Plug-in circuit breaker

Abstract

When the switch is unlocked, the locking protrusion is pushed out of the locking hole and the locking protrusion is driven by the on / off button to close the switch.

Description

Technical Field

[0001] The invention belongs to the field of low-voltage terminal electrical appliances and relates to a plug-in circuit breaker. Background Art

[0002] With the rapid development of network communication technology, especially the widespread application of 5G networks, the demand for circuit breakers to effectively improve the safety of electrical equipment is becoming increasingly stringent. The traditional power supply method of connecting multiple sockets and power strips to a single terminal circuit breaker is far from meeting the requirements for safe power use and equipment protection. For example, the terminal circuit breakers used in 5G communication equipment are in urgent need of upgrading and improving performance in terms of miniaturization, intelligence, reliability, and stability. In addition, many new matching structures have been developed to meet the requirements of use. For example, the circuit breaker is required to have a socket that can be easily plugged in and out of the cabinet like a power plug and locked in place. This new type of circuit breaker is called a plug-in circuit breaker, but it is different from the traditional plug-in, plug-in, drawer-type, or universal circuit breaker. The use of new plug-in circuit breakers not only provides the various safety protection features of circuit breakers for power lines and electrical equipment, but also meets the power quality requirements of different electrical equipment. And the circuit breaker can be easily inserted and removed from the circuit by plugging. To this end, the structure of plug-in circuit breakers has now developed into various types. However, under the trend of miniaturization of electrical equipment, the overall structure and operation mode of the matching circuit breakers are still in urgent need of further improvement, optimization and upgrading.

[0003] While plug-in circuit breakers offer the obvious advantage of quick installation into a cabinet, quick-swap plugs pose a significant safety risk. For example, a circuit breaker can be mistakenly installed into a cabinet while closed. Furthermore, there are risks of closing a circuit breaker while it's not properly installed. Furthermore, there are risks of mistakenly removing a circuit breaker from a cabinet while closed, among other potential risks associated with live operations.

[0004] To prevent the risk of live operation, existing plug-in circuit breakers are usually equipped with corresponding locking mechanisms. However, the locking mechanism of the existing structure is relatively complex, and usually requires the provision of corresponding locking parts, unlocking parts, and transmission parts. It involves many parts, occupies more space, and the transmission coordination is also relatively complex.

[0005] In addition, the locking mechanism of the plug-in circuit breaker in the prior art can only provide a locking mechanism to prevent certain safety hazards. For example, it can only prevent the circuit breaker from being inserted into the cabinet in the closed state, but cannot prevent the circuit breaker from being removed from the cabinet in the closed state. Other existing solutions can only prevent the circuit breaker from being removed from the cabinet in the closed state, but cannot prevent the circuit breaker from being inserted into the cabinet in the closed state. There is also a type of existing technology solution that can block the circuit breaker outside the cabinet in the closed state. However, when the circuit breaker in the open state is installed in the cabinet, this type of existing technology cannot prevent the circuit breaker from being accidentally closed before it is fully installed. Therefore, it is impossible to use a set of locking devices to prevent multiple closing insertions of the circuit breaker (preventing closing before insertion into the cabinet and preventing closing during insertion into the cabinet).

[0006] To enable existing plug-in circuit breakers with pluggable connectors to provide multiple protection functions, existing technologies often require the installation of multiple independent locking devices in parallel within the circuit breaker to prevent the circuit breaker from being mistakenly inserted or removed from the cabinet while the circuit breaker is closed. For example, a single circuit breaker requires a separate locking device to prevent the circuit breaker from being removed from the cabinet, and another separate locking device to prevent the circuit breaker from being inserted into the cabinet. Sometimes, the circuit breaker even needs to have two independent locking devices: a locking device to prevent the circuit breaker from closing before insertion and a locking device to prevent the circuit breaker from closing during insertion. The coexistence of multiple locking mechanisms multiplies the number of locking device components, and damage to any one of them will render the device obsolete. Multiple locking mechanisms require separate installation spaces, preventing further miniaturization of the circuit breaker. Each locking mechanism has independent triggering relationships with other systems, and each locking device also has independent internal movement. The independent locking devices must be installed in a way that avoids gaps between each other, resulting in a complex structure and cumbersome functional implementation. When these independent locking devices are installed in parallel, multiple locking protrusions may extend through the circuit breaker window, making it easy to operate incorrectly, increasing safety risks and poor user experience. Summary of the Invention

[0007] The object of the present invention is to provide a plug-in circuit breaker that is simple in structure and safe and reliable.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A plug-in circuit breaker comprises a circuit breaker housing provided with a limiting hole, an opening and closing button, and a locking piece, wherein the locking piece is rotatably mounted in the circuit breaker housing, the upper portion of the locking piece near the limiting hole is provided with a locking protrusion that cooperates with the limiting hole, and the lower portion of the locking piece is provided with a locking drive surface that cooperates with the opening and closing button; when the opening and closing button is pressed, the opening and closing button pushes the locking drive surface of the locking piece, driving the locking protrusion of the locking piece to rotate toward the limiting hole of the circuit breaker housing; when the limiting hole is not blocked, the opening and closing button pushes the locking drive surface so that the locking protrusion extends from the limiting hole and the plug-in circuit breaker is closed; when the limiting hole is blocked so that the locking protrusion cannot extend from the limiting hole, the locking drive surface limits the opening and closing button so that the opening and closing button cannot be pressed into place, and the plug-in circuit breaker cannot be closed.

[0010] Preferably, the plug-in circuit breaker is opened by pulling the opening and closing button, and simultaneously the locking piece is rotated to retract the locking protrusion into the circuit breaker housing.

[0011] Preferably, a driving protrusion that cooperates with the locking driving surface is provided on one side of one end of the opening and closing button close to the locking piece.

[0012] Preferably, an actuated boss is further provided at the lower portion of the locking member away from one end of the limiting hole, and one side of the actuated boss is connected to the locking drive surface. When the opening and closing button is pulled to convert the plug-in circuit breaker from a closed state to an open state, the driving boss of the opening and closing button pulls the actuated boss to rotate the opening and closing button, and the locking boss rotates and retracts into the circuit breaker housing.

[0013] Preferably, the end of the opening and closing button extending into the circuit breaker is the driving end, and a button limiting groove is provided on the side of the driving end of the opening and closing button close to the locking piece, and the driving protrusion is located on the side of the button limiting groove close to the locking protrusion. When the plug-in circuit breaker is in the closed state, the actuated boss of the locking piece is tilted and pressed against the side of the button limiting groove away from the locking protrusion.

[0014] Preferably, the locking protrusion is a square boss.

[0015] Preferably, when the plug-in circuit breaker is in a closed state, the driving protrusion is located directly below the locking protrusion and the limiting hole.

[0016] Preferably, an acute angle is formed between the driven boss and the locking drive surface.

[0017] Preferably, when the plug-in circuit breaker is in the closed state, an angle α is formed between the locking drive surface and the moving direction of the opening and closing button, and the angle α is less than degrees.

[0018] Preferably, the circuit breaker housing is provided with an operating mechanism connected to the opening and closing button drive, a moving contact connected to the operating mechanism, a static contact used in conjunction with the moving contact, an arc extinguishing device, an overload protection device, a short-circuit protection device, an outlet terminal, and an incoming terminal. The opening and closing button and the outlet terminal are arranged at one end of the circuit breaker housing, and the incoming terminal is arranged at the other end of the circuit breaker housing. A limit hole and a locking piece are provided on the upper side of the circuit breaker housing, and are rotatably installed between the opening and closing button and the limit hole.

[0019] Preferably, the operating mechanism is arranged on one side of the opening and closing button, the operating mechanism and the overload protection device are arranged side by side on one side of the opening and closing button and the outgoing line end, the short-circuit protection device is located between the operating mechanism and the incoming line end, and the short-circuit protection device and the arc extinguishing device are arranged side by side on one side of the operating mechanism and the overload protection device.

[0020] Preferably, a rotation center is provided in the middle of the locking piece, and the rotation center is set toward one end away from the locking protrusion. A driven boss is also provided at the lower part of the locking piece away from the limiting hole. One side of the driven boss is connected to the locking drive surface. A driving boss is provided on the side of the opening and closing button close to the locking piece, and the driving boss and the locking drive surface are always in continuous sliding engagement.

[0021] The locking device of the plug-in circuit breaker of the present invention realizes multiple locking functions through the cooperation of a locking member and an opening and closing button, including: 1. When the circuit breaker is closed outside the cabinet, it cannot be installed in the working position, thereby avoiding the risk of live operation; 2. When the plug-in circuit breaker is not installed in the working position during the installation process of the cabinet, it cannot complete the closing action, thereby avoiding the risk of live operation; 3. When the plug-in circuit breaker is installed in the correct working position of the cabinet, the opening and closing button can normally open and close the circuit breaker, but in the closed state, the locking device can lock the plug-in circuit breaker in the working position to prevent it from being easily pulled out, thereby avoiding live plugging and unplugging operations. The plug-in circuit breaker greatly improves the safety of use, has a very simple structure and is low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the circuit breaker locking piece and the opening and closing buttons of the present invention.

[0023] Figure 2 This is a schematic diagram showing the position status of the locking piece and the opening and closing buttons when the circuit breaker is not correctly installed in the working position.

[0024] Figure 3 This is a schematic diagram of the position of the locking parts and the opening and closing buttons when the circuit breaker is correctly installed in the cabinet and closed.

[0025] Figure 4 This is a schematic diagram showing the position status of the locking piece and the opening and closing buttons when the circuit breaker is closed outside the cabinet.

[0026] Figure 5 This is a diagram of the coordinated state of the locking piece and the opening and closing button when the opening and closing button is pulled to open the circuit breaker. The opening and closing button retracts the locking protrusion of the locking piece into the circuit breaker housing.

[0027] Figure 6 It is a schematic diagram of the overall structure of the circuit breaker.

[0028] Figure 7 This is a schematic diagram of the position of the locking parts and the opening and closing buttons when the circuit breaker is correctly installed in the cabinet and closed.

[0029] Figure 8 yes Figure 7 A partial enlarged view of . DETAILED DESCRIPTION

[0030] The following embodiments are provided in conjunction with the accompanying drawings to further illustrate the specific implementation of the present invention. The plug-in circuit breaker with an anti-closing plug-in locking device created by the present invention is not limited to the description of the following embodiments.

[0031] like Figure 6 As shown, an embodiment of a plug-in circuit breaker includes a circuit breaker housing 3, on which is provided an opening and closing button 1 for driving the circuit breaker to open and close. Within the circuit breaker housing 3 are provided an operating mechanism 5 connected to the opening and closing button 1, a movable contact connected to the operating mechanism, a static contact used in conjunction with the movable contact, an arc extinguishing device 8, an outlet terminal 4, and an inlet terminal 9. The opening and closing button 1 and the outlet terminal 4 are arranged at one end of the circuit breaker housing 3, and the inlet terminal 9 is arranged at the other end of the circuit breaker housing 3. When the opening and closing button 1 is pressed, the opening and closing button 1 drives the movable contact to contact the static contact through the operating mechanism 5 to close the circuit breaker. When the opening and closing button 1 is pulled, the opening and closing button 1 drives the operating mechanism 5 to separate the movable contact from the static contact to open the circuit breaker. An overload protection device 6 is also provided within the circuit breaker housing 3. When an overload occurs, the bimetallic strip of the overload protection mechanism bends, causing the operating mechanism to trip. A short-circuit protection device 7 and / or a leakage protection mechanism may also be provided to trigger the operating mechanism to trip in the event of a short circuit or leakage. The line inlet terminal 9 is a socket-type terminal. When the plug-in circuit breaker is inserted into the cavity-shaped installation position 900 of the cabinet, it is connected to the pin-type conductor in the installation position 900.

[0032] The plug-in circuit breaker is also provided with a locking device. A limiting hole 31 that cooperates with the locking device is provided on the circuit breaker housing 3 of the plug-in circuit breaker. A cabinet limiting hole 901 corresponding to the limiting hole 31 of the plug-in circuit breaker is provided on the installation position 900 of the cabinet. When the plug-in circuit breaker is installed to the working position, the limiting hole 31 of the plug-in circuit breaker corresponds to the limiting hole 901 of the cabinet. When the plug-in circuit breaker is not installed to the working position, the limiting hole 31 of the plug-in circuit breaker is misaligned with the limiting hole 901 of the cabinet. This is the existing technology in the field and will not be repeated here.

[0033] like Figure 1-3 As shown, the plug-in circuit breaker of the present invention includes a circuit breaker housing 3 with a limit hole 31, an opening and closing button 1, and a locking device. One of the main improvements is that the locking device includes a locking member 2 installed inside the plug-in circuit breaker, and the locking member 2 is rotatably installed in the circuit breaker housing 3. The upper portion of the locking member 2 is provided with a locking protrusion 22 that cooperates with the limit hole 31, and the lower portion of the locking member 2 is provided with a locking drive surface 23 that cooperates with the opening and closing button 1; when the opening and closing button 1 is pressed, the opening and closing button 1 pushes the locking member 2. The locking drive surface 23 drives the locking protrusion 22 of the locking member 2 to rotate toward the limiting hole 31 of the circuit breaker housing 3. When the limiting hole 31 is not blocked, the locking protrusion 22 can extend from the limiting hole 31, and the opening and closing button 1 pushes up the locking drive surface 23 to make the locking protrusion extend from the limiting hole 31 and close the plug-in circuit breaker. When the limiting hole 31 is blocked and the locking protrusion 22 cannot extend from the limiting hole 31, the locking drive surface 23 limits the opening and closing button 1 so that the opening and closing button 1 cannot be pressed into place, and the plug-in circuit breaker cannot be closed.

[0034] like Figure 3 As shown, the plug-in circuit breaker has been installed to the working position, and the limiting hole 31 of the plug-in circuit breaker corresponds to the limiting hole 901 of the cabinet. At this time, the opening and closing button 1 is pressed, and the opening and closing button 1 slides with the locking drive surface 23, pushes the locking drive surface 23 of the locking member 2, and drives the locking protrusion 22 of the locking member 2 to rotate toward the limiting hole 31 of the circuit breaker housing 3. The locking protrusion 22 can extend from the limiting hole 31 and the limiting hole 901 of the cabinet, and the opening and closing button 1 pushes the locking drive surface 23. The opening and closing button 1 can continue to be pressed to the closing position to close the plug-in circuit breaker. After the circuit breaker is closed, the locking protrusion 22 is limited and clamped by the limiting hole 901 of the cabinet, so that the plug-in circuit breaker cannot be pulled out from the installation position of the cabinet when it is correctly installed in the cabinet and in the closed state, thereby avoiding live plugging and unplugging operations.

[0035] like Figure 2As shown, the plug-in circuit breaker is not installed to the working position, the limiting hole 31 of the plug-in circuit breaker is misaligned with the limiting hole 901 of the cabinet, and the limiting hole 31 of the plug-in circuit breaker is blocked by the cabinet sheet metal of the cabinet installation position 900. The locking boss 22 of the locking member 2 is restricted by the cabinet and cannot rotate from the limiting hole 31 to the outside of the circuit breaker. At this time, the opening and closing button 1 is pressed. Since the locking protrusion 22 is limited by the cabinet sheet metal, the opening and closing button 1 cannot completely lift the locking drive surface 23. The locking drive surface 23 is tilted to the direction of movement of the opening and closing button 1. The opening and closing button 1 is limited so that the opening and closing button 1 cannot move into the inside of the circuit breaker and cannot be pressed into place, so that the plug-in circuit breaker cannot be closed during the installation process of the cabinet installation position, avoiding live operation.

[0036] like Figure 4 As shown, the plug-in circuit breaker is closed outside the cabinet. The opening and closing button 1 is pressed, and the opening and closing button 1 moves toward the inside of the circuit breaker. The opening and closing button 1 pushes the locking drive surface 23 of the locking member 2, driving the locking protrusion 22 of the locking member 2 to rotate toward the limiting hole 31 of the circuit breaker housing 3. Since the limiting hole 31 is not blocked, the opening and closing button 1 pushes the locking drive surface 23, so that the locking protrusion 22 extends from the limiting hole 31 and is exposed outside the circuit breaker. The opening and closing button 1 can continue to be pressed to the closing position to close the plug-in circuit breaker. At this time, the locking protrusion 22 extends from the limiting hole 31, which is higher than the height of the cabinet mounting position 900. The locking protrusion 22 conflicts with the sheet metal of the cabinet mounting position 900, making it impossible for the plug-in circuit breaker to be inserted into the working position of the cabinet mounting position, avoiding live plugging and unplugging operations.

[0037] The locking device of the plug-in circuit breaker of the present invention realizes multiple locking functions through the cooperation of a locking member 2 and an opening and closing button 1, including: 1. When the circuit breaker is closed outside the cabinet, it cannot be installed in the working position, thereby avoiding the risk of live operation; 2. When the plug-in circuit breaker is not installed in the working position during the installation process of the cabinet, it cannot complete the closing action, thereby avoiding the risk of live operation; 3. When the plug-in circuit breaker is installed in the correct working position of the cabinet, the opening and closing button 1 can normally open and close the circuit breaker, but in the closed state, the locking device can lock the plug-in circuit breaker in the working position and prevent it from being easily pulled out, thereby avoiding live plugging and unplugging operations. The plug-in circuit breaker greatly improves the safety of use, has a very simple structure and is low in cost.

[0038] like Figure 1As shown, a preferred embodiment of the locking device of a plug-in circuit breaker of the present invention comprises: a rotation center 24 provided on the locking member 2; a limiting hole 31 provided on the circuit breaker housing 3; a locking protrusion 22 corresponding to the limiting hole 31 is provided on an upper portion of the locking member 2 at one end away from the rotation center and near the limiting hole 31; and a locking drive surface 23 cooperating with the opening and closing button 1 is provided on a lower portion of the locking member 2 away from the limiting hole 31. The locking member 2 can rotate to one side about the rotation center 24 to extend the locking protrusion 22 out of the limiting hole 31, or rotate to the other side about the rotation center 24 to retract the locking protrusion 22 into the circuit breaker housing 3.

[0039] Press the opening and closing button 1, the opening and closing button 1 pushes the locking drive surface 23 of the locking member 2, the opening and closing button 1 and the locking drive surface 23 always continue to slide and cooperate, driving the locking protrusion 22 of the locking member 2 to rotate toward the limiting hole 31 of the circuit breaker housing 3. When the locking protrusion 22 can extend from the limiting hole 31, the opening and closing button 1 pushes the locking drive surface 23 and closes the plug-in circuit breaker. After the circuit breaker is closed, the opening and closing button 1 limits the locking member 2, so that the locking member 2 cannot It can rotate in the opposite direction, and adopts the opening and closing button 1 to the locking member 2, without using an elastic member. Even if the locking protrusion 22 is pressed by external force at this time, the locking protrusion 22 will not be retracted into the circuit breaker housing 3, saving components and improving safety; when the limiting hole 31 is blocked so that the locking protrusion 22 cannot extend from the limiting hole 31, the locking drive surface 23 is inclined to the moving direction of the opening and closing button 1, limiting the opening and closing button 1 so that the opening and closing button 1 cannot be pressed into place, and the plug-in circuit breaker cannot be closed.

[0040] Preferably, the locking protrusion 22 is a square boss. When the locking protrusion 22 extends from the limiting hole 31, the two sides of the square boss are parallel to the two side walls of the limiting hole 31. This effectively prevents the plug-in circuit breaker from being inserted into the installation position when the circuit breaker is closed outside the cabinet, and prevents the plug-in circuit breaker from being removed from the cabinet after being installed in the working position of the cabinet and in the closed state. Of course, the locking protrusion 22 is not limited to a square boss and can also be a protrusion with rounded corners, a T-shaped protrusion, or other structures.

[0041] Preferably, the locking drive surface 23 is a plane, so that the opening and closing button 1 can move smoothly when slidingly cooperating with the locking drive surface 23. Of course, the locking drive surface 23 can also be an arcuate surface, or have some grooves or protrusions.

[0042] The opening and closing button 1 is slidably engaged with the locking drive surface 23 through its end foot. Preferably, a driving protrusion 12 that cooperates with the locking drive surface 23 is provided on one side of the opening and closing button 1 close to the locking member 2, and the locking drive surface 23 is lifted up by the driving protrusion 12 when the switch is closed. Preferably, when the opening and closing button 1 is pressed to close the switch, when the plug-in circuit breaker is in the closed state, the driving protrusion 12 is located directly below the locking protrusion 22 and the limiting hole 31, playing a better supporting and limiting role. Of course, the driving protrusion 12 may not be provided at one end of the opening and closing button 1, and the right-angled side of one end of the opening and closing button 1 may directly slide with the locking drive surface 23, or a rounded corner may be provided on the right-angled side of one end for cooperation.

[0043] Preferably, the plug-in circuit breaker is opened by pulling the opening and closing button 1, and the locking member 2 is rotated to retract the locking protrusion 22 into the circuit breaker housing. Figure 1 、 5 As shown, a preferred embodiment of the locking member 2 is provided with a rotation center 24 in the middle of the locking member 2, and the rotation center 24 is set toward one end away from the locking protrusion 22. A locking protrusion 22 corresponding to the limiting hole 31 is provided at the upper part of one end of the locking member 2 near the limiting hole 31, and a locking drive surface 23 cooperating with the opening and closing button 1 is provided at the lower part of the locking member 2 away from the limiting hole 31. A driven boss 21 is also provided at the lower part of the end of the locking member 2 away from the limiting hole 31, and one side of the driven boss 21 is connected to the locking drive surface 23. A driving boss 12 is provided on one side of the opening and closing button 1 near the locking member 2. When the opening and closing button 1 is pressed, the opening and closing button 1 cooperates with the locking drive surface 23 through the driving boss 12, lifts the opening and closing button 1, and makes the locking protrusion 22 extend out of the limiting hole 31, and closes the circuit breaker. When the plug-in circuit breaker has been installed in the working position and is in the closed state, the circuit breaker can be switched from the closed state to the open state by pulling the opening and closing button 1. Figure 5 As shown, when the opening and closing button 1 is pulled, the opening and closing button 1 first slides with the locking drive surface 23 through the driving protrusion 12, and then the plug-in circuit breaker is opened. The driving protrusion 12 moves to mate with the actuated boss 21 of the locking member 2. Pulling the actuated boss 21 causes the opening and closing button 1 to rotate clockwise, and the locking protrusion 22 rotates and retracts into the circuit breaker housing 3, allowing the plug-in circuit breaker to be removed from the working position when in the open state. During the process of the opening and closing button 1 driving the circuit breaker to close and open, the opening and closing button 1 and the locking drive surface 23 are always in contact and sliding engagement.

[0044] More preferably, Figure 1 、 3As shown in Figure 5, the end of the opening and closing button 1 extending into the circuit breaker is the driving end 11. A button limiting groove 13 is provided on the side of the driving end 11 of the opening and closing button 1 close to the locking member 2. The driving protrusion 12 is located on the side of the button limiting groove 13 close to the locking protrusion 22. The driven boss 21 moves in the area of ​​the button limiting groove 13. Figure 3 As shown, when the opening and closing button 1 is pressed to close the circuit breaker, the driving protrusion 12 of the opening and closing button 1 is located directly below the locking protrusion 22 and the limiting hole 31, and the driven boss 21 of the locking member 2 is tilted against the side of the button limiting groove 13 away from the locking protrusion 22, restricting the locking member 2 from rotating clockwise and retracting into the circuit breaker housing 3. Figure 5 As shown, when the opening and closing button 1 is pulled out to place the circuit breaker in the open state, the actuated boss 21 of the locking member 2 cooperates with the driving boss 12 on the side of the button limiting groove 13 near the locking boss 22, pulling the locking member 2 clockwise to retract the locking boss 22 into the circuit breaker housing 3. The cooperation of the driving boss 12, the button limiting groove 13, the actuated boss 21, and the locking drive surface 23 not only achieves unlocking of the plug-in circuit breaker in the open state, allowing the circuit breaker to be pulled out of the cabinet, but also the button limiting groove 13 and the actuated boss 21 also serve as a limit in the closed state, preventing the opening and closing button 1 from rotating in the opposite direction. They also limit the rotation range of the locking member 2, greatly improving the reliability of the locking device. In addition, the structure is particularly simple and does not require any other components to cooperate.

[0045] In addition, as a modified embodiment of the present invention, in order to achieve unlocking by pulling the circuit breaker out of the cabinet in the open state, it is obviously also possible not to provide the passive boss 21 and / or the driving boss 12. For example, one solution is that after the circuit breaker is opened by pulling out the opening and closing button 1, the pulling out of the opening and closing button 1 no longer limits the locking member 2. The locking member 2 is provided with a locking boss 22, one end of which is heavier than the other end. The locking boss 2 rotates and retracts into the circuit breaker housing under the action of gravity. Preferably, the locking member 2 is an eccentric structure, and the rotation center 24 of the locking member 2 is set away from one end of the locking boss 2. For example, another solution is that an elastic member connected to the locking member 2 is provided to drive the locking member 2 to rotate in the direction of retracting the locking boss 2 into the circuit breaker housing. The elastic member can be a torsion spring or a compression spring. However, this solution not only increases the number of parts, but also increases the force when pressing the opening and closing button 1.

[0046] Specifically, such as Figure 1As shown, a preferred embodiment of the locking member 2 of the present invention is shown, in which the middle portion of the locking member 2 is rotatably mounted in the circuit breaker housing 3, a locking protrusion 22 is provided on the upper portion of one end near the limiting hole 31, and a locking drive surface 23 that cooperates with the opening and closing button 1 is provided on the lower portion away from the limiting hole 31. The lower portion of the other end of the locking member 2 is also provided with an actuated boss 21, one side of the actuated boss 21 is connected to the locking drive surface 23, and an acute angle is formed between the actuated boss 21 and the locking drive surface 23.

[0047] More preferably, Figure 7-8 As shown, when the opening and closing button 1 is pressed to fully close the circuit breaker, the plug-in circuit breaker is in the closed state. The locking drive surface 23 forms an angle α with the moving direction of the opening and closing button 1, that is, with the horizontal direction. The angle α is less than 15 degrees. At the same time, the driving protrusion 12 can be located directly below the locking protrusion 22 and the limiting hole 31, and the two side edges of the square boss are parallel to the two side walls of the limiting hole 31.

[0048] like Figure 6 As shown, a preferred embodiment of the plug-in circuit breaker of the present invention includes a circuit breaker housing 3, a switch-on / off button 1 is provided on the circuit breaker housing 3, an operating mechanism 5 connected to the switch-on / off button 1, a moving contact connected to the operating mechanism 5, a static contact used in conjunction with the moving contact, an arc extinguishing device 8, an overload protection device 6, a short-circuit protection device 7, an outlet terminal 4, an inlet terminal 9 and a locking device of the present invention are provided in the circuit breaker housing 3, the switch-on / off button 1 and the outlet terminal 4 are provided at one end of the circuit breaker housing 3, the inlet terminal 9 is provided at the other end of the circuit breaker housing 3, the front panel of the plug-in circuit breaker is located on the left, the switch-on / off button 1 is installed on the front panel, and the plug-in circuit breaker is inserted along the circuit breaker installation direction F (as shown in FIG. Figure 7 The circuit breaker is inserted between the two cabinet sheet metals 4 of the cabinet (as shown to the right) and can be pulled out of the cabinet in the opposite direction of the circuit breaker insertion installation direction F; a limit hole 31 is provided on the upper side of the circuit breaker housing 3, and the locking device includes a locking member 2, which is rotatably installed between the opening and closing button 1 and the limit hole 31. The operating mechanism 5 is arranged on one side of the opening and closing button 1, and the operating mechanism 5 and the overload protection device 6 are arranged side by side on the side of the opening and closing button 1 and the outlet terminal 4. The short-circuit protection device 7 is located between the operating mechanism 5 and the incoming terminal 9, and the short-circuit protection device 7 and the arc extinguishing device 8 are arranged side by side on one side of the operating mechanism 5 and the overload protection device 6. Specifically, according to Figure 6In the direction shown, the opening and closing button 1 is arranged on the left side of the circuit breaker, the limiting hole 31 is located on the upper side wall of the circuit breaker housing 3, the locking member 2 is located on the upper right side of the button, and between the opening and closing button 1 and the limiting hole 31, the outgoing terminal 4 is arranged below the opening and closing button 1 and on the left side of the circuit breaker, the incoming terminal 9 is arranged on the right side of the circuit breaker, the operating mechanism 5 is arranged on the right side of the opening and closing button 1, the overload protection device 6 is arranged below the operating mechanism 5 and on the right side of the outgoing terminal 4, the short-circuit protection device 7 is arranged on the right side of the operating mechanism 5 and on the left side of the incoming terminal 9, and the arc extinguishing device 8 is arranged below the short-circuit protection device 7, on the right side of the overload protection device 6, and on the left side of the incoming terminal 9.

[0049] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A plug-in circuit breaker, comprising a circuit breaker housing (3) provided with a limiting hole (31), and a switch-on / off button (1), characterized in that: It also includes a locking member (2), which is rotatably mounted in the circuit breaker housing (3), and a locking protrusion (22) that cooperates with the limiting hole (31) is provided on the upper part of the locking member (2) near the limiting hole (31), and a locking driving surface (23) that cooperates with the opening and closing button (1) is provided on the lower part of the locking member (2); When the opening and closing button (1) is pressed, the opening and closing button (1) pushes the locking drive surface (23) of the locking member (2), driving the locking protrusion (22) of the locking member (2) to rotate toward the limiting hole (31) of the circuit breaker housing (3); when the limiting hole (31) is not blocked, the opening and closing button (1) pushes the locking drive surface (23) so that the locking protrusion extends from the limiting hole (31), and the plug-in circuit breaker is closed; when the limiting hole (31) is blocked so that the locking protrusion (22) cannot extend from the limiting hole (31), the locking drive surface (23) limits the opening and closing button (1) so that the opening and closing button (1) cannot be pressed into place, and the plug-in circuit breaker cannot be closed.

2. The plug-in circuit breaker according to claim 1, characterized in that: Pulling the opening and closing button (1) opens the plug-in circuit breaker, and simultaneously the locking piece (2) rotates to retract the locking protrusion (22) into the circuit breaker housing.

3. The plug-in circuit breaker according to claim 1, characterized in that: A driving protrusion (12) that cooperates with a locking driving surface (23) is provided on one side of one end of the opening and closing button (1) close to the locking piece (2).

4. The plug-in circuit breaker according to claim 3, characterized in that: The lower portion of the locking member (2) away from the limiting hole (31) is further provided with an actuated boss (21), one side of which is connected to the locking drive surface (23). When the opening / closing button (1) is pulled to switch the plug-in circuit breaker from a closed state to an open state, the driving boss (12) of the opening / closing button (1) pulls the actuated boss (21) to rotate the opening / closing button (1), and the locking boss (22) rotates and retracts into the circuit breaker housing (3).

5. The plug-in circuit breaker according to claim 4, characterized in that: The end of the opening and closing button (1) extending into the circuit breaker is a driving end (11), and a button limiting groove (13) is provided on the side of the driving end (11) of the opening and closing button (1) close to the locking member (2). The driving protrusion (12) is located on the side of the button limiting groove (13) close to the locking protrusion (22). When the plug-in circuit breaker is in the closed state, the driven protrusion (21) of the locking member (2) is tilted and pressed against the side of the button limiting groove (13) away from the locking protrusion (22).

6. The plug-in circuit breaker according to claim 1, characterized in that: The locking protrusion (22) is a square boss.

7. The plug-in circuit breaker according to claim 3, characterized in that: When the plug-in circuit breaker is in a closed state, the driving protrusion (12) is located directly below the locking protrusion (22) and the limiting hole (31).

8. The plug-in circuit breaker according to claim 4, characterized in that: An acute angle is formed between the driven boss (21) and the locking drive surface (23).

9. The plug-in circuit breaker according to claim 1, characterized in that: When the plug-in circuit breaker is in a closed state, an included angle α is formed between the locking drive surface (23) and the moving direction of the opening and closing button (1), and the included angle α is less than (15) degrees.

10. The plug-in circuit breaker according to claim 1, characterized in that: The circuit breaker housing (3) is provided with an operating mechanism (5) connected to the opening and closing button (1), a moving contact connected to the operating mechanism (5), a static contact used in conjunction with the moving contact, an arc extinguishing device (8), an overload protection device (6), a short circuit protection device (7), an outlet terminal (4), and an inlet terminal (9); the opening and closing button (1) and the outlet terminal (4) are arranged at one end of the circuit breaker housing (3), and the inlet terminal (9) is arranged at the other end of the circuit breaker housing (3); a limiting hole (31) is provided on the upper side of the circuit breaker housing (3); and a locking member (2) is rotatably mounted between the opening and closing button (1) and the limiting hole (31).

11. The plug-in circuit breaker according to claim 10, characterized in that: The operating mechanism (5) is arranged on one side of the opening and closing button (1); the operating mechanism (5) and the overload protection device (6) are arranged side by side on one side of the opening and closing button (1) and the outgoing terminal (4); the short-circuit protection device (7) is located between the operating mechanism (5) and the incoming terminal (9); the short-circuit protection device (7) and the arc extinguishing device (8) are arranged side by side on one side of the operating mechanism (5) and the overload protection device (6).

12. The plug-in circuit breaker according to claim 1, characterized in that: The locking member (2) is provided with a rotation center (24) in the middle thereof, and the rotation center (24) is arranged toward one end away from the locking protrusion (22). The lower portion of the locking member (2) away from the limiting hole (31) is also provided with an actuated boss (21), one side of the actuated boss (21) is connected to the locking drive surface (23), and a driving boss (12) is provided on one side of the opening and closing button (1) close to the locking member (2), and the driving boss (12) and the locking drive surface (23) are always in continuous sliding engagement.

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