Unit pole of double-breakpoint switch

Abstract

A unit pole of a double-breakpoint switch belongs to the technical field of low-voltage electric appliances. Comprising a shell, static contacts, a bridge-type moving contact, an arc extinguish chamber and a rotating shaft, the static contacts, the bridge-type moving contact, the arc extinguish chamber and the rotating shaft are located in the shell, the bridge-type moving contact is installed in the rotating shaft and comprises a pair of moving contact arms which extend out of the rotating shaft in a back-to-back mode, the static contacts are in a flat plate shape and are arranged on the top wall and the bottom wall in the shell respectively, and the arc extinguish chamber is arranged in the shell. The arc extinguish chambers are arranged in the shell and are in contact fit with the movable contact arms respectively, the movable contact arms form a < shape when making contact with the static contact, and the arc extinguish chambers are located on the left side and the right side in the shell respectively. The arc extinguish chamber has the advantages that the space occupied by the static contact in the shell is reduced, so that the space for placing the arc extinguish chamber can be increased, the arc extinguish chamber can obtain a larger space in the array direction of the grid sheets, more grid sheets can be stacked, the arc voltage can be improved, and the arc can be extinguished quickly; and meanwhile, the requirement of high-voltage breaking is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low voltage electrical apparatus technical field, concretely relates to a unit pole of double-break switch. BACKGROUND

[0002] Switch is a very important kind of electrical apparatus in power supply and distribution circuit, can cut off the current to realize the disconnection of circuit, specifically, it is through the closing or separation of a pair of separable contact of contact system to realize the connection or disconnection of circuit to protect the circuit and electrical equipment.

[0003] The contact system of switch includes moving contact and static contact, moving contact contacts or separates with static contact after action, and then makes the switch itself realize conduction or disconnection. As known in the industry, when the switch breaks, electric arc will be generated between moving contact and static contact, and the electric arc energy is relatively large, which causes great difficulty to the switch breaking. In view of this, the switch usually further includes an arc extinguishing chamber for extinguishing the electric arc generated when the moving contact separates from the static contact. The electric arc enters the inside of the arc extinguishing chamber under the joint action of magnetic blowing force and gas blowing force, is cut into a plurality of series short arcs by the grid piece, so as to improve the arc voltage and make the electric arc extinguish. Only when the electric arc is extinguished, the circuit is disconnected. The role of the arc extinguishing chamber in ensuring the safe operation of electrical equipment is beyond doubt.

[0004] With the development of new energy, the application scenarios of high voltage are more and more. In order to meet the market demand, the switch itself needs to meet the requirements of higher voltage, and the arc extinguishing chamber as a functional component for extinguishing electric arc in switch electrical apparatus needs to meet the requirements of higher voltage to be extinguished. In order to extinguish the electric arc of higher voltage, the arc extinguishing chamber needs to improve the arc voltage when the electric arc enters the grid piece group inside the arc extinguishing chamber. Therefore, it is urgent to increase the stacking number of grid pieces to effectively improve the arc voltage, and then make the electric arc extinguish quickly.

[0005] Figure 1 The unit pole of the existing double-break switch is illustrated, which usually includes static contact 1, moving contact 2, arc extinguishing chamber 3 and rotating shaft 4, wherein the static contact 1 has a pair, the moving contact 2 is of bridge type structure, including two moving contact arms extending away from each other, and a moving contact point is arranged on each moving contact arm, the moving contact 2 is installed on the rotating shaft 4 and can rotate with the rotating shaft 4 to realize the contact or closing with the pair of static contact 1. The arc extinguishing chamber 3 is installed on the side of the opening direction of the moving contact 2 and the static contact 1. The defects existing in the existing structure are that, since the end of the static contact 1 matched with the moving contact 2 adopts U-shaped structure and occupies the accommodation space of the arc extinguishing chamber 3, the stacking number of the grid pieces in the arc extinguishing chamber 3 is limited, which further affects the arc extinguishing effect.

[0006] In view of the above prior art, the applicant has made beneficial design, and the technical scheme to be introduced below is generated in this background. Utility model content

[0007] The utility model discloses a kind of unit poles of double-break switch, static contact is flat plate type, relative to U-shaped configuration, the space occupied by static contact in shell is reduced, the array length of the grid piece inside arc-extinguishing chamber is expanded in turn, so as to facilitate accommodate more grid piece, and because the current direction in static contact is towards arc-extinguishing chamber, electric repulsion that push into arc-extinguishing chamber can be generated to arc.

[0008] The utility model discloses a kind of unit poles of double-break switch, static contact is flat plate type, relative to U-shaped configuration, the space occupied by static contact in shell is reduced, the array length of the grid piece inside arc-extinguishing chamber is expanded in turn, so as to facilitate accommodate more grid piece, and because the current direction in static contact is towards arc-extinguishing chamber, electric repulsion that push into arc-extinguishing chamber can be generated to arc.

[0009] In one specific embodiment of the utility model, the shell includes a pair of sub-shells arranged face to face, and a receiving cavity is formed between the pair of sub-shells for accommodating the static contact, the bridge-type moving contact, the arc-extinguishing chamber and the rotating shaft.

[0010] In another specific embodiment of the utility model, the bridge-type moving contact is provided with a moving contact point on the side surface of each moving contact arm facing the static contact, and each static contact is provided with a static contact point corresponding to the moving contact point, and the static contact point is in contact with the moving contact point.

[0011] In yet another specific embodiment of the utility model, the arc-extinguishing chamber includes a plurality of arrayed grid pieces and a pair of insulating arc separation covers, each grid piece includes a cutting zone and a pair of grid piece legs symmetrically extending from both ends of the cutting zone to the same side, and each of the pair of insulating arc separation covers is sleeved on a grid piece leg.

[0012] In still another specific embodiment of the utility model, the grid pieces are arrayed in the up-down direction.

[0013] In another specific embodiment of this utility model, the insulating arc-shielding cover includes an insertion groove, an outer wall, an inner wall, and spacer ribs. The inner wall and the outer wall are spaced apart from each other. After the insulating arc-shielding cover is inserted into the pair of grid legs, the inner wall is located inside the pair of grid legs, while the outer wall is located outside the pair of grid legs. The spacer ribs are connected between the inner wall and the outer wall. There are multiple spacer ribs, which are spaced apart. The insertion groove is formed between adjacent spacer ribs.

[0014] In a further specific embodiment of this utility model, the height of the inner wall is greater than the height of the outer wall.

[0015] In a further specific embodiment of this utility model, a notch is formed between the pair of grid legs. The notch forms a locking notch on the edge of the cutting area on the same side as the pair of grid legs and near the inner side of the pair of grid legs. The locking notch is used to mate with the inner wall of the insulating arc shield.

[0016] In another specific embodiment of this utility model, the grid plate has a pair of insertion edges formed on the side opposite to the pair of grid plate legs on the cutting area. The pair of insertion edges are located at both ends in the length direction of the cutting area. The inner wall of the housing has slots that cooperate with the insertion edges for each grid plate. Each grid plate is installed and positioned inside the housing by interlocking the insertion edges with the slots.

[0017] In yet another specific embodiment of this utility model, an arc-inducing bending portion is provided on a grid plate at the end of the moving contact arm. When the bridge-type moving contact is in the open position, the arc-inducing bending portion is located between a pair of grid plate legs.

[0018] In this invention, the stationary contact adopts a flat plate shape, which reduces the space occupied by the stationary contact within the housing compared to the U-shaped structure in the prior art. This increases the space for placing the arc-extinguishing chamber, allowing the arc-extinguishing chamber to have more space in the array direction of its grid plates, enabling the stacking of more grid plates, thereby improving the arc voltage and extinguishing the arc quickly. Simultaneously, this structure also expands the gap between the stationary contact and the bridge-type moving contact, which is beneficial for high-voltage breaking requirements. Furthermore, when the moving contact arm contacts a stationary contact, it forms a "∠" shape, ensuring that the electro-repulsive force generated on the stationary contact side propels the arc into the arc-extinguishing chamber. The relatively long length of the flat plate stationary contact also maximizes this electro-repulsive force. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the unit poles of an existing double-break switch;

[0020] Figure 2 It is the unit pole's three-dimensional schematic view of the double-break switch;

[0021] Figure 3 It is the internal structure schematic view of the unit pole of the double-break switch;

[0022] Figure 4 It is the structure schematic view of the arc extinguishing chamber;

[0023] Figure 5 It is the structure schematic view of the arc insulation cover.

[0024] In the figure: 1. static contact, 11. static contact point; 2. bridge type moving contact, 21. moving contact arm, 211. moving contact point; 3. arc extinguishing chamber, 31. grid, 311. cutting area, 312. grid leg, 313. clamping gap, 314. plug-in edge, 32. arc insulation cover, 321. insertion slot, 322. outer wall, 323. inner wall, 324. spacing rib, 33. gap; 4. rotating shaft; 100. shell, 101. sub-shell. DETAILED DESCRIPTION

[0025] The specific embodiments of the utility model will be described in detail below in combination with the drawings, but the description of the embodiments is not the limitation of the technical scheme, and any formal but not substantial changes according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0026] In the following description, the concepts of directionality (or directionality) of up, down, left, right, front and back are all for the position state of the figure being described, and the purpose is to facilitate the public to understand, so it cannot be understood as the special limitation of the technical scheme provided by the utility model.

[0027] As shown in Figure 2 and Figure 3 The utility model relates to a kind of double-break switches, the double-break switch includes at least two unit poles, the double-break switch includes two unit poles if it is two poles, includes three unit poles if it is three poles.

[0028] The unit pole forms an assembly, each unit pole comprising a shell 100, and a static contact 1, a bridge type moving contact 2, an arc extinguishing chamber 3 and a rotating shaft 4 inside the shell 100. The double-break switch further comprises a mechanism (not shown), a handle (not shown), a tripper (not shown) and the like. When the switch is manually operated, the operator pushes the handle to drive the mechanism to move, and the rotating shaft 4 is driven to rotate by the mechanism. When the switch is tripped, the tripper triggers the mechanism to drive the rotating shaft 4. The bridge type moving contact 2 is installed inside the rotating shaft 4 and rotates with the rotating shaft 4 to realize contact or separation with the static contact 1, thereby realizing conduction or disconnection of the switch itself.

[0029] The shell 100 comprises a pair of sub-shells 101 which are spliced face to face, and a receiving cavity is formed between the pair of sub-shells 101, in which the static contact 1, the bridge type moving contact 2, the arc extinguishing chamber 3 and the rotating shaft 4 are accommodated and positioned. The rotating shaft 4 is centrally arranged in the receiving cavity, and the bridge type moving contact 2 comprises a pair of moving contact arms 21 which extend away from each other to the outside of the rotating shaft 4 and are 180º symmetrical about the rotation center of the bridge type moving contact 2. The static contact 1 is a flat plate type and has a pair of static contacts 1 which are arranged on the top wall and the bottom wall inside the shell 100 respectively. Each moving contact arm 21 is provided with a moving contact point 211 on the side of the rotating end facing the static contact 1, and each static contact 1 is provided with a static contact point 11 corresponding to the moving contact point 211, which is in contact with the moving contact point 211.

[0030] Specifically, based on the direction of the figure, Figure 3 the static contact 1 at the bottom extends from the left side to the right side and cooperates with the moving contact arm 21 on the right side, and the static contact 1 at the bottom is provided with the static contact point 11 at the right end and is used for outgoing line at the left end. Correspondingly, the static contact 1 at the top extends from the right side to the left side and cooperates with the moving contact arm 21 on the left side, and the static contact 1 at the top is provided with the static contact point 11 at the left end and is used for outgoing line at the right end. The moving contact arm 21 forms an "∠" shape when it contacts with a static contact 1. The "∠" shape specifically refers to the included angle formed by a static contact 1 and a moving contact arm 21 corresponding thereto when they are in the open position. The static contact 1 and the moving contact arm 21 corresponding thereto are both arranged to extend to the side of the arc extinguishing chamber 3. This arrangement ensures that the electrodynamic repulsion generated on the side of the static contact 1 pushes the arc into the arc extinguishing chamber 3. Moreover, since the static contact 1 has a relatively long length in the present scheme, the electrodynamic repulsion is also maximized.

[0031] Continued from Figure 3The arc-extinguishing chambers 3 are also in pairs, located on the left and right sides inside the housing 100 respectively, and are configured to cooperate with the bridge-type moving contact 2 and the stationary contact 1. Specifically, the arc generated when the right moving contact arm 21 separates from the stationary contact 1 located at the bottom enters the right arc-extinguishing chamber 3; while the arc generated when the left moving contact arm 21 separates from the stationary contact 1 located at the top enters the left arc-extinguishing chamber 3. An outlet is provided on the side of the housing 100 corresponding to the arc-extinguishing chamber 3 away from the stationary contact 1 and the bridge-type moving contact 2, and the outlet is used to release the high-temperature gas from the arc.

[0032] like Figure 4 As shown, the arc-extinguishing chamber 3 includes multiple arrays of grid plates 31 and a pair of insulating arc-blocking covers 32. The grid plates 31 include a cutting area 311 and a pair of grid plate legs 312 that extend symmetrically from both ends of the cutting area 311 along the length direction to the same side. The pair of insulating arc-blocking covers 32 are respectively sleeved on a grid plate leg 312.

[0033] A notch 33 is formed between the pair of grid legs 312. Within the notch, locking notches 313 are formed on the edge of the cutting area 311 on the same side as the pair of grid legs 312 and near the inner side of the pair of grid legs 312. The locking notches 313 are used to cooperate with the insulating arc-shielding cover 32. A pair of insertion edges 314 are formed on the edge of the cutting area 311 on the opposite side of the pair of grid legs 312. The pair of insertion edges 314 are located at both ends of the length direction of the cutting area 311. The inner wall of the housing 100 has slots corresponding to each grid 31 that cooperate with the insertion edges 314. Each grid 31 is installed and positioned inside the housing 100 by the insertion of the insertion edges 314 into the slots.

[0034] Preferably, the grid plates 31 are arranged in a vertically spaced array. When the bridge-type moving contact 2 is in the open position, an arc-inducing bending portion is provided on one of the grid plates 31 at the end of the moving contact arm 21, and the arc-inducing bending portion is located between a pair of grid plate legs 312.

[0035] like Figure 5As shown, the arc insulation cover 32 is generally made of thermoplastic material, including an insertion slot 321, an outer wall 322, an inner wall 323 and a spacing rib 324, the inner wall 323 and the outer wall 322 extend in the up-down direction and are spaced from each other. Specifically, after the arc insulation cover 32 is inserted into the pair of grid legs 312, the inner wall 323 is located on the inner side of the pair of grid legs 312 and is inserted into the clamping gap 313, and the outer wall 322 is located on the outer side of the pair of grid legs 312. Preferably, the height of the inner wall 323 is greater than the height of the outer wall 322. The spacing rib 324 is connected between the inner wall 323 and the outer wall 322, and the spacing rib 324 is multiple and spaced, and the insertion slot 321 is formed between adjacent spacing ribs 324. The number of spacing ribs 324 is one more than the number of insertion slots 321, so that each insertion slot 321 is surrounded by the inner wall 323, the outer wall 322 and the adjacent two spacing ribs 324.

[0036] In the utility model, since the static contact 1 adopts the flat plate type, it does not occupy too much space in the shell 100, thereby increasing the space for placing the arc extinguishing chamber 3, so that the arc extinguishing chamber 3 can obtain more space in the array direction of the grid sheet 31, thereby accommodating more grid sheets 31. Meanwhile, the structure also expands the opening angle between the static contact 1 and the bridge type moving contact 2, which is beneficial to the demand of high voltage breaking. Secondly, the dynamic contact arm 21 forms an angle when contacting the static contact 1, so that the electrodynamic repulsion generated on the side of the static contact 1 pushes the arc into the arc extinguishing chamber 3, and the flat plate type static contact 1 has a longer length, which also ensures the maximization of the electrodynamic repulsion.

Claims

1. A unit pole of a double-break switch, comprising a housing (100), a stationary contact (1), a bridge-type movable contact (2), an arc-extinguishing chamber (3) and a rotating shaft (4) located inside the housing (100), the bridge-type movable contact (2) being installed inside the rotating shaft (4) and comprising a pair of movable contact arms (21) extending away from each other to the outside of the rotating shaft (4), characterized in that: The static contact (1) is a flat plate type and has a pair, and the pair of static contacts (1) are arranged on the top wall and the bottom wall inside the shell (100) respectively, and are in contact with a pair of movable contact arms (21) respectively, the movable contact arm (21) forms an angle when it is in contact with a static contact (1), and the arc extinguishing chamber (3) is also a pair, which is located on the left and right sides inside the shell (100).

2. A single pole unit of a double-break switch according to claim 1, characterized in that: The shell (100) comprises a pair of sub-shells (101) arranged face to face, and a containing cavity is formed between the pair of sub-shells (101) for containing the static contact (1), the bridge type movable contact (2), the arc extinguishing chamber (3) and the rotating shaft (4).

3. A single pole unit of a double-break switch according to claim 1, characterized in that: The bridge type movable contact (2) is provided with a movable contact point (211) on the side of the rotating end of each movable contact arm (21) facing the static contact (1), and each static contact (1) is provided with a static contact point (11) corresponding to the movable contact point (211), and the static contact point (11) is in contact with the movable contact point (211); the static contact (1) at the bottom extends from the left to the right and cooperates with the movable contact arm (21) on the right, and the static contact (1) at the top extends from the right to the left and cooperates with the movable contact arm (21) on the left.

4. A single pole unit of a double-break switch according to claim 1, characterized in that: The arc extinguishing chamber (3) comprises a plurality of arrays of grid fins (31) and a pair of insulating arc separation covers (32), the grid fin (31) comprises a cutting zone (311) and a pair of grid fin legs (312) symmetrically extending to the same side from the two ends of the cutting zone (311) in the length direction, and the pair of insulating arc separation covers (32) are respectively sleeved on a grid fin leg (312).

5. A single pole unit of a double-break switch according to claim 4, characterized in that: The grid fin (31) is arrayed in the up and down direction.

6. A single pole unit of a double-break switch according to claim 4, characterized in that: The insulating arc separation cover (32) comprises an insertion slot (321), an outer wall (322), an inner wall (323) and a spacing rib (324), the inner wall (323) and the outer wall (322) are arranged at a distance from each other, and after the insulating arc separation cover (32) is inserted with the pair of grid fin legs (312), the inner wall (323) is located on the inner side of the pair of grid fin legs (312), and the outer wall (322) is located on the outer side of the pair of grid fin legs (312), the spacing rib (324) is connected between the inner wall (323) and the outer wall (322), and the spacing rib (324) is multiple and arranged at a distance, and the insertion slot (321) is formed between adjacent spacing ribs (324).

7. A single pole unit of a double-break switch according to claim 6, characterized in that: The height of the inner wall (323) is greater than the height of the outer wall (322).

8. A single pole unit of a double-break switch according to claim 6, characterized in that: A gap (33) is formed between the pair of grid fin legs (312), and a clamping gap (313) is formed on the edge of the cutting zone (311) on the same side of the pair of grid fin legs (312) and close to the inner side of the pair of grid fin legs (312) in the gap (33), and the clamping gap (313) is used for inserting with the inner wall (323) of the insulating arc separation cover (32).

9. A single pole unit of a double-break switch according to claim 4, characterized in that: The gill blade (31) is formed with a pair of insertion edges (314) on the side opposite to the pair of gill blade legs (312) on the cutting area (311), the pair of insertion edges (314) are located at the two ends of the length direction of the cutting area (311), the inner wall of the shell (100) is provided with a slot corresponding to each gill blade (31) and matched with the insertion edge (314), and each gill blade (31) is positioned and installed in the shell (100) through the insertion of the insertion edge (314) and the slot.

10. A single pole unit of a double-break switch according to claim 4, characterized in that: An arc leading bending part is arranged on one gill blade (31) corresponding to the end of the movable contact arm (21), and the arc leading bending part is located between the pair of gill blade legs (312) when the bridge type movable contact (2) is in the open position.

Images