Load switch cam structure

Abstract

The utility model relates to a load switch cam structure which is arranged in a shell of an intelligent electric meter. Comprising a first rotating shaft arranged on a shell, a rotating shaft support arranged on the first rotating shaft, a moving contact arranged on the rotating shaft support, a cam assembly driving the rotating shaft support to rotate around the first rotating shaft, a reset piece limiting rotation of the rotating shaft support, and a static contact arranged in the shell. In the first position, the cam assembly applies driving force to the rotating shaft support, and the moving contact abuts against the static contact. And in the second position, the cam assembly relieves the driving force on the rotating shaft bracket, and the moving contact is separated from the static contact. Driving force is applied to the rotating shaft support through the cam assembly to achieve and maintain abutting of the moving contact and the static contact, the abutting stability of the moving contact and the static contact is improved, when a load circuit is disconnected, under the action of the reset piece, the moving contact and the static contact can be rapidly separated, generation of electric arcs is reduced, safety is improved, the overall structure is simple, and cost is low. The cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of load switches, in particular to a load switch cam structure. Background Art

[0002] The load switch controls the circuit through manual or automatic operation and can cut off the rated load current and a certain overload current. However, there are the following problems during use: when the load switch disconnects the load circuit, the disengagement speed of the moving contact and the static contact cannot meet the requirements, and the arc between the moving contact and the static contact cannot be extinguished quickly, resulting in burning of the moving and static contacts.

[0003] Therefore, there is a need for a load switch cam structure that can achieve rapid separation of a moving contact and a static contact, reduce the generation of arcs, improve safety, and has a simple structure and low cost. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a load switch cam structure.

[0005] The technical solution of this utility model is as follows:

[0006] A load switch cam structure is provided in a housing of the load switch, comprising a first rotating shaft provided on the housing, a rotating shaft support provided on the first rotating shaft, a moving contact provided on the rotating shaft support, a cam assembly for driving the rotating shaft support to rotate around the first rotating shaft, a reset member for limiting the rotation of the rotating shaft support, and a static contact provided in the housing;

[0007] In the first position, the cam assembly applies a driving force to the rotating shaft bracket, and the moving contact abuts against the static contact;

[0008] In the second position, the cam assembly releases the driving force on the rotating shaft bracket, and the moving contact is separated from the static contact.

[0009] As a further improvement of the present invention, the cam assembly includes a second rotating shaft arranged in the housing, a gear portion arranged on the second rotating shaft, and a cam portion arranged on the gear portion. When in the first position, the cam portion abuts against the rotating shaft bracket and applies driving force to the rotating shaft bracket.

[0010] As a further improvement of the present invention, the rotating shaft bracket includes a main body rotating around the first rotating shaft, and a connecting hole and a connecting part are provided on the main body. The connecting hole is used to be connected to the reset member. When in the first position, the connecting part abuts against the cam assembly and bears the driving force from the cam assembly.

[0011] As a further improvement of the present invention, a limiting member is further included, which limits the rotation of the cam assembly.

[0012] As a further improvement of the present invention, the limiting member is a micro switch provided on the housing, and the cam assembly rotates to press or release the micro switch.

[0013] As a further improvement of the present invention, there are multiple moving contacts and multiple static contacts, and the number of the moving contacts is the same as that of the static contacts and they correspond one to one.

[0014] As a further improvement of the present invention, an energy storage component is provided between the moving contact and the rotating shaft bracket.

[0015] As a further improvement of the present invention, the energy storage component is a torsion spring.

[0016] As a further improvement of the present invention, a slot is provided on the rotating shaft bracket, the first end of the torsion spring is arranged on the rotating shaft bracket, and the second end of the torsion spring abuts against the moving contact and presses the moving contact into the slot.

[0017] As a further improvement of the present invention, the reset member is a tension spring, one end of the tension spring is arranged on the housing, and the other end of the tension spring is connected to the rotating shaft bracket.

[0018] According to the utility model of the above solution, the beneficial effects of the utility model are:

[0019] The utility model realizes and maintains the abutment between the moving contact and the static contact by applying driving force to the rotating shaft bracket by the cam assembly, thereby improving the stability of the abutment between the two. When the load circuit is disconnected, the cam assembly releases the driving force on the rotating shaft bracket, and under the action of the reset member, the moving contact and the static contact can be quickly separated, reducing the generation of arcs and improving safety. The overall structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the first position of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the second position of the utility model;

[0022] Figure 3 This is a structural diagram of the first angle of the rotating shaft bracket of the utility model;

[0023] Figure 4 This is a structural diagram of the second angle of the rotating shaft bracket of the utility model.

[0024] In the figure: 30, first rotating shaft; 31, rotating shaft bracket; 311, main body; 312, connecting hole; 313, connecting part; 314, slot; 32, moving contact; 33, reset member; 34, static contact; 35, second rotating shaft; 36, gear part; 37, cam part; 38, micro switch; 39, torsion spring. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] 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 internal communication between 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, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] The utility model provides a load switch cam structure, which is arranged in the housing of the load switch, including a first rotating shaft 30 arranged on the housing, a rotating shaft bracket 31 arranged on the first rotating shaft 30, a moving contact 32 arranged on the rotating shaft bracket 31, a cam assembly driving the rotating shaft bracket 31 to rotate around the first rotating shaft 30, a reset member 33 limiting the rotation of the rotating shaft bracket 31, and a static contact 34 arranged in the housing;

[0029] See also Figure 1 In the first position, the cam assembly applies a driving force to the shaft bracket 31, and the moving contact 32 abuts against the static contact 34;

[0030] See also Figure 2 In the second position, the cam assembly releases the driving force on the rotating shaft bracket 31, and the moving contact 32 is separated from the static contact 34;

[0031] The present invention applies a driving force to the rotating shaft bracket 31 through the cam assembly to achieve and maintain the abutment between the moving contact 32 and the static contact 34, thereby improving the stability of the abutment between the two. When the load circuit is disconnected, the cam assembly releases the driving force on the rotating shaft bracket 31, and under the action of the reset member 33, the moving contact 32 and the static contact 34 can be quickly separated, reducing the generation of arcs and improving safety. The overall structure is simple and the cost is low.

[0032] As an embodiment of the present invention, the cam assembly includes a second rotating shaft 35 provided in the housing, a gear portion 36 provided on the second rotating shaft 35, and a cam portion 37 provided on the gear portion 36. The gear portion 36 is engaged with the driving mechanism in the load switch, and the driving mechanism drives the gear portion 36 to rotate. In the first position, the cam portion 37 abuts against the rotating shaft bracket 31 and applies a driving force to the rotating shaft bracket 31, thereby achieving abutment between the moving contact 32 and the static contact 34 and maintaining stationary state, thereby ensuring stable contact between the moving contact 32 and the static contact 34. When the load circuit is disconnected, the driving mechanism drives the gear portion 36 to rotate in the opposite direction, the cam portion 37 releases the driving force on the rotating shaft bracket 31, and under the action of the reset member 33, the rotating shaft bracket 31 is driven to rotate further, thereby realizing the rapid separation of the moving contact 32 and the static contact 34. Through the structure combined with the gear portion 36 and the cam portion 37, it is only necessary to control the rotation of the gear portion 36 to realize the rotation control of the rotating shaft bracket 31 and the switching of the abutment or separation between the moving contact 32 and the static contact 34. The overall structure is simple and easy to control.

[0033] As an embodiment of the present invention, the center of the gear portion 36 coincides with the center of the cam portion 37, ensuring that the gear portion 36 and the cam portion 37 rotate only around the same center when rotating, which can effectively reduce the overall occupied space and improve space utilization.

[0034] See also Figure 3 and Figure 4As an embodiment of the present invention, the shaft bracket 31 includes a body 311 that rotates around the first shaft 30. The body 311 is provided with a connecting hole 312 and a connecting portion 313. The connecting hole 312 is used to connect with the reset member 33. The reset member 33 transmits the force to the body 311 through the connecting hole 312 to realize the overall rotation of the shaft bracket 31. When in the first position, the connecting portion 313 abuts against the cam assembly and bears the driving force from the cam assembly, that is, the driving force of the cam assembly is greater than the force of the reset member 33, realizing the abutment between the moving contact 32 and the static contact 34. When the disconnection When the circuit is loaded, the cam assembly releases the driving force on the connecting portion 313, and the shaft bracket 31 rotates only under the force of the reset member 33, thereby realizing the separation between the moving contact 32 and the static contact 34. The connecting hole 312 and the connecting portion 313 are respectively located on both sides of the shaft bracket 31, so that the force from the reset member 33 and the driving force from the cam assembly are mutually opposite forces, and the rotation direction of the shaft bracket 31 is controlled by the magnitude relationship between the two forces, thereby realizing the abutment or separation between the moving contact 32 and the static contact 34. The overall structure is simple and easy to control, which improves practicality.

[0035] As an embodiment of the present invention, the load switch cam structure also includes a limiter, which limits the rotation of the cam assembly to avoid unnecessary damage caused by endless rotation of the cam assembly, that is, when the load circuit needs to be closed and the moving contact 32 abuts against the static contact 34, or when the load circuit needs to be disconnected and the moving contact 32 is separated from the static contact 34, the limiter sends a limit signal to stop the cam assembly from moving. Preferably, the limiter is a micro switch 38 provided on the housing, and the cam assembly rotates to press or release the micro switch 38, that is, when the load circuit needs to be closed, the drive mechanism drives the cam assembly to rotate to achieve the abutment of the moving contact 32 and the static contact 34, and press the micro switch 38. The micro switch 38 transmits a signal to the drive mechanism to stop the cam assembly from continuing to rotate. When the load circuit needs to be disconnected, the drive mechanism drives the cam assembly to rotate to achieve the separation of the moving contact 32 and the static contact 34, and release the micro switch 38, and the drive mechanism stops the cam assembly from continuing to rotate.

[0036] As an embodiment of the present utility model, there are multiple moving contacts 32 and multiple static contacts 34. The number of moving contacts 32 and the static contacts 34 are the same and correspond one to one. The use of a multi-contact structure can effectively reduce the contact resistance between the moving contact 32 and the static contact 34, reduce temperature rise, increase the service life of the moving contact 32 and the static contact 34, and improve the overall safety of use.

[0037] As an embodiment of the present invention, an energy storage component is provided between the moving contact 32 and the rotating shaft bracket 31. When the moving contact 32 abuts against the static contact 34, the energy storage component stores a certain amount of energy. When the load circuit is disconnected, the energy stored in the energy storage component is released, thereby promoting the rapid separation of the moving contact 32 and the static contact 34. Preferably, the energy storage component is a torsion spring 39. A slot 314 is provided on the rotating shaft bracket 31. The first end of the torsion spring 39 is provided on the rotating shaft bracket 31. The second end of the torsion spring 39 abuts against the moving contact 32 and presses the moving contact 32 into the slot 314. Before the moving contact 32 abuts against the static contact 34, the torsion spring 39 will move The contact 32 is restricted in the slot 314, so that the relative position of the moving contact 32 and the shaft bracket 31 is fixed. After the moving contact 32 abuts against the static contact 34, the shaft bracket 31 continues to rotate, and the moving contact 32 cannot continue to rotate with the shaft bracket 31, causing the torsion spring 39 to be stretched to store energy. When the load circuit is disconnected, the energy stored in the torsion spring 39 is released, so that the moving contact 32 and the static contact 34 are quickly separated. Under the action of the reset member 33, the moving contact 32 and the static contact 34 are further separated, which effectively increases the separation speed of the moving contact 32 and the static contact 34, reduces the generation of arc, and improves safety.

[0038] As an embodiment of the present utility model, the reset member 33 is a tension spring, one end of which is arranged on the housing, and the other end of the tension spring is connected to the rotating shaft bracket 31. When the load circuit is closed, the tension force of the tension spring on the rotating shaft bracket 31 is less than the driving force of the cam assembly on the rotating shaft bracket 31. The tension spring is stretched. When the load circuit is disconnected, the cam assembly releases the driving force on the rotating shaft bracket 31, and the tension spring contracts. Under the tension of the tension spring on the rotating shaft bracket 31, the rotating shaft bracket 31 rotates, thereby realizing the separation of the moving contact 32 and the static contact 34.

[0039] In summary, the present invention provides a load switch cam structure, which applies a driving force to the shaft bracket 31 by the cam assembly to realize and maintain the abutment between the moving contact 32 and the static contact 34, thereby improving the stability of the abutment between the two. When the load circuit is disconnected, the cam assembly releases the driving force on the shaft bracket 31, and under the action of the reset member 33, the moving contact 32 and the static contact 34 can be quickly separated, thereby reducing the generation of arcs and improving safety. The overall structure is simple and the cost is low. Through the structure combined with the gear part 36 and the cam part 37, it is only necessary to control the rotation of the gear part 36 to realize the rotation control of the shaft bracket 31 and the switching of the abutment or separation between the moving contact 32 and the static contact 34. The overall structure is simple and easy to control. The connecting hole 312 and the connecting part 313 are respectively located on both sides of the shaft bracket 31, so that The force of the self-resetting member 33 and the driving force from the cam assembly are opposite forces to each other, and the rotation direction of the rotating shaft bracket 31 is controlled by the magnitude relationship between the two forces, thereby realizing the abutment or separation between the moving contact 32 and the static contact 34. The overall structure is simple and easy to control, which improves practicality; the limit member limits the rotation of the cam assembly to avoid unnecessary damage caused by endless rotation of the cam assembly; the use of a multi-contact structure can effectively reduce the contact resistance between the moving contact 32 and the static contact 34, reduce temperature rise, increase the service life of the moving contact 32 and the static contact 34, and improve the overall safety of use; when the moving contact 32 and the static contact 34 abut, the energy storage component stores a certain amount of energy. When the load circuit is disconnected, the energy stored in the energy storage component is released, which promotes the rapid separation of the moving contact 32 and the static contact 34.

[0040] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A load switch cam structure, arranged in a housing of a load switch, characterized in that: The invention comprises a first rotating shaft (30) arranged on the housing, a rotating shaft bracket (31) arranged on the first rotating shaft (30), a moving contact (32) arranged on the rotating shaft bracket (31), a cam assembly driving the rotating shaft bracket (31) to rotate around the first rotating shaft (30), a reset member (33) limiting the rotation of the rotating shaft bracket (31), and a static contact (34) arranged in the housing; When in the first position, the cam assembly applies a driving force to the rotating shaft bracket (31), and the moving contact (32) abuts against the static contact (34); In the second position, the cam assembly releases the driving force on the rotating shaft bracket (31), and the moving contact (32) is separated from the static contact (34).

2. The load switch cam structure according to claim 1, characterized in that: The cam assembly comprises a second rotating shaft (35) arranged in the housing, a gear portion (36) arranged on the second rotating shaft (35), and a cam portion (37) arranged on the gear portion (36). When in the first position, the cam portion (37) abuts against the rotating shaft bracket (31) and applies a driving force to the rotating shaft bracket (31).

3. The load switch cam structure according to claim 1, characterized in that: The rotating shaft bracket (31) includes a body (311) that rotates around the first rotating shaft (30). The body (311) is provided with a connecting hole (312) and a connecting portion (313). The connecting hole (312) is used to be connected to the reset member (33). When in the first position, the connecting portion (313) abuts against the cam assembly and bears the driving force from the cam assembly.

4. The load switch cam structure according to claim 1, characterized in that: It also includes a limiting member, which limits the rotation of the cam assembly.

5. The load switch cam structure according to claim 4, characterized in that: The limiting member is a micro switch (38) arranged on the housing, and the cam assembly rotates to press or release the micro switch (38).

6. The load switch cam structure according to claim 1, characterized in that: There are a plurality of movable contacts (32) and a plurality of stationary contacts (34), and the number of the movable contacts (32) and the stationary contacts (34) are the same and correspond one to one.

7. The load switch cam structure according to claim 1, characterized in that: An energy storage component is provided between the moving contact (32) and the rotating shaft bracket (31).

8. The load switch cam structure according to claim 7, characterized in that: The energy storage component is a torsion spring (39).

9. The load switch cam structure according to claim 8, characterized in that: A slot (314) is provided on the rotating shaft bracket (31), a first end of the torsion spring (39) is arranged on the rotating shaft bracket (31), and a second end of the torsion spring (39) abuts against the moving contact (32) and presses the moving contact (32) into the slot (314).

10. The load switch cam structure according to claim 1, characterized in that: The reset member (33) is a tension spring, one end of which is arranged on the housing, and the other end of which is connected to the rotating shaft bracket (31).

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