Molded case circuit breaker with overload alarm non-tripping device

Abstract

The utility model relates to a molded case circuit breaker with an overload alarm non-tripping device, which comprises a shell, the interior of the shell is divided into three movable areas by partition plates, each movable area is internally provided with a bimetallic strip, a moving contact and a static contact, and the moving contact is connected with the bimetallic strip. A support is arranged in the shell and located above the partition plate, the support is located on the sides, away from the moving contact, of the bimetallic strips, a traction rod and a microswitch are arranged on the support, the microswitch is arranged on one side of the traction rod, and the upper end of the traction rod is connected with the bimetallic strips through connecting pieces. The traction rod is arranged on the support so as to drive the traction rod to rotate on the support when any bimetallic strip deforms, an abutting block is arranged at the position, corresponding to the microswitch, of the lower end of the traction rod, and when the upper end of the traction rod rotates towards the bimetallic strips, the abutting block touches and presses an elastic piece of the microswitch so as to trigger the microswitch. By adopting the above technical scheme, the molded case circuit breaker with the overload alarm non-tripping device provided by the utility model has the advantages of simple structure and convenient and fast disassembly and assembly, and can realize alarm non-tripping only by arranging one draw bar and the microswitch.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of molded case circuit breaker, especially to a molded case circuit breaker with overload alarm undropping device. BACKGROUND

[0002] Circuit breaker is an important part of electrical industry, which has been widely used. When the circuit works normally, the circuit breaker can achieve power-off, power supply and circuit conversion by closing or opening the circuit supplying power. When the circuit has overload, voltage loss, undervoltage or short circuit fault, the circuit breaker can automatically cut off the circuit to avoid endangering the safety of workers and the normal operation of equipment. Generally, the circuit breaker can automatically open the circuit within a specified time when overload or short circuit occurs in the circuit to protect the electrical equipment. However, if the circuit breaker automatically cuts off the circuit due to overload in the circuit, it may cause significant economic loss in important power distribution lines. Therefore, the circuit breaker needs to issue an alarm instead of automatically cutting off the circuit when overload occurs in the circuit, so that the user can quickly eliminate the fault in the circuit, thereby avoiding economic loss caused by sudden disconnection of the circuit.

[0003] There is a kind of overload alarm undropping device of circuit breaker in a granted patent with the patent number CN107154325B, which includes bimetallic strip with variable deformation amount changing with temperature, heating element for heating bimetallic strip, micro switch for outputting alarm signal and alarm rod fixed on bimetallic strip. One end of the alarm rod is connected with the bimetallic strip, and the other end is correspondingly arranged with the micro switch corresponding to the bimetallic strip. When the overload current in the circuit reaches the setting value, the bimetallic strip is heated by the heating element to produce sufficient deformation to drive the alarm rod to approach and trigger the micro switch. The alarm rod includes an insulating sleeve installed on one end of the bimetallic strip and a pull rod installed on the other end of the insulating sleeve. The first end of the pull rod is connected with the insulating sleeve, and the other end is matched with the micro switch.

[0004] The above device has a complex structure. The alarm rod needs to trigger the micro switch through the pull rod. When three sets of bimetallic strips are arranged, three alarm rods and three micro switches are correspondingly arranged, which leads to a complex overall structure, numerous components, troublesome assembly and high cost. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of molded case circuit breakers with overload alarm undropping device, structure is simple and convenient, dismounting is convenient and fast, only need to set one traction rod and micro switch to realize alarm undropping.

[0006] The utility model discloses a technical scheme: a moulded case circuit breaker with overload alarm undropping device, including the casing, the casing is separated into three movable areas through the partition, and is equipped with bimetallic strip, movable contact and static contact in each movable area, movable contact is connected with bimetallic strip, the casing is equipped with the support in the top of partition, and the support is located in the side of bimetallic strip away from movable contact, be equipped with traction rod and micro -switch on the support, and micro -switch is located in the one side of traction rod, the upper end of traction rod is connected with each bimetallic strip through the connecting piece, drives the traction rod to rotate on the support when any one bimetallic strip is deformed, the lower end of traction rod is equipped with the pressure block corresponding micro -switch position, and the upper end of traction rod rotates to bimetallic strip direction, and the spring of micro -switch is pressed to trigger micro -switch when the pressure block.

[0007] Adopt the above technical scheme, and the traction rod is connected with each bimetallic strip through the connecting piece, and when any one bimetallic strip is deformed due to overload, can drive the traction rod to rotate, thereby can trigger micro -switch to send alarm, and the connecting line is equipped on micro -switch, and because it is stretched out from the casing, after the trouble is removed, the spring of micro -switch can reset the traction rod and bimetallic strip, and the structure is simple, and only needs to set up a micro -switch.

[0008] The utility model further provides: the support is equipped with the installation cavity, the micro -switch is equipped in the installation cavity, and the installation cavity is equipped with the first elastic clamping hook, and the first elastic clamping hook is hooked on the micro -switch.

[0009] Adopt the above further setting, and the micro -switch structure is stable, is not influenced by the rotation of traction rod, makes the spring of micro -switch always correspondingly set with the pressure block, and the micro -switch is convenient and quick to dismount, and can be directly taken out or installed, need not utilize other tools to dismount, and is convenient for maintenance replacement.

[0010] The utility model further provides: the support is equipped with the concave cavity, and the traction rod is located in the concave cavity, and the bottom of concave cavity is arc -shaped setting, and the support is further equipped with the second elastic clamping hook, and the second elastic clamping hook is hooked on the traction rod.

[0011] Adopt the above further setting, and the traction rod is convenient and quick to dismount, need not adopt the tool to realize quick dismounting, and the second elastic clamping hook can be positioned up and down to the traction rod, avoids its rotation and separates the support, and arc -shaped setting is adapted to the traction rod, makes the traction rod rotate more smoothly.

[0012] The utility model further provides: the concave cavity is equipped with two, and is located at the both ends of support respectively, and the traction rod is equipped with two limit plates, and when the traction rod is installed in the concave cavity, two limit plates abut on the lateral wall of concave cavity.

[0013] With the further setting, the axial sliding of the traction rod can be limited, and the traction rod can only rotate in the circumferential direction, so that the traction rod is prevented from deviating and affecting the position of the abutting block and the micro switch, and the micro switch cannot be triggered.

[0014] The further setting of the utility model discloses: the connecting piece adopts screw setting, each bimetallic sheet is equipped with threaded hole, the traction rod is equipped with the connecting piece on the position corresponding to each metal sheet, each connecting piece is equipped with through -hole, and one end is passed through threaded hole and is screwed with the threaded hole, and the other end is located the side of connecting piece far away from bimetallic sheet, and when bimetallic sheet is deformed, drive the traction rod to rotate.

[0015] With the further setting, the connection is convenient, when any one bimetallic sheet is deformed due to overload, the screw connected with it is driven to move, the other end of the screw is in contact with the connecting piece, and in the process of continuous movement of the screw, the traction rod is driven to rotate on the support, and the abutting block on the traction rod can press the elastic sheet to trigger the micro switch, so that the alarm can be sent without tripping.

[0016] The further setting of the utility model discloses: the two partition plates are integrally formed with connecting chambers on the opposite side walls, the support is provided with a counterbore, the counterbore is correspondingly arranged with the connecting chamber, and a fastener is arranged through the counterbore to connect the support and the shell.

[0017] With the further setting, the connection structure is simple, convenient and fast to disassemble and assemble, and the overload alarm and non-tripping device can be disassembled when not in use, and the use of the circuit breaker is not affected.

[0018] The further setting of the utility model discloses: still include the reset spring for the traction rod upper end to the support direction reset, the support is equipped with the positioning piece, the reset spring one end is hooked on one connecting piece, and the other end is hooked on the positioning piece.

[0019] With the further setting, the reset force of the traction rod is improved, and the reset of the micro switch elastic sheet is avoided, which can easily lead to incomplete reset. ACCURACY OF DRAWINGS

[0020] Figure 1 It is the structure schematic drawing of the embodiment of the utility model;

[0021] Figure 2 It is the internal schematic diagram of the embodiment of the utility model;

[0022] Figure 3 It is the schematic diagram of bimetallic sheet and movable contact of the embodiment of the utility model;

[0023] Figure 4 It is the schematic diagram of bimetallic sheet and traction rod of the embodiment of the utility model;

[0024] Figure 5 Figure 1 is a schematic view of a traction rod and a bracket according to an embodiment of the present application;

[0025] Figure 6 Figure 2 is a schematic view of a traction rod according to an embodiment of the present application;

[0026] Figure 7 Figure 3 is a schematic view of a bracket according to an embodiment of the present application;

[0027] Figure 8 Figure 4 is a schematic view of a micro switch according to an embodiment of the present application;

[0028] Figure 9 Figure 5 is a schematic view of a shell according to an embodiment of the present application;

[0029] Figure 10 Figure 6 is a schematic view of a circuit breaker according to another embodiment of the present application;

[0030] Figure 11 Figure 7 is a schematic view of a traction rod and a bimetal according to another embodiment of the present application;

[0031] Figure 12 Figure 8 is a schematic view of a bracket according to another embodiment of the present application;

[0032] Figure 13 Figure 9 is a schematic view of a shell according to another embodiment of the present application.

[0033] In the figure, 1 is a shell; 11 is a movable area; 2 is a partition plate; 21 is a connecting chamber; 22 is an opening; 23 is a guide groove; 3 is a bimetal; 31 is a threaded hole; 4 is a movable contact; 5 is a bracket; 51 is a counterbore; 52 is a mounting cavity; 521 is a first elastic clamping hook; 53 is a concave cavity; 54 is a second elastic clamping hook; 55 is a positioning sheet; 551 is a connecting hole; 56 is a guide strip; 6 is a traction rod; 61 is a pressing block; 62 is a limiting plate; 63 is a connecting sheet; 631 is a through hole; 7 is a micro switch; 71 is a spring sheet; 8 is a connecting piece; 9 is a reset spring. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0035] It should be noted that all directional indicators (such as up, down, forward, backward, etc.) in the description of this utility model are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] like Figures 1-13 As shown, a molded case circuit breaker with overload alarm and non-tripping device includes a housing 1. The housing 1 is divided into three movable areas 11 by a partition 2. Each movable area 11 is provided with a bimetallic strip 3, a moving contact 4, and a stationary contact. The moving contact 4 is connected to the bimetallic strip 3, and the stationary contact is arranged opposite to the moving contact. This part of the structure and the rest of the circuit breaker structure are all prior art and are not the innovation of this utility model, so they will not be described in detail. A bracket 5 is provided above the partition 2 inside the housing 1. The bracket 5 is located on the side of the bimetallic strip 3 away from the moving contact 4. A traction rod 6 and a micro switch 7 are provided on the bracket 5. The micro switch 7 is located on one side of the traction rod 6. The upper end of the traction rod 6 is connected to each bimetallic strip 3 through a connector 8. The connection allows the traction rod 6 to rotate on the bracket 5 when any one of the bimetallic strips 3 deforms. The lower end of the traction rod 6 is provided with a pressing block 61 corresponding to the position of the micro switch 7. When the upper end of the traction rod 6 rotates towards the bimetallic strip 3, the pressing block 61 presses the spring 71 of the micro switch 7 to trigger the micro switch 7. The traction rod 6 is connected to each bimetallic strip 3 through the connector 8. When any one of the bimetallic strips 3 deforms due to overload, the traction rod 6 can be driven to rotate, thereby triggering the micro switch 7 to issue an alarm. The micro switch 7 is provided with a connecting wire that extends out of the housing 1. After the fault is cleared, the traction rod 6 and the bimetallic strip 3 can be reset through the spring 71 of the micro switch 7. The structure is simple and only one micro switch 7 is required.

[0039] The bracket 5 is provided with a mounting cavity 52, the micro switch 7 is arranged in the mounting cavity 52, the mounting cavity 52 is provided with a first elastic hook 521, the first elastic hook 521 is arranged on the micro switch 7, the micro switch 7 is stable in structure and is not affected by the rotation of the traction rod 6, so that the elastic sheet 71 of the micro switch 7 is always arranged corresponding to the abutting block 61, and the micro switch 7 is convenient to disassemble and assemble, can be directly taken out or assembled, does not need to be disassembled and assembled by using other tools, is convenient to maintain and replace, the mounting cavity 52 can be arranged at two ends of the bracket 5 or arranged at the middle of the bracket 5, the first elastic hook 521 is arranged in two and oppositely arranged to form the side wall of the mounting cavity 52, when the micro switch 7 is disassembled, the first elastic hook 521 is elastically deformed, and the micro switch 7 is convenient to disassemble and assemble.

[0040] The bracket 5 is provided with a recess 53, the traction rod 6 is located in the recess 53, and the bottom of the recess 53 is arc-shaped, the bracket 5 is further provided with a second elastic hook 54, the second elastic hook 54 is arranged on the traction rod 6, the traction rod 6 is convenient to disassemble and assemble, and can be quickly disassembled and assembled without using tools, the second elastic hook 54 can limit the upper and lower positions of the traction rod 6, avoid the traction rod 6 from being separated from the bracket 5 when rotating, the arc-shaped arrangement is matched with the traction rod 6, and the traction rod 6 rotates more smoothly; the recess 53 is provided with two, and is located at two ends of the bracket 5, the traction rod 6 is provided with two limiting plates 62, when the traction rod 6 is mounted in the recess 53, the two limiting plates 62 abut on the outer side wall of the recess 53, can limit the axial sliding of the traction rod 6, so that the traction rod 6 can only rotate in the circumferential direction, avoids the traction rod 6 from deviating, and affects the positions of the abutting block 61 and the micro switch 7, so that the micro switch 7 cannot be triggered.

[0041] The connecting piece 8 is provided with a screw, each bimetallic strip 3 is provided with a threaded hole 31, the traction rod 6 is provided with a connecting piece 63 corresponding to each bimetallic strip, each connecting piece 63 is provided with a through hole 631, one end of the screw is screwed into the through hole 631 and the threaded hole 31, the other end is located on the side of the connecting piece 63 away from the bimetallic strip 3, and drives the traction rod 6 to rotate when the bimetallic strip 3 is deformed, and the connection is convenient, when any one bimetallic strip 3 is deformed due to overload, the screw connected with it moves, the other end of the screw moves and abuts against the connecting piece 63, and in the process of continuous movement of the screw, the traction rod 6 is driven to rotate on the bracket 5, the abutting block 61 on the traction rod 6 can abut against the elastic piece 71 to trigger the micro switch 7, and an alarm can be sent without tripping. It also includes a reset spring 9 for resetting the upper end of the traction rod 6 to the bracket 5, the bracket 5 is provided with a positioning piece 55, one end of the reset spring 9 is hooked on one of the connecting pieces 63, and the other end is hooked on the positioning piece 55, the reset force of the traction rod is improved, the reset of the elastic piece 71 of the micro switch 7 is avoided, and the reset is not easy to be in place, the connecting hole 551 can be provided on the connecting piece 63 and the positioning piece 55, and the end of the reset spring 9 is hooked in the connecting hole 551, the structure is firm and not easy to fall off.

[0042] The mounting mode of the bracket is one, the opposite side walls of the two partition plates 2 are integrally formed with connecting chambers 21, the bracket 5 is provided with a counterbore 51, the counterbore 51 is provided correspondingly with the connecting chamber 21, and a fastener is provided to connect the bracket 5 and the shell 1, the fastener can be provided with a screw, the connecting structure is simple, and the disassembly and assembly are convenient and fast, the overload alarm and non-tripping device can be disassembled when it is not needed, and the use of the circuit breaker is not affected.

[0043] The mounting mode of the bracket is two, as shown in Figures 10-13 The two partition plates 2 are provided with openings 22, the bracket 5 is mounted in the opening 22, the side wall of the partition plate 2 is provided with a guide groove 23 with an open upper end, the two side walls of the bracket 5 are provided with guide strips 56, the guide strips 56 are inserted into the guide groove 23, the bracket can be further fixed by a screw, and the mounting cavity is arranged at the middle position of the bracket.

Claims

1. A molded case circuit breaker with overload alarm trip device, comprising a housing (1), the housing (1) is divided into three movable areas (11) by a partition (2), each movable area (11) is provided with a bimetallic strip (3), a movable contact (4) and a static contact, the movable contact (4) is connected with the bimetallic strip (3), characterized in that, The shell (1) is provided with a support (5) above the partition plate (2), the support (5) is located on the side of the bimetallic strip (3) away from the moving contact (4), the support (5) is provided with a traction rod (6) and a micro switch (7), the micro switch (7) is located on the side of the traction rod (6), the upper end of the traction rod (6) is connected with each bimetallic strip (3) through a connecting piece (8), so as to drive the traction rod (6) to rotate on the support (5) when any one bimetallic strip (3) is deformed, the lower end of the traction rod (6) is provided with a pressing block (61) corresponding to the position of the micro switch (7), when the upper end of the traction rod (6) rotates towards the bimetallic strip (3), the pressing block (61) touches and presses the elastic sheet (71) of the micro switch (7) to trigger the micro switch (7).

2. The molded case circuit breaker with overload alarm trip unit of claim 1, wherein, The support (5) is provided with a mounting cavity (52), the micro switch (7) is arranged in the mounting cavity (52), and the mounting cavity (52) is provided with a first elastic hook (521), and the first elastic hook (521) is arranged on the micro switch (7).

3. The molded case circuit breaker with overload alarm trip unit according to claim 1 or 2, wherein The support (5) is provided with a recess (53), the traction rod (6) is located in the recess (53), and the bottom of the recess (53) is arc-shaped, the support (5) is further provided with a second elastic hook (54), and the second elastic hook (54) is arranged on the traction rod (6).

4. The molded case circuit breaker with overload alarm trip unit of claim 3, wherein, The recess (53) is provided with two, which are located at both ends of the support (5), the traction rod (6) is provided with two limiting plates (62), and when the traction rod (6) is installed in the recess (53), the two limiting plates (62) abut against the outer side wall of the recess (53).

5. The molded case circuit breaker with overload alarm trip unit of claim 1 or 2, wherein, The connecting piece (8) is provided with a screw, each bimetallic strip (3) is provided with a threaded hole (31), the connecting piece (8) is provided with a connecting piece (63) corresponding to each bimetallic strip (3), each connecting piece (63) is provided with a through hole (631), one end of the screw passes through the through hole (631) and is screwed with the threaded hole (31), and the other end is located on the side of the connecting piece (63) away from the bimetallic strip (3) and drives the traction rod (6) to rotate when the bimetallic strip (3) is deformed.

6. The molded case circuit breaker with overload alarm trip unit of claim 5 wherein, Further comprising a reset spring (9) for resetting the upper end of the traction rod (6) to the direction of the support (5), the support (5) is provided with a positioning piece (55), one end of the reset spring (9) is arranged on one of the connecting pieces (63), and the other end is arranged on the positioning piece (55).

7. The molded case circuit breaker with overload alarm trip unit of claim 1 or 2, wherein, The opposite side walls of the two partition plates (2) are integrally formed with a connecting cavity (21), the support (5) is provided with a counterbore (51), the counterbore (51) is correspondingly arranged with the connecting cavity (21), and a fastener is arranged to connect the support (5) and the shell (1).

8. The molded case circuit breaker with overload alarm trip unit of claim 1 or 2, wherein, The two partition plates (2) are provided with an opening (22), the support (5) is installed in the opening (22), the side wall of the partition plate (2) is provided with a guide groove (23) with an open upper end, the two side walls of the support (5) are provided with guide strips (56), and the guide strips (56) are inserted into the guide groove (23).

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