WO2023142184A1 - Rotary switch moving contact assembly for physically interrupting electric arc - Google Patents

Abstract

The present invention belongs to the technical field of rotary switches, and particularly relates to a rotary switch moving contact assembly for physically interrupting an electric arc. The assembly comprises a moving contact rotary frame, and a moving contact provided on the moving contact rotary frame and in linkage fit with the moving contact rotary frame. A physical interruption structure used for interrupting an electric arc is provided on the moving contact rotary frame, the physical interruption structure comprising at least one group of insulation clamp heads. One group of insulation clamp heads consists of two oppositely-arranged insulation clamp heads which are at least partially insulated, and the two oppositely-arranged insulation clamp heads have a first state in which the two insulation clamp heads are separated to form a gap allowing a static contact to rotate therethrough, and a second state in which the two insulation clamp heads are contacted for interrupting an electric arc. The present invention is innovative in that a mode of physically interrupting an electric arc between the moving contact and the static contact by means of the insulation clamp heads is provided for a rotary switch; in comparison with an existing arc extinguishing mode, the arc extinguishing effect is remarkably improved.

Description

A rotary switch moving contact assembly that physically cuts off arcs technical field

The invention belongs to the technical field of rotary switches, and in particular relates to a rotary switch moving contact assembly for physically blocking electric arcs.

Background technique

The rotary isolating switch in the prior art is usually formed by stacking several switch units. Each switch unit includes a housing, a moving contact, a static contact and a rotating frame for the moving contact. The moving contact is installed on the moving contact. The rotating frame, the moving contact rotating frame is rotated and set on the shell, the static contact is fixed on the shell and is located on the rotation track of the moving contact, when the moving contact rotating frame rotates, the moving contact and the static contact are connected or disconnected , constitute the closing and opening of the circuit.

Arc is a gas discharge phenomenon, the instantaneous spark generated by the current passing through some insulating medium (such as air). When the switch contacts are separated, the distance between the contacts is very small, and the electric field intensity E is very high, so an arc will be generated when the moving contacts are separated from the static contacts. The arc will not only have a great destructive effect on the contacts, but also prolong the time for disconnecting the circuit, and the high temperature formed by the arc may burn the contacts and insulation, and even cause phase-to-phase short circuit and electrical explosion in severe cases, resulting in cause a fire and endanger the safety of personnel and equipment. Therefore, setting the arc extinguishing mechanism in the isolating switch is an important setting to ensure the safety of use.

In the field of switch technology, the current conventional arc extinguishing methods include: elongated arc, metal grid arc extinguishing chamber, gas blowing arc extinguishing device, folding vacuum arc extinguishing device, etc. At present, the conventional arc extinguishing method in the rotary isolating switch is to set up an arc extinguishing chamber, but the arc extinguishing effect is not good. The applicant has previously applied for a number of arc extinguishing structures for rotary isolating switches, including the arrangement of permanent magnets disclosed in patent 201820047807.4, and the arc is extinguished by using the magnetic field formed by the permanent magnets to pull the arc. The limitation of the setting position leads to limited arc extinguishing effect; in the patent CN202020221756.X, the arc is introduced into the arc extinguishing chamber by setting the arc extinguishing chamber and setting the permanent magnet. complex structure.

technical problem

The object of the present invention is to provide a rotary switch moving contact assembly that physically cuts off the arc in order to overcome the shortcomings and deficiencies of the prior art.

technical solution

The technical scheme adopted by the present invention is as follows: a rotary switch moving contact assembly for physically cutting off the arc, including a moving contact turret, a moving contact arranged on the moving contact turret and cooperating with the moving contact turret , the movable contact turret is provided with a moving area for the static contact to rotate between the closed and open states relative to the movable contact, and the movable contact turret is provided with a physical partition for breaking the arc structure, the physical partition structure includes at least one set of insulating clamps, one set of insulating clamps is composed of two oppositely disposed at least partially insulated insulating clamps; and at least one set of insulating clamps is located in the moving area, two The opposite insulating clamps have a first state of being separated to form a gap for the static contact to pass through, and a second state of being combined to cut off the breaking arc.

At least part of the physical partition structure has elasticity so that the two opposite insulating chucks are separated when the static contact turns over and reset to the combined state under the action of its own elasticity. An active guide surface that interacts to separate two oppositely disposed insulating clips.

The physical partition structure includes a spring body, the spring body is provided with a first elastic action part, and the insulating clip is fixed on the first elastic action part.

The insulating clip is obtained by integral injection molding of insulating material directly outside the first elastic action part.

The physical partition structure includes two shrapnel bodies respectively located on both sides of the moving contact and cooperating with the moving contact turret. The two insulating chucks, which are also a set of insulating chucks, are respectively arranged on the two shrapnel bodies. superior.

The movable contact includes at least one pair of movable contact pieces, and a matching gap is formed between the paired movable contact pieces for the insertion of the static contact; The main body of the shrapnel is respectively provided with a second elastic action part for forming an elastic force on the moving contact pieces, and the set of paired moving contact pieces has a closed state stretched by the static contacts and an elastic force after being separated from the static contacts. Reset the disconnected state.

The insulating chucks are arranged adjacent to the moving contacts, so that when a group of paired moving contacts is in a closed state stretched by the static contacts, the two oppositely arranged insulating chucks are phase-separated so that the two The first state in which a gap for the static contact to turn is formed between them.

The moving contact is composed of two contact pieces stacked up and down and connected by riveting, the contact piece has at least one moving contact piece, and the two contact pieces are stacked up and down to form at least one pair of moving contact pieces, A matching gap for inserting the static contacts is formed between the paired moving contact pieces.

The two contact pieces constituting the moving contact are connected by a connecting piece, and one or two contact pieces are provided with a riveting piece on the outer periphery for riveting the other contact piece; the two contact pieces, the connecting piece, the riveting piece Formed in one piece, the moving contact is composed of two contact pieces bent at the connecting piece, then superimposed up and down and connected by riveting.

The insulating clip is arranged adjacent to the movable contact piece.

Beneficial effect

The beneficial effects of the present invention are as follows: when the movable contact and the static contact are separated, the arc generated between the movable contact and the static contact forms an arc along with the rotation of the movable contact. The method of physically cutting off the arc between the moving contact and the static contact by insulating the chuck, the principle of realizing arc extinguishing is completely different from the principle of the existing conventional arc extinguishing method, but in the actual test process, it is found that using The rotary isolating switch with a physical partition structure of the present invention has significantly improved arc extinguishing effects compared with multiple patents previously applied by the applicant.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, obtaining other drawings based on these drawings still belongs to the scope of the present invention without any creative effort.

Fig. 1 is a schematic structural diagram of a moving contact assembly in an embodiment of the present invention;

Fig. 2 is an exploded view of a moving contact assembly in an embodiment of the present invention;

Fig. 3 is a schematic structural view of the main body of the shrapnel in an embodiment of the present invention;

Fig. 4 is a schematic structural view of an insulating chuck in an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a moving contact in an embodiment of the present invention;

Fig. 6 is a schematic diagram of the expanded structure of the moving contact in an embodiment of the present invention;

Fig. 7 is a schematic diagram of the position and structure of the moving contact assembly and the static contact in the breaking state according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of the position structure of the moving contact assembly and the static contact in the close closed state according to an embodiment of the present invention;

Fig. 9 is a schematic diagram of the position and structure of the moving contact assembly and the static contact in a closed state according to an embodiment of the present invention, in which the structure of the moving contact has been hidden.

In the figure, 1, moving contact turret; 101, moving area; 102, linkage column; 2, moving contact; 201, moving contact piece; 202, connecting piece; 203, riveting piece; 3, insulating chuck; 301 , the socket; 302, the action guide surface; 4, the main body of the shrapnel; 401, the first elastic action part; 402, the second elastic action part; 5, the static contact; 6, the shell cover.

BEST MODE FOR CARRYING OUT THE INVENTION

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

The terms of direction and position mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom" ", "side", etc., are only referring to the direction or position of the drawings. Therefore, the terms used in direction and position are used to explain and understand the present invention, but not to limit the protection scope of the present invention.

The invention provides a rotary switch moving contact assembly that physically cuts off the arc, including a moving contact turret 1, a moving contact 2 arranged on the moving contact turret 1 and cooperating with the moving contact turret 1, and a housing The cover 6 and the movable contact turret 1 are provided with a square linkage column 102 , and the movable contact 2 is sleeved outside the linkage column 102 to rotate with the rotation of the movable contact turret 1 . The movable contact turret 1 is provided with a moving area 101 for the static contact 5 to rotate between the closed and open states relative to the movable contact. In the rotary isolating switch, the movable contact assembly rotates, and the static contact The head does not move, and the position of the static contact relative to the moving contact changes during the rotation of the moving contact assembly.

The moving contact turret 1 is provided with a physical partition structure for breaking the arc, and the physical partition structure includes at least one set of insulating clamps 3, and a set of insulating clamps 3 are two oppositely arranged at least partially insulated and at least one set of insulating chucks 3 is located in the moving area 101, and the two oppositely disposed insulating chucks 3 have phase separation so that a gap for the static contact 5 is formed between the two. A state and a second state that coincides to interrupt the breaking arc.

Further, at least part of the physical partition structure has elasticity so that the two oppositely disposed insulating clips 3 are separated when the static contact 5 turns over and reset to the combined state under the action of its own elasticity. The insulating clips 3 are provided with There is an active guide surface 302 for interacting with the static contact 5 to separate the two opposite insulating clips 3 . When the static contact 5 rotates past, the static contact 5 overcomes the elastic effect of the physical partition structure and squeezes apart to separate the two insulating chucks 3. After the static contact 5 rotates, it returns to the matching state under its own elasticity and directly cuts off The arc between the static contact 5 and the moving contact. In this embodiment, the acting guide surface 302 is a smooth convex surface as shown in the figure, and may also be a guide slope or other structures that can interact with the static contacts to separate the two oppositely disposed insulating chucks 3 .

Further, the physical partition structure includes a spring body 4 , as shown in FIG. 3 , the spring body 4 is provided with a first elastic action part 401 , and the insulating clip 3 is fixed on the first elastic action part 401 .

As shown in FIG. 4 , the insulating clip 3 is obtained by integral injection molding of an insulating material directly outside the first elastic action portion 401 . Wherein, preferably, the shrapnel main body 4 is a metal shrapnel, which has a long service life.

The physical partition structure includes two shrapnel bodies 4 located on both sides of the movable contact 2 and cooperating with the movable contact turret 1, and the two insulating chucks 3 that are the same group of insulating chucks 3 are respectively set On the two shrapnel main bodies 4. In this embodiment, the movable contact turret 1 has a central linkage shaft, and a shrapnel main body 4 , a moving contact 2 , and another shrapnel main body 4 are sequentially sleeved outside the central linkage shaft, which is convenient for assembly.

As shown in FIG. 5 , the moving contact 2 includes at least one pair of moving contact pieces 201 , and a matching gap for insertion of the static contact 5 is formed between the pair of moving contact pieces 201 . In some embodiments of the present invention, the two spring main bodies 4 respectively located on both sides of the movable contact 2 are respectively provided with a second elastic action part 402 for forming elastic force on the movable contact 201 , the one composition The set movable contact piece 201 has a closed state stretched by the static contact 5 and an open state elastically reset after being separated from the static contact 5, that is, the second elastic action part 402 of the elastic piece main body 4 acts on the movable contact piece 201. A pressing pressure is formed to keep the moving contact piece 201 and the static contact 5 in engagement when closing. In addition, the movable contact 2 itself may have some elasticity or may not have elasticity, completely relying on the function of the elastic piece main body 4 .

Further, as shown in FIG. 3 , the first elastic action part 401 is arranged close to the second elastic action part 402 so that the insulating clip 3 is adjacent to the movable contact piece 201 , so that when a pair of movable contact pieces 201 In the closed state stretched apart by the static contact 5 , the two opposite insulating clips 3 are in a first state of being separated so that a gap for the static contact 5 to pass through is formed between them. That is to say, when the static contact 5 and the moving contact are unclosed, the two oppositely arranged insulating chucks 3 are in a phase-separated state. Turn out the gap, so that there will be no obvious resistance to the rotation of the moving contact assembly during the breaking process.

As shown in Figure 5, the movable contact 2 is composed of two contact pieces stacked up and down and connected by riveting. The contact piece has at least one movable contact piece 201, and the two contact pieces are stacked up and down to form at least one A pair of moving contact pieces 201 are formed, and a matching gap for insertion of the static contact 5 is formed between the pair of moving contact pieces 201 .

As shown in Figure 6, the two contact pieces that constitute the movable contact 2 are connected through a connecting piece 202, and a riveting piece 203 for riveting the other contact piece is provided on the outer periphery of one contact piece or two contact pieces; The contact 2 is composed of two contact pieces bent at the connecting piece 202 and then stacked up and down and connected by riveting.

In this embodiment, the insulating clip 3 is arranged adjacent to the movable contact piece 201 . It is also possible to keep a certain distance between the insulating clamp 3 and the moving contact piece 201 . In actual tests, the shorter the distance between the insulating clamp 3 and the moving contact piece 201 , the better the arc extinguishing effect.

The action process of this embodiment with the static contact 5 is as follows: As shown in Figure 7, in the disconnected state, there is a certain distance between the movable contact 2 and the static contact 5, and the insulating chuck 3 is located on the movable contact 2. Between the static contact 5, the insulating clip 3 fits under the shrapnel main body 4, and the moving contact assembly is rotated so that the moving contact 2 moves in a direction close to the static contact 5 until the static contact 5 touches the insulating clip After the head 3, the static contact 5 interacts with the action guide surface 302, so that the two opposite insulating chucks 3 are separated, as shown in Figure 8, continue to move to the position in Figure 9, and enter the cooperation of the moving contact piece 201 In the gap, it is connected with the moving contact to form a closed state.

From closing to breaking, the moving contact assembly moves in the opposite direction. After moving away from the insulating chuck 3, the insulating chuck 3 resets to the matching position shown in FIG. The arc between the head and the static contact achieves the purpose of arc extinguishing.

The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (10)

1. A rotary switch moving contact assembly for physically cutting off electric arcs, comprising a moving contact turret (1), a moving contact arranged on the moving contact turret (1) and cooperating with the moving contact turret (1) (2), the movable contact turret (1) is provided with a moving area (101) for the static contact (5) to rotate between the closed and open states relative to the movable contact, which is characterized in that: The moving contact turret (1) is provided with a physical partition structure for breaking the arc, and the physical partition structure includes at least one set of insulating chucks (3), and a set of insulating chucks (3) are two oppositely arranged At least part of the insulation clamps (3) is composed of insulation; and at least one set of insulation clamps (3) is located in the moving area (101), and the two opposite insulation clamps (3) have phase separation so that the two The first state in which a gap is formed for the static contact (5) to pass through and the second state in which the arc can be cut off by combining.
2. According to claim 1, the rotary switch moving contact assembly for physically cutting off the electric arc is characterized in that: at least part of the physical blocking structure has elasticity so that two opposite insulating chucks (3) are placed on the fixed contact (5) When turning over, the phases are separated and reset to the combined state under the action of self-elasticity. The insulating chuck (3) is provided with a function for interacting with the static contact (5) to separate the two opposite insulating chucks (3) The action guide surface (302).
3. The rotary switch moving contact assembly for physically cutting off the arc according to claim 2, characterized in that: the physical blocking structure includes a shrapnel body (4), and the shrapnel body (4) is provided with a first elastic action part (401 ), the insulating clip (3) is fixed on the first elastic action part (401).
4. The rotary switch moving contact assembly for physically blocking electric arc according to claim 3, characterized in that: said insulating clip (3) is obtained by integral injection molding of insulating material directly outside the first elastic action part (401).
5. According to claim 3, the rotary switch moving contact assembly for physically cutting off the electric arc is characterized in that: the physical blocking structure includes two movable contact turrets ( 1) The shrapnel main body (4) that cooperates in linkage, and the two insulating chucks (3) that are a group of insulating chucks (3) are respectively arranged on the two shrapnel main bodies (4).
6. The moving contact assembly of the rotary switch for physically cutting off the arc according to claim 5, characterized in that: the moving contact (2) includes at least one pair of moving contact pieces (201), and the pair of moving contact pieces (201) A matching gap is formed between the movable contact pieces (201) for the insertion of the static contact (5); The moving contact piece (201) forms a second elastic action part (402) of elastic force, and the set of paired moving contact piece (201) has a closed state stretched by the static contact (5) and is in contact with the static contact ( 5) Disconnected state of elastic reset after separation.
7. According to claim 6, the moving contact assembly of the rotary switch that physically cuts off the electric arc is characterized in that: the insulating chuck (3) is arranged adjacent to the moving contact piece (201), so that it can be regarded as a pair of moving contacts arranged in pairs. When the piece (201) is in the closed state stretched by the static contact (5), the two opposite insulating chucks (3) are phase-separated to form a gap between the two for the static contact (5) to turn over. The first state of the void.
8. The rotary switch moving contact assembly for physically cutting off the electric arc according to claim 6, characterized in that: the moving contact (2) is composed of two contact pieces stacked up and down and connected by riveting, and the contact pieces have at least One movable contact piece (201), and the two contact pieces are superimposed up and down to form at least one pair of movable contact pieces (201), and the paired movable contact pieces (201) form a static The mating gap where the contact (5) is inserted.
9. The rotary switch moving contact assembly for physically cutting off the arc according to claim 8, characterized in that: the two contact pieces constituting the moving contact (2) are connected through a connecting piece (202), one of the contact pieces or two A riveting piece (203) is provided on the outer periphery of one contact piece for riveting another contact piece; the two contact pieces, the connecting piece (202) and the riveting piece (203) are integrally formed, and the moving contact (2) is two The contact pieces are folded at the connecting piece (202) and then stacked up and down and connected by riveting.
10. The moving contact assembly of a rotary switch for physically cutting off an arc according to any one of claims 1-6, 8-9, characterized in that: the insulating clip (3) is arranged adjacent to the moving contact piece (201).