Contact system with protective cover and circuit breaker

Abstract

The utility model provides a contact system with a protective cover and a circuit breaker, the contact system comprises a rotatably arranged moving contact and a fixedly arranged static contact, the moving contact comprises at least one moving contact piece, the moving contact piece is provided with a moving contact, the static contact is provided with a static contact, and the contact system also comprises at least one protective cover structure, comprising at least one accommodating groove and a contact part, an elastic reset part and a contact hole are arranged in the accommodating groove, the protective cover structure is arranged on the moving contact, at least part of the moving contact piece is arranged in the accommodating groove, the moving contact can penetrate through the contact hole, and when the moving contact is in contact with the static contact, the contact part is limited by the static contact. The movable contact piece compresses the elastic reset part to enable the movable contact to extend out of the contact hole, when the movable contact is separated from the static contact, the elastic reset part resets to enable the movable contact to move in the direction of retracting into the containing groove relative to the protective cover structure, and when the movable contact is switched on and switched off, the movable contact can be insulated, and electric arc burning loss can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of electricity, and particularly relates to a contact system and a circuit breaker with a protective cover. Background Art

[0002] The existing circuit breaker includes a moving contact and a static contact. The moving contact usually includes multiple contact blades, and a moving contact for lapping with the static contact is arranged on each contact blade of the moving contact. Since there is no protective structure and air-blowing structure between the moving contacts, when the circuit breaker is powered on and switched on and off, the arc generated instantaneously during switching on and off discharges and ablates the moving contacts between the multiple moving contacts on the multiple contact blades, and the hot air generated instantaneously during the opening of the circuit breaker cannot be quickly discharged and cooled quickly. There are also technical solutions for arranging a protective structure and an air-blowing structure on the moving contact in the existing products, but the existing protective structure can protect the contact blades, but cannot protect the moving contacts. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a contact system and a circuit breaker with a protective cover for insulating the moving contacts during switching on and off.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] In a first aspect, the utility model provides a contact system with a protective cover, which includes a rotatably arranged moving contact and a fixedly arranged static contact. The moving contact includes at least one moving contact piece, a moving contact is arranged on the moving contact piece, and a static contact is arranged on the static contact.

[0006] It further includes at least one protective cover structure. The protective cover structure includes at least one accommodation groove and is provided with a contact part. An elastic reset part and a contact hole are arranged in the accommodation groove. The protective cover structure is arranged on the moving contact. At least part of the moving contact piece is placed in the accommodation groove, and the moving contact can pass through the contact hole. When the moving contact contacts the static contact, the contact part is limited by the static contact, and the moving contact piece compresses the elastic reset part to make the moving contact extend out of the contact hole. When the moving contact is separated from the static contact, the elastic reset part resets to make the moving contact move in the direction of retracting into the accommodation groove relative to the protective cover structure.

[0007] In a possible implementation manner, when the moving contact is separated from the static contact, the elastic reset part resets, and the moving contact completely retracts into the accommodation groove.

[0008] In one possible implementation, a first protective cover structure is provided on the static contact, and the first protective cover structure includes a first accommodating groove, a first elastic reset portion, a first contact hole and a first contact portion. The static contact piece is at least partially placed in the first accommodating groove, and the static contact can pass through the first contact hole. When the static contact contacts the moving contact, the first contact portion and the contact portion of the protective cover structure are abutted. The static contact piece compresses the first elastic reset portion to make the static contact extend from the first contact hole. When the static contact is separated from the moving contact, the first elastic reset portion resets to make the static contact move relative to the first protective cover structure in the direction of retracting into the first accommodating groove.

[0009] In one possible implementation, the protective cover structure includes two first side walls along the length direction of the protective cover structure and a bottom surface connecting the two first side walls, the two first side walls are arranged in parallel and spaced apart, the moving contact piece is at least partially located between the two first side walls, and the contact hole and the elastic reset portion are provided on the bottom surface.

[0010] In a possible implementation, a side edge of one end of the contact hole along the length direction is connected to an elastic reset portion, and the elastic reset portion is bent toward the center of the protective cover structure.

[0011] In a possible implementation, the protective cover structure is further provided with a second side wall along the width direction, and the second side wall is connected to the two first side walls and the bottom surface.

[0012] In a possible implementation, the contact portion is provided on two first side walls of the protective cover structure; or the contact portion is provided on a second side wall of the protective cover structure.

[0013] In a possible implementation, one end of the protective cover structure away from the movable contact is hinged to the movable contact.

[0014] In one possible implementation, the moving contact includes a plurality of moving contact pieces arranged side by side, a protrusion is provided on one side of the moving contact piece, and a recess is provided on the back side of the moving contact piece at a position relative to the protrusion. The plurality of moving contact pieces are stacked and installed by matching the protrusion and recess of the first mounting boss. The protective cover structure is provided with a mounting hole matching the first mounting boss and a protrusion matching the recess. The protrusion and the mounting hole are respectively arranged on both sides of the accommodating groove, and the protective cover structure rotates around the moving contact through the protrusion and the mounting hole.

[0015] In one possible implementation, the movable contact piece is interference-connected with the side wall of the accommodating groove and / or a rib is provided on the top side of the accommodating groove to prevent the movable contact piece from escaping from the accommodating groove.

[0016] In a possible implementation manner, the moving contact includes a plurality of moving contact pieces arranged side by side. The protective cover structure is provided with one or more receiving grooves, and one or more protective cover structures are mounted on the moving contact.

[0017] In a possible implementation manner, at least one of the plurality of moving contact pieces of the moving contact is an arcing contact piece. The length of the arcing contact piece is greater than the length of the moving contact piece, and the end is provided with a bent arcing angle. The arcing contact piece is disposed in the middle of the plurality of moving contact pieces.

[0018] In a possible implementation manner, the protective cover structure is made of an insulating gas-generating material.

[0019] In a possible implementation manner, the protective cover structure is integrally formed.

[0020] In a second aspect, the present application provides a circuit breaker including the contact system with a protective cover described above.

[0021] By providing a protective cover structure on the moving contact, the present utility model can effectively isolate the arc generated when the circuit breaker is closed or opened, prevent the arc from burning the moving contact on the moving contact, and extend the electrical life of the circuit breaker. The protective cover structure includes a receiving groove, and an elastic reset portion, a contact hole and a contact portion are provided in the receiving groove.

[0022] By providing an elastic reset portion on the protective cover structure, when the circuit breaker is closed, the contact portion of the protective cover structure can first contact the static contact. The receiving groove of the protective cover structure forms an insulating barrier between the moving contacts of the plurality of moving contact pieces. Then, the moving contact contacts the static contact, preventing the moving contacts on the plurality of moving contact pieces from discharging and burning each other due to the arc generated during closing. When the circuit breaker is opened, the moving contact on the moving contact piece first disconnects from the static contact on the static contact. At this time, the protective cover structure still contacts the static contact under the action of the elastic reset portion, and its receiving groove insulates the moving contact. Then, the elastic reset portion resets and drives the protective cover structure to move relative to the moving contact, and the moving contact can retract into the receiving groove.

[0023] Further, when the elastic reset portion resets, the moving contact can completely retract into the receiving groove, which can achieve a better insulating effect.

[0024] Further, a first protective cover structure is provided on the static contact, corresponding to the protective cover structure on the moving contact. When the circuit breaker is closed, the first protective cover structure and the protective cover structure on the moving contact and the static contact first abut against each other correspondingly, separating the moving contacts on each moving contact piece and the static contacts on the corresponding static contact pieces to form an insulating protection area. Then, the moving contact and the static contact contact and conduct. Providing protective cover structures on both the moving contact and the static contact has a better insulating effect, can improve the arc extinguishing ability, and extend the electrical life of the circuit breaker.

[0025] Further, a second side wall is provided in the width direction of the protective cover structure. The second side wall is connected to the two first side walls and the bottom surface to form a receiving groove, and a part of the moving contact piece is placed in the receiving groove.

[0026] Further, by setting the contact part as a rib, the protective cover structure contacts the static contact before the moving contact.

[0027] Further, through the interference connection between the moving contact and the side wall of the receiving groove and / or the cooperation between the moving contact piece and the rib on the top side of the receiving groove, the moving contact piece is fixedly installed and connected to a part of the protective cover structure, so that the receiving groove and the moving contact piece will not separate during the rotation of the moving contact.

[0028] Further, the protective cover structure is made of an insulating gas-generating material, which can cause the arc generated when the circuit breaker is closed or opened to burn and generate gas on the protective cover structure. The generated gas can cool the arc and drive the arc towards the arc extinguishing chamber, so that the arc is extinguished by the arc extinguishing chamber.

[0029] Further, the circuit breaker including the contact system with a protective cover provided by the present application can effectively reduce the damage of the arc to the circuit breaker and improve the service life of the circuit breaker. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the circuit breaker of the present utility model;

[0031] Figure 2 and Figure 3 is a schematic structural diagram of the moving contact of the present utility model;

[0032] Figure 4 is a schematic structural diagram of the protective cover structure of the present utility model;

[0033] Figure 5 is a schematic structural diagram of the moving contact piece of the present utility model;

[0034] In the figure: moving contact 1; static contact 2; moving contact point 11; static contact point 21; protective cover structure 3; receiving groove 31; elastic reset part 32; contact hole 33; contact part 34; first mounting hole 42; arc-leading contact piece 12; arc extinguishing chamber 6; arc extinguishing grid piece 61; rotating shaft 5; second mounting shaft 43; operating mechanism 7. Detailed Embodiments

[0035] The following embodiments given in conjunction with the drawings further illustrate the specific embodiments of the present utility model. The protection scope of the present utility model is not limited to the description of the following embodiments.

[0036] A circuit breaker is an electrical switching device connected to a power line for conducting or disconnecting a circuit. It can close, carry, and interrupt the current under normal circuit conditions and can also close, carry, and interrupt the current under abnormal circuit conditions within a specified time. A circuit breaker generally consists of a contact system, an arc extinguishing system, an operating mechanism, a housing, etc. Among them, the contact system includes a moving contact and a static contact. By connecting and disconnecting the moving contact and the static contact, the circuit is connected and disconnected. The arc extinguishing system is usually arranged corresponding to the contact system and is used to extinguish the arc generated when the moving contact and the static contact are connected or disconnected. The operating mechanism is connected to the moving contact and is used to drive the moving contact to swing and connect or disconnect from the static contact. A handle is provided on the operating mechanism for the staff to manually operate the circuit breaker to make it trip and close.

[0037] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the present application provides a contact system with a protective cover, which includes a rotatably arranged moving contact 1, a fixedly arranged static contact 2, and at least one protective cover structure 3. The moving contact 1 includes at least one moving contact piece, and a moving contact point 11 is arranged on the moving contact piece. A static contact point 21 is arranged on the static contact 2. When the circuit breaker is closed, the moving contact point 11 and the static contact point 21 are in contact, so that the moving contact 1 and the static contact 2 are connected and conducted, and the circuit breaker realizes the closing function. The moving contact point 11 and the static contact point 21 are usually made of silver or silver alloy.

[0038] The protective cover structure 3 is integrally formed, includes at least one receiving groove 31 and is provided with a contact portion 34. An elastic reset portion 32 and a contact point hole 33 are arranged in the receiving groove 31. The protective cover structure 3 is arranged on the moving contact 1. At least part of the moving contact piece is placed in the receiving groove 31, and the moving contact point 11 can pass through the contact point hole 33. When the moving contact point 11 contacts the static contact point 21, the contact portion 34 is limited by the static contact 2, and the moving contact piece compresses the elastic reset portion 32 to make the moving contact point 11 extend out of the contact point hole 33. When the moving contact point 11 is separated from the static contact point 21, the elastic reset portion 32 resets to make the moving contact point 11 move in the direction of retracting into the receiving groove 31 relative to the protective cover structure 3. Among them, the protective cover structure 3 provided in the present application can be applied to, but is not limited to, molded case circuit breakers and frame circuit breakers.

[0039] The utility model can effectively isolate the arc generated when the circuit breaker is closed or opened by arranging a protective cover structure 3 on the moving contact 1, prevent the arc from burning and eroding the moving contact 11 on the moving contact 1, and extend the electrical life of the circuit breaker. The protective cover structure 3 includes a receiving groove 31, and an elastic reset part 32, a contact hole 33 and a contact part 34 are arranged in the receiving groove 31. By arranging the elastic reset part 32 on the protective cover structure 3, when the circuit breaker is closed, the contact part 34 of the protective cover structure 3 can contact the static contact 2 first, and the receiving groove 31 of the protective cover structure 3 forms an insulating barrier between the moving contacts of multiple moving contact pieces. Then, the moving contact contacts the static contact, preventing the moving contacts on multiple moving contact pieces from discharging and eroding each other due to the arc generated during closing. When the circuit breaker is opened, the moving contact on the moving contact piece first disconnects from the static contact 2 on the static contact. At this time, the protective cover structure 3 still contacts the static contact 2 under the action of the elastic reset part 32, and its receiving groove 31 insulates the moving contact 11. After that, the elastic reset part 32 resets and drives the protective cover structure 3 to move relative to the moving contact 11, and the moving contact 11 can retract into the receiving groove 31.

[0040] Preferably, when the moving contact 11 separates from the static contact 21, the elastic reset part 32 resets, and the moving contact 11 can completely retract into the receiving groove 31. Of course, in a relatively poor embodiment, when the elastic reset part 32 resets, the moving contact 11 can also partially retract into the receiving groove 31. When the elastic reset part 32 resets and the moving contact 11 can completely retract into the receiving groove 31, a better insulation effect can be achieved.

[0041] In other embodiments, the static contact 2 can also have at least one static contact piece, and the static contact 21 is arranged on the static contact piece. At this time, the protective cover structure 3 can be provided on both the moving contact 1 and the static contact 2.

[0042] Preferably, a first protective cover structure is arranged on the static contact 2. The first protective cover structure has the same structural features as the protective cover structure 3. The first protective cover structure includes a first receiving groove, a first elastic reset part, a first contact hole and a first contact part. At least part of the static contact piece is placed in the first receiving groove, and the static contact 21 can pass through the first contact hole. When the static contact 21 contacts the moving contact 11, the first contact part abuts against the contact part 34 of the protective cover structure 3. The static contact piece compresses the first elastic reset part to make the static contact 21 extend out of the first contact hole. When the static contact 21 separates from the moving contact 11, the first elastic reset part resets to make the static contact 21 move in the direction of retracting into the first receiving groove relative to the first protective cover structure.

[0043] A first protective cover structure is provided on the static contact 2, corresponding to the protective cover structure 3 on the moving contact 1. When the circuit breaker is closed, the first protective cover structure on the moving contact 1 and the protective cover structure 3 on the static contact 2 first come into contact with each other correspondingly, separating the moving contacts on each moving contact piece from the static contacts on the corresponding static contact piece to form an insulated protection area. Then, the moving contacts and the static contacts contact and conduct. Setting the protective cover structure 3 on both the moving contact 1 and the static contact 2 has a better insulation effect, can improve the arc extinguishing ability, and extend the electrical life of the circuit breaker.

[0044] Preferably, as Figure 4 shown, the protective cover structure 3 includes two first side walls 311 along the length direction of the protective cover structure 3 and a bottom surface 314 connecting the two first side walls 311. The two first side walls 311 are arranged in parallel at intervals, and at least part of the moving contact piece is located between the two first side walls 311. The contact hole 33 and the elastic reset part 32 are provided on the bottom surface 314.

[0045] Preferably, one side edge of the contact hole 33 along the length direction is connected to the elastic reset part 32, and the elastic reset part 32 is bent towards the center of the protective cover structure 3. At this time, the elastic reset part 32 is placed between the contact hole 33 and the bottom surface 314. Of course, in other possible implementation manners, the elastic reset part 32 may not be provided on one side edge of the contact hole 33 along the length direction, but may be protrudingly provided on the inner side of the bottom surface 314.

[0046] Furthermore, as Figure 4 shown, the protective cover structure 3 further has a second side wall 312 along the width direction. The second side wall 312 is connected to the two first side walls 311 and the bottom surface 314 to form a receiving groove 31, and part of the moving contact piece can be placed in the receiving groove 31. A protruding extension rib is provided on the outer side of the second side wall 312. The extension rib can strengthen the strength of the protective cover structure 3 and increase the gas-producing material.

[0047] Furthermore, the contact part 34 can be a convex rib, provided on the two first side walls 311 of the protective cover structure 3, and the protective cover structure 3 contacts the static contact through the convex rib; or the contact part 34 is provided on the second side wall 312 of the protective cover structure 3, or the protective cover structure 3 does not separately provide a contact part 34 with a convex rib structure, and the first side wall 311 and / or the second side wall 312 of the protective cover structure 3 itself can be used as the contact part 34. When the circuit breaker is closed, the first side wall 311 and / or the second side wall 312 contacts the static contact, which can also achieve the same technical effect and belongs to the protection scope of this application. By providing convex ribs on the contact part 34, the protective cover structure 3 contacts the static contact 2 prior to the moving contact.

[0048] Preferably, as Figure 4As shown, one end of the protective cover structure 3 away from the moving contact 11 is hinged to the moving contact 1. During the opening process of the moving contact 1, one end of the bottom surface 314 of the protective cover structure 3 abuts against the bottom surface of the moving contact 1, locking the rotation angle of the protective cover structure 3. In other possible implementation manners, the moving contact piece is in interference connection with the side wall of the receiving groove 31 and / or the top side 313 of the receiving groove 31 is provided with a rib for restricting the moving contact piece from disengaging from the receiving groove 31. Through the interference connection between the moving contact and the side wall of the receiving groove 31 and / or the cooperation between the moving contact piece and the rib on the top side 313 of the receiving groove 31, the moving contact piece is fixedly installed and connected to a part of the protective cover structure 3, so that the receiving groove 31 and the moving contact piece will not separate during the rotation of the moving contact 1, locking the rotation angle of the protective cover structure 3.

[0049] Specifically, as Figure 4 and Figure 5 shown, a first mounting boss 42 is further provided on the moving contact 1. The first mounting boss 42 is provided on each moving contact piece. The specific structure of the first mounting boss 42 is that a protrusion 421 is provided on one surface of the moving contact piece, and a depression 422 is provided at a position on the back surface of the moving contact piece corresponding to the protrusion 421. A plurality of moving contact pieces are stacked and installed through the cooperation of the protrusion 421 and the depression 422 of the first mounting boss 42. The first mounting boss 42 can be manufactured by stamping, with a simple structure and low cost. An installation hole 424 for cooperating with the first mounting boss 42 and a protrusion 423 for cooperating with the depression 422 are provided on the protective cover structure 3. The protrusion 423 and the installation hole 424 are respectively arranged on both sides of the receiving groove 31. The protective cover structure 3 can rotate around the moving contact 1 through the protrusion 423 and the installation hole 424. Among them, when the protective cover structure 3 includes a plurality of receiving grooves 31, an installation hole 424 for cooperating with the protrusion 421 of the moving contact piece is provided on the first side wall 311 between the receiving grooves 31, and the protrusion 421 can rotate in the installation hole 424. Of course, as other embodiments, through holes can also be provided on the moving contact pieces, and the moving contact pieces and the protective cover structure 3 are connected by a hinge shaft passing through them.

[0050] Preferably, the moving contact 1 includes a plurality of moving contact pieces arranged side by side. Each protective cover structure 3 is provided with one or more receiving grooves 31, and one or more protective cover structures 3 are installed on the moving contact 1.

[0051] Further, the moving contact 1 includes a plurality of moving contact pieces arranged side by side. A protective cover structure 3 is provided on the moving contact 1. The protective cover structure 3 includes a plurality of receiving grooves 31 that cooperate with the plurality of moving contact pieces, and the plurality of moving contact pieces are placed in the plurality of receiving grooves 31 of the protective cover structure 3; alternatively, the moving contact 1 includes a plurality of moving contact pieces arranged side by side, and a plurality of protective cover structures 3 are provided on the moving contact 1. Each protective cover structure 3 includes one or more receiving grooves 31.

[0052] Further, when the moving contact 1 includes a plurality of moving contact pieces, at least one of the plurality of moving contact pieces of the moving contact 1 is an arc - starting contact piece 12. The length of the arc - starting contact piece 12 is greater than the length of the moving contact piece, and the end is provided with a bent arc - starting angle; the arc - starting contact piece 12 is arranged in the middle of the plurality of moving contact pieces, which is beneficial to the concentration of the arc. In other embodiments, the arc - starting contact piece 12 may not be arranged in the middle of the plurality of moving contact pieces. For example, it may also be arranged on one side of the plurality of moving contact pieces, or a plurality of arc - starting contact pieces 12 may be provided.

[0053] Specifically, in the embodiment as Figure 2 shown, the moving contact 1 is provided with five moving contact pieces, two protective cover structures 3. The middle moving contact piece is the arc - starting contact piece 12, and the protective cover structure 3 is not provided. Each protective cover structure 3 is provided with two receiving grooves 31, and the two protective cover structures 3 are sleeved on the other four moving contact pieces. Of course, the arc - starting contact piece 12 may also be sleeved with a protective cover structure 3, the moving contact 1 may not be provided with an arc - starting contact piece 12, and the protective cover structure 3 may be provided with one or more receiving grooves 31.

[0054] Preferably, the protective cover structure 3 is made of an insulating gas - generating material. For example, the insulating gas - generating material may be nylon, melamine, PA46, etc. Since the protective cover structure 3 is arranged at the contact part between the moving contact 1 and the static contact 2, close to the arc root of the arc, the protective cover structure 3 is easily ablated by the arc to generate gas.

[0055] Preferably, the moving contact point 11 is an arc surface, and the arc surface facilitates the connection between the moving contact 1 and the static contact 2 in a rotational manner, and the contact and conduction effect is better.

[0056] Preferably, the present application further includes a circuit breaker, which includes the contact system with a protective cover described above, and further includes an arc extinguishing chamber 6 corresponding to the contact system. The arc extinguishing chamber 6 includes a plurality of arc extinguishing grids 61 arranged at intervals. By arranging the arc extinguishing chamber in the circuit breaker, the arc generated when the circuit breaker closes or opens can be effectively eliminated. The arc extinguishing grids 61 generally correspond to the movement track of the moving contact 1, dividing the arc extinguishing area in the arc extinguishing system into multiple independent arc running and arc extinguishing channels. The arc is divided into several parts by the plurality of arc extinguishing grids 61 to compress and cool the arc, so that the arc energy during breaking is reduced, and the reliability of breaking is improved. At the same time, when the circuit breaker closes or opens and generates an arc, a large amount of gas is generated under the burning of the arc by the protective cover structure 3 to cool the arc and drive the arc towards the arc extinguishing chamber 6, so that the arc is extinguished by the arc extinguishing chamber 6. The arc extinguishing grids 61 in the arc extinguishing chamber 6 of the circuit breaker of the present application are arranged horizontally. In other embodiments, the arc extinguishing grids 61 may not be horizontally arranged, and may be inclined or vertically arranged, as long as they generally correspond to the movement track of the moving contact 1 and are convenient for extinguishing the arc, all of which belong to the protection scope of the present application. The circuit breaker including the contact system with a protective cover provided by the present application can effectively reduce the damage of the arc to the circuit breaker and improve the service life of the circuit breaker.

[0057] The circuit breaker further includes a rotating shaft 5. The moving contact 1 further includes a second mounting shaft 43. A second mounting hole for cooperating with the second mounting shaft 43 is provided on the rotating shaft 5. The cooperation between the second mounting shaft 43 and the second mounting hole enables the moving contact 1 to be hinged to the rotating shaft 5. As the rotating shaft 5 rotates, the moving contact 1 is driven to rotate, so that the moving contact 1 is connected or disconnected from the static contact 2, realizing the closing or opening of the circuit breaker. A contact spring is further provided between the moving contact 1 and the rotating shaft 5. The contact spring can fix the moving contact 1. During the closing process of the circuit breaker, after the moving contact 1 rotates and contacts the static contact 2, the contact spring can make the moving contact 1 have a buffering effect to prevent damage to the moving contact 1 and / or the static contact 2 during the closing process and affect the electrical life of the circuit breaker. The circuit breaker in the present application further includes an operating mechanism 7. The operating mechanism 7 is connected to the rotating shaft 5 and is used to manually operate the circuit breaker to realize opening and closing. The operating mechanism 7 can have various realizable ways, and will not be listed one by one here.

[0058] In order to more clearly understand the movement mode of the protective cover structure 3 of the contact system of the present application during the closing and opening processes of the circuit breaker, the following takes the protective cover structure 3 being arranged on the moving contact 1 as an example for description.

[0059] When the circuit breaker is closed, the moving contact 1 rotates clockwise or counterclockwise, driving the protective cover structure 3 thereon to rotate. The contact portion 34 of the protective cover structure 3 first contacts the static contact 2, and then the moving contact 1 continues to rotate. The moving contact piece within the protective cover structure 3 presses the elastic reset portion 32 to deform it, enabling the moving contact point 11 to contact the static contact point 21, thus achieving the closing operation of the circuit breaker; when the circuit breaker is opened, the moving contact 1 rotates counterclockwise or clockwise, and the moving contact point 11 and the static contact point 21 are separated. At this time, the protective cover structure 3 still contacts the static contact under the action of the elastic reset portion 32. The moving contact 1 continues to rotate, and the rotation of the moving contact piece releases the extrusion of the elastic reset portion 32. The elastic reset portion 32 resets, and the moving contact point 11 of the moving contact 1 retracts into the protective cover structure 3 as a whole. The moving contact 1 drives the protective cover structure 3 to rotate counterclockwise or clockwise together. When the protective cover structure 3 is disposed on the static contact 2 or simultaneously disposed on both the static contact 2 and the moving contact 1, the operation mode is the same as when the protective cover structure 3 is only disposed on the moving contact 1, and will not be elaborated here.

[0060] The protective cover structure 3 can insulate the moving contact point 11 on the moving contact 1 and / or the static contact point 21 on the static contact 2 when the moving contact 1 is connected to or disconnected from the static contact 2, so as to prevent the silver points on the moving contact 1 from being punctured by each other and burned when the moving contact 1 is connected to or disconnected from the static contact 2. At the same time, since hot air is generated when the circuit breaker is opened and needs to be quickly discharged and cooled, the protective cover structure 3 is preferably made of an insulating gas-generating material, which will generate a large amount of gas when the circuit breaker is opened, and will expel the hot air generated when the circuit breaker is opened.

[0061] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is habitually placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0062] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A contact system with a protective cover, comprising a rotatably arranged moving contact (1) and a fixedly arranged stationary contact (2). The moving contact (1) includes at least one moving contact piece, and a moving contact point (11) is arranged on the moving contact piece. A stationary contact point (21) is arranged on the stationary contact (2), and it is characterized in that, it further includes at least one protective cover structure (3), which includes at least one receiving groove (31) and is provided with a contact portion (34). An elastic reset portion (32) and a contact point hole (33) are arranged in the receiving groove (31). The protective cover structure (3) is arranged on the moving contact (1), at least part of the moving contact piece is placed in the receiving groove (31), and the moving contact point (11) can pass through the contact point hole (33). When the moving contact point (11) contacts the stationary contact point (21), the contact portion (34) is limited by the stationary contact (2), and the moving contact piece compresses the elastic reset portion (32) to make the moving contact point (11) extend out of the contact point hole (33). When the moving contact point (11) separates from the stationary contact point (21), the elastic reset portion (32) resets to make the moving contact point (11) move in the direction of retracting into the receiving groove (31) relative to the protective cover structure (3).

2. The contact system with a protective cover according to claim 1, characterized in that, When the moving contact point (11) separates from the stationary contact point (21), the elastic reset portion (32) resets, and the moving contact point (11) completely retracts into the receiving groove (31).

3. The contact system with a protective cover according to claim 1, characterized in that, A first protective cover structure is arranged on the stationary contact (2). The first protective cover structure includes a first receiving groove, a first elastic reset portion, a first contact point hole, and a first contact portion. At least part of the stationary contact piece is placed in the first receiving groove, and the stationary contact point (21) can pass through the first contact point hole. When the stationary contact point (21) contacts the moving contact point (11), the first contact portion abuts against the contact portion (34) of the protective cover structure (3), and the stationary contact piece compresses the first elastic reset portion to make the stationary contact point (21) extend out of the first contact point hole. When the stationary contact point (21) separates from the moving contact point (11), the first elastic reset portion resets to make the stationary contact point (21) move in the direction of retracting into the first receiving groove relative to the first protective cover structure.

4. The contact system with a protective cover according to claim 1, characterized in that, The protective cover structure (3) includes two first side walls (311) along the length direction of the protective cover structure (3) and a bottom surface (314) connecting the two first side walls (311). The two first side walls (311) are arranged in parallel at intervals, and at least part of the moving contact piece is located between the two first side walls (311). The contact point hole (33) and the elastic reset portion (32) are arranged on the bottom surface (314).

5. The contact system with a protective cover according to claim 4, characterized in that, One side edge of one end of the contact point hole (33) along the length direction is connected to the elastic reset portion (32), and the elastic reset portion (32) bends towards the center direction of the protective cover structure (3).

6. The contact system with a protective cover according to claim 4, characterized in that, The protective cover structure (3) is further provided with a second side wall (312) along the width direction, and the second side wall (312) is connected to the two first side walls (311) and the bottom surface (314).

7. The contact system with a protective cover according to claim 6, characterized in that, The contact part (34) is arranged on two first side walls (311) of the protective cover structure (3); or the contact part (34) is arranged on the second side wall (312) of the protective cover structure (3).

8. The contact system with a protective cover according to claim 1, characterized in that, One end of the protective cover structure (3) away from the moving contact (11) is hinged to the moving contact head (1).

9. The contact system with a protective cover according to claim 8, characterized in that, The moving contact head (1) includes a plurality of moving contact pieces arranged side by side. A protrusion (421) is provided on one side of the moving contact piece, and a recess (422) is arranged at a position on the back surface of the moving contact piece relative to the protrusion (421). The plurality of moving contact pieces are stacked and installed by the cooperation of the protrusion (421) and the recess (422) of the first mounting boss (42). An installation hole (424) for cooperating with the first mounting boss (42) and a protrusion part (423) for cooperating with the recess (422) are provided on the protective cover structure (3). The protrusion part (423) and the installation hole (424) are respectively arranged on two sides of the receiving groove (31). The protective cover structure (3) rotates around the moving contact head (1) through the protrusion part (423) and the installation hole (424).

10. The contact system with a protective cover according to claim 8, characterized in that, The moving contact piece is in interference connection with the side wall of the receiving groove (31) and / or a rib for limiting the moving contact piece to escape from the receiving groove (31) is provided on the top side (313) of the receiving groove (31).

11. The contact system with a protective cover according to claim 1, characterized in that, The moving contact head (1) includes a plurality of moving contact pieces arranged side by side. The protective cover structure (3) is provided with one or more receiving grooves (31), and one or more protective cover structures (3) are installed on the moving contact head (1).

12. The contact system with a protective cover according to claim 11, characterized in that, At least one of the plurality of moving contact pieces of the moving contact head (1) is an arcing contact piece (12). The length of the arcing contact piece (12) is greater than the length of the moving contact piece, and a bent arcing angle is provided at the end; the arcing contact piece (12) is arranged in the middle of the plurality of moving contact pieces.

13. The contact system with a protective cover according to claim 1, characterized in that, The protective cover structure (3) is made of an insulating gas-generating material.

14. The contact system with a protective cover according to any one of claims 1-13, characterized in that, The protective cover structure (3) is integrally formed.

15. A circuit breaker, characterized in that, It includes the contact system with a protective cover according to any one of claims 1-14.

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