Arc extinguishing device of molded case circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, and discloses a molded case circuit breaker arc extinguishing device, which comprises an arc extinguishing chamber, a blowing mechanism and an arc extinguishing cover mechanism, the side surface of the arc extinguishing chamber is fixedly connected with the side surface of the blowing mechanism, the side surface of the arc extinguishing chamber is fixedly connected with the side surface of the arc extinguishing cover mechanism, the blowing mechanism comprises a sealing box, and the sealing box is fixedly connected with the blowing mechanism. The side surface of the sealing box is fixedly connected with the side surface of the arc extinguish chamber, a nylon gas production material is arranged in the sealing box, the inner wall of the side surface of the sealing box is fixedly connected with a mounting cylinder, and the side surface of the mounting cylinder is fixedly connected with an exhaust pipe; the threaded rod is rotated according to use requirements to drive the mounting plate to move up and down along the inner wall of the side face of the mounting cylinder through the threads, the position of the mounting plate is adjusted, the deformation quantity of the pressure spring is adjusted, the pressure of the pressure spring on the sealing piston is controlled, and the flow speed of gas sprayed out of the blowing mechanism can be flexibly controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, and more specifically to an arc extinguishing device for a molded case circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal or abnormal circuit conditions. A circuit breaker is an important electrical device for the protection and operation of power systems. It can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. Molded case circuit breakers are common circuit breakers that can automatically cut off current after the current exceeds the trip setting. Molded case refers to a plastic insulator used as the outer shell of the device to isolate conductors and grounded metal parts. The arc extinguishing chamber is an important mechanism of the circuit breaker. During use, when the circuit breaker is subjected to a momentary current shock, an arc will be generated in the process of separation between the moving and static contacts. The arc has a high temperature and can easily ignite combustibles and cause a fire. Therefore, an arc extinguishing device in the arc extinguishing chamber is required to eliminate the arc and improve the safety of the circuit breaker.

[0003] Insufficient existing technology: the existing circuit breaker fire extinguishing mechanism mostly uses an electric arc to decompose the long-term materials in the air-blowing type. When gas is generated, the pressure in the air-blowing increases to generate a high-pressure airflow to blow the arc into the grid of the arc-extinguishing cover. The arc is blocked by the insulating grid, and the arc bends under the action of external force, thereby lengthening the arc and enhancing cooling, thereby achieving arc extinguishing. However, during use, the internal air pressure of the blown airflow cannot be controlled to control the blown airflow velocity, affecting the arc extinguishing effect; at the same time, the existing insulating grids are mostly integrated structures, and the overall exhaust gas is required when they need to be replaced, resulting in waste. Utility Model Content

[0004] In order to overcome the above defects of the prior art, the utility model provides an arc extinguishing device for a molded case circuit breaker to solve the problems existing in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an arc extinguishing device for a molded case circuit breaker, comprising an arc extinguishing chamber, and also comprising: a blowing mechanism and an arc extinguishing cover mechanism, the side of the arc extinguishing chamber is fixedly connected to the side of the blowing mechanism, the side of the arc extinguishing chamber is fixedly connected to the side of the arc extinguishing cover mechanism, the blowing mechanism comprises a sealing box, the sealing box, the side of the sealing box is fixedly connected to the side of the arc extinguishing chamber, the interior of the sealing box is filled with nylon gas-generating material, the side inner wall of the sealing box is fixedly connected to a mounting cylinder, the side of the mounting cylinder is fixedly connected to an exhaust pipe, the bottom end of the mounting cylinder is provided with a through hole, the top end of the sealing box is movably sleeved with a threaded rod, the side of the threaded rod is threadedly connected to a mounting plate, the bottom end of the mounting plate is fixedly connected to a pressure spring, the bottom end of the pressure spring is fixedly connected to a sealing piston, the side of the sealing piston is fixedly connected to a sealing ring, and the side of the sealing ring is movably connected to the side inner wall of the mounting cylinder.

[0006] Furthermore, a limiting groove is provided on the inner wall of the side of the mounting tube, and a limiting block is fixedly connected to the side of the mounting plate corresponding to the position of the limiting groove, and the side of the limiting groove is movably connected to the side of the limiting block.

[0007] Furthermore, a first mounting groove is provided at the top of the sealing box, a knob is movably connected to the side of the first mounting groove, a first clamping block is fixedly connected to the inner wall of the top of the knob, a second clamping block is fixedly connected to the bottom end of the first clamping block, a first clamping groove is provided at the top of the sealing box, the side of the first clamping groove is meshed with the side of the first clamping block, and a second clamping groove is provided at the top of the threaded rod, the side of the second clamping groove is meshed with the side of the second clamping block.

[0008] Furthermore, a mounting ring is movably sleeved on the inner wall of the top end of the knob, a tension spring is fixedly connected to the bottom end of the mounting ring, and the bottom end of the tension spring is fixedly connected to the top end of the sealing box.

[0009] Furthermore, the bottom end of the threaded rod is fixedly connected to a touch switch, the top end of the sealing piston is fixedly connected to a first protective shell, the side of the first protective shell is movably connected to a second protective shell, and the top end of the second protective shell is fixedly connected to the bottom end of the mounting plate.

[0010] Furthermore, the arc extinguishing cover mechanism includes a mounting shell, a side surface of the mounting shell is fixedly connected to a side surface of the arc extinguishing chamber, a second mounting groove is provided on the inner wall of the side surface of the mounting shell, an insulating grid is movably connected to the side surface of the second mounting groove, a limiting platform is provided on the side surface of the insulating grid, and a fixing bar is fixedly connected to the side surface of the mounting shell by a threaded nail, and the side surface of the fixing bar is movably connected to the side surface of the insulating grid.

[0011] Furthermore, a top end of the insulating grid is provided with an arc surface.

[0012] Technical effects and advantages of the utility model:

[0013] 1. The utility model pulls the knob upward to move the pressure spring upward and separate from the first slot according to usage requirements, and rotates the knob to drive the second block to rotate. The second block is always engaged with the second slot to drive the threaded rod to rotate, and the mounting plate is driven to move up and down along the side inner wall of the mounting cylinder through the thread, and the position of the mounting plate is adjusted to adjust the deformation of the pressure spring and control the pressure of the pressure spring on the sealing piston. After the adjustment is completed, the knob is released, and the mounting ring pulls the knob downward to move the first block downward and snap into the first slot to fix the knob, thereby fixing the threaded rod, which is conducive to flexible control of the flow rate of the gas ejected from the hair dryer.

[0014] 2. The utility model moves the sealing piston to the top of the exhaust pipe when the internal pressure of the sealing box reaches a certain value. At the same time, the top of the sealing piston contacts the touch switch, so that the indicator light on the surface of the circuit breaker controlled by the touch switch emits green light, indicating that the sealing box is normally ejecting gas. The gas is ejected from the exhaust pipe to blow the arc to the surface of the insulating grid to extinguish the arc. When the internal pressure of the sealing box is insufficient and the top of the sealing piston cannot contact the touch switch, the indicator light on the surface of the circuit breaker controlled by the touch switch emits red light, indicating that the sealing piston cannot move to the top of the exhaust pipe, so that the gas in the sealing box cannot be ejected normally and needs to be dealt with in time, which is conducive to ensuring the normal operation of the arc extinguishing device.

[0015] 3. The utility model installs the insulating grid by inserting the insulating grid into the second installation groove in sequence, placing the fixing bar on the side of the installation shell and clamping the limit platform and fixing the fixing bar with screws, thereby achieving installation and fixation of the insulating grid, which is conducive to facilitating the replacement of a single insulating grid and avoiding waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the installation shell structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the insulating grid structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the sealing box of the utility model;

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the installation tube of the utility model;

[0021] Figure 6 For the utility model Figure 5A structural diagram;

[0022] Figure 7 This is a schematic diagram of the knob structure of the utility model.

[0023] The accompanying drawings are marked as follows: 1. arc extinguishing chamber; 2. blower mechanism; 201. sealing box; 202. exhaust pipe; 203. knob; 204. mounting tube; 205. first protective shell; 206. second protective shell; 207. threaded rod; 208. limit groove; 209. mounting plate; 210. touch switch; 211. pressure spring; 212. sealing piston; 213. sealing ring; 214. through hole; 215. mounting ring; 216. tension spring; 217. first mounting groove; 218. first clamping groove; 219. second clamping groove; 220. second clamping block; 221. first clamping block; 3. arc extinguishing cover mechanism; 301. mounting shell; 302. threaded nail; 303. second mounting groove; 304. insulating grid; 305. limit platform; 306. arc surface; 307. fixing strip. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are only examples. The arc extinguishing device of a molded case circuit breaker involved in the present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0025] Reference Figures 1 to 7The utility model provides an arc extinguishing device for a molded case circuit breaker, comprising an arc extinguishing chamber 1, and also comprising: a blower mechanism 2 and an arc extinguishing cover mechanism 3, the side of the arc extinguishing chamber 1 is fixedly connected to the side of the blower mechanism 2, the side of the arc extinguishing chamber 1 is fixedly connected to the side of the arc extinguishing cover mechanism 3, the blower mechanism 2 comprises a sealing box 201, the sealing box 201, the side of the sealing box 201 is fixedly connected to the side of the arc extinguishing chamber 1, the interior of the sealing box 201 is filled with nylon gas-generating material, the side inner wall of the sealing box 201 is fixedly connected with a mounting cylinder 204, the side of the mounting cylinder 204 is fixedly connected with an exhaust pipe 202, the bottom end of the mounting cylinder 204 is provided with a through hole 214, the top end of the sealing box 201 is movably sleeved with a threaded rod 207, the side of the threaded rod 207 is threadedly connected with a mounting plate 209, the bottom end of the mounting plate 209 is fixedly connected with a pressure spring 211, the bottom end of the pressure spring 211 is fixedly connected with a sealing piston 212, the side of the sealing piston 212 is fixedly connected with The sealing ring 213, the side of the sealing ring 213 is movably connected to the side inner wall of the mounting tube 204, the pressure spring 211 pushes the sealing piston 212 downward to block the through hole 214, and when the circuit breaker is used, an arc is generated to heat the nylon gas-producing material inside the sealing box 201 to generate gas, and the internal pressure of the sealing box 201 increases, so that the sealing piston 212 moves upward, and when the internal pressure of the sealing box 201 reaches a certain value, the sealing piston 212 moves to the top of the exhaust pipe 202, and the gas is ejected from the exhaust pipe 202 to blow the arc to the arc extinguishing cover mechanism 3 for arc extinguishing, and at the same time, according to the use of the rotating threaded rod 207, the mounting plate 209 is driven to move up and down along the side inner wall of the mounting tube 204 through the thread, and the position of the mounting plate 209 is adjusted, thereby adjusting the deformation of the pressure spring 211, controlling the pressure of the pressure spring 211 on the sealing piston 212, and controlling the pressure of the gas when it is ejected from the exhaust pipe 202, so that the gas maintains a suitable flow rate.

[0026] Among them, a limiting groove 208 is opened on the inner wall of the side of the mounting tube 204, and the side of the mounting plate 209 is fixedly connected to the limiting block at the position corresponding to the limiting groove 208. The side of the limiting groove 208 is movably connected to the side of the limiting block. When the mounting plate 209 moves up and down, the limiting block on the side of the mounting plate 209 slides along the limiting groove 208 to limit the mounting plate 209.

[0027] The top of the sealing box 201 is provided with a first mounting groove 217, the side of the first mounting groove 217 is movably connected with the knob 203, the top inner wall of the knob 203 is fixedly connected with the first clamping block 221, the bottom of the first clamping block 221 is fixedly connected with the second clamping block 220, the top of the sealing box 201 is provided with a first clamping groove 218, the side of the first clamping groove 218 is meshed with the side of the first clamping block 221, the top of the threaded rod 207 is provided with a second clamping groove 219, the second clamping groove 219 is fixedly connected with the first clamping block 220, and the second clamping groove 219 is fixedly connected with the second clamping block 220. The side surface is meshed with the side surface of the second block 220. Pulling the knob 203 upward causes the pressure spring 211 to move upward and separate from the first slot 218. Turning the knob 203 drives the second block 220 to rotate. The second block 220 is always meshed with the second slot 219 to drive the threaded rod 207 to rotate. After the adjustment is completed, the knob 203 moves downward to cause the first block 221 to move downward and engage into the first slot 218 to fix the knob 203, thereby fixing the threaded rod 207.

[0028] Among them, the top inner wall of the knob 203 is movably sleeved with a mounting ring 215, and the bottom end of the mounting ring 215 is fixedly connected with a tension spring 216, and the bottom end of the tension spring 216 is fixedly connected to the top of the sealing box 201. After the adjustment is completed, the mounting ring 215 pulls the knob 203 to move downward so that the first clamping block 221 is clamped into the first clamping groove 218. At the same time, when the knob 203 is rotated, the mounting ring 215 rotates on the top inner wall of the knob 203 to avoid affecting the tension spring 216.

[0029] Among them, the bottom end of the threaded rod 207 is fixedly connected with the touch switch 210, the top end of the sealing piston 212 is fixedly connected with the first protective shell 205, the side of the first protective shell 205 is movably connected with the second protective shell 206, the top end of the second protective shell 206 is fixedly connected to the bottom end of the mounting plate 209, and the second protective shell 206 and the threaded rod 207 cooperate to protect the touch switch 210. At the same time, when the circuit breaker is in use and the arc is extinguished, the gas is ejected from the exhaust pipe 202, and the top end of the sealing piston 212 contacts the touch switch 210 so that the touch switch 210 controls the indicator light on the surface of the circuit breaker to emit green light, indicating that the blower mechanism 2 is normally ejecting gas. When the top end of the sealing piston 212 cannot contact the touch switch 210, it indicates that the sealing piston 212 cannot move to the top of the exhaust pipe 202, so that the gas inside the sealing box 201 cannot be ejected normally, which needs to be dealt with in time.

[0030] Among them, the arc extinguishing cover mechanism 3 includes a mounting shell 301, the side of the mounting shell 301 is fixedly connected to the side of the arc extinguishing chamber 1, a second mounting groove 303 is provided on the inner wall of the side of the mounting shell 301, an insulating grid 304 is movably connected to the side of the second mounting groove 303, a limiting platform 305 is provided on the side of the insulating grid 304, a fixing bar 307 is fixedly connected to the side of the mounting shell 301 through a threaded nail 302, and the side of the fixing bar 307 is movably connected to the side of the insulating grid 304. When installing the insulating grid 304, the insulating grid 304 is inserted into the second mounting groove 303 in sequence, the fixing bar 307 is placed on the side of the mounting shell 301, the limiting platform 305 is clamped, and the fixing bar 307 is fixed by the threaded nail 302, thereby realizing the installation and fixation of the insulating grid 304.

[0031] The top of the insulating grid 304 is provided with an arc surface 306 , and the arc surface 306 increases the contact area between the insulating grid 304 and the arc.

[0032] The working principle of the utility model is as follows: the insulating grid 304 is inserted into the second installation groove 303 in sequence, the fixing strip 307 is placed on the side of the installation shell 301 and the limit platform 305 is clamped and the fixing strip 307 is fixed by the threaded nail 302, so as to realize the installation and fixation of the insulating grid 304, the installation shell 301 is installed at a suitable position of the arc extinguishing chamber 1, and a proper amount of nylon gas-generating material is loaded into the sealing box 201. According to the use requirements, the knob 203 is pulled upward to make the pressure spring 211 move upward and separate from the first slot 218, and the knob 203 is turned to drive the second clamping block 220 to rotate, and the second clamping block 220 is always engaged with the second slot 219 to drive the threaded rod 207 to rotate, and the mounting plate 209 is driven to move up and down along the side inner wall of the mounting tube 204 through the thread, and the position of the mounting plate 209 is adjusted, thereby adjusting the shape of the pressure spring 211. Variable, controls the pressure of the pressure spring 211 on the sealing piston 212. After the adjustment is completed, release the knob 203, and the mounting ring 215 pulls the knob 203 downward to make the first clamping block 221 move downward and clamp into the first clamping groove 218 to fix the knob 203, thereby fixing the threaded rod 207. When the circuit breaker is used, an arc is generated to heat the nylon gas-generating material inside the sealing box 201 to generate gas, and the internal pressure of the sealing box 201 increases, so that the sealing piston 212 moves upward. When the internal pressure of the sealing box 201 reaches a certain value, the sealing piston 212 moves to the top of the exhaust pipe 202. At the same time, the top of the sealing piston 212 contacts the touch switch 210, so that the touch switch 210 controls the surface indicator light of the circuit breaker to emit green light, indicating that the sealing box 201 is normally spraying gas, and the gas is sprayed from the exhaust pipe 202 to blow the arc to the surface of the insulating grid 304. The arc is lengthened and the heat is quickly transferred out for heat dissipation. When the internal pressure of the sealing box 201 is insufficient and the top of the sealing piston 212 cannot contact the touch switch 210, the touch switch 210 controls the indicator light on the surface of the circuit breaker to emit a red light, indicating that the sealing piston 212 cannot move to the top of the exhaust pipe 202, so that the gas inside the sealing box 201 cannot be ejected normally, and timely processing is required.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An arc extinguishing device for a molded case circuit breaker, comprising an arc extinguishing chamber (1), characterized in that: Also includes: A blower mechanism (2) and an arc extinguishing cover mechanism (3), the side of the arc extinguishing chamber (1) being fixedly connected to the side of the blower mechanism (2), the side of the arc extinguishing chamber (1) being fixedly connected to the side of the arc extinguishing cover mechanism (3), the blower mechanism (2) comprising a sealing box (201), the sealing box (201), the side of the sealing box (201) being fixedly connected to the side of the arc extinguishing chamber (1), the inside of the sealing box (201) being filled with nylon gas-generating material, the side inner wall of the sealing box (201) being fixedly connected to a mounting tube (204), the side of the mounting tube (204) being fixedly connected to an exhaust The mounting tube (202) is provided with a through hole (214) at the bottom end of the mounting tube (204); the top end of the sealing box (201) is movably sleeved with a threaded rod (207); the side of the threaded rod (207) is threadedly connected with a mounting plate (209); the bottom end of the mounting plate (209) is fixedly connected with a pressure spring (211); the bottom end of the pressure spring (211) is fixedly connected with a sealing piston (212); the side of the sealing piston (212) is fixedly connected with a sealing ring (213); the side of the sealing ring (213) is movably connected to the inner wall of the side of the mounting tube (204).

2. The arc extinguishing device for a molded case circuit breaker according to claim 1, characterized in that: A limiting groove (208) is provided on the inner wall of the side of the installation cylinder (204); a limiting block is fixedly connected to the side of the installation plate (209) corresponding to the position of the limiting groove (208); and the side of the limiting groove (208) is movably connected to the side of the limiting block.

3. The arc extinguishing device for a molded case circuit breaker according to claim 2, characterized in that: The top of the sealing box (201) is provided with a first installation groove (217), the side of the first installation groove (217) is movably connected to a knob (203), the inner wall of the top of the knob (203) is fixedly connected to a first clamping block (221), the bottom of the first clamping block (221) is fixedly connected to a second clamping block (220), the top of the sealing box (201) is provided with a first clamping groove (218), the side of the first clamping groove (218) is meshed with the side of the first clamping block (221), and the top of the threaded rod (207) is provided with a second clamping groove (219), the side of the second clamping groove (219) is meshed with the side of the second clamping block (220).

4. The arc extinguishing device for a molded case circuit breaker according to claim 3, characterized in that: The top inner wall of the knob (203) is movably sleeved with a mounting ring (215), the bottom end of the mounting ring (215) is fixedly connected with a tension spring (216), and the bottom end of the tension spring (216) is fixedly connected to the top of the sealing box (201).

5. The arc extinguishing device for a molded case circuit breaker according to claim 2, characterized in that: The bottom end of the threaded rod (207) is fixedly connected to a touch switch (210), the top end of the sealing piston (212) is fixedly connected to a first protective shell (205), the side of the first protective shell (205) is movably connected to a second protective shell (206), and the top end of the second protective shell (206) is fixedly connected to the bottom end of the mounting plate (209).

6. The arc extinguishing device for a molded case circuit breaker according to claim 1, characterized in that: The arc extinguishing cover mechanism (3) comprises a mounting shell (301), the side surface of the mounting shell (301) is fixedly connected to the side surface of the arc extinguishing chamber (1), a second mounting groove (303) is provided on the inner wall of the side surface of the mounting shell (301), an insulating grid (304) is movably connected to the side surface of the second mounting groove (303), a limiting platform (305) is provided on the side surface of the insulating grid (304), a fixing bar (307) is fixedly connected to the side surface of the mounting shell (301) via a screw nail (302), and a side surface of the fixing bar (307) is movably connected to the side surface of the insulating grid (304).

7. The arc extinguishing device for a molded case circuit breaker according to claim 6, characterized in that: The top of the insulating grid (304) is provided with an arc surface (306).

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