Energy tripping mechanism and circuit breaker

Abstract

An energy tripping mechanism and a circuit breaker relate to the technical field of circuit breakers, and include: a first shell, which is provided with an air inlet cavity, an air collecting cavity and a gas flow channel along the height direction, an air inlet is provided at the air inlet cavity, an air outlet is provided at the air collecting cavity, and a chamber is provided on one side, and the upper side of the chamber is connected with the air collecting cavity; a hitting rod includes an integrally arranged main body and an actuating part, the main body is placed in the chamber, the actuating part extends out of the chamber, the main body extends toward one side of the air collecting cavity to form a push plate, and a cutting piece is provided at the lower end of the push plate; an elastic part, using the cutting piece provided at the position where the hitting rod contacts the wall of the air collecting cavity, when the hitting rod is reset, the resetting force can be used to shovel off the metal particles adhering to the cavity wall and discharge them from the air flow channel, which can well avoid the adhesion of high-temperature metal particles in the gas generated when the phase line is disconnected to the cavity wall, affecting the resetting of the hitting rod.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to an energy tripping mechanism and a circuit breaker. Background Art

[0002] During the operation of the circuit breaker, when a short circuit occurs in one phase, it must be tripped promptly and quickly. The tripping process is often achieved by triggering the tripping mechanism through an external linkage mechanism.

[0003] As for double-breakpoint circuit breakers, since the double-breakpoint contact system has many parts and a complex structure, after the contact bridge is repelled by the electric repulsion force, the moving contact may be closed twice or closed multiple times due to jitter under the action of the spring tension due to the reduction of the electric repulsion force. If the clamping device cannot quickly clamp the contact bridge in the extreme position, it will be very unfavorable for breaking. Therefore, the double-breakpoint circuit breaker has two main tripping modes when encountering a short-circuit and large current: air-blowing energy tripping and instantaneous tripping. The air-blowing energy tripping has a faster protection speed than the instantaneous tripping. Therefore, when encountering a large short-circuit fault current, the air-blowing energy tripping can act in time to hit the circuit breaker traction rod and reset it in time.

[0004] The air-blowing energy tripping method achieves tripping through gas protection. Since it utilizes the short-circuit current to generate heat to cause the gas to expand and drive the mechanism to achieve tripping, its effect is better.

[0005] In this regard, the use of an air-blowing energy tripping mechanism in a double-breakpoint circuit breaker can better achieve a rapid tripping response of the circuit breaker. In this regard, the applicant applied for a tripping device and a circuit breaker in China on November 15, 2023 and was authorized on May 24, 2024. The Chinese patent discloses a pneumatic energy tripping mechanism, which uses the gas generated by any phase short circuit to push the air push part, and drives the hitting rod to trigger the traction rod of the circuit breaker to complete the tripping action. In the actual production process, the applicant found that when it is suitable for voltages below 415V, the high-temperature metal particles contained in the gas generated between the phase short circuits will be blocked by the inclined upward ribs at the designed gas flow channel outlet. The metal particles will fall along the gas flow channel and will not affect the gas push part. However, the applicant found that when the voltage is greater than 415V and reaches 690V and above, the upward inclined ribs cannot play a good role in blocking the metal particles. Instead, it will affect the discharge of high-temperature metal particles, thereby affecting the action of the gas push part. Moreover, since the high-temperature metal particles have a certain degree of adhesion, they adhere to the wall after rapid cooling, which makes it impossible to reset the rod normally, affecting subsequent use. Therefore, how to solve the problem of high-temperature metal particles adhering to the wall is the most important issue whether the gas blowing energy tripping mechanism can be normally applied to high-voltage disconnection conditions of 690V and above. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide an energy tripping mechanism and a circuit breaker.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An energy tripping mechanism, comprising:

[0009] A first shell is provided with an air inlet cavity, an air collecting cavity and a gas flow channel connecting the air inlet cavity and the air collecting cavity along the height direction, the air inlet cavity is provided with an air inlet, the air collecting cavity is provided with an air outlet, a chamber is provided on one side of the air inlet cavity, the air collecting cavity and the gas flow channel, and the upper side of the chamber is connected with the air collecting cavity;

[0010] A beating rod is rotatably arranged in the chamber, and comprises an integrally arranged main body and an actuating part, wherein the main body is placed in the chamber, the actuating part extends out of the chamber, the main body extends toward one side of the gas collecting chamber to form a push plate, and a cutting piece is arranged at the lower end of the push plate toward the gas collecting chamber to cut metal particles attached to the inner wall of the gas collecting chamber when the beating rod is reset;

[0011] The elastic member is arranged on a side of the driving rod away from the air collecting chamber, and is used to drive the driving rod to move toward the air collecting chamber.

[0012] A sliding channel is provided at the upper side of the chamber and the air outlet of the gas collecting cavity, and the push plate can be slidably arranged in the sliding channel.

[0013] The sliding channel is arranged to be inclined downward at a side close to the gas collecting cavity.

[0014] The cutting piece is a structure with a sharp cutting portion at one end.

[0015] The upper end of the gas flow channel is provided with a first rib and a second rib, and the first rib and the second rib are arranged at the outlet of the gas flow channel in an inverted eight-shaped shape.

[0016] The gas flow channel is provided with a groove arranged along the direction of the gas flow channel axis L4.

[0017] The gas flow channel has at least two sections, the first section is gradually narrowed and extended, the second section is gradually enlarged and extended, and the first rib and the second rib are located in the second section.

[0018] A NOMEX paperboard is arranged in the air inlet cavity, and the NOMEX paperboard is arranged in contact with the air inlet.

[0019] It is also provided with a second shell, which is used to cooperate with the first shell to enclose the air inlet cavity, the air collecting cavity and the gas flow channel.

[0020] A circuit breaker comprises a base, an operating mechanism, a plurality of breaking units and the above-mentioned energy tripping mechanism, wherein the breaking units are installed in the base, the energy tripping mechanism is arranged between two adjacent breaking units, and the operating mechanism is arranged on the upper part of the breaking units and the energy tripping mechanism.

[0021] The beneficial effects of the present invention are as follows: by utilizing the cutting piece arranged at the position where the hitting rod contacts the wall of the gas collecting chamber, when the hitting rod is reset, the resetting force can be utilized to scrape off the metal particles adhering to the chamber wall and discharge them from the air flow channel, thereby effectively avoiding the adhesion of high-temperature metal particles in the gas generated when the phase line is disconnected to the chamber wall and affecting the resetting of the hitting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the energy tripping mechanism provided by the present invention.

[0023] Figure 2 This is an internal schematic diagram of the energy tripping mechanism provided by the present invention.

[0024] Figure 3 An exploded schematic diagram of the first shell and the second shell of the energy tripping mechanism provided by the present invention.

[0025] Figure 4 A schematic structural diagram of the first shell of the energy tripping mechanism provided by the present invention.

[0026] Figure 5 for Figure 4 A magnified schematic diagram of center A.

[0027] Figure 6 This is a schematic structural diagram of the driving rod of the energy tripping mechanism provided by the present invention.

[0028] Figure 7 This is a schematic diagram of the internal structure of the circuit breaker provided by the present invention.

[0029] In the figure, 100, first shell; 110, chamber; 120, gas collecting chamber; 130, air inlet chamber; 140, gas flow channel; 141, first throttling channel; 142, second throttling channel; 143, first rib; 144, second rib; 150, groove; 160, sliding channel; 200, second shell; 210, convex rib; 300, hitting rod; 310, main body; 320, actuating part; 330, push plate; 331, cutting part; 400, elastic part; 500, NOMEX cardboard; 600, air inlet; 10, base; 20, operating mechanism; 30, breaking unit; 40, energy tripping mechanism. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] The present invention discloses an energy tripping mechanism, which is used for a double-breakpoint circuit breaker and is installed between two adjacent disconnecting units 30 of the double-breakpoint circuit breaker, and the air inlet of the energy tripping mechanism is connected with the air outlet of the disconnecting unit, so that the expanded gas generated when the disconnecting unit is disconnected can be input into the air inlet cavity of the energy tripping mechanism, that is, when the circuit breaker is opened, gas is generated in the arc extinguishing chamber of each disconnecting unit and forms an airflow to be discharged from the air outlet, and the outermost through hole and the air outlet are blocked by the outer shell of the circuit breaker, then the discharged airflow will enter the corresponding air inlet cavity through each air inlet hole respectively, so that the gas generated in the arc extinguishing chamber of each disconnecting unit can be used to jointly promote the movement of the rod to drive the operating mechanism on the circuit breaker to achieve tripping.

[0033] like Figure 1 and Figure 2 As shown, the energy tripping mechanism includes a first shell and a driving rod, and the energy tripping mechanism is fixed by the breaking units on both sides.

[0034] like Figure 4 and Figure 5 As shown, the first shell 100 is provided with an air inlet chamber 130, an air collecting chamber 120 and a gas flow channel 140 connecting the air inlet chamber 130 and the air collecting chamber 120 along the height direction, that is, the air inlet chamber, the gas flow channel and the air collecting chamber are respectively arranged from low to high, the air inlet chamber 130 is provided with an air inlet port 600, the air collecting chamber 120 is provided with an air outlet, and a chamber 110 is provided on one side of the air inlet chamber 130, the air collecting chamber 120 and the gas flow channel 140, and the upper side of the chamber 110 is connected with the air collecting chamber 120, the gas generated by the breaking unit can enter the air inlet chamber through the air inlet port, enter the air collecting chamber after being accelerated through the gas flow channel, and act on the push plate of the hitting rod that blocks the air outlet of the air collecting chamber, so that the hitting rod rotates relatively.

[0035] like Figure 6As shown, the hitting rod 300 is rotatably arranged in the chamber 110, and includes a main body 310 and an actuating portion 320 that are integrally arranged. The main body 310 is placed in the chamber 110, and the actuating portion 320 extends out of the chamber 110. The bottom of the hitting rod and the first shell are rotatably arranged, and the actuating portion 320 extends out of the chamber and abuts against the traction rod of the operating mechanism 20. The main body 310 extends toward one side of the gas collecting chamber 120 to form a push plate 330. There is a certain gap between the upper and lower ends of the push plate and the inner wall of the gas collecting chamber, so that It can move relatively under the push of gas, and the lower end of the push plate 330 is provided with a cutting piece 331 towards the direction of the gas collecting chamber 120 for cutting metal particles attached to the inner wall of the gas collecting chamber 120 when the hitting rod 300 is reset. The cutting piece is arranged slightly close to the inner wall of the gas collecting chamber so that the tip is arranged toward the inner wall. When the hitting rod is reset, the tip will produce a shoveling action, thereby enabling it to shovel away the metal particles adhered to the inner wall of the gas collecting chamber. At the same time, the design of the tip can also reduce its contact surface and reduce resistance, so that it can better shovel away the metal particles on the inner wall of the gas collecting chamber.

[0036] The elastic member 400 is arranged on the side of the driving rod 300 away from the gas collecting chamber 120, that is, one side of the elastic member contacts the driving rod, and the other end contacts the inner wall of the chamber, and is used to drive the driving rod 300 to move toward the gas collecting chamber 120. When the driving rod is rotated by force, the driving rod applies a thrust to the elastic member. As the arc disappears, gas is no longer generated in the breaking unit. When the thrust is less than the elastic force, the elastic member can push the driving rod to move toward the gas collecting chamber to reset, so as to facilitate the next opening and tripping operation.

[0037] In this embodiment, the elastic member 400 is a compression spring or a spring, and in other embodiments, a leaf spring or a tension spring may also be used.

[0038] In this embodiment, a sliding channel 160 is provided at the upper side of the chamber 110 and the gas outlet of the gas collecting chamber 120. The sliding channel 160 connects the chamber and the gas collecting chamber. The push plate 330 can be slidably disposed in the sliding channel 160, and the axis of the sliding channel is as shown in FIG. Figure 5 As shown in L1 in the figure, the front section is arranged in parallel, and the rear section is tilted downward, so as to be smoothly connected with the gas outlet of the gas flow channel. The design of the rear section tilted downward enables the hitting rod to move better in the sliding channel when it rotates relatively, and the gap between the upper and lower ends of the pushing part and the sliding channel remains unchanged, so that the gas in the gas collecting cavity can better act on the push plate and drive it to move along the sliding channel.

[0039] In this embodiment, the upper and lower surfaces of the push plate of the hitting rod are arranged to be inclined downward, and cutting pieces are provided at both ends. The tip of the cutting piece on the lower side is arranged downward, and the tip of the cutting piece on the upper side is arranged upward. The displacement generated by the rotation of the hitting rod is used to remove metal particles on the upper and lower inner walls of the sliding channel. The inclination angle of the cutting piece at the lower end is slightly larger than the inclination angle of the sliding channel, so that the tip of the cutting piece is as close to the inner wall as possible, thereby better achieving the cutting effect.

[0040] The sliding channel 160 is arranged to be inclined downward on one side close to the gas collecting chamber 120. The downward inclined design not only meets the path requirement when the handle rotates, but also allows the shoveled metal particles to fall downward along the slope and fall into the air inlet chamber through the gas flow channel, thereby avoiding the handle from getting stuck or hindering its resetting at the sliding channel.

[0041] The cutting piece 331 is a structure with a sharp cutting portion at one end, which can be a triangular cross-section or a sheet structure with a scraping effect. Its function is that when the push plate moves, it has a certain cutting or scraping action on the inner wall in contact with it, so that the metal particles attached to the inner wall are scraped away by the cutting piece, and are pushed to the upper end of the gas flow channel by the push plate, and fall into the air inlet cavity along the gas flow channel.

[0042] The upper end of the gas flow channel 140 is provided with a first rib 143 and a second rib 144, and the first rib 143 and the second rib 144 are arranged in an inverted eight-shaped shape at the outlet of the gas flow channel 140. Figure 5 As shown, the first rib 143 extends from the lower side wall of the sliding channel toward the gas flow channel, and the second rib is located below the first rib. At the same time, the second rib extends inward from the side wall on the other side of the gas flow channel. The upper surface of the first rib is as shown in FIG. Figure 5 The axis L2 is set in the middle, and the upper surface of the second rib is as shown Figure 5 The axis L3 in the middle is set, and the two axes are set in an inverted eight shape, and there is a gap between the tops of the two axes. The design of the first rib and the second rib can block the high-temperature metal particles in the rising gas, which can greatly reduce the high-temperature metal particles entering the gas collecting cavity with the gas. At the same time, the inverted eight-shaped design is also conducive to better gas aggregation for pressurization, giving the rod a greater driving force, accelerating the action time of the energy tripping rod, and thereby improving the breaking speed of the circuit breaker.

[0043] The gas flow channel 140 is provided with a groove 150 arranged along the gas flow channel axis L4. The groove 150 is located between the first rib and the second rib, which can facilitate the discharge of arc particle impurities. At the same time, during the product breaking process, the small groove can directional guide the airflow, accelerate the gas, and speed up the rod release.

[0044] The gas flow channel 140 is at least two sections, the first throttle channel 141 is gradually narrowed and extended, the second throttle channel 142 is gradually enlarged and extended, and the first rib 143 and the second rib 144 are located in the second throttle channel 142. The entire gas flow channel is designed as a Laval nozzle. The front half of the nozzle shrinks from large to small toward the middle to a narrow throat, and then expands from small to large and outward to the rear end after the narrow throat. The gas flows into the front half of the nozzle under high pressure, and escapes from the rear half after passing through the narrow throat, thereby increasing the impact force of the airflow, making the air thrust part 5 move faster, and making the striking rod 4 rotate faster.

[0045] A NOMEX paperboard 500 is disposed in the air inlet cavity 130, and the NOMEX paperboard 500 is disposed in contact with the air inlet 600. The NOMEX paperboard 500 is approximately U-shaped, and its two ends are respectively attached to the air inlets 600 of the first shell and the second shell, and when air is introduced into the air inlet, the gas can push open the NOMEX paperboard and enter the air inlet cavity, and the design of the NOMEX paperboard can prevent the entry of arcs, and can also prevent metal particles shoveled by the push plate from falling into the air inlet and blocking the air inlet.

[0046] like Figure 3 As shown, it is also provided with a second shell 200, which is used to cooperate with the first shell 100 to enclose the air inlet cavity 130, the gas collecting cavity 120 and the gas flow channel 140. The inner wall of the second shell 200 is provided with a convex rib 210. When the second shell 200 cooperates with the first shell, the convex rib 210 is located at the upper end of the air inlet cavity close to the gas flow channel, which prevents the gas from the air inlet 600 from directly entering the gas flow channel, and also can play a certain role in blocking the falling metal particles.

[0047] At the same time, the second shell is closely matched with the first shell, so as to improve the sealing performance of the air inlet cavity 130, the gas collecting cavity 120 and the gas flow channel 140, thereby increasing the thrust of the gas on the push plate.

[0048] like Figure 7 As shown, the present invention also provides a circuit breaker, which includes a base 10, an operating mechanism 20, a plurality of breaking units 30 and the above-mentioned energy tripping mechanism 40, wherein the breaking unit 30 is installed in the base 10, the energy tripping mechanism 40 is arranged between two adjacent breaking units 30, and the operating mechanism 20 is arranged on the upper part of the breaking unit 30 and the energy tripping mechanism 40.

[0049] The energy tripping mechanism is clamped by two disconnecting units to fix both sides of the energy tripping mechanism. In other embodiments, the first shell can be directly formed on the outer shell of one of the disconnecting units, and the second shell is arranged separately or on another disconnecting unit that cooperates with it.

[0050] In this embodiment, the first shell and the second shell are independently arranged.

[0051] The embodiments should not be regarded as limiting the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. An energy tripping mechanism, characterized in that: It includes: A first shell (100) is provided with an air inlet cavity (130), an air collecting cavity (120), and a gas flow channel (140) communicating with the air inlet cavity (130) and the air collecting cavity (120) along a height direction; the air inlet cavity (130) is provided with an air inlet port (600); the air collecting cavity (120) is provided with an air outlet; a chamber (110) is provided on one side of the air inlet cavity (130), the air collecting cavity (120), and the gas flow channel (140); the upper side of the chamber (110) is communicated with the air collecting cavity (120); A beating rod (300) is rotatably disposed in the chamber (110), comprising an integrally disposed main body (310) and an actuating portion (320), wherein the main body (310) is disposed in the chamber (110), the actuating portion (320) extends out of the chamber (110), the main body (310) extends toward one side of the gas collecting chamber (120) to form a push plate (330), and a cutting piece (331) is provided at the lower end of the push plate (330) toward the gas collecting chamber (120) for cutting metal particles attached to the inner wall of the gas collecting chamber (120) when the beating rod (300) is reset; The elastic member (400) is arranged on a side of the driving rod (300) away from the air collecting chamber (120), and is used to drive the driving rod (300) to move in the direction of the air collecting chamber (120).

2. An energy tripping mechanism according to claim 1, characterized in that: A sliding channel (160) is provided at the upper side of the chamber (110) and the gas outlet of the gas collecting chamber (120), and the push plate (330) can be slidably arranged in the sliding channel (160).

3. An energy tripping mechanism according to claim 2, characterized in that: The sliding channel (160) is arranged inclined downward on a side close to the gas collecting cavity (120).

4. An energy tripping mechanism according to claim 1, characterized in that: The cutting piece (331) is a structure having a sharp cutting portion at one end.

5. An energy tripping mechanism according to claim 1, characterized in that: A first rib (143) and a second rib (144) are provided at the upper end of the gas flow channel (140); the first rib (143) and the second rib (144) are arranged in an inverted figure eight shape at the outlet of the gas flow channel (140).

6. An energy tripping mechanism according to claim 1 or 5, characterized in that: The gas flow channel (140) is provided with a groove (150) arranged along the direction of the gas flow channel axis L4.

7. An energy tripping mechanism according to claim 5, characterized in that: The gas flow channel (140) has at least two sections, the first throttle channel (141) is arranged to gradually shrink and extend, the second throttle channel (142) is arranged to gradually expand and extend, and the first rib (143) and the second rib (144) are located in the second throttle channel (142).

8. An energy tripping mechanism according to claim 1, characterized in that: A NOMEX paperboard (500) is arranged in the air inlet cavity (130), and the NOMEX paperboard (500) is arranged in contact with the air inlet (600).

9. An energy tripping mechanism according to claim 1, characterized in that: It is also provided with a second shell (200) for cooperating with the first shell (100) to enclose the air inlet cavity (130), the air collecting cavity (120) and the gas flow channel (140).

10. A circuit breaker, characterized in that: It comprises a base (10), an operating mechanism (20), a plurality of disconnecting units (30) and an energy tripping mechanism (40) as claimed in any one of claims 1 to 9, wherein the disconnecting unit (30) is installed in the base (10), the energy tripping mechanism (40) is arranged between two adjacent disconnecting units (30), and the operating mechanism (20) is arranged on the upper parts of the disconnecting unit (30) and the energy tripping mechanism (40).

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