Circuit breaker release structure

Abstract

A breaker release structure belongs to the technical field of low-voltage electric appliances. Comprising a static contact, one end of the static contact far away from a moving contact of the circuit breaker is provided with a release used for actuating tripping of the circuit breaker, one end of the static contact close to the moving contact of the circuit breaker is provided with an arc striking piece connected with breaking arc of the circuit breaker, one end of the arc striking piece is fixedly connected with the static contact, and the other end of the arc striking piece extends to the lower part of the release. And an insulating part for isolating the release from the arc striking piece is arranged between the release and the arc striking piece. The utility model has the advantages that: the insulating part for isolating the tripper from the arc striking piece is arranged between the tripper and the arc striking piece, so that the tripper can be prevented from being polluted by particles generated by an electric arc in the opening process of the moving contact relative to the static contact and even being blocked in a serious condition, and a good protection effect on the tripper is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a circuit breaker release structure. Background Art

[0002] As is known in the industry, a circuit breaker is mainly composed of a base, an arc extinguishing system, a contact system, an operating mechanism and a release. One of the many functions of the contact system is to control the closing and opening of the circuit, which is what the industry usually calls the function of connecting and disconnecting the circuit; the function of the arc extinguishing system is to extinguish the arc generated when the moving contact is separated from the static contact; the function of the operating mechanism is to perform the closing and opening operations of the circuit breaker; the function of the release is to detect abnormal current, and when abnormal current is detected, it will immediately act to trip the circuit breaker and cut off the circuit.

[0003] CN214099551U discloses a "circuit breaker release", in which the release armature is divided into a snap-fit ​​part and a magnetic actuation part, and the snap-fit ​​part cooperates with the yoke to surround the conductor; the bimetallic strip is divided into a conductor connection part and a thermal actuation part, and the conductor connection part extends along the length direction of the circuit breaker and is fitted and fixed with the conductor, thereby realizing the extension arrangement of the conductor in one direction, that is, the installation of two release systems can be realized by using a straight long (i.e., long straight) conductor, thereby avoiding the defect of multiple-section bending of the conductor in the existing circuit breaker, and the conductor connection part of the bimetallic strip extends into the space between the snap-fit ​​part and the conductor, thereby further saving space in the length direction of the circuit breaker, making the overall structural layout reasonable and compact, which is conducive to the miniaturization of the molded case circuit breaker, while reducing the processing links and reducing the cost.

[0004] However, the above CN214099551U has the following drawbacks: since there are no isolation measures between the release and the arc extinguishing system and the release, particles generated by the arc when the moving contact is moved away from the static contact, i.e. in the process of breaking the fault current, can easily cause contamination of the release, and in severe cases, the release may be stuck and lose its proper tripping function. Utility Model Content

[0005] The task of the utility model is to provide a circuit breaker release structure which helps to avoid the particles generated by the arc during the opening process of the moving contact relative to the static contact from polluting the release and even causing jamming in serious conditions, thereby playing a good protective role for the release.

[0006] The task of the utility model is accomplished in this way. A circuit breaker release structure comprises a static contact, wherein the end of the static contact away from the moving contact of the circuit breaker is provided with a release for actuating the circuit breaker to trip, and the end of the static contact close to the moving contact of the circuit breaker is provided with an arc-starting piece for connecting and leading the circuit breaker to break the arc. One end of the arc-starting piece is fixedly connected to the static contact, and the other end extends to the bottom of the release. An insulating component for isolating the release from the arc-starting piece is provided between the release and the arc-starting piece.

[0007] In the utility model, the static contact comprises a bending portion inclined toward one side of the moving contact of the circuit breaker, and an accommodating cavity in the shape of a letter "⊓" and inclined toward the left is formed inside the bending portion.

[0008] In the utility model, the insulating component is an integrated structure, including a main body and a raised portion arranged on the main body, the end of the raised portion away from the main body is constituted as an accommodating cavity mating end, and the accommodating cavity mating end is mated with the accommodating cavity, the end of the raised portion close to the main body is constituted as an insulating component limiting end, and the insulating component limiting end cooperates with the static contact to limit the insulating component, and the parts of the main body located on both sides of the insulating component limiting end are constituted as insulating component mounting parts.

[0009] In the utility model, the insulating component installation portion is matched with the insulating component installation portion matching groove formed in the upper base installation cavity of the circuit breaker upper base.

[0010] In the utility model, a positioning hole and a fixing hole are provided on the static contact, a positioning hole matching boss is formed in the upper base mounting cavity of the circuit breaker upper base at a position corresponding to the positioning hole, and a through hole is provided at a position corresponding to the fixing hole, the positioning hole matches with the positioning hole matching boss, and the fixing hole is fixed to the upper base mounting cavity by means of the through hole.

[0011] In the utility model, an arc-isolating cover for isolating the static contact is sleeved on the bent portion of the static contact.

[0012] In the utility model, the insulating component comprises a first insulating petal block and a second insulating petal block, and the first insulating petal block and the second insulating petal block are face-to-face spliced ​​to form a split assembly structure of the insulating component.

[0013] The technical effect of the technical solution provided by the utility model is that: since an insulating component for isolating the tripper from the arc-striking component is provided between the tripper and the arc-striking component, it helps to avoid contamination of the tripper by particles generated by the arc during the opening process of the moving contact relative to the static contact, and even prevents jamming of the tripper in severe conditions, thereby playing a good protective role for the tripper. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the circuit breaker of the utility model;

[0015] Figure 2 for Figure 1 A three-dimensional exploded structural diagram of the trip device shown;

[0016] Figure 3 for Figure 1 and Figure 2 The schematic diagram of the assembled static contact, release and arc-starting piece shown;

[0017] Figure 4 for Figure 1 The schematic diagram of the bottom view of the upper base of the circuit breaker shown;

[0018] Figure 5 for Figure 1 and Figure 2 A structural diagram of a first embodiment of an insulating component shown;

[0019] Figure 6 for Figure 1 and Figure 2 The structural diagram of the second embodiment of the insulating component is shown. DETAILED DESCRIPTION

[0020] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0021] In the following description, any concepts of directionality (or orientation) such as up, down, left, right, front and back that may be involved are all with reference to the position state of the figure being described, with the purpose of facilitating public understanding, and therefore cannot be understood as a special limitation on the technical solution provided by the present utility model.

[0022] See also Figure 1 ,exist Figure 1 The circuit breaker shown in the figure is a molded case circuit breaker, which also shows the upper base 6a and the lower base 6f of the circuit breaker that cooperate with each other. According to professional common sense, the housing of the circuit breaker is formed by the cooperation of the upper and lower bases 6a and 6f of the circuit breaker. Also shown are the operating mechanism 7, the circuit breaker moving contact 8, the arc extinguishing chamber 9 and two wiring terminals, namely the first wiring terminal 10a and the second wiring terminal 10b. If the first wiring terminal 10a can be used by the user to connect the power supply to the outside, the second wiring terminal 10b is connected to the load to the outside; of course, if the second wiring terminal 10b is used by the user to connect the power supply to the outside, the first wiring terminal 10a is connected to the load to the outside, and the arrangement direction of the two wiring terminals is arranged along the length direction of the circuit breaker.

[0023] Please refer to 1 to Figure 5 , showing a circuit breaker moving contact 8, a stationary contact 1, a tripper 2 and an arc-striking member 3. The stationary contact 1 is provided with a tripper 2 for actuating the circuit breaker to trip at one end away from (i.e., away from) the circuit breaker moving contact 8. The stationary contact 1 is provided with the aforementioned arc-striking member 3 for guiding the circuit breaker to break the arc at one end close to (i.e., toward) the circuit breaker moving contact 8. One end of the arc-striking member 3 is fixedly connected to the stationary contact 1, and the other end extends to below the tripper 2.

[0024] As the technical key point of the technical solution provided by the utility model: an insulating component 4 for isolating the tripper 2 from the arc-starting member 3 is provided between the tripper 2 and the arc-starting member 3. This technical measure faithfully realizes the technical effect mentioned by the applicant in the technical effect column above.

[0025] In this embodiment, the static contact 1 extends linearly in the arrangement direction of the two terminals, namely, the circuit breaker load terminal, i.e., the second terminal 10b, and the circuit breaker power terminal, i.e., the first terminal 10a, which are in the length direction of the circuit breaker.

[0026] The static contact 1 faces one end of the circuit breaker power terminal, that is, one end of the first terminal 10a ( Figures 1 to 3 The left end of the position state shown in the figure is formed with a bent portion 11, on which a static contact 16 is arranged, and the static contact 16 is in contact with and separated from the circuit breaker moving contact 8 to realize the connection and disconnection of the circuit breaker, and the static contact 1 is directed toward one end of the circuit breaker load terminal, that is, one end of the second terminal 10b ( Figures 1 to 3 A connecting portion 13 is extended from the right end (in the position shown in FIG. 1 ), and the release 2 is arranged on the connecting portion 13.

[0027] Depend on Figure 2 and Figure 3 As shown, the aforementioned bending portion 11 includes a first bending section 111 and a second bending section 112 interconnected therewith, the aforementioned static contact 16 is fixed on the second bending section 112, one end of the aforementioned arc-starting member 3 is fixed below the static contact 16, and the other end is bent and extends below the release 2. The bending portion 11 has an accommodating cavity 12 formed inside, and the shape of the accommodating cavity 12 is in the shape of a left-leaning ⊓ (also referred to as a "roughly Π-shaped accommodating cavity") and is located between the aforementioned first bending section 111 and the second bending section 112.

[0028] See the key points Figure 5 And combined with Figure 2The insulating component 4 is an integrated structure, including a main body 41 and a protruding portion 42 arranged on the main body 41, the end of the protruding portion 42 away from the main body 41 is configured as an accommodating cavity fitting end 421, and the accommodating cavity fitting end 421 is fitted with the accommodating cavity 12, and the end of the protruding portion 42 close to (i.e. facing) the main body 41 is configured as an insulating component limiting end 422, and the insulating component limiting end 422 cooperates with the static contact 1 to limit the insulating component 4, and the parts of the main body 41 located on both sides of the insulating component limiting end 422 are configured as insulating component mounting portions 411.

[0029] See Figure 2 , Figure 4 and Figure 5 The aforementioned insulating component mounting portion 411 is matched with the insulating component mounting portion matching groove 6c formed in the upper base mounting cavity 6b of the circuit breaker upper base 6a (mentioned above). The positive significance of embedding or inserting the accommodating cavity fitting end 421 (also called "accommodating cavity plug-in end") into the accommodating cavity 12 is that it can prevent the static contact 1 from being deformed when the circuit breaker is closed or opened.

[0030] Depend on Figure 3 As shown, a positioning hole 14 and a fixing hole 15 are provided on the static contact 1. Figure 4 As shown, a positioning hole matching boss 6d is formed in the upper base mounting cavity 6b of the upper base 6a of the aforementioned circuit breaker and at a position corresponding to the positioning hole 14, and a through hole 6e is opened at a position corresponding to the fixing hole 15. The positioning hole 14 matches with the positioning hole matching boss 6d, and the fixing hole 15 is fixed to the upper base mounting cavity 6b by means of the through hole 6e.

[0031] Depend on Figure 1 and Figure 2 As shown, an arc-isolating cover 5 for isolating the static contact 1 is sleeved on the bent portion 11 of the static contact 1 .

[0032] When the circuit breaker is disconnected, the insulating component 4 prevents the high-temperature gas and high-temperature particles generated by the disconnection of the moving and static contacts (i.e., the moving contact relative to the static contact) from transferring toward the release 2, thereby avoiding contamination of the release 2, which is very beneficial to improving the insulation capacity of the circuit breaker.

[0033] Since the structure system of the aforementioned release device also includes an arc shield 5, the arc shield 5 is sleeved on the bent portion 11 of the static contact 1 to isolate the static contact 1. When the circuit breaker is disconnected, the arc shield 5 prevents the high-temperature particles generated by the disconnection from contaminating the static contact 1.

[0034] As known in the industry, the release in this embodiment is a snap-fit ​​release, including a yoke, a bracket, an armature, a thermal element, etc. The insulating component 4 described in this embodiment is an integrated structure. As known in the industry, if the release 2 is a screw-type release, the insulating component 4 described in the utility model can also be a split structure.

[0035] In this embodiment, although Figure 4 The present invention is determined to be directed to a three-pole circuit breaker by the illustration, but this is only a specific implementation example, and thus the present invention cannot be limited by the number of poles of the circuit breaker, such as four poles or two poles.

[0036] See also Figure 6 , as a second embodiment of the insulating member 4, that is, relative to Figure 5 In another embodiment of the integrated structure shown, the aforementioned insulating component 4 includes a first insulating petal block 43 and a second insulating petal block 44, and the first insulating petal block 43 and the second insulating petal block 44 are spliced ​​face to face to form a split assembly structure of the insulating component 4.

[0037] In summary, the technical solution provided by the utility model makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A circuit breaker release structure, comprising a stationary contact (1), wherein one end of the stationary contact (1) away from the moving contact (8) of the circuit breaker is provided with a release (2) for actuating the circuit breaker to release, and one end of the stationary contact (1) close to the moving contact (8) of the circuit breaker is provided with an arc-starting member (3) for connecting and guiding the circuit breaker to break the arc, wherein one end of the arc-starting member (3) is fixedly connected to the stationary contact (1), and the other end extends to the bottom of the release (2), characterized in that: An insulating component (4) for isolating the tripper (2) from the arc-starting component (3) is provided between the tripper (2) and the arc-starting component (3).

2. A circuit breaker release structure according to claim 1, characterized in that: The static contact (1) comprises a bent portion (11) inclined towards one side of the circuit breaker moving contact (8), and a receiving cavity (12) in the shape of a letter "⊓" and inclined towards the left is formed inside the bent portion (11).

3. A circuit breaker release structure according to claim 1, characterized in that: The insulating component (4) is an integrated structure, comprising a main body (41) and a protruding portion (42) arranged on the main body (41); the end of the protruding portion (42) away from the main body (41) is constituted as a housing cavity insertion end (421), and the housing cavity insertion end (421) is inserted with the housing cavity (12); the end of the protruding portion (42) close to the main body (41) is constituted as an insulating component limiting end (422), and the insulating component limiting end (422) cooperates with the static contact (1) to limit the insulating component (4); the parts of the main body (41) located on both sides of the insulating component limiting end (422) are constituted as insulating component mounting parts (411).

4. A circuit breaker release structure according to claim 3, characterized in that: The insulating component mounting portion (411) matches with an insulating component mounting portion matching groove (6c) formed in an upper base mounting cavity (6b) of an upper base (6a) of a circuit breaker.

5. A circuit breaker release structure according to claim 4, characterized in that: A positioning hole (14) and a fixing hole (15) are provided on the static contact (1); a positioning hole matching boss (6d) is provided in the upper base mounting cavity (6b) of the circuit breaker upper base (6a) at a position corresponding to the positioning hole (14); and a through hole (6e) is provided at a position corresponding to the fixing hole (15); the positioning hole (14) matches the positioning hole matching boss (6d), and the fixing hole (15) is fixed to the upper base mounting cavity (6b) by means of the through hole (6e).

6. A circuit breaker release structure according to claim 2, characterized in that: An arc isolation cover (5) for isolating the static contact (1) is sleeved on the bent portion (11) of the static contact (1).

7. A circuit breaker release structure according to claim 3, characterized in that: The insulating component (4) comprises a first insulating petal block (43) and a second insulating petal block (44), and the first insulating petal block (43) and the second insulating petal block (44) are spliced ​​face to face to form a split assembly structure of the insulating component (4).

Images