A locking and unlocking device for a circuit breaker

Abstract

The present invention discloses a locking and unlocking device for a circuit breaker, which relates to the field of low-voltage electrical appliances, and comprises a housing, a handle, a limiting member and a sliding block, wherein the handle is rotatably mounted in the housing, the sliding block is linearly slidably mounted in the housing and is located in front of the handle, the handle is linked to the sliding block, the limiting member is rotatably mounted in the housing and is located in front of the sliding block, the limiting member has a first position exposed outside the housing and staggered with the movement trajectory of the sliding block, and a second position retracted into the housing to block in front of the sliding block and prevent the handle from closing, and when the circuit breaker is in a closed state and the limiting member is in the first position, the sliding block is located below the limiting member and within its rotation trajectory. The present invention has the advantages of good safety and reliable operation.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a locking and unlocking device for a circuit breaker. Background Art

[0002] As a switch that can provide various protection functions, circuit breakers can effectively improve the safety and reliability of electrical equipment and power lines. In order to meet the increasingly diverse needs of users, the diversification and miniaturization of circuit breakers is a trend.

[0003] The existing circuit breaker can be directly wired when it is in the closed state but not installed in place, which is not conducive to the reliable and stable operation of the circuit breaker and also poses a safety hazard.

[0004] After the existing circuit breaker is installed in place and powered on, there is a risk of being accidentally pulled out, which is not conducive to the reliable operation of the circuit breaker and electrical equipment, and also poses a safety hazard. Summary of the invention

[0005] In order to overcome the shortcomings of the background technology, the present invention provides a locking and unlocking device for a circuit breaker with good safety and reliable operation.

[0006] The technical solution adopted by the present invention is: a locking and unlocking device for a circuit breaker, which includes a shell, a handle, a limiting member and a sliding block, the handle can be rotatably installed in the shell, the sliding block can be linearly slidably installed in the shell and is located in front of the handle, the handle is linked to the sliding block, the limiting member can be rotatably installed in the shell and is located in front of the sliding block, the limiting member has a first position exposed outside the shell and staggered with the movement trajectory of the sliding block and a second position retracted into the shell to block in front of the sliding block and prevent the handle from closing, when the circuit breaker is in the closed state and the limiting member is in the first position, the sliding block is located below the limiting member and within its rotation trajectory.

[0007] It also includes an unlocking buckle that can be linearly slidably installed in the shell, the unlocking buckle is located above the sliding block, and an extrusion boss is provided at the front end of the unlocking buckle. The extrusion boss can be inserted into the gap between the limiting member and the shell and rotate the limiting member to the second position.

[0008] A first opening is provided on the upper surface of the shell, a pressure boss is provided on the upper surface of the limiting member which can pass through the first opening, the front end of the limiting member is hingedly installed in the shell, the rear end of the limiting member is provided with a limiting boss, the limiting boss is provided with a stop surface 1 facing the sliding block, and the front end of the sliding block is provided with a stop surface 2 corresponding to the stop surface 1.

[0009] The handle is provided with an operating rod extending in a radial direction, a mounting hole 1 is provided in the circumference of the handle, a mounting hole 2 is provided on the sliding block, and a connecting rod is provided between the mounting hole 1 and the mounting hole 2 to hinge and connect the two.

[0010] It also includes an elastic member, a mounting shaft for installing the elastic member is provided at the front end of the unlocking buckle, one end of the elastic member is installed on the unlocking buckle, and the other end is installed on the limiting member, and a baffle is provided on the side of the limiting member to prevent the other end of the elastic member from detaching.

[0011] The shell is provided with a second opening, and the unlocking buckle includes a straight portion, an elastic portion and a pushing portion passing through the second opening, the pushing portion is located at the end of the unlocking buckle, the straight portion is connected to the end position of the elastic portion and the front end positions are independent of each other, the extrusion boss is located at the front end of the straight portion, the elastic portion gradually tilts downward along the length direction and a downward extending card platform 1 is provided at its front end, and the shell is provided with a card platform 2 in front of the elastic portion in the movement direction and forms a card platform with the card platform 1 to form a card position.

[0012] A third card platform corresponding to the first card platform is provided on the upper surface of the sliding block. The third card platform and the first card platform are matched with each other by inclined sliding. The third card platform moves linearly with the sliding block and can push the first card platform to separate from the second card platform.

[0013] The second card platform is provided with an inclined surface section and a flat surface section in sequence from the back to the front, and when the pushing part moves forward to the inner wall in front of the second opening, the first card platform just passes over the second card platform and forms a card position fit;

[0014] When the pushing portion moves backward to the inner wall behind the second opening, the extrusion boss is subjected to the combined force of the backward thrust of the limiting member and the pre-tightening force of the elastic member, and the card platform 1 slides backward on the plane section. After the card platform 1 enters the inclined section, it slides down from the inclined section to the bottom under the combined force of its own elastic force and the pre-tightening force of the elastic member until the unlocking buckle is returned to the initial position.

[0015] The extrusion boss is in an acute angle shape, and a slope is provided on the upper surface of the limiting boss, and a gap is formed between the slope and the inner wall of the shell for the extrusion boss to be inserted.

[0016] The beneficial effects of the present invention are as follows: the technical solution ensures reliable assembly and stable operation of the small circuit breaker by means of the locking and unlocking device and the cabinet limit of the circuit breaker, and prevents the circuit breaker from being pulled out after being assembled in place; when the circuit breaker is in the closed state, the limiting member cooperates with the sliding block to prevent the limiting member from being retracted into the shell, and the circuit breaker cannot be inserted into the cabinet, which prevents the circuit breaker from being installed in place, and is conducive to further improving the reliable assembly and stable operation of the small circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a locking and unlocking device for a circuit breaker according to an embodiment of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of the locking and unlocking device of the circuit breaker when it is in the open state.

[0019] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0020] Figure 4 It is a schematic diagram of the structure when the gate is in the open state and the unlocking buckle is pushed.

[0021] Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0022] Figure 6 It is a structural diagram of pushing the unlocking buckle and pushing the handle to close the switch when the switch is in the open state.

[0023] Figure 7 for Figure 6 A partial enlarged view of point C in the middle.

[0024] Figure 8 It is a schematic diagram of the structure in which the limiting member is pressed down when the gate is in the open state.

[0025] Fig. 9 It is a schematic diagram of the structure when the switch is closed.

[0026] Fig.10 It is a schematic diagram of the structure after the limiting member is pressed down and the sliding block and unlocking buckle are removed when the gate is in the open state.

[0027] Fig.11 for Fig.10 A partial enlarged view of point D in the middle.

[0028] Fig.12 A schematic diagram of the structure of the handle.

[0029] Fig.13 It is a schematic diagram of the structure of the limiting part.

[0030] Fig.14 It is a schematic diagram of the connecting rod structure.

[0031] Fig.15 It is a structural schematic diagram of the sliding block.

[0032] Fig.16 It is a structural schematic diagram of the sliding block from another angle.

[0033] Fig.17 Schematic diagram of the unlocking buckle.

[0034] Fig.18 This is a schematic diagram of the structure of the unlocking buckle from another angle. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0036] As shown in the figure, a locking and unlocking device for a circuit breaker includes a housing 1, a handle 2, a limiting member 3 and a sliding block 4, wherein the handle 2 is rotatably mounted in the housing 1, the sliding block 4 is linearly slidably mounted in the housing 1 and is located in front of the handle 2, the handle 2 is linked to the sliding block 4, the limiting member 3 is rotatably mounted in the housing 1 and is located in front of the sliding block 4, and the limiting member 3 has a first position exposed outside the housing 1 and staggered with the motion trajectory of the sliding block 4 and a position retracted into the housing 1 to block in front of the sliding block 4 and prevent the handle from closing. In the second position, when the circuit breaker is in the closed state and the limiting member 3 is in the first position, the sliding block 4 is located below the limiting member 3 and within its rotation trajectory; the technical solution ensures the reliable assembly and stable operation of the small circuit breaker through the locking and unlocking device and the cabinet limit of the circuit breaker, and prevents the circuit breaker from being pulled out after being assembled in place; when the circuit breaker is in the closed state, the limiting member and the sliding block resist and cooperate, the limiting member cannot be retracted into the shell, and the circuit breaker cannot be inserted into the cabinet, which prevents the circuit breaker from being installed in place, which is conducive to further improving the reliable assembly and stable operation of the small circuit breaker.

[0037] It also includes an unlocking buckle 5 that can be linearly slidably installed in the shell 1, and the unlocking buckle 5 is located above the sliding block 4. The front end of the unlocking buckle 5 is provided with an extrusion boss 51, and the extrusion boss 51 can be inserted into the gap between the limiting member 3 and the shell 1 to rotate the limiting member 3 to the second position.

[0038] A first opening 11 is provided on the upper surface of the shell 1, and a pressure boss 31 which can pass through the first opening 11 is provided on the upper surface of the limiting member 3. The front end of the limiting member 3 is hingedly installed in the shell 1, and a limiting boss 32 is provided at the rear end of the limiting member 3. The limiting boss 32 is provided with a stop surface 1 33 facing the sliding block 4, and a stop surface 2 41 corresponding to the stop surface 1 33 is provided at the front end of the sliding block 4. The stop surface 1 and the stop surface 2 are matched with each other in an inclined plane. The pressure boss is compressed back into the shell by the cabinet, and the limit boss of the limiting member rotates to the front of the sliding block, just on its movement trajectory.

[0039] The handle 2 is provided with an operating rod 21 extending in a radial direction, a mounting hole 1 22 is provided on the circumference of the handle 2, a mounting hole 2 42 is provided on the sliding block 4, a connecting rod 6 is provided between the mounting hole 1 22 and the mounting hole 2 42 to hinge the two, the handle is controlled to rotate by the operating rod, and the sliding block is driven to move linearly through the connecting rod when the handle rotates.

[0040] It also includes an elastic member 7, and a mounting shaft 52 for mounting the elastic member 7 is provided at the front end of the unlocking buckle 5. One end of the elastic member 7 is mounted on the unlocking buckle 5, and the other end is mounted on the limiting member 3. A baffle 34 is provided on the side of the limiting member 3 to prevent the other end of the elastic member 7 from detaching. The elastic member always provides a pre-tightening force for the limiting member to extend out of the shell.

[0041] The shell 1 is provided with a second opening 12, and the unlocking buckle 5 includes a straight portion 53, an elastic portion 54 and a pushing portion 55 passing through the second opening 12, the pushing portion 55 is located at the end of the unlocking buckle 5, the straight portion 53 is connected to the end position of the elastic portion 54 and the front end positions are independent of each other, the extrusion boss 51 is located at the front end of the straight portion 53, the elastic portion 54 gradually tilts downward along the length direction and a downward extending card platform 1 56 is provided at the front end of the shell 1, which is located in front of the elastic portion 54 in the movement direction and forms a card platform 2 13 with the card platform 1 56 to form a card position cooperation, the elastic portion uses the elasticity of the material to cooperate with the card platform 2 and the card platform 3, the elastic portion and the straight portion are opposite to each other and do not affect each other, and the card position cooperation between the card platform 1 and the card platform 2 can make the unlocking buckle keep the extrusion boss of the straight portion pressing the limiting boss downward until the card platform 1 is separated from the card platform 2, and this state will be cancelled.

[0042] The upper surface of the sliding block 4 is provided with a card platform three 43 corresponding to the card platform one 56, and the card platform three 43 and the card platform one 56 are matched with each other by inclined sliding. The card platform three 43 moves linearly with the sliding block 4 and can push the card platform one 56 to separate from the card platform two 13. When the sliding block moves to the bottom of the card platform one, it will come into contact with it and push the card platform one to separate from the card platform two.

[0043] The second clamping platform 13 is provided with an inclined surface section and a flat surface section in sequence from the back to the front. When the pushing portion 55 moves forward to the inner wall in front of the second opening 12, the first clamping platform 56 just passes over the second clamping platform 13 and forms a clamping fit.

[0044] When the pushing portion 55 moves backward to the inner wall behind the second opening 12, the extrusion boss 51 is pushed backward by the limiting member 3 and the pre-tightening force of the elastic member 7, and the clamping platform 1 56 slides backward on the plane section. After the clamping platform 1 56 enters the inclined section, it slides down from the inclined section to the bottom under the combined action of its own elastic force and the pre-tightening force of the elastic member 7 until the unlocking buckle returns to the initial position. The inclined section and the plane section can be seen. Figure 7 The length of the second opening has requirements and must meet the above two conditions, which plays a limiting role.

[0045] The extrusion boss 51 is in an acute angle shape. A slope 35 is provided on the upper surface of the limiting boss 32 . A gap is formed between the slope 35 and the inner wall of the housing 1 for the extrusion boss 51 to be inserted.

[0046] The specific states of the locking and unlocking device of this embodiment are as follows:

[0047] When the circuit breaker is in the open state, the limiting member is pressed against the shell under the action of the elastic member, and the pressure boss of the limiting member is exposed outside the shell; the circuit breaker is pushed into the cabinet, the pressure boss of the limiting member is pressed down by the cabinet, and the circuit breaker is pushed into the cabinet. When the circuit breaker is pushed into place, the pressure boss of the limiting member is stuck on the cabinet under the action of the elastic member.

[0048] When the circuit breaker is installed in place, push the handle to close the circuit breaker.

[0049] If the circuit breaker is not installed in place, the pressure boss of the limiting member is pressed down by the cabinet, and the abutment surface 1 of the limiting boss of the limiting member presses against the abutment surface 2 of the sliding block, so the handle cannot be closed.

[0050] When the circuit breaker is in the closed state, the limiting boss of the limiting member presses against the second abutting surface of the sliding block; when the circuit breaker is pushed into the cabinet, the cabinet will jam the pressed boss, so that the circuit breaker cannot be pushed into the cabinet.

[0051] When the circuit breaker is disassembled, the pushing portion of the unlocking buckle needs to be pushed forward. While moving forward, the extrusion boss of the unlocking buckle will be inserted into the gap formed between the slope 35 and the inner wall of the housing 1. At this time, the limiting member rotates under the push of the unlocking buckle. When the unlocking buckle is stuck and cannot be pushed forward (the pushing portion of the unlocking buckle reaches the inner wall in front of the second opening, such as Figure 4 As shown in FIG. 1 ), the unlocking buckle is hung on the housing and is in a fixed state (the first clamping platform of the unlocking buckle and the second clamping platform of the housing form a clamping position, as shown in FIG. Figure 5 As shown in the figure), the limiting boss of the limiting piece rotates downward, and the limiting boss of the limiting piece presses against the sliding block, so the handle cannot be closed; at this time, the circuit breaker can be pulled out of the cabinet.

[0052] When the circuit breaker needs to be reinstalled, pull the handle to push the sliding block forward. The third card platform of the sliding block lifts the first card platform of the unlocking buckle, so that the unlocking buckle is unlocked (card platform 1 is separated from card platform 2, such as Figure 6 and 7 As shown in the figure); at the same time, the second abutment surface of the sliding block presses against the limiting boss of the limiting member, so that the limiting boss of the limiting member moves upward, and the limiting boss of the limiting member presses against the extrusion boss of the unlocking buckle at the same time, and the two are matched with inclined surfaces, providing the unlocking buckle with a thrust to slide backward on the plane section and the combined force of the pre-tightening force of the elastic member 7. This combined force causes the card platform 1 to move along the entire plane section, because the limiting boss of the limiting member and the extrusion boss of the unlocking buckle have been out of contact at this time. At this time, the power for the unlocking buckle to retreat comes from the combined force of the elastic force of the elastic part itself and the pre-tightening force of the elastic part. The card platform 1 slides down along the inclined section, and when it slides down to the bottom, the pushing part reaches the rearmost position of the first opening, as shown in the figure. Figure 3 Position shown.

[0053] The elastic member in this embodiment always exerts a thrust on the unlocking buckle because both ends of the elastic member are in a compressed state, one end is fixed on the unlocking buckle and the other end is fixed on the limiting member. The elastic preload force always makes the unlocking buckle tend to return to its initial position.

[0054] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be 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. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0056] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A locking and unlocking device for a circuit breaker, characterized in that: The invention comprises a housing (1), a handle (2), a limiting member (3) and a sliding block (4); the handle (2) is rotatably mounted in the housing (1); the sliding block (4) is linearly slidably mounted in the housing (1) and is located in front of the handle (2); the handle (2) and the sliding block (4) are linked and connected; the limiting member (3) is rotatably mounted in the housing (1) and is located in front of the sliding block (4); the limiting member (3) has a first position in which it is exposed outside the housing (1) and is offset from the movement trajectory of the sliding block (4); and a second position in which it is retracted into the housing (1) and is blocked in front of the sliding block (4) and prevents the handle from closing; when the circuit breaker is in the closed state and the limiting member (3) is in the first position, the sliding block (4) is located below the limiting member (3) and in its rotation trajectory.

2. The locking and unlocking device for a circuit breaker according to claim 1, characterized in that: It also includes an unlocking buckle (5) linearly slidably mounted in the shell (1), the unlocking buckle (5) being located above the sliding block (4), and a pressing boss (51) being provided at the front end of the unlocking buckle (5), the pressing boss (51) being inserted into the gap between the limiting member (3) and the shell (1) and causing the limiting member (3) to rotate to the second position.

3. The locking and unlocking device of a circuit breaker according to claim 2, characterized in that: The shell (1) is provided with a first opening (11) on its upper surface, the limiting member (3) is provided with a pressure-bearing boss (31) on its upper surface which can pass through the first opening (11), the limiting member (3) is hingedly mounted at its front end in the shell (1), the limiting member (3) is provided with a limiting boss (32) at its rear end, the limiting boss (32) is provided with a first stopper surface (33) facing the sliding block (4), and the sliding block (4) is provided with a second stopper surface (41) corresponding to the first stopper surface (33) at its front end.

4. The locking and unlocking device for a circuit breaker according to claim 1, characterized in that: The handle (2) is provided with an operating rod (21) extending in a radial direction, a mounting hole (22) is provided in the circumference of the handle (2), a mounting hole (42) is provided on the sliding block (4), and a connecting rod (6) is provided between the mounting hole (22) and the mounting hole (42) for hingedly connecting the two.

5. The locking and unlocking device for a circuit breaker according to claim 2, characterized in that: It also comprises an elastic member (7), a mounting shaft (52) for mounting the elastic member (7) is provided at the front end of the unlocking buckle (5), one end of the elastic member (7) is mounted on the unlocking buckle (5), and the other end of the elastic member (7) is mounted on the limiting member (3), and a baffle (34) is provided on the side of the limiting member (3) to prevent the other end of the elastic member (7) from being separated.

6. The locking and unlocking device of a circuit breaker according to claim 5, characterized in that: The housing (1) is provided with a second opening (12); the unlocking buckle (5) comprises a straight portion (53), an elastic portion (54) and a pushing portion (55) passing through the second opening (12); the pushing portion (55) is located at the end of the unlocking buckle (5); the straight portion (53) is connected to the end position of the elastic portion (54) and the front end positions are independent of each other; the extrusion boss (51) is located at the front end of the straight portion (53); the elastic portion (54) gradually tilts downward along the length direction and a first card platform (56) extending downward is provided at the front end thereof; and the housing (1) is provided with a second card platform (13) in front of the elastic portion (54) in the moving direction and forming a card position with the first card platform (56).

7. The locking and unlocking device for a circuit breaker according to claim 6, characterized in that: The upper surface of the sliding block (4) is provided with a card platform three (43) corresponding to the card platform one (56), and the card platform three (43) and the card platform one (56) are matched with each other by inclined sliding. The card platform three (43) moves linearly with the sliding block (4) and pushes the card platform one (56) to separate from the card platform two (13).

8. The locking and unlocking device of a circuit breaker according to claim 6, characterized in that: The second card platform (13) is provided with an inclined surface section and a flat surface section in sequence from the back to the front, and when the pushing portion (55) moves forward to the inner wall in front of the second opening (12), the first card platform (56) just passes over the second card platform (13) and forms a locking fit; During the process of the pushing portion (55) moving backward to the rear inner wall of the second opening (12), the extrusion boss (51) is subjected to the combined force of the backward thrust of the limiting member (3) and the preload force of the elastic member (7), and the clamping platform (56) slides backward on the plane section. After the clamping platform (56) enters the inclined section, it slides down from the inclined section to the bottom under the combined force of its own elastic force and the preload force of the elastic member (7) until the unlocking buckle returns to the initial position.

9. The locking and unlocking device for a circuit breaker according to claim 3, characterized in that: The extrusion boss (51) is in an acute angle shape, and a slope (35) is provided on the upper surface of the limiting boss (32), and a gap is formed between the slope (35) and the inner wall of the shell (1) for the extrusion boss (51) to be inserted.

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