Overload alarm non-tripping structure applied to circuit breaker

Abstract

The utility model discloses an overload alarm non-tripping structure applied to a circuit breaker. The overload alarm non-tripping structure comprises a base, a middle cover and a cover cap, the cover cap is provided with an alarm assembly. The alarm assembly comprises a bimetallic strip, a heat conduction connecting rod, a microswitch, an alarm and a trigger piece. A mounting groove is formed in the cover cap; the microswitch is mounted in the mounting groove; one end of the bimetallic strip is fixed to the cover cap; one end of the heat-conducting connecting rod is fixedly connected to the other end of the bimetallic strip, and the other end of the heat-conducting connecting rod is connected with a thermal element mounted in the base; the trigger piece is installed on the heat conduction connecting rod and is driven by the bimetallic strip to move between a trigger position where the trigger piece abuts against the microswitch to trigger the microswitch and a disconnection position where the trigger piece is separated from the microswitch to close the microswitch. According to the overload alarm non-tripping structure applied to the circuit breaker, the power supply continuity is improved while the power utilization safety is ensured, the overall structure is designed in a modularized manner, the original design of the circuit breaker is not changed, the structure is simple, the installation is convenient, and the production cost is relatively low.

Description

Technical Field

[0001] The utility model relates to an overload alarm non-tripping structure applied to a circuit breaker. Background Art

[0002] Circuit breakers are an important part of the electrical industry, and their application scope is becoming wider and wider. In the application process of existing circuit breakers, when the circuit is overloaded, under-voltage, short-circuited, etc., the circuit breaker can disconnect the circuit to avoid the circuit failure endangering the safety of workers and electrical equipment. However, in the use of circuit breakers in special equipment such as fire protection, lighting and medical treatment, the circuit breaker needs to only alarm without disconnecting the circuit after overload, and realize the function of overload alarm without tripping, and the traditional circuit breaker structure cannot meet this demand. Utility Model Content

[0003] 1. Technical solution

[0004] In order to solve the above problems, the technical solution provided by the utility model is:

[0005] An overload alarm non-tripping structure applied to a circuit breaker comprises: a base, a middle cover and a cover; the cover is installed above the middle cover; the middle cover is installed above the base; the cover is installed with an alarm component for alarming without tripping when overloaded; the alarm component comprises: a bimetallic strip, a heat-conducting connecting rod, a micro switch, an alarm and a triggering member for triggering the micro switch; the cover is formed with a mounting groove; the micro switch is installed in the mounting groove; one end of the bimetallic strip is fixed to the cover; one end of the heat-conducting connecting rod is fixedly connected to the other end of the bimetallic strip and the other end thereof is connected to a thermal element installed in the base; the triggering member is installed on the heat-conducting connecting rod and, driven by the bimetallic strip, moves between a triggering position of resisting the micro switch to trigger the micro switch and a disconnecting position of disengaging the micro switch to close the micro switch; the alarm is installed in the base and is electrically connected to the micro switch through a wire.

[0006] Furthermore, the trigger member is a trigger screw; the trigger screw is detachably mounted on the other end of the heat-conducting connecting rod.

[0007] Furthermore, the heat-conducting connecting rod is composed of vertical rods located at both ends and a horizontal rod located in the middle; the two vertical rods are arranged in parallel and perpendicular to the horizontal rod; one of the two vertical rods is fixed to the bimetallic strip and is arranged in contact with the bimetallic strip; the trigger screw is detachably installed on the other of the two vertical rods and its installation direction is perpendicular to the vertical rod.

[0008] Furthermore, the trigger screw is adjustably installed in an adjustment hole formed in the other one of the two vertical rods through an adjustment nut.

[0009] Furthermore, the vertical rod connecting the bimetallic strip is formed with a wrapping portion for wrapping the side edge of the bimetallic strip.

[0010] Furthermore, one of the two vertical rods is fixedly connected to the bimetallic strip via a metal screw.

[0011] Furthermore, the cover is equipped with a plurality of alarm components; a plurality of thermal elements are arranged in the base; and the plurality of alarm components and the plurality of thermal elements are arranged in a one-to-one correspondence.

[0012] Furthermore, the cover is formed with a receiving groove for receiving the wire connecting the micro switch and the alarm; the middle cover is provided with a through hole for the wire to pass through to connect the alarm.

[0013] Furthermore, fixing holes for allowing a binding belt to pass through to confine the wire in the accommodating groove are respectively formed on both sides of the accommodating groove.

[0014] Furthermore, a plurality of supporting bosses are formed in the installation groove; threaded holes are formed in the supporting bosses; and the micro switch is fixed to the installation groove by screws being screwed into the threaded holes and the hole formed by the micro switch in sequence.

[0015] 2. Beneficial effects

[0016] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0017] The overload alarm non-tripping structure applied to the circuit breaker provided by the utility model directly installs a micro switch in the installation groove formed by the cover, and the micro switch is electrically connected to the alarm, and then through the cooperation of the bimetallic strip, the heat-conducting connecting rod and the thermal element, an alarm is promptly issued in case of overload without interrupting the power supply, while ensuring the safety of electricity use, the continuity of power supply is improved, the overall structure is modularly designed, the original design of the circuit breaker is not changed, the structure is simple, the installation is convenient, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an overload alarm non-tripping structure applied to a circuit breaker proposed in an embodiment of the utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the internal structure of the overload alarm non-tripping structure applied to the circuit breaker;

[0020] Figure 3 for Figure 1 A schematic diagram of a cover of an overload alarm non-tripping structure applied to a circuit breaker;

[0021] Figure 4 for Figure 1 A schematic diagram of a middle cover of an overload alarm non-tripping structure applied to a circuit breaker;

[0022] An overload alarm non-tripping structure 10 applied to a circuit breaker, a base 11, a cover 12, a mounting groove 121, a receiving groove 122, a fixing hole 123, a supporting boss 124, a threaded hole 125, an alarm component 13, a bimetallic strip 131, a heat-conducting connecting rod 132, a vertical rod 1321, a wrapping portion 1322, a horizontal rod 1323, a micro switch 133, an alarm (not shown), a trigger 134, a metal screw 135, a cover 14, a through hole 141, and a thermal element 15. DETAILED DESCRIPTION

[0023] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0024] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.

[0025] Example 1

[0026] like Figures 1 to 4As shown, an overload alarm non-tripping structure 10 applied to a circuit breaker of the utility model comprises: a base 11, a middle cover 14 and a cover 12. The base 11, the middle cover 14 and the cover 12 are components of the circuit breaker. When installing, the cover 12 is installed above the middle cover 14, and the middle cover 14 is installed above the base 11. As an improved structure of this scheme, an alarm component 13 is installed in the cover 12 for alarming and non-tripping when overloaded. The alarm component 13 comprises: a bimetallic strip 131, a heat-conducting connecting rod 132, a micro switch 133, an alarm and a triggering member 134 for triggering the micro switch 133. An installation groove 121 is formed on the cover 12, and the micro switch 133 is installed in the installation groove 121. The alarm is installed in the base 11 and is electrically connected to the micro switch 133 through a wire. Then, one end of the bimetal 131 is fixed to the cover 12, and one end of the heat-conducting connecting rod 132 is fixedly connected to the other end of the bimetal 131 and the other end thereof is connected to the thermal element 15, which is a component installed in the base 11 and is connected to the phase in the circuit breaker. Finally, the trigger 134 is installed on the heat-conducting connecting rod 132, so that the trigger 134, driven by the bimetal 131, will move between the trigger position of resisting the micro switch 133 to trigger the micro switch 133 and the disconnection position of disengaging from the micro switch 133 to close the micro switch 133.

[0027] Based on the above structure, when an overload current appears in the circuit connected to the circuit breaker, the current passes through the thermal element 15 to make the thermal element 15 heat up quickly, and the thermal element 15 transfers the heat to the bimetal 131 through the heat-conducting connecting rod 132. The high expansion surface of the bimetal 131 is bent and deformed by the heat. At this time, the bimetal 131 drives the trigger 134 on the heat-conducting connecting rod 132 to move in the direction of the micro switch 133, so that the micro switch 133 is pushed by the trigger 134, so that the normally open state of the micro switch 133 is converted to the normally closed state, and then an overload alarm signal is sent to the alarm, and the alarm sounds an alarm. When the current returns to normal, the bimetal 131 drives the trigger 134 to restore the initial state, and the micro switch 133 is converted from the normally closed state to the normally open state.

[0028] As a specific implementation, the trigger member 134 is a trigger screw, which is detachably mounted on the other end of the heat-conducting connecting rod 132, so that different screw models can be easily replaced according to different overload requirements.

[0029] Specifically, the heat-conducting connecting rod 132 is composed of a vertical rod 1321 located at both ends and a horizontal rod 1323 located in the middle, and the two vertical rods 1321 are arranged in parallel and perpendicular to the horizontal rod 1323. One of the two vertical rods 1321 is fixed to the bimetallic strip 131 and is arranged in close contact with the bimetallic strip 131, so that not only the heat conductivity is better, but also the heat-conducting connecting rod 132 can be pushed in time when the bimetallic strip 131 is deformed by heat. The trigger screw is detachably installed on the other of the two vertical rods 1321 and its installation direction is perpendicular to the vertical rod 1321, so that the timeliness of the trigger screw driven by the heat-conducting connecting rod 132 when being pushed can be ensured, the real-time nature of the alarm is improved, the delay is reduced, and the safety performance is higher. In addition, the vertical rod 1321 connected to the bimetallic strip 131 is formed with a wrapping portion 1322 for wrapping the side of the bimetallic strip 131, so that not only the heat transfer efficiency can be improved, but also the structural stability between the bimetallic strip 131 and the heat-conducting connecting rod 132 can be improved. One of the two vertical rods 1321 is fixedly connected to the bimetallic strip 131 via a metal screw 135 , which can further improve the thermal conductivity.

[0030] Furthermore, the trigger screw can be adjustably installed in the adjustment hole formed by the other one of the two vertical rods 1321 through the adjustment nut, so that the distance between the screw and the micro switch 133 can be conveniently adjusted to achieve adjustable stroke, and adaptive adjustment can be made according to different allowed overload amounts.

[0031] As a specific implementation, the cover 12 is equipped with a plurality of alarm components 13, and the base 11 is provided with a plurality of thermal elements 15, and the plurality of alarm components 13 and the plurality of thermal elements 15 are arranged in a one-to-one correspondence. Usually, a three-phase phase is installed in the circuit breaker, that is, three thermal elements 15 are provided, and micro switches 133 are installed in all three phases, and the three micro switches 133 correspond to the three thermal elements 15 in a one-to-one manner. In this way, even if an individual micro switch 133 is abnormal, the overload alarm non-tripping structure can also work normally, that is, an alarm will be generated only if a current abnormality occurs in one phase, thereby ensuring the reliability of the function.

[0032] As a specific embodiment, the cover 12 is formed with a receiving groove 122 for receiving the wire connecting the micro switch 133 and the alarm. Fixing holes 123 are formed on both sides of the receiving groove 122 for the binding to pass through so as to confine the wire in the receiving groove 122. A through hole 141 is formed on the middle cover 14 for the wire to pass through to electrically connect the alarm. This solution can adopt a universal cover 12, that is, the micro switch 133 can be directly assembled in the groove reserved in the circuit breaker base 11, which is convenient to assemble and does not change the original design of the circuit breaker, which not only reduces the mold investment, but also improves the assembly efficiency. The receiving groove 122 and the fixing hole 123 are designed on the cover 12 to fix the wire of the micro switch 133. The wire does not contact the thermal element and other elements of the circuit breaker, thereby improving the safety performance.

[0033] As a specific implementation, a plurality of support bosses 124 are formed in the mounting groove 121, and a threaded hole 125 is formed in the support boss 124. The micro switch 133 is fixed to the mounting groove 121 by screwing the screws into the threaded hole 125 and the hole formed by the micro switch 133 in sequence. The micro switch 133 is fixed to the mounting groove 121 of the cover 12 by screws, and the support boss 124 is raised so that the micro switch 133 does not contact the bottom of the cover 12, leaving space for the wire to pass through.

[0034] Therefore, the above-mentioned overload alarm non-tripping structure 10 applied to the circuit breaker directly installs the micro switch 133 in the installation groove 121 formed by the cover 12, and the micro switch 133 is electrically connected to the alarm, and then through the cooperation of the bimetallic strip 131, the heat-conducting connecting rod 132 and the thermal element 15, an alarm is promptly issued in case of overload without power outage, while ensuring the safety of electricity use, the continuity of power supply is improved, the overall structure is modularly designed, the original design of the circuit breaker is not changed, the structure is simple, the installation is convenient, and the production cost is low.

[0035] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An overload alarm non-tripping structure applied to a circuit breaker, comprising: A base, a middle cover and a cover; the cover is installed above the middle cover; the middle cover is installed above the base; it is characterized in that the cover is equipped with an alarm component for alarming without tripping when overloaded; the alarm component includes: a bimetallic strip, a heat-conducting connecting rod, a micro switch, an alarm and a triggering member for triggering the micro switch; the cover is formed with a mounting groove; the micro switch is installed in the mounting groove; one end of the bimetallic strip is fixed to the cover; one end of the heat-conducting connecting rod is fixedly connected to the other end of the bimetallic strip and the other end thereof is connected to a thermal element installed in the base; the triggering member is installed on the heat-conducting connecting rod, and under the drive of the bimetallic strip, it moves between a triggering position of resisting the micro switch to trigger the micro switch and a disconnecting position of disengaging from the micro switch to close the micro switch; the alarm is installed in the base and is electrically connected to the micro switch through a wire.

2. The overload alarm non-tripping structure applied to a circuit breaker according to claim 1, characterized in that: The triggering member is a triggering screw; the triggering screw is detachably mounted on the other end of the heat-conducting connecting rod.

3. The overload alarm non-tripping structure applied to a circuit breaker according to claim 2, characterized in that: The heat-conducting connecting rod is composed of vertical rods located at both ends and a cross rod located in the middle; the two vertical rods are arranged in parallel and perpendicular to the cross rod; one of the two vertical rods is fixed to the bimetallic strip and is arranged in contact with the bimetallic strip; the trigger screw is detachably installed on the other of the two vertical rods and its installation direction is perpendicular to the vertical rod.

4. The overload alarm non-tripping structure applied to a circuit breaker according to claim 3, characterized in that: The trigger screw is adjustably installed in an adjustment hole formed in the other one of the two vertical rods through an adjustment nut.

5. The overload alarm non-tripping structure applied to a circuit breaker according to claim 4, characterized in that: The vertical rod connected to the bimetallic strip is formed with a wrapping portion for wrapping the side edge of the bimetallic strip.

6. The overload alarm non-tripping structure applied to a circuit breaker according to claim 5, characterized in that: One of the two vertical rods is fixedly connected to the bimetallic strip via a metal screw.

7. The overload alarm non-tripping structure applied to a circuit breaker according to claim 1, characterized in that: The cover is equipped with a plurality of the alarm components; the base is provided with a plurality of the thermal elements; the plurality of the alarm components and the plurality of the thermal elements are arranged in a one-to-one correspondence.

8. The overload alarm non-tripping structure applied to a circuit breaker according to claim 1, characterized in that: The cover is formed with a receiving groove for receiving the wire connecting the micro switch and the alarm; the middle cover is provided with a through hole for the wire to pass through to connect the alarm.

9. The overload alarm non-tripping structure applied to a circuit breaker according to claim 8, characterized in that: Fixing holes for allowing a binding belt to pass through to confine the wire in the containing groove are respectively formed on both sides of the containing groove.

10. The overload alarm non-tripping structure applied to a circuit breaker according to claim 1, characterized in that: A plurality of supporting bosses are formed in the installation groove; a threaded hole is formed in the supporting boss; the micro switch is fixed to the installation groove by screwing screws into the threaded hole and the hole formed by the micro switch in sequence.

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