Miniature isolating switch with arc extinguishing function

Abstract

The utility model discloses a miniature disconnecting switch with an arc extinguishing function, which relates to the field of switches and comprises a shell, a moving contact and a static contact are arranged in the shell, and the end part of the static contact is bent. The utility model has the effect of prolonging the service life of the small isolating switch.

Description

Technical Field

[0001] The present application relates to the field of switches, and in particular to a small isolating switch with an arc extinguishing function. Background Art

[0002] An isolating switch is a device mainly used for "isolating power supply, switching operation, and connecting and disconnecting low current circuits".

[0003] The patent with publication number CN218385046U discloses a circuit breaker, including a shell and at least one circuit breaker pole arranged in the shell, each circuit breaker pole includes at least one-phase main line, a first wiring port is provided on the side wall of the shell, at least one-phase main line is connected to a lead-out conductive member, and the lead-out conductive member is provided with a plug-in portion; the plug-in portion has a slot therein and is arranged opposite to the first wiring port, and / or at least one of the plug-in portions extends out of the shell through the first wiring port. The utility model has a lead-out conductive member with a plug-in portion connected to the main line, so that the accessory module of the circuit breaker is inserted into the plug-in portion for plug-in cooperation, or the plug-in portion extends out of the shell for plug-in cooperation with the accessory module of the circuit breaker, which is beneficial to the plug-in assembly of the accessory module of the circuit breaker and the circuit breaker, so as to replace the prior art of connecting the accessory module of the circuit breaker and the circuit breaker through wires, and is beneficial to the realization of the automatic assembly of the accessory module of the circuit breaker and the circuit breaker, which conforms to the relevant technology of modular development of circuit breakers.

[0004] In the process of implementing the above application, the inventors found that there are at least the following problems in this technology: the above circuit breaker does not introduce an arc extinguishing system, the load operation breaking index and life are low, it is not suitable for frequent load operation, and it is also unable to break larger currents. For example, when breaking a current of more than 20 times the rated current, the contacts may burn out and can no longer be used. Utility Model Content

[0005] In order to increase the service life of a small isolating switch, the present application provides a small isolating switch with an arc extinguishing function.

[0006] The present application provides a small isolating switch with arc extinguishing function adopts the following technical solution:

[0007] A small isolating switch with arc extinguishing function comprises a shell, wherein a moving contact and a stationary contact are arranged in the shell, the end of the stationary contact is arranged in a bent state, and a separation spring for pulling the moving contact away from the stationary contact is fixed inside the shell.

[0008] By adopting the above technical solution, the end of the static contact is bent, like a coil, and the magnetic field generated by its current generates an enhanced magnetic field between the arcs, and the magnetic field strength is proportional to the current. The arc is affected by the magnetic field and blown outward by the magnetic force, thereby lengthening the arc length. At the same time, when the arc is blown to the arc extinguishing grid, the arc is cut off, achieving the purpose of rapid arc extinguishing, thereby improving the current breaking capacity; when the moving contact is separated from the static contact, the moving contact and the static contact can be quickly separated under the action of the separation spring.

[0009] Optionally, the end of the stationary contact and the end of the moving contact are both fixed with contacts, and the end of the stationary contact where the contact is fixed is bent.

[0010] By adopting the above technical solution, the moving contact moves toward the stationary contact, so that the contact point on the moving contact contacts the contact point on the stationary contact, thereby connecting the stationary contact with the moving contact, which facilitates the line connection process.

[0011] Optionally, the moving contact is rotatably arranged inside the shell.

[0012] By adopting the above technical solution, the moving contact can rotate, and the moving contact rotates to contact the static contact, which facilitates the line connection process.

[0013] Optionally, a handle is rotatably provided on the housing, and a driving part is provided between the handle and the moving contact, and two ends of the driving part are rotatably provided on the handle and the moving contact respectively.

[0014] By adopting the above technical solution, the handle extends to the outside of the shell, and the handle is rotated. Since the two ends of the driving part are respectively rotatably arranged on the handle and the moving contact, the driving part rotates during the process of rotating the handle, thereby driving the moving contact to move.

[0015] Optionally, an auxiliary switch for facilitating the operation of the handle is rotatably arranged inside the shell, and a limit block for limiting the position of the auxiliary switch is fixed inside the shell.

[0016] By adopting the above technical solution, the auxiliary switch provides power to the handle during the rotation of the handle, and the limit block is used to limit the position of the auxiliary switch, thereby reducing the possibility of the auxiliary switch position being offset.

[0017] Optionally, a contact rod for contacting an auxiliary switch is fixed on the handle.

[0018] By adopting the above technical solution, a contact rod is fixed on the handle, which facilitates the handle to contact the auxiliary switch during the rotation process.

[0019] Optionally, a reset torsion spring for driving the auxiliary switch to reset is fixed inside the housing.

[0020] By adopting the above technical solution, the reset torsion spring is used to drive the auxiliary switch to reset, so that the auxiliary switch can return to its original position after rotation.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The end of the static contact is bent, like a coil. The magnetic field generated by the current generates a reinforced magnetic field between the arcs. The magnetic field strength is proportional to the current. The arc is affected by the magnetic field and blown outward by the magnetic force, lengthening the arc length. At the same time, when the arc is blown to the arc extinguishing grid, the arc is cut off, achieving the purpose of rapid arc extinguishing, thereby improving the breaking current capacity;

[0023] 2. The moving contact moves toward the stationary contact, so that the contact point on the moving contact contacts the contact point on the stationary contact, thereby connecting the stationary contact and the moving contact, facilitating the line connection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present application.

[0025] Figure 2 It is a schematic diagram of the separation state of the moving contact and the static contact.

[0026] Figure 3 It is a schematic diagram of the contact state between the moving contact and the static contact.

[0027] Description of reference numerals:

[0028] 1. Housing; 2. Moving contact; 3. Static contact; 4. Contact; 5. Driving part; 6. Separation spring; 7. Auxiliary switch; 8. Limit block; 9. Contact rod; 10. Reset torsion spring; 11. Handle; 12. Arc extinguishing grid; 13. Connection frame; 14. Connection bolt; 15. Rotation shaft; 16. Rotation slot. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-3 This application is described in further detail.

[0030] The embodiment of the present application discloses a small isolating switch with arc extinguishing function. Figure 1 , Figure 2 and Figure 3The small isolating switch with arc extinguishing function comprises a housing 1, wherein the housing 1 is provided with components for controlling the circuit; a moving contact 2 and a stationary contact 3 are provided in the housing 1, wherein the moving contact 2 and the stationary contact 3 can contact each other, and the moving contact 2 and the stationary contact 3 are both connected to the outside of the housing 1, and the external circuit of the housing 1 can be connected, the moving contact 2 can rotate inside the housing 1, and the stationary contact 3 is stationary inside the housing 1, and the ends of the moving contact 2 and the stationary contact 3 are fixed with contacts 4 by means of a clamping connection, and the contact 4 is made of a silver alloy or other materials, and the contact 4 on the moving contact 2 contacts the contact 4 on the stationary contact 3, so that the moving contact 2 is connected with the stationary contact 3, and the end of the stationary contact 3 fixed with the contact 4 is bent. That is, the end of the static contact 3 is bent, which is specifically U-shaped, and can also be C-shaped. An arc-extinguishing grid 12 is fixed inside the shell 1 by an integrated molding method. The static contact 3 is U-shaped, like a coil. The magnetic field generated by its current generates an enhanced magnetic field between the arcs, and its magnetic field strength is proportional to the current. The arc is affected by the magnetic field and blown outward by the magnetic force, which lengthens the arc length. At the same time, when the arc is blown to the arc-extinguishing grid 12, the arc is cut off, achieving the purpose of rapid arc extinguishing, thereby improving the breaking current capacity; due to the action of the electromagnetic force, the arc is generated at the copper edge leaving the contact 4, which effectively protects the contact 4 from being burned, greatly prolongs the life of the contact 4, and thus greatly prolongs the operating electrical life of the switch.

[0031] Reference Figure 1 , Figure 2 and Figure 3A handle 11 is rotatably provided on the shell 1 through a rotating shaft, and the handle 11 extends to the outside of the shell 1, so as to facilitate the rotation of the control handle 11. A driving part 5 is provided between the handle 11 and the moving contact 2. The driving part 5 can be in the shape of a plate or a rod. In this embodiment, the driving part 5 is in the shape of a rod, and it is C-shaped, including a main rod and side rods integrally formed at both ends of the main rod. The two side rods are rotatably provided on the handle 11 and the side walls of the moving contact 2, that is, the two ends of the driving part 5 are rotatably provided on the handle 11 and the moving contact 2, respectively. When the handle 11 is pushed forward, the handle 11 rotates clockwise, and the moving contact 2 is driven to rotate clockwise through the connecting rod. During the rotation process, the contact 4 of the moving contact 2 gradually moves toward the contact 4 of the static contact 3. The material of the contact 4 is a silver alloy or other materials. The closing process has a characteristic that the movement speed of the moving contact 2 is in a deceleration state relative to the movement speed of the handle 11. Especially when the moving and static contacts 3 generate contact pressure, the relative speed ratio is very small. The purpose is to greatly reduce the operating force of the handle 11. When the axis of the upper elbow of the connecting rod is in a straight line with the axis of the operating handle 11 and the center of the axis of the two side rods of the driving part, that is, the dead point position, the contact pressure is maximum and continues to move. The axis of the side rod of the driving part changes from the right side of the straight line connected by the operating handle 11 and the lower elbow of the connecting rod to the left side, and the horizontal force of the moving contact 2 component changes from left to right. At the same time, the tail of the moving contact 2 moves down and the bottom of the slot is no longer pressed against the limiting shaft. The contact overtravel is related to the distance it leaves. Since the shafts and sleeves of the relevant moving parts are clearance fit, they slide slightly to the left to remove surface oxides and surface unevenness caused by the arc, achieve the purpose of self-repair, and ensure good contact.

[0032] Reference Figure 1 , Figure 2 and Figure 3 A separation spring 6 is provided inside the shell 1, one end of the separation spring 6 is clamped inside the shell 1, and the other end is clamped on the side wall of the moving contact 2, and the separation spring 6 is used to pull the moving contact 2 to move in a direction away from the static contact 3. After turning the handle 11, the moving contact 2 and the static contact 3 tend to separate. Under the action of the separation spring 6, the moving contact 2 and the static contact 3 can be separated more quickly.

[0033] Reference Figure 1 , Figure 2 and Figure 3An auxiliary switch 7 is arranged inside the housing 1 through the rotation of the rotating shaft. The auxiliary switch 7 facilitates the rotation of the operating handle 11. A limit block 8 is fixed inside the housing 1 by an integral molding method. The limit block 8 is used to limit the position of the auxiliary switch 7, thereby reducing the possibility of position deviation of the auxiliary switch 7; a reset torsion spring 10 is arranged inside the housing 1, and the reset torsion spring 10 is used to drive the auxiliary switch 7 to reset so that the auxiliary switch 7 can return to its original position after rotation. A contact rod 9 is fixed on the handle 11 by an integral molding method. When the handle 11 rotates, the contact rod 9 is driven to move, and the contact rod 9 contacts the auxiliary switch 7, thereby pushing the auxiliary switch 7. When the handle 11 is reset, under the action of the reset torsion spring 10, the auxiliary switch 7 pushes the contact rod 9 to move, thereby driving the handle 11 to rotate, which is convenient for resetting the handle 11.

[0034] Reference Figure 1 , Figure 2 and Figure 3 A connecting frame 13 is fixed inside the shell 1, and a connecting bolt 14 is slidably provided on the shell 1, and the connecting bolt 14 is threadedly connected to the connecting frame 13, which is convenient for connecting the shell 1 with the external circuit. The moving contact 2 and the static contact 3 are connected to the connecting frame 13. A rotating shaft 15 is fixed inside the shell 1, and a rotating groove 16 is opened on the moving contact 2. The rotating shaft 15 is penetrated in the rotating groove 16, and the length of the rotating groove 16 is greater than the diameter of the rotating shaft 15, which is convenient for the rotation process of the moving contact 2. The circular hole in the middle of the moving contact 2 penetrates the side rod of the driving part 5 to become the fulcrum of the seesaw structure of the moving contact 2. After the moving contact 2 contacts the static contact 3, due to the downward pressure of the fulcrum and the tension of the spring, the tail of the moving contact 2 will move downward, and the contact overtravel is related to the distance of the one-way groove at the tail.

[0035] The implementation principle of a small isolating switch with an arc extinguishing function in an embodiment of the present application is as follows: turning the handle 11 drives the moving contact 2 to contact the static contact 3, thereby connecting the external line. When the switch is in the closed position, the operating handle 11 moves in the opening direction, and the mechanism first passes the dead point. When it continues to move, the moving contact 2 is accelerated to separate due to the spring tension, and then the moving contact 2 quickly leaves the static contact 3. The static contact 3 is U-shaped, like a coil. The magnetic field generated by its current generates an enhanced magnetic field between the arcs, and the magnetic field strength is proportional to the current. The arc is affected by the magnetic field and blown outward by the magnetic force, which lengthens the arc length. At the same time, when the arc is blown to the arc extinguishing grid 12, the arc is cut off, achieving the purpose of rapid arc extinguishing, thereby improving the current breaking capacity. Due to the effect of electromagnetic force, the arc is generated at the copper edge leaving the contact 4, which effectively protects the contact 4 from being burned, greatly prolongs the life of the contact 4, and thus greatly prolongs the operating life of the switch; in addition, the operating force of a general small isolating switch is much greater than that of an ordinary small circuit breaker, which is obviously not ideal; most of them adopt a main spring and contact spring structure, and the operating resistance of the handle 11 is generated by the main spring, which is usually a torsion spring. The force generated by the main spring must be greater than the reaction force of the contact spring, resulting in a very large operating force of the handle 11; in this application, the main structure is only provided with one spring, which is a spring for generating the contact pressure of the contact system, and is also an automatic return spring for the separation and closing of the operating handle 11, thereby reducing the operating force of the handle 11; in addition In addition, in general small isolating switches, the moving contact 2 and the static contact 3 are in direct-acting contact, and there is no sliding friction between them to remove the oxide layer on the contact surface or self-friction leveling effect, which easily increases the contact resistance and heats up; when the switch is open and closed with load or withstands short-circuit current, the moving and static contacts 3 will gradually burn and become thinner, and the compression of the direct-acting contact spring is significantly reduced, that is, the contact pressure is significantly reduced, which eventually leads to the increase of contact resistance and heats up and cannot be used normally. The closing process of this structure has a characteristic that the movement speed of the moving contact 2 is in a deceleration state relative to the movement speed of the handle 11, especially when the moving contact 2 and the static contact 3 generate contact pressure, the relative speed ratio is very small, and its purpose is to greatly reduce the operating force of the handle 11. At the same time, the contact overtravel is related to the distance it leaves. The contact surface of the moving and static contacts 3, because the shafts and sleeves of the relevant moving parts are clearance-matched, slide slightly to the left to remove the surface oxides and the surface unevenness caused by the arc, achieve the purpose of self-repair, and ensure good contact.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A small isolating switch with arc extinguishing function, comprising a housing (1), characterized in that: A moving contact (2) and a stationary contact (3) are arranged in the housing (1); the end of the stationary contact (3) is arranged in a bent state; and a separation spring (6) for pulling the moving contact (2) away from the stationary contact (3) is fixed inside the housing (1).

2. The small isolating switch with arc extinguishing function according to claim 1 is characterized in that: The ends of the stationary contact (3) and the moving contact (2) are both fixed with contacts (4), and the ends of the stationary contact (3) to which the contacts (4) are fixed are arranged in a bent manner.

3. The small isolating switch with arc extinguishing function according to claim 1 is characterized in that: The moving contact (2) is rotatably arranged inside the housing (1).

4. The small isolating switch with arc extinguishing function according to claim 1 is characterized in that: A handle (11) is rotatably arranged on the housing (1), and a driving part (5) is arranged between the handle (11) and the moving contact (2), with two ends of the driving part (5) being rotatably arranged on the handle (11) and the moving contact (2) respectively.

5. The small isolating switch with arc extinguishing function according to claim 1 is characterized in that: An auxiliary switch (7) for facilitating the operation of a handle (11) is rotatably arranged inside the housing (1), and a limit block (8) for limiting the position of the auxiliary switch (7) is fixed inside the housing (1).

6. The small isolating switch with arc extinguishing function according to claim 5 is characterized in that: A contact rod (9) for contacting the auxiliary switch (7) is fixed on the handle (11).

7. The small isolating switch with arc extinguishing function according to claim 6 is characterized in that: A reset torsion spring (10) for driving the auxiliary switch (7) to reset is fixed inside the housing (1).

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