Circuit breaker operating mechanism

Abstract

The utility model discloses a circuit breaker operating mechanism, which comprises a shell, a driving assembly, a swing rod, a lock catch, a moving contact, a static contact and a tension spring, the side, facing the static contact, of the driving assembly is provided with an ejector rod capable of linearly stretching out and drawing back. The lock catch is rotationally installed on the shell, the lower end of the lock catch is provided with an inclined locking surface, the upper end of the lock catch abuts against the limiting rod, and the limiting rod is located on the side, back to the static contact, of the lock catch; the moving contact is located between the driving assembly and the static contact, the lower end of the moving contact is rotatably installed on the shell, and the upper end of the moving contact is in separated contact with the static contact; the swing rod is arranged between the static contact and the driving assembly and comprises a hinge part, a limiting part and a stress part; one end of the tension spring is fixed on the shell, the other end of the tension spring is connected to one side, opposite to the static contact, of the moving contact, and the tension direction of the tension spring is consistent with the opening rotation direction of the moving contact. According to the utility model, normal switching-on and switching-off as well as tripping and switching-off during short circuit or overload can be automatically realized, and the requirements of 5G communication, intelligent power grids, intelligent homes and the like can be effectively met.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical equipment technology, specifically relating to a circuit breaker operating mechanism. Background Technology

[0002] With the increasing intelligence and digitalization of low-voltage power distribution, traditional manually operated circuit breakers are increasingly unable to meet the needs of applications such as 5G communication, smart grids, and smart homes. Therefore, a new type of automatically operating mechanism is needed to meet the intelligent requirements of miniature circuit breakers. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a novel circuit breaker operating mechanism capable of automatic operation, meeting the needs of applications such as 5G communication, smart grids, and smart homes.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A circuit breaker operating mechanism includes a housing and a drive assembly, a rocker arm, a latch, a moving contact, a stationary contact, and a tension spring, all installed within the housing. The drive assembly has a linearly extendable push rod facing the stationary contact. The latch is rotatably mounted on the housing via a pin at its center, with an inclined locking surface at its lower end and its upper end abutting against a pre-set limiting rod on the housing. The limiting rod is located on the side of the latch facing away from the stationary contact. The moving contact is located between the drive assembly and the stationary contact, with its lower end... The moving contact is rotatably mounted on the housing via a pin, with its upper end in separate contact with the stationary contact. The rocker arm is positioned between the stationary contact and the drive assembly, and includes a hinge, a limiting part, and a force-bearing part. The hinge is hinged to the middle of the moving contact via a hinge shaft. The limiting part has a protrusion that matches the inclined locking surface of the latch. The force-bearing part is aligned with the push rod. One end of the tension spring is fixed to the housing, and the other end is connected to the side of the moving contact facing away from the stationary contact. The tension direction of the tension spring is consistent with the opening rotation direction of the moving contact.

[0006] Furthermore, to facilitate automatic reset after the latch is tripped, the circuit breaker operating mechanism also includes a reset spring. The reset spring is mounted on a pin, with one end connected to the housing and the other end connected to the upper end of the latch. It is used to automatically reset the latch to the limit rod position after tripping. The elastic force of the reset spring is opposite to the counterclockwise rotation direction of the latch.

[0007] Furthermore, to ensure that the lower end of the force-bearing part of the swing arm remains in contact with the base rib plate during the closing process and after the opening process, the circuit breaker operating mechanism also includes a second reset spring and a base rib plate. The second reset spring is sleeved on the second pin, with one end fixed to the housing and the other end connected to the swing arm, so as to keep the lower end of the force-bearing part of the swing arm in contact with the base rib plate. The elastic force of the second reset spring is opposite to the clockwise rotation direction of the swing arm. The base rib plate is horizontally fixed to the housing and located below the drive assembly and the swing arm.

[0008] Furthermore, to ensure that the circuit breaker operating mechanism can trip in the event of a short circuit or overload, the latch can rotate counterclockwise under external force, causing its inclined locking surface to disengage from the protrusion of the rocker arm, thereby achieving tripping. The external force acting on the latch is the thrust of the manual operating lever, the auxiliary electromagnetic actuator, or the bimetallic thermal trip device. The manual operating lever, the auxiliary electromagnetic actuator, or the bimetallic thermal trip device is fixedly connected to a pin, and the counterclockwise rotation of the latch is achieved by pushing the pin.

[0009] This utility model has a reasonable structure, is simple to operate, and can automatically operate to realize normal opening and closing of circuits, as well as tripping and opening in case of short circuit or overload. It can effectively meet the needs of applications such as 5G communication, smart grids, and smart homes. Attached Figure Description

[0010] The structure of this utility model will be further described in detail below with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the circuit breaker operating mechanism of the present invention in the open state.

[0012] Figure 2 This is a schematic diagram of the circuit breaker operating mechanism of the present invention in the closed state.

[0013] Figure 3 This is a schematic diagram of the circuit breaker operating mechanism of the present invention in the tripped state.

[0014] Figure 4 This is a schematic diagram of the structure of the latch described in this utility model.

[0015] Figure 5 This is a schematic diagram of the structure of the moving contact described in this utility model.

[0016] The figure shows: 1-drive assembly, 101-top rod, 2-swing rod, 21-hinge part, 22-limiting part, 221-protrusion, 23-force-bearing part, 24-hinge shaft, 3-lock, 31-inclined locking surface, 4-reset spring one, 5-moving contact, 51-contact head, 52-hook, 53-waist-shaped hole, 6-stationary contact, 7-reset spring two, 8-tension spring, 9-housing, 91-limiting rod, 92-guide groove, 10-base rib plate. Detailed Implementation

[0017] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. The described embodiments are merely some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0019] In the description of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. It should be noted that the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Example 1

[0020] like Figure 1-5As shown, this embodiment provides a circuit breaker operating mechanism, including a housing 9 and a drive assembly 1, a rocker arm 2, a latch 3, a moving contact 5, a stationary contact 6, and a tension spring 8 respectively installed in the housing 9.

[0021] The housing 9 serves as the mounting base.

[0022] The stationary contact 6 is fixed on the stationary contact 6.

[0023] The drive assembly 1 is arranged laterally, and a linearly retractable push rod 101 is provided on the side of the drive assembly 1 facing the stationary contact 6. The drive assembly 1 is an electromagnetic actuator, and the push rod 101 is a movable iron core of an electromagnet. The extension and retraction direction of the push rod is parallel to the normal direction of the contact surface between the moving contact 5 and the stationary contact 6. The drive assembly 1 can also be an electric push rod, a hydraulic push rod, a rack and pinion linear drive mechanism, or other mechanisms capable of linear reciprocating movement. In this embodiment, an electromagnetic actuator is preferred.

[0024] The latch 3 is V-shaped. The middle part of the latch 3 is rotatably mounted on the housing 9 via a pin 11 (the middle part of the latch 3 is fixedly connected to the pin 11 and can rotate with the pin 11). The lower end of the latch 3 is provided with an inclined locking surface 31, which is an arc-shaped convex surface. The upper end of the latch 3 abuts against a preset limiting rod 91 on the housing 9. The limiting rod 91 is located on the side of the latch 3 facing away from the stationary contact (6) (located on the right side of the pin 11) to limit the initial position of the latch 3. Initially, the upper end of the latch 3 abuts against the limiting rod 91 on its right side. The limiting rod 91 can also limit the counterclockwise rotation angle of the latch 3. When the limiting rod 91 rotates counterclockwise until it disengages from the swing rod 2, the latch 3 is blocked by the limiting rod 91 and cannot continue to rotate.

[0025] The moving contact 5 is located between the driving assembly 1 and the stationary contact 6. The lower end of the moving contact 5 is rotatably mounted on the housing 9 via a second pin 12 (the second pin 12 is fixed on the housing 9, and the pre-set waist-shaped hole 53 at the lower end of the moving contact 5 is rotatably mounted on the second pin 12, so that the moving contact 5 can rotate around the second pin 12 and move along the waist-shaped hole 53). The upper end of the moving contact 5 is provided with a contact head 51 that is in separate contact with the stationary contact 6; the moving contact 5 can swing back and forth around the second pin 12.

[0026] The rocker arm 2 is disposed between the stationary contact 6 and the drive assembly 1, and includes a hinge part 21, a limiting part 22, and a force-receiving part 23; the hinge part 21 is hinged to the middle of the moving contact 5 through a hinge shaft 24; the limiting part 22 is provided with a protrusion 221 that matches the inclined locking surface 31 of the latch 3, and the protrusion 221 has a spherical structure; the force-receiving part 23 is aligned with the push rod 101 so that it is pushed by the push rod 101 to move towards the stationary contact 6 when the push rod 101 is extended.

[0027] One end of the tension spring 8 is fixed to the housing 9, and the other end is connected to the lug 52 on the side of the moving contact 5 facing away from the stationary contact 6. The tension direction of the tension spring 8 is the same as the opening rotation direction of the moving contact 5. The connection between the tension spring 8 and the moving contact 5 (that is, the pre-set lug 52 on the moving contact 5) is located between the second pin 12 and the hinge pin 24.

[0028] The thrust of the drive assembly 1 on the rocker arm 2 is between the rotation center of the rocker arm 2 and the moving contact 5 (the center line of the hinge shaft 24) and the contact point between the rocker arm 2 and the latch 3 (the contact point between the inclined locking surface 31 and the protrusion 221). Example 2

[0029] To better coordinate with the pushing of the push rod 101 and improve its service life, this embodiment adds the following settings based on embodiment 1.

[0030] The thickness of the force-bearing part 23 is greater than that of other areas of the swing rod 2, increasing the contact surface with the top rod 101. Both the contact surfaces of the force-bearing part 23 and the top rod 101 are coated with a wear-resistant ceramic coating. The contact surface between the force-bearing part 23 and the top rod 101 is an arc-shaped convex surface. Example 3

[0031] To provide stable guidance for the movement of the moving contact 5, this embodiment adds the following settings based on embodiment 1 or 2.

[0032] A guide groove 92 is provided on the housing 9. The guide groove 92 is arc-shaped, and a guide rod that can slide along the guide groove 92 is provided on the moving contact 5. Example 4

[0033] To facilitate automatic reset after the circuit breaker trips, this embodiment adds the following settings based on any one of embodiments 1-3.

[0034] The circuit breaker operating mechanism also includes a reset spring 4, which is a torsion spring with two torsion arms. The reset spring 4 is sleeved on the pin 11, with one end (one torsion arm) connected to the housing (9) and the other end (the other torsion arm) connected to the upper end of the latch 3. It is used to automatically reset the latch 3 to the position of the limit rod 91 after the circuit breaker is opened. The direction of the elastic force of the reset spring 4 is opposite to the counterclockwise rotation direction of the latch 3. Example 5

[0035] To ensure that the lower end of the force-bearing part of the swing arm remains in contact with the base rib plate during the closing process and after the opening process, this embodiment adds the following settings based on any one of embodiments 1-3.

[0036] The circuit breaker operating mechanism also includes a second reset spring 7 and a base rib plate 10. The second reset spring 7 is sleeved on the second pin 12 and is also a torsion spring with two torsion arms. One end (one of the torsion arms) is fixed to the housing 9, and the other end is connected to the rocker arm 2. It is used to keep the lower end of the force-bearing part 23 of the rocker arm 2 in contact with the base rib plate 10. The elastic force of the second reset spring is opposite to the clockwise rotation direction of the rocker arm 2. The base rib plate 10 is laterally fixed on the housing 9 and located below the drive assembly 1 and the rocker arm 2. Example 6

[0037] To ensure that the circuit breaker operating mechanism can trip in the event of a short circuit or overload, the latch can rotate counterclockwise under external force, causing its inclined locking surface 31 to disengage from the protrusion of the rocker arm 2, thereby achieving tripping and tripping.

[0038] The latch 3 can rotate counterclockwise under external force until it contacts the limiting rod 91, causing its inclined locking surface 31 to disengage from the protrusion 221 of the swing rod 2, thereby achieving tripping and opening. The external force acting on the latch 3 is the thrust of the manual operating lever, the auxiliary electromagnetic actuator, or the bimetallic thermal tripping device.

[0039] Working principle:

[0040] (1) The process from opening to closing the switch.

[0041] like Figure 1 As shown, when the circuit breaker needs to switch from the open state to the closed state, the control circuit sends a closing control signal to the drive assembly 1. The drive assembly 1 is energized to generate electromagnetic force, causing the push rod 101 to extend. The push rod 101 moves towards the swing rod and contacts the force-bearing part 23 of the swing rod 2, pressing against the swing rod 2 and pushing the swing rod 2 to rotate around the hinge shaft 24 towards the stationary contact. When the rocker arm 2 rotates until the protrusion 221 of its upper limiting part 22 contacts the inclined locking surface 31 of the latch 3, a clockwise rotation force is applied to the latch 3. However, due to the restriction of the upper end of the latch 3 by the limiting rod 91, it is difficult to rotate clockwise, which makes it difficult for the upper end of the limiting part 22 of the rocker arm 2 to continue rotating towards the stationary contact. Then, under the push of the top rod 101, the lower end of the limiting part 22 and the hinge part 21 connected to it rotate around the center of the contact point between the protrusion 221 and the inclined locking surface 31 towards the stationary contact 6. During the rotation, the moving contact 5 is pushed by the hinge shaft 24 to overcome the elastic force of the tension spring 8 (tension spring stretching and storing energy), causing the moving contact 5 to rotate around the pin shaft 2 towards the stationary contact 6, and finally causing the contact head 51 of the moving contact 5 to abut against the stationary contact 6 (achieving the desired effect). Figure 2 (As shown in the figure), complete the closing operation. At this time, the holding function of drive component 1 is activated. Even if the closing control signal disappears, drive component 1 will still keep the push rod 101 extended, maintaining the circuit breaker closed.

[0042] (2) Circuit breaker tripping process.

[0043] like Figure 2 As shown, when the circuit breaker needs to switch from the closed state to the open state, the control circuit sends a opening control signal to the drive assembly 1. The drive assembly 1 reverses its action, the push rod 101 retracts, and the moving contact 5 rotates in the opposite direction under the tension of the tension spring 8 (the tension spring 8 releases its energy). The moving contact 5 separates from the stationary contact 6, completing the opening operation. After opening, the moving contact 5 stops when it hits the right end of the base rib plate 10 or is stopped by the stop bar on the upper right side of the housing 9. During the rotation of the moving contact 5, it first pushes the swing rod 2 to rotate clockwise through the hinge shaft 24. However, due to the limited rotation of the upper limit part 23 of the swing rod 2, it can only move laterally along the base rib plate 10 until it disengages from the lower end of the latch 3 and the moving contact 5 stops moving. Only then does the swing rod 2 rotate clockwise under the elastic force of the return spring 7 until it contacts the base rib plate 10 (e.g., Figure 1 (As shown). Drive assembly 1 keeps the push rod retracted, maintaining the circuit breaker open.

[0044] (3) Tripping process.

[0045] like Figure 3 As shown, when there is a short circuit or overload, the latch 3 rotates counterclockwise under the push of an external force (manual operating lever, auxiliary electromagnetic actuator, or bimetallic thermal trip device). The inclined locking surface 31 of the latch 3 disengages from the protrusion 221 of the rocker arm 2 under rotation, and the latch 3 and the rocker arm 2 disengage. The rotation of the rocker arm 2 is no longer restricted, and the moving contact 5 rotates away from the stationary contact 6 under the action of the tension spring 8, realizing the tripping and opening. During the rotation of the moving contact 5, the rocker arm 2 is first pushed clockwise by the hinge shaft 24 (overcoming the elastic force of the return spring 7) until the moving contact 5 is blocked and stops moving. Then, the rocker arm 2 rotates clockwise under the elastic force of the return spring 7. Since the push rod 101 of the drive assembly 1 is in the extended state, the rocker arm 2 is blocked by the push rod 101 and stops rotating.

[0046] In practical use, the control circuit can be programmed and adjusted according to different application scenarios and control requirements to achieve precise control of the circuit breaker's opening and closing.

[0047] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0048] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A circuit breaker operating mechanism comprising a housing (9) and a drive assembly (1), a swing lever (2), a latch (3), a movable contact (5), a stationary contact (6) and a tension spring (8) respectively mounted in the housing (9); characterized in that: the drive assembly (1) is provided with a top rod (101) capable of linear expansion on the side facing the stationary contact (6); the middle part of the latch (3) is rotatably mounted on the housing (9) by a pin shaft (11), the lower end of the latch (3) is provided with an inclined locking surface (31), and the upper end of the latch (3) abuts against a limiting rod (91) pre-provided on the housing (9), the limiting rod (91) being located on the side of the latch (3) facing away from the stationary contact (6); the movable contact (5) is located between the drive assembly (1) and the stationary contact (6), the lower end of the movable contact (5) is rotatably mounted on the housing (9) by a pin shaft (12), and the upper end of the movable contact (5) is separated from the stationary contact (6); the swing lever (2) is arranged between the stationary contact (6) and the drive assembly (1) and comprises a hinged part (21), a limiting part (22) and a force receiving part (23); the hinged part (21) is hingedly connected to the middle part of the movable contact (5) by a hinge shaft (24); the limiting part (22) is provided with a protrusion (221) matching the inclined locking surface (31) of the latch (3); and the force receiving part (23) is aligned with the top rod (101); one end of the tension spring (8) is fixed to the housing (9), and the other end is connected to the side of the movable contact (5) facing away from the stationary contact (6), the tension direction of the tension spring (8) being consistent with the opening direction of the movable contact (5).

2. The circuit breaker operating mechanism of claim 1, wherein: the drive assembly (1) is an electromagnetic driver, the top rod (101) is a movable iron core of the electromagnet, and the expansion direction of the top rod (101) is parallel to the normal direction of the contact surface between the movable contact (5) and the stationary contact (6).

3. The circuit breaker operating mechanism of claim 1, wherein: the inclined locking surface (31) of the latch (3) is an arc convex surface, and the protrusion (221) of the swing lever (2) is a spherical surface structure matching the same.

4. The circuit breaker operating mechanism of claim 1, wherein: the thickness of the force receiving part (23) is greater than that of other parts of the swing lever (2), and a wear-resistant ceramic coating is provided on the contact surface between the force receiving part (23) and the top rod (101).

5. The circuit breaker operating mechanism of claim 1, wherein: the connection between the tension spring (8) and the movable contact (5) is located between the pin shaft (12) and the hinge shaft (24).

6. The circuit breaker operating mechanism of claim 1, wherein: a reset spring (4) is further included, the reset spring (4) is sleeved on the pin shaft (11), one end of the reset spring (4) is connected to the housing (9), and the other end is connected to the upper end of the latch (3), for automatically resetting the latch (3) to the position of the limiting rod (91) after opening, and the elastic force direction of the reset spring (4) is opposite to the counterclockwise rotation direction of the latch (3).

7. The circuit breaker operating mechanism of claim 1, wherein: Reset spring two (7) and base rib plate (10) are further included, the reset spring two (7) is sleeved on the pin shaft two (12), one end is fixed on the shell (9), the other end is connected on the swing lever (2), for making the force receiving part (23) lower end of the swing lever (2) keep in contact with the base rib plate (10), the elastic force direction of the reset spring two (7) is opposite to the clockwise rotation direction of the swing lever (2);The base rib plate (10) is transversely fixed on the shell (9) and is located below the driving assembly (1) and the swing lever (2).

8. The circuit breaker operating mechanism of claim 1, wherein: A guide slot (92) is arranged on the shell (9), and a guide rod corresponding to the guide slot (92) is arranged on the movable contact (5).

9. The circuit breaker operating mechanism of any of claims 1-8, wherein: The lock catch (3) can rotate counterclockwise under the action of external force, so that the inclined locking surface (31) of the lock catch (3) is out of contact with the protrusion (221) of the swing lever (2), so as to realize the tripping and opening of the switch.

10. The circuit breaker operating mechanism of claim 9, wherein: The external force acting on the lock catch (3) is the thrust of the manual operating rod or the auxiliary electromagnetic driver or the bimetallic strip thermal release device.

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