CN109243928B - Mechanism embedded molded case circuit breaker - Google Patents

Abstract

The invention discloses a mechanism embedded molded case circuit breaker, which comprises a base, a middle cover and an upper cover, wherein the middle cover is arranged on the base; the circuit breaker handle extends out of the handle perforation, and the opening and closing operating mechanism comprises a motor device, a control circuit board, a screw rod assembly, a transmission plate and a mounting frame; the motor device and the screw rod assembly are arranged on the mounting frame to form an assembly, the assembly is arranged in the first accommodating concave cavity, and the control circuit board is arranged in the second accommodating concave cavity; the screw rod assembly comprises a screw rod and a moving block, one end of a transmission plate is fixedly connected with the moving block, a handle sleeve hole is formed in the other end of the transmission plate, and a breaker handle is positioned in the handle sleeve hole; the control circuit board is electrically connected with a closing position switch, a separating position switch and an initial position switch, and the transmission plate/moving block is fixed with a triggering part. The mechanism embedded molded case circuit breaker has reasonable structural design, is beneficial to miniaturization design of products and has good use effect.

Description

Mechanical embedded molded case circuit breaker

Technical field

The invention relates to a mechanism-embedded plastic case circuit breaker, belonging to the field of circuit breaker structural design.

Background technique

Molded case circuit breakers are often used as terminal switches or branch switches in low-voltage power distribution systems to provide real-time protection for power lines and mechanical equipment. They can automatically cut off the circuit when overloads, short circuits or undervoltage faults occur in lines and equipment. . A variety of electric/manual dual-purpose opening and closing operating devices for molded case circuit breakers have been disclosed in the prior art. In order to achieve switching between manual opening and closing operations and electric opening and closing operations, manual/electric switching is required. Mechanism, for example, patent document CN202772078U discloses a circuit breaker opening and closing operating device, including a manual operating mechanism, an electric operating mechanism, and a manual/electric switching mechanism. In the above-mentioned patent documents, a manual/electric switching mechanism is provided to switch between manual opening and closing and electric opening and closing operating modes, so that electric opening and closing and manual opening and closing can be performed according to actual conditions during actual use.

There are the following problems when installing the above-mentioned circuit breaker opening and closing operating device in the circuit breaker housing:

First of all, after the circuit breaker opening and closing operating device is installed, the entire opening and closing operating device protrudes from the upper surface of the middle cover, and the height of the upper cover needs to be increased to cover the opening and closing operating device, causing the entire plastic case to be disconnected. The appearance size of the device (mainly reflected in the height dimension) is difficult to reduce, so it is not conducive to the miniaturization design of the product; secondly, during actual use, the staff must manually operate the manual/electric switching mechanism before manual opening and closing operations. Switch the opening and closing operation mode to the manual opening and closing operation mode, and then pull the operating handle to manually open or close the circuit breaker. If you need to switch to the electric opening and closing operation mode, you need to operate the manual/electric switch again. The mechanism switches to the electric opening and closing operation mode, which requires many steps and is inconvenient to operate. Moreover, staff who are not familiar with the operation of the circuit breaker are prone to incorrect operations, especially in emergencies.

Contents of the invention

In this regard, the present invention aims to provide a molded case circuit breaker with a reasonable structural design, which is conducive to product miniaturization design, easy opening and closing operations, and has good use effects.

The technical solution to achieve the purpose of the present invention is:

A mechanism-embedded molded case circuit breaker includes a base, a middle cover installed on the upper part of the base, and an upper cover installed on the upper part of the middle cover. The middle cover is equipped with an opening and closing operating mechanism; the middle cover and the The upper cover is provided with a handle perforation at a relative position, and the circuit breaker handle protrudes from the handle perforation. The opening and closing operating mechanism includes a motor device, a control circuit board, a screw assembly, a transmission plate and a mounting frame. The upper part of the cover is provided with a first accommodation cavity and a second accommodation cavity that are recessed downward; the motor device and the screw rod assembly are installed on the mounting frame to form an assembly, and the assembly is installed on the first accommodation cavity. In the cavity, the control circuit board is installed in the second accommodation cavity; the control circuit board is electrically connected to the motor device, and the screw rod assembly includes a screw rod driven to rotate by the motor device and A moving block that cooperates with the screw rod, one end of the transmission plate is fixedly connected to the moving block, the other end of the transmission plate is provided with a handle sleeve hole, and the circuit breaker handle is located in the handle sleeve hole, When the motor device rotates, it drives the transmission plate to move linearly along the axis of the screw; there are three switches electrically connected to the control circuit board, and the three switches are spaced apart along the axis of the screw. The switches are respectively a closing position switch, an opening position switch and an initial position switch. The initial position switch is located between the closing position switch and the opening position switch. A triggering component suitable for triggering each switch is fixed. When the triggering component is in the position of triggering the initial position switch, there is a gap between the hole wall of the handle sleeve hole and the circuit breaker handle for the circuit breaker to The handle is manually switched between the closing position and the opening position to realize manual opening and closing; when electric closing or electric opening, the control circuit board controls the rotation of the motor device and drives the screw rod to rotate, and then The transmission plate and the triggering component are driven to move synchronously along the axial direction of the screw rod. When the triggering component moves to trigger the closing position switch or the opening position switch, at the same time, the transmission plate pushes the circuit breaker. When the closing position switch or the opening position switch is triggered, the control circuit board controls the motor device to rotate in the opposite direction to drive the screw rod to rotate in the opposite direction. The driving plate and the triggering component are driven to move in the reverse direction until the control circuit board controls the motor device to stop rotating when the triggering component triggers the initial position switch.

In the above technical solution, the motor device includes a drive motor and a reduction gear set. The input gear of the reduction gear set is fixed on the motor shaft of the drive motor. The output gear of the reduction gear set is fixed on the screw rod. end.

In the above technical solution, the mounting frame is also provided with a guide structure that provides guidance for the movement of the moving block.

In the above technical solution, the guide structure is a guide rod provided on the mounting frame in the same direction as the screw rod, and the moving block has a groove that matches the guide rod.

In the above technical solution, the upper part of the middle cover is provided with a support table adjacent to the handle of the circuit breaker, the upper part of the middle cover is provided with limiting parts on both sides of the transmission plate, and the limiting parts are provided with "7" ""-shaped limit hook plate, the limit hook plate cooperates with the support table to limit the position of the transmission plate.

In the above technical solution, the mounting bracket is fixed in the first accommodation cavity through fixing screws;

A limiting slot is provided on the side wall of the first accommodation cavity, and a clamping portion is provided on the mounting bracket to cooperate with the limiting slot.

The invention has positive effects: In the solution of the invention, firstly, the opening and closing operating mechanism is basically embedded and installed inside the middle cover, occupying no or very little space above the upper surface of the middle cover, and reducing the height dimension of the upper cover. , the structure is compact and reasonable, which is conducive to product miniaturization design (mainly reduced height and size); secondly, after the electric opening or closing is completed, the trigger component always moves to the position where the initial position switch is triggered, and when the trigger component reaches When the position of the initial position switch is triggered, there is the gap between the circuit breaker handle and the handle hole wall, so that the circuit breaker handle can be directly manually pulled to switch between the closing position and the opening position at this time and It is not interfered by the transmission plate. In other words, the circuit breaker handle and the transmission plate are not linked at this time and can be freely opened and closed manually, thus improving the convenience of opening and closing operations and eliminating the need for external manual/electric switching. The mechanism can be used to manually switch the operating mode, which can effectively avoid misoperation caused by this, and has a very good use effect.

Description of drawings

Figure 1 is a perspective view of the embedded molded case circuit breaker in the present invention;

Figure 2 is a top view of the embedded molded case circuit breaker with the mechanism shown in Figure 1;

Figure 3 is a cross-sectional view taken along line A-A in Figure 2;

Figure 4 is a perspective view of the embedded molded case circuit breaker in the present invention with the upper cover removed;

Figure 5 is a schematic structural diagram of the middle cover of the present invention;

Figure 6 is a schematic structural diagram of the limiting component in the present invention;

Figure 7 is a front view of the opening and closing operating mechanism of the present invention;

Figure 8 is a perspective view of the opening and closing operating mechanism shown in Figure 7;

Figure 9 is a front view of the opening and closing operating mechanism in Figure 7 with some parts omitted;

Figure 10 is an assembly diagram of the screw rod, moving block and guide block in the present invention;

Figure 11 is a schematic structural diagram of the mounting bracket in the present invention;

Figure 12 is a schematic structural diagram of the transmission plate in the present invention.

The reference numbers shown in the figure are: 01-base; 02-middle cover; 021-first accommodation cavity; 022-second accommodation cavity; 023-support table; 024-limiting slot; 03-upper cover ;04-Handle perforation; 05-Control circuit board; 06-Limiting component; 061-Limiting hook plate; 1-Motor device; 11-Driving motor; 12-Reduction gear set; 13-Input gear; 14-Output gear ; 2-Transmission plate; 21-Hole set hole; 3-Circuit breaker handle; 4-Screw rod; 5-Moving block; 51-Slot; 6-Close position switch; 7-Open position switch; 8-Initial position Switch; 9-trigger component; 10-mounting bracket; 101-guide rod; 102-clipping part.

Detailed ways

The specific structure of the present invention will be described below in conjunction with the accompanying drawings:

A mechanism-embedded molded case circuit breaker, as shown in Figures 1 to 9, includes a base 01, a middle cover 02 installed on the upper part of the base 01, and an upper cover 03 installed on the upper part of the middle cover 02. The middle cover 02 is equipped with an opening and closing operating mechanism; the middle cover 02 and the upper cover 03 are provided with handle perforations 04 at relative positions, and the circuit breaker handle 3 extends from the handle perforations 04. The opening and closing operating mechanisms include Motor device 1, control circuit board 05, screw assembly, transmission plate 2 and mounting bracket 10. The upper part of the middle cover 02 is provided with a first accommodation cavity 021 and a second accommodation cavity 022 that are recessed downwards; the motor The device 1 and the screw assembly are installed on the mounting bracket 10 to form an assembly. The assembly is installed in the first accommodation cavity 021, and the control circuit board 05 is installed in the second accommodation cavity 022. The control circuit board 05 is electrically connected to the motor device 1. The screw assembly includes a screw 4 driven to rotate by the motor device 1 and a moving block 5 that cooperates with the screw 4. One end of the transmission plate 2 is fixedly connected to the moving block 5, and the other end of the transmission plate 2 is provided with a handle sleeve hole 21. The circuit breaker handle 3 is located in the handle sleeve hole 21, and the motor device 1 rotates The transmission plate 2 is driven to make linear motion along the axis of the screw 4; the control circuit board 05 is electrically connected to three switches, and the three switches are spaced along the axis of the screw 4. They are closing position switch 6, opening position switch 7 and initial position switch 8 respectively. The initial position switch 8 is located between the closing position switch 6 and the opening position switch 7. The transmission plate 2 /The moving block 5 is fixed with a trigger component 9 suitable for triggering each switch. When the trigger component 9 is in the position of triggering the initial position switch 8, the hole wall of the handle sleeve hole 21 is in contact with the circuit breaker. There is enough space between the circuit breaker handles 3 for the circuit breaker handle 3 to be manually switched between the closing position and the opening position without being interfered by the transmission plate 2, so as to realize manual opening and closing; electric closing or electric opening When, the control circuit board 05 controls the motor device 1 to rotate and drives the screw rod 4 to rotate, thereby driving the transmission plate 2 and the trigger component 9 to move synchronously along the axial direction of the screw rod 4. When the trigger When the component 9 moves to trigger the closing position switch 6 or the opening position switch 7, at the same time, the transmission plate 2 pushes the circuit breaker handle 3 to the closing position or the opening position, and the closing position switch 6. Or after the opening position switch 7 is triggered, the control circuit board 05 controls the motor device 1 to rotate in the reverse direction to drive the screw rod 4 to rotate in the reverse direction to drive the transmission plate 2 and the triggering component 9 in the reverse direction. Move until the triggering component 9 triggers the initial position switch 8 and the control circuit board 05 controls the motor device 1 to stop rotating. In the solution of this embodiment, firstly, the opening and closing operating mechanism is basically embedded and installed inside the middle cover, occupying no or very little height space above the upper surface of the middle cover, reducing the height dimension of the upper cover, and having a compact and reasonable structure, which is conducive to Product miniaturization design (mainly reduced height and size); secondly, when the opening and closing operating mechanism is running, when the electric opening or closing is completed, the triggering component 9 always moves to the position where the initial position switch 8 is triggered , and when the trigger component 9 is in the position of triggering the initial position switch 8, there is the gap between the circuit breaker handle 3 and the hole wall of the handle cover hole 21, so that at this time, the upper cover 03 can be manually pulled directly from outside The circuit breaker handle 3 switches between the closing position and the opening position without being interfered by the transmission plate 2. In other words, the circuit breaker handle and the transmission pole are not linked at this time and can be freely opened and closed manually, thereby improving It improves the convenience of opening and closing operations without setting up a manual/electric switching mechanism to manually switch the opening and closing operating modes, thereby effectively avoiding misoperations caused by this and having good use effects. There is no need to set up an external manual/electric switching mechanism to manually switch the operating mode, which can effectively avoid misoperation caused by this, and has a good use effect.

The three switches used in this embodiment can be existing switches such as micro switches and photoelectric switches. The drive motor uses a micro DC motor, which has high efficiency, small size, and is easy to install.

In this embodiment, the motor device 1 includes a drive motor 11 and a reduction gear set 12. The drive motor 11 is transversely installed in the first accommodation cavity 021. The input gear 13 of the reduction gear set 12 is fixed on On the motor shaft of the driving motor 11, the output gear 14 of the reduction gear set 12 is fixed at the end of the screw rod 4, so that the output speed of the driving motor 11 is adjusted to After the appropriate rotation speed, it is output to the screw 4.

Furthermore, the mounting frame 10 is also provided with a guide structure that provides guidance for the movement of the moving block 5. Specifically, the two ends of the screw rod 4 are connected to the two side walls of the mounting frame 10 through bearings. , each gear constituting the reduction gear set is rotatably mounted on a side wall plate of the mounting frame 10 through a mounting shaft, and the driving motor 11 is fixed on the side wall plate of the mounting frame 10 through screws. Using the above structure, when assembling the opening and closing operating mechanism, first install the drive motor 11 and the reduction gear set 12 on the mounting bracket, and then fix the mounting bracket on the middle cover of the circuit breaker during later assembly to facilitate later assembly. Assemble.

As a further improvement of the above embodiment, the guide structure is a guide rod 101 provided on the mounting bracket 10 in the same direction as the screw rod 4 , and the moving block 5 has a guide rod 101 that cooperates with the guide rod 101 . The groove 51 is matched with the groove 51 through the guide rod 101, so that when the screw rod 4 rotates, under the guidance of the guide rod 101, it is ensured that the moving block 5 can only move along the axis of the screw rod 4 and cannot rotate circumferentially. .

The upper part of the middle cover 02 is provided with a support table 023 adjacent to the position of the circuit breaker handle 3. The upper part of the middle cover 02 is provided with limiting components 06 on both sides of the transmission plate 2. The limiting component 06 is provided with a support table 023. A "7"-shaped limiting hook plate 061 cooperates with the support table 023 to limit the transmission plate 2 to prevent the transmission plate 2 from deflecting, and does not affect the movement of the transmission plate 2 Move normally.

The mounting bracket 10 is fixed in the first accommodation cavity 021 by fixing screws; a limit slot 024 is provided on the side wall of the first accommodation cavity 021, and the mounting bracket 10 has a limit slot 024 on the side wall of the first accommodation cavity 021. The engaging portion 102 fits into the engaging slot 024 .

Obviously, the above-mentioned embodiments of the present invention are only examples to clearly illustrate the present invention, and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. An exhaustive list of all implementations is neither necessary nor possible. However, these obvious changes or changes derived from the essential spirit of the present invention still belong to the protection scope of the present invention.

Claims (4)

1. The mechanism embedded molded case circuit breaker comprises a base (01), a middle cover (02) arranged on the upper part of the base (01) and an upper cover (03) arranged on the upper part of the middle cover (02), wherein an opening and closing operation mechanism is arranged on the middle cover (02); the circuit breaker is characterized in that the opening and closing operating mechanism comprises a motor device (1), a control circuit board (05), a screw rod assembly, a transmission plate (2) and a mounting frame (10), wherein a handle perforation (04) is arranged at the opposite position of the middle cover (02) and the upper cover (03), a breaker handle (3) extends out of the handle perforation (04), and a first accommodating concave cavity (021) and a second accommodating concave cavity (022) which are concave downwards are formed in the upper part of the middle cover (02); the motor device (1) and the screw rod assembly are arranged on the mounting frame (10) to form an assembly, the assembly is arranged in the first accommodating cavity (021), and the control circuit board (05) is arranged in the second accommodating cavity (022); the control circuit board (05) is electrically connected with the motor device (1), the screw rod assembly comprises a screw rod (4) driven to rotate by the motor device (1) and a moving block (5) matched with the screw rod (4), one end of the transmission plate (2) is fixedly connected with the moving block (5), a handle sleeve hole (21) is formed in the other end of the transmission plate (2), the breaker handle (3) is located in the handle sleeve hole (21), and the motor device (1) drives the transmission plate (2) to do linear motion along the axial direction of the screw rod (4) when rotating; the control circuit board (05) is electrically connected with three switches, the three switches are arranged at intervals along the axis direction of the screw rod (4), the three switches are a closing position switch (6), a separating brake position switch (7) and an initial position switch (8), the initial position switch (8) is arranged between the closing position switch (6) and the separating brake position switch (7), a trigger part (9) suitable for triggering each switch is fixed on the transmission plate (2)/the moving block (5), when the trigger part (9) is positioned at a position for triggering the initial position switch (8), a gap is reserved between the hole wall of the handle sleeve hole (21) and the breaker handle (3) for manual switching of the breaker handle (3) between the closing position and the separating brake position so as to realize manual switching on-off; when the motor device (1) is controlled to rotate and drive the screw rod (4) to rotate by the control circuit board (05) during electric switching-on or switching-off, the transmission plate (2) and the triggering part (9) are driven to axially and synchronously move along the screw rod (4), when the triggering part (9) moves to trigger the switching-on position switch (6) or the switching-off position switch (7), the transmission plate (2) pushes the breaker handle (3) to a switching-on position or a switching-off position, the control circuit board (05) controls the motor device (1) to reversely rotate after the switching-on position switch (6) or the switching-off position switch (7) is triggered so as to drive the screw rod (4) to reversely rotate, and the transmission plate (2) and the triggering part (9) are driven to reversely move until the control circuit board (05) controls the motor device (1) to stop rotating when the triggering part (9) triggers the initial position switch (8); the upper part of the middle cover (02) is provided with a supporting table top (023) adjacent to the breaker handle (3), the two sides of the transmission plate (2) are provided with limiting parts (06) on the upper part of the middle cover (02), the limiting parts (06) are provided with limiting hook plates (061) in a shape of 7, the limiting hook plates (061) are matched with the supporting table top (023) to limit the transmission plate (2), and the mounting frame (10) is fixed in the first accommodating concave cavity (021) through fixing screws; the side wall of the first accommodating concave cavity (021) is provided with a limiting clamping groove (024), and the mounting frame (10) is provided with a clamping part (102) matched with the limiting clamping groove (024).

2. The mechanism embedded molded case circuit breaker according to claim 1, wherein the motor device (1) comprises a driving motor (11) and a reduction gear set (12), an input gear (13) of the reduction gear set (12) is fixed on a motor shaft of the driving motor (11), and an output gear (14) of the reduction gear set (12) is fixed at an end of the screw rod (4).

3. The mechanical built-in molded case circuit breaker according to claim 2, characterized in that the mounting frame (10) is further provided with a guiding structure for guiding the movement of the moving block (5).

4. A mechanism embedded molded case circuit breaker according to claim 3, characterized in that the guiding structure is a guiding rod (101) arranged on the mounting frame (10) and arranged in the same direction with the screw rod (4), and the moving block (5) is provided with a groove (51) matched with the guiding rod (101).