A switch

Abstract

A kind of switch belongs to switch electric appliance technical field.It includes base, arc extinguishing chamber being installed in base and dynamic contact assembly being rotatably arranged on base, the dynamic contact assembly includes dynamic contact, it is characterized by: it further includes blocking piece, the blocking piece is fixedly connected with the dynamic contact, wherein the blocking piece includes arc baffle, and side plate is arranged on both sides of arc baffle;In the base and below dynamic contact, boss is equipped, the boss both sides are provided with slot, and the side plate is matched with the slot.Optical advantage: because the blocking piece of fixed connection with dynamic contact is additionally arranged in the position between rotating shaft and dynamic contact point and is inserted with the slot of base, thus it can prevent high temperature free gas and metal particles generated when dynamic contact and static contact break apart from the gap between the lower end of dynamic contact rotating shaft and base reverse flow, guarantee the reliable insulation between dynamic contact, static contact and operating mechanism and improve breaking performance and service life.

Description

Technical Field

[0001] This utility model belongs to the field of switch and electrical appliance technology, and specifically relates to a switch. Background Technology

[0002] Existing switches, such as molded case circuit breakers (MCCBs), are protective devices used in power distribution systems. They have overload protection functions, such as when the current in the circuit exceeds the rated value but does not reach the level of short-circuit current, the MCCB trips after a delay due to the thermal effect of the bimetallic strip, preventing the line from overheating and causing a fire. They also have short-circuit protection functions, such as when a short-circuit fault occurs (the current suddenly rises to several times the rated value), the electromagnetic trip unit operates instantaneously (usually on the order of milliseconds) to cut off the fault current and prevent equipment damage and arcing accidents. As an optional undervoltage / shunt trip function, it actively disconnects the circuit when the voltage is abnormal, protecting sensitive equipment.

[0003] With the development of new energy in my country, more stringent requirements have been placed on the insulation of switches. Ensuring reliable insulation between the moving contact, stationary contact, and operating mechanism when the switch breaks a short circuit is the most important factor.

[0004] There is an electrodynamic repulsion (repulsive force between conductors with opposite current) between the moving and stationary contacts of a switch. The magnitude of this repulsion is proportional to the magnitude of the current flowing through the contact. When a short-circuit current flows through the contact, the resulting electrodynamic repulsion can cause the moving contact to be repelled and separated from the stationary contact before the switch's operating mechanism actuates. When the moving and stationary contacts separate, an electric arc is generated. Under normal circumstances, the arc is extinguished by entering the arc-extinguishing chamber along the arc-starting angle under the influence of the magnetic field and the gas field. However, after the switch's operating mechanism is activated and unlocked, a gap forms between the lower end of the moving contact's shaft and the housing. Due to the flow of gas, the electric arc may not flow completely to the arc-extinguishing grid of the arc-extinguishing chamber's structural system and be cut into short arcs until extinguished. Instead, it flows out in the opposite direction from the gap between the lower end of the moving contact's shaft and the housing (which may become a low-resistance channel for high-speed airflow during high-speed opening). This causes high-temperature ionized gas to flow towards the metal support of the moving contact and the operating mechanism bracket, easily causing the metal support to burn out and short-circuit with the operating mechanism bracket, resulting in reduced switch breaking performance and service life. Utility Model Content

[0005] The objective of this invention is to provide a switch that helps prevent high-temperature ionized gas and metal particles generated during the separation of the moving and stationary contacts from flowing out in the reverse direction from the gap between the lower end of the moving contact shaft and the housing, thereby ensuring reliable insulation between the moving and stationary contacts and the operating mechanism, and improving breaking performance and service life.

[0006] The present invention accomplishes its objective as follows: a switch includes a base, an arc-extinguishing chamber installed within the base, and a moving contact assembly rotatably mounted on the base. The moving contact assembly includes a moving contact. The switch further includes a blocking member, which is fixedly connected to the moving contact. The blocking member includes an arc-blocking plate with side plates on both sides. A boss is provided within the base and below the moving contact, with slots on both sides of the boss, and the side plates engage with the slots.

[0007] Furthermore, the moving contact assembly also includes a rotating shaft and a moving contact, and the blocking member is disposed between the rotating shaft and the moving contact.

[0008] Furthermore, the boss has an arc surface facing the direction of the rotating shaft. This arc surface is correspondingly provided with the arc-blocking plate, and the center of the arc surface is concentric with the center of the arc-blocking plate and the rotation center of the rotating shaft.

[0009] Furthermore, a U-shaped plate is provided at one end of the blocking member to cooperate with the moving contact. The U-shaped plate wraps around the moving contact and extends toward the moving contact point on the moving contact assembly. The other end of the blocking member is bent toward the axis of rotation to form a baffle plate of the blocking member. The baffle plate extends downward toward the axis of rotation.

[0010] Furthermore, the side plate is inserted into the slot, and the blocking member slides within the slot due to the rotation of the moving contact assembly.

[0011] Furthermore, a through hole is provided on the moving contact and near the moving contact point, and a connecting hole is provided on the U-shaped plate of the blocking member at a position corresponding to the through hole. The blocking member is fixed on the moving contact by fasteners at positions corresponding to the through hole and the connecting hole.

[0012] Furthermore, a limiting boss is provided on one side of the moving contact and at a position away from the moving contact point, and a limiting hole is provided on the U-shaped plate of the blocking member at a position corresponding to the limiting boss. The blocking member is limited on the moving contact by the cooperation of the limiting boss and the limiting hole.

[0013] Furthermore, the blocking element is made of insulating material.

[0014] Furthermore, the insulating material is reinforced flame-retardant nylon.

[0015] The technical effect of the solution provided by this utility model is as follows: because a blocking component that is slotted and plugged into the base and fixedly connected to the moving contact is added between the rotating shaft and the moving contact, it can prevent the high-temperature free gas and metal particles generated when the moving contact and the stationary contact are separated from flowing out in the opposite direction from the gap between the lower end of the moving contact rotating shaft and the base, thus ensuring reliable insulation between the moving contact, the stationary contact and the operating mechanism and improving the breaking performance and service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall assembly of this utility model;

[0017] Figure 2 for Figure 1 A sectional view;

[0018] Figure 3 This is a schematic diagram of the assembly structure of the insulating component and the base of this utility model;

[0019] Figure 4 This is a schematic diagram of the assembly structure of the moving contact and the insulating component of this utility model;

[0020] Figure 5 This is an exploded view of the assembly structure of the moving contact and insulating component of this utility model;

[0021] Figure 6 This is a schematic diagram of the base structure of this utility model;

[0022] Figure 7 This is a schematic diagram of the insulating component structure of this utility model. Detailed Implementation

[0023] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this invention should be considered within the scope of protection of this invention.

[0024] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0025] Please see Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7The switch includes a base 1, an arc-extinguishing chamber 2 installed within the base 1, and a moving contact assembly 3 rotatably disposed within the base 1. A sidewall 11 with an opening 12 is provided within the base 1 to enclose the mounting positions of the arc-extinguishing chamber 2 and the moving contact assembly 3. The arc-extinguishing chamber 2 has an inlet 21 communicating with the opening 12. The moving contact assembly 3 includes a moving contact 31 rotatably disposed on the base 1, with one end of the moving contact 31 extending into the arc-extinguishing chamber 2 through the opening 12 and the inlet 21. The switch also includes a blocking member 4. Component 4 is fixedly connected to the moving contact 31; wherein, the blocking component 4 includes an arc-blocking plate 41, which is an arc-shaped plate bent towards the direction of the rotating shaft 32 and extending downward towards the rotating shaft 32. The center of the arc-shaped plate is concentric with the rotation center of the rotating shaft 32, and the arc-blocking plate 41 blocks most of the rotating shaft 32. Arc-shaped side plates 42 are provided on both sides of the arc-blocking plate 41 away from the rotation center of the rotating shaft 32. A boss 13 is provided in the base 1 and below the moving contact 31. The boss 13 has slots 14 on both sides that are adapted to the side plates 42, and the side plates 42 cooperate with the slots 14. An arc surface 131 is formed on the boss 13 facing the direction of the rotating shaft 32. The arc surface 131 is correspondingly provided with the arc-blocking plate 41, and the center of the arc surface 131 is concentric with the center of the arc-blocking plate 41 and the rotation center of the rotating shaft 32.

[0026] The aforementioned mounting location can also be understood as an installation area or installation position; that is, the side wall 11 is used to enclose the installation area or installation position of the arc-extinguishing chamber 2 and the moving contact assembly 3. Figure 6 As shown, the base 1 has a first mounting position (arc-extinguishing chamber mounting position) for mounting the arc-extinguishing chamber 2, and a second mounting position (moving contact assembly mounting position) for mounting the moving contact assembly 3. As a non-limiting embodiment, this invention shows two of each of the aforementioned first and second mounting positions (the number of first and second mounting positions is the same) constructed within the base 1. The aforementioned sidewall 11 with the opening 12 is used to enclose the first mounting position. Figure 2 As shown, the arc-extinguishing chamber 2 is the location where the moving contact 31 and the stationary contact 6 make contact and engage, and it is also the location where an electric arc is generated and extinguished when the moving contact 31 and the stationary contact 6 break. In this embodiment, which is one example, the arc-extinguishing chamber 2 includes two oppositely arranged insulating gas-generating elements 22 ( Figure 1As shown in the figure, the two insulating gas generating components 22 can be independent of each other or connected to each other; there is a gap between the two insulating gas generating components 22 to form at least a part of the arc-extinguishing chamber 2. The inlet 21 of the arc-extinguishing chamber 2 is formed on one side of the two insulating gas generating components, and the outlet of the arc-extinguishing chamber 2 (not shown in the figure) is formed on the other side of the two insulating gas generating components 22. The inlet 21 corresponds to the outlet, and several arc-extinguishing grids for extinguishing and cooling the arc are also provided at the outlet. Among them, the inlet 21 of the arc-extinguishing chamber 21 corresponds to and is connected to the opening 12, and the opening direction of the inlet 21 of the arc-extinguishing chamber 2 is the same as the opening direction of the opening 12.

[0027] Further, please see Figure 4 The moving contact assembly 3 also includes a rotating shaft 32 and a moving contact 33, and the blocking member 4 is disposed between the rotating shaft 32 and the moving contact 33.

[0028] Furthermore, the aforementioned arc surface 131 is formed on the boss 13 facing the rotating shaft 32. The arc surface 131 is correspondingly provided with the arc baffle 41, and the center of the arc surface 131 is concentric with the center of the arc baffle 41 and the rotation center of the rotating shaft 32.

[0029] Further, please see Figure 4 and Figure 5 And combined Figure 7 A U-shaped plate 43 is provided at one end of the blocking member 4 to cooperate with the moving contact 31. The U-shaped plate 43 wraps around the moving contact 31 and extends toward the moving contact point 33 on the moving contact assembly 3. The other end of the blocking member 4 is bent toward the rotating shaft 32 to form the arc-blocking plate 41 of the blocking member 4. The arc-blocking plate 41 extends downward toward the rotating shaft 32.

[0030] Furthermore, the aforementioned blocking element 4 is connected via side plate 42 ( Figure 3 (See diagram) It is inserted into the aforementioned slot 14, and is driven to slide within the slot 14 by the rotation of the aforementioned moving contact assembly 3.

[0031] Furthermore, and by Figure 5 As shown, a through hole 34 is provided on the aforementioned moving contact 31 and near the aforementioned moving contact 33. A connecting hole 44 is provided on the U-shaped plate 43 of the aforementioned blocking member 4 at a position corresponding to the through hole 34. The blocking member 4 is fixed to the aforementioned moving contact 31 by the fastener 7 at positions corresponding to the through hole 34 and the connecting hole 44.

[0032] Furthermore, a limiting boss 35 is provided on one side of the aforementioned moving contact 31 and at a position away from the moving contact 33, and a limiting hole 45 is provided on the aforementioned U-shaped plate 43 of the aforementioned blocking member 4 at a position corresponding to the limiting boss 35. The aforementioned blocking member 4 is limited on the moving contact 31 by the cooperation of the aforementioned limiting boss 35 and the limiting hole 45.

[0033] Furthermore, in this embodiment, the aforementioned fastener 7 is composed of... Figure 4 The rivet shown.

[0034] Depend on Figure 2 As shown, in the aforementioned circuit breaker structure, the stationary contact 6, corresponding to the moving contact 31, is fixed on the base 1, and at least a portion of the stationary contact 6 is located within the arc-extinguishing chamber 2. One end of the moving contact 31 is rotatably connected to the base 1, and the other end of the moving contact 31 extends into the arc-extinguishing chamber 2 through the opening 12 and the inlet 21 of the arc-extinguishing chamber 2. Thus, as the moving contact 31 rotates, it can move closer to or further away from the stationary contact 6, thereby realizing the conduction and disconnection of the moving contact 31 and the stationary contact 6, and thus realizing the conduction and disconnection of the circuit breaker. Since the isolating member 4 is fixedly connected to the moving contact 31, it can rotate synchronously with the moving contact 31. Furthermore, since the isolating member 4 is configured to cooperate with the slot 14 on the base 1, it can block the gap between the aforementioned opening 12 and the boss 13.

[0035] exist Figure 2 The diagram shows an operating mechanism 5 mounted on a base 1. This operating mechanism 5 is actuated by an external actuator to move the moving contact 31 in the contact assembly 3 so as to disconnect or connect it with the stationary contact 6.

[0036] Therefore, in the circuit breaker provided in this application embodiment, when the high-temperature ionized gas and metal particles generated when the moving contact 31 and the stationary contact 6 break flow out in the opposite direction toward the inlet 21 and opening 12 of the arc-extinguishing chamber 2, the arc-blocking plate 41 on the insulating member 4 can block the high-temperature gas and metal particles on one side of the opening 12. At the same time, the cooperation between the side plate 42 and the slot 14 can block the gap between the opening 12 and the boss 13. Thus, the high-temperature ionized gas and metal particles are prevented from flowing toward the metal support and the shaft in the contact assembly 3, thereby avoiding the burning of the metal support and the jamming of the shaft, improving the switching performance of the product, and extending the service life of the product.

[0037] In this embodiment, the aforementioned blocking member 4 is made of an insulating material; the aforementioned insulating material is reinforced flame-retardant nylon.

[0038] In summary, the switch provided by this utility model can prevent high-temperature ionized gas and metal particles from flowing out in reverse, prevent the metal support from burning and the shaft from jamming, increase the reliable insulation between the moving contact, stationary contact and the mechanism, and improve the switching performance and service life of the product. Therefore, the invention objective has been achieved and the invention task has been completed.

Claims

1. A switch comprising a base (1), an arc-extinguishing chamber (2) mounted within the base (1), and a moving contact assembly (3) rotatably disposed on the base (1), the moving contact assembly (3) comprising a moving contact (31), characterized in that: It also includes a blocking member (4), which is fixedly connected to the moving contact (31). The blocking member (4) includes an arc-blocking plate (41) and side plates (42) on both sides of the arc-blocking plate (41). A boss (13) is provided in the base (1) and below the moving contact (31). A slot (14) is provided on both sides of the boss (13), and the side plates (42) cooperate with the slots (14).

2. A switch according to claim 1, characterized in that: The moving contact assembly (3) also includes a rotating shaft (32) and a moving contact (33), and the blocking member (4) is disposed between the rotating shaft (32) and the moving contact (33).

3. A switch according to claim 2, characterized in that: The boss (13) has an arc surface (131) facing the rotating shaft (32). The arc surface (131) is correspondingly provided with the arc-blocking plate (41), and the center of the arc surface (131) is concentric with the center of the arc-blocking plate (41) and the rotation center of the rotating shaft (32).

4. A switch according to claim 1, characterized in that: A U-shaped plate (43) is provided at one end of the blocking member (4) to cooperate with the moving contact (31). The U-shaped plate (43) wraps around the moving contact (31) and extends toward the moving contact point (33) on the moving contact assembly (3). The other end of the blocking member (4) is bent toward the rotating shaft (32) to form the arc-blocking plate (41) of the blocking member (4). The arc-blocking plate (41) extends downward toward the rotating shaft (32).

5. A switch according to claim 1, characterized in that: The side plate (42) is inserted into the slot (14), and the blocking member (4) is driven to slide in the slot (14) by the rotation of the moving contact assembly (3).

6. A switch according to claim 4, characterized in that: A through hole (34) is provided on the moving contact (31) and near the moving contact (33). A connecting hole (44) is provided on the U-shaped plate (43) of the blocking member (4) at a position corresponding to the through hole (34). The blocking member (4) is fixed on the moving contact (31) by a fastener (7) at a position corresponding to the through hole (34) and the connecting hole (44).

7. A switch according to claim 4, characterized in that: A limiting boss (35) is provided on one side of the moving contact (31) and away from the moving contact (33). A limiting hole (45) is provided on the U-shaped plate (43) of the blocking member (4) at a position corresponding to the limiting boss (35). The blocking member (4) is limited to the moving contact (31) by the cooperation of the limiting boss (35) and the limiting hole (45).

8. A switch according to any one of claims 1 to 7, characterized in that: The blocking element (4) is made of insulating material.

9. A switch according to claim 8, characterized in that: The insulating material is reinforced flame-retardant nylon.

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