CN215266156U

CN215266156U - Thermo-electromagnetic release

Info

Publication number: CN215266156U
Application number: CN202120989928.2U
Authority: CN
Inventors: 周月浩; 郭德鑫; 黎佳财; 王以盾; 李俐
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-12-21
Anticipated expiration: 2031-05-08

Abstract

The utility model provides a thermal electromagnetic trip, it includes the support and installs coil pack and the heating element on the support respectively, the heating element includes heating element and bimetallic strip, heating element is connected with the coil pack electricity, the bimetallic strip is parallelly connected with heating element through electrically conductive, on the basis that coil pack and heating element are established ties, again with the bimetallic strip through electrically conductive and parallelly connected with heating element, the electric current of heating element and bimetallic strip has not only been shunted, can avoid the bimetallic strip fusing to appear, and the bimetallic strip can be in spontaneous heating, again can be heated by heating element, even rated current is less, the inconsistent problem of time delay action because of giving out heat little and leading to can not appear yet.

Description

Thermo-electromagnetic release

Technical Field

The utility model relates to a low-voltage apparatus field especially relates to a thermoelectric magnetic release.

Background

The thermo-electromagnetic release is a key actuating element of the circuit breaker, and a bimetallic strip of the thermo-electromagnetic release can be bent when the temperature changes, for example, when the line is overloaded and the temperature is raised, the circuit breaker is triggered to trip through the bending of the bimetallic strip. The operating principle of the bimetallic strip is generally divided into a direct heating type and an indirect heating type, the direct heating type enables current to pass through the bimetallic strip, the bimetallic strip is directly heated and bent, the bimetallic strip can only be used on a circuit breaker with smaller rated current, and otherwise, the bimetallic strip is easily fused. The indirectly heated current does not pass through the bimetallic strip but passes through another heating element, and the bimetallic strip is heated by the heating element, so that although the application is wider, the heating element has smaller heat productivity and the consistency of the delay action is poor.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a possess the thermoelectric magnetism release of direct heat and side hot heating methods simultaneously.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a thermal electromagnetic trip, its includes the support and installs coil pack and the heating element on the support respectively, the heating element includes heating element and bimetallic strip, and heating element is connected with the coil pack electricity, and the bimetallic strip is parallelly connected with heating element through electrically conductive piece.

Preferably, the bimetal comprises at least two bimetal strips arranged at intervals, one ends of the at least two bimetal strips are connected together through a bimetal connecting sheet, and the other ends of the at least two bimetal strips are respectively fixed on the heating element through conductive pieces.

Preferably, bimetallic strip integrated into one piece is U type structure, and the middle part of bimetallic strip is equipped with the fluting, and bimetallic strip is including setting up two bimetallic strips in the fluting both sides relatively to and connect the two gold connection pieces between two bimetallic strip one end, and the other end of two bimetallic strips is fixed on heating element through electrically conductive piece respectively.

Preferably, the heating element includes a heating portion and a fixing portion, the heating portion and the bimetal are respectively in a U-shaped structure, two ends of the heating portion and two ends of the bimetal are respectively connected, other portions of the heating portion and the bimetal are arranged at intervals, one end of the heating portion is connected with the fixing portion, and the other end of the heating portion is arranged at intervals with the fixing portion.

Preferably, the heating portion is provided with a second slot, the heating portion comprises two heating strips which are oppositely arranged on two sides of the second slot and a heating piece connected between one ends of the two heating strips, the other end of one of the heating strips is respectively connected with one end of the bimetallic strip and the fixing portion, the other end of the other heating strip is connected with one end of the bimetallic strip and is arranged at an interval with the fixing portion, one end of each of the two heating strips, which is connected with the heating piece, is bent towards one side far away from the bimetallic strip, and a spacing groove is formed between the heating element and the bimetallic strip.

Preferably, the coil assembly comprises an insulation assembly and a lead group arranged in the insulation assembly, an iron core is arranged on the inner side of the lead group, one end of the lead group is connected with the connecting plate, and the other end of the lead group is connected to a part of the heating element and the bimetallic strip which are arranged at intervals through flexible connection.

Preferably, the bracket comprises a left side plate and a right side plate which are arranged oppositely, a left magnetic yoke and a right magnetic yoke are fixedly arranged on the inner sides of the left side plate and the right side plate respectively, and the left magnetic yoke and the right magnetic yoke are arranged on two sides of the coil assembly oppositely.

Preferably, a heat shrinkable tube included in the iron core is provided inside the lead group.

Preferably, the both sides of armature are equipped with the bump respectively, the top side of left side board and right side board is equipped with the recess that is U type structure respectively, and the bump can insert the recess internal rotation of corresponding left side board and right side board respectively, and left side board and right side board are equipped with the spacing portion that is used for spacing armature respectively in the side that is close to armature.

Preferably, the iron core and/or the heating element are respectively provided with a boss structure, the left magnetic yoke and the right magnetic yoke are respectively provided with a through hole structure corresponding to the boss structures, and the boss structures penetrate through the corresponding through hole structures and then are riveted and fixed.

Preferably, boss structures are respectively arranged on the left magnetic yoke and the right magnetic yoke, through hole structures corresponding to the boss structures are respectively arranged on the left side plate and the right side plate, and the boss structures penetrate through the corresponding through hole structures and then are riveted and fixed.

The utility model discloses a thermal electric magnetism release, on the basis of coil pack and heating element series connection, connect bimetallic strip in parallel with heating element through electrically conductive piece again, not only shunted the electric current of heating element and bimetallic strip, can avoid bimetallic strip fusing to appear, bimetallic strip can be in self-heating in addition, can be heated by heating element again, even rated current is less, the inconsistent problem of time delay action that can not appear because of giving out heat little and lead to yet.

In addition, through setting up the fluting in the middle part at bimetallic strip, make bimetallic strip be U type structure, shunt through two bimetallic strips, can avoid heavy current to burn out bimetallic strip.

Drawings

FIG. 1 is a schematic view of a thermo-electromagnetic release of the present invention;

fig. 2 is a left side view of the thermo-electromagnetic release of the present invention;

fig. 3 is an exploded top view of the thermo-electromagnetic release of the present invention;

fig. 4 is an exploded view of the thermo-electromagnetic release of the present invention;

fig. 5 is an enlarged view of a portion of fig. 4 according to the present invention;

fig. 6 is a schematic view of the bimetallic strip and the heating element of the present invention;

fig. 7 is a schematic view of the current flow on one side of the bimetal and the heating element of the present invention;

fig. 8 is a schematic view of the current flowing between the bimetal and the other side of the heating element according to the present invention.

Detailed Description

The following provides a further description of the embodiments of the thermo-electromagnetic release according to the present invention with reference to the examples shown in fig. 1 to 6. The thermo-electromagnetic release of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-6, the thermo-electromagnetic release of the present invention comprises a support, and a coil assembly and a heating assembly respectively mounted on the support, wherein the heating assembly comprises a heating element 11 and a bimetal strip 13, the heating element 11 is electrically connected to the coil assembly through a flexible connection 16, and the bimetal strip 13 is connected in parallel to the heating element 11 through a conductive piece 12. In this embodiment, one side of the heating element 11 away from the bimetal 13 is connected to the coil assembly through a flexible connection 16, and the bimetal 13 is fixed to the other side of the heating element 11 through a conductive member 12.

The utility model discloses a thermal electromagnetic release, on the basis that coil pack and heating element 11 are established ties through flexible coupling 16, connect bimetallic strip 13 in parallel with heating element 11 through electrically conductive piece 12 again, heating element 11 and bimetallic strip 13's electric current has not only been shunted, can avoid bimetallic strip 13 fusing to appear, bimetallic strip 13 can be in spontaneous heating in addition, can be heated by heating element 11 again, even rated current is less, the inconsistent problem of time delay action because of giving out heat little to lead to can not appear yet.

As shown in fig. 5 to 6, the bimetal includes at least two bimetal strips 132 arranged at intervals, one ends of the at least two bimetal strips 132 are connected together by a bimetal connecting strip 133, and the other ends of the at least two bimetal strips 132 are respectively fixed on the heating element 11 by the conductive member 12. The bimetallic strip 13 integrated into one piece of this embodiment is U type structure, the middle part of bimetallic strip 13 is equipped with fluting 131, bimetallic strip 13 is including relative two bimetallic strips 132 that set up in fluting 131 both sides, and connect the bimetallic strip 133 between two bimetallic strip 132 one end, the other end of two bimetallic strips 132 is fixed on heating element 11 through conductive 12 respectively, be equipped with adjusting screw 14 on bimetallic strip 133, bimetallic strip 13 drives adjusting screw 14 when crooked and triggers the operating device of circuit breaker, make operating device drive circuit breaker trip, the time delay characteristic can be adjusted to the length of adjustment adjusting screw 14 screw in. This embodiment sets up fluting 131 through the middle part at bimetallic strip 13, makes bimetallic strip 13 be U type structure, shunts through two bimetallic strips 132, can avoid heavy current to burn out bimetallic strip 13.

Preferably, the conductive device 12 is a rivet, and other components may be adopted for the conductive device 12, which is not particularly limited. It can be understood that the bimetal includes at least two bimetal strips 132 arranged at an interval, the bimetal strips 132 can be three or more, for example, the bimetal 13 can be a W-shaped structure formed by three bimetal strips 132, one ends of at least two bimetal strips 132 are connected together through a bimetal connecting piece 133, and the other ends of at least two bimetal strips 132 are respectively fixed on the heating element 11 through the conductive piece 12, and the bimetal strip has a shunt effect, and the protection scope of the present invention is also included.

As shown in fig. 5 to 6, the heating element 11 includes a heating portion and a fixing portion, the heating portion is of a U-shaped structure, the heating portion and the bimetal 13 are of a U-shaped structure, two ends of the heating portion and the bimetal 13 are connected to each other, the other portions of the heating portion and the bimetal 13 are disposed at intervals, one end of the heating portion is connected to the fixing portion, and the other end of the heating portion is disposed at intervals to the fixing portion.

The heating part is of a U-shaped structure, so that the cross section area can be reduced, the heating amount is increased, the reliable work can be realized under the condition of low ampere current, the heating part is matched with the U-shaped structure of the bimetallic strip 13, the heating part can be directly connected with the bimetallic strip 13 in parallel, no extra space is occupied, and the heating part has the characteristic of small size.

Specifically, the heating element 11 includes a heating portion and a fixing portion, the fixing portion includes two fixing pins 114 oppositely disposed at two sides of the heating portion, and a fixing plate 115 respectively connected to the two fixing pins 114, the heating portion is in a U-shaped structure corresponding to the bimetal 13, a second slot 111 is disposed at a middle portion of the heating portion, the heating portion includes two heating strips 112 oppositely disposed at two sides of the second slot 111, and a heating plate 113 connected between one ends of the two heating strips 112, one end of one heating strip 112 is respectively connected to one end of the bimetal 13 and the fixing plate 115, the other end of the other heating strip 112 is connected to one end of the bimetal 13 and is disposed at an interval from the fixing portion, two bimetal strips 132 of the bimetal 13 are respectively fixed to the two heating strips 112 through a conductive member 12, a slot 131 of the bimetal 13 corresponds to the second slot 111 on the heating portion, the ends of the two heating strips 112 connected to the heating strip 113 are bent toward the sides away from the bimetal 13, respectively, and a spacing groove 110 is formed between the heating element 11 and the bimetal 13. The heating portion and the other portion of the bimetal 13 are disposed at an interval, that is, the heating portion and the portion of the bimetal 13 where the intermediate portion forms the interval groove 110 are disposed at an interval.

As shown in fig. 1 to 4, the present embodiment further includes an armature 15 rotatably mounted on a support, the support includes a left side plate 8 and a right side plate 9 which are oppositely disposed, a left magnetic yoke 6 and a right magnetic yoke 5 are respectively fixedly mounted on the inner sides of the left side plate 8 and the right side plate 9, the left magnetic yoke 6 and the right magnetic yoke 5 are oppositely disposed on two sides of the coil assembly, the armature 15 is rotatably connected with the left side plate 8 and the right side plate 9, an upper hook 21 is disposed on the armature 15, the left magnetic yoke 6 is provided with a lower hook 20, and a spring 10 is connected between the upper hook 21 and the lower hook 20 for driving the armature 15. Not only can satisfy the instantaneous action multiple of different ampere products through the elasticity size of adjustment spring 10, left yoke 6 and right yoke 5 can guarantee that little ampere of circuit breaker can enlarge the magnetic field when overload protection moreover, can prevent product malfunction or inaction.

Preferably, armature 15 sets up perpendicularly between left side board 8 and right side board 9, and the both sides of armature 15 are equipped with bump 151 respectively, the top side of left side board 8 and right side board 9 is equipped with the recess 22 that is the U type structure respectively, and bump 151 can insert the recess 22 internal rotation of left side board 8 and right side board 9 that correspond respectively, and left side board 8 and right side board 9 are equipped with spacing portion 23 that is used for spacing armature 15 respectively in the side that is close to armature 15, rotate armature 15 with left side board 8 and right side board 9 respectively and be connected, through spacing armature 15 of spacing portion 23 simultaneously, prevent that armature 15 from droing. The groove 22 of the embodiment is of a U-shaped structure, so that the salient point 151 can be conveniently inserted, the assembly difficulty of the armature 15 can be reduced, and the armature 15 can not fall off when rotating by limiting the armature 15 through the limiting part 23.

As shown in fig. 3-4, the coil assembly includes an insulating assembly 7 and a wire group 2 disposed in the insulating assembly 7, a heat shrinkable tube 3 is disposed inside the wire group 2, an iron core 4 is disposed inside the heat shrinkable tube 3, one end of the wire group 2 extends out of the insulating assembly 7 and is connected to the connection plate 1, the other end of the wire group 2 extends out of the insulating assembly 7 and is connected to a portion where the heating element 11 and the bimetal 13 are spaced apart by a flexible connection 16, the wire group 2 is used for amplifying a magnetic field of the iron core 4, and the attraction force between the armature 15 and the iron core 4 can be increased by amplifying the magnetic field.

The current path of the thermo-electromagnetic release of the embodiment is the connecting plate 1, the wire group 2, the flexible connection 16, and then the heating element 11 and the bimetallic strip 13 which are connected in parallel, compared with the conventional path of the existing connecting plate, the wire group, the flexible connection 16, the bimetallic strip and the heating element, the current of the heating element 11 and the bimetallic strip 13 is shunted, the bimetallic strip 13 can be prevented from fusing, and the bimetallic strip 13 can be heated by the heating element 11 while self-heating, so that the consistency of time delay action is improved.

As shown in fig. 2, the iron core 4 and/or the heating element 11 are respectively provided with a boss structure, the left magnetic yoke 6 and the right magnetic yoke 5 are respectively provided with a through hole structure corresponding to the boss structure, the boss structure can be provided with a bump structure, and the boss structure is riveted and fixed after passing through the corresponding through hole structure. Specifically, the left magnetic yoke 6 and the right magnetic yoke 5 are respectively provided with a first through hole 190 serving as a through hole structure, the two ends of the iron core 4 are respectively provided with a first boss 19 serving as a boss structure, and the first bosses 19 at the two ends of the iron core 4 respectively penetrate through the first through holes 190 on the left magnetic yoke 6 and the right magnetic yoke 5 and then are riveted and fixed. The outer sides of the two fixing legs 114 of the heating element 11 are respectively provided with a third boss 116 as a boss structure, the left magnetic yoke 6 and the right magnetic yoke 5 are respectively provided with a third through hole 117 as a through hole structure corresponding to the third boss 116, and the third bosses 116 are riveted and fixed after passing through the corresponding third through holes 117.

Further, boss structures are respectively arranged on the left magnetic yoke 6 and the right magnetic yoke 5, through hole structures corresponding to the boss structures are respectively arranged on the left side plate 8 and the right side plate 9, and the boss structures penetrate through the corresponding through hole structures and then are riveted and fixed. Specifically, the outer sides of the left magnetic yoke 6 and the right magnetic yoke 5 are respectively provided with three second bosses 18 serving as boss structures, the left side plate 8 and the right side plate 9 are respectively provided with three second through holes 180 serving as through hole structures and corresponding to the second bosses 18, and the second bosses 18 on the outer sides of the left magnetic yoke 6 and the right magnetic yoke 5 respectively penetrate through the corresponding second through holes 180 and then are riveted and fixed. It can be understood that the number and the shape of the first boss 19, the second boss 18 and the third boss 116 are not limited to those shown in the figures, the number and the shape of the first boss 19, the second boss 18 and the third boss 116 can be adjusted, and the number and the shape of the first through hole 190, the second through hole 180 and the third through hole 117 are correspondingly matched, so that the use of screws and rivets can be reduced, and the assembly difficulty can be reduced.

The assembly process of the thermo-electromagnetic release of the present embodiment is:

the connecting plate 1 is welded with one end of the lead group 2 firstly, so that the heat shrinkable tube 3 is heated to wrap the iron core 4 and then penetrates through the lead group 2 and the insulating component 7, the heating element 11 and the bimetallic strip 13 are riveted through the conductive piece 12, the left magnetic yoke 6 and the right magnetic yoke 5 are respectively installed on the heating element 11, the armature 15 is installed on the left side plate 8 and the right side plate 9, the clamping is required to be in place when the salient point 151 and the groove 22 are assembled, and finally the connecting plate is respectively connected with the left magnetic yoke and the armature 15 through the spring 10. The bimetallic strip 13 of the embodiment can make full use of the structural characteristics of other parts, and shunts the large current on the bimetallic strip 13 during breaking, thereby avoiding the bimetallic strip 13 from being ablated, simultaneously giving consideration to the direct-heating type bimetallic strip and the heating of the indirectly-heating type thermal element, and ensuring the reliability of the delayed action of the product.

As shown in fig. 7-8, in the drawings, a1-a4 represents the current flowing in the heating element 11, B1-B4 represents the newly added parallel circuit, and since the resistance of the heating element 11 is small, most of the current flows in the direction of a1-a4, and the smaller part of the current flows in the direction of B1-B4. Referring to fig. 7, the current a1 flows in the heating element 11 and the bimetal 13 in two directions, i.e. a2 and B1, starting from the left-hand spacer 110 in parallel, the current in the heating element 11 passes through a2-a4 in sequence, passes through B1-B4 in sequence with the bimetal 13, and finally converges to a current a5-a6 at the soft connection 16. The heating element 11 and the bimetallic strip 13 are both U-shaped, so that the sectional area of a conductor can be reduced, the current flowing path is long, the heating amount can be effectively increased, and the problem of insufficient heating of a small-ampere current is solved.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A thermo-electromagnetic release, comprising: including the support and install coil pack and the heating element on the support respectively, the heating element includes heating element (11) and bimetallic strip (13), and heating element (11) are connected with coil pack electricity, and bimetallic strip (13) are parallelly connected with heating element (11) through electrically conductive piece (12).

2. The thermo-electromagnetic release of claim 1, wherein: the bimetal sheet comprises at least two bimetal strips (132) arranged at intervals, one ends of the at least two bimetal strips (132) are connected together through a bimetal connecting sheet (133), and the other ends of the at least two bimetal strips (132) are respectively fixed on the heating element (11) through conductive pieces (12).

3. The thermo-electromagnetic release of claim 2, wherein: bimetallic strip (13) integrated into one piece is U type structure, and the middle part of bimetallic strip (13) is equipped with fluting (131), and bimetallic strip (13) are including relative two bimetallic strips (132) that set up in fluting (131) both sides to and connect bimetallic strip (133) between two bimetallic strips (132) one end, and the other end of two bimetallic strips (132) is fixed on heating element (11) through electrically conductive piece (12) respectively.

4. The thermo-electromagnetic release of claim 1, wherein: heating element (11) are including heating portion and fixed part, heating portion with bimetallic strip (13) are the U font structure respectively, and the both ends of heating portion and bimetallic strip (13) link to each other respectively, and the other part interval of heating portion and bimetallic strip (13) sets up, and the one end and the fixed part of heating portion are connected, and the other end and the fixed part interval of heating portion set up.

5. The thermo-electromagnetic release of claim 4, wherein: the heating portion is equipped with second fluting (111), the heating portion is including setting up two heating strip (112) in second fluting (111) both sides relatively, and connect heating plate (113) between two heating strip (112) one end, the other end of one of them heating strip (112) is connected with the one end and the fixed part of bimetallic strip (13) respectively, the other end of another heating strip (112) is connected with the one end of bimetallic strip (13), and set up with the fixed part interval, the one end that two heating strip (112) and heating plate (113) link to each other is bent to the one side of keeping away from bimetallic strip (13) respectively, form interval groove (110) between heating element (11) and bimetallic strip (13).

6. The thermo-electromagnetic release of claim 1, wherein: still including rotating armature (15) of installing on the support, coil pack includes insulating assembly (7) and sets up wire group (2) in insulating assembly (7), is equipped with iron core (4) in the inboard of wire group (2), and wire group (2) one end is connected with connecting plate (1), and the other end passes through flexible coupling (16) to be connected on heating element (11) and the part that bimetallic strip (13) interval set up.

7. The thermo-electromagnetic release of claim 6, wherein: the support is including relative left side board (8) and the right side board (9) that sets up, and there are left yoke (6) and right yoke (5) at the inboard fixed mounting respectively of left side board (8) and right side board (9), and left yoke (6) and right yoke (5) set up the both sides at coil pack relatively.

8. The thermo-electromagnetic release of claim 6, wherein: the inner side of the lead group (2) is provided with a heat shrinkable tube (3) arranged on the iron core (4).

9. The thermo-electromagnetic release of claim 7, wherein: the both sides of armature (15) are equipped with bump (151) respectively, the top side of left side board (8) and right side board (9) is equipped with recess (22) that are U type structure respectively, and bump (151) can insert recess (22) internal rotation of left side board (8) and right side board (9) that correspond respectively, and left side board (8) and right side board (9) are equipped with spacing portion (23) that are used for spacing armature (15) respectively in the side that is close to armature (15).

10. The thermo-electromagnetic release of claim 7, wherein: the iron core (4) and/or the heating element (11) are/is provided with boss structures respectively, the left magnetic yoke (6) and the right magnetic yoke (5) are provided with through hole structures corresponding to the boss structures respectively, and the boss structures penetrate through the corresponding through hole structures and then are riveted and fixed.

11. The thermo-electromagnetic release of claim 7, wherein: and boss structures are respectively arranged on the left magnetic yoke (6) and the right magnetic yoke (5), through hole structures corresponding to the boss structures are respectively arranged on the left side plate (8) and the right side plate (9), and the boss structures penetrate through the corresponding through hole structures and then are riveted and fixed.