CN220456325U

CN220456325U - Circuit board mounting structure of circuit breaker

Info

Publication number: CN220456325U
Application number: CN202322303282.XU
Authority: CN
Inventors: 俞正存; 丁新化; 郭锐; 邱腾生; 徐进勇; 陈建景
Original assignee: Zhejiang Deling Technology Co ltd
Current assignee: Zhejiang Deling Technology Co ltd
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2024-02-06
Anticipated expiration: 2033-08-25

Abstract

The utility model discloses a circuit board mounting structure of a circuit breaker, which comprises a base, a bottom plate and a circuit board, wherein a mounting cavity is formed in the back surface of the base, the circuit board is arranged in the mounting cavity, and the bottom plate is fixed with the back surface of the base to close an opening of the mounting cavity; an insulation abutting plate is arranged in the mounting cavity, a gap exists between the circuit board and the bottom plate, and the insulation abutting plate is positioned in the gap; one surface of the circuit board is propped against the bottom wall of the mounting cavity, the other surface of the circuit board is propped against one surface of the insulation propping plate, and the other surface of the insulation propping plate is propped against the bottom plate; the utility model has the characteristics of stable installation of the circuit board and the like.

Description

Circuit board mounting structure of circuit breaker

Technical Field

The utility model relates to the technical field of low-voltage electricity, in particular to a circuit board mounting structure of a circuit breaker.

Background

As one of the circuit breakers, a molded case circuit breaker is widely used in various fields. Along with the increasing requirements of users on products, the realization of a plurality of protection functions, metering functions and the like of the circuit breaker often depends on a circuit board, however, screw fastening is often adopted between the existing circuit board and a base of a shell, the fastening mode can realize stable connection between the circuit board and the base of the shell, but certain potential safety hazards can exist due to the fact that the screws are made of conductive materials generally, for example, the circuit board is short-circuited. A circuit breaker according to the disclosure of CN218069748U adopts the above structure, a space is provided on the back of the base, a circuit board is provided in the space, the circuit board is fastened to the base by a screw, and then the opening of the space is sealed by fastening the base by the screw of the base and the bottom plate, so that the circuit breaker with the above structure has the above problems.

Based on this, how to design a novel circuit board mounting structure of a circuit breaker becomes a difficult problem.

Disclosure of Invention

Therefore, the utility model aims to overcome the defects in the prior art, and aims to provide a circuit board mounting structure of a circuit breaker, so as to ensure stable circuit board mounting and better insulating performance.

The utility model provides a circuit board mounting structure of a circuit breaker, which comprises a base, a bottom plate and a circuit board, wherein a mounting cavity is formed in the back surface of the base, the circuit board is arranged in the mounting cavity, and the bottom plate is fixed with the back surface of the base to close an opening of the mounting cavity; an insulation abutting plate is arranged in the mounting cavity, a gap exists between the circuit board and the bottom plate, and the insulation abutting plate is positioned in the gap; one surface of the circuit board is propped against the bottom wall of the mounting cavity, the other surface of the circuit board is propped against one surface of the insulating propping plate, and the other surface of the insulating propping plate is propped against the bottom plate.

With this structure, the circuit board is pressed between the circuit board and the insulating pressing plate, the insulating pressing plate is pressed between the circuit board and the bottom plate, and the bottom plate is fixed with the base, so that the circuit board can be stably installed. Meanwhile, as the insulating abutting plate is made of insulating materials, the situation that the prior art possibly causes screw short circuit can be avoided. In addition to the above two effects, the circuit board is not fastened by screws, so that the corresponding procedures of mounting holes, mounting screws and the like on the base are not needed, and the production efficiency is improved in a phase-changing manner.

In some embodiments of the present application, the insulating abutment plate is a thermosetting insulating plate or a thermoplastic insulating plate or a rubber sheet.

Thermosetting insulating materials, thermoplastic insulating materials and rubber are common materials in the field, and the cost performance of the materials is high.

In some embodiments of the present application, the contact area between the insulating contact plate and the circuit board is a, the surface area of the surface of the circuit board adjacent to the insulating contact plate is a, and a is equal to or less than 0.3A and equal to or less than 0.9A.

By adopting the structure, the contact area a of the insulation contact plate and the circuit board is set to be within the interval range of 0.3A is less than or equal to a is less than or equal to 0.9A, so that the circuit board can be effectively ensured to be stably installed, and the material can be saved.

In some embodiments of the present application, the insulating abutment plate is provided with an avoidance notch, and the avoidance notch is used for avoiding the component soldering leg on the circuit board.

By adopting the structure, the notch is avoided, so that the damage of the component welding leg caused by the influence of the insulating abutting plate on the component welding leg after the insulating abutting plate is installed on the circuit board can be avoided.

In some embodiments of the present application, the base is provided with a positioning protrusion, the circuit board is provided with a first positioning hole, the insulating abutting plate is provided with a second positioning hole, and the positioning protrusion penetrates into the first positioning hole and the second positioning hole.

By adopting the structure, the design of the positioning protrusion, the first positioning hole and the second positioning hole can be adopted, and the assembly among the circuit board, the insulation abutting plate and the base can be effectively ensured.

In some embodiments of the present application, the circuit board is provided with a connector, and the insulation abutting plate is provided with a resisting portion at the circuit board near the connector.

By adopting the structure, the connector of the circuit board is generally used for plugging the module, the circuit board is easy to bend in the plugging process, the insulating abutting plate is adopted to be provided with the resisting part nearby, bending can be reduced as much as possible, namely, force during plugging the module can be transmitted to the bottom plate through the circuit board and the resisting part, and the bending degree of the circuit board can be effectively reduced.

In some embodiments of the present application, the insulating abutment plate is an integrally formed plate; or, the insulation abutting plate comprises at least two sub-boards, and the sub-boards are mutually independent or mutually connected.

By adopting the structure, the insulating abutting plate can be an integrally formed plate, an independent plate after split processing, or a plate connected after split processing.

In some embodiments of the present application, the circuit board is disposed beyond the insulating abutment plate, and a distance between each side wall of the insulating abutment plate and each side wall of the circuit board corresponding thereto is D, where D is less than or equal to 30mm.

By adopting the structure, the D is set to be not more than 30mm, and the stability of the installation of the circuit board can be better ensured.

In some embodiments of the present application, the bottom plate and the base are fixed by screws or bonded or clamped; after the bottom plate is fixed with the base, the bottom plate is leveled with the bottom surface of the base.

By adopting the structure, the screw fixation, the bonding fixation, the clamping fixation and the like can ensure the stable installation of the bottom plate and the base, thereby also ensuring the installation stability of the circuit board.

In some embodiments of the present application, the insulating abutment plate is integral with the base plate.

With this structure, the insulating contact plate and the bottom plate are made into an integral piece, which corresponds to a preferred embodiment in which the protrusion extending from the bottom plate is used to contact the circuit board.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows an exploded view of embodiment 1 of the present utility model;

FIG. 2 shows a cross-sectional view of embodiment 1 of the present utility model;

FIG. 3 is a schematic view showing the structure of the utility model after removing the bottom plate in example 1;

fig. 4 is a schematic diagram showing an insulation abutting plate and a circuit board in embodiment 1 of the present utility model;

fig. 5 shows a schematic structural diagram of a circuit board in embodiment 1 of the present utility model;

fig. 6 is a schematic view showing the structure of an insulating abutment plate in embodiment 1 of the present utility model;

fig. 7 shows another modification of the fixing manner of the base plate and the base in embodiment 1 of the present utility model.

Description of the embodiments

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Examples

Referring to fig. 1 to 7, a circuit board mounting structure of a circuit breaker can be applied to a molded case circuit breaker, wherein the molded case circuit breaker includes a conventional thermo-magnetic molded case circuit breaker, an electronic molded case circuit breaker, and a novel intelligent molded case circuit breaker, such as a measuring switch, a fusion circuit breaker, etc., and the circuit board 2 mounting structure can be used as long as the circuit board mounting structure comprises a base 1, a bottom plate 4 and a molded case circuit breaker capable of arranging a circuit board 2 on the back of the base 1.

The circuit board mounting structure comprises a base 1, a circuit board 2, an insulating abutting plate 3 and a bottom plate 4.

The front surface of the base 1 is provided with pole chambers 5 to which components such as movable and stationary contacts and arc extinguishing chambers are mounted, and in this embodiment, the number of pole chambers 5 is 3 in total. Of course, in addition to this, 2 or 4 pole chambers 5 can be used. The back of the base 1 is provided with a mounting cavity 6, in particular a mounting cavity 6 recessed in the back of the base 1, such a mounting cavity 6 being intended to receive the circuit board 2.

The bottom plate 4 is fixedly connected with the base 1 and is fixed at the opening of the installation cavity 6 to close the opening of the installation cavity 6, so that the circuit board 2 can be isolated from the outside. In the present embodiment, the base 1 is provided with an insertion groove 7 on the back surface of the base plate 4, the insertion groove 7 is located near the opening of the installation cavity 6, the base plate 4 is located in the insertion groove 7, and the base plate 4 and the base 1 are fixed by using screws 8, specifically, fastened by two screws 8. Of course, instead of fastening with screws 8, the base plate 4 may be fixed by adhesive, for example by gluing on the interface of the base plate 4 and the base 1. Of course, instead of the adhesion and the fixing by the screw 8, a clamping connection may be adopted, for example, a hook is provided on the bottom plate 4 or the base 1, and a slot is provided on the other component, and the hook may be used to clamp into the slot. Of course, this kind of fastening mode is not limited to the fastening of the undercut and the fastening groove, as shown in fig. 7, 2-4 rotatable fixing pieces 81 may be provided beside the insertion groove 7 of the base 1, and when the base plate 4 is to be installed, the fixing pieces 81 are rotated to a position deviating from the insertion groove 7 (in a dotted line structure), after the base plate 4 is placed in, the fixing pieces 81 are rotated to the insertion groove 7 to form a fastening with the base plate 4, so as to ensure that the base plate 4 is not separated from the base 1.

After the circuit board 2 is placed in the installation cavity 6, one surface of the circuit board 2 is propped against the bottom wall of the installation cavity 6, and a gap exists between the other surface of the circuit board 2 and the bottom plate 4. The insulation abutting plate 3 is in the gap, so that one surface of the insulation abutting plate 3 abuts against the circuit board 2, and the other surface abuts against the bottom plate 4, and stable installation of the circuit board 2 is ensured. The insulating contact plate 3 is made of a thermosetting material, specifically an epoxy resin plate, but of course, other thermosetting materials other than epoxy resin, such as phenol resin, urea resin, melamine resin, and the like, may be used in the present embodiment. Of course, instead of thermoplastic materials (e.g., polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.), rubber sheets may be used.

In the present embodiment, the surface area of the surface of the circuit board 2 adjacent to the insulating contact plate 3 is a, the contact area of the insulating contact plate 3 with the circuit board 2 is a (the surface area of the insulating contact plate is a), and the relationship between a and a is 0.36A. Of course, in addition to this, a may be 0.3A, 0.4A, 0.5, 0.56, 0.6, 0.67, 0.7, 0.75, 0.8, 0.88, 0.9, etc., so long as a is 0.3 a.ltoreq.a.ltoreq.0.9A is satisfied, the contact between the circuit board 2 and the insulating contact board 3 can be effectively ensured, the installation stability of the circuit board 2 is ensured, and the material can also be saved.

In this embodiment, the insulating abutting plate 3 is provided with the avoidance holes 31, the number of the avoidance holes 31 is 11, some of the avoidance holes 31 are square, some of the avoidance holes 31 are round, some of the avoidance holes are square and round, and the design of the avoidance holes 31 can accommodate the soldering feet of the components on the circuit board 2 so as to avoid the soldering feet from being damaged. Of course, the number of the escape holes 31 may be designed according to the arrangement of the actual circuit board 2 (the number of the solder fillets of the component). The shape of the avoiding hole 31 may be designed according to the arrangement of the solder tails of the components on the circuit board 2, for example, a regular shape, an irregular shape, or the like. As long as the solder fillets for accommodating the components on the circuit board 2 can be realized, and the solder fillets are prevented from being damaged.

In this embodiment, a positioning protrusion 1a is disposed on the base 1, a first positioning hole 2a is formed on the circuit board 2, a second positioning hole 3a is formed on the insulating contact plate 3, and the positioning protrusion 1a penetrates into the first positioning hole 2a and the second positioning hole 3 a. Of course, the number of the positioning projections 1a may be plural, for example, 2, 3, 4, etc., as long as the assembly of the wiring board 2, the insulating abutment plate 3, and the base 1 can be ensured.

In the present embodiment, the connector 2b is provided on the side of the wiring board 2 facing the base 1, the connector 2b is used for connecting modules, the resisting portion 3b is provided on the side of the wiring board 2 adjacent to the insulating contact plate 3, the resisting portion 3b is distributed in the vicinity of the connector 2b (the solder tail of the connector 2 b), the number of the connectors 2b is 3 here, and the number of the resisting portions 3b is also 3. With this structure, since the resisting portion 3b is designed in the vicinity of the adjacent connector 2b, the force at the time of plugging and unplugging the module is transmitted to the bottom plate 4 through the wiring board 2 and the resisting portion 3b, and the degree of bending of the wiring board 2 can be effectively reduced. Of course, the number of connectors 2b and the number of resistant portions 3b are not limited to 3, and may be designed according to practical situations.

In the present embodiment, the area of the circuit board 2 is larger than that of the insulating contact plate 3, that is, each side wall of the circuit board 2 extends beyond each side wall of the insulating contact plate 3, and the distance between the side wall of the insulating contact plate 3 and the corresponding side wall of the circuit board 2 is set to be D (including the following D1, D11, D2, D21, D3, and D4), and D is equal to or less than 30mm. Specifically, the distances D1 and D11 from the left wall of the insulating contact plate 3 to the left wall and the left protruding portion of the wiring board 2 shown in fig. 4 are exemplified, D1 is 12mm, and D11 is 19mm. Taking the distance D2 from the right wall of the insulating contact plate 3 to the right wall and the right protruding portion of the wiring board 2 as shown in fig. 4 as an example, D2 is 8mm and D21 is 24mm. Taking the distance D3 from the upper side wall of the insulating contact plate 3 to the upper side wall of the wiring board 2 shown in fig. 4 as an example, D3 is 10mm. Taking the distance D4 from the lower side wall of the insulating contact plate 3 to the lower side wall of the wiring board 2 shown in fig. 4 as an example, D4 is 1mm. Of course, D is not limited to the specific values, and the stability of the installation of the circuit board 2 can be well ensured as long as D is less than or equal to 30mm.

In the present embodiment, the insulating abutment plate 3 is an integrally formed plate. Alternatively, a separately formed plate may be used, such as two separately formed plates, which are then independent of each other; or the two plates are connected together in a clamping, inserting, buckling and other modes. Of course, the insulating contact plate 3 may be integrally formed on the bottom plate 4, and may be integrally formed with the bottom plate 4, and may extend into the bottom plate 4 to contact the circuit board 2.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. The circuit board mounting structure of the circuit breaker comprises a base, a bottom plate and a circuit board, wherein a mounting cavity is formed in the back surface of the base, the circuit board is arranged in the mounting cavity, and the bottom plate is fixed with the back surface of the base to close an opening of the mounting cavity; the method is characterized in that: an insulating abutting plate is arranged in the mounting cavity, a gap exists between the circuit board and the bottom plate, and the insulating abutting plate is positioned in the gap; one surface of the circuit board is propped against the bottom wall of the mounting cavity, the other surface of the circuit board is propped against one surface of the insulating propping plate, and the other surface of the insulating propping plate is propped against the bottom plate.

2. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: the insulation abutting plate is a thermosetting insulation material plate or a thermoplastic insulation material plate or a rubber sheet.

3. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: the abutting area of the insulation abutting plate and the circuit board is a, the surface area of the adjacent surface of the circuit board and the insulation abutting plate is A, and a is more than or equal to 0.3A and less than or equal to 0.9A.

4. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: and the insulation abutting plate is provided with an avoidance notch which is used for avoiding the welding pins of the components on the circuit board.

5. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: the base is provided with a positioning bulge, the circuit board is provided with a first positioning hole, the insulating abutting plate is provided with a second positioning hole, and the positioning bulge penetrates into the first positioning hole and the second positioning hole.

6. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: the circuit board is provided with a connector, and the circuit board near the connector is provided with a resisting part by the insulating abutting plate.

7. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: the insulation abutting plate is an integrally formed plate; or, the insulation abutting plate comprises at least two sub-boards, and the sub-boards are mutually independent or mutually connected.

8. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: the circuit board exceeds the insulating abutting plate, the distance between each side wall of the insulating abutting plate and each side wall of the corresponding circuit board is D, and D is less than or equal to 30mm.

9. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: the bottom plate and the base are fixed by screws or bonded or clamped; after the bottom plate is fixed with the base, the bottom plate is leveled with the bottom surface of the base.

10. The circuit board mounting structure of a circuit breaker according to claim 1, wherein: the insulation abutting plate and the bottom plate are integrated.