Breaking device

Abstract

The present invention provides a breaking device, comprising a static contact, a moving contact, a pull rod, a first cylinder, a second cylinder, an air pipe, and a piston, wherein the second cylinder is fastened to a bracket; the first cylinder is airtightly sleeved within the second cylinder and moves synchronously with the pull rod and the moving contact; a piston is disposed within the second cylinder; the first cylinder, the second cylinder, and the piston enclose a first air chamber; a second air chamber is formed between the piston and the bottom of the second cylinder; during the opening process of the breaking device, the first cylinder contacts and squeezes the piston, compressing the gas in the second air chamber; one end of the air pipe is connected to the second air chamber, and the other end is aligned with the arc zone. The present invention cleverly utilizes the gas in the compressed air chamber to extinguish the arc by providing an air chamber and then separating the moving and static contacts. Horizontal arc extinguishing is achieved through the conduit, effectively improving arc extinguishing efficiency.

Description

Technical Field

[0001] The present invention relates to the field of high-voltage electrical appliance disconnection, and in particular to a disconnecting device. Background Art

[0002] During the breaking process, after the moving arc contact and the static arc contact are separated, an arc will be generated due to the high voltage. The basic principle of the current traditional circuit breaker's breaking device is to compress the gas in the cylinder and blow out the arc through the nozzle. The gas and the arc are in the same direction, which is not conducive to lengthening the arc. If the arc can be lengthened, the arc resistance is increased, and the heat dissipation is enhanced, the arc can be extinguished as soon as possible.

[0003] The invention patent CN106710960B discloses a gas circuit breaker with enhanced insulation recovery function, in which an expansion chamber, a compressed air chamber, a main nozzle, an auxiliary nozzle, a moving side arc contact and a static side arc contact constitute the core components of the arc interruption; the arc extinguishing chamber gas insulation recovery consists of an inner mixing zone and an outer mixing zone; the guide tube drainage hole draws the insulating gas from the outer mixing zone of the arc extinguishing chamber into the inner mixing zone of the arc extinguishing chamber, and performs the first stage mixing and cooling with the high-temperature arc gas in the area closest to the fracture; the support seat drainage hole draws the insulating gas outside the arc extinguishing chamber into the outer mixing zone of the arc extinguishing chamber, and performs the second stage mixing and cooling with the arc gas; the spoiler at the exhaust port reduces the local velocity of the discharged high-temperature mixed gas; a pressure balance hole is opened on the main contact shielding cover to reduce the pressure difference on both sides of the shielding cover; and a pressure balance hole is opened on the insulating tube to reduce the gas pressure fluctuation inside the insulating tube. The arc extinguishing area of ​​the above solution is also provided with an insulating cylinder, but the insulating cylinder is not sealed to form an air chamber. Instead, a pressure balance hole 11 is provided on the insulating cylinder 10 to form an air flow path A3. In contrast, in this patent, the gas is blown laterally toward the arc zone through an air guide pipe.

[0004] Patent document KR102105437B1 discloses a circuit breaker for gas-insulated switchgear with increased electrode contact grip. This solution relates to a circuit breaker for gas-insulated switchgear that effectively cools arc heat generated when contacts open, preventing deterioration of the insulation breakdown capability of the insulating gas and, in particular, preventing backflow of the insulation. By enhancing the sealing performance between the pressure chamber and the heating chamber, a safe and stable blocking function is implemented, increasing the convenience of switching operations, enabling manual operation, improving the contact grip of finger contacts, and blocking the problem of conductive faults, thereby increasing the electrode contact grip and resolving the risk of safety accidents.

[0005] In the above solution, the arc extinguishing part includes two gas chambers, namely the pressure chamber and the heating chamber. However, the above solution does not provide an air guide tube structure, nor does it introduce the gas in the pressure chamber into the arc zone through the air guide tube.

[0006] The invention patent CN104979132B discloses a gas-insulated circuit breaker, comprising: a fixed contact having a cavity formed therein; a fixed arc contact disposed in the cavity of the fixed contact; a fixed side conductor disposed to surround the fixed contact, and the fixed side conductor configures a gap between the fixed side conductor and the fixed contact as a discharge path for insulating gas; a movable contact having a cavity formed therein; a movable arc contact disposed in the cavity of the movable contact; a movable side conductor disposed to surround the movable contact, and the movable side conductor configures a gap between the movable side conductor and the movable contact as a discharge path for insulating gas; a first extension portion formed on the fixed side conductor and extending the discharge path of the fixed side conductor for insulating gas; and a second extension portion formed on the movable side conductor and extending the discharge path of the movable side conductor for insulating gas. The above solution is to accelerate the discharge of insulating gas by providing expansion zones (135, 165) on the moving side and the stationary side respectively. However, the present proposal is to guide the insulating gas in the second gas chamber to the arc zone through the gas guide tube to achieve the effect of horizontal arc blowing. Summary of the Invention

[0007] In view of the defects in the prior art, an object of the present invention is to provide a disconnecting device.

[0008] According to the present invention, a breaking device is provided, comprising a static contact 2, a moving contact 3, a pull rod 13, a first cylinder 10, a second cylinder 11, an air pipe 7 and a piston 12, wherein:

[0009] The second cylinder 11 is fastened to the bracket 9;

[0010] The first cylinder 10 is airtightly sleeved in the second cylinder 11 and moves synchronously with the pull rod 13 and the moving contact 3;

[0011] A piston is provided in the second cylinder 11; the first cylinder 10, the second cylinder 11 and the piston 12 enclose a first air chamber 5; a second air chamber 6 is formed between the piston 12 and the bottom of the second cylinder 11;

[0012] During the opening process of the breaking device, the first cylinder 10 contacts and squeezes the piston 12, compressing the gas in the second air chamber 6;

[0013] One end of the air pipe 7 is connected to the second air chamber 6 , and the other end is laterally aligned with the arc zone.

[0014] Preferably, the static contact 2, the moving contact 3 and the pull rod 13 are coaxially arranged; the static contact 2 is mounted on the base 1; the moving contact 3 is mounted on the end of the pull rod 13, and the pull rod 13 reciprocates along the axial direction, driving the moving contact 3 to contact or separate from the static contact 2.

[0015] Preferably, in the closed position, the static contact 2 extends into the first cylinder 10 and is inserted into the moving contact 3 ; the static contact 2 , the first cylinder 10 , the second cylinder 11 and the piston 12 enclose a sealed first air chamber 5 .

[0016] Preferably, during the opening process, the gas in the first air chamber 5 is compressed; when the static contact 2 is separated from the nozzle 4 of the first cylinder 10 , the compressed gas in the first air chamber 5 flows out through the nozzle 4 .

[0017] Preferably, the air outlet of the air pipe 7 faces the area between the static contact 2 and the moving contact 3 .

[0018] Preferably, the pull rod 13 passes through the first cylinder 10 , has the moving contact 3 installed at one end and is disposed in the first air chamber 5 , and the other end is an operating end.

[0019] Preferably, the interior of the pull rod 13 is hollow, and a through hole 14 is provided on a side of the pull rod 13 away from the moving contact 3 .

[0020] Preferably, the air inlet end of the air pipe 7 is connected to the second air chamber 6 at an inclined angle.

[0021] Preferably, the static contact 2 includes a static contact chromium-copper part 202 and a static contact copper-tungsten part 201, wherein the static contact chromium-copper part 202 is the body of the static contact 2; the static contact copper-tungsten part 201 is arranged at the end of the static contact 2;

[0022] The movable contact 3 includes a movable contact chromium-copper part 302 and a movable contact copper-tungsten part 301 , wherein the movable contact chromium-copper part 302 is the body of the movable contact 3 ; the movable contact copper-tungsten part 301 is arranged at the end of the movable contact 3 .

[0023] Preferably, the piston 12 and the pull rod 13 , and the second cylinder 11 and the pull rod 13 are airtightly connected.

[0024] Preferably, the piston 12 is connected to the bottom of the second cylinder 11 via a spring 8 , dividing the second cylinder 11 into a first air chamber 5 and a second air chamber 6 .

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention has reasonable structure, ingenious design and remarkable effect.

[0027] 2. The present invention sets up an air chamber, separates the moving and static contacts, and cleverly utilizes the gas in the compressed air chamber to extinguish the arc.

[0028] 3. Compared with the traditional gas longitudinal arc extinguishing method, the present invention cleverly uses the conduit to achieve horizontal arc extinguishing, effectively improving the arc resistance, enhancing heat dissipation, and achieving arc extinguishing as quickly as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0030] Figure 1 It is a structural diagram of the breaking device in the closed state.

[0031] Figure 2 This is a structural diagram of the breaking device in the first opening stage.

[0032] Figure 3 This is a structural diagram of the breaking device in the second opening stage.

[0033] Figure 4 This is a structural diagram of the breaking device in the third stage.

[0034] The figure shows: 1-base; 2-static contact; 201-static contact copper-tungsten part; 202-static contact chromium-copper part; 3-moving contact; 301-moving contact copper-tungsten part; 302-moving contact chromium-copper part; 4-nozzle; 5-first air chamber; 6-second air chamber; 7-air pipe; 8-spring; 9-bracket; 10-first cylinder; 11-second cylinder; 12-piston; 13-pull rod; 14-through hole. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0036] like Figures 1 to 4As shown, a breaking device provided according to the present invention includes a static contact 2, a moving contact 3, a pull rod 13, a first cylinder 10, a second cylinder 11, an air pipe 7 and a piston 12, wherein: the second cylinder 11 is fastened to the bracket 9; the piston 12 is connected to the bottom of the second cylinder 11 through a spring 8, dividing the second cylinder 11 into a first air chamber 5 and a second air chamber 6; the first cylinder 10, the second cylinder 11 and the piston 12 enclose a first air chamber 5; a second air chamber 6 is formed between the piston 12 and the bottom of the second cylinder 11; the first cylinder 10 is arranged in the second cylinder 11 and moves synchronously with the pull rod 13 and the moving contact 3; the pull rod 13 passes through the second air chamber 6 and extends into the first air chamber 5; after the pull rod 13 moves to a certain distance, the first cylinder 10 contacts and squeezes the piston 12, compressing the gas in the second air chamber 6; one end of the air pipe 7 is connected to the second air chamber 6, and the other end is horizontally aligned with the arc zone. The air outlet of the air pipe 7 faces the area between the static contact 2 and the moving contact 3, and the air outlet direction is perpendicular or approximately perpendicular to the axial direction of the static contact 2. The air inlet end of the air pipe 7 is connected to the second air chamber 6 at an inclined angle, which facilitates the discharge of compressed gas.

[0037] The static contact 2, movable contact 3, and pull rod 13 are coaxially arranged. The static contact 2 is mounted on the base 1, and the movable contact 3 is mounted at the end of the pull rod 13. The pull rod 13 reciprocates along its axis, driving the movable contact 3 into and out of contact with the static contact 2. The pull rod 13 passes through the first cylinder 10. One end of the pull rod 13 is mounted with the movable contact 3 and is located within the first air chamber 5. The other end serves as the operating end. The interior of the pull rod 13 is hollow, and a through hole 14 is provided on the side of the pull rod 13 facing away from the movable contact 3.

[0038] In the closed position, the static contact 2 extends into the first cylinder 10 and inserts into the moving contact 3. The static contact 2, first cylinder 10, second cylinder 11, and piston 12 enclose a sealed first air chamber 5. During the opening process, the gas in the first air chamber 5 is compressed. When the static contact 2 is released from the nozzle 4 of the first cylinder 10, the compressed gas in the first air chamber 5 flows out through the nozzle 4.

[0039] The static contact 2 includes a static contact chromium-copper part 202 and a static contact copper-tungsten part 201, wherein the static contact chromium-copper part 202 is the body of the static contact 2; the static contact copper-tungsten part 201 is arranged at the end of the static contact 2; the moving contact 3 includes a moving contact chromium-copper part 302 and a moving contact copper-tungsten part 301, wherein the moving contact chromium-copper part 302 is the body of the moving contact 3; the moving contact copper-tungsten part 301 is arranged at the end of the moving contact 3.

[0040] The piston 12 and the pull rod 13 are connected airtightly, and the second cylinder 11 and the pull rod 13 are connected airtightly. The first cylinder 10 and the second cylinder 11 are connected airtightly to ensure sealing.

[0041] In more detail, in the present invention, the air pipe 7 is connected to the second air chamber 6, and the piston 12 in the second air chamber 6 and the bracket 9 are connected by a spring 8; when the piston 12 in the second air chamber 6 is compressed, the internal gas can flow out along the air pipe 7 and blow toward the arc zone through the air pipe 7; the static contact 2 is connected to the base 1; the pull rod 13 is connected to the first cylinder 10, the nozzle 4, and the moving contact 3, and can move horizontally; the bracket 9 is connected to the second cylinder 11 and is fixed in position; the first air chamber 5 is Surrounded by the piston 12, the first cylinder 10, and the second cylinder 11, air can flow out from between the nozzle 4 and the moving arc contact; the static contact 2 consists of two parts: the static contact chromium-copper part 202 and the static contact copper-tungsten part 201, of which the static contact copper-tungsten part 201 is at the end; the moving contact 3 consists of two parts: the moving contact chromium-copper part 302 and the moving contact copper-tungsten part 301, of which the moving contact copper-tungsten part 301 is at the end; the pull rod 13 is hollow inside, and has a hole at the end away from the moving contact 3, so it can move in the horizontal direction.

[0042] The working principle of the present invention is as follows: First, in the closed state, the static contact 2 is inserted into the moving contact 3, and the chrome tube part of the static contact 2 and the chrome tube part of the moving contact 3 are in contact, and the conductivity is good. Figure 2 As shown, the pull rod 13 drives the moving contact 3 to move to the right, and the copper-tungsten portion 301 of the moving contact contacts the copper-tungsten portion 201 of the static contact. Figure 3 As shown, the pull rod 13 continues to move to the right, the gas in the first air chamber 5 is compressed and flows out of the pull rod 13 through the nozzle 4. The first cylinder 10 and the piston 12 have not yet come into contact, and the piston 12 is stationary. Figure 4 As shown, when the first cylinder 10 contacts the piston 12, the piston 12 is squeezed by the first cylinder 10, compressing the spring 8. The gas in the second chamber 6 is compressed and flows out of the air pipe 7, blowing the arc. The arc stretches downward, the arc length increases, the arc resistance increases, the heat is dissipated, and the arc is eventually extinguished, ending the opening process. When closing the circuit breaker, the spring 8 recovers and the piston 12 returns to its original position.

[0043] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0044] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A breaking device, characterized in that: It comprises a static contact (2), a moving contact (3), a pull rod (13), a first cylinder (10), a second cylinder (11), an air pipe (7) and a piston (12), wherein: The second cylinder (11) is fastened to the bracket (9); The first cylinder (10) is airtightly sleeved in the second cylinder (11) and moves synchronously with the pull rod (13) and the moving contact (3); A piston is provided in the second cylinder (11); the first cylinder (10), the second cylinder (11) and the piston (12) enclose a first air chamber (5); a second air chamber (6) is formed between the piston (12) and the bottom of the second cylinder (11); During the opening process of the breaking device, the first cylinder (10) contacts and squeezes the piston (12), compressing the gas in the second air chamber (6); One end of the air pipe (7) is connected to the second air chamber (6), and the other end is aligned with the arc zone to achieve horizontal arc extinguishing; The static contact (2), the moving contact (3) and the pull rod (13) are coaxially arranged; the static contact (2) is mounted on the base (1); the moving contact (3) is mounted on the end of the pull rod (13); the pull rod (13) reciprocates along the axial direction, driving the moving contact (3) to contact or separate from the static contact (2); In the closed position, the static contact (2) extends into the first cylinder (10) and is inserted into the moving contact (3); the static contact (2), the first cylinder (10), the second cylinder (11) and the piston (12) enclose a sealed first air chamber (5); During the opening process, the gas in the first air chamber (5) is compressed; when the static contact (2) is separated from the nozzle (4) of the first cylinder (10), the compressed gas in the first air chamber (5) flows out through the nozzle (4).

2. The breaking device according to claim 1, characterized in that: The air outlet of the air pipe (7) faces the area between the static contact (2) and the moving contact (3).

3. The breaking device according to claim 1, characterized in that: The pull rod (13) passes through the first cylinder (10), has a moving contact (3) installed at one end and is arranged in the first air chamber (5), and the other end is an operating end.

4. The breaking device according to claim 1, characterized in that: The interior of the pull rod (13) is hollow, and a through hole (14) is provided on the side of the pull rod (13) away from the moving contact (3).

5. The breaking device according to claim 1, characterized in that: The air inlet end of the air pipe (7) is connected to the second air chamber (6) at an inclined angle.

6. The breaking device according to claim 1, characterized in that: The piston (12) and the pull rod (13), and the second cylinder (11) and the pull rod (13) are connected in an airtight manner.

7. The breaking device according to claim 1, characterized in that: The piston (12) is connected to the bottom of the second cylinder (11) via a spring (8), dividing the second cylinder (11) into a first air chamber (5) and a second air chamber (6).

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