be achieved.
The structure of the phase conductor 6 and the neutral conductor 8 according to a preferred embodiment of the present invention will be described below with reference to fig. 2, 6(a) -6(d), and 7(a) -7 (d). Fig. 6(a) shows a perspective view of the phase conductor, fig. 6(B) shows a front view of the structure of the phase conductor shown in fig. 6(a), fig. 6(c) shows a top view of the structure of the phase conductor shown in fig. 6(a), and fig. 6(d) shows a cross-sectional view of the phase conductor taken along line B-B shown in fig. 6 (c). Fig. 7(a) shows a perspective view of the neutral conductor, fig. 7(B) shows a front view of the structure of the neutral conductor shown in fig. 7(a), fig. 7(c) shows a top view of the structure of the neutral conductor shown in fig. 7(a), and fig. 7(d) shows a cross-sectional view of the neutral conductor taken along line B-B shown in fig. 7 (c).
As shown first in fig. 2, the phase conductor 6 is provided with ends 61, 62, 63; end 61 is the input end of the power phase line, and end 63 is the output end of the power phase line; and end 62 is the phase supply terminal that can be used as an electrical control circuit. The power phase line output is provided with a contact 60 which can be used as a stationary contact of the protection device and also as a movable contact of the protection device.
As shown in fig. 6(a) -6(d), the phase conductor includes an inductive portion 65, a connecting portion 66, a clamping portion 67, a limiting portion 68, an electrically controlled power supply portion 69 and a power output portion 610. As described above, the induction part 65 penetrates the current transformer coil 5 and the zero sequence transformer coil 2 at the same time, and forms the input end 61 of the power phase line at its end, the clamping part 67 and the stopper 68 are fixed to the snap structure 3131 and the stopper 3132 on the housing 3, respectively, and the connection part 66 is connected between the induction part 65 and the clamping part 67. The end of the electric control power supply part 69 is the power supply phase line end 62, and the power supply output part 610 is provided with the power supply phase line output end 63.
Similarly, as shown in fig. 2, 7(a) -7(d), the neutral conductor 8 has a configuration substantially corresponding to the phase conductor 6. Specifically, as shown in fig. 2, the neutral conductor 8 is provided with end portions 81, 82, 83; end 81 is a power neutral input end and end 83 is a power neutral output end; and end 82 is the supply neutral terminal of the electrical control circuit. The power neutral output is provided with a contact 80 which acts as a stationary contact for the protection device.
As shown in fig. 7(a) -7(d), the neutral conductor includes a sensing portion 85, a connecting portion 86, a clamping portion 87, a stopper portion 88, an electrically controlled power supply portion 89, and a power output portion 810. As mentioned above, the induction part 85 passes through the zero sequence mutual coil 2 and forms said neutral input 81 at its end. Similar to the phase conductor 6, the clamping portion 87 and the limiting portion 88 are respectively fixed to the second fixing structure 314 of the housing 3, and will not be described in detail. And a connecting portion 86 connected between the sensing portion 85 and the chucking portion 87. The end of the electrically controlled power supply section 89 is the power supply neutral terminal 82, and the power supply output section 810 is provided with the power supply neutral output terminal 83.
It is further preferred that the inductive portion 65 of the phase conductor 6 is relatively long to facilitate its simultaneous penetration through the centers of the zero sequence transformer 2 and the current transformer 5; the connection 66 is above the zero sequence transformer 2 and the current transformer 5. The induction portion 85 of the neutral conductor 8 is relatively short, passing only through the center of the zero sequence mutual inductor 2; with the connection 86 between the zero sequence transformer and the current transformer.
And further preferably, the gripping portions 67/87 and the stopper portions 68/88 of the phase conductor 6 and the neutral conductor 8, the electrically controlled power feeding portion 69/89 and the power output portion 610/810 are symmetrically arranged in accordance with a vertical center plane (a center plane in the stacking direction, i.e., a plane passing through the center in the thickness direction of the vertical partition 37 as shown in fig. 5 (b)). But it is clear that the solution of the invention is not so limited.
The structure of each preferred embodiment of the gasket according to the present invention will be described below with reference to fig. 1, 8(a), 8(b), and 9(a), 9(b), and 9 (c). Fig. 8(a) shows an exploded perspective view of the current transformer according to the present invention with the housing and conductors removed, and fig. 8(b) shows an assembled perspective view of the structure shown in fig. 8 (a). Fig. 9(a) shows a structural perspective view of an insulating gasket; fig. 9(b) shows a back structure of the insulating spacer; fig. 9(c) shows an assembly plan view of each insulating gasket.
As shown in fig. 1 and 8(a), the lower edge gasket 1 is installed below the zero sequence mutual inductor 2; the middle insulating spacer 4 is arranged below the current transformer coil 5; the upper insulating spacer 7 is mounted on the current transformer coil 5. The intermediate insulating spacer 4 electrically isolates the current transformer coil 5 from the neutral conductor 8; the upper insulating spacer 7 electrically isolates the current transformer 5 from the phase conductor 6, preventing direct contact between the transformer and the conductor and thus burning out of the short circuit by electrical shock. Preferably, each insulating spacer is made of silicone rubber and has certain elasticity so as to compensate a rigid assembly gap between the mutual inductor and the shell.
Preferably, the insulating spacers 1, 4, and 7 have the same structure and can be fitted and attached to each other. The following insulating spacer 1 is an example, and the structure of the insulating spacer is described with reference to fig. 9(a) and 9 (b). Fig. 9(a) shows a perspective view of the structure of the insulating gasket. As shown in fig. 9(a), the insulating spacer has a bottom plate 11 in the horizontal direction, and a through hole 111 is formed in the center of the bottom plate for passing through the inner peripheral wall 36 of the housing 3 and the sensing portion of each conductor; and a plurality of stopper ribs rising from the periphery (preferably the periphery) of the bottom plate 11. As shown in fig. 9(b), the base plate 11 is preferably provided with a groove 12 on the back surface for limiting the phase conductor above it or the neutral conductor below it after assembly. Preferably, the four corners of the upper surface of the bottom plate 11 are provided with the limiting ribs of the mutual inductor, and the surrounding shape formed by the limiting ribs at the four corners is slightly smaller than that of the shell installation cavity. The stopper rib is described below.
As shown in fig. 9(a), one of the four-angled ribs has a first cylindrical groove 13 formed therein. First cylindrical ribs 14 rising from the edge of the bottom plate are provided at positions symmetrical to the first cylindrical grooves 13 with respect to a center plane in the stacking direction (a plane passing through the center of the vertical partition 37 as shown in fig. 5 (b)). Second cylindrical ribs 15 rising from the edge of the base plate are provided at positions symmetrical to the first cylindrical grooves 13 in terms of a plane perpendicular to the center plane. A second cylindrical groove 16 is provided on the corner rib at a position symmetrical to the second cylindrical rib 15 along the center plane. And a bulge 17 is arranged beside the first cylindrical groove 13, and a through groove 18 is arranged at the position symmetrical to the vertical central plane.
As shown in fig. 8(b), two insulating gaskets are assembled face to face. The first cylindrical rib 14 is fitted right into the first cylindrical groove 13, and the second cylindrical rib 15 is fitted right into the second cylindrical groove 16, thereby forming an assembled state as shown in fig. 8 (b).
Preferably, the height of the four-corner ribs of the insulating spacer is slightly less than half of the height of the current transformer coil; the depth of each cylindrical groove is equal to the height of the four-angle rib; the height of each cylindrical rib is slightly smaller than that of the quadrangular rib. The diameter of each cylindrical groove is equal to the diameter of each cylindrical rib.
Furthermore, in order to prevent air trapping from influencing assembly, the groove columns are matched with side assembly exhaust notches.
Further, a routing specification path is set. The protrusion 17 fits right into the groove 18, forming the closed gap 10 as shown in fig. 9 (c). The output line of the current mutual inductor is led out from the gap, goes downwards to the bottom of the shell along the edge of the shell and is wound on the corresponding contact pin.
[ second embodiment ]
As an alternative embodiment, the mounting and isolation functions of the shell and the insulating gasket can be decomposed and combined, and the occupied area of the mutual inductor on the PCB can be reduced as long as the mutual inductor is mounted in a stacked mode. Meanwhile, the phase conductor and the line conductor have two purposes, namely the primary winding of the zero sequence transformer and the primary winding of the current transformer, so that the parts can be reduced, the reliability is improved, and the purpose of the invention is achieved. The specific shape and characteristics, the up, down, left and right structural orientations and the like of the shell, the conductor, the gasket and the like can be changed correspondingly according to the specific assembling condition of the applied protection device. A current transformer of another embodiment of the present invention is described below.
Fig. 10 is an exploded perspective view showing the current transformer according to another preferred embodiment of the present invention. As shown in fig. 10, the current transformer includes: 4 pins 101, two identical spacers 102 and 109, zero sequence transformer 103, a bottom shell 104, a neutral conductor 1010, a middle shell 105, a current transformer 106, a phase conductor 107, and a top cover 108. And a zero sequence mutual inductor 103 is arranged below the bottom shell 104, and a silica gel gasket 102 is arranged below the zero sequence mutual inductor 103. A neutral conductor 1010 is mounted between the middle shell 105 and the bottom shell 104. A current transformer coil 106 is arranged on the middle shell 105; a silica gel gasket 109 is arranged on the current transformer coil 106. A phase conductor 107 is mounted on a silicone gasket 109. Above the phase conductors is an upper cover 108. The upper cover 108 and the bottom case 109 are connected by a snap fit to fix the coil and the conductor therein together.
Among the above-mentioned current transformer, can stack the installation from bottom to top, the assembly is simple. The shape of the insulating gasket is simple, and can be reduced from 3 to 2; the housing is broken down into three parts, namely an upper cover, a middle shell and a bottom shell, with reference to the embodiment of fig. 1.
The current transformer of the present invention is described above. According to the scheme of the invention, two mutual inductor shells are changed into one, one mutual inductor shell is omitted, the safety space between the current mutual inductor and the zero sequence mutual inductor shell on the PCB is saved, the occupied area of the mutual inductor on the PCB is reduced by more than half, one phase line is omitted, the number of power interfaces of the primary winding on the PCB is reduced from 6 to 4, the production efficiency is improved, the hidden danger of poor welding is reduced, and the reliability of the electric control board is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (25)
1. A current transformer of a circuit breaker, comprising: the transformer comprises a shell, a zero sequence mutual inductor, a current mutual inductor, a phase conductor and a neutral conductor;
the zero sequence mutual inductor and the current mutual inductor are mutually overlapped and accommodated in the shell;
the induction part of the phase conductor simultaneously penetrates through the zero sequence mutual inductor and the current mutual inductor, so that the zero sequence mutual inductor and the current mutual inductor share the phase conductor; and
the induction part of the neutral conductor penetrates through the zero sequence mutual inductance coil.
2. The current transformer of claim 1, further comprising:
the middle insulation spacer is positioned between the zero sequence mutual inductor and the current mutual inductor, and the upper insulation spacer is positioned between the phase conductor and the current mutual inductor.
3. The current transformer of claim 1, further comprising:
and the lower insulating gasket is positioned on the lower side of the zero sequence mutual inductance coil.
4. The current transformer of claim 1, wherein,
the shell is provided with a first pair of contact pins and a second pair of contact pins;
a secondary winding of the current mutual inductor is connected to the first pair of contact pins and used as an induction signal output end of the current transformer; and
and the secondary winding of the zero-sequence mutual inductor is connected to the second pair of contact pins and used as an induction signal output end of the zero-sequence mutual inductor.
5. The current transformer of claim 1, wherein,
the housing includes a cylindrical outer peripheral wall portion and an inner peripheral wall portion formed in the outer peripheral wall portion in the stacking direction; the current transformer coil and the zero sequence transformer coil are placed between the outer peripheral wall portion and the inner peripheral wall portion, and the induction portion of the phase conductor and the induction portion of the neutral conductor are located in the inner peripheral wall portion.
6. The current transformer of claim 5, wherein,
and a spacing component is arranged between the induction part of the phase conductor and the induction part of the neutral conductor.
7. The current transformer of claim 6, wherein,
the spacer member is a vertical partition extending in the stacking direction.
8. The current transformer of claim 5, wherein,
a horizontal spacer member is provided along a direction perpendicular to the stacking direction inside the outer peripheral wall portion of the housing to form upper and lower two cavities in the outer peripheral wall portion of the housing, one of the upper and lower two cavities being for accommodating a current transformer, and the other of the upper and lower two cavities being for accommodating a zero sequence transformer.
9. The current transformer according to claim 7, wherein said vertical partition extending in said stacking direction is provided inside the inner peripheral wall portion, and encloses with a semicircle of the inner peripheral wall a cavity penetrating the zero sequence transformer installation chamber and the current transformer installation chamber, the cavity being a sensing portion accommodating the phase conductor;
and the vertical partition plate and the other semicircle of the inner peripheral wall form a cavity which is communicated with the installation cavity of the zero sequence transformer, and the cavity is an induction part for accommodating a neutral conductor.
10. The current transformer according to any one of claims 5 to 9, wherein,
and a first fixing structure and a second fixing structure are further formed on the outer peripheral wall part, the first fixing structure is used for fixing the phase conductor, and the second fixing structure is used for fixing the neutral conductor.
11. The current transformer of claim 10,
the first fixing structure includes:
the clamping structure is used for clamping the clamping part of the phase line conductor, and the clamping part passes through the clamping structure; and
and the limiting structure is formed at the end part of the buckle structure opposite to the shell and used for limiting the limiting part of the phase conductor.
12. The current transformer of claim 11,
the clamping structure is formed into a protruding structure, a clamping groove is formed in the protruding structure, and the clamping part of the phase conductor passes through the clamping groove; and
the limiting structure is provided with a vertical groove for inserting and fixing the limiting part of the phase conductor.
13. The current transformer of claim 12, wherein,
the second fixing structure is formed at a position opposite to the case of the first fixing structure, and has the same structure as the first fixing structure.
14. The current transformer according to any one of claims 1 to 9, wherein,
the phase conductor and/or the neutral conductor comprise: the connecting part, the fixing part, the electric control power supply part, the power output part and the induction part;
the end part of the induction part forms the input end of a power phase line; the fixed part is fixed on the shell; the connecting part is connected between the induction part and the fixing part; the end part of the electric control power supply part is a power supply end, and the power supply output part is provided with a power supply output end.
15. The current transformer according to any one of claims 11 to 13, wherein,
the phase conductor and/or the neutral conductor comprise: the connecting part, the clamping part, the limiting part, the electric control power supply part, the power output part and the induction part;
the end part of the induction part forms the input end of a power phase line; the clamping part is fixed on the buckle structure; the limiting part is fixed on the limiting structure; the connecting part is connected between the induction part and the fixing part; the end part of the electric control power supply part is a power supply end, and the power supply output part is provided with a power supply output end.
16. The current transformer of claim 14,
the inductive portion of the phase conductor is longer than the inductive portion of the neutral conductor.
17. The current transformer of claim 15, wherein,
the clamping parts and the limiting parts of the phase conductor and the neutral conductor, the electric control power supply part and the power output part are symmetrically arranged along the central plane in the overlapping direction.
18. The current transformer according to claim 2 or 3, wherein,
the insulating gasket includes: the bottom plate is formed along the horizontal direction, and a through hole for the induction part of each conductor to pass through is formed in the center of the bottom plate; and a limit rib erected from the periphery of the bottom plate.
19. The current transformer of claim 18,
and a groove is formed in the back of the bottom plate and used for limiting the phase conductor above the bottom plate or the neutral conductor below the bottom plate after assembly.
20. The current transformer of claim 18,
the spacing muscle includes:
a first cylindrical trough rising from an edge of the base plate;
a first cylindrical rib rising from an edge of the bottom plate;
a second cylindrical rib rising from an edge of the bottom plate; and
a second cylindrical groove rising from an edge of the base plate.
21. The current transformer of claim 20,
the first cylindrical bead stands from the bottom plate edge at a position symmetrical to the first cylindrical groove with respect to a center plane in the stacking direction;
the second cylindrical rib is erected from the edge of the bottom plate at a position symmetrical to the first cylindrical groove according to a plane perpendicular to the central plane; and is
The second cylindrical groove is erected from the edge of the bottom plate at a position symmetrical to the second cylindrical rib according to the central plane;
when the two insulating gaskets are assembled with each other, the first cylindrical rib is embedded into the first cylindrical groove, and the second cylindrical rib is embedded into the second cylindrical groove.
22. The current transformer according to any one of claims 1 to 9, wherein,
the housing includes: a bottom shell and a middle shell; a zero sequence mutual inductor is arranged below the bottom shell; the neutral conductor is arranged between the middle shell and the bottom shell; and a current mutual inductor is arranged on the middle shell.
23. The current transformer of claim 22,
the shell further comprises an upper cover, and the upper cover covers the current mutual inductor.
24. A circuit breaker comprising a current transformer according to any one of claims 1-23.
25. A household appliance comprising a circuit breaker according to claim 24.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710855351.4A CN107680881B (en) | 2017-09-20 | 2017-09-20 | Circuit breaker and current transformer thereof, and household appliance comprising circuit breaker |
| PCT/CN2018/091029 WO2019056812A1 (en) | 2017-09-20 | 2018-06-13 | Circuit interrupter and current transformer thereof, and household appliance including circuit interrupter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710855351.4A CN107680881B (en) | 2017-09-20 | 2017-09-20 | Circuit breaker and current transformer thereof, and household appliance comprising circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107680881A CN107680881A (en) | 2018-02-09 |
| CN107680881B true CN107680881B (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710855351.4A Active CN107680881B (en) | 2017-09-20 | 2017-09-20 | Circuit breaker and current transformer thereof, and household appliance comprising circuit breaker |
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| Country | Link |
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| CN (1) | CN107680881B (en) |
| WO (1) | WO2019056812A1 (en) |
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| CN107680881B (en) * | 2017-09-20 | 2019-12-27 | 珠海格力电器股份有限公司 | Circuit breaker and current transformer thereof, and household appliance comprising circuit breaker |
| CN109509626A (en) * | 2018-12-12 | 2019-03-22 | 珠海格力电器股份有限公司 | Transformer component, arc fault protector |
| CN110600240A (en) * | 2019-09-29 | 2019-12-20 | 济南铂晶电子科技有限公司 | Subminiature mutual inductor, combined mutual inductor and mutual inductor framework |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207367895U (en) * | 2017-09-20 | 2018-05-15 | 珠海格力电器股份有限公司 | Breaker and its current transformer and the household electrical appliance comprising the breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060006974A1 (en) * | 2004-07-08 | 2006-01-12 | Taipei Multipower Electronics Co., Ltd. | [transformer module] |
| CN201181682Y (en) * | 2008-04-14 | 2009-01-14 | 浙江加西亚电子电器有限公司 | Multifunctional small circuit breaker |
| JP2009266462A (en) * | 2008-04-23 | 2009-11-12 | Nitto Electric Works Ltd | Detection unit |
| CN101728126A (en) * | 2008-10-13 | 2010-06-09 | 施耐德电器工业公司 | Electronic leakage protector |
| CN205039053U (en) * | 2015-09-17 | 2016-02-17 | 河南瑞特电气有限公司 | High accuracy zero sequence protection integral type current transformer |
| CN107680881B (en) * | 2017-09-20 | 2019-12-27 | 珠海格力电器股份有限公司 | Circuit breaker and current transformer thereof, and household appliance comprising circuit breaker |
-
2017
- 2017-09-20 CN CN201710855351.4A patent/CN107680881B/en active Active
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- 2018-06-13 WO PCT/CN2018/091029 patent/WO2019056812A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207367895U (en) * | 2017-09-20 | 2018-05-15 | 珠海格力电器股份有限公司 | Breaker and its current transformer and the household electrical appliance comprising the breaker |
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| Publication number | Publication date |
|---|---|
| WO2019056812A1 (en) | 2019-03-28 |
| CN107680881A (en) | 2018-02-09 |
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