Air-blowing tripping mechanism and molded case circuit breaker
An air-blowing tripping mechanism that is driven by gas, and includes a housing having a sealing cavity with an air-blowing channel blocked by an insulating partition plate that is blown by the gas to move, whereby the gas enters the sealing cavity, and a push rod rotationally connected to the housing. The push rod includes a rotating arm rotationally connected aside of the sealing cavity, and a reset arm. One end of the rotating arm has an operating portion opposite to an operating mechanism of a circuit breaker, and the other end of the rotating arm has an air-blowing end that extends into the sealing cavity, is located on one side of the insulating partition plate and can drive the rotating arm to rotate under the action of the gas. The reset arm is on the rotating arm and used for driving the push rod to reset.
1 . An air-blowing tripping mechanism, comprising a housing and a push rod rotationally connected to the housing, the housing is provided with a sealing cavity provided with an air-blowing channel, the air-blowing channel is blocked by an insulating partition plate, and a gas is able to blow the insulating partition plate to move, so as to enter into the sealing cavity; wherein the push rod comprises a rotating arm and a reset arm which are integrally arranged; the rotating arm is rotationally connected and a rotational joint of the rotating arm is on one side of the sealing cavity; a rotating center which is rotatably connected to the housing is provided in a middle of the rotating arm, one end of the rotating arm is provided with an operating portion opposite to an operating mechanism of a circuit breaker, and another end of the rotating arm is provided with an air-blowing end; the air-blowing end extends into the sealing cavity, is located on one side of the insulating partition plate and can drive the rotating arm to rotate under an action of the gas; and the reset arm, which is elastic, is disposed on one side of the rotating arm and used for driving the push rod to reset;
an opening through which the air-blowing end extends is formed on one side of the sealing cavity; the air-blowing end extends into the sealing cavity through the opening; a sealing portion is disposed between the rotating center and the air-blowing end, a sealing protrusion is disposed at the opening, a matching groove is correspondingly formed in a sidewall between the sealing portion and the air-blowing end;
and during a swing course of the push rod, the matching groove is in sliding fit with the sealing protrusion, the sealing portion blocks the opening to keep the sealing cavity in a sealed state; a length of an arc-shaped surface of the sealing portion that blocks the opening is greater than an opening length of the opening, and during the swing course of the push rod, the sealing portion always blocks the opening, or always blocks a side of the opening close to the air-blowing channel.
2 . The air-blowing tripping mechanism according to claim 1 , wherein one end of the reset arm is connected to the rotating arm; a gap is reserved between the reset arm and the rotating arm; a clamping portion is disposed at another end of the reset arm; and the clamping portion props within a clamping groove formed on the housing.
3 . The air-blowing tripping mechanism according to claim 1 , wherein the reset arm is provided with a plurality of curved arc-shaped portions.
4 . The air-blowing tripping mechanism according to claim 1 , wherein two air-blowing channels are respectively provided on both sides of the sealing cavity; one end of each of the two air-blowing channels is communicated with an arc extinguishing system of an adjacent circuit breaker pole, and another end of each of the two air-blowing channels serves as a second air-blowing port and is blocked by an insulating partition plate; the insulating partition plate is of U-shaped and disposed in the sealing cavity; and the insulating partition plate comprises a connecting wall and a pair of elastic walls, wherein the connecting wall is fixed in the sealing cavity, one end of each elastic wall is connected to one side of the connecting wall, and the pair of elastic walls block the second air-blowing ports of the two air-blowing channels respectively.
5 . The air-blowing tripping mechanism according to claim 1 , wherein a rod body connected between the sealing portion and the rotating center has a fan-shaped structure; a circle center of the fan-shaped structure and a circle center of the arc-shaped sealing portion are located on a central axis of the rotating center; the reset arm is connected to a rod body between the operating portion and the rotating center; a middle part of the reset arm is bent to form at least two arc-shaped portions; and a clamping portion of the reset arm cooperates with a clamping groove formed in the housing, such that the reset arm deforms.
6 . The air-blowing tripping mechanism according to claim 1 , wherein the housing comprises two cover bodies; a first groove and a second groove are formed in one side, facing the push rod, of each cover body, and the first grooves of the two cover bodies are enclosed to form a mounting groove; a rotary mounting hole in which the push rod is rotatably assembled is formed in a middle of the mounting groove; the operating portion penetrates out of the mounting groove and cooperates with the operating mechanism; the second grooves of the two cover bodies are enclosed to form the sealing cavity; each cover body is provided with one air-blowing channel which is communicated with the sealing cavity; an opening through which are communicated with each other are formed between the mounting groove and the sealing cavity; the air-blowing end passes through the opening so as to extend into the sealing cavity; and a clamping groove which cooperates with the reset arm is formed in one side of the mounting groove close to the opening.
7 . The air-blowing tripping mechanism according to claim 1 , wherein middle parts of side walls of the sealing cavity protrude toward each other, such that the sealing cavity is segmented into a swing space and an expansion space; the swing space provides a motion space for the air-blowing end; and the insulating partition plate is assembled in the expansion space to block the air-blowing channel provided in the expansion space.
8 . A molded case circuit breaker, comprising a shell, and the air-blowing tripping mechanism according to claim 1 , the operating mechanism and an arc extinguishing system which are disposed in the shell, wherein the operating portion of the air-blowing tripping mechanism is provided correspondingly to the operating mechanism, and the air-blowing channel of the air-blowing tripping mechanism is communicated with the arc extinguishing system.
9 . The molded case circuit breaker according to claim 8 , wherein at least two circuit breaker poles and at least one operating mechanism are disposed in the shell; each circuit breaker pole comprises a phase pole shell, and a contact mechanism and the arc extinguishing system disposed in the phase pole shell; the air-blowing tripping mechanism is disposed between two adjacent circuit breaker poles; and two adjacent phase pole shells cooperate with each other to form the housing rotatably connected to the push rod.
10 . The molded case circuit breaker according to claim 9 , wherein the air-blowing channel of the air-blowing tripping mechanism is communicated with the arc extinguishing system of adjacent circuit breaker pole; the arc extinguishing system comprises an arc extinguishing chamber; a first air-blowing port which is communicated with an interior of the arc extinguishing chamber is formed in one side or both sides of a middle of the arc extinguishing chamber; the first air-blowing port is communicated with one end of the air-blowing channel formed in the housing, and another end of the air-blowing channel serves as a second air-blowing port and is blocked by the insulating partition plate.
11 . The molded case circuit breaker according to claim 8 , wherein at least two circuit breaker poles and at least one operating mechanism are disposed in the shell; each circuit breaker pole comprises a contact mechanism and the arc extinguishing system; the air-blowing tripping mechanism is disposed between two adjacent circuit breaker poles, and the arc extinguishing systems of the two circuit breaker poles are partitioned by the housing of the air-blowing tripping mechanism.
12 . The molded case circuit breaker according to claim 11 , wherein the push rod of the air-blowing tripping mechanism is located between the two circuit breaker poles, two operating portions are disposed side by side at one end of the push rod, and an avoidance groove is formed between the two operating portions, and the two operating portions cooperate with a same operating mechanism, respectively.