Molded case circuit breaker with tripping adjustable structure

Abstract

The utility model relates to a molded case circuit breaker with a tripping adjustable structure. The problem that tripping cannot be adjusted after an existing circuit breaker leaves a factory is solved. The traction device comprises a base and a traction rod, the first tripping mechanism is arranged on the base and is matched with the traction rod to realize tripping; the second tripping mechanism is arranged on the base and is matched with the traction rod to realize tripping; the bracket is arranged on the base; and the adjusting structure is arranged on the bracket and is used for driving the first tripping mechanism and / or the second tripping mechanism to move so as to realize tripping adjustment. The beneficial effects of the utility model are that the circuit breaker is provided with the adjusting structure which is matched with the first tripping mechanism and the second tripping mechanism, so that the tripping of the circuit breaker can be adjusted. The utility model also has the advantages of simple structure, convenience in assembly, reliable action, long service life and the like.

Description

Technical Field

[0001] The utility model relates to a plastic case circuit breaker, in particular to a plastic case circuit breaker with a trip adjustable structure. Background Art

[0002] A plastic case circuit breaker mainly consists of a contact arc extinguishing system, an operating mechanism and a release. The function of the release is to monitor the current and voltage operation data of the main circuit, and set a certain threshold value according to national standards to form a tripping performance with a specific protection curve. When an overload or short circuit fault occurs in the circuit, the release realizes the protection of the plastic case circuit breaker against overload or short circuit faults through thermal effect or magnetic effect.

[0003] Traditional thermal magnetic releases mainly achieve overload protection and short circuit protection through the cooperation of a bimetal and an armature. When the circuit is overloaded, the bimetal is deformed by heat, and then drives the operating mechanism to act and disconnect the circuit; when the circuit is short circuited, the electromagnet of the thermal magnetic release generates magnetic force to adsorb the armature, so that the armature releases the main contact through the transmission mechanism after being adsorbed, playing the effect of power-off protection. However, in the actual production and use process, according to different required scenarios, sometimes it is necessary to delay tripping so that the circuit breaker separates, while the tripping time of the existing plastic case circuit breaker is usually specific and cannot be actually adjusted for tripping. Sometimes it is necessary to adjust the tripping operating current to achieve functions such as grading protection, while the tripping operating current of the existing plastic case circuit breaker is usually specific (set) and cannot be adjusted according to actual needs for tripping. Summary of the Utility Model

[0004] To solve the problem that the tripping of the existing circuit breaker is not adjustable after leaving the factory in the background art, the utility model provides a plastic case circuit breaker with a trip adjustable structure.

[0005] The technical solution of the utility model is: a plastic case circuit breaker with a trip adjustable structure, including a base and a traction rod, further including:

[0006] A first tripping mechanism, arranged on the base, and cooperating with the traction rod to realize tripping;

[0007] A second tripping mechanism, arranged on the base, and cooperating with the traction rod to realize tripping;

[0008] A bracket, arranged on the base;

[0009] An adjusting structure, arranged on the bracket, and used to drive the first tripping mechanism and / or the second tripping mechanism to move to realize tripping adjustment.

[0010] As a further improvement of the present utility model, the first tripping mechanism includes a bimetallic strip, and a first tripping member for pushing the traction rod to rotate and trip is provided on the bimetallic strip. The adjusting structure includes a first adjusting member and a first transmission rod. The first adjusting member is connected to the first tripping member through the first transmission rod and is used to adjust the swing distance between the first tripping member and the traction rod.

[0011] As a further improvement of the present utility model, it further includes a first connecting elastic member. A first connecting portion is provided on the first transmission rod. The first connecting portion is connected to the bimetallic strip through the first connecting elastic member and is used to adjust the swing distance between the first tripping member and the traction rod.

[0012] As a further improvement of the present utility model, a first transmission portion and a first mounting portion are provided on the first transmission rod. The first mounting portion is arranged on the bracket and is rotatably arranged relative to the bracket. A first driving portion is provided on the first adjusting member, and a spiral structure for driving the first transmission portion to rotate is included on the first driving portion.

[0013] As a further improvement of the present utility model, it further includes a first limiting elastic member. A first notch is provided on the bracket. The first adjusting member is snapped into the first notch. The first adjusting member forms a circumferential rotation limiting fit through a first limiting block and a first stop block. The first limiting elastic member abuts against the bracket and the first adjusting member respectively to limit the axial position of the first driving portion.

[0014] As a further improvement of the present utility model, the second tripping mechanism includes an armature, and a tripping portion for pushing the traction rod to rotate and trip is provided on the armature. The adjusting structure includes a second adjusting member and a second transmission rod. The second adjusting member is connected to the tripping portion through the second transmission rod and is used to adjust the swing distance between the tripping portion and the traction rod.

[0015] As a further improvement of the present utility model, it further includes a second connecting elastic member. A second connecting portion is provided on the second transmission rod. The second connecting portion is connected to the armature through the second connecting elastic member and is used to adjust the swing distance between the tripping portion and the traction rod. The armature is swingably arranged, and a gear position groove is provided on the armature. One end of the second connecting elastic member is arranged in the gear position groove.

[0016] As a further improvement of the present utility model, the second adjusting member includes a second driving portion, and a spiral structure for driving the second transmission rod to rotate is included on the second driving portion.

[0017] As a further improvement of the present utility model, it further includes a mounting plate. The bracket is provided with a guiding groove and a mounting notch for easy installation. The mounting plate is inserted into the mounting notch and is slidably engaged with the bracket through the guiding groove.

[0018] As a further improvement of the present utility model, it further includes a static contact piece. The static contact piece includes a conductive part that cooperates with the moving contact piece for conducting electricity. The conductive part is bent and obliquely arranged. The static contact piece is detachably connected to the base. The base is provided with a support block. The support block is arranged below the conductive part to support the conductive part or the support block is arranged below the conductive part and cooperates with the conductive part through a magnetic enhancement block.

[0019] The beneficial effects of the present utility model are that an adjustment structure is provided, and through cooperation with the first tripping mechanism and the second tripping mechanism, the tripping of the circuit breaker is adjustable. The present utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 is a schematic structural view of an embodiment of the present utility model.

[0021] Attached Figure 2 is an exploded structural view of an embodiment of the present utility model.

[0022] Attached Figure 3 is a schematic structural view of the first tripping mechanism and the second tripping mechanism of an embodiment of the present utility model.

[0023] Attached Figure 4 is Figure 3 the exploded structural view of the attached

[0024] Attached Figure 5 is a schematic structural view of the first adjusting member of an embodiment of the present utility model.

[0025] Attached Figure 6 is a schematic structural view of the bracket of an embodiment of the present utility model.

[0026] Attached Figure 7 is a schematic structural view of the first transmission rod of an embodiment of the present utility model.

[0027] Attached Figure 8 is a schematic cross-sectional structural view at the static contact piece of an embodiment of the present utility model.

[0028] In the figure, 1 is the base; 11 is the support block; 12 is the support groove; 2 is the traction rod; 3 is the first tripping mechanism; 31 is the bimetallic strip; 32 is the first tripping part; 4 is the second tripping mechanism; 41 is the armature; 411 is the gear slot; 42 is the tripping portion; 5 is the bracket; 51 is the first notch; 52 is the first stop block; 53 is the mounting plate; 54 is the guide groove; 55 is the mounting notch; 61 is the first adjusting member; 611 is the first driving portion; 612 is the first limiting block; 62 is the first transmission rod; 621 is the first connecting portion; 622 is the first transmission portion; 623 is the first mounting portion; 63 is the first connecting elastic member; 64 is the first limiting elastic member; 71 is the second adjusting member; 711 is the second driving portion; 72 is the second transmission rod; 721 is the second connecting portion; 73 is the second connecting elastic member; 8 is the static contact piece; 81 is the conductive portion; 82 is the magnetic enhancing block. Detailed implementation mode

[0029] The following further describes the embodiments of the present invention in conjunction with the accompanying drawings:

[0030] As Figure 1 Combined with Figures 2 - 8 shown, a molded case circuit breaker with a tripping adjustable structure includes a base 1 and a traction rod 2, and further includes:

[0031] A first tripping mechanism 3 is arranged on the base 1 and cooperates with the traction rod 2 to achieve tripping;

[0032] A second tripping mechanism 4 is arranged on the base 1 and cooperates with the traction rod 2 to achieve tripping;

[0033] A bracket 5 is arranged on the base 1;

[0034] An adjusting structure is arranged on the bracket 5 and is used to drive the first tripping mechanism 3 and / or the second tripping mechanism 4 to move to achieve tripping adjustment. The beneficial effect of the present invention is that an adjusting structure is provided, and through cooperation with the first tripping mechanism and the second tripping mechanism, the tripping of the circuit breaker can be adjusted. The present invention also has the advantages of simple structure, convenient assembly, reliable operation, and long service life.

[0035] The described first tripping mechanism 3 includes a bimetallic strip 31. A first tripping member 32 for pushing and pulling the traction rod 2 to rotate and trip is provided on the bimetallic strip 31. The adjusting structure includes a first adjusting member 61 and a first transmission rod 62. The first adjusting member 61 is connected to the first tripping member 32 through the first transmission rod 62 and is used to adjust the swinging distance between the first tripping member 32 and the traction rod 2. By the cooperation of the first adjusting member and the first transmission rod, the swinging distance of the first tripping member can be adjusted in the present utility model, that is, the time required for the bimetallic strip to thermally deform and trip is adjusted, so that the product can adapt to different working environments and customers can adjust according to needs. The structure of the present utility model is simple, without the need to additionally increase components (intermediate transmission components), directly cooperates with the existing traction rod to achieve tripping, and at the same time, the adjusting member has a simple structure and convenient and reliable operation.

[0036] The present utility model further includes a first connecting elastic member 63. A first connecting portion 621 is provided on the first transmission rod 62. The first connecting portion 621 is connected to the bimetallic strip 31 through the first connecting elastic member 63 and is used to adjust the swinging distance between the first tripping member 32 and the traction rod 2. Through the first connecting elastic member, the connection between the first transmission rod and the first tripping member is reliable, and it is not easy to interfere and damage components during the movement of the first adjusting member, so that the product has a long service life, without the need to additionally increase components, and the product has good compatibility. Generally speaking, the first connecting elastic member can be a spring.

[0037] A first transmission portion 622 and a first mounting portion 623 are provided on the first transmission rod 62. The first mounting portion 623 is arranged on the bracket 5 and is rotatably arranged relative to the bracket 5. A first driving portion 611 is provided on the first adjusting member 61. The first driving portion 611 includes a spiral structure for driving the first transmission portion 622 to rotate. The setting of the first driving portion can increase the axial distance through the simple rotation of the first adjusting member, thereby driving the first transmission rod to rotate and realizing the adjustment of the swinging distance of the first tripping member, so that the user or customer can adjust the thermal tripping time according to needs, and the product has a wide adaptation range.

[0038] The present utility model further includes a first limiting elastic member 64. A first notch 51 is provided on the bracket 5. The first adjusting member 61 is clamped into the first notch 51. The first adjusting member 61 forms a circumferential rotation limiting cooperation with the first limiting block 612 and the first stop block 52. The first limiting elastic member 64 abuts against the bracket 5 and the first adjusting member 61 respectively to limit the axial position of the first driving portion 611. The setting of the first limiting block and the second stop block can limit the rotation of the first adjusting member to avoid over-movement. The setting of the first limiting elastic member can provide an elastic force to avoid the change of the position of the adjusting member due to the reverse acting force of the first transmission rod.

[0039] The described second tripping mechanism 4 includes an armature 41, and a tripping portion 42 for pushing the traction rod 2 to rotate and trip is provided on the armature 41. The adjustment structure includes a second adjusting member 71 and a second transmission rod 72. The second adjusting member 71 is connected to the tripping portion 42 through the second transmission rod 72 and is used to adjust the swing distance between the tripping portion 42 and the traction rod 2. Specifically, the structure of the second adjusting member is the same as or similar to that of the first adjusting member, and the structure of the second transmission rod is the same as or similar to that of the first transmission rod. In this way, the adjustment structure of the product can achieve compatibility, reduce the number of mold openings, and lower the production cost. Moreover, it is not necessary to modify the traction rod of the existing product, making the product highly adaptable.

[0040] The present utility model further includes a second connecting elastic member 73. A second connecting portion 721 is provided on the second transmission rod 72. The second connecting portion 721 is connected to the armature 41 through the second connecting elastic member 73 and is used to adjust the swing distance between the tripping portion 42 and the traction rod 2. The armature 41 is swingably arranged, and a gear position groove 411 is provided on the armature 41. One end of the second connecting elastic member 73 is arranged in the gear position groove 411. By adjusting the deformation amount of the second connecting elastic member (spring) on the armature, the pulling force provided by the spring can be changed, and further the magnitude of the operating current of the tripping mechanism can be adjusted, that is, the magnitude of the operating current required during magnetic tripping can be adjusted. The gear position groove can further adjust the magnitude of the operating current required during magnetic tripping. By hanging the second connecting elastic member in different gear position grooves, the magnitude of the operating current required during magnetic tripping can be adjusted through swinging and the lever principle. Usually, the adjustment of the gear position groove is used when a large range of adjustment of the operating current is required, and the second adjusting member is adjusted within a relatively small range. It can be understood that the accuracy is higher when the adjustment range of the operating current is relatively small.

[0041] The second adjusting member 71 includes a second driving portion 711, and a spiral structure for driving the second transmission rod 72 to rotate is included on the second driving portion 711. With the setting of the second driving portion, the axial distance can be increased simply by rotating the second adjusting member, thereby driving the second transmission rod to rotate, realizing the adjustment of the swing distance of the tripping portion, so that the user can adjust the magnitude of the operating current according to needs, making the product have a wide adaptability range. In fact, a limiting spring can also be provided on the second adjusting member to maintain the position of the second adjusting member.

[0042] The present utility model further includes a mounting plate 53. A guiding groove 54 and a mounting notch 55 for facilitating installation are provided on the bracket 5. The mounting plate 53 is inserted into the mounting notch 55 and is in sliding fit with the bracket 5 through the guiding groove 54. The setting of the mounting plate facilitates the installation of the first transmission rod and the second transmission rod. The structure is simple, the assembly is convenient, and it can make the adjustment structure form an integral structure, facilitating the overall installation on the base.

[0043] The utility model further includes a static contact piece 8. The static contact piece 8 includes a conductive part 81 that cooperates with the moving contact piece for conducting electricity. The conductive part 81 is bent and obliquely arranged. The static contact piece 8 is detachably connected to the base 1. The base 1 is provided with a support block 11. The support block 11 is arranged below the conductive part 81 to support the conductive part 81, or the support block 11 is arranged below the conductive part 81 and cooperates with the conductive part 81 through a magnetic enhancement block 82. The setting of the first driving part can simply rotate the first adjusting part to increase the axial distance, thereby driving the first transmission rod to rotate, realizing the adjustment of the swinging distance of the first detaching part, so that the user can adjust the thermal tripping time according to needs, making the product have a wide adaptation range. Specifically, two different static contact pieces are disclosed in the utility model. Refer to the attached Figure 2 , among which the static contact piece arranged in the middle accommodating cavity can be directly placed on the support block, and the support block supports the conductive part. The bottom of the static contact piece arranged in the side accommodating cavity can be provided with a magnetic enhancement piece, and the magnetic enhancement piece is inserted into the support groove 12 of the support block. The setting of the support block keeps the height of the static contact head on the conductive part consistent, facilitating reliable contact with the moving contact head to realize circuit conduction. That is, the two static contact pieces can be replaced and substituted, so that according to different actual working conditions and breaking performance requirements, similar static contact pieces can be selected, reducing the production cost and use cost.

[0044] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It 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 to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "plurality" is two or more.

[0046] Notice to all technical personnel: Although this utility model has been described according to the above specific embodiments, the inventive concept of this utility model is not limited to this utility model only. Any modification that utilizes the inventive concept of this utility model will be included within the scope of protection of the patent right of this utility model.

Claims

1. A molded case circuit breaker with an adjustable tripping structure, comprising a base (1) and a traction rod (2), characterized in that Also included: A first tripping mechanism (3) is disposed on the base (1) and cooperates with the traction rod (2) to achieve tripping; A second tripping mechanism (4) is disposed on the base (1) and cooperates with the traction rod (2) to achieve tripping; A bracket (5) is arranged on the base (1); The adjustment structure is arranged on the bracket (5) and is used to drive the first tripping mechanism (3) and / or the second tripping mechanism (4) to move to achieve tripping adjustment.

2. A molded case circuit breaker with an adjustable tripping structure according to claim 1, characterized in that The first release mechanism (3) comprises a bimetallic strip (31), on which a first release member (32) is provided for pushing the traction rod (2) so that the traction rod (2) is rotated and released, and the adjustment structure comprises a first adjustment member (61) and a first transmission rod (62), and the first adjustment member (61) is connected to the first release member (32) via the first transmission rod (62) and is used to adjust the swing distance between the first release member (32) and the traction rod (2).

3. A molded case circuit breaker with an adjustable tripping structure according to claim 2, characterized in that It also comprises a first connecting elastic member (63), the first transmission rod (62) is provided with a first connecting portion (621), the first connecting portion (621) is connected to the bimetallic strip (31) via the first connecting elastic member (63) and is used to adjust the swing distance between the first release member (32) and the traction rod (2).

4. A molded case circuit breaker with an adjustable tripping structure according to claim 2, characterized in that The first transmission rod (62) is provided with a first transmission part (622) and a first mounting part (623); the first mounting part (623) is arranged on the bracket (5) and is rotatably arranged relative to the bracket (5); the first adjustment member (61) is provided with a first driving part (611); the first driving part (611) includes a spiral structure for driving the first transmission part (622) to rotate.

5. The molded case circuit breaker with an adjustable tripping structure according to claim 3, characterized in that The first drive unit (611) further comprises a first limit elastic member (64); a first notch (51) is provided on the bracket (5); the first adjusting member (61) is inserted into the first notch (51); the first adjusting member (61) forms a circumferential rotation limit fit through a first limit block (612) and a first stop block (52); the first limit elastic member (64) is respectively abutted against the bracket (5) and the first adjusting member (61) to limit the axial position of the first driving portion (611).

6. The molded case circuit breaker with an adjustable tripping structure according to claim 1, characterized in that The second release mechanism (4) comprises an armature (41), the armature (41) being provided with a release portion (42) for pushing the traction rod (2) so that the traction rod (2) rotates and releases, the adjustment structure comprising a second adjustment member (71) and a second transmission rod (72), the second adjustment member (71) being connected to the release portion (42) via the second transmission rod (72) and being used to adjust the swing distance between the release portion (42) and the traction rod (2).

7. A molded case circuit breaker with an adjustable tripping structure according to claim 6, characterized in that It also includes a second connecting elastic member (73), the second transmission rod (72) is provided with a second connecting portion (721), the second connecting portion (721) is connected to the armature (41) via the second connecting elastic member (73) and is used to adjust the swing distance between the release portion (42) and the traction rod (2), the armature (41) is swingably arranged, the armature (41) is provided with a gear slot (411), and one end of the second connecting elastic member (73) is arranged in the gear slot (411).

8. The molded case circuit breaker with an adjustable tripping structure according to claim 6, characterized in that The second adjusting member (71) comprises a second driving portion (711), and the second driving portion (711) comprises a spiral structure for driving the second transmission rod (72) to rotate.

9. A molded case circuit breaker with an adjustable tripping structure according to claim 1, characterized in that It also includes a mounting plate (53), the bracket (5) is provided with a guide groove (54) and a mounting notch (55) for easy installation, and the mounting plate (53) is inserted into the mounting notch (55) and slides with the bracket (5) through the guide groove (54).

10. The molded case circuit breaker with an adjustable tripping structure according to claim 1, characterized in that It also includes a stationary contact piece (8), the stationary contact piece (8) including a conductive portion (81) for conducting electricity in cooperation with the moving contact piece, the conductive portion (81) being bent and arranged obliquely; the stationary contact piece (8) is detachably connected to the base (1); a support block (11) is provided on the base (1), the support block (11) is arranged below the conductive portion (81) to support the conductive portion (81), or the support block (11) is arranged below the conductive portion (81) and cooperates with the conductive portion (81) through a magnetizing block (82).

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