CN210129473U

CN210129473U - Thermal overload alarm non-tripping device of molded case circuit breaker

Info

Publication number: CN210129473U
Application number: CN201921313146.6U
Authority: CN
Inventors: 唐维春; 吴佳; 顾建青
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2020-03-06
Anticipated expiration: 2029-08-14

Abstract

A thermal overload alarm non-tripping device of a molded case circuit breaker belongs to the technical field of low-voltage electrical appliances. Including support, bimetallic strip subassembly, rotationally set up traction lever, the alarm switch of fixed mounting on the support and the reset spring that acts on the traction lever on the support, characteristics: a trigger block for triggering the alarm switch is arranged on the draw bar corresponding to the alarm switch, and when the circuit breaker does not run in an overload state, the return spring pulls the draw bar to enable the trigger block to actuate the alarm switch to enable the alarm switch to be in a first state; when the circuit breaker is in an overload condition, the bimetallic strip assembly drives the traction rod to rotate, and after the traction rod rotates for a certain angle, the triggering block releases the alarm switch to enable the alarm switch to be switched to a second state, so that an overload alarm signal is output. The advantages are that: the structure is simple, the risk of damage of the bimetallic strip is reduced, and the reliability of the circuit breaker is improved.

Description

Thermal overload alarm non-tripping device of molded case circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to moulded case circuit breaker's thermal overload is reported to police and is not trip gear.

Background

With the continuous development of low-voltage electrical appliances, the market demand for low-voltage circuit breakers is increasing. The low-voltage circuit breaker is an important component of a low-voltage apparatus, and is mainly used for various protections such as overload and short circuit for a distribution system, electrical equipment and the like. In some special places, such as fire fighting, chemical engineering, medical treatment and the like, when the circuit is overloaded for a long time, the circuit is required not to be cut off, only an alarm signal is allowed to be output, and at the moment, a thermal overload alarm non-tripping device is used. The conventional thermal overload alarm non-tripping device of the molded case circuit breaker generally drives the traction rod to rotate through the heated and bent bimetallic element, so as to trigger the micro switch and output an alarm signal. The rotation direction of the traction rod is usually towards the direction close to the micro switch, and when the micro switch is triggered, the bimetallic element cannot drive the traction rod to continue rotating. When the circuit breaker is overloaded for a long time, the microswitch can prevent the bimetal element from bending and deforming, thereby causing damage to the bimetal element.

In view of the above-mentioned prior art, there is a need for a reasonable improvement of the structure of the thermal overload alarm trip gear of the existing molded case circuit breaker. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

Disclosure of Invention

The utility model aims to provide a moulded case circuit breaker's that simple structure, reliability are high thermal overload warning does not trip gear, and it can realize that alarm device is triggered the back, and bimetallic strip continues to drive the traction lever and rotates, avoids bimetallic element to cause the damage.

The utility model discloses a task is accomplished like this, a thermal overload warning of moulded case circuit breaker does not trip gear, including support, bimetallic strip subassembly, rotationally set up the traction lever on the support, the alarm switch of fixed mounting on the support and act on the reset spring on the traction lever, be provided with the trigger block that is used for triggering the alarm switch on the traction lever corresponding to the alarm switch, when the circuit breaker is not overloaded the operation, reset spring pulling traction lever make trigger block actuate the alarm switch and make the alarm switch be in the first state; when the circuit breaker is in an overload condition, the bimetallic strip assembly drives the traction rod to rotate, and after the traction rod rotates for a certain angle, the triggering block releases the alarm switch to enable the alarm switch to be in a second state, so that an overload alarm signal is output.

In a specific embodiment of the present invention, the traction rod is provided with more than one connecting portion at regular intervals, and the connecting portion is provided with a U-shaped groove with an upward opening.

In another specific embodiment of the present invention, the bimetal assembly comprises a bimetal and an adjusting screw, one end of the adjusting screw is installed at the upper end of the bimetal, and the other end of the adjusting screw is in transmission connection with the U-shaped groove of the traction rod.

In another specific embodiment of the present invention, the bimetal piece has a threaded hole, the adjusting screw comprises a screw rod and a screw head located at one end of the screw rod, one end of the screw rod is screwed into the threaded hole, and the other end of the screw rod is clamped into the U-shaped groove of the traction rod, so that the bimetal piece and the screw head are respectively located at two sides of the U-shaped groove.

In another specific embodiment of the present invention, the support is provided with a spring connecting post, the connecting portion of the traction rod is provided with a spring connecting portion, the one end of the return spring is connected with the spring connecting post of the support, and the other end is connected with the spring connecting portion of the traction rod.

In still another specific embodiment of the present invention, the spring connecting post is provided with a mounting groove, and one end of the return spring is hung on the mounting groove.

In yet another specific embodiment of the present invention, the spring connecting portion has a hanging hole, and the other end of the return spring is hung on the hanging hole.

In a more specific embodiment of the present invention, the drawbar has a first mounting shaft and a second mounting shaft extending to both sides, and the bracket has a first shaft hole for the first mounting shaft to be pivotally mounted and a second shaft hole for the second mounting shaft to be pivotally mounted.

In yet another specific embodiment of the present invention, the first guide groove and the second guide groove for guiding the draw bar to be loaded into are respectively disposed on the inner sides of the corresponding first shaft hole and the second shaft hole of the bracket.

The utility model discloses a still more and a concrete embodiment, the middle part of support is provided with the mount pad that supplies alarm switch to install, the mount pad include mounting hole and boss, when alarm switch installs on the support, alarm switch's first locating hole is passed to the boss of support, passes through the screw-fastening after mounting hole on the support aligns with alarm switch's second locating hole.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: under the condition that the circuit breaker is overloaded and triggers alarm, the rotation direction of the traction rod rotates towards the direction far away from the alarm device, after the alarm device is triggered, the bimetallic strip can continue to drive the traction rod to rotate until the fault is relieved, and the bimetallic strip and the traction rod are restored to the original positions.

Drawings

Fig. 1 is a schematic structural view of the thermal overload alarm non-tripping device of the present invention.

Fig. 2 is a schematic structural view of the traction rod of the present invention.

Fig. 3 is a schematic view of a side structure of the bracket of the present invention.

Fig. 4 is a schematic view of the other side structure of the bracket of the present invention.

Fig. 5 is a schematic structural view of the bimetal block assembly of the present invention.

Fig. 6 is a schematic structural diagram of the alarm switch of the present invention.

In the figure: 1. the spring mounting structure comprises a support, 11 spring connecting columns, 111 mounting grooves, 12 mounting holes, 13 bosses, 14 first shaft holes, 141 first guide grooves, 15 second shaft holes and 151 second guide grooves; 2. the device comprises a traction rod, 21 trigger blocks, 22 connecting parts, 221U-shaped grooves, 23 first mounting shafts, 24 second mounting shafts, 25 spring connecting parts and 251 hanging holes; 3. the bimetallic strip assembly, 31, the bimetallic strip, 311, a threaded hole, 32, an adjusting screw, 321, a screw rod, 322, a screw head; 4. the alarm switch, 41, the conversion part, 42, the first positioning hole, 43, the second positioning hole; 5. a return spring.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

As shown in fig. 1 to 6, the utility model relates to a thermal overload alarm trip gear of a molded case circuit breaker, the overload alarm trip gear include support 1, traction lever 2, bimetallic strip assembly 3, alarm switch 4 and reset spring 5. The draw bar 2 is rotationally arranged on the bracket 1, the bimetallic strip assembly 3 is arranged in the bracket 1, the alarm switch 4 is arranged on the bracket 1 and is positioned below the draw bar 2, and a trigger block 21 for triggering the alarm switch 4 is arranged on the draw bar 2 corresponding to the alarm switch 4. The return spring 5 is connected with the bracket 1 and the traction rod 2. When the circuit breaker does not run in an overload state, the return spring 5 pulls the traction rod 2 to enable the trigger block 21 to actuate the alarm switch 4 to enable the alarm switch 4 to be in a first state; when the circuit breaker is in an overload condition, the bimetallic strip assembly 3 drives the traction rod 2 to rotate, and after the traction rod 2 rotates for a certain angle, the triggering block 21 releases the alarm switch 4 to enable the alarm switch 4 to be switched to a second state, so that an overload alarm signal is output.

With continuing to read fig. 1 to fig. 6, the drawbar 2 has a first mounting shaft 23 and a second mounting shaft 24 extending to both sides, the bracket 1 is provided with a first shaft hole 14 for pivotally mounting the first mounting shaft 23 and a second shaft hole 15 for pivotally mounting the second mounting shaft 24, and the drawbar 2 is rotatably disposed on the first shaft hole 14 and the second shaft hole 15 of the bracket 1 through the first mounting shaft 23 and the second mounting shaft 24 at both ends. In this embodiment, the traction rod 2 is provided with three connecting portions 22 at regular intervals, and the connecting portions 22 are provided with U-shaped grooves 221 with upward openings. The bimetal block assembly 3 comprises a bimetal 31 and an adjusting screw 32, and the adjusting screw 32 is installed at the upper end of the bimetal 31 and extends outwards to be in transmission connection with a U-shaped groove 221 of the traction rod 2. The middle of the bracket 1 is provided with a mounting seat for mounting the alarm switch 4, and in the embodiment, the mounting seat comprises a mounting hole 12 and a boss 13. When the alarm switch 4 is installed on the bracket 1, the boss 13 of the bracket 1 penetrates through the first positioning hole 42 of the alarm switch 4, and the installation hole 12 on the bracket 1 is aligned with the second positioning hole 43 of the alarm switch 4 and then is fastened through a screw. The return spring 5 provides a return force for the traction rod 2, one end of the return spring 5 is connected with the bracket 1, and the other end of the return spring is connected with the traction rod 2. In this embodiment, a spring connecting column 11 is additionally arranged on the bracket 1, and a mounting groove 111 is formed on the spring connecting column 11; the connecting part 22 of the traction rod 2 is provided with a spring connecting part 25, the spring connecting part 25 is provided with a hanging hole 251, one end of the return spring 5 is hung on the mounting groove 111 of the bracket 1, and the other end is hung on the hanging hole 251 of the traction rod 2.

With continuing to read fig. 1 to fig. 6, the bracket 1 is provided with a first guide groove 141 and a second guide groove 151 respectively corresponding to the first shaft hole 14 and the second shaft hole 15, and when the first mounting shaft 23 and the second mounting shaft 24 at the two ends of the drawbar 2 are respectively and correspondingly installed in the first shaft hole 14 and the second shaft hole 15 at the two sides of the bracket 1, the first mounting shaft 23 and the second mounting shaft 24 firstly abut against the first guide groove 141 and the second guide groove 151 on the bracket 1, and are installed by guiding deformation of the first guide groove 141 and the second guide groove 151, until the first mounting shaft 23 and the second mounting shaft 24 are respectively inserted into the first shaft hole 14 and the second shaft hole 15, the bracket 1 is deformed, and the drawbar 2 can rotate and cannot be separated from the installation position after being installed in the bracket 1. After the traction rod 2 is installed in the bracket 1, one end of the return spring 5 is hung on the installation groove 111 of the bracket 1, and the other end is hung on the hanging hole 251 of the traction rod 2, so that the traction rod 2 is kept at the installation position. The bimetal block 3 is installed in the position corresponding to each phase of the circuit breaker in the rack 1, the bimetal 31 on the bimetal block 3 has a threaded hole 311, and the adjusting screw 32 is composed of a screw rod 321 and a screw head 322 at one end of the screw rod 321. One end of the screw rod 321 is screwed into the threaded hole 311, and the other end is clamped into the U-shaped groove 221 of the drawbar 2, so that the bimetal 31 and the screw head 322 are respectively positioned at two sides of the U-shaped groove 221. The thermal deformation of the bimetal 31 can drive the screw head 322, thereby driving the traction rod 2 to rotate.

Referring to fig. 1 to fig. 6, the operating principle of the thermal overload alarm trip gear of the molded case circuit breaker of the present invention is as follows: specifically, as shown in fig. 6, the alarm switch 4 is a microswitch, the microswitch has a conversion part 41, when the circuit breaker is not in overload operation, the trigger block 21 of the traction rod 2 actuates the conversion part 41 of the microswitch due to the acting force of the return spring 5, in this embodiment, the trigger block 21 of the traction rod 2 is pressed on the conversion part 41 of the microswitch, and the microswitch is in a first state, that is, the output signal of the microswitch is a normally open signal; when the circuit breaker is in an overload condition, namely when the actual current in a circuit is greater than the rated current, the bimetallic strip 31 is heated and deformed to bend towards the traction rod 2, the adjusting screw 32 drives the traction rod 2 to overcome the spring force of the return spring 5 to rotate, and when the traction rod 2 rotates for a certain angle, the trigger block 21 releases the conversion part 41, so that the micro switch is converted into a second state, namely the output signal of the micro switch is converted from a normally open signal into a normally closed signal, and the micro switch outputs an overload alarm signal. And after the micro switch is switched, the traction rod 2 can continue to rotate under the driving of the bimetallic strip 31. When the fault is cleared, the bimetallic strip 31 automatically resets, the traction rod 2 is restored to the initial position under the action of the return spring 5, the trigger block 21 is also restored to the initial position, at the moment, the trigger block 21 actuates the conversion part 41 of the microswitch, and the microswitch is in the first state, namely the output signal of the microswitch is converted from the normally closed signal to the normally open signal.

Claims

1. The utility model provides a moulded case circuit breaker's hot overload warning does not trip gear, includes support (1), bimetallic strip subassembly (3), rotationally sets up traction lever (2) on support (1), alarm switch (4) and reset spring (5) of being used in on traction lever (2) of fixed mounting on support (1), its characterized in that: a trigger block (21) for triggering the alarm switch (4) is arranged on the draw bar (2) corresponding to the alarm switch (4), and when the circuit breaker does not run in an overload state, the return spring (5) pulls the draw bar (2) to enable the trigger block (21) to actuate the alarm switch (4) so as to enable the alarm switch (4) to be in a first state; when the circuit breaker is in an overload condition, the bimetallic strip assembly (3) drives the traction rod (2) to rotate, and after the traction rod (2) rotates for a certain angle, the triggering block (21) releases the alarm switch (4) to enable the alarm switch (4) to be switched to a second state, so that an overload alarm signal is output.

2. The thermal overload alarm non-tripping device of the molded case circuit breaker according to claim 1, wherein the draw bar (2) is provided with more than one connecting portion (22) at regular intervals, and the connecting portion (22) is provided with a U-shaped groove (221) with an upward opening.

3. The thermal overload alarm trip gear of the molded case circuit breaker according to claim 2, wherein the bimetal block assembly (3) comprises a bimetal (31) and an adjusting screw (32), one end of the adjusting screw (32) is installed at the upper end of the bimetal (31), and the other end is in transmission connection with the U-shaped groove (221) of the draw bar (2).

4. The thermal overload alarm trip device of the molded case circuit breaker according to claim 3, wherein the bimetal (31) has a threaded hole (311), the adjusting screw (32) is composed of a screw rod (321) and a screw head (322) at one end of the screw rod (321), one end of the screw rod (321) is screwed in the threaded hole (311), and the other end is inserted into the U-shaped groove (221) of the draw bar (2), so that the bimetal (31) and the screw head (322) are respectively located at two sides of the U-shaped groove (221).

5. The thermal overload alarm non-tripping device of the molded case circuit breaker according to claim 2, wherein the bracket (1) is provided with a spring connecting post (11), the connecting portion (22) of the traction rod (2) is provided with a spring connecting portion (25), one end of the return spring (5) is connected with the spring connecting post (11) of the bracket (1), and the other end is connected with the spring connecting portion (25) of the traction rod (2).

6. The thermal overload alarm trip gear of the molded case circuit breaker as claimed in claim 5, wherein the spring connection post (11) is formed with a mounting groove (111), and one end of the return spring (5) is hung on the mounting groove (111).

7. The thermal overload alarm trip gear of the molded case circuit breaker as claimed in claim 5, wherein the spring connecting portion (25) is formed with a hanging hole (251), and the other end of the return spring (5) is hung on the hanging hole (251).

8. The thermal overload alarm trip gear of the molded case circuit breaker according to claim 1, wherein the draw bar (2) has a first mounting shaft (23) and a second mounting shaft (24) extending to both sides, and the bracket (1) is provided with a first shaft hole (14) for pivotally mounting the first mounting shaft (23) and a second shaft hole (15) for pivotally mounting the second mounting shaft (24).

9. The thermal overload alarm trip gear of the molded case circuit breaker according to claim 8, wherein the bracket (1) is formed with a first guide groove (141) and a second guide groove (151) for guiding the draw bar (2) to be inserted therein, respectively, at inner sides corresponding to the first shaft hole (14) and the second shaft hole (15).

10. The thermal overload alarm trip gear of the molded case circuit breaker according to claim 1, wherein the middle of the bracket (1) is provided with a mounting seat for mounting the alarm switch (4), the mounting seat comprises a mounting hole (12) and a boss (13), when the alarm switch (4) is mounted on the bracket (1), the boss (13) of the bracket (1) passes through the first positioning hole (42) of the alarm switch (4), and the mounting hole (12) of the bracket (1) is aligned with the second positioning hole (43) of the alarm switch (4) and then fastened by a screw.