Molded case circuit breaker with pressure sampling function

Abstract

The utility model discloses a molded case circuit breaker with a pressure sampling function, which comprises a controller and a switching circuit board which are arranged on a shell, a pressure sampling transmission circuit is formed between a pressure sampling circuit structure and the controller through the switching circuit board, and an isolation structure used for connecting or disconnecting the pressure sampling transmission circuit is arranged between the controller and the switching circuit board. The isolation structure comprises at least one conducting strip arranged on the controller and at least one group of conducting bulges which are arranged on the switching circuit board at intervals and are electrically connected through the conducting strip, and when the circuit breaker is subjected to a withstand voltage test, the conducting strip can be driven to be separated from the corresponding group of conducting bulges when the controller is detached from the shell; therefore, breakdown damage to the circuit board caused by connection of the voltage acquisition transmission circuit in a voltage withstanding test can be avoided, the dielectric property is improved, the occupied space for installation is small, the installation layout of components on the circuit board is not affected, the structure is simple, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and particularly relates to a molded case circuit breaker with a pressure sampling function. Background Art

[0002] As a low-voltage power distribution system at the end of a smart grid, a molded case circuit breaker is an important part of building a strong and intelligent power grid, and has functions of overload long-time delay, short-circuit instantaneous, and under-voltage protection, which can protect lines and power supply equipment from damage. With the increasing requirements for the intelligence of molded case circuit breakers, they also have functions of signal acquisition, remote control, remote measurement, and remote adjustment. Currently, the method is to install a control unit in the circuit breaker. The control unit mainly consists of a controller and a circuit board, and the controller is pluggable and set on the circuit breaker.

[0003] Existing molded case circuit breakers are widely used in the solar photovoltaic power generation industry in cooperation with new energy equipment, which requires voltage sampling on both the incoming line side and / or the outgoing line side of the molded case circuit breaker. Currently, the incoming line side pressure sampling line and the outgoing line side pressure sampling line are connected to the circuit board, and voltage parameters can be obtained by connecting the controller to the circuit board, and at the same time, power can be supplied to the controller. However, in order to prevent the pressure sampling line from conducting during the power frequency withstand voltage test of the product and causing breakdown of the circuit board, the controller is connected to the incoming line side pressure sampling line and the outgoing line side pressure sampling line by means of a connector. When the controller is inserted into the circuit breaker, the incoming line side and the outgoing line side pressure sampling lines are connected, and when the controller is pulled out of the circuit breaker, the incoming line side and the outgoing line side pressure sampling lines are disconnected. This connector consists of a male plug and a female socket respectively set on the controller and the circuit board. The whole connector is large in volume, occupies a large space on the circuit board, will affect the installation layout of electronic components on the circuit board, has a high setting cost, and the adjacent pins on the connector are relatively close, which will also cause the situation of insufficient phase-to-phase electrical distance. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the connection between the controller and the pressure sampling line in the prior art is realized by means of a connector, which is large in volume, occupies a large space on the circuit board, affects the installation layout of electronic components on the circuit board, and has a high setting cost.

[0005] To solve the above technical problem, the utility model provides a molded case circuit breaker with a pressure sampling function, which includes a housing, a controller and a transfer circuit board arranged in the housing. The controller and the transfer circuit board form a pluggable connection on the housing. The pressure sampling line structure of the circuit breaker is connected to the transfer circuit board, and a pressure sampling transmission circuit is formed between the transfer circuit board and the controller.

[0006] An isolation structure for connecting or disconnecting the pressure acquisition transmission circuit is provided between the controller and the adapter circuit board. The isolation structure includes at least one conductive sheet disposed on the controller, and at least one set of conductive protrusions spaced apart on the adapter circuit board and electrically connected through the conductive sheet. The conductive protrusions and the conductive sheet are cooperatively connected in series to the pressure acquisition transmission circuit. When the controller is inserted into the housing, the conductive sheet is driven to contact a set of the conductive protrusions, and when the controller is separated from the housing, the conductive sheet is driven to separate from a set of the conductive protrusions.

[0007] In the above-mentioned molded case circuit breaker, each set of the conductive protrusions includes two thimble structures oppositely disposed on the adapter circuit board.

[0008] In the above-mentioned molded case circuit breaker, the conductive sheet is disposed at the bottom of the controller and is vertically opposite to the two thimble structures.

[0009] In the above-mentioned molded case circuit breaker, the conductive sheet is embedded at the bottom of the controller, and two slot structures are provided at positions corresponding to both ends of the conductive sheet at the bottom of the controller, so that the corresponding two thimble structures are inserted into the two slot structures and connected to the conductive sheet.

[0010] In the above-mentioned molded case circuit breaker, the pressure acquisition line structure includes three outgoing line side pressure acquisition lines for acquiring the voltage information on the outgoing line side of the circuit breaker. The isolation structure includes an outgoing line side isolation unit disposed on the adapter circuit board and connected to the outgoing line side pressure acquisition lines. The outgoing line side isolation unit includes three sets of conductive protrusions respectively connected to the three outgoing line side pressure acquisition lines, and the three sets of conductive protrusions are spaced apart and arranged on the adapter circuit board.

[0011] In the above-mentioned molded case circuit breaker, the pressure acquisition line structure includes three incoming line side pressure acquisition lines for acquiring the voltage information on the incoming line side of the circuit breaker. The isolation structure includes an incoming line side isolation unit disposed on the adapter circuit board and connected to the incoming line side pressure acquisition lines. The incoming line side isolation unit includes three sets of conductive protrusions respectively connected to the three incoming line side pressure acquisition lines.

[0012] In the above-mentioned molded case circuit breaker, the housing includes a middle cover and a base. The middle cover is provided with an installation cavity suitable for installing the adapter circuit board and the controller, and the controller is installed on the top of the middle cover and covers the installation cavity.

[0013] In the above-mentioned molded case circuit breaker, a pluggable connection is formed between the controller and the adapter circuit board through a connector structure.

[0014] In the above-mentioned molded case circuit breaker, the middle cover includes a bottom boss protruding from the bottom thereof, a bottom groove is formed in the mounting cavity corresponding to the position of the bottom boss, a plurality of connectors accommodated in the bottom groove are provided on the adapter circuit board, and a connecting hole connected to the bottom groove is provided on the bottom boss, so that the pressure sampling circuit structure passes through the connecting hole into the bottom groove and is connected to the connector.

[0015] In the above-mentioned molded case circuit breaker, the controller and the middle cover form a top groove located on one side of the controller, and the handle and the electric operating mechanism of the circuit breaker are arranged in the top groove.

[0016] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0017] 1. In the molded case circuit breaker provided by the utility model, the pressure collection line structure of the circuit breaker is connected to the adapter circuit board, and the pressure collection line structure, the adapter circuit board and the controller are connected to form a pressure collection transmission circuit, and the isolation structure is used to connect or disconnect the pressure collection transmission circuit. The isolation structure is composed of at least one group of conductive protrusions arranged at intervals on the adapter circuit board and at least one conductive sheet arranged on the controller. The advantage of adopting this technical solution is that when the controller is installed on the shell, the conductive sheet contacts the corresponding group of conductive protrusions to realize the connection of the pressure collection transmission circuit, so that the controller can receive and obtain the voltage information of the circuit breaker; when the circuit breaker is subjected to a withstand voltage test, the controller is removed from the shell to drive the conductive sheet to separate from the corresponding group of conductive protrusions, thereby cutting off the pressure collection transmission circuit, so that the pressure collection transmission circuit can be avoided from being damaged by the breakdown of the circuit board due to the connection during the withstand voltage test, and the dielectric performance is improved. Such a design omits the traditional connector structure composed of a male plug and a female socket, and the installation occupies a small space, so as not to affect the installation layout of components on the circuit board, and the structure is simple, which is conducive to reducing costs.

[0018] 2. In the molded case circuit breaker provided by the utility model, each group of conductive protrusions includes two ejector structures relatively arranged on the adapter circuit board, and the conductive sheet is arranged at the bottom of the controller. When the controller is installed and inserted into the shell, the conductive sheet is driven to connect the two ejector structures, thereby connecting the voltage transmission circuit and ensuring the normal power supply to the controller and the adapter circuit board; and when the controller is pulled out of the shell, the conductive sheet will be driven to separate from the two ejector structures, thereby disconnecting the voltage transmission circuit, thereby protecting the safety of the adapter circuit board during the withstand voltage test. The isolation structure of the present technical solution adopts the ejector structure to contact or separate with the conductive sheet at the bottom of the controller to realize the on-off control of the voltage transmission circuit. This ejector structure occupies a very small space on the circuit board and can be reasonably arranged according to the structural layout of the circuit board, so that the opening distance between the two ejector structures is designed to be greater than the terminal spacing of the traditional connector, which can ensure a safe electrical distance, thereby reducing the number of connectors between the controller and the adapter circuit board, improving the dielectric performance, and meeting the requirements of the product impact withstand voltage test.

[0019] 3. In the molded case circuit breaker provided by the utility model, a plurality of connectors accommodated in the bottom groove are provided on the adapter circuit board, and a connecting hole connected to the bottom groove is opened on the bottom boss, so that the pressure collection line structure is inserted into the bottom groove and connected to the connector. The pressure collection line structure of this structural design and the adapter circuit board adopt a connector form to realize quick plug-in connection, so as to achieve modular and convenient installation effects, make installation and use more flexible, improve installation efficiency, and at the same time avoid the line from being crushed during installation, which has a good protective effect on the line. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of the molded case circuit breaker provided by the utility model;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of the isolation component of the utility model;

[0023] Figure 3 It is a schematic diagram of the installation structure of the transfer circuit board of the utility model on the middle cover;

[0024] Figure 4 It is a partial enlarged structural schematic diagram of the transfer circuit board of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the bottom direction of the middle cover of the utility model.

[0026] Explanation of the reference numerals: 1. middle cover; 11. bottom boss; 12. bottom groove; 13. top groove; 14. connection hole; 2. controller; 3. adapter circuit board; 4. conductive sheet; 5. conductive protrusion; 51. ejector pin structure; 6. slot structure; 7. mounting cavity; 8. connector. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Example

[0032] The present embodiment is described in detail below with reference to the accompanying drawings:

[0033] This embodiment provides Figures 1-5A plastic case circuit breaker with a pressure sampling function as shown includes a case, a controller 2 and a transfer circuit board 3 disposed in the case. The controller 2 and the transfer circuit board 3 form a pluggable connection on the case. The pressure sampling circuit structure of the circuit breaker is connected to the transfer circuit board 3, and a pressure sampling transmission circuit is formed between the transfer circuit board 3 and the controller 2. An isolation structure for connecting or disconnecting the pressure sampling transmission circuit is provided between the controller 2 and the transfer circuit board 3. The isolation structure includes at least one conductive sheet 4 disposed on the controller 2 and at least one set of conductive protrusions 5 spaced apart on the transfer circuit board 3 and electrically connected through the conductive sheet 4. The conductive protrusions 5 and the conductive sheet 4 are cooperatively connected in series on the pressure sampling transmission circuit. When the controller 2 is inserted into the case, the conductive sheet 4 is driven to contact a set of the conductive protrusions 5, and when the controller 2 is separated from the case, the conductive sheet 4 is driven to separate from a set of the conductive protrusions 5.

[0034] The above embodiment is the core technical solution of this embodiment. The pressure sampling circuit structure of the circuit breaker is connected to the transfer circuit board 3, and a pressure sampling transmission circuit is formed by connecting the pressure sampling circuit structure, the transfer circuit board 3 and the controller 2. The isolation structure is used to connect or disconnect the pressure sampling transmission circuit. This isolation structure is composed of at least one set of conductive protrusions 5 spaced apart on the transfer circuit board 3 and at least one conductive sheet 4 disposed on the controller 2. The advantage of adopting this technical solution is that when the controller 2 is installed in the case, the pressure sampling transmission circuit is connected by the contact between the conductive sheet 4 and a corresponding set of conductive protrusions 5, so that the controller 2 can receive and obtain the voltage information of the circuit breaker. When the circuit breaker is subjected to a withstand voltage test, the controller 2 is removed from the case and the conductive sheet 4 is driven to separate from a corresponding set of conductive protrusions 5, thereby cutting off the pressure sampling transmission circuit. This can avoid the breakdown damage to the circuit board caused by the connection of the pressure sampling transmission circuit during the withstand voltage test, improve the dielectric performance. Such a design omits the connector structure composed of a male plug and a female socket in the traditional way, occupies a small installation space, thus does not affect the installation layout of the components on the circuit board, and has a simple structure, which is beneficial to reducing costs.

[0035] The following will be combined with Figures 2-4 to make a detailed description of the specific setting direction of the conductive protrusions:

[0036] According to the three-phase line structure design adopted by the molded case circuit breaker, in order to collect the three-phase line voltage information of the circuit breaker, it is usually necessary to set up three voltage sampling lines, and three groups of conductive protrusions 5 are correspondingly provided on the transfer circuit board 3, and three conductive sheets 4 cooperating with the three groups of conductive protrusions 5 are provided on the controller 2, wherein each group of the conductive protrusions 5 includes two ejector structures 51 arranged on the transfer circuit board 3, and the two ejector structures 51 are not conductive, and the conductive sheet 4 is arranged at the bottom of the controller 2 and is opposite to the corresponding two ejector structures 51. With this structural setting, when the controller 2 is installed and inserted into the housing, the conductive sheet 4 is driven to connect the two ejector structures 51, thereby connecting the voltage sampling transmission circuit, and at the same time ensuring the normal power supply to the controller 2 and the transfer circuit board 3; and when the controller 2 is pulled out of the housing, the conductive sheet 4 is driven to separate from the two ejector structures 51, thereby disconnecting the voltage sampling transmission circuit, thereby protecting the safety of the transfer circuit board 3 during the withstand voltage test. The isolation structure of this embodiment adopts the form of a pin structure 51 to cooperate with the conductive sheet 4 at the bottom of the controller 2 to contact or separate, so as to realize the on-off control of the voltage transmission circuit. This pin structure 51 occupies a very small space on the circuit board and can be reasonably arranged according to the structural layout of the circuit board. The spacing between the two pin structures 51 is designed to be larger than the terminal spacing of the traditional connector, which can ensure a safe electrical distance, thereby reducing the number of connectors between the controller 2 and the adapter circuit board 3, improving the dielectric performance, and meeting the requirements of the product impact withstand voltage test.

[0037] As a preferred embodiment, in order to collect the three-phase voltage information on the outgoing side of the circuit breaker, the pressure sampling line structure includes three outgoing side pressure sampling lines for collecting the voltage information on the outgoing side of the circuit breaker, and the isolation structure includes an outgoing side isolation unit arranged on the adapter circuit board 3 and connected to the outgoing side pressure sampling line. The outgoing side isolation unit includes three groups of conductive protrusions 5 respectively connected to the three outgoing side pressure sampling lines. The three groups of conductive protrusions 5 are arranged at intervals on the adapter circuit board 3, that is, three groups of ejector structures 51 opposite to each other are arranged on the adapter circuit board 3. Such an installation layout can ensure the safe electrical distance between the two ejector structures 51 distributed on the left and right, and can also ensure the safe electrical distance between the same poles between the two ejector structures 51 distributed front and back.

[0038] It is further preferred that, in order to collect the three-phase voltage information on the incoming side of the circuit breaker, the voltage sampling circuit structure includes three incoming side voltage sampling circuits for collecting the voltage information on the incoming side of the circuit breaker, and the isolation structure includes an incoming side isolation unit provided on the transfer circuit board 3 and connected to the incoming side voltage sampling circuit, the incoming side isolation unit includes three groups of conductive protrusions 5 respectively connected to the three incoming side voltage sampling circuits, and three groups of ejector pin structures 51 opposite to each other are also provided on the transfer circuit board 3. It can be seen from the above that, in the case where voltage collection is required for both the incoming side and the outgoing side of the molded case circuit breaker, the transfer circuit board needs to be provided with a total of six groups of ejector pin structures 51 opposite to each other, corresponding to the six conductive sheets 4 provided at the bottom of the controller, so as to meet the on-off setting requirements of multiple voltage sampling circuits.

[0039] In this embodiment, the housing includes a middle cover 1 and a base, and the base is arranged at the bottom of the middle cover. Figures 1-3 The middle cover 1 is provided with an installation cavity 7 suitable for installing the adapter circuit board 3 and the controller 2. The controller 2 is installed on the top of the middle cover and covers the installation cavity 7. Specifically, the controller 2 and the adapter circuit board 3 form a plug-in connection through a connector structure. The controller 2 and the middle cover 1 form a top groove 13 located on one side of the controller 2. The handle and electric operating mechanism of the circuit breaker are arranged in the top groove 13. The electric operating mechanism is used to drive the handle to perform automatic opening and closing operations. The controller arranged in this way can realize independent plug-in and pull-out at the middle cover position, which is conducive to standardized production. At the same time, it is convenient to disassemble and assemble, and easy to maintain and repair.

[0040] Further preferably, in combination with Figure 2 and Figure 4As shown, the middle cover 1 includes a bottom boss 11 protruding from the bottom thereof, a bottom groove 12 is formed in the mounting cavity 7 at a position corresponding to the bottom boss 11, a plurality of connectors 8 accommodated in the bottom groove 12 are provided on the adapter circuit board 3, a connecting hole 14 connected to the bottom groove 12 is provided on the bottom boss 11, and a position space is reserved for the connector 8 by designing the bottom groove 12. In this structural arrangement, the pressure-collecting line structure is connected to the incoming line terminal and / or the outgoing line terminal of the circuit breaker, so that the pressure-collecting line structure penetrates into the bottom groove 12 through the connecting hole 14 and is connected to the connector 8, thereby realizing the electrical connection between the pressure-collecting line structure and the adapter circuit board 3. Since the adapter circuit board 3 is electrically connected to the controller 2, the controller 2 can collect voltage information of the three-phase main circuit of the circuit breaker through the pressure-collecting line structure to enhance the monitoring of the power quality. This structural design uses connectors between the pressure-collecting line structure and the adapter circuit board to achieve quick plug-in and unplug connection, achieving modular and convenient installation effects. The installation and use are more flexible, and the installation efficiency is improved. At the same time, it avoids the line from being crushed during installation, and has a good protective effect on the line.

[0041] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A plastic case circuit breaker with a pressure sampling function, comprising a housing and a controller (2) and a transfer circuit board (3) arranged in the housing. The controller (2) and the transfer circuit board (3) form a pluggable connection on the housing. The pressure sampling circuit structure of the circuit breaker is connected to the transfer circuit board (3), and a pressure sampling transmission circuit is formed between the transfer circuit board (3) and the controller (2). It is characterized in that: An isolation structure for connecting or disconnecting the pressure sampling transmission circuit is arranged between the controller (2) and the transfer circuit board (3). The isolation structure includes at least one conductive sheet (4) arranged on the controller (2), and at least one group of conductive protrusions (5) arranged at intervals on the transfer circuit board (3) and electrically connected through the conductive sheet (4). The conductive protrusions (5) and the conductive sheet (4) are cooperatively connected in series on the pressure sampling transmission circuit. When the controller (2) is inserted into the housing, the conductive sheet (4) is driven to contact a group of the conductive protrusions (5), and when the controller (2) is separated from the housing, the conductive sheet (4) is driven to separate from a group of the conductive protrusions (5).

2. The plastic case circuit breaker with pressure-taking function according to claim 1, characterized in that: Each group of the conductive protrusions (5) includes two thimble structures (51) oppositely arranged on the transfer circuit board (3).

3. The plastic case circuit breaker with pressure sampling function according to claim 2, characterized in that: The conductive sheet (4) is arranged at the bottom of the controller (2) and is vertically opposite to the two thimble structures (51).

4. The plastic case circuit breaker with pressure-taking function according to claim 3, characterized in that: The conductive sheet (4) is buried at the bottom of the controller (2). Two slot structures (6) are arranged at the positions corresponding to both ends of the conductive sheet (4) at the bottom of the controller (2), so that the corresponding two thimble structures (51) are inserted into the two slot structures (6) to be connected to the conductive sheet (4).

5. The plastic case circuit breaker with a pressure-taking function according to any one of claims 1-4, characterized in that: The pressure sampling circuit structure includes three outgoing line side pressure sampling lines for collecting the voltage information on the outgoing line side of the circuit breaker. The isolation structure includes an outgoing line side isolation unit arranged on the transfer circuit board (3) and connected to the outgoing line side pressure sampling lines. The outgoing line side isolation unit includes three groups of conductive protrusions (5) respectively connected to the three outgoing line side pressure sampling lines, and these three groups of conductive protrusions (5) are arranged at intervals on the transfer circuit board (3).

6. The plastic case circuit breaker with pressure-taking function according to any one of claims 1-4, characterized in that: The pressure sampling circuit structure includes three incoming line side pressure sampling lines for collecting the voltage information on the incoming line side of the circuit breaker. The isolation structure includes an incoming line side isolation unit arranged on the transfer circuit board (3) and connected to the incoming line side pressure sampling lines. The incoming line side isolation unit includes three groups of conductive protrusions (5) respectively connected to the three incoming line side pressure sampling lines.

7. The plastic case circuit breaker with a pressure-taking function according to claim 1, wherein: The housing includes a middle cover (1). The middle cover (1) is provided with an installation cavity (7) suitable for installing the transfer circuit board (3) and the controller (2). The controller (2) is installed on the top of the middle cover (1) and covers the installation cavity (7).

8. The plastic case circuit breaker with pressure-taking function according to claim 7, characterized in that: The controller (2) and the transfer circuit board (3) form a pluggable connection through a connector structure.

9. The plastic case circuit breaker with pressure sampling function according to claim 8, characterized in that: The middle cover (1) includes a bottom boss (11) protruding from its bottom. A bottom groove (12) is formed in the installation cavity (7) corresponding to the position of the bottom boss (11). A plurality of connectors (8) are provided on the adapter circuit board (3) and accommodated in the bottom groove (12). A connection hole (14) communicating with the bottom groove (12) is formed in the bottom boss (11), so that the pressure collection circuit structure passes through the connection hole (14) and penetrates into the bottom groove (12) to be connected to the connector (8).

10. The plastic case circuit breaker with pressure-taking function according to any one of claims 7-9, characterized in that: The controller (2) and the middle cover (1) form a top groove (13) on one side of the controller (2). The handle of the circuit breaker and the electric operating mechanism are arranged in the top groove (13).

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