Residual-current circuit breaker with N-pole overload mechanism

Abstract

The utility model belongs to the field of residual-current circuit breakers, and particularly relates to a residual-current circuit breaker with an N-pole overload mechanism, which comprises a residual-current circuit breaker body, the bottom of the residual-current circuit breaker body is provided with an assembling groove used for being assembled on a guide rail, and the residual-current circuit breaker body is provided with an N-pole wiring port. An N-pole arc striking sheet is arranged at the position, close to the N-pole wiring port, in the residual-current circuit breaker body, the N-pole arc striking sheet is provided with a bimetallic strip, an auxiliary mounting mechanism is arranged on the assembling groove, and the auxiliary mounting mechanism comprises a rectangular groove formed in the surface of the assembling groove; through the design of the N-pole bimetallic strip, overload protection of an N-pole circuit is realized, overload current can be cut off in time, damage to the N pole and related connecting parts caused by long-term overload operation is avoided, the abrasion and aging speed of the parts is reduced, the overall service life of the circuit breaker is remarkably prolonged, and the maintenance and replacement cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of leakage circuit breakers, and specifically to a leakage circuit breaker with an overload mechanism on the N pole. Background Art

[0002] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can also close, carry, and interrupt the current under abnormal circuit conditions within a specified time. With the popularization of electricity, in order to ensure electrical safety, a household leakage circuit breaker is generally installed in a home. A household leakage circuit breaker is a device for protecting the circuit safety. When abnormal conditions such as overload and short circuit occur in the circuit, it can automatically cut off the circuit to avoid damage to electrical appliances caused by excessive current in the circuit, and at the same time, it can also protect personal safety. In a household circuit, the circuit breaker is usually installed behind the electricity meter to control the current in the circuit.

[0003] In the design of the prior art, although the L pole (live wire) is generally equipped with an overload protection mechanism, such as a bimetallic strip, etc., these mechanisms can bend through the thermal effect when the current exceeds the rated value, thereby triggering the circuit breaker to trip and achieving the purpose of overload protection. However, the N pole (neutral wire) is usually designed to directly connect the wire to the moving contact and does not have an independent overload protection ability. Due to the lack of overload protection on the N pole, when the N pole line is overloaded due to a fault or improper use, the circuit breaker cannot respond in time, which will accelerate the wear and aging of these components, shorten the service life of the entire circuit breaker, and increase the maintenance and replacement costs. Therefore, in view of the above situation, a leakage circuit breaker with an overload mechanism on the N pole is proposed. Summary of the Utility Model

[0004] In order to make up for the problem in the prior art that due to the lack of overload protection on the N pole, when the N pole line is overloaded due to a fault or improper use, the circuit breaker cannot respond in time, which will accelerate the wear and aging of these components, the utility model proposes a leakage circuit breaker with an overload mechanism on the N pole.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a leakage circuit breaker with an overload mechanism on the N pole, including a leakage circuit breaker body, and an assembly groove for assembling on a guide rail is opened at the bottom of the leakage circuit breaker body.

[0006] An N pole wiring port is provided on the leakage circuit breaker body, an N pole arc guide piece is arranged inside the leakage circuit breaker body near the N pole wiring port, and a bimetallic strip is arranged on the N pole arc guide piece.

[0007] An auxiliary installation mechanism is provided on the assembly groove. The auxiliary installation mechanism includes a rectangular groove opened on the surface of the assembly groove. An elastic component is fixedly connected to the inner wall of the rectangular groove. One end of the elastic component is fixedly connected to a contact plate, and the contact plate is located outside the rectangular groove.

[0008] Preferably, the number of the elastic components is four. The elastic component includes an installation cylinder arranged on the inner wall of the rectangular groove. An elastic member is fixedly connected inside the installation cylinder. One end of the elastic member is fixedly connected to a connecting rod, and the end of the connecting rod away from the elastic member is fixed on the contact plate.

[0009] Preferably, an inner cavity is opened on the installation cylinder. The elastic member is fixed inside the inner cavity, and the connecting rod is in clearance fit with the inner cavity.

[0010] Preferably, four screw holes are opened on the inner wall of the rectangular groove. The end of the installation cylinder away from the contact plate is in threaded fit with the screw holes.

[0011] Preferably, a thread structure matching the screw holes is opened on the outer wall of the installation cylinder.

[0012] Preferably, the shape of the contact plate is T-shaped, and an anti-slip pattern is provided on one side surface of the contact plate.

[0013] Preferably, a tripping mechanism is provided inside the leakage circuit breaker body, and a lever for triggering the tripping mechanism is connected to the tripping mechanism.

[0014] Preferably, the end of the bimetallic strip away from the N-pole arc striking piece contacts the lever.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. Through the design of the bimetallic strip of the N-pole in the present utility model, the overload protection of the N-pole circuit is realized. The overload current can be cut off in time, avoiding the damage to the N-pole and related connection components caused by long-term overloading operation, reducing the wear and aging speed of the components, significantly prolonging the overall service life of the circuit breaker, reducing the maintenance and replacement costs, and at the same time further enhancing the protection ability of the electrical system, effectively preventing electrical failures and safety accidents caused by overload.

[0017] 2. Through the structural design of the rectangular groove, mounting cylinder, elastic member and abutting plate, when the leakage circuit breaker body is installed on the guide rail of the electrical cabinet, the user only needs to gently press the abutting plate at the bottom of the leakage circuit breaker body against the guide rail. After installing the other end of the assembly groove on the guide rail, release the leakage circuit breaker body. Under the reset of the elastic member, the abutting plate tightly abuts against the guide rail, enabling a stable connection to be achieved without precise alignment during the installation process, improving the installation efficiency. At the same time, the requirement for the machining accuracy of the assembly groove at the bottom of the leakage circuit breaker body is reduced. Even if there are certain processing errors or slight deviations during installation, the auxiliary installation mechanism can compensate through its elastic deformation ability to ensure that the leakage circuit breaker body can be stably installed on the guide rail. This helps to reduce production costs, can be applicable to guide rails of different specifications and sizes, and improves the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic structural diagram of the leakage circuit breaker;

[0020] Figure 2 is a schematic internal structural diagram of the leakage circuit breaker;

[0021] Figure 3 is a schematic installation structure diagram of the bimetallic strip;

[0022] Figure 4 is a schematic structural diagram of the auxiliary installation mechanism;

[0023] Figure 5 is Figure 4 a partial enlarged structural diagram at position A in

[0024] In the figure: 1. Leakage circuit breaker body; 101. Tripping mechanism; 102. Lever; 103. N-pole connection port; 104. Assembly groove; 2. N-pole arc starter; 3. Bimetallic strip; 4. Auxiliary installation mechanism; 401. Rectangular groove; 402. Mounting cylinder; 4020. Inner cavity; 403. Elastic member; 404. Connecting rod; 405. Abutting plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0026] The following will further elaborate on this application Figures 1-5 for a more detailed description.

[0027] An embodiment of this application discloses a leakage circuit breaker with an N - pole overload mechanism. Referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , a leakage circuit breaker with an N - pole overload mechanism includes a leakage circuit breaker body 1, and an assembly groove 104 for assembling on a guide rail is opened at the bottom of the leakage circuit breaker body 1.

[0028] An N - pole wiring port 103 is provided on the leakage circuit breaker body 1, and an N - pole arc - guiding piece 2 is arranged inside the leakage circuit breaker body 1 near the N - pole wiring port 103, and a bimetallic strip 3 is arranged on the N - pole arc - guiding piece 2.

[0029] An auxiliary installation mechanism 4 is arranged on the assembly groove 104. The auxiliary installation mechanism 4 includes a rectangular groove 401 opened on the surface of the assembly groove 104. An elastic component is fixedly connected to the inner wall of the rectangular groove 401, and one end of the elastic component is fixedly connected to a contact plate 405, and the contact plate 405 is located outside the rectangular groove 401.

[0030] Referring to Figure 4 and Figure 5 , the number of the elastic components is four. The elastic component includes an installation cylinder 402 arranged on the inner wall of the rectangular groove 401. An elastic member 403 is fixedly connected inside the installation cylinder 402, and one end of the elastic member 403 is fixedly connected to a connecting rod 404, and the end of the connecting rod 404 far from the elastic member 403 is fixed on the contact plate 405.

[0031] By setting the elastic component, when installing the leakage circuit breaker body 1 on the guide rail, the size of the assembly groove 104 can be changed by pressing the contact plate 405, achieving the advantage of facilitating installation.

[0032] Referring to Figure 5 , an inner cavity 4020 is opened on the installation cylinder 402, the elastic member 403 is fixed inside the inner cavity 4020, and the connecting rod 404 is in clearance fit with the inner cavity 4020.

[0033] An inner cavity 4020 is provided in the installation cylinder 402 for installing the elastic member 403 and the connecting rod 404 .

[0034] Furthermore, the elastic member 403 is an insulating spring, and the connecting rod 404 is a cylindrical rod structure.

[0035] Reference Figure 4 and Figure 5 The inner wall of the rectangular groove 401 is provided with four screw holes, one end of the mounting tube 402 away from the abutment plate 405 is threadedly matched with the screw holes, and the outer wall of the mounting tube 402 is provided with a threaded structure matched with the screw holes.

[0036] By providing a screw hole in the rectangular groove 401 and a threaded structure on the abutment plate 405 , installation and removal of the installation cylinder 402 can be easily achieved.

[0037] Reference Figure 4 and Figure 5 The shape of the contact plate 405 is T-shaped, and one side of the contact plate 405 is provided with anti-slip grooves.

[0038] By providing anti-slip grooves on the abutment plate 405 , the friction between the abutment plate 405 and the contact surface of the guide rail can be increased, making the installation more stable.

[0039] Reference Figure 1 , Figure 2 and Figure 3 The residual current circuit breaker body 1 has a tripping mechanism 101 inside, and the tripping mechanism 101 is connected to a lever 102 for triggering the tripping mechanism 101 .

[0040] Furthermore, the cooperation between the tripping mechanism 101 and the lever 102 is prior art, and the component structure of the tripping mechanism 101 is prior art, which will not be described in detail here.

[0041] Reference Figure 2 and Figure 3 The end of the bimetallic strip 3 away from the N-pole arc-starting strip 2 is in contact with the lever 102 .

[0042] Furthermore, the deformation of the bimetallic strip 3 drives the lever 102 to rotate, thereby triggering the tripping mechanism 101 to operate.

[0043] Working principle: After the N pole of the leakage circuit breaker body 1 is connected to the circuit, the bimetallic strip 3 remains in a straight line under normal working conditions. When the current of the N pole exceeds the rated value, the bimetallic strip 3 will be deformed by the heat generated by the current. As the current increases and the time prolongs, the deformation of the bimetallic strip 3 gradually increases, and finally the lever 102 is moved, and the rotation of the lever 102 drives the tripping mechanism 101 to work, cutting off the circuit, thereby protecting electrical equipment and lines from overload damage.

[0044] When installing the leakage circuit breaker body 1, the user gently presses the contact plate 405 at the bottom of the leakage circuit breaker body 1 against the guide rail. At this time, under the action of the pressure, the contact plate 405 squeezes the connecting rod 404, and then squeezes the elastic member 403 through the connecting rod 404. After installing the other end of the assembly groove 104 on the guide rail, release the leakage circuit breaker body 1. Under the reset of the elastic member 403, the contact plate 405 tightly abuts against the guide rail, so that a stable connection can be achieved without precise alignment during the installation process, improving the installation efficiency.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A leakage circuit breaker with an N-pole overload mechanism, comprising a leakage circuit breaker body (1), wherein a mounting groove (104) for mounting on a guide rail is provided at the bottom of the leakage circuit breaker body (1), characterized in that: The residual current circuit breaker body (1) is provided with an N-pole wiring port (103), an N-pole arc-starting piece (2) is provided inside the residual current circuit breaker body (1) near the N-pole wiring port (103), and a bimetallic piece (3) is provided on the N-pole arc-starting piece (2); An auxiliary installation mechanism (4) is provided on the assembly groove (104), the auxiliary installation mechanism (4) comprising a rectangular groove (401) opened on the surface of the assembly groove (104), an elastic component is fixedly connected to the inner wall of the rectangular groove (401), one end of the elastic component is fixedly connected to a contact plate (405), and the contact plate (405) is located outside the rectangular groove (401).

2. A leakage circuit breaker with an N-pole overload mechanism according to claim 1, characterized in that: There are four elastic components, each comprising a mounting tube (402) arranged on the inner wall of the rectangular groove (401), an elastic member (403) being fixedly connected to the interior of the mounting tube (402), one end of the elastic member (403) being fixedly connected to a connecting rod (404), and one end of the connecting rod (404) away from the elastic member (403) being fixed to a contact plate (405).

3. A leakage circuit breaker with an N-pole overload mechanism according to claim 2, characterized in that: An inner cavity (4020) is provided on the installation cylinder (402), the elastic member (403) is fixed inside the inner cavity (4020), and the connecting rod (404) is clearance-matched with the inner cavity (4020).

4. A leakage circuit breaker with an N-pole overload mechanism according to claim 2, characterized in that: Four screw holes are provided on the inner wall of the rectangular groove (401), and one end of the mounting tube (402) away from the abutment plate (405) is threadably engaged with the screw holes.

5. A residual current circuit breaker with an N-pole overload mechanism according to claim 4, characterized in that: The outer wall of the installation cylinder (402) is provided with a threaded structure that matches the screw hole.

6. A residual current circuit breaker with an N-pole overload mechanism according to claim 5, characterized in that: The shape of the abutment plate (405) is T-shaped, and one side surface of the abutment plate (405) is provided with anti-slip grooves.

7. The residual current circuit breaker with N-pole overload mechanism according to claim 1, characterized in that: The residual current circuit breaker body (1) has a tripping mechanism (101) inside, and the tripping mechanism (101) is connected to a lever (102) for triggering the tripping mechanism (101).

8. A residual current circuit breaker with an N-pole overload mechanism according to claim 1 or 7, characterized in that: One end of the bimetallic strip (3) away from the N-pole arc-starting strip (2) is in contact with the lever (102).

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