Circuit breaker

Abstract

A circuit breaker provided by the present invention comprises a housing and internal elements, the internal elements at least comprise an upper arc extinguish chamber, a lower arc extinguish chamber, a double-breakpoint contact system, a first wiring terminal, a second wiring terminal, an overload release, a mechanism and a rotating shaft, and the double-breakpoint contact system comprises a single-breakpoint moving contact, a double-breakpoint moving contact and a static contact. The mechanism drives at least one rotating shaft, the double-breakpoint contact system is arranged between the upper arc extinguish chamber and the lower arc extinguish chamber, and the single-breakpoint moving contact and the double-breakpoint moving contact are respectively driven by two rotating shafts. When the circuit breaker is subjected to breaking and manual operation opening, the mechanism drives the two sets of rotating shafts to move together so that the two breakpoints can be kept disconnected at the same time, the opening distance is large, the isolation performance is good, and high-short-circuit current under high voltage can be broken.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-voltage electrical appliances, and particularly relates to a circuit breaker. Background Art

[0002] When the circuit breaker interrupts the short-circuit current, an electrodynamic force will be generated between the contacts. When the electrodynamic force is greater than the contact pressure, the contacts will be repelled under the action of the electrodynamic force, and an arc will be generated between the contacts. As the distance of repulsion increases, the arc resistance increases. At the same time, under the action of the arc extinguishing chamber, the arc is deionized and extinguished; the faster the contact repulsion speed, the greater the repulsion distance, and the more the number of breaking points, the higher the breaking capacity of the circuit breaker.

[0003] The two moving contacts of the double-breaking-point circuit breaker in the prior art are both single-breaking-point moving contacts. The opening distances of the two moving contacts are the same, and the opening directions of the two moving contacts are the same or the components of the opening directions occupy the same space. The moving contacts are not reasonably arranged using different spatial orientations, resulting in a small opening distance of the moving contacts, limited arrangement quantity of the corresponding arc extinguishing grid sheets, and the moving contacts are only repelled under the action of the reverse current electrodynamic repulsion force in one section, with a slow repulsion speed; for the double-breaking-point circuit breaker with repellable contacts in the prior art, as the electrodynamic repulsion force decreases during the breaking process, it will cause the repellable contacts to reset and connect again after being repelled, posing risks of contact burnout and breaking failure. Moreover, there is no electrodynamic force on the repellable contacts in the open state, and the repellable contacts can only be kept in the connected state. At this time, only one breaking point maintains the isolation function of the circuit breaker. With the development of new energy low-voltage electrical appliances, the rated voltage has reached more than 1000V, and the short-circuit current also exceeds 50kA. Therefore, the circuit breaker is required to have a faster contact breaking speed, a larger contact opening distance, and a larger number of arc extinguishing grid sheets arranged.

[0004] In view of this, it is indeed necessary to propose a double-breaking-point electrical circuit breaker with a new structure to solve the above problems. Summary of the Invention

[0005] Based on the above background, the present application provides a double-breaking-point circuit breaker, which solves the problems of short length and few grid sheets of the arc extinguishing chamber, and solves the problems of sequential breaking caused by small and different opening distances and slow repulsion and reset connection of the repellable contacts in the existing similar products, resulting in virtual connection and burnout. The double-breaking-point circuit breaker of the present application has the characteristics of high voltage breaking, high current limiting ability, and good ability to break extremely large currents.

[0006] The technical solution of the present invention is as follows:

[0007] A circuit breaker includes a housing and internal components. The internal components at least include an upper arc extinguishing chamber, a lower arc extinguishing chamber, a double-break contact system, a first terminal, a second terminal, an overload release, a mechanism, and a rotating shaft. The double-break contact system includes a single-break moving contact, a double-break moving contact, and a static contact. It is characterized in that: the mechanism drives at least one rotating shaft, the double-break contact system is arranged between the upper arc extinguishing chamber and the lower arc extinguishing chamber, and the single-break moving contact and the double-break moving contact are driven by two rotating shafts respectively.

[0008] In the above embodiment, by arranging a mechanism to drive two rotating shafts at the same time, the two rotating shafts then drive the single-break moving contact and the double-break moving contact to move to realize the opening and closing of the two breaks. The contact opening distance is large, and the isolation performance is good, and it can break the high short-circuit current under high voltage.

[0009] In the above embodiment, one end of the double-break moving contact and one end of the static contact are U-shaped when in contact and the flowing current directions are opposite, and the other end of the double-break moving contact and one end of the single-break moving contact are U-shaped when in contact and the flowing current directions are opposite.

[0010] In some embodiments, the double-break moving contact is arranged between the static contact and the single-break moving contact.

[0011] In some embodiments, the double-break moving contact is provided with a first contact portion, a second contact portion, and a rotation center fulcrum.

[0012] In some embodiments, the contact portion of the single-break moving contact and the first contact portion can be in contact and cooperate to apply a pressure F1 in a first direction to the first contact portion, the second contact portion and the contact portion of the static contact can be in contact and cooperate to apply a pressure F2 in a second direction to the contact portion of the static contact, the pressure F1 and the pressure F2 are on different sides of the rotation center fulcrum, and the pressure received by the first contact portion acts on the second contact portion in the form of torque to form a pressure on the static contact.

[0013] In the above embodiment, the torque generated by the pressure of the single-break moving contact on the double-break moving contact is converted into a pressure on the static contact, so that the final pressure received by the contact portion of the static contact increases, the contact resistance increases, and the temperature rise decreases.

[0014] In some embodiments, the first contact portion and the contact portion of the single-break moving contact are in contact or separated, and an upper break is formed when separated; the second contact portion and the contact portion of the static contact are in contact or separated to form a lower break.

[0015] In some embodiments, the opening directions of the upper break and the lower break are different.

[0016] In some embodiments, one end of the static contact is connected to the first terminal or the second terminal.

[0017] In some embodiments, the two rotating shafts are driven by the same mechanism.

[0018] In some embodiments, when the double-break contact system breaks the current, the upper arc extinguishing chamber and the lower arc extinguishing chamber form a series circuit.

[0019] In some embodiments, the lower arc extinguishing chamber is arranged below the mechanism, and the upper arc extinguishing chamber and the lower arc extinguishing chamber are insulated from the mechanism.

[0020] In some embodiments, the upper arc extinguishing chamber and the lower arc extinguishing chamber are arranged in at least two directions;

[0021] In some embodiments, the arc movement directions of the single-break moving contact and the double-break moving contact are different.

[0022] In some embodiments, the mechanism includes an upper connecting rod, a lower connecting rod and an auxiliary connecting rod. The two rotating shafts include a first rotating shaft and a second rotating shaft. The upper connecting rod, the lower connecting rod and the auxiliary connecting rod are hinged in sequence. The first rotating shaft is hinged to one ends of the lower connecting rod and the auxiliary connecting rod, and the second rotating shaft is hinged to the other end of the auxiliary connecting rod.

[0023] In some embodiments, when the mechanism is tripped, the two breakpoints of the double-break contact system remain in the open state simultaneously.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. When the circuit breaker of the present application breaks and is manually tripped, the mechanism drives the two rotating shafts to move together so that the two breakpoints remain open simultaneously, with a large opening distance and good isolation performance.

[0026] 2. Arc extinguishing chambers are respectively arranged at the two breakpoints of the double-break contact system of the present application, improving the arc extinguishing ability and breaking ability of the circuit breaker.

[0027] 3. The double-break moving contact of the present application forms a U-shaped repulsive force structure with two opposite current directions, with a greater repulsive force, a faster repulsive speed of the double-break moving contact, and a higher breaking ability.

[0028] 4. The torque generated by the pressure of the single-break moving contact on the double-break moving contact of the present application is converted into the pressure on the static contact, increasing the final pressure received by the contact part of the static contact, reducing the contact resistance, lowering the temperature rise, and avoiding the problem of burnout caused by poor contact between the double-break moving contact and the static contact.

[0029] 5. The opening directions of the upper breaking point and the lower breaking point of this application are set in different directions, and the corresponding upper arc extinguishing chamber and lower arc extinguishing chamber are also set in different directions. By reasonably utilizing different directions, the opening distances of the upper breaking point and the lower breaking point are larger than those of existing circuit breakers, and the number of arranged arc extinguishing grids is more than that of existing circuit breakers. The arc is rapidly stretched in the state of large opening distance and enters more arc extinguishing chambers of the arc extinguishing grids, increasing the arc resistance, thereby establishing a very high arc voltage. The arc is extinguished through deionization. The larger opening distance and the larger number of arc extinguishing grids can break high short-circuit currents under high voltages. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments recorded in this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Internal structure schematic diagram of the circuit breaker of this application in the closed state;

[0032] Figure 2 Internal structure schematic diagram of the circuit breaker of this application in the open state;

[0033] Figure 3 Schematic diagram of the double-breaking point system structure of the circuit breaker of this application;

[0034] Figure 4 Schematic diagram of the three-dimensional structure of the double-breaking point system of the circuit breaker of this application;

[0035] Figure 5 Schematic diagram of the force condition of the double-breaking point system of the circuit breaker of this application;

[0036] Figure 6 Schematic diagram of the second force condition of the double-breaking point system of the circuit breaker of this application;

[0037] Figure 7 Explosion schematic diagram of the double-breaking point system of the circuit breaker of this application

[0038] Figure 8 Schematic diagram of the structure of the moving contact of the double-breaking point of the circuit breaker of this application;

[0039] Figure 9 Schematic diagram of the structure of the moving contact of the single-breaking point of the circuit breaker of this application;

[0040] Figure 10 Schematic diagram of the structure of the static contact of the circuit breaker of this application. Detailed Embodiments

[0041] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely provided to better understand the present invention by showing examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but covers any modification, replacement, and improvement of elements, components, and algorithms without departing from the spirit of the present invention. In the drawings and the following description, well-known structures and technologies are not shown so as not to unnecessarily obscure the present invention.

[0042] In the description of the embodiments of the present disclosure, the term "comprising" and its like terms should be understood as an open inclusion, that is, "including but not limited to". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc. may refer to different or the same objects. There may also be other explicit and implicit definitions hereinafter.

[0043] Circuit breakers can be divided into single-break circuit breakers and double-break circuit breakers according to the number of breaking points. In the prior art, the moving contact and the static contact of a double-break circuit breaker only form a set of contacts. The moving contact has only one reverse current segment, and the moving contact is only repelled by a single electro-dynamic repulsive force, resulting in a slow repelling speed and a poor current-limiting effect during breaking; in the prior art, for a double-break circuit breaker with a repellable contact, as the current decreases and the distance between the contacts increases during the breaking process, the electro-dynamic repulsive force decreases, which may cause the repellable contact to reset and close after being repelled. If the short-circuit current is not limited to the normal current value after the reset and closing, the arc will reignite, resulting in contact burnout and breaking failure. Even during opening, without the drive of a mechanism, the repellable contact can only remain in the closed state. At this time, only one breaking point maintains the isolation function of the circuit breaker, and the isolation performance of the circuit breaker is poor.

[0044] Please refer to Figures 1 to 10, this application discloses a circuit breaker, which includes a housing 2 and internal components. The internal components at least include an upper arc extinguishing chamber 30, a lower arc extinguishing chamber 40, a double-break contact system 10, a first terminal 50, a second terminal 60, an overload release 70, a mechanism 20, and a rotating shaft 13. The double-break contact system 10 includes a single-break moving contact 111, a double-break moving contact 112, and a static contact 12. The mechanism 20 drives at least one rotating shaft 13. The double-break contact system 10 is arranged between the upper arc extinguishing chamber 30 and the lower arc extinguishing chamber 40. The lower arc extinguishing chamber 40 is arranged below the mechanism 20. The upper arc extinguishing chamber 30 and the lower arc extinguishing chamber 40 are insulated from the mechanism 20. The upper arc extinguishing chamber 30 and the lower arc extinguishing chamber 40 are arranged in at least two directions. The single-break moving contact 111 and the double-break moving contact 112 are respectively driven by two rotating shafts 13. The arc movement directions of the single-break moving contact 111 and the double-break moving contact 112 are different. Among them, the arc of the single-break moving contact moves in the vertical direction, and the arc of the double-break moving contact moves in the horizontal direction. One end of the double-break moving contact 112 is U-shaped when contacting one end of the static contact 12, and the flowing current directions are opposite. The other end of the double-break moving contact 112 is U-shaped when contacting one end of the single-break moving contact 111, and the flowing current directions are opposite.

[0045] The rotating shaft 13 includes a first rotating shaft 131 and a second rotating shaft 132. The single-break moving contact 111 is arranged on the first rotating shaft 131, and the double-break moving contact 112 is arranged on the second rotating shaft 132. That is, the double-break contact system 10 is respectively driven by two rotating shafts 13. One end of the static contact 12 is connected to the first terminal 50, and the single-break moving contact 111 is directly or indirectly connected to the second terminal 60.

[0046] The mechanism 20 includes an upper connecting rod 21, a lower connecting rod 22, and an auxiliary connecting rod 23. The upper connecting rod 21, the lower connecting rod 22, and the auxiliary connecting rod 23 are sequentially hinged. The first rotating shaft 131 is hinged to one end of the lower connecting rod 22 and one end of the auxiliary connecting rod 23. The second rotating shaft 132 is hinged to the other end of the auxiliary connecting rod 23. When the mechanism 20 performs a driving operation, the upper connecting rod 21 serves as a driving part to drive the lower connecting rod 22 to move. The lower connecting rod 22 then drives the first rotating shaft 131 to move. The first rotating shaft 131 drives the auxiliary connecting rod 23 to move. The auxiliary connecting rod 23 then drives the second rotating shaft 132 to move. Through the linkage drive control of the mechanism 20, the two breakpoints of the double-break contact system 10 are synchronously or non-synchronously contacted and separated. This linkage drive has a high synchronization of the two breakpoints, balanced energy carried during breaking, and good breaking effect. During opening, the two breakpoints of the double-break contact system 10 can be simultaneously kept in the open state under the drive of the mechanism 20, maintaining the double breakpoints and large opening distance of the circuit breaker, and improving the breaking performance and isolation performance.

[0047] Please refer to Figure 3 、 Figure 4 and Figure 7 , the double-break contact system 10 has two breakpoints. The double-break moving contact 112 is arranged between the static contact 12 and the single-break moving contact 111. The double-break moving contact 112 is provided with a first contact portion 1121, a second contact portion 1123 and a rotation center fulcrum 1122. The first contact portion 1121 and the second contact portion 1123 rotate around the rotation center fulcrum 1122 to realize the contact and separation of the contact portions. The first contact portion 1121 contacts or separates from the contact portion 1111 of the single-break moving contact 111. When separated, an upper breakpoint 1124 is formed. The second contact portion 1123 contacts or separates from the contact portion 121 of the static contact 12 to form a lower breakpoint 1125. The opening directions of the upper breakpoint 1124 and the lower breakpoint 1125 are different. When contacting, the circuit breaker is turned on. When separated, the circuit breaker is turned off. The structural form of the upper breakpoint 1124 is similar to that of a single-break circuit breaker, inheriting the advantage of the large opening distance of the breakpoint of the single-break circuit breaker and improving the breaking and current-limiting ability.

[0048] In this embodiment, the single-break moving contact 111 and the double-break moving contact 112 are arranged in series. The mechanism 20 drives the two rotating shafts 13 to move, thereby driving the single-break moving contact 111 and the double-break moving contact 112 to move simultaneously to realize the contact or separation of the two breakpoints. When the circuit breaker is turned on, the current flows from the first terminal 50 to the static contact 12, then through the double-break moving contact 112, then to the single-break moving contact 111, then to the overload release 70, and finally to the second terminal 60. Here, it should be noted that the single-break moving contact 111 and the first rotating shaft 131 can be relatively stationary or movably arranged. Similarly, the double-break moving contact 112 and the second rotating shaft 132 can also be relatively stationary or movably arranged.

[0049] Please refer to Figure 5 , the contact portion 1111 of the single-break moving contact 111 can be in contact and cooperate with the first contact portion 1121 and apply a pressure F1 in the first direction to the first contact portion 1121. The second contact portion 1123 can be in contact and cooperate with the contact portion 121 of the static contact 12 and apply a pressure F2 in the second direction to the contact portion 121 of the static contact 12. The pressure F1 and the pressure F2 are on different sides of the rotation center fulcrum 1122. The pressure received by the first contact portion 1121 acts on the second contact portion 1123 in the form of torque to form a pressure on the static contact 12.

[0050] Please refer to Figure 6, in some embodiments, the direction of the pressure F1 applied by the contact portion 1111 of the single-break moving contact 111 to the first contact portion 1121 and in contact cooperation with the first contact portion 1121 may also pass through the rotation center pivot point 1122. The pressure received by the first contact portion 1121 is not transferred to the static contact 12, and the pressure F1 does not affect the contact cooperation between the second contact portion 1123 and the contact portion 121 of the static contact and the application of the pressure F2 in the second direction to the contact portion 121 of the static contact.

[0051] Please continue to refer to Figure 1 and Figure 2 , when the circuit breaker performs a tripping operation, the mechanism 20 drives the two rotating shafts 13 to move, thereby driving the single-break moving contact 111 and the double-break moving contact 112 to move simultaneously, so that the two breakpoints of the double-break contact system 10 change from the contact state to the separated state, and the circuit breaker changes from the closed state to the open state. When a short-circuit current passes through, a U-shaped reverse current structure is formed by the contact between one end of the double-break moving contact 112 and one end of the static contact 12, generating an electro-dynamic repulsive force on the double-break moving contact 112. A U-shaped reverse current structure is formed by the contact between the other end of the double-break moving contact 112 and one end of the single-break moving contact 111, causing an electro-dynamic repulsive force between the double-break moving contact 112 and the single-break moving contact 111. The single-break moving contact 111 is repelled by the electro-dynamic repulsive force of the double-break moving contact 112, and the double-break moving contact 112 is simultaneously repelled by the electro-dynamic repulsive force of the static contact 12 and the electro-dynamic repulsive force of the single-break moving contact 111. The double-break moving contact 112 is repelled at a faster speed and has a higher breaking capacity compared to the moving contact that only receives one electro-dynamic repulsive force in the prior art. At the same time, the mechanism 20 drives the two rotating shafts 13 to move, separating the two breakpoints of the double-break contact system 10. An arc is generated between the separated two breakpoints. As the opening distance continuously increases, the arc is stretched and enters the arc extinguishing chamber. The upper arc extinguishing chamber 30 and the lower arc extinguishing chamber 40 are connected in series to the circuit through the arc. The two breakpoints cooperate with the upper arc extinguishing chamber 30 and the lower arc extinguishing chamber 40 to jointly share the voltage and bear the breaking energy, improving the breaking capacity.

[0052] The present invention may be implemented in other specific forms without departing from its spirit and essential features. The current embodiments are regarded as exemplary in all aspects rather than restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and all changes falling within the meaning and equivalents of the claims are thus included in the scope of the present invention.

Claims

1. A circuit breaker, comprising a housing and internal components, said internal components at least including an upper arc extinguishing chamber, a lower arc extinguishing chamber, a double-break contact system, a first terminal, a second terminal, an overload release, a mechanism, and a rotating shaft, said double-break contact system including a single-break moving contact, a double-break moving contact, and a static contact, characterized in that: The mechanism drives at least one rotating shaft. The double-break contact system is arranged between the upper arc extinguishing chamber and the lower arc extinguishing chamber. The single-break moving contact and the double-break moving contact are driven by two rotating shafts respectively.

2. The circuit breaker according to claim 1, characterized in that: One end of the double-break moving contact and one end of the static contact are U-shaped when in contact and the flowing current directions are opposite. The other end of the double-break moving contact and one end of the single-break moving contact are U-shaped when in contact and the flowing current directions are opposite.

3. The circuit breaker according to claim 1, characterized in that: The double-break moving contact is arranged between the static contact and the single-break moving contact.

4. The circuit breaker according to claim 2, characterized in that: The double-break moving contact is provided with a first contact part, a second contact part and a rotation center fulcrum.

5. The circuit breaker according to claim 3, characterized in that: The contact part of the single-break moving contact can be in contact and cooperate with the first contact part and apply a pressure F1 in a first direction to the first contact part. The second contact part can be in contact and cooperate with the contact part of the static contact and apply a pressure F2 in a second direction to the contact part of the static contact. The pressure F1 and the pressure F2 are on different sides of the rotation center fulcrum. The pressure received by the first contact part acts on the second contact part in the form of torque to form a pressure on the static contact.

6. The circuit breaker according to claim 4, characterized in that: The first contact part contacts or separates from the contact part of the single-break moving contact. When separated, an upper break point is formed. The second contact part contacts or separates from the contact part of the static contact to form a lower break point.

7. The circuit breaker according to claim 6, characterized in that: The opening directions of the upper break point and the lower break point are different.

8. The circuit breaker according to claim 1, characterized in that: One end of the static contact is connected to the first wiring terminal or the second wiring terminal.

9. The circuit breaker according to claim 1, characterized in that: The two rotating shafts are driven by the same mechanism.

10. The circuit breaker according to claim 1, characterized in that: When the double-break contact system breaks and generates current, the upper arc extinguishing chamber and the lower arc extinguishing chamber form a series circuit.

11. The circuit breaker according to claim 1, characterized in that: The lower arc extinguishing chamber is arranged below the mechanism. The upper arc extinguishing chamber and the lower arc extinguishing chamber are insulated from the mechanism.

12. The circuit breaker according to claim 1, characterized in that: The upper arc extinguishing chamber and the lower arc extinguishing chamber are arranged in at least two directions.

13. The circuit breaker according to claim 1, characterized in that: The arc movement directions of the single-break moving contact and the double-break moving contact are different.

14. The circuit breaker according to claim 1, characterized in that: The mechanism includes an upper connecting rod, a lower connecting rod and an auxiliary connecting rod. The two rotating shafts include a first rotating shaft and a second rotating shaft. The upper connecting rod, the lower connecting rod and the auxiliary connecting rod are hinged in sequence. The first rotating shaft is hinged to one ends of the lower connecting rod and the auxiliary connecting rod. The second rotating shaft is hinged to the other end of the auxiliary connecting rod.

15. The circuit breaker according to claim 1, characterized in that: When the mechanism opens, the two break points of the double-break contact system remain in the open state simultaneously.

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